JP2007083920A - Side airbag device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a side airbag device capable of easily and adequately controlling the pressure in a plurality of chambers formed in an airbag. <P>SOLUTION: The side airbag device has an inflator 12, an airbag 13, and a fastening band 46. The airbag 13 comprises right and left base cloths 31a, 31b, a tether 41 and an annular joining part 39 for joining the base cloths 31a, 31b with each other, and an opening hole 37b opened in the base cloths 31a, 31b in an area surrounded by the annular joining part 39. The tether 41 demarcates the airbag 13 into upper and lower chambers 42, 43. The annular joining part 39 consists of a seam arranged across the tether 41. The inflator 12 has an upper gas ejection unit 21, a lower gas ejection unit 22 and an inflator fixing unit 23. The fastening band 46 is passed through the opening hole 37b, and fastened while winding the base cloths 31a, 31b around the inflator fixing part 23. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a side airbag device including an inflator and an airbag that is deployed between a body side portion of a vehicle and an occupant by gas generated from the inflator.

For example, Patent Literature 1 discloses a gas bag type side impact protection device that includes a compressed gas source and a gas bag and that can reduce damage caused by impact from the side. The gas bag of this side impact protection device is provided with a first chamber that can be inflated on the side of the chest of the occupant and a second chamber that can be inflated on the side of the pelvis of the occupant. Further, the first chamber and the second chamber are filled with gas so that the internal pressures in the filled state are different. Preferably, the pressure in the first chamber is about 0.5 bar and the pressure in the second chamber is about 1.5 bar.
JP 2000-177527 A

  In an airbag including a plurality of chambers, appropriately controlling the pressure in each chamber is extremely important for further improving the protection performance of the occupant by the airbag. Therefore, the present inventors have intensively studied a structure for appropriately controlling the pressure in each chamber. As a result, it has been found that the pressure in each chamber can be appropriately controlled by a structure different from that of the conventional gas bag side impact protection device. And based on these knowledge, it came to complete this invention.

  An object of the present invention is to provide a side airbag device in which it is easy to appropriately control the pressures in a plurality of chambers provided in the airbag.

  In order to achieve the above object, a first aspect of the present invention provides a side air including an inflator and an airbag that is deployed between a vehicle body side portion and an occupant by gas generated from the inflator. In the bag apparatus, the airbag includes a bag-shaped base fabric, chamber partitioning means and an annular joint for joining the base fabrics facing in the vehicle width direction, and an area surrounded by the annular joint. The chamber partition means extends from the base end portion of the airbag toward the tip and prevents the gas from flowing through the deployed airbag. The annular joint portion is disposed so as to cross the chamber partitioning means at the base end portion of the airbag and is in the deployed state. The gas is prevented from flowing out of the opening hole with respect to the bag, and the inflator is disposed closer to the base end side than the annular joint inside the airbag, and the gas is introduced into the first chamber. A first gas ejection portion that ejects; a second gas ejection portion that ejects the gas into the second chamber; and an inflator fixing portion positioned between the first gas ejection portion and the second gas ejection portion. And the side airbag device further includes a fastening band that is inserted into the opening hole and fastened while the base fabric is wound around the inflator fixing portion.

  According to this configuration, in the deployed airbag, the boundary between the first chamber and the second chamber extends from the proximal end to the distal end in the deployment direction of the airbag. Both the chamber partitioning means and the fastening band are provided at the boundary between the two chambers. The chamber partitioning means partitions the boundary between the two chambers from the base end portion to the tip end of the deployed airbag so as to prevent gas flow. The fastening band seals the boundary between the two chambers in the deployed airbag so as to prevent the gas from flowing from the proximal end of the airbag to the proximal end of the chamber partition means. For this reason, the airbag in the deployed state is sealed so as to prevent the gas from flowing over the entire boundary between the first chamber and the second chamber. It becomes possible to implement independently. Therefore, it becomes easy to appropriately control the pressure in each chamber.

