JPH1142999A - Air bag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently absorb the secondary collision energy to a side wall, of an occupant even when an armrest part is protruded by arranging an inflator on the side surface of a seat back frame with the injection port situated in the front, and forming an opening part on the front end part of the outer side wall of a case body extended to the front side of the seat back frame. SOLUTION: This air bag device is formed of a cylindrical holder 22 for housing an inflator 21, an air bag body 25, and a case body 27 having a cleavable opening part 26. The injection port 23 of the holder 22 is arranged forward. A lid part 30b is integrally formed on the inside wall 30 of the case body 27 through a thin hinge. The air bag body 24 can be swollen only to the front side and fitted between an occupant and the cabin inside wall without being interfered with an armrest part by arresting the inward movement by the side surface 10a of the seat back frame 10, extending the opening part 26 to the front side from the front surface 10b of the seat back frame 10, and extending a reinforcing member 19 from an outside wall 32.

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, JP-A-8-244552 and JP-A-9-76
There is one as shown in Japanese Patent Publication No. 865.

In the side collision airbag device disclosed in the former publication, the airbag body is normally folded and housed in the case body in the seat back. The airbag body is inflated by introducing the gas generated from the gas outlet, the lid of the case body is pushed open and swells toward the front side, and is deployed in the space between the occupant and the side wall of the passenger compartment. The bag body absorbs the impact when the occupant makes a secondary collision with the side wall of the vehicle interior.

In the side collision airbag device disclosed in the latter publication, the airbag body is normally folded and housed in the case body in the seat back. The bag body is inflated by the inflator, the lid expands outward from the front side of the seat back to the rear side of the seat back, and the airbag body expands out of the case body between the inside of the vehicle and the occupant side. ing.

[0005]

As described above, in the structure of the conventional airbag device, as described as "pushing and opening the lid" or "the lid is expanded outward". The structure in which the lid once expands outward is an essential structure.

However, as is well known, the upper side of the vehicle interior is not flat from the waist line to the lower side near the side sill, but an armrest portion protrudes toward the occupant at a substantially middle position in the vertical direction to support the occupant's arm. It has a possible structure.

In other words, the space between the side of the seat back and the side wall of the vehicle interior, which is sufficient to push and open the lid, is actually divided up and down by the armrest portion.

Further, in order to prevent the armrest from being vertically divided by the armrest, the amount of protrusion of the armrest is extremely reduced so that the supportability of the occupant's arm is reduced, or the side of the seat back is reduced. It is necessary to provide a means for preventing the airbag body from being vertically divided by making the left and right widths of the seat back extremely small by making the airbag body extremely far from the side wall of the vehicle interior and making the comfortability worse.

Further, if the armrest portion is sufficiently protruded so as not to impair the supportability of the occupant's arm, the inflated airbag body enters under the armrest portion and cannot protect the occupant's chest and head. There is fear.

The present invention has been made in consideration of the conventional problems as described above. Even when the armrest portion is sufficiently protruded from the side wall of the vehicle interior, the armrest portion enters between the occupant and the side wall of the vehicle interior, and the occupant's occupant enters the space. It is an object of the present invention to provide an airbag device that can sufficiently absorb secondary collision energy to a vehicle interior side wall and does not impair the livability as a seat back.

[0011]

In order to achieve the above-mentioned object, a first aspect of the present invention is directed to a cylindrical holder in which an inflator is housed, and a gas introducing portion facing an outlet of the holder. And an airbag body which is normally folded and is inflatable by the gas ejected from the inflator, and an opening which covers the holder and the airbag body and which can be torn by expansion of the airbag body. Wherein the inflator is disposed on a side surface of a seat back frame, and a discharge port is disposed facing forward, and an opening of the case main body is provided with the seat back frame. The case body is formed at a front end of an outer wall of the case body extending to a position on the front side.

According to a second aspect of the present invention, there is provided the airbag apparatus according to the first aspect, wherein the outer wall and the inner wall of the case body are integrally formed by a thin hinge, and the outer wall has strength means. Is provided, and the opening is configured such that an opening end of the inner wall is detachably engaged with a front end of the outer wall.

According to a third aspect of the present invention, there is provided the airbag device according to the first or second aspect, wherein an opening end of the inner wall is formed in a planar shape facing a discharge port of the inflator. It is characterized by.

According to a fourth aspect of the present invention, there is provided the airbag device according to any one of the first to third aspects, wherein the opening end of the inner wall is 45 to 75 degrees with respect to the general surface of the outer wall. Is formed at an angle that forms

According to a fifth aspect of the present invention, in the airbag apparatus according to any one of the first to fourth aspects, the strength means includes a seat on an outer wall extending from the inflator support to the opening end. It is characterized in that a reinforcing member connected to the cleavage portion of the back is provided alongside.

According to a sixth aspect of the present invention, in the airbag device according to any one of the first to fifth aspects, a portion of the inner wall that does not come into contact with the seatback frame is provided at the opening end side. It is characterized in that the ribs are cross-linked.

[0017]

According to the first aspect of the present invention, when the inflator is ignited and gas is ejected from the ejection port of the holder, the ejection port is disposed to face the front side and the inside of the vehicle is the side of the seat back frame. In addition, the opening of the case body arranged outside the vehicle is extended to a position on the front side of the seat back frame, so that the normally folded airbag body is caused by gas ejected from the inflator. Inflating toward the front side of the car, the inside of the opening of the case body covering the airbag body is torn open, and the airbag body further inflates through the opening,
Even if the armrest portion is formed on the side wall of the vehicle interior, the airbag body enters between the occupant and the side wall of the vehicle interior without being affected by the armrest portion, and the secondary collision energy of the occupant against the side wall of the vehicle interior is reduced. Can absorb enough.

Further, since the opening of the case main body is extended to a position on the front side of the seat back frame, the case main body does not give a feeling of foreign matter to the back of the seated occupant, thereby improving the livability as a seat back. There is no loss.

According to the second aspect of the present invention, since the outer wall and the inner wall can be opened by the thin hinge of the case body, when the case body is a single body, the holder and the airbag body including the inflator are provided. Can be opened with the thin hinge at the center, thereby improving workability.

Further, since the outer wall of the case body is reinforced by the strength means, the outer wall is hardly deformed even if the pressure due to the expansion of the airbag body is applied to the outer wall, and the airbag body is moved outward. It will not expand.

Since the opening of the case body is located at the front end of the outer wall, the pressure when the airbag body is inflated is applied to the opening end of the inner wall, and the engagement of the two ends is achieved. Can be easily separated.

According to the third aspect of the present invention, since the opening end of the inner wall is formed in a planar shape facing the ejection port of the inflator, the pressure when the airbag body inflates is reduced. All the pressure is applied to the opening end side of the inner wall, and no pressure loss occurs.

According to the fourth aspect of the present invention, the opening end of the inner wall is formed at an angle of 45 to 75 degrees with respect to the general surface of the outer wall. Even if it is supported by the back, the shape follows the inclination of the occupant's back, and the occupant does not feel foreign matter.

According to the fifth aspect of the present invention, the strength means is such that a reinforcing member connected to a split portion of a seat back is provided along an outer wall from the inflator support to the opening end. Therefore, no outward movement of the outer wall can occur.

According to the sixth aspect of the present invention, a portion of the inner wall that does not contact the seatback frame is formed by bridging a rib toward the opening end, so that the inner wall has an initial shape. Will have good shape retention.

[0026]

1 to 5 show an embodiment of the present invention. As shown in FIGS. 1 and 2, a seat 1 comprises a seat back 2 and a seat cushion 3, and 2 is arranged at a position facing the vehicle 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). Thereby, the cloth-like reinforcing 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) is housed, and an introduction portion 24 faces an outlet 23 of the holder 22. Airbag body 25 which is arranged in such a manner that it is normally folded and can be inflated by gas ejected from the inflator 21
And a case body 27 that covers the holder 22 and the airbag body 25 and has an opening 26 that can be cleaved by the inflation of the airbag body 25.

The holder 22 is provided on the side surface 10 a of the seat back frame 10 with the introduction portion 24 of the airbag body 25.
And a nut 29 screwed into a bolt 28 inserted together with the folded-back end. At this time, the ejection port 23 of the holder 22 is arranged facing the front side FR.

As shown in FIGS. 3 to 5, the case body 27 includes an inner wall 30 disposed on the side surface 10a of the seat back frame 10, a holder 22, and the airbag body 2.
An outer wall 32 arranged on the side cushion 12 side via a space 31 in which the reinforcing member 19 is provided and the reinforcing member 19 is arranged along with a ceiling member 3 connecting the side walls 30, 32.
3 and a floor member 34.

