JP6335170B2 - Air bag assembly - Google Patents

Description

Cross-reference of related patent applications

  This application claims the benefit of US Non-Provisional Patent Application No. 13 / 593,135, filed August 23, 2012. Non-provisional patent applications are incorporated herein by reference in their entirety.

  The present application relates generally to the field of vehicle airbags. More specifically, the present application relates to a deflector for an inflatable airbag that deflects fine particles emitted from an inflator and prevents formation of a hole in a vehicle airbag.

  Inflatable airbags that use an inflating device that generates gas upon ignition of pyrotechnics, stored gas, or a combination thereof are typically used to properly inflate the airbag cushion and maintain the integrity of the cushion fabric. It is necessary to diffuse the gas into it. In a normal inflatable airbag, an inflating device ignites a solid explosive that vaporizes after being liquefied to inflate the airbag cushion. This method is known to open a plurality of holes in the lumbar chamber of the side airbag cushion as a result after deployment in a static deployment test at 85 degrees and 100 degrees, resulting in undesirable health problems. The need for deflectors is particularly noticeable in high pressure systems, rapid deployment systems, or systems that generate large amounts of heat and / or particulates through gas generation in combustion processes.

  The diffuser provided in the conventional airbag employs an open path diffusion method in which the inflation gas has a direct line of sight with respect to the discharge path of the gas diffuser. The line of sight is formed in a plurality of directions, left and right directions (for example, the annular diffuser illustrated in FIG. 8), one direction (for example, the bottom direction illustrated in FIG. 9), or multiple directions (for example, the gas sleeve illustrated in FIG. 10). Can be done. However, in existing types of diffusers, the inflation gas changes direction only once before it is exhausted from the diffuser. The diffuser is designed to redirect any inflation gas before the airbag is inflated so that any particulate by-products released from the inflator by the gas generation process do not enter the airbag cushion. However, the diffuser has a leak location or leak region where the fine particle by-product released from the inflator reaches the airbag cushion and forms a large hole in the airbag.

  There is a need to provide a deflector at a specific part of the diffuser that deploys in an angled shape to divert any particulate by-products emitted from the inflator and prevent any particulate by-products from reaching the airbag cushion .

  Embodiments of the invention relate to an airbag assembly. The airbag assembly includes an airbag cushion, an inflator that provides inflation gas for inflating the airbag cushion, a diffuser disposed between the inflator and the airbag cushion, and between the inflator and the diffuser. And a deflector disposed on the surface. The diffuser forces the inflation gas to change flow direction at least once before the inflation gas is exhausted from the diffuser and enters the airbag cushion. The deflector deflects the fine particles emitted from the inflator to a predetermined portion of the diffuser and prevents the fine particles from entering the airbag cushion.

  Another embodiment relates to an airbag assembly. The airbag assembly includes an airbag cushion, an inflator that provides inflation gas for inflating the airbag cushion, a diffuser disposed between the inflator and the airbag cushion, and between the inflator and the diffuser. And a deflector disposed on the surface. The diffuser comprises a plurality of panels that force the inflation gas to change flow direction at least twice before inflation gas is exhausted from the diffuser and enters the airbag. Each of the plurality of panels includes a plurality of openings through which the inflation gas passes. An opening on a panel does not coincide with an opening on an adjacent panel. The deflector deflects the fine particles emitted from the inflator to a predetermined portion of the diffuser and prevents the fine particles from entering the airbag cushion.

  Yet another embodiment relates to a method of manufacturing an airbag assembly. A method for manufacturing an airbag assembly includes providing a panel comprising a body portion and a rectangular flap. The rectangular flap includes a first mark line, a second mark line, and a third mark line. The rectangular flap is folded along the first, second and third mark lines to form a deflection surface. The panel is then folded along the longitudinal centerline of the panel. The folded panel is attached to an inflator, a diffuser, or a combination thereof.

  It should be understood that the foregoing summary and the following detailed description are exemplary and are intended for purposes of illustration only and do not limit the claimed invention.

  The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate a preferred embodiment of the invention and together with the description illustrate the principles of the invention.

FIG. 1A is a perspective view illustrating a portion of a vehicle interior including an airbag assembly including a diffuser according to an exemplary embodiment.

FIG. 1B is a perspective view illustrating a vehicle with an airbag assembly including a diffuser according to an exemplary embodiment.

FIG. 2 is a cross-sectional view of a prior art airbag assembly.

FIG. 3 is a front view illustrating a first panel for a diffuser having a complex path between an entrance and exit according to an exemplary embodiment.

FIG. 4 is a front view illustrating a second panel for a diffuser having a complex path between an entrance and exit according to an exemplary embodiment.

FIG. 5 is a front view illustrating a state in which the panels illustrated in FIGS. 3 and 4 are overlaid according to an exemplary embodiment.

FIG. 6 is a front view of a diffuser having a complex path between the entrances and exits according to an exemplary embodiment, showing the stacked panels shown in FIG. 5 folded at the center line.

FIG. 7 is a cross-sectional view taken along line 7-7 of the diffuser shown in FIG. 6 and shows a complicated path between the inlet and outlet of the inflation gas when the diffuser is disposed in the airbag assembly together with the airbag cushion and the inflator. .

FIG. 8 is a front view showing the prior art of a diffuser having outlets on both sides.

FIG. 9 is a front view showing the prior art of a diffuser with a unidirectional outlet along the bottom.

FIG. 10 is a front view showing the prior art of a diffuser having multidirectional outlets.

FIG. 11 is a front view illustrating a panel for a deflector according to an exemplary embodiment.

FIG. 12A is an isometric view of the panel shown in FIG. 11 including a body portion forming a deflection surface and a rectangular flap.

12B is an isometric view of the panel shown in FIG. 11 including a body portion that forms a deflection surface and a rectangular flap.

12C is an isometric view of the panel shown in FIG. 11 including a body portion that forms a deflection surface and a rectangular flap.

FIG. 12D is an isometric view showing an exemplary embodiment of a deflector, showing the panel shown in FIG. 11 folded along a centerline.

13 is a front view illustrating a state in which the deflector illustrated in FIG. 12D is overlaid on the diffuser illustrated in FIG. 6 according to an exemplary embodiment.

FIG. 14 is a front view showing a state in which the inflator is inserted into the deflector shown in FIG. 12D.

  Reference is made to FIGS. 1A and 1B illustrating a vehicle 10 according to an exemplary embodiment. The vehicle 10 includes one or more seats configured to receive occupants, which are coupled to the vehicle. The airbag and airbag module 20 are located at any location on the vehicle to protect the vehicle occupant in any impact event. For example, the airbag is disposed in a dashboard, in the vicinity of the steering wheel, in a vehicle seat, in a door trim panel, in a headliner, or the like. According to an exemplary embodiment, as shown in FIG. 1A, the steering wheel airbag assembly 20 is coupled to a steering column. According to another exemplary embodiment, as shown in FIG. 1B, the side airbag assembly 20 is coupled to the vehicle seat.

  The prior art airbag assembly 120 shown in FIG. 2 includes an inflator 124 (eg, a gas generator), a diffuser 130, and an airbag cushion 122. For example, an inflator 124 such as a crater gas generator generates gas that inflates the airbag cushion 122 quickly at the time of impact or vehicle collision. The diffuser 130 is disposed between the inflator 124 and the airbag 122. An airbag assembly 120 that uses an inflator (e.g., inflator 124), stored gas, or a combination thereof that generates gas by crater ignition typically inflates the airbag cushion 122 properly to maintain the integrity of the cushion fabric. Therefore, it is necessary to diffuse gas into the airbag cushion 122. The need for diffuser 130 is particularly noticeable in high pressure systems, rapid deployment systems or systems that generate large amounts of heat by gas generation and / or generate particulates by a combustion process. Such a diffuser 130 generally includes a deflection surface or plate 136 that is perpendicular to the gas path from the gas generator 124. As a result, the gas changes direction, passes through the outlet path 138 and into the airbag cushion 122, causing the airbag cushion 122 to inflate. The diffuser 130 is configured to diffuse the inflation gas and capture all particulate byproducts generated from the gas generator 124. However, such conventional diffuser 130 allows inflation gases to have a common orientation and have a direct line of sight from inflator 124 to outlet 138.

