Invention Grant
- Patent Title: Tire with improved beads
- Patent Title (中): 轮胎改良珠
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Application No.: US14000309Application Date: 2012-02-16
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Publication No.: US09248704B2Publication Date: 2016-02-02
- Inventor: Frederic Bourgeois , Francois-Xavier Bruneau
- Applicant: Frederic Bourgeois , Francois-Xavier Bruneau
- Applicant Address: FR Clermont-Ferrand CH Granges-Paccot
- Assignee: COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN,Michelin Recherche et Technique S.A.
- Current Assignee: COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN,Michelin Recherche et Technique S.A.
- Current Assignee Address: FR Clermont-Ferrand CH Granges-Paccot
- Agency: Cozen O'Connor
- Priority: FR1151289 20110217
- International Application: PCT/EP2012/052712 WO 20120216
- International Announcement: WO2012/110612 WO 20120823
- Main IPC: B60C15/00
- IPC: B60C15/00 ; B60C15/06

Abstract:
Tire comprising two beads comprising an annular reinforcing structure, a carcass reinforcement anchored in the two beads so as to form a main portion and a wrapped-around portion, each wrapped-around portion extending radially outwards as far as an end situated at a radial distance DEC that is less than or equal to 10% of the radial height H of the tire; each bead comprising an apex made of a rubber composition having an elastic modulus greater than 40 MPa, extending radially as far as a radial distance DEE1 comprised between 10% and 15% of the height H; each bead further comprising an outer strip made of a rubber composition that has an elastic modulus G′ less than or equal to 15 MPa and a viscous modulus G″ such that: G″[MPa]≦0.2·G′[MPa]−0.2 MPa, extending at least between 20% and 25% of the height H, the apex having an axial thickness E(r) that is substantially a linear function of r, r denoting the distance with respect to the radially innermost point of the annular structure, wherein the entity formed by the apex and outer strip has a thickness ET(r) such that, in the range of distances r comprised between 25 and 45% of the height H of the tire, the variation in thickness ∂ ET ( r ) ∂ r is negative and has an absolute value that is greater than or equal to 0.25 mm/mm over at least 4% of the height H; and wherein said annular structure has a maximum axial width DE such that the ratio ET ( r ) max - DE ET ( r ) max , where ET(r)max is the maximum value of the thickness ET(r), is less than 10%.
Public/Granted literature
- US20140008002A1 TIRE WITH IMPROVED BEADS Public/Granted day:2014-01-09
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