Agricultural machine hydraulic power drive axle assembly

Abstract

The utility model belongs to the field of agricultural machinery drive mechanism technology, especially point to a kind of agricultural machinery hydraulic power drive axle assembly, including the power input shaft being rotated and cooperated on the box, transmission one axle, transmission two axle and transmission three axle, one end of power input shaft is transmission coupled with the output end of hydraulic motor, power input shaft is transmission coupled with transmission one axle by advancing block transmission component, transmission one axle is transmission coupled with transmission two axle by constant meshing gear set, transmission two axle is transmission coupled with transmission three axle by high-low variable speed block transmission component, the central transmission gear meshing transmission of the shell of differential assembly is fixedly sleeved on transmission three axle, the left and right two half axles of differential assembly are respectively transmission coupled with left drive wheel, right drive wheel.The utility model is with hydraulic motor as power source, by integrated optimization mechanical transmission structure, reasonable amplification hydraulic motor output torque and expand transmission speed ratio range, to meet the low speed, heavy load's large torque output demand.

Description

Technical fields:

[0001] This utility model belongs to the technical field of agricultural machinery transmission mechanism, and specifically refers to an agricultural machinery hydraulic power drive axle assembly. Background technology:

[0002] The drive axle assembly of agricultural machinery (such as tractors and harvesters) is the core component of its transmission system. Traditional agricultural machinery drive axle assemblies use internal combustion engines as the power source and rely on complex mechanical gearboxes to achieve gear shifting and reverse functions. However, this method is complex and demands high skill from the driver, as complex field operating conditions require frequent switching of speed and torque to adapt to different loads. Traditional gear shifting is laborious and requires the driver to have extensive experience to judge and select the optimal gear; otherwise, it can easily cause engine stalling or insufficient power, increasing the driver's workload and affecting the quality of work. Summary of the Invention:

[0003] The purpose of this utility model is to provide a hydraulic power drive axle assembly for agricultural machinery, which uses a hydraulic motor as a power source to achieve stepless speed change. Furthermore, by integrating and optimizing the mechanical transmission structure, the output torque of the hydraulic motor is reasonably amplified and the transmission ratio range is expanded to meet the high torque output requirements of low speed and heavy load.

[0004] This utility model is implemented as follows:

[0005] A hydraulic power drive axle assembly for agricultural machinery includes a power input shaft, a first transmission shaft, a second transmission shaft, and a third transmission shaft rotatably fitted onto a housing. One end of the power input shaft extends outside the housing and is driven by the output end of a hydraulic motor. A variable displacement pump, driven by the hydraulic motor, is driven by an external agricultural machinery engine. The power input shaft is driven by the first transmission shaft via a forward gear transmission assembly. The first transmission shaft is driven by the second transmission shaft via a constant mesh gear set. The second transmission shaft is driven by the third transmission shaft via a high / low gear transmission assembly. A central transmission gear, meshing with the housing of a differential assembly, is fixedly mounted on the third transmission shaft. The left and right half-shafts of the differential assembly are driven by the left and right drive wheels located outside the housing, respectively.

[0006] In the above-mentioned agricultural machinery hydraulic power drive axle assembly, the hydraulic motor and the variable pump are separate structures, with the hydraulic motor fixed on the housing and the variable pump located outside the housing;

[0007] Alternatively, the hydraulic motor and the variable pump may be an integrated structure fixed on the housing, with an HST input shaft rotatably mounted on the housing. One end of the HST input shaft extends out of the housing and is fitted with a drive pulley, while the other end of the HST input shaft extends out of the housing and is connected to the input shaft of the variable pump.

[0008] In the aforementioned agricultural machinery hydraulic power drive axle assembly, the forward gear transmission component includes a first gear drive gear and a second gear drive gear rotatably mounted on the power input shaft. A first gear driven gear meshing with the first gear drive gear and a second gear driven gear meshing with the second gear drive gear are fixedly mounted on the transmission shaft. The power input shaft is connected to the first gear drive gear or the second gear drive gear through a first-second gear meshing sleeve or a synchronizer to rotate synchronously.

