Far-end air bag structure with good protectiveness

Abstract

The invention provides a far-end air bag structure with good protectiveness. The far-end air bag structure comprises an air bag body, and the air bag body comprises inner main piece cloth, a cloth piece sewing thread, outer main piece cloth, an upper sewing thread, a lower sewing thread, a first folding sewing thread and an air inlet hole. The design of the main cavity and the auxiliary cavity is adopted, the auxiliary cavity is overlapped with the main cavity after being folded and is fixed through the folding sewing thread, the overall thickness of the air bag is increased when the auxiliary cavity and the main cavity are overlapped and expanded, and the problem that the lateral offset of the head cannot be effectively limited due to the insufficient thickness of an existing single-cavity air bag when only a driver has a passenger is solved; the protection requirement of the latest collision regulations on single-person riding is met; meanwhile, the double cavities cover the head and chest areas of a main driver and a co-driver after being overlapped and expanded, and are matched with the irregular shapes of the inner main piece cloth and the outer main piece cloth to adapt to the complex space, so that the coverage range is expanded, the buffering effect on the chest and the upper trunk is enhanced, and the defects that an existing air bag is limited in coverage range and insufficient in buffering effect are overcome.

Description

Technical Field

[0001] This invention relates to the field of airbag technology, and in particular to a distal airbag structure with good protection. Background Technology

[0002] With the continuous upgrading of automotive safety regulations and the increasing attention users pay to travel safety, the performance requirements of automotive passive safety systems are becoming increasingly stringent. As a key component of side-impact protection, the remote airbag's core function is to rapidly inflate during a side-impact collision to avoid or mitigate direct impact or excessive displacement injuries to the head and chest of the driver and front passenger.

[0003] Existing remote airbag products are mostly single-cavity designs, which can only reduce the risk of mutual collision by isolating the heads of the driver and front passenger when both are present. However, in scenarios where only the driver is present, the airbag thickness is insufficient to effectively limit the lateral displacement of the driver's head, making it difficult to meet the protection requirements of the latest collision regulations for single-occupant vehicles. In addition, the existing airbag cavity structure is simple and has a limited coverage area, resulting in insufficient cushioning effect on the chest and upper torso. Therefore, a remote airbag structure with good protection is proposed. Summary of the Invention

[0004] In view of this, the present invention aims to provide a distal airbag structure with good protection to solve or alleviate the technical problems existing in the prior art, and at least provide a beneficial alternative.

[0005] The technical solution of this invention is implemented as follows: a distal airbag structure with good protection includes an airbag body, the airbag body including an inner main fabric, fabric seams, an outer main fabric, an upper sewing thread, a lower sewing thread, a first folded sewing thread, a second folded sewing thread, a main cavity, a secondary cavity, and an air inlet. The outer main fabric is fixedly connected to the back surface of the inner main fabric by fabric stitching. The upper and lower parts of one side of the front surface of the inner and outer main fabrics are fixedly connected by upper and lower stitching, respectively. The upper part of the other side of the front surface of the inner and outer main fabrics is fixedly connected to the side of the front surface of the inner and outer main fabrics near the upper stitching by a first folded stitching. The two sides of the front surface of the inner and outer main fabrics are fixedly connected by a second folded stitching. A main cavity and a secondary cavity are provided between the inner and outer main fabrics. The secondary cavity is located in front of the main cavity. An air inlet is provided on the lower part of the front surface of the inner main fabric near the lower stitching.

[0006] More preferably, both the upper and lower sewing threads are in the shape of a double-circular disc with a connecting line.

[0007] More preferably, both the inner and outer main fabric pieces are irregular in shape.

[0008] More preferably, the secondary cavity is folded over and fitted to the main cavity, and is partially sewn and fixed by a first folding sewing thread and a second folding sewing thread to form a structure in which the main cavity and the secondary cavity overlap. A connecting channel is provided between the main cavity and the secondary cavity, and the gas in the main cavity flows into the secondary cavity through the connecting channel.

[0009] More preferably, the air inlet is used for inserting a gas generator, and the diameter of the air inlet is adapted to the insertion end size of the gas generator.

