JP4075463B2 - Head protection airbag and head protection airbag device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an airbag for protecting the head of an automobile occupant, and more particularly to an airbag that inflates along a window of a side door or the like at the time of a side collision or rollover of the automobile. Moreover, this invention relates to the head protection airbag apparatus provided with this airbag.
[0002]
[Prior art]
The airbag for protecting the head of an automobile occupant is disposed near the crossing corner between the ceiling and the side surface of the interior of the automobile, and is inflated along the window of the side door by the gas introduced from the gas inlet. It is configured.
[0003]
[Problems to be solved by the invention]
When the vehicle rolls over, the head protection airbag needs to maintain a high internal pressure for a relatively long time.
[0004]
The present invention provides a head protection airbag that keeps the internal pressure high for a long time and also has a large amount of shock absorption, and a head protection airbag device including the head protection airbag. Objective.
[0005]
[Means for Solving the Problems]
Head protection air bag 請 Motomeko 1, in inflatable head protection air bag along the side of the passenger compartment, always communicates with cushion chamber, at one side the cushion chamber expanded by the gas is introduced A tubular inner pressure control chamber with the other end extending in a spiral shape, and a head protection airbag in which the gas in the cushion chamber flows into the tubular inner pressure control chamber. The first sheet facing the side of the passenger compartment and the second sheet facing the passenger compartment are overlapped, and these sheets are joined to each other by a linear coupling portion, whereby a gas introduction duct, a gas passage, and the cushion chamber And the internal pressure control chamber is formed, and the cushion chamber includes a front cushion chamber and a rear cushion chamber of the airbag. The duct is disposed on the rear end side of the airbag and communicates with the cushion chamber on the rear side, and the gas passage extends substantially in the front-rear direction along the upper edge of the airbag. The upper portions of the cushion chambers communicate with each other, and the one end side of the internal pressure control chamber communicates with the rear edge of the front cushion chamber.
The head protection airbag according to claim 2 is a head protection airbag that is inflatable along a side surface of the vehicle interior, and a cushion chamber that is inflated when gas is introduced, and one end side always communicates with the cushion chamber. A tubular inner pressure control chamber whose other end extends in a zigzag shape in the front-rear direction, and a head protection airbag in which gas in the cushion chamber flows into the tubular inner pressure control chamber, The bag overlaps the first sheet facing the passenger compartment side and the second sheet facing the passenger compartment, and these sheets are joined to each other by a linear coupling portion, whereby a gas introduction duct, a gas passage, A cushion chamber and an internal pressure control chamber are formed. The cushion chamber includes a cushion chamber on the front side of the airbag and a cushion on the rear side. And the duct is disposed on the rear end side of the airbag and communicates with the cushion chamber on the rear side, and the gas passage is substantially along the upper edge of the airbag. It extends in the front-rear direction and communicates with the upper portions of the cushion chambers, and the one end side of the internal pressure control chamber communicates with the rear edge of the front cushion chamber .
[0006]
And the head protection air bag, a head-protecting air bag device is formed by providing a gas generating means for inflating the head portion protecting air bag (claim 3).
[0007]
In the head protecting airbag and apparatus of the present invention, the cushion chamber is inflated by the gas from the gas generating means. When the occupant's head hits the expanded cushion chamber and the gas pressure in the cushion chamber rises, gas is gradually introduced from the cushion chamber into the internal pressure control chamber, and the impact of the occupant's head is absorbed.
[0008]
In this head protection airbag, the gas in the cushion chamber flows out to the internal pressure control chamber, and the gas in the cushion chamber does not drain out of the head protection airbag, so the gas flows out to the internal pressure control chamber. Even so, the head protection airbag maintains a sufficient internal pressure for a long time .
[0009]
Pressure control chamber 請 Motomeko 1 extends spirally. Further, the internal pressure control chamber according to claim 2 extends in a zigzag shape. By adjusting the length and diameter of the internal pressure control chamber, the shock absorption amount of the head and the like can be adjusted.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Reference examples and embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a head protection airbag according to a reference example, and FIG. 2 is an enlarged front view of a main part of the head protection airbag .
[0011]
For reference example shown in the first and second figures described. This head protection airbag (hereinafter also referred to simply as “airbag”) 10 is disposed in a folded state, for example, along the roof side portion from the A pillar to the C pillar of the automobile. Inflated and deployed in the form of a curtain along the side of the passenger compartment when the vehicle crashes or rolls over, receives the head of the front and rear passengers in the passenger compartment, and the passenger head hits the side of the passenger compartment, It is prevented from being thrown out of the vehicle through a window opening or the like.
[0012]
The airbag 10 is composed of two substantially identical sheets (only one side is shown in FIGS. 1 and 2) 11 and 11 which form two surfaces facing the vehicle compartment side and the vehicle compartment, respectively. The seats 11 and 11 are joined to each other by the linear joining portions 12 to 14 and the annular joining portions 15 to 19, whereby the gas passage 20, the cushion chambers 21 to 23, and the internal pressure control chamber (hereinafter simply referred to as “chamber”). 24) and 25 are formed.
[0013]
That is, the linear coupling portion 12 extends so as to substantially circulate the airbag 10, but is substantially upward upward along the upper edge of the front end side 10 </ b> F from the lower edge of the front end side 10 </ b> F of the airbag 10. It extends in a U-shape, thereby partitioning a cushion chamber 21 that is elongated along the upper edge of the front end side 10F and a cushion chamber 22 in the center of the front end side 10F.
[0014]
Further, the linear coupling portion 12 turns upward from the lower edge near the front end side 10F near the front-rear direction center portion of the airbag 10 and turns backward before reaching the upper edge of the airbag 10, After extending along the upper edge, the direction is changed downward to reach the lower edge of the airbag 10. Thereby, the cushion chamber 22 on the front side of the airbag 10, the non-inflatable portion 26 near the center, and the cushion chamber 23 on the rear side are formed. A gas passage 20 is formed along the upper edge of the airbag 10 to communicate the cushion chambers 21 and 23 with a duct 27 described later.
[0015]
The linear coupling portion 12 is detoured in a substantially C shape so as to enter the non-inflatable portion 26 on the way to the upper edge of the airbag 10 along the rear edge of the cushion chamber 22. A chamber 24 that can communicate with the chamber 22 is formed. Further, even in the middle of reaching the lower edge of the airbag 10 along the front edge of the cushion chamber 23, the linear coupling portion 12 is detoured in a substantially C shape so as to enter the non-inflatable portion 26. A chamber 25 that can communicate with the cushion chamber 23 is formed.
[0016]
The cushion chamber 22 is subdivided by a linear coupling portion 13, and the cushion chamber 23 is subdivided by a linear coupling portion 14. Further, both ends of the linear coupling portions 13 and 14 are connected to the annular coupling portions 15 and 16 and 17 and 18 so as to reinforce the vicinity of both ends of the linear coupling portions 13 and 14.
[0017]
The linear coupling portion 12 is disconnected on the rear end side 10 </ b> R of the airbag 10, and both ends thereof extend in parallel to the rear of the airbag 10. Thus, a gas introduction duct 27 is formed on the rear end side 10 </ b> R of the airbag 10. A gas generator (not shown) for inflating the airbag 10 is connected to the duct 27.
[0018]
Each of the linear coupling portions 12 to 14 and each of the annular coupling portions 15 to 19 couples the seats 11 and 11 in an airtight manner, and even if the internal pressure of the airbag 10 rises to the design upper limit pressure, the seats 11 and 11 communicate with each other. It is formed by strong coupling means that does not separate (for example, stitching with a high-strength sewing thread, bonding with an adhesive with high adhesive strength, or welding).
[0019]
In the airbag 10, the sheets 11 and 11 are bonded to each other by an adhesive 28 at a boundary portion between the cushion chamber 22 and the chamber 24 and a boundary portion between the cushion chamber 23 and the chamber 25, respectively.
[0020]
The adhesive 28 has an adhesive strength that peels or breaks to release the adhesion when a force of a predetermined value or more acts in a direction in which the sheets 11 are separated from each other.
[0021]
More specifically, the adhesive 28 joins the sheets 11 and 11 after the airbag 10 is inflated and until the head of the passenger hits the airbag 10. The passenger's head collides with the inflated airbag 10 and the pressure in the airbag 10 rises, thereby increasing the force in the direction of separating the sheets 11 and 11 applied to the adhesive 28 to the “predetermined value” or more. Then, the adhesive 28 releases the bonding between the sheets 11 and 11.
[0022]
The adhesive 28 is applied in the form of a plurality of dots arranged intermittently along the boundary portion between the cushion chamber 22 and the chamber 24 and the boundary portion between the cushion chamber 23 and the chamber 25.
[0023]
A plurality of protruding pieces 29 extend from the upper edge, front edge, and rear edge of the airbag 10. Each protrusion 29 is provided with a hole 30 for insertion of a bolt or the like. The airbag 10 is fastened to the vehicle body through bolts or the like in the holes 30.
[0024]
The airbag 10 has a front end side 10F disposed in the vicinity of the A pillar, a rear end side 10R disposed in the vicinity of the C pillar, and an upper edge disposed in the roof side portion. Note that the airbag 10 is fastened to the roof side rail via the projecting piece 29 in a state where the airbag 10 is folded in an elongated shape so as to extend in the longitudinal direction of the vehicle body.
[0025]
The folded body of the airbag 10 arranged in this way is covered with a cover body such as a pillar trim or a roof trim. The cover body is configured to allow the airbag 10 to be deployed in the vehicle interior by being pushed open by the airbag 10 when the airbag 10 is inflated.
[0026]
Next, the operation of the head protecting airbag device having the airbag 10 configured as described above will be described.
[0027]
When the automobile collides sideways or rolls over, the gas generator is activated to supply gas into the cushion chambers 21, 22, 23 of the airbag 10, and the airbag 10 is inflated. The airbag 10 pushes open the cover body and spreads downward in a curtain shape along the side of the passenger compartment, and expands between the passenger of the automobile and the side of the passenger compartment. The inflated airbag 10 prevents an occupant from directly hitting a pillar or a window glass or being thrown out of the vehicle.
[0028]
In the head protection airbag 10, when the inflated cushion chamber 22 receives an occupant's head, the load from the head increases the internal pressure of the cushion chamber 22 to a predetermined pressure or higher. The bonding between the sheets 11 and 11 by the adhesive 28 is released, the cushion chamber 22 communicates with the chamber 24, and the gas in the cushion chamber 22 flows out into the chamber 24. Further, when the inflated cushion chamber 23 receives the head of the occupant and the internal pressure of the cushion chamber 23 increases to a predetermined pressure or higher due to the load from the head, the sheets 11 and 11 by the adhesive 28 are used. The joints are released, the cushion chamber 23 and the chamber 25 communicate with each other, and the gas in the cushion chamber 23 flows out into the chamber 25.
[0029]
Thereby, even if the head of the occupant strongly hits the cushion chambers 22 and 23, the impact applied to the head of the occupant is sufficiently absorbed.
[0030]
In the head protection airbag 10, the gas flowing into the chambers 24 and 25 remains in the chambers 24 and 25 and does not leak out of the airbag 10. Therefore, the internal pressure of each of the cushion chambers 22 and 23 is maintained at an appropriate pressure for a long time, and the airbag 10 protects the head of the occupant for a long time .
[0031]
It explained FIG. 3 and the embodiment of the head protection air bag of the present invention with reference to Figure 4. Incidentally, FIGS. 3 and 4 is an enlarged view of the second drawing similar head protection air bag.
[0032]
In these embodiments, an internal pressure control chamber that is always in communication with the cushion chamber is provided .
[0033]
In the head protection airbag 10F of FIG. 3 , the internal pressure control chamber 54 has an elongated tube shape. The chamber 54 extends in a spiral shape, and one end side communicates only with the cushion chamber 22. The configuration of the head protecting airbag 10F other than the chamber is the same as that of the reference example .
[0034]
When the head protection airbag 10F is inflated by the gas from the gas generator, a small amount of gas flows into the chamber 54 before it hits the passenger's head. When the passenger's head hits the cushion chambers 22 and 23 and the internal pressure of the cushion chambers 22 and 23 rises, the gas in the cushion chamber 22 flows out into the chamber 54 and the impact applied to the passenger's head is absorbed.
[0035]
In FIG. 3 , the chamber 54 communicates only with the cushion chamber 22, but it may communicate with both the cushion chambers 22 and 23.
[0036]
Further, in the chamber 54 Figure 3 is a spiral, may be a zigzag shape as shown in Figure 4.
[0037]
In the head protection airbag 10G shown in FIG. 4 , the internal pressure control chamber 56 has an elongated tube shape, and is formed in a zigzag shape (zigzag folded shape) extending in the left-right direction. One end of the chamber 56 communicates with the cushion chamber 22, but may communicate with both the cushion chambers 22 and 23 .
