Oil supply system in internal conbustion engine
US5195474A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 13, 1992 |
| Grant date | Mar 23, 1993 |
| Priority date | — |
| Expiry date | Mar 13, 2012 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01M2001/123
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In an internal combustion engine comprising a valve operating device which is disposed in a cylinder head coupled to an upper surface of a cylinder block and which includes a valve operating cam shaft connected to a crank shaft rotatably carried in a lower engine body portion including the cylinder block, and valve operation characteristic changing means for changing, in accordance with a variation in hydraulic pressure in a hydraulic pressure chamber, the operation characteristics of an engine valve which is supported in the cylinder head for opening and closing, a lower oil supply system and an upper oil supply system are disposed independently of each other. The lower oil supply system is comprised of a first oil pump connected to individual oil consumption parts disposed in a lower engine body portion for supplying a first oil, and the upper oil supply system is comprised of a second oil pump connected to individual oil consumption parts included in the valve operating device as well as to the hydraulic pressure chamber for supplying a second oil. This ensures that the second oil pump can be disposed in proximity to the hydraulic pressure chamber, so that an oil having a charac…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.