Trapezoidal non-pneumatic tire with supporting and...

B - Operations – Transporting – 60 – C

Patent

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152/64

B60C 7/08 (2006.01) B60C 1/00 (2006.01) B60C 7/12 (2006.01)

Patent

CA 2011473

A trapezoidal non-pneumatic tire ("TNPT") is integrally molded from a stiff, resilient elastomeric material with particular specifications, to form a unitary structure comprising outer and inner cylindrical coaxial members ("hoops"), the outer being wider than the inner. The outer hoop is supported and cushioned by a plurality of circumferentially spaced apart, planar rib members (ribs) and a planar central web member (web) which connects the hoops at their circumferential center lines. The web lies in a plane perpendicular to the rotational axis of the TNPT. The ribs extend axially along the inner and outer hoops, connecting them, and the edges of the ribs lie along the opposite faces of the web. The ribs are angled in the range from 15° to 75° to radial planes which interesect them at their radially inner ends, and the ribs on one side of the web are angled oppositely from those on the other. A rubber tread is secured to the outer surface of the outer hoop. The coaction of the structural elements of the TNPT provides a load-supporting structure which, in operation, is subjected to continuous compression and tensile forces as it travels over the ground. Deformation and buckling characteristics of the TNPT are derived from its unique trapezoidal shape which results in an interaction of the structural elements such that the outer hoop is not pulled under the wheel as much as the outer hoop would have been, had the shape of the TNPT been rectangular. The trapezoidal shape provides the TNPT with improved "handling" characteristics in hard turns without sacrificing a "ride" which is surprisingly similar to that of a conventional pneumatic tire.

Pneu trapézoïdal non pneumatique (PTNP) moulé intégralement à partir d'un matériel élastomère rigide et élastique aux caractéristiques particulières, de manière à former une structure monobloc comprenant des éléments cylindriques coaxiaux interne et externe (cerceaux). Le cerceau externe est plus grand que le cerceau interne, et il est supporté et amorti par de nombreuses nervures plates (côtes) espacées sur la circonférence, et par une bande centrale plate (bande), qui relie les cerceaux, sur la ligne centrale de leur circonférence. La bande est disposée sur un plan perpendiculaire à l'axe de rotation du PTNP. Les nervures sont disposées dans l'axe le long des cerceaux interne et externe, de manière à les relier, tandis que les extrémités des nervures se trouvent sur les côtés opposés de la bande. Les nervures forment un angle se situant entre 15 et 75 degrés par rapport à des plans radiaux, qui les croisent à leurs extrémités radiales internes. Les nervures situées d'un côté de la bande forment des angles opposés aux angles des nervures de l'autre côté. Une bande de roulement en caoutchouc est fixée sur la surface extérieure du cerceau externe. L'action conjuguée des éléments structuraux du PTNP résulte en une structure qui, pendant son utilisation, est soumise à des forces de compression et de tension continuelles quand le pneu roule sur une surface. Les caractéristiques de déformation et de plissement du PTNP résultent de sa forme trapézoïdale unique, qui permet aux éléments structuraux d'interagir de sorte que le cerceau externe n'est pas tiré sous la roue autant que si le PTNP avait été rectangulaire. La forme trapézoïdale du PTNP lui permet d'améliorer ses caractéristiques de tenue de route dans les virages serrés, sans sacrifier la douceur de la conduite, qui est étonnamment similaire à celle d'un pneumatique classique.

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