High-torque high-speed distribution cycloid hydraulic motor

Abstract

The utility model discloses a motor technical field's big torque high -speed distribution flow cycloid hydraulic motor. This motor includes body shell, output shaft structure, rotation stator pair, distribution flow support plate, pressure compensation board and back cover, the center inner hole diameter of distribution flow support plate is increased, the composition arc radius of distribution flow hole of the inmost layer of distribution flow support plate is close to the center inner hole and is increased, and the purpose is to strengthen the spline major diameter of linkage shaft and the middle part diameter of linkage shaft. The utility model has the advantages of improving the ability of the linkage bearing of motor to bear big torque.

Description

Technical Field

[0001] This utility model relates to a hydraulic motor that converts hydraulic energy into mechanical energy, and more particularly to a planar distribution cycloidal hydraulic motor, belonging to the field of hydraulic transmission technology. Background Technology

[0002] Cycloidal hydraulic motors are commonly used hydraulic drive devices. They are low-speed, high-torque motors with advantages such as small size, high power density, high efficiency, and wide speed range, and have been widely used. As my country's industrial and agricultural development level further improves, their application will become even more widespread.

[0003] The basic structure of this type of device consists of an inlet and a return port on the housing or rear cover. One end is equipped with a cycloidal pinwheel engagement pair and a distribution mechanism. The distribution mechanism can be placed before or after the cycloidal pinwheel engagement pair; generally, the front (on the housing side) uses a shaft valve for distribution, with the distribution system axially arranged on a circular surface, while the rear (on the rear cover side) uses a planar distribution system, with the distribution system radially arranged in a planar plane. The other end is equipped with an output shaft. The rotor of the cycloidal pinwheel engagement pair meshes with the external teeth at one end of the linkage shaft via internal splines, and the other end of the linkage shaft is connected to the output shaft for transmission. During operation, the distribution mechanism connects the inlet to the expanded engagement chamber of the cycloidal pinwheel engagement pair and connects the contracted chamber of the cycloidal pinwheel engagement pair to the return port. As a result, pressurized fluid enters the housing or rear cover through the inlet and then flows into the expanding engagement chamber formed by the cycloidal pinwheel meshing pair, causing its volume to continuously increase. Simultaneously, fluid in the contracting engagement chamber of the cycloidal pinwheel meshing pair flows back through the return port. During this process, the rotor of the cycloidal pinwheel meshing pair is driven to rotate by the pressure difference between the expanding and contracting engagement chambers, and this rotation is transmitted to the output shaft via the linkage shaft, thus realizing the conversion of hydraulic energy into mechanical energy. At the same time, the distribution mechanism is also driven to rotate by the linkage shaft, continuously switching between connected states to continue the conversion process. In this way, the motor can continuously output torque. It can be said that the cycloidal pinwheel meshing pair and the distribution mechanism are the core of the hydraulic motor.

[0004] High-speed flow distribution, as a type of planar flow distribution, uses a flow distribution mechanism that follows the revolution and rotation motion of the rotor of the rotor-stator pair to distribute the flow, achieving a flow distribution motion that is a multiple of the motor speed.

[0005] According to the applicant, existing high-speed cycloidal hydraulic motors have limited inner hole dimensions of the support plate (as shown in Chinese Patent Publication No. CN 206582058 U, titled "A High-Speed ​​Cycloidal Hydraulic Motor"), resulting in a relatively small central dimension of the linkage shaft, typically between Ф23 and Ф25.6. Their maximum torque output capacity is generally recommended to be less than 1000 Nm. This structure is unfavorable for applications requiring larger displacement motors with higher torque output, and in severe cases, may lead to insufficient strength and breakage in the middle section, necessitating the selection of larger series motors.

[0006] To adapt to the evolving application fields and provide reliable products, and to expand the application conditions of this structure, a higher strength motor structure is needed to ensure high product reliability. Summary of the Invention

[0007] To achieve the above objectives, the applicant analyzed the structure of existing high-speed distribution cycloidal hydraulic motors and studied the structural layout of existing multi-piece composite distribution support plates. The applicant identified the limiting aspects of the existing structure and proposed a high-torque high-speed distribution cycloidal hydraulic motor with an innovative structure, simple manufacturing process, and minimal cost variation to overcome the insufficient torque output capability of the existing technology.

[0008] To achieve the above-mentioned utility model objectives, the present utility model adopts the following technical solution: A high-torque, high-speed cycloidal hydraulic motor includes a housing with a mounting flange surface, an output shaft structure for torque output housed within the housing, and a distribution system composed of a rotor-stator pair and a distribution support plate. The housing, distribution support plate, rotor-stator pair, pressure compensation plate, and rear cover are fixed together by connecting bolts. The improvement lies in that the diameter of the central inner hole of the multi-piece composite distribution support plate of the distribution system is increased, and the radius of the arc of the innermost distribution hole of the distribution support plate that meshes with the rotor distribution groove of the rotor-stator pair near the central inner hole is increased.

[0009] The innermost distribution hole is symmetrical about the coordinates. The radii of the two arcs of the distribution hole are increased at equal intervals, and the intersection point of the two arcs moves accordingly.

