Air curtain structure and safety air curtain

Abstract

The invention discloses an air curtain structure and a safety air curtain, the air curtain structure comprises an air curtain body, a lower convex part is formed by sewing threads at the bottom end of the air curtain body, a middle sewing thread is arranged on one side, close to the front end of the air curtain body, of the lower convex part, and the air curtain body comprises a flow guide sewing thread and a buffer sewing thread. The flow guide sutures comprise first longitudinal sutures and first transverse sutures, the first longitudinal sutures extend and approach from the bottom end sutures of the lower convex parts to the top end sutures of the air curtain body, and first protection cavities are formed between the first longitudinal sutures and the middle sutures; the first transverse suture extends from one end, close to the top suture of the air curtain body, of the first longitudinal suture to the rear end of the air curtain body; the buffering sewing thread is sewn on the air curtain body and located on the side, close to the air curtain body rear end sewing thread, of the flow guiding sewing thread, and the buffering sewing thread and the first transverse sewing thread jointly define a second protection cavity at the rear end of the air curtain body. The first protection cavity and the second protection cavity can be rapidly unfolded, and the problem that an air curtain is unstable due to multi-channel air inflow in the prior art is at least solved.

Description

Technical Field

[0001] The invention relates to the technical field of safety airbags, and in particular to an air curtain structure and a safety air curtain. Background Art

[0002] like Figure 1 As shown, the rear end of the side air curtain is usually designed with multiple longitudinal channels, which are inflated and deployed in sequence to provide protection for the occupants. Figure 2 As shown, in order to cope with small offset collisions (25% offset frontal collision test on the driver or passenger side), a lateral channel (such as a V-shaped channel or a U-shaped channel) is usually provided at the lower edge of the rear end of the existing side airbag to further protect the occupants.

[0003] In the prior art, when multiple longitudinal channels are set at the rear end of the side curtain airbag, the multi-channel design of air intake easily leads to a decrease in stability when the curtain airbag is deployed, thereby affecting the coverage and design of the protection area. At the same time, after a transverse channel is set at the rear end of the side curtain airbag, since the transverse channel is located at the bottom, its air intake deployment speed is slow and the rigidity is insufficient, making it difficult to provide sufficient protection for the occupants in a small offset collision.

[0004] Based on this, a new technical solution is needed. Summary of the invention

[0005] In view of this, an embodiment of the present invention provides an air curtain structure and a safety air curtain to at least solve the problem that the existing air curtain multi-channel air intake leads to reduced stability and the lateral channel of the side air curtain has a slow deployment speed and insufficient rigidity.

[0006] The embodiment of the present invention provides the following technical solutions:

[0007] An embodiment of the present invention provides an air curtain structure, comprising an air curtain body, wherein the bottom end seam of the air curtain body is bent outward to form a lower convex portion, and a longitudinal middle seam is provided on one side of the lower convex portion close to the front end of the air curtain body, and the air curtain body comprises:

[0008] A guide stitch, the guide stitch is sewn on the air curtain body, and includes a first longitudinal stitch and a first transverse stitch, the first longitudinal stitch extends from the bottom stitch of the lower convex portion to the top stitch of the air curtain body, a first protective cavity is formed between the first longitudinal stitch and the middle stitch, and the first transverse stitch extends from one end of the first longitudinal stitch close to the top stitch of the air curtain body to the rear end of the air curtain body;

[0009] A buffer stitch, wherein the buffer stitch is sewn on the air curtain body and is located on a side of the guide stitch close to the rear end stitch of the air curtain body, a buffer cavity with a buffer air inlet is formed between the buffer stitch and the guide stitch, and the buffer stitch and the first transverse stitch jointly define a second protective cavity at the rear end of the air curtain body.

[0010] Furthermore, the connection between the first longitudinal seam and the first transverse seam is located in the air inlet direction of the air inlet of the air curtain body, the first longitudinal seam is used to guide the gas to the first protection cavity, and the first transverse seam is used to guide the gas to the second protection cavity.

