KR102096933B1 - Airbag apparatus of vehicle - Google Patents

Abstract

The present invention relates to a vehicle airbag device including: an airbag cushion which is formed in a shawl shape and is deployed toward both sides and the front of a passenger so as to wrap and restrain the entire upper body around both shoulders of the passenger when a vehicle collides; an inflator that generates gas by an impact detection signal when the vehicle collides and supplies the gas to the airbag cushion; and a limiting means for limiting the deployment shape of the airbag cushion. Accordingly, the limiting means is applied to limit the deployment shape of the airbag cushion, so that the deployment performance of the airbag cushion can be improved, and stiffness supporting the side of the passenger is increased to protect the passenger safely.

Description

AIRBAG APPARATUS OF VEHICLE

The present invention relates to an airbag device for a vehicle, and more particularly, to an airbag device for a vehicle that restrains and protects the upper body around the occupant's shoulder when the vehicle crashes.

In general, a vehicle airbag device is a safety device that protects passengers by inflating an airbag by injecting gas into the airbag according to a signal from a shock sensor when a vehicle crashes.

The airbag device is installed on a steering wheel or a dashboard, a seat, a side wall, or the like provided in the vehicle, and is expanded toward the front or side of the occupant to protect the occupant when the vehicle crashes.

That is, the vehicle may be provided with a front airbag deployed in the front of the driver's seat and a passenger seat, a curtain airbag and side airbag deployed in a side of the passenger to protect the passenger, and a knee airbag for protecting the knee of the passenger.

Meanwhile, in recent years, autonomous vehicles have been developed to move themselves without the driver driving the vehicle.

The autonomous vehicle uses a state-of-the-art sensor capable of recognizing surrounding objects and a high-performance graphic processing device to detect each device provided in the vehicle and the situation around the vehicle, and controls driving of each device provided in the vehicle according to the detection result. Drive.

The state-of-the-art sensor measures the distance between an object and a person like a person and detects a danger, thereby helping to see all areas without blind spots. In addition, the graphic processing device helps the vehicle to safely drive by grasping the surrounding environment of the vehicle through several cameras and analyzing the image.

For example, a self-driving vehicle may be equipped with LiDAR equipment, sound wave equipment, 3D cameras, radar equipment, and the like.

In the autonomous vehicle configured as described above, as the driver does not need to drive, the entire seat including the driver's seat rotates freely, and the angle of the backrest is adjusted to a horizontal state by a tilting operation.

The rider can adjust the angle of the backrest in various ways, and rotate the seat to face the rider in the back seat and have a meeting.

Therefore, it is impossible to apply a general airbag device designed on the basis of the posture in which the occupant is seated toward the front of the autonomous vehicle.

The following Patent Document 1 and Patent Document 2 disclose a vehicle passenger protection system configuration.

Republic of Korea Patent Registration No. 10-1655569 (announced on September 8, 2016) Republic of Korea Patent Registration No. 10-1611087 (announced on April 11, 2016)

However, Patent Literature 1 and Patent Literature 2 are components that selectively control the deployment of each airbag applied to a general vehicle, and are unable to adequately mitigate the impact applied to the occupant according to the posture or direction of the occupant during the collision of the vehicle. There was a limit to preventing injury.

Accordingly, there is a need to develop a technology capable of safely protecting the occupant regardless of the posture and direction in which the occupant in the autonomous vehicle is seated.

In particular, in recent years, an integrated seat belt (BIS) that is integrated into a seat of an automobile is applied.

Accordingly, there is a need to develop a technology capable of safely protecting the occupant by being expanded and deployed on the front, near and far sides of the occupant in conjunction with the integral seat belt or the general seat belt.

An object of the present invention is to solve the problems as described above, to provide an airbag device for a vehicle that can safely protect the occupant by inflating and deploying the airbag on the front and both sides of the occupant when the vehicle crashes.

