Tires with improved wear and rolling resistance properties
A technology for tires and treads, which is applied in the direction of rolling resistance optimization, heavy-duty tires, tire parts, etc., and can solve problems such as poor application performance and wear
Active Publication Date: 2020-09-29
MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
[0025] During the tests, the inventors have demonstrated that the presence of some types of longitudinal cuts including concealed voids leads to poorer application performance in terms of wear and to the occurrence of inclinations in the transverse direction compared to similar tires also used without concealed voids. irregular wear patterns
Method used
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Embodiment Construction
[0145] exist figure 1 In , a tire 1 of size 315 / 70R 22.5 has an aspect ratio H / S equal to 0.70, where H is the height of the tire 1 on its mounted rim and S is its maximum axial width. Said tire 1 comprises a radial carcass reinforcement 2 anchored in two beads (not shown in the figures). The carcass reinforcement is formed from a single layer of metal cords. Said carcass reinforcement 2 is hooped by a crown reinforcement 4 formed radially from the inside to the outside by:
[0146] - a first working layer 41 formed of unwrapped 9.28 non-extensible metal cords continuous over the entire width of the ply and oriented at an angle of 24°,
[0147] - a layer 42 of circumferential reinforcing elements formed of 21x23 steel metal cords of the "dual modulus" type,
[0148] - a second working layer 43 formed of unwrapped 9.28 non-extensible metal cords continuous over the entire width of the ply and oriented at an angle equal to 24° and crossing the metal cords of layer 41,
[01...
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Abstract
The invention relates to a tire including a crown reinforcement consisting of at least two working crown layers (41, 43) of reinforcing elements, and at least one layer (42) of circumferential reinforcement elements, a layer C being arranged between the ends of the working crown layers. According to the invention, the tread has at least one longitudinal indentation (8), the depth, measured on a new tire, of said at least one longitudinal indentation not being less than 40% of the thickness of the tread, the ratio of the width measured at the bottom of said longitudinal indentation to the width measured at the surface of the tread of said at least one longitudinal indentation being strictly greater than 2, the modulus of elasticity under stress at 10% elongation of the layer C being greater than 9 MPa, and the maximum value of tan(8), denoted tan(8) max, of the layer C being less than 0.100. FIGURE 2
Description
technical field [0001] The present invention relates to tires with radial carcass reinforcement, and more particularly to tires, for example intended to equip vehicles carrying heavy loads traveling at sustained speeds, such as trucks, tractors, trailers or coaches. Background technique [0002] In heavy tyres, the carcass reinforcement is usually 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 threads or cords parallel in each layer and crossing from one layer to the next so as to form 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 reinforcing elements, advantageously metallic and stretchable and called elastic Reinforcement elements. It may also comprise layers of wires or cords of low elongation at an ang...
Claims
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Patent Timeline
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IPC IPC(8): B60C9/20B60C11/12B60C11/03B60C9/18B60C9/22
CPCB60C9/185B60C9/2006B60C9/22B60C11/0323B60C11/1281B60C2009/1842B60C2009/2064B60C2011/1209B60C2200/06Y02T10/86
Inventor P·热尔韦斯G·戈多B·匡蒂尼特T·日夫科维奇
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN