PROBLEM TO BE SOLVED: To provide a centrifugal pendulum dynamic vibration absorber capable of suppressing the contact between a rolling element and a rolling chamber.;SOLUTION: The centrifugal pendulum dynamic vibration absorber 1 includes a rotor 10 and the rolling element 50. The rotor 10 is rotatably provided. The rolling chamber 40 is formed in the rotor 10. The rolling element 50 is rotatably stored in the rolling chamber 40. An annular projection 53 is formed in a cylindrical surface-like rolling surface 52 of the rolling element 50. An annular groove 43 is formed in a cylindrical surface-like track surface 42 of the rolling chamber 40. The rolling element 50 is disposed in the rolling chamber 40 so that a projection 53 may be fitted into the groove 43. The space dimension between side faces 56, 57 of the projection 53 in the axial direction of the rolling surface 52 and the side faces 46, 47 of the groove 43 is changed when the rolling element 50 is rolled in the rolling chamber 40 along the track surface 42.;COPYRIGHT: (C)2011,JPO&INPIT
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