JPH0796808A - Manufacture of vehicle air bag and vehicle air bag - Google Patents

Abstract

PURPOSE:To form an air bag by plane sewing into a square shape solid body in which each side of circumference in both obverse and reverse faces form a rectilinear shape at the time of inflation and unfolding. CONSTITUTION:A circumference of a pair of base material sheets 1a, 1b is sewn to form a hollow bag-shape and it is turned inside out. The base material sheet is fundamentally quadrilateral, and each side is formed with a protruding edge forming smooth curves from both ends to the center and extending outward. One side base material sheet 1b is an inflator fitting side, and a sheet face of the other side base material sheet 1a forms a restriction face of a human body. At the time of inflation and unfolding, a convex-shape protruding edge of each side compensates shape deformation of each side of circumference to form an air bag 6 into a rectangular solid wherein each side of circumference in obverse and reverse two faces forms a rectilinear shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle airbag manufacturing method and a vehicle airbag for protecting an occupant, particularly an occupant in a passenger seat, from the impact of a vehicle collision.

[0002]

2. Description of the Related Art As a vehicle airbag used for the above purpose, a circular airbag 14 shown in FIG. 7 is known for a driver. Airbag for driver 1
4 is built into the steering wheel in front of the driver's seat,
It expands and deploys in front of the steering wheel in an emergency. In the driver's seat, the steering wheel is confronted and the driver's range of motion is considerably restricted, so a circular airbag with a relatively small capacity as shown in Fig. 7 is sufficient. Since there is no obstruction up to the vehicle dashboard, a large-capacity one is required to install the passenger airbag. Conventionally, an airbag 15 shown in FIG. 8 is known as an airbag for a passenger seat.

[0003]

The airbag 15 for the passenger seat shown in FIG. 8 is designed to inflate and deploy in the shape of a rectangular pyramid whose bottom surface serving as a restraining surface for the occupant is inflated. However, the three-dimensional sewing of the base material sheet must be performed, and the sewing work is extremely troublesome.

Further, in order to inflate and deploy the airbag from the surface of the dashboard or below the dashboard to the area reaching the face of the passenger in the passenger seat, a considerably large amount of gas is required, and the amount of gas A strong explosive force is required to apply an explosive force to a fixed shape in a short time, and the bag is required to have high pressure resistance.

By the way, what is most dangerous in a vehicle collision is that the occupant leans forward due to the reaction caused by the sudden stop of the vehicle and hits his face on the dashboard. When the vehicle suddenly stops while traveling at a higher speed, a situation occurs in which the vehicle is ejected from the seat, breaks through the windshield, and is thrown out of the vehicle. Especially in the passenger seat, there are no obstacles like the steering wheel in the driver's seat,
The degree of danger when a collision accident occurs is high.

However, the passenger in the front passenger seat is obliged to wear a seat belt, and as long as he / she wears the seat belt, the shake in the forward direction due to the recoil at the time of a collision is considerably reduced. However, the collision of the vehicle is not limited to the frontal collision, and the occupant may shake the body diagonally forward due to the impact from the diagonal direction. Therefore, it is rather important to inflate and deploy the airbag in the widest possible area in front of the passenger in the passenger seat.

An object of the present invention is to provide a method of manufacturing a vehicle airbag and a vehicle airbag in which a restraining surface effective for expansion and deployment is formed over a wide area in front of the front of the passenger seat.

[0008]

In order to achieve the above object, in a method for manufacturing a vehicle airbag according to the present invention, a pair of base sheets are sewn and turned over, and when inflated and expanded, two front and back surfaces are formed. A method for manufacturing a vehicle airbag in which each of four sides is shaped into a rectangular solid having a straight line shape, and the pair of base sheets are basically rectangular, and each side is smooth from both ends to the center. Has a convex edge of a convex shape extending outward in the shape of a curved line, one base material sheet is one in which an inflator insertion port and a vent hole are opened on the sheet surface, and the other base material sheet is The binding surface of the human body is formed on the seat surface, and the pair of base material sheets are sewn to form a hollow bag-like shape by sewing the peripheral portions of the respective sides while keeping a constant distance from the outer edge. The inversion of the pair of base sheets It is performed through the mouth.

