CN-121993397-A - Bidirectional inner-meshing cycloid rotor pump for central pumping oil and application method thereof

CN121993397ACN 121993397 ACN121993397 ACN 121993397ACN-121993397-A

Abstract

The invention provides a bidirectional inner-meshing cycloid rotor pump for pumping oil in a center and a use method thereof, wherein the pump comprises an oil pump shell, an oil pipe, an epicycloidal rotor and a hypocycloid rotor; the oil pump comprises an oil pump shell, an oil pipe, an epicycloidal rotor, a hypocycloidal rotor, a connecting shaft, a central through hole and a plurality of oil cavities, wherein one end of the oil pipe is connected with the first flow passage, the other end of the oil pipe is connected with a lubricating oil storage cavity, the epicycloidal rotor and the hypocycloidal rotor are both connected with the oil pump shell in a rotating mode and are eccentrically arranged, the connecting shaft is provided with the central through hole, one end of the central through hole is communicated with the lubricating oil storage cavity, the other end of the central through hole is communicated with the second flow passage, the hypocycloidal rotor is meshed with the epicycloidal rotor and is in linear sealing connection with the epicycloidal rotor, a plurality of radially isolated oil cavities are formed, the first flow passage is communicated with one oil cavity, and the second flow passage end is communicated with the other oil cavity. The invention can realize the bidirectional rotation of the hypocycloid rotor and the epicycloidal rotor, can realize the oil circulating cooling in the bidirectional rotation process, and widens the application scene of the oil pump.

Inventors

LIU PENGCHENG
WANG HONGJIAN
ZHANG FENGHUA

Assignees

中国航空工业集团公司北京航空精密机械研究所

Dates

Publication Date: 20260508
Application Date: 20260210

Claims (10)

1. A bi-directional intermeshing gerotor pump for pumping oil in a center, comprising: an oil pump housing having a first flow passage and a second flow passage; One end of the oil pipe is connected with the first flow channel, and the other end of the oil pipe is connected with a lubricating oil storage cavity of the reduction gearbox; An epicycloidal rotor rotatably connected to the oil pump housing, the epicycloidal rotor having N first gear teeth; The hypocycloid rotor is rotationally connected to the oil pump shell, the rotation center of the hypocycloid rotor and the rotation center of the hypocycloid rotor are eccentrically arranged, the hypocycloid rotor is provided with N-1 second gear teeth, the hypocycloid rotor is provided with a connecting shaft connected with the input end of the reduction gearbox, the center of the connecting shaft is provided with a center through hole, one end of the center through hole is communicated with a lubricating oil storage cavity of the reduction gearbox, the other end of the center through hole is communicated with a second flow passage, the hypocycloid rotor is in meshed connection with the hypocycloid rotor, a plurality of radially isolated oil cavities are formed in a linear sealing mode, one end of the first flow passage deviating from the oil pipe is communicated with one of the oil cavities, and one end of the second flow passage deviating from the center through hole is communicated with the other oil cavity.
2. The bi-directional, inner-intermeshing gerotor pump of claim 1, further comprising an open needle bearing and an outer rotor sleeve, wherein an outer race of the open needle bearing is coupled to the oil pump housing, an inner race of the open needle bearing is coupled to the outer rotor sleeve, the outer rotor sleeve has an eccentric receiving cavity, and the epicycloidal rotor is rotatably coupled within the eccentric receiving cavity.
3. The bi-directional inner gearing gerotor pump of claim 2, wherein a distance between a cross-sectional center of the outer rotor sleeve and a cross-sectional center of the eccentric receiving cavity is equal to a meshing eccentric distance of the epicycloidal rotor and the hypocycloidal rotor.
4. The bi-directional inner gearing gerotor pump of claim 2, wherein the inner wall surface of the eccentric receiving chamber is provided with at least one oil storage hole.
5. The center pumping bi-directional intermeshing gerotor pump of claim 1, further comprising a lip seal, the first flow passage having a first flow passage opening, the lip seal sealingly connecting the first flow passage opening with the oil line.
6. The center pumping bi-directional intermeshing gerotor pump of claim 1, further comprising an oil pump shim plate disposed between the oil pump housing and the epicycloidal rotor and the hypocycloidal rotor.
7. The bi-directional inner gearing gerotor pump of claim 1, further comprising a drive shaft stator, wherein the drive shaft stator is connected to the oil pump housing, wherein the drive shaft stator and the oil pump housing enclose a receiving cavity, wherein the epicycloidal rotor and the hypocycloidal rotor are disposed in the receiving cavity, and wherein the drive shaft stator is further provided with a hole through which the connecting shaft passes out of the receiving cavity.
8. The center pump oil bidirectional inner meshing cycloidal rotor pump according to claim 1, further comprising an oil pipe plug, wherein the oil pump housing is provided with a first maintenance channel, one end of the first maintenance channel is communicated with the first flow channel, and the other end of the first maintenance channel is provided with the oil pipe plug.
9. The center pumping bi-directional intermeshing gerotor pump of claim 1, further comprising an oil pump housing plug, wherein the oil pump housing defines a second service passage, wherein one end of the second service passage is in communication with the second flow passage, and wherein the other end of the second service passage is provided with the oil pump housing plug.
10. A method of using the bi-directional intermeshing gerotor pump of a center pump oil of any one of claims 1-9, comprising the steps of: The input end of the reduction gearbox drives the connecting shaft to rotate anticlockwise, so that the epicycloidal rotor and the hypocycloidal rotor are driven to rotate anticlockwise, lubricating oil is sucked into the oil cavity from the reduction gearbox through the oil pipe and the first flow channel, and after rotating, the lubricating oil moves into the other oil cavity and enters the central through hole of the connecting shaft through the second flow channel to be output into the reduction gearbox, so that the oil circulation cooling is realized; Or the input end of the reduction gearbox drives the connecting shaft to rotate clockwise, so that the epicycloidal rotor and the hypocycloidal rotor are driven to rotate clockwise, lubricating oil is sucked into the oil cavity from the reduction gearbox through the central through hole and the second flow passage, and after rotation, the lubricating oil moves into the other oil cavity, enters the oil pipe through the first flow passage, and is output into the reduction gearbox from the oil pipe, so that oil circulating cooling is realized.

