A two-chamber driver airbag

Abstract

This invention provides a dual-chamber driver's airbag, comprising a central inner chamber, an outer peripheral chamber, and a gas generator. The outer peripheral chamber has a ring-shaped structure and is fitted onto the outer wall of the central inner chamber. The common surface of the central inner chamber and the outer peripheral chamber is cylindrical. The central inner chamber and the outer peripheral chamber are coaxial and connected. The central inner chamber and the outer peripheral chamber communicate with each other. One or more vent holes are provided on the outer peripheral chamber. The gas generator is disposed inside the central inner chamber. This dual-chamber driver's airbag solves the technical problem that traditional airbags, with their thicker center and thinner edges, often result in the occupant's head contacting the thicker center of the airbag and the chest contacting the edge during a collision, ultimately leading to the ineffective protection of the chest by traditional airbags.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile airbags, and in particular relates to a two-chamber driver safety airbag. Background Art

[0002] Airbags are an indispensable safety device in the automobile restraint system. After a collision and before a secondary collision, the airbag installed between the occupant and the internal structure of the car will be deployed quickly, so that the occupant will fall on the airbag, slowing down the secondary collision and thus protecting the occupant. In order to improve the safety performance of vehicles, my country has the C-NCAP new car safety assessment procedure to conduct collision tests on vehicles, including a 100% rigid barrier collision at the front and the MPDB collision condition to be implemented. In various collisions, the design of the driver's airbag has an important impact on the safety performance of the vehicle.

[0003] At present, most driver airbags are circular single-chamber airbags made of two pieces of circular fabrics. The protection effect of the airbag is mainly affected by the three main parameters of the airbag's package shape, drawstring, and exhaust hole in terms of structure. The package shape of the airbag has a great influence on the protection range, protection angle, and injury value of the occupant, while the drawstring can control the deployment thickness of the airbag and fine-tune the deployment direction of the airbag. The internal air pressure of the traditional circular single-chamber airbag is uniform. Even under the control of the drawstring, the airbag often presents a phenomenon of thick in the middle and thin at the edge. In a collision, the occupant's head usually contacts the thicker part of the center of the airbag and the chest contacts the edge of the airbag. When optimizing the airbag deflation parameters, it is often impossible to take into account the best protection effect of the airbag on the head and chest, and ultimately lose one while gaining the other. Therefore, multi-chamber airbags have attracted more and more attention from modern automobile and airbag researchers. The existing two-chamber airbags are mostly isolated from the inner and outer cavities and use two independent gas generating devices, and the cost of domestic gas generating devices is very high. Summary of the invention

[0004] In view of this, the present invention aims to propose a dual-chamber driver airbag, which solves the technical problem that due to the phenomenon that the traditional airbag is thick in the middle and thin at the edges, the occupant's head usually contacts the thicker part in the center of the airbag and the chest contacts the edge of the airbag during a collision, ultimately resulting in the traditional airbag being unable to effectively protect the human chest.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] A two-chamber driver safety airbag, comprising a central inner chamber, an edge outer chamber and a gas generator;

[0007] The edge outer cavity is an annular structure, and the edge outer cavity is sleeved on the outer wall of the central inner cavity. The common surface of the central inner cavity and the edge outer cavity is cylindrical. The central inner cavity and the edge outer cavity are coaxial, the central inner cavity is connected to the edge outer cavity, and the central inner cavity is communicated with the edge outer cavity. One or more outer cavity air leakage holes are provided on the edge outer cavity, and the gas generator is arranged inside the central inner cavity.

[0008] Furthermore, the longitudinal cross-sectional structure of the central inner cavity is symmetrically provided with a first arc structure, the first arc structure is an outwardly convex arc, and the angle between the tangent of the first arc structure and the horizontal line is β, β gradually decreases from the end of the first arc structure to the top of the first arc structure, and the β angle is 30°-40°.

[0009] Furthermore, the longitudinal section structure of the edge outer cavity is symmetrically provided with a second arc structure, the second arc structure is an outwardly convex arc, the angle between the tangent of the second arc structure and the vertical line is α, α gradually decreases from the end of the second arc structure to the top of the second arc structure, and the angle α is 50°-60°.

[0010] Furthermore, the common surface of the central inner cavity and the edge outer cavity is a single layer, and a plurality of inner cavity air leakage holes are arranged on the common surface of the central inner cavity and the edge outer cavity.

[0011] Furthermore, when the central inner cavity is not inflated and flattened, the diameter of the central inner cavity is 380-430 mm.

[0012] Furthermore, when the edge outer cavity is not inflated and flattened, the diameter of the edge outer cavity is 600-680 mm.

[0013] Furthermore, when the central inner cavity and the edge outer cavity are not inflated and flattened, the axial height of the common surface of the central inner cavity and the edge outer cavity is 60-90 mm.

[0014] Furthermore, after the central inner cavity and the edge outer cavity are filled with air, the maximum diameter of the circumferential center line of the common surface of the central inner cavity and the edge outer cavity is 350-400 mm.

[0015] Furthermore, after the central inner cavity is filled with air, the axial thickness of the central inner cavity is in the range of 180-300 mm.

[0016] Furthermore, after the edge outer cavity is filled with air, the diameter of the edge outer cavity ranges from 600 to 660 mm;

[0017] Preferably, after the edge outer cavity is filled with air, the axial thickness of the edge outer cavity is 80-130 mm;

[0018] Preferably, after the central inner cavity is filled with gas, the pressure range of the central inner cavity is 160-190 KPa;

[0019] Preferably, after the edge outer cavity is filled with gas, the pressure range of the edge outer cavity is 120-145 KPa;

[0020] Preferably, after the central inner cavity and the edge outer cavity are filled with gas, the pressure difference between the central inner cavity and the edge outer cavity is required to be in the range of 15-70 KPa;

[0021] Preferably, after the central inner cavity and the edge outer cavity are filled with air, the minimum thickness of the edge outer cavity in contact with the chest is 20-40 mm;

[0022] Preferably, after the central inner cavity and the edge outer cavity are filled with air, the radius of curvature of the area where the edge outer cavity contacts the chest is required to be 340-380 mm;

[0023] Preferably, after the central inner cavity and the peripheral outer cavity are filled with air, the radius of curvature of the contact area between the central inner cavity and the head is required to be 70-120 mm;

[0024] Preferably, the central inner cavity and the edge outer cavity are nylon woven airbags;

[0025] Preferably, the central inner cavity and the edge outer cavity are sewn together by sewing thread;

[0026] Preferably, the wall thickness of the central inner cavity and the edge outer cavity is 0.28-0.3 mm;

[0027] Preferably, the common surface of the central inner cavity and the edge outer cavity is a coated nylon fabric;

[0028] Preferably, the thickness of the common surface wall of the central inner cavity and the edge outer cavity is 0.3-0.35 mm;

[0029] Preferably, the number of the inner cavity air leakage holes is 3-6, and the inner cavity air leakage holes are evenly distributed along the common surface of the central inner cavity and the edge outer cavity toward the center line;

[0030] Preferably, the diameter of the inner cavity air leakage hole is 15-30 mm;

[0031] Preferably, the number of the outer cavity air leakage holes is 3-6, and the outer cavity air leakage holes are evenly arranged in the circumferential direction around the axis of the edge outer cavity;

[0032] Preferably, the gas generator is connected to the central inner cavity through a plurality of mounting holes;

[0033] Preferably, the central inner cavity is provided with two or four drawstrings. When there are two drawstrings, the two drawstrings are symmetrically arranged in the central inner cavity or the two drawstrings are symmetrically arranged in the central inner cavity. When there are four drawstrings, two drawstrings are symmetrically arranged in the central inner cavity, and the other two drawstrings are symmetrically arranged in the central inner cavity.

[0034] Preferably, the airbag weighs 280-320g;

[0035] Preferably, the airbag further includes a sensor and an electronic control unit, and the gas generator and the sensor are both connected to the electronic control unit.

[0036] Compared with the prior art, the dual-chamber driver airbag described in the present invention has the following advantages:

[0037] The dual-chamber driver airbag of the present invention has the following advantages: (1) in a frontal 100% rigid barrier collision, the driver's head touches the center of the inner cavity of the driver's airbag. Under the condition of the same air intake volume, compared with a single-chamber airbag with the same detonation time, the driver's head contacts the airbag earlier, that is, is protected by the airbag earlier, and the peak value of the head acceleration is smaller and the pulse width is larger, indicating that the dual-chamber airbag has less impact on the driver's head; the driver's chest touches the outer cavity of the airbag. Since the edge outer cavity pressure and the center inner cavity pressure can be independently adjusted through the inner cavity vent hole, the edge outer cavity pressure is optimized while ensuring that the center inner cavity has the best protection effect on the head, thereby achieving the best protection of the driver's chest by the outer cavity.

[0038] (2) In the MPDB collision condition to be implemented, the two-chamber driver airbag is flatter than a single-chamber airbag of the same size and air intake, so the contact area between the driver and the airbag is larger. After the driver's body twists in a collision, his head can fully contact the outer cavity of the airbag. Compared with the traditional single-chamber airbag, the occupant's head is prone to slip after colliding with the edge of the airbag. The new two-chamber airbag can protect the driver's head more fully and effectively.

[0039] (3) Compared with the existing two-chamber driver airbag in which the central inner cavity and the edge outer cavity are completely independent and each of which is equipped with a gas generating device, the new two-chamber airbag only needs to have one gas generator in the inner cavity, so the airbag is more economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0041] Figure 1This is a schematic diagram of the structure of a two-chamber driver's airbag according to an embodiment of the present invention;

[0042] Figure 2 This is a schematic diagram of the front structure of a two-chamber driver's airbag according to an embodiment of the present invention;

[0043] Figure 3 This is a schematic diagram of the back structure of a two-chamber driver's airbag according to an embodiment of the present invention;

[0044] Figure 4 This is a schematic diagram of the structure of a two-chamber driver's airbag according to an embodiment of the present invention;

[0045] Figure 5 A schematic diagram of the cross-sectional structure of a two-chamber driver's airbag according to an embodiment of the present invention;

[0046] Figure 6 This is a schematic diagram of the structure of the central inner cavity in a two-cavity driver's airbag according to an embodiment of the present invention;

[0047] Figure 7 This is a schematic diagram of the structure of the edge outer cavity in a two-cavity driver's airbag according to an embodiment of the present invention;

[0048] Figure 8 The present invention is a schematic structural diagram of a common surface of a central inner cavity and an edge outer cavity in a two-cavity driver's safety airbag according to an embodiment of the present invention.

[0049] Description of reference numerals:

[0050] 1-Center inner cavity; 2-Edge outer cavity; 3-Mounting hole; 4-Gas generator; 5-Common surface; 6-Sewing thread; 7-Inner cavity air leakage hole; 8-Outer cavity air leakage hole; 9-Airbag fixing area; 10-Drawstring; 11-Gas flow direction; 12-Annular center line. DETAILED DESCRIPTION

[0051] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0052] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0053] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0054] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0055] A two-chamber driver airbag, such as Figure 1 As shown, it includes a central inner cavity 1, an outer edge cavity 2 and a gas generator 4;

[0056] The edge outer cavity 2 is an annular structure, and the edge outer cavity 2 is sleeved on the outer wall of the central inner cavity 1. The common surface 4 of the central inner cavity 1 and the edge outer cavity 2 is cylindrical. The central inner cavity 1 and the edge outer cavity 2 are coaxial. The central inner cavity 1 is connected to the edge outer cavity 2. The central inner cavity 1 is communicated with the edge outer cavity 2. One or more outer cavity air leakage holes 8 are provided on the edge outer cavity 2, and the gas generator 4 is arranged inside the central inner cavity 1.

