JPH10175499A - Side air bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a side air bag whereby sure efficient inflation and miniaturization of an inflator can be attained though cost is reduced further with a constitution simplified. SOLUTION: An inflator 4 jetting a pressure fluid is stored in a supply part 3a, a body protecting part 3b communicating with the supply part 3a is extended toward the car body forward from the supply part 3a, a head protecting part 3c communicating with the body protecting part 3b is extended toward the car body upward from the body protecting part 3b, a total unit is formed in almost an L shape, also by a pressure fluid jetted according to action of the inflator 4, after inflating the body protecting part 3b, so as to inflate the head protecting part 3c, in a boundary part between the body/head protecting parts 3b, 3c, a fuse sewed part impeding introduction of the pressure fluid to a prescribed pressure in the head protecting part 3c is provided, also the head protecting part 3c, after it is superposed together in the body protecting part 3b, is stored in an air bag device in a folded or wound condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pair of front and back cloth bodies which are joined to form a bag by joining the peripheral edges thereof, and which swells from an air bag device provided in the seat back to provide a space between the seat and the side door. The present invention relates to a side airbag that protects a range extending from a trunk to a head of an occupant by inflating the airbag.

[0002]

2. Description of the Related Art Conventionally, as a countermeasure against a so-called side collision, for example, an airbag device is installed in a front seat back,
A front side airbag that inflates between the front seat and the front side door to protect the range from the torso of the occupant to the head after swelling from the airbag device due to the ejection of pressure fluid due to the operation of the inflator. Are known.

[0003]

By the way, such a front side airbag is inflated so as to avoid a shoulder seat belt extending from an upper portion of a vehicle body center pillar via a shoulder portion of an occupant to a lower buckle near a vehicle center. And the front side door and the occupant,
Due to differences in the distance between the occupant's torso and the front side door and the distance between the occupant's head and the front side door,
It is preferable to provide a time difference between the protection of the torso and the protection of the head from the viewpoint of effective expansion efficiency and miniaturization of the inflator.

The present invention has been made in view of the above circumstances, and provides a front side airbag which can realize reliable and efficient inflation and downsizing of an inflator while having a cheap and simple structure. The purpose is to do.

[0005]

In order to achieve the object, according to the first aspect of the present invention, a pair of front and back cloth bodies are joined to form a bag by joining the peripheral edges thereof and provided on a seat back. In the side airbag, which inflates from the airbag device and inflates between the seat and the side door to protect a range extending from the torso of the occupant to the head, the set of cloth bodies is ejected with a pressure fluid. A supply section in which the inflator is stored, a body protection section extending forward from the supply section and communicating with the supply section; a body protection section extending upward from the body protection section; The torso protection part and the head protection part communicated with each other form a substantially L-shape, and the head protection part expands after the torso protection part expands due to the pressure fluid ejected by the operation of the inflator. So that the torso protection part and the A fuse sewn portion is provided at a boundary portion between the head protection portion and the fuse protection portion to prevent introduction of a pressure fluid to the head protection portion to a predetermined pressure, and is folded or stored after the head protection portion is stored in the body protection portion. The gist is to be housed in the airbag device in a wound state.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a side airbag according to the present invention will be described with reference to the drawings as applied to a front side airbag for a left passenger seat.

(First Embodiment) FIGS. 1 to 4 show a first embodiment of a side airbag of the present invention. This figure 1
1A and 1B, reference numeral 1 denotes an occupant, 2 denotes a front seat, and 3 denotes a front side airbag.

This front side airbag 3 is shown in FIG.
As shown in (A) and (B), the periphery of one cloth body N1 and N2 each having a substantially L-shape is formed by double sewing P1 and P2.
2, a supply section 3a in which an inflator 4 for ejecting a pressurized fluid is housed, and a body protection extending from the supply section 3a toward the front of the vehicle body and communicating with the supply section 3a. A portion 3b and a head protection portion 3c extending upward from the body protection portion 3b toward the vehicle body and communicating with the body protection portion 3b are integrally formed. It is housed in an airbag device (not shown) provided in 2a.

