JP2019112020A - Fitting structure of seat cushion airbag device - Google Patents

Abstract

To improve workability of fitting an air bag module to a rear floor panel.SOLUTION: According to an air bag module ABM in a seat cushion airbag device 40, a seat cushion 21 of a rear seat 20 on a rear floor panel 11 of a vehicle is directly pushed up by an air bag 51, which is fitted to the rear floor panel 11 and is expanded in such a manner that a gas for expansion is supplied thereto from a gas generator 41, and is deformed thereby raising a seating face 21a, and regulates forward movement of a crewman P1 on the seat cushion 21. When fitting the air bag module ABM to the rear floor panel 11, a bracket 65, which has a first fitting part 66 at one end and has a second fitting part 67 at the other end, is used. The bracket 65 is fitted to the rear floor panel 11 at the first fitting part 66. The air bag module ABM is fitted to the second fitting part 67 of the bracket 65.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a mounting structure of a seat cushion air bag device for mounting an air bag module in a seat cushion air bag device for a rear seat of a vehicle to a rear floor panel.

  In a vehicle, when an impact is applied to the same vehicle from the front due to a frontal collision (frontal collision) or the like, the waist of the occupant restrained by the vehicle seat by the seat belt device moves away from the lap belt portion and moves forward (front The sliding phenomenon is a problem. Therefore, various measures have been taken or proposed to suppress this phenomenon.

  In one of them, a gas generator and an air bag are disposed below the seating surface of the seat cushion in a vehicle seat, and the air cushion is inflated by inflating gas supplied from the gas generator. There is a seat cushion airbag device which is configured to suppress the forward movement of a passenger who is deformed and seated.

  For example, Patent Document 1 describes an example in which a seat cushion airbag device is applied to a rear seat. The rear floor panel is provided with a recess whose upper surface is opened and a plate member which opens and closes the opening of the recess. The plate member is tiltably supported by a hinge with respect to a rear end upper portion of the recess. Then, an air bag module comprising a gas generator and an air bag is accommodated in the recess and attached to the bottom of the recess.

  According to the above seat cushion airbag device, in a normal state where the inflation gas is not supplied from the gas generator to the airbag, the plate member covers the recessed portion along the rear floor panel, and the lower portion of the seat cushion approaches this plate member. The cushioning property of the seat cushion is not disturbed, and a good sitting feeling for the occupant can be obtained.

  When a front impact or the like is applied to the vehicle or when an impact is expected to be applied to the vehicle, an inflation gas is supplied from the gas generator to the airbag. By the inflation gas being supplied and the airbag being inflated, the plate material is pushed up to be in a fixed front opening and inclined state, whereby the seat cushion is deformed and the forward movement of the occupant is restricted.

JP 7-81466 A

  However, in the seat cushion airbag device described in Patent Document 1, a configuration is employed in which the recess is covered with a plate material. Therefore, when the air bag module is attached to the bottom of the recess after the plate is attached to the rear floor panel by the hinge, the plate interferes with the attaching operation of the air bag module, and there is room for improvement in the attachment workability. Also, if the plate is attached to the rear floor panel with a hinge after attaching the air bag module to the bottom of the recess, the air bag module interferes with the attaching operation of the plate, and in this case also in terms of attachment workability. There is room for improvement.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a mounting structure of a seat cushion airbag device capable of improving the mounting workability of an airbag module to a rear floor panel. It is.

  The mounting structure of a seat cushion airbag device that solves the above problems is applied to a vehicle including a rear floor panel and a rear seat disposed on the rear floor panel, and an inflation gas is supplied from a gas generator. In the rear floor panel, an airbag module is configured to restrict the forward movement of the object to be restrained on the seat cushion by deforming the seat cushion of the rear seat by pushing up the seat cushion of the rear seat directly by the inflatable airbag. A mounting structure of a seat cushion airbag apparatus to be mounted, wherein a bracket having a first mounting portion at one end and a second mounting portion at the other end is used, in the first mounting portion The bracket is attached to the rear floor panel, and the airbag module is attached to the second attachment portion. It is attached.

  According to the above configuration, when attaching the air bag module to the rear floor panel, the bracket is attached to the rear floor panel at the first attachment portion provided at one end thereof. Also, the air bag module is attached to the second attachment portion provided at the other end of the bracket. In this way, the airbag module is attached to the rear floor panel via the bracket.

  In the mounting structure of the seat cushion airbag device described above, unlike Patent Document 1, a plate material which is supported by a hinge so as to be able to tilt on a rear floor panel and which is pushed up by an expanding airbag is used. Absent. The seat cushion is pushed up directly by the expanding air bag.

  Therefore, the work of supporting the plate material so as to be able to tilt on the rear floor panel by the hinge becomes unnecessary. In addition, the plate does not interfere with the operation of attaching the first attachment portion of the bracket to the rear floor panel or the operation of attaching the air bag module to the second attachment portion of the bracket. Therefore, the attachment workability of the air bag module to the rear floor panel is improved.

  In the mounting structure of the seat cushion airbag device, the gas generator includes a generator main body disposed in the air bag, and a generator fastening bolt that protrudes from the generator main body and is inserted into the air bag. And the air bag module is attached to the second attachment portion by inserting the generator attachment bolt into the second attachment portion and tightening the generator attachment nut to the generator attachment bolt. Is preferred.

  According to the above configuration, the attachment of the air bag module to the second attachment portion is achieved by the generator fastening bolt which protrudes from the generator main body disposed in the air bag and is inserted into the air bag. It is inserted into the mounting portion, and the generator fastening nut is tightened to the generator fastening bolt.

  In the mounting structure of the seat cushion airbag device, the rear floor panel is formed with an accommodating portion for accommodating the generator fastening nut, and the bottom wall portion of the accommodating portion is the same as the accommodating portion in the rear floor panel. And the generator fastening bolt projects downward from the generator body, and the gas generator has the generator body via the air bag. And the generator fastening bolt is disposed in a posture in which the generator fastening bolt is inserted from above with respect to the second mounting part, and the generator fastening nut is disposed in the vertical direction in the vertical direction. Preferably, the generator fastening bolt is tightened between the bottom wall portion of the housing portion and a portion of the rear floor panel adjacent to the housing portion.

  According to the above configuration, in the gas generator, the generator mounting bolt is positioned on the second mounting portion with the generator main body through the air bag and protrudes downward from the generator main body to the second mounting portion. It is arranged in the posture where it is inserted from the top to the other. The generator fastening nut is tightened to the generator fastening bolt from below the second mounting portion. By this tightening, the air bag module is attached to the second attachment portion.

  Here, the generator fastening nut is fastened to the generator fastening bolt in the vertical direction between the bottom wall of the housing and the rear floor panel at a position adjacent to the housing. The generator fastening nut is located at a lower position than when the housing is not formed in the rear floor panel, and the position of the generator fastening bolt and hence the upper end of the generator body is lowered accordingly.

  If the generator fastening nut is located at a position higher in the rear floor panel than the position adjacent to the housing, the position of the generator fastening bolt and hence the upper end of the generator body is increased accordingly. In this case, it is necessary to provide a large depression in the lower part of the seat cushion in order to suppress interference with the generator body.

  In this respect, according to the above configuration, by forming the accommodating portion in the rear floor panel, the position of the upper end portion of the generator main body is lowered, so the depression is made smaller and the seat cushion has an excessively small thickness. It is possible to prevent it from occurring. It is possible to suppress the decrease in cushioning properties caused by the occurrence of excessively thin places in the seat cushion.

  In the mounting structure of the seat cushion airbag device, the generator fastening bolt and the generator fastening nut are preferably separated upward from the bottom wall portion of the housing portion.

  Here, if the generator fastening bolt is in contact with the bottom wall of the housing, a force is applied to lift the generator fastening bolt directly from the bottom wall, There is a risk that the generator fastening bolt etc. will be affected by the force. In addition, when the generator fastening nut is in contact with the bottom wall portion, a force for lifting the generator fastening bolt is indirectly applied to the generator fastening bolt via the generator fastening nut, The generator fastening bolt etc. may be affected by the force.

  In this respect, according to the above configuration, both the generator fastening bolt and the generator fastening nut are separated upward from the bottom wall. Therefore, the force to lift the bolt for generator fastening from the bottom wall is hardly applied directly or indirectly. Therefore, the generator fastening bolt or the like is less susceptible to the force from the bottom wall.

  In the mounting structure of the seat cushion airbag device, the rear floor panel is provided with a bracket fastening bolt projecting upward, and the bracket fastening bolt is provided to a hole opened in the first mounting portion. The bracket is attached to the rear floor panel at the first attachment portion by being inserted from below and by fastening the bracket fastening nut from above the first attachment portion to the bracket fastening bolt. Is preferred.

  Here, even with a structure in which the bracket fastening bolt is protruded downward from the first mounting portion and inserted into the hole formed in the rear floor panel and the bracket fastening nut is tightened from the lower side of the rear floor panel It is possible to attach. However, in this case, water or the like outside the vehicle may intrude into the vehicle through the hole of the rear floor panel.

  In this respect, according to the above configuration, the bracket fastening bolt protrudes upward from the rear floor panel. The bracket fastening bolt is inserted from below into a hole provided in the first mounting portion. And the nut for bracket fastening is tightened from the upper part of the 1st attaching part to the bolt for bracket fastening. By this tightening, the bracket is attached to the rear floor panel at the first attachment portion.

  In order to attach the bracket to the rear floor panel, the rear floor panel is not provided with a hole for communicating the outside of the vehicle with the inside of the vehicle. It is the first mounting portion of the bracket disposed above the rear floor panel, that is, on the inner side of the vehicle, which is perforated. Therefore, water and the like outside the vehicle hardly pass through the rear floor panel and intrude into the vehicle interior.

  According to the mounting structure of the seat cushion airbag device, the mounting workability of the airbag module to the rear floor panel can be improved.

It is a figure which shows one Embodiment of the attachment structure of a seat cushion airbag apparatus, and is a fragmentary perspective view which shows the rear seat to which the same airbag apparatus was applied. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a side sectional view showing a rear seat in one embodiment together with an occupant, an airbag module and a seat belt device. FIG. 3 is a partial side cross-sectional view showing an enlarged X portion in FIG. 2; In one embodiment, a partial side sectional view showing a state where an air bag module is attached to a rear floor panel via a bracket. The partial top view which shows the state in which the several bracket was attached to the rear floor panel in one Embodiment. In one embodiment, a partial side sectional view showing a state before an air bag module is attached to a rear floor panel via a bracket. FIG. 4 is a partial side sectional view showing a state in which the air bag has been inflated, the seat cushion has been deformed, and the seat surface has been raised from the state of FIG. It is a figure corresponding to FIG. 4, and is a fragmentary sectional side view which shows the state to which the airbag module was attached via the bracket of a modification with respect to the rear floor panel of a modification.

Hereinafter, an embodiment in which a mounting structure of a seat cushion airbag device (hereinafter simply referred to as "airbag device") is embodied will be described with reference to Figs.
In the following description, the forward direction of the vehicle is described as the front, and the front, rear, upper, lower, left, and right are defined based on that. In addition, it is assumed that an occupant having the same physical constitution as a dummy for a collision test is seated on the rear seat.

  The floor portion of the vehicle is constituted by floor panels. The front of the floor panel is constituted by the front floor panel, and the rear is constituted by the rear floor panel. As shown in FIGS. 2 and 3, the front portion of the rear floor panel 11 is provided with a vertical wall portion 12 extending substantially in the vertical direction. The front upper end 13 of the rear floor panel 11 is positioned higher than the front floor panel by the vertical wall portion 12.

  A seat cushion 21 of the rear seat 20 is disposed on the rear floor panel 11. The front end portion, the rear end portion, and the like of the seat cushion 21 are provided with locking portions (not shown), and the seat cushion 21 is locked to the rear floor panel 11 at these locking portions.

  As shown in FIG. 1, in addition to the seat cushion 21, the rear seat 20 includes a seat back 22 disposed at the rear end of the seat cushion 21 and a head rest 23 disposed on the seat back 22. Have.

As shown in FIG. 2, the vehicle 10 is equipped with a seat belt device 30 for restraining an occupant P <b> 1 seated on the rear seat 20.
The seat belt device 30 has a belt-like webbing 31 for restraining the occupant P1, a tongue 32 attached to the webbing 31 so as to be movable in the longitudinal direction, and a tongue 32 disposed on one side of the seat cushion 21. And a buckle 33 which is detachably mounted. One end of the webbing 31 is fixed to the side of the seat cushion 21 on which the buckle 33 is not disposed, and the other end is wound by a belt winding device (not shown). In the seat belt device 30, by sliding the tongue 32 against the webbing 31, the lengths of the lap belt portion 34 and the shoulder belt portion 35 can be changed.

  The lap belt portion 34 is a portion from the tongue 32 to the end (fixed end) of the webbing 31 in the webbing 31, and the other side of the seated occupant P1 from the one side of the waist portion PP via the front of the same waist portion PP It is bridged to the side. The shoulder belt portion 35 is a portion from the tongue 32 to the belt winding device in the webbing 31, and is stretched laterally from the shoulder portion of the seated occupant P1 to the side of the waist portion PP via the front of the chest PT. .

  The vehicle is provided with an airbag device for suppressing the submarine phenomenon. The submarine phenomenon is a frontal collision (frontal collision) or the like, when an impact is applied to the vehicle 10 from the front, the seatbelt device 30 restrains the waist of the occupant P1 restrained by the vehicle seat (in this case, the rear seat 20). This is a phenomenon in which the PP moves away from the lap belt portion 34 and moves forward (forward slip).

  As shown in FIG. 3, the airbag device 40 includes an airbag module ABM, an impact sensor 81, and a controller 82. As shown in FIG. 4, the air bag module ABM includes a gas generator 41 and an air bag 51. Next, each part constituting the air bag module ABM will be described.

<About the gas generator 41>
As shown in FIGS. 4 and 5, the main part of the gas generator 41 is constituted by a generator main body 42. The generator body 42 includes an inflator 43 and a retainer 44 that covers the inflator 43, and has a long shape extending in the vehicle width direction as a whole. In the present embodiment, a cylinder type inflator is used as the inflator 43. The inflator 43 has a substantially cylindrical shape, and a gas generating agent (not shown) for generating an inflation gas is accommodated in its inside.

