JP2019171985A - Occupant protection device for vehicle - Google Patents

Abstract

A vehicle occupant protection device is provided which is capable of seating a vehicle seat in a comfortable position and appropriately restraining an occupant who intends to inertia move toward the rear of the seat at the time of a vehicle collision. An airbag device has an airbag and an inflator. The inflator 50 is activated when an inertial movement of the occupant P seated on the vehicle seat 12 at the time of a vehicle collision toward the rear side of the seat is detected or predicted, and the vehicle seat 12 is set to the comfortable posture position. . The airbag 44 is housed in the seat back 16 and has a first chamber 46 and a second chamber 48. When the gas is supplied from the inflator 50, the first chamber 46 is inflated and deployed from the upper side of the seat to the front side of the seat from the shoulder S of the occupant P. The second chamber 48 is disposed below the first chamber 46 and is configured to expand and deploy between the back B of the occupant P and the seat back 16. [Selection diagram] Fig. 1

Description

  The present invention relates to a vehicle occupant protection device.

  An automobile occupant holding device described in Patent Document 1 described below is configured such that a back airbag is inflated and deployed between a back part of a passenger and a seat back at the time of a frontal collision (front collision) of a vehicle. . According to this configuration, the upper body of the occupant inertially moves to the front side of the seat due to the impact at the time of the front collision, and then the upper body of the occupant is supported by the back airbag when moving to the rear side of the seat by the reaction. The Thereby, the impact when the upper body hits the seat back is alleviated.

  On the other hand, the occupant protection device described in Patent Document 2 below is configured such that the airbag device is inflated and deployed between the lumbar portion of the occupant and the seat back during a frontal collision of the vehicle. According to this configuration, when the airbag device is inflated and deployed at the time of the front collision, the occupant's waist is pushed forward of the seat, and the inclination of the waist toward the seat rear side is reduced. As a result, the restraint performance by the lap belt is improved, and the submarine phenomenon in which the occupant sinks into the seat cushion and passes under the lap belt is avoided.

  On the other hand, the vehicle occupant protection device described in Patent Document 3 described below is configured such that the auxiliary airbag is inflated and deployed between the occupant's waist and the seat back during a frontal collision of the vehicle. Since this auxiliary airbag is inflated and deployed from the lower side to the upper side, the upper body of the occupant rises. As a result, the sitting posture of the occupant is corrected and the submarine phenomenon is avoided.

JP H11-342822 JP 2007-015466 A Japanese Patent Laid-Open No. 2006-055505

  By the way, with the development of automatic driving technology and driving support technology in recent years, it is assumed that the driver's seat passenger or the passenger in the front passenger seat changes the direction of the seat while driving or takes a comfortable posture with the seat back greatly inclined. Is done.

  The above prior art assumes a frontal collision of the vehicle when the seat is disposed forward, and an occupant who intends to move inertially forward of the seat by an impact can be restrained by an airbag. However, for example, it is not assumed that the seat is disposed rearward and the occupant attempts to move inertially toward the rear side of the seat (the front side of the vehicle) at the time of a frontal collision of the vehicle. For this reason, there is room for improvement in that an occupant attempting to move inertially toward the rear of the seat at the time of a vehicle collision is appropriately restrained by an airbag.

  In addition, an airbag that restrains an occupant trying to move inertially toward the rear of the seat is particularly important when the occupant is seated in a comfortable posture. This is because, in the state where the seat back is excessively tilted backward so that the occupant takes an easy posture, the occupant who intends to move the inertia to the rear side of the seat (the front side of the vehicle) at the time of the collision of the vehicle, The reaction force may not be obtained. For this reason, there is a concern that the occupant ascends obliquely upward along the seat back and a secondary collision occurs in the passenger compartment.

  In view of the above facts, the present invention provides a vehicle occupant protection device that can sit in a comfortable position on a vehicle seat at the time of a vehicle collision and can appropriately restrain an occupant attempting to move inertially toward the rear of the seat. With the goal.

  In the vehicle occupant protection device according to the first aspect of the present invention, the inertia movement of the occupant seated on the vehicle seat to the rear side of the seat is detected or predicted when the vehicle collides, and the seat back is located on the rear side of the seat. An inflator that generates gas when it is tilted beyond a predetermined angle, and is housed in the seat back, and gas is supplied from the inflator so that the seat is located above the passenger's shoulder. A first chamber that is inflated and deployed from the front of the seat to restrain the shoulder portion of the occupant, and a second chamber that is disposed below the first chamber and is inflated and deployed between the back portion of the occupant and the seat back. And an airbag configured to include a chamber.

  In the vehicle occupant protection device according to the first aspect of the present invention, the airbag is housed in the seat back, and the inertial movement of the occupant seated on the vehicle seat to the rear side of the seat is detected or detected when the vehicle collides. When it is predicted and the seat back is inclined beyond the predetermined angle toward the rear side of the seat, the inflator is activated and gas is supplied into the airbag. Here, the airbag is configured to include a first chamber and a second chamber, and the first chamber is inflated and deployed from the seat upper side to the seat front side from the shoulder portion of the occupant to restrain the occupant shoulder portion. . The second chamber is disposed below the first chamber and is inflated and deployed between the back of the occupant and the seat back.

  Here, in the state where the seat back is excessively inclined toward the rear side of the seat, the reaction force in the front direction that the occupant receives from the seat back via the second chamber is reduced. Then, there is a possibility that an occupant who intends to move inertially toward the rear side of the seat at the time of a vehicle collision slides up obliquely upward along the seat back. Even in such a case, the occupant's shoulder can be restrained from the upper side of the seat in the first chamber. As a result, the occupant is prevented from rising upward and the restraint performance of the occupant by the second chamber can be exhibited.

  As described above, according to the vehicle occupant protection device of the present invention as set forth in claim 1, the occupant who sits in a comfortable position on the vehicle seat at the time of a vehicle collision and tries to move inertially toward the rear of the seat. It has an excellent effect that can be restrained appropriately.

It is a side view in the case where a protection mode by a vehicle occupant protection device concerning this embodiment is shown typically, and a driver's seat is facing backward. FIG. 2 is an enlarged front view schematically showing a protection mode by the vehicle occupant protection device shown in FIG. 1 and viewed from the front side of the seat. It is a side view in the case where the protection mode by the vehicle occupant protection device as a comparative example is schematically shown and the driver's seat is facing backward.

  Hereinafter, based on FIGS. 1-3, the airbag apparatus 40 as a passenger | crew protection device for vehicles which concerns on this embodiment is demonstrated. In addition, the arrow FR, arrow UP, and arrow RH which are suitably described in each figure indicate the front direction, the upward direction, and the right direction of the vehicle 10, respectively. Hereinafter, when simply using the front-rear, up-down, left-right directions, unless otherwise specified, the front-rear direction of the vehicle, the up-down direction of the vehicle, the left-right direction of the vehicle width when facing the traveling direction are shown. Shall.

(Configuration of vehicle seat 12)
As shown in FIG. 1, the airbag device 40 is mounted on the vehicle seat 12.

  The vehicle seat 12 includes a seat cushion 14 that supports the occupant's waist L and thigh D, a seat back 16 that is tiltably supported by the rear end of the seat cushion 14 and supports the occupant's back B, and a seat. The headrest 18 is provided at the upper end portion of the back 16 so as to be movable up and down and supports the head H of the occupant. The vehicle seat 12 is configured as a driver's seat of the vehicle 10 and is provided at a position offset to the left or right side with respect to the vehicle width direction center portion of the vehicle 10.

  Further, the seat back 16 of the vehicle seat 12 described above is a metal seat back frame (not shown) that is a skeleton member, and a seat back pad (not shown) configured as a cushion material that covers the seat back frame. And a seat skin 19 covering the seat back pad. The seat back frame includes a side frame disposed on both sides of the seat back 16 in the seat width direction, an upper frame that connects the upper ends of the side frames in the seat width direction, and the lower ends of the side frames in the seat width direction. And a lower frame connected to (both are not shown).

  Although not shown, the front portion of the seat back 16 in the front-rear direction of the seat has a tearing portion (not shown) that breaks and breaks when a pressing force is applied when an airbag 44 described below is inflated and deployed. It is formed along the direction. In addition, what is necessary is just to set a cleavage part suitably with the fixing position of the airbag module 42 mentioned later.

  Supplementally, each figure shows a state where a crash test dummy (doll) is seated on the seat cushion 14 of the vehicle seat 12 as a model of an occupant to be protected. This dummy is AM95 (95th percentile of an American adult male), a full lap frontal crash test dummy. Hereinafter, the dummy is regarded as an occupant and referred to as “occupant P”.

  Here, the vehicle seat 12 of the present embodiment is a rotary seat. As an example, the seat cushion 14 of the vehicle seat 12 is attached to the floor so as to be able to rotate about the vehicle up-down direction, and the occupant P faces forward and the occupant P faces rearward. It can be rotated between positions.

