Oil return to the sump of a flat engine
US9309793B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 4, 2014 |
| Grant date | Apr 12, 2016 |
| Priority date | — |
| Expiry date | Feb 4, 2034 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02B75/282
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Returning engine oil to the primary oil sump from outboard locations in a flat engine can be a challenge. In the present disclosure, the pressure fluctuations occurring at the underside of the piston, due to reciprocation of the piston, are used to pump the oil from outboard locations to the primary oil sump. To prevent backflow of oil during periods of negative pressure difference, a check valve is placed in the oil drain passage. The check valve allows flow from the outboard location to the primary oil sump and no flow from the primary oil sump to the outboard location by opening and closing as driven by pressure fluctuations due to piston reciprocation. Such a check valve also prevents backflow of the oil to one of the outboard locations when the engine is tilted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.