Resilient tires and wheels – Tires – resilient – Pneumatic tire or inner tube
Patent
1992-09-03
1994-04-12
Ball, Michael W.
Resilient tires and wheels
Tires, resilient
Pneumatic tire or inner tube
152526, 152533, B60C 918, B60C 920, B60C 922
Patent
active
053017307
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Field of the Invention
This invention relates to tires designed for motorcycles.
Description of the Related Art
The shift to the tire design known under the name of "belted radial" has taken place, for motorcycles, only during the last decade. As explained in an article published in the magazine "Moto Journal," of January 1984, it has been considered that a tire with one or two casing ply(plies) at 90.degree. and a crown ply at 0.degree., constituting a reinforcement construction that is simple and reduced to the essential, could very well be suitable as a rear tire on street motorcycles, even heavy and powerful street motorcycles.
To assure a good behavior for a street motorcycle, it was proposed by patent application FR 2 611 599 to associate, with such a rear tire, a front tire having a radial casing and two crown plies oriented at .+-.25.degree. in relation to the median plane perpendicular to the axis of rotation of the tire.
In this known way, a completely satisfactory solution is provided for most conditions of use of motorcycles. However, in case of very fast driving, especially when the driver undertakes sharp accelerations while turning, when the tires are still in pronounced camber, the rear tire offers an insufficient drive ability, due to a small drift strength.
Numerous constructions have been proposed, without thereby offering appreciable improvement, because if at times one or the other of the properties is improved, it is at the cost of an often considerable degradation of other properties.
SUMMARY OF THE INVENTION
This invention aims at obtaining a considerable improvement in drive ability, without jeopardizing the other performance characteristics of the tire in service, particularly without degrading the behavior on the road of the equipped motorcycles.
According to the invention, the motorcycle tire comprising a central part including the tread, and two sidewalls each extending between one end of the central part and a bead intended to assure hooking on the rim, said central part, seen in radial section, forming approximately an arc, said tire being reinforced by a casing extending from one bead to the other, and by a belt placed in the central part, between the casing and the tread, said belt comprising one or more layers of cards oriented approximately parallel to a plane perpendicular to the axis of rotation and placed on the casing along the entire width of the tread, is characterized in that the belt comprises of, in addition to said layer or layers of cards, and placed radially thereover, a reinforcement containing cords forming an angle .alpha. in relation to a plane perpendicular to the axis of rotation of the tire, and an angle -.beta. in relation to said plane, said angles .alpha. and .beta. being between the values 35.degree. and 55.degree..
Of course, by cord both a single filament and cords or equivalent assemblies of a plurality of filaments must be understood, and this regardless of the material used. An important specific characteristic of this invention is the sequence of the angles made by the various crown reinforcement frameworks in the ordinary sense that is attributed to these angles: 0.degree. for the first crown ply covering the casing ply approximately over a width corresponding to the width of the tread, and finally a reinforcement with crossed angles that are equal to 45.degree..+-.10.degree.. This reinforcement can consist of two plies, the cords of one being oriented along angle .alpha., and the cords of the next being oriented along angle -.beta.. Or further, the reinforcement consists of a twilled fabric ply in which the cords are intertwined, like the warp threads and weft threads of a fabric.
When it is said that the cords are oriented approximately parallel to a plane perpendicular to the axis of rotation, this means that they form an angle of 0.degree. in relation to this plane, or a very slight angle, such as for example the one which results from the winding of a cord or a strip of several cords from one side to
REFERENCES:
patent: 4402356 (1983-09-01), Musy
patent: 4880043 (1989-11-01), Decima et al.
Ball Michael W.
Compagnie Generale de Etablissements Michelin - Michelin & Cie
Johnstone Adrienne C.
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