JP5330758B2 - Seat back structure - Google Patents

Description

  The present invention relates to a seat back structure provided with a side airbag and a movable side support.

In a structure in which a side airbag device is mounted on a side support portion outside a backrest in a seat back, a device including a deployment guide plate for regulating the deployment direction of the airbag of the side airbag device is known (for example, Patent Document 1). In addition, in the structure in which the side airbag device is mounted on the side portion outside the backrest in the seat back, two webbings are stitched to the tier portion provided on the skin of the side support unit, and the airflow between these two webbings A technique is known in which a tear portion can be broken with a low load while a bag is deployed (see, for example, Patent Document 2).
JP 2006-137398 A JP 2001-163163 A

  However, in the conventional technology as described above, the arrangement of the side airbag device on the movable side support portion has not been considered.

  In view of the above fact, the present invention provides a seat back structure having a movable side support portion on the outer side in the seat width direction with respect to the backrest and capable of satisfactorily deploying the airbag of the side airbag device. Is the purpose.

  The seat back structure according to the invention of claim 1 comprises a side airbag device fixed to the outside in the seat width direction with respect to the seat back frame, a side support portion on the outside in the seat width direction of the backrest, and a displacement input member Displacement with respect to the seat back frame is provided on the outer side in the seat width direction with respect to the first cushion portion, the first cushion portion being displaced in the direction of contacting and separating the backrest with respect to the seat back frame, A second cushion portion that has a deployment slit serving as a starting point for deployment of the airbag of the side airbag device, and is attached to the seat back frame inside the seat width direction with respect to the deployment slit; I have.

  In the seat back structure according to the first aspect, when the displacement input member is displaced with respect to the seat back frame, the first cushion portion is displaced in the seat width direction so as to be in contact with and away from the backrest. Thereby, for example, the side support can be adjusted according to the physique of the occupant. On the other hand, for example, in the case of a side collision of a vehicle to which the present seat back structure is applied, the side airbag device is activated. In this case, the airbag is expanded outside the seat back by breaking the second cushion part with the deployment slit of the second cushion part as a break starting point while inflating.

  Here, in this seat back structure, the displacement (force) from the displacement input member may be directly input to the second cushion portion attached to the seat back frame on the inner side in the seat width direction with respect to the development slit. Therefore, there is no gap between the second cushion portion and the seat back frame that allows the airbag in the deployment process to enter as the side support (first cushion portion) is displaced with respect to the seat back frame. For this reason, as described above, the airbag is properly deployed with the second cushion portion appropriately broken by using the deployment slit as a break starting point.

  Thus, in the seat back structure according to the first aspect, the movable side support portion is provided on the outer side in the seat width direction with respect to the backrest, and the airbag of the side airbag device can be satisfactorily deployed.

The seat back structure according to another aspect includes a side airbag device fixed to the outside in the seat width direction with respect to the seat back frame, and a side support portion on the outside in the seat width direction of the back rest, and the displacement input member is the seat back frame. A first cushion portion that is displaced in a direction in which the seat back frame contacts and separates from the backrest, and the first cushion portion is provided on the outer side in the seat width direction with respect to the first cushion portion. A pair of guide members that penetrate the airbag passage and cover a deployment start portion of the airbag in the side airbag device. An airbag guide structure for guiding the airbag deployed between the guide members to the airbag passage; Eteiru.

In the seat back structure according to another aspect , when the displacement input member is displaced with respect to the seat back frame, the first cushion portion is displaced in the seat width direction so as to be in contact with and away from the backrest. Thereby, for example, the side support can be adjusted in accordance with the physique of the passenger. On the other hand, for example, in the case of a side collision of a vehicle to which the present seat back structure is applied, the side airbag device is activated.

