JP5160845B2 - Side airbag device for vehicle - Google Patents

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 an airbag 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 airbag bag body are housed in the side portion of the seat back, and gas is introduced from the inflator to the airbag bag body when an impact is input. The airbag breaks the seat skin of the seat back and deploys between the occupant and the side of the vehicle body.

By the way, in this type of side airbag device, the seam or the like by the sewing thread of the seat skin becomes a fracture boundary portion when the airbag is deployed, but when the portion near the fracture boundary portion of the seat skin extends when the airbag is deployed, It becomes difficult to break as desired at the break boundary.
For this reason, as a side airbag device to cope with this, the boundary edge facing the fracture boundary of the seat skin and the support member on the seat frame side are coupled with a restraining force cloth (tension applying means), and when the airbag is deployed, There has been devised one in which tension is applied in the vicinity of the break boundary portion by a binding cloth (see Patent Document 1).

On the other hand, as a side airbag device, a separate lower chamber that deploys to the side of the occupant's waist and an upper chamber that deploys to the side of the upper body including the occupant's chest are provided, and each chamber is different when an impact is input The thing which develops with a characteristic is devised (refer patent document 2).
This side airbag device is designed so that the internal pressures of the lower chamber and the upper chamber at the time of deployment differ from each other in consideration of the characteristics of each part of the occupant's body, and the amount of gas flowing into the lower chamber from the inflator The amount of gas flowing into the upper chamber is also different.
JP 2003-127815 A JP 2000-177527 A

  In the side airbag device including the upper chamber and the lower chamber as described above, it is necessary to quickly deploy the lower chamber from the occupant's waist to the side of the thigh at the initial stage of deployment of the airbag bag body. At present, even in such a side airbag device, it is considered to promptly break the break boundary portion of the seat skin using the binding cloth.

  However, when the above-described technique is applied as it is, since another binding force cloth is connected with the same width to both edge portions of the sheet skin sandwiching the fracture boundary portion therebetween, the airbag bag body is expanded. In the initial stage, almost equal stress acts on any part of the fracture boundary portion, and it is not always possible to obtain a fracture from the lower end side, which is desirable in rapidly developing the lower chamber.

  Therefore, the present invention is intended to provide a vehicle side airbag device capable of promptly rupturing from the lower end side of the rupture boundary portion of the seat skin and rapidly deploying the lower chamber from the lower end side. .

The invention according to claim 1, which solves the above problem, includes a lower chamber (for example, a lower chamber 12 in an embodiment described later) for restraining the side of the occupant's waist seated on the seat, and an occupant's chest. An airbag bag body (for example, an airbag bag body 6 in an embodiment described later) having an upper chamber (for example, an upper chamber 11 in an embodiment described later) that restrains the side portion of the upper body, and the airbag bag body An inflator (for example, an inflator 7 in an embodiment to be described later) that introduces gas and expands and deploys, a boundary edge that faces a fracture boundary portion (for example, a fracture boundary portion a in an embodiment to be described later), and a seat frame ( For example, the support member on the side of the seat frame 25 in the embodiment described later (for example, the outer support wire 30 and the inner side in the embodiment described later) Tension applying means for connecting the holding wire 31 and the second inner support wire 33 and applying tension to the boundary edge (for example, upper side tension applying means 34 and lower side tension applying means 35 in the embodiments described later). ), The tension applying means is provided in correspondence with the upper chamber and the lower chamber, respectively, and the lower side tension applying means is provided at the inner boundary in the vehicle width direction of the seat skin. An inner restraint force cloth (for example, an inner restraint force cloth 35A in an embodiment described later) for connecting the edge portion and the support member, and an outer restraint for connecting the support edge to the boundary edge portion on the outer side in the vehicle width direction of the seat cover. And the inner restraint of the lower side tension applying means with respect to the boundary edge of the sheet skin The height of the lower end of the connecting portion of the cloth and the outer restraint webbing substantially aligned with, and thereby set the same as the height of the lower vicinity of the expansion area of the lower chamber, the connection portion length of said inner restraint webbing and the seat skin the is characterized in that shorter than the connecting portion length of the outer restraining webbing and the seat skin.
As a result, when the lower chamber expands due to gas introduction from the inflator at the time of impact input, a force is applied to the break boundary portion of the seat skin via the inner restraint force cloth and the outer restraint force cloth of the lower side tension applying means. At this time, since the inner restraint force cloth and the outer restraint force cloth are connected to the boundary edge portion of the sheet skin with different lengths in a state where the lower ends of both are substantially coincident, Breaking stress acts around the lower end of the portion corresponding to the lower chamber.

According to a second aspect of the present invention, in the vehicle side airbag device according to the first aspect, the upper side tension applying means is connected to the inner edge of the seat skin in the vehicle width direction and the support member. A restraining force cloth (for example, an inner restraining force cloth 34A in an embodiment described later) and an outer restraining force cloth (for example, in an embodiment described later) connecting the outer edge of the seat skin in the vehicle width direction and the support member. Outer restraint force cloth 34B), and the height of the lower end of the connection portion of the inner restraint force cloth of the upper side tension applying means and the connection portion of the outer restraint force cloth with respect to the boundary edge portion of the seat skin is substantially matched. together, characterized in that the inner binding cloth and sheet joined portion length of epidermis of the upper side tensioning means is shorter than the connecting portion length of the outer restraining webbing and seat skin of the upper side tensioning means.
As a result, when the upper chamber expands due to gas introduction from the inflator at the time of impact input, a force is applied to the break boundary portion of the seat skin through the inner restraint force cloth and the outer restraint force cloth of the upper side tension applying means. At this time, since the inner restraint force cloth and the outer restraint force cloth are connected to the boundary edge portion of the sheet skin with different lengths in a state where the lower ends of both are substantially coincident, Breaking stress acts around the lower end of the portion corresponding to the upper chamber.

According to a third aspect of the present invention, in the vehicle side airbag device according to the first aspect, the upper side tension applying means is an inner side connecting the boundary edge of the seat skin in the vehicle width direction and the support member. A restraining force cloth; and an outer restraining force cloth that connects the outer edge of the seat skin in the vehicle width direction and the support member; and the inner restraining force cloth and the seat skin of the upper side tension applying means. And the connecting portion between the outer restraining force cloth of the lower side tension applying means and the sheet skin are partially overlapped in the vertical direction.
As a result, when the lower chamber expands due to gas introduction from the inflator at the time of impact input, a force is applied to the fracture boundary corresponding to the lower chamber via the inner restraint force cloth and the outer restraint force cloth of the lower side tension applying means, When the chamber expands, a force is applied to the fracture boundary corresponding to the upper chamber via the inner restraining force cloth and the outer restraining force cloth of the upper tension applying means. Also, at this time, the connecting portion between the outer restraining force cloth and the sheet skin of the lower side tension applying means and the connecting portion between the inner restraining force cloth and the sheet skin of the upper side tension applying means partially overlap in the vertical direction. Therefore, the rupture stress transmitted to one rupture boundary portion on the upper chamber side and the lower chamber side is transmitted to the other through the overlap portion.

According to a fourth aspect of the present invention, in the vehicle side airbag device according to the second or third aspect of the present invention, the hard cloth stretchable direction of the upper side tension applying means is set to a first direction perpendicular to the seat frame. And the direction of difficulty of expansion and contraction of the restraining force cloth of the lower side tension applying means is set to a second direction inclined downward with respect to the first direction.
Thereby, the restraining force of the restraining force cloth of the upper side tension applying means acts effectively in the direction perpendicular to the seat frame, and the restraining force of the restraining force cloth of the lower side tension applying means is perpendicular to the seat frame. It works effectively in a downwardly inclined direction.

According to a fifth aspect of the present invention, in the vehicle side airbag device according to any one of the second to fourth aspects, the support member that supports the inner restraint cloth of the upper side tension applying means on the seat frame ( For example, apart from the inner support wire 31 in the embodiment described later, a support member (for example, the second inner support wire 33 in the embodiment described later) that supports the inner restraint cloth of the lower tension applying means on the seat frame. ) Is provided.
As a result, the inner restraint force cloth of the upper side tension applying means and the inner restraint force cloth of the lower side tension applying means are supported by the seat frame via separate support members.

