Pneumatisk dæk til køretøjshjul.

摘要

907,045. Pneumatic tyres. PIRELLI S.p.A. June 15, 1960 [Nov. 10, 1959], No. 21034/60. Class 144 (2). In a breaker for a pneumatic tyre in which two superimposed layers 2, 3 of reinforcing cords constitute at least the radially outermost portion of the breaker and the cords in each layer are parallel to one another and inclined to the mid-circumferential plane of the breaker, the cords of the radially outer layer 2 are inclined to the cords of the underlying layer 3 at an angle which is greater than the angle between the cords of each layer and the midcircumferential plane, the medial line of the radial outer layer 2 is coincident with the mid circumferential line of the breaker and the radially outer layer 2 has a width L1 which is less than half the width L11 of the underlying layer 3. The width L1 of the cords of the outer layer 2 is between a quarter to a half the width of the underlying layer 3. The cords of the outer layer 2 may be symmetrically inclined to the cords of the underlying layer 3 with respect to the mid-circumferential plane of the breaker or alternatively the cords of the outer layer 2 may be inclined at a smaller angleαthan the angle # of the underlying layer 3 to the mid-circumferential plane of the breaker. The difference between the anglesαand # between the cords of the layers 2 and 3 and the mid-circumferential plane of the breaker is below 15 degrees. One or more further layers 4, Fig. 5, may be provided below the layers 2, 3 and the cords in each such layers 4 are parallel to one another and inclined to the mid-circumferential plane of the breaker, which angle or angles may be the same as or smaller than the angles of inclination of the cords of the outer layer 2 or layers 2 and 3. The carcass 1 may be constituted by a single or multiple ply of radially disposed cords or at least one pair of plies in which the cords of one ply are symmetrically disposed to the cords of the other ply.