Abstract:
La présente invention concerne un pneumatique pour véhicule à usage agricole, et plus particulièrement sa bande de roulement, et vise à améliorer le compromis entre la résistance à l'usure, plus particulièrement localisée au voisinage des arêtes de fuite des barrettes, et la résistance aux agressions mécaniques, plus particulièrement localisées au niveau des faces d'attaques des barrettes. Selon l'invention, chaque barrette (3) comprend une portion de raccordement (31), s'étendant perpendiculairement à la surface de raccordement (9) de la face d'attaque (7) avec la surface de fond (5) sur une épaisseur E 1 au moins égale à 0.05 fois l'épaisseur circonférentielle de barrette E, la portion de raccordement (31) étant constituée par un premier mélange élastomérique et une portion de barrette (32), constituée par la barrette (3) et excluant la portion de raccordement (31), comprend un deuxième mélange élastomérique différent du premier mélange élastomérique.
Abstract:
A tyre for a vehicle wheel, the tyre having a tread portion intended to engage the ground and being so constructed and arranged that when a wheel carrying the tyre is rotated in a first direction it provides a performance suitable for summer conditions and that when a wheel carrying the tyre is rotated in a second direction opposite the first direction it provides a performance suitable for winter conditions.
Abstract:
Tire (10) comprising a tread (11) provided with a base surface (14) and with a plurality of ribs (12), each rib (12) being provided with a front wall and a rear wall, wherein, on the front wall of the rib (12), under a top portion (13) of the front wall, a shaped profile (15) is present, with a base in the portion of the tread (11) comprised between the front wall of the rib (12) and the adjacent rib, height equal to a portion of the overall height of the front wall of the rib (12) and a length that extends in the transverse direction with respect to the height of the rib (12), wherein the shaped profile (15) has a section that defines at least one flat surface (17) of the shaped profile (15) which is parallel, or inclined at an angle a up to 20°, with respect to the surface of the head (16) of the rib and which is joint to said top portion (13) of the front wall of the rib (12) by means of a connecting surface (18); the shaped profile (15) further comprises at least one sharp edge (19) and a front wall (23) which is joint to said base surface (14) of the tread (11) by means of a connecting surface (21).
Abstract:
A tire tread having features that improve thermal wear performance is provided. A tread block is provided with an aperture. The aperture is positioned and sized in a manner that reduces stresses and/or strains in the tread block so as to reduce thermal wear. Certain variations in the depth and shape of the aperture are provided. Such tread feature can provide for a tire capable of operating at higher speeds for a given load.