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1. (WO2018105153) TIRE FOR HEAVY LOAD

Pub. No.:    WO/2018/105153    International Application No.:    PCT/JP2017/022575
Publication Date: Fri Jun 15 01:59:59 CEST 2018 International Filing Date: Tue Jun 20 01:59:59 CEST 2017
IPC: B60C 9/18
B60C 1/00
D07B 1/06
Applicants: BRIDGESTONE CORPORATION
株式会社ブリヂストン
Inventors: SAITO Noboru
齋藤 昇
Title: TIRE FOR HEAVY LOAD
Abstract:
Provided is a tire for heavy load, which is able to have further improved durability by achieving a good balance between excellent wear resistance of a tread part and excellent cracking resistance of a belt at higher levels even in cases where the width of the belt is increased. According to the present invention, the width W3 of a third belt (16c) of a belt layer (16) that is arranged between a carcass (14) and a tread part (11) is 65-85% of the maximum tire width Wm, and the width W4 of a fourth belt (16d) of the belt layer (16) is 55-75% of the maximum tire width Wm. The metal cords used for a metal cord-rubber composite that constitutes the third belt and the fourth belt (16c, 16d) contain from 2% by atom to 60% by atom (inclusive) of N atoms in the surfaces, while having a Cu/Zn ratio of from 1 to 4 (inclusive). The rubber composition which covers the metal cords contains 1-15 parts by mass of silica and 0-1 part by mass of a cobalt-containing compound per 100 parts by mass of the rubber component.