Devices for varying the beginning of delivery in fuel injection pumps

Claim 1

A FUEL INJECTION PUMP SYSTEM FOR FEEDING FUEL TO AN INTERNAL COMBUSTION ENGINE, WHICH COMPRISES, IN COMBINATION, A MAIN CYLINDER HAVING AN AXIS OF SYMMETRY, A MAIN PISTON SLIDABLE IN SAID CYLINDER IN THE DIRECTION OF SAID AXIS, A MAIN FUEL FEED CONDUIT OPENING INTO SAID CYLINDER, AT LEAST ONE DELIVERY CONDUIT LEADING OUT FROM SAID CYLINDER, TWO ELEMENTS OPERATIVELY CONNECTED WITH SAID PISTON AND SAID CYLINDER, RESPECTIVELY, ADAPTED TO COOPERATE TOGETHER FOR PRODUCING RECIPROCATING AXIAL DISPLACEMENTS OF SAID PISTON IN SAID CYLINDER, SAID ELEMENTS BEING ANGULARLY MOVABLE WITH RESPECT TO EACH OTHER ABOUT SAID AXIS TO ADJUST THE BEGINNING OF FUEL INJECTION ON EVERY PISTON STROKE, A HYDRAULIC JACK, INCLUDING A JACK CYLINDER AND A JACK PISTON MOVABLE IN SAID JACK CYLINDER TO FORM THEREWITH A VARIABLE VOLUME CHAMBER, FOR CONTROLLING THE ANGULAR POSITION OF SAID TWO ELEMENTS WITH RESPECT TO EACH OTHER, MEANS, RESPONSIVE TO A PRESSURE VARIABLE IN RESPONSE TO VARIATIONS OF THE SPEED OF SAID INTERNAL COMBUSTION ENGINE, FOR FEEDING LIQUID TO SAID JACK CYLINDER, SAID LIQUID FEEDING MEANS INCLUDING A PIPE OPENING INTO SAID JACK CYLINDER AND FORMING THE ONLY COMMUNICATION BETWEEN SAID VARIABLE VOLUME CHAMBER AND THE OUTSIDE, AN AUXILIARY PUMP OPERATIVELY CONNECTED WITH SAID MAIN PISTON AND SAID MAIN CYLINDER FOR WORKING IN SYNCHRONISM WITH THE RELATIVE AXIAL DISPLACEMENTS OF SAID MAIN PISTON AND SAID MAIN CYLINDER, MEANS OPERATIVE BY SAID AUXILIARY PUMP FOR CLOSING SAID PIPE DURING THE DELIVERY STROKES OF SAID PISTON, A DISCHARGE CONDUIT, AND MEANS OPERATIVE BY SAID AUXILIARY PUMP FOR OPENING SAID DISCHARGE CONDUIT AT THE END OF EVERY DELIVERY STROKE OF SAID AUXILIARY PUMP.