A small-displacement, high-speed cycloidal hydraulic motor

Abstract

This utility model relates to a small-displacement, high-speed cycloidal hydraulic motor, belonging to the field of hydraulic transmission technology. The small-displacement motor features a grooved stepped hole at the end of the pressure balance plate that contacts the linkage shaft. The rotor-stator pair parameters are configured to ensure the motor's output displacement is less than 100 ml / r, the stator thickness is less than 10.5 mm, and the linkage shaft's meshing spline is a four-segment toothed structure. This utility model's small-displacement motor boasts a compact structure, stable and reliable small-displacement performance ensured by the rotor-stator pair parameters, and sufficient strength and good heat treatment processability thanks to the short spline of the linkage shaft.

Description

Technical Field

[0001] This utility model relates to a cycloidal hydraulic motor that converts hydraulic energy into mechanical energy, and more particularly to a small-displacement, high-speed cycloidal hydraulic motor with distribution, 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 adopt an integral shell structure (as shown in patent document CN215907991 U), and their minimum displacement is relatively large, such as a nominal displacement of 125 ml / r, and the thickness of the motor rotor-stator pair is greater than 10 mm. Their structure cannot meet the requirements of motors with a displacement of less than 125 ml / r. 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 small-displacement, high-speed cycloidal hydraulic motor, comprising a housing with two internal oil passages. The two oil passages are respectively connected to the motor's oil inlet A and oil return port B. One oil passage is connected to an axial hole in the housing, the axial hole having a flat hexagonal cross-section. The other oil passage is connected to an annular cross-section channel for oil flow between the housing's inner hole and the motor's inner hole. Both oil passages are connected to different distribution channels of the motor. The improvement lies in that the motor is a small-displacement motor, and a grooved stepped hole is provided at the end of the motor's pressure balance plate that contacts the linkage shaft.

[0009] The depth of the stepped hole in the groove of the pressure balance plate is 0.8 to 1.8 mm.

[0010] The output displacement of the small displacement motor is less than 100 ml / r, and the stator thickness of the rotor-stator pair of the small displacement motor is less than 10.5 mm.

[0011] The spline ends at both ends of the linkage shaft are of different lengths; the spline at the meshing end of the inner hole of the output shaft is longer, while the spline at the meshing end of the inner hole of the rotor is shorter.

[0012] The inner hole of the output shaft of the linkage shaft is configured with a four-segment tooth structure, and the tooth profile of the meshing spline is symmetrical.

[0013] The angle between the four toothed sections of the long spline end of the linkage shaft and the axis is γ, which is close to the line of symmetry and the axis, and β, which is far from the line of symmetry and the axis. The angle γ is 3 to 5° and the angle β is 7 to 9°.

[0014] The angle between the four toothed segments of the short spline end of the linkage shaft and the axis is γ when the tooth is close to the line of symmetry, and β when the tooth is far from the line of symmetry. The angle γ is 3-5° and the angle β is 7-9°.

[0015] The spline tooth angles at the long spline end and the short spline end of the linkage shaft are the same, and the corresponding tooth length at the long spline end is greater than the corresponding tooth length at the short spline end.

[0016] Furthermore, the theoretical parameters of the rotor-stator pair of the small displacement motor are: 6 / 7 tooth structure, pin wheel diameter Φ12.65~Φ12.75mm, pin wheel distribution circle diameter Φ78.4~Φ78.7mm, and rotor eccentricity 3~3.1mm.

[0017] Furthermore, the theoretical parameters of the rotor-stator pair of the small displacement motor are: 6 / 7 tooth structure, pin wheel diameter Φ12.7mm, pin wheel distribution circle diameter Φ78.5mm, and rotor eccentricity 3.05mm.

[0018] Furthermore, the output displacement of the small displacement motor is 65ml / r and 80ml / r. The stator thickness of the rotor-stator pair with an output displacement of 65ml / r is 8mm, the stator thickness of the rotor-stator pair with an output displacement of 80ml / r is 9mm, and the stator thickness of the rotor-stator pair with an output displacement of 90ml / r is 10.2mm.

[0019] The beneficial effects of this utility model after adopting the above technical solution are:

[0020] This utility model discloses a small-displacement, high-speed cycloidal hydraulic motor. The stepped hole in the groove of the pressure balance plate helps to allow the thinner internal spline of the rotor-stator pair to mesh with the short spline of the linkage shaft with sufficient strength. This allows the short spline to have a sufficiently deep heat treatment thickness. At the same time, the spline structure of the linkage shaft ensures that the meshing pair is more flexible while maintaining strength and reliability. Furthermore, the rotor-stator pair parameters help to ensure the performance parameters of the small-displacement motor. It also ensures that the small-displacement motor can directly use the components of existing motors with a displacement of 125 ml / r or higher in the same series. Attached Figure Description

[0021] The present invention will now be described in further detail with reference to the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the motor structure according to Embodiment 1 of this utility model.

[0023] The diagram shows the following components: output shaft 1, key 2, dustproof ring 3, hole retaining ring 4, front bearing 5, skeleton shaft seal 6, housing 7, oil port cover 8, rear bearing 9, distribution support plate 10, rotor-stator pair 11, connecting bolt 12, steel ball 13, sealing ring 14, rear cover 15, pressure balance plate 16, sealing ring 17, sealing ring 18, plane bearing 19, linkage shaft 20, plane bearing 21, plane bearing retaining ring 22, and sealing ring 23.

[0024] Figure 2 This is a structural schematic diagram of sequence 20 of embodiment 1 of this utility model.

[0025] Figure 3 This is a partially enlarged schematic diagram of the short spline teeth in sequence 20 of Embodiment 1 of this utility model. Detailed Implementation

[0026] 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.

[0027] The above objective is achieved through the following implementation methods: Example

[0028] See Figure 1This utility model discloses a small-displacement high-speed distribution cycloidal hydraulic motor, including a housing 7 with two internal oil passages. The two oil passages are respectively connected to the motor oil inlet A and oil return port B. One oil passage is connected to an axial hole provided in the housing 7. The axial hole has a flat hexagonal cross-section. The other oil passage is connected to an annular cross-section channel for oil fluid between the housing 7 and the inner hole. Both oil passages are connected to different distribution channels of the motor distribution support plate 10. The improvement is that the motor is a small-displacement motor, and a grooved stepped hole is provided at the end of the motor pressure balance plate 16 that contacts the linkage shaft 20.

[0029] The pressure balance plate has a groove and stepped hole with a depth of 0.8 to 1.8 mm. The size of the groove and stepped hole ensures that the linkage shaft moves flexibly.

[0030] The output displacement of the small displacement motor is less than 100 ml / r, and the stator thickness of the rotor-stator pair 11 of the small displacement motor is less than 10.5 mm.

[0031] The spline ends of the linkage shaft 20 have different lengths. The spline at the inner hole engagement end of the output shaft 1 is longer, while the spline at the inner hole engagement end of the rotor of the rotor-stator pair 11 is shorter. The longer spline end of the linkage shaft 20 is designated as the long spline end, and the shorter spline end is designated as the short spline end. The spline end that engages with the inner spline of the rotor is the short spline end of the linkage shaft 20. Because the pressure balance plate 16 has a grooved stepped hole, the short spline end of the linkage shaft 20 has a larger thickness, ensuring both spline strength and high reliability of heat treatment, thus guaranteeing performance requirements.

[0032] The inner hole of the output shaft 1 of the linkage shaft 20 is machined into a four-segment tooth structure, and the tooth profile of the meshing spline is symmetrical.

[0033] The angle between the four toothed segments of the long spline end of the linkage shaft 20 and the axis is γ, which is close to the line of symmetry and the axis, and β, which is far from the line of symmetry and the axis. The angle γ is 3 to 5° and the angle β is 7 to 9°.

[0034] The angle between the four toothed segments of the short spline end of the linkage shaft 20 and the axis is γ, which is close to the line of symmetry and the axis, and β, which is far from the line of symmetry and the axis. The angle γ is 3 to 5° and the angle β is 7 to 9°.

[0035] The spline tooth angles of the long spline end and the short spline end of the linkage shaft 20 are the same, and the length of the corresponding angle tooth at the long spline end is greater than the length of the corresponding angle tooth at the short spline end.

[0036] Furthermore, the theoretical parameters of the rotor-stator pair 11 of the small displacement motor are: 6 / 7 tooth structure, pin wheel diameter Φ12.65~Φ12.75mm, pin wheel distribution circle diameter Φ78.4~Φ78.7mm, and rotor eccentricity 3~3.1mm.

