JP5120354B2 - Airbag device - Google Patents

Description

  The present invention relates to an airbag apparatus including a first bag that restrains an upper body of an occupant and a second bag that restrains a knee.

  An airbag device is known in which an airbag for restraining a knee is connected to an airbag for restraining the upper body of an occupant (for example, see Patent Document 1). There is also known an airbag device that simultaneously inflates and deploys an airbag for restraining the upper body of an occupant and an airbag for restraining a knee by gas supply from a common pressure accumulator (for example, Patent Document 2).

Japanese Utility Model Publication No.7-17662 JP-A-51-23917

  By the way, the point that the airbag for restraining the knee before the airbag for restraining the upper body is satisfactorily deployed in front of the knee is not disclosed in the above-mentioned documents, and this point is improved. There is room for.

  An object of the present invention is to obtain an airbag device that can be deployed well in front of an occupant's knees prior to the first bag.

  The airbag device according to the first aspect of the present invention includes a first bag that restrains an upper body of a vehicle occupant from the front side in the vehicle front-rear direction by being inflated and deployed upon receiving gas supply, and the first bag. The second bag that restrains the occupant's knee from the front side in the vehicle front-rear direction by being inflated and deployed upon receiving gas supply, and is folded together with the first bag and the second bag from the inflator And is extended so as to extend rearward in the vehicle front-rear direction and upward in the vehicle vertical direction and folded back to the front side in the vehicle front-rear direction and lower in the vehicle vertical direction by the gas supply from the inflator. A flexible gas flow path member for supplying the gas from the inflator to the second bag at the tip side, and the gas flow path member With both ends being supported on the gas supply side of the definitive said inflator includes a belt-shaped member to be wound around the folded portion of the gas flow path member which is expanded, the.

  In the airbag device according to the first aspect, for example, when gas is supplied from the inflator during a frontal collision of the vehicle, the gas flow path member is inflated and deployed by the gas from the inflator. And gas is supplied to the 1st bag from the middle part of this gas channel member, and gas is supplied to the 2nd bag from the front end side of a gas channel member. In the airbag device in which gas is directly supplied to the first and second bags by the gas flow path member, the second bag having a relatively small capacity is deployed prior to the first bag. Then, the deployed second bag restrains the occupant's knee, and the deployed first bag restrains the occupant's upper body.

  Here, in this airbag apparatus, the intermediate part of the strip | belt-shaped member with which both ends were supported by the gas supply side of a gas flow path member is wound around the folding | turning part of the gas flow path member by which the expansion | deployment was carried out. For this reason, the gas flow path member having the folded shape is supported by the belt-shaped member from the outer peripheral side of the folded portion, and is prevented from extending linearly. As a result, in the airbag device, the second bag that receives the gas supply from the front end side of the gas flow path member is stably supplied with the gas via the gas flow path member. Inflated and deployed in a stable posture in a short time.

  Thus, in the airbag device according to the first aspect, the second bag can be satisfactorily deployed in front of the occupant's knees prior to the first bag.

  According to a second aspect of the present invention, there is provided an air bag device comprising: a first bag that restrains an upper body of a vehicle occupant from the front side in the vehicle front-rear direction by being inflated and deployed upon receiving gas supply; The second bag that restrains the occupant's knee from the front side in the vehicle front-rear direction by being inflated and deployed upon receiving gas supply, and is folded together with the first bag and the second bag from the inflator And is extended so as to extend rearward in the vehicle front-rear direction and upward in the vehicle vertical direction and folded back to the front side in the vehicle front-rear direction and lower in the vehicle vertical direction by the gas supply from the inflator. A flexible gas flow path member for supplying the gas from the inflator to the second bag at the tip side, and the gas flow path member With both ends on the gas supply side of the definitive said inflator is supported, and a, a belt-shaped member to receive a load by gas from the inflator acting on the gas flow path member said deployed in the intermediate portion.

