High-speed flow distribution cycloid hydraulic motor

Abstract

The utility model relates to a high-speed flow distribution cycloid hydraulic motor, and belongs to the technical field of hydraulic transmission. Comprising a body shell internally provided with two oil ducts, one oil duct 2 is connected with an axial hole formed in the body shell, the other oil duct 1 is connected with an oil type annular section channel arranged between the other oil duct 1 and an inner hole of the body shell, a center inner hole, where a front bearing and a rear bearing are installed, of the body shell is a through hole, and the front bearing and the rear bearing are limited through a thin-wall bearing check ring. A front cover with an installation spigot and a front cover high-pressure framework shaft seal are arranged at the front end of the body shell in a limiting mode. The utility model has the advantages of compact structure, light weight, simple integral structure, good manufacturability, and good assembly and maintenance manufacturability.

Description

Technical Field

[0001] This utility model relates to a cycloidal hydraulic motor that converts hydraulic energy into mechanical energy, 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 and 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 use an integral housing structure (as shown in patent document CN203685462 U). The rotary shaft seal and the front needle roller bearing are installed in a deep hole in the housing. The deep hole is difficult to machine, which may lead to dimensional instability, assembly process issues, and difficulties in inspection and replacement. In addition, the current oil port transition channel structure of the motor is relatively neat and simple, with a large material allowance, which is not conducive to the application of the motor in high flow conditions, resulting in additional flow resistance and material costs. Summary of the Invention

[0006] Therefore, it is necessary to redesign the structure of the cycloidal hydraulic motor, as well as the channels for the housing parts and the simplification of materials.

[0007] The above objective is achieved through the following implementation methods:

[0008] This utility model discloses a high-speed distribution cycloidal hydraulic motor, comprising a housing with two internal oil passages. The two oil passages communicate with the motor's oil inlet A and oil return port B, respectively. One oil passage 2 is connected to an axial hole in the housing. The axial hole has a flat hexagonal cross-section and communicates with the motor's distribution channel. The improvement lies in that: the other oil passage 1 is connected to the inner hole of the housing by an annular cross-section channel for oil. The annular cross-section of the other oil passage 1 connected to the inner hole of the housing is composed of multiple shapes. The annular cross-section is composed of a semicircle and two straight segments of different lengths tangent to it, plus a straight segment that maintains the thickness of the axial hole, and a straight segment protruding to the right oil port. The annular cross-section shape increases the flow area of ​​the hydraulic oil entering the distribution channel.

[0009] The front end of the body shell is provided with a front cover, and the front cover is provided with a step for installation and positioning with the body shell. The step cooperates with the hole in the body shell to radially limit the front cover. A high-pressure skeleton shaft seal for rotating output shaft is provided in the front cover.

[0010] The housing has a front bearing and a rear bearing installed in the central bore. The front bearing and the rear bearing are matched with the output shaft diameter to support the output shaft and enable the front end of the output shaft to withstand a large radial force.

[0011] The central inner hole of the housing for mounting the front and rear bearings is a through hole. The front and rear bearings are limited by a bearing retainer ring. The bearing retainer ring is a thin-walled structure with an oil passage hole in the middle, which communicates with another oil passage 1 in the housing.

[0012] A planar bearing is installed at the front step of the output shaft diameter. The planar bearing abuts against a planar bearing retaining ring, which is installed in the stepped hole of the front cover. The planar bearing retaining ring abuts against the end face of the step to axially limit one end of the output shaft. The circular hole of the front cover step abuts against the outer circular surface of the planar bearing retaining ring to radially limit the output shaft. The other end of the output shaft is axially limited by a planar bearing installed against the front of the distribution support plate.

[0013] One end of the outer circular surface of the front cover serves as the mounting stop for the motor. The front cover and the body shell are fastened with screws and fixedly connected as an integrated device. Nine screws are used for fixing, and two screw holes located in near symmetry are reserved between them for easy disassembly and assembly, so as to facilitate non-destructive disassembly of the front cover during maintenance or inspection.

[0014] The axial hole of the oil passage 2 has a flat hexagonal cross-section, and two machined small holes are used as oil passage holes at the same position as the axial hole.

