Boot for constant velocity universal joint, and constant velocity universal joint

Abstract

Provided is a boot, which is excellent in durability, for a constant velocity universal joint and provided is a constant velocity universal joint capable of using such a boot, the boot being capable of conforming even to operation at high angles while being flexibly deformed and capable of effectively distributing and equalizing an interference pressure between peak portions, an interference pressure between valley portions and a shaft, and stress concentration onto the valley portions, and contributing to enhancement of abrasion resistance and fatigue resistance. A bellows section (15) of the boot includes three or more peak portions (7) and three or more valley portions (6) arranged alternately with the peak portions (7) along an axial direction. A radially outer portion of each of the peak portions (7) in vertical cross-section of the boot is formed into a round shape. A curvature radius of the radially outer portion of one or two of the peak portions (7) is set to be larger than curvature radii of the radially outer portions of others of the peak portions (7), the one or two of the peak portions (7) being positioned at a central portion between a large diameter section (13) and a small diameter section (14).

Dependencies are inferred from the claim text.