Speed changing and gear shifting emergency stop structure of mini-tiller

Abstract

The utility model provides a speed changing and gear shifting emergency stop structure of a mini-tiller, which comprises a gear shifting control mechanism, an engine belt pulley arranged on an output shaft of an engine and an output belt pulley arranged on a power input shaft of a farm tool, and the engine belt pulley is provided with a first belt groove and a second belt groove. The output belt pulley comprises a first output belt pulley and a second output belt pulley which are fixedly connected or integrally arranged, the gear shifting control mechanism comprises a gear shifting control device, a first tensioning device and a second tensioning device, and an emergency stop device is arranged on the gear shifting control mechanism; the utility model discloses a speed-changing gear-shifting scram structure of a mini-tiller, which is used for speed-changing gear-shifting scram of the mini-tiller, is provided with a scram device, not only realizes high-speed and low-speed driving switching through a simple structure, but also can instantly realize top-speed shutdown, stop driving output and avoid loss in case of emergency. The emergency stop device instantly cuts off power transmission, and the out-of-control risk is avoided.

Description

Technical Field

[0001] This utility model relates to the field of micro agricultural machinery transmission devices, specifically to a speed shifting and emergency stop structure for a micro tiller. Background Technology

[0002] The transmission system is a core component of mini tillers used in agricultural operations. It primarily transmits engine power to rotary tillers and other implements, enabling soil cutting, turning, and breaking up, as well as crop cultivation. Depending on the design and application requirements, mini tillers utilize various transmission systems. Belt or chain gearboxes are among the most common. Mini tillers typically use air-cooled gasoline or water-cooled diesel engines as their power source. Power is transmitted via belt or chain to the gearbox, and then through the gearbox to the rotary tillers and other implements. This transmission method is simple in structure and economical, but its versatility is limited, making it suitable for areas with limited economic resources and simpler applications. Gearboxes are enclosed transmission devices, offering advantages such as high reliability, high transmission efficiency, and stable operation. However, current gearboxes have limited gear ratios, making them unsuitable for the wide range of applications. Different implements require different operating speeds, and the gearbox, being a single unit tightly integrated with the generator, is difficult to disassemble and cannot adjust its output speed according to the implement's operating requirements.

[0003] Moreover, although the gearbox has a clutch to control whether power transmission is enabled or disabled, it cannot instantly cut off power transmission in an emergency, making it difficult to avoid risks in time.

[0004] In summary, selecting the transmission ratio based on specific operational needs and environmental conditions to achieve optimal working results and economic benefits for different agricultural implements, while also being able to instantly cut off power transmission to avoid the risk of loss of control, is a technical problem that the industry currently needs to solve. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the above-mentioned traditional technologies and provide a micro-tiller's gear shifting emergency stop structure that can flexibly select the transmission ratio according to specific operational needs and environmental conditions to match different agricultural implements to achieve the best working effect and economic benefits, and can instantly cut off power transmission to avoid the risk of loss of control.

[0006] The objective of this utility model is achieved through the following technical measures:

[0007] A gear shifting and emergency stop structure for a micro-tiller includes a gear shifting control mechanism, an engine pulley mounted on the engine output shaft, and an output pulley mounted on the implement power input shaft. The engine pulley has a first belt groove and a second belt groove. The output pulley includes a first output pulley and a second output pulley that are fixedly connected or integrally formed. The diameter of the first output pulley is smaller than the diameter of the second output pulley. The first output pulley has a first output groove, and the second output pulley has a second output groove. The first belt groove on the engine pulley and the first output groove on the first output pulley are connected by a first transmission belt, and the second belt groove on the engine pulley and the second output groove on the second output pulley are connected by a second transmission belt.

[0008] The shift control mechanism includes a shift control device, a first tensioning device, and a second tensioning device. The first tensioning device contacts the first transmission belt and tensions or relaxes it. The second tensioning device contacts the second transmission belt and tensions or relaxes it. The shift control device controls the tensioning or relaxation of the first and second tensioning devices. The shift control mechanism is equipped with an emergency stop device. When the emergency stop device is activated, it releases the first and second tensioning devices, causing them to be in a relaxed state.

