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US3703224A
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Friction mechanisms containing silicon nitride
Assignee: Dunlop Co Ltd
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Filing: 1970-02-27
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Granted: 1972-11-21
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Expires: 1990-02-27
Abstract
Abstract A friction mechanism comprising an assembly of two relatively rotatable friction members, wherein the engaging surfaces of both friction members are provided with a sintered friction material, at least one of the friction members containing silicon nitride as a constituent. The friction material may also contain graphite and other friction and wear modifying agents such as molybdenum disulphide tin and lead, of which the following is a specification.
Inventors
- 👤 Horace A Bray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:28
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/02; F16D65/12; F16D65/122; F16D55/00; F16D55/24; F16D55/26; F16D55/36; F16D55/40; F16D69/00; F16D69/02; F16D69/027; F16D2055/0004; F16D2055/0058; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12139; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12951; Y10T428/12958; Y10T428/12965
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
77 words
A friction mechanism comprising an assembly of two relatively rotatable friction members having confronting engageable surfaces and wherein the engaging surfaces of both friction members are each provided with a sintered friction material containing silicon nitride as a constituent to provide a cumulative increase in coefficient of friction of not less than 10 per cent as compared with friction members having a combination of silicon nitride and steel as the confronting engageable surfaces of the friction members.
Claim 2
Dependent Claim
77 words
A friction mechanism comprising an assembly of two relatively rotatable friction members having confronting engageable surfaces and wherein the engaging surfaces of both friction members are each provided with a sintered friction material containing silicon nitride as a constituent to provide a cumulative increase in coefficient of friction of not less than 10 per cent as compared with friction members having a combination of silicon nitride and steel as the confronting engageable surfaces of the friction members.
Claim 3
Dependent Claim
48 words
A friction mechanism according to claim 1 wherein the composition by weight of the friction material containing silicon nitride comprises 0.5 percent silicon nitride, 5 to 10 percent graphite and 0 to 5 percent of other friction and wear modifying agents, the remainder of the material being iron.
Claim 4
Dependent Claim
41 words
A friction mechanism according to claim 1 wherein the composition by weight of the friction material containing silicon nitride comprises 2.5 percent silicon nitride, 8 percent graphite, 1 percent lead, 1 percent molybdenum disulphide, 2.5 percent tin and 85 percent iron.
Claim 5
Dependent Claim
29 words
A friction mechanism according to claim 1 wherein the friction members contain silicon nitride in the amount of 0.5 to about 70 percent by weight of the friction material.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |