Knee airbag structure and vehicle

Abstract

The invention discloses a knee air bag structure and a vehicle, and relates to the technical field of vehicle manufacturing, the knee air bag structure comprises an air bag main body, the air bag main body comprises a shank protection part and an instep protection part, and the shank protection part and the instep protection part are connected in a bending manner; the at least one air bag drawstring is connected to the air bag main body, and the air bag main body is arranged to enable the shank protection part and the instep protection part to be unfolded at a set angle under the action of the at least one air bag drawstring when the air bag main body is inflated. According to the knee air bag structure provided by the embodiment of the invention, the air bag main body forms the shank protection part and the instep protection part, and the shank protection part and the instep protection part are unfolded at the set angle under the action of the at least one air bag drawstring when the air bag main body is inflated, so that the air bag main body can be unfolded according to the preset unfolding direction and path; the airbag main body is prevented from colliding with an inner protective plate of the automobile or falling down towards the knees of the passenger when being unfolded, and the reliability of protecting the passenger by the knee airbag structure is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle manufacturing, and in particular to a knee airbag structure and a vehicle. Background Art

[0002] In the automotive passive safety system, existing knee airbags have problems with inaccurate deployment and difficult to effectively control the deployment posture during a collision. This results in the airbags being unable to fully exert their protective role and may even cause secondary injuries to the driver and passengers due to abnormal deployment. There is room for improvement. Summary of the Invention

[0003] The present invention aims to address at least one of the technical problems existing in the prior art. To this end, the present invention provides a knee airbag structure that can protect the occupant's lower legs and feet, respectively. The airbag body deploys according to a predetermined deployment direction and path, preventing the airbag body from striking the vehicle's interior fenders or falling toward the occupant's knees during deployment, thereby improving the reliability of the knee airbag structure in protecting the occupant.

[0004] According to an embodiment of the present invention, the knee airbag structure includes: an airbag main body, the airbag main body includes a calf protection part and an instep protection part, the calf protection part and the instep protection part are bent and connected; at least one airbag drawstring, at least one of the airbag drawstrings is connected to the airbag main body, and the airbag main body is configured to, when inflated, cause the calf protection part and the instep protection part to unfold at a set angle under the action of at least one airbag drawstring.

[0005] According to the knee airbag structure of an embodiment of the present invention, the calf protection portion and the instep protection portion are formed on the airbag body, thereby protecting the calf and the foot of the occupant respectively. The airbag body is configured to expand the calf protection portion and the instep protection portion at a set angle under the action of at least one airbag strap when inflated, so that the airbag body can expand according to a predetermined expansion direction and path, thereby preventing the airbag body from hitting the inner guard plate of the car or falling toward the occupant's knees during expansion, thereby improving the reliability of the knee airbag structure in protecting the occupant.

[0006] According to the knee airbag structure of some embodiments of the present invention, there are two airbag drawstrings, namely a first drawstring and a second drawstring. The first drawstring is located in the instep protection part, and the second drawstring is located in the calf protection part. When the airbag main body is inflated, the first drawstring and the second drawstring act together on the airbag main body.

[0007] According to some embodiments of the present invention, the knee airbag structure has relatively distributed inner and outer walls within the airbag body; wherein, one end of the first drawstring is connected to the inner wall to form a first inner suture line and the other end is connected to the outer wall to form a first outer suture line, one end of the second drawstring is connected to the inner wall to form a second inner suture line and the other end is connected to the outer wall to form a second outer suture line, and the distance between the first inner suture line and the second inner suture line is smaller than the distance between the first outer suture line and the second outer suture line.

[0008] According to some embodiments of the knee airbag structure of the present invention, the distance between the first inner suture line and the second inner suture line is L1, the distance between the first outer suture line and the second outer suture line is L2, and they satisfy: 1 / 3≤L1 / L2≤1 / 2.

[0009] According to the knee airbag structure of some embodiments of the present invention, the distance between the first inner suture line and the first outer suture line is L3, and satisfies: L2-10mm≤L3≤L2+10mm; and / or, the distance between the second inner suture line and the second outer suture line is L4, and satisfies: L2-10mm≤L4≤L2+10mm.

[0010] According to some embodiments of the knee airbag structure of the present invention, at least a portion of one end of the second draw strap extends to the first inner suture line and is connected to one end of the first draw strap and the inner side wall.

[0011] According to the knee airbag structure of some embodiments of the present invention, the outer side wall includes a side wall body and an outer deformation portion, the side wall body is formed with a deformation notch, and the outer deformation portion is connected to the deformation notch; wherein, at least a portion of the other end of the first drawstring is sewn between one side edge of the deformation notch and one side edge of the outer deformation portion, and at least a portion of the other end of the second drawstring is sewn between the other side edge of the deformation notch and the other side edge of the outer deformation portion.

[0012] According to the knee airbag structure of some embodiments of the present invention, the airbag drawstring is provided as one, the airbag drawstring is provided on the outside of the airbag body and is constructed as an external drawstring, one end of the external drawstring is connected to the calf protection part and the other end is connected to the instep protection part.

[0013] According to some embodiments of the knee airbag structure of the present invention, the airbag body has an inner protection surface facing the inner guard plate of the automobile and an outer protection surface facing the occupant, and both ends of the external drawstring are connected to the inner protection surface.

[0014] According to some embodiments of the present invention, the knee airbag structure further includes an airbag box, the airbag body is adapted to be stored in the airbag box after being folded, the airbag box has an ejection port, and the airbag body is adapted to be directionally ejected from the ejection port.

[0015] According to the knee airbag structure of some embodiments of the present invention, a fixed surface is provided at the top of the airbag box, the ejection port is provided at the bottom of the airbag box, the airbag body pops out toward the rear and downward from the ejection port, and an angle α is formed between an extension direction of at least a portion of an end of the airbag body away from the inflation port within the airbag box and the fixed surface, and the angle satisfies the following conditions: 35°≤α≤45°.

[0016] According to the knee airbag structure of some embodiments of the present invention, the airbag body is provided with an inflation port, and the airbag body has a first transverse folding line and a second transverse folding line spaced apart along the length direction, the airbag body is suitable for folding from an end away from the inflation port to the first transverse folding line, and then folding from an end located at the first transverse folding line to the second transverse folding line; and the airbag body also has a first longitudinal folding line and a second longitudinal folding line spaced apart along the width direction, and both sides of the airbag body are suitable for folding inward along the first longitudinal folding line and the second longitudinal folding line, respectively.

[0017] According to some embodiments of the knee airbag structure of the present invention, an airbag tightening member is connected to one end of the airbag body close to the inflation port, and the airbag tightening member is suitable for tightening the airbag body after the airbag body is folded.

[0018] The present invention also provides a vehicle.

[0019] According to an embodiment of the present invention, a vehicle comprises an automobile inner guard plate and the knee airbag structure described in any one of the above embodiments, wherein the airbag body is adapted to be accommodated inside the automobile inner guard plate and, after being deployed, is adapted to extend between the automobile inner guard plate and the passenger.

[0020] The advantages of the vehicle and the knee airbag structure described above over the prior art are the same and will not be described in detail here.

[0021] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0023] Figure 1This is a schematic diagram of the structure of the air bag body according to an embodiment of the present invention. Figure 1 ;

[0024] Figure 2 This is a schematic diagram of the structure of the air bag body according to an embodiment of the present invention. Figure 2 ;

[0025] Figure 3 is a schematic diagram of a deployment path of an airbag body of a knee airbag structure according to an embodiment of the present invention;

[0026] Figure 4 is a schematic diagram of a knee airbag structure in a static state according to an embodiment of the present invention;

[0027] Figure 5 Schematic diagram of the deployment state of the knee airbag structure according to an embodiment of the present invention Figure 1 ;

[0028] Figure 6 Schematic diagram of the deployment state of the knee airbag structure according to an embodiment of the present invention Figure 2 ;

[0029] Figure 7 Schematic diagram of the deployment state of the knee airbag structure according to an embodiment of the present invention Figure 3 ;

[0030] Figure 8 Schematic diagram of the folding steps of the air bag body according to an embodiment of the present invention Figure 1 ;

[0031] Figure 9 Schematic diagram of the folding steps of the air bag body according to an embodiment of the present invention Figure 2 ;

[0032] Figure 10 Schematic diagram of the folding steps of the air bag body according to an embodiment of the present invention Figure 2 Bottom view of

[0033] Figure 11 Schematic diagram of the folding steps of the air bag body according to an embodiment of the present invention Figure 2 Side view of

[0034] Figure 12 Schematic diagram of the folding steps of the air bag body according to an embodiment of the present invention Figure 3 ;

[0035] Figure 13 Schematic diagram of the folding steps of the air bag body according to an embodiment of the present invention Figure 3 Bottom view of

[0036] Figure 14 Schematic diagram of the folding steps of the air bag body according to an embodiment of the present invention Figure 3Side view of

[0037] Figure 15 Schematic diagram of the folding steps of the air bag body according to an embodiment of the present invention Figure 4 ;

[0038] Figure 16 Schematic diagram of the folding steps of the air bag body according to an embodiment of the present invention Figure 5 ;

[0039] Figure 17 Schematic diagram of the assembly of the airbag body and the airbag box according to an embodiment of the present invention Figure 1 ;

[0040] Figure 18 Schematic diagram of the assembly of the airbag body and the airbag box according to an embodiment of the present invention Figure 2 ;

[0041] Figure 19 Schematic diagram of the assembly of the airbag body and the airbag box according to an embodiment of the present invention Figure 2 sectional view of

[0042] Figure 20 is a schematic structural diagram of a knee airbag structure according to an embodiment of the present invention;

[0043] Figure 21 is a cross-sectional view of a knee airbag structure according to an embodiment of the present invention.

[0044] Reference numerals:

[0045] Knee airbag structure 100,

[0046] Airbag body 1, calf protection portion 11, instep protection portion 12, inner side wall 13, outer side wall 14, side wall body 141, deformation notch 1411, outer side deformation portion 142, inner protection surface 15, outer protection surface 16, inflation port 17, first transverse folding line 18, second transverse folding line 181, first longitudinal folding line 19, second longitudinal folding line 191,

[0047] First drawstring 21, first inner suture 211, first outer suture 212, second drawstring 22, second inner suture 221, second outer suture 222, outer drawstring 23,

[0048] Airbag box 3, ejection port 31, fixing surface 32, airbag box decorative cover 33, tear seam 34,

[0049] Air bag wrapping member 4,

[0050] Guide plate 5, gas generator 6, pre-sewn thread 7,

[0051] Automobile inner guard plate 101, calf 102, foot 103. DETAILED DESCRIPTION

[0052] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0053] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0054] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0055] Unless otherwise specified, the front-to-back direction in this application is the longitudinal direction of the vehicle, that is, the X direction; the left-right direction is the lateral direction of the vehicle, that is, the Y direction; and the up-down direction is the vertical direction of the vehicle, that is, the Z direction.

[0056] Reference below Figures 1-21 A knee airbag structure 100 according to an embodiment of the present invention can protect the calf 102 and foot 103 of an occupant respectively, and enables the airbag body 1 to deploy according to a predetermined deployment direction and path, thereby preventing the airbag body 1 from striking the vehicle inner guard plate 101 or falling toward the occupant's knee during deployment, thereby improving the reliability of the knee airbag structure 100 in protecting the occupant.

[0057] like Figures 1-21 As shown, a knee airbag structure 100 according to an embodiment of the present invention includes an airbag body 1 and at least one airbag drawstring.

[0058] The airbag body 1 includes a calf protection part 11 and an instep protection part 12, which are bent and connected to each other; at least one airbag drawstring is connected to the airbag body 1, and the airbag body 1 is configured to expand the calf protection part 11 and the instep protection part 12 at a set angle under the action of at least one airbag drawstring when inflated.

[0059] Specifically, the knee airbag structure 100 is an important component of the automobile safety system. It is used to inflate and deploy quickly when the vehicle is involved in a head-on collision to form a soft buffer area between the occupant's knees and the vehicle's inner guard plate 101. This helps absorb and disperse collision energy, reducing the impact force on the occupant's knees and lower limbs, thereby reducing the risk of serious injuries such as fractures and ligament tears.

