JP2013203368A - Seat structure - Google Patents

Abstract

An object of the present invention is to provide a seat structure having a simple structure capable of effectively assisting the tearing of a tear portion of a trim cover when an airbag bag body provided in an airbag is inflated and deployed.
An airbag device having an airbag bag body 2a that is inflated and deployed with a deployment pressure generated by an inflator 2b, and a seat pad 1d are encased in a trim cover 1e, and the airbag bag body that is inflated and deployed. The trim structure 1e2 is pushed out from the inside by 2a, and a tear structure 1e2 that breaks is provided in the trim cover 1e. The trim cover 1e is engaged with the seat pad 1d by the surface fastener 3 to apply a tensile load to the tier portion 1e2 when the airbag bag body 2a is inflated.
[Selection] Figure 2

Description

  The present invention relates to a seat structure of a vehicle seat including a side airbag device.

A side airbag device built in a vehicle seat breaks a tear portion formed on a trim cover that covers an air bag body that is inflated by a pressure (deployment pressure) generated by an inflator, to the outside of the seat. Expand to. Therefore, it is necessary to have a structure in which the tear portion is quickly broken by the inflating airbag bag body.
For example, Patent Literatures 1 and 2 disclose a side airbag device that effectively inflates and deploys an airbag bag body to the outside of a seat using a webbing. The force cloth is made of a material that does not expand and contract (or has a small expansion and contraction), and is configured to generate a tensile load on the tier portion when the inflating airbag bag body pushes the trim cover from the inside of the seat. This tensile load assists the tearing of the tear portion, so that the airbag bag body can quickly break the tear portion and can be quickly deployed outside the seat.

Japanese Patent No. 3831810 Japanese Patent No. 381858

In order to effectively break the tier portion of the trim cover by the expansion of the airbag bag body, it is effective to sew the bundling to the trim cover in the vicinity of the tier portion and generate a tensile load on the tier portion. . Furthermore, by shortening the length of the webbing, the stretch of the webbing can be further suppressed, and a tensile load on the tier portion can be generated more effectively.
However, the provision of the bundling increases the number of parts incorporated inside the sheet, which causes problems such as a complicated structure and complicated sheet assembling work.
Further, since the webbing is stretched with an appropriate tension, the trim cover to which the webbing is sewn is tensioned and easily deformed, resulting in a problem that the appearance is impaired.

  Accordingly, an object of the present invention is to provide a seat structure having a simple structure that can effectively assist the tearing of the tear portion of the trim cover when the airbag bag body included in the airbag is inflated and deployed.

  In order to solve the above-mentioned problem, the present invention provides an airbag device having an airbag bag body that is inflated and deployed by a deployment pressure generated by an inflator, and an inner member that is encapsulated by a cover member and that is inflated and deployed. A seat structure for a vehicle seat is provided in which a tear portion that is broken by being pushed out from the inside by a bag body is provided on the cover member. The cover member is engaged with the inner member, and a tensile load is applied to the tier portion when the airbag bag body is inflated.

  According to the present invention, the cover member can be engaged with the inner member. And a tension | tensile_strength can be made to act at the time of expansion | swelling of an airbag bag body, and it can be set as the structure which can tear a tear part easily. Therefore, it can be set as the structure which does not require a power cloth, and can make the seat structure of a vehicle seat into a simple structure.

The cover member of the present invention is formed by stitching a plurality of fabric pieces, and the tier portion is formed at a stitched portion of the fabric pieces.
According to the present invention, it is possible to form a tear portion that is easily broken at the stitched portion of the fabric piece forming the cover member.

According to the present invention, the engaging means for engaging the cover member with the inner portion is a hook-and-loop fastener.
According to the present invention, the cover member can be engaged with the inner member using the hook-and-loop fastener. Therefore, it is possible to make a structure that does not require a bundling, and the cover member can be engaged with the inner member with a simple structure.

  Further, the airbag device of the present invention is incorporated in a side of a seat back of the vehicle seat, and the tier portion includes the fabric piece on the front surface of the cover member enclosing the seat back, and the airbag device. It is formed in the stitching | suture part with the said fabric piece of the side to be integrated. The cover member is engaged with the inner member on the front surface of the seat back.

  According to the present invention, the stitching portion of the fabric piece on the front side and the fabric piece on the side where the airbag device is incorporated can be used as the tear portion, and the fabric piece on the front surface can be engaged with the inner member. Therefore, a force cloth stitched to the fabric piece on the front surface is not necessary. The front surface is a position where the occupant can easily see, and the need to sew the fabric cloth on the front fabric piece becomes unnecessary, so that the deformation of the trim cover at the position where the occupant can easily see can be suppressed, improving the quality. To do.

