Servo valve for an injection nozzle

Details Servo valve for an injection nozzle Servo valve for an injection nozzle

1996-10-25

1998-10-13

Moulis, Thomas N.

Internal-combustion engines

Charge forming device

With fuel pump

239 96, F02M 3704, F02M 4116

Patent

active

058197109

ABSTRACT:
A servo valve for an injection nozzle includes a housing having a valve chamber, a high-pressure opening, a connecting opening and a return opening. The valve chamber movably accommodates a valve member which can be displaced by actuating means to bear selectively against a first seat and a second seat. The valve member, when bearing against the first seat, closes the return opening and connects the high-pressure opening to the connecting opening. When bearing against the second seat it closes the high-pressure opening and connects the connecting opening to the return opening. The connecting opening is connected to a working chamber of the injection nozzle whose nozzle is closed when the working chamber is subjected to high pressure and opens upon a drop in pressure in the working chamber. The actuating means includes a component which varies in length when electrically actuated and which is connected to the valve member through the return opening by way of an actuating member.

REFERENCES:
patent: 4649886 (1987-03-01), Igashira et al.
patent: 4909440 (1990-03-01), Mitsuyasu et al.
patent: 4993637 (1991-02-01), Kanesaka
patent: 4997133 (1991-03-01), Ausiello et al.
patent: 5176120 (1993-01-01), Takahashi
patent: 5441028 (1995-08-01), Felhofer
patent: 5551634 (1996-09-01), Raab et al.
patent: 5605134 (1997-02-01), Martin

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