JP2011194936A - Side airbag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a side airbag device decreasing manufacturing cost and mass.SOLUTION: In an airbag 20 of the side airbag device 100, the lower end side of an upper chamber base cloth 26 and the upper end side of a lower chamber base cloth 28 are overlapped each other and sewed together, whereas an inflator insertion opening 38 is formed by disposing a non-sewing part 37 at a portion of an inside overlapping section 30 which is opposed to a seat back frame. This allows an inflator 22 to be inserted into the airbag 20 through the inflator insertion opening 38 when manufacturing the side airbag device 100. Additionally, the inflator 22 is fixed to the seat back frame with the non-sewing part 37 held between a body section 22A disposed in the airbag 20 and the seat back frame. This prevents or suppresses gas leakage from the inflator insertion opening 38 omitting a filler cloth for preventing the gas leakage.

Description

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

  In the airbag device disclosed in Patent Document 1 below, the gas generator insertion port formed in the bag body of the airbag is covered with a patch provided inside the bag body. A gas generator insertion port is formed in the patch cloth at a position shifted from the gas generator insertion port of the bag body. These gas generator insertion openings are closed by pressing the application cloth against the inner surface of the bag body by the pressure of the gas when the gas generator is activated. Thereby, the gas leakage through each gas generator insertion port is prevented.

JP-A-9-175302

  However, the airbag apparatus as described above has room for improvement because the manufacturing cost and mass of the apparatus increase due to the need for the above-described application cloth (seal cloth, etc.).

  The present invention has been made in consideration of the above facts, and an object of the present invention is to obtain a side airbag device capable of reducing manufacturing cost and mass.

  In the side airbag device according to the first aspect of the present invention, the lower end side of the upper chamber base fabric and the upper end side of the lower chamber base fabric are overlapped and sewn, and the inside includes a plurality of chambers including the upper chamber and the lower chamber And has a communicating portion that communicates with the plurality of chambers, and is installed in a side portion of a seat back of a vehicle seat in a folded state, and the overlapping portion An air bag in which a gas generator insertion port is provided by providing a non-sewn portion at a portion facing the side frame portion of the seat back frame, and a main body portion is disposed in the airbag, and the side frame portion And a gas generator that is fixed to the side frame portion with the non-sewn portion sandwiched therebetween, and that inflates and deploys the airbag by generating gas when activated.

  In the side airbag device according to claim 1, the interior of the airbag sewn by the upper chamber base fabric and the lower chamber base fabric is partitioned into a plurality of chambers including the upper chamber and the lower chamber. The plurality of chambers are communicated with each other by a provided communication portion. When the gas generator generates gas, the gas is supplied to the plurality of chambers, and the airbag is inflated and deployed.

  Here, in the above-described airbag, the lower end side of the upper chamber base fabric and the upper end side of the lower chamber base fabric are overlapped and sewn, but facing the side frame portion of the seat back frame in the overlapping portion. The gas generator insertion port is formed by providing a non-sewn portion at the site to be operated. Thereby, at the time of manufacture of this side airbag apparatus, a gas generator can be inserted in an airbag via the said gas generator insertion port. Moreover, the gas generator is fixed to the side frame portion with the non-sewn portion sandwiched between the main body portion and the side frame portion arranged in the airbag. Thereby, since the gas leak from the said non-sewing part (namely, gas generator insertion port) can be prevented or suppressed, the application cloth for gas leak prevention can be abbreviate | omitted. Therefore, the manufacturing cost and mass of the device can be reduced.

  A side airbag device according to a second aspect of the present invention is the side airbag device according to the first aspect, wherein the gas generator projects from the main body portion to the side frame portion side, and the main body portion is It has a pair of upper and lower stud bolts for fastening to the side frame portion, and the non-sewn portion is arranged between the pair of upper and lower stud bolts.

  In the side airbag device according to claim 2, the upper chamber base fabric and the lower chamber base fabric are overlapped between a pair of upper and lower stud bolts for fastening the main body portion of the gas generator to the side frame portion. Since the provided non-sewn portion is arranged, when the vertical tension is applied to the upper chamber base fabric and the lower chamber base fabric by the inflation and deployment of the airbag, the non-sewn portion (that is, the gas generator insertion port) Can be prevented or suppressed. Thereby, the gas leak from a gas generator insertion port can be prevented or suppressed still more favorably.

  The side airbag device according to a third aspect of the present invention is the side airbag device according to the second aspect, wherein the lower stud bolt of the pair of upper and lower stud bolts includes the upper chamber base fabric and the lower airbag. It is characterized by penetrating through holes formed in each of the upper chamber base fabric and the lower chamber base fabric in the overlapping portion with the chamber base fabric.

  In the side airbag device according to claim 3, the stud bolt on the lower side of the gas generator is provided on each of the upper chamber base fabric and the lower chamber base fabric in the overlapping portion of the upper chamber base fabric and the lower chamber base fabric. It penetrates the formed through hole. As a result, the vertical displacement in the overlapping portion of the upper chamber base fabric and the lower chamber base fabric is regulated by the lower stud bolt, so that the non-sewn portion (gas generator) caused by the contact positional displacement The expansion of the (insertion slot) can be prevented by the lower stud bolt. Therefore, the gas leakage from the gas generator insertion port can be prevented or suppressed even better.

  As described above, in the side airbag device according to the first aspect of the present invention, the manufacturing cost and mass can be reduced.

  In the side airbag device according to the second aspect of the present invention, the gas generator insertion port can be prevented or suppressed from spreading when the airbag is inflated and deployed, and gas leakage from the gas generator insertion port is further improved. Can be prevented or suppressed.

  In the side airbag device according to the third aspect of the present invention, gas leakage from the gas generator insertion port can be further prevented or suppressed.

1 is a schematic side view showing a configuration of a main part of a vehicle seat on which a side airbag device according to a first embodiment is mounted. It is a schematic side view showing the side airbag device concerning a 1st embodiment in the state seen from the seat back frame side. It is an expanded sectional view which shows the cut surface along the 3-3 line of FIG. It is an expanded sectional view which shows the cut surface along line 4-4 of FIG. FIG. 5 is an enlarged cross-sectional view showing a cut surface along line 5-5 in FIG. 2. It is an expanded sectional view showing the state where the inflator insertion slot provided in the airbag which is the component of the side airbag device concerning a 1st embodiment was expanded. It is an expanded sectional view corresponding to Drawing 5 showing the state where the cylindrical part provided in the airbag concerning a 1st embodiment was crushed with the internal pressure of a waist part chamber. It is a schematic side view which shows the side airbag apparatus which concerns on 2nd Embodiment in the state seen from the seat back frame side. It is an expanded sectional view which shows the cut surface along the 9-9 line of FIG. It is an expanded sectional view which shows the cut surface along the 10-10 line of FIG. It is an expanded sectional view corresponding to Drawing 10 showing the state where the cylindrical part provided in the airbag concerning a 2nd embodiment was crushed with the internal pressure of the waist part chamber. It is a schematic side view which shows the side airbag apparatus which concerns on a reference example in the state seen from the seat back frame side. It is an expanded sectional view which shows the cut surface along line 13-13 of FIG. It is an expanded sectional view which shows the cut surface along the 14-14 line | wire of FIG.

<First Embodiment>
Hereinafter, the side airbag device 100 according to the first embodiment of the present invention will be described with reference to FIGS. An arrow FR appropriately shown in each drawing indicates the front side of the vehicle seat 15 on which the side airbag device 100 is mounted, an arrow UP indicates an upper side of the vehicle seat 15, and an arrow IN indicates the vehicle. The inner side of the sheet 15 in the width direction is shown.

  FIG. 1 is a schematic side view showing the configuration of the main part of the vehicle seat 15 on which the side airbag device 100 is mounted. As shown in this figure, a vehicle seat 15 includes a seat cushion 16 on which an occupant 14 is seated, and a seat back that is supported at a rear end portion of the seat cushion 16 so as to be tiltable and used as a backrest of a seated occupant 17. 18. In the present embodiment, the front direction, the upper direction, and the width direction of the vehicle seat 15 substantially coincide with the front direction, the upper direction, and the width direction of the vehicle.

  A side airbag device 100 is disposed inside a door side portion 18A (side portion on the side door not shown) of the seat back 18. The side airbag device 100 includes an airbag 20 that inflates and deploys in the front side and the vertical direction of the seat back 18 to protect the seated occupant 17, and an inflator 22 (gas generating means) that generates gas in the airbag 20. The air bag 20 is folded and modularized together with the inflator 22 (air bag module) is disposed on the side door side of the side frame portion 24A (see FIG. 5) of the seat back frame 24. ing. The seat back frame 24 is configured in a substantially inverted U shape with its lower part opened when viewed from the front side of the seat back 18, and side frame portions 24 </ b> A are arranged on both sides in the width direction. The side frame portion 24A is formed of a sheet metal material, and extends along the vertical direction of the seat back 18.

  1 to 5 and 7 show a state where the airbag 20 is inflated and deployed. Although illustration is omitted, a seat back pad (urethane pad) covered with a seat skin is disposed around the side airbag device 100, and the seat skin is inflated when the airbag 20 is inflated and deployed. The stitching portion and the seat back pad are configured to be cleaved.

  As shown in FIGS. 1 to 3, the airbag 20 includes an upper chamber base fabric 26 and a lower chamber base fabric 28. The upper chamber base cloth 26 is folded in two at a fold line 26A that is a front end in the inflated and deployed state of the airbag 20, and the outer cloth 26B disposed on the side door (not shown) and the outer cloth 26B. An inner cloth 26 </ b> C is integrally provided on the inner side in the seat width direction (the seat back frame 24 side). The outer cloth 26B and the inner cloth 26C are stitched along the substantially front-rear direction of the airbag 20 at the stitched portion S2 at the front side of the lower end. Protruding pieces 26D and 26E projecting downward are provided on the rear side of the lower end portions of the outer cloth 26B and the inner cloth 26C, and these projecting pieces 26D and 26E have an airbag at the stitched portion S2 at the front end. 20 are sewn along substantially the vertical direction.

  On the other hand, the lower chamber base fabric 28, like the upper chamber base fabric 26, is folded in two at a fold 28A that is the front end portion in the inflated and deployed state of the airbag 20, and is disposed on the side door side (not shown). The cloth 28B and an inner cloth 28C disposed on the inner side in the seat width direction (the seat back frame 24 side) with respect to the outer cloth 28B are integrally provided. As shown in FIG. 3, between the upper end side of the outer fabric 28B and the upper end side of the inner fabric 28C, the lower end side of the upper chamber base fabric 26 (the lower end side of the outer fabric 26B and the lower end side of the inner fabric 26C). Is inserted, the lower end side of the outer cloth 26B is superimposed on the inner side in the sheet width direction with respect to the upper end side of the outer cloth 28B, and the lower end side of the inner cloth 26C is superimposed on the outer side in the sheet width direction with respect to the upper end side of the inner cloth 28C. Has been. Hereinafter, a portion where the outer cloth 26B and the outer cloth 28B are overlapped is referred to as an “outer overlapping portion 29”, and a portion where the inner cloth 26C and the inner cloth 28C are overlapped is referred to as an “inner overlapping portion 30”. The outer overlapping portion 29 and the inner overlapping portion 30 are stitched along substantially the front-rear direction of the airbag 20 at the stitching portion S1.

  Further, as shown in FIGS. 1 and 2, the upper chamber base fabric 26 and the lower chamber base fabric 28 are stitched at the stitched portion S3 at the peripheral edge except for the folds 26A and 28A. Is sewn in a closed bag shape. The interior of the airbag 20 is partitioned vertically at the stitching portion S2, and the upper side of the stitching portion S2 is a chest chamber 32 (upper chamber) that restrains the chest of the seated occupant 17, and the lower side of the stitching portion S2 Is a waist chamber 34 (lower chamber) that restrains the waist of the seated occupant 17. Further, the front end portions of the projecting pieces 26D and 26E are sewn along the substantially vertical direction of the airbag 20 at the stitching portion S2, and the rear end portions of the projecting pieces 26D and 26E are substantially sewn up and down of the airbag 20 at the stitching portion S3. By being sewn along the direction, a cylindrical portion 36 having an axial direction in the vertical direction of the airbag 20 is disposed at the rear portion of the airbag 20. The tubular portion 36 is disposed so as to protrude into the waist chamber 34, and the chest chamber 32 and the waist chamber 34 are communicated with each other via the inside of the tubular portion 36. When the airbag 20 having the above-described configuration is sewn, the upper chamber base cloth 26 and the lower chamber base cloth 28 are sewn in the order of the stitching portion S1, the stitching portion S2, and the stitching portion S3.

  Here, in the airbag 20 described above, as shown in FIG. 2, a part on the rear side of the inner overlapping portion 30 of the inner cloth 26 </ b> C and the inner cloth 28 </ b> D, that is, the side frame portion 24 </ b> A of the seatback frame 24. A non-sewn portion 37 (a portion not stitched by the stitched portion S1; see FIG. 5) is provided at the portion facing the. As a result, the airbag 20 is formed with an inflator insertion port 38 (gas generator insertion port) communicating with the inside and outside of the airbag 20 at a portion facing the side frame portion 24A. Is manufactured, the inflator 22 is inserted into the airbag 20 through the inflator insertion port 38 (see FIG. 6).

  The inflator 22 includes a main body portion 22A formed in a long cylindrical shape. The main body portion 22 </ b> A is disposed at the rear end portion in the airbag 20 with the axial direction along the vertical direction of the seat back 18. The main body portion 22 </ b> A is disposed so as to straddle the non-sewn portion 37 in the vertical direction of the seat back 18, and the lower side is accommodated inside the cylindrical portion 36.

  As shown in FIG. 5, a pair of upper and lower stud bolts 22 </ b> B and 22 </ b> C projecting to the side frame portion 24 </ b> A side (radially outward of the main body portion 22 </ b> A) are provided on the outer peripheral portion of the main body portion 22 </ b> A. The non-sewn portion 37 is disposed between the stud bolts 22B and 22C. The upper stud bolt 22B protrudes inward in the seat width direction of the side frame portion 24A through the through hole 40 formed in the inner cloth 26C and the through hole 42 formed in the side frame portion 24A. A nut 44 is screwed into the portion. Further, the lower stud bolt 22C passes through the through hole 46 formed in the inner cloth 26C, the through hole 48 formed in the inner cloth 28C, and the through hole 50 formed in the side frame portion 24A. The portion 24A protrudes inward in the sheet width direction, and a nut 52 is screwed into the protruding portion. Accordingly, the main body portion 22A is fixed to the side frame portion 24A in a state where the non-sewn portion 37 is sandwiched (clamped) between the main body portion 22A and the side frame portion 24A of the inflator 22, The airbag 20 is attached to the side frame portion 24A by the main body portion 22A.

  The width dimension of the inflator insertion port 38 is set longer than the dimension obtained by adding the length dimension of the stud bolt 22B (or the stud bolt 22C) to the diameter of the main body portion 22A of the inflator 22, and the inflator insertion port 38 is Thus, the inflator 22 can be easily inserted into the airbag 72.

  A gas ejection part 22 </ b> D in which a gas ejection port is formed is provided at the lower end of the main body part 22 </ b> A of the inflator 22. The gas ejected from the gas ejection part 22 </ b> D flows into the chest chamber 32 through the upper end opening of the cylindrical part 36 and into the waist chamber 34 through the lower end opening of the cylindrical part 36. (See arrow G in FIG. 5). Thereby, the airbag 20 is inflated and deployed in the front side and the vertical direction of the seat back 18. Specifically, the chest chamber 32 is inflated and deployed between the chest of the seated occupant 17 and the side door, and the waist chamber 34 is inflated and deployed between the waist of the seated occupant 17 and the side door.

Note that the volume of the gas ejected from the inflator 22 is set to a volume that can sufficiently inflate and deploy each of the chest chamber 32 and the waist chamber 34. In addition, the cylindrical portion 36 is preferentially supplied to the waist chamber 34. Thereby, the internal pressure (gas pressure) of the waist chamber 34 is configured to be higher than the internal pressure (gas pressure) of the chest chamber 32.
(Operation and effect of this embodiment)
Next, the operation and effect of the first embodiment will be described.

  When the vehicle has a side collision, a side collision state is detected by an airbag sensor (not shown), and the signal is input to the airbag ECU. The airbag ECU determines whether or not the side airbag device 100 should be operated based on the input signal. If it is determined that the airbag is activated, a predetermined current is supplied to the inflator 22. As a result, the inflator 22 is activated and gas is ejected to the inside of the cylindrical portion 36.

  When gas is ejected to the inside of the tubular portion 36, the tubular portion 36 functions as a diffuser, and gas is distributed to the chest chamber 32 and the waist chamber 34 of the airbag 20. In this case, the cylindrical portion 36 preferentially supplies gas to the lumbar chamber 34, whereby the lumbar chamber 34 is inflated and deployed between the lumbar portion of the seated occupant 17 and the side door at an early stage, and the chest chamber 32 is expanded to the lumbar chamber. Slightly after 34, the seat expands and deploys between the chest of the seated occupant 17 and the side door.

  When the internal pressure of the lumbar chamber 34 becomes higher than a predetermined value, as shown in FIG. 7, the cylindrical portion 36 protruding into the lumbar chamber 34 is crushed by the internal pressure of the lumbar chamber 34 (the cylindrical portion 36 is Functions as a check valve). As a result, the outflow of gas from the waist chamber 34 to the chest chamber 32 side is prevented, and the internal pressure of the waist chamber 34 is kept higher than the internal pressure of the chest chamber 32.

  As a result, the waist of the seated occupant 17 that is more resistant than the chest of the seated occupant 17 is well restrained by the lumbar chamber 34, and the chest of the seated occupant 17 is prevented from being compressed more than necessary by the chest chamber 32. The

  Here, in the side airbag device 100, the airbag 20 is configured such that the lower end side of the inner fabric 26 </ b> C of the upper chamber base fabric 26 and the upper end side of the inner fabric 28 </ b> C of the lower chamber base fabric 28 are overlapped at the inner overlapping portion 30. However, a non-sewn portion 37 is provided at a portion of the inner overlapping portion 30 that faces the side frame portion 24A of the seat back frame 24. Thereby, since the inflator insertion port 38 is formed in the part facing the side frame portion 24 </ b> A in the airbag 20, the airbag 20 is connected via the inflator insertion port 38 when the side airbag device 100 is manufactured. The inflator 22 can be inserted inside. Moreover, the inflator 22 is fixed to the side frame portion 24A with the non-sewn portion 37 (that is, the inflator insertion port 38) sandwiched between the main body portion 22A and the side frame portion 24A disposed in the airbag 20. Yes. Thereby, since the gas leak from the inflator insertion port 38 is prevented or suppressed, the application cloth for gas leak prevention can be abbreviate | omitted. Therefore, the manufacturing cost and mass of the device can be reduced.

