Fuel injection pump for internal combustion engines

Claim 1

A fuel injection pump for internal combustion engines comprising a housing, a suction chamber in said housing, a pump piston, a face cam disk and a roller means in said housing for simultaneously reciprocating and rotating said pump piston, an injection adjuster means for adjusting said roller means to control the instant at which a supply stroke of said piston begins, said injection adjuster means including an injection adjuster piston, a first work chamber at one end of said injection adjuster piston which communicates with said suction chamber via a throttle in said injection adjuster piston, a pressure control valve, said pressure control valve including a movable wall acted upon on one end by a restoring force in a spring chamber and on its opposite end by fluid pressure in a second work chamber, a fuel feed pump driven in synchronism with said fuel injection pump, said fuel feed pump including a pressure side which communicates with said second work chamber of said pressure control valve and said suction chamber, said movable wall of said pressure control valve adapted to control a discharge opening to a first relief line and a second relief line connected to said spring chamber, said spring chamber arranged to communicate via a throttle restriction with said pressure side of said feed pump and via a third relief line with a fuel supply container, said third relief line arranged to communicate with a first pressure limiting valve in a first branch line and a second pressure limiting valve located in a second branch line, said first pressure limiting valve mechanically coupled with an adjustable element which is coupled with one end of an idling spring with the opposite end of said idling spring coupled with a governor lever of said fuel injection pump, whereby in a closed position of said first pressure limiting valve the biasing of said idling spring is increased.