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US 4,792,242 AGranted
Tight bearing suitable for exceptionally heavy duty conditions
AssigneeRIV-SKF Officine di Villar Perosa S.p.A.
InventorsFranco Colanzi, Angelo Vignotto
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AssigneeRIV-SKF Officine di Villar Perosa S.p.A.
InventorsFranco Colanzi, Angelo Vignotto
Estimating the term…
A tight bearing suitable for exceptionally heavy duty conditions is supplied with side screens (14) made of a plate composition (16) which is restrained to the external ring (10) of the bearing and forms a labyrinth seal against the internal ring (11), and of plastic and elastomer materials (15) supplied with a lip (17) which creates friction on the internal ring (11); other plates (18) are assembled externally with respect to the screens (14) and are integral on the internal ring (11) and form a labyrinth seal (23) with the external ring (10) of the bearing; the internal face of the external plates (28) is lined with a layer of plastic and elastomer material (19) from which at least one lip (20) extends and forms an essentially axial seal against the external face of the plate (16) of the internal adjacent screen (14); the lip (20) of the layer (19) which lines the internal face of the external plates (18 ) slips and seals along a certain length (21) of bent conical converging internal plate (16) towards the internal ring (11) and towards the external part of the bearing.
Tight bearing suitable for exceptionally heavy duty conditions which comprises:
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
No related US applications are recorded in the indexed filing history.
Mounted to a groove in the inner surface of the outer race and extending toward the inner race: with a further sealing element
With a diaphragm, disc, or ring, with or without resilient members: with two or more discrete sealings arranged in series
Comprising two casing or support elements, one attached to each surface, e.g. cartridge or cassette seals: the elements being separable from each…
For radial load mainly: with a single row or balls
Term ended 25 Jan 2008 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
The invention refers to a tight bearing suitable for particularly heavy duty conditions.
The bearings appointed to heavy duty operations are those as an example, assembled on the rotating parts of earthworks machines.
In these applications some elements like sand, stones, pebble gravel, mud, vegetable fibers, are very hard on the resistance and tightness of the bearing during all its operating life. At present, the bearings appointed to particularly heavy duty conditions are generally of the type having a multi-contact rubber seal, that is consisting of a central body restrained to the plate that acts as a screen, from which several abreast lips extend and form a seal on the rotating element. Alternatively, several abreast rubber rings are assembled in the respective housings of the screen-plate instead of a central rubber body.
A description of two types of the bearing follows and reference must be made to the enclosed drawings: The two types are meant to be examples of, but not limiting to the present invention.
FIG. 1 is the part section view of the bearing according to the first embodiment of the invention.
FIG. 2 represents the view as in FIG. 1 of the bearing according to the second embodiment of the invention.
As it is well known, a revolving element consists of an external ring (10), an internal ring (11), balls (12) and screens (14) made of a composition of elastomer or of plastic materials (15) and plate (16). The screens (14) are forced into grooves (13) of the external ring (10) and create a labyrinth seal with internal ring (11), while the lip (17) of the elastomer or plastic portion (15) creates a seal by pressing directly on the ring (11).
A plate (18) is assembled on the internal ring (11); this plate operates as a rotating centrifuge with the internal ring. The plate (18) is also supplied with a plastic or elastomer materials lining (19) from which a slipping lip extends on the bent length (21) of the plate (16).
The upper portion of the lining (19) creates a labyrinth seal (23) having a reduced port with the external ring (10) which is appointed for avoiding coarse particles (stones, sand, mud, vegetable fibers from entering) in contact with the seal lips (17 and 20).