Rolling assembly for a tire having beads with frustoconical base

Resilient tires and wheels – Tires – resilient – Wheel securing means

Patent

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Details

1523794, 1523814, B60C 1502

Patent

active

052320340

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to a rolling assembly formed of a tire, a rim, and annular elements, known as tire-rim adapters, mounted between the beads of the tire and the rim.
In order to avoid the possible handling of a large number of metal parts in mounting a "heavy-vehicle flat-seat" tire on its service rim, rolling assemblies have been proposed which comprise, on the one hand, a monoblock rim, in particular a "15.degree. seat" rim and, on the other hand, a tire the beads of which have seats inclined by a angle generally greater than 15.degree. with respect to the axis of rotation of the tire.
These rolling assemblies have great advantages. The danger of the throwing off of metal parts being eliminated, greater safety is assured; the tires used being tubeless tires, the absence of a tube and flap results in substantial savings while avoiding rubbing between tube and tire and thus heating and blowout of the inner tube. The ease of mounting and removal is increased and the balancing of the rotating assembly is improved by the elimination of the imbalances due to the tube, flap and mounting rings.
The rims with inclined seats of 15.degree. have a mounting groove in their central part. The radially inner diameter of this groove is a major obstacle to the selection of the brake drums or calipers of disc brakes of larger diameter, which would permit greater braking efficiency. Furthermore, due to the presence of the central groove, the manufacture of a rim with inclined seats requires particular care in order to avoid problems of fatigue of the metal forming it.
Although the assemblies consisting of 15.degree. seat rim and corresponding tire are most widely used, it is to be noted that there are also rims with frustoconical seats inclined at an angle of 5.degree. which have the same advantages and are subject to the same drawbacks.


SUMMARY OF THE INVENTION

In order to remedy the drawbacks mentioned while retaining the advantages obtained by the use of a rolling assembly formed of a rim with inclined seats and of the tire with frustoconical bead bases which is intended to be mounted on said rim, the invention proposes a rolling assembly composed of the tire itself, mounted by means of annular adapters on a single-piece rim the base of which is parallel to the axis of rotation and the rim flanges of which are fixed. As the annular adapters of the assembly have a radially outer face which is different from the radially inner face, and in order to avoid deformation of the vulcanized rubber forming the adapter as a result of the intense compressive forces which it must experience both in statics and in dynamics, it is necessary to reinforce these adapters meridionally and circumferentially.
In accordance with the invention, the rolling assembly formed of a tire P, a rim J and two independent annular adapters S.sub.1, S.sub.2 inserted between the beads of the tire P and the rim J, the tire P being a tire of standard size without independent inner tube, intended for use on a standard rim J' having frustoconical seats and rim flanges of height H, is characterized by the fact that
- the service rim J, intended to receive the adapters S.sub.1, S.sub.2, has no mounting groove and formed primarily of two rim flanges of height H and a cylindrical rim base the diameter .phi..sub.JS of which is such that ##EQU1## .phi..sub.SE being the nominal diameter of the rim J' normally used for the tire P and K being the axial distance between the top of the rim flange and the end of the cylindrical rim base, while the width W of the rim J is between 1.05 and 1.10 times the width A of the rim J', and,
- by the fact that each adapter S.sub.1, S.sub.2 has an outer contour adapted, on the one hand, to the contour of the rim J on which it rests and, on the other hand, to the contour of the bead of the known tire P and is formed of a vulcanized elastomeric material C of an elastic modulus of compression at least equal to 8 MPa, which material is surrounded by a reinforcement formed of at least one ply of

REFERENCES:
patent: 4373567 (1983-02-01), Declercq
patent: 4422490 (1983-12-01), Power
patent: 4658876 (1987-04-01), Augier

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