| 摘要 |
PROBLEM TO BE SOLVED: To provide a pneumatic tire capable of reducing columnar pipe resonance sound generated from a tire circumferential groove without reducing operation stability, limitation grip characteristic and wet performance. SOLUTION: The circumferential grooves 11, 12; a first lateral groove 13 having one end opened to the circumferential groove 11 positioned at an equatorial plane C side and the other end terminated in a land part 15 divided by the circumferential grooves 11, 12 and having a ratio of 0.4 or more of its extending length l and ground-contact length of the circumferential groove 11 embraced in a tire ground-contact surface; and a second lateral groove 14 having extending length of a half of the extending length of the first lateral groove 13 are alternately arranged on a tire tread part 10 in a tire circumferential direction. The columnar pipe resonance sound of approximately 1,000 Hz, i.e., main factor of vehicle outside noise is absorbed by the first lateral groove 13 and the secondary columnar pipe resonance sound of approximately 2,000 Hz not absorbed by the first lateral groove is absorbed by the second lateral groove 14. COPYRIGHT: (C)2006,JPO&NCIPI |
