Patent ID: 6702262
Filing Date: 2004-03-09
Classification: F02M,Y10S

Abstract:
A fuel system of a carburetor, comprisinga single fuel passage leading from a constant-fuel chamber to a nozzle orifice opened into an intake channel, wherein a fuel adjusting part and a mixing chamber are provided in said fuel passage, said fuel adjusting part adjusts the effective surface area for passing the fuel with a metering needle executing linear reciprocal movement in response to the open-close operation of a throttle valve, any bleed air and fuel passing through said fuel adjusting part are introduced into said mixing chamber which has a volume sufficient to absorb and cause the relaxation of changes of the negative pressure acting on said nozzle orifice, a mixture of fuel and bleed air produced in said mixing chamber is discharged from said nozzle orifice into said intake channel, wherein a fuel nozzle provided with a metering hole in a wall of a tube having a through hole linked to said constant-fuel chamber and a discharge flange is fitted and disposed in a retaining hole by positioning said discharge flange in almost the same plane with the surface of said intake channel, said metering needle extends in the direction crossing said intake channel inside therein, penetrates into said through hole and forms said fuel adjusting part together with said metering hole, said mixing chamber is provided around said tube, and said nozzle orifice is formed by a small hole provided in said discharge flange.