JP2007145194A - Side airbag device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress a protrusion of the side part of a backrest part incorporating a side airbag device. <P>SOLUTION: A circumferential shaped recessed forming part 221 is formed so as to recess obliquely backward on a mounting plate part 22 of an opened cross section shaped part 20 composing a side frame 16. A holder 25 is jointly fixed to the inner surface (the surface at the opposite side of a side door 10) of the mounting plate part 22. A circumferential shaped recessed forming part 251 is formed on the holder 25. A sealed storage chamber 28 is formed between the recessed forming part 221 of the mounting plate part 22 side and the recessed forming part 251 of the holder 25 side. An inflator 29 is stored in the storage chamber 28. A folded part 303 of the airbag 30 is disposed corresponding to the outer surface (flat surface part 211) of the flat plate part 21 of the opened cross section shaped part 20 and the outer surface 224 of the mounting plate part 22. A plurality of gas passage holes 223 are formed so as to communicate to the storage chamber 28 on the peripheral wall of the recessed forming part 221 of the mounting plate part 22 side. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a side airbag device in a vehicle in which a side airbag device including an airbag having a folded portion that is inflated and deployed by gas generated from a gas generation source is incorporated in a seat backrest portion.

  This type of side airbag device is disclosed in Patent Documents 1 and 2, for example. The airbag in the side airbag device disclosed in Patent Literatures 1 and 2 is inflated and deployed on the side of the chest of the occupant and the side of the head. That is, this side airbag device protects the occupant's chest and head against a collision at the side of the vehicle body.

  The side airbag device disclosed in Patent Document 1 is located on the inner side (vehicle body side) of a frame (seat back frame) extending from the lower end side of the backrest portion to the upper end side along the side portion of the seat backrest portion (seat back). The vehicle is located on the opposite side of the vehicle compartment side) and on the front side.

In Patent Document 2, a retainer having a half-cylindrical shape is fixed to a side panel frame (a part of a seat back frame), and the side airbag device includes an inflator whose retainer is fixed to the side panel frame. Is housed in.
JP-A-10-24795 JP-A-10-181510

  In the arrangement configuration of the side airbag device disclosed in Patent Document 1, in order to prevent the presence of the side airbag device even if the backrest portion is touched from the outside, a cushion material (for example, urethane foam resin) constituting the backrest portion It is desirable to increase the thickness of the side portion. When a part of the side airbag device protrudes to the front side from the frame (seat back frame) extending from the lower end side of the backrest portion to the upper end side along the side portion of the backrest portion, the side portion of the backrest portion The cushion material protrudes too far forward. Therefore, in order to improve the comfort when the back is deposited on the backrest, it is necessary to increase the width of the backrest or increase the thickness of the backrest to match the thickness of the side.

  If the side airbag device is placed so that it does not go too far forward from the frame (seat back frame) that extends from the lower end of the backrest to the upper end along the side of the backrest, the side of the backrest moves forward It is possible to avoid overhanging. However, if the side airbag device is lowered too far backward than the frame (seat back frame), the cushion material on the side portion of the backrest portion protrudes rearward and the design of the side portion of the backrest portion is deteriorated. When there is a seat behind the backrest, the protrusion of the cushioning material to the rear narrows the space near the feet of the passenger seated on the rear seat.

  When the side airbag device is arranged on the outer side (side of the vehicle body (side door, etc.) side) than the frame (seat back frame) extending from the lower end side of the backrest portion to the upper end side along the side portion of the backrest portion The cushion material on the side of the backrest also protrudes to the side. To ensure rapid inflation and deployment of the airbag, it is necessary to widen the space between the side of the vehicle body (side door, etc.) and the backrest as much as it protrudes to the side. There are some restrictions.

That is, the protrusion of the side of the backrest to the side, the protrusion to the front, and the protrusion to the rear are design constraints of the backrest.
Also in the airbag device disclosed in Patent Document 2, since the side panel frame projects largely to the front side of the other pipe-shaped seat back frame, the side portion of the backrest portion protrudes forward, and the side portion of the backrest portion The design property of becomes worse.

  The first object of the present invention is to achieve both improvement in the design of the backrest part incorporating the side airbag device, the mountability of the side airbag device, and the deployment performance. A second object of the present invention is to prevent leakage of gas generated from a gas generation source.

  According to the present invention, a side airbag device including an airbag having a folded portion that is inflated and deployed by gas generated from a gas generation source has a backrest on a side close to a side portion of a vehicle body among side portions of a seat backrest portion. In the invention, the backrest portion extends from the lower end side of the backrest portion to the upper end side along the side portion of the backrest portion. A gas having a side frame, wherein the gas generation source is disposed on a side opposite to the side portion of the vehicle body with respect to the side frame, and sends gas generated from the gas generation source to the folding portion. A passage hole is provided in the side frame.

  A configuration in which a gas generation source is disposed on the side frame opposite to the side portion of the vehicle body and a gas passage hole for sending gas generated from the gas generation source to the folding portion is provided in the side frame. Compared to the conventional configuration in which both the gas generation source and the folding portion are arranged on the vehicle inner side or the vehicle outer side than the side frame, the protrusion of the side portion of the backrest portion can be suppressed.

In a preferred example, the folded portion of the airbag and the gas generation source are arranged so as to sandwich the side frame therebetween.
To sandwich the side frame means that there is a side frame between at least a part of the folded portion and at least a part of the gas generation source. The configuration in which the folding portion is disposed at a position closer to the side portion of the vehicle body than the gas generation source reduces the protrusion to the side portion side and the front side of the vehicle body.

In a preferred example, the side frame has an open cross-sectional shape portion having an open cross-sectional shape and a cross-sectional shape, and the gas passage hole is provided in the open cross-sectional shape portion.
The configuration in which the gas passage hole is formed in the open cross-sectional shape portion of the side frame is advantageous in simplifying the support structure for supporting the gas generation source in the side frame.

  In a preferred example, the side frame has an open cross-sectional shape part having an open cross-sectional shape, and a holder is fixed to the open cross-sectional shape part. A sealed storage chamber is formed therebetween, the gas generation source is stored in the storage chamber, and the gas passage hole is provided in the open cross-sectional shape portion facing the storage chamber. The gas generated from the gas generation source is jetted into the storage chamber, and the gas in the storage chamber passes through the gas passage hole and is sent to the folding portion.

The configuration in which the gas generation source is stored in the storage chamber formed between the holder and the open cross-sectional shape portion is simple as a support structure for supporting the gas generation source in the side frame.
In a preferred example, the airbag is hermetically connected to the open cross-sectional shape portion in a state where the airbag and the gas passage hole communicate with each other.

The configuration in which the airbag is connected to the open cross-sectional shape portion in a sealed state is effective in preventing leakage of gas generated from the gas generation source.
In a preferred example, the folding portion is located closer to the side of the vehicle body than the gas generation source.

  The configuration in which the folding part is arranged closer to the side of the vehicle body than the gas generation source is compared to the conventional configuration in which both the gas generation source and the folding part are arranged on the side of the vehicle body from the side frame. The protrusion of the side part of the backrest part can be suppressed.

  The present invention has an excellent function of being able to suppress the protrusion of the side part of the backrest part incorporating the side airbag device.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In the following description, the front-rear direction is the forward / backward direction of the vehicle, the forward direction is the forward direction of the vehicle, and the rear direction is the reverse direction of the vehicle. The right side is the right side when viewed in the forward direction of the vehicle, and the left side is the left side when viewed in the forward direction of the vehicle. The terms “upper” and “lower” related to the vehicle refer to the upper and lower sides in the vertical direction when viewed in the forward direction of the vehicle.

