INTAKE APPARATUS OF ENGINE

摘要

PURPOSE:To prevent fluctuation of the air-fuel ratio by connecting a return pipe to the bottom of an air chamber in the intake passage independent of a branching pipe thereby returning the fuel constituents of the air-fuel mixture flowed into an empty chamber on each stroke without remaining in the said chamber. CONSTITUTION:A return port 22 is provided at the bottom of an empty chamber 18 connected via a branching pipe 19 to an intake passage 13' at the down stream side of a throttle valve 17 of a carburetor 1 and connecting a return pipe 23 having small diameter than the branching pipe 19 to the said return port 22 to return the fuel constituents of the air-fuel mixture flowed into the empty chamber 18. After completion of the intake stroke of the engine B, the air-fuel mixture formed by a carburetor 1 flow to the intake passage 13' and into the empty chamber 18 via the branching pipe 19 on its way and returns to the intake passage 13' via the branching pipe 19, but its fuel constituent adhered to the wall of the empty chamber 18 returns to the intake passage 13' via the return port 22 and return pipe 23 without remaining in the chamber 18 thereby eliminating fluctuation of the air-fuel ratio.