Low inertia, wear-resistant valve for engine fuel injection systems
US5607106A · kind A · utility
54Cited by
6References
12Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Aug 10, 1994 |
| Grant date | Mar 4, 1997 |
| Priority date | — |
| Expiry date | Aug 10, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S239/19
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A low inertia, wear-resistant needle valve assembly is provided for an internal combustion engine closed nozzle unit fuel injector. The needle valve assembly includes a needle and spring retainer subassembly made from an advanced structural ceramic, such as silicon nitride. A valve seat subassembly in the injector cup is made from a combination of metal and ceramic. The assembly materials and configuration provide maximum control over the efficiency of the injection event so that the fuel injection event can be terminated quickly, thereby allowing more effective control over exhaust emissions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.