Tyre with laced breaker ply reinforcement

Details Tyre with laced breaker ply reinforcement Tyre with laced breaker ply reinforcement

B - Operations, Transporting

60

C

B60C 9/00 (2006.01) B60C 3/00 (2006.01) B60C 3/04 (2006.01) B60C 9/20 (2006.01) B60C 15/02 (2006.01)

Patent

CA 2332419

The invention concerns a tyre with height/width (H/S) ratio ranging between 0.3 and 0.8, comprising a casing reinforcement (1) whereon is radially mounted a quasi-cylindrical breaker ply reinforcement (3), said casing reinforcement (1) being tangent at T to a so-called catching circle C, the common tangent at T to said circle C and to the casing (1) meridian profile forming relative to a line parallel to the axis of rotation passing through the tangency point T, an angle .alpha. ranging between + 20· and - 80·, and in its part included between said tangency point T and point E of greater axial width, provided with a reinforcement armour (6) made of circumferentially inextensible elements; viewed in meridian cross-section, the casing (1) has a profile, when the tyre is mounted and inflated at its recommended pressure, consisting of four arcs: one first arc TA with radius r'¿1?, tangent to the catching circle C, and having an intersection point A with a second arc AE with radius r''¿1?, tangent to the straight line D perpendicular to the axis of rotation passing through point E of greater axial width, a third arc EF of radius r¿2?, tangent to the second arc AE at point E and tangent to a fourth arc FG, at a point F, distant from the straight line parallel to the axis of rotation passing through the centre O¿J? of circle C by an distance d, the values d, r¿1?, r¿2? satisfying the relationships: d = r¿2? + (r¿1? + ar¿J? + e¿T?) cos .alpha. and r¿1? = r¿2?R¿SS?/R¿SS? - r¿2?, whereas r'¿1? and r''¿1? range between or are equal to the values r¿1? and/or 2r¿1?, and a fourth arc FG of radius R¿TC? equal to a transverse radius R¿T? of the breaker ply reinforcement, reduced by at most the casing reinforcement minimal thickness.

Pneumatique, de rapport de forme H/S compris entre 0,3 et 0,8, comprenant une armature de carcasse (1), surmontée radialement d'une armature de sommet (3) quasi-cylindrique, ladite armature de carcasse (1) étant, d'une part tangente en T à un cercle C dit d'accrochage, la tangente commune en T audit cercle C et au profil méridien de la carcasse (1) faisant par rapport à une parallèle à l'axe de rotation passant par ledit point de tangence T, un angle .alpha. compris entre + 20~ et - 80~, et d'autre part, dans sa partie comprise entre ledit paint de tangence T et le point E de plus grande largeur axiale, pourvue d'une armature de renforcement (6) d'éléments inextensibles circonférentiellement; vue en section méridienne, la carcasse (1) a un profil, lorsque le pneumatique est monté et gonflé à sa pression recommandée, composé de quatre arcs de cercle: un premier arc de cercle TA de rayon r'1, tangent au cercle d'accrochage C, et présentant un point d'intersection A avec un deuxième arc de cercle AE, de rayon r''1, tangent à la droite D perpendiculaire à l'axe de rotation passant par le point E de plus grande largeur axiale, un troisième arc de cercle EF de rayon r2, tangent au deuxième arc de cercle AE au point E et tangent à un quatrième arc de cercle FG, en un point F, distant de la droite parallèle à l'axe de rotation passant par le centre OJ du cercle C d'une quantité d, les quantités d, r1, r2 satisfaisant aux relations: d=r2+(r1+arJ+eT)cos.alpha. et r1=r2RSS/RSS-r2, alors que r'1 et r''1 sont compris entre les ou égaux aux quantités r1 et/ou 2r1, et un quatrième arc de cercle FG de rayon RTC égal au rayon transversal RT de l'armature de sommet, diminué d'au plus l'épaisseur minimale de l'armature de carcasse.

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