Motor-vehicle wheel with a tyre mounted on a rim and a sound-absorbing device , and method of manufacturing such a device

摘要

The sound absorbing insert (5) has an acoustically transparent load bearing reinforcement (6) extending around the tire. The reinforcement may cover the insert surface facing the inside of the tire or may be in radial layers between sound absorbing layers. Sound absorbing material is a foam whose pores are elongated mainly in the circumferential direction of the tire. An Independent claim is made for a process for manufacturing a sound absorbing member. Preferred Features: Reinforcing fibers (6) have high tensile strength and run circumferentially or may be in the form of a fabric. Reinforcement applies a hoop tension into the insert. An alternative reinforcement comprises an isotropic perforated film. The insert is a closed ring and may consist of wound strips of sound insulating material covered on one or both sides with reinforcement. Noise absorbing material is heat shrinkable and is extruded. Foaming either starts or occurs in the die or may occur after emerging from the die.