| 摘要 |
PROBLEM TO BE SOLVED: To provide a structure hardly causing the distortion of connection arm parts 15c, 15c of a yoke 12c and the loss of a torque transmitting function even when excessive torque is applied, and permitting easy determination of a fact that excessive torque is applied, even afterwards.SOLUTION: The rigidity in the twisting direction of the base part 14c is make lower than that of the connection arm parts 15c on the side provided with the recessed grooves 20, 20, by forming recessed grooves 20, 20 of a base part 14c of a yoke 12c. When excessive torque is applied, the base part 14c is plastically deformed in the twisting direction to restrain the deformation of both connection arm parts 15c, 15c. |
