| 摘要 |
PROBLEM TO BE SOLVED: To provide an air tube compatible with both of durability in a runflat state and heat radiation in an air filled state at a high level by making rigidity distribution of the air tube proper and suitable. SOLUTION: The hollow annular air tube 1 is stored in a tire 2 and subrogates supporting of a load from the tire 2 by forming a space S1 between itself and an inner surface of the tire 2 in an air filled state, and by extending its diameter and deforming itself in a runflat state. The air tube 1 is furnished with an air impermeable layer 6 and a supporting layer to closely surround a whole outer surface of this air impermeable layer 6. A lower part area 10 and a lower side side part area 13 of the supporting layer 7 are constituted of a high rigidity part, and an upper side side-part area 12 is constituted of a low rigidity part. A flowing passage to enable the air between a rim 3 and the air tube 1 to flow is provided in a special outer surface region A along an outer surface part 5 making contact with the tire 2 from an outer surface part to make contact with at least the rim 3 on the supporting layer 7. COPYRIGHT: (C)2006,JPO&NCIPI
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