Brake structure of chain saw

Abstract

The utility model belongs to the technical field of chain saws, and particularly relates to a brake structure of a chain saw, which comprises a chain saw body, a power motor, a control switch and a protective plate, the bottom of the protective plate is arranged in the chain saw body and is provided with a control bump and a clamping bump, and the clamping bump is provided with a first clamping groove and a second clamping groove. A damping assembly is further arranged in the chain saw body and comprises a damping spring and a damping ejector block, when the top end of the damping ejector block is arranged in the first clamping groove, after the protective plate is driven to rotate, the damping ejector block moves inwards and compresses the damping spring, and when a second clamping groove in the protective plate rotates to correspond to the damping ejector block in position, the damping ejector block moves inwards and compresses the damping spring. At the moment, the compressed damping spring pushes the damping ejector block to be separated from the first clamping groove and enter the second clamping groove, so that rotation of the protection plate is limited, the brake structure is simple, the protection plate cannot shake on the chain saw body, the safety of the chain saw is improved, the production process of the damping assembly is simple, and the rejection rate is low.

Description

TECHNICAL FIELD

[0001] The utility model belongs to chain saw technical field, especially chain saw's brake structure. BACKGROUND

[0002] It is known that chain saw is a kind of tool for cutting wood, metal, stone and other materials. It is composed of a chain with sharp teeth, which is rotated along the guide plate, and the rotation of the chain is driven by the power provided by the electric motor or gas engine, and the teeth on the chain quickly pass through the cut object during operation, so as to realize efficient cutting operation, and chain saw can be widely used in logging, pruning branches, construction, woodworking processing and outdoor maintenance and other fields.

[0003] And chain saw has certain dangerous in actual operation, when danger occurs, chain saw must be braked, chain moves in very short time to prevent chain from cutting operator, so chain saw on the market has brake structure, such as the chain saw brake structure of Chinese patent CN202322893477.4, the thickness of brake return plate spring in chain saw body is thinner, the elasticity of brake return plate spring is poor, and the elasticity of brake return plate spring will be weakened after long time deformation, so when brake return plate spring and first protrusion at the bottom of brake plate are in abutment state, the stability between first protrusion and brake return plate spring is poor, so brake plate is easy to shake, and first protrusion can even be separated from brake return plate spring, so that second protrusion at the bottom of brake plate is far away from throttle control valve, so chain saw enters working state, when operator accidentally presses control switch of chain saw, chain saw will work, so it is easy to cause casualties, and the manufacturing process of brake return plate spring is troublesome, it needs a series of steps such as heating bending treatment, die forming, cooling and shaping to produce, which greatly increases the scrap rate of brake return plate spring and causes resource waste. SUMMARY

[0004] The utility model aims at providing a kind of brake structure with simple structure, protective plate does not shake on chain saw body, improve the security of chain saw, and the production process of damping assembly is simple, and scrap rate is lower, can reduce manufacturing cost.

[0005] The utility model aims at providing a kind of brake structure with simple structure, protective plate does not shake on chain saw body, improve the security of chain saw, and the production process of damping assembly is simple, and scrap rate is lower, can reduce manufacturing cost.

[0006] The brake structure of the chain saw comprises a chain saw body, a power motor arranged in the chain saw body, a control switch for controlling the operation of the power motor, and a protective plate rotatably arranged on the chain saw body. The bottom of the protective plate is arranged in the chain saw body and is provided with a control protrusion and a clamping protrusion. The rotation of the protective plate can control the start or stop of the control switch through the control protrusion at the bottom of the protective plate. The clamping protrusion is provided with a first clamping groove and a second clamping groove. The chain saw body is further provided with a damping assembly comprising a damping spring and a damping top block abutting against the damping spring. When the top end of the damping top block is arranged in the first clamping groove, the damping top block moves inward and compresses the damping spring after the rotation of the protective plate. When the second clamping groove on the protective plate is rotated to correspond to the position of the damping top block, the compressed damping spring pushes the damping top block out of the first clamping groove and into the second clamping groove, thereby limiting the rotation of the protective plate.