[0009] In the above-mentioned agricultural machinery hydraulic power drive axle assembly, the constant mesh gear set includes a constant mesh driving gear fixedly sleeved on a transmission shaft, and a constant mesh driven gear meshing with the constant mesh driving gear is sleeved on the transmission shaft.

[0010] In the aforementioned agricultural machinery hydraulic power drive axle assembly, the high and low gear transmission component includes a high-gear drive gear and a low-gear drive gear fixedly sleeved on the second transmission shaft. The third transmission shaft is rotatably fitted with a high-gear driven gear that meshes with the high-gear drive gear and a low-gear driven gear that meshes with the low-gear drive gear. The third transmission shaft is engaged with the high-gear driven gear or the low-gear driven gear through a high-low gear meshing sleeve or a synchronizer to rotate synchronously.

[0011] In the aforementioned agricultural machinery hydraulic power drive axle assembly, a left output shaft and a right output shaft located on the same axis are rotatably connected to the housing. The opposite ends of the left and right output shafts extend outward from the housing and are respectively connected to the left and right drive wheels. The left and right half-shafts of the differential assembly are rotatably connected to the housing and fitted with output drive gears. The opposite ends of the left and right output shafts are fitted with output driven gears that mesh with the corresponding output drive gears.

[0012] In the above-mentioned hydraulic power drive axle assembly for agricultural machinery, a four-shaft drive shaft and a four-drive drive shaft are rotatably connected to the housing. A drive gear is fixedly mounted on the three-shaft drive shaft. A driven gear that meshes with the drive gear is rotatably mounted on the four-shaft drive shaft. The four-shaft drive shaft is engaged with the driven gear through a four-drive engagement sleeve or a synchronizer to achieve synchronous rotation of the three-shaft drive shaft and the four-shaft drive shaft. The four-drive drive shaft and the four-shaft drive shaft are connected and their axes are perpendicular to each other.

[0013] In the above-mentioned hydraulic power drive axle assembly for agricultural machinery, a four-wheel drive drive bevel gear is fixedly sleeved on the four-wheel drive shaft, a four-wheel drive driven bevel gear that meshes with the four-wheel drive drive bevel gear is fixedly sleeved on the inner end of the four-wheel drive shaft, and the outer end of the four-wheel drive shaft extends out of the housing and is connected to the external rear drive mechanism for transmission.

[0014] In the above-mentioned agricultural machinery hydraulic power drive axle assembly, one end of the transmission three shafts extends out of the housing and is connected to a brake that is fixedly engaged with the housing or the outside.

[0015] The outstanding advantages of this utility model compared to the prior art are:

[0016] This invention uses a hydraulic motor as a power source, enabling stepless speed regulation. To avoid excessive displacement and pressure of hydraulic components due to high torque requirements, the mechanical transmission structure is integrated and optimized to reasonably amplify the output torque of the hydraulic motor and expand the transmission speed ratio range, thereby meeting the high torque output requirements under low speed and heavy load. Attached image description:

[0017] Figure 1 This is a simplified transmission diagram of the drive axle assembly according to Embodiment 1 of this utility model;

[0018] Figure 2 This is a simplified transmission diagram of the drive axle assembly in Embodiment 2 of this utility model.

[0019] In the diagram: 1. Housing; 2. Power input shaft; 3. Drive shaft 1; 4. Drive shaft 2; 5. Drive shaft 3; 6. Hydraulic motor; 7. Variable displacement pump; 8. Differential assembly; 9. Central drive gear; 10. Left drive wheel; 11. Right drive wheel; 12. HST input shaft; 13. Drive pulley; 14. First gear drive gear; 15. Second gear drive gear; 16. First gear driven gear; 17. Second gear driven gear; 18. First and second gear meshing sleeve or synchronizer; 19. Constant mesh drive gear; 20. Constant mesh driven gear 21. High-gear drive gear; 22. Low-gear drive gear; 23. High-gear driven gear; 24. Low-gear driven gear; 25. High / low gear meshing sleeve or synchronizer; 26. Left output shaft; 27. Right output shaft; 28. Output drive gear; 29. ​​Output driven gear; 30. Four-wheel drive shaft; 31. Four-wheel drive drive shaft; 32. Transfer drive gear; 33. Transfer driven gear; 34. Four-wheel drive meshing sleeve or synchronizer; 35. Four-wheel drive drive bevel gear; 36. Four-wheel drive driven bevel gear; 37. Brake. Detailed implementation method:

