Solid anti-friction devices – materials therefor – lubricant or se – Solid anti-friction device – article or material therefor – Halogen compound
Patent
1998-08-11
2000-09-19
Medley, Margaret
Solid anti-friction devices, materials therefor, lubricant or se
Solid anti-friction device, article or material therefor
Halogen compound
508181, C10M14702, C10M14704
Patent
active
061212083
DESCRIPTION:
BRIEF SUMMARY
This application is the national phase under 35 U.S.C. .sctn.371 of prior PCT International Application No. PCT/JP97/01374 which has an International filing date of Apr. 22, 1997 which designated the United States of America, the entire contents of which are hereby incorporated by reference.
TECHNICAL FIELD
The present invention relates to a rolling sliding part which is in relative rolling contact or sliding contact with a companion member. As this rolling sliding part, for example, structural elements such as a rolling bearing, a ball screw and a direct-acting bearing are mentioned.
TECHNICAL BACKGROUND
A contact surface of a rolling sliding part has been so far coated with soft metals such as gold, silver, lead and copper or solid lubricants such as carbon and molybdenum disulfide in the form of a film. It has been, however, considered that in this film, dust is generated in a large amount and a loading resistance is low. Meanwhile, a film formed of a polytetrafluoroethylene (hereinafter abbreviated as "PTFE") resin has been used which generates little dust and exhibits a high loading resistance. This film is formed in a solid state. Further, the present applicant has proposed a lubricating film which is formed of a fluorine-containing polymer with a functional group and which is superior to the above-mentioned film with respect to dust generation and a lubricating property. This lubricating film can be rendered in a state of a flowable liquid or in a solid state of a high molecular weight. It is, however, indicated that when such a lubricating film is rendered in a solid state, it is softer than the above-mentioned PTFE, decreasing a loading resistance. When this film is rendered in a liquid state, it has a better loading resistance than the solid film, but this loading resistance is a bit inferior to that of the above-mentioned PTFE.
Accordingly, the present invention aims to improve especially a loading resistance of a contact surface of a rolling sliding part.
DISCLOSURE OF THE INVENTION
The first rolling sliding part of the present invention is in relative rolling contact or sliding contact with a companion member, and is formed on a contact surface thereof with a lubricating film composed of a polymer which contains fluorine with a functional group and in which particles of a polytetrafluoroethylene resin are dispersed and mixed.
The second rolling sliding part of the present invention is in relative rolling contact or sliding contact with a companion member, and is formed on a contact surface thereof with a solid lubricating film composed of a polyurethane high-molecular compound which contains fluorine and in which particles of a polytetrafluoroethylene resin are dispersed and mixed.
The above-mentioned solid lubricating film has a three-dimensional network structure in which molecules are urethane-linked. Further, in the solid lubricating film, a flowable fluorine-containing polymer is dispersed. Although this flowable fluorine-containing polymer is free from a functional group, it is preferably a fluorine-containing polymer such as a functional group-free perfluoropolyether. Still further, the above-mentioned particles are spherical. In this case, the lubricating film is preferably set to have a film thickness which is approximate to the maximum particle diameter of spherical particles.
In the present invention, since particles composed of a polytetrafluoroethylene resin are excellent in not only a lubricating property but also a loading resistance, an ability of the overall lubricating film that withstands a load is increased.
Further, when the lubricating film is a solid one composed of a fluorine-containing polyurethane high-molecular compound, it has a homogeneous structure in which molecules are closely linked, making it possible to continue a lubricating action for a long period of time. Besides, when the fluorine-containing polymer is dispersed in this solid lubricating film in a flowable state, the flowable fluorine-containing polymer flows from the surface of the film, contri
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patent: 5571779 (1996-11-01), Kleiner
patent: 5939363 (1999-08-01), Toyota et al.
Koyo Seiko Co. Ltd.
Medley Margaret
Toomer Cephia D.
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