Ceramic fuel injector timing plunger
US5899383A · kind A · utility
3Cited by
23References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 20, 1997 |
| Grant date | May 4, 1999 |
| Priority date | — |
| Expiry date | Feb 20, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M57/023
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A wear and scuff-resistant timing plunger for a timing assembly in a unit fuel injector for an internal combustion engine is provided. The timing plunger is formed of a high thermal expansion ceramic with a thermal expansion coefficient greater than 6.times.10.sup.-6 /.degree. C. and a hardness greater than 800 Kg/mm.sup.2, which maintains a desired diametral clearance and efficient plunger function without scuffing or sticking under the axial, tangential and pressure loads encountered in the fuel injector operating environment. Preferred high thermal expansion ceramics are zirconia, alumina-zirconia and alumina.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.