  The sealing of the boundary between both chambers by the fastening band includes an annular joint extending across the chamber partitioning means, an opening opening in a base fabric in a region surrounded by the annular joint, and the opening hole. The fastening band is inserted into the fastening member and fastened while winding the base fabric around the inflator fixing portion. That is, an annular joint portion is provided between the chamber partitioning means and the inflator at the base end portion of the deployed airbag. The annular joining portion prevents the gas from flowing inside and outside the joined annular region by joining the base fabrics facing in the vehicle width direction in an annular shape. One end of the annular joint is joined to the chamber partitioning means so as to prevent gas flow between the two chambers, and the other end of the annular joint is connected between the chambers by the fastening force of the fastening band. Is in pressure contact with the periphery of the inflator fixing portion so as to prevent the gas from flowing therethrough. Further, the base fabric around the inflator fixing portion is pressed around the inflator fixing portion by the fastening force of the fastening band. For this reason, the boundary is sealed from one end of the annular joint joined to the chamber partitioning means to the base end of the airbag in order to prevent gas from flowing between the two chambers.

  The gist of the side airbag device according to claim 2 is that, in the invention according to claim 1, the inflator fixing portion is provided with a concave groove corresponding to the fastening band.

  According to this configuration, since the fastening band is locked in the concave groove of the inflator fixing portion, even when pressed by the gas generated from the inflator, the fastening band is directed toward the first gas ejection portion or the second gas ejection portion. It will not move easily. Furthermore, since the base fabric wound between the fastening band and the inflator fixing portion is pressed against the back surface of the concave groove, it is also pressed against the side surface of the concave groove. As a result, the sealing performance is improved, and as a result, the gas flow between the two chambers can be more effectively prevented.

  ADVANTAGE OF THE INVENTION According to this invention, the side airbag apparatus which can control each of the pressure in the several chamber provided in the airbag appropriately each can be provided.

  Hereinafter, an embodiment in which a side airbag device of the present invention is embodied will be described in detail with reference to the drawings. In the following description, when explaining the direction, the forward direction of the vehicle is described as the front, and in the case of an airbag, the upper, lower, front, rear, and left are based on the airbag at the time of deployment. , Right, respectively.

  FIG. 1A shows a seat 11 disposed in a vehicle compartment of a vehicle and an occupant P seated on the seat 11. The seat 11 includes a seat portion 11a and a backrest portion 11b. An inflator 12 and a folded airbag 13 are embedded in a case (not shown) in a side portion on the vehicle exterior side of the backrest portion 11b. The airbag 13 of the present embodiment is deployed from the side of the backrest portion 11b toward the front of the vehicle.

  Therefore, in the following description, the proximal end portion and the distal end portion of the airbag 13 in the deployed state are defined with reference to the deployment direction of the airbag 13. In the present embodiment, the base end portion of the airbag 13 in the deployed state shown in FIG. 1A indicates the vicinity of the inflator 12 located at the rear end portion (rear side of the vehicle) of the airbag 13. The distal end portion of the airbag 13 refers to the vicinity of the outer peripheral portion of the airbag 13 located at the front end portion (front side of the vehicle) of the airbag 13. Incidentally, in the case of an airbag whose deployment direction is different from that of the airbag 13 of the present embodiment, the base end portion and the distal end portion of the airbag are defined with reference to the deployment direction of the airbag.

  The inflator 12 is disposed at the proximal end portion of the airbag 13 in the deployed state. The inflator 12 is formed in a substantially cylindrical shape, and is arranged so that its longitudinal direction extends substantially in the vertical direction of the vehicle along the backrest portion 11b. As shown in FIG. 2 (a), the upper and lower portions of the inflator 12 are an upper gas ejection portion 21 and a second gas ejection portion as a first gas ejection portion for ejecting gas generated from the inflator 12. The lower gas jetting portions 22 are respectively provided.

  In the inflator 12, an inflator fixing portion 23 for fixing the airbag 13 to the inflator 12 and a pair of fixing bolts for fixing the inflator 12 to the case are provided between the upper gas ejection portion 21 and the lower gas ejection portion 22. 24 are provided. In the inflator fixing portion 23 of the present embodiment, the concave portion 23a is formed by rolling the center portion in the longitudinal direction of the inflator 12 over the entire circumferential direction. The fixing bolt 24 protrudes between the concave groove 23a and the upper gas ejection part 21 and between the concave groove 23a and the lower gas ejection part 22, and is disposed on the vehicle exterior side of the backrest part 11b. Screwed into each case.

  As shown in FIG. 2 (a), the airbag 13 has a first seam 32 that sews the peripheral edges of a pair of left and right first base fabrics 31 a and second base fabrics 31 b formed in the same shape. Thus, it is formed in a bag shape. In the deployed airbag 13, the first base fabric 31 a is disposed on the seat 11 side, and the second base fabric 31 b is disposed on the vehicle outer side.

  The first seam 32 extends along the entire periphery of both base fabrics 31 a and 31 b except for the opening 33 located at the base end of the airbag 13. The opening 33 is used when the left and right base fabrics 31 a and 31 b are joined together by the first seam 32 and then turned over, and the inflator 12 is mounted in the airbag 13. It is used as an insertion port when doing. The opening 33 is also used when a harness (not shown) connected to the inflator 12 is inserted from the inside of the airbag 13 to the outside. Furthermore, the opening 33 of the present embodiment may have a function as a vent hole.

  In order to allow the fixing bolt 24 of the inflator 12 mounted in the airbag 13 to be inserted in the vicinity of the opening 33 of the first base fabric 31a and to project the tip of the fixing bolt 24 to the outside of the airbag 13, A pair of upper and lower circular holes 36 are opened. In the first base fabric 31a, a first opening hole 37a having a long hole extending substantially parallel to a straight line connecting both the circular holes 36 is provided on the tip side of the airbag 13 with respect to the circular holes 36. In the second base cloth 31b facing the first base cloth 31a, a second opening hole 37b having the same shape is provided at a position corresponding to the first opening hole 37a.

  The first opening hole 37a and the second opening hole 37b are provided at positions corresponding to the vehicle width direction in the airbag 13 in the deployed state. Around the opening holes 37a and 37b, an annular joint 39 is provided by sewing the base fabrics 31a and 31b into an elliptical ring shape with the second seam 38a and the third seam 38b, respectively. In the present embodiment, the second seam 38a and the third seam 38b constituting the annular joint 39 are both arranged concentrically with the two opening holes 37a and 37b as the center. The annular joint 39 seals the inside and outside of the airbag 13 in a deployed state so as to prevent the outflow of gas through both the opening holes 37a and 37b. As described above, in order to enable the fixing bolt 24 of the inflator 12 to be fixed to the case through the circular hole 36, the outer end portion (the third seam 38b in the present embodiment) of the annular joint portion 39 has both circular holes. It is located on the tip side of the airbag 13 relative to 36.

  As shown in FIGS. 1 (a), 1 (b) and 2 (a), the airbag 13 in a deployed state includes an upper chamber 42 as a first chamber by incorporating a tether 41 as a chamber partitioning means. And a lower chamber 43 as a second chamber. In the present embodiment, the tether 41 extends in the forward direction of the vehicle from the base end portion of the airbag 13 toward the tip, and both chambers 42 and 43 are partitioned vertically with the tether 41 as a boundary. Has been.

  The tether 41 is formed in the shape of a long rectangle (strip shape) from the same material as the base fabrics 31a and 31b. In the airbag 13 in the deployed state, the longitudinal direction is directed forward and backward, and the lateral direction is directed left and right. Are arranged. On both side portions of the tether 41 in the longitudinal direction, joint portions 41a each having a rectangular shape are provided. Each joint portion 41a is sewn to the inner side surface of the corresponding base fabric 31a, 31b via the fourth seam 44. As a result, the tether 41 connects both the base fabrics 31a and 31b in the vehicle width direction and regulates the width of the airbag 13 with respect to the direction so as to be deployed in a desired shape. In addition, each joint portion 41a has a base seam at the fourth seam 44 so as to prevent gas from flowing between the chambers 42 and 43 over the entire joint region with the corresponding base fabric 31a and 31b. It is joined to 31a, 31b.

  At the distal end portion of the airbag 13 in the deployed state, one end portion in the longitudinal direction of the tether 41, that is, the distal end portion 41b of the tether 41 includes the first seam 32, including the end portions of both joint portions 41a facing left and right. Is sewn between both base fabrics 31a and 31b. That is, at the front end portion of the airbag 13 in the deployed state, the chambers 42 and 43 are sealed so that gas does not flow between the chambers 42 and 43 through the tether 41. As shown in FIGS. 2A and 3A, at the proximal end portion of the airbag 13 in the deployed state, the other end portion in the longitudinal direction of the tether 41, that is, the proximal end portion 41c of the tether 41 is left and right. Both the ends of the opposing joint portions 41a are sewn between the base fabrics 31a and 31b at the second seam 38a and the third seam 38b. That is, at the base end portion of the airbag 13 in the deployed state, the chambers 42 and 43 are sealed so that gas does not flow between the chambers 42 and 43 through the tether 41.

