Gas generator, particularly for an inflatable impact cushion for protecting an occupant of a motor vehicle from injury

US5415845A · kind A · utility

Assignee

• Dynamit Nobel GmbH · DE

Inventors

• Uwe Brede · Ergolding, DE
• Josef Kraft · Starnberg, DE
• Wolfram Seebeck · Veitsbronn, DE

Key dates

• Filing date: Apr 12, 1994
• Grant date: May 16, 1995
• Expiry date: Apr 12, 2014

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60R21/264
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

Gas generator for an inflatable impact cushion for protecting an occupant of a motor-vehicle from injury, has a housing, in which is formed a storage chamber for liquid gas. The storage chamber is separated by a partition wall from a combustion chamber also formed in the housing. An ignition device is positioned in a precombustion chamber, and has an ignition charge to generate combustion gases during ignition. In the precombustion chamber there is guided, in a displaceable manner, a piston which, because of the combustion gases of the ignition charge, moves into and through the combustion chamber in a direction of the partition wall, in order to penetrate the partition wall. When the partition wall is penetrated there is a connection between the storage chamber and the combustion chamber by way of a liquid gas channel system so that liquid gas can flow into the combustion chamber. At the same time a connection is created between the precombustion chamber and the (main) combustion chamber by way of ignition channels formed in the piston. The hot combustion gases of the ignition charge ignite the liquid gas flowing in. The rising internal pressure in the combustion chamber causes a …