Importance

Loading Importance Indicators...

Abstract

An injection timing control device for a distributor-type fuel injection pump, has a timer piston slidable within a cylinder in response to a difference between pump chamber pressure and the force of a timer spring to thereby rotate a roller holder for varying the fuel injection timing. A movable seat member is urged by a second spring toward the timer piston, and has one end thereof disposed for urging contact with one end face of the timer piston, which has a total effective pressure receiving area at which the pump chamber pressure acts on upon the timer piston. The total effective pressure receiving area is decreased while the seat member abuts against the one end face of the timer piston. A stopper allows the seat member to be moved by the force of the second spring toward the timer piston with the one end kept in urging contact with the one end face of the timer piston while the timer piston moves from a first position, in which the fuel injection timing is most retarded, to a second position, in which the fuel injection timing is advanced by a predetermined amount, and inhibits the seat member from being moved by the force of the second spring toward the timer piston to bring the one end out of contact with the one end face of the timer piston after the timer piston is moved beyond the second position in the timing advancing direction.

Loading the Abstract Image...

First Claim