Hydraulic motor

Abstract

A kind of hydraulic motor, including shell and back cover, the back cover is arranged in shell one side and is connected with shell, the inner cavity is formed in the shell, transmission shaft is arranged on the shell, one end of the transmission shaft passes through the inner cavity and is connected with the back cover, the part of the transmission shaft in the inner cavity is set with cylinder and oil distribution plate, cylinder spring is arranged in the cylinder, by setting cylinder spring, so that cylinder can be always tightly and stably pressed on oil distribution plate under the elastic force of cylinder spring.This tight pressing state ensures that the hydraulic motor can keep good sealing and cooperation precision between cylinder and oil distribution plate during working process, effectively prevents the leakage of hydraulic oil, improves the working efficiency and reliability of hydraulic motor.At the same time, the accurate setting of spring limiting assembly further guarantees the stability of the position of cylinder spring, avoids the performance fluctuation caused by spring displacement, provides strong guarantee for the stable operation of hydraulic motor.

Description

Technical Field

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

[0002] In existing technologies, the separation of the cylinder body and the distributor plate due to separation forces during the operation of hydraulic motors has always been a key factor affecting the stable operation and service life of hydraulic motors. During operation, changes in internal hydraulic oil pressure and the rotation of the drive shaft generate significant separation forces. If these forces are not effectively controlled, separation will occur between the cylinder body and the distributor plate. Once the cylinder body and distributor plate separate, the leakage of hydraulic oil increases dramatically, leading not only to a significant decrease in the working efficiency of the hydraulic motor but also to unstable hydraulic system pressure, affecting the normal operation of the entire equipment. Summary of the Invention

[0003] In view of this, the present invention provides a hydraulic motor.

[0004] To achieve the above objectives, this utility model provides the following technical solution: A hydraulic motor includes a housing and a rear cover. The rear cover is disposed on one side of the housing and connected to the housing. An inner cavity is formed inside the housing. A drive shaft is disposed on the housing. One end of the drive shaft passes through the inner cavity and is connected to the rear cover. A cylinder and a distribution plate are sleeved on the portion of the drive shaft located in the inner cavity. A cylinder spring is disposed in the cylinder. A spring groove is formed between the cylinder and the drive shaft. The cylinder spring is sleeved on the portion of the drive shaft located in the spring groove. A spring limiting assembly is disposed on the drive shaft. The spring limiting assembly limits the position of the cylinder spring on the drive shaft. The cylinder is pressed against the distribution plate under the action of the cylinder spring.

[0005] Preferably, the spring limiting assembly includes two cylinder gaskets disposed at the two ends of the drive shaft and an elastic retaining ring for a first hole disposed on the side of the drive shaft near the rear cover. The elastic retaining ring for the first hole is connected to the cylinder gaskets near the rear cover, and the cylinder spring is disposed between the two cylinder gaskets.

[0006] Preferably, a drive shaft positioning assembly is provided on the drive shaft, the housing has a drive shaft inlet, and the drive shaft positioning assembly includes a front positioning assembly disposed between the drive shaft and the inner wall of the drive shaft inlet and a rear positioning assembly disposed between the drive shaft and the rear cover. The drive shaft has a front positioning part and a rear positioning part, and the front positioning assembly and the rear positioning assembly are respectively sleeved on the front positioning part and the rear positioning part.

[0007] Preferably, the front positioning assembly includes a cylindrical roller bearing, a shaft seal seat, a bearing retaining ring, a second hole elastic retaining ring, a shaft elastic retaining ring, and an oil seal. The cylindrical roller bearing and the shaft seal seat are both sleeved between the front positioning portion and the inner wall of the drive shaft extension inlet. An oil seal annular groove is formed between the shaft seal seat and the front positioning portion. The oil seal is disposed within the oil seal annular groove. A limiting annular groove is formed by an inward recess on the inner wall of the drive shaft extension inlet. The second hole elastic retaining ring is disposed within the limiting annular groove. One side of the second hole elastic retaining ring extends out of the limiting annular groove and connects with the shaft seal seat, limiting the axial position of the shaft seal seat on the front positioning portion. The shaft elastic retaining ring is disposed on the side of the front positioning portion near the shaft seal seat where the cylindrical roller bearing is located. The shaft elastic retaining ring limits the axial position of the cylindrical roller bearing on the front positioning portion.

