| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an air passage opening/closing device allowing improvement of sealing property by wind pressure. Ž<P>SOLUTION: A hollow thickness relief space 32a opened in a width direction W of a door body part 30 is formed in a driven side gear 32. The thickness relief space 32a is formed to connect between teeth with each other of the driven side gear 32. As a result, a rigidity lowering structure for lowering rigidity of the driven side gear 32 so that the door body part 30 may be bent and deformed by wind pressure is constituted. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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