WO2002000477A1 - Kaltgasgenerator für ein airbag-system - Google Patents
Kaltgasgenerator für ein airbag-system Download PDFInfo
- Publication number
- WO2002000477A1 WO2002000477A1 PCT/EP2001/006991 EP0106991W WO0200477A1 WO 2002000477 A1 WO2002000477 A1 WO 2002000477A1 EP 0106991 W EP0106991 W EP 0106991W WO 0200477 A1 WO0200477 A1 WO 0200477A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- gas generator
- generator according
- cold gas
- piston
- gas outlet
- Prior art date
Links
- 239000007789 gas Substances 0.000 claims description 76
- 238000007789 sealing Methods 0.000 claims description 10
- 230000002093 peripheral effect Effects 0.000 claims description 7
- 239000001307 helium Substances 0.000 claims description 5
- 229910052734 helium Inorganic materials 0.000 claims description 5
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 5
- 238000003860 storage Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
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
- B60R21/268—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 release of stored pressurised gas
-
- 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
- B60R21/23—Inflatable members
- B60R21/231—Inflatable members characterised by their shape, construction or spatial configuration
- B60R2021/23107—Inflatable members characterised by their shape, construction or spatial configuration the bag being integrated in a multi-bag system
-
- 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
- B60R21/268—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 release of stored pressurised gas
- B60R2021/2685—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 release of stored pressurised gas comprising a plurality of pressure chambers
Definitions
- the invention relates to a cold gas generator for an airbag system with the features according to the preamble of claim 1.
- Known airbag systems such as those used in motor vehicle construction and how they can also be used in rail or aircraft construction, essentially consist of an airbag which is folded up in the idle state and can be filled with a gas if necessary, a gas generator which provides the filling gas, and from a triggering device which initiates the filling process at an accident-related limit level which is above a defined limit value.
- a so-called cold gas generator has a reservoir filled with a gas under pressure and a gas outlet opening which can be closed in the idle state and opened if necessary by an opening mechanism, thereby filling the airbag.
- the side airbag mentioned can be designed as a system of, for example, three individual airbags, the nature of each individual airbag being matched to the parts of the body to be protected.
- the large number of gas generators required for this is expensive and is therefore a widespread use of modern safety counter technology. It is difficult to fill the individual airbags in a precisely coordinated manner if necessary.
- the invention has for its object to develop a generic cold gas generator such that the use of airbag systems with improved coordination is possible at a reduced cost.
- the store of the cold gas generator has a cylindrical shape, which runs along one Middle part extending in the longitudinal axis, in which a longitudinally displaceable piston is held.
- the piston forms a partition for dividing the interior into two sub-rooms and, in its rest position, keeps a gas outlet opening closed by one of the two sub-rooms. Due to this arrangement, only a simple opening mechanism needs to be provided, which only acts on one gas outlet opening. When this gas outlet opening is opened, the gas pressure in one of the subspaces drops, as a result of which the piston is displaced in the direction of the longitudinal axis of the accumulator and thereby releases the further gas outlet opening.
- a simple and effective opening mechanism is provided by arranging a sealing disk which closes a gas outlet opening on the end face and has a predetermined breaking point, the sealing disk being supported by a support element.
- a pyrotechnic actuator can, if necessary, move the support element laterally or in such a way that the sealing washer is no longer supported.
- the predetermined breaking point is dimensioned such that it is destroyed by the applied gas pressure in the unsupported state of the sealing disk and the sealing disk opens the gas outlet opening.
- This arrangement requires only very little energy, which is stored in the opening mechanism, to actuate and which only has to cause the displacement of the support element. The actual opening of the various gas outlet openings takes place through the energy of the compressed gas stored in the storage.
- the peripheral wall of the accumulator expediently has a tapering cross section in the region of its front end, which has a braking effect on the piston moving at high speed and thus avoids mechanical pulse peaks during the triggering process.
- the piston or pistons each have a connecting channel for the pressure-transmitting connection of two subspaces adjacent to a piston, which ensures that in the idle state the same pressure prevails in all subspaces of the cold gas generator and the piston system is therefore in equilibrium of forces.
