Pneumatic Tire

摘要

In a pneumatic tire, shoulder blocks are formed with one of two types of values for block width measured in the tire circumferential direction. A cross-sectional shape of a tread ground contact edge of the shoulder blocks with the smaller block width value when sectioned in a plan that includes a tire axial center is formed with a squared portion formed by a curved line having a radius of curvature of 10 mm or less, or is formed with a squared portion taper cut along a straight line having a length of 10 mm or less. A cross-sectional shape of a tread ground contact edge of the shoulder blocks with the larger block width value when sectioned in the plan that includes the tire axial center is formed with a rounded portion formed by a curved line having a radius of curvature of from 30 mm to 60 mm inclusive.

主权项

1. An all-season tire comprising:
a shoulder circumferential main groove extending in a tire circumferential direction in a tread surface of the tire; a plurality of shoulder lateral grooves disposed to an outer side of the shoulder circumferential main groove in a tire width direction at intervals in the tire circumferential direction and extending in the tire width direction; and a plurality of shoulder blocks arranged in the tire circumferential direction and constituting a shoulder portion of a tread portion, each of the shoulder blocks being sandwiched by adjacent shoulder lateral grooves in the tire circumferential direction, the plurality of shoulder blocks being formed with two types of differing values for a block width measured in the tire circumferential direction, the shoulder blocks of the differing block widths being alternately disposed in the tire circumferential direction in a certain order, a cross-sectional shape of a tread ground contact edge of the shoulder blocks with the smaller block width value when sectioned in a plan that includes a tire axial center being formed with a squared portion formed by a curved line having a radius of curvature of 10 mm or less, or being formed with a squared portion taper cut along a straight line having a length of 10 mm or less, a cross-sectional shape of a tread ground contact edge of the shoulder blocks with the larger block width value when sectioned in the plan that includes the tire axial center being formed with a rounded portion formed by a curved line having a radius of curvature of from 30 mm to 60 mm both inclusive, the tread ground contact edge of the squared portion being positioned further to the outer side in the tire width direction than the tread ground contact edge of the rounded portion, and the shoulder lateral grooves with a smaller width in the tire circumferential direction being disposed adjacent to the shoulder blocks with the smaller block width value, and the shoulder lateral grooves with a larger width in the tire circumferential direction being disposed adjacent to the shoulder blocks with the larger block width value, so as to equalize a ground contact surface area in the tire circumferential direction of portions at which the shoulder blocks are provided.