WO2020259164A1

WO2020259164A1 - Detonation device module, gas generator and air bag

Info

Publication number: WO2020259164A1
Application number: PCT/CN2020/092079
Authority: WO
Inventors: 陈建林
Original assignee: 延锋汽车智能安全系统有限责任公司
Priority date: 2019-06-25
Filing date: 2020-05-25
Publication date: 2020-12-30
Also published as: CN110228440A

Abstract

A detonation device module used for a gas generator. The detonation device module comprises a detonation device (12) and a skeleton element (11). The detonation device (12) forms a whole with the skeleton element (11) by means of injection molding with plastic materials, and the plastic materials form an injection molding body (13). The detonation device module has a ring groove (19) which is defined by the skeleton element (11) at the outer side and by the injection molding body (13) at the inner side; the ring groove (19) is constructed for receiving a tubular bulge (21) that extends inwards from a housing of the gas generator. Further provided is a gas generator having the detonation device module (10) and an air bag having the gas generator. The detonation device module can be manufactured economically, can be easily assembled onto the gas generator and can work reliably.

Description

Igniter module, gas generator and airbag

Technical field

The present invention relates to an igniter module for a gas generator, a gas generator including such an igniter module, and an airbag including such a gas generator.

Background technique

Gas generators are widely used in the field of safety technology, especially in airbags. In addition, it can also be used in pre-tensioned seat belts, for example. An airbag used in a motor vehicle usually includes a gas generator and an inflatable air bag connected to the gas generator. When a motor vehicle is running in an emergency situation, such as a collision or a rollover, the gas generator can be triggered and quickly produce a large amount of gas. The gas is filled into an inflatable air bag. The inflated air bag protects the vehicle occupants effect.

In some gas generators, gas can be produced by igniting the gas-producing agent. Such gas generators can be called pyrotechnic gas generators. In some gas generators, ignition powder may be arranged around the ignition device, wherein the ignition powder can be ignited by the ignition device, and then the burning ignition powder causes the ignition and combustion of the gas generating powder. The ignition powder may be composed the same as or different from the gas generating powder. For example, ignition powder can have better flammability than gas generating powder. In some gas generators, a large amount of gas can be generated by mixing at least two components and following a chemical reaction of these components.

A gas generator is known from patent document CN204279333U, which includes a shell and an ignition module directly injection molded on the shell. The inventor of the present application discovered in research that the following defects exist in this gas generator:

1. During the injection molding process, due to the cooling of the injection molded body, a gap may be formed between the injection molded body and the metal surface of the shell, which may affect the sealing performance of the gas generator. When the moisture in the atmosphere penetrates into the gas generator through the gap, it may invalidate the gas generating medicine, thereby affecting the working performance of the gas generator. The gas generator may even fail completely or there is a risk of explosion at any time.

2. Where the lead wire of the igniter passes through the housing, the injection molded body may have a cylinder with a diameter of several millimeters. If there is a gap between the injection molded body and the metal shell surface, the possible tensile force will directly act on the cylinder. Since the cylinder has a small cross-section, the cylinder may have insufficient tensile strength. If some small voids are formed in the center of the cylinder due to cooling during the injection molding process, the defect of insufficient tensile strength will be more serious.

3. The size of the ignition device is significantly smaller than the size of the housing part of the gas generator. In the manufacturing process of such a gas generator, the ignition device and the shell parts with very different sizes are put together in the injection molding machine for injection molding, which is low in production efficiency. At the same time, higher requirements are put forward for the degree of cleaning of the shell components to meet the needs of the injection molding process.

In addition, a gas generator is known from the patent document US6718884B1. In this gas generator, there are similarly the disadvantages discussed above.

Summary of the invention

Starting from the prior art, the purpose of the present invention is to provide an ignition device module for a gas generator, a gas generator including such an ignition device module, and a safety device including such a gas generator The airbag, in which the igniter module can be manufactured inexpensively, can be easily assembled, and work reliably.

According to the first aspect of the present invention, an ignition device module for a gas generator is proposed. The ignition device module includes an ignition device, the ignition device module includes a skeleton element, and the ignition device is passed through The injection molding of a plastic material is integrated with the skeleton element, the plastic material forms an injection molded body, the igniter module has a ring groove, the ring groove is defined on the outside by the skeleton element and on the inside by the injection molded body, the ring groove is configured It is configured to receive a cylindrical protrusion protruding inward from the housing of the gas generator.

In this kind of ignition module, the size ratio of the skeleton element and the ignition device is significantly smaller than the size ratio of the shell component and the ignition device in the prior art. Therefore, the ignition device module according to the present invention can be used in injection molding. More efficient manufacturing in the process.

In some embodiments, the skeleton element may be made of metal, ceramic, glass, or other suitable materials. For example, the frame element can be stamped and/or machined from a metal plate. In some embodiments, the injection molding material may be a thermoset or thermoplastic plastic, or may be a fiber reinforced plastic. The igniter itself may adopt those already known from the prior art.

In some embodiments, the ring groove may be configured to form a sealed connection structure between the ring groove and the cylindrical protrusion. For example, a sealing material can be applied to at least one of the groove bottom and/or two groove walls of the ring groove, or an airtight press fit can be formed between the ring groove and the cylindrical protrusion, or the sealing connection The structure can be realized by a sealing ring arranged in the ring groove. The sealed connection structure according to the present invention can effectively avoid the safety hazards caused by leaks in the prior art.

In some embodiments, the skeleton element may have a bottom portion and a first cylindrical portion partially filled with an injection molded body, and the first cylindrical portion defines the annular groove on the outside.

In some embodiments, the first cylindrical portion may have a first ring shoulder, the injection molded body may have a second ring shoulder, and the first ring shoulder and the second ring shoulder may form a groove of the ring groove Bottom, the first ring shoulder and the second ring shoulder may be configured to directly or indirectly support on the cylindrical protrusion. In this embodiment, the tensile force that may be applied to the wire harness that is electrically connected to the lead wire of the igniter can be transmitted to the cylindrical protrusion through the second ring shoulder, thus overcoming the previous problems in the prior art. Describe the defects of insufficient strength and the safety risks that may arise from it.

In some embodiments, the body of the igniter may be disposed on a side of the bottom that is away from the first cylindrical part and may be partially surrounded by an injection molded body.

In some embodiments, the bottom may have a through hole, the lead wire of the igniter may pass through the through hole, and the through hole may be filled with an injection molded body.

In some embodiments, the skeleton element may include a second cylindrical portion disposed on a side of the bottom that is away from the first cylindrical portion, and the second cylindrical portion may surround a section of the injection molded body . The second cylindrical part can advantageously realize the press-fitting of the ignition cartridge on the ignition module.

In some embodiments, the second cylindrical part may be an integral part of the skeleton element; or the second cylindrical part may be installed on the skeleton element as a separate component. For example, the second cylindrical member may be press-fitted on the skeleton element, more precisely, it may be press-fitted on the rest of the skeleton element.

In some embodiments, the number of the igniter may be one, and the number of the second cylindrical part may be one.

The number of the igniter may be two, and the number of the second cylindrical part may be two, wherein the two second cylindrical parts are arranged side by side with each other and respectively surround a section of the injection molded body, One of the igniters is correspondingly arranged in the section.

It is also possible that the igniter module includes 3 or more igniters. It is also possible that a second cylindrical part can be equipped with more than one igniter.

In some embodiments, the bottom portion may have a through hole, the lead of the igniter passes through the through hole, and the through hole is filled with an injection molded body; and the injection molded body may include: a A first cylindrical section in a cylindrical portion and integrally connected with the bottom and/or the first cylindrical section, and/or a second cylindrical section received in the through hole and/or a A third columnar section received in the second cylindrical portion and integrally connected with the bottom and/or the second cylindrical portion.

In some embodiments, the bottom may have two through holes, each through hole is passed through by a lead wire of one of the igniters, and the through hole is filled with an injection molded body; and the injection molded body may include: a receiving A first columnar section in the first cylindrical part and integrally connected with the bottom and/or the first cylindrical part, and/or two second columnar sections respectively received in one of the through holes And/or two third cylindrical sections respectively received in one of the second cylindrical portions and integrally connected with the bottom and/or the corresponding second cylindrical portion.

In some embodiments, the injection molded body may have a wire harness cavity, and the end of the lead wire of the igniter extends into the wire harness cavity.

According to a second aspect of the present invention, a gas generator is proposed. The gas generator includes a casing having an exhaust port, the casing having a cylindrical protrusion projecting inward, the gas The generator includes an igniter module for a gas generator according to the present invention, the igniter module receiving the cylindrical protrusion in its annular groove.

In some embodiments, the igniter module may be press-fitted on the cylindrical protrusion. In addition, it is also possible that the igniter module may be welded or threaded to the cylindrical protrusion.

In some embodiments, the housing may include a first housing part and a second housing part.

