Sacrificial ribs for improved tire wear

Details Sacrificial ribs for improved tire wear Sacrificial ribs for improved tire wear

B - Operations, Transporting

60

C

B60C 11/01 (2006.01)

Patent

CA 2274554

The present invention provides a tire with a sacrificial rib (38) to protect the main ribs of the tire's tread by delaying the onset of irregular wear and the growth thereof. The improved tire tread comprises a plurality of main ribs (32, 34, 36) formed by grooves (42, 44) extending generally circumferentially around an outer surface of the tire to form a main tread width for contacting the supporting surface. A sacrificial rib (38) is provided for contacting the supporting surface at each lateral side of the main ribs. The sacrificial rib (38) is separated from the main ribs (32, 34, 36) by a narrow shoulder groove (48) having a groove width not greater than about 1.5 millimeter. The sacrificial rib (38) has a surface width in the range of about 2.5 percent to about 12 percent of said tread width. The sacrificial rib (38) has a recess defined by a radial offset from a transverse or lateral profile of the main ribs (32, 34, 36). The offset has a value in the range of about 0.50 millimeter to about 2.0 millimeters when the tire is new. A shape factor is used for defining the shape of the sacrificial rib (38) where the shape factor has a value between about 0.10 and 0.50.

Pneumatique à nervure sacrificielle (38) protégeant les nervures principales (32, 34, 46) de la bande de roulement en retardant l'apparition et le développement d'une usure irrégulière. La bande de roulement améliorée comporte une pluralité de nervures principales formées par des rainures (42, 44) d'extension généralement circulaire autour d'une surface extérieure du pneu, pour constituer une largeur de roulement principale en contact avec la surface d'appui. Une nervure sacrificielle (38) est prévue, pour venir au contact de la surface d'appui sur chaque face latérale des nervures principales. Ladite nervure (38) est séparée des nervures principales (32, 34, 36) par une rainure étroite en épaulement (48), dont la largeur n'excède pas 1,5 millimètre. La nervure sacrificielle (38) a une surface dont la largeur représente entre 2,5 % environ et 12 % environ de la largeur de roulement. Elle (38) a une cavité définie par un décalage radial par rapport à un profil transversal ou latéral des nervures principales (32, 34, 36). Ce décalage est compris entre 0,5 millimètre environ et 2 millimètres environ lorsque le pneu est neuf. Pour définir l'aspect de la nervure sacrificielle (38), on utilise un coefficient d'aspect compris entre 0,10 et 0,50.

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