Bag-in-roof airbag and assembly method therefor

Abstract

A bag-in-roof airbag and an assembly method therefor. The bag-in-roof airbag comprises a gas generator (11) and an airbag (12) having a head end (12a) connected to the gas generator (11); in a folded state, a body portion (12b) of the airbag (12) first extends away from the gas generator (11) to form an air passage (12b1), and then is folded under the air passage (12b1), and a tail end (12c) of the airbag (12) is folded over the air passage (12b1); during inflation, the body portion (12b) first folded under the air passage (12b1) extends along the air passage (12b1) and is pushed out by the tail end (12c), and then the body portion (12b) is completely pushed out and drives the tail end (12c) to be pushed out, so that the airbag (12) is completely unfolded. The bag-in-roof airbag improves the folding mode of the airbag (12), so that the airbag (12) is unfolded downwards along the windshield during inflation, so as to avoid ejection and damage to the windshield, thereby ensuring the safety protection function of the bag-in-roof airbag.

Description

Front-mounted airbag and assembly method thereof TECHNICAL FIELD

[0001] The present application relates to the technical field of airbags, in particular to a front-mounted airbag and an assembly method thereof. BACKGROUND

[0002] In new energy vehicles and other vehicles, a front-mounted airbag (Bag-in-Roof, BiR) is assembled. The front-mounted airbag is assembled on the roof of the vehicle and is used to deploy when the vehicle collides head-on to protect the front-row passengers (including the driver and the front passenger).

[0003] The current front-mounted airbag has the problem that the airbag bag is easily ejected from the windshield during the deployment process, causing damage to the windshield. For example, referring to the application scenario of the current front-mounted airbag shown in FIG. 1; the front-mounted airbag 10' is assembled on the roof 20' of the vehicle, and when the vehicle collides, the gas generator 11' inflates the airbag bag 12', which is ejected from the windshield 30' during the deployment process, causing the windshield 30' to be damaged and broken.

[0004] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0005] Therefore, the present application provides a front-mounted airbag and an assembly method thereof. By improving the folding method of the airbag bag, the airbag bag is deployed downward along the windshield during the inflation process, avoiding ejection and damage to the windshield, thereby ensuring the safety protection function of the front-mounted airbag.

[0006] According to one aspect of the present application, a front-mounted airbag is provided, comprising a gas generator and an airbag bag connected to the gas generator, wherein: in a folded state, the body portion of the airbag bag is first extended away from the gas generator to form an air channel, and then folded under the air channel, and the tail end of the airbag bag is folded over the air channel; during inflation, the body portion folded under the air channel is pushed out along the air channel and pushed out by the tail end, and then the body portion is completely pushed out and the tail end is pushed out, so that the airbag bag is completely deployed.

[0007] In some embodiments, in the folded state, the first end is bent to form a push-out portion, a downward push-out space is formed between the push-out portion and the air channel, and the body portion folded under the air channel is accommodated in the downward push-out space; during inflation, the push-out portion is inflated first to push out the body portion folded under the air channel.

[0008] In some embodiments, the push-out portion is formed in a U shape.

[0009] In some embodiments, in the folded state, the body portion folded under the air passage is first folded down repeatedly, then folded up and folded up repeatedly along the path of the repeatedly folded down, and in the inflating process, the folded portion of the body portion folded under the air passage near the push-out portion is first pushed out.

[0010] In some embodiments, the body portion folded under the air passage is folded down and folded up twice, wherein the second folding down and the first folding up overlap and form the folded portion.

[0011] In some embodiments, the top-mounted front airbag further comprises: a wrapping cloth covering the airbag bag and the gas generator to form a wrapped assembly; and a shell accommodating the wrapped assembly, wherein a top end of the shell is provided with a hook portion.

[0012] In some embodiments, in the inflating process, the body portion is unfolded downward along the windshield, and in the unfolding process of the tail end, part of the body portion is inserted into the gap between the windshield and the instrument panel and abuts against the instrument panel.