[0010] Preferably, both the inner main fabric and the outer main fabric are special fabrics for airbags.

[0011] More preferably, the upper and lower sewing threads partially sew the inner main fabric piece to the outer main fabric piece.

[0012] More preferably, the upper and lower sewing threads cooperate with the fabric stitching to control the overall thickness of the airbag body and keep the main cavity and secondary cavity in a compact folded state before inflation.

[0013] More preferably, the airbag body is installed on the side of the driver's seat closest to the interior of the vehicle by fastening components, and inflates between the driver and passenger seats in the event of a side collision.

[0014] More preferably, the main cavity and the secondary cavity, after being superimposed and expanded, cover the head and chest areas of the driver and passenger.

[0015] The embodiments of the present invention have the following advantages due to the adoption of the above technical solutions: This invention employs a main cavity and a secondary cavity design. The secondary cavity folds over and overlaps with the main cavity, and is fixed by folding sewing lines. When the airbag expands, the overall thickness of the airbag is increased, solving the problem that existing single-cavity airbags cannot effectively limit the lateral head displacement when only the driver is present. This meets the latest collision regulations for protection when only one person is in the vehicle. At the same time, the double-cavity airbags, when expanded, cover the head and chest areas of both the driver and passenger. The irregular shapes of the inner and outer main fabrics adapt to complex spaces, expanding the coverage area and enhancing the cushioning effect on the chest and upper torso. This overcomes the shortcomings of existing airbags, such as limited coverage and insufficient cushioning effect.

[0016] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 Schematic diagram of the overall cross-sectional structure; Figure 3 This is a schematic diagram of the folded structure of the present invention; Figure 4 For the present invention Figure 3 A schematic diagram of the overall cross-sectional structure in the transverse direction; Figure 5 For the present invention Figure 3 A schematic diagram of the longitudinal overall cross-sectional structure.

[0019] Reference numerals: 1. Airbag body; 11. Inner main fabric piece; 12. Fabric stitching; 13. Outer main fabric piece; 14. Upper stitching; 15. Lower stitching; 16. First fold stitching; 17. Second fold stitching; 18. Main cavity; 19. Secondary cavity; 20. Air inlet; 21. Connecting channel. Detailed Implementation

[0020] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0021] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0022] like Figures 1-5 As shown, this embodiment of the invention provides a distal airbag structure with good protection, including an airbag body 1. The airbag body 1 includes an inner main fabric 11, fabric stitching 12, an outer main fabric 13, an upper stitching 14, a lower stitching 15, a first folded stitching 16, a second folded stitching 17, a main cavity 18, a secondary cavity 19, and an air inlet 20. The outer main fabric 13 is fixedly connected to the back surface of the inner main fabric 11 by fabric stitching 12. The upper and lower parts of one side of the front surface of the inner main fabric 11 and the outer main fabric 13 are fixedly connected by upper stitching 14 and lower stitching 15 respectively. The upper part of the other side of the front surface of the inner main fabric 11 and the outer main fabric 13 is fixedly connected to the side of the front surface of the inner main fabric 11 and the outer main fabric 13 near the upper stitching 14 by first folded stitching 16. The two sides of the front surface of the inner main fabric 11 and the outer main fabric 13 are fixedly connected by second folded stitching 17. A main cavity 18 and a secondary cavity 19 are provided between the inner main fabric 11 and the outer main fabric 13. The secondary cavity 19 is located in front of the main cavity 18. An air inlet 20 is provided on the lower part of the front surface of the inner main fabric 11 near the lower stitching 15. The airbag body 1 is composed of an inner main piece of fabric 11 and an outer main piece of fabric 13. These two types of fabric are the basic materials for forming the airbag cavity. The inner main piece of fabric 11 and the outer main piece of fabric 13 are sewn together along the edge by fabric stitching 12. This connection forms the basic outline of the airbag and provides a basis for the cavity closure. The front surfaces of the inner main fabric 11 and the outer main fabric 13 are connected at the top by an upper sewing thread 14 and at the bottom by a lower sewing thread 15, which are used to separate the cavity and control the thickness of the airbag. The upper part of the other side of the front surface of the inner main fabric 11 and the outer main fabric 13 is fixed to the side of the inner main fabric 11 and the outer main fabric 13 near the upper sewing line 14 by the first folding sewing line 16. The two sides of the front surface are connected by the second folding sewing line 17. The first folding sewing line 16 and the second folding sewing line 17 are used to fold the secondary cavity 19 and fix it with the main cavity 18 to form an overlapping shape. After being folded and fixed, the inner main fabric 11 and the outer main fabric 13 form an overlapping main cavity 18 and a secondary cavity 19, constituting a "dual-cavity airbag". This dual-cavity design is the core structural basis for the airbag to "cover the head and chest area of ​​the driver and passenger" and "increase the overall thickness of the airbag". An air inlet 20 is provided on the lower part of the front surface of the inner main fabric 11 near the lower sewing line 15. This is used for inserting a gas generator to inflate the main cavity 18 and the secondary cavity 19, and serves as the air intake channel for the airbag expansion.

[0023] In one embodiment, specifically: both the upper sewing thread 14 and the lower sewing thread 15 are in the shape of a double circular disc with connecting lines; The double-circular pie shape with connecting lines refers to the fact that the trajectories of both the upper sewing thread 14 and the lower sewing thread 15 are composed of two parts: a double-circular pie shape and a connecting line shape. Double circular disc shape: The sewing thread forms a closed or semi-closed trajectory in two areas that resembles a circle (or is close to a circle), resembling a "disc shape", corresponding to the core area of ​​the main cavity 18; Connection shape: Between the two "circular pie-shaped" areas, there is a continuous sewing line connecting the two, forming a continuous overall trajectory; The upper sewing thread 14 and the lower sewing thread 15, through the "double circular disc" section, divide the space between the inner main fabric 11 and the outer main fabric 13 into multiple independent areas. This division clarifies the boundary between two adjacent cavities and lays the foundation for the independent expansion and synergistic effect of the subsequent cavities. Meanwhile, the upper sewing thread 14 and the lower sewing thread 15 sew the inner main fabric 11 and the outer main fabric 13 together, limiting the degree of separation of the fabric in the sewing area; the dense sewing trajectory of the "double circular disc" can effectively constrain the expansion range when the cavity is inflated, avoid the airbag thickness being too large or too small, and ensure that it can accurately cover the head and chest area of ​​the driver and passenger in the event of a side collision.

[0024] In one embodiment, specifically: both the inner main fabric 11 and the outer main fabric 13 have irregular shapes; Among them, the irregular shape refers to the fact that the outlines of the inner main fabric 11 and the outer main fabric 13 are not standard geometric shapes (such as circles, rectangles, polygons, etc.), but are designed as special outlines with no fixed rules on the edges and adapted to complex spaces, according to the actual protection range of the airbag, the installation space and the shape requirements after inflation. The core function of this remote airbag is to rapidly inflate and cover the head and chest areas of the driver and passenger in the event of a side collision. It must also adapt to the narrow space between the driver and passenger (such as seat gaps, the layout of the center console and seats). The space between the driver and passenger is irregular in shape (affected by seat design and the layout of interior components), and the head and chest areas to be covered follow the curves of the human body, not a regular geometric space. If the inner main fabric 11 and outer main fabric 13 have regular shapes (such as rectangles), they will not fit snugly against the protected area after inflation, resulting in incomplete coverage of some critical areas (such as the sides of the head and the outer side of the chest) or unnecessary interference with surrounding components, affecting inflation efficiency and protective effect. In addition, the irregular shapes of the inner main fabric 11 and the outer main fabric 13 can precisely match the layout requirements of the main cavity 18 and the secondary cavity 19. The main cavity 18 needs to cover the key area of ​​the driver's side, and the secondary cavity 19 needs to cover the passenger side or be superimposed on the main cavity 18 to increase the thickness. The spatial distribution of the two is asymmetrical. The irregular fabric outline can provide a matching basis for the separation and sewing of the two cavities, ensuring that the cavity conforms to the preset expansion trajectory after molding. Therefore, the irregularly shaped inner main fabric 11 and outer main fabric 13 are the basis for achieving the "irregular overall shape of the airbag cavity". This design allows the airbag to fit the body contours and surrounding space of the driver and passenger after inflation, maximizing the coverage of vulnerable areas such as the head and chest, avoiding blind spots caused by regular shapes, and thus better achieving the goal of "reducing head displacement and reducing collision risk".

