Document Type and Number:
Japanese Patent JP2010155478
Kind Code:
A
Abstract:
To rapidly improve on-ice performance by optimizing a tread pattern.
This pneumatic tire includes a small block group GBconstituted by mutually and densely arranging a plurality of independent small blocks 3 in a tread part 1. When a reference pitch length of the small block 3 is PL (mm), a width of the small block group GBis W (mm), the number of the small blocks 3 existing in a reference region of the small block group GBsectioned by the reference pitch length PL and the width W is a (piece) and a negative ratio in the reference region is N(%), small block number concentration D per unit actually grounding area of the small block group GBgiven by a/(PL×W×(1-N/100)) is in the range of 0.003 (piece/mm2) to 0.04 (piece/mm2). Each of the small blocks 3 has a star-like polygonal shape in a tread step surface and is mutually and jointly formed.
COPYRIGHT: (C)2010,JPO&INPIT
Application Number:
JP2008333438A
Publication Date:
July 15, 2010
Filing Date:
December 26, 2008
Assignee:
BRIDGESTONE CORP
International Classes:
B60C11/11; B60C11/03; B60C11/12
Domestic Patent References:
| JPH08318710A | 1996-12-03 | | | |
| JPH09123712A | 1997-05-13 | | | |
| JP2002528334A | 2002-09-03 | | | |
Foreign References:
| US3998256A | 1976-12-21 | | | |
| US4312395A | 1982-01-26 | | | |
Attorney, Agent or Firm:
Kenji Sugimura
Kiyoshi Kuruma
Tatsuya Sawada
Kazuyuki Tomita