[0011] Further, the end of the first transverse seam away from the first longitudinal seam is bent toward the bottom seam of the air curtain body to guide the gas to flow toward the bottom seam of the air curtain body.

[0012] Further, the extension trend of the buffer suture is the same as the extension trend of the diversion suture, and the buffer suture includes a second transverse suture and a second longitudinal suture;

[0013] The second longitudinal stitching line extends from the bottom end stitching line of the lower protrusion to the first transverse stitching line, and the second transverse stitching line extends from the end of the second longitudinal stitching line to the first transverse stitching line close to the rear end stitching line of the air curtain body.

[0014] Furthermore, after the end of the first transverse seam away from the first longitudinal seam is bent toward the bottom seam of the air curtain body, it extends in the direction of the second transverse seam, so that the buffer air inlet is formed between the first transverse seam and the second transverse seam, and the buffer air inlet is arranged toward the bottom seam of the air curtain body.

[0015] Furthermore, it also includes a flower-shaped stitching line, which extends from the rear end stitching line of the air curtain body into the second protection cavity and is used to limit the thickness of the second protection cavity.

[0016] Further, the flower-shaped stitching line extends obliquely upward from the rear end stitching line of the air curtain body and is close to the first transverse stitching line;

[0017] Part of the second protective cavity is formed between the flower-shaped stitching and the first transverse stitching to form a longitudinal cavity for accommodating the head of the occupant.

[0018] Furthermore, the first longitudinal suture is arranged obliquely, so that the first protection cavity is defined as a longitudinal cavity with an inclined angle, so that the first protection cavity can drive the buffer cavity to expand in the transverse and longitudinal directions.

[0019] Furthermore, the middle seam and the bottom seam of the lower convex portion extend to form an n-type structure, and a non-inflatable area is formed in the middle of the air curtain body.

[0020] The present invention also provides a safety air curtain, comprising:

[0021] An air curtain structure as described above;

[0022] An air guide bag is arranged in the side air curtain, and an air outlet of the air guide bag faces the intersection of the first longitudinal seam and the first transverse seam in the side air curtain.

[0023] Compared with the prior art, the at least one technical solution adopted in the embodiment of the present invention can achieve the following beneficial effects:

[0024] An air curtain structure of the present invention can form a longitudinal first protection cavity, a second protection cavity and a buffer cavity at the rear end of the air curtain body by arranging a guide suture and a buffer suture on the bottom end suture of the lower convex part, and the gas can directly enter the first protection cavity and the second protection cavity along the first longitudinal suture and the first transverse suture respectively, so that the first protection cavity and the second protection cavity are quickly deployed, thereby solving the problem of instability of the air curtain caused by multi-channel air intake in the prior art;

[0025] Furthermore, since the first protection cavity is directly extended into the lower convex portion, after the first protection cavity is quickly deployed, it can quickly receive the occupant's head in a small offset collision, and after the first protection cavity is collided, the buffer cavity gradually deploys and can also support the occupant's shoulders. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a structural schematic diagram of an existing multi-channel side air curtain;

[0028] Figure 2 It is a structural schematic diagram of an existing frame-type side air curtain;

[0029] Figure 3 It is a structural schematic diagram of an air curtain structure of the present invention.

[0030] The accompanying drawings of the present invention are as follows:

[0031] 10. Air curtain body; 11. Lower convex part; 12. Middle stitching; 13. Guide stitching; 131. First longitudinal stitching; 132. First transverse stitching; 133. First protection cavity; 14. Buffer stitching; 141. Buffer cavity; 142. Buffer air inlet; 143. Second protection cavity; 144. Second transverse stitching; 145. Second longitudinal stitching; 15. Flower stitching;

[0032] 20. Air bag. DETAILED DESCRIPTION

[0033] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0034] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0035] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an 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 aspect described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0036] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0037] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the examples can be practiced without these specific details.

[0038] like Figure 1 As shown, Figure 1 The rear end of the center side air curtain has multiple longitudinal protection cavities, and each longitudinal protection cavity is provided with an air intake channel. Multi-channel air intake will cause the overall stability of the side air curtain to decrease, which in turn affects the design of the protection area. The folding method of this type of air curtain is to fold the lower end. The larger the inclination angle, the longer the airflow path, which makes it slower for the rear end cavity of the airbag to unfold and fall into place. Therefore, more design margins are needed to compensate for the disadvantages brought about by this unstable air intake.

