Linkage accelerator mechanism and engine

Abstract

The utility model provides a linkage accelerator mechanism, which comprises a mounting plate, a connecting plate and an accelerator, and the control mechanism comprises a handle rotationally arranged on the mounting plate, a shifting fork shaft in transmission connection with the handle and a shifting fork fixedly arranged on the shifting fork shaft, and the shifting fork is connected with the fuel injection pump so that the shifting fork shaft can be driven to rotate through the handle, and the fuel supply amount of the fuel injection pump can be adjusted through the shifting fork shaft. The utility model further provides an engine which comprises the linkage accelerator mechanism and the speed regulating mechanism. According to the linkage accelerator mechanism, the shifting fork shaft is driven to rotate through the handle, so that the shifting fork is driven to adjust the oil supply amount of the oil injection pump, accelerator control over an engine is achieved, the complexity of the structure is simplified, cost is low, and maintenance and replacement are easier.

Description

Technical Field

[0001] The utility model relates to the technical field of internal combustion engines, in particular to a linkage throttle mechanism and an engine. Background Art

[0002] Lawn mowers, snowplows, micro-tillers and other power equipment generally use internal combustion engines. The throttle control device is an important component of the internal combustion engine. It has a great influence on the performance of the engine. It mainly adjusts the position of the throttle speed control arm to adjust the fuel supply of the injection pump, thereby achieving the purpose of controlling the engine speed.

[0003] With the development of science and technology and the progress of agriculture, electronic shift fork speed regulation has emerged in the prior art as the engine speed regulation mechanism. It controls the opening of the engine throttle through a solenoid valve and a transmission mechanism to adjust the engine power, so that the fuel engine can adjust the speed according to the user load and working conditions during operation, and the speed change is more precise and intelligent. However, its structure is complex and the cost and maintenance are high, and its practicality is not strong. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a linkage throttle mechanism and an engine to solve the technical problems in the prior art that the engine using an electronic shift fork speed regulation as a speed regulation mechanism has a complex structure, high cost and maintenance, and poor practicality.

[0005] The first aspect of the utility model provides a linkage throttle mechanism, comprising:

[0006] A mounting plate, arranged on the engine;

[0007] The control mechanism includes a handle rotatably arranged on the mounting plate, a fork shaft transmission-connected to the handle, and a fork fixedly arranged on the fork shaft, wherein the fork is connected to the fuel injection pump so that the fork shaft is driven to rotate by the handle to adjust the fuel supply of the fuel injection pump.

[0008] Furthermore, a fixing rod is rotatably provided on the mounting plate, one of the opposite ends of the fixing rod passes through the mounting plate and is connected to the handle, and the other end is connected to a rotating arm; one end of the fork shaft is rotatably provided on the mounting plate, and a speed regulating arm is fixedly provided on the fork shaft, and the speed regulating arm and the rotating arm are connected by a tension spring.

[0009] Furthermore, a torsion spring is provided between the mounting plate and the rotating arm, and the torsion spring is sleeved on the outer surface of the fixing rod.

[0010] Furthermore, the handle is provided with an arc groove, the mounting plate is provided with a stud, and the stud is slidably connected in the arc groove.

[0011] Furthermore, two limiting bolts are arranged on the mounting plate, and the two limiting bolts are respectively located on both sides of the handle.

[0012] Furthermore, it also includes a flameout mechanism, which includes a flameout switch, a reset component and a transmission component, one end of the flameout switch passes through the mounting plate and is rotatably connected thereto, the reset component is sleeved on the flameout switch, and two ends of the reset component are respectively connected to the mounting plate and the transmission component, one end of the transmission component is mounted on the flameout switch and located outside the reset component, and the transmission component is rotatably connected to the mounting plate so as to be driven by the flameout switch to abut against the shift fork to shut down the fuel injection pump.

[0013] Furthermore, the reset component includes a reset spring, which is sleeved on the ignition off switch, and two ends of the reset spring are respectively abutted against the mounting plate and the transmission component; the transmission component includes a support arm, which is mounted on the ignition off switch and is located on the outside of the reset spring, so as to drive it to abut against the fork through the ignition off switch to shut down the fuel injection pump.

[0014] Furthermore, it also includes a limiting mechanism, which includes an outer stud and an inner stud, the outer stud is arranged on the engine, and a central through hole is arranged inside the outer stud, the central through hole is elastically connected to the inner stud, and one end of the inner stud abuts against the speed regulating arm to limit the rotation angle of the speed regulating arm.

[0015] The second aspect of the utility model provides an engine, including the linked throttle mechanism and speed regulating mechanism as described above, the speed regulating mechanism including a speed regulating gear, a speed regulating flyweight rotatably connected to the speed regulating gear, a speed regulating shaft arranged on the speed regulating gear, and a speed regulating push plate sleeved on the speed regulating shaft, the speed regulating push plate is connected to the shift fork shaft, and the speed regulating gear is used for transmission connection with the camshaft.

[0016] Furthermore, an adjusting block is provided on the shift fork shaft, and one end of the speed regulating push plate which is away from the speed regulating gear abuts against the adjusting block.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The linked throttle mechanism of the utility model drives the fork shaft to rotate through the handle, thereby driving the fork to adjust the fuel supply of the injection pump, thereby realizing throttle control of the engine, simplifying the complexity of the structure, reducing the cost, and making maintenance and replacement easier.

[0019] The linkage throttle mechanism of the present utility model, through a flameout mechanism composed of a flameout switch, a reset component, and a transmission component, not only simplifies the operation process and reduces the operation burden of the user during the continuous use of the diesel engine, but also greatly facilitates the next start of the diesel engine by keeping the flameout switch in the normally open state, enabling the engine to quickly restart even in an emergency, thus meeting the requirements of an efficient working environment.

[0020] The linkage throttle mechanism of the present utility model effectively prevents the speed regulating arm from exceeding the maximum rotation angle to limit the maximum speed through the elastic abutment of the limiting mechanism, protects the engine and other related components from over-speed damage, and provides a smoother and continuous adjustment effect, making the speed regulation more accurate.

[0021] The engine of the present utility model realizes the automatic adjustment of the engine speed and the automatic adjustment of the lubrication mechanism through the combination of an adjustment mechanism composed of a speed regulating gear, a speed regulating flyweight, a speed regulating shaft, and a speed regulating push plate and the linkage throttle mechanism. Brief Description of the Drawings

[0022] Figure 1 Structural schematic of the linkage throttle mechanism according to an embodiment of the present utility model Figure 1 ;

[0023] Figure 2 Structural schematic of the linkage throttle mechanism according to an embodiment of the present utility model Figure 2 ;

[0024] Figure 3 Structural schematic of the linkage throttle mechanism according to an embodiment of the present utility model Figure 3 ;

[0025] Figure 4 Schematic diagram of the transmission structure of the linkage throttle mechanism and the speed regulating mechanism in the engine according to an embodiment of the present utility model;

[0026] Figure 5 Structural schematic of the speed regulating mechanism in the engine according to an embodiment of the present utility model Figure 1 ;

[0027] Figure 6 Structural schematic of the speed regulating mechanism in the engine according to an embodiment of the present utility model Figure 2 ;

[0028] Explanation of the reference numerals in the drawings:

[0029] 10. Mounting plate; 11. Stud;

[0030] 20. Control mechanism; 21. Handle; 211. Arc-shaped groove; 22. Fork shaft; 23. Fork; 24. Fixed rod; 25. Rotating arm; 26. Speed regulating arm; 27. Tension spring; 28. Torsion spring; 29. Limit bolt;

[0031] 30, Flameout mechanism; 31, Flameout switch; 32, Reset component; 33, Transmission component;

[0032] 40, Limiting mechanism; 41, External stud; 42, Internal stud;

[0033] 50, Speed regulation mechanism; 51, Speed regulation gear; 52, Speed regulation flyweight; 53, Speed regulation shaft; 54, Speed regulation push plate; 55, Adjusting block;

[0034] 60, Fuel injection pump; 70, Camshaft.