[0009] The shift control device includes a shift fork cover, a shift lever, a shift fork, and a shift fork shaft. The shift fork includes a first shift fork and a second shift fork. The shift fork cover is provided with a shift fork grille, which includes a first shift fork gear position grille, a second shift fork gear position grille, and a horizontal grille. One end of the first shift fork gear position grille and the second shift fork gear position grille are connected through the horizontal grille. A shift fork lever passes through the shift fork grille. The middle parts of the first shift fork and the middle parts of the second shift fork are rotatably mounted on the shift fork shaft. One end of the first shift fork is connected to a first pull rope, and the other end of the first shift fork is provided with a first shift fork groove. One end of the second shift fork is connected to a second pull rope, and the other end of the second shift fork is provided with a second shift fork groove. One end of the shift lever is rotatably mounted on the shift fork shaft, and the other end of the shift lever is a shift fork handle extending out of the shift fork cover. The middle part of the shift lever can be inserted into the first shift fork groove or the second shift fork groove and drive the first pull rope or the second pull rope to tighten or loosen. When the shift lever moves the first or second shift fork to the far end of the first or second shift fork gear position grid away from the horizontal grille, it is in the tensioned position. At this time, the corresponding pull cord is tightened, and the corresponding tensioning device is also tightened, enabling power transmission. Conversely, when in the horizontal grille position, the pull cord is slack, the tensioning device is released, and power transmission terminates.

[0010] The first shift fork slot and the second shift fork slot are arranged opposite to each other.

[0011] A first curved arm is provided between the first shift fork and the first pull rope. The first curved arm is bent and one end is hinged to the lower part of the first shift fork. The other end of the first curved arm is connected to the first pull rope through a first return spring.

[0012] A second curved arm is provided between the second shift fork and the second pull rope. The second curved arm is bent, one end of the second curved arm is hinged to the lower part of the second shift fork, and the other end of the second curved arm is connected to the second pull rope through a second return spring.

[0013] The first tensioning device includes a first tensioning swing arm and a first tensioning wheel. One end of the first tensioning swing arm is provided with a first tensioning wheel shaft, and the other end of the first tensioning swing arm is provided with a first swing arm shaft hole. A first pull rope connector is provided in the middle of the first tensioning swing arm. The first tensioning wheel is fitted on the first tensioning wheel shaft. The first tensioning swing arm rotates through the first swing arm shaft hole to be mounted on the swing arm shaft. The first tensioning swing arm is connected to a first pull rope, a first return spring, and a first shift fork through the first pull rope connector. The first tensioning wheel is located on one side of the first belt.

[0014] The second tensioning device includes a second tensioning swing arm and a second tensioning wheel. One end of the second tensioning swing arm has a second tensioning wheel shaft, and the other end has a second swing arm shaft hole. A second pull rope connector is located in the middle of the second tensioning swing arm. The second tensioning wheel is fitted onto the second tensioning wheel shaft. The second tensioning swing arm rotates through the second swing arm shaft hole and is mounted on the swing arm shaft. The second tensioning swing arm is connected to a second pull rope, a second return spring, and a second shift fork via the second pull rope connector. The second tensioning wheel is located on one side of the second belt. The first tensioning wheel is located on one side of the first belt and can tighten or loosen the belt pressure after the first tensioning swing arm rotates. The second tensioning wheel is located on one side of the second belt and can tighten or loosen the belt pressure after the second tensioning swing arm rotates, thus achieving the transmission of different power.

[0015] When the first or second shift fork is in the tensioned position, the traction torque of the corresponding first or second pull rope is located at the upper part of the shift fork shaft axis. Taking the first shift fork as an example, when the shift lever moves the first shift fork to the tensioned position, the first crank arm located at the far end of the first shift fork rotates accordingly, and the far end rotates upwards, so that the point of application of the traction force of the first return spring and the first pull rope is located at the upper part of the shift fork shaft axis, between the shift fork shaft and the shift lever. Once the emergency stop device slightly pushes the first shift fork out of the tensioned position, its traction force causes the proximal end of the first shift fork to quickly spring back to the slack position, the tension wheel slackens, and the power transmission stops instantly.

[0016] When the shift lever actuates the first or second shift fork, the elastic force of the first and second return springs acts on the first or second pull rope. Therefore, the traction force of the first or second pull rope is relatively large and can be easily adjusted by the spring tension to tighten the tensioning pulley, allowing the belt to reliably transmit power. The traction torque of the first or second pull rope is located at the upper part of the shift fork shaft, placing this torque between the shift fork shaft and the shift lever. This ensures that the first or second shift fork is in a self-locking state when tensioned, preventing it from automatically springing back.

