Air bag device

Abstract

The invention discloses an air bag device which comprises a bag, a gas generator, a retaining ring and a cushion piece, the retaining ring and the cushion piece are located in the bag, a plugging part of the gas generator is plugged into the bag through a mounting opening in the bag, and a flange of the gas generator is located on the outer side of the bag; the retaining ring is provided with a first hole and is sleeved on the plugging part of the gas generator through the first hole; a second hole is formed in the cushion piece, and the cushion piece sleeves the plugging part of the gas generator and is positioned on one side, close to the bag cloth piece, of the retaining ring; the inner side edges of the second holes are all attached to the periphery of the plugging part of the gas generator, or the radial distance between the inner side edges of the second holes and the periphery of the plugging part of the gas generator is smaller than the radial distance between the inner side edges of the first holes and the periphery of the plugging part of the gas generator. The fastening piece sequentially penetrates through the retaining ring, the cushion piece, the bag cloth piece and the flange of the gas generator. The air bag panel under the retaining ring is prevented from being impacted by air, and the overall air tightness of the air bag device is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of safety airbags, and in particular to an airbag device. Background Art

[0002] The inlet end of the gas generator is typically inserted into the airbag through the airbag mounting port. Once the gas generator is ignited, it delivers high-pressure gas into the airbag. When the inlet end of the gas generator is installed in the airbag, a retaining ring is placed over it, and the airbag fabric is pressed between the retaining ring and the gas generator flange.

[0003] In existing technology, there is an assembly gap between the retaining ring and the sidewall of the inflator's intake port. During detonation, high-temperature gases or combustion residues can erupt from this gap, directly burning through the airbag fabric and causing leakage and failure. Furthermore, because the retaining ring and flange are both made of metal, they are prone to rigid deformation when pressed together, creating a gap. The diffusion of high-pressure gas through this gap increases the impact area on the fabric, potentially causing tearing or gas leakage from the bolted joints, ultimately affecting the airbag's pressure-maintaining performance.

[0004] Based on this, a new technical solution is needed. Summary of the Invention

[0005] In view of this, an embodiment of the present invention provides an airbag device to at least solve the problem of poor pressure-maintaining capability of existing airbag devices.

[0006] The embodiments of the present invention provide the following technical solutions:

[0007] An embodiment of the present invention provides an airbag device, comprising a bag, a gas generator, and a retaining ring located within the bag, wherein an insertion portion of the gas generator is inserted into the bag through an installation opening on the bag, and a flange of the gas generator is located outside the bag; the retaining ring has a first hole and is sleeved onto the insertion portion of the gas generator through the first hole;

[0008] Also includes:

[0009] a cushion member, the cushion member being provided with a second hole and being sleeved on the insertion portion of the gas generator and being located on a side of the retaining ring close to the bladder cloth sheet, wherein the inner side edges of the second hole are both in contact with the outer periphery of the insertion portion of the gas generator or the radial distance between the inner side edges of the second hole and the outer periphery of the insertion portion of the gas generator is smaller than the radial distance between the inner side edges of the first hole and the outer periphery of the insertion portion of the gas generator;

[0010] a fastener, the fastener being sequentially arranged through the retaining ring, the cushion, the bladder cloth sheet, and the flange of the gas generator;

[0011] When the gasket is fixed by the fastener, the gasket is compressed and deformed by the retaining ring and the flange of the gas generator, and fills the gap between the retaining ring and the flange of the gas generator.

[0012] Furthermore, the rigidity of the gasket is less than the rigidity of the retaining ring; and / or

[0013] The rigidity of the gasket is lower than the rigidity of the flange of the gas generator.

[0014] Furthermore, the diameter of the second hole is smaller than the diameter of the installation opening of the bladder bag.

[0015] Furthermore, the cushion member further comprises:

[0016] A plurality of protrusions are arranged along the circumference of the gasket on a side of the panel facing the mounting port, for compressing and fixing the cloth piece of the bag and / or filling the gap between the retaining ring and the gas generator flange after being compressed.

[0017] Furthermore, after the gasket is compressed, the protrusion extends toward the periphery and fills the gap between the retaining ring and the gas generator flange.

[0018] Furthermore, a side surface of the cushion facing the panel where the installation port is located is a plastic-coated surface, and the plastic-coated surface has embossing formed by dot patterns or line-shaped ribs.

[0019] Furthermore, after the gasket is compressed, the embossing or the dot pattern extends toward the periphery and fills the gap between the retaining ring and the gas generator flange.

[0020] Furthermore, the cushion is made of at least one material selected from the group consisting of plastic, rubber, and soft metal.

[0021] Furthermore, the cushion comprises:

[0022] A plurality of fixing holes are provided on the gasket along the circumference of the gasket, and the inner diameter of the fixing holes is larger than the inner diameter of the bolt holes on the retaining ring.

[0023] Furthermore, the cushion comprises:

[0024] A plurality of fixing holes are provided on the cushion along the circumference of the cushion, an inner side edge of the fixing hole is provided with an inner protrusion toward the center of the fixing hole, and the inner protrusion is provided toward the center of the fixing hole.

[0025] The present invention also provides an airbag device, comprising a bag, a gas generator, and a retaining ring located within the bag, wherein the insertion portion of the gas generator is inserted into the bag through a mounting opening on the bag, and a flange thereof is located outside the bag; the retaining ring has a first hole and is sleeved onto the insertion portion of the gas generator through the first hole;

[0026] A convex point is provided on a side of the retaining ring facing the upper flange of the gas generator. When the retaining ring is fastened to the flange by a fastener, the convex point is pressed and extends toward the surrounding area.

[0027] Compared with the prior art, the at least one technical solution adopted in the embodiment of the present invention can achieve the following beneficial effects:

[0028] An airbag device of the present invention adds a gasket between the bag and the retaining ring. The gasket is sleeved on the plug-in part of the gas generator through a second hole. The inner side edge of the second hole is close to or close to the outer periphery of the plug-in part of the gas generator, thereby preventing the gas released by the gas generator from flowing out from the gap between the retaining ring and the gas generator. The gasket can also fill the gap between the gas generator flange and the retaining ring to prevent the gas from impacting the bag panel under the retaining ring and flowing out from the bolts, thereby increasing the overall airtightness of the airbag device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0030] Figure 1 A partial cross-sectional view of an airbag device according to an embodiment of the present invention;

[0031] Figure 2 Schematic diagram of the structure of a cushion member according to an embodiment of the present invention (I);

[0032] Figure 3 Schematic diagram of the structure of the cushion member according to an embodiment of the present invention (II);

[0033] Figure 4 This is a structural schematic diagram of a cushion member according to an embodiment of the present invention (III).

[0034] The accompanying drawings of the present invention are marked as follows: 1. bladder; 2. gas generator; 21. flange; 3. retaining ring; 4. gasket; 5. second hole; 6. fastener; 7. convex portion; 8. fixing hole; 81. inner protrusion. DETAILED DESCRIPTION

[0035] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0036] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the features in the following embodiments and embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of this application.

[0037] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on this application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspect described herein can be used to implement an apparatus and / or practice a method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this apparatus and / or practice this method.

[0038] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The illustrations only show components related to the present application and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0039] Additionally, in the following description, specific details are provided to provide a thorough understanding of the examples, however, one skilled in the art will appreciate that the examples can be practiced without these specific details.

[0040] In existing airbags, the pancake-shaped gas generator fixes the airbag through an airbag retaining ring. Under some extreme detonation conditions, the installation port of the airbag will be torn after being impacted by high-pressure gas or high-temperature residue, causing the airbag at the installation port to fly away.

[0041] For example, after the airbag module is assembled, there is a gap between the side wall of the gas generator insertion part and the inner edge of the retaining ring, which is generally 2-5 mm. After the gas generator is ignited, the gas may rush directly to the gas generator installation port of the airbag through this gap, causing the airbag installation port to burn through or burn.

[0042] In view of this, the inventors conducted in-depth research and improvement exploration on the retaining ring 3, the flange 21 of the gas generator, and the distance between the gas generator 2 and the retaining ring 3, and the side wall of the installation port, and found that: by adding a gasket 4 with a small opening to the bottom surface of the retaining ring 3, the gasket 4 plays a role in blocking the gas direct inflation air bag installation port, and after the gasket 4 is pressurized, it can further fill the gap between the retaining ring 3 and the gas generator flange 21 to avoid the airflow impacting the bag 1 panel under the retaining ring 3.

[0043] Based on this, this specification proposes a solution: Figure 1 As shown, an airbag device of the present invention is provided with a second hole 5 on the cushion 4, which is sleeved on the plug-in part of the gas generator 2 and is located on the side of the retaining ring 3 close to the cloth piece of the bag 1. The inner side edges of the second hole 5 are all attached to the outer periphery of the plug-in part of the gas generator 2 or closer to the outer periphery of the plug-in part of the gas generator 2 than the retaining ring 3, thereby preventing the airflow from impacting the bag 1 panel from between the retaining ring 3 and the outer periphery of the gas generator 2 or the airflow from outward from between the retaining ring 3 and the outer periphery of the gas generator 2.

[0044] The following describes the technical solutions provided by various embodiments of the present application in conjunction with the accompanying drawings.

[0045] Example 1

[0046] like Figure 1 As shown, an airbag device provided by an embodiment of the present invention includes a bag 1, a gas generator 2 and a retaining ring 3 located in the bag 1. The insertion portion of the gas generator 2 is inserted into the bag 1 through the installation opening on the bag 1, and its flange 21 is located on the outside of the bag 1; the retaining ring 3 has a first hole, and is sleeved on the insertion portion of the gas generator 2 through the first hole.

[0047] The airbag device described in the present invention can be a driver's airbag or a passenger's airbag, and the airbag device is installed in the steering wheel or on the passenger's instrument panel.

[0048] The bag 1 is expanded and located between the instrument panel and the passenger after being inflated.

[0049] The gas generator 2 is a pancake-shaped gas generator having a cylindrical plug-in portion and a flange 21 located at the bottom of the plug-in portion.

[0050] The retaining ring 3 and the flange 21 are fixedly connected by bolts, and a first circular hole is provided in the middle of the retaining ring 3 .

[0051] The retaining ring 3 includes a square or circular bottom panel and side walls arranged around the outer edge of the bottom panel, wherein the side walls stand on the bottom panel.

[0052] Specifically, first insert the retaining ring 3 into the bag 1 through the installation opening of the bag 1 or insert the retaining ring 3 into the bag 1 in advance, insert the insertion part of the gas generator 2 into the installation opening and into the bag 1, and then cover the inside of the retaining ring 3.

[0053] The airbag device also includes a cushion 4 and a fastener 6. The cushion 4 is provided with a second hole 5, which is sleeved on the plug-in part of the gas generator 2 and is located on the side of the retaining ring 3 close to the cloth piece of the bag 1. The inner edges of the second hole 5 are all attached to the outer periphery of the plug-in part of the gas generator 2 or the radial distance between the inner edge of the second hole 5 and the outer periphery of the plug-in part of the gas generator 2 is smaller than the radial distance between the inner edge of the first hole and the outer periphery of the plug-in part of the gas generator 2; the fastener 6 is arranged through the retaining ring 3, the cushion 4, the cloth piece of the bag 1, and the flange 21 of the gas generator 2 in sequence; wherein, when the cushion 4 is fixed by the fastener 6, the cushion 4 is compressed and deformed by the retaining ring 3 and the flange 21 of the gas generator 2, and fills the gap between the retaining ring 3 and the flange 21 of the gas generator 2.

[0054] The gasket 4 may be of a circular or square structure, and its shape may be flexibly set according to the shape of the flange 21 of the gas generator 2 or the retaining ring 3 .

[0055] Preferably, the cushion member 4 is a square structure as a whole.

[0056] The cushion 4 is sleeved on the gas generator 2 through the second hole 5 to guide the gas into the bag 1 and prevent the gas from flowing to the panel of the bag 1 where the installation port is located.

[0057] In this application, the insertion part of the gas generator 2 refers to the part inserted into the bag 1, and the air outlet of the gas generator 2 is located on the insertion part, and the cushion 4 is sleeved on the side of the insertion part of the gas generator 2 close to the flange 21 through the second hole 5.

[0058] When the inner side of the second hole 5 is in contact with the outer periphery of the insertion portion of the gas generator 2 , the inner diameter of the second hole 5 and the outer diameter of the insertion portion of the gas generator 2 are the same or have a slight tolerance.

[0059] Among them, the radial distance between the inner side of the second hole 5 and the outer periphery of the plug-in part of the gas generator 2 is much smaller than the radial distance between the inner side of the first hole and the outer periphery of the plug-in part of the gas generator 2, so as to prevent gas from flowing to the panel of the bag 1 where the installation port is located.

[0060] Among them, the fastener 6 can be a bolt and a nut, and the bolt passes through the corresponding holes on the retaining ring 3, the gasket 4, the sac 1 cloth piece and the flange 21 in sequence to cooperate with the nut to fix the retaining ring 3, the gasket 4, the sac 1 cloth piece and the flange 21 together.

[0061] In some embodiments, the gasket 4 and the retaining ring 3 are fixedly connected or integrally provided.

[0062] The working process of the present invention is to first insert the retaining ring 3 and the cushion 4 into the bag 1 in sequence, then insert the insertion part of the gas generator 2 into the bag 1, put the cushion 4 on the insertion part of the gas generator 2, and then continue to put the retaining ring 3 on the insertion part of the gas generator 2. Finally, use the fastener 6 to fasten the retaining ring 3, the cushion 4, the bag 1 cloth piece and the flange 21 of the gas generator 2 together, so as to prevent the gas from flowing out from the bolts and between the retaining ring 3 and the insertion part of the gas generator.

[0063] Furthermore, the rigidity of the gasket 4 is less than that of the retaining ring 3, and the rigidity of the gasket 4 is less than that of the flange 21 of the gas generator 2, so that when the fastener 6 is tightened, the gasket 4 is compressed to deform and extend between the retaining ring 3 and the flange 21 to fill the gap between the flange 21 and the retaining ring 3.

[0064] The retaining ring 3 and the flange 21 may be made of metal materials, such as stainless steel.

[0065] The cushion 4 is made of at least one material selected from the group consisting of plastic, rubber, and soft metal.

[0066] Preferably, the cushion 4 can be made of a material with low rigidity such as aluminum or plastic.

[0067] Furthermore, the diameter of the second hole 5 is smaller than the diameter of the installation opening of the bladder 1 to prevent gas from flowing out.

[0068] In some of these embodiments, Figures 2-3 As shown, the gasket 4 also includes a plurality of protrusions 7, which are arranged along the circumference of the gasket 4 on a side of the panel of the gasket 4 facing the mounting port, and are used to compress the cloth piece that fixes the bag 1 and / or fill the gap between the retaining ring 3 and the gas generator flange 21 after being compressed, and make the gasket 4 stably located between the retaining ring 3 and the panel of the bag 1 to avoid displacement of the gasket 4.

[0069] The plurality of protrusions 7 are evenly distributed on a side of the gasket 4 facing the panel where the mounting opening is located, so as to fill the gap between the retaining ring 3 and the flange 21 .

[0070] During the tightening process of the fastener 6, the protrusion 7 is flattened under the pressure of the flange 21 and the retaining ring 3, that is, it extends to the surroundings to fill the gap between the flange 21 and the retaining ring 3 to prevent gas from entering between the cushion 4 and the bag 1 cloth.

[0071] The rigidity of the protrusion 7 is also lower than the rigidity of the flange 21 and the retaining ring 3 .

[0072] In some of these embodiments, Figure 4 As shown, the side of the gasket 4 facing the panel where the installation port is located is a plastic-coated surface, and the plastic-coated surface has embossing formed by dot patterns or line-shaped ribs.

[0073] The overmolded surface is flattened or dispersed to the surroundings after being compressed to fill the gap between the flange 21 and the retaining ring 3 .

[0074] After being compressed, the embossing or dotting pattern of the gasket 4 extends to the surroundings and fills the gap between the retaining ring 3 and the gas generator flange 21 .

[0075] In some embodiments, the gasket 4 includes a plurality of fixing holes 8, which are arranged on the gasket 4 along the circumference of the gasket 4, and the inner diameter of the fixing holes 8 is larger than the inner diameter of the bolt holes on the retaining ring 3, so as to provide redundancy for the fastener 6 and prevent the gasket 4 from being unable to disperse or extend around after being compressed.

[0076] The inner diameter of the fixing hole 8 is made larger than the inner diameter of the bolt hole on the retaining ring 3 , thereby solving the problem of inconsistent verticality of the bolts after the gas generator 2 and the retaining ring 3 are installed.

[0077] In some of the embodiments, the cushion 4 includes a plurality of fixing holes 8, which are arranged on the cushion 4 along the circumference of the cushion 4. The inner side edge of the fixing hole 8 is provided with an inner protrusion 81 toward the center of the fixing hole 8. The inner protrusion 81 is arranged toward the center of the fixing hole 8 to provide redundancy for the fastener 6 to prevent the fastener 6 from being unable to disperse or extend to the surrounding area after passing through the cushion 4.

[0078] When the bolts are tightened for installation, the inner protrusion 81 is compressed and deformed to adapt to the alignment adjustment of the bolts with poor verticality.

[0079] The gasket 4 of the present invention is suitable as a barrier for the mounting of a circular gas generator 2, preventing gas from the gas generator 2 from directly charging into the airbag's mounting port and potentially burning through it due to high temperatures. The gasket 4 of the present invention also functions as a bolt spacer, offering wide coverage and adapting to the interference fit between each bolt and the retaining ring 3 when the force is applied. This improves the flatness of the entire gasket 4 after multiple bolts are tightened, resolving the issue of uneven overall tension between the retaining ring 3 and the flange 21 caused by the high torque of the rigid gasket 4.

[0080] Example 2

[0081] An embodiment of the present invention also provides an airbag device, including a bag, a gas generator and a retaining ring located in the bag, the insertion part of the gas generator is inserted into the bag through an installation opening on the bag, and its flange is located on the outside of the bag; the retaining ring has a first hole, and is sleeved on the insertion part of the gas generator through the first hole; the retaining ring is evenly provided with protrusions on the side facing the flange on the gas generator, and the protrusions are pressed and extended toward the surrounding when the retaining ring is fastened to the flange using fasteners.

[0082] The protrusions are preferably arranged around the bolt holes on the retaining ring so that when the retaining ring is fastened to the flange by fasteners, the protrusions are crushed to fill the gap between the flange and the retaining ring, thereby preventing gas from leaking from the bolted connection.

[0083] Furthermore, the protrusions are evenly arranged on the side surfaces of the retaining ring. When the fastener fastens the retaining ring to the flange, the protrusions are crushed to fill the gap between the retaining ring and the flange.

[0084] In the airbag device of the present invention, the panel near the bag installation port is pressed by the gasket and the protrusion, which can perform planar pressure on the panel, avoiding the gap between the retaining ring and the flange that causes the panel to be torn by the bolts, thereby increasing the safety of the bag when it is detonated.

[0085] In this specification, references to the same or similar parts between the various embodiments can be made to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the product embodiments described later, since they correspond to the methods, the description is relatively simple, and the relevant parts can be referred to the partial description of the system embodiment.

[0086] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. An airbag device, comprising a bag, a gas generator, and a retaining ring located within the bag, wherein the gas generator's insertion portion is inserted into the bag through a mounting opening on the bag, and a flange of the gas generator is located outside the bag; the retaining ring has a first hole and is inserted into the gas generator's insertion portion through the first hole; It is characterized by: Also includes: a cushion member, the cushion member being provided with a second hole and being sleeved on the insertion portion of the gas generator and being located on a side of the retaining ring close to the bladder cloth sheet, wherein the inner side edges of the second hole are both in contact with the outer periphery of the insertion portion of the gas generator or the radial distance between the inner side edges of the second hole and the outer periphery of the insertion portion of the gas generator is smaller than the radial distance between the inner side edges of the first hole and the outer periphery of the insertion portion of the gas generator; a fastener, the fastener being sequentially arranged through the retaining ring, the cushion, the bladder cloth sheet, and the flange of the gas generator; When the gasket is fixed by the fastener, the gasket is compressed and deformed by the retaining ring and the flange of the gas generator, and fills the gap between the retaining ring and the flange of the gas generator.

2. The airbag device according to claim 1, characterized in that The rigidity of the gasket is less than the rigidity of the retaining ring; and / or The rigidity of the gasket is lower than the rigidity of the flange of the gas generator.

3. The airbag device according to claim 1, wherein: The diameter of the second hole is smaller than the diameter of the mounting opening of the pouch.

4. The airbag device according to claim 1, wherein: The cushion also includes: A plurality of protrusions are arranged along the circumference of the gasket on a side of the panel facing the mounting port, for compressing and fixing the cloth piece of the bag and / or filling the gap between the retaining ring and the gas generator flange after being compressed.

5. The airbag device according to claim 4, characterized in that: After the gasket is compressed, the protrusion extends toward the periphery and fills the gap between the retaining ring and the gas generator flange.

6. The airbag device according to claim 1, characterized in that The side surface of the cushion member facing the panel where the installation opening is located is a plastic-coated surface, and the plastic-coated surface has embossing formed by dot patterns or line-shaped convex ribs.

7. The airbag device according to claim 6, characterized in that: After the gasket is compressed, the embossing or the dot pattern extends toward the periphery and fills the gap between the retaining ring and the gas generator flange.

8. The airbag device according to claim 2, characterized in that: The cushion is made of at least one material selected from the group consisting of plastic, rubber, and soft metal.

9. The airbag device according to any one of claims 1 to 8, characterized in that: The cushion comprises: A plurality of fixing holes are provided on the gasket along the circumference of the gasket, and the inner diameter of the fixing holes is larger than the inner diameter of the bolt holes on the retaining ring.

10. The airbag device according to any one of claims 1 to 8, characterized in that: The cushion comprises: A plurality of fixing holes are provided on the cushion along the circumference of the cushion, an inner side edge of the fixing hole is provided with an inner protrusion toward the center of the fixing hole, and the inner protrusion is provided toward the center of the fixing hole.

11. An airbag device, comprising a bag, a gas generator, and a retaining ring located within the bag, wherein the insertion portion of the gas generator is inserted into the bag through a mounting opening on the bag, and a flange of the gas generator is located outside the bag; the retaining ring has a first hole and is inserted into the insertion portion of the gas generator through the first hole; It is characterized by: The retaining ring is evenly provided with convex points on a side facing the upper flange of the gas generator. When the retaining ring is fastened to the flange by using fasteners, the convex points are compressed and extended toward the surroundings.

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