[0013] According to another aspect of the present application, a method for assembling a top-mounted front airbag is provided, which is used for assembling the top-mounted front airbag as described in any of the above embodiments, and the method comprises an airbag bag folding process, which comprises: spreading the airbag bag to lay the head end, the body portion and the tail end of the airbag bag on a folding table, and the front surface of the airbag bag abuts against the folding table; folding the body portion back at a middle position of the body portion, so that the tail end is pressed between the air passage of the body portion and the folding table after the first folding; folding the body portion forward at a position near the air passage after the first folding, so that part of the body portion covers the air passage and part of the body portion covers the head end after the second folding; and folding the body portion forward which covers the head end in a direction opposite to the direction of the second folding, so that part of the body portion covers the air passage through part of the body portion after the second folding after the third folding, to form the airbag bag in the folded state.

[0014] In some embodiments, before the folding of the body portion back at the middle position of the body portion, the method further comprises folding the head end to form a push-out portion.

[0015] In some embodiments, after the spreading of the airbag bag, the body portion forms a redundant tongue portion which covers the body portion, and before the folding of the body portion back at the middle position of the body portion, the airbag bag folding process further comprises folding the free end of the tongue portion so that the free end is pressed between the tongue portion and the body portion.

[0016] In some embodiments, after the folding of the free end of the tongue portion and before the back folding of the body portion at the middle position of the body portion, the airbag bag folding process further comprises: folding the side edges of the body portion towards and away from the center of the body portion in sequence.

[0017] In some embodiments, the assembling method further comprises a housing assembly process performed after the airbag bag folding process, the housing assembly process comprising: covering the airbag bag and the gas generator with a cover cloth to form a wrapped assembly; and assembling the wrapped assembly into a housing to form the overhead front airbag.

[0018] The present application has at least the following beneficial effects compared with the prior art:

[0019] The overhead front airbag of the present application improves the folding method of the airbag bag, so that most of the body portion of the airbag bag is folded under the air passage formed by extending away from the gas generator, and the tail end of the airbag bag is folded over the air passage; in this way, during the inflation process, the body portion folded under the air passage is pushed out along the air passage and pressed by the tail end, so that the body portion unfolds downward along the windshield, avoiding ejection and damage to the windshield; then the body portion is completely pushed out and drives the tail end to be pushed out, so that the airbag bag is completely unfolded, so that the overhead front airbag plays a safety protection role; through the design of folding the tail end over the air passage, it can also achieve the process of driving part of the body portion to extend into the gap between the windshield and the instrument panel and adhere to the instrument panel during the unfolding of the tail end, so that the unfolding position of the overhead front airbag is accurate, effectively playing a safety protection role.

[0020] The overhead front airbag of the present application is particularly suitable for vehicles such as new energy vehicles, and can effectively protect the front row passengers by utilizing the characteristic that the airbag unfolds downward along the windshield.

[0021] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0022] The drawings incorporated into the specification and forming a part thereof, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained from these drawings without creative labor for those skilled in the art.

[0023] Fig. 1 shows a schematic diagram of the application scene of the current overhead front airbag;

[0024] Fig. 2 shows a structural schematic diagram of the top-mounted front airbag in a folded state according to an embodiment of the present application;

[0025] Fig. 3 shows a structural schematic diagram of the airbag bag of the top-mounted front airbag in an inflated state according to an embodiment of the present application;

[0026] Fig. 4 shows a schematic diagram of the top-mounted front airbag assembled in a vehicle according to an embodiment of the present application;

[0027] Figs. 5 to 7 show schematic diagrams of the inflation process of the top-mounted front airbag according to an embodiment of the present application;

[0028] Figs. 8 to 15 show schematic diagrams of the implementation process of the assembly method of the top-mounted front airbag according to an embodiment of the present application. DETAILED DESCRIPTION

[0029] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations can be implemented in any

[0030] The accompanying drawings are included to provide a further understanding of the present application, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application. In the drawings:

[0031] The terms "first", "second", and similar terms as used in the description are not used to denote any order, quantity, or importance, but are used to distinguish one component from another. The terms "head", "tail", "upper", "lower", "front", "back", and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are used only to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, in the description of the present application, when it is said that a device is "connected" to another device, it includes not only the case of direct connection, but also the case of indirect connection through other elements.

[0032] It should be noted that the features of the embodiments of the present application and the features in different embodiments can be combined with each other without conflict.

