JP5036519B2 - Seat for vehicle with built-in side airbag device - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a vehicle seat with a built-in side airbag device, and particularly relates to a vehicle seat with a built-in side airbag device in which a side airbag is inflated and deployed forward from a side portion of a seat back.

2. Description of the Related Art Conventionally, a side airbag device built-in vehicle seat in which a side airbag is inflated and deployed forward from a side portion of a seat back is disclosed (Patent Document 1). In this technology, a deployment stabilizing plate that is swingable about a rotation axis is provided on the side front end side of the seat back frame, and this deployment stabilizing plate is more than the side airbag of the vehicle side airbag device. It is located on the vehicle front side and extends in the vehicle front-rear direction. Further, a stopper is disposed at a position adjacent to the deployment stabilizing plate so that the deployment stabilizing plate can endure when subjected to the bag inflation pressure of the side airbag. Therefore, before the side airbag is inflated and the skin of the seat back is cleaved, it is possible to restrict the side airbag from inflating to the inside of the seat by the deployment stabilizing plate. In addition, since the deployment stabilization plate can swing around the rotation axis, the deployment stabilization plate swings around the rotation axis even if a load is applied from the center side of the seat back to the side by the seat occupant. The sheet reaction force does not cause a sense of incongruity.
JP 2006-137398 A

  However, in the above-described prior art, the development stabilizing plate is supported so as to be swingable around a rotation axis extending in the vertical direction with respect to the front edge of the outer surface of the seat back frame. For this reason, it is necessary to firmly attach the deployment stabilizing plate to the seat back frame in consideration of the inflation pressure of the airbag that becomes a high pressure. As a result, the number of parts increases, resulting in an increase in cost and weight.

  In consideration of the above facts, the present invention can expand and deploy a side airbag in a normal deployment direction without increasing the number of parts, and also has a side airbag device built-in vehicle that hardly affects the seat reaction force. The purpose is to obtain a sheet.

The vehicle seat with a built-in side airbag device according to the first aspect of the present invention includes an airbag that is built in a side portion of a seat back and inflates and expands forward from the side portion of the seat back, and the inflation of the airbag. The seat exterior member provided with a breaking portion that is broken by pressure, the seat back frame, and the airbag are disposed between the seat back frame and the airbag in the longitudinal direction of the seat. A plate portion that guides the direction to the direction of the breaking portion provided in front of the plate surface, and supports the frame to support a load that acts on the inner side in the seat width direction of the plate portion in the seat longitudinal direction. comprising a part, the seat rear side of the support portion is fixed to the outer wall of the frame, acts on the seat width direction outer side than the load acting on the seat width direction inside And easily guide plate deformed by heavy, and having a.

Therefore, when the airbag built in the side portion of the seat back is inflated and deployed forward in the seat back, the seat longitudinal direction in the guide plate disposed between the frame of the seat back and the airbag Due to the plate surface arranged along the direction of the air bag, the direction in which the airbag is deployed can be guided toward the broken portion of the sheet exterior member provided in front of the plate surface . For this reason, the deployment direction of the airbag is stable, and the fracture portion can be quickly broken by the inflation pressure of the airbag. On the other hand, the guide plate includes a support portion for supporting a load acting on the inside in the seat width direction on the frame at the middle portion in the seat longitudinal direction of the plate portion, and is fixed to the outer wall portion of the frame on the rear side of the seat from the support portion. Yes. Therefore, when the occupant seated on the seat moves relative to the seat outward in the seat width direction, the guide plate is deformed with respect to the load acting outward in the seat width direction rather than the load acting inward in the seat width direction. Therefore, the guide plate is easily deformed outward in the sheet width direction. As a result, the guide plate hardly affects the seat reaction force, and the seated occupant can be safely held. Further, since the guide plate is more easily deformed with respect to the load acting on the outer side in the sheet width direction than the load acting on the inner side in the sheet width direction , the above action can be obtained with a simple configuration without providing any special parts. is there.

According to a second aspect of the present invention, in the vehicle seat with a built-in side airbag device according to the first aspect , the guide plate has a bending rigidity inward in the seat width direction higher than a bending rigidity in the outer side in the seat width direction. It has the rigidity adjustment means to do.

  Therefore, by providing the rigidity adjusting means on the guide plate, the bending rigidity inward in the sheet width direction is made higher than the bending rigidity in the outer side in the sheet width direction, so that the configuration is simplified.

According to a third aspect of the present invention, in the vehicle seat with a built-in side airbag device according to the second aspect , the rigidity adjusting means is formed at a front end portion on the front side of the guide plate and faces outward in the seat width direction. It is characterized by being an inclined part inclined.

  Therefore, the rigidity adjusting means is formed at the front end portion of the guide plate and is an inclined portion that is inclined toward the front outside in the seat width direction, so that the configuration is simple.

According to a fourth aspect of the present invention, in the vehicle seat with a built-in side airbag device according to the second aspect , the rigidity adjusting means is formed at an intermediate portion in the front-rear direction of the guide plate and protrudes outward in the seat width direction. It is the bending part which becomes.

  Accordingly, the rigidity adjusting means is a bent portion that is formed in the middle portion in the front-rear direction of the guide plate and is convex outward in the seat width direction. For this reason, the configuration is simple and the guide plate is easily bent outward in the sheet width direction from the bent portion.

According to a fifth aspect of the present invention, in the vehicle seat with a built-in side airbag device according to the first aspect , the guide plate is formed at a front side portion thereof, and is prevented from being deformed to suppress deformation inward in the seat width direction. It has the means.

  Therefore, since the deformation suppressing means formed on the front side portion of the guide plate suppresses deformation inward in the seat width direction, the configuration is simple.

According to a sixth aspect of the present invention, in the vehicle seat with a built-in side airbag device according to the fifth aspect , the deformation suppressing means is configured to receive the load applied to the inner side in the seat width direction of the guide plate. It is a protrusion part which contact | abuts and suppresses a deformation | transformation to the sheet width direction inner side, It is characterized by the above-mentioned.

  Therefore, when the guide plate receives a load acting on the inner side in the sheet width direction, the projecting portion comes into contact with the frame, so that the load acting on the inner side of the guide plate in the sheet width direction can be received by the frame. For this reason, the structure is simple, and even if a large load acts on the inner side in the sheet width direction, deformation of the guide plate can be suppressed by the protruding portion.

According to the first to sixth aspects of the present invention , the side airbag can be inflated and deployed in the normal deployment direction with a simple configuration without increasing the number of parts, and the seat reaction force is hardly affected.

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

  FIG. 3 shows a schematic overall side view of a side airbag deployment state of the vehicle seat with a built-in side airbag device according to the present embodiment, and FIG. 4 shows a built-in side airbag device according to the present embodiment. A perspective view of a seat back frame of a vehicle seat is shown. 1 shows an enlarged cross-sectional view of the side airbag retracted state at the site along the 1-1 cross-sectional line in FIG. 3, and FIG. 2 shows the initial state of the side airbag deployment. A cross-sectional view corresponding to is shown.

  As shown in FIG. 3, a vehicle seat 10 as a vehicle seat with a built-in side airbag device includes a seat cushion 12 on which an occupant 19 is seated and a rear end portion of the seat cushion 12 that is tiltably supported. The seat back 14 is used as a backrest of the seat back, and the headrest 16 is supported by the upper end of the seat back 14 so as to be movable up and down and supports the head of the occupant 19.

  As shown in FIG. 1, the seat back 14 is provided integrally with a center portion 14A that is disposed in the center portion in the seat width direction and directly supports the back of the occupant, and an end portion on the outer side in the vehicle width direction of the center portion 14A. And a tunnel side (inner side) side portion (not shown) provided integrally with an end portion on the inner side in the vehicle width direction of the central portion 14A. Note that the door side portion 14B and the tunnel side portion both have a shape that protrudes toward the vehicle front side.

  As shown in FIG. 3, a side airbag device 20 is provided in the middle portion in the height direction of the door side portion 14 </ b> B in the seat back 14. The side airbag device 20 is configured to inflate and deploy the side airbag 18 stored in a folded state at the time of a side collision to the front side of the seat along the inside of the side door 17 (see FIG. 1).

  As shown in FIG. 4, a pair of left and right seat back frame side portions 22 having a substantially U-shaped cross section formed by press molding are provided at the lower portion of the seat back frame 21 constituting the skeleton of the seat back 14. It is arranged along the back height direction. In addition, a seat back frame upper portion 23 that is bent into a shape in which a lower portion is opened in front view by a pipe material is disposed on the upper portion of the seat back frame 21, and a pair of left and right lower end portions of the seat back frame upper portion 23 is disposed. 23A is connected to the upper ends of the pair of left and right seat back frame side portions 22, respectively.

  Note that the seat back frame 21 reduces the upper load compared to the lower load in order to suppress the moment at the time of the rear impact of the vehicle. As a result, the seat back frame side portion 22 gradually decreases in the front-rear width W from the lower side to the upper side, and the seat back frame upper portion 23 also has a small diameter corresponding to the front-rear width W 1 of the upper portion of the seat back frame side portion 22. It is made of pipe material.

  As shown in FIG. 1, the seat back frame side portion 22 has a flat plate-like base portion 22A extending along the seat front-rear direction and a front end of the base portion 22A toward the front in the seat width direction, which is the front in the vehicle width direction. A front side wall portion 22B bent toward the rear, and a rear side wall portion 22C bent toward the inner rear in the seat width direction, which is the inner side in the vehicle width direction, from the rear end of the base portion 22A. Further, a flange 22D is formed at the front end portion of the front side wall portion 22B toward the inner rear in the seat width direction, and a flange 22E is formed at the front end portion of the rear side wall portion 22C toward the inner front in the seat width direction. Has been.

  A side portion 24B is formed from the seat width direction central portion 24A of the seat back pad 24 as a seat exterior member toward the outer side in the seat width direction, and the side portion 24B of the seat back pad 24 is formed on the seat back frame side portion 22. A flat cross-sectional shape is formed in a substantially C shape around the outer side in the sheet width direction. The seat back pad 24 is made of urethane foam or the like having a predetermined hardness.

  Furthermore, the outer periphery of the seat back pad 24 is covered with a seat skin 26 as a seat exterior member. Further, the airbag 18 and the inflator 32 of the side airbag device 20 are built in (incorporated into) the side portion 24B of the seat back pad 24.

  The inflator 32 is actuated by a signal from an impact detection sensor (not shown) so that the airbag 18 is inflated and deployed.

  Further, a space portion 34 in which the side airbag device 20 is accommodated is formed in the side portion 24 </ b> B of the seat back pad 24. A breakage breakage promoting portion 34A is formed from the outer side of the space portion 34 in the seat width direction toward the front of the seat, and a front portion of the breakage promoting portion 34A is generated by the inflation pressure of the airbag 18. It becomes the fracture | rupture part (tier part) of the side part 24B of the pad 24. FIG.

  Further, the sheet skin 26 has a two-layer structure of a first layer 26A configured by a skin or the like and forming a design surface, and a second layer 26B configured by a foam material or the like. The seat cover 26 includes a front surface portion 36 (top plate), a front side portion 38 (top plate side) located at both ends of the front surface portion 36 in the sheet width direction, and a side surface portion 40 (kamachi) following both front surface side portions 38. And a rear surface portion (back surface portion) 41. Further, both edge portions 36A of the front surface portion 36 of the seat cover 26 and one edge portion 38A of the front side portion 38 are sewn together by a sewing line H1 with a sewing thread S1, and the front surface portion 36 and both front surface side portions 38 Thus, the seat skin on the backrest side of the seat back 14 is configured.

  On the other hand, on the other edge portion 38B of the front side portion 38 on the outer side in the sheet width direction of the seat cover 26, one edge portion 40A of the side surface portion 40 on the outer side in the sheet width direction has a burst line (a broken line) as a broken portion by the suture S2. Sewing line) Sewed at H2. Further, the other edge portion 40B of the side surface portion 40 of the seat cover 26 is stitched to the edge portion 41A of the rear surface portion 41 by a sewing line H3 with a sewing thread S3.

  In the seat skin 26 of the seat back 14 provided with the side airbag device 20, the sewing line H2 scheduled to be broken is generally called a burst line. Further, the front side portions 38 (top plate side) located on both sides of the front surface portion 36 (top plate) of the seat skin 26 also constitute the front surface of the seat skin 26. For this reason, the front part is a concept including the front side part (top plate side).

  The burst line H2 is provided at a position corresponding to the breakage promoting portion 34A of the seat back pad 24, and the burst line H2 uses a sewing thread that is easier to break than a sewing thread used for other sewing lines and a sewing thread having strength. Has been.

As shown in FIG. 3, between the upper portion of the base portion 22A of the seat back frame side portion 22 and the upper vicinity thereof in the door side side portion 14B of the seat back 14, and the upper portion of the side airbag device 20 and the upper vicinity thereof. Is provided with a reaction force plate 50 as a guide plate .

  As shown in FIG. 1, the side airbag device 20 includes a case 27 that constitutes an outline of the side airbag device 20, and the case 27 is attached to the reaction force plate 50 and the seat back frame side portion 22 by an attachment member (not shown). ing. However, the case 27 is not necessarily required for the side airbag device 20, and may be a caseless type. Moreover, the code | symbol 33 of FIG. 1 has shown the wire which comprises some seat backs.

  As shown in FIG. 4, the reaction force plate 50 is composed of a plate material including a plate portion whose plate surface is arranged along the front-rear direction of the seat. In the present embodiment, the entire reaction force plate 50 is a plate portion arranged with the plate surface along the front-rear direction of the seat. The reaction force plate 50 has a substantially rectangular shape with the vertical direction as the longitudinal direction, and is attached from the upper part of the seat back frame side part 22 to the lower end part 23A of the seat back frame upper part 23. Further, the front-rear width W2 of the reaction force plate 50 is set larger than the front-rear width W1 of the upper portion of the base portion 22A of the seat back frame side portion 22, and the front-rear width W2 of the reaction force plate 50 is equal to the seat back frame side portion. It is substantially equal to the front-rear width W3 of the lower part of the 22 base 22A.

  More specifically, in the reaction force plate 50, the rear half 50A is in contact with the outer wall portion which is the outer surface in the vehicle width direction (the outer surface in the seat width direction) of the base portion 22A of the seat back frame side portion 22. The rear end portion 50B of the force plate 50 is fixed to the rear end portion of the outer wall portion of the base portion 22A of the seat back frame side portion 22 by welding (fixing portion P1).

  The rear end portion 50B of the reaction force plate 50 may be adhered to the rear end portion of the outer wall portion of the base portion 22A of the seat back frame side portion 22 with an adhesive, or may be fixed by a fixing member such as a bolt. Also good.

  As shown in FIG. 1, the front portion 50 </ b> C of the reaction force plate 50 protrudes toward the front of the seat with respect to the base portion 22 </ b> A of the seat back frame side portion 22, and extends from the front side wall portion 22 </ b> B of the seat back frame side portion 22. It is separated. Further, the reaction force plate 50 has a predetermined rigidity ensured by the material (for example, metal such as iron or aluminum) and its plate thickness, and when the airbag 18 is inflated and deployed inside the seat, as shown in FIG. In addition, the load can be received without being deformed by a load inward in the seat width direction (in the direction of arrow B in FIG. 2) received from the inflating and deploying airbag 18. For this reason, the airbag 18 can be guide | induced to the direction of the burst line H2 (arrow A direction of FIG. 2) with the reaction force plate 50. FIG.

  In the lower portion of the seat back frame side portion 22 where the reaction force plate 50 is not provided, the front / rear width W3 of the lower portion of the seat back frame side portion 22 extends forward of the vehicle as compared to the upper front / rear width W1. . Therefore, the airbag 18 can be guided in the direction of the burst line H2 by the seat back frame side portion 22 instead of the reaction force plate 50.

