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. An unsealed small clearance between the actuating piston and its bore in the cartridge 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.

대표청구항 ▼

1. A fuel injector for injecting gaseous fuel into a cylinder of an engine, the fuel injector adapted to be driven by hydraulic signals of a hydraulic fluid, comprising:a support housing having a gas passageway therein for communicating gaseous fuel to the cylinder of the engine; a piston mounted in

1. A fuel injector for injecting gaseous fuel into a cylinder of an engine, the fuel injector adapted to be driven by hydraulic signals of a hydraulic fluid, comprising:a support housing having a gas passageway therein for communicating gaseous fuel to the cylinder of the engine; a piston mounted in a piston control chamber actuated by the hydraulic signals; a valve in the housing driven by the piston between open and closed positions corresponding with opening and closing the gas passageway to the cylinder of the engine; a collection chamber in the support housing, hydraulic fluid adapted to leak past the piston into the collection chamber, leaked oil being communicated to an outlet for removal; wherein the piston is mounted in the control chamber without seals, with a small clearance between the piston and the control chamber, a controlled amount of hydraulic fluid adapted to continuously leak past the piston; and a gas seal between the valve and the support housing, the gas seal engaging the valve for preventing gaseous fuel from leaking from the gas passageway into the collection chamber, wherein the collection chamber provides a fail safe in which gas leakage past the gas seal is tolerated, any gas leakage being joined with leaked hydraulic fluid for removal and separation via the outlet.