[0025] In one embodiment, specifically: the secondary cavity 19 is folded over and fitted to the main cavity 18, and is partially sewn and fixed by the first folding sewing thread 16 and the second folding sewing thread 17 to form an overlapping structure of the main cavity 18 and the secondary cavity 19. A connecting channel 21 is provided between the main cavity 18 and the secondary cavity 19, and the gas in the main cavity 18 flows into the secondary cavity 19 through the connecting channel 21. The folding of the secondary cavity 19 is not the splicing of independent components, but rather a folding process based on the same set of fabrics (inner main fabric 11 and outer main fabric 13). Through the "partial stitching" of the first folding sewing thread 16 and the second folding sewing thread 17, the folded secondary cavity 19 can be stably attached to the surface of the main cavity 18 to form an overlapping structure. By using the first folding sewing thread 16 and the second folding sewing thread 17 to partially stitch and fix the folded secondary cavity 19 to the main cavity 18, the stability of the overlapping structure is ensured, and deformation space is reserved for expansion during inflation, avoiding the impact of excessive constraint on cavity unfolding. The connecting channel 21 is the gas flow path between the main cavity 18 and the secondary cavity 19. During inflation, the gas first enters the main cavity 18 through the air inlet 20, causing it to expand rapidly and stretch the basic outline. Subsequently, the gas in the main cavity 18 flows into the secondary cavity 19 through the connecting channel 21, driving the secondary cavity 19 to expand synchronously. Since the secondary cavity 19 is attached to the surface of the main cavity 18, its expansion will be directly superimposed on the thickness of the main cavity 18, forming a double-cavity superimposed expansion effect, which is used to increase the overall thickness of the airbag and ultimately achieve effective protection for the occupant's head and upper torso.

[0026] In one embodiment, specifically: the air inlet 20 is used for inserting a gas generator, and the diameter of the air inlet 20 is adapted to the insertion end size of the gas generator; The air inlet 20 provides an insertion channel for the gas generator, allowing the generator to directly connect with the main cavity 18 of the airbag body 1; this is the starting point for airbag inflation—when the vehicle is involved in a side collision, the gas generator rapidly releases gas into the cavity through the air inlet 20, thereby achieving rapid inflation of the airbag.

[0027] In one embodiment, specifically: both the inner main fabric 11 and the outer main fabric 13 are airbag-specific fabrics; The special fabric used for airbags is typically made of nylon 66 (polyamide 66) and treated with silicone rubber or polyurethane coating. It is not an ordinary fabric, but a special material designed for the working environment of airbags (instantaneous high-pressure inflation, impact). Its characteristics are highly matched with the core functional requirements of airbags, mainly in the following aspects: High strength and tear resistance: Airbags need to be rapidly inflated to a preset pressure during a side impact (usually accompanied by instantaneous high pressure) and must withstand the impact force of the occupant collision; special fabric can resist the expansion tension during inflation and the compressive stress during the collision, avoiding rupture and ensuring that the cavity does not leak and the structure does not fail; Sealing: As the basic material for forming the main cavity 18 and the secondary cavity 19, the special fabric must have good airtightness to prevent gas from leaking out quickly after inflation and to ensure that the airbag can maintain sufficient expansion shape and thickness during the critical protection period (from the moment of collision to the completion of occupant cushioning). Aging resistance and stability: The automotive environment is complex (temperature changes, vibration, etc.), and special fabrics need to maintain stable performance over a long period of time to avoid strength reduction or sealing failure due to aging, and to ensure that the airbag can be reliably triggered throughout the vehicle's entire life cycle.

