Abstract: A fuel injection pumping apparatus for supplying fuel to an internal combustion engine comprises an injection pump to which fuel is supplied by a low pressure pump. A part of the injection pump defines a surface against which a control pressure can act to vary the amount of fuel supplied by the injection pump, the part being spring loaded by a spring in a direction to oppose the force exerted by the control pressure and to increase the amount of fuel supplied. The control pressure is derived from the low pressure pump by means of a control system and if the output pressure of the low pressure pump should fall due to for example fuel starvation, the part will move in the direction to increase the amount of fuel supplied by the apparatus, this being permitted even though the output pressure is reduced.

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 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: An injection pump includes a rotor having a central axial bore and a radial bore and rotated in relationship with an engine. A free piston reciprocably inserted in the central axial bore defines a first and second chamber. The first chamber includes a plurality of first radial passages and a radial spill port and communicate with the radial bore and the second pressure chamber includes a plurality of second radial passages and a discharge passage. A pair of plungers which is disposed in the radial bore is so constructed as to produce, in accordance with the revolution of the rotor, a compression period in which the liquid fuel is pressurized in the first pressure chamber and pressurized fuel in the second pressure chamber is supplied to the engine through the discharge passage, and a suction period in which the liquid fuel is supplied to the pressure chambers.

Abstract: The radial piston machine comprises a rotor-stator unit including an outer stator and an inner rotor received in a housing, with the rotor being rotatable with a connected shaft through a spring clutch engaging one rotor end face. The rotor is centered axially elastically relative to the stator. The stator includes on its periphery at least one elastic body supporting the unit in the housing in a radially elastic and substantially torsionally secured and axially located fashion. At least another sealing body provided on the periphery of the stator seals the unit relative to the housing in the area of a pressure port, such that the elastic body associated with the sealing body is not acted upon by hydraulic pressure.

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.

Abstract: A fuel injection system for an internal combustion engine employing a rotary valve for delivering fuel to fuel injectors in which fuel injection timing is precisely controlled to an optimum range by automatically controlling the rotary valve in response to the number of revolutions of the engine. The system includes a high pressure accumulator connected to a fuel pump and a low pressure accumulator connected to a tank through a variable restrictor valve. The rotary valve functions to selectively connect each injector to the high and low pressure accumulators as it rotates whereby metered amount of fuel can be fed into a plunger chamber of each injector when a piston chamber of the injector is connected to the low pressure accumulator and the fuel can be injected through nozzle orifices when the piston chamber is connected to the high pressure accumulator.

Abstract: A fuel injection pumping apparatus of the rotary distributor type has a distributor member which is also axially movable to determine the allowed outward movement of the pumping plungers and hence the amount of fuel supplied to the associated engine. The extent of outward movement is determined by inclined stop surfaces which co-operate with complementary surfaces on shoes associated with the plungers. In order to minimize axial movement of the distributor member when the shoes engage the stop surfaces a chamber to which liquid is supplied to vary the axial setting of the distributor member, is locked off from fluid supply and drain passages, by a servo valve 41 when the correct position of the distributor member is obtained. A hydraulic lock is thus created in the chamber.

Abstract: A control apparatus for an electrically controlled injection pump of a Diesel engine comprises a main controller for controlling valve opening durations of an injection quantity control solenoid valve and an injection timing control solenoid valve provided for the injection pump so that a desired quantity of fuel is supplied to the engine in an optimal injection timing and a sub-controller for controlling the injection pump in place of the main controller upon occurrence of failure of the latter. The sub-controller is constituted by an injection timing signal generator for preparing an injection timing control signal of a fixed duration applied to the timing control solenoid valve and an injection quantity signal generator for preparing an injection quantity control signal applied to the quantity control solenoid valve, which signal has a pulse width variable in dependence on a parameter representative of a desired operation state of the engine.

Abstract: A liquid fuel pumping apparatus for supplying fuel to a multi-cylinder engine has a plurality of outlets for connection to the injection nozzles of the engine. The apparatus includes a spill passage and a spill control valve which is electrically controlled. The valve is closed to cause fuel from a high pressure pump to be delivered through the outlets, fuel being supplied by the high pressure pump to the outlets in turn. A pressure transducer provides signals indicative of the pressures attained in the various outlets during delivery of fuel therethrough. One of the pressure signals serves as a standard and the other signals are compared with this signal to produce correction signals which vary the time the spill valve is closed when fuel is supplied to those outlets to which the other signals pertain.

