Tyre, the carcass reinforcement of which is reinforced by a layer of reinforcing elements in the bead region
A technology of reinforcing elements and crown reinforcements, which is applied to the reinforcement layer of pneumatic tires, heavy-duty tires, tire parts, etc., can solve the problems of increasing the risk of internal cracking of polymer blends, and achieve good resistance and Flexibility and high bending resistance, the effect of improving durability
Active Publication Date: 2013-08-21
MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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Problems solved by technology
A solution then is to prepare an upturn of the carcass reinforcement whose ends are further radially further away from the bead line, but at the same time, according to the above, during tire travel, even further radially away from the bead The radially outer ends of the stiffened pieces of wire are shown to experience more stress, increasing the risk of cracking within the surrounding polymer blend
Method used
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[0119] exist figure 1 , a tire 1 of size 315 / 70R22.5 comprises a radial carcass reinforcement 2 anchored in two beads 3 surrounding a bead wire 4 . The carcass reinforcement 2 is formed from a single layer of metal cables. The carcass reinforcement 2 is sheathed by a crown reinforcement 5 , which is itself covered by a tread 6 . The crown reinforcement 5 is formed radially from the inside to the outside as follows:
[0120] - a triangular layer 51 formed over the entire width of the ply by continuous non-clad, non-extensible metal cables 2+7×0.28 oriented at an angle equal to 65°;
[0121] - a first working layer 52 formed over the entire width of the ply by continuous non-clad non-extensible metal cables 0.12+3+8×0.35 oriented at an angle equal to 18°;
[0122] - a second working layer 53 formed over the entire width of the ply by continuous unclad non-extensible metal cables 0.12+3+8×0.35 at an angle equal to 18° to said the metal cable cross orientation of the first wo...
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Abstract
The invention relates to a tyre with a radial carcass reinforcement consisting of at least one layer of reinforcing elements which is anchored in each of the beads by being wrapped around a bead wire, said wrapped-around portion of carcass reinforcement being reinforced with at least one layer of reinforcing elements or stiffener, the radially outer end of which is radially on the outside of the end of the wrapped-around portion. According to the invention, the reinforcing elements of at least one stiffener are unwrapped metal chords with saturated layers which on the test known as the permeability test return a flowrate less than 20 cm3 / min and the distance between the radially outer end of the stiffener and the end of the wrapped-around portion of carcass reinforcement is less than 5 mm.
Description
technical field [0001] The present invention relates to a tire with radial carcass reinforcement, more particularly to a tire intended to equip heavy goods vehicles traveling at sustained speeds, such as vans, tractors, trailers or buses. Background technique [0002] Typically, in heavy goods vehicle tyres, the carcass reinforcement is anchored on either side in the bead area and is radially covered by a crown reinforcement consisting of at least two superimposed layers of The layers are formed by cords or cables parallel within each layer and crossed from one layer to the next forming an angle with the circumferential direction of between 10° and 45°. Said working layer forming the working reinforcement may further be covered by at least one layer called protective layer formed by advantageously malleable metallic reinforcing elements called elastic elements. It may also comprise layers of low ductility metal cords or cables forming an angle between 45° and 90° with the c...
Claims
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IPC IPC(8): B60C15/06D07B1/16
CPCD07B1/062D07B1/0626D07B1/0633D07B2201/2046D07B2501/2046B60C2200/06B60C9/0007B60C15/0628B60C2015/0621B60C2015/009B60C2015/0685B60C2015/065B60C9/02
Inventor G·萨拉兹A·德乔治A·多明戈B·格里西尼
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN