Resilient tires and wheels – Tires – resilient – Pneumatic tire or inner tube
Reexamination Certificate
2006-09-08
2008-12-09
Fischer, Justin (Department: 1791)
Resilient tires and wheels
Tires, resilient
Pneumatic tire or inner tube
C152S450000, C152S541000, C152S552000, C152S554000
Reexamination Certificate
active
07461679
ABSTRACT:
A heavy duty tire having a bead wind structure and comprising a bead reinforcing layer15having a U-shaped cross section disposed in each bead portion4, wherein the axially outer portion15o of the bead reinforcing layer15and its radially outer end Pe are protected by an axially inner rubber20disposed between the carcass main portion6a and the outer portion15o and an axially outer rubber30disposed between the outer portion15o and the axially outer surface TS of the tire, in which the inner rubber20includes a first low modulus rubber portion21having a complex elastic modulus of 3.0 to 6.0 MPa, the thickness Ti of the inner rubber 20 measured on a first base line X1drawn from the radially outer end Pe at right angles to the carcass main portion6a is from 7.0 to 13.0 mm and the ti/Ti ratio of a thickness ti of the first low modulus rubber portion21on the first base line X1to the thickness Ti is at least 0.9; and in which the outer rubber30includes a second low modulus rubber portion31having a complex elastic modulus of 3.0 to 6.0 MPa, the thickness To of the outer rubber30measured on a second base line X2drawn from the radially outer end Pe at right angles to the axially outer surface TS of the tire is from 5.0 to 11.0 mm and the to/To ratio of a thickness “to” of the second low modulus rubber portion31on the second base line X2to the thickness To is at least 0.4. The weight of the bead portion can be reduced while maintaining the bead durability.
REFERENCES:
patent: 5107915 (1992-04-01), Shimomura et al.
patent: 2005/0126675 (2005-06-01), Maruoka et al.
patent: 2005/0150583 (2005-07-01), Maruoka et al.
patent: 2005-170145 (2005-06-01), None
Birch & Stewart Kolasch & Birch, LLP
Fischer Justin
Sumitomo Rubber Industries Ltd.
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