ANNULAR SEALING ASSEMBLY, IN PARTICULAR FOR WHEEL HUBS

摘要

A sealing assembly comprises a first annular shield presenting an axial sleeve portion for the mounting angularly integral with one of said members, and a flange portion which radially extends from a first end of the sleeve portion, and a sealing member made of elastomeric material presenting an annular root portion, which overhangingly and radially extends from a peripheral edge of the flange portion and a first axially sealing annular lip, as well as a second radially sealing annular lip. The lips extend overhangingly and axially on the opposite side of the first end of the sleeve portion, from a same side as a thinned end of the root portion and are reciprocally and divergingly arranged to form in radial section a V-shape having a vertex facing towards the root portion and an axis parallel to the sleeve portion.

主权项

1. A sealing assembly insertable in a compartment defined by members of a hub bearing unit rotatable relative to each other to isolate the compartment from the external environment, the sealing assembly comprising:
a sleeve portion disposed between the members of the hub bearing unit; a first annular shield presenting an axial sleeve portion having a first end and mounted angularly and integrally with one of the members and a flange portion extending radially from said first end to a peripheral edge; a sealing member made of elastomeric material presenting an annular root portion extending radially and overhangingly from said peripheral edge; a first axial sealing annular lip presenting a sealing edge and a seat to receive a spring mounted so as to apply on said first axial sealing annular lip a radial stress to an elastic hinge defined by a thinned end of an annular root portion and having a center of rotation arranged on a line crossing said sealing edge; a second radial sealing lip extending overhangingly from said thinned end of said annular root portion on the opposite side of said first end of said axial sleeve portion for slidingly engaging said sleeve portion disposed between the members; and a third lip extending overhangingly from said annular root portion in a direction opposite from said first axial sealing annular lip and obliquely with respect to said flange portion thereby forming an X-shape defined between said first axial sealing annular lip, said second sealing radial sealing lip, and said root portion having the centre of rotation for said first axial sealing annular lip arranged in the middle of said X-shape to constantly maintain sealing action even with progressive wear of said first axial sealing annular lip as load is applied to said sealing edge; and said first axial sealing annular lip presenting a cross section having a first distance defined between an outer surface of said first axial sealing annular lip at said seat and an inner surface of said first axial sealing annular lip being substantially equal to a second distance defined at said thinned end of said first axial sealing annular lip between said outer surface and said inner surface of said first axial sealing annular lip thereby improving flexibility of said first axial sealing annular lip at the elastic hinge defined by said thinned end of said annular root portion.