Hydraulic motor radial variable device and radial variable hydraulic motor

Abstract

The utility model relates to a hydraulic motor radial variable device and a radial variable hydraulic motor. The utility model discloses a hydraulic motor radial variable displacement device. An eccentric crankshaft is rotationally arranged in a driving cavity of a motor box body; the first piston is movably arranged in the first piston hole; the third piston is movably arranged in the third piston hole; the eccentric part is movably sleeved with an eccentric adjusting hole of the bearing sleeve, and the first piston and the third piston abut against the two sides of the eccentric adjusting hole respectively; and the variable device is movably arranged on the eccentric crankshaft, is movably positioned in a variable valve hole of the motor box body, and is used for enabling the communication oil way to be communicated with the large-displacement oil way to enable the third piston to push the bearing sleeve to increase the eccentric distance of the eccentric crankshaft or enabling the communication oil way to be communicated with the small-displacement oil way to enable the first piston to push the bearing sleeve to reduce the eccentric distance of the eccentric crankshaft. According to the radial variable hydraulic motor, the eccentric distance is adjusted through the first piston and the third piston, then adjustment of the output torque and the rotating speed of the hydraulic motor is achieved, and the requirements of different working states for the output torque and the rotating speed are met.

Description

Technical Field

[0001] The utility model relates to a hydraulic motor, in particular to a radial variable device of a hydraulic motor and a radial variable hydraulic motor. Background Art

[0002] Some large agricultural machinery adopts hydraulic motors, and the hydraulic motors mainly adopt axial piston hydraulic motors and radial piston hydraulic motors. The hydraulic motor, planetary reducer and braking device form a wheel side drive device.

[0003] Although the radial piston hydraulic motor has a large output torque, its output speed is relatively small, and it cannot meet the speed requirements for agricultural machinery during transfer, resulting in a slow walking speed during transfer. If the output speed of the radial piston hydraulic motor is increased, the output torque will decrease. Therefore, the existing radial piston hydraulic motors cannot meet the requirements of both large torque output and high speed output. Summary of the Invention

[0004] To solve the above problems, the utility model provides a radial variable device for a hydraulic motor. The specific technical solution is as follows:

[0005] A radial variable device for a hydraulic motor includes: an eccentric crankshaft rotatably arranged in a drive cavity of a motor housing, and provided with a communication oil passage, an eccentric portion, a first piston hole and a third piston hole arranged on both sides of the eccentric portion, a small displacement oil passage communicating with the first piston hole, and a large displacement oil passage communicating with the third piston hole; a first piston movably arranged in the first piston hole; a third piston movably arranged in the third piston hole and oppositely arranged with the first piston; a bearing sleeve provided with an eccentric adjustment hole, the eccentric adjustment hole movably sleeved on the eccentric portion, the first piston and the third piston respectively abutted against a first adjustment side surface and a second adjustment side surface of the eccentric adjustment hole; and a variable device movably arranged on the eccentric crankshaft and movably located in a variable valve hole of the motor housing, for communicating the communication oil passage with the large displacement oil passage to enable the third piston to push the bearing sleeve to increase the eccentricity of the eccentric crankshaft or communicating the communication oil passage with the small displacement oil passage to enable the first piston to push the bearing sleeve to reduce the eccentricity of the eccentric crankshaft.

[0006] Preferably, the radial variable device further includes: a second piston movably arranged in a second piston hole of the eccentric portion and abutted against the first adjustment side surface, and the second piston hole communicates with the small displacement oil passage.

[0007] Preferably, the radial variable device further includes: a piston spring arranged between the first piston and the eccentric portion.

[0008] Preferably, the variable device includes: a variable spool valve, which is movably sleeved on one end of the eccentric crankshaft, and a circular first oil groove is provided on the variable spool valve; and a variable spring, which is movably sleeved on the eccentric crankshaft and is connected to the eccentric crankshaft and the variable spool valve at both ends respectively; wherein, the variable spool valve is used to make the communication oil passage communicate with the large displacement oil passage or the small displacement oil passage respectively through the variable oil passage on the variable valve hole and the variable spring via the first oil groove.

[0009] Further, the variable spool valve includes: an outer spool valve, 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 spool valve, which is rotatably arranged in the outer valve hole and is movably sleeved on the eccentric crankshaft, and the first oil groove is arranged on the inner spool valve.

