US 4,067,304 AGranted

Fuel pumping apparatus

AssigneeLucas Industries Limited

InventorJames Charles Potter

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Abstract

A fuel pump includes a member movable angularly to determine three fuel settings when the pump is used to supply fuel to a supercharged internal combustion engine. The member is moved by a fluid pressure operable means which includes a piston connected to the further member by a pin and a sleeve in which the piston is mounted and which itself is slidable within a cylinder. Fluid under pressure can be admitted to the cylinder by way of a valve, the pressure of fluid depending upon the speed at which the apparatus is driven. A spring is provided to bias the piston and sleeve so that the further member assumes a first position. When fluid pressure is applied the sleeve and piston move the further member to a second position after which further movement of the sleeve is halted so that the pressure in the cylinder must rise appreciably before the piston alone can move the further member to its third position.

Claims17

Dependent claims

A fuel pumping apparatus for supplying fuel to internal combustion engines and comprising a pumping plunger movable inwardly within a bore to displace fuel from the bore to a fuel outlet, pump means for supplying fuel to the bore to urge the plunger outwardly, valve means for controlling the output pressure of said pump means so that it varies in accordance with the speed at which the apparatus is driven, control means operable to control the amount of fuel supplied to the bore, a cam for effecting inward movement of the plunger, stop means operable to determine the maximum outward movement of the plunger thereby to limit the maximum amount of fuel which can flow through said outlet irrespective of the setting of said control means, said stop means comprising a stop member movable to determine the outward movement of the plunger, a further member movable between three positions and co-operating with said stop member so that in the first of said positions excess of fuel may be supplied by the apparatus, in the second of said positions the maximum amount of fuel for low engine speeds may be supplied by the apparatus and in the third of said positions the maximum amount of fuel for higher engine speeds may be supplied by the apparatus, said apparatus including fluid pressure operable means for moving said further member between said three positions, said fluid pressure operable means being responsive to the output pressure of said pump means.

Dependencies are inferred from the claim text.