According to the first aspect of the present invention, the upper side tension applying means corresponding to the upper chamber and the lower side tension applying means corresponding to the lower chamber are provided, and the inner side restraint of the lower side tension applying means with respect to the boundary edge of the sheet skin the height of the lower end of the connecting portion of the webbing and the outer restraint webbing substantially aligned with, and thereby set the same as the height of the lower vicinity of the expansion area of the lower chamber, a connection length of the inner restraint webbing and the seat skin Since the length of the connecting portion between the outer restraining force cloth and the seat outer cover is shorter than the length of the lower chamber, when the lower chamber is inflated, the breaking stress is concentrated at the lower end of the opposing breaking boundary between the inner restraining force cloth and the outer restraining force cloth, It can be quickly deployed from the lower end side.

According to the second aspect of the present invention, the height of the lower end of the connecting portion between the inner restraining force cloth and the outer restraining force cloth of the upper side tension applying means with respect to the boundary edge portion of the seat skin is made to substantially coincide with the upper side tension. since the inner binding cloth and sheet joined portion length of epidermis imparting means it is shorter than the connecting portion length of the outer restraining webbing and seat skin of the upper side tensioning means, upon inflation of the upper chamber, the inner restraint webbing and outer The stress can be concentrated on the lower end of the opposing fracture boundary of the restraining force cloth, so that the upper chamber can be rapidly deployed from the lower end side. In this case, the upper chamber can start to expand forward without being affected by the lower chamber side in the early stage of expansion, and the relatively large upper chamber is directed from the front to the upper side from the middle stage of the expansion to the completion of the expansion. Can be deployed quickly.

  According to the third aspect of the present invention, the connecting portion between the outer restraining force cloth and the sheet skin of the lower side tension applying means, and the connecting portion between the inner restraining cloth and the sheet skin of the upper side tension applying means are partially in the vertical direction. Therefore, the rupture stress transmitted to one rupture boundary on the upper chamber side and the lower chamber side is transmitted to the other through the overlap part, and the rupture at the rupture boundary part on the side where rupture is delayed Can be encouraged. Therefore, it is possible to prevent one of the lower chamber and the upper chamber from opening too much due to a pressure difference, or from greatly shifting the opening timing.

  According to the fourth aspect of the present invention, the difficulty expansion / contraction direction of the restraining force cloth of the upper side tension applying means is set to the first direction perpendicular to the seat frame, and the difficulty of the restraining force cloth of the lower side tension applying means is set. Since the expansion / contraction direction is set to the second direction inclined downward with respect to the first direction, the deployment directions of the upper chamber and the lower chamber can be promoted to the first direction and the second direction.

  According to the invention described in claim 5, since the inner restraint force cloth of the upper side tension applying means and the inner restraint force cloth of the lower side tension applying means are supported on the seat frame via separate support members, A large load acting on each inner restraint force cloth can be reliably supported by the seat frame.

  Embodiments of the present invention will be described below with reference to the drawings. In each embodiment described below, the same parts are denoted by the same reference numerals, and redundant description is omitted. Further, in the following description, unless otherwise specified, up and down and front and rear mean up and down and front and rear in a state of being attached to the vehicle body.

First, the first embodiment shown in FIGS. 1 to 8 will be described.
FIG. 1 shows the interior of a vehicle to which a side airbag device 1 according to the present invention is applied. As shown in the figure, the side airbag device 1 is housed in the side edge portion on the door 5 side of each seat back 4 of the driver seat side seat 2A and passenger seat side seat 2B. The side airbag device 1 includes an airbag bag body 6 that is deployed from the side of the seat back 4 between the occupant and the side of the vehicle body at the time of impact input such as a side collision.

  FIG. 2 shows the airbag bag body 6 deployed from the side portion of the seat back 4 to the front side of the vehicle body. As shown in FIG. 1, the side airbag device 1 includes an inflator 7 that generates a gas to be introduced into the airbag bag body 6 by detecting an impact in addition to the airbag bag body 6. And the airbag bag body 6 is accommodated in the airbag case 8 together with the inflator 7 in a state of being folded into a predetermined shape, and these are accommodated in the side portion of the seat bag 4 on the door 5 side. .

  Here, when the airbag bag body 6 is described with the unfolded state shown in FIG. 2, the airbag bag body 6 is formed into a bag shape of a vertically long ellipse by sewing a plurality of base fabrics in a superposed state. In order to introduce the gas discharged from the inflator 7 into the upper and lower two-way paths in the inner region by sewing, a gas introduction passage 10 and an upper chamber 11 and a lower chamber 12 that are inflated and deployed by introducing gas are separated. .

Specifically, a longitudinally long gas introduction passage 10 is formed along the rear edge portion of the airbag bag body 6, and a lower side of the gas introduction passage 10 is provided on the waist of the occupant seated on the seats 2A and 2B. A lower chamber 12 for constraining the side region is formed, and an upper chamber 11 for constraining the side region of the upper body around the chest of the occupant seated on the seats 2A and 2B is formed above the gas introduction passage 10. Is formed. The lower chamber 12 and the upper chamber 11 are set so as to develop at different internal pressures.
In FIG. 2, 14 and 15 are bulge restricting portions that restrict the bulging of the airbag bag body in the width direction, and 20 is a vent hole that suppresses an increase in gas pressure in the upper chamber.

  FIG. 3 shows a folded state of the airbag bag body 6. As shown in the figure, the airbag bag body 6 is folded by, for example, roll folding. The upper side of the airbag bag body 6 including the upper chamber 11 is wound substantially horizontally from the front end side toward the rear, and the lower side of the airbag bag body 6 including the lower chamber 12 is directed from the front end toward the rear. Rolled up diagonally. Therefore, when the airbag bag body 6 is deployed, the upper chamber 11 is deployed almost horizontally toward the front side, and the lower chamber 12 is deployed obliquely downward and forward toward the front side.

FIG. 4 shows the airbag unit 9 with a schematic cross section of the side portion of the seat back 4, and FIGS. 5 and 6 show the airbag unit 9 together with a seat frame 25 on the outer side in the vehicle width direction. is there.
The airbag case 8 that forms the outer skin of the airbag unit 9 is formed in a vertically long rectangular shape, and as shown in FIGS. 5 and 6, a case body 26 disposed on the seat frame 25 side, and the case body The bag cover 27 closes the opening on the outside of the vehicle 26. The bag cover 27 is hinged to the case body 26 on the rear end side, and the airbag bag body 6 is expanded by the gas generated by the inflator 7 so that the front side is opened around the hinge portion. The airbag unit 9 attached to the seat frame 25 is covered with a seat skin 28 as shown in FIG. 4, but the seat skin 28 on the front side of the airbag unit 9 has upper and lower sides. A seam is formed by a sewing thread that becomes the breaking boundary a substantially along the direction. Like the airbag case 8, the breaking boundary a is broken by receiving the deployment pressure of the airbag bag body 6.

  The rear end of the seat frame 25 is joined to the upper and lower ends of a strut wire 29 having a large outer diameter, and the middle portion of the strut wire 29 is bent and extended toward the inner side in the vehicle width direction. End portions of the outer support wire 30 and the inner support wire 31 are locked to the extending portion. Both ends of the outer support wire 30 are locked to the support frame 29, and an intermediate portion extends around the rear side of the seat frame 25 and extends outward in the vehicle width direction. An upper support portion 30a that extends substantially along the extending direction of the frame 25 and a lower support portion 30b that is inclined inward in the vehicle width direction with respect to the upper support portion 30a are provided. Both end portions of the inner support wire 31 are similarly locked to the support frame 29, and the intermediate portion passes through the inner side in the vehicle width direction of the seat frame 25 to the front side. Further, the lower end portion of the outer support wire 30 is also directly supported by the rear surface of the seat frame 25 via a bracket 32 as shown in FIG. Furthermore, the other end of the second inner support wire 33 whose one end is supported and fixed to the bracket 32 on the rear surface side of the seat frame 25 is locked to the lower end of the inner support wire 31. The second inner support wire 33 is formed in a substantially U shape, and is arranged so that the intermediate portion wraps around the outside in the vehicle width direction of the seat frame 25.

  By the way, in the part corresponding to the development region of the upper chamber 11 and the part corresponding to the development region of the lower chamber 12 in the fracture boundary part a of the sheet skin 28, both sides of the sheet skin 28 facing the fracture boundary part a are provided. An upper side tension applying means 34 and a lower side tension applying means 35 for applying tension to the boundary edge are provided respectively. In the following, for convenience of explanation, the inner and outer boundary edges corresponding to the development region of the upper chamber 11 are referred to as “upper inner edge” and “upper outer edge”, respectively. The boundary edges on the inner and outer sides in the vehicle width direction corresponding to the development region of the chamber 12 are referred to as “lower inner edge” and “lower outer edge”, respectively.