  In the airbag device according to the second aspect, for example, when gas is supplied from the inflator during a frontal collision of the vehicle, the gas flow path member is inflated and deployed by the gas from the inflator. And gas is supplied to the 1st bag from the middle part of this gas channel member, and gas is supplied to the 2nd bag from the front end side of a gas channel member. In the airbag device in which gas is directly supplied to the first and second bags by the gas flow path member, the second bag having a relatively small capacity is deployed prior to the first bag. Then, the deployed second bag restrains the occupant's knee, and the deployed first bag restrains the occupant's upper body.

  Here, in this airbag device, the load acting on the gas flow path member due to the gas (gas flow) from the inflator is received by the intermediate portion of the belt-shaped member whose both ends are supported on the gas supply side of the gas flow path member. . That is, the gas flow path member having the folded shape is supported by the belt-shaped member from the outer peripheral side of the folded portion, and is prevented from extending linearly. As a result, in the airbag device, the second bag that receives the gas supply from the front end side of the gas flow path member is stably supplied with the gas via the gas flow path member. Inflated and deployed in a stable posture in a short time.

  Thus, in the airbag device according to the second aspect, the second bag can be satisfactorily deployed in front of the occupant's knees before the first bag.

  The airbag device according to a third aspect of the present invention is the airbag device according to the first or second aspect, wherein the length of the belt-shaped member is a portion of the gas channel member covered by the belt-shaped member. It is set to be shorter than the length in plan view when deployed without being restricted by the belt-like member.

  In the airbag device according to the third aspect, the folded gas flow path member is inflated and deployed so as to be loosened on the inner peripheral side because the belt-like member restrains the development in the direction of increasing the outer diameter. As a result, the folded gas flow path member can reduce stress concentration on the inner peripheral side, and can supply gas to the second bag more stably.

  The airbag device according to a fourth aspect of the present invention is the airbag device according to any one of the first to third aspects, wherein an intermediate portion of the belt-shaped member is joined to the gas flow path member by sewing. ing.

  In the airbag device according to the fourth aspect, since the belt-like member is joined (sewn) to the gas flow path member by sewing, the positional deviation of the belt-like member with respect to the gas flow path member is suppressed.

  An airbag apparatus according to a fifth aspect of the present invention is the airbag apparatus according to the fourth aspect, wherein an intermediate portion of the belt-shaped member is a vehicle vertical direction with respect to a gas supply port to the first bag in the gas flow path member. Located on the underside.

  In the airbag device according to the fifth aspect, the belt-like member joined to the gas flow path member by sewing does not block the gas supply port to the first bag in the gas flow path member. In addition, the belt-like member positioned below the gas supply port to the first bag in the gas flow path member has a folded portion of the gas flow path member as compared with the configuration positioned above the gas supply port. Can support well.

  According to a sixth aspect of the present invention, there is provided the airbag apparatus according to the fourth or fifth aspect, wherein the lower edge in the vehicle vertical direction at the intermediate portion of the belt-shaped member is the first bag and the second bag. It is arranged close to the boundary part.

  In the airbag device according to the sixth aspect, the belt-like member positioned above the boundary portion between the first bag and the second bag can favorably support the folded portion of the gas flow path member.

  As described above, the airbag device according to the present invention has an excellent effect that the second bag can be satisfactorily deployed in front of the occupant's knees before the first bag.

It is a sectional side view which shows the deployment state of the airbag in the airbag apparatus which concerns on the 1st Embodiment of this invention. It is side sectional drawing which expands and shows the strap which comprises the airbag apparatus which concerns on the 1st Embodiment of this invention. It is a plane sectional view expanding and showing a strap which constitutes an air bag device concerning a 1st embodiment of the present invention. It is side sectional drawing which expands and shows the strap which comprises the airbag apparatus which concerns on the 2nd Embodiment of this invention. It is a plane sectional view expanding and showing a strap which constitutes an air bag device concerning a 2nd embodiment of the present invention.

  A passenger seat airbag apparatus 10 as an airbag apparatus according to a first embodiment of the present invention will be described with reference to FIGS. In addition, arrow FR, arrow UP, and arrow W appropriately described in each figure respectively indicate the vehicle V to which the passenger seat airbag device 10 is applied, the vehicle front direction (traveling direction), the upward direction, and the vehicle width direction of the passenger seat 12. Is shown. Further, in the following description, when the shape of the airbag 20 (its constituent part) is described, the shape in the inflated and deployed state is referred to unless otherwise specified.

  FIG. 1 is a schematic side cross-sectional view of a front portion in a passenger compartment C of an automobile V in an operating state of a passenger seat airbag device 10. As shown in this figure, a passenger seat 12 as a vehicle seat is disposed in the front part of the passenger compartment C. The passenger seat 12 includes a seat cushion 12A for the occupant P to sit forward and a seat back 12B that supports the seated occupant P of the seat cushion 12A from the rear of the vehicle.

  A windshield glass 14 that defines the front end of the vehicle in the passenger compartment C is disposed in front of the passenger seat 12. An instrument panel 16 is provided below the vehicle with respect to the windshield glass 14. The instrument panel 16 protrudes toward the passenger seat 12, and the seated occupant P of the passenger seat 12 puts his feet under the instrument panel 16. Therefore, the seated occupant P of the passenger seat 12 is configured to bring the knee K close to the instrument panel 16.

  The passenger seat airbag apparatus 10 includes an airbag module 18 disposed in the instrument panel 16. The airbag module 18 includes an airbag 20 described later, an inflator 22 for supplying gas to the airbag 20, and an airbag case 24 holding (partially containing) the airbag 20 and the inflator 22. It is configured. The airbag module 18 is held by an attachment portion 16 </ b> A provided on the instrument panel 16 in the airbag case 24.

  In this embodiment, as shown in FIG. 1, the airbag 20 includes a main bag 26 as a first bag for protecting the upper body U of the seated occupant P, and a sub bag 28 as a second bag for protecting the knee K. And have. For this reason, in the passenger seat airbag device 10, the airbag module 18 is provided in the vicinity of the rearmost portion of the vehicle in the instrument panel 16 so as to face the vehicle rearward and upward. Specifically, in the airbag device 10 for the passenger seat, the airbag case 24 of the airbag module 18 is held by the mounting portion 16A of the instrument panel 16 in a posture that opens toward the rear of the vehicle and upward of the vehicle. Yes.

  The airbag case 24 holds (partially accommodates) the airbag 20 in a folded state as shown by a two-dot chain line in FIG. The airbag 20 is kept in a folded state by being wrapped in a holding sheet or the like (not shown). The inflator 22 is fixedly held by the airbag case 24 in a state in which a part including the gas ejection port 22 </ b> A is inserted into the airbag 20. In this embodiment, the inflator 22 is a so-called disk-type inflator, and a sufficient gas capacity is ensured for the airbag 20 having the main bag 26 and the subbag 28 as described above.

  The main bag 26 of the airbag 20 is inflated and deployed between the windshield glass 14 and the instrument panel 16 and the upper body U of the seated occupant P, and restrains the relative movement of the upper body U forward of the vehicle. It has become. In this embodiment, a vent hole 25 for adjusting internal pressure is formed in the main bag 26. The sub bag 28 is inflated and deployed between the instrument panel 16 and the knee K, and restrains the relative movement of the knee K forward of the vehicle. The main bag 26 and the sub bag 28 of the airbag 20 are integrally formed.

  Specifically, the main bag 26 is formed so as to be inflated and deployed in a bag shape by a base cloth 30 that constitutes an upper portion and an intermediate portion of the airbag 20 in the vehicle vertical direction. In this embodiment, although not shown, the main bag 26 is a so-called twin chamber structure airbag in which left and right bags adjacent in the vehicle width direction are connected. The main bag 26 is formed such that the rear ends of the left and right bags (chambers) restrain the left and right shoulders (or the vicinity thereof) of the seated occupant P, respectively.

  The sub bag 28 is formed in a bag shape that opens upward in the vehicle with the base cloth 32, and the opening edge is joined to the vehicle lower opening edge of the main bag 26 by sewing or the like. Thereby, the airbag 20 has comprised the big bag shape as a whole. The base fabric 32 is different from the base fabric 30 in that the surface is subjected to a texture seal process such as a silicon coat, and prevents gas leakage from the main bag 26 via the texture (suppresses the base fabric 30). ). The silicon coat for holding the internal pressure of the sub bag 28 is preferably applied to the inner surface of the sub bag 28 from the viewpoint of preventing gas leakage.

  As described above, the airbag 20 deployed as a large bag as a whole has a tether 34 as a cloth-like material for partitioning (separating) the interior into a chamber of the main bag 26 and a chamber of the subbag 28. The tether 34 has a cloth shape and regulates the expansion of the sub bag 28 in the vehicle front-rear direction as shown in FIGS. 1 and 2. In this embodiment, the tether 34 is joined to the sewing part of the base fabric 30 and the base fabric 32 by sewing etc. as shown in FIG. Further, a tether or a strap for restricting the expansion (thickness) of the sub-bag 28 in the vehicle front-rear direction may also be provided in a portion that is a substantially middle portion in the vehicle vertical direction in the deployed state in the sub-bag 28.

  The airbag 20 constituting the passenger seat airbag apparatus 10 includes an inner tube 35 as a flexible gas flow path member that guides the gas of the inflator 22 to the main bag 26 and the subbag 28. The inner tube 35 is opened by a base fabric 36, which is the same fabric as the base fabric 30, independent of the main bag 26 and the sub bag 28, in front of the vehicle and downward of the vehicle, as shown in FIG. It is configured as a bag body that is inflated and deployed in a substantially “U” shape that is a folded shape. Specifically, as described above, the inner tube 35 includes an upper portion 38 extending in the opening direction from the airbag case 24 that opens rearward and upward of the vehicle, and from the upper portion 38 to the front of the vehicle and to the lower side of the vehicle. The lower part 40 which is unfolded so as to be folded is configured as a main part.

  A lower portion 40 of the inner tube 35 penetrates the tether 34, and a gas supply port 40A for supplying gas to the sub bag 28 is formed at the tip thereof. On the other hand, a gas supply port 38 A for supplying gas to the main bag 26 is formed in the vicinity of the folded portion of the lower portion 40 in the upper portion 38 of the inner tube 35, that is, on the main bag 26 side with respect to the tether 34. In this embodiment, as shown in FIG. 2, the gas supply port 38 </ b> A is formed as a through hole penetrating the base cloth 36 on both sides in the vehicle width direction of the upper portion 38 of the inner tube 35. Thus, in the passenger seat airbag apparatus 10, gas is supplied into the main bag 26 from the upper portion 38 of the inner tube 35 toward both sides in the vehicle width direction.

  The inner tube 35 includes a pair of base fabrics 36A and 36B each having a substantially “U” shape as viewed from the side, and a sewing portion S at a substantially central position in the vehicle width direction of the inner tube 35 as shown in FIG. Is formed into a cylindrical shape of the “U” shape.

  Further, in the passenger airbag device 10, a check valve (one-way valve) 42 is formed around the gas supply port 40 </ b> A in the lower portion 40 of the inner tube 35 as gas discharge suppression means. The check valve 42 has a cloth piece 42A that covers the gas supply port 38A from the inside of the sub bag 28, and allows gas supply to the sub bag 28 from the upper part 38 through the gas supply port 38A. On the other hand, the check valve 42 is configured such that when the internal pressure (dynamic pressure) of the sub bag 28 becomes higher than the internal pressure of the upper portion 38, the cloth piece 42A closes the gas supply port 38A by the internal pressure. In order to facilitate understanding of the configuration of the check valve 42, the gas supply port 40 </ b> A in the non-operating state of the check valve 42 is opened in FIG. 1, and the gas supply port 40 </ b> A by the check valve 42 in FIG. 2. The closed state is illustrated.