[0038]
When the head-protecting air bag 10 G of FIG. 4 is inflated by the gas from the gas generator, a small amount of gas flows into the chamber 5 6 Before impinging the passenger's head. Per occupant head cushion chamber 22, the internal pressure of the cushion chamber 22 is increased, the gas cushion chamber flows out into the chamber 5 6, an impact applied to the occupant head portion is absorbed.
[0039]
In the FIGS. 3 and 4 the tubular chamber 54,5 6 of Figure, by adjusting the diameter or length of the inlet of the bore and the tubular chamber 54,5 6, to adjust the shock absorption be able to.
[0040]
3 and 4 are examples of the head protection airbag of the present invention, and it is obvious that other forms may be adopted. For example, although not shown, a small chamber having an enlarged tube shape may be provided in the middle or at the end in the extending direction of the tubular chamber. In addition, two or more internal pressure control chambers may be provided in one cushion chamber, and two or more cushion chambers may be communicated with a plurality of common internal pressure control chambers.
[0041]
Position and shape of the pressure control chamber, the size is clearly not limited to those illustrated in FIGS. 3 and 4. Moreover, it is also clear that the communication position (connection position) between the internal pressure control chamber and the cushion chamber may be other than shown in the head protection airbag of the present invention.
[0042]
【The invention's effect】
As described above, according to the present invention, there is provided a head protection airbag and apparatus that can sufficiently absorb an impact applied to the head of an occupant.
[Brief description of the drawings]
FIG. 1 is a front view of a head protection airbag according to a reference example.
2 is an enlarged view of a main part of the head protection airbag of FIG. 1. FIG.
FIG. 3 is a front view of a main part of the head protection airbag according to the first embodiment .
FIG. 4 is a front view of an essential part of a head protection airbag according to a second embodiment .
[Explanation of symbols]
10 , 10 F , 10 G head protection airbag 1 1 seat 21, 22, 23 Cushion chamber
5 4, 5 6 Internal pressure control chamber

Claims (3)

In the head protection airbag that is inflatable along the side of the vehicle interior,
A cushion chamber that expands when gas is introduced;
One end side always communicates with the cushion chamber, and the other end side is provided with a tube-like internal pressure control chamber extending in a spiral shape,
A head protection airbag in which gas in the cushion chamber flows into the tubular internal pressure control chamber,
The airbag includes a first sheet facing the side of the passenger compartment and a second sheet facing the passenger compartment, and these sheets are joined to each other by a linear coupling portion, whereby a gas introduction duct and a gas passage are provided. The cushion chamber and the internal pressure control chamber are formed,
As the cushion chamber, a front cushion chamber and a rear cushion chamber of the airbag are formed,
The duct is disposed on the rear end side of the airbag and communicates with the cushion chamber on the rear side.
The gas passage extends substantially in the front-rear direction along the upper edge of the airbag, and communicates between the upper portions of the cushion chambers.
A head protection airbag characterized in that the one end side of the internal pressure control chamber communicates with a rear edge of the front cushion chamber. In the head protection airbag that is inflatable along the side of the vehicle interior,
A cushion chamber that expands when gas is introduced;
One end side is always in communication with the cushion chamber, and the other end side is provided with a tubular internal pressure control chamber extending in a zigzag shape in the front-rear direction,
A head protection airbag in which gas in the cushion chamber flows into the tubular internal pressure control chamber,
The airbag includes a first sheet facing the side of the passenger compartment and a second sheet facing the passenger compartment, and these sheets are joined to each other by a linear coupling portion, whereby a gas introduction duct and a gas passage are provided. The cushion chamber and the internal pressure control chamber are formed,
As the cushion chamber, a front cushion chamber and a rear cushion chamber of the airbag are formed,
The duct is disposed on the rear end side of the airbag and communicates with the cushion chamber on the rear side.
The gas passage extends substantially in the front-rear direction along the upper edge of the airbag, and communicates between the upper portions of the cushion chambers.
A head protection airbag characterized in that the one end side of the internal pressure control chamber communicates with a rear edge of the front cushion chamber. A head protection airbag device comprising: the head protection airbag according to claim 1 or 2; and gas generating means for generating a gas for inflating the head protection airbag.

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