Sealing assembly, system for engagement with bearing ring, and wheel-hub unit equipped with such assembly

Abstract

A low-friction sealing assembly can be inserted in an annular space defined between a flanged rotating element and a stationary element so as to protect rolling members. The rotating element is provided with a flange and a mounting seat delimited by a cylindrical bottom wall and by an axial shoulder arranged on the opposite side to the flange. The sealing assembly comprises an annular screen thatis provided with: a sleeve portion that is integral with the rotating element inside the mounting seat during use and is delimited by a lateral mounting surface in relation to the rotating element; and a flange portion radially projecting from the sleeve portion; wherein the nominal dimensions of an internal diameter of the sleeve portion of the annular screen are substantially the same as the nominal dimensions of an outer diameter of the cylindrical bottom wall of the mounting seat, and the axial shoulder has an entry edge with a substantially conical form for facilitating mounting of the annular screen on the rotating annular element, and a radial thickness with respect to the outer diameter of the cylindrical bottom wall of the mounting seat with dimensions such as to prevent a plasticdeformation of the sleeve portion of the annular screen during the mounting step.

Description

technical field [0001] The invention relates to a low-friction sealing assembly, especially for rolling bearings equipped with wheel hub units for vehicles. The invention also relates to a system for the engagement between elements of a sealing assembly and a running ring of a rolling bearing forming part of a wheel hub unit and a wheel hub unit ( / hub unit) so equipped. Background technique [0002] Seal assemblies, such as those described in US8303190 and US2012 / 0177315, intended for rolling bearings equipped with wheel hub units on the so-called "outer" or "external" flange side supporting the wheel, are composed of so-called "cassette" A seal is formed comprising a first annular shroud and a second annular shroud having a substantially L-shaped radial section and mounted facing each other such that an annular chamber is defined between the shrouds, inside the annular chamber A series of sealing lips are arranged mounted on a fixed annular seal integral with one of the sh...

AI Technical Summary

Problems solved by technology

Therefore, during installation, the shield must try to axially pass ( / over) (pass beyond) the axial stop before being positioned in the mount 20, and it has been found that, in some cases, this passing movement Tends to plastically deform the shroud, subsequently causing a loosening of the engagement connection between the shroud and the mount 20, an additional disadvantage is that the shroud tends to rotate relative to the mount 20 and around its own axis due to the deformation

[0004] On the one hand, these disadvantages increase the friction acting on the sealing assembly, because the sealing lip that is not in sliding contact (and therefore no friction) may be in sliding contact (and therefore friction) and the sealing lip that may be of the sliding contact type increases. increase their interference, thus creating friction

Furthermore, in the event of relatively large displacements or rotations, interference may arise between the rotating shield and the stationary ring of the bearing, creating very high friction levels and possible damage to the seal assembly, even in the worst case Scenarios that cause damage to the rolling elements of the bearing

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