Abstract: A fuel injection pumping apparatus includes a stepped body with a nozzle head mounted at the narrower end and an electromagnetic actuating means located in the wider end. A pumping plunger is mounted in a bore in a valve mounting having a flange located against the step defined between the wider and narrower portions of the body. The mounting also carries valve element having a head which is spring biased into contact with a seating. The valve element is engaged by the plunger towards the end of its movement to terminate flow of fuel from the nozzle.

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: An electromagnetic device comprises an outer annular member and an inner member, the two members each having a helical rib on their presented surfaces. Two presented side faces of the ribs define working surfaces and on one of the working surfaces is defined a groove which extends the length of the rib and the groove accommodates an electrical winding which when energized creates a pair of magnetic poles on the one working surface. The magnetic circuit of the poles includes the other working surface and the two surfaces move towards each other to reduce the magnetic reluctance thereby causing relative movement of the members.

Abstract: A fuel injector has a chamber into which fuel leaking from within the injector can flow. A collar surrounds a body part of the injector and defines with the body a cavity into which fuel from the chamber can flow. The collar is secured to the body part by a circlip and the collar has nipples to lead fuel away from the cavity.

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: The invention relates to a valve control arrangement for controlling the flow of exhaust gas from an exhaust manifold to an air inlet of an internal combustion engine which is supplied with fuel by a fuel pump. The quantity control member of the pump is connected through linkage to a valve through which exhaust gas can flow into a conduit connected to the air inlet manifold. In this manner the quantity of exhaust gas recirculated depends upon the setting the control member of the pump. A further valve is positioned upstream so far as exhaust gas is concerned, of the valve and the further valve is adjusted so that it maintains the pressure drop across the first mentioned valve substantially constant. This is achieved in the example, by means of a diaphragm opposite sides of which are responsive to the pressure on opposite sides of the first mentioned valve.

Abstract: A compression ignition engine is provided with the usual injection pump to deliver fuel to the engine cylinders. A constant vacuum carburettor is provided in the air inlet manifold of the engine to enable an alternative fuel to be mixed with the air flowing to the engine. The carburettor includes a jet and needle which are both movable to control the amount of alternative fuel supplied to the engine. The needle is controlled in accordance with the rate of air flow to the engine while the jet is controlled in accordance with the amount of fuel supplied by the injection pump to the engine.

Abstract: A fuel injection nozzle has a valve member biased to the closed position by a spring and a piston housed in a bore connected to the inlet of the nozzle by way of a non-return valve. A space between the piston and valve member is vented to a drain. In order to minimize leakage of fuel, the piston and the bore in which it is located define a groove which is connected to the fuel inlet so that any fuel leaking from the end of the piston subjected to the pressure of fuel at the inlet collects in the groove and returns to the inlet when the pressure of fuel at the inlet falls.

Abstract: A fuel injection nozzle unit includes a plate in which is formed an orifice through which fuel can flow to be mixed with air flowing to the engine. The plate defines a surface for engagement by a disc-like valve member formed from magnetizable material and which is urged into contact with the surface by fuel under pressure which may be assisted by a spring. A core member has a face presented to the aforesaid disc and in which is formed a plurality of grooves extending about the aforesaid outlet. The grooves accommodate electrical windings which are connected in such a manner that the current flow in the windings in adjacent grooves, so that the face of the core presented to the disc forms a series of pole pieces of opposite magnetic polarity. The magnetic field moves the disc away from the aforesaid surface to permit flow of fuel through the outlet.

Abstract: A fuel pumping apparatus for supplying fuel to a compression ignition engine comprises a rotary distributor located within a housing and having a transverse bore mounting a pair of plungers which are driven inwardly as the distributor rotates, to displace fuel through an outlet. The apparatus includes a pilot pump including a plunger which is operable by actuating means to displace fuel from a pilot pump chamber in advance of the delivery of fuel by the main plungers. The displacement of fuel by the pilot plunger effects an initial supply of fuel to the engine for the purpose of pilot injection.

Abstract: A fuel injection pumping apparatus includes an angularly adjustable cam ring having cam lobes which co-act with rollers to effect inward movement of a pumping plunger. The cam ring is connected to a piston which due to the reaction of the rollers with the cam lobes, develops a pressure acting on a plunger element. The plunger element is spring loaded and when the pressure exceeds a predetermined value the cam ring will be allowed to move angularly to adjust the injection characteristic of the pump.