Distributor pump with floating piston single control valve

A distributor pump for controlling injection of fuel into individual cylinders of an internal combustion engine comprising:

• a housing;
• an input or drive shaft supported for rotation within said housing;
• a pressurized source of fuel;
• said housing defining a first annulus in communication with said source of fuel, a first passage communicating with said first annulus, a second and a third passage terminating at a metering annulus;
• an electromagnetic valve supported within said housing having two operational states wherein said first state controls fuel flow between said first and second passages, and wherein said second state controls fuel flow between said first and third passages;
• said housing further defining a bore having a first set of metering and discharge ports formed therein, one metering and discharge port for each cylinder;
• a timing and metering assembly fixed for rotation in said bore and rotatable with said drive shaft, having a body and a cavity formed therein, a floating piston forming a timing chamber and a metering chamber in said cavity on either side of said floating piston, said body having a metering passage formed therein for communicating said metering chamber with the exterior surface of said body, said metering passage being rotated, in succession, from a metering port to a discharge port;
• and
• cam means supported in said housing, and means supported in said assembly in engagement with said cam means for forcing fuel into said timing chamber and initiating injection.

A distributor pump for controlling injection of fuel into individual cylinders of an internal combustion engine comprising:

• a housing;
• an input or drive shaft supported for rotation within said housing;
• a pressurized source of fuel;
• said housing defining a first annulus in communication with said source of fuel, a first passage communicating with said first annulus, a second and a third passage terminating at a metering annulus;
• an electromagnetic valve supported within said housing having two operational states wherein said first state controls fuel flow between said first and second passages, and wherein said second state controls fuel flow between said first and third passages;
• said housing further defining a bore having a first set of discharge ports formed therein, one metering and discharge port for each cylinder;
• a timing and metering assembly fixed for rotation in said bore and rotatable with said drive shaft, having a body and a cavity formed therein, a floating piston forming a timing chamber and a metering chamber in said cavity on either side of said floating piston, said body having a metering passage formed therein for communicating said metering chamber with a second annulus formed on the exterior surface of said body in communication with said third passage, said metering passage being rotated, in succession, to each one of said discharge port;
• and
• cam means supported in said housing, and means supported in said assembly in engagement with said cam means for forcing fuel into said timing chamber and initiating injection.