Title:
空気入りタイヤ
Document Type and Number:
Japanese Patent JP5922688
Kind Code:
B2
Abstract:
To significantly improve performances on ice by optimizing a tread pattern. This pneumatic tire has, in at least a part of a tread portion 1, a block group G B formed by arranging blocks 3 close to each other, the blocks being defined by grooves 2 and being independent of each other, and when a symbol P (mm) stands for a reference pitch length of the blocks in the block group G B , a symbol W (mm) stands for a width of the block group G B , a symbol a (pieces) stands for the number of the blocks 3 existing in a reference zone Z of the block group G B , the reference zone being comparted by the reference pitch length P and the width W, and a symbol N (%) stands for a negative ratio in the reference zone Z, a block number density S, which is the number of the blocks per unit of an actual ground contact area of the block group G B and given by a formula of S = a/{P × W × (1 - N/100)}, is set within a range of not less than 0.003 (pieces/mm 2 ) but not more than 0.04 (pieces/mm 2 ).
Inventors:
Naoya Ochi
Application Number:
JP2014034177A
Publication Date:
May 24, 2016
Filing Date:
February 25, 2014
Export Citation:
Assignee:
Bridgestone Corporation
International Classes:
B60C11/03; B60C11/00
Domestic Patent References:
| JP4176712A | ||||
| JP2002248906A | ||||
| JP5077613A | ||||
| JP11042911A | ||||
| JP55123509A | ||||
| JP3136911A | ||||
| JP50037104A |
Attorney, Agent or Firm:
Kenji Sugimura
Tsukanaka Tetsuo
Tsukanaka Tetsuo
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