Abstract: An elastomeric damper comprises a hub section configured for connection to a rotational shaft requiring damping in an internal combustion engine, and an inertia ring fitted within the hub section. The hub section includes a central region, an annular radially extending section extending radially outwardly from the central region, and an annular axially extending section extending axially with respect to the radially extending section. The axially extending section includes a radially inwardly directed portion.

Abstract: A torsional vibration damper used to dampen harmonic vibration frequencies set up in crank shafts of reciprocating internal combustion engines, the balancer having a hub section (14) to be fitted to the crank shaft requiring balancing the hub section (14) defining an outwardly directed peripheral face (15) having an annular ring (30) of elastomeric material received thereover, the balancer further having an inertia ring (13) press fitted over said elastomeric material ring (30) with an inwardly directed face (35) of said inertia ring (13) engaging said elastomeric material (30), the inertia ring (13) including an inwardly directed member (19) located at one axial end of said inertia ring (13) having a free end located at a radial distance from the axis of rotation of the shaft being balanced less than the radial distance of the peripheral face (15) of said hub section (14) from the axis of rotation, and a plastically deformable member (33) located at the other axial end of said inertia ring (13), said deforma