Patent ID: 7353923

Claim:
A damper device comprising: a housing, a viscous fluid filled in the housing, a rotor rotatably disposed inside the housing, a sealing member disposed between the housing and the rotor for preventing the viscous fluid from leaking therebetween, a rotational wing device with a viscous-fluid passage device provided on one of the housing and the rotor, said rotational wing device moving relative to the viscous fluid in a circumferential direction and extending in a radial direction for dividing the housing, and a valve device provided on the rotational wing device, said valve opening the viscous-fluid passage device when the rotor rotates in one direction and blocking the viscous-fluid passage device when the rotor rotates in the other direction, wherein said valve device is formed of an elastic member capable of deforming elastically and includes an axis portion at one side thereof so that the valve device rotates around the axis portion when the rotor rotates.