  As shown in FIGS. 1A and 1B, a seat 11 in a vehicle includes a seat portion 12 and a backrest portion 13 disposed on the rear end side of the seat portion 12 so as to be adjustable in inclination. The metal frame 14 that is the core of the backrest 13 of the seat 11 includes a left side frame 16 that extends from the lower end side to the upper end side of the backrest 13 and a right side that extends from the lower end side to the upper end side of the backrest portion 13. It has a frame 17 and a horizontal frame 18 connecting the upper ends of both side frames 16, 17, and a headrest 19 is supported on the horizontal frame 18 so that the height position can be adjusted.

  As shown in FIG. 2A, the frame 14 is covered with a cushioning material 15 (for example, made of urethane foam resin), and the surface of the cushioning material 15 is covered with an outer skin 151. The epidermis 151 has a stitched portion 153 at the side edge of the backrest portion 13, and a cut 152 is formed inside the cushion material 15 so as to face the stitched portion 153.

  The side frame 16 includes an open cross-sectional shape portion 20 having an open cross-sectional shape (a non-cylindrical cross-sectional shape). The open cross-sectional shape portion 20 includes a flat plate portion 21 having a flat portion 211 facing the side door 10 side, and a plate-shaped mounting plate portion 22 adjacent to the flat plate portion 21 and facing obliquely rearward. Yes. Further, the open cross-sectional shape portion 20 is provided on the mounting plate portion 22 so as to be substantially orthogonal to the mounting plate portion 22 and the reinforcing piece 23 for reinforcement connected to the flat plate portion 21 so as to be substantially orthogonal to the flat plate portion 21. And a reinforcing piece 24 for reinforcement.

  As shown in FIG. 2B, a circumferential dent forming portion 221 is formed on the mounting plate portion 22 of the open cross-sectional shape portion 20 so as to dent obliquely rearward. A holder 25 is bonded and fixed to the inner surface of the mounting plate portion 22 (the surface on the side opposite to the side door 10). The holder 25 has a flat plate-shaped joint portion 253, and a circumferential recess formation portion 251 is formed in the joint portion 253. The joint portion 253 of the holder 25 is joined and fixed to the inner surface of the mounting plate portion 22 by tightening a plurality of pairs of bolts 26A and 26B and nuts 27A and 27B. The joint portion 253 of the holder 25 and the mounting plate portion 22 are joined in a state where the space between them is sealed.

  As shown in FIG. 4, a sealed storage chamber 28 is formed between the peripheral wall 222 of the recess forming portion 221 on the mounting plate portion 22 side and the peripheral wall 252 of the recess forming portion 251 on the holder 25 side. An inflator 29 as a gas generation source is stored in the storage chamber 28. The inflator 29 includes a cylindrical portion 291 filled with high-pressure gas and a gas discharge portion 292 having a cylindrical cross-sectional shape smaller in diameter than the cylindrical portion 291, and a plurality of ejection holes 293 are formed on the peripheral surface of the gas discharge portion 292. ing. The high-pressure gas in the cylinder portion 291 flows into the gas discharge portion 292 by breaking the partition between the cylinder portion 291 and the gas discharge portion 292, and the gas flowing into the gas discharge portion 292 passes through the ejection holes 293. Then, it flows into the storage chamber 28.

  A plurality of gas passage holes 223 are formed in the peripheral wall 222 of the recess forming part 221 on the mounting plate part 22 side so as to communicate with the storage chamber 28. The gas in the storage chamber 28 flows out of the storage chamber 28 through the gas passage hole 223.

