JP2010241192A - Side airbag device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To quickly and suitably inflate/deploy a side airbag when a side part at an outer side in a vehicle width direction of a back board is used as an airbag door. <P>SOLUTION: A pair of upper and lower notch parts 56 are formed on a middle part in a height direction of right and left side frames 24 of a seat back frame 22 respectively. Corresponding to this, on both sides of the middle part in a height direction of a board body 52A of the back board 52, engagement claws 58 insertable to the notch part 56 are formed. The engagement claw 58 is set within a range of a deployment area of a base portion 34A of the side airbag 34. A mounting part set on a lower end part of the back board 52 is fixed to a lower end part of the seat back frame 22 by a bolt and a nut in the state that the engagement claw 58 is inserted from the notch part 56, is upwardly slid and is engaged with a wall part 68 of the side frame 24. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

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

  Patent Document 1 listed below discloses a seat back structure for a vehicle seat provided with a side airbag device.

  Briefly, a backboard is disposed on the back surface of the seatback, and a front end portion of a side portion of the backboard on the outer side in the vehicle width direction extends to the front side of the vehicle with respect to the airbag module. Further, a notch extending in the seat height direction is formed on the back surface of the side portion of the backboard on the outer side in the vehicle width direction.

  According to the above configuration, when a side collision occurs, the side airbag is inflated, and the inflation pressure at that time tends to push the side portion of the backboard outside in the vehicle width direction. For this reason, the said side part is expand | deployed to the vehicle width direction outer side from a notch formation site | part, and a side airbag is inflate-deployed to the vehicle front side.

JP-A-8-324372

  However, in the case of the configuration disclosed in the above prior art, there is a problem described below due to the mounting structure of the backboard to the seatback frame.

  That is, a support plate to which the airbag module is fixed is provided on the side of the backboard on the outer side in the vehicle width direction. And the fitting part integrally formed in this support plate was fitted to the side part on the vehicle width direction outside of the seat back frame from the vehicle rear side, and the lower end part of the backboard was provided at the lower end part of the seat back frame. After engaging the pair of left and right latching pieces, the backboard is detachably attached to the seatback frame by fixing the upper end of the backboard to the reinforcing member laid on the upper part of the seatback frame with a screw or the like. It has a structure.

  That is, the attachment portion of the backboard to the seatback frame is set at a position farther in the vehicle vertical direction than the storage portion of the airbag module. For this reason, when the side airbag is inflated and deployed, the backboard is deformed to the vehicle rear side by the deployment force of the side airbag, and the portion corresponding to the airbag door (the side of the backboard in the vehicle width direction outer side than the notch) The deployment force of the side airbag cannot be sufficiently transmitted to the portion located on the vehicle front side and deployed outward in the vehicle width direction. As a result, it is conceivable that a portion corresponding to the airbag door is not sufficiently deployed, and the deployment delay of the side airbag occurs.

  In consideration of the above-described facts, the present invention provides a vehicle side airbag device capable of quickly and appropriately inflating and deploying a side airbag when the side portion of the backboard in the vehicle width direction is used as an airbag door. Is the purpose.

  The side airbag device for a vehicle according to the first aspect of the present invention is provided on a side portion of the seat back frame on the outer side in the vehicle width direction, and receives the supply of gas at the time of a side collision to inflate and deploy the side airbag. The module is formed in a board shape and is disposed on the vehicle rear side of the seat back frame, and the front end portion of the side portion on the vehicle width direction outer side extends to the vehicle front side from the front end portion of the airbag module, and When receiving the deployment pressure of the side airbag, the side portion is elastically deformed outward in the vehicle width direction around the hinge portion, and has a backboard that inflates and deploys the side airbag toward the vehicle front side along the back surface of the board, The backboard is fixed to at least both side portions of the seat back frame in a state where movement to the vehicle rear side is restricted. .

  A vehicle side airbag device according to a second aspect of the present invention is the vehicle side airbag device according to the first aspect, wherein the backboard is fixed on the outer side in the vehicle width direction and on the intermediate portion side in the seatback vertical direction. The point is characterized in that it is set on the inner side in the vehicle width direction than the hinge portion and within the range of the deployment region with respect to the seat back vertical direction of the root portion of the side airbag.

  A vehicle side airbag device according to a third aspect of the present invention is the vehicle side airbag device according to the first or second aspect, wherein both sides of the seatback frame are spaced apart in the seatback vertical direction. A plurality of notches are formed by opening the door, and the backboard is provided with an engaging portion that can be inserted into the notch and can be engaged with a wall portion in which the notch is formed. It is characterized by that.

  A vehicle side airbag device according to a fourth aspect of the present invention is the vehicle side airbag device according to the first or second aspect, wherein a seat back frame is provided on both sides of the backboard in the vehicle width direction. A plurality of insertion portions are formed at intervals in the vertical direction of the seat back when assembling the seat back, and the insertion portions can be inserted into the insertion portions on both sides of the seat back frame. An engaging portion that can be engaged with the wall portion is set.

  The side airbag device for a vehicle according to a fifth aspect of the present invention is the side airbag device for a vehicle according to the third or fourth aspect, wherein the backboard engages the engaging portion with the wall portion. In this state, it is fixed to the lower part of the seat back frame with a fixing tool.

  According to the first aspect of the present invention, when a side collision occurs, gas is supplied to the side airbag of the airbag module. As a result, the side airbag begins to inflate and deploy, and the deploying pressure at that time acts on the back surface of the side portion of the backboard disposed on the vehicle rear side of the seat back frame in the vehicle width direction. As a result, the side portion of the backboard in the vehicle width direction outside is elastically deformed around the hinge portion toward the vehicle width direction outside, and the side airbag is along the back surface of the board (that is, the side portion of the backboard in the vehicle width direction outside). Inflated and deployed to the front side of the vehicle (guided on the back side). In other words, the lateral side of the backboard in the vehicle width direction functions as an airbag door.

  Here, in the present invention, the backboard is fixed to at least both sides of the seat back frame in a state in which movement to the rear side of the vehicle is restricted. Even if it acts on the rear surface of the side portion on the outer side in the width direction, the backboard does not move away from the both side portions of the seat back frame and move to the vehicle rear side. For this reason, the deployment pressure of the side airbag acts with almost no loss on the back surface of the side portion on the outer side in the vehicle width direction of the backboard functioning as the airbag door. In other words, the deployment pressure of the side airbag can be efficiently applied to the lateral side (airbag door) of the backboard in the vehicle width direction. As a result, the side portion of the backboard on the outer side in the vehicle width direction is elastically deformed to the outer side in the vehicle width direction quickly and appropriately.

  According to the second aspect of the present invention, the fixing point on the outer side in the vehicle width direction of the backboard and on the intermediate portion side in the seatback vertical direction is on the inner side in the vehicle width direction with respect to the hinge portion and on the root portion of the side airbag. Since it is set within the range of the deployment region with respect to the vertical direction of the seat back, a fixed point of the backboard can be obtained at a site that directly receives the deployment force when the side airbag is inflated and deployed.

  According to the third aspect of the present invention, a plurality of notches are formed at both side portions of the seat back frame with a space in the upper direction of the seat back, and the engagement formed on the back board in the notches. After the parts are inserted in correspondence, the backboard is shifted in the seat back up and down direction with respect to both sides of the seat back frame. Thereby, the engaging part of a backboard is engaged with the wall part in which the notch part in the both sides of a seat back frame was formed. If it does in this way, an engaging part and a notch will not appear in the appearance of a seat back.

  In general, the seat back frame is often made of metal. However, in the present invention, the notch portions are set on both sides of the seat back frame, so that the notch portions are formed at the same time when the seat back frame is punched. be able to.

  According to the fourth aspect of the present invention, a plurality of insertion portions are formed on both sides of the seat back board in the vehicle width direction at intervals in the direction of the seat back upward direction when assembled to the seat back frame. Then, after inserting the insertion portion of the backboard so as to correspond to the engaging portions formed on both sides of the seatback frame, the backboard is shifted in the seatback vertical direction with respect to both sides of the seatback frame. Thereby, the engaging part set to the seat back frame is engaged with the wall part in which the insertion part was formed in the backboard. If it does in this way, an engaging part and an insertion part do not appear in the appearance of a seat back.

  In general, the seat back frame is often made of metal, but in the present invention, since the engaging portions are set on both sides of the seat back frame, the strength of the engaging portions is increased. For this reason, when the deploying force of the side airbag acts on the engaging portion via the backboard, the engaging portion is not easily deformed.

  According to the fifth aspect of the present invention, since the backboard is fixed to the lower portion of the seat back frame with the engaging portion engaged with the wall portion, the back board with respect to the seat back frame. The fixed point increases. Therefore, the mounting state of the backboard is stabilized.

  As described above, in the vehicle side airbag device according to the first aspect of the present invention, when the side portion of the backboard on the outer side in the vehicle width direction is used as the airbag door, the side airbag is quickly and appropriately used. It has an excellent effect that it can be expanded and deployed.

  The vehicle side airbag device according to the second aspect of the present invention has an excellent effect that the movement of the backboard to the vehicle rear side can be effectively regulated.

  The vehicle side airbag device according to the third aspect of the present invention can maintain the appearance quality of the seat back satisfactorily, the backboard is easy to assemble, and the seat back frame is relatively manufactured. It has an excellent effect that it can be easily performed.

  The side airbag device for a vehicle according to the fourth aspect of the present invention can maintain the appearance quality of the seat back satisfactorily, the backboard can be easily assembled, and the back against the deployment force of the side airbag. It has an excellent effect of increasing the supporting force of the board.

  The side airbag device for a vehicle according to the present invention according to claim 5 can stabilize the mounting state of the backboard, and the backboard is seated even when a relatively large vehicle body vibration is input to the seat from the vehicle body floor. It has an excellent effect of not coming off the back frame.

It is a perspective view which shows the state which the side airbag apparatus for vehicles which concerns on 1st Embodiment act | operates, and the side airbag is inflate-deployed. It is an expanded sectional view along line 2-2 in FIG. It is an expanded sectional view corresponding to Drawing 2 showing the state in the middle of deployment of the side airbag device for vehicles. FIG. 3 is an enlarged cross-sectional view corresponding to FIG. 2 showing a state where the vehicle side airbag device is not operated. It is a perspective view of a single seat back frame. It is a perspective view of a single backboard. It is a single perspective view of the seat back frame concerning a 2nd embodiment. It is a single perspective view of the backboard concerning a 2nd embodiment. FIG. 6 is an enlarged cross-sectional view corresponding to FIG. 4 showing a modification of the backboard fixing structure. FIG. 9 is an enlarged cross-sectional view corresponding to FIG. 4 and showing another modification of the backboard fixing structure.

[First Embodiment]
Hereinafter, a first embodiment of a vehicle side airbag device according to the present invention will be described with reference to FIGS. In these drawings, an arrow FR appropriately shown indicates the vehicle front side, an arrow UP indicates the vehicle upper side, and an arrow IN indicates the vehicle width direction inner side.

  FIG. 1 is a perspective view of a vehicle seat in a state where the vehicle side airbag device according to the present embodiment is activated. 2 to 4 show operation explanatory diagrams of the vehicle side airbag device. Specifically, FIG. 2 is an enlarged cross-sectional view taken along line 2-2 of FIG. 1, and FIG. 3 corresponds to FIG. 2 in a state where the vehicle side airbag device is being deployed. An enlarged sectional view is shown, and FIG. 4 shows an enlarged sectional view corresponding to FIG. 2 in a state where the vehicle side airbag device is not operated. FIG. 5 shows a perspective view of a single seat back frame, and FIG. 6 shows a perspective view of a single back board. The vehicle seat shown in FIG. 1 is a vehicle seat installed on the passenger seat side of the left-hand drive vehicle.

  As shown in FIG. 1, a vehicle seat 10 includes a seat cushion 12 on which an occupant is seated, a seat back 14 that is tiltably supported on a rear end portion of the seat cushion 12 and is used as a backrest of the occupant, And a headrest 16 that is supported by the upper end portion of the back 14 so as to be movable up and down and supports the head of the occupant.

  Further, the seat back 14 is disposed at the center portion in the seat width direction and is provided integrally with the center portion 14A that directly supports the back of the occupant and the end portion on the vehicle width direction outer side (side door side) of the center portion 14A. And a tunnel side (inside) side portion 14C provided integrally with an end of the center portion 14A on the inner side in the vehicle width direction. In addition, as for the door side side part 14B and the tunnel side side part 14C, all have the shape where the lower part protruded to the vehicle front side rather than the upper part.

  As shown in FIGS. 2 to 4, a cushion seat back pad 18 is disposed on the front side of the seat back 14 of the vehicle seat 10 described above. Further, the front surface and both side surfaces of the seat back pad 18 are covered with a skin 20.

  On the other hand, a metal seat back frame 22 serving as a skeleton member of the seat back 14 is disposed at the rear portion of the seat back 14. As shown in FIG. 5, the seat back frame 22 includes a pair of left and right side frames 24 arranged in parallel in the door side side portion 14 </ b> B and the tunnel side side portion 14 </ b> C of the seat back 14, and the side frames 24. An upper frame 26 connecting the upper ends, a seat back upper reinforcement 28 connecting the upper portions of the left and right side frames 24 in the vehicle width direction, and a seat back lower reinforcement connecting the lower portions of the left and right side frames 24 in the vehicle width direction. And the ment 30.

  Returning to FIGS. 2 to 4, the side frame 24, in a plan view, is a longitudinal wall portion 24 </ b> A extending along the front-rear direction of the seat, and the side frame 24 is bent inward in the seat width direction from the front end portion of the longitudinal wall portion 24 </ b> A A wall portion 24B and a rear wall portion 24C bent inward in the sheet width direction from the rear end portion of the vertical wall portion 24A are provided, and are manufactured by press molding. Further, the upper frame 26 is made of a pipe material, and is formed in a U shape with the seat lower side opened in a front view. Furthermore, both the seat back upper reinforcement 28 and the seat back lower reinforcement 30 are formed in a band plate shape, and both ends in the longitudinal direction thereof are bent toward the vehicle front side.

  In the present embodiment, the seat back frame 22 (the portion excluding the seat back upper reinforcement 28 and the seat back lower reinforcement 30) is provided at the upper end of the pair of side frames 24 formed by press molding. Although it is configured by welding the lower end portions of the upper frame 26 bent in a letter shape, the present invention is not limited to this, and the seat back frame may be manufactured by another method. For example, after punching out the planar development shape of the seat back frame excluding the seat back reinforcement from a single plate material, the upper end portion is sequentially formed into a pipe shape by curling, and then both side portions corresponding to the side frame 24 are side surfaces. The seat back frame may be manufactured by forming it into a plate shape that spreads toward the bottom as viewed downward.

  The vehicle side airbag device 36 that inflates and deploys the side airbag 34 along the inner side surface of the side door at the time of a side collision is provided on the outer side surface of the side frame 24 disposed outside the seat back frame 22 in the vehicle width direction. Is arranged.

  As shown in FIGS. 2 to 4, the vehicle side airbag device 36 includes an inflator (gas generating means) 38 that operates when a side collision occurs and ejects gas, and is disposed on the outer periphery of the inflator 38. A cylindrical diffuser 40 that rectifies the flow, a side airbag 34 that is arranged in a folded state and is inflated and deployed by gas generated from the inflator 38, the inflator 38, the diffuser 40, and a folded side airbag 34. And an air bag module 44 configured to include a wrap member 42 covering the air bag. Note that the wrap member 42 that holds the side airbag 34 in a folded state is easily broken when gas is supplied into the side airbag 34 and the side airbag 34 is inflated.

  The inflator 38 is formed in a substantially cylindrical shape, and is arranged vertically with the longitudinal direction of the side frame 24 as the axial direction. Further, a plurality of stud bolts 46 are erected on the outer peripheral surface of the inflator 38. These stud bolts 46 are inserted into the side frame 24 on the outer side in the vehicle width direction from the outside, and the nut 48 is tightened from the inside. Thus, the airbag module 44 is fixed to the outer surface of the side frame 24. In addition, a gas ejection portion in which a gas ejection port is formed is provided at one end portion (for example, the upper end portion) of the inflator 38 in the axial direction, and gas is supplied from the gas ejection port into the side airbag 34. It has become so.

  As shown in FIG. 4, when the airbag module 44 having the above configuration is fixed to the side frame 24, the front end portion 44 </ b> A of the airbag module 44 has a predetermined length than the front wall portion 24 </ b> B of the side frame 24. It protrudes toward the vehicle front side. Correspondingly, the side portion 18B of the seat back pad 18 protrudes from the central portion 18A toward the outside in the vehicle width direction and obliquely forward while avoiding the front wall portion 24B of the side frame 24. Furthermore, a stepped portion 50 is formed on the back surface side of the side portion 18B so as to avoid interference with the inner corner portion of the front end portion 44A of the airbag module 44.

  A backboard 52 that covers the back side of the seat back 14 is disposed on the vehicle rear side of the seat back frame 22 described above. As shown in FIG. 6, the back board 52 is formed in a curved board shape as a whole. The back board 52 is made of resin.

  The back board 52 includes a board main body 52A disposed substantially parallel to the central portion 18A of the seat back pad 18, an outer side part 52B integrally formed on the vehicle width direction outer side of the board main body 52A, and the board main body 52A. The inner side portion 52C is integrally formed on the inner side in the vehicle width direction. The inner side portion 52C extends to the front side of the vehicle while going around the rear end portion of the side frame 24 on the inner side in the vehicle width direction. On the other hand, as shown in FIG. 4, the outer side portion 52B covers the side surface of the airbag module 44 after turning from the rear side of the side frame 24 on the outer side in the vehicle width direction, and further covers the seat back pad. 18 is extended to the rear end corner of the side portion 18B on the outer side in the vehicle width direction. In other words, the front end portion 52B1 of the outer side portion 52B of the backboard 52 is disposed at a position extended to the vehicle front side by a predetermined distance P from the front end portion 44A of the airbag module 44. Further, the back surface 52B2 of the outer side portion 52B of the backboard 52 faces the outer side surface of the airbag module 44 and forms a guide surface when the side airbag 34 is inflated and deployed.

  Further, a V-groove notch (fragile portion) 54 as a hinge portion is formed over the entire length at the boundary portion between the board main body 52A and the outer side portion 52B of the backboard 52 described above.

  As shown in FIG. 5, rectangular cutout portions 56 are formed on the rear wall portions 24 </ b> C of the left and right side frames 24 of the seat back frame 22 described above at upper and lower portions. Correspondingly, as shown in FIG. 6, notches are formed on both sides of the board body 52 </ b> A in the height direction of the back board 52 when the back board 52 is aligned with the back side of the seat back frame 22. An engaging claw 58 as an engaging portion is provided upright at a position facing 56.

  The engagement claw 58 is formed in a substantially L shape when viewed from the upper side of the board, and is erected from the board main body 52A in a direction perpendicular to the plane (the vehicle front side in the assembled state of the back board 52). More specifically, the engaging claw 58 includes a vertical wall 58A erected in parallel with the vertical wall portion 24A of the seat back frame 22 in the assembled state, and a vehicle width direction from the front end portion of the vertical wall 58A. A horizontal wall 58B bent outward, an extended portion 58C extending obliquely from the tip of the horizontal wall 58B, and a pair of ribs 58D connecting both side edges of the vertical wall 58A and the board body 52A, It is configured. The horizontal wall 58B is formed in a size that can be inserted into the cutout portion 56. When the backboard 52 is assembled to the seat back frame 22, the horizontal wall 58B is a wall portion of the rear wall portion 24C of the side frame 24. 68 to be engaged.

  The distance L between the pair of upper and lower engaging claws 58 that are spaced apart in the height direction of the backboard 52 is a pair of upper and lower portions formed on the rear wall portion 24C of the seat back frame 22 that are spaced apart in the vertical direction. Is set to be the same as the distance M (see FIG. 5) between the notches 56. Further, the pair of upper and lower engaging claws 58 arranged on the outer side in the vehicle width direction has a deployment area S in the seat upper direction of the root portion 34A (see FIG. 1) of the side airbag 34 when the side airbag 34 is deployed. It is set within the range.

  As shown in FIG. 6, a pair of left and right attachment portions 60 are formed at the lower end portion of the backboard 52. The attachment portion 60 is formed in a substantially L shape in a side view and protrudes from the board main body 52A toward the vehicle front side. Moreover, the inside of the attachment portion 60 is hollow, and a bolt insertion hole 62 is formed at the tip portion.

  Correspondingly, the seat back lower reinforcement 30 is formed with a bolt insertion hole 64 coaxially with the bolt insertion hole 62. Then, the bolt insertion hole 62 of the mounting portion 60 and the bolt insertion hole 64 of the seat back lower reinforcement 30 are made to correspond to each other, and a bolt 66 as a fixing tool is inserted, and a nut (not shown) is screwed together, whereby the back The lower end portion of the board 52 is fixed to the lower end portion (seat back lower reinforcement 30) of the seat back frame 22.

  In other words, in the present embodiment, the backboard 52 is fixed only at the three positions of the both sides and the lower end of the seat back frame 22.

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

  The procedure for assembling the backboard 52 to the seatback frame 22 will be described. First, the four engaging claws 58 formed on the board body 52A of the backboard 52 are formed on the side frame 24 of the seatback frame 22. Insert from the notch 56. Next, while the backboard 52 is slid upward along the side frame 24 of the seatback frame 22 in this state, the bolt insertion hole 62 of the mounting portion 60 provided at the lower end of the backboard 52 is inserted into the seatback frame. Align with the bolt insertion hole 64 of the 22 seat back lower reinforcement 30. At this time, the plurality of engaging claws 58 are in a state of being detached from the notch portion 56 and engaged with the wall portion 68 of the side frame 24. Thereafter, the bolt 66 is inserted into both the bolt insertion holes 62 and 64 and the nuts are screwed together, so that the backboard 52 is fixed at three positions on the left and right sides and the lower end.

  When the vehicle in which the backboard 52 is assembled to the seatback frame 22 in the above-described manner comes into a side collision, the vehicle side airbag device 36 operates as follows. First, a side collision state is detected by an airbag sensor (not shown), and the signal is input to the airbag ECU. The airbag ECU determines whether or not the vehicle side airbag device 36 should be operated based on the input signal. When it is determined that the “side airbag is activated”, a predetermined current is supplied to the inflator 38. As a result, the inflator 38 is activated to generate gas, and after the flow of gas is rectified by the diffuser 40, the gas flows into the side airbag 34.

  As a result, as shown in FIG. 3, the side airbag 34 starts to inflate and deploy, and the deployment pressure at that time is applied to the back surface of the outer side portion 52 </ b> B of the backboard 52 disposed on the vehicle rear side of the seat back frame 22. Works. As a result, the outer side portion 52B of the backboard 52 is elastically deformed outward in the vehicle width direction with the notch 54 formed as a hinge (deployment center), and the side airbag 34 extends along the back surface of the outer side portion 52B (that is, Guided by the back surface 52B2 of the outer side portion 52B of the backboard 52), it is stably inflated and deployed toward the front side of the vehicle. In other words, it can be said that the outer side portion 52B of the backboard 52 functions as an airbag door. As a result, the side airbag 34 is interposed between the door trim of the side door and the side surface of the upper body (waist / chest) of the occupant, and the occupant's lumbar region and chest are protected.

  In addition, by using the outer side portion 52B of the backboard 52 as a guide member when the side airbag 34 is inflated and deployed, a part of the seat back pad (urethane pad) is caused to go around the side of the vehicle side airbag device. Compared to the configuration, it is not necessary to tear the urethane pad or the sewn part of the skin when the side airbag is deployed. For this reason, it becomes difficult to be affected by variations in the density and fiber strength of the urethane, and there is a merit that it can lead to cost reduction because the power cloth can be abolished.

  Here, in the present embodiment, when fixing the backboard 52 to the seatback frame 22, a pair of upper and lower engaging claws 58 are set on both sides of the intermediate portion of the board body 52 </ b> A in the backboard 52. A notch 56 is formed in the side frame 24 of the back frame 22 corresponding to the engaging claw 58, and after the engaging claw 58 is inserted from the notch 56, it is engaged with the wall 68 at the top of the notch 56. Therefore, even if the deployment force when the side airbag 34 is inflated and deployed acts on the back surface 52B2 of the outer side portion 52B of the backboard 52, the engagement claw 58 is engaged with the wall portion 68. The outer side part 52B of 52 does not deform and move toward the vehicle rear side. For this reason, the deployment pressure of the side airbag 34 acts with little loss on the back surface 52B2 of the outer side portion 52B of the backboard 52 that functions as an airbag door. In other words, the deployment pressure of the side airbag 34 can be efficiently applied to the outer side portion 52B (airbag door portion) of the backboard 52. As a result, the outer side portion 52B of the backboard 52 is elastically deformed quickly and appropriately outward in the vehicle width direction.

  In summary, according to the vehicle side airbag device 36 according to the present embodiment, when the outer side portion 52B of the backboard 52 is used as an airbag door, the side airbag 34 is quickly and appropriately inflated and deployed. be able to.

  Further, in the present embodiment, the fixing point on the outer side in the vehicle width direction of the backboard 52 and the intermediate portion side in the vertical direction of the seat back is set to the seat in the root portion 34A of the side airbag 34 on the inner side in the vehicle width direction than the notch 54. Since it is set within the range of the deployment region S with respect to the back vertical direction, a fixed point of the backboard 52 can be obtained at a site that directly receives the deployment force when the side airbag 34 is inflated and deployed. As a result, the movement of the backboard 52 toward the vehicle rear side can be effectively restricted.

  Further, in the present embodiment, a pair of upper and lower cutout portions 56 are formed in the side frame 24 of the seatback frame 22 with an interval in the upper direction of the seatback, and the engagement claws formed on the backboard 52 in the cutout portions 56. When the backboard 52 is slid in the seat back vertical direction with respect to the side frame 24 of the seat back frame 22 after the 58 is inserted correspondingly, the engagement claw 58 is engaged with the wall portion 68 of the side frame 24. As a result, the engaging claws 58 and the notches 56 do not appear on the exterior of the seat back 14.

  In general, the seat back frame 22 is often made of metal. However, since the notch portions 56 are set in the side frame 24 of the seat back frame 22, the notch portions 56 are simultaneously formed when the seat back frame 22 is punched. Can be formed.

  As a result, according to the present embodiment, the appearance quality of the seat back 14 can be maintained satisfactorily, the assemblability of the back board 52 is good, and the seat back frame 22 can be manufactured relatively easily. Can do.

  Furthermore, in the present embodiment, the backboard 52 is fixed to the lower end portion (seat back lower reinforcement 30) of the seat back frame 22 with bolts 66 and nuts with the engaging claws 58 engaged with the wall portion 68. Therefore, the fixing point of the back board 52 with respect to the seat back frame 22 increases. For this reason, the attachment state to the seat back frame 22 of the back board 52 is stabilized. As a result, the mounting state of the backboard 52 can be stabilized, and the backboard 52 does not come off the seatback frame 22 even when a relatively large vehicle body vibration is input to the vehicle seat 10 from the vehicle body floor.

[Second Embodiment]
Next, a second embodiment of the vehicle side airbag device according to the present invention will be described with reference to FIGS. 7 and 8. In addition, about the same component as 1st Embodiment mentioned above, the same number is attached | subjected and the description is abbreviate | omitted.

  As shown in FIGS. 7 and 8, the second embodiment is characterized in that the arrangement relationship between the engaging claws 58 and the notches 56 of the first embodiment is reversed.

  Specifically, as shown in FIG. 7, engagement claws 80 as a pair of upper and lower engagement portions are formed on the rear wall portions 24 </ b> C of the left and right side frames 24 of the seat back frame 22. Each engagement claw 80 protrudes toward the vehicle rear side. Each engagement claw 80 is formed by cutting and raising, and is formed in an L shape in a side view.

  Corresponding to this, as shown in FIG. 8, the board body 52A of the backboard 52 is formed with a pair of upper and lower engaged portions 82 on both sides of the intermediate portion in the height direction. The engaged portion 82 protrudes toward the front side of the vehicle, and an engagement hole 84 as an insertion portion into which the distal end bent portion of the engagement claw 80 can be inserted is formed on the lower surface of the distal end portion.

(Action / Effect)
According to the above configuration, after each engaged portion 82 of the backboard 52 is positioned above the bent end portion of the engagement claw 80 of the seatback frame 22, the backboard 52 is slid downward to engage the engagement hole. The bent end of the engaging claw 80 is inserted into 84. As a result, the bent end of the engaging claw 80 is engaged in the engaging hole 84 of the engaged portion 82. In this state, the bolt 66 is inserted into the bolt insertion hole 64 of the seat back lower reinforcement 30 of the seat back frame 22 and the bolt insertion hole 62 of the mounting portion 60, and the nuts are screwed together, whereby the backboard 52 Is fixed to the seat back frame 22.

  Therefore, also in this embodiment, the same effect as the first embodiment described above can be obtained.

  That is, when the outer side portion 52B of the backboard 52 is used as an airbag door, the side airbag 34 can be inflated and deployed quickly and appropriately. Further, since the fixing point of the backboard 52 is obtained at a portion that directly receives the deployment force when the side airbag 34 is inflated and deployed, the movement of the backboard 52 toward the vehicle rear side can be effectively restricted.

  Further, in the present embodiment, a pair of upper and lower engaging claws 80 are formed on the side frame 24 of the seat back frame 22 with an interval in the upper direction of the seat back, and the distal bent portion of the engaging claws 80 is formed on the back board 52. Since it is inserted into the engaging hole 84 of the formed engaged portion 82 and engaged, the engaging claw 80 and the engaged portion 82 do not appear in the appearance of the seat back 14.

  Further, since the engaging claws 80 are set on the side frame 24 of the metal seat back frame 22, the strength of the engaging claws 80 is increased when the deployment force of the side airbag 34 acts on the backboard 52. For this reason, when the deployment force of the side airbag 34 acts on the engaging claw 80 via the back board 52, the engaging claw 80 is difficult to deform.

  As a result, according to the present embodiment, the appearance quality of the seat back 14 can be maintained satisfactorily, the assemblability of the back board 52 is good, and the back board 52 is supported against the deployment force of the side airbag 34. Strength increases.

  Furthermore, in the present embodiment, the backboard 52 is fixed to the lower end portion (seat back lower reinforcement 30) of the seat back frame 22 with bolts 66 and nuts with the engaging claws 58 engaged with the wall portion 68. Therefore, the fixing point of the back board 52 with respect to the seat back frame 22 increases. As a result, the mounting state of the backboard 52 can be stabilized, and the backboard 52 does not come off the seatback frame 22 even when a relatively large vehicle body vibration is input to the vehicle seat 10 from the vehicle body floor.

[Supplementary explanation of the above embodiment]
In the first embodiment described above, the notch 56 is set in the side frame 24 of the seat back frame 22 and the engaging claw 58 is set on the back board 52 side. In the second embodiment, the seat back frame 22 While the engaging claw 80 is set on the side frame 24 and the engaged portion 82 having the engaging hole 84 is set on the backboard 52 side, the present invention is not limited to this, and other configurations may be adopted.

  For example, in the embodiment shown in FIG. 9, a circular hole 90 is formed in the side frame 24 of the seat back frame 22 instead of the notch portion 56, and the engagement claw 58 is replaced on the back board 52 side. A daruma clip 92 is set. According to this configuration, since the notched portion such as the notched portion 56 is not formed in the side frame 24 of the seat back frame 22, there is an advantage that the strength and rigidity of the side frame 24 do not decrease so much.

  Further, for example, in the embodiment shown in FIG. 10, a circular hole 90 is formed in the side frame 24 of the seat back frame 22 in place of the notch portion 56, and a weld nut 96 is previously attached to the rear wall portion 24 </ b> C of the side frame 24. A bolt 98 is set on the backboard 52 side in place of the engagement claw 58. After the bolt 98 is fastened, the lid 99 is attached. According to this configuration, the side frame 24 of the seat back frame 22 is not formed with a defective portion such as the notch 56 or the like, so that the strength and rigidity of the side frame 24 are not reduced so much. Since the fastening force of the weld nut 96 acts firmly on the joint surface between the side frame 24 and the back board 52, there is an advantage that the weld nut 96 can be more reliably fixed.

  The configurations shown in FIGS. 9 and 10 are not included in the inventions described in claims 3 and 4, but are included in the inventions described in claims 1 and 2.

  In the first and second embodiments described above, the backboard 52 is not only fixed to the left and right side frames 24, but also fixed to the seat back lower reinforcement 30. The invention described in 1 includes a structure in which the backboard is not fixed to the lower end portion of the seat back frame.

DESCRIPTION OF SYMBOLS 10 Vehicle seat 14 Seat back 14B Door side side part (vehicle width direction outer side part)
22 Seat back frame 24 Side frame (side of vehicle seat width direction outside of seat back frame)
34 Side Airbag 34A Root Part 36 Vehicle Side Airbag Device 38 Inflator 44 Airbag Module 44A Front End 52 Backboard 52B Outside Side (Backboard Outside Side in the Vehicle Width)
52B1 Front end 52B2 Back 54 Notch (hinge)
56 Notch 58 Engagement claw (engagement part)
66 bolts (fixtures)
68 Wall part 80 Engagement claw (engagement part)
84 Engagement hole (insertion part)
S development area

Claims (5)

An airbag module that is provided on a side portion on the vehicle width direction outer side of the seat back frame and receives a supply of gas at the time of a side collision to inflate and deploy the side airbag;
It is formed in a board shape and is arranged on the vehicle rear side of the seat back frame, and the front end portion of the side portion on the outer side in the vehicle width direction extends to the vehicle front side from the front end portion of the airbag module, and the side airbag A backboard for inflating and deploying the side airbag toward the vehicle front side along the back surface of the board by elastically deforming the side portion around the hinge portion outward in the vehicle width direction when receiving the deployment pressure of
Have
The backboard is fixed to at least both sides of the seat back frame in a state where movement to the vehicle rear side is restricted,
A vehicle side airbag device characterized by the above. The fixing point on the outer side in the vehicle width direction of the backboard and in the intermediate part side in the vertical direction of the seatback is a range of a deployment region with respect to the vertical direction of the seatback of the root portion of the side airbag on the inner side in the vehicle width direction than the hinge part. Set in,
The vehicle side airbag device according to claim 1. On both sides of the seat back frame, a plurality of notches are formed at intervals in the vertical direction of the seat back,
The backboard is provided with an engaging portion that can be inserted into the cutout portion and engageable with a wall portion in which the cutout portion is formed.
The side airbag device for a vehicle according to claim 1 or 2, characterized in that On both sides of the backboard in the vehicle width direction, a plurality of insertion portions are formed at intervals in a direction that becomes a seatback vertical direction when assembled to the seatback frame,
Engaging portions that can be inserted into the insertion portion and engageable with a wall portion on which the insertion portion is formed are set on both sides of the seat back frame.
The side airbag device for a vehicle according to claim 1 or 2, characterized in that The backboard is fixed to the lower part of the seat back frame with a fixture in a state where the engaging portion is engaged with the wall portion.
The side airbag device for a vehicle according to claim 3 or 4, wherein the side airbag device is for vehicles.

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