Gas generator for airbag, airbag, and vehicle

Abstract

A vehicle, comprising an airbag. The airbag (100) comprises a gas generator (1) for the airbag (100); the gas generator (1) for the airbag (100) comprises a housing (10) and an ignition assembly (20); the ignition assembly (20) comprises a base (21) and a cartridge (22); the base (21) is located in the housing (10); a first snap-fit slot (23) is defined between the base (21) and the inner wall of the housing (10); the cartridge (22) is provided with a flange (24); and the flange (24) is snap-fitted to the first snap-fit slot (23), so as to limit the axial movement of the cartridge (22) along the housing (10).

Description

Gas generators for airbags, airbags and vehicles

[0001] Cross-references to related applications

[0002] This disclosure claims priority to Chinese patent application No. 202420889868.0, filed on April 25, 2024, with the China National Intellectual Property Administration and entitled “Gas Generator for Airbag, Airbag and Vehicle”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of vehicle technology, and in particular to a gas generator for an airbag, an airbag, and a vehicle. Background Technology

[0004] In related technologies, after the medicine box is inserted into the shell, a groove is usually formed by a narrowing process to fix the medicine box and the shell. The medicine box and the shell need to be pressed accurately into the preset position. However, during the narrowing process, the shell and the medicine box will deform at the same time, which can easily damage the medicine box and the shell.

[0005] Public content

[0006] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a gas generator for an airbag, which can fix the medicine box in place, preventing the medicine box from moving along the axial direction of the housing when the gas generator is working. Moreover, this snap-fit ​​method has a simple structure, is easy to install and set up, and will not damage the medicine box and the housing.

[0007] This application further proposes an airbag.

[0008] This application also proposes a vehicle.

[0009] According to this application, a gas generator for an airbag includes: a housing; and an ignition assembly, the ignition assembly including: a base and a cartridge, the base being located within the housing, a first groove being defined between the base and the inner wall of the housing, the cartridge being provided with a flange that engages with the first groove to restrict axial movement of the cartridge along the housing.

[0010] According to the gas generator for airbags of this application, by providing a flange on the medicine box and snapping the flange into a first slot defined by the inner wall of the base and the housing, the medicine box can be fixed in place, preventing the medicine box from moving along the axial direction of the housing when the gas generator is working. Moreover, this snapping method has a simple structure, is easy to install and set up, and will not damage the medicine box and the housing.

[0011] In some examples of this application, the inner wall of the housing is provided with a first protrusion protruding toward the base, and the first protrusion and the base define the first slot.

[0012] In some examples of this application, the base is provided with a second protrusion protruding toward the inner wall of the housing, and the first protrusion and the second protrusion are spaced apart in the axial direction of the housing to define the first slot.

[0013] In some examples of this application, the medicine box includes: a main body, and the flange is connected to the outer periphery of the main body.

[0014] In some examples of this application, the medicine box further includes a guide portion connected to the end of the main body away from the flange, wherein the cross-sectional area of ​​the guide portion gradually decreases in the direction away from the flange.

[0015] In some examples of this application, the medicine box further includes: a connecting portion connected to the end face of the guide portion away from the main body portion, and the connecting portion is provided with a first weakening portion; or the ignition assembly further includes: a medicine cartridge, an opening is formed at the end of the guide portion away from the main body portion, the medicine cartridge is engaged at the opening, and the medicine cartridge is provided with a second weakening portion.

[0016] In some examples of this application, the medicine container includes: a medicine container body, which is engaged with the opening; and a cover, which covers the medicine container body, and both the medicine container body and the cover are provided with the second weakening portion.

[0017] In some examples of this application, the first weakening part is constructed as a weakening groove structure, and the second weakening part is constructed as a weakening groove structure.

[0018] In some examples of this application, the ignition assembly further includes: an ignition element that is snapped into the base; and a cover that covers the ignition element on the side adjacent to the medicine box and is connected to the base.

[0019] In some examples of this application, at least a portion of the cover is clearance-fitted with the ignition element.

[0020] In some examples of this application, the inner wall of the base is provided with a second slot, and the ignition element is provided with a protrusion. The protrusion is engaged in the second slot to restrict the ignition element from moving axially along the housing.

