Sealing device for bearing unit
AssigneeAktiebolaget Skf
InventorsPiero Genualdo, Daniele Duch, Davide Bergesio
Life of this patent
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Abstract
A sealing device for sealing a bearing unit between a stationary radially outer ring and a rotary inner flanged ring against external contaminants. The sealing device includes a rotary metal first shield which has a shaped annular form and is mounted on the flanged ring, a stationary metal second shield which has a shaped annular form and is mounted on the radially outer ring and an elastomer annular sealing element, which is wholly supported by the second shield, the sealing element having an annular contacting lip and a non-contacting lip arranged radially outside the contacting lip. The non-contacting lip has a curved cross-section defined by different radii of curvature and a radially outward-facing concavity.
Claims8
A sealing device for sealing from external contaminants between a stationary radially outer ring and a rotatable inner flanged ring of a bearing unit, the sealing device comprising:
- a first annular shield configured to be mounted on the rotatable flanged ring and formed of a metallic material;
- a second annular shield configured to be mounted on the stationary radially outer ring and formed of a metallic material, the second annular shield including a mounting portion configured to be interference fit to the radially outer ring, a support portion including a first flange portion extending radially toward the first shield and an intermediate truncated cone portion connecting the first flange portion to the mounting portion;
- and
- an annular sealing element integrally supported by the second shield and formed of an elastomeric material, the sealing element having an annular contacting lip carried on the first flange portion and a non-contacting lip located radially external to the contacting lip;
- wherein the non-contacting lip includes a rigid axially inner first portion completely covering the truncated cone portion of the second shield on a side of the shield facing the first shield and a free axially outer second portion projecting from the second shield, the first portion being entirely delimited radially outwardly by a curvilinear surface having a radius of curvature and the second portion being entirely delimited radially outwardly by a curvilinear surface mated to the curvilinear surface of the first portion and having a radius of curvature, the radius of curvature of the curvilinear surface of the first portion being greater than the radius of curvature of the curvilinear surface of the second portion, the two curvilinear surfaces of the first and second portions being joined together to form a concavity in the external radial direction with an approximate semi-circular shape.
Dependencies are inferred from the claim text.