Ntn Corporation

Masahide Miyata

Shin Tomogami

Shinichi Takabe

Tatsuhiro Goto

Mika Kohara

Tsuyoshi Ueno

Hiroshi Murakami

Mikio Tomiyama

A constant velocity universal joint includes an outer joint member and a joint internal component received in the outer joint member. A shaft is fitted into an inner joint member. The outer joint member has a cup bottom formed on a side opposite to a shaft-fitting side. The cup bottom is configured to regulate movement of the joint internal component toward the side opposite to the shaft-fitting side in a normal state in which an impact generated in an abnormal state is not applied. The cup bottom has a cut portion which is to be cut by the impact generated in the abnormal state involving movement of the joint internal component toward the side opposite to the shaft-fitting side.

Constant velocity universal joint

There is provided a constant velocity universal joint having excellent durability at high temperature while using a boot made of silicone rubber that does not include cerium oxide or other rare earth element-containing compound. The constant velocity universal joint is provided with an outer joint member (), an inner joint member (), a shaft () coupled to the inner joint member (), and a boot () mounted directly or via another member to the outer joint member () and the shaft (), the boot () being a molded article of a silicone rubber composition including silicone rubber, iron oxide, and titanium oxide and not including a rare earth element-containing compound. The silicone rubber composition furthermore includes barium zirconate as required.

A constant velocity universal joint includes an outer joint member has three track grooves extending axially in an inner circumference portion thereof with a roller guide surface extending axially on each side of the respective track grooves; a tripod member has three trunnions protruding in the radial direction; and a roller mechanism is mounted in each of the trunnions of the tripod member. The roller mechanism is capable of swinging and oscillating freely with respect to the trunnions, and has a roller guided along the roller guide surface in the direction parallel to the axis line of the outer joint member. An outer peripheral surface of the roller, which is made by ground-finishing, is in contact with the roller guide surface, and has a surface roughness of 0.35 Ra or less.

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Shizuoka, Japan

Masahide Miyata