JP2017061207A - Airbag and airbag apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it difficult for an airbag to fall after inflation and deployment.SOLUTION: An airbag in which an outer peripheral edge part of a first panel is joined to an outer peripheral edge part of a second panel and which is stored in an inner side, in a vehicle width direction, of a backrest of a vehicle seat, comprises: a right joint part along a right outer peripheral edge part of the airbag; a lower joint part along a lower outer peripheral edge part of the airbag; a left joint part along a left outer peripheral edge part of the airbag; a first chamber inflated between the right outer peripheral edge part and the right joint part; a second chamber inflated between the lower outer peripheral edge part and the lower joint part; a third chamber inflated between the left outer peripheral edge part and the left joint part; and a fourth chamber inflated between the right joint part and the left joint part and between the lower joint part and the upper outer peripheral edge part of the airbag.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an airbag housed in a side portion of the backrest in the vehicle width direction and an airbag device including the airbag.

  There is known an airbag device that receives an occupant who moves relative to the impact input side by inertia force when an impact in the vehicle width direction is input to the body side portion of the vehicle with an airbag that protrudes from the back of the seat (for example, , See Patent Document 1). This airbag device receives an occupant sitting in a seat on the side near the impact input side with an airbag housed in a lateral portion of the backrest in the vehicle width direction, and is accommodated in a lateral portion of the backrest in the vehicle width direction. The passenger who sits in the seat on the side far from the impact input side is received.

JP 2010-70003 A

  In the case of an airbag that is housed in a lateral portion of the backrest in the vehicle width direction, the deployed airbag is pushed to the impact input side by the upper body of the occupant moving to the impact input side. However, even if the deployed airbag is pushed to the collision input side, it is supported by the body side portion of the vehicle, so that it does not easily fall to the collision input side.

  On the other hand, in the case of an airbag that is housed in a side portion of the backrest in the vehicle width direction, a portion that generally supports the deployed airbag, such as a body side portion of the vehicle, has an adjacent seat on the impact input side. Does not exist between. Therefore, the deployed airbag is likely to fall to the impact input side by the upper body of the occupant moving to the impact input side.

  In view of the above, an object of the present invention is to make it difficult for an airbag housed in the vehicle width direction inside of a backrest to fall after being inflated and deployed.

One idea is that
A first panel and a second panel;
The outer peripheral edge of the first panel and the outer peripheral edge of the second panel are joined in a state where the first panel and the second panel are overlapped, and the backrest of the seat of the vehicle is An air bag stored inside in the vehicle width direction,
A right joint that joins the first panel and the second panel along the right outer peripheral edge of the airbag;
A lower joint that joins the first panel and the second panel along a lower outer peripheral edge of the airbag;
A left joint that joins the first panel and the second panel along the left outer peripheral edge of the airbag;
A first chamber that expands between the right outer periphery and the right joint;
A second chamber that expands between the lower outer peripheral edge and the lower joint;
A third chamber that expands between the left outer peripheral edge and the left joint;
An airbag is provided that includes a fourth chamber that is inflated between the right joint and the left joint and between the lower joint and an upper outer peripheral edge of the airbag.

  According to the present plan, even if the inflated airbag is pushed to the impact input side by the occupant, the first chamber, the second chamber, the third chamber, and the fourth chamber are inflated, respectively. It will be difficult to fall to the impact input side.

In other plans,
A first panel and a second panel;
The outer peripheral edge of the first panel and the outer peripheral edge of the second panel are joined in a state where the first panel and the second panel are overlapped, and the backrest of the seat of the vehicle is An airbag that is housed in a side portion on the inner side in the vehicle width direction,
A linear right joint that joins the first panel and the second panel along the right outer peripheral edge of the airbag;
A linear lower joint that joins the first panel and the second panel along a lower outer peripheral edge of the airbag;
A linear left joint that joins the first panel and the second panel along the left outer peripheral edge of the airbag;
A first chamber that expands between the right outer periphery and the right joint;
A second chamber that expands between the lower outer peripheral edge and the lower joint;
A third chamber that expands between the left outer peripheral edge and the left joint;
A fourth chamber that expands between the right joint and the left joint and between the lower joint and the upper outer peripheral edge of the airbag;
The right joint, the lower joint, and the left joint are continuous,
When the horizontal width of the first chamber is D1, the vertical width of the second chamber is D2, and the horizontal width of the third chamber is D3,
(D1 / D2) is 0.8 or more and 1.2 or less, and (D3 / D2) is 0.8 or more and 1.2 or less, and the airbag is provided.

  According to the present plan, (D1 / D2) is not less than 0.8 and not more than 1.2, and (D3 / D2) is not less than 0.8 and not more than 1.2. The maximum thickness of the chamber and the third chamber in the expanded and deployed state can be made substantially equal. Therefore, in the inflated and deployed state of the airbag, at the boundary between adjacent chambers (in this case, the boundary between the first chamber and the second chamber and the boundary between the third chamber and the second chamber). It is difficult for streaks (bent lines) to enter the airbag surface. Therefore, since such a line becomes difficult to enter the boundary portion, the airbag is unlikely to fall after being inflated and deployed.

  According to one aspect, the airbag housed inside the vehicle width direction of the backrest can be made difficult to fall after being inflated and deployed.

It is a schematic front view which shows an example of the state which the airbag accommodated in the side part inside the vehicle width direction of a backrest inflate-deployed. It is a schematic side view which shows an example of the state which the airbag accommodated in the side part inside the vehicle width direction of a backrest inflate-deployed. It is a schematic block diagram which shows an example of the airbag apparatus in the non-inflation state of an airbag. It is a schematic sectional drawing which shows an example of the airbag apparatus in the cross section BB of FIG. It is a side view which shows an example of the airbag apparatus in the unfolded state before an airbag is folded. It is a schematic block diagram which shows an example of the airbag apparatus in the cross section CC of FIG. It is a schematic block diagram which shows an example of the airbag apparatus in the cross section DD of FIG. It is a side view which shows an example of the airbag apparatus in the unfolded state before an airbag is folded. It is a side view which shows an example of the airbag apparatus in the unfolded state before an airbag is folded. It is a side view which shows an example of the airbag apparatus in the unfolded state before an airbag is folded. It is a side view which shows an example of the airbag apparatus in the unfolded state before an airbag is folded. It is the schematic which shows an example of the cross-sectional shape of the airbag in the straight line A of FIG. 2, or the cross section CC of FIG. It is the schematic which shows another example of the cross-sectional shape of the airbag in the straight line A of FIG. 2, or the cross section CC of FIG. It is the schematic which shows an example of the cross-sectional shape of the airbag in the cross section DD of FIG. It is the schematic which shows another example of the cross-sectional shape of the airbag in the cross section DD of FIG.

  Embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic front view showing an example of a state in which the airbag 40 is inflated and deployed, and is a view of the vehicle 20 seen through from the front of the vehicle 20. A plurality of seats are installed in the vehicle 20 in parallel in the width direction of the vehicle 20 (vehicle width direction W). For example, one of the adjacent seats 11 and 12 is a driver seat and the other is a passenger seat. FIG. 1 shows a state where the occupant 10 is sitting on the seat 11.

  A center console 19 is disposed between the seat 11 and the seat 12. The center console 19 is provided with an operation unit such as an operation switch and a storage unit such as a cup holder.

  Each of the seats 11 and 12 includes a seat portion 13 on which the occupant's buttocks rest, a backrest 14 that protrudes upward from the vehicle rear side of the seat portion 13, and a headrest 15 that is provided on the top of the backrest 14. . The backrest 14 receives the occupant's back.

  The backrest 14 includes a side portion 21 located outside the vehicle width direction W and a side portion 22 located inside the vehicle width direction W. The airbag device 1 according to the present embodiment is an occupant restraint device that is stored in the side portion 22 on the inner side in the vehicle width direction of the backrest 14 in a non-inflated state before the airbag 40 is inflated and deployed.

  For example, when an impact F <b> 1 input from one side in the vehicle width direction W to one body side portion 17 of the vehicle 20 is detected, the airbag device 1 is located on the side of the seat 11 far from the body side portion 17. The airbag 40 disposed in the portion 22 is inflated and deployed. As a result, even if the upper body of the occupant 10 sitting on the seat 11 moves to the body side portion 17 side due to inertial force, the upper body of the occupant 10 is moved by the airbag 40 inflated and deployed toward the side surface and upward of the center console 19. I can take it.

  Although FIG. 1 shows a case where the airbag device 1 is stored in the side portion 22 of the backrest 14 of the seat 11, the airbag device 1 may be stored in the side portion 22 of the backrest 14 of the seat 12. . The airbag device 1 disposed in the seat 12 is far from the body side portion 18 when, for example, an impact F2 input from the other side in the vehicle width direction W to the other body side portion 18 of the vehicle 20 is detected. The airbag 40 arranged on the side portion 22 of the side seat 12 is inflated and deployed. As a result, even if the upper body of the occupant sitting on the seat 12 moves to the body side portion 18 side due to inertial force, the upper body of the occupant of the seat 12 can be removed by the airbag inflated and deployed toward the side surface and upward of the center console 19. I can take it.

  FIG. 2 is a schematic side view showing an example of a state where the airbag 40 is inflated and deployed, and is a view seen from one side in the vehicle width direction. The airbag device 1 includes an airbag 40 and an inflator 30. FIG. 2 shows a side view corresponding to the vehicle width direction when the airbag 40 mounted on the vehicle is inflated and deployed. A shows the straight line which passes along the shoulder opening of the passenger | crew 10 who seats on the seat 11 by the said side view.

  The airbag 40 is an example of an airbag stored in the side portion 22 on the inner side in the vehicle width direction of the backrest 14. The airbag 40 is formed so as to inflate in a substantially rectangular shape that stands in a substantially vertical direction. In the inflated and deployed state, the airbag 40 has an upper inflatable portion 46 that receives the head of the occupant 10, an intermediate upper inflatable portion 47 that receives the chest of the occupant, and an intermediate lower inflatable portion 48 that receives the abdomen of the occupant. . For example, the upper inflatable portion 46 and the intermediate upper inflatable portion 47 are inflated and deployed toward the upper space of the center console 19, and the intermediate lower inflatable portion 48 is a space between the side surface of the center console 19 and the abdomen of the occupant 10. Inflates and expands toward An inflating portion that is a combination of the upper inflating portion 46, the middle upper inflating portion 47, and the middle lower inflating portion 48 corresponds to a fourth chamber 44 described later.

  The inflator 30 is an example of an inflator that inflates and deploys the airbag 40. The inflator 30 is, for example, a gas supply device (gas generator) that supplies gas to the airbag 40, and the airbag 40 is inflated and deployed by supplying gas to the airbag 40. The backrest 14 accommodates the inflator 30 formed in a substantially cylindrical shape in the side portion 22 so that the longitudinal direction of the inflator 30 is the longitudinal direction of the backrest 14.

  The inflator 30 has an upper end 31 located on the upper side of the backrest 14 and a lower end 32 located on the lower side of the backrest 14. The inflator 30 ejects a gas for inflating and deploying the airbag 40 from the ejection hole formed in the convex upper end 31. Thereby, the inflating airbag 40 jumps out of the side portion 22 and is deployed between the side surface of the center console 19 and the abdomen of the occupant and above the center console 19.

  In the non-inflated state before the airbag 40 is inflated and deployed, the airbag device 1 is stored in the side portion 22 in a state in which the airbag 40 is folded.

  FIG. 3 is a schematic configuration diagram illustrating an example of the airbag apparatus 1 in a state where the airbag 40 is not inflated. FIG. 4 is a schematic cross-sectional view showing an example of the airbag apparatus 1 in a cross-section BB in FIG. As shown in FIGS. 3 and 4, the inflator 30 includes a cylindrical main body 33 and two attachment legs 34 protruding from the side surface of the main body 33. The mounting leg 34 is a bolt in which a thread is formed. In order to prevent the folded airbag 40 from collapsing or breaking, the airbag device 1 may be wrapped with a cover 36. The cover 36 is, for example, a nonwoven fabric or a resin case that can be cleaved as the airbag 40 is inflated. The folded shape of the airbag 40 is simplified in the drawing.

  The mounting leg 34 of the inflator 30 is inserted into the frame hole formed in the seat frame 16 in the backrest 14 in a state where the mounting leg 34 is inserted into the mounting hole 37 formed on the surface of the airbag 40. The airbag device 1 is fixed to the seat frame 16 by fastening the nut 35 and the mounting leg 34.

  FIG. 5 is a side view showing an example of the airbag device 1A in a non-folded state before the airbag 40 is folded, as viewed from the side. The airbag device 1 </ b> A is an example of the airbag device 1. Arrows C1, C2, C3, and C4 indicate directions when the airbag 40 accommodated in the backrest 14 is inflated and deployed, respectively. The rear side of the vehicle, the lower side of the vehicle, the front side of the vehicle, Points upward.

  The airbag 40 is an occupant restraining member formed in a bag shape so as to be inflated and deployed toward the side surface and upward of the center console 19 by the gas supplied from the upper end 31 of the inflator 30.

  For example, when the airbag 40 mounted on the vehicle is inflated and deployed, the airbag 40 is viewed from the side corresponding to the vehicle width direction, and the upper outer peripheral edge 52, the lower outer peripheral edge 53, and the right outer It has a substantially rectangular shape in which a peripheral edge 55 and a left outer peripheral edge 54 are formed. The longitudinal direction of the airbag 40 corresponds to a linear direction passing through the upper outer peripheral edge portion 52 and the lower outer peripheral edge portion 53. In a state where the airbag 40 mounted on the vehicle is inflated and deployed, the right outer peripheral edge 55 corresponds to the rear edge of the rear side of the vehicle, and the left outer peripheral edge 54 corresponds to the front edge of the front side of the vehicle. Equivalent to.

  The airbag 40 includes a pair of first panel 56 and second panel 57 that have substantially the same size. The airbag 40 is an airbag in which the outer peripheral edge of the first panel 56 and the outer peripheral edge of the second panel 57 are joined in a state where the first panel 56 and the second panel 57 are overlapped. It is an example. The outer peripheral edge of the first panel 56 and the outer peripheral edge of the second panel 57 are joined together by stitching or the like at a linear joint 60.

