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:
Jul. 14, 2015
Filed:
Feb. 10, 2009
Yasutoshi Aoki, Higashiyamato, JP;
Yasutoshi Aoki, Higashiyamato, JP;
BRIDGESTONE CORPORATION, Tokyo, JP;
Abstract
The present invention provides a pneumatic radial tire for heavy load, having lug grooves in respective side regions of a tread surface, in which tire an amount of slip of the trailing edge of each of land portions defined by the lug grooves, with respect to a road surface, when the tire is rotated with load applied thereon is advantageously reduced without causing decrease in partial wear resistance of the land portions at a road contact surface thereof and generating cracks at the lug groove bottom. The pneumatic radial tire for heavy load, having a plurality of lug groovesprovided in respective side regions of a tread surfaceto extend in the tread width direction, open at respective side edges of the tread surface, and define land portionstherebetween, is characterized in that: in a cross section of each lug groovein the width direction thereof, only a groove wallon the step-in side of each land portionis bent at at least one bent point in the depth direction of the corresponding lug groovesuch that a portionof the groove wall, located on the inner side in the radial direction than the bent point f, is tilted in a direction that narrows a groove width.