JP2002337646A - Air bag device for protecting head part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress bag damage in expanding and developing without degrading a housing property of an air bag. SOLUTION: The air bag device for protecting a head part protects a head part of an occupant by expanding and developing an air bag 11 in a curtain shape by gas supplied from an inflator to a gas supply port 11a provided on a gas passage 11b for connecting upper parts of an expansion part for a front seat and an expansion part for a rear seat of the air bag 11 housed in a folded state along a roof side rail. The gas supply port 11a is provided on an intermediate part of the gas passage 11b, a tip 13a of a diffuser pipe 13 for introducing the gas from the inflator to the gas passage 11b is faced to the gas passage 11b through the gas supply port 11a, and a closing wall 13a1 for closing a tip end and gas distributing holes 13a2, 13a3 to the expansion part for a front seat and the expansion part for a rear seat are formed on the tip 13a of the diffuser pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head protection airbag device mounted on a vehicle, and more particularly to an airbag stored in a folded state along a roof side rail in a curtain shape along a side wall of a vehicle compartment. The present invention relates to a head protection airbag device that is inflated and deployed to protect the head of an occupant.

[0002]

2. Description of the Related Art This type of head protection airbag device includes:
The airbag stored along the roof side rail in the folded state has a front seat inflation portion and a rear seat inflation portion, and has a gas passage communicating between the upper portions of the two inflation portions. A gas supply port provided in a gas passage is inflated and deployed in a curtain shape along a side wall of a vehicle cabin by a gas supplied from an inflator to protect an occupant's head. -301394
And JP-A-2000-127886.

In the head protection airbag device disclosed in each of the above publications, a tubular body is provided along the gas passage of the airbag to suppress bag damage due to gas supplied from the inflator to the airbag. I am trying to do it. Japanese Patent Application Laid-Open No. H11-321536 discloses an airbag in which an inner tube is provided along a gas passage of an airbag to suppress bag damage caused by gas supplied from the inflator to the airbag. I have.

[0004]

In each of the head protection airbag devices described above, the inner tube and the tubular body (protection member) described above are provided in the gas passage of the airbag.
Since the bag damage caused by the gas supplied from the inflator to the airbag is suppressed, the above-described inner tube or tubular body may inhibit the folding of the airbag and impair the storage of the airbag in the vehicle. In addition to the above, the cost of the airbag device is increased.

On the other hand, in the head protection airbag device, there are various requirements regarding the inflation and deployment performance of the airbag (requirement that the time from the start of inflation and deployment to the completion of inflation and deployment is equal to or less than a set time, It is necessary to satisfy a request to maintain the initial internal pressure until completion to be equal to or higher than the high set pressure, a request to maintain the internal pressure to be equal to or higher than the low set pressure within a predetermined time after the elapse of the initial predetermined time from the completion of expansion and deployment, and the like.

In order to shorten the time required for completing the inflation and deployment of the airbag and to increase the initial internal pressure, measures are generally taken to increase the gas supply capacity of the inflator. However, if the gas supply capacity of the inflator is increased, the bag damage is increased and the internal pressure holding time cannot be extended. For this purpose, it is necessary, for example, to sufficiently apply a coating for maintaining airtightness to the surface of the airbag to suppress bag damage and improve the airtight performance, or to improve the airtight performance of the airbag and then increase the gas supply capacity of the inflator. Therefore, improving the inflation and deployment performance of the airbag and reducing the cost are contradictory issues. Such a problem can be solved if bag damage of the airbag can be suppressed by means that can be realized at low cost.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an airbag housed along a roof side rail in a folded state, comprising an inflatable portion for a front seat and an inflatable portion for a rear seat. And a gas passage communicating the upper portions of the two inflatable portions.The gas is supplied from the inflator to a gas supply port provided in the gas passage so as to expand and deploy in a curtain shape along the side wall of the vehicle compartment. In a head protection airbag device designed to protect the head of an occupant, the gas supply port is provided at an intermediate portion of the gas passage, and a diffuser pipe for guiding gas supplied from the inflator to the gas passage. The front end of the diffuser pipe faces the gas passage through the gas supply port, and the front end of the diffuser pipe has a closing wall for closing the front end, the front seat expansion section and the rear seat expansion. Providing the gas distribution holes into the parts (the invention according to claim 1) is characterized.

In this case, it is possible to provide the gas distribution holes on the peripheral wall of the diffuser pipe (the invention according to claim 2). In this case, the gas distribution holes are provided on both the front and rear of the peripheral wall of the diffuser pipe. It is possible to provide the gas distribution hole at a location (the invention according to claim 3) and to make the direction of forming the gas distribution holes substantially horizontal (the invention according to claim 4). Further, it is possible to dispose the gas distribution hole in the gas passage (the invention according to claim 5). In this case, the distal end portion of the diffuser pipe including the gas distribution hole is located at the end of the airbag. It is possible to arrange within the folding width of the upper end (the invention according to claim 6).

In the present invention, the direction in which the gas distribution holes formed in the front and rear portions of the peripheral wall of the diffuser pipe are formed (gas injection direction) is obliquely downward.
In this case, the gas supply port is expanded toward the gas passage in accordance with the inclination angle of the gas distribution hole (the invention according to claim 8). Alternatively, it is possible to form the gas distribution hole substantially perpendicular to the inclined portion formed on the peripheral wall of the diffuser pipe (the invention according to claim 9).

Further, in the present invention, it is possible to provide the gas distribution holes provided at both front and rear portions of the peripheral wall of the diffuser pipe so as to be deflected by a predetermined angle toward the outside of the vehicle in a plan view of the vehicle (the invention according to claim 10). , In this case,
The direction in which the gas is ejected from the gas distribution hole can be directed to the position of the end of the gas passage in the front-rear direction (the invention according to claim 11). Further, the opening area of the gas distribution holes provided at both front and rear portions of the peripheral wall of the diffuser pipe is set according to the volumes of the front seat expansion portion and the rear seat expansion portion (the invention according to claim 12). It is possible.

Further, in the present invention, the distance between the closing wall of the gas distribution holes (formed in the gas passage in a substantially horizontal direction) formed at both front and rear portions of the peripheral wall of the diffuser pipe is set to be forward and rearward. (Invention according to claim 13), and the forming direction (tilt angle) of the gas distribution holes (formed diagonally downward) provided at both front and rear portions of the peripheral wall of the diffuser pipe.
Can be different between the front side and the rear side (the invention according to claim 14).

Further, in the present invention, a projecting portion is provided on the closed wall of the diffuser pipe having a gas distribution hole formed in the peripheral wall so as to protrude toward the outside of the pipe to form a concave portion which opens toward the inside of the diffuser pipe ( (Invention according to claim 15), or forming a concave portion that opens toward the outside of the diffuser pipe by providing a projecting portion that projects toward the inside of the pipe on the closed wall of the diffuser pipe provided with a gas distribution hole in the peripheral wall. (Invention according to claim 16) is possible, and in these cases, it is possible to displace the protruding portion in the front-rear direction and to provide the protrusion on the closing wall (invention according to claim 17).

