JPH11321536A - Air bag for side air bag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air bag for a side air bag device capable of promptly and efficiently performing connecting work to an inflator, by eliminating deviating and turning over of an inner tube in the case of inserting the inflator to a connection cylinder part. SOLUTION: An air bag 41, stored to be folded in an opening peripheral edge in an in-car side, is formed as a constitution inflating a bag-shaped inflation part 43c expanded so as to cover an opening when inflating gas from an inflator of cylinder type flows in, and is provided with a connection cylinder part 50 connecting the bag to the inflator by inserting it. The connection cylinder part 50 is constituted by equipping a cylindrical gas inflow part 43d arranged in an outer peripheral side to communicate with the inflation part 43c and inner tubes 46, 47 arranged in an internal peripheral side of the gas inflow part 43d. The gas inflow part 43d and the inner tubes 46, 47 are connected by forming a mutually fusing fusion part 48.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag for a side airbag device mounted on a motor vehicle, and more particularly, to an airbag which is folded and stored around an opening inside the vehicle to cover the opening when inflation gas flows. The present invention relates to an airbag of a side airbag device for expanding and inflating a bag-shaped inflatable portion as described above.

[0002]

2. Description of the Related Art Conventionally, an airbag of this type of side airbag device is folded and housed over a pillar portion and a roof side rail portion at an opening edge of a door or a window inside a vehicle. When the inflation gas flows in,
The bag-shaped inflatable portion is expanded and inflated so as to cover the opening (Japanese Patent Application Laid-Open Nos. 9-240409 and 9-3152).
No. 53, etc.).

[0003] This airbag was provided with a connecting cylinder portion for connecting to an inflator for supplying inflation gas. Since the inflator is disposed in a narrow space below the pillar portion, the inflator is of a cylinder type.

[0004] Then, an inflator is inserted into the connecting cylinder portion of the airbag so that the connecting mode is not bulky.
Had been linked.

In addition, the connecting tubular portion of the airbag does not consist of only one cylindrical gas inflow portion communicating with the inflating portion, but improves heat resistance in consideration of a high-temperature inflating gas. For this purpose, an inner tube is disposed on the inner peripheral side (see UK Patent Application Publication No. 2314300 (publication date: December 24, 1997)).

However, in the conventional connecting cylinder, the inner tube is simply inserted and disposed on the inner peripheral side of the gas inflow section. Therefore, when the inflator is inserted into the connecting cylinder, the inner tube is shifted or the inner tube is displaced. Inserting the inflator while turning the rim of the tube, etc., may cause the inflator to be connected to the connecting tube in a state where the inner tube cannot serve its function. It had to be inserted into the part, and the connection work was troublesome.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and when inserting an inflator into a connecting cylinder portion, it is possible to quickly and efficiently connect the inflator to the inner tube without displacing or turning the inner tube. An object of the present invention is to provide an airbag of a side airbag device that can be used.

[0008]

SUMMARY OF THE INVENTION An airbag according to the present invention is folded and housed on the periphery of an opening on the inside of a vehicle, and when air for inflation flows from a cylinder-type inflator.
As a configuration for expanding and inflating the bag-shaped inflatable portion so as to cover the opening, a connecting tube portion for inserting the inflator and connecting to the inflator is provided,
An airbag for a side airbag device, comprising: a cylindrical gas inflow portion disposed on an outer peripheral side and communicating with the inflating portion; and an inner tube disposed on an inner peripheral side of the gas inflow portion. Wherein the gas inflow portion and the inner tube are connected to each other by forming a welded portion for welding each other.

[0009]

In the airbag according to the present invention, the gas inflow portion and the inner tube of the connecting cylinder are connected to each other by forming a welding portion for welding each other, so that the inflator is inserted into the connecting cylinder. At this time, the inner tube is prevented from being shifted or turned up by the welded portion, and the inflator can be smoothly inserted into the inner tube.

Therefore, in the airbag according to the present invention, when the inflator is inserted into the connecting cylinder, the inner tube can be quickly and efficiently connected without displacing or turning up the inner tube.

In the airbag according to the present invention, the gas inflow portion and the inner tube are connected to each other by a welded portion welded to each other, and the gas inflow portion and the inner tube are connected in advance so that the head of the sewing machine cannot be inserted. Even if the inflow section and the inner tube are formed in a small-diameter cylindrical shape, for example, the vibrator is arranged on the outer peripheral surface side of the gas inflow section, and the receiving table facing the vibrator is elongated and inserted into the inner tube. This makes it possible to easily connect the gas inflow portion and the inner tube using ultrasonic welding or the like.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The airbag 41 of the embodiment shown in FIGS. It is used for a side airbag device M provided over the front pillar portion PF and the roof side rail portion R.

The side airbag device M includes an airbag 4
1, an inflator 39 for supplying an inflation gas to the folded airbag 41, and connecting the airbag 41 and the inflator 39 to each other.
9 is provided with an attachment bracket 36 that attaches and fixes 9 to the side panel 2 of the body 1, and an airbag cover 70 that covers the folded airbag 41. In the case of the embodiment, the airbag cover 70 includes the garnish 11 arranged on the front pillar portion PF and the roof interior material 31 arranged on the roof side rail portion R.

The side airbag device M of the embodiment
Is attached to the pillar body 4 and the roof side rail body 9 of the body 1 as shown in FIG.
It is handled as an airbag assembly A.

The front pillar portion PF will be described. As shown in FIGS. 2 to 5, the pillar portion PF includes a folded airbag 41, a reinforcement panel 5, an inner panel 7, and a reinforcement panel formed of a steel plate. It comprises a pillar body 4 on the side of the body 1 having an outer panel 6 and a garnish 11 assembled to the inner panel 7.

At predetermined positions of the inner panel 7, mounting holes 7a for assembling the garnish 11 (see FIG. 5),
A locking hole 7c (see FIG. 3), a locking hole 7d (see FIGS. 2 and 17) along the front pillar portion PF, and a mounting hole 7g (see FIG. 4) for attaching the folded airbag 41 are formed. I have. A nut 7b is fixed to the mounting hole 7a, a bolt 29 for mounting the garnish 11 is inserted, and a locking leg 17 of the garnish 11 is inserted into the locking hole 7c.
Is inserted and locked. A metal locking pin 2 insert-molded in the garnish 11 is provided in the locking hole 7d.
1 is inserted and locked. The mounting hole 7g is configured such that a nut 7h is fixed to a peripheral edge on the back surface side (outside of the vehicle) of the inner panel 7. Further, a weather strip S is attached to an end of the pillar body 4. In addition,
Reference numeral D shown in FIGS. 2 to 6 is a door.

The garnish 11 includes a garnish body 12 formed of a synthetic resin such as an olefin-based thermoplastic elastomer, a locking pin 21 that is insert-molded into the garnish body 12, and a cap 25 that is fitted into the garnish body 12. It is configured.

The garnish body 12 includes a long molded portion 12a formed by injection molding and a skin 12 such as a fabric adhered to the design surface side of the garnish body 12.
e, the molded portion 12a is provided with a door portion 12d at the edge on the opening W side with a thin hinge portion 12c interposed therebetween, and when the airbag 41 is deployed and inflated, the molded portion 12a is formed. With respect to the general portion 12b, the door portion 12d can be opened around the hinge portion 12c as a center of rotation. The general portion 12b has a mounting boss 13, a locking leg 17, and a buried portion 19, which will be described later.

As shown in FIG. 5, a mounting hole 13a through which a mounting bolt 29 is inserted is provided in an upper portion of the garnish body 12.
Is formed. Mounting hole 13
A metal sleeve 15 is fitted on the inner peripheral surface of a so as to secure the tightening force of the mounting bolt 29 when the garnish 11 is mounted on the inner panel 7. Also,
A storage recess 14 into which a cap 25 is fitted is formed around the mounting boss 13 on the front side (inside the vehicle) of the garnish body 12. The cap 25 conceals the mounting bolt 29, and includes a molded portion 25a formed by injection molding from a synthetic resin such as polyamide, and a molded portion 25a.
and a skin 25c of the same quality as the skin 12e to be adhered to a. The mounting bolt 2 is attached to the molded portion 25a.
A locking claw 25b is formed to be locked in a locking groove 29b provided in the head 29a of the ninth head. The cap 25 is provided with a storage recess 14 in order to prevent the cap 25 from coming off from the garnish body 12 even if the cap 25 comes off the bolt 29.
Is provided with a retaining member that can be locked to a peripheral edge of the through-hole through a through-hole (not shown) provided in the above.

Back side of garnish body 12 (outside of car)
As shown in FIG. 2, a buried portion 19 in which a locking pin 21 is buried is formed at a lower part of the embedment. Locking pin 21
Is a disc-shaped embedding portion 21 a embedded in the embedding portion 19.
, A shaft portion 21b, and a disk-shaped locking portion 21c, and a wide portion 7e and a narrow portion 7f formed on the inner panel 7 as shown in FIGS. The locking portion 21c is locked on the periphery of the narrow portion 7f of the locking hole 7d. The wide portion 7e has a dimension and shape that allows the locking portion 21c to be inserted from the front side (inside of the vehicle), and the narrow portion 7f extends obliquely upward along the front pillar portion PF from the wide portion 7e to form the shaft portion 21b. The opening is formed in a width dimension that allows the insertion of the locking portion 21c so that the locking portion 21c cannot be removed. The buried part 1
On the front side (inside of the vehicle) of 9, a large number of meat stealing holes 19a are formed in order to suppress the influence of sink marks.

As shown in FIG. 3, a locking leg 17 which is inserted and locked into the locking hole 7c of the inner panel 7 is formed at a substantially middle portion in the vertical direction on the back side of the garnish body 12. .

When the garnish 11 is attached to the pillar body 4, the locking portion 21c is inserted from the wide portion 7e (inserted into the position of 21cP indicated by the two-dot chain line in FIG. 17), and then the narrow portion 7f is inserted. The locking portion 21c is shifted (shifted to the position indicated by the solid line in FIG. 17), the locking leg portion 17 is inserted and locked in the locking hole 7c, and the mounting hole 13a of the mounting boss portion 13 is further locked.
The mounting work can be completed by screwing the mounting bolt 29 to the nut 7b provided in the mounting hole 7a via the sleeve 15 fitted to the mounting hole 7a, and then fitting the cap 25 into the storage recess 14.

The garnish 11 is provided with the airbag 4.
When the airbag 41 is deployed and inflated, the locking leg 17 is disengaged from the locking hole 7c by being pushed by the airbag 41, and the locking portion 21c of the locking pin 21 slides to the position of 21cB indicated by a two-dot chain line in FIG. Then, the substantially vertical intermediate portion of the garnish 11 moves toward the inside of the vehicle so as to be separated from the inner panel 7, and further, the door 12d is opened, thereby causing the airbag 41 to protrude greatly.

Next, a description will be given of the roof side rail portion R. As shown in FIG. 6, the roof side rail portion R includes, in addition to the folded airbag 41, a roof side rail main body on the body 1 side made of a steel plate. 9 and a roof interior material 31 that is assembled to the body 1 at a predetermined portion (not shown).

In the roof side rail main body 9, a mounting hole 9 for mounting the folded airbag 41 is provided at a predetermined position.
a is formed. The mounting hole 9a is configured such that a nut 9b is fixed to a peripheral edge on the back surface side (outside of the vehicle) of the roof side rail main body 9. A weather strip S is attached to an end of the roof side rail main body 9.

The roof interior material 31 is a synthetic resin material having flexibility such that when the airbag 41 is inflated, the edge 31a on the opening W side is pushed by the airbag 41 and easily separated from the roof side rail body 9. Is formed from.

The airbag assembly A in the side airbag device M of the embodiment is, as shown in FIG.
An airbag 41, an inflator 39, a mounting bracket 36 connecting the airbag 41 and the inflator 39, a mounting bracket 54 assembled to the airbag 41, and mounting the airbag 41 to the body 1;
Tape material 57 surrounding the folded airbag body 42
And is composed of The tape member 57 is provided with a twist identification mark 59 on the inner surface of the vehicle to prevent the airbag body 42 from being twisted and attached to the body 1.

As shown in FIGS. 8 to 11, the airbag 41 receives an inflation gas from the inflator 39, expands from a folded state, and inflates to increase its thickness. The air conditioner includes a connection cylinder portion 50 connected to the inflator 39 and a plurality of attachment pieces 52 provided on the upper edge side of the airbag body 42.

The airbag body 42 is formed by bag weaving using polyamide yarn or the like, and has a bag portion 43 having an inner side wall portion 43a and an outer side wall portion 43b. It is provided with a connecting portion 44 densely woven so as to seal the bag portion 43 and the like, and a plate portion 45 woven in a thin plate shape around the connecting portion 44. After the bag is woven, the airbag body 42 is formed with a coating layer coated with silicon or the like so as to increase heat resistance and prevent leakage of the inflation gas. Incidentally, this coating layer is formed on the outer peripheral surface side since the coating material cannot be applied to the inner peripheral surface side after weaving.

The bladder 43 has an inflatable portion 43c which inflates the inflatable gas so as to increase the thickness thereof, and an inflatable portion 4c.
3c, and a gas inflow portion 43d that allows the inflation gas to flow therethrough.

As shown in FIGS. 8 and 9, the connecting portion 44 includes a peripheral edge connecting portion 44a densely woven so as to seal the bag portion 43 around the bag portion 43, and an expanding portion 43c in the bag portion 43.
Near the center of the vehicle, two central connecting portions 4 densely woven so as to connect the inner side wall portion 43a and the outer side wall portion 43b.
4b. Central joint 44b / 44
b is such that when the bag portion 43 is inflated, the tension is exerted from the connecting tubular portion 50 to the rear upper portion of the airbag body 42 so that the inflatable portion 43c receives the pressing force to the outside of the vehicle. It is provided so as not to move to.

The plate-like portion 45 secures the overall shape of the airbag 41 from the connecting tubular portion 50 to the rear upper portion of the airbag body 42 and reduces the volume of the bag portion 43,
It is set to shorten the time until inflation is completed,
It comprises a front plate-like portion 45a connecting the gas inflow portion 43d and the expansion portion 43c, and a rear plate-like portion 45b connecting the expansion portion 43c and the rear mounting piece 52B.

The connecting tube portion 50 is a portion connected to the inflator 39 by inserting the inflator 39 and tightening the mounting bracket 36 toward the inflator 39, and is disposed at the tip of the gas inflow portion 43d. .

The connecting cylinder 50 is provided with the gas inflow section 4.
On the inner peripheral side of 3d, cylindrical long and short inner tubes 46 and 47 are arranged in order to ensure heat resistance against a high-temperature inflation gas from the inflator 39. As shown in FIGS. 10 to 13, the inner tubes 46 and 47 are also formed by bag weaving using a polyamide yarn or the like, respectively.
Cylindrical main body portions 46a and 47a, and main body portions 46a and 47a
Peripheral joint 46b tightly woven to seal the edges of
47b. After weaving, these inner tubes 46 and 47 also have a coating layer coated with silicon or the like formed thereon in order to enhance heat resistance, and further, such coating layers are arranged on the inner peripheral surface side. It is turned upside down and inserted sequentially into the gas inflow section 43d. The inner tube 46 is connected to the gas inlet 43 d in the bag 43 of the airbag body 42.
The inner tube 47 is disposed so as to extend to the expansion portion 43c.
6 and is arranged so as to extend to the vicinity of an intermediate portion of the gas inflow portion 43d.

Further, in order to easily confirm whether or not the inner tubes 46 and 47 are provided, the inner tubes 46 and 47 on the inner peripheral side are sequentially arranged at the end on the side of the connecting cylinder 50. 47 are arranged so that the end portions 46c and 47c protrude.

And, these inner tubes 46.4
As shown in FIGS. 8 and 10, welding portions 48 are formed at two places on the end side of the connecting tube portion 50 so as not to be displaced with respect to the gas inflow portion 43 d, Part 4
The three inner tubes 46 and 47 are connected to each other.

In the case of the embodiment, the welding portion 48
48 is formed using ultrasonic welding. Also,
In the case of the embodiment, the position of the welded portion 48 is arranged at a distance L of about 5 mm from the end surface of the connecting tubular portion 50.

