WO2025066877A1 - Power tool - Google Patents

Abstract

A power tool, comprising: a cylinder, which is at least partially arranged in a housing. Gas is stored in the cylinder. The cylinder comprises: an inflation nozzle, through which the cylinder is pre-filled with gas; an inflating valve, through which the gas filled by the inflation nozzle flows and then enters the cylinder; and a pressure relief valve, which is arranged between the inflation nozzle and the inflation valve. When the pressure of the gas filled by the inflation nozzle is greater than a first preset pressure, the filled gas is released through the pressure relief valve.

Description

Power Tools

This application claims the priority of the Chinese patent application filed with the China Patent Office on September 27, 2023 with application number 202311267443.2, the priority of the Chinese patent application filed with the China Patent Office on September 27, 2023 with application number 202311261298.7, the priority of the Chinese patent application filed with the China Patent Office on September 27, 2023 with application number 202311257589.9, the priority of the Chinese patent application filed with the China Patent Office on September 27, 2023 with application number 202322645843.4, and the priority of the Chinese patent application filed with the China Patent Office on September 27, 2023 with application number 202322645506.5. The entire contents of the above applications are incorporated by reference into this application.

Technical Field

The present application relates to a tool, for example, to a power tool with a cylinder.

Background Art

The nail gun in the related technology is a nailing tool. The principles of nail gun products on the market can be divided into mechanical and cylinder types. Among them, mechanical nail guns can be divided into spring type, flywheel type, friction wheel type and other structures according to the energy storage method; cylinder nail guns can be divided into single-cylinder or double-cylinder structures according to the number of cylinders, and can be divided into positive pressure or negative pressure energy storage according to the energy storage method.

In the related art, the cylinder nail gun compresses the gas in the cylinder, and the gas pushes out the firing assembly to perform nailing. The pre-filled nail gun pre-fills the gas through the filling nozzle and does not require an external air pressure source. During the filling process, the cylinder, the filling nozzle and the components in the cylinder are easily damaged by excessive filling pressure.

This section provides background information related to the present application which is not necessarily prior art.

Summary of the invention

One object of the present application is to solve or at least alleviate part or all of the above problems. To this end, one object of the present application is to provide a power tool that can protect cylinder components.

In order to achieve the above objectives, this application adopts the following technical solutions:

In a first aspect, an embodiment of the present application provides a power tool, comprising: a housing; a power output unit, at least partially disposed in the housing; a cylinder, at least partially disposed in the housing; gas stored in the cylinder; a piston, driven by the power output unit, the piston being disposed in the cylinder and moving in the cylinder to compress the gas in the cylinder; wherein the cylinder comprises: an inflation nozzle, the cylinder is pre-filled with gas through the inflation nozzle; an inflation valve, the gas filled in the inflation nozzle flows through the inflation valve and then enters the cylinder; a pressure relief valve, disposed between the inflation nozzle and the inflation valve, when the pressure of the gas filled in the inflation nozzle is greater than a first preset pressure, the filled gas is released through the pressure relief valve.

In some embodiments, the pressure relief valve is unidirectional.

In some embodiments, the inflation valve is unidirectional.

In some embodiments, the inflation valve restricts gas within the cylinder from flowing out of the cylinder through the inflation valve.

In some embodiments, the inflation valve restricts gas from entering the cylinder when the pressure in the cylinder exceeds a second preset pressure.

In some embodiments, the first preset pressure is less than or equal to the second preset pressure.

In some embodiments, the cylinder includes: a cylinder portion, which is provided with a cavity, and the cavity is configured to store gas; and an inflation portion, which is connected to the cavity via an inflation valve.

In some embodiments, the inflation portion includes a gas channel portion, the inflation nozzle and the inflation valve are arranged at two ends of the gas channel portion, and the pressure relief valve is arranged on the gas channel portion.

In some embodiments, when the pressure relief valve and the inflation valve are in a closed state, the gas pressure in the gas channel is greater than or equal to the atmospheric pressure.

In some embodiments, the gas channel portion forms a second gas cavity, the second gas cavity has a certain length, and the pressure relief valve releases gas along a direction intersecting with the length direction of the second gas cavity.

In some embodiments, the cylinder includes an inner cylinder within which the piston moves.

In some embodiments, the cylinder further comprises an outer cylinder arranged around the inner cylinder, the inner cylinder and the outer cylinder are connected, and the inflation nozzle, the inflation valve and the pressure relief valve are respectively arranged on the outer cylinder.

In some embodiments, the outer side wall of the inner cylinder is provided with a first thread segment and the inner side wall of the outer cylinder is provided with a second thread segment, and the first thread segment is meshed with the second thread segment.

In some embodiments, the shell includes an inflation hole corresponding to the inflation nozzle; it also includes a retaining member configured to fix the cylinder, the retaining member includes a positioning portion, the positioning portion is at least partially disposed on the cylinder, and the positioning portion indicates the position where the inflation nozzle and the inflation hole are assembled.

In some embodiments, the positioning portion includes a first indication structure, and a second indication structure is provided on the cylinder. When the first indication structure and the second indication structure satisfy a preset relationship, the cylinder is fixed at a preset position so that the inflation nozzle corresponds to the inflation hole.

On the second aspect, an embodiment of the present application provides a power tool, including: a housing; a power output unit, at least partially disposed in the housing; a cylinder, at least partially disposed in the housing; gas stored in the cylinder; a piston, driven by the power output unit, the piston being disposed in the cylinder and moving in the cylinder to compress the gas in the cylinder; an inflation nozzle, the cylinder being pre-filled with gas through the inflation nozzle; a one-way pressure relief valve, disposed on the inflation downstream side of the inflation nozzle, and a one-way hydraulic valve conducting the escaping gas to the outside of the cylinder.

In a third aspect, an embodiment of the present application provides a power tool, comprising: a housing; a power output portion, at least partially disposed in the housing; a cylinder, at least partially disposed in the housing; gas is stored in the cylinder; The piston is driven by the power output part, and the piston is arranged in the cylinder and moves in the cylinder to compress the gas in the cylinder; the cylinder includes: an inflation nozzle, and the cylinder is pre-filled with gas through the inflation nozzle; the inflation nozzle limits the release of gas from the inflation nozzle; a one-way pressure relief valve is arranged on the inflation downstream side of the inflation nozzle, and when the pressure of the inflation gas of the inflation nozzle is greater than the first preset pressure, the inflation gas is released through the one-way pressure relief valve.

In some embodiments, the cylinder includes: an inner cylinder, and the piston moves in the inner cylinder.

In some embodiments, the cylinder further comprises an outer cylinder arranged around the inner cylinder, the inner cylinder and the outer cylinder are connected, and the inflation nozzle and the one-way pressure relief valve are respectively arranged on the outer cylinder.

In some embodiments, the outer side wall of the inner cylinder is provided with a first thread segment and the inner side wall of the outer cylinder is provided with a second thread segment, and the first thread segment is meshed with the second thread segment.

In a fourth aspect, an embodiment of the present application provides a power tool, comprising: a housing; a motor, at least partially disposed in the housing; a circuit board assembly, electrically connected to the motor to control the motor; the circuit board assembly comprising a first heat dissipation portion, the first heat dissipation portion being at least partially in thermal contact with a circuit board provided with a controller; a second heat dissipation portion, disposed outside the circuit board assembly, the second heat dissipation portion comprising a core portion and an outer shell portion having heat dissipation capability; the core portion at least comprising a phase change material; a heat conductive portion, connecting the circuit board assembly and the second heat dissipation portion so that the circuit board assembly and the second heat dissipation portion are in thermal contact.

In some embodiments, the core undergoes a phase change reaction at a preset temperature to cool the shell.

In some embodiments, the preset temperature is lower than the temperature of the first heat dissipation portion.

In some embodiments, the housing portion includes a metallic material.

In some embodiments, the outer shell forms an openable and closable sealed cavity, and the core is accommodated in the sealed cavity.

In some embodiments, the thermally conductive portion includes a metal material.

In some embodiments, the heat conducting portion connects the first heat dissipating portion and the outer shell portion.

In some embodiments, the first heat dissipation portion includes a fin heat dissipation structure.

In some embodiments, the first heat dissipation portion includes at least a phase change material.

