Valve stem seal
US4125265A · kind A · utility
14Cited by
12References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 6, 1977 |
| Grant date | Nov 14, 1978 |
| Priority date | — |
| Expiry date | Jul 6, 1997 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16J15/3244
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A valve stem seal for an intake or exhaust valve in an internal combustion engine where the seal allows a metered amount of oil to run down the valve stem for lubrication of the stem in its valve guide. The seal has a cylindrical wall engaging the valve guide boss and an upper inwardly extendng flange provided with twin sealing lobes on the internal surface separated by an annular groove; the lobes and groove providing a pumping action for oil during reciprocation of the valve stem.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.