US Patent 8641537 Damper mechanism

A damper mechanism includes a first flywheel, an output plate, a first spring assembly and a second spring assembly. The first spring assembly is disposed between a first support part and a transmission part in a preliminarily compressed state. The second spring assembly is disposed between a second support part and the transmission part in a preliminarily compressed state. The stopper part is disposed for making contact with the first spring assembly and the second spring assembly in the rotational direction. Gaps are reliably produced in the rotational direction between the stopper part and both of the first spring assembly and the second spring assembly in a neutral state of applying no external force to the first flywheel and the output plate.