In the fifth aspect, an embodiment of the present application provides a power tool, comprising: a shell; a heat generating component, which is at least partially arranged in the shell; the heat generating component generates a temperature rise when the power tool is running; a first heat dissipation part, which is at least partially in thermal contact with the heat generating component; a second heat dissipation part, which is arranged outside the heat generating component, and the second heat dissipation part includes a core part and an outer shell part with heat dissipation capability; the core part includes at least phase change material; a heat conducting part, which connects the heat generating component and at least one of the first heat dissipation part and the second heat dissipation part to bring the heat generating component and the second heat dissipation part into thermal contact.

In a sixth aspect, an embodiment of the present application provides a power tool, comprising: a housing; a power output portion, at least partially disposed in the housing; a cylinder, at least partially disposed in the housing; gas is stored in the cylinder; A piston is arranged in a cylinder and is driven by a power output part and moves in the cylinder to compress the gas in the cylinder; the cylinder comprises: a first cavity, in which the piston moves; a second cavity, in which the second cavity is connected to the first cavity; an adjusting component, the adjusting component comprises a first state and a second state, when the position of the piston in the first cavity is the same, when the adjusting component is in the first state, the first cavity and the second cavity define a first effective volume; when the adjusting component is in the second state, the first cavity and the second cavity define a second effective volume; the first effective volume is smaller than the second effective volume.

In some embodiments, the defined volume of the first cavity is related to the travel position of the piston.

In some embodiments, the defined volume of the first cavity is independent of the state of the regulating assembly.

In some embodiments, the adjustment assembly is at least partially disposed within the second cavity, and a defined volume of the second cavity is related to a state of the adjustment assembly.

In some embodiments, the adjustment component includes: an operating member driven to switch the working state of the adjustment component; and an adjustment piston driven by the operating member to move in the second cavity.

In some embodiments, the adjusting piston and the inner wall of the second cavity define the volume of the second cavity.

In some embodiments, the adjustment assembly further includes a connecting portion, which connects the operating member and the adjustment piston, and the connecting portion is driven by the operating member to move the adjustment piston and maintains the position of the adjustment piston when the operating member is released.

In some embodiments, a sealing ring is disposed on the outer side of the regulating piston.

In some embodiments, the power tool further includes: a firing pin disposed on the piston, the firing pin being configured to drive a nail; and a driving member driven by the power output portion to cooperate with the firing pin to drive the piston to move in the cylinder and compress the gas.

In the seventh aspect, an embodiment of the present application provides a power tool, comprising: a shell; a power output part, at least partially arranged in the shell; a cylinder, at least partially arranged in the shell; gas is stored in the cylinder; a firing assembly, at least partially arranged in the cylinder, capable of moving from an energy storage position to a firing position in the cylinder to drive a nail; the cylinder comprises: a first cavity, the firing assembly moves in the first cavity; a second cavity, the second cavity is connected to the first cavity; an adjusting assembly, the adjusting assembly comprises a first state and a second state, when the same volume of gas is filled in the cylinder, the striking force applied by the firing assembly to the nail when the adjusting assembly is in the first state is greater than the striking force applied by the firing assembly to the nail when the adjusting assembly is in the second state.

In an eighth aspect, an embodiment of the present application provides a power tool, comprising: a housing; a power output unit, at least partially disposed in the housing; a cylinder, at least partially disposed in the housing; gas stored in the cylinder; a piston, disposed in the cylinder, driven by the power output unit and moving in the cylinder to compress the gas in the cylinder; an inflation nozzle, the cylinder is pre-filled with gas through the inflation nozzle; the housing includes an inflation hole corresponding to the inflation nozzle; a retaining member, configured to fix the cylinder; the retaining member includes a positioning portion, the positioning portion includes a first indication structure, and a second indication structure is provided on the cylinder. When the first indication structure and the second indication structure meet a preset relationship, The cylinder is fixed at a preset position so that the inflation nozzle corresponds to the inflation hole.

In some embodiments, the cylinder includes an inner cylinder in which the piston moves; and an outer cylinder disposed around the inner cylinder, the inner cylinder and the outer cylinder are in communication, and a retaining member connects the inner cylinder and the outer cylinder.

In some embodiments, the inner cylinder is connected to the outer cylinder by rotation, and the positioning portion indicates the rotation end point of the outer cylinder.

In some embodiments, the retaining member includes a first thread segment disposed on an outer side wall of the inner cylinder and a second thread segment disposed on an inner side wall of the outer cylinder, the first thread segment being meshed with the second thread segment.

In some embodiments, the retaining member further comprises a retaining ring disposed on the outside of the outer cylinder, the retaining ring limiting the engagement and loosening of the first thread segment and the second thread segment.

In some embodiments, the first indicator structure is formed on or attached to the retaining ring.

In some embodiments, the retaining member further comprises a support seat, which is fixed to the inner cylinder and positions the inner cylinder and the housing.

In some embodiments, the first indication structure is formed on or connected to the support base.

In some embodiments, it also includes a firing pin, which is arranged on the piston and is configured to drive out a nail, and the firing pin extends out of the cylinder; and a dustproof part, which is arranged at the position where the firing pin extends out of the cylinder to limit dust on the firing pin from entering the cylinder.

In the ninth aspect, an embodiment of the present application provides a power tool, comprising: a housing; a power output portion, at least partially disposed in the housing; a cylinder, at least partially disposed in the housing; gas stored in the cylinder; a piston, disposed in the cylinder, driven by the power output portion and moving in the cylinder to compress the gas in the cylinder; an inflation nozzle, the cylinder being pre-filled with gas through the inflation nozzle; the housing comprising an inflation hole corresponding to the inflation nozzle; a retaining member, configured to fix the cylinder; the retaining member comprising a positioning portion, the positioning portion being at least partially disposed on the cylinder, the positioning portion indicating the position at which the inflation nozzle and the inflation hole are assembled.

In the tenth aspect, an embodiment of the present application provides a nail gun, comprising: a shell; a power output part, at least partially disposed in the shell; a firing assembly, which moves from an energy storage position to a firing position to drive a nail; the firing assembly comprises a first lifting part; a driving member, which is driven by the power output part; the driving member is configured to drive the firing assembly so that the firing assembly moves from the firing position to the energy storage position; the driving member comprises a first driving part, the first driving part is engaged with the first lifting part to make the firing assembly move from the firing position to the energy storage position; the first driving part comprises: a first avoidance part configured to avoid the second lifting part below the first lifting part.

In some embodiments, the firing assembly further includes: a third lifting portion, the third lifting portion is provided with a first rotating shaft, the first rotating shaft is provided with a roller, and the roller rotates around the first rotating axis.

In some embodiments, the radius of the roller is greater than or equal to the length of a connecting line between the tooth top of the third lifting portion and the axis of the first rotating shaft.

In some embodiments, the width of the first lifting portion is greater than the width of the first avoiding portion, and the width of the second lifting portion is less than or equal to the width of the first avoiding portion.

In some embodiments, a second rotating shaft is disposed on the first lifting portion, a roller is disposed on the second rotating shaft, and the roller rotates around the second rotating axis.

In some embodiments, the driving member further includes a second driving portion, the second driving portion is engaged with a second lifting portion below the first lifting portion, and a width of the second driving portion is substantially the same as a width of the first driving portion.

In some embodiments, the driving member includes a third driving portion cooperating with the third lifting portion, and the wall surface of the third driving portion contacting the roller is a smooth surface.

In some embodiments, the nail gun also includes: a cylinder, configured to store gas; the firing assembly includes: a piston, located in the cylinder; a firing pin, arranged on the piston; a first lifting part, a second lifting part and a third lifting part are arranged on the firing pin to enable the piston to move in the cylinder.

In some embodiments, the first lifting portion, the second lifting portion and the third lifting portion are arranged in sequence from near to far from the piston.

In some embodiments, the first avoidance portion is configured to allow the second lifting portion to pass through or over the first driving portion along the moving direction of the firing assembly.

