HEAVY-DUTY TIRE

摘要

A tread portion (2) has a pair of center main grooves (11) extending zigzag and continuously in a tire circumference direction, a pair of shoulder main grooves (12), a center land portion (13), a pair of middle land portions (14), and a pair of shoulder land portions (15). The center main groove (11) has a first groove edge (11a) on the tire equator side and a second groove edge (11b) on the tread edge side. The shoulder main groove (12) has a third groove edge (12a) on the tire equator side and a fourth groove edge (12b) on the tread edge side. The middle land portion (14) is provided with a plurality of middle lateral shallow grooves (30) connecting between apex portions (11h) on the most tread edge side of the second groove edge (11b) and apex portions (12c) on the most tire equator side of the third groove edge (12a); and a plurality of first middle lateral sipes (31) extending along the middle lateral shallow grooves (30) at the groove bottoms of the middle lateral shallow grooves (30) and connecting between the center main groove (11) and the shoulder main groove (12).

主权项

1. A heavy duty tire provided in a tread portion with
a pair of center main grooves disposed on both outer sides of the tire equator and extending in a zigzag shape continuously in the tire circumferential direction, and a pair of shoulder main grooves disposed outside the center main grooves in the tire axial direction and extending in a zigzag shape continuously in the tire circumferential direction so that a center land portion between a pair of the center main grooves, a pair of middle land portions between the center main grooves and the shoulder main grooves, and a pair of shoulder land portions located outside the shoulder main grooves in the tire axial direction are defined, and wherein
the center main groove has a first groove edge on the tire equator side and a second groove edge on the tread edge side,the shoulder main groove has a third groove edge on the tire equator side and a fourth groove edge on the tread edge side,the middle land portion is provided with a plurality of middle lateral shallow grooves connecting the most tread edge side apex portions of the second groove edge of the center main groove, and the most tire equator side apex portions of the third groove edge of the shoulder main groove, a plurality of first middle lateral sipes extending along the respective middle lateral shallow grooves at the groove bottoms of the middle lateral shallow grooves and connecting the shoulder main groove and the center main groove, and a plurality of second middle lateral sipes formed between the circumferentially adjacent middle lateral shallow grooves and connecting the most tire equator side apex portions of the second groove edge of the center main groove and the most tread edge side apex portions of the third groove edge of the shoulder main groove.