Bearings – Rotary bearing – Antifriction bearing
Reexamination Certificate
1999-09-09
2001-04-17
Footland, Lenard A. (Department: 3682)
Bearings
Rotary bearing
Antifriction bearing
C384S572000, C384S903000
Reexamination Certificate
active
06217224
ABSTRACT:
BRIEF DESCRIPTION OF THE INVENTION
The invention relates to a roller bearing, which on either the outer or inner ring thereof there is provided at least one roller retainer in the form of a plastic guide rim that is snapped into the applicable bearing ring.
In rolling bearings it is generally known to form the metal guide rim of metal manufactured separately from the bearing rings, which are placed in respective grooves in the bearing rings in order to fix and guide the rollers in the axial direction, i.e. in the direction of the roller axis.
From German Document No. 34 26 185-C2, in order to lower the coefficient of friction, it is known to provide a plastic ring, instead of a metal guide rim, snapped into the applicable bearing ring. These plastic rings are simple to make and are easy to assemble and disassemble. At high axial loads, however, they wear quickly. It is therefore also noted in Document 34 26 185-C2 that this bearing is suitable only for relatively low axial loads.
The object of the present invention is to exploit the simple manufacture and ease of assembly of the plastic rings and at the same time to make them more wear-resistant for use under relatively great axial forces.
SUMMARY OF THE INVENTION
According to the invention, this object is attained in that the end of the plastic guide rim facing the rollers is provided with a metal butting face.
Due to this metal butting face, which in a modified form of the invention can preferably be formed by a sheet-metal disk disposed in the end face of the guide rim, the wear between the rollers and the butting faces is substantially reduced.
This sheet-metal disk can be joined to the plastic ring in a known manner by adhesive bonding, potting, or the like. It is expedient, in a further characteristic of the invention, to insert this sheet-metal disk into a recess formed in the end face of the plastic guide rim.
The sheet-metal disk can be stamped from a band. In a modified form of the invention it is also possible to cut the sheet-metal disk from a helical band and to secure this cut-out portion, after being pressed flat, to the plastic ring.
To attain an easily assembled and yet sufficiently solidly seated embodiment, in a modified form of the invention, the plastic ring forming the guide rim has a conical, elastically resilient anchoring lip on its circumferential side facing toward the applicable bearing ring and pointing away from the rollers. The lip is adapted in shape to an annular groove with a sawtoothed profile formed in the applicable bearing ring. Upon insertion of the plastic ring into the bearing ring, the anchoring lip is initially compressed elastically and then relaxes in the annular groove or in other words snaps back to its original shape and functions as a barb. It is understood, however, that it would alternatively be possible to provide two or more annular grooves side by side in the applicable bearing ring and to provide annular beads, instead of the anchoring lip, on the snap-in plastic ring that have a cross section equivalent to the grooves.
The anchoring lip may be continuously annular in shape. However, in a modified form of the invention, it is also possible to provide the anchoring lip with slits distributed over its circumference, or in other words to divide the lip into individual segments, whereby the lip is discontinuously annular. This makes for simpler and easier assembly and disassembly—especially for relatively large bearings.
In a further modified form of the invention, the plastic ring forming the guide rim is provided with a sealing lip that protrudes toward the other (opposed) bearing ring, so that the plastic ring performs the dual function of a guide rim on the one hand and a sealing ring on the other; the sealing lip is intended to slide on the opposed bearing ring or to act as a gap seal. The sealing lip may be embodied in a known way.
REFERENCES:
patent: 5000588 (1991-03-01), Prinz
Burns Doane Swecker & Mathis L.L.P.
Footland Lenard A.
SKF GmbH
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