Lucas Industries Limited

Lucas Industries Public Limited Company

Robert T Skinner

Dorian F Mowbray

Brian W Tumber

John R Jefferson

Brian E Broadwith

Reginald Hollett

John W Clegg

A fuel injection nozzle of the inwardly opening type includes first and second coiled compression springs operable to load the valve member to the closed position. The first spring is initially opposed by the second spring and finally assisted by the second spring during the movement of the valve member there being an intermediate range of valve member movement during which the first spring alone resists the movement of the valve member.

Fuel injection nozzles

A fuel injection nozzle for supplying fuel to an internal combustion engine includes a valve member biased by a spring to a closed position and movable to an open position by fuel under pressure supplied to an inlet of the nozzle. The opening of the valve member is initially assisted by fuel under pressure supplied to an inlet of the nozzle. The opening of the valve member is initially assisted by fuel under pressure acting upon a piston. A stop limits the movement of the piston so that the remaining movement of the valve member is due only to the fuel pressure acting on the valve member.

A fuel injection nozzle for supplying fuel to an internal combustion engine is of the outwardly opening type and includes a valve member which is biased by a first spring to the closed position, a second spring is provided and is arranged so that it initially opposes the first spring and finally assists the first spring there being a range of movement of the valve member against the action of the first spring only.

Fuel injection nozzle

A fuel injection nozzle for supplying fuel to an internal combustion engine includes a valve member slidable within a bore in a nozzle body. The valve member has a drilling in which is slidable a sleeve member. The sleeve member is in end to end sealing engagement with a tubular member through which fuel can flow from a fuel inlet to an outlet when the valve member is lifted from a seating.

A fuel injection pump includes a rotary distributor having a bore housing a pair of pumping plungers which are actuated by a cam. The distributor member also carries a valve member which is actuated by a cam. The valve member has a groove which can spill fuel to a drain when the valve member is moved to an operative position. In addition the valve member restricts the backflow of fuel from an outlet when fuel is spilled from the bore.

Fuel injection pumps

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.

Fuel injection pumping apparatus

A fuel injection nozzle for supplying fuel to a compression ignition engine includes a valve member slidable within a bore, a seating in the bore and the valve member being shaped to co-operate with the seating. An extension is carried by the valve member and is slidable in a guide bore extending from the seating to the exterior of the nozzle. The extension has an outlet chamber into which opens a first passage through which fuel can flow as soon as the valve member is lifted from the seating and a second passage through which fuel can flow with increasing quantity as the valve member lifts from the seating. The first passage causes swirling of fuel in the chamber and produces a bushy fuel spray and the fuel flowing through the second passage progressively cancels the swirling to produce a penetrative jet of fuel.

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. In order to avoid an increase in the amount of fuel supplied a pressure responsive valve is provided which is responsive to the output pressure of the low pressure pump and which closes to prevent fuel flow to the injection pump when the pressure falls below a predetermined value.

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.

A fuel injection pumping apparatus includes a governor which controls the size of an orifice through which fuel is supplied to an injection pump to determine the amount of fuel supplied by the pump to an associated engine. The governor includes a piston which at one end is subjected to fuel pressure and which bears at its other end against a spring connected in series with a spring. The spring is weaker than the spring so that at idling speed it is the spring which balances the force acting on the piston. Manually operable means is provided to effect movement of an abutment disposed between the springs, the spring acting to determine the maximum speed of the associated engine. When the engine has been started from cold, it is desirable to provide additional fuel to enable the engine to idle properly and for this purpose a device represented by the arrow, moves the end of the spring remote from the spring and this provides a temporary increase in the amount of fuel supplied at idling speeds.

A fuel injection nozzle includes a body defining a bore to which fuel can be supplied. The bore defines a guide portion of reduced diameter at its outer end and the guide portion supports a valve member for axial movement. The valve member has an outlet orifice formed therein. The orifice in the closed position of the valve member is closed by the guide portion and is uncovered to the bore to allow fuel flow as the valve member is moved by fuel under pressure.

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.

Liquid fuel pumping apparatus

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.

Fuel pumping apparatus

A liquid fuel injection pumping apparatus includes a plunger movable inwardly in a bore to deliver fuel, by the action of a roller and a cam. An adjustable stop ring is provided to limit the extent of outward movement by the plunger and hence the maximum amount of fuel which can be supplied to the associated engine. The ring is positioned by a piston upon which liquid under pressure can act. The liquid under pressure is supplied by a low pressure pump and is admitted to one end of a cylinder containing the piston through a restrictor. The pressure downstream of the restrictor is controlled by a valve which includes a valve member spring biased into contact with a seating against the action of the pressure downstream of the restrictor. The air pressure in the engine inlet manifold is applied to a diaphragm and the force developed assists the action of the spring biasing the valve member.

Liquid fuel injection pumping apparatus

A fuel injection pumping apparatus includes a piston located within a cylinder. The piston is connected to an annular cam ring of a rotary distributor type fuel pump to adjust the timing of delivery of fuel. A passage conveys fluid under pressure to act on the piston to move the piston against the actions of a spring. The passage includes a check valve to prevent movement of the piston and cam ring when a pump plunger is moved inwardly by a cam lobe on the cam ring and a further check valve which prevents movement of the piston and cam ring when the plunger is allowed to move outwardly by the cam lobe.

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High Wycombe, United Kingdom

Robert T Skinner