JP6962283B2 - Passenger seat airbag device - Google Patents

Description

The present invention relates to an airbag device for a passenger seat, which includes an airbag that is folded and stored in a storage portion in front of the passenger seat.

Conventionally, the passenger seat airbag device has an airbag in which the rear side at the time of completion of expansion is an occupant protection portion, and this occupant protection portion dents substantially the center of the left and right sides at the time of completion of expansion to the front side. In some cases, the left and right ends are provided with irregularities so as to project relatively rearward (see, for example, Patent Document 1). In this conventional passenger seat airbag device, a central expansion portion that protrudes further rearward than the protrusion is formed on the left end side of the occupant protection portion, and the rear surface of the central expansion portion is formed on the protruding portion. It was formed so as to gently project rearward from the top of the vehicle, and was configured to protect the head of an occupant who moves diagonally forward in the event of an oblique collision or an offset collision of a vehicle.

JP-A-2016-2015

However, in the conventional passenger seat airbag device, the unevenness in the occupant protection portion is slight, and the central expansion portion that protects the occupant's head moving diagonally forward is larger than the top of the protrusion. Since it is formed in the region on the left side, for example, the head of the occupant moving diagonally forward to the left shifts to the right and is on the right side of the rear surface of the central expansion portion (recessed portion). When it comes into contact with the area between the tip of the dent and the top of the protrusion), it comes into contact with the occupant's head over a wide area including the right front side of the head. Since the head rotates so as to turn the head to the right side opposite to the traveling direction, there is a risk that the head of the occupant cannot be properly protected.

The present invention solves the above-mentioned problems, and stabilizes the occupant's head even if the occupant's head moving diagonally forward is received at a position shifted in the left-right direction. It is an object of the present invention to provide a protective passenger seat airbag device.

The passenger seat airbag device according to the present invention includes an airbag that is folded and stored in a storage portion in front of the passenger seat.
The airbag is shaped like a bag made of a flexible sheet body, and the shape at the time of completion of expansion is a substantially quadrangular pyramid shape with the top arranged on the front end side, and the front end side at the time of completion of expansion is used as the storage part. An airbag device for the passenger seat that is attached and is configured as an occupant protection unit that can protect the occupants on the rear side when expansion is completed.
The occupant protection department
When the expansion of the airbag is completed, the central recess that is recessed forward in the substantially center in the left-right direction and the protrusion that protrudes relatively rearward on both the left and right sides of the center recess are substantially aligned in the vertical direction, respectively. In this way, it is configured to be arranged over almost the entire upper and lower parts, and
At least one of the left and right sides of the central recess, in the area between the tip of the recess in the central recess and the top of the protrusion, toward the front diagonally during an oblique or offset collision of the vehicle. It is configured to arrange a restraint recess for allowing the head of a moving occupant to enter and restrain it.
The restraint recess is arranged so that the tip end side of the recess is connected to the front end side of the airbag by a tether arranged inside the airbag, and is recessed forward when the expansion of the airbag is completed. It is composed and
A protrusion arranged adjacent to the restraint recess is configured as an oblique protrusion that can catch the head of an occupant moving diagonally forward.
In the occupant protection portion, the central region, which is the region between the tip of the recess of the central recess and the tip of the recess of the restraint recess, is for restraint in the cross section substantially along the horizontal direction when the expansion of the airbag is completed. The end side portion on the concave side is set as a large curvature portion whose curvature is set to be larger than the curvature of the central side portion on the central concave side and the curvature of the region on the restraint concave side in the oblique protrusion. In addition to being configured, the large curvature portion is configured to be arranged on the restraint concave side rather than the left and right centers in the central region.

In the passenger seat airbag device of the present invention, the occupant protection portion, which is arranged on the rear side to protect the occupant when the expansion of the airbag is completed, has a central concave portion recessed to the front side at substantially the center of the left and right and a central concave portion. The protrusions that project relatively rearward on both the left and right sides are arranged so as to substantially follow each other in the vertical direction, and are at least one of the left or right side of the central concave portion and are in the center. In the region between the tip of the recess of the side recess and the top of the protrusion, a restraining recess that can be restrained by allowing the head of an occupant moving diagonally forward to enter is arranged. Then, in the passenger seat airbag device of the present invention, in the occupant protection portion, the central region, which is the region between the tip of the recess of the central recess and the tip of the recess of the restraint recess, completes the expansion of the airbag. In the cross section substantially along the horizontal direction at the time, the curvature of the end side portion that is the restraint recess side, the curvature of the central side portion that is the center side recess side, and the protrusion for oblique protrusion that is arranged adjacent to the restraint recess. It is configured as a large curvature portion whose curvature is set to be larger than the curvature of the region on the restraint concave side in the portion, and this large curvature portion is arranged on the restraint concave side rather than the left and right centers in the central region. It is configured to let you. That is, in the passenger seat airbag device of the present invention, when the expansion of the airbag is completed, the central region arranged on the central side so as to be continuous from the restraint recess increases the side adjacent to the restraint recess to the rear side. In addition to being raised, it bends sharply and connects to the concave side of the center side, and when the occupant's head moves toward the concave part for restraint diagonally forward in the event of a diagonal collision or offset collision of the vehicle, Even if the center side recess is slightly displaced toward the tip end side and comes into contact with the center side region, the region adjacent to the restraint recess, especially near the large curvature portion, is the front side of the occupant's head. It is possible to make contact only with the portion on the traveling direction side of the above. Therefore, it is possible to suppress the rotation of the occupant's head so as to turn the head toward the side opposite to the traveling direction, and the occupant's head can be smoothly entered into the restraint recess. As a result, the head of the occupant can be accurately protected by entering the restraint recess.

Therefore, in the passenger seat airbag device of the present invention, the occupant's head is stably protected even if the occupant's head moving diagonally forward is received at a position shifted in the left-right direction. can do.

Further, in the passenger seat airbag device of the present invention, the airbag faces the left wall portion and the right wall portion arranged substantially along the front-rear direction so as to face each other in the left-right direction side in the vertical direction side. The upper wall portion and the lower wall portion arranged substantially along the left-right direction, and the rear wall portion arranged substantially along the left-right direction so as to connect the upper wall portion and the lower wall portion on the occupant side. And, with the configuration
The tip of the recess on the central side constitutes the upper wall portion, the lower wall portion, and the rear wall portion, and the region from the upper wall portion to the lower wall portion via the rear wall portion is divided into two on the left-right direction side. As described above, it is composed of an inner connecting portion formed by connecting the inner edges of a pair of inner panels which are substantially symmetrical as a strip whose outer shape is curved in a substantially C shape.
The top of each protrusion is composed of an outer panel that constitutes the left or right wall, and an outer joint that connects the outer edges of the inner panel to each other.
It is preferable that the restraint recess is formed by providing a tack on the inner panel.

If the passenger seat airbag device has the above configuration, the central region of the occupant protection unit is composed of the inner panel, and the airbag can be easily manufactured by a flat joining operation. can.

Further, in the passenger seat airbag device having the above configuration, if the restraint recesses are arranged on the left and right sides of the central recess, when the occupant's head is moved diagonally forward to the left. Also, it is preferable because it can be protected even when moving diagonally forward to the right.

It is a perspective view of the state seen from the diagonally left front which shows the state in which the airbag used by the passenger seat airbag device which is one Embodiment of this invention is inflated by itself. It is a perspective view of the airbag of FIG. 1 as seen from the diagonally right rear view. It is a schematic vertical cross-sectional view of the airbag of FIG. 1, and is the cross-sectional view at the tip portion of the recess of the central side recess. It is a schematic vertical cross-sectional view of the airbag of FIG. 1, and is the cross-sectional view at the part of the concave part for restraint. It is a schematic cross-sectional view of the airbag of FIG. It is a top view which shows the base cloth which comprises the airbag of an embodiment. FIG. 5 is a schematic cross-sectional view showing a state in which the airbag has completed expansion in the passenger seat airbag device of the embodiment. It is a partially enlarged cross-sectional view which shows the expansion completion state of the airbag of an embodiment, and is the figure which shows the state before and after receiving the head of an occupant. It is a partially enlarged cross-sectional view which shows the expansion completion state of the airbag of the comparative example, and is the figure which shows the state which receives the head of an occupant. FIG. 5 is a schematic cross-sectional view showing a state in which an airbag, which is another embodiment of the present invention, has completed expansion.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 7, the passenger seat airbag device M (hereinafter, simply abbreviated as “airbag device”) of the embodiment is an passenger in a vehicle V which is a left-hand drive vehicle in which the passenger seat PS is arranged on the right side. It is arranged inside the instrument panel 1 in front of the seat PS. In the embodiment, the front-rear, up-down, and left-right directions coincide with the front-back, up-down, and left-right directions of the vehicle V unless otherwise specified.

