| 主权项 |
1. A drip element sealing device for rolling bearings of wheel hub assemblies, adapted to be inserted between a first member and a second member in relative rotation for fluid-sealingly insulating from an external environment an annular cavity defined between the first member and the second member, the sealing device having a symmetry axis (A) and comprising:
a first annular shield angularly integrally constrainable to the first member by a respective sleeve portion for rotating with the first member about the symmetry axis (A) and defining an axially outer shield of the sealing assembly with respect to the annular cavity; a second annular shield angularly integrally constrainable to the second member, coaxial to the first shield, by means of a respective sleeve portion, and defining an axially inner shield of the sealing assembly with respect to the annular cavity; the second annular shield and the first annular shield defining between them an annular chamber delimited on opposite sides, in a radial direction, by the sleeve portions, and, in the axial direction, by respective flange portions of the first annular shield and second annular shield arranged reciprocally facing, the flange portion of the first annular shield delimiting the annular chamber towards the external environment (E); and a sealing ring integrally supported by the second annular shield and provided with at least a first annular lip and a second annular lip that extend axially and radially projecting from the flange portion of the second annular shield and towards the flange portion of the first annular shield, inside the annular chamber; wherein: i) the first annular lip and the second annular lip cooperate with the flange portion of the first annular shield without touching the flange portion of the first annular shield, and define a first dynamic labyrinth seal with the flange portion of the first shield and inside the annular chamber; ii) the first shield integrally supports a third annular lip that extends projecting from the first shield towards the first annular lip and the second annular lip without touching the first annular lip and the second annular lip, in a radially intermediate position between the first annular lip and the second annular lip, for defining a second dynamic labyrinth seal between the first shield and second shield and inside the annular chamber; iii) the first annular lip, the second annular lip and the third annular lip define, in a radial direction, respective first annular drip element, the second annular drip element and the third annular drip element arranged in succession in series in a radial direction and delimiting, inside the annular chamber, a plurality of respective cavities; and wherein: iv) the first annular lip is shaped in radial section as an upper case U, while the third annular lip shaped in radial section as a lower case U and the second annular lip is shaped in radial section as an asymmetric V; v) a radially outer edge of the flange portion of the first shield, which is opposite to the sleeve portion, is shaped to define, towards the annular chamber and on an opposing side with respect to the external environment (E), a first axial annular projection axially delimited towards the second annular shield by a first annular surface transversal to the axis (A), which is arranged axially projecting towards the second annular shield with respect to the first annular lip to be arranged axially within the axial width of a recess constituting the first drip element; vi) the first annular lip is axially delimited towards the first shield by a second annular surface transversal to the axis (A) and arranged axially projecting towards the first annular shield with respect to a free end edge of the third annular lip to be arranged axially within the axial width of a recess constituting the second drip element; vii) the conformation and position of the third annular lip is such to arrange the free end edge thereof, which is I-shaped in radial section, axially within a recess constituting the third drip element. |