Further, in the present invention, the gas distribution holes which are further opened inward in the vehicle width direction are provided on the peripheral wall of the diffuser pipe having the gas distribution holes at both front and rear portions.
8) is possible, and in this case, the distance between the gas distribution holes opening toward the inside in the vehicle width direction from the closed wall and the distance between the front and rear gas distribution holes from the closed wall is defined. The gas distribution holes that open inward in the vehicle width direction are different from the opening areas of the front and rear gas distribution holes (the invention according to claim 19). Or the formation direction of the gas distribution holes opening inward in the vehicle width direction with respect to the horizontal plane may be different from the formation direction of the front and rear gas distribution holes with respect to the horizontal plane (the invention according to claim 21). It is possible.
Further, a projecting portion projecting into the diffuser pipe is provided at a position located inside the diffuser pipe in the vehicle width direction, and a gas distribution hole opened toward the vehicle width direction inside is formed in a peripheral wall of the projecting portion. The invention according to Item 22) is possible.

In the present invention, when gas distribution holes are provided at both front and rear portions of the peripheral wall of the diffuser pipe, the gas supply port of the airbag is formed so as to expand toward the gas passage. The airbag may be provided with an auxiliary inflation chamber extending below in the vertical direction in communication with the gas passage at the upper end below the distal end of the diffuser pipe (the invention according to claim 24). Is possible.

Further, in the present invention, a gas distribution hole is provided at the tip of the diffuser pipe facing the gas passage through the gas supply port of the airbag so as to straddle the closing wall and the peripheral wall (the invention according to claim 25). ) Is possible. Further, the diffuser pipe facing the gas passage through the gas supply port of the airbag has a pipe body connected to the inflator, and has a closed wall and a gas distribution hole fitted and fixed to the outer periphery of the tip of the pipe body. It is possible to comprise at least two members of the pipe tip (the invention according to claim 26). In this case, a step formed by the pipe main body and the pipe tip is provided with the airbag of the airbag. It is possible to fix the gas supply port forming portion (the invention according to claim 27).

[0016]

In the head protection airbag device according to the present invention (the invention according to claim 1), the gas flow direction can be changed by colliding the gas with the closing wall of the diffuser pipe. The gas can be supplied in a desired direction to the gas passage of the airbag through the gas distribution hole of the diffuser pipe. For this reason, in the initial stage of the inflation and deployment of the airbag, the gas passage of the folded airbag is quickly expanded to increase the area receiving the gas pressure, and the effective passage area in the gas passage is sufficiently ensured.
Therefore, a part of the gas passage is not subjected to a large load due to the supply gas, so that bag damage at the portion can be suppressed, and the gas is directed toward the front seat inflation portion and the rear seat inflation portion of the airbag. Can be supplied promptly, and the deployment performance of the airbag can be improved.

In addition, at the tip of the diffuser pipe facing the gas passage through the gas supply port of the airbag, a closing wall for closing the tip, and a gas distribution hole to the front seat inflation portion and the rear seat inflation portion are provided. Since the device is provided to deal with bag damage, the device can be simplified, and the airbag can be easily folded small.
The storage property of the airbag in the vehicle can be improved, and the cost of the airbag can be reduced.

When the gas distribution hole is provided in the peripheral wall of the diffuser pipe (in the case of the invention according to claim 2), the gas distribution hole is formed from the closed wall (bottom wall) of the diffuser pipe. By appropriately setting the distance to the hole, the wall effect of the closed wall (bottom wall) (the effect of increasing the pressure at a portion close to the closed wall in the diffuser pipe) can be appropriately set, and the initial gas to the gas passage can be set. The flow can be controlled, and the adjustment of bag damage and deployment performance can be easily performed. Further, in the case where the gas distribution holes are provided at both front and rear portions of the peripheral wall of the diffuser pipe (in the case of the invention according to claim 3), the gas is preferably distributed and supplied to the front portion and the rear portion of the gas passage. Thus, the deployment performance of the airbag can be improved.

Further, when the direction of forming the gas distribution holes is substantially horizontal (in the case of the invention according to claim 4), the time required for the gas to reach the front part and the rear part of the gas passage can be shortened. Thus, it is possible to shorten the time required for completing the deployment of the airbag. In the case where the gas distribution holes are arranged in the gas passage (in the case of the invention according to claim 5), the time required for the gas to reach the front portion and the rear portion of the gas passage with bag damage suppressed. Can be shortened, and the deployment completion time of the airbag can be shortened. Further, when the distal end of the diffuser pipe including the gas distribution hole is disposed within the folding width at the uppermost end of the airbag (in the case of the invention according to claim 6), the airbag is stored (foldable). ), It is possible to both reduce bag damage and improve deployment performance.

Further, when the present invention is carried out, the direction of forming gas distribution holes (gas injection direction) provided on both front and rear portions of the peripheral wall of the diffuser pipe is obliquely downward (in the case of the invention according to claim 7). In the initial stage of the inflation and deployment of the airbag, gas can be supplied obliquely downward to the gas passage of the folded airbag, and the gas distribution holes are formed in a substantially horizontal direction. do it,
It is possible to enhance the deployability of the gas passage and to stabilize the behavior of the airbag during deployment.

Further, when the gas supply port is formed so as to expand toward the gas passage in accordance with the inclination angle of the gas distribution hole (in the case of the invention according to claim 8), the diffuser pipe is The amount of protrusion of the diffuser pipe tip into the gas passage can be reduced without obstructing the flow of gas from the gas distribution hole to the gas passage of the airbag, reducing damage to the airbag and improving deployment performance. The airbag can be easily stored (folded) while satisfying both requirements.

In the case where the gas distribution hole is formed substantially perpendicular to the inclined portion formed on the peripheral wall of the diffuser pipe (in the case of the ninth aspect), the gas distribution hole is formed on the peripheral wall of the diffuser pipe. By changing the inclination angle of the part,
The direction in which the gas is ejected from the gas distribution hole can be changed, and the deployability of the gas passage and the behavior during deployment of the airbag can be easily adjusted.

Further, when the present invention is carried out, the gas distribution holes provided at both front and rear portions of the peripheral wall of the diffuser pipe are provided so as to be deflected by a predetermined angle toward the outside of the vehicle in a plan view of the vehicle. In the case where the airbag is disposed in a V-shape, for example, in a plan view of the vehicle, and the front and rear ends of the airbag are displaced outwardly of the vehicle, the airbag is disposed through the gas distribution hole of the diffuser pipe. It is possible to satisfactorily flow the gas toward the front and rear ends of the gas passage in the airbag, and it is possible to shorten the time until the deployment of the airbag is completed. Further, in the case where the direction in which the gas is ejected from the gas distribution hole is directed to the arrangement position of the front and rear ends of the gas passage (in the case of the invention according to claim 11).
The gas can be linearly flowed from the gas distribution hole of the diffuser pipe toward the front and rear ends of the gas passage in the airbag, and the time until the deployment of the airbag can be reduced. .

In the case where the opening areas of the gas distribution holes provided at the front and rear portions of the peripheral wall of the diffuser pipe are set in accordance with the volumes of the front seat expansion portion and the rear seat expansion portion. In the case of the invention), the inflatable portion for the front seat and the inflatable portion for the rear seat of the airbag can be almost simultaneously inflated and deployed, so that the deployment behavior of the airbag can be stabilized and the deployment of the airbag is completed. The time until the time can be shortened.

In practicing the present invention, the distance of the gas distribution holes (formed in the gas passage in a substantially horizontal direction) provided at the front and rear portions of the peripheral wall of the diffuser pipe from the closed wall is adjusted to the front. (In the case of the invention according to the thirteenth aspect), or the direction of formation (inclination angle) of gas distribution holes (formed diagonally downward) provided at both front and rear portions of the peripheral wall of the diffuser pipe Is different between the front and rear (in the case of the invention according to claim 14), the flow of gas from the front gas distribution hole and the flow of gas from the rear gas distribution hole can be made different. Thus, the deployment performance (for example, deployment behavior) of the airbag can be adjusted.

Further, when the present invention is carried out, a projecting portion is provided on the closing wall of the diffuser pipe having a gas distribution hole formed on the peripheral wall so as to project toward the outside of the pipe to form a concave portion opening toward the inside of the diffuser pipe. In the case (in the case of the invention according to claim 15), the wall effect and the gas flow due to the obstruction wall in the diffuser pipe can be changed by the concave portion, and the gas distribution hole of the diffuser pipe passes through the gas passage of the airbag. The gas flow to the air can be changed (slowed). For this reason, without changing the gas distribution holes,
By changing the shape of the recess, it is possible to adjust the deployment performance of the airbag.

[0027] Further, in the case where a projecting portion projecting toward the inside of the diffuser pipe is provided on the closing wall of the diffuser pipe having a gas distribution hole formed in the peripheral wall to form a concave portion opening outside the diffuser pipe. In the case of the invention according to
The wall effect of the obstruction wall in the diffuser pipe and the gas flow can be changed by the protrusion, and the gas flow from the gas distribution hole of the diffuser pipe to the gas passage of the airbag can be changed (speeded up). Can be. Therefore, it is possible to adjust the deployment performance of the airbag by changing the shape of the protruding portion without changing the gas distribution hole.

Further, when the projecting portion is provided on the closing wall so as to be deviated in the front-rear direction (in the case of the invention according to claim 17), compared with the case where the projecting portion is provided at the center of the closing wall. Therefore, it is possible to change the gas distribution ratio before and after the gas passage in the airbag (for example, when the protruding portion is displaced forward, the gas supply amount forward is increased). It is possible to adjust the deployment performance of the airbag without changing the holes.

Further, when the present invention is carried out, a gas distribution hole which is further opened inward in the vehicle width direction is provided on the peripheral wall of the diffuser pipe having gas distribution holes at both front and rear portions. In the case of the invention), at the initial stage of inflation and deployment of the airbag, the airbag can be deployed even inward in the vehicle width direction. Therefore, it is possible to prevent the airbag from being caught on the upper end of the B-pillar garnish by setting the position of the distal end of the diffuser pipe corresponding to, for example, the B-pillar garnish.

Further, when the distance between the gas distribution holes opening inward in the vehicle width direction and the closing wall is different from the distance between the front and rear gas distribution holes and the closing wall. In the case of the invention, or when the opening area of the gas distribution hole opening inward in the vehicle width direction is different from the opening area of the front and rear gas distribution holes (the case of the invention according to claim 20). The gas flow supplied to the airbag from the gas distribution holes that open inward in the vehicle width direction can be different from the gas flow supplied to the airbag from the front and rear gas distribution holes. Can be adjusted.

In the case where the direction of formation of the gas distribution holes opening inward in the vehicle width direction with respect to the horizontal plane is different from the direction of formation of the front and rear gas distribution holes with respect to the horizontal plane (the invention according to claim 21). ), The flow direction of the gas supplied to the airbag from the gas distribution holes opening inward in the vehicle width direction is different from the flow direction of the gas supplied to the airbag from the front and rear gas distribution holes. It is possible to adjust the deployment behavior of the airbag.

Further, a projecting portion projecting into the pipe is provided at a portion located inside the diffuser pipe in the vehicle width direction, and a gas distribution hole opened toward the vehicle width direction inside is formed in a peripheral wall of the projecting portion. In this case (in the case of the invention according to claim 22), the opening direction (gas injection direction) of the gas distribution hole that opens inward in the vehicle width direction can be easily changed by changing the shape of the protrusion provided on the diffuser pipe. It can be changed, and can be easily changed according to the vehicle type (body shape).

In implementing the present invention, in the case where gas distribution holes are provided at both front and rear portions of the peripheral wall of the diffuser pipe, the gas supply port of the airbag is formed so as to expand toward the gas passage. In the case of the invention according to claim 23), even if the gas distribution hole of the diffuser pipe and the gas supply port of the airbag are temporarily overlapped with each other, the gas can smoothly flow from the gas distribution hole to the gas supply port, The damage of the airbag can be reduced. In the case where an auxiliary inflation chamber communicating with the gas passage at the upper end and extending vertically is provided in the airbag below the distal end of the diffuser pipe (in the case of the invention according to claim 24), the air may be blown. Gas also flows into the auxiliary inflation chamber of the bag, which promotes downward deployment of the airbag. Therefore, the time until the deployment of the airbag is completed can be shortened.

When the present invention is implemented, a gas distribution hole is provided at the end of the diffuser pipe facing the gas passage through the gas supply port of the airbag so as to straddle the closing wall and the peripheral wall. In the case of the invention according to
By diagonally cutting off the tip of the diffuser pipe, the gas distribution hole can be easily formed, the diffuser pipe can be easily manufactured, and the cost of the diffuser pipe can be reduced.

In implementing the present invention, the diffuser pipe facing the gas passage through the gas supply port of the airbag is fitted and fixed to the pipe body connected to the inflator and to the outer periphery of the distal end of the pipe body. In the case where the gas distribution hole is formed by at least two members of the pipe end portion having the closed wall and the gas distribution hole (in the case of the invention according to claim 26), the gas distribution hole is easily formed in the pipe end portion by using a general-purpose machine. Can be processed. Further, when a gas supply port forming portion of the airbag is fixed to a step formed by the pipe main body and the pipe tip (in the case of the invention according to claim 27), the step is effectively used. By utilizing this, the airbag and the diffuser pipe can be fixed, and the fixing strength between the airbag and the diffuser pipe can be easily increased.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 to 8 show an embodiment in which the present invention is applied to a head protection airbag device for a passenger car vehicle. The airbag device of this embodiment is inflated and deployed in a curtain shape along a side wall of a vehicle compartment. Airbag 11
And an airbag module 10 composed of a tension cloth 12 attached to the front end of the airbag 11 and an inflator 14 airtightly attached to a gas supply port 11a of the airbag 11 via a diffuser pipe 13. Have.

The airbag 11 is formed by a weave so that the weave direction is front and rear and up and down. The airbag 11 is provided with a coating for maintaining airtightness on its surface. 11a, a gas passage 11b extending in the front-rear direction substantially perpendicular to a lower end of the gas passage 11b, a front seat inflation portion 11c and a rear seat inflation portion 11d communicating through the gas passage 11b.
e, a front end non-expandable portion 11f and four attachment pieces 11g. Note that each mounting piece 11g is provided with a mounting hole 11g1 for the roof side rail 21.

The gas passage 11b is provided above the airbag 11, and is set so as to be substantially horizontal in a side view when the airbag 11 is mounted on the vehicle body. The gas passage 11b has a front end 11b1 extending above the front end of the front seat inflatable portion 11c and a rear end 11b2 extending above the rear end of the rear seat inflatable portion 11d. The upper portions of the portions 11c and 11d are communicated with each other, and a gas supply port 11a is provided at an intermediate portion thereof (an upper portion of the intermediate non-expandable portion 11e).

As shown in FIG. 1 and FIG. 2, the front seat inflatable portion 11c is used to move the head Hf of the occupant Mf who is seated on the front seat 51 (seat provided corresponding to the B pillar 23). For protection, four expansion chambers (cells) 11c4, 11c5 are formed inside the center by three T-shaped partitions (non-expansion portions) 11c1, 11c2, and 11c3 provided at the center in the vertical direction.
The expansion chambers 11c4 to 11c7 communicate with each other at upper and lower ends.

As shown in FIG. 1 and FIG. 2, the rear seat inflatable portion 11d is a head Hr of the occupant Mr sitting on the rear seat 52.
The interior of the center is divided into three expansion chambers (cells) 11d3, 11d4, and 11 by two T-shaped partitions (non-expansion portions) 11d1 and 11d2 provided at the center in the vertical direction.
d5, each of these expansion chambers 11d3 to 11d
d5 communicates with each other at both upper and lower ends.

The tension cloth 12 is used for the airbag 11.
Is formed in a triangular shape (the shape can be changed as appropriate) with a non-coated woven fabric which is thinner and cheaper than the component fabric of
2a sewn to the front end non-inflated portion 11f of the airbag 11, and the mounting hole 12b1 provided in the front end 12b
It is configured to be assembled to the pillar 22 (see FIG. 1).

As shown in FIGS. 1 to 4 and 7, the diffuser pipe 13 is formed in a thin and substantially J-shape, and has a flare on a male screw portion 14 b provided in a gas injection port 14 a of the inflator 14. The airbag 11 is hermetically attached to the gas supply port 11a of the airbag 11 using a tightening band 15, while being connected and fixed in an airtight and integral manner using the nut 13b.

Further, as shown in FIG. 1, the tip of the diffuser pipe 13 is slightly behind the B-pillar 23, and extends along the door glass (side glass) surface 41 as shown in FIG. The airbag 11 is disposed so as to face obliquely downward (substantially parallel to the door glass surface 41), and supplies gas to the gas passage 11 b of the airbag 11 from above.

As shown in FIGS. 2 and 3, the diffuser pipe 13 has a distal end 13a projecting a predetermined amount into the gas passage 11b through the gas supply port 11a of the airbag 11. In addition, diffuser pipe 1
A closing wall (bottom wall) for closing the front end is provided at the front end portion 13a.
13a1 and a pair of front and rear gas distribution holes 13a having a vertically long rectangular shape.
2, 13a3 are provided.

Each of the gas distribution holes 13a2 and 13a3 is
As shown in FIG. 6 to FIG. 6, the diffuser pipe 13 is formed at each of the front and rear portions of the peripheral wall of the diffuser pipe 13, and its forming direction (gas injection direction) is substantially horizontal. The entire gas distribution holes 13a2 and 13a3 are arranged in the gas passage 11b of the airbag 11, and the opening areas thereof are substantially equal to each other. In addition, each gas distribution hole 13
The formation positions of a2 and 13a3 are the closed wall (bottom wall) 13a1.
It is above the predetermined amount Lo and is set so that a predetermined amount of wall effect by the closed wall (bottom wall) 13a1 is obtained.

The wall effect by the closing wall (bottom wall) 13a1 is an effect of increasing the pressure of a portion near the closing wall in the diffuser pipe 13, and reducing the above-mentioned predetermined amount Lo, that is, each gas distribution hole 13a2. By making the formation position of 13a3 closer to the closing wall (bottom wall) 13a1, the gas injection pressure from each of the gas distribution holes 13a2 and 13a3 can be increased, and each of the gas distribution holes 13a2 and 13a can be increased.
The gas flow from 3 to the gas passage 11b of the airbag 11 can be increased.

The inflator 14 is for injecting and supplying gas toward the airbag 11 at the time of a side collision or rollover of the vehicle, and as shown in FIG. Are assembled using bolts 16 and the like. Also, the inflator 14
Are arranged in the front-rear direction along the roof side rail 21 above the airbag 11 at the center in the front-rear direction of the vehicle, and are covered by a roof head lining 31.

The bracket 14c shown in FIG. 7 is a bracket (EA bracket) made of a material (energy absorbing material) which can be easily plastically deformed by an external force, and has a stroke until it comes into contact with the roof side rail 21. D can absorb energy. When the amount of energy is large, it is also possible to mount an energy absorbing pad 39 on the back surface of the roof head lining 31, as indicated by a virtual line.

In the airbag apparatus of this embodiment configured as described above, the airbag 11 and the tension cloth 12 are normally folded multiple times in the up-down direction and can be broken at normal times (FIGS. 7 and 8). A) and the A-pillar 22 and the roof side rail 2
1 and is covered by an A-pillar garnish (not shown) and a roof head lining 31.

FIG. 8 shows a cross section at the B-pillar garnish 33, and a projection 33a on the upper back surface of the B-pillar garnish 33 for preventing the inflating and deploying airbag 11 from entering the back of the B-pillar garnish 33. Are formed. Note that the projection 33a may be implemented as a shape shown by a virtual line in FIG. 8 (a shape having an inclined surface in a portion bent upward). In this case, the inflation and deployment of the airbag 11 is performed on the inclined surface. To prevent the airbag 11 from being caught on the upper end of the B pillar garnish 33.

In the event of a side collision or rollover of the vehicle, gas is blown out of the inflator 14, and this gas is passed through the diffuser pipe 13 to each gas distribution hole 1.
3a2, 13a3 to the gas passage 11b of the airbag 11
When the airbag 11 is supplied to the vehicle, the airbag 11 deforms the corresponding portion of the roof head lining 31 toward the passenger compartment and expands downward, and the tension cloth 12 deforms the corresponding portion of the A pillar garnish toward the passenger compartment. As shown in FIG. 1, the airbag 11 is inflated and deployed in a curtain shape along the side wall in the vehicle interior. At this time, the inflatable portions 11c and 11d of the airbag 11 are inflated and deployed toward the head protection areas located on the sides of the heads Hf and Hr of the occupants Mf and Mr.