  1 shows a side view of the vehicle seat 12 as viewed from the right side in the vehicle width direction of the vehicle 10 in which the seat 12 is disposed in a rearward position where the seated passenger P faces the rear of the vehicle. Has been. In FIG. 1, a vertical line with respect to the floor of the vehicle 10 is indicated by a straight line Q1, and a center line along the inclination direction of the seat back 16 is indicated by a straight line Q2. Further, FIG. 1 shows a state in which the seat back 16 is inclined to a position where the inclination angle θ of the straight line Q2 to the rear of the straight line Q1 is θ1. In the present embodiment, the state where the inclination angle θ of the straight line Q2 in the seat back 16 with respect to the straight line Q1 toward the rear of the seat exceeds θ1 is defined as the comfort posture position of the vehicle seat 12. In the vehicle seat 12 in this state, the seated occupant P's waist L is supported almost without being refracted, and the seated posture of the occupant P is an easy posture. Further, as compared with the case where the vehicle seat 12 is disposed in the forward-facing position, the distance from the seatback 16 to the steering wheel 24 of the driver's seat and the windshield glass 26 and the front header 28 disposed in the front of the vehicle is reduced. It is in a state.

  A three-point seat belt device 20 is mounted on the vehicle seat 12. The seat belt device 20 includes a webbing 22 configured as a non-stretchable belt-like member for restraining an occupant P seated on the vehicle seat 12. One end of the webbing 22 is locked to a webbing take-up device (not shown), and is configured to be wound in layers on the take-up shaft of the webbing take-up device by an urging force. Further, the other end of the webbing 22 is locked to an anchor plate (not shown). The intermediate portion of the webbing 22 is supported and folded back through a shoulder anchor (not shown). Further, a tongue plate (not shown) that is movably inserted and supported is disposed in an intermediate portion of the webbing 22. Then, the occupant P engages with a buckle device (not shown) erected on the inner side in the seat width direction of the seat cushion 14 of the vehicle seat 12 so that the occupant P has a three-point seat belt device 20. The webbing is in a state of wearing.

  When the seat belt device 20 is mounted with the webbing, the webbing 22 from the tongue plate to the shoulder anchor functions as a shoulder webbing 22A that restrains the shoulder S on the outer side in the seat width direction of the occupant P, and the webbing 22 from the tongue plate to the anchor plate. Functions as a lap webbing 22B for restraining the waist L of the occupant P.

  The webbing retractor is disposed inside the seat back 16 of the vehicle seat 12, and the anchor plate is fixed to the outer side of the seat cushion 14 in the seat width direction. A shoulder anchor (belt guide) is disposed at the upper end of the seat back 16 and at the outer side in the seat width direction. Thereby, even when the webbing is mounted on the seat belt device 20, the vehicle seat 12 can be rotated about the floor in the vehicle vertical direction. In this embodiment, as an example, a webbing take-up device having a force limiter mechanism is used.

(Configuration of airbag device 40)
As shown in FIG. 1, the airbag device 40 includes an airbag 44 formed in a bag shape, and an inflator 50 that supplies gas to the airbag 44 by operating. The airbag 44 is normally an airbag module 42 together with the inflator 50, and is accommodated inside the seat back 16 of the vehicle seat and on the seat rear side of the tearing portion formed in the seat back 16. In the airbag module 42, the airbag 44 is folded by a predetermined folding method such as bellows folding or roll folding, and is wrapped with a wrap material (not shown) that can be easily broken.

  The inflator 50 is a so-called cylinder type inflator and is formed in a cylindrical shape. As an example, the inflator 50 is fixed to a bracket (not shown) spanned between the side frames of the seat back 16, and the rear of the airbag 44 is positioned in a posture in which the axial direction is along the seat width direction of the seat back 16. Housed at the end. Specifically, a stud bolt (not shown) projects from the outer peripheral portion of the inflator 50 toward the rear side in the front-rear direction of the seat. In the stud bolt, a nut (not shown) is screwed onto the distal end side while passing through the base fabric of the airbag 44 and a bracket spanned between the side frames. Thereby, the airbag 44 and the inflator 50 are fastened and fixed to the side frame via the bracket.

  A gas jet (not shown) is formed at one end of the inflator 50 in the axial direction. When the inflator 50 is actuated (started up), a gas for expansion and deployment is jetted from the gas jet. The gas is supplied to the inside of the airbag 44.