[0037] Furthermore, the theoretical parameters of the rotor-stator pair 11 of the small displacement motor are: 6 / 7 tooth structure, pin wheel diameter Φ12.7mm, pin wheel distribution circle diameter Φ78.5mm, and rotor eccentricity 3.05mm.

[0038] Furthermore, the output displacement of the small displacement motor is 65ml / r and 80ml / r. The stator thickness of the rotor-stator pair 11 with an output displacement of 65ml / r is 8mm, the stator thickness of the rotor-stator pair 11 with an output displacement of 80ml / r is 9mm, and the stator thickness of the rotor-stator pair 11 with an output displacement of 90ml / r is 10.2mm.

[0039] 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.

[0040] 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 small displacement high speed gerotor hydraulic motor, comprising a body shell with two oil channels, the two oil channels are communicated with the motor oil inlet A and oil return B respectively, one oil channel is connected with the axial hole of the body shell, the cross section of the axial hole is flat hexagonal, the other oil channel is connected with the oil liquid annular cross section channel between the body shell hole, the two oil channels are communicated with different flow channels of the motor, characterized in that: The motor is a small displacement motor, and a grooved stepped hole is provided at one end of the motor pressure balance plate that contacts the linkage shaft; The depth of the stepped hole in the groove of the pressure balance plate is 0.8 to 1.8 mm.

2. The small-displacement high-speed cycloidal hydraulic motor according to claim 1, characterized in that: The output displacement of the small displacement motor is less than 100 ml / r, and the stator thickness of the rotor-stator pair of the small displacement motor is less than 10.5 mm.

3. The small-displacement high-speed cycloidal hydraulic motor according to claim 1, characterized in that: The spline ends at both ends of the linkage shaft are of different lengths; the spline at the meshing end of the inner hole of the output shaft is longer, while the spline at the meshing end of the inner hole of the rotor is shorter.

4. The small-displacement high-speed cycloidal hydraulic motor according to claim 3, characterized in that: The inner hole of the output shaft of the linkage shaft is configured with a four-segment tooth structure, and the tooth profile of the meshing spline is symmetrical.

5. A small-displacement, high-speed cycloidal hydraulic motor according to claim 1, characterized in that: The angle between the four toothed sections of the long spline end of the linkage shaft and the axis is γ, which is close to the line of symmetry and the axis, and β, which is far from the line of symmetry and the axis. The angle γ is 3 to 5° and the angle β is 7 to 9°.

6. The small-displacement high-speed cycloidal hydraulic motor according to claim 1, characterized in that: The angle between the four toothed segments of the short spline end of the linkage shaft and the axis is γ when the segments are close to the line of symmetry, and β when the segments are far from the line of symmetry. The angle γ is 3-5° and the angle β is 7-9°.

7. A small-displacement, high-speed cycloidal hydraulic motor according to claim 1, characterized in that: The spline tooth angles at the long spline end and the short spline end of the linkage shaft are the same, and the corresponding tooth length at the long spline end is greater than the corresponding tooth length at the short spline end.

8. A small-displacement, high-speed cycloidal hydraulic motor according to claim 1, characterized in that: The theoretical parameters of the rotor-stator pair of the small displacement motor are: 6 / 7 tooth structure, pin wheel diameter Φ12.65~Φ12.75mm, pin wheel distribution circle diameter Φ78.4~Φ78.7mm, and rotor eccentricity 3~3.1mm.

9. A small-displacement, high-speed cycloidal hydraulic motor according to claim 1 or 8, characterized in that: The theoretical parameters of the rotor-stator pair of the small displacement motor are: 6 / 7 tooth structure, pin wheel diameter Φ12.7mm, pin wheel distribution circle diameter Φ78.5mm, and rotor eccentricity 3.05mm.

10. A small-displacement, high-speed cycloidal hydraulic motor according to claim 1, characterized in that: The small displacement motor has a discharge displacement of 65ml / r and 80ml / r. The stator thickness of the rotor-stator pair with a discharge displacement of 65ml / r is 8mm, and the stator thickness of the rotor-stator pair with a discharge displacement of 80ml / r is 9mm.

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