PURPOSE: To enable reliable opening and closing of an opening part without detecting opening and closing of a flap by means of an electric means by a method wherein the opening of a housing mounted between cold air inlet and outlet parts is opened and closed by means of the blades of a rotary rotor, and transmission between a rotor drive output shaft and the rotor is effected by means of a frictional force therebetween.
CONSTITUTION: A drive signal is inputted to a motor 30, and rotation of the motor 30 is transmitted through a reduction gear 32 to a final output shaft 34. In this case, since the rotation is transmitted between a protrusion part 34b made of rubber of the final output shaft 34 and a recessed part 36e of a rotor 36 by means of a frictional force therebetween, the rotor 36 is rotated in a direction in such a way that opening parts 25a and 25b are closed. In this case, when blade parts 36b and 36c of the rotor 36 make contact with the opening parts 25a and 25b, the rotor 36 is not rotated by the motor 30 and the final output shaft 34 are rotated in a slipping state in the recessed part 36e of the rotor 36. An opening part 25 is opened and closed by means of the blade parts of the rotor 36 without using an electric switch and the output time of a drive signal is set to a value slightly longer than a time required for opening and closing of the opening part 25, whereby the rotor 36 is reliably held in an opening and closing positions, and since an output shaft is raced, the motor is prevented from a damage.
TSUJIMOTO AKINORI
OGURA CHIKAHIRO
