US 12,420,596 B2
Pneumatic tire
Koji Nishio, Kanagawa (JP)
Assigned to The Yokohama Rubber Co., LTD., Tokyo (JP)
Appl. No. 18/573,233
Filed by The Yokohama Rubber Co., Ltd., Kanagawa (JP)
PCT Filed Mar. 28, 2022, PCT No. PCT/JP2022/014789
§ 371(c)(1), (2) Date Dec. 21, 2023,
PCT Pub. No. WO2023/276367, PCT Pub. Date Jan. 5, 2023.
Claims priority of application No. 2021-108832 (JP), filed on Jun. 30, 2021.
Prior Publication US 2025/0074120 A1, Mar. 6, 2025
Int. Cl. B60C 15/06 (2006.01); B60C 15/00 (2006.01)
CPC B60C 15/0635 (2013.01) [B60C 15/0009 (2013.01); B60C 15/0653 (2013.01); B60C 2015/009 (2013.01); B60C 2015/0617 (2013.01); B60C 2015/0625 (2013.01); B60C 2015/066 (2013.01); B60C 2015/0664 (2013.01); B60C 2015/0667 (2013.01); B60C 2015/0685 (2013.01); B60C 2015/0692 (2013.01)] 18 Claims
OG exemplary drawing
 
1. 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°.