CN110217192B

CN110217192B - Gas generator and airbag for a motor vehicle

Info

Publication number: CN110217192B
Application number: CN201910551695.5A
Authority: CN
Inventors: 陈建林
Original assignee: Yanfeng Automotive Safety Systems Co Ltd
Current assignee: Yanfeng Automotive Safety Systems Co Ltd
Priority date: 2019-06-25
Filing date: 2019-06-25
Publication date: 2024-06-25
Anticipated expiration: 2039-06-25
Also published as: WO2020258966A1; CN110217192A

Abstract

The present disclosure relates to a gas generator and an airbag for a motor vehicle. The gas generator includes: a housing having an exhaust port provided at a side of the housing; an igniter assembly and a filter mounted in the housing, wherein a charge and a combustion chamber for containing and burning the gas generating agent are provided around the igniter assembly, and the filter is disposed above the igniter assembly and the charge and the combustion chamber; and a guide member located between the igniter assembly and the filter, the guide member being provided with a guide port for guiding gas generated by combustion of the gas generating agent to a substantially central position of the filter so that the gas can enter the filter from the substantially central position, diffuse within the filter toward an outer periphery of the filter, and be discharged through the exhaust port after flowing out from the outer periphery of the filter. The gas generator can fully utilize the filter, thereby being beneficial to miniaturization and light weight of the gas generator.

Description

Gas generator and airbag for a motor vehicle

Technical Field

The present disclosure relates to the technical field of gas generators. More particularly, the present disclosure relates to a gas generator for an airbag of a motor vehicle, and an airbag including the gas generator.

Background

Gas generators are widely used in the field of safety technology, for example in airbags for motor vehicles or in pretensioned safety belts. Airbags for motor vehicles generally include a gas generator and an inflatable airbag connected to the gas generator. When an emergency situation, such as a collision or rollover, occurs in operation of the vehicle, the gas generator may be triggered and rapidly generate a large amount of gas, which fills the inflatable air bag to inflate the air bag, thereby serving to protect the occupants of the vehicle.

The gas generator may be classified into a pyrotechnic gas generator and a hybrid gas generator according to a gas generation manner. Pyrotechnic gas generators, which generate gas by igniting a gas generating agent, are mainly used in airbags for driver's seats and passenger's seats that prevent frontal collision.

A lighter weight and smaller size of the gas generator is desirable. For the airbag of the driver's seat, since the volume thereof is generally small and the amount of gas generation required is small, the diameter and thickness of the gas generator for the airbag of the driver's seat can be made small and thin (may be less than 35 mm). However, the gas generator of the airbag for an occupant seat is generally made larger in diameter and thicker (up to 55mm or more) because the volume thereof is larger and the amount of gas generation required is larger. Therefore, further weight reduction and miniaturization of the gas generator are particularly advantageous for the gas generator of the airbag for an occupant seat.

The inventors have noted that in the conventional gas generator, the filter is not fully utilized, which results in waste of both the material and the function of the filter, and hinders miniaturization and weight reduction of the gas generator. Specifically, as shown in fig. 1, in a conventional gas generator 1, a filter 2 is generally configured in a cylindrical shape and vertically arranged around a charge and combustion chamber 4. The gas generated by the gas generator first passes through the filter 2 and then is discharged through the gas outlet 6. Therefore, the gas tends to converge toward the exhaust port 6 (as indicated by the arrow). Since the exhaust port 6 is provided near the top of the gas generator, the gas is generally concentrated near the top of the gas generator, resulting in underutilization of the portion of the filter near the bottom of the gas generator.

Accordingly, there is room for improvement in conventional gas generators.

Disclosure of Invention

In a first aspect of the present disclosure, a gas generator is provided. The gas generator may include: a housing having an exhaust port provided at a side portion thereof; an igniter assembly and a filter mounted within the housing, wherein a charge and combustion chamber for containing and burning a gas generant composition therein is disposed about the igniter assembly, the filter being disposed above the igniter assembly and the charge and combustion chamber; and a guide member located between the igniter assembly and the filter, the guide member being provided with a guide port for guiding gas generated by combustion of the gas generating agent to a substantially central position of the filter so that the gas can enter the filter from the substantially central position, diffuse within the filter toward an outer periphery of the filter, and be discharged through the exhaust port after flowing out from the outer periphery of the filter.

According to an embodiment of the present disclosure, the gas generator may further include a rectifying plate disposed above the guide member. The rectifying plate may be provided with openings, the area of which is selected to obtain the pressure required for the combustion of the gas generant in the charge and combustion chamber.

According to an embodiment of the present disclosure, the rectifying plate is further used to form an upper boundary of the charge and the combustion chamber, and gas generated by combustion of the gas generating agent can enter the filter through an opening of the rectifying plate.

According to embodiments of the present disclosure, the guide element may be configured as a seal, which may be configured to include a first portion capable of sealing the charge container of the igniter assembly and a second portion provided with the guide port for guiding the gas.

According to an embodiment of the present disclosure, the guiding element may be configured as a packing, which may be configured as a disc shape and comprises a bottom portion for sealing an ignition charge container of the igniter assembly and a flange portion extending obliquely outwardly from the bottom portion, the flange portion being provided with the guiding port for guiding the gas.

According to an embodiment of the present disclosure, the guide element may comprise a plurality of guide openings.

According to an embodiment of the present disclosure, the shape of the guide opening is configured as a circle, an ellipse, a square, a polygon, or a slit.

According to embodiments of the present disclosure, the pilot port may be sized to confine the gas generant composition within the charge and combustion chamber.

According to embodiments of the present disclosure, the opening of the rectifying plate may be sealed by a sealing element configured to fail when the gas generator is in operation.

According to an embodiment of the present disclosure, the sealing element is configured to be able to be melted away when the gas generator is in operation.

According to an embodiment of the present disclosure, the sealing element may be a sealing metal sheet.

According to an embodiment of the present disclosure, the sealing member may be a sealing aluminum sheet.

According to an embodiment of the present disclosure, the igniter assembly may include a base including a backbone element and an igniter integrally formed with the backbone element by injection molding a plastic material forming an injection molded body, the base being provided with a circumferential groove configured to receive a cylindrical protrusion protruding inward from a housing of the gas generator.

According to an embodiment of the present disclosure, the ring groove may be defined on the outside by the backbone element and on the inside by the injection molded body.

According to an embodiment of the present disclosure, the ring groove may be configured to form a sealing connection structure with the cylindrical protrusion.

According to an embodiment of the present disclosure, the sealing connection structure may be implemented by a sealing ring disposed in the ring groove.

According to an embodiment of the present disclosure, the skeleton element may have a bottom and a first cylindrical portion having a first shoulder, the injection-molded body having a second shoulder, the first shoulder and the second shoulder together forming a groove bottom of the annular groove, and the first shoulder and the second shoulder being configured for supporting directly or indirectly on the cylindrical protrusion.

According to embodiments of the present disclosure, the skeleton element may be made of metal.

According to an embodiment of the present disclosure, the housing may comprise a first housing part configured as a cup-shaped part and a second housing part configured as a cap-shaped part.

According to an embodiment of the present disclosure, the exhaust port may be provided at a side of the second housing part.

According to an embodiment of the present disclosure, the first housing part and the second housing part may be connected by laser welding or friction welding.

In a second aspect of the present disclosure, an airbag for a motor vehicle is provided. The airbag may include an airbag that is capable of being inflated and a gas generator according to the present disclosure, the airbag being in communication with an exhaust port of the gas generator.

Drawings

The above-mentioned features and advantages of the present disclosure, and the manner of attaining them, will become more apparent with reference to the following detailed description of particular embodiments of the disclosure taken in conjunction with the accompanying drawings. In the drawings:

Fig. 1 is a schematic cross-sectional view of a conventional gas generator in the prior art.

Fig. 2 is a schematic cross-sectional view of one embodiment of a gas generator according to the present disclosure.

FIG. 3 is a schematic cross-sectional view of one embodiment of an igniter assembly according to the present disclosure.

Detailed Description

The present disclosure will be described below with reference to the accompanying drawings, which illustrate several embodiments of the present disclosure. It should be understood, however, that the present disclosure may be presented in many different ways and is not limited to the embodiments described below; indeed, the embodiments described below are intended to more fully convey the disclosure to those skilled in the art and to fully convey the scope of the disclosure. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide yet additional embodiments.

It should be understood that the terminology used in the description is for the purpose of describing particular embodiments only, and is not intended to be limiting of the disclosure. All terms (including technical and scientific terms) used in the specification have the meanings commonly understood by one of ordinary skill in the art unless otherwise defined. Well-known functions or constructions may not be described in detail for brevity and/or clarity. As used in this specification, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. The use of the terms "comprising," "including," and "containing" in the specification mean that the recited features are present, but that one or more other features are not excluded.

In the specification, spatial relationship words such as "upper", "lower", "top", "bottom", "front", "rear", "vertical", "horizontal", and the like may describe the relationship of one feature to another feature in the drawings. It will be understood that the spatial relationship words comprise, in addition to the orientations shown in the figures, different orientations of the device in use or operation. For example, when the device in the figures is inverted, features that were originally described as "below" other features may be described as "above" the other features. The device may also be otherwise oriented (rotated 90 degrees or at other orientations) and the relative spatial relationship will be explained accordingly.

The gas generator generally comprises a housing forming a closed pressure vessel space. A gas generating charge for generating a gas and an igniter assembly for igniting the gas generating charge are disposed within the housing for generating a desired gas upon operation of the gas generator. The shell is provided with an exhaust port for discharging gas generated during the operation of the gas generator. A filter is also typically provided within the housing to filter the gas before it is discharged from the gas generator.

One embodiment of a gas generator according to the present disclosure is specifically described with reference to fig. 2, and is generally indicated by reference numeral 10. The gas generator 10 includes a housing 11. The housing 11 is configured to include a first housing part 111 and a second housing part 112. The first housing part 111 is generally cup-shaped, while the second housing part 112 is generally cover-shaped. The first housing part 111 and the second housing part 112 may be connected to each other by welding (e.g. laser welding or friction welding), screwing, snap-fitting and/or other suitable connection means, whereby a closed pressure vessel space is formed. The housing 11 may be configured in a cylindrical shape. The housing 11 may also be configured approximately spherically, such as ellipsoids, etc.

The housing 11 is provided with at least one exhaust port 110 for exhausting the gas generated in the gas generator 10 to the outside when the gas generator 10 is operated. The at least one exhaust port 110 may be provided at a side of the housing 11 at a position near the top of the housing 11. For example, the at least one exhaust port 110 may be provided on a side of the second housing member 112. In the embodiment shown in fig. 2, the housing 11 is provided with a plurality of exhaust ports 110 (two are shown in fig. 2), which exhaust ports 110 are configured to be distributed along the circumferential direction of the second housing part 112, preferably uniformly distributed along the circumferential direction of the second housing part 112.

The exhaust port 110 may be configured as various shaped holes such as circular holes, oval holes, polygonal holes, shaped holes, etc. The exhaust port 110 may also be configured as at least one slit extending in the circumferential direction of the second housing part 112 piece. In order to ensure tightness of the pressure vessel space of the housing, the exhaust port 110 may be sealed with a sealing member in an initial non-operating state. For example, the vent 110 may be sealed with tape or any other suitable sealing element. The tape may be a foil tape.

An igniter assembly 12 is disposed in the housing 11. The igniter assembly 12 may include a base 121, an igniter 122 disposed on the base 121, and a charge container 123 disposed on the base 121 and surrounding the igniter 122. The ignition charge is contained in the ignition charge container 123. The side of the ignition charge container 123 is provided with one or more flame outlets 124 so that when the ignition charge is ignited, the gas generant in the housing 11 is ignited via the flame outlets 124. In the embodiment shown in fig. 2, the ignition charge container 123 is configured in a cylindrical shape.

Although in the implementation shown in fig. 2, only one igniter assembly 12 is disposed in housing 11, it should be noted that two or more igniter assemblies 12 may be disposed in housing 11. The igniter assembly 12 may be disposed at the bottom of the first housing member 111. When only one igniter assembly 12 is provided in the housing 11, the igniter assembly 12 is preferably disposed in the bottom center of the first housing member 111.

The space between the housing 11 and the igniter assembly 12 forms a charge and combustion chamber 20. The gas generant composition is contained within the charge and combustion chamber 20 and is combusted therein.

A filter 13 is also provided in the housing 11. Unlike the filter 2 shown in fig. 1, which is configured cylindrically and vertically disposed about the charge and combustion chamber 4, the filter 13 according to the present disclosure is configured as a solid structure and disposed above the igniter assembly 12 and the charge and combustion chamber 20.

The gas generator 10 according to the present disclosure designs a gas flow path inside the housing 11 such that gas generated by combustion of the charge and the gas generating agent inside the combustion chamber 20 first enters the filter 13 from a substantially central position of the filter 13, then diffuses in the filter 13 toward the outer circumferential direction of the filter 13, and is discharged through the exhaust port 110 provided on the housing 11 of the gas generator 10 after flowing out from the outer circumference of the filter 13.

To achieve the above, the gas generator 10 may include a guide element between the igniter assembly 12 and the filter 13. The guiding element is provided with a guiding opening for guiding the gas generated by the combustion of the gas generant composition to a substantially central position of the filter 13.

In the embodiment shown in fig. 2, the guiding element is configured as a packing 125. The packing 125 has a dual function of sealing the ignition charge container 123 and guiding gas. Specifically, the enclosure 125 is configured in a disk shape and includes a bottom portion 1251 and a flange portion 1252 extending obliquely outward from the bottom portion 1251. The bottom portion 1251 of the enclosure 125 may be at least partially placed in the charge container 123 to seal the charge container, while the flange portion 1252 of the enclosure 125 is located outside of the charge container 123. The flange portion 1252 is provided with a plurality of guide ports 1253 for guiding gas generated by combustion of the charge and the gas generant in the chamber 20 into the region surrounded by the flange portion 1252 and further into the filter 13 from a substantially central position of the filter 13. The plurality of guide ports 1253 may be uniformly or unevenly arranged along the circumferential direction of the flange portion 1252 of the packing 125.

The pilot port 1253 is sized to confine the gas generant composition within the charge and combustion chamber 20. The guide opening 1253 may be configured to have any suitable shape, such as circular, oval, square, polygonal, slit, etc.

Notably, the enclosure 125 may have a different structure than that shown in fig. 2. For example, the enclosure 125 may be configured as a two-piece cylindrical structure that includes a first piece having a bottom wall and capable of being placed in the ignition charge container 123 to seal the ignition charge container and a second piece having the guide port and capable of sitting on top of the ignition charge container 123. The enclosure may also be configured in any other suitable type of structure. Additionally, while the enclosure 125 shown in fig. 2 is constructed as a unitary body, the enclosure 125 may also be constructed from two or more separate components assembled.

A fairing 14 may be provided over the enclosure 125. The rectifying plate 14 is provided with openings 141, and the pressure required for the combustion of the gas generant composition in the charge and combustion chamber can be obtained by selecting the area of the openings 141.

