Pneumatic tire crown reinforcement consisting of two working crown layers and one layer of circumferential reinforcing elements
A technology of crown reinforcement and working crown layer, which is applied to the reinforcement layer of pneumatic tires, tire parts, tire tread/tread pattern, etc., and can solve the problems of reduced durability and other issues
Active Publication Date: 2022-07-15
MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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Problems solved by technology
[0021] However, the inventors have demonstrated that the durability of such tires may be reduced due to the light weight of the tyre, especially of the crown reinforcement, when running on very specific ground comprising many small stones
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[0090] In the figures, the aspect ratio H / L of a tire 1 of size 315 / 70R 22.5 is equal to 0.70, H being the height of the tire 1 when the tire 1 is mounted on a rim, and L the maximum axial width of the tire 1 . Said tire 1 comprises radial carcass reinforcements 2 fixed in two beads (not shown in the figures). The carcass reinforcement 2 is formed of a single layer of metal cords. It also includes tread 5 .
[0091] In the drawings, according to the invention, said carcass reinforcement 2 is covered by a crown reinforcement 4 formed radially from the inside to the outside by the following layers:
[0092] - a first working layer 41 formed by metal cords oriented at an angle α1 equal to 19°,
[0093] - A layer 43 of circumferential reinforcing elements, formed of steel metal cords of type 21x23.
[0094] - a second working layer 42 formed by metal cords oriented at an angle α2 equal to 38° and intersecting with the metal cords of the first working layer 41 , the cords of eac...
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Abstract
The invention relates to a pneumatic tire comprising a crown reinforcement (4) comprising two working crown layers (41, 42) of reinforcing elements and at least one layer (43) of circumferential reinforcing elements. According to the invention, the two working crown layers (41, 42) and the at least one circumferential reinforcing element layer (43) are the only layers forming the crown reinforcement (4) over at least 80% of the width of the tread (5), the absolute value of the difference between the angle [alpha] 2 and the absolute value of [alpha] 1 being greater than 4 DEG, the absolute value of [alpha] 2 being greater than the absolute value of [alpha] 1, the average angle [alpha] satisfying the relationship: 14 + 131 * exp (-L / 100) lt; [alpha] [lt]; 28 + 110 * exp (-L / 100), and the ratio (R = (dC-dE) / dS) is 0.05 lt; rlt; 3.
Description
technical field [0001] The present invention relates to tires having radial carcass reinforcements, and more particularly to tires intended to be fitted to vehicles carrying heavier loads, such as trucks, tractors, trailers or buses. Background technique [0002] In heavy duty tires, the carcass reinforcement is usually fixed in the bead area on both sides and is radially covered by a crown reinforcement consisting of at least two superimposed layers formed of threads or cords , the threads or cords are parallel in each layer and cross from one layer to the next and form an angle between 10° and 45° with the circumferential direction. Said working layer forming the working reinforcement can also be covered with at least one layer called a protective layer formed by reinforcing elements called elastic reinforcing elements, advantageously metallic and stretchable of. The crown reinforcement may also comprise a layer of metal wires or metal cords forming an angle between 45° ...
Claims
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IPC IPC(8): B60C9/22B60C11/00B60C9/28B60C9/20
CPCB60C11/0083B60C2009/2012B60C9/22B60C2011/0033B60C2009/283B60C9/28B60C2009/2276B60C2009/209B60C2009/208B60C2009/2261B60C2009/2228B60C2009/2016B60C2009/2019B60C2200/06
Inventor O·富尼耶H·雷哈卜G·萨利兹P·达耶
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN