Bearings – Rotary bearing – Antifriction bearing
Reexamination Certificate
1998-03-10
2001-05-08
Hannon, Thomas R. (Department: 3682)
Bearings
Rotary bearing
Antifriction bearing
C384S475000, C384S486000, C384S569000, C384S571000
Reexamination Certificate
active
06227713
ABSTRACT:
The present application claims priority under 35 U.S.C. § 119 with respect to German Application No. G 297 04 386.2, the entire content of which is incorporated herein by reference.
FIELD OF THE INVENTION
The present invention generally relates to a roller bearing. More particularly, the present invention pertains to four-row tapered roll bearing for working rolls of roll stands.
BACKGROUND OF THE INVENTION
A known type of four-row tapered roller bearing for working rolls of roll stands is disclosed in DE-OS 42 06 764, which corresponds to U.S. Pat. No. 5,362,159. This roller bearing is constructed of axially multi-part inner and outer rings, with tapered rollers provided between the bearing rings. A partition groove is provided between the end faces of the inner rings that face each other and are directly positioned against each other. The partition groove is sealed by a sealing ring which is provided in its bore with peripheral ribs resting on the mantle surfaces of the inner rings. Between the ribs and the area of the inner ring mantle surfaces located between the ribs is formed a chamber which bridges the partition groove and is designed to hold lubricant.
This known design is intended solely for a specific application under specific operating conditions, e.g. lubrication, which means that several different versions of the roller bearing must be manufactured and kept in stock for the various possible operating conditions. This entails significant costs. This known roller bearing also brings with it the risk that wear may occur between the inner ring halves that experience movement relative to each other. This results at least in part because the heat elimination from the bearing inside is also not always sufficient.
A need thus exists for a tapered roller bearing that can be used universally for different applications, and in particular for different types of lubrication, A need also exists for a tapered roller bearing that ensures low wear as well as good heat elimination.
SUMMARY OF THE INVENTION
In light of the foregoing, the present invention provides a four-row tapered roller bearing for working rolls of roll stands that includes a plurality of axially arranged inner ring parts forming an inner ring, a plurality of axially arranged outer ring parts forming an outer ring, and four annular rows of tapered rolls positioned between the inner and outer ring parts. Each inner ring part has an inside extension with the inside extensions possessing end faces that are directly positioned against one another along a partition groove. The end face of at least one of the inside extensions is provided with a plurality of spaced apart and radially extending grooves in which is received lubricant to lubricate said end faces of the inside extensions. An annular sealing ring encircles the outer surfaces of the inside extensions of the inner ring parts and have a pair of inwardly directed ribs which engage the outer surface of the inside extensions to form between the ribs and the outer surfaces of the inside extensions a closed chamber which bridges the partition groove.
With this construction, it is possible to use the tapered roller bearing according to the invention in a variety of different ways. It is possible to eliminate the heat generated in the bearing through the grooves in the end faces of the inner ring parts facing each other. The grooves may be used for the passage or additional collection of lubricants which can be used for lubricating the end faces of the inner ring parts which perform relative movements during operation. A suitable lubricating grease or an oil stored in a cushion of porous material, or a solid lubricant can be used as the lubricant.
The lubricant can also be located in the chamber formed by the sealing ring bridging the partition groove. The sealing ring prevents the abrasion generated by the relative movement between the inner ring parts relative to each other or to the roll pins, or other contaminations, from reaching the inside of the bearing. The sealing ring can also be provided with a valve that opens in the presence of overpressure inside the bearing so that during lubrication of the bearing with oil vapor or oil mist, the grooves can function as ventilation or pressure compensation bores. In this way, additional heating of the bearing is prevented. Also, lubricant which escapes during overpressure provides a lubricant film between the end faces of the inner ring parts positioned against each other and between the bore of the inner ring parts and the roll pin when the bearing is seated loosely on the roll pin, thus reducing wear.
According to another aspect of the invention, a four-row tapered roller bearing includes a pair of axially arranged inner ring parts which together define an inner ring, a plurality of axially arranged outer ring parts which together define an outer ring, and four annular rows of tapered rolls positioned between the inner and outer rings. The inner ring parts have end faces that are directly positioned against one another at a partition groove. The end face of at least one of the inner ring parts is provided with circumferentially spaced apart grooves. A seal contacts the outer surfaces of the inner ring parts to define a closed chamber which bridges the partition gap.
Another aspect of the present invention involves a tapered roller bearing defined by a plurality of axially arranged inner ring parts in which a partition groove between end faces of the inner ring parts that are positioned in facing relation to one another is sealed by a seal that together with outer surfaces of the inner ring parts defines a chamber. The end face of at least one of the inner ring parts is provided with a plurality of spaced apart grooves. A plurality of axially arranged outer ring parts are positioned radially outwardly of the inner ring parts, and several rows of tapered rollers are disposed between the inner ring parts and the outer ring parts.
REFERENCES:
patent: 4692040 (1987-09-01), Ebaugh et al.
patent: 4997294 (1991-03-01), Hillmann
patent: 5362159 (1994-11-01), Küfner et al.
patent: 5642946 (1997-07-01), Caillault et al.
patent: 42 06 764 (1993-09-01), None
patent: 2 262 785 (1993-06-01), None
patent: 2 264 757 (1993-09-01), None
Neder Gunter
Peuschel Thomas
Schultheiss Manfred
Schwappach Alfred
Burns Doane Swecker & Mathis L.L.P.
Hannon Thomas R.
SKF GmbH
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