Tyre comprising tread

Abstract

The invention relates to a tyre comprising an oriented tread (10), said tread comprising a central axis (12) and two edges (14A, 14B) located on either side of said central axis (12) and defining a tread width W greater than or equal to 140 mm, said tread (10) comprising a plurality of patterns (13) successive to one another in the circumferential direction, each pattern having a pitch P, the pattern (13) defines a plurality of inclined grooves (16A, 16B), each inclined groove extending from one of the edges (14A, 14B) of the tread to the central axis (12). In a central portion of the tread centered on the central axis (12) and having a width corresponding to 80% of the width W of said tread, all or part of the plurality of inclined grooves (16A, 16B) have an aspect ratio E of between 0.85 and 1.5, preferably between 0.87 and 1.1, the aspect ratio corresponding to the ratio of the projected length Lpx of the inclined groove in the circumferential direction (X) to the half width of the center portion of the tread (10) satisfies formula (I). All or part of the pattern comprises at least one sipe (18; 181, 182, 183, 184, 185, 186), the sipe density SD in all or part of these patterns being between 10 mm-1 and 70 mm-1, said sipe density SD corresponding to the ratio of the sum of the projected lengths lpyi of the sipes in the axial direction (Y) to the product of the pitch P of the pattern and the width W of the tread, as a whole multiplied by 1000, satisfying formula (II) where n is the number of sipes in the pattern.

Description

technical field [0001] The invention relates to a tire for motor vehicles, the tread of which comprises a plurality of inclined grooves with a high aspect ratio. The invention applies more particularly to tires intended to be fitted to passenger vehicles or vans. Background technique [0002] In a known manner, tires intended to be fitted to motor vehicles have a tread. This tread comprises a tread surface and two edges delimiting said tread surface. The tread surface corresponds to all the points at which the tread comes into contact with the ground when the tire (inflated to its reference pressure and compressed under a reference load) runs on the road. A reference inflation pressure and a reference load are defined in the tire use conditions specified in particular by the E.T.R.T.O. standard. The tread surface of the tread includes voids formed by various grooves, such as inclined grooves. The inclined grooves form channels intended to remove water towards the edge of...

AI Technical Summary

Problems solved by technology

However, the blocks of material delimited by these inclined grooves may suffer from a higher degree of wear due to their lower lateral stiffness

Furthermore, behavior on dry ground is also compromised by the high aspect ratio of the sloped trenches

Finally, on snow, this tire has limited grip

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