| 摘要 |
PROBLEM TO BE SOLVED: To provide a pneumatic tire capable of effectively reducing the noise attributable to the columnar resonance of a circumferential major groove. SOLUTION: A plurality of land parts 51 are formed by combining a plurality of kinds of pitches on a tire tread of a tread part 12. A lug groove 32 is formed on each land part 51 along the direction across a circumferential main groove 22, each lug groove 32 is connected to the circumferential major groove 22 at one end of the groove longitudinal direction, and the other end in the groove longitudinal direction is terminated in each land part 51. In addition, the groove volume of the lug groove 32 is at least two kinds for the circumferential major groove in a tire ground contact surface. Thus, the pitch variation is introduced in the tread pattern, the lug groove 32 with one side closed in a bag shape is connected to the circumferential major groove 22, and the groove volume of the lug groove 32 is at least two kinds for the circumferential major groove 22 in the tire ground contact surface to enhance the reducing effect of the columnar resonance sound generated in the circumferential major groove 22. COPYRIGHT: (C)2007,JPO&INPIT |