  The airbag 40 has an upper outer peripheral edge 52, a lower outer peripheral edge 53, a right outer peripheral edge 55, and a left outer peripheral edge 54 in a state where the first panel 56 and the second panel 57 are overlapped. And a linear joint portion 60 for joining them together by sewing or the like. A part of the outer peripheral edge portion of the overlapped panel has a non-joined portion that is not joined by the joint portion 60, and the inflator 30 can be inserted into the airbag 40 from the non-joined portion. The said non-joining part is located in the lower right outer periphery part between the right outer periphery part 55 and the lower outer periphery part 53, for example.

  Alternatively, the airbag 40 may be a member that is formed in a bag shape by folding one panel that is substantially symmetrical to the folding line 51 (symmetrical line). The substantially left-right symmetric panel has a right panel surface on the right side with respect to the folding line 51 and a left panel surface on the left side with respect to the folding line 51 in a state before being folded at the folding line 51. In this case, the right panel surface corresponds to the first panel 56, the left panel surface corresponds to the second panel 57, and the right outer peripheral edge 55 where the folding line 51 is located is joined by the joining portion 60. Not.

  The airbag 40 includes a right joint 61, a lower joint 62, and a left joint 63. The right joint 61 is an example of a linear joint that joins the first panel 56 and the second panel 57 along the right outer peripheral edge 55 of the airbag 40 by stitching or the like. The lower joint portion 62 is an example of a linear joint portion that joins the first panel 56 and the second panel 57 along the lower outer peripheral edge portion 53 of the airbag 40 by sewing or the like. The left joint portion 63 is an example of a linear joint portion that joins the first panel 56 and the second panel 57 along the left outer peripheral edge portion 54 of the airbag 40 by sewing or the like.

  The airbag 40 includes a first chamber 41, a second chamber 42, a third chamber 43, and a fourth chamber 44. The first chamber 41 is a first expansion portion that expands between the right outer peripheral edge portion 55 and the right joint portion 61. The second chamber 42 is a second expansion portion that expands between the lower outer peripheral edge portion 53 and the lower joint portion 62. The third chamber 43 is a third expansion portion that expands between the left outer peripheral edge portion 54 and the left joint portion 63. The fourth chamber 44 is a fourth inflating part that inflates between the right joining part 61 and the left joining part 63 and between the lower joining part 62 and the upper outer peripheral edge part 52 of the airbag 40. The right joint portion 61, the lower joint portion 62, and the left joint portion 63 are portions that are continuously connected in a line without passing through a non-joint portion.

  The boundary between the first chamber 41 and the second chamber 42 is located on an extension line of the right joint 61 in an unfolded state before the airbag 40 is inflated, and the first chamber 41 and the second chamber 42 are located. Communicates with the boundary. The boundary between the third chamber 43 and the second chamber 42 is located on the extension line of the left joint 63 in the unfolded state before the airbag 40 is inflated, and the third chamber 43 and the second chamber 42 are located. Communicates with the boundary.

  In FIG. 5, the width D <b> 1 represents the shortest distance in the left-right direction before the expansion of the first chamber 41, for example, the shortest distance in the left-right direction between the right joint 61 and the joint 60 of the right outer peripheral edge 55. . When the right outer peripheral edge portion 55 is not joined at the joining portion 60 but is folded at the folding line 51, the width D1 represents the shortest distance in the left-right direction between the right joining portion 61 and the folding line 51. The width D <b> 2 represents the shortest vertical distance before the expansion of the second chamber 42, for example, the shortest vertical distance between the lower joint 62 and the joint 60 of the lower outer peripheral edge 53. When the lower outer peripheral edge 53 is not joined by the joint 60 but is folded back by a folding line, the width D2 represents the shortest distance in the vertical direction between the lower joint 62 and the folding line of the lower outer circumferential edge 53. The width D3 represents the shortest distance in the left-right direction before expansion of the third chamber 43. For example, the width D3 represents the shortest distance in the left-right direction between the left joint 63 and the joint 60 of the left outer peripheral edge 54. When the left outer peripheral edge portion 54 is not joined at the joint portion 60 but is folded back by a folding line, the width D3 represents the shortest distance in the left-right direction between the left joint portion 63 and the folding line of the left outer circumferential edge portion 54. At this time, (D1 / D2) is 0.8 or more and 1.2 or less, and (D3 / D2) is 0.8 or more and 1.2 or less (hereinafter also referred to as “condition 1”). .

  The left-right direction corresponds to the front-rear direction of the vehicle when the airbag 40 mounted on the vehicle is inflated and deployed. The vertical direction corresponds to the vertical direction of the vehicle when the airbag 40 mounted on the vehicle is inflated and deployed.

  FIG. 6 is a cross-sectional view taken along a section CC in FIG. FIG. 7 is a sectional view taken along a section DD in FIG. When the above condition 1 is satisfied, the maximum thickness L1 of the first chamber 41 in the inflated and deployed state, the maximum thickness L2 in the inflated and deployed state of the second chamber 42, and the inflated and deployed of the third chamber 43 The maximum thickness L3 in the state can be made substantially equal.

  Since the maximum thickness L1 and the maximum thickness L2 are substantially equal, the airbag 40 is in the inflated and deployed state on the surface of the airbag 40 at the boundary between the first chamber 41 and the second chamber 42. Makes it difficult for lines (bent lines) to enter. Therefore, the airbag 40 is difficult to bend at the boundary portion. Similarly, since the maximum thickness L2 and the maximum thickness L3 are substantially equal, the airbag 40 at the boundary between the second chamber 42 and the third chamber 43 in the inflated and deployed state of the airbag 40. It becomes difficult for the muscles to enter the surface. Therefore, the airbag 40 is difficult to bend at the boundary portion. Therefore, even if the airbag 40 after inflating and deploying is pushed to the impact input side by the upper body of the occupant, it is difficult for the airbag 40 to fall to the impact input side.

  In FIG. 5, the width D <b> 4 represents the shortest distance in the left-right direction before expansion of the fourth chamber 44, for example, the shortest distance in the left-right direction between the right joint 61 and the left joint 63. At this time, (D3 / D4) is not less than 0.4 and not more than 1.6 (hereinafter also referred to as “condition 2”). When both condition 1 and condition 2 are satisfied, the maximum thickness L1 of the first chamber 41 in the expanded and deployed state, the maximum thickness L4 of the fourth chamber 44 in the expanded and deployed state, and the third chamber 43 The maximum thickness L3 in the expanded and unfolded state can be made substantially equal.

  Since the maximum thicknesses L1, L4, and L3 are substantially equal to each other, the first chamber 41, the fourth chamber 44, and the third chamber 43 are input from the upper body of the occupant to the airbag 40 in the vehicle width direction. Force can be received almost evenly. Therefore, even if the upper body of the occupant hits the airbag 40 after inflating and deploying (particularly, the region of the fourth chamber 44 of the airbag 40), the airbag 40 after inflating and deploying can be used when only condition 1 is satisfied. Compared to the impact input side, it is more difficult to fall.

  In consideration of the point that the fourth chamber 44 is a main part for receiving the upper body of the occupant and the point that the fourth chamber 44 is sandwiched between the occupant and the center console 19, the maximum thickness L4 is 80 mm or more or the width. D4 is preferably 125 mm or more. It is preferable that the maximum thickness L4 is 80 mm or more or that the width D4 is 125 mm or more in terms of making it easy to receive the upper body of the occupant and preventing the airbag 40 from falling down after being inflated and deployed.

寸法が異なる３つのエアバッグ４０（４０−１，４０−２，４０−３）を実際に用意し、各エアバッグ４０にエアを注入したところ、いずれのエアバッグもエアが十分に注入されることで、エアバッグ表面には筋はほとんど入らないという結果が得られた。

When three airbags 40 (40-1, 40-2, 40-3) having different dimensions are actually prepared and air is injected into each airbag 40, the air is sufficiently injected into any airbag. As a result, almost no streak was found on the airbag surface.

Airbag 40-1:
(D1 / D2) = 1.1875≈1.2
(D3 / D2) = 0.8125≈0.8
(D3 / D4) = 0.8125≈0.8
Airbag 40-2:
(D1 / D2) = 1.125 <1.2
(D3 / D2) = 0.875> 0.8
(D3 / D4) = 0.875> 0.8
Airbag 40-3:
(D1 / D2) = 1.0625 <1.2
(D3 / D2) = 0.9375> 0.8
(D3 / D4) = 0.9375> 0.8
For both airbags, both Condition 1 and Condition 2 are satisfied.

  In FIG. 5, the linear right joint that joins the first panel 56 and the second panel 57 along the right outer peripheral edge 55 is positioned above the right joint 61 and the right joint 61. And an upper right joint 64. The first chamber 41 communicates with the fourth chamber 44 at a non-joint portion 65 between the right joint portion 61 and the upper right joint portion 64. Since the first chamber 41 communicates with the fourth chamber 44 at the non-joint portion 65, the gas in the first chamber 41 is smoothly supplied to the fourth chamber 44. It can be inflated and deployed smoothly.

  The first chamber 41 accommodates the inflator 30 so that the longitudinal direction of the inflator 30 is the vertical direction of the airbag 40. The first chamber 41 is an inflating chamber that inflates at a lower portion on the vehicle rear side in the air bag 40 in a state in which the air bag 40 jumping out from the backrest 14 is inflated and deployed.

  The airbag 40 includes a fifth chamber 45. The fifth chamber 45 is located above the first chamber 41 so that a gas ejected from the upper end 31 of the inflator 30 flows above the first chamber 41 and extends in a cylindrical shape above the first chamber 41. It is an expansion chamber that expands and expands at. The fifth chamber 45 is an expansion chamber that is inflated at an upper portion of the airbag 40 on the vehicle rear side in a state where the airbag 40 that has jumped out from the backrest 14 is inflated and deployed. The fifth chamber 45 extends in the longitudinal direction of the airbag 40 above the first chamber 41.

