JP7363740B2 - Occupant protection device - Google Patents

Description

The present invention relates to an occupant protection device.

Patent Document 1 listed below discloses a technology related 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 inflatable section and a waist protection inflatable section that inflate and deploy upon receiving gas supply during a side collision. The head protection inflatable part restrains the occupant's head in the inflated and deployed state, and the waist protection inflatable part restrains the occupant's waist in the inflated and deployed state.

Japanese Patent Application Publication No. 2011-105107

Incidentally, in order to move 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 inflate and deploy the waist protection inflatable section (lower chamber) before the head protection inflatable section (upper chamber). . However, in the case of the above-mentioned prior art, since the head protection inflatable part and the waist protection inflatable part are integrally folded, it is difficult to easily meet the above needs, and there is room for improvement in this respect.

SUMMARY OF THE INVENTION In view of the above facts, it is an object of the present invention to provide an occupant protection device that can easily inflate and deploy the lower chamber of a side airbag before the upper chamber.

The occupant protection device of the present invention according to claim 1 includes a three-point seat belt device that restrains the waist of a seated occupant with a lap belt and restrains the upper body of the seated occupant with a shoulder belt; an upper chamber that is stored in a seat back and is inflated and deployed by gas supply, and is inflated and deployed so as to come into contact with the upper rear surface of the shoulder belt and reach a side of the head of the seated occupant; a side airbag including a lower chamber that is inflated and deployed on the lateral side with respect to the lumbar region of the seat; and a connecting portion that connects the upper chamber and the lower chamber; A hollowed out portion is formed toward the rear side of the seat, and the hollowed out portion is set to be disposed on the outside in the seat width direction with respect to the upper part of the shoulder belt, and the lower chamber is wider than the upper chamber. It is also folded in a way that increases the speed of expansion when it is inflated and expanded.

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. Further, when the side airbag receives gas supply, the side airbag is inflated and deployed from within the seat back. The upper chamber, which constitutes a part of the side airbag, is inflated and deployed so as to come into contact with the upper rear surface of the shoulder belt and reach the lateral side relative to the head of the seated occupant. Thereby, the upper chamber can receive a reaction force from the shoulder belt when restraining the head of the seated occupant. On the other hand, a lower chamber constituting another part of the side airbag is inflated and deployed on the side of the seated occupant's waist.

Further, a gouged portion that is gouged from the front side of the seat to the rear side of the seat is formed in the connecting portion that connects the upper chamber and the lower chamber. This allows the upper chamber and the lower chamber to be folded in different ways. Further, in the present invention, the lower chamber is folded in such a manner that the expansion speed when inflated and expanded is faster than that of the upper chamber. Therefore, when the side airbag receives gas supply, the lower chamber is inflated and deployed at a faster deployment speed than the upper chamber.

Further, the hollow portion formed in the connecting portion is set to be disposed on the outside in the seat width direction with respect to the upper part of the shoulder belt. On the other hand, if a hollow portion is formed in the connecting portion, the rigidity of the side airbag in the inflated and deployed state is reduced accordingly. However, in order to bring the lower part of the upper chamber into contact with the upper rear surface of the shoulder belt when the side airbag is inflated and deployed, the connecting part needs to be bent inward in the seat width direction with respect to the lower chamber. , the aforementioned reduction in rigidity is effectively utilized.

In the occupant protection device of the present invention as set forth in claim 2, in the structure set forth in claim 1, the upper chamber is folded from the front side of the seat to the rear side of the seat by roll-folding in which the surface facing the seated passenger is folded inward. The lower chamber includes an inner roll folding portion that is folded toward the front side of the seat, and the lower chamber has a bellows folding portion that is folded from the front side of the seat toward the rear side of the seat by a bellows folding process in which folding directions are alternately changed and folded in the front and back direction of the seat. Be prepared.

According to the above configuration, the inner roll folding portion of the upper chamber is folded by roll folding so that the surface facing the seated passenger is folded inward. Therefore, when the inner roll folded portion of the upper chamber is inflated and deployed, the portions of the inner roll folded portion of the upper chamber that are sequentially unrolled are placed on the side of the seated passenger, so that the upper chamber that is in the middle of being inflated and unfolded is in the shoulder position. Prevents it from getting caught on the belt. Further, the bellows-folding portion of the lower chamber is folded from the front side of the seat toward the rear side of the seat by the bellows-folding method in which the folding directions are alternately changed and folded in the front-rear direction of the seat. Therefore, the lower chamber receiving the gas supply can be rapidly expanded and expanded.

In the occupant protection device of the present invention according to claim 3, in the configuration according to claim 2, at least one of the upper chamber and the lower chamber includes a cactus folded portion folded by cactus folding . The folding portion is provided at a portion located on the front side in the longitudinal direction of the seat when the side airbag is inflated and deployed.

According to the above configuration, by adding the cactus fold portion, it is possible to increase the variations in the inflation and deployment methods that can be set in the side airbag. Therefore, it becomes easy to adjust and set the manner in which the side airbag is inflated and deployed, depending on the configuration of the seatback and the seatbelt device, for example.

As described above, the occupant protection device of the present invention has the excellent effect of easily inflating and deploying the lower chamber of the side airbag before the upper chamber.

FIG. 2 is a side view schematically showing how a seated person is protected by an occupant protection device according to an embodiment of the present invention. FIG. 2 is a front view schematically showing how a seated person is protected by an occupant protection device according to an embodiment of the present invention. 1 is a diagram showing a flat pattern of a side airbag that constitutes an occupant protection device according to an embodiment of the present invention. FIG. 4 is an enlarged sectional view schematically showing a folded state of the upper chamber of the side airbag shown in FIG. 3 (a portion taken along line 4A-4A in FIG. 3). FIG. 4 is an enlarged sectional view schematically showing a folded state of the lower chamber of the side airbag shown in FIG. 3 (a portion taken along line 4B-4B in FIG. 3). BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing a schematic overall configuration of an occupant protection device according to an embodiment of the invention before operation. 1 is a front view showing a state in which a side airbag constituting an occupant protection device according to an embodiment of the present invention is housed in a seat back. FIG. 7 is a cross-sectional view schematically showing a modification in which the upper chamber of the side airbag is folded into a cactus and then folded into a roll. FIG. 7 is a cross-sectional view schematically showing a modification in which the lower chamber of the side airbag is folded into a cactus shape and then folded into a bellows shape.

An occupant protection device 10 according to an embodiment of the present invention will be described based on FIGS. 1 to 6. Note that an arrow FR shown as appropriate in these figures indicates the front direction of the vehicle seat 12 (the direction toward which the seated occupant faces), and an arrow UP indicates the upward direction of the vehicle seat 12. In the following, when we simply refer to front-rear, up-down, left-right directions, unless otherwise specified, we mean front-rear in the front-rear direction of the seat, up-down in the up-down direction of the seat, and left and right when facing forward in the front-rear direction of the seat. shall be. Further, an arrow IN shown as appropriate in these figures indicates the center side in the vehicle width direction of an automobile as a vehicle in which the vehicle seat 12 is mounted.

(Configuration of embodiment)
As shown in FIGS. 1 and 2, the occupant protection device 10 is mounted on a vehicle seat 12. The vehicle seat 12 is arranged offset to either the left or the right (in this embodiment, to the left) with respect to the center in the vehicle width direction of an automobile (not shown). This vehicle seat 12 has a seat longitudinal direction aligned with the longitudinal direction of the vehicle, and a seat width direction aligned with the vehicle width direction.

1 and 2, a dummy (doll) D for a collision test is shown seated on the vehicle seat 12 as a model of an occupant to be protected. Dummy D is, for example, AM50 (50th percentile of American adult males) of WorldSID (World Side Impact Dummy). This dummy D is seated in a standard seating position determined by the collision test method, and the vehicle seat 12 is located at a standard setting position corresponding to the seating position. Hereinafter, in order to make the explanation easier to understand, the dummy D will be referred to as a "seated occupant D".

The vehicle seat 12 includes a seat cushion 14 , a seat back 16 connected to the rear end of the seat cushion 14 , and a headrest 18 connected to the upper end 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 a headrest stay 18S.

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

The seat belt device 20 is a three-point seat belt device. The seat belt device 20 includes a seat belt 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 attached to the retractor (belt retractor) shown in FIG. It is locked to the spool 24S of the device) 24. Further, the intermediate portion of the seat belt 22 is inserted through a shoulder anchor 25 provided above a side portion of the vehicle (center pillar, not shown) and is folded back. Further, as shown in FIG. 2, a buckle 26 is provided upright on the inner side of the seat cushion 14 in the vehicle width direction. A tongue plate 27 supported while being inserted through the intermediate portion of the seat belt 22 is engageable 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. When the tongue plate 27 is engaged with the buckle 26, the portion of the seat belt 22 located between the tongue plate 27 and the anchor plate 23 is called a lap belt 22L. A portion located up to the shoulder anchor 25 (see FIG. 1) is called a shoulder belt 22S. The seat belt device 20 restrains the waist 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 near the lower end of a center pillar (not shown) that constitutes a vehicle frame 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 its axial direction faces in the longitudinal direction of the vehicle. A biasing mechanism 24F is arranged on one side (vehicle rear side) of the spool 24S. The spool 24S is always urged in the direction to wind up the seat belt 22 by this urging mechanism 24F.