As shown in FIGS. 4 and 6 to 8, each mounting piece 52 can be mounted to the pillar body 4 or the roof side rail body 9 of the body 1 by using mounting bolts 55. The attachment hole 52a is penetrated, and the attachment bracket 54 is fixed. Each of the mounting brackets 54 is provided at an inner side portion and an outer side portion of each mounting piece portion 52, and is provided with a mounting hole 5 communicating with the mounting hole 52a.
4c, the inner and outer plates 54a and 54b are made of sheet metal, and each of the attachment pieces 52 is interposed between the inner and outer plates 54a and 54b to form a crooked portion for partially bending. By doing so, the inner and outer plates 54a
-54b is attached to each attachment piece 52. The center pillar PC on the roof side rail R side.
The two mounting brackets 54 arranged in the vicinity of FIG.
-As shown by the two-dot chain line of 7, there is provided an extending portion 54d extending downward by connecting the two. This extension 54d
When the airbag body 42 is inflated, the airbag body 4
2 serves as a guide portion for guiding the vehicle inside the center pillar PC so as not to enter between the interior material inside the vehicle and the pillar body.

The inflator 39 is, as shown in FIG.
9b, an inflator body 39a which can be discharged from the inflator 9b, and a diffuser 39 which is fixed to the inflator body 39a and is made of a substantially cylindrical sheet metal and guides the inflation gas in the axial direction.
e. Inflator body 3
A lead wire 39d for inputting a signal for discharging the inflation gas is connected to 9a. A male screw portion 39c is formed on the end portion side of the inflator body 39a, and a corresponding female screw portion 39f is formed on the diffuser 39e. It is fixed to the main body 39a.

As shown in FIGS. 15 and 16, the mounting bracket 36 is formed of sheet metal and has a cylindrical tubular portion 36 a disposed around the connecting tubular portion 50 of the airbag 41 provided on the inflator 39. , Extending from the cylindrical portion 36a,
And a bracket body 36c attached to the side panel 2 of the body 1 with the attachment bolts 37.
At both ends of the cylindrical portion 36a, a cylindrical caulking portion 36b that can be caulked and reduced in diameter is formed.
Two mounting holes 36d through which the mounting bolts 37 are inserted are formed.

The tape member 57 is formed from an adhesive tape such as cloth or paper. Then, the tape member 57 is wound around the folded airbag body 42, and as shown in FIG.
The airbag body 42 is provided on the inner surface of the vehicle using a pen or the like.
And a mark 59 painted with a color different from that of the tape material 57.

Next, an airbag assembly A is formed,
An operation of attaching the airbag assembly A to the body 1 will be described. First, the airbag 41 is manufactured in advance.

The airbag 41 is manufactured by previously weaving the airbag body 42 and the inner tubes 46 and 47, and then applying a coating agent on the surface side to form a coating layer. The inverted inner tubes 46 and 47 are sequentially inserted into the gas inflow portion 43d of the main body 42 to expose their ends 46c and 47c. Then, the vibrator is arranged on the outer peripheral surface side of the gas inflow portion 43d, and an elongated cradle facing the vibrator is inserted into the inner tube 47, and the welded portions 48 and 48 are formed by ultrasonic welding. If the inflow portion 43d and the inner tubes 46 and 47 are fixed to each other, the airbag 4
1 can be manufactured.

After the manufacture of the airbag 41, the airbag body 42 is folded by a predetermined folding machine, wrapped with a tape material 57 as appropriate, and marked 59. In addition, this folded state is sequentially applied to a portion indicated by a two-dot chain line in FIG.
The bellows fold is formed by folding a fold C between a mountain fold and a valley fold.

Thereafter, the inner and outer plates 54a and 54a are provided on both sides of each mounting piece 52 while aligning the mounting holes 52a and 54c.
The predetermined parts are mounted, and a predetermined part is caulked, and a predetermined mounting bracket 54 is mounted on each mounting piece part 52. In addition,
The mounting piece 52 in the folded state is pulled out,
The mounting bracket 54 is to be attached to the site.

Further, the folded connection cylinder 50 is also released from being folded, and the inflator 39 is inserted into the inner tube 47 of the connection cylinder 50. At this time, the gas inflow portion 43d of the airbag body 42 and the inner tubes 46.4 are used.
7 are not displaced from each other by the welded portions 48, 48, and as shown by the two-dot chain line in FIG.
The inflator 39 can be inserted smoothly without the end portion 47a of the 7 being turned up.

Next, the cylindrical portion 36a of the mounting bracket 36
Is externally provided on the connecting tubular portion 50 of the airbag 41, and the caulked portions 36b are crimped to reduce the diameter.
9 and the connection cylinder 50, and the mounting bracket 36 is attached to the connection site.

Then, a predetermined mounting bracket 54
If the mounting bolts 55 are temporarily assembled, the airbag assembly A can be assembled.

Thereafter, as shown in FIGS. 1, 4, and 6, the airbag assembly A is attached to the body 1 by placing the bracket body 36c of the mounting bracket 36 at a predetermined position on the side panel 2, and Attach the mounting bolt 37 to the mounting hole 36
d, and fasten to the side panel 2 so that the mounting holes 54c, 52a, 7g, and 9a match each other.
The respective mounting brackets 54 are arranged on the inner panel 7 and the roof side rail body 9 of the body 1, respectively.
The mounting bolt 55 is screwed into the nuts 7h and 9b via the mounting holes 52a and 54c.

At the time of mounting, in the airbag assembly A of the embodiment, whether the airbag body 42 is twisted or not is determined.
Since it is possible to immediately determine whether or not the mark 59 of the tape material 57 is clearly displayed, the work efficiency at the time of attachment can be improved.

After the airbag assembly A is attached to the body 1, the lead wire 39d is connected to a predetermined airbag operating circuit, and as shown in FIGS. The garnish 11 is attached and fixed to the inner panel 7, and the roof side rail portion R is covered with a roof interior material 31 assembled to a predetermined portion of the body 1.

Thereafter, when the inflator 39 is operated, the inflation gas flows into the bag portion 43 of the airbag body 42 of the airbag 41, and the gas inflow portion 43d and the inflation portion 43c of the bag portion 43 are inflated. The tape material 57 is broken, and the garnish 11 of the pillar portion PF is pushed by the airbag body 42, so that the locking leg 17 comes off from the locking hole 7c as shown by the two-dot chain line in FIGS. At the same time, the locking portion 21c of the locking pin 21 slides along the front pillar portion PF to a position indicated by a two-dot chain line 21cB in FIG. 6, the door portion 12d is opened, and the roof interior material 31 of the roof side rail portion R is pushed by the airbag body 42, and the two-dot chain in FIG. As shown by, the edge 31a of the roof interior material 31 is opened, and as a result, the airbag body 42 is largely deployed and inflated so as to cover the opening W as shown by a two-dot chain line in FIG. .

As described above, the airbag 41 of the embodiment
Then, the gas inflow portion 43d and the inner tubes 46 and 47 of the connecting cylinder portion 50 are welded to each other by welding portions 48 and
48 are formed and connected, so that the connecting cylinder 50
When the inflator 39 is inserted into the inside, the inner tubes 46 and 47 are prevented from being shifted or turned up by the welded portions 48 and 48, and the inflator 3
9 can be smoothly inserted into the inner tube 47, and the connection work with the inflator 39 can be performed quickly and efficiently.

In the airbag 41 of the embodiment,
The gas inflow portion 43d and the inner tubes 46 and 47 are connected to each other by welding portions 48 and 48 welded to each other, and the gas inflow portion 43 and the inner tubes 46 and 47 do not allow the head of the sewing machine to be inserted. Even if 47 is formed in a tubular shape with a small diameter by bag weaving, if a vibrator is arranged on the outer peripheral surface side of the gas inflow portion 43d, a long and narrow receiving table facing the vibrator is inserted into the inner tube 47. The gas inlet 43d and the inner tubes 46 and 47 can be easily connected by using ultrasonic welding.

In the case of the embodiment, the welding portion 48
48 is formed using ultrasonic welding, but alternatively, a welded portion may be formed using a heater or a high frequency welder.

In the case of the embodiment, the gas inflow portion 43d
The inner tubes 46 and 47 disposed in the
Since c and 47c are arranged so as to be exposed,
The presence or absence of the arrangement of the inner tubes 46 and 47 can be easily confirmed.

Further, in the case of the embodiment, the welding portion 48 is
By providing a distance L of about 5 mm from the end face of the connecting cylinder 50, 2
But when the inflator 39 is inserted,
The end portions 46c and 47c of the inner tubes 46 and 47 do not shift or turn with respect to the gas inflow portion 43d.
If they are welded to each other, one or three or more may be provided with the distance L from the end face being less than 10 mm.
By the way, if the distance L exceeds 10 mm, the inflator 39 easily enters between the inner tubes 46 and 47 or between the inner tube 46 and the gas inflow portion 43d, which is not preferable.

Further, in the embodiment, the case where two inner tubes 46 and 47 are provided is shown, but one may be used as long as the heat resistance of the gas inflow portion 43d can be ensured. Of course, three or more inner tubes may be provided.

Further, in the case of the embodiment, the case where the airbag body 42 and the inner tubes 46 and 47 are formed by weaving is shown. However, one flat cloth is folded and overlapped with each other. A predetermined portion such as a peripheral edge may be stitched to form the airbag body 42 and the inner tubes 46 and 47, which may be welded to each other.

Furthermore, in the airbag 41 of the embodiment, the front pillar portion PF is connected to the roof side rail portion R.
Although the airbag used for the side airbag device M is shown in the drawings, the airbag may be arranged from the rear pillar portion or the center pillar portion PC to the roof side rail portion R. The inflator 39 is disposed below the rear pillar portion and the center pillar portion PC, and the connecting tubular portion 50 is connected to the inflator 39.

[Brief description of the drawings]

FIG. 1 is a front view showing a use state of a side airbag device using an airbag according to an embodiment of the present invention.

FIG. 2 is an enlarged schematic cross-sectional view of a II-II portion in FIG.

FIG. 3 is an enlarged schematic sectional view of a III-III part in FIG. 1;

FIG. 4 is an enlarged schematic cross-sectional view taken along a line IV-IV in FIG.

FIG. 5 is an enlarged schematic cross-sectional view taken along a line VV in FIG.

FIG. 6 is an enlarged schematic cross-sectional view of a VI-VI portion in FIG.

FIG. 7 is a front view showing an airbag assembly used in the embodiment.

FIG. 8 is a front view of the airbag of the embodiment in a deployed state.

FIG. 9 is an enlarged sectional view of a portion IX-IX in FIG.

FIG. 10 is an enlarged sectional view of a portion XX in FIG. 8;

FIG. 11 is an enlarged sectional view of a portion XI-XI in FIG. 8;

FIG. 12 is a front view showing the inner tube of the embodiment.

FIG. 13 is a front view showing another inner tube of the embodiment.

FIG. 14 is a diagram showing a fold when the airbag body of the embodiment is folded.

FIG. 15 is a longitudinal sectional view showing a connection portion between the airbag and the inflator of the embodiment.

FIG. 16 is a perspective view of a mounting bracket used for connecting the airbag and the inflator of the embodiment.

FIG. 17 is a view showing one locking hole of the inner panel in the pillar portion of the embodiment, as viewed from the XVII direction in FIG. 2;

[Explanation of symbols]

 39 ... inflator, 41 ... airbag, 43c ... inflating section, 43d ... gas inflow section, 46/47 ... inner tube, 48 ... welding section, 50 ... connecting cylinder section, W ... opening, M ... side airbag device.

Claims (1)

[Claims] 1. The inflator according to claim 1, wherein the bag-like inflator is configured to be folded and housed at a periphery of an opening on the inner side of the vehicle and to expand and inflate a bag-shaped inflatable portion so as to cover the opening when inflation gas flows from a cylinder-type inflator. And a connecting tube portion that is inserted into and connected to the inflator. The connecting tube portion is disposed on an outer peripheral side and communicates with the inflating portion. An inner tube disposed on the side airbag device, wherein the gas inflow portion and the inner tube are connected to each other by forming a welded portion for welding each other. An airbag for a side airbag device.