| 摘要 |
A bellows region 3 has six protrusions 3a (3a1, 3a2, ...3a6, starting from the region of smaller diameter 2), five depressions 3b (3b1, 3b2, ...3b5, starting from the region of smaller diameter 2), and slopes 3c which connect the protrusions 3a and the depressions 3b. The thickness of each protrusion 3a and each depression 3b is 0.5 to 1.45 mm, and the ratio of the thickness between adjacent protrusions 3a and depressions 3b (depression/protrusion) is 1.0-1.5. The protrusions 3a and depressions 3b have the same thickness in the axial direction. <IMAGE>
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