As shown in FIG. 7, the airbag device M of the embodiment includes an airbag 15, an inflator 8 for supplying an expansion gas to the airbag 15, and a case as a storage portion for accommodating and holding the airbag 15 and the inflator 8. A retainer 9 for attaching the airbag 15 and the inflator 8 to the case 12 is provided. Further, although detailed illustration is omitted, the airbag device M is configured to include an airbag cover that covers the upper part of the folded airbag 15 and has a door portion that can be opened when the airbag 15 is expanded and expanded. Has been done. In the embodiment, the inflator 8 is configured to operate in the event of a frontal collision, an oblique collision, and an offset collision of the vehicle V.

As shown in FIGS. 1 to 5, the airbag 15 includes a bag body 16 that expands by inflowing expansion gas into the bag body 16 and a tether 45 that is arranged inside the bag body 16 and regulates the expansion completion shape of the bag body 16. , 47, 50, 55, and so on.

The bag body 16 has a bag shape formed from a flexible sheet body, and as shown in FIGS. 1 to 5, the expanded completed shape has a substantially quadrangular pyramid shape with the front end side as the top. The upper wall portion 16a and the lower wall portion 16b are arranged substantially along the left-right direction so as to face each other on the vertical direction side, and are arranged substantially along the front-rear direction so as to face each other on the left-right direction side. It includes a left wall portion 16c and a right wall portion 16d, and a rear wall portion 16e arranged substantially along the left-right direction so as to connect the upper wall portion 16a and the lower wall portion 16b on the occupant MP side. .. Further, the bag body 16 has an occupant protection unit 26 capable of protecting the occupant on the rear side when the expansion is completed, and is arranged between the instrument panel 1 and the windshield (not shown) on the front side of the occupant protection unit 26 when the expansion is completed. The vehicle body side portion 18 is provided. In the vehicle body side portion 18, at a position near the center in the left-right direction (near the front end of the lower wall portion) on the lower surface side on the front end 18a side when expansion is completed, an expansion gas is opened in a substantially circular shape so as to be able to flow into the inside. 20 and a plurality of (four in the case of the embodiment) mounting holes 21 for inserting bolts (not shown) of the retainer 9 are formed at the peripheral edge of the gas inlet 20. .. Further, vent holes 24, 24 for exhausting excess expansion gas that has flowed into the inside are formed on both left and right sides (left wall portion 18c and right wall portion 18d) of the vehicle body side portion 18.

In the airbag 15 when the expansion is completed, the occupant protection portion 26 has a central recess 27 that is recessed forward in substantially the center in the left-right direction and a protrusion 29L that projects relatively rearward on both the left and right sides of the central recess 27. It is configured to include 29R. As shown in FIGS. be. Specifically, in the airbag 15 of the embodiment, the recessed state of the central concave portion 27 and the raised state of the protruding portions 29L and 29R are different from the rear wall portion 16e to the upper wall when the expansion of the bag body 16 is completed. It is continuously formed so as to converge the unevenness toward the portion near the gas inflow port 20 while extending to the front side within the region of the portion 16a or the lower wall portion 16b. In the embodiment, the tip 27a of the recess 27 of the central recess 27 is composed of an inner joint portion 28 formed by connecting (sewing) the inner edges 65b and 72b of the inner left panel 65 and the inner right panel 72, which will be described later. The tops 29a of the protrusions 29L and 29R are formed by the inner left panel 65, the outer edges 65a and 72a of the inner right panel 72, and the outer edges 62a and 63a of the left side portion 62 and the right side portion 63 of the outer panel 60 described later. , Each is composed of outer joint portions 30L and 30R formed by joining (sewing), respectively. Further, in the airbag 15 of the embodiment, the occupant protection portion 26 is on the left side (driver's seat side) of the central side recess 27, and the tip 27a of the recess 27 on the central side and the top 29a of the protrusion 29L on the left side. A restraint recess 31 is arranged in a region between the two.

The restraint recess 31 is for entering and restraining the head MH of the occupant MP moving diagonally forward to the left at the time of an oblique collision or an offset collision of the vehicle V, and in the case of the embodiment, the restraint recess 31 is in the vertical direction. The length dimension L1 on the side is made smaller than the width dimension L2 on the vertical side of the portion of the rear wall portion 16e in the bag body 16 when the expansion is completed (see FIG. 4), and the rear wall portion 16e is from the vicinity of the upper end to the lower end. The bag body 16 at the time of completion of expansion is formed substantially along the vertical direction when viewed from the rear side so as to extend toward the side (see FIG. 2). As shown in FIGS. 4 and 5, the restraint recess 31 is configured to be recessed forward in a pocket shape by opening the rear end 31b side. In particular, the constraining recess 31, with opposed left and right direction, and a substantially rectangular shape of the left side wall 32 that is wider vertically when viewed from the lateral direction and the right side wall 33, and the left side wall 32 By connecting (sewing) the upper edge to each other, the lower edge to each other, and the leading edge to each other with the right side wall 33 , the rear end 31b side is opened in a substantially pocket shape (see FIG. 4). ). That is, the restraint recess 31 is configured so that the width dimension is substantially constant toward the front end 31a side (the tip end side of the recess). Specifically, the length dimension L1 on the vertical side of the restraint recess 31 is set to about 400 mm. Further, the restraint recess 31 is set so that the width dimension (depth) L3 on the front-rear direction side can enter the region on the front side of the head MH of the occupant MP, specifically, 50 to 100 mm. It is set to a degree (see FIG. 4). In the case of the embodiment, the restraint recess 31 has the tip (front end 31a) of the recess on the left side when the expansion of the airbag 15 is completed by the recess tether 50 and the auxiliary tether 55, which will be described later, arranged in the bag body 16. (Driver's seat side) It is configured to be arranged so as to be inclined in the front-rear direction so as to face forward (see FIG. 5). Further, in the embodiment, the connecting portion 34 that connects the front end 31a side of the restraint recess 31 to the recess tether 50 and the auxiliary tether 55 has the vertical width dimension of the trailing edge side as the vertical width dimension of the restraint recess 31. It is configured so as to match and gradually reduce the width dimension toward the front edge side, and the positions that are substantially centered on the top and bottom are connected to the recess tether 50 and the auxiliary tether 55. Even if the restraint recess 31 is widened vertically, the connecting portion 34 makes the restraint recess 31 substantially uniform up and down when the expansion of the airbag 15 is completed, and is moved diagonally forward to the left by the recess tether 50 and the auxiliary tether 55. It is shaped like this so that it can be towed toward it.

Further, in the airbag 15 of the embodiment, the protrusion 29L on the left side (driver's seat side) arranged adjacent to the restraint recess 31 can receive the head MH of the occupant MP moving diagonally forward. It is configured as a protrusion for oblique impact.

Then, in the airbag 15 of the embodiment, in the occupant protection portion 26, in the central side region 38 which is a region between the tip 27a of the recess of the central recess 27 and the tip of the recess (front end 31a) of the restraint recess 31. As shown in A of FIGS. It is configured as a large curvature portion 39a whose curvature is set to be larger than the curvature of the side portion 40 and the curvature of the right side region 29b on the restraint concave side of the oblique protrusion 29L. Then, as shown in A of FIG. 8, the large curvature portion 39a is closer to the restraint recess 31 side (left side, that is, operation) than the left and right centers (center line CL1 passing through the left and right centers) in the center side region 38. It is configured to be placed on the seat side). Specifically, in the cross section substantially along the horizontal direction when the expansion of the airbag 15 is completed, the large curvature portion 39a is set to about R30, and the tangent CL2 (left and right of the central portion 40) in contact with the central portion 40 is set. The tangent line that comes into contact with the substantially center of the direction) has an inclination angle θ with respect to the front-rear direction set to about 40 °. The shape of the central region 38 can be appropriately changed depending on the shape of the inner left panel 65, which will be described later, the length dimensions of the recessed tether 50 and the auxiliary tether 55, and the like.

As shown in FIGS. 3 to 5, tethers 45, 47, 50, and 55 are arranged in the bag body 16. Specifically, the left and right tethers 45 and 47, the recessed tether 50, and the auxiliary tether 55 are arranged in the bag body 16.

The left and right tethers 45 and 47 are arranged substantially along the left and right directions so as to connect the left wall portion 16c and the right wall portion 16d when the expansion of the bag body 16 is completed. As shown in 3 and 4, they are arranged at two places, upper and lower. In the case of the embodiment, the left and right tethers 45 and 47 are arranged in a strip shape substantially along the left and right directions so as to incline the width direction with respect to the horizontal direction when the expansion of the bag body 16 is completed (). (See FIGS. 3 and 4). As shown in FIGS. It is configured to be. These left and right tethers 45 and 47 are arranged to regulate the separation distance between the left wall portion 16c and the right wall portion 16d in the bag body 16 when the expansion is completed.

When the expansion of the airbag 15 is completed, the recessed tether 50 has the tip end side (front end 31a side) of the recess of the restraint recess 31 and the front end side (front end of the vehicle body side 18) of the bag body 16 as shown in FIG. It is arranged so as to connect with the 18a side), and is composed of the tether base cloth 51 shown in FIG. The tether base cloth 51 includes a strip-shaped main body portion 52 and a substantially circular connecting portion 53 formed so as to project to the right on the front end side of the main body portion 52. In this recessed tether 50, the connecting portion 53 on the front end 50a side is coupled (sewn) to the peripheral edge of the gas inflow port 20 and the rear end (rear end 50b) of the main body 52 extending from the left side of the gas inflow port 20. Is connected together with the right end 55b of the auxiliary tether 55 to the connecting portion 34 provided on the front end 31a side of the restraint recess 31. When the expansion of the airbag 15 is completed, the auxiliary tether 55 connects the right end 55b to the tip end side (front end 31a side) of the recess of the restraint recess 31 and connects the left end 55a to the left wall portion 16c, as shown in FIG. Therefore, the tip side (front end 31a side) of the recess of the restraint recess 31 and the left wall portion 16c are connected to each other. The recessed tether 50 and the auxiliary tether 55 each have a length dimension that cooperates with each other when the expansion of the airbag 15 is completed, and the restraint recess 31 is moved diagonally forward on the left side of the head MH of the occupant MP. The size is set so that it can be pulled forward while being inclined with respect to the front-rear direction so as to substantially follow the traveling direction of. Further, in the airbag 15 of the embodiment, by setting these recessed tethers 50 and auxiliary tethers 55 to predetermined lengths, the restraining recesses 31 move to the rear end 31b side when the expansion of the airbag 15 is completed. It is possible to suppress the arrangement by opening the mouth, and it is possible to maintain the raised state of the portion (end side portion 39) on the restraining recess 31 side in the central region 38.

The bag body 16 is formed in a bag shape by connecting the peripheral edges of a base cloth having a predetermined shape to each other, and in the case of the embodiment, mainly the left wall portion 16c and the right wall portion 16d are formed as shown in FIG. It is composed of an outer panel 60, and a pair of inner left panels 65 and inner right panels 72 that mainly form from the upper wall portion 16a to the lower wall portion 16b via the rear wall portion 16e.

In the case of the embodiment, the outer panel 60 has a substantially rectangular lower portion 61 forming a peripheral portion of the gas inflow port 20 in the vehicle body side portion 18 and a lower portion 61 having a symmetrical shape similar to the shape of an open butterfly. It includes a substantially elliptical left side portion 62 and a right side portion 63 which are arranged so as to extend from the side portion 61 on both the left and right sides. The lower portion 61 constitutes a region on the front side of the lower wall portion 16b. The left side portion 62 mainly constitutes the left wall portion 16c in the bag body 16 that has completed expansion. Specifically, in addition to the left wall portion 16c, the left side protruding portion 29L in the occupant protection portion 26 A region to the left of the top 29a of the (oblique protrusion) is also configured. The right side portion 63 mainly constitutes the right wall portion 16d in the bag body 16 that has completed expansion. Specifically, in addition to the right wall portion 16d, the right side protruding portion 29R in the occupant protection portion 26 The area to the right of the top 29a of the sack is also configured.

The inner left panel 65 and the inner right panel 72 mainly constitute an area from the upper wall portion 16a to the lower wall portion 16b via the rear wall portion 16e. The region between the tops 29a and 29a in the protrusions 29L and 29R of the above is formed. The inner left panel 65 and the inner right panel 72 are substantially symmetrical as a strip whose outer shape is curved in a substantially C shape so that this region is divided into two on the left-right direction side.

In the airbag 15 of the embodiment, the inner left panel 65 is divided into two front and rear portions, a front side portion 66 and a rear side portion 69, and each front side portion 66 and the rear side portion 69 each have a restraint recess 31. The recess forming portions 67 and 70 are provided. Then, the upper edges 67a and 70a of the recessed portions 67 and 70, the leading edges 67c and 70c, and the lower edges 67b and 70b are connected (sewn) to each other (restraint recess 31). The outer shape of the front side portion 66 and the rear side portion 69 (in the state after formation) is symmetrical with the inner right panel 72. Further, the inner left panel 65 and the inner right panel 72 are configured by substantially matching the shapes of the outer edges 65a and 72a with the shapes of the outer edges 62a and 63a of the left side portion 62 and the right side portion 63 of the outer panel 60, respectively. Has been done. That is, in the airbag 15 of the embodiment, the restraint recess 31 is formed so that the inner left panel 65 is provided with a surplus (recess forming portions 67, 70) and a tack is provided on the surplus. ..

In the embodiment, the outer panel 60 constituting the bag body 16, the inner left panel 65 (front side portion 66, rear side portion 69), the inner right panel 72, and the tether base cloths 46L, 46R constituting the left and right tethers 45, 47, The tether base cloth 51 and the auxiliary tether 55 constituting the 48L and 48R, the recessed tether 50, and the auxiliary tether 55 are each made of a flexible woven fabric made of polyester yarn, polyamide yarn, or the like.

Then, as shown in FIGS. 3 to 6, the bag body 16 of the embodiment has the corresponding edges of the outer panel 60, the inner left panel 65 (front side portion 66, rear side portion 69), and the inner right panel 72. It is made into a bag shape by sewing (bonding) with suture. Specifically, the recessed portions 67 and 70 formed in the front side portion 66 and the rear side portion 69 on the inner left panel 65 are formed by the upper edges 67a and 70a, the leading edges 67c and 70c, and the lower edges 67b and 70b. Each is connected to each other. The leading edge 61a of the lower portion 61 of the outer panel 60 is coupled to the inner left panel 65 and the leading edges 65c and 72c of the inner right panel 72, and the trailing edge 61b of the lower portion 61 is the inner left panel 65 and the inner side. It is coupled to the trailing edges 65d and 72d of the right panel 72. The outer edge 62a of the left side portion 62 in the outer panel 60 is coupled with the front left edge 61c, the rear left edge 61d, and the outer edge 65a of the inner left panel 65 of the lower portion 61, and the outer edge of the right side portion 63 in the outer panel 60. 63a is coupled to the front right edge 61e, the rear right edge 61f, and the outer edge 72a of the inner right panel 72 of the lower portion 61. The inner edge 65b of the inner left panel 65 is coupled to the inner edge 72b of the inner right panel 72.

In the airbag device M of this embodiment, the airbag 15 in which the retainer 9 is housed inside is folded so as to be housed in the case 12, and the periphery is wrapped with a breakable wrapping sheet (not shown). It is stored in the case 12, and the inflator 8 is connected to the case 12 together with the peripheral edge of the gas inlet 20 of the airbag 15 by using the retainer 9, and then the folded airbag 15 and the inflator 8 are stored and held. If the case 12 is connected to an airbag cover (not shown) formed on the instrument panel mounted on the vehicle V, the case 12 can be mounted on the vehicle V.

In the passenger seat airbag device M of the embodiment, the inflator 8 is activated at the time of a frontal collision, an oblique collision, or an offset collision of the vehicle V while being mounted on the vehicle V, and the airbag 15 is operated. The expansion gas is allowed to flow into the inside to expand, and the expansion is completed as shown in FIG. 7 while protruding from the case 12.

