Fuel system of carburetor

Details Fuel system of carburetor Fuel system of carburetor

2005-01-25

2005-01-25

Chiesa, Richard L. (Department: 1724)

Gas and liquid contact apparatus

Fluid distribution

Valved

C261S051000, C261S063000, C261S121300, C261S121400, C261SDIG001, C261SDIG003

Reexamination Certificate

active

06845972

ABSTRACT:
The present invention facilitates the stabilization of the fuel flow rate in a single fuel system carburetor in which bleed air, mixed with fuel, is controlled by a metering needle moving in response to the movement of a throttle valve and the mixture is discharged into an intake channel. The present invention is directed to a carburetor in which an effective surface area of a metering hole is adjusted by a metering needle moving in response to the movement of a throttle valve, and the fuel introduced into a mixing chamber from a constant-fuel chamber under flow rate control with a metering hole is mixed with bleed air and discharged into an intake channel from a nozzle orifice. The mixing chamber has a volume providing for absorption and relaxation of changes in the negative pressure acting upon the nozzle orifice, the fuel is sucked in under stabilized negative pressure, and the air-fuel mixture with a preset air/fuel ratio is supplied over the entire operation range of the engine.

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