- a flow restrictor is arranged in each of the connecting channels, which means that, on the one hand, when the accumulator is filled comparatively slowly during the manufacturing process, pressure equalization can take place in the individual subspaces while avoiding excessive differential pressures.
- the gas stored in the individual subspaces is emptied into the ! 01 ⁇ . ⁇ 02 ⁇ ⁇ . O. NN Hi 0 ) N rt> MN "d Di « a «?? D. 02 Di 0J 1 a Di 3 3 ⁇ _ ⁇ .
- the gas outlet openings can be opened reliably and with little actuation force if necessary, in that the respective piston executes a longitudinal movement as described above and thereby separates the closure body from the base body at the predetermined breaking point.
- the base body is expediently designed as a circular disk on which a pin is integrally formed. The pin engages in a corresponding bore in the piston, while the circular disk is attached to the peripheral wall, in particular by means of a sealing weld seam.
- An outflow bore is provided in the same axis as the circular disk and the pin, the diameter of which is slightly smaller than the diameter of the pin, and the depth of which corresponds at least approximately to the thickness of the circular disk. This creates a short, thin-walled piece of pipe in the area of the connection point between the circular disc and the pin, which forms the predetermined breaking point mentioned above.
- a gas outlet opening precisely defined by the outflow bore remains; the desired shear force at the predetermined breaking point can be adjusted simply and precisely by coordinating the pin diameter and the outflow bore diameter.
- the piston on its side facing away from the outflow position advantageously has a defined overlap length with respect to the outflow bore.
- the overlap length can be dimensioned differently for the individual pistons, whereby a time offset of the start of the inflation process of the individual airbags can be controlled relative to one another.
- Helium has proven to be advantageous as the filling gas, since this gas has a low dependence on pressure and temperature.
- the filling pressure of the accumulator can be selected such that, on the one hand, the airbags can be filled safely at low ambient temperatures and, on the other hand, the gas pressure does not rise excessively, for example, in intense sunlight, which avoids overstressing the airbags at high temperatures.
- helium has excellent flow properties, which enables airbags to be connected to the accumulator via lines of appropriate length.
- an airbag filled with helium has excellent damping properties, as a result of which the impact load on a person to be protected and in particular the HIC factor (head injection criterion) can be reduced.
- FIG. 1 shows an overview of a cold gas generator with schematically illustrated airbags
- FIG. 2 shows a partial cross-sectional illustration of the cold gas generator according to FIG. 1 in the rest position
- FIG. 3 shows the arrangement shown in FIG. 2 in the outflow position; 4 shows a cross-sectional illustration of the cold gas generator in the region of a piston;
- Fig. 5 shows a longitudinal section through the area shown in Fig. 4 along the line V-V.
- the cold gas generator 46 comprises a store 1, the interior 2 of which is filled with a gas 3, the gas 3 being helium in the exemplary embodiment shown.
- the interior 2 is divided by three pistons 13 in the region of an end 21 into a partial space 8 and three remaining partial spaces 9.
- the end-side subspace 8 has a closed gas outlet opening 4;
- the other subspaces 9 are each assigned a gas outlet opening 5 arranged on the circumferential side of the store 1.
- an opening mechanism 6 is provided, which is held in a trigger housing 39.
- the memory 1 has in its central part 11 a cylindrical circumferential wall 12 extending along a longitudinal axis 10, which is closed at the front end 21 by the trigger housing 39 and at the opposite end 36 by a cover 37.
- a filling valve 38 is provided in the cover 37.
- the pistons 13 are connected to one another via tubular piston rods 16 and can be moved together from their shown rest position 14 into an indicated outflow position 15 in the direction of the longitudinal axis 10.
- P 02 s D. d tr ⁇ ⁇ 3 ⁇ ⁇ ⁇ i 1 rt 3 ⁇ 3 p.