The inner wall 30 includes a base 30 a surrounding the holder 22 together with the outer wall 32, and a thin hinge 35.
Lid part 3 formed integrally with the base part 30a through
0b.

As shown in FIG. 4, the lid portion 30b includes a first surface 30ba formed at a predetermined distance on an extension of the base portion 30a, and a bent portion 30bb of the first surface 30ba.
From the front surface 32a of the outer wall 32 at a predetermined angle 、, in other words, the general surface 3 of the outer wall 32.
The second surface 30 is changed according to a change in the surface shape of the seat back 2 on the occupant occupancy side between 45 and 75 degrees with respect to 2c.
bc and a plurality of engagement holes 32 formed in the front end 32a of the outer wall 32 from the bent portion 30bd of the second surface 30bc.
b has a free end 30be having a claw portion 36 which can be engaged and disengaged.
And upper and lower flanges 30bf, 30b of the lid portion 30b.
g.

Therefore, the planar portion of the inner wall 30 facing the ejection port 23 of the holder 22 is the second surface 30b
c and the free end 30be, which are described as "open ends".

Reference numeral 30bh denotes a rib formed by bridging a portion of the first surface 30ba that does not contact the side surface 10a of the seat back frame 10 and the second surface 30bc.

As shown in FIG. 3, the outer wall 32 extends from the front surface 10b of the seat back frame 10 to a position on the front side FR by a predetermined dimension.
c and a plurality of ribs 37 formed on the general surface 32c at a plurality of intervals.

Claw member 3 formed on floor member 34
8 is an engagement hole 39 formed in the lid portion 30b.
, The engaging force of the opening 26 is further increased.

As described above, since the embodiment of the present invention is constituted, the inflator 21 is ignited by a certain signal, and gas is emitted from the ejection port 23 of the holder 22 by a white arrow as shown in FIG. Squirt like so.

The outlet 23 is disposed facing the front side FR, and the vehicle interior SN is connected to the seat back frame 1.
0 is prevented from moving further inward, and the opening 26 of the case body 27 disposed on the vehicle outside SD, that is, the front end 3 of the outer wall 32.
2a is extended to a position on the front side of the front surface 10b of the seat back frame 10 and the reinforcing member 19 is provided along the outer surface of the outer wall 32, so that it is normally folded. Airbag body 25
However, even if it is inflated by the gas ejected from the inflator 21, it is prevented from moving outward beyond the position where the outer wall 32 is disposed.

Then, the airbag body 25 is quickly inflated toward the front side FR of the vehicle, and the airbag body 25 is inflated.
From the position shown by the two-dot chain line,
The claw portion 36 of the lid portion 30b is connected to the front end portion 32 of the outer wall 32.
8A, by being disengaged from the engagement hole 32b, the outer wall 32 is torn by bending from the corner between the side surface 10a and the front surface 10b of the seat back frame 10, as indicated by the black arrow in FIG. The airbag body 25 further inflates through the opening 26.

That is, the airbag body 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, and FIGS. As shown in FIG. 8, the airbag bulges out of the seat back 2, that is, the front side FR.

At this time, the airbag body 25 is
The airbag body 25 does not interfere with the armrest portion 7 disposed on the outside, and the airbag body 25 can directly enter between the occupant and the side wall 4 in the vehicle interior. It is possible to sufficiently absorb the secondary collision energy of the occupant on the side wall 4 of the vehicle interior.

When the airbag body 25 has a shape as shown in FIGS. 9 and 10, that is, the airbag body 25 itself is substantially L-shaped, and
Is bent at a right angle in the first bag 25a on the side closer to, and a bridging member 40 for guiding the gas (indicated by an arrow) of the inflator 21 is provided in the bent portion, and communicates with the second bag 25b through the partition 41 having the fine holes 41a. If so, as shown in FIG.
The inflated airbag body 25 can protect the occupant's chest and head.

The case body 27 is made of a thin hinge 3.
5, the outer wall 32 and the inner wall 30 can be opened. When the case main body 27 is a single body, as shown by a two-dot chain line in FIG. 30b can be opened, so that the holder 22 including the inflator 21 and the airbag body 2
5 can be installed in the case body 27,
Workability is improved.

The outer wall 32 of the case body 27
Is reinforced by being provided along the reinforcing member 19 as a strength means, so that even if pressure due to inflation of the airbag body 25 is applied to the outer wall 32, the outer wall 32 moves outward. This cannot occur at all, that is, the outer wall 32 itself does not deform, and the airbag body 25 does not expand outward.

Since the opening 26 of the case main body 27 is located on the front end portion 32a side of the outer wall 32, the pressure when the airbag main body 25 is inflated causes the second surface of the lid portion 30b of the inner wall 30 to be inflated. 32bc and the free end 32be side, and the engagement of the both ends 32a, 32be can be easily disengaged.

Since the second surface 32bc and the free end 32be of the lid portion 30b of the inner wall 30 are formed in a shape facing the ejection port 23 of the holder 22, the inflation of the airbag body 25 is achieved. When the pressure is applied, the second surface 32bc of the lid portion 30b of the inner wall 30 and the free end 3
The pressure is applied to all the 2be sides, and no pressure loss occurs.

As shown in FIG. 3, when the airbag body 25 is normally folded, the case body 2 is closed.
7, that is, only the front end 32 a of the outer wall 32 extends to a position on the front side of the seat back frame 10, in other words, the inner wall 30 side is the front end of the outer wall 32. By being behind 32a, the case main body 27 does not give a foreign body feeling to the back of the seated occupant, and does not impair the livability as the seat back 2.

Furthermore, even if the airbag device 16 is supported by the seat back 2, the lid 3
0b is the second surface 32bc of the outer wall 32.
By being formed at an angle of 45 to 75 degrees with respect to c, the shape conforms to the inclination of the occupant's back, and the occupant does not feel a foreign object.

Further, a portion of the inner wall 30 which does not come into contact with the seat back frame 10, ie, a first surface 30ba
The rib 30bh is bridged toward the opening end portion between the front side and the second surface 30bc.
0 means that the shape retention of the initial shape is good.

The rib 37 extends from the portion of the case body 27 supporting the inflator 21 to the opening 2.
It is formed on the inner surface of the outer wall 32 toward 6, but may be omitted.

[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 cross-sectional view of the single case body of FIG. 3;

FIG. 5 is a perspective view of the case main body of FIG. 4 as viewed from an opening side.

FIG. 6 is a perspective view showing a state in which the airbag body is inflated from the state of FIG.

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 side view of the airbag body.

FIG. 10 is a sectional view taken along the line SC-SC in FIG. 9;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 seat 2 seat back 4 side wall of vehicle interior 7 armrest portion 10 seat back frame 10 a side surface of seat back frame 10 b front surface of seat back frame 16 airbag device 17 cleavage portion 19 reinforcing member 21 inflator 22 holder 23 ejection port 24 introduction portion 25 Airbag main body 26 Opening 27 Case main body 30 Inner side wall 30b Lid part 30ba First surface 30bc Second surface 30be Free end 30bh Rib 32 Outer side wall 32a Front end 32b Engagement hole 32c General part 35 Thin hinge 36 Nail

Claims (6)

[Claims] A tubular holder in which an inflator is housed, and which is arranged so as to face a gas introduction portion to an outlet of the holder and is normally folded and expanded by gas ejected from the inflator. An airbag device comprising: a possible airbag body; and a case body that covers the holder and the airbag body and has an opening that is cleavable by inflation of the airbag body, wherein the inflator is a seatback frame. The case body is disposed on the side surface, and the ejection port is disposed facing the front side. The opening of the case main body extends to a position on the front side of the seat back frame. An airbag device formed at a front end. 2. The airbag device according to claim 1, wherein the outer wall and the inner wall of the case body are integrally formed with a thin hinge, and a strength means is provided on the outer wall. The airbag device, wherein the opening has an opening end of the inner wall detachably engaged with a front end of the outer wall. 3. The airbag device according to claim 1, wherein an open end of the inner wall is formed in a planar shape facing an outlet of the inflator. Bag device. 4. The airbag device according to claim 1, wherein an opening end of the inner wall is formed at an angle of 45 to 75 degrees with respect to a general surface of the outer wall. An airbag device characterized by being made. 5. The airbag device according to claim 1, wherein the strength means is provided on an outer wall extending from the inflator support to the opening end, and on an open portion of the seat back. An airbag device, wherein a connected reinforcing member is provided alongside. 6. The airbag device according to claim 1, wherein a rib is bridged to a portion of the inner wall that does not contact the seatback frame toward the opening end. An airbag device characterized by being made.