| 摘要 |
<p>A boot (10) has a large diameter tube section (18), a small diameter tube section (20), and a bellows section (22) for connecting the large diameter tube section (18) and the small diameter tube section (20). The bellows section (22) has, in a continuous manner, first to sixth crest sections (24a to 24f) and first to sixth root sections (26a to 26f). The angles (?1 to ?3) of opening of the inner peripheral surfaces of the crests of the first to third crest sections (24a to 24c) are set smaller than the angles (?4 to ?6) of opening of the inner peripheral surfaces of the crests of the fourth to sixth crest sections (24d to 24f). Further, the wall thicknesses (t7 to t12) of tilt sections (28g to 28l) are set smaller than the wall thickness (t1 to t6) of tilt sections (28a to 28f).</p> |
