KR20190024131A - Airbag apparatus - Google Patents

Abstract

The present invention discloses an airbag apparatus. The airbag apparatus of the present invention includes: a first chamber connected to an inflator to support an occupant head upon frontal collision of a vehicle; a second chamber connected to one side of the first chamber in order to be supported by the first chamber to prevent the occupant head from diagonally moving upon oblique collision of the vehicle; a communication tube provided in the first chamber to allow gas of the first chamber to be introduced into the second chamber, and having an annular tightening channel formed along a periphery of the communication tube; and a valve tether including a tether hook provided to pass through the inside of the tightening channel, and a tether puller connected to the tether hook to pull the tether hook in one direction and connected to the first chamber to pull the tether hook to close the communication tube when a deployment of the first chamber is completed.

Description

AIRBAG APPARATUS

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an airbag device, and more particularly, to an airbag device capable of restraining a head of a passenger from diagonally moving or rotating in an oblique collision of a vehicle.

Generally, the vehicle is equipped with an air bag to protect the occupant. The airbag is deployed at various locations depending on the occupant's protection. A driver's seat airbag is installed on the steering wheel to protect the driver's head. A passenger's seat airbag is installed on the front side of the vehicle to protect the head of the passenger sitting next to the driver.

At the front or side collision of the vehicle, the primer of the inflator is detonated by the electronic control module. When gas is generated in the inflator, the airbag cushion is inflated by the generated gas. As the regulation of the vehicle for occupant protection is strengthened, the size of the airbag cushion is increased.

However, if the gas leaks from the airbag cushion after the airbag cushion is fully inflated, the supporting force or inflation force of the airbag cushion is lowered. In this case, it may be difficult to prevent the head of the occupant from diagonally moving in the airbag cushion.

Further, when the size of the airbag cushion is increased, the inflation time of the airbag cushion is increased, so that the restraint time of the head is delayed when the vehicle is inclined. If the airbag cushion restrains the head's restraint time, the diagonal movement of the head can not be suppressed, resulting in injury to the head or neck.

Therefore, there is a need to improve this.

It is an object of the present invention to provide an airbag device capable of restraining the head of the occupant from diagonally moving or rotating when the vehicle is inclined to collide with the vehicle.

An airbag device according to the present invention comprises: a first chamber connected to an inflator and supporting a head of a passenger in a frontal collision of the vehicle; A second chamber connected to one side of the first chamber so as to be supported by the first chamber and restraining a head of the occupant from diagonally moving in an oblique collision of the vehicle; A communication tube formed in the first chamber to allow the gas in the first chamber to flow into the second chamber and having an annular fastening channel portion formed along the periphery thereof; And a tether collar portion installed to pass through the inside of the tightening channel portion and connected to the tether collar portion so as to pull the tether collar portion in one direction. When the first chamber is completely deployed, the tether collar portion is pulled And a tether pulling portion connected to the first chamber to close the communication tube.

The second chamber may be biasedly disposed on the inboard side of the first chamber to avoid a head of the occupant in a frontal collision of the vehicle.

The fastening channel portion may be formed with a through hole so that the tether pulling portion is pulled out of the fastening channel portion.

And a tightening ring portion may be formed on one side of the tether ring to allow the tether pulling portion to pass therethrough.

The tightening ring portion may be movably disposed in the tightening channel portion.

The tightening ring part may be fixed to the tightening channel part by a first fixed sewing part.

The tether hooks may be respectively connected to both sides of the tether loop so as to pass through the through holes.

One side of the tether ring part is fixed to the tightening channel part by a second fixed sewing part, and the tether pulling part can be connected to the other side of the tether loop part.

According to the present invention, the second chamber is connected to one side of the first chamber so as to be supported by the first chamber, and restrains the head of the occupant from diagonally moving in an oblique collision of the vehicle. Therefore, it is possible to prevent the head of the occupant from being rotated while being pushed to one side of the second chamber, and to prevent the head from being separated from the second chamber. In addition, since the rotation of the head is prevented when the vehicle is inclined, it is possible to prevent injuries to the head and the neck.

Further, according to the present invention, the second chamber is biasedly disposed on the inboard side of the first chamber so as to avoid the head of the occupant in the frontal collision of the vehicle. Therefore, even if the second chamber is expanded while being expanded toward the rear side in the frontal collision of the vehicle, the neck of the occupant can be prevented from being bent backward or injured by the second chamber.

Further, according to the present invention, the tether pulling portion pulls the tether collar to close the communication tube, so that the tether collar can prevent the communication tube from spreading as the communication tube is tightly tightened. Therefore, it is possible to prevent the gas from leaking from the second chamber and to prevent the expansion or the supporting force of the second chamber from being lowered, thereby increasing the supporting force of the second chamber upon collision of the head and suppressing the diagonal movement of the head can do.

1 is a plan view showing an airbag apparatus according to an embodiment of the present invention.
2 is a front view showing an airbag apparatus according to an embodiment of the present invention.
3 is an exploded view of an airbag device according to an embodiment of the present invention.
4 is a cross-sectional view illustrating a state in which a second chamber is installed in a first chamber in a folded state in an airbag device according to an embodiment of the present invention.
5 is a front view showing another example of the connection tether in the airbag device according to the embodiment of the present invention.
6 is a perspective view showing a first embodiment of a valve tether in an airbag device according to an embodiment of the present invention.
7 is a cross-sectional view showing a first embodiment of a valve tether in an airbag device according to an embodiment of the present invention.
8 is a longitudinal sectional view showing a first embodiment of a valve tether in an airbag device according to an embodiment of the present invention.
9 is a perspective view showing a state in which the communication tube is closed by the first embodiment of the valve tether of the airbag device according to the embodiment of the present invention.
10 is a perspective view showing a second embodiment of a valve tether in an airbag device according to an embodiment of the present invention.
11 is a cross-sectional view showing a second embodiment of a valve tether in an airbag device according to an embodiment of the present invention.
12 is a perspective view showing a third embodiment of a valve tether in an airbag device according to an embodiment of the present invention.
13 is a cross-sectional view showing a third embodiment of a valve tether in an airbag device according to an embodiment of the present invention.
14 is a perspective view showing a fourth embodiment of a valve tether in an airbag device according to an embodiment of the present invention.
15 is a cross-sectional view showing a fourth embodiment of a valve tether in an airbag device according to an embodiment of the present invention.
FIG. 16 is a configuration diagram showing a state in which an abutment portion of a second chamber is separated during an oblique collision of a vehicle in an airbag device according to an embodiment of the present invention. FIG.
17 is a configuration diagram showing a state in which the first chamber and the second chamber are inflated in the airbag device according to an embodiment of the present invention.
18 is a configuration diagram showing a state in which the second chamber is completely deployed in the airbag device according to the embodiment of the present invention.
FIG. 19 is a configuration diagram showing a state in which the first chamber and the second chamber are fully developed in the airbag device according to the embodiment of the present invention. FIG.
FIG. 20 is a configuration diagram showing a state in which a head of an occupant collides with a second chamber in an airbag device according to an embodiment of the present invention. FIG.
FIG. 21 is a configuration diagram showing a state in which a head collides with a first chamber in a frontal collision of a vehicle in an airbag device according to an embodiment of the present invention. FIG.

Hereinafter, an embodiment of an airbag apparatus according to the present invention will be described with reference to the accompanying drawings. In the course of describing the airbag apparatus, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

FIG. 1 is a plan view showing an airbag apparatus according to an embodiment of the present invention, FIG. 2 is a front view showing an airbag apparatus according to an embodiment of the present invention, and FIG. 3 is a plan view showing an airbag apparatus according to an embodiment of the present invention. 4 is a cross-sectional view illustrating a state in which the second chamber is installed in the first chamber in a state where the second chamber is folded in the airbag apparatus according to the embodiment of the present invention, and FIG. 5 is a cross- Fig. 3 is a front view showing another example of the connection tether in the airbag device according to the first embodiment.

1 to 5, an airbag apparatus according to an embodiment of the present invention includes a first chamber 20, a second chamber 30, a communication tube 51, and a valve tether 60.

The first chamber 20 is connected to the inflator 10 and supports the head H at the frontal collision of the vehicle. The first chamber 20 may be formed in the form of a square box when the development is completed. The first chamber 20 is supported by a front instrument panel (not shown) inside the vehicle.

The second chamber 30 is connected to the first chamber 20 by the second sewing part 35. The second sewing part 35 is formed in a rectangular shape along the periphery of the second chamber 30. [

The second chamber 30 is connected to the rear side of the first chamber 20 so as to be supported by the first chamber 20 and suppresses the diagonal movement of the head H of the occupant in the event of an oblique collision of the vehicle . The second chamber 30 supports one side of the head H while blocking one side of the head H so that the head H of the occupant is pushed to one side of the second chamber 30, And the restraint time of the head H can be shortened. It is possible to prevent the head H and the neck from being injured because the rotation of the head H is prevented when the vehicle is inclined and collided. Further, the size of the first chamber 20 may not be increased or the size increase may be minimized in order to protect the occupant's head H.

The second chamber 30 is disposed on the inboard side of the first chamber 20 so as to avoid the head H of the occupant in a frontal collision of the vehicle. The inboard side refers to the center side of the vehicle in the width direction. The width of the second chamber 30 (the width direction length of the vehicle) is less than half the width of the first chamber 20. The neck is prevented from being pushed rearward by the second chamber 30 even if the second chamber 30 is deployed while being expanded while being rearwardly deployed in the frontal collision of the vehicle so that the neck is bent backward by the second chamber 30 Or injury to the user.

The periphery of the first chamber 20 is sewn by the first sewing part 21. [ The reinforcing sewing portion 23 is sewn on the upper end of the first chamber 20. Since the upper end of the first chamber 20 is sewed by the reinforced sewing part 23, the upper end of the first chamber 20 can be protected from external impacts.

The end of the folded portion 31 of the second chamber 30 is stuck to the first chamber 20. The second chamber 30 is folded in a state in which one side of the second chamber 30 is inflow. The folded portion 31 of the second chamber 30 may be folded once or folded a plurality of times. The folded portion 31 of the second chamber 30 is arranged to face the inboard side of the vehicle. The length of the second chamber 30 can be increased compared with the case where the second chamber 30 is installed without being folded since one side of the second chamber 30 is folded in a state of being introduced into the inside. The expansion height of the second chamber 30 can be sufficiently increased when the second chamber 30 is expanded while being expanded so that the head H of the occupant can be quickly restrained. Therefore, it is possible to restrain the head H of the occupant from being restrained by the second chamber 30 to rotate or diagonally move when the vehicle is inclined.

The folded portion 31 of the second chamber 30 is joined to the first chamber 20 so that when the second chamber 30 is expanded while being expanded, ) Is developed.

During the bending of the first chamber 20, the folded portion 31 of the second chamber 30 is stuck to the first chamber 20. Therefore, the second chamber 30 can be brought into contact with the first chamber 20 through one sewing process, so that the manufacturing time and cost of the airbag apparatus can be reduced.

The valve tether 60 is disposed to be inclined toward the widthwise center side of the first chamber 20. At this time, the valve tether 60 is fixed to the first chamber 20 by the valve sewing section 67. When the expansion height of the first chamber 20 is constant, if the valve tether 60 is inclined toward the center of the second chamber 30, the installation length of the valve tether 60 is increased. In addition, when the valve tether 60 is installed in a direction perpendicular to the first chamber 20, the installation length of the valve tether 60 is reduced.

 If the length of the tether pulling portion 65 is too short, the communication tube 51 is closed before the first chamber 20 is fully deployed. Further, if the length of the tether pulling portion 65 is too long, the communication tube 51 is not completely closed even after the development of the first chamber 20 is completed. Since the tether pulling portion 65 is arranged to be inclined toward the center of the width direction of the first chamber 20 in view of the expansion height of the first chamber 20 in the embodiment of the present invention, Can be adjusted. Therefore, the tether pulling portion 65 can be installed so as to completely close the communication tube 51 when the first chamber 20 is completely deployed.

The airbag device further includes a connection tether 40 connecting the first chamber 20 and the second chamber 30 so as to limit the spread of the second chamber 30 to the inboard side during deployment of the second chamber 30. [ do. At this time, one end of the connection tether 40 may be connected to the first chamber 20 at a position spaced apart from the second chamber 30 or may be connected to the second sewing unit 35 of the second chamber 30. The connection tether 40 applies a tensile force to the second chamber 30 so as to pull the second chamber 30 toward the first chamber 20 when the first chamber 20 and the second chamber 30 expand.

The connecting tether 40 and the second chamber 30 are gradually deformed while absorbing the load of the head H when the vehicle is inclined. That is, the head H is primarily restrained by the second chamber 30 after being primarily restrained by the connecting tether 40. [ Therefore, since the restraint time of the head H is shortened when the vehicle is inclined, the rotation of the head H is prevented, thereby preventing the head H or the neck from being injured.

When the head H is diagonally moved in the diagonal direction of the vehicle at the time of an oblique collision of the vehicle, the connecting tether 40 moves the second chamber 30 by the supporting force (reaction force) of the first chamber 20 It is possible to prevent the head H from moving out of the second chamber 30 or coming off. Therefore, the size of the first chamber 20 and the second chamber 30 may not be increased to protect the head H.

When the head H applies a load to the connecting tether 40 and the first chamber 20 in the frontal collision of the vehicle, the connecting tether 40 and the first chamber 20 gradually move the load H Lt; / RTI > At this time, when the first chamber 20 is contracted forward by the load of the head H, the reaction force of the second chamber 30 pulls the connection tether 40, The tensile force of the first chamber 40 and the reaction force of the second chamber 30.

The connection tether 40 is disposed on the rear side of the first chamber 20 and on the rear side of the second chamber 30 so that the head H is in contact. Therefore, when the head H is collided with the first chamber 20 or the second chamber 30, the connection tether 40 can primarily buffer the load of the head H. [

The connecting tether 40 may be a surface tether 41 covering one side of the rear side of the first chamber 20 and a part of the rear side of the second chamber 30 (see FIG. 2). One side of the rear side of the first chamber 20 and one side of the rear side of the second chamber 30 are portions in which the head H directly contacts. Both sides of the cotton tether 41 are connected to the first chamber 20 and the second chamber 30 by the connecting sewing part 45. The cotton tether 41 means a rectangular or elliptical tether whose width is smaller than its length. When the connecting tether 40 is the cotton tether 41, since the cotton tether 41 comes into contact with the impact portion of the head H almost uniformly, it is possible to prevent the pressure from concentrating on a specific portion of the head H . Therefore, it is possible to prevent the head H from being injured by the connecting tether 40.

The connection tether 40 may be a plurality of linear tethers 42 connecting the first chamber 20 and the second chamber 30 (see FIG. 5). The connection tether 40 may also be a linear tether 42 connecting the first chamber 20 and the second chamber 30. Both sides of the linear tether 42 are connected to the first chamber 20 and the second chamber 30 by the connecting sewing part 45. The linear tether 42 refers to a tether in the form of a string or band formed elongated. The number of the linear tethers 42 may be appropriately designed according to the height of the first chamber 20 and the second chamber 30 or the size of the vehicle.

A first embodiment of a valve tether of an airbag apparatus according to an embodiment of the present invention will be described.

FIG. 6 is a perspective view showing a first embodiment of a valve tether in an airbag device according to an embodiment of the present invention, and FIG. 7 is a perspective view showing a first embodiment of a valve tether in an airbag device according to an embodiment of the present invention. 8 is a longitudinal sectional view showing a first embodiment of a valve tether in an airbag apparatus according to an embodiment of the present invention, and Fig. 9 is a longitudinal sectional view of a valve tether of an airbag apparatus according to an embodiment of the present invention. 1 is a perspective view showing a state in which a communication tube is closed by an embodiment;

6 to 9, an annular fastening channel portion 52 is formed at the periphery of the communication tube 51. As shown in Fig. The communication tube 51 may be formed of the same material as the material of the first chamber 20. The communication tube 51 may be formed of a different material from the first chamber 20 and then sewn to the first chamber 20. The communication tube 51 may be formed in various shapes such as a cylindrical shape, a polygonal tube shape, and the like.

The communication tube 51 is formed in the first chamber 20 such that the gas of the first chamber 20 flows into the second chamber 30 and an annular fastening channel 52 is formed along the periphery. The tightening channel portion 52 is formed by joining the end portion of the communication tube 51 by the channel sewing portion 54 in a state where the end portion of the communication tube 51 is overlapped in two layers in the longitudinal direction of the communication tube 51.

The through hole portion 53 is formed in the tightening channel portion 52 so that the tether pulling portion 65 is pulled out to the outside of the tightening channel portion 52. When the tether pulling portion 65 pulls the tether loop portion 61, the tether loop portion 61 is pulled out through the through hole portion 53 and the communication tube 51 is tightened and closed.

The valve tether (60) includes a tether collar (61) and a tether pulling portion (65).

The tether collar 61 is provided so as to pass through the inside of the tightening channel part 52. [ A tightening ring portion 62 is formed on one side of the tether ring 61 so that the tether pulling portion 65 is passed therethrough. At this time, one side of the tether loop 61 may be overlapped in two layers, and the overlapping portion of the tether loop 61 may be sewn or fixed with a clip or the like to form the tightening ring 62. [ The tightening ring portion 62 is movably installed inside the tightening channel portion 52. Therefore, when the tether pulling-out portion 65 is pulled, the pulling-out ring portion 62 can be moved in the pull-down channel portion 52.

The tether pulling part (65) is connected to the other side of the tether loop part (61) so as to pull the tether loop part (61). The tether pulling portion 65 is connected to the first chamber 20 so as to pull the tether loop 61 in one direction to close the communication tube 51 when the development of the first chamber 20 is completed.

The tether loop portion 61 pulls the tether loop portion 61 to close the communication tube 51 so that the communication tube 51 is opened as the tether loop portion 61 tightens the communication tube 51 Can be prevented. Therefore, since the gas is prevented from leaking from the second chamber 30, the expansion force (supporting force) of the second chamber 30 can be prevented from being lowered. Therefore, when the head H collides with the second chamber 30, It is possible to increase the supporting force and suppress the behavior of the head H in the diagonal direction.

A second embodiment of the valve tether according to the present invention will now be described.

FIG. 10 is a perspective view showing a second embodiment of a valve tether in an airbag apparatus according to an embodiment of the present invention, and FIG. 11 is a perspective view showing a second embodiment of a valve tether in an airbag apparatus according to an embodiment of the present invention. Is a cross-sectional view.

10 and 11, the valve tether 60 includes a tether collar 61 and a tether pulling portion 65.

The tether collar 61 is provided so as to pass through the inside of the tightening channel part 52. [ The tether pulling portions 65 are respectively connected to both sides 61a and 61b of the tether loop 61 so as to pass through the through holes 53. [ The pair of tether pulling portions 65 are fixed to the first chamber 20 by the valve sewing portion 67.

Since the pair of tether pulling portions 65 simultaneously pull both sides 61a and 61b of the tether loop 61 to close the communication tube 51, even if the first chamber 20 is inflated to the same height, The lead-out length of the portion 61 is increased by a factor of two. Therefore, the tether ring 61 according to the second embodiment is simultaneously pulled by the pair of tether pulling portions 65, so that the valve tether 60 is prevented from being in contact with the valve tether 60 pulled by one tether pulling portion 65 The speed at which the tube 51 is fastened can be doubled.

The tether pulling portion 65 pulls the both sides 61a and 61b of the tether loop 61 to close the communication tube 51. As the tether loop 61 tightens the communication tube 51 The communication tube 51 can be prevented from being opened. Therefore, it is possible to prevent the gas from leaking from the second chamber 30 and to prevent the expansion force (supporting force) of the second chamber 30 from being lowered.

A third embodiment of the valve tether according to the present invention will be described.

FIG. 12 is a perspective view showing a third embodiment of a valve tether in an airbag apparatus according to an embodiment of the present invention, and FIG. 13 is a perspective view showing a third embodiment of a valve tether in an airbag apparatus according to an embodiment of the present invention. Is a cross-sectional view.

12 and 13, the valve tether 60 includes a tether collar 61 and a tether pulling portion 65.

The tether collar 61 is provided so as to pass through the inside of the tightening channel part 52. [ A tightening ring portion 62 is formed on one side of the tether ring 61 so that the tether pulling portion 65 is passed therethrough. At this time, one side of the tether loop 61 may be overlapped in two layers, and the overlapping portion of the tether loop 61 may be sewn or fixed with a clip or the like to form the tightening ring 62. [ The tightening ring portion 62 is fixed to the tightening channel portion 52 by the first fixed sewing portion 63a. Therefore, it is possible to prevent the tightening ring portion 62 from moving in the tightening channel portion 52 when the tether pulling portion 61 is pulled.