[0035] The realization, functional features and advantages of the purpose of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0036] In order to make the purpose, technical solutions and beneficial effects of the present utility model clearer, the technical solutions in the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0037] In the description of the present utility model, it should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those who are familiar with this technology to understand and read, and are not used to limit the limited conditions under which the present utility model can be implemented. Therefore, they do not have any technical essence. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope that the technical content disclosed in the present utility model can cover. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of clear description and are not used to limit the scope that the present utility model can be implemented. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope that the present utility model can be implemented.

[0038] Embodiment 1

[0039] As Figures 1-3As shown, an embodiment of the utility model provides a linkage throttle mechanism, including a mounting plate 10 and a control mechanism 20 arranged on the engine; the control mechanism 20 includes a handle 21 rotatably arranged on the mounting plate 10, a fork shaft 22 transmission-connected to the handle 21, and a fork 23 fixedly arranged on the fork shaft 22, the fork 23 is connected to the fuel injection pump 60, so as to drive the fork shaft 22 to rotate through the handle 21, so as to adjust the fuel supply of the fuel injection pump 60; specifically, the fuel injection pump 60 includes an adjusting ball head for adjusting the sprayed oil amount, and the fork 23 is provided with a U-shaped groove for accommodating the adjusting ball head.

[0040] In the embodiment of the utility model, the operator adjusts the speed or power of the engine as needed by rotating the handle 21 installed on the mounting plate 10. The handle 21 drives the fork shaft 22 to rotate. When the handle 21 rotates, it drives the fork shaft 22 to rotate through a mechanical connection (such as a gear, a connecting rod, etc.). The rotation of the fork shaft 22 will drive the fork 23 fixed thereon to move. The position change of the fork 23 directly affects the fuel supply adjustment mechanism of the injection pump 60. When the fork 23 moves, it will push or pull the adjustment mechanism of the injection pump 60, change the effective stroke of the plunger of the injection pump 60, and thus adjust the fuel supply of the injection pump 60. When the fuel supply increases, the injection pump 60 delivers more fuel to the combustion chamber; when the fuel supply decreases, the amount of fuel delivered by the injection pump 60 decreases. As the fuel supply of the injection pump 60 changes, the combustion efficiency and output power of the engine will also change accordingly. When the fuel supply increases, the engine output power increases and the speed increases; when the fuel supply decreases, the engine output power decreases and the speed decreases.

[0041] Specifically, Figures 1-3As shown, in the embodiment of the present utility model, a fixing rod 24 is rotatably arranged on the mounting plate 10. One end of the opposite ends of the fixing rod 24 passes through the mounting plate 10 to connect the handle 21, and the other end is connected with a swing arm 25. One end of the fork shaft 22 is rotatably arranged on the mounting plate 10, and a speed regulating arm 26 is fixedly arranged on the fork shaft 22. The speed regulating arm 26 and the swing arm 25 are connected by a tension spring 27. The operator adjusts the engine speed or power as needed by rotating the handle 21 mounted on the fixing rod 24. When the handle 21 rotates, the fixing rod 24 rotates accordingly. One end of the fixing rod 24 drives the handle 21, and the other end drives the swing arm 25. The rotation of the fixing rod 24 causes the swing arm 25 to move. The position change of the swing arm 25 will stretch or compress the tension spring 27. The tension spring 27 is connected between the speed regulating arm 26 and the swing arm 25. When the swing arm 25 moves, the tension spring 27 will provide a reverse pulling force, causing the speed regulating arm 26 to rotate following the movement of the swing arm 25. The tension of the tension spring 27 can ensure that when there is no external force, the handle 21 and the fork shaft 22 can automatically return to the initial position (usually the idle position). And since the speed regulating arm 26 is fixed on the fork shaft 22, the rotation of the speed regulating arm 26 will drive the fork shaft 22 to rotate. The fork 23 is fixed on the fork shaft 22. Along with the rotation of the fork shaft 22, the fork 23 will also move. The movement of the fork 23 will push or pull the regulating mechanism of the fuel injection pump 60, changing the effective stroke of the plunger of the fuel injection pump 60, thereby adjusting the fuel supply amount of the fuel injection pump 60. That is, when the fuel supply amount increases, the fuel injection pump 60 delivers more fuel into the combustion chamber; when the fuel supply amount decreases, the fuel injection amount delivered by the fuel injection pump 60 decreases. Along with the change of the fuel supply amount of the fuel injection pump 60, the combustion efficiency and output power of the engine will also change accordingly. When the fuel supply amount increases, the engine output power increases and the speed increases; when the fuel supply amount decreases, the engine output power decreases and the speed decreases. When the handle 21 is released, the restoring force of the tension spring 27 will cause the handle 21, the fixing rod 24, the swing arm 25, the fork shaft 22 and the fork 23 to return to the initial position, ensuring that the engine returns to the idle state or other predetermined working states.