  As shown in FIG. 2B, the airbag 30 is attached to the outer surface 224 (surface on the side door 10 side) side of the mounting plate portion 22 excluding the recess forming portion 221. The airbag 30 is formed by folding a piece of cloth and sewing the surroundings together. One of the folded cloth portions is referred to as a cloth portion 301, and the other is referred to as a cloth portion 302. The cloth part 301 is sandwiched between the head part 261 of the bolt 26 </ b> A and the mounting plate part 22 on the outer surface 224 side of the mounting plate part 22 together with the annular presser 31. The cloth portion 302 is sandwiched between the head portion 261 of the bolt 26 </ b> B and the mounting plate portion 22 on the outer surface side of the mounting plate portion 22 together with the annular pressing member 31. The annular pressing member 31 presses the cloth portions 301 and 302 against the mounting plate portion 22 so as to surround the dent forming portion 221 on the open sectional shape portion 20 side, and is attached to the outer surface 224 side of the mounting plate portion 22. The interior of the airbag 30 is sealed. That is, the airbag 30 is connected to the open cross-sectional shape portion 20 (side frame 16) in a sealed state in a state where the inside of the airbag 30 and the gas passage hole 223 are communicated with each other.

  The airbag 30 has a foldable portion 303 that can be folded and inflated. The folding portion 303 is disposed so as to face the flat portion 211 of the flat plate portion 21 and the outer surface 224 of the mounting plate portion 22. That is, the folding part 303 and the inflator 29 of the airbag 30 are arranged so as to sandwich the side frame 16 that is a part of the frame 14, and the folding part 303 is closer to the side door 10 of the vehicle than the inflator 29. Close to the location. That is, the folding part 303 and the inflator 29 are separated from each other so as to place the side frame 16 therebetween as viewed from above the vehicle.

  The inflator 29 and the airbag 30 constitute a side airbag device built in the side portion of the backrest portion 13 on the side close to the side portion of the vehicle body. The vehicle body is provided with an impact sensor (for example, an acceleration detector) (not shown). The impact sensor sends information on impact applied to the vehicle (acceleration information in the case of an acceleration detector) to control means (not shown). When the impact detected by the impact sensor is greater than or equal to a predetermined magnitude, the control means operates the inflator 29 as a gas generation source. That is, when the impact detected by the impact sensor is an impact greater than or equal to a predetermined magnitude, the high-pressure gas in the cylinder portion 291 flows out to the gas discharge portion 292. The gas flowing out to the gas discharge part 292 flows into the folding part 303 via the ejection hole 293, the storage chamber 28 and the gas passage hole 223, and the folding part 303 is expanded and developed by the gas pressure. The front end side of the inflating folding part 303 breaks the cushion material 15 and the stitching part 153 between the notch 152 and the stitching part 153 and protrudes to the outside of the backrest part 13, and the airbag 30 is an occupant seated on the seat ( (Not shown) and inflated and deployed between the side door 10 of the vehicle. The deployed airbag 30 protects the occupant's upper body from side collisions.

In the first embodiment, the following effects can be obtained.
(1) In the conventional case where both the inflator 29 and the folding part 303 are arranged on the side door 10 side with respect to the side frame 16, the extending direction of the folding part 303 at the time of inflating and deploying is forward or the side door 10. Since it is necessary to face the front side obliquely toward the front, the protrusion of the side portion of the backrest 13 toward the front, rear, or side door 10 side becomes large. In the conventional case where both the inflator 29 and the folding part 303 are disposed on the vehicle inner side (the side opposite to the side door 10) than the side frame 16, the extending direction of the folding part 303 is set to the front or side. Since it is necessary to face obliquely forward near the door 10, the protrusion of the side part of the backrest part 13 forward or rearward becomes large.

  In the present embodiment, the inflator 29 is disposed on the side opposite to the side door 10 (side part of the vehicle body) with respect to the side frame 16, and gas for sending gas generated from the inflator 29 to the folding part 303. A passage hole 223 is provided in the open cross-sectional shape portion 20 that is a part of the side frame 16. The configuration in which only the inflator 29 is on the vehicle inner side (the side opposite to the side door 10 side) than the side frame 16 is compared to the configuration in which the folding portion 303 and the inflator 29 are both on the vehicle inner side than the side frame 16. Reduce the protrusion to the rear.

  In the configuration in which the gas passage hole 223 is provided in the open cross-sectional shape portion 20, the supply path of the gas generated from the inflator 29 located on the vehicle inner side than the side frame 16 is a path that penetrates the side frame 16. The gas supply path that penetrates the side frame 16 makes it possible to arrange the folding part 303 on the front side of the side frame 16, the side side of the side frame 16, the rear side of the side frame 16, or the like. In this embodiment, the folding part 303 is arrange | positioned at the side side (side door 10 side) of the side frame 16. FIG.

  That is, the configuration in which the inflator 29 is disposed on the side frame 16 opposite to the side door 10, and the gas passage hole 223 for sending the gas generated from the inflator 29 to the folding portion 303 is provided in the side frame 16. It is effective in suppressing the protrusion of the side part of the backrest part 13 incorporating the side airbag device. That is, the configuration in which the inflator 29 is disposed on the side frame 16 on the opposite side of the side door 10 and the gas passage hole 223 is provided in the side frame 16 is the design of the backrest portion 13 incorporating the side airbag device. This is effective in achieving both improvement, mountability and deployment performance of the side airbag device.

  (2) In the present embodiment, the folded portion 303 of the airbag 30 and the inflator 29 are disposed so as to sandwich the side frame 16 therebetween, and the folded portion 303 is located on the side door 10 (of the vehicle body) rather than the inflator 29. It is in a position close to the side). The configuration in which only the folding portion 303 is on the side door 10 side with respect to the side frame 16 is compared with the configuration in which both the folding portion 303 and the inflator 29 are on the side door 10 side with respect to the side frame 16 (left side). Side) and front protrusion.

  (3) The holder 25 for housing and supporting the inflator 29 is attached to the open sectional shape portion 20, and the gas passage hole 223 is provided in the open sectional shape portion 20 of the side frame 16. The configuration in which the gas passage hole 223 is formed in the open cross-sectional shape portion 20 of the side frame 16 is advantageous in simplifying the support structure for supporting the inflator 29 by the side frame 16.

  (4) The configuration in which the inflator 29 is stored in the storage chamber 28 formed between the holder 25 and the open cross-sectional shape portion 20 is simple as a support structure for supporting the inflator 29 by the side frame 16.

  (5) The folding portion 303 is disposed corresponding to the flat portion 211 of the flat plate portion 21 and the outer surface 224 of the mounting plate portion 22. That is, the airbag 30 can be folded at a width corresponding to the entire width of the open cross-sectional shape portion 20. Therefore, the folding thickness of the folding portion 303 (indicated by T in FIG. 2B) can be reduced, and the protrusion to the side door 10 side (left side) or the oblique rear side is reduced.

  (6) The flat surface portion 211 and the outer surface 224 function as surfaces (parts) for obtaining a reaction force against the gas pressure when the folding portion 303 is inflated and deployed. That is, the folding part 303 can be rapidly inflated and deployed by a reaction force from the flat part 211 and the outer surface 224 against the gas pressure. In addition, the initial extending direction of the folding part 303 at the time of inflating and unfolding is a direction perpendicular to the plane part 211 (direction indicated by the arrow Q1 in FIG. 2A) and a direction perpendicular to the plane part of the outer surface 224 [FIG. 2 (a) in the direction indicated by the arrow Q2].

  Since the initial extending direction of the folding unit 303 greatly affects the subsequent extending path of the folding unit 303, it is desirable to set the initial extending direction of the folding unit 303 appropriately. That is, an inclination angle with respect to the front-rear direction R in the direction Q1 perpendicular to the plane part 211 (indicated by θ1 in FIG. 2A), and an inclination angle with respect to the front-rear direction R in the direction Q2 perpendicular to the plane part of the outer surface 224 [FIG. By appropriately selecting [indicated by θ2 in (a)], the unfolding direction of the folding part 303 (the direction in which the folding part 303 extends) can be suitably set.

  (7) The inside of the storage chamber 28 is sealed, and the airbag 30 opens in a state where the inside of the airbag 30 and the gas passage hole 223 are communicated with each other, and is sealed with respect to the cross-sectional shape portion 20 (side frame 16). It is connected. That is, the air bag 30 and the storage chamber 28 communicate with each other only through the gas passage hole 223, and the gas generated from the inflator 29 does not leak out of the air bag 30. A configuration in which the airbag 30 is connected to the open cross-sectional shape portion 20 in a sealed state is effective in preventing leakage of gas generated from the inflator 29.

Next, a second embodiment shown in FIGS. 5A, 5B, and 5C will be described. The same reference numerals are used for the same components as those in the first embodiment.
As shown in FIG. 5A, the side frame 16A has an open cross-sectional shape portion 20A having an open cross-sectional shape (non-cylindrical cross-sectional shape). The opening cross-sectional shape portion 20A is attached to the holding plate portion 32 facing the side door 10 (see FIG. 1B) and to one side of the holding plate portion 32 so as to be substantially orthogonal to the holding plate portion 32. A plate portion 33 and a mounting plate portion 34 connected to the other side of the holding plate portion 32 so as to be substantially orthogonal to the holding plate portion 32 are provided. The mounting plate portion 33 and the mounting plate portion 34 face each other.

  As shown in FIG. 5B, a circumferential dent forming portion 321 is formed on the holding plate portion 32 of the open cross-sectional shape portion 20A so as to dent toward the left. A holder 35 is bonded and fixed to the opposing surfaces of the mounting plate portion 33 and the mounting plate portion 34. The holder 35 includes a holding plate portion 351, a joint portion 352 that is connected to one side of the holding plate portion 32 so as to be substantially orthogonal to the holding plate portion 32, and a holding plate that is substantially orthogonal to the holding plate portion 32. It has the junction part 353 which continues on the other side of the part 32, and the circumference-shaped dent formation part 354 which was recessedly formed in the holding plate part 351. The joining portion 352 of the holder 35 is joined and fixed to the inner surface of the mounting plate portion 33 of the opening cross-sectional shape portion 20A by tightening the bolt 26A and the nut 27A. The joint portion 353 of the holder 35 is joined and fixed to the inner surface of the mounting plate portion 34 of the opening cross-sectional shape portion 20A by tightening the bolt 26B and the nut 27B.

  As shown in FIG. 5 (c), a sealed storage chamber 36 is formed between the peripheral wall 322 of the recess forming portion 321 on the open sectional shape portion 20A side and the peripheral wall 355 of the recess forming portion 354 on the holder 35 side. An inflator 29 is stored in the storage chamber 36. A plurality of gas passage holes 323 are formed in the peripheral wall 322 of the recess forming portion 321 on the side of the open sectional shape portion 20 </ b> A so as to communicate with the storage chamber 36. The gas generated from the inflator 29 flows into the storage chamber 36 through the ejection holes 293, and the gas in the storage chamber 36 flows out of the storage chamber 36 through the gas passage holes 323.

  As shown in FIG. 5B, a plate mounting tool 37 is fastened and fixed to the outer surface of the open section 20A by bolts 26A and 26B. An annular flange 371 is formed on the mounting tool 37. The flange 371 surrounds the dent forming part 321 on the opening cross-sectional shape part 20 </ b> A side, and the ends of the cloth parts 301 and 302 of the airbag 30 are in close contact with the flange 371. The inside of the airbag 30 in close contact with the flange 371 is in a sealed state, and the gas in the storage chamber 36 flows into the airbag 30 through the gas passage hole 323.

  The folding part 303 of the airbag 30 is disposed so as to face the outer surface of the holding plate part 32 on the side of the open sectional shape part 20A. That is, the folding part 303 and the inflator 29 of the airbag 30 are arranged so as to sandwich the side frame 16 </ b> A that is a part of the frame 14.

Also in the second embodiment, the same effect as in the first embodiment can be obtained. Further, the use of the mounting tool 37 facilitates sealing of the airbag 30.
In addition, in 2nd Embodiment, the site | part of the holding plate part 32 except the dent formation part 321 by the side of the open cross-section shape part 20A, and the site | part of the holding plate part 351 except the dent formation part 354 by the side of the holder 35 are included. A gap S as shown in FIGS. 5B and 5C may be formed between them. In such a case, the gas passage hole 323 may be formed in a portion of the holding plate portion 32 on the side of the open cross-sectional shape portion 20A facing the gap S.

Next, a third embodiment shown in FIGS. 6A and 6B will be described. The same reference numerals are used for the same components as those in the first embodiment.
As shown in FIG. 6A, the side frame 16B has a closed cross-sectional shape portion 38 having a closed cross-sectional shape (cylinder cross-sectional shape). The closed cross-sectional shape portion 38 has a rectangular tube shape, and an inflator 29 is attached to a flat plate portion 39 facing the side opposite to the side door 10 (see FIG. 1B) in the closed cross-sectional shape portion 38. A screw portion 294 is formed on the outer periphery of the gas discharge portion 292 of the inflator 29. The inflator 29 is fixed to the flat plate portion 39 by screwing the screw portion 294 into a screw hole 391 provided in the flat plate portion 39.

  As shown in FIG. 6 (b), a pair of sealing plugs 40 and 41 are fitted into the cylinder of the closed cross-sectional shape portion 38. The pair of sealing plugs 40 and 41 forms a sealed chamber 381 in the cylinder of the closed cross-sectional shape portion 38. The gas generated from the inflator 29 flows into the sealed chamber 381 via the ejection hole 293.

  A plurality of gas passage holes 421 are formed in the flat plate portion 42 facing forward in the closed cross-sectional shape portion 38 so as to communicate with the sealed chamber 381. The ends of the fabric portions 301 and 302 of the airbag 30 are in close contact with the outer surface of the closed cross-sectional shape portion 38. The inside of the airbag 30 that is in close contact with the outer surface of the closed cross-sectional shape portion 38 is in a sealed state, and the inside of the sealed airbag 30 communicates with the gas passage hole 421.

  The folded portion 303 of the airbag 30 is disposed corresponding to the flat portion 422 of the flat plate portion 42. The gas in the sealed chamber 381 flows into the airbag 30 through the gas passage hole 323, and the folding portion 303 is inflated and deployed toward the front.

In the third embodiment, the same effect as the item (1) in the first embodiment can be obtained.
The folding part 303 is arrange | positioned corresponding to the plane part 422 of the flat plate part 42 which is a part of the side frame 16B. The flat surface portion 422 functions as a surface (part) that obtains a reaction force against the gas pressure when the folding portion 303 is inflated and deployed. That is, the folding part 303 can be rapidly inflated and deployed by a reaction force from the plane part 422 against the gas pressure, and the initial extension direction of the folding part 303 at the time of inflation and deployment is a direction perpendicular to the plane part 422 [ In the direction indicated by the arrow Q3 in FIG. If the inclination angle (indicated by θ3 in FIG. 6A) of the direction Q3 perpendicular to the plane part 422 with respect to the front-rear direction R is appropriately selected, the unfolding direction of the folding part 303 (the direction in which the folding part 303 extends) is suitable. Can be set to

In the present invention, the following embodiments are also possible.
In the first embodiment, the folding part 303 may be disposed only at a position corresponding to the flat part 211 of the flat plate part 21.

  In the first embodiment, the open cross-sectional shape portion 20 and another open cross-sectional shape portion are joined to form a side frame, and the open cross-sectional shape portion 20 is sealed between the open cross-sectional shape portion 20 and another open cross-sectional shape portion. A storage chamber may be formed and the inflator 29 may be stored in the storage chamber. The open cross-sectional shape portion 20 and another open cross-sectional shape portion constitute a side frame having a closed cross-sectional shape and a cross-sectional shape.

