CN119244678A

CN119244678A - A shock absorber and a packaging method thereof and a vehicle

Info

Publication number: CN119244678A
Application number: CN202411358314.9A
Authority: CN
Inventors: 李郑子; 叶继校; 单振东
Original assignee: Anhui Weiyuan New Energy Technology Co ltd
Current assignee: Anhui Weiyuan New Energy Technology Co ltd
Priority date: 2024-09-27
Filing date: 2024-09-27
Publication date: 2025-01-03

Abstract

The invention discloses a shock absorber and a packaging method thereof and a vehicle, belonging to the field of shock absorption technology. The shock absorber has high reliability, and includes a sleeve, a bellows assembly, a piston assembly and a piston rod. The sleeve is provided with a first seal and a second seal at both ends, respectively. The first seal is provided with a mounting hole penetrating along the axial direction of the sleeve, and a first inner cavity filled with a first fluid is formed between the first seal and the second seal; the bellows assembly is provided in the sleeve and is subjected to the pressure of the first fluid, and can be telescoped along the axis when the pressure changes, and the telescope can adjust the internal space of the bellows assembly to buffer the pressure change, and the internal space is independent of or connected to the first inner cavity; the piston assembly is provided in the first inner cavity and can move along the axial direction, and a flow structure is provided on the piston assembly; the piston rod is provided through the mounting hole and connected to the piston assembly, and a sealing element is provided between the mounting hole and the piston rod, and the piston rod is driven to move in the sleeve to change the pressure.

Description

Shock absorber, packaging method thereof and vehicle

Technical Field

The invention belongs to the technical field of shock absorption, and particularly relates to a shock absorber, a packaging method thereof and a vehicle.

Background

The shock absorber is widely applied in the fields of elevators, vehicles, buildings and the like, and the shock absorber is used for buffering the parts which collide or vibrate so as to protect the parts.

Generally, shock absorbers have a free piston enclosed within a cylinder (or housing) that is freely slidable within the cylinder and capable of dividing a fluid chamber and a gas chamber within the cylinder. In this shock absorber there is also provided a driving piston connected to a piston rod, the extension and contraction of which causes a capacity change of the liquid chamber, which can be compensated by an axial displacement of the free piston in the cylinder, in order to increase the capacity of the liquid chamber while reducing the capacity of the gas chamber, or vice versa.

The free piston is generally provided with a sealing member such as an O-ring on its outer periphery. The seal member is arranged to be in contact with an inner periphery of the cylinder at a predetermined contact pressure, friction is generated between the seal member and the inner periphery of the cylinder when the free piston slides axially in the cylinder, and sliding of the free piston occurs when a differential pressure between the liquid chamber and the gas chamber exceeds a frictional resistance between the seal member and the inner periphery of the cylinder. This feature of the free piston may make the shock absorber having the free piston built therein less reliable, and particularly, the free piston frequently rubs against the inner wall of the cylinder, and as the number of times of use increases, the sealing performance of the free piston may be degraded, which may easily cause gas-liquid mixing.

Disclosure of Invention

In view of the foregoing problems of the prior art, the present application provides a shock absorber, a method of packaging the shock absorber, and a vehicle. The shock absorber avoids frequent friction of the isolation structures of the liquid cavity and the gas cavity, and can effectively avoid gas-liquid mixing, so that the shock absorber has higher reliability and higher response speed to vibration.

The exemplary embodiment of the present application is implemented as follows.

In a first aspect, an example of the present application proposes a shock absorber, comprising:

The device comprises a hollow sleeve, a first sealing piece and a second sealing piece, wherein the two ends of the sleeve are respectively provided with the first sealing piece and the second sealing piece, and the first sealing piece is provided with a mounting hole penetrating along the axial direction of the sleeve;

The bellows component is arranged in the sleeve and is acted by the pressure of the first fluid, and can stretch and retract along the axial direction when the pressure changes, the size of the inner space of the bellows component can be adjusted by stretching and retracting to buffer the pressure changes in the first inner cavity, and the inner space is independent of or communicated with the first inner cavity;

A piston assembly disposed in the first cavity and movable along the axial direction, the piston assembly having a flow structure for allowing the first fluid to flow therethrough, and

The piston rod penetrates through the mounting hole and is connected with the piston assembly, a sealing element is arranged between the mounting hole and the piston rod, and the piston rod is driven to move in the sleeve to change the pressure.

According to some examples of the first aspect of the present application, one end of the bellows assembly is fixedly connected to the second seal member, the other end is movable in the axial direction to achieve the expansion and contraction when the pressure changes, and the internal space is independent of the first inner chamber, and a gap between the bellows assembly and the sleeve communicates with the first inner chamber.

According to some examples of the first aspect of the application, a second lumen is further formed between the first seal and the second seal, the second lumen being independent of the first lumen, and the first lumen being defined by the bellows assembly and the first seal within the sleeve, the second lumen being defined by the bellows assembly and the second seal within the sleeve, one of the first lumen and the second lumen being in communication with an interior space of the bellows assembly and the other being in communication with a gap between the bellows assembly and the sleeve.

According to some examples of the first aspect of the application, the bellows assembly comprises:

A securing portion fixedly connected to an inner wall of the sleeve, and the second lumen is defined by the securing portion and the second seal;

A movable portion provided between the fixed portion and the first seal member, the movable portion being movable in the axial direction within the sleeve to achieve the expansion and contraction, and the first inner cavity being defined by the movable portion and the first seal member, and

The corrugated pipe, the one end of corrugated pipe with movable part sealing connection, the other end with fixed part is connected, just the inner space of corrugated pipe with the second inner chamber intercommunication.

According to some examples of the first aspect of the application, the second seal has a second fluid port formed thereon, the second fluid port being in communication with the interior space.

Further, a first fluid inlet and outlet is arranged on the sleeve, and the first fluid inlet and outlet is communicated with the first inner cavity.

a securing portion fixedly connected to an inner wall of the sleeve, and the first lumen is defined by the securing portion and the first seal;

a movable portion provided between the fixed portion and the second seal member, the movable portion being movable in the axial direction within the sleeve to achieve the expansion and contraction, and the second inner cavity being defined by the movable portion and the second seal member, and

The corrugated pipe, the one end of corrugated pipe with fixed part is connected, the other end with movable part sealing connection, just the inner space of corrugated pipe with first inner chamber intercommunication.

According to some examples of the first aspect of the application, the second seal has a second fluid port formed thereon, the second fluid port being in communication with the second lumen;

According to some examples of the first aspect of the present application, the sleeve includes a first sleeve and a second sleeve, an inner diameter of the second sleeve is larger than an inner diameter of the first sleeve, an inner wall of the second sleeve is connected with an outer wall of the first sleeve, the fixing portion is disposed at the connection, the first inner cavity is located in the first sleeve, and a minimum inner diameter of the bellows is the same as the inner diameter of the first sleeve.

According to some examples of the first aspect of the application, the piston assembly comprises a piston body, a guide ring and a sealing ring arranged at the outer periphery of the piston body, and the piston body is connected with the piston rod, and the flow structure is arranged on the piston body.

Further, the flow-through structure includes:

The first valve block group and the second valve block group are sequentially and independently arranged at the first end and the second end of the piston body, and can move along the axial direction to be close to or far away from the surface of the end;

The first through hole and the second through hole penetrate through the piston body along the axis direction, and when the first valve block group is tightly attached to the surface of the first end, the inlet and outlet of the first through hole close to the first end are closed by the first valve block group, the inlet and outlet of the second through hole close to the first end are kept communicated, and when the second valve block group is tightly attached to the surface of the second end, the inlet and outlet of the first through hole close to the second end are kept communicated, and the inlet and outlet of the second through hole close to the second end are closed by the second valve block group.

In a second aspect, an example of the present application proposes a method of packaging a shock absorber, comprising the steps of:

Providing a hollow sleeve, a first sealing member and a second sealing member, a bellows assembly, a piston assembly and a piston rod, and assembling the damper to obtain the inner space independent of the first inner cavity;

Driving the piston rod to abut against the bellows assembly so as to enable the bellows assembly to be in a compressed state, and filling a second fluid into the inner space through the second fluid inlet and outlet until an inner pressure of 0.1-0.3 MPa is obtained;

Vacuumizing and filling first fluid into the first inner cavity through the first fluid inlet and outlet in sequence, and connecting the first fluid inlet and outlet with an overflow valve with a first preset pressure after the first inner cavity is filled with the first fluid;

Filling the interior space with a second fluid through the second fluid inlet and outlet to a second predetermined pressure state, and

The second fluid port is blocked and the overflow valve is removed and the first fluid port is blocked.

In a third aspect, an example of the present application further proposes a method for packaging a shock absorber, comprising the steps of:

Providing a hollow sleeve, a first sealing piece, a second sealing piece, a bellows assembly, a piston assembly and a piston rod, and assembling to obtain the damper with the inner space communicated with the first inner cavity;

Driving the piston rod to abut against the proximal end of the bellows assembly, and filling a second fluid into the second inner cavity through the second fluid inlet and outlet until an internal pressure of 0.1 to 0.3MPa is obtained;

In a fourth aspect, an example of the application proposes a vehicle comprising the aforementioned shock absorber or the aforementioned method-packaged shock absorber.

