Fuel injector with direct needle control for an internal...

Details Fuel injector with direct needle control for an internal... Fuel injector with direct needle control for an internal...

2008-09-02

2008-09-02

Hwu, Davis D (Department: 3752)

Fluid sprinkling, spraying, and diffusing

Unitary injection nozzle and pump or accumulator plunger

C239S096000, C239S584000, C239S585400, C239S102200

Reexamination Certificate

active

11344099

ABSTRACT:
A fuel injector with direct needle control has a nozzle needle guided in a nozzle body, and an actuator and a hydraulic pressure boosting unit that has an actuator pressure boosting piston connected to the actuator and a nozzle needle pressure boosting piston connected to the nozzle needle. The actuator pressure boosting piston and the nozzle needle pressure boosting piston both act on a coupler chamber. The nozzle needle pressure boosting piston contains a cylindrical chamber in which a control piston is axially guided, whose coupler chamber pressure surface is exposed to the coupler chamber and whose differential pressure chamber pressure surface is exposed to an inner differential pressure chamber contained in the cylindrical chamber. At its end oriented away from the coupler chamber, the nozzle needle pressure boosting piston is associated with an outer differential pressure chamber that communicates with the inner differential pressure chamber via a hydraulic connection.

REFERENCES:
patent: 4784102 (1988-11-01), Igashira et al.
patent: 6079636 (2000-06-01), Rembold et al.
patent: 6390385 (2002-05-01), Hardy et al.
patent: 6766965 (2004-07-01), D'Arrigo
patent: 6776354 (2004-08-01), Cooke
patent: 103 26 046 (2004-12-01), None
patent: 103 47 769 (2005-01-01), None

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