| 摘要 |
PROBLEM TO BE SOLVED: To obtain a resin boot as a boot for a triport type joint which achieves cost reduction by integral molding using resin material, and yet can be uniformly fastened fixedly throughout the entire outer periphery of an irregular shaped outer case maintaining good mounting and sealing performance. SOLUTION: Sections, comprising a larger diameter side mounting section 2 mounted on the outer periphery of the outer case 21, a smaller diameter side mounting section 3 fitted on a shaft 10 of the triport 13 side, and a bellows section 4 between both of the mounting sections, are molded integrally using the resin material, wherein the inner periphery of the larger diameter mounting section 2 is configured to be a non-circular geometry corresponding to a convexo-concave contour of the outer periphery of the outer case 21, a thick section 2a is formed to have a concave portion toward inside, and volume relief means 7 are provided on the thick section 2a, thereby generally uniform fastening can be made available throughout the entire outer periphery of the outer case.
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