Fuel injection pump

Claim 1

In a fuel injection pump for an internal combustion engine including: a housing; at least one pump piston in said housing; a cam drive arranged in the housing to produce the fuel feeding stroke of the at least one pump piston; means producing a return force; and an adjustable piston connected to the return force producing means and to the cam drive, said cam drive including a rotatable part, with said cam drive being rotatable relative to the direction of rotation of the rotatable part for adjusting the timing of the beginning of the fuel injection by means of the adjustable piston which is acted upon by an rpm-dependent pressure against the return force of the return force producing means, the improvement comprising a control unit mounted to said housing for directly engaging the adjustable piston, said control unit comprising: an adjustable stop member directly engageable with the adjustable piston; a temperature sensitive device acting on the adjustable stop member; further means for producing a return force; and a mounting structure in which the temperature sensitive device and the further means are mounted, said temperature sensitive device and said further means being operatively interposed between said adjustable stop member and said mounting structure, whereby from engine starting to engine warm-up, the temperature sensitive device varies the position of the adjustable stop member and consequently the adjustable piston in a direction to advance the beginning point of injection.