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US 4,575,429 AGranted
Composite self lubricating bearings
AssigneeGarlock Bearings, Inc.
InventorCharles B. Jacobson
Life of this patent
Estimating the term…
Abstract
Improved composite bearings are provided employing cold forming and sintering techniques. Improvements in compositions for impregnating porous layers of composite bearings are provided comprising lead or lead alloy, perfluorinated polymer, particulate thermoplastic polymer and clay in particular proportions. When such materials are formed into bearings and subsequently sintered, improved resistance to stripping and wear is provided.
Claims19
A self lubricating, composite bearing having improved resistance to stripping and improved wear resistance comprising:
- a metal backing;
- a porous layer on the backing;
- a sintered lining on and impregnated into the porous layer, said lining formed from a blend comprising by weight:
- a major proportion of lead or a lubricating alloy of lead;
- a minor proportion of perfluorinated polymer selected from the group consisting of homopolymers and copolymers of polytetrafluoroethylene;
- from about 3 to about 15% of a particulate thermoplastic polymer having a mean particle size less than about 20 microns;
- and
- from about 1 to about 5% of clay;
- said thermoplastic polymer being selected to improve the adherence of the sintered lining to the porous layer, the thermoplastic polymer being substantially undegraded when sintered in the blend to form the lining.
6 more elements
A method of preparing a self-lubricating composite bearing comprising:
- providing a laminated underlayment having a porous layer;
- applying to the porour layer a lining formed from a blend comprising by weight:
- a major proportion of lead or a lubricating alloy of lead;
- a minor proportion of perfluorinated polymer selected from the group consisting of homopolymers and copolymers of polytetrafluoroethylene;
- from about 3 to about 15% of a particulate thermoplastic polymer having a mean particle size less than about 20 microns;
- and
- from about 1 to about 5% of clay;
- causing the blend to impregnate the porous layer;
- heating said lining for a time and at a temperature sufficient to sinter the lining but insufficient to cause substantial degradation of the thermoplastic polymer in the lining.
6 more elements
Dependencies are inferred from the claim text.