JP7216594B2 - Airbag and occupant restraint system - Google Patents

Description

TECHNICAL FIELD The present invention relates to an airbag and an occupant restraint system for restraining an occupant of an automobile. More specifically, the present invention relates to an airbag installed in the seat back of an automobile, etc., which inflates and deploys so as to surround the front and both sides of an occupant in the event of an emergency such as a collision, and an occupant restraint system equipped with this airbag. .

Patent Document 1 describes an occupant restraint device in which an airbag inflates and deploys so as to surround the front and both sides of the occupant's head in an emergency such as a collision or overturn of the automobile. The airbag of the occupant restraint system of Patent Document 1 has a frame duct that inflates and deploys above the occupant's head when viewed from the seat width direction, and a front inflation that receives gas from the frame duct and inflates and deploys in front of the occupant's head. and a pair of lateral inflatable portions that receive gas supplied from the frame duct or the front inflatable portion and inflate and deploy on both sides of the occupant's head.

When the airbag of the occupant restraint system of Patent Document 1 inflates, the occupant's head is surrounded by the front inflatable portion and the pair of lateral inflatable portions from three directions, i.e., the front and both sides of the seat.

JP 2017-30373 A

The present invention provides an airbag that is installed on a seat back or the like and has a third inflation portion that inflates in front of the occupant and first and second inflation portions that inflate on both sides of the occupant's head, An object of the present invention is to provide an airbag in which the front portions of first and second inflatable portions are in an oblique direction with respect to the front-rear direction of a vehicle body in front of an occupant's head, and an occupant restraint device provided with the airbag.

The occupant restraint system of the present invention is an airbag that inflates and deploys from a seat back, a headrest, or an interior member behind the seat back of an automobile seat to restrain an occupant of the seat. It comprises first and second inflatable portions that inflate and deploy on both sides, and a third inflatable portion that inflates and deploys in front of the chest of the occupant, the upper portion of the third inflatable portion being in front of the first and second inflatable portions. In the airbag connected to the section, the surfaces of the front portions of the first and second expansion sections facing the occupant are triangular in plan view, and the main portion of the rear surface of the third expansion section is the It is characterized by being planar.

In one aspect of the present invention, each of the first expansion portion and the second expansion portion has an intermediate portion between the rear end and the front portion. width is greater than the width of the top.

An occupant restraint system of the present invention includes the airbag of the present invention and an inflator for inflating the airbag.

In the occupant restraint system of the present invention, since the front portions of the first and second expansion portions are triangular, the front portions of the first or second expansion portion directly face the occupant's head in the event of an offset collision or an oblique collision. Or to efficiently restrain an occupant's head in a state close to it.

4 is a plan view of the airbag according to the embodiment when inflated. FIG. FIG. 4 is a side view of the airbag according to the embodiment when inflated. 2 is a cross-sectional view taken along line III-III of FIG. 1; FIG. FIG. 3 is a cross-sectional view taken along line IV-IV of FIG. 2; FIG. 3 is a sectional view taken along line VV of FIGS. 1 and 2; FIG. 6 is a sectional view taken along the line VI-VI of FIG. 5; FIG. 2 is a cut end view along line VII-VII of FIG. 1;

An airbag and an occupant restraint system according to an embodiment will be described with reference to FIGS. In the following description, front, rear, left, and right correspond to the front, rear, left, and right of an automobile.

The airbag 1 includes a first inflation portion 10 that inflates and deploys forward from the upper portion of the seat back S through the left side of the occupant P's head H, and a first inflation portion 10 that inflates and deploys forward from the upper portion of the seat back S to the right side of the occupant P's head H. The second inflatable portion 20 that inflates and deploys forward through the occupant P and the front portions 10 f and 20 f of the first inflatable portion 10 and the second inflatable portion 20 . 3 inflatable portion 30 .

An imaginary line connecting the occupant facing surfaces of the front portions 10f and 20f of the first and second inflatable portions 10 and 20 and the intermediate portions of the occupant facing surfaces of the front portions 10f and 20f and parallel to the vehicle body width direction ( 1) to form a triangular shape. The tip of the triangle may be rounded. In other words, the occupant facing surfaces of the front portions 10f and 20f of the first and second inflation portions 10 and 20 form a V shape in plan view (FIG. 1).

The first inflatable portion 10 and the second inflatable portion 20 include rear ends 10e and 20e, front portions 10f and 20f located forward of the occupant's head H, rear ends 10e and 20e, and front portions 10f and 20f. It has intermediate portions 10m and 20m between. The intermediate portions 10m and 20m extend in the longitudinal direction of the vehicle body. The intermediate portions 10m and 20m are substantially parallel to each other.

The front portions 10f and 20f extend in an oblique direction with respect to the longitudinal direction of the vehicle body so as to approach each other toward the front. The front portions 10f and 20f cross each other at the front end 1f of the airbag 1. As shown in FIG.

The first inflatable portion 10 and the second inflatable portion 20 have first surfaces 11 and 21 facing the occupant's head H and second surfaces 12 and 22 facing away from the occupant. In the intermediate portions 10m, 20m, the first expansion portion 10 and the second expansion portion 20 further have bottom surfaces 13, 23. As shown in FIG.

The first surfaces 11, 21 and the second surfaces 12, 22 are closer to each other as they go upward, and meet at their upper ends to form top sides 10t, 20t. The top sides 10t and 20t of the intermediate portions 10m and 20m are positioned at the center of the first expansion portion 10 and the second expansion portion 20 in the left-right direction. As shown in FIG. 5, in the longitudinal section in the width direction of the vehicle body, the intermediate portions 10m and 20m have a width at the lower portion larger than that at the upper portion and form a substantially isosceles triangle.

The top sides 10t and 20t of the front portions 10f and 20f approach the outer periphery of the airbag 1 toward the front in the plan view (FIG. 1). The first surfaces 11, 21 of the front portions 10f, 20f are inclined so that the farther away from the occupant's head H, the higher the height.

The first surfaces 11 and 21 of the first inflatable portion 10 and the second inflatable portion 20 intersect at the front portion of the airbag 1, and the intersecting portion forms a valley 1v extending in the front-rear direction. there is

The third inflatable portion 30 has a rear surface 31 on the occupant side and a front surface 32 on the side opposite to the occupant, ie, the front side. The rear surface 31 and the front surface 32 intersect at the left side, the right side, and the bottom side of the third expansion portion 30 . The upper portion of the rear surface 31 continues to the lower portions of the first surfaces 11, 21 of the front portions 10f, 20f. The upper portion of the front surface 32 continues to the lower portions of the second surfaces 12, 22 of the front portions 10f, 20f.

The third expansion part 30 has a tether (not shown) for keeping the expansion thickness, that is, the distance between the rear surface 31 and the front surface 32 at a predetermined distance, and for making the main part (other than the side part and the lower part) of the rear surface 32 planar. ) is provided.

A vent hole (not shown) is provided at any part of the airbag 1 .

The ends of gas introduction pipes (not shown) are inserted into the rear portions of the first inflatable portion 10 and the second inflatable portion 20 .

The airbag 1 configured in this way is folded and housed in a retainer (not shown). An inflator is installed in the retainer, and gas can be introduced into the airbag 1 through the gas introduction pipe.

A retainer containing the airbag 1 is installed in the upper portion of the seat back S and covered with a seat back covering material. The seatback surface material is provided with a tearable slit (not shown) that is torn apart when the airbag 1 is inflated.

When an automobile collision, overturn, or the like is detected, the inflator is activated and the airbag 1 starts to inflate. The airbag 1 pushes through the tearable slit and is first inflated and deployed from the upper portion of the seat back S. Next, the first and second inflatable portions 10 and 20 inflate and deploy forward above the occupant's head H, and then the third inflatable portion 30 inflates and deploys downward in front of the occupant's head H. Simultaneously with this, or before or after that, the first and second inflatable parts 10 and 20 come down to the sides of the head H.

The final deployed shape of the airbag 1 is as shown in FIGS. The third inflation portion 30 of the airbag 1 having this final deployed shape is positioned in front of the occupant P's chest. Since the main portion of the rear surface 31 of the third inflatable portion 30 has a planar shape facing the occupant's chest, the contact area with the chest increases and the load is dispersed. The first and second inflatable portions 10 and 20 pass through both the left and right sides of the occupant's head H to connect the third inflatable portion 30 and the upper portion of the seatback S. In this embodiment, the front portions 10f and 20f of the first and second inflation portions 10 and 20 are positioned diagonally in front of the occupant's head H on the left and right sides.

In the event of a frontal collision of the vehicle, the head H of the occupant P is restrained by the front portions 10f and 20f near the valley 1v, and the chest is restrained by the third expansion portion 30. As shown in FIG.

In the event of an offset collision or oblique collision of the automobile, the occupant's head H is restrained by the front portion 10f or 20f, and the chest is restrained by the third expansion portion 30. As shown in FIG. In this manner, the occupant's head H is restrained by the single airbag 1 even in the case of an offset collision or an oblique collision of the automobile. In addition, the occupant's head moves obliquely forward in an offset collision or oblique collision. Since the front portions 10f and 20f extend in the oblique direction with respect to the longitudinal direction of the vehicle body, the occupant's head H is restrained so as to substantially face the front portion 10f or 20f.

The above-described embodiment is an example of the present invention, and the present invention may be implemented in aspects other than those shown in the drawings. For example, the airbag 1 does not have an overhead inflatable portion that covers the upper side of the occupant's head H, but such an inflatable portion may be provided. Further, in the present invention, the airbag may be installed so as to inflate and deploy from the headrest or the interior member behind the seat back.

1 airbag 10 first inflatable portion 20 second inflatable portion 30 third inflatable portion 10f, 20f front portion 10m, 20m intermediate portion 10t, 20t top side 11, 21 first surface 12, 22 second surface

Claims (3)

An airbag that inflates and deploys from a seat back, a headrest, or an interior member behind the seat back of an automobile seat to restrain an occupant of the seat,
The airbag includes first and second inflatable portions that inflate and deploy on both sides of the occupant's head, and a third inflatable portion that inflates and deploys in front of the occupant's chest. In the airbag connected to the front part of the first and second inflatable parts,
front faces of the first expansion portion and the second expansion portion facing the occupant are triangular in plan view,
An airbag, wherein a main portion of the rear surface of the third inflatable portion is planar. each of the first and second bulging portions has an intermediate portion between the rear end and the front portion;
2. The airbag according to claim 1, wherein the intermediate portion has a width at the lower portion larger than that at the upper portion in a longitudinal section in the width direction of the vehicle body. An occupant restraint system comprising the airbag according to claim 1 or 2 and an inflator for inflating the airbag.

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