[0033] Fig. 2 shows the structure of the top-mounted front airbag in the folded state according to the embodiment of the present application, Fig. 3 shows the structure of the airbag bag of the top-mounted front airbag in the inflated state according to the embodiment of the present application, Fig. 4 shows the top-mounted front airbag according to the embodiment of the present application assembled in a vehicle, and Figs. 5 to 7 show the inflation process of the top-mounted front airbag according to the embodiment of the present application. In combination with Figs. 2 to 7, the top-mounted front airbag according to the embodiment of the present application comprises:

[0034] a gas generator 11 and an airbag bag 12 connected with the gas generator 11;

[0035] In the folded state, the body part 12b of the airbag bag 12 is first extended away from the gas generator 11 to form an air passage 12b1, and then folded under the air passage 12b1, and the tail end 12c of the airbag bag 12 is folded over the air passage 12b1.

[0036] In the inflation process, the body part 12b2 folded under the air passage 12b1 is pushed out along the air passage 12b1 and the tail end 12c, and then the body part 12b is completely pushed out and drives the tail end 12c to be pushed out, so that the airbag bag 12 is completely unfolded.

[0037] It should be noted that in the embodiment of the top-mounted front airbag, the folded state and the inflation process of the airbag bag 12 are described in the orientation of the top-mounted front airbag assembled in the vehicle. Wherein, the body part 12b2 folded under the air passage 12b1 and the tail end 12c folded over the air passage 12b1 are both relative to the roof 20 and the windshield 30. That is, when the top-mounted front airbag according to the present application is assembled in the vehicle, the tail end 12c is located below the roof 20 and the windshield 30, the air passage 12b1 is located below the tail end 12c, and the body part 12b2 is located below the air passage 12b1.

[0038] The top-mounted front airbag of the present application improves the folding mode of the airbag bag 12, so that most of the body part 12b2 of the airbag bag 12 is folded under the gas channel 12b1 formed by extending away from the gas generator 11, and the tail end 12c of the airbag bag 12 is folded over the gas channel 12b1; in this way, during the inflation process, the body part 12b2 folded under the gas channel 12b1 is pushed out along the gas channel 12b1 and is pressed by the tail end 12c, so that the body part 12b is unfolded downward along the windshield 30, avoiding ejection and damage to the windshield 30; then the body part 12b is completely pushed out and drives the tail end 12c to be pushed out, so that the airbag bag 12 is completely unfolded, thereby the top-mounted front airbag plays a safety protection role; through the design that the tail end 12c is folded over the gas channel 12b1, it can also achieve that part of the body part 12b is driven to extend into the gap between the windshield 30 and the instrument panel 40 and abuts against the instrument panel 40 during the unfolding of the tail end 12c, so that the unfolding position of the top-mounted front airbag is accurate, effectively playing a safety protection role.

[0039] The top-mounted front airbag of the present application is especially suitable for vehicles such as new energy vehicles, and can effectively protect the front passengers by utilizing the characteristic that the airbag is unfolded downward along the windshield.

[0040] In some embodiments, in the folded state, the first end 12a is bent to form a pushing-out part 121, a downward pushing-out space 122 is formed between the pushing-out part 121 and the gas channel 12b1, and the body part 12b2 folded under the gas channel 12b1 is accommodated in the downward pushing-out space 122; during the inflation process, the pushing-out part 121 is inflated first to push out the body part 12b2 folded under the gas channel 12b1.

[0041] The first end 12a is bent to form a pushing-out part 121, which can achieve that the pushing-out part 121 is inflated first to push out the body part 12b2 folded under the gas channel 12b1 during the inflation process, so that the body part 12b2 is unfolded along the gas channel 12b1 and is pressed by the tail end 12c; and the pushing-out part 121 is bent downward as a whole, and the gas channel 12b1 is located above the body part 12b2, so that a downward pushing-out space 122 acting on the body part 12b2 is formed between the pushing-out part 121 and the gas channel 12b1, which can push out the body part 12b2 downward during the inflation process, avoiding ejection and damage to the windshield 30 by the body part 12b.

[0042] In some embodiments, the pushing-out part 121 is formed in a U shape; in this way, the pushing-out part 121 can strongly push the body part 12b2 during the inflation and unfolding process. In other embodiments, the pushing-out part 121 can also be formed in other suitable shapes, as long as it can push the body part 12b2 located at the rear side thereof downward.

[0043] In some embodiments, in the folded state, the body portion 12b2 folded under the air passage 12b1 is first folded down repeatedly, then folded up repeatedly along the path of the repeatedly folded down, and the folded portion 123 of the body portion 12b2 folded under the air passage 12b1 is first pushed out during the inflation process.

[0044] Wherein, how the airbag bag 12 is folded to form the folded state will be described in the following assembly method embodiments; as described above, the folded state described in the embodiment of the overhead front airbag is described in the orientation of the airbag bag 12 folded and assembled into the vehicle.

[0045] By repeatedly folding the body portion 12b2 folded under the air passage 12b1, the speed of the body portion 12b2 can be accelerated, avoiding continuous winding and affecting the push-out, thereby accelerating the inflation process of the airbag bag 12. By the way of first repeatedly folding the body portion 12b2 down, then folding up and repeatedly folding up along the path of the repeatedly folded down, the body portion 12b2 forms a multi-layer stacked structure, which is beneficial to disperse the force during deployment and makes the body portion 12b2 regular and orderly, which is beneficial to the stable push-out of the body portion 12b2; in addition, the last time the body portion 12b2 is folded up to fold the tail end 12c over the air passage 12b1, so as to realize that the tail end 12c presses the body portion 12b during the inflation process, so that the body portion 12b unfolds down along the windshield 30.

[0046] In some embodiments, the body portion 12b2 folded under the air passage 12b1 is folded down and folded up twice, wherein the second time of folding down and the first time of folding up overlap and form a folded portion 123.

[0047] Specifically, in the present embodiment, the body portion 12b2 is first folded down and extends along the air passage 12b1 to the position close to the push-out portion 121, and then the body portion 12b2 is second folded down and extends to the tail end position of the air passage 12b1; then, the body portion 12b2 is folded up and extends to the position close to the push-out portion 121 and is first folded up again, and finally the body portion 12b2 extends to the tail end position of the air passage 12b1 and is second folded up, so that the tail end 12c is folded over the air passage 12b1.

[0048] By folding the body portion 12b2 down and up twice, a folded portion 123 is formed, which is beneficial to the rapid deployment of the body portion 12b2. In other embodiments, the number of repeated folds of the body portion 12b2 can be adjusted as needed.

[0049] In some embodiments, the overhead front airbag further includes: a covering (not specifically shown in Figures 2 to 7) covering the airbag bag 12 and the gas generator 11 to form a wrapping assembly; and a housing 18 housing the wrapping assembly, the top of the housing 18 being provided with a hook (not specifically shown in Figures 2 to 7) for mounting the overhead front airbag on the roof 20.

[0050] This invention also provides a method for assembling a roof-mounted front airbag, for assembling a roof-mounted front airbag as described in any of the above embodiments.

[0051] Figures 8 to 15 illustrate the main implementation process of the assembly method of the top-mounted front airbag in the embodiments of the present invention, wherein Figures 8 to 13 illustrate the airbag folding process, and Figures 14 and 15 illustrate the shell assembly process. Referring to Figures 8 and 11 to 13, the airbag folding process includes the following steps.

[0052] Referring to Figure 8, where 7a is a top view of the airbag 12 laid flat on the folding table 60, and 7b is a cross-sectional view of 7a (mm). The airbag 12 is laid out so that the first end 12a, the body 12b, and the last end 12c of the airbag 12 are laid flat on the folding table 60, and the front of the airbag 12 is against the folding table 60.

[0053] The front of the airbag 12 refers to the side of the airbag 12 facing the windshield after it is installed in the vehicle.

[0054] Before spreading out the airbag 12, the first end 12a of the airbag 12 can be connected to the gas generator 11.

[0055] Referring to Figure 11 and in conjunction with Figure 8, the first fold is performed as follows: The body portion 12b is folded backwards at its middle position, so that after the first fold, the tail end 12c is pressed between the air passage 12b1 (the air passage 12b1 refers to the part where the body portion 12b connects to the head end 12a) and the folding platform 60. Folding the body portion 12b backwards means folding the body portion 12b towards the folding platform 60; the specific folding direction is shown by arrow R1 in Figure 11.