[0010] A radial variable hydraulic motor includes: the above-mentioned hydraulic motor radial variable device; and a high-pressure oil pipe, both ends of which are respectively connected to the eccentric crankshaft and the oil distribution disc, and the high-pressure oil pipe is used to make the communication oil passage communicate with the oil inlet through the oil distribution disc.

[0011] Preferably, the radial variable hydraulic motor further includes a shuttle valve, which is arranged on the oil distribution disc and communicates with the high-pressure oil pipe.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] A hydraulic motor radial variable device provided by the present invention drives the first piston and the third piston through the variable device, adjusts the eccentricity of the eccentric crankshaft through the first piston and the third piston, and further realizes the adjustment of the output torque and speed of the hydraulic motor, meeting the requirements for output torque and speed in different working states. Description of the Drawings

[0014] Figure 1 is a schematic structural diagram of the hydraulic motor radial variable device;

[0015] Figure 2 is a cross-sectional view of the hydraulic motor radial variable device;

[0016] Figure 3 is a schematic structural diagram of the eccentric crankshaft;

[0017] Figure 4 is a cross-sectional view of the eccentric crankshaft;

[0018] Figure 5 is a schematic structural diagram of the variable spool valve;

[0019] Figure 6 is a cross-sectional view of the variable spool valve;

[0020] Figure 7 It is a schematic structural view of a bearing sleeve;

[0021] Figure 8 It is a front view of the bearing sleeve;

[0022] Figure 9 It is a schematic structural view of a radial variable hydraulic motor in the large displacement state;

[0023] Figure 10 It is Figure 9 a partial enlarged view of;

[0024] Figure 11 It is a schematic structural view of a radial variable hydraulic motor in the small displacement state;

[0025] Figure 12 It is Figure 11 a partial enlarged view of;

[0026] Figure 13 It is a cross-sectional view of the radial variable hydraulic motor along the radial direction;

[0027] Figure 14 It is a schematic structural view of the radial variable hydraulic motor after hiding the motor housing;

[0028] Figure 15 It is a schematic structural view of the rear housing;

[0029] Figure 16 It is a front view of the rear housing;

[0030] Figure 17 It is a schematic structural view of the swing cylinder;

[0031] Figure 18 It is a cross-sectional view of the swing cylinder;

[0032] Figure 19 It is a schematic structural view of the plunger assembly;

[0033] Figure 20 It is a cross-sectional view of the plunger assembly;

[0034] Figure 21 It is a schematic structural view of the double-headed key;

[0035] Figure 22 It is a schematic diagram of the connection between the radial variable hydraulic motor, the brake and the planetary reducer.

[0036] In the figure: eccentric crankshaft 5, eccentric part 50, first piston hole 51, second piston hole 52, third piston hole 53, connecting oil passage 54, small displacement oil passage 56, large displacement oil passage 55, first piston 61, second piston 62, third piston 63, piston spring 69, variable spool valve 64, outer spool 641, inner spool 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 passage 482, plunger assembly 49, motor housing 4, drive cavity 441, variable valve hole 442, oil supply seat 41, front housing 42, rear housing 43, variable oil passage 45, oil distribution disc 71, shuttle valve 72, drive oil passage 73, high-pressure oil pipe 74, double-headed key 75. Detailed implementation mode

[0037] The present utility model will be further described below in conjunction with the accompanying drawings.