[0020] The present invention will be further described below with reference to specific embodiments. See also: Figure 1 —2:

[0021] Example 1:

[0022] A hydraulic power drive axle assembly for agricultural machinery includes a power input shaft 2, a first transmission shaft 3, a second transmission shaft 4, and a third transmission shaft 5 rotatably fitted on a housing 1. One end of the power input shaft 2 extends out of the housing 1 and is driven by the output end of a hydraulic motor 6. A variable pump 7, driven by the hydraulic motor 6, is driven by an external agricultural machinery engine. The power input shaft 2 is driven by the first transmission shaft 3 through a forward gear transmission assembly. The first transmission shaft 3 is driven by the second transmission shaft 4 through a constant mesh gear set. The second transmission shaft 4 is driven by the third transmission shaft 5 through a high / low gear transmission assembly. A central transmission gear 9 is fixedly fitted on the third transmission shaft 5 and meshes with the housing of a differential assembly 8. The left and right half-shafts of the differential assembly 8 are driven by the left drive wheel 10 and the right drive wheel 11 located outside the housing 1, respectively.

[0023] In this embodiment, the hydraulic motor 6 and the variable pump 7 are separate structures. The hydraulic motor 6 is fixed on the housing 1, while the variable pump 7 is located outside the housing 1 and is directly connected to the agricultural machinery engine.

[0024] This utility model uses a hydraulic motor 6 as a power source, which can realize stepless speed change. In order to avoid the hydraulic components having extremely large displacement and pressure due to high torque demand, the mechanical transmission structure is integrated and optimized to reasonably amplify the output torque of the hydraulic motor 6 and expand the transmission speed ratio range, so as to meet the high torque output demand of low speed and heavy load.

[0025] The forward gear transmission assembly can have three or four gears in its power transmission path. In this embodiment, the specific number of gears and transmission structure of the forward gear transmission assembly are as follows: The forward gear transmission assembly includes a first gear drive gear 14 and a second gear drive gear 15 rotatably mounted on the power input shaft 2. A first gear driven gear 16 meshing with the first gear drive gear 14 and a second gear driven gear 17 meshing with the second gear drive gear 15 are fixedly mounted on the transmission shaft 3. The power input shaft 2 is connected to the first gear drive gear 14 or the second gear drive gear 15 through a first-second gear meshing sleeve or a synchronizer 18 to rotate synchronously.

[0026] In order to stabilize transmission and effectively amplify the output torque of hydraulic motor 6 under limited gear engagement, the constant mesh gear set includes a constant mesh driving gear 19 fixedly sleeved on the first transmission shaft 3, and a constant mesh driven gear 20 meshing with the constant mesh driving gear 19 is sleeved on the second transmission shaft 4.

[0027] The specific structure of the high and low speed transmission assembly is as follows: the high and low speed transmission assembly includes a high-speed drive gear 21 and a low-speed drive gear 22 fixedly sleeved on the transmission shaft 4. The transmission shaft 5 is rotatably fitted with a high-speed driven gear 23 that meshes with the high-speed drive gear 21 and a low-speed driven gear 24 that meshes with the low-speed drive gear 22. The transmission shaft 5 is connected to the high-speed driven gear 23 or the low-speed driven gear 24 through a high and low gear meshing sleeve or a synchronizer 25 to rotate synchronously. That is, the high and low speed gears are combined with multiple forward gears to obtain a transmission gear range that doubles in number and greatly expands the speed ratio range.

