Solid anti-friction devices – materials therefor – lubricant or se – Solid anti-friction device – article or material therefor – Halogen compound
Patent
1997-07-18
1999-08-17
McAvoy, Ellen M.
Solid anti-friction devices, materials therefor, lubricant or se
Solid anti-friction device, article or material therefor
Halogen compound
508104, C10M10740, C10M10738
Patent
active
059393637
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a roller bearing and a process of forming lubricating film therefor. The roller bearing will prove its merits when used in a vacuum, a clean atmosphere, or a corrosive environment in which ordinary grease and oil cannot be used.
BACKGROUND ART
One of the above-mentioned special instances is the conveyor in the semiconductor fabricating system. Grease is not adequate beause it evaporates to deteriorate the lubricating performance and to contaminate the working environment. A common way of coping with this situation has been to coat the raceway surface of the bearing ring, the surf ace of the rolling element, and/or the surface of the cage pocket with soft metal (such as gold, silver, lead, and copper) or solid lubricant (such as carbon and molybdenum disulfide) in the form of film.
The coating film of solid lubricant has the disadvantage of gradually peeling off while the rolling element is rotating or sliding. Although the coating film evolves less dust than the grease, the resulting dust is detrimental to the clean working environment. In addition, the amount of dust increases under the high-load conditions.
The present inventors' experience in coating the bearing ring and cage with a solid lubricant of fluoroplastic containing a binder revealed that this solid lubricant evolves much less dust than the conventional one. Nevertheless, the coating film of this solid lubricant is still subject to peeling and dropping (evolving dust) under a comparatively large axial load. The result of peeling and dropping is the decreased lubricating function and the direct contact between metals, which leads to adhesion, wear, and short life. In addition, with the coating film peeled off or dropped, the bearing is subject to corrosion in a corrosive environment.
It is an object of the present invention to provide a means to reduce the evolution of dust from a rolling bearing, thereby improving its lubricating performance and prolonging its life.
DISCLOSURE OF THE INVENTION
roller bearing which is characterized in that at least one of its constituents is coated with a solid film formed from a fluorine-containing polyurethane.
Incidentally, the solid film should preferably be one which has the three-dimensional network structure. In addition, the solid film should preferably be incorporated with a mobile fluoropolymer dispersed therein. The mobile fluoropolymer should preferably be one which has no functional groups.
The second aspect of the present invention resides in a process of forming a lubricating film on a roller bearing.
The first embodiment of the process comprises the steps of dissolving in a solvent a fluoropolymer having isocyanate groups as functional groups, applying the solution to at least one of the constituents of a roller bearing, thereby forming a liquid film thereon, and curing the liquid film, thereby forming a solid film of fluorine-containing polyurethane of network structure.
The second embodiment of the process comprises the steps of dissolving in a solvent a mixture of a fluoropolymer having isocyanate groups as functional groups and a fluoropolymer having at least one kind of hydroxyl group, amino group, and carboxyl group, applying the solution to at least one of the constituents of a roller bearing, thereby forming a liquid film thereon, and curing the liquid film, thereby forming a solid film of fluorine-containing polyurethane of network structure.
The third embodiment of the process comprises the steps of dissolving in a solvent a fluoropolymer having isocyanate groups as functional groups alone or in combination with a fluoropolymer having at least one kind of hydroxyl group, amino group, and carboxyl group, adding the solution to a solution of a fluoropolymer having no functional groups, applying the solution to at least one of the constituents of a roller bearing, thereby forming a liquid film thereon, and curing the liquid film, thereby forming a solid film of fluorine-containing polyurethane of network structure in which the fluoro
REFERENCES:
patent: 3344064 (1967-09-01), Brady et al.
patent: 3652409 (1972-03-01), Mack et al.
patent: 4432883 (1984-02-01), Denzine et al.
Hayashida Kazunori
Takebayashi Hiroaki
Toyota Hiroshi
Koyo Seiko Co. Ltd.
McAvoy Ellen M.
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