Pneumatic tire tread

Details Pneumatic tire tread Pneumatic tire tread

B - Operations, Transporting

60

C

B60C 11/12 (2006.01) B29D 30/06 (2006.01)

Patent

CA 2428572

The invention concerns a running tread (1) provided with a plurality of cut- outs (5, 6, 71, 72, 73, 81, 82, 83) with essentially transverse orientation and characterised in that: when new, some of the transverse cut-outs (5, 6) form on the running surface recessed zones of average width Lt not less than 2 mm and a maximum depth Pt not more than 80 % of the thickness Pb of the tread to be worn, the other transverse cut-outs (71, 72, 73, 81, 82, 83) forming on the same running surface notches (71', 72', 73', 81', 82', 83') of average width Li less than 2 mm and of depth Pi not more than Pt; a plurality of notches (71', 72', 73', 81', 82', 83') extending through recessed zones (71'', 72'', 73'', 81'', 82'', 83'') such that after the tread has been homogeneously worn the volume V1 of the recessed zones (71'', 72'', 73'', 81'', 82'', 83'') emerging onto the new running surface ranges between 50 % and 150 % of the volume V0 formed by the recessed zones when new. The moulding element comprises thick parts and thin parts.

Bande de roulement (1) pourvue d'une pluralité de découpures (5, 6, 71, 72, 73, 81, 82, 83) d'orientation essentiellement transversale et caractérisée en ce que: - à l'état neuf, certaines des découpures tranversales (5, 6) forment sur la surface de roulement des zones en creux de largeur moyenne Lt supérieure ou égale à 2 mm et de profondeur maximale Pt au plus égale à 80% de l'épaisseur Pb de bande à user, les autres découpures transversales (71, 72, 73, 81, 82, 83) formant sur la même surface de roulement des incisions (71', 72', 73', 81', 82', 83') de largeur moyenne Li inférieure à 2 mm et de profondeur Pi au plus égale à Pt; - une pluralité des incisions (71', 72', 73', 81', 82', 83') se prolongeant par des zones en creux (71", 72", 73", 81", 82", 83") de telle sorte qu'après une usure homogène de la bande de roulement le volume V1 des zones en creux (71", 72", 73", 81", 82", 83") débouchant sur la nouvelle surface de roulement soit compris entre 50% et 150% du volume V0 formé par les zones en creux à l'état neuf. Elément moulant comportant des parties épaisses et des parties minces.

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