[0057] During the inflation process of the central inner cavity 1, under the action of the pressure difference between the central inner cavity 1 and the edge outer cavity 2, the central inner cavity 1 enters the edge outer cavity 2 through the inner cavity air leakage hole 7, thereby realizing the inflation process of the edge outer cavity 2. In addition, the pressure retention of the head and chest contact area can be achieved, ensuring that the pressure in the head area is greater than the pressure in the chest contact area, thereby achieving the effect of minimizing the chest injury of the occupant in a collision.

[0058] The longitudinal section structure of the central inner cavity 1 is symmetrically provided with a first arc structure, which is an outwardly convex arc. The angle between the tangent of the first arc structure and the horizontal line is β, which gradually decreases from the end of the first arc structure to the top of the first arc structure, and the angle β is 30°-40°.

[0059] The longitudinal section structure of the edge outer cavity 2 is symmetrically provided with a second arc structure, which is an outwardly convex arc. The angle between the tangent of the second arc structure and the vertical line is α, which gradually decreases from the end of the second arc structure to the top of the second arc structure, and the angle α is 50°-60°.

[0060] The common surface 4 of the central inner cavity 1 and the peripheral outer cavity 2 is a single layer, and a plurality of inner cavity air leakage holes 7 are arranged on the common surface 4 of the central inner cavity 1 and the peripheral outer cavity 2 .

[0061] In this embodiment, when the central inner cavity 1 and the edge outer cavity 2 are not inflated and flattened, the diameter of the central inner cavity 1 is 400 mm, the diameter of the edge outer cavity 2 is 680 mm, and the axial height of the common surface 4 of the central inner cavity 1 and the edge outer cavity 2 is 80 mm.

[0062] After the central inner cavity 1 and the edge outer cavity 2 are filled with air, the maximum diameter of the common surface 4 of the central inner cavity 1 and the edge outer cavity 2 in the circumferential centerline 12 is 370mm, the axial thickness range of the central inner cavity 1 is 220mm, the diameter range of the edge outer cavity 2 is 620mm, the diameter of the edge outer cavity 2 must be greater than the steering wheel diameter, the axial thickness of the edge outer cavity 2 is 100mm, the pressure range of the central inner cavity 1 is 175KPa, the pressure range of the edge outer cavity 2 is 130KPa, and the pressure difference requirement range between the central inner cavity 1 and the edge outer cavity 2 is 45KPa;

[0063] After the central inner cavity 1 and the edge outer cavity 2 are filled with air, the minimum thickness of the edge outer cavity 2 in contact with the chest is 25 mm;

[0064] After the central inner cavity 1 and the peripheral outer cavity 2 are filled with air, the curvature radius of the area where the peripheral outer cavity 2 contacts the chest is required to be 360 ​​mm, and the curvature radius of the area where the central inner cavity 1 contacts the head is required to be 90 mm;

[0065] The central inner cavity 1 and the peripheral outer cavity 2 are nylon fabric airbags, and the central inner cavity 1 and the peripheral outer cavity 2 are sewn together by sewing thread 6;

[0066] The wall thickness of the central inner cavity 1 and the edge outer cavity 2 is 0.28-0.3 mm, the common surface 4 of the central inner cavity 1 and the edge outer cavity 2 is a coated nylon fabric, and the wall thickness of the common surface 4 of the central inner cavity 1 and the edge outer cavity 2 is 0.3-0.35 mm;

[0067] There are 4 inner cavity air leakage holes 7, which are evenly distributed along the common surface 4 of the central inner cavity 1 and the edge outer cavity 2 toward the center line 12. The diameter of the inner cavity air leakage holes 7 is 15-30 mm. The air pressure of the edge outer cavity 2 can be optimized by the air leakage speed of the central inner cavity 1 and the aperture of the outer cavity air leakage holes 8. After a collision, the driver's head generally contacts the central inner cavity 1 of the airbag, while the driver's chest mainly contacts the edge outer cavity 2 of the airbag. While satisfying the pressure retention of the central inner cavity 1, the edge outer cavity 2 achieves the optimal protection effect on the driver's chest, achieves the pressure retention of the head contact area, and can achieve the effect of minimizing the injury to the occupants in the collision;

[0068] There are two outer cavity air leakage holes 8, which are evenly arranged in the circumferential direction of the edge outer cavity 2. The outer cavity air leakage holes of the edge outer cavity 2 are arranged on the back of the edge outer cavity 2. The air leakage through the edge outer cavity 2 can reduce vibration, release energy, and absorb the driver's kinetic energy faster.

[0069] The gas generator 4 is connected to the central inner cavity 1 through a plurality of mounting holes 3. In this embodiment, there are four mounting holes 3, and the airbag can be fixed through the four mounting holes 3.

[0070] The central inner cavity 1 is provided with two or four draw straps 10. When there are two draw straps 10, the two draw straps 10 are symmetrically arranged in the central inner cavity 1 or the two draw straps 10 are symmetrically arranged in the central inner cavity 1 from top to bottom. When there are four draw straps 10, two draw straps 10 are symmetrically arranged in the central inner cavity 1 from top to bottom, and the other two draw straps 10 are symmetrically arranged in the central inner cavity 1 from top to bottom. The unfolded thickness of the central inner cavity 1 can be continuously optimized by adjusting the length of the draw straps 10 and the area of ​​the connection between the central inner cavity 1 and the edge outer cavity 2.

[0071] In this embodiment, the weight of the airbag is 280-320g. The airbag also includes a sensor and an electronic control unit. The gas generator 4 and the sensor are both connected to the electronic control unit.

[0072] How this example works

[0073] First, the mounting holes 3 in the airbag fixing area are fixedly installed, such as Figure 1 As shown, after a collision occurs, the sensor senses the collision intensity of the car and transmits the sensed signal to the electronic control unit. The electronic control unit receives the signal from the sensor and processes it. When it determines that it is necessary to open the airbag, it immediately sends an ignition signal to trigger the gas generator 4. After receiving the ignition signal, the gas generator 4 in the central cavity 1 is quickly ignited. The gas generated by the gas generator 4 first fills the central cavity 1. As the gas pressure in the central cavity 1 increases, the gas enters the edge cavity 2 through the cavity vent hole 7. Figure 1 The gas flow direction is shown in 11;

[0074] After a collision, the driver's head generally contacts the central inner cavity 1 of the airbag, while the driver's chest mainly contacts the edge outer cavity 2 of the airbag. By optimizing the pressure ratio of the central inner cavity 1 and the edge outer cavity 2, the best protection effect of the airbag on the head and chest is achieved.