The upper-side tension applying means 34 includes an inner restraining force cloth 34A that connects the inner support wire 31 and the upper inner edge of the fracture boundary a, an upper support 30a of the outer support wire 30, and an upper outer edge of the fracture boundary a. The lower side tension applying means 35 is configured by an inner binding force cloth 35A that connects the second inner support wire 33 and the lower inner edge of the fracture boundary portion a, It is comprised by the outer restraint force cloth 35B which connects the lower support part 30b of the outer side support wire 30, and the lower outer edge part of the fracture | rupture boundary part a.

  The outer restraint force cloths 34B and 35B of the upper side tension applying means 34 and the lower side tension applying means 35 are spread from the root side coupled to the outer support wire 30 toward the tip end side coupled to the sheet skin 28. It is formed in a substantially fan shape and extends so as to cover the outside of the bag cover 27 of the airbag case 8. Further, the inner restraint force cloth 34A of the upper side tension applying means 34 is formed to have a substantially constant width, and the inner restraint force cloth 35A of the lower side tension applying means 35 is formed to be tapered from the root side toward the tip side. Yes.

  In the lower-side tension applying means 35, the connecting portion between the outer restraining force cloth 35B and the seat skin 28 and the connecting portion between the inner restraining force cloth 35A and the seat skin 28 are substantially coincident with each other, and each restraining force is the same. The length of the connecting portion between the cloths 35B and 35A and the sheet skin 28 is set longer for the outer restraining force cloth 35B than for the inner restraining force cloth 35A. Similarly, in the upper-side tension applying means 34, the lower end positions of the connecting portion between the outer restraining force cloth 34B and the seat cover 28 and the connecting portion between the inner restraining force cloth 34A and the sheet cover 28 are substantially coincident with each other, and The connecting length of the force cloths 34B and 34A with the sheet skin 28 is set longer for the outer restraint force cloth 34B than for the inner restraint force cloth 34A. In other words, the lower side tension applying means 35 and the upper side tension applying means 34 are both lower and inner corresponding restraining force cloths 35B and 35A, and 34B and 34A are the lower end positions of the connecting portion with the seat skin 28, respectively. Are substantially matched, only a part of the connecting portion with the seat skin 28 overlaps in the vertical direction. 5 and 6, reference numeral 38 denotes a notch for concentrating the breaking stress on the upper and lower sides of the outer binding force cloth 34B.

Further, as shown in FIG. 7, each of the restraining force cloths 34A and 34B of the upper side tension applying means 34 has a first direction in which a difficult expansion / contraction direction determined by the weaving direction and weaving method of the fibers is perpendicular to the extending direction of the seat frame 25. 1 direction Da is set. This first direction Da substantially coincides with a desired initial deployment direction of the upper chamber 11.
On the other hand, as shown in FIG. 8, each of the restraining force cloths 35A and 35B of the lower side tension applying means 35 has a difficult expansion / contraction direction determined by a fiber folding direction and a weaving method, and the front side with respect to the first direction Da. A second direction Db inclined downward is set. This second direction Db substantially coincides with the desired initial deployment direction of the lower chamber 12.

  In the above configuration, when an impact such as a side collision of the vehicle is input and the inflator 7 generates gas, the gas is introduced into the upper chamber 11 and the lower chamber 12 through the gas introduction passage 10 of the airbag bag body 6. become. Thus, when gas is introduced into the upper chamber 11 and the lower chamber 12, both the chambers 11, 12 open the case body 26 and the bag cover 27 of the airbag case 8 and bulge forward, and are developed by both the chambers 11, 12. The sheet skin 28 is broken by the pressure and the tension of the binding force cloths 34A, 34B, 35A, 35B acting on the edge of the breaking boundary portion a of the sheet skin 28.

  At this time, the gas pressure in the lower chamber 12 rises faster than the gas pressure in the upper chamber 11, so that the lower chamber 12 tries to jump out from the front part before the upper chamber 11. Since the inner side restraining force cloth 35A and the outer side restraining force cloth 35B on the 35 side are connected to the seat skin 28 so that only a part of the vicinity of the lower portion overlaps, the breaking stress due to the restraining force cloths 35A and 35B is the breaking boundary. It concentrates near the lower part of the development area of the lower chamber 12 of the part a. Accordingly, the break boundary portion a is first broken near the lower portion of the development region of the lower chamber 12, and the lower chamber 12 is developed toward the lower front side while expanding the break of the break boundary portion upward. Become.

  Further, when the upper chamber 11 tries to jump forward, it is the same as the overlapping connection portion (the lower end of the development region of the upper chamber 11) on the sheet skin 28 side of each of the binding cloths 34A, 34B of the upper tension applying means 34. As a result, the upper chamber 11 first breaks at the position corresponding to the lower end of the development region of the break boundary portion a, and the break of the break boundary portion a is expanded upward while the breakage stress is concentrated on the front side. It expands from the upper side to the upper side.

Therefore, in the side airbag device 1, the lower chamber 12 can be quickly deployed forward and downward from the lower end side in the initial stage of inflation, and the side of the occupant's waist can be restrained in an early pressed state.
Further, since the upper chamber 11 can also be quickly deployed forward from the lower end side without being affected by the deployment of the lower chamber 12 at the initial stage of expansion, the upper body of the occupant is kept in a predetermined posture from the side. It can be restrained promptly. Furthermore, although the upper chamber 11 is a relatively large one that expands from the front to the upper side, in this side airbag device 1, the fracture boundary portion a is gradually broken from the lower end side toward the upper side, The upper chamber 11 can be rapidly expanded from the front to the upper side from the middle stage of expansion to the completion of expansion.

  Further, in the case of the side airbag device 1, the difficult expansion / contraction direction of the restraining force cloths 34 </ b> A and 34 </ b> B of the upper side tension applying unit 34 is set to the first direction Da perpendicular to the seat frame 25, and the lower side tension applying unit Since the hard-to-stretch directions of the 35 binding force cloths 35A and 35B are set to the second direction Db inclined forward and downward with respect to the first direction Da, the deployment direction of the upper chamber 11 is set to the front side. The deployment direction of the lower chamber 12 can be surely urged diagonally forward and downward, respectively.

  Further, in the side airbag device 1 of this embodiment, the inner restraint force cloth 34 </ b> A of the upper side tension applying means 34 is supported by the seat frame 25 via the inner support wire 31, and the inner side restraint means 35 is restrained by the inner side. Since the webbing 35A is supported by the seat frame 25 via the second inner support wire 33, a large force acting on the inner restraint webbings 34A and 35A is generated from the appropriate direction by the separate wires 31 and 33. It can be reliably supported. The seat unit 25 side of the airbag unit 9 has no escape space for the inflation pressure, and a large force tends to act on the inner restraint force cloths 34A, 35A. By adopting this structure, the inner restraint force cloth 34A, A large force acting on 35A can be reliably supported by the seat frame 25.

FIG. 9 shows a second embodiment of the present invention. The basic configuration of the side airbag device 101 of this embodiment is substantially the same as that of the first embodiment, but only the inner restraint force cloth 134A of the upper side tension applying means 134 is different.
That is, the inner restraining force cloth 134A is formed in a divergent shape from the root portion side coupled to the inner support wire 31 toward the distal end side, and the upper end side of the connection portion with the sheet skin on the distal end side is the upper side tension applying means 134. The outer restraint force cloth 34B partially overlaps the lower end, and the lower end side partially overlaps the upper end of the outer restraint force cloth 35B of the lower side tension applying means 35.

In the case of the side airbag device 101, a connection portion between the upper side tension applying means 134 and the sheet skin of the inner restraint force cloth 134 </ b> A and a connection portion between the lower side tension applying means 35 and the outer restraint force cloth 35 </ b> B are provided. Since it overlaps in the vertical direction, the same basic effects as those of the first embodiment can be obtained, and the fracture input from one of the upper side tension applying means 134 and the lower side tension applying means 35 There is an advantage that stress can be transmitted to the fracture region on the other side.
Accordingly, when the break at the lower end of the break boundary corresponding to the upper chamber is delayed, the break at the lower end can be promoted, and conversely, when the break at the upper end of the break boundary corresponding to the lower chamber is delayed. , It is possible to urge the upper end to break. As a result, it is possible to prevent one of the lower chamber and the upper chamber from opening too much due to a pressure difference, or the opening timing from deviating greatly. This is particularly effective when the amount of gas flowing into the lower chamber in the initial stage is larger than that of the upper chamber.

  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.

1 is a partial perspective view of a vehicle interior showing a first embodiment of the present invention. The front view at the time of the expansion | deployment deployment of the airbag bag body of the embodiment. The front view which shows the folded state of the airbag bag body of the embodiment. The side view of the airbag unit when showing the same embodiment and showing a seat back with a schematic cross section. The typical perspective view which looked at the air bag unit and seat frame of the embodiment from the vehicle body back side. The figure which looked at the air bag unit and seat frame of the embodiment from the body front side. The figure which shows the image of the folding direction of the fiber of the restraint force cloth of the embodiment. The figure which shows the image of the folding direction of the fiber of the restraint force cloth of the embodiment. The figure which looked at the airbag unit and seat frame of the 2nd Embodiment of this invention from the vehicle body front side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Side airbag apparatus 6 ... Air bag body 7 ... Inflator 11 ... Upper chamber 12 ... Lower chamber 25 ... Seat frame 28 ... Seat skin 30 ... Outer support wire (support member)
31 ... Inner support wire (support member)
33 ... Second inner support wire (support member)
34, 134 ... upper side tension applying means 35 ... lower side tension applying means 34A, 35A, 134A ... inner restraint force cloth 34B, 35B ... outer restraint force cloth

Claims (5)

An airbag bag body having a lower chamber for restraining the side of the waist of the occupant seated on the seat, and an upper chamber for restraining the side of the upper body including the chest of the occupant;
An inflator for introducing and inflating gas into the airbag bag body;
A tension applying means for connecting the boundary edge facing the fracture boundary of the seat skin and the support member on the seat frame side, and applying tension to the boundary edge;
In a side airbag device of a vehicle provided with
The tension applying means is provided corresponding to the upper chamber and the lower chamber,
The lower side tension applying means is connected to the inner edge of the seat skin in the vehicle width direction and the support member, and the outer edge of the seat skin in the vehicle width direction is connected to the support member. An outer restraint force cloth
The height of the lower end of the connecting portion between the inner restraining force cloth and the outer restraining force cloth of the lower side tension applying means with respect to the boundary edge portion of the sheet skin is substantially matched, and the height near the lower portion of the development region of the lower chamber and it sets the same, the side airbag device for a vehicle, wherein a connecting portion length of said inner restraint webbing and seat upholstery made shorter than the connecting portion length of the outer restraining webbing and the seat skin. The upper side tension applying means is connected to the inner edge of the seat skin in the vehicle width direction and the support member, and the outer edge of the seat skin in the vehicle width direction is connected to the support member. An outer restraint force cloth
The inner restraint force cloth of the upper side tension applying means and the lower end of the connection part of the outer restraint force cloth with respect to the boundary edge portion of the sheet skin are substantially matched, and the inner restraint force cloth of the upper side tension applying means is vehicle side airbag apparatus according to claim 1, characterized in that shorter than the connecting portion length of the outer restraining webbing and seat skin of the upper side tensioning means a connection length of the seat skin. The upper side tension applying means is connected to the inner edge of the seat skin in the vehicle width direction and the support member, and the outer edge of the seat skin in the vehicle width direction is connected to the support member. An outer restraint force cloth
The inner restraint force cloth and sheet skin connecting portion of the upper side tension applying means, and the outer restraint force cloth and sheet skin connecting portion of the lower side tension applying means are partially overlapped in the vertical direction. The vehicle side airbag device according to claim 1.   The hard stretch direction of the restraining force cloth of the upper side tension applying means is set to a first direction perpendicular to the seat frame, and the hard stretch direction of the restraining force cloth of the lower side tension applying means is set to the first direction. 4. The side airbag device for a vehicle according to claim 2, wherein the side airbag device is set in a second direction inclined downward with respect to the direction.   In addition to the support member for supporting the inner restraint force cloth of the upper side tension applying means on the seat frame, a support member for supporting the inner restraint force cloth of the lower side tension applying means on the seat frame is provided. The side airbag device for a vehicle according to any one of claims 2 to 4.

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