The retractor 24 also includes a pretensioner 28. The pretensioner 28 is configured to apply tension to the shoulder belt 22S by rotating the spool 24S in a direction to wind up the seat belt 22 when activated. This pretensioner 28 includes a motor 28M arranged on the other side (front side of the vehicle) of the spool 24S. The motor 28M rotates to drive the spool 24S in the winding direction. 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. This side airbag device 30 includes an inflator 32 and a side airbag 34.

The inflator 32 is of a combustion type or a cold gas type, and is configured to supply gas generated by being operated 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 its longitudinal direction. The outlet 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.

A flat pattern of the side airbag 34 is shown in FIG. The side airbag 34 is constructed of two base fabrics cut out of, for example, nylon or polyester fabric. The side airbag 34 is formed into a bag by sewing the peripheral edges of two overlapping base fabrics at a seam T. An inflator insertion opening 34A for inserting the inflator 32 (see FIG. 1) is formed at the rear and lower side of the side airbag 34.

The side airbag 34 is located inside the seatback 16 shown in FIG. 6 in the folded state, from the side 16S on the outside in the vehicle width direction to one shoulder 16A side that is continuous therewith, and has an inverted L shape when viewed from the front of the seat. It is stored in a letter shape. As shown in FIG. 1, the side airbag 34 receives gas supply from the inflator 32, protrudes from inside the seatback 16 toward the front of the seat, and is inflated and deployed on the outside of the seated occupant D in the vehicle width direction. The side airbag 34 includes an upper chamber 34H that is inflated and deployed so as to contact the rear surface of the upper part 22S1 of the shoulder belt 22S to reach the lateral side with respect to the head H of the seated occupant D, and the lateral side with respect to the lumbar region P of the seated occupant D. It includes a lower chamber 34P that is inflated and deployed on the side. In FIG. 3, the range of the upper chamber 34H is surrounded by a chain double-dashed line A, and the range of the lower chamber 34P is surrounded by a chain double-dashed line B. The upper chamber 34H and the lower chamber 34P are connected in a communicating state by a connecting portion 34D.

As shown in FIG. 1, the connecting portion 34D is formed with a hollow portion 36 that is hollowed out 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 hollowed portion 36. Furthermore, the hollowed out portion 36 is formed, for example, by cutting the base fabric into a V-shape.

The rear end side of a cylindrical sock (duct, diffuser) 38 is sewn to the rear part of the inside of the side airbag 34 shown in FIG. The sock 38 extends in the vertical direction of the seat, and the opening area of the passageway on the lower side is set larger than the opening area of the passageway on the upper side. The sock 38 is disposed on the front side with respect to the inflator 32, and is configured such that a lower portion of the sock 38 communicates with the jet port of the inflator 32. The upper spout 38A of the sock 38 is arranged inside the upper chamber 34H, and the lower spout 38B of the sock 38 is arranged inside the lower chamber 34P. As a result, the sock 38 supplies gas from the inflator 32 to the upper chamber 34H and the lower chamber 34P.

The upper blowout port 38A of the sock 38 is configured to blow out gas toward the front side of the seat. In this embodiment, the upper spout 38A of the sock 38 is cut obliquely so as to face diagonally upward in front of the seat. As shown in FIG. 2, the upper spout 38A of the sock 38 connects the shoulder belt 22S with the head H of the seated occupant D near the lateral side of the head H of the seated occupant D when the side airbag 34 is inflated and deployed. placed between. In other words, the upper spout 38A of the sock 38 is arranged near the side of the headrest stay 18S when the side airbag 34 is inflated and deployed.

The lower blowout port 38B of the sock 38 is configured to blow out gas toward the lower side of the seat. In this embodiment, the lower spout 38B of the sock 38 is cut substantially horizontally so as to face the lower side of the seat. The lower outlet 38B of the sock 38 is arranged near the side support portion 14S of the seat cushion 14 when the side airbag 34 is inflated and deployed.

