Ntn Corporation

Keisuke Nishio

Yukihiro Watanabe

Mikio Tomiyama

Atsuto Takemura

Shintaro Harada

A silicone boot for a constant velocity universal joint includes a larger diameter portion attached to an outer joint member of a constant velocity universal joint, a smaller diameter portion attached to a shaft coupled with an inner joint member of the constant velocity universal joint, and a bellows portion, which is arranged between the larger diameter portion and the smaller diameter portion, and has peak portions and valley portions formed alternately with each other. The smaller diameter portion includes a shaft attachment portion having a radially outer surface in which a fitting groove for attachment of a boot band is formed, and a thin portion extending from the shaft attachment portion so as to be coupled with the bellows portion through intermediation of a thick portion and allowing buckling deformation with respect to the shaft attachment portion and the bellows portion.

Silicone boot for constant velocity universal joint and constant velocity universal joint

A boot-mounting structure for a constant velocity universal joint has a configuration which can prevent a crack caused by interference with a boot band while maintaining a stable sealing property. The boot band () is fitted into a fitting groove of a silicone boot (), and is decreased in diameter while being attached into the fitting groove, to thereby fix the silicone boot (). The boot band () is formed into an annular body not provided with a folded-back portion. There is provided a no-interference structure means (S) for preventing interference caused, when the boot band is decreased in diameter, between an axial outer-peripheral-edge portion (or) of the band () and a bottom end portion (or) of the fitting groove () corresponding thereto.

Boot mounting structure for constant-speed universal joint, and silicone boot for the constant-speed universal joint

A shaft mounting structure of a constant velocity joint is capable of ensuring sufficient strength of a fitting portion between an inner ring and a shaft. In the shaft mounting structure, a groove is formed on the shaft middle side compared to the position of a male spline of a shaft and the outside diameter of a bottom portion of the groove is set at a value larger than the root diameter of the male spline.

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Iwata, Japan

Keisuke Nishio