JP7093811B2 - Airbag device - Google Patents

Description

In the present invention, for example, in the event of a vehicle collision, the head of an occupant seated on a vehicle seat, the side and front parts of the shoulder, upper arm, and chest of the occupant, and in some cases, the occupant. It relates to an airbag device that protects the abdomen and the sides of the waist.

Hereinafter, in the present application, "upper" and "upper" mean the head direction of the occupant seated in the seat in the normal state, and "lower" and "lower" mean the foot direction as well. Further, "front" and "front" mean the front direction of the occupant seated in the seat in the normal state, and "rear" and "rear" mean the back direction as well. In addition, "left" and "left" mean the left-hand direction of the occupant seated in the seat in the normal state, and "right" and "right" mean the right-hand direction as well. On the other hand, for example, in the flat position before folding the airbag in which the base cloth is sewn on the bag body, the direction in which the head protection chamber and the side protection chamber are lined up is the left-right direction, and is orthogonal to the left-right direction in the same plane. The direction to do is the vertical direction. The edge side on which the tab for attaching to the seat is provided means the "up" direction, and the opposite side means the "down" direction.

In recent years, for example, a hood-type (shell-shaped) airbag that has popped out of the seat when a vehicle collides covers the head of the occupant seated on the seat and the side parts of the occupant's shoulders, upper arms, and chest. An airbag device for protection has been proposed (for example, Patent Document 1).

In the case of the airbag device, for example, when the hood-type airbag expands and expands with the seat belt attached to the vehicle body set normally by the occupant seated on the seat, the airbag becomes the occupant's shoulder opening. It is desirable that it be sandwiched between the seat belts.

The reason is that when the relative positions of the airbag, seatbelt and occupant are in the above positional relationship, the amount of occupant's chest deflection due to the seatbelt decreases in the event of a frontal collision, and as a result, the occupant is satisfied with the restraint performance of the occupant. This is because the harmfulness (amount of chest deflection) can be reduced. The "chest deflection amount" refers to the relative displacement amount between the chest ribs and the spine, and is a value used as an evaluation index of chest injury in the offset frontal collision standard.

In addition, in the event of a diagonal collision, the seatbelt can act as a reaction force to the entire airbag, and the seatbelt works in a limited manner regardless of whether the occupant moves diagonally forward to the left or right, and the hood. It is possible to increase the binding force of the entire type airbag.

For example, in the case of an oblique collision, a seatbelt set through the shoulder opening of the far side of the occupant is ideal for the collision form of the far side. However, even in the case of a seatbelt set through the shoulder of the occupant's nearside, the nearside side of the airbag is restrained by the headrest and the upper end of the seat by the seatbelt, so that the farside side of the airbag is greatly deformed. Can be prevented. As a result, even in the case of a far-side collision, the occupant can be effectively protected by the seat belt passing through the occupant's near-side shoulder opening. When looking at one of the seats installed side by side in the width direction of the vehicle, the "far side" is the side far from the side door close to the occupant seated in the seat, and the "near side" is. , Refers to the side door side close to the occupant.

However, for example, in the event of a collision, an airbag that focuses on expanding and expanding with the hood-type airbag securely sandwiched between the shoulder of the occupant seated on the seat and the seatbelt in the normally set state. No device has been proposed at this time.

JP-A-2018-83554

The problems to be solved by the present invention are the following two points.
・ In the event of a collision (especially in a side collision or diagonal collision), the occupant seated in the seat reduces the amount of chest deflection applied by the seatbelt worn by the occupant, and directly from the occupant's head to the waist due to a side collision or the like. It was necessary to reduce the damage done at the same time.
・ In the case of a hood-type airbag that integrally covers the occupant's head seated on the seat to the side of the waist, in the event of a collision, between the occupant's shoulder and the seatbelt in the normally set state. It was necessary to inflate and deploy the airbag in a state where it was securely sandwiched.

The present invention solves the above-mentioned problems, and in the event of a collision, the hood type airbag is surely sandwiched between the shoulder opening of the occupant seated on the seat and the seat belt in the normal set state, and is expanded and expanded. I am aiming. By achieving this purpose, it is possible to reduce damage to the occupants due to seat belts other than airbags (for example, reduce the amount of chest deflection).

That is, the present invention is an airbag device including an airbag that integrally covers the head and sides of an occupant seated on a vehicle seat and an inflator that supplies gas to the airbag. The main feature is the composition of.

For example, the airbag in a flat position before being rolled or folded into a bellows has a plurality of longitudinally partitioned chambers, which are heads that cover the temporal region from the crown of the occupant. It has a section protection chamber and a side protection chamber that covers the sides of the occupant. The head protection chamber is arranged on the left-right central side of the airbag in the flat-laying state, and the side protection chambers are arranged on both sides in the left-right direction of the airbag in the flat-laying state. Further, the airbag has a plurality of tabs attached to the upper edge of the airbag when it is placed flat.

Then, the airbag is housed in a state of being rolled in a roll shape or folded in a bellows shape, for example, from one side portion of the backrest portion of the seat to the other side portion via the upper portion. Specifically, the pair of side protection chambers are housed in opposite positions on the left and right sides of the backrest of the seat separated in the vehicle width direction, and the head protection chamber is housed in the upper part of the backrest. The upper part of the backrest portion of the seat means the upper part of the headrest when the headrest is integrally formed.

By doing so, at the time of deployment, the head protection chamber jumps over the headrest from the upper part of the backrest of the seat, or expands and expands forward from the upper part of the backrest of the seat. On the other hand, the side protection chamber expands and expands forward from the left and right sides of the backrest of the seat.

At that time, the side protection chamber expands and expands between the seatbelt in the normal set state and the occupant, and a space can be formed between the airbag and the occupant which expands and expands at the position where the seatbelt passes. The airbag is configured in the air bag. Specifically, in the case of a seatbelt that passes through the shoulder opening on the near side of the occupant, the temporal region on the side door side of the occupant sitting in the normal position (or the upper end of the headrest on the side door side) and the side door on the shoulder. The airbag is configured so that the side protection chamber expands and expands with the upper end of the side (or the upper end of the backrest on the side door side) to form the space.

In the airbag device of the present invention having the above configuration, a space is formed between the neck of the occupant seated on the seat and the airbag expanded and deployed at the position where the seat belt passes. Therefore, even if the inflated and deployed airbag is pressed by the seatbelt in the worn state, the relative movement of the airbag with respect to the occupant becomes easy, and the inflated and expanded airbag covers the shoulder of the occupant. Can be done. Further, even when the seatbelt is tense, the expanded and expanded airbag is sandwiched between the occupant's shoulder and the seatbelt, and the seatbelt can be prevented from hitting the occupant's neck. Damage to the neck is reduced. At the same time, the inflated airbag causes the seatbelt to float at least near the upper part of the occupant's chest, while the lower part of the seatbelt can properly restrain the part below the occupant's abdomen. The amount of deflection is reduced. That is, it is possible to minimize unnecessary force applied to the occupant seated on the seat as a whole.

In the present invention, in order to form the space, the airbag is located so that the vicinity of the outlet of the gas ejected from the inflator to the side protection chamber is located at a position where the seat belt passes when the airbag is expanded and deployed. Is desirable to form. In order to obtain such a positional relationship, for example, the above-mentioned is applied to the upper edges of the airbags on the left and right sides of the inflator inserted into the upper edge of the airbag in a flat state before being rolled into a roll or folded into a bellows shape. You can attach the tabs and attach them to the seat with the stud bolts provided on these tabs and the inflator. As a result, a high gas pressure is applied to the area of the airbag between the occupant's shoulder and the seatbelt, and the airbag expands and expands while pushing up the seatbelt.

Further, in the present invention, in order to form the space, the side protection chamber has a shoulder-chest protection portion that covers the shoulder and chest of the occupant, and a waist protection portion that covers the waist of the occupant, and expands and expands. At the time, it is desirable to form the shoulder-chest protection portion at a position where the seat belt passes.

The shoulder-chest protection portion is located in front of the vehicle with the portion of the shoulder-chest protection portion through which the seatbelt passes so as to come into contact with the seatbelt and wrap around in front of the occupant during expansion and deployment. It is desirable to extend it (for example, downward in a flat state before rolling it into a roll or folding it into a bellows shape). With such a configuration, the range in which the airbag wraps around in front of the occupant becomes wider, and the restraint performance of the occupant is further improved.

In addition to the shoulder-chest protection portion, if the head protection chamber is also extended to the front of the vehicle (for example, below in a flat state before being rolled or folded into a bellows shape), the front of the occupant's head. Can also be covered with an airbag, further increasing the range of occupant restraint. In this case, the amount of movement of the occupant's chest is about the same as in the case of occupant restraint by the front airbag and the seat belt even without the front airbag.

In the present invention, since a space is formed between the neck of the occupant seated on the seat and the airbag expanded and expanded at the position where the seatbelt passes, the damage to the neck of the occupant by the seatbelt is reduced at the same time. , The amount of chest deflection is reduced. That is, it is possible to minimize unnecessary force applied to the occupant seated on the seat as a whole.

In the figure illustrating the airbag device of the present invention, (a) is a side view showing an example of the range covered by the airbag for an occupant seated on the seat, and (b) is a state after expansion and deployment of the airbag. It is the figure shown from the diagonally front left. It is a figure which showed the 1st Embodiment of the airbag of the airbag apparatus of this invention, for example, a flat state state before winding in a roll shape or folding in a bellows shape. It is a front view of the seatbelt wearing state of the occupant seated on the seat accommodating the airbag device of the present invention. After 20 ms, (c) shows after the expansion and deployment of the airbag. 15 ms after the start of expansion and deployment of the airbag of the airbag device of the present invention, the figure illustrating the space formed between the neck of the occupant seated on the seat and the airbag expanded and expanded at the position where the seat belt passes. It is a view seen from the front. It is a figure explaining the position where the seat belt which supports the occupant seated in the seat together with the airbag of the airbag device of this invention passes, and is the figure seen from the side. In the figure explaining the effect of the airbag device of the present invention at the time of a frontal collision, (a) shows only the front airbag and the seatbelt, and (b) shows the front airbag, the seatbelt and the airbag device of the present invention. It is the figure which showed 80ms after the start of expansion and deployment of the airbag in the case of the combined use. In the figure explaining the effect of the airbag device of the present invention at the time of a side collision, (a) is a case where there is no seatbelt, and (b) is a case where the seatbelt and the airbag device of the present invention are used in combination, respectively, in the lateral direction. It is the figure which showed the state which the occupant moved to. (A) is the same as FIG. 2 showing the second embodiment of the airbag of the airbag device of the present invention, for example, a diagram of a flat state before being rolled into a roll or folded into a bellows, (b). It is the figure which looked at the expansion and development state of the airbag shown in (a) from the front. (A) is the same as FIG. 2 showing the third embodiment of the airbag of the airbag device of the present invention, for example, a diagram of a flat state before being rolled into a roll or folded into a bellows, (b). It is the figure which looked at the expansion and development state of the airbag shown in (a) from the front. (A) is the same as FIG. 2 showing the fourth embodiment of the airbag of the airbag device of the present invention, for example, a diagram of a flat state before being rolled into a roll or folded into a bellows, (b). It is the figure which looked at the expansion and development state of the airbag shown in (a) from the front. (A) to (d) are diagrams illustrating a range in which the airbag of the airbag device of the present invention covers a side portion of an occupant.

In the event of a collision, the airbag device that focuses on expanding and deploying with the hood-type airbag securely sandwiched between the shoulder opening of the occupant seated on the seat and the seat belt in the normally set state is Not currently proposed.

