| 摘要 |
PURPOSE:To miniaturize an actuator and simplify the installation of an intake unit by forming said actuator with a shape memory alloy which is combined with a heating element and opening and closing an intake door via a link according to the change in shape of said alloy when it is heated. CONSTITUTION:When a heating element 37 is electrified, an actuator 35 made of a shape memory alloy is contracted causing a second link 28 to rotate in the D direction against a return spring 31 while a first link 25 to rotate in the E direction via a stopping projection 27 and an opening part 26. And, a rod pushes in an intake door 20 to an open air introducing inlet 7 side closing the open air introducing inlet 7 while opening an inside air introducing inlet 6. On the other hand, when the electrification to the heating element 37 is cut off, the actuator 35 is restored to the original extended state restoring the return spring 31, causing the rod to draw back the intake door 20 to the inside air introducing inlet 6 side, thereby, closing the inside air introducing inlet 6 while opening the open air introducing inlet 7. |
