Fuel injection pumps

Claim 1

A FUEL INJECTION PUMP FOR AN INTERNAL COMBUSTION ENGINE COMPRISING A HOUSING, A CYLINDER WITHIN SAID HOUSING, A PISTON RECIPROCABLE WITHIN SAID CYLINDER BY SAID ENGINE TO FORM A PUMPING ASSEMBLY HAVING A PUMPING STROKE OF THE PISTON DURING AT LEAST A PART OF WHICH FUEL IS INJECTED INTO AN ENGINE CYLINDER AND A SUCTION STROKE DURING WHICH NO FUEL IS INJECTED TO SAID ENGINE CYLINDER, AN ENLARGEMENT OF SAID PUMPING CYLINDER PROVIDING AN AUXILIARY CYLINDER, AN ENLARGEMENT OF SAID PISTON RECIPROCABLE IN SAID AUXILIARY CYLINDER BY SAID ENGINE, A FIRST FUEL INLET PASSAGE OPENING INTO SAID PUMPING CYLINDER AT A LOCATION BLANKED-OFF BY SAID PUMPING PISTON DURING A PUMPING STROKE TO DEFINE THE COMMENCEMENT OF THE PERIOD OF INJECTION OF FUEL TO SAID ENGINE CYLINDER AND OPENING TO THE EXTERIOR OF SAID HOUSING FOR CONNECTION TO A LOW PRESSURE FUEL SUPPLY, A SECOND FUEL INLET PASSAGE OPENING INTO SAID AUXILIARY CYLINDER AT A LOCATION BLANKED-OFF BY SAID AUXILAIRY PISTON DURING A PUMPING STROKE TO GENERATE A FUEL PRESSURE IN SAID AUXILIARY CYLINDER AS A FUNCTION OF ENGINE SPEED AND OPENING TO THE EXTERIOR OF SAID HOUSING FOR CONNECTION TO SAID LOW PRESSURE FUEL SUPPLY, A GOVERNOR SLEEVE IN SAID HOUSING, A FIRST PRESSURE TRANSMITTING PASSAGE EXTENDING BETWEEN SAID AUXILIARY CYLINDER AND SAID SLEEVE TO TRANSMIT SAID GENERATED FUEL PRESSURE TO SAID SLEEVE, A NON-RETURN VALVE IN SAID FIRST PRESSURE TRANSMITTING PASSAGE TO PREVENT ESCAPE OF SAID GENERATED FUEL PRESSURE FROM SAID SLEEVE THROUGH SAID FIRST PRESSURE TRANSMITTING PASSAGE TO SAID AUXILIARY CYLINDER DURING A SUCTION STROKE OF SAID PUMPING PISTON, A SECOND PRESSURE TRANSMITTING PASSAGE EXTENDING FROM SAID SLEEVE TO SAID AUXILIARY CYLINDER TO PERMIT THE ESCAPE OF SAID GENERATED FUEL PRESSURE FROM SAID SLEEVE DURING THE PERIOD OF TIME BETWEEN THE END OF A PUMPING STROKE OF SAID PUMPING PISTON AND THE COMMENCEMENT OF THE NEXT SUCCEEDING PUMPING STROKE OF SAID PUMPING PISTON, A FIRST RESTRICTION ASSOCIATED WITH SAID SECOND PRESSURE TRANSMITTING PASSAGE TO CONTROL THE ESCAPE OF SAID GENERATED FUEL PRESSURE FROM SAID SLEEVE