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Patent Searching and Data


Title:
PNEUMATIC TIRE
Document Type and Number:
WIPO Patent Application WO/2015/019990
Kind Code:
A1
Abstract:
 This pneumatic tire improves fuel efficiency (i.e., rolling resistance and air resistance) while maintaining wear resistance in shoulder sections. If a tire cross-section width is denoted as Wt (unit: millimeters) and a bead diameter is denoted as Db (unit: inches), the following equations (1) and (2) are satisfied. (1) Wt ≤ -0.7257 × (Db)2 + 42.763 × Db - 339.67 (2) Wt ≥ -0.7257 × (Db)2 + 48.568 × Db - 552.33 (2) Furthermore, if positions in the tire axis direction are denoted as Py, wherein y represents the ratio between the distance in the tire axis direction from the tire center and a distance L in the tire axis direction from the tire center to the maximum width position on the carcass, and the tread thickness, which is the distance in the tire radial direction from the outer surface of the carcass to the outer surface of a tread section at each position Py in the tire axis direction, is denoted as t(y), in the tread thickness distribution curve f(y) represented by equation (3) below, when y = 0.4, f(y) ranges from 0.03 to 0.06, and the rate of change of f(y) increases to y = 0.4 and decreases thereafter. (3) f(y) = 1 - t(y) / t(0)

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Inventors:
ASANO KAZUO (JP)
KUBOTA YASUHIRO (JP)
Application Number:
PCT/JP2014/070451
Publication Date:
February 12, 2015
Filing Date:
August 04, 2014
Export Citation:
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Assignee:
SUMITOMO RUBBER IND (JP)
International Classes:
B60C11/00; B60C3/04
Domestic Patent References:
WO2012176476A12012-12-27
Foreign References:
JP2004017903A2004-01-22
JP2004010781A2004-01-15
JP2004002622A2004-01-08
Other References:
See also references of EP 3023266A4
Attorney, Agent or Firm:
SUMITOMO Shintaro (JP)
Shintaro Sumitomo (JP)
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