Wheel side travel drive device

Abstract

The present invention relates to a driving device, in particular to a wheel-side travel driving device, comprising: a radial variable hydraulic motor, including a variable device, an eccentric crankshaft, a bearing sleeve and a diameter reducing device movably arranged on the eccentric crankshaft, a driving device movably connected to the bearing sleeve, the diameter reducing device is also connected to the bearing sleeve, the variable device is used to control the diameter reducing device to push the bearing sleeve to move radially to adjust the eccentricity of the eccentric crankshaft, and the driving device is used to drive the bearing sleeve to drive the eccentric crankshaft to rotate; a braking device, which is arranged on the radial variable hydraulic motor; a braking sleeve, which is respectively connected to the eccentric crankshaft and the braking device; a speed reduction device, which is arranged on the braking device and connected to the braking sleeve; an unlocking device, which is respectively connected to the braking sleeve and the speed reduction device, and is used to connect or disconnect the braking sleeve and the speed reduction device. The wheel-side travel driving device adjusts the output torque and output speed of the radial variable hydraulic motor through the eccentric device and the variable device, and facilitates traction through the unlocking device.

Description

Technical Field

[0001] The invention relates to a driving device, in particular to a wheel-side traveling driving device. Background Art

[0002] Agricultural machinery, forest machinery, etc. mostly use wheel-side drive devices consisting of hydraulic motors and planetary reducers for driving.

[0003] The hydraulic motors of the existing wheel-side drive devices mainly adopt axial piston hydraulic motors and radial piston hydraulic motors. Although the radial piston hydraulic motor has a large output torque, the output speed is relatively low, which cannot meet the speed requirements of agricultural machinery when it is transferred, resulting in a slow walking speed during the transfer. If the speed of the radial piston hydraulic motor output is increased, the output torque will be reduced. Therefore, the existing radial piston hydraulic motor cannot meet the requirements of both large torque output and high speed output.

[0004] In addition, since the existing wheel hub is directly connected to the planetary reducer, it cannot be directly towed when a failure occurs. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a wheel-side walking drive device, and the specific technical solution is as follows:

[0006] A wheel-side walking drive device comprises: a radial variable hydraulic motor, comprising a variable device, an eccentric crankshaft, a bearing sleeve and a reducing device movably arranged on the eccentric crankshaft, and a driving device movably connected to the bearing sleeve, the reducing device is also connected to the bearing sleeve, the variable device is used to control the reducing device to push the bearing sleeve to move radially to adjust the eccentricity of the eccentric crankshaft, and the driving device is used to drive the bearing sleeve to drive the eccentric crankshaft to rotate; a braking device, arranged on the radial variable hydraulic motor; a braking sleeve, respectively connected to the eccentric crankshaft and the braking device; a reduction device, arranged on the braking device and connected to the braking sleeve; and an unlocking device, respectively connected to the braking sleeve and the reduction device, for connecting or disconnecting the braking sleeve and the reduction device.

[0007] Preferably, the variable diameter device includes: a first piston, which is movably arranged on one side of the eccentric part of the eccentric crankshaft and connected to the first adjustment side of the eccentric adjustment hole of the bearing sleeve; and a third piston, which is movably arranged on the other side of the eccentric part and connected to the second adjustment side of the bearing sleeve; wherein the first adjustment side is arranged opposite to the second adjustment side, and the first piston and the third piston are used to push the bearing sleeve to move radially to adjust the eccentricity of the eccentric crankshaft.

[0008] Furthermore, the variable diameter device also includes: a second piston, which is movably disposed on the eccentric portion and connected to the first adjusting side.

[0009] Wherein, the diameter-changing device further comprises: a piston spring, and the piston spring is arranged between the first piston and the eccentric part.

[0010] Furthermore, the variable device includes: a variable valve core, which is movably mounted on one end of the eccentric crankshaft, and a first annular oil groove is provided on the variable valve core; and a variable spring, which is movably mounted on the eccentric crankshaft, and whose two ends are respectively connected to the eccentric crankshaft and the variable valve core; wherein the variable valve core is used to respectively drive the first piston and the third piston through the variable oil circuit on the radial variable hydraulic motor and the variable spring so that the connecting oil circuit on the eccentric crankshaft drives the first piston and the third piston through the first oil groove.

[0011] Furthermore, the variable valve core includes: an outer valve core, which is provided with an outer valve hole and a variable piston ring, and the variable piston ring is movably arranged in the variable valve hole; and an inner valve core, which is rotatably arranged in the outer valve hole and movably sleeved on the eccentric crankshaft, and the first oil groove is arranged on the inner valve core.