  Reference is made to FIGS. 3-7 illustrating the airbag assembly 20. The airbag assembly 20 may be similar to the assembly 120, but creates a complex path between the outlets of the inflator 24 to force the inflation gas to be redirected multiple times (eg, the arrows in FIG. 7). And an improved diffuser 30 as shown in FIG. The diffuser 30 is disposed in the internal volume of the airbag cushion 22 and directs the combustion gas generated by the inflator 24 toward the airbag cushion 22 to inflate the airbag 22. Changing the direction multiple times helps to capture any particulates that are formed in the combustion process. In the embodiment, the diffuser 30 is configured to diffuse the expansion gas, capture the gas flow direction, and convert the gas flow to an unspecified direction. The diffuser 30 can effectively form a non-directional half-layer flow of gas.

  According to an exemplary embodiment, the inflation gas penetrates into the airbag cushion 22, which breaks through the outer skin or cover of the airbag assembly 20, and the vehicle occupant and steering wheel, dashboard or vehicle structure. Inflate between. For example, the airbag cushion 22 protrudes from the lower part of the outer cover of the steering wheel, the cut of the trim panel, the rear of the trim panel, between the two panels, or the seam. According to various embodiments, the airbag assembly 20 may be installed in a vehicle such as a glove box assembly or a trim panel below a roof rail, a trim panel along vertical pillars (A pillar, B pillar, and C pillar), a seat assembly, etc. It may be configured at other positions. The airbag assembly 20 can be arbitrarily configured to be used in various package requirements and may be tailored to meet the specific needs of the vehicle manufacturer.

  According to an exemplary embodiment, the diffuser 30 may be formed by connecting a pair of fabric panels 32, 34. The first fabric panel 32 shown in FIG. 3 and the fabric panel 34 shown in FIG. 4 are flexible members, and may be formed of a conventional airbag material such as high stretch nylon. Since these panels are formed of flexible members, the panels 32, 34 can be folded small into the airbag cushion 22 when the airbag assembly 20 is housed in a trim or cover element.

  The first panel 32 and the second panel 34 each include a neck 36 that forms a generally circular inlet and a plurality of openings 38. As shown in FIG. 5, the first panel 32 and the second panel 34 are overlapped. The openings 38 of the first panel 32 and the second panel 34 are configured so that the openings 38 of the first panel 32 do not coincide with the openings 38 of the second panel 34 when the panels 32, 34 are stacked. The According to an exemplary embodiment, the hole arrangement of the first panel 32 is a mirror image of the hole arrangement of the second panel 34. The panels 32 and 34 each include four identical openings 38 and are arranged to be mirror images of each other, but it should be understood that various arrangements are possible. For example, the opening 38 may be rectangular, elliptical, or other shape rather than circular. The opening 38 of the first panel 32 or the second panel 34 may not be a uniform size. Panels 32 and 34 may each include a plurality of differently shaped and sized openings 38. The openings 38 of the second panel 34 may be of a different size, shape, number or arrangement as compared to the openings 38 of the first panel 32.

  In order to constitute the diffuser 30, the stacked panels 32 and 34 are folded in half at their respective centerlines 35 and stitched together at the end 37. The two ends 37 of the first panel 32 and the two ends 37 of the second panel 34 are connected along a stitched seam. When folded in half and stitched together, the first panel 32 forms an inner chamber 40 enclosed within an outer chamber 42 formed by the second panel 34, as best shown in FIG. The neck portions 36 of the panels 32 and 34 form an inlet that allows the inflation gas from the inflator 24 to enter the inner chamber 40 formed by the first panel 32. The mounting tab 39 facilitates coupling the diffuser 30 to the inflator 24 and the vehicle frame (eg, a retainer or other mounting device). Although the panels 32 and 34 have been described as being sewn together, in other embodiments 37 may be coupled in other ways, such as adhesives or heat sensitive materials.

  In other embodiments, the diffuser 30 may be composed of two or more panels. One or more panels may be used to form the inner chamber 40, and one or more panels may be used to form the outer chamber 42. For example, according to another exemplary embodiment, the first panel 32 and the second panel 34 shown in FIGS. 3 and 4 may each be replaced with two panels. By overlapping the four panels and connecting the ends, the inner chamber 40 and the outer chamber 42 may be formed in the same manner as shown in FIG. It is assumed that the two sides are connected. In embodiments, an appropriate number of panels may be used to form the diffuser 30. For example, the diffuser 30 may include three, four, five, six, or more panels. The panel may have a mirror image similar to the structure described above and an offset hole array structure. The greater the number of panels that make up the diffuser 30, the more layers for gas diffusion and particulate capture.

