| 摘要 |
PURPOSE:To improve the response of the air-fuel ratio control by forming a slow fuel passage with a slow port, a float chamber, and three portions opened to the atmosphere and by opening or closing the portions opened to the atmosphere in synchronism with an enrich valve and in accordance with operating conditions. CONSTITUTION:A large and small venturis 12, 14 are provided in the main body 10 of a carburetor, and a main nozzle 18 connected to a float chamber 24 through a main fuel passage 20 is provided on the small venturi 14. A slow port 34 is provided near a throttle valve 16 and fuel is fed through a slow fuel passage, which is formed with the first portion 38 connected to a slow port 34, the second portion 39 connected to the float chamber 24, and the thrid portion 40 extending from the joint of both portions 38, 39. Jets 42, 44, 46 as an air bleed means are provided on the third portion 40 so that the jet 46 can be connected to a negative pressure passage 59 leading to an atmospheric passage 58 or enrich valve 26 through a closing valve 56. |