[0056] Referring to Figure 12 and in conjunction with Figure 11, the second fold is performed by folding the main body 12b after the first fold forward near the airway 12b1, so that after the second fold, part of the main body 12b covers the airway 12b1 and part of the main body 12b covers the head end 12a. Folding the main body 12b forward means folding the main body 12b away from the folding table 60°, and the specific folding direction is shown by arrow R2 in Figure 12.

[0057] Referring to Figure 13 and in conjunction with Figure 12, the third fold is performed by folding in the opposite direction of the second fold (R3) to cover the main body 12b of the head end 12a, so that the part of the main body 12b after the third fold covers the airway 12b1 after the second fold, thus forming the airbag 12 in the folded state.

[0058] Based on the above embodiments of the overhead front airbag, it can be seen that in the folded state, the main body 12b of the airbag bag 12 first extends away from the gas generator 11 to form an airway 12b1, and then folds under the airway 12b1 (in the assembly method embodiment here, "the main body 12b2 covers the airway 12b1" corresponds to "the main body 12b2 is folded under the airway 12b1" as described in the above embodiments of the overhead front airbag), and the tail end 12c of the airbag bag 12 is folded over the airway 12b1 (in the assembly method embodiment here, "the tail end 12c is covered by the airway 12b1" corresponds to "the tail end 12c is folded over the airway 12b1" as described in the above embodiments of the overhead front airbag). Thus, as shown in Figures 2 to 7, during inflation, the main body 12b unfolds downwards along the windshield 30, ensuring reliable deployment of the top-mounted front airbag and preventing damage to the windshield 30. Furthermore, during the unfolding of the tail end 12c, part of the main body 12b extends into the gap between the windshield 30 and the instrument panel 40 and abuts against the instrument panel 40, ensuring accurate deployment of the top-mounted front airbag and effectively providing safety protection.

[0059] Each of the above folding steps can be achieved using a suitable tool or ruler.

[0060] Continue with the airbag folding process shown in Figures 8 to 13.

[0061] Referring to FIG8, before folding the body portion 12b back at the middle position, the method further includes folding the head end 12a to form the push-out portion 121. Specifically, the head end 12a can be folded along the C1 direction shown in FIG8 to form the push-out portion 121 using three ruler tools.

[0062] Referring to Figure 9 and in conjunction with Figure 8, after the airbag 12 is unfolded, the body portion 12b forms a redundant tongue portion 12b3, which covers the body portion 12b. Before folding the body portion 12b back at the middle position, the airbag folding process also includes folding the free end 12b3' of the tongue portion 12b3, so that the free end 12b3' is pressed between the tongue portion 12b3 and the body portion 12b.

[0063] By folding the free end 12b3' of the tongue 12b3, the unfolding process of the free end 12b3' of the tongue 12b3 can be controlled.

[0064] Furthermore, referring to Figure 10, and in conjunction with Figures 8 and 9, after folding the free end 12b3' of the tongue 12b3 and before folding the body part 12b inward at the middle position, the airbag folding process further includes: folding the sides of the body part 12b sequentially towards the center of the body part 12b and then away from the center of the body part 12b. Figure 10 illustrates the folding of the right side 12br of the body part 12b; first, the right side 12br is folded towards the center of the body part 12b, and then the right side 12br is folded away from the center of the body part 12b. The folding method of the left side 12bl of the body part 12b is the same as that of the right side 12br. In this way, the lateral dimensions of the airbag 12 can be reduced.

[0065] Referring to Figures 14 and 15, the housing assembly process is as follows: After the airbag bag 12 is folded, it and the gas generator 11 are covered by a fabric 16 to form a wrapping assembly; the wrapping assembly is then assembled into the housing 18 to form the overhead front airbag 10. The top of the housing 18 is provided with a hook 180 for mounting the overhead front airbag 10 to the vehicle roof.

[0066] In summary, based on the description of the embodiments and assembly methods of the overhead front airbag, the overhead front airbag 10 of the present invention improves the folding method of the airbag bag 12, so that most of the main body 12b2 of the airbag bag 12 is folded under the air passage 12b1 formed away from the gas generator 11, and the tail end 12c of the airbag bag 12 is folded over the air passage 12b1; thus, during inflation, the main body 12b2 folded under the air passage 12b1 is pushed out along the air passage 12b1 and pressed by the tail end 12c, so that the main body 12b2 follows the air passage 12b1. The windshield 30 unfolds downwards to prevent ejection and damage to the windshield 30; then the main body 12b is fully extended, driving the tail end 12c to extend, so that the airbag 12 is fully deployed, thereby enabling the top-mounted front airbag to play its safety protection role; through the design of the tail end 12c folding over the air passage 12b1, it is also possible to drive part of the main body 12b into the gap between the windshield 30 and the instrument panel 40 and abut against the instrument panel 40 during the deployment of the tail end 12c, so that the deployment position of the top-mounted front airbag is accurate and effectively plays its safety protection role.