  As shown in FIG. 1, an ECU (Electronic Control Unit) 52 is electrically connected to the inflator 50. The ECU 52 is electrically connected to a collision detection sensor 54 that predicts or detects a frontal collision or a rearward collision of the vehicle 10. The ECU 52 is electrically connected to a seat orientation sensor 56 that detects the orientation of the vehicle seat 12 and a seat back sensor 58 that detects whether or not the vehicle seat 12 is set at the comfort position described above. ing. The signals sent from these sensors detect or predict the inertial movement of the occupant P seated on the vehicle seat 12 toward the rear of the seat in the event of a vehicle collision, and the vehicle seat 12 is set to the comfort posture position. When the ECU 52 detects that the inflator 50 has been detected, the inflator 50 is activated.

  Here, the case where the occupant P seated on the vehicle seat 12 is inertially moved toward the rear of the seat at the time of the vehicle collision is a case where the vehicle 10 collides with the front in a state where the vehicle seat 12 is disposed at the rearward position. This is a case where the vehicle 10 collides rearward with the vehicle seat 12 placed in a forward-facing position.

  Accordingly, a frontal collision of the vehicle is detected or predicted by the collision detection sensor 54, the vehicle seat 12 is detected by the seat orientation sensor 56, and the vehicle seat 12 is detected by the seatback sensor 58. The inflator 50 is operated on the condition that it is detected that is set to the comfort posture position.

  Alternatively, the rear collision of the vehicle is detected or predicted by the collision detection sensor 54, the vehicle seat 12 is detected by the seat direction sensor 56, and the vehicle seat 12 is detected by the seat back sensor 58. The inflator 50 is configured to operate on the condition that it is detected that is set at the comfort posture position.

  Here, as shown in FIG. 1, the airbag 44 includes a first chamber 46 and a second chamber 48 that are inflated when gas is supplied from the inflator 50. It is considered as a bag.

  The first chamber 46 is formed in a bag shape by, for example, superimposing and sewing two base fabrics formed of a nylon or polyester fabric material. A gas outlet of the inflator 50 is inserted into the first chamber 46, and the upper end of the seat back 16 in the vertical direction of the seat back 16 and the shoulder webbing 22 </ b> A are not arranged by the pressure of the gas generated from the inflator 50. Inflate and deploy from one end to the front side of the seat. In other words, the shoulder webbing 22A is inflated and deployed from the seat upper side of the shoulder portion S of the occupant P to the front side of the seat. In addition, the first chamber 46 is formed as a long bag body that is curved so as to form a substantially U shape having an opening on the lower side of the sheet in a side view along the sheet width direction in an inflated and deployed state. . For this reason, it arrange | positions so that the passenger | crew's shoulder part S which the shoulder webbing 22A may not cover may be covered from a seat upper side.

  Similar to the first chamber 46, the second chamber 48 is formed in a bag shape by overlapping and sewing two base fabrics made of nylon or polyester fabric. The second chamber 48 is sewn with the lower end of the first chamber 46 overlapped with the upper end portion and the inner end portion in the seat width direction, and the seat back 16 in the front-rear direction of the seat back 16 by the pressure of the gas generated from the inflator 50. The seat expands and expands from the front side of the seat to the front of the seat, the left and right in the seat width direction, and the top and bottom in the seat vertical direction. The second chamber 48 is disposed below the first chamber 46 in an inflated and deployed state, and is formed in a substantially rectangular shape that is elongated along the seat vertical direction when viewed from the front of the seat. For this reason, it is disposed between the back B and waist L of the occupant P and the seat back 16.

  Further, as shown in FIG. 2, the first chamber 46 and the second chamber 48 are partitioned by a partition portion 48A. In the present embodiment, the partition portion 48A is configured by the upper end portion of the bag-like second chamber 48 and the end portion on the inner side in the sheet width direction. That is, the upper end portion of the second chamber 48 and the inner end portion in the sheet width direction function as the partition portion 48A.

  As shown in FIG. 2, the partition portion 48A is formed with one communication hole 48B, and the internal space of the first chamber 46 and the internal space of the second chamber 48 are communicated with each other through the communication hole 48B. Yes. Thereby, when the inflator 50 is operated and gas is generated, first, gas is supplied into the first chamber 46, and the first chamber expands and develops. Next, the gas in the first chamber 46 is supplied to the second chamber 48 through the communication hole 48B, and the second chamber 48 is inflated and deployed. Note that a plurality of communication holes 48B may be provided in the partition 48A. The number of the communication holes 48 </ b> B may be appropriately changed according to the size of the airbag 44 and the amount of gas supplied from the inflator 50.

