JPH09202201A - Air bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive air bag having simple structure, sufficient pressure strength against peeling from the body members of strap members, and greatly enhanced the yield in cutting from a material for air bag. SOLUTION: A circular car body side body member 3 in which an opening 10 for inflator is punched and provided at the center part and reinforcing members 4, 5 are joined to a peripheral edge part is joined to an occupant side body member 2 to form a bag shape. A pair of car body side strap members 7 having radial straps 7A-7C, 6A-6C are joined and secured to an occupant side strap member 6 at respective center parts. corresponding straps are connected 13 together. At least one central part is joined to the body member 2 corresponded at the joined side 14H of a generally polygon (for example, a hexagon) having the number of angles, the integral multiplies of the straps 6A-6C of the strap member 6. Each strap 6A-6C is located at the position of the joined side 14H.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has an internal strap member attached to a steering wheel, a passenger seat or the like for protecting an occupant of an automobile or the like, and having an internal strap member excellent in pressure resistance when inflated. The present invention relates to an airbag that is advantageous in cutting.

[0002]

2. Description of the Related Art In recent years, an increasing number of automobiles have adopted an airbag for steering wheel protection, a passenger seat or the like for protecting an occupant, and many types of airbags have been proposed. An example of such a device is shown in Japanese Patent Application Laid-Open No. 5-301553 shown in FIG. Explaining this, as shown in FIG. 7 (A), the airbag 21 is composed of a top portion (passenger side main body member) 22 and a base portion (vehicle body side main body member) 23. Joined to form a bag.
In the bag-shaped airbag 21, a pair of strap members 26, 27 are provided with straps 26A-D, 27A-.
It is connected and installed by each connection end part 33 of D. Further, the strap member 27 is sewn together with the reinforcing members 24 and 25 arranged at the periphery of the inflator opening 30 to the vehicle body-side main body member 23 by a sewn portion 36 as a circular joint, and the strap member 26 is attached to each of these strap members. Similarly, together with the reinforcing member 28, the circular sewn portion is sewn to the occupant side body member 22.

The strap members 26 and 27 are provided to prevent excessive expansion toward the occupant due to the gas ejected from an inflator (not shown) at the initial stage of inflation of the airbag, and thereby the initial stage of inflation of the airbag. The occupant can be protected reliably and safely by preventing the expansion of the vehicle in the vertical and horizontal directions from being delayed. In addition to the airbag having such a strap member, JP-A-5-270337, JP-A-5-319191,
There are those described in Japanese Patent Publication No. 6-51459, etc. FIG. 7C shows a state in which the airbag 21 is turned upside down to install the strap members 26 and 27. The strap members 26 and 27 have four belt-shaped straps 26A to D and 27A to D, respectively. Is formed, and the straps are connected to each other at the connection end 33.
Then, in order to obtain these strap members 26 and 27, as shown in FIG. 7 (B), they are arranged in the cut shape of these strap members on the airbag material 35,
Cutting is performed at a yield that is as lean as possible.

[0004]

However, since the strap member has a band-shaped strap whose cutting shape is a radial shape, it is difficult to cut a fabric material for an airbag with good yield, and loss of the airbag material. The rate is still large, even if you try to combine the body member and the strap member and the reinforcing member of any conventional shape, the cutting method of the dramatic yield can not be obtained, there are still many loss parts to be discarded after cutting, The cost was increased by wasting expensive airbag materials. On the other hand, by the force from the occupant side body member and the vehicle body side body member which are separated from each other when the airbag is inflated, each strap of the strap member tries to peel off the circular suture portion in the central portion of the strap member, In such a conventional strap member, since the joint portion of the central portion of the strap body member such as the suture to the airbag body member forms the circular suture portion as described above, the strap first acts on the circular suture portion. What is required is a point contact portion, and a strong peeling force is applied. As a result, sufficient pressure resistance against peeling of the strap member from the main body member cannot be obtained.

The present invention solves the problems associated with the conventional air bag having a strap member inside as described above, and has sufficient pressure resistance against peeling of the strap member from the main body member. The yield at the time of cutting the strap material etc. from the bag material has been dramatically improved.
Provide a low cost airbag with a simple structure.

[0006]

Therefore, according to the present invention, a circular body-side main body member having an opening for an inflator formed in the center and a reinforcing member joined to the peripheral portion of the opening for the inflator, and a circular occupant. An airbag formed by joining with a side main body member to form a bag, wherein a pair of vehicle body side strap members and occupant side strap members having radial straps on the vehicle body side main body members and the occupant side main body members are respectively provided. In the airbag in which the central portions are joined and fixed and the corresponding straps of these strap members are connected to each other, at least one central portion of the pair of strap members has an integral multiple of the number of straps of the strap member. The straps are joined to the corresponding main body members at the joining sides of the polygonal shape of the number of angles, and the straps are arranged at the positions of the joining sides. Was that characterized in, it is an unit for which a problem solution. Further, according to the present invention, the cutting shape between the adjacent straps of the radial straps in each of the strap members is formed in an arc shape having a curvature substantially equal to the cutting shapes of the vehicle body side body member and the occupant side body member. And these are used as means for solving the problems.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention. As shown in FIG. 1 (A), an airbag 1 is composed of an occupant side main body member 2 and a vehicle body side main body member 3, and their peripheral edges are joined together. Are joined together to form a bag,
In this bag-shaped airbag 1, straps 6A, 6B, 6C and 7 extending radially at an angle of 120 ° to each other.
A pair of strap members 6 and 7 respectively having A, 7B, and 7C are installed with each strap being connected by each connecting end 13. Further, as shown in FIGS. 1B and 1C, which are B and C arrow views of FIG. 1A, the central portion of the strap member 7 is arranged at the peripheral edge of the inflator opening 10. A sewn portion 1 as a circular joint portion in the substantially central portion of the vehicle body-side main body member 3 together with two or three layers of reinforcing members 4 and 5.
6 etc. are joined. On the other hand, the central portion of the strap member 6 is sewn to the occupant-side body member 2 by the polygonal sewn portion 14. Specifically, for example, the number of corners that is an integer multiple of the number of the three straps 6A, 6B, and 6C of the strap member 6 is, for example, approximately 6.
The straps 6A, 6B, and 6C are joined to the corresponding body members 2 at the rectangular joining sides 14H, and the straps 6A, 6B, and 6C are arranged at the joining sides 14H.

Further, vent openings 11 and 12 for exhausting gas from the airbag 1 are formed on both sides of the inflator opening 10 of the vehicle body member 3, and the reinforcing member 8 is also provided in each of the vent openings. , 9 are joined together by stitching or the like. As described above, the three radial straps 6A to
As shown in FIG. 3, the airbag 1 having the strap members 6 and 7 having 6C and 7A to 7C has radial straps 6A, 6B and 6 of the strap members 6 and 7, respectively.
The cutting shape between the straps C and 7A, 7B, 7C that are adjacent to each other is formed in an arc shape having a curvature S that is substantially equal to the cutting shapes of the vehicle body side body member 3 and the passenger side body member 2. In addition, 8 and 9 in FIG. 3 indicate the cutting positions of the reinforcing member for the vent opening.

With the above structure, the strap member 6,
In order to cut the member pieces such as the reinforcing members 4, 5 and 8, 9 including the air bag material 15 from the air bag material 15, the vehicle body side body member 3 arranged in a zigzag manner at predetermined intervals in the air bag material 15. It is possible to cut the reinforcing members 4, 5, 8, 9 and the strap members 6, 7 between the passenger body member 2 and the occupant-side body member 2 without excess or deficiency. Pieces can be cut. Particularly, regarding the strap members 6 and 7 arranged between the vehicle body-side body member 3 and the occupant-side body member 2, the shape between the straps adjacent to each other is the vehicle body-side body member 3 described above.
And a curvature S that is almost equal to the cut shape of the passenger side body member 2.
Are formed in a circular arc shape, their structures are simple, and there is no gap between the vehicle body side body member 3 and the passenger side body member 2 and there is no room for waste. Thus, the yield at the time of cutting from the airbag material is dramatically improved, and an airbag with a simple structure and low cost is provided.

The strap members 6 and 7 are provided with openings 10 for the inflator at the initial stage of inflation of the airbag 1.
The excessive expansion in the occupant direction due to the gas ejected from the inflator inserted and installed from the inflator is regulated, thereby preventing the delay in the vertical (vertical) and the lateral expansion in the initial stage of the inflation of the airbag 1, to ensure the The passengers can be protected safely. In addition, at least the central portion of the strap member 6 is joined to the occupant-side body member 2 by, for example, a substantially hexagonal joint side 14H that is an integral multiple of the number of the three straps 6A, 6B, 6C of the strap member 6. ,
The straps 6A, 6B and 6C are connected to the joint side 14H.
The strap members 6A, 6B, 6C of the strap member 6 are separated from each other by the forces from the passenger side main body member 2 and the vehicle body side main body member 3 which are separated from each other when the airbag 1 is inflated. Even if an attempt is made to peel off the stitched portion of the substantially hexagonal joint side 14H in the central portion of 6, the peeling force from each strap 6A, 6B, 6C is borne by all the sides of the joint side 14H, so that a circular shape from the strap is used. Compared with the conventional one in which a strong peeling force acts on the sewn portion by point contact, the pressure resistance is significantly improved.

FIG. 2 shows a second embodiment of the present invention. In the first embodiment, the strap member 6 on the occupant side is the hexagonal joint side 14H at the central portion.
In the second embodiment, the body side body member 3 and the strap member 7 are joined to each other at the central portion thereof by the substantially hexagonal joint side 16H.
Is joined together with the reinforcing members 4 and 5 for the inflator opening. It goes without saying that the straps 7A, 7B, 7C of the strap member 7 are arranged at the positions of the substantially hexagonal joint side 14H.
The reinforcing members 4 and 5 for the opening for the inflator may be circular, or may be substantially hexagonal in conformity with the substantially hexagonal stitching portion 16. In the present embodiment, the body member 2 and the strap member 6 on the occupant side are joined by the circular stitching portion 14. As a result, on the vehicle body side, similarly to the first embodiment, the pressure resistance is significantly improved.

In the first and second embodiments, the central portion of the strap member on at least one of the occupant side and the vehicle body side has a substantially hexagonal stitching portion with respect to the corresponding main body member. However, the central portion of each strap member is joined to the corresponding main body member at the joint side of the polygonal member having an angle number that is an integral multiple of the number of straps of the strap member on both the occupant side and the vehicle body side. At the same time, each of the straps may be arranged at the position of the joining side, which can further improve the pressure resistance against the peeling of the strap member from the body member on both the occupant side and the vehicle body side. .

FIG. 4 shows a third embodiment of the present invention. In contrast to the case where three radial straps are arranged in the strap member of each of the embodiments described above, In the third embodiment, the radial straps of the strap member have four straps that are orthogonal to each other. On the occupant side, the strap member 6 has a central portion corresponding to the occupant side main body corresponding to a joint side 14H of, for example, an approximately octagon having an angle number that is an integral multiple of the number of four straps 6A, 6B, 6C, and 6D orthogonal to each other. Member 2
And the straps 6A, 6B,
6C and 6D are arranged at the position of the joint side 14H. On the vehicle body side, the strap member 7 having the four straps 6A, 6B, 6C and 6D which are orthogonal to each other has a sewn portion 16 having a circular center portion at the center portion thereof.
Joined to. Vent openings 11, 12 for discharging gas from the airbag 1 are provided on both sides of the inflator opening 10.
And the reinforcing members 8 and 9 are also joined to the respective vent openings by stitching or the like.

A strap member 6 having four radial straps 6A-6D, 7A-7D as described above,
7, the airbag 1 having the occupant-side main body member 2 and the vehicle body-side main body member 3 installed therein is, as shown in FIG. 5, each strap member 6 (the strap member 6 is formed of divided pieces 6-1 and 6-2. .), 7 with radial straps 6A, 6
B, 6C, 6D and 7A, 7B, 7C, 7D are formed in an arc shape having a curvature S'which is substantially equal to the cut shapes of the body side body member 3 and the passenger side body member 2 between adjacent straps. And the occupant side body member 2 are cut from the airbag material in a cut shape.
Also, it is possible to cut the above-mentioned members in a form in which they are arranged between the strap members 6 and 7 without excess or deficiency, and it is possible to cut these member pieces with extremely high yield. The reinforcing members for the inflator opening and the vent opening are cut from a separate airbag material. Although not shown, the strap member 7 has four straps 7A, 7B, 7 whose center portions are orthogonal to each other.
It may be configured to be joined to the corresponding vehicle body side body member 3 at a joining side of, for example, an approximately octagonal shape having an angle number that is an integer multiple of the numbers of C and 7D. The central portion of the strap member having the four orthogonal straps 7A, 7B, 7C, 7D may be configured to be joined to the corresponding main body member at the joining side of the substantially octagon.

With the above configuration, in the present embodiment,
The airbag is formed by cutting the four radial straps adjacent to each other in an arc shape having a curvature S'which is substantially equal to the cutting shapes of the vehicle body side body member 3 and the passenger side body member 2. These members are cut from the material for use, and are cut in a form in which the above-mentioned members are arranged between the vehicle body-side main member 3 and the occupant-side main member 2 and the strap members 6 and 7 without excess or deficiency. The occupant-side main body member 2 which can cut the pieces and separates from each other when the airbag 1 is inflated by installing a strap member in which four straps are radially arranged.
And the force from the vehicle-body-side main body member 3 causes the straps 6A, 6B, 6C, and 6D of the strap member 6 to join the substantially octagonal joint side 14H at the central portion of the strap member 6.
Even if an attempt is made to peel off the sutured portion, the peeling force from the strap, which is divided by the four straps and becomes smaller, is carried by all the sides of the joining side 14H, and the pressure resistance is further improved. became.