Drawings

FIG. 1 is a schematic view of a shock absorber according to an example of the present application;

FIG. 2 is a schematic illustration of the mounting structure of a bellows assembly in accordance with an example of the present application;

FIG. 3 is a schematic view of another shock absorber according to an example of the present application;

FIG. 4 is a schematic view of an exemplary guide ring according to the present application;

FIG. 5 is a schematic illustration of a piston assembly according to an example of the present application;

FIG. 6 is a schematic illustration of another piston assembly according to an example of the present application;

in the figure:

1. Sleeve, 11, first sealing piece, 12, second sealing piece, 111, mounting hole, 13, first inner cavity, 14, second inner cavity, 15, first fluid inlet and outlet, 16, second fluid inlet and outlet;

2. A bellows assembly; 20 parts of internal space, 21 parts of fixed part, 22 parts of movable part, 23 parts of corrugated pipe, 221 parts of diversion notch, 222 parts of cut-off port;

3. The piston assembly, 31, the circulation structure, 32, the piston body, 33, the guide ring, 34 and the sealing ring;

311. the valve comprises a first through hole, a second through hole 312, a first valve plate group 313, a second valve plate group 314 and a second valve plate group;

321. First end face 3210, first notch 322, second end face 3220, second notch;

4. A piston rod.

Detailed Description

Taking the field of vehicles as an example, in order to quickly attenuate the vibration (vibration) between a frame and a vehicle body and improve the smoothness and comfort of running of an automobile, a shock absorber is arranged in an automobile suspension system, the vehicle body is mounted on the shock absorber, and the generated vibration is buffered by the shock absorber. To the best of the inventors' knowledge, many shock absorbers currently in use rely on a free piston that is freely slidable within a cylinder (or housing), with the free piston dividing the fluid chamber and gas chamber within the cylinder (or housing), and compensating for the change in volume of the fluid chamber caused by shock by axial displacement of the free piston, thereby cushioning the shock. In the shock absorber structure, the free piston and the inner wall of the air cylinder (or the shell) form a matching relation of dynamic sealing (separating the liquid cavity and the air cavity), the reliability of the dynamic sealing is lower, the dynamic sealing can fail along with the increase of the friction times, and the response speed of the free piston to vibration change is slower.

In order to solve the problems, the inventor carries out new design on the structure of the shock absorber, replaces a free piston in a cylinder (or a shell) with a bellows assembly, and the bellows assembly realizes separation of a liquid cavity and a gas cavity in the cylinder (or the shell), and the separation is not a dynamic sealing separation form of the free piston in a friction state, and the sealing state of the separation is stable and is not easy to fail. The bellows assembly has the advantages that the bellows assembly can provide an expandable/contractible inner space, the inner space can provide dynamic compensation for a liquid cavity or a gas cavity to form buffering, better reliability compared with a free piston can be provided, the bellows assembly 2 has high response speed, and corresponding expansion/contraction changes can be timely carried out along with vibration changes, so that vibration can be buffered rapidly.

The technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to fig. 1 to 6, and it is apparent that the described embodiments are some embodiments of the present disclosure, but not all embodiments. Based on the embodiments in this disclosure, all other embodiments that a person skilled in the art would obtain without making any inventive effort are within the scope of protection of this disclosure.

Referring to fig. 1 to 6, a shock absorber according to an embodiment of the present application includes a sleeve 1, a bellows assembly 2, a piston assembly 3, and a piston rod 4, wherein:

The sleeve 1 is of a hollow structure, a first sealing element 11 is arranged at one end of the sleeve 1, a second sealing element 12 is arranged at the other end of the sleeve 1, a mounting hole 111 is formed in the first sealing element 11 for the piston rod 4 to penetrate through, the mounting hole 111 penetrates through along the axial direction of the sleeve 1, and a sealing element is further arranged between the mounting hole 111 and the piston rod 4 to ensure that no fluid leakage occurs when the piston rod 4 reciprocates through the mounting hole 111;

The bellows assembly 2 is arranged in the sleeve 1, on one hand, the inner space 20 of the bellows assembly 2 can be independent of the first inner cavity 13, so that the inner space 20 is used as the second inner cavity 14 for filling the second fluid (such as gas), the volume of the inner space 20 can expand/contract along the pressure difference of the two fluids, on the other hand, the inner space 20 of the bellows assembly 2 can be communicated with the first inner cavity 13 to supplement the first fluid accommodating space, and the outer space defined in the sleeve 1 by the peripheral wall of the bellows assembly 2 can be used as the second inner cavity 14 for filling the second fluid (such as gas);

