Title:
AUTOMOBILE PNEUMATIC TIRE
Document Type and Number:
WIPO Patent Application WO/2015/022720
Kind Code:
A1
Abstract:
Provided is an automobile pneumatic tire such that the tire weight and rolling resistance can be greatly decreased without detracting from necessary tire performance. In a pneumatic tire, at least one layer of a carcass layer is installed between a pair of bead portions, a bead core is embedded in each bead portion, at least one layer of a reinforcement layer is disposed on an outer periphery side of the carcass layer, and a tread rubber layer is layered on the outer periphery side of the reinforcement layer. When a pair of first boundary lines is defined that passes a point of intersection of an extension of a side arc forming a tread profile and an extension of a shoulder arc and orthogonal to a tire inner surface, a pair of second boundary lines is defined passing a rim check line and orthogonal to the tire inner surface, a first region is partitioned between the pair of first boundary lines, a second region is partitioned between the first boundary lines and the second boundary lines, a third region is partitioned closer to a bead toe than to the second boundary lines, the first to the third regions have cross sectional areas (mm2) of SA, SB, and SC, respectively, and the first to the third regions respectively have periphery lengths (mm) of a, b, and c along the tire inner surface, the relationships 7.5 ≤ SA/a ≤ 11.5 and 2.0 ≤ SB/b ≤ 6.0 are satisfied with respect to the ratios SA/a and SB/b.
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Inventors:
SHIMIZU MASATOSHI (JP)
KUWAJIMA MASATOSHI (JP)
KUWAJIMA MASATOSHI (JP)
Application Number:
PCT/JP2013/071781
Publication Date:
February 19, 2015
Filing Date:
August 12, 2013
Export Citation:
Assignee:
YOKOHAMA RUBBER CO LTD (JP)
International Classes:
B60C9/08; B60C11/00; B60C13/00; B60C15/00; B60C15/06
Domestic Patent References:
| WO2012176372A1 | 2012-12-27 | |||
| WO2003082609A1 | 2003-10-09 | |||
| WO2010095688A1 | 2010-08-26 |
Foreign References:
| JPH05254308A | 1993-10-05 | |||
| JPH04221208A | 1992-08-11 | |||
| JPH08259741A | 1996-10-08 | |||
| JP2013132989A | 2013-07-08 | |||
| JP2010120479A | 2010-06-03 | |||
| JP2012176694A | 2012-09-13 | |||
| JPS60234008A | 1985-11-20 | |||
| JP2006327468A | 2006-12-07 | |||
| JPH01145202A | 1989-06-07 | |||
| JP2011005946A | 2011-01-13 | |||
| JPH05162506A | 1993-06-29 | |||
| JP2011183993A | 2011-09-22 |
Attorney, Agent or Firm:
Seiryu Patent Professional Corporation et al. (JP)
Clear stream international patent business corporation (JP)
Clear stream international patent business corporation (JP)
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