Table 1 shows the pressure resistance test data by the expansion simulator comparing the embodiment according to the present invention with the conventional comparative example. A is a conventional comparative example, in which the strap members are circular on both the occupant side and the vehicle body side. What is joined by a sewn portion, B is a first embodiment corresponding to FIG. 1, and C is a second embodiment corresponding to FIG. All of A to C were formed using the same airbag material, and a practical inflation pressure was applied to the inside of the airbag to obtain the breaking time and the compressive strength at that time as shown in the table. According to this, it can be seen that the breaking strengths of Examples B and C were substantially the same as those of Comparative Example A, but the compressive strength was significantly improved. Therefore, due to the presence of the strap member whose pressure resistance is significantly improved, excessive expansion of the airbag toward the occupant due to excessive and sudden ejection gas from the inflator at the initial stage of inflation is restricted, and the airbag is vertically and horizontally extended. It is possible to reliably prevent a delay in the expansion of the vehicle, and reliably and safely protect the occupant.

Although the airbag according to the embodiment of the present invention has been described above in detail, the airbag device using the airbag is arranged not only on the steering wheel and the passenger seat but also on the door, the rear seat and the like. It is also adopted in the airbag device, and within the scope of the present invention,
The width and material of the airbag, that is, the material for the airbag, the shape of the airbag body member, the joining form (sewn, fused, bonded, etc.) between the passenger side body member and the vehicle body side body member, the number of reinforcing members,
Shape, connection form between a pair of strap members (the joining side of the polygonal stitched portion and the connection end part of the straps of the strap member may be parallel to each other, or may have another suitable arrangement relationship) It goes without saying that the structure relating to the joining of the reinforcing member with the airbag body member, the arrangement of the inflator opening, the mounting hole or the vent opening, and the combined structure thereof can be appropriately adopted.

[0018]

As described above in detail, according to the present invention, at least the central portion of the strap member is on the occupant side main body member, and the joint side is substantially polygonal and is an integral multiple of the number of straps of the strap member. Since the straps are joined together and are arranged at the joint sides, the respective straps of the strap member are separated from each other by the force from the occupant-side body member and the body-side body member that are separated from each other when the airbag is inflated. Even if it is attempted to peel off the stitched portion of the substantially polygonal joint side in the central portion of the strap member, the peeling force from each strap is borne by all the sides of the joint side, so the internal stress at the joint side is reduced, The pressure resistance is significantly improved compared with the conventional one in which a strong peeling force acts by the point contact from the strap to the circular suture portion first. It became. Further, if a strap member in which four straps are radially arranged is installed, each strap of the strap member is separated from each other by the force from the occupant side main body member and the vehicle body side main body member which are separated from each other when the airbag is inflated. Even if an attempt is made to peel off the stitched portion of the substantially octagonal joining side in the central part of the, the peeling force from the strap, which is divided by the four straps and becomes smaller, is borne by all the sides of the joining side. The pressure resistance is significantly improved. In this way, the presence of the strap member having significantly improved pressure resistance restricts the excessive expansion and sudden ejection of the inflator from the inflator toward the occupant toward the occupant in the early stage of inflation, thereby preventing the airbag from being vertically and horizontally extended. It is possible to surely prevent the delay of the expansion in the direction and protect the occupant reliably and safely.

Moreover, since the cutting shape between the adjacent radial straps of each strap member is formed into an arc shape having a curvature substantially equal to the cutting shapes of the vehicle body side body member and the occupant side body member, the strap members are included. In order to cut the member pieces such as the reinforcing member from the material for the airbag, the reinforcing members and the occupant side main body members, which are arranged at a predetermined interval in the airbag material, between the reinforced member and It is possible to cut the strap members in a form in which they are arranged, and to cut these member pieces with extremely high yield. In particular, regarding the strap member arranged between the vehicle body side main body member and the occupant side main body member, the shape between the straps adjacent to each other is substantially equal to the cut shape of the vehicle body side main body member and the occupant side main body member. Are formed in an arc shape, their structures are simple, and there is no gap between the vehicle body side body member and the passenger side body member, and there is no room for waste. As described above, according to the present invention, the yield at the time of cutting from the airbag material is dramatically improved, and the airbag having a simple structure and low cost is provided. Further, the reinforcing member and the like are separately cut, and four straps that are orthogonal to each other are provided between the vehicle body-side body member and the occupant-side body member that are arranged in parallel with the airbag material at a predetermined interval. If cutting is performed with the strap member arranged, there is no wasteful portion. Thus, even if a slightly expensive and durable airbag material is used in consideration of safety, an inexpensive airbag can be obtained.

[Brief description of drawings]

FIG. 1 is a diagram of an airbag according to a first embodiment of the present invention.

FIG. 2 is a diagram of an airbag according to a second embodiment of the present invention.

FIG. 3 is a diagram showing a method of cutting an airbag according to the first and second embodiments of the present invention.

FIG. 4 is a diagram of an airbag according to a third embodiment of the present invention.

FIG. 5 is a diagram showing a method of cutting an airbag according to a third embodiment of the present invention.

FIG. 6 is a table showing pressure resistance test data by an expansion simulator comparing the airbag of the embodiment of the present invention with the airbag of the conventional comparative example.

FIG. 7 is a diagram showing a conventional airbag.

[Explanation of symbols]

 1 Airbag 2 Passenger Side Main Body Member 3 Vehicle Body Side Main Body Member 4, 5 Inflator Opening Reinforcement Member 6 Strap Member 6A Strap 6B Strap 6C Strap 6D Strap 7 Strap Member 7A Strap 7B Strap 7C Strap 7D Strap 8 Vent Opening Reinforcement Member 9 Vent opening reinforcing member 10 Inflator opening 11 Vent opening 12 Vent opening 13 Connection end part 14 Stitching part (joint part) 14H Joining side 15 Air bag material 16 Stitching part (joint part) 16H Joining side S Curvature S ' curvature

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[Procedure amendment]

[Submission date] March 22, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

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FIG . 6 shows pressure resistance test data by an expansion simulator comparing the embodiment according to the present invention with a conventional comparative example, and A is a conventional comparative example in which the strap members are circular on both the occupant side and the vehicle body side. What is joined by a sewn portion, B is a first embodiment corresponding to FIG. 1, and C is a second embodiment corresponding to FIG. All of A to C were formed by using the same airbag material, and a practical inflation pressure was applied to the inside of the airbag to obtain the breaking time and the compressive strength at that time as shown in FIG . According to this, it can be seen that the breaking strengths of Examples B and C were substantially the same as those of Comparative Example A, but the compressive strength was significantly improved. Therefore, due to the presence of the strap member whose pressure resistance is significantly improved, excessive expansion of the airbag toward the occupant due to excessive and sudden ejection gas from the inflator at the initial stage of inflation is restricted, and the airbag is vertically and horizontally extended. It is possible to reliably prevent a delay in the expansion of the vehicle, and reliably and safely protect the occupant.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of drawings]

FIG. 1 is a diagram of an airbag according to a first embodiment of the present invention.

FIG. 2 is a diagram of an airbag according to a second embodiment of the present invention.

FIG. 3 is a diagram showing a method of cutting an airbag according to the first and second embodiments of the present invention.

FIG. 4 is a diagram of an airbag according to a third embodiment of the present invention.

FIG. 5 is a diagram showing a method of cutting an airbag according to a third embodiment of the present invention.

FIG. 6 is a diagram showing compressive strength test data by an expansion simulator comparing an airbag according to an embodiment of the present invention with an airbag according to a conventional comparative example.

FIG. 7 is a diagram showing a conventional airbag.

[Procedure 3]

[Document name to be amended] Drawing

[Correction target item name] Fig. 6

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[Procedure amendment]

[Submission date] April 10, 1996

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] Figure 2

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[Fig. 2]

[Procedure 3]

[Document name to be amended] Drawing

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Claims (2)

[Claims] 1. A bag-like body formed by joining a circular body-side body member having an inflator opening formed in the center and a reinforcing member joined to the peripheral edge of the inflator opening, and a circular passenger-side body member. An airbag formed in the above, wherein a pair of vehicle body side strap members and occupant side strap members having radial straps on the vehicle body side body members and the occupant side body members are fixed by joining their central portions, respectively. In an airbag in which corresponding straps of these strap members are connected to each other, at least one central portion of the pair of strap members is connected to a substantially polygonal joint side having an angle of an integer multiple of the number of straps of the strap member. And the respective straps are arranged at the positions of the joint sides while being joined to the corresponding main body members. 2. The cutting shape between the adjacent straps of the radial straps of each strap member is formed in an arc shape having a curvature substantially equal to the cutting shapes of the vehicle body side body member and the occupant side body member. The airbag according to claim 1.