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Air Bags (AREA)
- Prostheses (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002505238A JP2004501823A (ja) | 2000-06-29 | 2001-06-21 | エアバックシステムのための冷ガス発生器 |
BRPI0111957-5A BR0111957B1 (pt) | 2000-06-29 | 2001-06-21 | gerador de gás frio para um sistema de airbag. |
EP01943529A EP1296858B1 (de) | 2000-06-29 | 2001-06-21 | Kaltgasgenerator für ein airbag-system |
DE50102149T DE50102149D1 (de) | 2000-06-29 | 2001-06-21 | Kaltgasgenerator für ein airbag-system |
AT01943529T ATE265341T1 (de) | 2000-06-29 | 2001-06-21 | Kaltgasgenerator für ein airbag-system |
US10/248,212 US6814371B2 (en) | 2000-06-29 | 2002-12-27 | Cold gas generator for an airbag system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10031750A DE10031750A1 (de) | 2000-06-29 | 2000-06-29 | Kaltgasgenerator für ein Airbag-System |
DE10031750.2 | 2000-06-29 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/248,212 Continuation US6814371B2 (en) | 2000-06-29 | 2002-12-27 | Cold gas generator for an airbag system |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002000477A1 true WO2002000477A1 (de) | 2002-01-03 |
Family
ID=7647251
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2001/006991 WO2002000477A1 (de) | 2000-06-29 | 2001-06-21 | Kaltgasgenerator für ein airbag-system |
Country Status (7)
Country | Link |
---|---|
US (1) | US6814371B2 (de) |
EP (1) | EP1296858B1 (de) |
JP (1) | JP2004501823A (de) |
AT (1) | ATE265341T1 (de) |
BR (1) | BR0111957B1 (de) |
DE (2) | DE10031750A1 (de) |
WO (1) | WO2002000477A1 (de) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10239778B3 (de) * | 2002-08-29 | 2004-02-12 | Trw Airbag Systems Gmbh & Co. Kg | Kaltgasgenerator |
DE10243864B3 (de) * | 2002-09-20 | 2004-04-29 | Autoliv Development Ab | Gasgenerator für Airbags und andere Rückhaltevorrichtungen |
US7328914B2 (en) * | 2003-05-29 | 2008-02-12 | Daicel Chemical Industries, Ltd. | Inflator |
US7338073B2 (en) * | 2004-08-18 | 2008-03-04 | Daicel Chemical Industries, Ltd. | Inflator |
US7520531B2 (en) * | 2006-02-28 | 2009-04-21 | Autoliv Asp, Inc. | Inflator device pressure relief |
FR2953008B1 (fr) * | 2009-11-25 | 2011-12-02 | Livbag | Generateur de gaz a gaz reactifs |
DE102012217718A1 (de) | 2011-09-30 | 2013-04-04 | Diehl Bgt Defence Gmbh & Co. Kg | Pyrotechnische Kaltgasgeneratoren |
AT13000U1 (de) | 2011-11-03 | 2013-03-15 | Isi Automotive Austria Gmbh | Gassack mit druckentlastungskammer |
DE112014003721T5 (de) * | 2013-08-12 | 2016-04-28 | Tk Holdings, Inc. | Druckbeaufschlagter Aktor |
US10518733B2 (en) * | 2017-08-18 | 2019-12-31 | Ford Global Technologies, Llc | Seat with airbag |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2324571A1 (de) * | 1972-05-19 | 1973-11-29 | Gen Motors Corp | Insassen-rueckhaltesystem |
DE4231522A1 (de) * | 1992-09-21 | 1994-03-24 | Diehl Gmbh & Co | Seitlicher Airbag zum Schutz von Personen in Fahrzeugen |
DE19929046A1 (de) * | 1999-06-25 | 2001-01-04 | Autoliv Dev | Mehrkammerairbag mit Mehrkammergasgenerator |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3642303A (en) * | 1970-02-13 | 1972-02-15 | Gen Motors Corp | Vehicle occupant restraint system |