[0012] Preferably, the driving device includes: a swivel cylinder, which is rotatably provided on the radial variable hydraulic motor; a plunger assembly, which is movably provided on the plunger assembly and movably abuts against the bearing sleeve; and an oil distribution plate, which is rotatably provided on the radial variable hydraulic motor and is connected to the swivel cylinder through an oil circuit, and is used to drive the plunger assembly through the swivel cylinder to push the bearing sleeve to drive the eccentric crankshaft to rotate.

[0013] Preferably, the unlocking device includes: an unlocking shaft, which is arranged at one end of the center wheel of the reduction device and is provided with a key tooth; a brake sleeve, which is arranged on the radial variable hydraulic motor and is provided with a key groove matching the key tooth at one end, the unlocking shaft is movably inserted in the brake sleeve, and the key tooth is movably inserted in the key groove; a rear cover, which is arranged at one end of the rotating housing of the reduction device and is provided with an unlocking hole with a diameter not smaller than that of the center wheel, and the unlocking hole is arranged opposite to the unlocking shaft; and an unlocking seat, which is arranged on the unlocking hole.

[0014] Furthermore, a positioning device is provided on the unlocking seat and the brake sleeve, and is respectively located at two ends of the central gear of the reduction device.

[0015] Furthermore, the positioning device includes: a positioning ring, which is arranged in the brake sleeve and is arranged opposite to the end of the unlocking shaft; and a positioning block, which is arranged on the unlocking seat and is arranged opposite to the end of the central gear.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] A wheel-side walking drive device provided by the present invention realizes the adjustment of the output torque and output speed of a radial variable hydraulic motor through an eccentric device and a variable device, and facilitates traction through an unlocking device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of an embodiment;

[0019] Figure 2 It is a schematic diagram of the structure of the radial variable hydraulic motor in a large displacement state;

[0020] Figure 3 yes Figure 2 A partial enlarged view of

[0021] Figure 4 It is a schematic diagram of the structure of a radial variable hydraulic motor in a small displacement state;

[0022] Figure 5 yes Figure 4 A partial enlarged view of

[0023] Figure 6 It is a cross-sectional view of a radial variable hydraulic motor along the radial direction;

[0024] Figure 7 It is a schematic diagram of the structure of the radial variable hydraulic motor after the motor housing is hidden;

[0025] Figure 8 It is a schematic diagram of the assembly of the eccentric crankshaft, variable valve core, and bearing sleeve;

[0026] Fig. 9 It is a schematic diagram of the structure of an eccentric crankshaft;

[0027] Fig.10 It is a cross-sectional view of the eccentric crankshaft;

[0028] Fig.11 It is a structural diagram of the variable valve core;

[0029] Fig.12 It is a cross-sectional view of the variable valve core;

[0030] Fig.13 is a schematic diagram of the structure of the rear housing;

[0031] Fig.14is a front view of the rear housing;

[0032] Fig.15 It is a schematic diagram of the structure of the bearing sleeve;

[0033] Fig.16 is a front view of the bearing sleeve;

[0034] Fig.17 It is a structural diagram of the swing cylinder;

[0035] Fig.18 It is a cross-sectional view of the swing cylinder;

[0036] Fig.19 is a schematic diagram of the structure of the plunger assembly;

[0037] Fig. 20 is a cross-sectional view of the plunger assembly;

[0038] Fig.21 It is a schematic diagram of the structure of a double-headed key;

[0039] Fig. 22 It is a schematic diagram of the assembly of the braking device, the deceleration device and the unlocking device;

[0040] Fig.23 It is an exploded view of the unlocking device;

[0041] Fig.24 It is a schematic diagram of the structure of the back cover;

[0042] Fig.25 It is a schematic diagram of the structure of the unlocking seat;

[0043] Fig.26 This is the front view of the unlocking seat;

[0044] Fig. 27 It is a schematic diagram of the central gear and the unlocking shaft.

[0045] In the figure: reduction gear 1, unlocking shaft 11, key tooth 111, rear cover 12, unlocking hole 121, unlocking seat 13, hexagonal hole 131, unlocking sealing groove 133, limiting fixing groove 132, unlocking sealing ring 18, inner gear ring 21, rotary housing 20, central gear 22, unlocking screw hole 221, planetary gear 23, planetary carrier 24, brake device 3, brake sleeve 31, key groove 311, positioning device 25, positioning ring 251, positioning block 252, unlocking sealing ring 18, hexagonal hole 131, eccentric crankshaft 5, eccentric part 50, first piston hole 51, second piston hole 52, third piston hole 53, connecting oil path 54, small displacement oil path 56, large displacement oil path 55, first piston 61, second piston 62, third piston 63, piston spring 69, variable valve core 64, outer valve core 641, inner valve core 642, first oil groove 643, second oil groove 644, second through hole 645, outer valve hole 646, variable piston ring 647, variable spring 65, bearing sleeve 46, eccentric adjustment hole 461, first adjustment side 462, second adjustment side 463, swing cylinder 48, fourth piston hole 481, fourth oil circuit 482, plunger assembly 49, motor housing 4, drive chamber 441, variable valve hole 442, oil supply seat 41, front housing 42, rear housing 43, variable oil circuit 45, oil distribution plate 71, shuttle valve 72, drive oil circuit 73, high-pressure oil pipe 74, double-headed key 75. DETAILED DESCRIPTION

[0046] The present invention will be further described with reference to the accompanying drawings.

[0047] like Figures 1 to 27 As shown, a wheel-side travel drive device includes a radial variable hydraulic motor, a brake device 3, a brake sleeve 31, a speed reducer 1 and an unlocking device. The radial variable hydraulic motor includes a variable device, an eccentric crankshaft 5, a bearing sleeve 46 and a diameter reducing device movably arranged on the eccentric crankshaft 5, and a driving device movably connected to the bearing sleeve 46, the diameter reducing device is also connected to the bearing sleeve 46, the variable device is used to control the diameter reducing device to push the bearing sleeve 46 to move radially to adjust the eccentricity of the eccentric crankshaft 5, and the driving device is used to drive the bearing sleeve 46 to drive the eccentric crankshaft 5 to rotate; the brake device 3 is installed on the radial variable hydraulic motor; the brake sleeve 31 is respectively connected to the eccentric crankshaft 5 and the brake device 3; the speed reducer 1 is installed on the brake device 3, and the speed reducer 1 is also connected to the brake sleeve 31; the unlocking device is respectively connected to the brake sleeve 31 and the speed reducer 1, and is used to connect or disconnect the brake sleeve 31 and the speed reducer 1.

[0048] The radial variable hydraulic motor is a radial piston hydraulic motor. The motor housing 4 of the radial variable hydraulic motor is provided with a driving chamber 441, a variable valve hole 442 and a variable oil circuit 45, and the variable valve hole 442 is respectively connected to the driving chamber 441 and the variable oil circuit 45; the two ends of the eccentric crankshaft 5 are rotatably mounted in the driving chamber 441 through bearings, and the eccentric crankshaft 5 is provided with a connecting oil circuit 54, an eccentric part 50, a first piston hole 51, a second piston hole 52 and a third piston hole 53 arranged on the eccentric part 50, and a small displacement oil circuit 56 connected to the first piston hole 51 and the second piston hole 52 and a large displacement oil circuit 55 connected to the third piston hole 53; the first piston hole 51 and the second piston hole 52 are located on the same side of the eccentric part 50, and are arranged in parallel, and the first piston hole 51 is connected to the second piston hole 52. The third piston hole 53 is located on the other side of the eccentric part 50, that is, the first piston hole 51, the second piston hole 52 and the third piston hole 53 are respectively located on both sides of the eccentric crankshaft 5.

[0049] The diameter-changing device includes: a first piston 61 , a second piston 62 and a third piston 63 . The first piston 61 is movably disposed in the first piston hole 51 ; the second piston 62 is movably disposed in the second piston hole 52 ; and the third piston 63 is movably disposed in the third piston hole 53 .

[0050] The bearing sleeve 46 is provided with an eccentric adjustment hole 461, and the eccentric adjustment hole 461 includes a first adjustment side surface 462 and a second adjustment side surface 463 which are arranged opposite to each other. The eccentric adjustment hole 461 is movably sleeved on the eccentric portion 50 of the eccentric crankshaft 5 and is located in the driving chamber 441. The bearing sleeve 46 is also arranged opposite to the first piston 61, the second piston 62 and the third piston 63 respectively. The ends of the first piston 61 and the second piston 62 movably abut against the first adjustment side surface 462 of the eccentric adjustment hole 461, and the end of the third piston 63 movably abuts against the second adjustment side surface 463; the first piston 61, the second piston 62 and the third piston 63 are used to push the bearing sleeve 46 to move radially to adjust the eccentricity of the eccentric crankshaft 5.

[0051] The variable device is movably installed in the variable valve hole 442, and is also movably sleeved on one end of the eccentric crankshaft 5, and is located at the end where the connecting oil circuit 54 is provided. The variable device is also communicated with the variable oil circuit 45, the small displacement oil circuit 56 and the large displacement oil circuit 55 respectively; wherein the radial diameter reducing device includes a large displacement state and a small displacement state, and the variable device is used to switch between the large displacement state and the small displacement state; in the large displacement state, the connecting oil circuit 54 is communicated with the large displacement oil circuit 55 so that the third piston 63 pushes the bearing sleeve 46 to increase the eccentricity of the eccentric crankshaft 5; in the small displacement state, the connecting oil circuit 54 is communicated with the small displacement oil circuit 56 so that the first piston 61 pushes the bearing sleeve 46 to reduce the eccentricity of the eccentric crankshaft 5.

[0052] Agricultural machinery requires high torque and low speed during normal operation, and high speed and low torque during field transfer. The existing quantitative hydraulic motor requires a large flow rate when outputting high speed, which increases the power of the hydraulic motor. The radial variable device of the hydraulic motor achieves the switching between high torque and low speed and low torque and high speed by adjusting the eccentricity of the eccentric crankshaft 5, which can reduce the flow rate of the hydraulic system and the power of the engine.

[0053] The first piston 61 and the second piston 62 are respectively located at two ends of the bearing sleeve 46 , so that the bearing sleeve 46 can be subjected to uniform force.

[0054] The variable valve hole 442 is isolated from the driving chamber 441 by a variable device.

[0055] The eccentric adjustment hole 461 is a square hole, and the eccentric portion 50 is a square. The eccentric adjustment hole 461 and the eccentric portion 50 can enable the bearing sleeve 46 to move along a fixed radial direction to prevent the bearing sleeve 46 from rotating around the axis biased toward the crankshaft.

[0056] In order to prevent the first piston 61 and the second piston 62 from freely moving along the axis and to keep the bearing sleeve 46 in a balanced state, a piston spring 69 is also included. The piston spring 69 is arranged between the first piston 61 and the first piston hole 51 and between the second piston 62 and the second piston hole 52.

[0057] The variable device includes a variable valve core 64 and a variable spring 65. The variable valve core 64 is provided with a first oil groove 643, the variable valve core 64 is movably arranged in the variable valve hole 442, and is movably sleeved on the eccentric crankshaft 5, the first oil groove 643 is respectively arranged opposite to the connecting oil path 54, the small displacement oil path 56 and the large displacement oil path 55, so that the connecting oil path 54 is communicated with the small displacement oil path 56 through the first oil groove 643, or the connecting oil path 54 is communicated with the large displacement oil path 55 through the first oil groove 643; the variable spring 65 is movably arranged in the variable valve hole 442, and is movably sleeved on the eccentric crankshaft 5, and the two ends of the variable spring 65 are respectively connected to the variable valve core 64 and the eccentric crankshaft 5; wherein the variable valve hole 442 and the variable spring 65 are respectively located at the two ends of the variable piston ring 647 of the variable valve core 64, and are used to adjust the position of the variable valve core 64.

[0058] The variable spring 65 can be a disc spring, which can make the structure compact.

[0059] like Fig.11 and Fig.12As shown, in order to make the variable control more reliable and convenient for processing, the variable valve core 64 includes an outer valve core 641 and an inner valve core 642; the outer valve core 641 is provided with an outer valve hole 646 and a variable piston ring 647, the outer valve core 641 is movably arranged in the variable valve hole 442, and the variable piston ring 647 is against the variable valve hole 442; the inner valve core 642 is rotatably arranged in the outer valve hole 646 through a ball 649, and is movably sleeved on the eccentric crankshaft 5, and a first oil groove 643 and a second oil groove 644 are provided on the inner circular surface of the inner valve core 642, the first oil groove 643 is respectively arranged opposite to the small displacement oil circuit 56 and the large displacement oil circuit 55, the second oil groove 644 is respectively arranged opposite to the large displacement oil circuit 55, and a second through hole 645 is provided at the bottom of the second oil groove 644, and the second through hole 645 is respectively communicated with the second oil groove 644 and the outer valve hole 646. The outer valve core 641 and the inner valve core 642 are both provided with raceways matching the ball 649. The ball 649 enables the outer valve core 641 and the inner valve core 642 to form a rotational connection. The inner valve core 642 can rotate with the eccentric crankshaft 5 to avoid relative rotation between the inner valve core 642 and the eccentric crankshaft 5, while the outer valve core 641 does not rotate, thereby improving the sealing between the variable piston ring 647 and the variable valve hole 442.

