Single-stage cylindrical gas generator

Abstract

The invention discloses a single-stage cylindrical gas generator. The single-stage cylindrical gas generator comprises a cylindrical shell, the ignition device is fixed at the upstream end of the cylindrical shell; the gas generating agent is close to the ignition device; an inner nozzle engaged with an inner wall of the cylindrical housing; the residue collecting tank I is arranged at the downstream end of the internal nozzle; the filter screen tank is positioned at one end, far away from the internal nozzle, of the residue collecting tank I; the forming end cover is fixed at one end, far away from the residue I collecting tank, of the filter screen tank; the rupture disk assembly is fixed on the outlet hole of the forming end cover; and the diffuser is located at the downstream end of the rupture disk assembly, an output hole is formed in the diffuser, and combustion products are discharged into the air bag through the output hole. According to the invention, the optimization of performance output, component weight and outline such as total length and outer diameter is realized, the characteristics and optimization enable the gas generator to be more suitable for the modern electric automobile technology, and the competitive advantage of the gas generator in the design of the existing automobile gas generator is improved.

Description

Technical Field

[0001] The present invention relates to an inflation assembly for an airbag or other safety device, particularly a single-stage gas generator for a vehicle. Background Art

[0002] Existing gas generators come in various shapes, and the latest versions adopt an annular structure. For newly designed vehicles, especially electric vehicles (EVs), there are strict restrictions on the installation space for airbag assemblies. Therefore, a cylindrical gas generator assembly with a smaller outer diameter is required.

[0003] Based on this, those skilled in the art have proposed a single-stage cylindrical gas generator, presenting a new solution to solve the above technical problems. Summary of the Invention

[0004] Based on this, it is necessary to provide a single-stage cylindrical gas generator for the problems raised in the above background art, aiming to optimize the performance output range, while meeting the structural and safety requirements, and being able to provide repeatable performance, compliant variations, and meet industry standards.

[0005] The present invention adopts the following technical solutions:

[0006] A single-stage cylindrical gas generator provided by the present invention specifically includes:

[0007] A cylindrical outer shell;

[0008] An ignition device one fixed at the upstream end of the cylindrical outer shell;

[0009] A gas-producing agent disposed in the cylindrical outer shell and adjacent to the ignition device one;

[0010] An internal nozzle through which combustion products flow, and the internal nozzle is joined to the inner wall of the cylindrical outer shell;

[0011] A residue collection tank one disposed in the cylindrical outer shell and located at the downstream end of the internal nozzle, wherein the internal nozzle is used to direct the combustion products to the residue collection tank one, and a plurality of radial holes are opened near the upstream end of the residue collection tank one, and an annular channel is formed between the outer diameter of the residue collection tank one and the inner wall of the cylindrical outer shell;

[0012] A filter tank located at one end of the residue collection tank one away from the internal nozzle, and a plurality of filter holes are opened on the outer periphery of the filter tank;

[0013] A forming end cap, the forming end cap is fixed at one end of the filter tank away from the residue collection tank one, and an outlet hole is opened at one end of the forming end cap away from the filter tank;

[0014] A rupture disc assembly, fixed to the outlet hole of the formed end cap;

[0015] A diffuser, located at the downstream end of the rupture disc assembly, with an output hole formed thereon, and combustion products are discharged into the airbag through the output hole.

[0016] Preferably, a spring is provided between the internal nozzle and the gas generating agent.

[0017] Preferably, one end of the spring is helically closed, and its helically closed end is close to the gas generating agent.

[0018] Preferably, it further includes a plurality of residue collection areas, which include Area 1 at the downstream end inside the first residue collection tank, Area 2 at the upstream end of the first residue collection tank, Area 3 at the interface between the cylindrical outer shell and the formed end cap, Area 4 at the interface between the filter tank and the first residue collection tank, and Area 5 at the downstream end outside the filter tank and inside the formed end cap.

[0019] Preferably, the filter tank is fixed to the outside of the downstream end of the first residue collection tank by an interference fit.

[0020] Preferably, the filter holes on the filter tank are arranged in a staggered or offset manner.

[0021] Preferably, the rupture disc assembly includes a rupture disc body, which is configured to rupture under the action of combustion products after the first ignition device is activated.

[0022] Preferably, the diffuser includes a diffusion screen provided on its inner side, and a plurality of screen holes for discharging combustion products into the airbag are formed on the outer periphery of the diffusion screen.

[0023] Preferably, the outer diameter of the cylindrical outer shell is not greater than 40 millimeters.

[0024] A single-stage cylindrical gas generator, comprising:

[0025] A cylindrical outer shell;

[0026] A first ignition device fixed to the upstream end of the cylindrical outer shell;

[0027] A gas generating agent disposed in the cylindrical outer shell and adjacent to the first ignition device;

[0028] An internal component, the internal component includes a tortuous path of combustion products and a residue collection area, and the internal component includes an outlet hole;

[0029] A rupture disc assembly fixed to the outlet hole;

[0030] A diffuser disposed at the downstream end of the rupture disc assembly, the diffuser including an output hole through which combustion products are discharged into the airbag.

[0031] Preferably, the tortuous path includes at least four turns between the gas generant and the outlet hole.

[0032] Preferably, the tortuous path includes six turns between the gas generant and the outlet hole.

[0033] Preferably, the internal component includes at least two of the residue collection areas.

[0034] Preferably, the internal component includes five of the residue collection areas.

[0035] Preferably, the outer diameter of the cylindrical housing is not greater than 40 millimeters.

[0036] Preferably, the internal component includes:

[0037] An internal nozzle joined to the inner wall of the cylindrical housing;

[0038] A first residue collection can disposed within the cylindrical housing and at the downstream end of the internal nozzle, wherein the internal nozzle is used to direct combustion products to the first residue collection can, and a number of radial holes are provided near the upstream end of the first residue collection can;

[0039] A filter can located at the end of the first residue collection can away from the internal nozzle, and a plurality of filter holes are provided on the outer periphery of the filter can;

[0040] A formed end cap fixed to the end of the filter can away from the first residue collection can, the outlet hole being provided at the end of the formed end cap away from the filter can, and the rupture disc assembly being fixed to the outlet hole on the formed end cap.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] 1. A single-stage cylindrical gas generator provided by the present invention realizes the optimization of performance output, component weight, and external profiles such as total length and outer diameter. These characteristics and optimizations make it more suitable for modern electric vehicle technologies and improve its competitive advantage in existing automotive gas generator designs.

[0043] 2. The present invention adopts an ignition system with a tortuous path, reducing the level of particulate matter discharged from the gas generator while meeting its performance objectives, and having good practicability.

[0044] 3. The present invention optimizes the performance output range, meets the structural and safety requirements simultaneously, can provide repeatable performance, compliant variations, and meets industry standards, which is conducive to popularization. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the solutions in the present invention, the following will briefly introduce the drawings required for description in the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0046] Figure 1 It is a schematic cross-sectional structure diagram of the present invention;

[0047] Figure 2 It is a schematic top view structure diagram of the present invention;

[0048] Figure 3 It is a schematic structure diagram of the forming end cap of the present invention;

[0049] Figure 4 It is a schematic structure diagram of the filter screen tank of the present invention;

[0050] Figure 5 It is a schematic structure diagram of the diffuser of the present invention;

[0051] Figure 6 It is a schematic structure diagram of the residue collection area of the present invention;

[0052] Figure 7 It is a schematic structure diagram of the tortuous path of the combustion products of the present invention;

[0053] Figure 8 It shows a schematic structure diagram of a reference design including a spring and a residue collection tank 1;

[0054] Figure 9 It shows a schematic structure diagram of a double-cup design solution;

[0055] Figure 10 It shows a schematic structure diagram of a design solution of a residue collection tank 2 with a spring;

[0056] Figure 11 It shows a schematic structure diagram of a design solution with a filter, a deflector, and a spring;

[0057] Figure 12 It shows an exemplary alternative booster charge bag design, using a push tube design;

[0058] Figure 13 It shows another alternative example of an ignition device and a booster charge bag.

[0059] The notations in the figures are explained as follows:

[0060] 12. Cylindrical housing; 14. Ignition device 1; 14'. Ignition device 2; 114. Ignition device 3; 16. Cover plate; 18. Igniter body; 20. Booster charge bag; 22. Gas - generating agent; 24. Internal nozzle; 26. Residue collection tank 1; 26'. Residue collection tank 2; 28. Radial hole; 30. Annular channel; 34. Spring; 35. Deflector; 36. Filter screen tank; 37. Cup; 38. Filter screen hole; 39. Filter; 40. Formed end cap; 42. Bursting disc assembly; 44. Bursting disc body; 46. Diffusion screen; 48. Screen hole; 50. Diffuser; 54. Small oval opening; 52. Large oval opening; 56. Boosting tube; A1. Region 1; A2. Region 2; A3. Region 3; A4. Region 4; A5. Region 5; 120. Boosting assembly; 122. Tank; 1. Turn 1; 2. Turn 2; 3. Turn 3; 4. Turn 4; 5. Turn 5; 6. Turn 6. Detailed implementation manners

[0061] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0062] Figure 1 and Figure 2 Fig. shows an exemplary cylindrical single - stage gas generator 10 and its internal components. It includes a cylindrical housing 12 and an ignition device 1 fixed to the upstream end of the cylindrical housing 12. In a preferred structure, the outer diameter of the cylindrical housing 12 is 40 mm or less, and an external connector 13 can be used for fixing the gas generator.

[0063] The ignition device 1 includes a cover plate 16 or a similar component, which is installed and engaged with the inner surface of the cylindrical housing 12 by interference fit and fixes the ignition device 1 together with the igniter body 18. The structure, function, and operation of the ignition device 1 are prior art, so they will not be described in detail. Any suitable ignition device 1 can be used for the cylindrical single - stage gas generator 10 described in the present invention.

[0064] The booster charge bag 20 is located beside the cover plate 16, and the gas - generating agent 22 is located inside the cylindrical housing 12, adjacent to the ignition device 1 and the booster charge bag 20.

[0065] The inner nozzle 24 directs the combustion products towards a residue collection canister 26 located downstream of the inner nozzle 24. The inner nozzle 24 engages the inner wall of the cylindrical housing 12 and the inner nozzle 24 can be integrally formed with the residue collection canister 26. The residue collection canister 26 is provided with a plurality of radial holes 28 near its upstream end. Continuing reference Figure 1 is made to, an annular passage 30 is formed between the outer diameter of the residue collection canister 26 and the inner wall of the cylindrical housing 12.

[0066] A spring 34 can be fixed between the inner nozzle 24 and the gas generating charge 22 to fix the gas generating charge 22 in the propellant chamber. The spring 34 can be a spring with a top helical closure, and the helical closure provides a surface for blocking larger particles during the deployment of the spring 34.

[0067] A filter canister 36 is located at the downstream end of the residue collection canister 26 and is also spaced from the inner wall of the cylindrical housing 12. The filter canister 36 is fixed to the residue collection canister 26 by an interference fit. The filter canister 36 is provided with a plurality of filter holes 38. In some embodiments, the filter holes 38 are arranged in a staggered or offset hole pattern.

[0068] The formed end cap 40 is fixed to the exhaust end of the cylindrical housing 12 by friction welding. A perspective view of the formed end cap 40 is as Figure 3 shown. The formed end cap 40 serves as an interface for the filter canister 36. The rupture disc assembly 42 includes a rupture disc body 44 and a rupture disc support. The rupture disc assembly 42 is fixed to the outlet hole of the formed end cap 40 and the rupture disc body 44 is clamped by the rupture disc support and the formed end cap 40. The rupture disc body 44 can be a component with a flat and smooth surface or an alternative design with cross-shaped or grid features on the surface. For example, the rupture disc body can be a cross-shaped disc that will "petalize" when ruptured. This design reduces the chance of the rupture disc body fragments being sprayed into the airbag. In one possible embodiment, the rupture disc assembly 42 can be modified to accommodate a rupture disc body 44 with a larger diameter.

[0069] The formed end cap 40 also provides a mounting surface for the rupture disc assembly 42.

[0070] The formed end cap 40 and the filter canister 36 provide a "hard stop" for the internal components so that the internal components can be stacked and assembled together. During the filling operation of the mixed gas inside the generator assembly, the outer surface of the formed end cap 40 provides a firm support end face for the gas filling operation. After this operation is completed, the rupture disc assembly 42 is welded to the outlet hole of the formed end cap 40 for sealing. The welding of the rupture disc support and the rupture disc body provides a welding surface for welding the entire rupture disc assembly 42, which is used as an exhaust port for performance output when the gas generator assembly is activated.

[0071] The diffuser screen 46 includes a plurality of screen holes 48, which are fixed above the formed end cap 40 and the rupture disc assembly 42. The formed end cap 40 also serves as an attachment interface for the diffuser screen 46. Figure 4 A perspective view of an exemplary diffuser screen 46 is shown.

[0072] The diffuser 50 is disposed outside the diffuser screen 46 and is fixed to the end of the cylindrical housing 12 by welding or other means. The diffuser 50 includes output holes of appropriate size and shape, and the combustion products flow into the airbag through the output hole openings. Figure 5 A perspective view of an exemplary diffuser 50 is shown, and the output holes of the exemplary diffuser 50 include a large oval opening 52 and two small oval openings 54. Other configurations may vary depending on the specific application.

[0073] The ignition device 14 initiates the ignition chain by igniting the gas-generating charge 22. The location where the gas-generating charge 22 is located is set as the propellant chamber. The gas-generating charge and the inert gas mixture fill the propellant chamber. After the gas-generating charge 22 is ignited, it will ignite the propellant chamber. As the gas-generating charge burns and mixes with the stored inert gas, the internal pressure of the propellant chamber increases, and the combustion products flow through a series of media and channels. The main media and channels are the spring 34, and the secondary media and channels are the residue collection tank 26 and the filter tank 36. These media and channels also serve as collection areas for larger particles generated during the combustion process.

[0074] As described above, the spring 34 may include a top spiral closed portion. Therefore, the spring 34 not only abuts and compresses the gas-generating charge 22 but also provides a surface for blocking larger particles.

[0075] Reference Figure 6 , the combustion products flow through the internal nozzle 24, which directs the combustion products to the residue collection tank 26, and the particles can be collected in the residue collection area A1. Subsequently, the combustion products are redirected by the residue collection tank 26 and flow to the radial holes 28 on the side wall of the residue collection tank 26. The residue collection area A2 is located at the corner of the residue collection tank 26. After the combustion products make a second turn through the radial holes 28, the combustion products are then directed to the downstream end outside the residue collection tank 26, that is Figure 6On the right side of the first residue collection tank 26, the third residue collection area A3 is located at the position of the internal friction weld between the cylindrical outer shell 12 and the diffuser 50. As the combustion products continue to flow through the filter holes 38 of the filter tank 36, the residues generated by combustion are also collected in the fourth residue collection area A4 at the interference fit between the first residue collection tank 26 and the filter tank 36. The residues further accumulate at the fifth residue collection area A5 at the interference fit between the filter tank 36 and the formed end cap 40. The combustion products pass through the filter holes 38 into the filter tank 36, then pass through the formed end cap 40, and enter the diffuser 50 through the rupture disc assembly 42. The combustion products flow out through the output hole opening of the diffuser 50 after passing through the diffusion screen 46. Before the combustion products are discharged into the airbag, the larger particles and residues are blocked and collected by the diffusion screen 46.

[0076] The gas generator 10 uses a cylindrical outer shell 12 as a pressure vessel, which retains all internal components and is sealed and welded at both ends to hermetically store the inert gas mixture inside the cylindrical outer shell 12. The structural welds of the pressure vessel are laser or friction welded to form an integral generator housing. In some embodiments, a low-strength pressure vessel can be used for low-output designs, while a high-strength pressure vessel can be used for high-output designs.

[0077] The first ignition device 14 uses an igniter housing to accommodate the igniter for starting the airbag deployment process, and there are various options for the design and welding operation of the igniter housing. For example, the igniter housing assembly can be laser or friction welded to meet the structural requirements. Exemplary designs include friction welding designs, laser welding designs, all-metal housings that can be laser or friction welded, or molded connector interface housings that can also be laser or friction welded.

[0078] Figure 7Shows the tortuous path of the combustion flow after the activation of Ignition Device 14. The energy of Ignition Device 14 causes the gas-generating propellant 22 to ignite, start burning in the propellant chamber, and begin to flow through the spring 34. The internal nozzle 24 directs the combustion products towards the first residue collection canister 26. When the combustion products flow to contact the top closed or basin-shaped part of the first residue collection canister 26, the flow of the combustion products turns 180 degrees to form Turn 1 in the figure towards the radial hole 28 of the first residue collection canister 26; then the combustion products continue to flow through the radial hole 28 and turn 90 degrees to form Turn 2 in the figure, and then turn 90 degrees again to enter the annular channel 30 between the outside of the first residue collection canister 26 and the inner wall of the cylindrical housing 12 to form Turn 3 in the figure. Subsequently, the combustion products continue to flow and contact the friction-welded area of the formed end cap 40 and the cylindrical housing 12, and turn 90 degrees through the filter holes 38 of the filter canister 36 to form Turn 4 in the figure. Then the combustion products continue to flow and turn 90 degrees towards the outlet hole of the formed end cap 40 to form Turn 5 in the figure. Subsequently, it passes through the formed end cap 40, passes through the bursting disc assembly 42, and then turns 90 degrees through the diffuser screen 46 to form Turn 6 in the figure, and then is sprayed into the airbag.

[0079] Additional or alternative components can be used to fix the gas-generating propellant 22 in the propellant chamber, such as a formed cup-shaped structure with a filtering top function, etc. Figures 8 - 11 The relevant examples given Figure 8 Shows a reference design including the spring 34 and the first residue collection canister 26; Figure 9 Shows a double-cup design using the cup 37 to fix the gas-generating propellant 22; Figure 10 Shows a design of the second residue collection canister 26' with a spring; Figure 11 Shows a design integrating a filter 39, a deflector 35, and a spring 34.

[0080] To achieve the required performance output and meet safety, structural, and industry requirements, a booster retention scheme can be adopted. Figure 1 Shows a reference component including a cover plate 16 and a booster charge bag 20. In an alternative solution, a booster charge bag 20 may not be used and a booster device can be adopted, which consists of a sealed housing with a booster charge inside;

[0081] Figure 12 Shows another alternative Ignition Device 2 14', including a booster tube 56 with a booster charge installed inside the booster tube 56;

[0082] Figure 13Shows a modified form of the ignition device III 114 and the booster charge bag 20. The ignition device 114 can include an igniter body in an all-metal form or a semi-metal and semi-molded component as shown in the figure. The booster charge bag 20 can be modified into a booster assembly 120 to protect the booster charge bag. As shown in the figure, the booster assembly 120 can include a can 122 with a lid to protect the booster charge bag from being torn.

[0083] The gas generator assembly according to the present invention uses a single combustion chamber, which is formed by an ignition device, a booster charge assembly, an internal component pressed to a hard stop, and loosely filled gas-generating agent particles to form an exhaust system. The structural welds provide the robustness required for safety and sealing requirements, and the external rupture disc assembly provides sealing. The combustion products flow through the external diffuser 50 and are dispersed by the diffusion screen 46.

[0084] Although the present invention has been described in conjunction with the presently considered most practical and preferred embodiments, it should be understood that the present invention is not limited to the disclosed embodiments. On the contrary, the present invention is intended to cover various modifications and equivalent arrangements included within the scope of the appended claims.

[0085] In the present invention, unless otherwise clearly specified and defined, terms such as "installed", "connected", "connected to", "fixed" and the like shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection or communication with each other; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0086] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. The preferred embodiments of the present invention are given in the drawings, but do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosed content of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments or equivalently replace some of the technical features. Any equivalent structure directly or indirectly using the content of the specification and drawings of the present invention in other related technical fields is equally within the scope of the patent protection of the present invention.

Claims

1. A single-stage cylindrical gas generator, characterized in that, Comprising: A cylindrical outer shell (12); An ignition device one (14) fixed to the upstream end of the cylindrical outer shell (12); A gas-generating charge (22) disposed within the cylindrical outer shell (12) and adjacent to the ignition device one (14); An internal nozzle (24) through which combustion products flow, the internal nozzle (24) being joined to the inner wall of the cylindrical outer shell (12); A residue collection canister one (26) disposed within the cylindrical outer shell (12) and at the downstream end of the internal nozzle (24), wherein the internal nozzle (24) is configured to direct combustion products to the residue collection canister one (26), and a plurality of radial holes (28) are provided near the upstream end of the residue collection canister one (26), and an annular channel (30) is formed between the outer diameter of the residue collection canister one (26) and the inner wall of the cylindrical outer shell (12); A filter screen canister (36) located at the end of the residue collection canister one (26) remote from the internal nozzle (24), and a plurality of filter screen holes (38) are provided on the outer periphery of the filter screen canister (36); A formed end cap (40) fixed to the end of the filter screen canister (36) remote from the residue collection canister one (26), and an outlet hole is provided at the end of the formed end cap (40) remote from the filter screen canister (36); A rupture disk assembly (42) fixed to the outlet hole of the formed end cap (40); A diffuser (50) located at the downstream end of the rupture disk assembly (42), and an output hole is provided thereon, and combustion products are discharged into the airbag through the output hole.