In some embodiments, the first housing part may be configured as a cup-shaped part, and the second housing part may be configured as a cover-shaped part.

In some embodiments, the first housing part may have the cylindrical protrusion, and the second housing part may have the exhaust port.

In some embodiments, the gas generator may include an ignition cartridge for receiving ignition powder, the ignition cartridge may be press-fitted on the second cylindrical portion, and may be covered by the second shell The body part is compressed directly or indirectly.

In the meaning of the present invention, ignition powder can be understood as a medicament that directly interacts with an ignition device; gas generating powder can be understood as a medicament that can be ignited by burning ignition powder; and an ignition cartridge can be understood as a container for receiving ignition powder .

The ignition powder may be composed the same as or different from the gas generating powder in terms of its composition and/or physical form. For example, the ignition powder can have the same composition as the gas generating powder, but is more refined, and therefore has better flammability.

In the case of a single-stage gas generator, the ignition powder can generally have better flammability than the gas generating powder. In the case of a two-stage gas generator, the ignition powder of the first stage can usually have better flammability than the gas generating agent; if the second stage is designed to be triggered later than the first stage, it will be in the first stage during operation. The combustion in the first stage can cause the ignition cartridge of the second stage to heat up. This increase in temperature can increase the flammability of the second stage ignition powder. Therefore, it is possible that the second stage ignition powder can be the same as the gas generating agent This can be advantageous in terms of cost.

According to a third aspect of the present invention, an airbag for a motor vehicle is proposed. The airbag includes an inflatable airbag, the airbag includes the gas generator according to the present invention, and the airbag can be combined with The exhaust port of the gas generator is connected.

It should be pointed out here that the technical features described in this application can be combined with each other arbitrarily, as long as they are not mutually contradictory. All technically feasible feature combinations are the technical content recorded in this application.

Description of the drawings

Hereinafter, the present invention will be explained in more detail with reference to specific embodiments in conjunction with the drawings. The schematic drawings are briefly described as follows:

Figure 1 is a longitudinal sectional view of a gas generator according to a first embodiment of the present invention;

Figure 2 is a longitudinal sectional view of a gas generator according to a second embodiment of the present invention;

Figure 3 is a longitudinal sectional view of a gas generator according to a third embodiment of the present invention;

4 is a longitudinal sectional view of the ignition device module of the gas generator according to the third embodiment;

Figure 5 is a longitudinal sectional view of a gas generator according to a fourth embodiment of the present invention; and

Fig. 6 is a longitudinal sectional view of a gas generator according to a fifth embodiment of the present invention.

Detailed ways

Fig. 1 is a longitudinal sectional view of a gas generator according to a first embodiment of the present invention. The gas generator includes a housing, which may be constructed in multiple pieces, for example, may be constructed in two pieces, including a first housing part 1 and a second housing part 2. In the embodiment shown in FIG. 1, the first housing member 1 is configured as a cup-shaped member, and the second housing member is configured as a lid-shaped member. The first housing part 1 has a cylindrical protrusion 21, which may have a circular or rectangular profile, for example. The second housing part 1 has a plurality of exhaust ports 6, which can be respectively configured as exhaust holes or slits. The filter 3 is received in the housing. The filter 3 is generally constructed in a cylindrical shape. The filter 3 and the housing jointly define a charge chamber for containing the gas generating drug. An ignition cartridge 4 can be provided in the charge chamber, and the ignition cartridge 4 contains the ignition cartridge. The ignition cartridge can be press-fitted with its end facing the first housing part 1 to the ignition which will be described in detail below.器module 10 on. The charging chamber can be defined by a charging chamber cover 5 which can be press-fitted to the end of the ignition cartridge facing the second housing part 2 and can be pressed by the second housing part 2. The ignition charge can be ignited, and then the generated flame is transferred to the charge chamber outside the ignition charge cylinder 4, causing the gas generating charge to burn. The gas generated during the combustion of the gas generating agent can be filtered by the filter 3, and then can be discharged through the exhaust port 6 into an air bag of an airbag not shown, for example, so that the air bag is converted from the folded state to the expanded state, which is expanded Air bags can provide safety protection.

In the gas generator shown in FIG. 1, the ignition device module 10 includes an ignition device 12, the ignition device module includes a skeleton element 11, the ignition device 12 is formed by injection molding plastic material with the skeleton element 11 In one piece, the plastic material forms an injection molded body 13. The skeleton element 11 has a bottom 18, a first cylindrical portion 16 and a second cylindrical portion 17, and the bottom 18 has a central through hole. The first cylindrical portion 16 is partially filled by the first cylindrical section of the injection molded body 13, the through hole is at least partially filled by the second cylindrical section of the injection molded body 13, and the second cylindrical portion 17 is The third cylindrical section of the injection molded body 13 is at least partially filled.

