WO2009147233A1 - A pyrotechnic gas generator with combustion and diffusion chambers of different sections - Google Patents

A pyrotechnic gas generator with combustion and diffusion chambers of different sections Download PDF

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Publication number
WO2009147233A1
WO2009147233A1 PCT/EP2009/056928 EP2009056928W WO2009147233A1 WO 2009147233 A1 WO2009147233 A1 WO 2009147233A1 EP 2009056928 W EP2009056928 W EP 2009056928W WO 2009147233 A1 WO2009147233 A1 WO 2009147233A1
Authority
WO
WIPO (PCT)
Prior art keywords
combustion chamber
chamber
fact
generator according
diffusion
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.)
Ceased
Application number
PCT/EP2009/056928
Other languages
French (fr)
Inventor
Yvonnig Patton
François Peremarty
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.)
Autoliv Development AB
Original Assignee
Autoliv Development AB
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 Autoliv Development AB filed Critical Autoliv Development AB
Priority to BRPI0913602A priority Critical patent/BRPI0913602A2/en
Priority to CN200980120426.8A priority patent/CN102046433B/en
Priority to JP2011512141A priority patent/JP5656027B2/en
Priority to US12/995,786 priority patent/US8794666B2/en
Priority to DE112009001307T priority patent/DE112009001307T5/en
Publication of WO2009147233A1 publication Critical patent/WO2009147233A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • B60R21/23—Inflatable members
    • B60R21/239—Inflatable members characterised by their venting means
    • 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
    • B60R21/261—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 with means other than bag structure to diffuse or guide inflation fluid

