| 摘要 |
A pneumatic tire includes a tread with land portions each having one or more sipes, and provides improved braking/driving performance on both ice and snow road surface and dry road surface, while suppressing loss of sipe edges. The sipe has a depth (D) and, as seen in a widthwise section of the sipe and in a depth direction from the tread surface (S), a perpendicular portion and a bend portion bending toward one side and then toward the other. The bend portion has, in an order in the depth direction, a first sub-bend point in a depth region of D/2-D/7, a main-bend point in a depth region of D/4-3D/4, and a second sub-bend point a depth region of D/2-6D/7, forming first and second inclined sections between the bend points. Each of the first and second inclined sections forms acute angle (¸1, ¸2) of 30° ‰¤ ¸1 ‰¤ 60° and 30° ‰¤ ¸2 ‰¤ 60°, relative to a tangent at an opening end of the sipe in the tread surface. Alternatively, the first inclined section has an area (a1) measured in a longitudinal direction of the sipe and a ratio (a1/A) of the area (a1) to an projected area (A) of the sipe in an orthogonal projection in the width direction of the sipe, and the second inclined section has an area (a2) measured in the longitudinal direction of the sipe and a ratio (a2/A) of the area (a2) to the projected area (A) of the sipe, wherein the ratios (a1/A and a2/A) are not less than 0.1. |
