JP3852412B2 - Airbag device for vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle airbag device.
[0002]
[Prior art]
For example, an airbag that protects the passenger's head at the time of a side collision or rollover is housed in the upper part of the interior of an automobile. The airbag is housed by being folded into a roll shape or a bellows shape with its upper end fixed to the side roof rail at the top of the vehicle body, and the interior of the vehicle interior is covered with a headlining. When the automobile collides or rolls over, it expands with the gas of the inflator and protects the occupant's head by deploying in the form of a curtain downward while pushing the lower end of the head lining toward the passenger compartment. It is like that.
[0003]
This type of airbag is provided with a folded portion between the vehicle body and the folded portion, and by inflating the folded portion first, the folded portion is pressed against the head lining side, and the head lining is pushed open at the folded portion. The structure is developed to the vehicle interior side (see, for example, Patent Document 1).
[0004]
[Patent Document 1]
Japanese Patent No. 3329277 (FIG. 2)
[0005]
[Problems to be solved by the invention]
However, in such a conventional technique, since the folded portion is first inflated, the folded portion of the airbag is pressed against the head lining so that the head lining is pushed open. Is unfavorable in terms of deployment speed and tends to vary in the deployment direction.
[0006]
The present invention has been made by paying attention to such a conventional technique, and provides a vehicle airbag device capable of improving the deployment speed of the airbag and stabilizing the deployment direction. is there.
[0007]
[Means for Solving the Problems]
According to the first aspect of the present invention, an airbag having an upper end fixed to the vehicle body in the front-rear direction in a space between the upper part of the vehicle body on the vehicle interior side and the interior material is formed into a roll-shaped or bellows-shaped folded portion in the vertical direction. When the airbag is inflated by the gas from the inflator, the airbag device for the vehicle deploys in a curtain shape downward while pushing the interior material to the vehicle interior side, and the upper end of the airbag The first folding part accommodated in the vehicle interior side of the folding part and the second folding part accommodated between the first folding part and the folding part are formed by folding twice between the folding part and the folding part In addition, the second folded portion is formed longer than the first folded portion, and the upper portion of the second folded portion is wrapped between the folded portion and the vehicle body, and the airbags are arranged in the front-rear direction. A plurality of expansion chambers and an upper end of the expansion chamber; In structure having a gas introduction path along the longitudinal direction of the inlet respectively communicating, second turned-back portion is characterized in that it comprises an inlet of at least the expansion chamber.
[0009]
The invention of claim 2 Symbol placement, the folded portion may from the lower side is the outer wound roll form to a roll wound up into the passenger compartment side wall.
[0010]
【The invention's effect】
According to the first aspect of the present invention, since the first folding part and the second folding part are provided on the vehicle interior side of the folding part, the first folding part and the second folding part are first expanded and expanded. The interior material can be pushed open to the vehicle interior side by the portion and the second folded portion. Therefore, the folding part is not strongly pressed against the interior material, the resistance when the folding part is deployed is reduced, the deployment speed is improved, and the deployment direction is stabilized. In addition, since the upper part of the second folding part wraps around between the folding part and the vehicle body, when the part inflates, a propulsive force in the deployment direction is generated in the folding part, and the airbag deployment speed Is further improved.
[0011]
Further , since the second folding part includes at least the inlet of the expansion chamber, the gas flows from the inlet into the expansion chamber after the second folding part is expanded, that is, the folding part is expanded by the expansion of the second folding part. Since it has been pushed out into a large space on the vehicle interior side, the inlet can be sufficiently opened to smoothly introduce gas into the expansion chamber.
[0012]
According to the second aspect of the present invention, since the folding portion is an outer winding roll shape that is rolled up from the lower end side to the vehicle compartment side wall side to form a roll shape, the folding portion is wound while approaching the vehicle body (window) side. Even if the gap between the occupant and the vehicle body is narrow, the airbag can be reliably deployed within the narrow gap.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a view of the upper part of the automobile as viewed from the vehicle interior R side, and shows a state in which the airbag 1 is deployed. Reference numeral 2 denotes a front pillar, 3 denotes a center pillar, and 4 denotes a rear pillar. A side roof rail (vehicle body) 5 having a closed cross-sectional structure is formed on the top of each pillar 2, 3, 4 along the front-rear direction. The airbag 1 has an upper end attachment piece 1a fixed along the side roof rail 5, and is housed and held in a case (not shown) in a folded state as shown in FIG. Material) 6.
[0014]
The airbag 1 is formed with two sets of three expansion chambers 7 on the front and rear. An inlet 7 a is formed at the upper end of each expansion chamber 7, and the inlet 7 a communicates with a gas introduction path 8 that extends in the front-rear direction at the top of the airbag 1. An inflator 9 is connected to the rear side of the gas introduction path 8, and the gas passes through the gas introduction path 8 and is introduced into the expansion chambers 7 from the respective inlets 7 a. A strap 10 is provided between the front end of the airbag 1 and the front pillar 2. When the airbag 1 is deployed downward, the strap 10 serves to help the airbag 1 to deploy in the front-rear direction by pulling the airbag 1 forward.
[0015]
Next, how to fold the airbag 1 will be described. The airbag 1 is formed into an outer-rolled roll shape, which is an outer-winding roll shape that is rolled up from the lower end side to the passenger compartment side wall side to form the folded portion 11. That is, “outside winding” is a method of winding one after another from the lower end side to the vehicle interior side wall side.
[0016]
Next, the portion between the roll-shaped folding part 11 wound up in this way and the attachment piece 1a fixed to the side roof rail 5 is folded in half, and they are overlapped with each other on the vehicle interior R side of the folding part 11. A first folded portion A and a second folded portion B that are in a state are formed. The first folding part A is located on the vehicle interior R side, and the second folding part B is located between the first folding part A and the folding part 11.
[0017]
And in the 1st folding | turning part A and the 2nd folding | turning part B, as shown in FIG. 3, the length b of the 2nd folding | turning part B is formed longer than the length a of the 1st folding | turning part A. (A> b). For this reason, the upper portion of the second folded portion B is in a state of wrapping between the folded portion 11 and the side roof rail 5. Specifically, as shown in FIG. 4, the first folding part A is configured by an upper part of the gas introduction path 8, and the second folding part B includes a lower part of the gas introduction path 8, an inlet 7 a, The upper end portion of the expansion chamber 7 is configured.
[0018]
When a gas is injected from the inflator 9 at the time of a side collision or rollover of the vehicle, the gas first enters the gas introduction path 8 to expand the first folding part A and then expand the second folding part B. . As shown in FIG. 5, the first folding part A and the second folding part B expand to stretch between the head lining 6 and the side roof rail 5, so that the head lining 6 mainly includes the first folding part A. And it is pushed open to the vehicle interior R side by the second folding part B.
[0019]
Therefore, since the folding part 11 is pushed to the vehicle interior R side without being particularly strongly pressed against the headlining 6 side, the resistance when the folding part 11 is deployed is reduced, the deployment speed is improved, and the deployment direction is increased. Is also stable. And the passenger | crew's head can be reliably protected by the airbag developed toward the lower side in the form of a curtain.
[0020]
In addition, since the upper part of the second folded portion B wraps around between the folded portion 11 and the side roof rail 5, when that portion expands, a propulsive force directed toward the deployment direction is generated in the folded portion 11, The deployment speed of the airbag 1 is further improved.
[0021]
Further, since the second folded portion B includes the inlet 7a of the expansion chamber 7, the gas flows from the inlet 7a into the expansion chamber 7 after the second folded portion B is expanded, that is, the folded portion 11 is the first. Since it is after being pushed out into a wide space on the vehicle interior R side by the expansion of the folded-back portion B, the inlet 7a is sufficiently opened, and smooth gas introduction into the expansion chamber 7 can be performed.
[0022]
In addition, since the folding part 11 is in the form of an outer winding roll, the folding part 11 is unwound and unfolded while moving toward the side window (not shown) located below the side roof rail 5, Even when the vehicle rolls over such that the gap with the window (not shown) becomes narrow, the airbag 1 can be reliably inflated within the narrow gap to protect the passenger's head.
[0023]
In the above embodiment, the roll-shaped folding part 11 is taken as an example, but a bellows-like folding part may be used.
[Brief description of the drawings]
FIG. 1 is a side view showing a state in which an airbag according to an embodiment of the present invention is deployed in a curtain shape downward.
FIG. 2 is a cross-sectional view showing a state in which the airbag of FIG. 1 is folded and stored.
FIG. 3 is an enlarged cross-sectional view showing a folded state of the airbag of FIG. 2;
4 is a side view in front of an airbag showing a range of a first folded portion and a second folded portion in FIG. 1; FIG.
5 is a cross-sectional view showing a state in which the first folded part and the second folded part in FIG. 2 are expanded and the folded part is pushed out to the vehicle interior side.
[Explanation of symbols]
1 Airbag 1a Mounting piece (upper end)
5 Side roof rail (vehicle body)
6 Headlining (interior material)
7 Expansion chamber 7a Inlet 8 Gas introduction path 9 Inflator 11 Folding part A First folding part B Second folding part a First folding part length b Second folding part length R Car interior

Claims (2)

In the space between the upper part of the vehicle body on the vehicle interior side and the interior material, an airbag whose upper end is fixed to the vehicle body in the front-rear direction is stored in a roll-like or bellows-like folded part in the vertical direction, and the airbag is taken from the inflator An airbag device for a vehicle that expands in the form of a curtain toward the lower side while pushing and opening the interior material toward the vehicle interior,
A first folded portion that is folded twice between the upper end portion of the airbag and the folded portion, and is housed on the vehicle interior side of the folded portion, and a second that is accommodated between the first folded portion and the folded portion. And forming the folded part,
The second folded portion is formed longer than the first folded portion, and the upper portion of the second folded portion is wound between the folded portion and the vehicle body ,
The airbag has a structure having a plurality of expansion chambers arranged in the front-rear direction and a gas introduction path along the front-rear direction communicating with the inlet of the upper end of the expansion chamber, respectively.
The vehicular airbag apparatus , wherein the second folded portion includes at least an inlet of an expansion chamber . The airbag device for a vehicle according to claim 1 Symbol placement,
The vehicle airbag apparatus according to claim 1, wherein the folding portion is in the form of an outer winding roll that is rolled up from the lower end side to the vehicle compartment side wall to form a roll.

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