Low-pressure fuel injection metering devices for internal combustion engines

Claim 1

IN A LOW-PRESSURE FUEL INJECTION METERING DEVICE FOR INTERNAL COMBUSTION ENGINES HAVING A FEED PUMP SUPPLYING A CENTRIFUGAL PUMP WHICH DELIVERS THE FUEL CONTINUOUSLY THROUGH AN INJECTION SYSTEM OF ADJUSTABLE PASSAGEWAY SECTION WHICH INJECTS THE FUEL INTO THE ENGINE INLET TRACT AT A POINT LOCATED DOWNSTREAM OF AN AIR REGULATING BUTTERFLY-VALVE AND UPSTREAM OF THE CYLINDER VALVES, THE IMPROVEMENT COMPRISING CONTROL MEANS FOR ADJUSTING SAID PASSAGEWAY SECTION, A THREE-DIMENSIONAL CAM COOPERATING WITH SAID CONTROL MEANS FOR REGULATING SAME, THE CONTROL FOR SAID BUTTERFLY-VALVE BEING OPERATIVELY CONNECTED TO SAID CAM TO CONTROL THE ROTATION THEREOF, FIRST RESPONSIVE MEANS RESPONSIVE TO FUEL PRESSURE APPLIED TO SAID INJECTION SYSTEMS, SECOND RESPONSIVE MEANS RESPONSIVE TO THE NEGATIVE AIR PRESSURE PREVAILING IN THE INLET TRACT DOWNSTREAM OF SAID BUTTERFLY-VALVE, SAID FIRST RESPONSIVE MEANS AND SAID SECOND RESPONSIVE MEANS ADAPTED TO CONTROL A RELATIVE TRANSLATIONAL MOTION BETWEEN SAID CAM AND SAID FIRST CONTROL MEANS IN RESPONSE TO CHANGES IN SAID FUEL PRESSURE AND SAID NEGATIVE AIR PRESSURE.