[0017] The emergency stop device includes a release lever, a release lever, a return spring, and a lever shaft. One end of the release lever is fitted with a lever shaft sleeve, which is slidably mounted on the lever shaft. The other end of the release lever is a lever handle. The release lever is installed in the middle of the release lever. The return spring is mounted on the lever shaft, with one end connected to the release lever or release lever and positioned away from the shift fork. When the release lever is pressed down, it pushes the upper part of the shift fork, causing it to return to its original position. Because the shift fork relies on the tension of the pull rope and the return spring, the release lever of the emergency stop device, upon touching the upper part of the shift fork, easily breaks the tension, changing the tension from a stable state to a state of pulling the shift fork back to its original position. Under the action of the tension, the fork quickly returns to its original position, releasing both the first and second tensioning devices, stopping power transmission, and achieving an emergency stop.

[0018] The fork cover has a lever groove on the side away from the fork grille, and the release lever is located in the lever groove after returning to its original position.

[0019] The engine pulley is provided with a first belt anti-disengagement bar on its outer periphery. The first belt anti-disengagement bar is located outside the first belt and the second belt and prevents the first belt and the second belt from disengaging from the first belt groove and the second belt groove of the engine pulley.

[0020] The output pulley is provided with a second belt anti-disengagement bar and a third belt anti-disengagement bar on its outer periphery. The second belt anti-disengagement bar is located outside the first output pulley and prevents the first belt from disengaging from the first output pulley groove of the first output pulley. The third belt anti-disengagement bar is located outside the second output pulley and prevents the second belt from disengaging from the second output pulley groove of the second output pulley.

[0021] Due to the adoption of the above technical solution, the advantages of this utility model compared with the prior art are:

[0022] This utility model discloses a gear shifting and emergency stop structure for a micro-tiller, used for high-low speed shifting on an A-type tiller. It features an emergency stop device, not only achieving high-low speed drive switching with a simple structure, but also instantly stopping the machine in emergency situations, ceasing drive output and preventing damage. The high-low speed drive switching relies on first and second output pulleys of different diameters, resulting in a simple and reliable structure. The diameter ratio of each output pulley can be selected according to specific operational needs and environmental conditions to achieve optimal working results and economic benefits for different agricultural implements. The emergency stop device utilizes the elasticity of a return spring to instantly cut off power transmission, avoiding the risk of loss of control and solving a pressing technical problem in the industry.

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0025] Figure 2 This is a schematic diagram of the main structure of this utility model.

[0026] Figure 3 yes Figure 2 A three-dimensional structural diagram of the gear shift control device.

[0027] Figure 4 yes Figure 2 A three-dimensional structural diagram of the emergency stop device.

[0028] Figure 5 yes Figure 2 A three-dimensional structural diagram of the first tensioning device.

[0029] Figure 6 yes Figure 2 A three-dimensional structural diagram of the second loading device.

[0030] In the diagram: 1. Shift control device; 11. Shift fork cover; 12. Shift fork grille; 121. First shift fork gear position grille; 122. Second shift fork gear position grille; 123. Horizontal grille; 13. Shift fork handle; 14. Shift lever; 15. Shift fork lever; 16. First shift fork; 161. First pull rope; 162. First crank arm; 163. First return spring; 164. First shift fork groove; 17. Second shift fork; 171. Second pull rope; 172. Second crank arm; 173. Second return spring; 174. Second shift fork groove; 18. Shift fork shaft; 2. First tensioning device; 21. First tensioning swing arm; 22. First tensioning wheel; 23. First tensioning wheel shaft; 24. First swing arm shaft hole; 25. First pull rope connection Components; 3. Second tensioning device; 31. Second tensioning swing arm; 32. Second tensioning wheel; 33. Second tensioning wheel shaft; 34. Second swing arm shaft hole; 35. Second pull rope connector; 4. Emergency stop device; 41. Release lever; 42. Release lever; 43. Return spring; 44. Lever shaft; 45. Lever bushing; 46. Lever handle; 5. Engine pulley; 51. First belt groove; 52. Second belt groove; 53. First belt anti-derailment bar; 54. First transmission belt; 6. Output pulley; 61. First output pulley; 62. Second output pulley; 63. First output pulley groove; 64. Second output pulley groove; 65. Second belt anti-derailment bar; 66. Third belt anti-derailment bar; 67. Second transmission belt. Detailed Implementation

[0031] Example: Figures 1 to 6 As shown, a gear shifting and emergency stop structure for a micro-tiller includes a gear shifting control mechanism, an engine pulley 5 mounted on the engine output shaft, and an output pulley 6 mounted on the implement power input shaft. The engine pulley 5 has a first belt groove 51 and a second belt groove 52. The output pulley 6 includes a first output pulley 61 and a second output pulley 62 that are fixedly connected or integrally formed. The diameter of the first output pulley 61 is smaller than the diameter of the second output pulley 62. The first output pulley 61 has a first output pulley groove 63, and the second output pulley 62 has a second output pulley groove 64. The first belt groove 51 on the engine pulley 5 and the first output pulley groove 63 on the first output pulley 61 are connected by a first transmission belt 54, and the second belt groove 52 on the engine pulley 5 and the second output pulley groove 64 on the second output pulley 62 are connected by a second transmission belt 67.

[0032] The shift control mechanism includes a shift control device 1, a first tensioning device 2, and a second tensioning device 3. The first tensioning device 2 contacts the first transmission belt 54 and tensions or relaxes it. The second tensioning device 3 contacts the second transmission belt 67 and tensions or relaxes it. The shift control device 1 controls the tensioning or relaxation of the first tensioning device 2 and the second tensioning device 3. An emergency stop device 4 is provided on the shift control mechanism. When the emergency stop device 4 is activated, it releases the first tensioning device 2 and the second tensioning device 3, so that both are in a relaxed state.

[0033] The shift control device 1 includes a shift fork cover 11, a shift lever 14, a shift fork, and a shift fork shaft 18. The shift fork includes a first shift fork 16 and a second shift fork 17. The shift fork cover 11 is provided with a shift fork grille 12. The shift fork grille 12 includes a first shift fork gear position grille 121, a second shift fork gear position grille 122, and a horizontal grille 123. One end of the first shift fork gear position grille 121 and the second shift fork gear position grille 122 is connected through the horizontal grille 123. The shift fork grille 12 is provided with a shift fork lever 15. The middle of the first shift fork 16 and the middle of the second shift fork 17 are rotatably mounted. On the shift fork shaft 18, one end of the first shift fork 16 is connected to a first pull rope 161, and the other end of the first shift fork 16 is provided with a first shift fork groove 164. One end of the second shift fork 17 is connected to a second pull rope 171, and the other end of the second shift fork 17 is provided with a second shift fork groove 174. One end of the shift lever 14 is rotatably mounted on the shift fork shaft 18, and the other end of the shift lever 14 is a shift fork handle 13 extending out of the shift fork cover 11. The middle part of the shift lever 14 can be inserted into the first shift fork groove 164 or the second shift fork groove 174 and drive the first pull rope 161 or the second pull rope 171 to tighten or loosen. When the shift lever 14 drives the first shift fork 16 or the second shift fork 17 to the far end of the first shift fork gear grid 121 or the second shift fork gear grid 122, away from the horizontal grid 123, it is in the tensioned position. At this time, the corresponding pull cord is tightened, and the corresponding tensioning device is also tightened, enabling power transmission. Conversely, when it is in the horizontal grid 123 position, the pull cord is slack, the tensioning device is released, and power transmission terminates.

[0034] The first shift fork groove 164 and the second shift fork groove 174 are arranged opposite to each other.

[0035] A first crank arm 162 is provided between the first shift fork 16 and the first pull rope 161. The first crank arm 162 is bent. One end of the first crank arm 162 is hinged to the lower part of the first shift fork 16, and the other end of the first crank arm 162 is connected to the first pull rope 161 through a first return spring 163.

[0036] A second crank arm 172 is provided between the second shift fork 17 and the second pull rope 171. The second crank arm 172 is bent. One end of the second crank arm 172 is hinged to the lower part of the second shift fork 17, and the other end of the second crank arm 172 is connected to the second pull rope 171 through the second return spring 173.