In some embodiments, the first avoidance portion is configured as a groove on the first driving portion extending along the moving direction of the firing assembly.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a three-dimensional structural diagram of a nail gun according to an embodiment of the present application;

FIG2 is a partial cross-sectional view of the nail gun of FIG1 ;

FIG3 is a cross-sectional view of a portion of FIG1 showing the motor, transmission and fan assembly;

FIG4 is a cross-sectional view of the parts of FIG1 showing the cylinder and the firing assembly, wherein the firing assembly is in a firing position;

FIG5 is a cross-sectional view of the parts of FIG1, showing the cylinder and the firing assembly, wherein the firing assembly is in a charged position;

FIG6 is a three-dimensional structural diagram of some components in FIG1 , showing a power output unit and a firing assembly, wherein the firing assembly is in a firing position;

FIG7 is a partial cross-sectional view of FIG6;

FIG8 is a three-dimensional structural diagram of some components in FIG1 , showing a power output unit and a firing assembly, wherein the firing assembly is in an energy storage position;

FIG9 is a schematic diagram of the structure of the driving member and the striker in FIG6;

FIG. 10 is a cross-sectional view taken along line B-B in FIG. 9

FIG11 is an enlarged cross-sectional view of some components in FIG4;

FIG12 is an exploded view of some components of FIG11;

FIG13 is a schematic diagram of another cylinder structure;

FIG14 is a schematic diagram of another cylinder structure and another inflation nozzle structure;

FIG15 is a schematic structural diagram of some components of FIG2 from another perspective;

FIG16 is a partial enlarged view of part I in FIG4;

17 is a partial cross-sectional view of the cylinder portion of a nail gun in an embodiment of the present application, showing the dustproof structure;

18 is a partial cross-sectional view of another portion of the cylinder of a nail gun in an embodiment of the present application, showing a lubrication compensation assembly;

19 is a partial cross-sectional view of a nail gun according to an embodiment of the present application, showing a circuit board assembly and a second heat sink;

FIG20 is a structural diagram of some components in FIG19 from another perspective;

21 is a partial cross-sectional view of a cylinder portion of a nail gun according to another embodiment of the present application, wherein the adjustment assembly is in a second state;

22 is a partial cross-sectional view of a cylinder portion of a nail gun according to another embodiment of the present application, wherein the adjustment assembly is in a first state;

FIG23 is a partial perspective view of a cylinder portion of a nail gun according to another embodiment of the present application;

FIG. 24 is a schematic diagram of an electrical structure diagram of any one embodiment of the present application.

DETAILED DESCRIPTION

Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above drawings.

In this application, the terms "comprises", "includes", "has" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

In this application, the term "and/or" is a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character "/" in this application generally indicates that the related objects before and after are in an "and/or" relationship.

In the present application, the terms "connect", "combine", "couple", and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, direct connection refers to two parts or components being connected together without the need for an intermediate piece, and indirect connection refers to two parts or components being connected to at least one intermediate piece respectively, and the two parts or components being connected via the intermediate piece. In addition, "connect" and "couple" are not limited to physical or mechanical connections or couplings, and may include electrical connections or couplings.

In the present application, it will be understood by those of ordinary skill in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerances caused by manufacturing, assembly, and use associated with a specific value, and the like. Such terms should also be considered to disclose a range defined by the absolute values of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, %, 1% or more) of the indicated value. Numerical values that do not use relative terms should also be disclosed as specific values with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, %, 1 degree or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

In this application, it will be understood by those skilled in the art that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, the bottom can include directly below, lower left, lower right, lower front, and lower back, etc.

In this application, the terms "controller", "processor", "central processing unit", "CPU", and "MCU" are interchangeable. When a unit "controller", "processor", "central processing unit", "CPU", or "MCU" is used to perform a specific function, unless otherwise specified, these functions can be performed by a single unit or multiple units.

In the present application, the terms “device”, “module” or “unit” may be implemented in the form of hardware or software to achieve specific functions.

In this application, the terms "calculate", "judge", "control", "determine", "identify", etc. refer to the operations and processes of a computer system or similar electronic computing device (e.g., controller, processor, etc.).

In order to clearly illustrate the technical solution of the present application, an upper side, a lower side, a left side, a right side, a front side and a rear side are defined in the drawings of the specification.

As shown in Figure 1, a power tool of an embodiment of the present application is shown. In this embodiment, the power tool is a nail gun 100. In some embodiments, the power tool may also include a gas spring power tool such as a glue gun and a stapler.

As shown in FIGS. 1 and 2 , the nail gun 100 includes: a housing 11, a power output unit 12, a cylinder 13 and a clip assembly 14. The housing 11 includes a first accommodation space 11a extending along the direction of the first straight line 101 and a second accommodation space 11b extending along the direction of the second straight line 102. The power output unit 12 is disposed in the first accommodation space 11a, and the cylinder 13 is disposed in the second accommodation space 11b. The first straight line 101 intersects the second straight line 102. In this embodiment, the first straight line 101 and the second straight line 102 are substantially perpendicular to each other.

The housing 11 is also formed with a handle portion 113 for the user to hold. A power interface is connected to one end of the handle portion 113, which is configured to be connected to a DC or AC power source. In the present embodiment, the nail gun 100 is powered by a DC power source. Optionally, the DC power source is a battery pack 30, and the battery pack 30 cooperates with a corresponding power circuit to power the components in the nail gun 100. The battery pack 30 is detachably connected to the handle portion 113. Those skilled in the art should understand that the power supply is not limited to the scenario of using the battery pack 30, and can also be powered by AC power, AC power, or a mixture of AC power and battery pack 30, in conjunction with corresponding rectification, filtering and voltage regulation circuits to achieve power supply to each circuit element.

A main switch 31 is disposed on the handle portion 113 , and a user controls the start and stop of the nail gun 100 through the main switch 31 .

The clip assembly 14 is arranged in the direction of the third straight line 103. Fasteners (e.g., nails, tacks, staples, etc.) are held in the clip assembly 14 to allow the user to perform multiple fastening operations without having to manually reload the fastener driver after each drive cycle. In some embodiments, the clip assembly 14 can accommodate fasteners of multiple types or lengths.

As an optional embodiment, the clip assembly 14 is also provided with a window 141 for the user to observe the remaining nails. The window 141 is set as one or more notches on the clip assembly 14, which allows the user to check the remaining nails on the one hand, and also allows the user to perform simple maintenance on the clip assembly 14 without disassembling the clip assembly 14 on the other hand.

As shown in FIG3 , the power output unit 12 includes: a motor 121, a transmission assembly 122, an output shaft 125 and a driving member 17. In the present embodiment, the motor is specifically an electric motor 121. In the subsequent description, the motor 121 will be used to replace the motor, but it cannot be used as a limitation of the present application. Among them, the motor 121 can output power to the transmission component 122, and after the speed change of the transmission component 122, it continues to output a power to the output shaft 125, and the driving member 17 is arranged on the output shaft 125. Specifically, the motor 121, the transmission component 122, the output shaft 125 and the driving member 17 are all distributed along the direction of the first straight line 101. A speed change mechanism is arranged in the transmission component 122. In the present embodiment, the transmission component 122 includes: a first planetary gear set 1221, a second planetary gear set 1222 and a third planetary gear set 1223. In some alternative embodiments, the transmission component also includes a non-return assembly. The non-return assembly is arranged in the transmission component 122 and is arranged at one end or in the middle of the speed change mechanism. As an implementation manner, the anti-return component enables the output shaft 125 to output a driving force only along a first rotation direction, and limits the rotation of the output shaft 125 in a second rotation direction opposite to the first rotation direction.

As shown in FIGS. 4 and 5 , a firing assembly 15 is provided in the cylinder 13, and work is performed by the gas in the cylinder 13. The gas in the cylinder 13 pushes the firing assembly 15 to move, so as to drive the fasteners (e.g., nails, tacks, staples, etc.) held in the clip assembly 14 into the workpiece. In the present embodiment, the cylinder 13 further includes a gas filling nozzle 135, which is configured to pre-fill the cylinder 13 with gas.

In a nailing cycle, the power output unit 12 drives the driving member 17 to rotate and then drives the firing assembly 15 to move between the firing position (lower dead center, as shown in Figures 4, 6 and 7) and the energy storage position (upper dead center, as shown in Figures 5 and 8). By energizing the motor 121, the driving member 17 drives the firing assembly 15 from the firing position to the energy storage position, and the firing assembly 15 compresses the gas in the cylinder 13. When in the energy storage position, the firing assembly 15 and the driving member 17 are held in place, and the compressed gas continues to push the firing assembly 15 to give it an acceleration until a trigger instruction representing the user to start nailing is received, at which time the holding force of the firing assembly 15 is released. When the holding force is released, the gas compressed by the firing assembly 15 drives the firing assembly 15 to the firing position, thereby driving the nail into the workpiece.

