• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Discoid-shaped pyrotechnic gas generator, comprising: - a casing (10) with diffusion holes (13), - the pyrotechnic material (20) arranged in the casing (10), - filtration means (30) arranged in the housing (10), - confinement means (40; 40 '), arranged in the housing (10) between the pyrotechnic material (20) and the filtering means (30), - drainage means arranged in the housing (10) between the pyrotechnic material (20) and the confinement means (40; 40 '), characterized in that the filtering means (30) are arranged to provide support for a sustained portion of the confinement means (40; 40 ') at the beginning of operation of the gas generator.
    公开号:FR3053456A1
    申请号:FR1656107
    申请日:2016-06-29
    公开日:2018-01-05
    发明作者:Gerald PRIMA
    申请人:Livbag SAS；
    IPC主号:
    专利说明:

    © Publication no .: 3,053,456 (to be used only for reproduction orders)
    ©) National registration number: 16 56107 ® FRENCH REPUBLIC
    NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY
    COURBEVOIE © Int Cl 8 : F42 B 3/04 (2017.01), B 60 R 21/264
    A1 PATENT APPLICATION
    ©) Date of filing: 06.29.16.(© Priority: © Applicant (s): LIVBAG SAS - FR. @ Inventor (s): PRIMA GERALD. ©) Date of availability of the request: 05.01.18 Bulletin 18/01. ©) List of documents cited in the preliminary search report: See the end of this booklet (© References to other related national documents: ® Holder (s): LIVBAG SAS. ©) Extension request (s): © Agent (s): NOVAGRAAF PATENTS.
    Pty GAS GENERATOR.
    FR 3 053 456 - A1 (67) Generator of pyrotechnic gas in discoid form, comprising:
    - a housing (10) with diffusion holes (13),
    - pyrotechnic material (20) arranged in the housing (10),
    - filtration means (30) arranged in the housing (10),
    - containment means (40; 40 d, arranged in the housing (10) between the pyrotechnic material (20) and the filtration means (30),
    - drainage means arranged in the housing (10) between the pyrotechnic material (20) and the confinement means (40; 40 j, characterized in that the filtration means (30) are arranged to provide support for a portion supported containment means (40; 40j at the start of operation of the gas generator.

    GAS GENERATOR
    The present invention relates generally to a gas generator intended to supply inflation gases for a passive automobile safety device, such as a safety cushion otherwise called an airbag. In particular, the invention relates to a pyrotechnic gas generator in which the inflation gases are generated by the combustion of propellant, and which has a disc-shaped housing for receiving the propellant or the pyrotechnic material in the form of loose pellets.
    It is known in the prior art gas generators of discoid shape, such as that disclosed in document EP2195206 A2. In return, the gas generator of this document has in particular an internal structure with a thick plate forming a wall of a combustion chamber and having to withstand high pressure during operation, which increases the costs and the weight on board. vehicle.
    An object of the present invention is to respond to the drawbacks of the documents of the prior art mentioned above and in particular, first of all, to propose a pyrotechnic gas generator which has a simple internal structure and without massive parts, all by presenting a reliable operating mode, and a rapid manufacturing process and without complex operation.
    For this, a first aspect of the invention relates to a pyrotechnic gas generator of discoid shape, comprising:
    - a housing with diffusion holes,
    - pyrotechnic material arranged in the housing,
    - filtration means arranged in the housing,
    - containment means, arranged in the housing between the pyrotechnic material and the filtration means,
    - 2 - drainage means arranged in the housing between the pyrotechnic material and the containment means, characterized in that the filtration means are arranged to provide support for a supported portion of the containment means at the start of operation of the generator gas. The generator according to the present implementation is arranged so that the confinement means bear directly on the filtration means, so that no other support is necessary, so that the internal structure of the gas generator is simplified and lightened. Indeed, the confinement means only have the function of ensuring the sealing of the pyrotechnic material and its deconfinement at a predetermined pressure when the generator is ignited. Thus, the thickness of the confinement means can be reduced without degrading their opening pressure since they are supported by the filtration means. In other words, the filtration means provide controlled deformation and opening of the confinement means by preventing the latter from collapsing, due to the support provided by the filtration means.
    Advantageously, the confinement means comprise at least one seal which seals the chamber containing the pyrotechnic material before igniting the gas generator, and which ruptures at a sufficiently high pressure to guarantee sufficient initial ignition of the pyrotechnic material to have a complete and consistent combustion during the operating time.
    Advantageously, the pyrotechnic material is a bulk load of pellets.
    Advantageously, the pyrotechnic material is a bulk loading of pellets around an ignition device of the gas generator. This improves the ignition of the pyrotechnic material and improves the compactness, in particular axial, of the gas generator. This axial compactness
    -3is particularly sought after for front airbags, drivers and passengers.
    Advantageously, the support provided by the filtration means to the confinement means allows a rupture of an unsupported portion of the confinement means at the start of operation of the gas generator, and this rupture is controlled and repeatable, because the dimension of the unsupported part is imposed by the size of the filtration means which form a support.
    Advantageously, the filtration means provide a crown-shaped support to the confinement means, so as to define an unsupported portion of the disc-shaped confinement means. Such an unsupported portion in the form of a disc has a repeatable pressure and a mode of rupture.
    Advantageously, the unsupported portion of the confinement means is opposite a space left empty by the filtration means.
    Advantageously, the unsupported portion is arranged to rupture by forming petals in the space left free by the filtration means. By breaking, the confinement means form petals which remain attached to the supported portion of the confinement means. Thus, no free debris is created, which guarantees the absence of components ejected towards the safety device.
    Advantageously, the filtration means are a filter in the form of a hollow cylinder.
    Advantageously, the confinement means are linked to the housing in a sealed manner.
    Advantageously, the confinement means have a thickness comprised in a range of values ranging from 0.4 to 0.8 mm with for example at least one portion marked in particular cruciform with a
    -4 thickness remaining at 0.3 ± 0.05mm. The following mechanical characteristics can be provided: resistance to rupture (Rm) comprised in a range of values going from 300MPa to 800MPa, and / or an elongation before rupture (A%) greater than or equal to 16%, and / or an elastic resistance (Re) greater than or equal to 420MPa. An alloy of the type S420MC (1.0980) (standard EN 10149-2-1996) can be provided, for example. Consequently, the rupture of such confinement means takes place between 1 ms and 6 ms after the ignition device has been ignited. It should be noted that such confinement means cannot be opened repeatedly if the filtration means do not define a support on which the confinement means are articulated to open.
    Advantageously, the confinement means have an external dimension greater than or equal to an external dimension of the filtration means. It should be noted that such large confinement means cannot be opened repeatedly if the filtration means do not define a support on which the confinement means are articulated to open.
    Advantageously, at least one face of the filtration means is supported on a wall of the housing.
    Advantageously, the face of the filtration means bearing on the housing is opposite to one face of the filtration means providing support for the confinement means. The filtration means therefore have a mechanical bridge function between the confinement means and the housing. In other words, the filtration means are directly supported on the housing, which avoids having to give them increased rigidity to take up the support forces of the containment means.
    Advantageously, the diffusion holes form nozzles for controlling the combustion of the pyrotechnic material. The generator according to this implementation does not have an internal pilot nozzle. The combustion of the pyrotechnic material is controlled by the diffusion holes,
    -5 which means that the entire internal enclosure is uniformly pressurized: there is no need for a massive internal part to resist pressure. This ensures satisfactory ignition of the pyrotechnic material while retaining the filtration means inside the combustion chamber, in areas of low gas velocities which optimizes the capture of particles produced by combustion.
    Advantageously, each diffusion hole has a diffusion surface of less than 2.3 mm 2 . In addition, the gas generator is not sealed with a seal on the diffusion holes, and this makes it possible to reduce the size of the latter (therefore without affecting the uncapping pressure therefore) to reduce the aggressiveness of the diffusion gas jets on the bag or airbag.
    Advantageously, a space is provided between the filtration means and the diffusion holes. Such a space makes it possible to leave the diffusion holes free, which avoids any disturbance of the diffusion flows. The gas generator then easily complies with the test which consists in igniting the gas generator alone on a flat surface with a displacement which must remain less than 5 m for example. In addition, the inflation of the safety device complies with the specifications, since the diffusion holes are not obstructed and all deliver the same amount of gas.
    Advantageously, the space is provided between a downstream face of the filtration means and a wall of the housing crossed by the diffusion holes and has a thickness at the diffusion holes of at least 1 mm.
    Advantageously, the housing comprises:
    - a base receiving the pyrotechnic material and
    - A diffuser comprising the diffusion holes, welded to the base, and the confinement means are welded to the housing. Such an assembly method makes it possible to obtain a very good seal.
    Advantageously, the base is welded by inertia to the diffuser, and the confinement means comprise means for indexing in rotation.
    - 6 relative to one of the base and the diffuser, so as to be welded by inertia to the other of the base and the diffuser simultaneously with the inertial weld of the base on the cap. According to this implementation, the containment means are indexed to one of the other two parts (one of the base and the diffuser), to be driven by the latter during friction welding, which allows it to be welded. by friction on the other part at the same time. The indexing interface is provided to provide removable or reversible indexing between the confinement means and one of the base and of the diffuser, prior to the friction welding operation. In other words, it suffices to index (by free or force fitting, free or force insertion, snap-fastening for example) the confinement means on or in one of the base and of the diffuser, to obtain a sub intermediate assembly during manufacture, just before friction welding on the other of one of the base and the diffuser. Consequently, it is understood that it is possible during the welding operation to provide a gripping tool only for the base and the diffuser, since the confinement means are indexed by one of the base and of the diffuser. Manufacturing is therefore simplified, faster and requires less investment.
    Advantageously, the confinement means comprise a metal disc and an O-ring arranged to form a seal between the metal disc and the housing. Such an implementation is inexpensive.
    Advantageously, the gas generator comprises an ignition device, and pyrotechnic material is arranged opposite a lateral surface of the ignition device. This makes the gas generator more compact and improves the ignition of the pyrotechnic material by the ignition device.
    Advantageously, the gas generator comprises an ignition device, and pyrotechnic material is arranged facing a side surface of the ignition device, and facing an end of the ignition device.
    Advantageously, pyrotechnic material is in contact with the ignition device. There is therefore no barrier or part to be provided between the pyrotechnic material (loose propellant pellets) and the ignition device, which facilitates manufacture.
    Advantageously, the pyrotechnic material is separated from the confinement element. The drainage means are interposed between the pyrotechnic material and the containment means.
    Advantageously, the filtration means have a central recess, and the housing and / or the confinement means have (s) a centering protuberance engaged with the central recess.
    Alternatively, the filtration means have an external size such as an external diameter, and the housing and / or the confinement means have a centering housing in which the filtration means engage. This guarantees the free space between the filtration means and the diffusion holes by avoiding any displacement of the filtration means during assembly of the gas generator and limits the deformations of the filtration means during operation, deformations which could influence the pressures inside the gas generator.
    In other words, the invention relates to a pyrotechnic gas generator of discoid shape, comprising:
    - a housing with diffusion holes,
    - pyrotechnic material arranged in the housing,
    - filtration means arranged in the housing,
    - containment means, arranged in the housing between the pyrotechnic material and the filtration means,
    - drainage means arranged in the housing between the pyrotechnic material and the confinement means, characterized in that the filtration means are arranged to provide support for a supported portion of the confinement means at the start of operation of the gas generator, and in which a pressure of
    -8 combustion noted P com b measured upstream of the drainage means and a diffusion pressure noted Pdiff measured downstream of the drainage means respect the following ratio:
    Pcomt / Pdiff <I -5.
    In particular, the combustion pressure P com b is measured within a bulk charge of pyrotechnic material, and the diffusion pressure P d iff is measured at the level of an internal diameter of the filtration means.
    Advantageously, the pyrotechnic material is a bulk charge of pyrotechnic material is contained in a base of internal diameter Dp, and a ratio between a height Hp of the charge of pyrotechnic material and the diameter Dp checks:
    Hp / Dp <0.75.
    This implementation guarantees good evacuation of the combustion gases, and homogeneous combustion within the pyrotechnic material load.
