| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To improve drainage performance and gripping performance during turning. <P>SOLUTION: A tread part includes a pair of circumferential grooves at both sides of a tire equator and tilted grooves which are disposed at an interval circumferentially outside the circumferential grooves and extended in a tire reverse rotation direction toward the outside in an axial direction. The tilted grooves alternately include tilted main grooves which are extended from inner ends which do not intersect the circumferential grooves to outer ends which are outside a ground-contact end in the axial direction during normal running and inside a ground-contact end in the axial direction during limit running and tilted auxiliary grooves extended from inner ends between the inner ends of the tilted main grooves and the ground-contact end during normal running to outer ends located at least at the ground contact end during limit running in a circumferential direction. A part of a groove wall surface 9f at the first landing side in the rotational direction of the tilted groove 4 extended in a ground contact area during turning comprises a reinforced groove wall surface 10 including a slack slope part 7 at the tread side which forms an angle of 60-80°relative to a tire normal N in a cross section perpendicular to the longitudinal direction of the groove and a steep slope part 8 which extends at an angle of 3-20°relative to the tire normal N from the slack slope part 7 to the inside in a radial direction. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