Further, the vehicle airbag according to the present invention has a pair of base material sheets sewn at their peripheral edges,
An airbag for a vehicle, which is shaped into a rectangular solid when inflated and deployed, wherein a pair of base material sheets are combined in a hollow bag shape with a sewn portion inside and each base material sheet. Is based on a rectangle, and has a convex edge on each side that forms a smooth curve from both ends to the central portion and projects outwards.One of the base sheets has an inflator insertion port on the sheet surface. And the vent hole is opened, and the other base material sheet forms a restraining surface of the human body on the seat surface.
The shape of each side is formed in a straight line by compensating the deformation of the shape of each side of the four sides of the front and back surfaces of the three-dimensional object that is formed during expansion.

The base sheet is a woven fabric, and the texture of the woven fabric is shown in the bias direction on each side of the pair of base sheet.

[0011]

[Function] When a pair of rectangular base sheets are sewn in a bag shape at the peripheral portion and gas is pressed into the interior to expand and expand, the expanded and expanded shape is the surface of one base sheet. When viewed from the direction, as shown in FIG. 6A, the center portion of each side has an irregular shape with a concave curve, and the side surface has a narrow middle-high curved surface as shown in FIG. 6B. It becomes the shape. When the inflated and unfolded shapes shown in FIGS. 6A and 6B are applied to the airbag as they are, the substantial effective restraining area is only a small area of the central portion.

In the present invention, the base sheet 1 of the airbag is basically a horizontally long rectangle connecting the vertices a, b, c and d as shown in FIG. 1, and each side is smooth from both ends to the center. A sheet having a convex edge 2 having a convex shape which is curved outwardly and is projected outward is used.

In FIG. 2, a pair of base material sheets 1a, 1
Using b as the front and back sides, the outer peripheral edge is sewn along the contour of the base material sheet. The front side seat 1a forms the restraining surface 3 of the airbag, and the back side seat 1b serves as an inflator mounting side, and an inflator insertion port 4 and a vent hole 5 are opened on the seat surface. Both seats 1a, 1
After b is sewn, the inner and outer surfaces are inverted as shown in FIG.

In the present invention, the overhang reduction amount ΔF of the constriction on each side shown in FIG. 6A is compensated.
Inflating the airbag according to the present invention in FIGS.
The shape of the model when unfolded is shown. 4 (a) to (c)
As is clear from the figure, the shape of the airbag inflated and expanded is a horizontally long solid with both front and back sides, but the front or back side has a straight line on each side of the four sides when viewed from the front. Four
As shown in (a), it becomes rectangular, and most of the area of the front substrate sheet 1a can be used as an effective restraining surface.

According to the present invention, it is possible to form a horizontally-long or vertically-long three-dimensional body close to a rectangular parallelepiped at the time of expansion and expansion by plane sewing, which does not rely on three-dimensional sewing but by simply sewing the peripheral edges of a pair of base material sheets. . When a woven cloth is used as the base sheet, the woven cloth is a mixture of warp threads and weft threads at a right angle, and therefore has anisotropy in terms of elongation.

Therefore, in FIG. 1, if the direction of the texture is set on each side of the base material sheet so as to be oriented in the direction (bias direction) forming an angle with respect to the warp and weft directions (forward direction) of the fabric structure. The maximum degree of elongation is obtained at an inclination angle of 45 ° with respect to the warp and weft directions, and the projecting length of the projecting edge 2 on each side can be minimized.

The base sheet 1 is a woven fabric woven of synthetic fibers such as nylon and polyester, a woven fabric woven of heat resistant fibers such as aramid and carbon fibers, and these woven fabrics are also heat resistant such as rubber and silicone rubber. In addition to the resin coating or calendering, a resin coating and calendering may be used in combination. Further, in order to limit the rising height, a hanging cloth (not shown) of a certain length may be attached between the two base material sheets facing each other. Further, it is also possible to provide an air bag in which a square-shaped base sheet is provided with a convex edge having a middle height on each side to inflate and expand into four equal peripheral solids.

[0018]

EXAMPLES Examples of the present invention will be shown below. In FIG. 1, a seam allowance is secured at the peripheral edge, and a long axis 710 mm and a short axis 56
The airbag 6 of the embodiment was cut into an oval shape of 0 mm, and a pair of sewing patterns in which a weave was expressed in the bias direction on each side was used as the base sheet 1, and a pair of base sheets were sewn and inverted.
And In addition, although an inflator insertion port and a vent hole are opened in one of the base material sheets, the illustration is omitted.

When air was pressed into the inflator 5 to the maximum extent, it expanded and expanded into a solid body of 62 cm in width × 47 cm in length × 37 cm in thickness as shown in FIGS. 4 (a) and 4 (b). The effective restrained area S ₁ was 2900 cm ² .
For comparison, secure a seam allowance on the periphery and 700 mm x 65
An air obtained by cutting into a 0 mm rectangle and using a pair of sewing patterns shown in FIG. When air is pressed into the bag 12 to the maximum extent, FIG.
As shown in (a), a constriction is formed at the center of each side, and a convex curved surface 13 is formed on the sheet surface as shown in FIG. 6 (b). According to the airbag 12 of the comparative example, the effective restraining area S ₂ when the curved surface of the seat surface is used as the restraining surface is 1600 cm ² at the maximum estimation.

As is clear from the comparison between the example and the comparative example, according to the example, although the area of the base sheet is larger than that of the comparative example, An effective restraining area of 8 times was obtained. Further, when the pressure resistance is compared, the pressure resistance of the example is 1.5 kg · f / c.
m ² and that of the comparative example were 1.1 kg · f / cm ² .

[0021]

As described above, according to the present invention, it is possible to form a wide effective restraining area by imprinting into a regular three-dimensional body whose front and back surfaces are square when expanded and expanded. Since it is possible to perform plane sewing only by sewing the peripheral edges of the pair of base material sheets without using sewing, the entire sewing process can be automated, and the quality can be stabilized and mass production can be realized.

According to the present invention, not only an airbag for a passenger seat but also an airbag for a driver can be mounted so as to be inflated or expanded in a landscape orientation, and can also be applied to a rear seat to provide safety for an occupant. Has the effect of ensuring

[Brief description of drawings]

FIG. 1 is a diagram showing a base sheet used in the present invention.

FIG. 2 is a diagram showing a combination procedure of a pair of base material sheets.

FIG. 3 is a cross-sectional view of the airbag, which is reversed after sewing.

4A is a partially sectional front view showing a shape of an airbag, FIG. 4B is a central longitudinal sectional view, and FIG. 4C is a central transverse sectional view.

FIG. 5 is a diagram showing a base material sheet of a comparative example.

FIG. 6A is a plan view showing a shaped shape of an airbag of a comparative example, and FIG. 6B is a sectional view taken along line YY of FIG.

FIG. 7 is a diagram showing a driver airbag.

FIG. 8 is a view showing a conventional passenger airbag.

[Explanation of symbols]

 1, 1a, 1b Base sheet 2 Projection edge 3 Restraint surface 4 Inflator insertion port 5 Vent hole 6 Air bag

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Keiji Hayashi 79 Shimoshiburucho, Ashikaga City, Tochigi Prefecture (72) Inventor Kota Washi 3365 Minamiomachi, Ashikaga City, Tochigi Prefecture (72) Inventor Yuichi Itabashi, Minatomachi, Tsuchiura City, Ibaraki Prefecture 2-9-35 Sejuru Minatomachi No. 202 (72) Inventor Koji Asada 2-9-10 Minamikasugaoka, Ibaraki City, Osaka Rosheim Kasugaoka 2F

Claims (3)

[Claims] 1. A method of manufacturing an air bag for a vehicle, wherein a pair of base material sheets are sewn together and turned over, and when inflated and expanded, the two sides of the front and back surfaces are shaped into a rectangular solid having straight sides. The pair of base sheets are basically rectangular, and each side has a convex edge of a convex shape extending outward in a smooth curve from both ends to the center. Is one in which an inflator insertion port and a vent hole are opened in the seat surface, and the other base material sheet forms a restraining surface for a human body on the seat surface. A peripheral bag of each side is sewn to form a hollow bag shape while keeping a constant distance from the outer edge, and a pair of base material sheets is turned over through an inflator insertion port. Manufacturing method for automobile airbags. 2. An air bag for a vehicle, comprising a pair of base material sheets having sewn peripheral edges, which is shaped into a rectangular solid when inflated and deployed. It is a hollow bag-shaped combination with the attached part as the inside, and each base sheet is basically rectangular, and each side has a middle-high shape that extends outward from a smooth curve from both ends to the central part. One of the base sheets has an inflator insertion port and a vent hole formed in the sheet surface, and the other base sheet forms a restraining surface for a human body on the sheet surface. The convex edge of each side is to form a straight line by compensating for the deformation of the shape of the four sides of the two sides of the three-dimensional body that is shaped when the airbag is inflated and deployed. An air bag for vehicles characterized by. 3. The vehicle according to claim 2, wherein the base sheet is a woven fabric, and the texture of the woven fabric is represented in the bias direction on each side of the pair of base sheet. Airbag.