  At this time, the airbag is guided into the airbag passage through which the pair of guide members penetrate while being deployed between the pair of guide members of the airbag guide structure. Thereby, an airbag penetrates between the 1st cushion part and the 2nd cushion part in these thickness directions, and is developed outside a seat back. That is, in the present seat back structure, regardless of the adjustment state of the side support portion (the postures of the first and second cushion portions with respect to the seat back frame), the airbag of the side airbag device is connected to the airbag passage by the pair of guide members. Is reliably guided to the outside of the seat back.

Thus, in the seat back structure according to another aspect , the movable side support portion is provided on the outer side in the seat width direction with respect to the backrest, and the airbag of the side airbag device can be favorably deployed.

  As described above, the seat back structure according to the present invention has a movable side support portion on the outer side in the seat width direction with respect to the backrest, and is excellent in that the airbag of the side airbag device can be satisfactorily deployed. Has an effect.

  A seat back structure 10 according to a first embodiment of the present invention will be described with reference to FIGS. It should be noted that the arrows FR, UP, and IN that are appropriately shown in the drawings are the inside in the vehicle width direction that substantially matches the front direction (traveling direction), the upward direction, and the seat width direction of the vehicle to which the seatback structure 10 is applied. Is shown.

  FIG. 2 is a perspective view showing a schematic overall configuration of the vehicle seat 11 to which the seat back structure 10 is applied. As shown in this figure, the vehicle seat 11 includes a seat cushion 12 as a seat portion and a seat back 14 having a lower end portion connected to a rear end portion of the seat cushion 12. A central portion of the seat back 14 in the seat width direction is a backrest 16 that mainly supports the upper body of the seated occupant from the rear.

  A pair of left and right side support portions 18 and 20 are provided on the outer side of the seat back 14 with respect to the back rest 16 in the seat width direction so as to protrude forward from the back rest 16 and support the seated occupant from the side. The side support portion 18 is located on the vehicle width direction inner side (center console side) of the vehicle seat 11, and the side support portion 20 is located on the vehicle width direction outer side (side door side) of the vehicle seat 11.

  These left and right side support portions 18 and 20 are each configured as a movable side support capable of changing the support position (support posture) from the side of the occupant upper body. Hereinafter, mainly the side support part 20 will be specifically described.

  As shown in FIG. 2, a side frame portion 24 extending in the vertical direction in a seat back frame 22 formed in a substantially U shape that opens downward in a front view is disposed in the side support portion 20. . In this embodiment, the side frame portion 24 includes a base portion 24A extending in the front-rear direction in plan view, a front portion 24B extending outward in the seat width direction from the front end of 24A, and a seat from the rear end of the base portion 24A. The rear portion 24C extends inward in the width direction and is formed in a substantially crank shape in plan view.

  The side frame portion 24 supports a side support paddle 26 as a displacement input member via a movable mechanism (not shown). The side support paddle 26 according to this embodiment is movable between an initial position indicated by a solid line in FIG. 2 and an occupant restraint position indicated by an imaginary line in FIG. 2 via a movable mechanism. It is supported by.

  The side support portion 18 has a substantially bilaterally symmetric structure with the above configuration of the side support portion 20. Although not shown, in the side support portion 18, a pad as a cushioning material is attached to the side support paddle 26, and the pad is covered with a skin material. In this side support portion 18, the movable mechanism operates. As a result, the support position (posture) from the side of the occupant's upper body is changed.

  On the other hand, the side support portion 20 is provided with an inner pad portion 28 as a first cushion portion attached to the side support paddle 26 and an outer pad portion 30 as a second cushion portion attached to the side frame portion 24. Yes. The inner pad portion 28 is mainly located on the inner side in the seat width direction with respect to the side frame portion 24, and the side support paddle 26 moves between the initial position and the occupant restraining position, so that the inner pad portion 28 contacts and separates from the backrest 16. (Displaced in the sheet width direction).

  The outer pad portion 30 is mainly positioned in front of the front portion 24B of the side frame portion 24 and the outer portion in the seat width direction with respect to the front portion 24B. An inner portion in the vehicle width direction at the rear portion of the outer pad portion 30 is fixed to the front portion 24B of the side frame portion 24 by adhesion or the like. In this state, a notch-shaped slit 32 is formed between the inner pad portion 28 and the outer pad portion 30. In this embodiment, the notch-like slit 32 is elongated in the direction of movement between the initial position of the side support paddle 26 and the occupant restraint position in plan view, and the front portion 24B of the side frame portion 24 is formed. To a portion covered with a skin material 36, which will be described later, through the cushion material.

  Further, a deployment slit 34 is provided in a portion of the outer pad portion 30 that is located on the outer side in the seat width direction with respect to the front portion 24B (fixed portion to the front portion 24B) for deployment of a side airbag 64 of a side airbag device 58 described later. Is formed. The detailed structure of the deployment slit 34 will be described later together with the side airbag device 58. The inner pad portion 28 and the outer pad portion 30 may be configured as separate members with the slit 32 as a boundary, and the installation range of the side airbag device 58 (the height range required for the deployment of the side airbag 64). Only one slit 32 (through hole) may be formed.

  The inner pad portion 28 and the outer pad portion 30 described above are covered with the skin materials 36 and 38. In the skin material 36, the inner rear end portion 36 </ b> A in the seat width direction is locked to the wire 42 by a hog ring or the like via the skin material 40 or the like constituting the backrest 16. On the other hand, the inner rear end portion 38 </ b> A of the skin material 38 is locked to the rear portion 24 </ b> C of the side frame portion 24 via the hook member 44. The outer front end portion 36B of the skin material 36 and the outer front end portion 38B of the skin material 38 are connected by sewing in the vicinity of the front and outer top portions of the side support portion 20 to constitute a tier portion 46.

  One end 48A of the inner force cloth 48 is fixed to the outer front end portion 36B of the skin material 36 constituting the tier portion 46 by sewing. The inner force cloth 48 is formed in a band shape and is disposed inside the skin material 36, and the other end 48 </ b> B is locked to a bracket 50 fixed to the rear portion 24 </ b> C of the side frame portion 24. In this embodiment, the other end 48B of the inner force cloth 48 is formed by folding an end portion inserted through the through hole 50A of the bracket 50 and sewing it in the vicinity of the end portion so that the annular portion is locked to the bracket 50. Has been. In this embodiment, a surplus length absorbing rubber, which is an elastic material for absorbing the surplus length, is attached to the vicinity of the other end 48B of the inner force cloth 48 by sewing or the like.

  On the other hand, one end 52A of the outer force cloth 52 is fixed to the outer front end portion 38B of the skin material 38 constituting the tier portion 46 by sewing. The outer force cloth 52 is formed in a band shape and is disposed inside the skin material 38, and the other end 52 </ b> B is locked to a bracket 54 fixed to the rear portion 24 </ b> C of the side frame portion 24. In this embodiment, the other end 52B of the outer force cloth 52 has an annular portion locked to the bracket 54 by folding an end portion inserted through the through hole 54A of the bracket 54 and sewing the end portion in the vicinity of the end portion. Has been.

  The inner force cloth 48 and the outer force cloth 52 described above are made of a material that hardly stretches with respect to the skin materials 36 and 38, respectively. Further, in the seat back 14 according to this embodiment, a portion from the side portion of the side support portion 20 to the rear portion of the backrest 16 is covered with the seat back board 56. Although illustration is omitted, the seat back board 56 extends to the side portion of the side support portion 18.

  A side airbag device 58 is disposed on the side support portion 20 of the seat back 14 to which the seat back structure 10 is applied. The side airbag device 58 is fixed to the outer side in the seat width direction with respect to the base portion 24 </ b> A of the side frame portion 24. In this embodiment, the side airbag device 58 includes a base part (case) 60 fixed to the base part 24 </ b> A of the side frame part 24, an inflator 62 as gas generating means supported by the base part 60, and the inflator 62. The side airbag 64 as an airbag that is inflated and deployed from the folded state upon receiving the gas supply is mainly configured.

