EP0715974A1
Expired / Lapsed
EP
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Triplex tread
Assignee: Goodyear Tire and Rubber Co
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Filing: 1995-10-30
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Granted: —
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Expires: 2015-10-30
Abstract
Abstract By providing a tread (16) that has increased wear properties as the tire (10) is worn, the pattern of irregular wear can be broken or minimized. The tire (10) of the invention comprises a tread (16) that has at least two layers (22,24,26) of rubber having different moduli, wherein the layer of rubber having the lower modulus is at the surface of the tread.
Inventors
- 👤 Jennifer Leigh Gabor
- 👤 Michael Brendan Rodgers
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 14:19
CPC Classifications
B; B60; B60C; B60C11/00; B60C11/14; B60C11/18; B60C9/00; B60C9/18; B60C1/00; B60C1/0016
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
71 words
A tread (16) for use on a pneumatic tire (10) characterized by comprising a plurality of radially disposed density zones (22-27) of rubbery material wherein each density zone has an axial width substantially equal to the axial width of said tread (16) , and wherein each density zone has physical properties of Shore A hardness, modulus, rebound elongation, wear properties and abrasion resistance, which are different from an adjacent density zone.
Claim 2
Dependent Claim
33 words
The tread (16) of claim 1 characterized by the radially outermost density zone (22) having the lowest abrasion resistance properties and the radially innermost density zone (27) having the highest abrasion resistance properties.
Claim 3
Dependent Claim
47 words
The tread (16) of claim 1 characterized by each of the plurality of density zones (22-27) having the same rubber formula except for the amount of reinforcing agent, such as silica or carbon black, wherein each zone contains incrementally more reinforcing agent than the zone radially above.
Claim 4
Dependent Claim
17 words
The tread (16) of any of claims 1-3 characterized by having from 2 to 6 density zones.
Claim 5
Dependent Claim
16 words
The tread (16) of claim 1 or 2 characterized by having three density zones (22,24,26) .
Claim 6
Dependent Claim
53 words
The tread (16) of claim 5 characterized by the radially outermost (first) density zone (22) comprising 10 to 80% of the tread thickness, the intermediate (second) density zone (24) comprising 10 to 80% of the tread thickness and the radially innermost (third) density zone (26) comprising 10 to 80% of the tread thickness.
Claim 7
Dependent Claim
51 words
The tread (16) of claim 5 characterized by the first density zone (22) comprising 15 to 60 % of the tread thickness, the second density zone (24) comprising 15 to 60 % of the tread thickness and the third density zone (26) comprising 15 to 60 % of the tread thickness.
Claim 8
Dependent Claim
60 words
The tread (16) of claim 5 characterized by the first density zone (22) having a tensile modulus at 300% elongation of 6 to 14 MPa; the second density zone (24) having a tensile modulus at 300% elongation of 10 to 16 MPa; and the third density zone (26) having a tensile modulus at 300% elongation of 12 to 18 MPa.
Claim 9
Dependent Claim
78 words
The tread (16) of claim 5 characterized by each of the zones (22,24,26) having the same rubber formula except for the amount of carbon black used as reinforcing agent, each zone containing incrementally more carbon black than the zone radially above, the first density zone (22) comprising 30 to 50 phr carbon black, the second density zone (24) comprising 40 to 60 phr carbon black, and the third density zone (26) comprising 50 to 70 phr carbon black.
Claim 10
Dependent Claim
81 words
The tread (16) of claim 5 characterized by each of the zones having the same rubber formula except for the kind of carbon black used as reinforcing agent, each zone containing an incrementally more stiff rubber than the zone radially above, the first density zone (22) comprising 30 to 60 phr HAF carbon black, the second density zone (24) comprising 30 to 60 phr ISAF carbon black, and the third density zone (26) comprising 30 to 60 phr SAF carbon black.
Claim 11
Dependent Claim
71 words
A pneumatic tire (10) comprising at least a pair of substantially parallel annular beads (12) , at least one carcass ply (14) wrapped around said beads, a tread (16) disposed over said at least one carcass ply (14) in a crown area of said tire (10) and sidewalls (18) disposed between said tread and said beads, characterized by said tread (16) being as claimed in any of claims 1 to 10.
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