GB970554A - Carburetor - Google Patents

Abstract

970,554. Spray carburetters. ACF INDUSTRIES Inc. March 5, 1962, No. 8349/62. Heading FIB. To reduce vaporizing of the fuel, a carburetter comprises a first body portion Sl comprising the fuel bowl 1 and a portion 9 of the Venturi throat and a second body portion S2 comprising the convergent portion 19 of the Venturi and a downwardly projecting block 23 in which is formed the fuel feed passages. The carburetter is completed by a cover and air entry section S3 and a throttle section S4, heat insulating gaskets 50, 57, 65 being provided between the body sections. The block 23, which projects into the feed bowl without contacting the wall thereof to reduce heat transmission to the fuel feed passages, includes a feed jet 131, Fig. 7, controlled by a needle 129 actuated by a suction actuated piston 139, through which jet the fuel flows to a well 115 feeding the main fuel nozzle 111, and also an accelerating pump cylinder 199, Fig. 11, feeding the accelerating nozzle 217. An idling jet 161, Fig. 10, also carried by the block 23, feeds through passages 93, 179 to idling orifice 193. The accelerating pump 197 is moved downwards on its suction stroke by linkage 221, 225, connected to the throttle valve spindle and is forced upwards on its delivery stroke by a spring 203. When the throttle valve is opened wide a projection 317 on the rod 221 lifts the fuel metering rod to its maximum fuel position regardless of the action of the suction piston 139. The float valve 75 is controlled by a pair of floats 85. The eccentrically pivoted choke valve 235 is controlled by a bimetallic coil 243 and a suction actuated piston and the choke valve is pulled open for deflooding, when the throttle valve is opened wide, by a linkage 303, 309 connected to the throttle spindle 67. An air filter is held on the air intake S3 by a bolt 54 screwing into radial struts 53. The body section S2 may be of aluminium.