JPH05246296A - Air bag device - Google Patents

Abstract

PURPOSE:To provide an air bag device for providing sufficient spread and inflation even with a low gas injection supply amount. CONSTITUTION:There are comprised a car body constituent member 5 having an air introduction port 6, a bag-shaped air bag body 10 having an opening 10b and its opening end part 10a surrounding tire in-chamber R side of the air introduction port. and a gas generator 17 for forcibly feeding gas C into the air bag body to inflate the body. The air bag body comprises a double structure 11, art inside sheet 14 and an outside street 13. Its opening end part is formed with a gas introduction port 15 communicating with the gas generator. The air introduction port is interposed with a unidirectional valve 8 closed in normal condition to move no air A and opened by inflating the body 10 to apply negative pressure to inner space S.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag device used in aircraft, trains, ships, automobiles and the like.

[0002]

2. Description of the Related Art Conventional air bag devices include, for example, a device known from Japanese Patent Laid-Open No. 62-139740 and a device shown in FIG. A gas generator 2 is provided inside the instrument panel 1, and an opening end portion 3a of an airbag 3 having a bag shape is attached to a peripheral portion of the gas generator 2. The airbag 3 is normally stored inside the instrument panel 1 in a folded state, but when a vehicle collides, a large amount of gas G is generated from the gas generator 2 by a collision signal from a collision sensor.
Is injected and supplied from the opening end 3a into the airbag 3, so that the airbag 3 is instantly deployed and inflated toward the room R side, and the occupant is inflated in this inflated state. It is designed to be able to reliably catch M's forward fall.

[0003]

However, in such a conventional technique, if the gas G is not supplied to the full internal volume of the airbag 3, the airbag 3 will not be sufficiently inflated and inflated. The generator 2 must be equipped with a large amount of gas generating agent commensurate with it, which is extremely disadvantageous in terms of weight and cost.

The present invention has been made by paying attention to such a conventional technique, and provides an airbag device capable of obtaining a necessary and sufficient expanded / inflated state of the airbag even with a small gas amount.

[0005]

In order to achieve the above-mentioned object, an airbag device according to the present invention is formed into a bag-like body having an opening, and a body-constituting member having an opening. And an airbag main body whose end portion forming a portion surrounds the indoor side of the air introduction port of the vehicle body constituent member, and a collision signal can inflate gas into the airbag main body to inflate the airbag main body. The airbag body has a double structure of an inner sheet and an outer sheet, and a part of an opening end portion of the airbag body communicates with the gas generator between the inner sheet and the outer sheet. The air inlet is formed so as to prevent the air from moving from the opening side of the airbag body at all times, and the inside of the airbag body and the outside of the airbag body are closed. Gas is introduced between the seat and the seat by the gas generator, and the inner space of the airbag main body is negatively pressured as the airbag main body expands. A one-way valve is provided which opens only when a force for inhaling is generated.

[0006]

The gas emitted from the gas generator is jetted and supplied from the gas inlet into the space between the outer sheet and the inner sheet of the airbag body to expand and inflate the airbag body. In this way, the airbag body itself is in a standing state by receiving a gas pressure and a strong pressure between the outer sheet and the inner sheet, and is forced to deploy and inflate. Then, due to the expansion, the inside of the airbag main body becomes negative pressure.

Therefore, as the airbag body is expanded and inflated, the air inlet surrounded by the open end of the airbag body is closed, and the one valve is moved into the internal space to open the air inlet. Air is sucked and supplied into the internal space of the airbag body, and the inside of the airbag body is filled with air.

[0008] Even if the occupant who has fallen forward hits strongly against the airbag body that has been inflated and inflated by being filled with air as described above, the air in the airbag body is provided at the air inlet port. Since it is enclosed by the one-way valve, the air stays in the internal space of the airbag body, and the cushioning property necessary for protecting the occupant can be reliably obtained.

As described above, since the gas is eventually injected and supplied enough to fill the space between the outer sheet and the inner sheet of the airbag body, the gas generating device may be provided with only the gas generating agent. Good. Therefore, the function of protecting the occupant is not impaired at all, and it is not necessary to equip the gas generator with a large amount of gas generating agent as in the conventional case, which is advantageous in terms of weight and cost.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to FIGS. It should be noted that the description overlapping with the conventional one is omitted.

First, the structure of the airbag body 10 will be described with reference to FIGS. 3 and 4. The airbag body 10 has a rectangular center portion 11 that forms an upper surface, a front surface, and a lower surface of the airbag body 10, and has a trapezoidal shape that forms left and right side surfaces of the airbag body 10. It consists of the side part 12. As described above, only the center portion 11 has a double structure including the outer sheet 13 and the inner sheet 14 [hatched portion in FIG. 4]. The center portion 11 and the side portion 12 are sewn together at the sewing portion 16, and the corresponding edges 11a of the both are
The airbag body 10 is formed by stitching 12a to each other.
Is finished in a three-dimensional bag shape.

Since both edges of the center portion 11 are sewn by the corresponding edges 11a, 12a and the sewing portion 16, no matter how much gas G is injected and supplied into the center portion 11, It is designed to inflate only up to a certain bulge limit L (see FIG. 1).

The upper and lower edges 11c and 11d of the center portion 11 which is finished in a three-dimensional bag shape and the side portions 1 are formed.
The ends 10a of the airbag body 10 are formed by the four sides of the left and right edges 12b, 12b of the reference numerals 2, 12.

Upper and lower end edges 11 constituting the end portion 10a
Of the c and 11d, the edge 11c located on the lower side is entirely sewn, but the edge 11d located on the upper side leaves only the central portion as an unsewn portion, That is the gas inlet 15.

On the other hand, a fixed bracket 5 as a "body component" is provided inside the instrument panel 4, and an air inlet 6 is provided at the center of the fixed bracket 5.
The air inlet 6 is provided with a one-way valve 8 rotatably supported by a hinge 7 on the room R side. Further, a mounting portion 9 is set around the fixing bracket 5 except for a portion corresponding to the gas introduction port 15 in the end portion 10a of the opening 10b of the airbag body 10. An end portion 10a of the airbag body 10 is fixed in a state of surrounding the air introduction port 6.

A gas generator 17 including a small gas generator 17a and a gas outlet 17b is provided above the mounting portion 9 of the fixed bracket 5. The gas outlet 17b is connected to the gas inlet 15 of the airbag body 10. Then, at the time of a vehicle collision, a predetermined amount of gas G can be injected and supplied from the gas generator 17a into the center portion 11 by using a collision signal from a collision sensor as a trigger.

Next, the operation of the airbag device when in use will be described. The airbag main body 10 is normally stored in a folded state on the surface of the fixed bracket 5 inside the instrument panel 4 on the side of the room R, but in the event of a vehicle collision, a signal from a sensor (not shown) is received. , The gas generating agent in the gas generator 17a is ignited, and a large amount of gas G
Is injected from the gas inlet 15 through the gas outlet 17b and is supplied into the center portion 11, so that it begins to expand and expand toward the room R side.

That is, when the gas G is injected and supplied from the gas introduction port 15 into the center portion 11 of the airbag body 10, the center portion 11 begins to expand and inflate, but when the center portion 11 expands and inflate. As a result, the side portion 12 is also pulled by it to cause the side portion 12 to expand and inflate, and as a result, the entire airbag body 10 is forcibly expanded and inflated.

As described above, the internal space S of the airbag body 10 in which the forced expansion and expansion is forced by the center portion 11 which expands and expands vigorously under the gas pressure, in the expansion and expansion process. Since a negative pressure is inevitably generated, an amount of air A commensurate with the internal space S of the airbag body 10 is sucked and supplied from the air inlet 6, and the internal space S of the airbag body 10 is filled with air A. Becomes Therefore, the negative pressure in the internal space S of the airbag body 10 is eliminated, and the necessary and sufficient expansion and inflation of the airbag body 10 are achieved.

When the airbag body 10 in the inflated and inflated state as described above receives the forward tilt of the occupant M, the airbag body 10 is pushed by the occupant M.
Although the pressure in the internal space S increases, the air introduction port 6 is provided with the one-way valve 8 for restricting the discharge of the air A, so that the air A remains in the airbag body 10 and the occupant M
The cushioning property required for the protection of is surely obtained.

FIG. 5 is a view showing an airbag body 18 according to another embodiment of the present invention. In this embodiment, the side portion 19 and the front surface corresponding portion 20 of the airbag body 18 are formed into a double structure portion 21 of the outer sheet 13 and the inner sheet 14 [hatched portion in the figure]. The gas inlet 22 is provided in a part of the end portion 18a of the airbag body 18.

FIG. 6 is a view showing an airbag body 23 according to still another embodiment of the present invention. In this embodiment, only the corner portion of the airbag body 23 is provided with the double structure portion 24.
The shaded area is shown in the figure. The gas inlet 25 is provided in a part of the end 23a of the airbag body 23.

In the above description, a part of the airbag body 10, 18, 23 is referred to as the jacket portion 11, 21, 2.
However, the entire airbag body may be a "double structure portion". The point is that the "double structure part" can be any part that is involved in the expansion and inflation of the airbag body (effective portion), and the most suitable one can be selected depending on the shape and folding method of the airbag body. Just do it.

In addition, although the one-way valve 8 has a flat plate shape as an example, a known valve structure such as a ball valve may be adopted.

[0025]

The airbag device according to the present invention has the contents described above, and it is necessary and sufficient for the airbag body to inject the gas only into the double structure portion of the airbag body. Therefore, the gas generator need only be provided with a gas generating agent sufficient to generate a sufficient amount of gas to fill the double structure.
Therefore, it is not necessary to equip the gas generator with a large amount of gas generating agent as in the conventional case, which is very advantageous in terms of weight and cost.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an expanded and inflated state of an airbag device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view corresponding to FIG. 1 showing a state in which an occupant has fallen forward.

FIG. 3 is a development view of a partial cross section showing the structure of the airbag body.

FIG. 4 is an overall perspective view showing an airbag body in a deployed / inflated state.

FIG. 5 is an overall perspective view showing another embodiment of the airbag body.

FIG. 6 is an overall perspective view showing still another embodiment of the airbag body.

FIG. 7 is a side view of a room showing a conventional airbag device.

[Explanation of symbols]

 4 Instrument Panel 5 Fixed Bracket (Car Body Component) 6 Air Inlet 8 One-way Valve 10, 18, 23 Airbag Main Body 10a, 18a, 23a End 10b Opening 11, 21, 24 Double Structure 13 Outer Seat 14 Inside Seat 15 Gas inlet 17 Gas generator S Internal space of airbag body G Gas A Air R Indoor

Claims (1)

[Claims] 1. A vehicle body constituting member having an air introduction port, and a bag-like member having an opening, and an end portion forming the opening surrounds an inner side of the air introducing port of the vehicle body constituting member. And a gas generator capable of inflating the airbag body by pumping gas into the airbag body in response to a collision signal. The airbag body is a double sheet including an inner sheet and an outer sheet. And a gas introducing port communicating with the gas generating device between an inner sheet and an outer sheet at a part of the opening end of the air bag body. The air inlet is closed so that the air does not move from the opening side of the air bag body, and the gas is introduced between the inner sheet and the outer sheet of the air bag body by the gas generator to A one-way valve that is opened only when a force for sucking air into the internal space from the outside of the vehicle body component is generated due to the negative pressure in the internal space of the airbag body caused by the expansion is provided. An airbag device characterized in that