[0038] As Figures 1 to 22As shown in the figure, a radial variable device for a hydraulic motor includes an eccentric crankshaft 5, a first piston 61, a second piston 62, a third piston 63, a bearing sleeve 46, and a variable device. A driving cavity 441, a variable valve hole 442, and a variable oil passage 45 are provided on a motor housing 4. The variable valve hole 442 communicates with the driving cavity 441 and the variable oil passage 45 respectively; both ends of the eccentric crankshaft 5 are rotatably installed in the driving cavity 441 through bearings. The eccentric crankshaft 5 is provided with a communicating oil passage 54, an eccentric portion 50, a first piston hole 51, a second piston hole 52, and a third piston hole 53 provided on the eccentric portion 50, a small displacement oil passage 56 communicating with the first piston hole 51 and the second piston hole 52, and a large displacement oil passage 55 communicating with 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 portion 50 and are arranged in parallel, and the first piston hole 51 communicates with the second piston hole 52. The third piston hole 53 is located on the other side of the eccentric portion 50, that is, the first piston hole 51 and the second piston hole 52 and the third piston hole 53 are respectively located on both sides of the eccentric crankshaft 5. The first piston 61 is movably arranged in the first piston hole 51; the second piston 62 is movably arranged in the second piston hole 52; the third piston 63 is movably arranged in the third piston hole 53; the bearing sleeve 46 is provided with an eccentric adjustment hole 461. The eccentric adjustment hole 461 includes a first adjustment side surface 462 and a second adjustment side surface 463 arranged oppositely. The eccentric adjustment hole 461 is movably sleeved on the eccentric portion 50 of the eccentric crankshaft 5 and is located in the driving cavity 441. The bearing sleeve 46 is also respectively arranged opposite to the first piston 61, the second piston 62, and the third piston 63. The ends of the first piston 61 and the second piston 62 are movably abutted against the first adjustment side surface 462 of the eccentric adjustment hole 461, and the end of the third piston 63 is movably abutted against the second adjustment side surface 463; 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 provided with the communicating oil passage 54. The variable device also communicates with the variable oil passage 45, the small displacement oil passage 56, and the large displacement oil passage 55 respectively; wherein, the radial variable 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 communicating oil passage 54 communicates with the large displacement oil passage 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 communicating oil passage 54 communicates with the small displacement oil passage 56 so that the first piston 61 pushes the bearing sleeve 46 to reduce the eccentricity of the eccentric crankshaft 5.

[0039] Agricultural machinery requires high torque and low speed during normal operation, while it requires high speed and low torque during transfer. The existing fixed-displacement hydraulic motor requires a large flow rate when outputting high speed, resulting in an increase in the power of the hydraulic motor. The radial variable device of the hydraulic motor realizes 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 not only reduce the flow rate of the hydraulic system but also reduce the power of the engine.

[0040] The first piston 61 and the second piston 62 are respectively located at both ends of the bearing sleeve 46, enabling the bearing sleeve 46 to be uniformly stressed.

[0041] The variable valve hole 442 and the driving cavity 441 are isolated by a variable device.

[0042] The eccentric adjustment hole 461 is a square hole, and the eccentric part 50 is square. The eccentric adjustment hole 461 and the eccentric part 50 enable the bearing sleeve 46 to move along a fixed radial direction, preventing the bearing sleeve 46 from rotating around the axis of the eccentric crankshaft.

[0043] To prevent the first piston 61 and the second piston 62 from freely moving axially and to keep the bearing sleeve 46 in a balanced state, a piston spring 69 is further 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.

[0044] The variable device includes a variable valve core 64 and a variable spring 65. A first oil groove 643 is provided on the variable valve core 64. 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 communication oil path 54, the small displacement oil path 56, and the large displacement oil path 55, so that the communication oil path 54 communicates with the small displacement oil path 56 through the first oil groove 643, or the communication oil path 54 communicates 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. Both 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 both ends of the variable piston ring 647 of the variable valve core 64 for adjusting the position of the variable valve core 64.

[0045] The variable spring 65 can adopt a disc spring, which can make the structure compact.

[0046] Such as Figure 5 and Figure 6As shown, in order to make the variable control more reliable and the machining more convenient, the variable spool 64 includes an outer spool 641 and an inner spool 642; the outer spool 641 is provided with an outer valve hole 646 and a variable piston ring 647, the outer spool 641 is movably arranged in the variable valve hole 442, and the variable piston ring 647 abuts against the variable valve hole 442; the inner spool 642 is rotatably arranged in the outer valve hole 646 through a ball 649 and is movably sleeved on the eccentric crankshaft 5. A first oil groove 643 and a second oil groove 644 are provided on the inner circular surface of the inner spool 642. The first oil groove 643 is arranged opposite to the small displacement oil circuit 56 and the large displacement oil circuit 55 respectively, the second oil groove 644 is 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. The second through hole 645 communicates with the second oil groove 644 and the outer valve hole 646 respectively. Raceways matching the balls 649 are provided on both the outer spool 641 and the inner spool 642. The balls 649 form a rotational connection between the outer spool 641 and the inner spool 642. The inner spool 642 can rotate following the eccentric crankshaft 5, avoiding relative rotation between the inner spool 642 and the eccentric crankshaft 5, while the outer spool 641 does not rotate, improving the sealing performance between the variable piston ring 647 and the variable valve hole 442.

