Liquid fuel injection pumping apparatus

Claim 1

A liquid fuel injection pumping apparatus comprising in combination, an injection pump adapted to be driven in timed relationship with an associated engine, said injection pump defining a pumping chamber, an outlet from the pumping chamber and which in use is connected to a nozzle mounted in an engine cylinder, a spill port extending from the pumping chamber, a spill valve rotatable in synchronism with the injection pump for controlling the flow of fuel through the spill port during a pumping stroke of the injection pump, the axial setting of said spill valve determining the quantity of fuel supplied through the outlet and the angular setting of the spill valve relative to the injection pump serving to alter the timing of injection of fuel through said outlet to the engine, a pulley rotatable in synchronism with the injection pump, means restraining the pulley against axial movement, a flange mounted on said pulley and rotatable therewith, a first centrifugal weight pivotally mounted on said flange, a hollow cylindrical member located within a bore formed in the pulley, a helical spline connection between the pulley and said hollow cylindrical member, a rod extending within said hollow cylindrical member, said rod being coupled to said spill valve, means connecting said rod to said hollow cylindrical member whereby relative axial movement of the rod and cylindrical member can occur, a lever integral with said first weight, said lever extending through an aperture in said hollow cylindrical member and engaging said rod for moving with increasing engine speed the spill valve axially in a direction to reduce the amount of fuel supplied to the engine, first resilient means acting on the rod in opposition to the force exerted by said first centrifugal weight operator adjustable means for varying the force exerted by the first resilient means, and a second centrifugal weight carried by said flange, a lever connected to said second weight, said lever engaging said hollow cylindrical member whereby with varying engine speed the axial position of the hollow cylindrical member will vary to effect angular movement of the spill valve relative to said pulley.