  The side airbag device 58 (base portion 60) has a substantially rectangular shape that is long in the front-rear direction in a plan view, and the deployment slit 34 in the outer pad portion 30 is formed around the front corner portion 58A. Both sides are in contact. In other words, the outer pad portion 30 is formed on the front edge portion 58B and the outer edge portion 58C of the side airbag device 58 so as to straddle the front and outer corners 58A of the side airbag device 58 by the deployment slit 34. In contact. The deployment slit 34 of the outer pad portion 30 is formed from the front outer corner portion 58 </ b> A in the side airbag device 58 toward the tier portion 46. In this embodiment, the deployment slit 34 has a tapered shape (wedge shape) that is wider on the front and outer corners 58 </ b> A side than on the tier portion 46 side in plan view.

  An air bag ECU (not shown) is electrically connected to the inflator 62 of the side air bag device 58 described above. The airbag ECU activates the inflator 62 when it is determined, for example, that a side collision has occurred in the vehicle on which the vehicle seat 11 is mounted, or a side collision is inevitable, based on an input signal from a side collision sensor. It is configured as follows.

  Next, the operation of the first embodiment will be described.

  In the vehicle seat 11 to which the seat back structure 10 having the above configuration is applied, for example, when a seated occupant operates a side support operation switch, the movable mechanism is activated and the side support paddle 26 moves from the initial position to the occupant restraint position. Thereby, the inner side pad part 28 of the side support part 20 is displaced to the backrest 16 side (sheet width direction inward). Similarly, the pad constituting the side support portion 18 is also displaced toward the backrest 16 side. Thus, the upper body of the occupant is effectively supported from the side by the left and right side support parts 18 and 20 (the degree of occupant restraint by the side support parts 18 and 20 is adjusted).

  When the airbag ECU determines that a side collision has occurred in the vehicle on which the vehicle seat 11 is mounted or that the side collision is inevitable, the airbag ECU activates the inflator 62 of the side airbag device 58. Then, the side airbag 64 receives the gas supply from the inflator 62 and starts to expand and deploy. At the initial stage of deployment, the inflation pressure of the side airbag 64 acts on the inner force cloth 48 and the outer force cloth 52 via the inner pad portion 28 and the outer pad portion 30. Further, in this process, stress concentration occurs at the site where the development slit 34 is formed in the outer pad portion 30, and the outer pad portion 30 is broken from the development slit 34 toward the tier portion 46.

  When the load based on the expansion pressure acting on the inner force cloth 48 and the outer force cloth 52 exceeds the breaking load of the tear portion 46, the suture thread of the skin material 36 and the skin material 38 is broken, and the broken portion is As a result, the tear portion 46 is cleaved along the vertical direction (breaking progresses up and down). The side airbag 64 is inflated from the teared tier portion 46, and is deployed on the side (side door side) of the seated occupant of the vehicle seat 11, as indicated by an imaginary line in FIG. Thereby, the seated occupant of the vehicle seat 11 is protected against a side collision.

  Here, in the seat back structure 10, since the slit 32 is formed between the inner pad portion 28 and the outer pad portion 30, the outer pad portion 30 is displaced by the displacement of the inner pad portion 28 accompanying the displacement of the side support paddle 26. Is prevented from being displaced (deformed). In addition, since the outer pad portion 30 is fixed to the side frame portion 24 on the inner side in the seat width direction with respect to the development slit 34, even if the side support paddle 26 moves to the occupant restraint position, the front portion 24 </ b> B and the outer pad portion It is possible to prevent a gap from being formed with 30.

  For example, in a configuration including a pad such that the inner pad portion 28 and the outer pad portion 30 are integrally formed without the slit 32, the entire pad follows the side support paddle 26, so that the displacement of the side support paddle 26 is changed. Accordingly, there is a concern that a gap is formed between the pad, the front portion 24B of the side frame portion 24, and the base portion 60. This gap becomes a cause of hindering good deployment of the side airbag 64 when the side airbag 64 enters during the inflating and deploying process.

