JP2014008874A - Air bag device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air bag device for a vehicle capable of miniaturizing an air bag body and sufficiently securing a protective range for a passenger.SOLUTION: An air bag body 5 includes a generally mat-shaped bag body 15 that develops to be oriented to a passenger from a gas inflow part connected to an inflator 4, the first bag body 16 that branches upward from the leading end of the bag body 15 and is folded back so as to form a loop toward the inflow part, and the second bag body that branches downward from the leading end of the bag body 15 and is folded back so as to form a loop toward the inflow part.

Description

  The present invention relates to a vehicle airbag device that protects an occupant during a vehicle collision.

  In an airbag apparatus mounted on an automobile, it is required to reduce the size of the entire apparatus by reducing the capacity of the airbag body as much as possible. In order to meet such a demand, for example, in Patent Document 1, the flow of the inflation gas is regulated by a diffuser to stabilize the behavior of the airbag body in the vertical direction, and thus the capacity of the airbag body is increased. A structure to be suppressed is disclosed.

JP 2008-201211 A

  By the way, in the said conventional airbag apparatus, although the capacity | capacitance of an airbag main body can be made small, there exists room for improvement if it raises from a viewpoint of protecting a passenger | crew in a wider range. That is, there is a concern that the occupant receiving surface is reduced by the amount of the capacity of the airbag body and the occupant protection range is narrowed.

  The present invention has been made in view of the above-described conventional situation, and provides a vehicle airbag device that can sufficiently secure a protection range of an occupant while reducing the overall capacity of the device by reducing the capacity of the airbag body. The challenge is to do.

The present invention relates to a vehicle airbag device including an inflator that generates high-pressure gas at the time of a vehicle collision, and an airbag body that expands and develops into a predetermined shape when the high-pressure gas flows in.
The airbag main body has a substantially mat-shaped bag main body portion that expands toward a passenger from a gas inflow portion connected to the inflator, and branches upward from the front end portion of the bag main body portion and toward the inflow portion. A first bag body folded in a loop shape and a second bag body branched downward from the front end portion of the bag body portion and folded in a loop shape toward the inflow portion. It is characterized by having prepared.

  According to the airbag device of the present invention, the substantially mat-shaped first bag that expands upward from the substantially mat-shaped bag main body portion, that is, toward the head of the occupant and loops toward the inflow portion. Since the body and the second bag body having a substantially mat shape that extends in the downward direction, that is, toward the chest of the occupant and forms a loop shape toward the inflow portion, are provided, the first and second bags having the loop shape Since the body expands toward the occupant's head and chest, the receiving surface can be enlarged, and the protection range of the occupant can be sufficiently secured.

  Further, the capacity of the airbag main body can be reduced by the amount of the hollow portion formed by folding the first and second bag bodies into a loop shape, and the high-pressure gas output amount of the inflator can be suppressed accordingly, and thus The overall size of the airbag device can be reduced, and the weight and cost can be reduced.

  In the present invention, the first and second bag bodies are provided so as to be branched upward and downward from the front end portion of the bag body portion, so that the restraining load ratio to the occupant's head and chest is easily designed and evaluated. Therefore, it is possible to optimize the restraint performance at the time of a vehicle collision.

It is the schematic (II sectional view taken on the line of FIG. 2) which looked at the deployment state of the airbag apparatus of the motor vehicle by Example 1 of this invention from the vehicle side. It is a perspective view of the deployment state of the airbag main body of the said airbag apparatus. FIG. 3 is a cross-sectional front view of the airbag body in a deployed state (a cross-sectional view taken along line III-III in FIG. 2). It is the schematic of the storage state of the said airbag apparatus. It is a figure for demonstrating the manufacturing process of the said airbag main body. It is the schematic which looked at the deployment state of the airbag apparatus by Example 2 of this invention from the side. It is the schematic which looked at the deployment state of the airbag apparatus by Example 3 of this invention from the side.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  1 to 5 are views for explaining a vehicle airbag apparatus according to Embodiment 1 of the present invention.

  In the figure, reference numeral 1 denotes an airbag device mounted on an automobile. The airbag device 1 is disposed on the passenger seat side of an instrument panel 3 disposed below the windshield 2, and an inflator 4 that generates high-pressure gas in the event of a vehicle collision and the high-pressure gas flow in. An airbag body 5 that inflates and expands into a predetermined shape, and an ECU 6 that operates the inflator 4 when a detected value from an acceleration sensor, a vehicle speed sensor, or the like at the time of a vehicle collision exceeds a set value. Yes.

  The inflator 4 is disposed in a storage box 9 that opens upward, and an upper case 10 in which a large number of gas ejection holes 10a are formed, and a lower case in which a high-pressure gas generating agent (not shown) is loaded. 11 has a structure in which the flange portions 12 and 12 are coupled to each other.

  The storage box 9 is housed in an opening 3a formed in the instrument panel 3, and is flanged to the peripheral edge of the opening 3a. In addition, a lid 14 that is opened by the inflation and deployment pressure of the airbag body 5 is disposed in the opening 3a.

  The airbag body 5 is stored in a folded state in the storage box 9, and when the inflator 4 is energized, the high-pressure gas generating agent is ignited, and the high-pressure gas generated thereby inflates and deploys into a predetermined shape. Specifically, it has the following structure.

  The airbag body 5 branches from a gas inflow portion 15a connected to the inflator 4 so as to be directed toward the occupant, and to a bag body portion 15 having a substantially rectangular mat shape, and upward from a distal end portion 15b of the bag body portion 15. The first bag body 16 having a substantially rectangular mat shape that expands toward the head of the occupant, and the substantially rectangular shape that expands downward from the distal end portion 15b of the bag main body portion 15 and extends toward the occupant's chest. And a mat-shaped second bag body 17. Here, the rectangular mat shape is formed by overlaying two base fabrics having a square shape, a rectangular shape, or a trapezoidal shape, and stitching the side edges of the base fabric. A bag body whose length is substantially constant.

  The gas inflow portion 15 a of the bag main body portion 15 has a gas inflow port 15 c, and the peripheral portion of the inflow port 15 c is airtightly sandwiched between the flange portions 12, 12 of the inflator 4.

  The bag body portion 15 and the first bag body 16 are integrally formed, and the second bag body 17 is formed separately from the bag body portion 15 and the first bag body 16. The second bag body 17 is integrally formed with a gas introduction portion 17a joined to the lower surface of the bag main body portion 15 so that the gas introduction portion 17a and the bag main body portion 15 are connected to each other. The plurality of gas communication holes 18 formed communicate with each other.

  The high-pressure gas generated by the inflator 4 (see the arrow in FIG. 1) flows into the bag main body 15 and flows into the first bag body 16, and from the bag main body 15 through the gas communication hole 18 to the gas introduction portion. It flows into 17a and flows into the second bag body 17.

  The first and second bag bodies 16 and 17 are folded back so as to form a loop shape upward and downward from the distal end portion 15b of the bag main body portion 15 toward the gas inflow portion 15a.

  The folded end portions 16 b and 17 b of the first and second bag bodies 16 and 17 are coupled to the bag main body portion 15. Thereby, the loop portions 16c and 17c of the first and second bag bodies 16 and 17 have the hollow portions 20 penetrating in the vehicle width direction, respectively. The capacity of the first and second bag bodies 16 and 17 is reduced by the empty part 20.

  A vent hole 16 d that opens upward toward the windshield 2 is formed in the loop portion 16 c of the first bag body 16. A vent hole 17d is formed in the loop portion 17c of the second bag body 17 so as to open upward into the cavity portion 20.

  The vent holes 16d and 17d discharge the gas in the first and second bag bodies 16 and 17 to the outside when the occupant hits the deployed airbag body 5, thereby acting on the occupant. Absorbs impact energy.

  Here, as shown in FIG. 5, the bag body portion 15 and the first bag body 16 are formed of two rectangles corresponding to the developed shapes of the bag body portion 15 and the first bag body 16 from the long woven fabric 25. The base fabrics 26 and 27 having a shape are cut, the base fabrics 26 and 27 are overlapped, and the side edges are stitched in an airtight manner. The second bag 17 is also manufactured by the same method as described above.

  According to the present embodiment, the substantially rectangular mat-shaped first bag body 16 that extends from the substantially rectangular mat-shaped bag main body portion 15 connected to the inflator 4 toward the occupant's head and the occupant's chest is directed. Since the second bag body 17 that is deployed so as to be folded in a loop shape upward and downward, the first and second bag bodies 16 and 17 are deployed toward the occupant's head and chest, respectively. Thus, the receiving surface can be enlarged, and a sufficient protection range for the passenger can be secured. In this case, since the receiving surfaces of the first and second bag bodies 16 and 17 are the loop portions 16c and 17c having the cavity portion 20, the impact load absorption efficiency can be increased.

  In addition, since the first and second bag bodies 16 and 17 are deployed on the occupant's head and chest, respectively, the airbag body 5 does not cling to and squeeze the occupant's neck, reducing the burden on the neck. it can. Further, since the occupant is received by the two first and second bag bodies 16 and 17 having high rigidity, the restraining force of the occupant can be increased, and the influence on the occupant can be more reliably suppressed.