[0028] Furthermore, the transmission structure specifically adopted between the left and right half-shafts of the differential assembly 8 and the left drive wheel 10 and right drive wheel 11 is as follows: a left output shaft 26 and a right output shaft 27 located on the same axis are rotatably connected to the housing 1. The opposite ends of the left output shaft 26 and the right output shaft 27 extend outward from the housing 1 and are respectively connected to the left drive wheel 10 and the right drive wheel 11. The left and right half-shafts of the differential assembly 8 are rotatably connected to the housing 1 and are fitted with output drive gears 28. The opposite ends of the left output shaft 26 and the right output shaft 27 are fitted with output driven gears 29 that mesh with the corresponding output drive gears 28.

[0029] Considering that some agricultural machinery requires four-wheel drive, this product designs the drive axle assembly as a split-drive system, allowing for switchable power transmission paths of both four-wheel drive and standalone front drive. Specifically, a four-shaft drive shaft 30 and a four-wheel drive shaft 31 are rotatably connected to the housing 1. A drive gear 32 is fixedly mounted on the three-shaft drive shaft 5, and a driven gear 33 meshing with the drive gear 32 is rotatably mounted on the four-shaft drive shaft 30. The four-shaft drive shaft 30 engages with the driven gear 33 via a four-wheel drive engagement sleeve or a synchronizer 34 to achieve synchronous rotation between the three-shaft drive shaft 5 and the four-shaft drive shaft 30. The four-wheel drive shaft 31 is connected to the four-shaft drive shaft 30, and their axes are perpendicular. Furthermore, a four-wheel drive drive bevel gear 35 is fixedly mounted on the four-shaft drive shaft 30, and a four-wheel drive driven bevel gear 36 meshing with the drive gear 35 is fixedly mounted on the inner end of the four-wheel drive shaft 31. The outer end of the four-wheel drive shaft 31 extends beyond the housing 1 and is connected to an external rear drive mechanism.

[0030] In order to achieve the purpose of transmission braking of the drive axle, one end of the transmission three shafts 5 extends out of the housing 1 and is connected to a brake 37 that is fixedly engaged with the housing 1 or the outside.

[0031] Example 2:

[0032] This embodiment is basically the same in structure as Embodiment 1 above, with the main difference being that the hydraulic motor 6 and the variable pump 7 are an integrated structure fixed to the housing 1. An HST input shaft 12 is rotatably mounted on the housing 1. One end of the HST input shaft 12 extends out of the housing 1 and is fitted with a transmission pulley 13. The other end of the HST input shaft 12 extends out of the housing 1 and is connected to the input shaft of the variable pump 7. In other words, in this embodiment, the hydraulic motor 6 and the variable pump 7 are an integrated assembly structure, directly fixed to the housing 1, and connected to an external agricultural machinery engine via the HST input shaft 12 and the transmission pulley 13.

[0033] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. A hydraulic power drive axle assembly for agricultural machinery, characterized in that: It includes a power input shaft (2), a transmission shaft (3), a transmission shaft (4), and a transmission shaft (5) that are rotatably fitted on the housing (1). One end of the power input shaft (2) extends out of the housing (1) and is connected to the output end of the hydraulic motor (6). The variable pump (7) connected to the hydraulic motor (6) is connected to the external agricultural machinery engine. The power input shaft (2) is connected to the transmission shaft (3) through the forward gear transmission assembly. The transmission shaft (3) is connected to the transmission shaft (4) through the constant mesh gear set. The transmission shaft (4) is connected to the transmission shaft (5) through the high and low gear transmission assembly. The transmission shaft (5) is fixedly fitted with a central transmission gear (9) that meshes with the housing of the differential assembly (8). The left and right half shafts of the differential assembly (8) are respectively connected to the left drive wheel (10) and the right drive wheel (11) located outside the housing (1).

