Patent ID: 8627934

Claim:
A fluid transmission device comprising: a front cover to which driving force of a driving source is transmitted from an input member; a pre-damper that has a first elastic body, and transmits the driving force to the front cover via the first elastic body; a fluid transmission unit that includes a pump connected to the front cover and a turbine, and is operable to transmit the driving force transmitted to the pump, to the turbine, via a hydraulic fluid; a piston member that is disposed between the front cover and the fluid transmission unit, and delivers the driving force to an output member; a dynamic damper that has a second elastic body, and is connected to the piston member and the turbine via the second elastic body; and a clutch control device, wherein: a part of the turbine and a part of the piston member provide a turbine clutch, and are engaged with each other when the turbine clutch is in an engaged state; a part of the front cover and another part of the piston member provide a lock-up clutch, and are engaged with each other when the lock-up clutch is in an engaged state; and the clutch control device controls the lock-up clutch and the turbine clutch.