Dual-type damper device

Abstract

A dual-type damper for damping vibration of a rotation axle, having 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 and cylindrical portions; a first damper mass disposed radially outwardly of the cylindrical portion, concentrically with the same; a first resililent member interposed between the cylindrical portion and the first damper mass; and a metallic annular member press-fitted onto an inside surface of the cylindrical portion. A second damper mass having a cylindrical shape is disposed between the connection portion and the annular member, in an inner space of the cylindrical portion, concentrically with the cylindrical portion; is (f) a second resilient member disposed between the annular member and one axial end of the second damper mass, so as to secure the second damper mass to the annular member. A dual-type damper of another embodiment has a damper pulley including a cylindrical portion; a first damper mass; a first resilient member; a second damper mass having a cylindrical shape and disposed in an inner space of the cylindrical portion; a second resilient member supporting the second damper mass at one axial end of the same; and a third resilient member mounted on an outside surface of the second damper mass, or on an inside surface of the cylindrical portion.