Airbag cover fabric

Abstract

The application discloses an air bag wrapping cloth which is combined by two laminated cloth pieces, a weakening line of the upper cloth piece is arranged to cross an instrument panel crackable line, the weakening line is arranged in an X direction, a long strip opening is arranged at the end of the weakening line to help the auxiliary air bag to smoothly expand from the wrapping cloth, a folding part is arranged on the lower cloth piece laminated on the upper cloth piece, and the two layers of the wrapping cloth as a whole play a role of isolating the air bag body and the left and right areas / frames in front of and behind the air bag door of the instrument panel in the air bag expansion process, so that the wear, rupture failure and other risks of the air bag caused by friction are reduced.

Description

Technical Field

[0001] This invention relates to the field of automotive passive safety device technology, specifically to an airbag wrapping fabric. Background Technology

[0002] Before an airbag is folded and installed in a vehicle, it needs to be wrapped with an airbag wrapping cloth to keep it in a folded state. Therefore, existing airbag wrapping cloths usually have high tensile strength, so that when wrapping the folded airbag, the wrapping cloth can fit tightly to the folded airbag, allowing the airbag to maintain a smaller folded size.

[0003] In existing technologies, when an airbag is inflated and deployed at high speed, it may come into contact with the airbag door hinge, which may cause the airbag to be punctured. This undoubtedly reduces the airbag's protective ability and stability. In addition, although increasing the size of the wrapping cloth can prevent the airbag from coming into contact with the airbag door hinge, it cannot tightly wrap the folded airbag.

[0004] Given that the existing technology cannot simultaneously ensure that the airbag wrapping fabric can tightly wrap the folded airbag and prevent the airbag from being torn by the airbag door hinge, a new technology solution is needed. Summary of the Invention

[0005] In view of this, embodiments of the present invention provide an airbag wrapping cloth, which is applied to an airbag device covered by a dashboard door cover. The airbag device includes components such as a folded bag and a gas generator. The airbag wrapping cloth includes a first cloth piece, which has a first tear line to form a burstable shape for the airbag wrapping cloth. An elongated opening is also provided at the end of the first tear line to cooperate in applying force to the first cloth piece when the airbag is deployed, so that the first tear line breaks more stably and quickly.

[0006] Because the second fabric piece has a folded part, and the folded part is thick, the first fabric piece covers it unevenly. The second tear line is located within the folded part as a fold, and within the spatial projection range of the width of the first tear line. When the airbag is deployed, because the two openings torn from the second tear of the second fabric piece are of different lengths, the tear line of the first fabric piece is under unstable stress or does not break at the weakened position of the first tear line. In order to make the first tear line tear according to the preset position, long strip openings are provided at both ends of the first tear line. When the airbag is deployed, the airbag first supports the second fabric piece, and the bulge protrudes from the long strip opening first. After the long strip opening is pushed, the stress is concentrated on the first tear line in the middle, making the weakened position of the first tear line more stable and breaking quickly.

[0007] Preferably, the length of the elongated opening is longer than the length of the first tear line, and the length of the elongated opening can cover at least 90% of the width of the instrument panel tear line in the Y direction.

[0008] The length of the elongated opening is designed to match the folding length of the airbag and the Y-direction length of the tear line on the dashboard airbag cover. The length of the weakened part of the first tear line matches the folding width of the airbag and the X-direction length of the tear line on the dashboard airbag cover. The length of the elongated opening covers at least 90% or more of the tear line on the dashboard, ensuring that the tear line of the second fabric piece unfolds from within the first fabric piece and can cover the edge of the dashboard airbag frame.

[0009] Preferably, the elongated opening of the first fabric piece extends across the end of the first tear line and has a cross-cut or a cross-shaped cut with the end of the first tear line.

[0010] Preferably, there are two elongated openings, each with a middle section and a bent extension section. The length of the first tear line is defined by the distance L between the middle sections of the two elongated openings. The four ends of the extension sections of the two elongated openings are brought together in pairs to form a stress concentration section. The length of the stress concentration section is shorter than the length of the first tear line.

[0011] To further ensure the unfolding effect of the elongated opening and the first tear line, a cross-shaped interlacing weakening design was created at the end of the first tear line and the elongated opening. From an engineering perspective, the cross-shaped blasting shape is more stable and the force is more evenly distributed.

[0012] Preferably, the airbag wrapping fabric further includes a second fabric piece, the second fabric piece having a second tear line, the middle area of ​​the second fabric piece forming multiple accordion-like folds in the X direction, after the folding is completed, a first weak seam is sewn on the folded area, and the second fabric piece is layered below the first fabric piece and above the folded airbag.

[0013] The second fabric piece is designed with a fold so that when the second fabric piece is unfolded, the fold can cover the edge of the dashboard airbag door frame, preventing the airbag from being torn during high-speed friction.

[0014] Preferably, the two openings covering the left and right sides of the airbag frame are Y-shaped openings formed after the first tear line of the first fabric piece breaks, and the two openings covering the front and rear edges of the airbag frame are X-shaped openings formed after the second tear line of the second fabric piece breaks.

[0015] This feature clarifies that after the first and second fabric pieces are torn, each cover safely covers the edge of the dashboard airbag frame around the perimeter, ensuring the integrity of the airbag during high-speed deployment.

[0016] Preferably, the long opening of the first fabric piece has a bent extension section, and the bent extension section forms a bending inflection point with the non-bent part of the long opening. A notch is provided on the second fabric piece, and the notch is located at the end of the flip axis of the two openings of the second fabric piece. When the two openings are extended outward through the first fabric piece, the notch resists the bending inflection point of the bent extension section of the long opening of the first fabric piece, forming a rigid flip axis for the two openings of the second fabric piece to flip towards the instrument panel airbag frame. At the same time, the design of the notch prevents irregular tearing at the resisting position.

[0017] Two long strip openings are the most stable design. If only one can be set, and the airbag is tilted when it deploys, the bent part at one end of the long strip opening that is pushed up by the bulge will be stressed first and can play a guiding role. At this time, the stress is concentrated at the bent extension of the long strip opening and its inflection point. The two openings of the second fabric piece interfere with the inflection point notch, forming an outward flipping force of the two openings of the second fabric piece in the Z direction. The remaining fabric pieces press against each other, so that the two openings form a rigid flipping axis.

[0018] To explain further, both the first and second fabric pieces have fixing parts that remain stationary when the covering fabric tears. These fixing parts press against each other as the two fabric pieces open and flip, creating interlocking resistance between the four flaps. This resistance exerts force on the first tear line, stabilizing and allowing it to tear quickly. The fold of the second fabric piece is broken open and unfolds from the long opening of the first fabric piece. This long opening is subjected to a tensile force in the X direction, the first tear line is subjected to a supporting force in the Z direction, and the inflection point is subjected to a force in the Y direction. This ensures that the first tear line, under multi-directional force, allows both flaps to open completely without being unstable and torn.

[0019] Preferably, the width l of each fold of the multi-layer folds on the second fabric piece is determined by fitting each preset width limiting hole, and the second tear line is one of the folds. After the folding is completed, the second tear line is attached to the surface of the folded airbag.

[0020] This is an improvement in the folding process, which eliminates the positioning method in conventional folding. Instead, it limits the width by using positioning holes. The second piece of fabric is folded multiple times according to the limited width l. Folding is done by fitting the holes onto the same positioning post. This results in fast folding speed, easy operation, and high consistency of the produced products.

[0021] Preferably, the first opening length A of the second fabric piece is longer than the second opening length B, the first opening of the second fabric piece faces the passenger side, the second opening of the second fabric piece faces the front of the vehicle, the seam between the two openings is the second tear line, the width C of the second fabric piece is less than the length of the long strip opening of the first fabric piece, and the second tear line and the first tear line are arranged in a cross projection.

[0022] Since the first opening of the second fabric panel faces the front of the vehicle and the second opening faces the passenger side, and the airbag deploys towards the passenger side, most of the airbag is mainly attached to the dashboard surface on the passenger side. Therefore, the second opening needs to reserve a larger length and area to ensure that the airbag is not rubbed by the edge of the dashboard airbag door.

[0023] Preferably, the first fabric piece is provided with a gas generator fixing part, which is sewn onto the airbag for fastening with a gas generator with bolts or a fixing device with bolts. The first fabric piece is also provided with multiple free ends, which are sleeved on bolts after the wrapping fabric wraps the folded airbag to tightly wrap the folded airbag.

[0024] Preferably, a gas generator mounting opening is provided at the gas generator fixing part of the first fabric piece.

[0025] Preferably, the free end of the first fabric piece may also have bolt fixing parts symmetrically arranged on both sides. After the gas generator fixing part and the free end of the front of the first fabric piece are wrapped tightly with the folded bag, the two symmetrical bolt fixing parts on both sides are further fitted onto the bolts to make the folded bag more compact.

[0026] Preferably, the second fabric piece has at least one gas generator fixing part and at least one free end. The gas generator fixing part of the second fabric piece is sewn onto the gas bag and fastened to the gas generator bolt or the fixing part with bolts. After the second fabric piece wraps the folded bag, the free end of the second fabric piece is then sleeved on the gas generator bolt to further compress the gas bag.

[0027] The above features describe how the two fabric pieces are secured to the airbag. Ideally, the four bolts of the gas generator are fitted onto the first fabric piece, while the second fabric piece is only secured to two bolts. This prevents the second fabric piece from wrinkling during tightening. However, if only two bolts are fitted onto the second fabric piece, excessive stress at the base during airbag deployment could cause tearing. Alternatively, a four-bolt mounting surface could be designed on the second fabric piece. Furthermore, if necessary, the first and second fabric pieces can be designed with additional free ends for further shaping after the two fabric pieces have tightly wrapped the folded airbag.

[0028] Preferably, on both sides of the long opening of the first fabric piece, a second weak seam is provided in the X direction, which penetrates the second fabric piece.

[0029] Preferably, the second weak suture may be collinear with the first weak suture.

[0030] These two features are designed to prevent the long strip opening from failing to apply force to the first tear line. Generally, if the long strip opening is functional, these weak seams can serve as fixing lines for the first and second fabric pieces. To reduce costs, this solution uses weak seams instead of strong seams because these two seams can break, and generally become a further source of force only when the long strip opening fails to apply force to the first tear line.

[0031] Preferably, the burstable shape of the airbag wrapping fabric is similar to the shape of the tear line of the dashboard cover. The first tear line of the first fabric piece is set in the X direction, and the long strip opening is set in the Y direction. The tearable line of the dashboard and the first tearable line form an intersecting projection or are opened in different directions. The center of the tearable line of the dashboard is set in the Y direction, and the two sides are set in the X direction to form an H-shaped tearable line.

[0032] Preferably, the tearable line of the instrument panel forms a 90-degree cross projection with the burstable shape of the first fabric piece.

[0033] Preferably, the tearable line of the instrument panel forms a cross projection of 70-110 degrees with the burstable shape of the first fabric piece.

[0034] The above features are due to the alignment design of the tear lines. Because the tearing directions of the instrument panel, the first fabric piece, and the second fabric piece are mismatched when the airbag deploys, the airbag deployment will be stuck. The X-direction covering of the instrument panel airbag frame must be set on the second fabric piece because the folded part is very long and the edge width of the X-direction airbag frame is wide. If it is set on the first fabric piece, the force will be applied too late, causing the fabric piece and the airbag to shake more when deployed. When the folded part is set on the second fabric piece, the folded part is supported by the deployed airbag. The entire process from start-up to the tearing of the second tear line is restricted by the first fabric piece, and the posture is quite stable. When the second tear line is about to tear, it is also buffered by the long opening until the second tear line is completely torn. At the same time, the first tear line of the first fabric piece is also torn quickly due to the force. The four openings stably cover the four edges of the instrument panel airbag frame.

[0035] It should be noted that the X direction refers to the front-to-back direction of the vehicle, the Y direction refers to the left-to-right direction of the vehicle, and the Z direction refers to the up-and-down direction of the vehicle.

[0036] Compared with the prior art, the present invention has at least the following technical effects: 1. The wrapping cloth is mainly used to prevent the folded airbag from loosening. In this design, the Z-shaped fold layer is on the inside, making it less likely to unravel during transportation and ensuring better integrity. Existing technologies generally have the fold layer on the outside, which makes it easier for the fold layer to loosen because the fixing seams of the fold layer are weak seams.

[0037] 2. The outer layer of the fabric in this design is a single-layer, single-sided design, which allows the overall wrapping fabric to be wrapped more tightly. There will be no slippage or loosening between the folded fabric pieces. If the folded part is on the outer layer, it may be necessary to increase the stitching of the folded part. Moreover, these stitches are weak stitches, and more stitching may affect the unfolding speed or cause the unfolding to get stuck. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 : Schematic diagram of an existing instrument panel airbag cover with crack lines; Figure 2 : A schematic diagram of the first fabric piece laid flat in an airbag wrapping fabric according to an embodiment of the present invention; Figure 3 : A schematic diagram of the second fabric piece laid flat in an airbag wrapping fabric according to an embodiment of the present invention; Figure 4 : A schematic diagram of the second fabric fold in an airbag wrapping fabric according to an embodiment of the present invention; Figure 5 A schematic diagram of the flat-laying fabric assembly in an airbag wrapping fabric according to an embodiment of the present invention; Figure 6 : A cross-sectional view of the wrapping cloth assembly in an airbag wrapping cloth according to an embodiment of the present invention.

[0040] The reference numerals in the drawings of this invention are as follows: 1. Instrument panel tear line; 2. First fabric piece; 3. First tear line; 4. Long strip opening; 5. End; 6. Second fabric piece; 7. Second tear line; 8. Fold; 9. Bending extension; 10. Notch; 11. Width limiting hole; 12. Gas generator fixing part of the first fabric piece; 13. Free end of the first fabric piece; 14. Gas generator mounting opening; 15. Side bolt fixing part; 16. Gas generator fixing part of the second fabric piece; 17. Free end of the second fabric piece; 18. First weak seam; 19. Resistance point; 20. Second weak seam. Detailed Implementation

[0041] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0042] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0044] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0045] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0046] The present invention will now be described in detail with reference to the accompanying drawings. Figure 1 The diagram shows a conventional passenger-side dashboard for a car. The airbag door rupture line 1 on the dashboard is H-shaped, with one line in the Y direction and two lines in the X direction distributed on both sides of the line in the Y direction. In the event of a car collision, the airbag will push open the rupture line 1 from inside the dashboard and deploy between the occupant and the dashboard to protect the occupant.

[0047] Figure 2The first piece of fabric 2, which is the wrapping fabric of this solution, forms a burstable shape through the first tear line 3 in the middle and the long strip openings 4 on both sides. When the airbag is deployed, it first protrudes from the weakest long strip opening 4, and then uses the force generated by the two bending inflection points of the long strip opening to form a Y-direction pulling force. The bending ends of the two long strip openings 4 come together to form a stress concentration area. At the same time, the airbag during the deployment process gives the first piece of fabric 2 a Z-direction supporting force, so that the first weakening line 3 of the first piece of fabric 2 breaks quickly and accurately.

[0048] The length of the first tear line 3 is determined by the distance L between the two long openings 4, and a cross-shaped burst shape is provided at the intersection 5 of the first tear line 3 and the long openings 4, because the cross-shaped rupture is more stable than the long opening rupture mode.

[0049] Figure 3 and Figure 4 The second fabric piece 6, which is used to wrap the fabric of this solution, forms an openable cover by a flip axis formed by the second tear line 7 and the notches 10 on both sides. The deployed airbag is exposed from the second tear line 7. The second fabric piece 6 is provided with a folded part 8 with multiple folds. In order to cover the X-direction edge of the two covers on the dashboard tear line 1 and prevent the airbag from being punctured, since the airbag is deployed towards the occupant side, that is, in the opposite direction of the gas generator fixing part 16, the length A of the first cover is longer than the length B of the second cover. This length difference is a safety margin reserved for the coverage of the airbag on the dashboard.

[0050] Figure 4 The width l of the folding part 8 is shown. This width l is the main force-bearing area supporting the second fabric piece 6 when the airbag is deployed. It cannot be too wide, otherwise it will affect the deployment speed. This width l is controlled by continuously setting the width limiting hole 11 during folding, and finally forming the folding part 8. The number of folds is determined by the fact that the spatial projections of the two bolt fixing parts 16 and 17 do not overlap from the first fold, and overlap with the spatial projections of the two corresponding fixing parts 12 and 13 of the first fabric piece 2.

[0051] Figure 5 The assembly of the wrapping fabric is shown. After the first fabric piece 2 and the second fabric piece 6 overlap, they need to be secured with stitching. In addition to the strong stitching on both the gas generator fixing parts 12 and 16, four weak stitches 18 parallel to the long strip opening 4 are added. Among them, the weak stitches located on the folding part 8 can be used as a dual-purpose stitch for both securing the two fabric pieces and shaping the folding part 8. Figure 6 The second weak suture 20 and the first weak suture 18 can be used in two ways.

[0052] It needs to be clarified that: the X direction refers to the front-to-back direction of the vehicle, the Y direction refers to the left-to-right direction of the vehicle, and the Z direction refers to the up-and-down direction of the vehicle.

[0053] A wrapping cloth is used for an airbag device covered by a dashboard door cover. The airbag device includes components such as a folded airbag bag and a gas generator. The airbag wrapping cloth includes a first cloth piece 2. The first cloth piece 2 has a first tear line 3 to form a burstable shape for the airbag wrapping cloth. An elongated opening 4 is also provided at the end 5 of the first tear line 3 to cooperate in applying force to the first cloth piece 2 when the airbag is deployed, so that the first tear line 3 breaks more stably and quickly.

[0054] The length of the elongated opening 4 is longer than the length of the first tear line 3, and the length of the elongated opening 4 can cover at least 90% of the width of the instrument panel tearable line 1 in the Y direction.

[0055] The long opening 4 of the first fabric piece 2 extends across the end 5 of the first tear line 3, and intersects with or forms a cross-shaped cut with the end 5 of the first tear line 3.

[0056] The elongated opening 4 can be two, and the two elongated openings have a middle section and a bent extension section. The length of the first tear line 3 is limited by the distance L between the middle sections of the two elongated openings 4. The four ends of the extension sections of the two elongated openings 4 are brought together in pairs to form a stress concentration part. The length of the stress concentration part is shorter than the length of the first tear line 3.

[0057] The airbag wrapping fabric also includes a second fabric piece 6, which has a second tear line 7. The middle area of ​​the second fabric piece 6 forms multiple accordion-like folds in the X direction. After folding, a first weak seam 18 is sewn on the folded area. The second fabric piece 6 is layered below the first fabric piece 2 and above the folded airbag.

[0058] The left and right edges of the airbag frame are covered by two Y-shaped openings formed after the first tear line 3 of the first fabric piece 2 breaks, and the front and rear edges of the airbag frame are covered by two X-shaped openings formed after the second tear line 7 of the second fabric piece 6 breaks.

[0059] The first fabric piece 2 has a long opening 4 with a bent extension section 9. The bent extension section 9 and the non-bent part of the long opening 4 form a bending inflection point. The second fabric piece 6 has a notch 10. The notch 10 is located at the end of the flip axis of the two openings of the second fabric piece 6. When the two openings are extended outward through the first fabric piece 2, the notch 10 resists the bending inflection point 19 of the bent extension section 9 of the long opening 4 of the first fabric piece 2, forming a rigid flip axis for the two openings of the second fabric piece 6 to flip towards the instrument panel airbag frame. At the same time, the design of the notch 9 prevents irregular tearing at the resisting position.

[0060] The width l of each fold of the multi-layer folds on the second fabric piece 2 is determined by fitting each preset width limiting hole 11. The second tear line 7 is one of the folds. After the folding part 8 is completed, the second tear line 7 is attached to the surface of the folded airbag.

[0061] The first opening length A of the second fabric piece 6 is longer than the second opening length B. The first opening of the second fabric piece 6 faces the passenger side, and the second opening of the second fabric piece 6 faces the front of the vehicle. The seam between the two openings is the second tear line 7. The width C of the second fabric piece 6 is less than the length of the long strip opening 4 of the first fabric piece 2. The second tear line 7 and the first tear line 3 are arranged in a cross projection.

[0062] On the first fabric piece 2, there is a gas generator fixing part 12. The fixing part 12 is sewn onto the air bag and is used to fasten it to a gas generator with bolts or a fixing device with bolts. The first fabric piece 2 also has a plurality of free ends 13. After the wrapping cloth wraps the folded air bag, the free ends 13 are sleeved on the bolts to wrap the folded air bag tightly.

[0063] A gas generator mounting opening 14 is provided at the gas generator fixing part 12 of the first cloth piece 2.

[0064] The free end 13 of the first cloth piece 2 may also be a bolt fixing part symmetrically arranged on both sides. After the gas generator fixing part 12 and the front free end 13 of the first cloth piece 2 are wrapped tightly around the folded bag, the two symmetrically arranged side bolt fixing parts are further fitted onto the bolts to make the folded bag more compact.

[0065] The second fabric piece 6 is provided with at least one gas generator fixing part 16 and at least one free end 17. The gas generator fixing part 16 of the second fabric piece 6 is sewn onto the gas bag and fastened to the gas generator bolt or the fixing part with bolt. After the second fabric piece 6 wraps the folded bag, the free end 17 of the second fabric piece 6 is then sleeved on the gas generator bolt to further compress the gas bag.

[0066] On both sides of the long opening 4 of the first fabric piece 2, a second weak seam 20 is provided in the X direction, which penetrates the second fabric piece.

[0067] The second weak suture 20 may be collinear with the first weak suture 18.

[0068] The burstable shape of the airbag wrapping fabric is similar to the shape of the tear line 1 of the dashboard cover. The first tear line 3 of the first fabric piece 2 is set in the X direction, and the long strip opening 4 is set in the Y direction. The tearable line 1 of the dashboard and the first tearable line 3 form an intersecting projection or are opened in different directions. The center of the tearable line 1 of the dashboard is set in the Y direction, and the two sides are set in the X direction to form an H-shaped tearable line.

[0069] The instrument panel's crackable line 1 and the first fabric piece 2's burstable shape form a 90-degree cross projection.

[0070] The instrument panel's crackable line 1 and the burstable shape of the first fabric piece 2 form a cross projection of 70-110 degrees.

[0071] In this specification, the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for the product embodiments described later, since they correspond to the methods, the descriptions are relatively simple, and the relevant parts can be referred to the descriptions in the system embodiments.

[0072] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An airbag wrapping fabric, applied to an airbag device covered by a dashboard door cover, the airbag device including a folded airbag bag, a gas generator, and other components, the airbag wrapping fabric including a first fabric piece, the first fabric piece having a first tear line forming a burstable shape for the airbag wrapping fabric, characterized in that, An elongated opening is provided at the end of the first tear line to help apply force to the first fabric piece when the airbag is deployed, so that the first tear line breaks more stably and quickly.

2. The airbag wrapping fabric according to claim 1, characterized in that, The length of the elongated opening is longer than the length of the first tear line, and the length of the elongated opening can cover at least 90% of the width of the instrument panel tear line in the Y direction.

3. The airbag wrapping fabric according to claim 1, characterized in that, The long opening of the first piece of fabric extends across the end of the first tear line and has a cross cut or a cross-shaped cut with the end of the first tear line.

4. The airbag wrapping fabric according to claim 1, characterized in that, The elongated opening can be two, and the two elongated openings have a middle section and a bent extension section. The length of the first tear line is limited by the distance L between the middle sections of the two elongated openings. The four ends of the extension sections of the two elongated openings are brought together in pairs to form a stress concentration part. The length of the stress concentration part is shorter than the length of the first tear line.

5. The airbag wrapping fabric according to claim 1, characterized in that, The airbag wrapping fabric also includes a second fabric piece, which has a second tear line. The middle area of ​​the second fabric piece forms multiple accordion-like folds in the X direction. After folding, a first weak seam is sewn on the folded area. The second fabric piece is layered below the first fabric piece and above the folded airbag.

