A hydraulic motor

Abstract

The utility model provides a kind of hydraulic motor, including shell, front cover, back cover, rolling bearing A, arc baffle, internal gear and rotor gear shaft;The shell is provided with round hole, and one positioning stop is respectively arranged at the front and rear ends of round hole, and rolling bearing A is arranged in the two positioning stops, and internal gear is further arranged in round hole, and internal gear is supported by rolling bearing A, and rotor gear shaft is arranged in internal gear, and internal gear and rotor gear shaft are engaged, and the arc baffle is installed in the cavity chamber formed between internal gear and rotor gear shaft, and the arc baffle separates the cavity chamber into left oil chamber and right oil chamber;The front end of shell is provided with front cover, and the rear end of shell is provided with back cover, and the front and rear ends of rotor gear shaft are rotatably supported by front cover and back cover respectively.The friction degree of internal gear and the inner wall of round hole can be significantly reduced, the torque required for starting hydraulic motor is reduced, the torque output is enhanced, and the wear of the contact part of internal gear and the inner wall of round hole is reduced.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic components technology, and in particular to a hydraulic motor. Background Technology

[0002] An internally meshing hydraulic motor is essentially a positive displacement hydraulic machine, which is the reverse operation of an internally meshing gear pump. Its basic principle is to use the pressure energy of hydraulic oil to drive a pair of internally meshing gears (an internal gear ring and an external gear) to produce relative motion, thereby converting hydraulic energy into rotational mechanical energy (torque and speed).

[0003] The main structure includes • Internal Gear: Rotatable and mounted in the housing.

[0004] • External Gear / Rotor: With an output shaft, it meshes with the internal teeth of the internal gear ring and rotates in the same direction as the internal gear ring but at a different speed.

[0005] • Crescent Seal: A crescent-shaped baffle fixed to the housing and inserted between the internal and external gears. Its function is to always separate the high-pressure area (oil inlet) from the low-pressure area (oil return) to prevent oil short circuit.

[0006] • Housing: Contains all components and has an oil inlet and outlet.

[0007] Detailed Explanation of Working Principle The working principle is based on volume change and gear meshing, and the process is as follows: Step 1: Forming a variable working cavity The internal gear ring and external gear are eccentrically mounted, with a crescent-shaped plate filling the gap between them. Thus, on either side of the crescent-shaped plate, the tooth grooves of the internal gear ring, the tooth tips of the external gear, and the crescent-shaped plate and end cap together form two independent sealed cavity areas. • Left side region: On one side of the crescent plate, the cavity gradually increases in size (expansion cavity).

[0008] • Right side region: On the other side of the crescent plate, the cavity decreases in size (compression cavity).

[0009] Step 2: High-pressure oil injection and operation • High-pressure oil enters through the inlet and is directed into the expansion chamber on the left (i.e., the area where the volume is increasing).

[0010] High-pressure oil acts simultaneously on the tooth surfaces of both the internal gear ring and the external gear. The oil pressure attempts to "push" the two gears apart, but because they are locked together at the meshing point, this force is converted into a torque that drives both gears to rotate simultaneously.

[0011] Step 3: Gear Motion and Output • Because the internal gear ring has one or more teeth than the external gear, when high-pressure oil drives them to rotate, the speed of the external gear will be higher than that of the internal gear ring.

[0012] Both rotate in the same direction.

[0013] • Dual output: Power can be output separately from the external gear shaft, separately from the internal gear ring shaft, or even simultaneously from both ends to drive two loads. This provides a compact solution for certain special mechanisms (such as winches, dual drive wheels).

[0014] Step 4: Low-pressure oil discharge and continuous operation As the gears rotate, the chamber that has completed its work is carried into the compression chamber on the right (i.e., the area where the volume is decreasing).

[0015] • This area is connected to the low-pressure return port through the isolation of the crescent plate.

[0016] The continued rotation of the gears forces the low-pressure oil out of these smaller cavities and back into the tank.

[0017] The key function of the crescent plate: It acts like a fixed "wall" to ensure that the expansion chamber is always connected to the high-pressure oil circuit and the compression chamber is always connected to the low-pressure oil circuit throughout the entire rotation of the gear, thereby achieving continuous and stable torque output.

[0018] The main disadvantages of existing internal meshing motors are: 1. The internal gear ring and the housing are in a sliding support form, which has a large frictional torque, the inner wall of the housing is prone to wear, the motor has high starting resistance, and the motor is prone to creeping.

