Overhead front airbag and assembly method thereof

Abstract

The present invention relates to the technical field of airbags, and provides a top-mounted front airbag and an assembly method thereof. The top-mounted front airbag includes a gas generator and an airbag bag whose head end is connected to the gas generator; in a folded state, the main body of the airbag bag first extends away from the gas generator to form an airway, and then folds under the airway, and the tail end of the airbag bag is folded over the airway; during the inflation process, the main body folded under the airway is first pushed out along the airway and pressed by the tail end, and then the main body is completely pushed out and drives the tail end to be pushed out, so that the airbag bag is fully deployed. The present invention improves the folding method of the airbag bag so that 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 top-mounted front airbag.

Description

Technical Field

[0001] The invention relates to the technical field of safety airbags, in particular to a top-mounted front safety airbag and an assembling method thereof. Background Art

[0002] New energy vehicles and other vehicles are equipped with roof-mounted front airbags (Bag-in-Roof, BiR). The roof-mounted front airbag is installed on the roof and is used to deploy in the event of a frontal collision to provide safety protection for the front passengers (including the driver and the co-driver).

[0003] The problem with current top-mounted front airbags is that the airbag is easily ejected from the windshield during deployment, causing damage to the windshield. Figure 1 The application scenario of the current top-mounted front airbag is shown; the top-mounted front airbag 10' is installed on the roof 20'. When the vehicle collides, the gas generator 11' inflates the airbag bag 12', and the airbag bag 12' will eject the windshield 30' during the deployment process, causing the windshield 30' to be damaged and shattered.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0005] In view of this, the present invention provides a top-mounted front airbag and an assembly method thereof, which improves the folding method of the airbag bag so that the airbag bag can be unfolded downward along the windshield during the inflation process to avoid ejection and damage to the windshield, thereby ensuring the safety protection function of the top-mounted front airbag.

[0006] According to one aspect of the present invention, there is provided a top-mounted front safety airbag, comprising a gas generator and an airbag bag having a head end connected to the gas generator, wherein: in a folded state, a main body of the airbag bag first extends away from the gas generator to form an airway, and then is folded under the airway, and a tail end of the airbag bag is folded over the airway; during inflation, the main body folded under the airway first is pushed out along the airway and pressed by the tail end, and then the main body is completely pushed out and drives the tail end to be pushed out, so that the airbag bag is fully deployed.

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

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

[0009] In some embodiments, in the folded state, the main body portion folded under the airway is first bent back and forth downward, then folded upward and bent back and forth upward along the reciprocating downward bending path; during the inflation process, the bent portion of the main body portion folded under the airway close to the pushing portion is pushed out first.

[0010] In some embodiments, the main body portion folded under the airway is bent downward and upward twice each, wherein the second downward bend and the first upward bend overlap to form the bent portion.

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

[0012] In some embodiments, during the inflation process, the main body portion unfolds downward along the windshield, and during the unfolding process of the tail end, part of the main body portion is driven to extend into the gap between the windshield and the instrument panel and abut against the instrument panel.

[0013] According to another aspect of the present invention, there is provided a method for assembling a top-mounted front airbag, which is used for assembling a top-mounted front airbag as described in any of the above-mentioned embodiments, the method comprising an airbag bag folding process, the airbag bag folding process comprising: spreading the airbag bag so that the head end, the main body and the tail end of the airbag bag are laid flat on a folding table, and the front side of the airbag bag is against the folding table; folding the main body back at a middle position of the main body so that the tail end is pressed between the airway of the main body and the folding table after the first folding; folding the main body after the first folding at a position close to the airway so that after the second folding, part of the main body covers the airway and part of the main body covers the head end; folding the main body covering the head end forwardly in a direction opposite to the second folding direction so that after the third folding, part of the main body covers the airway through the part of the main body after the second folding, so as to form the airbag bag in a folded state.

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

[0015] In some embodiments, after the airbag bag is spread out, the main body forms a redundant tongue, and the tongue covers the main body; before the main body is folded back at the middle position of the main body, the airbag bag folding process also includes: folding the free end of the tongue so that the free end is pressed between the tongue and the main body.

[0016] In some embodiments, after folding the free end of the tongue and before folding the main body back at the middle position of the main body, the airbag bag folding process also includes: folding the side edges of the main body toward the center of the main body and away from the center of the main body successively.

[0017] In some embodiments, the assembly method also includes a shell assembly process performed after the airbag bag folding process, and the shell assembly process includes: wrapping the airbag bag and the gas generator with a wrapping cloth to form a wrapping assembly; assembling the wrapping assembly into the shell to form the top-mounted front airbag.

[0018] The beneficial effects of the present invention compared with the prior art include at least:

[0019] The top-mounted front safety airbag of the present invention improves the folding method of the airbag bag, so that most of the main body of the airbag bag is folded under the airway formed by extending away from the gas generator, and the rear end of the airbag bag is folded over the airway; in this way, during the inflation process, the main body folded under the airway is pushed out along the airway and pressed by the rear end, so that the main body is unfolded downward along the windshield to avoid catapulting and damaging the windshield; then the main body is completely pushed out and drives the rear end to be pushed out, so that the airbag bag is completely unfolded, so that the top-mounted front safety airbag plays a safety protection role; through the design that the rear end is folded over the airway, it is also possible to achieve that during the unfolding of the rear end, part of the main body is driven to extend into the gap between the windshield and the instrument panel and abut against the instrument panel, so that the unfolding position of the top-mounted front safety airbag is accurate and the safety protection role is effectively played.

[0020] The top-mounted front safety airbag of the present invention is particularly suitable for vehicles such as new energy vehicles, and can effectively provide safety protection for front-row passengers by utilizing the characteristic of the airbag deploying downward along the windshield.

[0021] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings herein are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present invention, and together with the specification are used to explain the principles of the present invention. Obviously, the accompanying drawings described below are only some embodiments of the present invention, and for those of ordinary skill in the art, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0023] Figure 1 A schematic diagram showing the application scenarios of current overhead front airbags;

[0024] Figure 2A schematic diagram showing the structure of a top-mounted front airbag in a folded state according to an embodiment of the present invention;

[0025] Figure 3 A schematic diagram showing the structure of an airbag bag of a top-mounted front safety airbag in an inflated state in an embodiment of the present invention;

[0026] Figure 4 A schematic diagram showing a top-mounted front airbag installed in a vehicle according to an embodiment of the present invention;

[0027] Figures 5 to 7 A schematic diagram showing the inflation process of the overhead front airbag in an embodiment of the present invention;

[0028] Figures 8 to 15 A schematic diagram showing the implementation process of the method for assembling a top-mounted front airbag in an embodiment of the present invention. DETAILED DESCRIPTION

[0029] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments described herein. Instead, these embodiments are provided to make the present invention more comprehensive and complete and to fully convey the concepts of the example embodiments to those skilled in the art.

[0030] The accompanying drawings are only schematic illustrations of the present invention and are not necessarily drawn to scale. The same reference numerals in the drawings represent the same or similar parts, and thus their repeated description will be omitted.

[0031] The terms "first", "second" and similar words used in the specific description do not indicate any order, quantity or importance, but are only used to distinguish different components. The terms "first", "last", "upper", "lower", "positive", "negative" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, in the description of the present invention, when it is said that a certain device is "connected" to another device, this includes not only the case of direct connection, but also the case of indirect connection through other elements.

[0032] It should be noted that, in the absence of conflict, the embodiments of the present invention and features in different embodiments may be combined with each other.

[0033] Figure 2 The structure of the top-mounted front airbag in the folded state according to the embodiment of the present invention is shown schematically. Figure 3 The structure of the airbag bag of the top-mounted front airbag in the inflated state in the embodiment of the present invention is shown schematically. Figure 4The top-mounted front airbag of the embodiment of the present invention is shown to be installed in a vehicle. Figures 5 to 7 The inflation process of the top-mounted front airbag according to an embodiment of the present invention is illustrated. Figures 2 to 7 As shown, the top-mounted front airbag provided by the embodiment of the present invention includes:

[0034] A gas generator 11 and an air bag 12 whose head end 12a is connected to the gas generator 11;

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

[0036] During the inflation process, the main body 12b2 folded under the airway 12b1 is first pushed out along the airway 12b1 and pressed by the tail end 12c, and then the main body 12b is completely pushed out and drives the tail end 12c to be pushed out, so that the airbag 12 is fully deployed.

[0037] It should be noted that in the embodiment of the top-mounted front airbag, the folding state and inflation process of the airbag bag 12 are described based on the orientation of the top-mounted front airbag installed in the vehicle. The main body 12b2 is folded under the airway 12b1, and the tail end 12c is folded over the airway 12b1, both relative to the roof 20 and the windshield 30. That is, when the top-mounted front airbag of the present invention is installed in the vehicle, the tail end 12c is located below the roof 20 and the windshield 30, the airway 12b1 is located below the tail end 12c, and the main body 12b2 is located below the airway 12b1.

[0038] The top-mounted front airbag 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 airway 12b1 formed by extending away from the gas generator 11, and the tail end 12c of the airbag bag 12 is folded over the airway 12b1; thus, during the inflation process, the main body 12b2 folded under the airway 12b1 is pushed out along the airway 12b1 and pressed by the tail end 12c, so that the main body 12b is unfolded downward along the windshield 30 to avoid ejection. , damaging the windshield 30; and then the main body 12b is completely pushed out and drives the rear end 12c to be pushed out, so that the airbag 12 is fully deployed, so that the top-mounted front airbag plays a safety protection role; through the design that the rear end 12c is folded over the airway 12b1, it is also possible to achieve that during the deployment of the rear end 12c, part of the main body 12b is driven to extend into the gap between the windshield 30 and the instrument panel 40 and abut against the instrument panel 40, so that the deployment position of the top-mounted front airbag is accurate and the safety protection role is effectively played.

[0039] The top-mounted front safety airbag of the present invention is particularly suitable for vehicles such as new energy vehicles, and can effectively provide safety protection for front-row passengers by utilizing the characteristic of the airbag deploying downward along the windshield.

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

[0041] The front end 12a is bent to form a pushing portion 121, which can achieve that during the inflation process, the pushing portion 121 is first inflated to push out the main body 12b2 folded under the airway 12b1, so that the main body 12b2 is unfolded along the airway 12b1 and is pressed by the rear end 12c; and the pushing portion 121 is bent downward as a whole, and the airway 12b1 is located above the main body 12b2, so that a downward pushing space 122 acting on the main body 12b2 is formed between the pushing portion 121 and the airway 12b1, which can push the main body 12b2 downward during the inflation process to prevent the main body 12b from being ejected and damaging the windshield 30.

[0042] In some embodiments, the push-out portion 121 is formed in a U-shape. In this way, the push-out portion 121 can forcefully push the main body portion 12b2 during the inflation and deployment process. In other embodiments, the push-out portion 121 can also be formed in other suitable shapes as long as it can push the main body portion 12b2 located at its rear side downward.

[0043] In some embodiments, in the folded state, the main body portion 12b2 folded under the airway 12b1 is first bent reciprocatingly downward, then folded upward and bent reciprocatingly upward along the reciprocating downward bending path; during the inflation process, the bent portion 123 of the main body portion 12b2 folded under the airway 12b1 close to the pushing portion 121 is pushed out first.

[0044] Specifically, how the airbag bag 12 is folded to form a folded state will be described in the following assembly method embodiment; as described above, the folded state described in the embodiment of the top-mounted front airbag is described based on the orientation of the airbag bag 12 after it is folded and assembled into the vehicle.

[0045] By reciprocating the bending of the main body 12b2 folded under the air passage 12b1, the pushing speed of the main body 12b2 can be accelerated, and the continuous winding that affects the pushing can be avoided, thereby accelerating the inflation process of the airbag 12. The main body 12b2 is first reciprocated downwardly bent, then folded upwardly and reciprocated upwardly bent along the reciprocating downwardly bent path, so that the main body 12b2 forms a multi-layer stacking structure, which is conducive to dispersing the force during the deployment, and makes the main body 12b2 regular and orderly, which is conducive to the stable pushing of the main body 12b2; in addition, the last upward bending of the main body 12b2 folds the tail end 12c over the air passage 12b1, so that the tail end 12c presses the main body 12b during the inflation process, so that the main body 12b is deployed downward along the windshield 30.

[0046] In some embodiments, the main body portion 12b2 folded under the airway 12b1 is bent downward and upward twice each, wherein the second downward bend and the first upward bend overlap to form a bent portion 123 .

[0047] Specifically, in this embodiment, the main body 12b2 is bent downward for the first time and then extends along the airway 12b1 to near the pushing portion 121, and then the main body 12b2 is bent downward for the second time and extends to the tail end of the airway 12b1; then, the main body 12b2 is folded upward and extends to near the pushing portion 121 and then bends upward for the first time, and finally, the main body 12b2 extends to the tail end of the airway 12b1 and then bends upward for the second time, so that the tail end 12c is folded over the airway 12b1.

[0048] The main body 12b2 is bent downward and upward twice to form a bending portion 123, which facilitates the rapid expansion of the main body 12b2. In other embodiments, the number of reciprocating bends of the main body 12b2 can be adjusted as needed.

[0049] In some embodiments, the top-mounted front airbag further comprises: a wrapping cloth ( Figures 2 to 7 (not specifically shown), covering the airbag bag 12 and the gas generator 11 to form a package assembly; a shell 18, accommodating the package assembly, and a hook portion ( Figures 2 to 7 (not specifically shown) so that the roof-mounted front airbag can be installed on the roof 20.

[0050] An embodiment of the present invention further provides a method for assembling a top-mounted front safety airbag, which is used to assemble a top-mounted front safety airbag as described in any of the above embodiments.

[0051] Figures 8 to 15 The main implementation process of the method for assembling the top-mounted front airbag in the embodiment of the present invention is shown in FIG. Figures 8 to 13 The airbag folding process is shown. Fig.14 and Fig.15The process of assembling the housing is shown in FIG. Figure 8 , Figures 11 to 13 As shown, the airbag bag folding process includes the following steps.

[0052] Reference Figure 8 7a is a top view of the airbag bag 12 laid flat on the folding table 60, and 7b is a MM cross-sectional view of 7a. The airbag bag 12 is spread so that the head end 12a, the body 12b and the tail end 12c of the airbag bag 12 are laid flat on the folding table 60, and the front side of the airbag bag 12 is against the folding table 60.

[0053] The front side of the airbag bag 12 refers to the side of the airbag bag 12 facing the windshield after being assembled in the vehicle.

[0054] Before the airbag bag 12 is deployed, the head end 12 a of the airbag bag 12 may be connected to the gas generator 11 .

[0055] Reference Fig.11 , and combined Figure 8 As shown, the first folding is: fold the main body 12b backward at the middle of the main body 12b, so that the tail end 12c is pressed between the air passage 12b1 (the air passage 12b1 refers to the part connecting the main body 12b and the head end 12a) of the main body 12b and the folding platform 60 after the first folding. Among them, folding the main body 12b backward means folding the main body 12b toward the folding platform 60. The specific folding direction is as follows: Fig.11 As indicated by arrow R1.

[0056] Reference Fig.12 , and combined Fig.11 As shown, the second folding is to fold the main body 12b after the first folding forwardly at a position close to the airway 12b1, so that after the second folding, part of the main body 12b covers the airway 12b1 and part of the main body 12b covers the head end 12a. Wherein, the forward folding of the main body 12b means folding the main body 12b away from the folding platform 60. The specific folding direction is as follows: Fig.12 As indicated by arrow R2.

[0057] Reference Fig.13 , and combined Fig.12 As shown, the third folding: fold the main body 12b covering the head end 12a in the direction R3 opposite to the second folding direction, so that the partial main body 12b after the third folding covers the airway 12b1 through the partial main body 12b after the second folding, so as to form the airbag 12 in the folded state.

[0058] In combination with the above-mentioned embodiment of the top-mounted front airbag, it can be known that: in the folded state, the main body 12b of the airbag bag 12 first extends away from the gas generator 11 to form the airway 12b1, and then folds under the airway 12b1 (the "main body 12b2 covers the airway 12b1" in the embodiment of the assembly method here corresponds to the "main body 12b2 is folded under the airway 12b1" described in the above-mentioned embodiment of the top-mounted front airbag), and the tail end 12c of the airbag bag 12 is folded over the airway 12b1 (the "tail end 12c is covered by the airway 12b1" in the embodiment of the assembly method here corresponds to the "tail end 12c is folded over the airway 12b1" described in the above-mentioned embodiment of the top-mounted front airbag). In this way, in combination with Figures 2 to 7 As shown, during the inflation process, the main body 12b can be deployed downward along the windshield 30, so that the deployment process of the overhead front airbag is reliable and damage to the windshield 30 is avoided. In addition, during the deployment of the tail end 12c, part of the main body 12b is driven to extend into the gap between the windshield 30 and the instrument panel 40 and abut against the instrument panel 40, so that the deployment position of the overhead front airbag is accurate and the safety protection function is effectively played.

[0059] In each of the above folding steps, it can be achieved with the help of a suitable tool ruler.

[0060] Continue to refer to Figures 8 to 13 The air bag folding process is shown.

[0061] Reference Figure 8 As shown in FIG. 1 , before folding the main body 12b at the middle of the main body 12b, the method further includes: folding the head end 12a to form a push-out portion 121. Specifically, three tool rulers can be used to Figure 8 The head end 12 a is folded in the C1 direction to form a push-out portion 121 .

[0062] Reference Fig. 9 , and combined Figure 8 As shown, after the airbag bag 12 is spread out, the main body 12b forms a redundant tongue 12b3, and the tongue 12b3 covers the main body 12b; before the main body 12b is folded back at the middle position of the main body 12b, the folding process of the airbag bag also includes: folding the free end 12b3' of the tongue 12b3 so that the free end 12b3' is pressed between the tongue 12b3 and the main body 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] Further, refer to Fig.10 , and combined Figure 8 and Fig. 9As shown, after folding the free end 12b3' of the tongue 12b3 and before folding the main body 12b inward at the middle of the main body 12b, the airbag folding process also includes: folding the side of the main body 12b toward the center of the main body 12b and away from the center of the main body 12b. Fig.10 In the figure, the right side 12br of the main body 12b is folded, and the right side 12br is first folded toward the center of the main body 12b, and then the right side 12br is folded away from the center of the main body 12b; the left side 12bl of the main body 12b is folded in the same way as the right side 12br. In this way, the lateral size of the airbag 12 can be reduced.

[0065] Reference Fig.14 and Fig.15 After the airbag bag 12 is folded, the airbag bag 12 and the gas generator 11 are wrapped with a wrapping cloth 16 to form a wrapping assembly; the wrapping assembly is then assembled into the shell 18 to form the roof-mounted front airbag 10. A hook 180 is provided at the top of the shell 18 to facilitate mounting the roof-mounted front airbag 10 on the roof.

[0066] In summary, the top-mounted front airbag embodiment and the assembly method embodiment are described. The top-mounted 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 airway 12b1 formed by extending away from the gas generator 11, and the tail end 12c of the airbag bag 12 is folded over the airway 12b1; thus, during the inflation process, the main body 12b2 folded under the airway 12b1 is pushed out along the airway 12b1 and pressed by the tail end 12c, so that the main body 12b2 is pushed out along the airway 12b1. The windshield 30 is unfolded downward to avoid catapulting and damaging the windshield 30; and then the main body 12b is completely pushed out and drives the rear end 12c to be pushed out, so that the airbag 12 is fully unfolded, so that the top-mounted front airbag plays a safety protection role; through the design that the rear end 12c is folded over the airway 12b1, it is also possible to achieve that during the unfolding process of the rear end 12c, part of the main body 12b is driven to extend into the gap between the windshield 30 and the instrument panel 40 and abut against the instrument panel 40, so that the deployment position of the top-mounted front airbag is accurate and the safety protection role is effectively played.

[0067] The top-mounted front safety airbag of the present invention is particularly suitable for vehicles such as new energy vehicles, and can effectively provide safety protection for front-row passengers by utilizing the characteristic of the airbag deploying downward along the windshield.

[0068] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A top-mounted front airbag, comprising a gas generator and an airbag bag whose head end is connected to the gas generator, characterized in that: In the folded state, the head end is bent to form a push-out portion; the main body of the airbag first extends away from the gas generator to form an airway, and then folds under the airway; wherein a downward push-out space is formed between the push-out portion and the airway, the main body folded under the airway is accommodated in the downward push-out space, and the main body folded under the airway is first bent downward twice, then folded upward and bent upward twice along the reciprocating downward bending path, wherein the first upward bending overlaps the second downward bending to form a bending portion close to the push-out portion; the tail end of the airbag is folded over the airway; During the inflation process, the pushing portion is inflated first and pushes out the bent portion, so that the main body folded under the airway is pushed out along the airway and pressed by the tail end, and then the main body is completely pushed out and drives the tail end to be pushed out, so that the airbag bag is fully deployed.

2. The overhead front airbag according to claim 1, characterized in that: The push-out portion is formed in a U shape.

3. The overhead front airbag according to claim 1, characterized in that: Also includes: A wrapping cloth, covering the airbag bag and the gas generator to form a wrapping assembly; The shell accommodates the wrapping assembly, and a hook is arranged at the top of the shell.

4. The overhead front airbag according to any one of claims 1 to 3, characterized in that: During the inflation process, the main body is unfolded downward along the windshield, and during the unfolding process of the tail end, part of the main body is driven to extend into the gap between the windshield and the instrument panel and abut against the instrument panel.

5. A method for assembling a top-mounted front airbag, characterized in that: Used to assemble a top-mounted front airbag as claimed in any one of claims 1 to 4, the assembling method includes an airbag bag folding process, the airbag bag folding process includes: Spreading the airbag bag so that the head end, the main body and the tail end of the airbag bag are laid flat on the folding table, and the front side of the airbag bag is against the folding table; folding the head end to form a push-out portion; Folding the main body backward at the middle of the main body so that the tail end is pressed between the airway of the main body and the folding platform after the first folding; Folding the main body portion after the first folding forwardly at a position close to the airway, so that after the second folding, part of the main body portion covers the airway and part of the main body portion covers the head end; The main body covering the head end is folded forward in a direction opposite to the second folding direction, so that the partial main body after the third folding covers the airway through the partial main body after the second folding, so as to form the airbag in a folded state.

6. The assembly method according to claim 5, characterized in that: After the airbag is spread out, the main body forms a redundant tongue portion, and the tongue portion covers the main body portion; Before folding the main body back at the middle position of the main body, the airbag bag folding process further includes: The free end of the tongue is folded so that the free end is pressed between the tongue and the body.

7. The assembly method according to claim 6, characterized in that: After folding the free end of the tongue and before folding the main body back at the middle of the main body, the airbag folding process further includes: The side edges of the main body are folded toward and away from the center of the main body.

8. The assembly method according to any one of claims 5 to 7, characterized in that: The invention also includes a shell assembly process performed after the airbag bag folding process, wherein the shell assembly process includes: Wrapping the airbag bag and the gas generator with a wrapping cloth to form a wrapping assembly; The wrapping assembly is assembled into a shell to form the top-mounted front airbag.

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