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

  In the airbag device 40 having the above-described configuration, the airbag 44 is accommodated in the seat back 16, and the inertial movement of the occupant P seated on the vehicle seat 12 to the rear side of the seat is detected or predicted when the vehicle collides, and The inflator 50 is operated on the condition that the vehicle seat 12 is set at the comfortable posture position.

  The case where the occupant P seated on the vehicle seat 12 is inertially moved to the rear side of the seat at the time of the vehicle collision is a case where the vehicle 10 collides with the front in a state where the vehicle seat 12 is disposed at the rearward position, This is a case where the vehicle 10 collides rearward with the vehicle seat 12 placed in a forward-facing position. In addition, when the vehicle seat 12 is set to the comfort posture position, as shown in FIG. 1, the inclination angle θ of the seat back 16 with respect to the straight line Q2 of the straight line Q2 to the rear of the seat exceeds θ1. Is detected.

  That is, as shown in FIG. 1, the inflator 50 is activated when the vehicle seat 12 is set in the comfort posture position and the vehicle seat 12 is disposed in the rearward position at the time of a frontal collision of the vehicle. To do.

  Alternatively, although not shown, the inflator 50 is activated when the vehicle seat 12 is set at the comfort posture position and the vehicle seat 12 is disposed at the forward-facing position at the time of a rear collision of the vehicle.

  When the inflator 50 operates in this way, gas is supplied into the airbag 44. Specifically, first, gas is supplied into the first chamber 46. The first chamber 46 is inflated and deployed from the upper side of the seat to the front side of the seat from the shoulder S of the occupant P on the side where the shoulder webbing 22A is not applied, and restrains the shoulder S of the occupant P. The second chamber 48 is inflated and deployed between the back B of the occupant P and the seat back 16.

  By the way, when the vehicle seat 12 is set in the comfort posture position, the greater the inclination of the seat back 16 toward the rear of the seat, the more the passenger P receives from the seat back 16 via the second chamber 48 in the forward direction of the seat. Reaction force decreases. Then, there is a possibility that the occupant P who intends to move inertially toward the rear side of the seat due to the impact of the collision will rise obliquely upward along the seat back 16. Even in such a case, the shoulder S of the occupant P can be restrained from the upper side of the seat by the first chamber 46. Thereby, the occupant P is restrained from inertial movement to the upper side of the seat, and the restraining performance of the occupant P by the second chamber 48 can be exhibited.

  Furthermore, in order to supplementarily explain the above-described effects, a case where the vehicle 70 shown in FIG. FIG. 3 shows a state in which the vehicle seat 76 is disposed at the rearward position and the vehicle seat 76 is set at the comfort posture position. In this vehicle seat 76, the inertial movement of the occupant P seated on the vehicle seat 76 to the rear side of the seat is detected or predicted in the event of a vehicle collision, and the vehicle seat 76 is set to the comfort posture position. The airbag 80 is inflated and deployed between the seat back 78 and the back B of the occupant P.

  According to the above configuration, when the vehicle 70 collides with the front, the occupant P tends to inertially move rearward due to the impact of the collision. At this time, when the airbag 80 is inflated and deployed between the seat back 78 and the back B of the occupant P at the time of a frontal collision, the airbag 80 receives a load F (see FIG. 3) from the occupant P in the rearward direction of the seat. Entered. When this load F is divided into a component F1 perpendicular to the inclination direction of the seat back 78 and a component F2 upward of the seat along the inclination direction of the seat back 78, the back B of the occupant P becomes a component. A reaction force R1 against F1 can be received from the seat back 78 via the airbag 80 (see arrows F1, F2, and R1 shown in FIG. 3). On the other hand, in the airbag 80, since the reaction force surface for generating the reaction force against the component F2 is scarce, the occupant P is seated as indicated by a two-dot chain line in FIG. 3 from the seating position immediately after the collision indicated by the solid line in FIG. It can be considered that the seat slides up to the position along the seat back 78. Therefore, the head H of the occupant P may collide with the windshield glass 72 or the front header 74 in a secondary collision.

  On the other hand, in the airbag device 40 of the present embodiment, the first chamber 46 of the airbag 44 is inflated and deployed from the upper side of the seat to the front side of the seat from the shoulder portion S of the occupant P, and the shoulder portion S of the occupant P is to bound. For this reason, the first chamber 46 becomes a reaction force surface, and the shoulder S of the occupant P can receive the reaction force R2 against the component F2 of the load F. As a result, the occupant P is restrained from rising obliquely upward along the seat back 16, and the restraint performance by the airbag 44 can be exhibited.

