Resilient tires and wheels – Tires – resilient – Pneumatic tire or inner tube
Reexamination Certificate
1999-12-16
2001-10-23
Johnstone, Adrienne C. (Department: 1733)
Resilient tires and wheels
Tires, resilient
Pneumatic tire or inner tube
C152S548000, C152S551000, C152S557000
Reexamination Certificate
active
06305452
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a pneumatic radial tire for passenger car capable of simultaneously establishing the steering stability and the ride comfort.
2. Description of Related Art
In the pneumatic radial tire for passenger car, it is common to ensure the ride comfort and the steering stability together by constituting the carcass with one to three carcass plies containing organic fiber cords therein.
Recently, it strongly tends to make the grade of the passenger car higher, and hence it is demanded to more improve the ride comfort of the passenger car tire.
However, the ride comfort and the steering stability are conflicting with each other. In general, if it is intended to improve the ride comfort, the steering stability is apt to be degraded. Therefore, it is demanded to develop a new way for simultaneously satisfying the ride comfort and the steering stability.
SUMMARY OF THE INVENTION
It is, therefore, an object of the invention to provide a pneumatic radial tire for passenger car realizing the improvement of the ride comfort without sacrificing the steering stability.
In order to simultaneously establish the ride comfort and the steering stability, the inventor has examined the basic structure of the tire and found out that it is advantageous to remove a portion of the carcass located beneath the belt to reduce the stiffness in the crown portion of the tire for improving the ride comfort and the excellent steering stability can be maintained by supplementing the stiffness of the belt corresponding to the removed portion of the carcass in the widthwise direction with a proper means. As a result, the invention has been accomplished.
According to the invention, there is the provision of a pneumatic radial tire for passenger car comprising a carcass of a radial structure toroidally extending between a pair of bead cores and comprised of at least one rubberized carcass ply containing organic fiber cords therein, and a belt reinforcing a crown portion of the carcass and comprised of plural belt layers, wherein at least one carcass ply has a cut-out zone in its crown portion and a carcass supporting layer is arranged adjacent to the cut-out zone.
In a preferable embodiment of the invention, a modulus of elasticity of the carcass supporting layer is lower than that of the carcass.
In another preferable embodiment of the invention, a length of the cut-out zone in a widthwise direction of the tire is 20-70% of a maximum width of the belt.
In the other preferable embodiment of the invention, the carcass supporting layer is a rubberized body containing a plurality of organic fiber cords having a diameter of 0.1-0.5 mm.
It is also preferable that the organic fiber cord has a melting point of not higher than 150° C.
In a further preferable embodiment of the invention, a belt reinforcing layer covering at least a side end of the belt is arranged at an outside of the belt in a radial direction of the tire.
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patent: 1211735 (1960-03-01), None
patent: 2 017 016 A (1979-10-01), None
Bridgestone Corporation
Johnstone Adrienne C.
Sughrue Mion Zinn Macpeak & Seas, PLLC
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