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US 7,156,138 B2Granted
Pneumatic tire with belt ply having composite topping rubber layer
AssigneeSumitomo Rubber Industries, Ltd.
InventorKazuya Suzuki
Life of this patent
Estimating the term…
Abstract
A pneumatic tire includes a carcass extending between bead portions through a tread portion and sidewall portions and a belt disposed radially outside the carcass in the tread portion, the belt constituting at least one belt ply made of parallel cords embedded in a composite topping rubber layer, the composite topping rubber layer formed from at least two kinds of topping rubbers having different complex elastic moduli, and the topping rubbers alternately disposed in a a circumferential direction of the tire.
Claims13
A pneumatic tire comprising:
- a carcass extending between bead portions through a tread portion and sidewall portions;
- and
- a belt disposed radially outside the carcass in the tread portion, said belt comprising at least one belt ply made of parallel cords embedded in a composite topping rubber layer,
- the cords of the belt ply being inclined at an angle of from 10 to 35 degrees with respect to the tire equator,
- said composite topping rubber layer formed at least two kinds of topping rubbers including a first topping portion made of a first topping rubber and
- a second topping portion made of a second topping rubber having greater complex elastic modulus than that of the first topping rubber,
- each of the first topping portion and the second topping portion being formed substantially into a parallelogram having a pair of parallel sides extending along the cords and a pair of parallel edges each forming a part of the axially outer edge of the belt ply, and said first and second topping rubbers alternately disposed in a circumferential direction of the tire.
4 more elements
A pneumatic tire comprising:
- a carcass extending between bead portions through a tread portion and sidewall portions;
- and
- a belt disposed radially outside the carcass in the tread portion, said belt comprising at least one belt ply made of parallel cords embedded in a composite topping rubber layer,
- the cords of the belt ply being inclined at an angle of from 10 to 35 degrees with respect to the tire equator,
- said composite topping rubber layer formed at least two kinds of topping rubbers including a first topping portion made of a first topping rubber and
- a second topping portion made of a second topping rubber having greater complex elastic modulus than that of the first topping rubber,
- said first and second topping rubbers alternately disposed in a circumferential direction of the tire, and
- a ratio (E*2/E*1) of complex elastic modulus E*1 of the first topping rubber and complex elastic modulus E*2 of the second topping rubber being from 1.15 to 1.50.
5 more elements
Dependencies are inferred from the claim text.