Fuel injector with hydraulically controlled check valve
First Claim
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1. A fuel injector, comprising:
- an injector housing;
an intensifier piston located within the injector housing, the intensifier piston having a stroking cycle to increase a pressure of a fuel;
a nozzle coupled to the injector housing, the nozzle adapted to provide a discharge of the fuel through the nozzle during the stroking cycle of the intensifier piston;
a needle valve located within the injector housing, the needle valve having a first end adjacent to the nozzle and an opposing second end, the first end of the needle valve adapted to control the discharge of the fuel through the nozzle, the needle valve having an open position that allows the discharge of the fuel through the nozzle and a closed position that closes the nozzle; and
a nozzle return chamber within the injector housing adjacent the second end of the needle valve, the nozzle return chamber adapted to receive a working fluid to bias the needle valve into the closed position by a pressure of the working fluid.
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Abstract
A fuel injector including an injector housing, a nozzle, a needle valve, and a nozzle return chamber. The nozzle discharges a fuel from the fuel injector. The needle valve has a first end adjacent to the nozzle to control the discharge of the fuel through the nozzle. The nozzle return chamber is adjacent a second end of the needle valve and receives a working fluid to bias the needle valve into the closed position.
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Citations
13 Claims
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1. A fuel injector, comprising:
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an injector housing;
an intensifier piston located within the injector housing, the intensifier piston having a stroking cycle to increase a pressure of a fuel;
a nozzle coupled to the injector housing, the nozzle adapted to provide a discharge of the fuel through the nozzle during the stroking cycle of the intensifier piston;
a needle valve located within the injector housing, the needle valve having a first end adjacent to the nozzle and an opposing second end, the first end of the needle valve adapted to control the discharge of the fuel through the nozzle, the needle valve having an open position that allows the discharge of the fuel through the nozzle and a closed position that closes the nozzle; and
a nozzle return chamber within the injector housing adjacent the second end of the needle valve, the nozzle return chamber adapted to receive a working fluid to bias the needle valve into the closed position by a pressure of the working fluid. - View Dependent Claims (2, 3, 4, 5)
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6. A fuel injector, comprising:
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an injector housing;
an intensifier means for increasing a pressure of a fuel during a stroking cycle;
a nozzle coupled to the injector housing, the nozzle adapted to provide a discharge of the fuel through the nozzle during the stroking cycle of the intensifier means;
a valve means for controlling the discharge of the fuel through the nozzle, the valve means having an open position that allows the discharge of the fuel through the nozzle and a closed position that closes the nozzle; and
a valve return means for receiving a working fluid to bias the valve means into the closed position by a pressure of the working fluid. - View Dependent Claims (7, 8, 9)
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10. A method of controlling a discharge of a fuel from a fuel injector, comprising:
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moving an intensifier piston through a stroking cycle to increase a pressure of the fuel;
discharging the fuel from the fuel injector through a nozzle during the stroking cycle of the intensifier piston; and
providing a working fluid to a nozzle return chamber for biasing a needle valve into a closed position by a pressure of the working fluid, the needle valve being adapted to control the discharging of the fuel through the nozzle, the needle valve having an open position that allows the discharging of the fuel through the nozzle and the closed position that closes the nozzle. - View Dependent Claims (11, 12, 13)
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Specification