Resilient tires and wheels – Tires – resilient – Pneumatic tire or inner tube
Reexamination Certificate
2000-08-09
2002-05-07
Johnstone, Adrienne C. (Department: 1733)
Resilient tires and wheels
Tires, resilient
Pneumatic tire or inner tube
C152S458000, C152S532000, C152S549000, C152S559000, C152S564000, C152S565000
Reexamination Certificate
active
06382285
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a pneumatic tire, more particularly to a pneumatic tire such as a pneumatic racing cart tire that is used for a go-cart (a simple structured small automobile with an engine).
In a bias racing tire having at least two carcass plies, particularly a racing cart tire of a small outer diameter (300 mm or smaller, for example) and a small aspect ratio (55% or smaller, for example), it is a subject for improving driving stability and high-speed durability of a tire how the expansion of a contact portion (that is, a cap tread portion) due to the centrifugal force at high-speed running is suppressed. As a method for solving such a subject Japanese patent application Kokai publication Nos. 4-283106 and 4-189603, for example, propose a method for providing a belt on a carcass of the contact portion. However, since the use of such a radial structure for the racing cart tire is prohibited by a competition rule of the racing cart, such a method cannot be used, and other methods must be taken. Moreover, Japanese patent application Kokai publication No. 8-244403 discloses a technology of increasing the number of plies to 3, but this technology has a disadvantage of increasing a tire weight and, in addition, of increasing a cost, which is not ignorable. Therefore, this technology is not preferable.
Japanese patent application Kokai publication No. 6-255304 discloses a technology of providing a rubber sheet between the carcass plies at the contact portion for reinforcement thereof. This technology is constituted so as to use only, and shows a certain extent of effect. But the technology cannot effectively solve problems of expansion of the tire contact portion due to the centrifugal force at high-speed running and generation of heat at the tire contact portion yet.
SUMMARY OF THE INVENTION
The object of the present invention is to eliminate the above-described problems of the conventional pneumatic bias racing tire, and to improve driving stability, mainly stability on straight running at high-speed running of a pneumatic bias racing tire and high-speed durability thereof by improving rigidity of the tire contact portion to suppress expansion of the tire contact portion due to the centrifugal force at high-speed running.
In order to achieve the foregoing object, according to the present invention, a pneumatic tire having at least two carcass plies is provided, wherein a high hardness rubber component sheet with tensile stress of 2.0 MPa or more when extended by 20% to a tire circumferential direction and JIS-A hardness of 65 or more is arranged at least between carcass plies at a tread portion.
REFERENCES:
patent: 3067795 (1962-12-01), Neuville et al.
patent: 06255304 (1994-09-01), None
Kanenari Daisuke
Mori Shinichi
Johnstone Adrienne C.
Rader & Fishman & Grauer, PLLC
The Yokohama Rubber Co. Ltd.
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