Abstract: A fuel injection pumping apparatus of the rotary distributor type includes a rotary distributor member which is biased axially in one direction by a spring and is movable in the opposite direction by fluid pressure in a chamber. The axial setting of the distributor member determines the amount of fuel delivered by the apparatus. Fuel is supplied to the chamber through a supply path including a port and a groove which register intermittently as the distributor member rotates. Fuel is allowed to drain from the chamber through a drain path which includes a further port and a tapered groove defined by the distributor member and an axially adjustable sleeve surrounding the distributor member. The further port and the tapered groove register intermittently and it is arranged that the supply path and the drain path are closed to create a hydraulic lock in the chamber during the time mechanical forces are applied to the distributor member.

Abstract: A liquid fuel pumping apparatus for supplying fuel to an internal combustion engine has a rotary distributor member in which is mounted a plurality of pumping plungers which are engaged at their outer ends by cam followers which engage the internal surface of a cam ring. The distributor member is axially movable to vary the quantity of fuel supplied. Each follower includes a roller and a shoe and in order to reduce the amount of material required to produce the cam ring, the rollers are of a length substantially equal to the width of the cam ring and are held against axial movement relative to the cam ring. The shoes are held against axial movement relative to the distributor member. The width of the cam ring and the roller are such that the safe Hertzian stress in the cam ring is not exceeded, the additional width of the cam ring to accommodate the movement of the distributor member in previous designs not being required.

Abstract: A fuel injection nozzle includes a valve member axially movable in a bore. The bore is in part defined by a sleeve secured within a drilling. A space is defined between the end of the sleeve and the drilling and fuel under pressure is supplied to the space by means of a groove formed in the external surface of the sleeve. The sleeve serves to support the valve member for axial movement towards and away from a seating defined in the bore and fuel can flow from the space past the valve member and seating through an outlet when the valve member is lifted from the seating.

Abstract: A fuel pumping apparatus for supplying fuel to a compression ignition engine includes a positively reciprocated plunger which during a pumping stroke displaces fuel from a first pump chamber to an outlet and draws fuel into a second pump chamber. The apparatus includes an inlet chamber from which fuel is supplied to the second pump chamber, and a diaphragm pump which draws fuel into the inlet chamber through a fuel inlet. The pump drive shaft extends through the inlet chamber and carries vortex creating means whereby air entering the inlet chamber will collect around the shaft to cause early starvation of fuel supply to the associated engine in the event substantial quantities of air enter through said inlet.

Abstract: A rotary distributor pump has a radial bore mounting a pumping plunger at the outer end of which is a shoe carrying a captive roller engageable with the internal surface of a cam ring. The plungers are coupled to the shoes by a clip and further cam surfaces are provided engageable by the outer ends of the rollers. The plungers can therefore be positively reciprocated within the bore.

Abstract: A fuel injection pumping apparatus for supplying fuel to an internal combustion engine comprises a rotary distributor member having a transverse bore mounting pumping plungers arranged to be moved inwardly by cam lobes on a cam ring. The outward movement of the plungers is controller by varying the axial position of the distributor member. Fuel flows from the bore by way of a delivery passage to an outlet and also when the distributor member is set to provide low fuel delivery through a restricted passage and a flow channel. The period in terms of degrees of rotation of the distributor member for a given displacement of fuel through the outlet is extended as compared with an apparatus in which the restricted passage and flow channel are not provided. The cam ring is also angularly adjustable and the restricted passage and flow channel are positioned so that flow of fuel through the restricted passage ceases as the cam ring moves angularly with increasing speed.

Abstract: A reciprocable plunger fuel injection pump includes a plunger mounted in a pump barrel. A spring abutment is secured to the plunger and is engaged by one end of a spring the other end of which engages a further spring abutment slidable about the barrel. The barrel is provided with transverse apertures which locate balls which are held in an operative position by the abutment. The balls can be engaged by a step on the plunger to limit the outward movement of the plunger.

Abstract: A fuel system for a compression ignition engine includes a body defining a mounting for a fuel injection nozzle. The body also accommodates a reciprocable piston fuel pump having a piston which is actuable by an engine driven cam. The body also defines a surface which in use locates against a surface on the engine cylinder head. The surface is well removed from the bore in the cylinder head of the engine which contains the injection nozzle. In this manner forces applied to the body during operation of the system are applied to the cylinder head of the engine in an area which is sufficient strong to withstand the forces.

Abstract: A fuel system for a multi-cylinder engine comprises a plurality of engine operated pumps supplying fuel to the injection nozzles respectively of an engine. Each pump has an electromagnetic valve which must be closed to cause delivery of fuel by the respective pumps. The supply of power to the windings of the valves is effected by a power module controlled by a distributor circuit which receives sequence signals to ensure that the valves are closed at the correct time and a fuel level signal to ensure that the valve is closed for the correct length of time. In order to ensure that the amount of fuel delivered through each nozzle is the same a sensor provides a pulse signal at each working stroke of the engine. The period between each signal is determined by a timer circuit and the average of a number of periods is obtained from an averaging circuit. The average period is compared with the actual value and any error is used in a compensating circuit 29 to adjust the time the respective valve is closed.

Abstract: A fuel injection pumping apparatus for supplying fuel to an internal combustion engine includes a cylinder in which is located a fluid pressure operable piston. An outlet extends from one end of the cylinder and a valve controls the flow of fuel to the one of the cylinder from a fuel source. Also provided is an engine driven cam for actuating a plunger reciprocable in a bore. A second valve controls fluid flow from the bore to the other end of the cylinder and the valve is controlled by an electromagnetic actuator. Transducer means responsive to the position of the cam provides signals to control the actuator, the amount of fuel which flows into the one end of the cylinder being represented by the angular movement of the cam.

