Vibration damping apparatus

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.