Sliding stem seal, particularly for valve stems
US4993379A · kind A · utility
13Cited by
1References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 2, 1989 |
| Grant date | Feb 19, 1991 |
| Priority date | — |
| Expiry date | Nov 2, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16J15/324
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A seal for the stem of an internal combustion engine intake or exhaust valve; which seal presents a first portion mounted integral with an element supporting the stem; and a second portion inside which are formed two annular lips cooperating in contacting manner with the stem and defining, together and with the stem, an annular chamber inside which part of the lubricating oil supplied when the engine is running is trapped when the engine is idle, thus preventing the sealing lips from drying and sticking to the valve stem.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.