[0028] In one embodiment, specifically: the upper sewing thread 14 and the lower sewing thread 15 partially sew the inner main fabric 11 to the outer main fabric 13; Among them, partial sewing means that the upper sewing thread 14 and the lower sewing thread 15 do not completely seal the inner main fabric 11 and the outer main fabric 13, but only sew in a specific area, leaving the unsewn area as the inflation cavity space of the airbag; this sewing method not only achieves the fixation between the fabrics, but also reserves the necessary space for the formation of the cavity.

[0029] In one embodiment, specifically: the upper sewing thread 14, the lower sewing thread 15 cooperate with the fabric sewing thread 12 to control the overall thickness of the airbag body 1 and to keep the main cavity 18 and the secondary cavity 19 in a compact folded state before inflation; Among them, the fabric stitching 12 is sewn along the edge of the inner main fabric 11 and the outer main fabric 13, which defines the maximum outline boundary of the airbag, limits the separation range of the fabric at the edge, and avoids excessive expansion of the edge during inflation, which would cause the overall thickness to become out of control. The internal constraints of the upper sewing line 14 and the lower sewing line 15, through the partial stitching of "double circular disc shape plus connecting line shape", form multiple fixing points inside the airbag, constraining the separation distance of the inner main piece fabric 11 and the outer main piece fabric 13 in the core area. The edge fabric stitching 12, together with the internal upper stitching 14 and lower stitching 15, forms a "whole-part" constraint network. This ensures that the airbag inflates to the preset protective thickness (meeting the support requirements of "covering the head and chest area"), while avoiding uneven thickness due to excessive local expansion (such as some areas being too thick, affecting deployment efficiency, or too thin, reducing the cushioning effect). In addition, the combination of edge shaping and internal node fixing allows the main cavity 18 and the secondary cavity 19 to fold along a preset trajectory (such as the secondary cavity 19 folding to fit the main cavity 18), and maintain a stable shape after folding, without occupying too much interior space, and adapting to the installation environment inside the driver's seat.

[0030] In one embodiment, specifically: the airbag body 1 is installed on the side of the driver's seat of the car near the interior of the vehicle by fastening components, and can quickly inflate between the driver's seat and the passenger seat in the event of a side collision; The driver's seat features a precise layout for airbag protection on the inner side, between the driver and passenger seats. This position is close to the heads and chests of the occupants on both sides and avoids obstruction from other interior components (such as the edge of the center console or seat armrests). This layout ensures that when the airbag inflates, it can quickly deploy to the core protection area between the driver and passenger seats via the shortest path, avoiding insufficient coverage due to an off-center installation position. At the same time, the installation method close to the driver's seat better adapts to the structural characteristics of the dual-chamber design where "the secondary chamber 19 overlaps with the main chamber 18 after folding"—the folded airbag can be compactly stored inside the seat without taking up too much interior space, while reserving sufficient deformation space for rapid deployment in the event of a side collision. The core function of fastening components (such as bolts, clips, etc.) is to ensure that the airbag body 1 remains stably installed during normal vehicle operation. During vehicle operation, there are vibrations and bumps. Fastening components can prevent the airbag from shifting its installation position due to loosening, and avoid deviation of the coverage area after inflation due to inaccurate initial position during side collisions. When a side collision occurs, the vehicle will generate a violent impact. Fastening components can firmly fix the airbag in the preset position, ensuring that its inflation direction and trajectory are controllable, and ultimately accurately deploying between the driver and passenger seats.

[0031] In one embodiment, specifically: the main cavity 18 and the secondary cavity 19 are superimposed and expanded to cover the head and chest areas of the driver and passenger. In this design, the secondary cavity 19, after folding, is partially fixed to the main cavity 18 via the first folding sewing line 16 and the second folding sewing line 17, forming an overlapping base. During inflation, the main cavity 18 expands first, stretching its outline, and then the gas flows into the secondary cavity 19 through the connecting channel 21, causing both to expand synchronously and maintain an overlapping state—ultimately forming a thickened structure with the main cavity 18 as the base support and the secondary cavity 19 superimposed on it, rather than the separate expansion of two independent cavities. The head and chest are the most vulnerable and critical areas for injury to occupants during a side collision, and the superimposed expansion of the dual cavities achieves precise coverage in the following way: Spatial adaptability: The irregular shapes of the inner main fabric 11 and the outer main fabric 13, combined with the overlapping shape of the double cavity, can conform to the physiological structure of the human head (arc contour) and chest (torso curve), avoiding blind spots caused by regular shapes. Extended coverage: The main cavity 18 primarily covers the head and chest on the driver's side, while the superimposed secondary cavity 19 extends towards the passenger side, forming a continuous protection zone "from the driver's side to the passenger's side," ensuring that the critical parts of the occupants on both sides are covered by the airbag.

[0032] When the invention is in operation: the airbag body 1 is pre-installed on the side of the driver's seat of the car near the interior of the vehicle by fastening components (such as bolts and buckles); at this time, the airbag is in a compact folded state, the inner main fabric 11 and the outer main fabric 13 are sewn together along the edge by fabric stitching 12 to form a basic outline, the secondary cavity 19 is folded and then partially sewn together with the main cavity 18 by the first folding sewing line 16 and the second folding sewing line 17 to form an overlapping structure; the upper sewing line 14 and the lower sewing line 15 (double circular disc shape with connecting line shape) cooperate with the fabric stitching 12 to constrain the relative position of the inner main fabric 11 and the outer main fabric 13, ensuring that the main cavity 18 and the secondary cavity 19 do not loosen when folded, adapt to the limited space inside the driver's seat, and are ready to be deployed at any time; When a side collision occurs, the vehicle collision sensor detects the collision signal and quickly triggers the gas generator to operate. The gas generator's insertion end is inserted through the air inlet 20 on the inner main fabric 11 (the diameter of the air inlet 20 is adapted to the generator insertion end to ensure a seal and stability), and then instantly releases high-pressure gas. The high-pressure gas flows directly into the main cavity 18 through the air inlet 20. The inner main fabric 11 and the outer main fabric 13 (airbag-specific nylon 66 fabric, with a coating treatment) separate and unfold under gas pressure. Due to the "double circular disc-shaped" partial stitching of the upper sewing thread 14 and the lower sewing thread 15, the main cavity 18 is confined to the preset core area. Intra-domain expansion avoids irregular expansion; the fabric seam 12 constrains the fabric separation range along the edge to prevent excessive expansion of the airbag edge from causing the overall shape to become out of control, ensuring that the main cavity 18 is initially expanded along the "double circular disc" trajectory to form a basic support outline, while controlling the initial thickness to adapt to the installation space and subsequent expansion requirements; after the main cavity 18 expands to the preset shape, the internal gas flows to the secondary cavity 19 through the connecting channel 21: the secondary cavity 19 is pre-folded and overlapped and fixed with the main cavity 18, and expands synchronously under gas pressure. Its expansion direction is constrained by the first fold sewing line 16 and the second fold sewing line 17, and is always superimposed on the surface of the main cavity 18; At this point, the "double circular disc" sections of the upper sewing thread 14 and the lower sewing thread 15 further limit the local expansion of the main cavity 18 and the secondary cavity 19. Combined with the edge constraint of the fabric sewing thread 12, the overall thickness of the double cavity after stacking is precisely controlled within the preset range (meeting the support strength while avoiding excessive expansion and interference with surrounding components). As gas continues to fill, the dual cavities complete their final expansion. The irregular shapes of the inner main fabric 11 and the outer main fabric 13 begin to play their role, working in conjunction with the superimposed shape of the dual cavities to precisely fit the spatial contours between the driver and passenger seats (adapting to complex environments such as seat gaps and human body curves). The main cavity 18 primarily covers the head and chest on the driver's side, while the superimposed secondary cavity 19 extends towards the passenger side, forming a continuous protection area "from the driver to the passenger," ultimately fully covering the head and chest of the occupants on both sides. During this process, the high strength and tear resistance of the airbag-specific fabric ensure that the cavities do not rupture, while the sealing maintains the expanded shape until the collision buffering is complete. When an occupant is displaced to the sides due to a side impact, the added thickness enhances the support for the head, effectively limiting the amount of lateral head displacement and reducing the risk of impacting the door interior or other occupants; at the same time, the airbag covering the chest area, in conjunction with the seat belt, disperses the impact force of the collision and reduces chest compression injuries. After the collision, the gas inside the airbag is slowly released through the micro-gaps in the fabric to avoid secondary impact and complete the entire protection process.