[0047] As Figures 9 to 22 shown, a radial variable hydraulic motor includes a hydraulic motor radial variable device, a high-pressure oil pipe 74 and a shuttle valve 72. Both ends of the high-pressure oil pipe 74 are respectively connected to the eccentric crankshaft 5 and the oil distribution disc 71. The high-pressure oil pipe 74 is used to make the communication oil circuit 54 communicate with the incoming oil circuit through the oil distribution disc 71. The shuttle valve 72 is installed on the oil distribution disc 71 and communicates with the high-pressure oil pipe 74, and is used to control the on-off of the communication oil circuit 54.

[0048] The difference between the radial variable hydraulic motor and the existing radial hydraulic motor lies in the radial variable device. The radial variable hydraulic motor also includes a motor housing 4, a distributor plate 71, and a driving device. 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, and the rear housing 43 is fixed to the other end of the front housing 42. A variable valve hole 442 and a variable oil passage 45 are provided on the front housing 42. A driving cavity 441 is provided on the rear housing 43, and the driving cavity 441 is coaxially arranged with the variable valve hole 442. An oil inlet and an oil outlet are provided on the oil supply seat 41. The distributor plate 71 is rotatably installed in the oil supply seat 41. A plurality of oil distribution oil passages are provided on the distributor plate 71. The oil distribution oil passages include an oil inlet passage communicating with the oil inlet and an oil outlet passage communicating with the oil outlet. The oil port of the shuttle valve communicates with the oil inlet through the oil inlet passage. The distributor plate 71 is connected to the eccentric crankshaft 5 through a double-headed key 75, and the high-pressure oil pipe 74 is located inside the double-headed key 75. The double-headed key 75 is used for transmission, so that the distributor plate 71 rotates synchronously with the eccentric crankshaft 5, thereby realizing the sequential switching of the oil passages. The hydraulic oil sequentially pushes the driving device, and the driving device drives the eccentric crankshaft 5 to rotate continuously through the bearing sleeve 46. Five driving devices are provided in this embodiment. The driving device includes a plunger assembly 49 and a swing cylinder 48. A fourth piston hole 481 and a fourth oil passage 482 communicating with the fourth piston hole 481 are provided on the swing cylinder 48. The swing cylinder 48 is rotatably arranged in the driving cavity 441. The plunger assembly 49 is movably inserted into the fourth piston hole 481 of the swing cylinder 48, and the plunger assembly 49 is movably abutted against the outer circumferential surface of the bearing sleeve 46. The hydraulic oil enters the driving oil passage 73 on the motor housing 4 through the oil inlet passage on the distributor plate 71, and then enters the fourth piston hole 481 in the swing cylinder 48 through the fourth oil passage 482. The hydraulic oil pushes the plunger assembly 49, 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 sequentially push the eccentric bearing sleeve 46, thereby realizing the continuous rotation of the eccentric crankshaft 5.

[0049] One end of the communication oil passage 54 is located at the end of the eccentric crankshaft 5, and the other end of the communication oil passage 54 is located on one side of the eccentric crankshaft 5. The oil inlet of the large displacement oil passage 55 is located on the other side of the eccentric crankshaft 5, and the oil outlet of the large displacement oil passage 55 communicates with the third piston hole 53. The oil inlet of the small displacement oil passage 56 is located on the other side of the eccentric crankshaft 5 and on one side of the oil inlet of the large displacement oil passage 55, and the oil outlet of the small displacement oil passage 56 communicates with the first piston hole 51. In the large displacement state, the oil outlet of the small displacement oil passage 56 communicates with the cavity between the variable spool 64 and the eccentric crankshaft 5 where a variable spring 65 is installed, that is, communicates with the variable valve hole 442, and 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 passage 55 communicates with 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 passage 55 and enters the cavity between the variable spool 64 and the eccentric crankshaft 5.

[0050] The oil inlet and oil outlet of the radial variable hydraulic motor are used to drive the hydraulic motor 5 to rotate.

[0051] The radial variable hydraulic motor is installed on the planetary speed reducer 1. The eccentric crankshaft 5 is connected to the central gear of the planetary speed reducer. The rotary housing 20 of the planetary speed reducer 1 is connected to the wheel hub, and a tire is installed on the wheel hub.

