# US 2024/0198730 A1 · High-performance tyre

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- Number: US 2024/0198730 A1
- Document ID: US20240198730A1
- Status: Published application
- Kind: A1
- Application number: 18/552,387
- Filed: 2022-03-24
- Published: 2024-06-20
- Earliest claimed: 2021-04-01
- Assignees: Pirelli Tyre S.p.A.
- Applicants: Pirelli Tyre S.p.A.
- Inventors: Roberto BOLZONI; Diego Ettore SPEZIARI
- Web page: https://patentgrep.com/patent/US20240198730A1

## CPC

- B60C 11/0304: {Asymmetric patterns}
- B60C 11/0302: {directional pattern, i.e. with main rolling direction}
- B60C 11/033: {by the void or net-to-gross ratios of the patterns}
- B60C 2011/0341: {Circumferential grooves}
- B60C 2011/0348: {Narrow grooves, i.e. having a width of less than 4 mm}
- B60C 2011/0353: {characterised by width}
- B60C 2011/036: {Narrow grooves, i.e. having a width of less than 3 mm}
- B60C 2011/0365: {characterised by width}
- B60C 2011/0372: {with particular inclination angles}
- B60C 2011/0383: {at the centre of the tread}
- B60C 2011/0388: {provided at the equatorial plane}
- B60C 2200/04: for road vehicles, e.g. passenger cars
- B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES

## Abstract

A car tyre (100), in particular a high or ultra high performance car tyre also suitable for use on track, is described; the tread band (1) of the tyre has a central region (L1), separated from two shoulder regions (L2, L3), respectively an outer shoulder region (L2) and inner shoulder region (L3); the outer shoulder region (L2) has a width greater than the width of the inner shoulder region (L3); the outer and inner shoulder regions are provided with relatively large grooves (5,6); in the outer shoulder region these grooves (5) alternate with narrower grooves (7), which reduce the stiffness of this tyre region only to a limited extend; the central region (L1) of the tyre, instead, was designed so as to have a low void-to-rubber ratio of equal to or smaller than 0.09.

## Claims

### Claim at position 1

1-35. (canceled)

### Claim 36

A car tyre having a tread band comprising a central region, extending across an equatorial plane (X-X) of the tyre, an outer shoulder region located towards an outer side of the tyre and an inner shoulder region located towards an inner side of the tyre; the tread band further comprising:
a first circumferential groove axially delimiting the outer shoulder region relative to the central region and a second circumferential groove axially delimiting the inner shoulder region relative to the central region;
the outer shoulder region having a width greater than a width of the inner shoulder region; and
the outer shoulder region and the inner shoulder region comprise a plurality of first transverse grooves having a first end located substantially at the respective edge of the tread band, having a maximum width greater than, or equal to, 3 mm and an extension equal to at least 50% of the width of the shoulder region where the plurality of first transverse grooves are located;
wherein
the outer shoulder region comprises a plurality of second transverse grooves extending from the first circumferential groove;
the second transverse grooves have a width smaller than the first transverse grooves and a counter-inclined course relative to the first transverse grooves;
the central region comprising a first and a second circumferential rib separated by a third circumferential groove, and
the first and second circumferential ribs having a void-to-rubber ratio equal to, or smaller than, 0.09.

### Claim 37 (depends on 36)

The tyre according to claim 36, wherein the first circumferential rib comprises a plurality of third transverse grooves extending from the first circumferential groove to be located along the extension direction of the second transverse grooves.

### Claim 38 (depends on 36)

The tyre according to claim 36, wherein the third transverse grooves have an extension equal to, or smaller than, 80% of a width of the first circumferential rib.

### Claim 39 (depends on 36)

The tyre according to claim 36, wherein the second circumferential rib comprises a plurality of fourth transverse grooves.

### Claim 40 (depends on 39)

The tyre according to claim 39, wherein the fourth transverse grooves have an extension equal to, or greater than, 50% of a width of the second circumferential rib.

### Claim 41 (depends on 36)

The tyre according to claim 36, wherein the second transverse grooves are inclined relative to a direction parallel to the equatorial plane (X-X) to form an angle (α′) greater than 75°.

### Claim 42 (depends on 36)

The tyre according to claim 36, wherein the second transverse grooves have an extension equal to, or smaller than, 90% of the width of the outer shoulder region.

### Claim 43 (depends on 36)

The tyre according to claim 36, wherein the second transverse grooves do not have intersection points with the first transverse grooves.

