GAS GENERATOR, ESPECIALLY FOR A VEHICLE SAFETY SYSTEM

Abstract

The invention relates to a gas generator (10), especially for a vehicle safety system, comprising a sleeve (60) positioned inside the gas generator (10) which sleeve has first flow orifices (68) and encloses an ignition chamber (52) including first propellant (50), wherein a combustion chamber (56) filled with a second propellant (54) is connected to the outside of the sleeve (60), the combustion chamber being surrounded by a diffusor (70) located inside the gas generator (10) and having second flow orifices (78), and comprising a baffle plate (12) which has third flow orifices (14) and surrounds the diffusor (70), wherein the sleeve (60), the diffusor (70) and the baffle plate (12) are adhesively bonded to each other.

Claims

1. A gas generator (10), especially for a vehicle safety system, comprising a sleeve (60) positioned inside the gas generator (10) which has first flow orifices (68) and encloses an ignition chamber (52) including a first propellant (50), wherein at the outside of the sleeve (60) there is connected a combustion chamber (56) filled with a second propellant (54) which combustion chamber is surrounded by a diffusor (70) located inside the gas generator (10) and having second flow orifices (78), and comprising a baffle plate (12) which has third flow orifices (14) and surrounds the diffusor (70), wherein the sleeve (60), the diffusor (70) and the baffle plate (12) are adhesively bonded to each other.

2. The gas generator (10) according to claim 1, wherein the sleeve (60), the diffusor (70) and the baffle plate (12) are connected by one single welded joint (15) or by plural welded joints, especially a first welded joint (17) and a second welded joint (18), the welded joints (15, 17, 18) being preferably configured as radially circumferential welded joints.

3. The gas generator (10) according to claim 1, wherein the sleeve (60) is in the form of a substantially hollow-cylindrical component having a front-side first opening (61) and an axially opposed second opening (63), wherein the first opening (61) is closed by the diffusor (70) and a tamping (79) may optionally be positioned between the diffusor (70) and the sleeve (60).

4. The gas generator (10) according to claim 3, wherein the sleeve (60) is closed at its second opening (63) by a holder (46) which preferably receives an igniter (40) and is supported on the same to be displaceable in a displacing direction (V).

5. The gas generator (10) according to claim 1, wherein a plane (E) radially extending through the first flow orifices (68), especially the centers thereof, equally extends through the third flow orifices (14), especially the center thereof, and the second flow orifices (78) are arranged to be spaced apart from the plane (E).

6. The gas generator (10) according to claim 5, wherein, upon activation of the gas generator (10), the sleeve (60) including the first flow orifices (68) can be displaced in a/the displacing direction (V), especially along a longitudinal axis (A) of the gas generator (10), preferably in such a way that the plane (E) is positioned outside the third flow orifices (14), especially between the third and second flow orifices (14, 78).

7. The gas generator (10) according to claim 1, wherein the sleeve (60) has a substantially radially extending first sleeve portion (62) which is adhesively bonded to the inside of a bottom (76) of the diffusor (70) and which is transformed into a conical second sleeve portion (64) tapering toward the sleeve center axis (H) to which a third sleeve portion (66) extending substantially in parallel to the sleeve center axis (H) and including especially the first flow orifices (68) is connected.

8. The gas generator (10) according to claim 1, wherein the baffle plate (12) is closed by a closure bottom (30) and with the latter forms an area of the outer housing of the gas generator (10), and the closure bottom (30) together with the diffusor (70) and the sleeve (60) enclose the combustion chamber (56) especially such that the combustion chamber (56) is configured as a toroidal chamber which, when viewed in the longitudinal section, preferably has sidewalls substantially aligned in parallel to each other and facing the closure bottom (30), the sidewalls being transformed, in the direction facing away from the closure bottom (30), into sidewalls converging relative to each other.

9. The gas generator (10) according to claim 8, wherein the baffle plate (12) is connected to the closure bottom (30) and the diffusor (70) by means of one single, especially radially circumferential, weld (38), and/or the combustion chamber (56) includes an axis of symmetry (Z) which extends through the second flow orifices (78), especially the centers thereof, substantially in parallel to the longitudinal axis (A) of the gas generator (10).

