Patent ID: 6036460
Filing Date: 2000-03-14
Classification: F02M

Abstract:
A pump for a fuel injection system, the pump comprising:a pump body having a pumping chamber, a fuel inlet for supplying fuel to the pumping chamber, an outlet port, and a control valve chamber between the pumping chamber and the outlet port;an actuatable control valve disposed in the control valve chamber for controlling fuel, the control valve including a valve body moveable between actuated and deactuated positions;a stator assembly including an actuator operable to actuate the control valve; andan armature having a middle beam portion connected to an outer body portion, the control valve being secured to the middle beam portion, and the valve body and the armature being arranged such that operation of the actuator causes the armature to urge the valve body axially toward the actuated position,wherein the middle beam portion has a periphery with a free part and a fixed part that is fixed to the outer body portion, the armature having a slot extending therethrough and located along the periphery free part, the free part having a continuous portion of sufficient length such that the armature flexes at the periphery fixed part and the middle beam portion moves generally axially relative to the outer body portion at the free part along the slot during actuation of the control valve so that movement of the valve body relative to the armature outer body portion is damped as the valve body moves to the actuated position.