Airbag device

Abstract

To provide an airbag device capable of suppressing rotation of a head part.SOLUTION: The airbag device includes a front panel that constitutes a front side of the airbag, a rear panel that constitutes a back side of the airbag, and a pair of elongated tethers that are housed inside the airbag, wherein the pair of tether end portions are disposed so as to be alternately spaced apart from each other in a direction orthogonal to a deployment direction, and each tether is movably disposed via a relay member.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to an airbag device. [Background technology]

[0002] As a prior art, there is known an airbag device that combines a driver's airbag with a curtain airbag that protects the occupant's head in the event of a side collision, and that is capable of protecting the occupant by inflating and deploying both the driver's airbag and the curtain airbag in the event of a frontal collision or a diagonal frontal collision (see, for example, Patent Document 1).

[0003] Furthermore, as prior art, an airbag device has been disclosed that has a front panel, which is the front surface facing the occupant, and a rear panel, which is the rear surface on the opposite side, and an insertion portion for a string-like tether is provided in the rear panel, one end of the tether is connected to the upper part of the front panel and the other end is connected to the lower part of the front panel, the middle of the tether is inserted into the insertion portion so that it can move in the vertical direction, an inflator that inflates the airbag is disposed on the rear panel side, and the tether regulates the shape of the airbag when it inflates (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-037159 [Patent Document 2] Japanese Patent Application Laid-Open No. 2002-200953 Summary of the Invention [Problem to be solved by the invention]

[0005] As shown in Figures 1 and 2, when a vehicle experiences a diagonal front collision, the curved surface of the front panel 2 of the airbag 1 inflates forward (toward the interior of the vehicle). The occupant also tends to move inertially toward the diagonal front and outward of the vehicle. Figure 1 shows the front panel 2 inflated toward the front. Figure 2 also shows the head 3 inertially moving toward the diagonal front and outward of the vehicle, indicated by a dashed line.

[0006] The head 3, which moves diagonally forward and outward due to inertia, hits the curved surface of the front panel 2, which bulges outward, causing the head 3 to rotate. The direction of rotation of the head 3 is indicated by an arrow in Figure 2. There is a possibility that the head 3 may rotate.

[0007] The above-mentioned Patent Document 2 describes that when the airbag inflates, the tether moves upward, thereby reducing the inflation of the upper part of the airbag while restricting the inflation of the lower part of the airbag, and that when the tether moves downward, thereby restricting the inflation of the upper part of the airbag while reducing the inflation of the lower part of the airbag. However, the tether described in Patent Document 2 does not reduce or restrict the inflation of the airbag so as to suppress the rotation of the head during an oblique frontal collision of the vehicle.

[0008] In addition, in the airbag device described in Patent Document 1, the airbag for the driver's seat is similar to the airbag described in Patent Document 2.

[0009] An object of the present invention is to provide an airbag device that can suppress head rotation. [Means for solving the problem]

[0010] In order to achieve the above object, the airbag device of the present invention comprises: An airbag device for protecting an occupant by inflating the airbag toward the front side of the vehicle, which is the rear side of the vehicle, a front panel that forms the front side of the airbag; a rear panel that forms a rear side of the airbag; a pair of elongated tethers housed inside the airbag; Equipped with The pair of tether ends are arranged alternately and spaced apart from each other in a direction perpendicular to the deployment direction, and each tether is arranged movably via an intermediate member. [Effects of the Invention]

[0011] According to the present invention, it is possible to suppress rotation of the head. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a diagram showing an airbag in a comparative example, which is inflated toward the interior (front side) of the vehicle during a diagonal front collision. [Figure 2] FIG. 2 is a diagram showing the relationship between the airbag in a comparative example and the head that has inertially moved diagonally forward and outward from the vehicle. [Figure 3] FIG. 3 is a plan view of the airbag device according to the embodiment of the present invention. [Figure 4] FIG. 4 is a rear view of the airbag device according to the embodiment of the present invention. [Figure 5] FIG. 5 is a rear view showing a reinforcing fabric according to an embodiment of the present invention. [Figure 6] FIG. 6 is a rear view showing a pair of holding bands in the embodiment of the present invention. [Figure 7] FIG. 7 is a plan view of the airbag according to the embodiment of the present invention, showing the airbag inflated to the front side (inside the vehicle) during an oblique front collision of the vehicle. [Figure 8] FIG. 8 is a plan view of the airbag according to the embodiment of the present invention, showing the relationship between the airbag and the head that has inertially moved diagonally forward and outward from the vehicle. [Figure 9] FIG. 9 is a plan view of an airbag according to an embodiment of the present invention, showing a pair of tethers inside the airbag that are inflated to the front side (interior side of the vehicle) during an oblique front collision of the vehicle. [Figure 10]FIG. 10 is a plan view of the airbag according to the embodiment of the present invention, showing a schematic relationship between a pair of tethers in the airbag and the head that has inertially moved diagonally forward and outward from the vehicle. [Figure 11] FIG. 11 is a plan view showing a schematic relationship between the inertial force acting on the head and the force acting on the airbag during a diagonal front collision of the vehicle. [Figure 12] FIG. 12 is a diagram showing the relationship between the horizontal rotation angular velocity of the head and the passage of time when the head hits the airbag during a diagonal front collision of the vehicle. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 3 is a plan view of an airbag device according to an embodiment of the present invention. Fig. 3 depicts a BL axis, a TL axis, and a WL axis. In Fig. 3, the left-right direction is referred to as the vehicle width direction or BL direction, the right direction is referred to as one side in the vehicle width direction or "+BL direction," and the left direction is referred to as the other side in the vehicle width direction or "-BL direction." The up-down direction is referred to as the vehicle front-rear direction, the down direction is referred to as the front side, vehicle rear side, vehicle rear direction, or "+TL direction," and the up direction is referred to as the back side, vehicle front side, vehicle front direction, or "-TL direction." The depth direction is referred to as the vehicle height direction or WL direction, the front side is referred to as the upper side in the vehicle height direction or "+WL direction," and the back side is referred to as the lower side in the vehicle height direction or "-WL direction."

[0014] The airbag device 100 according to the embodiment of the present invention suppresses the rotation of the occupant's head during a diagonal front collision of the vehicle. Here, "diagonally forward of the vehicle" in this embodiment refers to a direction inclined diagonally to the other side in the vehicle width direction (-BL direction) relative to the front side of the vehicle (-TL direction). Also, "diagonal front collision of the vehicle" refers to, for example, a collision of the vehicle with an obstacle from a direction inclined to the other side in the vehicle width direction relative to the front side of the vehicle (see FIG. 3).

[0015] The airbag device 100 according to the embodiment of the present invention includes an airbag 10, a pair of tethers 50, a reinforcing fabric 60, and a pair of retaining bands .

[0016] The airbag 10 has a front panel 20 that forms the front side of the airbag 10, and a rear panel 30 that forms the rear side of the airbag 10. The front panel 20 and the rear panel 30 are each made of a substantially circular piece of cloth or the like. The peripheral edge of the front panel 20 and the peripheral edge of the rear panel 30 are joined to each other by sewing, thereby forming an outer periphery 10a of the airbag 10. In Figure 3, the outer periphery 10a is indicated by a dashed line.

[0017] The airbag 10 is disposed in the vehicle so that the front panel 20 faces the seat side (rear side of the vehicle, +TL direction) and the rear panel 30 faces the opposite side of the seat side. This causes the front panel 20 to face the occupant. The front side (+TL direction) shown in Fig. 3 is the seat side, and the back side (-TL direction) is the opposite side of the seat side.

[0018] 4 is a rear view of the airbag device according to the embodiment of the present invention. An opening (not shown) is provided in the central portion 31 of the rear panel 30. An inflator 80 is connected to the central portion 31 of the rear panel 30. The airbag 10 is inflated by introducing gas from the inflator 80 into the airbag 10 through the opening.

[0019] (reinforcing fabric 60, relay member) As shown in Figure 4, a reinforcing cloth 60 is arranged in the central portion 31 of the rear panel 30 along the inner surface of the rear panel 30. The reinforcing cloth 60 has an opening 64 of approximately the same diameter as the opening opened in the central portion of the rear panel 30, and is arranged so that the positions of the opening 64 (see Figure 5) and the opening coincide in the vehicle fore-and-aft direction (TL direction). The reinforcing cloth 60 and the rear panel 30 are joined to each other by sewing. The reinforcing cloth 60 corresponds to the "relay member" in this invention.

[0020] Fig. 5 is a rear view showing a reinforcing fabric in an embodiment of the present invention. Reinforcing fabric 60 has a circular fabric portion 61 having a substantially circular outer shape and two tongue-like fabric portions 62a, 62b having tongue-like outer shapes. When the outer circumferential direction of circular fabric portion 61 shown in Fig. 5 is taken as the clockwise direction, tongue-like fabric portion 62a is located at the 4 o'clock position on the outer shape of circular fabric portion 61 and protrudes from the 4 o'clock position toward one side in the vehicle width direction (+BL direction). Furthermore, tongue-like fabric portion 62b is located at the 10 o'clock position on the outer shape of circular fabric portion 61 and protrudes from the 10 o'clock position toward the other side in the vehicle width direction (-BL direction).

[0021] The tongue-shaped cloth portion 62a has a first insertion portion 63a through which a first tether 50a (described later) is inserted. Furthermore, the tongue-shaped cloth portion 62b has a second insertion portion 63b through which a second tether 50b (described later) is inserted. For example, the first insertion portion 63a is a slit formed by cutting the tongue-shaped cloth portion 62a in the vehicle height direction (WL direction). Furthermore, the second insertion portion 63b is a slit formed by cutting the tongue-shaped cloth portion 62b in the vehicle height direction (WL direction). Note that in FIG. 3, the first insertion portion 63a and the second insertion portion 63b are indicated by circular dashed lines. Furthermore, in FIG. 4, the first insertion portion 63a and the second insertion portion 63b are indicated by rectangular dashed lines.

[0022] (Pair of retaining bands 70) Fig. 6 is a rear view showing a retaining band in an embodiment of the present invention. As shown in Fig. 3, a pair of retaining bands 70 are arranged along the inner surface of the front panel 20. Also, as shown in Fig. 6, the pair of retaining bands 70 are arranged so as to overlap each other in the vehicle fore-and-aft direction (TL direction). In the following description, the retaining band 70 arranged on the rear side (-TL direction) will be referred to as the first retaining band 70a, and the retaining band 70 arranged on the front side (+TL direction) will be referred to as the second retaining band 70b.

[0023] The first retaining band 70a and the second retaining band 70b are each molded from, for example, a resin material that has flexibility, durability, and a certain level of tensile strength, and have the same shape. The first retaining band 70a is for joining the first tether 50a to the front panel 20. The second retaining band 70b is for joining the second tether 50b to the front panel 20. In the following explanation, the first retaining band 70a will be mainly described, and as for the second retaining band 70b, configurations that differ from the first retaining band 70a will be described; configurations that are the same as those of the first retaining band 70a will be assigned the same reference numerals and their description will be omitted.

[0024] The first retaining band 70a includes a circular band portion 71a having a substantially circular outer shape and a tongue-shaped band portion 72a having a tongue-shaped outer shape. When the outer circumferential direction of the circular band portion 71a shown in Fig. 6 is the clockwise direction, the tongue-shaped band portion 72a is located at the 4 o'clock position on the outer shape of the circular band portion 71a and extends from the 4 o'clock position to one side in the vehicle width direction (+BL direction).

[0025] Similar to the first retaining band 70a, the second retaining band 70b includes a circular band portion 71b and a tongue-shaped band portion 72b. When the outer circumferential direction of the circular band portion 71b shown in Fig. 6 is the clockwise direction, the tongue-shaped band portion 72b is positioned at the 10 o'clock position on the outer shape of the circular band portion 71b and extends from the 10 o'clock position to the other side in the vehicle width direction (-BL direction).

