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FLOW RATE CONTROL VALVE, FLOW RATE CONTROL VALVE FOR IDLE CONTROL OF INTERNAL COMBUSTION ENGINE UTILIZING THE SAME VALVE, AND TEMPERATURE-SENSITIVE MEMBER USED FOR IDLE CONTROL DEVICE AND FLOW RATE CONTROL VALVE
FLOW RATE CONTROL VALVE, FLOW RATE CONTROL VALVE FOR IDLE CONTROL OF INTERNAL COMBUSTION ENGINE UTILIZING THE SAME VALVE, AND TEMPERATURE-SENSITIVE MEMBER USED FOR IDLE CONTROL DEVICE AND FLOW RATE CONTROL VALVE
PURPOSE:To prevent defective operation of a valve body by a method wherein a mechanism to change a clearance between a rotary valve body and a valve seat through relative movement of the two members is provided, and the clearance is set to a high value in a place in the vicinity of a position where the rotary valve body is fully opened and a low value in a place in the vicinity of a position where it is fully closed. CONSTITUTION:A flow rate control valve is located in the middle of a bypass intake air passage 8 connected to an intake air passage in a manner to bypass the throttle valve of an internal combustion engine. The flow rate control valve causes a permanent magnet 3 to generate a rotation force through energization to a solenoid 1, and rotates a rotary valve 5 through a shaft 4 to a position where it is balanced with a rotation force in a reverse direction generated through the force of a return spring 13. In this case, a valve seat 9 positioned facing the rotary valve 5 is moved forward and backward by means of a temperature-sensitive member 11 with which a variable clearance mechanism is formed. The temperature-sensitive member 11 is formed to an annular base sheet 11a, formed in a manner to surround the outer periphery of a passage element 8b, such that a plurality of bimetal pieces 11b are cut and risen axially of the base sheet 11a, and is changed in a state to be expanded and contracted according to the temperature of cooling water in a cooling water passage 12.
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