[0037] The first tensioning device 2 includes a first tensioning swing arm 21 and a first tensioning wheel 22. One end of the first tensioning swing arm 21 is provided with a first tensioning wheel shaft 23, and the other end of the first tensioning swing arm 21 is provided with a first swing arm shaft hole 24. A first pull rope connector 25 is provided in the middle of the first tensioning swing arm 21. The first tensioning wheel 22 is fitted on the first tensioning wheel shaft 23. The first tensioning swing arm 21 rotates through the first swing arm shaft hole 24 to be mounted on the swing arm shaft. The first tensioning swing arm 21 is connected to the first pull rope 161, the first return spring 163 and the first shift fork 16 through the first pull rope connector 25. The first tensioning wheel 22 is located on one side of the first transmission belt 54.

[0038] The second tensioning device 3 includes a second tensioning swing arm 31 and a second tensioning wheel 32. One end of the second tensioning swing arm 31 is provided with a second tensioning wheel shaft 33, and the other end is provided with a second swing arm shaft hole 34. A second pull rope connector 35 is provided in the middle of the second tensioning swing arm 31. The second tensioning wheel 32 is fitted onto the second tensioning wheel shaft 33. The second tensioning swing arm 31 rotates through the second swing arm shaft hole 34 and is mounted on the swing arm shaft. The second tensioning swing arm 31 is connected to a second pull rope 171, a second return spring 173, and a second shift fork 17 via the second pull rope connector 35. The second tensioning wheel 32 is located on one side of the second belt. The first tensioning wheel 22 is located on one side of the first transmission belt 54 and can tighten or loosen the belt pressure after the first tensioning swing arm 21 rotates. The second tensioning wheel 32 is located on one side of the second transmission belt 67 and can tighten or loosen the belt pressure after the second tensioning swing arm 31 rotates, thus realizing the transmission of different power.

[0039] When the first shift fork 16 or the second shift fork 17 is in the tensioned position, the traction torque of the corresponding first pull rope 161 or second pull rope 171 is located at the upper part of the axis of the shift fork shaft 18. Taking the first shift fork 16 as an example, when the shift lever 14 moves the first shift fork 16 to the tensioned position, the first crank arm 162 located at the far end of the first shift fork 16 rotates accordingly, and the far end rotates upward relative to the first return spring 163 and the first pull rope 161, so that the point of application of the traction force of the first return spring 163 and the first pull rope 161 is located at the upper part of the axis of the shift fork shaft 18, between the shift fork shaft 18 and the shift lever 14. Once the emergency stop device 4 slightly pushes the first shift fork 16 out of the tensioned position, its traction force causes the proximal end of the first shift fork 16 to quickly spring back to the slack position, the tension wheel slacks, and the power transmission stops instantly.

[0040] When the shift lever 14 actuates the first shift fork 16 or the second shift fork 17, the elastic force of the first return spring 163 and the second return spring 173 acts on the first pull rope 161 or the second pull rope 171. Therefore, the traction force of the first pull rope 161 or the second pull rope 171 is relatively large, and it can be easily adjusted by the tension of the springs to tighten the tensioning pulley, allowing the belt to reliably transmit power. The traction torque of the first pull rope 161 or the second pull rope 171 is located on the upper part of the shift fork shaft 18, so that the torque of this traction force is located between the shift fork shaft 18 and the shift lever 14. This allows the first shift fork 16 or the second shift fork 17 to be in a self-locking state when it is engaged and tensioned, preventing it from automatically springing back.

[0041] The emergency stop device 4 includes a release lever 41, a release lever 42, a return spring 43, and a lever shaft 44. One end of the release lever 42 is fitted with a lever sleeve 45, which is slidably fitted onto the lever shaft 44. The other end of the release lever 42 is a lever handle 46. The release lever 41 is installed in the middle of the release lever 42. The return spring 43 is fitted onto the lever shaft 44. One end of the return spring 43 is connected to the release lever 41 or the release lever 42 and is kept away from the shift fork. When the release lever 42 is pressed down, it drives the release lever 41 to push the upper part of the shift fork and reset it. Because the shift fork relies on the tension of the pull rope and the return spring, and the release lever 41 of the emergency stop device 4 touches the upper part of the shift fork, it can easily break the tension state, so that the tension changes from a stable state to a state of pulling the shift fork to return to its original position, and quickly returns to its original position under the action of the tension, so that both the first tensioning device 2 and the second tensioning device 3 are released, the power transmission stops, and the emergency stop is achieved.

[0042] The fork cover 11 is provided with a lever groove on the side away from the fork grille 12, and the release lever 42 is located in the lever groove after returning to its original position.