The piston assembly 3 is arranged in the first inner cavity 13 and can be driven to move along the axial direction of the sleeve 1, the piston assembly 3 is also provided with a circulation structure 31, and the circulation structure 31 is used for the first fluid to pass through when the piston assembly 3 moves, so that the first fluid circulates due to the pressure change at the two sides of the piston assembly 3;

The piston rod 4 moves within the sleeve 1 when driven to change the length of the piston rod 4 into the sleeve 1 (first lumen 13), and the pressure within the first lumen 13 is thus changed.

In the embodiment of the application, the bellows component 2 is used for replacing a free piston in the traditional shock absorber, the bellows component 2 is used for separating two inner cavities (gas-liquid cavities) in the sleeve 1, and the dynamic seal of the free piston has higher reliability. The bellows assembly 2 of the embodiment of the application can be completely connected with the sleeve 1 or the second sealing element 12 through welding, so that the two inner cavities (gas-liquid cavities) of the shock absorber are completely isolated, the traditional shock absorber uses a free piston to separate the two inner cavities (gas-liquid cavities), the dynamic sealing isolation of the free piston is realized by means of a movable sealing ring (O-shaped ring) on the free piston, one end of the movable sealing ring (O-shaped ring) contacts with hydraulic oil and performs high-frequency reciprocating motion for a long time under high-pressure and high-temperature environment, and the movable sealing ring (O-shaped ring) is easy to permanently deform and wear, so that the gas in the gas cavity enters the liquid cavity to form a state of oil-gas mixing, and further, a lost motion phenomenon occurs in the compression stroke of the shock absorber. In addition, compared with the free piston, the bellows assembly 2 of the embodiment of the present application has a faster response to changes, and in particular, the shock absorber performs high-frequency reciprocating motion during operation, the free piston of the conventional shock absorber has a large mass and a large inertia, and when the piston rod changes the movement direction, the free piston cannot immediately change the movement direction due to the effect of the inertia, so that the response is poor, while the bellows assembly 2 of the embodiment of the present application has a smaller mass, a smaller inertia, and a faster response speed.

Bellows assembly 2

In the first embodiment, referring to fig. 1 and referring to fig. 2, the inner space 20 of the bellows assembly 2 is independent from the first inner cavity 13, specifically, one end of the bellows assembly 2 is fixedly connected with the second sealing member 12, the other end extends toward the first sealing member 11, and the other end of the bellows assembly 2 is in a sealed state to separate the inner space 20 of the bellows assembly 2 from the first inner cavity 13, the inner space 20 of the bellows assembly 2 is used for filling the second fluid, when the pressure of the first fluid in the first inner cavity 13 changes, the pressure of the first fluid and the second fluid inside and outside the bellows assembly 2 is unbalanced, and the other end of the bellows assembly 2 moves along the axial direction of the sleeve 1 to realize expansion and contraction of the bellows assembly 2, and thus the volume of the inner space 20 is changed, so that the pressures of the first fluid and the second fluid inside and outside the bellows assembly 2 tend to be balanced. In this embodiment, there is also a gap between the bellows assembly 2 and the inner wall of the sleeve 1, which communicates with the first lumen 13 to be filled with the first fluid so that the outer peripheral surface of the bellows assembly 2 is in sufficient contact with the first fluid, which helps to ensure the balance of the internal and external pressures of the bellows assembly 2.

In the second embodiment, a second inner cavity 14 independent from the first inner cavity 13 is further formed in the first sealing member 11 and the second sealing member 12, specifically, the bellows assembly 2 is disposed between the first sealing member 11 and the second sealing member 12, and the inner cavity of the sleeve 1 can be divided into the first inner cavity 13 and the second inner cavity 14 independent from each other by the peripheral wall of the bellows assembly 2. In the present example, a first lumen 13 is defined within the sleeve 1 by the bellows assembly 2 and the first seal 11, and a second lumen 14 is defined within the sleeve 1 by the bellows assembly 2 and the second seal 12. And, the bellows assembly 2 is open towards the second lumen 14, i.e. the second lumen 14 communicates with the interior space 20 of the bellows assembly 2, while the first lumen 1 communicates with the gap between the bellows assembly 2 and the sleeve 1. Taking the structure illustrated in fig. 1 as an example, this embodiment differs from that illustrated in fig. 1 in that there is a second inner chamber 14 (the second inner chamber 14 is not illustrated in fig. 1) for filling the second fluid between the left end of the bellows assembly 2 and the second seal 12 of this embodiment.

