Double clutch power shift transmission system structure of paddy field tractor

Abstract

The application relates to a paddy field tractor double-clutch power gear shifting transmission system structure, which comprises a main gear shifting input mechanism, a first output end of the main gear shifting input mechanism is transmissionally connected with an input end of a main gear shifting odd-numbered gear output mechanism or an input end of a main gear shifting even-numbered gear output mechanism through a synchronizer, a mechanical secondary gear shifting mechanism, an output shaft of the mechanical secondary gear shifting mechanism is transmissionally connected with a rear central mechanism, a PTO clutch, an input end of the PTO clutch is transmissionally connected with a second output end of the main gear shifting input mechanism, a three-speed PTO mechanism, an input end of the three-speed PTO mechanism is transmissionally connected with an output end of the PTO clutch, and an output end of the three-speed PTO mechanism is transmissionally connected with a PTO constant meshing mechanism. The double-clutch power gear shifting mechanism is used to meet the requirements of PTO forward and reverse rotation and various power output functions, realize odd-numbered gear and even-numbered gear switching, and solve the problem of a large turning radius of a tractor in a small land block.

Description

Technical Field

[0001] This invention relates to the field of agricultural machinery transmission technology, specifically to a dual-clutch power shift transmission system structure for paddy field tractors. Background Technology

[0002] With the development of tractor technology, power shift has become a key technology pursued by enterprises to improve their competitiveness. The core of power shift technology development is to achieve efficient transmission under the premise of uninterrupted power, meeting the needs of modern agriculture for efficiency, comfort, and intelligence. At the same time, it lays the foundation for the subsequent application of CVT and hybrid power technologies. Therefore, the application prospects of tractor power shift transmission systems have attracted much attention.

[0003] Compared to the plowing operation mode of traditional tractors, the PTO (Plate Towing) mode is a common operating condition for paddy field tractors, especially in paddy field environments. The rotary tillage operation of paddy field tractors requires multiple PTO speeds to match different agricultural implements, making them suitable for various operating modes. Traditional tractor PTOs are located at the rear end of the rear axle housing, and due to the axial space limitation of the main shaft, they can generally only be set to two speeds or forward and reverse output. However, with the increasing demand for forward and reverse PTOs and synchronous power output functions, the traditional tractor PTO output mode is gradually becoming unable to meet these diverse output function requirements.

[0004] In addition, during paddy field operations, due to the small size of the plots, the turning radius becomes an important indicator for evaluating the core competitiveness of tractors. Therefore, the speed-reversing function that can reduce the turning radius has become a direction for tractor companies to benchmark against international standards. Summary of the Invention

[0005] The technical problem to be solved by this invention is: how to improve the output speed variation capability of the PTO of a tractor, adapt to the needs of PTO forward and reverse rotation and multiple power output functions, and achieve this through a dual-clutch power shift mechanism. The oil circuit is controlled by an electronic control system, and the oil circuit simultaneously controls the AMT shift mechanism and the engagement and disengagement of the dual clutch, so as to realize the switching between odd and even gears and solve the problem of large turning radius of tractors in small plots.

[0006] The technical solution of the present invention to solve the above-mentioned technical problems is as follows:

[0007] A dual-clutch power shift transmission system structure for a paddy field tractor, comprising:

[0008] A main transmission input mechanism, wherein the main transmission input mechanism is provided with a first output terminal and a second output terminal;

[0009] The main transmission odd-speed output mechanism has an input end connected to the main transmission odd-speed output shaft via an odd-speed clutch.

[0010] The input end of the main transmission even-gear output mechanism is connected to the main transmission even-gear output shaft via an even-gear clutch;

[0011] The first output end of the main transmission input mechanism is connected to the input end of the main transmission odd-numbered gear output mechanism via a synchronizer, or is connected to the input end of the main transmission even-numbered gear output mechanism.

[0012] A mechanical auxiliary transmission mechanism, wherein the input end of the mechanical auxiliary transmission mechanism is drivenly connected to the output shaft of the even-numbered gear and the output shaft of the odd-numbered gear of the main transmission, and the output shaft of the mechanical auxiliary transmission mechanism is drivenly connected to a rear central mechanism.

[0013] The PTO clutch has its input end connected to the second output end of the main transmission input mechanism.

[0014] The three-speed PTO mechanism has its input end connected to the output end of the PTO clutch, and its output end is connected to a PTO constant engagement mechanism.

[0015] The beneficial effects of this invention are as follows: By using this invention, power is obtained from the second output end of the power shift mechanism via the PTO clutch, saving space along the length of the tractor and providing space for the PTO clutch and the three-speed PTO mechanism; the three-speed PTO mechanism increases the tractor's PTO output speed variation capability, making it suitable for various PTO operating modes; furthermore, by superimposing power reversal and gear shifting through the power shift mechanism and the mechanical pair transmission mechanism, multi-gear operation is achieved for both forward and reverse directions of the tractor, improving functionality. This is achieved by a dual-clutch power shift mechanism, using an electronic control system to control the hydraulic circuit, which simultaneously controls the AMT shift mechanism and the engagement and disengagement of the dual clutch, enabling switching between odd and even gears and solving the problem of large turning radii for tractors in small plots of land.

[0016] Based on the above technical solution, the present invention can be further improved as follows.

[0017] Furthermore, the main transmission input mechanism includes a power input shaft, on which a fourth-speed drive gear, a third-speed drive gear, a second-speed drive gear, a first-speed drive gear, and a PTO constant mesh drive gear are sequentially fixedly connected;

[0018] The fourth-speed drive gear or the second-speed drive gear is connected to the even-numbered output mechanism of the main transmission.

[0019] The third-speed drive gear or the first-speed drive gear is connected to the main transmission odd-speed output mechanism.

[0020] The PTO constant mesh drive gear is connected to the PTO clutch for transmission.

[0021] The beneficial effect of adopting the above-mentioned further solution is that different gears can be switched on the power input shaft through the even-numbered gear output mechanism and the odd-numbered gear output mechanism of the main transmission, thereby outputting different torques.

[0022] Furthermore, the main transmission odd-speed output mechanism includes a main transmission odd-speed input shaft and a main transmission odd-speed output shaft;

[0023] The main transmission odd-numbered gear input shaft is sequentially connected to a third-speed driven gear and a first-speed driven gear. The synchronizer on the main transmission odd-numbered gear input shaft enables the third-speed driven gear to mesh with the third-speed driving gear or the first-speed driven gear to mesh with the first-speed driving gear.

[0024] The output shaft of the odd-numbered gear of the main transmission and the input shaft of the odd-numbered gear of the main transmission are connected by an odd-numbered gear clutch.

[0025] The advantage of adopting the above-mentioned further solution is that it enables effective switching of odd gears through the synchronizer on the input shaft of the odd gear of the main transmission.

[0026] Furthermore, the main transmission even-gear output mechanism includes a main transmission even-gear input shaft and a main transmission even-gear output shaft;

[0027] The main transmission even-numbered gear input shaft is sequentially connected to a fourth-speed driven gear and a second-speed driven gear. The synchronizer on the main transmission even-numbered gear input shaft enables the fourth-speed driven gear to mesh with the fourth-speed driving gear or the second-speed driven gear to mesh with the second-speed driving gear.

[0028] The even-numbered gear output shaft of the main transmission and the even-numbered gear input shaft of the main transmission are connected by an even-numbered gear clutch.

[0029] The advantage of adopting the above-mentioned further solution is that it enables effective switching of even gears through the synchronizer on the even gear input shaft of the main transmission.

[0030] Furthermore, the mechanical auxiliary transmission mechanism includes a main transmission high and low gear driven gear shaft;

[0031] The high-speed driven gear and the low-speed driven gear are connected sequentially on the main transmission high-speed and low-speed driven gear shaft;

[0032] The odd-numbered gear output shaft of the main transmission is sequentially connected to an odd-numbered high-gear drive gear and an odd-numbered low-gear drive gear; the synchronizer on the even-numbered gear output shaft of the main transmission enables the odd-numbered high-gear drive gear to mesh with the high-gear driven gear or the odd-numbered low-gear drive gear to mesh with the low-gear driven gear.

[0033] The even-numbered gear output shaft of the main transmission is sequentially connected to an even-numbered high-gear drive gear and an even-numbered low-gear drive gear; the synchronizer on the even-numbered gear output shaft of the main transmission enables the even-numbered high-gear drive gear to mesh with the high-gear driven gear or the even-numbered low-gear drive gear to mesh with the low-gear driven gear.

[0034] The beneficial effect of adopting the above-mentioned further scheme is that the switching of different gears, combined with the high and low gear outputs on the odd-numbered gear output shaft and the even-numbered gear output shaft of the main transmission, enables the high and low gear driven gear shaft of the main transmission to achieve an eight-speed main transmission.

[0035] Furthermore, the mechanical auxiliary transmission mechanism also includes an auxiliary low-gear driven gear shaft; the main high-low gear driven gear shaft is also connected to an auxiliary low-gear driven gear, the auxiliary low-gear driven gear is driven and connected to the auxiliary low-gear driven gear shaft through a synchronizer, and the end of the main high-low gear driven gear shaft away from the power input shaft is connected to an auxiliary transmission output shaft, the auxiliary transmission output shaft is driven and connected to the rear central mechanism.

[0036] The advantage of adopting the above-mentioned further scheme is that, on the basis of realizing the switching between odd and even gears, a two-speed pair shift is performed through the mechanical pair shift mechanism.

[0037] Furthermore, it also includes a power reversing mechanism, which includes a reverse gear driven gear shaft and a power reversing clutch;

[0038] The secondary transmission output shaft is sequentially connected to a reverse gear drive gear and a reverse gear driven gear. The reverse gear drive gear is connected to the reverse gear driven gear shaft via a power reversing clutch. The reverse gear driven gear is connected to the reversing idler gear on the reverse gear driven gear shaft via a power reversing clutch.

[0039] The advantage of adopting the above-mentioned further solution is that it enables switching between forward and reverse directions through a power reversing clutch.

[0040] Furthermore, one end of the PTO clutch is connected to a PTO input shaft, and a PTO constant mesh driven gear is connected to the PTO input shaft. The PTO constant mesh driven gear is connected to the PTO constant mesh driving gear in a transmission connection.

[0041] The other end of the PTO clutch is connected to a PTO drive gear shaft, which is equipped with multiple gears with different numbers of teeth.

[0042] The three-speed PTO mechanism includes a PTO gearbox shaft, on which a PTO low-gear driven gear, a PTO medium-gear driven gear, and a PTO high-gear driven gear are sequentially connected via a synchronizer. The PTO low-gear driven gear, PTO medium-gear driven gear, and PTO high-gear driven gear mesh with gears of different numbers of teeth for transmission.

[0043] The beneficial effects of adopting the above-mentioned further scheme are achieved by the PTO unit and the PTO constant meshing unit, with a total of three-speed PTO and multiple PTO speeds to match different agricultural implements.

[0044] Furthermore, the PTO input shaft is also equipped with a PTO input drive gear, which is connected to a hydraulic power take-off mechanism.

[0045] The beneficial effects of adopting the above-mentioned further solution are that it drives the gear pump to provide power to the power shift control valve and the steering lifting system. The gears in this unit use helical gear transmission, which is more efficient and runs more smoothly than the traditional spur gear transmission, reducing the risk of abnormal noise. The hydraulic power take-off housing is integrated into the rear axle housing, making installation more convenient. At the same time, this unit has forced lubrication, which reduces the risk of failure of bearings and gears at high speeds.

[0046] Furthermore, a small bevel gear shaft is connected between the mechanical pair transmission mechanism and the rear central mechanism, and a double-speed four-wheel drive mechanism is driven on the small bevel gear shaft.

[0047] The beneficial effect of adopting the above-mentioned further solution is to provide power to the front drive axle and realize two-wheel drive, four-wheel drive and double speed modes through a wet clutch. This unit adopts an electronic control system with three-way oil circuit control, which is more convenient to operate compared with the traditional mechanical transfer case. Attached Figure Description

[0048] Figure 1 This is a transmission diagram of the dual-clutch power shift transmission system structure for paddy field tractors provided by the present invention.

[0049] The attached diagram lists the components represented by each number as follows:

[0050] 1. Main transmission input mechanism; 2. Main transmission odd-speed output mechanism; 3. Main transmission even-speed output mechanism; 4. Mechanical auxiliary transmission mechanism; 5. Power reversing mechanism; 6. Hydraulic power take-off mechanism; 7. Three-speed PTO mechanism; 8. PTO constant engagement mechanism; 9. Double-speed four-wheel drive mechanism; 10. Rear central mechanism; 11. Built-in brake mechanism; 12. Final drive mechanism;

[0051] 13. Power input shaft; 14. Fourth-speed drive gear; 15. Third-speed drive gear; 16. Second-speed drive gear; 17. First-speed drive gear; 18. PTO constant mesh drive gear;

[0052] 19. Fourth gear driven gear; 20. Second gear driven gear; 21. Third gear driven gear; 22. First gear driven gear; 23. Odd-numbered gear clutch; 24. Odd-numbered high gear driving gear; 25. Odd-numbered low gear driving gear; 26. Even-numbered gear clutch;

[0053] 27. PTO constant mesh driven gear; 28. Even-numbered high gear driving gear; 29. ​​Even-numbered low gear driving gear; 30. Main transmission high and low gear driven gear shaft; 31. Main transmission odd gear output shaft; 32. Main transmission even gear output shaft; 33. Auxiliary transmission low gear driven gear shaft; 34. Auxiliary transmission low gear driven gear; 35. Auxiliary transmission output shaft;

[0054] 36. Reverse drive gear; 37. Reverse driven gear shaft; 38. Reversing idler gear; 39. Power reversing clutch; 40. Reverse driven gear;

[0055] 41. PTO input drive gear; 42. Hydraulic power take-off idler gear; 43. Hydraulic power take-off driven gear; 44. PTO clutch; 45. PTO drive gear shaft; 46. PTO transmission shaft; 47. PTO low-gear driven gear; 48. PTO medium-gear driven gear; 49. PTO high-gear driven gear; 50. PTO output gear shaft; 51. PTO driven gear;

[0056] 52. Power take-off shaft; 53. Small bevel gear shaft; 54. Transfer case driven gear shaft; 55. Four-wheel drive drive gear; 56. Four-wheel drive driven gear; 57. Four-wheel drive double-speed clutch; 58. Double-speed drive gear; 59. Double-speed driven gear; 60. Transfer case output shaft. Detailed Implementation

[0057] The principles and features of the present invention are described below. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0058] Reference Figure 1 As shown, the present invention provides a dual-clutch power shift transmission system structure for a paddy field tractor, comprising:

[0059] The main speed input mechanism 1 is provided with a first output terminal and a second output terminal.

[0060] The main transmission odd gear output mechanism 2 has its input end connected to the main transmission odd gear output shaft 31 via an odd gear clutch 23.

[0061] The input end of the main transmission even-gear output mechanism 3 is connected to the main transmission even-gear output shaft 32 via an even-gear clutch 26.

[0062] The first output end of the main transmission input mechanism 1 is connected to the input end of the main transmission odd gear output mechanism 2 via a synchronizer, or is connected to the input end of the main transmission even gear output mechanism 3.

[0063] The mechanical auxiliary transmission mechanism 4 has its input end connected to the output shaft 32 of the even gear of the main transmission and the output shaft 31 of the odd gear of the main transmission. The output shaft of the mechanical auxiliary transmission mechanism 4 is connected to the rear central mechanism 10.

[0064] PTO clutch 44, the input end of PTO clutch 44 is connected to the second output end of the main transmission input mechanism 1.

[0065] The input end of the three-speed PTO mechanism 7 is connected to the output end of the PTO clutch 44, and the output end of the three-speed PTO mechanism 7 is connected to the PTO constant engagement mechanism 8.

[0066] principle:

[0067] During assembly, the rear central mechanism 10 is generally located within the rear axle housing of the tractor. The two output ends of the rear central mechanism 10 transmit power through the built-in brake mechanism 11 (which reduces the risk of oil leakage from traditional external brakes) to the final drive mechanism 12. The built-in brake mechanism 11 is connected to the final drive mechanism via a spline. The final drive mechanism 12 is used to connect the rear wheels. The rear central mechanism 10 and the final drive mechanism 12 are common names in the prior art (the final drive mechanism 12 is also called the half-shaft assembly). The technical problem to be solved by this invention does not involve the specific structure of these two components, and will not be described in detail here. The synchronizer mentioned in this application and any synchronizers appearing thereafter are all prior art and are common knowledge in the field; their structure and working principle will not be described in detail here.

[0068] During operation, the engine transmits power through the main transmission input mechanism 1, which is equipped with a drive gear. Power is then transmitted to the driven gear via gear transmission, and finally to the main transmission odd-numbered gear output mechanism and the main transmission even-numbered gear output mechanism. These mechanisms are equipped with odd-numbered driven gears and odd-numbered clutches, and even-numbered driven gears and even-numbered clutches. The oil circuit is controlled by a solenoid valve to achieve the switching between odd and even gears. The dual-clutch transmission is controlled by an electronically controlled oil circuit. The odd-numbered and even-numbered gear mechanisms have two synchronizers, one in front and one behind, controlled by an AMT (Automated Manual Transmission) system. The odd-numbered and even-numbered gear switching mechanism must ensure that both synchronizers and clutches engage simultaneously, resulting in high intelligence and comfortable operation. After passing through the main transmission odd-numbered and even-numbered gear output mechanisms, the power reaches the mechanical auxiliary transmission mechanism 4. The mechanical auxiliary transmission mechanism 4 is equipped with mechanical high and low gears, and gear engagement is achieved by switching synchronizers. The PTO clutch 44 directly obtains power from the second output end of the transmission input mechanism, abandoning the scheme of obtaining power from the rear central mechanism 10. The PTO assembly does not need to be mounted on the rear axle housing, saving space along the length of the tractor, thus allowing the PTO clutch 44 and the three-speed PTO mechanism 7 to be arranged. By operating the three-speed PTO mechanism 7 to perform multi-gear shifting, multiple gear shifting is achieved for the PTO constant engagement mechanism 8, increasing the output speed variation capability of the tractor's PTO and adapting to the needs of PTO forward and reverse rotation and various power output functions.

[0069] In this embodiment, power is obtained from the second output end of the power shift mechanism via the PTO clutch 44, saving space along the length of the tractor and providing room for the PTO clutch 44 and the three-speed PTO mechanism 7. The three-speed PTO mechanism 7 increases the tractor's PTO output speed variation capability, making it suitable for various PTO operating modes. Furthermore, the superposition of power reversal and gear shifting through the power shift mechanism and the mechanical pair transmission mechanism 4 enables multi-gear operation in both forward and reverse directions, improving functionality. A dual-clutch power shift mechanism is used, with the electronic control system controlling the hydraulic circuit. The hydraulic circuit simultaneously controls the AMT shift mechanism and the engagement / disengagement of the dual clutch, enabling switching between odd and even gears and solving the problem of large turning radii for tractors in small plots of land.

[0070] Based on the above technical solution, the present invention can be further improved as follows.

[0071] Preferably, in the embodiment, the main transmission input mechanism 1 includes a power input shaft 13, on which a fourth-speed drive gear 14, a third-speed drive gear 15, a second-speed drive gear 16, a first-speed drive gear 17, and a PTO constant mesh drive gear 18 are sequentially fixedly connected.

[0072] The fourth-speed drive gear 14 or the second-speed drive gear 16 is connected to the main transmission even-speed output mechanism 3.

[0073] The third-speed drive gear 15 or the first-speed drive gear 17 is connected to the main transmission odd-speed output mechanism 2 for transmission.

[0074] The PTO constant mesh drive gear 18 is connected to the PTO clutch 44 in a transmission connection.

[0075] The power input shaft 13 can switch between different gears by using the even-numbered gear output mechanism 3 and the odd-numbered gear output mechanism 2 of the main transmission, thereby outputting different torques.