  At one end of the inflator 43 in the vehicle width direction, a gas ejection portion that ejects the inflation gas is provided. Further, a harness serving as an input wiring of a control signal to the inflator 43 is connected to the other end of the inflator 43 in the vehicle width direction.

  In addition, as the inflator 43, a hybrid type inflator using both a gas generating agent and a high pressure gas may be used. In the hybrid type inflator, the igniter is first ignited, and the heat generated by the igniter is ignited to the gas generating agent. The high pressure gas is warmed by the heat of the gas generated along with the combustion of the gas generating agent to increase the pressure, and the pressurized high pressure gas is ejected from the gas ejection part as an expansion gas.

  On the other hand, the retainer 44 functions as a diffuser for controlling the direction in which the inflation gas is ejected, and is a member having a function of attaching the inflator 43 together with the air bag 51 and the like to a plurality of brackets 65 described later. Most of the retainer 44 is formed in a substantially cylindrical shape extending in the vehicle width direction by bending a plate material such as a metal plate. Both ends of the retainer 44 in the vehicle width direction are open.

  Further, in the bottom portion 45 of the retainer 44, holes 46 are respectively opened at a plurality of locations (three locations in the present embodiment) separated from each other in the vehicle width direction. A generator fastening bolt 47 extending in the vertical direction is inserted through each hole 46. Each generator fastening bolt 47 is locked to the bottom 45 by caulking the upper end located in the retainer 44.

  And the gas generator 41 is comprised by the said generator main body 42 and all the bolts 47 for generator fastening. The generator main body 42 may be one in which the inflator 43 and the retainer 44 are integrated. Also, the generator main body 42 may be configured by only the inflator 43. In this case, each generator fastening bolt 47 is directly fixed to the inflator 43.

<About Airbag 51>
The airbag 51 has a rectangular shape in plan view. The air bag 51 has a function of deforming the seat cushion 21 to inflate the seat surface 21a by being inflated by the inflation gas supplied from the gas generator 41 (see FIG. 7). The air bag 51 is formed by folding one sheet of elongated rectangular shape in the front-rear direction or a plurality of cloth pieces (also called a base cloth, a panel cloth, etc.) overlapped in the vertical direction. It is formed by connecting the parts in a bag-like manner. The connection is made at a peripheral connection provided at the peripheral edge of the piece of cloth.

  A material having high strength and flexibility, for example, a woven fabric formed using polyester yarn, polyamide yarn or the like is suitable as the above-mentioned cloth piece. In the air bag 51, a portion surrounded by the peripheral edge joint portion constitutes an inflating portion which is inflated by the inflating gas.

An inner bag (not shown) may be disposed in the air bag 51 and around the generator body 42.
<About the attachment aspect of the gas generator 41 to the air bag 51>
As shown in FIG. 6, the generator main body 42 of the gas generator 41 is disposed at the front end in the air bag 51 so as to extend in the vehicle width direction. The generator fastening bolts 47 extending downward from the bottom 45 of the retainer 44 in the gas generator 41 are inserted through the front lower end of the air bag 51. Most of the generator fastening bolts 47 are exposed to the outside of the air bag 51. The gas generator 41 is engaged with the front end portion of the airbag 51 in a positioned state by the insertion of the generator fastening bolts 47.

The harness of the gas generator 41 is pulled out of the air bag 51.
<About the mounting structure of the air bag module ABM>
As shown in FIGS. 4 to 6, in order to attach the air bag module ABM to the rear floor panel 11, the front upper end 13 of the rear floor panel 11 is located in the rear side of the front upper end 13 of the rear floor panel 11. It has a flat plate shape that extends in the vehicle width direction at a high point compared with the above. Bracket fastening bolts 55 are fixed to the front upper end portion 13 at a plurality of (the same number as the generator fastening bolts 47) separated from each other in the vehicle width direction. Each bracket fastening bolt 55 protrudes upward from the front upper end portion 13.

  The rear floor panel 11 is formed with the same number (three) as the generator fastening bolts 47 as accommodation portions for accommodating the respective generator fastening nuts 73 described later. In the present embodiment, each accommodation portion is constituted by a recess 56 whose upper surface is opened. Each concave portion 56 is formed at a position close to the rear upper side with respect to the front upper end portion 13 of the rear floor panel 11 and at the rear side of each bracket fastening bolt 55.

