Airbag device and vehicle

Abstract

The invention discloses a safety air bag device and a vehicle. The safety air bag device comprises an air bag body, a bearing assembly and a drawstring assembly. The drawstring assembly comprises a traction piece and a drawstring. The traction piece is connected with the near side end of the air bag body; the drawstring is connected with the traction piece and comprises a first section and a second section. The first section is connected with the bearing assembly; the second section is connected with the air bag body. In the first operation mode, the air bag body is restrained by the drawstring assembly to be opened to form a first volume, and the first section and the second section are located on the two sides of the traction piece and form a first acute angle. In the second operation mode, the first section is disconnected from the bearing assembly, and the air bag body is expanded to be in a second volume larger than the first volume. In a first operating mode of the airbag device, a first tension on the first section is less than a preset bearing force of the first section. In this way, the drawstring assembly is not prone to being damaged or loosen from the fixing mechanism, the air bag body is prevented from being excessively opened, and injuries to passengers are avoided.

Description

Technical Field

[0001] The present application relates to the field of automobile technology, and in particular to an airbag device. The present application also relates to a vehicle comprising the airbag device. Background Art

[0002] Automobiles are usually equipped with airbag devices. When the automobile collides, the airbags of the airbag devices will be inflated and opened immediately to protect the occupants in the seats.

[0003] In some cars, the seat back has a wide adjustment angle range so that passengers can sit on the seat in various sitting positions. In this case, the airbag of the airbag device can be configured to adjust the volume after inflation according to the tilt angle of the seat back (i.e., the angle of the seat back relative to the vertical direction) to protect passengers in different sitting positions.

[0004] A drawstring can usually be constructed on the airbag, with the first end of the drawstring fixed to the end of the airbag facing the occupant, and the second end fixed to the fixing mechanism away from the occupant, and the drawstring is constructed so that its preset bearing capacity is greater than or equal to the actual bearing capacity of the drawstring. When the inclination angle of the seat back is small, the drawstring keeps restraining the airbag, so that when the airbag is inflated and opened, the airbag is restrained by the drawstring and opens to a smaller first volume. When the inclination angle of the seat back is large, the drawstring no longer restrains the airbag, so that when the airbag is inflated, it opens to a larger second volume. However, due to manufacturing errors of the airbag device, when the inclination angle of the seat back is small, the volume of the airbag after inflating and opening may be greater than the first volume, which will cause excessive tension on the drawstring, and then cause the drawstring to be easily damaged or loosened from the fixing mechanism. The airbag is thus not restrained by the drawstring and opens excessively, and may even cause harm to the occupant. Summary of the invention

[0005] In view of the above technical problems, the first aspect of the present application proposes an airbag device. The airbag device comprises: an airbag body; a load-bearing assembly, which is suitable for bearing the airbag body; and a drawstring assembly, which comprises a flexible pull member and a flexible drawstring; the first end of the pull member is connected to the end portion of the airbag body facing the occupant; the middle part of the drawstring is connected to the second end of the pull member and comprises a first section and a second section; the first section is connected to the load-bearing assembly; the second section is connected to the end portion of the airbag body away from the occupant; in a first operating mode, the pull member and the drawstring are connected as a whole, and the airbag body is constrained by the drawstring assembly and opens to a first volume; the first section and the second section are located on both sides of the pull member and form a first acute angle; and in a second operating mode, the first section is disconnected from the load-bearing assembly, and the airbag body is freed from the constraint of the drawstring assembly and opens to a second volume larger than the first volume.

[0006] In one embodiment, in the first operating mode, the first section is subjected to a first tensile force, the second section is subjected to a second tensile force, and the pulling member is subjected to the tensile force; a second acute angle is formed between the line of action of the first tensile force and the reverse extension line of the line of action of the tensile force, and a third acute angle is formed between the line of action of the second tensile force and the reverse extension line of the line of action of the tensile force; the second acute angle is greater than the third acute angle.

[0007] In one embodiment, the drawstring includes a first drawstring and a transition drawstring; the first drawstring is connected to the second end of the pull member and includes a first half and a second half located on both sides of the pull member; the two ends of the transition drawstring are respectively connected to the first half and the load-bearing assembly, so that the transition drawstring and the first half form a first section; the second half forms a second section and is connected to the end portion of the airbag body away from the occupant.

[0008] In one embodiment, the second end of the pulling member is configured with a first connecting ring; the first drawing belt passes through the first connecting ring to be connected to the pulling member.

[0009] In one embodiment, a second connecting ring is constructed on the first half; the transition strap includes a second strap and a third strap; the second strap passes through the second connecting ring to be connected to the first half and includes a third half and a fourth half; the third half is connected to the load-bearing assembly; the two ends of the third strap are respectively connected to the fourth half and the end portion of the airbag body away from the occupant; in a first operating mode, the pulling member, the first strap, the second strap and the third strap are connected as a whole; the airbag body is constrained by the strap assembly and expanded into a first volume; the third half and the fourth half are on both sides of the first half and form a fourth acute angle; and in a second operating mode, the third half is disconnected from the load-bearing assembly, and the airbag body is freed from the constraint of the strap assembly and expanded into a second volume larger than the first volume.

[0010] In one embodiment, the pulling member is configured in a strip shape; a connecting hole is configured at the second end of the strip-shaped pulling member.

[0011] In one embodiment, the airbag body includes a first airbag and a second airbag located on the end portion of the first airbag facing the occupant, the second airbag being connected to the first airbag; a pulling member is arranged on the inner surface of the second airbag, and a drawstring is also arranged on the inner surface of the first airbag.

[0012] In one embodiment, an opening is configured on the end portion of the first air bag facing the occupant; the second air bag is communicated with the first air bag through the opening; in the first operation mode, the second air bag is constrained by the drawstring assembly and sinks into the opening.

[0013] In one embodiment, a reinforcement sheet is provided at an end portion of the second air bag facing the occupant to form a reinforcement area; and the first end of the pulling member is connected to the reinforcement area.

[0014] In one embodiment, the support assembly includes a shell and two gas generators; two mounting openings are provided on the shell wall of the shell, the two gas generators are mounted on the shell wall and the air outlets of the two gas generators are respectively aligned with the corresponding mounting openings; the airbag body is accommodated in the shell and two air inlets are constructed at the end portion of the airbag body away from the occupant, and the two air inlets are connected to the air outlets of the corresponding gas generators.

[0015] In one embodiment, the bearing assembly further includes a fixing mechanism disposed on the housing wall, and the first section is fixed by the fixing mechanism.

[0016] According to a second aspect of the present application, a vehicle is provided, which includes the airbag device described above.

[0017] The beneficial effects of the present application are as follows: In the airbag device of the present application, in different operation modes, a drawstring assembly is used to control the volume of the airbag body when it is inflated and opened, so as to protect passengers in different sitting positions. In addition, according to the airbag device of the present application, in the first operation mode, after the airbag body is inflated and opened, the first section and the second section of the drawstring are located on both sides of the pulling member and form a first acute angle. In this way, the first tension on the first section is less than the preset bearing capacity of the first section. The drawstring assembly is not easily damaged or loosened from the fixing mechanism, but keeps restraining the airbag body to prevent the airbag body from being over-opened, thereby helping to prevent the airbag body from causing harm to the passengers. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0019] Figure 1 A vehicle according to one embodiment of the present application is schematically shown.

[0020] Figure 2 An exploded view of an airbag arrangement is shown schematically.

[0021] Figure 3 The airbag body is shown schematically.

[0022] Figure 4 The exploded view of the airbag body is schematically shown, with the drawstring assembly omitted.

[0023] Figure 5 The diagram schematically shows a state where only the first airbag is inflated.

[0024] Figure 6 The diagram schematically shows a state where both the first air bag and the second air bag are inflated.

[0025] Figure 7 The figure schematically shows the cutouts of the first air bag.

[0026] Figure 8 The cutout diagram of the second air bag is schematically shown.

[0027] Fig. 9 The drawstring assembly of the first embodiment is schematically shown, wherein the airbag body is in a first operating mode.

[0028] Fig.10 The figure schematically shows a force analysis diagram of the second end of the pulling member when the airbag body is in the first operation mode.

[0029] Fig.11 The drawstring assembly of the first embodiment is schematically shown, wherein the airbag body is in the second operating mode.

[0030] Fig.12 The drawstring assembly of the second embodiment is schematically shown, wherein the airbag body is in a first operating mode.

[0031] Fig.13 The drawstring assembly of the second embodiment is schematically shown, wherein the airbag body is in the second operating mode.

[0032] Fig.14 The drawstring assembly of the third embodiment is schematically shown, wherein the airbag body is in a first operating mode.

[0033] Fig.15 The drawstring assembly of the third embodiment is schematically shown, wherein the airbag body is in the second operating mode.

[0034] Reference numerals list

[0035] 1 Vehicle

[0036] 10 seats 11 instrument panel assembly

[0037] 12 Seat back

[0038] 2 Airbag device

[0039] 3 air bag body

[0040] 31 First Airbag

[0041] 311 proximal end of the first air bag 312 distal end of the first air bag

[0042] 313 Air Inlet

[0043] 315 opening 316 pit

[0044] 317 first main piece 318 first side piece

[0045] 32 Second Airbag

[0046] 321 proximal end of the second air bag 322 reinforcement sheet

[0047] 323 Distal end of the second air bag

[0048] 327 second main piece 328 second side piece

[0049] 4 Load-bearing components

[0050] 410 housing 411 bottom wall

[0051] 420 gas generator 421 gas outlet

[0052] 430 fixed mechanism

[0053] 5. Pull-strap assembly

[0054] 50 pull strap

[0055] 501 first section 502 second section

[0056] 503 Central

[0057] 51 First drawstring

[0058] 511 first half 512 second half

[0059] 513 Second connecting ring

[0060] 52 Second drawstring

[0061] 523 The third half 524 The fourth half

[0062] 53 Third drawstring

[0063] 54 transition pull belt

[0064] 541 first end of transition drawstring 542 second end of transition drawstring

[0065] 55 Pulling piece

[0066] 551 first end of the pulling member 552 second end of the pulling member

[0067] 553 first connecting ring 554 connecting hole

[0068] A first acute angle B second acute angle

[0069] C The third acute angle D The fourth acute angle

[0070] F1 first pull F2 second pull

[0071] F Pulling force

[0072] F' the reverse extension of the line of action of the pulling force

[0073] F1' the reverse extension line of the line of action of the first tension

[0074] L1 Length direction of the first main piece DETAILED DESCRIPTION

[0075] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0076] In the present application, the end portion of the airbag body (or the first airbag, the second airbag) facing the occupant is also referred to as the "proximal end"; the end portion of the airbag body (or the first airbag, the second airbag) away from the occupant is also referred to as the "distal end".

[0077] Figure 1 A vehicle 1 according to an embodiment of the present application is schematically shown. Figure 1 As shown, the vehicle 1 includes a seat 10 and a dashboard assembly 11 in front of the seat 10. An airbag device 2 is arranged in the dashboard assembly 11. When the vehicle 1 collides, the airbag body 3 of the airbag device 2 will inflate and pop out from the dashboard assembly 11 to protect the occupants. It should be understood that the airbag device 2 can also be installed in other locations in the vehicle 1, such as the center of the steering wheel.

[0078] Next, the airbag device 2 will be described.

[0079] like Figure 2 As shown, the airbag device 2 includes an airbag body 3, a bearing assembly 4 and a drawstring assembly 5 (as shown in FIG. Fig. 9 shown).

[0080] like Figure 3 and Figure 4As shown, the airbag body 3 includes a first airbag 31 and a second airbag 32 connected to the first airbag 31. The second airbag 32 is located at the end portion 311 of the first airbag 31 facing the occupant (hereinafter referred to as the proximal end 311 of the first airbag 31). The second airbag 32 is suitable for being constrained by the drawstring assembly 5 and inflated and opened under specific circumstances (this will be described below). In one embodiment, the airbag body 3 can also be constructed to have only one airbag, and the size of the airbag after being inflated and opened is constrained by the drawstring assembly 5. For simplicity, the technical solution of the present application is described by taking the solution in which the airbag body 3 includes the first airbag 31 and the second airbag 32 as an example.

[0081] Also like Figure 2 As shown, the bearing assembly 4 includes a shell 410 and two gas generators 420. The air bag body 3 is folded and arranged in the shell 410. Two installation openings (not shown in the figure) are configured on the bottom wall 411 of the shell 410. The two gas generators 420 are installed on the bottom wall 411 and the gas outlets 421 of the two gas generators 420 are respectively aligned with the corresponding installation openings. For example, the gas outlets 421 of the gas generators 420 are inserted through the corresponding installation openings and enter the shell 410 (such as Figure 2 Two air inlets 313 (as shown) are configured at an end portion 312 of the first air bag 31 away from the occupant (hereinafter referred to as the distal end 312 of the first air bag 31). Figure 7 As shown), the two air inlets 313 are connected to the air outlets 421 of the corresponding gas generators 420, so as to inflate the airbag body 3 using the gas generator 420.

[0082] Also like Figure 2 As shown, the bearing assembly 4 also includes a fixing mechanism 430 disposed on the bottom wall 411 of the housing 410. The drawstring assembly 5 is adapted to be connected to the fixing mechanism 430. In one embodiment, the fixing mechanism 430 may be an electronic actuator. The electronic brake may select whether to release the drawstring assembly 5 based on the operating mode of the airbag device 2, which will be described below. The electronic brake is well known to those skilled in the art and will not be described in detail here. It should be understood that the control mechanism 430 may also be disposed at other positions of the housing 410 according to actual conditions.

[0083] Fig. 9The drawstring assembly 5 of the first embodiment is schematically shown. In the drawstring assembly 5 of the first embodiment, the drawstring assembly 5 includes a flexible pull member 55 and a flexible drawstring 50. The first end 551 of the pull member 55 is connected to the end portion 321 of the second air bag 32 facing the occupant (hereinafter referred to as the proximal end 321 of the second air bag 32). The drawstring 50 has a middle portion 503 and a first section 501 and a second section 502 located on both sides of the middle portion 503. It should be understood that the middle portion 503 of the drawstring 50 refers to a position deviating from the two ends of the drawstring 50, and is not necessarily the midpoint of the length of the drawstring 50. The middle portion 503 of the drawstring 50 is connected to the second end 552 of the pull member 55; after the first air bag 31 is inflated and opened, the first section 501 and the second section 502 are located on both sides of the drawstring 55. As also shown in FIG. Fig. 9 As shown, in the drawstring assembly 5 of the first embodiment, the drawstring 50 includes a first drawstring 51 and a flexible transition drawstring 54. The first drawstring 51 is connected to the pulling member 55 and includes a first half 511 and a second half 512. The first end 541 of the transition drawstring 54 is connected to the first half 511, and the second end 542 of the transition drawstring 54 is connected to the fixing mechanism 430 of the load-bearing assembly 4. In this way, the transition drawstring 54 and the first half 511 form a first section 501, and the second half 512 forms a second section 502 and is connected to the distal end 312 of the first air bag 31. It should be noted that the lengths of the first half 511 and the second half 512 can be equal or unequal (e.g., Fig. 9 This can be determined according to actual conditions.

[0084] It should be noted that in order to connect the transition strap 54 to the fixing mechanism 430, for example, a through hole (not shown in the figure) is constructed on the distal end 312 of the first air bag 31, and the transition strap 54 extends from the inside of the first air bag 31 through the through hole to connect with the fixing mechanism 430 (or the electronic brake). It should be understood that a sealing member (not shown in the figure) is also provided at the through hole to prevent the first air bag 31 from leaking.

[0085] Also like Fig. 9 As shown, in the first operation mode of the airbag device 2, the pulling member 55, the first drawstring 51 and the transition drawstring 54 are connected as a whole, and the electronic brake does not release the drawstring assembly 5 so that the drawstring assembly 5 restrains the second airbag 32 and only allows the first airbag 31 to inflate and expand to the first volume (such as Figure 5 and Fig. 9 As shown). Fig. 9 and Fig.10As shown, after the first air bag 31 is inflated and opened, the pulling member 55, the first drawstring 51 and the transition drawstring 54 are tensioned. The first half 511 (and the transition drawstring 54) and the second half 512 are located on both sides of the pulling member 55 and form a first acute angle A. The first half 511 (or the transition drawstring 54) bears the first pulling force F1, the second half 512 bears the second pulling force F2, and the pulling member 55 bears the pulling force F.

[0086] like Fig.11 As shown, in the second operation mode of the airbag device 2, the electronic brake automatically releases the drawstring assembly 5, and the electronic brake of the transition drawstring 54 is disconnected (even, the first drawstring 51 and the transition drawstring 54 are also separated from the pulling member 55), so that the drawstring assembly 5 no longer restrains the second airbag 32. In this way, the first airbag 31 and the second airbag 32 are both inflated and expanded to form a second volume larger than the first volume (such as Figure 6 and Fig.11 shown).

[0087] When the distance between the occupant and the instrument panel assembly 11 is small (for example, the tilt angle of the seat back 12 is small, so that the distance between the occupant and the instrument panel assembly 11 is small), the airbag device 2 is in the first operation mode. In this way, if necessary, the airbag body 3 can be inflated to expand into a smaller first volume (that is, only the first airbag 31 is inflated and expanded) and the occupant is protected. When the distance between the occupant and the instrument panel assembly 11 is large (for example, the tilt angle of the seat back 12 is large, so that the distance between the occupant and the instrument panel assembly 11 is large; or the occupant on the seat 10 is relatively thin or a child, so that the distance between the occupant and the instrument panel assembly 11 is large), the airbag device 2 is in the second operation mode. In this way, if necessary, the airbag body 3 can be inflated to expand into a larger second volume (that is, the first airbag 31 and the second airbag 32 are both inflated and expanded) and the occupant is protected. Therefore, the airbag device 2 according to the present application can protect passengers at different distances from the instrument panel assembly 11, and can protect passengers sitting at different angles. In one embodiment, the vehicle 1 can identify the distance from the passenger to the instrument panel assembly 11 through a sensor, and automatically set the airbag device 2 to the first operating mode or the second operating mode based on this, which is well known to those skilled in the art and will not be described in detail here.

[0088] It should be noted that the sizes of the first volume and the second volume can be determined according to actual conditions, which will not be described in detail here.

[0089] Since the bearing assembly 4 includes two gas generators 420, in the first operation mode, only one gas generator 420 generates gas to inflate the airbag body 3 and open only the first airbag 31; in the second operation mode, the two gas generators 420 generate gas at the same time to inflate the airbag body 3 and open both the first airbag 31 and the second airbag 32. Thus, the amount of gas inflated to the airbag body 3 in different operation modes can be conveniently and accurately controlled, which is particularly beneficial for avoiding the failure of the drawstring assembly 5 due to excessive inflation into the first airbag 31 in the first operation mode. It should be understood that the amount of gas generated by each gas generator 420 can be determined according to actual requirements and is not limited here.

[0090] In addition, in the prior art, for a specific fixing mechanism 430, a rope (such as a drawstring or a pull strap in the prior art) used in conjunction with the fixing mechanism 430 is used. Fig. 9 The transition strap 54 shown in (a) should meet the specific requirements of the fixing mechanism 430, which makes the rope have a specific preset load-bearing capacity. In this way, according to the airbag device 2 of the present application, the preset load-bearing capacity of the transition strap 54 is equal to the preset load-bearing capacity of the strap in the prior art. In addition, in the first operating mode, when the first airbag 31 is opened to the first volume as in the prior art, the pulling force F on the pulling member 55 is equal to the pulling force actually borne by the strap in the prior art and is less than the preset load-bearing capacity of the strap in the prior art. In other words, according to the airbag device 2 of the present application, in the first operating mode, the pulling force F on the pulling member 55 is less than or equal to the preset load-bearing capacity of the transition strap 54. Also as Fig.10 As shown, in the first operation mode, when the first air bag 31 is opened to the first volume, the force analysis is performed on the second end 552 of the pulling member 55. Due to the first acute angle A formed by the first half 511 (or the transition strap 54) and the second half 512, the first tension F1 on the first half 511 (or the transition strap 54) must be smaller than the tension F on the pulling member 55, and further smaller than the preset bearing capacity of the transition strap 54. In this way, even if the volume of the first air bag 31 after inflation is larger than the preset first volume within a certain range, the transition strap 54 (or the strap assembly 5) is still not easily damaged or loosened from the fixing mechanism 430, but keeps restraining the second air bag 32, preventing the air bag body 3 from being over-opened, and thus helping to avoid injuries to the occupants.

[0091] Optionally, Fig. 9 and Fig.10As shown, in the first operation mode, the first half 511 (or the line of action of the first pulling force F1) and the reverse extension line F' of the line of action of the pulling force F form a second acute angle B; the second half 512 (or the line of action of the second pulling force F2) and the reverse extension line F' of the line of action of the pulling force F form a third acute angle C; and the second acute angle B is greater than the third acute angle C. In this way, Fig.10 From the force analysis of the second end 552 of the pulling member 55, it can be seen that the first tension F1 on the first half 511 (or the transition strap 54) is less than the second tension F2 on the second half 512. This helps to further reduce the first tension F1 on the transition strap 54, so that in the first operating mode, the transition strap 54 is less likely to be damaged or loosened from the fixing mechanism 430.

[0092] Optionally, the pulling member 55 is disposed on the inner surface of the second airbag 32, and the first drawstring 51 and the transition drawstring 54 are also connected to the inner surface of the first airbag 31. Overall, the drawstring assembly 5 is basically located inside the airbag body 3. In this way, when the airbag body 3 is inflated, it helps to prevent the airbag body 3 from being entangled by the drawstring assembly 5 and being unable to be smoothly opened. In addition, the drawstring assembly 5 being located inside the airbag body 3 also helps to prevent the drawstring assembly 5 from being hooked by other components of other bearing assemblies 4 and being damaged, thereby causing a malfunction of the airbag device 2.

[0093] Optionally, Fig. 9 As shown, the second end 552 of the pulling member 55 is configured with a first connecting ring 553. The first drawstring 51 passes through the first connecting ring 553 to be connected to the pulling member 55. According to this structure, there is no need to perform additional sewing and fixing operations on the first drawstring 51 and the pulling member 55, thereby simplifying the manufacture of the airbag device 2. Moreover, in the second operation mode, this structure also facilitates the separation of the first drawstring 51 (and the transition drawstring 54) from the pulling member 55 to avoid hindering the opening of the second airbag 32.

[0094] In one embodiment, the first half 511 and the second half 512 may also be split and respectively connected to the second end 552 of the pulling member 55. In this way, the first half 511 and the second half 512 may be constructed differently as required, which will not be described in detail here.

[0095] In one embodiment, the drawstring assembly 5 may also include only the first drawstring 51 without the transition drawstring 54. In this case, the first half 511 of the first drawstring 51 should meet the requirements of the fixing mechanism 430 and be directly connected to the bearing assembly 4; the second half 512 is connected to the above (and Fig. 9 This is easy to implement for those skilled in the art and will not be described in detail here.

[0096] Fig.12 and Fig.13 FIG. 5 shows a drawstring assembly 5 of a second embodiment. The drawstring assembly 5 of the second embodiment is similar to the drawstring assembly 5 of the first embodiment described above, and only the main differences between the two are described here. Fig.12 and Fig.13 As shown, in the drawstring assembly 5 of the second embodiment, the pull member 55 is configured as a strip with a suitable width, and a connecting hole 554 is configured at the second end of the strip-shaped pull member 55. In this way, the first drawstring 51 passes through the connecting hole 554 and is connected to the strip-shaped pull member 55. According to this structure, the connection area between the strip-shaped pull member 55 and the second air bag 32 is large, which helps to stably fix the pull member 55 to the second air bag 32. The width of the pull member 55 can be determined according to actual needs and is not limited here.

[0097] Fig.14 and Fig.15 FIG. 5 shows a drawstring assembly 5 of a third embodiment. The drawstring assembly 5 of the third embodiment is similar to the drawstring assembly 5 of the first embodiment described above, and only the main differences between the two are described here. Fig.14 As shown, a second connecting ring 513 is configured on the first half 511 of the first drawstring 51. The transition drawstring 54 includes a second drawstring 52 and a third drawstring 53. The second drawstring 52 passes through the second connecting ring 513 to be connected to the first half 511, and the second drawstring 52 also includes a third half 523 and a fourth half 524. The third half 523 is connected to the fixing mechanism 430 of the bearing assembly 4. Both ends of the third drawstring 53 are respectively connected to the fourth half 524 and the distal end 312 of the first air bag 31.

[0098] Also like Fig.14 As shown, in the first operation mode of the airbag device 2, the pulling member 55, the first drawstring 51, the second drawstring 52 and the third drawstring 53 are connected as a whole. The electronic brake does not release the drawstring assembly 5 to restrain the second airbag 32 and only allows the first airbag 31 to inflate and expand to the first volume. After the first airbag 31 is inflated and expanded, the pulling member 55, the first drawstring 51, the second drawstring 52 and the third drawstring 53 are tensioned, and the first half 511 and the second half 512 are located on both sides of the pulling member 55 and form a first acute angle A; the first half 511 is subjected to a first tensile force F1, the second half 512 is subjected to a second tensile force F2, and the pulling member 55 is subjected to a tensile force F, which is consistent with Fig. 9 and Fig.10 The same as the drawstring assembly 5 of the first embodiment shown. Fig.14As shown, the third half 523 and the fourth half 524 are located on both sides of the first half 511 and form a fourth acute angle D. According to this structure, through the force analysis of the second connecting ring 513 (the force analysis process of the second connecting ring 513 is similar to the force analysis of the second end 552 of the pulling member 55 described above, which will not be repeated here), the pulling force on the third half 523 is less than the preset bearing capacity of the third half 523. In this way, in the first operation mode, after the first air bag 31 is inflated and opened, the second drawstring 52 (or drawstring assembly 5) is less likely to be damaged or loosened from the fixing mechanism 430, but keeps restraining the second air bag 32, avoiding excessive opening of the air bag body 3, and also helping to avoid injuries to the occupants.

[0099] like Fig.15 As shown, in the second operation mode of the airbag device 2, the electronic brake automatically releases the drawstring assembly 5, the third half 523 is disconnected from the fixing mechanism 430, and the drawstring assembly 5 no longer restrains the second airbag 32. In this way, the first airbag 31 and the second airbag 32 are both inflated and expanded to form a second volume greater than the first volume (such as Figure 6 and Fig.15 shown).

[0100] The specific structure of the airbag body 3 is shown below.

[0101] like Figure 4 As shown in FIG. 1 , an opening 315 is configured on the proximal end 311 of the first air bag 31, and the second air bag 32 is connected to the first air bag 31 through the opening 315. In the first operation mode, only the first air bag 31 is inflated and expanded, while the second air bag 32 is constrained by the drawstring assembly 5 and falls into the opening 315 (as shown in FIG. 1 ). Figure 5 As shown in FIG. 1 , a recess 316 is formed at the opening 315. The recess 316 is adapted to a part of the front side of the occupant's body (such as the head), which helps to further improve the protective effect of the airbag device 2 on the occupant.

[0102] Optionally, Figure 4 and Figure 8 As shown, a reinforcing sheet 322 is provided at the proximal end 321 of the second air bag 32 to form a reinforcing area. The first end 551 of the pulling member 55 is connected to the reinforcing area. According to this structure, the strength of the reinforcing area is high to prevent the second air bag 32 from being damaged by the pulling member 55 in the first operation mode. In one embodiment, the material of the reinforcing sheet 322 can be the same as that of the second air bag 32 (or the air bag body 3), for example, it can be nylon fabric.

[0103] In one embodiment, the reinforcing sheet 322 is connected to the inner surface of the second air bag 32, and the first end 551 of the pulling member 55 is connected to the reinforcing sheet 322. In other embodiments, the first end 551 of the pulling member 55 may be disposed between the reinforcing sheet 322 and the second air bag 32, and connected to both the reinforcing sheet 322 and the second air bag 32.

[0104] The manufacturing process of the airbag body 3 is described below.

[0105] like Figure 7 As shown, when manufacturing the first air bag 31, first, a first main sheet 317 and two first side sheets 318 are provided. The first main sheet 317 is generally strip-shaped (for example, generally rectangular) and is configured with two air inlets 313, through holes (not shown in the figure), and openings 315 deviating from the air inlets 313 along the length direction L1 of the first main sheet 317. Then, the two first side sheets 318 are sewn to the two length edges of the first main sheet 317 respectively; and the two width edges of the first main sheet 317 are butt-stitched together; thereby forming a Figure 4 The first air bag 31 shown in FIG. In one embodiment, a drawstring 50 may also be provided on the first main sheet 317 and / or the first side sheet 318 in advance.

[0106] like Figure 8 As shown, when manufacturing the second air bag 32, first, a second main sheet 327, two second side sheets 328, a pulling member 55 and a reinforcing sheet 322 are provided. The first main sheet 317 is generally strip-shaped (for example, generally rectangular). Next, as shown in FIG. Figure 8 As shown in FIG. 1 , the reinforcing sheet 322 is set on the second main sheet 327 to form the reinforcing area described above; then, the first end 551 of the pulling member 55 is connected to the reinforcing sheet 322. Then, the two second side sheets 328 are sewn to the two length edges of the second main sheet 327 respectively; the two width edges of the second main sheet 327 are kept separate. Thus, the reinforcing area is formed as shown in FIG. Figure 4 The second air bag 32 shown in FIG. 1 is a second air bag 32 , and an end portion 323 of the second air bag 32 away from the occupant (hereinafter referred to as the distal end 323 of the second air bag 32 ) forms an open opening corresponding to the opening 315 on the first air bag 31 .

[0107] The drawstring 50 is connected to the pulling member 55, and the distal end 323 of the second air bag 32 is sewn to the proximal end 311 of the first air bag 31, and the distal end 323 of the second air bag 32 (i.e., the open mouth of the second air bag 32) is communicated with the opening 315 on the first air bag 31. In this way, the air bag body 3 is manufactured.

