Pneumatic tire
OwnerToru FUKUMOTOinventor
Life of this patent
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Abstract
A pneumatic tire comprises a carcass composed of at least one carcass ply made of carcass cords arranged at a cord count E. Each of the carcass cords is composed of two strands final-twisted together. Each of the two strand is made of polyethylene terephthalate fibers first-twisted together. The polyethylene terephthalate fibers of the two strands has a linear density D of not more than 2200 dtex. The linear density D in dtex, the cord count E per 5 cm width of the carcass ply, a breaking strength S(N) of the carcass cord, and a Gurley stiffness B (mN) of the carcass cord satisfy conditional equations: E≦(−30.6 Ln D+307); B≧357/E; and s≧4161/E.
Claims20
A pneumatic tire comprising a carcass composed of at least one carcass ply extending between bead portions through a tread portion and sidewall portions, the carcass ply made of carcass cords arranged at a cord count E, wherein
- each said carcass cord is composed of two strands final-twisted together,
- each said strand is made of polyethylene terephthalate fibers,
- the polyethylene terephthalate fibers of the two strands has a linear density D of not more than 2200 dtex, and
- said linear density D in dtex, said cord count E (ends/5 cm) per 5 cm width of the carcass ply, a breaking strength S(N) of the carcass cord, and a Gurley stiffness B (mN) of the carcass cord satisfy conditional equations (1) to (3):
- E≦−30.6 Ln D+307 (1)
- B≧357/E (2)
- S≧4161/E (3)
Dependencies are inferred from the claim text.