| 摘要 |
A torsion vibration damping apparatus can prevent the strengths of its projection portions from being decreased even if the torsion vibration damping apparatus is made small in size, and can damp torsion vibration caused by a transitional torque when a hub member is rotated in the positive side relatively rotated with respect to a rotation member, thereby making it possible to enhance a damping property of the torsion vibration. The projection amount of a projection portion 40A circumferentially projecting in the positive side from the radially center axis O of the projection portion of a hub flange 40 is formed smaller than the projection amount of the projection 40A circumferentially projecting in the negative side from the radially center axis O of the projection portion. The distance L1 between the positive side surface 40b of the projection portion 40A and the stopper portion 48 is longer than the distance L2 between the negative side surface 40c of the projection portion 40A and the stopper portion 48 when the hub member 31 and the disc members 32, 33 are at their neutral positions.
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