In this embodiment, the distal end 13a of the diffuser pipe 13 has a closed wall (bottom wall) 13a.
a1 and a pair of front and rear gas distribution holes 13a2 and 13a3. In such a configuration, the gas flow direction can be changed by colliding the gas with the closing wall 13a1 of the diffuser pipe 13, and the gas flow direction of the gas passage 11b in the airbag 11 can be changed through the gas distribution holes 13a2 and 13a3 of the diffuser pipe 13. Each end 11b1,1
Gas can be supplied in a substantially horizontal direction toward 1b2.

Therefore, at the initial stage of inflation and deployment of the airbag 11, the gas passage 11 of the folded airbag 11
b expands quickly and the area receiving the gas pressure increases, and the effective passage area in the gas passage 11b is sufficiently ensured. Therefore, a part of the gas passage 11b is not subjected to a large load by the supply gas, so that the bag can be prevented from being damaged at the portion, and the front inflatable portion 11c and the rear inflatable portion 11d of the airbag 11 can be suppressed. , The gas can be supplied promptly, and the deployment performance of the airbag 11 can be improved.

The gas supply port 11a of the airbag 11
Diffuser pipe 1 facing gas passage 11b
3 is provided with a closing wall 13a1 for closing the tip.
In addition, gas distribution holes 13a2 and 13a3 are provided to the front-seat inflatable portion 11c and the rear-seat inflatable portion 11d to prevent bag damage, so that the device can be simplified. In addition, the airbag 11 can be easily folded into a small size, so that the airbag 11 can be easily stored in a vehicle and the cost of the airbag 11 can be reduced.

In this embodiment, since both gas distribution holes 13a2 and 13a3 are provided on the peripheral wall of the diffuser pipe 13, the distance from the closed wall 13a1 of the diffuser pipe 13 to both gas distribution holes 13a2 and 13a3 (see FIG. 6). By appropriately setting the predetermined amount Lo), the wall effect of the closing wall 13a1 can be appropriately set.
The gas flow is strengthened by reducing the predetermined amount Lo of
Alternatively, by increasing the predetermined amount Lo in FIG. 6, the gas flow can be weakened, the initial gas flow to the gas passage 11b can be controlled, and adjustment of bag damage and deployment performance can be easily performed. Further, each gas distribution hole 13a2, 1
Since 3a3 is provided at both front and rear portions of the peripheral wall of the diffuser pipe 13, gas can be distributed and supplied to the front portion and the rear portion of the gas passage 11b in a favorable manner, and the deployment performance of the airbag 11 can be improved.

Since the gas distribution holes 13a2 and 13a3 are formed in a substantially horizontal direction, the time required for the gas to reach the front and rear portions of the gas passage 11b can be shortened. Can be shortened. In addition, since the gas distribution holes 13a2 and 13a3 are arranged in the gas passage 11b, it is possible to shorten the time required for the gas to reach the front part and the rear part of the gas passage 11 in a state in which bag damage is suppressed. Can be shortened.

In the above embodiment, the airbag 11
However, it is also possible to employ a sewing bag or an adhesive (heat welding) bag. In the above embodiment, each gas distribution hole 13a2,
Although the whole 13a3 is arranged in the gas passage 11b, as shown in FIG. 9, a part (or all) of each gas distribution hole 13a2, 13a3 is arranged in the gas supply port 11a, and each gas distribution hole 13a2, The gas supply port 11a of the airbag 11 in the opening direction of the opening 13a3 may be formed so as to expand toward the gas passage 11b. In this case, each gas distribution hole 13a2,1 of the diffuser pipe 13
Although the gas supply port 11a of the airbag 11 overlaps the gas supply port 3a3, the gas can smoothly flow from the gas distribution holes 13a2 and 13a3 to the gas supply port 11a, and the damage to the airbag 11 can be reduced. it can.

In the above embodiment, the distal end 13a of the diffuser pipe 13 is made to protrude by a predetermined amount into the gas passage 11b of the airbag 11, but as shown in FIG. The distal end portion 13a of the diffuser pipe 13 projecting a predetermined amount is
1 may be arranged within the folding width W at the uppermost end. In this case, it is possible to achieve both reduction of bag damage and improvement of deployment performance without impairing the storage property (foldability) of the airbag 11.

In the above embodiment, the gas distribution holes 13a2, 13a3 in the diffuser pipe 13 are provided.
Is formed at each of the front and rear portions of the peripheral wall, but as illustrated in FIG. 11, the airbag 11 is disposed in a V shape in a plan view of the vehicle, and the front and rear ends of the airbag 11 are directed outward. In other words, when the front end portion 13a of the diffuser pipe 13 and the front and rear ends 11b1 and 11b2 of the gas passage 11b are substantially linear in a plan view of the vehicle, Gas distribution hole 13a
2, 13a3 can be formed by deflecting the formation position by a predetermined angle toward the outside of the vehicle in a plan view of the vehicle.

In this case, it is possible to satisfactorily flow gas from the gas distribution holes 13a2 and 13a3 of the diffuser pipe 13 to the front and rear ends 11b1 and 11b2 of the gas passage 11b in the airbag 11. It is possible to reduce the time required to complete the deployment of the eleventh embodiment. In this case, each gas distribution hole 13a2,
13a3 is formed in the gas passage 11
b, the gas distribution holes 13a of the diffuser pipe 13 are directed to the positions where the front and rear ends 11b1 and 11b2 are disposed.
2, 13a3 to the gas passage 11 in the airbag 11
The gas can be linearly flowed toward the front and rear ends 11b1 and 11b2 of b, and the time until the deployment of the airbag 11 is completed can be shortened.

In the above embodiment, the gas distribution holes 13a2 and 13a3 in the diffuser pipe 13 are provided.
Although the formation direction of the gas distribution holes 13a2 and 13a3 is substantially horizontal, the formation directions of the gas distribution holes 13a2 and 13a3 can be diagonally downward (both at a predetermined inclination angle θo) as illustrated in FIG. In this case, in the initial stage of the inflation and deployment of the airbag 11, gas can be supplied obliquely downward to the gas passage 11b of the folded airbag 11, and the gas distribution holes 13a2, 13a3 are formed in the same direction. Of the gas passage 11b can be improved as compared with the case where
It is possible to stabilize the behavior during deployment.

Further, as illustrated in FIG. 13, the formation direction of each of the gas distribution holes 13a2 and 13a3 is set to be obliquely downward, and the formation inclination angle θ of each of the gas distribution holes 13a2 and 13a3 is set.
It is also possible to implement the shape in which the gas supply port 11a is expanded toward the gas passage 11b in accordance with the angle o. In this case, each gas distribution hole 13a of the diffuser pipe 13
2 and 13a3, without impeding the flow of gas from the airbag 11 to the gas passage 11b.
The protrusion amount of the front end portion 13a into the gas passage 11b can be reduced (or eliminated), so that both the damage reduction of the airbag 11 and the improvement of the deployment performance can be achieved while the storage property (foldability) of the airbag 11 is improved. ) Can be increased.

As shown in FIG. 14, when the gas distribution holes 13a2 and 13a3 are formed obliquely downward, the gas distribution holes 13a2 and 13a3 are formed on the peripheral wall of the diffuser pipe 13 with an inclined portion 13a4. , 13a
It is also possible to carry out by forming it substantially orthogonal to 5. In this case, by changing the inclination angles of the inclined portions 13a4 and 13a5 formed on the peripheral wall of the diffuser pipe 13,
The direction in which the gas is ejected from each of the gas distribution holes 13a2 and 13a3 can be changed, so that the deployability of the gas passage 11b and the behavior of the airbag 11 during deployment can be easily adjusted.

In the above embodiment, as shown in FIG. 6, the opening areas of the gas distribution holes 13a2 and 13a3 provided in the diffuser pipe 13 are set to be substantially the same So, but as shown in FIG. And each gas distribution hole 13
The opening areas Sf, Sr of a2, 13a3 are
(Specifically, Sf> Sr) according to the volumes of the front seat expansion portion 11c and the rear seat expansion portion 11d. In this case, the front-seat inflatable portion 11c and the rear-seat inflatable portion 11d of the airbag 11 can be inflated and deployed almost simultaneously, and the deployment behavior of the airbag 11 can be stabilized. Can be shortened until the completion of deployment.

In the above embodiment, as shown in FIG. 6, the distance between the gas distribution holes 13a2 and 13a3 provided in the diffuser pipe 13 and the closing wall 13a1 is both set to a predetermined amount Lo. As illustrated in FIG. 16, the closing wall 13a1 of each gas distribution hole 13a2, 13a3
It is also possible to implement the distances from as different predetermined values Lf and Lr. In the case where the embodiment illustrated in FIG. 12 (the direction in which the gas distribution holes are formed obliquely downward) is employed, the diffuser pipe 13 is provided at both front and rear portions of the peripheral wall of the diffuser pipe 13 as illustrated in FIG. The gas distribution holes 13a2 and 13a3 may be formed with different directions (inclination angles) of predetermined values θf and θr for the front and the rear. In these cases, the gas flow from the front gas distribution hole 13a2 and the gas flow from the rear gas distribution hole 13a3
The flow of gas from the airbag can be made different, and the deployment performance (for example, deployment behavior) of the airbag can be adjusted.

In the above-described embodiment and each of the modified embodiments, the closing wall 13a1 of the diffuser pipe 13 is made flat. However, as shown in FIG. 18, the closing wall 13a1 of the diffuser pipe 13 faces the outside of the pipe. The diffuser pipe 1 is provided with a protruding portion 13a6
It is also possible to form a concave portion 13a7 opening toward the inside of the device 3 and carry out the process. In this case, the diffuser pipe 1
The wall effect and the gas flow by the closed wall 13a1 (the bottom wall including the protruding portion 13a6 protruding toward the outside of the pipe) in the inside 3 can be changed by the concave portion 13a7, and the gas distribution holes 13a2 of the diffuser pipe 13 can be changed. The gas flow from 13a3 to the gas passage 11b of the airbag 11 can be changed (slowed). Therefore, the gas distribution hole 1
By changing the shape of the recess 13a7 without changing the shape of the recesses 13a7, the airbag 1
1 can be adjusted.

As shown in FIG. 19, a projection 13a6 is provided on the closing wall 13a1 of the diffuser pipe 13 so as to project toward the inside of the pipe, thereby forming a concave portion 13a7 opening outside the diffuser pipe 13. It is also possible to carry out. In this case, the wall effect and the gas flow due to the closed wall 13a1 (the bottom wall including the protruding portion 13a6 protruding into the pipe) in the diffuser pipe 13 can be changed by the protruding portion 13a6, and the diffuser can be changed. The flow of gas from the gas distribution holes 13a2 and 13a3 of the pipe 13 to the gas passage 11b of the airbag 11 can be changed (increased). Therefore, the gas distribution holes 13
The deployment performance of the airbag 11 can be adjusted by changing the shape of the protrusion 13a6 without changing a2 and 13a3.

The embodiment illustrated in FIG. 19 (or FIG. 1)
In the case of carrying out by adopting the configuration exemplified in FIG.
As illustrated in FIG. 20, it is also possible to dispose the protrusion 13a6 in the front-rear direction and provide the protrusion 13a6 on the closing wall 13a1. In this case, the protrusion 13a6 is
The gas distribution ratio between the front and rear of the gas passage 11b in the airbag 11 is changed as compared with the case where it is provided at the center of a1 (specifically, by displacing the protrusion 13a6 forward, The amount of gas flowing out of the hole 13a2 can be increased), and the gas distribution holes 13a2, 1
It is possible to adjust the deployment performance of the airbag 11 without changing 3a3.

Further, in the above-described embodiment and each of the modified embodiments, the gas distribution holes 13a2 and 13a3 are provided at both front and rear portions of the peripheral wall of the diffuser pipe 13, but as shown in FIGS. It is also possible to provide a gas distribution hole 13a8 that opens further inward in the vehicle width direction (inside the cabin) on the peripheral wall of the diffuser pipe 13. In this case, at the initial stage of inflation and deployment of the airbag 11, the airbag 11 can be deployed even inward in the vehicle width direction. Therefore, by setting the disposition position of the distal end portion 13a of the diffuser pipe 13 to, for example, the B pillar garnish 33 shown in FIG. 8, it is possible to prevent the airbag 11 from being caught on the upper end of the B pillar garnish 33. is there.

In the case where the embodiment shown in FIGS. 21 and 22 is employed, the gas distribution holes 13a opened inward in the vehicle width direction as shown in FIG.
8 from the closing wall 13a1 to the distance Lo from the closing wall 13a1 of the front and rear gas distribution holes 13a2, 13a3.
(Or Lf, Lr), and as illustrated in FIG. 24, the opening area Si of the gas distribution hole 13a8 that opens inward in the vehicle width direction is
Open area So of front and rear gas distribution holes 13a2, 13a3
(Or Sf, Sr) and (gas distribution holes 13a8
Of the gas distribution holes 13a2 and 13a3). In these cases, the gas flow supplied to the airbag 11 from the gas distribution holes 13a8 opening inward in the vehicle width direction is the gas flow supplied to the airbag 11 from the front and rear gas distribution holes 13a2 and 13a3. Can be different,
The deployment behavior of the airbag 11 can be adjusted.

Also, instead of adopting the form illustrated in FIGS. 21 and 22, as shown in FIGS. 25 and 26, gas distribution holes 13a opening inward in the vehicle width direction are provided.
The formation direction (inclination angle θi) of the front and rear gas distribution holes 8a and 8a may be different from the formation direction (inclination angles θf and θr) of the front and rear gas distribution holes 13a2 and 13a3 with respect to the horizontal plane. In this case, the flow direction of the gas supplied to the airbag 11 from the gas distribution holes 13a8 opening inward in the vehicle width direction is changed to the front and rear gas distribution holes 13a2, 13a.
3 can be different from the flow direction of the gas supplied to the airbag 11, and the deployment behavior of the airbag 11 can be adjusted.

In the case where the embodiment shown in FIGS. 25 and 26 is adopted and implemented,
As illustrated in (b) and (c), a protruding portion 13a9 that protrudes into the diffuser pipe 13 is provided at a position located inside the diffuser pipe 13 in the vehicle width direction. It is also possible to form a gas distribution hole 13a8 which is opened by opening. In this case, by changing the shape of the protruding portion 13a9 provided on the diffuser pipe 13, the opening direction (gas injection direction) of the gas distribution hole 13a8 opening inward in the vehicle width direction can be easily changed, For example, it can be easily changed according to the vehicle type (body shape).

In practicing the present invention, as illustrated in FIG.
It is also possible to provide the airbag 11 with an auxiliary inflation chamber 11h, which communicates at the upper end with the gas passage 11b of the airbag 11 and extends vertically. In this case, the gas also flows into the auxiliary inflation chamber 11h of the airbag 11, and the downward deployment of the airbag 11 is promoted. Therefore, the time until the deployment of the airbag 11 is completed can be shortened.

In practicing the present invention, as illustrated in FIG. 29, the gas distribution holes 13a2 and 13a3 are provided at the end of the diffuser pipe 13 so as to straddle the closed wall and the peripheral wall.
It is also possible to provide and implement. In this case, the gas distribution holes 13a2 and 13a3 can be easily formed by cutting off the tip of the diffuser pipe 13 obliquely, the diffuser pipe 13 can be easily manufactured, and the low cost of the diffuser pipe 13 can be reduced. Can be achieved.

In practicing the present invention, as illustrated in FIG. 30, the diffuser pipe 13 is connected to the pipe body 13B connected to the inflator 14 and the outer periphery of the tip of the pipe body 13B by, for example, screwing (or screwing). It is also possible to implement by implementing at least two members of a pipe 13A fitted and fixed by caulking, welding, etc. and having a closed wall 13a1 and gas distribution holes 13a2, 13a3. In this case, the gas distribution hole 1 is provided at the pipe tip 13A.
3a2 and 13a3 can be easily processed using a general-purpose machine. In addition, as illustrated in FIG. 30, when the gas supply port 11a forming portion of the airbag 11 is fixed to the step portion 13C formed by the pipe body portion 13B and the pipe tip portion 13A using the tightening band 15. Is the step 13
By effectively using C, the airbag 11 and the diffuser pipe 13 can be fixed, and the fixing strength between the airbag 11 and the diffuser pipe 13 can be easily increased.

Further, the respective configurations employed in the respective embodiments shown in FIGS. 9 to 30 can also be employed in appropriate combinations, and when the respective configurations described above are employed in appropriate combinations. Therefore, the effects of the respective components can be obtained synergistically, and fine adjustment can be easily performed when the airbag module 10 is manufactured.

In the above embodiment, as shown in FIG. 1, the tip of the diffuser pipe 13 is
3, the diffuser pipe 13 can be arranged as appropriate, and the diffuser pipe 13 may be arranged so that the tip of the diffuser pipe 13 overlaps the B pillar 23. It is possible. Further, in the above-described embodiment, the present invention is applied to the head protection airbag device for a vehicle of a passenger car type. It is.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a head protection airbag device (attached to the right side of a vehicle) according to the present invention.

FIG. 2 is an enlarged side view of the airbag module shown in FIG.

FIG. 3 is an enlarged vertical sectional side view showing a relationship between a distal end portion of the diffuser pipe shown in FIG. 2 and an airbag.

FIG. 4 is a side view of the diffuser pipe and the inflator shown in FIG. 2;

FIG. 5 is an enlarged perspective view of a distal end portion of the diffuser pipe shown in FIG.

FIG. 6 is an enlarged longitudinal sectional view of a distal end portion of the diffuser pipe shown in FIG.

FIG. 7 is an enlarged longitudinal rear view of the airbag shown in FIGS. 1 and 2 in a state in which the airbag is folded and stored in a rearward direction from an inflator.

FIG. 8 is an enlarged vertical rear view of the airbag shown in FIGS. 1 and 2 when the airbag is folded and stored in a B pillar portion.

FIG. 9 is a longitudinal sectional side view of an embodiment in which a part of a gas distribution hole of a diffuser pipe is arranged in a gas supply port of an airbag.

FIG. 10 is a vertical sectional side view showing a relationship between a distal end portion of the diffuser pipe and an uppermost folding width of the airbag.

FIG. 11 is a cross-sectional plan view of an embodiment in which the gas distribution holes of the diffuser pipe are provided so as to be deflected by a predetermined angle toward the outside of the vehicle in a plan view of the vehicle.

FIG. 12 is a longitudinal sectional side view of an embodiment in which a gas distribution hole of a diffuser pipe is formed to be inclined obliquely downward.

13 is a vertical sectional side view showing a relationship between the diffuser pipe and the airbag shown in FIG.

FIG. 14 is a longitudinal sectional side view of an embodiment in which a gas distribution hole is formed in an inclined portion provided on a peripheral wall of a diffuser pipe.

FIG. 15 is a longitudinal sectional side view of an embodiment in which opening areas of gas distribution holes before and after provided in a diffuser pipe are different.

FIG. 16 is a longitudinal sectional side view of an embodiment in which the distance between the front and rear gas distribution holes provided in the diffuser pipe from the closing wall is different.

FIG. 17 is a longitudinal side view of an embodiment in which the directions (inclination angles) of the front and rear gas distribution holes provided in the diffuser pipe are different.

FIG. 18 is a longitudinal sectional side view of an embodiment in which a protrusion protruding outside the pipe is provided on a closing wall of the diffuser pipe.

FIG. 19 is a longitudinal sectional side view of an embodiment in which a protrusion protruding into the pipe is provided on a closed wall of the diffuser pipe.

20 is a longitudinal sectional side view of an embodiment in which the protrusion shown in FIG. 19 is provided so as to be deflected forward.

FIG. 21 is a perspective view of an embodiment in which a gas distribution hole that opens further inward in the vehicle width direction is provided in a substantially horizontal direction on the peripheral wall of the diffuser pipe.

FIG. 22 is a longitudinal sectional side view of an embodiment in which a gas distribution hole that opens further inward in the vehicle width direction is provided substantially in the horizontal direction on the peripheral wall of the diffuser pipe.

FIG. 23 is a longitudinal sectional front view of an embodiment in which the distance between the front and rear gas distribution holes provided in the diffuser pipe from the closing wall and the distance from the closing wall of the gas distribution hole opening inward in the vehicle width direction are different. It is.

FIG. 24 is a longitudinal sectional front view of an embodiment in which the opening areas of gas distribution holes before and after provided in the diffuser pipe and the opening area of gas distribution holes opening inward in the vehicle width direction are different.

FIG. 25 is a vertical cross-sectional side view of an embodiment in which a gas distribution hole that opens further inward in the vehicle width direction is formed in the peripheral wall of the diffuser pipe so as to be inclined obliquely downward.

FIG. 26 is a longitudinal sectional front view of an embodiment in which a gas distribution hole that opens further inward in the vehicle width direction is formed in the peripheral wall of the diffuser pipe so as to be inclined obliquely downward.