[0026] The circular band portion 71a of the first retaining band 70a, the circular band portion 71b of the second retaining band 70b, and the central portion 21 of the front panel 20 are joined by being sewn together. In Figure 6, the stitching points where the three are sewn together are shown by dashed lines.

[0027] (Pair of tethers 50) As shown in Figures 3 and 4, each of the pair of tethers 50 is disposed inside the airbag 10. The tether 50 has an elongated shape. The tether 50 controls the inflated shape and inflation trajectory of the airbag 10. The tether 50 is molded from, for example, a resin material that has flexibility, durability, abrasion resistance, and a certain level of tensile strength or more.

[0028] The pair of tethers 50 are arranged alternately and spaced apart from each other. In the following description, one of the pair of tethers 50 is referred to as a first tether 50a, and the other of the pair of tethers 50 is referred to as a second tether 50b.

[0029] The first tether 50a extends from a position on one side of the central portion 21 of the front panel 20 in the vehicle width direction (+BL direction) where it is connected to the front panel 20, via a reinforcing cloth 60 (relay member), to a position on the other side of the outer periphery 10a in the vehicle width direction (-BL direction) where it is connected to the outer periphery 10a.

[0030] Specifically, one longitudinal end of the first tether 50a is coupled to the tongue-shaped band portion 72a located to one side in the vehicle width direction (+BL direction) of the central portion 21 of the front panel 20. As a result, one end of the first tether 50a is coupled to the central portion 21 of the front panel 20 via the first retaining band 70a (circular band portion 71a, tongue-shaped band portion 72a; see Figures 3, 4, and 6).

[0031] An intermediate portion in the longitudinal direction of the first tether 50a is inserted into the first insertion portion 63a of the reinforcing cloth 60. The other end portion in the longitudinal direction of the first tether 50a is joined to the outer circumferential portion 10a at a position on the other side in the vehicle width direction (-BL direction) of the outer circumferential portion 10a. One end portion of the first tether 50a located on one side in the vehicle width direction (+BL direction) and the other end portion located on the other side in the vehicle width direction (-BL direction) are connected to the rear panel 30 via the reinforcing cloth 60 because the reinforcing cloth 60 and the rear panel 30 are joined to each other as described above.

[0032] The second tether 50b extends from a position on the other side of the vehicle width direction (-BL direction) of the central portion 21 of the front panel 20 where it is joined to the front panel 20, via a reinforcing cloth 60 (relay member), to a position on one side of the outer periphery 10a in the vehicle width direction (+BL direction) where it is joined to the outer periphery 10a.

[0033] Specifically, one longitudinal end of the second tether 50b is coupled to the tongue-shaped band portion 72b located on the other side in the vehicle width direction (-BL direction) of the central portion 21 of the front panel 20. As a result, one end of the second tether 50b is coupled to the central portion 21 of the front panel 20 via the second retaining band 70b (circular band portion 71b, tongue-shaped band portion 72b; see Figures 3, 4, and 6).

[0034] An intermediate portion in the longitudinal direction of the second tether 50b is inserted into the second insertion portion 63b of the reinforcing cloth 60. The other longitudinal end portion of the second tether 50b is joined to the outer circumferential portion 10a at a position on one side in the vehicle width direction (+BL direction) of the outer circumferential portion 10a. The one end portion of the second tether 50b located on the other side in the vehicle width direction (-BL direction) and the other end portion located on the one side in the vehicle width direction (+BL direction) are connected to the rear panel 30 via the reinforcing cloth 60 because the reinforcing cloth 60 and the rear panel 30 are joined to each other as described above.

[0035] (Operation of the airbag device 100) Next, the operation of the airbag device 100 in a diagonal front collision of the vehicle will be described with reference to FIGS. 7, 8, 9, and 10. FIG. 7 is a plan view of an airbag according to an embodiment of the present invention, showing the airbag inflated toward the front side (inner side) of the vehicle in a diagonal front collision of the vehicle. FIG. 8 is a plan view of an airbag according to an embodiment of the present invention, showing the relationship between the airbag and a head that has inertially moved diagonally forward and outward of the vehicle. FIG. 9 is a plan view of an airbag according to an embodiment of the present invention, showing a pair of tethers inside the airbag inflated toward the inner side (front side) of the vehicle in a diagonal front collision of the vehicle. FIG. 10 is a plan view of an airbag according to an embodiment of the present invention, showing a pair of tethers inside the airbag and a head that has inertially moved diagonally forward and outward of the vehicle. FIG. 11 is a plan view showing a relationship between the inertial force acting on the head and the force received by the airbag in a diagonal front collision of the vehicle.