In the present invention, in the event of a collision, the side protection chamber expands and expands between the seat belt with the side protection chamber set normally and the shoulder opening of the occupant seated on the seat, and a space is created between the shoulder opening of the occupant and the seat belt. The airbag is configured so that it can be formed. By doing so, the damage to the occupants by the safety device including the seat belt and the like is reduced (for example, the amount of chest deflection is reduced).

Hereinafter, examples of the present invention will be described with reference to FIGS. 1 to 11.
As shown in FIG. 1, the airbag device 11 has lateral and front parts such as the head 2a and the neck 2b, the shoulder 2c, the upper arm 2d, the chest 2e, and the waist 2f of the occupant 2 seated on the vehicle seat 1. It is provided with an airbag 12 that partially covers the air bag 12. The airbag 12 includes an inflator 13 that ejects gas inside the airbag 12, as shown in FIG. 2, which shows a flat state before being rolled into a roll or folded into a bellows shape, for example.

The vehicle seat 1 includes a seat cushion 1a and a backrest portion 1b, and the backrest portion 1b is integrally formed with a headrest 1c on the upper portion thereof (see FIG. 1A) or is separately attached. ing. The seat cushion 1a and the backrest portion 1b are supported by the frame 1d.

The inflator 13 is formed in a tubular shape and has a configuration in which gas is ejected from the outer surface thereof. For example, as shown in FIG. 2, one inflator 13 is provided on each of the left and right sides of the upper edge portion of the airbag 12 in a flat state. It is attached. For example, two stud bolts 13a are provided on the outer periphery of the inflator 13 in the axial direction of the inflator 13, and are attached to the vehicle seat 1 by these stud bolts 13a (see FIG. 1A).

As shown in FIG. 2, for example, the airbag 12 in the flat placement state has a shape that is longer in the left-right direction than in the up-down direction, and two identical sheets 12a and 12b are superposed on each other, and the outer peripheral portion and the inside are appropriately positioned. Is sewn to form an inflatable chamber 12c having the same shape on the left and right. 14 in FIG. 2 shows sewing of the outer peripheral portion.

The chamber 12c is divided into a head protection chamber 12ca located on the left-right central side of the airbag 12 in a flat position and a side protection chamber 12cc located on both sides of the airbag 12 in the left-right direction. Has been done. In this embodiment, the head protection chamber 12ca is formed by sewing 14 on the outer peripheral portion, sewing 15 continuous at the end on the left-right central portion side of the sewing 14, and sewing 16 independent of the sewing 14. is doing. Further, the side protection chamber 12cc is formed by the sewing 14 of the outer peripheral portion and the independent sewing 16.

The head protection chamber 12ca covers the temporal region from the crown of the occupant 2. Further, the side protection chamber 12cc covers the side portion of the occupant 2. In FIG. 2, the side protection chamber 12cc is the shoulder protection chamber 12cba adjacent to the head protection chamber 12ca, and the waist protection chamber 12cbb located on the opposite side of the shoulder chest protection chamber 12cba from the head protection chamber 12ca. Is divided by the sewing 16.

Further, in FIG. 2, by not connecting the end portion of the sewing 16 on the sewing 15 side with the sewing 14 on the outer peripheral portion, a vent 17 is formed between the head protection chamber 12ca and the side protection chamber 12cc. is doing. This vent 17 causes gas to flow from the side protection chamber 12cc to the head protection chamber 12ca when the expansion and deployment of the side protection chamber 12cc is completed, and supplements the supply of gas to the head protection chamber 12ca. be.

Further, in FIG. 2, the airbag 12 forms an insertion portion 12e of the inflator 13 at a line-symmetrical position of the upper edge portion of the left and right chambers 12c at the center in the left-right direction in the flat placement state. Then, the inflator 13 is inserted into these insertion portions 12e, and the gas is separately supplied from the inflator 13 to the left and right chambers 12c. Further, tabs 12f are attached to the left and right sides of each of the inflators 13 on the upper edge of the airbag 12 in the flat placement state, and by using these tabs 12f and the stud bolts 13a, the airbag 12 is a vehicle seat. Attached to 1 (see FIG. 1 (a)).

