JP2022068738A - Occupant protection device - Google Patents

Abstract

To obtain an occupant protection device that can easily achieve inflation and expansion of a lower chamber prior to an upper chamber in a side airbag.SOLUTION: A side airbag 34 has a gouge 36 gouged from a seat front side to a seat rear side in a connecting part 34D connecting an upper chamber 34H and a lower chamber 34P. This allows the upper chamber 34H and the lower chamber 34P to be folded at different deployment speed from each other. The upper chamber 34H is folded by a roll fold in which a side facing a seated occupant D is rolled inward. The lower chamber 34P is folded from the seat front side toward the seat rear side by a cornice fold in which a fold direction is alternated to be folded over in the front-back direction.SELECTED DRAWING: Figure 1

Description

The present invention relates to an occupant protection device.

The following Patent Document 1 discloses a technique relating to a side airbag device in which an airbag module is housed in a side portion of a seat back of a vehicle seat. Briefly, in this prior art, the side airbag is configured to include a head protection inflator and a waist protection inflator that expand and expand by receiving gas supply in the event of a side collision. The head protection expansion portion restrains the occupant's head in the expansion / deployment state, and the waist protection expansion portion restrains the occupant's waist portion in the expansion / deployment state.

Japanese Unexamined Patent Publication No. 2011-105107

By the way, from the viewpoint of moving the seated occupant inward in the vehicle width direction at an early stage in the event of a side collision, there is a need to expand and deploy the lumbar protection expansion portion (lower chamber) before the head protection expansion portion (upper chamber). .. However, in the case of the above-mentioned prior art, since the head protection expansion portion and the waist protection expansion portion are integrally folded, it is difficult to easily meet the above needs, and there is room for improvement in this respect.

In view of the above facts, it is an object of the present invention to obtain a occupant protection device that can easily realize expansion and deployment of the lower chamber before the upper chamber in the side airbag.

The occupant protection device of the present invention according to claim 1 is a three-point seat belt device that restrains the waist of the seated occupant with a lap belt and restrains the upper body of the seated occupant with a shoulder belt, and is in a folded state. The upper chamber, which is housed in the seat back and is expanded and expanded by receiving gas supply, abuts on the upper rear surface of the shoulder belt and expands and expands so as to reach the side of the seated occupant's head, and the seated occupant. It has a lower chamber that is expanded and deployed laterally with respect to the waist portion, and a side airbag that includes a connecting portion that connects the upper chamber and the lower chamber, and the connecting portion is attached to the connecting portion from the front side of the seat. A gouged portion is formed on the rear side of the seat, and the lower chamber is folded in a folding manner in which the unfolding speed when expanded and unfolded is faster than that of the upper chamber.

According to the above configuration, the waist of the seated occupant is restrained by the lap belt, and the upper body of the seated occupant is restrained by the shoulder belt. When the side airbag receives gas supply, the side airbag expands and expands from inside the seat back. The upper chamber, which forms part of the side airbag, abuts on the upper rear surface of the shoulder belt and is expanded and deployed so as to reach the side of the seated occupant's head. This allows the upper chamber to receive reaction forces from the shoulder belt when restraining the seated occupant's head. On the other hand, the lower chamber constituting the other part of the side airbag is expanded and deployed laterally to the waist of the seated occupant.

Further, in the connecting portion connecting the upper chamber and the lower chamber, a gouged portion cut from the front side of the seat to the rear side of the seat is formed. This makes it possible to fold the upper chamber and the lower chamber in different ways. Further, in the present invention, the lower chamber is folded in a folding manner in which the unfolding speed when expanded and unfolded is faster than that of the upper chamber. Therefore, when the side airbag receives gas supply, the lower chamber expands and deploys at a faster deployment rate than the upper chamber.

When the gouged portion is formed in the connecting portion, the rigidity of the side airbag in the expanded and deployed state is reduced by that amount. However, when the side airbag is expanded and deployed, the joint must be bent inward in the seat width direction with respect to the lower chamber in order to bring the lower part of the upper chamber into contact with the upper rear surface of the shoulder belt. , The above-mentioned reduction in rigidity is effectively utilized.

In the occupant protection device of the present invention according to claim 2, in the configuration according to claim 1, the upper chamber is folded from the front side of the seat to the rear side of the seat by folding the upper chamber so as to wrap the surface on the seated occupant side inward. The lower chamber is provided with an inner roll fold that is folded toward the seat, and the lower chamber has a bellows fold that is folded from the front side of the seat to the rear side of the seat by a bellows fold that is folded in the front-rear direction of the seat by alternately changing the folding direction. Be prepared.

According to the above configuration, the inner roll fold portion of the upper chamber is folded by the roll fold that folds the surface on the seated occupant side so as to wrap inward. Therefore, when the inner roll fold portion of the upper chamber is expanded and expanded, the portion that is sequentially unwound in the inner roll fold portion of the upper chamber is arranged on the seated occupant side, so that the upper chamber in the middle of expansion and expansion is a shoulder. It can prevent it from getting caught in the belt. Further, the bellows folding portion of the lower chamber is folded from the front side of the seat to the rear side of the seat by the bellows folding which is folded in the front-rear direction of the seat by alternately changing the folding direction. Therefore, the lower chamber that has received the gas supply can be rapidly expanded and expanded.

The occupant protection device of the present invention according to claim 3 includes a cactus folding portion folded by cactus folding in at least one of the upper chamber and the lower chamber in the configuration according to claim 2.

According to the above configuration, by adding the cactus folding portion, it is possible to increase the variation of the expansion and deployment method that can be set in the side airbag. Therefore, for example, it becomes easy to adjust and set the method of expanding and deploying the side airbag according to the configuration of the seat back and the seat belt device.

As described above, the occupant protection device of the present invention has an excellent effect that the lower chamber can be easily expanded and deployed before the upper chamber in the side airbag.

It is a side view schematically showing the protection mode of a occupant by the occupant protection device which concerns on one Embodiment of this invention. It is a front view schematically showing the protection mode of a occupant by the occupant protection device which concerns on one Embodiment of this invention. It is a figure which shows the flat pattern of the side airbag which constitutes the occupant protection device which concerns on one Embodiment of this invention. FIG. 3 is an enlarged cross-sectional view schematically showing a folded state of the upper chamber of the side airbag shown in FIG. 3 (a portion along the line 4A-4A in FIG. 3). FIG. 3 is an enlarged cross-sectional view schematically showing a folded state of the lower chamber of the side airbag shown in FIG. 3 (a portion along the line 4B-4B in FIG. 3). It is a side view which shows the schematic whole structure before the operation of the occupant protection device which concerns on one Embodiment of this invention. It is a front view which shows the state which the side airbag constituting the occupant protection device which concerns on one Embodiment of this invention is housed in a seat back. It is sectional drawing which shows typically the modification which the upper chamber of a side airbag is cactus-folded and then roll-folded. It is sectional drawing which shows typically the modification which the lower chamber of a side airbag is cactus-folded and then bellows-folded.

The occupant protection device 10 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 6. The arrow FR appropriately shown in these figures indicates the front direction of the vehicle seat 12 (the direction in which the seated occupant faces), and the arrow UP indicates the upward direction of the vehicle seat 12. In the following, when the explanation is simply made using the front-back, up-down, and left-right directions, unless otherwise specified, the left-right directions when facing the front-back in the front-rear direction of the seat, the up-down in the up-down direction of the seat, and the front in the front-back direction of the seat are shown. And. Further, the arrow IN appropriately shown in these figures indicates the center side in the vehicle width direction in the automobile as a vehicle on which the vehicle seat 12 is mounted.

(Structure of Embodiment)
As shown in FIGS. 1 and 2, the occupant protection device 10 is mounted on the vehicle seat 12. The vehicle seat 12 is arranged so as to be offset to the left or right (left side in this embodiment) with respect to the central portion in the vehicle width direction in an automobile (not shown). In the vehicle seat 12, the front-rear direction of the seat coincides with the front-rear direction of the vehicle, and the seat width direction coincides with the vehicle width direction.

It should be noted that FIGS. 1 and 2 show a state in which a dummy (doll) D for a collision test is seated on a vehicle seat 12 as a model of an occupant to be protected. The dummy D is, for example, AM50 (50th percentile of an American adult male) of WorldSID (World Side Impact Dummy). The dummy D is seated in a standard sitting posture defined by the collision test method, and the vehicle seat 12 is located at a reference setting position corresponding to the sitting posture. Hereinafter, for the sake of clarity, the dummy D will be referred to as a “seated occupant D”.

The vehicle seat 12 has a seat cushion 14, a seat back 16 connected to the rear end portion of the seat cushion 14, and a headrest 18 connected to the upper end portion of the seat back 16. The seat cushion 14 is a component that supports the buttocks and thighs of the seated occupant D. The seat back 16 is a component that supports the back of the seated occupant D. The headrest 18 is a component that supports the head H of the seated occupant D. Further, the headrest 18 is attached to the seat back 16 by the headrest stay 18S.

The occupant protection device 10 includes a seatbelt device 20 and a side airbag device 30. Hereinafter, the configurations of the seat belt device 20 and the side airbag device 30 will be described.

The seatbelt device 20 is a three-point seatbelt device. The seatbelt device 20 includes a seatbelt 22 for restraining an occupant. One end 22A of the seat belt 22 is attached to the outer side of the seat cushion 14 in the vehicle width direction via an anchor plate 23, and the other end 22B of the seat belt 22 is a retractor (belt winding) shown in FIG. The device) is locked to the spool 24S of 24. Further, the intermediate portion of the seat belt 22 is inserted into and folded back through the shoulder anchor 25 provided on the upper side of the vehicle side portion (center pillar (not shown)). Further, as shown in FIG. 2, a buckle 26 is erected on the inner side portion of the seat cushion 14 in the vehicle width direction. A tongue plate 27 supported in a state of being inserted into the middle portion of the seat belt 22 is engaged with the buckle 26.

In the seatbelt device 20, the seatbelt 22 is attached to the seated occupant D by engaging the tongue plate 27 with the buckle 26 while the seated occupant D is seated on the seat cushion 14. With the tongue plate 27 engaged to the buckle 26, the portion of the seatbelt 22 located between the tongue plate 27 and the anchor plate 23 is called the lap belt 22L, and the seatbelt 22 is from the tongue plate 27. The portion located between the shoulder anchor 25 (see FIG. 1) is referred to as the shoulder belt 22S. Then, the seat belt device 20 restrains the waist portion P of the seated occupant D with the lap belt 22L and restrains the upper body of the seated occupant D with the shoulder belt 22S.

The retractor 24 shown in FIG. 1 is fixed in the vicinity of the lower end portion of a center pillar (not shown) constituting the vehicle skeleton member. The spool 24S of the retractor 24 is a member that is formed in a cylindrical shape and winds up the seat belt 22, and is arranged so that the axial direction thereof faces the front-rear direction of the vehicle. An urging mechanism 24F is arranged on one side side (rear side of the vehicle) of the spool 24S. The spool 24S is constantly urged in the direction of winding the seat belt 22 by the urging mechanism 24F.

Further, the retractor 24 includes a pretensioner 28. The pretensioner 28 is adapted to apply tension to the shoulder belt 22S by rotating the spool 24S in the direction of winding the seat belt 22 by operating the pretensioner 28. The pretensioner 28 includes a motor 28M arranged on the other side (front side of the vehicle) of the spool 24S. The motor 28M is adapted to drive the spool 24S in the winding direction by rotating. An ECU (Electrical Control Unit) 50 (see FIG. 5), which will be described later, is electrically connected to the motor 28M.

On the other hand, the side airbag device 30 is mounted on the seat back 16. The side airbag device 30 includes an inflator 32 and a side airbag 34.

As the inflator 32, a combustion type or a cold gas type is adopted, and the gas generated by the operation is supplied into the side airbag 34. In this embodiment, the inflator 32 is a cylinder type inflator, and is arranged with the vertical direction of the seat back 16 as the longitudinal direction. The spout of the inflator 32 is directed downward. An ECU 50 (see FIG. 5), which will be described later, is electrically connected to the inflator 32.

FIG. 3 shows a flat pattern of the side airbag 34. The side airbag 34 is composed of two base cloths formed by cutting out, for example, a nylon-based or polyester-based cloth material. The side airbag 34 is formed in a bag body by sewing the peripheral edges of two base fabrics overlapped with each other at a sewing portion (seam) T. An inflator insertion port 34A for inserting an inflator 32 (see FIG. 1) is formed at the rear and lower side of the side airbag 34.

The side airbag 34 is in a folded state in the seat back 16 shown in FIG. It is stored so that it has a character shape. As shown in FIG. 1, the side airbag 34 receives gas supply from the inflator 32, protrudes from the inside of the seat back 16 toward the front side of the seat, and expands and expands outside the vehicle width direction with respect to the seated occupant D. The side airbag 34 has an upper chamber 34H that abuts on the rear surface of the upper portion 22S1 of the shoulder belt 22S and is expanded and deployed so as to reach the side of the seated occupant D with respect to the head H, and the side of the seated occupant D with respect to the waist P. It includes a lower chamber 34P that expands and expands on the side. In FIG. 3, the range of the upper chamber 34H is surrounded by the alternate long and short dash line A, and the range of the lower chamber 34P is surrounded by the alternate long and short dash line B. The upper chamber 34H and the lower chamber 34P are connected to each other by a connecting portion 34D.

As shown in FIG. 1, the connecting portion 34D is formed with a gouged portion 36 cut from the front side of the seat to the rear side of the seat. As shown in FIG. 3, in the connecting portion 34D, the communication portion between the upper chamber 34H and the lower chamber 34P is narrowed by forming the hollow portion 36. Further, the gouged portion 36 is formed by cutting the base cloth in a V shape as an example.

The rear end side of the tubular sock (duct, diffuser) 38 is sewn to the rear portion inside the side airbag 34 shown in FIG. 1. The sock 38 extends in the vertical direction of the seat, and the passage opening area on the lower side is set to be larger than the passage opening area on the upper side. The sock 38 is arranged on the front side with respect to the inflator 32, and the lower portion of the sock 38 is configured to lead to the spout of the inflator 32. The upper spout 38A of the sock 38 is located inside the upper chamber 34H, and the lower spout 38B of the sock 38 is located inside the lower chamber 34P. As a result, the sock 38 supplies the gas from the inflator 32 to the upper chamber 34H and the lower chamber 34P.

The upper ejection port 38A of the sock 38 is configured to blow out gas toward the front side of the seat. In the present embodiment, the upper ejection port 38A of the sock 38 is formed by being cut diagonally so as to face the diagonally upper side in front of the seat. As shown in FIG. 2, the upper ejection port 38A of the sock 38 has the shoulder belt 22S and the head H of the seated occupant D near the side of the head H of the seated occupant D in the expanded and deployed state of the side airbag 34. Placed between and. In other words, the upper ejection port 38A of the sock 38 is arranged near the side of the headrest stay 18S in the expanded and deployed state of the side airbag 34.

The lower spout 38B of the sock 38 is configured to blow gas toward the lower side of the seat. In the present embodiment, the lower ejection port 38B of the sock 38 is formed by being cut substantially horizontally so as to face the lower side of the seat. The lower ejection port 38B of the sock 38 is arranged in the vicinity of the side support portion 14S of the seat cushion 14 in the expanded and deployed state of the side airbag 34.

The side airbag 34 is folded and housed in the seat back 16 with the sock 38 sewn inside. As shown in FIG. 6, the upper chamber 34H of the side airbag 34 is housed in a folded state in the portion of the seat back 16 on the shoulder opening 16A side, and the lower chamber 34P of the side airbag 34 is inside the seat back 16. It is housed in a folded state in the side portion 16S side on the outer side in the vehicle width direction. Here, the folding form of the upper chamber 34H and the lower chamber 34P will be described.

FIG. 4A schematically shows the folded state of the upper chamber 34H (more specifically, the portion along the line 4A-4A in FIG. 3) of the side airbag 34 in the flat state shown in FIG. It is shown in an enlarged cross section. In FIG. 4A, a part of the cross section along the line 4A-4A of FIG. 3 is simplified and shown by a two-dot chain line. Further, FIG. 4B schematically shows a folded state of the lower chamber 34P (more specifically, a portion along the line 4B-4B in FIG. 3) of the side airbag 34 in a flat state shown in FIG. It is shown in an enlarged cross-sectional view. In FIG. 4B, a part of the cross section along the line 4B-4B of FIG. 3 is simplified and shown by a two-dot chain line. Further, in the folded state views shown in FIGS. 4A and 4B, the cross sections of the pair of laminated and sewn base fabrics are collectively shown by a single thick line in order to make the figure easier to see. The arrows FR and IN in FIGS. 4A and 4B indicate the directions at the stage when the side airbag 34 is unfolded when the side airbag 34 is expanded and unfolded (in FIGS. 7A and 7B described later). The same applies). As shown in FIGS. 4A and 4B, the upper chamber 34H and the lower chamber 34P are folded in different ways from each other.

As shown in FIG. 4A, the upper chamber 34H was folded from the front side of the seat to the rear side of the seat by a roll fold that folds the surface of the seated occupant D side (upper side in the figure in FIG. 4A) inward. The inner roll folding portion 34R is provided. In the present embodiment, the entire upper chamber 34H in the folded state is composed of the inner roll folding portion 34R.

On the other hand, as shown in FIG. 4B, the lower chamber 34P is folded from the front side of the seat to the rear side of the seat by the bellows fold (Z fold) which is folded in the front-rear direction of the seat by alternately changing the folding direction. A unit 34S is provided. In the present embodiment, the entire lower chamber 34P in the folded state is composed of the bellows folding portion 34S. That is, the lower chamber 34P is folded in a folding manner in which the expansion speed when expanded and expanded is faster than that of the upper chamber 34H (see FIG. 4A). Although not shown, the connecting portion 34D of the side airbag 34 shown in FIG. 3 is folded in the same manner as the lower chamber 34P.

As shown in FIG. 3, a one end portion in the longitudinal direction of the tether 40 (not shown except for FIG. 3) is attached to the trailing edge portion of the upper chamber 34H. The other end of the tether 40 in the longitudinal direction is attached to the headrest stay 18S (see FIG. 1).

As shown in FIG. 5, the motor 28M of the pretensioner 28 of the seatbelt device 20 and the inflator 32 of the side airbag device 30 are each electrically connected to the ECU 50 and are controlled by the ECU 50. The ECU 50 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and an input / output I / F (Inter Face). Further, the ECU 50 is electrically connected to the collision sensor 52.

The ECU 50 is capable of detecting or predicting a frontal collision and a side collision with the vehicle which is the own vehicle based on the information from the collision sensor 52. The ECU 50 operates the motor 28M of the pretensioner 28 when a frontal collision is detected or predicted based on the information from the collision sensor 52. Further, the ECU 50 operates the inflator 32 when a side collision is detected or predicted based on the information from the collision sensor 52.

(Action / effect of embodiment)
Next, the operation and effect of the above embodiment will be described.