2. The single-stage cylindrical gas generator according to claim 1, wherein, A spring (34) is provided between the internal nozzle (24) and the gas-generating charge (22).

3. A single-stage cylindrical gas generator according to claim 2, characterized in that, One end of the spring (34) is helically closed, and its helically closed end is close to the gas-generating charge (22).

4. A single-stage cylindrical gas generator according to claim 1, characterized in that, It further includes a plurality of residue collection areas, and the residue collection areas include area one (A1) at the inner downstream end of the residue collection canister one (26), area two (A2) at the upstream end of the residue collection canister one (26), area three (A3) at the interface between the cylindrical outer shell (12) and the formed end cap (40), area four (A4) at the interface between the filter screen canister (36) and the residue collection canister one (26), and area five (A5) at the outer downstream end of the filter screen canister (36) and inside the formed end cap (40).

5. A single-stage cylindrical gas generator according to claim 1, characterized in that, The filter screen canister (36) is fixed to the outside of the downstream end of the residue collection canister one (26) by an interference fit method.

6. A single-stage cylindrical gas generator according to claim 1, characterized in that, The filter screen holes (38) on the filter screen canister (36) are arranged in a staggered or offset manner.

7. A single-stage cylindrical gas generator according to claim 1, characterized in that, The rupture disk assembly (42) includes a rupture disk body, and the rupture disk body is configured to rupture due to the action of combustion products after the ignition device one (14) is activated.

8. A single-stage cylindrical gas generator according to claim 1, characterized in that, The diffuser (50) includes a diffusion screen (46) provided on its inner side, and a plurality of screen holes (48) for discharging combustion products into the airbag are provided on the outer periphery of the diffusion screen (46).

9. A single-stage cylindrical gas generator according to claim 1, characterized in that, The outer diameter of the cylindrical outer shell (12) is not greater than 40 millimeters.

10. A single-stage cylindrical gas generator, characterized in that, Comprising: A cylindrical outer shell (12); An ignition device one (14) fixed to the upstream end of the cylindrical housing (12); A gas-generating charge (22) disposed within the cylindrical housing (12) and adjacent to the ignition device one (14); An internal component, the internal component including a tortuous path for combustion products and a residue collection area, the internal component including an outlet hole; A rupture disc assembly (42) fixed to the outlet hole; A diffuser (50) disposed at the downstream end of the rupture disc assembly (42), the diffuser (50) including an output hole through which the combustion products are discharged into the airbag.

11. A single-stage cylindrical gas generator according to claim 10, characterized in that, The tortuous path includes at least four turns between the gas-generating charge (22) and the outlet hole.

12. A single-stage cylindrical gas generator according to claim 11, characterized in that, The tortuous path includes six turns between the gas-generating charge (22) and the outlet hole.

13. A single-stage cylindrical gas generator according to claim 10, characterized in that, The internal component includes at least two of the residue collection areas.

14. A single-stage cylindrical gas generator according to claim 13, characterized in that, The internal component includes five of the residue collection areas.

15. A single-stage cylindrical gas generator according to claim 11, characterized in that, The outer diameter of the cylindrical housing (12) is not greater than 40 millimeters.

16. A single-stage cylindrical gas generator according to claim 11, characterized in that, The internal component includes: An internal nozzle (24) joined to the inner wall of the cylindrical housing (12); A residue collection can one (26) disposed within the cylindrical housing (12) and at the downstream end of the internal nozzle (24), wherein the internal nozzle (24) is used to direct the combustion products to the residue collection can one (26), and a plurality of radial holes (28) are provided near the upstream end of the residue collection can one (26); A filter can (36) located at the end of the residue collection can one (26) away from the internal nozzle (24), and a plurality of filter holes (38) are provided on the outer periphery of the filter can (36); A formed end cap (40) fixed to the end of the filter can (36) away from the residue collection can one (26), the outlet hole is provided at the end of the formed end cap (40) away from the filter can (36), and the rupture disc assembly (42) is fixed to the outlet hole on the formed end cap (40).

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