Tyre for bicycle wheels

Patent metadata

Field	Value
Publication number	US-11633986-B2
Application number	US-201917055275-A
Country	US
Kind code	B2
Filing date	May 21, 2019
Priority date	May 22, 2018
Publication date	Apr 25, 2023
Grant date	Apr 25, 2023

Abstract

The present invention relates to a tyre for bicycle wheels comprising a tread band containing an anti-puncture system capable of offering high resistance to the penetration of foreign bodies. In particular, the present invention relates to a tyre (100) for bicycle wheels comprising: —a carcass structure (2); and —a tread band (7) arranged in a radially outer position with respect to said carcass structure (2); characterised in that said tread band (7) is made by vulcanisation of a vulcanisable elastomeric compound comprising fibrillated polymeric fibres of micrometric dimensions, wherein at least one protective layer (6, 11) is interposed between said carcass structure (2) and said tread band (7), said protective layer (6, 11) comprising (i) a plurality of reinforcing cords of textile material oriented with respect to the equatorial plane of the tyre with an angle greater than 30°, (ii) a square fabric with textile fibres of the weft or warp oriented with respect to the equatorial plane of the tyre with an angle greater than 20°, or (iii) a non-woven fabric with randomly oriented textile fibres.

First claim

The invention claimed is:

1. A tyre for bicycle wheels comprising:
a carcass structure;
a tread band arranged in a radially outer position with respect to the carcass structure with a vulcanized elastomeric material, wherein the vulcanized elastomeric material comprises, before vulcanization, a vulcanizable elastomeric compound comprising fibrillated polymeric fibres of micrometric dimensions; and
at least one protective layer interposed between the carcass structure and the tread band, wherein the protective layer comprises:
a plurality of reinforcing cords of textile material oriented with respect to the equatorial plane of the tyre with an angle greater than 30°;
a square fabric with textile fibres of the weft or warp oriented with respect to the equatorial plane of the tyre with an angle greater than 20° or
a non-woven fabric with randomly oriented textile fibres; and
wherein the tyre for bicycle wheels has a weight of less than, or equal to, about 2 kg, and

wherein a radius of camber of the tyre for bicycle wheels is between 10 mm and 18 mm in a crown portion and is between 15 mm and 30 mm in side portions of the tyre.

2. The tyre according to claim 1 , further comprising at least one additional protective layer arranged in a radially inner position with respect to the tread band.

3. The tyre according to claim 2 , wherein the additional protective layer arranged in a radially inner position with respect to the tread band is interposed in the carcass structure or is in a radially inner position with respect to the carcass structure.

4. The tyre according to claim 1 , wherein the protective layer comprises a plurality of reinforcing cords of textile material oriented with respect to the equatorial plane of the tyre with an angle greater than 35°.

5. The tyre according to claim 1 , wherein the protective layer comprises a square fabric with textile fibres of the weft or warp oriented with respect to the equatorial plane of the tyre with an angle greater than 25°.

6. The tyre according to claim 1 , wherein the protective layer comprises a non-woven fabric with randomly oriented textile fibres arranged in layers or crossed.

7. The tyre according to claim 6 , wherein the protective layer is made by using mechanical processes, thermal processes, and/or adhesives.

8. The tyre according to claim 1 , wherein the protective layer has an extension equal to or greater than 30% of the axial development of the tread band.

9. The tyre according to claim 1 , wherein the protective layer has an extension equal to or greater than 100% of the axial development of the tread band.

10. The tyre according to claim 1 , wherein the protective layer extends up to 65% of the axial development of the tyre.

11. The tyre according to claim 1 , wherein the protective layer extends up to 100% of the axial development of the tyre from bead to bead.

12. The tyre according to claim 1 , wherein the protective layer extends symmetrically with respect to the equatorial plane of the tyre.

13. The tyre according to claim 1 , wherein the protective layer comprises a textile material chosen from aramid fibres, lyocell fibres, nylon fibres, rayon fibres, cotton fibres, polyester fibres, vinyl fibres, and combinations thereof.

14. The tyre according to claim 1 , wherein the protective layer comprises a textile material comprising high modulus elastic fibres.

15. The tyre according to claim 14 , wherein the high modulus elastic fibres are aramid fibres and/or lyocell fibres.

16. The tyre according to claim 1 , wherein the protective layer has a cord density greater than or equal to about 20 TPI.

17. The tyre according to claim 1 , wherein the protective layer has a cord density less than or equal to about 300 TPI.

18. The tyre according to claim 1 , wherein the fibrillated polymeric fibres are chosen from aramid fibres, polyester fibres, acrylic fibres, microfibrillated cellulose fibres, and vegetable fibres.

19. The tyre according to claim 1 , wherein the fibrillated polymeric fibres have a diameter less than 100 μm and a length between about 0.05 mm and about 8 mm.

20. The tyre according to claim 1 , wherein the fibrillated polymeric fibres exhibit an aspect ratio between the length and diameter greater than 30:1.

21. The tyre according to claim 1 , wherein the fibrillated polymeric fibres exhibit a surface area ranging from about 0.5 m 2 /g to about 60 m 2 /g.

22. The tyre according to claim 1 , wherein the vulcanizable elastomeric compound comprises:
(a) 100 phr of at least one diene elastomeric polymer;
(b) 0.1 phr to 20 phr of the fibrillated polymeric fibres, and
(c) 1 to 120 phr of a reinforcement filler.

23. The tyre according to claim 22 , wherein the fibrillated polymeric fibres are present in the elastomeric compound in an amount of from 0.5 phr to 10 phr, or from 1 phr to 5 phr.

Assignees

• Pirelli

Inventors

• Erbizzoni Laura
• Dal Bello Lindo Vinicius Augusto
• Misani Pierangelo

Classifications

• B60C15/0045

  with ply turn-up up to the belt edges, i.e. folded around the bead core and extending to the belt edges · CPC title

• B60C2009/2019

  comprising cords at an angle of 30 to 60 degrees to the circumferential direction · CPC title

• B60C11/0083

  characterised by the curvature of the tyre tread · CPC title

• B60C1/0016

  Compositions of the tread · CPC title

• B60C2009/1814

  square woven · CPC title