| 摘要 |
PROBLEM TO BE SOLVED: To sufficiently exert the load supporting capacity, the durability or the like of an airbag by tightly fitting the airbag over the entire inner surface of a tire. SOLUTION: This airbag is accommodated in a tire 2, filled with the internal pressure P2 , expanded and deformed as the internal pressure P1 in the tire is dropped, and supports the load in place of the tire 2. The 30% modulus of a side wall part and a side area 10 facing an inner surface of a bead part 6 is set to be a reference value. The 30% modulus of a crown area 11 facing an inner surface of a tread part 4 is set to be >=3 times the reference value except a center part 12 in the width direction. The 30% modulus of the center part 12 is set to be smaller than that of an adjacent part by >=1/2 of the reference value, and the 30% modulus of a base area 8 corresponding to a bead base 6 of the tire 2 is set to be >=2 times the reference value.
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