  Thus, the airbag 40 includes the first chamber 41 that houses the inflator 30 such that the longitudinal direction of the inflator 30 is the vertical direction of the airbag 40, and the first gas that is ejected from the upper end 31 of the inflator 30. A fifth chamber 45 that expands and expands above the first chamber 41 so as to extend in a cylindrical shape above the chamber 41 is provided. By ejecting the gas from the upper end 31 of the inflator 30, for example, compared with the case where the gas is ejected from the lower end 32 of the inflator 30, the internal pressure of the fifth chamber 45 can be easily increased. The chamber 45 can be made stable and independent. As a result, even if the inflated airbag 40 is pushed toward the impact input side by the upper body of the occupant, the airbag 40 can be prevented from falling to the impact input side.

  Further, since the fifth chamber 45 is adjacent to the upper inflating portion 46 with which the occupant's head comes into contact, the deployment shape and the deployment behavior of the upper inflating portion 46 can be improved when the fifth chamber 45 is stably self-supporting. Stabilize.

  On the other hand, the first chamber 41 is adjacent to an intermediate upper inflatable portion 47 that contacts the occupant's chest and an intermediate lower inflatable portion 48 that contacts the occupant's abdomen. The first chamber 41 is fixed to the seat frame 16 in the backrest 14 (see FIG. 4) together with the inflator 30 through an attachment hole 37 formed in the region of the first chamber 41 on the surface of the airbag 40. ing. Therefore, even if the middle upper inflating portion 47 is deployed in the space above the center console 19 without any special support, it is adjacent to the upper portion of the fixed first chamber 41 obliquely. And the deployment behavior is stable. The intermediate lower inflating portion 48 and the lower inflating portion 49 are supported by the side surface of the center console 19 in order to deploy between the side surface of the center console 19 and the abdomen of the occupant. Since it is adjacent to the side, the deployed shape and the deployed behavior of the intermediate lower expanded portion 48 and the lower expanded portion 49 are further stabilized. The lower inflating portion 49 is an inflating portion below the intermediate lower inflating portion 48, and corresponds to the second chamber 42.

  As shown in FIG. 5, the fifth chamber 45 is a bag path that stops at the top 71 of the fifth chamber 45. Therefore, the gas flowing into the fifth chamber 45 can be retained in the fifth chamber 45, so that the internal pressure of the fifth chamber 45 can be easily increased, and the expanded and deployed fifth chamber 45 can be stably and independently supported. Can be made. Further, since the fifth chamber 45 is dead-end at the top 71 of the fifth chamber 45, the developed shape that expands in a cylindrical shape is stabilized. Therefore, even if the inflated airbag 40 is pushed to the impact input side by the upper body of the occupant, the airbag 40 is more unlikely to fall to the impact input side of the airbag 40. In the case of illustration, the top part 71 is located in the upper right outer peripheral part between the upper outer peripheral part 52 and the right outer peripheral part 55 of the airbag 40, and the 5th chamber 45 becomes a dead end in the upper right outer peripheral part. .

  When the airbag 40 is folded in the longitudinal direction of the airbag 40 by accordion fold, the deployment time of the airbag 40 can be shortened as compared with the case of being folded in the longitudinal direction of the airbag 40 by roll winding. FIG. 5 illustrates a part of the fold 89 of the bellows fold. The airbag 40 is folded by bellows folding in the longitudinal direction of the airbag 40 so that the fold 89 is orthogonal to the longitudinal direction of the airbag 40.

  FIG. 8 is a side view showing an example of the airbag device 1B in an unfolded state before the airbag 40B is folded. The airbag 40B is an example of the airbag 40, and the airbag device 1B is an example of the airbag device 1. Among the configurations of the airbag device 1B, the same descriptions as those of the airbag device 1A described above are cited for the configurations of the airbag device 1A and the airbag 40A.

  The airbag 40B includes a first right end joint portion 101, a second right end joint portion 102, and a left end joint portion 103. The first right end joint 101 is an example of an annular joint that is connected to the end 91 of the right joint 61 and joins the first panel 56 and the second panel 57 by stitching or the like. The second right end joint portion 102 is an example of an annular joint portion that is connected to the end portion 93 of the upper right joint portion 64 and joins the first panel 56 and the second panel 57 by stitching or the like. The left end joint 103 is an example of an annular joint that is connected to the end 92 of the left joint 63 and joins the first panel 56 and the second panel 57 by stitching or the like.

  By providing the annular joint at the end of the linear joint, stress concentration at the end can be suppressed. However, the width in the left-right direction of the chamber is reduced around the annular joint. Therefore, in the vicinity of the annular joint portion, the change in the thickness (expansion difference) in the inflated and deployed state of the chamber becomes large, and there is a possibility that left and right stripes are likely to enter the surface of the airbag.

  Therefore, as shown in FIG. 8, the first right end joint portion 101, the second right end joint portion 102, and the left end joint portion 103 are arranged so as not to be in a straight line in the left-right direction. As a result, since the left and right streaks that may occur around the first right end joint portion 101, the second right end joint portion 102, and the left end joint portion 103 are not located on a straight line, the airbag 40B is unlikely to fall down.

  In particular, when there are a plurality of annular joints provided at the ends of the linear joints in the region below the straight line A passing through the region where the shoulder of the occupant collides, these annular joints are used as airbags. It is preferable that they are arranged so as not to be positioned on a straight line in the left-right direction in that it is difficult to fall.

  As mentioned above, although the airbag and the airbag apparatus were demonstrated by embodiment, this invention is not limited to the said embodiment. Various modifications and improvements such as combinations and substitutions with some or all of the other embodiments are possible within the scope of the present invention.

  For example, the backrest in which the airbag is stored is not limited to the backrest of the front seat, and may be the backrest of the rear seat.

  Further, the present invention is not limited to the case where the entire joining portion that partitions the inside of the airbag in the longitudinal direction of the airbag is linear. For example, the joining portion has a portion that extends linearly and a portion that extends linearly. May be.

  The joining method at the joint is not limited to stitching, but may be adhesion or welding. Further, the joint portion may be joined by a tether that joins a pair of panel surfaces facing each other within the airbag. Further, the joint portion may be a single stitched suture portion or a double stitched suture portion according to the internal pressure required for the airbag.

  Further, the number of the annular joints connected to the ends of the linear joints may be two as in the airbag 40C of the airbag device 1C of FIG. 9, or the airbag device 1D of FIG. One may be sufficient like the airbag 40D. For the detailed description of FIGS. 9 and 10, the above description is incorporated.

  Further, as in the airbag 40E of the airbag apparatus 1E of FIG. 11, the right joint 61, the lower joint 62, the left joint 63, the first right end joint 101, and the second right end joint. 102 and the left end joint portion 103 may be located at a position horizontally reversed with respect to the Z axis of the airbag 40B of FIG. In FIG. 11, arrows C1, C2, C3, and C4 indicate directions when the airbag 40E accommodated in the backrest 14 is inflated and deployed, respectively, the rear side of the vehicle, the lower side of the vehicle, the front side of the vehicle, It refers to the upper side of the vehicle. FIG. 11 shows an example of a form in which the third chamber 43 houses the inflator 30 so that the longitudinal direction of the inflator 30 is the vertical direction of the airbag 40E. Note that “left and right” in FIG. 11 represents the left and right when the airbag 40E is viewed from the second panel 57 side, and “left and right” in FIG. 8 represents the airbag 40B from the first panel 56 side. Represents the left and right when facing each other.

  Further, the bonding or welding at the joint may be partial. That is, a part where a part of the joining part is joined by adhesion or welding may be used. For example, in FIG. 8, the joining parts 61, 62, 63, 64, 101, 102, 103 may be joined by adhesion or welding, and the joining part 60 may be joined by stitching. Alternatively, the joint portions 61, 62, 63, 64, 101, 102, 103 and the joint portion 60 from the lower outer peripheral edge portion 53 to the left outer peripheral edge portion 54 are joined together by adhesion or welding, and from the upper outer peripheral edge portion 52. The joint 60 over the right outer peripheral edge 55 may be joined by sewing. Alternatively, the joint portions 61, 62, 63, 64, 101, 102, 103 are joined by adhesion or welding, and joined from the lower outer peripheral edge portion 53 to the upper outer peripheral edge portion 52 via the left outer peripheral edge portion 54. The part 60 may be joined by adhesion or welding, and the joint part 60 of the right outer peripheral edge part 55 may be joined by sewing.

  Moreover, the site | part which joins both panels with the tether which connects a 1st panel and a 2nd panel may be sufficient as at least 1 junction part of a right junction part, a lower junction part, and a left junction part. In FIG. 12, the right joining portion 61 is joined by the right tether 81 that connects the first panel 56 and the second panel 57, and the left joining portion 63 is the left side that connects the first panel 56 and the second panel 57. The form joined by the tether 83 is illustrated. FIG. 14 illustrates a form in which the lower joint portion 62 is joined by the lower tether 85 that connects the first panel 56 and the second panel 57. The shape of the tether may be a string shape or a planar shape. Adjacent chambers are separated by a tether.

  In addition, an opening through which gas ejected from the inflator 30 flows may be formed in at least one of the right joint, the lower joint, and the left joint. FIG. 13 illustrates a form in which the opening 81 a is formed in the right tether 81 and the opening 83 a is formed in the left tether 83. For example, as shown by the arrows in the figure, the gas ejected from the inflator 30 flows into the fourth chamber 44 from the first chamber 41 through the opening 81a, and flows from the fourth chamber 44 through the opening 83a. Into the third chamber 43. FIG. 15 illustrates a form in which the opening 85 a is formed in the lower tether 85. For example, as shown by the arrow in the figure, the gas ejected from the inflator 30 flows from the second chamber 42 into the fourth chamber 44 through the opening 85a.

