DE19602695C2 - Gas generator with cooling device - Google Patents

Gas generator with cooling device

Info

Publication number
DE19602695C2
DE19602695C2 DE1996102695 DE19602695A DE19602695C2 DE 19602695 C2 DE19602695 C2 DE 19602695C2 DE 1996102695 DE1996102695 DE 1996102695 DE 19602695 A DE19602695 A DE 19602695A DE 19602695 C2 DE19602695 C2 DE 19602695C2
Authority
DE
Germany
Prior art keywords
gas generator
combustion chamber
characterized
gas
generator according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
DE1996102695
Other languages
German (de)
Other versions
DE19602695A1 (en
Inventor
Anh-Dung Tieu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TRW Airbag Systems GmbH
Original Assignee
TRW Airbag Systems GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by TRW Airbag Systems GmbH filed Critical TRW Airbag Systems GmbH
Priority to DE1996102695 priority Critical patent/DE19602695C2/en
Publication of DE19602695A1 publication Critical patent/DE19602695A1/en
Application granted granted Critical
Publication of DE19602695C2 publication Critical patent/DE19602695C2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
    • B60R21/264Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic
    • B60R21/2644Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic using only solid reacting substances, e.g. pellets, powder
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
    • B60R2021/26017Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow a cooling agent being added to the inflation fluid

Description

The invention relates to a gas generator, the compressed gas for inflating egg Airbag generated in an airbag system, with a combustion chamber that inside the gas generator by an upper housing part and a housing terteil is formed with an ignition device for igniting one in the Combustion chamber located propellant, which is from the combustion chamber Compressed gas escaping through outlet openings via flow guidance spaces and outflow openings from the gas generator into the airbag is directed.

Such a gas generator housing is from DE-OS 22 36 380 or known from DE 41 35 299 A1.

Airbag systems are installed in vehicles in the event of an impact accident of the vehicle to reduce the kinetic energy of the vehicle occupants grace and the vehicle occupants before impacting hard vehicles parts, such as the steering wheel or side panels of the vehicle door to protect. If an airbag system sensor system has an impact recognizes the vehicle, is usually in Ta within the gas generator fuel in the form of a sheet ignites in the combustion chamber the housing burns off under high pressure, generating a propellant gas. This propellant gas is used to fill an airbag on which the vehicle insas are placed in the event of a vehicle crash.

The gas generator known from DE 41 35 299 A1 is a so-called Round gas generator, in which the axial height is smaller than the radial The diameter of the gas generator is. The known gas generator has one two-part housing, the two housing parts screwed together  are. There is one in the axially symmetrical housing Combustion chamber provided in which there is a solid propellant in tablets form located. In the event of a vehicle accident, an electrical Current pulse activates an ignition unit near the combustion chamber, which the Fuel ignites. The fuel burns off under high pressure, and so Generated propellant gas escapes through radial outlet openings in one Combustion chamber housing to the outside, flows through flow plates predetermined flow spaces, is cleaned in a filter unit and flows out of the gasge via outlet openings of a cladding sheet nerator in the airbag.

The flow plates on the one hand form a cyclone, which is a Forced operation for the propellant gas in the desired manner, so that not just a multiple flow deflection to cool the hot Propellant gas, but also a separation of small particles. Ande on the other hand, the flow plates also serve to move away from each other stands for a sufficiently relaxed gas flow in and through the fil Hold device. These flow plates must before Ver screw the upper housing part with the lower housing part already in ent speaking recordings be introduced in both housing parts and wäh rend the screwing of both housing parts fixed in position and in front of egg be protected against canting. The gas generator is installed therefore expensive by hand, or there are correspondingly complicated before to provide directions for the assembly of the gas generator. Since the Flow spaces in the known gas generator by at least four Flow plates are formed, is also the number of gas genes parts required accordingly high. The training of special shapes of the flow plates require an elaborate manufacture development.

From DE 43 17 727 A1 a gas generator is known, which is essentially a Chen pot-shaped, two-part housing. In the as a combustion chamber trained interior of the housing is an ignition device for ignition provided for a pyrotechnic charge, the combustion gases emerge from the combustion chamber through outlet openings and flow tion spaces for cooling the propellant gas to a filter device  before they flow into the airbag from the gas generator. This Known gas generator includes a large number of individual parts and in particular the flow spaces and the filter device outside of the actual Combustion chamber housing formed, which requires additional fasteners changed.

A gas generator is also known from US Pat. No. 4,561,675, which is a complicated one has a constructed housing made of aluminum, the housing parts of which dig are connected. It is also known that from aluminum around manufactured objects are not resistant to high temperatures. To the one above To meet the requirements mentioned, housing walls of the known Gas generator formed with a certain thickness, so that the housing has a relatively high weight. Another disadvantage is that the be Known housing to fulfill the various tasks of the Gasgenera tors is divided into a number of chambers that are already in use at Ferti the housing must be trained. Hence the manufacture of the known gas generator complex and expensive. This well-known Gasge nerator consists of several housing parts, their connection points must be carefully manufactured. The connection points include but always a possible source of danger for fragmentation of the Ge housing parts. The error is caused by the complex construction of the housing parts potential in the manufacture of the housing is further increased.

From the generic DE-OS 22 36 380 is a gas generator is known in which coolant is filled into a cooling chamber. The Filling the coolant and sealing the cold room is however complex and cost-intensive.

From DE 24 54 473 B2 a gas generator is known in which a ring-shaped body placed in a room with a powder, in particular powdered iron sulfate is filled. When emanating the Hot gas breaks up the body, and the iron sulfate is said to have the pH value neutralize the escaping gas.  

DE 41 35 299 A1 shows a gas generator with a combustion chamber annular surrounding chamber, in which several baffles below are brought, but which are expensive to manufacture and assemble are. These flow baffles are intended to deflect and cool the hot gas len.

The present invention is therefore based on the object of a gas generator of the type mentioned with a cooling device the one that is easy to manufacture and easy to assemble, and a better one Handling allowed.

The object is achieved according to the invention by the features of claims 1 and 4, respectively solved.

The gas generator according to the invention thus has the essential advantage that a heat sink is present, which is not a shape-related design has and thus easily in the existing flow spaces lets sit. The manufacturing of the body, especially the filling, is very simple, in contrast to filling a chamber in the gas generator. Also recycling of already used gas generators is possible because the sepa rate simply remove the heat sink from the open gas generator men can be. The mixture of silicone foam with its many Pores in which the coolant can be stored and from a Solution, for example water with a coolant for temperatures of -60 ° C to 150 ° C further increases the cooling ability of the heat sink.

In a particularly preferred embodiment, the heat sink is as Cooling bag trained.

The cooling bag preferably consists of a liquid impermeable gene, not heat-resistant material, preferably made of aluminum or Plastic. For example, the cool bag can be made from a durable Plastic film, as used in the food industry, or consist of an aluminum foil, each ver airtight under vacuum is welded. The hot propellant gas emerging from the combustion chamber burns the shell made of the non-heat-resistant material and hits the silicone foam, causing the coolant to evaporate and the hot propellant gas cools down further.  

The above-mentioned object according to the invention is achieved after a second ace pect the invention also solved in that in a flow space Coil spring is arranged as a heat sink, which on the inner walls of the Strö room. The hot drift emerging from the combustion chamber gas hits the moving windings of the coil spring and is there distracted by, caught and cooled, causing damage to the gas genera can be prevented.

The first and the second aspect of the invention can each stand alone or also realized together in a gas generator according to the invention his.

The helical spring is preferably made of a heat-resistant steel.

In a particularly preferred embodiment, the flow space as an annular flow around the combustion chamber space trained. This leads to an even distribution of the too cool lent propellant in the entire flow space, so that the propellant with i. w. same temperature from all outlets of the gas generator flows.

It is particularly advantageous if the heat sink is also in one piece and is annular. This simplifies assembly and the number of Components further. It also ensures that when the cooling body opens at one point, for example the coolant inside of the entire flow space evenly distributed.

In a preferred embodiment, the heat sink is with a Clamping ring applied, which protects the rigidity of the heat sink or  supports and fixes the heat sink in its position in the flow space. The heat sink can then be made of aluminum foil, for example a soft, impervious material.

In a further embodiment of the invention are between the cooling body and the outflow opening one or more sieve and filter device arranged. These sieve and filter devices prevent arising in the combustion chamber during the combustion of the fuel Particles from the gas generator get into the airbag.

Further advantages of the invention result from the description and the Drawing. Likewise, the above and the others According to the invention, the features listed are each individually or individually several can be used in any combination. The shown and described embodiments are not intended to be a final list to understand, but rather have exemplary character for Description of the invention.

The invention is shown in exemplary embodiments in the drawing and is explained in more detail in the following description. The figure shows highly schematic embodiments of a counter according to the invention befitting and is not necessarily to be understood to scale.

It shows

Fig. 1 shows a longitudinal cross section through a gas generator according to the invention, the two halves of the gas generator each representing an aspect of the invention.

In Fig. 1, a gas generator 10 is shown, the housing 11 we essentially consists of a housing upper part 12 and a lower housing part 13 be. These two housing parts 12 , 13 are screwed together and form a combustion chamber 14 in their interior, in which a solid fuel 15 is in tablet form. An ignition unit 16, which is accommodated in the middle of the upper housing part 12 , is connected to the combustion chamber 14 via ignition openings 17 . Within the combustion chamber 14 there is also a filling element 18 which fills the free space in the combustion chamber 14 so that the fuel tablets 15 can not rattle or rattle. The combustion chamber 14 is connected via outlet openings 19 to an annular flow space 20 . A filter and heat insulation insert 21 is arranged in front of the outlet openings 19 . The annular flow space 20 is connected via outlet openings 22 in the housing 11 of the gas generator 10 with an air bag (not shown). From these flow openings 22 , a filter screen 23 is arranged.

The right half of the gas generator 10 shown in FIG. 1 shows a first aspect of the invention. In this, an annular cooling bag 30 is also arranged in the annular flow space 20 , which is liquid impermeable to liquids and contains a mixture of silicone foam rubber 31 and a liquid solution. The silicone foam rubber 31 has many Po ren in which the liquid can be stored. The mixture of the silicone foam rubber 31 and the solution, for example water with a coolant for temperatures from -60 ° C. to 150 ° C., is airtightly welded in the cooling bag 30 in the vacuum process. As a material for the cooling bag 30 z. B. a durable plastic film, such as that used in the food industry, or an aluminum film. The heat sink 30 is positioned within the annular flow space 20 by means of a clamping ring 32 or strikes with low pressure, a lower sieve 33 and a holding piece 34 being arranged between the cooling bag 30 and the clamping ring 32 .

If a sensor system, not shown in the figure, of the airbag system detects a vehicle accident with a hard impact of the vehicle, the ignition unit 16 is activated so that the propellant 15 can ignite and burn within the combustion chamber 14 . The combustion of the propellant by means of 15 creates a propellant gas which is filtered by the filter and heat insulation insert 21 and enters the flow space 20 through the outlet openings 19 .

The hot propellant gas escaping from the combustion chamber 14 is cooled on the one hand by the filter insert 21 and on the other hand on the walls of the flow chamber 20 . Due to this cooling process and the reduced flow velocity within the flow space 20 , hot particles within the fuel gas change from a gaseous to a most solid state and condense on the inner walls of the flow space 20 .

When the hot propellant gas enters through the outlet openings 19 in the annular flow space 20 , it hits the non-heat-resistant cooling bag 30 so that it opens or bursts or burns. The hot propellant hits the silicone foam rubber 31 and the coolant contained therein. This coolant is evaporated by the hot propellant gas, which reduces its temperature. The cooled propellant gas passes through the lower sieve 33 and through the filter sieve 23 to the outflow openings 22 from the gas generator 10 .

In the left half of FIG. 1, a second aspect of the invention is shown, in which a helical spring 40 is arranged within the annular flow space 20 . The helical spring 40 bears against the inner walls of the annular flow space 20 , and its position within the flow space 20 is fixed by means of a clamping ring 42 . Between the coil spring 40 and the clamping ring 42 , a lower sieve 43 and a holding piece 44 are provided.

When the austre through the outlet openings 19 from the combustion chamber 14 propellant gas enters the annular flow space 20 , it hits the movable windings of the coil spring 40 , so that it deflects and is absorbed thereby. In this way, the propellant cools at least to the extent that no damage to the housing 11 of the gas generator 10 is ent and an uncontrolled escape of the propellant z. B. is excluded through fire holes from the gas generator 10 .

Claims (9)

