Axial flow distribution cycloid hydraulic motor

Abstract

The utility model relates to an axial flow distribution cycloid hydraulic motor, and belongs to the technical field of hydraulic transmission. Comprising a motor positioning installation driving part and a motor body meshing pair part, a motor body shell is integrally provided with a positioning spigot, a motor oil inlet and a motor oil outlet, two one-way valves are arranged in the rear portion of the body shell, and most of the meshing portion of an output shaft internal spline is far away from a front ring groove portion. The tooth form of the involute spline of the linkage shaft is formed by combining a plurality of sections at different angles. The utility model has the advantages of compact structure, short axial dimension, simple integral structure, good manufacturability, and good assembly and maintenance manufacturability.

Description

Technical Field

[0001] The utility model relates to a cycloid hydraulic motor for converting hydraulic energy into mechanical energy, in particular to an axial flow distribution cycloid hydraulic motor, belonging to the technical field of hydraulic transmission. Background Art

[0002] The cycloid hydraulic motor is a relatively commonly used hydraulic drive device. It is a low-speed, high-torque motor with the advantages of small size, high unit power density, high efficiency, and a wide speed range. It has been widely used and will be more widely used as my country's industrial and agricultural development level continues to improve.

[0003] The basic structure of this type of device is that the body shell or rear cover is provided with a liquid inlet and a reflux port, and a cycloidal pinwheel meshing pair and a flow distribution mechanism are installed at one end. The flow distribution mechanism can be set in front of or behind the cycloidal pinwheel meshing pair. Generally, the front (body shell side) is an axial valve flow distribution, and the flow distribution system circular surface is axially arranged, and the rear (rear cover side) is a plane flow distribution, and the flow distribution system plane is radially arranged. The output shaft is installed at the other end. The rotor of the cycloidal pinwheel meshing pair meshes with the external teeth at one end of the linkage shaft through the internal spline, and the other end of the linkage shaft is connected to the output shaft. When working, the flow distribution mechanism connects the liquid inlet with the expansion meshing cavity of the cycloidal pinwheel pair, and connects the contraction cavity of the cycloidal pinwheel pair with the reflux port. As a result, after the pressure liquid enters the body shell or the back cover from the liquid inlet, it enters the expansion meshing cavity formed by the cycloidal pinwheel meshing pair, causing its volume to expand continuously, while the liquid in the contraction meshing cavity formed by the cycloidal pinwheel meshing pair flows back from the reflux port; in this process, the rotor of the cycloidal pinwheel meshing pair is driven to rotate by the pressure difference between the expansion meshing cavity and the contraction meshing cavity, and this rotation is transmitted to the output shaft through the linkage shaft, thereby realizing the conversion of hydraulic energy into mechanical energy. At the same time, the flow distribution mechanism is also driven to rotate synchronously by the linkage shaft, and the connection state of the flow distribution mechanism is switched repeatedly, so that the conversion process can continue. In this way, the motor can continuously output torque. It can be said that the cycloidal pinwheel meshing pair and the flow distribution mechanism are the core of the cycloidal hydraulic motor.

[0004] According to the applicant's understanding, the existing shaft-distributed cycloid hydraulic motor body shell has a front cover structure (as shown in patent document CN215949724 U), the front cover is fixed to the body shell by screws, the installation stop is set on the front cover, and two one-way valves are set at the front end of the body shell close to the front cover end; in addition, the integral body shell structure (as shown in patent document CN 204283724 U), the installation stop is integrated into the body shell, and the shuttle valve composed of one-way valves is set at the installation stop at the front end of the body shell, and the body shell has a casting flow channel that is the same as the oil port. The former increases the sealing surface and reduces the sealing reliability of the motor, while the latter increases the difficulty of casting and may affect the cleanliness of the body shell. Both structures have certain deficiencies. Summary of the invention

[0005] Based on this, it is necessary to redesign the structure of the axial flow cycloid hydraulic motor.

[0006] The above purpose is achieved through the following implementation methods:

[0007] The utility model discloses a shaft-distributed cycloid hydraulic motor, comprising two major parts: a motor positioning and installing driving part and a motor main body meshing pair part. The improvement lies in that: the motor positioning and installing driving part is mainly provided with a body shell, an output shaft and a linkage shaft; the body shell is integrated with a positioning stop and an oil inlet and an oil outlet of the motor; two one-way valves are provided inside the body shell; the one-way valves are provided at the rear of the body shell and are communicated with the oil inlet and the oil outlet respectively; the oil inlet and the oil outlet are communicated with the annular groove of the output shaft respectively.