  The passenger seat airbag device 10 includes a strap 44 as a belt-like member that supports the inner tube 35 from the rear of the vehicle. The strap 44 is made of the same fabric as the base fabrics 30 and 36, and both ends in the longitudinal direction are fixedly supported in the vicinity of the gas inlet 35 </ b> A from the inflator 22 in the inner tube 35. In this embodiment, as shown in FIG. 3, both ends 44 </ b> A of the strap 44 are fastened together with the opening end of the gas inlet 35 </ b> A of the inner tube 35 between the inflator 22 and the bag retainer 46. Note that both ends 44A of the strap 44 may be joined by sewing or the like in the vicinity of the gas inlet 35A of the inner tube 35, and the gas in the inner tube 35 indirectly through the inflator 22, the bag retainer 46, and the airbag case 24. It is good also as a structure supported by the inlet 35A side.

  As shown in FIG. 2, the intermediate portion 44 </ b> B of the strap 44 is wound around the inner tube 35 so as to straddle the upper portion 38 and the lower portion 40 of the inner tube 35. That is, the strap 44 according to this embodiment is wound around the folded portion 35 </ b> B of the inner tube 35. Further, in this embodiment, the intermediate portion 44B of the strap 44 is joined to the folded portion 35B of the inner tube 35 by sewing (not shown).

  Further, as shown in FIG. 2, the strap 44 has an upper edge 44U in the vehicle vertical direction located on the vehicle lower side with respect to the gas supply port 38A to the main bag 26, and a lower edge 44L at the main bag 26 and the sub bag 28. It is located in the vicinity of the tether 34 that forms a boundary with.

  Furthermore, the length between 44A supported by the inner tube 35 in the strap 44 is such that the portion of the inner tube 35 covered with the strap 44 in the plan view is a “U” shape (the cross section shown in FIG. 3). It is set to be shorter than the length when it is inflated and deployed in the absence. Thereby, the inner tube 35 is configured such that its development is restrained by the strap 44.

  Further, as shown in FIG. 1, an airbag door 48 that is broken and opened by the inflation and deployment pressure of the airbag 20 is formed at a portion of the instrument panel 16 to which the airbag module 18 is attached. The airbag door 48 according to this embodiment is opened up and down around the hinge portion when the instrument panel 16 is cleaved at a groove-like tear line formed on the inner surface thereof, and the instrument panel 16 has an opening. It comes to form. Through this opening, the airbag 20 is allowed to be inflated and deployed outside the instrument panel 16, that is, in the passenger compartment C.

  In the passenger-side airbag device 10 described above, for example, when a frontal collision of the vehicle V is detected or predicted to be unavoidable based on an output of a collision sensor (not shown), an airbag as a control device (not shown) is used. The ECU operates the inflator 22.

  Next, the operation of this embodiment will be described.

  In the passenger airbag device 10 configured as described above, when a frontal collision of the automobile V is detected or predicted based on a signal from the collision sensor, the airbag ECU activates (ignites) the inflator 22. Then, the airbag 20 that has received the gas supply from the inflator 22 is inflated in the instrument panel 16 and inflated and deployed in the vehicle compartment C through an opening formed by deploying the airbag door 48 with the deployment pressure.

  At this time, the inner tube 35 supplied with the gas of the inflator 22 is first inflated and deployed. The gas from the inflator 22 is supplied to the main bag 26 through a gas supply port 38A formed in the upper portion 38 of the inner tube 35 and is supplied to the sub bag 28 through a gas supply port 40A formed in the lower portion 40.

  Then, the main bag 26 is first inflated and deployed in the vehicle width direction by the gas pressure of the gas supplied (injected) in the vehicle width direction. The subbag 28 is inflated and deployed between the instrument panel 16 and both knees K of the occupant P by gas supply through the gas supply port 40A. On the other hand, the deployment of the main bag 26 having a relatively large capacity is completed in front of the vehicle with respect to the upper body U of the occupant P after the deployment of the sub bag 28 is completed.

