Patent ID: 8281836
Filing Date: 2012-10-09
Classification: B60C,Y10T

Abstract:
1. A run flat tire comprising: a carcass layer laid between bead cores buried respectively in a pair of left and right bead portions; hard rubber layers each having a substantially crescent shape in a cross section, and being disposed respectively in sidewall portions; and three belt layers disposed on an outer circumferential side of the carcass layer in a tread portion, wherein; as to the three belt layers, an innermost belt layer extends in one cord direction at a cord angle α set at 15° to 30° with respect to a circumferential direction of the tire, a cord angle β of an intermediate belt layer with respect to the circumferential direction of the tire is set at not less than 40° , and a cord angle γ of an outermost belt layer with respect to the circumferential direction of the tire is set at 45° to 70°, the innermost belt layer is disposed directly on the carcass layer, the intermediate belt layer is disposed directly on the innermost belt layer, the outermost belt layer is disposed directly on the intermediate belt layer, and a belt cover layer is disposed directly on the outermost belt layer, the cord direction of the innermost belt layer and a cord direction of the intermediate belt layer are arranged to be inclined respectively in directions opposite to each other with respect to an equatorial plane of the tire, and the cord direction of the intermediate belt layer and a cord direction of the outermost belt layer are arranged to be inclined in the same direction with respect to the equatorial plane of the tire.