US6068931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-lubricating bearing material and plain bearing of such a bearing material
Assignee: Federal Mogul Wiesbaden GmbH
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Filing: 1996-02-14
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Granted: 2000-05-30
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Expires: 2016-02-14
Abstract
Abstract A self-lubricating bearing material is described, as well as a plain bearing of such a bearing material, the performance of which, under lubricant-free conditions, is so markedly improved that pv values of up to 6 MPa/m/s are achieved in an average load and speed range. The self-lubricating bearing material comprises a PTFE-containing polymer matrix with fillers comprising PbO and at least one metal fluoride. The PbO content is from 15-55 vol. % and the metal fluoride content is from 0.1-14 vol. %. Preferred metal fluorides are CaF 2 , PbF 2 and MgF 2 . The addition of further fillers such as hard materials, pigments or fibrous material is possible. The proportion of further additives may amount to up to 40 vol. % of the PbO/metal fluoride fillers.
Inventors
- 👤 Achim Adam
- 👤 Karl-Heinz Grunthaler
- 👤 Erich Hodes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:09
CPC Classifications
C; C08; C08K; C08K3/00; F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/20; F16C33/201; C08K3/16; C08K3/18; C08K3/20; C08K3/22; F16C33/203; F16C33/205; F16C2208/00; F16C2208/02; F16C2208/20; F16C2208/30; F16C2208/32; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12583; Y10T428/12611; Y10T428/12701; Y10T428/12771; Y10T428/12861; Y10T428/12903; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T428/31678
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
41 words
A self-lubricating bearing material of a PTFE-containing polymer matrix with fillers comprising PbO and calcium fluoride, wherein the PbO content amounts to from 15 to 55 vol. % and the calcium fluoride content amounts to from 0.1 to 14 vol. %.
Claim 2
Dependent Claim
41 words
A self-lubricating bearing material of a PTFE-containing polymer matrix with fillers comprising PbO and calcium fluoride, wherein the PbO content amounts to from 15 to 55 vol. % and the calcium fluoride content amounts to from 0.1 to 14 vol. %.
Claim 3
Dependent Claim
30 words
A bearing material as claimed in claim 1, wherein, in addition to PTFE, the polymer matrix also comprises PEEK, PPS, PA, PVDF, PSU, PES or PEI individually or in combination.
Claim 4
Dependent Claim
36 words
A bearing material as claimed in claim 1, wherein the polymer matrix consists of PTFE and the fillers consist of from 15 to 55 vol. % PbO and 0.1 to 14 vol. % CaF 2 .
Claim 5
Dependent Claim
36 words
A bearing material as claimed in claim 3, wherein the polymer matrix consists of PTFE and the fillers consist of from 20 to 40 vol. % PbO and 0.3 to 8 vol. % CaF 2 .
Claim 6
Dependent Claim
26 words
A bearing material as claimed in claim 1, wherein the fillers include hard materials, pigments, fibrous materials, solid lubricants or thermoset or high temperature thermoplastic materials.
Claim 7
Dependent Claim
18 words
A bearing material as claimed in claim 5, wherein the hard materials are Si 3 N 4 .
Claim 8
Dependent Claim
19 words
A bearing material as claimed in claim 5, wherein the pigments are Fe 2 O 3 or carbon black.
Claim 9
Dependent Claim
19 words
A bearing material as claimed in claim 5, wherein the fibrous material is short graphite fibers or aramid fibers.
Claim 10
Dependent Claim
18 words
A bearing material as claimed in claim 5, wherein the solid lubricants are MoS 2 or boron nitride.
Claim 11
Dependent Claim
21 words
A bearing material as claimed in claim 5, wherein the thermoset or high temperature thermoplastic materials are polyamide imides or polyimides.
Claim 12
Dependent Claim
38 words
A plain bearing with a self-lubricating plastic overlay, wherein the plastic overlay is metallic-lead free and comprises PTFE-containing polymer matrix and from 15 to 55 vol. % PbO and 0.1 to 14 vol. % calcium fluoride as fillers.
Claim 13
Dependent Claim
38 words
A plain bearing with a self-lubricating plastic overlay, wherein the plastic overlay is metallic-lead free and comprises PTFE-containing polymer matrix and from 15 to 55 vol. % PbO and 0.1 to 14 vol. % calcium fluoride as fillers.
Claim 14
Dependent Claim
18 words
A plain bearing as claimed in claim 11, wherein the overlay is applied directly to a metal backing.
Claim 15
Dependent Claim
25 words
A plain bearing as claimed in claim 11, wherein the overlay is applied to a metal backing provided with a layer of porous sintered bronze.
Claim 16
Dependent Claim
21 words
A plain bearing as claimed in claim 13, wherein the sintered bronze has a pore volume of from 20 to 45%.
Claim 17
Dependent Claim
18 words
A plain bearing as claimed in claim 13, wherein the sintered bronze comprises from 5 to 15% tin.
Claim 18
Dependent Claim
24 words
A plain bearing as claimed in claim 13, wherein the sintered bronze comprises from 5 to 15% tin and from 5 to 15% lead.
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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) | 2003-05-30 | 2003-11-29 | 2004-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-05-30 | 2007-11-29 | 2008-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-05-30 | 2011-11-29 | 2012-05-30 | $7700.00 | Window Closed / Lapsed |