| 摘要 |
PURPOSE:To enable to perform the silent and smooth oscillating motion of vanes by a compact mechanism wherein an actuator utilizing a shape memory alloy means of Cu-Zn-Al base, Ti-Ni base or the like material is employed. CONSTITUTION:The actuator 50 consists of an operating member 60, which slides within a cylindrical outer tube 54 equipped with both bottoms and both the surfaces of which serves as the spring seats of an ordinary coiled spring 56 and a coiled spring 58 made of a shape memory alloy such as Cu-Zn-Al base metal, Ti-Ni base metal or the like, both springs being installed opposing to each other with the operating member 60 therebetween. Both the ends of the coiled spring 58 are connected to a drive control circuit 66 in order to easily control the voltage applied across both the ends of the coiled spring 58. When electric current is supplied to the coiled spring 58, said spring 58 is heated up to a high temperature state, which results to shift the operating member 60 to the right end side of a notch 52 by the shape memory effect and the energizing of the coiled spring 58 is stopped with the shifting movement of the operating member 60 and the temperature of the coiled spring 58 is left to lower so that the operating member 60 is shifted to the left end side of the notch 52 by the action of the coiled spring 56 serving as a bias coil in order to restore the initial state enabling the shape memory alloy to actuate its shape changing action again. Accordingly, neither motor nor air pressure source becomes necessary, resulting in enabling to realize very quiet operation and compact construction. |
