Land vehicles – Wheeled – Attachment
Patent
1998-02-27
2000-03-28
Dickson, Paul N.
Land vehicles
Wheeled
Attachment
B60R 2126
Patent
active
060421460
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for filling a restraint device, in particular an impact cushion (airbag) for the protection of the occupants of a motor vehicle, the restraint device being filled by means of an inert gas or gas mixture stored in a pressure container in accordance with the introductory clause of claim 1.
A generic hybrid gas generator is known for example from the patent document DE 44 05 997 C1.
For the hybrid gas generator described therein, having a pyrotechnic gas generator and a high pressure container, in which after the ignition of propellant, hot propellant gases flow out from an opening of a combustion chamber and blow against a sealing disc of the high pressure container arranged opposite the opening and after the sealing disc is opened, the propellant gases and gas from the high presure container flow through outlet openings into a gas bag, the use of a formulation for the propellant is proposed with a surplus of substances for generating a chemically reactive propellant gas, which attacks the sealing disc on its surface not only thermally, but also chemically and continuously burns through it, in order to open the closing sealing disc without the occurrence of a high acoustic pressure.
The hybrid gas generator described therein has the disadvantages that on the one hand only an unsufficient mixing takes place between the cold gas stored in the high pressure container and the pyrotechnically produced hot gas in the mixing chamber, so that owing to the only slightly cooled hot gas a severe thermal stressing takes place of parts of the gas generator and of the impact cushion. This results firstly in an increased risk of injury to vehicle occupants and secondly, greater wall thicknesses of the relevant parts are necessary, and hence additional material and weight. On the other hand, the gas generator has a non-reproducible opening behaviour of the membrane, so that the moment at which cold gas emerges from the high pressure container is afflicted with a high element of uncertainty. The propellant is in a quantity such that only the membrane is welded open and only an insufficient heating of the compressed gas takes place at a low ambient temperature.
It is therefore an object of the invention to indicate a hybrid gas generator of the type initially mentioned, by which the above-mentioned disadvantages are avoided.
This problem is solved by a device for filling a restraint device, in particular an impact cushion (airbag) for the protection of the occupants of a motor vehicle, with the following features: stored in a pressure container; membrane; igniter case has further nozzles directed radially outwards, and finally propellant, onto the membrane.
Further developments and advantageous embodiments of the invention are described in the sub-claims.
The advantages of the invention lie in particular in that due to the novel arrangement of the nozzles in the igniter case and of the nozzle bores, the membrane, by which the high pressure container is closed, is opened at an earlier moment. The cold gas is thereby mixed earlier and consequently better with the pyrotechnically produced hot gas of the ignition unit, and the thermal stress on parts of the gas generator and of the impact cushion is reduced.
An example embodiment of the invention is explained in detail hereinbelow and illustrated with the aid of a FIGURE.
The FIGURE shows a hybrid gas generator 1, consisting of a pyrotechnic module 100 and of a compressed gas container 300 with filling device 32 and compressed gas container wall 33. The filter housing 2 and the compressed gas container 300 are held together by means of a connection 16 in the nature of an interlocking fit.
The pyrotechnic module 100 is arranged as a slide-in unit in a filter housing 2 with exhaust openings 15 and a flange 4 for fastening an impact cushion and consists substantially of an ignition unit 110 and a combustion chamber unit 120. The compressed gas container 300 has an outlet nozzle 310 which is closed by means of the membrane 311. The opening behaviour
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Bauer Hermann
Bender Richard
Dolling Uwe
Kistler Thomas
Zeuner Siegfried
Dickson Paul N.
TRW Airbag Systems GmbH & Co. KG
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