Tyre for vehicle wheels having improved tread pattern

a technology for vehicle wheels and treads, which is applied in the direction of vehicle components, transportation and packaging, non-skid devices, etc., can solve the problems of reduced tread stiffness, substantial noise and blockage of mobility, and rapid tread wear ra

Inactive Publication Date: 2010-06-03
PIRELLI TYRE SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these tread patterns reduce the stiffness of the tread and generate substantial noise and block mobility when used on wet or dry roads.
Moreover, the tread wear rate is rapid and therefore these tyres are considered for use only during the snowy winter months.
Additionally, these tyres are not particularly well suited for icy road conditi...

Method used

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  • Tyre for vehicle wheels having improved tread pattern
  • Tyre for vehicle wheels having improved tread pattern
  • Tyre for vehicle wheels having improved tread pattern

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0042]FIG. 1 is a plan view of the tyre tread 1 in accordance with a preferred embodiment of the present invention.

[0043]The tread 1 comprises two internal circumferential grooves 12 and 13, and, according to a preferred embodiment, two external circumferential grooves 11 and 14. The circumferential grooves 12 and 13 separate a tread central region 16 from two tread shoulder regions 15 and 17 located on the left and on the right of the equatorial plane 10, respectively. The circumferential grooves 11 and 14 divide in two portions each shoulder regions 15 and 17, respectively. The circumferential groove 11 divides the left shoulder regions 15 in an external shoulder portion 18 and an internal shoulder portion 19. The circumferential groove 14 divides the right shoulder regions 17 in an internal shoulder portion 20 and an external shoulder portion 21.

[0044]The tread 1 comprises a plurality of asymmetric transverse grooves 25 having a substantially “V” shape, which substantially extend...

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PUM

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Abstract

A tyre for vehicle wheels having a tread pattern includes: a) two circumferential grooves, which define a first and a second shoulder region, and one central region; b) a plurality of asymmetric transverse grooves having a substantially “V” shape, which extend for the whole width of the tread, including an alternate sequence of a first and a second asymmetric transverse groove defining an alternate sequence of a first and a second asymmetric module; and c) a plurality of lateral transverse grooves, which includes one first lateral transverse groove extending for the whole width of the first shoulder region and for a portion of the central region of the first asymmetric modules, and one second lateral transverse groove extending for the whole width of the second shoulder region and for a portion of the central region of the second asymmetric modules.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a tyre for vehicle wheels having an improved tread pattern, more in particular to a winter tyre especially suitable for driving on snow and ice, and having good driving performance on wet and dry road.BACKGROUND OF THE ART[0002]A winter tyre is supposed to ensure good traction when used on snow and ice. However, a winter tyre also needs to provide good driving characteristics when used on dry or wet roads.[0003]Winter or snow tyres have been designed with treads having traction blocks widely spaced by large and deep grooves that allow a good traction and brake on snow. The presence of large and deep traction grooves increases the void-to-rubber ratio of the tread, also simply named void ratio i.e., the amount of open space compared to the amount of rubber in the tread. A low void ratio means more rubber in contact with the road and vice versa. The high void ratio tread pattern is excellent in deep snow because snow is trap...

Claims

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Application Information

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IPC IPC(8): B60C11/03B60C11/04
CPCB60C11/0302B60C11/0306B60C11/042B60C2011/0383B60C11/0304B60C11/1263B60C2011/1209B60C11/13B60C11/03B60C11/04B60C11/0311B60C2011/0313
Inventor COLOMBO, GIANFRANCOMONTESELLO, STEFANOSANGALLI, ROBERTO
Owner PIRELLI TYRE SPA
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