[0008] Preferably, the rear positioning assembly includes a needle roller bearing and a wire retaining ring for the shaft. The needle roller bearing is sleeved between the rear positioning part and the rear cover. The wire retaining ring for the shaft is located on the side of the rear positioning part near the rear cover where the needle roller bearing is located. The wire retaining ring for the shaft limits the axial position of the needle roller bearing on the rear positioning part.

[0009] Preferably, a plunger is provided on the cylinder body, and a slipper assembly is provided between the plunger and the inner wall of the cavity. The slipper assembly includes a slipper body, a return plate, and a friction plate. The slipper body is disposed between the return plate and the friction plate. The return plate is disposed on the side of the slipper body closer to the plunger. One end of the plunger is connected to the cylinder body, and the other end of the plunger abuts against the return plate. The friction plate is disposed on the side of the slipper away from the return plate and is in contact with the inner wall of the cavity.

[0010] Preferably, the inner wall of the inner cavity that connects with the friction disc is inclined at an angle of 17°.

[0011] The beneficial effects of this invention are as follows: by setting a cylinder spring, the cylinder body can always be tightly and stably pressed against the distributor plate under the elastic force of the cylinder spring. Under a certain back pressure, the reasonable distribution of the cylinder spring force and the ball joint spring force ensures that the ball joint spring force allows the slipper to fit well against the friction plate, and also compensates for the insufficient force of the ball joint spring alone by setting the cylinder spring, thereby ensuring sufficient total spring force to keep the cylinder body tightly and stably pressed against the distributor plate. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Appendix Figure 1 This is a schematic diagram of the structure of this utility model; Appendix Figure 2 For the appendix Figure 1 Enlarged view of point A in the middle; Appendix Figure 3 For the appendix Figure 1 Enlarged view of section B in the middle. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] The present invention will now be further described with reference to the accompanying drawings.

[0016] This utility model provides the following technical solution: As attached Figure 1-3 As shown, this utility model discloses a hydraulic motor, including a housing 1 and a rear cover 2. The rear cover 2 is disposed on one side of the housing 1 and connected to the housing 1. An inner cavity 3 is formed inside the housing 1. A drive shaft 4 is disposed on the housing 1. One end of the drive shaft 4 passes through the inner cavity 3 and is connected to the rear cover 2. A cylinder body 5 and a distribution plate 6 are sleeved on the portion of the drive shaft 4 located in the inner cavity 3. A cylinder body spring 7 is disposed inside the cylinder body 5. A spring groove 8 is formed between the cylinder body 5 and the drive shaft 4. The cylinder body spring 7 is sleeved on the portion of the drive shaft 4 located in the spring groove 8. A spring limiting component 9 is disposed on the drive shaft 4. The spring limiting component 9 limits the position of the cylinder body spring 7 on the drive shaft 4. The cylinder body 5 is pressed against the distribution plate 6 under the action of the cylinder body spring 7. Specifically, in this design, by setting the cylinder body spring 7, the cylinder body 5 can always be tightly and stably pressed against the distribution plate 6 under the action of the elastic force of the cylinder body spring 7. This tight clamping condition ensures that the cylinder body 5 and the distributor plate 6 maintain good sealing and fitting precision during operation, effectively preventing hydraulic oil leakage and improving the working efficiency and reliability of the hydraulic motor. At the same time, the precise setting of the spring limit assembly 9 further ensures the stability of the cylinder spring 7 position, avoiding performance fluctuations caused by spring displacement, and providing strong support for the stable operation of the hydraulic motor.