US4215878A (en) * | 1978-05-08 | 1980-08-05 | Farrokh Hirbod | Bumper-air bag |
US4275901A (en) * | 1978-07-21 | 1981-06-30 | Honda Giken Kogyo Kabushiki Kaisha | Inflatable safety bag system for vehicles |
JPH0318669U (de) * | 1989-06-30 | 1991-02-25 | ||
US5273309A (en) * | 1992-06-19 | 1993-12-28 | General Motors Corporation | Air bag for side impact |
US5482315A (en) * | 1994-06-07 | 1996-01-09 | Morton International, Inc. | Large L/D ratio tubular hybrid gas generator for the inflation of air bags |
JP3306230B2 (ja) * | 1994-06-28 | 2002-07-24 | 宮田工業株式会社 | エアバッグ装置 |
US5556128A (en) * | 1994-11-24 | 1996-09-17 | Volkswagen Ag | Safety arrangement for a vehicle occupant |
US5593180A (en) * | 1995-04-24 | 1997-01-14 | Trw Inc. | Dual chamber inflator for side impact air bag |
DE69507807T2 (de) * | 1995-09-29 | 1999-10-07 | Salvatore Russo | Sicherheitsgurt, kombiniert mit Luftsäcken |
US6039347A (en) * | 1997-02-03 | 2000-03-21 | General Dynamics Armament Systems, Inc. | Liquid propellant airbag inflator with dual telescoping pistons |
US6299203B1 (en) * | 1997-02-03 | 2001-10-09 | Inova Gmbh Technische Entwicklungen | Airbag device in a vehicle and method for activating an airbag device |
DE19739375B4 (de) * | 1997-09-09 | 2005-07-28 | Welz Industrieprodukte Gmbh | Öffnungsvorrichtung für einen Gasdruckbehälter eines Airbags |
US6129380A (en) * | 1998-08-25 | 2000-10-10 | Autoliv Asp, Inc. | Arrangements and methods for inflatable device formation of inflation gas |
FR2788846B1 (fr) * | 1999-01-25 | 2001-10-26 | Livbag Snc | Generateur de gaz hybride muni d'un initiateur a chargement explosif profile |
-
2000
- 2000-06-29 DE DE10031750A patent/DE10031750A1/de not_active Withdrawn
-
2001
- 2001-06-21 EP EP01943529A patent/EP1296858B1/de not_active Expired - Lifetime
- 2001-06-21 WO PCT/EP2001/006991 patent/WO2002000477A1/de active IP Right Grant
- 2001-06-21 AT AT01943529T patent/ATE265341T1/de not_active IP Right Cessation
- 2001-06-21 BR BRPI0111957-5A patent/BR0111957B1/pt not_active IP Right Cessation
- 2001-06-21 DE DE50102149T patent/DE50102149D1/de not_active Expired - Lifetime
- 2001-06-21 JP JP2002505238A patent/JP2004501823A/ja active Pending
-
2002
- 2002-12-27 US US10/248,212 patent/US6814371B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2324571A1 (de) * | 1972-05-19 | 1973-11-29 | Gen Motors Corp | Insassen-rueckhaltesystem |
DE4231522A1 (de) * | 1992-09-21 | 1994-03-24 | Diehl Gmbh & Co | Seitlicher Airbag zum Schutz von Personen in Fahrzeugen |
DE19929046A1 (de) * | 1999-06-25 | 2001-01-04 | Autoliv Dev | Mehrkammerairbag mit Mehrkammergasgenerator |
Also Published As
Publication number | Publication date |
---|---|
EP1296858B1 (de) | 2004-04-28 |
JP2004501823A (ja) | 2004-01-22 |
EP1296858A1 (de) | 2003-04-02 |
US6814371B2 (en) | 2004-11-09 |
DE50102149D1 (de) | 2004-06-03 |
US20030137136A1 (en) | 2003-07-24 |
BR0111957A (pt) | 2003-05-13 |
BR0111957B1 (pt) | 2010-05-18 |
DE10031750A1 (de) | 2002-01-10 |
ATE265341T1 (de) | 2004-05-15 |
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