[0039] like Figure 2 As shown, Figure 2 A frame-type cavity is used in it, that is, the middle is set as a non-inflatable area, and the periphery of the non-inflatable area is set as an inflatable cavity. However, because the peripheral inflatable cavity is relatively thin, it is not rigid enough when unfolded and is prone to getting stuck. It is difficult to effectively protect the occupants when dealing with a small offset collision.

[0040] Based on this, this specification embodiment proposes a processing solution: Figure 3 As shown, an air curtain structure of the present invention directly guides the gas to the first protection cavity 133 and the second protection cavity 143 through the guide suture 13, so that the first protection cavity 133 and the second protection cavity 143 are quickly deployed, and the first protection cavity 133 drives the buffer cavity 141 to quickly deploy to the designated protection area, so as to solve the problem of slow deployment speed of the far end of the existing side air curtain;

[0041] The first protection cavity 133 extends to the lower protrusion 11 and is quickly unfolded, so the lower end of the first protection cavity 133 located at the lower protrusion 11 has a fast unfolding speed, strong rigidity, and no jamming, thereby solving the problems caused by the existing side air curtain frame cavity.

[0042] The technical solutions provided by various embodiments of the present application are described below in conjunction with the accompanying drawings.

[0043] like Figure 3As shown, an air curtain structure provided by the present invention includes an air curtain body 10, the bottom end seam of the air curtain body 10 is bent outward to form a lower convex portion 11, and a longitudinal middle seam 12 is provided on one side of the lower convex portion 11 close to the front end of the air curtain body 10, and the air curtain body 10 includes a guide seam 13 and a buffer seam 14. Among them, the guide stitch 13 is sewn on the air curtain body 10, including a first longitudinal stitch 131 and a first transverse stitch 132. The first longitudinal stitch 131 extends from the bottom stitch of the lower protrusion 11 to the top stitch of the air curtain body 10, and a first protective cavity 133 is formed between the first longitudinal stitch 131 and the middle stitch 12. The first transverse stitch 132 extends from one end of the first longitudinal stitch 131 close to the top stitch of the air curtain body 10 to the rear end of the air curtain body 10; the buffer stitch 14 is sewn on the air curtain body 10 and is located on the side of the guide stitch 13 close to the rear end stitch of the air curtain body 10. A buffer cavity 141 with a buffer air inlet 142 is formed between the buffer stitch 14 and the guide stitch 13, and the buffer stitch 14 and the first transverse stitch 132 jointly define a second protective cavity 143 at the rear end of the air curtain body 10.

[0044] The lower convex portion 11 may be a V-shaped or U-shaped structure, which can form a cavity when inflated to protect the occupants.

[0045] The middle seam line 12 extends from the bottom end of the air curtain body 10 to the top end of the air curtain body 10 .

[0046] The top and bottom ends of the air curtain body 10 of the present invention are the top and bottom ends of the air curtain when it is installed on a car and unfolded, and the front and rear ends of the air curtain body 10 are the front and rear ends of the car when the air curtain is installed on the car.

[0047] Among them, the first longitudinal seam 131 cooperates with the middle seam 12 to form a longitudinal first protection cavity 133. The first protection cavity 133 can protect the occupants in small offset collisions, and it can also protect the heads of the front seat occupants when the front seat occupants sit at a large angle.

[0048] In some of the embodiments, by adjusting the position of the first longitudinal seam 131 , the width of the first protection cavity 133 can be increased so that the first protection cavity 133 forms a safety seat protection cavity.

[0049] The first longitudinal seam 131 can guide the airflow to the first protection cavity 133 quickly, so that the first protection cavity 133 can be quickly expanded and maintain a high strength to protect the occupant's head in a small offset collision.

[0050] The first transverse seam 132 is used to guide the gas toward the second protection cavity 143 , so that the second protection cavity 143 can expand rapidly, and the second protection cavity 143 can be quickly deployed into place.

[0051] The first longitudinal seam 131 and the first transverse seam 132 are arranged in a “┐” structure as a whole.

[0052] Furthermore, the connection between the first longitudinal seam 131 and the first transverse seam 132 is located in the air inlet direction of the air inlet of the air curtain body 10, the first longitudinal seam 131 is used to guide the gas to the first protection cavity 133, and the first transverse seam 132 is used to guide the gas to the second protection cavity 143.

[0053] The present application guides the gas to the first protection cavity 133 and the second protection cavity 143 respectively through the first longitudinal seam 131 and the first transverse seam 132, so that the first protection cavity 133 and the second protection cavity 143 can be quickly deployed, and the rear end of the second protection cavity 143 can be quickly deployed, thereby solving the problem of unstable restart and deployment of existing multi-channel side air curtains.

[0054] The present application can quickly expand the first protection cavity 133 and also quickly expand the portion of the first protection cavity 133 located at the lower protrusion 11 to accommodate the occupant's head in a small offset collision, thereby solving the problems of jamming and insufficient rigidity of the bladder in the existing frame structure.

[0055] Among them, the buffer stitch 14 is used to cooperate with the guide stitch 13 to form a buffer cavity 141. The buffer cavity 141 is used to make the first protection cavity 133 and the second protection cavity 143 present a certain degree of depression when the occupant hits the first protection cavity 133 or the second protection cavity 143, so as to avoid the first protection cavity 133 and the second protection cavity 143 being too rigid.

[0056] Among them, since the expansion speed of the buffer cavity 141 is slower than that of the first protection cavity 133, in a small offset collision, the first protection cavity 133 can better support the head, and the buffer cavity 141 can also support the shoulders of the occupant when it is slowly expanded.

[0057] Furthermore, the end of the first transverse stitching line 132 away from the first longitudinal stitching line 131 is bent toward the bottom stitching line of the air curtain body 10 to guide the gas to flow toward the bottom stitching line of the air curtain body 10 .

[0058] By bending the end of the first transverse seam 132 toward the bottom seam of the air curtain body 10 , the airflow can be guided to flow quickly toward the second protection cavity 143 , and the end of the first transverse seam 132 can be prevented from being torn by gas impact.

[0059] The present application bends the end of the first transverse seam 132 away from the first longitudinal seam 131 toward the bottom seam of the air curtain body 10 , so that the rear end of the air curtain body 10 forms a substantially longitudinal cavity to protect the occupant in a side collision.

[0060] Furthermore, the extension trend of the buffer stitch 14 is the same as the extension trend of the guide stitch 13, and the buffer stitch 14 includes a second transverse stitch 144 and a second longitudinal stitch 145; the second longitudinal stitch 145 extends from the bottom end stitch of the lower protrusion 11 to the first transverse stitch 132, and the second transverse stitch 144 extends from the end of the second longitudinal stitch 145 to the rear end stitch of the first transverse stitch 132 close to the air curtain body 10.

[0061] Among them, the first transverse stitch 132 and the first longitudinal stitch 131 cooperate with the second transverse stitch 144 and the second longitudinal stitch 145 to form a "┐" structure of the buffer cavity 141 as a whole, so as to increase the volume of the buffer cavity 141 without affecting the volume of the second protection cavity 143 and the first protection cavity 133, so that the gas can first fill the first protection cavity 133 and the second protection cavity 143.

[0062] Furthermore, after the end of the first transverse seam 132 away from the first longitudinal seam 131 is bent toward the bottom seam of the air curtain body 10, it extends in the direction of the second transverse seam 144, so that a buffer air inlet 142 is formed between the first transverse seam 132 and the second transverse seam 144, and the buffer air inlet 142 is arranged toward the bottom seam of the air curtain body 10.

[0063] By arranging the buffer air inlet 142 at the bottom seam facing the air curtain body 10 , the gas can enter the buffer cavity 141 after filling the second protection cavity 143 , so as to ensure that the second protection cavity 143 is filled first.

