| 摘要 |
1,056,771. Pneumatic tyres. COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN RAISON SOCIALE MICHELIN & CIE. Jan. 23, 1964 [Feb. 1, 1963; Nov. 7, 1963], No. 3061/64. Headings B7C. A pneumatic tyre is provided with a carcass which is constructed so that it has annular midsidewall portions of a radial height of between one-quarter and one-half the radial height of the carcass, said sidewall portions being less stiff than the portions extending therefrom to the tread and to the beads so as to concentrate the radial flexibility of the tyre in its midsidewall portions. The carcass may comprise two plies 6, 7 of radially extending cords. The radially inner and outer portions of the sidewalls 2 are stiffened by means of inserts 50, 51 of an elastomer of greater modulus of elasticity than the carcass, said inserts being arranged between the carcass plies. In another embodiment, Fig. 11, the radially outer portions of the sidewalls are stiffened by the extension of the tread reinforcing plies 110, 111 into those portions, while each insert 50 is replaced by a ply of parallel metal cords which is wrapped around the bead wire 4. The radial heights h, k and l of the mid-sidewall portions, the radially inner and outer sidewall portions respectively are limited in the following ways: where H is the radial height of the carcass measured from the beads 4 so that |
