Speed change device for agricultural machine and agricultural machine

Abstract

The speed change device comprises a power input shaft and two output half shafts, the power input shaft is respectively connected with the output half shafts through two transmission lines, two electromagnetic clutches are installed on the transmission line of each output half shaft, and the two electromagnetic clutches are connected with the power input shaft. A driving part of each electromagnetic clutch is fixedly connected with a driving part gear meshed with the preceding stage gear, a driven part of each electromagnetic clutch and a clutch shaft of the electromagnetic clutch synchronously act, and each clutch shaft is statically connected with an output gear; by controlling the on-off state of each electromagnetic clutch, the four output gears alternately output torque to the rear-stage gear to drive the output half shaft. The agricultural machine can be flexibly and reliably controlled, the transmission energy efficiency is high, and remote control or unmanned operation is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery technology, and in particular to a speed change device for agricultural machinery. Background Technology

[0002] In the process of agricultural modernization, with the rapid development of large-scale agricultural operations and precision agriculture technology, agricultural machinery operation mode is facing the dual challenges of continuously rising labor costs and ever-increasing requirements for operational precision. This has led to the transformation of agricultural machinery from traditional manual operation to a less-manned or unmanned operation mode. As the core component of agricultural machinery, the remote control or unmanned operation capability of agricultural machinery using transmission devices has become an inevitable development trend. Traditional agricultural machinery transmission devices mainly include mechanical gearboxes, hydraulic automatic gearboxes, and electric drive gearboxes. These three types of gearboxes face the following challenges in adapting to remote control and unmanned operation: 1. While mechanical gearboxes are simple and reliable in structure, their reliance on manual shifting results in slow response and low control precision. 2. Although hydraulic automatic gearboxes achieve a certain degree of automation, their control systems are complex, requiring components such as hydraulic pumps, control valve groups, and actuator motors. Energy undergoes two conversions: mechanical energy to hydraulic energy and back to mechanical energy, resulting in low transmission efficiency. Hydraulic components require high precision machining, leading to high manufacturing costs and difficult maintenance. 3. While electric drive gearboxes offer flexible control, they face two key constraints in practical applications: firstly, in terms of power supply, to meet the power demands of field operations, large-capacity onboard batteries or generators are required, increasing both the overall machine weight and manufacturing costs; secondly, regarding continuous operation capability, current battery technology limits the continuous operation capability of electric motor drive systems during high-intensity continuous operation. Utility Model Content

[0003] The purpose of this invention is to provide a speed change device that enables precise motion control, efficient power transmission, and facilitates remote or unmanned operation of agricultural machinery.

[0004] To solve the above problems, the technical solution adopted by this utility model is as follows: This transmission device for agricultural machinery includes a power input shaft and two output half-shafts. The power input shaft is connected to the corresponding output half-shafts through different transmission routes. Two electromagnetic clutches are installed on the transmission routes of each output half-shaft. The driving part of each electromagnetic clutch is fastened to a driving gear that meshes with the front gear. The driven part of the electromagnetic clutch moves synchronously with the clutch shaft of the electromagnetic clutch. Each clutch shaft is statically connected to an output gear. By controlling the on / off state of each electromagnetic clutch, the four output gears alternately output torque to the rear gear, and the rear gear drives the corresponding output half-shaft.

[0005] In the above-mentioned technical solution for the transmission device of agricultural machinery, a more specific technical solution may be: the two ends of each of the clutch shafts are supported by the partition plate in the machine box and the gearbox housing respectively through bearings.

[0006] In some possible implementations, a gear shifting tooth is mounted on the power input shaft, which slides axially to select and engage multiple gear teeth on the gear shaft. A transition tooth is also mounted on the gear shaft. The gear teeth and the transition teeth are respectively connected to the corresponding drive gear. The number of teeth of the transition teeth is the same as that of the gear teeth that transmit power backward.

[0007] In some possible implementations, each of the output half-shafts is provided with a reversing transmission mechanism on its reversing transmission path to transmit power and cause the output half-shaft to rotate in the opposite direction.

[0008] In some possible implementations, the reversing transmission mechanism is any one of the following:

[0009] The driving gear of the electromagnetic clutch located at the front stage on each of the aforementioned transmission routes serves as the reversing transmission mechanism;

[0010] A reversing gear is added between the transition tooth or the gear tooth that transmits power backward and the driving gear on the same side. The reversing gear and the reversing shaft serve as the reversing transmission mechanism.

[0011] A multi-stage double gear is provided between the electromagnetic clutch and the output half-shaft on the same side. A reverse gear is added between the driving tooth of the first-stage double gear and the output gear. The reverse gear and the reverse shaft serve as the reverse transmission mechanism.

[0012] In some possible implementations, the transmission mechanism from the first-stage double gear to the corresponding output half-shaft is a shared portion of the forward and reverse transmission paths on the same side.

[0013] Another objective of this utility model is to provide an agricultural machine whose gearbox is any of the above-mentioned agricultural machinery transmission devices.

[0014] In the above-mentioned technical solution for agricultural machinery, a more specific technical solution could be: the output half-shaft is connected to the drive wheel via a coupling, and the drive wheel is connected via a chain or bevel gear transmission box.

[0015] In some possible implementations, the on / off state of the electromagnetic clutch is controlled by a control unit, the output of which is connected to the electromagnetic coil of the electromagnetic clutch, and the input of which is connected to the output of a receiver, which is connected to a remote control transmitter via a wireless signal. The control unit also includes an interlock circuit, the output of which is connected to the electromagnetic coil of the electromagnetic clutch on the same side.

[0016] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art:

[0017] 1. This utility model's agricultural machinery transmission device innovatively combines electromagnetic clutches and gear transmission, achieving precise motion control, efficient power transmission, and facilitating remote or unmanned operation of agricultural machinery. Each output half-shaft is equipped with two electromagnetic clutches, totaling four electromagnetic clutches to achieve independent control on both sides. This not only gives the agricultural machinery superior maneuverability with bidirectional 360-degree rotation in place but also maintains excellent stability and reliability in complex operating environments. By precisely controlling the on / off state of the electromagnetic clutches, the forward, reverse, or stop of each output half-shaft can be flexibly adjusted, achieving precise motion control for forward, backward, and steering movements, fully meeting the stringent requirements for motion precision in unmanned operations. Compared to traditional mechanical gearboxes, electromagnetic clutches are more convenient to control and suitable for electronic or remote control operation. Compared to hydraulic automatic gearboxes, they offer higher energy transmission efficiency, avoiding energy loss. Compared to electric drive gearboxes, their manufacturing and maintenance costs are significantly reduced.

[0018] 2. Each clutch shaft is supported at both ends by bearings from the partition plate in the chassis and the gearbox housing, ensuring that the two coaxial clutch shafts are independent and do not interfere with each other. This double support structure enables the clutch shaft to obtain a uniform force distribution, improves the rigidity of the shaft system, effectively suppresses vibration and sway during high-speed operation, and achieves a dual improvement in structural stability and transmission accuracy. It is particularly suitable for the stringent requirements of unmanned operation with frequent forward and reverse rotation.

[0019] 3. The gear mechanism design enables multi-gear switching to adapt to different operational needs; gear switching operation is simple, improving the applicability of agricultural machinery and user experience; the number of teeth of the transition teeth on the gear shaft and the gear teeth that transmit power backward is the same, so that the speed ratio of the transmission paths on the left and right sides is the same, ensuring that the speed of the left and right half shafts is consistent.

[0020] 4. The reverse transmission mechanism is combined with the forward transmission path. The switching between forward and reverse rotation can be achieved by controlling the alternating engagement of the electromagnetic clutches on the same side, which simplifies the operation process and improves the ease of use. It provides a variety of implementation schemes for the reverse transmission mechanism, which significantly improves the performance and application value of the gearbox transmission system. It can adapt to different mechanical structure requirements and application scenarios and meet the needs of agricultural machinery under different working conditions.

[0021] 5. The shared transmission mechanism simplifies the overall structure, reduces the number of parts required in the forward and reverse rotation paths, lowers the complexity of design and manufacturing, and saves space and manufacturing costs. In addition, the shared transmission mechanism also reduces energy loss in the power transmission process, improves transmission efficiency, and ensures more efficient power transmission in both forward and reverse rotation.

[0022] 6. Offers both chain and bevel gear drive options, allowing for adaptation to different working environments and needs.

[0023] 7. The installation of control unit, remote transmitter and receiver provides a reliable technical foundation for remote and unmanned operation of agricultural machinery, while significantly enhancing operational safety and reducing the risk of failure; the interlocking circuit design effectively avoids simultaneous engagement of electromagnetic clutches on the same side, preventing gear damage and further improving the reliability and service life of the system. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the speed change device.

[0025] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of this speed change device.

[0026] Figure 3 This is a schematic diagram of the structure of embodiment 3 of the speed change device.

[0027] Figure 4 This is a schematic diagram of the connection structure of the partition in the chassis.

[0028] Figure 5 yes Figure 4 Cross-sectional view along the AA direction.

[0029] Figure 6 This is a schematic diagram of the structure of Embodiment 1 of this agricultural machine.

[0030] Figure 7 This is a schematic diagram of the structure of Embodiment 2 of this agricultural machine.

[0031] Explanation of reference numerals: 1. First gear shift gear; 2. Second gear shift gear; 3. Third gear shift gear; 4. First gear gear; 5. Second gear gear; 6. Third gear gear; 7. Transition gear; 8. First driving gear; 9. Second driving gear; 10. First output gear; 11. Second output gear; 12. Left transition double driving gear; 13. Left transition double driven gear; 14. Left reduction double driving gear; 15. Left reduction double driven gear; 16. Left half-shaft gear; 17. Left half-shaft; 1 8. Left reduction shaft; 19. Transition shaft; 20. Second clutch shaft; 21. Second electromagnetic clutch; 21A. Second driving part; 21B. Second driven part; 22. First clutch shaft; 23. First electromagnetic clutch; 23A. First driving part; 23B. First driven part; 24. Gear shift shaft; 25. Power input shaft; 26. Gearbox housing; 27. Pulley; 28. Third driving part gear; 29. ​​Fourth driving part gear; 30. Third output gear; 31. Fourth output gear Gear; 32. Right transition double-link drive gear; 33. Right transition double-link driven gear; 34. Right reduction double-link drive gear; 35. Right reduction double-link driven gear; 36. Right half-shaft gear; 37. Right half-shaft; 38. Right reduction shaft; 39. Fourth clutch shaft; 40. Fourth electromagnetic clutch; 40A. Fourth drive unit; 40B. Fourth driven unit; 41. Third clutch shaft; 42. Third electromagnetic clutch; 42A. Third drive unit; 42B. Third driven unit; 43. Chassis partition; 44. Left reversing gear; 45. Right reversing gear; 46. Reversing shaft; 47. Frame; 48. Left front drive wheel; 49. Left rear drive wheel; 50. Sprocket; 51. Chain; 52. Coupling; 53. Gearbox; 54. Gearbox output pulley; 55. Power unit output pulley; 56. Power unit; 57. Right front drive wheel; 58. Right rear drive wheel; 59. Rear rotary tiller pulley; 60. Rear rotary tiller; 61. Rear rotary tiller blades; 62. Bevel gear transmission box; 63. Connecting shaft. Detailed Implementation

[0032] This utility model's transmission device features a simple structure and flexible operation, enabling precise switching between multiple operating modes via electromagnetic clutches, fully adapting to the power transmission and steering control needs of agricultural machinery under different working conditions. The transmission device mainly comprises a power input shaft and two output half-shafts, with the power input shaft connected to the two output half-shafts via two transmission routes. The agricultural machinery transmission device consists of a three-stage functional mechanism: the first stage is a shifting mechanism, i.e., a variable reduction ratio transmission stage; the second stage is a steering control mechanism, in which the left and right power transmission routes each branch into forward and reverse transmission lines; the third stage is an output mechanism, i.e., a fixed reduction ratio transmission stage. The steering control mechanism has four electromagnetic clutches, with two electromagnetic clutches installed on the transmission route of each output half-shaft. The driving part of each electromagnetic clutch is rigidly connected to a driving gear that meshes with the preceding gear, and the driving gear rotates concentrically around the clutch shaft via bearings, bushings, or direct sliding engagement; while the driven part of the electromagnetic clutch operates synchronously with the clutch shaft. Each clutch shaft is statically connected to an output gear, which meshes with the corresponding subsequent gear to ultimately drive the corresponding output half-shaft. By controlling the on / off state of the electromagnetic clutches on the transmission path of each output half-shaft, the four output gears can be independently controlled to start and stop. Each output gear controls two output half-shafts to independently achieve forward rotation, reverse rotation, or stop, ultimately controlling the entire machine to achieve various motion states.

[0033] It is worth mentioning that the housing of the transmission device for agricultural machinery can be designed as an integrated unit, combining the left and right transmission lines into one housing to simplify the structure and improve overall rigidity. A partition can also be installed in the middle of the steering control mechanism area within the housing, with clutch bearing mounting positions on the partition, allowing the four clutch shafts to rotate independently without interference. (See [reference]). Figure 1 , Figure 4 and Figure 5 The transmission device for agricultural machinery can also be configured with two separate housings for the two transmission routes, depending on actual needs, to facilitate maintenance and modular design.

[0034] A gear shifting tooth is installed on the power input shaft. This tooth slides axially to select and engage a single gear on the gear shaft, thus switching gears. A transition tooth is also installed on the gear shaft. Both the gear and transition teeth are connected to their respective drive gears to transmit power. The transition teeth have the same number of teeth as the gear teeth that transmit power backward, ensuring consistent transmission ratios.

[0035] The electromagnetic clutches described in the following embodiments are commercially available products. They are equipped with built-in bearings, and the electromagnet portion of the clutch is supported by the bearings on its own splined shaft or bushing, ensuring that the electromagnet portion, which is statically connected to the gearbox body, is motionally isolated from the rotating driven portion. The clutch shaft is a splined shaft with bearing positions at both ends, and the driving gear is supported by a bearing in the middle. When the driving and driven portions of the electromagnetic clutch are not energized, the driving gear rotates freely around the clutch shaft (without load). Only when the electromagnetic coil of the electromagnetic clutch is energized will the driving and driven portions engage, and the friction surfaces generate friction under the engagement pressure to transmit torque.

[0036] It is worth mentioning that each output half-shaft is equipped with a reverse transmission mechanism on its reverse transmission path to transmit power and make the output half-shaft rotate in the opposite direction. The forward and reverse transmission paths are separated by an odd number of gear transmission stages, ensuring that the forward and reverse rotation directions of the output half-shaft are opposite. The reversing transmission mechanism can be any of the following or other mechanisms with the same reversing principle: 1. The driving gear of the electromagnetic clutch located at the front stage on each transmission route serves as a reversing transmission mechanism, see Embodiment 1 of the transmission device for agricultural machinery, where the two driving gears on the same side mesh with each other; 2. A reversing gear is added between the transition gear or the gear tooth that transmits power backward on the same side and the driving gear. This reversing gear and reversing shaft serve as a reversing transmission mechanism, see Embodiment 2 of the transmission device for agricultural machinery. The two driving gears on the same side do not mesh with each other, and the added reversing gear meshes between the driving gear of the reversing route and the gear tooth or transition gear that transmits power backward, thus achieving a reversing effect; 3. A multi-stage double-tooth arrangement is provided between the electromagnetic clutch and the output half-shaft on the same side. The two driving gears on the same side do not mesh with each other, and a reversing gear is added between the driving tooth of the first-stage double-tooth arrangement and the output gear. This reversing gear and reversing shaft serve as a reversing transmission mechanism, see Embodiment 3 of the transmission device for agricultural machinery. The multi-stage double gear includes transition double gear and reduction double gear. The transition double gear meshes with the output gear and the reduction double gear respectively. The reduction double gear meshes with the half shaft gear, and the half shaft gear is statically connected to the output half shaft.

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0038] Example 1 of a transmission device for agricultural machinery

[0039] like Figure 1As shown, the two output half-shafts of the transmission device in this embodiment are the left half-shaft 17 and the right half-shaft 37, respectively. These two output half-shafts are connected to the power input shaft 25 through the transmission mechanism inside the gearbox to realize the distribution and transmission of power. The power input shaft 25 is installed inside the housing 26 of the transmission device. One end of the power input shaft 25 is connected to the gearbox input pulley 27 for receiving external power input. The shifting mechanism of the transmission device for agricultural machinery includes gear shifting teeth, a gear shaft, and gear teeth. The gear shifting teeth include a first gear shifting tooth 1, a second gear shifting tooth 2, and a third gear shifting tooth 3. The gear shaft 24 is equipped with a first gear tooth 4, a second gear tooth 5, a third gear tooth 6, and a transition tooth 7 for realizing multi-gear transmission of power. The second gear tooth 5 and the transition tooth 7 have the same number of teeth to ensure that the speeds of the left half-shaft 17 and the right half-shaft 37 are consistent. During operation, the shift fork is used to move the corresponding gear shift teeth on the power input shaft 25, so that they mesh with a gear shift tooth on the gear shaft 24, thereby achieving gear switching.

[0040] The steering control mechanism of the transmission device for agricultural machinery includes four electromagnetic clutches, four clutch shafts, four driving gears, four output gears, and a housing partition plate for mounting bearings. The electromagnet is statically connected to the housing 26 and is mounted on the splined bushing of the first driven part 23B of the first electromagnetic clutch 23 via bearings to ensure motion isolation between the stationary electromagnet and the rotating first driven part 23B. The splined bushing of the first driven part 23B is splinedly connected to the first clutch shaft 22 to achieve synchronous movement. The first driving gear 8 is fastened to the first driving part 23A of the first electromagnetic clutch 23 and is mounted on the first clutch shaft 22 via bearings to ensure that the first driving gear 8 can rotate concentrically with the first clutch shaft 22 while maintaining motion isolation. The first output gear 10 is statically connected to the first clutch shaft 22. The left end of the first clutch shaft 22 is mounted on the bearing position of the housing 26 via bearings, and the right end is mounted on the bearing position of the housing partition plate 43 via bearings. When the electromagnet is not energized, the first driving part 23A and the first driven part 23B are not engaged, the first driving part gear 8 rotates freely around the first clutch shaft 22, and the first clutch shaft 22 remains stationary. When the electromagnet is energized, the first driving part 23A and the first driven part 23B engage, the first driving part gear 8 transmits torque to the first output gear 10 via the first clutch shaft 22, and the first output gear 10 transmits torque to the left half-shaft 17 via the subsequent gear. The installation methods of the remaining second, third, and fourth electromagnetic clutches are the same as those of the first electromagnetic clutch 22.

[0041] In the steering mechanism, the first drive gear 8 and the third drive gear 28 mesh with the upper gear shift gear 5 and the transition gear 7, respectively. The second drive gear 9 meshes with the first drive gear 8, and the fourth drive gear 29 meshes with the third drive gear 28.

