Patent ID: 11951772
Assignee: THE YOKOHAMA RUBBER CO., LTD.
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 17:
18. A pneumatic tire comprising:
at least one carcass layer;
a belt layer disposed outward, in a tire radial direction, of a portion of the carcass layer located in a tread portion; and
a tread rubber layer disposed outward, in the tire radial direction, of the belt layer in the tread portion,
the tread portion being provided with a main groove extending in a tire circumferential direction, and a plurality of land portions defined by the main groove, and
in the tread portion,
assuming that a center region is a region where a center land portion included in the land portions and corresponding to the land portion closest to a tire equatorial plane is located,
shoulder regions are each a region between a position corresponding to 85% of a width of the belt layer in a tire lateral direction and an end portion of the belt layer in the tire lateral direction, and
intermediate regions are each a region between the center region and a corresponding one of the shoulder regions,
a relationship between a tire average thickness Gc in the center region and a tire average thickness Gsh in the shoulder regions and a tire average thickness Gm in the intermediate regions being within a range of 1.05≤(Gc/Gsh)≤1.35 and satisfying a relationship Gc≥Gm>Gsh, and
in the tread portion, a relationship between an average actual rubber thickness Vc of the tread rubber layer in the center region and an average actual rubber thickness Vsh of the tread rubber layer in the shoulder regions is within a range of 1.7≤(Vc/Vsh)≤2.5; wherein
a portion of rubber forming the tread rubber layer that is contained in the center region is 12 MPa or more and 16 MPa or less in modulus of 300% elongation, and
in the tread portion, a relationship between an average thickness Tc of the tread rubber layer located outward, in the tire radial direction, from the belt layer in the center region, and an average thickness Tsh of the tread rubber layer located outward, in the tire radial direction, from the belt layer in the shoulder regions is within a range of 1.7≤(Tc/Tsh)≤1.9.