Resilient tires and wheels – Tires – resilient – Wheel securing means
Patent
1992-07-22
1994-06-07
Stormer, Russell D.
Resilient tires and wheels
Tires, resilient
Wheel securing means
1523814, B60B 2102
Patent
active
053180887
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an integral rim with frustoconical seats inclined 15.degree..+-.1.degree. on which it is intended to mount a tire of the "heavy vehicle" type without independent air tube. It also concerns one assembly of such a rim with a tire, the beads of which have seats of adapted shape.
Such known assemblies, which are very widely used, have significant advantages: the danger of the throwing off of metal parts being eliminated, greater safety is assured; as the tires used are tires without independent air tube, the absence of the latter and of the flap results in a substantial saving, while avoiding rubbing and pinching between tire, tube and rim, and thus heating and puncture of the inner tube.
The known rims with 15.degree. inclined seats have dimensions which are standardized in accordance with the international standards in force (T.R.A.; ETRTO). Tires having beads with frustoconical seats are mounted on such rims in known manner. The generatrix of a seat is either linear forming an angle of generally between 15.degree. and 20.degree. with the axis of rotation of the tire, or is formed of two segments, one inclined 15.degree. and the other, which extends the first axially towards the inside, being inclined by an angle of more than 15.degree., and even more than 25.degree.. The standard rims are provided in their central portion with a so-called mounting groove which permits the mounting of the tire on the rim. The radially inside diameter of this groove is a major obstacle to the selection of brake drums or disk brake calipers of large diameter, which would permit greater braking efficiency.
Any increase in the diameter of the mounting groove without any other change, either of the beads of the tire intended to be mounted or of the other parts of the rim, makes the mounting of the tire practically impossible.
SUMMARY OF THE INVENTION
The object of the invention is to be able to increase the diameter of the mounting groove of standard rims having inclined seats of 15.degree. and nevertheless permit the mounting of ordinary tires having beads the frustoconical seats of which are adapted to standard rims.
The rim J', in accordance with the invention, of standard nominal diameter D.sub.N and standard axial width A and having seats inclined by an angle of 15.degree..+-.1.degree. with respect to the axis of rotation is characterized by the fact that, seen in meridian section, the axial width P' of each of its seats is between 35% and 55% of the standard minimal width P of each of the frustoconical seats of the standard rim J having the same nominal diameter D.sub.N and the same axial width A, and by the fact that its mounting groove has a depth H' between 65% and 75% of the depth H of the mounting groove of the reference rim J, said groove of the rim J' being connected on the mounting side of the tire directly to the frustoconical seat and, on the side opposite the mounting side of the tire, to a cylindrical part of diameter identical to the diameter of the cylindrical part of the reference rim J, said cylindrical part being connected to the frustoconical seat by two axially adjacent circular arcs of the same radius.
If such a rim permits the mounting of present-day tires having beads with frustoconical seats, the generatrices of which form either a single angle or two different angles with the axis of rotation, the assembly formed by the rim described above and a tire, the beads of which have seats of adapted shape is particularly advantageous.
In accordance with the invention, said assembly comprises a tire having bead seats of a diameter at most equal to the diameter D.sub.N of the mounting rim and the meridian profile of which is formed of a portion inclined by an angle of between 15.degree. and 20.degree. and of an axial width L.sub.0 of between 90% and 110% of the width P, of the rim seat J', which portion is extended axially towards the inside by a portion forming an angle of between 5.degree. and 0.degree. with the axis of rotation of the assembly
REFERENCES:
patent: 2731064 (1956-01-01), Powers
patent: 5186772 (1993-02-01), Nakasaki et al.
Patent Abstracts of Japan, vol. 14, No. 393 (M-1015) [4336] Aug. 24, 1990, umitomo Rubber Ind. Ltd., Jun. 6, 1990.
Patent Abstracts of Japan, vol. 8, No. 16 (M-270) [1453] Jan. 24, 1984, Bridgestone Tire K.K., Oct. 18, 1983.
Compagnie Generale des Etablissements Michelin - Michelin & Cie
Stormer Russell D.
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