    Advantageously, the filtration means are a filter with an internal diameter D1 and a height Hf, and a ratio between the internal diameter D1 and a diameter Dp of the charge of pyrotechnic material checks:
    D1 / Dp> 0.3 and / or Hf / Hp> 0.25.
    This implementation guarantees good circulation of the combustion gases in the filtration means, without causing clamping in the latter.
    A second aspect of the invention relates to a method of assembling a gas generator according to the first aspect of the invention, comprising an ignition device and the housing of which is formed of a base and of a diffuser receiving diffusion holes, the assembly process comprising the steps of:
    -9- attach the ignition device to the base,
    - For example, by gravity charging the pyrotechnic material into the base in contact with the ignition device, through a base loading opening,
    - position the drainage means between the pyrotechnic material and the base loading opening,
    position the containment means above the drainage means and at the level of the loading opening,
    - position the filtration means on the confinement means
    - Weld the diffuser to the chamber so that the filtration means are interposed between the confinement means and a wall of the diffuser and so as to close the loading opening with the confinement means.
    Other characteristics and advantages of the present invention will appear more clearly on reading the following detailed description of two embodiments of the invention given by way of non-limiting examples and illustrated by the appended drawings, in which:
    - Figure 1 shows a section of a first implementation of a gas generator according to the present invention, before operation;
    - Figure 2 shows a section of a second implementation of a gas generator according to the present invention, before operation;
    - Figure 3 shows the gas generator of Figure 1 after operation.
    FIG. 1 represents a gas generator comprising a housing 10 formed by a base 11 welded by inertia to a diffuser 12, which comprises a plurality of diffusion holes 13.
    Inside the housing 10, pyrotechnic material 20 is placed around an ignition device 70 consisting of a case 71 containing pyrotechnic ignition material, an overmolding 72, and pins
    -10connection 73 to receive an electrical firing signal. In other words, the ignition device 70 is here an electro-pyrotechnic igniter.
    Wedging means 60 (a foam wall for example) and drainage means such as a perforated sheet 51 are placed in the base 11 above the pyrotechnic material 20. The drainage means can also be made of metallic knitted fabric , or in wire compacted and shaped adequately to match the internal diameter of the base 11. The drainage means have the function of retaining, upstream of filtration means 30, the pyrotechnic material during its combustion. This allows the combustion of the pyrotechnic material to be controlled. Indeed a movement of pyrotechnic material in contact with the filter would partially obstruct the filter which would limit gas flows and would have the consequence of increasing the pressure in the gas generator which is not desirable in a generator for front applications whose the diameter is generally greater than 40mm. For generators of this diameter, the resistance to pressure requires increases in wall thicknesses which are too penalizing for the total mass of the generator.
    The pyrotechnic material 20 is a bulk load of propellant pellets, but one can consider a monolithic block of propellant.
    The filtration means 30 are arranged in the diffuser 12, and a cover 41 is welded to the diffuser 12 at the same level as the base 11, at a zone S of inertia welding. Thus, the cover 41 and the area S of inertia welding form means 40 for confining the pyrotechnic material 20: the latter is separated or isolated from the diffusion holes 13 in a sealed manner, since the cover 41 is a disc metal directly welded to the diffuser 12.
    Typically, the filtration means 30 are a filter made of perforated sheet and wound on itself, or else a compacted and shaped wire, or else a compacted metallic knitted fabric. As can be seen in FIG. 1, the filtration means 30 have a generally toric shape with a
    -11 internal diameter D1 and an external diameter D2, inserted in a countersink of the cover 41 to be correctly positioned relative to the latter and thus guarantee the final positioning of the filtration means relative to the diffuser 12.
    During the operation of the gas generator, it is therefore necessary to break the cover 41 to release the combustion gases from the pyrotechnic material 20 so that they pass through the filtration means 30 and are diffused by the diffusion holes 13 before inflate a safety cushion, otherwise known as an airbag.
    To this end, the cover 41 has a portion supported by the filtration means, and an unsupported portion at the internal diameter D1.
