| 摘要 |
PROBLEM TO BE SOLVED: To improve steering stability and durability at a decrease in the internal pressure of a tire. SOLUTION: The invention relates to an annular support ring 4 made of an elastic body with an inner peripheral surface 4b attached to a wheel rim in the internal void of the tire surrounded by the tire and the wheel rim for rimming the tire, and an outer peripheral surface 4a contacted with the inner surface of a tread part at a decrease in the internal pressure of the tire to bear a load. The width Wo of the outer peripheral surface 4a in the axial direction is larger than the width Wi of the inner peripheral surface 4b in the axial direction. In its meridian cross section, both of the smaller angleαformed by a first line K1 passing through one end EU1 of the outer peripheral surface 4a of the support ring 4 in the axial direction and the end ED1 of the inner peripheral surface 4b in the axial direction on the same side relative to the outer peripheral surface 4a, and the smaller angleβformed by a second line K2 passing through the other end EU2 of the outer peripheral surface 4a in the axial direction and the end ED2 of the inner peripheral surface 4b in the axial direction on the same side relative to the outer peripheral surface 4a make an acute angle. Thus, the cross sectional outline is shaped in an approximate trapezoid with a width in the axial direction increased outward in the tire radial direction. COPYRIGHT: (C)2005,JPO&NCIPI
|