[0008] One of the oil inlet and the oil outlet is directly communicated with the front ring groove of the output shaft, and the other of the oil inlet and the oil outlet is indirectly communicated with the rear ring groove of the output shaft. The rear ring groove of the output shaft communicates with the axially arranged flow channel hole through a hole channel of the body shell meshing hole wall, and the other of the oil inlet and the oil outlet is communicated with the flow channel hole.

[0009] The flow channel hole is sealed by a plug, and the plug is against the connecting plate.

[0010] The one-way valve is respectively arranged between two mounting bolt holes at the rear of the body shell, and is composed of a valve seat, a steel ball and a sealing ring. The sealing ring seals between the valve seat and the mounting hole in the body shell.

[0011] The one-way valves are respectively against the connecting plates, and the connecting plates are provided with two partially radial liquid flow grooves which are respectively communicated with the one-way valve holes.

[0012] The meshing position of the spline in the output shaft is mostly away from the front ring groove position.

[0013] The involute spline tooth profile of the linkage shaft meshing with the output shaft adopts a combination of multiple sections with different angles. The spline tooth profile adopts an arc transition at the tooth profile center, a small angle tooth profile is adopted near the center, and a large angle tooth profile is adopted far from the center.

[0014] Thus, the shaft-distribution cycloid hydraulic motor of the utility model has a compact structure, good processability and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of the first embodiment of the present utility model.

[0016] In the figure, output shaft 1, key 2, dust ring 3, shaft seal 4, body shell 5, plug 6, sealing ring 7, steel ball 8, valve seat 9, O-ring 10, connecting plate 11, O-ring 12, rotor and stator pair 13, rear cover 14, leakage screw plug 15, sealing gasket 16, gasket 17, connecting bolt 18, linkage shaft 19, oil port cover 20, plane bearing 21, bearing retaining ring 22, and O-ring 23.

[0017] Figure 2 This is the first embodiment of the utility model Figure 1 Posterior view of the body shell of Sequence 5.

[0018] Figure 3 This is the first embodiment of the utility model Figure 1 Schematic diagram of the cross-sectional structure of No. 19.

[0019] Figure 4 This is the first embodiment of the utility model Figure 1 Schematic diagram of the oil port surface of the 5 body shell. DETAILED DESCRIPTION Example

[0020] The structural schematic diagram of a shaft-distributed cycloid hydraulic motor of this embodiment is as follows: Figure 1 As shown, it includes two major parts: a motor positioning and installing driving part and a motor main body meshing sub-part. The motor positioning and installing driving part is mainly provided with a body shell 5, an output shaft 1 and a linkage shaft 19. The body shell 5 integrates the installation positioning stop and the motor oil inlet and oil outlet. Two one-way valves are arranged inside the body shell 5. The one-way valve is arranged at the rear of the body shell 5, close to one end of the connecting plate 11, and communicates with the oil inlet and the oil outlet respectively. The oil inlet and the oil outlet are communicated with the annular groove of the output shaft 1 respectively.

[0021] The motor body meshing pair is mainly composed of a connecting plate 11, a rotor-stator pair 13 and a rear cover 14, which are fixedly connected by connecting bolts 18. The rotor-stator pair 13 is composed of a rotor, pin teeth and a stator to form a column-shaped structure, or a rotor and a stator to form an integral structure, which is a torque generator of a cycloid hydraulic motor.

[0022] The shaft diameters of the body shell 5 and the output shaft 1 of the motor positioning and mounting driving part are meshed, and the meshing hole of the body shell 5 is provided with a radial distribution hole with the number of needle teeth and the meshing shaft diameter of the output shaft 1 is provided with a radial distribution groove with twice the number of rotor teeth, forming an associated distribution relationship, so as to maintain the continuous distribution movement of the motor. A shaft seal 4, a plane bearing 21 and a bearing retaining ring 22 are provided between the inner hole of the body shell 5 and the shaft diameter of the output shaft 1. The shaft seal 4 is provided in the step hole of the body shell 5, and the shaft seal 4 seals the rotating seal of the output shaft 1, while the bearing retaining ring 22 abuts against the step hole surface of the body shell 5. The bearing retaining ring 22 and the plane bearing 21 work together to axially limit the distribution meshing shaft diameter of the output shaft 1, and the other end of the distribution meshing shaft diameter abuts against the connecting plate 11.

