Title:
HEAVY LOAD PNEUMATIC RADIAL TIRE
Document Type and Number:
WIPO Patent Application WO/2013/061602
Kind Code:
A1
Abstract:
Provided is a heavy load pneumatic radial tire with which it is possible to effectively suppress progress of destruction within a low-heat-generating base rubber, which contributes to an improvement in high-speed durability, to achieve high durability. In the heavy load pneumatic radial tire according to the present invention, a tread rubber (6) is formed by laminating a cap rubber (5) and a base rubber (4), and at least four belt layers (3a through 3e) are arranged at a radial direction inner side of the tread rubber (6). A radial direction outer side of a width directional edge of at least one of the radial direction outermost belt layer (3e) and the widest belt layer (3c) is covered by a reinforcing rubber layer (7), stopping without reaching a tire equatorial plane (E), at a radial direction inner side of the tread rubber (6). A correlation in terms of modulus of repulsion elasticity between a reinforcing rubber which forms the reinforcing rubber layer (7) and the base rubber (4) satisfies the condition of reinforcing rubber < base rubber (4).
Inventors:
MATSUMURA HIROYUKI (JP)
Application Number:
PCT/JP2012/006870
Publication Date:
May 02, 2013
Filing Date:
October 25, 2012
Export Citation:
Assignee:
BRIDGESTONE CORP (JP)
International Classes:
B60C11/00; B60C9/20
Domestic Patent References:
| WO2003086782A1 | 2003-10-23 |
Foreign References:
| JPH07132707A | 1995-05-23 | |||
| JP2008544912A | 2008-12-11 | |||
| JP2007196866A | 2007-08-09 | |||
| JP2009052158A | 2009-03-12 | |||
| JPS61135803A | 1986-06-23 |
Other References:
See also references of EP 2772368A4
Attorney, Agent or Firm:
SUGIMURA, KENJI (JP)
Kenji Sugimura (JP)
Kenji Sugimura (JP)
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Claims: