JPH1143002A - Air bag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air bag device which surely enters space between a breast of a occupant and a side wall of a cabin at the time of side collision, sufficiently eliminates secondary collision energy between the occupant and the side wall, and can be formed with a little base material. SOLUTION: An air bag 25 is composed of a bag main body 32 and a regulation part 33. The bag main body 32 is formed into substantially an L-shape composed of a head support part 30 and a breast support part 31. The regulation part 33 guides the gas G blown from an inflator 21 arranged on an introduction part 24 to the side of the head support part 30. The regulation part 33 is so arranged on the bag main body 32 as to show a specified angle in respect to a blowing direction from the inflator 21, suitably for introducing the gas G to the side of the head support part 30. Both ends of the bag main body show clearances of 50 to 100 mm, preferably 80 mm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag device which is inflated instantaneously to protect an occupant of a vehicle when the vehicle collides, particularly when another vehicle collides with a side surface of the vehicle, that is, in a so-called side collision.

[0002]

2. Description of the Related Art As such a conventional airbag device,
For example, there is one shown in US Pat. No. 5,586,782.

[0003] The side airbag device (DUAL PRESSURE SIDE IMPACTAIR BAG) disclosed in the above publication usually has an airbag folded and housed in a case body in a seat back. At the time of the collision, the gas generated from the inflator is expanded by introducing the gas from the gas outlet, the lid of the case body is pushed open and swells toward the front side, and expands in the space between the occupant and the side wall of the passenger compartment, The airbag absorbs the impact when the occupant makes a secondary collision with the side wall of the vehicle interior.

[0004] In an airbag, a bag main body having a substantially L-shape formed by a head support portion and a chest support portion is provided with a gas passage to the head support portion and a gas passage to the chest support portion by a divided plate or a seam. The gas blown out from the inflator is filled in each support portion in a short time.

[0005] The secondary collision behavior of an occupant during a side collision is such that the chest is hit against the side wall of the passenger compartment and the head is hit against the side wall of the passenger compartment like a whip around the waist. And so on.

[0006]

However, in the structure of such a conventional airbag device, the gas blown out from the inflator flows in parallel to the head support and the chest support, respectively. The airbag may not be fully inflated while the chest is moving, and the airbag may not enter between the chest and the side wall of the vehicle interior.

The present invention has been made in consideration of the conventional problems as described above. The present invention reliably enters between the chest of the occupant and the side wall of the passenger compartment in the event of a side collision, and causes the occupant to enter the passenger compartment side wall. An object of the present invention is to provide an airbag device which can sufficiently absorb secondary collision energy and can be formed without using a large amount of base material of the airbag.

[0008]

In order to achieve the above object, according to the first aspect of the present invention, an inflator is arranged so as to face a gas introduction portion to an outlet of a cylindrical holder housed therein. An airbag device comprising at least a bag-shaped airbag which is normally folded and inflatable by gas ejected from the inflator, wherein the airbag is substantially L-shaped at a head support portion and a chest support portion. A bag body formed in a U-shape, and a regulating portion for guiding gas ejected from an inflator provided in the introduction portion to the head support portion side, and the regulating portion is provided with a The bag body is disposed at a predetermined angle to guide the gas toward the head support with respect to the jetting direction, and both sides of the bag body are interposed so as to be spaced by a predetermined dimension. The features.

According to a second aspect of the present invention, in the airbag device according to the first aspect, the bag body is formed in a two-bag shape with a head support portion and a chest support portion, and the two bags communicate with each other. The through hole is formed on the side guided by the regulating portion.

According to a third aspect of the present invention, there is provided the airbag apparatus according to the first or second aspect, wherein the distance between both sides of the bag body is 50 to 100 mm, preferably 80 mm, due to the restricting portion. It is characterized by.

According to a fourth aspect of the present invention, there is provided the airbag apparatus according to any one of the first to third aspects, wherein the restricting portion is elongated from the introduction portion toward the head support portion. It is characterized by being formed.

According to a fifth aspect of the present invention, there is provided the airbag apparatus according to the fourth aspect, wherein a plurality of the regulating portions are arranged in a direction perpendicular to a streamline from the introduction portion side to the head support portion side. It is characterized by being done.

[0013]

According to the first aspect of the present invention, by igniting the inflator and ejecting gas from the ejection port of the holder, the chest support portion of the normally folded bag body is first inflated and then inflated. Since the gas can be guided to the head support portion by the restricting portion, the chest support portion first reliably enters between the occupant's chest and the cabin side wall at the time of a side collision, and the occupant enters the occupant's side wall inside the cabin. The secondary collision energy can be sufficiently absorbed.

Further, since the regulating portion is interposed between the both sides of the bag body so as to be spaced by a predetermined dimension, it can be formed without using a large amount of airbag base material. The reduction can be achieved.

According to the second aspect of the present invention, the bag main body is formed in a two-bag shape by the head support portion and the chest support portion, and the through hole communicating between the two bags is formed by the through-hole. Since it is formed on the side guided to the regulating portion, the gas is first guided to the side not guided, so that the expansion time of the chest support portion is short, and the gas is guided to the regulating portion after the chest support portion expands. As a result, the gas is quickly guided into the bag on the side of the head support.

