GB316263A - Carburettors for internal combustion engines - Google Patents

Abstract

316,263. Holley, G. M., (Assignee of Shepard, E. H.). July 26, 1928, [Convention date]. Spray carburettors.-A fuel nozzle fed under a constant head discharges downwardly by gravity into a downwardly-flowing air current, the outlet of the nozzle being at all times open, and the flow through the nozzle is controlled by means interconnected with the throttle valve. A single and a twin carburettor are described, the latter comprising an air inlet 2 controlled by a valve 19, and mixture outlets 29, 30 controlled by throttle valves 31, 32. The main nozzles 34, 35 discharge into primary mixing chambers 25, 26 which, in turn, discharge into secondary mixing chambers 27, 28. The nozzle outlets are controlled by needle valves 36, 37 screwed into a yoke 38 connected through links 39, 40 with the throttle spindle 33. The yoke is thus lifted and the fuel outlets enlarged when the throttles are opened, the yoke being guided by rods 44. A cylinder 13 is also raised at the same time and lifts by suction a spring-loaded piston carrying a needle valve 12 which permits a temporary increased supply of fuel to flow through additional nozzles 42, 43. The flow of fuel from the float chamber 10 to the nozzles is controlled by a valve 15 acted upon by a diaphragm 16 subjected to the pressure of lubricating oil through a pipe 18. With this arrangement the fuel flow ceases when the engine stops or when the oil pressure is too low. A priming valve 23, Fig. 4, fed through a duct 46, is adapted' to be opened, through linkage 21, 22, by the air throttle 19. A hole 47 in the throttle spindle provides a duct for slow-running.