  As described above, in the passenger seat airbag apparatus 10, the inner tube 35 is provided in the airbag 20 including the main bag 26 and the subbag 28. Gas is supplied directly (independently) to each of the main bag 26 and the sub-bag 28. As a result, in the passenger seat airbag device 10, the relatively small-capacity sub-bag 28 is inflated and deployed in a short time from the operation of the inflator 22. Therefore, in the passenger seat airbag device 10, the subbag 28 can be inflated and deployed in a short time from the detection of the frontal collision in front of the vehicle with respect to the knee K of the seated occupant P with a small space (stroke) in the vehicle longitudinal direction. .

  The sub-bag 28 restrains the knee K and reduces the load acting on the knee K from the instrument panel 16 side. That is, the knee K of the seated occupant P is protected. In particular, in the passenger airbag device 10, the check valve 42 is provided on the gas supply port 40 </ b> A side in the lower portion 40 of the inner tube 35, so that the internal pressure of the sub-bag 28 increases as the knee K is restrained. The check valve 42 closes the gas supply port 40A. For this reason, a decrease in the internal pressure (gas discharge) of the sub-bag 28 accompanying the restraint of the knee K is suppressed, and the knee K of the seated occupant P is better protected.

  On the other hand, the upper body U of the occupant P is restrained by the inflated and deployed main bag 26 to absorb shock. Accordingly, the passenger P is well protected by the passenger seat airbag device 10. In particular, in the passenger seat airbag apparatus 10, gas is supplied toward both sides in the vehicle width direction in the main bag 26 through the left and right gas supply ports 38A. For this reason, compared with the configuration in which gas is supplied to the rear of the vehicle, the deployment force (deployment speed) of the main bag 26 toward the rear of the vehicle is suppressed, and the load is reduced when restraining the upper body U of the seated occupant P. Is done.

  In the passenger seat airbag device 10, the inner tube 35 inflated and deployed as described above deploys the strap 44 along with its deployment, and the intermediate portion 44B of the strap 44 is wound around the folded portion 35B. . The strap 44 supports a part of the load acting on the inner tube 35 (the folded portion 35B) by the gas (gas flow) from the inflator 22. As a result, the inner tube 35 is prevented or effectively prevented from having its folded portion 35B extending linearly or having the lower portion 40 swinging up and down (front and rear) starting from the vicinity of the folded portion 35B. Is done.

  For this reason, in the passenger seat airbag apparatus 10, the gas is supplied to the sub-bag 28 with the lower portion 40 of the inner tube 35 in a stable posture.

  Further, since the strap 44 supports a part of the load acting on the inner tube 35, it is possible to suppress stress concentration at a specific portion of the inner tube 35. Specifically, the stress in the inner peripheral portion 35C of the folded portion 35B where stress concentration tends to occur in the inner tube 35 is relieved. Moreover, in the passenger seat airbag device 10, the length of the strap 44 is shorter than the length of the portion of the inner tube 35 covered by the strap 44, so that the inner peripheral portion 35 </ b> C of the folded portion 35 </ b> B of the inner tube 35 is loosened. Is likely to occur, and the stress in the inner peripheral portion 35C is further relaxed. As a result, in the passenger seat airbag device 10, partial breakage of the sewing portion S in the inner peripheral portion 35 </ b> C of the folded portion 35 </ b> B of the inner tube 35 is prevented, and gas is stably supplied from the inner tube 35 to the subbag 28. Supplied.

  As described above, in the passenger airbag device 10, the sub bag 28 is deployed between the instrument panel 16 and the knees K of the occupant P in a short time and in a stable posture from the operation of the inflator.

  Thus, in the passenger seat airbag apparatus 10 according to the present embodiment, the sub bag 28 can be advanced in front of the main bag 26 and in front of the knees K of the occupant P.

  Further, in the passenger seat airbag device 10, the strap 44 is joined to the folded portion 35 </ b> B of the inner tube 35 by sewing, so that the strap 44 does not shift from the inner tube 35 and effectively functions as described above. Fulfill.

  Moreover, since the strap 44 sewn on the inner tube 35 is deployed below the gas supply port 38A, the strap 44 does not block the gas supply port 38A, and proper deployment of the main bag 26 is ensured. . Further, the strap 44 disposed below the gas supply port 38A can favorably support the folded portion 35B of the inner tube 35 as compared with the configuration disposed above the gas supply port 38A. Further, in the passenger seat airbag device 10, the lower edge 44L of the strap 44 is positioned in the vicinity of the tether 34, so that the inner tube 35 (the folded portion 35B) tends to extend linearly by the strap 44. Can be effectively suppressed.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. Note that components / portions that are basically the same as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and description thereof is omitted.

  FIG. 4 is a side cross-sectional view corresponding to FIG. 2 showing a main part of a passenger seat airbag device 50 according to the second embodiment of the present invention. As shown in this figure, the airbag 52 constituting the passenger seat airbag device 50 is formed integrally with the base fabric 36 instead of the separate strap 44 of the base fabric 36 constituting the inner tube 35. It differs from the passenger airbag apparatus 10 according to the first embodiment in that it includes a strap 54.

  Specifically, as shown in FIG. 5, the inner tube 35 is formed by joining two base fabrics 36 </ b> C and 36 </ b> D with a sewing portion S at a substantially center in the vehicle width direction of the inner tube 35. It is formed in a “U” -shaped cylindrical shape. In the strap 54, the extended portions 54A and 54B extending from the sewing portion by the sewing portion S in the base fabrics 36C and 36D are folded back, and the free ends of the extended portions 54A and 54B are in the vicinity of the gas inlet 35A. It is comprised by being fixedly supported by the inner tube 35 (illustration omitted). That is, the strap 54 according to the present embodiment is an integral structure with respect to the inner tube 35 and can be regarded as a left and right divided structure.

  Further, as shown in FIG. 4, the strap 54 has an upper edge 54 </ b> U in the vehicle vertical direction located on the vehicle lower side with respect to the gas supply port 38 </ b> A to the main bag 26, and a lower edge 54 </ b> L at the main bag 26 and the subbag 28. It is located in the vicinity of the tether 34 that forms a boundary with.

Other parts of the passenger seat airbag device 50 are configured in the same manner as the corresponding components in the passenger seat airbag device 10, including portions not shown.

  Therefore, the passenger seat airbag device 50 according to the second embodiment can basically obtain the same effect by the same operation as the passenger seat airbag device 10 according to the first embodiment.

  In the above-described embodiment, an example in which the straps 44 and 54 are formed as one band-shaped member has been described. However, the present invention is not limited to this, and for example, instead of the straps 44 and 54, a width (vehicle It is good also as a structure provided with the some strip | belt-shaped member (strap) spaced apart in the up-down direction.

  Further, in the above-described embodiment, an example in which the strap 44 is located below the gas supply port 38A has been shown. However, the present invention is not limited to this, and for example, a communication hole through which the strap 44 communicates with the gas supply port 38A is provided. It is good also as a structure to have.

  Furthermore, in the above-described embodiment, the example in which the check valve 42 is provided as the internal pressure holding (gas discharge suppression) means of the sub-bag 28 is shown, but the present invention is not limited to this, for example, as the internal pressure holding means, You may employ | adopt the string etc. which close the lower part 40 of the inner tube 35 with the expansion | deployment deployment of the main bag 26 or the subbag 28. FIG.

  Furthermore, in the above-described embodiment, an example is shown in which the sub bag 28 is deployed ahead of the main bag 26 due to a difference in capacity between the main bag 26 and the sub bag 28 that is supplied from the inflator 22 but is directly supplied. However, the present invention is not limited to this. For example, the gas supply port 38A is closed with a tear seam or the like that is broken by a gas pressure of a predetermined value or more, and the internal pressure of the inner tube 35 is increased (the sub bag 28 A deployment delay structure in which deployment of the main bag 26 is started in the deployment process or after completion of deployment may be provided.

  In the above-described embodiment, an example in which the main bag 26 is a so-called twin-chamber airbag in which the left and right bags are connected has been described. However, the present invention is not limited to this. It is good also as a structure which is what is called a single chamber structure airbag which has one chamber.

  Further, in each of the above-described embodiments, the example in which the airbag apparatus according to the present invention is applied to the airbag apparatus 10 for the passenger seat is shown. However, the present invention is not limited to this, for example, the airbag apparatus according to the present invention. The bag device can be applied to a seat in the center in the vehicle width direction among seats in which three passengers can be seated in the vehicle width direction. Further, such a central seat can be regarded as being included in the passenger seat in the present invention.

10 Airbag device for passenger seat 22 Inflator 26 Main bag (first bag)
28 Sub bag (second bag)
34 tether (boundary between the first bag and the second bag)
35 Inner tube (gas flow path member)
35B Folding part 38A Gas supply port 44 Strap (band-like member)
50 Airbag device for passenger seat 54 Strap (band-like member)

Claims (6)

A first bag that restrains the upper body of the vehicle occupant from the front side in the vehicle front-rear direction by being inflated and deployed upon receiving gas supply;
A second bag that has a smaller capacity than the first bag, is inflated and deployed by receiving gas supply, and restrains the occupant's knee from the front side in the vehicle front-rear direction;
The bag is folded together with the first bag and the second bag, and extends toward the rear side in the vehicle longitudinal direction and the upper side in the vehicle vertical direction by the gas supply from the inflator, and on the front side in the vehicle longitudinal direction and below the vehicle vertical direction. A flexible gas flow path member that is unfolded so as to supply the gas from the inflator to the first bag at the intermediate portion and supply the gas from the inflator to the second bag at the distal end side. When,
Both ends are supported on the gas supply side from the inflator in the gas flow path member, and a belt-shaped member wound around a folded portion of the gas flow path member that is unfolded,
An airbag device comprising: A first bag that restrains the upper body of the vehicle occupant from the front side in the vehicle front-rear direction by being inflated and deployed upon receiving gas supply;
A second bag that has a smaller capacity than the first bag, is inflated and deployed by receiving gas supply, and restrains the occupant's knee from the front side in the vehicle front-rear direction;
The bag is folded together with the first bag and the second bag, and extends toward the rear side in the vehicle longitudinal direction and the upper side in the vehicle vertical direction by the gas supply from the inflator, and on the front side in the vehicle longitudinal direction and below the vehicle vertical direction. A flexible gas flow path member that is unfolded so as to supply the gas from the inflator to the first bag at the intermediate portion and supply the gas from the inflator to the second bag at the distal end side. When,
Both ends are supported on the gas supply side from the inflator in the gas flow path member, and a belt-shaped member that receives a load due to the gas from the inflator acting on the gas flow path member developed in the middle part,
An airbag device comprising:   The length of the band-shaped member is set to be shorter than the length in a plan view when the portion of the gas flow path member covered by the band-shaped member is deployed without being restricted by the band-shaped member. Or the airbag apparatus of Claim 2.   The airbag device according to any one of claims 1 to 3, wherein an intermediate portion of the belt-like member is joined to the gas flow path member by sewing.   5. The airbag device according to claim 4, wherein an intermediate portion of the belt-shaped member is disposed on a lower side in a vehicle vertical direction with respect to a gas supply port to the first bag in the gas flow path member.   The airbag device according to claim 4 or 5, wherein a lower edge in a vehicle vertical direction in an intermediate portion of the belt-shaped member is disposed in proximity to a boundary portion between the first bag and the second bag.

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