| 摘要 |
A diaphragm spring is formed so as to be elastically deformable between a first shape for maintaining an engaged state for engaging a brake disc with a pressed plate without requiring the continuous operation of a hydraulic cylinder, and a second shape for maintaining a disengaged state for disengaging the brake disc from the pressed plate without requiring the operation of the hydraulic cylinder. Therefore, after the shape of the diaphragm spring is made one of the first shape and the second shape due to temporary operation of the hydraulic cylinder, power for continuously operating the hydraulic cylinder for maintaining the engaged state or the disengaged state is not required. As a result, an energy loss is not caused, and the fuel efficiency is increased.
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