10. The gas generator (10) according to claim 1, wherein the baffle plate (12) is pot-shaped and has a cylindrical first wall portion (22) to which a conical radially inwardly narrowing second wall portion (24) is connected which is transformed into a bottom portion (20) substantially perpendicularly to the longitudinal axis (A) of the gas generator (10), wherein the baffle plate (12) preferably includes a recess (21) in the bottom portion (20) and/or the third flow orifices (14) as slot-shaped substantially rectangular orifices.

11. The gas generator (10) according to claim 1, wherein the diffusor (70) is pot-shaped and has a cylindrical first portion (72) to which a conical radially inwardly narrowing second portion (74) is connected which is transformed into a/the bottom (76) of the diffusor (70) substantially perpendicularly to the longitudinal axis (A) of the gas generator (10) and includes the second flow orifices (78).

12. The gas generator (10) according to claim 1, wherein the baffle plate (12) and the diffusor (70) enclose a pot-shaped gas guiding chamber (58) and/or extend substantially in parallel to each other over the entire area of the/a gas guiding chamber (58), with the exception of the/a recess (21) of the baffle plate (12).

13. The gas generator (10) according to claim 1, wherein, in the case of activation of the gas generator (10), gas formed in the ignition chamber (52) can flow into the combustion chamber (56) only in the radial direction through the first flow orifices (68) of the sleeve (60), and gas formed in the combustion chamber (56) can flow into the/a gas guiding chamber (58) only in the axial direction through the second flow orifices (78) of the diffusor (70), wherein especially areas of the diffusor (70) and of the baffle plate (12) can be displaced along with the sleeve (60) as a structural unit in the displacing direction (V).

14. An airbag module comprising a gas generator (10), an airbag inflatable by said gas generator (10) and a fastener for arranging the airbag module on a vehicle, wherein the gas generator (10) is configured according to claim 1.

15. A vehicle safety system, especially for the protection of a person, for example a vehicle occupant or pedestrian, comprising a gas generator (10), an airbag inflatable by the latter as part of an airbag module, and an electronic control unit by means of which the gas generator (10) can be activated when a trigger situation is given, wherein the gas generator (10) is configured according to claim 1.

Description

[0023] Hereinafter, the invention shall be illustrated in detail by way of example embodiments with reference to the attached schematic figures, wherein:

[0024] FIG. 1 shows a longitudinal section view across a gas generator according to the invention, and

[0025] FIG. 2 shows a three-dimensional representation of the gas generator as shown in FIG. 1.

[0026] In the following, like reference numerals will be used for like and equally acting parts.

[0027] FIG. 1 illustrates a longitudinal section across a gas generator 10 according to the invention having a longitudinal axis A along which the gas generator axially extends and a center axis M, the axes A being shown in FIG. 1 such that they are positioned to be congruent with the center axis M. The gas generator 10 includes a pot-shaped baffle plate 12 having a bottom portion 20 and third flow orifices 14 which are arranged in the baffle plate 12 as material-penetrating openings or breakthroughs. A closure bottom 30 closes the baffle plate 12 on the open side of the baffle plate 12 facing the bottom portion 20. The baffle plate 12 and the closure bottom 30 together form part of an outer housing of the gas generator 10. The baffle plate 12 includes, especially centrally in the area of its bottom 20, a recess 21 which is to be understood as an indentation of the bottom 20 in the direction of the interior of the baffle plate 12. The closure bottom 30 includes an especially central opening 32 which is closed by a holder 46 and an igniter 40 received by the holder 46. Inside the gas generator 10, a sleeve 60 is fastened to the holder 46, wherein especially the holder 46 has a substantially cylindrical portion to which the sleeve 60 is attached with a substantially hollow-cylindrical third sleeve portion 66 shaped to be correspondingly complementary to the portion, in such a way that the sleeve 60 is slidably supported along a longitudinal extension of the holder 46 or along the cylindrical portion of the holder 46 in a displacing direction V away from the closure bottom 30. A second sleeve portion 64 which extends, with an increasing distance from the third sleeve portion 66, conically outwardly, viz. away from a central sleeve center axis H, is connected to the substantially parallel sidewall of the third sleeve portion 66. The second sleeve portion 64 is finally transformed, in an end area of the sleeve 60, into a first sleeve portion 62 extending radially outwardly and substantially perpendicularly to the sleeve center axis H, said sleeve portion 62 inwardly enclosing a first opening 61 of the sleeve 60. The sleeve 60 is in the form of a cavity open to both front sides which, on one front side, includes the first opening 61 and, on the front side opposed thereto, includes a second opening 63 which is enclosed by a corresponding end area of the third sleeve portion 66. Accordingly, the sleeve 60 can also be understood to be a trumpet-type cavity.