  The gas from the inflator 24 enters the inner chamber 40 formed by the first panel 32 through the neck portion 36. Thereafter, the gas passes through the opening 38 of the first panel 32 and enters the outer chamber 42 between the second panel 34 and the first panel 32. Upon entering the outer chamber 40, the gas is forced to change direction by the cloth of the second panel 34 and flows laterally between the first panel 32 and the second panel 34. When the inflation gas reaches the opening 38 of the second panel 34, the gas changes direction again, escapes into the airbag cushion 22, and inflates the airbag cushion 22. The gas is shown to follow a symmetrical path at the top of the diffuser 30 and the bottom of the diffuser 30. In other embodiments, depending on the size, shape, arrangement, and number of openings 38 in the first panel 32 and the second panel 34, a greater percentage of the total gas flow rate may cause the opening at the top of the diffuser 30 or at the bottom of the diffuser 30. The portion 38 may be passed. In other embodiments, the opening 38 may be located either at the top of the diffuser 30 or at the bottom of the diffuser 30. In yet another embodiment, the gas is directed to the outside from the inner chamber 40 through the opening 38 on one side of the diffuser 30 and exits the diffuser 30 through the opening 38 on the other side of the diffuser 30. May be routed to a longer path.

  By forcing the inflation gas to enter the airbag cushion 22 following a complex and indirect path, the diffuser 30 causes the inflation gas to flow directly from the inflator to the outlet path of the gas filter, as shown in FIGS. Compared with a conventional diffuser having a line of sight, fine particles can be captured more effectively. By capturing the fine particles more effectively, the fine particles can escape into the airbag cushion and reduce the occurrence of undesirable damage to the cushion.

  Furthermore, the diffuser 30 shown in FIGS. 3-7 reduces the amount of heat to which the airbag cushion 22 is exposed. The diffuser 30 can absorb more heat from the gas by passing the hot inflating gas from the inflator 24 through a complicated path and through the inner chamber 40 and the outer chamber 42.

  By forming the diffuser 30 with the cloth panels 32 and 34, compared with a plastic or metal gas diffuser, cost can be reduced and the whole airbag package can be reduced in size. In addition, the flexible nature of the panels 32, 34 allows the diffuser 30 to be folded, rolled or otherwise compressed with the airbag 22. In this manner, the size of the stored airbag assembly 20 can be reduced, and the shape of the stored airbag assembly 20 can be adapted to suit various mounting positions.

  The illustrated diffuser 30 is configured to be used in a driver airbag assembly that is attached to a steering wheel (FIG. 1A) or a side airbag with a built-in seat (FIG. 1B). It can be applied to a wide variety of other airbag assemblies. For example, the diffuser 30 including a complicated route may be used for a passenger airbag and may be attached to a vehicle dashboard. According to other exemplary embodiments, the diffuser 30 including a complex gas path may be used in a knee airbag assembly or a side or rear curtain airbag assembly.

  According to an exemplary embodiment, the diffuser 30 may include a deflector 50 located in the inner chamber 40. As shown in FIG. 13, the diffuser may be formed by a first panel. As shown in FIG. 11, the deflector 50 may be formed by a single panel 43. The deflector panel 43 is a flexible member and is formed of a conventional airbag material, for example, high stretch nylon. Since the deflector panel 43 is formed of a flexible cloth material, the deflector panel 43 can be folded together with the airbag cushion 22 when the airbag assembly 20 is housed in a trim or cover part. The deflector 50 is configured to act as a separate layer that is a flexible fabric material that reinforces the airbag 22 without interfering with the operation of the airbag assembly 20. Thus, the addition of the deflector 50 does not impair the operation of the airbag assembly 20. Indeed, the addition of the deflector 50 improves the health of the airbag assembly 20.

  The deflector panel 43 includes a rectangular flap 44, a main body 46 that forms an inlet, a first tab 48, and a second tab 49. As shown in FIG. 11, the rectangular flap 44 may include mark lines 44A, 44B, 44C that form triangles 44A ', 44B', 44C 'for ease of assembly. As shown in FIG. 12A, to configure the deflector 50, first, the rectangular flap 44 is folded along the mark line 44C so that the rectangular flap 44 is perpendicular to the main body 46 of the panel 43 (FIG. 12A). ). Next, as shown in FIG. 12B, the rectangular flap 44 is folded along the mark line 44 </ b> A, and the triangle 44 </ b> A ′ is sewn to the main body 46. The mark line 44 </ b> A coincides with the end of the panel 43 on the opposite side of the center line 45. As shown in FIG. 12C, the rectangular flap 44 is further folded inward along the mark line 44 </ b> B so that 44 </ b> B ′ and 44 </ b> C ′ are triangular in the main body 46 of the panel 43. The triangles 44B ′ and 44C ′ are sewn to the main body portion 46 in order to maintain the shape. Thereafter, as shown in FIG. 12D, the panel 43 is folded along the center line 45, and the end portion 47 is sewn.

  As shown in FIG. 13, the deflector 50 has a second tab 49 overlaid on the mounting tab 39 and a centerline 45 before the stacked panels 32, 34 are folded in half along their respective centerlines. It is positioned on the panels 32 and 34 that are stacked to coincide with the center line 36. The second tab 49 is sewn to the mounting tab 39. As shown in FIG. 6, the stacked panels 32 and 34 are folded in half along their respective centerlines, and the end 37 is sewn. The body portion 46 of the panel 43 forms an inlet that allows the inflation gas from the inflator 24 to be deflected to a specific portion of the inner chamber 40 formed by the first panel 32. FIG. 14 shows the assembled inflator 24, diffuser 30, and deflector 50. Although the panels 32, 34, and 42 have been described as being sewn, in other embodiments, the panels 32, 34, and 42, the triangles 44A ′, 44B ′, and 44C ′ and the end portion 47 are adhesives, heat sensitive materials, and the like. It may be connected in other ways.

  The deflector 50 is directly positioned in the outlet path of the inflator 24 so as to deflect the fine particle by-product emitted from the inflator 24 to a predetermined portion of the diffuser 30, and is developed into an angled shape. For example, in an embodiment, the particulate by-product may be deflected to the corners of the diffuser 30. In other words, the deflector 50 may be prevented from entering the center of the diffuser 30 having the opening 38 by deflecting the fine particle by-product toward the corner of the diffuser 30. Adding the deflector 50 to the diffuser 30 of the airbag assembly 20 reduces or prevents the possibility of particulate by-products colliding with the cushion fabric and forming holes after the airbag cushion 22 is deployed. The deflector 50 can deflect the particulate by-product from the inflator 24 to the corners of the diffuser 30, thereby preventing, for example, the particulate by-product from entering the chest region from the waist of the side airbag cushion. it can. By providing the deflector 50, the need for an inflatable airbag filter may be eliminated.

  In an exemplary embodiment, the diffuser 30 is configured with a plurality of panels configured to force a change in the direction of inflation gas flow at least twice before the inflation gas exits the diffuser and enters the airbag cushion. However, the deflector 50 and an existing diffuser may be used in combination. For example, the deflector 50 can be used for expanding gas such as a left-right diffuser (for example, the annular diffuser shown in FIG. 8), a unidirectional diffuser (shown in FIG. 9), or a multi-directional diffuser (for example, the gas sleeve shown in FIG. 10). You may use together with the diffuser which employ | adopts the open path diffusion method which has a direct line of sight with respect to the exit path | route of a gas diffuser. In other words, the deflector 50 may be used in conjunction with a diffuser that is configured to force the flow direction to change only once before the inflation gas exits the diffuser and enters the airbag cushion.

  It should be understood that the foregoing summary and detailed description are exemplary and are intended for purposes of illustration only and are not intended to limit the invention.

  For the purposes of disclosure, the term “connection” means a direct, indirect or other connection of two components (electrical or mechanical). Such joining may be stationary or movable. Such a joint is formed by two components (electrical or mechanical) and another additional intermediate member formed as a single unit, or two components or two components and an additional member. May be obtained by adhering to each other. Such a bond may be permanent or selective, and may be removable or releasable.

The configuration and arrangement of the diffuser shown in the preferred and other exemplary embodiments is merely illustrated. While this disclosure has described in detail several embodiments of the airbag assembly of the present invention, it should be understood that various modifications can be made without departing significantly from the novel teachings and advantages of the present invention described herein. It will be easily understood by those skilled in the art (for example, various element sizes, dimensions, structures, various element shapes and ratios, parameter values, attachment methods, members used, orientation, etc. ). Accordingly, all of these variations that can be achieved by those skilled in the art with this disclosure are included as still other embodiments of the present invention within the scope of the present invention. The order and arrangement of processes or methods may be changed or rearranged according to alternative embodiments. The design, processing status and arrangement of the preferred and other exemplary embodiments may be substituted, modified, changed or omitted without departing from the scope of the invention.