In the third embodiment, referring to fig. 3, the bellows assembly 2 is also disposed between the first seal member 11 and the second seal member 12, and the inner cavity of the sleeve 1 is divided into a first inner cavity 13 and a second inner cavity 14 which are independent from each other by the peripheral wall of the bellows assembly 2. Unlike the second embodiment, the bellows assembly 2 is open towards the first lumen 13, i.e. the first lumen 13 communicates with the interior space 20 of the bellows assembly 2, and the second lumen 14 communicates with the gap between the bellows assembly 2 and the sleeve 1.

In contrast, in the third embodiment, the opening of the bellows assembly 2 is directed to the first inner chamber 13, and the inner space 20 is thus filled with the first fluid (oil), whereas in the first and second embodiments, the inner space 20 of the bellows assembly 2 is filled with the second fluid (gas) and is closed, and the gas has a light mass, and the compression rebound process is relatively more sensitive.

As shown in connection with fig. 1, 2 and 3, the bellows assembly 2 of the above embodiment may include a fixed portion 21, a movable portion 22 and a bellows 23, the bellows 23 may be made of a metal material such as austenitic stainless steel, and the bellows 23 may be constructed in a full wave shape. One end of the bellows 23 is connected with the fixed part 21 and is arranged in the sleeve 1 through the fixed part 21, and the other end of the bellows 23 is connected with the movable part 22 and realizes the expansion and contraction of the bellows 23 along with the movement of the movable part 22. Accordingly, the first inner cavity 13 and the second inner cavity 14 which are independent from each other can be separated in the sleeve 1 by the fixed portion 21, the movable portion 22 and the pipe wall of the bellows 23, and the following examples further describe the separation of the inner cavities of the sleeve 1 by the bellows assembly 2.

In the first example, in the first embodiment as described above, the fixing portion 21 may be integrally configured with the second seal member 12, for example, the fixing portion 21 may be an annular structure configured at and protruding from the end face of the second seal member 12, via which the fixed and sealed connection of one end portion of the bellows 23 and the second seal member 12 is achieved, and the integral configuration may obtain a good sealing effect, thereby preventing leakage of fluid through the connection of the fixing portion 21 and the second seal member 12. And the other end of the bellows 23 is sealed with the movable part 22 to isolate the inner space of the bellows 23 from the outer space such as the first lumen 13, thereby separating the spaces of the two fluids. As shown in fig. 1,2 and 4, in order to enable the movable portion 22 to move along the axial direction of the sleeve 1, an annular guide member is provided on the movable portion 22, which may be made of plastic material, and is located between the outer wall of the bellows 23 and the inner wall of the sleeve 1 (for example, the annular guide member is attached to the outer edge end of the end sealing member of the bellows 23), the bellows 23 is ensured to stretch along the axial direction of the sleeve 1 by using the annular guide member, and an inward concave flow guiding notch 221 is provided on the annular guide member, fluid flows into the gap between the bellows 23 and the sleeve 1 through the flow guiding notch 221, and a cut-off opening 222 is also formed on the annular guide member, so that the annular guide member can be unfolded for easy installation.

Second example in the second embodiment as above, in order to make the opening of the bellows assembly 2 face the second inner chamber 14, the present example fixedly connects the fixed portion 21 with the inner wall of the sleeve 1 and the second inner chamber 14 is formed by the space defined by the fixed portion 21 and the second seal 12 within the sleeve 1, while the movable portion 22 is provided between the fixed portion 21 and the first seal 11, and the movable portion 22 is movable in the axial direction within the sleeve 1 to achieve expansion and contraction, and the first inner chamber 13 is formed by the movable portion 22 and the space defined by the first seal 11 within the sleeve 1, one end of the bellows 23 is sealingly connected with the movable portion 22, the other end is connected with the fixed portion 21, and the fixed portion 21 does not seal the end of the bellows 23, so that the inner space 20 of the bellows 23 communicates with the second inner chamber 14.

Third example, referring to fig. 3, in the above third embodiment, in order to make the opening of the bellows assembly 2 face the first inner chamber 13, the present example fixedly connects the fixed portion 21 with the inner wall of the sleeve 1, and the first inner chamber 13 is a space defined between the fixed portion 21 and the first seal 11 in the sleeve 1, while the movable portion 22 is provided between the fixed portion 21 and the second seal 12, and the movable portion 22 is movable in the sleeve 1 in the axial direction to achieve expansion and contraction, and the second inner chamber 14 is a space defined between the movable portion 22 and the second seal 12 in the sleeve 1, one end of the bellows 23 is connected with the fixed portion 21, the other end is connected with the movable portion 22 in a sealing manner, and the fixed portion 21 does not seal the end of the bellows 23, so that the inner space 20 of the bellows communicates with the first inner chamber 13.

