Vehicle wheel tube for emergency running - has reinforcement of woven cord layers contracting laterally as dia. increases

摘要

A tube, for emergency running on wheels with air-filled tyres, has in the zone of its outer circumference, a plastic layer for plugging a puncture. There is a reinforcement belt bonded to the circumference of the tube, the width of which diminishes when the dia. of the tube increases. A load is thus applied to the tube which deforms it in the direction of the reduced width. This gives an efficient sealing action when the emergency tube itself is damaged and considerable expansion takes place. The contraction of the belt reinforcement can cause a thickening of the emergency tube in the zones of its crest.