JP3399320B2 - Airbag device for passenger seat - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a passenger airbag device for protecting a passenger in a vehicle such as an automobile.

[0002]

2. Description of the Related Art As a conventional airbag device for a passenger seat of this type, one having a structure as described in, for example, Japanese Patent Laid-Open No. 5-262195 is known.

In this conventional device, an airbag is accommodated in a folded state in a case. Further, an inner bag for controlling the flow of gas is arranged in the airbag, and a plurality of exhaust ports are formed at upper and lower and left and right positions of a body portion of the inner bag. Then, when the inflator is operated, the inner bag is inflated and deployed, and gas is supplied into the airbag from these exhaust ports to deploy the airbag.

[0004]

However, in this conventional passenger seat airbag device, the plurality of exhaust ports are formed at positions facing the gas ejection ports of the inflator. Therefore, the gas from the inflator begins to flow into the airbag through the exhaust port before it sufficiently stays in the inner bag. Therefore, even though the inner bag is arranged in the airbag, it is not possible to effectively reduce the deployment speed of the airbag to the occupant side, the airbag is not sufficiently expanded, and the case remains in the folded state. There is a problem that the function of protecting the occupant is not sufficient because it may be projected to the outside.

Further, in this conventional device, the width of the inner bag is formed to be substantially the same as the width of the case. For this reason, as described above, the airbag is forcibly deployed in the width direction when the inner bag is inflated and deployed, in combination with the fact that the plurality of exhaust ports are arranged opposite to the gas ejection ports of the inflator. However, this configuration also has a problem that the effect of reducing the deployment speed of the airbag is low.

The present invention has been made by paying attention to the problems existing in such conventional techniques. It is an object of the invention to provide an airbag device for a passenger seat, which can reduce the deployment speed of an airbag to the occupant side.

[0007]

In order to achieve the above object, the invention according to claim 1 is provided with an inner bag, in which gas is ejected from the gas ejection port of the inflator, inside the airbag. In the passenger airbag device,
Before the gas port paired countercurrent portion of the inner bag
In addition to forming a tubular closing portion extending in the longitudinal direction of the inflator, forming side walls at both ends of the closing portion ,
Block the edge of the side wall by joining it to the inside of the airbag.
Exhaust port that opens laterally between both ends of the section and the side wall
The gist is that the gas is supplied to the inside of the airbag through the exhaust port .

[0008]

[0009]

[0010]

According to this structure, the gas ejected from the inflator is once retained in the inner bag, then flows out from the exhaust ports on both sides in the vehicle width direction, and is supplied into the airbag. Therefore, the deployment speed of the airbag toward the occupant is reduced, and the airbag is prevented from protruding outside the case in the folded state.

[0012]

[0013] In the invention described in claim 2 is the airbag device for a passenger seat according to claim 1, the distal edges of the side walls, joined to the air bag in the inside of the junction to the air bag of the closed portion This is the gist.

According to this structure, the gas ejected from the inflator expands the inner bag in the shape of a parachute, so that the gas is reliably retained in the inner bag. In the invention described in claim 3, in a passenger airbag apparatus provided with an inner bag in the air bag gas is ejected into the interior of the gas port of the inflator, the gas injection port of the inner bag and pairs said in part that direction
A tubular closed portion extending in the longitudinal direction of the inflator is formed, and exhaust ports that open laterally are formed at both ends of the closed portion so that gas is supplied into the airbag through the exhaust ports. And the width of the inner bag is set to be larger than the width of the airbag in the inner bag portion.

According to this structure, the airbag is forcibly deployed in the vehicle width direction as the inner bag is inflated and deployed while the inflator is operating. Therefore, the deployment speed of the airbag to the occupant side is surely reduced.

According to a fourth aspect of the present invention, in the passenger airbag apparatus according to the third aspect , the width of the inner bag is set to be substantially the same as the maximum width of the airbag. The summary will be given.

According to this structure, when the inflator is actuated, the expansion amount of the airbag, which is forcedly expanded in the vehicle width direction due to the inflation and expansion of the inner bag, increases in the vehicle width direction, and the occupant side of the airbag. The deploying speed to is more reliably reduced.