  In the present embodiment, the capacity of the airbag main body can be reduced by the amount of each cavity 20 formed by the first and second bag bodies 16 and 17, and the high-pressure gas output amount of the inflator 4 can be suppressed accordingly. As a result, the overall size of the airbag device can be reduced, and the weight and cost can be reduced.

  In the present embodiment, the first and second bag bodies 16 and 17 are provided so as to be branched upward and downward from the front end portion 15b of the bag main body portion 15, so that the restraining load ratio to the occupant's head and chest is designed / designed. It is possible to easily adjust at the evaluation stage, and it is possible to optimize the restraint performance at the time of vehicle collision.

  In this embodiment, the bag main body portion 15 and the gas introduction portion 17a of the second bag body 17 are overlapped and joined, so that the overlap portion is quickly deployed by being deployed between the head and the chest of the occupant. Development is possible.

  Further, since the overlapping portion serves as a columnar base portion, it is possible to receive an impact load alone or only by the instrument panel 3, and the capacity of the airbag main body can be reduced from this point. That is, the conventional general airbag body receives an impact load by being brought into contact with the windshield and the instrument panel, and there is a problem that the airbag capacity becomes larger than necessary.

  In this embodiment, since the vent holes 16d and 17d are provided so as to open upward, the entire airbag moves downward due to the reaction caused by the high-pressure gas flowing out from the vent holes 16d and 17d. The airbag main body 5 can be deployed without relying on the reception of 2.

  In this embodiment, the airbag main body 5 is composed of the bag main body portion 15 and the first and second bag bodies 16 and 17 branched from the bag main body portion 15, so that the R at the left and right corner portions is reduced. Therefore, even when the occupant is displaced to the left or right at the time of a vehicle collision, it can be restrained reliably.

  Furthermore, in this embodiment, since the two rectangular base fabrics 26 and 27 corresponding to the deployed shape of the airbag body are cut from the long woven fabric 25, the product yield can be improved and the material cost can be reduced accordingly. . In addition, since sewing is also performed on a flat surface, the operation is facilitated, and the processing cost can be reduced in this respect. That is, the conventional general airbag body may be formed so as to have a substantially conical shape when deployed. In this case, as shown by a two-dot chain line in FIG. Yield deteriorates due to different sizes.

  In the above-described embodiment, the case where the airbag device is provided on the passenger seat side of the instrument panel has been described. However, the airbag device of the present invention may be provided on the vehicle body ceiling, and in this case, a side collision occurs. Sometimes the airbag body is deployed between the vehicle body side and the occupant.

  6 and 7 are diagrams for explaining an airbag apparatus according to the second and third embodiments of the present invention, respectively. In the figure, the same reference numerals as those in FIG. 1 denote the same or corresponding parts.

  The airbag body 5 shown in FIG. 6 has a structure in which first and second bag bodies 16 and 17 that are separately formed are connected to a distal end portion 15b of a bag body portion 15 that is independently formed.

  In such a case, the cavity 20 of the second bag body 17 can be made larger than in the first embodiment, the capacity of the airbag body can be further reduced, and the manufacturing is facilitated. As a result, the manufacturing cost can be reduced.

  The airbag main body 5 shown in FIG. 7 is configured by dividing the bag main body portion 15 in the axial direction into two half main body portions 15 ′ and 15 ″, and superimposing and connecting the two half main body portions 15 ′. ′, 15 ″ are connected to the inflator 4, and the first and second bag bodies 16, 17 are formed integrally with the half body portions 15 ′, 15 ″, respectively. In this case, the high-pressure gas flows into the half body portions 15 ′ and 15 ″ and flows into the first and second bag bodies 16 and 17, respectively. And the manufacturing cost can be reduced.

DESCRIPTION OF SYMBOLS 1 Airbag apparatus 4 Inflator 5 Airbag main body 15 Bag main-body part 15a Gas inflow part 15b Tip part 16 1st bag body 17 2nd bag body

Claims (1)

In a vehicle airbag apparatus comprising an inflator that generates high-pressure gas at the time of a vehicle collision, and an airbag body that expands and develops into a predetermined shape when the high-pressure gas flows in,
The airbag main body is a substantially mat-shaped bag main body that is deployed so as to be directed to a passenger from a gas inflow portion connected to the inflator,
A first bag body branched upward from the tip of the bag body and folded back to form a loop toward the inflow portion;
A vehicular airbag apparatus comprising: a second bag body that branches downward from the front end portion of the bag main body portion and is folded back so as to form a loop toward the inflow portion.

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