Patent ID: 9604505
Date: 2017-03-28
CPC Classifications: B60C

Claim:
1. A tread for a civil engineering tire, having a thickness of material wearable during running in the range from 25 mm to 110 mm, comprising: two generally circumferentially orientated grooves having a depth Pc dividing the tread into a central region (C) and edge regions (B), the central region (C) comprising: wherein the lateral wall of each edge rib comprises a plurality of recesses with a transverse width Lte and a circumferential length Lce, each recess being delimited over the whole of its height He by transversely orientated walls and a circumferentially orientated wall, each recess having a suitable geometry to receive at least an end part of a block of the central region (C) with a circumferential clearance Ac, measured in the circumferential direction, and a transverse clearance At, measured in the transverse or axial direction, these clearances Ac and At being determined so as to ensure that, in the usual running conditions of the tire provided with said tread, each end part of said block of the central region is at least partially in contact with transversely orientated walls of the recess, in such a way that each of the blocks, having its ends locked in said recesses is prevented from coming into contact with the neighbouring blocks of the central row (C), and wherein the length Ltp of each end of a block entering a recess is at least equal to 7% of the total transverse width Ltb of said block.