[0017] Furthermore, the spring limiting assembly 9 includes two cylinder gaskets 10 disposed on the drive shaft 4 at both ends of the spring, and a first-hole elastic retaining ring 11 disposed on the side of the drive shaft 4 near the rear cover 2. The first-hole elastic retaining ring 11 is connected to the cylinder gaskets 10 near the rear cover 2, and the cylinder spring 7 is disposed between the two cylinder gaskets 10. Specifically, in this embodiment, the spring limiting assembly 9 adopts a structure in which the two cylinder gaskets 10 are respectively disposed on the drive shaft 4 at both ends of the spring, which can effectively limit the spring from both ends and prevent the spring from axially moving on the drive shaft 4. The first-hole elastic retaining ring 11 disposed on the side of the drive shaft 4 near the rear cover 2 is connected to the cylinder gaskets 10 near the rear cover 2, which further enhances the limiting effect and firmly restricts the cylinder spring 7 between the two cylinder gaskets 10. In addition, the spring force of the cylinder spring 7 can resist the hydraulic pressure inside the outer casing 1, better pressing the cylinder 5 onto the oil distribution plate 6. The spring force of the cylinder spring 7 can resist part of the separation force transmitted from the drive shaft 4. This design is not only simple in structure and easy to assemble, but also reliably ensures the stability of the position of the cylinder spring 7 during operation, thereby ensuring that the cylinder 5 is always tightly and stably pressed against the oil distribution plate 6, maintaining good sealing and fitting accuracy of the hydraulic motor, and ensuring stable and efficient operation of the hydraulic motor.

[0018] Furthermore, a drive shaft positioning assembly 12 is provided on the drive shaft 4, and the outer casing 1 has a drive shaft insertion port 13. The drive shaft positioning assembly 12 includes a front positioning assembly 14 disposed between the drive shaft 4 and the inner wall of the drive shaft insertion port 13, and a rear positioning assembly 15 disposed between the drive shaft 4 and the rear cover 2. The drive shaft 4 has a front positioning part 16 and a rear positioning part 17, and the front positioning assembly 14 and the rear positioning assembly 15 are respectively sleeved on the front positioning part 16 and the rear positioning part 17. Specifically, in this embodiment, the front positioning assembly 14 is disposed between the drive shaft 4 and the inner wall of the drive shaft insertion port 13, which can effectively position the front end of the drive shaft 4, preventing it from generating excessive radial runout during operation and ensuring the rotational accuracy of the drive shaft 4. The rear positioning assembly 15 is disposed between the drive shaft 4 and the rear cover 2, which positions the rear end of the drive shaft 4, cooperating with the front positioning assembly 14 to jointly ensure the stability of the drive shaft 4 along its entire length. The front positioning part 16 and the rear positioning part 17 on the drive shaft 4 provide accurate mounting positions for the front positioning assembly 14 and the rear positioning assembly 15, enabling the positioning assemblies to perform their functions better. This design of the drive shaft positioning assembly 12 further improves the overall performance of the hydraulic motor and reduces vibration and noise caused by the instability of the drive shaft 4.

[0019] Furthermore, the front positioning assembly 14 includes a cylindrical roller bearing 18, a shaft seal seat 19, a bearing retaining ring 20, a second hole elastic retaining ring 21, a shaft elastic retaining ring 22, and an oil seal 23. The cylindrical roller bearing 18 and the shaft seal seat 19 are both sleeved between the front positioning part 16 and the inner wall of the drive shaft extension inlet 13. An oil seal annular groove 24 is formed between the shaft seal seat 19 and the front positioning part 16. The oil seal 23 is disposed in the oil seal annular groove 24. The inner wall of the drive shaft extension inlet 13 is concave. A limiting annular groove 25 is formed, and an elastic retaining ring 21 for the second hole is disposed within the limiting annular groove 25. One side of the elastic retaining ring 21 for the second hole extends out of the limiting annular groove 25 and connects with the shaft seal seat 19 to limit the axial position of the shaft seal seat 19 on the front positioning part 16. The shaft elastic retaining ring 22 is disposed on the side of the front positioning part 16 near the shaft seal seat 19, and the shaft elastic retaining ring 22 limits the axial position of the cylindrical roller bearing 18 on the front positioning part 16. Specifically, in this embodiment, the front positioning assembly 14 is designed such that the cylindrical roller bearing 18 and the shaft seal seat 19 are jointly sleeved between the front positioning part 16 and the inner wall of the transmission shaft extension inlet 13. The cylindrical roller bearing 18 mainly bears the radial load to ensure the smoothness of the transmission shaft 4 during rotation, while the shaft seal seat 19 plays a role in sealing and auxiliary positioning. The oil seal annular groove 24 formed between the shaft seal seat 19 and the front positioning part 16 provides a suitable installation space for the oil seal 23. The oil seal 23 can effectively prevent hydraulic oil from leaking from the gap between the drive shaft 4 and the drive shaft extension 13, ensuring the sealing performance of the hydraulic system. The limiting annular groove 25 formed by the indentation on the inner wall of the drive shaft extension 13, and the elastic retaining ring 21 for the second hole set therein, with one side of the elastic retaining ring 21 extending out of the limiting annular groove 25 and connecting with the shaft seal seat 19, precisely limit the axial position of the shaft seal seat 19 on the front positioning part 16, preventing the shaft seal seat 19 from moving axially during the operation of the drive shaft 4. The shaft elastic retaining ring 22 set on the side of the cylindrical roller bearing 18 near the shaft seal seat 19 in the front positioning part 16 limits the axial position of the cylindrical roller bearing 18 on the front positioning part 16, avoiding axial movement of the cylindrical roller bearing 18. This design of the front positioning assembly 14 provides precise positioning and effective sealing of the front end of the drive shaft 4 from multiple aspects.

[0020] Furthermore, the rear positioning assembly 15 includes a needle roller bearing 26 and a shaft wire retainer 27. The needle roller bearing 26 is sleeved between the rear positioning part 17 and the rear cover 2. The shaft wire retainer 27 is located on the side of the rear positioning part 17 where the needle roller bearing 26 is closer to the rear cover 2. The shaft wire retainer 27 limits the axial position of the needle roller bearing 26 on the rear positioning part 17. Specifically, in this embodiment, a bearing groove is formed inward on the rear cover 2. The needle roller bearing 26 in the rear positioning assembly 15 is sleeved in the bearing groove between the rear positioning part 17 and the rear cover 2. The needle roller bearing 26 has a high radial load-bearing capacity and can effectively support the rear end of the drive shaft 4, ensuring its stability during high-speed operation and under large loads. A wire retaining ring 27 is installed on the rear positioning part 17, on the side of the needle roller bearing 26 near the rear cover 2. This reliably limits the axial position of the needle roller bearing 26 on the rear positioning part 17, preventing axial displacement of the needle roller bearing 26 during the operation of the drive shaft 4. This ensures precise positioning of the rear positioning assembly 15 on the rear end of the drive shaft 4. This design of the rear positioning assembly 15, in conjunction with the front positioning assembly 14, provides comprehensive and stable positioning support for the drive shaft 4, further improving the smoothness and reliability of the hydraulic motor during operation. It effectively reduces vibration, noise, and component wear caused by inaccurate positioning of the drive shaft 4, extending the service life of the hydraulic motor.

[0021] Furthermore, a plunger 28 is provided on the cylinder body 5, and a slipper assembly 29 is provided between the plunger 28 and the inner wall of the inner cavity 3. The slipper assembly 29 includes a slipper body 30, a return plate 31, and a friction plate 32. The slipper body 30 is disposed between the return plate 31 and the friction plate 32. The return plate 31 is disposed on the side of the slipper body 30 closer to the plunger 28. One end of the plunger 28 is connected to the cylinder body 5, and the other end of the plunger 28 abuts against the return plate 31. The friction plate 32 is disposed on the side of the slipper away from the return plate 31, and the friction plate 32 is in contact with the inner wall of the inner cavity 3. Specifically, in this embodiment, the slipper body 30 is attached to the friction plate 32, and the slipper body 30 is pressed onto the friction plate 32 by the clamping force of the return plate 31. The clamping force is transmitted to the ball joint 34 through the ball joint spring 33. The ball joint transmits the spring force to the slipper body 30 through the ball joint contact between the return plate 31 and the slipper body 30, so that the slipper body 30 fits tightly against the friction plate 32. This ensures that the plunger 28 can maintain better contact with the friction plate 32 in the low-pressure area or start-up phase when the hydraulic motor is working, and avoids the plunger 28 from "disengaging from the plate".

