LOCK-UP DEVICE FOR TORQUE CONVERTER

摘要

PROBLEM TO BE SOLVED: To provide a lock-up device for a torque converter, certainly suppressing vibration caused by a coil spring.

SOLUTION: This lock-up device 7 includes a plurality of large torsion springs 74, a plurality of medium torsion springs 75, and a plurality of small torsion springs 76. The free lengths of the plurality of small torsion springs 76 are respectively set to be shorter than any one of the large torsion springs 74 and medium torsion springs 75. The plurality of small torsion springs 76 are movably individually arranged on the inner periphery of any one of the large torsion springs 74 and medium torsion springs 75. The plurality of small torsion springs 76 are compressed in a rotational direction by relative rotation at a second torsional angle θ2 or more, larger than a first torsional angle θ1.

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