  On the other hand, after the airbag 18 is inflated and deployed at the time of a side collision of the vehicle, the seat seat occupant 19 seated on the vehicle seat 10 is outside in the seat width direction with respect to the vehicle seat 10 (arrow in FIG. 1). In the case of relative movement in the (C direction), the reaction force plate 50 starts from the fixed portion P1 of the rear end portion 50B as a starting point due to the load from the seated occupant 19, and as shown by the two-dot chain line, It is easily deformed (plastic deformation or elastic deformation) to the outside in the sheet width direction (in the direction of arrow D in FIG. 1).

  That is, the reaction force plate 50 is deformed with respect to a load acting inward in the seat width direction, with the tip position (supporting portion P2) of the base portion 22A of the seat back frame side portion 22 as a base point, and acts outward in the seat width direction. With respect to the load, the fixing portion P1 of the rear end portion 50B of the reaction force plate 50 which is located behind the seat from the support portion P2 is deformed from the base point. For this reason, it is easier to be deformed with respect to the load acting on the outer side in the sheet width direction than the load acting on the inner side in the sheet width direction. As a result, the reaction force plate 50 can inflate and deploy the side airbag 18 in the normal deployment direction inside the seat and hardly affect the seat reaction force.

  As shown in FIG. 3, the side airbag 18 disposed on the vehicle front side of the inflator 32 is inflated and deployed over substantially the entire region in the vertical direction at the side portion of the seat back 14 on the outer side in the vehicle width direction. . For this reason, the side airbag 18 is a vertically long and large bag in a side view that inflates and deploys in the vertical direction to a position that restrains at least the range of the waist 19A to the chest 19B of the seated occupant 19.

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

  When the vehicle is in 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 vehicle side airbag device 20 should be operated based on the input signal, and if it is determined that the side airbag is activated, a predetermined current is supplied to the inflator 32. Thereby, the inflator 32 is operated to generate gas, and the gas is ejected from the gas ejection hole of the gas ejection portion. As a result, the side airbag 18 stored in the folded state in the door side portion 14B of the seat back 14 is inflated and deployed inside the seat, and tries to break the burst line H2 of the seat skin 26 together with the seat back pad 24. .

  Here, in the present embodiment, in the door side side portion 14B of the seat back 14, the upper portion of the base portion 22A of the seat back frame side portion 22 and its upper vicinity, and the upper portion of the side airbag device 20 and its upper vicinity. A reaction force plate 50 is provided between them. For this reason, in the upper part of the seat back frame side portion 22 and in the vicinity of the upper part thereof, the reaction force plate 50 can receive a load acting on the inner side in the seat width direction from the airbag 18 inflated and deployed inside the seat.

  That is, as shown by a two-dot chain line in FIG. 2, a part 18 </ b> A of the side airbag 18 at an initial stage (before the burst line H <b> 2 is broken) of the side airbag 18 by the reaction force plate 50. Can be prevented from entering the inside in the seat width direction (the direction of arrow B in FIG. 2) along the front side wall portion 22B of the seat back frame side portion 22. As a result, the side airbag 18 is guided by the reaction force plate 50 and inflated and deployed toward the front (arrow A direction side in FIG. 2), and the deployment direction of the airbag 18 is stabilized. For this reason, the seat back pad 24 and the burst line H2 of the seat skin 26 can be quickly broken by the inflation pressure of the airbag 18.

  The side airbag 18 that breaks the burst line H2 of the seat skin 26 and is inflated and deployed outside the seat is interposed between the seat seat occupant 19 and the side door 17, and protects the seat seat occupant 19. Further, when the side airbag 18 is deployed, the lower portion of the airbag 18 located closer to the gas ejection portion of the inflator 32 is inflated first, and then the upper portion is inflated.

  In addition, the reaction force plate 50 is deformed from the tip position (support portion P2) of the base portion 22A of the seat back frame side portion 22 with respect to the load acting on the inner side in the seat width direction, and acting on the outer side in the seat width direction. On the other hand, the fixed portion P1 of the rear end portion 50B of the reaction force plate 50 is deformed from the base point. For this reason, it is easier to be deformed with respect to the load acting on the outer side in the sheet width direction than the load acting on the inner side in the sheet width direction.

