US3781067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Belt track structure
Assignee: Goodyear Tire and Rubber Co
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Filing: 1972-09-21
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Granted: 1973-12-25
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Expires: 1992-09-21
Abstract
Abstract A belt track for a track-driven vehicle and a method of making the belt track. The belt track has an inner surface adapted for moving contact with rigid elements of the vehicle drive apparatus and the belt track supporting system. The inner surface of the belt track includes at least one surface portion comprised of a vulcanized rubbery composition of a polybutadiene polymer. Other different rubbery polymers such as styrene/butadiene or nitrile rubber may also be used in combination with the polybutadiene polymer. The surface portions provide a low friction, wear resistant surface which is resistant to temperature extremes. The belt track is particularly useful in conjunction with vehicle slider suspension systems and with driving systems in which a driving sprocket comes into moving contact with driving teeth or lugs formed on the inner surface of the belt track.
Inventors
- 👤 F Masters
- 👤 M Dodson
- 👤 R Marsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:30
CPC Classifications
B; B62; B62D; B62D55/00; B62D55/06; B62D55/07; B62D55/08; B62D55/18; B62D55/24; B62D55/244; B62M; B62M27/00; B62M27/02; B62M2027/027
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
31 words
The belt track as claimed in claim 1 wherein said inner surface is generally planar and said surface portion includes at least substantially the entire inner surface of said belt track.
Claim 2
Dependent Claim
23 words
The belt track as claimed in claim 1 wherein said surface portion comprises at least one strip extending longitudinally of said inner surface.
Claim 3
Dependent Claim
52 words
The belt track as claimed in claim 1 wherein said vulcanized rubbery composition is comprised of from about 45 to about 65 parts of said polybutadiene polymer and from about 35 to about 55 parts of said different rubbery polymer, said parts being by weight per 100 parts of (A) plus (B).
Claim 4
Dependent Claim
130 words
The method of making the flexible endless belt track of claim 1 comprising (A) combining (1) from about 25 to about 100 parts of at least one polybutadiene polymer having a total 1,4 content of from about 80 percent to 100 percent, a cis 1,4 content of at least 10 percent and a combined cis 1,4 plus 1,2 content of at least 30 percent and (2) from about 0 to about 75 parts of another different rubbery polymer to provide a rubbery vulcanizable composition, said parts being by weight per 100 parts of (1) plus (2); (B) forming said composition into at least one said surface portion of the inner surface of an unvulcanized belt, and (C) vulcanizing said endless belt to form a belt track for a track-driven vehicle.
Claim 5
Dependent Claim
27 words
The belt track as claimed in claim 1 wherein said surface portion comprises a plurality of driving lugs formed as an integral part of said inner surface.
Claim 6
Dependent Claim
29 words
The belt track as claimed in claim 6 wherein said surface portion comprises both said driving lugs and at least substantially the entire inner surface of said belt track.
Claim 7
Dependent Claim
34 words
The belt track as claimed in claim 1 wherein the cis 1,4 content of said polybutadiene is at least 30 percent and the combined cis 1,4 plus 1,2 content is at least 50 percent.
Claim 8
Dependent Claim
18 words
The belt track as claimed in claim 8 wherein said cis 1,4 content is at least 85 percent.
Claim 9
Dependent Claim
42 words
The belt track as claimed in claim 1 wherein said different rubbery polymer is at least one rubbery polymer selected from the group consisting of a copolymer of butadiene and styrene, a copolymer of butadiene and acrylonitrile and an ethylene propylene terpolymer.
Claim 10
Dependent Claim
19 words
The belt as claimed in claim 10 wherein said different rubbery polymer is a copolymer of butadiene and styrene.
Claim 11
Dependent Claim
20 words
The belt track as claimed in claim 10 wherein said different rubbery polymer is a copolymer of butadiene and acrylonitrile.
Claim 12
Dependent Claim
176 words
In an endless belt track for a snow traveling vehicle or the like, said belt having a ground-engaging cover including traction means to provide traction in the snow and an opposite vehicle-engaging cover which is in direct sliding frictional contact with rigid elements of the vehicle drive system and belt track supporting system, the improvement wherein said vehicle-engaging cover includes at least one flexible, low friction, abrasion-resistant surface layer of elastomeric material comprised of at least one vulcanized rubbery composition, said rubbery composition comprised of (A) from about 25 to about 100 parts of at least one polybutadiene polymer having a total 1,4 content of from about 80 percent to 100 percent, a cis 1,4 content of at least 10 percent and a combined cis 1,4 and 1,2 content of at least 30 percent and (B) from about 0 to about 75 parts of another different rubbery polymer, said parts being by weight per 100 parts of (A) plus (B), said surface layer being adapted to come into direct sliding frictional contact with said rigid elements.
Claim 13
Dependent Claim
178 words
In a track driven vehIcle comprising the combination of vehicle driving means, belt track supporting means and a flexible endless belt track having an outer ground-contacting surface and an opposite inner surface, the driving and track supporting means engaging the inner surface of the belt, the improvement wherein said inner surface includes at least one surface portion of elastomeric material contacting at least one of said means, said surface portion comprised of at least one vulcanized rubbery composition, said rubbery composition comprised of (A) from about 25 to about 100 parts of at least one polybutadiene polymer having a total 1,4 content of from about 80 percent to 100 percent, a cis 1,4 content of at least 10 percent and a combined cis 1,4 plus 1,2 content of at least 30 percent and (B) from about 0 to about 75 parts of another different rubbery polymer, said parts being by weight per 100 parts of (A) plus (B), said surface portion being adapted to come into direct contact with rigid elements of at least one of said means.
Claim 14
Dependent Claim
80 words
The improvement as claimed in claim 14 incorporated in a track-driven vehicle wherein said driving means comprises spaced wheels, at least one of which being a sprocket wheel, around which the belt is trained, said supporting means is a plurality of bogies disposed along the length of the belt and said surface portion comprises a plurality of driving lugs formed as an integral part of said inner surface and said driving lugs are in direct engagement with said sprocket wheel.
Claim 15
Dependent Claim
38 words
The improvement as claimed in claim 14 wherein said surface portion comprises a plurality of driving lugs formed as an integral part of said inner surface and said driving lugs are in direct engagement with said driving means.
Claim 16
Dependent Claim
85 words
The improvement as claimed in claim 14 incorporated in a track-driven vehicle wherein said driving means comprises spaced wheels at least one of which is a sprocket wheel around which the belt is trained, said supporting means comprises sliding means extending longitudinally of the vehicle and said inner surface is generally planar with said surface portion including at least substantially the entire inner surface of said belt track so that said surface portion is in direct contact with the sprocket wheel and the sliding means.
Claim 17
Dependent Claim
51 words
The improvement as claimed in claim 14 wherein said surface portion comprises both said driving lugs and at least substantially the entire inner surface of said belt track with said driving lugs being in direct engagement with said sprocket wheel and the inner surface in direct engagement with said sliding means.
Claim 18
Dependent Claim
34 words
The improvement as claimed in claim 17 wherein said belt track includes at least one row of openings therein and said sprocket wheel includes a plurality of teeth adapted to mesh with the openings.
Claim 19
Dependent Claim
50 words
The improvement as claimed in claim 17 wherein said sliding means is one or more elongated metal members and said surface portion comprises one or more strips extending longitudinally of the belt and in substantial alignment with said metal members so that a direct frictional sliding contact is maintained therebetween.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |