JP6825516B2 - Airbag device with vehicle seat - Google Patents

Description

The present invention relates to an airbag device with a vehicle seat.

Conventionally, there has been known a vehicle front airbag device that restrains the upper body of a seated occupant (hereinafter, simply referred to as "occupant") by receiving a reaction force from an instrument panel or a steering column.

Here, in recent years, the instrument panel has been reduced in size due to a request for expansion of the vehicle interior space. In this case, since the upper body of the occupant is moved away from the instrument panel, it is necessary to increase the size of the front airbag of the vehicle front airbag device in the front-rear direction of the vehicle.

Further, as the automatic driving of passenger cars progresses in recent years, it is assumed that the vehicle seats are used by rotating them in the opposite directions. In this case, the front airbag cannot receive the reaction force from the instrument panel or the like, and the reaction force surface is lost. Therefore, it is desired to create an airbag device with a seat that can independently secure the reaction force and restrain the upper body of the occupant, instead of seeking the reaction force from the instrument panel, the steering column, or the like.

Against the above background, it will be examined below whether the airbag device described in Patent Document 1 below can be applied. In this prior art, chest protection actuators are incorporated on the left and right sides of the seat back provided in the vehicle seat. In this airbag device with a seat, a pair of bag bodies included in the chest protection actuator are shifted to an expansion / deployment form protruding from the surface of the seat back by receiving gas from the second gas generator. In the expanded and deployed form of the pair of bags, the bags are bent by the movable rail in the chest protection actuator. As a result, the pair of bags wraps around the side of the occupant's chest to the front side (more specifically, through the occupant's armpit to the front lower end of the ribs), and the occupant's chest is on the back side. Hold it from and restrain it. Further, a planar fastener as a connecting means is provided on the tip end side of the pair of bag bodies so that the tip end sides of the bag bodies are connected to each other.

JP-A-2009-154812

However, in the prior art described in Patent Document 1, when a load on the front side of the seat is input to the pair of bag bodies from the upper body of the occupant who is trying to inertially move at the time of a frontal collision, the planar fasteners of each other are peeled off. It is conceivable that the bonded state of the pair of bags cannot be obtained. In other words, it is very difficult to maintain the state of connection between the pair of left and right bag bodies, and it is considered that further improvement is necessary to sufficiently restrain the upper body of the occupant.

In consideration of the above facts, an object of the present invention is to obtain an airbag device with a vehicle seat that can sufficiently restrain the upper body of an occupant in the event of a vehicle collision.

The airbag device with a vehicle seat according to the first aspect of the invention is provided on both sides of the seat back of the vehicle seat in the seat width direction, and expands and expands to cover at least the front surfaces of both left and right shoulders of the seated occupant. A plurality of airbags that overlap so as to cover and surround the left and right shoulders of the seated occupant with the seat back, and the plurality of airbags are provided on the surface of the overlapping portion, and are more than the other portions of the airbag. The plurality of airbags have a friction surface having a high friction coefficient, the plurality of airbags include a first bag, a second bag, and a third bag, and the first bag is one side of the seat back in the seat width direction. The second bag and the third bag are provided on the portion and are extended in a rod shape from one side portion to the other side portion so as to cover the front surfaces of the left and right shoulders of the seated occupant by expanding and expanding. The bag is provided on one side portion and the other side portion of the seat back , respectively, expands and expands so as to wrap both ends in the extending direction of the first bag, and engages with the both ends. It is configured in.

In the present invention according to claim 1, a plurality of airbags are provided on both sides of the seat back in the seat width direction. The plurality of airbags are inflated and expanded so as to cover at least the front surfaces of the left and right shoulders of the seated occupant, and the seat bag surrounds the left and right shoulders of the occupant. Further, on the surface of the portion where the plurality of airbags overlap, a friction surface having a friction coefficient set higher than that of other portions in the plurality of airbags is provided. Therefore, the frictional force received from the friction surface limits the movement of each airbag from its inflated position. As a result, even if a load is input to the airbag from the upper body of the occupant due to the inertial movement of the seated occupant in the event of a vehicle collision, the reaction force can be received from the airbag, effectively restraining the upper body of the occupant. Can be done.

As described above, according to the airbag device with a vehicle seat according to the present invention, the upper body of the occupant can be sufficiently restrained in the event of a vehicle collision.

It is a perspective view which shows the vehicle seat provided with the airbag device with a vehicle seat which concerns on 1st Embodiment in the state which the airbag device with a seat is activated. It is a top view of the vehicle seat in the state before the airbag device with a seat shown in FIG. 1 is activated. (A) is a schematic plan view of an airbag device with a seat showing a state in which the first bag is expanded and expanded first among a plurality of airbags, and (B) is a schematic plan view of an airbag device with a seat in which the second bag is expanded and expanded following the first bag. It is the schematic plan view of the airbag device with a seat which shows the state which was done. (A) is a schematic diagram showing an enlarged state before the two coat base fabrics overlap, and (B) is a schematic diagram showing an enlarged state after the two coat base fabrics overlap. .. (A) is a partially enlarged plan view showing the uneven shape of the friction surface of the coat base cloth shown in FIG. 4 (A), and (B) to (E) are deformations of the uneven shape of the friction surface of the coat base cloth. It is a partially enlarged plan view which shows each example. It is a perspective view corresponding to FIG. 1 which shows the vehicle seat provided with the airbag device with a vehicle seat which concerns on 2nd Embodiment in the state which the airbag device with a seat is activated. It is a perspective view corresponding to FIG. 1 which shows the vehicle seat provided with the vehicle-equipped airbag device according to the third embodiment in a state where the seat-equipped airbag device is operated.

<First Embodiment>
Hereinafter, the airbag device 10 with a vehicle seat according to the first embodiment will be described with reference to FIGS. 1 to 5. The arrow FR appropriately described in the drawing indicates the front side of the vehicle, the arrow UP indicates the upper side of the vehicle, and the arrow OUT indicates the outside in the vehicle width direction. In addition, when the explanation is simply made using the front-rear, up-down, and left-right directions, unless otherwise specified, it indicates the front-rear direction of the vehicle front-rear direction, the up-down direction of the vehicle up-down direction, and the left-right direction when facing the front of the vehicle front-rear direction. And.

(Configuration of airbag device with vehicle seat)
As shown in FIGS. 1 and 2, the airbag device 10 with a vehicle seat according to the present embodiment (hereinafter, simply referred to as “airbag device 10”) is mounted on the vehicle seat 12. It includes airbag modules 32L and 32R, first bag 20 and second bag 22 as a plurality of airbags, and inflators 24L and 24R as gas supply means.

The vehicle seat 12 supports the seat cushion 16 that supports the occupant's waist L (including the buttocks here) and the thigh D, and the occupant's back B that is tiltably supported by the rear end of the seat cushion 16. It is composed of a seat back 14 and a head rest 18 provided on the upper end of the seat back 14 so as to be movable up and down to support the occupant's head H. The vehicle seat 12 is a passenger seat for a right-hand drive person. Further, in the present embodiment, the seat front-rear direction of the vehicle seat 12 coincides with the vehicle front-rear direction, and the seat width direction of the vehicle seat 12 coincides with the vehicle vehicle width direction. Unless otherwise specified, in this embodiment, the orientation of the vehicle and the orientation of the seat are assumed to be the same.

Supplementally, each figure shows a state in which a dummy (doll) for a collision test is seated on the seat cushion 16 of the vehicle seat 12 as a model of the occupant to be protected. This dummy 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, the dummy will be regarded as an occupant and will be referred to as "occupant P".

The seat back 14 of the vehicle seat 12 described above includes a seat back frame (not shown) whose lower end is supported by the rear end of the seat cushion 16 in the vehicle front-rear direction, and a seat back pad (not shown) supported by the seat back frame. It is composed of a seat back skin 30 that covers the surface of the seat back pad.

Here, on the front end side of both side surfaces of the seat back skin 30 in the seat width direction, a skin cleft portion (not shown) that breaks and tears when a predetermined bag expansion pressure acts is formed. Further, in the seat back pad, the airbag modules 32L and 32R are housed on the rear side of the seat in the skin tear portion. In the 32L on the left side when viewed from the occupant P, the first bag 20 described later is stored in a folded state, and the inflator 24L that supplies gas to the first bag 20 and a cylindrical diffuser that is a rectifying means (illustrated). Omitted) etc. are stored. On the other hand, in the 32R on the right side when viewed from the occupant P, the second bag 22 described later is stored in a folded state, and the inflator 24R that supplies gas to the second bag 22 and the cylindrical diffuser that is a rectifying means. (Not shown) etc. are stored.

By the way, a stud bolt (not shown) is erected from the diffuser located on the left side when viewed from the occupant P, and this stud bolt is nut-tightened to the left side frame of the seat back frame described above to make the airbag. The module 32L is attached to the left side frame. Similarly, a stud bolt (not shown) is erected from the diffuser located on the right side when viewed from the occupant P, and the stud bolt is nut-tightened to the side frame on the right side of the seat back frame described above to provide air. The bag module 32R is attached to the right side frame.

As shown in FIG. 2, the above-mentioned inflators 24L and 24R are electrically connected to the ECU 26 mounted on the vehicle. The ECU 26 is also electrically connected to a collision detection sensor (not shown) that detects a vehicle collision. As the collision detection sensor, for example, an acceleration sensor that detects the acceleration of the vehicle can be used. The ECU 26 determines whether or not the vehicle has collided based on a detection signal from a collision sensor (not shown), and if it is determined that the vehicle has collided, the inflators 24L and 24R are operated. A collision prediction sensor such as a pre-crash sensor for predicting a vehicle collision may be electrically connected to the ECU 26, or both the collision detection sensor and the collision prediction sensor may be electrically connected. Good.

By operating the inflators 24L and 24R, gas is ejected from a gas ejection portion (not shown) provided at the end of each inflator. As a result, gas is supplied to the first bag 20 and the second bag 22 through a diffuser (not shown).

Here, in the present embodiment, the timing of supplying gas from the inflators 24L and 24R to the first bag 20 and the second bag 22 is set by electrical control in the ECU 26. Specifically, the gas is supplied to the first bag 20 before the second bag 22. Therefore, the expansion of the second bag 22 is completed later than that of the first bag 20.

Next, the first bag 20 and the second bag 22 will be described in detail.

As shown in FIGS. 1 and 3, the first bag 20 is configured as a bottomed tubular bag body in which the tip portion in the longitudinal direction is closed. That is, the longitudinal base end of the first bag 20 is opened to form an open end 20A (see FIG. 3A), and the longitudinal tip is closed to form a closed end 20B. .. The inflator 24L is inserted from the opening end 20A of the first bag 20, and the opening end 20A is fastened together with the inflator 24L to the left side frame of the seat back frame.

Further, the first bag 20 has a rod-like body that is curved so as to be convex toward the front of the seat with the front-rear direction of the seat as the thickness direction in the expanded and unfolded state. Then, the seat back 14 extends downward from the left side portion in the seat width direction to the right side portion in the seat width direction (see FIG. 1). As a result, the occupant P is arranged so as to cover the front surface of the left shoulder, the front surface of the chest, and the front surface of the right side of the abdomen.

On the other hand, the second bag 22 is configured as a bottomed tubular bag body in which the tip portion in the longitudinal direction is closed, similarly to the first bag 20. That is, the longitudinal base end of the second bag 22 is opened to form an open end 22A (see FIG. 3B), and the longitudinal tip is closed to form a closed end 22B. .. The inflator 24R is inserted from the opening end 22A of the second bag 22, and the opening end 22A is fastened together with the inflator 24R to the right side frame of the seat back frame.

Further, the second bag 22 has a rod-like body that is curved so as to be convex toward the front of the seat with the front-rear direction of the seat as the thickness direction in the expanded and unfolded state. Then, the seat back 14 extends downward from the right side portion in the seat width direction to the left side portion in the seat width direction (see FIG. 1). As a result, the occupant P is arranged so as to cover the front surface of the right shoulder, the front surface of the chest, and the left front surface of the abdomen.

In the state where the first bag 20 and the second bag 22 are expanded and expanded, the second bag 22 is arranged so as to overlap the first bag 20 in a sash shape from the front of the seat (FIGS. 1 and 3 (B)). reference). Further, a coat base cloth 40 as a friction surface is attached to the surface of the portion where the first bag 20 and the second bag 22 overlap each other by sewing or the like. As will be described later, in the portion where the first bag 20 and the second bag 22 overlap, the friction coefficient is set to be higher than the other portions in the first bag 20 and the second bag 22 by the coat base cloth 40. Therefore, even if the coat base fabrics 40 of the first bag 20 and the second bag 22 are frictionally engaged with each other and the first bag 20 is pressed toward the front side of the seat, the first bag 20 is the second bag. The state of being engaged with the 22 is maintained, and the movement of the upper body of the occupant from the position at the time of expansion and deployment in the direction of action of the inertial force is suppressed.

