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:
Mar. 22, 2011
Filed:
May. 29, 2007
Kiyoto Maruoka, Kobe, JP;
Kiyoto Maruoka, Kobe, JP;
Sumitomo Rubber Industries, Ltd., Kobe, JP;
Abstract
A heavy duty tire comprises a bead filler disposed in each bead portion (). The bead filler () comprises: a main layer () having a complex elastic modulus E*of from 2.0 to 6.0 Mpa; and a fastening layer () having a complex elastic modulus E*of from 20 to 70 Mpa. The fastening layer comprises a base portion (B) and an axially inner portion (A) to have a L-shaped cross section. The height Ha of the axially inner portion (A) is 35 to 100 mm and not more than the height Hb of the main layer (), and the radial height Hb is 40 to 100 mm, each from the bead base line. The thickness of the axially inner portion (A) gradually decreases towards the radially outside so that, when measured along a straight line Xdrawn perpendicularly to the axially outer surface of the bead filler from a point Pthereon at a distance of 25 mm radially outward from the bead base line: the thickness Tb from the axially outer surface of the bead filler to the interface between the axially inner portion (A) and the main layer is 7.0 to 13.0 mm; the thickness Ta from the interface to the axially inner surface of the axially inner portion (A) is 1.0 to 4.0 mm; and the ratio Ta/Tb is 0.1 to 0.35.