Definitions

  • the present invention relates to a pyrotechnic has generator intended for motor vehicle safety.
  • Said generator is preferably intended to allow inflating of a safety cushion generally called an airbag.
  • Generators which comprise a combustion chamber of cylindrical or approximately cylindrical shape, in which an initiator is contained associated with at least one solid pyrotechnic charge. Said generator also comprises a diffusion chamber which communicates with the combustion chamber; it receives gases generated by the charge and transfers these gases externally (here to an airbag) via at least one evacuation orifice.
  • the securing of said generator to a vehicle requires a container with frangible or mobile wall of substantial size to receive both this generator and the airbag that is folded away and is intended to be inflated.
  • the present invention relates to a pyrotechnic gas generator intended for motor vehicle safety, which comprises a combustion chamber of cylindrical or approximately cylindrical shape, in which an initiator is contained associated with at least one solid pyrotechnic charge, and a diffusion chamber which communicates with the combustion chamber, and which receives the gases generated by said charge and transfers these gases towards the outside via at least one evacuation opening.
  • said diffusion chamber extends parallel to the longitudinal axis of said combustion chamber, in the continuation of one of its ends;
  • - is also of generally cylindrical or approximately cylindrical shape but whose cross section is shorter than that of said combustion chamber; is devoid of gas filtering means for the gases passing through it.
  • said combustion and diffusion chambers extend along the same axis; - the cross-section of the said diffusion chamber is about one half shorter than that of said combustion chamber; said combustion chamber is essentially delimited by a box-shaped part with open top, and by a lid closing this top part which forms one piece with said diffusion chamber; it is provided with at least one protective cap that gives way only when the predetermined gas pressure is reached in the combustion chamber; said protective cap is arranged in the transition area between the two chambers; said protective cap extends inside the diffusion chamber and seals said evacuation orifice.
  • figure 1 is a sectional view along a longitudinal, median plane of a first embodiment of the generator
  • figure 2 is a similar view to figure 1 of a second embodiment of said generator.
  • the generator in figure 1 has a longitudinal axis of symmetry XX' .
  • This generator 1 essentially consists of a casing 2, and a lid 7 which are made in metal.
  • the casing 2 is of essentially cylindrical shape having an axis XX' , and consists of a bottom part 22 which extends generally crosswise relative to the above-mentioned axis.
  • This bottom part connects to and is joined in one piece with a side wall 20 centred on axis XX' .
  • the upper part of this wall referenced 21 is flanged 90° outwardly to form a peripheral flange.
  • the bottom part 22 has an extension 24 extending opposite to the opening 23 and this extension comprises an axial opening 240 with circular contour in which the holder 3, 4 of an electropyrotechnic initiator 5 is partly engaged.
  • the initiator 5 extends inside the casing 2 and is centred on axis XX' .
  • the casing 2 materializes the combustion chamber C of the generator 1.
  • a pyrotechnic charge 6 is placed in this chamber, the charge shown here being monolithic.
  • This form of embodiment is well known and is used to house the initiator 5 of the charge 6 in the above- mentioned channel.
  • the above-described casing 2 is completed by a lid 7 which, in this embodiment, is in a single piece with the diffusion chamber D of the generator.
  • the lid has a generally planar bottom part 72 perpendicular to axis XX' , which is joined to a side wall with revolution surface 70 which itself is extended by a wide peripheral flange 71 flanged 90° outwardly. It will be noted that the diameter of the lid 7 is greater than the diameter of the casing 2 at the flange 21.
  • peripheral flange 71 which ensures sealing of the combustion chamber C.
  • the side wall with surface of revolution 70 is pierced with openings 700 which communicate with the outside and whose function is to allow evacuation of the gases received by the diffusion chamber and which are generated at the combustion chamber. These openings or nozzles also ensure guiding of the combustion of the pyrotechnic charge. In manner known per se, the surface of these openings is sized in relation to the desired performance of the generator. In the embodiment shown here, these openings 700 are sealed by a metal rupture disk 8 arranged on the inner side of the wall 70.
  • the diffusion chamber D therefore projects relative to the combustion chamber
  • the diffusion chamber is devoid of filtering means for the gases originating from the combustion chamber.
  • a pyrotechnic charge 6 which generates very few of such particles.
  • said generator contains relatively few constituent parts. Additionally, since its diffusion chamber D is much less voluminous than the combustion chamber, it is possible to place only the diffusion chamber and the airbag in a casing contained in the vehicle's dashboard, it being possible to place the combustion chamber outside this casing. Therefore the size of this casing can be reduced
  • the structure is substantially equivalent to the structure shown figure 1. Therefore elements common to these two embodiments will not be further described.
  • the casing 2 has a larger diameter that may even be greater than its longitudinal dimension.
  • this casing contains a pyrotechnic charge 6' in the form of pellets and a packing material 9 whose function is to immobilize said pellets inasmuch as is possible .
  • the free upper end 200 of the side wall with surface of revolution 20 of the casing 2 forms a rim against which a grid G is placed i.e. an openwork plate whose function is to allow the gases to pass whilst retaining pellet pieces which would tend to endeavour to escape from the combustion chamber C.
  • the lid 7 has a relatively similar structure to the lid shown figure 2 except that the flange 71 is flanged two consecutive times to form edges 73 and 74 which tightly surround the rim 200 of the casing 2.
  • a metal rupture disk 8 (protective cap) is fixed opposite the openings 700 of the diffusion chamber and inside the latter.
  • Said rupture disk is designed to yield as soon as a required pressure is reached in the combustion chamber C. To avoid the escaping of fragments from said rupture disk into the airbag, it can be envisaged to position this disk not opposite the openings 700 but in the transition area between chamber C and chamber D i.e. just at the inlet to chamber D.
  • the advantages of said generator lies in its reduced size and weight, in its simplified design and in its easy installing which is made possible both at the driving position of a vehicle and opposite a passenger seat.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Air Bags (AREA)

Abstract

This present invention relates to a pyrotechnic gas generator intended for motor-vehicle safety, which includes a combustion chamber (C) of cylindrical or approximately cylindrical shape, in which is present an initiator (5) associated with at least one solid pyrotechnic charge (6), as well as a diffusion chamber that communicates with the combustion chamber (C), and that receives the gases generated by the said charge (6) and transfers them to the outside via at least one evacuation opening (700). According to the invention, the said diffusion chamber (D) : extends parallel to the longitudinal axis (X, X' ) of the said combustion chamber (C), in the extension of one of its end faces; is also of generally cylindrical or approximately cylindrical shape, but with a cross section that is less than that of the said combustion chamber; and is devoid of means for filtering the gases that pass through it.

