| 摘要 |
Disclosed is a carburetor which regulates the supply of fuel and air in response to the vacuum pressure conditions in the mixing chamber between a downstream butterfly throttle valve and an upstream butterfly air valve. Liquid fuel is supplied to the mixing chamber through a nozzle with a number of small orifices and its delivery is controlled by a fuel supply valve operated by the air valve shaft. The air valve and fuel supply valve are operated in unison by a vacuum responsive actuator connected to the mixing chamber and adapted to adjust the air flow through the air valve in response to mixing chamber vacuum pressure. A second vacuum responsive actuator connected to the intake manifold is used to enrichen or lean the fuel mixture ratio in response to engine demand by bleeding air into the fuel supply line between the fuel valve and nozzle. The fuel valve has a vertically reciprocal piston which is operated in a vertical bore in the carburetor housing by an eccentric pin on the air valve shaft, and a cam follower with a self adjusting fulcrum. Choking for cold engine starts is achieved by biasing the air valve butterfly or regulating an outside air bleed line by a temperature responsive valve.
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