Knee airbag pocket and knee airbag module assembly

Abstract

The utility model relates to the field of automobile safety technology, and specifically relates to a knee air bag and a knee air bag module assembly, and the segmented external pull belt is sewn simply, can play better restraint effect to the air bag in the process of point explosion, makes the air bag unfold along the instrument board, and better protects the passenger's leg. Adopting the air guide device, the air guide device reduces the pressure of the air bag sewing place, improves the unfolding time, avoids the air bag bag piece of the air outlet of the generator from being scalded. The length of the segmented external pull belt controls the angle between the first chamber and the second chamber when the air bag unfolds, greatly improves the application range of the knee air bag, and no matter whether the knee air bag is split type or integral type, the utility model structure can be adopted; the utility model can directly open the hanging hole on the existing shell on the basis of not replacing the shell, other structures and the like, carries out production installation, reduces the production difficulty, and improves the installation convenience.

Description

Technical Field

[0001] This utility model relates to the field of automotive safety technology, specifically to knee airbags and knee airbag module assemblies. Background Technology

[0002] Airbags are a crucial component of a car's passive safety system. They work in conjunction with seat belts to provide effective collision protection for occupants. As a safety device within a car's passive restraint system, an airbag deploys instantaneously in the event of a collision, protecting the safety of the occupants. When deployed, the airbag inflates, separating the occupants from the steering wheel or dashboard, thus safeguarding their safety.

[0003] During a car collision, the knee is the closest point to the center console, making it the most vulnerable to fractures. However, existing knee airbag modules suffer from drawbacks such as incomplete deployment, slow deployment time, excessive deployment angle, high cost, and difficulty in installation. To address these issues, the inventor of this utility model has developed a segmented external pull strap. This strap is easy to sew and can better restrain the airbag during deployment, allowing it to deploy along the dashboard and better protect the passenger's legs. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a knee airbag and a knee airbag module assembly.

[0005] The technical solution adopted by this utility model to solve its technical problem is: A knee airbag includes a first chamber and a second chamber, which are independent of each other and connected by sewing at an overlap. The first chamber, when inflated, has a smaller volume than the second chamber. An outer covering is sewn to the outside of the first chamber. This outer covering wraps around the airbag body after folding and is then hung on a generator stud. The generator's outlet is connected to the first chamber. A segmented external pull strap is provided on the side of the first chamber. The outer ends of the segmented external pull strap are folded and sewn to form hook structures for fixing to the shell. During inflation, the first chamber pops out before the second chamber and supports the second chamber. The segmented external pull strap constrains the first chamber during inflation, thus changing the deployment angle between the first and second chambers. After inflation, both the first and second chambers are positioned with one side close to the dashboard and the other side close to the passenger's knee, providing protection for the passenger's knee.

[0006] As a preferred embodiment, a further technical solution of this utility model is: Preferably, multiple openings are provided at the overlap between the first chamber and the second chamber, and air guide gaskets are provided at the openings.

[0007] Preferably, the first chamber is made of one piece of fabric spliced ​​and sewn together, and has a staggered reinforcing plate inside. The first chamber and the reinforcing plate are provided with insertion holes for the generator to pass through, and the first chamber is also provided with an exit hole for the generator stud to pass through.

[0008] Preferably, the second chamber is made of a single piece of fabric sewn together, and has multiple perforated pull straps inside, with different positions and sizes among the perforated pull straps.

[0009] Preferably, segmented external pull straps are provided on both the left and right sides of the first chamber, and the lengths of the segmented external pull straps on both sides are the same.

[0010] Preferably, the outer sheath is provided with an opening that matches the generator stud.

[0011] Preferably, the openings on each perforated pull belt include a central circular opening and two side waist-shaped openings.

[0012] This utility model also discloses a knee airbag module assembly, including the above-mentioned knee airbag, generator, and air guiding device. The air guiding device is sleeved on one end of the generator's air outlet. After the generator is sleeved with the air guiding device, it is inserted into the first chamber of the airbag body, and the generator stud extends outward from the first chamber. The airbag body is folded and wrapped with an outer cover, and then hung on the generator through the outer cover.

[0013] Preferably, the air guiding device has a U-shaped slot structure, and the outer end of the air guiding device has a blocking part to block part of the generator air outlet.

[0014] Preferably, it also includes a housing and a cover; the housing has an overall structure with an opening on one side, and the housing is provided with a fixing hole adapted to the generator stud and an installation hole adapted to the segmented external pull strap hook structure. The air bag body together with the generator is installed in the housing through the fixing hole and the installation hole, and the cover is placed on the opening of the housing, and the cover is provided with a tear line.

[0015] Compared with the prior art, the present utility model adopting the above technical solution has the following outstanding features: Featuring low price, high stability, high applicability, and easy installation, this invention simplifies the sewing of segmented external pull straps compared to existing patents. It provides better restraint of the airbag during deployment, allowing it to unfold along the dashboard for improved passenger leg protection. An air guiding device reduces pressure at the airbag sewing points, increases deployment time, and prevents burns to the airbag flap at the generator outlet. The length of the segmented external pull straps controls the angle between the first and second chambers during airbag deployment, significantly expanding the applicability of knee airbags. This design can be used for both single-chamber and multi-chamber knee airbags. Furthermore, this invention allows for production and installation by directly creating hanging holes in existing housings without replacing the shell, cover, or other structures, reducing production difficulty and improving installation convenience. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of the shell in an embodiment of this utility model; Figure 2 This is a three-dimensional structural diagram of the shell in an embodiment of this utility model; Figure 3 This is a schematic diagram of the air guiding device in an embodiment of this utility model; Figure 4 This is a schematic diagram of the segmented external pull strap in an embodiment of this utility model; Figure 5 This is a schematic diagram of the structure of the decorative cover in an embodiment of this utility model; Figure 6 This is a schematic diagram of the installation state of the air guiding device in an embodiment of this utility model; Figure 7 This is a schematic diagram of the air bag body before folding in an embodiment of this utility model; Figure 8 This is a schematic diagram of the cross-sectional view of the air bag body before folding in an embodiment of this utility model; Figure 9 This is a schematic diagram of the integrated external pull strap structure in an embodiment of this utility model. Figure 1 ; Figure 10 This is a schematic diagram of the segmented external pull strap structure in an embodiment of this utility model. Figure 2 ; Figure 11 This is a schematic diagram of the segmented external pull strap installation in an embodiment of this utility model; Figure 12 This is a schematic diagram of the knee airbag module assembly in an embodiment of this utility model; Figure 13 This is a cross-sectional view of the knee airbag module assembly in an embodiment of this utility model; Figure 14This is a cross-sectional view of the first chamber in an embodiment of this utility model; Figure 15 This is a cross-sectional view of the second chamber in an embodiment of this utility model; Figure 16 This is a schematic diagram of different lengths of segmented external pull straps and unfolding angles in an embodiment of this utility model. Figure a shows the unfolding effect of the external short pull strap airbag, Figure b shows the unfolding effect of the external long pull strap airbag, and Figure c shows a comparison of unfolding angles.

[0017] Explanation of reference numerals in the attached drawings: 1. Housing; 2. Air guiding device; 3. Segmented external pull strap; 4. Decorative cover; 5. Generator; 101. Mounting hook; 102. Mounting bracket; 103. Fixing hole; 104. Mounting hole; 201. Bolt fixing hole; 401. Fixing hanging hole; 402. Tear line; 702. Circular opening; 703. Waist-shaped opening; 704. Air vent gasket; 801. Integrated external pull strap; 802. Split external pull strap; 901. Hook structure; 111. Reinforcing plate; 121. Perforated pull strap. Detailed Implementation

[0018] The present invention will be further described below with reference to specific embodiments. The purpose of this description is only to better understand the content of the present invention. Therefore, the examples given do not limit the scope of protection of the present invention.

[0019] like Figures 1 to 16 As shown in the figure, this embodiment provides a knee airbag. The airbag body includes a first chamber and a second chamber that are independent of each other. The first chamber and the second chamber are connected by sewing at their overlapping part. The volume of the first chamber after inflation is smaller than that of the second chamber. An outer covering is sewn to the outside of the first chamber. The outer covering is used to wrap the airbag body after it is folded, and then hang the airbag body on the stud of the generator 5. The air outlet of the generator 5 is connected to the first chamber. A segmented external pull strap 3 is provided on the side of the first chamber. The outer end of the segmented external pull strap 3 is folded and sewn to form a hook structure 901. The hook structure 901 is used to fix it to the shell 1. When inflated, the first chamber pops out first before the second chamber and supports the second chamber. The segmented external pull strap 3 constrains the first chamber during inflation, thereby changing the unfolding angle between the first chamber and the second chamber. After inflation, both the first chamber and the second chamber are close to the dashboard on one side and close to the passenger's knee on the other side, thus protecting the passenger's knee.

[0020] In implementation, the segmented external pull strap 3 can be configured as an integrated external pull strap 801 or a split external pull strap 802. Both configurations include a hook structure 901, which engages with the mounting holes 104 of the housing 1 to fix the segmented external pull strap 3 to the housing 1 and restrict displacement. For different vehicle models, the airbag deployment angle and the angle between the first and second chambers can be adjusted by changing the length of the segmented external pull strap 3, thereby improving applicability.

[0021] The position, shape, length, and other appearance elements of the segmented external pull strap 3, without altering the structure, can be determined according to the actual situation of the vehicle's dashboard. After the outer wrapping sheet covers the air bag body, it can be hung on the stud of the generator 5, or fixed by means of adhesive, sewing, etc.

[0022] Multiple openings are provided at the overlapping area between the first chamber and the second chamber, and air guide gaskets 704 are provided at the openings. The air guide gaskets 704 are set along the edge of the openings and mainly serve to strengthen and guide air. The shape, size, opening method, and sewing method of the air guide gaskets 704 can be adjusted and optimized according to the actual situation.

[0023] The first chamber is symmetrically sewn from a single piece of fabric and has an offset reinforcing plate 111 inside. The first chamber and the reinforcing plate 111 are provided with insertion holes for the generator 5 to pass through, and the first chamber is also provided with an exit hole for the stud of the generator 5 to pass through. The offset reinforcing plate 111 is used to prevent the generator insertion hole from leaking or being damaged during the ignition process. The shape, size, opening method, and sewing method of the offset reinforcing plate 111 can be adjusted and optimized according to the actual situation.

[0024] The second chamber is made of a single piece of fabric symmetrically sewn together, and has multiple perforated pull straps 121 inside, with different positions and sizes among the perforated pull straps 121.

[0025] The first chamber is equipped with segmented external pull straps 3 on both the left and right sides, and the segmented external pull straps 3 on both sides are the same length.

[0026] The outer sheath has openings that are compatible with the generator stud 5.

[0027] The openings on each perforated pull belt 121 include a central circular opening 702 and two side waist-shaped openings 703; ensuring that when the generator produces gas at 5 points, the middle and sides of the knee airbag are inflated simultaneously, and the overall arrival time of the airbag is consistent, and the opening positions of the circular openings 702 and waist-shaped openings 703 between the multiple perforated pull belts 121 are the same.

[0028] In actual production, the quantity of the porous strap 121, the air duct gasket 704, and the reinforcing plate 111 used to improve the strength and air conduction of the airbag can be adjusted according to the airbag volume, fabric strength, and detonation power of the generator 5.

[0029] This utility model also discloses a knee airbag module assembly, including the above-mentioned knee airbag, generator 5 and air guiding device 2. The air guiding device 2 is sleeved on one end of the air outlet of generator 5. After generator 5 is sleeved with air guiding device 2, it enters the first chamber of airbag body, and the stud of generator 5 extends outward from the first chamber. After airbag body is folded and wrapped by outer packaging piece, it is hung on the stud of generator 5 by outer packaging piece.

[0030] In implementation, the air guiding device 2 has a U-shaped slot structure. The outer end of the air guiding device 2 has a shielding part to block part of the air outlet of the generator 5. The air guiding device 2 is provided with bolt fixing holes 201 for the generator 5 studs to pass through, to strengthen the secure fixation to the generator 5. By blocking part of the air outlet of the generator 5, the air guiding device 2 directs the gas uniformly to the second chamber. This reduces pressure at the airbag seam, increases the deployment time, and prevents burns to the airbag pouch at the generator outlet. The shape, length, and other appearance elements of the air guiding device 2 that do not alter the structure can be determined according to the actual situation of the knee airbag.

[0031] It also includes a housing 1 and a cover 4; the housing 1 has an overall structure with an opening on one side. The housing 1 is provided with a fixing hole 103 that is adapted to the stud of the generator 5 and an installation hole 104 that is adapted to the hook structure 901 of the segmented external pull strap 3. The air bag body together with the generator 5 is installed in the housing 1 through the fixing hole 103 and the installation hole 103. The cover 4 is placed on the opening of the housing 1 and has a tear line 402.

[0032] After the airbag is folded and placed into the housing 1, it is hung on the mounting hook 101 of the housing 1 through the fixing hole 401 of the cover 4 to complete the assembly installation of the module; the cover is provided with a cover tear line 402 for the airbag to unfold from the tear line 402 when it is deployed, to constrain the airbag deployment posture, and to optimize the airbag deployment time. The number, shape and size of the fixing hole 401 and the mounting hook 101 can be modified according to the actual installation situation of the vehicle dashboard.

