Pneumatic tire
AssigneeThe Yokohama Rubber Co., Ltd.
InventorHideki Hamanaka
Life of this patent
Estimating the term…
Abstract
A pneumatic tire comprises a carcass layer, a belt layer radially outward of the carcass layer, and a tread rubber radially outward of the belt layer. The belt layer is formed by laminating a large angle belt having a belt-cord angle of 45°-70°, a pair of cross belts having belt cord angles of 10°-45° with opposite sign belt cord angles, and a reinforcing layer having a belt cord angle satisfying ±5° relative to a circumferential direction. A reinforcing layer width Ws and a carcass cross-sectional width Wca satisfy 0.60≤Ws/Wca≤0.70. A wider cross belt width Wb2 of the pair of cross belts and the carcass width Wca satisfy 0.79≤Wb2/Wca≤0.89. Relationships 0.79≤Wb2/Wca≤0.84 and either 0.82≤TW/Wca≤0.92 or 0.79≤TW/SW≤0.89 are satisfied, where TW is a tread width and SW is a total tire width.
Claims13
A pneumatic tire comprising a carcass layer, a belt layer disposed on an outer side of the carcass layer in a tire radial direction, and a tread rubber disposed on the outer side of the belt layer in the tire radial direction, wherein
- the belt layer is formed by laminating a large angle belt having a belt cord angle of not less than 45° and not more than 70° in absolute values, a pair of cross belts having belt cord angles of not less than 10° and not more than 45° in absolute values and having belt cord angles of mutually opposite signs, and a circumferential reinforcing layer having a belt cord angle within a range of ±5° with respect to a tire circumferential direction,
- the pair of cross belts are disposed on the outer side in the tire radial direction of the large angle belt,
- the circumferential reinforcing layer is disposed on the inner side in the tire radial direction of the pair of cross belts,
- a width Ws of the circumferential reinforcing layer and a cross-sectional width Wca of the carcass layer have a relationship such that 0.60≤Ws/Wca≤0.70;
- a width Wb2 of a wider cross belt of the pair of cross belts, and the cross-sectional width Wca of the carcass layer have a relationship such that 0.79≤Wb2/Wca≤0.84;
- a tread width TW and a cross-sectional width Wca of the carcass layer have a relationship such that 0.82≤TW/Wca≤0.92;
- and
- a diameter Ya of the highest position of the carcass layer and a diameter Yc of the widest position of the carcass layer have a relationship such that 0.80≤Yc/Ya≤0.90.
A pneumatic tire comprising a carcass layer, a belt layer disposed on an outer side of the carcass layer in a tire radial direction, and a tread rubber disposed on the outer side of the belt layer in the tire radial direction, wherein
- the belt layer is formed by laminating a large angle belt having a belt cord angle of not less than 45° and not more than 70° in absolute values, a pair of cross belts having belt cord angles of not less than 10° and not more than 45° in absolute values and having belt cord angles of mutually opposite signs, and a circumferential reinforcing layer having a belt cord angle within a range of ±5° with respect to a tire circumferential direction,
- the pair of cross belts are disposed on the outer side in the tire radial direction of the large angle belt,
- the circumferential reinforcing layer is disposed on the inner side in the tire radial direction of the pair of cross belts,
- a width Ws of the circumferential reinforcing layer and a cross-sectional width Wca of the carcass layer have a relationship such that 0.60≤Ws/Wca≤0.70;
- a width Wb2 of a wider cross belt of the pair of cross belts, and the cross-sectional width Wca of the carcass layer have a relationship such that 0.79≤Wb2/Wca≤0.84;
- a tread width TW and a total tire width SW have a relationship such that 0.79≤TW/SW≤0.89;
- and
- a diameter Ya of the highest position of the carcass layer and a diameter Yc of the widest position of the carcass layer have a relationship such that 0.80≤Yc/Ya≤0.90.
Dependencies are inferred from the claim text.