Airbag

Abstract

An airbag includes a gas generator and an airbag body connected to the gas generator. The airbag body has a wound state in which the airbag body is wound into a roll and an unfolded state in which the airbag body is unfolded. The airbag further includes a pull strap fixed to an outer surface of an outermost airbag of the airbag body in the wound state at a fixing portion. The pull strap has a first end opposite to the fixing portion, and is arranged such that the pull strap can be pulled in a first direction and move the outermost airbag of the airbag body in the first direction and fix the first end with respect to the gas generator. The present disclosure can well control the overall size of the airbag in the wound state, and is simple to manufacture and low in cost.

Description

Technical Field

[0001] This disclosure generally relates to an airbag. In particular, this disclosure relates to a rollable airbag. Background Technology

[0002] Airbags are widely used in vehicles and other fields to protect occupants from injury in the event of a collision. There exists a type of airbag that can be rolled up and stored. For example... Figure 1 and Figure 2 As schematically shown, the airbag includes a gas generator 60 and an airbag body 10. A fixing stud 50 is provided on the gas generator 60. One end of the airbag body 10 is fixed to the gas generator 60. The airbag body 10 has a wound state and an deployed state. In the wound state, the airbag body is wound into a roll; in the deployed state, the roll of the airbag body is unfolded.

[0003] It is desirable that the size of the airbag in the coiled state be controlled to be as small as possible. For example... Figure 1 and Figure 2 As illustrated, one method for controlling the size of an airbag is to use a soft cover 30. First, one end of the soft cover 30 is fixed to the fixing stud 50. Then, the soft cover 30 is pulled around the outer periphery of the airbag body 10. Finally, the other end of the soft cover 30 is fixed to the fixing stud 50. While this design can constrain the size of the airbag to some extent, when the soft cover 30 is pulled taut and the other end is fixed to the fixing stud 50, the soft cover will create friction along the airbag body. Figure 2 The compressive force in the direction indicated by the middle arrow A causes the airbag body to... Figure 2 It expands in the direction indicated by arrow B. Therefore, the soft cover 30 cannot effectively control the size of the rolled-up airbag.

[0004] Another way to control the size of airbags is to use a heat-fixed cover. While heat-fixed covers can better package airbags, they are expensive and complex to manufacture.

[0005] Therefore, there is a need for an improved airbag that can effectively control the size of the airbag when it is in a coiled state, while being simple to manufacture and inexpensive. Utility Model Content

[0006] The purpose of this disclosure is to address at least one of the problems existing in the prior art airbag modules described above. One object of this disclosure is to provide an improved airbag that allows control over the size of the airbag in its coiled state. Another object of this disclosure is to provide an improved airbag that is simple to manufacture, has low cost, and allows for a reduction in the size of the airbag in its coiled state.

[0007] In one aspect, this disclosure provides an airbag comprising a gas generator and an airbag body connected to the gas generator. The airbag body has a wound state and a deployed state. The airbag further includes a pull strap fixed at a fixing portion to the outer surface of the outermost airbag layer of the airbag body in the wound state. The pull strap has a first end opposite the fixing portion, and the pull strap is configured such that it can be pulled along a first direction, causing the outermost airbag layer of the airbag body to move along the first direction and fixing the first end relative to the gas generator.

[0008] In one configuration, the gas generator is provided with a fixing stud, and the first end of the pull strap is fixed to the fixing stud.

[0009] In one configuration, the fixing part is a stitched part, and the pull strap is fixed at the stitched part to the outer surface of the outermost airbag by a suture.

[0010] In one configuration, the zipper has a folded-back portion at the seam.

[0011] In one configuration, the zipper strap is sewn together with the reinforcing fabric of the airbag body.

[0012] In one configuration, in the initial state where the pull strap is not pulled, the fixing part is located downstream of the central axis of the fixing stud in the first direction.

[0013] In one configuration, in the initial state where the pull strap is not pulled, the position of the fixing part is such that the angle between the tangent of the outermost airbag of the airbag body in the coiled state at the fixing part and the central axis of the fixing stud is 10° to 80°.

[0014] In one configuration, the included angle is 45°.

[0015] In one configuration, the first end of the pull strap has a first stud fixing hole, the first end is fixed to the fixing stud through the first stud fixing hole, and a first distance between the fixing part and the first stud fixing hole is less than a second distance between the fixing part and the fixing stud in the first direction, wherein the first distance is the distance between the fixing part and the first stud fixing hole in the extension direction of the pull strap extending from the fixing part to the first end when the pull strap is in its naturally extended state, and the second distance is the distance from the fixing part to the fixing stud in a first imaginary path from the fixing part along the first direction around the airbag to the fixing stud in the initial state when the pull strap is not pulled.

[0016] In one configuration, the pull strap further includes a second end opposite to the first end, the second end being configured to be secured to the retaining stud in a second direction opposite to the first direction.

[0017] In one configuration, the pull strap is configured such that when the pull strap is pulled along the first direction with the second end secured to the fixing stud, the section of the pull strap from the fixing portion to the second end is taut.

[0018] In one configuration, the second end of the pull strap has a second stud fixing hole, the second end is fixed to the fixing stud through the second stud fixing hole, and a third distance between the fixing part and the second stud fixing hole is less than a fourth distance between the fixing part and the fixing stud in the second direction, wherein the third distance is the distance between the fixing part and the second stud fixing hole in the extension direction of the pull strap extending from the fixing part to the second end when the pull strap is in its naturally extended state, and the fourth distance is the distance from the fixing part to the fixing stud in a second imaginary path from the fixing part along the second direction around the airbag to the fixing stud in the initial state when the pull strap is not pulled.

[0019] In one configuration, the central axis of the fixing stud is offset from the winding center of the airbag body, and the winding center of the airbag body is located downstream of the central axis of the fixing stud in the first direction.

[0020] In one configuration, the first direction is the winding direction in which the airbag body is rolled up tightly.

[0021] In one configuration, the traction band is an elastic band.

[0022] Since the pull strap is fixed to the outer surface of the outermost airbag of the airbag body in the coiled state, the outermost airbag of the airbag body will move when the pull strap is pulled. Therefore, this disclosure can achieve the beneficial effect of reducing the overall size of the coiled airbag in a simple and low-cost manner.

[0023] It should be noted that aspects of this disclosure described with respect to one embodiment or clause may be included in other different embodiments or clauses, although no specific description is given of said other different embodiments or clauses. In other words, all embodiments or clauses and / or features of any embodiment or clause may be combined in any manner and / or combination, as long as they do not contradict each other. Attached Figure Description

[0024] A better understanding of the various aspects of this disclosure and its advantages will be achieved by reading the following detailed description in conjunction with the accompanying drawings. In the drawings:

[0025] Figure 1 This is a schematic 3D diagram of an airbag based on related technologies.

[0026] Figure 2 yes Figure 1 The diagram shows a schematic cross-sectional view of an airbag.

[0027] Figure 3 This is a schematic perspective view of an airbag according to an embodiment of the present disclosure.

[0028] Figure 4 yes Figure 3 The diagram shows a schematic cross-sectional view of an airbag.

[0029] Figure 5 yes Figure 3 The diagram shows a schematic plan view of the airbag body in the deployed state.

[0030] Figure 6 It is along Figure 5 A schematic cross-sectional view taken from the middle II line.

[0031] Figure 7 yes Figure 6 A schematic diagram of a variant example.

[0032] Figure 8 This is a schematic perspective view of an airbag according to another embodiment of the present disclosure.

[0033] Figure 9 yes Figure 8 The diagram shows a schematic plan view of the airbag body in the deployed state.

[0034] Figure 10It is along Figure 9 A schematic cross-sectional view taken from line II-II.

[0035] It should be understood that in all the accompanying drawings, the same or similar elements will be represented by the same or similar reference numerals. In the drawings, for clarity, the dimensions of some features may be altered and not drawn to scale. Detailed Implementation

[0036] The present disclosure will now be described with reference to the accompanying drawings, which illustrate several embodiments of the present disclosure. However, it should be understood that the present disclosure can be presented in many different ways and is not limited to the embodiments described below; in fact, the embodiments described below are intended to make the disclosure more complete and to fully illustrate the scope of protection of the present disclosure to those skilled in the art. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide further additional embodiments.

[0037] It should be understood that the expressions used in this specification are for describing exemplary embodiments of this disclosure and are not intended to limit this disclosure. All terms used herein, unless otherwise defined, have the meanings commonly understood by those skilled in the art. For the sake of brevity and / or clarity, well-known functions or structures may not be described in detail.

[0038] The terms “the” and “the” used herein, unless explicitly stated otherwise, include the plural form. The expressions “comprising,” “including,” and “having,” and their derivatives, as used herein, indicate the presence of the claimed feature but do not exclude the presence of one or more other features. The expression “and / or” as used herein includes any and all combinations of one or more of the related listed items.

