| 摘要 |
PURPOSE:To reduce the rolling resistance without sacrificing other performance by optimizing the radial profile of the carcass in which the ratio of the radius of the curvature of the shoulder contour and the radius of the reference arc which is established by preset procedures. CONSTITUTION:The following reference designations are made: B is the point of intersection of the line which is drawn from the separation point A of rim 7 under the standard inflation pressure and is parallel to the tire rotation axis, and the carcass 3. C is the point of intersection of the vertical line passing through the point B and the carcass 3. D is the middle point of the line segment BC. E is the point of intersection of the line perpendicular to the line segment BC and the line passing through the point F which is outermost point of tire and parallel to the line segment BC. G is the point of intersection of the line passing through F and perpendicular to the line segment BC and the line segment BC. H is the middle point of the line segment GC. I is the point of the intersection of the perpendicular line passing through H and the carcass 3. The ratio of the radius R of the circle which passes through F, I and C to the radius of R' of the circle which passes through B, E and C is made to be 0.65-0.85 and the distance between the two curves at the shifting curvature point is set within 5-10mm.. By this arrangement, the rolling resistance can be improved without sacrificing other characteristics. |
