| 摘要 |
A damper mechanism for a lockup device 7 is a device for mechanically transmitting a torque in a torque converter 1. A coil spring 58 is arranged in first and second windows 61 and 62 overlapping with each other, and is compressed in accordance with the relative rotation of drive and driven members 52 and 53. A maximum torsion angle theta m is defined when the coil springs 58 are compressed to a maximum extent by relative rotation between the drive and driven members 52 and 53. Each of the first and second windows 61 and 62 has an outer periphery longer than an inner periphery. Each ends 61a and 62a on the circumferential ends of the first and second windows 61 and 62 form an angle theta with respect to a center line extending through a center O of the damper mechanism and a circumferential center C1 or C2 of the first or second window 61 or 62, and this angle theta is in a range between 0.05 and 0.60 times as large as the maximum torsion angle theta m.
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