Valve stem seal
US4198062A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 1, 1978 |
| Grant date | Apr 15, 1980 |
| Priority date | — |
| Expiry date | Sep 1, 1998 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L3/08
- WIPO fieldEngines, pumps, turbines
- 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 is formed of a relatively rigid valve seal body having a cylindrical wall or skirt engaging the valve guide boss and an upper radially inwardly offset cylindrical wall of a smaller diameter with a radially inwardly extending flange having metering grooves on the upper and lower surfaces thereof, and a resilient insert or collar is positioned on the flange to sealingly engage the reciprocating valve stem; the motion of the collar during reciprocation of the valve stem providing a pumping action through the metering grooves.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.