The first bag 20 and the second bag 22 described above are made of nylon 66 or a polyester-based material.

Here, the coat base cloth 40 will be specifically described.

As described above, the coat base cloth 40 is arranged on the surface of the portion where the first bag 20 and the second bag 22 overlap when viewed from the front side of the seat. The coat base cloth 40 is composed of a coat base cloth 40A on the first bag 20 side and a coat base cloth 40B on the second bag 22 side, each of which is cut into a rectangular shape. These coated base cloths 40A and 40B are cloths in which silicon rubber or the like is coated on the same cloth material as the airbag base cloth, and the joint surface 42 not coated with silicon rubber or the like and silicon rubber or the like are coated. It is provided with a friction surface 44.

The coat base cloth 40A is joined to the front side surface of the seat of the first bag 20 by sewing or the like. The Kor base cloth 40A is set in a range located in front of the chest of the occupant P. On the other hand, the coat base cloth 40B is joined to the rear side surface of the seat of the second bag 22 by sewing or the like. The coat base cloth 40B is also set in a range located in front of the chest of the occupant P, similarly to the coat base cloth 40A. The coat base cloth 40A of the first bag 20 and the coat base cloth 40B of the second bag 22 described above are configured so that the friction surfaces 44 come into contact with each other in the expanded and deployed state of the first bag 20 and the second bag 22. Has been done.

As shown in FIGS. 4A and 4B, the above-mentioned friction surface 44 is provided with an uneven shape, and the coating base cloth 40A is provided at a portion where the first bag 20 and the second bag 22 overlap. The uneven shape of the friction surface 44 and the friction surface 44 of the coat base cloth 40B are overlapped and fitted.

As shown in FIG. 4A, in the present embodiment, a plurality of convex portions 46 are repeatedly formed on each friction surface 44 at predetermined intervals. Each convex portion 46 has a band shape and is arranged so as to be substantially parallel to each other at regular intervals. Therefore, the friction surface 44 is provided with a striped uneven shape (see FIG. 5A). However, the width of the convex portion 46 is set to be narrower than the width of the concave portion 47. The convex portion 46 is fitted into the concave portion 47 at a portion where the first bag 20 and the second bag 22 overlap each other. In this way, the portion where the first bag 20 and the second bag 22 overlap is set to have a higher coefficient of friction than the other portions in the first bag 20 and the second bag 22 by the coat base cloth 40.

The uneven shape of the coat base cloth 40 is not limited to the striped shape, and various shapes can be adopted. For example, as shown in FIGS. 5 (B) to 5 (E), a horizontal stripe shape, a chevron shape, a wavy shape, a zigzag shape, or the like may be used. Further, the range and size of the coat base fabrics 40A and 40B to be joined may be appropriately set in consideration of the arrangement relationship between the first bag 20 and the second bag 22.

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

In the airbag device 10 of the present embodiment, when various sensors (not shown) detect or predict a vehicle collision, the ECU 26 operates the inflators 24L and 24R to generate gas. Then, the gas ejected from the inflators 24L and 24R flows into the first bag 20 and the second bag 22 through a diffuser (not shown). Here, first, gas is supplied to the first bag 20 to expand and expand. The first bag 20 extends in a sash shape while being inclined downward from the left side portion in the seat width direction to the right side portion in the seat width direction of the seat back 14. As a result, the occupant P covers the front surface of the left shoulder, the front surface of the chest, and the front surface of the right side of the abdomen.

Next, gas is supplied to the second bag 22 to expand and expand. The second bag 22 extends downward from the right side portion in the seat width direction to the left side portion in the seat width direction of the seat back 14, and overlaps the first bag 20 in a sash shape from the front of the seat. .. Then, it covers the front of the left side of the abdomen from the front of the right shoulder of the occupant P through the front of the chest. When the first bag 20 and the second bag 22 are expanded and expanded in this way, the left and right shoulders of the occupant P are surrounded by the first bag 20, the second bag 22, and the seat back 14.