As shown in Figures 4 to 9, the firing assembly 15 includes a firing pin 16 and a piston 151. The firing pin 16 is disposed on the piston 151. The piston 151 is disposed in the cylinder 13 and is driven by the power output unit 12 and moves in the cylinder 13 to compress the gas in the cylinder 13. The driving member 17 drives the firing pin 16 so that the piston 151 moves in the cylinder 13 along the direction of the second straight line 102, and the firing assembly 15 moves from the firing position to the energy storage position.

In this embodiment, the striker 16 is provided with a transmission tooth 16a, and the driving member 17 is provided with a driving tooth 17a that meshes with the transmission tooth 16a. In some embodiments, the striker 16 and the driving member 17 are provided with protrusions and recesses that contact and mesh with each other. Optionally, the recess can be a groove, a blind hole or a through hole structure. Optionally, the mutual cooperation structure of the striker 16 and the driving member 17 can also include a magnetic attraction structure that attracts each other and a similar structure.

When the firing assembly 15 drives out a nail, due to some reasons, the firing assembly 15 does not fully move to the firing position (lower dead center). The impact between the driving member 17 and the firing pin 16 causes the driving teeth 17a of the driving member 17 and/or the transmission teeth 16a on the firing pin 16 to be worn. Among them, "some reasons" include: the workpiece into which the nail is driven is too hard, so that the rebound force of the striking object, i.e., the nail, causes the firing assembly 15 to rebound a short distance upward from the firing position. Optionally, "some reasons" may also include: the striking force of the firing assembly 15 on the nail is insufficient, so that the nail cannot enter the workpiece with a preset length, resulting in the firing pin 16 being unable to reach the lower dead point position. At this time, if the driving member 17 and the firing pin 16 come into contact and engage, misalignment of the teeth will occur between the firing pin 16 and the driving member 17, resulting in collision or stalling. In order to solve the above problems, the present application optimizes the design of the structure of the driving member 17 and the firing pin 16, so as to avoid the wear of the driving teeth 17a and the transmission teeth 16a caused by the collision between the firing pin 16 and the driving member 17.

In the present embodiment, the driving member 17 is configured as a driving wheel with the first straight line 101 as a rotating axis. The driving member 17 includes a main body 171 surrounding the driving member 17, and the main body 171 is formed with a plurality of driving teeth 17a, and the driving teeth 17a include a first driving portion 172 arranged at the starting end. The striker 16 is configured as a rack with the second straight line 102 as the length direction. The striker 16 is provided with a transmission tooth 16a perpendicular to the direction of the second straight line 102. The transmission tooth 16a includes a first lifting portion 161. The first driving portion 172 is engaged with the first lifting portion 161 to move the firing assembly 15 from the firing position to the energy storage position. It can be understood that the first driving portion 172 is the first driving tooth of the driving member 17. The first lifting portion 161 is the first transmission tooth. When the driving member 17 starts to drive the firing assembly 15 from the firing position to the energy storage position, the first contact between the driving member 17 and the striker 16 is the first driving portion 172 and the first lifting portion 161. It should be explained that "the first contact between the driving member 17 and the striker 16 is the first driving part 172 and the first lifting part 161" is a theoretical design and the driving tooth 17a and the transmission tooth 16a that should be contacted first when the machine is working normally are respectively configured as the first driving part 172 and the first lifting part 161. The situation that occurs in a fault state or an abnormal state does not belong to the content of this section. Among them, the first driving part 172 includes a first avoidance part 173 configured to avoid the second lifting part 162 below the first lifting part 161. Among them, the second lifting part 162 is configured as other lifting parts except the first lifting part 161. In this application, the transmission teeth on the transmission tooth 16a except the first lifting part 161 are collectively referred to as the second lifting part 162. It can be understood that a certain transmission tooth on the transmission tooth 16a except the first lifting part 161 can also be regarded as the second lifting part 162, and it is not required that any transmission tooth except the first lifting part 161 is the second lifting part 162.

When the firing assembly 15 is fully moved to the firing position (lower dead center), the first driving portion 172, i.e., the first driving tooth, will be located between a transmission tooth 16a in the first lifting portion 161 and the second lifting portion 162. When entering the next nailing cycle, the first driving tooth 17a contacts and engages with the first lifting portion 161, and then the first driving tooth 17a pushes the first lifting portion 161 to move upward. When the firing assembly 15 has not fully moved to the firing position, whether the firing pin 16 rebounds or the firing pin 16 does not fall into place, the first driving tooth 17a will contact or collide with the second lifting portion 162. The present application is provided with a first avoidance portion 173 on the first driving portion 172 that can avoid the second lifting portion 162. The first avoidance portion is configured to allow the second lifting portion to pass through or pass the first driving portion along the moving direction of the firing assembly, thereby avoiding collision or wear between the first driving portion 172 and the second lifting portion 162, thereby increasing the service life of the driving member 17 and the firing pin 16, and improving the service life of the driving member 17 and the firing pin 16. The service life and use safety of the nail gun 100 are improved.

The driving member 17 is also formed with a connecting hole 1713 for connecting the output shaft 125. When the output shaft 125 is connected to the connecting hole 1713, the driving member 17 can rotate synchronously with the output shaft 125. The driving member 17 also includes a second driving portion 175, wherein the second driving portion 175 is configured as a driving portion other than the first driving portion 172. In the present application, the driving teeth 17a on the driving teeth 17a except the first driving portion 172 are collectively referred to as the second driving portion 175. The first driving portion 172 and the second driving portion 175 are evenly distributed in the first section 1711 of the driving member 17. The second driving portion 175 is meshed with the second lifting portion 162 below the first lifting portion 161. In order to ensure the stable meshing of the driving member 17 and the striker 16, the first avoidance portion 173 is not provided on the second driving portion 175. The axial direction of the driving member 17 is defined as the width direction of the driving member 17, and the width of the second driving portion 175 is substantially the same as the width of the first driving portion 172.

The driving member 17 also includes a second section 1712. The second section 1712 is smooth and continuous, and is not provided with driving teeth 17a. As shown in FIG8 , when the driving teeth 17a of the first section 1711 are engaged with the transmission teeth 16a on the striker 16, the driving member 17 can drive the striker 16 so that the piston 151 compresses the gas in the cylinder 13 to perform work. When the second section 1712 cooperates with the striker 16, since the second section 1712 is smooth and continuous, the striker 16 will be quickly pushed out by the gas in the cylinder 13 without being stopped by the driving teeth 17a, thereby achieving a nailing effect.

As shown in FIGS. 8 to 10 , the width H2 of the first lifting portion 161 is greater than the width H3 of the first avoidance portion 173, and the width H4 of the second lifting portion 162 is less than or equal to the width H3 of the first avoidance portion 173. That is, the width of the first lifting portion 161 is greater than the width of the second lifting portion 162. In this embodiment, the first avoidance portion 173 is configured as a groove 1731 extending along the moving direction of the firing assembly 15 on the first driving portion 172. That is, the first avoidance portion 173 is a groove 1731 extending in the longitudinal direction along the direction of the second straight line 102. The groove 1731 penetrates the first driving portion 172 along the circumferential direction of the second straight line 102. An opening is provided on one side of the groove 1731 close to the first lifting portion 161, thereby forming an avoidance channel configured to allow the second lifting portion 162 to pass along the moving direction of the firing assembly (in this embodiment, the up and down direction).

In some embodiments, the first avoidance portion 173 may be a shortened or thinned portion of the first driving portion 172. That is, the specific structure of the first avoidance portion may be designed to be different according to the specific structures of the driving member 17 and the striker 16. Therefore, the structure of the first avoidance portion 173 that allows the second lifting portion 162 to be avoided by the first driving portion 172 is in accordance with the basic principles and main features of the application.

In this embodiment, the first lifting part 161 includes a second rotating shaft 1611, and a roller 164 is arranged on the second rotating shaft 1611, and the roller 164 rotates around the second rotating axis. The second rotating shaft 1611 is fixedly connected to the first lifting part 161 or formed in one piece. The second rotating shaft 1611 is arranged on both sides of the tooth surface of the tooth of the first lifting part 161, and the roller 164 can rotate freely around the second rotating shaft 1611. The roller 164 is arranged on both sides of the tooth of the first lifting part 161 to ensure the width of the position of the first lifting part 161.