  On the other hand, in the seat back structure 10, since a gap is prevented from being formed between the front portion 24 </ b> B and the outer pad portion 30 as described above, the side airbag 64 breaks the outer pad portion 30. At the same time, the tear portion 46 is cleaved through the inner force cloth 48 and the outer force cloth 52, and thus the outer support cloth 20 is well developed on the outer side.

  As described above, in the seat back structure 10 according to the first embodiment of the present invention, the side airbag 64 of the side airbag device 58 is configured with the movable side support portion 20 on the outer side in the seat width direction with respect to the backrest 16. Can be developed well.

Hereinafter, “second embodiment” is read as “reference example”.
(Second Embodiment)
Next, a seat back structure 70 according to a second embodiment of the present invention will be described based on FIGS. 3 (A) and 3 (B). Note that components / parts configured basically in the same manner as in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and description thereof is omitted.

  In FIG. 3A, the main part of the seat back structure 70 is shown in a plane sectional view corresponding to FIG. As shown in this figure, the seat back structure 70 has a notch-shaped slit 75 formed between the inner pad portion 72 and the outer pad portion 74 in place of the development slit 34, and thus the first back. This is different from the seat back structure 10 according to the embodiment. That is, the slit 75 extends from the vicinity of the front outer corner 58 </ b> A of the side airbag device 58 to the tier 46 in a plan view.

  The seat back structure 70 includes an inner force cloth 76 and an outer force cloth 78 as a pair of guide members, and an airbag guide structure 80 that guides the side airbag 64 at the initial stage of deployment to the notch-shaped slit 75. I have. This will be specifically described below.

  One end 76 </ b> A of the inner force cloth 76 is fixed to the outer front end 36 </ b> B (the tier portion 46) of the skin material 36 by sewing, and an intermediate portion thereof penetrates the slit 75 and the side airbag device 58 (the base portion 60). The other end 76 </ b> B is engaged with the front portion 24 </ b> B of the side frame portion 24. One end 78A of the outer force cloth 78 is fixed to the outer front end portion 38B (tier portion 46) of the skin material 38 by sewing, and an intermediate portion thereof penetrates the slit 75 and the side airbag device 58 (base portion 60). The other end 78 </ b> B is engaged with the base 24 </ b> A of the side frame portion 24.

  As a result, in the airbag guide structure 80, the vicinity of the front outer corner portion 58A, which is the deployment start portion of the side airbag 64 in the side airbag device 58, is between the pair of webbings (the inner webbing 76 and the outer webbing 78). Between). With this configuration, the airbag guide structure 80 is configured to guide the side airbag 64 at the initial stage of inflation and deployment into the slit 75 by the inner force cloth 76 and the outer force cloth 78 as shown in FIG. .

  The inner pad portion 72 and the outer pad portion 74 may be configured as separate members with the slit 75 as a boundary, and the installation range of the side airbag device 58 (the height range required for the deployment of the side airbag 64). Only one slit 75 (through hole) may be formed. The other configuration of the seat back structure 70 (the vehicle seat 11 to which the seat back structure 70 is applied) is basically the same as the corresponding configuration of the seat back structure 10 (the vehicle seat 11 to which the seat back structure 10 is applied).

  Next, the operation of the second embodiment will be described.

  In the vehicle seat 11 to which the seat back structure 70 having the above configuration is applied, for example, when a seated occupant operates a side support operation switch, the movable mechanism is operated and the side support paddle 26 moves from the initial position to the occupant restraint position. Thereby, the inner side pad part 28 of the side support part 20 is displaced to the backrest 16 side (sheet width direction inward). Similarly, the pad constituting the side support portion 18 is also displaced toward the backrest 16 side. Thus, the upper body of the occupant is effectively supported from the side by the left and right side support parts 18 and 20 (the degree of occupant restraint by the side support parts 18 and 20 is adjusted).

