Linkage accelerator mechanism and engine

Abstract

The invention provides a linkage accelerator mechanism, which comprises a mounting plate, a linkage mechanism and a control mechanism, 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 invention further provides an engine. The engine 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 present invention relates to the technical field of internal combustion engines, and 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. Summary of the invention

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

[0005] A first aspect of the present invention 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 present invention provides an engine, comprising a linked throttle mechanism and a speed regulating mechanism as described in any one of claims 6 to 8 above, wherein the speed regulating mechanism comprises 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, wherein 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 present invention has the following beneficial effects:

[0018] The linkage throttle mechanism of the present invention drives the fork shaft to rotate through the handle, thereby driving the fork to adjust the fuel supply of the injection pump, thereby realizing the 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 invention, which is 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 continuous use of the diesel engine, but also greatly facilitates the next start of the diesel engine by keeping the flameout switch in a normally open state, so that the engine can be quickly restarted in an emergency, thereby meeting the needs of an efficient working environment.

[0020] The linkage throttle mechanism of the present invention 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 overspeed damage, and provides a smoother and continuous adjustment effect, making the speed regulation more precise.

[0021] The engine of the present invention realizes automatic regulation of engine speed and lubrication mechanism through the combination of a regulating mechanism composed of a speed regulating gear, a speed regulating fly block, a speed regulating shaft and a speed regulating push plate and a linkage throttle mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The structure of the linkage throttle mechanism according to one embodiment of the present invention is shown in FIG. Figure 1 ;

[0023] Figure 2 The structure of the linkage throttle mechanism according to one embodiment of the present invention is shown in FIG. Figure 2 ;

[0024] Figure 3 The structure of the linkage throttle mechanism according to one embodiment of the present invention is shown in FIG. Figure 3 ;

[0025] Figure 4 It is a schematic diagram of the transmission structure of the linked throttle mechanism and the speed regulating mechanism in the engine according to one embodiment of the present invention;

[0026] Figure 5 The structure of the speed regulating mechanism in the engine of one embodiment of the present invention is shown in FIG. Figure 1 ;

[0027] Figure 6 The structure of the speed regulating mechanism in the engine of one embodiment of the present invention is shown in FIG. Figure 2 ;

[0028] Description of Figure Numbers:

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

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

[0031] 30. Flame-out mechanism; 31. Flame-out switch; 32. Reset component; 33. Transmission component;

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

[0033] 50. Speed ​​regulating mechanism; 51. Speed ​​regulating gear; 52. Speed ​​regulating fly block; 53. Speed ​​regulating shaft; 54. Speed ​​regulating push plate; 55. Adjusting block;

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

[0035] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and beneficial effects of the present invention more clearly understood, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0037] In the description of the present invention, it should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of the present specification are only used to match the contents disclosed in the specification for people familiar with the technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in the present specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of the relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0038] Example 1

[0039] like Figure 1-3 As shown, an embodiment of the present invention provides a linkage throttle mechanism, including a mounting plate 10 and a control mechanism 20 arranged on an 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 present invention, 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, Figure 1-3As shown, in the embodiment of the present invention, a fixing rod 24 is rotatably provided 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 to a rotating arm 25; one end of the fork shaft 22 is rotatably provided on the mounting plate 10, and a speed regulating arm 26 is fixedly provided on the fork shaft 22, and the speed regulating arm 26 and the rotating arm 25 are connected by a tension spring 27. The operator adjusts the speed or power of the engine as needed by rotating the fixing rod 24. The handle 21 is realized by the handle 21. When the handle 21 rotates, the fixed rod 24 rotates accordingly. One end of the fixed rod 24 drives the handle 21, and the other end drives the rotating arm 25. The rotation of the fixed rod 24 causes the rotating arm 25 to move. The position change of the rotating arm 25 will stretch or compress the tension spring 27. The tension spring 27 is connected between the speed regulating arm 26 and the rotating arm 25. When the rotating arm 25 moves, the tension spring 27 will provide a reverse pulling force, so that the speed regulating arm 26 rotates following the movement of the rotating 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 because 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, and the fork 23 is fixed on the fork shaft 22. 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 adjustment mechanism of the fuel injection pump 60, change the effective stroke of the plunger of the fuel injection pump 60, and thus adjust the fuel supply of the fuel injection pump 60, that is, when the fuel supply increases, the fuel injection pump 60 delivers more fuel to the combustion chamber. Fuel; 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; when the handle 21 is released, the restoring force of the tension spring 27 will cause the handle 21, the fixing rod 24, the rotating 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 state.

[0042] Specifically, Figure 1-3 As shown, in the embodiment of the present invention, a torsion spring 28 is arranged between the mounting plate 10 and the rotating arm 25, and the torsion spring 28 is sleeved on the outer surface of the fixing rod 24. When the rotating arm 25 moves, the torsion spring 28 provides a reverse torque so that the rotating arm 25 can 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, Figure 1As shown, in the embodiment of the present invention, an arc 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 in the arc groove 211. The maximum rotation angle of the handle 21 is limited by the cooperation between the stud 11 and the arc groove 211, so that the handle 21 can only move within the range of the arc groove 211, thereby controlling the rotation angle of the fork shaft 22. At the same time, the handle 21 can be fixed on the mounting plate 10 in cooperation with a butterfly nut to limit its rotation speed and avoid speed changes caused by misoperation.

