Fuel injection pump

Claim 1

In a fuel injection pump having at least one pump work chamber enclosed by a pump piston in a pump cylinder, fuel distributing means for connecting the pump work chamber with at least one fuel injection location and fuel supply means for connecting the pump work chamber with a fuel supply in order to establish the fuel injection quantity wherein the fuel supply means includes a fuel supply line of the pump work chamber, a fuel supply pump for supplying fuel to the fuel supply line, a pressure control means for adjusting the supply pressure of the fuel supply pump, a valve disposed in the fuel supply line, and an electric control means for controlling the actuation of the valve, the improvement wherein: the valve comprising a piston slide stressed by a restoring spring, a first end face of the piston slide defining a first pressure chamber which is continuously exposed to the supply pressure of the fuel supply pump and the piston slide having a control edge for controlling the passage of the fuel supply line to the pump work chamber; the electric control means includes first and second electrically actuatable valves disposed in parallel lines for connecting the fuel supply line with the supply side of the fuel supply pump; the pressure control means comprises a first pressure control valve for relieving pressure in the fuel supply line downstream of the two electrically actuatable valves; wherein the fuel distributing means comprises a distributor rotating within a distributor cylinder connected with the at least one pump work chamber, the distributor having a circumferential surface defining a distributor groove and an annular groove for establishing communication between the distributor groove and the pump work chamber, wherein by means of which rotating distributor the pump work chamber is connected via the distributor groove one after another with individual injection lines leading to respective injection locations during the supply stroke of at least one pump piston; the piston slide of the valve is disposed in a cylinder inside the distributor; the piston slide with its control edge controls connecting bores between the annular groove on the distributor and the cylinder inside the distributor; the cylinder inside the distributor downstream of the control edge communicates continuously with the fuel supply line; and the first pressure chamber enclosed by the first end face of the piston slide in the cylinder communicates continuously with the supply side of the fuel supply pump.