Low inertia, wear-resistant valve for engine fuel injection systems
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United States of America Patent
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Mar 4, 1997
Grant Date -
N/A
app pub date -
Aug 10, 1994
filing date -
Aug 10, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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