Description

A PYROTECHNIC GAS GENERATOR WITH COMBUSTION AND DIFFUSION CHAMBERS OF DIFFERENT SECTIONS
The present invention relates to a pyrotechnic has generator intended for motor vehicle safety.
Said generator is preferably intended to allow inflating of a safety cushion generally called an airbag.
Generators are known which comprise a combustion chamber of cylindrical or approximately cylindrical shape, in which an initiator is contained associated with at least one solid pyrotechnic charge. Said generator also comprises a diffusion chamber which communicates with the combustion chamber; it receives gases generated by the charge and transfers these gases externally (here to an airbag) via at least one evacuation orifice.
Said generators are generally satisfactory. However, the majority thereof consist of relatively numerous parts and items of equipment.
Additionally, the securing of said generator to a vehicle requires a container with frangible or mobile wall of substantial size to receive both this generator and the airbag that is folded away and is intended to be inflated.
This is not acceptable when the generator is intended to equip a vehicle whose public retail price is relatively low, and for which it is sought to reduce the cost price of this set of equipment. The purpose of the present invention is to overcome these difficulties by proposing a generator which functions in fully conventional manner, but whose structure is simplified and whose mounting inside a vehicle dashboard is made possible using a container of smaller volume. Therefore, the present invention relates to a pyrotechnic gas generator intended for motor vehicle safety, which comprises a combustion chamber of cylindrical or approximately cylindrical shape, in which an initiator is contained associated with at least one solid pyrotechnic charge, and a diffusion chamber which communicates with the combustion chamber, and which receives the gases generated by said charge and transfers these gases towards the outside via at least one evacuation opening.
This generator is noteworthy in that said diffusion chamber: extends parallel to the longitudinal axis of said combustion chamber, in the continuation of one of its ends;
- is also of generally cylindrical or approximately cylindrical shape but whose cross section is shorter than that of said combustion chamber; is devoid of gas filtering means for the gases passing through it.
According to other advantageous, non-limiting characteristics : said combustion and diffusion chambers extend along the same axis; - the cross-section of the said diffusion chamber is about one half shorter than that of said combustion chamber; said combustion chamber is essentially delimited by a box-shaped part with open top, and by a lid closing this top part which forms one piece with said diffusion chamber; it is provided with at least one protective cap that gives way only when the predetermined gas pressure is reached in the combustion chamber; said protective cap is arranged in the transition area between the two chambers; said protective cap extends inside the diffusion chamber and seals said evacuation orifice. Other characteristics and advantages of the present invention will become apparent on reading the following description of some preferred embodiments.
This description is made with reference to the appended drawings in which: - figure 1 is a sectional view along a longitudinal, median plane of a first embodiment of the generator; figure 2 is a similar view to figure 1 of a second embodiment of said generator. The generator in figure 1 has a longitudinal axis of symmetry XX' .
This generator 1 essentially consists of a casing 2, and a lid 7 which are made in metal.
The casing 2 is of essentially cylindrical shape having an axis XX' , and consists of a bottom part 22 which extends generally crosswise relative to the above-mentioned axis.
This bottom part connects to and is joined in one piece with a side wall 20 centred on axis XX' . The upper part of this wall referenced 21 is flanged 90° outwardly to form a peripheral flange.
The top of this casing is open, the corresponding opening being referenced 23.
The bottom part 22 has an extension 24 extending opposite to the opening 23 and this extension comprises an axial opening 240 with circular contour in which the holder 3, 4 of an electropyrotechnic initiator 5 is partly engaged. These elements, whose structure is known per se, will not be further described. By means of this assembly, the initiator 5 extends inside the casing 2 and is centred on axis XX' .
