Ellipse-arc compound cycloidal rotor oil pump and its rotor and rotor design method

Abstract

The invention discloses an ellipse-arc compound cycloidal rotor oil pump and its rotor, which comprises an inner rotor and an outer rotor meshing with each other, the number of teeth of the outer rotor is one more than that of the inner rotor, and the tooth profile of each tooth of the outer rotor is It consists of an elliptical arc and a circular arc tangent to the elliptical arc. The arc length of the elliptical arc is from the tooth apex A to the compound point F of the ellipse-circle arc. The arc length of the arc is from the compound point F of the ellipse-circle arc to the tooth The tooth profile of each tooth of the inner rotor is the full conjugate curve of the tooth profile of the outer rotor, and the inner and outer rotors are meshed with a single tooth. At the same time, it also provides the design method of this kind of oil pump rotor, which overcomes the problem of large tooth profile slippage at the meshing boundary point, and solves the problem that the outer rotor of the current elliptic arc cycloid rotor oil pump only participates in part of the tooth profile segment. Meshing, and the problem of meshing impact that is prone to occur, has the advantages of small meshing wear between the inner and outer rotors, good sealing performance, and high volumetric efficiency of the oil pump.

Description

technical field [0001] The invention belongs to the technical field of oil pumps, and in particular relates to an ellipse-arc composite cycloidal rotor oil pump, a rotor thereof, and a design method of the rotor. Background technique [0002] At present, the commonly used oil pump types include gear type and cycloid rotor type. Cycloidal rotor oil pumps can be divided into single tooth difference and multi-tooth difference according to the difference in the number of teeth, and can be divided into arc cycloid rotor oil pumps, elliptic arc cycloid rotor oil pumps and double cycloid rotor oil pumps according to the outer rotor line shape. In the single-tooth difference oil pump, if the number of teeth of the inner rotor is n, the number of teeth of the outer rotor is n+1. The meshing between the inner and outer rotors forms n+1 areas, and the volume of these n+1 areas changes from large to small, and from small to large, to complete oil absorption and oil discharge. [0003]...

AI Technical Summary

Problems solved by technology

[0004] At the same time, if figure 2 As shown in the prior art, the tooth profile slip ratio of the inner and outer rotors of the elliptic arc cycloid rotor oil pump in the prior art has a maximum value, and a large tooth profile slip is prone to occur, and severe wear is prone to occur during the meshing process of the inner and outer rotors

[0005] When the inner and outer rotors mesh near the meshing boundary point B of the outer rotor, the wear is more serious than other meshing points, and in extreme cases, the rotors will fail and the transmission cannot be meshed normally.

If the wear of the oil pump rotor is not improved, the meshing gap between the inner and outer rotors will increase, the amount of oil leakage will increase, the amount of oil delivered by the oil pump will continue to decrease, and the volumetric efficiency will decrease, which will affect the service life of engine parts

In addition, when the tooth profile of the inner and outer rotors is damaged due to wear, the meshing transmission of the inner and outer rotors cannot meet the requirements of the meshing principle, and continuous transmission will have meshing shocks and speed fluctuations, which will also increase the noise of the oil pump.

If people work and live near high-noise environments for a long time, they will feel tired, irritable and inattentive, which will cause a series of symptoms such as slow brain response, which will affect work efficiency and quality of life.

[0006] Although there are many problems in multi-tooth meshing, due to the low machining accuracy of oil pump manufacturers in the past, in order to meet the requirements of oil flow, multi-tooth meshing is still used when designing the transmission between the inner and outer rotors, and no single-tooth meshing technology has been studied.

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