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Annular seal (1) for a cylinder neck (3) of a rolling cylinder (2) including an annular body (8) made of elastomeric material, carrying two respective annular lips (13b,c) configured to apply a dynamic sliding seal in use on a fixed annular element (14) of a sealing assembly (17) for the rolling cylinder; in which each lip (13b,c) includes an annular root portion (19), an annular middle portion (20) carried obliquely cantilevered by the root portion, an annular head portion (21) carried cantilevered by the annular middle portion (20) and having an annular sealing ridge (22) and an annular stiffening rib (24) opposite the annular ridge, and an annular hinge portion (26) configured to allow a relative rotation between the root portion (19) and the middle portion (20) to determine a double hydraulic sealing contact against the fixed annular element (14), by means of the annular ridge (22) and an extrados stretch (25) of the annular middle portion (20).

A hub-bearing unit having an axis of rotation includes a radially outer ring configured to be stationary, a flanged hub inside the radially outer ring configured to rotate relative to the axis and relative to the radially outer ring, a radially inner ring mounted on the flanged hub in axial abutment with a shoulder of the flanged hub, a front toothing configured to receive a driving torque from a joint, and a retainer configured to receive and form a snap fit seal with an elastic ring connected to the joint, the retainer being located on a radially external cylindrical surface of the radially inner ring and comprising a shaped metal insert and an elastomeric element vulcanized onto the metal insert.

Absorbing device (1) for reducing noise vibrations, suited to be applied to at least one separating structure for absorbing and/or reducing noise vibrations susceptible to crossing through or be propagated by said separating structure; said absorbing device (1) comprising at least one elastically yielding layer (2), extending along a thickness direction (Z) between a base end (3) and a top end (4), opposite to said base end (3); said absorbing device (1) being characterized in that said elastically yielding layer (2) comprises spring means (5) connecting said base end (3) and said top end (4); said absorbing device (1) comprises at least one mass layer (6) mechanically connected to said top end (4), provided with a predetermined mass or density and configured to increase the mass distributed on said top end (4) of said elastically yielding layer (2); said spring means (5) of said elastically yielding layer (2) are tuned along with the mass or density of said mass layer (6) so as to reduce the amplitude of noise vibrations at least at a predetermined frequency.