 The tether pulling part (65) is connected to the other side of the tether loop part (61) so as to pull the tether loop part (61). The tether pulling portion 65 is connected to the first chamber 20 so as to pull the tether loop 61 in one direction to close the communication tube 51 when the development of the first chamber 20 is completed.

The tether loop portion 61 pulls the tether loop portion 61 to close the communication tube 51 so that the communication tube 51 is opened as the tether loop portion 61 tightens the communication tube 51 Can be prevented. Therefore, it is possible to prevent the gas from leaking from the second chamber 30 and to prevent the expansion force (supporting force) of the second chamber 30 from being lowered.

A fourth embodiment of the valve tether according to the present invention will be described.

FIG. 14 is a perspective view showing a fourth embodiment of a valve tether in an airbag device according to an embodiment of the present invention, and FIG. 15 is a perspective view showing a fourth embodiment of a valve tether in an airbag device according to an embodiment of the present invention. Is a cross-sectional view.

Referring to Figs. 14 and 15, the valve tether 60 includes a tether collar 61 and a tether pulling portion 65.

The tether collar 61 is provided so as to pass through the inside of the tightening channel part 52. [ One side of the tether collar 61 is fixed to the tightening channel 52 by the second fixed sewing part 63b. Therefore, even if the tether hook 61 is pulled by the tether pulling portion 65, one side of the tether hook 61 is not moved in the fastening channel portion 52. [

 The tether pulling part (65) is connected to the other side of the tether loop part (61) so as to pull the tether loop part (61). The tether pulling portion 65 is connected to the first chamber 20 so as to pull the tether loop portion 61 in one direction to close the communication tube 51 when the first chamber 20 is expanded.

The tether loop portion 61 pulls the tether loop portion 61 to one side to close the communication tube 51 so that the tether loop portion 61 is pushed to the communication tube 51 as the communication tube 51 tightly tightens, Can be prevented. Therefore, it is possible to prevent the gas from leaking from the second chamber 30 and to prevent the expansion force (supporting force) of the second chamber 30 from being lowered.

The operation of the airbag apparatus according to an embodiment of the present invention will be described. Hereinafter, the operation of the airbag device at the time of the vehicle collision and the frontal collision will be described in order.

First, a description will be given of a case where an oblique collision of the vehicle occurs.

FIG. 16 is a view illustrating a state in which an abutting portion of a second chamber is separated in an oblique collision of a vehicle in an airbag device according to an embodiment of the present invention, and FIG. 17 is a cross- 18 is a configuration diagram showing a state in which the second chamber is completely opened in the airbag device according to the embodiment of the present invention, and Fig. 19 is a view showing a state in which the first chamber and the second chamber are fully expanded, FIG. 20 is a schematic view showing a state in which the first chamber and the second chamber are completely deployed in the airbag device according to the embodiment of the present invention. FIG. 20 is a cross- And FIG.

Referring to FIGS. 16 to 20, gas generated in the inflator 10 is injected into the first chamber 20 at the time of an oblique collision of the vehicle. The first chamber 20 is deployed while expanding toward the rear side of the vehicle. That is, the first chamber 20 is expanded while the upper side is expanded first, and gradually the lower side is expanded. The gas in the first chamber 20 flows into the second chamber 30 through the communication tube 51. As the second chamber 30 is inflated, the abutting portion 33 of the folded portion 31 is separated (see Fig. 16).

At this time, while the first chamber 20 is being deployed, the rear side of the first chamber 20 and the communication tube 51 are moved to the rear side of the vehicle (refer to FIG. 17). Before the first chamber 20 is completely deployed, the tether loop 61 is hardly pulled by the tether pulling portion 65.

The second chamber 30 is fully deployed before the first chamber 20 (see Fig. 18). The tether pulling portion 65 of the valve tether 60 is tensed to the rear side of the vehicle since the communication tube 51 is moved away from the rear side of the first chamber 20 when the first chamber 20 is almost completely unfolded. And the tether collar 61 tightens the communication tube 51 by the tensile force of the tether pulling portion 65 (see Figs. 9 and 19). At this time, since the communication tube 51 is shielded by tightening the communication tube 51 by the tether collar 61, the gas in the second chamber 30 can be prevented from being discharged to the first chamber 20 . Therefore, it is possible to prevent the expanding force or the supporting force of the second chamber 30 from being reduced.