The striker 16 further includes a third lifting portion 163. The first lifting portion 161, the second lifting portion 162 and the third The lifting parts 163 are sequentially arranged from near to far from the piston 151. According to the above nailing cycle, when the driving member 17 rotates around the first direction to drive the firing assembly 15 to move until the last tooth of the driving tooth 17a on the driving member 17 is engaged with the transmission tooth 16a at the lowest end of the transmission tooth 16a, the firing assembly 15 is in the energy storage position. That is to say, when the last tooth of the driving tooth 17a is engaged with the tooth at the lowest end of the transmission tooth 16a, it is the top dead center position. At this time, the firing assembly 15 and the driving member 17 are kept in place, and the nail gun 100 enters the waiting stage. At this time, the holding force of the firing assembly 15 is released, that is, the driving member 17 continues to rotate, and then rotates to the second section 1712, at which time the driving tooth 17a is disengaged from the transmission tooth 16a. The third lifting part 163 is configured as the lowest tooth of the striker 16. The tooth on the driving member 17 that contacts and engages with the third lifting part 163 is the third driving part 176. When the nail gun 100 is in the firing state, that is, the firing assembly 15 and the driving member 17 are kept in place, the third driving part 176 and the third lifting part 163 are only engaged through a contact surface, but not in a true sense of tooth engagement. In this case, the third lifting part 163 needs to withstand the force accumulated in the cylinder 13 of the nail gun 100 in the firing state, and at the moment of being released, there is a rolling friction process between the third driving part 176 and the third lifting part 163, which further increases the wear of the third lifting part 163. In order to reduce the wear of the third lifting part 163, a rolling friction member is provided on the third lifting part 163.

In this embodiment, the third lifting part 163 includes a first rotating shaft 1621, and a roller 164 is arranged on the first rotating shaft 1621, and the roller 164 rotates around the first rotating axis. The radius R1 of the roller 164 is greater than or equal to the length H1 of the connecting line between the tooth top of the tooth of the third lifting part 163 and the axis center of the first rotating shaft 1621. The wall surface of the third driving part 176 in contact with the roller 164 is a smooth surface 1761. The first rotating shaft 1621 is fixedly connected or integrally formed with the third lifting part 163. The first rotating shaft 1621 is arranged on both sides of the tooth surface of the tooth of the third lifting part 163, and the roller 164 can rotate freely around the first rotating shaft 1621. When the nail gun 100 is in the ready-to-fire state, the third driving part 176 is actually engaged with the roller 164, and generates a force by squeezing the roller 164. When the nail gun 100 is in a firing state, rolling friction is generated between the third driving portion 176 and the roller 164 , thereby greatly reducing the interaction force between the two and alleviating the wear of the third lifting portion 163 .

Regarding the installation of the striker 16 and the piston 151, in this embodiment, the piston 151 includes a metal part 1511, a first rubber ring 1513 and a second rubber ring 1514. Among them, the metal part 1511 is configured as the main structure of the piston 151 to support the overall structure of the piston 151 and provide sufficient strength. The striker 16 is fixed on the metal part 1511. The first rubber ring 1513 and the second rubber ring 1514 are sleeved on the outside of the metal part 1511. The first rubber ring 1513 and the second rubber ring 1514 are respectively in contact with the inner wall of the cylinder 13. It can be understood that the first rubber ring 1513 and the second rubber ring 1514 are respectively sealed with the inner wall of the cylinder 13 to achieve the function of compressing the piston 151.

As shown in Fig. 4, Fig. 11 and Fig. 12, the cylinder 13 includes a cylinder portion 133 configured to store gas. The cylinder portion 133 is provided with a cavity in which gas is stored. The piston 151 moves in the cylinder portion 133 to compress the gas to perform work. The cylinder 13 is pre-filled with gas through the inflation nozzle 135, thereby eliminating the need for an external air pressure source. In this embodiment, the cylinder 13 also includes an inflation valve 137 and a pressure relief valve 138. The gas charged by the inflation nozzle 135 is After the gas flows through the charging valve 137, it enters the cylinder 13 (i.e., the cavity of the cylinder barrel 133). The pressure relief valve 138 is arranged between the charging nozzle 135 and the charging valve 137. It can be understood that the pressure relief valve 138 is unidirectional and restricts the gas from entering the cylinder 13. The one-way pressure relief valve 138 is arranged on the downstream side of the charging nozzle 135, and the one-way pressure relief valve is connected to the outside of the cylinder to escape the gas. When the pressure of the gas charged into the charging nozzle 135 is greater than the first preset pressure, the gas charged is released through the one-way pressure relief valve 138. When the cylinder 13 is pre-charged, if the pressure of the gas charged is too high, the cylinder 13 will be damaged. Therefore, the pressure relief valve 138 is first arranged behind the charging nozzle 135, so that when the pressure of the gas charged is greater than the first preset pressure, the gas is released to the outside to protect the cylinder 13 from allowing the gas with excessive pressure to enter the cavity of the cylinder barrel 133.

In this embodiment, the pressure relief valve 138 is disposed in the cylinder 13 .

In this embodiment, the charging valve 137 is unidirectional and restricts the gas in the cylinder 13 from flowing out of the cylinder 13 through the charging valve 137 .

In this embodiment, the inflation valve 137 is configured as a valve core structure. It includes an English valve needle, an American valve core, a French valve core, a German valve needle and an Italian valve core. The specific structure of the above inflation valve 137 does not limit the substantive content of the present application. When the gas pressure in the cavity of the cylinder 13 is greater than the second preset pressure, the inflation valve 137 will limit the gas from entering the cavity of the cylinder 13. To prevent the gas pressure in the cavity of the cylinder 13 from being too high, the piston 151 is difficult to compress the gas or damages the cylinder 13 when compressing the gas.

The values of the first preset pressure and the second preset pressure are adjusted and adaptively set according to the requirements of the specific product. In some embodiments, the first preset pressure is less than the second preset pressure. Optionally, the first preset pressure is equal to the second preset pressure.

The cylinder 13 also includes an air filling portion 136, which is connected to the cavity of the cylinder barrel portion 133 through an air filling valve 137. The air filling portion 136 includes a gas channel portion 1361, a gas filling nozzle 135 and an air filling valve 137 are arranged at both ends of the gas channel portion 1361, and a pressure relief valve 138 is arranged on the gas channel portion 1361. When the pressure relief valve 138 and the air filling valve 137 are in a closed state, the air pressure in the gas channel is greater than or equal to the atmospheric pressure. The gas channel portion 1361 forms a second air cavity, the second air cavity has a certain length, and the pressure relief valve 138 releases gas in a direction intersecting with the length direction of the second air cavity.

The cylinder 13 is configured to have a structure with an inner and outer cylinder body. It can be understood that the cylinder barrel portion 133 has an inner cylinder 131 and an outer cylinder 132 arranged around the inner cylinder 131. Among them, the outer cylinder 132 is configured as a cylindrical structure with an opening portion, which has an annular outer wall 1321. A chamber is formed inside the outer cylinder 132. The chamber of the inner cylinder 131 surrounded by the annular inner wall 1312 is configured in the chamber of the outer cylinder 132. The chamber of the inner cylinder 131 and the chamber of the outer cylinder 132 are interconnected. The annular inner wall 1312 is configured to guide the piston 151 to move along the second straight line 102 to compress the gas.

It can be understood that when a double-layer cylinder 13 is provided, the gases in the inner and outer cylinders are connected. When the firing assembly 15 provided in the inner cylinder 131 is driven to compress the gas or driven when the gas is doing work, the contact area with the gas in the cylinder 13 is small, so that the pressure change of the gas in the cylinder 13 is small. The value is small, so that the striking force output by the gas in the cylinder 13 is relatively stable, which also makes the nail gun 100 have a better operating experience.

In this embodiment, the outer cylinder 132 is arranged concentrically with the inner cylinder 131 .

In this embodiment, the inflation portion 136 is disposed on the outer cylinder 132. The inflation nozzle 135, the inflation valve 137 and the pressure relief valve 138 are respectively disposed on the outer cylinder 132. As shown in FIG12 , one end of the closed cylinder bottom 134 of the outer cylinder 132 and the annular outer wall 1321 are an integrally formed structure. In some embodiments, as shown in FIG13 and FIG14 , the cylinder bottom 134 'and the annular outer wall 1321 'are separate components, and a sealing connection is formed by fasteners and seals. As an alternative embodiment, as shown in FIG14 , the inflation nozzle 135 'is configured to restrict the gas from being released from the inflation nozzle 135 'and flowing out of the cylinder.

