| 摘要 |
A plate 5 fastened to a D-cut section 3c of a rotation shaft 3 by caulking has an engaging hole 5b provided therethrough. Further, a positioning protrusion 4c for engaging the engaging hole 5b is provided in a leaf spring 4 sandwiched between the rotation shaft 3 and the plate 5. The inclination theta1 of the leaf spring 4 made by the amount of a clearance B between the engaging hole 5b and the positioning protrusion 4c that are distant from the rotation central axis X is smaller than the inclination theta2 made by the amount of a clearance A between the D-cut section 3c and the straight portion 4d that are close to the rotation central axis X. Thus, the backlash in the rotation direction of the leaf spring 4 can be reduced by providing the positioning protrusion 4c and the engaging hole 5b. |
