Rim, supporting ring and assembly thereof

Details Rim, supporting ring and assembly thereof Rim, supporting ring and assembly thereof

1996-05-31

1998-08-04

Stormer, Russell D.

Resilient tires and wheels

Tires, resilient

Wheel securing means

1523814, 1523815, B60B 2102

Patent

active

057879508

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to the production of an integral mounting rim for a tire, preferably with radial carcass, which rim may possibly form, with a supporting ring for the tread and said tire, a rolling assembly which can be used in the event of travelling when the inflation pressure drops abnormally with respect to the nominal pressure of use, called service pressure, when the inflation pressure may even become zero.
The main difficulties encountered when driving with a flat tire or tire with low pressure relate to the risks of unwedging of the beads of the tire, and in particular the unwedging of the bead located on the outside of the tire mounted on the outside of the vehicle. The well-known techniques proposed for avoiding such unwedging, and in particular that consisting of arranging a projection or hump of low height axially on the inside of the outer rim seat, do not seem to give complete satisfaction, and tend to increase the difficulties of mounting and removing tires.
One solution which is capable of being applied to the problem of unwedging of beads is that described in French Patent 1139619, which relates to an assembly formed of a tire and a rim such that the flexible edges of the tire, in contrast to conventional beads, under the effect of the inflation pressure hug tightly the rim stops intended to keep said edges spaced apart from each other. This solution requires a tire structure which is at the very least special and not in conformity with the compromise of properties required for a current tire.
Some prior solutions advocate the addition of a bearing support, integrated or attached and fixed by any available means, to a rim as described previously. Be it with hump or without hump, assemblies comprising rims with bearing support are known, and German application 3626012 and French application 2560121 disclose such assemblies. However, their use has not become widespread because, despite the progress made, there are also difficult mounting problems. The French application referred to above describes a mounting process which makes it possible to eliminate numerous difficulties: the tilting and the ovalisation of one of the beads of the tire permit the passage of the rim, provided with its bearing support on the inside of the tire if said rim is positioned with its axis of rotation perpendicular to the axis of rotation of the tire, the beads then being placed on their respective rim seats with the aid of the mounting grooves located axially on either side of the bearing support.
If the overall width of the mounting rim measured axially between the ends of the two flanges is designated S, D.sub.J is the diameter of the rim measured at the level of the intersection between the rim flange and the frustoconical generatrix of the rim seat, the latter being viewed in meridian section, H' the height of the support measured with respect to the line parallel to the axis of rotation of the rim passing through said point of intersection, and D.sub.T the diameter of the bead of the tire measured on a line parallel to the equatorial plane of the tire, which line passes through the centre of the bead wire, the method described above cannot be applied in the case in which the quantity 2.pi.D.sub.T is less than 2(D.sub.J +2H'+S), which is why it is impossible to have at one's disposal tires having a conventional shape ratio with an effective internal support.
Furthermore, the rims to which these applications relate comprise mounting grooves. A mounting groove, serving for mounting the beads of the tire on their respective rim seats, has a depth and an axial width which is a function of the axial width of the beads, of the internal diameter of any reinforcement rings of said beads, and if applicable of the width of the supporting surface of the rim intended to receive any supporting ring of the tread.
The depth of a groove may in certain cases appear to be excessive in that it greatly reduces the free space intended for the mechanical travelling and in particular braking

REFERENCES:
patent: 3405755 (1968-10-01), Verdier
patent: 4246950 (1981-01-01), Welter
patent: 4572265 (1986-02-01), Lescoffit
patent: 4606390 (1986-08-01), Shute
patent: 5000241 (1991-03-01), Patecell

Affiliated with

Also associated with

Rating

Rim, supporting ring and assembly thereof does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Rim, supporting ring and assembly thereof, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rim, supporting ring and assembly thereof will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1167589