The inflatable part 136 is arranged at the cylinder bottom 134 or near the cylinder bottom 134. The inflatable part 136 is formed at the cylinder bottom 134 and is located in the cavity of the outer cylinder 132. Optionally, the inflatable part 136 is provided with three mounting ports. The first mounting port 1363 is provided for the inflatable nozzle 135 to enter the inflatable part 136. The second mounting port 1364 is provided for the inflatable valve 137 to enter the inflatable part 136. The third mounting port 1365 is provided for the pressure relief valve 138 to enter the inflatable part 136. The third mounting port 1365 is located between the first mounting port 1363 and the second mounting port 1364. The two ends of the gas channel part 1361 are the first mounting port 1363 and the second mounting port 1364 respectively. It can be understood that the first mounting port 1363 communicates with the outside and the gas channel part 1361. The second mounting port 1364 connects the gas channel part 1361 and the cavity of the outer cylinder 132. The extension axis of the third mounting port 1365 intersects with the extension axis of the gas channel portion 1361, i.e., the second air cavity 1362. When the pressure relief valve 138 and the inflation valve 137 are in a closed state, and when the inflation nozzle 135 is also in a closed state, the gas channel forms a closed cavity, i.e., there is no gas circulation in the second air cavity 1362. In some embodiments, if the inflation nozzle 135 is in a normally open state, and the cylinder 13 maintains gas through the inflation valve 137, the gas channel is in a state of being connected to the atmosphere, and the second air cavity 1362 has gas circulation with the outside atmosphere. Therefore, when the pressure relief valve 138 and the inflation valve 137 are in a closed state, the air pressure in the gas channel is greater than or equal to the atmospheric pressure.

As shown in Figures 13 and 14, in some alternative embodiments, the cylinder 13' may be provided with only one layer of cylinders, that is, only an outer cylinder 132' is provided. The inflatable portion 136' is provided on the outer cylinder 132'.

As shown in Figures 2 and 15 to 16, the second shell 112 forms a second accommodating space 11b. The second shell 112 supports the cylinder 13. Optionally, the outer cylinder 132 is at least partially positioned in the second shell 112. The second shell 112 includes an inflation hole 1121 corresponding to the inflation nozzle 135. That is, the inflation nozzle 135 is exposed to the outside world through the inflation hole 1121. The retaining member 19 is configured to fix the cylinder 13. The retaining member 19 includes a positioning portion 191, and the positioning portion 191 is configured to fix the cylinder 13 at a preset position that corresponds to the inflation nozzle 135 and the inflation hole 1121. The positioning portion indicates the position where the inflation nozzle and the inflation hole are assembled to ensure that the inflation nozzle 135 is assembled in a directional manner. The use of the positioning portion 191 enables the assembler to determine the installation direction and the positioning direction, which is convenient for determining the position.

The positioning portion 191 includes a first indication structure 1911 disposed on the retaining member 19. A second indication structure 1912 is disposed on the cylinder 13. When the first indication structure 1911 and the second indication structure 1912 meet the preset relationship, When the cylinder 13 is connected, the position of the cylinder 13 meets the preset position. In this embodiment, the first indication structure 1911 and the second indication structure 1912 are respectively configured as flattening mechanisms. When the two flattening mechanisms are aligned, when the cylinder 13 is installed in the second housing 112, the position of the inflation nozzle 135 is aligned with the position of the inflation hole 1121, and the assembler does not need to repeatedly adjust to align the position of the inflation nozzle 135 with the position of the inflation hole 1121.

In some embodiments, the first indication structure 1911 and the second indication structure 1912 are respectively configured as notches, concave-convex matching structures, pin-slot matching or similar external structures that can indicate that the assembly is in place, or indicate that the assembly is in place through sound or stop structures.

As shown in FIGS. 15 and 16 , the retaining member 19 is configured to connect the inner cylinder 131 and the outer cylinder 132. Optionally, the inner cylinder 131 is connected to the outer cylinder 132 by rotation, and the positioning portion 191 indicates the rotation end point of the outer cylinder 132. As an embodiment, the retaining member 19 includes: a first thread segment 1311 arranged on the outer side wall of the inner cylinder 131 and a second thread segment 1322 arranged on the inner side wall of the outer cylinder 132, and the first thread segment 1311 is engaged with the second thread segment 1322. When the first indication structure 1911 is aligned with the second indication structure 1912, the first thread segment 1311 and the second thread segment 1322 are rotated and engaged in place. In this embodiment, the retaining member 19 also includes a retaining ring 193 arranged on the outer side of the outer cylinder 132, and the retaining ring 193 limits the first thread segment 1311 from engaging and loosening with the second thread segment 1322. Optionally, the first indication structure 1911 is formed or connected to the retaining ring 193.

The retaining member 19 also includes a support seat 194 connected to the cylinder 13. The support seat 194 is configured to fix the inner cylinder 131 and position the inner cylinder 131 with the housing 11. The support seat 194 is formed with a first through hole 195 through which the firing assembly 15 can pass. The opening of the cylinder 13 through which the piston 151 can pass is connected to the first through hole 195, that is, after the cylinder 13 is connected to the support seat 194, the cylinder 13 and the support seat 194 form a through whole, so that the piston 151 can move within the through range. The whole formed by the cylinder 13 and the support seat 194 is divided by the piston 151 and includes a first space and a second space. Among them, the first space is a relatively closed space formed by one end of the piston 151 close to the cylinder 13. The second space is a relatively open space formed by one end of the piston 151 close to the support seat 194. In an alternative embodiment, the first indication structure 1911 is formed or connected on the support seat 194.

As an alternative embodiment, as shown in FIG. 17 , the cylinder 13 further includes a dustproof portion 198, which is arranged at the position where the striker 16 extends out of the cylinder 13 to limit dust on the striker 16 from entering the cylinder 13. Optionally, the dustproof portion 198 is arranged near the first through hole 195 or in the first through hole 195. Optionally, a buffer pad 196 is also arranged on the support seat 194. When the piston 151 moves to the support seat 194 at high speed, the piston 151 contacts the buffer pad 196 and can offset a part of the kinetic energy, thereby preventing the piston 151 from directly colliding with the support seat 194 and causing damage to the piston 151 or the support seat 194. The dustproof portion 198 is arranged on the striker 16 and placed in the space formed by the buffer pad 196. Optionally, a firing channel 197 is connected to the support seat 194, and a gap is arranged between the firing channel 197 and the buffer pad 196 on the side close to the piston 151, and the dustproof portion 198 is arranged in the above-mentioned gap space. Optionally, the dustproof part 198 includes a felt pad, a rubber pad, a silicone pad or other deformable parts, which are configured to passively block dust on the striker 16 from entering the cylinder 13. 198 includes magnetic and electrostatic adsorption components, which are configured to actively adsorb dust and prevent dust from entering the cylinder 13.

In order to ensure the lubrication of the piston 151 and the cylinder 13, a lubricating substance is provided between the piston 151 and the cylinder 13 to reduce friction, wear and loss of gas work. Since the cylinder 13 is a sealed structure after assembly, as the use time goes by, the movement of the piston 151 will cause the loss of lubricating substances, resulting in wear of the cylinder 13 and the piston 151, resulting in damage to the sealing of the cylinder 13. As an optional implementation of this embodiment, as shown in Figure 18, a lubrication compensation component 18 is provided in the cylinder 13 to compensate for the loss of lubricating substances during operation. The lubrication compensation component 18 includes a first retaining member 181, a second retaining member 182 and a grease storage portion 183. Among them, the first retaining member 181 is connected to one end of the cylinder 13, and is used to maintain the coupling of the lubrication compensation component 18 and the cylinder 13. The second retaining member 182 is formed or connected to the first retaining member 181. The second retaining member 182 is provided with a first groove 1821, and the first groove 1821 is configured to store grease 185. A second groove 1822 is formed on one side of the second retaining member 182 facing the inner wall of the cylinder 13, and the second groove 1822 accommodates the grease storage portion 183. The first groove 1821 and the second groove 1822 are connected by an oil outlet channel 1823. In this embodiment, the grease storage portion 183 includes a porous medium. The porous medium is annular and is arranged around the second retaining member 182. In this embodiment, an elastic element 184 is arranged on the first retaining member 181. A certain gap is set between the piston 151 and the lubrication compensation component 18. In this embodiment, the lubrication compensation component 18 is arranged at the cylinder bottom 134 of the cylinder 13. When the piston 151 compresses the gas, the lubrication compensation component 18 moves toward the cylinder bottom 134 close to the cylinder 13 with the movement of the piston 151, thereby compressing the elastic element 184. When the gas in the cylinder 13 releases energy to push the piston 151, the lubrication compensation component 18 is pushed by the elastic element 184, thereby making the lubrication grease released by the lubrication compensation component 18 as evenly as possible released on the inner wall of the cylinder 13.

