Resilient tires and wheels – Tires – resilient – Pneumatic tire or inner tube
Patent
1991-03-11
1992-11-17
Ball, Michael W.
Resilient tires and wheels
Tires, resilient
Pneumatic tire or inner tube
152547, 152555, B60C 1900, B60C 1506
Patent
active
051640295
DESCRIPTION:
BRIEF SUMMARY
FIELD OF ART
The present invention relates to a radial tire for high load which is suitable for material handling in industrial vehicles and in construction vehicles, wherein driving stability and vibration damping performance are improved.
BACKGROUND ART
Hitherto, there has been used the so called bias tire as a tire for high loads such as tires for industrial vehicles, construction vehicles and the like, but recently, a radial tire in which steel cords are embedded in its carcass is most popular because it excels in ride comfort and wear resistance.
However, such radial tire has a low vertical spring coefficient. Therefore, especially when it is applied to forklifts which have many opportunities for turning, starting and stopping, rolling and pitching of the vehicle tend to occur. Also at the time of driving, when the tires run over projections or obstacles on the road, it gives the vehicle body unstable rolling properties. This becomes a problem, if steel radial tires with conventional structure are used on industrial vehicles, such as the forklifts or high place working vehicles, because they become a factor in the vibration of the mast or the crane thereof, whereas if applied to the passenger cars this presents no problem.
Ways of reinforcing the carcass of the radial tire have been studied, particularly the portions in the tire sidewalls which are largely bent, and the matters by which the vibration damping performance is improved has been investigated, throughly, thereby arriving at the completion of the present invention.
DISCLOSURE OF INVENTION
The present invention relates to a radial tire for high load which is characterized by: a carcass in which steel cords are laid at an angle of 70 to 90 degrees to the circumferential direction of the tire and in which both edges are folded back around bead cores and secured thereto; a belt layer in which steel cords are arranged outside the crown of the carcass at a small angle to the circumferential direction of the tire; bead apexes between the carcass and the folded portions thereof which extend toward the sidewalls of the tire each from the upper side of each bead core while gradually decreasing the thickness and carcass cord reinforcing layers adjacent the carcass along their radial width which extend to beads from both edge portions of the belt layer.
BRIEF DESCRIPTION OF DRAWINGS
The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus, are not limitative of the present invention, and wherein:
FIG. 1 shows the radial tire of the present invention wherein the carcass layer is shown radially inside of the carcass cord reinforcing layer;
FIG. 2 shows the radial tire of the present invention wherein the carcass cord reinforcing layer is shown radially inside of the carcass layer; and
FIG. 3 shows the radial tire of the present invention wherein the carcass layer is disposed between carcass cord reinforcing layers.
DETAILED DESCRIPTION OF THE INVENTION
In FIG. 1, the radial tire for high load 1 has a carcass 3 in which both edges are folded back around the bead cores 2 and secured thereto, a belt layer 4, containing belt plies 4A, 4B and 4C, bead apexes 5 and carcass cord reinforcing layers 6 disposed on the outside of the carcass which extends to the beads from both edge portions of the belt layer 4. Each bead is reinforced with a bead reinforcing layer 7, which is disposed on the outside (in this embodiment) of the carcass 3 so as to surround the bead core 2, and each carcass cord reinforcing layer 6 overlaps with the belt layer 4 and the bead reinforcing layer 7 in both edge portions thereof in the radial direction of the tire.
The carcass cord reinforcing layers 6 are provided for reinforcing the sidewalls of the tire, and, for that, high elastic cords such as aromatic polyamide fiber cords are preferably used, but organic fiber cords such as nylon, polyesters and/or rayons are also useable. The fiber cords ar
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Nishimura Takashi
Oohashi Susumu
Ball Michael W.
Johnstone Adrienne C.
Sumitomo Rubber Industries Ltd.
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