  Therefore, after the airbag 18 is inflated and deployed at the time of a side collision of the vehicle, the seat seat occupant 19 seated on the vehicle seat 10 is outside in the seat width direction with respect to the vehicle seat 10 (the arrow in FIG. 1). In the case of relative movement in the (C direction), the reaction force plate 50 starts from the fixed portion P1 of the rear end portion 50B as a starting point due to the load from the seated occupant 19, and as shown by the two-dot chain line, Easily deforms outward in the sheet width direction (in the direction of arrow D in FIG. 1). As a result, since the reaction force plate 50 hardly affects the seat reaction force, the seat seat occupant 19 can be safely held.

  In the present embodiment, the reaction force starts from the fixing portion P1 between the rear end portion 50B of the reaction force plate 50 and the base portion 22A of the seat back frame side portion 22 and the support portion P2 in front of the seat from the fixing portion P1. By adopting a configuration in which the plate 50 is deformed outward in the sheet width direction or inward in the sheet width direction, the reaction force plate 50 is easily deformed with respect to a load acting outward in the sheet width direction rather than a load acting inward in the sheet width direction. is doing. For this reason, it is not necessary to provide a special part for controlling the movement of the reaction force plate 50. As a result, according to the present embodiment, since the number of parts does not increase, disadvantages such as an increase in weight and an increase in cost do not occur.

  Note that the fixing portion P1 between the reaction force plate 50 and the base portion 22A of the seat back frame side portion 22 may be at another position as long as it is behind the support portion P2.

  Further, the reaction force plate 50 and the seat back frame side portion 22 may be separated from each other at a portion between the fixed portion P1 and the support portion P2.

  In addition, when the rear half portion 50A of the reaction force plate 50 and the outer side surface in the vehicle width direction of the base portion 22A of the seat back frame side portion 22 are separated from each other except the fixed portion P1, a load inward in the seat width direction is applied. In addition, the reaction force plate 50 and the base portion 22A of the seat back frame side portion 22 may be in contact with each other at the support portion P2.

  Hereinafter, the second embodiment of the vehicle seat with a built-in side airbag device according to the present invention will be described with reference to FIG. In addition, about the same component as 1st Embodiment mentioned above, the same number is attached | subjected and the description is abbreviate | omitted.

As shown in FIG. 5, in the second embodiment, an inclined portion as a stiffness adjusting means that inclines toward the front in the seat width direction and forward in the vehicle width direction at the front end portion of the reaction force plate 50 as the guide plate. 50D is formed.

  Therefore, in the present embodiment, in addition to the effects of the first embodiment, as shown by a two-dot chain line in FIG. 5, when the reaction force plate 50 is slightly deformed inward in the vehicle width direction when the airbag is deployed and inflated. In addition, the airbag 18 can be inflated and deployed in the direction of the sewing line H2 along the inclined portion 50D.

  On the other hand, when the seated occupant 19 moves relative to the vehicle seat 10 in the seat width direction outside (in the direction of arrow C in FIG. 5), the acting load is outside in the vehicle width direction along the inclined portion 50D (see FIG. 5 (in the direction of arrow E).

  Furthermore, in the present embodiment, since the inclined portion 50D that is bent toward the front in the vehicle width direction is formed at the front end portion of the reaction force plate 50, from the front of the vehicle body (in the direction of arrow F in FIG. 5) at the time of a vehicle frontal collision. Even when a load is applied, the load is applied to the inclined portion 50D of the reaction force plate 50, whereby the reaction force plate 50 is easily deformed toward the outer side in the seat width direction, which is the outer side in the vehicle width direction. As a result, since the reaction force plate 50 hardly affects the seat reaction force, the seat seat occupant 19 can be safely held. The inclined portion 50D may have a shape curved in an arc shape.

  Hereinafter, a third embodiment of the vehicle seat with a built-in side airbag device according to the present invention will be described with reference to FIG. In addition, about the same component as 1st, 2nd embodiment mentioned above, the same number is attached | subjected and the description is abbreviate | omitted.