At this time, at the portion where the first bag 20 and the second bag 22 overlap, the uneven shapes of the friction surface 44 of the coat base cloth 40A and the friction surface 44 of the coat base cloth 40B overlap each other. Then, even if the upper body of the occupant P who is about to inertially move pushes the first bag 20 toward the front side of the seat at the time of a vehicle collision, the frictional force generated on the friction surface 44 causes the first bag 20 to move to the second bag 22. The state of frictional engagement with the bag is maintained. As a result, the upper body of the occupant P can be firmly restrained by receiving a reaction force from the second bag 22 against the load input from the occupant P.

Further, since the first bag 20 and the second bag 22 expand and expand so as to cover the front surfaces of both shoulders, the front chest, and the left and right front surfaces of the abdomen of the occupant P, the main part of the body of the occupant P is seen from the colliding body and the like. Can be effectively protected.

Further, the first bag 20 and the second bag 22 can be expanded and expanded into a rod-shaped body that is curved so as to be convex toward the front of the seat, so that the contact area with the upper body of the occupant P can be expanded. As a result, the force of the airbag device 10 to restrain the upper body of the occupant P is increased.

Further, in the present embodiment, since the expansion of the second bag 22 is completed later than the first bag 20, it is possible to prevent the first bag 20 and the second bag 22 from interfering with each other during the expansion and deployment. As a result, the second bag 22 can be stably superposed on the first bag 20.

Further, the airbag device 10 is provided on the vehicle seat 12 and can restrain the upper body of the occupant P without depending on other configurations provided inside the vehicle. As a result, compared with the case where the front airbag is provided on the instrument panel or the steering column in the vehicle interior, space saving and cost reduction can be achieved, and the degree of freedom in designing the vehicle interior can be increased.

Further, since the first bag 20 and the second bag 22 of the present embodiment are housed between the side surface of the seat back pad and the seat back skin 30, the design of the vehicle seat 12 is improved.

<Second Embodiment>
Next, the airbag device 50 with a vehicle seat according to the second embodiment will be described with reference to FIG. The same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

As shown in FIG. 6, the vehicle airbag device 50 of the present embodiment has a first structure such that the airbag device 50 with a vehicle seat overlaps substantially in parallel along the seat width direction when the state at the time of expansion and deployment is viewed from the front of the seat. The feature is that the bag 52 and the second bag 54 are arranged.

Specifically, the first bag 52 is provided on the left side portion of the seat back 14 in the seat width direction, and the second bag 54 is provided on the right side portion of the seat back 14 in the seat width direction. The first bag 52 and the second bag 54 are each configured as a bottomed tubular bag body whose tip portion in the longitudinal direction is closed. Further, an inflator (not shown) as a means for supplying gas is inserted from each opening end of the first bag 52 and the second bag 54, and the gas is supplied from the inflator at the time of a vehicle collision to expand and expand. ing.

The first bag 52 and the second bag 54 in the expanded and deployed state form a substantially L-shaped rod-shaped body in a plan view, and are formed in a pair of arms. In other words, the first bag 52 extends from the left side portion of the seat back 14 in the seat width direction to the front of the seat, and then is bent linearly to the right in the seat width direction. Further, the second bag 54 extends linearly to the left in the seat width direction after extending from the right side portion in the seat width direction of the seat back 14 to the front of the seat. And. When viewed from the front of the seat, the structure is such that the second bag 54 is overlapped in front of the first bag 52. A sheet-shaped coat base cloth 40 cut into a rectangular shape is attached to the surface of the portion where the first bag 52 and the second bag 52 overlap by sewing or the like, and the friction of these coat base cloths 40 is attached. The surfaces are configured to come into contact with each other. As a result, even if the first bag 52 is pressed toward the front side of the seat, the first bag 52 is maintained in a state of being frictionally engaged with the second bag 54, and from the inflated position of the first bag 52. The movement of the bag is suppressed.

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

In the airbag device 50 with a vehicle seat of the present embodiment, when a vehicle collides, the ECU 26 operates an inflator to generate gas. At this time, the first bag 52 expands and expands first, and extends in an L shape from the left side portion in the seat width direction to the right side portion of the seat back 14 so as to cover the front surfaces of the left and right shoulders of the occupant P. .. Next, the second bag 54 expands and expands, extends in an L shape from the right side portion in the seat width direction to the left side portion of the seat back 14, and is superposed on the first bag 52 from the front of the seat. As a result, the left and right shoulders of the occupant P are surrounded by the first bag 52, the second bag 54, and the seat back 14.

