| 摘要 |
1522964 Pneu matic tyre tread reinforcements MICHELIN ET CIE (COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN) 31 July 1975 [31 July 1974] 32117/75 Heading B7C A pneumatic tyre comprises a tread reinforcement consituted by at least two plies of parallel cords, the cords of the plies or each pair of adjacent plies crossing and the cords of each ply making an acute angle of not more than 45 degrees with the circumferential direction at least at the ply edges, at least one edge of the tread reinforcement extending axially beyond a line 11 joining the adjacent edge of the ground contacting surface of the tread and the sidewall by not more than 50% of half the width of the ground contacting surface of the tread. The extending edge portion is covered by rubber 6, 8 with the rubber 8 having a concave section, and the rubber covering the radially external face of that edge portion does not come into contact with the ground. The rubber 6, 8 may be the same as that of the tread or sidewall or the rubber 8 may have a modulus between 80 and 200 g./mm.<SP>2</SP> at 100% elongation. Dimension "e" may be 1-10% of the halfwidth of the tread. Rubber strips 37 (Fig. 3) may be positioned between the edges of the plies or of adjacent plies. Strengthening ribs 38 may extend radially inwardly from the rubber 8. The extending portion(s) may assist in cooling the tyre. |