[0039] In this document, without departing from the teachings of this disclosure, the terms “fixed” or “connected” to another element, or “fixed” or “connected” to another element, or similar expressions, shall be understood to mean that an element is directly fixed or connected to another element or indirectly fixed or connected through another element.

[0040] In this document, the terms "first," "second," "third," etc., are used for ease of explanation only and are not intended to refer to any particular order or sequence. Any technical feature represented by "first," "second," "third," etc., is interchangeable.

[0041] In this document, spatial relationship descriptions such as "up," "down," "front," "back," "top," "bottom," "left," and "right" are used to describe the relationship between one feature and another in the accompanying drawings. It should be understood that spatial relationship descriptions include not only the orientation shown in the drawings but also different orientations of the device during use or operation. For example, when the device in the drawings is inverted, a feature previously described as "below" other features can now be described as "above" other features. The device can also be oriented in other ways (rotated 90 degrees or in other orientations), in which case the relative spatial relationships will be interpreted accordingly.

[0042] It should be understood that the terms “internal” and “external” used in this article refer to the interior of the airbag module in its assembled state.

[0043] All figures used in the specification and claims should be understood to be modified by the term "about" in all cases. "About" means within 25 percent of the value, such as 10 percent, 5 percent, etc. Furthermore, unless otherwise specified, all numerical ranges also include the maximum and minimum values, as well as all possible intermediate ranges.

[0044] Figures 3 to 7 An airbag according to one embodiment of the present disclosure is schematically illustrated. Figures 8 to 10 An airbag according to another embodiment of the present disclosure is schematically illustrated. The common features of the airbags of the two embodiments according to the present disclosure will be described below with reference to the accompanying drawings.

[0045] The airbags according to this disclosure can be used in vehicles, for example, to inflate and protect occupants in the event of a collision. The airbag is particularly a roll-up airbag. The airbag can be, for example, a side airbag. However, it should be understood that the airbags of this disclosure are also applicable to any other type of airbag module, including but not limited to driver's airbags, curtain airbags, knee airbags, etc.

[0046] like Figures 3 to 10 As shown, the airbag includes a gas generator 6 and an airbag body 1 connected to the gas generator 6.

[0047] The gas generator 6 is used to inflate the airbag body. The gas generator 6 may be provided with at least one fixing stud 5. In embodiments of this disclosure, the number of fixing studs 5 is two. However, it should be understood that the number of fixing studs 5 is not limited to this, and it can be any suitable number, one or more.

[0048] The airbag body 1 is configured to inflate and deploy upon impact to protect the occupant from injury. The airbag body 1 is connected to the gas generator 6 to receive gas from the gas generator 6 at appropriate times.

[0049] The airbag body 1 has a wound state where it is rolled up and an unfolded state where the roll is unrolled. In this disclosure, the winding direction along which the airbag body 1 is rolled up can be referred to as the first direction U. The direction opposite to the first direction is referred to as the second direction V. The first direction U is in Figure 4 and Figure 8 The middle direction is counterclockwise, as indicated by arrow U.

[0050] like Figures 3 to 7 as well as Figures 8 to 10 As shown, the airbag of this disclosure also includes a pull strap 3. The pull strap 3 is used to control the size of the airbag in the coiled state. The pull strap 3 is fixed to the airbag body 1 at the fixing part 2. Specifically, the pull strap 3 is fixed in such a position that, when the airbag body is in the coiled state, the fixing part 2 is located on the outer surface of the outermost airbag 11 of the airbag body 1.

[0051] The pull strap 3 has a first end 31 opposite to the fixing part 2. The pull strap 3 is configured such that it can be pulled along the first direction U. Since the pull strap 3 is fixed to the outermost airbag 11 of the airbag body 1, the movement of the pull strap will cause the outermost airbag 11 of the airbag body 1 to move along the first direction U. The first end 31 is fixed relative to the gas generator 6. The first end 31 can be fixed to the fixing stud 5.

[0052] Since the first end 31 of the pull strap 3 is fixed relative to the gas generator 6, the outermost airbag 11 of the airbag body 1 has moved a certain distance in the first direction U relative to its initial position before the pull strap 3 moved. Therefore, the circumference of the outermost airbag 11 of the airbag body becomes smaller, and the outermost airbag 11 and the pull strap 3 will exert a force on the airbag body 1 such as Figure 4 and Figure 8 The compressive force indicated by the middle arrow F reduces the size of the airbag in both the direction of the central axis Z of the fixing stud 5 and the X direction perpendicular to the central axis Z, thereby effectively reducing the overall size of the airbag in its coiled state. Furthermore, this disclosure only requires simple fixing of the pull strap 3 to the airbag body, thus simplifying manufacturing and reducing costs.