In the passenger seat airbag device M of the embodiment, the occupant protection unit 26, which is arranged on the rear side when the expansion of the airbag 15 is completed and protects the occupant MP, is recessed in the front side at substantially the center of the left and right sides. 27 and the protrusions 29L and 29R that project relatively rearward on both the left and right sides of the central recess 27 are arranged so as to substantially follow each other in the vertical direction, and the left side of the central recess 27. For restraint that can be restrained by allowing the head MH of the occupant MP, which moves diagonally forward, to enter the region between the tip 27a of the recess 27a of the central recess 27 and the top 29a of the protrusion 29L. The recess 31 is arranged. Further, in the passenger seat airbag device M of the embodiment, in the occupant protection portion 26, the center is the region between the tip 27a of the recess of the central recess 27 and the tip (front end 31a) of the recess of the restraint recess 31. In the cross section of the side region 38 substantially along the horizontal direction when the expansion of the airbag 15 is completed, the curvature of the end side portion 39 on the restraint recess 31 side, the curvature of the center side portion 40 on the center side recess 27 side, and , It is configured as a large curvature portion 39a whose curvature is set larger than the curvature of the region on the restraint concave side (right side region 29b) in the left protrusion 29L as the oblique protrusion, and this large curvature portion. The 39a is configured to be arranged closer to the restraint recess 31 than the left and right centers in the central region 38. That is, in the passenger seat airbag device M of the embodiment, when the expansion of the airbag 15 is completed, the central side region 38 arranged on the central side so as to be continuous with the restraint recess 31 is on the side adjacent to the restraint recess 31. Is greatly raised to the rear side and is sharply bent so as to be connected to the center side recess 27 side. When moving toward the 31 side, even if the center side recess 27 is slightly displaced toward the tip 27a side of the recess and comes into contact with the center region 38, the region adjacent to the restraint recess 31, especially The vicinity of the large curvature portion 39a can be brought into contact with only the portion on the front side of the head MH of the occupant MP in the traveling direction. Therefore, the head MH of the occupant MP can smoothly enter the restraint recess 31 by suppressing the occurrence of rotation toward the side opposite to the traveling direction and substantially along the horizontal direction. More specifically, in the passenger seat airbag device M of the embodiment, when the expansion of the airbag 15 is completed, the left region (end side) on the traveling direction side of the head MH of the occupant MP in the central region 38. Since the part 39) is greatly raised toward the rear side (occupant MP side), the head MH of the occupant MP moving diagonally forward to the left is on the left front side in the moving direction side from the center line CL3. Only the side region is brought into contact with the end side portion 39 (large curvature portion 39a) (see B in FIG. 8), and this contact causes the head MH of the occupant MP to be on the opposite side of the moving direction. It is possible to accurately suppress the occurrence of rotation that causes the vehicle to move to the right side, and the head MH of the occupant MP can be made to enter the restraint recess 31. As a result, in the passenger seat airbag device M of the embodiment, the head MH of the occupant MP can be accurately protected by entering the restraint recess 31.

Therefore, in the passenger seat airbag device M of the embodiment, even if the head MH of the occupant MP moving diagonally forward is received at a position shifted in the left-right direction, the head MH of the occupant MP Can be stably protected.

FIG. 9 shows the airbag 15'of the comparative example. In the airbag 15'of the comparative example, the central region 38'is simply raised in a substantially semicircular shape so as to be largely curved. It is configured in. Therefore, when the head MH of the occupant MP moving diagonally forward to the left comes into contact with the airbag 15'when the expansion is completed, the head MH has a large area and the front surface so as to straddle the center line CL3. Since the side is brought into contact with the central side region 38', it is unavoidable that the head MH of the occupant MP is subjected to a rotation R such that the head MH is directed to the right side opposite to the traveling direction.

Further, in the passenger seat airbag device M of the embodiment, in the case of a frontal collision of the vehicle V, the head MH of the occupant MP that moves forward is protected by entering the central recess 27. ..

Further, in the passenger seat airbag device M of the embodiment, the bag body 16 is composed of an outer panel 60, a pair of inner left panels 65, and an inner right panel 72, and is the tip of a recess in the central recess 27. 27a is composed of an inner connecting portion 28 formed by connecting the inner edges 65b and 72b of the inner left panel 65 and the inner right panel 72 to each other, and the top 29a in each of the protruding portions 29L and 29R is the outer panel 60, respectively. The outer edges 62a, 65a, 63a, 72a of the left side portion 62, the right portion 63, the inner left panel 65, and the inner right panel 72 are connected to each other, respectively. The restraining recess 31 is formed so as to provide a tack (recess forming portions 67, 70) on the inner left panel 65. That is, in the passenger seat airbag device M of the embodiment, since the central region 38 of the occupant protection unit 26 is composed of the inner left panel 65, the airbag 15 can be easily connected by a flat connecting operation. Can be manufactured. Further, in the passenger seat airbag device M of the embodiment, the inner left panel 65 and the inner right panel 72 are formed by connecting the inner edges 65b and 72b of the inner left panel 65 and the inner right panel 72, which have a band shape whose outer shape is curved in a substantially C shape. Since the tip 27a of the recess of the central recess 27 is formed by the inner coupling portion 28, it is not necessary to arrange a tether or the like for connecting the tip of the recess of the center recess 27 with the front end side of the airbag inside. , The shape of the recess on the central side and the shape of the central region can be stabilized.