  Each recess 56 is constituted by a front wall 57 and a rear wall 58 opposed in the front-rear direction, a pair of side walls 59 opposed in the vehicle width direction, and a bottom wall 61. The front wall 57 for each recess 56 is inclined with respect to the vertical direction so as to be lower toward the rear side, and the rear wall 58 is inclined with respect to the vertical direction so as to be lower toward the front side. Due to these inclinations, the distance between the front wall portion 57 and the rear wall portion 58 becomes narrower toward the lower side. The bottom wall 61 of each recess 56 is located at a position lower than the location 14 adjacent to the rear of the rear floor panel 11 with respect to the recess 56.

  Also, in order to attach the air bag module ABM to the rear floor panel 11, the same number (three) of brackets 65 as the generator fastening bolts 47 are used. Each bracket 65 has a first mounting portion 66 constituting a front portion thereof, a second mounting portion 67 constituting a rear portion, and an intermediate portion 68 constituting a space between the first mounting portion 66 and the second mounting portion 67. And have. Each first mounting portion 66 extends in the front-rear direction. Each second attachment portion 67 extends in the front-rear direction at a location lower than each first attachment portion 66. Each middle portion 68 is inclined with respect to the vertical direction so as to be lower toward the rear side. The first attachment portion 66 and the second attachment portion 67 are both bent at an obtuse angle with respect to the middle portion 68.

  The first attachment portion 66 for each bracket 65 is mounted on the front upper end portion 13. A hole 69 is formed in each first mounting portion 66, and the corresponding bracket fastening bolt 55 is inserted into the hole 69 from the lower side. Each bracket 65 is attached to the front upper end portion 13 at its first attachment portion 66 by tightening the bracket fastening nut 71 from the upper side with respect to each bracket fastening bolt 55. In this state, as shown in FIG. 4, in the vertical direction, each second attachment portion 67 is adjacent to the bottom wall portion 61 of each recess 56 and the rear floor panel 11 with respect to the recess 56 on the rear side. It is placed between.

  The front end portion of the air bag module ABM is mounted on each second mounting portion 67. More specifically, it is disposed at the front end of the air bag 51 in a flat state without being filled with inflation gas and at the front end in the air bag 51, and each generator fastening bolt 47 The generator main body 42 of the gas generator 41 inserted into the air bag 51 is placed on the second attachment portion 67 in each recess 56. A hole 72 is formed in each second mounting portion 67, and a corresponding generator fastening bolt 47 is inserted from above into the hole 72. The lower end of each generator fastening bolt 47 is spaced upward from the bottom wall 61 of the corresponding recess 56. Then, the generator fastening nuts 73 are tightened from below to the generator fastening bolts 47, whereby the gas generator 41 is attached to the second mounting portions 67 via the air bags 51. In the present embodiment, as the nut 73 for generator fastening, a cap nut is used, which has a cap on one side and is closed at one end of the screw hole.

In this state, each generator fastening nut 73 is spaced upward from the bottom wall 61 of the corresponding recess 56.
In the airbag module ABM attached to the front upper end 13 via the brackets 65, as shown in FIG. 3, the portion of the airbag 51 excluding the front end is flat without being filled with the inflation gas. The seat cushion 21 is disposed between the rear portion of the rear floor panel 11 and the rear portion of the rear floor panel 11 in a state where the seat cushion 21 is deployed. The rear end portion of the air bag 51 is located below the boundary between the thigh PF and the buttock PB of the occupant P1 seated on the seat cushion 21.

  An impact sensor 81 in the air bag device 40 includes an acceleration sensor or the like, and detects an impact applied to the vehicle 10 from the front. Further, the control device 82 in the air bag device 40 controls the operation of the inflator 43 based on the detection signal from the impact sensor 81.

Next, the operation and effects of the present embodiment configured as described above will be described.
First, an operation of attaching the air bag module ABM to the rear floor panel 11 will be described. This operation is performed before the rear seat 20 is attached to the rear floor panel 11, as shown in FIG.

  First, an operation of attaching the air bag module ABM to a plurality of (three) brackets 65 is performed. The generator fastening bolts 47 exposed downward from the front lower end of the air bag 51 are inserted from above into the corresponding holes 72 in the second mounting portions 67 of the brackets 65. A generator fastening nut 73 is tightened from the lower side of the bracket 65 to each generator fastening bolt 47. These operations are performed for each of the brackets 65.

  Subsequently, the first attachment portions 66 of the plurality of brackets 65 to which the air bag module ABM is attached as described above are brought closer to the front upper end portion 13 from above. In this work, the portion of the air bag 51 expanded flatly without being filled with the inflation gas, except for the front end, was placed on the rear portion of the rear floor panel 11 beyond the concave portion 56 It takes place in the state (see Figure 3).

  A plurality of bracket fastening bolts 55 protruding upward from the front upper end portion 13 are inserted from below to the corresponding holes 69 in the first attachment portion 66 of each bracket 65. Along with the insertion, the first attachment portion 66 of each bracket 65 approaches the front upper end portion 13, the intermediate portion 68 approaches the front wall portion 57, and the second attachment portion 67 approaches the bottom wall portion 61.

