JP2010155575A - Occupant crash protection device and vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an airbag device for a vehicle capable of quickly and surely deploying an airbag in a protective area on a rear side of a seat back. <P>SOLUTION: A gas injection port 58 of an inflator 28 is arranged at the vehicle widthwise outside of a seat back 26. Gas is supplied to the inside of an airbag bag body 30 from a side of a narrower gap between a headrest 40 and back window glass 20 and the gas flows toward the vehicle widthwise inside having a wider gap between the headrest 40 and the back window glass 20, and thereby also the airbag bag body 30 is inflated from the side of the narrower gap to the side of the wider gap between the headrest 40 and the back window glass 20. As compared with a case where the gap is constant or a case where the airbag bag body 30 is inflated from the side of the wider gap to the side of the narrower gap, the airbag bag body 30 is constituted to be easily inflated. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an occupant protection device for a vehicle and a vehicle, and more particularly to an occupant protection device and a vehicle that can protect an occupant's head during a rear-end collision.

2. Description of the Related Art In recent years, an airbag device as an occupant protection device has been installed at the rear of a vehicle interior for the purpose of protecting an occupant during a rear-end collision.
This airbag device installed at the rear of the vehicle interior is configured to include an inflator and an airbag bag body, as with other airbag devices installed on a steering wheel, a dashboard, and the like. In the vehicle described in 1), the airbag bag body is stored in a storage space inside the rear end portion of the roof of the vehicle and above the rear window glass in a folded state. When an impact is applied to the vehicle from the rear, the inflator is activated and gas is ejected into the airbag bag body, and the airbag bag body is located on the vehicle front side of the rear window glass located obliquely rearward and downward from the storage space. It expands and expands toward the front, mainly protecting the passenger's head from the impact.

  However, in a vehicle with a sufficient head clearance from the head of the occupant to the ceiling, such as a high roof vehicle, and a distance from the ceiling to the protection area behind the head of the occupant is longer than a vehicle in which the protection area is close to the ceiling, The time until the airbag bag body reaches the protection area becomes longer.

Moreover, in the example of the vehicle shown in FIG. 4 of Patent Document 2, the airbag bag body stored in the seat back of the rearmost seat is deployed along the back window on the rear side of the rearmost seat, so that the passenger There is an advantage that the distance from the airbag storage portion to the protection area is short, and the time until the airbag bag body reaches the protection area can be shortened.
Japanese Patent Laid-Open No. 2006-103660. JP-A-11-198699.

When the airbag bag is stored in the seat back, an inflator that supplies gas for inflation and deployment to the airbag bag needs to be provided in the seat back together with the airbag bag.
In the rear seat, an inflator is placed in the center of the seat back in the width direction, and the air bag is inflated and deployed by injecting gas into the air bag body from the jet section provided in the center of the seat back in the width direction. When it is set as the structure to be made, there exists room for improvement in the point which deploys an airbag bag body smoothly to the back side of a headrest depending on a vehicle structure. For example, the smaller the space between the headrest and the vehicle interior rear wall, the more difficult the airbag bag body to be smoothly deployed.

  In consideration of the above-described facts, an object of the present invention is to provide an occupant protection device and a vehicle that can smoothly deploy an airbag bag body toward the upper rear side of a seat back.

  The occupant protection device according to claim 1 is stored in a seat back of a seat provided with a headrest, and is provided on the seat back, an airbag bag body that is deployable toward a seat back rear side, and the airbag. Gas jetting means having a jetting part for jetting a gas for deploying the bag body, and when the headrest and the rear wall surface of the passenger compartment are viewed in plan view, the jetting part is provided at the rear of the headrest and the passenger compartment. It is arranged on the side where the gap dimension between the headrest and the rear wall surface of the passenger compartment is smaller than the side where the gap dimension with the wall surface is larger.

Next, the operation of the occupant protection device according to claim 1 will be described.
The air bag body stored in the seat back of the seat is inflated by the gas ejected into the bag body when gas is ejected from the ejection portion of the gas ejecting means at the time of rear collision or at the time of prediction of rear collision. The seat back is developed upward on the back side of the seat back and is arranged on the back side of the headrest.

