Patent US4575429A successfully refreshed from Google Patents.
US4575429A
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US
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Composite self lubricating bearings
Assignee: Garlock Bearings Inc
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Filing: 1984-12-04
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Granted: 1986-03-11
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Expires: 2004-12-04
Abstract
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.
Inventors
- 👤 Charles B. Jacobson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:00
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/20; F16C33/201; C; C10; C10M; C10M103/00; C10M103/04; C10M103/06; C10M107/00; C10M107/38; C10M107/46; C10M111/00; C10M111/04; F16C33/203; F16C33/206; C10M2201/00; C10M2201/04; C10M2201/05; C10M2201/053; C10M2201/06; C10M2201/0603; C10M2201/061; C10M2201/0613; C10M2201/062; C10M2201/0623; C10M2201/065; C10M2201/0653; C10M2201/066; C10M2201/0663; C10M2201/08; C10M2201/0803; C10M2201/085; C10M2201/0853; C10M2201/086; C10M2201/0863; C10M2201/087; C10M2201/0873; C10M2201/10; C10M2201/1006; C10M2201/102; C10M2201/1023; C10M2201/103; C10M2201/1033; C10M2201/105; C10M2201/1053; C10M2201/12; C10M2201/123; C10M2201/16; C10M2201/18; C10M2211/00; C10M2211/06; C10M2213/00; C10M2213/02; C10M2213/023; C10M2213/04; C10M2213/043; C10M2213/06; C10M2213/0606; C10M2213/062; C10M2213/0623; C10M2217/00; C10M2217/02; C10M2217/04; C10M2217/044; C10M2217/045; C10M2221/00; C10M2221/003; C10M2221/02; C10M2221/025; C10M2221/04; C10M2221/0405; C10N; C10N2010/00; C10N2010/08; C10N2040/00; C10N2040/02; F16C2208/00; F16C2208/20; F16C2208/52; F16C2240/00; F16C2240/40; F16C2240/48; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12007; Y10T428/12014; Y10T428/12028; Y10T428/12042; Y10T428/12049; Y10T428/12056
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
133 words
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.
Claim 2
Dependent Claim
133 words
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.
Claim 3
Dependent Claim
12 words
The bearing of claim 1 wherein the thermoplastic polymer comprises polyarylene sulfide.
Claim 4
Dependent Claim
13 words
The bearing of claim 1 wherein the particulate thermoplastic polymer comprises polyphenylene sulfide.
Claim 5
Dependent Claim
17 words
The bearing of claim 1 wherein the clay has a Mohs hardness of less than about 3.
Claim 6
Dependent Claim
10 words
The bearing of claim 1 wherein the clay comprises kaolin.
Claim 7
Dependent Claim
25 words
The bearing of claim 1 wherein the lead or lead alloy is present in a weight ratio to perfluorinated polymer between about 1.0 and 1.5.
Claim 8
Dependent Claim
18 words
The bearing of claim 1 wherein the clay has an average particle size less than about 20 microns.
Claim 9
Dependent Claim
38 words
The bearing of claim 1 wherein the lining has been sintered at a temperature and for a time sufficient to effect the sintering but which is insufficient to cause substantial degradation of the thermoplastic polymer in the lining.
Claim 10
Dependent Claim
18 words
The bearing of claim 8 wherein the sintering temperature is at least about 675° F. for 3 minutes.
Claim 11
Dependent Claim
12 words
A shock absorber or MacPherson strut including the bearing of claim 1.
Claim 12
Independent Claim
125 words
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.
Claim 13
Independent Claim
125 words
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.
Claim 14
Dependent Claim
13 words
The method of claim 11 wherein the particulate thermoplastic polymer comprises polyarylene sulfide.
Claim 15
Dependent Claim
13 words
The method of claim 11 wherein the particulate thermoplastic polymer comprises polyphenylene sulfide.
Claim 16
Dependent Claim
17 words
The method of claim 11 wherein the clay has a Mohs hardness of less than about 3.
Claim 17
Dependent Claim
10 words
The method of claim 11 wherein the clay comprises kaolin.
Claim 18
Dependent Claim
25 words
The method of claim 11 wherein the lead or lead alloy is present in a weight ratio to perfluorinated polymer between about 1.0 and 1.5.
Claim 19
Dependent Claim
18 words
The method of claim 11 wherein the clay has an average particle size less than about 20 microns.
Claim 20
Dependent Claim
18 words
The method of claim 11 wherein the sintering temperature is at least about 675° F. for three minutes.
Claim 21
Dependent Claim
11 words
A bearing produced in accordance with the method of claim 11.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-10 | 1989-09-09 | 1990-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-10 | 1993-09-09 | 1994-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-10 | 1997-09-09 | 1998-03-11 | $7700.00 | Window Closed / Lapsed |