FIG. 27 is a longitudinal sectional front view of an embodiment in which a projecting portion projecting into the pipe is provided at a portion located inside the diffuser pipe in the vehicle width direction, and a gas distribution hole opening inward in the vehicle width direction is formed in the projecting portion. FIG.

FIG. 28 is a side view corresponding to FIG. 2 of an embodiment in which an auxiliary inflation chamber is provided at the lower end of the diffuser pipe, which communicates with the gas passage of the airbag at the upper end and extends in the up-down direction.

FIG. 29 is a perspective view of an embodiment in which a gas distribution hole is provided so as to straddle a closed wall and a peripheral wall of a diffuser pipe.

FIG. 30 is a longitudinal sectional side view of an embodiment in which the diffuser pipe is constituted by a pipe main body and a pipe tip.

[Explanation of symbols]

10 ... airbag module, 11 ... airbag, 11
a: gas supply port, 11b: gas passage, 11c: front seat inflatable portion, 11d: rear seat inflatable portion, 11e: middle non-inflatable portion,
11f: front end non-expandable portion, 11g: mounting piece portion, 11h: auxiliary expansion chamber, 12: tension cross, 13: diffuser pipe, 13a: distal end portion, 13a1: closing wall, 13a
2, 13a3 ... front and rear gas distribution holes, 13a4, 13a5
... Incline, 13a6 ... Projection provided on the closing wall, 13a7
... recess, 13a8 ... gas distribution hole on the inner side in the vehicle width direction, 13a
9: Projection provided on peripheral wall, 14: Inflator, 21 ...
Roof side rail, 22: A pillar, 23: B pillar, 31: Roof head lining, 33: B pillar garnish, 41: Door glass surface.

Claims (27)

[Claims] An airbag stored along a roof side rail in a folded state has a front seat inflation portion and a rear seat inflation portion, and a gas passage communicating between upper portions of the two inflation portions. A head protection air that expands and deploys in a curtain shape along the side wall of the vehicle cabin with a gas supplied from an inflator to a gas supply port provided in the gas passage to protect the occupant's head. In the bag device, the gas supply port is provided at an intermediate portion of the gas passage, and a distal end of a diffuser pipe that guides gas supplied from the inflator to the gas passage faces the gas passage through the gas supply port, The front end portion of the diffuser pipe is provided with a closing wall for closing the front end, and a gas distribution hole for the front seat inflating portion and the rear seat inflating portion. Abag device. 2. The head protection airbag device according to claim 1, wherein the gas distribution hole is provided in a peripheral wall of the diffuser pipe. 3. The head protection airbag device according to claim 1, wherein the gas distribution holes are provided at both front and rear portions of a peripheral wall of the diffuser pipe. 4. The head protection airbag device according to claim 3, wherein the gas distribution holes are formed in a substantially horizontal direction. 5. The head protection airbag device according to claim 4, wherein the gas distribution hole is disposed in the gas passage. 6. The head protection airbag device according to claim 5, wherein a tip portion of the diffuser pipe including the gas distribution hole is arranged within a folding width of an uppermost end of the airbag. Head protection airbag device. 7. The head protection airbag device according to claim 3, wherein the gas distribution holes are formed obliquely downward. 8. The head protection airbag device according to claim 7, wherein the gas supply port is formed to expand toward the gas passage in accordance with the inclination angle of the gas distribution hole. Head protection airbag device. 9. The head protection airbag device according to claim 7, wherein the gas distribution hole is formed substantially perpendicular to an inclined portion formed in a peripheral wall of the diffuser pipe. Bag device. 10. The head protection airbag device according to claim 3, wherein the gas distribution hole is provided so as to be deflected by a predetermined angle toward the outside of the vehicle in a plan view of the vehicle. 11. The head protection airbag device according to claim 10, wherein a direction in which the gas is ejected from the gas distribution hole is directed to a position at which a front-rear end of the gas passage is disposed. Head protection airbag device. 12. The head protection airbag device according to claim 3, wherein the opening areas of the front and rear gas distribution holes are set according to the volumes of the front seat inflatable portion and the rear seat inflatable portion. A head protection airbag device characterized by the above-mentioned. 13. The head protection airbag device according to claim 5, wherein the distance between the front and rear gas distribution holes from the closing wall is different between the front and the rear. Bag device. 14. The head protection airbag device according to claim 7, wherein the gas distribution holes are formed in different directions at the front and rear sides. 15. The head protection airbag device according to claim 2, wherein a projection is provided on the closing wall of the diffuser pipe so as to project toward the outside of the pipe, and the recess is opened toward the inside of the diffuser pipe. A head protection airbag device characterized by forming: 16. The head protection airbag device according to claim 2, wherein a projection projecting toward the inside of the diffuser pipe is provided on the closing wall of the diffuser pipe, and the recess opens toward the outside of the diffuser pipe. A head protection airbag device characterized by forming: 17. The head protection airbag device according to claim 15, wherein the protruding portion is displaced in the front-rear direction and provided on the closing wall. . 18. The head protection airbag device according to claim 3, wherein a gas distribution hole that opens further inward in the vehicle width direction is provided in a peripheral wall of the diffuser pipe. Bag device. 19. The head protection airbag device according to claim 18, wherein the distance between the gas distribution hole that opens inward in the vehicle width direction from the closing wall and the front and rear gas distribution holes is closed. An airbag device for protecting a head, which is different from a distance from a wall. 20. The head protection airbag device according to claim 18, wherein an opening area of the gas distribution hole opening inward in the vehicle width direction is different from an opening area of the front and rear gas distribution holes. A head protection airbag device characterized by the above-mentioned. 21. The head protection airbag device according to claim 18, wherein the forming direction of the gas distribution holes opening inward in the vehicle width direction with respect to the horizontal plane is the forming direction of the front and rear gas distribution holes with respect to the horizontal plane. A head protection airbag device characterized by being different from the above. 22. The head protection airbag device according to claim 18, wherein a projecting portion projecting into the diffuser pipe is provided at a position located inside the diffuser pipe in the vehicle width direction,
A head protection airbag device, wherein a gas distribution hole that opens inward in the vehicle width direction is formed in the peripheral wall of the protruding portion. 23. The head protection airbag device according to claim 3, wherein the gas supply port is formed so as to expand toward the gas passage. 24. The head protection airbag device according to claim 3, wherein the lower end of the diffuser pipe has
A head protection airbag device, wherein an auxiliary inflation chamber communicating with the gas passage at an upper end and extending vertically is provided in the airbag. 25. The head protection airbag device according to claim 1, wherein the gas distribution hole is provided so as to straddle the closed wall and the peripheral wall of the diffuser pipe. Bag device. 26. The head protection airbag device according to claim 1, wherein the diffuser pipe is fitted and fixed to a pipe main body connected to the inflator and an outer periphery of a distal end of the pipe main body, and the closed end is provided. A head protection airbag device comprising at least two members, a wall and a pipe tip having the gas distribution hole. 27. The head protection airbag device according to claim 26, wherein a gas supply port forming portion of the airbag is fixed to a step formed by the pipe main body and the pipe tip. Characteristic head protection airbag device.