  Here, the ejection portion of the gas ejection means for ejecting gas into the airbag bag body has a larger gap dimension between the headrest and the vehicle interior rear wall when the headrest and the vehicle interior rear wall are viewed in plan ( Since the gap between the headrest and the rear wall of the passenger compartment is smaller than the side where the gap is wider (the side where the gap is narrower), the airbag bag body has a gap between the headrest and the rear wall of the passenger compartment. Expansion starts from the small side, and expands and expands to the side where the gap between the headrest and the rear wall of the passenger compartment is large.

For this reason, compared with the case where the expansion starts from the side where the gap between the headrest and the rear wall of the passenger compartment is large and the expansion progresses to the side where the gap between the headrest and the rear wall of the passenger compartment is small, the expansion is smoother. The airbag bag body being deployed can be prevented from being caught between the headrest and the vehicle interior rear wall.
The vehicle interior rear wall corresponds to, for example, the indoor side wall surface of the back door, the back door glass of the back door, and the like.

  According to a second aspect of the present invention, in the occupant protection device according to the first aspect, the gas ejection means is formed in an elongated shape along the longitudinal direction of the seat back, and the widthwise end of the seat back Arranged on the side.

Next, the operation of the occupant protection device according to claim 2 will be described.
The upper body of the occupant in contact with the seat back, that is, the torso, has a substantially elliptical shape in which the dimension in the vehicle width direction is longer than the dimension in the vehicle front-rear direction when viewed in a horizontal section.

  For this reason, considering the dimensions from the gas jetting means provided on the seat back to the back of the occupant, the dimension on the end side in the seat back width direction is longer than the center side of the seat back, and the gas provided inside the seat back The presence of the ejection means, that is, the uncomfortable feeling of the gas ejection means felt by the occupant on the back can be reduced.

  According to a third aspect of the present invention, in the occupant protection device according to the first or second aspect of the invention, the rear wall surface of the passenger compartment has a center portion in the vehicle width direction that protrudes toward the rear of the vehicle from both ends in the vehicle width direction. 2 or more of the seats are arranged in the vehicle width direction, and the ejection part is arranged outside the seat back in the vehicle width direction.

Next, the operation of the occupant protection device according to claim 3 will be described.
In a vehicle having a vehicle interior rear wall surface in which the vehicle width direction center part is convex toward the vehicle rear side from both ends of the vehicle width direction, when two or more seats are arranged in the vehicle width direction The distance between the headrest and the rear wall of the passenger compartment varies depending on the position of the headrest in the width direction. That is, the gap dimension between the vehicle width direction outer side portion of the headrest and the vehicle interior rear wall surface is smaller than the gap size between the headrest vehicle width direction inner portion and the vehicle interior rear wall surface.

  Therefore, when the vehicle width direction center part is a curved shape that protrudes toward the rear of the vehicle from both ends of the vehicle width direction, and at least two seats are arranged in the vehicle width direction, By arrange | positioning on the vehicle width direction outer side, an ejection part will be arrange | positioned at the side where the clearance gap dimension of a headrest and a vehicle interior rear wall surface is smaller than the side where the clearance gap dimension between a headrest and a vehicle interior rear wall surface is large.

  A vehicle according to a fourth aspect includes the occupant protection device according to any one of the first to third aspects.

  Since the vehicle according to claim 4 includes the occupant protection device according to any one of claims 1 to 3, the airbag bag body being deployed between the headrest and the rear wall surface of the passenger compartment. Can be suppressed.

  As described above, since the occupant protection device and the vehicle of the present invention have the above-described configuration, the airbag bag body can be smoothly deployed toward the upper rear side of the seat back.

[First Embodiment]
Hereinafter, an occupant protection device 10 according to a first embodiment of the present invention applied to a vehicle 8 will be described with reference to FIGS. In the figure, the arrow FR direction indicates the front of the vehicle, the arrow RE direction indicates the rear of the vehicle, the arrow OUT direction indicates the vehicle width direction outside direction, the arrow IN direction indicates the vehicle direction inside direction, and the arrow UP direction indicates the vehicle top direction.

