R.p.m. regulator for fuel injection pumps

Claim 1

In an r.p.m. regulator for a fuel injection pump associated with an internal combustion engine and having a driven reciprocating pump piston, the improvement comprising A. a fuel quantity control means, the position of which determining the moment of fuel cutoff during each delivery stroke of said pump piston, B. an r.p.m.-responsive device having a governor member for exerting an increasing force in a first direction upon an r.p.m. increase, C. a chamber, D. a starting piston slidably held for movement in said first direction and in an opposite, second direction and disposed in part in said chamber, E. a starting spring urging said starting piston in said second direction into an operative or protruding position, F. means for generating in said chamber an r.p.m.-dependent hydraulic pressure exerting a force on said starting piston in said first direction for moving said starting piston into an inoperative or withdrawn position beyond a predetermined r.p.m., G. a lever assembly including 1. stationary pivot means, 2. a first lever swingable about said pivot means and having a detent affixed thereto, said governor member being in contact with said first lever for moving the latter in said first direction towards said starting piston to an r.p.m.-dependent extent, 3. a second lever swingable about said pivot means and formed of a. a first arm engaging said fuel quantity control means, b. a second arm integral with said first arm and disposed in the path of motion of said starting piston, said second arm being moved away from said detent and into contact with said first lever by said starting piston in said operative position for the delivery of excess fuel quantities required for the starting of said engine, 4. a linkage spring disposed between said first lever and said second arm of said second lever for urging said second arm away from said first lever and into abutting contact with said detent and H. a throttled discharge channel communicating with said chamber for slowing down the buildup of said r.p.m.-dependent pressure therein, said discharge channel closed by said starting piston upon travelling a predetermined distance under the effect of said hydraulic pressure in said first direction from said operative position into said inoperative position.