Pneumatic tire
AssigneeBridgestone Corporation
InventorMasahiro Takayama
Life of this patent
Estimating the term…
Abstract
A pneumatic tire comprising a tread having an outer tread portion arranged at a radially outer side of the tire and composed of one kind of rubber, and an inner tread portion arranged radially inward of an outer surface of a tread wear indicator and composed of several kinds of rubbers, and a pair of sidewalls each arranged between the tread and a bead, the inner tread portion being axially divided into at least three regions and having a central region extending across an equatorial line of the tire and side end regions arranged in opposite sides of the central region, hardnesses of the rubbers of the inner tread portion being gradually increased axially from the central region to the side end region, and hardness of the rubber of an axially outermost side end region being smaller than that of the rubber of the outer tread portion.
Claims6
A pneumatic tire comprising:
- a carcass having a crown portion, a belt for reinforcing said crown portion, a tread arranged outwardly of said belt and having an outer tread portion arranged at a radially outer side of said tire and composed of one kind of rubber and an inner tread portion arranged radially inward of an outer surface of a tread wear indicator and composed of several kinds of rubber, and a pair of sidewalls each arranged between said tread and a bead,
- said inner tread portion being axially divided into at least three regions and having a central region extending across an equatorial line of said tire and side end regions arranged on oposite sides of said central region,
- the hardnesses of the rubbers of said inner tread portion being gradually increased axially from said central region to said side end regions, and the hardnesses of the rubber of the axially outermost side end regions being smaller than that of the rubber of said outer tread portion.
Dependencies are inferred from the claim text.