| 摘要 |
PROBLEM TO BE SOLVED: To facilitate attaching a boot band to a band groove without degrading a boot band detachment prevention function.SOLUTION: A constant-velocity universal joint boot 40 comprises: a bellows portion 42; a small-diameter attachment portion 44 provided in a small-diameter-side end portion of the bellows portion 42; and a large-diameter attachment portion 46 provided in a large-diameter-side end portion of the bellows portion 42, a band groove 48 being formed on an outer circumference of each of the attachment portions 44 and 46, the constant-velocity universal joint boot 40 being configured so that a protrusion portion 50 rising from an outer end portion of the band groove 48 toward an outside diameter is provided, and an external shape of the protrusion portion 50 is a circular shape about a center decentralized from a center of a cylindrical bottom surface 48a of the band groove 48.SELECTED DRAWING: Figure 1 |