    Typically, the cover 41 has at the level of the unsupported portion a thickness comprised in a range of values going from 0.4 to 0.8mm with for example at least one portion marked in particular cruciform with a thickness remaining at 0.3 ± 0.05mm. The following mechanical characteristics can be provided: resistance to rupture (Rm) comprised in a range of values going from 300MPa to 800MPa, and / or an elongation before rupture (A%) greater than or equal to 16%, and / or an elastic resistance (Re) greater than or equal to 420MPa. For example, a steel of the type S420MC (1.0980) (standard EN 10149-2-1996) can be provided.
    Consequently, after a phase of ignition of the pyrotechnic material 20 by the ignition device 70, the pressure rises in the compartment of the housing 10 containing the pyrotechnic material 20 and closed by the cover 41, until causing rupture. of the latter, at the level of the unsupported portion, as can be seen in FIG. 3.
    In fact, it can be seen in FIG. 3 that the cover 41 has been broken, by forming petals 42 at the level of the diameter D1 of the filtration means 30. The rupture of the cover 41 is controlled, because the filtration means 30 impose the opening at diameter D1 with the support provided to the portion
    - 12supported by the cover 41 (the stress present in the cover 41 depends directly on the pressure, but also on the value of the diameter D1). The diameter D1 also prevents the propagation of the tearing of the petals 42.
    In addition, the kinematics of rupture are imposed, with a folding or a winding of the petals 42 around the lower edge of the internal diameter of the filtration means 30.
    The support provided by the filtration means 30 therefore imposes the uncapping pressure value, and the kinematics of rupture, which provides a repeatable and reliable ignition, and an absence of free debris. Indeed, the petals 42 remain integral with the cover 41.
    The filtration means 30, sandwiched between the cover 41 and the upper internal face of the diffuser 12, form a mechanical bridge to provide support for the containment means (the cover 41) and avoid having to use a thick sheet . In addition, during operation, the pressure of the combustion gases continuously pushes the cover 41 against the filtration means 30 and against the upper internal face of the diffuser 12, which requires the combustion gases to pass through the means filtration 30, and not between the latter and the diffuser 12 or the cover 41.
    Finally, it should be noted that an empty space d is provided between the filtration means 30 and the diffuser 12, in particular at the level of the diffusion holes 13. This arrangement makes it possible to guarantee that the diffusion holes 13 are never obstructed. even partially by the filtration means 30 and all diffuse an equivalent gas flow. There is no imbalance in flow, hence cancellation of the thrust forces and no movement if the gas generator is ignited alone and without being held in place.
    Typically, the gas generator according to the present invention is used in frontal safety modules (integrated in a vehicle steering wheel or a dashboard to protect an occupant during a frontal impact). The charge of pyrotechnic material 20 can be
    -13 pellets with a diameter of 6.35 mm, and a thickness of between 1.5 mm and 3 mm. The pyrotechnic material can have a combustion speed of approximately 21 mm / s at 20 MPa (and in any case at a pressure below 25MPa). Under these conditions, the combustion pressure Pcomb measured in the base 11 is not much higher than the diffusion pressure Pdiff measured in the internal diameter D1 of the filter 30.
    This result is obtained thanks to the low height of the loading of pellets relative to the internal diameter of the base 11 (the combustion gases do not have to pass through a thick tablet bed), and also thanks to the internal diameter D1 of the filter 30 which allows a large gas flow.
    The Applicant has measured and found that the Pcomb / Pdiff ratio is less than 1.5, at least in the following configurations:
    Example 1 Example 2 Example 3 Hight of Between 23 mm and Between 26 mm and Between 37 mm and loading 28 mm 30 mm 40 mm Diameterinside thebase 11 47 ± 1 mm 50 ± 1 mm 57 ± 1 mm Diameterinside the filter30 18 ± 2 mm 20 ± 2 mm 24 ± 2 mm Thickness offilter 30 10 ± 2 mm 12 ± 2 mm 16 ± 2 mm Number of holesbroadcast 20 to 24 20 30 0 holesdiffusion 1.7 mm 2.2 mm to 2.4 mm 2.9 mm Areaequivalent ofdiffusion 45.4 mm 2 to 54.5 mm 2 76 mm 2 to 90 mm 2 198 mm 2
    The gas generator according to the present invention therefore has a uniform pressure between the base 11 and the interior of the filter 30, which limits the internal forces (because there are few differences in pressure).
    FIG. 2 represents a second implementation of a gas generator according to the invention. In the same way as for the first setting
    -Work, the housing 10 is formed by the base 11 welded to the diffuser 12 by an inertia weld. However, the confinement means 40 ′ here comprise a cover 43 and a seal 44 mounted in the base 11, to ensure a tight barrier between the diffusion holes 13 and the pyrotechnic material 20. The cover 43 can be formed from two parts , as shown, glued or welded or in one piece.
    Finally, the drainage means here comprise a perforated sheet 52 thicker than for the first implementation.
    In the same way as for the first embodiment, the filtration means are sandwiched between the diffuser 12 and the cover 43 to provide support for the latter. Consequently, the unsupported part of the cover 43 can open repeatably in the internal diameter of the filtration means 30, at a repeatable pressure and time, without losing fragments.
    The method of manufacturing the generator of the first or second implementation is almost the same: the base 11 equipped with the ignition device 70 with its upper opening (which will be welded to the diffuser 12 at the end of manufacture) is placed under a device. loading propellant tablets. The propellant tablets are thus dropped by gravity into the base 11 through the opening of the base 11 so as to fill the base 11 with pyrotechnic material. The propellant tablets are therefore placed in bulk around and possibly above the device. ignition 70.
    Once the propellant tablets have been loaded into the base, the wedging means 60, the drainage means and the confinement means can be placed successively in the latter, in this order. The filtration means 30 are then placed on the confinement means, and the diffuser 12 is then welded.
    In the case of the first implementation, the cover 41 is provided with means of engagement with the base 11 to be integral with it
    - 16 less rotation, so that the inertia welding (or friction welding) is simultaneous between the base 11, the diffuser 12 and the cover 41.
    It is understood that this manufacturing process does not require preliminary preparation of the propellant tablets in a sub-assembly (a case containing the tablets for example) produced offline and deposited in the base 11. On the contrary, the propellant tablets can be deposited directly in bulk in the base 11, in contact with the side walls of the latter, and in contact with the ignition device 70. Consequently, the manufacturing process is simple, the gas generator does not include a specific container for the pellets and its volume is reduced to a minimum since there is no free space left between the pellets and the ignition device.
    It will be understood that various modifications and / or improvements evident to those skilled in the art can be made to the various embodiments of the invention described in the present description without departing from the scope of the invention defined by the appended claims. In particular, reference is made to an ignition device 70 which is a single igniter, but it is possible to envisage using a pyrotechnic relay between the igniter and the pyrotechnic material 20. In addition, it should be noted that the means drainage can be in metallic knitted fabric or in compacted wire, which gives them a function of capturing the combustion heat during operation, and of keeping this heat away from the external walls of the gas generator, the latter possibly being in contact with plastics which will then be less exposed to heat.
    权利要求:
    Claims (12)
    [1" id="c-fr-0001]
    1. Disc-shaped pyrotechnic gas generator, comprising:
    - a housing (10) with diffusion holes (13),
    5 - pyrotechnic material (20) arranged in the housing (10),
    - filtration means (30) arranged in the housing (10),
    - containment means (40; 40 '), arranged in the housing (10) between the pyrotechnic material (20) and the filtration means (30),
    - drainage means arranged in the housing (10) between the pyrotechnic material (20) and the confinement means (40; 40 '), characterized in that the filtration means (30) are arranged to provide support for a supported portion of the confinement means (40; 40 ') at the start of operation of the gas generator.
    [2" id="c-fr-0002]
    2. Gas generator according to the preceding claim, in which the unsupported portion of the confinement means (40; 40 ′) faces a space left empty by the filtration means (30).
    [3" id="c-fr-0003]
    3. Gas generator according to the preceding claim, wherein the unsupported portion is arranged to rupture by forming petals (42) in the space left free by the filtration means (30).
    20
    [4" id="c-fr-0004]
    4. Gas generator according to one of the preceding claims, wherein at least one face of the filtration means (30) is supported on a wall of the housing (10).
    [5" id="c-fr-0005]
    5. Gas generator according to the preceding claim, in which the face bearing on the housing (10) is opposite to one face of the means.
