| 摘要 |
PROBLEM TO BE SOLVED: To provide a boot to cover a constant velocity joint absolutely necessary as a driving shaft joint of a front-wheel drive vehicle, preventing the entry of water or dust into the joint part of the constant velocity joint, and having further improved durability. SOLUTION: A bellows part 3 has a first mountain portion (A), a second mountain portion (B), a third mountain portion (C), a fourth mountain portion (D), and a fifth mountain portion (E) formed in sequence from the side of a large diameter fitting part 1. In the cross section including the center axis, the peak point of each of the second, third and fourth mountain portions (B), (C), (D) is arranged on the outer periphery side of a straight line L<SB>1</SB>connecting the peak point of the first mountain portion (A) to the peak point of the fifth mountain portion (E). The diameter of the fifth mountain portion (E) is smaller than the diameter of the other mountain portion to improve rigidity. The diameter of each of the second-fourth mountain portions (B)-(D) is larger to sufficiently secure a membrane length. These effects improve elasticity and flexibility as well as durability. COPYRIGHT: (C)2008,JPO&INPIT
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