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Improved tread for heavy goods vehicle tyre

A technology for truck tires and treads, which is used in heavy-duty tires, heavy-duty vehicles, tire treads/tread patterns, etc., can solve problems such as reduced resistance to impact fragments, achieve good wear and driving performance, and improve wet road grip. The effect of ground performance

Active Publication Date: 2013-12-18
SOCIETE DE TECH MICHELIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of such elastomers, although accompanied by a marked increase in grip on wet roads, leads to a reduction in the resistance to impact fragments, and especially when striking lateral parts of the tread when driving against obstacles. in this way

Method used

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  • Improved tread for heavy goods vehicle tyre
  • Improved tread for heavy goods vehicle tyre
  • Improved tread for heavy goods vehicle tyre

Examples

Experimental program
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Effect test

Embodiment Construction

[0056] figure 1 A plan view of a tread 10 according to the prior art is shown corresponding to the commercially available tread pattern XZE2 of size 315 / 70R22.5.

[0057] The tread pattern design of this tread is denoted S0; hereinafter, this tread pattern S0 is considered as a reference tread pattern.

[0058] For the tire in question, this reference tread pattern S0 comprises four longitudinal grooves 2 of depth (equal to 15 mm) corresponding to the total thickness E of the tread intended to wear during running. The aforementioned reference tread pattern S0 also includes lateral grooves 3 having a narrow width and a shallow depth (at most equal to 2 mm). The longitudinal grooves delimit ribs 4 .

[0059] In an initial state corresponding to a new and unworn condition of the tread, this reference tread pattern S0 has a total void volume available in the contact block, measured at nominal inflation pressure and load conditions, which is greater and in this case is equal to...

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PUM

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Abstract

Tread for heavy goods vehicle tyre is provided with a total thickness E and a total volume V, the tread is provided with at least one continuous groove (2) and comprises at least two wear layers I, II in the thickness of the tread, wherein each layer has a thickness at most equal to 75% of the total thickness E of the tread; and a plurality of external cavities (21) and a plurality of internal cavities (22) positioned radially and wholly inside the tread surface (11) in the as-new condition, wherein each internal cavity is connected to one external cavity by a connecting duct. The tread has a total groove volume Vc at least equal to 7% and at most equal to 12% of a volume equal to the sum of the total volume V and of the total groove volume, the tread also has an effective groove volume Ve for each wearing layer that is less than the total groove volume Vc, the effective groove volume satisfies the following relationship: 0.4 St < Ve < 0.8 St, in which 0.4 and 0.8 are heights expressed in millimetres and St is the surface area bounded by the external contour of a contact patch of the tread measured under static conditions with customary pressure and loading, and furthermore thd tread is designed in the way that at least the first wearing layer I consists of a rubber compound based on at least one material having a dynamic Tg measured in accordance with standard ASTM D 5992-96, higher than -40 DEG C and containing a predominant proportion of SBR copolymer with a Tg > -65 DEG C.

Description

technical field [0001] The present invention relates to the tread of tires fitted to heavy goods vehicles, and more particularly to the tread pattern of said tread and the rubber compound from which it is made. Background technique [0002] Driving in the rain (wet weather) requires removing water from the contact patch (contact print) of each tire with the road as quickly as possible to ensure that the material from which the tread is made is in contact with the road. For this purpose, grooves are formed on the tread which, by their dimensions (depth and width) remain in communication with the road in the contact blocks and thus allow the drainage of water that is not pushed around the front and sides of the tyre. [0003] A groove may have a cross-section of any shape and may be oriented in any direction with respect to the course it follows on the tread surface. Here, the course followed by a groove on the tread surface refers to the average geometric course followed by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C1/00B60C11/12
CPCB60C1/0016B60C11/0309B60C11/032B60C11/042B60C11/12B60C2200/06B60C11/1281B60C2011/0025B60C11/005B60C11/0323
Inventor J-D·希罗特S·康邦R·奥迪吉耶
Owner SOCIETE DE TECH MICHELIN
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