Abstract: A fuel injection pump of the rotary distributor type has angularly adjustable stop rings which limit the outward movement of the pumping plungers so as to control the maximum fuel output of the pump. The stop rings have an outwardly extending curved stop surface so that the maximum fuel output can be altered by altering the angular setting of the rings. The latter portion of the stop surface is arranged to curve outwardly at a greater rate so that as the engine speed increases the plungers no longer follow paths determined by said surface so that the maximum fuel delivery of the pump decreases.

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 injection pumping apparatus includes a rotary distributor member having a transverse bore containing a pumping plunger, a single passage is formed in the distributor member and extends from the bore to the periphery of the distributor member, inlet passages and outlets are formed in the body part and break out into the periphery of the distributor member in a common radial plane. The inlet passages and outlets are alternately positioned around the axis of rotation.

Abstract: A two speed governor for a fuel pumping apparatus which supplies fuel to an internal combustion engine comprises a source of fuel under pressure which varies in accordance with the speed of the engine. Fuel is supplied through a first orifice and a second orifice in series from the source. The second orifice is defined by a port the size of which is controlled by a manually operable rod while the first orifice is defined by a port the size of which is controlled by a spool responsive to the pressure of the source. The port closes at the maximum allowed engine speed. A third orifice defined by a port is also controlled by the spool and is connected in parallel with the second orifice. The port is closed at speeds above the idling speed of the engine. In the intermediate speed range the engine is controlled by the rod.

Abstract: A liquid fuel injection pumping apparatus of the rotary distributor type has two forms of cam lobe on its cam ring. The first form of cam lobe is a pumping lobe which can effect inward movement of a plunger to achieve pumping of fuel and after the crest of the lobe has been passed allows outward movement of the plunger to lower the fuel pressure in the various passages in the apparatus. The other form of lobe is a holding lobe which while one plunger is being moved inwardly holds another plunger against movement. When the crest of the holding lobe is reached the associated plunger is allowed to move outwardly and this movement is arranged to take place shortly before the end of the inward movement of the plunger associated with a pumping lobe. The effect is to reduce the period towards the end of fuel delivery at which fuel is supplied at a reducing rate.

Abstract: A fuel injection pump, in particular a radial-piston pump having rotating cams, is proposed in which a reservoir is incorporated in the supply line leading from the supply pump to the pump work chamber, and in which a reservoir pressure is used at the same time for restoring the outset position of the pump pistons during the intake stroke.

Abstract: A fuel injection pumping apparatus comprises an axially movable distributor member the axial setting of which determines the amount of fuel supplied by the apparatus at each pumping stroke. The distributor member is biassed by a spring in one axial direction and is movable in the opposite direction by varying the fluid pressure in a chamber through a port. The port is formed in a sleeve which is coupled to the distributor member by means of a lever and a rod member is axially movable within the sleeve. The axial position of the rod member can be varied to alter the effective size of the port and the distributor member and sleeve move because of the change in pressure in the space. A new equilibrium position is thus established with the distributor member following the movement of the rod member.

Abstract: A liquid fuel injection pumping apparatus of the axially slidable rotor type includes a low pressure supply pump which supplies fuel to an injection pump including pumping plungers mounted in a rotary distributor member. A surface of the distributor member is located within a chamber to which a control pressure can be supplied by way of a control valve from the outlet of the low pressure pump. The distributor member is moved by increasing control pressure against a spring to reduce the amount of fuel supplied by the injection pump. A valve is provided which is responsive to the pressure drop across the control valve, the valve acting to prevent flow of fuel to the injection pump in the event that the pressure drop across the control valve falls below a predetermined value.

Abstract: A liquid fuel injection pumping apparatus for supplying fuel to an engine includes an injection pump to which fuel is supplied through a feed passage in a distributor member from a low pressure pump. Fuel is delivered by the injection pump through a separate delivery passage which can register with an outlet. In order to enable air to be purged from the passages and injection pump, the delivery passage during the time fuel is being supplied to the injection pump is arranged to register with a further port which communicates in the example with a fuel supply tank. A restrictor is provided to control fuel flow through the further port.

Abstract: A fuel pumping apparatus of the rotary distributor type has cam followers comprising rollers supported by shoes interposed between the pumping plungers and the cam ring. Stop rings are provided to limit the outward movement of the followers and one of these rings is axially adjustable so that the amount of fuel supplied by the apparatus can be controlled. In order to provide reduced initial rate of injection of fuel the axial spacing of the surfaces on at least one of the followers which contact the stop rings, is smaller than in the case of the other plunger or plungers so that at the end of the filling stroke of the apparatus of the plunger associated with that follower will project outwardly further than the other plunger and hence will be moved inwardly before the other to provide delivery of fuel at a reduced rate.

