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1. (WO2018227276) ROUE ÉQUIPÉE D'UN PNEU NON PNEUMATIQUE
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

CLAIMS

1 . A non-pneumatic tire comprising:

an annular beam that is elastomeric and configured to deflect at a contact patch of the non-pneumatic tire as the non-pneumatic tire rolls on a ground surface; and

an annular support that is elastomeric, extends radially inwardly from the annular beam and is configured to deform such that, when the non-pneumatic tire is loaded, an upper portion of the annular support above an axis of rotation of the non-pneumatic tire is in tension;

wherein a crack propagation rate of an elastomeric material of at least one of the annular beam and the annular support is no more than 1 e-4 mm/cycle at a strain energy release rate of 3 N-mm/mm2.

2. The non-pneumatic tire of claim 1 , wherein the crack propagation rate of the elastomeric material is no more than 1 e-5 mm/cycle at the strain energy release rate of 3 N-mm/mm2.

3. The non-pneumatic tire of claim 1 , wherein the crack propagation rate of the elastomeric material is no more than 1 e-5 mm/cycle at the strain energy release rate of 6 N-mm/mm2.

4. The non-pneumatic tire of any one of claims 1 to 3, wherein a modulus of elasticity of the elastomeric material is at least 90 MPa.

5. The non-pneumatic tire of any one of claims 1 to 3, wherein a modulus of elasticity of the elastomeric material is at least 130 MPa.

6. The non-pneumatic tire of any one of claims 1 to 5, wherein the annular beam comprises an outer annular portion, an inner annular portion, and a shearing annular portion between the outer annular portion and the inner annular portion that are elastomeric and configured to cause the annular beam to deflect more by shearing than by bending at the contact patch of the non-pneumatic tire.

7. The non-pneumatic tire of claim 6, wherein the shearing annular portion comprises a plurality of voids distributed in a circumferential direction of the non-pneumatic tire.

8. The non-pneumatic tire of any one of claims 6 and 7, wherein a given one of the outer annular portion and the inner annular portion is free of substantially inextensible reinforcement running in a circumferential direction of the non- pneumatic tire.

9. The non-pneumatic tire of claim 8, wherein: the given one of the outer annular portion and the inner annular portion is the outer annular portion; and the inner annular portion is free of substantially inextensible reinforcement running in the circumferential direction of the non-pneumatic tire.

10. The non-pneumatic tire of any one of claims 6 and 7, wherein the annular beam is free of substantially inextensible reinforcement running in a circumferential direction of the non-pneumatic tire.

1 1 . The non-pneumatic tire of any one of claims 1 to 10, wherein the annular support comprises a plurality of spokes, and each of the spokes extends freely from the annular beam towards a hub.

12. The non-pneumatic tire of claim 1 1 , wherein a free span length of each of the spokes is at least 15% of an outer diameter of the non-pneumatic tire.

13. The non-pneumatic tire of claim 1 1 , wherein a free span length of each of the spokes is at least 20% of an outer diameter of the non-pneumatic tire.

14. The non-pneumatic tire of any one of claims 1 to 13, wherein the annular beam comprises at least part of the elastomeric material.

15. The non-pneumatic tire of claim 14, wherein the annular beam is entirely made of the elastomeric material.

16. The non-pneumatic tire of any one of claims 1 to 15, wherein the annular support comprises at least part of the elastomeric material.

17. The non-pneumatic tire of claim 16, wherein the annular support is entirely made of the elastomeric material.

18. The non-pneumatic tire of any one of claims 1 to 13, wherein the annular support comprises at least part of the elastomeric material.

19. The non-pneumatic tire of claim 18, wherein the annular support is entirely made of the elastomeric material.

20. The non-pneumatic tire of any one of claims 1 to 19, wherein the elastomeric material is thermoset.

21 . The non-pneumatic tire of any one of claims 1 to 19, wherein the elastomeric material is thermoplastic.

22. The non-pneumatic tire of any of claims 1 to 21 , wherein the elastomeric material is a first elastomeric material, and the non-pneumatic tire comprises a tread disposed radially outward of the annular beam and comprising a second elastomeric material different from the first elastomeric material.

23. A vehicle comprising the non-pneumatic tire of any one of claims 1 to 22.

24. A non-pneumatic tire comprising:

an annular beam that is elastomeric and configured to deflect at a contact patch of the non-pneumatic tire as the non-pneumatic tire rolls on a ground surface; an annular support that is elastomeric, extends radially inwardly from the annular beam and is configured to deform such that, when the non-pneumatic tire is loaded, an upper portion of the annular support above an axis of rotation of the non-pneumatic tire is in tension, the annular support comprising a plurality of spokes, each of the spokes extending freely from the annular beam towards a hub, a free span length of each of the spokes being at least 15% of an outer diameter of the non-pneumatic tire; and

a tread that is elastomeric and disposed radially outward from the annular beam;

wherein: a crack propagation rate of an elastomeric material of at least one of the annular beam and the annular support is no more than 1 e-4 mm/cycle at a strain energy release rate of 3 N-mm/mm2; and an elastomeric material of the tread is different from the elastomeric material of at least one of the annular beam and the annular support.

25. The non-pneumatic tire of claim 24, wherein the crack propagation rate of the elastomeric material of at least one of the annular beam and the annular support is no more than 1 e-5 mm/cycle at the strain energy release rate of 3 N-mm/mm2.

26. The non-pneumatic tire of claim 24, wherein the crack propagation rate of the elastomeric material of at least one of the annular beam and the annular support is no more than 1 e-5 mm/cycle at the strain energy release rate of 6 N-mm/mm2.

27. The non-pneumatic tire of any one of claims 24 to 26, wherein a modulus of elasticity of the elastomeric material of at least one of the annular beam and the annular support is at least 90 MPa

28. The non-pneumatic tire of any one of claims 24 to 27, wherein the elastomeric material of at least one of the annular beam and the annular support is a thermoset elastomer comprising a low free MDI prepolymer and comprising a curing system comprising diamine (MDA) and NaCI,.

29. The non-pneumatic tire of any one of claims 24 to 27, wherein the elastomeric material of at least one of the annular beam and the annular support is a thermoplastic polyether-ester block copolymer elastomer.

30. The non-pneumatic tire of claim 29, wherein the elastomeric material of at least one of the annular beam and the annular support comprises 2% to 10% carbon black, by weight.

31 . The non-pneumatic tire of claim 25, wherein the elastomeric material of at least one of the annular beam and the annular support comprises 0.5% to 2% Kevlar pulp, by weight.

32. The non-pneumatic tire of claim 25, wherein the elastomeric material of at least one of the annular beam and the annular support comprises 0.5% of 2% Kevlar floe, by weight.

33. A non-pneumatic tire comprising:

an annular beam configured to deflect at a contact patch of the non-pneumatic tire as the non-pneumatic tire rolls on a ground surface, the annular beam comprising an outer annular portion, an inner annular portion, and a shearing annular portion between the outer annular portion and the inner annular portion that are elastomeric and configured to cause the annular beam to deflect more by shearing than by bending at the contact patch of the non-pneumatic tire; and an annular support that is elastomeric, extends radially inwardly from the annular beam and is configured to deform such that, when the non-pneumatic

tire is loaded, an upper portion of the annular support above an axis of rotation of the non-pneumatic tire is in tension;

wherein a crack propagation rate of an elastomeric material of at least one of the annular beam and the annular support is no more than 1 e-4 mm/cycle at a strain energy release rate of 3 N-mm/mm2; and a thickness tBAND of the inner annular portion in a radial direction of the non-pneumatic tire, a radius RBEAM of the annular beam, and a modulus of elasticity EBAND of an elastomeric material of the inner annular portion are related by 1.8 MPa < EBANDtBAND < η u?a.

RBEAM