| 摘要 |
PROBLEM TO BE SOLVED: To provide a pneumatic tire, implementing compatibility of improvement in steering stability with reduction of low-frequency load noise. SOLUTION: This pneumatic tire 1 is formed by providing three rubber members as a reinforcing layer 21 on a side wall part 3. These rubber members are sequentially provided to overlap each other in the radial direction of the tire. These rubber members are arranged extending inward from the outside in the radial direction of the tire in the order of an upper reinforcing layer 22, a middle reinforcing layer 25 and a lower reinforcing layer 28. The upper reinforcing layer 22 and the lower reinforcing layer 28 are formed of rubber material having high hardness. Thus, a lateral spring constant and a circumferential spring constant are increased to improve the steering stability. The middle reinforcing layer 25 is formed of rubber material having low hardness. Therefore, the middle reinforcing layer 25 can be reduced in longitudinal spring constant to reduce low-frequency load noise. Accordingly, concurrently with the improvement in steering stability, low-frequency load noise can be reduced. COPYRIGHT: (C)2005,JPO&NCIPI
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