| 摘要 |
A universal joint ( 4; 6 ) comprises an outer ring ( 28 ) held in a fitting hole ( 25 ) of a yoke ( 20; 21 ) and supporting a trunnion ( 24 ) so as to be rotatable with a needle roller ( 27 ) sandwiched therebetween. The outer ring ( 28 ) comprises a main body ( 281 ) fitted in the fitting hole ( 25 ) and a closed end ( 282 ) provided at one end in the main body ( 281 ). The trunnion ( 24 ) comprises an end surface ( 24 a) having a ball holding hole ( 29; 29 A) formed thereon. A ball receiving section ( 31; 31 A) for elastically receiving a ball ( 30 ) held in the ball holding hole ( 29; 29 A) is provided at the closed end ( 282 ) of the outer ring ( 28 ). The ball receiving section ( 31; 31 A) comprises either one of a conical tapered surface ( 31 ) and a concavely-curved surface ( 31 A). The radius of curvature (Rb) of the concavely-curved surface ( 31 A) is larger than the radius (Ra) of the ball ( 30 ).
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