[0075] The airbag of the present invention can be made of any flexible material, including nylon cloth coated with chloroprene rubber or silicone, etc., having appropriate heat capacity, toughness, modulus, roughness, etc.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A two-chamber driver airbag, characterized in that: It includes a central inner cavity, an outer edge cavity and a gas generator; The edge outer cavity is an annular structure, the edge outer cavity is sleeved on the outer wall of the central inner cavity, the common surface of the central inner cavity and the edge outer cavity is cylindrical, the central inner cavity and the edge outer cavity are coaxial, the central inner cavity is connected with the edge outer cavity, one or more outer cavity air leakage holes are provided on the edge outer cavity, and the gas generator is arranged inside the central inner cavity; The longitudinal section structure of the central inner cavity is symmetrically provided with a first arc structure, the first arc structure is an outwardly convex arc, and the angle between the tangent of the first arc structure and the horizontal line is β, β gradually decreases from the end of the first arc structure to the top of the first arc structure, and the angle β is 30°-40°; The longitudinal section structure of the outer edge cavity is symmetrically provided with a second arc structure, the second arc structure is an outwardly convex arc, the angle between the tangent of the second arc structure and the vertical line is α, α gradually decreases from the end of the second arc structure to the top of the second arc structure, and the angle α is 50°-60°; The common surface of the central inner cavity and the edge outer cavity is a single layer, and a plurality of inner cavity air leakage holes are arranged on the common surface of the central inner cavity and the edge outer cavity; The gas first fills the central cavity, then enters the peripheral cavity through the vent holes, forming a pressure difference; When the central inner cavity is not inflated and flattened, the diameter of the central inner cavity is 380-430 mm; When the edge outer cavity is not inflated and flattened, the diameter of the edge outer cavity is 600-680 mm; When the central inner cavity and the edge outer cavity are not inflated and flattened, the axial height of the common surface of the central inner cavity and the edge outer cavity is 60-90 mm; After the edge outer cavity is filled with air, the diameter of the edge outer cavity ranges from 600 to 660 mm; After the edge outer cavity is filled with air, the axial thickness of the edge outer cavity is 80-130 mm; After the central cavity is filled with gas, the pressure range of the central cavity is 160-190 KPa; After the edge outer cavity is filled with gas, the pressure range of the edge outer cavity is 120-145KPa; After the central inner cavity and the edge outer cavity are filled with gas, the pressure difference between the central inner cavity and the edge outer cavity is required to be in the range of 15-70KPa; After the central inner cavity and the edge outer cavity are filled with air, the minimum thickness of the edge outer cavity in contact with the chest is 20-40 mm; After the central inner cavity and the edge outer cavity are filled with air, the radius of curvature of the edge outer cavity in contact with the chest is required to be 340-380 mm; After the central inner cavity and the peripheral outer cavity are filled with air, the radius of curvature of the contact area between the central inner cavity and the head is required to be 70-120 mm; The central inner cavity and the edge outer cavity are nylon woven airbags; The central inner cavity and the edge outer cavity are sewn together by sewing thread; The wall thickness of the central inner cavity and the edge outer cavity is 0.28-0.3mm; The common surface of the central inner cavity and the edge outer cavity is a coated nylon fabric; The thickness of the common surface wall of the central inner cavity and the edge outer cavity is 0.3-0.35mm; The number of the inner cavity air leakage holes is 3-6, and the inner cavity air leakage holes are evenly distributed along the common surface of the central inner cavity and the edge outer cavity toward the center line; The diameter of the inner cavity air leakage hole is 15-30mm; The number of the outer cavity leak holes is 3-6, and the outer cavity leak holes are evenly arranged in the circumferential direction around the axis of the edge outer cavity; the gas generator is connected to the central inner cavity through a plurality of mounting holes; The central inner cavity is provided with two or four drawstrings. When there are two drawstrings, the two drawstrings are symmetrically arranged in the central inner cavity or the two drawstrings are symmetrically arranged in the central inner cavity. When there are four drawstrings, two drawstrings are symmetrically arranged in the central inner cavity, and the other two drawstrings are symmetrically arranged in the central inner cavity. The airbag weighs 280-320g; The safety airbag further comprises a sensor and an electronic control unit, and the gas generator and the sensor are both connected to the electronic control unit.

2. A dual-chamber driver airbag according to claim 1, characterized in that: After the central inner cavity and the edge outer cavity are filled with air, the maximum diameter of the circumferential center line of the common surface of the central inner cavity and the edge outer cavity is 350-400 mm.

3. A dual-chamber driver airbag according to claim 2, characterized in that: After the central inner cavity is filled with air, the axial thickness of the central inner cavity ranges from 180 to 300 mm.

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