Fuel injection pump for internal combustion engines with exhaust gas recirculation

Claim 1

A fuel injection pump for internal combustion engines with exhaust gas recirculation, having an electrical control element, actuated in accordance with load, for completing or controlling an electrical circuit for controlling an exhaust gas recirculation valve, which comprises a housing, a fuel suction chamber (7) in said housing, a cylinder (2) formed in said housing, a pump piston (4) driven such that said pump piston simultaneously reciprocates and rotates in said cylinder (2), a pump work chamber (5) formed in said cylinder between one end of said pump piston and said housing, a relief conduit (15) extending axially within said pump piston from said work chamber and having a blind bore and communicating permanently with the pump work chamber and outlet from said relief conduit juxtaposed said blind bore, a governor slide (21) that surrounds the pump piston in said suction chamber (7) subjected to fuel pressure and adjustable in accordance with load, said governor slide adapted to close said outlet (A) of the relief conduit during a variable portion of a stroke course of said pump piston, a second conduit (25) disposed in said pump piston (4), said second conduit including an inlet (E) and an outlet (B with its inlet (E) disposed in an operative range of the governor slide (21) spaced apart from the outlet (A) of the relief conduit (15), such that the inlet (E) of the conduit (25) is opened only whenever the outlet of the relief conduit is open, a line (29, 30) in said housing that communicates with said outlet (B) that leads to a blind bore (31), a control element (35) that communicates with said blind bore (31), said control element operated by a pressure force and a relief line (32, 33) that connects with said blind bore (31).