Fluid seal for cyclic high pressures within a fuel injection

Details Fluid seal for cyclic high pressures within a fuel injection Fluid seal for cyclic high pressures within a fuel injection

1996-05-23

1997-11-04

Miller, Carl S.

Internal-combustion engines

Charge forming device

With fuel pump

123506, 92168, F02M 3704

Patent

active

056828616

ABSTRACT:
A fuel injector includes an injector body with a plunger bore that opens to a nozzle outlet. A plunger having a pressure face and a side surface is positioned to reciprocate in the plunger bore between an advanced position and a retracted position. A portion of the plunger bore and the plunger define a fuel pressurization chamber that opens to the nozzle outlet. A needle valve is positioned in the injector body adjacent the nozzle outlet and is moveable between an open position which opens the nozzle outlet and a closed position in which the nozzle outlet is closed to the fuel pressurization chamber. An O-ring is in contact with the side surface of the plunger and the plunger bore on the injector body and serves to seal against fuel leakage past the plunger. Pressure acting on the O-ring is attenuated by providing either a pressure accumulation volume between the pressure face end of the plunger and the O-ring and/or a pressure release passage that opens the plunger bore to a low pressure return line below the O-ring.

REFERENCES:
patent: 2328438 (1943-08-01), Ernst
patent: 3507584 (1970-04-01), Robbins
patent: 4082072 (1978-04-01), Johnson
patent: 4141675 (1979-02-01), O'Neill
patent: 4235265 (1980-11-01), Felirs
patent: 4448574 (1984-05-01), Shimizu
patent: 5067880 (1991-11-01), Finsterwalder
patent: 5259351 (1993-11-01), Rossingnol
patent: 5402764 (1995-04-01), Rossngnol
patent: 5492098 (1996-02-01), Hafner
patent: 5601345 (1997-02-01), Tackett

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