Valve for a cold gas generator and airbag system

US9573557B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Dirk Wolf · Dortmund, DE
• Rudolf Heinz · Renningen, DE
• Andreas Illmann · Weil der Stadt, DE
• Horst Jung · Dietzenbach, DE
• Nikola Jovicic · Kitchener, CA
• Stefan Woerz · Lambach, DE
• Guenther Hohl · Stuttgart, DE
• Uwe Iben · Eslarn, DE
• Raed Hamada · Stuttgart, DE
• Elmar Vier · Freiberg, DE
• Werner Nitschke · Ditzingen, DE
• Dietmar Kratzer · Tamm, DE
• Peter Wassermann · Weil der Stadt, DE

Key dates

• Filing date: Feb 27, 2014
• Grant date: Feb 21, 2017
• Expiry date: Feb 27, 2034

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60R2021/26094
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A valve for a cold gas generator for an airbag in a vehicle includes: a valve chamber; a control chamber; a control piston; an overflow channel; a retaining element; and a shutoff element. The valve chamber includes an inlet from the cold gas generator and an outlet to the airbag. The control piston separates the control chamber and the valve chamber. The control piston is movable between an open position and a closed position, the control piston releasing the outlet in the open position and closing it in the closed position. The control piston has (i) a first active piston surface on the side of the valve chamber, and (ii) a second active piston surface on the side of the control chamber. The first piston surface is smaller than the second piston surface. The overflow channel fluidically connects the valve chamber and the control chamber to one another.