| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a structure in which coupling arm parts 15c, 15c of a yoke 12c are hard to be distorted and a torque transmission function is hard to be lost even in a case where excessive torque is applied, and which can easily determine the fact that the excessive torque is applied later.SOLUTION: Recess grooves 20, 20 of a base part 14c of a yoke 12c are formed, and thereby rigidity in a torsional direction of the base part 14c is lower than rigidity in a torsional direction of a coupling arm part 15c in which the recess groove 20, 20 exist. When excessive torque is applied, the base part 14c is plastically deformed in the distortional direction to suppress the deformation of the coupling arm parts 15c, 15c.</p> |
