US Patent 7997318 Heavy-load tire with wind bead structure

Patent 7997318 was granted and assigned to Sumitomo Rubber Industries on August, 2011 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

Sumitomo Rubber Industries

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

79973180

Patent Inventor Names

Kiyoto Maruoka0

Date of Patent

August 16, 2011

Patent Application Number

121492390

Date Filed

April 29, 2008

Patent Primary Examiner

‌

Adrienne C. Johnstone

Patent abstract

A heavy-load tire has a wind bead structure in which a turned-up portion of a carcass ply is wound around a bead core, in which a bead portion is equipped with a bead reinforcing layer having a U-shaped cross section and a bead apex rubber having a triangular-shaped cross section. The turned-up portion has an auxiliary turned-up portion passing through the vicinity of a radially outer side of the bead core. The bead apex rubber includes a high complex elasticity modulus inner apex portion disposed at a radially inner side and a low complex elasticity modulus outer apex portion disposed at a radially outer side.