[0042] The output mechanism of the agricultural machinery transmission device in this embodiment mainly includes a transition shaft 19, a left reduction shaft 18, a right reduction shaft 38, a left half-shaft 17, and a right half-shaft 37, along with corresponding gears. The transition shaft 19 is equipped with a left transition double gear consisting of a left transition double driving gear 12 and a left transition double driven gear 13, and a right transition double gear consisting of a right transition double driving gear 32 and a right transition double driven gear 33. Each of the left and right transition double gears is mounted on the transition shaft via a support bearing, allowing independent rotation without interference. The left reduction shaft 18 is fixedly equipped with a left reduction double gear consisting of a left reduction double driving gear 14 and a left reduction double driven gear 15; the right reduction shaft 38 is fixedly equipped with a right reduction double gear consisting of a right reduction double driving gear 34 and a right reduction double driven gear 35. A left half-shaft gear 16 is statically connected to the left half-shaft 17, and a right half-shaft gear 36 is statically connected to the right half-shaft 37.

[0043] This embodiment, by precisely controlling the on / off state of four electromagnetic clutches (first electromagnetic clutch 23, second electromagnetic clutch 21, third electromagnetic clutch 42, and fourth electromagnetic clutch 40), can achieve multiple operating modes, including forward, reverse, turning, and 360-degree turning on the spot. The following is a combination of... Figure 1 The specific transmission routes and actions of each mode are explained in detail to better understand the flexibility and versatility of the transmission device in actual operation.

[0044] 1. Forward Mode: In forward mode, by shifting the gear shift teeth on the power input shaft 25, a specific gear on the gear shift shaft is selected for engagement, transmitting power to the gear shift shaft 24. Power then engages with the first driving gear 8 via the second gear 5, and with the transition gear 7 engaging with the third driving gear 28. The first electromagnetic clutch 23 and the third electromagnetic clutch 42 are engaged, while the second electromagnetic clutch 21 and the fourth electromagnetic clutch 40 are disengaged. Power is transmitted to the subsequent gear via the output gear, ultimately driving both the left half-shaft 17 and the right half-shaft 37 to rotate forward synchronously, thus achieving smooth forward movement of the entire machine. The following describes the specific transmission routes and actions of the left and right half-shafts in this embodiment.

[0045] (1) Transmission route and action of left half shaft 17 forward rotation:

[0046] Power is transmitted from the input pulley 27 of the gearbox to the power input shaft 25. Then, the gear is selected via the gear shift teeth, and power is transmitted to the gear shaft 24 via the corresponding shift teeth. Finally, the second gear 5 drives the first driving gear 8 to rotate. The first driving gear 8 is tightly connected to the first driving part 23A of the first electromagnetic clutch 23, so the first driving part 23A rotates synchronously with the first driving gear 8. When the first electromagnetic clutch 23 is energized and engaged, the first driving part 23A engages with the first driven part 23B, and power is transmitted to the first driven part 23B. The first driven part 23B rotates synchronously with the first clutch shaft 22. The first clutch shaft 22 drives the first output gear 10 to rotate. The first output gear 10 meshes with the left transition double driving gear 12, and power is sequentially transmitted to the left transition double driven gear 13, the left reduction double driving gear 14, and the left reduction double driven gear 15, ultimately driving the left half-shaft gear 16 to rotate, thereby causing the left half-shaft 17 to rotate forward.

[0047] (2) Transmission route and action of the right half-shaft 37 forward rotation:

[0048] Power is transmitted from the input pulley 27 of the gearbox to the power input shaft 25. The gear is then selected via the gear shift teeth, and power is transmitted to the gear shift shaft 24 via the corresponding shift teeth. From there, it drives the third drive gear 28 to rotate via the transition teeth 7. The third drive gear 28 is securely connected to the third drive part 42A of the third electromagnetic clutch 42, so the third drive part 42A rotates synchronously with the third drive gear 28. When the third electromagnetic clutch 42 is energized and engaged, the third drive part 42A engages with the third driven part 42B, and power is transmitted to the third driven part 42B. The third driven part 42B rotates synchronously with the third clutch shaft 41, which in turn drives the third output gear 30 to rotate. The third output gear 30 meshes with the right transition double drive gear 32, and power is sequentially transmitted to the right transition double driven gear 33, the right reduction double drive gear 34, and the right reduction double driven gear 35, ultimately driving the right half-shaft gear 36 to rotate, thereby causing the right half-shaft 37 to rotate forward.

[0049] 2. Reverse Mode: In this mode, the second electromagnetic clutch 21 and the fourth electromagnetic clutch 40 are engaged, while the first electromagnetic clutch 23 and the third electromagnetic clutch 42 are disengaged. The left half-shaft 17 and the right half-shaft 37 rotate backward synchronously, thereby realizing the reverse movement of the entire machine. The following is the specific transmission route and operation of the left and right half-shafts reversing in this embodiment.

[0050] (1) Reverse transmission route and operation of left half shaft 17:

[0051] Power is transmitted from the input pulley 27 of the gearbox to the power input shaft 25. Then, the gear is selected via the gear shift teeth, and power is transmitted to the gear shift shaft 24 via the corresponding shift teeth. The second gear 5 then drives the first drive gear 8 to rotate. The first drive gear 8 drives the second drive gear 9 to rotate. The second drive gear 9 is tightly connected to the second drive part 21A of the second electromagnetic clutch 21, so the second drive part 21A rotates synchronously with the second drive gear 9. When the second electromagnetic clutch 21 is energized and engaged, the second drive part 21A engages with the second driven part 21B, and power is transmitted to the second driven part 21B. The second driven part 21B rotates synchronously with the second clutch shaft 20, which drives the second output gear 11 to rotate. The second output gear 11 meshes with the left transition double drive gear 12, and power is sequentially transmitted to the left transition double driven gear 13, the left reduction double drive gear 14, and the left reduction double driven gear 15, ultimately driving the left half-shaft gear 16 to rotate, thereby causing the left half-shaft 17 to reverse.

