| 摘要 |
A tread (10) for a heavy truck tyre, said tread comprising four grooves (21, 22) of general circumferential orientation delimiting a central region (30), intermediate regions (40) and edge regions (50), each of the intermediate regions (40) being divided into a plurality of elongate relief elements (41), said elongate relief elements (41) delimiting oblique grooves (44) opening into the circumferential grooves (21, 22) and being inclined at an average angle of between 30 degrees and 60 degrees relative to the circumferential direction, said elongate relief elements (40) having an average length in the circumferential direction of between 50 and 70 mm, the depth of the oblique grooves (44) being at least equal to 30% of the depth of the circumferential grooves (21, 22), each elongate relief element (41) comprising a plurality of incisions (45) opening into the oblique grooves (44). This tread is designed such that each elongate relief element (41) further comprises an oblique internal cutout (46) having a total depth at least equal to 75% of the thickness of material to be worn PMU, said oblique cutout comprising a wide portion and a portion forming an incision, said incision being extended by a channel intended to form a new groove after wear. |
