US4656203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Friction materials and their manufacture
Assignee: Turner and Newall Ltd
•
Filing: 1985-03-04
•
Granted: 1987-04-07
•
Expires: 2005-03-04
Abstract
Abstract Low density friction products composed of non-asbestos reinforcing fibers embedded in a matrix of binder material, optionally including friction and wear modifiers, are described in which the actual density of the product is less than 72% of the theoretical density. Clutch facings of this density exhibit improved wear characteristics, lower inertia and increased burst strength.
Inventors
- 👤 Euan Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:41
CPC Classifications
F; F16; F16D; F16D69/00; F16D69/02; F16D69/025; F16D69/026
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
49 words
A non-asbestos dry-running clutch facing comprising reinforcing fibers embedded in a matrix of binder material, in which specific gravity of the facing is not greater than 1.4 and the actual density of the facing is at least 60% but less than 72% of the theoretical density of the facing.
Claim 2
Dependent Claim
49 words
A non-asbestos dry-running clutch facing comprising reinforcing fibers embedded in a matrix of binder material, in which specific gravity of the facing is not greater than 1.4 and the actual density of the facing is at least 60% but less than 72% of the theoretical density of the facing.
Claim 3
Dependent Claim
23 words
A clutch facing according to claim 1 in which the reinforcing fibers have lengths in the range of 1 mm to 10 mm.
Claim 4
Dependent Claim
23 words
A clutch facing according to claim 2 in which the reinforcing fibers have lengths in the range of 1 mm to 4 mm.
Claim 5
Dependent Claim
30 words
A clutch facing according to claim 1 in which the reinforcing fibers are selected from glass, mineral wool, alumino-silicate fibers, steel, cellulose, aromatic polyamides, polyacrylonitrile, polyvinyl alcohol and mixtures thereof.
Claim 6
Dependent Claim
27 words
A clutch facing according to claim 4 in which the amount of reinforcing fibers is in the range of 20 to 30 percent by volume total solids.
Claim 7
Dependent Claim
17 words
A clutch facing according to claim 1 in which the binder material comprises a temperature-resistant thermosetting resin.
Claim 8
Dependent Claim
16 words
A clutch facing according to claim 6 in which the binder material is a phenolic resin.
Claim 9
Dependent Claim
27 words
A clutch facing according to claim 5 in which the amount of binder material is in the range of 20 to 75 percent by volume total solids.
Claim 10
Dependent Claim
27 words
A clutch facing according to claim 8 in which the amount of binder material is in the range of 35 to 45 percent by volume total solids.
Claim 11
Dependent Claim
18 words
A clutch facing according to claim 1 further including at least one friction modifier, wear modifier or filler.
Claim 12
Dependent Claim
31 words
A clutch facing according to claim 10 in which the friction modifier, wear modifier or filler is present in an amount of from 20 to 30 percent by volume total solids.
Claim 13
Independent Claim
105 words
A method for manufacturing a non-asbestos dry running clutch facing which comprises the steps of: (1) mixing together reinforcing fibers and curable binder material and, optionally, friction and wear modifiers; (2) forming the mixture of step (1) into a preform in the approximate shape of a clutch facing; (3) heating and pressing the preform to compress it without completely curing the binder material and consolidate the preform to an actual density is at least 60% but less than 72% of the theoretical density; and thereafter (4) completely curing the binder under conditions of pressure such as to avoid any substantial further change in actual density.
Claim 14
Independent Claim
105 words
A method for manufacturing a non-asbestos dry running clutch facing which comprises the steps of: (1) mixing together reinforcing fibers and curable binder material and, optionally, friction and wear modifiers; (2) forming the mixture of step (1) into a preform in the approximate shape of a clutch facing; (3) heating and pressing the preform to compress it without completely curing the binder material and consolidate the preform to an actual density is at least 60% but less than 72% of the theoretical density; and thereafter (4) completely curing the binder under conditions of pressure such as to avoid any substantial further change in actual density.
Claim 15
Dependent Claim
67 words
A method according to claim 12 in which the reinforcing fibers comprise fibers which are capable of forming a web when deposited from slurry, and in which the fibers and other materials are mixed together to form a slurry and forming said preform by deposition of the mixture from said slurry, the preform being subsequently dewatered and dried to a water content of below 1% by weight.
Claim 16
Dependent Claim
22 words
A method according to claim 12 in which the reinforcing fibers have lengths in the range of 1 mm to 10 mm.
Claim 17
Dependent Claim
22 words
A method according to claim 14 in which the reinforcing fibers have lengths in the range of 1 mm to 4 mm.
Claim 18
Dependent Claim
29 words
A method according to claim 12 in which the reinforcing fibers are selected from glass, mineral wool, alumino-silicate fibers, steel, cellulose, aromatic polyamides, polyacrylonitrile, polyvinyl alcohol and mixtures thereof.
Claim 19
Dependent Claim
26 words
A method according to claim 16 in which the amount of reinforcing fibers is in the range of 20 to 30 percent by volume total solids.
Claim 20
Dependent Claim
16 words
A method according to claim 17 in which the binder material comprises a temperature-resistant thermosetting resin.
Claim 21
Dependent Claim
15 words
A method according to claim 18 in which the binder material is a phenolic resin.
Claim 22
Dependent Claim
26 words
A method according to claim 12 in which the amount of binder material is in the range of 20 to 75 percent by volume total solids.
Claim 23
Dependent Claim
26 words
A method according to claim 20 in which the amount of binder material is in the range of 35 to 45 percent by volume total solids.
Claim 24
Dependent Claim
17 words
A method according to claim 12 further including at least one friction modifier, wear modifier or filler.
Claim 25
Dependent Claim
30 words
A method according to claim 22 in which the friction modifier, wear modifier or filler is present in an amount of from 20 to 30 percent by volume total solids.
References Cited (Backward Citations)
GB1008801A
Cited
US4118528A
Cited
US4349595A
Cited
US4374059A
Cited
US4403047A
Cited
US4386168A
Cited
US4374211A
Cited
US4465796A
Cited
US4477605A
Cited
US4476256A
Cited
US4508855A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-06 | 1990-10-06 | 1991-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-06 | 1994-10-06 | 1995-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-06 | 1998-10-06 | 1999-04-07 | $7700.00 | Window Closed / Lapsed |