[0052] (2) Reverse transmission route and operation of right half-shaft 37:

[0053] Power is transmitted from the input pulley 27 of the gearbox to the power input shaft 25. Then, the gear is selected via the gear shift teeth, and power is transmitted to the gear shift shaft 24 via the corresponding shift teeth. From there, the power drives the third drive gear 28 to rotate via the transition gear 7. The third drive gear 28 drives the fourth drive gear 29 to rotate. The fourth drive gear 29 is securely connected to the fourth drive part 40A of the fourth electromagnetic clutch 40, so the fourth drive part 40A rotates synchronously with the fourth drive gear 29. When the fourth electromagnetic clutch 40 is energized and engaged, the fourth drive part 40A engages with the fourth driven part 40B, and power is transmitted to the fourth driven part 40B. The fourth driven part 40B rotates synchronously with the fourth clutch shaft 39, which in turn drives the fourth output gear 31 to rotate. The fourth output gear 31 meshes with the right transition double drive gear 32, and the power is transmitted sequentially to the right transition double drive gear 33, the right reduction double drive gear 34 and the right reduction double drive gear 35, which ultimately drives the right half shaft gear 36 to rotate, thereby causing the right half shaft 37 to reverse.

[0054] 3. Left Turn Steering Mode: In this mode, the first electromagnetic clutch 23 and the second electromagnetic clutch 21 on the left side are not engaged, and the left half-shaft 17 is in a free state disconnected from the power source; the third electromagnetic clutch 42 is engaged, and the fourth electromagnetic clutch 40 is not engaged. Referring to the aforementioned "Right Half-shaft 37 Forward Rotation Transmission Route and Action," the right half-shaft 37 rotates forward. The entire machine uses the wheel on the left half-shaft 17 as a fulcrum to achieve left turn and movement. This left turn steering mode is suitable for scenarios requiring precise steering with small amplitude. However, because the wheel on the left half-shaft 17 is in a free state, in tracked or four-wheel drive mode, due to the large contact area between the track or wheel and the ground, the wheel on the left half-shaft 17 cannot provide driving force, resulting in a significant increase in steering resistance and making steering more difficult. Therefore, this mode is more suitable for use in low-resistance or soft ground conditions, especially in drive modes where both sides have a single wheel, allowing for flexible small-range steering.

[0055] 4. Right Turn and Movement Steering Mode: In this mode, the third electromagnetic clutch 42 and the fourth electromagnetic clutch 40 on the right side are not engaged, and the right half-shaft 37 is in a free state disconnected from the power source; the first electromagnetic clutch 23 on the left side is engaged, and the second electromagnetic clutch 21 is not engaged. Referring to the aforementioned "Left Half-shaft 17 Forward Rotation Transmission Route and Action," the left half-shaft 17 rotates forward. The entire machine uses the wheel on the right half-shaft 37 as a fulcrum to achieve right turn and movement. This right turn and movement steering mode is suitable for scenarios requiring precise steering with small amplitude. However, because the wheel mounted on the right half-shaft 37 is in a free state, in tracked or four-wheel drive modes, due to the large contact area between the track or wheel and the ground, the wheel on the right half-shaft 37 cannot provide driving force, resulting in a significant increase in steering resistance and making steering more difficult. Therefore, this mode is also more suitable for use in low-resistance or soft ground conditions, especially in drive modes where both sides have a single wheel, allowing for flexible small-range steering. The maneuvering mode is suitable for steering control of traditional two-wheel drive agricultural machinery, such as hand-held tractors, and can easily achieve turning on the spot using a single wheel as a fulcrum.

[0056] 5. Left-hand 360-degree stationary turning mode: In this mode, the second electromagnetic clutch 21 on the left and the third electromagnetic clutch 42 on the right engage. The left transmission route follows the previously described "reverse transmission route and action of left half-shaft 17," with left half-shaft 17 rotating in the opposite direction; the right transmission route follows the previously described "forward transmission route and action of right half-shaft 37," with right half-shaft 37 rotating forward. Because the left and right half-shafts rotate in opposite directions, the entire machine achieves a 360-degree left-hand rotation on the spot. This turning mode achieves a very small turning radius and low steering resistance, making it particularly suitable for tracked or four-wheel-drive agricultural machinery. In tracked drive mode, the opposing movements of the left and right tracks effectively disperse steering resistance, resulting in excellent steering performance. This mode is ideal for use in confined spaces or in work scenarios requiring high-precision steering. Due to the track or four-wheel support, the machine has good stability and is less prone to tipping over, making it suitable for upgrading agricultural machinery to remote-controlled or unmanned operation.

[0057] 6. Right-hand 360-degree on-the-spot turning mode: In this mode, the first electromagnetic clutch 23 on the left and the fourth electromagnetic clutch 40 on the right are engaged. The left transmission route follows the previously described "forward rotation transmission route and action of left half-shaft 17," with left half-shaft 17 rotating forward; the right transmission route follows the previously described "reverse rotation transmission route and action of right half-shaft 37," with right half-shaft 37 rotating in the opposite direction. Because the left and right half-shafts rotate in opposite directions, the entire machine achieves a 360-degree right-hand rotation on the spot. This steering method achieves a very small turning radius and low steering resistance, making it particularly suitable for tracked or four-wheel-drive agricultural machinery. In tracked drive mode, the opposing movements of the left and right tracks effectively disperse steering resistance, resulting in excellent steering performance. This mode is ideal for use in confined spaces or in work scenarios requiring high-precision steering. Due to the track or four-wheel support, the machine has good stability and is less prone to tipping over, making it suitable for upgrading agricultural machinery to remote-controlled or unmanned operation.

[0058] Example 2 of a transmission device for agricultural machinery

[0059] The agricultural machinery transmission device in this embodiment provides a reverse transmission structure different from that in Case 1. In this structure, the first driving gear 8 and the second driving gear 9 do not mesh, and the third driving gear 28 and the fourth driving gear 29 do not mesh, so that the four driving gears are subjected to force separately in both forward and reverse rotation, achieving balanced force distribution. Specifically, as shown... Figure 2As shown, a reversing shaft 46 is added inside the gearbox. A left reversing gear 44 and a right reversing gear 45 are mounted on this shaft 46. The left and right reversing gears 44 and 45 can rotate independently around the reversing shaft 46. They are supported by bearings, sliding sleeves, or directly sliding with the reversing shaft 46. The left reversing gear 44 simultaneously meshes with the second gear 5 and the second driving gear 9, while the right reversing gear 45 simultaneously meshes with the transition gear 7 and the fourth driving gear 29. Other structural features of this embodiment are the same as in Embodiment 1 of the transmission device for agricultural machinery.

[0060] The following is combined Figure 2 This embodiment details the specific transmission routes and actions for forward, reverse, turning, and 360-degree turning modes.

