and the surface 12 any relative circumferential displacement of hub 1 and inertia member 2 will subject the elastomeric element 3 not only to a tangential stress but also to compression and tensile stress the same configuration as shown in fig1 a for the face 10 and the juxtaposed surface 12 is also provided on the surface 13 and the face 10 that is juxtaposed therewith fig2 shows a further embodiment in which the hub member 20 is concentrically surrounded by an inertia member 21 and a flange 22 of the hub member 20 has its undulating surface 22a joined to a similar undulating surface 24 of the inertia member 21 by means of an interposed annular elastomeric member 23 which may be connected to these surfaces as described with respect to fig1 the undulating surface portions corresponding to those shown in fig1 a are identified with reference numeral 40 in fig2 at the opposite axial side the flange 22 is provided with a further undulating annular surface 22b which is juxtaposed with a similar undulating surface 25 on an annular member 26 a further elastomeric annular member 23 being interposed between and connected to these surfaces also again as before by bonding by vulcanization by polymerization or merely by frictional contact the requirement that opposite surface portions of juxtaposed surfaces must extend parallel to one another as for the portions 10a and 12a in fig1 a obtains in fig2 also the element 26 is mounted axially displaceable but nonrotatable on the hub member 20 the inertia member 21 being provided with a guideway 27 extending axially and into which.