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    • 2. 发明专利
    • Pneumatic tire
    • JP5390219B2
    • 2014-01-15
    • JP2009055190
    • 2009-03-09
    • 株式会社ブリヂストン
    • 直也 越智
    • B60C11/11B60C11/03B60C11/04
    • PROBLEM TO BE SOLVED: To provide a pneumatic tire improved in on-snow performance and drainage performance in addition to a significant improvement in on-ice performance by optimizing a tread pattern. SOLUTION: This pneumatic tire includes a plurality of block lines L in a tread part 1, that have blocks 4 arranged side by side in the tire circumferential direction and demarcated by a plurality of vertical grooves 2 extended in the tire circumferential direction and a plurality of lateral grooves 3 extended in the tire width direction while mutually connecting the vertical grooves 2 adjacent to each other in the tire width direction. Moreover, a block number density D of an area with arrangement of the blocks 4 is 0.003-0.04 (pieces/mm 2 ). Furthermore, this pneumatic tire includes a plurality of inclined grooves 5 arranged in the tire circumferential direction in the tread part 1, that have groove length longer than the width W L of the block line L, and inclined and extended both in the tire circumferential direction and the tire width direction. COPYRIGHT: (C)2010,JPO&INPIT
    • 4. 发明专利
    • Pneumatic tire
    • JP5331433B2
    • 2013-10-30
    • JP2008258080
    • 2008-10-03
    • 株式会社ブリヂストン
    • 直也 越智
    • B60C11/11B60C11/03B60C11/12
    • PROBLEM TO BE SOLVED: To spectacularly improve on-ice performance by optimizing a tread pattern. SOLUTION: In the pneumatic tire, a block group G B composed by mutually densely arranging a plurality of independent blocks 3 partitioned by grooves is provided on at least one part of a tread part 1. When assuming that the reference pitch length of the block 3 of the block group G B is P (mm), the width of the group G B is W (mm), the number of the blocks 3 existing in the reference zone Z of the block group G B partitioned by the reference pitch length P and the width W is (a) (piece), and a negative rate in the reference zone Z is N (%), the block number density S per unit actual ground contact area of the block group G B given by a/äP×W×(1-N/100)} is within the range of 0.003 pieces/mm 2 -0.04 pieces/mm 2 . The blocks 3 are respectively formed into a hexagonal shape and mutually the same size. COPYRIGHT: (C)2010,JPO&INPIT