| 摘要 |
PURPOSE:To reduce frequency of noise generation at the time of braking by inserting a compression spring made of shape memory alloy in a recession of a part near the outer periphery of a rotor on the internal side face of a caliper pawl and elastically pressing a part near the outer periphery of a pad towards a rotor only when the temperature is high. CONSTITUTION:A compression spring 6 made of shape memory alloy exhibits its configurations A and B under the normal temperature and the high temperature respectively. Such a compression spring 6 is used in a configuration inserted in a recession 7 formed on the upper internal side face of a caliper pawl 4a, and the internal side face of which is in contact with the back side of one pad 3. Since the compression spring 6 contained in the recession is short in its full length at the normal temperature, the pad 3 is not elastically pressed by said spring 6, however, when the temperature of the pad 3 is raised, the spring 6 is growing larger in its full length and elastically presses a part near the rotor outer periphery of the pad 3. This pressing force is larger on the outer peripheral side part of the rotor than the inner peripheral side part. Thus, generation of noise can be effectively prevented at a high temperature when the noise is easily generated during braking action. |