  Further, in the side airbag device 100, the non-sewn portion 37 is disposed between the pair of upper and lower stud bolts 22B and 22C of the inflator 22, so that the body portion 22A and the side frame portion 24A of the inflator 22 are disposed. The non-sewn portion 37 is firmly held, and the non-sewn portion 37 is prevented from spreading. Further, since the inner overlapping portion 30 is firmly sandwiched between the main body portion 22A and the side frame portion 24A of the inflator 22, the lower end side of the inner cloth 26C and the upper end side of the inner cloth 28C are relatively moved in the vertical direction. When trying to do so, a large frictional force acts between them. Therefore, since the relative movement (positional deviation) is regulated by this frictional force, the non-sewn portion 37 is prevented from spreading due to the abutting position deviation. Therefore, the non-sewn portion 37 (that is, the inflator insertion port 38) is prevented from spreading when vertical tension is applied to the upper chamber base fabric 26 and the lower chamber base fabric 28 by the inflation and deployment of the airbag 20. Thereby, the gas leak from the inflator insertion port 38 is prevented more satisfactorily.

  In addition, in the side airbag device 100, the stud bolt 22C on the lower side of the inflator 22 has a through hole 46 formed in the inner cloth 26C and a through hole 48 formed in the inner cloth 28C in the inner overlapping portion 30. It penetrates. As a result, the vertical displacement in the inner overlap portion 30 between the inner cloth 26C and the inner cloth 28C is also regulated by the stud bolt 22C, so that the non-sewn portion 37 is further spread due to the contact position deviation. To be blocked. Therefore, the gas leak from the inflator insertion port 38 is prevented even better.

  Moreover, in this side airbag apparatus 100, since the cylindrical part 36 (diffuser and check valve) is formed by sewing the lower end side of the upper chamber base fabric 26, the increase in a number of parts and mass is suppressed. be able to.

In the first embodiment, the gas ejected from the inflator 22 is rectified by the cylindrical portion 36, so that the internal pressure of the waist chamber 34 (lower chamber) is higher than the internal pressure of the chest chamber 32 (upper chamber). However, the invention according to claim 1 is not limited to this, and the internal pressures of the plurality of chambers can be appropriately changed. This also applies to the second embodiment of the present invention described below.
<Second Embodiment>
Next, a second embodiment of the present invention will be described with reference to FIGS. In addition, about the structure and effect | action similar to the said 1st Embodiment, the same code | symbol as the said 1st Embodiment is provided, and the description is abbreviate | omitted.

  FIG. 8 shows a schematic side view of the side airbag device 200 according to the second embodiment viewed from the side of the seat back frame 24 (not shown in FIG. 8). The side airbag device 200 has basically the same configuration as the side airbag device 100 according to the first embodiment, but the configuration of the airbag 52 is the same as that of the airbag 20 according to the first embodiment. Is different. 8 to 11 show the state in which the airbag 52 is inflated and deployed.

  The airbag 52 has basically the same configuration as that of the airbag 20 according to the first embodiment. In the airbag 52, the upper end side of the lower chamber base fabric 28 is sewn, so that The interior of the bag 52 is partitioned into a chest chamber 32 and a waist chamber 34, and a cylindrical portion 54 is provided at the rear of the airbag 52 with the vertical direction of the airbag 52 as the axial direction. Specifically, as shown in FIGS. 8 and 9, the outer fabric 28 </ b> B and the inner fabric 28 </ b> C constituting the lower chamber base fabric 28 are substantially in the front-rear direction of the airbag 52 in the stitching portion S <b> 2 at the front side on the upper end side. The airbag 52 is divided into a chest chamber 32 and a waist chamber 34. In addition, projecting pieces 28D and 28E that are folded back toward the waist chamber 34 are provided on the rear side of the upper ends of the outer cloth 28B and the inner cloth 28C. These projecting pieces 28D and 28E are stitched along the substantially vertical direction of the airbag 52 at the stitching portion S2 and the rear end portions are stitched along the substantially vertical direction of the airbag at the stitching portion S3. ing. Thereby, the cylindrical part 54 is provided in the rear part side in the airbag 52, and the chest chamber 32 and the waist | lumbar part chamber 34 are connecting via the inner side of the said cylindrical part 54. FIG.

  In the airbag 52, the upper end side and the inner side of the outer cloth 28B constituting the lower chamber base cloth 28 are disposed between the lower end side of the outer cloth 26B constituting the upper chamber base cloth 26 and the lower end side of the inner cloth 26C. The upper end side of the cloth 28C is inserted, the lower end side of the outer cloth 26B is superimposed on the outer side in the sheet width direction with respect to the upper end side of the outer cloth 28B, and the lower end side of the inner cloth 26C is overlapped with the upper end side of the inner cloth 28C. It is superimposed on the inner side in the sheet width direction. Hereinafter, a portion where the outer cloth 26B and the outer cloth 28B are overlapped is referred to as an “outer overlapping portion 56”, and a portion where the inner cloth 26C and the inner cloth 28C are overlapped is referred to as an “inner overlapping portion 58”.

  The outer overlapping portion 56 and the inner overlapping portion 58 are stitched along the substantially front-rear direction of the airbag 52 at the stitching portion S1, but as shown in FIG. A non-sewn portion 60 (a portion not stitched by the stitched portion S1; see FIG. 10) is provided in a part of the seatback frame 24, that is, the portion facing the side frame portion 24A of the seat back frame 24. As a result, the airbag 52 has an inflator insertion port 62 (gas generator insertion port) communicating with the inside and outside of the airbag 52 at a portion facing the side frame portion 24A. Is manufactured, the inflator 22 is inserted into the airbag 52 through the inflator insertion port 62.

  The main body portion 22 </ b> A of the inflator 22 is disposed so as to straddle the non-sewn portion 60 in the vertical direction of the seat back 18, and the lower side is housed inside the cylindrical portion 54. The stud bolt 22B on the upper side of the inflator 22 passes through the through hole 40 formed in the inner cloth 26C and the through hole 42 formed in the side frame portion 24A and protrudes inward in the seat width direction of the side frame portion 24A. The nut 44 is screwed into the protruding portion. Further, the stud bolt 22C on the lower side of the inflator 22 penetrates the through hole 64 formed in the protruding piece 28E, the through hole 48 formed in the inner cloth 28C, and the through hole 50 formed in the side frame portion 24A. The side frame portion 24A protrudes inward in the seat width direction, and a nut 52 is screwed into the protruding portion. Thereby, the main body portion 22A is fixed to the side frame portion 24A in a state in which the non-sewn portion 60 is sandwiched (clamped) between the main body portion 22A and the side frame portion 24A of the inflator 22. The airbag 20 is attached to the side frame portion 24A by the main body portion 22A. When the above-described airbag 52 is sewn, the upper chamber base fabric 26 and the lower chamber base fabric 28 are sewn in the order of the stitched portion S1, the stitched portion S2, and the stitched portion S3.

  Also in the side airbag device 200 having the above-described configuration, the seat back frame 24 in the inner overlapping portion 58 between the lower end side of the inner cloth 26C of the upper chamber base cloth 26 and the upper end side of the inner cloth 28C of the lower chamber base cloth 28 is also provided. An inflator insertion port 62 is formed by providing a non-sewn portion 60 at a portion facing the side frame portion 24A. Therefore, the inflator 22 can be inserted into the airbag 20 through the inflator insertion port 62 when the side airbag device 200 is manufactured. Moreover, the inflator 22 is fixed to the side frame portion 24A in a state where the non-sewn portion 60 is sandwiched between the main body portion 22A and the side frame portion 24A disposed in the airbag 20. Thereby, since the gas leakage from the inflator insertion port 62 is prevented or suppressed, the application cloth for preventing gas leakage can be omitted. Therefore, the manufacturing cost and mass of the apparatus can be reduced, and the same effects as those of the first embodiment can be obtained.

  In each of the above embodiments, the non-sewn parts 37 and 60 are arranged between the pair of upper and lower stud bolts 22B and 22C of the inflator 22, but the invention according to claim 1 is not limited to this, and the air The non-sewn portion of the bag may be provided at a position sandwiched between the main body portion and the side frame portion of the gas generator.

  In each of the above embodiments, the airbags 20 and 52 are configured to include the cylindrical portions 36 and 54. However, the invention according to claim 1 is not limited thereto, and the cylindrical portions 36 and 54 are omitted. A configuration may be used.

  In each of the above embodiments, the cylindrical portions 36 and 54 are arranged so as to protrude toward the waist chamber 34 (lower chamber). However, the invention according to claim 1 is not limited thereto, and the cylindrical portion is not limited thereto. The arrangement of 36 and 54 can be changed as appropriate.

  Further, in each of the above embodiments, the airbags 20 and 52 are configured to include the chest chamber 32 (upper chamber) and the waist chamber 34 (lower chamber), but the invention according to claim 1 is not limited thereto. The airbag may have a chamber other than the upper and lower chambers.

In addition, the present invention can be implemented with various modifications without departing from the scope of the invention. Needless to say, the scope of rights of the present invention is not limited to the above embodiments.
<Reference example>
Next, a reference example of the present invention will be described with reference to FIGS. In addition, about the structure and effect | action similar to the said 1st Embodiment, the same code | symbol as the said 1st Embodiment is provided, and the description is abbreviate | omitted.

  FIG. 12 shows a schematic side view of a side airbag device 300 according to a reference example of the present invention viewed from the side of the seat back frame 24 (not shown in FIG. 12). The side airbag device 300 includes an airbag 72 different from the airbag 20 according to the first embodiment. The airbag 72 includes a base cloth 74 and a pair of reinforcing cloths 76 and 78 stitched to the base cloth 74 (bag inner cloth, see FIG. 13).

  The base cloth 74 is folded in two at a fold line 74A that is the front end in the inflated and deployed state of the airbag 72, and an outer cloth 74B disposed on the side door (not shown) and a seat width with respect to the outer cloth 74B. An inner cloth 74 </ b> C disposed on the inner side in the direction (the seat back frame 24 side) is integrally provided. The outer cloth 74B and the inner cloth 74C are sewn at the stitching portion S3 at the peripheral edge except for the fold line 74A, whereby the airbag 72 is sewn into a closed bag shape.

  On the other hand, as shown in FIG. 13, the pair of reinforcing cloths 76 and 78 are arranged side by side in the sheet width direction between the rear part of the outer cloth 74B and the rear part of the inner cloth 74C. The ends are sewn to the upper and lower ends and the rear end of the outer cloth 74B and the inner cloth 74C at the stitching portion S3. The reinforcing cloth 76 disposed on the outer cloth 74B side is overlapped with the rear part of the outer cloth 74B, and the front end of the reinforcing cloth 76 is close to the rear side of the middle part in the front-rear direction of the outer cloth 74B at the stitching part S1. Sutured along the direction. The reinforcing cloth 78 arranged on the inner cloth 74C side is overlapped with the rear part of the inner cloth 74C, and the front end of the airbag 72 is closer to the rear side in the front-rear direction intermediate part of the inner cloth 74C at the stitching part S2. It is stitched along the up-and-down direction. Accordingly, the rear portions of the outer cloth 74B and the inner cloth 74C are reinforced by the pair of reinforcing cloths 76 and 78. When the airbag 72 is sewn, the base cloth 74 and the reinforcing cloths 76 and 78 are in the order of the stitching portion S1 → the stitching portion S2 → the stitching portion S3, or the stitching portion S2 → the stitching portion S1 → the stitching portion S3. Sewed in order.

  Here, in the airbag 72, an inflator insertion port 80 (gas generator insertion port) is formed in an intermediate portion in the vertical direction of the rear portion of the inner cloth 74C. In addition, an inflator insertion port 82 (gas generator insertion port) is formed above the inflator insertion port 80 at an intermediate portion in the vertical direction of the reinforcing fabric 78 superimposed on the rear portion of the inner fabric 74C. These inflator insertion ports 80 and 82 are formed in a slit shape along the front-rear direction of the airbag 72, and are arranged so as to be shifted in the vertical direction of the airbag 72 as shown in FIG. In FIG. 14, the inflator 22 and the side frame portion 24A are not shown for convenience of explanation).

  The width dimension of the inflator insertion ports 80 and 82 (the length dimension along the longitudinal direction of the airbag 72) is obtained by adding the length dimension of the stud bolt 22B (or the stud bolt 22C) to the diameter of the main body portion 22A of the inflator 22. The inflator 22 is set to be longer than the size, and the inflator 22 can be inserted from the outside to the inside of the airbag 72 through the inflator insertion ports 80 and 82.

  The inflator 22 inserted into the airbag 72 is formed in the through hole 84 formed in the reinforcing cloth 78 above the inflator insertion port 82, the through hole 86 formed in the inner cloth 74C, and the side frame portion 24A. The upper stud bolt 22B is inserted into the through hole 42 (see FIG. 5), and a nut 44 (see FIG. 5) is screwed into the stud bolt 22B. Further, the stud bolt 22C on the lower side of the inflator 22 is formed in the through hole 88 formed in the reinforcing cloth 78, the through hole 90 formed in the inner cloth 74C, and the side frame portion 24A below the inflator insertion port 80. The through hole 50 (see FIG. 5) is inserted, and a nut 52 (see FIG. 5) is screwed into the stud bolt 22C. Thus, the main body portion 22A is fixed to the side frame portion 24A in a state in which the reinforcing cloth 78 and the inner cloth 74C are sandwiched (clamped) between the main body portion 22A of the inflator 22 and the side frame portion 24A. The airbag 72 is attached to the side frame portion 24A by the main body portion 22A.

