JP2010247800A - Side airbag device for rear seats - Google Patents

Abstract

In a side airbag device installed in a space between a side part of a rear seat back and a body side part, the appearance quality around the rear seat is kept good.
An open end of a module case that accommodates an air bag module is closed by an air bag door. The airbag door 38 includes a vertical wall portion 38A and a horizontal wall portion 38B, and a door side engagement portion 78 formed on the vertical wall portion 38A is engaged with a keyhole-shaped body side engagement formed on the roof side inner panel 20. By being engaged with the hole 80, it is directly fixed to the roof side inner panel 20. The vertical tear portion 84A is set on the vertical wall portion 38A side of the horizontal wall portion 38B, and the lip portion 28C of the opening weather strip 28 extends inward in the vehicle width direction so as to cover the sink 86.
[Selection] Figure 1

Description

  The present invention relates to a rear seat side airbag device provided for an occupant seated in a rear seat.

  Japanese Patent Application Laid-Open Publication No. 2004-228561 discloses a rear seat side airbag device disposed in a space between a side portion of a rear seat back and a body side portion.

  Briefly, the rear seat side airbag device includes a module case elongated in the vehicle vertical direction, and an airbag module including an inflator and a side airbag is accommodated in the module case. The opening of the module case is covered with a cover formed in an L shape in plan view. The cover is fixed by a pressing member formed in a comb shape. Furthermore, a tear portion that breaks when the side airbag is inflated is set on the back side of the cover. The rear seat side airbag device having the above-described configuration is disposed between the side portion of the rear seat back and the body side portion by fixing the bracket protruding from the module case to the body.

Inflated and deployed.

JP 2006-088774 A

  However, in the case of the configuration disclosed in the above prior art, the cover is not fixed to the body and is floatingly supported by the module case, and the fastening point to the body of the airbag module is set at a position away from the cover. Therefore, it is necessary to set a large gap between the airbag module and the body in order to prevent rubbing with the body and abnormal noise. For this reason, the tear portion of the cover is positioned away from the opening flange in the vehicle width direction, and the portion where the tear portion is formed cannot be hidden by the lip portion of the opening weather strip. Since sink marks may occur on the design surface of the portion where the tier portion of the cover is formed, the sink marks are visible from the vehicle interior side, and the appearance quality around the rear seat is degraded.

  In consideration of the above facts, the present invention provides a side airbag device installed in a space between the side portion of the rear seat back and the side portion of the body. It is an object to obtain a side airbag device for use.

  The side airbag device for a rear seat according to the present invention as set forth in claim 1 is installed in a space between the side portion of the rear seat back and the body side portion, and is supplied with gas so that the front of the vehicle is forwarded from the space. An airbag module configured to include a side airbag that is inflated and deployed to the side, a module case that accommodates the airbag module and that is fixed to the side of the body with the opening surface facing the vehicle front side, and Covers the opening surface of the module case and is floatingly supported by the module case. Further, a tear portion is provided on the back side so that the door portion is opened by breaking a predetermined bag inflation pressure. And an airbag door provided with a fixing portion that is directly fixed.

  A rear seat side airbag device according to a second aspect of the present invention is the rear seat side airbag device according to the first aspect, wherein the airbag door extends in the vehicle front-rear direction along the side of the body in a plan view. A vertical wall portion and a horizontal wall portion in which the tier portion is formed and the door portion is deployed, and the fixing portion is set on a surface on the outer side in the vehicle width direction of the vertical wall portion. It is a feature.

  The side airbag device for a rear seat according to the third aspect of the present invention is the invention according to the second aspect, wherein the fixing portion is an engaging portion that protrudes outward in the vehicle width direction from the vertical wall portion, The body side portion is provided with an engaged portion that can engage with the engaging portion.

  The rear seat side airbag device according to a fourth aspect of the present invention is the rear seat side airbag device according to the third aspect, wherein the engaged portion includes a first opening having a first opening width and the first opening. And a second opening having a second opening width that is narrower than the first opening width, and the engaging portion includes the second opening. It is characterized by the engagement protrusion comprised including the neck part which can pass through, and the head part which protruded from the said neck part and was able to be penetrated through the 1st opening part.

  The rear seat side airbag device according to the present invention as set forth in claim 5 is the invention according to any one of claims 1 to 4, wherein the airbag door and the module case are integrally made of resin. It is configured as a molded product, and an integral hinge that functions as the tier portion is provided at an intermediate portion of the integrally molded product, and both ends of the integral molded product protrude from the airbag module. A slit through which the shaft-like fixing member can be inserted is formed, and the module case is configured by bending the integral molded product with the integral hinge.

  According to the first aspect of the present invention, the airbag module is accommodated in the module case, and the opening surface thereof is covered by the airbag door that is floatingly supported by the module case. Here, since this airbag door is directly fixed to the side of the body by the fixing portion, it is necessary to set a large gap between the airbag module and the body in order to prevent friction with the body and noise. Disappear. Further, since the airbag door approaches the side of the body, sink marks formed on the surface side of the portion where the tear portion of the airbag door is formed can be hidden by, for example, the lip portion of the opening weather strip. Therefore, sink marks are not exposed to the rear seat side.

  According to the second aspect of the present invention, the airbag door includes a vertical wall portion extending in the vehicle front-rear direction along the side of the body in a plan view, and a horizontal wall formed with a tier portion to expand the door portion. And a section. And since the fixing | fixed part is set to the surface of the vertical wall part of the vehicle width direction outer side among these, a tear part can be fractured | ruptured rapidly.

  That is, if the strength of the tier portion is high as in the prior art described above, the airbag door tends to extend toward the front side of the vehicle when the side airbag is inflated and deployed, so that force is not efficiently transmitted to the tier portion. For this reason, it is necessary to firmly fix the airbag door to the module case by using a pressing member formed in a comb shape, but the structure becomes complicated.

  On the other hand, in the present invention, since the fixing portion is provided on the vertical wall portion and directly fixed to the body side portion, the deployment load of the side airbag is efficiently transmitted to the tier portion. For this reason, even if it does not have a complicated structure, a tear part is fractured quickly.

  In addition, as described above, sink marks formed on the design surface of the airbag door can be hidden by the lip portion of the opening weather strip, etc., so that the thickness of the tear portion can be reduced and the tear portion can be broken more quickly. Further, it is possible to improve the deployability of the airbag door by partially slitting.

  According to the third aspect of the present invention, the airbag door can be mounted on the body by engaging the engaging portion that protrudes outward in the vehicle width direction from the vertical wall portion with the engaged portion formed on the body side portion. Fixed to the side. Therefore, compared to a structure in which the airbag door is fixed to the body side portion using fasteners such as bolts and nuts, the assembly work to the body side portion of the airbag door is easy and the number of parts is small. That's it.

  According to the fourth aspect of the present invention, first, the head of the engagement protrusion provided on the airbag door side is fitted into the first opening of the engagement hole provided on the body side side. Is done. Next, the neck portion of the engagement protrusion is slid into the second opening of the engagement hole. In the state after sliding, the head of the engaging protrusion cannot pass through the second opening of the engaging hole, so that the engaging protrusion does not inadvertently leave the engaging hole.

  According to the present invention of claim 5, the airbag door and the module case are configured as an integrally molded product made of resin, and an integral hinge is provided at an intermediate portion of the integrally molded product, The integrally molded product can be bent around the integral hinge. And a module case is comprised by bend | folding the said integral molded product by making an integral hinge into a fold line. Further, slits are formed at both ends of the integrally molded product, and a shaft-like fixing member protruding from the airbag module is inserted into the slits. Finally, a fixing member is used to fix the module case integrated with the airbag door.

  As described above, according to the present invention, since the airbag door and the module case are configured as an integrally molded product made of resin, it is possible to simultaneously manufacture both the airbag door and the module case with a single mold. . Therefore, compared with the case where the airbag door and the module case are made of different materials and separate from each other, manufacture is easy. Further, the process of assembling the airbag door to the module case becomes unnecessary, and the work process is simplified.

  As described above, the side airbag device for a rear seat according to the present invention described in claim 1 is a side airbag device installed in a space between the side portion of the rear seat back and the body side portion. It has an excellent effect that the appearance quality around the rear seat can be kept good.

  The side airbag device for a rear seat according to the second aspect of the present invention has an excellent effect that the tear portion can be quickly broken and the side airbag can be quickly inflated to the front side of the vehicle. Have.

  The rear seat side airbag device according to the third aspect of the present invention has an excellent effect that the assembling workability can be improved and the cost can be reduced.

  The rear seat side airbag device according to the fourth aspect of the present invention has an excellent effect that the assembling property of the airbag door can be improved with a simple configuration.

  The rear seat side airbag device according to the fifth aspect of the present invention has an excellent effect of being easily manufactured and capable of reducing the cost.

It is a plane sectional view (1-1 line enlarged sectional view of Drawing 6) showing the whole composition of a side air bag device for backseats concerning a 1st embodiment in vehicles loading. FIG. 2 is a cross-sectional plan view corresponding to FIG. 1 showing a state before the rear seat side airbag device is assembled to the vehicle body. FIG. 2 is an enlarged front view showing the body side engagement hole shown in FIG. 1 as viewed from the vehicle interior side. It is a disassembled perspective view which shows the state before the assembly | attachment to the vehicle body of the side airbag apparatus for rear seats. It is the perspective view which looked at the side airbag device for backseats shown in Drawing 4 from the vehicles front side. FIG. 2 is a perspective view of an interior appearance of a vehicle on which the rear seat side airbag device shown in FIG. 1 is mounted. It is a plane sectional view of the assembled state of the rear seat side airbag device concerning a 2nd embodiment. (A) is a plane sectional view showing a state before the airbag module is assembled to the airbag door & case, and (B) is a plan view showing a state after the airbag module is assembled to the airbag door & case. It is sectional drawing. It is a perspective view of the state before an airbag module is assembled | attached to an airbag door & case. It is a perspective view of the state which assembled | attached the airbag module to the airbag door & case. It is a bottom view which shows the airbag door & case after an assembly seeing from the slit side.

[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. 6 is a perspective view of the interior appearance of a vehicle on which the rear seat side airbag device according to the present embodiment is mounted. As shown in this figure, a rear seat 10 as a rear seat includes a seat cushion 12 on which an occupant is seated, a seat back 14 that is erected on the rear end portion of the seat cushion 12 and is used as the back of the occupant, And a headrest 16 provided at the upper end of the back 14 and supporting the head of the occupant.

  FIG. 1 is a plan sectional view (an enlarged sectional view taken along line 1-1 in FIG. 6) showing the overall configuration of the rear seat side airbag device according to the present embodiment in a vehicle-mounted state. FIG. 2 shows a state before the rear seat side airbag device is assembled to the vehicle body.

  As shown in these drawings, a body side portion 18 is disposed outside the side portion 14A of the seat back 14 of the rear seat 10 in the vehicle width direction. The body side portion 18 includes a roof side inner panel 20 disposed on the vehicle interior side and a side outer panel 22 disposed on the outer side in the vehicle width direction. A front end flange portion 20A is formed at the front end portion of the roof side inner panel 20 along a door opening 26 that is opened and closed by a rear side door 24 (see FIG. 6). A front end flange portion 22 </ b> A is also formed along the door opening 26 at the front end portion of the side outer panel 22. Both front end flange portions 20A and 22A are arranged in contact with each other and joined by spot welding.

  Further, an opening weather strip 28 formed by extruding an elastic material such as rubber is fitted to the front end flange portions 20A and 22A. Note that the opening weather strip 28 has a U-shaped cross section and is fitted to the front end flange portions 20A and 22A, and protrudes outward in the vehicle width direction from the outer side portion of the mounting portion 28A. The inner hollow seal portion 28B formed as described above, and the lip portion 28C extending in a fin shape from the inner side portion of the mounting portion 28A to the rear in the vehicle width direction obliquely rearward.

  A narrow space 30 in the vehicle width direction is formed along the seat back height direction between the roof side inner panel 20 of the body side portion 18 and the side portion 14A of the seat back 14 described above. The rear seat side airbag device 32 of this embodiment is disposed in the space 30 and will be described in detail below.

  The rear seat side airbag device 32 includes an airbag module 34, a module case 36, and an airbag door 38. Hereinafter, it demonstrates in this order. Further, the configuration of the body side portion 18 will be referred to as necessary.

<Airbag module 34>
The airbag module 34 includes a cylindrical inflator 40 that is a gas generating means that generates gas at the time of a side collision, a diffuser 42 that is a rectifying means that surrounds the inflator 40, and a side airbag 44 that is disposed in a folded state. , Is configured as a main part.

  The inflator 40 is arranged with the vehicle up-down direction as a longitudinal direction, and a plurality of gas ejection holes are formed at one end portion or a peripheral wall portion in the longitudinal direction. Further, a plurality of fixing stud bolts 46 are erected on the rear side of the peripheral wall portion of the inflator 40. Furthermore, a squib (ignition device) and an igniter are disposed at the other end of the inflator 40 in the longitudinal direction. The inflator 40 contains a gas generating agent that generates gas by combustion, a filter that removes combustion pieces of the gas generating agent, a coolant that cools high-temperature gas, and the like. However, instead of the gas generating agent-filled inflator 40, a high-pressure gas-filled inflator may be used.

  An outline of an airbag system for operating the inflator 40 will be described. A side collision sensor for detecting a side collision state is disposed at a lower portion of the center pillar. Further, an airbag ECU, which is a control device, is disposed below the console box. When a side collision occurs, the state is detected by the side collision sensor, and the detection signal is output to the airbag ECU. In the air bag ECU, it is determined whether or not the side air bag 44 is to be operated, and when it is determined that the side air bag is in operation, a predetermined current is supplied to the squib and the igniter is ignited.

  As shown in FIG. 1, the diffuser 42 is configured as a polygonal cylinder such as a regular octagon. The diffuser 42 is disposed so as to cover the inflator 40, and rectifies the gas ejected from the inflator 40 and then supplies the gas into the side airbag 44.

  The inflator 40 and the diffuser 42 are inserted into a side airbag 44, which will be described later, folded in a bellows shape. In this inserted state, the inflator 40 and the diffuser 42 are fastened together with a bottom wall portion 36A of the module case 36, which will be described later, with a stud bolt 46 and a nut 48. Has been. In a state where the inflator 40 is fixed, the base fabric of the side airbag 44 is sandwiched between the diffuser 42 and the bottom wall portion 36 </ b> A of the module case 36.

  The side airbag 44 is folded by a predetermined folding method (in the present embodiment, bellows folding). In general, there are two types of airbag folding methods: roll folding and bellows folding. You may fold in combination.

  The airbag module 34 described above is covered with the wrap material 50 and the shape is maintained. The wrap material 50 is easily broken when the side airbag 44 is inflated and deployed.

<Module case 36>
The module case 36 that accommodates the airbag module 34 described above is formed in a substantially box shape that is disposed such that the opening surface faces the front side of the vehicle. A bolt insertion hole 52 through which the above-described stud bolt 46 is inserted is formed in the bottom wall portion 36A of the module case 36. The stud bolt 46 is inserted into the bolt insertion hole 52 from the back side of the bottom wall portion 36A. The air bag module 34 is fixed to the bottom wall portion 36 </ b> A of the module case 36 by screwing the nut 48 onto the stud bolt 46.

  In FIG. 1, the front end portion of the inner side wall portion 36 </ b> B disposed on the inner side in the vehicle width direction of the module case 36 is bent in a substantially L shape toward the side portion 14 </ b> A side of the seat back 14 of the rear seat 10. A plurality of case-side locking portions 54 are formed.

  Further, a plurality of case-side locking holes 56 each formed in a rectangular shape are formed on the front end side of the outer side wall portion 36 </ b> C located outside the module case 36 in the vehicle width direction. A front end portion of a mounting piece 58 manufactured by punching a flat plate is fixed to the outer surface of the outer side wall portion 36C of the module case 36 by welding or the like. A plurality of bolt insertion holes 60 are formed in the rear portion of the attachment piece 58. Correspondingly, a plurality of bolt insertion holes 62 (see also FIG. 4) are formed in the roof side inner panel 20. A weld nut 64 is welded in advance on the same surface as the bolt insertion hole 62 on the outer surface of the roof side inner panel 20 where the bolt insertion hole 62 is formed in the vehicle width direction. Then, the bolt insertion hole 60 of the mounting piece 58 and the bolt insertion hole 62 of the roof side inner panel 20 are coaxially arranged, and the mounting bolt 66 is screwed into the weld nut 64 from the vehicle interior side, whereby the module case 36 is assembled. Is directly fixed to the roof side rail panel 20.

  Referring to the configuration of the roof side inner panel 20, the portion where the bolt insertion hole 62 is formed is the general portion 20 </ b> B of the roof side inner panel 20. The front portion of the roof side inner panel 20 (where the rear seat side airbag device 32 is disposed) is offset from the general portion 20B to the outside in the vehicle width direction through a step 68. Hereinafter, this portion is referred to as “recess 70”. The dimension of each part is set so that the length obtained by adding the depth h of the recess 70 and the plate thickness t of the attachment piece 58 is substantially equal to the plate thickness T of the vertical wall portion 38A of the airbag door 38.

<Airbag door 38>
As shown in FIGS. 1, 4, and 5, the airbag door 38 includes a vertical wall portion 38 </ b> A that extends in the vehicle front-rear direction along the roof side inner panel 20 in a plan view (or a plan view). A horizontal wall portion 38B extending inward in the vehicle width direction from the front end portion of the vertical wall portion 38A. As shown in FIG. 4, the vertical wall portion 38A and the horizontal wall portion 38B are both formed in a rectangular flat plate shape. When the assembled vertical wall portion 38A and the horizontal wall portion 38B are viewed from above the vehicle, The part 38A and the lateral wall part 38B are formed in an L shape.

  A door peripheral wall portion 38C is formed on the back side of the horizontal wall portion 38B. The door peripheral wall portion 38C is composed of three surfaces (three walls) of an upper portion 38C1, a lower portion 38C2 and an inner portion 38C3, and is formed in a U shape when viewed from the vehicle rear side. The outer end portions of the upper portion 38C1 and the lower portion 38C2 of the door peripheral wall portion 38C are connected to the vertical wall portion 38A. Thus, a recess 72 surrounded by a rectangular frame as viewed from the rear side of the vehicle is formed on the back side of the airbag door 38.

  In addition, a plurality of door-side locking holes 74 each formed in a rectangular shape are formed at predetermined intervals in the inner portion 38C3 of the door peripheral wall portion 38C. Further, a plurality of door side locking portions 76 formed in a trapezoidal projection shape in a plan view are formed on a surface of the vertical wall portion 38A facing the inner portion 38C3 of the door peripheral wall portion 38C. 76A of front end surfaces of the door side latching | locking part 76 are arrange | positioned along the vehicle width direction. Further, the rear end surface 76B of the door-side locking portion 76 is an inclined surface having a front width wider than the rear width, and guides when assembling the airbag door 38 to the module case 36. It is used as a surface.

  Further, on the outer surface in the vehicle width direction of the vertical wall portion 38A, a door constituted by a neck portion 78A standing from the vertical wall portion 38A and a head portion 78B integrally formed at the tip of the neck portion 78A. A plurality of side engaging portions 78 are formed. The cross-sectional shape of the neck 78A is a solid circle. The head portion 78B is formed coaxially with the neck portion 78A, and is formed in a disk shape having a radial dimension larger than that of the neck portion 78A.

  Referring to the configuration of the roof side inner panel 20, in the assembled state of the rear seat side airbag device 32, the position of the roof side inner panel 20 that overlaps with the door side locking portion 76 in the recess 70 of the roof side inner panel 20 is engaged. A plurality of body-side engagement holes 80 are formed as portions. As shown in FIG. 3, the body-side engagement hole 80 is formed in a keyhole shape, and includes a large-diameter portion 80A serving as a first opening and a second opening communicating with the large-diameter portion 80A. And a small-diameter portion 80B. The inner diameter (first opening width) R1 of the large diameter portion 80A is set to be larger than the outer diameter D1 of the head portion 78B of the door side engagement portion 78, and the head portion 78B can be inserted through the large diameter portion 80A. ing. Further, the small diameter portion 80B is linearly extended from the outer peripheral front portion of the large diameter portion 80A to the vehicle front side. The inner diameter R2 of the end of the small diameter portion 80B is set slightly larger than the outer diameter D2 of the neck portion 78A, and the neck portion 78A can enter the small diameter portion 80B.

  The airbag door 38 described above is fitted in the module case 36 so that the recess 72 covers the opening surface of the module case 36 in a state where the airbag module 34 is accommodated in the module case 36. In a state where the concave portion 72 of the airbag door 38 is fitted on the opening surface side of the module case 36, the module case 36 is inserted into the door side locking hole 74 formed in the inner side portion 38 </ b> C <b> 3 of the door peripheral wall portion 38 </ b> C of the airbag door 38. The case side locking portion 54 is locked, and the door side locking portion 76 formed in the vertical wall portion 38A of the airbag door 38 is locked in the case side locking hole 56 of the module case 36. The airbag door 38 is floatingly supported by the module case 36.

  Further, a tier portion 84 formed in a substantially U shape when viewed from the vehicle rear side is formed on the back surface side of the lateral wall portion 38B of the airbag door 38 described above. The tier portion 84 is formed along the vertical wall portion 38A and the upper portion 38C1 and the lower portion 38C2 of the door peripheral wall portion 38C. Hereinafter, they are referred to as “vertical tier portion 84A”, “horizontal upper tier portion 84B”, and “horizontal lower tier portion 84C” in this order. The horizontal upper tier portion 84B and the horizontal lower tier portion 84C are shown in FIG. Further, in the present embodiment, both end portions of the vertical direction tear 84A are formed up to both end portions of the horizontal wall portion 38B, but it may be a U-shaped tier portion excluding both end portions.

  Further, the tier portion 84 is formed as a substantially V-shaped (letter-shaped) concave groove. However, the longitudinal tier portion 84A, which is the starting point of breakage (breaking), is a deeper groove than the lateral upper tier portion 84B and the lateral lower tier portion 84C. For this reason, sink marks 86 are formed on the design surface side of the lateral wall portion 38B at positions facing the longitudinal tier portions 84A with deep grooves. In the present embodiment, in the assembled state of the rear seat side airbag device 32 to the body, the lip portion 28C of the opening weather strip 28 extends inward in the vehicle width direction from the formation position of the sink 86, The tip of the lip portion 28C is in contact with the design surface of the lateral wall portion 38B in an elastically deformed state.

  Further, a recessed groove-like hinge portion 88 is formed in a portion adjacent to the inner side portion 38C3 of the door peripheral wall portion 38C on the back surface side of the lateral wall portion 38B. Thereby, when the tear portion 84 is broken, the door portion 90 is developed from the lateral wall portion 38B.

  The airbag door 38 described above is mounted as a part of the side garnish 92 as shown in FIG. In the present embodiment, a part of the side garnish 92 is cut out and the airbag door 38 is mounted separately from the side garnish 92. However, the present invention is not limited to this, and the airbag door is integrated with the side garnish. It may be an airbag door that also serves as a side garnish. Further, the side garnish 92 is used in the case of a sedan type vehicle as in the present embodiment, but the deck side trim is used in the case of a wagon type vehicle.

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

  The rear seat side airbag device 32 according to this embodiment is assembled to the roof side inner panel 20 in the following manner. As shown in FIGS. 2 and 3, first, the head portion 78 </ b> B of the door side engagement portion 78 of the rear seat side airbag device 32 is inserted into the large diameter portion 80 </ b> A of the body side engagement hole 80.

  Next, the rear seat side airbag device 32 is slid to the vehicle front side, and the neck portion 78A of the door side engagement portion 78 is caused to enter the small diameter portion 80B of the body side engagement hole 80. As a result, the head portion 78B of the door side engaging portion 78 is engaged with the peripheral portion of the small diameter portion 80B of the body side engaging hole 80, and the rear seat side airbag device 32 is fixed to the roof side inner panel 20. It becomes a state. When the neck portion 78A enters the small diameter portion 80B, the bolt insertion hole 60 formed in the attachment piece 58 of the rear seat side airbag device 32 overlaps the bolt insertion hole 62 formed in the roof side inner panel 20. . Therefore, the mounting bolt 66 is inserted into both the bolt insertion holes 60 and 62 and screwed into the weld nut 64. As a result, the rear seat side airbag device 32 is completely fixed to the roof side inner panel 20.

  When the vehicle in which the rear seat side airbag device 32 is assembled to the roof side inner panel 20 in the above-described manner comes into a side collision, the rear seat side airbag device 32 operates as follows. First, a side collision state is detected by a side collision sensor (not shown), and the signal is input to the airbag ECU. The airbag ECU determines whether or not the rear-seat side airbag device 32 should be operated based on the input signal, and if it is determined that “side airbag operation”, a predetermined current is supplied to the inflator 40. As a result, the inflator 40 is activated to generate gas, and after the flow of gas is rectified by the diffuser 42, the gas flows into the folded side airbag 44.

  Thereby, as shown by a two-dot chain line in FIG. 1, the side airbag 44 starts to inflate and deploy, and the deployment pressure at that time acts on the back surface of the door portion 90 of the lateral wall portion 38 </ b> B of the airbag door 38. As a result, the lateral wall portion 38B breaks (breaks) from the longitudinal tier portion 84A having the deepest groove depth, and breaks (breaks) into the lateral upper tier portion 84B and laterally lower tier portion 84C. And the door part 90 is expand | deployed inside a vehicle width direction centering on the hinge part 88. FIG. Thereby, the side airbag 44 is inflated and deployed toward the front side of the vehicle, and is interposed between the body side portion 18 and the side surface of the upper body (waist / chest) of the occupant. As a result, the occupant's waist and chest are protected by the side airbag 44.

  Here, in the present embodiment, as described above, the door side engaging portion 78 protruding outward in the vehicle width direction is integrally formed on the vertical wall portion 38A of the airbag door 38, and the door side engaging portion 78 is formed on the roof side. Since it is engaged with the body side engagement hole 80 formed in the inner panel 20, in other words, the airbag door 38 floatingly supported by the module case 36 is directly fixed to the body side portion 18, so that the roof side inner panel Therefore, it is not necessary to set a large gap (space 30) between the airbag module 34 and the roof side inner panel 20 in order to prevent friction with the noise 20 and noise. Moreover, since the airbag door 38 approaches the roof side inner panel 20 by this, the sink 86 (refer FIG. 1) formed in the surface side of the site | part in which the longitudinal direction tear part 84A of the airbag door 38 was formed is an opening weather. The lip portion 28C of the strip 28 can be hidden. Accordingly, the sink marks 86 are not exposed to the rear seat 10 side. Therefore, according to this embodiment, the appearance quality around the rear seat 10 can be kept good.

  In the present embodiment, the airbag door 38 includes a vertical wall portion 38A that extends in the vehicle front-rear direction along the body side portion 18 in a plan view, and a horizontal wall portion 38B in which a tier portion 84 is set. And since the door side engaging part 78 is set in the vehicle width direction outer side surface of the vertical wall part 38A of these, the tear part 84 can be broken quickly.

  That is, if the strength of the tier portion is high as in the prior art described in the background section, the airbag door tends to extend toward the front side of the vehicle when the side airbag is inflated and deployed. I don't get it. For this reason, it is necessary to firmly fix the airbag door to the module case by using a pressing member formed in a comb shape, but the structure becomes complicated.

  On the other hand, in the present embodiment, since the door side engagement portion 78 is provided on the vertical wall portion 38A and directly fixed to the body side portion 18, the side airbag 44 is deployed on the tier portion 84 (vertical direction tier portion 84A). Load is transmitted efficiently. For this reason, the tier portion 84 is quickly broken without a complicated structure.

  Further, as described above, since the sink mark 86 formed on the design surface of the airbag door 38 can be hidden by the lip portion 28C of the opening weather strip 28, the thickness of the vertical direction tear portion 84A is reduced to reduce the vertical direction tear. It is also possible to break the portion 84A more quickly, and to further improve the deployability of the door portion 90 of the airbag door 38 by partially slitting the longitudinal tier portion 84A.

  Further, in the present embodiment, the door side engaging portion 78 protruding outward in the vehicle width direction from the vertical wall portion 38A is engaged with the body side engaging hole 80 formed in the body side portion 18, thereby the airbag. Since the door 38 is fixed to the body side portion 18, the assembly of the airbag door 38 to the body side portion 18 is compared with the structure in which the airbag door is fixed to the body side portion using fasteners such as bolts and nuts. Attaching work is easy and the number of parts is small. As a result, according to the present embodiment, it is possible to improve the assembly workability and reduce the cost.

  Further, in the present embodiment, the door side engaging portion 78 provided on the airbag door 38 side is constituted by the head portion 78B and the neck portion 78A, and the body side engaging hole 80 is constituted by the large diameter portion 80A and the small diameter portion 80B. Since the engagement is established by moving the neck portion 78A to the small diameter portion 80B, the door side engagement portion 78 is not carelessly detached from the body side engagement hole 80. Therefore, the assembling property of the airbag door 38 can be improved with a simple configuration.

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

  FIG. 7 is a plan sectional view showing the assembled state of the rear seat side airbag device according to the present embodiment. FIGS. 8A and 8B are plan sectional views showing the state before and after the airbag module is assembled to the airbag door and case. Furthermore, FIG. 9 shows a perspective view of a state before the airbag module is assembled to the airbag door & case. FIG. 10 is a perspective view showing a state in which the airbag module is assembled to the airbag door & case.

  As shown in these drawings, the rear seat side airbag device 100 includes an airbag module 34 described in the first embodiment, an airbag door & case 102 that accommodates the airbag module 34, It is comprised including.

  As shown in FIGS. 8A and 9, the airbag door and case 102 as an integrally molded product is made of resin and includes a rectangular flat plate-like main body portion 104 in a deployed state. A linear integral hinge 106 is formed at a substantially middle portion of the main body 104. The integral hinge 106 is provided by forming a V-shaped concave groove in the main body 104, and the thickness of the valley of the concave groove is such that it can be broken by the inflation pressure of the side airbag 44. Is set to That is, the integral hinge 106 also serves as the tier portion 84 described in the first embodiment.

  Since the integral hinge 106 is formed, the main body 104 is attached to the door lateral wall 104A corresponding to the lateral wall 38B of the airbag door 38 described in the first embodiment and the vertical wall 38A of the airbag door 38. It is divided into two surfaces of the corresponding door vertical wall portion 104B.

  As shown in FIGS. 9 and 10, the door lateral wall portion 104 </ b> A has a door portion 104 </ b> A <b> 1 having an integral hinge 106 formed at one end and an end portion of the door portion 104 </ b> A <b> 1 near the end opposite to the integral hinge 106. The side wall portion 104A2 is provided, and the first case bottom portion 104A3 is bent from the front end portion of the side wall portion 104A2 toward the door vertical wall portion 104B.

  A hinge portion 88 is formed at a position adjacent to the side wall portion 104A2 in the door portion 104A1. Further, the first case bottom 104A3 is not formed over the entire length of the side wall 104A2, but is formed in a range of about ½ of the side length of the side wall 104A2. In addition, a first slit 108 is formed in the middle portion of the first case bottom 104A3 so as to cut vertically from the free end side.

  On the other hand, at the end of the door vertical wall 104B opposite to the integral hinge 106, there is a second case bottom 104B1 having substantially the same shape that is fitted to the first case bottom 104A3 when bent by the integral hinge 106. Is formed. In addition, a second slit 110 that cuts vertically from the free end side is formed in the intermediate portion of the second case bottom 104B1. Furthermore, the door-side engaging portion 78 described in the first embodiment is formed on the back surface side of the second case bottom portion 104B1.

  As shown in FIGS. 10 and 11, when the door vertical wall portion 104B is bent by the integral hinge 106, a gap 112 having a predetermined gap dimension is formed between the first case bottom portion 104A3 and the second case bottom portion 104B1. Has been. Further, in this state, the first slit 108 and the stud bolt 46 as a fixing member standing from the inflator 40 are inserted into the terminal portion of the first slit 108 and the terminal portion of the second slit 110, respectively. The slit length of the second slit 110 is set.

  As shown in FIGS. 7 and 10, the rear seat side airbag device 100 described above is attached to the body side portion 18 using a bracket 114. The bracket 114 has a base 114A in which a bolt insertion hole 52 into which the stud bolt 46 is inserted is formed, and a bolt insertion hole 60 in which a mounting bolt 66 is inserted by being bent at a right angle from an end of the base 114A. A pair of attachment portions 114B.

(Action / Effect)
According to the above configuration, the rear seat side airbag device 100 is assembled in the following manner. First, as shown in FIGS. 8A and 10, the airbag door & case 102 is set in a deployed state. Next, the airbag module 34 is placed on the side door wall 104A side. At that time, one stud bolt 46 is inserted into the first slit 108 of the first case bottom 104A3. Next, as shown in FIGS. 9 and 10, the door vertical wall portion 104B is bent by the integral hinge 106 so that the second case bottom portion 104B1 is positioned in the same plane as the first case bottom portion 104A3. At that time, the stud bolt 46 on the opposite side is inserted into the second slit 110 of the second case bottom 104B1.

  Thereafter, as shown in FIG. 10, the stud bolt 46 is inserted into the bolt insertion hole 52 of the bracket 114, and the nut 48 is screwed into the through end portion of the stud bolt 46. Thereby, the rear seat side airbag device 100 is configured.

  After that, the door side engaging portion 78 is inserted and engaged into the body side engaging hole 80 in the same procedure as in the first embodiment described above, and then the mounting bolt 66 is formed on the mounting portion 114B of the bracket 114. The bolt insertion hole 60 and the bolt insertion hole 62 formed in the roof side inner panel 20 are inserted and screwed into the weld nut 64. As a result, the rear seat side airbag device 100 is fixed to the body side portion 18.

  As described above, in this embodiment, since the airbag door & case 102 in which the airbag door 38 and the module case 36 described in the first embodiment are configured as an integrally molded product made of resin is manufactured, one mold is used. Thus, the same effect can be obtained as when both the airbag door 38 and the module case 36 are manufactured simultaneously. Therefore, as compared with the case of the first embodiment in which the airbag door 38 and the module case 36 are made of different materials and separated from each other, the module case 36 can be eliminated, so that the manufacturing is easy. Further, the process of assembling the airbag door 38 to the module case 36 is not required, and the work process is simplified. As a result, according to the present embodiment, the rear seat side airbag device 100 can be easily manufactured, and the cost can be reduced.

  In addition, since the door side engaging part 78 is provided also in this embodiment, the effect similar to 1st Embodiment is obtained.

  In the above configuration, the side wall 104A2 is erected with respect to the door 104A1. However, the present invention is not limited to this, and the integral hinge 106 is set at the connection portion between the two, and the airbag door and case are in the deployed state. 102 may be flattened.

10 Rear seat (rear seat)
DESCRIPTION OF SYMBOLS 14 Seat back 14A Side part 18 Body side part 30 Space 32 Rear seat side airbag apparatus 34 Airbag module 36 Module case 38 Airbag door 38A Vertical wall part 38B Horizontal wall part 40 Inflator 44 Side airbag 46 Stud bolt (fixing member) )
54 Case side latching part 56 Case side latching hole 74 Door side latching hole 76 Door side latching part 78 Door side engagement part (engagement protrusion, engagement part, fixing part)
80 Body side engagement hole (engaged part)
84 Tier portion 90 Door portion 100 Side airbag device for rear seat 102 Airbag door and case (integral molded product)
106 Integral hinge 108 First slit 110 Second slit

Claims (5)

An air bag module that includes a side air bag that is installed in a space between the side portion of the rear seat back and the body side portion, and is inflated and deployed from the space to the front side of the vehicle when supplied with gas. When,
A module case that accommodates the airbag module and is fixed to the body side with the opening surface facing the vehicle front side;
Covering the opening surface of the module case, floating supported by the module case, and further provided on the back side with a tear portion that breaks when a predetermined bag inflating pressure acts to deploy the door portion, An airbag door having a fixing portion directly fixed to the
A side airbag device for a rear seat having The airbag door includes a vertical wall portion that extends in the vehicle front-rear direction along the body side portion in a plan view, and a horizontal wall portion that is formed with the tier portion and expands the door portion. ,
The fixed portion is set on the outer surface of the vertical wall portion in the vehicle width direction,
The rear seat side airbag device according to claim 1. The fixed portion is an engaging portion that protrudes outward in the vehicle width direction from the vertical wall portion,
The body side portion is set with an engaged portion to which the engaging portion can be engaged.
The rear seat side airbag device according to claim 2. The engaged portion includes a first opening having a first opening width, a second opening having a second opening width communicated with the first opening and narrower than the first opening width, The engagement hole is configured to include
The engagement portion includes an engagement protrusion configured to include a neck portion that can pass through the second opening portion, and a head portion that protrudes from the neck portion and can be inserted through the first opening portion. Being
The rear seat side airbag device according to claim 3. The airbag door and the module case are configured as an integrally molded product made of resin,
An integral hinge functioning as the tier portion is provided in the intermediate part of the integrally molded product, and shaft-shaped fixing members protruding from the airbag module can be inserted into both ends of the integrally molded product. Slits are formed,
Furthermore, the module case is configured by bending the integral molded product with the integral hinge.
The rear seat side airbag device according to any one of claims 1 to 4, wherein the rear seat side airbag device is provided.

Images