TIRE WITH INSERT

Abstract

A tire comprises sidewalls (2), a crown region (3) provided with a tread (4), and a reinforcing structure (5) extending between the sidewalls (2) and passing via the crown region (3). At least one portion of the region of the tire that is axially inside the reinforcing structure (5) comprises an insert (6) comprising a first elastomer composition serving as a matrix, within which a second elastomer composition originating from recycled tires is distributed substantially uniformly, the proportion of said second elastomer composition being greater than or equal to 40%.

Claims

1.-12. (canceled)

13. A tire comprising sidewalls, a crown region provided with a tread, with a reinforcing structure extending between the sidewalls and passing via the crown region, the sidewalls, the crown region and the reinforcing structure forming a bearing structure delimited internally by a tire inner wall, wherein at least a portion of the region of the tire located between the reinforcing structure and the tire inner wall comprises an insert structurally forming part of the bearing structure and comprising a first elastomer composition serving as a matrix, within which a second elastomer composition originating from recycled tires is distributed substantially uniformly, the proportion of the second elastomer composition being greater than or equal to 40%.

14. The tire according to claim 13, wherein the first elastomer composition is a rubber composition.

15. The tire according to claim 13, wherein the second elastomer composition is present in an amount greater than or equal to 60%.

16. The tire according to claim 13, wherein the second elastomer composition is present in an amount greater than or equal to 80%.

17. The tire according to claim 13, wherein the insert is located under the crown region.

18. The tire according to claim 13, wherein the insert is located along at least one of the sidewalls in the radial direction.

19. The tire according to claim 13, wherein the insert is located in at least one axial end of the reinforcing structure.

20. The tire according to claim 13, wherein the insert is covered with an airtight layer devoid of elastomer composition originating from recycled tires.

21. The tire according to claim 20, wherein the airtight layer comprises more than 50 phr of butyl.

22. The tire according to claim 20, wherein the airtight layer comprises antioxidant elements.

23. The tire according to claim 13, wherein the second elastomer composition originating from recycled tires has a particle size distribution of less than or equal to 1 mm of mean diameter of each of the particles.

24. The tire according to claim 23, wherein the second elastomer composition originating from recycled tires has a particle size distribution of less than or equal to 0.5 mm of mean diameter of each of the particles.

25. The tire according to claim 24, wherein the second elastomer composition originating from recycled tires has a particle size distribution of less than or equal to 0.2 mm of mean diameter of each of the particles.

26. The tire according to claim 13, wherein the first elastomer composition has a high content of antioxidants.

Description

DESCRIPTION OF THE FIGURES

[0030] All the embodiment details are given in the following description, supplemented by the single figure presented solely for the purposes of non-limiting examples, and illustrating a cross-sectional view of an embodiment of a tyre provided with an insert arranged in the vicinity of the tyre cavity.

DETAILED DESCRIPTION OF THE INVENTION

[0031] FIG. 1 is a schematic representation of a sectional view of an example tyre comprising sidewalls 2 and a crown region 3 provided with a tread 4. As illustrated, the tyre provides a reinforcing structure 5 which extends from one sidewall to the other, passing via the crown region 3.

[0032] The sidewalls 2, the crown region 3 and the reinforcing structure 5 form a bearing structure suitable for supporting a part of the load corresponding to the weight of the vehicle and the restrictions related to the use of the vehicle. The bearing structure is delimited internally by the inner walls 10 and outer walls 11 of the tyre.

[0033] At least a portion of the region of the tyre that is axially inside the reinforcing structure 5 comprises an insert 6 in the (direct or indirect) vicinity of the cavity 9 of the tyre. The insert 6 is thus located between the reinforcing structure 5 and the tyre inner wall 10.

[0034] This insert consists of a first elastomer composition serving as a matrix, within which a second elastomer composition originating from recycled tyres is distributed substantially uniformly.

[0035] The proportion of second elastomer composition is greater than or equal to 40% and more preferentially greater than or equal to 60%, and even more preferentially greater than or equal to 80%.

[0036] The second elastomer composition has a particle size distribution of less than or equal to 1 mm and preferentially less than or equal to 0.5 mm and even more preferentially less than or equal to 0.2 mm of mean diameter of each of the particles.

[0037] In the example illustrated, the insert 6 passes through the whole of the inner region of the tyre, from one bead to the other. According to various embodiment variants, the insert is located in a narrower portion, such as, for example, in the radial direction in at least one of the sidewalls 2, or along the crown region 3, under the latter, or else in the shoulder region 8 of the tyre.

[0038] As illustrated, the insert is covered, on the side of the tyre cavity 9, with an airtight layer 7. This layer is devoid of elastomer composition originating from recycled tyres. It advantageously comprises more than 50 phr of butyl. It advantageously comprises antioxidant elements, such as, for example, 6 PPD.

[0039] The insert according to the invention may be used in any type of tyre. The advantages thereof are notable on tyres for heavy goods vehicles or civil engineering. For example, in the case of tyres for civil engineering, the thickness of the insert may be greater than 5 mm and, for some tyre sizes, may reach 8 to 10 mm.

Reference Numerals Employed in the Figures

[0040] 1 Tyre [0041] 2 Sidewall [0042] 3 Crown region [0043] 4 Tread [0044] 5 Reinforcing structure [0045] 6 Insert [0046] 7 Airtight layer [0047] 8 Shoulder [0048] 9 Cavity of the tyre [0049] 10 Tyre inner wall