The opening 141 may be configured to allow the gas guided by the guide member to flow through the opening and into the filter 13. For example, the opening 141 may be in the area surrounded by the flange portion 1252 of the enclosure 125. The opening 141 may be configured to have any suitable shape, such as circular, oval, square, etc. The rectifying plate 14 may be welded to the first housing part 111 of the housing 11 to ensure tightness of the charge against the combustion chamber. At the same time, the rectifying plate 14 also serves to delimit the charge from the combustion chamber and to support the filter 13.

The gas generator 10 having the rectifying plate 14 according to the present disclosure is greatly different from the conventional gas generator 1 shown in fig. 1. In the conventional gas generator 1, the area of the gas discharge port 6 is used to control the pressure required for the combustion of the gas generating agent, and thus the gas discharge port 6 cannot be made too large. In the gas generator 10 according to the present disclosure, however, the pressure required for the combustion of the gas generant composition is controlled through the opening 141 of the rectification plate 14, and the exhaust port 110 no longer functions as the pressure required for the combustion of the gas generant composition, thereby enabling the size of the exhaust port 110 to be arbitrarily set. When the area of the exhaust port 110 is set to be sufficiently large, the high-temperature air flow discharged from the exhaust port 110 is dispersed, which greatly reduces damage to the airbag (such as a nylon airbag). Thus, the gas generator 10 according to the present disclosure is much more friendly to the airbag bag than conventional gas generators.

With the above-described structure, when the gas generator 10 is operated, gas generated by combustion of the charge and the gas generating agent in the combustion chamber 20 enters the inner region of the packing 125 through the guide port 1253, enters the filter 13 through the opening 141, diffuses in the filter 13 toward the outer periphery of the filter 13, and is discharged through the exhaust port 110 after flowing out from the outer periphery of the filter 13 (see fig. 2). Such a gas flow path allows gas to flow through substantially the entire filter 13, thereby enabling the filter 13 to be fully utilized. In this way, the use of lighter and thinner filters can achieve the desired filtering function, thereby achieving a lighter weight and a smaller size of the gas generator 10 while reducing the cost of the filters.

In addition, since the packing 125 and the rectifying plate 14 are in the high temperature combustion region, they will absorb much heat, which reduces the burden on the filter 13, thereby contributing to further reduction in the weight of the filter 13.

In the initial non-operating state, the opening 141 of the rectifying plate may be sealed with the sealing member 142 to prevent moisture from entering the gas generator 10 to damp the ignition charge and/or the gas generating charge filled in the gas generator 10. The sealing element 142 is configured to fail (e.g., to be melted or otherwise lose tightness) when the gas generator 10 is in operation so that gas generated by the combustion of the gas generant composition can enter the filter. The sealing element 142 may be configured as a sealing metal sheet that is capable of being melted away during operation of the gas generator 10. In one embodiment, the sealing element 142 may be configured as an aluminum sheet.

Next, one embodiment of the igniter assembly 12 of the gas generator 10 according to the present disclosure is described in more detail with reference to fig. 2. In this embodiment, the base 121 of the igniter assembly may include a backbone element 1211, and the igniter 122 is integrally formed with the backbone element 1211 by injection molding with a plastic material that forms an injection molded body 1212. The skeleton member 1211 has a bottom portion having a central through hole, and a first cylindrical portion 1213 and a second cylindrical portion 1214 extending in opposite directions from the bottom portion. The first cylindrical portion 1213 is partially filled with plastic material to form a first cylindrical section of the injection molded body 1212, the central through hole is filled with plastic material to form a second cylindrical section of the injection molded body 1212, and the second cylindrical portion 1214 is at least partially filled with plastic material to form a third cylindrical section of the injection molded body 1212.

