Pneumatic tire with tread having V-shaped groove

摘要

At least one of land portion sections 14, 15, 16 that are formed in a tread surface portion 10a is constituted by a first land portion 17 and a second land portion 18 being alternately and consecutively arranged along the tire circumference direction R, and a first top surface portion 17a and a first inclined surface portion 17b whose recess amount inward in a radial direction of the tire gradually increases in accordance with heading from the first top surface portion 17a toward the outer side in a width direction of the tire H are provided in a first land portion 17, and a second top surface portion 18a and a second inclined surface portion 18b whose recess amount inward in the radial direction of the tire gradually increases in accordance with heading from the second top surface portion 18a toward the inner side in the width direction of the tire H are provided in a second land portion 18, and by the first inclined surface portion 17b and the second inclined surface portion 18b mutually overlapping in the circumferential direction of the tire R, a V-shaped groove that has the first inclined surface portion 17b and the second inclined surface portion 18b as portions of side walls is formed. According to the present invention, it is possible to prevent a decline in steering stability and to improve drainage performance.

主权项

1. A pneumatic tire comprising:
a plurality of circumferential direction main grooves extending in a circumferential direction of the tire and formed in a tread surface portion of the tire; and a plurality of land portion sections extending in the circumferential direction of the tire and formed in the tread surface portion, wherein at least one of the land portion sections that are arranged at positions that are separated from an equatorial portion of the tire among the plurality of land portion sections is constituted of a first land portion and a second land portion that are alternately and consecutively arranged in the circumferential direction of the tire, a first top surface portion that is positioned on the inner side of a width direction of the tire and a first inclined surface portion whose recess amount inward in the radial direction of the tire gradually increases in accordance with heading from the first top surface portion toward the outer side in the width direction of the tire are provided in the first land portion, a second top surface portion that is positioned on the outer side of the width direction of the tire and a second inclined surface portion whose recess amount inward in the radial direction of the tire gradually increases in accordance with heading from the second top surface portion toward the inner side in the width direction of the tire are provided in the second land portion, and by the first inclined surface portion and the second inclined surface portion mutually overlapping in the circumferential direction of the tire, one of the plurality of circumferential direction main grooves is formed in this land portion section as a V-shaped groove that has the first inclined surface portion and the second inclined surface portion as portions of side walls, the V-shaped groove is disposed only further to an outer side of a vehicle on which the tire is mounted, than the equatorial portion, a second one of the plurality of circumferential direction main grooves includes a bottom surface continuously extending in the circumferential direction of the tire, the second one of the plurality of circumferential direction main grooves is entirely disposed further to an inner side of the vehicle than the first land portion, and wherein the second one of the plurality of circumferential direction main grooves is disposed to be adjacent to the first land portion, and has a constant depth on the entire circumference of the tire, a first groove is formed between two first land portions adjacent to each other in the circumferential direction, and an inward end of the second inclined surface portion on the inner side in the width direction of the tire connects to a bottom of the second one of the plurality of circumferential direction main grooves via a bottom of the first groove no circumferential direction main groove formed by overlapping land portions in the circumferential direction is disposed at the equatorial portion and further to the inner side of the vehicle, than the equatorial portion.