| 摘要 |
A carburetor for internal combustion engines. Precise regulation of combustion fuel is achieved by means of a high precision metering valve coupled to and operable with the conventional butterfly valve in a manner such that the amount of raw fuel is accurately regulated in accordance with the demand. The metering valve further incorporates a cold start enrichment mechanism and a second metering valve is provided to compensate for abnormal load demands and to prevent overcharging of the engine. The carburetor includes a housing having a throat and a throttle controlled butterfly valve in the throat at the outlet thereof. A fuel nozzle introduces fuel into the throat. An inlet on the housing for receiving fuel from a fuel supply and a first metering valve in the housing for controlling the flow of fuel from the fuel inlet to the nozzle. The first valve comprising a valve seat member having a bore therethrough defining a fuel passage. A valve member mounted for axial reciprocation within the passage. The valve member has a shoulder thereon engageable with the seat at the inlet end of the fuel passage to block the fuel passage. An elongate tapered pin projects axially from the shoulder through the passage. The area of the fuel passage available to the flow of fuel when the shoulder is disengaged from the seat is variable in accordance with the axial position of the pin relative to the fuel passage. The valve member is coupled to the butterfly valve for positioning the pin axially within the fuel passage in accordance with the position with the butterfly valve. A linkage independent of the butterfly valve establishes the axial position of the pin relative to the fuel passage. A vertically elongate inlet chamber formed in the housing. First outlet passage in the housing for conducting fuel from the lower portion of the inlet chamber to the first metering valve. A float chamber defined in the housing. Second outlet passage in the housing for conducting fuel from the upper portion of the inlet chamber to the float chamber. A third passage in the housing for conducting fuel from the lower portion of the float chamber to the throat at a location at the outlet side of the butterfly valve.
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