Patent ID: 8038554

Claim:
An isolation damper pulley attached to a crankshaft of an engine, comprising: a damper unit including a hub having a mounting hole for placement on said crankshaft, an inside cylindrical portion provided to said hub so as to be concentric with a center axis of said mounting hole, an annular mass body attached to an outside cylindrical portion provided to said hub via a first elastic member, and a disk portion provided so as to extend radially from said inside cylindrical portion to said outside cylindrical portion; a pulley portion including a cylindrical portion, in an outer circumferential portion of which a pulley groove is formed and which is disposed outside said annular mass body, and a cover portion extending from one axial-directional end of said cylindrical portion in a central direction; a second annular elastic member whose one axial-directional end is fixed to an inner face of a radial-inner portion of said cover portion, whose other axial-directional end is supported by said disk portion, and to which a pre-compression is applied axially; and a pressing unit having a cylindrical fitting portion that is concentric with said center axis and is positioned between an inner circumferential surface of said second annular elastic member and an outer circumferential surface of said inside cylindrical portion, and a pressing portion extending radially from said cylindrical fitting portion, said cover portion being axially pressed by said pressing portion, and said pressing unit applying an axial-directional pre-compression to said second annular elastic member, wherein said cylindrical fitting portion of said pressing unit is axially press-inserted into said inside cylindrical portion of said damper unit so as to be fitted coaxially, and a fixing position of said pressing unit is capable of being adjusted axially with respect to said inside cylindrical portion of said damper unit.