The casing 2 materializes the combustion chamber C of the generator 1. A pyrotechnic charge 6 is placed in this chamber, the charge shown here being monolithic.
It is a solid block of propellant of cylindrical shape comprising an axial cylindrical channel 60.
This form of embodiment is well known and is used to house the initiator 5 of the charge 6 in the above- mentioned channel.
The above-described casing 2 is completed by a lid 7 which, in this embodiment, is in a single piece with the diffusion chamber D of the generator.
In the present case, the lid has a generally planar bottom part 72 perpendicular to axis XX' , which is joined to a side wall with revolution surface 70 which itself is extended by a wide peripheral flange 71 flanged 90° outwardly. It will be noted that the diameter of the lid 7 is greater than the diameter of the casing 2 at the flange 21.
It is this peripheral flange 71 which ensures sealing of the combustion chamber C.
Any means known to persons skilled in the art can be used to secure the lid 7 to the casing 2. Friction welding may be considered for example.
The side wall with surface of revolution 70 is pierced with openings 700 which communicate with the outside and whose function is to allow evacuation of the gases received by the diffusion chamber and which are generated at the combustion chamber. These openings or nozzles also ensure guiding of the combustion of the pyrotechnic charge. In manner known per se, the surface of these openings is sized in relation to the desired performance of the generator. In the embodiment shown here, these openings 700 are sealed by a metal rupture disk 8 arranged on the inner side of the wall 70.
In this specific embodiment, the diffusion chamber D therefore projects relative to the combustion chamber
C at one of its ends, and has a cross-section which is substantially one half smaller than the cross-section of the combustion chamber.
Also, according to the invention, the diffusion chamber is devoid of filtering means for the gases originating from the combustion chamber.
To limit the percentage of solid particles which may escape from the diffusion chamber, use is preferably made of a pyrotechnic charge 6 which generates very few of such particles.
As can be ascertained, said generator contains relatively few constituent parts. Additionally, since its diffusion chamber D is much less voluminous than the combustion chamber, it is possible to place only the diffusion chamber and the airbag in a casing contained in the vehicle's dashboard, it being possible to place the combustion chamber outside this casing. Therefore the size of this casing can be reduced
In the embodiment shown figure 2, the structure is substantially equivalent to the structure shown figure 1. Therefore elements common to these two embodiments will not be further described. However, the casing 2 has a larger diameter that may even be greater than its longitudinal dimension. Also, this casing contains a pyrotechnic charge 6' in the form of pellets and a packing material 9 whose function is to immobilize said pellets inasmuch as is possible .
The free upper end 200 of the side wall with surface of revolution 20 of the casing 2 forms a rim against which a grid G is placed i.e. an openwork plate whose function is to allow the gases to pass whilst retaining pellet pieces which would tend to endeavour to escape from the combustion chamber C. The lid 7 has a relatively similar structure to the lid shown figure 2 except that the flange 71 is flanged two consecutive times to form edges 73 and 74 which tightly surround the rim 200 of the casing 2.
Here too a metal rupture disk 8 (protective cap) is fixed opposite the openings 700 of the diffusion chamber and inside the latter.
Said rupture disk is designed to yield as soon as a required pressure is reached in the combustion chamber C. To avoid the escaping of fragments from said rupture disk into the airbag, it can be envisaged to position this disk not opposite the openings 700 but in the transition area between chamber C and chamber D i.e. just at the inlet to chamber D. The advantages of said generator lies in its reduced size and weight, in its simplified design and in its easy installing which is made possible both at the driving position of a vehicle and opposite a passenger seat.

