Pneumatic tire with specified band cord

Resilient tires and wheels – Tires – resilient – Pneumatic tire or inner tube

Reexamination Certificate

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C152S531000, C152S533000

Reexamination Certificate

active

06581662

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a pneumatic tire, more particularly to a tread reinforcing structure being capable of reducing tire noise during running.
In order to improve high-speed durability of a pneumatic tire especially a radial tire for passenger cars, a single-layered full-width nylon band over a breaker is widely used. Here, a band means a cord layer whose cord angle is less than about 10 degrees usually less than 5 degrees with respect to the tire equator, and a breaker means a cord layer whose cord angle is more than 10 degrees usually more than 15 degrees.
Such a single-layered full-width band can reduce a road noise around a frequency of 250 Hz heard on the inside of a vehicle during running. By providing a single-layered full-width band made of a high tensile modulus aramid cord instead of the relatively low modulus nylon cord, such a road noise may be reduced more, but a pass-by noise heard on the outside of a vehicle during running tends to increase.
BRIEF SUMMARY OF THE INVENTION
It is therefore, an object of the present invention to provide a pneumatic tire, in which the road noise and pass-by noise can be improved.
According to the present invention, a pneumatic tire comprises
a carcass extending between bead portions through a tread portion and sidewall portions,
a breaker disposed radially outside a crown portion of the carcass and made of cords laid at an angle of from 15 to 40 degrees with respect to the tire equator,
a band disposed radially outside the breaker and comprising a full-width band ply extending over the substantially overall width of the breaker and made of at least one cord forming a small angle with respect to the tire equator, wherein
a cord or cords of said full-width band ply existing in a tread crown region satisfy the following conditions Eq.1-Eq.5,
T>0.8  Eq.1
0≦K+6.67T−21.7  Eq.2
0≦45−10T−K  Eq.3
0≦106.8−57.5T−K  Eq.4
7≦E≦13  Eq.5
wherein
the tread crown region is defined as a region centered on the tire equator and having an axial width of either 30 mm or 25% of the axial width of the breaker which is not less than the other,
the symbol “K” is an stretch-resistance index (N) of a cord which is defined as the product of the sectional area S in sq.mm and 2% modulus M in N/sq.mm of the cord divided by 100,
the symbol “T” is an stretch in % of the cord in the tire being in its natural state without being mounted on a wheel rim, and
the symbol “E” is a cord count per 1 cm width of the full-width band ply.


REFERENCES:
patent: 5558144 (1996-09-01), Nakayasu et al.
patent: 6425426 (2002-07-01), Osborne et al.

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