Abstract: A fluid coupling includes a cover, an impeller, a turbine, an output hub, a lock-up piston, and a wall member. The impeller is fixed to the cover. The turbine is disposed opposite to the impeller. The output hub outputs a torque transmitted thereto from the turbine. The lock-up piston is disposed between the cover and the turbine. The lock-up piston is disposed to be axially slidable on the output hub. The lock-up piston is configured to be engaged by friction with the cover. The wall member is attached to the output hub. The wall member defines a hydraulic chamber in cooperation with the lock-up piston.

Abstract: A damper apparatus includes a drive plate, a driven plate, torsion springs, and spring housing portions. The torsion springs each have a large arc spring and a small arc spring, and elastically couple the drive plate and the driven plate in the rotation direction and transmit torque. The spring housing portions have a support surface that can support the outer periphery of the large arc springs, and the support surface comes into contact with the outer periphery of the central portions, in the lengthwise direction, of the large arc springs. Also, gaps exist between the support surface and the outer periphery of the two end portions, in the lengthwise direction, of the large arc springs.

Abstract: A damper apparatus includes a drive plate, a driven plate, torsion springs, and spring housing portions. The torsion springs each have a large arc spring and a small arc spring, and elastically couple the drive plate and the driven plate in the rotation direction and transmit torque. The spring housing portions have a support surface that can support the outer periphery of the large arc springs, and the support surface comes into contact with the outer periphery of the central portions, in the lengthwise direction, of the large arc springs. Also, gaps exist between the support surface and the outer periphery of the two end portions, in the lengthwise direction, of the large arc springs.