[0053] The pull strap 3 of the airbag disclosed herein not only serves as a restraint strap, but is also fixed to the outer surface of the outermost airbag 11 of the airbag body in a coiled state. The movement of the pull strap can drive the outermost airbag to move, so it can not only reduce the size in the direction of the central axis Z of the fixing stud 5, but also reduce the size in the X direction perpendicular to the central axis Z.

[0054] The fixing part 2 can be a suture part. The pull strap is fixed to the outer surface of the outermost airbag 11 at the suture part by stitches. This method of fixing is simple and low-cost. Figure 5 and Figure 9 As illustrated schematically, this only requires sewing the strap 3 to a predetermined, suitable position on the fabric piece of the airbag body 1 during manufacturing. For example... Figure 6 , Figure 7 and Figure 10 As illustrated schematically, the pull strap 3 and the reinforcing fabric 7 can be sewn onto the airbag body 1 simultaneously using the same thread when sewing the reinforcing fabric 7. This eliminates the need for a separate step in securing the pull strap, thus further simplifying manufacturing and reducing costs.

[0055] It is understood that the pull strap 3 can also be fixed to the outer surface of the outermost airbag by means other than sewing, including but not limited to adhesive, heat fusion, etc.

[0056] like Figure 4 and Figure 8 As shown, in the initial state where the pull strap 3 is not pulled, the fixing part 2 is located downstream of the central axis Z of the fixing stud 5 in the first direction U. That is, in Figure 4 and Figure 8 Viewed in the cross-section shown, the fixing part 2 is located to the right of the central axis Z of the fixing stud 5. The fixing part 2, positioned as described above, allows for better control of the overall size of the airbag by pulling the strap 3.

[0057] In one configuration, in the initial state where the pull strap 3 is not pulled, assuming the tangent S of the outermost airbag 11 of the airbag body 1 in the wound state at the fixing part 2, and the angle α between the central axis Z of the fixing stud 5 and the tangent S, the angle α can optionally be 10° to 80°, more preferably 20° to 70°, even more preferably 30° to 60°, even more preferably 40° to 50°, and even more preferably approximately 45°. The fixing part 2 being located within the aforementioned angle range allows for more advantageous control of the airbag size. In particular, an angle α of approximately 45° allows for better pulling of the outermost airbag, thereby compressing the airbag body 1.

[0058] like Figure 5 and Figure 9 As shown, the first end 31 of the pull strap 3 may have a first stud fixing hole 41. The number of first stud fixing holes 41 matches the number of fixing studs 5. The first end 31 is fixed to the fixing studs 5 through the first stud fixing holes 41. This allows for stable control of the airbag size.

[0059] In this document, the distance between the fixing part 2 and the first stud fixing hole 41 is defined as: the distance between the fixing part 2 and the first stud fixing hole 41 in the extending direction of the pull strap 3 extending from the fixing part 2 towards the first end 31 when the pull strap is in its naturally extended state, and this distance is referred to herein as the first distance L1, as follows. Figure 5 and Figure 9 As shown. The distance between the fixing part 2 and the fixing stud 5 in the first direction U is defined as: in the initial state where the pull strap 3 is not pulled, the distance along the first imaginary path from the fixing part 2 to the fixing stud 5 in the first direction U around the airbag (e.g., ...). Figure 4 and Figure 8 In the path schematically shown by the dashed line P, the distance from the fixing part 2 to the fixing stud 5 is referred to herein as the second distance L2. The first distance L1 can be set to be less than the second distance L2. Thus, when the first end 31 of the pull strap 3 is fixed to the fixing stud 5 through the first stud fixing hole 41, the fixing part 2 drives the outermost airbag 11 of the airbag body 1 to move a certain distance along the first direction U relative to the initial position before pulling, thereby better controlling the size of the airbag.

[0060] In addition, such as Figure 4 and Figure 8 As shown, the central axis Z of the fixing stud 5 and the winding center O of the airbag body 1 can be set to be offset from each other. The winding center O of the airbag body can be located downstream of the central axis Z of the fixing stud in the first direction. That is, in Figure 4 and Figure 8 In the cross-sectional view shown, the winding center O of the airbag body can be located to the right of the central axis Z of the fixing stud. This eccentric state allows for more stable compression of the airbag body 1 after the strap 3 is fixed, thus better achieving the effect of reducing the size of the airbag.

