| 摘要 |
<p>Tread (1) for civil engineering work vehicle tyre, this tread having a wearable thickness of material EMU, this tread (1) comprising solid parts forming raised elements (2) delimited by grooves (3, 4), each solid part comprising a contact face and opening onto this contact face (20) at least one cavity (5) of maximum depth at least greater than 50% of the wearable thickness EMU, each cavity (5) opening onto the contact face (20) in the as-new state and being delimited by a wall surface and a bottom surface, each wall surface (51) delimiting a cavity (5) intersecting the contact face (20) along an edge contour (53) having a geometry comprising a major axis AA and a minor axis BB, the length of the major axis AA being at least equal to 1.5 times the length of the minor axis BB in the as-new state, this tread being such that for any tread surface down to a predefined level of wear, this level being at most equal to 30% of the wearable thickness of material EMU, the edge contour (53') of each cavity (5) considered on said tread surface is such that the angle that the major axis AA makes with the circumferential direction is at least equal to 0 degrees and at most equal to 40 degrees, and in that beyond a predefined level of wear, the angle that the major axis A'A' makes with the circumferential direction is greater than 40 degrees and greater than the angle that the major axis AA makes with the circumferential direction on the tread surface in the as-new state.</p> |
