Lock-Up Device For Torque Converter

Abstract

A lock-up device for a torque converter for transmitting a torque and for absorbing and attenuating a torsional vibration includes an input rotary member, an output rotary member disposed on both axial sides of the input rotary member and rotatable relatively to the input rotary member, and a plurality of first coil springs disposed in radially inner positions. The first coil springs are compressed in series by rotation of the input rotary member relative to the output rotary member whereby the torque is inputted therein from the input rotary member. The lock-up device also includes at least one second coil spring compressed when the input rotary member and the output rotary member are rotated relatively to each other at a predetermined relative angle or greater. The lock-up device additionally includes a float member disposed radially inward of the first coil springs and coupling the plural first coil springs in series.

Dependencies are inferred from the claim text.