Abstract: A rotary drive fuel pump includes a rotary distributor member including a head, in which is located a reciprocable plunger. A ring surrounds the head and has a circumferential recess in which is located a roller. A follower is engaged with the plunger and is engageable with the roller to effect inward movement of the plunger. The roller rolls in the recess after maximum inward movement has taken place to allow rapid outward movement of the plunger.

Abstract: A fuel pumping apparatus includes a rotary distributor member mounting pumping plungers. The apparatus includes a chamber to which liquid can be supplied to vary an operating characteristic of the apparatus. A flow passage is provided through which liquid can flow to the chamber and a valve constituted by a port and grooves is provided so that liquid can be supplied to the space at specific times only during the rotation of the distributor member. An on/off valve is provided to control the flow of liquid through the flow passage.

Abstract: A fuel injection pump of the rotary distributor type has a main pumping chamber including a bore in which is located a plunger and an auxiliary pumping chamber including a further bore and a further plunger. Speed responsive valve means is provided which connects the two bores together for starting purposes. In order to permit air to escape from the bores a spill passage is connected by a passage to the further bore and the spill passage is brought into communication with a spill port while fuel is being supplied to the bores.

Abstract: A liquid fuel injection pumping apparatus has a rotary distributor member in which is formed at least two bores which intersect and contain plungers. The plungers are moved inwardly by a cam and their ends are shaped to fit together so as to reduce the volume of fuel at their maximum extent. In order to maintain the alignment of the plungers each is provided with a slot which receives a disc-like member to maintain the relative alignment of the plungers throughout their stroke.

Abstract: A fuel injection pump is provided with an improved spill control mechanism to accurately supply a desired fuel charge to an internal combustion engine. The fuel pump includes a rotor having a charge pump for pressurizing measured charges of fuel for delivery to the engine and a cam ring adapted to rotatably receive the rotor and to actuate the charge pump upon rotation of the rotor. The cam ring is angularly adjustable to control the timing of the pressurized fuel delivery to the engine. A spill collar mounted adjacent to the cam ring and adapted to rotatably receive the rotor includes a spill port for diverting fuel flow from the charge pump upon registration of a spill passage in the rotor with the spill port in the collar. A pivotal crank mounted on the cam ring and engageable with the spill collar is provided for adjusting the angular position of the spill collar relative to the cam ring to control the amount of fuel diverted from the charge pump.

Abstract: A fuel injection pumping apparatus comprises a rotary distributor member having a bore containing a plunger which is moved inwardly to cause delivery of fuel by the apparatus by cam lobes formed on the internal surface of a cam ring. The cam lobes are regularly spaced but in order to balance the forces acting on the distributor member the bore houses a further plunger which is held against outward movement by means of a roller which engages the internal surface of a pair of stop rings mounted in the housing of the apparatus.

Abstract: A fuel injection pump of the rotary distributor type having opposed fuel pumping pistons housed within a rotor and actuated by an internal ring cam. Fuel distribution, metering and timing control are effected through ports and slots associated with the rotor, the pump housing and a spill sleeve. The angular position of the cam is varied automatically in accordance with changes in engine speed as are the relative positions of certain ones of said ports and slots to provide an automatic advance of the fuel injection timing. The pump is particularly suited for electronic governing, electronic timing control and electronic control of rate of injection.

Abstract: A fuel injection pump of the rotary distributor type including a pump plunger the outward movement of which can be limited by an angularly adjustable stop ring to determine the maximum amount of fuel supplied by the pump. The stop ring is moveable from a first position to a second position to enable the pump to supply an excess amount of fuel for starting the engine. A first torsion spring biases the stop ring to the first position and a second torsion spring biases the ring to the second position and is stronger than the first torsion spring. Means is provided to remove the force exerted by the second torsion spring when the supply of the extra amount of fuel is no longer required. This means can be a fluid pressure operable piston.

Abstract: A distributor injection pump for diesel engines is disclosed. The pump includes a hydraulically balanced distributor head housing the moving parts of a cam actuated opposed piston injection pump rotatably driven in synchronization of the engine. A single solenoid valve disposed along the spill path of the injection pump controls the timing and duration of the fuel injection pulses generated at each of the pump's distributor output ports.