  As shown in FIGS. 2A and 3A, the inflator 12 is disposed at the boundary between the upper chamber 42 and the lower chamber 43 at the base end portion of the airbag 13 in the deployed state. . The inflator 12 is accommodated inside the airbag 13 so as to be sandwiched between the first and second base fabrics 31a and 31b, and a pair of upper and lower fixing bolts 24 are inserted into the corresponding circular holes 36, respectively. By doing so, it is positioned at a predetermined position of the base end portion of the airbag 13. The predetermined position is an intermediate position between the opening 33 and the annular joint 39 with respect to the advancing direction of the airbag 13 in the deployed state shown in FIG. 3A, and with respect to the height direction of the airbag 13. This is the position where the inflator fixing portion 23 and the opening holes 37a and 37b coincide.

  In the present embodiment, with respect to the height direction of the airbag 13 in the deployed state, the opening 33 is disposed at a position offset above the inflator fixing portion 23 (both circular holes 36). In this case, since the lower gas ejection part 22 of the inflator 12 is accommodated in the airbag 13 so as to be completely surrounded by both base fabrics 31a, 31b, the gas ejected from the lower gas ejection part 22 All are quickly filled into the lower chamber 43, and as a result, it is easy to quickly increase the pressure in the lower chamber 43. Further, in this case, since the opening 33 is provided at a position offset from the inflator fixing portion 23 with respect to the height direction of the airbag 13 in the deployed state, the inflator fixing portion 23 by the fastening band 46, the base fabric 31a, The sealing property between 31b is easily improved. Moreover, since the opening 33 is located on the upper chamber 42 side, it can function as a vent hole when the gas filled in the upper chamber 42 is discharged to the outside of the airbag 13.

As shown in FIG. 3B, a fastening band 46 is attached to the proximal end portion of the airbag 13 in the deployed state.
As shown in FIG. 2 (b), the fastening band 46 includes an annular metal band 46a and a fastening portion 46b provided at the base end of the metal band 46a. The inner diameter of the metal band 46a is changed by moving forward and backward while being locked by the fastening portion 46b. A worm wheel 46c is provided at the tip of the metal band 46a, and a bolt-shaped worm (not shown) that meshes with the worm wheel 46c is provided at the fastening portion 46b. That is, the fastening band 46 is configured to advance and retract the tip end portion of the metal band 46a with respect to the fastening portion 46b by a worm gear mechanism, thereby changing the inner diameter of the metal band 46a. Incidentally, a head portion 46d exposed to the outer surface of the fastening portion 46b is provided at the proximal end portion of the worm, and the tip portion of the metal band 46a is rotated by rotating the head portion 46d with a jig such as a screwdriver. Is advanced and retracted with respect to the base end.

  In the airbag 13 in the state shown in FIG. 3A, the fastening band 46 is inserted and hooked into the opening holes 37a and 37b and the base fabrics 31a and 31b are connected to the inflator fixing portion 23. While being wound around, the inflator fixing portion 23 is tightened together with the base fabrics 31a and 31b, so that the airbag 13 is mounted. For this reason, as shown in FIG. 3B, the fastening band 46 is configured so that all of the left and right base fabrics 31a and 31b from the opening holes 37a and 37b to the base end of the airbag 13 are surrounded by the inflator fixing portion 23. Pressure contact. And in the area | region contacted, the clearance gap between the outer peripheral surface of the inflator fixing | fixed part 23 and the inner surface of base fabric 31a, 31b is obstruct | occluded, and the distribution | circulation of the gas between the upper and lower chambers 42 and 43 is prevented. Incidentally, at the base end portion of the airbag 13 in the state shown in FIG. 3A before the fastening band 46 is attached, the gas flows between the upper and lower chambers 42 and 43 along the space around the inflator 12. Is allowed.

