PNEUMATIC TIRE - BRIDGESTONE CORP

Title:

PNEUMATIC TIRE

Document Type and Number:

WIPO Patent Application WO/2013/111576

Kind Code:

A1

Abstract:

This pneumatic tire is configured by joining a tread portion, a pair of sidewall portions, and a pair of bead portions, is provided with at least one-ply carcass configured from a ply body portion (6a) extending toroidally between a pair of bead cores buried in the bead portions, and a winding portion (6b) extending from the ply body portion (6a) and wound around each of the bead cores from the inside to the outside in a tire width direction, and further comprises a recessed portion (7) recessed inward in the tire width direction in a tire outer surface from a rim separation point (F) to the tire maximum width position (P1) of the sidewall portion, the pneumatic tire being characterized in that when, in a cross section in the tire width direction in a rim-unassembled state in which assembly to a rim is not performed, the range from the innermost point (7a) in the tire diameter direction of the tire outer surface that demarcates the recessed portion (7) to a point a peripheral length of 8 mm away outward in the tire diameter direction along the periphery of the tire outer surface is defined as a tire diameter direction innermost region, with an intersection point of a normal line (m) drawn from the center (C) of curvature of an arc when a curve constituting the tire diameter direction innermost region is approximated by the arc by the least squares method to a portion protruding outward in the tire width direction of the ply body portion (6a) and the ply body portion as (A), and an intersection point of a reference line (n) passing through the center (C) of curvature and parallel to a tire rotating shaft and the ply body portion (6a) as (B), the elevation angle (α) of the intersection point (A), which a straight line (q) connecting the two points (A, B) forms with the reference line (n) is 40-60°, and the radius of curvature of the arc is 5-80 mm.

Inventors:

KURITA KEIICHI (JP)

Application Number:

PCT/JP2013/000304

Publication Date:

August 01, 2013

Filing Date:

January 23, 2013

Export Citation:

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Assignee:

BRIDGESTONE CORP (JP)

International Classes:

B60C15/00; B60C9/08; B60C13/00

Domestic Patent References:

WO2009051260A1	2009-04-23
WO2009051260A1	2009-04-23

Foreign References:

JP2003063217A	2003-03-05
JP2004535976A	2004-12-02
JP2000016036A	2000-01-18
JP2011088565A	2011-05-06
JP2010111370A	2010-05-20
JPS6061305A	1985-04-09
JP2002521253A	2002-07-16
JP2001225618A	2001-08-21
JP2003531057A	2003-10-21

Other References: