Pneumatic tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorMasayoshi INOUE
Life of this patent
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Abstract
The pneumatic tire comprises a carcass and a pair of bead portions each with a bead core and a bead apex. The carcass comprises a carcass ply having a pair of turned-up portions and a main portion therebetween. At least one of the bead portions 4 is provided with a bead reinforcing rubber disposed on the axially outside of the turned-up portion. The bead reinforcing rubber comprises an axially outer first reinforcing rubber layer and an axially inner second reinforcing rubber layer. The complex elastic modulus of the second reinforcing rubber layer is smaller than the complex elastic modulus of the first reinforcing rubber layer.
Claims20
A pneumatic tire comprising:
- a pair of bead portions each provided with a bead core and a bead apex which extends radially outwardly from the bead core in a tapered manner, and
- a toroidal carcass comprising a carcass ply extending between the bead portions and turned up around the bead core in each bead portion from the axially inside to the axially outside so as to form a pair of turned-up portions and a main portion therebetween,
- the turned-up portions extending radially outwardly on the axially outer sides of the bead apexes, respectively,
- wherein
- at least one of the bead portions is provided with a bead reinforcing rubber disposed on the axially outer side of the turned-up portion,
- the bead reinforcing rubber comprises a first reinforcing rubber layer and a second reinforcing rubber layer disposed axially inside the first reinforcing rubber layer, and
- a complex elastic modulus E*2 of the second reinforcing rubber layer is smaller than a complex elastic modulus E*1 of the first reinforcing rubber layer.
Dependencies are inferred from the claim text.