Tuned torsional vibration damper

Claim 1

A tuned viscous torsional vibration damper comprising: a central hub for connecting the damper to a rotatable shaft; a hollow cylindrical housing with a circular inner wall surrounding the hub, a circular outer wall, and disc-shaped side walls; an annular-shaped inertia disc within the housing with two slots extending outwardly from the inner wall of the housing; a bearing between the inner wall of the housing and the inertia disc for rotation of the inertia disc within the housing; silicone fluid between the disc and the housing; two abutment plates connected to the inner wall of the housing and extending radially outwards into the slots in the inertia disc; disc tuning means comprising four coil springs, each coil spring extending between the disc and one of the abutment plates perpendicularly to the one abutment plate; a ring surrounding the hub and radially spaced-apart therefrom, the inner wall of the housing being mounted on the ring; and housing tuning means comprising a plurality of spoke springs fixedly connected to the hub at a first end, extending radially outwards between the hub and the ring and fixedly connected to the ring at a second end.