The ignition module 10 has a ring groove 19 which is defined on the outside by the first cylindrical portion 16 of the skeleton element 11 and on the inside by the first cylindrical section 13 of the injection molded body, the ring groove 19 19 is configured to receive a cylindrical protrusion 21 protruding inward from the housing of the gas generator. The first cylindrical portion 16 has a first ring shoulder, the injection molded body 13 has a second ring shoulder, and the first ring shoulder and the second ring shoulder together form the groove bottom of the ring groove 19, the The first ring shoulder and the second ring shoulder are configured to be directly or indirectly supported on the cylindrical protrusion 21. For example, a sealing ring 15, such as an O-shaped sealing ring made of silicone rubber, may be provided on the groove bottom, thereby achieving an airtight seal.

The body of the igniter 12 may be disposed on the side of the bottom 18 away from the first cylindrical portion 16 and partially surrounded by the injection molded body 13. The lead 14 of the igniter 12 can pass through the through hole in the bottom 18. A harness chamber 20 may be provided in the first columnar section of the injection molded body 13. The end of the lead 14 may extend into the harness chamber. For example, an unshown plug can be inserted into the harness chamber 20 to establish an electrical connection with the lead 14 of the igniter. The igniter 12 can detonate the ignition charge received in the ignition cartridge 4 when activated.

Fig. 2 is a longitudinal sectional view of a gas generator according to a second embodiment of the present invention. The housing and filter of the gas generator can be constructed similarly to the embodiment according to FIG. 1. Here, the gas generator includes two ignition cartridges 4, wherein the first ignition cartridge 4 receives the ignition powder and is used to ignite the gas generating agent in the charge chamber outside the two ignition cartridges 4, and The second ignition cartridge 4 can constitute a separate sub-charge chamber. More precisely, the charge chamber outside the two ignition cartridges 4 may be called the first sub-charge chamber, and the charge chamber inside the second ignition cartridge 4 may be called the second sub-charge chamber . The gas that can be generated in the second dispensing chamber can be discharged into the first dispensing chamber first, and then discharged from the exhaust port 6 through the filter 3. It can be understood that the ignition powder can be partially or completely the same as or different from the gas generating powder. For example, the ignition powder can have better flammability. It is possible that the ignition charge in the first ignition cartridge 4 is completely different from the gas generating charge in the first sub-charge chamber, and the ignition charge in the second ignition cartridge 4 is in contact with the ignition device 12 The adjacent area can be configured the same as the ignition charge in the first ignition cartridge 4, and the remaining area of the second sub-charge chamber is configured the same as the gas generating charge in the first sub-charge chamber . In addition, it is also possible that the ignition powder in the entire second ignition cartridge 4 can be constituted the same as the gas generating powder in the first sub-charge chamber. For example, in the case that the second stage including the second ignition cartridge 4 and the corresponding igniter 12 is designed to be triggered later than the first stage including the first ignition cartridge 4 and the corresponding igniter 12, The combustion in the first stage will cause the second ignition cartridge 4 to heat up. This increase in temperature can increase the flammability of the ignition charge in the second ignition cartridge 4, so it is in line with the gas production in the first sub-charge chamber. The ignition powder in the second ignition cartridge 4, which has the same composition, can be reliably ignited when the temperature is raised. In this case, the ignition powder in the second ignition powder cartridge 4 may also be referred to as "gas generating powder".

In the gas generator shown in Figure 2, the ignition device module 10 includes two ignition devices 12, the ignition device module includes a skeleton element 11, the two ignition devices 12 by using plastic injection molding and skeleton The element 11 is formed in one piece, and the plastic material forms an injection molded body 13. The skeleton element 11 has a bottom 18, a first cylindrical portion 16 and two second cylindrical portions 17, and the bottom 18 has two through holes. The first cylindrical portion 16 is partially filled with a first columnar section of the injection molded body 13, the two through holes are at least partially filled with each second columnar section of the injection molded body 13, and the two The two cylindrical portions 17 are at least partially filled with each third cylindrical section of the injection molded body 13. Here, the second cylindrical portion 17 may be installed on the skeleton element 11 as a separate component.