[0036] In Figure 8, the head 3 is shown by a dashed line as it inertially moves diagonally forward and outward from the vehicle. The direction of airbag deformation is also shown by an arrow in Figure 8. In Figures 9 and 10, the direction of head 3 movement is shown by a solid arrow. Also, Figures 9 and 10 show the curtain airbag CAB deployed during a collision. Also, in Figures 9, 10, and 11, the positions of the first insertion portion 63a and the second insertion portion 63b are shown by black circles. Also, in Figures 10 and 11, the direction of movement of each of the pair of tethers 50 is shown by a dashed arrow.

[0037] In the following description, a "vehicle oblique front collision" will be described as a collision in which the vehicle collides with an obstacle from a direction inclined toward the other vehicle width direction (-BL direction) relative to the front of the vehicle (-TL direction). The area on one side of the center 21 of the front panel 20 in the vehicle width direction (+BL direction) will be referred to as "area A." The area on the other side of the center 21 of the front panel 20 in the vehicle width direction (-BL direction) will be referred to as "area B."

[0038] In the event of a diagonal frontal collision of the vehicle, gas is introduced into the airbag 10 from the inflator 80, causing the airbag 10 to inflate. Also, the first tether 50a and the second tether 50b are each expanded from their folded state within the airbag 10. This restricts the shape of the airbag 10 when it inflates, and the curved surface of the front panel 20 bulges out toward the front side (+TL direction) as shown in FIGS. 7 and 9.

[0039] Furthermore, during a diagonal front collision, the head 3 inertially moves diagonally forward and outward from the vehicle. As the head 3 inertially moves diagonally forward and outward from the vehicle, the head 3 abuts against the curved surface of the front panel 20, causing the region B to become indented. As a result, as shown in FIG. 10 , one end of the first tether 50a moves toward the rear side (-TL direction) and toward one side in the vehicle width direction (+BL direction), changing from an elongated state to a slack state. Since the middle portion of the first tether 50a moves toward one side in the vehicle width direction (+BL direction) at the position of the first insertion portion 63a by the amount that one end of the first tether 50a becomes slack, the other end of the first tether 50a further elongates toward the front side (+TL direction). Furthermore, one end of the second tether 50b moves toward the rear side (-TL direction) and changes from an elongated state to a slack state. As one end of the second tether 50b becomes loose, the middle portion of the second tether 50b moves to one side in the vehicle width direction (+BL direction) at the position of the second insertion portion 63b, and the other end of the second tether 50b extends further to one side in the vehicle width direction (+BL direction) relative to the front side.

[0040] 11, region B of airbag 10 is recessed toward the rear side due to an inertial force acting on head 3 diagonally forward and outward of the vehicle. Airbag 10 is subjected to a force represented by vector p3, which is a resultant force of a force represented by vector p1 directed in the direction in which second tether 50b extends and a force represented by vector p2 directed in the direction in which first tether 50a extends. When airbag 10 is subjected to the force represented by vector p3, region A of airbag 10 bulges forward and toward one side in the vehicle width direction. The bulging of region A forward and toward one side in the vehicle width direction makes it possible to suppress rotation of head 3 that tends to rotate toward one side in the vehicle width direction.

[0041] The gas inside the airbag 10 moves in parallel with the depression of the region B and the expansion of the region A. In Fig. 8, the direction in which the gas inside the airbag 10 moves is indicated by arrows.

