PURPOSE: To prevent excessive rotation of an internal combustion engine in case of a full-open failure, to hardly leak air in full-close, to shorten length in the axial direction so as to stabilize a property, to carry out starting and warming up operation/traveling of the internal combustion engine even in case of a full-close failure, and to save fuel.
CONSTITUTION: An electric air control valve 101, which is provided with a poppet valve element 129 driven by means of a movable iron core 118, and a rotary type flow rate regulating valve 212, which is provided with a rotary valve element 147 rotationally driven by means of a bimetal 150 responding to cooling water temperature in an internal combustion engine, are arranged in series, while an auxiliary bypass valve 201, which is provided with an auxiliary valve element 211 rotationally driven by means of the bimetal 150 and bypasses the electric type air control valve 101 is arranged, and the maximum flow rate is restricted by means of the rotary type flow rate regulating valve 212.
NAKAO KENJI
MATSUMOTO OSAMU
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