Distributor injection pump for diesel engines

In a distributor fuel injection pump for an internal combustion engine having a housing, an inlet port, a return port, a shaft adapted to be rotatably driven in synchronization with the engine and an injection pump connected to said shaft for producing a fuel flow at an outlet an improvement characterized by:

• a distributor block enclosing one end of housing normal to the axis of said shaft, said distributor block having a plurality of injection ports adapted to be connected to the individual cylinders of the engine;
• said injection ports symetrically disposed along the circumference of a circle concentric with the axis of said shaft;
• a bearing block disposed in the housing for supporting said shaft;
• a distributor head connected to said shaft and rotatable therewith, said distributor head housing at least the moving elements of said injection pump and having a first face adjacent to said distributor block and an opposite face adjacent said bearing block said first face having a distributor port offset from the axis of said shaft a distance equal to the radius of said circle and interconnecting the output of said injection pump with said plurality of injection ports, one at a time in a predetermined sequence with the rotation of the shaft each time said injection pump produces a fuel flow, said first face further including a spill port concentric with the axis of said shaft and connected to the outlet of said injection pump, said opposite face having at least one balancing port having one end connected to the output of said injection pump to produce a hydraulic force counterbalancing the forces produced at said spill and distributor ports;
• and
• a solenoid valve interconnecting said spill port with said return port, said solenoid valve having an unenergized state conducting said fuel flow through said spill port to said return port and an energized state in response to an electrical signal, blocking said fuel flow through said spill port.

A distributor fuel injection pump comprising:

• a housing having an end face, a fuel inlet port, and a plurality of injection ports disposed through said end face in a symetrical pattern about an axis of rotation;
• a shaft having one end adapted to be rotatably driven and the other end disposed within said housing;
• a bearing block disposed in said housing for rotatably supporting said other end of said shaft concentric with said axis of rotation;
• face type distributor head means disposed at the end of said shaft between said end face and said bearing block, said distributor head means having a first face adjacent to said end face and a second face adjacent to said bearing block, said first face having a distributor port sequentially connected to said injection ports, one at a time, in a repetitive sequence with the rotation of said shaft, said second face having at least one balancing port interfacing said bearing block;
• a cam actuated opposing plunger injection pump having its moving elements disposed within said distributor head means, said cam actuated opposing plunger injection pump receiving fuel from said inlet port and generating an intermittent fuel flow at an output connected to said distributor port, each time said distributor port is connected to one of said injection port, the fuel flow at said balancing port producing a hydraulic force counterbalancing the hydraulic force produced at said distributor port.