GB1466996A - Charge forming apparatus - Google Patents

Abstract

1466996 Spray carburetters BORG-WARNER CORP 8 April 1974 [1 June 1973] 15493/74 Heading F1H At least one plate 14 or 408, 409, 410, 411, 412, Fig. 39, provides fluid-flow passages between passages of adjacent carburetter body members 11, 12 or 398, 346. The plates may be formed of gasket material, synthetic rubber, resinous plastics, copper, brass, aluminium or stainless steel and thin gaskets (15 and 172), Fig. 9 (not shown) may be provided between a plate (14') and the body members 11, 12. In the embodiment shown in Figs. 7, 8 and 16 having a diaphragm-operated fuel inlet valve 104 and a pumping diaphragm operated by engine crank-case pressure pulses in a chamber 182 the plate 14 provides fuel, air and mixture flow passages. The Specification discloses many different arrangements of plate passages to provide various operating characteristics. The body member 12 includes adjustable main and idling fuel metering valves (140, 157), Figs. 13 and 14 (not shown), which may be connected in series or parallel to the fuel chamber 82. The venturi defining member 24 is mounted in the induction passage 17 for replacement by a different member and a ball-valve (226), Fig. 17 (not shown), may be opened at a predetermined engine speed, as detected by vibration, to supply additional fuel to the induction passage and provide an overrich mixture causing the engine to slow down. In the embodiment shown in Fig. 39 fuel from a float chamber 344 is supplied to main and idling orifices 396 and 406 in the induction passage 300 through passages in the plates 408 to 412. The plates also provide air-flow passages from inlets 390 and 400 in the passage 300. Adjustable main and idling metering valves 435 and 450, fixed metering inserts (477, 482), Fig. 41 (not shown), or metering openings (504, 505, 506), Fig. 42 (not shown), may be provided in at least one of the plates. The Specification discloses many different arrangements of the passages in the plates to provide suitable fuel-air ratios of the mixture produced by the carburettor under different operating conditions.