| 摘要 |
Provided is a run-flat support body (1) for a pneumatic tire, in which an outer peripheral side of an annular shell (2) serves as a support surface for supporting an inner surface of the tire (T); an inner peripheral side of the annular shell (2) straddles in the form of a bifurcation; elastic rings (3) and (3) are attached respectively to two leg parts (2b) and (2b) of the annular shell (2); and the annular shell (2) is supported on a rim (Rm) of a wheel with the elastic rings (3) and (3). The elastic rings (3) and (3) are composed of a composite elastic material formed by compounding reinforcement fillers in an elastic material. Accordingly, compressive rigidity of the elastic rings in a radial direction of the tire is made larger than that of the unreinforced elastic rings in the tire radial direction, the unreinforced elastic rings being composed of a single elastic material in which the reinforcement fillers are not compounded. Moreover, bending rigidity of the elastic rings in an axial direction of the tire is made substantially equal to that of the unreinforced elastic rings in the tire axial direction, the unreinforced elastic rings being composed of a single elastic material in which the reinforcement fillers are not compounded.
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