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A technology of radial tires and reinforcements, applied in the direction of tire sidewalls, tire parts, reinforcement layers of pneumatic tires, etc.
Inactive Publication Date: 2004-07-14
MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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Since the solution requires the circumferential reinforcement to be positioned on an already formed tire semi-finished product, it creates many processing problems
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[0027] figure 1 A first variant of the group G1 of three straps B1 , B2 and B3 is shown, having substantially equal widths L1 , L2 and L3 , forming a protective layer of secondary reinforcements to reinforce the sidewalls of the tyre. In the case described, the widths L1 , L2 and L3 are greater than one third of the entire width Lt of the group G1 . Here, group G1 is shown on a cylindrical building head, not yet incorporated into the tire.
[0028] Each of the straps B1, B2 and B3 of the group comprises a plurality of steel cables 11, 12 and 13 arranged parallel to each other over the entire group G1 and forming, in the illustrated embodiment, an angle substantially equal to 45°. Inclination angles α1, α2 and α3 (the angles are measured with respect to the circumferential direction indicated by arrow X in the figure). in its radial direction (in figure 1 Corresponding to the direction in the plane of the figure and perpendicular to the direction indicated by X), the strap B...
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PUM
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Abstract
The invention concerns a radial tyre (1) comprising a crown, two beads (4) extended by sidewalls (2) including a radial carcass reinforcement (5), said carcass reinforcement (5) extending in the crown and anchored in each bead (4) to least one element (41) inextensible in the circumferential direction, said tyre (1) comprising, in at least one sidewall (2), an additional reinforcement ply (6) made of gum and reinforcing elements inclined relative to the circumferential direction. The invention is characterised in that, viewed in meridian cross-section: the additional reinforcement ply (6) comprises at least an assembly (61, 62) of at least two strips (61A, 61B, 61C, 61D, 62A, 62B, 62C, 62D) extending in the circumferential direction, each strip (61A, 61B, 61C, 61D, 62A, 62B, 62C, 62D), of width Li substantially equal or greater than the total width Lt of the reinforcement divided by the total number of strips in the assembly concerned, is formed of gum reinforced by a plurality of cords or yarns sloping at an angle alpha ranging between 30 DEG and 90 DEG , in one single common assembly, each circumferential strip is partly superimposed with a neighbouring strip.
Description
technical field [0001] The present invention relates to tire reinforcements, in particular tire reinforcements with radial carcass reinforcements, i.e. carcass reinforcements, the reinforcing elements of which lie in a meridian plane including the axis of rotation, or even form a small angle with said meridian plane. angle. It can be applied to all types of tires but is especially suitable for tires designed for off-road hilly or rocky roads, or more generally rough and corroded roads. Background technique [0002] It is known from the prior art that a radial tire has an area called a bead intended to cooperate with the rim on which the rim is mounted and the seat ring, said bead comprising a reinforcement structure in the circumferential direction, the carcass reinforcement being fixed on this. A crown reinforcement is arranged radially outside the carcass reinforcement. The crown reinforcement includes at least two ply layers. The role of the crown reinforcement among ot...
Claims
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Application Information
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