[0060] The knee airbag structure 100 includes an airbag body 1 and an airbag drawstring. The airbag body 1 is used to inflate and expand when the vehicle is involved in a head-on collision to absorb and disperse the collision energy. The airbag drawstring is used to generate a certain pulling force on the airbag body 1 when the airbag body 1 is inflated and expanded, so as to control the expansion direction and expansion posture of the airbag body 1, so that the airbag body 1 can adapt to the gap between the car's inner guard plate 101 and the occupant, thereby improving the reliability of the knee airbag structure 100 in protecting the occupant.

[0061] Among them, the airbag body 1 includes a calf protection part 11 and an instep protection part 12. The calf protection part 11 is used to form a buffer area at the calf 102 of the occupant when the airbag is deployed to protect the calf 102 of the occupant. The instep protection part 12 is used to form a buffer area at the instep of the occupant when the airbag is deployed to protect the foot 103 of the occupant. The calf protection part 11 and the instep protection part 12 are bent and connected to make the airbag body 1 an integral structure, which can reduce the number of airbag bodies 1 and reduce the setting cost. The calf protection part 11 can be bent relative to the instep protection part 12, so that the airbag body 1 can adapt to the trend of the occupant's calf 102 and foot 103 to improve the reliability of protecting the occupant's calf 102 and foot 103, and at the same time, it can also prevent the airbag body 1 from hitting the occupant when deployed, causing secondary injury to the occupant.

[0062] Moreover, there is at least one air bag draw strap, that is, the number of air bag draw straps can be one, two, three or more, and the deployment direction and deployment posture of the air bag can be reliably restricted by at least one air bag draw strap, and at least one air bag draw strap is connected to the air bag main body 1, such as by sewing or bonding, so that the air bag draw strap can control the deployment direction and deployment posture of the air bag main body 1, thereby improving the reliability of the air bag draw strap in controlling the deployment direction and deployment posture of the air bag main body 1.

[0063] Furthermore, the airbag body 1 is configured so that when inflated, the calf protection portion 11 and the instep protection portion 12 are unfolded at a set angle under the action of at least one airbag drawstring. That is, when the airbag body 1 is inflated and unfolded, the calf protection portion 11 and the instep protection portion 12 can be unfolded accordingly, and can form a certain angle under the action of at least one airbag drawstring to adapt to the gap between the car inner guard plate 101 and the occupant, and the calf protection portion 11 and the instep protection portion 12 can be unfolded at a set angle, so that the airbag body 1 can be unfolded in a predetermined direction and path, avoiding the airbag body 1 from hitting the car inner guard plate 101 or falling toward the occupant's knees when unfolding, thereby effectively improving the reliability of the knee airbag structure 100 in protecting the occupant.

[0064] Among them, it should be noted that by making the calf protection part 11 and the instep protection part 12 unfold at a set angle, it is possible to avoid the angle between the calf protection part 11 and the instep protection part 12 being too large or too small. If it is too large, the calf protection part 11 will fall toward the calf 102 of the occupant, and if it is too small, the airbag body 1 will hit the car's inner guard plate 101. Both too large and too small will cause the knee airbag structure 100 to fail to fully play its protective role.

[0065] According to the knee airbag structure 100 of an embodiment of the present invention, the calf protection portion 11 and the instep protection portion 12 are formed on the airbag main body 1, so that the calf 102 and the foot 103 of the occupant can be protected respectively. The airbag main body 1 is configured to expand the calf protection portion 11 and the instep protection portion 12 at a set angle under the action of at least one airbag drawstring when inflated, so that the airbag main body 1 can be expanded according to a predetermined expansion direction and path, thereby preventing the airbag main body 1 from colliding with the automobile inner guard plate 101 or falling toward the occupant's knees during expansion, thereby improving the reliability of the knee airbag structure 100 in protecting the occupant.

[0066] In some embodiments, there are two air bag drawstrings, namely the first drawstring 21 and the second drawstring 22. The first drawstring 21 is located in the instep protection part 12, and the second drawstring 22 is located in the calf protection part 11. When the air bag body 1 is inflated, the first drawstring 21 and the second drawstring 22 act together on the air bag body 1.

[0067] Specifically, there are two airbag draw straps, and the two airbag draw straps are respectively the first draw strap 21 and the second draw strap 22. When the airbag main body 1 is inflated, the first draw strap 21 and the second draw strap 22 act on the airbag main body 1 together, that is, when the airbag main body 1 is inflated and unfolded, the first draw strap 21 and the second draw strap 22 can simultaneously generate tension on the airbag main body 1, that is, the first draw strap 21 and the second draw strap 22 can be used together to control the unfolding direction and unfolding path of the airbag main body 1, which can improve the reliability of the airbag main body 1 unfolding according to the predetermined unfolding direction and path.

[0068] Among them, the first pull strap 21 is arranged in the instep protection part 12, and the second pull strap 22 is arranged in the calf protection part 11, that is, the first pull strap 21 and the second pull strap 22 can be spaced apart and placed inside the airbag body 1, so that the first pull strap 21 and the second pull strap 22 can control the deployment direction and deployment path of the airbag body 1 at two positions at the same time, which can further improve the reliability of controlling the deployment direction and deployment path of the airbag body 1, and the first pull strap 21 and the second pull strap 22 can be connected to the inside of the airbag body 1 at the same time, which can reduce the additional space reserved for the first pull strap 21 and the second pull strap 22, and can reduce the space occupied by the knee airbag structure 100, which is beneficial to the setting of the knee airbag structure 100 on the vehicle.

[0069] In some embodiments, the airbag body 1 has a relatively distributed inner wall 13 and outer wall 14; wherein, one end of the first drawstring 21 is connected to the inner wall 13 to form a first inner suture 211 and the other end is connected to the outer wall 14 to form a first outer suture 212, one end of the second drawstring 22 is connected to the inner wall 13 to form a second inner suture 221 and the other end is connected to the outer wall 14 to form a second outer suture 222, and the distance between the first inner suture 211 and the second inner suture 221 is smaller than the distance between the first outer suture 212 and the second outer suture 222.

[0070] Specifically, the airbag body 1 has relatively distributed inner wall 13 and outer wall 14, the inner wall 13 is a side wall that approaches the inner guard plate 101 of the automobile when the airbag body 1 is deployed, and the outer wall 14 is a side wall that moves away from the inner guard plate 101 of the automobile when the airbag body 1 is deployed, wherein one end of the first drawstring 21 is connected to the inner wall 13 to form a first inner suture line 211 and the other end is connected to the outer wall 14 to form a first outer suture line 212, that is, the end of the first drawstring 21 that is close to the inner guard plate 101 of the automobile is connected to the inner wall 13 through the first inner suture line 211, and the end of the first drawstring 21 that is away from the inner guard plate 101 of the automobile is connected to the outer wall 14 through the first outer suture line 212, and then the first drawstring 21 can be connected to the airbag body 1 at two positions at the same time, which can improve the connection reliability between the first drawstring 21 and the airbag body 1, and can be connected by sewing, and the connection method is simple and reliable.

[0071] One end of the second drawstring 22 is connected to the inner wall 13 to form a second inner suture 221 and the other end is connected to the outer wall 14 to form a second outer suture 222. The end of the second drawstring 22 that is closer to the inner guard plate 101 of the automobile is connected to the inner wall 13 through the second inner suture 221, and the end of the second drawstring 22 that is away from the inner guard plate 101 of the automobile is connected to the outer wall 14 through the second outer suture 222. The second drawstring 22 can be connected to the airbag body 1 at two positions at the same time, which can improve the connection reliability between the second drawstring 22 and the airbag body 1. The drawstring 22 can be connected by sewing, and the connection method is simple and reliable.

[0072] In addition, the distance between the first inner stitching line 211 and the second inner stitching line 221 is smaller than the distance between the first outer stitching line 212 and the second outer stitching line 222, that is, the distance between the connection position of the first drawstring 21 and the inner side wall 13 and the connection position of the second drawstring 22 and the inner side wall 13 is smaller than the distance between the connection position of the first drawstring 21 and the outer side wall 14 and the connection position of the second drawstring 22 and the outer side wall 14. In this way, when the airbag body 1 is inflated and deployed, the airbag body 1 can be bent toward one side of the inner side wall 13, that is, it can be deployed according to a predetermined deployment method, so that the airbag body 1 can be located between the automobile inner guard plate 101 and the occupant, that is, the instep protection part 12 can be located between the automobile inner guard plate 101 and the occupant's foot 103, and the calf protection part 11 can be located between the automobile inner guard plate 101 and the occupant's calf 102, which can protect the occupant's foot 103 and calf 102 respectively, thereby improving the reliability of occupant protection.

[0073] Among them, it should be noted that a special suture fixing technology can be used to fix the airbag drawstring to effectively constrain the deployment posture of the airbag body 1, so that the airbag body 1 can be deployed according to the predetermined deployment direction and path, avoiding problems such as the airbag body 1 being out of control during deployment.

[0074] In some embodiments, the distance between the first inner suture line 211 and the second inner suture line 221 is L1, the distance between the first outer suture line 212 and the second outer suture line 222 is L2, and the relationship 1 / 3≤L1 / L2≤1 / 2 is satisfied.

[0075] Specifically, the relationship between L1 and L2 satisfies: 1 / 3≤L1 / L2≤1 / 2, that is, the ratio of L1 to L2 is between 1 / 3 and 1 / 2, such as 0.38, 0.4 or 0.45, etc., to avoid the ratio of L1 to L2 being too large or too small. When the ratio of L1 to L2 is too large, such as the ratio of L1 to L2 is between 1 / 2 and 2 / 3, the length of L1 is large, which may cause the airbag body 1 to fall toward the occupant's calf 102 during deployment. When the ratio of L1 to L2 is too small, such as the ratio of L1 to L2 is between 0 and 1 / 3, the length of L2 is too large, which may cause the airbag body 1 to hit the car inner guard plate 101 during deployment. In this way, by reasonably designing the ratio of L1 to L2, it can be ensured that the airbag body 1 is deployed in the predetermined deployment direction and path, thereby ensuring the reliability of the knee airbag structure 100.

[0076] It should be noted that by limiting the ratio range of L1 and L2, the setting positions of the first inner suture line 211, the first outer suture line 212, the second inner suture line 221, and the second outer suture line 222 can be restricted, and then the setting positions of the first drawstring 21 and the second drawstring 22 can be restricted, thereby improving the accuracy of the setting positions of the first drawstring 21 and the second drawstring 22, and thereby improving the working reliability of the first drawstring 21 and the second drawstring 22.

[0077] In some embodiments, the distance between the first inner suture 211 and the first outer suture 212 is L3, and satisfies: L2-10mm≤L3≤L2+10mm; and / or, the distance between the second inner suture 221 and the second outer suture 222 is L4, and satisfies: L2-10mm≤L4≤L2+10mm.

[0078] Specifically, the relationship between L3 and L2 satisfies: L2-10mm≤L3≤L2+10mm. For example, L3 can be L2-5mm, L2 or L2+5mm, etc., so that the distance between the connection position of the first drawstring 21 and the inner wall 13 and the connection position of the first drawstring 21 and the outer wall 14 can be limited, and the setting position of the first drawstring 21 can be further limited, thereby improving the accuracy of the setting position of the first drawstring 21, and playing a key role in the force uniformity and shape control when the airbag body 1 is deployed. At the same time, the relationship between L4 and L2 satisfies: L2-10mm≤L4≤L 2+10mm, such as L4 can be L2-5mm, L2 or L2+5mm, etc., which can limit the distance between the connection position of the second drawstring 22 and the inner wall 13 and the connection position of the second drawstring 22 and the outer wall 14, and can further limit the setting position of the second drawstring 22, improve the accuracy of the setting position of the second drawstring 22, and then make the first drawstring 21 and the second drawstring 22 act together on the airbag body 1, further ensure the consistency and coordination of the airbag drawstrings at different positions, so that the airbag body 1 can be unfolded according to the predetermined unfolding direction and path, and ensure the reliability of the airbag body 1.

[0079] In some embodiments, at least a portion of one end of the second draw tape 22 extends to the first inner suture line 211 and is connected to one end of the first draw tape 21 and the inner sidewall 13 .

[0080] Specifically, the first drawstring 21 is connected to the inner side wall 13 to form a first inner suture 211, that is, the first drawstring 21 is connected to the inner side wall 13 at the first inner suture 211, and at least a portion of the second drawstring 22 is extended to the first inner suture 211, so that the second drawstring 22 and one end of the first drawstring 21 can be connected to the inner side wall 13 at the first inner suture 211 at the same time, which can improve the connection reliability between the second drawstring 22 and the airbag body 1, and thus improve the working reliability of the second drawstring 22, and enable at least a portion of the second drawstring 22 to be connected to the first inner suture 211 and the second inner suture 221, so that at least a portion of the second drawstring 22 can limit the deployment direction and deployment path of the airbag body 1 between the first inner suture 211 and the second inner suture 221, which can further ensure that the airbag body 1 can be deployed according to the predetermined deployment direction and path.

[0081] It should be noted that the distance between the first inner suture line 211 and the second inner suture line 221 is equal to the length of the portion of the second draw tape 22 located between the first inner suture line 211 and the second inner suture line 221 .

[0082] In some embodiments, the outer wall 14 includes a side wall body 141 and an outer deformation portion 142, the side wall body 141 is formed with a deformation notch 1411, and the outer deformation portion 142 is connected to the deformation notch 1411; wherein, at least a portion of the other end of the first pull strap 21 is sewn between one side edge of the deformation notch 1411 and one side edge of the outer deformation portion 142, and at least a portion of the other end of the second pull strap 22 is sewn between the other side edge of the deformation notch 1411 and the other side edge of the outer deformation portion 142.

[0083] Specifically, the outer side wall 14 includes a side wall body 141 and an outer deformation portion 142. The side wall body 141 is used to contact the occupant's calf 102 or foot 103 when the airbag body 1 is deployed to protect the occupant. The outer deformation portion 142 is used to allow the airbag body 1 to bend here when deployed, so that the airbag body 1 can adapt to the tendencies of the occupant's calf 102 and foot 103. A deformation notch 1411 is formed in the side wall body 141, and the outer deformation portion 142 is connected to the deformation notch 1411, so that the connection between the side wall body 141 and the outer deformation portion 142 can be achieved, making the outer side wall 14 a whole, and avoiding the airbag body 1 from having too large a thickness at the outer deformation portion 142, which is not conducive to the bending of the airbag body 1.

[0084] Among them, at least part of the other end of the first pull strap 21 is sewn between one side edge of the deformation notch 1411 and one side edge of the outer deformation part 142, and at least part of the other end of the second pull strap 22 is sewn between the other side of the deformation notch 1411 and the other side edge of the outer deformation part 142, so that the other end of the first pull strap 21 can be connected to the side wall body 141 and the outer deformation part 142 at the same time, which can improve the connection reliability between the other end of the first pull strap 21 and the outer wall 14, and the other end of the second pull strap 22 can be connected to the side wall body 141 and the outer deformation part 142 at the same time, which can improve the connection reliability between the other end of the second pull strap 22 and the outer wall 14, thereby improving the working reliability of the first pull strap 21 and the second pull strap 22.

[0085] The outer deformation portion 142 can be connected between the other end of the first drawstring 21 and the other end of the second drawstring 22, so that the outer deformation portion 142 can separate the other end of the first drawstring 21 from the other end of the second drawstring 22, thereby enabling the first drawstring 21 and the second drawstring 22 to act on the airbag body 1 at two positions at the same time, thereby improving the reliability of the airbag body 1 being unfolded in a predetermined unfolding direction and path under the action of the first drawstring 21 and the second drawstring 22.

[0086] In some embodiments, one air bag drawstring is provided, which is provided on the outside of the air bag body 1 and is constructed as an external drawstring 23 , one end of the external drawstring 23 is connected to the calf protection portion 11 and the other end is connected to the instep protection portion 12 .

[0087] Specifically, there is one air bag drawstring, which can be used to control the deployment direction and deployment path of the air bag body 1. The air bag drawstring is set outside the air bag body 1 and is constructed as an external drawstring 23, so that the external drawstring 23 can apply a certain pulling force to the air bag body 1 from the outside of the air bag body 1, thereby allowing the air bag body 1 to be deployed according to the predetermined deployment direction and deployment path. In addition, one end of the external drawstring 23 is connected to the calf protection part 11 and the other end is connected to the instep protection part 12, so that the external drawstring 23 can generate a certain pulling force on the airbag body 1 between the calf protection part 11 and the instep protection part 12, and then the calf protection part 11 can be bent relative to the instep protection part 12, that is, a certain angle can be formed between the calf protection part 11 and the instep protection part 12. In this way, the airbag body 1 can adapt to the trends of the occupant's calf 102 and foot 103, better protect the occupant's calf 102 and foot 103, and improve the reliability of the airbag body 1 in protecting the occupant.

[0088] In some embodiments, the airbag body 1 has an inner protection surface 15 facing the inner guard plate 101 of the automobile and an outer protection surface 16 facing the occupant, and both ends of the external drawstring 23 are connected to the inner protection surface 15 .

[0089] Specifically, the inner protective surface 15 is the side facing the inner guard plate 101 of the automobile, and the outer protective surface 16 is the side facing the occupant. By connecting both ends of the external pull strap 23 to the inner protective surface 15, both ends of the external pull strap 23 can be connected to the side of the airbag body 1 facing the inner panel of the automobile, so that the external pull strap 23 can generate a certain pulling force on the airbag body 1 on the inner side of the airbag body 1 to limit the deployment length of the part of the airbag body 1 located between the two ends of the external pull strap 23, and then the airbag body 1 can be bent toward one side of the inner guard plate 101 of the automobile when deployed to adapt to the tendency of the occupant's calf 102 and foot 103, thereby better protecting the occupant's calf 102 and foot 103.

[0090] It should be noted that the first pull strap 21 and the second pull strap 22 can act together on the inside of the airbag body 1, so that the airbag body 1 can be unfolded according to the predetermined unfolding direction and unfolding path, and the external pull strap 23 can act on the outside of the airbag body 1, so that the airbag body 1 can be unfolded according to the predetermined unfolding direction and unfolding path. In practice, only the first pull strap 21 and the second pull strap 22, or only the external pull strap 23, or the first pull strap 21, the second pull strap 22 and the external pull strap 23 can be selectively set, all of which can effectively control the unfolding direction and unfolding path of the airbag body 1 to ensure that the airbag body 1 can effectively protect the occupants.

[0091] In some embodiments, the knee airbag structure 100 further includes an airbag box 3 . The airbag body 1 is adapted to be stored in the airbag box 3 after being folded. The airbag box 3 has an ejection port 31 , and the airbag body 1 is adapted to be ejected directionally from the ejection port 31 .

[0092] Specifically, the airbag box 3 can be constructed as a box so that it has a certain volume, which can be used to accommodate and protect the airbag body 1, avoiding damage and failure caused by friction between the airbag body 1 and external structural parts, and the airbag box 3 can be made of engineering plastics or composite materials, so that the airbag box 3 can have a certain strength, thereby improving its reliability in protecting the airbag body 1. Moreover, the airbag body 1 is placed in the airbag box 3 after folding, and the airbag body 1 can be folded according to a certain method first, and then the airbag body 1 is set in the airbag box 3 after folding. This can reduce the space occupied by the airbag body 1 and the volume of the airbag box 3, thereby reducing the space occupied by the airbag box 3 on the vehicle, which is conducive to the setting of the airbag box 3 on the vehicle.

[0093] In addition, the airbag box 3 has an ejection outlet 31, which is constructed to open toward the outside of the airbag box 3, so that the airbag body 1 located inside the airbag box 3 can be directionally ejected from the ejection outlet 31 when inflated and deployed, that is, the ejection outlet 31 can be used to control the deployment direction of the airbag body 1. In practice, the deployment direction of the airbag body 1 can be adjusted by changing the setting position of the ejection outlet 31, which can further ensure the accuracy of the deployment direction of the airbag body 1.

[0094] In some embodiments, a fixed surface 32 is provided at the top of the airbag box 3, and an ejection port 31 is provided at the bottom of the airbag box 3. The airbag body 1 ejects from the ejection port 31 toward the rear and bottom. The angle between the extension direction of at least a portion of the end of the airbag body 1 away from the inflation port 17 in the airbag box 3 and the fixed surface 32 is α, and satisfies the following conditions: 35°≤α≤45°.

[0095] Specifically, if Figure 4-Figure 7 As shown, after the airbag box 3 is installed on the vehicle, the airbag box 3 has a top and a bottom in the up and down direction. A fixing surface 32 is provided on the top of the airbag box 3. The fixing surface 32 is located inside the airbag box 3 and is used to connect the airbag body 1 to achieve the connection between the airbag box 3 and the airbag body 1, ensuring that the airbag body 1 will not fall out of the airbag box 3 during the driving of the vehicle. The ejection outlet 31 is provided at the bottom of the airbag box 3, so that the airbag body 1 can be ejected from the ejection outlet 31 toward the rear and bottom, that is, toward the direction where the occupant is located, and can bend upward during the ejection process to provide reliable protection for the occupant.

[0096] Moreover, the angle α between the extension direction of at least a portion of the end of the airbag main body 1 away from the inflation port 17 in the airbag box 3 and the fixing surface 32 is between 35° and 45°, such as 37°, 40° or 42°, and the airbag main body 1 can be operated by folding and pressing to adjust the angle between the extension direction of at least a portion of the end of the airbag main body 1 away from the inflation port 17 in the airbag box 3 and the fixing surface 32, so that the deployment direction of the airbag main body 1 can be further controlled to improve the accuracy of the deployment direction of the airbag main body 1.

[0097] It should be noted that, Figure 20-21 As shown, the airbag box 3 is connected to an airbag box decorative cover 33, which is suitable for being connected to the ejection outlet 31 to seal the airbag box 3, thereby improving the reliability of protecting the airbag body 1 and preventing the airbag body 1 from falling. At the same time, the airbag box decorative cover 33 can be constructed into a U shape, and a tear seam 34 is formed on the side of the airbag box decorative cover 33 away from the inflation port 17. The tear seam 34 is used to reduce the resistance of the airbag body 1 when it is deployed, so as to facilitate the deployment of the airbag body 1. Setting α between 35° and 45° can facilitate the airbag body 1 to be away from the inflation port 17 when it is inflated. The end away from the inflation port 17 can directly rush towards the tear seam 34 of the airbag box decorative cover 33, break through the tear seam 34 and deploy from the ejection port 31, which can greatly shorten the deployment time of the airbag main body 1, significantly accelerate the deployment speed of the airbag main body 1, and improve the protection effect on the occupant. It can also avoid that the angle between the extension direction of at least part of the end of the airbag main body 1 away from the inflation port 17 in the airbag box 3 and the fixing surface 32 is too large or too small. If the angle is too large or too small, the airbag main body 1 may not be able to rush to the tear seam 34, which may cause the airbag main body 1 to fail to deploy normally.

[0098] In some embodiments, the airbag body 1 is provided with an inflation port 17, and the airbag body 1 has a first transverse folding line 18 and a second transverse folding line 181 spaced apart along the length direction, and the airbag body 1 is suitable for folding from the end away from the inflation port 17 to the first transverse folding line 18, and then folding from the end located at the first transverse folding line 18 to the second transverse folding line 181; and, the airbag body 1 also has a first longitudinal folding line 19 and a second longitudinal folding line 191 spaced apart along the width direction, and both sides of the airbag body 1 are suitable for folding inward along the first longitudinal folding line 19 and the second longitudinal folding line 191, respectively.

[0099] Specifically, the airbag body 1 is used to expand when inflated to form a buffer between the occupant and the car inner guard plate 101. The airbag body 1 is provided with an inflation port 17, which is used to allow external gas to enter the airbag body 1 so that the airbag body 1 can be inflated and expanded to protect the occupant. Figure 9 and Figure 12As shown, at least a portion of the gas generator 6 can be extended from the inflation port 17 into the interior of the airbag body 1 so that the gas generator 6 can inflate the airbag body 1 .

[0100] In addition, the airbag body 1 has a first transverse folding line 18 and a second transverse folding line 181 spaced apart along the length direction, and the length direction is a direction extending along the unfolding direction of the airbag body 1. The first transverse folding line 18 and the second transverse folding line 181 can both be used to mark the folding position of the airbag body 1, so that the installer or maintenance personnel can fold the airbag body 1 into a size that adapts to the length of the airbag box 3, which can improve the convenience of operation. The first transverse folding line 18 and the second transverse folding line 181 are spaced apart so that the first transverse folding line 18 and the second transverse folding line 181 can be marked from different positions, further improving the convenience of operation and avoiding repeated folding.

[0101] The airbag body 1 is suitable for being folded from the end away from the inflation port 17 to the first transverse folding line 18, and then folded from the end located at the first transverse folding line 18 to the second transverse folding line 181, that is, Figure 8 As shown, the airbag body 1 can be folded starting from the end away from the inflation port 17, and the end away from the inflation port 17 can be folded first to coincide with the first transverse folding line 18, and then the folded parts can be aligned, and then folded along the first transverse folding line 18, and then folded multiple times according to actual conditions until it is folded to the second transverse folding line 181. Through this process, the space occupied by the airbag body 1 along the length direction can be reduced.

[0102] It should be noted that if Figure 8 As shown, the first transverse folding line 18 and the second transverse folding line 181 are arranged on a side of the airbag main body 1 opposite to the outer deformation part 142. When the airbag main body 1 is folded along the length direction to the second transverse folding line 181, the outer deformation part 142 is just exposed. At this time, the part of the outer deformation part 142 extending out of the airbag main body 1 can be folded upward to make the edge of the airbag main body 1 neat, and after folding, the airbag main body 1 can be fixed with a pre-stitched line 7 to maintain the folded shape of the airbag main body 1. The pre-stitched line 7 can be made of specially treated materials with unique strength and toughness. During the unfolding process of the airbag main body 1, the pre-stitched line 7 can be accurately broken in a pre-designed manner to assist in controlling the unfolding of the airbag main body 1 and ensure that the airbag main body 1 can be unfolded in a predetermined direction and path.

[0103] At the same time, the airbag body 1 also has a first longitudinal folding line 19 and a second longitudinal folding line 191 spaced apart along the width direction. The width direction is a direction perpendicular to the length direction. The first longitudinal folding line 19 and the second longitudinal folding line 191 can both be used to mark the folding position of the airbag body 1, so that the installer or maintenance personnel can fold the airbag body 1 into a size that adapts to the width of the airbag box 3, which can improve the convenience of operation. The first longitudinal folding line 19 and the second longitudinal folding line 191 are spaced apart and distributed so that the first longitudinal folding line 19 and the second longitudinal folding line 191 can be marked from different positions, further improving the convenience of operation and avoiding repeated folding.

[0104] The two sides of the air bag body 1 are adapted to be folded inwards along the first longitudinal folding line 19 and the second longitudinal folding line 191, respectively. Figure 9-10 As shown, after the airbag body 1 is folded along the length direction to the second transverse folding line 181, the left and right sides of the airbag body 1 can be folded inward along the first longitudinal folding line 19 and the second longitudinal folding line 191 respectively, and then half of the two inward folded parts are folded outward. Through this process, the space occupied by the airbag body 1 along the width direction can be reduced, that is, the space occupied by the airbag body 1 can be reduced.

[0105] In some embodiments, an airbag tightening member 4 is connected to one end of the airbag body 1 close to the inflation port 17 . The airbag tightening member 4 is adapted to tighten the airbag body 1 after the airbag body 1 is folded.

[0106] Specifically, the air bag tightening member 4 is used to tighten the air bag main body 1 after the air bag main body 1 is folded, that is, the air bag tightening member 4 can wrap the air bag main body 1 to prevent the air bag main body 1 from loosening after folding. The air bag tightening member 4 is set at one end of the air bag main body 1 close to the inflation port 17, which can prevent the air bag main body 1 from wrapping the air bag tightening member 4 during the folding process, and can help reduce the setting length of the air bag tightening member 4 and reduce the setting cost.

[0107] like Figure 11-14 As shown, after the airbag body 1 is folded along the first longitudinal folding line 19 and the second longitudinal folding line 191, the airbag body 1 can be folded backward to expose the inflation port 17, and then the airbag wrapping member 4 is used to wrap the airbag body 1 from the back side.

[0108] It should be noted that if Figures 15-19As shown, after the airbag wrapping member 4 has wrapped the airbag body 1, a layer of guide sheet 5 can be set on the outside of the airbag wrapping member 4 and then installed into the airbag box 3. The surface of the guide sheet 5 is relatively smooth to reduce the friction between the airbag body 1 and the airbag box 3, and assist in the deployment of the airbag body 1. The guide sheet 5 can also be used to fill the assembly gap between the wrapped airbag body 1 and the airbag box 3 to ensure that the deployment path of the airbag body 1 is smooth.

[0109] As well as Figure 6 and Figure 7 As shown, the distance between the gas generator 6 and the first outer suture line 212 is D1, and the length of a section of the automobile inner guard plate 101 close to the airbag box 3 is D2. In practice, the lengths of D1 and D2 can be accurately designed to ensure the smooth deployment of the airbag body 1 and improve the reliability of the operation of the airbag body 1.

[0110] The present invention also provides a vehicle.

[0111] According to an embodiment of the present invention, a vehicle includes an automobile inner guard plate 101 and a knee airbag structure 100 according to any one of the above embodiments. The airbag body 1 is suitable for being stored on the inner side of the automobile inner guard plate 101, and after being deployed, the airbag body 1 is suitable for extending between the automobile inner guard plate 101 and the occupant.

[0112] Among them, the function of the automobile inner guard plate 101 is to cover the internal structural parts of the automobile. The airbag body 1 is stored on the inner side of the automobile inner guard plate 101, and the airbag box 3 can be installed on the inner side of the automobile inner guard plate 101, so that the automobile inner guard plate 101 can cover the airbag box 3 to prevent it from being exposed to the outside, and the airbag body 1 can extend between the automobile inner guard plate 101 and the occupant after deployment, forming a buffer between the automobile inner guard plate 101 and the occupant to protect the occupant, and the airbag body 1 includes a calf protection part 11 and an instep protection part 12. After the airbag body 1 is deployed, the calf protection part 11 can be located between the automobile inner guard plate 101 and the occupant's calf 102, and the instep protection part 12 can be located between the automobile inner guard plate 101 and the occupant's foot 103, which can protect the occupant's calf 102 and foot 103 respectively, thereby improving the reliability of occupant protection.