In the airbag 15 of the embodiment, the restraint recess 31 is arranged only on the left side of the central recess 27 on the driver's seat side, but is restrained as in the airbag 15A shown in FIG. The recesses 31AL and 31AR may be arranged on both the left and right sides of the central recess 27A. With such a configuration, the airbag 15A can protect the occupant's head both when moving diagonally forward to the left and when moving diagonally forward to the right.

15, 15A ... Airbag, 16 ... Bag body, 26 ... Crew protection, 27 ... Central recess, 27a ... Tip, 28 ... Inner joint, 29L, 29R ... Protruding part (protruding part for oblique collision), 29a ... Top, 29b ... right side region (region on the restraint recess side), 30L, 30R ... outer joint, 31 ... restraint recess, 38 ... center side region, 39 ... end side part, 39a ... large curvature part, 40 ... center Side part, 50 ... Concave tether, 55 ... Auxiliary tether, 60 ... Outer panel, 62 ... Left part, 62a ... Outer edge, 63 ... Right part, 63a ... Outer edge, 65 ... Inner left panel, 65a ... Outer edge, 65b ... Inner edge , 72 ... Inner right panel, 72a ... Outer edge, 72b ... Inner edge, MP ... Crew, MH ... Head, PS ... Passenger seat, V ... Vehicle, M ... Passenger seat airbag device.

Claims (3)

Equipped with an airbag that can be folded and stored in the storage area in front of the passenger seat.
The airbag has a bag shape made of a flexible sheet body, and the shape at the time of completion of expansion is a substantially quadrangular pyramid shape in which the top is arranged on the front end side, and the front end side at the time of completion of expansion is the storage. attached to the site, the rear side of the completely inflated, an air bag device for configured passenger seat as the occupant protection unit capable protect multiplication members,
The occupant protection unit
When the expansion of the airbag is completed, the central recess that is recessed in the front side at substantially the center in the left-right direction and the protrusion that protrudes relatively rearward on both the left and right sides of the center recess are approximately substantially in the vertical direction. In addition to being configured to be arranged along approximately the entire upper and lower parts,
Wherein a center side at least one of the left or right of the recesses, oblique in a region to be a between the top of the tip and the protruding portion of recess of the center-side recess, at the time or an offset collision oblique collision vehicles A restraint recess for entering and restraining the head of the occupant moving forward is provided.
The restraint recess has a left side wall and a right side wall facing each other in the left-right direction, and by connecting the upper edge to each other, the lower edge to each other, and the leading edge to each other of the left side wall and the right side wall, respectively. The air is configured in a substantially pocket shape with the rear end side open, and the tip end side of the recess is connected to the front end side of the airbag by a tether arranged inside the airbag. When the expansion of the bag is completed, it is configured to be recessed forward and arranged.
The protrusion arranged adjacent to the restraint recess is configured as an oblique protrusion that can receive the head of the occupant moving diagonally forward.
In the occupant protection portion, the central region, which is the region between the tip of the recess of the central recess and the tip of the recess of the restraint recess, is a cross section substantially along the horizontal direction when the expansion of the airbag is completed. In the case, the curvature of the end side portion to be the restraint recess side is set to be larger than the curvature of the central side portion to be the center side recess side and the curvature of the restraint recess side region in the oblique protrusion. It is characterized in that it is configured as a large curvature portion that is set to be large, and the large curvature portion is arranged so as to be arranged on the restraining concave portion side rather than the left and right centers in the central side region. Airbag device for the passenger seat. The airbags are arranged substantially along the front-rear direction so as to face each other in the left-right direction with the upper wall portion and the lower wall portion which are arranged substantially along the left-right direction so as to face each other in the vertical direction. It is configured to include a left wall portion and a right wall portion, and a rear wall portion arranged substantially along the left-right direction so as to connect the upper wall portion and the lower wall portion on the occupant side.
The tip of the recess on the central side constitutes the upper wall portion, the lower wall portion, and the rear wall portion, and extends the region from the upper wall portion to the lower wall portion via the rear wall portion. It is composed of an inner connecting part formed by connecting the inner edges of a pair of inner panels which are substantially symmetrical as a strip whose outer shape is curved in a substantially C shape so as to be divided into two on the left-right direction side. ,
The top of each of the protrusions is composed of an outer connecting portion formed by connecting the outer edges of the left wall portion or the right wall portion and the inner panel to each other.
The passenger seat airbag device according to claim 1, wherein the restraint recess is formed so as to provide a tack on the inner panel. The passenger seat airbag device according to claim 1 or 2, wherein the restraint recesses are arranged on the left and right sides of the central recess.

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