Solid anti-friction devices – materials therefor – lubricant or se – Solid anti-friction device – article or material therefor – Halogen compound
Reexamination Certificate
2000-05-16
2001-01-30
McAvoy, Ellen M. (Department: 1764)
Solid anti-friction devices, materials therefor, lubricant or se
Solid anti-friction device, article or material therefor
Halogen compound
C106S287240, C106S287280, C427S372200, C427S384000, C427S388100, C427S393600
Reexamination Certificate
active
06180574
ABSTRACT:
FIELD OF INVENTION
This invention relates to self-lubricating coatings, and particularly to self-lubricating coatings useful for bearings.
BACKGROUND
Bearings having a self-lubricating coating are known. For example, U.S. Pat. No. 4,134,842 to Orkin discloses a self-lubricating bearing assembly in which one bearing surface is a woven fabric impregnated with a cured acrylate composition. The use of a woven fabric may not be suitable or convenient in some bearing applications, for example, where only a small orifice may be available into which to inject a coating.
In addition, customers demand bearing coatings with good wear properties. Under high temperature conditions, bearings typically wear more quickly. Therefore, a particularly desirable bearing coating would be easy to apply to a variety of surface and would have good wear properties even under high temperature use.
SUMMARY OF INVENTION
The present invention is directed to coatings with lubricating properties which may be applied by a variety of methods to surfaces of various configurations to provide a law friction surface. The coatings of the invention are useful as self-lubricating coatings for bearings and the like. Bearings coated with coatings described herein have been found to have good wear performance even under high pressure and high temperature conditions required for qualification to military specifications. Such test conditions are more stringent than required for most applications, and are therefore a desirable benchmark to measure wear performance. The coating may also permit easier bearing maintenance. A roller bearing with the coating applied to the inside diameter of the inner race may be capable of being removed from a shaft during maintenance, rather than being cut from the shaft and thereby destroyed.
One aspect of the present invention is a coating comprising a mixture of a curable acrylate composition including a dipentaerythritol pentaacrylate; and a solid lubricant. The solid lubricant is preferably a polytetrafluoroethylene. The curable acrylate composition may further include another acrylate. Representative acrylates include triethylene glycol dimethacrylate, epoxy novolac acrylate, pentaerythritol tetraacrylate, diethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, dipropylene glycol dimethacrylate, tetraethylene glycol diacrylate, pentaerythritol tetramethacrylate, and dipentaerythritol hexaacrylate; with triethylene glycol dimethacrylate being most preferred.
Another aspect of the invention is a method of manufacturing the coating. The method involves admixing a curable acrylate including a dipentaerythritol pentaacrylate, and at least about 10 weight percent of a solid lubricant, based on the weight of the mixture.
Another aspect of the invention is a self-lubricating bearing comprising a bearing surface having the coating disposed thereon. The self-lubricating bearing may be manufactured by applying the coating described above to a bearing; and curing th coating to form a rigid composite.
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Karon Bearing and Coatings Brochure of Kamatics Corporation (date N/A).
Allaway Julia B.
Fehrenbach Janice N.
Hubiak William R.
Ryan William E.
Strause James M.
McAvoy Ellen M.
Quarles & Brady LLP
Rexnord Corporation
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