| 摘要 |
PURPOSE:To improve the durability and moving performance of a lug tire of a large vehicle formed with multiple lateral grooves from both shoulders toward the center of a tread by devising the shape of lateral grooves and specifying the dynamic elastic modulus or the like of the tread rubber. CONSTITUTION:A lug tire is formed with multiple lateral grooves 5 from both shoulders 3 toward the center 4 in turn and point-symmetrically across the center 4 on a tread section 2. In this case, each lateral groove 5 is formed with a straight-line region 10 located on the shoulder 3 side having a crossed axes angle theta between an edge line 6 on the opening side and the meridian L of the tire within a range of -5 deg.-5 deg. and a slant region 11 having a crossed axes angle alpha between the center line M in the width direction and the meridian L within a range of -40 deg.--20 deg. or within a range of 20 deg.-40 deg.. The tread section 2 is formed with rubber having a dynamic elastic modulus within a range of 7.8X10<7>-9.5X10<7>(kg/mm<2>), a loss tangent within a range of 0.18-0.23, and a value of the loss tangent divided by the dynamic elastic modulus within a range of 2.0X10<-9>-2.5X10<-9>(mm<2>/kg). |
