An oil pump rotor assembly

A rotor and assembly technology, applied in the field of oil pump rotor assembly structure, can solve problems such as application limitation, reduction of displacement, meshing impact, etc., achieve extensive practical value, avoid oil trapping, and run smoothly

Active Publication Date: 2020-08-04
重庆红宇精密工业集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is an insurmountable defect in the oil pump of this structure, that is, the radius of curvature of the transition curve between the tooth top and the tooth side of the inner rotor is very small, causing the curvature radius of the transition curve to change too rapidly to form a bulge or a top cut. , the meshing inner rotor transition curve part is easy to wear and cause meshing impact, causing noise
The traditional method is to repair the drum rib or top cut part of the inner rotor to avoid the wear of the transition curve, but it also destroys the continuity of the meshing of the inner and outer rotors, and vibration and noise will occur when the rotor rotates at high speed
On the other hand, when the tooth top of the inner rotor of the oil pump with the above structure rotates to the tooth root of the outer rotor, a closed cavity is formed to trap oil and cause noise, which is unavoidable in traditional rotor pumps, and the closed cavity will also discharge oil Chamber fluid is input into the oil chamber, reducing displacement and reducing efficiency
The above shortcomings limit the application of traditional rotor pumps in hydraulic systems that pay more and more attention to noise

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0025] This embodiment provides an oil pump rotor assembly, which includes an inner rotor 10 and an outer rotor 20 arranged in a rotor cavity of a housing 30.

[0026] The tooth profile line of the inner rotor 10 has a radius of r 3 And the center is the envelope curve C'of a group of trajectory circle I3 on ​​the hypocycloid C. The hypocycloid C is the track of a fixed point M on the circumference of the spheronization circle I1 when the spheronization circle I1 is inscribed to the base circle I2 for rolling without sliding. The radius of the spheronization I1 is r 1 . The radius of the base circle I2 is r 2 .

[0027] The tooth profile line of the outer rotor 20 has a radius of r 7 And the center is the envelope curve D'of a group of trajectory circle II7 on the hypocycloid D. The hypocycloid D is the track of a fixed point N on the circumference of the spheron II5 when the spheron II5 is inscribed to the base circle Ⅱ6 for rolling without sliding. The radius r of the spheroni...

Embodiment 2

[0031] This embodiment provides an oil pump rotor assembly, which includes an inner rotor 10 and an outer rotor 20 arranged in a rotor cavity of a housing 30.

[0032] See figure 1 , The inner rotor 10 and the outer rotor 20 are in conjugate meshing engagement. The inner rotor 10 has 6 teeth, and the outer rotor 20 has 7 teeth. The housing 30 has a suction port for sucking fluid and a discharge port for discharging fluid. The inner rotor 10 and the outer rotor 20 are conjugated with a constant ratio transmission. The center of the inner rotor is O i , The center of the outer rotor is O o , The center distance between the inner rotor 10 and the outer rotor 20 is a.

[0033] See figure 2 The forming process of the tooth profile line of the inner rotor 10 is as follows: the spheronization circle I1 is inscribed to the fixed base circle I2 and performs pure rolling, and the track of a point M on the spheronization circle I1 forms a hypocycloid C. The hypocycloid C is closed, and th...

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Abstract

The invention provides an oil pump rotor assembly. The tooth shapes of an inner rotor and an outer rotor in the oil pump rotor assembly are composed of envelope curves of a hypocycloid formed by a fixed connection point on a rolling circle and circular arcs through the mode that the rolling circle purely rolls along a fixed base circle. According to the oil pump rotor assembly, the tooth shapes ofthe inner rotor and the outer rotor are set through appropriate parameters, the appropriate meshing clearance is set, edge bulging and crest cutting of tooth crests of rotors in a traditional rotor pump are avoided, the problems of tooth crest meshing abrasion, vibration, noise, meshing oil-trapping during working of the traditional rotor pump are effectively solved, meanwhile, the displacement of an oil pump is increased, and the efficiency is improved.

Description

Technical field [0001] The invention relates to the technical field of hydraulic transmission, in particular to an oil pump rotor assembly structure. Background technique [0002] The traditional rotor pump adopts circular arc and cycloid meshing mode to work, including adopting short outer cycloid equidistant curve to form the inner rotor with n (n≥3 natural number) teeth and adopting circular arc to form n+1 teeth The outer rotor, and a housing formed with a suction port for sucking in fluid and a discharge port for discharging fluid. When the oil pump is working, the meshing oil pump rotor assembly rotates, and the fluid is sucked and discharged by changing the volume change formed by the meshing rotor and the housing with the suction port and the discharge port. [0003] The oil pump with the above-mentioned structure has a simple and compact structure, and is widely used in hydraulic transmission systems. In particular, the lubricating oil pumps and automatic transmission oil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04C15/00F04C2/10F16N13/20
Inventor 杨昌林唐春申小刚杨建
Owner 重庆红宇精密工业集团有限公司
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