JPH1044901A - Air bag for front passenger seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of wrinkles in a sewed part when an air bag is inflated and to disperse a gas pressure working on an air bag uniformly so as to improve pressure resistant intensity by setting a total value of respective vertical angles of a side face part base fabric in the sewed part below a specific value. SOLUTION: An air bag 100, which is constructed of band shaped approximately rectangular base fabrics P, Q, R and approximately triangular side face base fabrics P1, P2, Q1, Q2, R1, R2 arranged in the both ends mutually opposed along their longitudinal directions, is formed into a bag shape symmetrically with respect to the axis X by individually sewing up sewing parts 10a, 10b, 10c, 10d, 10g, 10h with sewing parts 10k, 101, 10e, 10f, 10i, 10j arranged in the side face base fabrics P1, P2, Q1, Q2, R1, R2 respectively. When the air bag 100 is inflated, the base fabric Q is arranged on the front side of an occupant while the base fabrics R, P are arranged on the upper side and on the lower side of the base fabric Q respectively. In the side face base fabrics P1, Q1, R1 and in the side face base fabrics P2, Q2, R2, a total value 2(a+b+c)(deg) of angle values of respective vertical angles which are not adjacent to the base fabrics P, Q, R is set to be 330(deg) to 360(deg), and one side face is formed by means of the side face base fabrics P1, Q1, R1 while the other side face is formed by means of the side face base fabrics P2, Q2, R2 when the air bag is inflated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag device provided on a passenger side of a vehicle and used for protecting an occupant of the vehicle. The present invention relates to a suture portion shape having a sufficient pressure resistance against a gas pressure acting upon deployment.

[0002]

2. Description of the Related Art Conventionally, as an airbag used in a passenger airbag device, for example, an airbag having a configuration shown in FIG. 9 is known (Japanese Patent Application Laid-Open No. Hei 6-270756). The airbag 200 includes an upper surface base fabric 3, a bottom surface base fabric 1, and a lower surface base fabric 4 formed symmetrically with respect to the axis L.
Are sequentially provided adjacent to each other in the direction of the axis L, and substantially triangular side base fabrics 5, 6, and 7 are provided adjacently on both sides thereof, and they are formed of a single cloth material. . The folded portions 8 and 9 are bent into a mountain shape, and the bent portion 6c is bent into a valley shape. The adjacent sides of the side-surface base fabrics 5, 6, and 7 are overlapped with each other and plane-stitched to form an opening. The airbag 200 is formed in a bag shape having the portion 2. With this configuration, the gas generated by the collision of the vehicle is supplied to the opening 2.
The inside of the airbag 200 is further filled and inflated and deployed, and the bottom fabric 1 is bulged toward the occupant side of the passenger seat, and acts as a cushioning material against an impact at the time of a collision.

[0003]

However, in the airbag 200, the optimum value of the sum of the angles of the apex angles α, β, and γ of the side base fabrics 5, 6, and 7 is not limited. Unconsidered, stress may concentrate on the sutures during inflation and deployment. That is, since the side base fabrics 5, 6, and 7 have an outwardly convex curved surface shape when unfolded, the sum of the apex angles α, β, and γ is 360 (d
eg) or slightly larger than that, wrinkles may occur in the sewn portion during inflation and deployment, and stress due to gas pressure may concentrate on that portion and burst from the sewn portion. However, there is a problem that the pressure resistance is reduced.

[0004] Accordingly, an object of the present invention is to solve the above problems by setting the total value of the apex angles of the side fabrics at the suturing portion to an appropriate value of less than 360 (deg). Prevents the generation of wrinkles at the suturing part during inflation and deployment,
An object of the present invention is to substantially uniformly distribute the gas pressure acting on the airbag and improve the pressure resistance.

[0005]

An airbag is formed by sewing a cloth material formed in a predetermined planar shape into a bag shape,
Since the whole has an outwardly convex curvature at the time of its expansion and deployment, if the sum of the angle values of the apex angle of the suture portion is 360 (deg) or more, a wrinkle is generated in the suture portion, and the wrinkle site is formed. Stress due to gas pressure is concentrated, and the airbag may burst. According to the present invention, the sum of the apex angle
It is a technical idea to improve the pressure resistance of the airbag by setting an appropriate value of less than 0 (deg) without causing wrinkles in the sewn portion.

In order to solve the above problem, according to the first aspect, a plurality of substantially polygonal side portions are provided adjacent to both ends of the strip portion facing each other along the longitudinal direction. The corresponding vertices are aligned when forming a bag shape, and the adjacent sides are overlapped and sewn to form one surface when deployed on each side. And
On each side of the strip in the longitudinal direction, the sum of the angle values of the apex angles having vertices not adjacent to the strip on each side is set to less than 360 (deg). In addition, the lower limit of the total value of the angle values of the apex angles having the vertices is naturally determined within a range that can be manufactured depending on the shape of the airbag when it is deployed. That is, if the total value of the angle values of each apex angle is too small, the height of the side portion becomes large and the shape of the airbag becomes large when trying to secure the area of the belt-shaped portion, and it may not function sufficiently at the time of deployment. If the height of the side portion is to be ensured, the area of the belt-shaped portion is reduced, which may hinder occupant protection. In this manner, the lower limit of the total value of the angle values of each apex angle is determined. As a result, the side portions at each side at the time of inflation and development form a surface having an outwardly convex curvature, so that the sum of the angle values of the respective apex angles is less than 360 (deg), the The curvature of the vicinity can be adapted to the curvature of the side surface, and wrinkles do not occur at the suturing portion near each apex angle, and the stress exerted by the gas pressure can be distributed almost uniformly to the airbag, The pressure resistance can be increased. Preferably, the sum of the angle values of the apex angles of the side surfaces on each side is not less than 330 (deg) and less than 360 (deg). The deployed shape is obtained, and occupant protection can be effectively performed. More preferably, as in the means according to claim 3, the sum of the angle values of the apex angles of the side portions on each side is not less than 345 (deg) and not more than 355 (deg). Of the airbag can be further improved, a more appropriate deployment shape of the airbag can be obtained, and the occupant protection effect can be further enhanced.

According to the fourth aspect of the present invention, each side surface portion is formed in a substantially triangular shape having a base adjacent to the belt-shaped portion, and is aligned so that vertexes opposed to each base overlap. When forming a bag shape, two sides each having one apex as one end are overlapped and sewn with the adjacent sides.
Then, on each side, the total value of the angle values of each apex angle having each vertex is set in a predetermined range. Thereby, each side part can be made into a simple shape, and an airbag can be more specifically realized.

According to the fifth aspect of the present invention, at each of the side surfaces located at both ends in the longitudinal direction of the belt-like portion, a perpendicular is lowered from each apex angle to the longitudinal axis of the belt-like portion. By changing the size of the outer angle in the axial direction among the divided vertex angles, the total value of the angle values of the vertex angles is set to a predetermined value. Thus, the sum of the angle values of each apex angle can be set within a predetermined range by a slight change in the shape of the airbag.

According to the sixth aspect of the present invention, a plurality of rectangular cloth materials are continuously provided in the longitudinal direction to form a belt-like portion. Each side portion is provided adjacent to the rectangular cloth material, and when forming a bag shape, sides adjacent to each other are overlapped and sewn.
Thereby, the shape at the time of inflation and deployment of the airbag can be specifically determined. In particular, if the band-shaped portion is formed of three rectangular cloth materials, the upper surface, the front, and the lower surface, or the right side surface at the time of inflation and deployment, It can be located on the front and left side.

[0010] According to the means of the present invention, at least one of the sides adjacent to each other of the side portions is formed by an outwardly protruding curve, so that the shape of the side portions at the time of inflation and deployment is improved. Since it can be formed into a curved surface, the generation of wrinkles at the stitched portion can be more effectively suppressed.

According to the means described in claim 8, in each side surface portion, the side close to the opening is formed by a straight line, and the other side is formed by an outwardly convex curve. When the airbag is inflated and deployed, the curvature of a portion away from the opening is large, and by forming the side of the portion with a convex curve, an effect equivalent to the means according to claim 7 can be obtained. .

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) Hereinafter, the present invention will be described based on specific embodiments. FIG. 1 is a configuration diagram showing a configuration of a passenger airbag 100 according to a first embodiment of the present invention before sewing. FIG. 2 shows a state in which the airbag 100 is folded and sewn, and FIG.
(B) has shown the right sectional view, respectively. FIG.
4 shows a perspective view of the airbag 100 when the airbag 100 is inflated and deployed, and FIG. 4 shows its view in the direction A (view from the passenger seat side).

The airbag 100 is formed into a predetermined shape by cutting a single piece of cloth material such as nylon, and is mainly composed of a band-shaped portion and a side portion as described in the claims. The belt-like portion is composed of a substantially rectangular base fabric P, a trapezoidal front fabric Q, and a substantially trapezoidal top fabric R, which are successively formed in contact with each other in the direction of the axis X (symmetry axis). Have been. When the airbag 100 is inflated and deployed, the front base fabric Q is located in front of the passenger in the front passenger seat, the bottom base fabric P is below the front base fabric Q, and the top base fabric R is the front base fabric. It is located on the upper surface of Q (see FIG. 3). Thus, the airbag 100 is provided such that the longitudinal axis X is vertical to the occupant.

The bottom base cloth P and the top base cloth R are provided with openings 22 and 20 on the open end side, respectively, and a plurality of mounting holes 23 and 21 are formed at the edges thereof. The mounting holes 23 and 21 are used when the airbag 100 is fixed to a fixing member such as a retainer of an airbag device (not shown) using a fastening member such as a bolt or a nut. The gas generated from the inflator of the airbag device is supplied to the inside of the airbag 100 through the openings 20 and 22, and the airbag 100 is inflated and deployed by being filled. The front base cloth Q has a longer side L _QR in contact with the top base cloth R than the length of the side L _PQ in contact with the bottom base cloth P,
When the airbag 100 is inflated and deployed, a shock can be more effectively absorbed by an occupant.

The side portions referred to in the claims are composed of first side base fabrics P1, P2, second side base fabrics Q1, Q2, and third side base fabrics R1, R2, each of which has a substantially triangular shape. And
It is formed symmetrically with respect to the axis X. 1st side base cloth P
1, P2 has vent holes 24 and 25, respectively.
The bottom sides L _P1 and L _P2 are provided on both sides of the bottom base cloth P so as to be in contact with each other. The vent holes 24 and 25 are used for adjusting the internal pressure by exhausting gas to the outside when the occupant is protected after the airbag 100 is inflated and deployed. The first side base cloth P1 is provided with stitching portions 10a and 10c with stitching margins of a predetermined width provided on the other two sides not in contact with the bottom base cloth P. Similarly, the first side base cloth P2 has a bottom base Stitching portions 10b and 10d are provided with stitching margins of a predetermined width provided on the other two sides not in contact with the cloth P. The suturing portions 10a and 10b are formed linearly,
0d is formed in an outwardly convex curved shape. The vertex angles having the vertices O _P1 and O _P2 facing the respective bases L _P1 and L _{P2 of} the first side base cloths P1 and P2 are the vertices O _P1 and O _P2.
When the perpendicular L _OP lowered from the axis X to the axis X is used, the perpendicular L
The size of the angle between the _OP and the sewn portions 10a and 10b is a (deg), and the size of the angle between the perpendicular L _OP and the sewn portions 10c and 10d is c (deg). Is determined.

The second side base fabrics Q1 and Q2 are provided on both sides of the front base fabric Q with their bottom sides L _Q1 and L _{Q2 in contact} with each other.
The side base cloth Q1 is provided with stitching portions 10e and 10g with predetermined widths of sewing margins on the other two sides not in contact with the front base cloth Q. Similarly, the second side base fabric Q2 is provided with a seam allowance of a predetermined width on the other two sides not in contact with the front base fabric Q, and the seam portion 10f
And 10h. Sutures 10e, 10g,
10f and 10h are both formed in outwardly convex curved shapes. When the perpendicular L _OQ lowered from the vertices O _Q1 , O _Q2 opposing the respective bases L _Q1 , L _{Q2 of} the second side base fabrics Q1, Q2 with respect to the axis X is used, the perpendicular L _OQ and the sewn portion 10 are used.
e, the vertices O _Q1 and O _Q2 are set so that the angle between c and the vertical line L _OQ and the stitches 10g and 10h is b (deg). The size of the apex angle is determined.

The third side base fabrics R1 and R2 are provided on both sides of the upper base fabric R with the bottom sides L _R1 and L _{R2 in contact} with each other.
The side base cloth R1 is provided with stitching portions 10i and 10k on the other two sides not in contact with the front base cloth R, with a predetermined width of seam allowance. Similarly, the third side base fabric R2 is provided with a seam allowance having a predetermined width on the other two sides not in contact with the front base fabric R, and the seam portion 10j
And 101 are provided. The suturing portions 10k and 10l are formed in a straight line, and the suturing portions 10i and 10j are formed in an outwardly convex curved shape. Third side base fabric R1, R2
Vertices O _R1 , O opposing the respective bases L _R1 , L _{R2 of}
With a perpendicular L _OR drawn down relative to the axis X from _R2, perpendicular L _OR a suture unit 10i, the magnitude of the angle between 10j b (d
eg), as vertical line L _OR a suture portion 10k, the size of the angle between 10l becomes a (deg), the size of the apex angle with the vertex O _R1, O _R2 is definite, respectively.

As described above, the perpendicular line L _OP and the suturing portions 10a, 1
0b and the angle between the perpendicular L _OR and the suturing portions 10k and 10l are set to the same size a (deg), and the perpendicular L
_An angle c (de) between the angle formed by the _OP and the sewn portions 10c and 10d is equal to the angle formed by the perpendicular L _OQ and the sewn portions 10e and 10f.
g) is set to Also, the perpendicular line L _OQ and the sewn portion 10g,
And angle between 10h, vertical line L _OR a suture unit 10i, 10j
Are set to the same size b (deg). Then, on each side, the total value of the angle values of the apex angles facing the bases L _P1 , L _Q1 , and L _R1 of the side base cloths P1, Q1, and R1, and the sum of the angle values of the side base cloths P2, Q2, and R2 The sum of the angles of the apex angles facing the bases L _P2 , L _Q2 , and L _R2 , that is, the value of 2 (a + b + c) (deg) is 330 (deg)
It is set to less than 360 (deg).

Each of the side base fabrics P1, P2, Q1, Q2,
R1, and in R2, suture portion 10c and 10e, and the sewn portions 10d and 10f, respectively provided symmetrically to the sides L _PQ, sewn portion 10g and 10i and the stapling portion 10h and 10j, respectively It is provided symmetrically with respect to the side L _QR . The sewn portions 10a and 10k and the sewn portions 10b and 10l are provided symmetrically with respect to a line (not shown) perpendicular to the axis X.

Next, a method of suturing the airbag 100 formed in the shape shown in FIG. 1 will be described. First, the vertex O _P1 of the first side surface backing P1 folded in a mountain-type airbag 100 at the sides L _PQ, and vertex O _Q1 of the second side base cloth Q1 are aligned, the first side base cloth P2 Vertex _OP2 and the second
And vertex O _Q2 side base fabric Q2 are aligned. Then, the vertexes O _P1 , O _Q1 , and O _R1 are folded into a valley shape at the perpendicular line L _OQ and a mountain shape at the side L _QR to align the vertices O _P2 , O _R2.
Align _Q2 and _OR2 .

By folding the airbag 100 in a plane and aligning the vertices, the suturing portion 1
0a and 10k, sutures 10b and 10l, sutures 10c and 10e, sutures 10d and 10f, and sutures 10g and 10
i and the suturing portions 10h and 10j are respectively aligned. In this state, each of the aligned suture portions 10
a and 10k, sutures 10b and 10l, sutures 10c and 1
0e, suturing portions 10d and 10f, suturing portions 10g and 10i,
By suturing the sewn portions 10h and 10j, the airbag 100 is formed in a bag shape (see FIG. 2). Thereafter, the airbag 100 is mounted on the airbag device by using the mounting holes 21 and 23 with the front and back reversed.

When gas is generated from the inflator upon detection of a collision, the gas is supplied to the airbag 100 mounted on the airbag device.
It is supplied and filled from 2 and expanded and deployed. FIG. 3 is a perspective view at this time, and FIG. 4 is a view in the direction A in FIG. When the airbag 100 is deployed, the front base fabric Q is arranged on the front of the occupant, and the top base fabric R and the bottom base fabric P are arranged above and below the front base fabric Q, respectively. The vertices O _P1 , O _Q1 , and O _R1 of the side base cloths P1, Q1, and R1 are sewn so as to coincide with each other, so that one side is formed by the side base cloths P1, Q1, and R1. Have been. Similarly, in the side base fabrics P2, Q2, and R2, the vertices O _P2 , O _Q2 , and O _R2 are stitched together, and these side base fabrics P2, Q2, and R2 form one side surface.

In FIG. 4, the contour 100A of the side surface of the airbag 100 at the time of inflation and deployment has an outwardly convex curvature.
The total value (2 (a + b + c) (deg)) of the sum of the angle values of the apex angles of the side base fabrics P1, Q1, and R1 and the sum of the apex angles of the side base fabrics P2, Q2, and R2 is 330. (deg) or more and less than 360 (deg), the airbag 1
No wrinkles occur at the suture part during the expansion and deployment of 00,
A smooth surface can be formed. As a result, stress concentration on the suturing portion near each apex angle due to gas pressure is prevented, and the stress can be dispersed almost uniformly, so that rupture from the suturing portion is prevented and the pressure resistance of the airbag 100 is increased. Becomes possible.

FIG. 5 shows the sum of the apex angle values 2 (a + b).
12 is a graph showing the relationship between + c) (deg) and the burst strength of the airbag 100. It can be seen from FIG. 5 that the burst strength tends to decrease as the total angle value increases. In particular, when the total value of the angle values is 360 (deg) or more, the rupture strength is reduced because the sewn portions are wrinkled when the airbag 100 is inflated and deployed (the rupture strength is about 120 kPa or less). When the total value of the angle values is less than 360 (deg), generation of wrinkles during expansion and development can be prevented, and burst strength can be increased (burst strength is about 120 kPa or more).

FIG. 5 shows that the burst strength increases as the total value of the angle values decreases.
This lower limit is restricted by the shape of the airbag 100. That is, if the total value of the angle values is too small, the base fabrics P, Q,
If the area of R and R is secured, each side fabric P1, P2, Q
1, Q2, R1, and R2 increase in height, so that the airbag 100 becomes long in the lateral direction when deployed, and the shape of the airbag 100 becomes large, and may not function sufficiently during deployment. In addition, each side base cloth P1, P
If the heights of 2, Q1, Q2, R1, and R2 are secured, the areas of the base fabrics P, Q, and R cannot be secured, and the occupant cannot be effectively protected when the airbag 100 is deployed. Thus, the total value of the angle values is restricted by the shape of the airbag 100, and if the total value of the angle values is less than 330 (deg), it is difficult to realize an appropriate shape of the airbag 100. Therefore, it is effective if the total value of the angle values is 330 (deg) or more, and desirably, an effective value is 345 (deg) or more and 355 (deg) or less. In FIG. 5, the order of the burst pressure exceeds 100 kPa, but the pressure level acting on the airbag 100 by the gas generated from the inflator is actually lower than this order. However, since the pressure resistance of the airbag 100 decreases due to aging or the like, the pressure resistance is set high in this embodiment in anticipation of that.

In this embodiment, the suturing portions 10a, 10b, 10k, and 10l adjacent to the openings 20 and 22 are formed linearly, and the other suturing portions 10c and 10d not adjacent to the openings 20 and 22 are formed. , 10e, 10f, 10g, 10h,
Since 10i and 10j are formed in outwardly convex curved shapes, it is easy to form curved surfaces of the respective side portions during expansion and deployment, and it is possible to further reduce stress. In addition, the adjustment of the total value 2 (a + b + c) (deg) of the above-mentioned angle values is performed by adjusting the side base fabrics P1, P2,
In each of R1 and R2, when each apex angle is divided into two by perpendiculars L _OP and L _OR , outer corners, that is, an angle formed by the perpendicular L _OP and the sewn portions 10a and 10b, and a perpendicular L _OR
It is effective to adjust the size of the angle formed by the suturing portion 10k and 10l. That is, by doing so, the total value of the angle values can be adjusted by a slight change in the shape of the airbag 100.

In the above embodiment, each side base fabric P1, P2,
Although Q1, Q2, R1, and R2 are all substantially triangular, other shapes may be used. For example, in FIG. 1, the side base fabrics R1, R2 provided on both sides of the top base fabric R may be provided adjacent to the side base fabrics P1, P2. The configuration of the airbag 101 in this case is shown in FIG. 6, but no side base cloth is provided on both sides of the top base cloth R, and a substantially square side base cloth PR1 on both sides of the bottom base cloth P, and Side fabric PR
2 are provided adjacent to each other. Side fabric PR1, PR2
The sewn portions 10c and 10d sewn to the sewn portions 10e and 10f of the side base fabrics Q1 and Q2,
g and 10h to be sewn to the suture portions 10i and 10j, respectively.
And sewn portions 10m and 10n provided on the upper surface fabric R and sewn portions 10o and 10p to be sewn, respectively.

The airbag 101 is constructed as shown in FIG. 6, and the vertices O _PR1 and O _PR2 , the vertices O _Q1 and O _Q2 , the vertices O _PR11 and O _PR11 .
_{Align PR12} with vertices O _QR1 and O _QR2 respectively,
The corresponding sewn portions are formed into a bag shape by suturing, and apex angles having vertices O _PR1 , O _PR2 not adjacent to the base fabrics P, Q, and R as band portions, and vertices O _Q1 , O _{Q2, respectively.} If the total value of the angle values with the apex angle having each is set to be 330 (deg) or more and less than 360 (deg), wrinkles do not occur in the suture portion at the time of inflation and deployment as in the configuration shown in FIG. , The pressure resistance can be increased. As described above, the shape of the side base fabric may be substantially square, and if the sum of the angle values of the apex angles not adjacent to the strip portion is 330 (deg) or more and less than 360 (deg), the shape is substantially polygonal. I just need. Further, as shown in FIG. 6, the side fabric may not necessarily be formed continuously at both ends of the band, and there may be a portion where the side fabric is not provided in the band.

In the configuration shown in FIG.
0 is formed symmetrically with respect to the axis X,
May be formed in an asymmetric shape. For example, by configuring the left side of the axis X as shown in FIG. 1 and the right side of the axis X as shown in FIG. 6 as shown in FIG. 7, the airbag 102 can be configured to be asymmetric with respect to the axis X. . The total value 2 (a + b + c) (deg) of the angle values of each apex angle of the side surface is 330 (de).
g) If it is not less than 360 (deg), such an asymmetric shape may be adopted.

(Second Embodiment) FIG. 8 is a view showing a configuration of an airbag 103 according to a second embodiment of the present invention.
In the first embodiment, the longitudinal direction of the belt portion is provided in the longitudinal direction with respect to the occupant. In the second embodiment, the longitudinal direction of the belt portion is arranged in the lateral direction (vehicle width direction) with respect to the occupant. The feature is that it is provided. The airbag 103 is formed into a predetermined shape by cutting a single piece of cloth material, and a triangular base cloth S, a trapezoidal base cloth T, and a triangular base cloth U are sequentially formed in the longitudinal direction as band-like portions. It is provided in contact with. Since the longitudinal direction of the airbag 103 is provided in the lateral direction, the base fabric T is deployed on the front of the occupant and the base fabrics S and U are deployed on the side surfaces when inflated.

The airbag 103 has a base fabric S as a side portion.
Upper and lower base cloths S1 and S2 provided on both sides of the base cloth T, and upper and lower base cloths T1 and T provided on both sides of the base cloth T
2. It has a top base cloth U1 and a bottom base cloth U2 provided on both sides of the base cloth U, respectively. The top base cloth T1 and the bottom base cloth T2 have a triangular shape, and the top base cloths S1, U1 and the bottom base cloths S2, U2 have a substantially rectangular shape, with respect to an axis Y substantially orthogonal to the longitudinal direction of the band-shaped portion. It is formed in a symmetrical shape.
The base fabrics S and T are respectively formed with vent holes 34 and 35 for adjusting the internal pressure during expansion and deployment. Upper surface fabric S
At 1, T1, and U1, each vertex _OS1 , _OT1 , and _OU1
Are overlapped and aligned, and the stitched portions 30a and 30f, the stitched portions 30b and 30c, and the stitched portions 30d and 30e are stitched to form one surface. Also, the base fabric S2,
In T2, and U2, aligned to overlap each vertex O _S2, O _T2, and O _U2, sewn portion 30g and 30l, suture section 30
h and 30i and the sewn portions 30j and 30k are sewn to form one surface. In addition, as shown in FIG. 8, all the suturing portions 30a to 30l are linear.

The base cloths S1 and S2 are provided with openings 42 having a plurality of mounting holes 43, respectively.
U2 is provided with openings 40 each having a plurality of mounting holes 41. The airbag 103 is fixed to an airbag device (not shown) using the mounting holes 41 and 43, and the gas generated from the inflator is supplied to the openings 40 and 42.
From inside to be expanded and deployed. Upper surface fabric S
The sum of the angle values of the apex angles having vertices O _S1 , O _T1 , and O _U1 at 1, T1, and U1 (d + 2e) (deg)
Is set to be 330 (deg) or more and less than 360 (deg). Similarly, in the bottom base fabric S2, T2, and U2, each vertex O _S2, O _T2, and O the sum of the angle values of the vertical angle with _{U2 (f + 2g) (deg} ) is 330 (deg) or 3
It is set to be less than 60 (deg).

With the configuration shown in FIG. 8, when the airbag 103 is inflated and deployed, the upper base fabrics S1, T1, and U1
And the base fabrics S2, T2, and U2 each form one surface having an outwardly convex curvature. Since the sum of the angle values of the apex angles is set to an appropriate value, the suture is performed. The stress concentration due to the gas pressure can be reduced without causing wrinkles in the portions, and the pressure resistance of the airbag 103 can be increased. With the configuration in which the longitudinal direction of the band-shaped portion is provided in the horizontal direction, the same effect as in the first embodiment can be obtained.

In the first embodiment, the rectangular base cloth P,
A belt-like portion is formed by providing Q and R continuously in the longitudinal direction. In the second embodiment, a rectangular base cloth T is formed.
And the triangular base fabrics S and U are continuously provided in the longitudinal direction to form the band portion. However, the band portion may be formed of a single rectangular cloth material. If it is formed, its shape and configuration are not limited. Further, in each of the above embodiments, the plane shape of the airbag is obtained by cutting one piece of cloth material, but the plane shape of the airbag is obtained by sewing a plurality of separated cloth materials. You may.

In the first embodiment, the suturing portions 10a, 10a
b, 10k, and 10l in a straight line,
d, 10e, 10f, 10g, 10h, 10i, and 1
0j is constituted by an outwardly convex curve, and in the second embodiment, all the stitched portions 30a to 30l are constituted by straight lines. However, the stitched portion may be constituted only by an outwardly convex curve. Good. In the first embodiment, the perpendicular line L _OP and the suturing portion 1
0a and 10b, the perpendicular _LOR and the suture 10
The configuration is such that the total value of the angle values is adjusted to a predetermined range by adjusting the size of the angle formed by k and 10l. However, the total value of the angle values is adjusted by adjusting the size of the other angles. You may.

As indicated above, according to the present invention,
Side surfaces are provided at both ends of the band portion of the airbag opposed in the longitudinal direction, and the sum of the angle values of the apex angles facing the sides adjacent to the band portion on each side surface portion is less than 360 (deg), preferably 330 (deg). By suturing each side surface at not less than 360 (deg) and more desirably at least 345 (deg) and not more than 355 (deg), stress concentration due to gas pressure can be achieved without causing wrinkles in the stitched portion during expansion and deployment. And the pressure resistance of the airbag can be increased.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a configuration before suturing according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a configuration after suturing according to the first embodiment of the present invention.

FIG. 3 is a perspective view showing a configuration of the first embodiment according to the present invention when inflated and deployed.

FIG. 4 is a schematic diagram showing the first embodiment according to the present invention as viewed in the direction A during inflation and deployment.

FIG. 5 is a relationship diagram showing a relationship between a suturing angle and a rupture pressure in the first embodiment according to the present invention.

FIG. 6 is a configuration diagram showing a configuration provided with a substantially square side fabric in the first embodiment according to the present invention.

FIG. 7 is a configuration diagram showing an asymmetric configuration with respect to a longitudinal axis of a band-shaped portion in the first embodiment according to the present invention.

FIG. 8 is a configuration diagram showing a configuration before suturing according to a second embodiment of the present invention.

FIG. 9 is a configuration diagram showing a conventional airbag shape.

[Explanation of symbols]

 P bottom base cloth Q front base cloth R top base cloth P1, P2 first side base cloth Q1, Q2 second side base cloth R1, R2 third side base cloth S, T, U base cloth S1, T1, U1 top base Cloth S2, T2, U2 Base fabric 10a to 10l Stitching part 20, 22, 40, 42 Opening 21, 23, 41, 43 Mounting hole 24, 25, 34, 35 Vent hole 30a to 30l Stitching part 100 to 103 Air bag

Claims (8)

[Claims] 1. A bag material having an opening through which gas flows is formed by sewing a cloth material obtained by flatly developing a three-dimensional airbag, folded, and stored in a passenger airbag device. In the airbag, a belt-like portion, a substantially polygonal shape, a plurality of apexes are provided adjacent to both ends facing each other along the longitudinal direction of the belt-like portion, and each vertex corresponding to a bag-like shape is positioned. By being stitched by overlapping and suturing adjacent sides, each side has one
And a side portion forming one surface, and on each side of the band-shaped portion facing along the longitudinal direction, an angle value of each apex angle of each apex of each vertex not adjacent to the band-shaped portion of each side surface portion. An airbag for a passenger seat, wherein the total value is less than 360 (deg). 2. In each of the sides, the sum of the angle values of the apex angles of the side surfaces is 330 (deg) or more and 360 degrees or more.
The airbag for a passenger seat according to claim 1, wherein the airbag is less than (deg). 3. On each side, a total value of the angle values of the apex angles of the side surface portions is 345 (deg) or more and 355 (deg).
The airbag for a passenger seat according to claim 2, wherein the temperature is (deg) or less. 4. Each of the side portions has a substantially triangular shape having a base adjacent to the band-shaped portion as a base, and the respective vertices facing the respective bases are aligned so as to overlap each other to form a bag-like shape. Sometimes, each of the two sides having each vertex as one end is overlapped and stitched with the side adjacent to each other, and on each side, the total value of the angle values of each apex angle having each vertex is within the predetermined range. The passenger seat airbag according to any one of claims 1 to 3, wherein: 5. In each of the side surface portions located at both ends in the longitudinal direction of the band portion, the side portions are defined by perpendicular lines lowered from their apex angles to the longitudinal axis of the band portion.
The sum of the angle values of the respective apex angles is set in the predetermined range by a change in the magnitude of the outer angle in the axial direction among the divided apex angles. Item 7. An airbag for a passenger seat according to Item 4. 6. The belt-like portion has a shape in which a plurality of rectangular cloth materials are continuously provided in the longitudinal direction, and the side portions face each other along the longitudinal direction of the belt-like portion. 5. The airbag for a passenger seat according to claim 4, wherein the sides are provided adjacent to the respective rectangular cloth materials at both ends, and the sides adjacent to each other when forming a bag shape are overlapped and sewn. 6. . 7. The side surface portion according to claim 1, wherein at least one of the sides adjacent to each other is formed by an outwardly convex curve. Passenger airbag. 8. In each of the side portions, the side adjacent to the opening is formed by a straight line, and the other side is formed by an outwardly convex curve. An airbag for a passenger seat according to the item.