US 12,214,627 B2
Pneumatic tire
Takashi Hoshiba, Kanagawa (JP); Tatsuro Shinzawa, Kanagawa (JP); and Atsuhito Nakano, Kanagawa (JP)
Assigned to The Yokohama Rubber Co., LTD., Tokyo (JP)
Appl. No. 17/276,395
Filed by The Yokohama Rubber Co., LTD., Tokyo (JP)
PCT Filed Sep. 11, 2019, PCT No. PCT/JP2019/035669
§ 371(c)(1), (2) Date Mar. 15, 2021,
PCT Pub. No. WO2020/059589, PCT Pub. Date Mar. 26, 2020.
Claims priority of application No. 2018-175729 (JP), filed on Sep. 20, 2018.
Prior Publication US 2022/0032692 A1, Feb. 3, 2022
Int. Cl. B60C 13/00 (2006.01); B60C 1/00 (2006.01)
CPC B60C 13/001 (2013.01) [B60C 1/0025 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A pneumatic tire, comprising:
a side rubber provided on each of sidewall portions of the pneumatic tire and covering a carcass ply of the pneumatic tire from an outer side of the tire; and
a two-dimensional code provided on a surface of the side rubber, the two-dimensional code having a configuration in which a dot pattern is formed by two types of gray scale elements including a light element and a dark element distinguishable from each other by irregularities on the surface and in which dot holes are engraved using light, corresponding to the dark element of the gray scale elements,
the side rubber being a diene rubber comprising butadiene rubber, and
when A is a blended amount of the butadiene rubber relative to 100 parts by mass of the diene rubber contained in the side rubber and when B is a blended amount of carbon, a ratio A/B of the blended amount A to the blended amount B and a hole depth D (mm) from an opening of the dot holes to a hole bottom of the dot holes satisfying a relationship of 1.1≤(A/B)/D≤6.0, wherein
a 300% tensile modulus of the side rubber is from 5.0 to 9.0 MPa,
the blended amount A is in a range of from greater than 53 parts by mass to less than 68 parts by mass,
a hole wall surface of each dot hole is provided such that a hole cross-section decreases as approaching from the opening to the hole bottom,
a hole wall angle at a cut section of each dot hole obtained by cutting the dot hole by a plane comprising a hole center axis in a depth direction of the dot hole is from 10 to 50 degrees, with respect to the depth direction of the dot hole,
a thickness of the side rubber on a first side in a tire radial direction is greater than that on a second side, the second side being a side opposite to the first side, in a range in which the two-dimensional code is provided, and
the cut section is a cut section along the tire radial direction, and of the hole wall angles of the dot hole at the cut section, a hole wall angle θ1 on the first side in the tire radial direction is smaller than a hole wall angle θ2 on the second side in the tire radial direction.