| 摘要 |
PURPOSE:To enable a stable low-speed fuel to be supplied by providing a fixed venturi intake passage in parallel to a variable venturi intake passage, and providing a fuel pipe for the variable venturi so as to pierce through the fixed venturi intake passage, and interlocking the throttle valves in both intake passages. CONSTITUTION:On the upstream side of a main throttle valve 10, a piston 4 for a variable venturi is arranged, and in parallel to the main intake passage 2 a subintake passage 15 is provided. In the subintake passage 15 a fuel passage 11 for the main intake passage 2 pierces through, naturally performing such a function as to narrow the passage area of the subintake passage. In the subintake passage 15 a subthrottle valve 17 is provided, and in the valve closing position an idle port 19 and a low-speed port 18 are provided. The main throttle valve 10 and the subthrottle valve 17 are interlocked by means of a link.
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