6. The airbag wrapping fabric according to claim 5, characterized in that, The left and right edges of the airbag frame are covered by two Y-shaped openings formed after the first tear line of the first fabric piece breaks, and the front and rear edges of the airbag frame are covered by two X-shaped openings formed after the second tear line of the second fabric piece breaks.

7. The airbag wrapping fabric according to claim 5, characterized in that, The first fabric piece has a long strip opening with a bent extension section, which forms a bending inflection point with the non-bent portion of the long strip opening. The second fabric piece has a notch located at the end of the flip axis of the two openings of the second fabric piece. When the two openings extend outward through the first fabric piece, the notch resists the bending inflection point of the bent extension section of the long strip opening of the first fabric piece, forming a rigid flip axis for the two openings of the second fabric piece to flip towards the instrument panel airbag frame. At the same time, the design of the notch prevents irregular tearing at the resisting position.

8. The airbag wrapping fabric according to claim 5, characterized in that, The width of each fold of the multi-layered folds on the second fabric piece is determined by fitting each preset width-limiting hole. The second tear line is one of the folds. After the folding is completed, the second tear line is attached to the surface of the folded airbag.

9. The airbag wrapping fabric according to claim 6, characterized in that, The first opening length A of the second fabric piece is longer than the second opening length B. The first opening of the second fabric piece faces the passenger side, and the second opening of the second fabric piece faces the front of the vehicle. The seam between the two openings is the second tear line. The width C of the second fabric piece is less than the length of the long opening of the first fabric piece. The second tear line and the first tear line are arranged in a cross projection.

10. The airbag wrapping fabric according to claim 1, characterized in that, On the first piece of fabric, there is a gas generator fixing part, which is sewn onto the airbag and used to fasten to the gas generator with bolts or the fixing device with bolts. The first piece of fabric also has multiple free ends, which are sleeved on the bolts after the wrapping fabric wraps the folded airbag and tightens the folded airbag.

11. The airbag wrapping fabric according to claim 10, characterized in that, A gas generator mounting opening is provided at the gas generator fixing part of the first fabric piece.

12. The airbag wrapping fabric according to claim 10, characterized in that, The free end of the first fabric piece may also have bolt fixing parts symmetrically arranged on both sides. After the gas generator fixing part and the free end of the front of the first fabric piece are wrapped tightly with the folded bag, the two symmetrical bolt fixing parts on both sides are further fitted onto the bolts to make the folded bag more compact.

13. The airbag wrapping fabric according to claim 5, characterized in that, The second fabric piece has at least one gas generator fixing part and at least one free end. The gas generator fixing part of the second fabric piece is sewn onto the gas bag and fastened to the gas generator bolt or the fixing part with bolts. After the second fabric piece wraps the folded bag, the free end of the second fabric piece is then sleeved on the gas generator bolt, so that the gas bag is further compressed.

14. The airbag wrapping fabric according to claim 5, characterized in that, On both sides of the long opening of the first fabric piece, a second weak seam is provided in the X direction, which penetrates the second fabric piece.

15. The airbag wrapping fabric according to claim 14, characterized in that, The second weak suture may be collinear with the first weak suture.

16. The airbag wrapping fabric according to claim 1, characterized in that, The burstable shape of the airbag wrapping fabric is similar to the shape of the tear line of the dashboard cover. The first tear line of the first fabric piece is set in the X direction, and the long strip opening is set in the Y direction. The tearable line of the dashboard and the first tear line form an intersecting projection or are opened in different directions. The center of the tearable line of the dashboard is set in the Y direction, and the two sides are set in the X direction to form an H-shaped tearable line.

17. The airbag wrapping fabric according to claim 16, characterized in that, The tearable line of the instrument panel forms a 90-degree cross projection with the burstable shape of the first piece of fabric.

18. The airbag wrapping fabric according to claim 16, characterized in that, The tearable line of the instrument panel forms a cross projection of 70-110 degrees with the burstable shape of the first piece of fabric.

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