  When the airbag ECU determines that a side collision has occurred in the vehicle on which the vehicle seat 11 is mounted or that the side collision is inevitable, the airbag ECU activates the inflator 62 of the side airbag device 58. Then, the side airbag 64 receives the gas supply from the inflator 62 and starts to expand and deploy. At the initial stage of deployment, as shown in FIG. 3B, the inflation pressure of the side airbag 64 directly acts on the inner force cloth 76 and the outer force cloth 78, while the inner force cloth 76 and the outer force cloth 78. The side airbag 64 is guided to the slit 75 by 78.

  When the load based on the expansion pressure acting on the inner force cloth 76 and the outer force cloth 78 exceeds the breaking load of the tear portion 46, the suture thread of the skin material 36 and the skin material 38 is broken, and this broken portion is As a result, the tear portion 46 is cleaved along the vertical direction (breaking progresses up and down). The side airbag 64 is inflated from the teared tier portion 46, and is deployed on the side (side door side) of the seated occupant of the vehicle seat 11, as indicated by an imaginary line in FIG. Thereby, the seated occupant of the vehicle seat 11 is protected against a side collision.

  Here, in the seat back structure 70, a slit 75 is formed between the inner pad portion 72 and the outer pad portion 74, and an airbag guide structure 80 that guides the side airbag 64 to the slit 75 is provided. Therefore, the side airbag 64 of the side airbag device 58 can be satisfactorily deployed as described above regardless of the position of the movable side support portion 20 (the posture of the inner pad portion 72 and the outer pad portion 74).

  Thus, in the seat back structure 70 according to the second embodiment of the present invention, the side airbag 64 of the side airbag device 58 is configured with the movable side support portion 20 on the outer side in the seat width direction with respect to the backrest 16. Can be developed well.

  3A is slightly different in structure from that shown in FIG. 1, but the slit 75 according to the second embodiment, the airbag guide structure 80, etc. are applied to the structure shown in FIG. It goes without saying that you can do it. On the other hand, it goes without saying that the slit 32, the developing slit 34, etc. according to the first embodiment can be applied to the structure as shown in FIG.

  Further, in the above-described embodiment, the example in which the seat back structures 10 and 70 are applied to the side support portion 20 on one side of the seat back 14 with respect to the backrest 16 is shown, but the present invention is not limited to this, for example, The seat back structures 10 and 70 may be applied to the side support portion 18.

It is a plane sectional view expanding and showing a waist part of a seat back structure concerning a 1st embodiment of the present invention. 1 is a perspective view showing a vehicle seat to which a seat back structure according to a first embodiment of the present invention is applied. It is a figure which shows the principal part of the seat back structure which concerns on the 2nd Embodiment of this invention, Comprising: (A) is a plane sectional view before airbag deployment, (B) is a plane sectional view in the initial stage of airbag deployment. .

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Seat back structure 14 Seat back 16 Backrest 20 Side support part 22 Seat back frame 26 Side support paddle (displacement input member)
28 Inner pad (first cushion)
30 Outer pad part (second cushion part)
34 Deployment slit 58 Side airbag device 64 Side airbag (airbag)
70 Seat back structure 72 Inner pad part (first cushion part)
74 Outer pad part (second cushion part)
75 Slit (Airbag passage)
76 Inner force cloth (one of a pair of guide members)
78 Outer force cloth (the other of a pair of guide members)
80 Airbag guide structure

Claims (1)

A side airbag device fixed to the outside in the seat width direction with respect to the seat back frame;
A first cushion that forms a side support portion on the outer side in the seat width direction of the backrest, and is displaced in a direction in which the backrest rests on and away from the seatback frame when the displacement input member is displaced with respect to the seatback frame. And
Provided on the outer side in the seat width direction with respect to the first cushion portion, and having a deployment slit serving as a starting point for the deployment of the airbag of the side airbag device, on the inner side in the seat width direction with respect to the deployment slit A second cushion portion attached to the seat back frame;
Seat back structure with

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