[0022] Furthermore, the inner wall of the inner cavity 3, which connects to the friction disc 32, is inclined at an angle of 17°. Specifically, in this embodiment, the inner wall of the inner cavity connecting to the friction disc is designed to be inclined at an angle of 17°. This structure allows the friction disc to better fit against the inner wall of the cavity during the operation of the hydraulic motor. During the reciprocating motion of the plunger, the inclined inner wall provides more stable support for the friction disc, reducing friction disc wobbling or displacement caused by plunger movement. Simultaneously, this inclined arrangement facilitates the flow and distribution of hydraulic oil between the friction disc and the inner wall, allowing the hydraulic oil to act more evenly on the friction disc surface, further improving the working condition of the friction disc, increasing the working efficiency and stability of the hydraulic motor, reducing component wear caused by uneven friction, and extending the service life of the hydraulic motor.

[0023] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hydraulic motor, comprising a housing and a rear cover, the rear cover being disposed on one side of the housing and connected to the housing, an inner cavity being formed within the housing, a drive shaft being disposed on the housing, one end of the drive shaft passing through the inner cavity and connected to the rear cover, and a cylinder and a distribution plate being sleeved on the portion of the drive shaft located within the inner cavity, characterized in that: A cylinder spring is installed inside the cylinder body, and a spring groove is formed between the cylinder body and the drive shaft. The cylinder spring is sleeved on the part of the drive shaft located in the spring groove. A spring limiting component is installed on the drive shaft, and the spring limiting component limits the position of the cylinder spring on the drive shaft. The cylinder body is pressed against the oil distribution plate under the action of the cylinder spring.

2. The hydraulic motor according to claim 1, characterized in that: The spring limiting assembly includes two cylinder gaskets located at the two ends of the drive shaft and an elastic retaining ring with a first hole located on the side of the drive shaft near the rear cover. The elastic retaining ring with the first hole is connected to the cylinder gasket near the rear cover, and the cylinder spring is located between the two cylinder gaskets.

3. The hydraulic motor according to claim 1, characterized in that: A drive shaft positioning assembly is provided on the drive shaft, and the housing has a drive shaft inlet. The drive shaft positioning assembly includes a front positioning assembly disposed between the drive shaft and the inner wall of the drive shaft inlet, and a rear positioning assembly disposed between the drive shaft and the rear cover. The drive shaft has a front positioning part and a rear positioning part, and the front positioning assembly and the rear positioning assembly are respectively sleeved on the front positioning part and the rear positioning part.

4. The hydraulic motor according to claim 3, characterized in that: The front positioning assembly includes a cylindrical roller bearing, a shaft seal seat, a bearing retaining ring, a second hole elastic retaining ring, a shaft elastic retaining ring, and an oil seal. The cylindrical roller bearing and shaft seal seat are both fitted between the front positioning portion and the inner wall of the drive shaft extension inlet. An oil seal annular groove is formed between the shaft seal seat and the front positioning portion. The oil seal is disposed within the oil seal annular groove. A limiting annular groove is formed by an indentation on the inner wall of the drive shaft extension inlet. The second hole elastic retaining ring is disposed within the limiting annular groove. One side of the second hole elastic retaining ring extends out of the limiting annular groove and connects with the shaft seal seat, limiting the axial position of the shaft seal seat on the front positioning portion. The shaft elastic retaining ring is disposed on the side of the front positioning portion near the shaft seal seat, and it limits the axial position of the cylindrical roller bearing on the front positioning portion.

5. The hydraulic motor according to claim 3, characterized in that: The rear positioning assembly includes a needle roller bearing and a wire retaining ring for the shaft. The needle roller bearing is sleeved between the rear positioning part and the rear cover. The wire retaining ring for the shaft is located on the side of the rear positioning part where the needle roller bearing is close to the rear cover. The wire retaining ring for the shaft limits the axial position of the needle roller bearing on the rear positioning part.

6. The hydraulic motor according to claim 1, characterized in that: A plunger is provided on the cylinder body, and a slipper assembly is provided between the plunger and the inner wall of the cavity. The slipper assembly includes a slipper body, a return plate, and a friction plate. The slipper body is located between the return plate and the friction plate. The return plate is located on the side of the slipper body closer to the plunger. One end of the plunger is connected to the cylinder body, and the other end of the plunger abuts against the return plate. The friction plate is located on the side of the slipper away from the return plate and is in contact with the inner wall of the cavity.

7. The hydraulic motor according to claim 6, characterized in that: The inner wall of the cavity that connects with the friction disc is inclined at an angle of 17°.

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