[0010] The innermost distribution hole radius is increased by being evenly distributed in a circle divided into 7 equal parts around the center of the distribution support plate.

[0011] Furthermore, the diameter of the central part of the linkage shaft enclosed by the central inner hole of the flow distribution support plate is thickened to improve the overall strength and load-bearing capacity of the linkage shaft.

[0012] The parameters of the external splines at both ends of the linkage shaft are adjusted, and the major and minor diameters of the external splines are increased.

[0013] The spline parameters of the output shaft meshing with the external spline of the linkage shaft are adjusted synchronously, and the spline parameters of the rotor meshing with the external spline of the linkage shaft are adjusted synchronously, with the same spline module.

[0014] Furthermore, the spline module adopts the standard involute spline module, and the displacement coefficient is selected to ensure that the major diameter of the external spline is close to Ф35.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention, by enlarging the central inner hole of the flow distribution support plate in a traditional structure and optimizing its innermost flow distribution hole, transcends conventional thinking and demonstrates innovative thinking. This allows the motor linkage shaft to be adapted to a greater load-bearing capacity, effectively enabling the large displacement products to withstand greater torque under higher pressure. This expands the product's applicability, reduces the risk of broken linkage shafts in large displacement products, and improves product reliability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] The diagram shows the following components: 1. Output shaft; 2. Key; 3. Dustproof ring; 4. Housing; 5. Front bearing; 6. Oil port cover; 7. Sealing ring; 8. Distribution support plate; 9. Stator pair; 10. Steel ball; 11. Pressure balance plate; 12. Connecting bolt; 13. Rear cover; 14. Sealing ring; 15. Sealing ring; 16. Compensating pad; 17. Linkage shaft; 18. Surface bearing; 19. Rear bearing; 20. Surface bearing; 21. Surface bearing retaining ring; 22. Skeleton shaft seal; 23. Hole retaining ring; 24. Sealing ring.

[0018] Figure 2 This is a structural schematic diagram of sequence 8 of embodiment 1 of this utility model.

[0019] Figure 3 This is Embodiment 1 of the present utility model. Figure 2 The right view.

[0020] Figure 4 This is a structural schematic diagram of sequence 17 of embodiment 1 of this utility model. Detailed Implementation Example

[0021] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are only for illustrating the present invention and not for limiting the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0022] like Figure 1As shown, a high-torque, high-speed cycloidal hydraulic motor includes a housing 4 with a mounting flange, an output shaft 1 for torque output housed within the housing 4, and the output shaft 1 supported by a front bearing 5 and a rear bearing 19 within the mounting hole of the housing 4. A distribution system is formed by a rotor-stator pair 9 and a distribution support plate 8. The distribution slots of the rotor in the rotor-stator pair 9 and the evenly distributed oil passages of the distribution support plate 8 form a continuous and stable distribution relationship during movement. The housing 4, distribution support plate 8, rotor-stator pair 8, pressure compensation plate 11, and rear cover 13 are fixed together by connecting bolts 12 to form the motor as a single unit. The central inner diameter of the multi-piece composite distribution support plate of the distribution system is enlarged. The distribution support plate 8 of the distribution system is formed by brazing multiple support plates with distribution channels, becoming a single unit with evenly distributed channels for high-pressure and low-pressure oil. Figure 2 The diameter D of the central inner hole of the distribution support plate 8 shown is increased, and the radius of the arc of the innermost distribution hole of the distribution support plate 8 that meshes with the rotor distribution groove of the rotor-stator pair 9 near the central inner hole is increased.

[0023] Specifically, such as Figure 2 The diameter D of the central inner hole of the flow distribution support plate 8 shown is increased from Ф33~Ф33.5mm in the prior art to Ф35.1~Ф35.5mm.

[0024] like Figure 3 As shown, the innermost distribution hole d is symmetrical about the coordinates. The radii R of the two arcs of the distribution hole d are increased at equal intervals. The intersection point of the two arcs R moves accordingly. After the two arcs R are increased at equal intervals, a new intersection point is formed. The distance from the intersection point to the center also increases accordingly. The intersection points of the two arcs R with other lines also change adaptively.

[0025] Similarly, as Figure 3 The innermost distribution hole d shown is obtained by increasing the radius R of the arc and then evenly distributing it in a circle that is divided into 7 equal parts about the center of the distribution support plate.

[0026] Specifically, the radius R of the arc is increased from 19.00-19.15 mm in the prior art to 19.8-20.1 mm, and the radius of the arc changes accordingly after the increase.

[0027] because Figure 2 Inner diameter D and Figure 3 The change in the radius R of the arc shown, which breaks away from habitual thinking, directly leads to an increase in the space of the linkage axis in existing technologies, giving it more methods and paths to strengthen its strength.