[0019] 2. Motor direction and pressure control also require external valve control, which is quite troublesome for machines that need to be moved frequently; 3. The end caps on both sides of the housing are usually made of softer materials. Their inner surfaces are prone to friction with the inner gear ring and the outer end face of the external gear, which can lead to wear, corrosion and scratches on the inner wall of the end cap, resulting in internal oil leakage, heat generation and reduced volumetric efficiency. Utility Model Content

[0020] The purpose of this utility model is to provide a hydraulic motor in which the internal gear rotates in the circular hole of the housing supported by the rolling bearing A. This can significantly reduce the friction between the internal gear and the inner wall of the circular hole, reduce the torque required for the hydraulic motor to start, enhance the torque output, reduce the wear of the contact parts between the internal gear and the inner wall of the circular hole, improve the overall life of the hydraulic motor, and at the same time prevent the hydraulic motor from exhibiting a creeping phenomenon.

[0021] This application provides a hydraulic motor, including a housing, a front cover plate, a rear cover plate, a rolling bearing A, an arc-shaped partition, an internal gear, and a rotor gear shaft; the housing is provided with a circular hole, and each end of the circular hole is provided with a positioning stop, and the rolling bearing A is provided in each of the two positioning stops; the circular hole is also provided with an internal gear, which is supported by the rolling bearing A; the internal gear is provided with a rotor gear shaft, and the internal gear and the rotor gear shaft mesh; the arc-shaped partition is installed in the cavity formed between the internal gear and the rotor gear shaft, and the arc-shaped partition divides the cavity into a left oil chamber and a right oil chamber; The front end of the housing is provided with a front cover plate, and the rear end of the housing is provided with a rear cover plate. The front and rear ends of the rotor gear shaft are rotatably supported by the front cover plate and the rear cover plate, respectively.

[0022] Preferably, the front cover plate is provided with a stop A, a bearing hole A and a partition slot A. The front cover plate is engaged with the outer ring of the rolling bearing A at the front end of the housing through the stop A. A rolling bearing C is installed in the bearing hole A. The front end of the rotor gear shaft is inserted into the rolling bearing C. The front end of the arc-shaped partition is inserted into the partition slot A.

[0023] Preferably, the rear cover plate is provided with a stop B, a bearing hole B, and a partition slot B. The rear cover plate is engaged with the outer ring of the rolling bearing A at the rear end of the housing through the stop B. The rolling bearing B is installed in the bearing hole B. The rear end of the rotor gear shaft is installed in the rolling bearing B. The rear end of the arc-shaped partition is inserted into the partition slot B.

[0024] Preferably, the inner sides of the front cover plate and the rear cover plate are respectively provided with a front insert hole and a rear insert hole, and inserts are provided in the front insert hole and the rear insert hole.

[0025] Preferably, the inner wall of the circular hole of the housing is provided with a left arc-shaped groove and a right arc-shaped groove, and the rear cover plate is provided with an internal oil passage. The internal oil passage is connected to a reversing valve A. The two oil outlets A1 and B1 of the reversing valve A are respectively connected to the left arc-shaped groove and the right arc-shaped groove. The left arc-shaped groove and the right arc-shaped groove are respectively connected to the left oil chamber and the right oil chamber. The forward and reverse rotation of the hydraulic motor is controlled by the reversing valve A.

[0026] Preferably, the internal oil circuit is also connected to a throttle valve A and a hydraulic pressure gauge. The oil inlet P1 of the directional valve A is connected to an external hydraulic source P, and is also connected to a hydraulic pressure gauge and a relief valve. The relief valve is used to adjust the pressure of the oil inlet P and is displayed by the hydraulic pressure gauge. The throttle valve A is located between the oil outlet A1 and the left oil chamber and is used to adjust the oil outlet speed of the oil outlet A1.

[0027] Preferably, the internal oil circuit is also connected to a reversing valve B, a relief valve B, and a hydraulic check valve. The oil inlet P2 of the reversing valve B is connected to the oil return port T1 of the reversing valve A and the relief valve B. The relief valve B is used to adjust the pressure of the oil inlet P2. The oil outlet A2 and oil outlet B2 of the reversing valve B are connected to an external oil cylinder.