[0042] Next, the relationship between the horizontal rotation angular velocity of the head 3 and the passage of time when the head 3 hits the airbag during a diagonal front collision of the vehicle will be described with reference to Fig. 12. Fig. 12 is a diagram showing the relationship between the horizontal rotation angular velocity of the head and the passage of time when the head hits the airbag during a diagonal front collision of the vehicle. The horizontal axis of Fig. 12 represents the elapsed time (ms) from the time of collision, and the vertical axis represents the horizontal rotation angular velocity (rad / s). In Fig. 12, the dashed line shows the relationship between the two when a conventional airbag device is used, and the solid line shows the relationship between the two when airbag device 100 of this embodiment is used.

[0043] As shown in FIG. 12, in a conventional airbag device, for example, after a diagonal front collision of a vehicle, the horizontal rotation speed increases from 0 (rad / s) to α (rad / s) in t (sec). As a result, the horizontal rotation angular acceleration is α / t (rad / s 2 In contrast to this, in the airbag device 100 of this embodiment, for example, after a diagonal front collision of the vehicle, the horizontal rotation speed increases from 0 (rad / s) to about α / 3 (rad / s) in t (sec). As a result, the horizontal rotation angular acceleration becomes about α / 3t (rad / s 2 )

[0044] That is, in the airbag device 100 of this embodiment, the horizontal rotation angular velocity is about 1 / 3 of that of the conventional airbag device. Also, the horizontal rotation angular acceleration is about 1 / 3. As a result, the airbag device 100 of this embodiment can suppress the rotation of the head 3 more effectively than the conventional airbag device.

[0045] The airbag device 100 in the above embodiment is an airbag device for protecting an occupant by inflating the airbag 10 toward the front side, which is the interior of the vehicle, and includes a front panel 20 that forms the front side of the airbag 10, a rear panel 30 that forms the rear side of the airbag 10, an outer periphery 10a where the peripheral edge of the front panel 20 and the peripheral edge of the rear panel are joined to each other, and a pair of long tethers 50 housed inside the airbag 10, with ends of the pair of tethers 50 arranged alternately and spaced apart from each other in a direction perpendicular to the deployment direction, and each tether arranged movably via a relay member. By arranging the pair of tethers 50 at positions spaced apart from each other, it is possible to limit the inflation of the airbag, thereby making it possible to suppress rotation of the head 3.

[0046] Moreover, the airbag device 100 in the above embodiment further includes a reinforcing cloth 60 (relay member) arranged on the back side of the airbag 10, and the first tether 50a, which is one of the pair of tethers 50, extends from a position on one side of the central portion 21 of the front panel 20 in the vehicle width direction where it is joined to the front panel 20, via the reinforcing cloth 60 (relay member), to a position on the other side of the outer periphery 10a in the vehicle width direction where it is joined to the outer periphery 10a, and the second tether 50b, which is the other of the pair of tethers 50, extends from a position on the other side of the central portion 21 of the front panel 20 in the vehicle width direction where it is joined to the front panel 20, via the reinforcing cloth 60 (relay member), to a position on one side of the outer periphery 10a in the vehicle width direction where it is joined to the outer periphery 10a.

[0047] With the above configuration, in the event of a diagonal front collision, when the head 3 inertially moves diagonally forward and outward from the vehicle and abuts against the curved surface of the front panel 20, one end of the first tether 50a moves toward the rear side (-TL direction) and toward one side in the vehicle width direction (+BL direction), changing from a stretched state to a slack state. Since the middle portion of the first tether 50a moves toward one side in the vehicle width direction (+BL direction) at the position of the first insertion portion 63a by the amount that one end of the first tether 50a slackens, the other end of the first tether 50a further stretches toward the front side (+TL direction). Furthermore, one end of the second tether 50b moves toward the rear side and changes from a stretched state to a slack state. Since the middle portion of second tether 50b moves toward one side in the vehicle width direction at the position of second insertion portion 63b by the amount that one end of second tether 50b is loosened, the other end of second tether 50b is further extended toward one side in the vehicle width direction relative to the front side. As a result, area B, which is the area on the other side in the vehicle width direction of front panel 20, is recessed toward the back side, and area A, which is the area on one side in the vehicle width direction of front panel 20, bulges toward the front side and also bulges toward one side in the vehicle width direction, making it possible to suppress rotation of head 3 that tends to rotate toward one side in the vehicle width direction.

