Importance

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Abstract

An air bag for a vehicle occupant restraint system comprises several sewn fabrics parts. All fabric parts consist of fabric which has the same fiber density and filament yarn. The gas permeability curve of the entire gas bag increases as a function of the internal gage pressure. At a gage pressure of approximately 10 kPa the permeability is at a value between approximately 0.4 and approximately 1.0 m.sup.3 /s. On further increases in gage pressure to values between approximately 10 kPa and approximately 20 kPa, the gas permeability of the air bag reaches a maximum and then decreases when the gage pressure is above approximately 20 kPa to at least approximately 40 kPa. This form of the gas permeability curve means that hardness of the air bag is automatically regulated in order to provide low hardness during the initial pressure build up. A high impact intensity penetration by the occupant into the air bag is prevented by increased hardness due to relatively low permeability of the air bag material at high pressures in the air bag.

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First Claim