| 摘要 |
1,167,103. Pneumatic tyres. SOC. "FIVEREL." 11 Jan., 1968 [18 Jan., 1967], No. 1716/68. Heading B7C. [Also in Division Dl] Pneumatic tyres are provided with a reinforcement below the tread which consists of (a) a belt of one or more layers of cords, twisted single yarns, or threads, of continuous glass filaments, each of which is enclosed in an elastomeric sheath, the cords, twisted single yarns or threads having a corrected coefficient of twist of more than 80; and (b) a core of at least one elastomeric layer having a Shore hardness of at least 70 located between the carcass plies and the belt. The corrected coefficient of twist C 1 is defined by the formula where T is the twist expressed in turns per metre and Nm is the metric count. Other elastomeric layers having a Shore hardness of at least 70 of the core may be located between the layers of the belt and/or radially outward thereof. The total radial thickness of the core ranges from 1-6 mm. |