[0061] 1. Forward Mode: In forward mode, the first electromagnetic clutch 23 and the third electromagnetic clutch 42 are engaged, while the second electromagnetic clutch 21 and the fourth electromagnetic clutch 40 are not engaged. The left half-shaft 17 and the right half-shaft 37 both rotate in the forward direction, thereby enabling the entire machine to move forward. The transmission route in the forward mode of this embodiment is the same as that in Embodiment 1.

[0062] 2. Reverse Mode: In this mode, the second electromagnetic clutch 21 and the fourth electromagnetic clutch 40 are engaged, while the first electromagnetic clutch 23 and the third electromagnetic clutch 42 are not engaged. The left half-shaft 17 and the right half-shaft 37 rotate backward synchronously, thereby realizing the reverse movement of the entire machine. The following is the specific transmission route and operation of the left and right half-shafts reversing in this embodiment.

[0063] (1) Reverse transmission route and operation of left half shaft 17:

[0064] Power is transmitted from the input pulley 27 of the gearbox to the power input shaft 25. Then, by shifting the gear selector, power is transmitted to the gear selector shaft 24 via the corresponding gear selector teeth, and then drives the left reverse gear 44 to rotate via the second gear tooth 5. The left reverse gear 44 drives the second drive gear 9 to rotate. The second drive gear 9 is securely connected to the second drive part 21A of the second electromagnetic clutch 21, so the second drive part 21A rotates synchronously with the second drive gear 9. When the second electromagnetic clutch 21 is energized and engaged, the second drive part 21A engages with the second driven part 21B, and power is transmitted to the second driven part 21B. The second driven part 21B rotates synchronously with the second clutch shaft 20, and the second clutch shaft 20 drives the second output gear 11 to rotate. The second output gear 11 meshes with the left transition double drive gear 12, and the power is sequentially transmitted to the left driven gear 13, the left reduction double drive gear 14 and the left reduction double driven gear 15 of the left transition double drive gear, which ultimately drives the left half shaft gear 16 to rotate, thereby causing the left half shaft 17 to reverse.

[0065] (2) Reverse transmission route and operation of right half-shaft 37:

[0066] Power is transmitted from the input pulley 27 of the gearbox to the power input shaft 25. Then, by shifting the gear selector, power is transmitted to the gear selector shaft 24 via the corresponding gear selector teeth, and then drives the right reverse gear 45 to rotate via the transition gear 7. The right reverse gear 45 drives the fourth drive gear 29 to rotate. The fourth drive gear 29 is securely connected to the fourth drive part 40A of the fourth electromagnetic clutch 40, so the fourth drive part 40A rotates synchronously with the fourth drive gear 29. When the fourth electromagnetic clutch 40 is energized and engaged, the fourth drive part 40A engages with the fourth driven part 40B, and power is transmitted to the fourth driven part 40B. The fourth driven part 40B rotates synchronously with the fourth clutch shaft 39, and the fourth clutch shaft 39 drives the fourth output gear 31 to rotate. The fourth output gear 31 meshes with the right transition double drive gear 32, and the power is transmitted sequentially to the right transition double driven gear 33, the right reduction double drive gear 34 and the right reduction double driven gear 35, which ultimately drives the right half shaft gear 36 to rotate, thereby causing the right half shaft 37 to reverse.

[0067] 3. The left-turn traversing mode, right-turn traversing mode, left-to-right 360-degree stationary turning mode, and right-to-right 360-degree stationary turning mode are consistent with those in Example 1 of the agricultural machinery transmission device, and are achieved by controlling the four electromagnets to engage in a coordinated or independent manner. The specific transmission route can be referred to in Example 1 of the agricultural machinery transmission device.

[0068] Example 3 of a transmission device for agricultural machinery

[0069] The agricultural machinery transmission device of this embodiment provides a reverse transmission structure different from that of Embodiment 1. In this structure, the first driving gear 8 and the second driving gear 9 do not mesh, and the third driving gear 28 and the fourth driving gear 29 do not mesh, so that the four driving gears are subjected to force separately in forward and reverse rotation, achieving balanced force distribution. Figure 3 As shown, this embodiment also adds a reversing shaft 46, a left reversing gear 44, and a reversing gear 45 compared to embodiment 1 of the agricultural machinery transmission device. The reversing principle is similar to that of embodiment 2 of the agricultural machinery transmission device. The difference from embodiment 2 is that the added left reversing gear 44 is located between the output gear 10 of the left reversing transmission route and the left transition double drive gear 12, instead of being located between the second gear 5 and the second drive gear 9 as in embodiment 2. Similarly, the added right reversing gear 45 is also located between the output gear 30 of the right reversing transmission route and the right transition double drive gear 32, instead of being located between the transition gear 7 and the fourth drive gear 29 as in embodiment 2.

[0070] Specifically, in this embodiment, a reversing shaft 46 is also added inside the gearbox. A left reversing gear 44 and a right reversing gear 45 are installed on the reversing shaft 46. The left reversing gear 44 and the right reversing gear 45 rotate independently around the reversing shaft 46 and do not interfere with each other. They are supported by bearings or sliding sleeves or directly slide with the reversing shaft 46.

[0071] The following is combined Figure 3 This embodiment details the specific transmission routes and actions for forward, reverse, turning, and 360-degree turning modes.

[0072] 1. Forward Mode: In forward mode, the second electromagnetic clutch 21 and the fourth electromagnetic clutch 40 are engaged, while the first electromagnetic clutch 23 and the third electromagnetic clutch 42 are not engaged. Power is transmitted to the subsequent gear via the output gear, ultimately driving the left half-shaft 17 and the right half-shaft 37 to rotate forward synchronously, thus achieving smooth forward movement of the entire machine. The following is the specific transmission route and operation of the left and right half-shafts rotating forward in this embodiment.

[0073] (1) Transmission route and action of left half shaft 17 forward rotation:

[0074] Power is transmitted from the input pulley 27 of the gearbox to the power input shaft 25. Then, by shifting the gear selector, power is transmitted to the gear selector shaft 24 via the corresponding gear selector teeth, and then to the second drive gear 9 via the second gear tooth 5. The second drive gear 9 is tightly connected to the second drive part 21A of the second electromagnetic clutch 21, so the second drive part 21A rotates synchronously with the second drive gear 9. When the second electromagnetic clutch 21 is energized and engaged, the second drive part 21A engages with the second driven part 21B, and power is transmitted to the second driven part 21B. The second driven part 21B rotates synchronously with the second clutch shaft 20, which drives the second output gear 11 to rotate. The second output gear 11 meshes with the left transition double drive tooth 12, and power is sequentially transmitted to the left transition double driven tooth 13, the left reduction double drive tooth 14, and the left reduction double driven tooth 15, ultimately driving the left half-shaft tooth 16 to rotate, thereby causing the left half-shaft 17 to rotate forward.

