| 摘要 |
PROBLEM TO BE SOLVED: To provide a pneumatic tire effectively suppressing stone bite by optimizing a cross-sectional shape of a stepped land part arranged in a circumferential groove for suppressing the eccentric wear of a tread portion. SOLUTION: The pneumatic type 1 comprises: at least one circumferential groove 3 extending in the circumferential direction; and the stepped land part 7 raised from a groove bottom 4 of the circumferential groove 3, and positioned radially inward from a tread face of the tread portion 6 within a range wherein a top surface 5 contacts with a road surface in grounding. In cross-sectional view in the width direction, in the circumferential groove 3 comprising the stepped land part 7, one groove wall 8 has a groove wall bottom portion 9 with a comparatively small tilting angle in regard to the tire diameter direction, and a groove top portion 10 with a comparatively large tilting angle in regard to the tire diameter direction. In the stepped land part 7, a side wall 11 opposite to the groove wall 8 in the circumferential groove 3 has a side wall bottom portion 12 with a comparatively small tilting angle in regard to the tire diameter direction, and a side wall top portion 13 with a comparatively large tilting angle in regard to the tire diameter direction. COPYRIGHT: (C)2004,JPO |