[0044] Specifically, Figure 1 As shown, in an embodiment of the present invention, two limit bolts 29 are provided on the mounting plate 10, and the two limit bolts 29 are respectively located on both sides of the handle 21. The two limit bolts 29 abut against the handle 21 to further limit the moving distance of the handle 21, that is, to limit the rotation angle of the handle 21 to maintain the rotation speed unchanged.

[0045] Based on the above scheme, if Figure 1-3 As shown, in the embodiment of the present invention, a flameout mechanism 30 is further included, and 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 passes through the mounting plate 10 and is rotatably connected thereto. The reset component 32 is sleeved on the flameout switch 31, and the two ends of the reset component 32 are respectively connected to the mounting plate 10 and the transmission component 33. One end of the transmission component 33 is installed on the flameout switch 31 and is located outside the reset component 32. The transmission component 33 is rotatably connected to the mounting plate 10, so that it is driven to abut against the shift fork 23 through the flameout switch 31 to shut down the injection pump 60. When the diesel engine is in operation, the operator drives the transmission component 33 by toggling (closing) the flameout switch 31. The transmission component 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 delivery of the diesel engine, and stopping the operation of the diesel engine. During this process, the transmission component 33 will twist the reset component 32 when it moves; after the diesel engine stops operating, the flameout switch 31 is released, and the reset component 32 in the twisted state has elastic force, which will drive the flameout switch 31 to rotate to drive the transmission component 33, so that the flameout switch 31 is automatically reset to the on state, which 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 31 in the normally open state, so that the engine can be quickly restarted in an emergency, thereby meeting the needs of an efficient working environment.

[0046] Specifically, Figure 1-3As shown, in the embodiment of the present invention, 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 fuel 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 the fuel injection pump 60 is turned off and the fuel supply is stopped, thereby ensuring that the engine returns to the idle state or stops completely.

[0047] Based on the above scheme, if Figure 1-3 As shown, in the embodiment of the present invention, 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 distance 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, and 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 Figure 4-6 As shown, an embodiment of the present invention 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 fuel 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 fuel 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 along 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 solutions of the present invention rather than as a barrier. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A linkage throttle mechanism, characterized in that: include: A mounting plate (10) is arranged on the engine; The control mechanism (20) comprises a handle (21) rotatably mounted on the mounting plate (10), a fork shaft (22) transmission-connected to the handle (21), and a fork (23) fixedly mounted 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 via the handle (21) so as to adjust the fuel supply of the fuel injection pump (60).

2. A linkage throttle mechanism according to claim 1, characterized in that: A fixing rod (24) is rotatably arranged on the mounting plate (10); one end of the fixing rod (24) passes through the mounting plate (10) to be connected to the handle (21), and the other end is connected to a rotating 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); the speed regulating arm (26) and the rotating arm (25) are connected via a tension spring (27).

3. A linkage throttle mechanism according to claim 2, characterized in that: A torsion spring (28) is provided between the mounting plate (10) and the rotating arm (25), and the torsion spring (28) is sleeved on the outer surface of the fixing rod (24).

4. A linkage throttle mechanism according to claim 2, characterized in that: The handle (21) is provided with an arc-shaped groove (211), and the mounting plate (10) is provided with a stud (11), and the stud (11) is slidably connected in the arc-shaped groove (211).

5. A linkage throttle mechanism according to claim 2, characterized in that: Two limiting bolts (29) are arranged on the mounting plate (10), and the two limiting bolts (29) are respectively located on two sides of the handle (21).

6. A linkage throttle mechanism according to claim 1, characterized in that: The invention also comprises a flameout mechanism (30), the flameout mechanism (30) comprising a flameout switch (31), a reset component (32) and a transmission component (33), one end of the flameout switch (31) passes through the mounting plate (10) and is rotatably connected thereto, the reset component (32) is sleeved on the flameout switch (31), and two ends of the reset component (32) are respectively connected to 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 to the mounting plate (10) so as to be driven by the flameout switch (31) to abut against the shift fork (23) so as to shut down the fuel injection pump (60).

7. A linkage throttle mechanism according to claim 6, characterized in that: The reset component (32) comprises a reset spring, the reset spring is sleeved on the flameout switch (31), and two ends of the reset spring are respectively in contact with the mounting plate (10) and the transmission component (33); the transmission component (33) comprises a support arm, the support arm is mounted on the flameout switch (31) and is located outside the reset spring so as to be driven by the flameout switch (31) to contact the shift fork (23) so as to shut down the fuel injection pump (60).

8. The linkage throttle mechanism according to claim 1, characterized in that: 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).

9. 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 8 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).

10. An engine according to claim 9, 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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