| 摘要 |
PURPOSE: To increase load capacity by forming an angle at which an axial line and an axial track central line are deviated from zero in the projection in the radial direction to the axial line on both sides of each central plane and are reduced toward end parts in the track axial direction when ball tracks in each part on an outer side and an inner side of a joint are coaxial and the central planes agree. CONSTITUTION: A cage 16 guides on a plane bisecting an angle when rotary axial lines A11', A13 in an outer part 11 and an inner part 13 of a joint are bent. When the axial lines A11', A13 in the outer part 11 and the inner part 13 of the joint are coaxial and central planes E11', E13 agree, ball tracks 12, 14 form an angle at which central lines M12, M14 of the axial line and track are mutually deviated from zero in the projection in the radial direction to the axial lines A11', A13 and are reduced toward end parts in the axial direction of the tracks on both sides of central planes E11', E13. Consequently, when a joint is bent and the ball reaches an end division, the tracks do not apply control force to the ball within a bending plane in a scope of angle, and reduced force is applied to the cage.
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