[0042] Specifically, as Figures 1-3 shown, in the embodiment of the present utility model, a torsion spring 28 is arranged between the mounting plate 10 and the swing arm 25. The torsion spring 28 is sleeved on the outer surface of the fixing rod 24. When the swing arm 25 moves, the torsion spring 28 will provide a reverse torque, enabling the swing arm 25 to stably follow the rotation of the fixing rod 24. The torque of the torsion spring 28 can ensure that when there is no external force, the handle 21 and the fork shaft 22 can automatically return to the initial position (usually the idle position).

[0043] Specifically, as Figure 1As shown, in the embodiment of the present utility model, an arc-shaped groove 211 is provided on the handle 21, and a stud 11 is provided on the mounting plate 10. The stud 11 is slidably connected within the arc-shaped groove 211. The maximum rotation angle of the handle 21 is restricted by the cooperation of the stud 11 and the arc-shaped groove 211, such that the handle 21 can only move within the range of the arc-shaped groove 211, thereby enabling the rotation angle of the shift fork shaft 22 to be controlled. Meanwhile, the handle 21 can be fixed on the mounting plate 10 in cooperation with a disc spring nut to restrict its rotation speed and avoid speed changes caused by misoperation.

[0044] Specifically, as Figure 1 shown, in the embodiment of the present utility model, two limit bolts 29 are provided on the mounting plate 10. The two limit bolts 29 are respectively located on both sides of the handle 21. By abutting the two limit bolts 29 against the handle 21, the moving distance of the handle 21, that is, the rotation angle of the handle 21, is further restricted to maintain the rotation speed unchanged.

[0045] Based on the above solution, as Figures 1-3 shown, in the embodiment of the present utility model, an engine shutdown mechanism 30 is further included. The engine shutdown mechanism 30 includes an engine shutdown switch 31, a reset member 32, and a transmission member 33. One end of the engine shutdown switch 31 passes through the mounting plate 10 and is rotatably connected thereto. The reset member 32 is sleeved on the engine shutdown switch 31, and both ends of the reset member 32 are respectively connected to the mounting plate 10 and the transmission member 33. One end of the transmission member 33 is mounted on the engine shutdown switch 31 and is located outside the reset member 32, and the transmission member 33 is rotatably connected to the mounting plate 10, so as to drive it to abut against the shift fork 23 through the engine shutdown switch 31 to close the fuel injection pump 60. When the diesel engine is in operation, the operator drives the transmission member 33 by toggling (closing) the engine shutdown switch 31. The transmission member 33 will rotate on the mounting plate 10 and drive the adjusting ball head to rotate, thereby achieving the purpose of closing the fuel injection pump 60, stopping the fuel supply of the diesel engine, and making the diesel engine stop operating. During this process, the reset member 32 will be twisted when the transmission member 33 moves; after the diesel engine stops operating, when the engine shutdown switch 31 is released, the reset member 32 in a twisted state has elasticity and will drive the engine shutdown switch 31 to rotate to drive the transmission member 33, so that the engine shutdown switch 31 automatically resets to the open state. This not only simplifies the operation process and reduces the operation burden of the user during the continuous use of the diesel engine, but also greatly facilitates the next start of the diesel engine by keeping the engine shutdown switch 31 in the normally open state, enabling the engine to be quickly restarted in an emergency, thus meeting the requirements of an efficient working environment.

