Liquid propellant airbag inflator

B - Operations – Transporting – 60 – R

Patent

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Details

B60R 21/26 (2006.01) B60R 21/28 (2000.01)

Patent

CA 2279404

An airbag inflator (20) includes a pair of telescoping pistons (28, 52) slidingly mounted within a housing (22). Pressurization of a combustion chamber (50) by a pyrotechnic initiator (38) acts on one piston to pressurize a hydraulic fluid chamber (58), which, in turn, acts on the other piston to pressurize a liquid propellant reservoir (54). Liquid propellant can then be regeneratively pumped from the reservoir into the combustion chamber for combustion to generate an airbag inflation gas. A hydraulic fluid damping chamber (62) is utilized to exert a controllable retarding force on the one piston, such as to control the rate of airbag inflation gas generation.

Un dispositif de gonflage (20) d'airbag comprend une paire de pistons télescopiques (28, 52) montés coulissants dans un boîtier (22). La mise sous pression d'une chambre de combustion (50) par un initiateur pyrotechnique (38) agit sur un piston pour mettre sous pression une chambre de fluide hydraulique (58) qui, à son tour, agit sur l'autre piston pour mettre sous pression un réservoir de propulseur liquide (54). Le propulseur liquide peut être pompérégénérativement dans le réservoir et envoyé dans la chambre de combustion pour produire par combustion un gaz utile pour gonfler l'airbag. Une chambre d'amortissement à fluide hydraulique (62) permet d'exercer une force de retardement régulable sur un piston de manière à réguler la vitesse de production du gaz servant à gonfler l'airbag.

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