Fuel injection pump
AssigneeNissan Motor Co., Ltd.
InventorsKoichi Takahashi, Manabu Tsunematsu
Life of this patent
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Abstract
A fuel injection pump for an automotive fuel injection system, comprising a fuel metering unit which includes a plunger axially movable in synchronism with revolution of a pump shaft and rotatable about its axis for regulating timings and quantities of fuel injection, and a control device which consists largely of a centrifugal governor responsive to a centrifugal force developed by the revolution of the pump shaft for driving the plunger to turn about its axis through an angle proportional to the pump shaft revolution speed and a vacuum-operated actuator responsive to vacuum in an intake manifold of the engine for driving the plunger in accordance with the vacuum in the intake manifold.
Claims6
A fuel injection pump of a fuel injection system of an automotive vehicle, comprising a pump shaft rotatable about its axis, a fuel metering unit having a plunger which is axially reciprocally movable in cycles synchronized with the revolution of the pump shaft for discharging fuel in each of the cycles and which is rotatable about its axis for regulating timings, durations and quantities of the discharge of the fuel in said cycles, an elongated control member which is in driving engagement with the plunger and which is axially movable in both directions for driving the plunger to rotate in either direction about its axis, resilient biasing means supported on the elongated control member for biasing the control member in one of said directions, a centrifugal governor responsive to a centrifugal force developed by the revolution of the pump shaft, linkage means engaging the elongated control member and the centrifugal governor for axially moving the elongated control member in the other of said directions against a force of said resilient biasing means, and a vacuum-operated actuator responsive to vacuum in an air intake unit of the engine for bodily moving a one-piece assembly comprising the elongated control member, the resilient biasing means, the centrifugal governor and the linkage means in a direction parallel to the directions of axial movement of the elongated control member in accordance with the vacuum directed from the air intake unit to the vacuum-operated actuator.
Dependencies are inferred from the claim text.