The supply section 3a includes reinforcing cloths N3 and N4.
Are joined together with the cloth bodies N1 and N2 by sewing P1 and P2. An opening 3d for inserting the inflator 4 therein is formed in the supply section 3a by partially sewing the supply section 3a. The position of the opening 3d is not limited to the illustrated example. Further, mounting holes 3e and 3f through which mounting protrusions 4a and 4b formed on the inflator 4 (or a diffuser (not shown) containing the inflator 4) penetrate are provided in the cloth bodies N2 and N4 located at the supply section 3a. In the cloth bodies N1, N2, N3, and N4, a part close to the opening 3d of the supply portion 3a is turned back and penetrated through the mounting protrusion 4b protruding from the mounting hole 3f, thereby closing the opening 3d. A hole 3g is formed.

On the other hand, a fuse sewn portion P3 extending over the entire width of the boundary portion is provided at the boundary between the trunk portion protection portion 3b and the head protection portion 3c. The torso protection part 3b and the head protection part 3c are substantially symmetrical with respect to this boundary part, or the head protection part 3c is more suitable for the torso protection part 3b.
The shape is slightly smaller than the same shape, so that the head protection portion 3c, which will be described later, can be easily housed in the trunk portion protection portion 3b and fits easily.

The fuse sewn portion P3 is connected to the front side airbag 3 due to the ejection of the pressurized fluid from the inflator 4.
Expansion of the head protection part 3c after expansion of the trunk protection part 3b.
Is set so as to prevent the pressure fluid from being introduced into the head protection portion 3c to a predetermined pressure so as to expand. For example, the strength is increased by sewing with a thread having a lower strength than the threads used for the sewing P1 and P2. Is set.

As shown in FIGS. 3A and 3B,
The second fuse stitch portions P4 and P5 are provided in the head protection portion 3c, and the expansion of the head protection portion 3c is made more stepwise by the second fuse stitch portions P4 and P5, and pressure fluid is introduced by the fuse stitch portion P3. It is also possible to set so that the pressure fluid in the torso protection part 3b at the time of release does not suddenly flow to the head protection part 3c. Also, as shown in FIG.
A vent hole 3j is provided in the head protection part 3c, and the head protection part 3c
The pressure fluid after having expanded to the maximum may be drained.

FIGS. 4A to 4E show an example of storing the front side airbag 3 in the airbag device.
4 (B), (B) after the peripheral portions of each of the cloth bodies N1 and N2 each having a character shape are joined by double sewing P1 and P2 except for a part thereof to form a bag. As shown in C), the head protection part 3c is positioned inside the body protection part 3b by turning over the body protection part 3b using the opening 3d.

From this state, as shown in FIG. 4 (D) or FIG. 4 (E), a bellows-like folding or roll-up winding state is set, and the inflator 4 is supplied to the supply section 3a.
Is stored in the airbag device after storing.

At this time, at the time of the bellows-like folding, FIG.
As shown in (D), when it is folded so as to extend to the front of the vehicle body or such that the folded portion is located on the front side door side (not shown) and wound up in a roll shape, the winding is performed. The part is wound up so as to be located on the front side door side.

In the above configuration, the front side airbag 3 housed in the airbag device bulges out of the airbag device by the ejection of the pressurized fluid due to the operation of the inflator 4, and as shown in FIG. Then, the trunk portion protection portion 3b expands while the folded or wound state is released, and the trunk portion 1a of the occupant 1 is protected.

As shown in FIG. 1 (B), the sewn portion P3 of the fuse is cut and the head protection portion 3c in the housed state expands due to the continuation of the ejection of the pressurized fluid by the inflator 4, so that the head protection portion 3c of the occupant 1 is expanded. The part 1b is protected.

At this time, the front side airbag 3
Due to the L-shape, a shoulder seat belt 5 (see FIG. 1) that straddles a buckle (not shown) near the center of the vehicle body from the upper part of the vehicle body center pillar via the shoulder 1c of the occupant 1
By expanding so as not to be rubbed or rubbed (shown only in (B)), more reliable expansion can be realized.

By providing a time lag between the protection of the body 1a and the protection of the head 1b, efficient expansion and downsizing of the inflator can be realized.

(Embodiment 2) FIGS. 5 and 6 show a second embodiment of the front side airbag of the present invention, in which the front side airbag 3 of the first embodiment is more escaping from the shoulder seat belt 5 than the front side airbag 3. The front side airbag 13 is more reliable.

The front side airbag 13 is shown in FIG.
As shown in (A) and (B), the periphery of each of the cloth bodies N1 and N2 each having a substantially L-shape and having a constriction is joined by double sewing P1 and P2 to form a bag. Supply unit 13 in which the inflator 4 for ejecting the pressure fluid is stored.
a, a body protection section 13b extending from the supply section 13a toward the front of the vehicle body and communicating with the supply section 13a, and a body protection section 13b extending from the body protection section 13b toward the vehicle body upward. Is formed integrally with the head protection portion 13c, which communicates with the seat back 2 of the front seat 2 at all times.
1A is housed in an airbag device (not shown) provided in FIG.

The supply section 13a includes reinforcing cloths N3, N
4 are joined together with the cloth bodies N1 and N2 by sewing P1 and P2. The supply section 13a has an opening 1 into which the inflator 4 is inserted by unsewn a part thereof.
3d is formed. Further, mounting holes 13e and 13f through which mounting protrusions (not shown) formed on the inflator 4 penetrate are formed in the cloth bodies N2 and N4 located at the supply unit 13a, and the cloth bodies N1, N2 and N3 are formed. , N4 are formed with through-holes 13g, 13h for closing the opening 13d by turning a part of the supply portion 13a near the opening 13d to pass through the mounting protrusions projecting from the mounting holes 13e, 13f.

On the other hand, the torso protection part 13b and the head protection part 13
At a boundary portion with c, a fuse stitch portion P3 extending over the entire width of the boundary portion is provided. The torso protection part 13b and the head protection part 13c have a substantially symmetrical shape or a head protection part 13c around this constricted boundary part.
Has the same shape as that of the torso protection part 13b, which is slightly smaller than that of the torso protection part 13b, so that the head protection part 13c, which will be described later, can be easily stored in the torso protection part 13b.

The fuse stitch portion P3 is connected to the front side airbag 1 due to the ejection of the pressurized fluid from the inflator 4.
3 is set so as to prevent the introduction of the pressure fluid to the head protection portion 13c to a predetermined pressure so that the head protection portion 13c expands after the expansion of the trunk portion protection portion 13b. The strength is set by sewing with a thread having a lower strength than the thread used for sewing P1 and P2.

In the above configuration, the front side airbag 3 housed in the airbag device is inflated from the airbag device by the ejection of the pressurized fluid accompanying the operation of the inflator 4, and as shown in FIG. Then, the trunk portion protection portion 13b expands while the folded or wound state is released, and the trunk portion 1a of the occupant 1 is protected.

As shown in FIG. 5 (B), the sewn fuse section P3 is cut off and the head protection section 13c in the housed state expands due to the continuous ejection of the pressurized fluid by the inflator 4, so that the head protection section 13c of the occupant 1 is expanded. The part 1b is protected.

At this time, the front side airbag 13
Due to the L-shape having the constriction, only the shoulder seat belt 5 (FIG. 5 (B)) straddling from the upper part of the vehicle body center pillar via the shoulder 1c of the occupant 1 to the lower part buckle (not shown) near the vehicle center. (Shown) so as to avoid rubbing, so that more reliable expansion can be realized.

By providing a time difference between the protection of the body 1a and the protection of the head 1b, efficient expansion and downsizing of the inflator can be realized.

It should be noted that the head protection portions 3c and 13c may not be housed in the body protection portions 3b and 13b as described above, but may be simply bent using the fuse stitch portion P3 as a broken line. At this time, the head protection portion 13c is bent toward the occupant with respect to the trunk protection portion 13b.

[0030]

As described above, the front side airbag of the present invention has a substantially L-shape, and the body fluid protecting portion is formed by the pressurized fluid ejected by the operation of the inflator. A fuse sewn portion is provided at the boundary between the body protection portion and the head protection portion so as to prevent the introduction of pressure fluid to the head protection portion to a predetermined pressure so that the head protection portion expands after the head protection portion expands. Since the head protection part is superimposed on the trunk protection part and then stored in the airbag device in a folded or wound state, the inflator can be reliably and efficiently expanded and inflated with a low-cost and simple structure. Miniaturization can be realized.

[Brief description of the drawings]

1A and 1B show a front side airbag according to a first embodiment of the present invention, in which FIG. 1A is an explanatory view of a torso protection state by a front side airbag, and FIG. It is explanatory drawing of a part protection state.

FIG. 2A is a front view of a front side airbag, and FIG. 2B is a cross-sectional view taken along line AA of FIG. 2A.

FIG. 3 shows a modification of the front side airbag,
(A) is a front view of a front side airbag in which a second fuse stitch portion is provided vertically, (B) is a front view of a front side airbag in which a second fuse stitch portion is provided in an annular shape,
(C) is a front view of the front side airbag provided with a vent hole in the head protection part.

4A and 4B show an example of storage in an airbag device, wherein FIG. 4A is a front view of a front side airbag, FIG. 4B is a front view of the folded front side airbag, and FIG. FIG. 3D is a cross-sectional view taken along the line BB, FIG. 3D is a plan view of the front side airbag folded in a bellows shape, and FIG. 3E is a plan view of the front side airbag wound in a roll shape.

5A and 5B show a front side airbag according to a second embodiment of the present invention, wherein FIG. 5A is an explanatory view of a torso protection state by the front side airbag, and FIG. 5B is a torso and head by the front side airbag. It is explanatory drawing of a part protection state.

6A is a front view of the front side airbag, and FIG. 6B is a cross-sectional view taken along the line CC of FIG. 6A.

[Explanation of symbols]

 3. Front side airbag 3a Supply part 3b Trunk protection part 3c Head protection part 4. Inflator P3 Fuse sewing part

Claims (6)

[Claims] An occupant by joining peripheral edges of a pair of front and back cloth bodies into a bag shape, and swelling from an airbag device provided in a seatback and inflating between a seat and a side door. A side airbag that protects a range extending from a trunk portion to a head portion, wherein the set of cloth bodies extends forward from the supply portion in which a supply unit in which an inflator for ejecting a pressure fluid is stored is housed. A body protecting portion communicated with the supply portion, and a head protecting portion extending upward from the body protecting portion toward the vehicle body and communicating with the body protecting portion to have a substantially L shape. The boundary portion between the body protection part and the head protection part is expanded so that the head protection part expands after the body protection part expands due to the pressure fluid ejected with the operation of the inflator. Introduce the pressurized fluid to the head protection at a specified pressure. A side airbag provided with a fuse sewn portion for blocking the head protection portion, the head protection portion being overlapped with the body protection portion, and then folded or wound up in the airbag device. . 2. The side airbag according to claim 1, wherein the body protection portion and the head protection portion have a substantially symmetrical shape around a boundary portion. 3. The method according to claim 1, wherein the superimposition of the head protection portion on the trunk portion protection portion is a folding of the head protection portion toward the trunk portion protection portion. Item 2
A side airbag according to claim 1. 4. The apparatus according to claim 1, wherein the superimposition of the head protection part on the trunk protection part is a storage of the head protection part in the trunk protection part. A side airbag according to claim 1. 5. The side airbag according to claim 1, wherein the fuse sewn portion extends over the entire width or a part of the boundary portion. 6. The side according to claim 1, wherein a second fuse sewing portion is provided on the head protection portion so as to gradually expand the head protection portion. Airbag.