[0028] Figure 3The flow distribution support plate 8 shown has channels for evenly distributing high-pressure and low-pressure oil, which are composed of flow distribution holes b, c, and d as shown. The layer of flow distribution holes b communicates with the layer of evenly distributed flow distribution holes d, and they are evenly distributed circumferentially. The layer of flow distribution holes c communicates with... Figure 2 The flow distribution holes on the left side of the flow distribution support plate 8 are connected to each other and are also evenly distributed around the circumference; the flow distribution holes on the left side of the flow distribution support plate 8 are connected to... Figure 1 The axial oil passages of the shell 4 are connected.

[0029] like Figure 1 As shown, furthermore, the diameter of the middle part of the linkage shaft 17 enclosed by the central inner hole of the flow distribution support plate 8 is thickened, thereby improving the overall strength and bearing capacity of the linkage shaft 17.

[0030] like Figure 4 The purpose of adjusting the external spline parameters at both ends of the linkage shaft is to increase the major and minor diameters of the external splines at both ends of the linkage shaft. This allows for the thickening of the diameter in the middle of the linkage shaft, which can easily improve the strength and other properties of the linkage shaft under the same material and process conditions. The figure shows the diameter E of the middle of the linkage shaft.

[0031] like Figure 1 The spline parameters of the output shaft 1, which meshes with the external spline of the linkage shaft 17, are also adjusted synchronously. The internal spline of the rotor of the stator pair 9, which meshes with the external spline of the linkage shaft 17, is also adjusted synchronously to ensure the consistency of the internal and external spline meshing parameters.

[0032] Furthermore, the linkage shaft 17 and its meshing spline adopt a standard involute spline module, and the displacement coefficient is selected to ensure that the major diameter of the external spline of the spline meshing pair is close to Ф35, and to ensure that the series motors can operate reliably.

[0033] Preferred, such as Figure 4 As shown, the splines at both ends of the linkage shaft adopt a standard spline module of m2.5 and a spline tooth count of 12. The external spline major diameter is made close to Ф35 by means of displacement, such as displacement coefficient +0.5.

[0034] The structural innovation of this utility model makes the central diameter E of the linkage shaft that bears the torque output thicker, from the existing Ф23 to Ф25.6 to the Ф25 to Ф28.5.

[0035] The foregoing description illustrates and describes preferred embodiments of the present invention. As previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or related technical or knowledge. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A high-torque, high-speed cycloidal hydraulic motor, comprising a housing with a mounting flange, an output shaft structure for torque output housed within the housing, and a distribution system consisting of a rotor-stator pair and a distribution support plate, wherein the housing, distribution support plate, rotor-stator pair, pressure compensation plate, and rear cover are integrally connected by connecting bolts; characterized in that: The diameter of the central inner hole of the multi-piece composite distribution support plate of the distribution system is increased, and the radius of the arc of the innermost distribution hole of the distribution support plate that meshes with the rotor distribution groove of the rotor-stator pair is increased.

2. The high-torque, high-speed cycloidal hydraulic motor according to claim 1, characterized in that: The innermost distribution hole is symmetrical about the coordinates. The radii of the two arcs of the distribution hole are increased at equal intervals, and the intersection point of the two arcs moves accordingly. The innermost distribution hole radius is increased by being evenly distributed in a circle divided into 7 equal parts around the center of the distribution support plate.

3. The high-torque, high-speed cycloidal hydraulic motor according to claim 1, characterized in that: The diameter of the central part of the linkage shaft enclosed by the central inner hole of the flow distribution support plate is thickened to improve the overall strength and load-bearing capacity of the linkage shaft.

4. The high-torque, high-speed cycloidal hydraulic motor according to claim 3, characterized in that: The parameters of the external splines at both ends of the linkage shaft are adjusted, and the major and minor diameters of the external splines are increased.

5. A high-torque, high-speed cycloidal hydraulic motor according to claim 4, characterized in that: The spline parameters of the output shaft meshing with the external spline of the linkage shaft are adjusted synchronously, and the spline parameters of the rotor meshing with the external spline of the linkage shaft are adjusted synchronously, with the same spline module.

6. The high-torque, high-speed cycloidal hydraulic motor according to claim 4, characterized in that: The spline module adopts the standard involute spline module, and the displacement coefficient is selected to ensure that the major diameter of the external spline is close to Ф35.

7. The high-torque, high-speed cycloidal hydraulic motor according to claim 1, characterized in that: The diameter D of the central inner hole of the distribution support plate is increased from Ф33~Ф33.5mm in the prior art to Ф35.1~Ф35.5mm.

8. The high-torque, high-speed cycloidal hydraulic motor according to claim 1, characterized in that: The radius R of the arc is increased from 19.00-19.15 mm in the prior art to 19.8-20.1 mm, and the radius of the arc changes accordingly after the increase.

9. A high-torque, high-speed cycloidal hydraulic motor according to claim 4, characterized in that: The splines at both ends of the linkage shaft adopt a standard spline module of m2.5 and 12 spline teeth. By using a displacement method, the major diameter of the external spline is close to Ф35. The displacement adopts a displacement coefficient of +0.

5.

10. A high-torque, high-speed cycloidal hydraulic motor according to claim 3, characterized in that: The diameter of the middle part of the linkage shaft is thickened, from the existing range of Ф23 to Ф25.6 to the range of Ф25 to Ф28.5.

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