Importance

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Abstract

A fuel injection pump having a fixed pump body with a pumping chamber having a plurality of plunger bores, a plunger mounted in each plunger bore for reciprocation, a cam rotatable for reciprocating the plungers to periodically supply an intake charge of fuel to the pumping chamber and deliver a high pressure charge of fuel from the pumping chamber for fuel injection and to sequentially position the plungers in distributor valve positions thereof to deliver the high pressure charges of fuel, via distributor ports in the plunger bores, to a plurality of distributor outlets. In one version of the pump, the plunger bores are angularly spaced about and extend radially inwardly to a central coaxial bore, the rotary cam is an annular cam which actuates the plungers inwardly to deliver the high pressure charges of fuel, and a poppet valve is mounted in the central coaxial bore to supply fuel to and spill fuel from the pumping chamber. A pressure regulator has a fuel inlet opening in axial alignment with the poppet valve and which is closed by the poppet valve in its open position to increase the rate of fuel supply to the pumping chamber.

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First Claim