According to a fifth aspect of the present invention, in the airbag apparatus for a passenger seat according to the third or fourth aspect , the airbag is formed into a substantially quadrangular pyramid shape that widens toward the occupant side. However, the gist is that the width of the inner bag is set to be larger than the width of the corresponding position in the deployed state of the airbag.

According to this structure, the deployment speed of the airbag to the occupant can be surely reduced without increasing the capacity of the airbag. Claim 6
In the invention according to claim 8, in the airbag apparatus for a passenger seat according to claim 8, in the inner bag, one base cloth is folded back at a central portion, and an opening portion at both end portions and an inflator mounting portion at the base end are excluded. The gist of the invention is that the both side edges are joined to form a substantially T-shape.

According to this structure, the joint portion of the base cloth can be reduced on the inner bag, and the joint portion can be eliminated at the portion where the gas pressure is most applied. Therefore, the pressure resistance of the inner bag is improved. It Moreover, since the cut shape of the base fabric of the inner bag can be simplified and the number of joints can be reduced, the inner bag can be easily and inexpensively manufactured.

According to a seventh aspect of the invention, in the passenger airbag apparatus according to the ninth aspect, both side portions of the central folded portion of the inner bag are joined from the folded portion side leaving an opening. This is the gist.

According to this structure, the gas stagnation can be formed in the inner bag with a simple structure.
The gas ejected from the inflator can be retained in the inner bag, and the deployment speed of the airbag can be effectively reduced.

According to the eighth aspect of the invention, in the airbag apparatus for a passenger seat, the airbag is provided with an inner bag for controlling the flow of gas, and is disposed on the upper surface of the instrument panel facing the windshield. The inner bag is formed in the shape of a bag having a side wall, and the exhaust port is formed only on the surface of the inner bag facing the windshield .
That it has to be fed subjected to the air bag gas through the exhaust port as its gist.

According to this structure, all the gas ejected from the inflator is once retained in the inner bag, then flows out from the exhaust port toward the windshield and is supplied into the airbag. Therefore, the airbag is stably deployed along the windshield, and the deployment speed of the airbag toward the occupant is reduced. Further, the outflow speed of the gas from the discharge port is reduced, the impact load on the windshield is also reduced, and the occupant protection performance is improved.

[0025]

DETAILED DESCRIPTION OF THE INVENTION

(First Embodiment) A first embodiment of the present invention will be described below with reference to FIGS.

As shown in FIGS. 1 to 3, the passenger seat airbag apparatus 21 of this embodiment is fixedly arranged on an upper portion of an instrument panel 23 facing a windshield 22 in a vehicle such as an automobile. Reference numeral 23a denotes a skin of the instrument panel 23, and 34 denotes a cover that covers the passenger airbag device 21. Airbag device 21
The case 24 is formed in a substantially box shape with an upper surface opened, and a plurality of insertion holes 25 are formed in the bottom of the case 24. A cylindrical inflator 26 for injecting gas is arranged in the case 24, and a plurality of screws 27 are provided on the outer surface of the inflator 26 in a protruding manner. Then, these screws 27 are inserted into the insertion holes 25 of the case 24, and nuts 28 are attached to the respective screws 27.
The inflator 26 is attached to the case 24 by screwing
It is fixed inside. The inflator 26 has a gas generating agent (not shown) housed in an inflator case 26a, the gas generating agent is thermally decomposed at the time of collision, and the decomposed gas is ejected from a gas ejection port 26b of the inflator case 26a. The gas outlet 26b is provided in the inflator case 26.
It is formed in the upper center of a.

As opposed to the inflator 26,
An airbag 29 is stored in the case 24 in a predetermined folded state. The airbag 29 is formed so as to have a substantially quadrangular pyramid shape that widens toward the occupant side, and a plurality of insertion holes 30 are formed in a mounting portion 29a at the base end thereof. An inner bag 31 for controlling the flow of gas is arranged in the airbag 29. The inner bag 31 has a body portion 31c as a substantially cylindrical closed portion extending in the vehicle width direction along the opening surface of the case 24, and the body portion 3 thereof.
1c and side walls 31a closing both ends thereof, and a plurality of insertion holes 32 are formed in the attachment portion 31b extending from the body portion 31c.
Are formed. And the body part 31c is the said jet 2
6b is arranged at a position to close 6b at intervals. Also,
A small exhaust port 33 that opens laterally is formed in the center of each side wall 31a, and gas is supplied into the airbag 29 through the exhaust port 33.

Then, as shown in FIGS. 3 and 4, when fixing the inflator 26 to the case 24, the screw 27 on the inflator 26 is inserted into the insertion holes 30 and 32 of the airbag 29 and the inner bag 31. As a result, the attachment portions 29a and 31b of the airbag 29 and the inner bag 31 are attached.
Are sandwiched and fixed between the inflator 26 and the case 24.

Next, the operation of the passenger seat airbag apparatus constructed as described above will be described. In the passenger seat airbag apparatus, when gas is ejected from the ejection port 26a of the inflator 26 due to a collision of the vehicle, the gas is supplied into the inner bag 31 and is temporarily retained therein. As a result, first, a small capacity inner bag 31
The inner pressure of is increased, the inner bag 31 is inflated and deployed, and the door 34 that covers the opening surface of the case 24 is opened.

After that, the gas in the inner bag 31 flows out in the vehicle width direction through the exhaust ports 33 of the both side walls 31a and is supplied into the outer airbag 29. Thereby, as shown in FIGS. 3 and 4, the airbag 29 is deployed toward the left and right sides and the occupant side. At that time, a small exhaust port 33 that opens laterally is formed only on both side walls 31a of the inner bag 31, and a portion facing the ejection port 26a is closed by the body portion 31c. The gas from 26a is once retained in the inner bag as described above, the outflow into the airbag 29 is regulated, and the airbag 29 is deployed at a slow speed. For this reason, the case 2 with the airbag 29 in the folded state is kept.
4 The occupant protection function is improved without the possibility of being projected outside.

The effects that can be expected from the first embodiment will be described below. In this embodiment, the portion of the inner bag 31 facing the gas ejection port 26b is closed, and the exhaust ports 33 are formed only on both sides, and gas is supplied into the airbag 29 via the exhaust ports 33. It is supposed to be done. Therefore, the gas ejected from the inflator 26 once stays in the inner bag 31, and then the exhaust ports 33 on both sides.
Is flown out in the vehicle width direction and is supplied into the airbag 29. Therefore, the deployment speed of the airbag 29 toward the occupant can be reduced, and the occupant protection function can be improved.

In this embodiment, the exhaust ports 33 are formed only on both sides of the inner bag 31. Therefore, by changing the size of the exhaust port 33 of the inner bag 31 without changing the gas ejection performance from the inflator 26, the gas supply speed into the airbag 29 can be changed. The deployment speed of the airbag 29 can be easily adjusted.

In this embodiment, the exhaust port 33
Is formed in the central portion of the both side walls 31a, so that when gas is supplied into the inner bag 31, the body portion 31c can largely swell. Therefore, the gas can be effectively retained in the inner bag 31.

In this embodiment, when the inflator 26 is operated, the inner bag 31 having a small capacity is first inflated and expanded, and the internal pressure thereof is increased. Therefore, the cover 34 that covers the opening surface of the case 24 can be easily opened.

(Second Embodiment) Next, the second embodiment of the present invention will be described.
The embodiment will be described with reference to FIGS. In addition,
In each of the following embodiments, configurations that are the same as or similar to those in the first embodiment are given the same reference numerals in the drawings, and detailed description thereof is omitted.

In the second embodiment, the airbag 29 is formed in substantially the same manner as in the first embodiment, but the structure of the inner bag 31 is different from that of the first embodiment. That is, in this embodiment, as shown in FIG. 7, the trapezoidal side wall portion 3 is formed in the center of the left and right ends of the body portion 38 forming the closed portion of the base cloth 37 of the inner bag 31.
9 is projected, and both side edges of the body portion 38 are projected obliquely. That is, the inner bag 31 is composed of one base cloth 37.

Then, as shown in FIGS. 8 and 9, with the base cloth 37 of the inner bag 31 inserted in the airbag 29, the upper and lower joint portions 38a of the body portion 38 are sewn with seams 40.
Is sewn to the attachment portion 29a of the airbag 29. In addition, the tip edges 39a of the side wall portions 39 are not
Is sewn to the airbag 29 at a seam 41 at a portion inside a line L1 connecting both ends of the upper and lower joint portions 38a. As a result, on both sides of the inner bag 31, an opening 42 as an exhaust port is formed laterally between both side edges of the side wall portion 39 and both ends of the body portion 38.

Therefore, when gas is generated from the inflator 26, the gas is supplied into the inner bag 31 and once retained therein, and the inner bag 31 is inflated and deployed in a substantially parachute shape. Then, the gas in the inner bag 31 is divided into upper and lower parts in the vehicle width direction from the openings 42 on both sides to flow out, and is supplied into the airbag 29. As a result, the airbag 29 is deployed toward both left and right sides and the occupant side.

At this time, the inner bag 31 is inflated and deployed in a substantially parachute shape, and the gas flows out vertically through the openings 42 on both sides thereof in the vehicle width direction. Is sufficiently regulated, and the deployment speed of the airbag 29 is effectively reduced.

Therefore, in the second embodiment, in addition to the effects substantially similar to those of the first embodiment described above, the following unique effects can be exhibited. -In this embodiment, the tip edge 39a of the side wall portion 39 formed in the center of the left and right ends of the inner bag 31 is projected.
However, the inner bag 31 is joined to the airbag 29 at a portion inside a line L1 connecting both ends of the upper and lower joining portions 38a to the airbag 29. For this reason,
The gas ejected from the inflator 26 causes the inner bag 31 to inflate like a parachute. Therefore, the gas is once retained in the inner bag 31, then divided into upper and lower parts in the vehicle width direction from the openings 42 on both sides, and is supplied into the airbag 29. Therefore, the deployment speed of the airbag 29 to the occupant side can be effectively reduced, and the occupant protection performance can be effectively exhibited.

In this embodiment, since the inner bag 31 is composed of one base cloth 37,
The manufacturing of the inner bag 31 can be facilitated. (Third Embodiment) Next, a third embodiment of the present invention will be described with reference to FIGS.

In the third embodiment, the airbag 29 is formed in the shape of a substantially quadrangular pyramid that widens toward the occupant, as in the first embodiment.
1 is different from that of the first embodiment. That is,
In the inner bag 31 of this embodiment, as shown in FIG. 11, one piece of base cloth 45 is folded back at the central portion, and openings 46 as exhaust ports at both ends and an inflator mounting portion 4 at the base end are provided.
Both side edges except 7 are sewn together by seams 48 to form a substantially planar T-shape. For this reason,
Body part 3 as a closing part at the folded-back part of the inner bag 31
1c is formed, and the openings 46 are formed at both ends thereof so as to face sideways. Further, in the inflator mounting portion 47 of the inner bag 31, as in the first embodiment,
A plurality of insertion holes 49 for inserting the screws 27 on the inflator 26 are formed.

Then, as shown in FIG. 10, when the inner bag 31 is inflated and deployed while being assembled in the case 24, the inner bag 31 is arranged in a cylindrical shape extending in the vehicle width direction along the opening surface of the case 24. It is supposed to be done. Further, the width dimension W1 of the body portion 31c in the inflated and deployed state of the inner bag 31 is larger than the width dimension W2 of the opening surface of the case 24, and the maximum width dimension W3 of the airbag 29.
It is set to be about the same as the above, and is larger than the width dimension W4 of the corresponding position in the deployed state of the airbag 29.

Therefore, when gas is generated from the inflator 26, the gas is supplied into the inner bag 31 and once retained therein, so that the inner bag 31 extends in a tubular shape in the vehicle width direction. Inflated and deployed. At this time, the width W1 of the inner bag 31 is set to be larger than the width W2 of the case 24 and is set to be approximately the same as the maximum width W3 of the airbag 29, so that the inner tubular member 31 has a long tubular shape. With the expansion of the bag 31,
First, the airbag 29 is forcibly deployed in the vehicle width direction. That is, as shown by the solid line in FIG. 10, the normal airbag 29 is formed so as to be expanded in the shape of a wide quadrangular pyramid toward the occupant side as shown by the dashed line in FIG. , Forcibly extended in the vehicle width direction.

After that, the gas in the inner bag 31 flows out from the openings 46 on both sides in the vehicle width direction and is supplied into the airbag 29. As a result, the airbag 29 is deployed toward the occupant. Thus, the airbag 29 is first forcedly deployed in the vehicle width direction and then deployed to the occupant side, so that the deployment speed of the airbag 29 to the occupant side is effectively reduced. Moreover, when the gas in the inner bag 31 is supplied into the airbag 29, both ends of the inner bag 31 near the opening 46 press the inner wall of the corresponding airbag 29. Therefore, the amount of gas flowing out of the openings 46 into the airbag 29 is regulated, and the deployment speed of the airbag 29 is suitably reduced.

By the way, in the conventional airbag device, as shown in FIG. 12, the width W of the inner bag 31 is reduced.
1 is set to be substantially the same as the width dimension W2 of the case 24 and smaller than the width dimension W4 and the maximum width dimension W3 of the corresponding position in the deployed state of the airbag 29. Therefore, when the inner bag 31 is inflated and deployed, the airbag 29 is not forcibly deployed in the vehicle width direction, and the effect of reducing the deployment speed of the airbag 29 cannot be fully expected.

Therefore, in this third embodiment,
In addition to the effects similar to those of the first embodiment described above, the following unique effects can be exhibited. In this embodiment, the inner bag 31 is formed in a tubular shape extending in the vehicle width direction along the opening surface of the case 24 so that the width dimension W1 of the inner bag 31 is larger than the width dimension W2 of the case 24. It is set. Therefore, when the inflator 26 is activated, the airbag 29 is forcibly deployed in the vehicle width direction as the tubular inner bag 31 is inflated and deployed. Therefore, the deployment speed of the airbag 29 toward the occupant can be surely reduced.

In this embodiment, the width W1 of the inner bag 31 is the maximum width W3 of the airbag 29.
It is set to be about the same as. Therefore, the airbag 29 can be forcibly deployed in the vehicle width direction by the inflation deployment of the long tubular inner bag 31.
The deployment speed of the airbag 29 toward the occupant can be reduced more reliably.

In this embodiment, when the gas in the inner bag 31 is supplied into the airbag 29,
Both ends of the inner bag 31 near the opening 46 are
Since the inner wall of the corresponding airbag 29 is pressed, the amount of gas flowing into the airbag 29 from both openings 46 is regulated. Therefore, the deployment speed of the airbag 29 can be reduced more preferably.

In this embodiment, the airbag 29 is formed in a substantially quadrangular pyramid shape that widens toward the occupant side. The width W1 of the inner bag 31 is set to be larger than the width W4 of the corresponding position of the airbag 29 in the expanded state. Therefore, without increasing the capacity of the airbag 29,
It is possible to reliably reduce the deployment speed of the vehicle to the passenger side.

In this embodiment, the inner bag 31 has one base cloth 45 folded back at the center, and both side edges except the openings 46 at both ends and the inflator mounting portion 47 at the base end are sewn or the like. By joining, it is formed in a substantially T shape. Therefore, the joint portion of the base cloth 45 on the inner bag 31 can be reduced, and the joint portion can be eliminated at the portion where the gas pressure is most applied, and the pressure resistance of the inner bag 31 can be improved. . Further, the cutting shape of the base cloth 45 of the inner bag 31 can be simplified, and the number of joints can be reduced, so that the inner bag 31 can be manufactured easily and inexpensively.

(Fourth Embodiment) Next, the fourth embodiment of the present invention will be described.
The embodiment will be described with reference to FIGS. 13 and 14.
Now, in the fourth embodiment, the structure of the inner bag 31 is different from that of the first embodiment. That is, the inner bag 31 of this embodiment has a substantially triangular side wall 3.
It is formed in a bag shape having 1a. When the inner bag 31 is inflated and expanded by the gas from the inflator 26, as shown in FIG. 14, the windshield 22, the upper surface of the instrument panel 23, and the occupant side edge of the instrument panel 23 are separated from each other. Vertical plane F1 to pass
It is arranged in the space formed by and. Further, in this embodiment, the plurality of exhaust ports 33 are provided only on the surface of the inner bag 31 facing the windshield 22.
Are formed.

Therefore, when gas is generated from the inflator 26, the gas is supplied into the inner bag 31, is temporarily retained therein, and the inner bag 31 is inflated and expanded. After that, the gas in the inner bag 31 flows out from the exhaust port 33 toward the windshield 22 and is supplied into the airbag 29. As a result, the airbag 29 is deployed upward along the windshield 22 and is deployed at a slow speed toward the occupant side.

Therefore, in the fourth embodiment,
In addition to the effects similar to those of the first embodiment described above, the following unique effects can be exhibited. -In this embodiment, the inner bag 31 is formed in the shape of a bag having the side wall 31a. An exhaust port 33 is formed on the surface of the inner bag 31 facing the windshield 22, and the airbag 2 is opened through the exhaust port 33.
Gas is supplied to the inside of the container 9. For this reason,
The gas ejected from the inflator 26 is temporarily retained in the inner bag 31, then flows out from the exhaust port 33 toward the windshield 22, and is supplied into the airbag 29. Therefore, the airbag 29 can be stably deployed along the windshield 22, and the deployment speed of the airbag 29 toward the occupant can be reduced. Further, since the outflow speed of the gas from the discharge port 33 can be reduced, the impact load on the windshield 22 can be reduced, and the occupant protection performance can be improved.

In this embodiment, as shown in FIG. 14, the airbag 29 is deployed in a state of contacting the windshield 22. That is, since there is no space for the airbag 29 to escape in the vehicle front direction of the airbag 29, the load from the occupant can be immediately supported by the windshield 22 when the occupant is restrained by the airbag 29, and Good passenger protection performance can be obtained.

(Other Embodiments) Next, the structure of the inner bag 31 different from the first to fourth embodiments will be described with reference to FIGS. 15 and 16.

The configuration shown in FIG. 15 is a modification of the second embodiment. In this structure, the base cloth 37 of the inner bag 31 is formed in a substantially octagonal shape by the body portion 38 and the trapezoidal side wall portions 39 protruding from the entire left and right end edges thereof. Then, as in the case of the second embodiment, with the base cloth 37 of the inner bag 31 inserted into the airbag 29, the upper and lower joint portions 38a of the body portion 38 are attached with the seams 40 at the airbag 29. Part 29
sewn on a. Further, the leading edge 39 of the side wall portion 39
a is a portion inside the line L1 connecting both ends of the upper and lower joint portions 38a of the body portion 38, and the airbag 2 at the seam 41.
It is designed to be sewn on 9.

Therefore, when gas is generated from the inflator 26, the gas is supplied into the inner bag 31 and once retained therein, so that the inner bag 31 is different from the case of the second embodiment described above. Is expanded into a large parachute. And this inner bag 31
The gas inside is divided into upper and lower parts in the vehicle width direction from the openings 42 on both sides and flows out, and is supplied into the airbag 29. Therefore, also in this configuration, the deployment speed of the airbag 29 to the occupant side can be effectively reduced, as in the second embodiment.

The configuration shown in FIG. 16 is a modification of the third embodiment. In this configuration, the inner bag 31 has the body portion 31 at the folded-back portion, as in the third embodiment.
By folding back one piece of the base cloth 45 at the central portion so that c is formed, and stitching both side edges except the openings 46 as exhaust ports at both ends and the inflator mounting portion 47 at the base end with the seams 48. , And is substantially T-shaped in plan view. Further, in this embodiment, both sides of the central folded portion of the inner bag 31 are sewn together at the seam 52, leaving the opening 46 from the folded portion side.

Therefore, when the inner bag 31 is inflated and expanded, a stagnation of gas is formed inside the seams 52 on both sides, and the outflow of gas from the opening 46 into the airbag 29 is restricted. Therefore, as compared with the configuration of the third embodiment described above, the deployment speed of the airbag 29 toward the occupant can be further reduced.

It should be noted that this embodiment can be modified and embodied as follows, and even in the case of such a configuration, substantially the same effect as that of the above-described embodiment can be exhibited.

In the first embodiment, the side shape of the inner bag 31 is changed to another shape such as a triangle. -In the third embodiment, the width dimension of the inner bag 31 is formed to be larger than the maximum width of the airbag 29. Alternatively, the width dimension of the inner bag 31 should be larger than the width dimension W4 of the corresponding position of the inner bag 31 in the normal deployed state of the airbag 29 shown in FIG. 10 and smaller than the maximum width dimension W3 of the airbag 29. .

In the fourth embodiment, the side shape of the inner bag 31 is changed to another shape such as a circle. In the fourth embodiment, the number and size of the exhaust ports 33 are changed to adjust the deployment speed of the airbag 29.

The seams 40, 4 in the second embodiment, the third embodiment, the configuration of FIG. 15 and the configuration of FIG.
Instead of sewing with 1, 48, 52, the predetermined joining portions of the base fabrics 37, 45 are joined and fixed with an adhesive or the like. Alternatively, in the first and fourth embodiments,
The inner bag 31 may be joined and fixed by sewing or adhering to the airbag 29.

In each embodiment, the airbag 29
Also, the inner bag 31 is configured to be attached to another portion such as the opening edge of the case 24. -In 1st-3rd embodiment, the mounting position of the airbag apparatus 21 with respect to a vehicle is changed to the occupant side end part of the instrument panel 23.

[0066]

Since the present invention is constructed as described above, it has the following effects. According to the configuration described in claim 1, the gas ejected from the inflator is once retained in the inner bag, then flows out from the exhaust ports on both sides in the vehicle width direction, and is supplied into the airbag. Therefore, the deployment speed of the airbag to the occupant side can be reduced, and the airbag can be prevented from protruding outside the case and being in contact with the occupant in the folded state.

Further, according to the present invention, by changing the size of the exhaust ports formed on both sides of the inner bag, the amount of gas supplied into the airbag can be changed, and the airbag is expanded. The speed can be adjusted easily. Further, when the inflator operates, the inner pressure of the small-capacity inner bag first becomes high, so that the door covering the opening surface of the case can be easily opened.

[0068]

Further, according to the invention of claim 1, it is possible to configure the inner bag at a single base fabric, it is possible to facilitate the manufacture of the inner bag. Claim 2
According to the invention described in (1), the gas ejected from the inflator causes the inner bag to inflate in a parachute shape, so that the gas can be reliably retained in the inner bag, and the deployment speed of the airbag to the occupant side is further improved. It can be surely reduced.

According to the third aspect of the invention, the airbag can be forcibly deployed in the vehicle width direction as the inner bag is inflated and deployed when the inflator is actuated.
It is possible to reliably reduce the deployment speed of the airbag to the occupant side.

According to the fourth aspect of the present invention, when the inflator is actuated, the deployment amount in the vehicle width direction of the airbag which is forcedly deployed in the vehicle width direction by the inflation deployment of the inner bag is increased. Therefore, the deployment speed of the airbag to the occupant side can be reduced more reliably.

According to the fifth aspect of the present invention, the deployment speed of the airbag toward the occupant can be reliably reduced without increasing the capacity of the airbag. According to the invention described in claim 6 , the joint portion of the base cloth can be reduced on the inner bag, and the joint portion can be eliminated in the portion where the gas pressure is most applied. Therefore, the pressure resistance of the inner bag can be improved. Can be improved. Moreover, since the cutting shape of the base fabric of the inner bag can be simplified and the number of joints can be reduced, the inner bag can be easily and inexpensively manufactured.

According to the invention described in claim 7 , since the gas stagnation can be formed in the inner bag with a simple structure, the gas ejected from the inflator can be retained in the inner bag. The deployment speed of the airbag can be effectively reduced.

According to the invention described in claim 8 , after all the gas ejected from the inflator is once retained in the inner bag, it is flown out from the exhaust port toward the windshield into the air bag. Supplied. For this reason,
The airbag can be stably deployed along the windshield, and the deployment speed of the airbag to the occupant can be reduced. Further, since the outflow rate of the gas from the discharge port can be reduced, the impact load on the windshield can be reduced, and the occupant protection performance can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a passenger seat airbag device according to a first embodiment.

FIG. 2 is an enlarged perspective view showing an inner bag of the airbag device.

FIG. 3 is a vertical cross-sectional view of the airbag device.

FIG. 4 is a cross-sectional view of the airbag device.

FIG. 5 is a perspective view of a passenger seat airbag device according to a second embodiment.

FIG. 6 is an enlarged perspective view showing an inner bag of the airbag device.

FIG. 7 is a plan view showing a base fabric of the inner bag.

FIG. 8 is a cross-sectional view showing a state in which the inner bag is sewn into the airbag.

9 is a cross-sectional view taken along line 9-9 of FIG.

FIG. 10 is a cross-sectional view of a passenger seat airbag device according to a third embodiment.

FIG. 11 is a perspective view showing an inner bag of the airbag device.

FIG. 12 is a cross-sectional view showing a normal airbag device.

FIG. 13 is a perspective view of a passenger seat airbag device according to a fourth embodiment.

FIG. 14 is a vertical cross-sectional view of the airbag device.

FIG. 15 is a plan view showing a different structure of the base fabric of the inner bag.

FIG. 16 is a perspective view showing a different structure of the inner bag.

[Explanation of symbols]

21 ... Air bag device for passenger seat, 22 ... Windshield, 23 ... Instrument panel, 24 ... Case, 2
6 ... Inflator, 29 ... Airbag, 31 ... Inner bag, 31a ... Side wall, 31c ... Body part, 33 ... Exhaust port, 3
4 ... Door, 37 ... Base cloth, 39 ... Side wall part, 42 ... Exhaust opening opening, 45 ... Base cloth, 46 ... Exhaust opening opening, 47 ... Inflator mounting part, 48 ... Seam, 52 ...
Seams, W1, W2, W3, W4 ... Width dimensions.

Claims (8)

(57) [Claims] The method according to claim 1] inner bag gas from the gas ejection port of the inflator is blown inside the passenger airbag apparatus provided in the air bag, the gas port paired countercurrent portion of the inner bag Previous
In addition to forming a tubular closed portion extending in the longitudinal direction of the inflator, forming side walls at both ends of the closed portion so that the tip of the side wall is formed.
Join the edges to the inside of the airbag to secure the ends and sidewalls of the obstruction.
Form an exhaust port that opens to the side between
Passenger airbag device that supplies gas into the airbag via the exhaust port . 2. The airbag apparatus for a passenger seat according to claim 1, wherein the leading edge of the side wall is located at a position where the closed portion is joined to the airbag.
An airbag device for the passenger seat that is joined to the airbag inside . 3. The gas from the gas outlet of the inflator is
Equipped with an inner bag ejected inside the airbag
In the passenger-side airbag device, a portion of the inner bag facing the gas ejection port is provided in front of
Forming a tubular block that extends in the longitudinal direction of the inflator
And open laterally at both ends of the block.
To form an exhaust port through which the inside of the airbag
Configured to supply gas to the inner bag width dimension
Larger than the width of the airbag in the inner bag
An airbag device for the passenger seat that is set to be comfortable . 4. The passenger airbag apparatus according to claim 3 , wherein a width dimension of the inner bag is a maximum width dimension of the airbag.
An airbag device for the passenger seat set to have the same level . 5. The airbag apparatus for a passenger seat according to claim 3 or 4 , wherein the airbag has a substantially quadrangular pyramid shape that widens toward an occupant side.
To the width of the inner bag.
The width of the corresponding position in the
A fixed airbag device for the passenger seat. 6. An airbag device for a passenger seat according to claim 5.
In the storage, the inner bag has one base cloth folded at the center,
Both excluding inflator attachment portion of the opening and the proximal end of both side ends
An airbag device for the passenger seat, which is formed into a nearly T-shape by joining the side edges . 7. The airbag apparatus for a passenger seat according to claim 6, wherein both sides of the central folded portion of the inner bag are folded.
An airbag device for the passenger seat, which is joined from the side of the folded back part leaving the opening . 8. An air bag for controlling the flow of gas.
Instrument bag with inner bag facing the windshield
In the passenger- side airbag device disposed on the upper surface of the instrument panel, the inner bag is formed into a bag shape having a side wall,
Exhaust port is formed only on the surface of the bag facing the windshield
All gas into the airbag through the exhaust port
An airbag device for the passenger seat that is designed to be supplied .