1. Gas generator ( 10 ), which generates compressed gas for inflating an airbag in an airbag system, with a combustion chamber ( 14 ) which is formed inside the gas generator ( 10 ) by an upper housing part ( 12 ) and a lower housing part ( 13 ) with one Ignition device ( 16 ) for igniting a propellant ( 15 ) located in the combustion chamber ( 14 ), the compressed gas emerging from the combustion chamber ( 14 ) via outlet openings ( 19 ) via flow guide spaces and outlet openings ( 22 ) from the gas generator ( 10 ) into the Air bag is passed, characterized in that a fluid-tight cooling body ( 30 ) is arranged in a flow space ( 20 ), which is filled with a cooling liquid and with silicone foam rubber ( 31 ).
2. Gas generator according to claim 1, characterized in that the cooling body ( 30 ) is designed as a cooling bag.
3. Gas generator according to claim 2, characterized in that the cooling bag ( 30 ) consists of a liquid-impermeable, not heat-resistant material, preferably made of aluminum or plastic.
4. Gas generator ( 10 ), which generates compressed gas for inflating an airbag in an airbag system, with a combustion chamber ( 14 ) which is formed inside the gas generator ( 10 ) by an upper housing part ( 12 ) and a lower housing part ( 13 ), with a Ignition device ( 16 ) for igniting a propellant ( 15 ) located in the combustion chamber ( 14 ), the compressed gas emerging from the combustion chamber ( 14 ) via outlet openings ( 19 ) via flow guide spaces and outlet openings ( 22 ) from the gas generator ( 10 ) into the Air bag is passed, characterized in that a helical spring ( 40 ) is arranged as a heat sink in a flow space ( 20 ), which rests against the inner walls of the flow space ( 20 ).
5. Gas generator according to claim 4, characterized in that the helical spring ( 40 ) consists of a heat-resistant steel.
6. Gas generator according to one of the preceding claims, characterized in that the flow space ( 20 ) is designed as a ring-shaped around the combustion chamber ( 14 ) around the flow space ( 20 ).
7. Gas generator according to claim 6, characterized in that the cooling body ( 30 , 40 ) is integrally and annularly formed.
8. Gas generator according to one of the preceding claims, characterized in that the cooling body ( 30 , 40 ) with a clamping ring ( 32 , 42 ) is acted upon.
9. Gas generator according to one of the preceding claims, characterized in that one or more sieve and filter devices ( 23 ; 33 , 43 ) are arranged between the heat sink ( 30 , 40 ) and the outflow opening ( 22 ).
DE1996102695 1996-01-26 1996-01-26 Gas generator with cooling device Expired - Fee Related DE19602695C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1996102695 DE19602695C2 (en) 1996-01-26 1996-01-26 Gas generator with cooling device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1996102695 DE19602695C2 (en) 1996-01-26 1996-01-26 Gas generator with cooling device

Publications (2)

Publication Number Publication Date
DE19602695A1 DE19602695A1 (en) 1997-07-31
DE19602695C2 true DE19602695C2 (en) 2003-07-31

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Family Applications (1)

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DE1996102695 Expired - Fee Related DE19602695C2 (en) 1996-01-26 1996-01-26 Gas generator with cooling device

Country Status (1)

Country Link
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006010953A1 (en) * 2006-03-03 2007-09-06 Takata-Petri Ag Airbag module for a motor vehicle
US7686329B2 (en) 2005-10-17 2010-03-30 Takata-Petri Ag Airbag module for a motor vehicle
CN102149577A (en) * 2008-10-17 2011-08-10 高田-彼得里公开股份有限公司 Gas generator assembly for a motor vehicle

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19726296A1 (en) * 1997-06-20 1998-12-24 Temic Bayern Chem Airbag Gmbh Gas generator with cooling device
DE19726276A1 (en) * 1997-06-20 1998-12-24 Temic Bayern Chem Airbag Gmbh Gas generator with device for producing fluid film
DE19849027A1 (en) 1998-10-23 2000-04-27 Bayerische Motoren Werke Ag Method of igniting an airbag
US20050115721A1 (en) 2003-12-02 2005-06-02 Blau Reed J. Man-rated fire suppression system
DE102007031899A1 (en) * 2007-07-09 2009-01-15 GM Global Technology Operations, Inc., Detroit Multi-level pyrotechnic gas generator for airbag module of motor vehicle to fill air bag with gas, has locking device opening passage between expansion unit and gas, and unit in contact with gas after opening passage by device
DE102007037604A1 (en) 2007-08-07 2009-02-12 Takata-Petri Ag Airbag module for a motor vehicle
US7770924B2 (en) 2008-07-17 2010-08-10 Autoliv Asp, Inc. Liquid cooled hybrid
US8162350B1 (en) 2010-10-07 2012-04-24 Autoliv Asp, Inc. Gas generator
US8939225B2 (en) 2010-10-07 2015-01-27 Alliant Techsystems Inc. Inflator-based fire suppression
JP5739777B2 (en) * 2011-09-21 2015-06-24 タカタ株式会社 Coolant discharging device for airbag and airbag device
US8967284B2 (en) 2011-10-06 2015-03-03 Alliant Techsystems Inc. Liquid-augmented, generated-gas fire suppression systems and related methods