  The bracket fastening nuts 71 are tightened from above the brackets 65 with respect to the bracket fastening bolts 55. By performing these operations for each bracket fastening bolt 55, each bracket 65 is attached to the front upper end 13 at the first attachment portion 66. Then, as shown in FIG. 4, the air bag module ABM is attached to the front upper end portion 13 via the plurality of brackets 65. In this state, each generator fastening nut 73 is separated upward from the bottom wall 61 of the corresponding recess 56.

  As described above, in the present embodiment, unlike Patent Document 1, the plate material which is supported by the hinge so as to be able to tilt on the rear floor panel and is pushed up by the expanding air bag to be in the forward opening inclined state is not used. . The seat cushion 21 is directly pushed up and deformed by the inflating air bag 51.

  Therefore, unlike the patent document 1, the operation which supports a board | plate material to a rear floor panel with a hinge becomes unnecessary. Further, the plate prevents the operation of attaching the air bag module ABM to the second attachment portion 67 of each bracket 65, or the operation of attaching the first attachment portion 66 of each bracket 65 to the front upper end portion 13. There is nothing to do. Therefore, the attachment workability of the air bag module ABM to the rear floor panel 11 is improved.

  Subsequently, as shown in FIG. 3, the rear seat 20 is placed on the rear floor panel 11, and the seat cushion 21 is locked to the rear floor panel 11 by the locking portion. Then, the airbag module ABM is mounted in a state of being disposed between the rear floor panel 11 and the seat cushion 21.

  By the way, in the airbag apparatus 40 of the present embodiment, when no impact is applied to the vehicle 10 from the front due to a frontal collision or the like, the control device 82 does not output an operation signal for operating the inflator 43. The inflation gas is not supplied to the air bag 51 from the inflator 43. Most parts except for the front end of the air bag 51 continue to be disposed between the rear floor panel 11 and the seat cushion 21 in a flat state (see FIGS. 2 and 3).

  Here, as shown in FIG. 4, in the vertical direction, each generator fastening nut 73 is a bottom wall portion 61 of each recess 56 and a location 14 adjacent to the recess 56 on the rear floor panel 11 on the rear side. Between, and is tightened to the generator fastening bolt 47. Each generator fastening nut 73 is located at a lower position than when no recess 56 is formed in the rear floor panel 11. Along with this, the position of the generator fastening bolt 47 and thus the upper end of the generator body 42 is lowered.

  If the generator fastening nut 73 is located at a position higher than the location 14, the position of the generator fastening bolt 47 and thus the upper end of the generator body 42 will be increased accordingly. In this case, in order to suppress interference with the generator main body 42, it is necessary to provide a large depression in the lower part of the seat cushion 21.

  In this respect, according to the present embodiment, as described above, the recess 56 for accommodating the generator fastening nut 73 is formed in the rear floor panel 11, whereby the position of the upper end portion of the generator body 42 is lowered. Thus, the recess can be made smaller so that the seat cushion 21 does not have an excessively small thickness. It is possible to suppress a decrease in cushioning properties caused by the occurrence of a portion with an excessively small thickness in the seat cushion 21.

  In addition, if each generator fastening nut 73 is in contact with the bottom wall portion 61 of the recess 56, this is indirectly connected to each generator fastening bolt 47 via the generator fastening nut 73. There is a possibility that each generator fastening bolt 47 and the generator main body 42 may be affected by the force from the bottom wall portion 61. For example, each generator fastening bolt 47 may be pushed up and may come off from the bottom 45 of the retainer 44.

  In this respect, in the present embodiment, each generator fastening nut 73 constituted by a cap nut is separated upward from the bottom wall 61 of the recess 56. Therefore, it is difficult to indirectly apply a force to lift each generator fastening bolt 47 from the bottom wall portion 61 of each recess 56 via the generator fastening nut 73. As a result, each generator fastening bolt 47 is unlikely to be affected by the force from the bottom wall 61, and the generator fastening bolt 47 does not easily come off the bottom 45.

  Furthermore, a bracket fastening bolt 55 is protruded downward from each first mounting portion 66, and this is inserted into a hole formed in the rear floor panel 11, and the bracket fastening nut 71 is tightened from the lower side of the rear floor panel 11. Each bracket 65 can be attached to the rear floor panel 11. However, in this case, water or the like outside the vehicle may intrude into the vehicle through the hole of the rear floor panel 11.

  In this respect, in the present embodiment, each bracket fastening bolt 55 is projected upward from the front upper end portion 13. The respective bracket fastening bolts 55 are inserted from below to the holes 69 provided in the respective first attachment portions 66. Then, a bracket fastening nut 71 is tightened from the upper side of each first mounting portion 66 to each bracket fastening bolt 55. By this tightening, the brackets 65 are attached to the front upper end 13 at the first attachment portion 66.

