Patent ID: 8985168
Filing Date: 2015-03-24
Classification: B60C,Y10S

Abstract:
1. A pneumatic tire including a tread section provided with circumferential grooves extending in a tire circumferential direction, lateral grooves extending in a tread width direction, and a plurality of land blocks defined by the circumferential grooves and the lateral grooves, each of the land blocks provided with a plurality of sipes formed to extend to a predetermined depth from a tread surface inward in a tire radial direction, each of the sipes having an end portion communicating with at least any one of the circumferential grooves and the lateral grooves, wherein at least one of the plurality of sipes includes an expanded diameter section on an inner end of the sipe in the tire radial direction, the expanded diameter section is smallest in diameter in a center portion thereof and largest in diameter in side portions thereof, the center portion of the expanded diameter section is formed to increase in diameter gradually and smoothly toward each of sidewalls of the land block, and each side portion of the expanded diameter section has a substantially constant diameter along a length of 10% to 35% of the entire length of the expanded diameter section from both ends of the expanded diameter section in the longitudinal direction thereof.