Fuel injection pumping apparatus

Claim 1

A fuel injection pumping apparatus for supplying fuel to an internal combustion engine and comprising a body part, a rotary distributor member located in the body part, an outwardly extending bore formed in the distributor member and a plunger means located therein, means for feeding fuel to said bore to move the plunger means outwardly during a filling stroke of the apparatus, a delivery passage communicating with the bore and arranged to register with an outlet port in the body part during a delivery stroke of the apparatus, a cam for imparting inward movement to the plunger means to effect delivery of fuel, stop means for limiting the outward movement of the plunger means, said stop means being arranged so that the amount of fuel delivered during the delivery stroke depends upon the axial setting of the distributor member, resilient means biassing the distributor member in one axial direction, a variable volume chamber defined in part by an outwardly extending face of the distributor member or a part movable therewith, valve means for controlling the pressure of liquid in said chamber thereby to determine the axial setting of the distributor member, said valve means including an axially adjustable rod and a sleeve in which said rod is mounted, said rod and sleeve being movable relative to each other, a variable orifice defined by the rod and sleeve and through which liquid under pressure can flow from said chamber, means for adjusting the axial setting of the rod and a linkage extending between the sleeve and the distributor member, said sleeve being axially movable by said linkage, whereby for a given change in the setting of said rod, the pressure in said chamber will vary and the distributor member will move an amount determined by the change in the setting of said rod.