  In the side airbag device 300 configured as described above, the inflator 22 can be inserted into the airbag 72 through the inflator insertion ports 80 and 82 during manufacture. In addition, since the inflator 22 is fixed to the side frame portion 24A, the reinforcing cloth 78 and the inner cloth 74C are sandwiched between the main body portion 22A of the inflator 22 and the side frame portion 24A. The insertion port 80 can be closed and the inflator insertion port 82 can be closed by the inner cloth 74C. Thereby, the gas leak from the inflator insertion port 38 can be prevented.

  Further, in the side airbag device 300, since the inflator insertion ports 80 and 82 are disposed between the pair of upper and lower stud bolts 22B and 22C of the inflator 22, the main body portion 22A and the side frame portion 24A of the inflator 22 The inner cloth 74C and the reinforcing cloth 78 are firmly sandwiched between the inner cloth 74C and the separation of the inner cloth 74C and the reinforcing cloth 78 is prevented. Further, when the inner cloth 74C and the reinforcing cloth 78 are about to be displaced in the vertical direction, a large frictional force acts between them, and the displacement is regulated by this frictional force. Therefore, when the tension in the vertical direction acts on the inner cloth 74C and the reinforcing cloth 78 due to the inflation and deployment of the airbag 72, the inflator insertion ports 80 and 82 can be prevented from spreading. Thereby, the gas leak from the inflator insertion ports 80 and 82 can be prevented even better.

  Moreover, in the side airbag device 300, the stud bolt 22B of the inflator 22 passes through the through hole 84 formed in the reinforcing cloth 78 and the through hole 86 formed in the inner cloth 74C, and the stud bolt 22C is It penetrates through a through hole 88 formed in the reinforcing cloth 78 and a through hole 90 formed in the inner cloth 74C. As a result, the vertical displacement between the inner cloth 26C and the reinforcing cloth 78 is also regulated by the stud bolts 22B and 22C, so that the spread of the inflator insertion ports 80 and 82 due to the abutting position deviation is further prevented. Is done. Therefore, the gas leak from the inflator insertion port 38 is prevented even better.

  Further, in the side airbag device 300, the inflator insertion port 82 formed in the reinforcing cloth 78 is disposed away from the gas ejection part 22D of the inflator 22 and thus is ejected from the gas ejection part 22D. It is possible to suppress the gas from being directly ejected to the inflator insertion port 82. Further, since the longitudinal direction of the inflator insertion ports 80 and 82 is set in a direction orthogonal to the axial direction (longitudinal direction) of the main body portion 22A of the inflator 22, the main body portion 22A makes the inflator insertion ports 82 and 80 favorable. Can be closed. Thereby, the gas leak from the inflator insertion ports 80 and 82 can be prevented satisfactorily.

DESCRIPTION OF SYMBOLS 100 Side airbag apparatus 15 Vehicle seat 17 Seated occupant 18 Seat back 18A Side part 20 Air bag 22 Inflator 22A Main part 22B Stud bolt 22C Stud bolt 24 Seat back frame 24A Side frame part 26 Upper chamber base cloth 28 Lower chamber base cloth 29 Outer overlapping portion 30 Inner overlapping portion 32 Chest chamber (upper chamber)
34 Lumbar chamber (lower chamber)
36 cylindrical portion 37 non-sewn portion 38 inflator insertion port 200 side airbag device 52 airbag 54 cylindrical portion 56 outer overlapping portion 58 inner overlapping portion 60 non-sutured portion 62 inflator insertion port

Claims (3)

The lower end side of the upper chamber base fabric and the upper end side of the lower chamber base fabric are overlapped and sewn, and the interior is sewn into a bag shape partitioned into a plurality of chambers including the upper chamber and the lower chamber, A communication portion that communicates with the chamber, and is installed in a side portion of the seat back of the vehicle seat in a folded state, and is not provided in a portion of the overlapping portion that faces the side frame portion of the seat back frame. An airbag provided with a gas generator insertion port by providing a stitching portion; and
A main body is disposed in the airbag, and is fixed to the side frame portion with the non-sewn portion sandwiched between the airbag and the side frame portion. A gas generator for expanding and deploying
Side airbag device provided with.   The gas generator has a pair of upper and lower stud bolts that project from the main body portion toward the side frame portion and fasten the main body portion to the side frame portion, and the non-sewn portion includes the pair of upper and lower portions. The side airbag device according to claim 1, wherein the side airbag device is disposed between the stud bolts.   The lower stud bolt of the pair of upper and lower stud bolts is a through hole formed in each of the upper chamber base fabric and the lower chamber base fabric at the overlapping portion of the upper chamber base fabric and the lower chamber base fabric. The side airbag device according to claim 2, wherein the side airbag device penetrates the hole.

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