(Configuration of roof and back door)

  In FIG. 1, reference numeral 12 denotes a roof header as a skeleton member that constitutes a passenger compartment ceiling portion, for example, provided at the rear edge of the vehicle along the vehicle width direction, and reference numeral 14 is joined to the roof header 12. Reference numeral 16 denotes a roof head lining as an interior material that covers the roof header 12 and the roof panel 14.

  A back door 18 is provided at the rear of the vehicle 8 so as to be openable and closable. A back window glass 20 is attached to the back door 18 using a seal member (not shown).

(Configuration of passenger protection device 10)
The occupant protection device 10 of the present embodiment is an airbag device that is provided on the seat back 26 of the rearmost seat 24 mainly in consideration of a rear collision (hereinafter referred to as a rear collision) of the vehicle. A bag bag body 30 is provided.

As shown in FIGS. 1 to 3, the seat back 26 of the rearmost seat 24 includes a seat back frame 32 that forms a skeleton of the seat back 26.
The seat back frame 32 includes a seat back upper frame 34 and a pair of seat back side frames 36. Each pair of the seat back side frames 36 extends in the seat height direction, and the seat back 26 The left and right side portions are configured.

  The seat back upper frame 34 is provided on the upper side of the seat back side frame 36. The seat back upper frame 34 includes an upper frame portion 34A that extends in the seat width direction and forms an upper portion of the seat back 26, and an upper frame portion 34A. A side frame shoulder portion 34B connected to both sides in the seat width direction of the frame portion 34A and curved downward in the seat height direction, and a seat height connected to the lower side in the seat height direction of the side frame shoulder portion 34B. And a side frame upper portion 34C extending in the direction.

  The upper frame portion 34A is provided with a pair of pole guides 38, and a pair of poles 42 provided on the headrest 40 are slidably inserted into the pole guides 38.

A back panel 44 is provided on the vehicle rear side (back side) of the seat back frame 32, and a back board 46 is provided on the vehicle rear side of the back panel 44.
The back panel 44 is formed with a first recess 48 extending along the seat width direction and a second recess 50 extending along the seat height direction (vertical direction) on the vehicle rear side.

The first recess 48 is formed on the lower side of the upper frame portion 34A. On the other hand, the second recess 50 is formed downward from the lower portion of the first recess 48 at a position deviated from the center line SL in the seat width direction toward the outside in the vehicle width direction.
The first concave portion 48 is an airbag storage portion that stores an airbag bag body 30 described later, and the second concave portion 50 is an inflator storage portion that stores an inflator 28 described later.

(Inflator and airbag bag body)
A substantially cylindrical inflator 28 is disposed in the second recess 50. The inflator 28 is vertically held inside the second recess 50 by a holding plate 56 fixed to the back panel 44 with bolts 52 and nuts 54.

  The inflator 28 is a gas generating means for generating gas at the time of rear collision or prediction of the rear collision of the vehicle. The inflator 28 is operated by an operating current from an airbag ECU (not shown), and an airbag bag is formed from a gas outlet 58 formed in the upper portion. An expansion gas is supplied to the inside of the body 30.

As shown in FIGS. 1 and 2, in the airbag bag body 30 of the present embodiment, a cylindrical connecting portion 30 </ b> A as a gas introducing portion is connected to the gas outlet 58 side of the inflator 28, and the upper side of the inflator 28 is The main body portion 30B is rolled and folded to the vehicle rear side with the upper edge portion at the time of unfolding as the axis (when viewed from the left side of the vehicle, the main body portion 30B rotates to the right with the upper end as the axis. And is stored in the first recess 48. That is, a portion (main body portion 30B) wound and folded in a roll shape of the airbag bag body 30 is directed to the vehicle rear side, and the main body portion 30B wound in a roll shape and folded is the inflator 28. It expands and expands while being unwound by receiving the supply of gas.
In addition, although it is preferable that the axial center of the main-body part 30B wound and folded by roll shape is horizontal, you may incline a little.

  As shown in FIG. 4, in the vehicle of the present embodiment, the rear seats 24 are provided on both sides of the vehicle width direction center line BL. Since the back window glass 20 is curved in a substantially arc shape with the point on the vehicle width direction center line BL as the center of curvature, the distance between the headrest 40 of the rear seat 24 and the back window glass 20 is The outer side in the width direction is narrower than the inner side in the vehicle width direction (interval t1 in the vehicle width direction outer side> interval t2 in the vehicle width direction).

