Internal combustion engine for vehicles in particular, for motorcycles
US4532897A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 11, 1984 |
| Grant date | Aug 6, 1985 |
| Priority date | — |
| Expiry date | Jun 11, 2004 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02B61/02
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The crankshaft of an internal combustion engine for vehicles, especially motorcycles, is mounted between upper and lower parts of a crankcase. The crank webs of the shaft rotate partially in the lower part which is in the form of an oil space. An oil sump is also provided in the lower part at a lower level than the oil space. The lower part of the crankcase has a curved floor formed at a distance from the crank webs, and such floor has one or more oil return ducts therein. The ducts are disposed in the vicinity of the path of movement of the crank webs. The ducts are, in fact, opposite the crank webs and each of the ducts have a slope to them. Each of the ducts extend between walls of bearing seats provided in the engine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.