The head H is moved in the diagonal direction on the front side by the inclined collision of the vehicle (see Fig. 20). And presses the second chamber 30 as the head H is moved in the diagonal direction. Therefore, the second chamber 30 is brought into close contact with the head H to prevent the head H from rotating, and the restraint time of the head H can be shortened.

In addition, since the head H is prevented from rotating when the vehicle is inclined, the head H and the neck can be prevented from being injured. When the head H is slanted toward the inboard side of the vehicle, the connecting tether 40 is moved to the first chamber 20 by the supporting force F12 of the second chamber 30, (The outboard side), it is possible to prevent the head H from escaping from the second chamber 30.

On the other hand, the load of the head H is absorbed by the buffering force F1 of the second chamber 30 by the tensile force of the connecting tether 40 (F2) first when the vehicle is inclined. At this time, the connection tether 40 primarily absorbs the load of the head H by the pulling force of the first chamber 20, while the second chamber 30 is deformed by the load of the head H, (H) is secondarily absorbed. The load of the head H transmitted to the second chamber 30 is absorbed thirdarily as it is transmitted to the first chamber 20. [

Next, the frontal collision of the vehicle will be described.

FIG. 21 is a configuration diagram showing a state in which a head collides with a first chamber in a frontal collision of a vehicle in an airbag device according to an embodiment of the present invention. FIG.

Referring to FIG. 21, since the first chamber 20 is disposed on the front side of the head H, the head H is moved to the first chamber 20 in the frontal collision of the vehicle. At this time, the second chamber 30 is disposed on the inboard side of the first chamber 20 so as to avoid the head H of the occupant in a frontal collision of the vehicle. Thus, by preventing the head H from being pushed rearward by the second chamber 30 even if the second chamber 30 is deployed while expanding to the rear side in the frontal collision of the vehicle, And can be prevented from being injured.

As the first chamber 20 is deformed by the load of the head H, both sides of the connecting tether 40 are pulled by the second chamber 30. The load of the head H is primarily absorbed by the tensile force F4 of the connecting tether 40 and secondarily absorbed by the buffering force F3 of the first chamber 20. [

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand.

Accordingly, the true scope of protection of the present invention should be defined by the claims.

10: Inflator 20: First chamber
21: first sewing section 23: reinforcing sewing section
30: second chamber 31: folded portion
33: abutment part 35: chamber sewing part
40: connection tether 41: cotton tether
42: linear tether 45: connection sewing part
51: communication tube 52: tightening channel part
53: through hole portion 54: channel sewing portion
57: communication hole portion 60: valve tether
61: tether ring part 62: tightening ring part
63a: first fixed sewing part 63b: second fixed sewing part
65: tether pulling portion 67: valve sewing portion

Claims (8)

A first chamber connected to the inflator and supporting the occupant's head in a frontal collision of the vehicle;
A second chamber connected to one side of the first chamber so as to be supported by the first chamber and restraining a head of the occupant from diagonally moving in an oblique collision of the vehicle;
A communication tube formed in the first chamber to allow the gas in the first chamber to flow into the second chamber and having an annular fastening channel portion formed along the periphery thereof; And
A tether loop portion which is installed to pass through the inside of the tightening channel portion and a tether loop portion which is connected to the tether loop portion so as to pull the tether loop portion in one direction and pulls the tether loop portion when the opening of the first chamber is completed, And a tether pulling portion connected to the first chamber to close the tube.
The method according to claim 1,
Wherein the second chamber is biasedly disposed on an inboard side of the first chamber to avoid a head of the occupant in a frontal collision of the vehicle.
The method according to claim 1,
Wherein the fastening channel portion is formed with a through hole portion so that the tether pulling portion is pulled out to the outside of the fastening channel portion.
The method of claim 3,
Wherein a tightening ring portion is formed at one side of the tether collar to allow the tether pulling portion to pass therethrough.
5. The method of claim 4,
Wherein the tightening ring portion is movably disposed in the tightening channel portion.
5. The method of claim 4,
Wherein the tightening ring portion is fixed to the tightening channel portion by a first fixed sewing portion.
The method of claim 3,
And the tether pulling portions are respectively connected to both sides of the tether loop so as to pass through the through holes.
The method of claim 3,
One side of the tether loop is fixed to the tightening channel part by a second fixed sewing part,
And the tether hooking portion is connected to the other side of the tether loop.

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