[0028] The sleeve 60 is fastened, with its first sleeve portion 62, to a diffusor 70 located inside the gas generator 10 and including second flow orifices 78, especially to a bottom 76 of the diffusor 70 there. A tamping 79, especially in the form of a thin metal foil made from e.g. steel, copper or aluminum, closes the second flow orifices 78 of the diffusor 70 in an idle state of the gas generator 10 in which the gas generator is not or has not yet been activated as intended.

Accordingly, the tamping 79 between the sleeve 60 and the diffusor 70 may be arranged as a full-surface disk-shaped component, as shown in FIG. 1. As an alternative to this, it is also possible, however, for the tamping 79 to be configured as a ring-shaped element (not shown) and to close the second flow orifices 78 of the diffusor 70 such that the tamping 79 is not positioned between the sleeve 60 and the diffusor 70 or, resp., need no longer be positioned there. In other words, with this alternative, the tamping 79 would be arranged over the flow orifices 78 to ensure merely minimum covering, but it would not extend further radially inwardly between the sleeve 60 and the diffusor 70.

[0029] The sleeve 60 encloses an ignition chamber 52 that is filled with a first propellant 50. The ignition chamber 52 is delimited by the sleeve 60, the holder 46 including the igniter 40 and the diffusor 70 and, resp., the tamping 79 applied, especially bonded or welded, to the diffusor 70. The ignition chamber 52 may be understood to be a space formed corresponding to the trumpet shape of the sleeve 60 and may be described as a substantially frustoconical space including a sidewall which converges tapering in the direction of the igniter 40 toward the sleeve center axis H.

[0030] Outside the sleeve 60 and directly adjacent thereto, there is formed a combustion chamber 56 in which a second propellant 54 is disposed. Each of the two propellants, the first and second propellants (50, 54), may comprise, as a fill of individual propellant bodies, e.g. compressed, especially dry-compressed propellant pellets or extruded bodies, but may also be present in the form of broken granules or in the form of a monolithic molded body or in the form of stringed disks or rings. The first and second propellants (50, 54) may be similar with respect to their chemical composition and/or their shape, or else may be different in this respect. The combustion chamber 56 is delimited by the sleeve 60, the diffusor 70 with the tamping 79 fastened there and the closure bottom 30, and may be understood to be a toroidal chamber which, when viewed in the longitudinal section (FIG. 1), preferably has sidewalls substantially aligned in parallel to each other facing the closure bottom 30 which are transformed into sidewalls converging obliquely relative to each other in the direction away from the closure bottom (30). Thus, the combustion chamber 56 surrounds the ignition chamber 52 in a radially circumferential manner.

[0031] Between the diffusor 70 and the baffle plate 12, a ring-shaped filter 80 is positioned and is especially clamped, press-fitted and/or non-positively or positively connected between said two components. The filter 80 takes a shape which is complementary to its contact faces with said two components. In particular, the filter 80 is understood to be a cavity having a cylindrical portion which is especially in the form of a straight circular cylinder, with a frustoconical portion being connected thereto, and having a sidewall which is tapered radially inwardly. The filter 80 may be made from metal, especially in the form of a knitted mesh, a coil or single-layer or multi-layer sheet members, and has the function to cool gas flowing out of the gas generator 10 and/or to filter said gas for particles. When manufacturing the gas generator, for example, the filter 80 may initially be attached or press-fitted onto the diffusor 70, and then the baffle plate 12 may be attached or press-fitted onto the filter 80 or fastened by a press-fit connection thereto, from outside while surrounding the filter 80.

