| 摘要 |
PROBLEM TO BE SOLVED: To reduce manufacturing cost, and to easily improve tire performance other than reduction of noise. SOLUTION: Shallow grooves 14 and 15 are formed on a side of a width direction of a main groove 13 to be communicated with the main groove 13, extend continuously in a peripheral direction and have groove depths shallower than that of the main groove 13, and thereby groove bottoms 14a and 15a of the shallow grooves 14 and 15 vibrate in addition to a groove bottom 13a of the main groove 13 (area of the vibrating groove bottoms is increased) to absorb more vibration energy of column tube resonance sound. As a result, the column tube resonance sound is effectively reduced. At the time, the groove depths of the shallow grooves 14 and 15 are shallower than that of the main groove 13, and thereby reduction of volume of tread rubber is reduced. As a result, lowering of wear durability can be effectively suppressed. COPYRIGHT: (C)2011,JPO&INPIT |