  The distance a between the first panel and the second panel in the inflated and deployed state of the airbag at the position of at least one of the right joint and the left joint is zero or zero. May be larger. 12 and 13 show the distance a between the right joint 61 of the first panel 56 and the right joint 61 of the second panel 57, and the left joint 63 of the first panel 56 and the second panel. An example is shown in which the distance a between the 57 and the left joint 63 is greater than zero. Further, at the position of the lower joint portion, the distance b between the first panel and the second panel when the airbag is inflated and deployed may be zero or larger than zero. 14 and 15 illustrate a form in which the distance b between the lower joint portion 62 of the first panel 56 and the right joint portion 62 of the second panel 57 is greater than zero.

  The joining method at the joint may be a combination of stitching and adhesion or welding. These joining methods may be combined with joining by a tether.

1, 1A, 1B, 1C, 1D, 1E Airbag device 10 Crew 11, 12 Seat 13 Seat 14 Back 15 Headrest 16 Seat frame 17, 18 Body side 19 Center console 20 Vehicle 21 Side 22 outside the vehicle width direction Side part 30 in the vehicle width direction Inflator 31 Upper end 32 Lower end 33 Main body 34 Attachment leg 35 Nut 36 Cover 37 Attachment holes 40, 40B, 40C, 40D, 40E Airbag 41 First chamber 42 Second chamber 43 Third Chamber 44 Fourth chamber 45 Fifth chamber 46 Upper expansion portion 47 Middle upper expansion portion 48 Middle lower expansion portion 49 Lower expansion portion 52 Upper outer peripheral portion 53 Lower outer peripheral portion 54 Left outer peripheral portion 55 Right outer peripheral portion Part 56 First panel 57 Second panel 61 Right joint (an example of the first right joint)
62 Lower joint 63 Left joint 64 Upper right joint (an example of a second right joint)
65 Non-joint part 71 Top part 81 Right side tether 83 Left side tether 85 Lower side tether 89 Fold 101 First right end joint 102 Second right end joint 103 Left end joint F1, F2 Impact W Vehicle width direction

Claims (9)

A first panel and a second panel;
The outer peripheral edge of the first panel and the outer peripheral edge of the second panel are joined in a state where the first panel and the second panel are overlapped, and the backrest of the seat of the vehicle is An air bag stored inside in the vehicle width direction,
A right joint that joins the first panel and the second panel along the right outer peripheral edge of the airbag;
A lower joint that joins the first panel and the second panel along a lower outer peripheral edge of the airbag;
A left joint that joins the first panel and the second panel along the left outer peripheral edge of the airbag;
A first chamber that expands between the right outer periphery and the right joint;
A second chamber that expands between the lower outer peripheral edge and the lower joint;
A third chamber that expands between the left outer peripheral edge and the left joint;
An airbag comprising: a fourth chamber that is inflated between the right joint and the left joint and between the lower joint and the upper outer peripheral edge of the airbag.   The airbag according to claim 1, wherein the right joint, the lower joint, and the left joint are continuous. When the horizontal width of the first chamber is D1, the vertical width of the second chamber is D2, and the horizontal width of the third chamber is D3,
The airbag according to claim 1 or 2, wherein (D1 / D2) is 0.8 or more and 1.2 or less, and (D3 / D2) is 0.8 or more and 1.2 or less. When the width in the left-right direction of the fourth chamber is D4,
The airbag according to any one of claims 1 to 3, wherein (D3 / D4) is not less than 0.4 and not more than 1.6. The right joint has a first right joint and a second right joint,
5. The first chamber according to claim 1, wherein the first chamber communicates with the fourth chamber at a non-joint portion between the first right joint portion and the second right joint portion. The described airbag. An annular first right end joint that is connected to an end of the first right joint and joins the first panel and the second panel;
An annular second right end joint connected to an end of the second right joint and joining the first panel and the second panel;
The airbag according to claim 5, wherein the first right end joint portion and the second right end joint portion are not positioned on a straight line in the left-right direction. An annular left end joint that is connected to an end of the left joint and joins the first panel and the second panel;
The airbag according to claim 6, wherein the first right end joint, the second right end joint, and the left end joint are not positioned on a straight line in the left-right direction. An annular right end joint that is connected to an end of the right joint and joins the first panel and the second panel;
An annular left end joint that is connected to an end of the left joint and joins the first panel and the second panel;
The airbag according to any one of claims 1 to 4, wherein the right end joint and the left end joint are not positioned on a straight line in the left-right direction.   An airbag device comprising: the airbag according to any one of claims 1 to 8; and an inflator accommodated in the first chamber for inflating and deploying the airbag.

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