A circumferential groove 1215 is formed between the backbone element 1211 of the igniter assembly 12 and the first cylindrical section of the injection molding 1212. The annular groove 1215 is configured to receive a cylindrical protrusion extending inwardly from the first housing portion 111 of the housing 11 of the gas generator 10 for mounting the igniter assembly 12 on the first housing portion 111. The first cylindrical portion 1213 has a first shoulder and the first cylindrical section of the injection molded body 1212 has a second shoulder, which together form the groove bottom of the annular groove 1215. The first and second shoulders are configured to be directly or indirectly supported on the cylindrical protrusion. A sealing element 1216 may be provided on the groove bottom to achieve a hermetic seal. The sealing element 1216 may be an O-ring seal made of silicone rubber.

The igniter 122 may be disposed in the third cylindrical section of the injection molding 1212. The lead 1222 of the igniter 122 may extend through a through hole provided in the second cylindrical section of the injection body 1212 into a wire harness chamber 1217 provided within the first cylindrical section of the injection body 1212. For example, a plug, not shown, may be inserted into the harness chamber 1217 to establish an electrical connection with the lead 1222.

The skeleton element 1211 may be a small metal component, which may have a simple shape. This makes it possible to use the skeletal member 1211 to injection mold the base 121 of the igniter assembly 12 in large numbers. The skeleton element 1211 may be manufactured by forging or cutting work or the like.

In the igniter assembly 12 according to the present disclosure, the base 121 is formed by injection molding on the skeletal member 1211 separate from the housing 11, so that the conventional metal base, which is complicated in shape and requires cutting processing, can be eliminated, contributing to a reduction in the manufacturing cost of the gas generator. In addition, by mounting the igniter assembly 12 on the cylindrical protrusion of the first housing portion 111 and by providing the sealing member in the annular groove 1215, the problem of poor sealing that may occur with the igniter assembly 12 can be effectively solved. Further, in the igniter assembly 12 according to the present disclosure, the tensile force on the wire harness electrically connected to the lead wire is received by the cylindrical protrusion of the first housing portion 111, solving the problem of insufficient tensile strength that may occur in the second cylindrical section of the existing injection molded igniter assembly.

Fig. 3 illustrates an igniter assembly 12' according to another embodiment of the present disclosure. The igniter assembly 12 'is substantially identical in construction to the igniter assembly 12, except that the skeletal element 1211 of the igniter assembly 12' has only a first cylindrical portion 1213 and no second cylindrical portion 1214.

The assembly process of the gas generator 10 according to the present disclosure is as follows:

Providing a first housing part 111;

Mounting the base 121 of the igniter assembly 12 on the cylindrical protrusion of the first housing member 111, such as press fit, by means of the annular groove 1215;

one end of the ignition charge container 123 is mounted to the base 121 of the igniter assembly 12, such as press-fit to the bottom of the frame member 1211 of the base 121;

filling the ignition charge container 123 with an ignition charge;

mounting the packing 125 to the other end of the ignition powder container 123, for example, press-fitting the bottom portion 1251 of the packing 125 to the inside of the ignition powder container 123;

the gas generating agent is filled in the charging and combustion chamber 20;

The rectifying plates 14 are fitted into the first housing member 111 and are connected to each other by welding. The fairing 14 may compress the various components below the fairing 14 to avoid failure of the sealing element such as might occur if the fit between the base 121 of the igniter assembly 12 and the cylindrical protrusion of the first housing component 111 were loose;

mounting the filter 13 above the rectifying plate 14;

The second housing part 112 is press-fitted to the first housing part 111, and the first and second housing parts are connected to each other (e.g., using laser welding, friction welding, or the like) to form the gas generator 10.

The gas generator 10 according to the present disclosure is intended to be used as a passenger seat gas generator having a large load and a large thickness. However, the gas generator 10 according to the present disclosure may also be used as a driver's seat gas generator.

Although exemplary embodiments of the present disclosure have been described, it will be understood by those skilled in the art that various changes and modifications can be made to the exemplary embodiments of the present disclosure without departing from the spirit and scope of the disclosure. Accordingly, all changes and modifications are intended to be included within the scope of the present disclosure as defined in the appended claims.

