Pneumatic radial tire

Details Pneumatic radial tire Pneumatic radial tire

2001-10-31

2004-12-28

Copenheaver, Blaine (Department: 1733)

Resilient tires and wheels

Tires, resilient

Pneumatic tire or inner tube

C152S541000, C152S542000, C152S552000, C152S554000, C152S546000

Reexamination Certificate

active

06834698

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a pneumatic radial tire suitable for use as a high performance tire particularly aimed to run on circuits and being capable of improving initial response characteristics at the time of steering and of achieving cuts in running times by restricting deformation owing to torsion at bead portions thereof.
DESCRIPTION OF THE PRIOR ART
In a high performance tire aimed for high speed running such as running on circuits, a
1
—
1
structure is often employed for the purpose of improving lateral rigidity and of securing cornering force wherein a carcass A is formed of an inner carcass ply A
1
(so-called inner ply) that is fold up from inside to outside around a bead core B and an outer carcass ply A
2
(so-called outer ply) that is overlapped with and connected to the fold-up portion A
1
a
of the inner carcass ply A
1
by being extending inwardly to the outside of the bead core B as schematically illustrated in FIG.
6
.
Since the inner and outer carcass plies A
1
, A
2
enwrap therein the bead core B and a bead apex rubber C to form a shell structure in such a
1
—
1
structure, movements of side wall portions can be advantageously restricted to improve the lateral rigidity.
However, even such a tire of improved lateral rigidity is not enough to improve response delays of a vehicle when its steering wheel is initially operated, and is not enough to cut the running time to the extent expected.
The inventor supposed that deformation owing to torsion of the bead portions in an initial stage of steering is a large factor thereof. More particularly, while movements are transmitted at the time of steering from a wheel rim to the bead portions, from the bead portions to the side wall portion, and from the side wall portion to a tread portion in this order, it is assumed that occurrence of torsional deformation of a pulled portion of the bead portions or bead cores at the initial stage of steering, causes a delay in transmission of movements to the tires.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a pneumatic radial tire capable of achieving cuts in running time by basically providing first and second bead reinforcing layers at bead portions of a tire having a carcass of
1
—
1
structure to thereby restrict deformation owing to torsion in the bead portions and to improve initial response characteristics at the time of steering.


REFERENCES:
patent: 2971553 (1961-02-01), Woodall
patent: 4295511 (1981-10-01), Mezzanotte et al.
patent: 4896709 (1990-01-01), Alie et al.
patent: 5111865 (1992-05-01), Shinmura
patent: 5538572 (1996-07-01), Sakamoto et al.
patent: 0 595 653 (1994-05-01), None
patent: 2 615 453 (1988-11-01), None
patent: 58-4610 (1983-01-01), None
patent: 2-334410 (1990-02-01), None
Mechanics of Pneumatic Tires, ed. Samuel Clark. Washington D.C., US Department of Commerce, 1971, p 373.

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