[0021] In some examples of this application, the ignition assembly further includes a buffer disposed between the cartridge and the cover.

[0022] In some examples of this application, the gas generator for an airbag further includes: a bursting assembly, wherein a gas storage cavity is formed within the housing, and the ignition assembly and the bursting assembly are respectively located at opposite axial ends of the gas storage cavity.

[0023] In some examples of this application, the blasting assembly includes: a diffuser disposed at one end of the housing away from the ignition assembly; and a blasting element disposed on the diffuser, the blasting element being adapted to seal the gas storage cavity.

[0024] In some examples of this application, the diffuser is provided with a mounting groove on the side facing the gas storage cavity, and the rupture element is disposed in the mounting groove.

[0025] In some examples of this application, the rupture element is constructed as a sheet-like structure.

[0026] In some examples of this application, the gas generator for an airbag further includes a seal, wherein the housing has an inflation port, and the seal is sealed at the inflation port.

[0027] The airbag according to this application includes: an airbag body; and a gas generator for the airbag as described above, the gas generator being connected to the airbag body.

[0028] In some examples of this application, the airbag body is provided with an air inlet, and the gas generator includes a diffuser connected to the air inlet.

[0029] The vehicle according to this application includes: the airbags described above.

[0030] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0031] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0032] Figure 1 is a schematic diagram of a first structure of a gas generator according to an embodiment of this application;

[0033] Figure 2 is an enlarged view of point A in Figure 1;

[0034] Figure 3 is a schematic diagram of a second structure of a gas generator according to an embodiment of this application;

[0035] Figure 4 is an enlarged view of point B in Figure 3;

[0036] Figure 5 is a partial structural schematic diagram of a gas generator according to an embodiment of this application;

[0037] Figure 6 is a structural schematic diagram of the base;

[0038] Figure 7 is a schematic diagram of the ignition component;

[0039] Figure 8 is a schematic diagram of the medicine box;

[0040] Figure 9 is a schematic diagram of the medicine storage compartment;

[0041] Figure 10 is a cross-sectional view of the medicine storage compartment;

[0042] Figure 11 is a schematic diagram of a third structure of a gas generator according to an embodiment of this application;

[0043] Figure 12 is an enlarged view of point C in Figure 11;

[0044] Figure 13 is a schematic block diagram of an airbag according to an embodiment of this application;

[0045] Figure 14 is a schematic block diagram of a vehicle according to an embodiment of this application.

[0046] Reference numerals: 200, vehicle; 100, airbag; 2, airbag body; 1, gas generator; 10, shell; 11, first protrusion; 12, air storage chamber; 13, inflation port; 20, ignition assembly; 21, base; 211, second slot; 22, medicine box; 221, main body; 222, guide; 2221, opening; 223, connecting part; 2231, first weakening part; 23, first slot; 24, flange; 25, second protrusion; 26, medicine compartment; 261, second weakening part; 262, medicine compartment body; 263, cover; 27, ignition element; 271, locking protrusion; 28, cover; 29, buffer; 30, bursting assembly; 31, diffuser; 32, bursting element; 33, mounting groove; 40, sealing element; 201, air inlet. Detailed Implementation

[0047] The embodiments of this application are described in detail below, and the embodiments described with reference to the accompanying drawings are exemplary.

[0048] The following description, with reference to Figures 1-10, describes a gas generator 1 for an airbag according to an embodiment of this application. The gas generator 1 for an airbag can be installed in a vehicle and is used to inflate the airbag with gas in the event of a collision, thereby protecting the occupants of the vehicle.

[0049] As shown in Figures 1 and 3, the gas generator 1 for an airbag according to an embodiment of this application includes a housing 10 and an ignition assembly 20. The housing 10 primarily serves as a mounting point, providing installation positions for relevant components. Furthermore, the housing 10 forms the external structure of the gas generator 1, protecting the internal components and preventing interference with the external environment. The ignition assembly 20 primarily functions to ignite and detonate the gas.