[0076] Preferably, in the embodiment, the main transmission odd gear output mechanism 2 includes a main transmission odd gear input shaft and a main transmission odd gear output shaft 31;

[0077] The main transmission odd-numbered gear input shaft is sequentially connected to a third-speed driven gear 21 and a first-speed driven gear 22. The synchronizer on the main transmission odd-numbered gear input shaft enables the third-speed driven gear 21 to mesh with the third-speed driving gear 15 or the first-speed driven gear 22 to mesh with the first-speed driving gear 17.

[0078] The main transmission odd-gear output shaft 31 and the main transmission odd-gear input shaft are connected by an odd-gear clutch 23. Effective switching of odd gears is achieved through a synchronizer on the main transmission odd-gear input shaft.

[0079] Specifically, the third-speed driven gear 21 and the first-speed driven gear 22 are both rotatably sleeved on the odd-numbered gear input shaft of the main transmission and are always meshed with the gear on the power input shaft 13. The synchronizer is splinedly connected to the odd-numbered gear input shaft of the main transmission and can slide. Its function is to slide to connect with the third-speed driven gear 21 or the first-speed driven gear 22 for transmission, so that the corresponding gear can drive the odd-numbered gear input shaft of the main transmission to rotate.

[0080] Preferably, in the embodiment, the main transmission even-gear output mechanism 3 includes a main transmission even-gear input shaft and a main transmission even-gear output shaft 32;

[0081] The main transmission even-numbered gear input shaft is sequentially connected to a fourth-speed driven gear 19 and a second-speed driven gear 20. The synchronizer on the main transmission even-numbered gear input shaft enables the fourth-speed driven gear 19 to mesh with the fourth-speed driving gear 14 or the second-speed driven gear 20 to mesh with the second-speed driving gear 16.

[0082] The main transmission even-gear output shaft 32 and the main transmission even-gear input shaft are connected by an even-gear clutch 26. Even-gear switching is achieved through a synchronizer on the main transmission even-gear input shaft.

[0083] Specifically, similar to the above, the fourth-speed driven gear 19 and the second-speed driven gear 20 are both rotatably sleeved on the even-speed input shaft of the main transmission and are always meshed with the gear on the power input shaft 13. The synchronizer is splinedly connected to the even-speed input shaft of the main transmission and can slide. Its function is to slide to connect with the fourth-speed driven gear 19 or the second-speed driven gear 20 for transmission, so that the corresponding gear can drive the even-speed input shaft of the main transmission to rotate.

[0084] Specifically, in this embodiment, the fourth-speed drive gear 14, the third-speed drive gear 15, the second-speed drive gear 16, and the first-speed drive gear 17 are equidistantly arranged on the power input shaft 13. Synchronizers are provided between the fourth-speed driven gear 19 and the second-speed driven gear 20, and between the third-speed driven gear 21 and the first-speed driven gear 22. The synchronizers allow any one of the driven gears to mesh with the drive gears, thereby transmitting power from the power input shaft 13 to the even-speed or odd-speed input shaft of the main transmission through the meshing of different gear positions. It should be noted that only one set of driven gears meshes with the drive gears. When the even-speed input shaft of the main transmission is connected to the power input shaft 13, the synchronizer on the odd-speed input shaft is in neutral, and the odd-speed driven gears do not mesh with the power input shaft 13.

[0085] Furthermore, the even-gear clutch 26 and the odd-gear clutch 23 are used to transmit power from the even-gear input shaft and the odd-gear input shaft of the main transmission to the corresponding output shafts. Similarly, only one of the even-gear clutch 26 and the odd-gear clutch 23 can be engaged at any given time. That is, when the power input shaft 13 is connected to the even-gear output mechanism 3 of the main transmission, the even-gear clutch 26 is engaged; when the power input shaft 13 is connected to the odd-gear output mechanism 2 of the main transmission, the odd-gear clutch 23 is engaged, ensuring effective power transmission. During this transmission process, switching between four gears can be achieved.

[0086] Preferably, in the embodiment, the mechanical auxiliary transmission mechanism 4 includes a main transmission high and low gear driven gear shaft 30;

[0087] The high-speed driven gear and the low-speed driven gear are sequentially connected to the main transmission high-speed and low-speed driven gear shaft 30.

[0088] The odd-numbered gear output shaft 31 of the main transmission is connected in sequence with an odd-numbered high gear drive gear 24 and an odd-numbered low gear drive gear 25; the synchronizer on the even-numbered gear output shaft 32 of the main transmission enables the odd-numbered high gear drive gear 24 to mesh with the high gear driven gear or the odd-numbered low gear drive gear 25 to mesh with the low gear driven gear.

[0089] The even-numbered gear output shaft 32 of the main transmission is sequentially connected to an even-numbered high gear drive gear 28 and an even-numbered low gear drive gear 29; the synchronizer on the even-numbered gear output shaft 32 enables the even-numbered high gear drive gear 28 to mesh with the high gear driven gear or the even-numbered low gear drive gear 29 to mesh with the low gear driven gear.

