Fluid driven piston assembly and fuel injector using same

Details Fluid driven piston assembly and fuel injector using same Fluid driven piston assembly and fuel injector using same

1997-12-10

2000-10-03

Thorpe, Timothy S.

Pumps

Motor driven

Fluid motor

123446, F04B 1704

Patent

active

061264121

ABSTRACT:
A fluid driven piston assembly, preferably for use in a hydraulically-actuated fuel injector, includes a body that defines an actuation fluid cavity and a piston bore. A piston is positioned in the piston bore and moveable between a retracted position and an advanced position. The piston has a pressure surface exposed to fluid pressure in the actuation fluid cavity when it is away from its retracted position. A sealing member is positioned in sealing contact between the piston and the body when the piston is in its retracted position. The sealing member isolates a portion of the piston's pressure surface from the fluid pressure in the actuation fluid cavity when the piston is in its retracted position.

REFERENCES:
patent: 2537748 (1951-01-01), Evans et al.
patent: 3329068 (1967-07-01), Klaus
patent: 3689205 (1972-09-01), Links
patent: 3771917 (1973-11-01), Davies
patent: 3855797 (1974-12-01), Papiau
patent: 4030299 (1977-06-01), Reuschel et al.
patent: 4140351 (1979-02-01), Nogami
patent: 5107681 (1992-04-01), Wolfbauer, III
patent: 5127381 (1992-07-01), Kupzik et al.
patent: 5257606 (1993-11-01), Willman et al.

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