[0060] The difference between the radial variable hydraulic motor and the existing radial hydraulic motor lies in the radial variable diameter device. The radial variable hydraulic motor also includes a driving device. The driving device includes a swing cylinder 48, a plunger assembly 49 and an oil distribution plate 71; the swing cylinder 48 is rotatably arranged on the radial variable hydraulic motor; the plunger assembly 49 is movably arranged on the plunger assembly 49 and movably abuts against the bearing sleeve 46; the oil distribution plate 71 is rotatably arranged on the radial variable hydraulic motor and communicates with the swing cylinder 48 through an oil circuit, and is used to drive the plunger assembly 49 through the swing cylinder 48 to push the bearing sleeve 46 to drive the eccentric crankshaft 5 to rotate. Specifically, the motor housing 4 includes an oil supply seat 41, a front housing 42 and a rear housing 43, the oil supply seat 41 is fixed to one end of the front housing 42, the rear housing 43 is fixed to the other end of the front housing 42, and the front housing 42 is provided with a variable valve hole 442 and a variable oil circuit 45. The rear housing 43 is provided with a driving chamber 441, and the driving chamber 441 is coaxially arranged with the variable valve hole 442. The oil supply seat 41 is provided with an oil inlet and an oil outlet, and the oil distribution plate 71 is rotatably installed in the oil supply seat 41. The oil distribution plate 71 is provided with multiple oil distribution oil circuits, and the oil distribution oil circuits include an oil inlet oil circuit communicating with the oil inlet and an oil outlet oil circuit communicating with the oil outlet. The oil port of the shuttle valve is communicated with the oil inlet through the oil inlet oil circuit. The oil distribution plate 71 is connected to the eccentric crankshaft 5 through a double-headed key 75, and the high-pressure oil pipe 74 is located in the double-headed key 75. The double-headed key 75 is used for transmission, so that the oil distribution plate 71 rotates synchronously with the eccentric crankshaft 5, thereby realizing the sequential switching of the oil circuits, and the hydraulic oil sequentially drives the driving device, and the driving device drives the eccentric crankshaft 5 to rotate continuously through the bearing sleeve 46. The driving device of this embodiment is provided with five, and the driving device includes a plunger assembly 49 and a swing cylinder 48. The swing cylinder 48 is provided with a fourth piston hole 481 and a fourth oil circuit 482 communicated with the fourth piston hole 481. The swing cylinder 48 is rotatably arranged in the driving chamber 441, and the plunger assembly 49 is movably inserted in the fourth piston hole 481 of the swing cylinder 48. The plunger assembly 49 movably rests on the outer circumferential surface of the bearing sleeve 46; the hydraulic oil enters the driving oil circuit 73 on the motor housing 4 through the oil inlet circuit on the oil distribution plate 71, and then enters the fourth piston hole 481 in the swing cylinder 48 through the fourth oil circuit 482. The hydraulic oil pushes the plunger assembly 49, and the plunger assembly 49 pushes the bearing sleeve 46 to rotate, and the bearing sleeve 46 pushes the eccentric crankshaft 5 to rotate. The five plunger assemblies 49 push the eccentric bearing sleeve 46 in turn to realize the continuous rotation of the eccentric crankshaft 5.

[0061] One end of the connecting oil circuit 54 is located at the end of the eccentric crankshaft 5, and the other end of the connecting oil circuit 54 is located on one side of the eccentric crankshaft 5. The oil inlet of the large displacement oil circuit 55 is located on the other side of the eccentric crankshaft 5, and the oil outlet of the large displacement oil circuit 55 is communicated with the third piston hole 53. The oil inlet of the small displacement oil circuit 56 is located on the other side of the eccentric crankshaft 5, and is located on one side of the oil inlet of the large displacement oil circuit 55, and the oil outlet of the small displacement oil circuit 56 is communicated with the first piston hole 51. In the large displacement state, the oil outlet of the small displacement oil circuit 56 is communicated with the cavity in which the variable spring 65 is installed between the variable valve core 64 and the eccentric crankshaft 5, that is, it is communicated with the variable valve hole 442, which is used to store the hydraulic oil discharged from the first piston hole 51 and the second piston hole 52. In the small displacement state, the oil inlet of the large displacement oil circuit 55 is connected to the second oil groove 644, and the hydraulic oil discharged from the third piston hole 53 enters the outer valve hole 646 through the large displacement oil circuit 55, and enters the cavity between the variable valve core 64 and the eccentric crankshaft 5.

[0062] The reduction device 1 includes a planetary reducer, which includes a rotary housing 20, a central gear 22, planetary gears 23 and a planet carrier 24. An inner gear ring 21 is provided at one end of the rotary housing 20, and the inner gear ring 21 meshes with the planetary gears 23. The planetary gears 23 are rotatably mounted on the planet carrier 24, and the planetary gears 23 mesh with the central gear 22. The planet carrier 24 is mounted on the brake device 3.

[0063] The brake device 3 includes a brake seat 30, a large brake piston 32, a small brake piston 33, a first brake spring 37, a second brake spring 36 and a brake pad 39. The brake seat 30 is mounted on the frame, one end of the brake seat 30 is connected to the radial variable hydraulic motor, and the other end of the brake seat 30 is rotatably connected to the rotary housing 20 of the planetary reducer through a bearing. The brake seat 30 is provided with a brake chamber 301, a service brake oil port 34 and a parking brake oil port 35 communicating with the brake chamber 301, the large brake piston 32 is slidably mounted in the brake chamber 301, and is provided with a service brake oil groove 321 communicating with the service brake oil port 34 and a parking brake oil groove 322 communicating with the parking brake oil port 35. The small brake piston 33 is movably mounted on the large brake piston 32, and a second brake spring 36 is installed between the small brake piston 33 and the large brake piston 32. The small brake piston 33 is arranged opposite to the brake pad 39, and the brake pad 39 includes a dynamic friction plate and a static friction plate, and the brake pad 39 is mounted on the brake sleeve 31. A first brake spring 37 is installed between the brake large piston 32 and the brake chamber 301. The brake large piston 32 realizes the tightening and loosening of the brake pad 39 by pushing the brake small piston 33, thereby realizing the control of braking and parking. The brake device 3 is a prior art and will not be described in detail here.

[0064] The driving unlocking device includes an unlocking shaft 11, a brake sleeve 31, a rear cover 12 and an unlocking seat 13; the unlocking shaft 11 is arranged at one end of the central gear 22 and is an integral structure with the central gear 22. A key tooth 111 is provided on the unlocking shaft 11. In order to improve the reliability of the transmission, there are at least one key tooth 111, which can be arranged in a ring array; the brake sleeve 31 is installed on the radial variable hydraulic motor and is connected to the brake device 3. A key groove 311 is provided at one end of the brake sleeve 31. The key groove 311 matches the key tooth 111. The key groove 311 corresponds to the key tooth 111 one by one. The key tooth 111 makes the unlocking shaft 11 form a spline shaft, and the key groove 311 makes the brake sleeve 31 form a spline sleeve. The unlocking shaft 11 is movably inserted in the brake sleeve 31, and the key tooth 111 is movably inserted in the key groove 311; the spline structure facilitates the disassembly and assembly of the central gear 22. The rear cover 12 is fixed to one end of the rotary housing 20 of the planetary reducer by screws. The rear cover 12 is provided with an unlocking hole 121, which is a threaded hole, and the diameter of the unlocking hole 121 is greater than or equal to the diameter of the central gear 22, so that the central gear 22 can be taken out of the unlocking hole 121. The unlocking hole 121 is coaxially arranged with the central gear 22. The unlocking seat 13 is a cylindrical structure, and the outer circumferential surface of the unlocking seat 13 is provided with an external thread. The unlocking seat 13 is installed on the unlocking hole 121 by threads, and the threads are convenient for disassembly and assembly.

[0065] The planetary reducer includes a rotary housing 20 , a central gear 22 , planetary gears 23 and a planet carrier 24 . An inner gear ring 21 is provided at one end of the rotary housing 20 . The inner gear ring 21 meshes with the planetary gears 23 . The planetary gears 23 are rotatably mounted on the planet carrier 24 . The planetary gears 23 mesh with the central gear 22 .

[0066] In order to prevent the central gear 22 from moving forward and backward along the axis, the driving unlocking device also includes a positioning device 25. The positioning device 25 is arranged on the unlocking seat 13 and the brake sleeve 31, and is respectively located at the two ends of the central gear 22 to achieve the limiting of the two ends of the central gear 22. Specifically, the positioning device 25 includes a positioning ring 251 and a positioning block 252. The positioning ring 251 is fixed in the brake sleeve 31 and is arranged opposite to the end of the unlocking shaft 11. The positioning ring 251 can adopt a hole-use retaining spring. The positioning block 252 is fixed in the limiting fixing groove 132 of the unlocking seat 13 and is arranged opposite to the end of the central gear 22. The positioning block 252 can be movably pressed against the end of the central gear 22. The positioning block 252 can be made of self-lubricating material.

[0067] In order to facilitate the removal of the central gear 22 , an unlocking screw hole 221 is provided at the end of the central gear 22 . When disassembling, the central gear 22 can be pulled out by screwing in the screw.

