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AssigneesMichelin Recherche et Technique S.A., Societe De Technologie Michelin
InventorsJacques Barraud, Agnes Poulbot
Estimating the term…
Tyre tread band (1) having a tread surface (10) to come into contact with the road surface, this tread band comprising at least two wearing layers (C1, C2, C3) which are superposed in the thickness of the tread, this tread band (1) having a first wearing layer (C1) formed by a plurality of raised elements (21, 22) each comprising a contact surface, this first layer comprising at least grooves (20, 20′) of circumferential overall orientation, this first layer being intended to be in contact with the road surface when the tread is new, and at least one other wearing layer (C2, C3) coming into contact with the road surface after the first layer (C1) has entirely worn away, each other wearing layer comprising at least one channel (30) extending in the circumferential overall direction, each channel (30) opening onto the tread surface as soon as the said wearing layer is reached after the wearing layer that proceeds it has completely worn away, this tread band being such that each wearing layer (C2, C3), distinct from the first wearing layer (C1), comprises a plurality of transverse incisions (31) distributed in the circumferential direction, each transverse incision extending from a channel (30) of the layer in question in a direction which is not circumferential so as to open fully or partially into at least one other circumferentially oriented channel or groove, and do so irrespective of the level of wear of the said other wearing layer.
1-9. (canceled)
A tire tread band having a tread surface to come into contact with the road surface, this tread band comprising at least two wearing layers (C1, C2, C3) which are superposed in the thickness of the tread, this tread band having a first wearing layer (C1) and at least one other wearing layer (C2, C3), the first wearing layer (C1) being formed by a plurality of raised elements each comprising a contact surface, this first layer comprising at least grooves of circumferential overall orientation, this first layer being intended to be in contact with the road surface when the tread is new, each other wearing layer (C2, C3) coming into contact with the road surface after the first layer (C1) has entirely worn away, this other wearing layer comprising at least one channel extending in the circumferential overall direction, this at least one channel opening onto the tread surface as soon as the said wearing layer is reached after the wearing layer that proceeds it has completely worn away, this tread band being characterized in that each wearing layer (C2, C3), distinct from the first wearing layer (C1), comprises a plurality of transverse incisions distributed in the circumferential direction, each transverse incision extending from a channel of the layer in question in a direction which is not circumferential so as to open fully or partially into at least one other circumferentially oriented channel or groove, and do so irrespective of the level of wear of the said other wearing layer.
Dependencies are inferred from the claim text.