Sealing device, in particular for wheel hubs of motor bikes

摘要

A sealing device including an annular reinforcing insert couplable with a wheel hub in use and an annular sealing element carried by the reinforcing insert and including at least one sealing lip cooperating with a spacer carried by a wheel support pin in use; the reinforcing insert delimits an annular chamber arranged directly adjacent to the annular sealing element in axial direction, and the device further includes a shield mounted in floating manner with radial and axial play in the annular chamber, including a first radial end, which extends to the lip and couples in forced manner with the spacer in use, and a second radial end, opposite to the first, which cooperates with the reinforcing insert and with the annular sealing element to create a labyrinth seal in the annular chamber interposed in use between the annular lip and an environment (E) external to the wheel hub.

主权项

1. A sealing device insertable between a first and a second member relatively rotatable with respect to each other about an axis coinciding with an axis of symmetry of the sealing device between a wheel hub and a respective support pin of a motor bike wheel or a spacer assembled on the respective support pin, comprising:
an annular reinforcing insert restrainable in an angularly integral and fluid-tight manner to the first member; and an annular sealing element made of an elastomeric material and having at least one annular lip being elastically deformable and adapted to fluid-tightly cooperate with a radial side surface of the second member, the at least one annular lip extending radially and overhangingly from the annular reinforcing insert up to a first radial position; and
i) an annular chamber defined by the annular reinforcing insert and arranged directly adjacent in the axial direction to the annular sealing element; andii) a shield mounted in the annular chamber and having a first radial end and a second radial end opposite of the first radial end; the first radial end extending up to a second radial position that is axially spaced from the first radial position of the at least one annular lip, wherein the first radial end is configured to cooperate with the radial side surface of the second member, the first radial end configured to be coupled in a forced manner to the second member to restrain the shield in an angularly integral manner to the second member; and the second radial end facing the annular reinforcing insert and cooperating with the annular reinforcing insert and with the annular sealing element to create within the annular chamber a labyrinth seal interposed between the at least one annular lip and an environment external to the first and second member; and whereiniii) the shield is mounted in the annular chamber in a floating manner, with both radial and axial play; andiv) the annular reinforcing insert is made of a plastically deformable metal material and provides a sleeve portion and a flange portion which extends radially and overhangingly from a first end of the sleeve portion, wherein the at least one annular lip extends from the flange portion on a side opposite of the sleeve portion; the annular chamber being delimited between the flange portion and a second end of the sleeve portion that is opposite the first end of the sleeve portion, wherein the second end of the sleeve portion extends radially inwardly such that the sleeve portion forms an L-shape, and such that the annular chamber extends in the radial direction along only a part of the annular sealing element; and whereinv) in a radial cross-section of the shield, the second radial end is delimited by a radial surface extending parallel to the axis of symmetry and by a pair of opposite front radial surfaces perpendicular to the axis of symmetry, each of the front radial surfaces having, at a radial middle portion thereof, a respective annular ridge extending axially and overhanging from their respective front radial surface.