In the above embodiments and examples, the second sealing member 12 is further provided with a second fluid inlet and outlet 16, and the second fluid inlet and outlet 16 communicates with a space (e.g., the inner space 20 in the above first example, and the second inner cavity 14 in the second example and the third example) of the sleeve 1, which is independent of the first inner cavity 13, as shown in fig. 1 and 3. And the sleeve 1 is provided with a first fluid inlet and outlet 15, the first fluid inlet and outlet 15 being on the side close to the first seal 11 and communicating with the first inner chamber 13. When the inner space 20 communicates with the first lumen 13 or the second lumen 14, the inner space 20 realizes the filling and the discharging of the fluid through the corresponding fluid inlet and outlet.

Sleeve 1

Referring to fig. 3, in some embodiments, the sleeve 1 includes a first sleeve and a second sleeve, the second sleeve has an inner diameter larger than that of the first sleeve, and an inner wall of the second sleeve is connected to an outer wall of the first sleeve, and the fixing portion 21 is disposed at a connection portion, so that assembly of the shock absorber is facilitated, for example, the bellows 23 is welded and fixedly connected at a predetermined connection portion and then the first sleeve and the second sleeve are welded and connected. The first inner chamber 13 is located in the first sleeve, and in order to prevent the first fluid from accelerating when flowing to the bellows 23 due to pressure change, the minimum inner diameter of the bellows 23 is the same as the inner diameter of the first sleeve 1, so that the same size of the flowing cross section is ensured, and the bellows 23 is prevented from being damaged due to the fact that the fluid accelerates to form a large impact force.

Piston assembly 3

Referring to fig. 5, 6 in combination with fig. 1 and 3, in some implementations, the piston assembly 3 includes a piston body 32, and a guide ring 33 and a seal ring 34 disposed at an outer periphery of the piston body 32, and the piston body 32 is connected to the piston rod 4, the piston body 32 moves within the sleeve 1 when the piston rod 4 is driven, the guide ring 33 ensures a moving direction of the piston body 32 in an axial direction of the sleeve 1, the seal ring 34 leaves no gap between the piston body 32 and an inner wall of the sleeve 1, and the circulation structure 31 is disposed on the piston body 32.

Illustratively, the flow-through structure 31 includes first and second through-holes 311, 312, and first and second valve plate sets 313, 314. The first through hole 311 and the second through hole 312 extend through the piston body 32 along the axial direction of the sleeve 1, the first valve block group 313 is independently disposed at the first end of the piston body 32, the second valve block group 314 is independently disposed at the second end of the piston body 32, the first valve block group 313 can move along the axial direction to be close to or far from the first end surface 321, the second valve block group 314 can move along the axial direction to be close to or far from the second end surface 322, when the first valve block group 313 is close to the first end surface 321, the inlet and outlet of the first through hole 311 close to the first end are closed by the first valve block group 313, and the inlet and outlet of the second through hole 312 close to the first end are kept communicated for inflow of fluid, and similarly, when the second valve block group 314 is close to the second end surface 322, the inlet and outlet of the first through hole 311 close to the second end are kept communicated for inflow of fluid, and the inlet and outlet of the second through hole 312 close to the second end is closed by the second valve block group 314.

The first valve plate group 313 may be a single valve plate disposed on the corresponding end surface, or may be a plurality of stacked valve plates disposed on the corresponding end surface. Referring to fig. 5, in an example, the first valve plate group 313 is provided with a communication hole whose position corresponds to that of the second through hole 312, and in order to ensure that the communication hole can be aligned with the second through hole 312 when the first valve plate group 313 is close to the first end surface 321, it is also possible to provide a positioning engagement structure, such as a protrusion structure (e.g., hemispherical protrusion, triangular annular protrusion) on one surface of the valve plate (group) and the surface (e.g., first end surface 321) with which it is in contact, and a recess structure (e.g., hemispherical recess, triangular annular recess) engaged with the protrusion on the other surface, such that the communication hole can be aligned with the second through hole 312 when the surface of the valve plate (group) is close to the surface with which it is in contact, without deviation. The arrangement of the second valve plate set 314 and its positioning and matching structure with the second end face 322 are similar to those described above.

Referring to fig. 5, in another example, a first notch 3210 is formed at a position corresponding to an end of the second through hole 312 on the first end surface 321, and a second notch 3220 is formed at a position corresponding to an end of the first through hole 311 on the second end surface 322. The first notch 3210 ensures that when the first valve plate group 313 is close to the first end surface 321, a gap remains between the first valve plate group 313 and the end of the second through hole 312 for fluid inflow, and the second notch 3220 ensures that when the second valve plate group 314 is close to the second end surface 322, a gap remains between the second valve plate group 314 and the end of the first through hole 311 for fluid inflow.

The above description has been given of the shock absorber of the present application in detail and fully discussed, and therefore, those skilled in the art can implement the shock absorber of the present application example based on these contents and apply the shock absorber to the related structure of the automobile, and the shock absorber is good in reliability and fast in response speed to vibration.

Further, the inventor found that the shock absorber is capable of buffering the pressure difference between two fluids (gas and liquid) by means of the volume change of the inner cavity of the fluid, the fluid filling and packaging operation of the shock absorber is an important ring for determining the shock absorbing performance, and the improper fluid filling operation may cause the pressure difference between the inner and outer sides of the bellows 23 to be too large to damage or affect the service life.

To this end, the embodiment of the application further provides a method for packaging the shock absorber, which comprises the following steps S100 to S500:

step S100, providing the hollow sleeve 1, the first seal 11 and the second seal 12, and the bellows assembly 2, the piston assembly 3, the piston rod 4, and assembling to obtain the shock absorber of the foregoing embodiment;

Step S200, driving the piston rod 4 to move until the piston rod 4 abuts against the proximal end of the bellows assembly 2 (the left end of the bellows assembly 2 is illustrated in fig. 1 and 3), and filling a second fluid (e.g. gas) into the space where the other end of the bellows assembly 2 is located through the second fluid inlet and outlet 16 until an internal pressure of 0.1 to 0.3MPa is obtained in the space;

step S300, sequentially vacuumizing and filling the first inner cavity 13 with the first fluid through the first fluid inlet and outlet 15, and connecting the first fluid inlet and outlet 15 with an overflow valve with a first preset pressure (determined according to design requirements) after the first inner cavity 13 is filled with the first fluid;

Step S400, filling the second fluid into the inner space 20 through the second fluid inlet and outlet 16 until the inner space 20 obtains a second preset pressure (determined according to design requirements) in which the second preset pressure obtained by the inner space 20 is greater than 0.3MPa, and

In step S500, after the first fluid and the second fluid are filled with the overflow valve to reach the desired design pressure, the second fluid inlet and outlet 16 is blocked, and the overflow valve is removed and the first fluid inlet and outlet 15 is blocked.

During the packaging process of the shock absorber, a part of the second fluid is filled through the second fluid inlet and outlet 16 to reach 0.1 to 0.3MPa, and the first cavity 13 is filled with the first fluid in the pressure state, the first fluid acts on the corrugated tube 23 to enable the corrugated tube 23 to be compressed, so as to avoid over-compression of the corrugated tube 23, and the inner space 20 of the corrugated tube assembly 2 is pre-filled with a part of the second fluid before the first fluid is filled, so that the corrugated tube 23 is protected. And the inner space 20 is filled with the second fluid again after being filled with the first fluid, at which time the bellows 23 is prevented from being broken due to the incompressibility of the first fluid. Excessive compression means that the bellows is compressed too far to rebound normally.

Further, in some examples, when step 200 is performed on the shock absorber of the foregoing first and second embodiments, the bellows assembly 2 is first put into a compressed state by the stroke of the piston rod 4, and then passes through the second fluid inlet and outlet 16. When the piston rod 4 is abutted and further pressed to enable the bellows assembly 2 to be in a compressed state, namely a maximum extension state of the bellows assembly 2 is limited, the application can prevent the bellows 23 from being damaged due to excessive stretching and extension in the packaging process by vacuumizing the state.

While step 200 is performed on the shock absorber of the aforementioned third embodiment, the piston rod 4 is driven to abut against the proximal end (the left end as illustrated in fig. 3) of the bellows assembly 2 and the bellows assembly 2 is left in a free state (i.e., free expansion), and then the second fluid is filled into the second inner chamber 14 through the second fluid inlet and outlet 16 to obtain an internal pressure of 0.1 to 0.3 MPa.

On the basis of the embodiment, the embodiment of the application also provides a vehicle, which comprises the shock absorber or the shock absorber packaged based on the method.