[0064] Among them, the first transverse seam 132 is extended in the direction of the second transverse seam 144, so that the end of the first transverse seam 132 forms an arc structure, so that the airflow can enter the second protective cavity 143 more smoothly, and the end of the first transverse seam 132 will not be torn due to gas impact.

[0065] Furthermore, the air curtain structure also includes a flower-shaped stitching 15, which extends from the rear end stitching of the air curtain body 10 into the second protection cavity 143, and is used to limit the thickness of the second protection cavity 143, so that the second protection cavity 143 has sufficient rigidity.

[0066] Furthermore, the flower-shaped stitching 15 extends obliquely upward from the rear end stitching of the air curtain body 10 and is close to the first transverse stitching 132; wherein, between the flower-shaped stitching 15 and the first transverse stitching 132, a portion of the second protective cavity 143 forms a longitudinal cavity to accommodate the occupant's head.

[0067] Among them, the flower-shaped stitching 15 can make the roughly longitudinal cavity in the second protective cavity 143 still be able to swell up to a sufficient thickness when the amount of gas is insufficient, and by flexibly adjusting the length and position of the flower-shaped stitching 15, the stiffness required at different distances (the distance from the rear interior trim to the dummy's head) can be met at the same time, and the rear end size of the second protective cavity 143 can be avoided to be too large to be convenient for unfolding in the car, such as avoiding being stuck by the rear seats, and the dummy's injury value exceeding the standard.

[0068] The flower-shaped stitching 15 can cooperate with the portion of the first transverse stitching 132 that bends downward toward the air curtain body 10 to define a roughly longitudinal cavity behind the air curtain body 10 to protect the occupants.

[0069] Furthermore, the first longitudinal seam 131 is arranged to be inclined, so that the first protection cavity 133 is defined as a longitudinal cavity with an inclined angle, so that the first protection cavity 133 can drive the buffer cavity 141 to expand in the transverse and longitudinal directions.

[0070] Specifically, by setting the first longitudinal seam 131 to be inclined, the first protection cavity 133 is also limited to be inclined on at least one side. Therefore, when the first protection cavity 133 is unfolded, the first protection cavity 133 can drive the buffer cavity 141 to unfold in the horizontal and vertical directions, thereby preventing the buffer cavity 141 from being stuck in the horizontal or vertical direction (such as being stuck by a child seat) and unable to unfold quickly.

[0071] Furthermore, the middle seam 12 and the bottom seam of the lower protrusion 11 extend to form an n-type structure, and a non-inflated area is formed in the middle of the air curtain body 10, so that the gas enters the protection cavity first, avoiding the side air curtain from being unable to be fully deployed due to insufficient gas.

[0072] When the gas of the present invention flows to the rear end of the air curtain body 10, a diversion portion is formed through the first transverse seam 132 and the first longitudinal seam 131, and there is no need to introduce the airflow through other cavity channels. By adjusting the distance between the first transverse seam 132 and the top seam of the air curtain body 10 or the distance between the first longitudinal seam 131 and the central seam, the arrival time under different requirements and the small offset protection area can be met.

[0073] The present invention directly charges the first protection cavity 133 and the second protection cavity 143 through a single branch, so that the first protection cavity 133 and the second protection cavity 143 can be quickly put in place to provide protection, and the deployment posture is stable.

[0074] The present invention also provides a safety air curtain, comprising an air curtain structure as described above and an air guide bag 20, wherein the air guide bag 20 is arranged in the side air curtain, and an air outlet thereof faces the intersection of the first longitudinal seam 131 and the first transverse seam 132 in the side air curtain.

[0075] The present invention sets the first protection cavity 133 as a straight cavity, so that the side air curtain can be quickly deployed in place within a specified time and maintain good stability.

[0076] The first protection cavity 133 and the second protection cavity 143 of the safety airbag of the present invention can be filled and rigid within a specified time. At the same time, the first protection cavity 133 can drive the buffer cavity 141 to quickly reach the designated protection position to avoid the lower end of the airbag being stuck and causing deployment delay. The buffer cavity 141 is deployed after the first protection cavity 133 and the second protection cavity 143 are filled, so that the first protection cavity 133 and the second protection cavity 143 can provide better protection capabilities.