[0075] (2) Transmission route and action of the right half-shaft 37 forward rotation:

[0076] Power is transmitted from the input pulley 27 of the gearbox to the power input shaft 25. Then, by shifting the gear selector, power is transmitted to the gear selector shaft 24 via the corresponding gear selector, and then drives the fourth drive gear 29 to rotate via the transition gear 7. The fourth drive gear 29 is tightly connected to the fourth drive part 40A of the fourth electromagnetic clutch 40, so the fourth drive part 40A rotates synchronously with the fourth drive gear 29. When the fourth electromagnetic clutch 40 is energized and engaged, the fourth drive part 40A engages with the fourth driven part 40B, and power is transmitted to the fourth driven part 40B. The fourth driven part 40B rotates synchronously with the fourth clutch shaft 39, which drives the fourth output gear 31 to rotate. The fourth output gear 31 meshes with the right transition double drive gear 32, and power is sequentially transmitted to the right transition double driven gear 33, the right reduction double drive gear 34, and the right reduction double driven gear 35, ultimately driving the right half-shaft gear 36 to rotate, thereby driving the right half-shaft 37 to rotate forward.

[0077] 2. Reverse Mode: In this mode, the first electromagnetic clutch 23 and the third electromagnetic clutch 42 are engaged, while the second electromagnetic clutch 21 and the fourth electromagnetic clutch 40 are disengaged. The left half-shaft 17 and the right half-shaft 37 rotate synchronously backward, thus achieving the reverse movement of the entire machine. The following is the specific transmission route and operation for the left and right half-shafts to reverse in this embodiment.

[0078] (1) Reverse transmission route and operation of left half shaft 17:

[0079] Power is transmitted from the input pulley 27 of the gearbox to the power input shaft 25. Then, by shifting the gear selector, power is transmitted to the gear selector shaft 24 via the corresponding gear selector teeth, and then to the first drive gear 8 via the second gear 5. The first drive gear 8 is tightly connected to the first drive part 23A of the first electromagnetic clutch 23, so the first drive part 23A rotates synchronously with the first drive gear 8. When the first electromagnetic clutch 23 is energized and engaged, the first drive part 23A engages with the first driven part 23B, and power is transmitted to the first driven part 23B. The first driven part 23B rotates synchronously with the first clutch shaft 22, which drives the first output gear 10 to rotate. The first output gear 10 meshes with the left reverse gear 44, and power is sequentially transmitted to the left transition double drive gear 12, the left transition double driven gear 13, the left reduction double drive gear 14, and the left reduction double driven gear 15, ultimately driving the left half-shaft gear 16 to rotate, thereby causing the left half-shaft 17 to reverse.

[0080] (2) Reverse transmission route and operation of right half-shaft 37:

[0081] Power is transmitted from the input pulley 27 of the gearbox to the power input shaft 25. Then, by shifting the gear selector, power is transmitted to the gear selector shaft 24 via the corresponding gear selector teeth, and then drives the third drive gear 28 to rotate via the transition gear 7. The third drive gear 28 is tightly connected to the third drive part 42A of the third electromagnetic clutch 42, so the third drive part 42A rotates synchronously with the third drive gear 28. When the third electromagnetic clutch 42 is energized and engaged, the third drive part 42A engages with the third driven part 42B, and power is transmitted to the third driven part 42B. The third driven part 42B rotates synchronously with the third clutch shaft 41, which drives the third output gear 30 to rotate. The third output gear 30 meshes with the right reverse gear 45, and power is sequentially transmitted to the right transition double drive gear 32, the right transition double driven gear 33, the right-right reduction double drive gear 34, and the right reduction double driven gear 35, ultimately driving the right half-shaft gear 36 to rotate, thereby causing the right half-shaft 37 to reverse.

[0082] 3. Left Turn and Movement Steering Mode: In this mode, the first electromagnetic clutch 23 and the second electromagnetic clutch 21 on the left side are not engaged, and the left half-shaft 17 is in a free state with the meshing teeth not engaged; the third electromagnetic clutch 42 on the right side is not engaged, and the fourth electromagnetic clutch 40 is engaged. Referring to the "Right Half-Shaft 37 Forward Rotation Transmission Route and Action" described above in this embodiment, the right half-shaft 37 rotates in the forward direction. The entire machine uses the wheel on the left half-shaft 17 as a fulcrum to achieve left turn and movement.

[0083] 4. Right Turn Movement Mode: In this mode, the third electromagnetic clutch 42 and the fourth electromagnetic clutch 40 on the right side are not engaged, and the right half-shaft 37 is in a free state with the meshing teeth not engaged; the first electromagnetic clutch 23 on the left side is not engaged, and the second electromagnetic clutch 21 is engaged. Referring to the "forward rotation transmission route of the left half-shaft 17" described above in this embodiment, the left half-shaft 17 rotates in the forward direction. The entire machine uses the wheel on the right half-shaft 37 as a fulcrum to achieve right turn movement.

[0084] 5. Left-direction 360-degree rotation mode: In this mode, the first electromagnetic clutch 23 on the left and the fourth electromagnetic clutch 40 on the right are engaged. The left transmission route refers to the "reverse transmission route and action of the left half-shaft 17" described in this embodiment, and the left half-shaft 17 rotates backward; the right transmission route refers to the "forward transmission route and action of the right half-shaft 37" described in this embodiment, and the right half-shaft 37 rotates forward. Since the left and right half-shafts rotate in opposite directions, the entire machine achieves a 360-degree left-direction rotation on the spot.

[0085] 6. Right-hand 360-degree rotation mode: In this mode, the second electromagnetic clutch 21 on the left and the third electromagnetic clutch 42 on the right are engaged. The left transmission route refers to the "forward rotation transmission route and action of the left half-shaft 17" described above in this embodiment, with the left half-shaft 17 rotating forward; the right transmission route refers to the "reverse rotation transmission route and action of the right half-shaft 37" described above, with the right half-shaft 37 rotating backward. Since the left and right half-shafts rotate in opposite directions, the entire machine achieves a 360-degree right-hand rotation on the spot.

