| 摘要 |
A curved portion, which has a curved cross section, is formed at the recess of the pad. The curved portion has a contact portion which contacts the tension surface of the leaf spring, which is disposed so as to face the curved portion, in an initial condition. The curved portion has a thickness which is reduced from the contact portion to an end portion of the curved portion, thereby being spaced from the tension surface of the leaf spring. In the pad, the height of the curved portion of the recess is set such that contact of the tension surface of the leaf spring and the corner portion of the end portion of the curved portion can be avoided when the stroke length of the end portion of the leaf spring is at maximum. Thus, the tension surface of the leaf spring is not worn by the corner portion of the end portion of the curved portion. As a result, breakage of the leaf spring, which may be caused by wear, can be prevented. |
