Resilient tires and wheels – Tires – resilient – Cushion and pneumatic combined
Patent
1996-07-25
1999-10-26
Johnstone, Adrienne
Resilient tires and wheels
Tires, resilient
Cushion and pneumatic combined
152456, 152520, 152539, 152544, 152545, 152547, 152550, 152552, 152553, 152375, 152378R, 1523793, 1523794, 152396, 152409, 152410, 152DIG9, 152DIG10, B60B 2110, B60B 2504, B60C 306, B60C 1500, B60C 15024, B60C 1706
Patent
active
059710470
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a tire with radial carcass reinforcement, and more particularly to the structure of the beads of the tire. It also relates to an assembly, formed by a tire and a rim, which rim is either monobloc with seats which may or may not be inclined, or in several sections, some of which are mobile, and possibly provided with a bearing support which may or may not be removable.
A tire with radial carcass reinforcement usually comprises, in known manner, a reinforcing bead wire in each bead, around which bead wire the carcass reinforcement is anchored by winding, forming an upturn. The characteristics of the bead wire, taken in combination with the meridian profile of the radially inner face of the bead and the meridian profile of the corresponding rim seat, ensure what is called the clamping of the bead on the rim. The clamping produces a certain compression of the portion of the bead between the bead wire and the bead seat, the clamping generally being brought about by a difference in the angles of the bead seat and the rim seat respectively, and/or by a difference in the diameters of said seats.
When such a tire is used on a rim having flat or inclined seats, with angles which may vary from 0.degree. to 30.degree., when the rim comprises a flat rim base and a plurality of mobile parts, when the rim is monobloc with a mounting groove, when the seats are inclined towards the inside or towards the outside, the clamping value of the beads on the rim seats, which clamping is necessary for solving the problems relating to the rotation on rim at the normal use pressure of the tire and for maintaining good lateral strength of the beads, becomes so great that difficulties are encountered in mounting such tires on their rims in practically all cases, even sometimes with the use of mounting presses.
Although these presses are common tools which are usual for tire manufacturers or motor vehicle manufacturers, they do not form part of the usual equipment of the garage mechanic who is usually approached when there is a problem relating to the tire, for instance a passenger-coach tire.
SUMMARY OF THE INVENTION
In order to facilitate the mounting and the demounting of a tire on its mounting rim while remedying the problems of rotation on the rim, precise location of the beads on the rim seats and fatigue strength of said beads, the invention proposes a tire, at least one bead of which has a structure permitting modification of the clamping of the bead as a function of the tension of the carcass reinforcement and in particular reinforcement thereof when the inflation pressure increases to its nominal value.
According to the invention, a tire with radial carcass reinforcement, wound in each bead on at least one bead wire to form an upturn, is characterized in that, when mounted on rim and inflated to its service pressure, its carcass reinforcement, viewed in meridian section, is wound in at least one bead about the bead wire coated with a rubber mix, passing from the heel to the toe of said bead, the upturn extending in a profile made of rubber mix in the form of a wedge defined by two sides coming from an apex located beneath the section of the coated bead wire, the radially outer side forming, with a line parallel to the axis of rotation passing through said apex, an acute .phi..sub.1 angle open radially towards the outside, and the radially inner side forming with said parallel line an acute angle .phi..sub.2 open radially towards the inside, the rubber mix forming the profile, axially adjacent to the bead wire, having a Shore A hardness greater than the Shore A hardness(es) of the rubber mixes located axially and radially above the bead wire and the profile.
The outer contour of a tire bead is generally defined by three basic walls: to bear laterally with and on the wall, perpendicular or virtually perpendicular to the axis of rotation, of an element foreign to the tire, an element which in the great majority of cases is a rim flange, axially on the outside of the
REFERENCES:
patent: 903714 (1908-11-01), Hawley et al.
patent: 1261754 (1918-04-01), Baker
patent: 1919911 (1933-07-01), Shoemaker
patent: 2868258 (1959-01-01), Powers
patent: 3301303 (1967-01-01), Travers
patent: 4580610 (1986-04-01), Jackson
Drieux Jean-Jacques
Muhlhoff Olivier
Compagnie Generale des Etablissements Michelin--Michelin & Cie
Johnstone Adrienne
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