| 摘要 |
A lock-up mechanism 7 of a torque converter 1 has a piston 44 with a lock-up damper 45. The lock-up damper 45 includes a drive member and a hub flange 53 with the elastic members or torsion springs 54 operatively coupled therebetween to dampen vibrations in the torque converter 1. The drive member and the hub flange 53 both have a plurality of window holes 56d, 57d and 58 that are arranged circumferentially for receiving the corresponding torsion springs 54. The drive member includes a clutch plate 56 and a retaining plate 57. The clutch plate 56 of the drive member has a plurality of holes or cutouts 56e arranged radially outward of the window holes 56d. These holes or cutouts 56e are arranged to reduce the weight of the clutch plate 56, while maintaining the stresses around the window holes 56d of the clutch plate 56 within an allowable stress range. The retaining plate 57 of the drive member also has a plurality of holes or cutouts 57e that are arranged radially outward of the window holes 57d. These holes or cutouts 57e are arranged to reduce the weight of a retaining plate 57, while maintaining the stresses around the window holes 57d of the retaining plate 57 within an allowable stress range. The hub flange 53 of the lock-up damper 45 also include a plurality of holes or cutouts 59 that are circumferentially arranged between the window holes 58 in the hub flange 53. These holes or cutouts 59 are arranged to reduce the weight of a hub flange 53, while maintaining the stresses around the window holes 58 of the hub flange 53 within an allowable stress range.
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