Resilient tires and wheels – Tires – resilient – Pneumatic tire or inner tube
Patent
1987-07-02
1989-03-14
Ball, Michael W.
Resilient tires and wheels
Tires, resilient
Pneumatic tire or inner tube
B60C 1504
Patent
active
048117722
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a pneumatic tire which is designed for vehicles and which comprises a toroidally bowed body, with beads formed on it, a multi-part annular core in each bead and a cord or carcass ply the ends of which are conducted through respective ones of the multi-part cores.
In pneumatic tires for vehicles there is a problem with regard to how the necessary cord plies or textile reinforcements should be connected to the cores which are embedded in the material of the bead of the tire. It is usual to fold the cord ply around the core and to lead the free ends of it back into the region of the side wall of the tire. This results in the drawback that the side walls of the tire are relatively stiff in the region of the bead because they are made thicker, by the presence of the folded-back textile reinforcement, than is necessary for the stability of the tire. This in its turn leads to a reduced elasticity of the tire in the region of its side walls. Moreover the exposed selvages of the bead envelope represent a danger to the durability of the carcass in the region of the side walls of the tire.
Attempts have been made to solve this problem by making the rings or cores embedded in the bead and formed of a number of threads joined together in a divided or multi-part form, passing the cord ply or textile reinforcement between the two parts of the bead ring or core and connecting it to the rings or cores in a material manner (DE-OS No. 2 408474). It is true that in this way it is possible to avoid folding back the cord ply in the region of the bead and thereby to avoid unnecessary thickening of the side walls of the tire, but there is no certainty that the cord ply or reinforcement is connected sufficiently securely and permanently to the rings or cores in the beads. Moreover the uniform distribution of material within the bead ring profile forming the basis of the carcass, which is necessary for perfect roundness, is lacking.
A further problem in the vehicle pneumatic tires known hitherto lies in the fact that the position of the bead rings or cores within the bead region is not capable of being sufficiently accurately controlled and corresponding non-uniformities and in fact unbalanced effects arise, these being particularly undesirable in tires designed for high speeds.
The invention is based on solving the problem of improving the known pneumatic tires for vehicles in such a way that they can have a greater elasticity in the side wall region without the anchorage between the cord plies and the bead rings or cores being adversely affected, whilst at the same time the bead rings or cores should be more true to form and their position in the beads should be more accurately determined than has been possible hitherto and the weight and cost should be capable of reduction without having to lose the flexibility necessary for fitting.
This problem is solved according to the invention in that each bead ring or core is made up of mutually locating mechanically interengaging shaped rings between which a respective end of the cord ply or textile reinforcement lies, so that the cord ply is connected to the bead rings or cores not only in a material manner or by force, but also mechanically. In this way one obtains a rigid and permanent anchorage between the cord ply and the bead rings or cores in which the extent of the cord plies inserted between the two bead rings or cores is uniform at any peripheral point in the carcass of the tire without the cord plies having to be passed around the bead rings and conducted back with their ends in the side walls of the tire. On the contrary the cord plies can terminate in the region of the bead rings or cores without any fear of deficient anchorage between the bead rings and the plies. As the bead rings or cores are made up of mutually co-operating shaped rings and not, as hitherto, of wire loops, they have an improved truth to form and allow themselves to be positioned in the bead region of the tire more accurately than was hitherto possible and they fully maintain thei
REFERENCES:
patent: 1009192 (1911-11-01), Sloper
patent: 1234142 (1917-07-01), Dickinson
patent: 1234143 (1917-07-01), Dickinson
patent: 1492256 (1924-04-01), Maranville
patent: 1527700 (1925-02-01), Pennington
Ball Michael W.
Knable Geoffrey L.
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