Claims (13)

An airbag cushion,
An inflator configured to provide inflation gas for inflating the airbag cushion;
A diffuser disposed between the inflator and the airbag cushion and configured to forcibly change the flow direction of the inflation gas at least once before the inflation gas is discharged and enters the airbag cushion When,
Wherein disposed between the inflator and the diffuser, e Bei and a configured deflector as particulates emitted in a predetermined portion of the diffuser from the inflator is prevented from entering into the airbag cushion,
The deflector includes a panel including a main body portion and a rectangular flap,
The body portion forms an inlet for the inflation gas to enter the deflector;
The rectangular flap forms a deflection surface configured to deflect the inflation gas to a predetermined portion of the diffuser so as to prevent fine particles emitted from the inflator from entering the center of the diffuser.
An airbag assembly characterized by that.   The airbag assembly according to claim 1, wherein the diffuser includes a first panel and a second panel, and the first panel and the second panel are cloth panels.   Each of the first panel and the second panel of the diffuser includes at least one opening through which the inflation gas passes, and the second panel includes at least one opening on the second panel and the first panel. The airbag assembly according to claim 2, wherein the airbag assembly is overlaid on the first panel such that the at least one opening on the panel does not overlap.   The first panel and the second panel of the diffuser each include an opening through which the inflation gas passes, and the arrangement of the openings in the first panel is a mirror image of the arrangement of the openings in the second panel. The airbag assembly according to claim 2.   The airbag assembly of claim 1, wherein the deflector includes a single fabric panel.   The airbag assembly of claim 1, wherein the deflector is substantially contained within the diffuser. An airbag cushion,
An inflator configured to provide inflation gas for inflating the airbag cushion;
Arranged between the inflator and the airbag cushion and configured to forcefully change the flow direction of the inflation gas at least twice before the inflation gas is discharged and enters the airbag cushion A diffuser with a plurality of panels;
A deflector disposed between the inflator and the diffuser and configured to prevent fine particles released from the inflator to a predetermined portion of the diffuser from entering the airbag cushion, and
The deflector includes a panel including a main body portion and a rectangular flap,
The body portion forms an inlet for the inflation gas to enter the deflector;
The rectangular flap forms a deflection surface configured to deflect the inflation gas to a predetermined portion of the diffuser so as to prevent fine particles emitted from the inflator from entering the center of the diffuser;
The plurality of panels each include a plurality of openings through which the inflation gas passes, and the openings on one panel do not coincide with the openings on an adjacent panel;
An airbag assembly characterized by that. The airbag assembly of claim 7 , wherein the array of openings on the panel with the diffuser is a mirror image of the array of openings on an adjacent panel of the diffuser. The airbag assembly of claim 7 , wherein the deflector includes a single fabric panel. The airbag assembly of claim 7 , wherein the deflector is substantially contained within the diffuser. In the manufacturing method of the airbag assembly,
The airbag assembly is disposed between an airbag cushion, an inflator configured to provide inflation gas for inflating the airbag cushion, and between the inflator and the airbag cushion, and the inflation gas is discharged. A diffuser configured to forcibly change the flow direction of the inflation gas at least once before entering the airbag cushion, and disposed between the inflator and the diffuser, from the inflator to the diffuser A deflector configured to prevent fine particles released into a predetermined portion of the air bag from entering the airbag cushion,
The deflector includes a panel including a main body and a rectangular flap;
The rectangular flap includes a first mark line, a second mark line, and a third mark line;
Folding the rectangular flap along the first mark line, the second mark line and the third mark line to form a deflection surface;
Folding the panel along a longitudinal centerline of the panel;
Attaching the folded panel to the inflator, the diffuser or a combination thereof;
A method for manufacturing an airbag assembly, comprising: The method of manufacturing an airbag assembly according to claim 11 , further comprising stitching the rectangular flap of the panel and an end of the main body. The method of manufacturing an airbag assembly according to claim 11 , wherein the deflector is configured such that fine particles emitted from the inflator are deflected to a predetermined portion from a deflection surface of the diffuser.