[0113] In addition, the airbag body 1 is connected to an airbag drawstring, which is used to control the deployment direction and deployment path of the airbag to ensure that the airbag body 1 can be deployed in a predetermined direction and path, and to prevent the airbag body 1 from hitting the car's inner guard plate 101 or falling toward the occupant's calf 102 during deployment, thereby improving the reliability of the airbag body 1 in protecting the occupant.

[0114] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0115] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A knee airbag structure, characterized in that: include: An air bag body (1), the air bag body (1) comprising a calf protection portion (11) and an instep protection portion (12), the calf protection portion (11) and the instep protection portion (12) being connected in a bent manner; At least one air bag drawstring is connected to the air bag body (1), and the air bag body (1) is configured to expand the calf protection portion (11) and the instep protection portion (12) at a set angle under the action of the at least one air bag drawstring when inflated.

2. The knee airbag structure according to claim 1, characterized in that: There are two air bag drawstrings, namely a first drawstring (21) and a second drawstring (22). The first drawstring (21) is located in the instep protection part (12), and the second drawstring (22) is located in the calf protection part (11). When the air bag body (1) is inflated, the first drawstring (21) and the second drawstring (22) act together on the air bag body (1).

3. The knee airbag structure according to claim 2, characterized in that: The air bag body (1) has an inner side wall (13) and an outer side wall (14) that are relatively distributed; Wherein, one end of the first drawstring (21) is connected to the inner wall (13) to form a first inner suture (211) and the other end is connected to the outer wall (14) to form a first outer suture (212); one end of the second drawstring (22) is connected to the inner wall (13) to form a second inner suture (221) and the other end is connected to the outer wall (14) to form a second outer suture (222); the distance between the first inner suture (211) and the second inner suture (221) is smaller than the distance between the first outer suture (212) and the second outer suture (222).

4. The knee airbag structure according to claim 3, characterized in that: The distance between the first inner suture (211) and the second inner suture (221) is L1, the distance between the first outer suture (212) and the second outer suture (222) is L2, and the relationship 1 / 3≤L1 / L2≤1 / 2 is satisfied.

5. The knee airbag structure according to claim 4, characterized in that: The distance between the first inner suture line (211) and the first outer suture line (212) is L3, and satisfies: L2-10mm≤L3≤L2+10mm; And / or, the distance between the second inner suture line (221) and the second outer suture line (222) is L4, and satisfies: L2-10mm≤L4≤L2+10mm.

6. The knee airbag structure according to claim 3, characterized in that: At least a portion of one end of the second drawstring (22) extends to the first inner suture line (211), and is connected to one end of the first drawstring (21) and the inner side wall (13).

7. The knee airbag structure according to claim 3, characterized in that: The outer side wall (14) comprises a side wall body (141) and an outer deformation portion (142); the side wall body (141) is formed with a deformation notch (1411); and the outer deformation portion (142) is connected to the deformation notch (1411); Wherein, at least a portion of the other end of the first drawstring (21) is sewn between one side edge of the deformation notch (1411) and one side edge of the outer deformation portion (142), and at least a portion of the other end of the second drawstring (22) is sewn between the other side edge of the deformation notch (1411) and the other side edge of the outer deformation portion (142).

8. The knee airbag structure according to claim 1, characterized in that: The air bag drawstring is provided as one, and the air bag drawstring is provided outside the air bag body (1) and is constructed as an external drawstring (23), one end of the external drawstring (23) is connected to the calf protection part (11) and the other end is connected to the instep protection part (12).

9. The knee airbag structure according to claim 8, characterized in that: The airbag body (1) has an inner protection surface (15) facing the inner guard plate (101) of the automobile and an outer protection surface (16) facing the occupant, and both ends of the external drawstring (23) are connected to the inner protection surface (15).

10. The knee airbag structure according to claim 1, characterized in that: It also includes an airbag box (3), wherein the airbag body (1) is suitable for being stored in the airbag box (3) after being folded, and the airbag box (3) has an ejection port (31), and the airbag body (1) is suitable for being ejected directionally from the ejection port (31).

11. The knee airbag structure according to claim 10, characterized in that: A fixing surface (32) is provided at the top of the airbag box (3), and the ejection port (31) is provided at the bottom of the airbag box (3). The airbag body (1) ejects from the ejection port (31) toward the rear and downward direction. An angle α is formed between an extension direction of at least a portion of an end of the airbag body (1) away from the inflation port (17) in the airbag box (3) and the fixing surface (32), and the angle satisfies the following conditions: 35°≤α≤45°.

12. The knee airbag structure according to claim 10, characterized in that: The air bag body (1) is provided with an inflation port (17), and the air bag body (1) has a first transverse folding line (18) and a second transverse folding line (181) spaced apart along the length direction, and the air bag body (1) is suitable for being folded from an end away from the inflation port (17) to the first transverse folding line (18), and then being folded from an end located at the first transverse folding line (18) to the second transverse folding line (181); Furthermore, the airbag body (1) further comprises a first longitudinal folding line (19) and a second longitudinal folding line (191) spaced apart in the width direction, and both sides of the airbag body (1) are adapted to be folded inwardly along the first longitudinal folding line (19) and the second longitudinal folding line (191), respectively.

13. The knee airbag structure according to claim 12, characterized in that: An air bag tightening member is connected to one end of the air bag body (1) close to the inflation port (17), and the air bag tightening member is suitable for tightening the air bag body (1) after the air bag body (1) is folded.

14. A vehicle, characterized in that: The invention comprises an automobile inner guard plate (101) and a knee airbag structure according to any one of claims 1 to 13, wherein the airbag body (1) is adapted to be accommodated inside the automobile inner guard plate (101), and the airbag body (1) is adapted to extend between the automobile inner guard plate (101) and an occupant after being deployed.

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