GB600552A - Improvements in and relating to fuel-injection carburettors - Google Patents

Abstract

600,552. Spray carburetters. SOC. ANON. SOLEX. April 16, 1941, No. 4979. Convention date, May 24, 1940. [Class 7 (iii)] In a carburetter having the fuel fed under pressure by a pipe 6 and past a valve 9 controlled by a diaphragm 10 acted on by the fuel pressure, and at the opposite side by the suction in the intake 1 transmitted by a connection 18, 19, this suction is also made to act on a second diaphragm 17 which is constructed of greater area than the first diaphragm 10 so as to multiply the effect of the suction in the valve. The fuel chamber 7 at the left of the diaphragm 10 is connected by a passage 12, and also by a nozzle 29, to a further nozzle 14 separated by an air space from the spraying-nozzle 5 of venturi form, the passage 12 being controlled by a slide valve 30 actuated by a lever 32 and a diaphragm 35, subjected at the right-hand side to the suction in the induction pipe through a connection 39 and 40 or 41, the effect being such that the passage 12 is closed at light loads. The contiguous sides of the diaphragms 17 and 35 are in communication by a hole 42 and are connected to the atmosphere at 28. The valve 30, when raised to close the passage 12 for running light, also opens a passage 43 connecting the chamber 16 between the diaphragms 10, 17 to a chamber 44, which is connected to the intake pipe by openings 45, 46, the latter of which is traversed by the edge of the throttle 2 as this is opened, the arrangement being such that, when running light, there is an increased suction action on the diaphragm 17 so as to give a further opening of the valve 9 and consequent increase in the fuel pressure. The diaphragm 35 also serves to produce an increased fuel supply when the throttle is suddenly opened for acclerating. The suction action in the chamber 16 may be further modified by an air-inlet valve 22 on the pipe 19, which is opened, when the throttle is partly closed, by suction action on a diaphragm 24 ; or such a diaphragm may control a needle valve controlling a passage connecting the opposite sides of the diaphragm 17. The fuel supply may be increased at starting by means of a hand lever 60 acting on the diaphragm 17 through a spring 58 ; or the lever 60 may be connected with lost-motion to the throttle control 3. In further modifications, there may be two nozzles 29, one of which is controlled by the valve 30 ; and an altitude control may be provided by a barometric capsule which controls an air-inlet valve on the pipe 19, or limits the downward movement of the valve 30.