Description

Bidirectional inner-meshing cycloid rotor pump for central pumping oil and application method thereof Technical Field The invention relates to the technical field of hydraulic transmission, in particular to a bidirectional internal meshing cycloid rotor pump with central pumping oil and a use method thereof. Background The hydraulic pump is a device for converting input mechanical energy into output hydraulic energy by means of oil suction and discharge realized by the change of the volume of a sealed working space. Currently, general gear pumps on the market can be classified into screw pumps, external gear pumps and internal gear pumps according to the engagement mode, wherein the internal gear pumps can be classified into involute internal gear pumps and cycloid rotor pumps according to tooth shapes. The working principle of the cycloid rotor pump is that two oil cavities are formed by linear sealing between a hypocycloid rotor and an epicycloidal rotor. A low-pressure chamber serves as an oil suction chamber for sucking lubricating oil. A high-pressure chamber serves as a pressure oil chamber for discharging lubricating oil. The cycloid rotor pump has the advantages of small volume, high rotating speed and small noise in the motion process. Because of the eccentric installation and engagement of the inner cycloid rotor and the outer cycloid rotor, most cycloid rotor pumps in the current market are installed eccentrically, and oil inlet and outlet ports are arranged on two side surfaces of the pump body, so that the pump body can only work unidirectionally and cannot adapt to bidirectional rotation scenes (such as a reversible transmission system), and the application range is limited. The eccentric structure leads to the pump body quality great, and the side direction arrangement of oil inlet and outlet has increased the pipeline complexity, is unfavorable for compact design. Disclosure of Invention First, the technical problem to be solved The invention aims to solve the technical problems that the cycloid rotor pump in the prior market is mostly eccentrically installed, the oil inlet and the oil outlet are mostly arranged on two side surfaces of the pump body, the pump body can only rotate unidirectionally, the oil inlet and the oil outlet are fixed, and the pump body has larger mass. (II) technical scheme In order to achieve the above purpose, the invention adopts the following technical scheme: The invention provides a bidirectional inner-meshing cycloid rotor pump with central pumping oil, which comprises an oil pump shell, an oil pipe, an outer cycloid rotor and a inner cycloid rotor, wherein the oil pump shell is provided with a first flow passage and a second flow passage, one end of the oil pipe is connected with the first flow passage, the other end of the oil pipe is connected with a lubricating oil storage cavity of a reduction box, the outer cycloid rotor is rotationally connected with the oil pump shell and is provided with N first gear teeth, the inner cycloid rotor is rotationally connected with the oil pump shell, the rotation center of the outer cycloid rotor is eccentrically arranged with the rotation center of the inner cycloid rotor, the inner cycloid rotor is provided with N-1 second gear teeth, the inner cycloid rotor is provided with a connecting shaft connected with the input end of the reduction box, the center through hole is arranged in the center of the connecting shaft, one end of the center through hole is communicated with a lubricating oil storage cavity of the reduction box, the other end of the center through hole is communicated with the second flow passage, the inner cycloid rotor is meshed with the outer cycloid rotor and is sealed by a plurality of radially-isolated oil cavities, the first flow passages are formed in a line, the second flow passage is communicated with one end of the oil cavities, which is far away from the center through hole, and one end of the oil cavity is communicated with the other end. According to the technical scheme, the pump can stably work under clockwise and anticlockwise rotation, the unidirectional limitation of the traditional cycloid rotor pump is broken through, the pump is applicable to a reversible transmission system (such as a wind power variable pitch system), and the application scene is widened. The central through hole is used as an oil pumping path, so that the flowing distance of oil is shortened, the pressure loss is reduced, and the circulation efficiency of lubricating oil is improved. The rotor and the runner which are coaxially arranged are integrated, so that the volume of the pump body is reduced, the weight is reduced, and the pump body is easier to integrate into a compact space. Preferably, the oil pump further comprises an open type needle bearing and an outer rotor sleeve, wherein an outer ring of the open type needle bearing is connected with the oil pump shell, an inner ring of the open type needle bearing