### Claim 44 (depends on 36)

The tyre according to claim 36, wherein in the outer shoulder region, the second transverse grooves and the first transverse grooves have a segment of their extension in a common circumferential annular portion having a width equal to at least ⅕ of the width of the outer shoulder region.

### Claim 45 (depends on 36)

The tyre according to claim 36, wherein in the outer shoulder region, the second transverse grooves and the first transverse grooves have a segment of their extension in a common circumferential annular portion having a width equal to at most ⅖ of the width of the outer shoulder region.

### Claim 46 (depends on 38)

The tyre according to claim 38, wherein the third transverse grooves have an extension equal to, or smaller than, 50% of a width of the first circumferential rib.

### Claim 47 (depends on 39)

The tyre according to claim 39, wherein the fourth transverse grooves have at least one first segment and at least one second segment consecutively located relative to the first segment, and the second segment counter-inclined relative to the first segment.

### Claim 48 (depends on 47)

The tyre according to claim 47, wherein the first segment extends from the third circumferential groove.

### Claim 49 (depends on 47)

The tyre according to claim 47, wherein the first segment extends to be located along an extension direction of the second transverse grooves.

### Claim 50 (depends on 47)

The tyre according to claim 47, wherein the second segment extends over at least 50% of the total extension of the fourth transverse grooves.

### Claim 51 (depends on 47)

The tyre according to claim 47, wherein the first segment extends over at most 20% of the total extension of the fourth transverse grooves.

### Claim 52 (depends on 47)

The tyre according to claim 47, wherein the second segment has a first portion having a width equal to, or greater than, 3 mm.

### Claim 53 (depends on 52)

The tyre according to claim 52, wherein the second segment has a second portion having a width smaller than the width of the first portion.

### Claim 54 (depends on 36)

The tyre according to claim 36, wherein the outer shoulder region comprises a plurality of longitudinal grooves, having a substantially circumferential course.

### Claim 55 (depends on 54)

The tyre according to claim 54, wherein the longitudinal grooves intersect at least some of the first transverse grooves.

### Claim 56 (depends on 37)

The tyre according to claim 37, wherein the void-to-rubber ratio of the first circumferential rib results only from the third transverse grooves.

### Claim 57 (depends on 36)

The tyre according to claim 36, wherein the first circumferential rib comprises a plurality of fifth transverse grooves.

### Claim 58 (depends on 57)

The tyre according to claim 57, wherein the fifth transverse grooves have an extension equal to, or smaller than, 50% of a width of the first circumferential rib.

### Claim 59 (depends on 57)

The tyre according to claim 57, wherein the fifth transverse grooves have a width greater than the third transverse grooves.

### Claim 60 (depends on 36)

The tyre according to claim 36, wherein the central region comprises a third circumferential rib separated from the first circumferential rib by a fourth circumferential groove.

### Claim 61 (depends on 60)

The tyre according to claim 60, wherein the third circumferential rib has a void-to-rubber ratio equal to, or smaller than, 0.09.

### Claim 62 (depends on 60)

The tyre according to claim 60, wherein the third circumferential rib comprises a plurality of seventh transverse grooves.

### Claim 63 (depends on 62)

The tyre according to claim 62, wherein the seventh transverse grooves have an extension equal to, or greater than, 60% of a width of the third circumferential rib.

### Claim 64 (depends on 62)

The tyre according to claim 62, wherein the seventh transverse grooves extend from the first circumferential groove to be located along the extension direction of the second transverse grooves.

### Claim 65 (depends on 36)

The tyre according to claim 36, wherein the first transverse grooves have substantially straight course.

### Claim 66 (depends on 36)

The tyre according to claim 36, wherein the second transverse grooves have a substantially straight course.

### Claim 67 (depends on 36)

The tyre according to claim 36, wherein the void-to-rubber ratio of the inner shoulder region results only form the first transverse grooves.

### Claim 68 (depends on 36)

The tyre according to claim 36, wherein in the inner shoulder region, the first transverse grooves have an extension equal to, or smaller than, 90% of the width of the inner shoulder region.

### Claim 69 (depends on 36)

The tyre according to claim 36, wherein the number of the first transverse grooves of the outer shoulder region is lower than the number of the first transverse grooves of the inner shoulder region.

### Claim 70 (depends on 69)

The tyre according to claim 69, wherein the number of first transverse grooves of the inner shoulder region is about twice the number of first transverse grooves of the outer shoulder region.