Air bag device

Abstract

To provide an air bag device which can protect a crew member stably even if he / she is in a non-stationary seating state.SOLUTION: An air bag device 1 comprises a case body 3, an air bag 4 which is stored in such a state as to be folded in the case body 3, a holding sheet 23 for holding folded shape of the air bag 4, and a regulation sheet 37 which regulates expansion of the air bag 4. The holding sheet 23 includes a side part flap parts 30, 31 which are overlapped from left and right at viewing from a crew member against the air bag 4, respectively, and an end part flap part 32 which is overlapped from a side opposite to crew member against the side part flap parts 30, 31. The regulation sheet 37 is overlapped from crew member side against the end part flap part 32 and at the same time includes a roll part 39 on tip part which positions in side opposite to crew member.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an airbag device including a regulation sheet for regulating the deployment of an airbag.

Background Art

[0002] Conventionally, an airbag device for a passenger in the front passenger seat disposed on an instrument panel of an automobile has been known. In this airbag device, the airbag is stored in a folded state, and at the time of a collision of the automobile, the airbag is inflated by the introduction of gas jetted from an inflator, and a part of the instrument panel is broken by the inflation pressure, and the airbag is deployed in front of the passenger in the front passenger seat who is the protection target to restrain and protect the passenger.

[0003] In such an airbag device, there is known one provided with a regulation sheet for controlling the deployment direction, deployment speed, etc. of the airbag (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The deployment behavior of the airbag is greatly affected by the folding direction and folding method of the regulation sheet. In particular, even in an unsteady seating state (so-called out-of-position (OOP) state) where the passenger is close to the instrument panel, it is required to deploy the airbag appropriately and protect stably.

[0006] The present invention has been made in view of such points, and an object thereof is to provide an airbag device that can stably protect even when the passenger is in an unsteady seating state.

Means for Solving the Problem

[0007] The airbag device according to an aspect of the present invention includes a case body, an airbag housed in a folded state in the case body, a holding sheet for holding the folded shape of the airbag, and a regulating sheet for regulating the deployment of the airbag. The holding sheet has side flap portions that are respectively overlapped from the left and right as viewed from the occupant with respect to the airbag, and end flap portions that are overlapped from the side opposite to the occupant with respect to the side flap portions. The regulating sheet is overlapped from the occupant side with respect to the end flap portions and has a roll portion at the tip end portion located on the side opposite to the occupant.

Advantages of the Invention

[0008] According to the present invention, even when the occupant is in an unsteady seating state, stable protection can be provided.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0011] In FIG. 3, reference numeral 1 denotes an airbag device. The airbag device 1 of the present embodiment is disposed inside an instrument panel portion (dashboard) 2 as an installation portion located in front of an occupant of the passenger seat S of an automobile as a vehicle, that is, in front of the occupant of the passenger seat S as a protection target, and constitutes an airbag device (PAB) 1 for the passenger seat occupant. Hereinafter, the front-rear direction (the directions of arrows FR and RR shown in each figure), the left and right side directions (the directions of arrows L and R shown in each figure), and the up-down direction (the arrows U and D shown in each figure) are based on the straight-ahead direction of the automobile in a state where the airbag device 1 is attached to the automobile. That is, the occupant side is the rear, and the non-occupant side is the front. In the present embodiment, since the side surface of the instrument panel portion 2 is inclined rearward and upward, the up-down direction (airbag deployment direction) in the airbag device 1 does not necessarily coincide with the up-down direction in the passenger compartment. However, for simplicity of explanation, they are not strictly distinguished in each explanation. Further, FIG. 3 shows an example of a right-hand drive vehicle (RHD). In the case of a left-hand drive vehicle (LHD), basically, the left and right are reversed.

[0012] As shown in FIG. 1, in the airbag device 1, an airbag 4 and an inflator 5 are attached to a case body 3, and a cover body 6, which is a protection member covering the airbag 4, is attached to the case body 3, and the airbag device 1 is attached to the instrument panel portion 2.

[0013] The case body 3 is formed in a substantially box shape. The folded airbag 4 is stored inside the case body 3. The case body 3 is provided with an opening 10. The opening 10 is formed above the front side or the upper part of the instrument panel portion 2 and faces the windshield 11 (shown in FIG. 3), which is a front glass and is a facing portion continuous with the upper part, and is normally closed by the cover body 6. Further, an attachment opening for attaching the inflator 5 and the like are formed at the bottom of the case body 3.

[0014] The airbag 4 is formed in a bag shape by members such as one or more base fabrics. A gas inlet 13 is opened in the airbag 4. A retainer 14, which is an attachment member for holding the inflator 5, is inserted into the airbag 4 from the gas inlet 13, and the airbag 4 is attached to the bottom of the case body 3 together with the inflator 5 via this retainer 14.

[0015] The retainer 14 is formed in a frame shape, and attachment bolts (stud bolts) for attaching the inflator 5 to the case body 3 together with the airbag 4 project therefrom.

[0016] The inflator 5 is formed, for example, in a disc shape, and a plurality of gas injection ports are formed on the outer peripheral surface. An igniter and a chemical agent are stored inside the inflator 5, and the igniter burns the chemical agent by an electrical signal from a control device such as an ECU transmitted through a connector connected to the bottom, so as to rapidly supply inflation gas from the gas injection ports.

[0017] The cover body 6 is formed integrally or separately with the instrument panel portion 2 by a member such as synthetic resin, and a hook portion 17 protruding outward from the side portion of the case body 3 is hooked on a mounting hole portion 16 formed on the side portion and held by the case body 3. A tear line 18, which is a weak portion (thin portion) thinner than other portions and broken by the inflation pressure of the airbag 4, is formed at a position facing the opening 10 of the case body 3 in the cover body 6. The tear line 18 is positioned facing upward, which is the deployment direction, with respect to the folded airbag 4. In the illustrated example, the tear line 18 extends in the left - right direction at the center in the front - rear direction of the cover body 6, for example, and is formed in an H - shape extending in the front - rear direction at both left and right sides.

[0018] Next, the folding shape of the airbag 4 and the like will be described.

[0019] The airbag 4 may be folded into an arbitrary shape. In the present embodiment, for example, it is configured such that two folding portions are stacked one on top of the other. In the example shown in FIG. 4(f), in the airbag 4, a first folding portion 20, which is a folding portion where gas is first introduced in communication with the gas inlet 13, is located above, and a second folding portion 21, which is a folding portion where gas is introduced following the first folding portion 20, is stacked below it. The first folding portion 20 includes a portion that constitutes the lower part of the airbag 4 in the deployed state, and the second folding portion 21 includes a portion that constitutes the upper part of the airbag 4 in the deployed state. The folding shape of the first folding portion 20 and the folding shape of the second folding portion 21 may be the same or different. For example, in the present embodiment, the first folding portion 20 is folded in an S-shaped waveform, and the second folding portion 21 is folded in a waveform. In the present embodiment, in the first folding portion 20, an introduction portion that communicates with the gas inlet 13 is located at the position of the front end portion. That is, the first folding portion 20 (airbag 4) is folded so as to expand from the front portion.

[0020] The folding shape of this airbag 4 is held by the holding sheet 23 shown in FIGS. 1 and 2. The holding sheet 23 is formed of, for example, a base fabric or the like, and flap portions extend from the holding sheet main body portion 25 in all four directions and form a cross shape in the deployed state. The holding sheet main body portion 25 is located between the folded airbag 4 and the bottom of the case body 3. In the holding sheet main body portion 25, an opening 26 that communicates with the mounting opening at the bottom of the case body 3 and into which the inflator 5 is inserted, and mounting holes 27 that are located around it and through which the mounting bolts of the retainer 14 are inserted are formed.