[0046] Specifically, as Figures 1-3As shown, in the embodiment of the utility model, the reset component 32 includes a reset spring, which is sleeved on the flameout switch 31, and the two ends of the reset spring are respectively in contact with the mounting plate 10 and the transmission component 33. When the external force disappears, the reset force of the reset spring will return the flameout switch 31 and the transmission component 33 to the initial position for the next operation; the transmission component 33 includes a support arm, which is installed on the flameout switch 31 and is located on the outside of the reset spring, so that it can be driven by the flameout switch 31 to abut against the fork 23 to turn off the injection pump 60. When the flameout switch 31 is activated, the support arm will rotate with the flameout switch 31, and the rotation of the support arm will drive the fork 23 to move, so that it will turn off the injection pump 60 and stop the fuel supply, thereby ensuring that the engine returns to the idle state or stops completely.

[0047] Based on the above scheme, if Figures 1-3 As shown, in the embodiment of the utility model, a limiting mechanism 40 is also included, and the limiting mechanism 40 includes an outer stud 41 and an inner stud 42. The outer stud 41 is arranged on the engine, and a central through hole is arranged inside the outer stud 41, and the central through hole is elastically connected to the inner stud 42. One end of the inner stud 42 abuts against the speed regulating arm 26 to limit the rotation angle of the speed regulating arm 26. When the speed regulating arm 26 rotates to a point close to the maximum set angle, the speed regulating arm 26 will contact the inner stud 42, and the inner stud 42 abuts against the end of the speed regulating arm 26 away from the tension spring 27 through the elastic element, providing additional resistance to prevent the speed regulating arm 26 from continuing to rotate. The elastic force of the elastic element enables the inner stud 42 to smoothly abut against the speed regulating arm 26, avoiding the impact and damage that may be caused by the hard limit. As the speed regulating arm 26 continues to try to rotate, the elastic element will be further compressed to increase the resistance until the maximum set angle is reached, so as to automatically adjust the engine speed fluctuation and minimize the speed fluctuation range.

[0048] Example 2

[0049] like Figures 4-6 As shown, an embodiment of the utility model provides an engine, including a linked throttle mechanism and a speed regulating mechanism 50 as described in the above-mentioned embodiment 1, wherein the specific structure of the linked throttle mechanism refers to the above-mentioned embodiment 1. Since the present engine adopts all the technical solutions of the above-mentioned embodiment 1, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiment 1, which will not be described one by one here.

[0050] Specifically, the speed regulating mechanism 50 includes a speed regulating gear 51, a speed regulating flyweight 52 rotatably connected to the speed regulating gear 51, a speed regulating shaft 53 arranged on the speed regulating gear 51, and a speed regulating push plate 54 sleeved on the speed regulating shaft 53, wherein the speed regulating push plate 54 is connected to the fork shaft 22, and the speed regulating gear 51 is used for transmission connection with the camshaft 70; specifically, an adjusting block 55 is installed on the fork shaft 22, and one end of the speed regulating push plate 54 away from the speed regulating gear 51 abuts against the adjusting block 55. When the engine speed increases, the speed regulating gear 51 rotates with the rotation of the camshaft 70, and opens outwards due to the action of centrifugal force, and the opening action of the speed regulating flyweight 52 is controlled by the speed regulating shaft 55. 3 is transmitted to the speed regulating push plate 54, the speed regulating push plate 54 pushes the regulating block 55 on the fork shaft 22, and then drives the fork shaft 22 to rotate, the fork 23 moves with the rotation of the fork shaft 22, adjusts the oil supply of the injection pump 60, reduces the fuel supply, and thus reduces the engine speed, on the contrary, when the engine speed decreases, the speed regulating fly block 52 retracts inward, the speed regulating push plate 54 moves in the reverse direction, and pushes the regulating block 55 to move in the reverse direction, increases the fuel supply, and increases the engine speed, thereby realizing automatic adjustment of the oil pressure and flow rate with the engine speed, and achieving the purpose of speed regulation, wherein when the speed regulating fly block 52 opens outward under the action of centrifugal force, it also drives the lubricating oil to splash into the crankshaft oil channel with the rotation of the speed regulating fly block 52.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than a barrier. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A linkage throttle mechanism, characterized in that, Comprising: A mounting plate (10), arranged on the engine; A control mechanism (20), including a handle (21) rotatably arranged on the mounting plate (10), a shift fork shaft (22) in transmission connection with the handle (21), and a shift fork (23) fixedly arranged on the shift fork shaft (22), the shift fork (23) being connected to a fuel injection pump (60) to drive the shift fork shaft (22) to rotate through the handle (21) so as to adjust the fuel supply amount of the fuel injection pump (60); a fixing rod (24) is rotatably arranged on the mounting plate (10), one end of the opposite ends of the fixing rod (24) passes through the mounting plate (10) to connect the handle (21), and the other end is connected with a swing arm (25); one end of the shift fork shaft (22) is rotatably arranged on the mounting plate (10), and a speed regulating arm (26) is fixedly arranged on the shift fork shaft (22), and the speed regulating arm (26) and the swing arm (25) are connected by a tension spring (27).