Further, in FIG. 2, a gas guide 18 formed in a substantially Y shape is provided in the accommodating portion of the inflator 13. The gas guide 18 has an inlet 18a into which the inflator 13 is inserted, a first outlet 18b for guiding the gas ejected from the inflator 13 to the side protection chamber 12cc, and a second outlet for guiding the gas ejected from the inflator 13 to the head protection chamber 12ca. It has 18c. The cross-sectional area of the first outlet 18b and the second outlet 18c is appropriately determined by the amount of gas supplied to the side protection chamber 12ca and the head protection chamber 12cc.

In the present invention, the airbag 12 is wound in a roll shape or bellows shape from one side of the backrest portion 1b of the seat 1 to the other side portion of the backrest portion 1b of the seat 1 via the upper part. Store in a folded state. Specifically, the head protection chamber 12ca is placed on the backrest portion 1b at a position where the pair of side protection chambers 12cc constituting the airbag 12 are separated from each other on the left and right sides of the backrest portion 1b of the seat 1 in the vehicle width direction. Each is housed in the upper part.

In the case of the airbag device 11 of the present invention in the contained state, for example, at the time of a collision, the gas ejected from the inflator 13 by the signal from the sensor causes the stored state of FIG. 3 (a) to be changed to FIGS. 3 (b) and 3 (c). As shown, the airbag 12 expands and expands. Specifically, the head protection chamber 12ca expands and expands forward from the upper part of the backrest portion 1b of the seat 1, for example, by jumping over the headrest 1c. On the other hand, the side protection chamber 12cc expands and expands forward from the left and right side portions of the backrest portion 1b of the seat 1.

At that time, the side protection chamber 12cc on the side through which the seatbelt 3 passes expands and expands between the seatbelt 3 and the occupant 2. Then, as shown in FIG. 4, the space S is formed between the airbag 12 expanded and expanded at the position where the seatbelt 3 passes and the occupant 2 due to the expansion and expansion of the side protection chamber 12cc. Specifically, a space S is formed between the temporal region on the side where the seat belt 3 of the occupant 2 seated at the normal position of the seat 1 passes and the upper end portion of the shoulder portion 2c. In the case of the seat belt 3 passing through the shoulder opening on the near side of the occupant, the temporal region of the occupant 2 is a position corresponding to the upper end portion of the headrest 1c on the side door side. Further, the upper end portion of the shoulder portion 2c of the occupant 2 is a position corresponding to the upper end portion of the backrest portion 1b on the side door side.

In order to form the space S, as shown in FIG. 2, the gas ejected from the inflator 13 to the side protection chamber 12cc at the position where the seat belt 3 of the airbag 12 in the flat placement state passes during expansion and deployment. It is desirable to position it near the exit of.

Specifically, as shown in FIG. 2, the side protection chamber 12cc comprises a shoulder protection portion 12cba covering the shoulder portion 2c of the occupant 2 and the chest 2e, and a waist protection portion 12cbb covering the waist portion 2f of the occupant 2. In this case, it is desirable to form the shoulder-chest protection portion 12 cba at the position where the seat belt 3 passes during expansion and deployment.

In order to form the shoulder / chest protection portion 12cba at the position where the seat belt 3 passes during expansion and deployment, for example, the tab 12f on the left-right center side of the airbag 12 between the two inflators 13 is set on the head of the seated occupant 2. It is attached to the sheet 1 portion near 2a. On the other hand, the inflator 13 is attached to the seat 1 portion in the vicinity of the chest 2e of the seated occupant 2. Further, the tabs 12f on both left and right sides of the airbags 12 of both inflators 13 are attached to the seat 1 portion in the vicinity of the waist portion 2f of the seated occupant 2 (see FIG. 1A).

As a result, in the initial stage of expansion and deployment of the airbag 12, high gas pressure is applied to the region of the airbag 12 sandwiched between the shoulder of the occupant 2 and the seat belt 3 (the waist portion of the head protection chamber 12ca and the side protection chamber 12cc). It joins the duct part that connects the protection part 12cbb). Therefore, the airbag 12 can be expanded and expanded while pushing up the seat belt 3.

In the case of such an airbag 12, the seatbelt 3 (see FIG. 5) passing near the side view line PL connecting the center of the head portion 2a and the center of the shoulder portion 2c of the occupant 2 during expansion and deployment. A space S is formed between the neck portion 2b of the occupant 2.

In the present invention, the space S allows the expanded and expanded airbag 12 to be easily moved relative to the occupant 2, so that the expanded and expanded airbag 12 can cover the shoulder portion 2c of the occupant 2. become. Therefore, even when the seatbelt 3 is tense, as shown in FIG. 3C, the expanded and expanded airbag 12 is sandwiched between the shoulder portion 2c of the occupant 2 and the seatbelt 3, and the seatbelt 3 is held. It is possible to suppress the contact with the neck portion 2b of the occupant 2, and the damage to the neck portion 2b of the occupant 2 is reduced.

At the same time, the expanded and expanded airbag 12 causes the seat belt 3 to float at least in the vicinity of the upper part of the chest 2e of the occupant 2. On the other hand, the lower part of the seatbelt 3 can appropriately restrain the part below the abdomen of the occupant 2, and the amount of chest deflection is reduced (see FIG. 1A).

That is, according to the present invention, the unnecessary force applied to the occupant 2 can be minimized as a whole. In addition, the forward movement of the occupant 2 at the time of a frontal collision can be suppressed as compared with the case where the occupant 2 is restrained only by the seat belt 3 and the front airbag 4 shown in FIG. 6 (a) (FIG. 6 (b)). See).

Further, at the initial stage of a side collision, the occupant 2 tends to move to the collided side due to the inertial force acting on the occupant 2. At that time, in addition to the reaction force from the vehicle body side portion, the reaction force from the seat belt 3 can be applied to the airbag 12 to restrain the occupant 2, so that when the seat belt 3 shown in FIG. 7A is not present. In comparison, the lateral movement of the occupant 2 can be suppressed (see FIG. 7B). Further, although not particularly shown, when the head protection chamber 12ca and the side protection chamber 12cc are integrally connected and provided, they are seated on the far side opposite to the collision side at the initial stage of the collision. The seat belt 3 presses the expanded and expanded airbag 12 against the occupant 2. Therefore, it is possible to prevent the entire airbag 12 in which the head protection chamber 12ca and the side protection chamber 12cc are integrally connected from moving to the far side side. That is, even if the occupant 2 tries to move toward the center of the width of the vehicle, the effect of restraining the airbag 12 by the seat belt 3 also provides protection against the movement (collision) of the occupant 2 to the far side side. It can be improved. This is the same even when the directions of the forces acting on the occupant 2 on the near side side and the far side side are opposite to each other or when the vehicle rolls over in the latter half of the collision. That is, in the present invention, it is expected that the restraint and protection performance of the occupant 2 will be improved in all the events in the lateral collision.

The airbag 12 is not limited to the first embodiment described with reference to FIGS. 1 to 7, and may have a configuration as in the second to fourth embodiments shown in FIGS. 8 to 9.

FIG. 8 shows a second embodiment of the airbag 12. In this second embodiment, for example, in a flat state before being rolled into a roll or folded into a bellows shape, an inflated portion of the head protection chamber 12ca and the shoulder / chest protection portion 12cba on the side through which the seatbelt 3 passes in the chamber 12c. Is extended downward from the inflated portion of the other chamber (see FIG. 8 (a)). In this case, as shown in FIG. 8B, when the airbag 12 is expanded and deployed, the extension portion 12d of the head protection chamber 12ca and the shoulder / chest protection portion 12cba wraps around in front of the occupant 2 due to contact with the seat belt 3. It will be.

Further, FIG. 9 shows a third embodiment of the airbag 12. In this third embodiment, for example, in a flat state before being rolled into a roll or folded into a bellows shape, only the shoulder / chest protection portion 12cba through which the seat belt 3 of the side protection chamber 12cc passes is used, and the extension portion 12d is more than the extension portion 12d. An extension portion 12cc extended further downward is formed (see FIG. 9A). In this case, as shown in FIG. 9B, the range in which the airbag 12 wraps around in front of the occupant 2 due to the contact with the seat belt 3 becomes wider, and the restraint performance of the occupant 2 is further improved.

Further, FIG. 10 shows a fourth embodiment of the airbag 12. In this fourth embodiment, for example, in a flat state before being rolled into a roll or folded into a bellows shape, in addition to the shoulder / chest protection portion 12cba shown in FIG. 9, the head protection chamber 12ca is further extended downward. The extended portion 12cd is formed (see FIG. 10A). In this case, as shown in FIG. 10B, the front of the head 2a of the occupant 2 can also be covered with the airbag 12, so that the occupant's restraint performance is further improved.

It goes without saying that the present invention is not limited to the above examples, and the embodiments may be appropriately changed as long as it is within the scope of the technical idea described in each claim.

That is, the airbag device described above is a preferred example of the present invention, and other embodiments can also be implemented or carried out by various methods. Unless otherwise specified in the specification of the present application, the present invention is not limited to the shape, size, configuration arrangement, etc. of the parts shown in the accompanying drawings. In addition, the expressions and terms used in the present specification are for the purpose of explanation, and are not limited thereto unless there is a particular gist.

For example, the airbag 12 shown in FIG. 8A has a head protection chamber 12ca and a shoulder / chest protection portion 12cba on the side through which the seatbelt 3 passes in a flat state before being rolled into a roll or folded into a bellows shape. Although it is extended downward, only the shoulder / chest protection portion 12 cba may be extended downward.

Further, the lateral portion of the occupant 2 covered with the airbag 12 is not limited to the one covering the head portion 2a to the waist portion 2f of the occupant 2 as shown in FIGS. It suffices as long as it can protect the line PL portion on the side view connecting the center of 2a and the center of the shoulder portion 2c. For example, as shown in FIG. 11A, the head 2a of the occupant 2, the neck 2b, the shoulder 2c, and the upper arm 2d are covered, and as shown in FIG. 11B, the head 2a of the occupant 2 is covered. , The neck portion 2b, the shoulder portion 2c, the upper arm portion 2d, and the chest portion 2e may be covered. Further, as shown in FIG. 11C, even when only the head portion 2a and the neck portion 2b of the occupant 2 are covered, the space S is formed between the airbag 12 at the position where the seat belt 3 passes and the neck portion 2b of the occupant 2. If so, the effect is less than that shown in FIGS. 11 (a) and 11 (b), but the restraint performance of the occupant 2 is improved as compared with the conventional case. Further, as shown in FIG. 11D, a non-expandable portion (hatched portion) may be formed at a position where the seatbelt 3 passes. In this case, since the thickness of the airbag 12b around the occupant 2's arm (particularly the upper arm portion 2d) can be reduced, the speed of expansion and deployment of the side protection chamber 12 cab can be increased regardless of the posture of the occupant 2.

Further, the airbag 12 is not limited to the one formed by sewing two sheets, but may be formed by using a so-called “one-piece weaving” technique.

Further, although the airbags 12 shown in FIGS. 2 and 8 to 10 are all provided with the gas guide 18, the gas of the inflator 13 is surely guided to the side protection chamber 12cc and the head protection chamber 12ca. If so, the gas guide 18 may be omitted.

Further, in the above description, the airbag device 11 applied to the seatbelt 3 installed on the near side has been described, but the airbag device 11 of the present invention can also be applied to the seatbelt 3 installed on the far side. Of course, it can also be applied to seat belts installed on both the near side and the far side. Further, the seat belt 3 to which the airbag device 11 of the present invention can be applied is not limited to the one fixed in the lateral vicinity of the vehicle seat 1, but is fixed to the rear of the vehicle seat like a sports car. But it may be.

Further, in the first to fourth embodiments, the inflator 13 is provided on the upper edge of the airbag 12 in the flat-placed state before being rolled into a roll or folded into a bellows-like shape. Inflators 13 may be provided on both the left and right sides of the airbag 12.

1 Vehicle seat 1b Backrest 1c Headrest 2 Crew 2a Head 2b Neck 3 Seatbelt 11 Airbag device 12 Airbag 12c Chamber 12ca Head protection chamber 12cb Side protection chamber 12cba Shoulder chest protection 12cbb Waist protection 12c 12cd extension 12d extension 12f tab 13 inflator 13a stud bolt S space

Claims (5)

An airbag device including an airbag that integrally covers the head and sides of an occupant seated on a vehicle seat and an inflator that supplies gas to the airbag.
The airbag in a flat state before being rolled or folded into a bellows has a plurality of longitudinally partitioned chambers.
These chambers
A head protection chamber housed in the upper part of the backrest of the seat and covering the temporal region from the crown of the occupant, and a head protection chamber.
It has a side protection chamber that is housed in opposite positions on the left and right sides of the backrest and is separated from each other in the vehicle width direction and covers the side of the occupant.
The head protection chamber jumps over the headrest from the upper part of the backrest portion or expands and expands forward from the upper part of the backrest portion, while the side protection chamber expands and expands toward the left and right sides of the backrest portion. When expanding and deploying from the front to the front, the side protection chamber expands and expands between the seatbelt in the normal set state and the occupant, and between the airbag and the occupant which expands and expands to the position where the seatbelt passes. The airbag is configured so that a space can be formed in the air bag.
An airbag device characterized in that the position of the airbag through which the seat belt passes is near the outlet of gas ejected from the inflator to the side protection chamber during expansion and deployment . An airbag device including an airbag that integrally covers the head and sides of an occupant seated on a vehicle seat and an inflator that supplies gas to the airbag.
The airbag in a flat state before being rolled or folded into a bellows has a plurality of longitudinally partitioned chambers.
These chambers
A head protection chamber housed in the upper part of the backrest of the seat and covering the temporal region from the crown of the occupant, and a head protection chamber.
It has a side protection chamber that is housed in opposite positions on the left and right sides of the backrest and is separated from each other in the vehicle width direction and covers the side of the occupant.
The head protection chamber jumps over the headrest from the upper part of the backrest portion or expands and expands forward from the upper part of the backrest portion, while the side protection chamber expands and expands toward the left and right sides of the backrest portion. When expanding and deploying from the front to the front, the side protection chamber expands and expands between the seatbelt in the normal set state and the occupant, and between the airbag and the occupant which expands and expands to the position where the seatbelt passes. The airbag is configured so that a space can be formed in the air bag.
The side protection chamber has a shoulder / chest protection portion that covers the shoulder and chest of the occupant, and a waist protection portion that covers the waist of the occupant. The shoulder / chest protection portion is a position through which the seat belt passes during expansion and deployment. An air bag device characterized by being formed in. The airbag device according to claim 2, wherein in the flat-laying state, the shoulder-chest protection portion has an extension portion extending below the airbag with respect to other portions of the side protection chamber. ..
The airbag device according to claim 3, wherein in addition to the shoulder-chest protection portion, the head protection chamber also has an extension portion extending below the airbag. The airbag is attached to the backrest portion by the stud bolts provided on the inflator attached to the left and right of the upper edge portion of the airbag or the left and right sides of the airbag in the flat placement state, and the airbag. It is done by the left and right sides of the inflator at the upper edge, or by the tabs attached to the top and bottom of the inflator on the left and right sides of the airbag.
The tab on the left-right center side of the airbag or on the upper side of the airbag is near the head of the seated occupant, and the inflator is near the chest of the occupant, on both sides of the airbag in the left-right direction, or the air. The airbag device according to any one of claims 1 to 4, wherein the tab on the lower side of the bag is attached near the waist of the occupant.

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