Pneumatic tyre

A technology of pneumatic tires and tires, applied in tire parts, tire tread/tread pattern, transportation and packaging, etc., can solve the problems of increasing tire noise, weakening dry road performance, etc. The effect of uniform wear and low noise values

Active Publication Date: 2010-12-01
PIRELLI TYRE SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The applicant has noticed that a large number of transverse grooves of significant width improves especially the traction on wet roads and ensures a good compliance of the block itself, but excessive use of this large number of transverse grooves of significant width weakens the performance on dry roads and increased tire noise

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0068] figure 1 , 2 , 2b shows a tire 1 according to the invention with a first embodiment of a tread 2 .

[0069] The structure of the tire 1 is of conventional type and comprises: a carcass; a tread band placed on the crown of the carcass; a pair of axially opposite sidewalls terminating in reinforcement with bead cores and corresponding bead fillers bead. The tire preferably also includes a belt structure interposed between the carcass and the tread band. The carcass is reinforced with one or more carcass plies anchored to the bead cores, while the belt structure comprises two belt strips radially overlapping each other. The straps are formed with segments of tape that are bonded to metal cords that in each strap are parallel to each other and cross (preferably symmetrically with respect to the equatorial plane) the cords of adjacent straps. way tilted). Preferably, the belt structure also comprises, at a radially outermost position, a third strap provided with cords o...

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PUM

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Abstract

A pneumatic tyre (1) for car having a tread (2) comprising a central portion (Ll) disposed astride an equatorial plane (7) and two shoulder portions (8, 12). The central portion (Ll) is separated from the tread shoulder portions (8, 12) by two circumferential grooves (3, 6); at least one circumferential row (9) included between a first and a second circumferential groove (3, 4) is present in the central portion (Ll). The tread (2) has a hollow / solid ratio lower than 0.28. The circumferential row (9) comprises transverse grooves (16) extending over at least 80% of the width of the circumferential row (9). Each transverse groove (16) comprises a median line having at least one first rectilinear stretch (106; 107) and one curvilinear stretch (108). The transverse grooves (16) have a smaller width than that of the circumferential grooves (3, 4).

Description

technical field [0001] The present invention relates to a pneumatic tire for automobiles. Specifically, it relates to a pneumatic tire for high-performance cars and SUVs (Sport Utility Vehicles). Background technique [0002] For tires of this class, in addition to satisfactory anti-wear properties, optimum characteristics in terms of traction and braking and handling on dry and wet roads are generally required. [0003] Known are tires for motor vehicles having a tread provided with blocks delimited by circumferential grooves and transverse grooves extending in a substantially longitudinal direction , the transverse grooves extend in a substantially axial direction. The blocks resulting from the interleaving of these grooves are shaped according to the different configurations suitably studied and are arranged along side-by-side circumferential rows, each said side-by-side circumferential row being arranged between two consecutive circumferential grooves. [0004] Circum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/03B60C11/11
CPCB60C11/033B60C11/0304B60C11/0309B60C2011/0369B60C11/1369B60C11/1263B60C11/0306B60C2011/0372B60C11/03B60C11/11
Inventor R·伯尔佐尼R·圣加利D·斯卡尔克里蒂
Owner PIRELLI TYRE SPA
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