2. The linkage throttle mechanism according to claim 1, wherein, A torsion spring (28) is arranged between the mounting plate (10) and the swing arm (25), and the torsion spring (28) is sleeved on the outer surface of the fixing rod (24).

3. The linkage throttle mechanism according to claim 1, characterized in that, An arc-shaped groove (211) is arranged on the handle (21), and a stud (11) is arranged on the mounting plate (10), and the stud (11) is slidably connected in the arc-shaped groove (211).

4. The linkage throttle mechanism according to claim 1, characterized in that, Two limit bolts (29) are arranged on the mounting plate (10), and the two limit bolts (29) are respectively located on both sides of the handle (21).

5. The linkage throttle mechanism according to claim 1, characterized in that, It further includes a flameout mechanism (30), the flameout mechanism (30) includes a flameout switch (31), a reset component (32) and a transmission component (33), one end of the flameout switch (31) penetrates through the mounting plate (10) and is rotatably connected thereto, the reset component (32) is sleeved on the flameout switch (31), and both ends of the reset component (32) are respectively connected with the mounting plate (10) and the transmission component (33), one end of the transmission component (33) is mounted on the flameout switch (31) and is located outside the reset component (32), and the transmission component (33) is rotatably connected with the mounting plate (10) to drive it to abut against the shift fork (23) through the flameout switch (31) so as to close the fuel injection pump (60).

6. The linkage throttle mechanism according to claim 5, characterized in that, The reset component (32) includes a reset spring, the reset spring is sleeved on the flameout switch (31), and both ends of the reset spring respectively abut against the mounting plate (10) and the transmission component (33); the transmission component (33) includes a support arm, the support arm is mounted on the flameout switch (31) and is located outside the reset spring to drive it to abut against the shift fork (23) through the flameout switch (31) so as to close the fuel injection pump (60).

7. The linkage throttle mechanism according to claim 1, wherein The invention also comprises a limiting mechanism (40), wherein the limiting mechanism (40) comprises an outer stud (41) and an inner stud (42), wherein the outer stud (41) is arranged on the engine, and a central through hole is arranged inside the outer stud (41), wherein the central through hole is elastically connected to the inner stud (42), and one end of the inner stud (42) abuts against the speed regulating arm (26) to limit the rotation angle of the speed regulating arm (26).

8. An engine, characterized in that, It comprises a linked throttle mechanism and a speed regulating mechanism (50) as described in any one of claims 1 to 7 above, wherein the speed regulating mechanism (50) comprises a speed regulating gear (51), a speed regulating flyweight (52) rotatably connected to the speed regulating gear (51), a speed regulating shaft (53) arranged on the speed regulating gear (51), and a speed regulating push plate (54) sleeved on the speed regulating shaft (53), wherein the speed regulating push plate (54) is connected to the shift fork shaft (22), and the speed regulating gear (51) is used for transmission connection with a camshaft (70).

9. An engine according to claim 8, characterized in that, An adjusting block (55) is provided on the shift fork shaft (22), and one end of the speed regulating push plate (54) facing away from the speed regulating gear (51) abuts against the adjusting block (55).

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