Further, at the portion where the first bag 52 and the second bag 54 overlap, the friction surfaces of the respective coat base fabrics 40 come into contact with each other. Therefore, the frictional force generated at the site causes the first bag 52 to be in a state of frictionally engaging with the second bag 54. Then, at the time of a vehicle collision, the first bag 54 is pressed toward the front side of the seat by inputting a load from the occupant P who is about to inertially move to the first bag 52. At this time, the first bag 52 is input from the occupant P because the first bag 52 maintains the state of being frictionally engaged with the second bag 54 and is suppressed from moving from the position at the time of expansion and deployment in the direction of action of the inertial force. The reaction force can be received from the second bag 54 against the applied load. As a result, the upper body of the occupant P can be restrained.

Other actions and effects are the same as those in the first embodiment.

<Third Embodiment>
Next, the airbag device 60 with a vehicle seat according to the third embodiment will be described with reference to FIG. 7. The same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

As shown in FIG. 7, the vehicle airbag device 60 of the present embodiment includes a seat back 14, a first bag 62, a second bag 66, and a third bag 68. ..

Specifically, the first bag 62 is provided on the left side portion of the seat back 14 in the seat width direction, is located above the seat above the first bag 62, and is located on the right side portion of the seat back 14 in the seat width direction. A bag 66 is provided. Further, the third bag 68 is provided above the seat above the first bag 62 and on the left side portion of the seat back 14 in the seat width direction. The first bag 62 is configured as a bottomed tubular bag body whose tip portion in the longitudinal direction is closed. Further, in the expanded and expanded state, after extending from the left side portion of the seat back 14 to the front of the seat, it extends linearly to the right in the seat width direction, and the straight portion 64 along the seat width direction is the occupant. It is configured to cover the front surfaces of both the left and right shoulders of P. On the other hand, the second bag 66 and the third bag 68 are formed in a substantially C shape in which the lower rear side of the vehicle is opened in a side view in the expanded and deployed state. Further, the base end portion of the second bag 66 and the third bag 68 in the longitudinal direction is opened to be an open end portion, and the tip end portion in the longitudinal direction is closed to be a closed end portion.

In a state where the first bag 62 and the pair of left and right second bags 66 and the third bag 68 are expanded and expanded, the straight portion 64 of the first bag 62 penetrates the central portion of the second bag 66 and the third bag 68. It is arranged in the state. Due to this penetrating arrangement, even if the straight portion 64 of the first bag 62 is pressed toward the front side of the seat, the straight portion 64 is maintained in a state of being engaged with the second bag 66, and the straight portion 64 is the second bag. It is designed so that it does not deviate from 66. Here, when viewed from the front side of the seat, a sheet-shaped coat base cloth 40 cut into a rectangular shape is formed at a portion where the straight portion 64 of the first bag 62 and the second bag 66 and the third bag 68 overlap each other. It is attached by sewing or the like. Then, when the first bag 62 and the pair of left and right second bags 66 and the third bag 68 are expanded and deployed, the friction surfaces of the respective coat base fabrics 40 are brought into contact with each other. As a result, the portion where the straight portion 64 of the first bag 62 and the second bag 66 and the third bag 68 overlap has higher friction than the other parts of the first bag 62, the second bag 66, and the third bag 68. It is set to the coefficient.

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

In the airbag device 60 with a vehicle seat of the present embodiment, when a vehicle collides, the ECU 26 operates an inflator to generate gas. At this time, gas is first supplied to the first bag 62 to expand and expand. The first bag 62 extends in a rod shape from the left side portion to the right side portion in the seat width direction of the seat back 14. As a result, the front surfaces of the left and right shoulders of the occupant P are covered. Next, gas is simultaneously supplied to the second bag 66 and the third bag 68 to expand and expand. The second bag 66 and the third bag 68 expand and expand so that both ends of the straight portion 64 constituting the first bag 62 are involved from the rear of the seat. That is, the straight portion 64 of the first bag 62 penetrates the central portion of the second bag 66 and the third bag 68, and the first bag 62 is in a state of being engaged with the second bag 66 and the third bag 68. .. Then, even if the upper body of the occupant P who is about to inertially move pushes the first bag 62 toward the front side of the seat at the time of a vehicle collision, the straight portion 64 is engaged with the second bag 66 and the third bag 68. It is maintained and the straight portion 64 does not come off the second bag 66 and the third bag 68. Therefore, the upper body of the occupant P can be firmly restrained by receiving the reaction force from the second bag 66 and the third bag 68 with respect to the load input from the occupant P.

