Toric reinforced air bag for safety tire and method of producing the same as well as method of producing shaped body for reinforcing layer

Abstract

The invention proposes a technique of preventing a propagation of a damage in a reinforcing layer to a toric air bag even if the reinforcing layer arranged on an outer peripheral side of the toric air bag in a safety tire to suppress an unnecessary size growth of the toric air bag and allowed to a proper expansion deformation of the toric air bag in the puncture of the tire or the like is damaged by foreign matters entered through a puncture hole into the tire, in which the reinforcing layer separately arranged from the toric air bag is fitted on the outer peripheral side of the toric air bag having a hollow torus shape over its full periphery to suppress the propagation of the damage in the reinforcing layer to the toric air bag through an interface layer therebetween.

1 . A method of producing a shaped body for a reinforcing layer in a toric reinforced air bag for a safety tire placed inside a tire and inflated under a certain internal pressure, and expansion-deformed accompanied with the drop of the internal tire pressure to subrogate a load support from the tire, which comprises extending a narrow-width strip made of a composite body of fibrous members and rubber on an outer surface of a hard support having a desired cross-sectional outer profile form substantially in a peripheral direction thereof and spirally winding and building thereon in a widthwise direction to form a shaped body for a reinforcing layer.  
   
   
       2 . A method of producing a shaped body for a reinforcing layer in a toric reinforced air bag for a safety tire according to  claim 1 , wherein an inclination angle of the narrow-width strip with respect to the peripheral direction of the hard support is 0-30°.  
   
   
       3 . A method of producing a shaped body for a reinforcing layer in a toric reinforced air bag for a safety tire according to  claim 1 , wherein the narrow-width strip is wound so as to overlap at least widthwise parts of the wound strips with each other.  
   
   
       4 . A method of producing a shaped body for a reinforcing layer in a toric reinforced air bag for a safety tire according to  claim 3 , wherein an overlap amount of the narrow-width strip is changed in accordance with widthwise positions of the hard support.  
   
   
       5 . A method of producing a shaped body for a reinforcing layer in a toric reinforced air bag for a safety tire according to  claim 1 , wherein the narrow-width strip is wound while contacting side faces of the strips with each other.  
   
   
       6 . A method of producing a shaped body for a reinforcing layer in a toric reinforced air bag for a safety tire according to  claim 1 , wherein the fibrous member is cords extending straight or wavy in an extending direction of the narrow-width strip, or non-woven fabric.  
   
   
       7 . A method of producing a shaped body for a reinforcing layer in a toric reinforced air bag for a safety tire according to  claim 1 , wherein the narrow-width strip has a width of 10-70 mm.