Distributor type fuel injection pump

In a fuel injection pump having a fixed pump body with a pumping chamber with a plurality of plunger bores angularly spaced around and having axes extending generally radially outwardly from a cam axis, a plunger mounted in each plunger bore for reciprocation, annular cam means surrounding the plungers and rotatable about the 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, valve means selectively operable for supplying an intake charge of fuel to the pumping chamber during the intake phase and spilling fuel from the pumping chamber during the pumping phase, a plurality of distributor outlets 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;
• wherein the delivery system comprises a plurality of distributor ports for the plurality of distributor outlets respectively, each in a distributor valve bore, for connecting the bore to the respective distributor outlet;
• each distributor valve having a distributor position for each respective distributor port for opening the distributor port for delivering a high pressure charge of fuel from the pump chamber via the distributor port to the respective distributor outlet;
• wherein the annular cam means and plungers cooperate to distribute the high pressure charges of fuel form the pumping chamber via the distributor ports to the distributor outlets;
• wherein the pump body has a central coaxial valve bore, wherein the plunger bores extend radially inwardly to the central valve bore, wherein the plunger bores intersect at their inner ends to form ports in the pump body interconnecting the plunger bores, wherein the pumping chamber is formed substantially entirely by the plunger bores and wherein the valve means comprises a valve member axially shiftable in the valve bore between open and closed axial position thereof.

In a fuel injection pump having a pump body with a pumping chamber with a plurality of plunger bores angularly spaced around and having axes extending generally radially outwardly from a central axis, a plunger mounted in each plunger bore for reciprocation, annular cam means surrounding the plungers, the annular cam means and pump body being relatively rotatable about the central 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, a plurality of distributor outlets and a system for delivering the high pressure charges of fuel from the pumping chamber to the distributor outlets, the pump body having a central coaxial bore providing a valve bore intersecting the angularly spaced plunger bores and an annular, coaxial valve seat between the intersection of the valve bore and plunger bores and one end of the central coaxial bore, a valve member having a sealing head at one end thereof and extending axially toward the other end of the central coaxial bore, the valve member being axially shiftable in the valve bore between a closed position thereof with its sealing head in engagement with the valve seat and an open position thereof with its sealing head spaced from the valve seat to form an annular valve opening therebetween, and valve actuating means for shifting the valve member between its open and closed position;

• the improvement wherein the central coaxial bore is a throughbore, wherein the valve actuating means comprises an electromagnet having a transverse armature plate fixed to the valve member at the other end of the valve member from the sealing head and a stator contiguous to and in axial alignment with the armature plate, the stator being operable when the electromagnet is energized to attract the armature plate in one axial direction toward the stator to shift the valve member to one of its said positions and spring means biasing the valve member in the opposite axial direction to shift the valve member to its other position when the electromagnet is deenergized.

In a fuel injection pump having a pump body with a pumping chamber with a plurality of plunger bores angularly spaced around and having axes extending generally radially outwardly from a central axis, a plunger mounted in each plunger bore for reciprocation, annular cam means surrounding the plungers, the annular cam means and pump body being relatively rotatable about the central 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, a plurality of distributor outlets and a system for delivering the high pressure charges of fuel from the pumping chamber to the distributor outlets, the pump body having a central coaxial bore providing a valve bore intersecting the angularly spaced plunger bores and an annular, coaxial valve seat between the intersection of the valve bore and plunger bores and one end of the central coaxial bore, a valve member having a sealing head at one end thereof and extending axially toward the other end of the central coaxial bore, the valve member being axially shiftable in the valve bore between a closed position thereof with its sealing head in engagement with the valve seat and an open position thereof with its sealing head spaced from the valve seat to form an annular valve opening therebetween, and valve actuating means for shifting the valve member between its open and closed positions;

• the improvement wherein the central coaxial bore is a throughbore, wherein the fuel injection pump comprises a fuel chamber, with a regulated fuel pressure, in axial alignment with the valve member axially outwardly of said one end of the valve member, wherein the valve member has a coaxial bore with an end opening at said one end thereof in continuous communication with said fuel chamber, wherein said annular valve opening, with the valve member in is open position, connects the pumping chamber to said fuel chamber, and wherein the valve actuating means is mounted at the other end of the valve member from said sealing head.