[0015] The beneficial effects of this utility model after adopting the above technical solution are:

[0016] The cycloidal hydraulic motor of this invention features an annular oil channel between the oil passage 1 and the housing bore. This helps reduce hydraulic resistance and increase the oil flow cross-section within the housing cavity. Simultaneously, it reduces weight and saves material costs while maintaining housing strength and reliability. The two bearing mounting through-hole structure in the housing helps improve the machining accuracy of the bearing mounting holes and reduce machining costs. Furthermore, the use of an independent front cover with a stop structure to house a high-pressure skeleton shaft seal for the rotating output shaft facilitates inspection of the shaft seal installation status during assembly and after-sales maintenance. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the motor structure according to Embodiment 1 of this utility model.

[0019] The components in the diagram are: 1. Output shaft; 2. Key; 3. Dustproof ring; 4. Front cover; 5. Skeleton shaft seal; 6. Surface bearing; 7. Housing; 8. Oil port cover; 9. Rear bearing; 10. Distribution support plate; 11. Rotor-stator pair; 12. Connecting bolt; 13. Pressure balance plate; 14. Steel ball; 15. Rear cover; 16. Sealing ring; 17. Surface bearing; 18. Sealing ring; 19. Linkage shaft; 20. Bearing retaining ring; 21. Front bearing; 22. Surface bearing retaining ring; 23. Sealing ring; 24. Gasket; 25. Screw.

[0020] Figure 2 This is a left view of Embodiment 1 of the present utility model.

[0021] Figure 3 This is a schematic diagram of the oil passage structure in Embodiment 1 of this utility model.

[0022] Oil passage 1, oil passage 2.

[0023] Figure 4 This is a replacement left view of Embodiment 1 of this utility model. Detailed Implementation

[0024] The embodiments of this utility model are described in detail below. These embodiments are implemented based on the technical solution of this utility model and provide detailed implementation methods and specific operation processes. However, the protection scope of this utility model is not limited to the following embodiments.

[0025] The above objective is achieved through the following implementation methods: Example

[0026] See Figure 1 This utility model discloses the basic structure of a high-speed distribution cycloidal hydraulic motor. The high-speed distribution cycloidal hydraulic motor includes a housing 7 with two internal oil passages. The two oil passages communicate with the motor's oil inlet A and return port B, respectively. Figure 3 As shown, one oil passage 2 is connected to an axial hole in the housing 7. The axial hole has a flat hexagonal cross-section and communicates with the distribution channel of the motor distribution support plate 10. Another oil passage 1 is connected to the inner hole of the housing 7 by an annular cross-section channel for oil. The annular cross-section of the other oil passage 1 connected to the inner hole of the housing 7 is composed of multiple shapes. The annular cross-section consists of a semicircle and two straight segments of different lengths tangent to it, plus a straight segment that maintains a certain safety thickness with the axial hole, and a section protruding into... Figure 3 The straight section of the right-side oil port together forms a near-annular cross-section. The near-annular cross-section shape increases the fluid flow area of ​​the hydraulic oil entering the distribution channel, which helps to reduce the fluid resistance of the channel and improve the efficiency of the motor under high flow conditions. In addition, the total weight of the motor is reduced while ensuring the strength and reliability of the housing 7, thereby saving costs.

[0027] The front end of the body shell 7 is provided with a front cover 4. The front cover 4 is provided with a step that limits the installation of the body shell 7. The step cooperates with the hole of the body shell 7 to radially limit the front cover 4. The high pressure skeleton shaft seal 5 of the rotating output shaft 1 is provided in the front cover 4.

[0028] The front bearing 21 and the rear bearing 9 are installed in the central hole of the housing 7. The front and rear bearings are matched with the shaft diameter of the output shaft 1 and support the output shaft 1, while enabling the front end extension of the output shaft 1 to withstand a large radial force.

[0029] The central inner hole of the housing 7, where the front bearing 21 and the rear bearing 9 are installed, is a through hole. The front bearing 21 and the rear bearing 9 are limited by a bearing retainer ring 20 to restrict the axial position range. The bearing retainer ring 20 is a thin-walled structure with an oil passage in the middle, which communicates with another oil passage 1 of the housing 7.