The ignition module 10 has a ring groove 19 which is defined on the outside by the first cylindrical portion 16 of the skeleton element 11 and on the inside by the first cylindrical section 13 of the injection molded body, the ring groove 19 19 is configured to receive a cylindrical protrusion 21 protruding inward from the housing of the gas generator. The first cylindrical portion 16 has a first ring shoulder, the injection molded body 13 has a second ring shoulder, the first ring shoulder and the second ring shoulder together form the bottom of the ring groove 19, the first The ring shoulder and the second ring shoulder are configured to be directly or indirectly supported on the cylindrical protrusion 21. For example, a sealing ring 15, such as an O-shaped sealing ring made of silicone rubber, may be provided on the groove bottom, thereby achieving an airtight seal.

The bodies of the two igniters 12 are arranged on the side of the bottom 18 away from the first cylindrical portion 16 and are partially surrounded by the injection molded body 13. The lead wires 14 of the two igniters 12 can pass through corresponding through holes in the bottom 18. Two harness cavities 20 may be provided in the first columnar section of the injection molded body 13. The end of the lead 14 may extend into the corresponding harness cavity. For example, an unshown plug may be inserted into the harness chamber 20 to establish an electrical connection with the lead 14 of the igniter. The igniter 12 can detonate the ignition charge received in the corresponding ignition cartridge 4 when activated.

Fig. 3 is a longitudinal sectional view of a gas generator according to a third embodiment of the present invention, and Fig. 4 is a longitudinal sectional view of an ignition device module of the gas generator. The difference between the embodiment according to FIG. 3 and the embodiment according to FIG. 1 may only be that the igniter module 10 according to FIGS. 3 and 4 differs from the igniter module 10 according to FIG. 1, wherein, according to FIGS. 3 and There is no second cylindrical portion 17 in the igniter module 10 of FIG. 4. It goes without saying that similarly, at least one of the two second cylindrical portions 17 in the embodiment according to FIG. 2 can also be eliminated.

Fig. 5 is a schematic longitudinal sectional view of a gas generator according to a fourth embodiment of the present invention. The main difference between this embodiment and the embodiment according to Fig. 1 lies in the ignition module. In the embodiment shown in FIG. 5, the axial protrusion of the ignition module is only partially surrounded by the second cylindrical portion 17 of the skeleton element, in other words, the injection molded body 13 formed of injection molding material protrudes in the axial direction. The area extends beyond the second cylindrical part 17 of the skeleton element. In other respects, please refer to the description of FIG. 1.

Fig. 6 is a schematic longitudinal sectional view of a gas generator according to a fifth embodiment of the present invention. The main difference between this embodiment and the embodiment according to Fig. 2 lies in the ignition module. In the embodiment shown in FIG. 6, the two axial protrusions of the ignition module are only partly surrounded by the second cylindrical part 17 of the skeleton element. In other words, the injection molded body 13 formed of injection molding material is axially The raised area extends beyond the second cylindrical portion 17 of the skeleton element. In other respects, reference can be made to the description of FIG. 2.

In the above embodiment, the skeleton element 11 may be a small metal part having a simple shape, for example, it may be manufactured by forging and cutting. The first cylindrical portion 16 of the skeleton element 11 may be press-fitted on the cylindrical protrusion 21 in an interference fit manner. The sealing ring 15 can establish an airtight seal. The exhaust port 6 can be temporarily closed, and the closure can be broken by a rapid increase in pressure inside the housing. It is particularly advantageous that the length of the ignition cartridge 4 can be appropriately designed so that the ignition cartridge 4 is tightly pressed between the second housing part 2 and the igniter module 10, preventing the ignition cartridge 10 and the first The possible looseness between a housing part 1 therefore also ensures a particularly reliable sealing function of the sealing ring 15.

Finally, it should be pointed out that the above-mentioned specific embodiments are only used to understand the utility model, and do not limit the protection scope of the utility model. For those skilled in the art, modifications can be made on the basis of specific implementations, and these modifications do not depart from the protection scope of the present invention.

