Oil pump rotor having a generated cycloid curve
US5876193A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 15, 1997 |
| Grant date | Mar 2, 1999 |
| Priority date | — |
| Expiry date | Jan 15, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C2/102
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to an oil pump rotor provided with an inner rotor 10 to which n (n is a natural number) outer teeth 11 are formed, an outer rotor 20 to which n+1 inner teeth 21 are formed which engage with each of the outer teeth 11, and a casing 30 in which an intake port 31 for taking up fluid and an expulsion port 32 for expelling fluid are formed, wherein: the outer teeth of inner rotor are formed by alternately combining an epicycloid curve and a hypocycloid curve, the epicycloid curve being generated as an orbit of the point on a circle which rolls along the outside of the base circle without slipping, and the hypocycloid curve being generated as an orbit of a point on a circle which rolls along the inside of the base circle without slipping; the alternately combined curve being generated under the following condition, where E is the diameter of the circle which rolls along the outside of the base circle, and H is the diameter of the circle which rolls along the inside of the base circle: EQU 0.5.ltoreq.H/E.ltoreq.0.8.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.