Tires with improved wear and rolling resistance properties
A tire and tread technology that is used in rolling resistance optimization, heavy-duty tires, tire parts, etc., and can solve problems such as durability impact and increase in kilometers
Active Publication Date: 2020-10-20
MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
The combination of conditions in which such tires are used for driving undoubtedly leads to an increase in the number of kilometers traveled due to the reduced wear on the tire; but on the other hand, the durability of the tire and especially the crown reinforcement is adversely affected
Method used
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Embodiment Construction
[0137] For ease of understanding, the figures are not shown to scale. figure 1 Only a half-view of a tire is shown, which extends symmetrically with respect to an axis XX' representing its circumferential median plane or equatorial plane.
[0138] 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:
[0139] - 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°,
[0140] - a layer 42 of circumferential reinforcing elements formed of 21x23 steel metal cords of t...
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Abstract
The invention relates to a tire comprising a crown reinforcement formed by at least two working crown layers (41, 43) of reinforcing elements and at least one layer (42) of circumferential reinforcing elements. According to the invention, the tread comprises at least one oblique cut (7), the depth of which, measured on a brand new tire, is greater than or equal to 40% of the thickness of the tread, said at least one oblique cut at its The ratio of the width measured at the bottom to the width measured at the tread surface thereof is greater than 1.2. At least one skin layer of at least one working crown layer has a tensile modulus of elasticity at 10% elongation of less than 8.5 MPa, and at least one skin layer of at least one working crown layer has a tan(δ) expressed in tan(δ)max The maximum value of is less than 0.100.
Description
technical field [0001] The present invention relates to tires with radial carcass reinforcement, and more particularly to tires intended to fit vehicles carrying heavy loads and traveling at sustained speeds, such as trucks, tractors, trailers or passenger vehicles. 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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IPC IPC(8): B60C9/20B60C11/12B60C11/03B60C9/22
CPCB60C9/2006B60C2200/06B60C2011/1209B60C2009/2064B60C11/1281B60C11/0323B60C9/22Y02T10/86
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