According to the third aspect of the present invention, the distance between the two sides of the bag body, that is, the size of the restricting portion is 50 to 10 mm.
Since it is 0 mm, preferably 80 mm, the required amount of the base cloth itself when sewing the base cloths on both sides of the bag body directly to each other only needs to be substantially on the side, so that it can be formed with a small amount, and the manufacturing cost can be reduced. Can be reduced.

According to the fourth aspect of the present invention, the restricting portion includes:
Since it is formed in a long shape from the introduction portion side toward the head support portion side, the gas ejected from the inflator,
It can quickly flow along the length of the regulating part,
The inflated state that can protect the occupant can be quickly achieved.

According to the fifth aspect of the present invention, the regulating portion is
Since a plurality of gas turbines are arranged in a direction perpendicular to a streamline extending from the introduction portion side to the head support portion side, the gas ejected from the inflator is moderately rectified and sealed in the head support portion side. become.

[0019]

1 to 5 show an embodiment of the present invention. As shown in FIGS. 1 and 2, a seat 1 is composed of a seat back 2 and a seat cushion 3. The back 2 is disposed at a position facing the interior side wall 4. As is well-known, the upper side wall 4 is formed from the waistline 5 to the lower part 6 near the side sill, and the armrest part 7 protrudes toward the seat back 2 at a substantially middle position in the upper and lower directions. The arm can be supported. Reference numeral 8 denotes a headrest, and reference numeral 9 denotes a reclining device.

As shown in FIG. 3, the seat back 2 includes a seat back frame 10, a cushion pad 11 disposed on a front side FR of the seat back frame 10, and a side SD of the seat back frame 10. , A slab urethane cushioning member 13 arranged on the front side FR of the cushion pad 11, and a first skin 14 covering the cushioning member 13.
And a second skin 15 covering the side cushion 12,
An airbag device 16 disposed between a side portion of the cushion pad 11 and an inner surface portion of the side cushion 12 by means described later, and the first skin 14 and the second skin 1
5 is sewn to the second skin 15 and the bead 18 while the other is fixed to the seat back frame 10 while the bead 18 is interposed when the 5 is sewn so as to be cleavable (referred to as a cleave portion 17). Thus, the cloth-like protection member 19 for protecting the side cushion 12 is provided.

The airbag device 16 has a cylindrical holder 22 in which an inflator 21 that can be ignited by a signal from a sensor (not shown) or the like is housed, and an introduction portion 24 faces an outlet 23 of the holder 22. Airbag 25 which is arranged so as to be normally folded and can be inflated by gas ejected from the inflator 21;
A case body 27 covers the holder 22 and the airbag 25 and has an opening 26 that can be cleaved by the inflation of the airbag 25.

The holder 22 is provided on the side surface 10a of the seat back frame 10 with a nut 29 screwed into a bolt 28 inserted together with the folded end of the introduction portion 24 of the airbag 25. At this time, the holder 22
Is disposed so as to face the front side FR.

The airbag 25 has a bag body 3 formed substantially in an L shape by a head support 30 and a chest support 31.
2 and a regulating portion 33 for guiding the gas G blown out from the inflator 21 provided in the introduction portion 24 to the head support portion 30 side.

The restricting portion 33 is provided at a predetermined angle for guiding the gas G toward the head support portion 30 with respect to the direction in which the inflator 21 blows out, that is, at an angle of 45 degrees with respect to the horizontal line. Both sides 34a, 3 of the cloth 34
The end portions 33a and 33b are arranged on 4b by sewing.

The length of the restricting portion 33 is such that the side portions 34a and 34b of the base cloth 34 of the bag body 32 are spaced from each other by a predetermined size, that is, 50 to 100 mm, preferably 80 mm. It becomes.

The head support portion 30 and the chest support portion 31 of the bag body 32 are formed in a two-bag shape with a partition wall 35, and a through hole 36 communicating between the two bags is guided to the regulating portion 33. Formed on the partition wall 35 on the side to be formed.

The restricting portion 33 is formed in an elongated shape from the introduction portion 24 side to the head support portion 30 side.

As described above, since the embodiment of the present invention is constituted, the inflator 21 is ignited by a certain signal and the gas G is discharged from the ejection port 23 of the holder 22 by a white arrow as shown in FIG. As shown in the figure, the jet outlet 23 is disposed facing the front side FR, and furthermore, the inner side SN is prevented from moving further inward by the side surface 10a of the seat back frame 10 and the outer side SD.
The opening 26 of the case main body 27 is extended to a position on the front side of the front surface 10b of the seat back frame 10, so that further outward movement is prevented. The bag body 32 of the airbag 25 which is normally folded, in particular, the chest support portion 31 is quickly inflated toward the front FR of the vehicle by the gas G blown out from the inflator 21, and the airbag 25 is inflated.
The opening 26 of the case body 27 that covers the airbag 25 is opened, and the bag body 32 of the airbag 25 further inflates through the opening 26.

That is, the chest support portion 31 of the bag body 32 which is normally folded is inflated first, and then the gas G can be guided toward the head support portion 30 by the restricting portion 33. The occupant's chest and the cabin side wall 4
The chest support portion 31 can surely enter between the vehicle and the vehicle, and can sufficiently absorb the secondary collision energy of the occupant against the side wall 4 in the passenger compartment.

The restricting portion 33 is formed such that both side portions 34a and 34b of the base cloth 34 of the bag body 32 have predetermined dimensions, that is,
Since it is interposed so as to have an interval of 0 to 100 mm, preferably 80 mm, the base cloth 34 of the bag body 32 is formed.
Can be formed without using a large amount of the above material, so that the cost can be reduced.

The bag body 32 is connected to the head support 3
0 and the chest support portion 31 are formed in two bags,
Since the through hole 36 communicating the partition 35 between the two bags is formed on the side guided by the regulating portion 33, first, the gas G is guided to the side not guided, so that the chest supporting portion 31 is formed. The inflation is short, and after the chest support 31 is inflated, the gas G is quickly guided into the bag on the side of the head support 30 by the guide 33.

Since the restricting portion 33 is formed in a long shape from the introduction portion 24 side toward the head supporting portion 30 side, the gas G which is ejected from the inflator 21 as a fluid is regulated. The air can flow quickly along the length of the portion 33, and can be quickly brought into the inflated state where the occupant can be protected.

The airbag 25 does not inflate outward but inflates to the front side FR to cleave the cleavage portion 17 between the cushion pad 11 and the side cushion 12 of the seat back 2, as shown in FIGS. 6 to 8. Bulges out of the seat back 2.

At this time, the bag body 32 of the airbag 25
Is moved only to the outside, that is, to the front side FR, and the bag body 32 of the airbag 25 does not interfere with the armrest portion 7 disposed outside, that is, to the left and right sides, and the occupant's chest and the side wall of the vehicle interior remain as it is. Since the chest support portion 31 of the bag body 32 of the airbag 25 can enter between the airbag 4 and the airbag 25, the secondary collision energy of the occupant against the side wall 4 in the vehicle interior can be sufficiently absorbed.

FIG. 9 shows another embodiment of the present invention, which is another example of the bag body 32 of the airbag 25.
A plurality of regulating portions 37 are provided in a direction perpendicular to the streamline of the gas G flowing from the introduction portion 24 side to the head support portion 30 side. Since a plurality of gas G are arranged in a direction perpendicular to the streamline of the gas G directed to the support part 30 side, the gas G ejected from the inflator 21 is moderately rectified and sealed in the head support part 30 side. become.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a seat on which an airbag device according to an embodiment of the present invention is mounted.

FIG. 2 is a front view of FIG.

FIG. 3 is a sectional view taken along line SA-SA of FIG. 2;

FIG. 4 is a plan view of a single bag body of the airbag of FIG. 3;

FIG. 5 is a sectional view taken along the line SC-SC of FIG. 4;

FIG. 6 is a perspective view showing a state where the airbag is inflated from the state of FIG. 1;

FIG. 7 is a front view of FIG. 6;

FIG. 8 is a sectional view taken along line SB-SB in FIG. 7;

FIG. 9 is a plan view of a bag body of an airbag device according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seat 2 Seat back 4 Car side wall 7 Armrest part 10 Seat back frame 16 Airbag device 17 Cleavage part 21 Inflator 22 Holder 23 Spout port 24 Introducing part 25 Airbag 26 Opening 27 Case main body 30 Head support 31 Chest Supporting part 32 Bag body 33, 37 Regulatory part

Claims (5)

[Claims] 1. A bag-like shape in which an inflator is arranged so as to face a gas introduction portion to an ejection port of a cylindrical holder accommodated therein and is normally folded and can be inflated by gas ejected from the inflator. An airbag device comprising at least the airbag of the above, wherein the airbag is disposed in a bag body formed substantially in an L shape by a head support portion and a chest support portion, and the introduction portion. A restricting portion for guiding the gas ejected from the inflator to the head support portion side, the restricting portion having a predetermined angle for guiding the gas toward the head support portion side with respect to the direction of ejection from the inflator. An airbag device characterized in that the airbag device is disposed in the bag body with the airbag and the both sides of the bag body are interposed so as to be spaced by a predetermined dimension. 2. The airbag device according to claim 1, wherein the bag body is formed in a two-bag shape with a head support portion and a chest support portion, and a through hole communicating between the two bags is provided. An airbag device formed on a side guided by the regulating portion. 3. The airbag device according to claim 1, wherein the distance between both sides of the bag body is 5 due to the restricting portion.
An airbag device characterized by having a diameter of 0 to 100 mm, preferably 80 mm. 4. The airbag device according to claim 1, wherein the restricting portion is formed in an elongated shape from the introduction portion side to the head support portion side. An airbag device characterized by the above. 5. The airbag device according to claim 4, wherein a plurality of the regulating portions are provided in a direction perpendicular to a streamline from the introduction portion side to the head support portion side. Characteristic airbag device.