[0068] In order to improve the sealing performance, the driving unlocking device also includes an unlocking sealing ring 18, which is installed in the unlocking sealing groove 133 of the unlocking seat 13. The unlocking sealing groove 133 is an annular groove and faces the back cover 12. The unlocking sealing ring 18 is used to press against the back cover 12 to achieve sealing.

[0069] In order to facilitate the disassembly and assembly of the unlocking seat 13 , a hexagonal hole 131 is provided on the unlocking seat 13 . The hexagonal hole 131 matches a hexagonal wrench and is used to disassemble and assemble the unlocking seat 13 by using the hexagonal wrench.

[0070] The central gear 22 of the planetary gear 23 is an integral structure with the unlocking shaft 11 and is connected to the transmission shaft. The central gear 22 is meshed with the planetary gears 23 , and the planetary gears 23 are meshed with the inner gear ring 21 .

[0071] When traction is required, insert the hexagonal wrench into the hexagonal hole 131 of the unlocking seat 13, then remove the unlocking seat 13 with the hexagonal wrench, then screw the long bolt into the unlocking screw hole 221 of the center gear 22, and then pull out the center gear 22 with a tool such as a puller to separate the center gear 22 from the planetary gear 23 and the unlocking shaft 11 from the unlocking sleeve. At this time, the rotary box 20 can rotate freely, so traction can be carried out.

[0072] When the wheel side walking device is damaged and fails, the unlocking seat 13 can be screwed out, and an M10 bolt can be screwed into the unlocking screw hole 221 on the central gear 22 to pull the central gear 22 out of the reducer, and the vehicle can be towed away from the work site by other vehicles.

[0073] Large displacement working status:

[0074] The high-pressure oil introduced into the oil supply port enters the connecting oil circuit 54 through the shuttle valve 72 and the high-pressure oil pipe 74, and the variable oil circuit 45 does not enter the oil. The variable valve core 64 is at one end of the variable valve hole 442 close to the oil supply seat 41 under the action of the variable spring 65. At this time, the first oil groove 643 is connected to the connecting oil circuit 54 and the large-displacement oil circuit 55 respectively. The hydraulic oil in the connecting oil circuit 54 enters the large-displacement oil circuit 55 through the first oil groove 643, and then enters the third piston hole 53. The hydraulic oil pushes the third piston 63 to extend radially, while the first piston 61 and the second piston 62 retract radially, thereby pushing the bearing sleeve 46 to move radially, increasing the eccentricity of the eccentric crankshaft 5, and then realizing the output of large torque. At this time, the output speed is relatively low. In the large-displacement state, it is mainly used to drive agricultural machinery to travel at low speed and high load. The hydraulic oil in the first piston hole 51 and the third piston hole 53 enters the cavity between the variable valve core 64 and the eccentric crankshaft 5 through the small-displacement oil circuit 56.

[0075] Small displacement operation status:

[0076] The high-pressure oil introduced into the oil supply port enters the connecting oil circuit 54 through the shuttle valve 72 and the high-pressure oil pipe 74, and the variable oil circuit 45 enters oil. The hydraulic oil pushes the variable valve core 64 to move toward the eccentric crankshaft 5. At this time, the first oil groove 643 is connected with the connecting oil circuit 54 and the small displacement oil circuit 56 respectively. The hydraulic oil in the connecting oil circuit 54 enters the small displacement oil circuit 56 through the first oil groove 643, and then enters the first piston hole 51 and the second piston hole 52. The hydraulic oil pushes the first piston 61 and the second piston 62 to extend radially, while the third piston 63 retracts radially, thereby pushing the bearing sleeve 46 to move radially, reducing the eccentricity of the eccentric crankshaft 5, making the displacement of the radial variable hydraulic motor smaller, and the speed of the planetary reducer can be doubled when the flow input is the same, so as to meet the requirements of small load and high speed travel when the agricultural machinery changes the site. The hydraulic oil discharged from the third piston hole 53 enters the outer valve hole 646 through the large displacement oil circuit 55.

[0077] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the protection scope of the claims of the present invention.

