| 摘要 |
The pneumatic tire, with a height:width (H:S) ratio of 0.3-0.8, on a meridian section view has a center line for each main part of the carcass (1) with a meridian profile, when inflated and fitted to the wheel rim, composed of four arcs of a circle. The carcass has a locking circle shape round the wheel rim. The first circle arc has a radius (r'1) between or equal to the radii r1 and/or 2r1. In part, it is at a tangent to the circle round the wheel rim which is concentric with a radius (rJ) to the rim circle radially over the rim with a gap (eT) at least twice the minimum thickness (e) of the carcass, and with an intersection (A) with a second arc. The second arc has a radius (r1) between the values of r1 and 2r1, at a tangent to the line at right angles through the rotary axis, passing the point of the largest axial width. The third arc has a radius (r2) at a tangent to the second arc at the point of largest axial width and at a tangent to a fourth arc, parallel to the quasi-cylindrical crown (3) at a point offset from the line parallel to the rotary axis through the center of the wheel rim circle by a gap (d) from the crown. The values meet the equations: d = r2+(r1+arJ+eT)cos alpha and r1 = r2RSS/RSS-r2, where alpha is an angle to form the tangent with one parallel to the rotary axis, a is a constant for values of -1 or 0 or +1, and RSS is the equatorial radius. The fourth arc has a radius (RTC) equal to the lateral radius (RT) of the crown, reduced to the most minimum thickness (e) of the carcass. The width of the crown (3) is between the gap separating the two tangent points of the meridian profile of the crown reinforcement (3) and the gap augmented by 2r2/3. The crown reinforcement (3) has a continuous axial layer (30), with non-stretch reinforcements round the circumference, together with two layers (31,32) with non-stretch reinforcements parallel to each other and crossing from one layer to the other, forming an angle of 40-55 deg with the circumference line. The carcass reinforcement is formed by radial reinforcements (6) at the sides of the equatorial plane (X-X'). It is radially between the tangent at the circle round the wheel rim and the largest axial width point, and is non-stretch round the circumference to form a simple known triangle. The reinforcements (6) are in a layer of preferably metal elements, which are non-stretch round the circumference. The axial gap between the two tangent points of the meridian profile of the carcass (1) at two wheel rim circles (c) is less than two-thirds of the maximum axial width of the carcass (1). The tire carcass (1) is anchored in each wheel flange by at least one rim wire (2) where the carcass is turned round (10) it. The turn (10) has a length to give integration into the reinforcement (6). The carcass (1) is locked into the wheel flanges by the insertion of the carcass between two non-stretch reinforcements round the circumference, or between the rims and a reinforcement. The tire carcass (1) forms a closed torus. |
