SILICONE BOOT FOR CONSTANT VELOCITY UNIVERSAL JOINT AND CONSTANT VELOCITY UNIVERSAL JOINT

摘要

Provided are a silicone boot for a constant velocity universal joint, in which occurrence of cracks in a boot's small-diameter section is suppressed to enhance the durability of the boot, and the constant velocity universal joint. The silicone boot for a constant velocity universal joint has a large-diameter section (13) installed on an outer joint member (2) of the joint, the small-diameter section (14) installed on a shaft (9) connected to an inner joint member (4) of the joint, and a bellows section (15) placed between the large- and small-diameter sections (13, 14) and having crests (7) and roots (6) alternately formed on the bellows section. The small-diameter section (14) has a shaft installation section (37) having, formed on its outer diameter surface, a fitting groove (19) in which a boot band is fitted, and also has a thin wall section (38) continuing from the shaft installation section (37) to the bellows section (15) via a thick wall section (25) and allowing buckling-like displacement of the small-diameter section (14) relative to the shaft installation section (37) and the bellows section (15).