    25 filtration (30) providing support to the containment means (40; 40 ').
    [6" id="c-fr-0006]
    6. Gas generator according to one of the preceding claims, in which the diffusion holes (13) form nozzles for controlling the combustion of the pyrotechnic material (20).
    -187. Gas generator according to one of the preceding claims, in which a space (d) is provided between the filtration means (30) and the diffusion holes (13).
    [7" id="c-fr-0007]
    8. Gas generator according to the preceding claim, in which the space (d) is formed between a downstream face of the filtration means (30) and a wall of the housing (10) traversed by the diffusion holes (13) and has a thickness at the diffusion holes (13) of at least 1mm.
    [8" id="c-fr-0008]
    9. Gas generator according to one of the preceding claims 10, in which the confinement means (40; 40 ') are tightly connected to the housing.
    [9" id="c-fr-0009]
    10. Gas generator according to one of the preceding claims, in which the housing (10) comprises:
    - a base (11) receiving the pyrotechnic material (20) and 15 - a diffuser (12) comprising the diffusion holes (13), welded to the base (11), in which the confinement means (40; 40 ') are welded to the housing (10).
    [10" id="c-fr-0010]
    11. Gas generator according to the preceding claim, in which the base (11) is welded by inertia to the diffuser (12), and in which the confinement means (40; 40 ') comprise indexing means in rotation relative to one of the base (11) and of the diffuser (12), so as to be welded by inertia to the other of the base (11) and of the diffuser (12) simultaneously with the inertial welding of the base (11) on the diffuser.
    12. Gas generator according to one of claims 1 to 8, in which the confinement means (40; 40 ′) comprise a metal disc and an O-ring arranged to form a seal between the metal disc and the housing (10 ).
    -1913. Gas generator according to one of the preceding claims, comprising an ignition device (70), and in which pyrotechnic material (20) is arranged facing a lateral surface of the ignition device (70), and / or opposite one end of the ignition device (70).
    [11" id="c-fr-0011]
    14. Gas generator according to one of the preceding claims in which the filtration means (30) have a central recess, and in which the housing (10) and / or the confinement means (40; 40 ') has (s) ) a centering protuberance engaged with the central recess.
    [12" id="c-fr-0012]
    15. Method for assembling a gas generator according to one of the preceding claims, comprising an ignition device (70) and the housing of which is formed by a base (11) and a diffuser (12) receiving the diffusion holes (13), the assembly process comprising the steps consisting in:
    - fix the ignition device (70) to the base (11),
    - Gravity charging the pyrotechnic material (20) into the base (11) in contact with the ignition device (70), through a base loading opening (11),
    - positioning the drainage means between the pyrotechnic material (20) and the base loading opening (11),
    - position the containment means (40; 40 ') above the drainage means and at the level of the loading opening,
    - position the filtration means (30) on the confinement means (40; 40 ’)
    - weld the diffuser (12) to the chamber so that the filtration means (30) are interposed between the confinement means (40; 40 ') and a wall of the diffuser (12) and so as to close off the loading opening with containment means (40; 40 ').
