CN116406578A - chain saw - Google Patents

Abstract

The invention discloses a chain saw, comprising: a casing forming an accommodation space; a cutting assembly including a guide plate and a chain, the cutting assembly is used for cutting operations; a motor including a motor shaft, the motor shaft is substantially perpendicular to the guide plate; a transmission assembly, It is connected with the motor and decelerates the output speed of the motor shaft; the width of the casing in the axial direction of the motor is less than 95 mm. The chain saw achieves the effects of narrower width, lighter weight and better user experience.

Description

chain saw

technical field

The invention relates to a hand-held electric tool, in particular to a chain saw.

Background technique

Chainsaws, also known as pruners, are often used to trim branches or forest trees.

Chainsaws are usually directly driven by motors, and their commonly used transmission structure is realized by the external meshing of large and small gears. This transmission method is often used in chainsaws with large output power. For small chainsaws with relatively small output power, or portable chainsaws, users expect them to be small and light.

However, in order to make the size of the chain saw smaller, designers also have technical difficulties that are difficult to choose. Generally speaking, to achieve the same output power, a lighter and smaller motor will usually provide a higher speed. Therefore, for high-power chainsaws, in order to achieve the cutting effect, a larger motor is often used to ensure that the output speed of the motor is lower and the transmission is more stable, thereby reducing gear wear, heat and noise, etc., making the machine life longer. For small to medium-sized chainsaws with relatively weak cutting ability, in order to make them smaller and lighter, motors with smaller volume need to be used. At this time, on the premise of not increasing the overall size, common large, It is difficult to provide a high reduction ratio for the transmission mode of the external meshing of the pinion, which makes it difficult for researchers to break through the lower limit of the size of the small chain saw.

Therefore, how to make the chain saw compact and light has become a technical problem to be solved urgently.

Contents of the invention

The purpose of the present invention is to provide an internal arrangement method that can make the chain saw small in size and light in weight.

In order to achieve the above object, the present invention adopts the following technical solutions: a chain saw, including a casing, forming an accommodation space; a cutting assembly, including a guide plate and a chain, and the cutting assembly is used for cutting operations; a motor, including a motor shaft, and the motor shaft and The guide plate is basically vertical; the transmission component is connected with the motor, and reduces the rotational speed output by the motor shaft; it is characterized in that the width of the casing in the axial direction of the motor is less than 95 mm.

Optionally, the transmission assembly includes intermeshing planetary gears and an outer ring gear.

Optionally, the planet gears are arranged on the planet carrier.

Optionally, the planetary carrier is an integrally formed double-supported planetary carrier, and both sides of the planetary gear are simultaneously supported by the double-supported planetary carrier.

Optionally, the casing forms a connecting portion at one end close to the battery pack for connecting and fixing the battery pack; an air inlet is arranged on the connecting portion, and the wind sucked by the air inlet passes through a surface of the circuit board in the casing , discharged from the air outlet near the motor.

Optionally, the air inlets are arranged at least on the left and right sides of the connecting part.

Optionally, the air inlet is arranged at least on the rear side of the connecting part.

Optionally, a fan is included on the right side of the motor, and the wind blown by the fan is exhausted through the air outlet.

Optionally, a gripping portion for gripping is also formed on the casing, and the guide plate and the gripping portion are basically in a straight line.

Optionally, the chain saw includes a trigger for controlling the start and stop of the chain saw, and the center of gravity of the chain saw is substantially located near the trigger.

The chainsaw involved in the present invention realizes the reduction of the length of the chainsaw in the front-back direction and the left-right direction by arranging the motor perpendicular to the cutting plane, and using a transmission mode in which the first-stage planetary gear meshes with the outer ring gear, and also obtains a complete machine The beneficial effects of lighter weight and a better positioned center of gravity enhance the user experience.

Description of drawings

Fig. 1 is the schematic diagram of the chain saw involved in the present invention;

Fig. 2 is a partial schematic diagram of the chain saw shown in Fig. 1 after the left casing is removed;

Fig. 3 is a schematic diagram of the internal structure of the chain saw shown in Fig. 2;

Fig. 4 is a schematic diagram of the internal structure shown in Fig. 3 under another viewing angle;

Fig. 5 is an exploded schematic diagram of the transmission assembly shown in Fig. 3;

Fig. 6 is a sectional view of the planet carrier shown in Fig. 5;

Fig. 7 is a top view of the chain saw shown in Fig. 1;

Fig. 8 is a sectional view obtained by cutting the motor shaft in the top view shown in Fig. 7;

Fig. 9 is a schematic view of the air duct of the chain saw shown in Fig. 1 at a certain viewing angle;

Fig. 10 is a schematic view of a part of the chainsaw in another view of the air duct;

Figure 11 is a schematic view of the part of the chainsaw near the battery pack and the circuit board at a certain angle of view;

Figure 12 is a schematic diagram of the part of the chainsaw near the battery pack and the circuit board from another perspective;

Fig. 13 is a schematic diagram when the cutting assembly of the chainsaw has a certain angle with the holding part;

Fig. 14 is a schematic view of the cutting assembly of the chainsaw and the grip portion substantially in a straight line.

Detailed ways

In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings, and the described embodiments are only part of the implementation of the present invention. example, not all examples.

In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "front", "rear" etc. are based on the attached The orientation or positional relationship shown in the figure is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a reference to this invention. Invention Limitations. In addition, the terms "first", "second", etc. are used for descriptive purposes only, or for distinguishing different structures or components, and should not be construed as indicating or implying relative importance.

1 to 4 are schematic diagrams of a chainsaw 100. The chainsaw 100 includes a casing 80, a cutting assembly 10, a motor 85, a transmission assembly 35, a battery pack 84, and the like. Wherein, the cutting assembly 10 includes a chain 12 , a guide plate 13 supporting the movement of the chain 12 and a guard 11 protecting the chain. The transmission assembly 35 drives the sprocket 14 to rotate, and then drives the chain 12 to move to realize the cutting operation. The casing 80 is jointly formed by the left casing 60 and the right casing 70 , and the casing 80 provides a receiving space 81 (see FIG. 2 ). In this embodiment, the right housing 70 accommodates a motor 85 (see FIG. 3 ), and the axial direction of the motor 85 is substantially perpendicular to the plane where the guide plate 13 is located. As shown in FIG. 3 and FIG. 4 , the motor shaft 86 of the motor 85 outputs torque and rotational speed to the sprocket 14 through the deceleration of the transmission assembly 35 to drive the chain 12 to move. The transmission assembly 35 includes an outer ring gear 30 and a planetary gear assembly 40 . The planetary gear assembly 40 includes only one stage of planetary gears. They are housed together in a gear case 50 and sealed by a gear case cover 20 .

The right casing 70 is provided with a first positioning groove 71 for positioning the gear case 50 , and the outer circumference of the gear casing 50 has a first protrusion 53 (see FIG. 3 ) which can be inserted into the first positioning groove 71 on the right casing 70 , thereby avoiding the rotation of the gear case 50 after being put into the right casing 70 . There is also a second protrusion 54 (see FIG. 4 ) on the outer periphery of the gear case 50 to help the gear case 50 not easily shake after being put into the right casing 70 . There are slopes 541 on the right side of the second protrusion 54 close to the gear case 50 , these slopes 541 are for the purpose of the gear case 50 can be put into the right casing 70 more easily during assembly.

The transmission assembly 35 is composed of a planetary gear assembly 40 and the outer ring gear 30 meshed with it. The planetary gear assembly 40 is composed of a planetary carrier 41 and a planetary gear 42 . The pin 43 positions the planetary gear 42 in the planetary carrier 41 . The motor shaft 86 of the motor 85 enters the planet carrier 41 , and the sun gear on the motor shaft 86 meshes with the inside of the planetary gear 42 , and the planetary gear 42 meshes with the inner tooth circumference 32 of the outer ring gear 30 . There is a third protrusion 31 on the outer circumference of the outer ring gear 30, and the third protrusion 31 enters into the second positioning groove 51 of the gear case 50, so that when the motor shaft 86 of the motor 85 rotates and drives the planetary gear 42 to rotate, the outer ring gear 30 The ring gear 30 cannot rotate together, and the above-mentioned one-stage gear reduction is formed.

The gear box cover 20 has an opening 21 for the planet carrier shaft 411 to pass through. The outer circumference of the gear box cover 20 has a third protrusion 22, for the convenience of design and assembly, the third protrusion 22 here has the same arrangement as the second protrusion 31 of the outer ring gear 30, and is inserted into the gear case 50 together in the second positioning groove 51. The gear box cover 20 can also be sealed with the gear box body 50 in other forms, which will not be repeated here.

As shown in Figures 5 and 6, the planetary carrier 41 used in this embodiment is an integrally formed double-supported planetary carrier 41a, and its two sides have a first support surface 415 and a second support surface 416, respectively, for supporting the planetary gears The two sides of 42 make it not offset, and at least one connecting part 414 connects the first support surface 415 and the second support surface 416, so that the first support surface 415 and the second support surface 416 do not move relative to each other, and the entire planet carrier The structure of 41 makes the planetary gear 42 rotate smoothly therein. The planetary carrier 41 has a planetary carrier shaft 411 facing the direction of the sprocket 14, and the planetary carrier shaft 411 drives the sprocket 14 to rotate together. In this embodiment, the planetary carrier shaft 411 has a flat position, which is more convenient in assembly. It can be understood that other mating surface shapes can also be set, or a pin can be used to pass through the planet carrier shaft 411 and the sprocket 14 to make the planet carrier shaft 411 and the sprocket 14 rotate together. At this time, the transmission ratio of the transmission assembly 35 is between 6.5:1 and 8.5:1.

FIG. 7 is a top view of the chainsaw 100 , and FIG. 8 is a cross-sectional view of the chainsaw 100 cut along the axial direction of the motor 85 . 3, 4 and 8, four bearings are used in this embodiment, which are respectively the third bearing 15 located between the gear box cover 20 and the planet carrier shaft 411 of the planet carrier 41, and the shaft sleeve located at the planet carrier 41. 412 and the first bearing 17 between the motor shaft 86, the second bearing 18 between the outer circumference of the shaft sleeve 412 of the planetary carrier 41 and the inner circumference of the gear case 50, and the position where the motor shaft 86 is close to the fan 87 and The fourth bearing 19 between the right casing 70. The above four bearings slow down the axial vibration of the chain saw 100 during rotation, prolonging the service life of the whole machine. There is a gasket 16 between the second supporting surface 416 of the planet carrier 41 and the first bearing 17 to prevent the pin 43 from directly contacting the first bearing 17 to cause greater wear. 6, the sleeve 412 of the double support planet carrier 41a contains a groove 417 for setting the second bearing 18, the outer circumference of the sleeve 412 of the double support planet carrier 41a is placed the first bearing 17, the first bearing 17 It partially overlaps with the second bearing 18 in the axial direction of the motor 85, shortening the axial dimension of the machine.

It can be understood that the planetary carrier 41 can also use multiple parts to cooperate together, such as a single-side planetary carrier supported on one side and a planetary carrier shaft, instead of integrally formed, so as to reduce costs. However, the structure of the double-supported planetary carrier 41a is more stable and more reliable. The positioning of the planetary carrier shaft 411 is precise, and the two supporting surfaces are supported together, so that the planetary gear 42 is not easy to break and fail.

As shown in FIG. 7 , the maximum width between the left housing 60 and the right housing 70 is the first width L along the direction perpendicular to the cutting plane, ie along the axial direction of the motor 85 . It should be noted here that since the tensioning structure 90 of the adjustment chain can be redesigned and replaced, the outermost surface of the tensioning structure 90 can be "higher" or "lower" than the surface of the casing, and its width is not included in the The overall width of the chainsaw 100. The width of the chainsaw mentioned in this document refers to the maximum width of the casing 80 of the chainsaw 100 perpendicular to the cutting direction without the tensioning structure 90, which is represented by the first width L shown in FIG. 7 The width of the chainsaw 100. The present invention realizes that the width of the casing 80 in the direction perpendicular to the cutting plane is less than 95 mm, that is, the first width L between the left casing 60 and the right casing 70 is smaller than 95 mm. The researchers of the present invention can design chain saws 100 of different sizes to meet different cutting requirements by changing the model of the motor 85 and adjusting the transmission ratio of the transmission assembly 35. Therefore, the researchers of the present invention will actually use the first A width L is 70 mm, 75 mm, 80 mm, 85 mm and 90 mm.

9 to 12 disclose the air duct arrangement of the chainsaw 100 . Specifically, referring to FIG. 1 , there is an air inlet near the battery pack 84 on the grip portion 82 , a first air inlet 66 is provided on the left side of the left housing 60 , and a second air inlet 76 is provided on the right side of the right housing 70 . The rear side of the left casing 60 has a third air inlet 65 , and the rear side of the right casing 70 has a fourth air inlet 75 . Take the partially enlarged view of the right casing 70 shown in FIG. 11 and FIG. 12 as an example, the right casing 70 has a limiting rib 77 for limiting the circuit board 83 in the limiting rib 77 to avoid its shaking. The circuit board 83 has a first surface 831 closer to the battery pack 84 and a second surface 832 farther from the battery pack 84 . It should be noted that the positions of the second air inlet 76 and the fourth air inlet 75 on the right casing 70 are both higher than the first surface 831 of the circuit board 83 , that is to say, the air sucked by the air inlet mainly passes through the circuit board 83 Instead of entering from the gap between the first surface 831 and the battery pack 84 , it flows toward the second surface 832 .

In conjunction with Fig. 8, the fan 87 rotates on the right side of the motor 85, so that the air pressure near the fan 87 is relatively low, and the colder air from the outside flows from the first air inlet 66, the second air inlet 76, the third air inlet 65 and the fourth air inlet. The air inlet 75 enters the accommodation space 81 of the casing 80, takes away the heat on the second surface 832 of the circuit board 83, moves forward along the holding part 82 in the accommodation space 81 of the casing 80, and passes through the motor 85 , and finally discharge on the right casing 70 near the air outlet of the motor 85. The air outlets are roughly along the upper, lower and front three directions, i.e. the first air outlet 72, the second air outlet 73 and the third air outlet 74 (see Figure 4), and an air outlet towards the user is not provided to prevent The hot air blown out by the air outlet affects the use of the user. It can be understood that when the left-right arrangement of the chainsaw 100 is interchanged, that is, when the left-right orientation of the motor 85 and the cutting assembly 10 are interchanged, the technical characteristics disclosed in the above description are still satisfied and still fall within the protection scope of the present invention.

As shown in FIG. 13, in this embodiment, the cutting assembly 10 of the chain saw 100a extends approximately along the direction of the first straight line 101, and the grip portion 82 extends approximately along the direction of the second straight line 102. The first straight line 101 and the second straight line 101 An included angle is formed between the straight lines 102, and the included angle is larger than 10° and smaller than 20°. As shown in Fig. 14, in another embodiment, the first straight line 101 and the second straight line 102 of the chain saw 100b are basically coincident, or the first straight line 101 and the second straight line 102 are basically coincident and parallel with a relatively small distance. The holding portion 82 is substantially in a straight line with the cutting assembly 10 . For the above two arrangements, when the user cuts a branch in front of him without lifting his hand over his head, the chainsaw 100 in the first embodiment can allow the user's arm to exert force better and obtain more Easy cutting feel. When the user needs to cut high wood branches, the chain saw 100b in the second embodiment makes the length of the whole machine longer, the user can more easily reach the high wood branches, and saves labor when cutting high places for a long time.

The beneficial technical effects of the present invention are summarized from the following aspects. First, due to space constraints in the common transmission mode of large and small gears with external meshing, the large gear cannot achieve a large volume, so it cannot achieve a large reduction ratio, while the one-stage planetary gear transmission can be used in a small space A higher reduction ratio is realized inside, so that a motor with smaller volume, lighter weight and higher rotation speed can be applied to the chainsaw 100, thereby shortening the width of the chainsaw 100 as a whole. Second, the planetary gear 42 of the present invention is arranged on the double-supported planetary carrier 41a, which ensures smooth transmission when the gear rotates, helps prevent the gear from vibrating and cracking, and prolongs the life of the machine; and the bearings partially overlap in the axial direction of the motor 85, Further shorten the width of the chain saw 100 complete machine. Third, the edge of the gear case 50 near the fan 87 and the right casing 70 form a sealed structure, which prevents the hot air from flowing back toward the sprocket 14, thereby avoiding the setting of air guide ribs on the part of the right casing 70 near the fan 87 To limit the flow direction of the wind, this indirectly helps to shorten the overall width of the chainsaw 100 . Fourth, using a motor perpendicular to the cutting plane with a planetary gear transmission structure, when the chainsaw 100 is installed with a battery pack, its center of gravity is located near the trigger 9 (see FIG. 1 ) for controlling the start and stop of the chainsaw 100 . When the user holds the handle and operates the chainsaw 100 , a proper center of gravity position allows the user to have a better operating experience and alleviate wrist fatigue during long-term cutting.

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the above-mentioned embodiments do not limit the present invention in any form, and all technical solutions obtained by means of equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims (10)

1. A chain saw, comprising:

a housing forming an accommodating space;

the cutting assembly comprises a guide plate and a chain and is used for performing cutting operation;

a motor comprising a motor shaft, the motor shaft being substantially perpendicular to the guide plate;

the transmission assembly is connected with the motor and used for reducing the rotating speed output by the motor shaft;

the method is characterized in that:

the width of the casing in the axial direction of the motor is less than 95 mm.

2. The chain saw as set forth in claim 1, wherein:

the transmission assembly includes intermeshing planetary gears and an outer gear ring.

3. A chain saw according to claim 3, wherein:

the planetary gears are disposed on a carrier.

4. The chain saw as set forth in claim 4, wherein:

the planet carrier is an integrally formed double-support planet carrier, and two sides of the planet gear are simultaneously supported by the double-support planet carrier.

5. The chain saw as set forth in claim 1, wherein:

the shell forms a connecting part at one end close to the battery pack and is used for connecting and fixing the battery pack; the connecting part is provided with an air inlet, and air sucked by the air inlet passes through one surface of the circuit board in the shell and is discharged from an air outlet near the motor.

6. The chain saw as set forth in claim 5, wherein:

the air inlets are arranged at least on the left and right sides of the connecting part.

7. The chain saw as in claim 6, wherein:

the air inlet is arranged at least at the rear side of the connection portion.

8. The chain saw as in claim 6, wherein:

the right side of the motor comprises a fan, and wind blown out by the fan is discharged from the air outlet.

9. The chain saw as set forth in claim 1, wherein:

the shell is also provided with a holding part for holding, and the guide plate and the holding part are basically in a straight line.

10. The chain saw as recited in claim 9, wherein:

the chain saw comprises a trigger for controlling the start and stop of the chain saw, and the gravity center of the chain saw is basically positioned near the trigger.

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