| 摘要 |
PURPOSE:To supply the mixed gas having the optimum air fuel ratio by forming a plurality of throttles in parallel into an air bleed passage for controlling the flow rate according to the temperature of a variable venturi carburetor and selecting the throttle according to the engine operation state. CONSTITUTION:A needle valve 4 is fixed at the edge surface of a slidable piston 3 installed onto the upstream side of a throttle valve 6. The amount of fuel supply is controlled by controlling the opening area of a jet 21. The bleed air is supplied into the jet part 21 from a hole 24. Said bleed air is supplied from a passage 32 having a throttle 42 installed in parallel to a passage 31 having a throttle 44, through a valve 30 whose opening area is varied by a wax 33 which expands and contracts according to the cooling-water temperature. A negative- pressure reacting valve 41 is installed into the passage 32, and since the intake negative-pressure reduces during acceleration, the valve 41 is closed to reduce the amount of bleed air, and dense mixed gas is supplied, while during deceleration, the valve 41 is opened by a high negative pressure, and the mixed gas is made thin. |
