GB721627A - Improvements in or relating to carburetters for internal combustion engines - Google Patents

Abstract

721.627. Spray carburetters. CHARLES. H. N., and MANLEY. G. E. Oct. 14. 1953 [Aug. 6, 1952], No. 19760/52. Class 7 (3). A suction operated cylindrical throttle valve g, Fig. 1, actuated by a piston f has combined therewith a manually operable valve k controlling the communication between the intake pipe and the cylinder e containing the piston f. The valve g is spring-loaded and actuated by intake pipe suction transmitted through an opening j controlled by the spring- loaded valve k which is actuated by a cable p and has a stem m sliding in a guide n. Lifting of the valve k permits the suction to act on the piston f whereby the throttle valve g is raised until the opening j is throttled sufficiently to reduce the suction acting on the piston f to the equilibrium value which balances the force of the spring q. To close the throttle valve ,the valve k is released, whereby the opening j is closed to cut off the suction and the valve g is moved downwards by the combined forces of the loading springs q and r of the piston f and valve k, the lowest position of the valve g being determined by a spring-loaded adjustable stop i. The fuel is supplied by a main nozzle 11 consisting of a ring member 12 with several spray orifices 13, and a pilot nozzle 17 fed through a passage 19 from an aerating chamber 15 for the nozzle 11, additiona aerating air being supplied to the nozzle 17 through an adjustable orifice. The supply pipe 6, Fig. 5, from the float chamber 5 to the fuel nozzles contains an adjustable needle valve 9. In a modification, Fig. 2, the valve member k actuates a second valve t which controls vents v connecting the suction space of the piston f to atmosphere. When the valve k is lifted, the valve t is raised to close the vents v and permit the intake pipe suction to lift the valve g, equilibrium being re-established when the vents v are partially reopened. An adjustable stop h limits the lowest position of the valve k, and the valve g moves to its fully closed position when the engine stops, a groove x enabling the suction to .move the valve from this position when the engine is started. The Provisional Specification states that the fuel metering needle 9, Fig. 5, is adjusted by a knurled knob co-operating with a spring-loaded detent device serving as a locking device and as a device indicating the amount of rotation of the knob.