When the ECU 50 detects or predicts a side collision based on the information from the collision sensor 52, the ECU 50 operates the inflator 32. As a result, when the side airbag 34 receives the gas supply, the side airbag 34 is expanded and deployed with respect to the seated occupant D on the outer side in the vehicle width direction, as shown in FIGS. 1 and 2. At this time, the upper chamber 34H forming a part of the side airbag 34 abuts on the rear surface of the upper portion 22S1 of the shoulder belt 22S and is expanded and expanded so as to reach the side side of the seated occupant D with respect to the head H. As a result, the upper chamber 34H can receive a reaction force from the shoulder belt 22S when restraining the head H of the seated occupant D. Therefore, the upper chamber 34H can restrain the head H of the seated occupant D with a lower pressure than the case where the reaction force is not received from the shoulder belt 22S, and the capacity required for restraint can be small. On the other hand, the lower chamber 34P constituting the other part of the side airbag 34 is expanded and deployed laterally to the waist portion P of the seated occupant D.

Further, as shown in FIG. 1, the connecting portion 34D connecting the upper chamber 34H and the lower chamber 34P is formed with a gouged portion 36 scooped from the front side of the seat to the rear side of the seat. This makes it possible to fold the upper chamber 34H and the lower chamber 34P in different folding methods. Then, in the present embodiment, the lower chamber 34P is folded in a folding manner in which the unfolding speed when expanded and unfolded is faster than that of the upper chamber 34H. Therefore, when the side airbag 34 receives the gas supply, the lower chamber 34P is expanded and deployed at a faster deployment speed than the upper chamber 34H.

More specifically, as shown in FIG. 4A, the inner roll folding portion 34R of the upper chamber 34H is folded so as to wrap the surface of the seated occupant D side (upper side in the figure in FIG. 4A) inward. It is folded. Therefore, when the inner roll folding portion 34R of the upper chamber 34H is expanded and expanded, the portion that is sequentially unwound in the inner roll folding portion 34R of the upper chamber 34H is on the seated occupant D side (upper side in the figure of FIG. 4A). Since it is arranged, it is possible to prevent the upper chamber 34H during expansion and deployment from being caught by the shoulder belt 22S shown in FIG. Further, as shown in FIG. 4B, the bellows folding portion 34S of the lower chamber 34P is folded from the front side of the seat to the rear side of the seat by the bellows folding which is folded in the front-rear direction of the seat by alternately changing the folding direction. .. Therefore, the gas-supplied lower chamber 34P can be rapidly expanded and deployed in the narrow space between the seated occupant D and the side door trim 60 shown in FIG.

When the gouged portion 36 is formed in the connecting portion 34D shown in FIG. 1 and the like, the rigidity of the side airbag 34 in the expanded and deployed state is reduced by that amount. However, here, as shown in FIG. 2, the connecting portion 34D is attached to the lower chamber 34P in order to bring the lower portion of the upper chamber 34H into contact with the rear surface of the upper 22S1 of the shoulder belt 22S when the side airbag 34 is expanded and deployed. On the other hand, since it is necessary to bend the seat inward in the width direction, the above-mentioned decrease in rigidity can be effectively utilized.

As described above, according to the occupant protection device 10 of the present embodiment, it is possible to easily expand and deploy the lower chamber 34P before the upper chamber 34H in the side airbag 34.

(Modified example of the above embodiment)
Next, a modification of the above embodiment will be described with reference to FIGS. 7A and 7B. FIG. 7A shows a modified example of the folding method of the upper chamber 34H in a cross-sectional view, and FIG. 7B shows a modified example of the folding method of the lower chamber 34P in a cross-sectional view. In FIGS. 7A and 7B, the cross section of the base fabric is simplified and shown by thick lines, and the sewn portion is not shown, and the inner gap is exaggerated to make the figure easier to see. Further, the upper chamber 34H and the lower chamber 34P are designated by the same reference numerals as those in the above embodiment for convenience.

As a modification of the above embodiment, the upper chamber 34H includes a cactus folding portion 34X folded by the cactus folding shown in FIG. 7A, and the seated occupant D side in the cactus folded state (in the figure in FIG. 7A). It may be configured to include an inner roll folding portion folded from the front side of the seat to the rear side of the seat by folding the roll folding so as to wrap the surface (upper side) inward (see the arrow C direction indicated by the alternate long and short dash line).

