Pneumatic tire
AssigneeThe Yokohama Rubber Co., Ltd.
InventorsAsuka SUZUKI, Takamitsu CHAYA
Life of this patent
Estimating the term…
Abstract
In a pneumatic tire provided with a carcass layer and a belt layer, the carcass layer is formed of an organic fiber cord having an elongation at break of 20% to 30%, an elongation in a sidewall portion under a load of 2.0 cN/dtex of 5.5% to 8.0%, and a product A = D × Ec of a fineness based on corrected mass D (unit: dtex/piece) and a count Ec (unit: piece/50 mm) of 1.8 × 105 dtex/50 mm to 3.0 × 105 dtex/50 mm, and the belt layer is formed of a steel cord having a stress at break of 3300 MPa or more and a product B = S x Eb of a cross-sectional area S (unit: mm2/piece), and a count Eb (unit: piece/50 mm) is from 6.0 mm2/50 mm to 7.5 mm2/50 mm.
Claims5
A pneumatic tire, comprising:
- a tread portion extending in a tire circumferential direction and having an annular shape;
- a pair of sidewall portions disposed on respective sides of the tread portion;
- a pair of bead portions disposed in the sidewall portions on an inner side in a tire radial direction;
- at least one layer of a carcass layer mounted between the pair of bead portions;
- a plurality of layers of belt layers disposed on an outer circumferential side of the carcass layer in the tread portion;
- the carcass layer being formed of a carcass cord made of an organic fiber cord, an elongation at break of the carcass cord being from 20% to 30%, an elongation under a load of 2.0 cN/dtex of the carcass cord in the sidewall portions being from 5.5% to 8.0%, a product A = D × Ec of a fineness based on corrected mass D (unit:
- dtex/piece) per the carcass cord and a count Ec (unit:
- piece/50 mm) of the carcass cords per 50 mm in a direction orthogonal to an extension direction of the carcass cord being from 1.8 × 105 dtex/50 mm to 3.0 × 105 dtex/50 mm,
- the belt layer being constituted of a belt cord formed of a steel cord, stress at break of the belt cord being 3300 MPa or more, a product B = S × Eb of a cross-sectional area S (unit:
- mm2/piece) per the belt cord and a count Eb (unit:
- piece/50 mm) of the belt cord per 50 mm in a direction orthogonal to an extension direction of the belt cord being from 6.0 mm2/50 mm to 7.5 mm2/50 mm.
Dependencies are inferred from the claim text.