Further, at the portion where the first bag 62, the second bag 66, and the third bag 68 overlap, the friction surfaces of the respective coat base fabrics 40 come into contact with each other and are frictionally engaged with each other. As a result, the reaction force received by the first bag 62 from the second bag 66 and the third bag 68 can be improved.

Other actions and effects are the same as those in the first embodiment.

In the first to third embodiments described above, the first bag 20 and the second bag 22 (first embodiment), the first bag 52 and the second bag 54 (second embodiment) are in the expanded and deployed state. ), The first bag 62, the second bag 66, and the third bag 68 (third embodiment) are in contact with each other at the overlapping portion, but the present invention is not limited to this, and a plurality of airbags are brought close to each other at the overlapping portion. It may be arranged so that the airbags come into contact with each other immediately after being deformed by the inertial movement of the occupant P.

Further, in the first to third embodiments, the first bag 20 and the second bag 22 (first embodiment), the first bag 52 and the second bag 54 (second embodiment), and the first bag 62 A coated base cloth 40 having an uneven shape was joined to a portion where the second bag 66 and the third bag 68 (third embodiment) overlap, and the friction coefficient was improved by superimposing them, but the present invention is not limited to this. For example, a rough base cloth with a rough surface is provided at the part where a plurality of airbags overlap to improve the friction coefficient, or silicon rubber or the like is directly applied to the air bag base cloth to contact the part with high viscosity and high elasticity. And the friction coefficient may be improved.

Further, in the first embodiment and the second embodiment, the first bag 20 (first embodiment) and the first bag 52 (second embodiment) are provided on the left side portion of the seat back 14 in the seat width direction. The two bags 22 (first embodiment) and the second bag 54 (second embodiment) are provided on the right side portion of the seat back 14 in the seat width direction, but the present invention is not limited to this, and the second bag 54 (second embodiment) is provided on the right side portion. 1 bag 20 (first embodiment) and first bag 52 (second embodiment) are provided, and a second bag 22 (second embodiment) and a second bag 54 (second embodiment) are provided on the left side. May be.

Further, in the third embodiment, the first bag is provided on the left side portion of the seat back 14 in the seat width direction, but the present invention is not limited to this, and the first bag may be provided on the right side portion.

As described above, in the first to third embodiments, the case where the vehicle collides in front with the seat front-rear direction and the vehicle front-rear direction of the vehicle seat 12 coincide with each other has been described as an example, but the present invention is not limited to this. It is also effective when the vehicle collides with the rear surface in a state where the front-rear direction of the vehicle seat 12 and the front-rear direction of the vehicle are opposite to each other, that is, when the occupant is seated on the vehicle seat 12 and faces the rear of the vehicle.

10 Airbag device with vehicle seat 12 Vehicle seat 14 Seat back 20 First bag (multiple airbags)
22 Second bag (multiple airbags)
44 Friction surface 50 Airbag device with vehicle seat 52 First bag (multiple airbags)
54 Second bag (multiple airbags)
60 Airbag device with vehicle seat 62 1st bag (multiple airbags)
66 Second bag (multiple airbags)
68 Third bag (multiple airbags)
P occupant (seated occupant)

Claims (1)

It is provided on both sides of the seat back of the vehicle seat in the seat width direction, and by expanding and expanding, it overlaps so as to cover at least the front surfaces of both left and right shoulders of the seated occupant, and the left and right shoulder portions of the seated occupant are overlapped with the seat back. With multiple airbags surrounding
A friction surface provided on the surface of a portion where the plurality of airbags overlap and having a higher coefficient of friction than the other portions of the airbag.
Have,
The plurality of airbags include a first bag, a second bag, and a third bag.
The first bag is provided on one side of the seat back in the seat width direction, and expands and expands so as to cover the front surfaces of the left and right shoulders of the seated occupant from the one side to the other side. It is extended in a rod shape across the
The second bag and the third bag are provided on one side portion and the other side portion of the seat back , respectively, and expand and expand so as to wrap both ends in the extending direction of the first bag. Engage with both ends,
Airbag device with vehicle seat.