Patent ID: 8568243

Claim:
A flywheel assembly, comprising: a first rotary member configured to be rotated in a rotational direction around an axis; a second rotary member being configured to be rotated around the axis with respect to the first rotary member; a pair of first elastic members, one of the first elastic members being a first spring member, the other of the first elastic members being a third spring member; a pair of second elastic members, one of the second elastic members being a second spring member, the other of the second elastic members being a fourth spring member; and a first seat member being configured to support an end portion of the first spring member and being outwardly pushed against the first rotary member in a direction away from the axis, the first spring member being configured to connect elastically the first rotary member and the second rotary member in the rotational direction and arranged between the first rotary member and the second rotary member in a pre-compressed state, the first spring member having first stiffness, the second spring member being configured between the second rotary member and the first rotary member in a pre-compressed state, the second spring member having second stiffness being lower than the first stiffness, the second spring member being arranged to expand or to be compressed in series with the first spring member, the third spring member being configured to connect elastically the first rotary member and the second rotary member in the rotational direction and arranged between the first rotary member and the second rotary member in a pre-compressed state, the third spring member having the first stiffness, the fourth spring member being configured between the second rotary member and the first rotary member in a pre-compressed state, the fourth spring member having the second stiffness, the fourth spring member being arranged to expand or to be compressed in series with the third spring member, the first and third spring members being configured between the second and fourth spring members in the rotational direction.