[0028] Preferably, the internal gear has an oil passage hole along its outer circumference, and the oil passage hole communicates with the tooth groove of the internal gear. Because this utility model adopts the above-described technical solution, it has the following advantages: 1. The internal gear is supported by rolling bearing A to rotate in the circular hole of the housing, which can significantly reduce the friction between the outer surface of the internal gear and the inner wall of the circular hole, reduce the torque required for the hydraulic motor to start, enhance torque output, reduce wear at the contact points between the internal gear and the inner wall of the circular hole, improve the overall life of the hydraulic motor, and at the same time prevent the hydraulic motor from creeping. This makes the speed and pressure resistance of this invention higher, the operation more stable, the noise lower, and the oil leakage less.

[0029] 2. By placing the internal oil circuit in the rear cover plate, this utility model achieves a higher degree of integration, smaller size, and lighter weight. It can also control the extension and retraction of the external oil cylinder. Throttle valve A can be set to adjust the speed of the rotor gear shaft; directional valve A can be set to easily adjust the rotation direction of the rotor gear shaft; by adjusting the pressure of overflow valve A, the output torque of the rotor gear shaft can be controlled and can be read and calculated by a hydraulic pressure gauge.

[0030] 3. The inserts are embedded on the inner surfaces of the front and rear cover plates. Due to their high hardness and exceptional wear resistance, the inserts prevent the outer end faces of the internal gear and rotor gear shaft from wearing on the base of the front and rear cover plates. The inner walls of the front and rear cover plates are not easily worn, corroded, or scratched, and there will be no internal oil leakage, overheating, or reduced volumetric efficiency. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of the hydraulic motor of this utility model.

[0032] Figure 2 This is a schematic diagram of the rear cover structure of this utility model.

[0033] Figure 3 This is a schematic diagram of the arc-shaped partition structure of this utility model.

[0034] Figure 4 This is a schematic diagram of the installation of the partition slot A structure of this utility model.

[0035] Figure 5 This is a schematic diagram of the rear insert hole structure of this utility model.

[0036] Figure 6 This is a schematic diagram of the internal gear structure of this utility model.

[0037] Figure 7 This is a schematic diagram of the bearing hole A structure of this utility model.

[0038] Figure 8This is a schematic diagram of the left arc-shaped groove structure of this utility model.

[0039] Figure 9 This is a schematic diagram of the right arc-shaped groove structure of this utility model.

[0040] Figure 10 This is a schematic diagram of the left oil chamber structure of this utility model.

[0041] Figure 11 This is a schematic diagram of the hydraulic pressure gauge structure of this utility model.

[0042] Figure 12 This is a schematic diagram of the hydraulic principle of the hydraulic motor of this utility model.

[0043] Icon labels: 1-Housing; 2-Front cover plate; 3-Rear cover plate; 4-Rotor gear shaft; 5-Reversing valve A; 6-Throttle valve A; 7-Relief valve A; 8-Hydraulic pressure gauge; 9-Reversing valve B; 10-Keyway; 11-Arc-shaped partition; 12-Rolling bearing A; 13-Internal gear; 14-Insert; 15-Rolling bearing B; 16-Rolling bearing C; 17-Left oil chamber; 18-Right oil chamber; 19-Hydraulic... Pressure source; 20-Relief valve B; 201-Stop A; 202-Bearing hole A; 203-Baffle slot A; 204-Front insert hole; 21-Hydraulic check valve; 22-External cylinder; 101-Positioning stop; 102-Left arc groove; 103-Right arc groove; 301-Stop B; 302-Bearing hole B; 303-Baffle slot B; 304-Rear insert hole; 1301-Oil passage hole. Detailed Implementation

[0044] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0045] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0046] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up" and "connected" should be interpreted broadly. For example, they can refer to fixed connection, detachable connection, or integral connection; they can refer to mechanical connection or electrical connection; they can refer to direct connection or indirect connection through an intermediate medium; and they can refer to the connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0047] See Figure 1-12 This application provides a hydraulic motor, including a housing 1, a front cover plate 2, a rear cover plate 3, a rolling bearing A12, an arc-shaped partition 11, an internal gear 13, and a rotor gear shaft 4; the housing 1 is provided with a circular hole, and each of the front and rear ends of the circular hole is provided with a positioning stop 101, and a rolling bearing A12 is provided in each of the two positioning stops 101. The internal gear 13 is also provided in the circular hole and is supported by the rolling bearing A12. The rotor gear shaft 4 is provided in the internal gear 13, and the internal gear 13 and the rotor gear shaft 4 mesh. The arc-shaped partition 11 is installed in the cavity formed between the internal gear 13 and the rotor gear shaft 4, and the arc-shaped partition 11 divides the cavity into a left oil chamber 17 and a right oil chamber 18. The housing 1 has a front cover plate 2 at its front end and a rear cover plate 3 at its rear end. The rotor gear shaft 4 is rotatably supported at its front and rear ends by the front cover plate 2 and the rear cover plate 3, respectively. The internal gear 13 is supported by the rolling bearing A12 to rotate in the circular hole of the housing 1, which can significantly reduce the friction between the internal gear 13 and the inner wall of the circular hole, reduce the torque required for the hydraulic motor to start, enhance the torque output, reduce the wear of the contact parts between the internal gear 13 and the inner wall of the circular hole, improve the overall life of the hydraulic motor, and prevent the hydraulic motor from creeping.