[0043] The engine pulley 5 is provided with a first belt anti-disengagement bar 53 on its outer periphery. The first belt anti-disengagement bar 53 is located outside the first belt and the second belt and prevents the first belt and the second belt from disengaging from the first belt groove 51 and the second belt groove 52 of the engine pulley 5.

[0044] The output pulley 6 is provided with a second belt anti-detachment bar 65 and a third belt anti-detachment bar 66 on its outer periphery. The second belt anti-detachment bar 65 is located outside the first output pulley 61 and prevents the first belt from detaching from the first output pulley groove 63 of the first output pulley 61. The third belt anti-detachment bar 66 is located outside the second output pulley 62 and prevents the second belt from detaching from the second output pulley groove 64 of the second output pulley 62.

Claims

1. A gear shifting and emergency stop structure for a micro-tiller, characterized in that: The device includes a shift control mechanism, an engine pulley (5) mounted on the engine output shaft, and an output pulley (6) mounted on the implement power input shaft. The engine pulley (5) has a first belt groove (51) and a second belt groove (52). The output pulley (6) includes a first output pulley (61) and a second output pulley (62) that are fixedly connected or integrally formed. The diameter of the first output pulley (61) is smaller than the diameter of the second output pulley (62). The first output pulley (61) has a first output wheel groove (63), and the second output pulley (62) has a second output wheel groove (64). The first belt groove (51) on the engine pulley (5) and the first output wheel groove (63) on the first output pulley (61) are connected by a first transmission belt (54). The second belt groove (52) on the engine pulley (5) and the second output wheel groove (64) on the second output pulley (62) are connected by a second transmission belt (67). The shift control mechanism includes a shift control device (1), a first tensioning device (2), and a second tensioning device (3). The first tensioning device (2) contacts the first transmission belt (54) and tensions or relaxes it. The second tensioning device (3) contacts the second transmission belt (67) and tensions or relaxes it. The shift control device (1) controls the tensioning or relaxation of the first tensioning device (2) and the second tensioning device (3). An emergency stop device (4) is provided on the shift control mechanism. When the emergency stop device (4) is activated, it releases the first tensioning device (2) and the second tensioning device (3) so that they are both in a relaxed state.

2. The gear shifting and emergency stop structure for a micro-tiller according to claim 1, characterized in that: The shift control device (1) includes a shift fork cover (11), a shift lever (14), a shift fork, and a shift fork shaft (18). The shift fork includes a first shift fork (16) and a second shift fork (17). The shift fork cover (11) is provided with a shift fork grille (12). The shift fork grille (12) includes a first shift fork gear position grille (121), a second shift fork gear position grille (122), and a horizontal grille (123). One end of the first shift fork gear position grille (121) and the second shift fork gear position grille (122) is connected through the horizontal grille (123). The shift fork grille (12) is provided with a shift fork lever (15). The middle of the first shift fork (16) and the middle of the second shift fork (17) are rotatably mounted. On the shift fork shaft (18), one end of the first shift fork (16) is connected to a first pull rope (161), and the other end of the first shift fork (16) is provided with a first shift fork groove (164). One end of the second shift fork (17) is connected to a second pull rope (171), and the other end of the second shift fork (17) is provided with a second shift fork groove (174). One end of the shift lever (14) is rotatably mounted on the shift fork shaft (18), and the other end of the shift lever (14) is a shift fork handle (13) extending out of the shift fork cover (11). The middle part of the shift lever (14) can be inserted into the first shift fork groove (164) or the second shift fork groove (174) and drive the first pull rope (161) or the second pull rope (171) to tighten or loosen.

3. The gear shifting and emergency stop structure for a micro-tiller according to claim 2, characterized in that: The first shift fork groove (164) is arranged opposite to the second shift fork groove (174).

4. The gear shifting and emergency stop structure for a micro-tiller according to claim 2, characterized in that: A first crank arm (162) is provided between the first shift fork (16) and the first pull rope (161). The first crank arm (162) is bent. One end of the first crank arm (162) is hinged to the lower part of the first shift fork (16), and the other end of the first crank arm (162) is connected to the first pull rope (161) through a first return spring (163). A second crank arm (172) is provided between the second shift fork (17) and the second pull rope (171). The second crank arm (172) is bent. One end of the second crank arm (172) is hinged to the lower part of the second shift fork (17), and the other end of the second crank arm (172) is connected to the second pull rope (171) through the second return spring (173).