[0108] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. An airbag device, characterized in that: include: air bag body; A bearing assembly, the bearing assembly being adapted to bear the airbag body; as well as A drawstring assembly, comprising a flexible pulling member and a flexible drawstring; the first end of the pullstring is connected to the end portion of the airbag body facing the occupant; the middle portion of the drawstring is connected to the second end of the pullstring and comprises a first section and a second section; the first section is connected to the bearing assembly, and the second section is connected to the end portion of the airbag body away from the occupant; In the first operation mode, the pulling member and the drawstring are connected as a whole, and the airbag body is constrained by the drawstring assembly and expanded into a first volume; the first section and the second section are located on both sides of the pulling member and form a first acute angle; as well as In the second operation mode, the first section is disconnected from the load-bearing assembly, and the airbag body is freed from the constraint of the drawstring assembly and expands to a second volume greater than the first volume.

2. The airbag device according to claim 1, characterized in that: In the first operating mode, the first section is subjected to a first tensile force, the second section is subjected to a second tensile force, and the pulling member is subjected to a tensile force; a second acute angle is formed between the line of action of the first tensile force and the reverse extension line of the line of action of the tensile force, and a third acute angle is formed between the line of action of the second tensile force and the reverse extension line of the line of action of the tensile force; the second acute angle is greater than the third acute angle.

3. The airbag device according to claim 1, characterized in that: The drawstring includes a first drawstring and a transition drawstring; the first drawstring is connected to the second end of the pull member and includes a first half and a second half located on both sides of the pull member; the two ends of the transition drawstring are respectively connected to the first half and the bearing assembly, so that the transition drawstring and the first half form the first section; the second half forms the second section and is connected to the end portion of the airbag body away from the occupant.

4. The airbag device according to claim 3, characterized in that: A first connecting ring is formed at the second end of the pulling member; the first pulling belt passes through the first connecting ring to be connected with the pulling member.

5. The airbag device according to claim 3, characterized in that: The first half is provided with a second connecting ring; the transition drawstring includes a second drawstring and a third drawstring; the second drawstring passes through the second connecting ring to be connected to the first half and includes a third half and a fourth half; the third half is connected to the bearing assembly; two ends of the third drawstring are respectively connected to the fourth half and an end portion of the airbag body away from the occupant; In the first operation mode, the pulling member, the first drawstring, the second drawstring and the third drawstring are connected as a whole; the airbag body is constrained by the drawstring assembly and expands into a first volume; the third half and the fourth half are located on both sides of the first half and form a fourth acute angle; and In the second operation mode, the third half is disconnected from the load-bearing assembly, and the airbag body is freed from the constraint of the drawstring assembly and expanded to a second volume greater than the first volume.

6. The airbag device according to claim 1, characterized in that: The pulling member is configured in a strip shape; a connecting hole is configured at the second end of the strip-shaped pulling member.

7. The airbag device according to claim 1, characterized in that: The airbag body includes a first airbag and a second airbag located on an end portion of the first airbag facing the occupant, the second airbag being in communication with the first airbag; The pulling member is arranged on the inner surface of the second air bag, and the drawstring is arranged on the inner surface of the first air bag.

8. The airbag device according to claim 7, characterized in that: An opening is configured on the end portion of the first air bag facing the occupant; the second air bag is communicated with the first air bag through the opening; in the first operation mode, the second air bag is constrained by the drawstring assembly and sinks into the opening.

9. The airbag device according to claim 7, characterized in that: A reinforcement sheet is arranged at the end portion of the second air bag facing the occupant to form a reinforcement area; and the first end of the pulling member is connected to the reinforcement area.

10. The airbag device according to claim 1, characterized in that: The bearing assembly comprises a shell and two gas generators; two mounting openings are arranged on the shell wall of the shell, the two gas generators are mounted on the shell wall and the gas outlets of the two gas generators are respectively aligned with the corresponding mounting openings; The airbag body is accommodated in the housing and two air inlets are configured at an end portion of the airbag body away from the occupant, the two air inlets being connected to corresponding air outlets of the gas generator.

11. The airbag device according to claim 10, characterized in that: The bearing assembly further comprises a fixing mechanism disposed on the housing wall, and the first section is fixed by the fixing mechanism.

12. A vehicle, characterized in that: The invention comprises an airbag device according to any one of claims 1 to 11.

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