Resilient tires and wheels – Tires – resilient – Wheel securing means
Patent
1992-03-06
1993-08-03
Stormer, Russell D.
Resilient tires and wheels
Tires, resilient
Wheel securing means
1523814, 152394, B60C 516
Patent
active
052320324
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to tires without independent inner tube intended to be mounted on rims having seats which are inclined to the axis of rotation of the mounted tire by an angle of 15.degree..+-.1.degree. in accordance with the existing standards.
Such a tire has a radial carcass reinforcement anchored in each bead to at least one bead ring, generally formed of wires of rectangular cross section. Axially to the outside of the upturned part of the carcass reinforcement, there is a ply of cords or cables forming an angle of about 20.degree. with the circumferential direction, this ply being intended to make the portion of the bead concerned rigid.
During the life of the tire, the portions of rubber in contact with the rim become worn by rubbing, particularly as foreign particles are frequently present between the rubber and the metal of the rim (sand, dirt, etc.). Furthermore, these portions are subjected to substantial heating, which may be so great that the rubber which is directly in contact with the rim hardens and "bakelites". Upon the recapping of the tread of the tire after travelling a number of miles, these damaged portions of bead can be repaired by the addition of rubber. These repair operations are complicated, lengthy and expensive.
In order to overcome these drawbacks, the invention proposes replacing the tire normally mounted on a rim with 15.degree. frustoconical seats by an assembly formed of a tire and a reinforced removable bead protector capable of assuring proper mounting of the tire and the required tightness, it being easily replaced after deterioration upon travel.
In accordance with the invention, the tire assembly formed of a tire without inner tube, comprising a tread, a tread reinforcement, a carcass reinforcement anchored in each bead on at least one bead ring and removable protector, which assembly is intended to be mounted on a rim with 15.degree. frustoconical seats and standard dimensions, is characterized by the fact that the removable protector which is intended to be inserted between the bead of the tire and the part of the rim formed of the seat and the rim lip, is a circular ring of reinforced rubber, of a width at least equal to the width of the frustoconical seats of the rim, and
the radially inner profile of which, seen in meridian section, is identical to the corresponding profile of the service rim of the tire up to the top of the rim lip of diameter D.sub.J, but the points of which furthest from the axis of rotation of the tire are on a circle of diameter D.sub.B perpendicular to the axis of rotation, which is between 0.9 and 1 times the diameter D.sub.J of the rim lip,
the radially outer profile of which is formed of a frustoconical zone the generatrix of which is parallel to the radially inner generatrix, located at a distance (e) from said generatrix, (e) being between 2 mm and 10 mm, and extended axially towards the outside by a zone in the form of a circular arc having a radius equal to the corresponding radius of the zone of the inner profile, said circular-arc zone being tangent to a frustoconical zone the generatrix of which forms an angle .beta. of between 45.degree. and 90.degree. with the axis of rotation of the tire, this frustoconical zone being itself connected to the radially inner profile by a substantially circular zone surrounding at least one ply of cords or cables which are oriented at an angle of between 90.degree. and 45.degree. with respect to the circumferential direction and forming two reinforcement layers extending at least up to the axially inner point of the protector, after winding around a bead ring of a modulus of extension at least equal to 4000 MPa, located in the part of the removable protector intended to cover the rim lip, such that the ratio ##EQU1## is at least equal to 0.1, D.sub.T being the inner diameter of the bead ring of the removable protector, and by the fact that the tire has beads the base of which of axial width at most equal to the axial width of the removable protector is formed, seen in meridian sectio
REFERENCES:
patent: 4108232 (1978-08-01), Simpson
patent: 4373567 (1983-02-01), Declercq
patent: 4422490 (1983-12-01), Power
patent: 4658876 (1987-04-01), Augier
Abstract of Japanese Appl. No. 60-99047 of Sumitomo Rubber Ind Ltd., vol. No. 111 (M-578) [2558] Apr. 8, 1987.
Compagnie Generale des Etablissements Michelin - Michelin & Cie
Stormer Russell D.
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