Abstract: A fuel injection pumping apparatus comprises a rotary distributor member mounting a pumping plunger in a transverse bore. A cam ring is provided to impart inward movement to the plunger as the distributor member rotates and the cam ring is movable angularly in accordance with speed by a fluid pressure operable device. Stop rings are mounted on the opposite sides of the cam ring and these are angularly adjustable to alter the allowed outward movement of the plunger. The stop rings are connected by a bridging member mounting a peg. The peg mounts a lever having a cam surface engageable with a stop member and the lever is movable by means of the cam ring so that the setting of the stop rings varies with speed.

Abstract: A liquid fuel injection pumping apparatus includes a rotary distributor member housed in a sleeve mounted in a body. The distributor member is movable in an axial direction and mounts a pumping plunger in a transverse bore. An inclined surface is formed on the plunger for co-operation to limit the outward movement of the plunger, with an inclined surface on a part in the form of a strip. The strip rotates with the distributor member but is restricted against axial movement. Hence axial movement of the distributor member varies the amount of outward movement of the plunger and hence the amount of fuel which can be supplied by the apparatus.

Abstract: In a distribution type fuel injection system, the fuel injection advance angle, or the relative angular position at which fuel injection begins, is controlled by a first spring loaded piston (44). The spring force is opposed by pressurized fuel from a pump (14), the pressure increasing with engine speed. A second spring loaded piston (49) moves the first piston (44) to an advanced position for starting the engine and is retracted when the fuel pressure reaches a certain value to subsequently retard the advance angle in an idling speed range. The fuel pressure moves the first piston (44) to progressively advance the angle in a higher speed range. An electromagnetic valve (62) is controlled to trap fuel and apply a hydraulic lock to the second piston (49) during starting of the engine to prevent retarding of the advance angle until the engine speed or coolant temperature reaches a predetermined value.

Abstract: A fuel pumping apparatus includes a slide member which can be engaged with an arm of a throttle which controls the flow of fuel to an injection pump of the apparatus. The slide is moveable by an operator to cut off the supply of fuel to the associated engine. A tumbler lock mechanism is mounted in a housing of the apparatus and is connected to an arm which can engage a production on the slide member to move and/or retain the slide member to the position in which supply of fuel to the engine is prevented.

Abstract: A fuel pumping apparatus includes an injection pump and means for controlling the quantity of fuel delivered by the pump. A two speed governor including an operator adjustable control is provided to determine the setting of said means. Stop means is provided to determine the maximum amount of fuel which can be supplied by the injection pump and this is movable from a first position in which an excess of fuel can be supplied for starting purposes to a second position in which the normal maximum amount of fuel can be supplied. The stop means is moved to said first position when the operator adjustable control is moved to the engine idling position but is moved to said second position as the operator adjustable control is moved away from the idling position.

Abstract: A rotary fuel injection pump with a charge pump piston limit mechanism having wear compensation means for maintaining the predetermined stroke limit setting of the charge pump pistons.

Abstract: A rotary fuel injection pump with pump plunger stroke regulating means provided by an axially adjustable abutment slide for each plunger for limiting its outward stroke in accordance with the axial position of the abutment slide established by the angular position of a control ring.

Abstract: A fuel pumping apparatus includes an injection pump which is supplied with fuel through a passage from a feed pump. A throttle member having a groove is angularly adjustable to determine the rate of fuel flow. For this purpose the groove has variable communication with a port at the end of the passage. The throttle member has a further groove which when the throttle is closed to prevent fuel flow to the injection pump, places the port in communication with a further port connected to a low pressure. This allows fuel to be expelled from the injection pump so that delivery of small amounts of fuel to the engine does not occur when the throttle is closed.

Abstract: A liquid fuel pumping apparatus includes a plunger and a piston which together are moved inwardly by cam means to deliver excess fuel for starting an engine, the plunger only being effective to supply fuel to the engine when the latter has attained a predetermined speed. The piston constitutes a valve to permit fuel and any air contained within the cylinder to escape from the cylinder during the initial inward movement of the piston.

Abstract: A liquid fuel injection pumping apparatus for supplying fuel to an internal combustion engine comprises an injection pump to which fuel is supplied by a fuel pump. An air/fuel separator is provided and also a valve including a spring loaded piston for controlling the output pressure of the feed pump, the separator being connected to the outlet of the feed pump and the piston being subject to the output pressure of the pump. A space is defined in the pump housing and from which fuel can be drawn by the feed pump when the output pressure of the feed pump falls due to the entry of air into the feed pump. The air/fuel separator has a restricted outlet through which air and fuel can flow to an outlet in the housing and the space has an outlet which is placed in communication with the feed pump inlet by the piston.

