Resilient tires and wheels – Tires – resilient – Cushion and pneumatic combined
Patent
1996-06-03
1998-05-12
Johnstone, Adrienne C.
Resilient tires and wheels
Tires, resilient
Cushion and pneumatic combined
152454, 152520, 152539, 152544, 152548, 152375, 152378R, 1523793, 1523794, 1523813, 1523814, B60B 2102, B60B 2110, B60C 300, B60C 1706
Patent
active
057499829
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to the production of mounting rims, preferably integral rims, for tires, preferably radial tires, and forming assemblies with the tires and optionally with tread support rings, certain of which may prove useful for running in situations where the inflation pressure is abnormally reduced compared with the nominal pressure of use, termed the operating pressure, the inflation pressure even being capable of becoming zero.
The main difficulties encountered when running flat or at low pressure relate to the risk of unseating the beads of the tire, particularly the risk of unseating the bead situated on the outside of the tire mounted on the off-side of the vehicle. The techniques which have been proposed, and which are well known, for preventing unseating such as this, particularly the technique consisting of providing a shoulder or hump of low height axially inwardly of the outer seat of the rim, tend to increase the difficulties associated with the fitting and removal of tires.
One solution which is intended to be applied to the problem of beads becoming unseated is that described in French Patent 1139619, which relates to an assembly formed from a tire and a rim such that in contrast to the usual beads the flexible edges of the tire exert a tight grip, under the action of the inflation pressure, on rim stops intended to keep the said edges spaced apart from each other. This solution requires a carcass reinforcement which is at least special and which does not comply with the compromise of properties required for a present-day tire.
Certain previous solutions advocate the addition, to a rim as described previously, of a bearing support, which is either integral or is mounted and fixed by any available means. Assemblies comprising rims with a bearing support are known, both with a hump and without a hump, and German Application 3 626 012 and French Application 2 560 121 disclose assemblies such as these. However, they have not been generally used because difficult fitting problems arise despite the progress made. The above-mentioned French Application describes a fitting procedure which enables numerous difficulties to be eliminated: tilting over one of the beads of the tire and ovalizing it enable the rim, which is provided with its bearing support, to pass inside the tire if the rim is offered with its axis of rotation perpendicular to the axis of rotation of the tire casing, the beads subsequently being placed on their respective rim seats with the aid of mounting grooves situated axially on both sides of the bearing support.
If the overall width of the mounting rim measured axially between the ends of the two flanges is termed S, D.sub.J is the diameter of the rim measured at the level of the intersection between the rim flange and the tapered generatrix of the rim seat, the latter being viewed in meridional section, H' is the height of the support measured with respect to the line parallel to the axis of rotation of the rim and passing through the point of intersection, and D.sub.B is the diameter of the bead of the tire measured on a line parallel to the equatorial plane of the tire, which parallel line passes through the center of the bead ring, the method described above is not applicable in the situation where the quantity 2.pi.D.sub.B is less than 2(D.sub.J +2H'+S), whence it is impossible to provide tires of the usual shape ratio with an effective inside support.
SUMMARY OF THE INVENTION
The present Application relates to solutions which are different from those disclosed in the above-mentioned Application, which similarly enable the conditions of operation and use of a radial tire to be improved when running at zero pressure or at low pressure whilst providing improved protection from impacts due to pavements, the solutions relating both to rims and to the assemblies formed by the rims and tires adapted to such rims, with or without a removable or non-removable tread support ring.
For this purpose, and according to the invention, a rim in
REFERENCES:
patent: 2868258 (1959-01-01), Powers
patent: 3405755 (1968-10-01), Verdier
patent: 4406316 (1983-09-01), Okamoto
patent: 4572265 (1986-02-01), Lescoffit
patent: 4606390 (1986-08-01), Shute
patent: 5139067 (1992-08-01), Shiozawa et al.
Muhlhoff Olivier
Pompier Jean-Pierre
Compagnie Generale des Etablissements Michelin - Michelin & Cie
Johnstone Adrienne C.
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