[0032] The sleeve 60 includes first flow orifices 68 which are formed especially in the third sleeve portion 66 as individual material-penetrating openings or breakthroughs, preferably in the form of circular holes. The number of the first flow orifices 68 is four, but it may as well be less or more, with the first flow orifices 68 being preferred to be arranged at equal axial height radially circumferentially on the sleeve 60. The first flow orifices 68, or at least some of them, might also be arranged in the second sleeve portion 64 of the sleeve 60. The first flow orifices 68 constitute a connection for a gas between the ignition chamber 52 and the combustion chamber 56, and preferably are unclosed already in an idle state of the gas generator 10. However, it is also imaginable for the first flow orifices 68 to be closed by a metal foil (not shown) and, in the case of operation, after activation of the gas generator 10, are opened by an internal pressure increasing in the ignition chamber 52 by the metal foil tearing or being locally destroyed.

[0033] Hereinafter, a flow path S of a gas inside the gas generator after activation thereof as intended is described. To simplify matters, in the following merely a gas or a flow of gas or a gas flow is mentioned, wherein always gas formed inside the gas generator and a possible admixture of particles in said gas is meant, as by burn-off or disintegration of a propellant also additional, usually hot particles which may be admixed to said gas are generated apart from hot gas.

Upon activation of the gas generator 10, the igniter 40 including one or more, especially two, contact elements 42 is triggered and, resp., activated by means of a current pulse. Accordingly, a plug connected to a control device (both of which are not shown) is plugged to the gas generator 10, especially into a plug interface 48, and transmits the current pulse from the control device to or into the igniter 40 which in its interior has an element forming pressure and/or particles, such as pyrotechnics, which is surrounded by a cap 44 of the igniter 40. After triggering the igniter 40, such high pressure is built up inside the igniter 40 that the cap 44 opens or breaks, with gas being released into the ignition chamber 52 to ignite the first propellant 50. In FIG. 1, a possible path of a flow of the gas is illustrated by an elongate appropriately shaped line that is interspersed with directional arrows for such flow path S. By the ignition of the first propellant 50 also gas is generated that can enter or flow through the first flow orifices 68 from the ignition chamber 52 into the combustion chamber 56.
The gas that has flown into the combustion chamber 56 then can ignite the second propellant 54 present there, the latter equally generating, by its burn-off, further gas which breaks the tamping 79 by increasing pressure and enables the gas to flow out of the combustion chamber 56 through the second flow orifices 78 of the diffusor 70.
The gas exiting the combustion chamber 56 then flows into a gas guiding chamber 58 which is enclosed by the baffle plate 12 as an outer delimitation and the diffusor 70 as an inner delimitation. In the area of its recess 21, the baffle plate 12 is connected to and contacts the diffusor 70 so that no gas guiding chamber can form in this area. Accordingly, the gas guiding chamber 58 can be understood to be a pot-shaped chamber, in the aforementioned area of the recess 21 a bottom area of said chamber being quasi spared. In particular, over the entire area of the gas guiding chamber 58, the baffle plate 12 and the diffusor 70 extend substantially in parallel to each other, wherein the recess 21 is to be excluded therefrom and, resp., is not to be considered.
After flowing into the gas guiding chamber 58, the gas is guided along the contour of the baffle plate 12 and the diffusor 70 through the filter 80 up to the third flow orifices 14 of the baffle plate 12 through which it then passes and flows into an outer area or into the environment of the gas generator 10.

[0034] On the whole, the afore-mentioned generation and guidance of the gas by way of the arrow symbol for the flow path S can also be described as follows with respect to the direction, especially with respect to one, advantageously several changes of direction of the flow path S.

After activating the gas generator 10, initially by breaking the cap 44 of the igniter 40, a first quantity of gas is released into the ignition chamber 52, substantially in the direction of the bottom 76 of the diffusor 70 facing the breaking cap 44. Then, after a relatively short distance, a reversal of the flow path S substantially by 180° in the direction of the first flow orifices 68 of the sleeve 60 will follow. This flow path is due to the fact that the first flow orifices 68 are the only orifices through which the gas can flow out of the ignition chamber 52. Here, a particular advantage of the specific cone-shaped ignition chamber 52 and, resp., of the correspondingly conical area of the sleeve 60 takes effect, for, as the second sleeve portion 64 is appropriately tapered toward the sleeve center axis H, gas generated in the ignition chamber 52, especially ignition gas for igniting the second propellant 54, can be guided extremely quickly toward or through the first flow orifices 68. The afore-mentioned conical shape results, toward the first flow orifices 68 and in the environment thereof inside the ignition chamber 52, in a nozzle-type narrowing or a nozzle-shaped annular passage toward the first flow orifices 68. In this way, the gas can be advantageously accelerated in the direction of first flow orifices 68 to pass through the first flow orifices 68 as quickly as possible so as to ignite the second propellant 54 in the combustion chamber 56 as effectively as possible and with correspondingly efficient impact.

[0035] The sleeve 60, the diffusor 70 and the baffle plate 12 are adhesively bonded to each other. It is possible for said three components to be interconnected by one single joint, especially one single welded joint 15. The welded joint 15 is provided as a radially circumferential weld or welding extending across the materials of all three components and may especially be a laser weld. When manufacturing the gas generator 10, the three components of sleeve 60, diffusor 70 and baffle plate 12 can be positioned properly relative to each other. After that, by means of suitable laser adjustment, especially focal adjustment of a welding laser, a laser beam can appropriately act upon the three components from the inside of the diffusor 70 or from the outside of the baffle plate 12 so that the three components are adhesively bonded to each other in one single melting area which is symbolically represented by the reference numeral 15 only on one side in the views of FIGS. 1 and 2.

[0036] As an alternative, the sleeve 60, the diffusor 70 and the baffle plate 12 may also be adhesively bonded to each other by plural welded joints, especially a first welded joint 17 and a second welded joint 18. Accordingly, the baffle plate 12 may be bonded to the diffusor 70 by the first welded joint 17, and the diffusor 70 can be bonded to the sleeve 60 by means of the second welded joint 18. In this case, too, the first and second welded joints 17, 18 may be in the form of radially circumferential welded joints and in the Figures are shown only symbolically on one side by a corresponding material bond.

[0037] Thus, the sleeve 60, the diffusor 70 and the baffle plate 12 are connected tightly and non-slidably relative to each other, and thus can advantageously act quasi as an assembled complete component. In particular, during manufacture of the gas generator, said component group comprising the sleeve 60, the diffusor 70 and the baffle plate 12 can be treated as a pre-mounted subassembly.

Further, especially areas of the diffusor 70 and of the baffle plate 12 can be displaced along with the sleeve 60 as a structural unit in the displacing direction V. What is meant here is that, upon or after activation of the gas generator 10, an increasing pressure forming inside the ignition chamber 52 and/or inside the combustion chamber 56 can elastically and/or plastically deform areas of the diffusor 70 and of the baffle plate 12 to the outside. In other words, said areas are bulging and, resp., are deformed to the outside. Such deformation may be desired as intended. In addition, a displacement of the sleeve 60 in the displacing direction V may equally be desired so that, for example, the first flow orifices 66 of the sleeve 60 are equally displaced in the displacing direction V so as to be able to ignite the second propellant 54 more efficiently over a particular longer axial distance through the hot gas which flows through the first flow orifices 66 into the combustion chamber 56. In other words, a hot gas jet flowing through the first flow orifices 66 into the combustion chamber 56 will so-to-speak pass, over a certain axial distance, along the plurality of propellant bodies in the combustion chamber 56 and will ignite them more extensively and more effectively.
Both aforementioned desired effects and, resp., dynamic processes, viz. the bulging and, resp., deforming of the baffle plate 12 and the diffusor 70 and the displacement of the sleeve 60 in the displacing direction V, may advantageously be implemented precisely and without great effort by the fact that the three components of sleeve 60, diffusor 70 and baffle plate 12 are adhesively bonded to each other. The three components cannot be inadvertently displaced or deformed detrimentally relative to each other in the afore-mentioned dynamic processes. The baffle plate 12 and the diffusor 70 are especially deformed and moved to be outwardly bulging while acting together quasi like one single component, and the sleeve 60, while being quasi attached to said two components, is also displaced simultaneously with this movement, without an inadvertent displacement of the sleeve 60 such as e.g. a leakage in the form of a gap between the first sleeve portion 62 and the diffusor 70, being possible to occur.