[0021] The flap portions extending from the holding sheet main body portion 25 are each formed in a rectangular shape. In the present embodiment, side flap portions 30, 31 that extend left and right from the holding sheet main body portion 25 and end flap portions 32, 33 that extend front and back from the holding sheet main body portion 25 are set in the flap portions.

[0022] The side flap portions 30 and 31 hold the left and right side portions of the folded shape of the airbag 4. The side flap portion 30 has a base end portion connected to the left side portion of the holding seat main body portion 25 and extends leftward from the holding seat main body portion 25. Similarly, the side flap portion 31 has a base end portion connected to the right side portion of the holding seat main body portion 25 and extends rightward from the holding seat main body portion 25.

[0023] In the present embodiment, the side flap portion 31 extends longer in the left-right direction from the holding seat main body portion 25 than the side flap portion 30, but the present invention is not limited to this. They may have the same length, or the side flap portion 30 may extend longer from the holding seat main body portion 25 than the side flap portion 31. The front-rear width of the side flap portions 30 and 31 is formed to be approximately the same as the front-rear width of the folded airbag 4 or the front-rear width inside the case body 3.

[0024] In the assembled state of the airbag device 1 or in the state of being housed in the case body 3 that holds the folded shape of the airbag 4, the side flap portion 30 has its base end portion side overlapped with the left side portion of the folded airbag 4 and is located between the airbag 4 and the cover body 6 at a position covering at least a part of the upper left side portion in the deployment direction of the folded airbag 4. The side flap portion 31 has its base end portion side connected to the holding seat main body portion 25 overlapped with the right side portion of the folded airbag 4 in the housed state of the airbag device 1 and is located between the airbag 4 and the cover body 6 at a position covering at least a part of the upper right side portion of the folded airbag 4. Preferably, the left-right width of the side flap portions 30 and 31 is set so that the upper left and right entire ranges of the airbag 4 are covered by the tip end portion sides of the side flap portions 30 and 31.

[0025] In addition, the end flap portions 32 and 33 hold both the front and rear ends of the folded shape of the airbag 4. The base end of the end flap portion 32 is continuous with the front end of the holding seat main body portion 25 and extends forward from the holding seat main body portion 25. Similarly, the base end of the end flap portion 33 is continuous with the rear end of the holding seat main body portion 25 and extends rearward from the holding seat main body portion 25. The end flap portion 32 is formed to extend longer from the holding seat main body portion 25 than the end flap portion 33. The left and right widths of the end flap portions 32 and 33 are each formed to be approximately the same as the left and right width of the folded airbag 4 or the left and right width inside the case body 3.

[0026] In the assembled state of the airbag device 1 or the state of being housed in the case body 3 that holds the folded shape of the airbag 4, the end flap portion 32 has its base end side overlapped with the front portion of the folded airbag 4 and is located between the airbag 4 and the cover body 6 at a position covering at least one of the side flap portions 30 and 31, in this embodiment, both upper portions of the side flap portions 30 and 31, of the upper portion of the folded airbag 4. The end flap portion 33 has its entire body overlapped with the rear portion of the folded airbag 4 and is located close to the upper end portion at the rear portion of the folded airbag 4 or the rear inner edge portion of the opening 10 of the case body 3. That is, for the end flap portion 33, there is basically no portion facing the deployment direction with respect to the folded airbag 4 and the side flap portions 30 and 31.

[0027] Further, the tip of the end flap portion 32 is within the front-rear width of the folded airbag 4 in the front-rear direction. That is, the tip of the end flap portion 32 is at a position that does not extend rearward with respect to the airbag 4. Preferably, a folding portion 35 is formed at the tip of this end flap portion 32, that is, the free end. The folding portion 35 is formed by folding downward, that is, toward the side flap portions 30 and 31. The folding portion 35 is located closer to the rear in the front-rear direction of the folded airbag 4 and is close to the upper rear end portion of the folded airbag 4 and the rear inner edge portion of the opening 10 of the case body 3. In the present embodiment, the folding portion 35 is formed by folding the tip of the end flap portion 32 once inward toward the base end side.

