Air-fuel ratio controller of variable-venturi type carburetor

Abstract

An air-fuel ratio controller of a variable-venturi type carburetor having an air inlet port opening at the upstream side of the suction piston, a branching chamber connected to a passage leading from the air inlet port and branching the passage into a bleed-side passage leading to the bleed portion of the carburetor and a by-pass passage leading to the downstream side of the suction piston, and a valve device disposed in the branching chamber. The valve device is adapted to move reciprocatingly to vary the areas of the bleed-side passage and the by-pass passage relatively in such a manner that, when the area of one of the passages is increased, the area of the other passage is decreased. In consequence, the position of the suction piston is never changed by the change in the amount of bleed air, so that the control of the air-fuel ratio of the mixture is very much facilitated.

Dependencies are inferred from the claim text.