Liquid fuel injection pumps

F - Mech Eng,Light,Heat,Weapons – 02 – M

Patent

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F02M 41/06 (2006.01) F02M 41/14 (2006.01) F02M 59/20 (2006.01)

Patent

CA 1116489

ABSTRACT OF THE DISCLOSURE A fuel injection pumping apparatus for supplying fuel to an internal combustion engine includes an injection pump comprising a pair of reciprocable plungers located in a pump and moved inwardly in timed relationship by cam lobes formed on an annular cam ring. The bore containing the plungers is connected to a delivery passage whereby fuel is delivered in turn during successive inward movement of the plunger to a plu- rality of outlet ports. Fuel is supplied to the injection pump by way of valve means from a further pump, also incor- porating a pair of reciprocable plungers movable inwardly by means of cam lobes on a cam ring. The displacement of the plungers of the further pumps is greater than that of the plungers of the injection pump and means is provided to alter the stroke of the plungers of the further pump during which fuel is supplies to the injection pump. In one example this is achieved by means of a spill port which is brought into register with the bore containing the plungers of the further pumps and in addition the cam ring of the further pump is angularly adjustable.

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