Claims

An ignition device module for a gas generator, the ignition device module comprising an ignition device (12), characterized in that the ignition device module includes a skeleton element (11), the ignition device ( 12) It is integrated with the skeleton element (11) by injection molding with a plastic material, the plastic material forms an injection molded body (13), and the ignition module has a ring groove (19) on the outside by the skeleton element ( 11) Defined and internally defined by an injection molded body (13), the ring groove (19) is configured to receive a cylindrical protrusion (21) protruding inward from the housing of the gas generator.
The ignition module for a gas generator according to claim 1, wherein the ring groove (19) is configured to form a seal between the ring groove (19) and the cylindrical protrusion (21) Connection structure

Preferably, the sealing connection structure is realized by a sealing ring (15) arranged in the ring groove (19).
The ignition module for a gas generator according to any one of claims 1 to 2, characterized in that the skeleton element (11) has a bottom (18) and a first cylindrical portion (16), The first cylindrical portion (16) is partially filled with an injection molded body (13), and the first cylindrical portion (16) defines the ring groove (19) on the outside; and/or

The first cylindrical portion (16) has a first ring shoulder, the injection molded body (13) has a second ring shoulder, and the first ring shoulder and the second ring shoulder together form the bottom of the ring groove , The first ring shoulder and the second ring shoulder are configured to be directly or indirectly supported on the cylindrical protrusion (21); and/or

The body of the ignition device (12) is arranged on the side of the bottom (18) away from the first cylindrical portion (16) and is partially surrounded by the injection molded body (13); and/or

The bottom (18) has a through hole, the lead (14) of the igniter passes through the through hole, and the through hole is filled with an injection molded body (13); and/or

The skeleton element (11) includes a second cylindrical portion (17) provided on the side of the bottom (18) that is away from the first cylindrical portion (16), and the second cylindrical portion (17) ) The section surrounding the injection molded body (13);

Preferably, the second cylindrical part (17) is an integral part of the skeleton element (11); or the second cylindrical part (17) is installed as a separate component on the skeleton element (11). )on.
The ignition module for a gas generator according to claim 3, wherein the number of the ignition device (12) is one, and the number of the second cylindrical portion (17) is 1; and/or

The bottom (18) has a through hole, the lead (14) of the igniter passes through the through hole, and the through hole is filled with an injection molded body (13); and/or

The injection molded body (13) includes: a first cylindrical section received in the first cylindrical portion (16) and integrally connected with the bottom (18) and/or the first cylindrical portion (16) , A second cylindrical section received in the through hole and a second cylindrical section (17) received in the bottom (18) and/or the second cylindrical portion (17) integrally Connected third columnar section.
The ignition device module for a gas generator according to claim 3, wherein the number of the ignition device (12) is two, and the number of the second cylindrical portion (17) is 2, wherein the two second cylindrical parts (17) are arranged side by side with each other and respectively surround a section of the injection molded body (13), in which one of the ignition devices (12) is correspondingly arranged; and / or

The bottom (18) has two through holes, each through hole is passed through by the lead wire (14) of one of the igniters, and the through hole is filled with the injection molded body (13); and/or

The injection molded body (13) includes: a first cylindrical section received in the first cylindrical portion (16) and integrally connected with the bottom (18) and/or the first cylindrical portion (16) , Two second columnar sections respectively received in one of the through holes and two second cylindrical sections respectively received in one of the second cylindrical portions (17) and connected to the bottom (18) and/or corresponding second The cylindrical part (17) is integrally connected with the third columnar section.
The ignition device module for a gas generator according to any one of claims 1 to 5, wherein the skeleton element (11) is made of metal; and/or

The injection molded body has a wire harness cavity (20), and the end of the lead wire (14) of the igniter (12) extends into the wire harness cavity (20).
A gas generator, the gas generator comprises a shell, the shell has an exhaust port (6), characterized in that the shell has a cylindrical protrusion (21) protruding inward, the The gas generator includes the igniter module for a gas generator according to any one of claims 1 to 6, the igniter module receiving the cylindrical protrusion (21) with its annular groove (19) .
The gas generator according to claim 7, wherein the igniter module is press-fitted on the cylindrical protrusion (21); and/or

The housing includes a first housing part (1) and a second housing part (2); and/or

The first housing part (1) is configured as a cup-shaped part, and the second housing part (2) is configured as a cover-shaped part; and/or

The first housing member (1) has the cylindrical protrusion (21), and the second housing member (2) has the exhaust port (6).
The gas generator according to claim 7 or 8, wherein:

The ignition device module is the ignition device module for a gas generator according to any one of claims 3 to 6; and

The gas generator includes an ignition cartridge for receiving ignition powder, the ignition cartridge is press-fitted on the second cylindrical portion (17), and is directly connected by the second housing part (2) Compressed ground or indirectly.
An airbag for a motor vehicle, the airbag comprising an air bag that can be inflated, characterized in that the airbag comprises the gas generator according to any one of claims 7 to 9, and The air bag can communicate with the exhaust port (6) of the gas generator.