Claims

1. A gas generator, the gas generator comprising:

A housing having an exhaust port provided at a side portion thereof;

An igniter assembly and a filter mounted in the housing, wherein the igniter assembly includes an ignition charge container for containing an ignition charge, a charge and a combustion chamber for containing a gas generating charge and causing the gas generating charge to burn therein are provided around the igniter assembly, and the filter is provided above the igniter assembly and the charge and combustion chamber;

a guide element between the igniter assembly and the filter, the guide element being provided with a guide opening for guiding gas generated by combustion of the gas generant composition to a substantially central location of the filter, wherein the guide element is configured as a closure configured as a disc and comprising a bottom portion for sealing an igniter cartridge of the igniter assembly and a flange portion extending obliquely outwardly from the bottom portion, the flange portion being provided with the guide opening for guiding the gas; and

A rectifying plate disposed above the guide element, the rectifying plate being for forming an upper boundary of the charge and combustion chamber and being provided with an opening in an inner region surrounded by a flange portion of the packing, wherein gas generated by combustion of the gas generating agent can enter the filter through the opening of the rectifying plate, and wherein a pressure required for combustion of the gas generating agent in the charge and combustion chamber can be obtained by selecting an area of the opening of the rectifying plate;

Wherein, when the gas generator is operated, the gas generated by the combustion of the gas generating agent enters an inner region surrounded by a flange portion of the packing via a guide port of the packing, enters the filter from the substantially central position via an opening of the rectifying plate, diffuses toward an outer periphery of the filter within the filter, and is discharged via the exhaust port after flowing out from the outer periphery of the filter.

2. The gas generator of claim 1, wherein the guide element comprises a plurality of guide ports.

3. The gas generator of claim 1, wherein the shape of the guide opening is configured as a circle, oval, square, polygon, or slit.

4. The gas generator of claim 1, wherein the pilot port is sized to confine the gas generant composition within the charge and combustion chamber.

5. The gas generator of claim 1, wherein the opening of the rectifying plate is sealed by a sealing element configured to fail when the gas generator is in operation.

6. The gas generator of claim 5, wherein the sealing element is configured to be melted away when the gas generator is in operation.

7. The gas generator of claim 5, wherein the sealing element is a sealing metal sheet.

8. The gas generator of claim 7, wherein the sealing element is an aluminum sealing sheet.

9. The gas generator of claim 1, wherein the igniter assembly comprises a base including a backbone element and an igniter integrally formed with the backbone element by injection molding of a plastic material forming an injection molded body, the base being provided with a circumferential groove configured to receive a cylindrical protrusion extending inwardly from a housing of the gas generator.

10. The gas generator of claim 9, wherein the ring groove is defined on an outer side by the backbone element and on an inner side by the injection molded body.

11. The gas generator of claim 9, wherein the annular groove is configured to form a sealed connection with the cylindrical protrusion.

12. The gas generator of claim 11, wherein the sealing connection is achieved by a sealing ring disposed in the ring groove.

13. The gas generator of claim 9, wherein the skeleton element has a bottom and a first cylindrical portion having a first annular shoulder, the injection molded body has a second annular shoulder, the first and second annular shoulders collectively forming a groove bottom of the annular groove, and the first and second annular shoulders are configured for direct or indirect support on the cylindrical protrusion.

14. The gas generator of claim 9, wherein the skeletal element is made of metal.

15. The gas generator of any one of claims 1 to 14, wherein the housing comprises a first housing part configured as a cup-shaped part and a second housing part configured as a cap-shaped part.

16. The gas generator of claim 15, wherein the gas vent is provided in a side portion of the second housing member.

17. The gas generator of claim 15, wherein the first housing component and the second housing component are connected by laser welding or friction welding.

18. An airbag for a motor vehicle, the airbag comprising an airbag that can be inflated, characterized in that the airbag comprises a gas generator according to any one of claims 1 to 17, the airbag being in communication with an exhaust port of the gas generator.