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tires for motor vehicles

A technology for motor vehicles and tires, applied in the direction of motor vehicles, motorcycle tires, wheels, etc.

Inactive Publication Date: 2011-11-30
PIRELLI TYRE SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] The applicant has found that the presence of limited but deep depressions, especially in the central part of the tread band, can improve the performance of a new tire during the first few kilometers of use, ie after the tire has worn out due to structural and compounding problems. Characteristics of a stage that has not yet fully realized its potential

Method used

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Embodiment Construction

[0069] exist figure 1 In , the motor vehicle wheel tire according to the invention is indicated by 1 as a whole. In particular, the tire is a tire intended for use on the rear wheels of a motor vehicle of the “sport touring” type.

[0070] An equatorial plane X-X and an axis of rotation Z are defined in the tire 1 . The circumferential direction is also defined (in figure 2 Indicated by the arrow R oriented along the direction of rotation of the tire) and the axial direction perpendicular to the equatorial plane X-X.

[0071] The tire 1 comprises a carcass structure 2 having a central crown portion 16 comprising at least one carcass ply 3 , as will be described in more detail below.

[0072] The carcass structure 2 is preferably covered on its inner walls with a lining mainly composed of a layer of airtight elastic material suitable to ensure the sealing of the carcass itself after inflation.

[0073] The carcass ply 3 is engaged at its axially opposite side edges 3a with...

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Abstract

A tyre (1) for motor vehicles, having a tread band (8) extending around a rotation axis (Z) and comprising an annular central portion (A) astride of an equatorial plane (X-X) of the tyre, two annular shoulder portions (B) arranged on axially opposite sides with respect to the annular central portion (A) and two annular side portions (C) each arranged between the annular central portion (A) and a respective annular shoulder portion (B), the tread band (8) having at least one module (Ti; T2) replicated along a circumferential direction of the tyre and comprising: at least one plurality of primary grooves inclined with respect to the equatorial plane (X-X) and arranged at least on the annular portions (B), (C); at least one plurality of secondary recesses arranged mainly on the annular central portion (A) and on at least one annular side portion (C); wherein a substantial disappearance of the secondary recesses determines a difference in the empty / solid ratio on the annular central (A) and side (C) portions between a new tyre and a tyre that has traveled at least 2000 km greater than 1.7%.

Description

technical field [0001] The present invention relates to a tire for a motor vehicle, ie a tire having a high transverse curvature in order to provide a surface which is in sufficient contact with the road surface when the motor vehicle is banked and turned. Background technique [0002] Preferably, the tires to which the invention relates are intended for use in motor vehicles of the "sport touring" type, ie intended for use on motorways and streets in cities and / or outside cities, in A sporty motor vehicle that delivers high performance in terms of power, comfort and mileage, wet or dry. [0003] Motor vehicles of the "sport touring" type typically have large piston displacements (equal to or greater than 800 cm 3 ) and / or high power (equal to or greater than 110HP). However, there are already piston displacements up to 1250cm on the market 3 and motor vehicles with a power equal to 150HP. [0004] As is well known, tires for such motor vehicles must ensure performance o...

Claims

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Application Information

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IPC IPC(8): B60C11/04B60C11/03
CPCB60C11/0302B60C11/0306B60C2011/0381B60C11/032B60C2200/10Y10T152/10027
Inventor P·米萨尼M·马里亚尼A·斯基亚沃林
Owner PIRELLI TYRE SPA
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