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Tires for heavy duty wheels

A technology of tires and wheels, which is applied to heavy tires, heavy vehicles, tire parts, etc., and can solve problems affecting comfort

Active Publication Date: 2019-01-01
PIRELLI TYRE SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cord A has high stiffness only at high elongation values ​​(greater than 1.5%), thereby ensuring good characteristics of comfort, but cords B and C are at low elongation values ​​(starting from values ​​less than 0.5%) ) is also highly rigid, which negatively affects comfort

Method used

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  • Tires for heavy duty wheels
  • Tires for heavy duty wheels
  • Tires for heavy duty wheels

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0110] For simplicity, image 3 Only a part of a tire 100 according to the invention is shown, the remainder not shown being substantially identical and arranged symmetrically with respect to the equatorial plane X-X of the tyre. In the various figures, the same reference numerals refer to the same or functionally equivalent parts.

[0111] image 3 Tires are tires for light or heavy duty wheels such as vans, buses, trailers, trucks, vans, and are generally used for vehicles where the tires are subjected to high loads. Preferably, such a tire 100 is configured to fit onto a rim having a diameter greater than or equal to 17.5".

[0112] The tire 100 comprises a carcass structure 100a comprising at least one carcass ply 101 whose opposite side edges are associated with respective bead structures 111 comprising bead cores 108 and at least one bead filler 107 . The association between said at least one carcass ply 101 and said bead structure 111 is generally achieved by invert...

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Abstract

A tire for a heavy-duty wheel comprises a carcass structure, a belt structure arranged in a radially outer position with respect to the carcass structure, a tread band arranged in a radially outer position with respect to said belt structure. The belt structure includes a plurality of reinforcing cords, wherein each cord includes a core made of a non-metallic material, and a plurality of metal helically wound substantially parallel to each other and around said core at a predetermined winding pitch. wire. The metal wires are arranged around said core such that, in any cross-section of the cord, the metal wires are positioned at only an angular portion surrounding the imaginary circumference of the core. The elongation of a cord when subjected to a variable load between 10% and 40% of its ultimate tensile strength varies according to a curve having a linear correlation coefficient of less than about 0.990 in the load-elongation diagram, the point of which is Interpolated by lines with a view factor less than about 30. Said reinforcing cords can be arranged in the stone protection layer and / or the main belt layer of the belt structure.

Description

technical field [0001] The present invention relates to tires for the wheels of heavy loads such as trucks, buses, trailers or similar vehicles, and generally for vehicles where the tires are subject to high loads. However, the invention can also be applied to light truck wheels such as vans or similar vehicles. Background technique [0002] Documents WO 2012 / 017399 and WO 2012 / 164442 of the same applicant describe tires for heavy-duty wheels. [0003] Other tires for heavy-duty wheels are described in documents US 7,594,380 and US 8,166,741. Specifically, these documents describe tires whose belt structure includes reinforcing cords each having a core made of non-metallic material and a plurality of metal wires single or twisted in a Together the strands of metal wire are formed helically wound around the core. These reinforcing cords comprising non-metallic and metallic wires are also referred to by the term "hybrid". [0004] "Hybrid" cords are also used in tires for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C9/00
CPCB60C9/005B60C9/2003B60C2009/2096B60C2009/209B60C2009/2093B60C9/00B60C9/0007B60C9/0028B60C9/0042B60C9/02B60C9/2009B60C9/22B60C11/00B60C2009/0035B60C2009/0071B60C2009/0085B60C2009/2074B60C2009/2077B60C2009/2219B60C2200/06
Inventor G·L·达吉尼S·特雷索尔迪O·巴拉比奥
Owner PIRELLI TYRE SPA