[0028] Also, the deployment behavior of the airbag 4 is restricted by the holding sheet 23 and the restricting sheet 37. The restricting sheet 37 is also called a deployment restricting sheet or a deployment adjusting sheet, etc. The restricting sheet 37 is formed in a long rectangular shape or a strip shape by, for example, a base fabric or the like. The restricting sheet 37 is formed in a longitudinal shape that is longer than the end flap portion 33 in the front-rear direction. The left-right width of the restricting sheet 37 is formed to be approximately the same as the left-right width of the folded airbag 4 or the left-right width inside the case body 3.

[0029] The restricting sheet 37 is composed of one or more sheet members. In the present embodiment, the restricting sheet 37 is configured by connecting a plurality of sheet members in the longitudinal direction. In the illustrated example, the restricting sheet 37 is composed of one sheet member 37a and another sheet member 37b. One sheet member 37a is formed longer than the other sheet member 37b.

[0030] Preferably, the restricting sheet 37 is fixed to the holding sheet 23. In the present embodiment, the restricting sheet 37 is joined and fixed to the tip of the end flap portion 33 of the holding sheet 23 by a joining portion 38 such as sewing. In the illustrated example, the front end portion of the restricting sheet 37, which is the end portion on the side opposite to the other sheet member 37b of one sheet member 37a, is fixed to the tip of the end flap portion 33 of the holding sheet 23, that is, the rear end portion which is the free end portion, by the joining portion 38.

[0031] And in the assembled state of the airbag device 1 or in the state of being housed in the case body 3 that holds the folded shape of the airbag 4, the restricting sheet 37 is in a position covering the end flap portion 32 of the holding sheet 23 in the range facing upward, which is the deployment direction of the folded airbag 4, from the rear. Also, the front end portion, which is the tip of the restricting sheet 37, is within the front-rear width of the folded airbag 4 in the front-rear direction. That is, the front end portion, which is the tip of the restricting sheet 37, is in a position where it does not extend forward with respect to the airbag 4. A roll portion 39 is formed at the tip, that is, the free end portion, of the restricting sheet 37. That is, the roll portion 39 is formed by folding the tip of the restricting sheet 37 in a roll shape toward the base end portion. In the present embodiment, the roll portion 39 is composed of the entire other sheet member 37b of the restricting sheet 37 and a part of one sheet member 37a continuous with the other sheet member 37b. The roll portion 39 is roll-folded downward, that is, toward the end flap portion 32 of the holding sheet 23. That is, the roll portion 39 is rolled inward toward the central portion in the front-rear direction. In the illustrated example, the roll portion 39 is formed in an elliptical or oval shape that is long in the front-rear direction. In FIG. 1, for clarity of explanation, the roll portion 39 is shown enlarged in the vertical direction, but preferably, the roll portion 39 is flat so as not to protrude upward more than necessary.

[0032] Also, the restricting sheet 37 has a shape without a folding portion for the general portion other than the roll portion 39, that is, the base end portion side.

[0033] Furthermore, the folding shapes of the holding sheet 23 and the restricting sheet 37 are held by a sheet-like wrapping member 40. The wrapping member 40 is also called a packing or the like. The wrapping member 40 is formed of, for example, a base fabric or the like. The wrapping member 40 is a protective member that protects the restricting sheet 37 or the like against the edge portion of the cover body 6 or the like.

[0034] The wrapping member 40 may have an arbitrary shape as long as it can hold the folding shapes of the holding sheet 23 and the restricting sheet 37. In the present embodiment, the wrapping member 40 integrally has a wrapping member main body portion 42 and a covering portion 43 extending from the wrapping member main body portion 42. The wrapping member 40 has a strip shape having a lateral width approximately the same as that of the folded airbag 4.

[0035] The wrapping member main body portion 42 is located between the holding sheet main body portion 25 of the holding sheet 23 and the bottom portion of the case body 3. An opening portion that communicates with the mounting hole portion 16 and into which the inflater 5 is inserted, and a mounting hole located around the opening portion through which the mounting bolts of the retainer 14 are inserted are formed in the wrapping member main body portion 42. In the present embodiment, the wrapping member main body portion 42 is formed to have a front-rear width approximately half of the front-rear width of the folded airbag 4 or the front-rear width of the holding sheet main body portion 25 of the holding sheet 23, and is located on the front portion side at the lower portion of the airbag 4.

[0036] In the assembled state of the airbag device 1 or in the state of being stored in the case body 3 that holds the folding shape of the airbag 4, the covering portion 43 of the wrapping member 40 is overlapped from the front on the upper portion of the restricting sheet 37 that is overlapped on the upper portion of the holding sheet 23 above the airbag 4. Further, a holding opening 47 is formed on the tip end side of the covering portion 43, and the wrapping member 40 is held by the case body 3 by hooking at least any one of the hook portions 17 of the case body 3 in the holding opening 47.

[0037] And in the wrapping member 40, a planned breaking part, which is a weak part such as a perforation, is formed in, for example, the covering part 43. When the airbag 4 is deployed, it breaks along this planned breaking part, thereby releasing the restraint of the airbag 4, the holding sheet 23, and the restricting sheet 37, and is configured not to affect the deployment behavior of the airbag 4.

[0038] Next, the assembly procedure of the airbag device 1 will be described.

[0039] First, the retainer 14 is inserted into and attached to the airbag 4. Then, after the airbag 4 is folded into a flat plate shape by a predetermined folding device or manually, it is folded into the final shape forming the first folding part 20 and the second folding part 21. The holding sheet 23 to which the restricting sheet 37 is fixed and the wrapping member 40 are attached, housed in the case body 3, and the inflator 5 is attached to the retainer 14.

[0040] In this state, the base end side portions of the side flap portions 30, 31 of the holding sheet 23 overlap the left and right side portions of the folded airbag 4, and the base end side of the end flap portion 32 and the end flap portion 33 of the holding sheet 23, and the base end side of the covering part 43 of the wrapping member 40 overlap the upper and lower end portions. At the same time, the tip end side portions of the side flap portions 30, 31, the tip end side portion of the end flap portion 32, the restricting sheet 37, and the tip end side portion of the covering part 43 of the wrapping member 40 extend above the airbag 4.

[0041] Therefore, first, the tip ends of the side flaps 30 and 31 that extend upward from both the left and right sides of the folded airbag 4 in the holding sheet 23 are overlapped from the left and right on the upper part of the first folding part 20 of the folded airbag 4. Regarding the side flap parts 30 and 31, either one can be the leading one, but in this embodiment, for example, as shown in FIG. 4(a), the tip end side of the right side flap part 31 is folded back to the left and overlapped on the upper part of the airbag 4 from the right side. Then, as shown in FIG. 4(b), the tip end side of the left side flap part 30 is folded back to the right and overlapped on the upper part of the airbag 4 from the left side. In this embodiment, since the sum of the left - right lengths of either one of the tip end sides of the side flap parts 30 and 31 that extend on the upper part of the airbag 4 is equal to or substantially equal to the left - right width of the folded airbag 4, the tip ends of the side flap parts 30 and 31 are in a position where they do not overlap or substantially do not overlap with each other. However, it is not limited to this, and the tip ends of the side flap parts 30 and 31 may overlap vertically with each other.

[0042] Next, as shown in FIG. 4(c), the tip end side of the end flap part 32 that extends upward from the front part of the airbag 4 in the holding sheet 23 is folded back to the rear and overlapped on the upper parts of the side flap parts 30 and 31 from the front. At this time, it is preferable to fold the tip end of the end flap part 32 toward the side flap parts 30 and 31, that is, downward, to form a folded part 35. In this state, the end flap part 32 is positioned in a range covering substantially the entire tip end sides of the side flap parts 30 and 31 within the front - rear, left - right widths of the folded airbag 4, and the folded part 35 is close to the rear edge part of the opening 10 of the case body 3.

[0043] After that, as shown in FIG. 4(d), the tip end of the regulating sheet 37 is folded into a roll shape to form a roll part 39, and the regulating sheet 37 is folded back forward and overlapped on the upper part of the end flap part 32 from the rear as shown in FIG. 4(e). In this state, the roll part 39 is in contact with the end flap part 32, and its front end part is along the front edge part of the opening 10 of the case body 3 and is in a position close to its front edge part, for example, within 10 mm from the front edge part of the opening 10 to the rear.

[0044] Then, the covering portion 43 of the wrapping member 40 is folded back rearward and overlapped from the front on the upper portion of the regulation sheet 37 as shown in FIG. 4(f). At the same time, the holding opening 47 formed at the tip of the wrapping member 40 is hooked on at least one of the hook portions 17, and the wrapping member 40 is held by the case body 3.

[0045] As a result, the airbag 4 is held by the case body 3 while the folded state is held by the holding sheet 23, the regulation sheet 37, and the wrapping member 40. As shown in FIG. 1, the joint portion 38 between the regulation sheet 37 and the holding sheet 23 is positioned so as to be sandwiched between the airbag 4 and the rear wall portion of the case body 3. A cover body 6 is attached to the case body 3 so as to cover the upper part of the airbag 4, that is, the opening 10.

[0046] The completed airbag device 1 is assembled at a predetermined installation position in the vehicle interior such as the instrument panel portion 2, and a control device or the like is electrically connected to the inflator 5.

[0047] Then, when it is detected that a large external force has been applied to the vehicle, for example, due to a collision, a signal is sent from the control device to the inflator 5, and the inflator 5 operates to inject gas into the airbag 4.

[0048] As the gas is introduced into the airbag 4, the first folded portion 20 (shown in FIG. 4(f)) into which the gas is directly introduced expands from the front side while the second folded portion 21 (shown in FIG. 4(f)) is pushed upward. Subsequently, gas is introduced into the second folded portion 21 (shown in FIG. 4(f)), and the second folded portion 21 (shown in FIG. 4(f)) starts to expand. Due to the expansion of the airbag 4, the side flap portions 30, 31 of the holding sheet 23 overlapping the airbag 4 are pushed upward, and the end flap portion 32 overlapping the side flap portions 30, 31 is pushed upward from the front side. At this time, the folded portion 35 formed at the rear end portion, which is the tip of the end flap portion 32, gives a trigger to push up the regulation sheet 37 overlapping the upper portion of the end flap portion 32.

[0049] When the end flap portion 32 is pushed up so that the folding portion 35 faces the upper front, the restricting sheet 37 overlapping the upper portion of the end flap portion 32 is pushed up. Therefore, for the restricting sheet 37, the roll portion 39 formed at the front end, which is the tip portion, is pushed up so as to face the upper rear.

[0050] In this way, due to the inflation pressure of the airbag 4, the holding sheet 23 and the restricting sheet 37 are deployed, while the wrapping member 40 cracks from the planned fracture portion, and the cover body 6 breaks from the tear line 18, opening a protruding port in the instrument panel portion 2.

[0051] Therefore, as the airbag 4 protruding upward from the protruding port expands, the roll of the roll portion 39 unwinds along the windshield 11 while the restricting sheet 37 rotates upward to the rear. As shown in FIG. 5, the restricting sheet 37 covers the head H of the occupant A and crosses over the top of the head, with the restricting sheet 37 intervening between the head H of the occupant A. In other words, the airbag 4 rapidly expands and deploys in a state where the restricting sheet 37 acts as a wall against the airbag 4, restraining and protecting the occupant A. Note that FIG. 5 shows an example in which the occupant A is a 6-year-old child (6YO) dummy.

[0052] As described above, the side flap portions 30 and 31 of the holding sheet 23 for holding the folded shape of the airbag 4 are overlapped from the left and right with respect to the folded airbag 4, respectively, and the end flap portion 32 of the holding sheet 23 is overlapped from the front with respect to the side flap portions 30 and 31. At the same time, a restricting sheet 37 for restricting the deployment of the airbag 4 is overlapped from the rear with respect to the end flap portion 32 of the holding sheet 23, and a roll portion 39 is formed at the tip portion located on the front side. Therefore, while restricting the bias of the input in the left-right direction of the airbag 4 by the side flap portions 30 and 31, the restricting sheet 37 is pushed up by the end flap portion 32, and the roll portion 39 follows along the front glass 11 from the airbag 4, so that the restricting sheet 37 can be stably deployed, and the restricting sheet 37 and the airbag 4 are deployed so as to be in surface contact with the occupant A. Therefore, for example, even if the occupant A is in an unsteady seating state (so-called out-of-position (OOP) state) close to the instrument panel portion 2, the airbag 4 and the restricting sheet 37 do not enter the area under the occupant A's chin and lift the head H, but can suppress the backward tilt of the head H and stably protect the occupant A.

[0053] In particular, when the front end portion of the roll portion 39 is located, for example, within 10 mm behind the front edge portion of the opening portion 10 of the case body 3, the restricting sheet 37 can be surely and stably deployed.

[0054] Since the restricting sheet 37 is fixed to the holding sheet 23 at a rear position with respect to the folded airbag 4, the deployment behavior in which the roll portion 39 at the front end portion of the restricting sheet 37 unfolds upward to the rear can be surely obtained starting from this fixed position (joint portion 38).

[0055] Since the roll portion 39 is roll-folded toward the end flap portion 32, the roll of the roll portion 39 will be unwound along the front glass 11 when the restricting sheet 37 is deployed, and the restricting sheet 37 can be deployed more stably.

[0056] In addition, since the regulation sheet 37 has no folding part in the general part excluding the roll part 39 at the overlapping part of the end flap part 32, there is no allowance for the space where the airbag 4 expands backward when the airbag 4 is deployed. Therefore, since the deployment of the airbag 4 toward the anti-occupant side, that is, the front side, is prioritized, the function as the regulation sheet 37 can be effectively exerted.

[0057] Since the folding part 35 folded toward the side flap parts 30 and 31 is formed at the tip part located on the rear side in the end flap part 32, the end flap part 32 can have the property of being a trigger for pushing up the roll part 39 of the regulation sheet 37, and the regulation sheet 37 can be deployed more stably.

[0058] And thus, even when the occupant A is in an unsteady seating state, it can be stably protected, so that, for example, the performance of Position 1 of Low Risk Deployment (LRD) with a 6YO dummy defined in the new North American regulations (FMVSS 208) can be achieved.

Industrial Applicability

[0059] The present invention is suitably used, for example, as an airbag device for a passenger seat.

Explanation of Signs

[0060] 1 Airbag device 3 Case body 4 Airbag 23 Holding sheet 30, 31 Side flap parts 32 End flap part 35 Folding part 37 Regulation sheet 39 Roll part A Occupant

Claims

1. A case body, an airbag housed in a folded state in this case body, a holding sheet for holding the folded shape of this airbag, and a regulating sheet for regulating the deployment of the airbag, and the holding sheet has side flap portions that are overlapped from the left and right as viewed from the occupant with respect to the airbag, and end flap portions that are overlapped from the non-occupant side with respect to these side flap portions, the regulating sheet is overlapped from the occupant side with respect to the end flap portion and has a roll portion at the tip portion located on the non-occupant side characterized airbag device.

2. The regulating sheet is fixed to the holding sheet at a position on the occupant side with respect to the folded airbag characterized airbag device according to claim 1.

3. The roll portion is roll-folded toward the end flap portion characterized airbag device according to claim 1 or 2.

4. The end flap portion has a folded portion that is folded toward the side flap portion at the tip portion located on the occupant side characterized airbag device according to claim 1 or 2.

Images