[0038] FIG. 1 especially illustrates an idle position of the gas generator 10 at which the gas generator 10 has not yet been activated or triggered as intended. The afore-mentioned dynamic processes after activation of the gas generator 10, viz. the bulging or deforming of the baffle plate 12 and the diffusor 70 and the displacement of the sleeve 60 in the displacing direction V, are not shown separately per se. As is evident from FIG. 1, in the idle state of the gas generator 10, a plane E extends through the first flow orifices 68 of the sleeve 60, especially the centers thereof, in the radial direction, wherein the plane E equally extends through the third flow orifices 14 of the baffle plate 12, especially the centers thereof. The second flow orifices 78 of the diffusor 70 are arranged to be spaced apart from the plane E. The plane E is understood to be an imaginary afore-described plane. Upon activation of the gas generator 10, the sleeve 60 including the first flow orifices 68 can be displaced in the displacing direction V such that the plane E is positioned outside the third flow orifices 14 between the third and second flow orifices 14, 78. In this way, the plane E is displaced quasi upwards (reference to FIG. 1) in the direction of the second flow orifices 78.

[0039] The baffle plate 12 may be connected to the closure bottom 30 and the diffusor 70 by means of one single radially circumferential weld 38, as is symbolically indicated in each of the Figures on one side only (on the left in the Figures). Herefrom similar advantages are resulting, as this has been described already further above concerning the single welded joint 15. In addition, with the one single weld 38 the further advantage is resulting that also two components comprising the major part of the outer housing of the gas generator 10, viz. the baffle plate 12 and the closure bottom 30, can be connected as shell-type components quasi enclosing the gas generator 10 in a pressure-resistant manner. In other words, the single weld 38 allows to manufacture not only a major part of the outer housing but, at the same time, also to adhesively fasten a third component which is pressure-loaded upon activation of the gas generator 10, i.e. the diffusor 70.

As an alternative, the three components of baffle plate 12, closure bottom 30 and diffusor 70 may also be adhesively bonded to each other by implementing two separate welds, i.e. a first welded joint 36 between the diffusor 70 and the closure bottom 30 and a second welded joint 37 between the closure bottom 30 and the baffle plate 12. Accordingly, both welded joints 36 and 37 can be configured as radially circumferential welds.

[0040] As shown in FIG. 1, the combustion chamber 56 includes an axis of symmetry Z which extends through the second flow orifices 78, especially the centers thereof, substantially in parallel to the longitudinal axis A of the gas generator 10. As the combustion chamber 56 has such symmetric design, as is visible from FIG. 1, the gas can be advantageously generated, in the case of activation, extremely uniformly in the combustion chamber 56 by burning off the second propellant 56, and then can be guided also homogenously and uniformly inside the combustion chamber 56 and, in such way, can also flow out of the combustion chamber 56 through the second flow orifices 78.

[0041] The baffle plate 12 is pot-shaped and includes a cylindrical first wall portion 22 to which a conical radially inwardly narrowing second wall portion 24 is connected which is transformed into the bottom portion 20 substantially perpendicularly to the longitudinal axis A of the gas generator 10. Over most of its shape, as compared to the afore-described shape or configuration of the baffle plate 12, the diffusor 70 has a relatively similar outline or a similarly complementary contour, as is clearly visible from FIG. 1.

The diffusor, too, is pot-shaped and has a cylindrical first portion 72 to which a conical radially inwardly narrowing second portion 74 is connected which is transformed into the bottom 76 of the diffusor 70 substantially perpendicularly to the longitudinal axis A of the gas generator 10. Thus, the baffle plate 12 and the diffusor 70, and, resp., the contours thereof, extend along a relatively large distance, viz. substantially along the extension of the gas guiding chamber 58 formed by said two components, substantially in parallel to each other. Consequently, the gas guiding chamber 58 has a very homogenous design and, resp., gas can be guided through the gas guiding chamber 58 in an advantageously homogenous manner.

[0042] The closure bottom 30 has an arch 34 which, upon activation of the gas generator 10, may serve as a type of resilient member. As also in this case the closure bottom 30 can be deformed elastically and/or plastically somewhat outwardly by increasing internal pressure inside the gas generator 10, the arch 34 serves as a type of dynamically loadable compensation member which is adapted to absorb or cushion at least a certain proportion of deformation. In so doing, the arch 34 may bend in the direction of the outer area of the gas generator 10 (not shown) and may absorb and, resp., compensate a proportion of respective deformation forces.

[0043] The baffle plate 12 includes an outwardly radially projecting edge or collar which is in the form of a flange 16 and may serve for mounting the gas generator 10 to further components (not shown), such as e.g. components of an airbag module or a vehicle. For this purpose, the flange 16 may include openings or breakthroughs (not shown).

Especially the third flow orifices 14 of the baffle plate 12 are slot-shaped substantially rectangular orifices. Concretely speaking, six of said orifices extend to be radially circumferential, preferably equally spaced from one another, about the periphery of the baffle plate 12. Orifices of this type enable gas to flow out of the gas generator 10 to the environment thereof in an extensive and smoother way than this would be the case with plural smaller orifices. Thus, especially the large-area third flow orifices 14 and, resp., the material of the baffle plate 12 surrounding said orifices are not loaded in an excessively eroding manner by a quickly discharging gas.

[0044] FIG. 2 illustrates the same embodiment of the gas generator 10 as it is shown in FIG. 1, in a perspective view. Here the same reference numerals as in FIG. 1 are used for like and equally acting parts. Especially, in FIG. 2 furthermore an opening or a bore in the flange 16 of the baffle plate 12 is shown which may be used to fasten the gas generator 10 to an airbag module (not shown). In addition, in FIG. 2 a possible configuration of a third flow orifice 14 of the baffle plate 12 is visible which, as already described in the foregoing, may be in the form of an elongate rectangular orifice or of a corresponding slot-shaped orifice.

REFERENCE NUMERALS

[0045] 10 Gas generator [0046] 12 baffle plate [0047] 14 third flow orifice [0048] 15 welded joint [0049] 16 flange [0050] 17 first welded joint [0051] 18 second welded joint [0052] 20 bottom portion [0053] 21 recess [0054] 22 first wall portion [0055] 24 second wall portion [0056] 30 closure bottom [0057] 32 opening [0058] 34 arch [0059] 36 first weld seam [0060] 37 second weld seam [0061] 38 weld [0062] 40 igniter [0063] 42 contact element [0064] 44 cap [0065] 46 holder [0066] 48 plug interface [0067] 50 first propellant [0068] 52 ignition chamber [0069] 54 second propellant [0070] 56 combustion chamber [0071] 58 gas guiding chamber [0072] 60 sleeve [0073] 61 first opening [0074] 62 first sleeve portion [0075] 63 second opening [0076] 64 second sleeve portion [0077] 66 third sleeve portion [0078] 68 first flow orifice [0079] 70 diffusor [0080] 72 first portion [0081] 74 second portion [0082] 76 bottom [0083] 78 second flow orifice [0084] 79 tamping [0085] 80 filter [0086] A longitudinal axis [0087] E plane [0088] H sleeve center axis [0089] M center axis [0090] S flow path [0091] V displacing direction [0092] Z axis of symmetry