Patent ID: 8978853
Filing Date: 2015-03-17
Classification: F16D,F16F,F16H

Abstract:
1. A lock-up device for a torque converter to transmit a torque and absorb and damp a torsional vibration, comprising: an input rotary member; an output rotary member configured to be rotated around a rotation axis relatively to the input rotary member; a first coil spring to which the torque is transmitted from the input rotary member; a second coil spring disposed closer to the rotation axis than the first coil spring to the rotation axis in a radial direction, the second coil spring being configured to transmit the torque and act in series with the first coil spring; and a third coil spring disposed further from the rotation axis than the second coil spring from the rotation axis in the radial direction, the third coil spring being configured to transmit the torque and act in series with the second coil spring, the third coil spring being configured to transmit the torque to the output rotary member, the torque being transmitted from the input rotary member to the output rotary member, in order, through the first coil spring, the second coil spring and the third coil spring.