Fuel injection pumps

Claim 1

A FUEL INJECTION PUMP FOR AN INTERNAL COMBUSTION ENGINE COMPRISING A CYLINDER, A PISTON RECIPROCABLE BY SAID ENGINE IN SAID CYLINDER TO PROVIDE A PUMPING ASSEMBLY HAVING A PUMPING STROKE DURING AT LEAST A PART OF WHICH FUEL IS INJECTED INTO AN ENGINE CYLINDER AND A SUCTION STROKE DURING WHICH NO FUEL IS INJECTED INTO SAID ENGINE CYLINDER, A FIRST FUEL INLET OPENING TO SAID CYLINDER AT A LOCATION SUCH AS TO BE BLANKED OFF BY SAID PISTON DURING AT LEAST A PART OF A PUMPING STROKE OF SAID PISTON TO DEFINE THE COMMENCEMENT OF THE EFFECTIVE PERIOD OF INJECTION OF FUEL TO SAID ENGINE CYLINDER BY SAID PISTON, AN AUXILIARY CYLINDER, AN AUXILIARY PISTON RECIPROCABLE BY SAID ENGINE IN SAID AUXILIARY CYLINDER, A SECOND FUEL INLET OPENING TO SAID AUXILIARY CYLINDER AT A LOCATION SUCH AS TO BE BLANKED-OFF BY SAID AUXILIARY PISTON DURING A PUMPING OF SAID PUMPING ASSEMBLY, A SLEEVE, A CYLINDRICAL GOVERNOR BODY SLIDABLE IN SAID SLEEVE FROM AN END POSITION AND DISPOSED WITH THE AXIS THEREOF NORMAL TO THAT OF THE PISTON OF THE PUMPING ASSEMBLY, SPRING MEANS OPPOSING DISPLACEMENT OF SAID GOVERNOR BODY IN SAID SLEEVE FROM SAID END POSITION, A FIRST PASSAGE EXTENDING BETWEEN SAID AUXILIARY CYLINDER AND THE INTERIOR OF SAID SLEEVE TO EXPOSE ONE END OF SAID GOVERNOR BODY TO THE FUEL PRESSURE GENERATED BY SAID AUXILIARY PISTON AS A FUNCTION OF ENGINE SPEED TO TEND TO DISPLACE SAID GOVERNOR BODY FROM SAID END POSITION, NON-RETURN VALVE MEANS DISPOSED IN SAID FIRST PASSAGE TO PREVENT THE ESCAPE OF FUEL FROM THE INTERIOR OF SAID SLEEVE THROUGH SAID FIRST PASSAGE TO SAID AUXILIARY CYLINDER DURING A SUCTION STROKE OF SAID PUMPING ASSEMBLY, A SECOND PASSAGE EXTENDING FROM SAID CYLINDER OF THE PUMPING ASSEMBLY TO OPEN TO THE INTERIOR OF SAID SLEEVE AT A LOCATION WHERE IT IS BLANKED-OFF BY SAID GOVERNOR BODY WHEN IN SAID END POSITION, A THIRD PASSAGE OPENING FROM THE INTERIOR OF SAID SLEEVE AT A LOCATION WHERE IT IS BLANKED-OFF BY SAID GOVERNOR BODY WHEN IN SAID END POSITION, A REDUCED DIAMETER NECK-PORTION ON SAID GOVERNOR BODY INTERMEDIATE THE LENGTH THEREOF ARRANGED TO PLACE SAID THIRD AND SECOND PASSAGES IN COMMUNICATION WITH EACH OTHER UPON SAID GOVERNOR BODY BEING DISPLACED FROM SAID END POSITION BY A PREDETERMINED DISTANCE TO DEFINE THE END OF SAID INJECTION PERIOD, A FOURTH PASSAGE EXTENDING FROM THE INTERIOR OF SAID SLEEVE TO SAID AUXILIARY CYLINDER AND A CUT-AWAY PORTION OF SAID GOVERNOR BODY PROVIDING RESTRICTED COMMUNICATION BETWEEN SAID FOURTH PASSAGE AND SAID ONE END OF SAID GOVERNOR BODY TO PERMIT A RESTRICTED ESCAPE OF SAID GENERATED FUEL PRESSURE DURING THE PERIOD BETWEEN THE END OF AN INJECTION STROKE AND THE COMMENCEMENT OF THE NEXT INJECTION STROKE.