[0050] As shown in Figures 2 and 4, the ignition assembly 20 includes a base 21 and a cartridge 22. The base 21 can be disposed at one axial end of the housing 10 and is located inside the housing 10. A first slot 23 is defined between the base 21 and the inner wall of the housing 10. The cartridge 22 is provided with a flange 24, which engages with the first slot 23 to restrict the movement of the cartridge 22 along the axial direction of the housing 10. The base 21 mainly serves for mounting and support, while the cartridge 22 mainly serves for storing ammunition.

[0051] The base 21 is positioned at one axial end of the housing 10, which secures the base 21, making its installation more robust and stable, and allowing it to function better. Furthermore, the axial placement of the base 21 at one end of the housing 10 facilitates its installation and setup. Specifically, the base 21 is located inside the housing 10, which protects it and reduces interference from the external environment.

[0052] The flange 24 is snapped into the first slot 23. Since the first slot 23 is formed by the base 21 and the inner wall of the housing 10, the part of the medicine box 22 with the flange 24 can be fixed between the base 21 and the housing 10, so that the medicine box 22 can be set more securely and stably, and the medicine box 22 can be prevented from moving along the axial direction of the housing 10.

[0053] Therefore, by providing a flange 24 on the medicine box 22 and snapping the flange 24 into the first slot 23 defined by the base 21 and the inner wall of the housing 10, the medicine box 22 can be fixed, preventing the medicine box 22 from moving along the axial direction of the housing 10 when the gas generator 1 is working. Moreover, this snapping method has a simple structure, is easy to install and set, and will not damage the medicine box 22 and the housing 10.

[0054] Furthermore, as shown in Figures 2 and 4, the inner wall of the housing 10 is provided with a first protrusion 11 protruding toward the base 21, and a first slot 23 is defined between the first protrusion 11 and the base 21. That is, a first protrusion 11 protruding toward the base 21 can be provided on the inner wall of the housing 10, and then a first slot 23 can be formed between the first protrusion 11 and the base 21. For example, a groove can be formed on the first protrusion 11, and this groove and the base 21 define the first slot 23, thus securing the medicine box 22. The first protrusion 11 and the base 21 can also form the first slot 23 in other ways.

[0055] Alternatively, as shown in Figures 2 and 4, the base 21 is provided with a second protrusion 25 protruding towards the inner wall of the housing 10. The second protrusion 25 can be connected to the housing 10. In the axial direction of the housing 10, the first protrusion 11 and the second protrusion 25 are arranged opposite to each other (as can be seen from Figures 2 and 4, the first protrusion 11 and the second protrusion 25 are spaced apart), and a first slot 23 is defined between the first protrusion 11 and the second protrusion 25. Both the first protrusion 11 and the second protrusion 25 can define a space. Since the second protrusion 25 is located on the side of the base 21 facing the inner wall of the housing 10, connecting the second protrusion 25 to the housing 10 can fix the second protrusion 25, thereby making the connection between the base 21 and the housing 10 more stable and reliable.

[0056] In the axial direction of the housing 10, the first protrusion 11 and the second protrusion 25 are spaced apart. It should be noted that when installing the base 21, the base 21 is installed into the interior of the housing 10 along the axial direction of the housing 10. After the base 21 is installed, because the first protrusion 11 and the second protrusion 25 are spaced apart in the axial direction of the housing 10, a space is formed between the first protrusion 11 and the second protrusion 25; this space is the first slot 23.

[0057] Additionally, as shown in Figures 2 and 4, the medicine box 22 includes a main body 221, with a flange 24 connected to the outer periphery of the main body 221. This facilitates the engagement of the flange 24 with the first slot 23. The main body 221 can be positioned opposite to the first protrusion 11. The main body 221 is the main component of the medicine box 22, primarily used to protect the interior of the medicine box 22. It should be noted that since the medicine box 22 is positioned between the base 21 and the housing 10, and the base 21 is inside the housing 10, connecting the flange 24 to one end of the main body 221 is a more reasonable and convenient arrangement for assembly. The opposing arrangement of the main body 221 and the first protrusion 11 increases the contact area between them, thereby increasing the friction between them. This can, to some extent, limit the movement of the medicine box 22, further enhancing its stability.

[0058] It should be noted that during the operation of the gas generator 1, the pressure inside the medicine box 22 increases due to the ignition of the heating agent inside the medicine box 22, and the medicine box 22 begins to expand rapidly. At this time, a large frictional force is generated between the main body 221 and the first protrusion 11. Combined with the locking and limiting between the flange 24 and the first slot 23, the medicine box 22 will not move along the axial direction of the shell 10 during the ignition of the gas generator 1.

[0059] Furthermore, as shown in Figures 2 and 4, the medicine box 22 also includes a guide portion 222, which is connected to the end of the main body 221 away from the flange 24. The cross-sectional area of ​​the guide portion 222 gradually decreases in the direction away from the flange 24. The guide portion 222 primarily serves a guiding function. It should be noted that after the heating agent in the medicine box 22 is ignited, the explosion effect at the end face of the medicine box 22 creates a directional shock wave traveling axially inside the shell 10. Under the action of the shock wave, the rupture element 32 at the diffuser 31 end will be rapidly opened, thereby enabling inflation of the airbag.

[0060] Specifically, the cross-sectional area of ​​the guide section 222 gradually decreases in the direction away from the flange 24. That is, the hot gas flow generated by the heating agent is accelerated as it flows through the guide section 222, and thus directed to a location in the housing 10 away from the flange 24. Because the heating gas flow and the compressed gas are thoroughly mixed, the heating uniformity and heating efficiency of the compressed gas are significantly improved.

[0061] Specifically, as shown in Figures 2 and 4, the medicine box 22 further includes a connecting portion 223, which is connected to the end face of the guide portion 222 away from the main body 221. A first weakening portion 2231 is provided on the connecting portion 223. Alternatively, the ignition assembly 20 includes a medicine container 26. An opening 2221 is formed at the end of the guide portion 222 away from the main body 221, and the medicine container 26 is engaged at the opening 2221. A second weakening portion 261 is provided on the medicine container 26. The connecting portion 223 primarily serves a sealing function. By connecting the connecting portion 223 to the end of the guide portion 222 away from the main body 221, the end of the guide portion 222 away from the main body 221 can be sealed, thereby preventing leakage of the heating agent inside the medicine box 22 and improving safety.

[0062] The first weakening part 2231 mainly serves to reduce the structural strength. By placing the first weakening part 2231 on the connecting part 223, the structural strength of the connecting part 223 is reduced, making it relatively more susceptible to damage. It should be noted that after the heating agent inside the medicine box 22 is ignited, the explosion effect at the end face of the medicine box 22 creates a directional shock wave traveling axially within the shell 10, specifically flowing towards the side of the guide part 222 away from the main body 221. To generate this shock wave, the heating agent needs to explode at the end face of the medicine box 22, i.e., the connecting part 223, after ignition. Therefore, placing the first weakening part 2231 on the connecting part 223 is more reasonable. This achieves both sealing of the medicine box 22 and facilitates the explosion at the end face of the medicine box 22 after ignition, thereby generating a directional shock wave.

[0063] As an optional embodiment, an opening 2221 is provided at the end of the guide portion 222 away from the main body portion 221. The opening 2221 mainly serves as a connection. The medicine chamber 26 mainly serves to store the heating medicine. The medicine chamber 26 is secured at the opening 2221, making its installation more robust and stable. The second weakening portion 261 also mainly serves to reduce structural strength. By placing the second weakening portion 261 on the medicine chamber 26, the structural strength of the medicine chamber 26 is reduced, allowing the heated medicine to break through the medicine chamber 26 after detonation and force the gas inside the casing 10 into the safety airbag. It should be noted that providing an opening 2221 at one end of the guide portion 222 and adding an independent medicine chamber 26 avoids direct weighing and filling of the heating medicine on the production line of the gas generator 1, thereby reducing the requirements for the workshop safety level.

[0064] Furthermore, as shown in Figures 4 and 10, the medicine container 26 includes a main body 262 and a cover 263. The main body 262 is engaged at the opening 2221, and the cover 263 is placed over the main body 262. Both the main body 262 and the cover 263 are provided with a second weakening part 261. The main body 262 is the main part of the medicine container 26 and is mainly used for storing heated medicine, while the cover 263 mainly serves as a seal. Engaging the main body 262 at the opening 2221 secures it, making it more stable and facilitating the storage of heated medicine. Placing the cover 263 over the main body 262 seals it, thus sealing the heated medicine inside and improving safety.

