JP2016130114A - Side airbag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a side airbag device capable of attenuating inflation/deployment energy of a bag body at timing before or after a seat skin is broken, and preferentially inflating and deploying a lower region after the bag body has broken the seat skin.SOLUTION: A bag body 12 has a base chamber 20 which receives high-pressure gas when a shock is input and which is inflated within a side portion of a seatback; a first chamber 21 which is provided to be continuous with a front portion side of the base chamber 20 and into which the high-pressure gas is introduced via the base chamber 20; and a second chamber 22 which is provided to be continuous with the front portion side of the base chamber 20 and an upper portion side of the first chamber 21 and into which the high-pressure gas is introduced via the base chamber 20. The first chamber 21 is configured so that base cloths of front and rear surfaces of the bag body 12 are sewed up by breakable sewing threads 23 substantially along the longitudinal direction, and the second chamber 22 is configured so that the base cloths of front and rear surfaces of the bag body 12 are sewed up by breakable sewing threads 24 substantially along the vertical direction.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a side airbag device for a vehicle that protects an occupant seated on a seat by being deployed between the occupant and a vehicle body side portion.

  2. Description of the Related Art As an airbag device that protects an occupant seated on a seat, a side airbag device is known in which a bag body is deployed between an occupant and a vehicle body side when an impact is input. In this side airbag device, an inflator that generates gas and a folded bag body are housed in the side portion of the seat back, and when gas is introduced from the inflator to the bag body when an impact is input, the bag body The seat skin of the seat bag is broken and deployed forward so as to be interposed between the occupant and the vehicle body side.

In this type of side airbag device, the bag body needs to be quickly inflated and deployed when an impact is input, but when the gas pressure at the initial stage of injection from the inflator is high, the bag body breaks the seat skin and moves forward. The energy acting on the center side of the sheet from the bag body when inflated and expanded increases.
For this reason, as a countermeasure, a side airbag device has been devised so that the energy of the inflation and expansion of the bag can be attenuated at the timing when the bag breaks the seat skin and inflates and deploys forward (Patent Document 1). To 3).

  The side airbag apparatus described in Patent Documents 1 to 3 attenuates energy when the bag body breaks the sheet skin and inflates and deploys forward by folding the bag body, sewing, adding a tether, and the like.

  In particular, in the side airbag device described in Patent Document 1, the front and back base fabrics on the front side of the bag body are sewn in the vertical direction with breakable sutures. For this reason, in the side airbag device described in Patent Document 1, when gas is supplied from the inflator to the bag body when an impact is input, the rear region of the bag body is first inflated in the seat back, and then the bag body However, at the timing before and after breaking the sheet skin, the front region of the bag is deployed forward while breaking the sutures and attenuating energy.

JP 2008-247212 A Special table 2011-527965 gazette JP 2014-28545 A

  However, although the conventional side airbag device can reduce the energy acting on the seat center side by attenuating the expansion and deployment energy of the bag body at the timing before and after the bag body breaks the seat skin, It is not easy to strictly control the unfolding behavior of the bag after breaking the sheet skin.

  In the side airbag device, a lateral beam member such as an armrest may be disposed on the outer side of the seat, and when an impact is input, the bag body is inflated and deployed at an early stage in the space below the lateral beam member. There is a demand. For this reason, also in the conventional side airbag device, it is desired to inflate and deploy the lower region with priority after the bag body breaks the seat skin.

  In view of this, the present invention provides a side airbag that can attenuate the inflating and deploying energy of the bag body at the timing before and after breaking the seat skin, and can inflate and deploy the lower region in priority after the bag body breaks the seat skin. The device is to be provided.

  In order to solve the above problems, the side airbag device according to the present invention is provided with a bag body (for example, the bag body 12 of the embodiment) inside the side portion of the seat back (for example, the seat back 3 of the embodiment). In the side airbag device in which the bag body is inflated by receiving a high-pressure gas from an inflator (for example, the inflator 11 of the embodiment) when an impact is input, and the skin of the seat back is broken and deployed forward, The bag body receives a high-pressure gas from the inflator when an impact is input, and expands in the side portion of the seat back (for example, the base chamber 20 of the embodiment), and the front side of the base chamber at the time of expansion A first chamber (for example, the first chamber 21 of the embodiment) into which high-pressure gas is introduced via the base chamber, and at the time of expansion A second chamber (for example, the second chamber of the embodiment) that is connected to the front side of the base chamber and at a position on the upper side of the first chamber and into which high-pressure gas is introduced via the base chamber. 22), and the first chamber has a base fabric (for example, the base fabric 12a of the embodiment) on the front and back sides of the bag body by a breakable suture (for example, the suture 23 of the embodiment). The second chamber is sewn substantially along the vertical direction with a breakable suture (for example, the suture thread 24 of the embodiment). I did it.

  With this configuration, when an impact is input to the vehicle, the inflator generates a high-pressure gas, which is supplied to the base chamber, and the base chamber first expands in the side portion of the seat back. The high-pressure gas supplied to the base chamber is supplied to the first chamber and the second chamber on the front side via the base chamber. The skin of the seat back is broken when the first chamber or the second chamber is inflated and deployed forward while breaking the suture after the base chamber is expanded in the side portion of the seat back. For this reason, the energy of expansion and expansion of the bag body is attenuated at the timing before and after the sheet skin is broken. In addition, when the high-pressure gas is supplied to the first chamber and the second chamber via the base chamber, the high-pressure gas flows substantially forward from the base chamber. The suture of the first chamber portion that is started to break first, and then the suture of the second chamber portion that is sutured substantially along the front-rear direction starts to break. Therefore, after the sheet skin is broken, the lower first chamber is preferentially expanded and deployed.

  The first chamber is provided with a plurality of rows of suture portions (for example, the suture portion 23a of the embodiment) that are substantially along the front-rear direction, and the second chamber is substantially sutured along the vertical direction. A plurality of rows of suture portions (for example, the suture portion 23a of the embodiment) are provided in the front and rear, and the plurality of rows of suture portions of the first chamber and the second chamber are sutured by continuous sutures. Anyway.

  In this case, since the passages opening alternately in the opposite directions are formed in the respective regions of the first chamber and the second chamber by the suture, the internal pressure of the passage facing the gas inflow side is increased early, and the suture breaks. Easy to make early. Therefore, stable expansion and deployment of the first chamber and the second chamber can be obtained. Moreover, since it can sew on each base fabric of a 1st chamber and a 2nd chamber continuously at the time of manufacture, production efficiency can be improved.

  According to the present invention, since the first chamber and the second chamber are inflated and deployed while breaking the suture after the base chamber is inflated in the side portion of the seat back, the bag body is inflated at the timing before and after the seat skin is broken. The deployment energy can be attenuated, and the suture in the lower chamber of the first chamber whose suture direction is approximately the front-rear direction, and the suture of the upper chamber in the upper chamber whose suture direction is the substantially vertical direction Therefore, after the bag body breaks the sheet skin, the lower region can be preferentially inflated and deployed.

1 is a side view of a seat equipped with a side airbag device according to an embodiment of the present invention. It is sectional drawing corresponding to the II-II cross section of FIG. 1 of the sheet | seat equipped with the side airbag apparatus which concerns on one Embodiment of this invention. It is a front view of the bag of the side airbag device concerning one embodiment of this invention. 1 is a side view of a seat equipped with a side airbag device according to an embodiment of the present invention. 1 is a side view of a seat equipped with a side airbag device according to an embodiment of the present invention. 1 is a side view of a seat equipped with a side airbag device according to an embodiment of the present invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, unless otherwise specified, up and down and front and rear mean up and down and front and rear when attached to the vehicle body. In the figure, an arrow UP pointing upward and an arrow FR pointing forward are shown.

FIG. 1 is a view showing a side surface of a vehicle seat 1 employing a side airbag device 10 according to this embodiment, and FIG. 2 is a view showing a cross section corresponding to the II-II cross section of FIG. It is.
The seat 1 includes a seat cushion 2 that supports the buttocks and thighs of the seated person, and a seat back 3 that supports the back of the seated person. The side airbag device 10 is housed inside the side edge of the seat back 3 on the vehicle body side (for example, the door 4 side). Reference numeral 5 in the drawing denotes a cross beam member such as an armrest that extends substantially along the front-rear direction on the side of the vehicle body.

  As shown in FIG. 2, the side airbag device 10 includes an inflator 11 that generates a high-pressure gas when an impact is input to the vehicle, a high-pressure gas supplied from the inflator 11, and a side portion of the seat back 3. And a bag body 12 that inflates and deploys from the front side to the front side. The bag body 12 is housed in the airbag case 13 together with the inflator 11 in a state of being folded in a predetermined shape, and these are housed in the seat back 3 as the airbag unit 14.

  The airbag case 13 that forms the outer cover of the airbag unit 14 is formed in a vertically long rectangular shape, and closes the case body 13A disposed on the seat frame 15 side and the opening on the vehicle exterior side of the case body 13A. It is comprised by the case cover 13B. The case cover 13B is hinged to the case main body 13A on the rear end side, and the front side is opened around the hinge portion by the expansion of the bag body 12 by the gas generated by the inflator 11. The airbag unit 14 attached to the seat frame 15 is covered with a seat skin 16 around the airbag unit 14, but the seat skin 16 on the front side of the airbag unit 14 is broken along the vertical direction. A seam is formed by a suture that becomes the boundary a. The breaking boundary a is broken by receiving the deployment pressure of the bag body 12 of the side airbag device 10. In addition, the code | symbols 17a and 17b in FIG. 2 are the power cloth which forms the expansion | deployment path | route of the bag body 12 which goes to the fracture | rupture boundary part a at the time of expansion | swelling expansion | deployment of the bag body 12, and 18 is a cushioning material of the seat back 3. .

FIG. 3 is a front view of the bag body 12 before being folded and stored in the airbag case 13.
The bag body 12 has two base cloths 12a on the front and back sides, and is formed into a bag shape by sewing the outer peripheral edge of the base cloth 12a on the front and back sides with a suture thread. A gas inlet (not shown) from the inflator 11 is provided on the side surface near the rear portion of the bag body 12, and the high-pressure gas introduced into the bag body 12 is supplied to the side surface near the front portion of the bag body 12. A vent hole 19 for finally discharging to the outside is provided.

  In addition, the substantially rear half region of the bag body 12 is a base chamber 20 that first expands in the side portion of the seat back 3 when gas is introduced from the inflator 11. The inflator 11 is connected to the base chamber 20.

  A first chamber 21 and a second chamber 22 are provided in a portion of the bag body 12 that is on the front side of the base chamber 20 when inflated. The first chamber 21 is disposed below the front portion of the base chamber 20, and the second chamber 22 is disposed at a position on the front portion side of the base chamber 20 and on the upper side of the first chamber 21. The high pressure gas from the inflator 11 is introduced into the first chamber 21 and the second chamber 22 via the base chamber 20. The first chamber 21 is disposed so as to expand at a position below the cross beam member 5 on the side of the vehicle body.

  In the first chamber 21, the base fabric 12 a on the front and back of the bag body 12 is sewn with a breakable suture thread 23. The stitched portions 23a formed by the suture thread 23 extend along the front-rear direction of the first chamber 21, and the first chamber 21 is provided with a plurality of rows of stitched portions 23a in the vertical direction. The plurality of rows of stitched portions 23 a are continuously formed by continuous sutures 23. That is, the plurality of rows of stitching portions 23a are continuous by alternately shifting the sewing position in the up-down direction on one end side and the other end side in the front-rear direction of the first chamber 21.

  In the second chamber 22, the base fabric 12 a on the front and back of the bag body 12 is sewn with a breakable suture thread 24. Suture portions 24a formed by the suture thread 24 are substantially along the vertical direction of the second chamber 22, and the second chamber 22 is provided with a plurality of rows of suture portions 24a extending in the front-rear direction. The plurality of rows of stitched portions 24 a are continuously formed by a continuous suture thread 24. That is, the plurality of rows of stitching portions 24a are continuous by alternately shifting the sewing position in the front-rear direction on one end side and the other end side of the second chamber 22 in the up-down direction.

4, 5, and 6 are diagrams illustrating the deployment behavior of the bag body 12 of the side airbag device 10 when an impact is input.
Next, the operation of the side airbag device 10 will be described with reference to FIGS. 4, 5, and 6.

  When an impact is input to the vehicle, the inflator 11 generates high-pressure gas, and the gas is supplied to the base chamber 20 of the bag body 12. As a result, as shown in FIG. 4, the base chamber 20 first expands in the side portion of the seat back 3. The gas supplied to the base chamber 20 is supplied to the first chamber 21 and the second chamber 22 via the base chamber 20.

  When the first chamber 21 and the second chamber 22 are inflated and deployed forward while breaking the sutures 23 and 24 after the base chamber 20 is inflated in the side portion of the seat back 3, Break at a. The energy for inflating and expanding the bag body 12 is attenuated by breaking the sutures 23 and 24 at a timing before and after the bag body 12 breaks the sheet skin 16.

  In addition, since the bag body 12 has a structure in which high-pressure gas flows substantially forward via the base chamber 20, the high-pressure gas is supplied toward the first chamber 21 and the second chamber 22. Then, the suture 23 of the first chamber 21 portion that is sutured substantially along the front-rear direction starts to break first, and then the suture of the second chamber 22 portion that is sutured substantially along the front-rear direction thereafter. 24 begins to break. For this reason, after the sheet skin 16 is broken, the bag body 12 first expands and deploys forward while the suture chamber 23 is broken by the first chamber 21 portion on the lower side as shown in FIG. become. As a result, at the lower position of the cross beam member 5, the first chamber 21 portion of the bag 12 is rapidly deployed between the seated person's waist and the side of the vehicle body.

  After the first chamber 21 starts inflating and deploying, the second chamber 22 portion on the upper side of the bag body 12 inflates and deploys forward while breaking the suture thread 24 as shown in FIG. Become. As a result, at the position above the lower end of the cross beam member 5, the second chamber 22 portion of the bag body 12 expands between the upper body of the seated person and the side of the vehicle body.

As described above, in the side airbag device 10 according to this embodiment, the first chamber 21 and the second chamber 22 break the sutures 23 and 24 after the base chamber 20 is inflated in the side portion of the seat back 3. However, since the sheet is inflated and deployed, the energy for inflating and deploying the bag body 12 can be reliably attenuated at the timing before and after the sheet skin 16 is broken.
Further, in addition to this, the side airbag device 10 has the suture 23 of the lower first chamber 21 in which the stitching direction is substantially the front-rear direction, and the upper side first suture 21 in which the stitching direction is substantially the vertical direction. Since it is easier to break than the suture thread 24 of the two chambers 22, after the bag body 12 breaks the sheet skin 16, the first chamber 21 on the lower side can be preferentially inflated and deployed.

Furthermore, in the side airbag device 10 according to this embodiment, a plurality of rows of stitched portions 23a of the first chamber 21 are continuously formed by the continuous suture 23, and a plurality of rows of the second chamber 22 are formed. Similarly, the stitching portion 24a is continuously formed in the entire region by the continuous suture thread 24. For this reason, the first chamber 21 portion and the second chamber 22 portion have passages that open alternately in the opposite direction by the sutures 23 and 24, and the internal pressure of the passage facing the portion into which the gas flows is increased early. It will be. As a result, breakage of the sutures 23 and 24 is easily induced, and stable expansion and deployment of the first chamber 21 and the second chamber 22 can be obtained.
Further, the side airbag device 10 according to this embodiment can be sewn efficiently because the stitching portions 23a and 24a of the first chamber 21 and the second chamber 22 are continuously formed. Efficiency can also be increased.

  In addition, this invention is not limited to said embodiment, A various design change is possible in the range which does not deviate from the summary.

DESCRIPTION OF SYMBOLS 3 ... Seat back 10 ... Side airbag apparatus 11 ... Inflator 12 ... Bag body 12a ... Base cloth 20 ... Base chamber 21 ... 1st chamber 22 ... 2nd chamber 23, 24 ... Suture thread 23a, 24a ... Suture part

Claims (2)

A side airbag device in which a bag body is provided inside a side portion of a seat back, and when a shock is input, the bag body receives a high-pressure gas from an inflator to inflate and breaks the skin of the seat back and deploys forward In
The bag is
A base chamber that receives high-pressure gas from the inflator when an impact is input and expands in a side portion of the seat back;
A first chamber connected to the front side of the base chamber at the time of expansion and into which high-pressure gas is introduced via the base chamber;
A second chamber connected to a position on the front side of the base chamber at the time of expansion and on the upper side of the first chamber and into which a high-pressure gas is introduced via the base chamber;
In the first chamber, the base fabric on the front and back of the bag body is sutured substantially along the front-rear direction by a breakable suture,
In the second chamber, the base fabric on the front and back of the bag body is sewn substantially along the vertical direction by a breakable suture. The first chamber is provided with a plurality of rows of stitched portions by the sutures substantially along the front-rear direction,
The second chamber is provided with a plurality of rows of suture portions by the suture thread substantially along the vertical direction,
2. The side airbag device according to claim 1, wherein the plurality of rows of stitched portions of the first chamber and the second chamber are stitched by continuous sutures.

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