Fuel injection pump with spill and line pressure regulating systems

In a rotary fuel injection pump having a pump rotor providing a pump, body and distributor rotor in coaxial alignment, the pump body having a pumping chamber with a plurality of pumping plunger bores with axes extending radially outwardly from the axis of the pump rotor;

• a pumping plunger mounted in each plunger bore;
• a cam ring surrounding the pump body for reciprocating the pumping plungers for supplying intake charges of fuel to the pumping chamber and delivering high pressure charges of fuel from the pumping chamber for fuel injection;
• and a distributor head having a distributor rotor bore and a plurality of distributor outlet ports angularly spaced around the distributor rotor bore;
• the distributor rotor being rotatably mounted in the distributor rotor bore and having a peripheral distributor port located to register with the distributor outlet ports in sequence for distributing the high pressure charges of fuel;
• the improvement wherein the distributor rotor has a transverse connector bore with a connector inlet port trailing the peripheral distributor port and located for registry with each active distributor outlet port as the distributor port rotates out of registry with said active port and a connector outlet port located for registry with another distributor outlet port as the distributor port moves out of registry with said active port.

In a rotary fuel injection pump having an outer cam ring and inner pump body in coaxial relationship;

• the pump body having a pumping chamber with at least one diametral pumping plunger bore;
• a pair of opposed pumping plungers in each diametral pumping plunger bore;
• the cam ring and pump body being relatively rotatable for periodically actuating the pumping plungers inwardly with the cam ring for delivering high pressure charges of fuel from the pumping chamber for fuel injection;
• and a spill mechanism for spilling fuel from the pumping chamber for spill termination of the delivery of the high pressure charges of fuel;
• the spill mechanism comprising a spill valve having a coaxial valve bore in the pump body in communication with the pumping chamber and a spill valve member shiftable in the valve bore in one axial direction to a closed position thereof and in the opposite axial direction to an open position thereof for spilling fuel from the pumping chamber, means biasing the valve member in said one direction to its closed position and a valve actuating mechanism for actuating the valve member in said opposite axial direction to its open position to terminate the high pressure delivery of fuel in fixed synchronism with the inward actuation of the pumping plungers;
• the improvement wherein the spill valve member has at least one peripheral spill port with a leading spill edge in a transverse plane perpendicular to the axis of the valve member and wherein the spill port moves into communication with the pumping chamber as the spill valve is actuated in said opposite direction from its closed position to its open position.