| 摘要 |
1,071,951. Pneumatic tyres. MICHELIN & CIE (COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN). Aug. 4, 1964 [July 23, 1963], No. 30833/64. Heading B7C. In a crown reinforcement for a pneumatic tyre comprising at least two cord plies 42 of which at least one includes a circumferential gap 43 spanned by a cord ply, the gap width does not exceed 20% of the tread width and the spanning ply which overlaps the discontinuous ply on each side of the gap by not more than 20% of the tread width has its cords at an angle to the mid-plane different from that or those of the first two plies; in a modification, the spanning cord ply is replaced by an insert of an elastomer of higher modulus of elasticity than the tread. Both plies may be discontinuous and the gaps may be spanned by plies or inserts arranged symmetrically or asymmetrically of the mid-plane. The spanning plies or inserts may lie between the two cord plies or radially inwardly or outwardly thereof. The cords are preferably steel cables. The tread may have a circumferential groove of axial width I between 10% and 25% of the tread width L and a depth between two-thirds and nine-tenths of the tread thickness. |
