| 摘要 |
A dual-type damper device for damping vibration of a rotation axle, has a damper pulley including a boss portion joined to the rotation axle, a cylindrical portion located radially outwardly of the boss portion, and a connection portion connecting the boss portion and the cylindrical portion. A first damper-mass member is disposed radially outwardly of the cylindrical portion of the damper pulley, such that the first damper-mass member is spaced apart from, and concentric with, the cylindrical portion. A first resilient member is interposed between the cylindrical portion of the damper pulley and the first damper-mass member. A second damper-mass member has a cylindrical shape and is disposed concentrically in an inner space of the cylindrical portion of the damper pulley. A second resilient member is disposed between one of axial ends of the second damper-mass member and a corresponding part of the connection portion of the damper pulley which is opposed to the one axial end of the second damper-mass member, so as to secure the second damper-mass member to the connection portion, the second resilient member being subjected to shear deformation thereof due to relative radial displacement between the second damper-mass member and the connection portion of the damper pulley.
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