[0065] Both the main body 262 and the cover 263 of the explosive charge compartment are provided with a second damping part 261. It should be noted that the cover 263 is positioned on the side of the main body 262 closest to the base 21. When detonating the heated explosive inside the main body 262, it needs to pass through the cover 263. Therefore, the second damping part 261 is provided on the cover 263 to make it more susceptible to damage and breakage, thus facilitating the detonation of the heated explosive. After the heated explosive inside the main body 262 is detonated, it generates a large shock wave. This shock wave causes the main body 262 to expand. Therefore, the second damping part 261 is provided on the main body 262 to allow the shock wave generated inside the main body 262 to break through the main body 262 at the second damping part 261, thereby compressing the gas inside the casing 10 into the airbag.

[0066] Specifically, as shown in Figures 8-10, the first weakening part 2231 and the second weakening part 261 are both constructed as weakening groove structures. That is, both the first weakening part 2231 and the second weakening part 261 are groove structures. These groove structures can correspondingly weaken the structural strength of the connecting part 223, the main body 262 of the explosive cartridge, and the cover 263, making them relatively easier to damage, thus facilitating the detonation of the heated explosive and the directional impact of the shock wave. Furthermore, the groove structure is simple and easy to manufacture and install. Of course, the thickness of the corresponding components can also be reduced in the first weakening part 2231 and the second weakening part 261.

[0067] Additionally, as shown in Figures 1-4, the ignition assembly 20 also includes an ignition element 27 and a cover 28. The ignition element 27 is secured within the base 21, and the cover 28 covers the side of the ignition element 27 adjacent to the medicine box 22, with the cover 28 connected to the base 21. The cover 28 is adapted to be connected to the outer wall of the base 21. The ignition element 27 primarily functions to ignite and detonate, while the cover 28 primarily serves a protective function. Securely fastening the ignition element 27 within the base 21 ensures a more secure and stable installation, allowing for better ignition. Connecting the cover 28 to the outer wall of the base 21 further secures the cover 27, ensuring a more stable connection between the cover 28 and the outer wall of the base 21, thus providing better protection for the ignition element 27.

[0068] Specifically, at least a portion of the housing 28 is clearance-fitted with the ignition element 27, meaning there is a gap between at least a portion of the housing 28 and the ignition element 27, as shown in Figure 5. The housing 28 includes a fixed side wall and a bottom wall, wherein the side wall is welded to the outer wall of the base 21, and the bottom wall is clearance-fitted with the ignition element 27, meaning the bottom wall and the ignition element 27 are spaced apart along the axial direction of the housing 10. Thus, after the housing 10 is filled with gas, the high pressure causes the housing 28 to deform and bulge towards the ignition element 27. This gap protects the ignition element 27 from being squeezed by the housing 28.

[0069] It should be noted that the base 21 has a cylindrical structure. Since the ignition element 27 is located inside the base 21, this can improve the lateral strength of the ignition element 27, making it easier for the ignition element 27 to generate an axial shock wave after the heated explosive is detonated, thus avoiding disorderly cracking of the cover 28 due to the excessive ignition capability of the ignition element 27.

[0070] Specifically, in the axial direction of the housing 10, at least a portion of the cover 28 is located on the side of the ignition element 27 adjacent to the powder box 22. This allows the cover 28 to protect the side of the ignition element 27 adjacent to the powder box 22, thereby enabling the ignition element 27 to better ignite and detonate the heated powder. Moreover, since the cover 28 is connected to the outer wall of the base 21, this also allows the cover 28 to better fit the shape of the base 21, facilitating the connection between the cover 28 and the base 21.

[0071] Furthermore, as shown in Figures 5 and 6, a second slot 211 is provided on the inner wall of the base 21, and a protrusion 271 is provided on the ignition element 27. The protrusion 271 is engaged within the second slot 211 to restrict the ignition element 27 from moving axially along the housing 10. Both the second slot 211 and the protrusion 271 serve a locking function. By setting the second slot 211 on the inner wall of the base 21 and the protrusion 271 on the ignition element 27, when the ignition element 27 is assembled with the base 21, the protrusion 271 can engage with the second slot 211, thereby making the connection between the ignition element 27 and the base 21 more stable, preventing the ignition element 27 from moving axially along the housing 10, and thus allowing the ignition element 27 to perform ignition work better.