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DE2236380A1 (en) * 1972-07-25 1974-03-21 Thiokol Chemical Corp Gas generator including solid fuel - for high speed inflation of protective cushions in vehicles on collisions
DE2518460A1 (en) * 1974-04-29 1975-10-30 Poudres & Explosifs Ste Nale Pyrotechnical gas generator with movable combustion chamber
DE2541724A1 (en) * 1974-09-18 1976-04-22 Nissan Motor A process for the generation of gases from chemicals
DE2454473B2 (en) * 1973-11-19 1977-03-24 An apparatus for gas generation
US4066415A (en) * 1975-02-03 1978-01-03 Nippon Oil And Fats Co., Ltd. Gas generator for inflatable life raft
FR2427131A1 (en) * 1978-05-29 1979-12-28 Nissan Motor gas generator using silicon carbide grains as refrigerant
US4249673A (en) * 1978-03-02 1981-02-10 Nissan Motor Company, Limited Combusting device for generation of a combustion gas
FR2551674A1 (en) * 1983-09-13 1985-03-15 Mannesmann Ag Reactor for the production of reaction gas
US4561675A (en) * 1984-04-02 1985-12-31 Morton Thiokol, Inc. Auto ignition device
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DE4135299A1 (en) * 1991-10-25 1993-04-29 Bayern Chemie Gmbh Flugchemie Gas generator
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DE1442844A1 (en) * 1961-11-03 1968-12-12 Specialties Dev Corp A method for inflating an inflatable device, and apparatus for carrying out the method
DE2236380A1 (en) * 1972-07-25 1974-03-21 Thiokol Chemical Corp Gas generator including solid fuel - for high speed inflation of protective cushions in vehicles on collisions
DE2454473B2 (en) * 1973-11-19 1977-03-24 An apparatus for gas generation
DE2518460A1 (en) * 1974-04-29 1975-10-30 Poudres & Explosifs Ste Nale Pyrotechnical gas generator with movable combustion chamber
DE2541724A1 (en) * 1974-09-18 1976-04-22 Nissan Motor A process for the generation of gases from chemicals
US4066415A (en) * 1975-02-03 1978-01-03 Nippon Oil And Fats Co., Ltd. Gas generator for inflatable life raft
US4249673A (en) * 1978-03-02 1981-02-10 Nissan Motor Company, Limited Combusting device for generation of a combustion gas
FR2427131A1 (en) * 1978-05-29 1979-12-28 Nissan Motor gas generator using silicon carbide grains as refrigerant
FR2551674A1 (en) * 1983-09-13 1985-03-15 Mannesmann Ag Reactor for the production of reaction gas
US4561675A (en) * 1984-04-02 1985-12-31 Morton Thiokol, Inc. Auto ignition device
US5189255A (en) * 1989-09-04 1993-02-23 Mitsuhiko Fukabori Gas generator
US5306041A (en) * 1991-06-21 1994-04-26 Daicel Chemical Industries, Ltd. Gas generator having housing of double structure
DE4135299A1 (en) * 1991-10-25 1993-04-29 Bayern Chemie Gmbh Flugchemie Gas generator
DE4317727A1 (en) * 1992-06-02 1993-12-09 Livbag Snc Gas producer for use with vehicle type inflatable safety cushion - having pyrotechnic charge and safety opening to avoid unwanted and dangerous explosions of charge

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7686329B2 (en) 2005-10-17 2010-03-30 Takata-Petri Ag Airbag module for a motor vehicle
WO2007101644A1 (en) 2006-03-03 2007-09-13 Takata-Petri Ag Airbag module for a motor vehicle
EP2019004A1 (en) 2006-03-03 2009-01-28 Takata-Petri AG Airbag module for a motor vehicle
EP2019003A1 (en) 2006-03-03 2009-01-28 Takata-Petri AG Airbag module for a motor vehicle
EP2036785A1 (en) 2006-03-03 2009-03-18 Takata-Petri AG Airbag module for a motor vehicle
EP2048042A1 (en) 2006-03-03 2009-04-15 Takata-Petri AG Airbag module for a motor vehicle
DE102006010953A1 (en) * 2006-03-03 2007-09-06 Takata-Petri Ag Airbag module for a motor vehicle
CN102149577A (en) * 2008-10-17 2011-08-10 高田-彼得里公开股份有限公司 Gas generator assembly for a motor vehicle

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