Patent ID: 6425532
Filing Date: 2002-07-30
Classification: F02M,Y02T

Abstract:
A fuel injector comprising:a tubular cartridge housing for injecting gaseous fuel into an engine; a fuel injector cartridge inserted into the cartridge housing, the cartridge having a tubular cartridge body; a gas passageway generally between the cartridge body and the cartridge housing for communicating gaseous fuel to the engine through an outlet port; an elongate valve slidably retained in the cartridge body, the valve being linearly movable between open and closed positions to open and close the outlet port; a metal O-ring axially compressed between the tubular cartridge housing and the cartridge body; a spring mechanism urging the cartridge body axially against the tubular cartridge housing compressing the metal O-ring therebetween and providing a seal between the tubular cartridge body and the cartridge housing; and wherein the cartridge body includes a sleeve, and upper and lower guide collars in the sleeve, the upper and lower guide collars being spaced apart and separated by a cooling chamber, and further comprising at least one cooling port defined in the sleeve adapted to communicate gaseous fuel into and out of the cooling chamber for cooling the exposed surface of the valve.