Lucas Industries Public Limited Company

Lucas Industries Limited

Christopher Stringfellow

Peter A Collingborn

Michael Peter Cooke

Godfrey Greeves

Ronald Phillips

George Nicholas Felton

Kenneth M Harris

Stuart W Nicol

Derek W Tomsett

Paul Raymond Smith

Christopher Matthew Moore

Paul Francis Garland

An injector includes a nozzle body having a bore and defining a seating, and a fuel flow path along which fuel flows, in use, towards the seating. A needle is slidable through a range of movement within the bore, and engagable with the seating to control fuel flow to an outlet aperture. The needle includes a thrust surface against which fuel at high pressure acts, in use, to lift the needle from its seating. The bore and needle together define a restriction to the flow of fuel along the fuel flow path towards the seating. The restriction is located upstream of the thrust surface, and the restriction is arranged to restrict the rate of flow of fuel towards the seating throughout the range of movement of the needle. In a preferred embodiment, the restriction is arranged such that the rate of fuel flow towards the seating through the restriction varies as the needle separates from the seating.

Injector

A fuel system is described which comprises a high pressure fuel pump arranged to supply fuel under pressure to a plurality of injectors. A backleak connection line is arranged to return fuel from the injectors to a fuel reservoir. A venturi pump is connected to the backleak connection line and is arranged to draw fuel from the line to reduce the fuel pressure therein.

Fuel system

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.

Fuel pumping apparatus

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.

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.

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Sittingbourne, United Kingdom

Christopher Stringfellow