Tires in which the carcass reinforcement in the bead area is reinforced by layers of reinforcing elements
A technology of reinforcing elements and crown reinforcements, which is applied to the reinforcement layers 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, improved Effects of durability, good flexibility and high bending resistance
Active Publication Date: 2016-09-28
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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Embodiment Construction
[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 tire with a radial carcass reinforcement consisting of at least one layer of reinforcing elements anchored in each bead by wrapping around a bead wire, said tire The wraparound portion of the body reinforcement is reinforced by at least one reinforcing element layer or stiffener having a radially outer end radially outward of the end of the wraparound portion. According to the invention, at least one reinforcing element of the stiffener is an unclad metal cable with a saturated layer, said metal cable having a flow rate of less than 20 cm3 / min in the so-called permeability test, and the radially outer diameter of the stiffener The distance between the end and the end of the wraparound portion of the 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