[0061] The pull strap 3 can be an elastic band with a certain degree of elasticity. The pull strap 3 can be made of soft fabric. The pull strap 3 can be selected from materials such as polypropylene, thermoplastic elastomer (TPE), nylon, or polyurethane elastic fibers, or any combination thereof. It is understood that the pull strap 3 can also be made of any other suitable material. Using an elastic band as the pull strap allows for better restraint of the airbag's size and facilitates the fixing of the pull strap 3 to the fixing stud through the stud fixing holes.

[0062] The following continues to refer to... Figures 3 to 7 A first embodiment of the airbag according to this disclosure will be further described. The technical features and combinations thereof described above can be applied to this embodiment, and therefore will not be repeated here.

[0063] In this embodiment, as Figure 3 and Figure 4 As shown, the pull strap 3 is provided on one side relative to the fixing part 2. That is, the pull strap 3 extends from the fixing part 2, extends only along the first direction U, and is fixed to the fixing stud 5 by being pulled. Since the movement of the pull strap 3 causes the outermost airbag 11 of the airbag body 1 to move along the first direction U, the overall size of the airbag can be effectively reduced. In addition, since the pull strap only needs to be arranged on one side, the solution of this embodiment further simplifies the structure and reduces costs.

[0064] As a variation of this embodiment, such as Figure 7 As schematically shown, the pull strap 3 may have a fold-back portion 21 at the suture. The fold-back portion 21 can be achieved by folding the pull strap 3 back at the suture to form a double-layer structure. The pull strap 3 can be sewn to the airbag body 1 at the double-layer structure. This prevents the edge material from being in a free state.

[0065] The following continues to refer to... Figures 8 to 10 A second embodiment of the airbag according to this disclosure will be further described. The foregoing technical features and combinations thereof can be applied to this embodiment, and therefore will not be repeated here.

[0066] In this embodiment, as Figure 8 and Figure 9 As shown, the pull strap 3 extends in two directions relative to the fixing part 2. In this document, the portion of the pull strap 3 located downstream of the fixing part 2 in the first direction U is referred to as the first section of the pull strap 2, and the portion of the pull strap 3 located upstream of the fixing part 2 in the first direction U is referred to as the second section of the pull strap 2.

[0067] The pull strap 3 has a first end 31 in the first section. The pull strap has a second end 32 in the second section, opposite to the first end 31. The second end 32 is configured to be secured to the fixing stud 5 in a second direction V opposite to the first direction U. Both ends of the pull strap 3 are secured to the fixing stud 5, which is particularly suitable for, for example... Figure 8 The airbag shown has a Z-shaped fold 13, because the second section of the pull strap 3 constrains the airbag body 1, preventing the Z-shaped fold 13 from loosening and unfolding when the pull strap 2 is pulled.

[0068] The second end 32 of the pull strap 3 may have a second stud fixing hole 42. The number of second stud fixing holes 42 matches the number of fixing studs 5. The second end 32 is fixed to the fixing studs 5 through the second stud fixing holes 42.

[0069] In use, for example, the second end 32 of the pull strap 3 can be first fixed to the fixing stud 5 through the second stud fixing hole 42 along the second direction V. After the second end 32 of the pull strap is fixed, the pull strap 3 is then pulled along the first direction U. During this process, the pull strap 3 will drive the outermost airbag 11 of the airbag body 1 to move a certain distance along the first direction U and tighten the second section of the pull strap 3. The first end 31 of the pull strap 3 is fixed to the fixing stud 5 through the first stud fixing hole 41. The tightened second section of the pull strap 3 will restrain the airbag body 1, preventing the Z-shaped fold 13 in the airbag from loosening and unfolding. The movement of the outermost airbag 11 of the airbag body 1 driven by the pull strap 3 along the first direction U will reduce the size of the airbag in both the direction of the central axis Z of the fixing stud 5 and the X direction perpendicular to the central axis Z.

