Pilot injection system for fuel injection pump

Details Pilot injection system for fuel injection pump Pilot injection system for fuel injection pump

1988-11-08

1989-06-13

Miller, Carl Stuart

Internal-combustion engines

Charge forming device

With fuel pump

123498, 123300, F02M 3900

Patent

active

048382337

ABSTRACT:
A pilot injection system according to the present invention, which is used in a fuel injection pump, has a casing attached to the pump. The casing connects internally with a pump chamber of the injection pump. A partition wall is fixed in the casing, whereby the pump chamber is divided from the inside of the casing. A movable wall, which is movably located in the casing, divides the inside space of the casing between a fuel-spill chamber and a holding chamber. The partition wall is formed with a valve hole, which connects the pump chamber and the spill chamber. The valve hole has a seat surface which faces the pump chamber. A valve plug, which is located in the pump chamber, can be seated on the seat surface. The valve plug is connected to the movable wall by means of a coupling rod, which extends through the valve hole. Located in the spill chamber is a return spring which urges the movable wall in a direction such that the valve plug closes the valve hole. Moreover, an actuator for moving the movable wall is disposed in the holding chamber of the casing. The actuator includes a stack of piezoelectric elements, which can extend or contract in accordance with a voltage applied thereto.

REFERENCES:
patent: 4385614 (1983-05-01), Eheim
patent: 4530337 (1985-07-01), Laufer
patent: 4586480 (1986-05-01), Kobayashi
patent: 4643155 (1987-02-01), O'Neill
patent: 4660523 (1985-10-01), Bauer
patent: 4730585 (1988-03-01), Abe
patent: 4782803 (1988-11-01), Kikuchi
patent: 4782807 (1988-11-01), Takahashi

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