AIRBAG FOR SAFETY TIRE, SAFETY TIRE USING IT, AND MANUFACTURING METHOD OF AIRBAG

摘要

PPROBLEM TO BE SOLVED: To provide an airbag for a safety tire, the safety tire using it, and a manufacturing method of the empty envelope which improve durability and weight balance by making the thickness of a hoop-reinforcing layer uniform both in the circumference and in the width direction. PSOLUTION: The hollow tubular airbag 1 is housed in the tire 2, and air is charged into the airbag in relation to the predetermined air pressure of the tire 2. A space SSB1/SBis formed within the tire 2 when the internal pressure of the tire 2 is in a normal state. Then at the time when the internal pressure of the space SSB1/SBof the tire 2 suddenly drops because of a flat tire or the like, the airbag 1 undergoes an enlarged-diameter deformation, and eventually reaches the inner surface of the tire 2, thus the function of supporting the load is offloaded from the tire 2 and placed on the airbag 1. The airbag 1 is provided with a tube 6 having impermeability to air and the hoop-reinforcing layer 7 which is continuously extended circumferentially in the periphery of at least a crown part of the tube 6. Then the hoop-reinforcing layer 7 is constructed of a jointless member integrally molded in the form of a ring. PCOPYRIGHT: (C)2006,JPO&NCIPI