[0033] During actual installation, first, the air guide device 2 is placed on the generator 5 and inserted through the through hole on the first chamber via the staggered reinforcing plate 111. The generator 5 stud is inserted through the through hole on the first chamber. After the airbag is folded, the airbag is wrapped with an outer cover and the opening on the outer cover is hung on the generator 5 stud. Then, the generator 5 stud is inserted into the fixing hole 103 on the housing 1. A nut is used to lock the generator stud to the outside of the fixing hole 103. The hook structure 901 of the segmented external pull strap 3 passes through the mounting hole 104 and is hung on the mounting hole 104. The module assembly is then hung on the mounting hook 101 on the housing 1 through the fixing hanging hole 401 of the cover 4 to complete the assembly installation. After the assembly is installed, it can be installed on the instrument panel mounting position via the mounting bracket 102 on the housing 1.

[0034] The solution provided by this utility model adopts a segmented external pull strap, thus the deployment angle of the knee airbag is controllable, improving practicality and applicability. Moreover, installation only requires drilling mounting holes on the shell, simplifying the structure and reducing production line upgrade costs. Furthermore, the segmented external pull strap eliminates the need for unnecessary steps such as pre-sewing and marking, optimizing production cycle and saving labor costs. This structure greatly increases the safety and stability of the airbag during deployment. While improving the practicality and applicability of the product, this structure also optimizes aspects such as the difficulty of sewing, assembly stability, deployment stability, and module cost of the airbag.

[0035] The above description is merely a preferred embodiment of the present utility model and does not limit the scope of the present utility model. All equivalent changes made based on the content of the present utility model specification and its drawings are included within the scope of the present utility model.

Claims

1. A knee airbag, characterized in that, The airbag body includes a first chamber and a second chamber, which are independent of each other and connected by sewing at their overlap. When inflated, the first chamber has a smaller volume than the second chamber. An outer covering is sewn to the outside of the first chamber. The outer covering is used to wrap the airbag body after it is folded and then hang it on the generator stud. The air outlet of the generator is connected to the first chamber. The side of the first chamber is provided with a segmented external pull strap. The outer end of the segmented external pull strap is folded and sewn to form a hook structure. The hook structure is used to fix it to the shell. When inflated, the first chamber pops out first before the second chamber and supports the second chamber. The segmented external pull strap constrains the first chamber during inflation, thereby changing the unfolding angle between the first and second chambers. After inflation, both the first and second chambers are close to the dashboard on one side and close to the passenger's knee on the other side, thus protecting the passenger's knee.

2. The knee airbag according to claim 1, characterized in that, Multiple openings are provided at the overlapping area between the first chamber and the second chamber, and air guide gaskets are provided at the openings.

3. The knee airbag according to claim 1, characterized in that, The first chamber is made of a single piece of fabric symmetrically sewn together, and has an offset reinforcing plate inside. The first chamber and the reinforcing plate are provided with insertion holes for the generator to pass through, and the first chamber is also provided with exit holes for the generator stud to pass through.

4. The knee airbag according to claim 1, characterized in that, The second chamber is made of a single piece of fabric symmetrically sewn together, and has multiple perforated pull straps inside, with different positions and sizes between the perforated pull straps.

5. The knee airbag according to claim 1, characterized in that, The first chamber is equipped with segmented external pull straps on both the left and right sides, and the segmented external pull straps on both sides are of the same length.

6. The knee airbag according to claim 1, characterized in that, The outer sheath has openings that fit the generator studs, which are used to wrap the air bag body after it is folded, and then hang it on the generator studs.

7. The knee airbag according to claim 4, characterized in that, The openings on each perforated belt include a central circular opening and two waist-shaped openings on both sides.

8. A knee airbag module assembly, characterized in that, The invention includes the knee airbag, generator, and air guiding device as described in any one of claims 1 to 7. The air guiding device is sleeved on one end of the generator's air outlet. After the generator is fitted with the air guiding device, it is inserted into the first chamber of the airbag body, and the generator stud protrudes outward from the first chamber. The airbag body is folded and wrapped with an outer cover, and then hung on the generator stud through the outer cover.

9. The knee airbag module assembly as described in claim 8, characterized in that, The air guiding device has a U-shaped slot structure, and the outer end of the air guiding device has a shielding part to block part of the generator's air outlet.

10. The knee airbag module assembly as described in claim 8, characterized in that, It also includes a housing and a cover; the housing has an opening on one side, and the housing is provided with a fixing hole adapted to the generator stud and an installation hole adapted to the segmented external pull strap hook structure. The air bag body together with the generator is set in the housing through the fixing hole and the installation hole, and the cover is placed on the opening of the housing, and the cover is provided with a tear line.

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