Trochoidal toothed oil pump with thin discharge channel communicating with discharge chamber
US4767296A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 31, 1987 |
| Grant date | Aug 30, 1988 |
| Priority date | — |
| Expiry date | Mar 31, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C15/0049
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A trochoidal oil pump including a housing defining an internal space; an outer rotor fitted rotatably in the internal space of the housing and having internal teeth; an inner rotor having outer teeth meshing with the internal teeth of the outer rotor to define a sealed space therebetween; and suction and discharge chambers formed in the housing and opened into the internal space of the same. The discharge member is formed to begin at an angle l formed in the direction of forward rotation from the dedendum to the beginning portion of the discharge chamber extending in the direction of forward rotation and defined by the following relationship: EQU l.sub.1 <l.ltoreq.70.degree., where l.sub.1, designates an angle taken in the direction of rotation from the dedendum of the inner rotor to the contact position, in which the outer rotor and the inner rotor have their addendums contacting at first, at the maximum volume of the sealed space. A thin channel communicating with the discharge chamber is so formed in the housing as to extend in a reverse direction of rotation from the position of the angle l.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.