[0072] Furthermore, as shown in Figures 11 and 12, the ignition assembly 20 also includes a buffer 29, which is disposed between the powder cartridge 22 and the housing 28. The buffer 29 mainly serves a buffering and protective function. By placing the buffer 29 between the powder cartridge 22 and the housing 28, the buffer 29 can absorb and buffer the vibration caused by the detonation of the heated powder after it is ignited and detonated, thereby reducing the vibration of the gas generator 1 and consequently reducing abnormal noise.

[0073] Additionally, as shown in Figures 1 and 3, the gas generator 1 for the airbag also includes a bursting assembly 30. A gas storage chamber 12 is formed within the housing 10, with the ignition assembly 20 and bursting assembly 30 located at opposite axial ends of the gas storage chamber 12. The gas storage chamber 12 primarily stores gas, such as inert gases like argon and helium. The bursting assembly 30 primarily functions to burst. By positioning the ignition assembly 20 and bursting assembly 30 at opposite axial ends of the gas storage chamber 12, after ignition, the bursting effect at the end face of the cartridge 22 generates a large shock wave. This shock wave, under its directional impact, can break through the bursting assembly 30, allowing the gas inside the housing 10 to enter the airbag.

[0074] Further, as shown in Figures 1 and 3, the blasting assembly 30 includes a diffuser 31 and a blasting element 32. The diffuser 31 is disposed at the end of the housing 10 away from the ignition assembly 20, and the blasting element 32 is disposed on the diffuser 31, suitable for sealing the gas storage chamber 12. The diffuser 31 mainly guides gas flow, while the blasting element 32, disposed on the diffuser 31, mainly seals the gas storage chamber 12 and performs the blasting function. Distributing the diffuser 31 at the end of the housing 10 away from the ignition element 27 is more reasonable because the gas flow direction in the gas storage chamber 12 is from the end closer to the ignition element 27 towards the end of the diffuser 31. Thus, after the ignition element 27 detonates the heating charge, the shock wave generated by the heating charge can force the gas in the gas storage chamber 12 through the diffuser 31 into the interior of the airbag.

[0075] It should be noted that, because the explosion effect at the end face of the explosive container 22 after the heated explosive is ignited will generate a strong axial shock wave, even under conditions with a relatively small charge, the shock wave can still ensure that the explosive component 32 is broken open. The reduction in the charge in the gas generator 1 helps to lower costs and reduce the amount of solid residue emitted.

[0076] Specifically, as shown in Figures 1 and 3, a mounting groove 33 is provided on the side of the diffuser 31 facing the gas storage cavity 12, and the bursting element 32 is disposed in the mounting groove 33. The mounting groove 33 primarily serves an installation function. The mounting groove 33 is located on the side of the diffuser 31 facing the gas storage cavity 12, and the bursting element 32 is disposed inside the mounting groove 33. This ensures a more stable connection between the bursting element 32 and the diffuser 31, thereby allowing the bursting element 32 to better perform its sealing function.

[0077] Furthermore, as shown in Figures 1 and 3, the rupture element 32 is constructed as a sheet-like structure. Since the gas in the gas storage chamber 12 needs to break through the rupture element 32 before it can enter the interior of the airbag through the diffuser 31, the rupture element 32 is designed as a sheet-like structure. This relatively weakens the structural strength of the rupture element 32, thereby facilitating the gas in the gas storage chamber 12 to break through the rupture element 32 and then enter the interior of the airbag through the diffuser 31.