Claims

1. A wheel-side travel drive device, characterized in that: include: A radial variable hydraulic motor, comprising a variable device, an eccentric crankshaft (5), a bearing sleeve (46) movably arranged on the eccentric crankshaft (5) and a diameter reducing device, and a driving device movably connected to the bearing sleeve (46), the diameter reducing device also being connected to the bearing sleeve (46), the variable device being used to control the diameter reducing device to push the bearing sleeve (46) to move radially so as to adjust the eccentricity of the eccentric crankshaft (5), and the driving device being used to drive the bearing sleeve (46) to drive the eccentric crankshaft (5) to rotate; A braking device (3), arranged on the radial variable hydraulic motor; A brake sleeve (31) connected to the eccentric crankshaft (5) and the brake device (3) respectively; A deceleration device (1) is provided on the braking device (3) and is connected to the braking sleeve (31); and An unlocking device, connected to the brake sleeve (31) and the deceleration device (1) respectively, and used for connecting or disconnecting the brake sleeve (31) and the deceleration device (1); The diameter-changing device comprises: a first piston (61), the first piston (61) being movably disposed on one side of the eccentric portion (50) of the eccentric crankshaft (5) and connected to a first adjustment side surface (462) of the eccentric adjustment hole (461) of the bearing sleeve (46); and a third piston (63), the third piston (63) being movably disposed on the other side of the eccentric portion (50) and connected to the second adjustment side surface (463) of the bearing sleeve (46); The first adjustment side surface (462) and the second adjustment side surface (463) are arranged opposite to each other, and the first piston (61) and the third piston (63) are used to push the bearing sleeve (46) to move radially to adjust the eccentricity of the eccentric crankshaft (5); The unlocking device comprises: An unlocking shaft (11) is arranged at one end of the center wheel of the reduction device (1) and is provided with key teeth (111); A brake sleeve (31) is arranged on the radial variable hydraulic motor and has a keyway (311) matching the key tooth (111) at one end, the unlocking shaft (11) is movably inserted into the brake sleeve (31), and the key tooth (111) is movably inserted into the keyway (311); a rear cover (12) disposed at one end of the rotary housing (20) of the reduction gear (1) and provided with an unlocking hole (121) having a diameter not less than that of the center wheel, the unlocking hole (121) being arranged opposite to the unlocking shaft (11); and The unlocking seat (13) is arranged on the unlocking hole (121).

2. A wheel-side travel drive device according to claim 1, characterized in that: The diameter-changing device further comprises: a second piston (62), the second piston (62) being movably disposed on the eccentric portion (50) and connected to the first adjusting side surface (462).

3. A wheel-side travel drive device according to claim 1, characterized in that: The diameter-changing device further comprises a piston spring (69), wherein the piston spring (69) is arranged between the first piston (61) and the eccentric portion (50).

4. A wheel-side travel drive device according to claim 1, characterized in that: The variable device comprises: a variable valve core (64), the variable valve core (64) being movably sleeved on one end of the eccentric crankshaft (5), and the variable valve core (64) being provided with an annular first oil groove (643); and a variable spring (65), the variable spring (65) being movably sleeved on the eccentric crankshaft (5), and having two ends respectively connected to the eccentric crankshaft (5) and the variable valve core (64); The variable valve core (64) is used to enable the communicating oil path (54) on the eccentric crankshaft (5) to respectively drive the first piston (61) and the third piston (63) through the first oil groove (643) via the variable oil path (45) and the variable spring (65) on the radial variable hydraulic motor.

5. A wheel-side travel drive device according to claim 4, characterized in that: The variable valve core (64) comprises: An outer valve core (641), the outer valve core (641) being provided with an outer valve hole (646) and a variable piston ring (647), the variable piston ring (647) being movably disposed in the variable valve hole (442); and An inner valve core (642), the inner valve core (642) is rotatably disposed in the outer valve hole (646) and movably sleeved on the eccentric crankshaft (5), and the first oil groove (643) is disposed on the inner valve core (642).

6. The wheel-side travel drive device according to claim 1, characterized in that: The driving device comprises: A swing cylinder (48), the swing cylinder (48) being rotatably mounted on the radial variable hydraulic motor; A plunger assembly (49), the plunger assembly (49) being movably disposed on the plunger assembly (49) and movably resting against the bearing sleeve (46); and An oil distribution plate (71) is rotatably mounted on the radial variable hydraulic motor and is in communication with the swing cylinder (48) via an oil path, and is used to drive the plunger assembly (49) through the swing cylinder (48) to push the bearing sleeve (46) to drive the eccentric crankshaft (5) to rotate.

7. The wheel-side travel drive device according to claim 1, characterized in that: The unlocking device further comprises: a positioning device (25), wherein the positioning device (25) is arranged on the unlocking seat (13) and the braking sleeve (31), and is respectively located at two ends of the central gear (22) of the reduction device (1).

8. The wheel-side travel drive device according to claim 7, characterized in that: The positioning device (25) comprises: a positioning ring (251), the positioning ring (251) being arranged in the braking sleeve (31) and being arranged opposite to an end of the unlocking shaft (11); and A positioning block (252), the positioning block (252) being arranged on the unlocking seat (13) and being arranged opposite to an end of the central gear (22).

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