  As shown in FIGS. 1A and 1B, in this embodiment, the boundary between the upper chamber 42 and the lower chamber 43 is partitioned by a tether 41, an annular joint 39, and an inflator fixing portion 23. Incidentally, as shown in FIG. 3B, the boundary between the chambers 42 and 43 in the annular joint 39 includes two of a first boundary line 47a and a second boundary line 47b. The first boundary line 47a is a curve extending along the upper half of the third seam 38b, and includes an intersection point X between the tether 41 and the third seam 38b and an intersection point Y between the third seam 38b and the inflator fixing portion 23. It is a connecting curve. The second boundary line 47b is a curve extending along the lower half of the third seam 38b, and includes an intersection X of the tether 41 and the third seam 38b and an intersection Z of the third seam 38b and the inflator fixing portion 23. It is a connecting curve.

Next, the operation of the side airbag device of the present embodiment will be described.
The side airbag device of the present embodiment includes an inflator 12, an airbag 13, and a fastening band 46. Now, in this side airbag device, in the event of a side collision of the vehicle, as shown by a thick arrow in FIG. 1 (a), from the upper gas ejection part 21 and the lower gas ejection part 22 of the inflator 12, the inside of the upper chamber 42 and the lower part Gases are respectively ejected into the chamber 43. The airbag 13 is deployed between the body side portion of the vehicle and the occupant P by the gas ejected into the chambers 42 and 43.

  In the airbag 13 in the deployed state, the boundary between the upper chamber 42 and the lower chamber 43 extends from the proximal end to the distal end in the deployment direction of the airbag 13. Both the tether 41 and the fastening band 46 are provided at the boundary between the chambers 42 and 43. The tether 41 partitions the boundary between the chambers 42 and 43 from the base end portion to the tip end of the airbag 13 in the deployed state so as to prevent the gas from flowing. The fastening band 46 seals the boundary between the chambers 42 and 43 in the deployed airbag 13 from the proximal end of the airbag 13 to the proximal end of the tether 41 so as to prevent gas flow. . For this reason, since the airbag 13 in the deployed state is sealed to prevent the gas from flowing through the entire boundary between the upper chamber 42 and the lower chamber 43, the pressure in the chambers 42 and 43 is reduced. Control can be performed independently for each of the chambers 42 and 43.

  The boundary between the chambers 42 and 43 by the fastening band 46 is sealed as follows. That is, the sealing of the boundary includes an annular joint 39 extending across the tether 41, opening holes 37a and 37b opened in the base fabrics 31a and 31b in a region surrounded by the annular joint 39, and the opening holes. The fastening band 46 is inserted into the members 37 a and 37 b and fastened while winding the base fabrics 31 a and 31 b around the inflator fixing portion 23.

  In other words, the annular joint 39 is provided between the base end portion 41 c of the tether 41 and the inflator 12 at the base end portion of the airbag 13 in the deployed state. The annular joint portion 39 prevents the gas from flowing in and out of the joined annular region by joining the base fabrics 31a and 31b facing each other in the vehicle width direction in an annular shape. One end of the annular joint 39 is joined to the base end 41c of the tether 41 so as to prevent gas from flowing between the chambers 42 and 43, and the other end of the annular joint 39 is fastened. The band 46 is pressed against the periphery of the inflator fixing portion 23 so as to prevent gas from flowing between the chambers 42 and 43 by the fastening force of the band 46. Further, the base fabrics 31 a and 31 b around the inflator fixing portion 23 are pressed against the periphery of the inflator fixing portion 23 by the fastening force of the fastening band 46. For this reason, in order to prevent the flow of gas between the chambers 42 and 43 from one end of the annular joint 39 joined to the base end 41c of the tether 41 to the base end of the airbag 13, the boundary between them is sealed. Has been.

  In addition, the inflator fixing portion 23 of the present embodiment is provided with a concave groove 23 a corresponding to the fastening band 46. Thereby, since the fastening band 46 is locked to the concave groove 23a of the inflator fixing portion 23, even when pressed by the gas generated from the inflator 12, it does not easily move upward or downward. . Further, the base fabrics 31a and 31b wound between the fastening band 46 and the inflator fixing portion 23 are pressed against the back surface of the concave groove 23a and also pressed against the side surface of the concave groove 23a. Therefore, the sealing performance in the inflator fixing portion 23 is improved, and as a result, the gas flow between the chambers 42 and 43 can be more effectively prevented.