  When the gas is ejected from the gas ejection port 58 of the inflator 28, the gas spreads radially inside the airbag bag body around the gas ejection port 58, and the airbag bag body 30 receives the pressure of the ejected gas, The expansion starts from the vicinity of the outlet 58, that is, from the connecting portion 30 </ b> A side, and the roll state of the main body portion 30 </ b> B is sequentially released as the expansion progresses.

  As shown by the solid line in FIG. 4 (A), the airbag bag body 30 has the body portion 30B on both sides in the width direction of the headrest 40 and the headrest 40 between the headrest 40 and the back window glass 20 in the deployed state. It is arranged on the upper side and is formed so as to cover substantially the entire back window glass 20 above the seat back 26.

  As shown in FIGS. 1, 5, and 6, the backboard 46 of the present embodiment is formed of, for example, a resin plate, a particle board, or the like, and is an upper board positioned above the middle portion in the seatback height direction. 46A and a lower board 46B positioned below the 46A.

As shown in FIG. 6, the upper board 46A and the lower board 46B are both covered by a single sheet material 49 having flexibility, and the upper board 46A and the lower board 46B are flexible sheets. They are connected by a material 49.
Note that the sheet material 49 of the present embodiment may be a sheet material having flexibility, such as a skin material such as leather or leather used for a seat, carpet, woven fabric, or resin film.

  Here, the lower board 46B is fixed to the back panel 44 with a clip, a screw or the like (not shown).

  On the other hand, the upper board 46A is detachably locked (that is, temporarily fixed) to the back panel 44 with a clip or the like (not shown) as shown in FIG. When the upper board 46A is pressed from the inside by the airbag bag body 30, the clip is detached from the back panel 44, the upper board 46A is detached from the back panel 44, and the airbag bag body 30 stored in the first recess 48 is removed. It is configured to be exposed.

  The sheet material 49 connecting the lower board 46B and the upper board 46A between the lower board 46B and the upper board 46A serves as a so-called hinge 51, and the upper board 46A is used as the back panel 44 as shown in FIG. The upper board 46A can swing on the upper side of the hinge 51 around the hinge 51.

As shown in FIG. 1, the first recess 48 storing the airbag body 30 wound and folded in a roll shape is formed at an intermediate portion between the upper frame portion 34 </ b> A and the hinge 51. For this reason, when the upper board 46A is detached from the back board 46 and tilted rearward of the vehicle, the airbag body 30 stored in the first recess 48 is exposed rearward and obliquely upward.
In the present embodiment, the gas outlet 58 of the inflator 28 is disposed in the vicinity of the hinge 51.

As shown in FIG. 1, in the normal state (when the airbag is not in operation), the entire back surface of the back panel 44 is covered with the upper board 46A and the lower board 46B.
As shown in FIG. 5, a pair of strap fixing brackets 59 are arranged on the upper portion of the back panel 44 at intervals in the sheet width direction and fixed with screws or the like. Then, one end of the strap 55 is locked to one strap fixing bracket 59 and the other end of the strap 55 is locked to the other strap fixing bracket 59 so that the belt-like strap 55 forms a loop.

  The strap 55 attached to the back panel 44 in this manner serves to limit the swing (opening) angle of the upper board 46A. The upper board 46A removed from the back panel 44 has the strap 55 illustrated in FIG. As shown in FIG. 5, the vehicle can be tilted rearward about the hinge 51 until it is tensioned. Note that the maximum swing (opening) angle of the upper board 46A with respect to the back panel 44 is limited to θ1 by the strap 55.

As shown in FIG. 6, when the seat back 26 is viewed in a vertical cross section, the airbag bag body 30 is easily inflated from between the back panel 44 and the upper board 46 </ b> A that is tilted to the maximum with the back panel 44. In addition, a minimum interval T between the back panel 44 and the upper board 46A that is inclined to the maximum extent from the back panel 44 is set so as to be unwound.
When the upper board 46A is fixed to the back panel 44, the strap 55 is disposed in a slack state between the upper board 46A and the back panel 44.

