| 摘要 |
PROBLEM TO BE SOLVED: To improve eccentric abrasion resistance without hindering wettability, on-snow performance and operation stability. SOLUTION: A circumferential groove 2 continuously extended in the circumferential direction is provided in a half part of a tread 1 in a range of 10-30% of the tread width W from a tread end E. A plurality of curved and inclined grooves 3 are extended from the circumferential groove 2 toward a central part of the tread 1 so that acute anglesα,β,γagainst the circumferential direction are gradually reduced as they separate from the circumferential groove 2. A land part line 5 formed of tapered land parts 4, of which width is formed to be gradually reduced as it comes close to the central part of the tread 1, is formed in the tread 1. Sipes 6 and 7 respectively extended straight without crossing each other are alternately provided in each of the tapered land parts 4 of the land part line 5 at two kinds of angles, large and small, relative to the circumferential direction, and the angle of the one sipe 6 relative to the circumferential direction is set in a range of 75-90°, and the angle of the other sipe is set in a range of 30-60°. COPYRIGHT: (C)2007,JPO&INPIT |