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 rotary distributor fuel injection pumping apparatus has a rotary distributor member rotatable within a sleeve forming part of the body of the pumping apparatus. The distributor member includes a transverse bore which carries plungers movable inwardly by cam surfaces on a cam ring, as the distributor member rotates. The distributor member is movable axially in the body to vary the amount the plungers can move outwardly and therefore the amount of fuel delivered by the apparatus. The extent of outward movement is determined by complementary inclined surfaces formed on cam followers associated with the plungers and a part rotatable with the distributor member but axially fixed in the body.

Abstract: A fuel pumping apparatus includes an injection pump to which fuel is supplied by a low pressure supply pump. A shuttle located in a cylinder has one end connected to the injection pump and the other end to the supply pump when it is desired to feed fuel to the engine. The movement of the shuttle represents the amount of fuel supplied to the injection pump and this movement is measured and the signal supplied to a processing circuit which also receives a demand signal. The movement of the shuttle is halted by the gradual closure of communication between the one end of the cylinder and the injection pump. This is achieved in the example by a passage moving out of registration with a port. The rate of flow of fuel from the pump to the cylinder is controlled by a fuel control device the setting of which is determined by the processing circuit which strives to ensure that the actual amount of fuel supplied to the injection pump is equal to the desired amount.

Abstract: A pumping apparatus has a body part including an inner sleeve and an outer sleeve. A passage is formed in the sleeve with the portion of the passage in the outer sleeve being threaded to receive a pipe fitting. Grooves are machined in the outer sleeve about the passage to reduce the stressing of the outer sleeve when the fitting is tightened.

Abstract: This invention relates to fuel injection pumps of the type employed for supplying measured charges of fuel to the nozzles of an associated internal combustion engine. More particularly, the invention relates to such fuel pumps of the rotary distributor type having pumping plungers which are slidably mounted in radial bores of a rotary distributor and are surrounded by a generally circular cam ring having pairs of inwardly directed cam lobes which actuate pairs of pumping plungers inwardly simultaneously for pressurizing the charge of fuel between the plungers to a high pressure.The subject invention overcomes the above problems by angularly spacing a pair of pumping plungers and the cooperating cam lobes as required for the specific engine application and avoids the undesired side loading by creating a hydraulic counterbalancing force which automatically changes as the side loading created by the reaction forces between the cam lobes and the pumping plungers changes with speed and rate of delivery of fuel.

Abstract: A liquid fuel pumping apparatus for supplying fuel to a compression ignition engine comprises a rotary distributor member which contains a transverse bore housing a pair of main pumping plungers. The main plungers are moved inwardly by cam lobes formed on the internal peripheral surface of the cam ring, there being a plurality of pairs of such cam lobes. Also provided is a further pair of pumping plungers of smaller diameter and these are actuated by another of the pair of cam lobes slightly in advance of the actuation of the main pumping plunger. Pilot injection is provided by the smaller pair of 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: Designs for variably controlling the maximum quantity of fuel which can be delivered by a pumping stroke of pumping plungers are disclosed. These include combinations of resilient and rigid leaf spring arrangements for controlling the maximum pumping stroke with and without speed responsive control valves or cams, to provide excess fuel for starting and for shaping the maximum fuel delivery curve according to speed.

Abstract: A fuel system for a multi-cylinder engine comprises a plurality of injection nozzles mounted on an engine to direct fuel into respective combustion spaces of the engine. Each nozzle incorporates a resiliently loaded pressure actuated valve member which controls the flow of fuel through an outlet from a fuel inlet. A fuel pump is provided for supplying fuel to the inlets in turn. Pilot pumps incorporated in the nozzles respectively cause a small volume of fuel to be delivered through the respective outlets in advance of the main volume of fuel.

Abstract: A rotary distributor fuel pump for an engine is provided with a piston driven by an eccentric bore of a rotating assembly for pressurizing fuel communicated thereto. A rotor is provided for varying both volumetric flow as well as timing of fuel injected to the engine. The rotor is rotated at a speed proportional to the rotational speed of the rotating assembly. Volumetric flow is achieved by a change in the axial position of the rotor. Control of timing can be achieved by changing the rotative position of the rotor relative to the rotating assembly.

Abstract: A fuel injection pump for internal combustion engines, comprising a rotor formed with at least one transverse cylinder-shaped bore in which are slidably mounted two pumping plungers. An inward movement is imparted to the plungers, as the rotor rotates, by cam lobes formed on the inner periphery of a fixed ring and acting on the plungers via respective rollers.The axis of the bore and the rotor's axis of rotation do not intersect each other, the distance between these two axes being such that the rollers are simultaneously engaged by two cam lobes and the distance is minimum under this condition.