  In the present embodiment, in order to attach the brackets 65 to the rear floor panel 11, the rear floor panel 11 is not provided with a hole for communicating the outside of the vehicle with the inside of the vehicle. It is the brackets 65 disposed above the rear floor panel 11, i.e., on the vehicle inner side, which are perforated. Therefore, it is unlikely that water or the like outside the vehicle passes through the rear floor panel 11 and invades the inside of the vehicle.

  When an impact is applied to the vehicle 10 from the front due to a frontal collision of the vehicle 10 or the like, the occupant P1 tries to move forward by inertia. The occupant P1 is held on the seat cushion 21 by the holding action of the seat belt device 30. However, depending on the posture of the occupant P1, the waist PP may try to move forward.

  On the other hand, when the impact from the front is applied to the vehicle 10 by a predetermined value or more from the front and the impact sensor 81 detects that, the control device 82 transmits a signal to the inflator 43 through the harness. , An actuation signal for activating this is output. In response to the activation signal, the inflator 43 ejects the inflation gas from the gas ejection part. The inflation gas inflates the air bag 51 as shown in FIG.

  Then, as described above, the seat cushion 21 is pushed up and deformed by the air bag 51 that expands between the rear floor panel 11 and the seat cushion 21, and the seat surface 21 a is raised. The area from the back of the knee PN of the occupant P1 restrained by the seat belt device 30 to the rear seat 20 to the buttock PB is pressed upward by the raised seating surface 21a. Particularly the waist portion PP of the occupant P1 pushed up by this pressing is pressed against the lap belt portion 34 of the seat belt device 30, and the restraining force of the lap belt portion 34 is enhanced. The phenomenon that the waist PP of the occupant P1 moves forward on the seat cushion 21 is restricted.

According to the present embodiment, the following effects can be obtained in addition to the above.
The temporary lower end of the generator fastening bolt 47 is lower than the generator fastening nut 73 by temporarily using a normal nut in which both ends of the screw hole are opened as the generator fastening nut 73 When exposed, there are the following concerns.

  When the bracket 65 vibrates or elastically deforms and the generator fastening bolt 47 contacts the bottom wall 61 of the recess 56, the generator fastening bolt 47 receives a force from the bottom wall 61. This force is directly transmitted to the air bag module ABM through the generator fastening bolt 47, which may loosen the fastening state of the air bag module ABM.

  In this respect, in the present embodiment in which a cap nut is used as the generator fastening nut 73, if the bottom wall 61 of the recess 56 is in contact, the target is the generator fastening bolt 47 instead of the generator fastening bolt. It becomes a nut 73. Part of the force that the generator fastening nut 73 receives from the bottom wall 61 due to the contact is transmitted to the bracket 65. As a result, the force transmitted to the air bag module ABM is reduced, and the fastening state is less likely to be loosened.

In addition, the said embodiment can also be implemented as a modification which changed this as follows.
<About rear floor panel 11>
-Each accommodating part in the rear floor panel 11 may be changed into what has a shape different from the said recessed part 56. As shown in FIG. However, each accommodation portion can accommodate each generator fastening nut 73, and the bottom wall portion 61 is located at a position lower than the location 14 adjacent to the accommodation portion on the rear floor panel 11 on the rear side. It is necessary to be.

  FIG. 8 shows an example thereof. In this modification, the height of the front upper end 13 in the rear floor panel 11 is changed to the same height as the bottom wall 61 of the recess 56 in the above embodiment. The bottom wall 61 extends forward and is connected to the vertical wall 12 of the rear floor panel 11. The extended portion of the bottom wall 61 (the front of the bottom wall 61) corresponds to the front upper end 13 of the rear floor panel 11.

  The shape of each bracket 65 is changed along with the change in shape of the housing portion. In each bracket 65, the first attachment portion 66 extends in the front-rear direction on the front upper end portion 13. The second attachment portion 67 extends in the front-rear direction at a location higher than the first attachment portion 66. An intermediate portion 68 connecting the first attachment portion 66 and the second attachment portion 67 is inclined to be higher toward the rear side.

  In addition, the point that each bracket 65 is attached to the front upper end portion 13 in the first attachment portion 66 and the point that the airbag module ABM is attached to the second attachment portion 67 of each bracket 65 are the above-described embodiments. It is the same as the form.

  Therefore, although the first attachment portion 66 of each bracket 65 is attached to the front upper end portion 13 at a position lower than the second attachment portion 67, although it differs from the above embodiment, the same operation and effect as the above embodiment Is obtained.

