JPH0542001U - Air bag bag - Google Patents

Abstract

(57) [Abstract] [Purpose] When the bag body is inflated and abuts against the occupant and is pressed, the bag body is prevented from bottoming by obtaining sufficient internal pressure to counteract the pressing, and a good cushion Realize the function. The bag body 16 includes a front chamber 24 that communicates with the inflator 14 that generates a bag inflation gas, and a plurality of main chambers 25 and 2 that individually communicate with the front chamber 24 through an opening 34.
It is defined by 6 and 27. In the opening 34,
A cloth piece 38 is provided so that the opening 34 is opened only in one direction in which the gas flows into the main chambers 25, 26 and 27. In addition, in each of the main chambers 25, 26, 27, the gas is in the front chamber 2
4. Then, when the main chambers 25, 26, 27 flow into the main chambers and are inflated, they are arranged along the direction orthogonal to the direction facing the occupant.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bag body for an airbag device which is inflated to protect an occupant in an emergency of a vehicle.

[0002]

[Prior Art]

 As an airbag device, there is a device for a driver's seat or a device for a passenger's seat, in which the bag body is inflated toward the front of the occupant during sudden deceleration of the vehicle. Further, recently, there has been proposed an airbag device for a side impact which is installed inside a side door of a vehicle and inflates a bag body toward a side surface of an occupant.

[0003]

[Problems to be solved by the device]

 In an airbag device for a side collision, the distance between the installation position of the airbag device and the occupant is narrow, and the bag body has an inflated shape of a flat shape.

Therefore, as shown in FIG. 7, when the bag body 64 is locally pressed by the occupant 68, the gas in the direction shown by the arrow A in FIG. Escape from the pressed area to other areas. As described above, the gas pressure needs to be increased so that the internal pressure of the pressing portion becomes insufficient and the bag does not bottom.

In FIG. 7, reference numeral 66 denotes an inflator that generates gas for inflating the bag body.

In consideration of the above facts, the present invention prevents the bottoming by obtaining sufficient internal pressure against the pressing when the bag is inflated and abuts the occupant to press the bag. It is an object of the present invention to provide a bag body for an airbag device that achieves a good cushioning function.

[0007]

Means for Solving the Problems To achieve the above object, the present invention provides a front chamber that is inflated by being communicated with an inflator that operates in an emergency of a vehicle and generates a bag inflation gas, and a front chamber that is inflated. Each has an opening that is formed and communicates with the front chamber, and gas is introduced through each opening to inflate and, when inflated, are arranged side by side in a direction orthogonal to the direction facing the occupant. A plurality of main chambers and a non-return valve that is provided in the opening and operates by the pressure difference between the corresponding main chamber and the front chamber and allows the gas to flow into the corresponding main chambers by opening the opening only in one direction. The present invention proposes a bag body for an airbag device, which is provided with a valve.

[0008]

[Action]

 With the above configuration, when the inflator is activated during a vehicle emergency, the bag body inflating gas enters the front chamber. Then, due to the pressure of the gas, the front chamber is expanded, the check valves of the openings are opened, the gas is introduced into the main chambers, and the main chambers are also expanded.

As a result, the entire bag is inflated. When the bag body is inflated, that is, when the main chambers are inflated, the main chambers are arranged along the direction orthogonal to the occupant facing direction, and any of the main chambers can directly contact the occupant. When one of the main chambers comes into contact with the passenger and is pressed, the internal pressure of the one main chamber is increased. Due to this increase in internal pressure, the check valve is closed without opening, and the gas in one main chamber does not escape to the other main chamber and the front chamber.

Therefore, when the bag body is inflated and comes into contact with the occupant and the bag body is pressed, sufficient internal pressure against the pressing is obtained, bottoming is prevented, and a good cushion function is exhibited. R.

[0011]

【Example】

 An embodiment of the airbag device according to the present invention will be described in detail with reference to FIGS.

As shown in FIG. 2, the airbag device is arranged on the occupant side of the inner panel 12 of the side door 10 shown by a chain double-dashed line in the figure, and includes an inflator 14, a bag body 16 and a cover 18. ing.

The inflator 14 has a cylindrical shape, and a tip portion of the inflator 14 penetrates through the inner panel 12 in a manner of protruding toward the occupant, and is fixed to the inner panel 12 by a flange 20 formed on the inflator 14. The inflator 14 is operated by a sensor (not shown) to generate a high-pressure bag inflation gas. The sensor is installed in the side door 10 and detects a deformation of the side door 10 due to a rear-end collision and sends an output signal in a vehicle emergency in which another vehicle rear-ends into the side-door.

As shown in FIGS. 1 and 3, the bag body 16 has one front chamber 24 and three main chambers 25, 26, 27 with three partition walls 21, 22, 23 interposed therebetween. When the bag body 16 is inflated, it is divided into four chambers in total, and as shown in FIG. 5, along the vehicle front-rear direction orthogonal to the direction facing the side surface of the occupant, from the rear side to the front side in order. The chamber 24 and the main chambers 26, 26, 27 are arranged.

As shown in FIG. 1, a connection port 28 is formed in the front chamber 24, and as shown in FIG. 2, the protruding tip portion of the inflator 14 is inserted into the connection port 28 to connect the connection port 28. The bag body 16 is fixed to the inner panel 12 in a state where the peripheral edge of the bag is sandwiched between the ring plate 30 and the base plate 32.

Further, as shown in FIG. 3, the front chamber 24 faces the main chambers 25, 26, 27 at least through the partition wall 21 that partitions the front chamber 24. There is. That is, the two faraway main chambers 26, 27 of the three main chambers 25, 26, 27 are each bent into an L shape, and the main chamber 26 is located below the main chamber 25. A main chamber 27 extends to the main chamber 26 further below the chamber 26. Then, the partition wall 21 is formed with an opening 34 for respectively communicating the main chambers 25, 26, 27 and the front chamber 24 with each other, and the gas in the front chamber 24 passes through each opening 34. It is adapted to flow into each main chamber 25, 26, 27.

As shown in FIG. 4, each opening 34 is provided with a rectangular cloth piece 36 that constitutes a check valve. The cloth pieces 36 are positioned inside the main chambers 25, 26, 27, respectively, and the peripheral edge of the cloth piece 36 is sewn to the peripheral edge of the opening 34. When sewing, one end or the lower end of the cloth piece 36 is sewn. A stretchable suture thread 38 is used in the remaining portion except for, and an ordinary suture thread 37 is sutured at the one end. As a result, when the internal pressure of the front chamber 24 is higher than the internal pressure of the main chambers 25, 26, 27, the cloth piece 38 is pushed toward the inside of the main chambers 25, 26, 27, and the elasticity Sutured thread 38 extends. Then, the one end sewn with the normal suture thread 37 becomes a hinge portion, and the cloth piece 38 rotates, and a gap is formed between the peripheral edge of the opening 34 and the cloth piece 38, so that the opening 34 is formed. Is opened, and gas is introduced into the main chambers 25, 26, 27 through the gap. On the contrary, when the internal pressure of the main chambers 25, 26, 27 is higher than the internal pressure of the anterior chamber 24, the cloth piece 38 is pushed toward the partition wall 21 side, and the elastic suture thread 38 contracts to the original position. After returning, the opening 34 is closed. In this way, the cloth piece 38 is opened and closed based on the pressure difference between the internal pressures of the main chambers 25, 26 and 27 and the internal pressure of the front chamber 24, and the opening portion is opened only in one direction in which gas flows into the main chamber 26. 34 is designed to open. It should be noted that each opening 34 may be formed by a plurality of holes instead of one hole.

The cover 18 has a U-shaped cross section, which is composed of a developing portion that faces the bulging side of the bag body 16 and is composed of two developing pieces 42, and a skirt portion 40 that projects toward the base plate 32. Has been formed. The tip portion of the skirt portion 40 is fixed to the base plate 32, and the bag body 16 is folded and accommodated inside the cover 18. The fragile thin portion 44 of the deployable piece 42 is broken as the bag body 16 expands, so that the deployable piece 42 can be deployed in a double-door manner.

Next, the operation of this embodiment will be described. Normally, the bag body 16 is accommodated in the cover 16 at the side door 10 in a folded state.

When the inflator 14 is actuated at the time of a side collision, the bag inflation gas is introduced into the front chamber 24. Then, due to the pressure of the gas, the front chamber 24 is expanded, the cloth piece 38 is rotated to open the opening 34, and the gas in the front chamber 24 is flowed into the main chambers 25, 26, 27. Each main chamber 25, 26, 27 is expanded.

As a result, the entire bag body 16 is inflated. When the bag body 16 is inflated, that is, when the main chambers 25, 26, 27 and the front chamber 24 are inflated, the main chambers 25, 26, 27 and the front chamber 24 are along the direction orthogonal to the occupant facing direction. In parallel, each of the main chambers 25, 26, 27 and the front chamber 24 can directly contact the occupant.

For example, as shown in FIG. 5, when the occupant 50 abuts on one of the main chambers 25, 26, 27 and presses the main chamber 25, the main chamber 25 is pressed by the pressing. Even when the internal pressure rises, the cloth piece 38 is closed without opening, and the gas in the main chamber 25 does not escape to the other main chambers 26 and 27 and the front chamber 24.

Therefore, when the bag body 16 expands and comes into contact with the occupant 50 and the bag body 16 is pressed, sufficient internal pressure against the pressing is obtained, bottoming is prevented, and a good cushion function is provided. To be demonstrated.

The front chamber 24 need not be provided in parallel with the main chambers 25, 26, 27 or may be partitioned and positioned in other parts.

Further, in the above-mentioned embodiment, the disposing direction of each compartment when the bag body is inflated is the front-back direction of the vehicle, but as shown in the modified example of FIG. 6, it may be the up-down direction. After all, it may be arranged along the direction orthogonal to the direction facing the occupant.

Although the embodiments have been described above, the present invention is not limited to the above embodiments and various modifications can be made. For example, in the above-mentioned embodiment, the number of the branch chambers is four, but the number of the branch chambers is not limited to this, and may be any number.

Further, although the airbag device for side impact has been described, the invention is not limited thereto, and the distance between the installation position of the airbag device and the occupant position is narrow, and the dimension of the bag body in the inflation direction is small. It can be applied when the bag is restricted and the bag must be inflated in a flat shape.

[0028]

[Effect of the device]

 As described above, according to the airbag device bag of the present invention, when the bag is inflated and abuts the occupant to press the bag, the internal pressure against the pressing is sufficiently obtained. , Bottoming is prevented and good cushioning function is achieved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a bag body for an airbag device according to the present invention.

FIG. 2 is a vertical cross-sectional view of the airbag device using the bag body in FIG. 1 taken in a front chamber of the bag body before inflation.

3 is a sectional view taken along line 3-3 of FIG.

FIG. 4 is a perspective view of the check valve of the bag body in FIG. 1 viewed from the main chamber side.

5 is a view of the bag in FIG. 1 in an inflated state as seen from above.

FIG. 6 is a diagram of an inflated state of a bag body for an airbag device according to a modified example, as viewed from the rear side of an occupant.

FIG. 7 is a view in which an inflated state of a conventional airbag device bag is looked down from above.

[Explanation of symbols]

 14 inflator 16 bag 24 front chamber 25 main chamber 26 main chamber 27 main chamber 34 opening 36 cloth piece (check valve)

Continuation of the front page (72) Creator Minoru Miyagawa 1 Toyota-cho, Toyota-shi, Aichi Toyota Motor Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A front chamber that communicates with an inflator that generates gas for inflation of a bag when in an emergency of a vehicle and inflates, and an opening that is formed together with the front chamber and that communicates individually with the front chamber. A plurality of main chambers are provided in the openings and correspond to the plurality of main chambers that are arranged in parallel along the direction orthogonal to the direction facing the occupant when the gas is introduced through the openings and inflates and expands. A bag body for an airbag device, comprising: a check valve that operates by a pressure difference between a main chamber and a front chamber and opens a gas opening into a corresponding main chamber only in one direction.