[0090] Specifically, the even-numbered gear output shaft 32 and the odd-numbered gear output shaft 31 of the main transmission are respectively equipped with two types of drive gears, which are always meshed with the gears on the high and low gear driven gear shaft 30 of the main transmission. Furthermore, both the even-numbered gear output shaft 32 and the odd-numbered gear output shaft 31 of the main transmission are equipped with synchronizers. The synchronizers are splinedly connected to the even-numbered gear output shaft 32 and the odd-numbered gear output shaft 31 of the main transmission, and can slide. Their function is to slide to connect with the drive gears of different gears, so that the even-numbered gear output shaft 32 and the odd-numbered gear output shaft 31 of the main transmission drive the corresponding gear drive gear to rotate, thereby transmitting power to the high and low gear driven gear shaft 30 of the main transmission.

[0091] The synchronizer enables the drive gear of one gear to mesh with the high and low gear driven gear shaft 30 of the main transmission. Combined with the high and low gear outputs on the odd gear output shaft 31 and the even gear output shaft 32 of the main transmission, the high and low gear driven gear shaft 30 of the main transmission achieves an eight-speed main transmission.

[0092] Preferably, in the embodiment, the mechanical auxiliary transmission mechanism 4 further includes an auxiliary low-gear driven gear shaft 33; the main high-low gear driven gear shaft 30 is also connected to an auxiliary low-gear driven gear 34, the auxiliary low-gear driven gear 34 is connected to the auxiliary low-gear driven gear shaft 33 through a synchronizer, and the end of the main high-low gear driven gear shaft 30 away from the power input shaft 13 is connected to an auxiliary transmission output shaft 35, the auxiliary transmission output shaft 35 is connected to the rear central mechanism 10.

[0093] The beneficial effect of adopting the above-mentioned further scheme is that, based on the switching between odd and even gears, a two-speed pair shift is performed again through the mechanical pair shifting mechanism 4. Specifically, according to Figure 1As shown, when the synchronizer on the main transmission high / low gear driven gear shaft 30 is disconnected from the auxiliary transmission low gear driven gear 34, the main transmission high / low gear driven gear shaft 30 directly transmits power to the rear central mechanism 10, which is high gear output. When the synchronizer on the main transmission high / low gear driven gear shaft 30 is connected to the auxiliary transmission low gear driven gear 34, the auxiliary transmission low gear driven gear 34 meshes with the auxiliary transmission low gear driven gear shaft 33, and the power of the main transmission high / low gear driven gear shaft 30 is transmitted to the auxiliary transmission low gear driven gear shaft 33, and then transmitted to the auxiliary transmission low gear driven gear 34 through the meshing relationship. The auxiliary transmission low gear driven gear 34 rotates in the opposite direction to the main transmission high / low gear driven gear shaft 30, which plays a role in deceleration.

[0094] Preferably, in the embodiment, it further includes a power reversing mechanism 5, which includes a reverse gear driven gear shaft 37 and a power reversing clutch 39;

[0095] The auxiliary transmission output shaft 35 is sequentially connected to a reverse drive gear 36 and a reverse driven gear 40. The reverse drive gear 36 is connected to the reverse driven gear shaft 37 via a power reversing clutch 39, and the reverse driven gear 40 is connected to the reversing idler gear 38 on the reverse driven gear shaft 37 via the power reversing clutch 39. The power reversing clutch 39 enables switching between forward and reverse modes.

[0096] Specifically, the power reversing clutch 39 has two sets, which respectively control the reverse drive gear 36 and the reverse driven gear 40. When the two sets of power reversing clutches 39 are disengaged, the output power of the main transmission high and low gear driven gear shaft 30 is directly transmitted to the rear central mechanism 10, which is forward. When the two sets of power reversing clutches 39 are connected to the reverse drive gear 36 and the reverse driven gear 40 respectively, the output power of the main transmission high and low gear driven gear shaft 30 drives the reverse driven gear shaft 37 to rotate through the reverse drive gear 36. The reverse driven gear shaft 37 engages with the reverse driven gear 40 through the corresponding reversing idler wheel 38. Since the reversing idler wheel 38 does not change the speed but only the direction, the output power of the main transmission high and low gear driven gear shaft 30 is transmitted to the rear central mechanism 10 in reverse gear, which is reverse.

[0097] Preferably, in the embodiment, one end of the PTO clutch 44 is connected to a PTO input shaft, and a PTO constant mesh driven gear 27 is connected to the PTO input shaft. The PTO constant mesh driven gear 27 is connected to the PTO constant mesh driving gear 18 in a transmission connection.

[0098] The other end of the PTO clutch 44 is connected to a PTO drive gear shaft 45, which is provided with multiple gears with different numbers of teeth.

[0099] The three-speed PTO mechanism 7 includes a PTO transmission shaft 46, on which a PTO low-gear driven gear 47, a PTO medium-gear driven gear 48, and a PTO high-gear driven gear 49 are sequentially connected via meshing sleeves. These gears mesh with gears of different numbers of teeth for transmission. The PTO unit and the PTO constant-mesh unit together provide a total of three-speed PTO, allowing for various PTO speeds to match different agricultural implements.

