Abstract: A fuel pump comprises a distributor member having a plunger reciprocable within a bore. A shoe and roller arrangement is associated with the plunger, the roller of which cooperates with a cam surface to move the plunger under the influence of the cam surface. Drive means is provided for driving the shoe and roller arrangement, the drive means including a member having a bore of circular cross-section, the shoe of the shoe and roller arrangement being reciprocable within the bore of the drive means.

Abstract: An accumulator type fuel injection system has a cam actuated plunger pump for charging an accumulator chamber with fuel under pressure and valve means which in one position connects the accumulator chamber with a fuel delivery passage to cause delivery of fuel and in its other position to connect the delivery passage to a drain channel to terminate delivery of fuel. The drain channel includes a restrictor. The system includes a piston slidable in a cylinder having one end connected to the plunger pump through a valve and to the outlet of a low pressure pump. The other end of the cylinder is connected to the drain channel upstream of the restrictor. The piston acts to displace fuel in the one end of the cylinder to the plunger pump when the valve means is moved to its second position.

Abstract: A mounting for an advance piston comprises a sleeve having flanges arranged to extend outwardly and arranged to engage a pump housing in order to secure the sleeve thereto, the sleeve extending within a passage provided in the pump housing. One or more of the flanges may be securable to the sleeve for example, by screw threaded engagement, or by means of bolts.

Abstract: A rotary distributor type fuel pumping apparatus has two pairs of plungers housed in respective diametrical bores which intersect each other. One of the plungers is longer than the remaining plungers conveniently by providing an extension at its inner end. The extension lies in the paths of movement of the remaining plungers so as to minimize the risk of damage to the plungers.

Abstract: A fuel system for supplying fuel to a compression ignition engine includes an accumulator in which fuel is stored at high pressure. The fuel being supplied to the accumulator from a high pressure cam actuated pump which includes pumping plungers operable in timed relationship with the associated engine. The apparatus also includes a distributor member having a delivery passage which can register with outlet ports in turn. Valve means is provided and this is operable in a first setting to connect the high pressure pump to the delivery passage so that fuel is supplied at a low rate to the associated engine and a second setting in which the accumulator is connected to the delivery passage to achieve a high rate of fuel delivery to the engine.

Abstract: A fuel pumping apparatus of the rotary distributor type includes a fluid pressure actuable spill valve member operable to terminate delivery of fuel through an outlet from a bore containing the pumping plungers. The valve member is moved to the open position by an actuating piston. One end of the cylinder containing the actuating piston is connected to a low pressure source of fuel by way of a non-return valve and the same end of the cylinder can be connected by a control valve to a high pressure source of fuel when spillage of fuel is required. Associated with the piston is a balance piston and the two pistons define a flow path for fuel from the one end of the cylinder to the bore to ensure that the bore is completely full of fuel prior to the next delivery of fuel through an outlet.

Abstract: A fuel pumping apparatus of the rotary distributor type has a fluid pressure operable valve which can be opened to terminate delivery of fuel to an associated engine. The operation of the valve is controlled by an axially movable shuttle contained in a cylinder. The shuttle is biased toward one end of the cylinder and is displaced away from the one end of the cylinder by fuel supplied by an auxiliary plunger. The shuttle is angularly movable by an actuating mechanism to vary the extent of movement before operation of the valve. The shuttle is biased to the one end of the cylinder by a shuttle return piston in order to reduce the frictional loads on the actuating mechanism. The cylinder containing the return piston is connected to an accumulator chamber.

Abstract: A fuel injection pumping apparatus of the rotary distributor type has a fixed stroke pumping plunger housed in a bore formed in a rotary distributor member. The pumping plunger is actuated by cam lobes formed on a cam ring. A piston housed in a cylinder is provided and one end of the cylinder is connected to the bore. The piston is spring biased towards the one end of the cylinder and the extent of movement of the piston away from the one end of the cylinder is limited by a stop. The piston absorbs the initial volume of fuel delivered by the pumping plunger as the latter is moved inwardly by the cam lobes thereby ensuring that fuel is delivered to an associated engine at a high rate.

Abstract: A rotary distributor fuel pumping apparatus includes a cam actuated pumping plunger which delivers fuel to a plurality of outlets in turn during successive inward movements. A spill valve is provided which can be opened when fluid pressure is applied to a piston to spill fuel from the bore. An auxiliary plunger delivers fluid under pressure which can be applied to the piston through a control valve. The control valve includes an annular spring loaded component which is moved by the fluid pressure and an angularly adjustable rod which is surrounded by the component. The rod is provided with a helical groove and the component with a slot and when these are brought into communication fluid under pressure is applied to the piston.

Abstract: A rotary distributor fuel injection pumping apparatus has a pumping plunger actuatable by a cam to deliver fuel through a fuel delivery circuit, to an engine. The quantity of fuel supplied is determined by a spill valve which is actuated by a fluid control circuit including an auxiliary plunger also operated by the cam. A shuttle is movable by fuel displaced by the auxiliary plunger until it is brought to rest and the pressure increase actuates the spill valve. A valve is provided which connects the control circuit and the fuel delivery circuit during the initial movement of the shuttle.

Abstract: A distributor type fuel injection pump has a main pumping plunger and an auxiliary plunger operable in synchronism by a cam. Also provided is a fluid pressure operable spill valve which is opened when the pressure of fluid developed by the auxiliary plunger becomes sufficiently high. The fluid displaced by the auxiliary plunger causes movement of a shuttle and the movement of the shuttle is halted to cause operation of the spill valve, by an hydraulic lock which is created when the movement of the shuttle closes an escape path from the end of the cylinder in which it is located.

Abstract: A fuel pumping apparatus of the rotary distributor type includes a spill passage 20 connected with the bore 12 which houses the pumping plungers 9. A seating 22 is defined about the spill passage and a valve member 23 is provided for cooperating with the seating. A piston 25 is coupled to the valve member and is slidable in a cylinder. The piston defines a surface against which fuel under pressure from the bore 12 can act to lift the valve member from the seating. The application of fuel under pressure to the surface of the piston is controlled by an electro-magnetically operable control valve 32A.

Abstract: A fuel pumping apparatus has a pumping plunger operable by a cam to deliver fuel to an outlet. A spill valve is provided which when open permits fuel to spill from the bore in which the pumping plunger is located. An actuating piston is located in a first cylinder and is coupled to the spill valve and a storage piston is located in a second cylinder connected to the first cylinder. A control valve controls the pressure in the first cylinder and when the pressure is raised the actuating piston lifts the spill valve from the seating and the fuel from the bore can flow into the first cylinder and when the actuating piston is displaced therefrom, into the second cylinder.

Abstract: A fuel pumping apparatus of the rotary distributor type includes an accumulator volume into which fuel can be spilled to terminate delivery of fuel by the apparatus. The accumulator is defined by a movable member in the form of a sleeve which is slidable on an extension of the distributor member and has a closed end. The extension defines a seating with which can be engaged by a valve element defined by the sleeve. The extension and sleeve define an annular space connected to the pumping chamber of the apparatus and mechanical means is provided to effect initial movement of the sleeve against the action of a spring to lift the valve element from the seating to allow fuel flow into the accumulator volume.

Abstract: A fuel injection pumping apparatus for supplying fuel to a compression ignition engine has an annular cam ring which has internal cam lobes for imparting inward movement through cam followers respectively to pumping plungers mounted in a rotary distributor member. Stop rings are mounted alongside the cam ring to determine the maximum outward movement of the plungers. The stop rings are angularly adjustable to enable the maximum amount of fuel supplied to the engine to be varied. Two adjusting devices are provided the first being a piston which is subject to a fluid pressure varying with speed. The piston is biased by a spring and sets the stop rings to allow an excess of fuel for engine starting purposes and the second is a diaphragm assembly responsive to the air pressure in the engine inlet manifold.