[0070] In this document, the distance between the fixing part 2 and the second stud fixing hole 42 is defined as: the distance between the fixing part 2 and the second stud fixing hole 42 in the extending direction of the pull strap 3 extending from the fixing part 2 to the second end 32 when the pull strap is in its naturally extended state, and this distance is referred to herein as the third distance L3. Figure 9 As shown. The distance between the fixing part 2 and the fixing stud 5 in the second direction V is defined as: in the initial state where the pull strap 3 is not pulled, the distance along the second direction V from the fixing part 2 to the fixing stud 5 via a second hypothetical path (e.g., the path around the airbag to the fixing stud 5). Figure 8The distance from the fixing part 2 to the fixing stud 5 (schematically shown by the dashed line Q) is referred to herein as the fourth distance L4. The third distance L3 can be set to be less than the fourth distance L4. This allows for better restraint of the airbag body 1, preventing its special folds, such as the Z-shaped folds, from loosening and unfolding.

[0071] Exemplary embodiments according to this disclosure have been described above with reference to the accompanying drawings. However, those skilled in the art will understand that various changes and modifications can be made to the exemplary embodiments of this disclosure without departing from the spirit and scope of this disclosure. All changes and modifications are included within the scope of protection of this disclosure as defined by the claims. This disclosure is defined by the appended claims, and equivalents of those claims are also included.

Claims

1. An airbag, the airbag comprising a gas generator and an airbag body connected to the gas generator, the airbag body having a wound state and a deployed state, characterized in that, The airbag also includes a pull strap, which is fixed at a fixing portion to the outer surface of the outermost airbag of the airbag body in the wound state. The pull strap has a first end opposite to the fixing portion. The pull strap is configured such that the pull strap can be pulled in a first direction and drive the outermost airbag of the airbag body to move in the first direction, and the first end is fixed relative to the gas generator.

2. The airbag according to claim 1, characterized in that, The gas generator is provided with a fixing stud, and the first end of the pull strap is fixed to the fixing stud.

3. The airbag according to claim 1, characterized in that, The fixing part is a sewn part, and the pull strap is fixed to the outer surface of the outermost airbag at the sewn part by stitches.

4. The airbag according to claim 3, characterized in that, The zipper has a folded-back section at the seam.

5. The airbag according to claim 3, characterized in that, The zipper strap is sewn together with the reinforcing fabric of the airbag body.

6. The airbag according to claim 2, characterized in that, In the initial state where the pull strap is not pulled, the fixing part is located downstream of the central axis of the fixing stud in the first direction.

7. The airbag according to claim 6, characterized in that, In the initial state where the pull strap is not pulled, the position of the fixing part is such that the angle between the tangent of the outermost airbag of the airbag body in the winding state at the fixing part and the central axis of the fixing stud is 10° to 80°.

8. The airbag according to claim 7, characterized in that, The included angle is 45°.

9. The airbag according to claim 6, characterized in that, The first end of the pull strap has a first stud fixing hole, and the first end is fixed to the fixing stud through the first stud fixing hole. The first distance between the fixing part and the first stud fixing hole is less than the second distance between the fixing part and the fixing stud in the first direction. The first distance is the distance between the fixing part and the first stud fixing hole in the extension direction of the pull strap extending from the fixing part to the first end when the pull strap is in its naturally extended state. The second distance is the distance from the fixing part to the fixing stud in the first imaginary path from the fixing part to the fixing stud along the first direction around the airbag in the initial state when the pull strap is not pulled.

10. The airbag according to claim 2, characterized in that, The pull strap also includes a second end opposite to the first end, the second end being configured to be secured to the fixing stud in a second direction opposite to the first direction.

11. The airbag according to claim 10, characterized in that, The pull strap is configured such that when the pull strap is pulled along the first direction with the second end fixed to the fixing stud, the section of the pull strap from the fixing portion to the second end is taut.

12. The airbag according to claim 11, characterized in that, The second end of the pull strap has a second stud fixing hole, and the second end is fixed to the fixing stud through the second stud fixing hole. The third distance between the fixing part and the second stud fixing hole is less than the fourth distance between the fixing part and the fixing stud in the second direction. The third distance is the distance between the fixing part and the second stud fixing hole in the extension direction of the pull strap extending from the fixing part to the second end when the pull strap is in its naturally extended state. The fourth distance is the distance from the fixing part to the fixing stud in the second imaginary path from the fixing part to the fixing stud along the second direction around the airbag to the fixing stud in the initial state when the pull strap is not pulled.

13. The airbag according to any one of claims 2 to 12, characterized in that, The central axis of the fixing stud is offset from the winding center of the airbag body, and the winding center of the airbag body is located downstream of the central axis of the fixing stud in the first direction.

14. The airbag according to any one of claims 1 to 12, characterized in that, The first direction is the winding direction in which the airbag body is rolled up tightly.

15. The airbag according to any one of claims 1 to 12, characterized in that, The traction belt is an elastic belt.

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