    1/2
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    FR2855769A1|2004-12-10|Gas generator for motor vehicles air bag, has two combustion chambers, each with igniter to ignite gas production agent, and third combustion chamber where sequence of activation of igniters can be adjusted
    FR2768501A1|1999-03-19|ADAPTIVE PYROTECHNIC GAS GENERATOR FOR PROTECTIVE CUSHION WITH NEUTRALIZATION DEVICE
    CA2404836C|2007-06-05|Hybrid gas generator for automotive lateral air-bag restraint system
    FR2877297A1|2006-05-05|PYROTECHNIC GAS GENERATOR FOR MOTOR VEHICLE SAFETY
    EP3313536B1|2019-07-31|Fire extinguisher
    EP3122601B1|2018-08-22|Filter for a gas generator
    FR2877428A1|2006-05-05|PYROTECHNIC GENERATOR WITH TWO COMBUSTION CHAMBERS AND SINGLE IGNITION CHARGE
    WO2018138305A1|2018-08-02|Sealing cap for gas generator device
    WO2015032857A1|2015-03-12|Gas generator
    FR2907732A1|2008-05-02|Gas generator for an automobile airbag comprises supplementary outlets whose caps are blown when the gas generated by a pyrotechnic charge increases the pressure in a pressurized gas reservoir
    EP2740635A1|2014-06-11|Gas generator
    FR2938814A1|2010-05-28|Closed contour hollow body shell element e.g. door trim, for e.g. sub-abdominal retaining system in motor vehicle, has pyrotechnical initiator initiating combustion of gas mixture to generate temperature and pressure rise to deform wall
    FR2885682A1|2006-11-17|PYROTECHNIC GAS GENERATOR
    同族专利:
    公开号 | 公开日
    WO2018002166A1|2018-01-04|
    EP3479050B1|2020-06-03|
    JP2019519431A|2019-07-11|
    EP3479050A1|2019-05-08|
    FR3053456B1|2018-06-29|
    CN109416235A|2019-03-01|
    US20190184931A1|2019-06-20|
    JP6697831B2|2020-05-27|
    引用文献:
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    EP0407248A1|1989-07-05|1991-01-09|S.N.C. Livbag|Cold gas pyrotechnic generator and manufacturing process thereof|
    EP2195206A2|2007-10-03|2010-06-16|Autoliv Development AB|Gas generator with a discoid shape|
    WO2015144634A2|2014-03-28|2015-10-01|Autoliv Development Ab|Filter for a gas generator|
    US5590905A|1994-12-06|1997-01-07|Trw Inc.|Air bag inflator|
    JP2001180428A|1999-12-27|2001-07-03|Daicel Chem Ind Ltd|Gas generator for air bag, and air bag device|
    US20040061319A1|2000-12-26|2004-04-01|Takashi Saso|Gas generator|
    EP1449724B1|2001-11-30|2008-05-28|Daicel Chemical Industries, Ltd.|Inflator|
    CN2900260Y|2006-04-12|2007-05-16|方立敏|Gas generator for driver's safety air sac|
    CN2900259Y|2006-04-12|2007-05-16|方立敏|Mixed gas generator for safety air sac|
    US8662532B2|2010-11-10|2014-03-04|Autoliv Asp, Inc.|Inflator having a mechanically coupled two-piece housing|
    CN203391724U|2013-07-10|2014-01-15|百利得汽车安全系统有限公司|Miniaturized airbag air generator|
    CN203681474U|2014-01-14|2014-07-02|百利得汽车安全系统有限公司|Firework-like gas generator provided with powder box and applied to supplementary restraint system|JP6934372B2|2017-09-05|2021-09-15|株式会社ダイセル|Gas generator|
    CN110217192A|2019-06-25|2019-09-10|延锋汽车智能安全系统有限责任公司|Gas generator and air bag for motor vehicle|
    WO2021262296A1|2020-06-23|2021-12-30|Autoliv Asp, Inc.|Inflator for a passive vehicle safety device and filter for an inflator of a passive vehicle safety device|
    法律状态:
    2017-06-27| PLFP| Fee payment|Year of fee payment: 2 |
    2018-01-05| PLSC| Search report ready|Effective date: 20180105 |
    2018-05-11| TP| Transmission of property|Owner name: AUTOLIV DEVELOPMENT AB, SE Effective date: 20180406 |
    2018-07-02| PLFP| Fee payment|Year of fee payment: 3 |
    2020-06-29| PLFP| Fee payment|Year of fee payment: 5 |
    2021-06-28| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1656107A|FR3053456B1|2016-06-29|2016-06-29|GAS GENERATOR|
    FR1656107|2016-06-29|FR1656107A| FR3053456B1|2016-06-29|2016-06-29|GAS GENERATOR|
    CN201780039811.4A| CN109416235A|2016-06-29|2017-06-28|Gas generator|
    JP2018567130A| JP6697831B2|2016-06-29|2017-06-28|Gas generator|
    US16/310,191| US20190184931A1|2016-06-29|2017-06-28|Gas generator|
    PCT/EP2017/066046| WO2018002166A1|2016-06-29|2017-06-28|Gas generator|
    EP17732474.6A| EP3479050B1|2016-06-29|2017-06-28|Gas generator|
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