| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce the number of part items, reduce the number of the fitting processes, and prevent generation of galling on a spring guide part even when the elastic force of a spring is applied. SOLUTION: An annular piston 12 consists of a cylindrical member, and a piston pressing part 12a is composed of an end part of the cylindrical member. Spring guide part 12b to which one end 14a of a spring 14 is connected are composed of a part which is axially cut with the prescribed width in the circumferential direction, and the part of the prescribed width is bent outwardly in the radial direction at a plurality of positions with the prescribed intervals in the circumferential direction of the piston pressing part 12a. The other cylindrical end part of the annular piston 12 is folded in approximately U-shaped section outwardly in the radial direction to form a hydraulic pressure applying part 12c, a tip of a piece on the outer diameter part of approximately U-shaped section is brought into contact with the circumference to connect the axis of the spring 14 of the spring guide part 12b, and constitutes a box structure together with the spring guide part 12b to constitute a supporting part 12e to support the spring guide part 12b.</p> |
