Integrated pulley-torsional damper assembly
An integrated pulley-torsional damper assembly ( 1 ) comprises a hub ( 2 ) designed for being rigidly connected to a drive member ( 3 ), a pulley ( 4 ) connected to the hub ( 2 ) by means of a first ring ( 5 ) made of elastomeric material having the function of filter for the torsional oscillations, and an inertia ring ( 6 ), connected to the hub ( 2 ) by means of a second ring ( 7 ) made of elastomeric material, which defines with the inertia ring ( 6 ) a damping system. The first elastomeric ring is connected to the hub by mans of a coupling flange ( 25 ), which can be pack-tightened between an internal annular flange ( 10 ) of the hub and the drive member ( 3 ), the hub ( 2 ) comprising a first cylindrical wall ( 11 ) and a second cylindrical wall ( 12 ), which are coaxial with respect to one another and define between them an annular cavity ( 9 ) housing the first elastomeric ring ( 5 ), the external cylindrical wall ( 12 ) defining a support for the second elastomeric ring ( 7 ).
1. An integrated pulley-torsional damper assembly including a hub designed for being rigidly connected to a drive member, a pulley connected to the hub by means of a first elastomeric ring having the function of a filter for torsional oscillations, an inertia ring connected to the hub by means of a second elastomeric ring defining with the inertia ring a damping system, said hub comprising an internal annular flange designed for connection to said drive member and an annular coupling portion integral with said internal annular flange, said annular coupling portion integrally including a first tubular wall connected to and extending axially from said internal annular flange, a second tubular wall coaxial and radially external to the first tubular wall, and an end wall connecting said first tubular wall to said second tubular wall at an axial end thereof opposite to said annular flange, said first tubular wall, second tubular wall and end wall defining an annular cavity which has an open axial end on the side where said internal annular flange is located, said pulley comprising a peripheral crown and a flange extending radially inwards from said peripheral crown and including an outer annular portion, an intermediate tubular wall coaxial with respect to said crown and extending coaxially inside said second tubular wall of said hub, and an inner annular flange extending radially inwards from an axial end of the intermediate tubular wall opposite to the outer annular portion and adjacent said end wall of said annular coupling portion, the assembly comprising a coupling flange provided with an inner annular wall bearing axially against said flange of said hub and with a peripheral annular edge located at said open end of said annular cavity and facing said inner annular flange of said pulley, wherein said first elastomeric ring is set axially between said inner annular flange of said pulley and said peripheral annular edge of said coupling flange and forms a single body with them; and wherein said inertia ring is contained inside said crown of said pulley and supported on said second tubular wall of said hub via said second elastomeric ring, said first elastomeric ring is housed within said cavity of said annular coupling portion, and a bearing is set between said second tubular wall and said pulley for radial and axial support of said pulley with respect to said hub.
2. The assembly according to claim 1 , characterized in that said bearing comprises integrally a tubular portion, radially set between said outer tubular wall of said hub and said intermediate tubular wall of said pulley, and a flange axially set between said outer annular portion of said flange of said pulley and said outer tubular wall of said hub.