Abstract: A fuel system for a compression ignition engine comprises a fuel injection nozzle including a fuel pressure actuated valve member biased by a spring contained in a chamber. Fuel is supplied through an inlet passage under pressure from a fuel pump. Valve means is provided which can be opened to spill fuel from the pump. A passage conveys the shock wave resulting from the opening of the valve to the chamber to assist closure of the valve member of the nozzle.

Abstract: A liquid fuel pumping apparatus for supplying fuel to an internal combustion engine includes a high pressure pump 10 having an outlet 13 for connection in use to an injection nozzle. Fuel is supplied by a low pressure pump to the high pressure pump and the amount of fuel delivered through the outlet is controlled by a spill valve 19 which is electrically controlled. In the event of failure of the spill valve 19 in the control system 24 which controls the valve, the valve is arranged to move to the open position. In order to allow further operation of the associated engine valve means including a valve member 40 which can be moved to an operative position, is provided, the valve means prevents flow of fuel through the spill valve and also throttles the fuel supply to the high pressure pump thereby allowing a limited fuel supply to the associated engine.

Abstract: A fuel injection pumping apparatus of the rotary distributor type has pumping plungers located in a bore in the distributor member. A cup shaped member surrounds the distributor member and has slots in which are located cam followers. The cup shaped member is connected to a drive shaft as also is the distributor member. Slidable within the cup shaped member is an annular member which has a tapered internal surface which can register with complementary surfaces on the followers or on the plungers to limit the outward movement of the plungers.

Abstract: A fuel injection pumping apparatus for supplying fuel to an internal combustion engine comprises a throttle element 21 for controlling fuel flow between a low pressure and a high pressure pump the latter delivering fuel in timed relationship to the associated engine. The high pressure pump includes a piston movable to control the timing of injection of fuel to the engine. A valve member is movable to control the pressure applied to the piston and the valve member is movable against the action of a spring by fuel pressure, and the force exerted by the spring depends on the position of a lever movable about a fulcrum. The fulcrum is adjustable by a device and the lever is movable about the fulcrum by a cam surface on a slidable member the position of which is determined by an operator adjustable member forming part of a fuel control which determines the setting of the throttle element.

Abstract: A fuel pumping apparatus for supplying fuel to an internal combustion engine is of the rotary distribution type in which the outward movement of pumping plungers is determined by stops, the axial position of the distribution member being adjustable to determine in conjunction with the stops the amount of fuel delivered by the apparatus. The plungers are actuated by cam lobes on a cam ring and two types of cam lobe are provided. One type of lobe provides the normal pumping action while the other type of lobe is shaped to provide an initial delivery of fuel by the apparatus in advance of the main quantity of fuel. The initial quantity can be varied by moving the cam ring angularly.

Abstract: A fuel injection pumping apparatus for supplying fuel to an internal combustion engine is of the rotary distributor type having a distributor member including a transverse bore and a pair of pumping plungers slidable in the bore. At the outer ends of the plungers cam followers are mounted and first and second cam rings are provided having cam lobes to actuate the plungers respectively. The cam follower associated with one plunger has a shoe carrying a follower for engagement with the lobes of the first cam ring only and the cam follower associated with the other plunger has a shoe and a divided roller for engagement with the second cam ring which is also divided. The number of cam lobes on each cam ring is equal to the number of cylinders of the associated engine and the cam rings are positioned angularly relative to each other so that inward movement is imparted to each plunger at the same time during rotation of the distributor member.

Abstract: A fuel injection pumping apparatus for supplying fuel to an internal combustion engine comprises a reciprocable plunger, a roller forming part of a tappet assembly and a cam for actuating the roller and plunger. The cam is formed on the outer peripheral surface of a cup-shaped member, which is supported about a spigot. A drive shaft is integral with the cup-shaped part.

Abstract: A fuel injection pumping apparatus for supplying fuel to an internal combustion engine, includes an injection pump having a plunger movable inwardly by cam means to effect delivery of fuel and a valve operable to control the supply of fuel to the bore containing the plunger. The valve is electrically controlled and the apparatus includes an electronic control system which is supplied with signals from transducers which are responsive to the positions of the cam means and a rotary part of the apparatus relative to the housing of the apparatus. The control system has information stored therein regarding the profile of the cam means, and controls the operation of the valve so that the correct amount of fuel is supplied to the bore.

Abstract: A liquid fuel injection pumping apparatus of the rotary distributor type has stop means defined by complementary inclined surfaces on a rotary portion, coupled to a drive shaft and on the cam followers associated with the pumping plungers. The cam followers and the distributor member are axially movable to vary fuel quantity. In order to vary the initial rate of fuel delivery one or a reduced number of plungers only is arranged to deliver the initial flow of fuel. This is achieved by axial adjustment of one or more cam followers relative to the distributor member so that the associated plunger or plungers can move outwardly further during the filling stroke of the apparatus and will therefore be moved inwardly before the remaining plungers. Alternatively an axially movable part may be provided on said rotary portion.

Abstract: A fuel injection pumping apparatus comprises a rotary distributor member which is also axially slidable within a fixed sleeve. The distributor member is provided with a recess which communicates with a bore containing the pumping plungers. The recess is provided with mutually inclined leading and trailing edges which cover and uncover inlet ports and outlet ports as the member rotates. While an inlet port is in communication with the recess fuel is allowed to flow to the bore and when the inlet ports are covered and outlet port is uncovered to the recess fuel flows from the bore to the uncovered outlet port. The fuel quantity is varied by altering the axial position of the distributor member.