  As shown in FIG. 3, in the seat back 26, a seat cushion 60 is provided on the vehicle front side of the back panel 44. The surface shape of the front side of the seat cushion 60 as seen in the horizontal section is a shape in which the center side in the width direction is recessed in accordance with the shape of the back of the occupant 62.

(Function)
When the airbag ECU determines a rear collision or predicts a rear collision, an electric current is passed from the airbag ECU to the inflator 28 to activate the inflator 28.
When the inflator 28 is actuated, a large amount of gas is instantaneously supplied to the airbag bag body 30 that is folded and stored in a roll shape, and the airbag bag body 30 starts to inflate and deploy.

  A clip temporarily holding the upper board 46A when an expansion pressure (a pressure at which the clip temporarily holding the upper board 46A is released from the back panel 44) from the airbag bag body 30 acts on the back board 46. Is detached from the back panel 44, the upper board 46A is inclined toward the rear of the vehicle around the hinge 51, and an opening through which the airbag 30 can be expanded is formed between the back panel 44 and the upper end of the upper board 46A. Will be.

  FIG. 4A shows an outline of the deployment behavior of the airbag bag body 30 viewed from the front side of the vehicle. Due to the gas ejected from the gas ejection port 58 of the inflator 28, the airbag bag body 30 starts to expand from the gas ejection port 58 side, and the airbag bag body 30 expands upward and is wound in a roll shape. While the folded portion is pushed upward, it is developed as shown in the order of the one-dot chain line, the two-dot chain line, and the solid line in FIG.

  When viewed from the side, first, as shown in FIG. 6 (A), at the beginning of the development, it is developed obliquely upward while being guided by the inner surface of the upper board 46A, and thereafter, as shown by the solid line in FIG. 6 (B). The upper portion of the airbag bag body 30 in the middle of deployment contacts the back window glass 20, and then the airbag bag body 30 is deployed upward along the back window glass 20, and finally the two-dot chain line. As shown, the upper edge portion of the airbag bag body 30 reaches the vicinity of the upper end of the back window glass 20, and the airbag bag body 30 is disposed in the protection area 64.

And in the passenger | crew protection device 10 of this embodiment, the following effects are acquired.
(1) Since the airbag bag body 30 is stored in the first recess 48 provided in the upper part on the back side of the seat back 26, from the first recess 48 as the airbag storage portion to the protection area 64 behind the headrest. The distance until the airbag bag 30 is completely deployed in the protection area 64 behind the headrest can be shortened. Therefore, the occupant protection device 10 of the present embodiment is particularly suitable for a vehicle having a long distance from the ceiling to the protection area 64.

(2) When the airbag bag body is deployed to the rear side of the seat back, the more the seat back tilts backward, the more difficult it is to reach the protection area with the deployment direction of the airbag bag body facing upward. In the occupant protection device 10 of the present embodiment, the airbag bag body 30 can be made to expand in the upward direction by the backboard 46 in the initial stage of inflation of the airbag bag body 30 before reaching the back window glass 20. Therefore, the airbag body 30 can be quickly and reliably deployed in the protection area 64 behind the headrest.

  For example, when there is no upper board 46A as the deployment direction control means, when the airbag bag body 30 is deployed toward the rear side of the vehicle, the angle of the airbag bag body 30 in the deployment direction with respect to the back window glass 20 is Although it becomes larger (see the airbag bag body 30 indicated by the one-dot chain line in FIG. 6B), when there is an upper board 46A, the deployment direction of the airbag bag body 30 is deflected upward. The angle of the deployment direction of the airbag bag body 30 with respect to 20 becomes small (shallow), and the airbag bag body 30 can be smoothly deployed along the back window glass 20.

(3) For example, in a vehicle in which the distance between the headrest and the back window glass is narrow, the airbag bag body is folded and stored in a zigzag shape, and a gap is formed between the seat back and the headrest. There is a possibility that the airbag bag body in the middle of deployment may get caught in the gap between the seat back and the headrest and be caught by the headrest, but the airbag bag body 30 of the present embodiment has the upper edge portion at the time of deployment as an axis. Since it is wound and stored in a roll shape on the vehicle rear side, the portion wound and folded in a roll shape is unwound upward along the upper board 46A in a state facing the vehicle rear, There is no risk that the airbag body 30 in the middle of deployment will sink into the gap between the seat back 26 and the headrest 40 and be caught by the headrest 40. They are deployed in the figure.

(4) If the inflator 28 is vertically arranged in the center in the width direction of the seat back 26, the distance between the back of the occupant 62 and the inflator 28 (second recess 50) is reduced, and the occupant is in the inflator 28. However, in the occupant protection device 10 of the present embodiment, since the inflator 28 oriented vertically is disposed from the center in the seat width direction to the outside in the seat width direction, the inflator 28 is in the width direction of the seat back 26. The distance between the back of the occupant 62 and the inflator 28 is longer than the case where the back of the occupant 62 is vertically arranged in the center, and the foreign object feeling caused by the inflator 28 felt on the back when leaning against the seat back 26 can be reduced. it can.

(5) The airbag bag body 30 is supplied with gas from the vehicle width direction outer side than the seat width direction center line SL. That is, the inflation start position of the airbag bag body 30 is outside the seat width direction center line SL in the vehicle width direction. When viewed from above, gas is supplied into the airbag body 30 from the side where the space between the headrest 40 and the back window glass 20 is narrow (the space t2 side in FIG. 4B). Since the gas flows toward the inner side in the vehicle width direction with a large distance from the wind glass 20, the airbag bag body 30 also expands from the side where the distance between the headrest 40 and the back window glass 20 is narrow to the wide side. Compared to the case where the interval is constant or the airbag bag body 30 is inflated from the wide side to the narrow side, the configuration is easily expanded.

  In the case of a seat in which the inclination angle of the seat back 26 can be changed (a so-called reclining seat), the rearward inclination of the seat back 26 narrows the distance between the headrest 40 and the back window glass 20 so that the airbag bag body 30 is deployed. It is preferable that the maximum inclination angle of the seat back 26 is regulated so as not to be hindered.

[Second Embodiment]
Next, an occupant protection device 10 according to a second embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the same structure as 1st Embodiment, and the description is abbreviate | omitted.
As shown in FIG. 7, in the present embodiment, the sheet material 49 that connects the upper board 46A and the lower board 46B is formed longer than in the first embodiment. 46A and the lower board 46B are held in a relaxed state inside the back board.

  By configuring the hinge 51 in this way, when the airbag bag body 30 is inflated and presses the upper board 46A, as shown in FIG. 7, the lower end of the upper board 46A is at a distance L from the upper end of the lower board 46B. As a result, the upper board 46A is directed in the vertical direction as compared with the first embodiment, and the deployment direction of the airbag bag body 30 can be directed further upward than in the first embodiment.

[Third Embodiment]

Next, an occupant protection device 10 according to a third embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the same structure as embodiment mentioned above, and the description is abbreviate | omitted.
As shown in FIG. 8, the backboard 46 of the present embodiment is not divided into upper and lower portions, and an opening 66 having a size that allows the airbag bag 30 to be deployed is formed on the upper side.

  A U-shaped cut 68 is formed in the sheet material 49 that covers the backboard 46. The cut 68 is a first suture thread (not shown) that breaks when a load of a predetermined value or more is applied. The line stitched by the first suture is a portion to be broken.

On the back side of the sheet material 49, a webbing 70 having a shape as shown in FIG. The force cloth 70 includes a rectangular portion 70A located on the front side of the opening 66, a triangular portion 70B located on both sides in the width direction, and a U-shaped flange portion 70C. The upper end portion of the rectangular portion 70A is It is sewn with a first suture together with the horizontal portion of the cut 68. The U-shaped flange portion 70 </ b> C is fixed to the sheet material 49 with a second suture thread (not shown).
In a normal state, the triangular portion 70 is folded on the back side of the sheet material 49.

  In the present embodiment, the first suture thread stitching the notch 68 is broken by the pressure when the airbag 30 is inflated, and a part of the sheet material 49 is shown as indicated by a two-dot chain line in FIG. And the rectangular portion 70A of the webbing 70 corresponding to the upper board 46A of the above-described embodiment can be inclined to bring the deployment direction of the airbag bag body 30 closer to the upper side.

[Other Embodiments]
In the embodiment described above, the inflator 28 is arranged vertically, but the inflator 28 may be arranged horizontally (horizontal) as shown in FIG.

  Even when the inflator 28 is disposed sideways, the gas outlet 58 is preferably disposed on the side where the distance from the vehicle interior wall surface is short.

  Moreover, when arrange | positioning the inflator 28 facing sideways, it is preferable to arrange | position to the upper end side of the seat back 26 as much as possible. This is because in the vicinity of the upper end of the back of the occupant seated in the seat, the back is away from the seat back 26 as it goes upward, that is, away from the inflator 28.

  In the above embodiment, an example in which the occupant protection device 10 is applied to the rearmost seat 24 has been described. However, the present invention is not limited thereto, and may be applied to seats other than the rearmost seat 24.

  In a two-seater type vehicle, the occupant protection device 10 is applied to a driver seat and a passenger seat.

  In the above embodiment, the gas is directly ejected from the gas ejection port 58 of the inflator 28 into the airbag bag body 30. However, the gas ejection port 58 of the inflator 28 and the airbag bag body 30 are You may connect via a hose etc. In this case, gas is supplied from the air bag side end portion of the hose to the inside of the air bag body 30, so that the air bag side end portion of the hose (in this case, the gas ejection portion) is used as the headrest. What is necessary is just to arrange | position to the side where the space | interval of 40 and the back window glass 20 is narrow. Further, a diffuser or the like may be connected to the inflator 28.

It is sectional drawing of the vehicle which shows the rearmost seat vicinity provided with the passenger | crew protection device. It is the rear view which looked at the seat back inside from the back side. It is a horizontal sectional view of a seat back. (A) is a front view of the vicinity of the seat back showing the deployment process of the airbag bag body, and (B) is a horizontal sectional view of the rear part of the vehicle showing the positional relationship between the rear seat and the back window glass. It is a perspective view which shows a back panel and a back board. (A) is a longitudinal cross-sectional view of the seat back showing the initial deployment state of the airbag bag body, and (B) is a longitudinal cross-sectional view of the seat back showing a state where the airbag bag body is further developed. It is a longitudinal cross-sectional view of the seat back which shows the normal state of the passenger | crew protection apparatus which concerns on 2nd Embodiment, (B) It is a longitudinal cross-sectional view of the seat back which shows the middle of expansion | deployment of an airbag bag body. It is a perspective view which shows the back panel and backboard of the passenger | crew protection apparatus which concern on 3rd Embodiment. It is a perspective view of an inflator and an air bag body of an occupant protection device concerning other embodiments.

Explanation of symbols

8 Vehicle 10 Occupant protection device 20 Back window glass (wall surface behind the passenger compartment)
24 rear seat 26 seat back 28 inflator (gas ejection means)
30 Air bag body 40 Headrest 58 Gas outlet (gas outlet)

Claims (4)

An airbag bag body that is stored in a seat back of a seat with a headrest and that can be deployed toward the upper back side of the seat back;
A gas ejection means provided on the seat back and provided with an ejection portion for ejecting a gas for deploying the airbag bag body;
With
When the headrest and the passenger compartment rear wall surface are viewed in plan, the ejection portion has a gap dimension between the headrest and the passenger compartment rear wall surface rather than the side where the gap dimension between the headrest and the passenger compartment rear wall surface is larger. An occupant protection device located on the small side.   2. The occupant protection device according to claim 1, wherein the gas ejection unit is formed in an elongated shape along a longitudinal direction of the seat back and is disposed on an end portion side in the width direction of the seat back. The vehicle interior rear wall surface has a curved shape in which the vehicle width direction center portion is convex toward the vehicle rear side than the vehicle width direction both ends,
Two or more seats are arranged in the vehicle width direction,
The occupant protection device according to claim 1 or 2, wherein the ejection portion is disposed on the outer side in the vehicle width direction of the seat back.   A vehicle comprising the occupant protection device according to any one of claims 1 to 3.

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