  And in the airbag 13 of this embodiment, since the movement of the gas between both chambers 42 and 43 is not caused as mentioned above, the pressure control in each chamber 42 and 43 is carried out independently for each chamber 42 and 43. It has been implemented. More specifically, in the airbag 13 of the present embodiment, the pressure in the lower chamber 43 is set to be higher than the pressure in the upper chamber 42 in the deployed state.

  For this reason, in this airbag 13, since the restraint force with respect to the waist | hip | lumbar part of the passenger | crew P is raised, since the restraint force with respect to a chest part and a shoulder part is set low, it is suitable for each body part (skeleton) of the passenger | crew P The restraining force of the high strength will be exerted on the appropriate part. Further, in the airbag 13, it is easy to continuously maintain a high pressure in the lower chamber 43, and thus it is possible to continuously exert a high restraining force on the waist of the occupant P. Therefore, in this side airbag device, it is easy to effectively protect the passenger P.

The effects exhibited by the embodiment will be described below.
(1) The side airbag device of the present embodiment includes the inflator 12, the airbag 13, and the fastening band 46. The airbag 13 is opened to the left and right base fabrics 31a and 31b, the tether 41 and the annular joint 39 that join the base fabrics 31a and 31b, and the base fabrics 31a and 31b in the region surrounded by the annular joint 39. Opening holes 37a and 37b. Further, the tether 41 partitions the airbag 13 into an upper chamber 42 and a lower chamber 43, and the annular joint portion 39 includes a third seam 38b disposed so as to cross the proximal end portion 41c of the tether 41. In addition, the inflator 12 includes an upper gas ejection part 21, a lower gas ejection part 22, and an inflator fixing part 23, and the fastening band 46 is inserted into the opening holes 37 a and 37 b and around the inflator fixing part 23. The base fabrics 31a and 31b are fastened while being wound.

  For this reason, in this side airbag device, both the tether 41 and the fastening band 46 are provided at the boundary between the chambers 42 and 43, and the gas flows over the entire boundary between the chambers 42 and 43. It is sealed to prevent this. That is, in the airbag 13 of this side airbag device, gas movement between the chambers 42 and 43 is not caused, so that the pressure control in each chamber 42 and 43 is performed independently for each chamber 42 and 43. Therefore, it becomes easy to appropriately control the pressure in each of the chambers 42 and 43.

  (2) In the side airbag device according to the present embodiment, the inflator fixing portion 23 is provided with a concave groove 23 a corresponding to the fastening band 46. For this reason, since the fastening band 46 is locked in the concave groove 23a of the inflator fixing portion 23, even when pressed by the gas generated from the inflator 12, it does not easily move upward or downward. . Furthermore, the base fabrics 31a and 31b wound between the fastening band 46 and the inflator fixing portion 23 are pressed against the back surface of the concave groove 23a and also pressed against the side surface of the concave groove 23a. Therefore, the sealing performance in the inflator fixing portion 23 is further improved. As a result, it is possible to more effectively prevent the gas from flowing between the chambers 42 and 43.

(Example of change)
In addition, this embodiment can also be changed and embodied as follows.
The opening 33 may be formed at any position of the base fabrics 31 a and 31 b as long as the opening 33 can be mounted in the airbag 13. Further, the opening 33 may be closed by binding the peripheral portions of the base fabrics 31a and 31b after the inflator 12 is mounted in the airbag 13 or the like.

  The tether 41 may be omitted, and the left and right base fabrics 31a and 31b facing each other in the vehicle width direction may be sewn with seams along the joint portion 41a. In this case, the seam serves as chamber partitioning means for partitioning the upper chamber 42 and the lower chamber 43. Even when configured in this manner, the chambers 42 and 43 can be reliably sealed as in the above-described embodiment, so that the pressure in each chamber 42 and 43 can be appropriately controlled. It becomes easy.

  The second seam 38a may be omitted from the annular joint 39. In this case, the base end portion 41c of the tether 41 is sealed at the annular joint portion 39 made of the third seam 38b so as to prevent the gas from flowing between the upper and lower chambers 42, 43. It becomes easy to appropriately control the pressures in 42 and 43, respectively. In the annular joint 39, the third seam 38b may be omitted instead of the second seam 38a.

  Instead of configuring the annular joint 39 by the second seam 38a and the third seam 38b, the annular joint 39 is configured by a tether that annularly joins the left and right base fabrics 31a, 31b facing each other in the vehicle width direction. Is also possible. Further, the annular joint portion 39 can be configured by a bag-like base cloth formed like an inner bag.