[0007] Further, the chain saw body is provided with a mounting groove. The damping spring and the damping top block are arranged in the mounting groove. The two ends of the damping spring are respectively abutted against the bottom of the mounting groove and the damping top block. The top end of the damping top block is provided with a damping protrusion. The first clamping groove and the second clamping groove can be clamped with the damping protrusion respectively.

[0008] Further, the bottom of the damping top block is provided with an abutting groove. One end of the damping spring is arranged in the abutting groove and abutted against the damping top block.

[0009] Further, the inner walls on both sides of the first clamping groove and the second clamping groove are provided with clamping inclined surfaces. The two sides of the damping protrusion are provided with guide inclined surfaces matched with the clamping inclined surfaces.

[0010] Further, the chain saw body is further provided with a cover plate covering the mounting groove. The cover plate is provided with a connecting portion. The chain saw body is provided with a hole column. The connecting portion is provided with a connecting hole. The connecting hole and the hole column are provided with a connecting rod.

[0011] Further, the chain saw body is provided with a fixing groove. The control switch is arranged in the fixing groove.

[0012] Further, the chain saw body is provided with a gear box. The gear box is integrally formed with a mounting portion. The mounting portion is sleeved on the power motor. The gear box forms a transmission space. The power motor is provided with a motor shaft. The motor shaft is located in the transmission space. The gear box is rotatably provided with a power main shaft and a transmission gear assembly. The two ends of the transmission gear assembly are respectively connected with the power main shaft and the motor shaft.

[0013] Further, the power motor is provided with a fixing rod. The mounting portion is provided with a fixing hole. The fixing rod is arranged in the fixing hole and fixedly connected with the mounting portion.

[0014] Further, the gear box comprises a box body and a box cover covering the box body, the transmission gear assembly is arranged in the box body, the box cover is provided with a through hole, the power main shaft is exposed outside the gear box through the through hole, the inner wall of the through hole is provided with a limiting table, a bearing is sleeved on the power main shaft, the bearing is located in the through hole, and the top end of the bearing abuts against the limiting table.

[0015] Further, the transmission gear assembly comprises a driving gear and a driven gear meshing with the driving gear, the driven gear is sleeved on the power main shaft and is fixedly connected with the power main shaft, the driving gear is sleeved on the motor shaft and is fixedly connected with the motor shaft, one end of the power main shaft is arranged outside the chain saw body, the power main shaft is provided with a rotating wheel, the chain saw body is provided with a guide plate, a chain is annularly arranged on the guide plate, and one end of the chain is sleeved on the rotating wheel.

[0016] Compared with the prior art, the utility model has the advantages of the following prominent and beneficial technical effects:

