Fuel injector for internal combustion engines

Details Fuel injector for internal combustion engines Fuel injector for internal combustion engines

1997-02-04

1998-04-28

Moulis, Thomas N.

Internal-combustion engines

Charge forming device

Fuel injection system

F02M 4100

Patent

active

057432341

ABSTRACT:
In this fuel injector for internal combustion engines, a pressure chamber is provided at an end portion of a pressure increasing piston which is adapted to increase the pressure of a fuel in a pressure increasing chamber, and a hollow portion which is on the back side of the pressure increasing piston is opened to the atmospheric air through communication ports formed in an injector body. The pressure increasing piston comprises a small-diameter portion of a plunger which defines a part of the pressure increasing chamber, a large-diameter portion of a piston which defines a part of the pressure chamber, and a guide ring portion extending downward from the whole circumference of the large-diameter portion and forming a sliding surface with respect to a hollow. The hollow portion is provided with a return spring for biasing the pressure increasing piston toward the pressure chamber. Since the hollow portion of this fuel injector is opened to the atmospheric air, the resistance to the vertical movement of the fuel pressure increasing piston is eliminated, and the responsiveness of the needle valve is improved.

REFERENCES:
patent: 3961612 (1976-06-01), Okamoto et al.
patent: 4437443 (1984-03-01), Hofbauer
patent: 4844035 (1989-07-01), Takagi
patent: 5181494 (1993-01-01), Ausman
patent: 5392749 (1995-02-01), Stockner et al.
patent: 5622152 (1997-04-01), Ishida

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