  In the annular joint portion 39, the base fabrics 31a and 31b may be joined in the vehicle width direction in all regions except the opening holes 37a and 37b. In this case, in the annular joint portion 39, the base fabrics 31a and 31b may be joined by welding or adhesion.

  -Although the airbag 13 of the said embodiment was comprised by two chambers, the upper chamber 42 as a 1st chamber, and the lower chamber 43 as a 2nd chamber, in addition to those chambers 42 and 43, For example, a third chamber 51 as shown in FIGS. 4A and 4B can be provided.

  As the third chamber 51, as shown in FIGS. 4A and 4B, an upper region obtained by dividing the upper chamber 42 of the above embodiment into upper and lower portions can be assigned. In this case, the lower chamber 43 corresponds to the waist of the occupant P, the upper chamber 42 corresponds to the chest of the occupant P, and the third chamber 51 corresponds to the shoulder of the occupant P. Further, in this case, the inflator fixing portion 23 of the above embodiment and the third gas ejection portion 52 that ejects gas into the third chamber 51 are provided above the upper gas ejection portion 21 of the inflator 12. The tether 41, the annular joint 39, the opening holes 37a and 37b, and the fastening band 46 of the above embodiment are provided at the boundary between the third chamber 51 and the upper chamber 42. With these configurations, both chambers are provided. Gas distribution between 51 and 42 is prevented.

  -In the airbag 13 shown to Fig.4 (a), (b), the distribution | circulation of the gas between the 3rd chamber 51 and the upper chamber 42 does not need to be prevented. However, in this case, the gas flow between the upper chamber 42 and the lower chamber 43 needs to be prevented. Further, in this case, the annular joint 39 provided at the boundary between the third chamber 51 and the upper chamber 42, the opening holes 37a and 37b, the fastening band 46, etc. may be omitted including the third gas ejection part 52. I do not care.

  -Although the airbag 13 of the said embodiment was a structure expand | deployed toward the advancing direction of a vehicle from the backrest part 11b, for example, the airbag 13 expand | deployed upwards from the vehicle outer side part of the seat part 11a. It is also possible to provide a side airbag device provided with In this case, in the side airbag device of this modification, the airbag 13 in the deployed state is located at the boundary between the front chamber as the first chamber, the rear chamber as the second chamber, and the two chambers divided in the front and rear directions. A tether 41 as chamber partitioning means extending in the vertical direction is provided, and an annular joint 39 joined to the lower end of the tether 41 is provided. Furthermore, the side airbag device of the present modification is provided with an inflator 12 that is fixed to the side portion of the seat portion 11a, and a fastening band 46 that is fastened while winding the base fabrics 31a and 31b around the inflator 12. ing. Since the airbag 13 of the present modification is deployed upward from the side portion of the seat portion 11a, the base end portion of the airbag 13 is located near the seat portion 11a and the distal end portion is located above the seat portion 11a. Will be.

  -Although the airbag 13 of the said embodiment was mounted | worn with the sheet | seat 11, you may mount | wear the airbag 13 with the body side part of a vehicle. Examples of the vehicle body side portion include an inner trim such as a door trim.

  In the above embodiment, the pair of fixing bolts 24 project from the peripheral surface of the inflator 12, but the two fixing bolts 24 are retainers (not shown) for fixing the central portion of the inflator 12 to the case. ) May be provided on the peripheral surface. The retainer is formed, for example, in a cylindrical shape that can be fixed by inserting a central portion of the inflator 12 including the inflator fixing portion 23. In this case, the metal band 46 a of the fastening band 46 is fastened while the base fabrics 31 a and 31 b are pressed against the center portion of the retainer that covers the outer periphery of the inflator fixing portion 23.

  The retainer may be a split retainer. The split retainer is composed of an upper retainer (not shown) fixed between the inflator fixing portion 23 and the upper gas ejection portion 21, and a lower retainer (not shown) fixed between the inflator fixing portion 23 and the lower gas ejection portion 22. It is comprised by two cylindrical members. Further, fixing bolts 24 project from the peripheral surfaces of the upper retainer and the lower retainer of the split retainer.

