| 摘要 |
PURPOSE:To attain a proper air fuel ratio over the whole range by providing an actuator which varies the quantity of air bleed by means of the difference in supercharging pressures between the upper and lower courses of a carburetor, in a pressurized carburetor. CONSTITUTION:In a carburetor 3, a float chamber 6 which is led to a fuel tank is provided, and a main nozzle 9 is connected to a venturi part 8 in the upper course of a throttle valve 7. On the top of the air passage of an air bleed 10 connected to the main nozzle 9 is provided a needle valve 11, which is actuated by means of an actuator 12. A suprcharging chamber 12b has an opening in the upper course of the carburetor 3 and a pressure chamber 12c is connected to the lower course of the throttle valve 7. The actuator 12 is fluctuated by means of difference in pressures applied to the top and bottom faces of a diaphragm 12a. Thereby, a proper air fuel ratio can be obtained over the whole range.
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