<About the gas generator 41>
The gas generator 41 may be disposed at a location different from the above embodiments, for example, at the rear end of the rear floor panel 11 in the front-rear direction. Further, the gas generator 41 may be disposed at the central portion of the rear floor panel 11 or at the side portion in the vehicle width direction. Furthermore, the gas generator 41 may be disposed in a direction different from that of the above embodiment, for example, with the axis of the inflator 43 aligned in the front-rear direction.

<About Airbag 51>
The air bag 51 may be disposed between the rear floor panel 11 and the seat cushion 21 in a folded state.

  The air bag 51 may be configured substantially entirely by the inflating portion, or may have a non-inflating portion that is not supplied with the inflating gas and does not expand. .

<About the generator fastening nut 73>
-As each generator fastening nut 73, the normal nut by which the both ends of the screw hole were open may be used.

  In this case, the lower end of each generator fastening bolt 47 may be lower than the lower end of each generator fastening nut 73 depending on the manner in which each generator fastening nut 73 is tightened. When each generator fastening bolt 47 comes into contact with the bottom wall 61 of each housing (recess 56), the force to lift the generator fastening bolt 47 directly from the bottom wall 61 As a result, the generator fastening bolt 47 and the like may be affected by the force from the bottom wall 61.

  Therefore, it is desirable to separate the generator fastening bolt 47 and the generator fastening nut 73 from the bottom wall 61 of each recess 56 upward. In this case, it is difficult to directly or indirectly apply a force to lift the generator fastening bolt 47 from the bottom wall portion 61 of each accommodation portion (recess portion 56). Therefore, the generator fastening bolt 47 and the like are less susceptible to the force from the bottom wall portion 61.

<Others>
The controller 82 may supply inflation gas from the gas generator 41 to the air bag 51 when it is predicted that an impact from the front due to a front collision or the like is applied to the vehicle 10.

  An object other than the occupant P1, for example, a load or the like may be the object to be restrained by the air bag device 40. Even when the luggage or the like is placed on the seat cushion 21 as the object to be restrained, the same effect as that of the above embodiment can be obtained.

The rear seat 20 may be a seat for single use or a seat for multiple use.
The vehicles to which the airbag device 40 is applied include various industrial vehicles as well as private vehicles.

  DESCRIPTION OF SYMBOLS 10 Vehicle 11 11 rear floor panel 14 location 20 rear seat 21 seat cushion 40 seat cushion airbag device 41 gas generator 42 generator body 47 generator fastening bolt DESCRIPTION OF SYMBOLS 51 ... Air bag, 55 ... Bracket fastening bolt, 56 ... Recess (accommodation part), 61 ... Bottom wall part, 65 ... Bracket, 66 ... 1st attachment part, 67 ... 2nd attachment part, 69 ... hole, 71 ... Nut for bracket fastening, 73: nut for fastening generator, ABM: air bag module, P1: occupant (restrained object).

Claims (5)

It is applied to a vehicle including a rear floor panel and a rear seat disposed on the rear floor panel,
The seat cushion of the rear seat is directly pushed up and deformed by the air bag which is supplied with inflation gas from the gas generator and inflated, so as to restrict the forward movement of the object to be restrained on the seat cushion. A seat cushion airbag assembly mounted to the rear floor panel;
A bracket having a first attachment at one end and a second attachment at the other end,
A mounting structure of a seat cushion airbag device, wherein the bracket is attached to the rear floor panel at the first attachment portion, and the airbag module is attached to the second attachment portion. The gas generator includes a generator main body disposed in the air bag, and a generator fastening bolt which protrudes from the generator main body and is inserted into the air bag.
The air bag module is mounted on the second mounting portion by inserting the generator mounting bolt into the second mounting portion and tightening the generator mounting nut to the generator mounting bolt. The attachment structure of the seat cushion airbag apparatus of claim 1. The rear floor panel is formed with an accommodating portion for accommodating the generator fastening nut,
The bottom wall portion of the housing portion is located at a position lower than a position adjacent to the housing portion in the rear floor panel,
The generator fastening bolt projects downward from the generator body,
The gas generator is disposed in a posture in which the generator main body is positioned on the second mounting portion via the air bag, and the generator fastening bolt is inserted from above to the second mounting portion. And
The generator fastening nut is tightened to the generator fastening bolt in the vertical direction between the bottom wall portion of the housing and a portion of the rear floor panel adjacent to the housing. The mounting structure of the seat cushion airbag device according to claim 2.   The seat cushion airbag mounting structure according to claim 3, wherein the generator fastening bolt and the generator fastening nut are spaced upward from the bottom wall of the housing. The rear floor panel is provided with a bracket fastening bolt projecting upward,
The bracket fastening bolt is inserted from below into a hole formed in the first mounting portion, and the bracket fastening nut is tightened from above the first mounting portion to the bracket fastening bolt. The mounting structure of a seat cushion airbag device according to any one of claims 1 to 4, wherein the bracket is mounted to the rear floor panel at the first mounting portion.