  -You may abbreviate | omit the ditch | groove 23a and form the outer diameter of the surrounding wall of the inflator fixing | fixed part 23 in the same diameter as the surrounding wall of the inflator 12 located up and down. In the present modification, when the retainer is provided, the shape of the retainer needs to correspond to the outer surface shape of the inflator 12 including the inflator fixing portion 23 of the present modification.

  The inflator 12 may be formed in a polygonal column shape such as a quadrangular column shape, a hexagonal column shape, an octagonal column shape, or an elliptical column shape. In this case, the metal band 46 a of the fastening band 46 and the retainer need to correspond to the shape of the inflator fixing portion 23.

The fastening band 46 may be made of a synthetic resin as long as it has sufficient strength.
A vent hole may be provided in the airbag 13 separately from the opening 33 in the above embodiment. It is preferable that the vent hole is provided in the upper part of the second base fabric 31b constituting the upper chamber 42.

  In the above embodiment, the airbag 13 is configured by joining the two base fabrics 31a and 31b arranged in the vehicle width direction. However, the airbag 13 is configured by one base fabric. It doesn't matter. When the airbag 13 is configured by a single base fabric, for example, a base fabric in which a part of the periphery of the first base fabric 31a and the corresponding peripheral portion of the second base fabric 31b are not separated is prepared, The airbag 13 can be configured by joining the peripheral edges of the base fabric.

  In the above embodiment, the base fabrics 31a and 31b and the base fabrics 31a and 31b and the tether 41 are joined by seam sewing, but they are joined by welding or adhesion. May be.

Further, the technical idea that can be grasped from the embodiment will be described below.
The side airbag device according to claim 1 or 2, wherein the chamber partitioning means is made of a tether or a seam.

The side airbag device according to claim 1 or 2, wherein the fastening band is fastened so as to press-contact the base fabric around the inflator fixing portion.
The fastening band fastens the periphery of the inflator fixing portion while pressing the base fabric disposed between the annular joint portion and the inflator fixing portion against the inflator fixing portion. Item 3. The side airbag device according to Item 2.

(A) is a side view showing an occupant seated on a seat and an airbag in a deployed state, and (b) is a cross-sectional view of the airbag along line 1b-1b in FIG. 1 (a). (A) is a disassembled perspective view which shows an airbag and an inflator, (b) is a perspective view which shows a fastening band. (A) is a partial expanded side view which shows the base end part of the airbag before fastening band mounting | wearing, (b) is a partial enlarged side view which shows the base end part of the airbag after fastening band mounting | wearing. (A) is a side view which shows the side airbag apparatus of a modification, (b) is sectional drawing of the airbag along the 4b-4b line | wire of Fig.4 (a).

Explanation of symbols

  DESCRIPTION OF SYMBOLS 12 ... Inflator, 13 ... Air bag, 21 ... Upper gas ejection part as 1st gas ejection part, 22 ... Lower gas ejection part as 2nd gas ejection part, 23 ... Inflator fixing | fixed part, 23a ... Concave groove, 31a, 31b: base cloth, 37a, 37b: opening hole, 39: annular joint, 41 ... tether as chamber partition means, 42 ... upper chamber as first chamber, 43 ... lower chamber as second chamber, 46 ... fastening Band, P ... Crew.

Claims (2)

A side airbag device comprising an inflator and an airbag that is deployed between a vehicle body side portion and an occupant by gas generated from the inflator,
The airbag has a bag-like base fabric, chamber partitioning means and an annular joint for joining between the base fabrics facing in the vehicle width direction, and an opening in the base fabric in a region surrounded by the annular joint. With an opening hole,
The chamber partitioning means extends from the base end portion of the airbag toward the tip, and partitions the airbag in a deployed state into a first chamber and a second chamber while preventing the gas from flowing.
The annular joint is disposed across the chamber partition means at the proximal end of the airbag, and prevents the gas from flowing out of the opening with respect to the deployed airbag;
The inflator is disposed closer to the base end side than the annular joint inside the airbag, and a first gas ejection portion that ejects the gas into the first chamber, and the second chamber with the first gas ejection portion. A second gas ejection part for ejecting gas, and an inflator fixing part located between the first gas ejection part and the second gas ejection part,
The side airbag device further includes a fastening band that is inserted into the opening hole and fastened while the base fabric is wound around the inflator fixing portion.   The side airbag device according to claim 1, wherein the inflator fixing portion is provided with a concave groove corresponding to the fastening band.

Images