[0078] Furthermore, as shown in Figures 1 and 3, the gas generator 1 for the airbag also includes a sealing element 40, and an inflation port 13 is provided on the housing 10. The sealing element 40 seals the inflation port 13. The sealing element 40 primarily serves a sealing function, while the inflation port 13 primarily serves an inflation function. Specifically, inert gas can be injected into the air storage chamber 12 through the inflation port 13. After inflation is complete, the sealing element 40 can seal the inflation port 13 to prevent gas leakage from the air storage chamber 12, thus ensuring that sufficient inert gas is injected into the airbag during a vehicle collision. It should be noted that a through hole is provided on the connecting part 223, allowing communication between the inside of the medicine box 22 and the inside of the air storage chamber 12. This ensures that when high-pressure gas is injected into the air storage chamber 12, the pressure inside the medicine box 22 remains balanced with the pressure inside the air storage chamber 12, preventing compression of the medicine box 22 and protecting it. Similarly, if a medicine compartment 26 is provided, a through hole can be provided on the medicine compartment 26 so that the inside of the medicine compartment 26 is connected to the gas storage chamber 12.

[0079] The airbag 100 according to an embodiment of this application includes an airbag body 2 and a gas generator 1 for the airbag 100 as described in the above embodiments. The gas generator 1 is connected to the airbag body 2, as shown in FIG13. The airbag body 2 is mainly used to carry the inert gas injected after the gas generator 1 is detonated. By connecting the gas generator 1 to the airbag body 2, in the event of a vehicle collision, the inert gas in the gas generator 1 can enter the airbag body 2, causing the airbag body 2 to inflate and thus protecting the occupants of the vehicle.

[0080] Furthermore, the airbag body 2 is provided with an air inlet 201, and the gas generator 1 includes a diffuser 31, which is connected to the air inlet 201. The air inlet 201 primarily serves to allow air to enter, allowing the inert gas in the gas generator 1 to enter the airbag body 2. By connecting the diffuser 31 to the air inlet 201, in the event of a vehicle collision, the inert gas in the gas generator 1 can enter the airbag body 2, causing it to inflate and thus protecting the occupants. It should be noted that the air inlet 201 is connected to the air outlet of the gas generator 1.

[0081] It should be noted that the assembly process of gas generator 1 is as follows:

[0082] Step 1: Install the rupture element 32 by welding it to the end face of the diffuser 31 to seal the high-pressure mixed gas in the gas storage chamber 12 when the gas generator 1 is not ignited. The rupture element 32 can be made of a nickel-chromium alloy sheet.

[0083] Step 2: Install the diffuser 31 and weld the diffuser 31 to one end of the housing 10, ensuring the strength and sealing of the weld.

[0084] Step 3: Assemble the medicine box 22 by inserting the medicine box 22 into the other end of the housing 10 and engaging the flange 24 on the medicine box 22 into the first slot 23.

[0085] Step 4: Weigh and pack the heating medicine. Pack a certain weight of heating medicine into the medicine box 22.

[0086] Step 5: Assemble the ignition component 27 by pressing the ignition component 27 into the base 21, and then use a tooling to reduce the opening.

[0087] Step 6: Install the cover 28 and weld the cover 28 onto the base 21 of the installed ignition element 27.

[0088] Step 7: Assemble the ignition assembly 20. Press the ignition assembly 20, after welding the cover 28, into the housing 10. Then, perform laser welding at the connection between the base 21 and the housing 10 to achieve a seal and fixation.

[0089] Step 8: Inflate the gas. Inflate the gas storage chamber 12 with a high-pressure mixture of argon and helium through the inflation port 13, and then weld and seal the inflation port 13.

[0090] The vehicle 200 according to an embodiment of this application includes the airbag 100 of the above embodiments, as shown in FIG14.

[0091] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0092] In the description of this application, "first feature" and "second feature" may include one or more of the features. In the description of this application, "multiple" means two or more. In the description of this application, "above" or "below" the second feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. In the description of this application, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature.

[0093] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0094] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A gas generator (1) for an airbag, characterized in that, include: Shell (10); and Ignition assembly (20), the ignition assembly (20) comprising: A base (21) is located inside the housing (10), and a first slot (23) is defined between the base (21) and the inner wall of the housing (10); and The medicine box (22) is provided with a flange (24), which is engaged with the first slot (23) to restrict the axial movement of the medicine box (22) along the housing (10).

2. The gas generator (1) for an airbag according to claim 1, characterized in that, The inner wall of the housing (10) is provided with a first protrusion (11) protruding toward the base (21), and the first protrusion (11) and the base (21) define the first slot (23).