It should be noted that the method for packaging a vehicle and a shock absorber includes the shock absorber described in the above embodiments, and has the same advantages as those of the above shock absorber embodiments, so that the description thereof will not be repeated. For technical details not disclosed in the embodiments of the vehicle and the method for packaging the shock absorber of the present application, those skilled in the art will understand with reference to the foregoing description of the shock absorber, and for the sake of economy, the details are not repeated here.

In the above description of the present application, the terms "fixed," "mounted," "connected," or "connected" are to be construed broadly, unless otherwise specifically indicated and defined. For example, the term "coupled" may be a fixed connection, a removable connection, or a combination thereof, may be a mechanical connection, or may be an electrical connection, may be a direct connection, may be an indirect connection via an intermediary, or may be a communication between two elements or an interaction between two elements. Therefore, unless otherwise defined explicitly, those skilled in the art will understand the specific meaning of the terms in the present application according to the specific circumstances.

From the foregoing description of the application, those skilled in the art will also understand that terms such as "upper", "lower", "front", "rear", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "center", "longitudinal", "transverse", "clockwise" or "counterclockwise" and the like, which refer to terms of orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings of the present application, are merely for the purpose of facilitating the explanation of aspects of the present application and simplifying the description, and do not explicitly or implicitly refer to devices or elements that are necessarily constructed and operated with the particular orientation, and therefore such orientation or positional relationship terms should not be construed or construed as limiting aspects of the present application.

In addition, the terms "first" or "second" and the like used in the present application are used to refer to numbers or ordinal terms only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three or more, etc., unless explicitly defined otherwise.

While various embodiments of the present application have been shown and described herein, it will be obvious to those skilled in the art that such embodiments are provided by way of example only. Numerous modifications, changes, and substitutions will occur to those skilled in the art without departing from the spirit and scope of the application. It should be understood that various alternatives to the embodiments of the application described herein may be employed in practicing the application. The appended claims are intended to define the scope of the application and are therefore to cover all equivalents or alternatives falling within the scope of these claims.

Claims

1. A shock absorber, comprising:

The device comprises a hollow sleeve, a first sealing piece and a second sealing piece, wherein the two ends of the sleeve are respectively provided with the first sealing piece and the second sealing piece, and a mounting hole penetrating along the axial direction of the sleeve is formed in the first sealing piece;

2. The shock absorber of claim 1 wherein one end of said bellows assembly is fixedly connected to said second seal member and the other end is movable in said axial direction upon said pressure change to effect said telescoping, and said interior space is independent of said first interior chamber, a gap between said bellows assembly and said sleeve being in communication with said first interior chamber.

3. The shock absorber according to claim 1, wherein a second inner cavity is further formed between said first seal and said second seal, said second inner cavity being independent of said first inner cavity, and said first inner cavity being defined by said bellows assembly and said first seal within said sleeve, said second inner cavity being defined by said bellows assembly and said second seal within said sleeve, one of said first inner cavity and said second inner cavity being in communication with an interior space of said bellows assembly, and the other being in communication with a gap between said bellows assembly and said sleeve.

4. A shock absorber according to claim 3, wherein the bellows assembly comprises:

5. A shock absorber according to claim 3, wherein the bellows assembly comprises:

6. The shock absorber according to claim 2,4 or 5, wherein said second seal member has a second fluid port formed therein, said second fluid port being in communication with a space separate from said first interior chamber;

7. The shock absorber according to claim 4 or 5, wherein said sleeve comprises a first sleeve and a second sleeve, an inner diameter of said second sleeve being larger than an inner diameter of said first sleeve, and an inner wall of said second sleeve being connected to an outer wall of said first sleeve, said fixing portion being provided at said connection, said first inner cavity being located within said first sleeve, and a minimum inner diameter of said bellows being the same as an inner diameter of said first sleeve.

8. The shock absorber according to any of claims 1 to 5, wherein said piston assembly comprises a piston body, and a guide ring and a seal ring disposed at an outer periphery of said piston body, and said piston body is connected to said piston rod, said flow-through structure being disposed on said piston body;

Further, the flow-through structure includes:

9. A method of packaging a shock absorber, comprising the steps of:

providing a hollow sleeve, a first seal and a second seal, and a bellows assembly, a piston rod, and assembling to obtain the shock absorber of claim 6;

driving the piston rod to abut against the proximal end of the bellows assembly, and filling a second fluid into a space where the other end of the bellows assembly is located through the second fluid inlet and outlet until an internal pressure of 0.1-0.3 MPa is obtained;

10. A vehicle comprising a shock absorber according to any one of claims 1 to 8, or a shock absorber packaged according to the method of claim 9.