초록 ▼

A high pressure gaseous fuel injector for injecting natural gas or other gaseous fuels at high pressures (eg. 300 to 700 psig more or less) into combustion engines for improved efficiency, better performance and reduced environmental emissions. The fuel injector is powered by hydraulic signals from

A high pressure gaseous fuel injector for injecting natural gas or other gaseous fuels at high pressures (eg. 300 to 700 psig more or less) into combustion engines for improved efficiency, better performance and reduced environmental emissions. The fuel injector is powered by hydraulic signals from an electrohydraulic valve. The fuel injector includes an outer cartridge housing and a universal valve cartridge mounted therein. The cartridge comprises an activator body and a valve body secured together, and the valve body has a gas valve slidable therein. The stroke of the valve is adjustable by controlling the size of shims in the valve body assembly, thereby providing a universal valve cartridge that can be easily adapted to differing fueling requirements for models and sizes of engines. The valve body includes a spring chamber between upper and lower valve guides. The valve body also includes cross-holes to allow cool gaseous fuel to successively pulsate into and out of the spring chamber and thereby cool the exposed portion of the valve between guides, preventing heating of the dynamic gas seal located in the upper guide. An unsealed small clearance between the actuating piston and its bore in the actuator body allows controlled leakage of oil. The leakage of oil lubricates metal to metal contact between the upper guide and the valve and lubricates the dynamic gas seal. Gaseous fuel leakage into the leaked oil is tolerated and any combined oil/gaseous fuel is removed to an external location for separation. Spring washers are used to urge the valve assembly insert against a metal O-ring supported by the outer cartridge body.

대표청구항 ▼

1. A fuel injector for injecting gaseous fuel into an engine, comprising:a tubular cartridge housing; a valve body in the cartridge housing, including 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; a

1. A fuel injector for injecting gaseous fuel into an engine, comprising:a tubular cartridge housing; a valve body in the cartridge housing, including 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; a gas passageway generally between the cartridge housing and the valve body for communicating gaseous fuel to the engine through an outlet port; an elongate valve retained by the guide collars, having an exposed surface in the cooling chamber, the valve being slidable between open and closed positions to open and close the outlet port, respectively; at least one cooling port defined in the sleeve connecting the gas passageway to the cooling chamber, the at least one cooling port located between the upper and lower guide collars communicating with the cooling chamber adapted to communicate gaseous fuel into and out of the cooling chamber, located for cooling the exposed surface of the valve; and a gas seal carried by the valve body engaging the elongate valve, the cooling chamber located between the outlet port and the gas seal such that heat traveling through the elongate valve from the outlet port is cooled by the cooling chamber prior to reaching the gas seal.