[0048] In another embodiment of this invention, the front cover plate 2 is provided with a stop A201, a bearing hole A202 and a partition slot A203. The front cover plate 2 is engaged with the outer ring of the rolling bearing A12 at the front end of the housing 1 through the stop A201. The rolling bearing C16 is installed in the bearing hole A202. The front end of the rotor gear shaft 4 is inserted into the rolling bearing C16. The front end of the arc-shaped partition 11 is inserted into the partition slot A203.

[0049] In another embodiment of this invention, the rear cover plate 3 is provided with a stop B301, a bearing hole B302 and a partition slot B303. The rear cover plate 3 is engaged with the outer ring of the rolling bearing A12 at the rear end of the housing 1 through the stop B301. The rolling bearing B15 is installed in the bearing hole B302. The rear end of the rotor gear shaft 4 is installed in the rolling bearing B15. The rear end of the arc-shaped partition 11 is inserted into the partition slot B303.

[0050] In another embodiment, the inner surfaces of the front cover plate 2 and the rear cover plate 3 are respectively provided with a front insert hole 204 and a rear insert hole 304, and inserts 14 are provided in the front insert hole 204 and the rear insert hole 304. Preferably, the insert 14 is made of wear-resistant high-hardness bearing steel, and its main function is to prevent the two outer end faces of the internal gear 13 and the rotor gear shaft 4 from excessively rubbing against the inner surfaces of the front cover plate 2 and the rear cover plate 3, so as to prevent premature wear of the parts of the front cover plate 2 and the rear cover plate 3 that are in contact with the internal gear 13 and the rotor gear shaft 4.

[0051] In another embodiment, the inner wall of the circular hole of the housing 1 is provided with a left arc-shaped groove 102 and a right arc-shaped groove 103. The rear cover plate 3 is provided with an internal oil passage, which is connected to a reversing valve A5. The two oil outlets A1 and B1 of the reversing valve A5 are respectively connected to the left arc-shaped groove 102 and the right arc-shaped groove 103. The left arc-shaped groove 102 and the right arc-shaped groove 103 are respectively connected to the left oil chamber 17 and the right oil chamber 18. The reversing valve A5 controls the forward and reverse rotation of the hydraulic motor. The specific process is as follows: when the reversing valve A5 controls the oil to enter the left arc-shaped groove 102, the hydraulic oil will enter the left oil chamber 17 from the left arc-shaped groove 102. The hydraulic oil pushes the internal gear 13 and the rotor gear shaft 4 to rotate clockwise (from the perspective of the view). Figure 9 (Observation); When the directional valve A5 controls the hydraulic fluid to enter the right arc-shaped groove 103, the hydraulic oil will enter the right oil chamber 18 from the right arc-shaped groove 103. The hydraulic oil will drive the internal gear 13 and the rotor gear shaft 4 to rotate counterclockwise (from the perspective of the view). Figure 9 observe).

[0052] In another embodiment of this invention, the internal oil circuit is further connected to a throttle valve A6 and a hydraulic pressure gauge 8. The oil inlet P1 of the directional valve A5 is connected to an external hydraulic source P, and is also connected to the hydraulic pressure gauge 8 and a relief valve A7. The relief valve A7 is used to adjust the pressure of the oil inlet P1 and is displayed by the hydraulic pressure gauge 8. The throttle valve A6 is located between the oil outlet A1 and the left oil chamber 17 and is used to adjust the oil outlet speed of the oil outlet A1.