  In the second embodiment, the open cross-sectional shape portion 20A and another open cross-sectional shape portion are joined to form a side frame, and the open cross-sectional shape portion 20A and another open cross-sectional shape portion are sealed. A storage chamber may be formed and the inflator 29 may be stored in the storage chamber. The open cross-sectional shape portion 20A and another open cross-sectional shape portion constitute a side frame having a closed cross-sectional shape and a cross-sectional shape.

The technical idea that can be grasped from the embodiment described above will be described below.
[1] The side frame has a closed cross-sectional shape portion having a closed cross-sectional shape, the closed cross-sectional shape portion has a sealed chamber in a cylinder, and the gas passage hole is formed in the sealed chamber. Provided in the closed cross-sectional shape portion so as to communicate with each other, the gas generated from the gas generation source is ejected to the sealed chamber, and the gas in the sealed chamber passes through the gas passage hole and is folded. The side airbag device in the vehicle according to claim 1, wherein the side airbag device is sent to the vehicle.

  The protrusion of the side part of the backrest part which incorporates a side airbag apparatus can be suppressed.

A 1st embodiment is shown and (a) is a side view. (B) is a front view. (C) is a partial expanded sectional view. (A) is the sectional view on the AA line of FIG.1 (c). (B) is a partial expanded sectional view. Partial rear view. FIG. 3 is a cross-sectional view taken along line BB in FIG. A 2nd embodiment is shown and (a) is a partial plane sectional view. (B) is a partial expanded sectional view. FIG. 5C is a cross-sectional view taken along line CC of FIG. A 4th embodiment is shown and (a) is a partial plane sectional view. (B) is the DD sectional view taken on the line of Fig.6 (a).

Explanation of symbols

  10: A side door which is a side part of the vehicle body. 11 ... sheet. 13 ... Backrest part. 16, 16A, 16B ... side frame. 20, 20A ... Open sectional shape part. 223, 323, 421 ... gas passage holes. 25, 35 ... Holder. 28, 36 ... Storage room. 29: An inflator as a gas generation source. 30 ... Airbag. 303 ... Folding part. R: Front-back direction.

Claims (6)

The side part of the backrest part on the side close to the side part of the vehicle body among the side parts of the backrest part of the seat is the side airbag device provided with the airbag having the folded part that is inflated and deployed by the gas generated from the gas generation source. In the side airbag device in the vehicle built in,
The backrest portion has a side frame extending from the lower end side of the backrest portion to the upper end side along the side portion of the backrest portion, and the gas generation source is opposite to the side portion of the vehicle body with respect to the side frame. A side airbag device in a vehicle, wherein the side frame is provided with a gas passage hole that is disposed on a side and for sending a gas generated from the gas generation source to the folding portion.   The side airbag device for a vehicle according to claim 1, wherein the folded portion of the airbag and the gas generation source are disposed so as to sandwich the side frame therebetween.   3. The side frame according to claim 1, wherein the side frame has an open cross-sectional shape portion having an open cross-sectional shape, and the gas passage hole is provided in the open cross-sectional shape portion. The side airbag apparatus in the described vehicle.   A holder is fixed to the open cross-sectional shape portion, a sealed storage chamber is formed between the holder and the open cross-sectional shape portion, and the gas generation source is stored in the storage chamber. The gas passage hole is provided in the open cross-sectional shape portion facing the storage chamber, the gas generated from the gas generation source is jetted into the storage chamber, and the gas in the storage chamber is The side airbag device in the vehicle according to claim 3, wherein the side airbag device is sent to the folding portion through the gas passage hole.   The side airbag device for a vehicle according to claim 4, wherein the airbag is connected to the open cross-sectional shape portion in a sealed state in a state where the airbag and the gas passage hole are communicated with each other.   The side airbag device for a vehicle according to any one of claims 1 to 5, wherein the folding portion is located closer to a side portion of the vehicle body than the gas generation source.

Images