Resilient tires and wheels – Tires – resilient – Cushion and pneumatic combined
Reexamination Certificate
1999-02-26
2001-11-20
Johnstone, Adrienne C. (Department: 1733)
Resilient tires and wheels
Tires, resilient
Cushion and pneumatic combined
C152S166000, C152S196000
Reexamination Certificate
active
06318427
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a tire system for motorcycles comprising a pneumatic tire, a tire core disposed therein and a pressure bag disposed in the core.
2. Description of the Related Art
In motorcycles arranged for running off-road, a pneumatic tire is usually used together with a tire tube because the tire inflation pressure is relatively low. In this case, therefore, the tire tube is liable to puncture when getting over edged objects such as rocks, stumps and the like and landing after a high jump for example.
In order to prevent such punctures of tire tube, the laid-open Japanese patent application No. JP-A-3-231008 has proposed to use a buffer made of sponge rubber disposed between the tire and tube. The buffer is effective for preventing the punctures. However, the durability of the buffer is liable to be decreased by heat generation during running due to friction between the tire and buffer. If the buffer is increased in the volume to reduce the friction, it becomes difficult to mount the tire on the rim.
SUMMARY OF THE INVENTION
It is therefore, an object of the present invention to provide a tire system, in which the durability can be improved without increasing the difficulty in the assembling work.
According to the present invention, a tire system comprises
a pneumatic tire having a cavity,
an annular tire core made of an elastic closed-cell material disposed in the cavity and provided on the radially inside with a groove,
a pressure bag inserted in the groove, wherein
in a free state of the tire core not disposed in the cavity,
the cross sectional are Sa of the tire core is in the range of from 3.1 to 4.8 times the cross sectional are Sb of the groove, and
the total Sa+Sb of the cross sectional area Sa of the tire core and the cross sectional area Sb of the groove is in the range of from 1.0 to 1.3 times the cross sectional are Sc of the cavity.
REFERENCES:
patent: 3231008 (1991-10-01), None
Fujiwara Ken-ichi
Kuwahara Takao
Birch & Stewart Kolasch & Birch, LLP
Johnstone Adrienne C.
Sumitomo Rubber Industries Ltd.
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