As shown in FIG. 6, in the third embodiment, a portion serving as a middle portion in the front-rear direction of the reaction force plate 50 as a guide plate , that is, a rear end portion 50B in the rear half portion 50A (a base portion of the seat back frame side portion 22). A bent portion 50E as rigidity adjusting means is formed at a position in front of the fixing portion P1) to 22A. The bent portion 50E is a bent portion that protrudes outward in the seat width direction, which is the outer side in the vehicle width direction, and is bent in a U shape.

  Therefore, in this embodiment, in addition to the effects of the first and second embodiments, when the seat occupant 19 moves relative to the vehicle seat 10 outward in the seat width direction (the direction of arrow C in FIG. 6). As shown by a two-dot chain line in FIG. 6, the front side of the bent portion 50E in the reaction force plate 50 is the outer side in the seat width direction from the bent portion 50E to the outer side in the vehicle width direction (the direction of arrow D in FIG. 6). ) Easily deformed. For this reason, the reaction force plate 50 hardly affects the sheet reaction force. As a result, the seated occupant 19 can be safely held.

  Further, when the airbag is deployed and inflated, the reaction force plate 50 tends to be deformed from the support portion P2 with respect to the load acting on the inner side in the seat width direction.

  Note that the shape of the bent portion 50E is not limited to the U shape, and may be another shape such as a V shape. When the reaction force plate 50 is made of a resin material, a groove portion such as a V groove may be provided instead of the bent portion. Furthermore, it is good also as a structure which does not provide inclination part 50D.

  Hereinafter, the fourth embodiment of the vehicle seat with a built-in side airbag device according to the present invention will be described with reference to FIG. In addition, about the same component as 1st, 2nd embodiment mentioned above, the same number is attached | subjected and the description is abbreviate | omitted.

As shown in FIG. 7, in the fourth embodiment, a reaction force plate 50 as a guide plate is made of a resin material, and a triangle is formed on the front portion 50C toward the front side wall portion 22B of the seat back frame side portion 22. The shape deformation suppressing means and the rib 50F as the protruding portion are integrally formed.

  Therefore, in this embodiment, in addition to the effects of the first and second embodiments, when the reaction force plate 50 is deformed inward in the vehicle width direction (in the direction of arrow B in FIG. 7) during airbag deployment and inflation, The rib 50F contacts the front side wall portion 22B of the seat back frame side portion 22. For this reason, the deformation load inward in the seat width direction acting on the reaction force plate 50 can be received by the front side wall portion 22B of the seat back frame side portion 22; The deformation of the force plate 50 toward the inner side in the sheet width direction can be suppressed. As a result, the airbag 18 can be inflated and deployed in the direction of the sewing line H2 (the direction of arrow A in FIG. 7).

  On the other hand, when the seated occupant 19 moves relative to the vehicle seat 10 outward in the seat width direction (in the direction of arrow C in FIG. 7), the rib 50F is separated from the front side wall portion 22B of the seat back frame side portion 22. The reaction force plate 50 is easily deformed inward in the sheet width direction (the direction of arrow D in FIG. 7) with the fixing portion P1 of the rear end portion 50B as a base point. For this reason, the reaction force plate 50 hardly affects the sheet reaction force. As a result, the seated occupant 19 can be safely held.

  In the present embodiment, the entire rear half portion 50A of the reaction force plate 50 may be coupled to the vehicle width direction outer side surface of the base portion 22A of the seat back frame side portion 22. Further, the reaction force plate 50 may be made of metal, and other deformation suppressing means such as a spacer may be retrofitted. Moreover, it is good also as a structure which does not provide inclination part 50D.

  In the above, the present invention has been described in detail for specific embodiments. However, the present invention is not limited to the above-described embodiments, and various other embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art. For example, it is good also as a structure which combined each said embodiment suitably.

  Further, in each of the above embodiments, the sheet skin 26 has a two-layer structure of the first layer 26A configured by a skin or the like and configuring the design surface, and the second layer 26B configured by a foam material or the like. 26 is not limited to a two-layer structure, and may have another structure such as a one-layer structure or a three-layer structure.