[0067] The overhead front airbag of this invention is particularly suitable for vehicles such as new energy vehicles. It can effectively protect the front passengers by utilizing the characteristic of the airbag to deploy downward along the windshield.

[0068] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A top-mounted front airbag, comprising a gas generator and an airbag bag with its front end connected to the gas generator, characterized in that: In the folded state, the main body of the airbag first extends away from the gas generator to form an airway, and then folds under the airway, with the tail end of the airbag folded over the airway. During inflation, the main body, which is folded under the air passage, is pushed out along the air passage and pressed by the tail end. Then, the main body is fully pushed out and drives the tail end out, so that the airbag is fully deployed.

2. The overhead front airbag as described in claim 1, characterized in that, In the folded state, the head end is bent to form a push-out portion, and a downward push-out space is formed between the push-out portion and the air passage. The body portion folded under the air passage is accommodated in the downward push-out space. During the inflation process, the ejection section is inflated first to eject the main body section folded under the air passage.

3. The overhead front airbag as described in claim 2, characterized in that, The ejection section is U-shaped.

4. The overhead front airbag as described in claim 2, characterized in that, In the folded state, the main body folded under the airway first bends downwards repeatedly, then folds upwards and bends upwards repeatedly along the path of bending downwards repeatedly. During the inflation process, the bent portion of the main body folded under the air passage, near the ejection portion, is ejected first.

5. The overhead front airbag as described in claim 4, characterized in that, The main body folded under the airway bends downward and upward twice each, wherein the second downward bend and the first upward bend overlap to form the bend.

6. The overhead front airbag as described in claim 1, characterized in that, Also includes: A cloth is used to cover the airbag and the gas generator to form a wrapping assembly; A housing that contains the wrapping assembly, the top of the housing being provided with a hook.

7. The overhead front airbag as described in any one of claims 1-6, characterized in that, During the inflation process, the main body unfolds downwards along the windshield, and as the tail end unfolds, a portion of the main body extends into the gap between the windshield and the dashboard and comes into contact with the dashboard.

8. A method for assembling a top-mounted front airbag, characterized in that, For assembling a top-mounted front airbag as described in any one of claims 1-7, the assembly method includes an airbag folding process, the airbag folding process comprising: Lay out the airbag so that the first end, body and tail end of the airbag are laid flat on the folding table, and the front of the airbag is against the folding table. The main body is folded back at the middle position of the main body, so that after the first fold, the tail end is pressed between the air passage of the main body and the folding platform. Fold the body part after the first fold near the airway so that after the second fold, part of the body part covers the airway and part of the body part covers the head end. Fold the body portion at the head end in the opposite direction to the second fold, so that after the third fold, part of the body portion covers the airway via part of the body portion after the second fold, thus forming the airbag in the folded state.

9. The assembly method as described in claim 8, characterized in that, Before folding the body portion back at the middle position of the body portion, the method further includes: Fold the head end to form the push-out section.

10. The assembly method as described in claim 8, characterized in that, After the airbag is deployed, the main body forms a redundant tongue that covers the main body. Before folding the body portion back at the middle position of the body portion, the airbag folding process further includes: Fold the free end of the tongue so that the free end is pressed between the tongue and the body.

11. The assembly method as described in claim 10, characterized in that, After folding the free end of the tongue and before folding the body back at the middle position of the body, the airbag folding process further includes: The sides of the main body are folded sequentially toward the center of the main body and away from the center of the main body.

12. The assembly method according to any one of claims 8-11, characterized in that, It also includes a shell assembly process performed after the airbag folding process, the shell assembly process including: A wrapping assembly is formed by covering the airbag and the gas generator with a cloth. The package assembly is assembled into the housing to form the overhead front airbag.

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