[0086] Agricultural machinery Example 1

[0087] Figure 6 The agricultural machine shown uses a gearbox 53 that employs any of the aforementioned agricultural machinery transmission devices, combined with a power transmission and control system, to achieve efficient power transmission and flexible operation control, meeting the diverse needs of modern agricultural machinery. The agricultural machine in this embodiment mainly includes a frame 47, a power unit 56, a gearbox 53, drive wheels, transmission components, a rear rotary tiller, and a control system. The power unit 56 transmits power to the gearbox 53 via a power unit output pulley 55, a V-belt, and a gearbox input pulley 30. The left and right half-shafts of the gearbox 53 output torque to the left front drive wheel 48 and the right front drive wheel 57 respectively via a coupling 52. To ensure the continuity and stability of power transmission, sprockets 50 and chains 51 are installed on the axles of the left front drive wheel 48 and the left rear drive wheel 49 for transmission. Similarly, the right front drive wheel 57 and the right rear drive wheel 58 are also driven via sprockets 50 and chains 51.

[0088] In addition, the agricultural machine is equipped with a rear rotary tiller to meet tillage needs. Based on the power transmission described above, the output pulley 54 of the gearbox 53 transmits power to the rear rotary tiller 60 via a V-belt and the rear rotary tiller pulley 59. The output shaft of the rear rotary tiller 60 is equipped with rear rotary tiller blades 61 or rotary wheels for high-speed rotation to loosen the soil. This not only improves tillage efficiency but also enhances the versatility of the entire machine.

[0089] To achieve flexible operation control, the left half-shaft 42 and right half-shaft 43 of the gearbox 53 are controlled by electromagnetic clutches, enabling combined or individual movements. By controlling the on / off state of the electromagnetic clutches, the machine can perform operations such as forward rotation, reverse rotation, left and right turning, stationary rotation, and rotation of the rear rotary tillage blades. The control of the electromagnetic clutches is achieved by a control unit. The output of the control unit is connected to the electromagnetic coil of the electromagnetic clutch, and the input is connected to the output of the receiver. The receiver communicates with the remote control transmitter via wireless signals, thereby achieving remote control of the entire machine. In addition, the control unit is equipped with an interlock circuit. Its input is connected to the signal processing module of the control unit, and its output is connected to the electromagnetic coil of the electromagnetic clutch on the same side, used to precisely control the on / off state of the electromagnetic clutch on the same side, ensuring operational stability and safety. The control unit can use PLC (Programmable Logic Controller) or microcontroller, etc., to meet the needs of different application scenarios.

[0090] Agricultural machinery Example 2

[0091] like Figure 7 As shown, in this embodiment, the front and rear drive wheels on the same side of the agricultural machine are driven by two bevel gear transmission boxes 62 and a connecting shaft 63, which prevents the chain from being corroded by mud and water. The remaining features are the same as those in agricultural machine embodiment 1.

[0092] This invention employs multiple electromagnetic clutches in conjunction with a clutch shaft and gear transmission route, featuring flexible steering and precise motion control, making it particularly suitable for four-wheel drive agricultural machinery. In paddy field operations, this gearbox effectively prevents the machinery from getting stuck, requires a small turning radius, and can achieve 360-degree turning on the spot, significantly improving operational efficiency. For paddy fields in hilly areas of southern China, especially those with irregular plots or small areas, the advantages of this invention are particularly prominent. Its flexible control performance and adaptability can meet the operational needs of complex terrain, greatly improving the practicality and operational effectiveness of agricultural machinery.

Claims

1. A variable speed device for an agricultural machine comprising a power input shaft and two output half shafts, the power input shaft being in driving connection with the respective output half shafts through different transmission routes, characterised in that: Two electromagnetic clutches are installed on the transmission route of each output half shaft, the driving part of each electromagnetic clutch is fastened and connected with the driving part gear meshing with the front stage gear, the driven part of the electromagnetic clutch is synchronous with the clutch shaft of the electromagnetic clutch, and each clutch shaft is statically connected with an output gear.

2. The transmission for an agricultural machine of claim 1, wherein: The two ends of each clutch shaft are respectively supported by bearings from the partition plate in the machine box and the transmission box shell.

3. The transmission device for an agricultural machine according to claim 2, characterized by: Gear shifting teeth are installed on the power input shaft, the gear shifting teeth are selected to mesh with a plurality of gear teeth on the gear shaft in the axial direction, transition teeth are also installed on the gear shaft, the gear teeth and the transition teeth are respectively in transmission connection with the corresponding driving part gears, and the transition teeth have the same number of teeth as the gear teeth transmitting power backward.

4. The transmission device for an agricultural machine according to claim 3, characterized by: A reverse transmission mechanism transmitting power to make the output half shaft rotate reversely is arranged on the reverse transmission route of each output half shaft.

5. The transmission for an agricultural machine of claim 4, wherein: The reverse transmission mechanism is any of the following: The driving part gear of the electromagnetic clutch located in the front stage on each transmission route serves as the reverse transmission mechanism; A reverse gear is additionally arranged between the transition teeth or the gear teeth transmitting power backward and the driving part gear on the same side, and the reverse gear and reverse shaft serve as the reverse transmission mechanism; A plurality of double gears are arranged between the electromagnetic clutch and the output half shaft on the same side, a reverse gear is additionally arranged between the driving teeth of the first double gear and the output gear, and the reverse gear and reverse shaft serve as the reverse transmission mechanism.

6. The transmission for an agricultural machine of claim 5, wherein: The transmission mechanism from the first double gear to the corresponding output half shaft is a common part of the positive transmission route and the reverse transmission route on the same side.

7. An agricultural machine comprising a gearbox, characterised in that: The transmission box is the transmission device for agricultural machinery according to any one of claims 1 to 6.

8. The agricultural machine of claim 7, wherein: The output half shaft is connected with a driving wheel through a shaft coupling, and the driving wheel is connected through chain or bevel gear transmission box.

9. The agricultural machine of claim 8, wherein: The on-off electric state of the electromagnetic clutch is controlled by a control unit, the output end of the control unit is connected with the electromagnetic coil of the electromagnetic clutch, the input end of the control unit is connected with the output end of a receiver, the receiver is connected with a remote control transmitter through wireless signals, the control unit further includes an interlocking circuit, the input end of the interlocking circuit is connected with the signal processing module of the control unit, and the output end of the interlocking circuit is connected with the electromagnetic coil of the electromagnetic clutch on the same side.

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