Land vehicles – Wheeled – Attachment
Patent
1998-01-21
1999-08-03
English, Peter C.
Land vehicles
Wheeled
Attachment
102531, B60R 2126
Patent
active
059314966
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a gas generator, particularly for an airbag, having a cylindrical outer tube, the open front ends of which are sealed by cover elements, an inner tube of smaller diameter which is arranged coaxially inside the outer tube and has discharge apertures, an ignitable gas producing material inside the inner tube, filter elements in the annular chamber between the inner and outer tubes, and an ignition unit to ignite the gas producing material.
A gas generator of this kind is known from DE 43 24 554 A1 for example. This known gas generator has a cylindrical outer tube which represents the housing of the gas generator and the open front ends of which are sealed by cover elements. A cylindrical inner tube of smaller diameter is coaxially arranged in the outer tube; this internal tube defines the limits of the combustion chamber, in which a gas-producing material which can be ignited by means of an ignition unit is accommodated, and is provided with several discharge apertures in the tube wall. In the annular chamber between the inner and the outer tubes is a filter element which generally comprises a multiplicity of layers of wire mesh, steel wool and/or metal fibre fleece. The combustion gas which emerges from the discharge apertures of the inner tube flows through the filter elements which absorb solid and liquid and/or condensed combustion products and escapes, cleaned, via gas outlet apertures in the outer tube.
In order to obtain constant aperture gas pressures at all temperatures, a rolled, self-overlapping insulating strip which at least partially lies against the wall is arranged in the inside of the inner tube in order to insulate the discharge apertures.
On the outside of the inner tube the discharge apertures are covered with a sealing strip to seal against moisture.
A gas generator in which the gas-generating material is arranged in a charge container made of a metal foil is known from U.S. Pat. No. 4,131,299. This has the advantage that an additional insulating strip and sealing strip can be dispensed with. Furthermore, the assembly of the gas generator is substantially simplified as the charge container can be filled away from the actual production line and further processed in the sealed condition. This substantially increases safety.
A gas generator arrangement with a flame guide tube is known from DE 43 93 229 T1. This tube extends in the axial direction of the housing and a multiplicity of apertures are formed in the side wall of the flame guide tube. The outside of the flame guide tube thus defines the flame guiding. Furthermore, intensifier charges are accommodated in the flame guide tube. The shock wave or flame from the ignition charge and/or intensifier charge moves through the flame guide tube and finds its way through the apertures into the gas-generating charge and ignites it. The number and position of the apertures is selected in such a way that the gas-generating charge is "over-ignited". This means that the gas-generating charge is ignited at a multiplicity of different places in order to ensure that the pressure of the generated gas exhibits no undesirable pressure peaks, so as to ensure controlled burning.
SUMMARY OF THE INVENTION
The object underlying the invention is to improve a gas generator of the type described above in such a way that the gas-generating charge is safe and easy to handle on assembly on the one hand and that the combustion chamber pressure and hence the generator performance is adjustable on the other hand.
This object is achieved according to the invention in that the gas-producing material is arranged in a hermetically sealed charge container and that a flame guide tube which is formed in one piece with the charge container and has only one flame outlet aperture is arranged in the charge container.
The use of a hermetically sealed charge container has the advantage that no insulating strip and no sealing strip needs to be used. Furthermore, assembly is substantially simplified. The use of a flame guide t
REFERENCES:
patent: 3715131 (1973-02-01), Hurley et al.
patent: 3972545 (1976-08-01), Kirchoff et al.
patent: 4370930 (1983-02-01), Strasser et al.
patent: 4468016 (1984-08-01), Kobari et al.
patent: 5443286 (1995-08-01), Cunningham et al.
patent: 5447105 (1995-09-01), Bauer et al.
patent: 5471932 (1995-12-01), Kraft et al.
Brede Uwe
Kraft Josef
Scheiderer Gerrit
Schmid Michael
Dynamit Nobel GmbH Expolsivstoff-und Sytemtechnik
English Peter C.
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