Patent ID: 9358839
Filing Date: 2016-06-07
CPC Classification: B60C

Claim Text:
1. A heavy duty pneumatic tire, comprising: a tread comprising a crosslinked rubber and having an outer surface forming a tread surface; and a belt positioned inward of the tread in a radial direction such that a ratio of a width of the belt to a width of the tread is greater than or equal to 0.95 and is not greater than 1.0, wherein the tread has a base layer and a cap layer formed outward of the base layer in the radial direction, the tread has a plurality of main grooves extending in a circumferential direction and a plurality of land portions aligned with each other in an axial direction, the plurality of land portions includes a plurality of shoulder land portions positioned on outer sides in the axial direction, the cap layer has a body portion and a pad, the pad is joined to a cut portion of the body portion formed in an outer side portion in the axial direction, a ratio of a thickness of the pad to a thickness of each of the shoulder land portions is greater than or equal to 0.30 and is not greater than 0.35, a ratio of a width of the pad to a width of each of the shoulder land portions is greater than or equal to 0.30 and is not greater than 0.60, the body portion has a complex elastic modulus which is greater than or equal to 4.95 MPa and is not greater than 5.45 MPa, the pad has a complex elastic modulus which is greater than the complex elastic modulus of the body portion, the pad has a loss tangent which is greater than or equal to 0.108 and is not greater than 0.122, the body portion has a loss tangent which is less than the loss tangent of the pad, each of the shoulder land portions has a ground-contact surface in a state where the tire is in contact with a ground, and the ground-contact surface of each of the shoulder land portions has an outer ground-contact surface and an inner ground-contact surface positioned inward of the outer ground-contact surface in the axial direction and separated by a boundary between the body portion and the pad such that a ratio of an average ground-contact pressure of the outer ground-contact surface relative to an average ground-contact pressure of the inner ground contact surface is greater than or equal to 0.85 and is not greater than 0.95.