Abstract: A liquid fuel injection pumping apparatus of the rotary distributor type includes a cam ring which is angularly adjustable to vary the timing of delivery of fuel. The setting of the cam ring is determined by a piston in which is located a servo valve. The servo-valve has a land to control fluid flow into a cylinder containing the piston. The servo valve is spring biased and a wedge is provided between a cylindrical member engaged by a spring and the servo-valve, the wedge being movable to alter the distance of the portion of the land which controls fluid flow of the servo valve. The wedge is coupled to the output member of a speed responsive device, the output member also being coupled to a fuel quantity control of the apparatus so that the setting of the cam ring depends upon the amount of fuel delivered by the apparatus.

Abstract: A fuel pumping apparatus includes a rotary distributor member including bores locating pump plungers. The plungers are engaged by shoes carrying rollers. An actuating member has a leading flank and a trailing flank and is movable along a path parallel to a tangent to the bore containing the distributor member. The leading flank is movable into the path of the rollers to impart inward movement to the rollers and the associated plungers. The position of the actuating member is adjustable to determine the amount of fuel pumped by the plungers.

Abstract: A fuel injection pumping apparatus includes a delivery valve interposed between the outlet of an injection pump and a plurality of outlet ports to which fuel is delivered in turn at successive delivery strokes of the injection pump. Communication with the outlet ports is established through a delivery passage and in order to minimize the loading of the spring which biases the delivery valve to the closed position, a branch passage is provided and which opens to an outlet port in advance of the communication with that outlet port of the main delivery passage. As a result some fuel flows through the branch passage the size of which in relation to the outlet port is such that fuel will be gradually diverted by way of the delivery valve and the main delivery passage during delivery of fuel. As a result the movement of the valve member of the delivery valve is less rapid and the stress on the spring is reduced.

Abstract: A fuel injection pumping apparatus for supplying fuel to an internal combustion engine includes an injection pump comprising a pair of reciprocable plungers located in a bore and moved inwardly in timed relationship by cam lobes formed on an annular cam ring. The bore containing the plungers is connected to a delivery passage whereby fuel is delivered in turn during successive inward movement of the plunger to a plurality of outlet ports. Fuel is supplied to the injection pump by way of valve means from a further pump, also incorporating a pair of reciprocable plungers movable inwardly by means of cam lobes on a cam ring. The displacement of the plungers of the further pumps is greater than that of the plungers of the injection pump and means is provided to alter the stroke of the plungers of the further pump during which fuel is supplied to the injection pump.

Abstract: A fuel pumping apparatus includes a housing, a rotary distributor member mounted within the housing and a plurality of outlets formed in the housing and communicating in use, with the injection nozzles of an associated engine. The outlets are divided into at least two axially spaced groups and all the outlets are disposed on one side of a plane including the axis of rotation of the distributor member.