Fuel injection pump for internal combustion engines

Claim 1

A fuel injection pump for internal combustion engines, comprising: a housing (4); a fuel feed pump (16) that pumps fuel into a suction chamber (2) of said housing in proportion to rpm; an injection onset adjusting device (43) actuated in accordance with the fuel supply pressure (p f ) in the suction chamber; a pressure control valve (18) that controls the pressure in the suction chamber (2) said pressure control valve including; a movable wall (51) actuated on one end by the supply pressure (p f ) and on the other end by a restoring spring (52) in a restoring chamber (55) and a differential pressure dependent on fuel supply pressure, a pressure valve (57) including a pressure chamber (59) which communicates with said restoring chamber (55) of the pressure control valve (18) and which varies the fuel pressure in the suction chamber additionally in a function of at least one operating variable, in particular the engine temperature; a governor lever (7) actuating an injection quantity adjusting member (8) of the fuel injection pump and an adaptation device (30) which includes an adaptation control member (31), movable by supply pressure on one end and by a restoring pressure on the other end for the full-load stop for establishing a maximum permissible full-load supply quantity, the restoring force at the control member being generated by an adaptation spring (38) and a pressure (p a ) in the adaptation chamber (37) of the adaptation device which pressure p a is made to differ from the supply pressure and an adjustable full-load stop operative by said adaptation device, the pressure (p a ) in the adaptation chamber (37) of the adaptation device (30) is made to differ from the pressure (p b ) in the restoring chamber of the pressure control valve and in the pressure chamber (55) of the pressure valve by means of a first throttle device (70), and when the pressure valve (57) is closed in order to increase the pressure in the suction chamber (2), the pressure (p b ) in the restoring chamber (55) of the pressure control valve (18) and the pressure (p a ) in the adaptation chamber (37) of the adaptation device (30) are adjustable by means of a second throttle device (75) in a fuel return line (54).