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US 2016/0243897 A1Published application
Pneumatic tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorHiroaki KAJITA
Life of this patent
Estimating the term…
Abstract
In order to improve fuel economy while ensuring driving stability, a pneumatic tire is provided with one carcass ply, two belt plies, and one band ply, and satisfies the following: Wt≦−0.7257×(Db)2+42.763×Db−339.67 (1) Wt≧−0.7257×(Db)2+48.568×Db−552.33 (2) Dt≦59.078×Wt0.498 (3) Dt≧59.078×Wt0.467 (4) where Wt (unit: mm) is the tire cross section width, Db (unit: inches) is the bead diameter, and Dt (unit: mm) is the tire outer diameter, with a carcass cord being made of an aramid fiber cord.
Claims4
A pneumatic tire comprising:
- a carcass comprising one carcass ply comprising a ply main body portion extending between bead cores of bead portions through a tread portion and sidewall portions and a pair of ply turn-up portions each turned up around each bead core;
- a belt layer comprising two belt plies disposed radially outward of the carcass in the tread portion;
- a band layer comprising one band ply disposed radially outward of the belt layer;
- a tire section width Wt (unit:
- mm) in relation to a bead diameter Db (unit:
- inch) satisfying the following equations (1) and (2),
- Wt≦−0.7257×(Db)2+42.763×Db−339.67 (1);
- and
- Wt≧−0.7257×(Db)2+48.568×Db−552.33 (2);
- a tire outer diameter Dt (unit:
- mm) satisfying the following equations (3) and (4),
- Dt≦59.078×Wt0.498 (3),
- and
- Dt≧59.078×Wt0.467 (4);
- and
- a carcass cord of the carcass ply being made of an aramid fiber cord.
13 more elements
Dependencies are inferred from the claim text.