| 摘要 |
PURPOSE:To prevent a change of air-fuel ratio, by providing a valve, which is closed when a low negative pressure is generated in an intake pipe, in an air passage of a carburetor, in case of the feedback type carburetor equipped with a duty solenoid provided in the air passage for correcting a slow system mixture. CONSTITUTION:Fuel from a main jet 3 and a jet 8, opened and closed by a valve of a feedback controlled solenoid 5, passes from a passage 4 through a well 2 and a main nozzle 11 being supplied to a Venturi 12 while branches from the passage 4 through a passage 14 and a slow jet 15 being supplied also from ports 20, 21. A slow system is equipped with an air bleed 16 of small contour and an air orifice 18 of large contour, which is feedback controlled, and air from the air orifice 18 passes through a passage 19. The passage 19, in which an intake pipe negative pressure is introduced by a pipe 24, is equipped with a valve 28 closed by a spring 26 when the small negative pressure is generated. When the small negative pressure is generated in an intake pipe, a reverse flow of air from the slow system to a main system is prevented.
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