Claims

1. A pyrotechnic gas generator intended for motor-vehicle safety, which includes a combustion chamber (C) of cylindrical or approximately cylindrical shape, in which is contained an initiator (5) associated with at least one solid pyrotechnic charge (6, 1O'), as well as a diffusion chamber (D) that communicates with the combustion chamber (C) , and that receives the gases generated by the said charge (6, 6') and transfers them to the outside via at least one evacuation opening (700), characterised by the fact that the said diffusion chamber (D)
-extends parallel to the longitudinal axis (X, X' ) of the said combustion chamber (C) , in the extension of one of its ends;
- is also of generally cylindrical or approximately cylindrical shape, but with a cross section that is less than that of the said combustion chamber (C) ;
- and is devoid of any means for filtering the gases that pass through it.
2. A generator according to claim 1, characterised by the fact that the said combustion chamber (C) and diffusion chamber (D) extend along the same axis (X, X' ) .
3. A generator according to one of the previous claims, characterised by the fact that the cross section of the said diffusion chamber (D) is less than about half that of the said combustion chamber (C) .
4. A generator according to one of the previous claims, characterised by the fact that the said combustion chamber (C) is essentially formed by a box- shaped part (2) open at the top, and by a lid (7) for closure of this top, which is of one piece with the said diffusion chamber.
5. A generator according to one of the previous claims, characterised by the fact that it is provided with at least one protective cap (8) that gives way only when the predetermined gas pressure is reached in the combustion chamber (C) .
6. A generator according to claim 5, characterised by the fact that the said protective cap (8) is placed in the transition zone between the two chambers (C, D) .
7. A generator according to claim 5, characterised by the fact that the said protective cap (8) extends to the inside of the diffusion chamber (D) and closes off the said evacuation opening (700) .
PCT/EP2009/056928 2008-06-06 2009-06-05 A pyrotechnic gas generator with combustion and diffusion chambers of different sections Ceased WO2009147233A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BRPI0913602A BRPI0913602A2 (en) 2008-06-06 2009-06-05 a pyrotechnic gas generator with combustion and diffusion chambers of different sections
CN200980120426.8A CN102046433B (en) 2008-06-06 2009-06-05 A pyrotechnic gas generator with combustion and diffusion chambers of different sections
JP2011512141A JP5656027B2 (en) 2008-06-06 2009-06-05 Pyrotechnic gas generator with different sections of combustion chamber and diffusion chamber
US12/995,786 US8794666B2 (en) 2008-06-06 2009-06-05 Pyrotechnic gas generator with combustion and diffusion chambers of different sections
DE112009001307T DE112009001307T5 (en) 2008-06-06 2009-06-05 Pyrotechnic gas generator with combustion chamber and diffusion chamber of different cross section

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0853779A FR2932136B1 (en) 2008-06-06 2008-06-06 PYROTECHNIC GAS GENERATOR WITH COMBUSTION AND DIFFUSION CHAMBERS OF DIFFERENT SECTIONS
FR0853779 2008-06-06

Publications (1)

Publication Number Publication Date
WO2009147233A1 true WO2009147233A1 (en) 2009-12-10

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PCT/EP2009/056928 Ceased WO2009147233A1 (en) 2008-06-06 2009-06-05 A pyrotechnic gas generator with combustion and diffusion chambers of different sections

Country Status (8)

Country Link
US (1) US8794666B2 (en)
JP (1) JP5656027B2 (en)
KR (1) KR20110015426A (en)
CN (1) CN102046433B (en)
BR (1) BRPI0913602A2 (en)
DE (1) DE112009001307T5 (en)
FR (1) FR2932136B1 (en)
WO (1) WO2009147233A1 (en)

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KR101886613B1 (en) * 2010-09-10 2018-08-09 가부시키가이샤 한도오따이 에네루기 켄큐쇼 Light-emitting element and electronic device
JP5985950B2 (en) * 2012-10-04 2016-09-06 株式会社ダイセル Gas generator and its assembly method
FR3045811B1 (en) 2015-12-18 2017-12-29 Livbag Sas GAS GENERATOR
CN108146383B (en) * 2017-12-21 2020-02-07 湖北航天化学技术研究所 Tablet, gas generator and gas generating equipment
US11370384B2 (en) 2019-08-29 2022-06-28 Autoliv Asp, Inc. Cool burning gas generant compositions with liquid combustion products
US11760303B2 (en) * 2021-04-19 2023-09-19 Autoliv Asp, Inc. Initiator for a gas generator of vehicle safety device

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Also Published As

Publication number Publication date
US8794666B2 (en) 2014-08-05
JP5656027B2 (en) 2015-01-21
DE112009001307T5 (en) 2011-04-14
BRPI0913602A2 (en) 2015-11-24
CN102046433B (en) 2014-04-02
KR20110015426A (en) 2011-02-15
US20110083576A1 (en) 2011-04-14
FR2932136B1 (en) 2010-08-20
JP2011521846A (en) 2011-07-28
FR2932136A1 (en) 2009-12-11
CN102046433A (en) 2011-05-04

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