  In each of the above embodiments, the side airbag device 20 is activated by a side collision. However, the present invention is not limited to this, and a pre-crash sensor is mounted so that a side collision can be predicted (forecast). The airbag device 20 may be configured to operate.

  Moreover, in each said embodiment, the side airbag apparatus provided with the vertically long and large side airbag 18 by the side view which inflate-deploys in the up-down direction in the position which restrains the range of at least the waist | lumbar part 19A of the seat seated passenger | crew 19 from the chest part 19B. However, the present invention is not limited to this, and the present invention may be applied to a side airbag device including a small side airbag that protects only the chest 19B of the seated occupant 19 and the like. .

FIG. 4 is an enlarged cross-sectional view taken along a 1-1 cross-sectional line in FIG. 3. FIG. 2 is a cross-sectional view corresponding to FIG. 1 illustrating an initial state of airbag deployment of the vehicle seat with a side airbag device shown in FIG. 1. 1 is a schematic side view showing a vehicle seat with a built-in side airbag device according to a first embodiment of the present invention. It is the perspective view seen from the slanting front which shows the seat back frame of the seat for vehicles with a built-in side airbag device concerning a 1st embodiment of the present invention. It is sectional drawing corresponding to FIG. 1 which shows the vehicle seat with a built-in side airbag apparatus which concerns on 2nd Embodiment of this invention. It is sectional drawing corresponding to FIG. 1 which shows the vehicle seat with a built-in side airbag apparatus which concerns on 3rd Embodiment of this invention. It is sectional drawing corresponding to FIG. 1 which shows the vehicle seat with a built-in side airbag apparatus which concerns on 4th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle seat 12 Seat cushion 14 Seat back 18 Side airbag 20 Side airbag apparatus 21 Seat back frame 22 Seat back frame side part 22A Base part of seat back frame side part 24 Seat back pad (seat exterior member)
26 Sheet skin (sheet exterior member)
32 inflator 50 reaction force plate ( guide plate )
50A Rear half part 50B Rear end part 50C Front part 50D Inclined part (rigidity adjusting means)
50E Bent part (rigidity adjusting means)
50F rib (deformation suppression means, protrusion)
H2 burst line

Claims (6)

An airbag that is built into a side portion of the seat back and inflates and deploys forward from the side portion of the seat back;
A sheet exterior member provided with a breaking portion that is broken by the inflation pressure of the airbag;
The breaking portion disposed between the frame of the seat back and the airbag, the plate surface thereof being arranged along the front-rear direction of the seat, and the deployment direction of the airbag being provided in front of the plate surface And a support portion for supporting a load acting on the inner side in the seat width direction on the frame at the intermediate portion in the seat front-rear direction of the plate portion. A guide plate that is fixed to the outer wall portion and is more easily deformed with respect to a load that acts on the outside in the sheet width direction than a load that acts on the inside in the sheet width direction,
A vehicle seat with a built-in side airbag device. 2. The vehicle seat with a built-in side airbag device according to claim 1 , wherein the guide plate has a stiffness adjusting unit that makes the bending stiffness inward in the seat width direction higher than the bending stiffness in the seat width direction outside. 3. The vehicle seat with a built-in side airbag device according to claim 2 , wherein the rigidity adjusting means is an inclined portion that is formed at a front end portion of the guide plate and is inclined toward the front outside in the seat width direction. . The vehicle seat with a built-in side airbag device according to claim 2 , wherein the rigidity adjusting means is a bent portion formed at an intermediate portion in the front-rear direction of the guide plate and protruding outward in the seat width direction. 2. The vehicle seat with a built-in side airbag device according to claim 1 , wherein the guide plate includes a deformation suppressing unit that is formed on a front side portion thereof and suppresses deformation toward an inner side in a seat width direction. To claim 5 wherein the deformation suppressing means, characterized in that the guide plate is suppressing protrusion deformation of the contact seat width direction inside said frame in a state that receives a load acting on the seat width direction inside The vehicle seat with a built-in side airbag device.

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