Pneumatic tire
AssigneeThe Yokohama Rubber Co., Ltd.
InventorKoji Nishio
Life of this patent
Estimating the term…
Abstract
Provided is a pneumatic tire in which fiber reinforced layers on an outer side of a steel reinforced layer in a width direction each include fiber cords arranged in one direction, the fiber cords being oriented to cross each other between layers, a radially outer end of one of the fiber reinforced layers being radially outward of a turned-up end portion of a carcass layer, a radially outer end portion of another one of the fiber reinforced layers being radially inward of the turned-up end portion and radially outward of a line segment (K). Radially inner end portions of the fiber reinforced layers are inward in the width direction of a line segment (J), and cord angles θA and θB of the fiber reinforced layers satisfy 20°≤|θA|≤45° or 70°≤|θA|≤90°, and 20°≤|θB|≤45° or 70°≤|θB|≤90°.
Claims18
A pneumatic tire, comprising:
- a tread portion extending in a tire circumferential direction and having an annular shape;
- a pair of sidewall portions disposed on both sides of the tread portion;
- and,
- a pair of bead portions disposed on inner sides of the sidewall portions in a tire radial direction, a carcass layer being mounted between the pair of bead portions, the carcass layer being turned up around a bead core of each of the bead portions from a tire inner side to a tire outer side, and a steel reinforced layer comprising a plurality of steel cords being disposed in each of the bead portions so as to wrap the carcass layer, first and second organic fiber reinforced layers being disposed on an outer side of the steel reinforced layer in a tire width direction, each of the first and second organic fiber reinforced layers comprising a plurality of organic fiber cords arranged in one direction, and the organic fiber cords constituting the first and second organic fiber reinforced layers being oriented so as to cross each other between layers, a radially outer end portion of the first organic fiber reinforced layer being positioned more on an outer side in the tire radial direction than a turned-up end portion of the carcass layer, and a radially outer end portion of the second organic fiber reinforced layer being positioned more on an inner side in the tire radial direction than the turned-up end portion of the carcass layer and more on the outer side in the tire radial direction than a line segment formed by a horizontal line drawn in the tire width direction from an apex of the bead core protruding farthest to the outer side in the tire radial direction, radially inner end portions of the first and second organic fiber reinforced layers being both positioned more on an inner side in the tire width direction than a line segment formed by a normal line drawn from an apex of the bead core protruding farthest to the inner side in the tire radial direction to a surface of a bead base, and a cord angle θA of the first organic fiber reinforced layer with respect to the tire circumferential direction being in a range 20°≤|0A|≤45° or 70°≤|θA|≤90°, and a cord angle θB of the second organic fiber reinforced layer with respect to the tire circumferential direction being in a range 20°≤|θB|≤45° or 70°≤|θB|≤90°.
Dependencies are inferred from the claim text.