| 摘要 |
Tread for civil engineering tires, having blocks in the central part and edge ribs, each block having a width Ltb measured parallel to transverse edges and a width Lcb measured along the circumferential direction, wherein each edge rib has a plurality of recesses, forming housings, with a transverse width Lte and a circumferential length Lce, delimited over the whole of its height He by transversely orientated walls and a circumferentially orientated wall, having a suitable geometry to receive at least an end part of a block of the central region with a circumferential clearance Ac in the circumferential direction and a transverse clearance At in the transverse or axial direction, these clearances determined to ensure that, in the usual running conditions of the tire the end part of said block of the central region is at least partially in contact with at least one of the transversely orientated walls of each recess, thereby preventing each of the blocks, having its ends locked in said recesses, from coming into contact with the neighbouring blocks of the central row. |
| 主权项 |
1. Tread 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:
a plurality of generally transversely orientated grooves, having a depth Pt and a mean width Dt, the transverse grooves and the circumferential grooves delimiting:a single row comprising a plurality of blocks spaced apart from one another in the circumferential direction, each block having:
a contact wall intended to come into contact with the ground during running, andlateral walls cutting the contact wall along edges, some of which are orientated in the circumferential direction, while the others are orientated in the transverse direction,a width Ltb measured in a direction parallel to the transverse edges, anda width Lcb measured in the circumferential direction, each edge row (B) being formed by a continuous rib having a contact wall intended to come into contact with the ground during running and two lateral walls spaced apart at a distance Ltn corresponding to the maximum width of the rib, each of these lateral walls delimiting with the blocks a circumferential groove; 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). |