[0048] In the airbag device 100 according to the above embodiment, the reinforcing cloth 60 has a first insertion portion 63a through which the first tether 50a is inserted and a second insertion portion 63b through which the second tether 50b is inserted. This allows the first tether 50a and the second tether 50b to be movably connected to the back side of the airbag 10 via the reinforcing cloth 60.

[0049] The airbag device 100 in the above embodiment further includes a pair of retaining bands 70, with the first tether 50a being connected to the front panel 20 via the first retaining band 70a, which is one of the pair of retaining bands 70, and the second tether 50b being connected to the front panel 20 via the second retaining band 70b, which is the other of the pair of retaining bands 70, with the first retaining band 70a being positioned closer to the front or rear than the second retaining band 70b. This makes it possible to connect the first tether 50a and the second tether 50b to the front panel 20 via the pair of retaining bands 70.

[0050] In this embodiment, the airbag device 100 has been described as protecting the head 3 of the occupant in the event of a diagonal front collision of the vehicle. However, it goes without saying that the airbag device 100 protects the head 3 of the occupant in the event of a head-on collision in the same manner as a conventional airbag device.

[0051] In this embodiment, the relay member is the reinforcing fabric 60 arranged along the inner surface of the rear panel 30, but the present invention is not limited to this, and the relay member may be arranged on the rear side of the airbag 10. In this case, for example, the relay member may be the rear panel 30 itself, or may be a member other than the reinforcing fabric 60.

[0052] In addition, in the present embodiment, the first insertion portion 63a and the second insertion portion 63b are slits, but the present invention is not limited to this. For example, the first insertion portion 63a etc. may be rings formed by molding a resin or metal wire into an annular shape. In this case, the rings are attached to the rear panel 30 via the reinforcing cloth 60 or a member other than the reinforcing cloth 60.

[0053] Furthermore, the above-described embodiments are merely examples of specific embodiments for carrying out the present invention, and the technical scope of the present invention should not be construed as being limited by these embodiments. In other words, the present invention can be carried out in various forms without departing from the gist or main features thereof. [Industrial Applicability]

[0054] The present invention is suitably used in vehicles equipped with an airbag device that is required to suppress head rotation. [Explanation of symbols]

[0055] 1 airbag 2 Front Panel 3 head 10 Airbags 10a Outer periphery 20 Front Panel 21 Central part 30 Rear Panel 31 Central part 32 Aperture 50 Tether 50a First Tether 50b Second Tether 60 Reinforcement fabric 61 Circular cloth part 62a Tongue-like cloth part 62b Tongue-like cloth part 63a First insertion part 63b Second insertion part 64 Aperture 70 Retention Belt 70a First holding zone 70b Second holding zone 71a Circular belt 71b Circular belt 72a Lingual band 72b Lingual band 80 Inflator 100 Airbag device

Claims

1. An airbag device for protecting an occupant by inflating the airbag toward the front side of the vehicle, which is the rear side of the vehicle, a front panel that forms the front side of the airbag; a rear panel that forms a rear side of the airbag; a pair of elongated tethers housed inside the airbag; Equipped with The pair of tether ends are arranged alternately and spaced apart from each other in a direction perpendicular to the deployment direction, and each tether is arranged movably via an intermediate member. Airbag device.

2. Each of the tethers has at least one end located on the front panel; The airbag device according to claim 1 , wherein the relay member is disposed on the rear panel.

3. a first tether, which is one of the pair of tethers, having one end provided at a position on one side of the center of the front panel in the vehicle width direction, and extending to and coupled to an outer periphery of the airbag on the other side in the vehicle width direction; a second tether, which is the other of the pair of tethers, having one end provided at a position on the other side of the center of the front panel in the vehicle width direction, and extending to and coupled to an outer periphery of the airbag on one side in the vehicle width direction; The airbag device according to claim 1 , wherein the relay member includes an insertion portion through which the first tether and the second tether are inserted and movably held.

Images