| 摘要 |
<p>PURPOSE:To improve durability of a rubber-made seal member mounted to a piston by providing a press moving shaft, protrusively provided in the first friction pad, slidably penetrating through a side wall and the second friction pad opposed facing to the first friction pad. CONSTITUTION:When working fluid is forced to be fed to a pressure oil chamber 15 in a hydraulically-operated mechanism M1, a brake disk 6 is held by pressure between both friction pads 91, 92, applying a brake to a driven shaft 3, accordingly a wheel. Following this brake applied, friction heat is generated between the brake disk 6 and the first friction pad 91, but a hydraulic cylinder 14 and a piston 13 are separated from the first friction pad 91 while dispersedly radiating the friction heat transmitted to a housing 1 through a back plate 101 and a press moving shaft 181, so that the friction heat is prevented from being transmitted to the hydraulic cylinder 14 can be piston 13. Thus, durability can be improved of a rubber-made seal member 19 mounted to the piston 13.</p> |