3. The gas generator (1) for an airbag according to claim 2, characterized in that, The base (21) is provided with a second protrusion (25) protruding toward the inner wall of the housing (10). In the axial direction of the housing (10), the first protrusion (11) and the second protrusion (25) are spaced apart to define the first slot (23).

4. The gas generator (1) for an airbag according to any one of claims 1-3, characterized in that, The medicine box (22) includes a main body (221), and the flange (24) is connected to the outer periphery of the main body (221).

5. The gas generator (1) for an airbag according to claim 4, characterized in that, The medicine box (22) also includes a guide portion (222), which is connected to the end of the main body (221) away from the flange (24). In the direction away from the flange (24), the cross-sectional area of ​​the guide portion (222) gradually decreases.

6. The gas generator (1) for an airbag according to claim 5, characterized in that, The medicine box (22) further includes a connecting part (223), which is connected to the end face of the guide part (222) away from the main body part (221), and a first weakening part (2231) is provided on the connecting part (223); or The ignition assembly (20) also includes a cartridge (26), and an opening (2221) is formed at one end of the guide portion (222) away from the main body portion (221). The cartridge (26) is engaged at the opening (2221), and the cartridge (26) is provided with a second weakening portion (261).

7. The gas generator (1) for an airbag according to claim 6, characterized in that, The medicine storage compartment (26) includes: The main body of the medicine container (262) is engaged at the opening (2221); and A cover (263) is provided on the main body of the medicine container (262), and both the main body of the medicine container (262) and the cover (263) are provided with the second weakening part (261).

8. The gas generator (1) for an airbag according to claim 6 or 7, characterized in that, The first weakening part (2231) is constructed as a weakening groove structure, and the second weakening part (261) is constructed as a weakening groove structure.

9. The gas generator (1) for an airbag according to any one of claims 1-8, characterized in that, The ignition assembly (20) also includes: Ignition element (27), said ignition element (27) being fitted into said base (21); and Cover (28) is placed on the side of the ignition element (27) adjacent to the medicine box (22), and the cover (28) is connected to the base (21).

10. The gas generator (1) for an airbag according to claim 9, characterized in that, At least part of the cover (28) is clearance-fitted with the ignition element (27).

11. The gas generator (1) for an airbag according to claim 9 or 10, characterized in that, The base (21) has a second slot (211) on its inner wall and a protrusion (271) on its ignition element (27). The protrusion (271) is engaged in the second slot (211) to restrict the ignition element (27) from moving axially along the housing (10).

12. The gas generator (1) for an airbag according to any one of claims 9-11, characterized in that, The ignition assembly (20) further includes a buffer (29) disposed between the medicine box (22) and the cover (28).

13. The gas generator (1) for an airbag according to any one of claims 1-12, characterized in that, Also includes: The blasting assembly (30) has a gas storage cavity (12) formed inside the housing (10), and the ignition assembly (20) and the blasting assembly (30) are located at the two axial ends of the gas storage cavity (12), respectively.

14. The gas generator (1) for an airbag according to claim 13, characterized in that, The blasting assembly (30) includes: A diffuser (31) is disposed at one end of the housing (10) away from the ignition assembly (20); and A rupture element (32) is disposed on the diffuser (31) and is adapted to block the gas storage cavity (12).

15. The gas generator (1) for an airbag according to claim 14, characterized in that, The diffuser (31) has an installation groove (33) on the side facing the gas storage cavity (12), and the rupture element (32) is disposed in the installation groove (33).

16. The gas generator (1) for an airbag according to claim 14 or 15, characterized in that, The blasting component (32) is constructed as a sheet-like structure.

17. The gas generator (1) for an airbag according to any one of claims 1-16, characterized in that, Also includes: A sealing element (40) is provided on the housing (10) with an air inlet (13), and the sealing element (40) is sealed at the air inlet (13).

18. An airbag (100), characterized in that, include: Airbag body (2); and The gas generator (1) for the airbag (100) according to any one of claims 1-17 is connected to the airbag body (2).

19. The airbag (100) according to claim 18, characterized in that, The airbag body (2) is provided with an air inlet (201), and the gas generator (1) includes a diffuser (31), which is connected to the air inlet (201).

20. A vehicle (200), characterized in that, include: The airbag (100) according to any one of claims 18-19.

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