Another object of the present invention is to provide an airbag device for a vehicle that can safely protect the occupant regardless of the direction and posture of the occupant in the autonomous vehicle.

Another object of the present invention is to provide an airbag device for a vehicle that can safely protect a passenger by raising side rigidity when deploying an airbag cushion.

In order to achieve the above object, the airbag device of the vehicle according to the present invention is formed in a shawl shape so as to wrap and restrain the entire upper body around the shoulders of both sides of the occupant during the collision of the vehicle, and is deployed toward both sides and the front of the occupant It is characterized in that it comprises an airbag cushion, an inflator for generating gas by an impact detection signal when a vehicle crashes, and supplying it to the airbag cushion, and limiting means for limiting the deployment shape of the airbag cushion.

As described above, according to the airbag device of the vehicle according to the present invention, by applying a limiting means to limit the deployment shape of the airbag cushion, the deployment performance of the airbag cushion is improved, and the stiffness supporting the side of the occupant is increased to increase occupants The effect that can be safely protected is obtained.

That is, according to the present invention, by using the pair of tethers to limit the deployment shape of the first and second cushions, it is possible to improve the side stiffness of the first and second cushions and improve the deployment performance of the airbag cushion. The effect is obtained.

In addition, according to the present invention, the effect that the entire deployment shape of the airbag cushion can be more efficiently limited as well as the front ends of the first and second cushions by using the limiting member is obtained.

1 is a perspective view of an airbag device for a vehicle according to a preferred embodiment of the present invention,
FIG. 2 is a plan view of the airbag device of the vehicle shown in FIG. 1;
3 is an exploded view of an airbag cushion,
4 is a front view of an airbag device of a vehicle according to another embodiment of the present invention,
5 is a view illustrating the results of the deployment experiment of the airbag cushion,
6 and 7 are front and side views of the airbag cushion and the limiting means applied to the airbag device of the vehicle according to the first embodiment of the present invention,
8 and 9 are front and side views of an airbag cushion and a limiting means applied to an airbag device of a vehicle according to a second embodiment of the present invention,
10 and 11 are front and side views of an airbag cushion and a limiting means applied to an airbag device of a vehicle according to a third embodiment of the present invention,
12 and 13 are front and side views of an airbag cushion and a limiting means applied to an airbag device of a vehicle according to a fourth embodiment of the present invention,
14 and 15 are front and side views of an airbag cushion and a limiting means applied to an airbag device of a vehicle according to a fifth embodiment of the present invention.

Hereinafter, an airbag device of a vehicle according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The present invention expands and deploys airbag cushions on both sides and front of the head and chest of the occupant around both shoulders of the occupant to restrain the occupant's upper body to protect the occupant safely.

Of course, the present invention can also extend the length of the airbag cushion downward to protect the pelvis and thigh of the occupant.

In addition, the present invention improves the deployment performance of the airbag by installing a tether on the airbag cushion and deploying the airbag cushion to a predetermined shape.

Hereinafter, the configuration of the airbag device applied to the seat (BIS) in which the integrated seat belt is installed and the configuration of the airbag device applied to the seat in which the general seat belt is installed will be separately described.

Then, the configuration of the driver's airbag device installed in the driver's seat of the vehicle will be described.

Here, the direction toward the front of the car centered on the driver's seat is called 'front', and the direction toward the rear of the car is called 'rear'. In addition, terms indicating directions such as 'left', 'right', 'upper' and 'downward' are defined to indicate respective directions based on the front and rear.

Therefore, reference numeral F shown in the figure represents the front of the vehicle, reference numeral B represents the rear of the vehicle, reference numeral U represents the upper side of the vehicle, and reference numeral D represents the lower side of the vehicle. In addition, reference numeral I denotes the inside direction of the vehicle in the width direction of the vehicle, and reference numeral O denotes the outside direction of the vehicle in the width direction of the vehicle.

Therefore, the front and rear (F, B) directions of the vehicle may be expressed in the horizontal direction, and the top and bottom (U, D) directions of the vehicle may be expressed in the vertical direction.

First, with reference to Figures 1 to 3 will be described in detail the configuration of the airbag device of a vehicle according to a preferred embodiment of the present invention.

1 is a perspective view of an airbag device of a vehicle according to a preferred embodiment of the present invention, FIG. 2 is a plan view of the airbag device of the vehicle shown in FIG. 1, and FIG. 3 is an exploded view of an airbag cushion.

The airbag device 10 of a vehicle according to a preferred embodiment of the present invention, as shown in FIGS. 1 to 3, shawl shape to wrap and restrain the entire upper body around both shoulders of the occupant when the vehicle crashes It is formed of an airbag cushion 20 which is formed toward both sides of the occupant and an inflator 21 that generates gas by an impact detection signal when a vehicle crashes and supplies it to the airbag cushion.

Along with this, the airbag device 10 of a vehicle according to a preferred embodiment of the present invention further includes limiting means to limit the deployment shape of the airbag cushion 20.

The airbag cushion 20 is inflated and deployed on both sides and front of the occupant to restrain the occupant's head, chest, abdomen, and pelvis centered on the occupant's shoulder, thereby protecting the occupant safely.

To this end, the airbag cushion 20 is formed in a shawl shape surrounding both shoulders of the occupant, and expands forward and upward and downward of the occupant to correspond to the occupant's head, chest, abdomen and pelvis centered on the occupant's shoulder. Can be deployed.

In detail, the airbag cushion 20 is installed on the backrest 12 of the seat 11 in which the occupant is seated, and the first and second expansions and downwards are deployed forward and upward and downward from both upper ends of the backrest 12. It may include a cushion (30,40).

The first cushion 30 may expand and expand toward the right side and front part of the head and chest and abdomen portions of the occupant while surrounding the right shoulder of the occupant when viewed in FIGS. 1 and 2.

The second cushion 40 may expand and expand toward the left side and front part of the head and chest and abdomen portions of the occupant while wrapping while restraining the occupant's left shoulder.

That is, the first and second cushions 30 and 40 are expanded and expanded from the top of the backrest 12 toward the front, respectively, to constrain both shoulders of the occupant, and from the head of the occupant to both sides of the chest, abdomen, and pelvis. It can be expanded and deployed to the front to protect the entire upper body of the occupant.

To this end, the first and second cushions 30 and 40 may be inflated and expanded at both ends of the backrest 12 toward the front center of the occupant.

Therefore, according to the present invention, the airbag cushion can be expanded and expanded to simultaneously obtain a curtain airbag function, a far side and a near side airbag, and a front airbag function.

The upper ends of the first and second cushions 30 and 40 may be connected by a connecting portion 50 disposed on the rear side of the headrest 13 installed on the upper side of the backrest 12.

As described above, according to the present invention, by arranging the connection portion on the rear side of the headrest and configuring the airbag cushion as a shawl type, the strength of the airbag cushion can be improved using the support force of the headrest.

The first and second cushions 30 and 40 may have a bag shape that defines an expandable space therein by the lower wall, the front wall, and the rear wall, respectively.

And the first and second cushions 30 and 40 are sewn of the inner panels 31 and 41 facing the occupant and the outer panels 32 and 42 facing the occupant as shown in FIG. 2, respectively. Or it is formed in a bag shape by a one piece woven (one piece woven) method, it may have a plurality of protection areas to correspond to the body part in contact with the occupant.

For example, as illustrated in FIGS. 1 and 3, the first cushion 30 and the second cushion 40 are upper protection regions A1 and A3 that protect the occupant's head, shoulder, and upper chest, respectively. And lower protective areas A2 and A4 protecting the lower part of the chest and the abdomen and pelvis of the occupant.

In detail, the upper and lower protection regions A1 and A2 of the first cushion 30 are defined by the first chamber wall 35 formed along the vertical direction in the central portion of the first cushion 30. The first and second chambers 33 and 34 may be included.

Similarly, the upper and lower protective regions A3 and A4 of the second cushion 40 are defined by the second and second chamber walls 45 formed along the vertical direction in the central portion of the second cushion 40. It may include four chambers (43,44).

The first and second chamber walls 35 and 45 may each be formed in an approximately 'C' shape opened toward the rear.

Here, the first and second chamber walls (35, 45) in the lower portion so as to be positioned in front of the central portion of the first and second cushion 20, in order to effectively cushion the impact when the collision with the head and shoulders of the occupant It may be formed to be inclined toward the front toward the top.

In addition, the first and second chamber walls 35 and 45 may be formed to be bent in a concave shape toward the rear so as to constrain the shoulder and chest portions of the occupants.

Therefore, the head and shoulder portions of the occupant are expanded by the first and second chamber walls 35 and 45 by the first and second chamber walls 35 and 45 when the vehicle collides with the side. It can be safely protected by four chambers (34,44).

In addition, the head and shoulder portions of the occupant may be in between the first and second chambers 33 and 34 expanded around the first and second chamber walls 35 and 45 and the third and fourth chambers when the vehicle is inclined. (43,44).

As described above, the present invention can effectively restrain the head and shoulder portions of the occupant during side collision and inclined collision of the vehicle, thereby minimizing the brain injury value of the occupant.

On the other hand, the first to fourth chambers (33,34,43,44), so as to protect the occupant's abdomen and pelvis, as well as the occupant's buttocks and thighs, respectively, by varying the length extending downwards Can be set.

At least one third chamber wall 51 defining the connecting portion 50 as a plurality of chambers may be formed in the connecting portion 50.

For example, the third chamber wall 41 may be formed along the horizontal direction to limit the connecting portion 50 to two chambers that expand and expand side by side.

As shown in FIG. 2, the first cushion 30 and the connecting portion 50 and the second cushion 40 are viewed from the front by the first to third chamber walls 35, 45, and 51 when the vehicle crashes. When the expansion may be expanded to bend in a substantially '∩' shape.

Therefore, the connection part 50 can effectively reduce the brain injury value of the occupant by restraining the head portion of the occupant from moving outside the headrest during an inclined collision of the vehicle and absorbing the impact due to the collision.

Here, each wall and chamber wall of the first and second cushions 30 and 40 sew the inner and outer panels 31, 32, 41 and 42 of the first and second cushions 30 and 40, respectively, or It can be formed by a method of weaving in a piece woven manner.

Alternatively, each wall and chamber wall of the first and second cushions 30 and 40 may be formed by selectively applying one or more appropriate methods among various bonding methods such as adhesive, RF welding, and ultrasonic welding.

Further, in the present embodiment, first and second introduction parts 36 and 46 into which gas is introduced from the inflator 21 may be provided on the rear walls 303 and 403 of the first and second cushions 30 and 40, respectively.

The first and second introduction parts 36 and 46 are connected to each inflator 21.

For example, the first and second introduction parts 36 and 46 may firstly transfer the gas supplied from the inflator 21 to the second chamber 34 and the fourth chamber 44 when the vehicle crashes. The second and fourth chambers 34 and 44 may be formed to be inclined toward the front side from the rear side.

As shown in FIG. 3, the inflator 21 may have two identical specifications, for example, gas generation amount, supply speed, etc., or two different specifications according to the collision characteristics of the far side and the near side of the occupant. have.

Of course, the present invention is not necessarily limited to this, and may be changed to supply gas to the airbag cushion using one inflator or gas to the airbag cushion using three or more inflators.

The first and second cushions 30 and 40 configured as described above and the rear walls 303 and 403 of the connecting portion 50 are disposed inside the back 12 of the seat 11 using a plurality of fixing members (not shown). Can be fixed.

As described above, the configuration of the airbag cushion has been described in detail with reference to FIGS. 1 to 3, but the present invention is not limited thereto.

That is, according to the present invention, the number, shape, length and size of chambers and chamber walls provided in the airbag cushion can be variously changed to deploy the airbag cushion in various shapes and sizes according to conditions for protecting the occupants.

And Figure 4 is a front view of the airbag device of a vehicle according to another embodiment of the present invention.

As shown in FIG. 4, in a vehicle in which a general seat belt 15 is applied, both ends of the seat belt 16 are installed at the upper and lower ends of the center pillar (aka B-pillar) 16 in the driver seat 11. A buckle 17 to which the tongue of the seat belt 15 is coupled is installed at the lower right of the driver's seat 11.

For this reason, when the above airbag cushion 20 is applied to a vehicle to which a general seatbelt is applied, there is a problem that the seatbelt 15 and the second cushion 40 interfere with each other.

Therefore, the present invention may be configured to include only a part of the second cushion 40, that is, only the upper protection area A3 of the second cushion 40 shown in FIG. 3 when a general seat belt is applied.

And a near side airbag 18 may be installed at the left end of the backrest 12.

As described above, the present invention may partially apply the second cushion to avoid interference with the seat belt, and may protect the left side of the occupant in conjunction with an existing installed near side airbag.

As described above, in the present invention, the airbag cushion 20 is expanded and expanded into a shawl shape that wraps the entire upper body around both shoulders of the occupant when a vehicle crashes, thereby restraining both sides and the front of the occupant to protect them safely Do it.

5 is a view illustrating the results of the deployment experiment of the airbag cushion.

As a result of the deployment experiment of the airbag device 10 to which the limiting means 60 has not been applied, the airbag cushion 20 has the first and second cushions 30 and 40 spread on both sides, as shown in FIG. 5. There was a problem in that it could not be deployed with an optimal deployment shape that constrains both sides and the front.

Therefore, the present invention applies the limiting means 60 for limiting the deployment shape so that the airbag cushion 20 is deployed in an optimal deployment shape that constrains both sides and the front of the occupant.

The configuration of the limiting means 60 will be described in detail with reference to FIGS. 6 to 13.

6 and 7 are front and side views of an airbag cushion and limiting means applied to an airbag device of a vehicle according to a first embodiment of the present invention.

In this embodiment, the limiting means 60 may be provided as a first tether 61 having both ends connected to the seat 11 and the airbag cushion 20.

For example, the first tether 61 is a pair installed between both sides of the seat 11 and the front ends of the first and second cushions 30 and 40, as shown in FIGS. 6 and 7. Can be prepared.

The first tether 61 may be manufactured using the same or similar fabric material as the airbag cushion 20.

One end of the first tether 61 is fixed to the first and second cushions 30 and 40 by a sewing method, and one end of the first tether 61 is fixed to a frame (not shown) inside the seat 11. Can be.

When the vehicle crashes, the airbag cushion 20 expands and expands, and the first tether 61 protrudes to the outside of the seat 11 while cutting a tear line (not shown) formed on the cover side or upper surface of the seat 11. Can be.

Meanwhile, in FIGS. 6 and 7, the lower end of the first tether 61 is illustrated as being connected to both corners of the seat 11, but the lower end of the first tether 61 is a side or upper surface of the seat 11 or It can be fixed to the frame through various positions such as the lower surface.

However, it can be confirmed that the lower end of the first tether 61 effectively limits the deployment shape of the airbag cushion 20 as it is installed closer to the front end of the seat 11 as a result of the deployment performance test of the airbag cushion 20. there was.

Therefore, the lower end of the first tether 61 is preferably installed close to the front end of the sheet 11.

In addition, the upper end of the first tether 61 is preferably connected to the lower wall 301,401 or the front wall 302,402 of the airbag cushion 20 so as to be prevented from being separated by the expansion force.

As described above, as the first tether 61 is installed between the seat 11 and the airbag cushion 20, the first and second cushions 30 and 40 of the airbag cushion 20 are seated when the vehicle crashes. 11) and the first tether 61 is expanded and expanded while maintaining a distance corresponding to the length.

Accordingly, the airbag cushion 20 can be deployed in an optimal deployment shape that constrains both side and front surfaces of the occupant.

In addition, according to the present invention, as the deployment shape of the airbag cushion is limited by using the first tether, the deployment performance of the airbag cushion is improved, and the stiffness supporting the side of the occupant is increased to protect the occupant safely.

Next, FIGS. 8 and 9 are front and side views of the airbag cushion and the limiting means applied to the airbag device of the vehicle according to the second embodiment of the present invention.

In the second embodiment of the present invention, the limiting means (60) is a non-expansion area (37) deactivated so as not to expand by the first and second chamber walls (35, 45) in the first and second cushions (30, 40). , 47) and a pair of second tethers 62 installed between the seats 11.

For example, the upper end of each second tether 62 is fixed to the inner or outer surfaces of the non-expansion areas 37 and 47 by a sewing method, and the lower end of the second tether 62 is attached to the frame inside the seat 11. Can be fixed.

That is, as the upper ends of the second tethers 62 are connected to the non-expansion regions 37 and 47 by the first and second chamber walls 35 and 45, the present invention expands and expands the airbag cushion 20. In the process, the first and second cushions 30 and 40 and the second tether 62 may be separated, or damage or breakage of the first and second cushions 30 and 40 may be prevented.

As described above, according to the present invention, as the deployment shape of the airbag cushion is limited by using the second tether, the deployment performance of the airbag cushion is improved, and the stiffness supporting the side of the occupant is increased to protect the occupant safely.

10 and 11 are front and side views of an airbag cushion and limiting means applied to an airbag device of a vehicle according to a third embodiment of the present invention.

In the third embodiment of the present invention, the limiting means 60 is installed outside the first and second cushions 30 and 40, as shown in FIGS. 10 and 11, and again the first and second cushions 30 , 40 may include a pair of third tethers 63 that are fixed to the sheet 11.

That is, the upper end of the third tether 63 is connected to the front ends of the first and second cushions 30 and 40, that is, the front walls 302 and 402, and the outer surfaces of the first and second third cushions 30 and 40 As it is disposed in, the deployment shape of the airbag cushion 20 is limited so that the first and second cushions 30 and 40 do not spread outward.

And the lower end of the third tether 63 penetrates the first and second cushions 30 and 40 and is connected to the seat 11 inside the first and second cushions 30 and 40.

To this end, the first and second cushions 30 and 40 may be formed with through holes 38 and 48 through which the third tether 63 is installed from the outside to the inside.

The through holes 38 and 48 are regions that require relatively high lateral stiffness on the first and second chamber walls 35 and 45, that is, they require relatively low lateral stiffness by avoiding the shoulder and pelvis portions of the occupants. It may be formed in an area, that is, an intermediate position corresponding to the side between the occupant's shoulder and the pelvis.

As described above, the present invention provides the side rigidity of the first and second cushions by installing a pair of third tethers on the outer surfaces of the first and second cushions and again fixing the seats through the first and second cushions. By improving the and limiting the deployment shape of the airbag cushion, it is possible to improve the deployment performance of the airbag cushion.

In particular, the present invention can more efficiently limit the deployment shape of the first and second cushions by installing a pair of third tethers at a position higher than the front center of the first and second cushions.

12 and 13 are front and side views of an airbag cushion and a limiting means applied to an airbag device of a vehicle according to a fourth embodiment of the present invention.

In the fourth embodiment of the present invention, the limiting means 60 is disposed along the outer surface of the airbag cushion 20 as shown in FIGS. 12 and 13, and the first and second cushions 30 and 40 are on both sides. It may include a limiting member 64 to limit the deployment shape so as not to open.

That is, both ends of the limiting member 64 are fixed to the seat 11 and are disposed along the outer surfaces of the first and second cushions 30 and 40 and the connection portion 50 to limit the deployment shape of the airbag cushion 20 do.

The limiting member 64 is made of a fabric manufactured to have rigidity in the weaving process, such as crepe, and is disposed in the connection portion 50 rather than a portion disposed on the outer surfaces of the first and second cushions 30 and 40 The portion to be made can be manufactured to have a wider width.

Here, the central portion of the limiting member 64 is fixed to the outer surface of the connecting portion 50 by a sewing method to prevent the flow of the limiting member 64 and to fix the position of the limiting member 64 when the airbag cushion 20 is deployed. Can be.

Therefore, the present invention is to limit the deployment shape so that the airbag cushion does not spread to both sides by disposing the limiting member on the outer surface of the airbag cushion, and fixing both ends of the limiting member to the seat, and the side rigidity of the first and second cushions. By improving, the deployment performance of the airbag cushion can be improved.

14 and 15 are front and side views of an airbag cushion and a limiting means applied to an airbag device of a vehicle according to a fifth embodiment of the present invention.

In the fifth embodiment of the present invention, the limiting means 60 are alternately arranged on the outer and inner surfaces of the airbag cushion 20, as shown in FIGS. 14 and 15, and the first and second cushions 30 and 40 ) May include a fourth tether 65 that limits the deployment shape so that it does not spread to both sides.

That is, both ends of the fourth tether 65 are fixed to the seat 11, the central portion of the fourth tether 65 is disposed on the outer surface of the connecting portion 50, and both side portions of the fourth tether 65 are respectively first And alternately arranged along the inner and outer surfaces of the second cushions 30 and 40 to define the deployment shape of the airbag cushion 20.

To this end, a pair of through holes 38 and 48 may be formed in a pair of non-expansion regions 37 and 47 formed in the first and second cushions 30 and 40, respectively.

Therefore, both sides of the fourth tether 65 are inserted into the first and second cushions 30 and 40 through the through holes 38 and 48 located at the top among the pair of through holes 38 and 48, respectively. , Through the through holes (38,48) located in the lower portion may be drawn out to the outside of the first and second cushions (30,40) again.

Here, the central portion of the fourth tether 65 is connected to the connection portion 50 of the airbag cushion to prevent the flow of the fourth tether 65 and to fix the position of the fourth tether 65 when the airbag cushion 20 is deployed. Can be partially fixed.

For example, the fourth tether 65 and the connecting portion 50 may be fixed in a sewing manner by at least one sewing line 66.

Alternatively, the fourth tether 65 and the connecting portion 50 may be fixed by an additional tether (not shown), or may be fixed to each other through a through hole formed in the additional tether.

Therefore, the present invention is to arrange the fourth tether alternately on the outer and inner surfaces of the airbag cushion, and fix both ends of the fourth tether to the seat, thereby limiting the deployment shape so that the airbag cushion does not spread to both sides. By improving the side stiffness of the second cushion, it is possible to improve the deployment performance of the airbag cushion.

On the other hand, in the above embodiments, it has been described that the limiting means is separately provided with the first to fourth tethers and the limiting member, but the present invention is not necessarily limited thereto.

That is, the present invention may be modified to simultaneously apply two or more of the first to fourth tethers and the limiting member to the limiting means.

Although the invention made by the present inventors has been described in detail according to the above-described embodiments, the present invention is not limited to the above-described embodiments, and it is needless to say that the invention can be changed in various ways without departing from the gist thereof.

The present invention is applied to the technology of an airbag device for a vehicle that secures the occupant by restraining both sides and the front of the occupant around both shoulders of the occupant by inflating and deploying a shawl-shaped airbag cushion installed on the back of the seat in the event of a collision of the vehicle.