[0053] In another embodiment of this invention, the internal oil circuit is further connected to a directional valve B9, a relief valve B20, and a hydraulically controlled check valve 21. The inlet P2 of the directional valve B9 is connected to the return port T1 of the directional valve A5 and the relief valve B20. The relief valve B20 is used to regulate the pressure at the inlet P2. The outlets A2 and B2 of the directional valve B9 are connected to an external hydraulic cylinder. The directional valve B9 is used to control the extension and retraction of the piston rod of the external hydraulic cylinder. Specifically, the outlets A2 and B2 of the directional valve B9 are connected to the external hydraulic cylinder through the hydraulically controlled check valve 21, which prevents the piston rod from automatically retracting after being subjected to external force.

[0054] In another embodiment of this invention, the internal gear 13 is provided with an oil passage hole 1301 along its outer circumference, and the oil passage hole 1301 communicates with the tooth groove of the internal gear 13. The advantage of this is that the oil can more easily enter the tooth groove of the internal gear 13 from the oil passage hole 1301, and then enter the left oil chamber 17 or the right oil chamber 18, thereby driving the internal gear 13 and the rotor gear shaft 4 to rotate.

[0055] Specific working principle: Pressure oil is supplied to the oil inlet P1 of directional valve A5 by an external hydraulic source P19. Directional valves A5 and B9 can be three-position four-way manual directional valves or three-position four-way solenoid directional valves. When the valve core of directional valve A5 is in the neutral position, the oil enters from port P1 to port T1, and then to port P2. If directional valve B9 is in the neutral position at this time, the oil returns directly to the oil tank through port T2. If directional valve B9 is switched to the left position, it can control the external cylinder 22 to extend the piston rod. If directional valve B9 is switched to the right position, it can control the external cylinder 22 to retract the piston rod. When the directional valve A5 spool is in the left position, hydraulic oil enters the left arc-shaped groove 102 from the outlet A1 via the throttle valve A6. Then, hydraulic oil enters the left oil chamber 17 from the left arc-shaped groove 102, increasing the oil pressure in the left oil chamber 17, which in turn drives the internal gear 13 and the rotor gear shaft 4 to rotate clockwise (from the perspective of...). Figure 9 (Observation) After the work is done, the oil enters the right oil chamber 18, passes through the right arc groove 103 and enters the oil outlet B1, and finally enters the P2 outlet from the T1 outlet. When the directional valve A5 spool is in the right position, hydraulic oil enters the right arc-shaped groove 103 from the outlet B1. Then, hydraulic oil enters the right oil chamber 18 from the right arc-shaped groove 103, increasing the oil pressure in the right oil chamber 18. This, in turn, drives the internal gear 13 and the rotor gear shaft 4 to rotate counterclockwise (from the perspective of...). Figure 9 (Observation) After the work is done, the oil enters the left oil chamber 17 through the throttle valve A6, then enters the oil outlet A1 through the left arc groove 102, and finally enters the P2 port from the T1 port.

[0056] The advantages of this utility model are: 1. The internal gear 13 is supported by the rolling bearing A12 to rotate in the circular hole of the housing 1, which can significantly reduce the friction between the outer surface of the internal gear 13 and the inner wall of the circular hole, reduce the torque required for the hydraulic motor to start, enhance the torque output, reduce the wear of the contact parts between the internal gear 13 and the inner wall of the circular hole, improve the overall life of the hydraulic motor, and at the same time, the hydraulic motor will not exhibit creeping phenomenon, making the speed and pressure resistance of this utility model higher, the operation more stable, the noise lower, and the oil leakage less.

[0057] 2. By placing the internal oil circuit in the rear cover plate 3, the present invention achieves a higher degree of integration, smaller size, and lighter weight. It can also control the extension and retraction of the external oil cylinder 22. The throttle valve A6 can adjust the speed of the rotor gear shaft 4; the reversing valve A5 can conveniently adjust the rotation direction of the rotor gear shaft 4; and the output torque of the rotor gear shaft 4 can be controlled by adjusting the pressure of the overflow valve A7, which can be read and calculated by the hydraulic pressure gauge 8.

[0058] 3. The insert 14 is embedded on the inner side of the front cover plate 2 and the rear cover plate 3. Since the insert 14 has the characteristics of high hardness and exceptional wear resistance, it can prevent the outer end face of the internal gear 13 and the rotor gear shaft 4 from causing wear on the base of the front cover plate 2 and the rear cover plate 3. The inner wall of the front cover plate 2 and the rear cover plate 3 is not easily worn, corroded, or scratched, and there will be no internal oil leakage, heat generation, or reduction in volumetric efficiency.