[0077] The first protection cavity 133 of the present invention can protect the head of the occupant in a small offset collision to avoid the collision between the head of the occupant and the door trim.

[0078] In this specification, the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the product embodiment described later, since it corresponds to the method, the description is relatively simple, and the relevant parts can be referred to the partial description of the system embodiment.

[0079] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An air curtain structure, comprising an air curtain body, wherein the bottom end seam of the air curtain body is bent outward to form a lower convex portion, and a longitudinal middle seam is provided on one side of the lower convex portion close to the front end of the air curtain body, characterized in that: The air curtain body comprises: A guide stitch, the guide stitch is sewn on the air curtain body, and includes a first longitudinal stitch and a first transverse stitch, the first longitudinal stitch extends from the bottom stitch of the lower convex portion to the top stitch of the air curtain body, a first protective cavity is formed between the first longitudinal stitch and the middle stitch, and the first transverse stitch extends from one end of the first longitudinal stitch close to the top stitch of the air curtain body to the rear end of the air curtain body; A buffer stitch, wherein the buffer stitch is sewn on the air curtain body and is located on a side of the guide stitch close to the rear end stitch of the air curtain body, a buffer cavity with a buffer air inlet is formed between the buffer stitch and the guide stitch, and the buffer stitch and the first transverse stitch jointly define a second protective cavity at the rear end of the air curtain body.

2. The air curtain structure according to claim 1, characterized in that: The connection between the first longitudinal seam and the first transverse seam is located in the air inlet direction of the air inlet of the air curtain body. The first longitudinal seam is used to guide the gas to the first protection cavity, and the first transverse seam is used to guide the gas to the second protection cavity.

3. The air curtain structure according to claim 1, characterized in that: The end of the first transverse seam away from the first longitudinal seam is bent toward the bottom seam of the air curtain body to guide the gas to flow toward the bottom seam of the air curtain body.

4. The air curtain structure according to claim 3, characterized in that: The extension trend of the buffer suture is the same as the extension trend of the diversion suture, and the buffer suture includes a second transverse suture and a second longitudinal suture; The second longitudinal stitching line extends from the bottom end stitching line of the lower protrusion to the first transverse stitching line, and the second transverse stitching line extends from the end of the second longitudinal stitching line to the first transverse stitching line close to the rear end stitching line of the air curtain body.

5. The air curtain structure according to claim 4, characterized in that: After the end of the first transverse seam away from the first longitudinal seam is bent toward the bottom seam of the air curtain body, it extends in the direction of the second transverse seam, so that the buffer air inlet is formed between the first transverse seam and the second transverse seam, and the buffer air inlet is arranged toward the bottom seam of the air curtain body.

6. The air curtain structure according to claim 3, characterized in that: It also includes a flower-shaped stitching line, which extends from a rear end stitching line of the air curtain body into the second protection cavity and is used to limit the thickness of the second protection cavity.

7. The air curtain structure according to claim 6, characterized in that: The flower-shaped stitching line extends obliquely upward from the rear end stitching line of the air curtain body and is close to the first transverse stitching line; Part of the second protective cavity is formed between the flower-shaped stitching and the first transverse stitching to form a longitudinal cavity for accommodating the head of the occupant.

8. The air curtain structure according to claim 1, characterized in that: The first longitudinal suture is arranged obliquely, so that the first protection cavity is defined as a longitudinal cavity with an inclined angle, so that the first protection cavity can drive the buffer cavity to expand in the transverse and longitudinal directions.

9. The air curtain structure according to claim 1, characterized in that: The middle seam and the bottom end seam of the lower convex portion extend to form an n-type structure, and a non-inflatable area is formed in the middle of the air curtain body.

10. A safety air curtain, characterized in that: include: The air curtain structure according to any one of claims 1 to 9; An air guide bag is arranged in the side air curtain, and an air outlet of the air guide bag faces the intersection of the first longitudinal seam and the first transverse seam in the side air curtain.

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