[0100] Specifically, the PTO input shaft and power input shaft 13 are in a constant meshing state. The switching between odd and even gears does not affect the three-speed PTO mechanism 7. That is, the three-speed PTO mechanism 7 is mainly used to connect agricultural implements; the engine's power output is directly transmitted to the three-speed PTO mechanism 7. The PTO clutch 44 allows for connection and disconnection between the three-speed PTO mechanism 7 and the PTO input shaft. Furthermore, the meshing sleeve on the PTO transmission shaft 46 allows the PTO low-gear driven gear 47, PTO medium-gear driven gear 48, and PTO high-gear driven gear 49 to mesh with gears of different numbers of teeth, enabling the PTO transmission shaft 46 to output three speeds (540 / 760 / 1000). Compared to the traditional two-speed system, this provides more speed selection and a wider range of implement matching options.

[0101] The PTO constant meshing mechanism 8 includes a PTO output gear shaft 50, which is connected to the PTO transmission shaft 46. That is, the output of the PTO transmission shaft 46 is directly transmitted to the PTO output gear shaft 50. The PTO output gear shaft 50 is connected to a power output shaft 52 through a PTO driven gear 51. The power output shaft 52 is used to connect different agricultural implements.

[0102] Preferably, in this embodiment, the PTO input shaft is further provided with a PTO input drive gear 41, which is connected to a hydraulic power take-off mechanism 6. The main function of the hydraulic power take-off mechanism 6 is to drive the gear pump, providing power to the power shift control valve and steering lift system. This unit uses helical gear transmission, which is more efficient and smoother than traditional spur gear transmission, reducing the risk of abnormal noise. The hydraulic power take-off housing is integrated into the rear axle housing, making installation more convenient. This unit also features forced lubrication, reducing the risk of bearing gear failure at high speeds. Specifically, the hydraulic power take-off mechanism 6 includes a hydraulic power take-off idler gear 42 and a hydraulic power take-off driven gear 43. The hydraulic power take-off driven gear 43 is connected to the PTO input shaft, and the hydraulic power take-off idler gear 42 meshes with the hydraulic power take-off driven gear 43 to drive the gear pump. The hydraulic power take-off mechanism 6 is prior art and will not be described in detail here.

[0103] Preferably, in the embodiment, a small bevel gear shaft 53 is also connected between the mechanical pair transmission mechanism 4 and the rear central mechanism 10, and a double-speed four-wheel drive mechanism 9 is driven and connected to the small bevel gear shaft 53.

[0104] Specifically, the double-speed four-wheel drive mechanism 9 includes a transfer case driven gear shaft 54, a four-wheel drive double-speed clutch 57, and a transfer case output shaft 60. The transfer case driven gear shaft 54 ​​is connected to the four-wheel drive drive gear 55 and is connected to the double-speed drive gear 58 through the four-wheel drive double-speed clutch 57. The transfer case output shaft 60 is connected to the four-wheel drive driven gear 56 and the double-speed driven gear 59. The double-speed drive gear 58 and the double-speed driven gear 59 mesh and drive each other, and the four-wheel drive driven gear 56 and the four-wheel drive drive gear 55 mesh and drive each other, providing power to the front drive axle. The four-wheel drive double-speed clutch 57 realizes three modes: two-wheel drive, four-wheel drive, and double-speed. This unit adopts an electronic control system with three-way hydraulic circuit control, which is more convenient to operate compared with the traditional mechanical transfer case.

[0105] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0106] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0107] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0108] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0109] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0110] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A dual-clutch power shift transmission system structure for a paddy field tractor, characterized in that, include: The main speed input mechanism (1) is provided with a first output terminal and a second output terminal; The main transmission odd gear output mechanism (2) has an input end connected to the main transmission odd gear output shaft (31) via an odd gear clutch (23). The input end of the main transmission even gear output mechanism (3) is connected to the main transmission even gear output shaft (32) through the even gear clutch (26). The first output end of the main transmission input mechanism (1) is connected to the input end of the main transmission odd gear output mechanism (2) via a synchronizer, or is connected to the input end of the main transmission even gear output mechanism (3). A mechanical auxiliary transmission mechanism (4) includes a main transmission high and low gear driven gear shaft (30). The input end of the main transmission high and low gear driven gear shaft (30) is connected to the main transmission even gear output shaft (32) and the main transmission odd gear output shaft (31). The end of the main transmission high and low gear driven gear shaft (30) away from the main transmission input mechanism (1) is connected to an auxiliary transmission output shaft (35). The auxiliary transmission output shaft (35) is connected to a rear central mechanism (10). The input end of the PTO clutch (44) is connected to the second output end of the main transmission input mechanism (1) in a transmission connection. The input end of the three-speed PTO mechanism (7) is connected to the output end of the PTO clutch (44), and the output end of the three-speed PTO mechanism (7) is connected to the PTO constant engagement mechanism (8). It also includes a power reversing mechanism (5), which includes a reverse gear driven gear shaft (37) and a power reversing clutch (39). The reverse gear drive gear (36) and the reverse gear driven gear (40) are connected in sequence on the auxiliary transmission output shaft (35). The reverse gear drive gear (36) is connected to the reverse gear driven gear shaft (37) through a power reversing clutch (39), or the reverse gear driven gear (40) is connected to the idler gear (38) on the reverse gear driven gear shaft (37) through a power reversing clutch (39).

