A bidirectional radial piston pump with axial flow distribution

Abstract

This invention relates to a bidirectional radial piston pump with axial flow distribution, comprising a front end cover, a drive shaft, a return ring, a pump housing, a spacer ring, a rear end cover, a distribution shaft, a guide post retainer, a cylinder body, pistons, bearings, and guide posts. Multiple internal bores of the cylinder body are fitted with pistons, each piston equipped with a guide post. Return rings and guide post retainers are mounted on both sides of the cylinder body. The return rings are used for circumferential jacking of the guide posts, enabling the radial piston pump to operate normally under low-speed conditions. The guide post retainers limit the deflection of the guide posts. This invention, through a novel piston structure, enables the radial piston pump (oil motor) to operate normally under low-speed conditions, reduces piston wear during operation, and extends the lifespan of the radial piston pump (oil motor) employing a distribution shaft structure.

Description

Technical Field

[0001] This invention relates to a bidirectional radial piston pump, and more particularly to a axially distributed bidirectional radial piston pump (oil motor). Background Technology

[0002] Currently, most radial piston pumps (oil motors) with axial flow use embedded high-strength ceramic balls or integrated piston structures with spherical surfaces. These pistons have point contact with the inner ring of the bearing, and the friction pair is static friction. During operation, they are prone to wear due to unbalanced forces, which seriously affects the lifespan of the radial piston pump (oil motor) with axial flow. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the present invention provides a bidirectional radial piston pump (oil motor) with axial flow distribution. The piston pump can realize bidirectional function, and the number of piston rows can be matched according to the actual required flow rate.

[0004] To achieve the above objectives, the technical solution of the present invention is: a bidirectional radial piston pump with axial flow distribution, comprising a front end cover, a drive shaft, a return ring, a pump housing, a spacer ring, a rear end cover, a flow distribution shaft, a guide post retainer, a cylinder body, pistons, bearings, and guide posts. Multiple internal bores of the cylinder body are respectively equipped with pistons, and each piston is fitted with a guide post. Return rings and guide post retainers are respectively installed on both sides of the cylinder body. The return rings are used for circumferential jacking of the guide posts, enabling the radial piston pump to operate normally under low-speed conditions. The guide post retainers are used to limit the deflection of the guide posts.

[0005] Furthermore, the plunger is provided with a throttling orifice for pressure balance of the guide column.

[0006] Furthermore, the cylinder body is equipped with a distribution shaft, which has two oil ports for switching between oil intake and oil discharge; the distribution shaft is also equipped with a pressure equalization groove, and pressure guide holes are provided at the pressure equalization groove for pressure balance of the cylinder body.

[0007] Furthermore, the number of plunger rows is set to single row, double row, or multiple rows according to the flow requirements. When there are double or multiple rows of plungers, each row of plungers is staggered.

[0008] Furthermore, the front cover, pump housing, and rear cover are fastened together by screws, and sealing rings are installed on both the front cover and the rear cover for radial sealing to prevent oil leakage at the joint surface between the front and rear covers and the pump housing.

[0009] Furthermore, the pump housing is equipped with bearings according to the number of plunger rows, and spacer rings are installed between the bearings for isolation between them.

[0010] Furthermore, a sealing assembly is installed between the drive shaft and the front cover, and the cylinder body and the drive shaft are fixedly connected by a cylindrical pin and a shaft elastic retaining ring. Bearings are installed on both sides of the cylinder body, and a sealing cover, a sealing gasket, and a positioning cylindrical pin are installed at the tail end of the distribution shaft.

[0011] Furthermore, when the cylinder rotates under the drive of the motor, the guide pin mounted on the plunger fits against the inner ring of the bearing on one side and the outer circle of the return ring on the other. There is a certain amount of eccentricity between the cylinder and the bearing. Due to the effect of the eccentricity, the volume between the plunger and the cylinder continuously changes. When the volume increases, one side achieves the oil suction function, and when the volume decreases, the other side achieves the oil discharge function. When the motor reverses, the oil suction and oil discharge functions of the two oil ports are interchanged, realizing the bidirectional function of the radial plunger pump.

[0012] The advantages and beneficial effects of this invention are:

[0013] 1) A throttling orifice is provided inside the plunger to balance the pressure of the guide column, which reduces the radial force on the plunger. In addition, the contact between the plunger and the inner ring of the bearing is changed from point contact in the traditional structure to line contact, and the friction pair is changed from static friction to rolling friction. This improvement measure greatly reduces the wear of the plunger during the movement process and extends the service life of the radial plunger pump (oil motor).

[0014] 2) Return rings are installed on both sides of the cylinder block. The return rings are used to support the circumferential jacking of the guide column, so that the radial piston pump (oil motor) can work normally under low-speed conditions, reducing the minimum speed required by the radial piston pump (oil motor).

[0015] 3) Guide column retainers are installed on both sides of the cylinder block to limit the deflection of the guide column, thereby improving the reliability of the radial piston pump (oil motor).

[0016] 4) The number of plunger rows can be designed as single row, double row, or multiple rows according to flow requirements. It can be matched according to the actual flow needs, with a high degree of modularity and wide applicability. Attached Figure Description

[0017] Figure 1 This is a main sectional view of the axial flow distribution bidirectional radial piston pump structure of the present invention;

[0018] Figure 2 This is a cross-sectional view of the axial flow distribution bidirectional radial piston pump of the present invention.

[0019] Figure 3 This is a schematic diagram of the cross-sectional structure of the plunger;

[0020] Figure 4 This is a schematic diagram of the cross-sectional structure of the cylinder block;

[0021] Reference numerals: 1. Front end cover, 2. Drive shaft, 3. Return ring, 4. Pump housing, 5. Spacer ring, 6. Rear end cover, 7. Distribution shaft, 8. Guide column retainer, 9. Cylinder block, 10. Plunger, 11. Bearing, 12. Guide column. Detailed Implementation

[0022] To facilitate understanding of the present invention, a more detailed and comprehensive description is provided below, with accompanying drawings illustrating one embodiment. The present invention can be implemented in different forms and is not limited to this embodiment.

[0023] like Figures 1 to 4 As shown in the figure, an embodiment of the present invention provides a bidirectional radial piston pump (oil motor) with axial flow distribution, comprising: a front end cover 1, a drive shaft 2, a return ring 3, a pump housing 4, a spacer ring 5, a rear end cover 6, a flow distribution shaft 7, a guide column retainer 8, a cylinder body 9, a piston 10, a bearing 11, and a guide column 12.

[0024] The front cover 1, pump housing 4, and rear cover 6 are fastened together by screws. Both the front cover 1 and the rear cover 6 are equipped with sealing rings for radial sealing to prevent oil leakage at the joint surface between the front and rear covers and the pump housing.

[0025] The cylinder body 9 has several internal cavity holes, and the plungers 10 are respectively installed in the internal cavity holes of the cylinder body 9. When there are multiple rows of plungers, each row of plungers is staggered. Each plunger is equipped with a guide post 12, and a return ring 3 and a guide post retainer 8 are respectively installed on both sides of the cylinder body 9. The return ring 3 is used for circumferential pushing of the guide post 12, and the guide post retainer 8 is used to limit the deflection of the guide post 12.

[0026] A throttling orifice is provided inside the plunger 10 to balance the pressure of the guide column 12.

[0027] Inside the cylinder 9, there is a distribution shaft 7 with two oil ports for oil suction and oil discharge respectively. The distribution shaft 7 is provided with a pressure equalization groove and a pressure guide hole for pressure balance of the cylinder 9.

[0028] Inside the pump housing 4, bearings 11 are installed according to the number of plunger rows, and spacer rings 5 ​​are installed between the bearings 11 for isolation between the bearings 11.