[0030] A planar bearing 6 is provided at the front step of the output shaft 1. The planar bearing 6 abuts against the planar bearing retaining ring 22. The planar bearing retaining ring 22 is installed in the stepped hole of the front cover 4. The planar bearing retaining ring 22 abuts against the end face of the step to axially limit one end of the output shaft 1. The circular hole face of the step of the front cover 4 radially limits the outer circular surface of the planar bearing retaining ring 22. The other end of the output shaft 1 is axially limited by a planar bearing 17 abutting against the front of the distribution support plate 10.

[0031] One end of the outer circular surface of the front cover 4 serves as a mounting stop for the motor, providing positioning during motor application. The front cover 4 and the body shell 7 are fastened together with screws 25, making them a fixedly connected integrated device. Figure 2 As shown, the front cover 4 and the body shell 7 are fixed by nine screws. The nine screws are evenly distributed in the same distribution circle, and a disassembly screw hole is reserved between two screws that are nearly symmetrical. The reserved disassembly screw hole facilitates quick and non-destructive disassembly of the front cover 4 during maintenance or inspection of the skeleton shaft seal 5.

[0032] The sealing between the front cover 4 and the body shell 7 is achieved by a sealing ring 23 for planar sealing. The sealing ring 23 is an O-ring structure and is installed between the screw hole of the front cover 4 and the limiting step of the front cover 4.

[0033] like Figure 4 As shown, the front cover 4 and the body shell 7 are fastened with seven evenly distributed screws.

[0034] The axial hole of the oil passage 2 has a flat hexagonal cross-section, and two machined small holes are used as oil passage holes at the same position as the axial hole.

[0035] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0036] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A high-speed cycloidal hydraulic motor, comprising a housing with two internal oil passages, the two oil passages communicating with the motor's oil inlet A and oil return port B respectively, and an oil passage 2 connected to an axial hole in the housing, the axial hole having a flat hexagonal cross-section and communicating with the motor's distribution channel, characterized in that: Another oil passage 1 is connected to the inner hole of the body shell by an annular cross-section channel for oil. The annular cross-section connecting the other oil passage 1 to the inner hole of the body shell is composed of multiple shapes. The annular cross-section is composed of a semicircle and two straight segments of different lengths tangent to it, plus a straight segment that maintains the thickness with the axial hole, and a straight segment that protrudes to the right oil port. The shape of the annular cross-section increases the flow area of ​​hydraulic oil entering the distribution channel.

2. The high-speed distribution curve swing hydraulic motor according to claim 1, wherein: A front cover is provided at the front end of the body shell. The front cover is provided with a step that limits the installation of the body shell. The step cooperates with the hole in the body shell to limit the radial movement of the front cover. A high-pressure skeleton shaft seal for rotating output shaft is provided in the front cover.

3. The high-speed distribution curve swing hydraulic motor according to claim 1, characterized in that: The housing has a front bearing and a rear bearing installed in the central bore. The front bearing and the rear bearing are matched with the output shaft diameter to support the output shaft and enable the front end of the output shaft to withstand a large radial force.

4. The high-speed distribution curve swing line hydraulic motor according to claim 1, characterized in that: The central inner hole of the housing for mounting the front and rear bearings is a through hole. The front and rear bearings are limited by a bearing retainer ring. The bearing retainer ring is a thin-walled structure with an oil passage hole in the middle, which communicates with another oil passage 1 in the housing.

5. The high-speed distribution curve swing line hydraulic motor according to claim 2, characterized in that: A planar bearing is installed at the front step of the output shaft diameter. The planar bearing abuts against a planar bearing retaining ring, which is installed in the stepped hole of the front cover. The planar bearing retaining ring abuts against the end face of the step to axially limit one end of the output shaft. The circular hole of the front cover step abuts against the outer circular surface of the planar bearing retaining ring to radially limit the output shaft. The other end of the output shaft is axially limited by a planar bearing installed against the front of the distribution support plate.

6. The high-speed distribution curve swing line hydraulic motor according to claim 2, characterized in that: One end of the outer circular surface of the front cover serves as the mounting stop for the motor. The front cover and the body shell are fastened with screws and fixedly connected as an integrated device. Nine screws are used for fixing, and two screw holes for disassembly and assembly are reserved between two nearly symmetrical screws.

7. A high-speed cycloidal hydraulic motor according to claim 1, characterized in that: The axial hole of the oil passage 2 has a flat hexagonal cross-section, and two machined small holes are used as oil passage holes at the same position as the axial hole.

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