The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 11, 2012
Filed:
Nov. 10, 2008
Shun Oogane, Kodaira, JP;
Shun Oogane, Kodaira, JP;
Bridgestone Corporation, Tokyo, JP;
Abstract
An of object of the present invention is to provide a pneumatic tire which exhibits improved durability of a bead portion due to further suppressing compression strain at a carcass ply fold-up portion and, in particular, suppressing fatigue fracture at the carcass ply fold-up portion. Cord distance between the carcass main body and the carcass ply fold-up portion gradually decreases from the bead core toward the outer side in the tire radial direction to reach the minimum value a, then gradually increases to the maximum value b; provided that height Hof a flange of an application rim, measured from a base line of the application rim in a state where the tire is assembled with the rim and inflated at a prescribed internal pressure, is 1, heights Hand Hmeasured from the base line to the positions on the carcass main body corresponding to the minimum and the maximum values, respectively, and the maximum height Hof the tire satisfy relationship formulae below,H≧8.001.26≦H≦2.142.43≦H≦3.75; anda value of ratio (b/a) of the maximum value b with respect to the minimum value a of distance between cords of the carcass main body and the carcass ply fold-up portion exceeds 1.00.