High pressure fuel injection device for engine

Claim 1

An accumulator type of injection nozzle comprised of an accumulator chamber supplied with high pressure fuel from a fuel inlet, a nozzle port leading from said accumulator chamber, an injector valve means for moving said injector valve in response to fuel pressure relative to said nozzle port between a closed position and an open position for controlling the discharge of fuel from said accumulator chamber through said nozzle port, said means for moving said injector valve in response to fuel pressure comprising a control chamber for receiving pressurized fuel from said fuel inlet, said control chamber having a relief passage, an actuating member supported for movement within said control chamber and associated with said injector valve for retaining said injector valve in its closed position when said control chamber is pressurized and for movement of said injector valve to its opened position when pressure is relieved in said control chamber, and relief valve means moveable between a closed position for closing said relief passage and maintaining pressure in said control chamber and an opened position for opening said relief passage and relieving said control chamber pressure for effecting fuel discharge through said nozzle port and actuating means associated with said relief valve means for urging said relief valve means to one of its positions when said actuating means is energized, and variable stop means associated with said injector valve for varying the open position of said injector valve to either of at least two selected positions relative to said nozzle port for controlling the amount of fuel discharged by said injector valve.