Series compound torsional vibration damper

1,066,735. Torsional vibration dampers. WALLACE-MURRAY CORPORATION. Jan. 10, 1966 [Feb. 12, 1965], No. 1035/66. Heading F2S. A torsional vibration damper comprises a driving member 10 adapted to be connected to a rotating shaft, e.g. the crank-shaft of an internal-combustion engine, and a first driven inertial member 18 concentrically mounted with respect to the driving member and connected thereto by a first elastic means 19. A second inertia member 22 is provided concentrically mounted with respect to the first inertia member and connected thereto by a second elastic means 19. The inertia members 18, 22 and the driving member 10 may be formed with heat dissipating fins 24, 16. In a modification (Fig. 3, not shown), the inertia members have approximately the same outer diameter being both formed with belt-driving grooves. The second inertia member is mounted on an axially extending flange extending from the internal diameter of the first inertia member. Further, both inertia members may be mounted within the radial extent of the driving member (Fig. 4 not shown) or the first inertia member may be U-shaped, one limb of the U being mounted outside an axially extending annular flange of the driving member with the second inertia member being mounted radially outside the first member (Fig. 5, not shown), the other limb being mounted inside the annular flange which other limb may have the second member attached thereto (Fig. 6, not shown). The embodiment shown in Fig. 2 may have the elastic means of " gull-wing " shaped crosssection (Fig. 7, not shown), the point extending radially outwardly. In a further embodiment (Fig. 8, not shown) the driving member is pro- vided at its outer periphery with an annular U-shaped groove in which is mounted firstly a U-shaped cross-section, annular elastic means, followed by the leg portion of a T-shaped cross-section annular first inertia member. The second inertia member is mounted concentrically about the cross-piece of the T.