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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 hig

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.

대표청구항 ▼

In a fuel injection pump having a fixed integral body with a plurality of distributor outlets and a pumping chamber with a plurality of plunger bores, a plunger mounted in each plunger bore for reciprocation, with one end face of the plunger facing toward the pumping chamber, rotary cam means rotata

In a fuel injection pump having a fixed integral body with a plurality of distributor outlets and a pumping chamber with a plurality of plunger bores, a plunger mounted in each plunger bore for reciprocation, with one end face of the plunger facing toward the pumping chamber, rotary cam means rotatable about a cam axis for reciprocating the plungers to provide alternating intake and pumping phases of operation for respectively supplying an intake charge of fuel to the pumping chamber and delivering a charge of fuel from the pumping chamber at high pressure for fuel injection, means for supplying intake charges of fuel to the pumping chamber during the intake phases, and a delivery system for delivering the high pressure charges of fuel from the pumping chamber to the distributor outlets; the improvement wherein a plurality of the plungers serve as distributor valves in sequence, connecting the distributor outlets in sequence directly to the pumping chamber; wherein the delivery system comprises a plurality of separate distributor passages in the fixed integral body, for the plurality of distributor outlets respectively, each having a distributor port in a distributor valve bore and connecting the distributor port to the respective distributor outlet; each distributor valve having a distributor position for each respective distributor port and forming the sole means, in each distributor position thereof, opening the distributor port to the pumping chamber adjacent said one end face of the distributor valve for connecting the respective distributor outlet directly to the pumping chamber for delivering a high pressure charge of fuel from the pumping chamber, via the distributor valve bore and distributor port and respective distributor passage, directly to the respective distributor outlet; wherein a plurality of the plungers serve as pumping plungers; and wherein the rotary cam means is operable during each pumping phase to actuate at least one of the pumping plungers to deliver a high pressure charge of fuel from the pumping chamber and to position a distributor valve in a distributor position thereof to deliver the high pressure charge of fuel via the respective distributor port and distributor passage to the respective distributor outlet.