Title:
PNEUMATIC TIRE
Document Type and Number:
Japanese Patent JP2021185055
Kind Code:
A
Abstract:
To provide a pneumatic tire that enables reduction of passing noise generated during acceleration and enables securement of excellent steering stability.SOLUTION: The pneumatic tire is provided which comprises a tread portion, a pair of side wall portions and a pair of bead portions, and in which a plurality of main grooves 10 extending in a tire circumferential direction are formed in the tread portion. A tread rubber layer 11 arranged in the tread portion has at least two-layered laminate structure which includes a first rubber layer 11A positioned at an outermost side in a tire radial direction and a second rubber layer 11B arranged adjacent to inside in the tire radial direction, of the first rubber layer. A thickness d1 of the first rubber layer 11A is in a range of 0.5 mm-2.5 mm, and JIS-A hardness Hs1 of the first rubber layer 11A is in a range of 50-65. A thickness d2 of the second rubber layer 11B is larger than the thickness d1 of the first rubber layer 11A. JIS-A hardness Hs2 of the second rubber 11B is in a range of 65-80, and a difference in hardness (Hs2-Hs1) between the first rubber layer 11A and the second rubber layer 11B is equal to 5 or more.SELECTED DRAWING: Figure 2
Inventors:
NIIZAWA TATSURO
Application Number:
JP2020090223A
Publication Date:
December 09, 2021
Filing Date:
May 25, 2020
Export Citation:
Assignee:
YOKOHAMA RUBBER CO LTD
International Classes:
B60C11/00
Attorney, Agent or Firm:
Seiryu International Patent Service Corporation
Takayoshi in the daytime
Masao Sakaizawa
Takayoshi in the daytime
Masao Sakaizawa