Further, as another modification of the above embodiment, the lower chamber 34P includes a cactus folding portion 34Y folded by the cactus folding shown in FIG. 7B, and the alternate long and short dash line in the figure in the cactus folded state. As shown by Z, the bellows folding portion which is folded from the front side of the seat to the rear side of the seat by the bellows folding which alternately changes the folding direction and folds in the front-rear direction of the seat may be provided.

The cactus folding portions 34X and 34Y shown in FIGS. 7A and 7B are provided at a portion arranged on the front side in the front-rear direction of the seat when the side airbag 34 is expanded and deployed. The cactus folding portions 34X and 34Y are folded by cactus folding so that a part of the front side of the side airbag 34 is bent inside the other portion of the side airbag 34. Since the cactus folding is known in, for example, Japanese Patent No. 3357937, detailed description thereof will be omitted. The above two modifications have the same configuration as the above embodiment except that the side airbag 34 is folded differently. Incidentally, the folding method shown by the solid line in FIGS. 7A and 7B may be grasped as an inward folding.

By adding the Cactus folding portions 34X and 34Y as the folding portions as in the above modification, it is possible to increase the variation of the expansion and deployment method that can be set in the side airbag 34. Therefore, for example, it becomes easy to adjust and set the way of expanding and deploying the side airbag 34 according to the configuration of the seat back 16 and the seat belt device 20 (both see FIGS. 1 and 2).

Further, as another modification of the above embodiment, the lower chamber (34P) may be entirely folded by cactus folding. That is, the upper chamber (34H) may be folded by roll folding and the lower chamber (34P) may be folded by cactus folding. It should be noted that the cactus-folded portion has a faster unfolding speed when expanded and unfolded than the roll-folded portion.

Further, as a modification of the above embodiment, the ECU 50 shown in FIG. 5 operates the motor 28M of the inflator 32 and the pretensioner 28 when a side collision is detected or predicted based on the information from the collision sensor 52. May be good.

Further, as a modification of the above embodiment, the side airbag may be manufactured by bag folding (OPW), and a slit may be formed in the connecting portion as a hollow portion by laser cutting.

The above-described embodiment and the above-mentioned modification can be combined and implemented as appropriate.

Although an example of the present invention has been described above, the present invention is not limited to the above, and it is needless to say that the present invention can be variously modified and implemented within a range not deviating from the gist thereof. ..

10 Crew protection device 16 Seat back 20 Seat belt device 22L Wrap belt 22S Shoulder belt 22S1 Upper part of shoulder belt 34 Side airbag 34D Connection part 34H Upper chamber 34P Lower chamber 34R Inner roll fold part 34S Bellows fold part 34X Cactus Folded part 36 Gouging part D Seated occupant H Head P Waist part

Claims (3)

A three-point seatbelt device that restrains the seated occupant's waist with a lap belt and restrains the seated occupant's upper body with a shoulder belt,
The upper part is stored in the seat back in a folded state, is expanded and expanded by receiving gas supply, and is expanded and expanded so as to come into contact with the upper rear surface of the shoulder belt and reach the side side with respect to the seated occupant's head. A side airbag comprising a chamber, a lower chamber that expands and deploys laterally to the lumbar region of the seated occupant, and a junction that connects the upper chamber to the lower chamber.
Have,
The connecting portion is formed with a gouged portion cut from the front side of the seat to the rear side of the seat.
The lower chamber is a occupant protection device that is folded in such a way that the deployment speed when expanded and deployed is faster than that of the upper chamber. The upper chamber comprises an inner roll fold that is folded from the front side of the seat to the rear side of the seat by a roll fold that folds the seated occupant side surface inward.
The occupant protection device according to claim 1, wherein the lower chamber includes a bellows folding portion that is folded from the front side of the seat to the rear side of the seat by a bellows folding that alternately folds in the folding direction and folds in the front-rear direction of the seat. The occupant protection device according to claim 2, wherein one of the upper chamber and at least one of the lower chambers is provided with a cactus folding portion folded by cactus folding.

Images