| 摘要 |
Tread band for a tire having a tread surface and comprising a plurality of recesses of total depth H* opening onto the tread surface, each recess comprising at least two cavities of a first type of cavities, each of these cavities of a first type being delimited by a main wall and having a depth Hi, the main wall of each cavity of the first type is such that its intersection with a virtual surface parallel to the running surface in the new condition and passing through the points of the said wall that are furthest towards the outside of the tread forms an exterior contour that is closed and of length Ce, the main wall of each cavity of the first type is such that its intersection with a virtual surface parallel to the running surface in the new condition and passing through the points of the main wall furthest towards the inside of the tread forms an interior contour which is closed and of length of length Ci, this tread band being characterized in that the cavities of a first type are arranged at different levels in a direction oriented from the tread surface towards the inside of the tread strip, and in that the length Ce of the exterior contour of a cavity is greater than the length Ci of the interior contour of the same cavity. |
