JP6156280B2 - Rear seat airbag device for vehicle - Google Patents

Description

  The present invention relates to a vehicle rear seat airbag device including a rear seat airbag that can be inflated from a roof portion in a vehicle compartment.

In general, at the time of a vehicle collision, it is necessary to inflate and deploy the rear seat airbag from the roof portion in the passenger compartment to protect the rear seat occupant.
Conventionally, there exists a thing indicated by patent documents 1 as such a backseat airbag device of vehicles.

  In other words, an airbag unit is arranged on the top ceiling surface of the vehicle roof, the airbag is stored in the airbag unit, and the airbag is inflated and deployed to hold a rear seat occupant when the vehicle collides. However, an airbag door is provided to support the airbag at the time of deployment, and the airbag does not swing forward of the vehicle when the impact of the rear seat occupant is absorbed.

  In the conventional structure disclosed in Patent Document 1, the airbag rear surface (front surface in the vehicle front-rear direction) is supported by the airbag door while reducing the capacity of the airbag as much as possible. It can absorb the impact of passengers.

  However, in the conventional structure disclosed in Patent Document 1, the above-described airbag door is provided separately, and the airbag door receives a load at the time of shock absorption, and the airbag swings forward of the vehicle. In order to prevent the air bag from being formed, sufficient rigidity is required. For this reason, a reinforcing structure for the air bag door is required, which not only complicates the air bag door and its surrounding structure but also increases the weight. was there.

JP 2010-274898 A

  Therefore, the present invention eliminates the need for an air bag door, prevents the rear seat air bag from swinging to the front side of the vehicle when absorbing the impact, and reliably protects the rear seat occupant without increasing the weight of the vehicle body. can do.

A vehicle rear seat airbag device according to the present invention is a vehicle rear seat airbag device including a rear seat airbag that can be inflated from a roof portion in a vehicle compartment, and the rear seat airbag is formed from the roof portion. A first bag portion that is deployed downward and forward of the rear seat; and a second bag portion that is in contact with an upper portion and a front surface of the first bag portion in a deployed state when the first bag portion is inflated and deployed . In the bag portion, an airbag deployment shape holding member that extends in the front-rear direction of the vehicle and can be folded is provided in the vehicle width direction so that the backup force for the first bag portion is substantially uniform over substantially the entire width in the vehicle width direction. A plurality are provided apart from each other .

  According to the above configuration, when the rear seat airbag is deployed, the second bag portion (especially the rear surface) abuts the upper portion and the front surface of the deployed first bag portion, and the two bag portions repel each other. In this way, the first bag portion is secured independently, thereby suppressing the swinging of the first bag portion toward the front side of the vehicle when the rear seat occupant absorbs an impact, and the conventional airbag door is not required. Thus, the rear seat occupant can be reliably protected without increasing the vehicle body weight.

  In one embodiment of the present invention, the second bag portion is formed such that the rigidity in the vehicle longitudinal direction when the first bag portion is deployed is higher than the stiffness in the vehicle longitudinal direction when the first bag portion is deployed. is there.

  According to the above configuration, since the first bag portion is supported by the second bag portion having high rigidity in the vehicle front-rear direction at the time of deployment, the first bag portion is further improved in its independence, and the first bag portion is absorbed during shock absorption. Can be prevented from swinging forward of the vehicle.

  In one embodiment of the present invention, the second bag portion is configured to have a smaller capacity than the first bag portion, so that rigidity in the vehicle front-rear direction is increased.

According to the above configuration, since the capacity of the second bag portion is small, the second bag portion at the time of deployment has a high tension due to the gas from the inflator, and the rigidity in the vehicle front-rear direction is increased.
As a result, it is possible to achieve both a reduction in the capacity of the rear seat airbag and securing the independence of the first bag portion by the second bag portion.

In one embodiment of the present invention, the second bag portion is deployed such that a lower portion of the second bag portion abuts against a headrest of a seat located in front of the rear seat vehicle.
When the above-mentioned rear seat is the second row seat, the seat located in front of the rear seat vehicle is set as the first row front seat, and when the rear seat is the third row seat The rear seat in the front of the vehicle is set as the second row rear seat.

  According to the above configuration, the lower deployed portion of the second bag portion abuts against the headrest of the seat located in front of the rear seat vehicle, so that the second bag portion is positioned with respect to the headrest at the time of deployment. Since the upper portion and the front surface of the first bag portion are supported by the second bag portion, the first bag portion can be more effectively suppressed from swinging toward the front side of the vehicle when the impact of the rear seat occupant is absorbed.

  In one embodiment of the present invention, the second bag portion is provided with a tether member that regulates the unfolding direction of the second bag portion to the upper portion of the first bag portion and the front surface direction.

  According to the above configuration, the deployment direction of the second bag portion is restricted to the upper portion of the first bag portion and the front surface direction by the tether member provided in the second bag portion. As a result, it is possible to further favorably prevent the first bag portion from swinging toward the front side of the vehicle when absorbing the impact of the rear seat occupant.

  According to the present invention, there is no need for an air bag door, and the rear seat air bag is prevented from swinging to the front side of the vehicle when absorbing the impact without increasing the weight of the vehicle body, thereby reliably protecting the rear seat occupant. There is an effect that can be done.

Side view of essential parts of vehicle equipped with rear seat airbag device of the present invention Sectional drawing which shows the storing state of a rear seat airbag The bottom view which shows the attachment structure of the backseat airbag apparatus along the AA line of FIG. Side view when deploying rear seat airbag Sectional view when the second bag part is unfolded (A) is sectional drawing at the time of expansion | deployment of a 1st bag part, (b) is sectional drawing at the time of expansion | deployment which shows the other Example of a 1st bag part. (A) is sectional drawing at the time of expansion | deployment which shows further another Example of a 1st bag part, (b) is sectional drawing at the time of expansion | deployment which shows further another Example of a 1st bag part. The front view at the time of expansion | deployment which shows the further another Example of a 1st bag part in the state seen from the vehicle rear side

The purpose of the vehicle is to eliminate the need for an air bag door, prevent the rear seat air bag from swinging forward when absorbing shocks, and increase the weight of the vehicle body. A rear seat airbag device for a vehicle including a rear seat airbag that can be inflated from an indoor roof portion, wherein the rear seat airbag is deployed downward from the roof portion and toward the front of the rear seat. And a second bag part that comes into contact with the upper part and the front surface of the first bag part in a deployed state when the first bag part is inflated and deployed, and the second bag part has a backup force against the first bag part. the order to substantially uniformly over substantially the entire width in the vehicle width direction, is achieved in construction of the airbag deployment shape retaining member foldable extending in the longitudinal direction of the vehicle is Ru provided with a plurality at intervals in the vehicle width direction.

An embodiment of the present invention will be described in detail with reference to the drawings.
The drawing shows a rear seat airbag device of a vehicle. In FIG. 1, a floor panel 2 forming a floor surface of a passenger compartment 1 is provided, and a kick-up portion 3 rising upward is provided at the rear end portion of the floor panel 2. The rear floor 4 (specifically, the rear floor panel) is integrally or integrally connected.

  As shown in FIG. 1, a cross member 5 extending in the vehicle width direction is joined and fixed to the rear side of the kick-up portion 3 described above, and the cross-member 5 and the kick-up portion 3 are interposed in the vehicle width direction. A closed cross section 6 extending to the bottom is formed to improve the rigidity of the lower vehicle body.

  The above-mentioned cross member 5 is a vehicle body strength member that extends horizontally in the vehicle width direction between a pair of left and right rear side frames 7 and 7 (however, only the rear side frame on the right side of the vehicle is shown in the drawing). The rear side frame 7 described above is a vehicle body strength member having a hat-like cross section and bonded and fixed to the lower surfaces of the left and right sides of the rear floor 4. The rear side frame 7 and the rear floor 4 are arranged between the front and rear sides of the vehicle. A closed cross section (not shown) extending in the direction is formed.

  As shown in FIG. 1, the floor panel 2 includes front and rear seat brackets 8 and 9 (or cross members) that are spaced apart in the front-rear direction, a seat slide rail 12 that includes a lower rail 10 and an upper rail 11, and a seat. A front seat 14 serving as a front row seat is disposed via the support member 13.

The front seat 14 includes a seat cushion 14C that forms a seating surface of the front seat occupant, a seat back 14B that forms a backrest surface of the front seat occupant, and a headrest 14H that holds the head of the front seat occupant. The seat back 14 </ b> B is configured to be reclinable around the reclining fulcrum 15.
The front seat 14 is divided into a bucket seat structure driver seat (driver's seat) and a passenger seat (passenger seat), but only one front seat 14 is shown in the drawing.
In FIG. 1, the above-described front seat 14 is illustrated as being moved to the rearmost side of the vehicle via the seat slide rail 12.

A rear seat 16 as a rear row seat (second row seat) is disposed in the rear seat pan portion 4a of the rear floor 4 described above.
The rear seat 16 includes a seat cushion 16C that forms a seating surface for the rear seat occupant, a seat back 16B that forms a backrest surface for the rear seat occupant, and a headrest 16H that holds the head of the rear seat occupant. .

  On the other hand, as shown in FIG. 1, a roof panel 17 that covers the upper part of the passenger compartment 1 is provided, and a front header (not shown) extending in the vehicle width direction is bonded and fixed to the lower surface of the front end portion of the roof panel 17. A header closed cross section is formed between the front header and the roof panel to improve roof rigidity. In addition, a rear header (not shown) extending in the vehicle width direction is bonded and fixed to the lower surface of the rear end portion of the roof panel 17, and a header closed cross section is formed between the rear header and the roof panel 17 so that the roof rigidity is increased. We are trying to improve.

  Further, a plurality of roof reinforcements 18 (only the roof reinforcement at a position corresponding to the center pillar is shown in the drawing) are adhered and fixed to the above-described roof panel 17 at a predetermined interval in the vehicle longitudinal direction. Yes. The roof reinforcement 18 is a member extending in the vehicle width direction on the lower surface of the roof panel 17, and a closed cross section 19 (FIG. 2) extending in the vehicle width direction between the roof reinforcement 18 and the roof panel 17. And the roof rigidity is ensured.

  In addition, a top sealing 20 that covers the front header, the rear header, and the roof reinforcement 18 from the vehicle interior side is provided immediately below the roof panel 17. The top ceiling 20 constitutes a roof portion in the passenger compartment 1 that is provided at a distance in the vertical direction with respect to the lower surface of the roof panel 17.

  2 is a cross-sectional view showing the retracted state of the rear seat airbag, FIG. 3 is a bottom view showing the mounting structure of the rear seat airbag device along line AA in FIG. 2, and FIG. It is a side view.

  As shown in FIGS. 1-4, between the roof reinforcement 18 of the position corresponding to a center pillar, and the top ceiling 20, as shown by a virtual line in FIG. 1 and a solid line in FIG. A rear seat airbag unit 21 including a rear seat airbag 30 that can be inflated and deployed from a top sealing 20 as a roof portion in the vehicle compartment is disposed.

  As shown in FIGS. 2 and 4, the rear seat airbag unit 21 includes a rear seat airbag 30 having a first bag portion 31 and a second bag portion 32, and the rear seat airbag 30 is folded. A housing 22 for storing, an inflator 23 that generates gas at the time of a collision, a gas passage 24 that supplies gas from the inflator 23 to the first bag portion 31 via the top deck 22a of the housing 22, and gas from the inflator 23 And a gas passage 25 that supplies the second bag portion 32 via the top deck 22 a of the housing 22.

As shown in FIGS. 2 and 4, the housing 22 described above is formed in a box shape with its lower part opened, and as shown in FIG. 3, the top deck 22a of the housing 22 is separated from the top deck 22a. A plurality of projecting portions 22b projecting outward in the vehicle width direction are formed integrally or integrally, and these projecting portions 22b are attached to a roof reinforcement by using attachment members such as bolts 26 and nuts (not shown). It is fastened and fixed to the ment 18.
Here, the above-described nut is preferably a weld nut that is welded and fixed in advance to the surface of the roof reinforcement 18 on the closed section 19 side, that is, the upper surface, and the bolt 26 is preferably fastened and fixed to the weld nut from the inside of the passenger compartment 1.

As shown in FIGS. 2 and 4, the lower end flange portion 22 c of the housing 22 is fixed to the upper surface of the top ceiling 20 using a plurality of clips 27.
Further, the inflator 23 described above is integrally attached to the outer side surface of the housing 22, in this embodiment, the side surface on the rear side of the box-shaped housing 22, thereby improving the assembly of the rear seat airbag unit 21. In addition, the length of the gas passages 24 and 25 is shortened.

  As shown in FIG. 2, the upper surface of the top ceiling 20 corresponding to the lower open portion of the box-shaped housing 22 has a groove depth at the front edge and rear edge of the lower open portion or in the vicinity thereof. Front and rear hinge portions 20a and 20b are formed by shallow V-shaped grooves (concave portions).

  Further, as shown in FIG. 2, the fragile portion 20c is formed on the upper surface of the top ceiling 20 at the middle position in the front-rear direction of the lower open portion of the box-shaped housing 22 by a V-shaped groove (concave portion) having a deep groove depth. Is forming.

When the rear seat airbag 30 is deployed, the fragile portion 20c breaks the top sealing 20 with the deployment pressure and opens the front hinge 20a as a fulcrum and the rear hinge 20b as a fulcrum. The lid portion 29 to be opened is formed.
The lid portions 28 and 29 formed when the rear seat airbag 30 is deployed by the above-described fragile portion 20c are configured to be divided into two in the front-rear direction, and when the front and rear lid portions 28 and 29 are opened, These lid portions 28 and 29 are configured not to interfere with the rear seat occupant and the headrest 14H of the front seat 14 moved to the vehicle rear side.

  As shown in FIG. 1 and FIG. 4, the first bag portion 31 forming the rear seat airbag 30 is a top seal 20, specifically, between the pair of opened front and rear lids 28, 29 downward and forward of the rear seat (rear). It expands toward the upper front part of the seat space.

Further, as shown in FIG. 4, the second bag portion 32 has an upper surface and a front surface (front surface in the vehicle front-rear direction) of the first bag portion 31 in a deployed state when the first bag portion 31 is inflated and deployed. It abuts against.
In other words, the rear surface of the second bag portion 32 (the rear surface in the vehicle front-rear direction) abuts the front surface of the deployment base portion as the deployment base portion of the deployed first bag portion 31, and the second bag portion 32. Thus, the first bag portion 31 is backed up from the front side of the vehicle.

  Thus, when the rear seat airbag 30 is deployed, the rear surface 32c of the second bag portion 32 abuts on the upper portion and the front surface of the deployed first bag portion 31, and the bag portions 31 and 32 repel each other. Thus, the first bag portion 31 can be secured independently. For this reason, the first bag portion 31 is prevented from swinging to the front side of the vehicle when absorbing the impact of the rear seat occupant, so that an airbag door having a conventional structure is unnecessary. Thus, the rear seat occupant is reliably protected without increasing the weight of the vehicle body.

  As shown in FIG. 4, the first bag portion 31 is formed so that its upper end attachment portion 31 a is attached to the lower surface of the top deck 22 a and communicates with the downstream side of the gas passage 24.

  The second bag portion 32 has its upper end attachment portion 32a attached to the lower surface of the top deck 22a at a position spaced from the upper end attachment portion 31a on the first bag portion 31 side to the front side of the vehicle. It is formed so as to communicate with the downstream side.

  In this embodiment, the first bag portion 31 and the second bag portion 32 are formed so that the gas from the inflator 23 flows separately through the gas passages 24 and 25, respectively. The upper part of the air chamber of the part 31 and the second bag part 32 is made common, and the gas from the inflator 23 flows into the first bag part 31 and the second bag part 32 through the common air chamber upper part. You may comprise as much as possible.

  The second bag portion 32 described above is formed such that the rigidity in the vehicle front-rear direction when the first bag portion 31 is deployed is higher than the rigidity in the vehicle front-rear direction when the first bag portion 31 is deployed. As this specific structure, in this embodiment, as shown in FIG. 4, the capacity of the second bag portion 32 is formed to be smaller than the capacity of the first bag portion 31 at the time of deployment. The rigidity of the portion 32 in the longitudinal direction of the vehicle is configured to be higher than that of the first bag portion 31.

  That is, since the capacity of the second bag portion 32 is small, the second bag portion 32 at the time of deployment has a high tension due to the gas from the inflator 23, and the rigidity in the vehicle front-rear direction is increased. As a result, the rear seat airbag 30 can be reduced in capacity and the first bag portion 31 can be secured by the second bag portion 32 at the same time.

  FIG. 5 is a plan view sectional view when the second bag portion 32 is unfolded. The second bag portion 32 is located on the front cloth member X located rearward in the vehicle front-rear direction and in front of the vehicle front-rear direction. The air bag 33 is formed by sewing the cloth member Y on the back side, and when the second bag portion 32 is deployed, the second bag portion 32 is deployed over substantially the entire width in the vehicle width direction. .

Further, between the inner surfaces of the cloth members X, Y, tether members 34, 34,. The plurality of tether members 34... Maintain the developed shape of the second bag portion 32 in a substantially hollow rectangular shape as shown in FIG. back up force forms so as to be substantially equal at any portion in the vehicle width direction with respect.

  As shown in FIGS. 1 and 4, the second bag portion 32 described above has a headrest 14 </ b> H of the front seat 14, that is, a seat positioned in front of the rear seat 16, the unfolded lower portion 32 b of which is the rear seat. 14 is deployed so as to be in contact with the upper part of the headrest 14H) when the seat is slid to the rearmost side of the vehicle, whereby the second bag portion 32 is positioned with respect to the headrest 14H when deployed, and this positioning is performed. Further, by supporting the upper portion and the front surface of the above-described first bag portion 31 with the second bag portion 32, the first bag portion 31 is prevented from swinging to the front side of the vehicle when the impact of the rear seat occupant is absorbed. It is composed.

  Further, as shown in FIGS. 1 and 4, the second bag portion 32 has a deployment direction of the rear surface 32 c of the second bag portion 32 at the upper portion of the first bag portion 31 in the deployed state, and the first bag portion. A tether member 35 is provided to restrict the front surface of 31.

  Specifically, the tether member 35 is positioned on the outer surface of both side portions in the vehicle width direction of the second bag portion 32 in the deployed state and on the lower portion of the deployment, and both side portions in the vehicle width direction in the housing 22 of the rear seat airbag unit 21. It is provided so as to be stretched between the inner surface when the second bag portion 32 is deployed.

  Because the pair of left and right tether members 35 described above restricts the direction of deployment of the rear surface of the second bag portion 32 to the upper portion of the first bag portion 31 and the front surface direction (see the direction of arrow α in FIG. 4). 32, the upper portion and the front surface of the first bag portion 31 are securely supported, and thereby the first bag portion 31 is prevented from swinging toward the front of the vehicle when the rear seat occupant absorbs an impact. is there.

  FIG. 6A is a plan view sectional view when the first bag portion 31 is unfolded, and the first bag portion 31 is a front cloth member X positioned at the rear in the vehicle front-rear direction and the front in the vehicle front-rear direction. The air bag 36 is formed in an area LE that protects the left rear seat occupant seated on the rear seat 16 by sewing the cloth member Y on the back side located in the area, and the area that protects the center rear seat occupant seated on the rear seat 16 A flat protective part 37 consisting only of the front and back cloth members X and Y is formed on the CE, and an air chamber 36 similar to the left area LE is formed in the area RI that protects the right rear seat occupant seated on the rear seat 16. ing.

  As shown in FIG. 6 (a), the first bag portion 31 has a protection portion 37 at the center in the vehicle width direction, air chambers 36, 36 on the left and right sides, and extends over substantially the entire width in the vehicle width direction. It is configured to be deployed.

  The first bag portion 31 has the structure shown in any of FIGS. 6B, 7A, 7B, and 8 instead of the structure shown in FIG. Also good.

FIG. 6B is a sectional view in plan view showing another embodiment of the first bag portion 31, and the first bag portion 31 is formed by sewing the cloth members X and Y on the front and back sides. The air chambers 36 and 36 are formed in LE and RI, and the air chamber 38 is also formed in the area CE. In other words, the first bag portion 31 has an air chamber 38 in the center in the vehicle width direction and air chambers 36 on the left and right in the vehicle width direction, and is configured to be developed over substantially the entire width in the vehicle width direction. ing.
In particular, since the air chamber 38 is provided at the center in the vehicle width direction, it is possible to improve the shock absorbing performance for the center rear seat occupant seated on the rear seat 16 as compared with the structure shown in FIG.

  (A) of FIG. 7 is a plan view sectional view at the time of deployment showing still another embodiment of the first bag portion 31, and the first bag portion 31 sews the cloth members X and Y on the front and back sides, A plurality of vertical cells C1 extending in the vertical direction of the vehicle are formed in the area LE, a plurality of vertical cells C2, C1 extending in the vertical direction of the vehicle are also formed in the area CE and the area RI, and the first bag portion 31 has a vehicle width. It is comprised so that it may expand | deploy over substantially the full width of a direction.

  (B) of FIG. 7 is a plan view cross-sectional view at the time of development showing still another embodiment of the first bag portion 31, and the first bag portion 31 is sewn on the cloth members X and Y on the front and back sides. A plurality of vertical cells C3 and C4 extending in the vertical direction of the vehicle are formed in the area LE, a plurality of vertical cells C5 and C6 extending in the vertical direction of the vehicle are formed in the area CE, and the area RI also extends in the vertical direction of the vehicle. A plurality of vertical cells C3 and C4 are formed, and the first bag portion 31 is configured to be developed over substantially the entire width in the vehicle width direction.

  Further, in this embodiment shown in FIG. 7B, vertical cells C3 and C5 located on both sides in the vehicle width direction of each area LE, CE, RI are arranged in the middle in the vehicle width direction of each area LE, CE, RI. When the rear seat occupant moves forward in the event of a collision, the rear seat occupant shifts out of the areas LE, CE, RI. It is configured to try to prevent this as much as possible.

FIG. 8 is a front view at the time of unfolding showing still another embodiment of the first bag portion 31 as viewed from the vehicle rear side.
In this embodiment shown in FIG. 8, the first bag portion 31 has an upper cell extending substantially the full width in the vehicle width direction so as to guide gas (gas generated by the inflator 23) from the upper end mounting portion 31a in the left-right direction in the vehicle width direction. C7 and a pair of left and right intermediate vertical cells C8, C8 that are spaced apart in the vehicle width direction corresponding to the rear seat central seat in the vehicle width direction intermediate portion of the upper cell C7, and that guide the gas from the upper cell C7 downward, Connected to both sides in the vehicle width direction of the upper cell C7, the pair of left and right side vertical cells C9 and C9 that guide gas from the upper cell C7 downward, and the lower ends of the pair of left and right side vertical cells C9 and C9 A lower cell C10 that is connected in communication and extends substantially the entire width in the vehicle width direction, a plurality of horizontal cells C11 that are connected between the left side vertical cell C9 and the left middle vertical cell C8 and extend in the vehicle width direction, and the right side Side vertical center A plurality of horizontal cells C12 connected between C9 and the right intermediate vertical cell C8 and extending in the vehicle width direction, and a plurality of horizontal cells C13 connected between the left and right intermediate vertical cells C8 and C8 and extending in the vehicle width direction. It has.

  Here, the side vertical cell C9 and the horizontal cells C11 and C12 communicate with each other through a communication hole (not shown). Further, the lower cell C10 and the lower ends of the intermediate vertical cells C8 and C8 are communicated with each other through a communication hole (not shown). Furthermore, the vehicle longitudinal direction both sides of intermediate | middle vertical cell C8, C8 and the horizontal cell C13 are connected by the communication hole which is not shown in figure.

  The above-described cells C7 to C13 are folded together by using cloth members on the front and back sides and integrally stitched so as to be inflatable and deployable. Further, a plurality of horizontal cells C11 arranged in parallel in the vertical direction correspond to the left seat of the rear seat 16, and a plurality of horizontal cells C13 arranged in parallel in the vertical direction correspond to the central seat of the rear seat 16 and arranged in parallel in the vertical direction. The horizontal cell C12 thus formed corresponds to the right seat of the rear seat 16.

Furthermore, the above-described first bag portion 31 is divided into a horizontal air chamber (upper cell C7, lower cell C10, horizontal cells C11, C12, C13) and a vertical air chamber (intermediate vertical cell C8, side vertical cell C9). By comprising, it is comprised so that the surface rigidity required in order to catch a rear-seat passenger | crew may be ensured.
As the first bag portion 31 described above, any of the structures shown in FIGS. 6A, 6B, 7A, 7B, and 8 is adopted. Also good.
In the figure, arrow F indicates the front of the vehicle, arrow R indicates the rear of the vehicle, and arrow UP indicates the upper side of the vehicle.

The operation of the thus configured rear seat airbag device of the vehicle will be described.
When the vehicle collides, the inflator 23 is activated, and the gas generated in the inflator 23 is supplied to the first bag portion 31 and the second bag portion 32 via the gas passages 24 and 25.

As shown in FIG. 4, the weakened portion 20c of the top sealing 20 is broken by the expansion and deployment pressure of the first bag portion 31 and the second bag portion 32, so that the lid portion 28 is opened with the front hinge portion 20a as a fulcrum. At the same time, the lid portion 29 opens with the rear hinge portion 20b as a fulcrum.
When the gas is introduced into the first bag portion 31, the first bag portion 31 expands downward from the upper end attachment portion 31 a on the lower surface of the top deck 22 a of the housing 22 toward the front of the rear seat.

  The second bag part 32 having a small capacity with respect to the first bag part 31 introduces gas into the air chamber 33 so that the rear surface 32c of the second bag part 32 contacts the upper part and the front surface of the first bag part 31. When the front seat 14 is extended downward from the upper end mounting portion 32a on the lower surface of the top deck 22a of the housing 22 so that the front seat 14 is slid to the rearmost position of the vehicle, the second bag portion 32 is developed. The lower part 32b is developed so as to contact the upper part of the headrest 14H, and the second bag part 32 is positioned with respect to the headrest 14H.

  On the other hand, when the front seat 14 is not slid to the rearmost position of the vehicle, the deployment direction of the rear surface 32c of the second bag portion 32 by the above-described tether member 35 is the upper portion of the first bag portion 31 and the front direction. Regulated by

  In any case, when the rear surface 32c of the second bag portion 32 comes into contact with the upper portion and the front surface of the first bag portion 31, both the bag portions 31 and 32 repel each other to ensure independence. That is, when the first bag portion 31 absorbs the impact of the rear seat occupant, the second bag portion 32 can suppress the swinging of the first bag portion 31 toward the vehicle front side.

  As described above, the vehicle rear seat airbag device according to the above-described embodiment includes the vehicle rear seat airbag device including the rear seat airbag 30 that is inflatable from the roof portion (see the top ceiling 20 and the top deck 22a) of the vehicle interior. The rear seat airbag 30 includes a first bag portion 31 that is deployed downward from the roof portion and toward the front of the rear seat, and a first bag portion that is in a deployed state when the first bag portion 31 is inflated and deployed. And a second bag portion 32 that abuts the upper surface of 31 and the front surface (see FIGS. 1, 2, and 4).

  According to this configuration, when the rear seat airbag 30 is deployed, the rear surface 32c (the rear surface in the vehicle front-rear direction) of the second bag portion 32 is the upper portion of the first bag portion 31 in the deployed state and the front surface (the vehicle front-rear direction). The first bag portion 31 is secured when the rear seat occupant absorbs the impact, and the bag portions 31 and 32 repel each other. Is prevented from swinging to the front side of the vehicle, the conventional airbag door is not required, and the rear seat occupant can be reliably protected without increasing the weight of the vehicle body.

  In an embodiment of the present invention, the second bag portion 32 is formed such that the rigidity in the vehicle longitudinal direction when the first bag portion 32 is deployed is higher than the rigidity in the vehicle longitudinal direction when the first bag portion 31 is deployed. (See FIG. 4).

  According to this configuration, the first bag portion 31 is supported by the second bag portion 32 having high rigidity in the vehicle front-rear direction at the time of deployment. It is possible to suppress the swing of the one bag portion 31 toward the vehicle front side.

  In one embodiment of the present invention, the second bag portion 32 is formed to have a smaller capacity than the first bag portion 31 so that the rigidity in the vehicle front-rear direction is increased (FIG. 4). reference).

According to this configuration, since the capacity of the second bag portion 32 is small, the gas from the inflator 23 causes the second bag portion 32 when deployed to have a high tension, and the rigidity in the vehicle front-rear direction increases.
As a result, it is possible to achieve both the reduction in the capacity of the rear seat airbag 30 and the securing of the independence of the first bag portion 31 by the second bag portion 32.

  In one embodiment of the present invention, the second bag portion 32 is deployed such that the unfolded lower portion 32b abuts the headrest 14H of a seat (see the front seat 14) positioned in front of the rear seat (see the rear seat 16). (See FIGS. 1 and 4).

  According to this configuration, the deployed lower portion 32b of the second bag portion 32 comes into contact with the headrest 14H of the seat (front seat 14) positioned in front of the rear seat (rear seat 16), so that the second bag portion 32 is deployed. Since the second bag portion 32 is positioned between the headrest 14H and the upper portion and the front surface of the first bag portion 31 are supported, the first bag portion 31 is located on the front side of the vehicle when the rear seat occupant absorbs an impact. Can be suppressed even better.

  In one embodiment of the present invention, the second bag portion 32 has a deployment direction of the second bag portion 32 (particularly, a deployment direction of the rear surface 32 c) in the upper and front direction of the first bag portion 31. A tether member 35 for restriction is provided (see FIGS. 1 and 4).

  According to this configuration, the deployment direction of the second bag portion 32 (particularly, the deployment direction of the rear surface 32 c) is on the upper side of the first bag portion 31 and the front surface direction by the tether member 35 provided in the second bag portion 32. Therefore, the upper portion and the front surface of the first bag portion 31 can be more reliably supported by the second bag portion 32, and as a result, the first bag portion 31 is located on the front side of the vehicle when absorbing the impact of the rear seat occupant. Can be suppressed more favorably.

In the correspondence between the configuration of the present invention and the above-described embodiment,
The roof portion of the vehicle interior of the present invention corresponds to the top ceiling 20 and the top deck 22a of the embodiment,
Similarly,
The rear seat airbag device corresponds to the rear seat airbag unit 21,
The rear seat corresponds to the rear seat 16,
The seat located in front of the vehicle in the rear seat corresponds to the front seat 14,
The present invention is not limited to the configuration of the above-described embodiment.

For example, in the above embodiment, the second row seat is described as the rear seat, but the rear seat airbag device of the vehicle of the present invention is configured to protect the rear seat occupant seated on the third row seat. You can also.
In the above embodiment, a three-seat seat having a central seat is illustrated as the rear seat 16, but this may be a two-seat rear seat.

  As described above, the present invention is useful for a vehicle rear seat airbag device including a rear seat airbag that can be inflated from a roof portion in a vehicle interior.

14 ... Front seat (seat located in front of the rear seat)
14H ... Headrest 16 ... Rear seat (rear seat)
20 ... Top sealing (roof in the passenger compartment)
21 ... Rear seat airbag unit (rear seat airbag device)
22a ... Top deck (roof in the passenger compartment)
30 ... rear seat airbag 31 ... first bag portion 32 ... second bag portion
34 ... Tether member (airbag deployment shape holding member)
35 ... Tether member

Claims (5)

A rear seat airbag device for a vehicle including a rear seat airbag that is inflatable from a roof portion in a vehicle compartment,
The rear seat airbag is a first bag portion that is deployed downward from the roof portion and toward the front of the rear seat;
A second bag portion that comes into contact with an upper surface and a front surface of the first bag portion in a deployed state when the first bag portion is inflated and deployed ;
The second bag portion has an airbag deployment shape holding member that extends in the front-rear direction of the vehicle and can be folded in order to make the back-up force for the first bag portion substantially uniform over substantially the entire width in the vehicle width direction. A plurality of rear seat airbag devices provided in the vehicle at intervals . The rear seat airbag of the vehicle according to claim 1, wherein the second bag portion is formed such that rigidity in the vehicle front-rear direction when the first bag portion is deployed is higher than rigidity in the vehicle front-rear direction when the first bag portion is deployed. apparatus. The rear seat airbag device according to claim 2, wherein the second bag portion is formed to have a smaller capacity than the first bag portion so that rigidity in the vehicle front-rear direction is increased. The rear seat airbag device according to any one of claims 1 to 3, wherein the second bag portion is deployed such that a lower portion of the second bag portion is in contact with a headrest of a seat positioned in front of the vehicle in the rear seat. The vehicle according to any one of claims 1 to 4, wherein the second bag portion is provided with a tether member that regulates a deployment direction of the second bag portion to an upper portion and a front surface direction of the first bag portion. Rear seat airbag device.

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