[0052] Large displacement operation state:

[0053] The high-pressure oil introduced from the oil supply port enters the communication oil passage 54 through the shuttle valve 72 and the high-pressure oil pipe 74. The variable oil passage 45 does not admit oil. The variable spool 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 communicates with the communication oil passage 54 and the large displacement oil passage 55 respectively. The hydraulic oil in the communication oil passage 54 enters the large displacement oil passage 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, and then pushes the bearing sleeve 46 to move radially, increasing the eccentricity of the eccentric crankshaft 5, thereby realizing the output of large torque. At this time, the output speed is relatively small. The large displacement state is mainly used to drive the low-speed and high-load walking of agricultural machinery. The hydraulic oil in the first piston hole 51 and the third piston hole 53 enters the cavity between the variable spool 64 and the eccentric crankshaft 5 through the small displacement oil passage 56.

[0054] Small displacement operation state:

[0055] 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 hydraulic motor 5 smaller, and the speed of the planetary reducer can be doubled when the same flow input is used 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.

[0056] The technical principle of the present invention is described above in combination 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 here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the claims of the present invention.

Claims

1. A hydraulic motor radial variable device, characterized in that, Comprising: An eccentric crankshaft (5) rotatably arranged in a drive cavity (441) of a motor housing (4), and provided with a communication oil passage (54), an eccentric portion (50), first piston holes (51) and third piston holes (53) arranged on both sides of the eccentric portion (50), a small displacement oil passage (56) communicating with the first piston holes (51), and a large displacement oil passage (55) communicating with the third piston holes (53); A first piston (61) movably arranged in the first piston holes (51); A third piston (63) movably arranged in the third piston holes (53) and oppositely arranged with the first piston (61); A bearing sleeve (46) provided with an eccentric adjustment hole (461), the eccentric adjustment hole (461) movably sleeved on the eccentric portion (50), and the first piston (61) and the third piston (63) respectively abutted against a first adjustment side surface (462) and a second adjustment side surface (463) of the eccentric adjustment hole (461); and A variable device movably arranged on the eccentric crankshaft (5) and movably located in a variable valve hole (442) of the motor housing (4) for communicating the communication oil passage (54) with the large displacement oil passage (55) to enable the third piston (63) to push the bearing sleeve (46) to increase the eccentricity of the eccentric crankshaft (5) or communicating the communication oil passage (54) with the small displacement oil passage (56) to enable the first piston (61) to push the bearing sleeve (46) to decrease the eccentricity of the eccentric crankshaft (5).

2. A radial variable device for a hydraulic motor according to claim 1, characterized in that, The radial variable device further includes: a second piston (62), the second piston (62) movably arranged in a second piston hole (52) of the eccentric portion (50) and abutted against the first adjustment side surface (462), and the second piston hole (52) communicates with the small displacement oil passage (56).

3. A radial variable device for a hydraulic motor according to claim 1, characterized in that, The radial variable device further includes: a piston spring (69), the piston spring (69) arranged between the first piston (61) and the eccentric portion (50).

4. A radial variable device for a hydraulic motor according to claim 1, characterized in that The variable device includes: A variable valve core (64), the variable valve core (64) movably sleeved on one end of the eccentric crankshaft (5), and an annular first oil groove (643) provided on the variable valve core (64); and A variable spring (65), the variable spring (65) movably sleeved on the eccentric crankshaft (5) and connected to the eccentric crankshaft (5) and the variable valve core (64) at both ends respectively; Wherein, the variable valve core (64) is used to communicate the communication oil passage (54) with the large displacement oil passage (55) or the small displacement oil passage (56) respectively through the variable oil passage (45) on the variable valve hole (442) and the variable spring (65) through the first oil groove (643).

5. A radial variable device of a hydraulic motor according to claim 4, characterized in that, The variable valve core (64) includes: An outer valve core (641), the outer valve core (641) is provided with an outer valve hole (646) and a variable piston ring (647), and the variable piston ring (647) is movably arranged in the variable valve hole (442); and An inner spool (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 spool (642).

6. A radial variable hydraulic motor, characterized in that, Comprising: A hydraulic motor radial variable device according to any one of claims 1 to 5; And A high-pressure oil pipe (74) having two ends respectively connected to the eccentric crankshaft (5) and the oil distribution plate (71), and the high-pressure oil pipe (74) is configured to communicate the communication oil path (54) with the inlet oil path through the oil distribution plate (71).

7. A radial variable hydraulic motor according to claim 6, characterized in that, The radial variable hydraulic motor further includes a shuttle valve (72) disposed on the oil distribution plate (71) and communicating with the high-pressure oil pipe (74).

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