[0029] A sealing assembly is installed between the drive shaft 2 and the front cover 1. The cylinder body 9 and the drive shaft 2 are fixedly connected by a cylindrical pin and a shaft elastic retaining ring. Bearings are installed on both sides of the cylinder body 9. A sealing cover, a sealing gasket, and a positioning cylindrical pin are installed at the tail end of the distribution shaft 7.

[0030] When the cylinder 9 rotates under the drive of the motor, the guide pin 12 mounted on the plunger 10 engages with both the inner ring of the bearing 11 and the outer circle of the return ring 3. A certain eccentricity d exists between the cylinder 9 and the bearing 11. Due to this eccentricity d, the volume between the plunger 10 and the cylinder 9 continuously changes. When the volume increases, one side performs oil suction; when the volume decreases, the other side performs oil discharge. When the motor reverses, the oil suction and discharge functions of the two ports are interchanged, achieving a bidirectional function for the radial plunger pump (oil motor).

[0031] The above implementation examples only illustrate one design scheme of the present invention and should not be construed as limiting the patent of the present invention. Based on these implementation examples, the novel radial piston pump (oil motor) of the present invention can be further improved. Therefore, the patent protection scope of the present invention should be determined by the appended claims.

Claims

1. A bidirectional radial piston pump with axial flow distribution, comprising a front end cover, a drive shaft, a return ring, a pump housing, a spacer ring, a rear end cover, a flow distribution shaft, a guide post cage, a cylinder block, a piston, a bearing, and a guide post, characterized in that: The cylinder body has multiple internal bores in which plungers are installed, and each plunger is equipped with a guide post. Return rings and guide post retainers are installed on both sides of the cylinder body. The return rings are used for circumferential jacking of the guide posts, enabling the radial plunger pump to operate normally at low speeds. The guide post retainers limit the deflection of the guide posts. Throttling orifices are provided inside the plungers for pressure balance of the guide posts. A distribution shaft is installed inside the cylinder body, with two oil ports for switching between oil suction and discharge. A pressure equalization groove is provided on the distribution shaft, with pressure guiding holes at each groove for pressure balance within the cylinder body. The number of plunger rows is set to single or multiple rows according to flow requirements; when multiple rows are used, each row of plungers is staggered.

2. The bidirectional radial piston pump with axial flow distribution according to claim 1, characterized in that: The front cover, pump housing, and rear cover are fastened together by screws. Both the front cover and the rear cover are equipped with sealing rings for radial sealing to prevent oil leakage at the joint surface between the front and rear covers and the pump housing.

3. The bidirectional radial piston pump with axial flow distribution according to claim 1, characterized in that: The pump casing is equipped with bearings according to the number of plunger rows, and spacer rings are installed between the bearings for isolation between them.

4. The bidirectional radial piston pump with axial flow distribution according to claim 1, characterized in that: A sealing assembly is installed between the drive shaft and the front cover. The cylinder body and the drive shaft are fixedly connected by a cylindrical pin and a shaft elastic retaining ring. Bearings are installed on both sides of the cylinder body. A sealing cover, a sealing gasket, and a positioning cylindrical pin are installed at the tail end of the distribution shaft.

5. The bidirectional radial piston pump with axial flow distribution according to claim 1, characterized in that: When the cylinder rotates under the drive of the motor, the guide pin mounted on the plunger fits against the inner ring of the bearing on one side and the outer circle of the return ring on the other. There is a certain amount of eccentricity between the cylinder and the bearing. Due to the effect of the eccentricity, the volume between the plunger and the cylinder changes continuously. When the volume increases, one side performs the oil suction function, and when the volume decreases, the other side performs the oil discharge function. When the motor reverses, the oil suction and oil discharge functions of the two oil ports are interchanged, realizing the bidirectional function of the radial plunger pump.

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