Oil pump device of an engine
US4974562A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 1989 |
| Grant date | Dec 4, 1990 |
| Priority date | — |
| Expiry date | Dec 15, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02B2075/027
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A lubricating oil pump device of an engine comprises an upper and a lower pump case and a rotary pumping mechanism of the internal-gear, one-tooth difference type housed within a housing formed between the upper and lower pump cases. Both the pump cases have oil reserving oil sumps formed therein, thereby to reserve some oil in the pump device even when the engine is stopped for a long period. Then, when the engine is restarted and the pumping mechanism operates, the oil thus reserved in the oil sumps is contacted by the moving pumping mechanism and is induced out to form oil films on the surfaces of the pump cases and of the pumping mechanism. Thus instant lubrication and sealing for effective suction are assured.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.