[0017] The utility model belongs to chain saw technical field, especially chain saw's brake structure, including chain saw body, the power motor of setting in chain saw body, the control switch of control power motor work, control switch mainly user control whether the power motor in chain saw body can normally work, and the rotatory setting of chain saw body has the fender, the fender can play the protection function, it is the protection device that most chain saws on market have, and the control boss and the joint projection of fender bottom set up in chain saw body, the operator can decide whether the control boss triggers the control switch by rotating the fender, when the control boss and control switch contact, make control switch be in starting state, the power motor in chain saw body can work normally, and because the damping assembly in chain saw body includes damping spring and the damping top block that abuts with damping spring, and the joint projection is provided with first joint groove and second joint groove, when the control boss and control switch contact, the top end of damping top block sets up in first joint groove and joint projection is jointed at this time, under the impetus of damping spring, thereby limit the joint projection automatic rotation, make fender not rotate forward voluntarily under the action of no external force, power motor can work normally at this time, the operator in the process of using chain saw, the control boss can not separate from control switch, make the power motor in chain saw body keep working state, make the operator in the process of normally using chain saw chain saw not work suddenly, will not affect the normal work of operator, when the operator needs chain saw emergency stop work, the operator can push the fender forward at this time, make fender rotate forward, the control boss will separate from control switch, make control switch close, thereby make power motor stop working immediately, and at the same time the joint projection on fender will rotate backward, the joint projection will exert downward pressure on damping top block, make damping top block separate from first joint groove, and at the same time damping spring will enter compression state, when the second joint groove on fender rotates to a certain angle along with fender, the position of damping top block will correspond with the position of second joint groove, the compressed damping spring will push damping top block to move upward at this time, thereby make damping top block enter second joint groove and joint with joint projection, make fender not rotate backward voluntarily, compared with the chain saw on market, the brake reset leaf spring is used to limit fender rotation, the elasticity of this brake reset leaf spring is poor, and when long time deformation occurs, the elasticity of brake reset leaf spring will weaken, thereby lead to fender easy to shake, make the safety of chain saw greatly reduce, and its manufacturing process is troublesome, the scrap rate is higher, the utility model restricts fender rotation through damping top block joint in first joint groove or second joint groove, this kind of structure that restricts fender rotation is more stable and firm, thereby ensure that fender not rotate voluntarily under the action of no external force, make fender not shake, and make fender not produce shaking sound in the process of chain saw work, avoid because the joint between damping top block and joint projection is unstable, thereby make fender rotate voluntarily and trigger control switch,The safety of the chain saw is greatly improved, and compared with the brake return plate spring, the brake return plate spring needs to be produced through a series of steps such as heating bending treatment, mold pressing forming, cooling and shaping, so that the scrap rate of the brake return plate spring is relatively high, while the damping spring is a common strong spring on the market, and the damping spring has good elasticity and fatigue resistance, so that the elasticity of the damping spring is not weakened after long-term deformation, and the production process of the damping spring is very mature, so that the production scrap rate of the damping spring is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a perspective view of the utility model.

[0019] Figure 2 is a schematic view of the internal structure of the utility model.

[0020] Figure 3 is an exploded view of the chain saw body and the cover plate of the utility model.

[0021] Figure 4 is a schematic view of the structure of the control knob and the control switch in the triggering state.

[0022] Figure 5 is a partial enlarged view of B in the figure. Figure 4

[0023] Figure 6 is a schematic view of the structure of the control knob and the control switch in the disengaged state.

[0024] Figure 7 is a partial enlarged view of A in the figure. Figure 6

[0025] Figure 8 is an exploded view of the chain saw body and the control switch and the damping assembly of the utility model.

[0026] Figure 9 is an exploded view of the chain saw body and the power motor and the gear box of the utility model.

[0027] Figure 10 is an exploded view of the damping spring and the damping top block of the utility model.

[0028] Figure 11 is a perspective view of the damping top block of the utility model.

[0029] Figure 12 is a perspective view of the protective plate of the utility model.

[0030] Figure 13 is a perspective view of the power motor and the gear box of the utility model.​​

[0031] Figure 14 is the structural diagram of the gear box inside the utility model.

[0032] Figure 15 is the perspective view of the box cover of the utility model.

[0033] Figure 16 is the exploded view of the gear box and the power motor of the utility model.

[0034] Figure 17 is the structural diagram of the power spindle and the chain of the utility model.

[0035] The meaning represented by the reference signs in the figure is:

[0036] 1-chain saw body; 2-protection plate; 3-control switch; 4-control convex block; 5-clamping convex block;

[0037] 7-damping assembly; 8-first clamping groove; 9-second clamping groove; 10-installation groove;

[0038] 11-damping spring; 12-damping top block; 13-damping convex; 16-abutment groove; 17-clamping inclined surface;

[0039] 18-guiding inclined surface; 19-cover plate; 20-connecting part; 21-connecting hole; 22-connecting rod;

[0040] 23-fixing groove; 24-power motor; 25-gear box; 26-installation part; 27-transmission space;

[0041] 28-motor shaft; 29-power spindle; 30-fixing rod; 31-fixing hole; 32-box body;

[0042] 33-box cover; 34-through hole; 35-limiting table; 36-bearing; 37-driving gear;

[0043] 38-driven gear; 39-rotating wheel; 40-guide plate; 41-chain; 42-hole column. DETAILED DESCRIPTION

[0044] The utility model will be further described in combination with specific embodiments:

[0045] The utility model belongs to chain saw technical field, especially chain saw's brake structure, including chain saw body 1, the power motor 24 of setting in chain saw body 1, the control switch 3 of controlling power motor 24 work, control switch 3 mainly user control chain saw body 1 in power motor 24 whether can normally work, and chain saw body 1 is rotationally provided with the guard 2, the guard 2 can play the protection function, is the protection device that most chain saws on market have, and the control lug 4 of guard 2 bottom and the clamping lug 5 are set in chain saw body 1, and the operator can decide whether control lug 4 triggers control switch 3 by rotating guard 2, when control lug 4 and control switch 3 contact, make control switch 3 be in starting state, power motor 24 in chain saw body 1 can work normally, and because the damping assembly 7 in chain saw body 1 includes damping spring 11 and the damping top block 12 of abutting with damping spring 11, and the clamping lug 5 is provided with first clamping groove 8 and second clamping groove 9, when control lug 4 and control switch 3 contact, the top end of damping top block 12 is set in first clamping groove 8 and clamping lug 5 is clamped, under the driving force of damping spring 11, thereby limit clamping lug 5 automatically rotates, make guard 2 not automatically rotate forward under the action of external force, power motor 24 can work normally, the operator in the process of using chain saw, control lug 4 can not be separated from control switch 3, make power motor 24 in chain saw body 1 keep working state, make the operator in the process of normally using chain saw chain saw not suddenly stop working, will not affect the normal work of operator, when the operator needs chain saw emergency stop working, the operator can push guard 2 forward at this moment, make guard 2 rotate forward, control lug 4 will be separated from control switch 3, make control switch 3 close, thereby make power motor 24 stop working immediately, and at the same time, the clamping lug 5 on guard 2 will rotate backward, clamping lug 5 will exert downward pressure on damping top block 12, make damping top block 12 separate from first clamping groove 8, and at the same time, damping spring 11 will enter compression state, when the second clamping groove 9 on guard 2 rotates to a certain angle along with guard 2, the position of damping top block 12 will correspond with the position of second clamping groove 9, at this moment, the compressed damping spring 11 will push damping top block 12 to move upward, thereby make damping top block 12 enter second clamping groove 9 and clamping lug 5 are clamped, make guard 2 not automatically rotate backward, compared with the chain saw on market, adopts brake reset leaf spring to limit guard 2 rotation, the elasticity of this brake reset leaf spring is poor, and when long time deformation occurs, the elasticity of brake reset leaf spring will weaken, thereby lead to guard 2 to be easy to shake, make the safety of chain saw greatly reduce, and its manufacturing process is troublesome, the scrap rate is higher, the utility model restricts guard 2 rotation through damping top block 12 clamping into first clamping groove 8 or second clamping groove 9, this kind of structure that restricts guard 2 rotation is more stable and firm,Thus, the protective plate 2 cannot rotate by itself without external force, the protective plate 2 cannot shake, and the protective plate 2 does not produce a shaking sound during the operation of the chain saw. The unstable clamping between the damping top block 12 and the clamping protrusion 5 causes the protective plate 2 to rotate by itself and trigger the control switch 3. If the operator accidentally touches the control switch 3, the chain saw will start working directly, which may cause personal injury. The safety of the chain saw is greatly improved. Compared with the brake return plate spring, the brake return plate spring needs to be heated, bent, molded, and cooled to be produced, which results in a high scrap rate. The damping spring 11 is a common strong spring on the market, which has good elasticity and fatigue resistance. Thus, the elasticity of the damping spring 11 does not weaken after a long time of deformation. The production process of the damping spring 11 is very mature, which greatly reduces the production scrap rate of the damping spring 11.

[0046] Preferably, the chain saw body 1 is provided with a mounting groove 10, the damping spring 11 and the damping top block 12 are arranged in the mounting groove 10, the two ends of the damping spring 11 are respectively in abutment with the bottom of the mounting groove 10 and the damping top block 12, the top end of the damping top block 12 is provided with a damping protrusion 13, and the first clamping groove 8 and the second clamping groove 9 can be clamped with the damping protrusion 13 respectively. The damping spring 11 and the damping top block 12 are arranged in the mounting groove 10 of the chain saw body 1, which can prevent the damping top block 12 from moving randomly in the chain saw body 1, so that the damping top block 12 can be clamped with the clamping protrusion 5 at any time, thereby preventing the protective plate 2 from shaking. The mounting groove 10 facilitates the workers to assemble the damping assembly 7. The workers only need to place the damping spring 11 and the damping top block 12 in the mounting groove 10. When the damping top block 12 moves inward along the mounting groove 10, the damping spring 11 can be normally compressed. When the power motor 24 in the chain saw body 1 works normally, the damping protrusion 13 is located in the first clamping groove 8. When the power motor 24 in the chain saw body 1 cannot work normally, the damping protrusion 13 is located in the second clamping groove 9. The damping protrusion 13 ensures that the damping top block 12 can be clamped with the clamping protrusion 5.

[0047] Preferably, the bottom of the damping top block 12 is provided with an abutment groove 16, and one end of the damping spring 11 is arranged in the abutment groove 16 and abuts against the damping top block 12. The abutment groove 16 can better limit the movement of the damping spring 11 in the mounting groove 10, so that the damping spring 11 can be in abutment with the damping top block 12 at any time.

[0048] Preferably, the inner wall on both sides of the first clamping groove 8 and the second clamping groove 9 is provided with a clamping inclined surface 17, and the both sides of the damping protrusion 13 are provided with a guide inclined surface 18 matched with the clamping inclined surface 17; the guide inclined surface 18 on both sides of the damping protrusion 13 is matched with the clamping inclined surface 17 on the inner wall of the first clamping groove 8 or the second clamping groove 9, so that the damping protrusion 13 can be more smoothly separated from the first clamping groove 8 or the second clamping groove 9, thereby making the operator more relaxed when rotating the protective plate 2.

[0049] Preferably, the chain saw body 1 is further provided with a cover plate 19 covering the mounting groove 10, the cover plate 19 is provided with a connecting portion 20, the chain saw body 1 is provided with a hole column 42, the connecting portion 20 is provided with a connecting hole 21, and the connecting hole 21 and the hole column 42 are provided with a connecting rod 22; the cover plate 19 is fixedly installed in the chain saw body 1 through the connecting rod 22 in the connecting hole 21 and the hole column 42, and the main function of the cover plate 19 is to cover the damping assembly 7 in the mounting groove 10 in the mounting groove 10, so as to avoid the damping assembly 7 from being separated from the mounting groove 10, and make the damping protrusion 13 on the damping top block 12 keep clamping with the clamping protrusion 5, so that the brake function of the chain saw can be normally used.

[0050] Preferably, the chain saw body 1 is provided with a fixing groove 23, and the control switch 3 is arranged in the fixing groove 23; the fixing groove 23 can fix the control switch 3 in the chain saw body 1, thereby limiting the control switch 3 from moving randomly in the chain saw body 1.

[0051] Preferably, the chain saw body 1 is provided with a gear box 25, the gear box 25 is integrally formed with a mounting portion 26, the mounting portion 26 is sleeved on the power motor 24, the gear box 25 forms a transmission space 27, the power motor 24 is provided with a motor shaft 28, the motor shaft 28 is located in the transmission space 27, the gear box 25 is rotatably provided with a power main shaft 29 and a transmission gear assembly, and the transmission gear assembly is connected with the power main shaft 29 and the motor shaft 28 at both ends; compared with the motor support used to fix the motor and the gear box 25 together on the market, the mounting portion 26 on the gear box 25 is directly sleeved on the power motor 24, so that the gear box 25 and the power motor 24 are directly connected together without the motor support, the production cost of the chain saw can be reduced, and the installation is more convenient; and the motor shaft 28 on the power motor 24 is located in the transmission space 27 of the gear box 25, the power main shaft 29 and the motor shaft 28 in the transmission space 27 are connected through the transmission gear assembly, so that when the motor shaft 28 rotates, the power main shaft 29 can be driven to rotate smoothly through the transmission gear assembly, and the chain saw can be normally used.

[0052] Preferably, the power motor 24 is provided with a fixing rod 30, the mounting part 26 is provided with a fixing hole 31, the fixing rod 30 is arranged in the fixing hole 31 and fixedly connected with the mounting part 26; the mounting part 26 is fixedly connected with the power motor 24 through the fixing rod 30 arranged in the fixing hole 31, and the number of the fixing rod 30 and the fixing hole 31 is multiple, so that the mounting part 26 is more stably and firmly connected with the power motor 24.

[0053] Preferably, the gear box 25 comprises a box body 32 and a box cover 33 covering the box body 32, the transmission gear assembly is arranged in the box body 32, the box cover 33 is provided with a through hole 34, the power main shaft 29 passes through the through hole 34 and is exposed outside the gear box 25, the inner wall of the through hole 34 is provided with a limiting table 35, the power main shaft 29 is sleeved with a bearing 36, the bearing 36 is located in the through hole 34, and the top end of the bearing 36 abuts against the limiting table 35; the through hole 34 on the box cover 33 enables the power main shaft 29 to be smoothly exposed outside the gear box 25, and the top end of the bearing 36 sleeved on the power main shaft 29 abuts against the limiting table 35 on the inner wall of the through hole 34, so that the bearing 36 can be effectively limited from moving upward in the process of rotation of the power main shaft 29, so that the condition of disengagement from the power main shaft 29 does not occur, and the arrangement of the bearing 36 enables the power main shaft 29 to rotate more smoothly, can greatly reduce the frictional force generated in the process of rotation of the power main shaft 29, so that the power main shaft 29 is not easy to wear and tear, and the service life of the power main shaft 29 is increased.

[0054] Preferably, the transmission gear assembly comprises a driving gear 37 and a driven gear 38 engaged with the driving gear 37, the driven gear 38 is sleeved on the power spindle 29 and fixedly connected with the power spindle 29, the driving gear 37 is sleeved on the motor shaft 28 and fixedly connected with the motor shaft 28, one end of the power spindle 29 is arranged outside the chain saw body 1, the power spindle 29 is provided with a rotating wheel 39, the chain saw body 1 is provided with a guide plate 40, the guide plate 40 is provided with a chain 41, one end of the chain 41 is sleeved on the rotating wheel 39; the guide plate 40, the chain 41 and the rotating wheel 39 are a common structure on the chain saw on the market, the transmission gear assembly is composed of the driving gear 37 and the driven gear 38, when the motor shaft 28 rotates, the driving gear 37 fixedly connected with the motor shaft 28 is driven to rotate, the driving gear 37 and the driven gear 38 are engaged with each other, when the driving gear 37 rotates, the driven gear 38 is driven to rotate, since the driven gear 38 is sleeved on the power spindle 29 and fixedly connected with the power spindle 29, when the driven gear 38 rotates, the power spindle 29 is smoothly driven to rotate, and the rotating wheel 39 is arranged on the end of the power spindle 29 exposed outside the chain saw body 1, and one end of the chain 41 on the guide plate 40 is sleeved on the rotating wheel 39, when the power spindle 29 rotates, the rotating wheel 39 is driven to rotate, the rotating wheel 39 drives the chain 41 to rotate around the guide plate 40, so that the chain saw can work normally.

[0055] The above embodiments are only preferred embodiments of the utility model, and do not limit the protection scope of the utility model, so that: all equivalent changes made according to the structure, shape, principle of the utility model should be covered in the protection scope of the utility model.

Claims

1. A brake structure of a chain saw, comprising a chain saw body (1), a power motor (24) arranged in the chain saw body (1), a control switch (3) for controlling the operation of the power motor (24), and a protective plate (2) rotatably arranged on the chain saw body (1), characterized in that: The bottom of the guard plate (2) is arranged in the chain saw body (1) and is provided with a control protrusion (4) and a clamping protrusion (5). The rotation of the guard plate (2) can control the start or stop of the control switch (3) through the control protrusion (4) at the bottom of the guard plate (2). The clamping protrusion (5) is provided with a first clamping groove (8) and a second clamping groove (9). The chain saw body (1) is further provided with a damping assembly (7). The damping assembly (7) comprises a damping spring (11) and a damping top block (12) abutting against the damping spring (11). When the top end of the damping top block (12) is arranged in the first clamping groove (8), the damping top block (12) moves inward and compresses the damping spring (11) after the rotation of the guard plate (2). When the second clamping groove (9) on the guard plate (2) rotates to a position corresponding to the damping top block (12), the compressed damping spring (11) pushes the damping top block (12) out of the first clamping groove (8) and into the second clamping groove (9), thereby limiting the rotation of the guard plate (2).

