| 摘要 |
PURPOSE:To vary utilization of a chamber, provided in the suction device of an internal combustion engine in accordance with the operating condition by installing a control valve having a variable opening area at a communication line from the suction path to the chamber. CONSTITUTION:When the vehicle operates under a medium load, a restricting lever 14 turns against the force of a spring 15 and a negative pressure is generated in the suction pipe 1 in accordance with the opening of the throttle valve 12a, and a diaphragm 20a allows, with the aid of an operating member 18, the operating lever 13 to follow said restricting lever 14 and also opens a leaf- shaped valve 8b of a valve construction 8 to put the chamber 10 in communication with the port 4 through a communication pipe 9 and a breathing path 7. If in this condition the valve 12a is slowly opened to shift to the high-speed position the valve 8b will open to an opening corresponding to the negative pressure to put the communication line of the chamber 10 into a little throttled state. Thus the state of chamber utilization can be changed in accordance to the operating condition of the engine.
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