As shown in FIG. 2 , FIG. 19 to FIG. 20 , and FIG. 24 , the nail gun 100 further includes a circuit board assembly 32 and a drive circuit 3222 . The motor 121 is a brushless DC motor. The circuit board assembly 32 is electrically connected to the motor 121 to control the motor 121 . The circuit board assembly 32 includes a circuit board body 321 , a controller 322 , a first heat dissipation portion 323 , and a detection module 3221 . The circuit board body 321 includes: a PCB (Printed Circuit Board) and an FPC (Flexible Printed Circuit board). The controller 322 uses a dedicated control chip, such as a single-chip microcomputer, a microcontroller unit MCU (Microcontroller Unit). The controller 322 is disposed on the circuit board body 321 .

The drive circuit 3222 is electrically connected to the stator windings U, V, W of the motor 121, and is used to transfer the current from the battery pack 30 to the stator windings U, V, W to drive the motor 121 to rotate. In one embodiment, the drive circuit 3222 includes a plurality of switching elements Q1, Q2, Q3, Q4, Q5, Q6. The gate terminal of each switching element is electrically connected to the controller 322, and is used to receive a control signal from the controller 322. The drain or source of each switching element is connected to the stator windings U, V, W of the motor 121. The switching elements Q1-Q6 receive the control signal from the controller 322 to change their respective conduction states, thereby changing the current loaded by the battery pack 30 on the stator windings U, V, W of the motor 121 ... The circuit 3222 may be a three-phase bridge driver circuit including six controllable semiconductor power devices (e.g., FET, BJT, IGBT, etc.). It is understood that the switching elements may also be any other type of solid-state switches, such as insulated gate bipolar transistors (IGBTs), bipolar junction transistors (BJTs), etc.

The controller 322 specifically controls the on or off state of the switch element in the driving circuit 3222 through the control chip. The control chip controls the switch element in the driving circuit 3222 to be on or off according to the control signal from the controller 322. In some embodiments, the control signal from the controller 322 is a PWM control signal.

In the process of the controller 322 controlling the running state of the motor 121, the controller 322 will generate a temperature rise. Since the electronic components on the circuit board body 321 are highly sensitive to temperature, if the temperature rise is too high and the heat cannot be dissipated in time, it will not only affect the control efficiency of the controller 322, but also may damage the components on the circuit board body 321. In this embodiment, in addition to the first heat dissipation part 323 of the circuit board assembly 32, the nail gun 100 is also provided with a second heat dissipation part 33. The second heat dissipation part 33 is arranged outside the circuit board assembly 32. And the nail gun 100 is also provided with a heat conducting part 34, which connects the circuit board assembly 32 and the second heat dissipation part 33 so that the circuit board assembly 32 and the second heat dissipation part 33 are in thermal contact. Among them, the second heat dissipation part 33 includes a core part 331 with heat storage capacity and a shell part 332 with heat dissipation capacity, and the core part 331 is configured to undergo a phase change reaction at a preset temperature to cool the shell part 332.

In the present embodiment, the core 331 includes a phase change material. The phase change material is configured to at least partially dissolve at a preset temperature. In some embodiments, the preset temperature is determined according to the temperature change of the first heat dissipation portion. In some embodiments, the preset temperature is determined according to the difference between the temperature of the first heat dissipation portion and the maximum temperature that the circuit board body 321 can withstand. Optionally, the preset temperature is configured to be lower than the temperature of the first heat dissipation portion. Optionally, the preset temperature is configured to be lower than the temperature of the housing portion 332 when the nail gun 100 is in high power output to cool the housing portion 332. The nail gun 100 in a high power output situation includes, for example, the nail gun 100 is in a high output power (operating at a nominal output power or higher), a high speed (at a nominal maximum speed or higher), and a high load (at a nominal output striking force or higher) working state.

The outer shell 332 includes a metal material. In some embodiments, the outer shell 332 includes other heat dissipation and heat conducting materials. The outer shell 332 forms an openable and closable sealed cavity, and the core 331 is contained in the sealed cavity. That is, the phase change material is sealed and contained in the outer shell 332. The phase change material quickly absorbs the heat on the outer shell 332 by a phase change from solid to liquid, and gradually releases the heat when the nail gun 100 stops working or the ambient temperature decreases and a phase change from liquid to solid occurs. The solid-liquid state conversion process of the phase change material occurs in a sealed cavity to prevent the phase change material from leaking. The phase change material forms an endothermic process by converting from solid to liquid and stores heat in the material, and forms a process of heat storage and heat dissipation in the process of converting from liquid to solid. By adding a second heat dissipation part 33 as an auxiliary heat dissipation effect of the first heat dissipation part 323, the heat dissipation capacity is improved. In turn, the working capacity of the nail gun 100 can be further improved. At the same time, the phase change material has the ability to store heat, which is equivalent to energy recovery during the heat dissipation process. The heat storage and heat dissipation process is carried out through the phase change reaction. Compared with the method of increasing the fan 1211 or increasing the power of the fan 1211, the phase change The melting and heat dissipation of the material is more uniform, and the problems of high noise and increased load on the motor 121 are avoided.

In this embodiment, a battery mounting portion 1131 is provided on the handle portion 113. The battery mounting portion 1131 is configured to be detachably connected to the battery pack 30. The circuit board assembly 32 is disposed in the housing 11 of the battery mounting portion 1131. A fan 1211 is connected to the motor 121. When the motor 121 is started, the fan 1211 rotates to generate a heat dissipation airflow. The first heat dissipation portion 323 is configured as a circuit board housing that accommodates the circuit board body 321. In some embodiments, the circuit board housing is made of metal material for heat dissipation. The circuit board housing is also provided with a fin structure 3231. In some embodiments, a phase change material is also provided in the first heat dissipation portion 323 to improve the heat dissipation capability.

The second heat dissipation portion 33 is disposed in the handle portion 113. In this embodiment, the outer shape of the outer shell portion 332 is adapted to the inner wall of the outer shell of the handle portion 113. Optionally, the outer side of the outer shell portion 332 is substantially completely fitted with the inner wall of the outer shell of the handle portion 113.

The heat conducting part 34 includes a metal material to transfer heat between the circuit board assembly 32 and the second heat dissipating part 33. The heat conducting part 34 connects the first heat dissipating part 323 and the shell part 332, and then transfers the heat that the first heat dissipating part 323 cannot release to the second heat dissipating part 33, and uses the second heat dissipating part 33 to assist in heat dissipation.

In this embodiment, the second heat dissipation portion 33 can also assist the heat generating components such as the motor 121, the transmission assembly 122 or the cylinder 13 in dissipating heat when they are working.

As shown in Figures 21 to 23, according to another embodiment of the present application, the gas filling volume of the cylinder 43 can be adjusted. The other structures of the nail gun 100 provided in Figure 1 are basically the same as those provided in this embodiment.

In this embodiment, the cylinder 43 includes a first cavity 431, a second cavity 436 and an adjustment assembly 432. The first cavity 431 accommodates the piston 151, and the piston 151 moves in the first cavity 431. The second cavity 436 is connected to the first cavity 431. The adjustment assembly 432 includes a first state and a second state. When the position of the piston 151 in the first cavity 431 is the same, when the adjustment assembly 432 is in the first state (as shown in FIG. 22), the first cavity 431 and the second cavity 436 define a first effective volume. When the adjustment assembly 432 is in the second state (as shown in FIG. 21), the first cavity 431 and the second cavity 436 define a second effective volume, and the first effective volume is smaller than the second effective volume. The state change of the adjustment assembly 432 causes the inflation volume defined by the cylinder 43 to change, thereby causing the pressure in the cylinder 43 to be different at the beginning. That is, when the firing assembly 15 is in the firing state, the pressure in the cylinder 43 is different. On the one hand, the versatility of the product is improved. For products with different striking force requirements, the cylinder 43 structure can be universal, and different striking force requirements can be achieved by changing the state of the adjustment component 432. In this embodiment, when the same volume of gas is filled into the cylinder 43, the striking force applied by the firing component 15 to the nail when the adjustment component 432 is in the first state is greater than the striking force applied by the firing component 15 to the nail when the adjustment component 432 is in the second state. Since the gas-filled volume defined in the cylinder 43 when the adjustment component 432 is in the first state is smaller than the gas-filled volume defined in the cylinder 43 when the adjustment component 432 is in the second state, when the same volume of gas is filled into the cylinder 43, the pressure in the cylinder 43 when the adjustment component 432 is in the first state is greater than the pressure in the cylinder 43 when the adjustment component 432 is in the second state.