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

FIG. 4A schematically shows the folded state of the upper chamber 34H (more specifically, the portion along line 4A-4A in FIG. 3) of the side airbag 34 in the flat state shown in FIG. Shown in an enlarged cross-sectional view. In FIG. 4A, a part of the cross section taken along line 4A-4A in FIG. 3 is simplified and shown by a two-dot chain line. Further, FIG. 4B schematically shows the folded state of the lower chamber 34P (more specifically, the portion along the line 4B-4B in FIG. 3) of the side airbag 34 in the flat state shown in FIG. 3. It is shown in an enlarged cross-sectional view. In FIG. 4B, a part of the cross section taken along line 4B-4B in FIG. 3 is simplified and shown by a two-dot chain line. In addition, in the folded state diagrams shown in FIGS. 4A and 4B, the cross sections of the pair of overlapping and sewn base fabrics are collectively shown as a single thick line in order to make the diagrams easier to read. Note that the arrow FR and the arrow IN in FIGS. 4A and 4B indicate the direction in which the side airbag 34 is unfolded when the side airbag 34 is inflated and deployed (in FIGS. 7A and 7B, which will be described later). (same as well). As shown in FIGS. 4A and 4B, the upper chamber 34H and the lower chamber 34P are folded in different ways.

As shown in FIG. 4A, the upper chamber 34H is folded from the front side of the seat toward the rear side of the seat by roll folding, in which the surface facing the seated occupant D (upper side in FIG. 4A) is folded inward. An inner roll folding portion 34R is provided. In this embodiment, the entire upper chamber 34H in the folded state is configured with an inner roll folded portion 34R.

On the other hand, as shown in FIG. 4B, the lower chamber 34P is folded from the front side of the seat toward the rear side of the seat by a bellows fold (Z-fold) in which the folding direction is alternately changed and folded in the front-rear direction of the seat. A section 34S is provided. In this embodiment, the entire lower chamber 34P in the folded state is constituted by a bellows folded portion 34S. That is, the lower chamber 34P is folded in such a way that the expansion speed when inflated 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, one longitudinal end of a tether 40 (not shown except in FIG. 3) is attached to the rear edge 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 and 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 a collision sensor 52.

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

(Actions and effects of embodiments)
Next, the functions and effects of the above embodiment will be explained.

When the ECU 50 detects or predicts a side collision based on information from the collision sensor 52, it operates the inflator 32. As a result, when the side airbag 34 receives gas supply, the side airbag 34 is inflated and deployed on the outside in the vehicle width direction relative to the seated occupant D, as shown in FIGS. 1 and 2. At this time, the upper chamber 34H constituting a part of the side airbag 34 is inflated and deployed so as to come into contact with the rear surface of the upper part 22S1 of the shoulder belt 22S and reach the lateral side of the head H of the seated occupant D. Thereby, 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 when receiving no reaction force from the shoulder belt 22S, and the capacity required for the restraint can also be small. On the other hand, the lower chamber 34P, which constitutes another part of the side airbag 34, is inflated and deployed on the lateral side with respect to the waist P of the seated occupant D.

Further, as shown in FIG. 1, a gouged portion 36 that is gouged from the front side of the seat to the rear side of the seat is formed in the connecting portion 34D that connects the upper chamber 34H and the lower chamber 34P. This allows the upper chamber 34H and the lower chamber 34P to be folded in different ways. In the present embodiment, the lower chamber 34P is folded in such a manner that the expansion speed when inflated and expanded is faster than that of the upper chamber 34H. Therefore, when the side airbag 34 receives gas supply, the lower chamber 34P is inflated 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 formed by roll folding in which the surface facing the seated occupant D (upper side in FIG. 4A) is folded inward. It is folded. Therefore, when the inner roll folded portion 34R of the upper chamber 34H is expanded and expanded, the portions of the inner roll folded portion 34R of the upper chamber 34H that are sequentially unrolled are placed on the side of the seated occupant D (upper side in the drawing of FIG. 4A). Since the upper chamber 34H is in the middle of being inflated and deployed, it can be prevented from being caught by the shoulder belt 22S shown in FIG. 2. 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 toward the rear side of the seat by a bellows-folding method in which the folding directions are alternately changed and folded in the front-rear direction of the seat. . Therefore, the lower chamber 34P supplied with gas can be quickly expanded and expanded into the narrow space between the seated occupant D and the side door trim 60 shown in FIG.

Note that when the gouge portion 36 is formed in the connecting portion 34D shown in FIG. 1 etc., the rigidity of the side airbag 34 in the inflated and deployed state is reduced by that amount. However, as shown in FIG. 2, in order to bring the lower part of the upper chamber 34H into contact with the rear surface of the upper part 22S1 of the shoulder belt 22S when the side airbag 34 is inflated and deployed, the connecting part 34D is connected to the lower chamber 34P. On the other hand, since the sheet needs to be bent inward in the width direction, the aforementioned decrease in rigidity can be effectively utilized.

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

(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 sectional view of a modified example of how the upper chamber 34H is folded, and FIG. 7B shows a sectional view of a modified example of how the lower chamber 34P is folded. In addition, in FIGS. 7A and 7B, the cross section of the base fabric is simplified and shown as a thick line, the sewing part is not shown, and the inner gap is exaggerated to make the drawings easier to see. Further, for convenience, the upper chamber 34H and the lower chamber 34P are given the same reference numerals as in the above embodiment.

As a modification of the above embodiment, the upper chamber 34H includes a cactus folding portion 34X folded by the cactus fold shown in FIG. 7A, and the seated occupant D side (in FIG. 7A, The structure may include an inner roll folding portion that is folded from the front side of the sheet toward the rear side of the seat by roll folding so that the upper side surface is rolled inward (see the direction of arrow C indicated by the two-dot chain line).

In addition, as another modification of the above embodiment, the lower chamber 34P includes a cactus folding portion 34Y folded by the cactus fold shown in FIG. As shown by Z, the sheet may be configured to have a bellows-folding portion folded from the front side of the sheet toward the rear side of the sheet by folding the sheets in the front-rear direction while alternating the folding directions.

The cactus folded portions 34X and 34Y shown in FIGS. 7A and 7B are provided at the front side in the longitudinal direction of the seat when the side airbag 34 is inflated and deployed. The cactus folding portions 34X and 34Y are folded by a cactus folding method in which a portion of the front side of the side airbag 34 is inserted into the other portion of the side airbag 34 in a folded state. Note that cactus folding is well known, for example, in Japanese Patent No. 3357937, so detailed explanation will be omitted. The above two modified examples have the same configuration as the above embodiment except that the way the side airbag 34 is folded is different. Incidentally, the folding method shown by solid lines in FIGS. 7A and 7B may also be understood as an inward fold.

By adding the cactus folds 34X and 34Y as the folds as in the above modification, it is possible to increase the variations in the inflation and deployment methods that can be set in the side airbag 34. Therefore, it is easy to adjust and set the way the side airbag 34 is inflated and deployed, for example, depending on the configurations of the seatback 16 and the seatbelt device 20 (see FIGS. 1 and 2).

Further, as another modification of the above embodiment, the entire lower chamber (34P) may be folded in a cactus fold. That is, the upper chamber (34H) may be folded by roll folding, and the lower chamber (34P) may be folded by cactus folding. Note that the cactus-folded portion has a faster expansion speed when expanded and expanded 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 pretensioner 28 when a side collision is detected or predicted based on information from the collision sensor 52. Good too.

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

Note that the above-described embodiment and the above-described modification examples can be implemented in appropriate combinations.

Although one example of the present invention has been described above, the present invention is not limited to the above, and it goes without saying that the present invention can be implemented with various modifications other than the above without departing from the spirit thereof. .

10 Occupant protection device 16 Seat back 20 Seat belt device 22L Lap belt 22S Shoulder belt 22S1 Upper part of shoulder belt 34 Side airbag 34D Connecting part 34H Upper chamber 34P Lower chamber 34R Inner roll fold part 34S Bellows fold part 34X Cactus fold part 34Y Cactus Folding part 36 Hole part D Seated passenger H Head P Waist part

Claims (3)

a three-point seat belt device that restrains the lower back of a seated occupant with a lap belt and restrains the upper body of a seated occupant with a shoulder belt;
an upper part that is stored in a seat back in a folded state and is inflated and deployed by gas supply, and is inflated and deployed so as to come into contact with the rear surface of the upper part of the shoulder belt and reach the lateral side of the seated occupant's head; a side airbag comprising a chamber, a lower chamber that is inflated and deployed on the side of the waist of a seated occupant, and a connecting portion that connects the upper chamber and the lower chamber;
has
A gouged part is formed in the connecting part from the front side of the seat to the rear side of the seat, and the gouged part is set to be disposed on the outside in the seat width direction with respect to the upper part of the shoulder belt. ,
In the occupant protection device, the lower chamber is folded in such a way that the lower chamber is folded at a faster deployment speed when inflated and deployed than the upper chamber. The upper chamber includes an inner roll folding portion that is folded from the front side of the seat toward the rear side of the seat by roll folding so that the surface facing the seated passenger is folded inward;
2. 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 toward the rear side of the seat by folding the lower chamber in the front-rear direction of the seat while alternating folding directions. At least one of the upper chamber and the lower chamber includes a cactus folded portion folded by cactus folding, and the cactus folded portion is disposed on the front side in the longitudinal direction of the seat when the side airbag is inflated and deployed. 3. The occupant protection device according to claim 2, wherein the occupant protection device is provided at a location where the passenger protects the vehicle.