GB786413A - Carburettor for internal combustion engines - Google Patents

Abstract

786,413. Carburetters. AUGUST, P. July 17, 1956, No. 22054/56. Class 7(3) In the no load position of the throttle valve the fuel supply through the main nozzle system is mechanically interrupted and in the same position of the throttle valve the fuel supply through the no load system is interrupted by vacuum when and as long as the engine continues running with a speed of revolution higher than that of its no load condition. In Fig. 1 the member 8 is displaced axially on closing the throttle valve to close the fuel nozzle outlet ports 6 the lever 11 being operatively associated with the throttle valve. Also if the throttle valve is suddenly closed and the engine continues to run at a relatively high speed the vacuum acts in a space 30 and operates a valve 28 which stops the flow of fuel through the idling system until the speed drops to about that for idling. It is stated that instead of embodying an orifice 9 the upper end of the tube 8 may be screwthreaded and an air control nozzle may be screwed into it. Fig. 3 shows a modified means for shutting off the main fuel nozzle comprising an axially displaceable sleeve 15 operatively associated with the throttle valve. In another modification the main nozzle is shut off by a needle valve. Fig. 5 shows a modified arrangement for shutting off the idling fuel supply. A suction operated piston 32 closes the idling fuel supply passage 35 and connects an air supply passage 38 to the engine. Fig. 6 shows another modified arrangement for cutting off the idling fuel suply. A piston 48 is drawn down by the suction acting through a passage 55 which is connected with the mixing chamber behind the throttle valve. The passage 55 is the outlet for the fuel air mixture supplied by the idling system. In Figs. 1 and 5 the suction conduit may be constituted by the conduit supplying the fuel air mixture of the idling system.