2. The agricultural machinery hydraulic power drive axle assembly according to claim 1, characterized in that: The hydraulic motor (6) and the variable pump (7) are separate structures. The hydraulic motor (6) is fixed on the housing (1), and the variable pump (7) is located outside the housing (1). Alternatively, the hydraulic motor (6) and the variable pump (7) are an integral structure and fixed on the housing (1). The housing (1) is rotatably fitted with an HST input shaft (12). One end of the HST input shaft (12) extends out of the housing (1) and is fitted with a transmission pulley (13). The other end of the HST input shaft (12) extends out of the housing (1) and is connected to the input shaft of the variable pump (7) for transmission.

3. The agricultural machinery hydraulic power drive axle assembly according to claim 1, characterized in that: The forward gear transmission assembly includes a first gear drive gear (14) and a second gear drive gear (15) rotatably mounted on the power input shaft (2). The transmission shaft (3) is fixedly fitted with a first gear driven gear (16) meshing with the first gear drive gear (14) and a second gear driven gear (17) meshing with the second gear drive gear (15). The power input shaft (2) is engaged with the first gear drive gear (14) or the second gear drive gear (15) through a first-second gear engagement sleeve or a synchronizer (18) to rotate synchronously.

4. The agricultural machinery hydraulic power drive axle assembly according to claim 1, characterized in that: The constant mesh gear set includes a constant mesh driving gear (19) fixedly sleeved on the first transmission shaft (3), and a constant mesh driven gear (20) meshing with the constant mesh driving gear (19) is sleeved on the second transmission shaft (4).

5. The agricultural machinery hydraulic power drive axle assembly according to claim 1, characterized in that: The high and low gear transmission assembly includes a high gear drive gear (21) and a low gear drive gear (22) fixedly mounted on the transmission shaft (4). The transmission shaft (5) is rotatably mounted with a high gear driven gear (23) meshing with the high gear drive gear (21) and a low gear driven gear (24) meshing with the low gear drive gear (22). The transmission shaft (5) is connected to the high gear driven gear (23) or the low gear driven gear (24) through a high and low gear meshing sleeve or a synchronizer (25) to rotate synchronously.

6. The agricultural machinery hydraulic power drive axle assembly according to claim 1, characterized in that: The housing (1) is rotatably connected to a left output shaft (26) and a right output shaft (27) located on the same axis. The opposite ends of the left output shaft (26) and the right output shaft (27) extend outward from the housing (1) and are respectively connected to the left drive wheel (10) and the right drive wheel (11). The left half shaft and the right half shaft of the differential assembly (8) are rotatably connected to the housing (1) and are fitted with output drive gears (28). The opposite ends of the left output shaft (26) and the right output shaft (27) are fitted with output driven gears (29) that mesh with the corresponding side output drive gears (28).

7. The agricultural machinery hydraulic power drive axle assembly according to claim 1, characterized in that: The housing (1) is rotatably connected to a four-shaft drive shaft (30) and a four-wheel drive shaft (31). A drive gear (32) is fixedly mounted on the three-shaft drive shaft (5). A driven gear (33) meshing with the drive gear (32) is rotatably mounted on the four-shaft drive shaft (30). The four-shaft drive shaft (30) is connected to the driven gear (33) through a four-wheel drive engagement sleeve or a synchronizer (34) to achieve synchronous rotation of the three-shaft drive shaft (5) and the four-shaft drive shaft (30). The four-wheel drive shaft (31) is connected to the four-shaft drive shaft (30) and their axes are perpendicular to each other.

8. The agricultural machinery hydraulic power drive axle assembly according to claim 7, characterized in that: The four-wheel drive drive bevel gear (35) is fixedly mounted on the four-wheel drive shaft (30), and the inner end of the four-wheel drive drive shaft (31) is fixedly mounted with a four-wheel drive driven bevel gear (36) that meshes with the four-wheel drive drive bevel gear (35). The outer end of the four-wheel drive drive shaft (31) extends out of the housing (1) and is connected to the external rear drive mechanism for transmission.

9. The agricultural machinery hydraulic power drive axle assembly according to claim 1, characterized in that: One end of the transmission triaxial shaft (5) extends out of the housing (1) and is connected to a brake (37) that is fixedly engaged with the housing (1) or the outside.

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