WO2003082634A2 - Multiple chamber dual stage inflator - Google Patents
Multiple chamber dual stage inflator Download PDFInfo
- Publication number
- WO2003082634A2 WO2003082634A2 PCT/US2003/009423 US0309423W WO03082634A2 WO 2003082634 A2 WO2003082634 A2 WO 2003082634A2 US 0309423 W US0309423 W US 0309423W WO 03082634 A2 WO03082634 A2 WO 03082634A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- chamber
- gas
- combustion
- housing
- primary
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/26—Inflatable 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
- B60R21/264—Inflatable 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
- B60R21/2644—Inflatable 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/26—Inflatable 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
- B60R21/263—Inflatable 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 a variable source, e.g. plural stage or controlled output
- B60R2021/2633—Inflatable 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 a variable source, e.g. plural stage or controlled output with a plurality of inflation levels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/26—Inflatable 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
- B60R21/264—Inflatable 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
- B60R21/2644—Inflatable 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
- B60R2021/2648—Inflatable 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 comprising a plurality of combustion chambers or sub-chambers
Definitions
- the present invention relates to gas generators, used to inflate air bags in a vehicle occupant protection system for example, and more particularly, to an improved dual chamber gas generator containing an improved structure for isolating the propellant chambers of a dual chamber inflator so as to ensure proper deployment of the airbag while yet simplifying the manufacture thereof
- Inflation systems for deploying an air bag in a motor vehicle generally employ a single gas generator in fluid communication with an uninflated air bag.
- a firing circuit typically triggers the gas generator when the sensed vehicle acceleration exceeds a predetermined threshold value, as through the use of an acceleration-responsive inertial switch.
- air bag inflation systems utilizing a single gas generator suffer from the disadvantage that the onset pressurization/inflation rate is generally set to provide aggressive initial inflation in order to achieve a particular inflation time related to occupant position.
- An aggressive onset rate of pressurization becomes problematic in situations where the occupant is out of position. More specifically, rapid onset pressurization of the air bag may cause the air bag to impact against the occupant with a greater force than necessary.
- the airbag volume and inflating capacity are designed to protect both large and small occupants and are generally not variable within the single gas generator.
- smaller occupants usually children and smaller adults are protected, but sometimes with more force than is necessary. Accordingly, there is a continuous drive to reduce the force acting upon a respective occupant to a tailored force rather than utilizing a generalized force that protects all sizes of occupants.
- U.S. Patent No. 5,400,487 discloses an inflation system that overcomes the above problem by utilizing a plurality of gas generators which are controllably ignited to provide a variable inflation profile which can be tailored to any given occupant weight and/or position and for any crash type. While this arrangement dramatically improves the inflation system's ability to protect an occupant, it does so at significant expense and complexity.
- the multiple gas generators and squibs add considerable cost to the system, while the firing control circuitry requires sophisticated processors capable of accurately timing the various ignition profiles.
- a multiple chamber inflator comprising a perforate housing.
- a first wall within the housing forms a first perforate combustion chamber.
- a first gas generating composition or propellant is contained within the first chamber that when ignited produces a first inflating gas.
- a first igniter fixed within the first chamber selectively ignites the first propellant upon receipt of a signal from a crash sensor or system algorithm for example.
- a second perforate combustion chamber is formed by a second wall within the housing and contains a second gas generant composition within the second chamber that when ignited produces a second inflating gas.
- a second igniter fixed within the second chamber selectively ignites the second propellant upon receipt of a signal from a crash sensor or system algorithm, for example.
- the perforated first and second walls are initially sealed prior to inflator operation. Upon selective operation of either chamber, independent operation of the other chamber is assured by the insulating seals provided about each of the first and second chambers. As such, either the first or second chamber may be operated without the resultant operation of the other chamber, if desired.
- a primary combustion chamber is formed within the perforated housing and about the first and second chambers.
- the primary chamber is initially 95 sealed to facilitate a pressure increase within the chamber until the pressure ruptures the associated seal.
- the primary chamber contains a primary gas generant composition that when combusted produces a primary inflating gas.
- Activation of either the first and/or second chamber results in fluid communication with the first and/or second inflating gas(es) and the p ⁇ mary 100 propellant within the primary chamber. Accordingly, the primary propellant is therefore ignited by fluid communication with either or both of the first and second inflating gases and any attendant flame front created by combustion of the first and/or second gas generant compositions.
- the first and second chambers are identical in accordance with the present invention.
- the first and second gas generant compositions are preferably of equal composition and in equal amounts, or, may be of different compositions and/or of different amounts.
- the need for part differentiation during the assembly process is
- the first and second chambers are preferably disposed symmetrically within the primary chamber. Use of equal-sized first and second chambers requires less tooling, thereby reducing
- a multiple chamber inflator 10 contains a perforate housing 12.
- the housing is initially sealed to facilitate a pressure buildup upon inflator 10 operation.
- a first wall 14 is fixed or disposed within the housing 12 and forms a first chamber 16.
- a first gas generant composition or propellant 18 is housed within the chamber 16 and provides a first inflating gas upon selective
- a first igniter 20 is fixed or disposed within the chamber 16 and in a known manner ignites the propellant 18 upon receipt from a crash sensor algorithm, for example.
- a first at least one gas exit orifice 22 and preferably a plurality of gas exit orifices 22 provides fluid communication between the first inflating gas and any attendant flame front with the interior of
- the orifice(s) 22 is sealed prior to activation of the first chamber 16 thereby insulating the chamber from exterior combustion.
- a second wall 24 is fixed or disposed within the housing 12 and forms a second chamber 26 of a specified dimension and volume substantially equivalent or equal to the
- a second gas generant composition or propellant 28 is housed within the chamber 26 and provides a second inflating gas upon selective combustion thereof.
- a second igniter 30 is fixed or disposed within the chamber 26 and in a known manner ignites the propellant 28 upon receipt from a system algorithm, for example.
- At least one gas exit orifice 32 and preferably a plurality of gas exit orifices 32 provides fluid communication between the second inflating gas and any attendant flame front with the interior of the housing 12.
- the orifice(s) 32 is sealed prior to activation of the second chamber 26 thereby insulating the chamber from exterior combustion. Accordingly, independent operation of
- a primary combustion chamber 34 is defined by an inner housing wall 36 and therefore also formed within the housing 12 and about chambers
- a main propellant 38 is contained within the primary chamber 34 that when combusted produces an effective amount of a third or primary inflating gas.
- Activation of the first chamber 16 and/or the second chamber 26 produces a first and/or second respective inflating gas that upon exiting its respective chamber commingles with the primary propellant 38 within chamber
- a third at least one gas exit orifice 40 and preferably a plurality of gas exit orifices 40 are oriented about the periphery of the housing 12 and initially sealed prior to inflator 10 operation. Upon inflator 10 operation, the pressure buildup with chamber 34 results in rupture of the seals of orifice(s) 40 thereby facilitating the release of gas into an airbag (not shown).
- chambers 16 and 26 are of equal dimension or size.
- Gas generating compositions 18 and 28 may be of equal composition and in equal amounts, or, may be of different compositions and/or of different amounts.
- Gas generating composition 38 may be the same
- chambers 16 and 26 contain the same gas generant composition and in identical amounts thereby eliminating the need for part differentiation during the assembly process. As shown in the figures, chambers 16 and 26 are preferably disposed symmetrically within chamber 34, or, stated another way,
- the inflator 10 further contains a filter 42 radially disposed about the chamber 34 for filtration of the combustion gases.
- the inflator 10 of the present invention is formed by methods known in the art.
- the housing 12, for example, may be formed from a cap and a base by stamping or other known forming processes.
- chambers 1 6 and 26 may be cast or stamped and then welded, or otherwise fixed to the housing 1 2.
- the igniters 20 and 30 and the gas generant compositions 1 8, 28, and 38 are state-of-the art igniters and compositions, respectively, well known for their use in airbag inflators, for example.
- the filter 42 may be provided as expanded wire from Wayne Wire in Saginaw, Michigan.
- inflators having equal- sized inner chambers 1 6 and 26 require less tooling and therefore reduce manufacturing costs and complexity. Additionally, identical construction of chambers 1 6 and 26, i.e. having the same type and amount of gas generant composition and having the same igniter, eliminates the need for maintaining part orientation throughout the manufacturing process. For example, during assembly either igniter connector lead may be connected to either igniter without adverse performance.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03714429A EP1487676A2 (en) | 2002-03-26 | 2003-03-26 | Multiple chamber dual stage inflator |
JP2003580125A JP2005521582A (en) | 2002-03-26 | 2003-03-26 | 2-stage inflator with multiple chambers |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US36769002P | 2002-03-26 | 2002-03-26 | |
US60/367,690 | 2002-03-26 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2003082634A2 true WO2003082634A2 (en) | 2003-10-09 |
WO2003082634A3 WO2003082634A3 (en) | 2004-03-18 |
Family
ID=28675386
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2003/009423 WO2003082634A2 (en) | 2002-03-26 | 2003-03-26 | Multiple chamber dual stage inflator |
Country Status (4)
Country | Link |
---|---|
US (1) | US6860511B2 (en) |
EP (1) | EP1487676A2 (en) |
JP (1) | JP2005521582A (en) |
WO (1) | WO2003082634A2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2006160251A (en) * | 2004-12-08 | 2006-06-22 | Delphi Technologies Inc | Gas generator |
WO2008128669A1 (en) * | 2007-04-19 | 2008-10-30 | Autoliv Development Ab | Airbag system |
Families Citing this family (12)
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DE20219899U1 (en) * | 2002-12-23 | 2003-05-28 | Trw Airbag Sys Gmbh | inflator |
US20050115721A1 (en) | 2003-12-02 | 2005-06-02 | Blau Reed J. | Man-rated fire suppression system |
US7520530B2 (en) * | 2004-12-20 | 2009-04-21 | Daicel Chemical Industries, Ltd. | Gas generator for air bag |
US20070085314A1 (en) * | 2005-10-14 | 2007-04-19 | Daicel Chemical Industries, Ltd. | Gas generator for airbag |
JP5101923B2 (en) * | 2007-04-18 | 2012-12-19 | 株式会社ダイセル | Gas generator for restraining vehicle personnel |
DE102008060305A1 (en) * | 2008-12-03 | 2010-06-10 | Trw Airbag Systems Gmbh | inflator |
EP2380786B1 (en) * | 2009-01-22 | 2014-03-19 | Autoliv ASP, Inc. | Gas generator for airbag device |
US8939225B2 (en) * | 2010-10-07 | 2015-01-27 | Alliant Techsystems Inc. | Inflator-based fire suppression |
DE202010014286U1 (en) * | 2010-10-15 | 2012-01-30 | Trw Airbag Systems Gmbh | Gas generator and gas bag module |
US8967284B2 (en) | 2011-10-06 | 2015-03-03 | Alliant Techsystems Inc. | Liquid-augmented, generated-gas fire suppression systems and related methods |
US10281248B2 (en) * | 2015-11-11 | 2019-05-07 | Northrop Grumman Innovation Systems, Inc. | Gas generators, launch tube assemblies including gas generators, and related systems and methods |
WO2017176977A1 (en) | 2016-04-07 | 2017-10-12 | 3D Systems, Incorporated | Thiol-ene inks for 3d printing |
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2003
- 2003-03-26 JP JP2003580125A patent/JP2005521582A/en active Pending
- 2003-03-26 US US10/401,091 patent/US6860511B2/en not_active Expired - Fee Related
- 2003-03-26 WO PCT/US2003/009423 patent/WO2003082634A2/en active Application Filing
- 2003-03-26 EP EP03714429A patent/EP1487676A2/en not_active Withdrawn
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US6019389A (en) * | 1998-03-31 | 2000-02-01 | Trw Vehicle Safety Systems Inc. | Air bag inflator |
US6189922B1 (en) * | 1998-09-21 | 2001-02-20 | Autoliv Asp Inc. | Inflator with multiple initiators |
US6364354B1 (en) * | 1998-09-28 | 2002-04-02 | Daicel Chemical Industries, Ltd. | Air bag gas generator and air bag apparatus |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006160251A (en) * | 2004-12-08 | 2006-06-22 | Delphi Technologies Inc | Gas generator |
WO2008128669A1 (en) * | 2007-04-19 | 2008-10-30 | Autoliv Development Ab | Airbag system |
Also Published As
Publication number | Publication date |
---|---|
US20030222445A1 (en) | 2003-12-04 |
WO2003082634A3 (en) | 2004-03-18 |
EP1487676A2 (en) | 2004-12-22 |
JP2005521582A (en) | 2005-07-21 |
US6860511B2 (en) | 2005-03-01 |
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