[0023] One of the oil inlet and the oil outlet is directly connected to the front ring groove of the output shaft 1, and the other one is indirectly connected to the rear ring groove of the output shaft 1. The end close to the mounting stop is the front ring groove. The rear ring groove of the output shaft 1 is connected to the axially arranged flow channel hole through a hole in the body shell 5 meshing hole wall. The other one of the oil inlet and the oil outlet is connected to the flow channel hole. The flow channel hole is sealed with a plug 6. The plug 6 is against the connecting plate 11. The plug increases the sealing reliability. At the same time, the plug 6 and the mounting hole are sealed with a sealing ring 7. Figure 2 As shown, the flow channel hole is arranged between two mounting bolt holes at the rear of the body shell 5.

[0024] The one-way valves are respectively arranged between two mounting bolt holes at the rear of the housing 5. Figure 2 As shown, the one-way valve is composed of a valve seat 9, a steel ball 8 and an O-ring 10 sealing ring, and the O-ring 10 sealing ring seals between the valve seat 9 and the mounting hole in the body shell 5. Any one-way valve communicates with the oil inlet and the oil outlet provided in the body shell 5 respectively.

[0025] The one-way valves are respectively against the connecting plate 11, and the connecting plate 11 is provided with two partially radial liquid flow grooves respectively communicating with the one-way valve holes, so that the liquid flow in the inner cavity of the motor can enter the motor oil outlet through the one-way valve.

[0026] Most of the meshing parts of the splines in the output shaft 1 are far away from the front ring groove, and its structural design is conducive to improving the strength of the spline meshing.

[0027] The involute spline tooth profile of the linkage shaft 19 meshing with the output shaft 1 is a combination of multiple sections with different angles, such as Figure 3 As shown, the spline tooth profile adopts a transition of arc R at the center of the tooth profile, a small angle α tooth profile is adopted near the center, and a large angle β tooth profile is adopted far from the center. The spline tooth profiles at both ends are of the same shape with respect to the center of the tooth profile. When the tooth profile at one end is shorter, the large angle β tooth profile part at the short tooth profile end is allowed to be cancelled.

[0028] like Figure 4 As shown, the body shell 5 is provided with an oil inlet and an oil outlet, wherein the oil inlet refers to the oil port communicating with the high-pressure oil, and the oil outlet refers to the oil port communicating with the oil in the oil tank, which refers to the two states of the oil port when the motor is in use.

[0029] The above-mentioned embodiment only expresses one implementation method of the utility model, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A shaft-distributed cycloid hydraulic motor, comprising a motor positioning and mounting drive part and a motor body meshing pair part, characterized in that: The motor positioning and installation driving part mainly includes a body shell, an output shaft and a linkage shaft. The body shell integrates the positioning stop and the motor oil inlet and outlet. Two one-way valves are arranged inside the body shell. The one-way valves are arranged at the rear of the body shell and communicate with the oil inlet and the oil outlet respectively. The oil inlet and the oil outlet are communicated with the annular groove of the output shaft respectively.

2. The shaft-distributed cycloid hydraulic motor according to claim 1, characterized in that: One of the oil inlet and the oil outlet is directly communicated with the front ring groove of the output shaft, and the other of the oil inlet and the oil outlet is indirectly communicated with the rear ring groove of the output shaft. The rear ring groove of the output shaft communicates with the axially arranged flow channel hole through a hole channel of the body shell meshing hole wall, and the other of the oil inlet and the oil outlet is communicated with the flow channel hole.

3. The shaft-distributed cycloid hydraulic motor according to claim 2, characterized in that: The flow channel hole is sealed by a plug, the plug is against the connecting plate, and the flow channel hole is arranged between two mounting bolt holes at the rear of the body shell.

4. The shaft-distributed cycloid hydraulic motor according to claim 1, characterized in that: The one-way valve is respectively arranged between two mounting bolt holes at the rear of the body shell, and is composed of a valve seat, a steel ball and a sealing ring. The sealing ring seals between the valve seat and the mounting hole in the body shell.

5. The shaft-distributed cycloid hydraulic motor according to claim 1, characterized in that: The one-way valves are respectively against the connecting plates, and the connecting plates are provided with two partially radial liquid flow grooves which are respectively communicated with the one-way valve holes.

6. The shaft-distributed cycloid hydraulic motor according to claim 2, characterized in that: The meshing position of the spline in the output shaft is mostly away from the front ring groove position.

7. The shaft-distributed cycloid hydraulic motor according to claim 1, characterized in that: The involute spline tooth profile of the linkage shaft meshing with the output shaft adopts a combination of multiple sections with different angles. The spline tooth profile adopts an arc transition at the tooth profile center, a small angle tooth profile is adopted near the center, and a large angle tooth profile is adopted far from the center.

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