5. The gear shifting and emergency stop structure for a micro-tiller according to claim 2, characterized in that: The first tensioning device (2) includes a first tensioning swing arm (21) and a first tensioning wheel (22). One end of the first tensioning swing arm (21) is provided with a first tensioning wheel shaft (23), and the other end of the first tensioning swing arm (21) is provided with a first swing arm shaft hole (24). The middle part of the first tensioning swing arm (21) is provided with a first pull rope connector (25). The first tensioning wheel (22) is fitted on the first tensioning wheel shaft (23). The first tensioning swing arm (21) rotates through the first swing arm shaft hole (24) to be installed on the swing arm shaft. The first tensioning swing arm (21) is connected to the first pull rope (161), the first return spring (163) and the first shift fork (16) through the first pull rope connector (25). The first tensioning wheel (22) is located on one side of the first belt. The second tensioning device (3) includes a second tensioning swing arm (31) and a second tensioning wheel (32). One end of the second tensioning swing arm (31) is provided with a second tensioning wheel shaft (33), and the other end of the second tensioning swing arm (31) is provided with a second swing arm shaft hole (34). A second pull rope connector (35) is provided in the middle of the second tensioning swing arm (31). The second tensioning wheel (32) is fitted on the second tensioning wheel shaft (33). The second tensioning swing arm (31) rotates through the second swing arm shaft hole (34) to be installed on the swing arm shaft. The second tensioning swing arm (31) is connected to the second pull rope (171), the second return spring (173), and the second shift fork (17) through the second pull rope connector (35). The second tensioning wheel (32) is located on one side of the second belt.

6. The gear shifting and emergency stop structure for a micro-tiller according to claim 5, characterized in that: When the first shift fork (16) or the second shift fork (17) is in the tensioned position, the traction torque of the corresponding first pull rope (161) or second pull rope (171) is located at the upper part of the axis of the shift fork shaft (18). Taking the first shift fork (16) as an example, when the shift lever (14) moves the first shift fork (16) to the tensioned position, the first crank arm (162) located at the far end of the first shift fork (16) rotates accordingly, and the far end rotates upward relative to the other end, so that the point of force of the first return spring (163) and the first pull rope (161) is located at the upper part of the axis of the shift fork shaft (18), between the shift fork shaft (18) and the shift lever (14). Once the emergency stop device (4) slightly pushes the first shift fork (16) out of the tensioned position, its traction force causes the proximal end of the first shift fork (16) to quickly spring back to the slack position, the tension wheel slacks, and the power transmission stops instantly.

7. The gear shifting and emergency stop structure for a micro-tiller according to claim 2, characterized in that: The emergency stop device (4) includes a release lever (41), a release lever (42), a return spring (43), and a lever shaft (44). One end of the release lever (42) is fitted with a lever sleeve (45), which is slidably fitted onto the lever shaft (44). The other end of the release lever (42) is a lever handle (46). The release lever (41) is installed in the middle of the release lever (42). The return spring (43) is fitted onto the lever shaft (44). One end of the return spring (43) is connected to the release lever (41) or the release lever (42) and is kept away from the shift fork lever (15). When the release lever (42) is pressed down, it drives the release lever (41) to push the upper part of the shift fork and reset it.

8. The gear shifting and emergency stop structure for a micro-tiller according to claim 7, characterized in that: The fork cover (11) has a lever groove on the side away from the fork grille (12), and the release lever (42) is located in the lever groove after returning to its original position.

9. A gear shifting and emergency stop structure for a micro-tiller according to any one of claims 1 to 8, characterized in that: The engine pulley (5) is provided with a first belt anti-disengagement bar (53) on its outer periphery. The first belt anti-disengagement bar (53) is located on the outside of the first belt and the second belt, and prevents the first belt and the second belt from disengaging from the first belt groove (51) and the second belt groove (52) of the engine pulley (5).

10. A gear shifting and emergency stop structure for a micro-tiller according to any one of claims 1 to 8, characterized in that: The output pulley (6) is provided with a second belt anti-disengagement bar (65) and a third belt anti-disengagement bar (66) on its outer periphery. The second belt anti-disengagement bar (65) is located outside the first output pulley (61) and prevents the first belt from disengaging from the first output pulley groove (63) of the first output pulley (61). The third belt anti-disengagement bar (66) is located outside the second output pulley (62) and prevents the second belt from disengaging from the second output pulley groove (64) of the second output pulley (62).

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