Self-lubricating and wear resistant valve/valve guide combination for internal combustion engines
US5819774A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 1996 |
| Grant date | Oct 13, 1998 |
| Priority date | — |
| Expiry date | Aug 28, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/0318
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A self-lubricating and wear resistant valve/valve guide combination for an engine includes a self-lubricating coating deposited on one of (a) the inner surface of the valve guide, or (b) the outer surface of the valve stem. A wear-resistant coating deposited on one of (a) the outer surface of the valve stem when the self-lubricating coating is deposited on the inner surface of the valve guide, or (b) the inner surface of the valve guide when the self-lubricating coating is deposited on the outer surface of the valve stem. The self-lubricating coating has a composition, by weight, consisting essentially of, (a) a first component, comprising, a metal-bonded chromium carbide in the range of about 60% to about 80%, (b) a second component, comprising, a soft noble metal in the range of about 1% to about 20%, and (c) a third component, comprising, a metal fluoride eutectic in the range of about 5 to about 20%. The wear-resistant coating has a composition, by weight, consisting essentially of, (a) chromium in the range of about 20% to about 30%, (b) nickel in the range of about 5% to about 15%, (c) tungsten in the range of about 1% to about 10%, and (d) cobalt in the range of about 50% to…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.