[0059] In summary, it is readily understood by those skilled in the art that, without conflict, the aforementioned advantageous methods can be freely combined and superimposed.

[0060] The above description is merely an embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A hydraulic motor, characterized in that: The device includes a housing (1), a front cover plate (2), a rear cover plate (3), a rolling bearing A (12), an arc-shaped partition plate (11), an internal gear (13), and a rotor gear shaft (4). The housing (1) has a circular hole, and each end of the circular hole has a positioning stop (101). The two positioning stops (101) are equipped with rolling bearings A (12). The circular hole is also equipped with an internal gear (13), which is supported by the rolling bearings A (12). The internal gear (13) is equipped with a rotor gear shaft (4), and the internal gear (13) and the rotor gear shaft (4) mesh. The arc-shaped partition plate (11) is installed in the cavity formed between the internal gear (13) and the rotor gear shaft (4). The arc-shaped partition plate (11) divides the cavity into a left oil chamber (17) and a right oil chamber (18). The front end of the housing (1) is provided with a front cover plate (2), and the rear end of the housing (1) is provided with a rear cover plate (3). The front and rear ends of the rotor gear shaft (4) are rotatably supported by the front cover plate (2) and the rear cover plate (3) respectively.

2. The hydraulic motor according to claim 1, characterized in that: The front cover plate (2) is provided with a stop A (201), a bearing hole A (202) and a partition slot A (203). The front cover plate (2) is engaged with the outer ring of the rolling bearing A (12) at the front end of the housing (1) through the stop A (201). The rolling bearing C (16) is installed in the bearing hole A (202). The front end of the rotor gear shaft (4) is inserted into the rolling bearing C (16), and the front end of the arc-shaped partition (11) is inserted into the partition slot A (203).

3. The hydraulic motor according to claim 1, characterized in that: The rear cover plate (3) is provided with a stop B (301), a bearing hole B (302) and a partition slot B (303). The rear cover plate (3) is engaged with the outer ring of the rolling bearing A (12) at the rear end of the housing (1) through the stop B (301). The rolling bearing B (15) is installed in the bearing hole B (302). The rear end of the rotor gear shaft (4) is installed in the rolling bearing B (15). The rear end of the arc-shaped partition (11) is inserted into the partition slot B (303).

4. The hydraulic motor according to claim 1, characterized in that: The inner sides of the front cover plate (2) and the rear cover plate (3) are respectively provided with a front insert hole (204) and a rear insert hole (304), and inserts (14) are provided in the front insert hole (204) and the rear insert hole (304).

5. The hydraulic motor according to claim 1, characterized in that: The inner wall of the round hole of the housing (1) is provided with a left arc groove (102) and a right arc groove (103). The rear cover plate (3) is provided with an internal oil passage. The internal oil passage is connected to a reversing valve A (5). The two oil outlets A1 and B1 of the reversing valve A (5) are respectively connected to the left arc groove (102) and the right arc groove (103). The left arc groove (102) and the right arc groove (103) are respectively connected to the left oil chamber (17) and the right oil chamber (18). The forward and reverse rotation of the hydraulic motor is controlled by the reversing valve A (5).

6. The hydraulic motor according to claim 5, characterized in that: The internal oil circuit is also connected to a throttle valve A (6) and a hydraulic pressure gauge (8). The oil inlet P1 of the reversing valve A (5) is connected to an external hydraulic source P, and is also connected to the hydraulic pressure gauge (8) and the relief valve A (7). The relief valve A (7) is used to adjust the pressure of the oil inlet P1 and is displayed by the hydraulic pressure gauge (8). The throttle valve A (6) is located between the oil outlet A1 and the left oil chamber (17) and is used to adjust the oil outlet speed of the oil outlet A1.

7. The hydraulic motor according to claim 5, characterized in that: The internal oil circuit is also connected to a reversing valve B (9), an overflow valve B (20), and a hydraulic check valve (21). The oil inlet P2 of the reversing valve B (9) is connected to the oil return port T1 of the reversing valve A (5) and the overflow valve B (20). The overflow valve B (20) is used to adjust the pressure of the oil inlet P2. The oil outlet A2 and oil outlet B2 of the reversing valve B (9) are connected to the external oil cylinder.

8. The hydraulic motor according to claim 1, characterized in that: An oil passage hole (1301) is provided on the outer surface of the internal gear (13) along the circumference, and the oil passage hole (1301) communicates with the tooth groove of the internal gear (13).

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