10: car airbag device
11: seat 12: backrest
13: headrest 14: seat frame
15: seat belt 16: center pillar
17: buckle 18: near side airbag
20: airbag cushion 21: inflator
30: first cushion 301 to 303: lower wall, front wall, rear wall
31,32: inner and outer panels 33,34: first and second chambers
35: first chamber wall 36: first introduction
37,47: Non-expansion area 38,48: Through hole
40: second cushion 401-403: lower wall, front wall, rear wall
41,42: inner and outer panels 43,44: 3rd and 4th chambers
45: second chamber wall 46: second introduction
50: connection 51: third chamber wall
60: limiting means 61 to 63,65: first to fourth tether
64: limited member 66: sewing line

Claims (10)

An airbag cushion that is deployed toward both sides and the front of the occupant so as to wrap and restrain the entire upper body around the shoulders of both sides of the occupant when the vehicle crashes,
An inflator that generates gas by an impact detection signal when a vehicle crashes, and supplies it to the airbag cushion.
And limiting means for limiting the deployment shape of the airbag cushion,
The airbag cushion is installed on the back of the seat where the occupant sits,
It is formed in a shawl shape including first and second cushions that are expanded and deployed forward and downward and downward from both upper ends of the backrest and connecting portions connecting the upper ends of the first and second cushions,
The connecting portion is disposed on the rear side of the headrest so as to increase the strength of the airbag cushion using the support force of the headrest installed on the top of the backrest,
The limiting means is a vehicle airbag device characterized in that to limit the deployment shape to prevent the first and second cushions that are deployed to both sides of the occupant from spreading on both sides. delete According to claim 1,
The limiting means is provided with a pair of first tethers having an upper end connected to a front end or a lower end of the first and second cushions and a lower end connected to a seat, the airbag device of a vehicle. According to claim 1,
The limiting means is provided with a pair of second tethers, the upper end of which is connected to the non-expansion area formed in the first and second cushions, and the lower end of which is connected to the seat. According to claim 1,
The limiting means is connected to the upper end of the first and second cushions,
The airbag device of a vehicle, characterized in that it is provided with a pair of third tethers through which a through hole formed in the first and second cushions penetrates and a lower end is connected to a seat. According to claim 1,
The limiting means is disposed along the outer surface of the airbag cushion, and includes a limiting member having both ends connected to the seat,
The limiting member is disposed on the upper portion of the airbag cushion, the airbag device of the vehicle, characterized in that the portion disposed on the connecting portion connecting the first and second cushions has a wider width than both ends. The method of claim 6,
The airbag device of the vehicle, characterized in that the central portion of the limiting member is fixed to the outer surface of the connecting portion in a sewing manner. According to claim 1,
The limiting means is alternately arranged on the outer and inner surfaces of the airbag cushion, and includes a fourth tether having both ends connected to the seat,
The central portion of the fourth tether is disposed on the top of the airbag cushion and is disposed on the outer surface of the connecting portion connecting the first and second cushions,
Both sides of the fourth tether are inserted into the first and second cushions through the through holes formed in the first and second cushions, respectively, and drawn out again to limit the deployment shapes of the first and second cushions. Airbag device of a vehicle, characterized in that. According to claim 1,
The limiting means includes a pair of first tethers having an upper end connected to a front end or a lower end of the first and second cushions and a lower end connected to a seat,
A pair of second tethers having an upper end connected to a non-expansion area formed in the first and second cushions and a lower end connected to a seat,
A pair of third tethers having an upper end connected to the front end portions of the first and second cushions and penetrating through holes formed in the first and second cushions and connecting the lower end to the seat,
The central portion disposed at the connection portion connecting the first and second cushions is manufactured to have a wider width than both ends, and is disposed along the outer surface of the airbag cushion, and both ends are limited members connected to the seat and
Airbag device of a vehicle, characterized in that it is arranged alternately on the outer and inner surfaces of the airbag cushion, and includes at least two of the fourth tethers at which both ends are connected to the seat. The method of claim 8 or 9,
The fourth tether is partially fixed with the connection portion of the airbag cushion to prevent flow when the airbag cushion is deployed.

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