[0033] In summary, this invention, through a continuous process of "folding and waiting - triggering gas generation - main cavity expansion - secondary cavity superposition - precise coverage - buffer protection," transforms the structural advantages of dual-cavity design, sewing thread constraints, and special fabric characteristics into practical protective effects, achieving efficient protection for occupants in side-impact scenarios.

[0034] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in the present invention, and these should all be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A distal airbag structure with good protection, characterized in that: The airbag body (1) includes an inner main fabric piece (11), fabric stitching (12), an outer main fabric piece (13), an upper stitching thread (14), a lower stitching thread (15), a first fold stitching thread (16), a second fold stitching thread (17), a main cavity (18), a secondary cavity (19), and an air inlet (20). The outer main fabric (13) is fixedly connected to the back surface of the inner main fabric (11) by fabric stitching (12). The upper and lower parts of one side of the front surface of the inner main fabric (11) and the outer main fabric (13) are fixedly connected by upper stitching (14) and lower stitching (15) respectively. The upper part of the other side of the front surface of the inner main fabric (11) and the outer main fabric (13) is fixedly connected to the inner main fabric (11) and the outer main fabric (13) by first folding stitching (16). The front surface of the inner main fabric (11) is close to the upper sewing line (14). The front surfaces of the inner main fabric (11) and the outer main fabric (13) are fixedly connected by the second folded sewing line (17). A main cavity (18) and a secondary cavity (19) are provided between the inner main fabric (11) and the outer main fabric (13). The secondary cavity (19) is located in front of the main cavity (18). An air inlet (20) is provided on the lower part of the front surface of the inner main fabric (11) close to the lower sewing line (15).

2. The distal airbag structure with good protection according to claim 1, characterized in that: Both the upper sewing thread (14) and the lower sewing thread (15) are double-circular disc-shaped with connecting lines.

3. The distal airbag structure with good protection according to claim 1, characterized in that: The inner main fabric (11) and the outer main fabric (13) are both irregular in shape.

4. The distal airbag structure with good protection according to claim 1, characterized in that: The secondary cavity (19) is folded over and fits into the main cavity (18), and is partially sewn and fixed by the first fold sewing thread (16) and the second fold sewing thread (17) to form an overlapping structure of the main cavity (18) and the secondary cavity (19). A connecting channel (21) is provided between the main cavity (18) and the secondary cavity (19), and the gas in the main cavity (18) flows into the secondary cavity (19) through the connecting channel (21).

5. The distal airbag structure with good protection according to claim 1, characterized in that: The air inlet (20) is used for inserting a gas generator, and the diameter of the air inlet (20) is adapted to the insertion end size of the gas generator.

6. The distal airbag structure with good protection according to claim 1, characterized in that: Both the inner main fabric (11) and the outer main fabric (13) are special fabrics for airbags.

7. The distal airbag structure with good protection according to claim 1, characterized in that: The upper sewing thread (14) and the lower sewing thread (15) partially sew the inner main fabric (11) to the outer main fabric (13).

8. The distal airbag structure with good protection according to claim 1, characterized in that: The upper sewing thread (14), lower sewing thread (15) and fabric sewing thread (12) work together to control the overall thickness of the airbag body (1) and keep the main cavity (18) and the secondary cavity (19) in a compact folded state before inflation.

9. The distal airbag structure with good protection according to claim 1, characterized in that: The airbag body (1) is installed on the side of the driver's seat of the car near the interior of the car by fastening components, and inflates between the driver's seat and the passenger seat in the event of a side collision.

10. The distal airbag structure with good protection according to claim 1, characterized in that: The main cavity (18) and the secondary cavity (19) expand together to cover the head and chest areas of the driver and passenger.

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