Vibration damping apparatus

1. A vibration damping apparatus including a support member configured to rotate together with a rotational element, to which a torque is transferred from an engine, about a rotation center of the rotational element, a restoration force generating member coupled to the support member so as to transmit and receive the torque with the support member and configured to swing along with rotation of the support member, and an inertial mass coupled to the support member via the restoration force generating member and configured to swing about the rotation center in conjunction with the restoration force generating member along with the rotation of the support member, the vibration damping apparatus comprising:

a first guide surface provided on the restoration force generating member;

a second guide surface provided on the inertial mass; and

a coupling member having a first rolling portion and a second rolling portion integrated together and arranged so that the first rolling portion rolls along the first guide surface and the second rolling portion rolls along the second guide surface, wherein

the first and second guide surfaces are formed so that the first rolling portion rolls along the first guide surface and the second rolling portion rolls along the second guide surface along with the rotation of the support member to cause the restoration force generating member to swing relative to the rotation center along a radial direction of the support member and cause the inertial mass to swing about the rotation center, and

when the support member rotates, a component force of a centrifugal force acting on the restoration force generating member is transferred from the first guide surface to the second guide surface via the coupling member,

wherein the first and second guide surfaces are formed so that the first rolling portion rolls along the first guide surface and the second rolling portion rolls along the second guide surface along with the rotation of the support member to cause the restoration force generating member to swing relative to the rotation center along the radial direction of the support member and to swing about an imaginary axis defined to have an invariant position relative to the inertial mass.

2. The vibration damping apparatus according to claim 1 , wherein the first guide surface is a concave surface receding toward the rotation center or receding opposite to the rotation center, and the second guide surface is a concave surface receding opposite to the first guide surface.

3. The vibration damping apparatus according to claim 1 , wherein the first and second rolling portions are integrated together so as to extend coaxially with each other, and a diameter of one of the first and second rolling portions is smaller than a diameter of the other one of the first and second rolling portions.

4. The vibration damping apparatus according to claim 3 , wherein

the coupling member has a tapered surface formed between a rim of an outer peripheral surface of the first rolling portion on the second rolling portion side and a rim of an outer peripheral surface of the second rolling portion on the first rolling portion side, and

the tapered surface is inclined farther away from the one of the first and second rolling portions and closer to the other one of the first and second rolling portions with increasing distance from an inner peripheral side to an outer peripheral side.

5. The vibration damping apparatus according to claim 1 , wherein

the restoration force generating member has two pieces of the first guide surface arranged symmetrically across a center line in a width direction of the restoration force generating member, and

the inertial mass has a plurality of pieces of the second guide surface formed in association with the pieces of the first guide surface of the restoration force generating member.

6. The vibration damping apparatus according to claim 5 , wherein the restoration force generating member has a torque transfer portion arranged on the center line and configured to transmit and receive the torque with the support member.

7. The vibration damping apparatus according to claim 1 , wherein the support member is arranged between at least a part of the restoration force generating member and at least a part of the inertial mass in an axial direction.

8. The vibration damping apparatus according to claim 7 , wherein

one of the restoration force generating member and the inertial mass includes two plate members coupled together so as to face each other at a distance in the axial direction,

the support member includes two support plates arranged side by side in the axial direction between the two plate members, and

the other one of the restoration force generating member and the inertial mass is arranged between the two support plates in the axial direction.

9. The vibration damping apparatus according to claim 1 , wherein the support member is configured to rotate coaxially and together with any rotational element of a damper apparatus including a plurality of rotational elements including at least an input element and an output element, and an elastic body configured to transfer the torque between the input element and the output element.

10. The vibration damping apparatus according to claim 9 , wherein the output element of the damper apparatus is actively coupled to an input shaft of a transmission.