2. The chain saw brake structure according to claim 1, characterized in that: The chain saw body (1) is provided with a mounting groove (10). The damping spring (11) and the damping top block (12) are arranged in the mounting groove (10). The two ends of the damping spring (11) abut against the bottom of the mounting groove (10) and the damping top block (12), respectively. The top end of the damping top block (12) is provided with a damping protrusion (13). The first clamping groove (8) and the second clamping groove (9) can be clamped with the damping protrusion (13), respectively.

3. The chain saw brake structure according to claim 2, characterized in that: The bottom of the damping top block (12) is provided with an abutting groove (16). One end of the damping spring (11) is arranged in the abutting groove (16) and abuts against the damping top block (12).

4. The chain saw brake structure according to claim 2, characterized in that: The inner walls on both sides of the first clamping groove (8) and the second clamping groove (9) are provided with clamping inclined surfaces (17). The two sides of the damping protrusion (13) are provided with guide inclined surfaces (18) matched with the clamping inclined surfaces (17).

5. The chain saw brake structure according to claim 2, characterized in that: The chain saw body (1) is further provided with a cover plate (19) covering the mounting groove (10). The cover plate (19) is provided with a connecting portion (20). The chain saw body (1) is provided with a hole column (42). The connecting portion (20) is provided with a connecting hole (21). The connecting hole (21) and the hole column (42) are provided with a connecting rod (22).

6. The brake structure of a chain saw according to any one of claims 1 to 5, characterized in that: The chain saw body (1) is provided with a fixing groove (23). The control switch (3) is arranged in the fixing groove (23).

7. The brake structure of a chain saw according to any one of claims 1 to 5, characterized in that: The chain saw body (1) is provided with a gear box (25). The gear box (25) is integrally formed with a mounting portion (26). The mounting portion (26) is sleeved on a power motor (24). The gear box (25) forms a transmission space (27) therein. The power motor (24) is provided with a motor shaft (28). The motor shaft (28) is located in the transmission space (27). The gear box (25) is rotatably provided with a power main shaft (29) and a transmission gear assembly. The two ends of the transmission gear assembly are connected with the power main shaft (29) and the motor shaft (28), respectively.

8. The chain saw brake structure according to claim 7, characterized in that: The power motor (24) is provided with a fixing rod (30), the mounting part (26) is provided with a fixing hole (31), and the fixing rod (30) is arranged in the fixing hole (31) and fixedly connected with the mounting part (26).

9. The chain saw brake structure according to claim 7, characterized in that: The gear box (25) comprises a box body (32) and a box cover (33) covering the box body (32), the transmission gear assembly is arranged in the box body (32), the box cover (33) is provided with a through hole (34), the power main shaft (29) passes through the through hole (34) and is exposed outside the gear box (25), the inner wall of the through hole (34) is provided with a limiting table (35), the power main shaft (29) is provided with a bearing (36), the bearing (36) is located in the through hole (34), and the top end of the bearing (36) abuts against the limiting table (35).

10. The brake structure of a chain saw according to claim 7, wherein: The transmission gear assembly comprises a driving gear (37) and a driven gear (38) engaged with the driving gear (37), the driven gear (38) is sleeved on the power main shaft (29) and fixedly connected with the power main shaft (29), the driving gear (37) is sleeved on the motor shaft (28) and fixedly connected with the motor shaft (28), one end of the power main shaft (29) is arranged outside the chain saw body (1), the power main shaft (29) is provided with a rotating wheel (39), the chain saw body (1) is provided with a guide plate (40), the guide plate (40) is annularly provided with a chain (41), and one end of the chain (41) is sleeved on the rotating wheel (39).

Images