In this embodiment, the piston 151 moves in the first cavity 431, so the volume of the first cavity 431 is related to the moving position of the piston 151. The second cavity 436 is arranged at the relatively upper end of the first cavity 431 and/or at the relatively outer periphery of the first cavity 431. The adjustment component 432 is at least partially arranged in the second cavity 436. Therefore, the defined volume of the first cavity 431 is independent of the state of the adjustment component 432.

The defined volume of the second cavity 436 is related to the state of the adjustment assembly 432 .

The adjustment assembly 432 includes an operating member 433, an adjustment piston 434 and a connecting portion 435. The operating member 433 is driven to switch the working state of the adjustment assembly 432. The adjustment piston 434 is driven by the operating member 433 to move in the second cavity 436. A sealing ring 4341 is provided on the outer side of the adjustment piston 434. The adjustment piston 434 is connected to the inner wall of the second cavity 436 in an airtight manner. As the position of the adjustment piston 434 changes, the volume defined by the second cavity 436 also changes. In this embodiment, the adjustment piston 434 and the inner wall of the second cavity 436 define the volume of the second cavity 436. That is, the volume of the part located at the lower part of the adjustment piston 434 and forming a relatively closed cavity with the second cavity 436 is the volume defined by the second cavity 436. The part located at the upper part of the adjustment piston 434 does not belong to the volume defined by the second cavity 436. The connecting portion 435 connects the operating member 433 and the adjustment piston 434. The connecting portion 435 is driven by the operating member 433 to move the adjusting piston 434, and maintains the position of the adjusting piston 434 when the operating member 433 is released. In the present embodiment, the connecting portion 435 includes a moving portion 4351 with a thread. The operating member 433 is formed or connected with an adjusting portion 4352 that is threadedly matched with the moving portion 4351. The adjusting portion 4352 does not move in the axial direction of the displacement direction of the adjusting piston 434. When the adjusting piston 434 needs to be moved, the operating member 433 is rotated, and then the adjusting portion 4352 and the moving portion 4351 are axially displaced through the thread. When the adjusting piston 434 moves to the position, the mutually engaged threads can maintain the engaged state, so when the operation of the operating member 433 is released, the adjusting piston 434 can still maintain the current position when subjected to the axial force.

In this embodiment, since the position of the adjusting piston 434 can be infinitely adjusted, the adjusting component 432 includes multiple states corresponding to multiple positions.

In some alternative embodiments, the connecting portion 435 can also be a structure that drives the axial movement of the adjusting piston 434 through the axial movement of the operating member 433, which is beneficial to a hydraulic rod, a telescopic rod, etc. Alternatively, the adjusting piston 434 can be moved by pressing the operating member 433 and releasing the operating member 433. In some embodiments, the position of the adjusting piston 434 can also be changed by electronic control.

The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the above embodiments do not limit the present application in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present application.

Claims (20)

A power tool, comprising: case; A power output unit, at least partially disposed within the housing; A cylinder, at least partially disposed within the housing; gas is stored within the cylinder; a piston driven by the power output unit, the piston being disposed in the cylinder and moving in the cylinder to compress the gas in the cylinder; Wherein, the cylinder comprises: An air filling nozzle, through which the cylinder is pre-filled with gas; An air charging valve, wherein the gas charged by the air charging nozzle flows through the air charging valve and then enters the air cylinder; The pressure relief valve is arranged between the inflation nozzle and the inflation valve. When the pressure of the inflation gas of the inflation nozzle is greater than a first preset pressure, the inflation gas is released through the pressure relief valve. The power tool according to claim 1, wherein the pressure relief valve is unidirectional. The power tool according to claim 1, wherein the charging valve is unidirectional. The power tool according to claim 1, wherein the charging valve restricts the gas in the cylinder from flowing out of the cylinder through the charging valve. The power tool according to claim 1, wherein the charging valve restricts gas from entering the cylinder when the pressure in the cylinder exceeds a second preset pressure. The power tool according to claim 5, wherein the first preset pressure is less than or equal to the second preset pressure. The power tool according to claim 1, wherein the cylinder comprises: The cylinder portion is provided with a cavity, wherein the cavity is configured to store gas; An inflation portion is connected to the cavity through an inflation valve. The power tool according to claim 7, wherein the inflation portion comprises a gas channel portion, the inflation nozzle and the inflation valve are arranged at both ends of the gas channel portion, and the pressure relief valve is arranged on the gas channel portion. The power tool according to claim 8, wherein when the pressure relief valve and the inflation valve are in a closed state, the gas pressure in the gas passage is greater than or equal to the atmospheric pressure. The power tool according to claim 8, wherein the gas channel portion forms a second gas cavity, the second gas cavity has a certain length, and the pressure relief valve releases gas along a direction intersecting with the length direction of the second gas cavity. The power tool according to claim 1, wherein the cylinder comprises an inner cylinder and the piston moves within the inner cylinder. According to the power tool according to claim 11, wherein the cylinder further comprises an outer cylinder arranged around the inner cylinder, the inner cylinder and the outer cylinder are connected, and the inflation nozzle, the inflation valve and the pressure relief valve are respectively arranged on the outer cylinder. The power tool according to claim 12, wherein the outer side wall of the inner cylinder is provided with a first thread segment and the inner side wall of the outer cylinder is provided with a second thread segment, and the first thread segment is meshed with the second thread segment. The power tool according to claim 1, wherein the housing comprises an air charging hole corresponding to the air charging nozzle; The invention also includes a retaining member configured to fix the cylinder, wherein the retaining member includes a positioning portion, the positioning portion is at least partially disposed on the cylinder, and the positioning portion indicates a position where the inflation nozzle is assembled with the inflation hole. According to the power tool according to claim 14, wherein the positioning portion includes a first indication structure, and a second indication structure is provided on the cylinder, and when the first indication structure and the second indication structure satisfy a preset relationship, the cylinder is fixed at a preset position so that the inflation nozzle corresponds to the inflation hole. A power tool, comprising: case; A power output unit, at least partially disposed within the housing; A cylinder, at least partially disposed within the housing; gas is stored within the cylinder; A piston driven by the power output part, the piston being disposed in the cylinder and moving in the cylinder to compress the gas in the cylinder; An air filling nozzle, through which the cylinder is pre-filled with gas; A one-way pressure relief valve is arranged at the downstream side of the inflation nozzle, and the one-way pressure relief valve is connected to the outside of the cylinder to release gas. A power tool, comprising: case; A power output unit, at least partially disposed within the housing; A cylinder, at least partially disposed within the housing; gas is stored within the cylinder; A piston is driven by the power output unit, and the piston is disposed in the cylinder and in the cylinder Moving inside to compress the gas in the cylinder; Wherein, the cylinder comprises: An inflation nozzle, through which the cylinder is pre-filled with gas; the inflation nozzle restricts the release of the gas from the inflation nozzle; A one-way pressure relief valve is arranged at the downstream side of the inflation nozzle. When the pressure of the inflation gas of the inflation nozzle is greater than the first preset pressure, the inflation gas is released through the one-way pressure relief valve. The power tool according to claim 17, wherein the cylinder comprises: an inner cylinder, and the piston moves in the inner cylinder. According to the power tool according to claim 18, wherein the cylinder further comprises an outer cylinder arranged around the inner cylinder, the inner cylinder and the outer cylinder are connected, and the inflation nozzle and the one-way pressure relief valve are respectively arranged on the outer cylinder. The power tool according to claim 19, wherein the outer side wall of the inner cylinder is provided with a first thread segment and the inner side wall of the outer cylinder is provided with a second thread segment, and the first thread segment is meshed with the second thread segment.