  In the present embodiment, the inflator 50 is connected to the first chamber 46, and gas is first supplied from the inflator 50 to the first chamber 46. Accordingly, the first chamber 46 is inflated and deployed at an early stage, and the shoulder portion S of the occupant P can be restrained in the initial stage. As a result, the inertial movement of the occupant P toward the upper side of the seat can be suppressed early in the collision, and the restraining force of the back B of the occupant P by the second chamber 48 is improved.

  The airbag device 40 of the present embodiment has been described above, but the configuration of the present invention is not limited to this. For example, in the present embodiment, the first chamber 46 and the second chamber 48 are partitioned by the partition portion 48A, but a structure without the partition portion 48A may be used. Moreover, you may partition using separate members, such as a tether.

  In the present embodiment, the inflator 50 is connected to the first chamber 46. First, gas is supplied from the inflator 50 to the first chamber 46, and the second chamber 48 passes through the communication hole 48B from the first chamber 46. However, the present invention is not limited to this. For example, the inflator 50 is configured by a dual inflator having a plurality of gas generation units, and gas is supplied to the first chamber 46 and the second chamber 48 by a plurality of gas jets formed in the inflator 50, respectively. Also good. Alternatively, separate inflators may be connected to the first chamber 46 and the second chamber 48, respectively, so that gas is supplied separately.

  In the present embodiment, the first chamber 46 is firstly expanded and deployed, and then the second chamber 48 is expanded and deployed. However, the present invention is not limited to this, and the first chamber 46 and the second chamber are not limited thereto. It is good also as a structure which complete | finishes 48 expansion | deployment deployment simultaneously. Alternatively, the second chamber 48 may be inflated and deployed, and then the first chamber 46 may be inflated and deployed. In this case, the inflator 50 may be connected to the second chamber 48.

  In the present embodiment, the vehicle seat 12 can be arranged in two ways, that is, a forward position and a rearward position. However, the present invention is not limited to this. For example, it is good also as a structure which can be arrange | positioned in the position of the horizontal direction in which a seat direction corresponds to a vehicle width direction. In this case, the collision of the vehicle in which the occupant seated on the vehicle seat is inertially moved to the rear side of the seat is a case where the vehicle left side of the vehicle 10 collides sideways with the seat facing rightward in the vehicle width direction. This is a case where the vehicle right side surface of the vehicle 10 has a side collision with the seat facing leftward in the vehicle width direction.

  Further, in the present embodiment, the vehicle seat 12 is configured as a driver seat of the vehicle 10, but is not limited thereto, and may be configured as a passenger seat or a rear seat.

  Further, in the airbag device 40 according to the present embodiment, even when the vehicle seat 12 is not set to the comfort posture position (when the seat back 16 is not excessively inclined toward the rear side of the seat), the seat at the time of the vehicle collision An occupant attempting to move inertially toward the rear side can be appropriately restrained by the airbag 44. Therefore, it is possible to grasp this point as a problem to be solved by the present invention. In this case, the configuration of the invention is “detecting a collision of a vehicle in which an occupant seated in a vehicle seat is inertially moved to the rear side of the seat. Alternatively, an inflator that operates by being predicted and generates gas, and is housed in the seat back, and is supplied with gas from the inflator, so that it is inflated and deployed from the seat upper portion of the occupant to the front of the seat. And a first chamber that restrains the shoulder portion of the occupant, and a second chamber that is disposed below the first chamber and that is inflated and deployed between the back portion of the occupant and a seat back. It can be understood as an occupant protection device.

DESCRIPTION OF SYMBOLS 10 Vehicle 12 Vehicle seat 16 Seat back 40 Airbag device (vehicle occupant protection device)
44 airbag 46 first chamber 48 second chamber 50 inflator P occupant S shoulder B back

Claims (1)

It is activated when the inertia movement of the occupant seated in the vehicle seat to the rear side of the seat is detected or predicted and the seat back is tilted beyond the predetermined angle at the time of the vehicle collision. An inflator that generates
A first chamber which is housed in the seat back and is inflated and deployed from the seat upper side to the seat front side from the shoulder portion of the occupant by supplying gas from the inflator and restrains the occupant shoulder portion; An airbag that is disposed on the lower side of the first chamber and includes a second chamber that is inflated and deployed between the back of the occupant and a seat back;
An occupant protection device for vehicles.