Fuel distribution injection pump for internal combustion engines

A fuel distribution injection pump for internal combustion engines comprising a pump plunger guided within a pump cylinder with one end projecting into a driving gear area which is filled with lubricant via a lubricant infeed and drain;

• a driving gear arranged in said driving gear area, which converts a rotation of a drive shaft into a reciprocating and simultaneous rotational movement of the pump plunger;
• a pump chamber formed by said pump plunger and said pump cylinder, a distribution hole arranged radially in the pump plunger, said distribution hole is linked to the pump chamber via an axial hole in the pump plunger and which, during a compression stroke of the pump plunger and as a consequence of a rotational motion of the pump plunger, said distribution hole links up with distribution channels in the pump cylinder, one channel at a time, which lead to injection valves;
• a magnetically operated valve which is linked to a fuel feed line PG,12 and to the pump chamber, for a control of a fuel injection quantity as delivered by the pump plunger to the injection valves, a fuel reservoir 38, limited by a membrane 37, of a membrane reservoir (23) is arranged in a fuel flow link (24, 25) between the magnetically operated valve (21) and the fuel feed line (40);
• at least one relief hole (28) is provided within the pump plunger (20) diametrically thereof, the distribution hole (27) terminates in the axial hole (26) and during rotation of the pump plunger (20) links up with filling holes (30) in the pump cylinder (19), and the filling holes (30) are linked to the fuel reservoir (38) of the membrane reservoir (23) and are arranged within the pump cylinder (19) in such a way that a link to the relief hole (28) is established during every intake stroke of the pump plunger (20) and is interrupted during the compression stroke thereof.