  ADVANTAGE OF THE INVENTION According to this invention, the seat structure of the simple structure which can assist effectively the fracture | rupture of the tear part of a trim cover at the time of expansion | deployment of the airbag bag body with which an airbag apparatus is equipped can be provided.

It is a perspective view which shows the structure of the vehicle seat. (A) is a figure which shows the internal structure of a side part, Comprising: Sec1-Sec1 sectional drawing of FIG. 1, (b) is a perspective view which shows the internal structure of a side part. (A) is a conceptual diagram which shows the state which an airbag bag body expand | deploys toward the left side, (b) is a conceptual diagram which shows the state in which an airbag bag body fracture | ruptures a tear part. (A) is sectional drawing which shows the structure by which the left side of a trim cover is fastened to a seat pad by a surface fastener, (b) is a concept which shows the state which an airbag bag body fracture | ruptures the tear part of a seat pad and a trim cover FIG.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings as appropriate.
As shown in FIG. 1, the seat structure according to the present embodiment is applied to, for example, a separate type vehicle seat 1 provided in a driver seat or a passenger seat of a vehicle (not shown).
The vehicle seat 1 includes a seating portion 1a on which an occupant sits, and a backrest portion (seat back 1b) that supports the back of the seated occupant.
A headrest 4 is attached to the seat back 1b.
In the following, the front, rear, left and right are the same as the front, rear, left and right of the vehicle. That is, the front and rear are front and rear of the vehicle, and the left and right are left and right as seen from the rear.

The seating portion 1a and the seat back 1b are each formed by covering an inner member (cushion material or the like) with a cover member (trim cover 1e) covering the surface.
The seat back 1b provided in the vehicle seat 1 includes a surface facing the front (front surface 1bF) and a surface facing the left and right sides (side surface 1bS). As shown in FIG. 2 (a), the seat back 1b is disposed around the seat frame 1f serving as a skeleton to form a shape, and is an inner member (seat pad 1d) that imparts cushioning properties with appropriate elasticity. ) Is covered with a trim cover 1e.
Further, the left and right side surfaces 1bS slightly protrude forward in the seat back 1b to form a side portion 1c, and the occupant seated on the seating portion 1a is preferably held on the back by the side portion 1c. In particular, the occupant's back is held against shaking in the left-right direction so that the occupant can ride comfortably.
As shown in FIGS. 2A and 2B, the side portion 1c is formed by a seat pad 1d shaped so as to project forward, and its surface is covered with a trim cover 1e.

  Since the seat back 1b having a three-dimensional shape on which the side portion 1c projecting forward is suitably encapsulated, the shape of the trim cover 1e is complicated. Therefore, it is preferable that the trim cover 1e is formed by stitching several pieces of fabric pieces at the stitching portion 1e1. With this configuration, the trim cover 1e having a complicated shape can be easily formed.

For example, a fabric piece corresponding to the fabric piece (front fabric piece 1eF) on the front surface 1bF of the seat back 1b, the fabric piece on the left side surface 1bS (left fabric piece 1eL) of the seat back 1b, and the right side surface 1bS of the seat back 1b. The trim cover 1e can be formed by stitching pieces (not shown).
Note that the fabric piece forming the trim cover 1e according to the present embodiment can be selected as appropriate, such as genuine leather, synthetic leather, fabric such as fabric, and the like.

Further, an airbag device (side airbag device 2) is incorporated in the side portion 1c of the seat back 1b according to the present embodiment. For example, a side airbag device 2 is incorporated inside a left side portion 1c in a vehicle seat 1 (a passenger seat of a right-hand drive vehicle) provided on the left side of the vehicle.
Hereinafter, description will be given based on the vehicle seat 1 provided on the left side of the vehicle. In addition, what is necessary is just to set it as the right-and-left reverse structure when applying this embodiment to the vehicle seat 1 (driver's seat of a right-hand drive vehicle) with which the vehicle right side is equipped.

As shown in FIG. 2 (a), the side airbag device 2 is incorporated in the seat back 1b and encapsulated by a trim cover 1e together with the seat pad 1d.
The side airbag device 2 includes an airbag bag body 2a that is inflated and deployed forward from the left side of the seat back 1b, an inflator 2b that supplies deployment pressure for inflating and deploying the airbag bag body 2a, A storage portion 2c for storing the bag bag body 2a and the inflator 2b and a control portion (not shown) for generating a signal for operating the inflator 2b are configured.

  The airbag bag body 2a is appropriately folded and stored in the storage section 2c together with the inflator 2b. When the deployment pressure is supplied from the inflator 2b, the airbag bag body 2a rapidly expands and expands from the storage section 2c, It is comprised so that it may expand | deploy from the left side of the seat back 1b toward the front. The storage portion 2c is fixed to the seat frame 1f, for example.

  Since the side airbag device 2 is encapsulated in the trim cover 1e together with the seat pad 1d, the side airbag device 2 is disposed inside the trim cover 1e. Accordingly, the airbag bag body 2a that is inflated by being supplied with the deployment pressure from the inflator 2b pushes the trim cover 1e from the inside toward the outside. Therefore, a part of the stitching portion 1e1 of the trim cover 1e is formed weakly to form a tear portion 1e2 that is easily broken, and is configured to be easily broken when the airbag bag body 2a pushes the trim cover 1e from the inside. .

  For example, as shown in FIGS. 1 and 2A, a side airbag device 2 is disposed on the left side of the vehicle seat 1 on the left side of the vehicle. Therefore, the front fabric piece 1eF that covers the front surface of the seat back 1b and the left fabric piece 1eL that covers the left side are formed along the top of the side portion 1c projecting forward. The portion 1e1 is formed to be fragile to be a tier portion 1e2.

  The method for forming the tier portion 1e2 in the stitched portion 1e1 is not limited. The suture used for sewing the suture portion 1e1 as the tear portion 1e2 is made thinner and weaker than the suture used for sewing the other suture portions 1e1, and the amount of suture used is reduced. The stitched portion 1e1 can be easily formed fragile, and the tier portion 1e2 can be obtained.

However, when the airbag cover 2a expands and the trim cover 1e is pushed out from the inside and the trim cover 1e extends, the tier 1e2 does not break until the extension reaches the limit, and the airbag bag 2a Expansion to the outside is delayed. Further, when a place other than the tier portion 1e2 breaks during the extension of the trim cover 1e, the airbag bag body 2a is inflated and deployed from there to the outside of the seat back 1b. In this case, the airbag bag body 2a does not deploy at a position suitable for passenger protection, and the side airbag device 2 does not function sufficiently.
Therefore, in order to suppress the extension of the trim cover 1e and to assist the breaking at the tier portion 1e2 with a suitable tensile load, as shown in FIGS. 2 (a) and 2 (b), the left side of the side airbag device 2 is provided. A webbing 2d is disposed inside the seat back 1b of the side portion 1c.

The webbing 2d is a belt-like member formed of a material that does not expand and contract (or has little expansion and contraction), and one end thereof is locked by, for example, a locking part (bundling wire 1g) fixed to the seat frame 1f. The webbing 2d extends toward the front inside the left fabric piece 1eL along the left side surface 1bS, and is sewn from the inside to the left fabric piece 1eL in the vicinity of the stitching portion 1e1 where the other end becomes the tier portion 1e2. The
At this time, it is preferable that the webbing 2d is stretched with an appropriate tension to generate a suitable tensile load on the tier portion 1e2.

  Further, it is preferable that the force cloth 2d is disposed so as to pass through the left side of the airbag bag body 2a. With this configuration, the webbing 2d is pushed outward from the inside of the trim cover 1e toward the left side when the airbag bag body 2a is inflated toward the left side.

  In order not to expose the stitched portion of the webbing 2d and the left fabric piece 1eL to the exterior of the vehicle seat 1, for example, the end of the left fabric piece 1eL is folded inside the seat back 1b at the stitched portion 1e1 and folded. It is good also as a structure which sews the power cloth 2d to a part.

  With the configuration in which the webbing 2d is arranged in this way, the airbag bag body 2a that expands toward the left side can push the webbing 2d to the left side. Since the webbing 2d is formed of a material that does not expand and contract, a deployment pressure for inflating the airbag bag body 2a can be applied to the stitched part 1e1 that becomes the tier part 1e2 via the webbing 2d. Further, in addition to the tensile load due to the stretched cloth 2d, a tensile load due to the expansion of the airbag body 2a can be applied to the stitched portion 1e1.

On the other hand, the front fabric piece 1eF is disposed on the front surface 1bF of the seat back 1b so as to face the seat pad 1d, and in the present embodiment, the front fabric piece 1eF is engaged with the seat pad 1d. To do.
For example, as shown in FIGS. 2 (a) and 2 (b), a set of hook-and-loop fasteners 3 to be engaged with each other is attached to the seat pad 1d and the front fabric piece 1eF, and the sheet fastener 3 is used as an engaging means. The front fabric piece 1eF is engaged with the pad 1d.

  As shown in FIG. 3 (a), the airbag bag body 2a is inflated to the left side and the front side when the deployment pressure is supplied from the inflator 2b, and the webbing 2d is moved to the left side from the inside of the trim cover 1e. Push it out. Since the end portion of the force cloth 2d is stitched to the left fabric piece 1eL, the airbag 1 is inflated in addition to the tensile load by the tension cloth 2d stretched on the stitch portion 1e1 of the left fabric piece 1eL and the front fabric piece 1eF. A tensile load is generated by the bag body 2a pushing out the webbing 2d.

The tensile load generated in the stitching portion 1e1 is input to the front fabric piece 1eF via a suture thread that stitches the left fabric piece 1eL and the front fabric piece 1eF.
However, since the front fabric piece 1eF is engaged with the seat pad 1d by the surface fastener 3, it does not expand due to the tensile load. Accordingly, a tensile load acts on the stitched portion 1e1 also from the front fabric piece 1eF side. That is, when the airbag bag body 2a is inflated, the surface fastener 3 applies a tensile load to the stitched portion 1e1. As a result, the tensile load generated in the stitching portion 1e1 can be concentrated and acted on the stitching portion 1e1.

  The stitched portion 1e1 of the front fabric piece 1eF and the left fabric piece 1eL is a fragile tier portion 1e2, and the suture thread that stitches the stitched portion 1e1 and its surroundings are easily broken. Therefore, when the tensile load is concentrated and acts on the suture thread for sewing the suture portion 1e1, the suture portion 1e1 is easily broken as shown in FIG. The airbag body 2a is inflated and deployed from the broken tier 1e2 toward the outside of the trim cover 1e.

  That is, the tier portion 1e2 (the stitched portion 1e1) is pushed and broken by the airbag bag body 2a that is inflated from the inside of the trim cover 1e. And the hook-and-loop fastener 3 which fastens the trim cover 1e to the seat pad 1d has a function of suppressing the extension of the trim cover 1e when the tier portion 1e2 is pushed out from the inside of the trim cover 1e by the airbag bag body 2a. As a result, the hook and loop fastener 3 assists in breaking the tier portion 1e2.

As described above, the vehicle seat 1 (see FIG. 1) according to the present embodiment includes the front fabric piece 1eF that covers the front surface 1bF of the seat back 1b and the side airbag device 2 as shown in FIG. The stitched portion 1e1 between the left-side left fabric piece 1eL provided with a tier portion 1e2. Then, the front fabric piece 1eF is engaged with the seat pad 1d, which is an inner member, with the surface fastener 3.
Further, a belt-like webbing 2d is disposed on the left side, and one end is sewn to the left fabric piece 1eL. The webbing 2d is stretched with an appropriate tension and applies a tensile load to the stitched portion 1e1 which becomes the tier portion 1e2. Further, it is preferable that the webbing 2d is arranged so as to pass through the left side of the side airbag device 2 and pushed out to the left side by the inflating airbag bag body 2a.

When the inflating airbag body 2a pushes the webbing 2d toward the left side from the inside of the trim cover 1e, the seam 1e1 of the front fabric piece 1eF and the left fabric piece 1eL is formed by the stretched fabric cloth 2d. In addition to the tensile load, a tensile load due to the expansion of the airbag bag body 2a acts.
The front fabric piece 1eF of the trim cover 1e is pulled leftward by a tensile load acting on the stitched portion 1e1 with the left fabric piece 1eL. However, since the front fabric piece 1eF is engaged with the seat pad 1d by the surface fastener 3, the extension is suppressed. As a result, the tensile load acts on the stitching portion 1e1 in a concentrated manner. The stitched portion 1e1 of the front fabric piece 1eF and the left fabric piece 1eL is a tier portion 1e2, and is easily broken by an acting tensile load.

Further, the number of the webbing 2d can be reduced by the structure in which the trim cover 1e (the front fabric piece 1eF) is engaged with the seat pad 1d by the surface fastener 3, and the trim cover 1e can be deformed by the stretched webbing 2d. Can be suppressed. Therefore, it is suitably suppressed that the appearance is impaired.
In particular, it is possible to suppress deformation of the front fabric piece 1eF that is easily visible to the passenger or the like by reducing the force cloth 2d sewn to the front fabric piece 1eF that covers the front surface 1bF of the seat back 1b. Accordingly, it is possible to suitably suppress the deterioration in quality due to the deformation of the front fabric piece 1eF.

For example, as shown in FIGS. 4A and 4B, a seat pad 1d is also provided on the side where the airbag bag body 2a is inflated (left side in the present embodiment), and the airbag bag body 2a. There is also a side airbag device 2 configured to inflate and deploy toward the outside of the trim cover 1e by breaking the seat pad 1d and the trim cover 1e.
In this case, the left fabric piece 1eL may also be engaged with the seat pad 1d disposed on the left side with the hook and loop fastener 3.

  With such a configuration, as shown in FIGS. 2A and 2B, the webbing 2d sewn to the left fabric piece 1eL can be deleted, and the vehicle seat 1 (see FIG. 1) can be removed. The internal structure can be made simpler. For example, the bundling wire 1g (see FIG. 3A) for fastening the bundling 2d can be deleted, and the components of the vehicle seat 1 (see FIG. 1) can be reduced. Further, in the production process of the vehicle seat 1, there is no process of drawing the webbing 2d and stitching it to the left fabric piece 1eL, so that the work efficiency can be improved.

  Further, since the force for breaking the seat pad 1d by the inflating airbag bag body 2a is directly transmitted to the trim cover 1e, the stitching portion 1e1 (the tier portion 1e2) can be effectively broken by the force for breaking the seat pad 1d. .

  Thus, when the seat pad 1d is disposed on the side where the airbag bag body 2a is inflated, a configuration in which the trim cover 1e is engaged with the seat pad 1d by the surface fastener 3 is preferable. With this configuration, the webbing 2d becomes unnecessary, and it is possible to suppress the appearance from being affected by the tension of the webbing 2d. In addition, the internal structure of the vehicle seat 1 (see FIG. 1) can be made simpler. As a result, the efficiency of assembling the vehicle seat 1 is improved, and the vehicle seat 1 is also lightened.

  The engaging means for engaging the trim cover 1e (see FIG. 2A) to the seat pad 1d (see FIG. 2A) is limited to the hook-and-loop fastener 3 (see FIG. 2A). Not. For example, a method of sticking the trim cover 1e to the seat pad 1d using a double-sided tape as an engaging means may be used. That is, the trim cover 1e is attached to the seat pad 1d so that the extension of the front fabric piece 1eF (see FIG. 2A) can be suppressed with respect to the tensile load input from the tier 1e2 (see FIG. 2A). The method is not limited as long as it is an engaging means that can be attached to the device.

  Further, the present invention is not limited to the side airbag device 2 (see FIG. 1) provided on the side of the vehicle seat 1 (see FIG. 1), and can be appropriately applied to an airbag device provided in another place.

1 Vehicle Seat 1d Seat Pad (Inner Member)
1e Trim cover (cover member)
1e1 stitched part 1e2 tier part 1eF front fabric piece (front fabric piece)
1eL left fabric piece (side fabric piece with air bag device)
2 Side airbag device (airbag device)
2a Air bag body 2b Inflator 3 Side fastener (engaging means)

Claims (4)

An airbag device having an airbag bag body that is inflated and deployed with a deployment pressure generated by an inflator, and an inner member are encapsulated by a cover member,
A seat structure of a vehicle seat in which a tier portion that is broken by being pushed out from the inside by the airbag bag body that is inflated and deployed is provided on the cover member,
The seat structure, wherein the cover member is engaged with the inner member, and a tensile load is applied to the tier portion when the airbag bag body is inflated. The cover member is formed by sewing a plurality of fabric pieces,
The sheet structure according to claim 1, wherein the tier portion is formed at a stitched portion of the fabric piece.   The seat structure according to claim 1 or 2, wherein the engaging means for engaging the cover member with the inner portion is a hook-and-loop fastener. The airbag device is incorporated in a side of a seat back of the vehicle seat,
The tier portion is formed at a stitched portion of the fabric piece on the front surface of the cover member that encloses the seat back and the fabric piece on the side where the airbag device is incorporated,
The seat structure according to any one of claims 1 to 3, wherein the cover member is engaged with the inner member on the front surface of the seat back.

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