2. The structure of a dual-clutch power shift transmission system for a paddy field tractor according to claim 1, characterized in that, The main transmission input mechanism (1) includes a power input shaft (13), on which a fourth-speed drive gear (14), a third-speed drive gear (15), a second-speed drive gear (16), a first-speed drive gear (17), and a PTO constant mesh drive gear (18) are sequentially fixedly connected. The four-speed drive gear (14) or the two-speed drive gear (16) is connected to the main transmission even-speed output mechanism (3) for transmission. The three-speed drive gear (15) or the one-speed drive gear (17) is connected to the main transmission odd-speed output mechanism (2) for transmission. The PTO constant mesh drive gear (18) is connected to the PTO clutch (44) for transmission.

3. The structure of a dual-clutch power shift transmission system for a paddy field tractor according to claim 2, characterized in that, The main transmission odd gear output mechanism (2) includes a main transmission odd gear input shaft and a main transmission odd gear output shaft (31). The main transmission odd-numbered gear input shaft is connected in sequence with a third-speed driven gear (21) and a first-speed driven gear (22). The synchronizer on the main transmission odd-numbered gear input shaft enables the third-speed driven gear (21) to mesh with the third-speed driving gear (15) or the first-speed driven gear (22) to mesh with the first-speed driving gear (17). The output shaft (31) of the main transmission odd gear and the input shaft of the main transmission odd gear are connected by an odd gear clutch (23).

4. The structure of a dual-clutch power shift transmission system for a paddy field tractor according to claim 3, characterized in that, The main transmission even-gear output mechanism (3) includes a main transmission even-gear input shaft and a main transmission even-gear output shaft (32). The main transmission even-numbered gear input shaft is connected in sequence with a fourth-speed driven gear (19) and a second-speed driven gear (20). The synchronizer on the main transmission even-numbered gear input shaft enables the fourth-speed driven gear (19) to mesh with the fourth-speed driving gear (14) or the second-speed driven gear (20) to mesh with the second-speed driving gear (16). The main transmission even-gear output shaft (32) and the main transmission even-gear input shaft are connected by an even-gear clutch (26).

5. The structure of a dual-clutch power shift transmission system for a paddy field tractor according to claim 4, characterized in that, The high-gear driven gear and the low-gear driven gear are connected sequentially on the main transmission high and low gear driven gear shaft (30); The odd-numbered gear output shaft (31) of the main transmission is connected in sequence with an odd-numbered gear high-gear drive gear (24) and an odd-numbered gear low-gear drive gear (25); the synchronizer on the even-numbered gear output shaft (32) of the main transmission enables the odd-numbered gear high-gear drive gear (24) to mesh with the high-gear driven gear or the odd-numbered gear low-gear drive gear (25) to mesh with the low-gear driven gear. The even-numbered gear output shaft (32) of the main transmission is connected in sequence with an even-numbered high gear drive gear (28) and an even-numbered low gear drive gear (29); the synchronizer on the even-numbered gear output shaft (32) of the main transmission enables the even-numbered high gear drive gear (28) to mesh with the high gear driven gear or the even-numbered low gear drive gear (29) to mesh with the low gear driven gear.

6. The structure of a dual-clutch power shift transmission system for a paddy field tractor according to claim 5, characterized in that, The mechanical auxiliary transmission mechanism (4) also includes an auxiliary low-gear driven gear shaft (33); the main high and low gear driven gear shaft (30) is also connected to an auxiliary low-gear driven gear (34), which is connected to the auxiliary low-gear driven gear shaft (33) via a synchronizer.

7. The structure of a dual-clutch power shift transmission system for a paddy field tractor according to claim 2, characterized in that, One end of the PTO clutch (44) is connected to a PTO input shaft, and a PTO constant mesh driven gear (27) is connected to the PTO input shaft. The PTO constant mesh driven gear (27) is connected to the PTO constant mesh driving gear (18) in a transmission connection. The other end of the PTO clutch (44) is connected to the PTO drive gear shaft (45), which has multiple gears with different numbers of teeth. The three-speed PTO mechanism (7) includes a PTO gearbox (46), on which a PTO low-gear driven gear (47), a PTO medium-gear driven gear (48), and a PTO high-gear driven gear (49) are connected in sequence via a synchronizer. The PTO low-gear driven gear (47), PTO medium-gear driven gear (48), and PTO high-gear driven gear (49) mesh with gears of different numbers of teeth for transmission.

8. The structure of a dual-clutch power shift transmission system for a paddy field tractor according to claim 7, characterized in that, The PTO input shaft is also provided with a PTO input drive gear (41), and the PTO input drive gear (41) is connected to a hydraulic power take-off mechanism (6).

9. The structure of a dual-clutch power shift transmission system for a paddy field tractor according to claim 1, characterized in that, A small bevel gear shaft (53) is also connected between the mechanical pair transmission mechanism (4) and the rear central mechanism (10), and a double-speed four-wheel drive mechanism (9) is connected to the small bevel gear shaft (53).

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