Torque fluctuation inhibiting device and power transmission device

A torque fluctuation inhibiting device comprising:

• a first rotor including an accommodation portion, the first rotor disposed to be rotatable;
• a second rotor disposed to be rotatable with the first rotor and be rotatable relative to the first rotor;
• a centrifugal element disposed in the accommodation portion so as to be radially movable, the centrifugal element configured to receive a centrifugal force generated by rotation of the first or second rotor;
• and
• a cam mechanism configured to receive the centrifugal force acting on the centrifugal element, the cam mechanism further configured to convert the centrifugal force into a circumferential force directed to reduce rotational phase difference between the first rotor and the second rotor, wherein
• the cam mechanism includes
• a cam surface provided on the centrifugal element, and
• a cam follower configured to make contact with the cam surface, the cam follower further configured to transmit a force therethrough between the centrifugal element and the second rotor, and
• the centrifugal element is further configured to be radially moved while rolling on an inner wall surface of the accommodation portion.