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:
Sep. 11, 2012
Filed:
Jun. 28, 2007
Masanori Aoyama, Kodaira, JP;
Masanori Aoyama, Kodaira, JP;
Bridgestone Corporation, Tokyo, JP;
Abstract
There are provided a pneumatic radial tire of heavy load vehicles, in which durability of a belt is improved. A pneumatic radial tire for heavy load vehicles comprises a pair of bead portions in each of which a bead core is embedded, a radial carcass plyextending from one bead portion to the other bead portion and turned around the bead core from an inner side to an outer side of the bead core in a width direction of the tire and at least six belt layersdisposed on an outer side of this radial carcass plyin a radial direction of the tire, wherein the following relations are satisfied: W>W>W, where Wis a maximum width of first and second beltsf the belt layers, Wis a maximum width of third and forth beltsof the belt layersand Wis a maximum width of fifth and sixth beltsof the belt layers; and>D/D, where Dis a cord diameter of the first and second belts and Dis a cord diameter of the third and forth belts. In addition, a steel cord of each belt layer has a double twist structure in which a plurality of steel filaments are twisted to form a cable and two to ten cables are further twisted.