JP6922803B2 - Airbag device - Google Patents

Description

The present invention relates to an airbag device having a structure including a bag-shaped airbag that expands by inflowing an expansion gas into the inside and an inflator that supplies the expansion gas to the airbag.

Conventionally, as an airbag device, an inflator having a structure in which a mounting means is projected from the outer peripheral surface of a columnar main body is inserted inside the airbag and then projected to the outside of the airbag. There was a configuration in which the inflator and the airbag were attached to the body side by fixing the inflator to the body side (see, for example, Patent Document 1). In this conventional airbag device, the insertion opening for inserting the inflator in the airbag is a stack of two panel materials, and the main body of the inflator can be inserted into each panel material from the end side. One slit extending along the direction orthogonal to the axis is formed, and the slits are arranged so as to intersect in a state where the panel materials are overlapped, and the slit is covered from the outer peripheral side of the airbag. As shown above, the cover cloth was arranged. In the conventional airbag device, the main body of the inflator is inserted into each slit from one end side so as to be inserted into the airbag, and the main body of the inflator has a slit on the other end side. It was configured to be stored in the airbag while protruding outward from the air.

JP-A-2017-81248

However, in the conventional airbag device, since the slits are arranged so as to intersect each other, if the length dimension of the slit is increased in consideration of the insertion workability, the part around the slit and the main body protruding from the slit A gap is likely to occur between the portion and the other end side, and even if the outer peripheral side is covered with a cover cloth, it is possible to prevent the expansion gas that has flowed into the airbag from leaking through such a gap. It was difficult.

The present invention solves the above-mentioned problems, and provides an airbag device capable of suppressing leakage of expansion gas flowing into the inside of the airbag even if the inflator is housed inside the airbag. The purpose.

The airbag device according to the present invention is configured to include a bag-shaped airbag that expands by inflowing expansion gas into the inside, and an inflator that supplies expansion gas to the airbag.
The inflator
It is provided with a main body having a substantially cylindrical outer shape and mounting means for mounting on the body side of the vehicle so as to project from the outer peripheral surface of the main body in the direction orthogonal to the axis of the main body.
An airbag device having a configuration in which the mounting means is projected to the outside and the main body is inserted into the airbag and then mounted on the body side.
The airbag has an insertion opening for inserting the inflator inside.
The region forming the insertion opening in the airbag has a two-layer structure in which an outer panel material composed of a flexible sheet body and an inner panel material are laminated.
Insertion openings are formed in the outer panel material and the inner panel material, respectively, and are formed so as to penetrate the outer insertion slit and the inner insertion slit for inserting the main body portion, and the outer panel material and the inner panel material. It is configured to have an insertion hole for projecting the mounting means.
The outer insertion slit and the inner insertion slit are arranged in a non-intersecting state without overlapping each other.

In the airbag device of the present invention, the insertion opening has a two-layer structure in which an outer panel material and an inner panel material are laminated, and is formed for each of the outer panel material and the inner panel material for outer insertion. The slits and the slits for inner insertion do not overlap each other and are arranged in a non-intersecting state. That is, the area of the outer insertion slit formed in the outer panel material is covered by the inner panel material, and the area of the inner insertion slit formed in the inner panel material is covered by the outer panel material. It is possible to prevent the expansion gas that has flowed into the inside from leaking to the outside through the outer insertion slit and the inner insertion slit.

Therefore, in the airbag device of the present invention, even if the inflator is housed inside the airbag, leakage of the expansion gas that has flowed into the inside can be suppressed.

Further, in the airbag device of the present invention, if the outer insertion slit and the inner insertion slit are arranged so as to be linear and substantially parallel to each other, the outer insertion slit and the inner insertion slit are arranged. It is preferable that the insertion workability of the main body of the inflator is improved as compared with the case where the above is not parallel.

Further, in the air bag device having the above configuration, the outer insertion slit and the inner insertion slit are formed substantially along the axial direction of the main body and are arranged so as to be displaced on the circumferential side of the main body. For example, when inserting the main body of the inflator into the airbag, the main body is moved so that the axial direction is approximately along the outer insertion slit and the inner insertion slit, and the outer insertion slit and the inner insertion are inserted. It will be inserted into the slit. Therefore, even if the inflator is provided with a mounting means projecting on the side orthogonal to the axis of the main body, the mounting means does not easily interfere with the outer insertion slit and the peripheral edge portion of the inner insertion slit. The main body can be smoothly inserted into the airbag through the outer insertion slit and the inner insertion slit. That is, the work of inserting the main body into the outer insertion slit and the inner insertion slit and the work of protruding from the insertion hole of the mounting means projecting from the main body can be performed by moving the main body to the side perpendicular to the axis. , It can be performed only by rotating, and the insertion of the main body into the outer insertion slit and the inner insertion slit and the protrusion of the mounting means from the insertion hole can be easily performed. Therefore, the workability of inserting the inflator into the airbag is further improved, which is preferable.

Further, in the airbag device having the above configuration, a flexible lid panel configured to close the outer insertion slit on the outer peripheral side of the outer panel material is arranged in the insertion opening. ,
It is preferable that the lid panel is configured so that one end side is connected to the outer panel material side and the other end side is provided with a mounting hole for projecting the mounting means corresponding to the insertion hole.

If the airbag device has the above configuration, the outer peripheral side of the outer insertion slit can be covered by the lid panel, so that the expansion gas flowing into the inside of the airbag can be prevented from leaking from the outer insertion slit. , Leakage of expansion gas can be further suppressed.

Further, in the airbag device having the above configuration, the inflator is covered with a flexible tubular inner tube on the outer peripheral side of the main body and stored in the airbag.
Inner tube,
A tube body that covers the outer peripheral side of the main body and has an outlet that allows the expansion gas discharged from the main body to flow out.
A cover that is connected to the tube body on one end side, is arranged so as to extend from the tube body with the other end side as the free end, and can cover the inner insertion slit formed in the inner panel material from the inner peripheral side. Department and
It is preferable that the configuration is provided with.

If the airbag device has the above configuration, the expansion gas discharged from the main body of the inflator will flow into the airbag through the outlet of the tube main body, and will be directed toward the slit side for inner insertion. It is possible to suppress the flow to. Further, the inner peripheral side of the inner insertion slit can be covered by a cover portion, and since the other end side of this cover portion is a free end, the expansion gas flowing into the inside of the airbag causes the expansion gas. The mode is such that it is pressed against the inner peripheral surface side (inner peripheral surface side of the inner panel material) of the inner insertion slit, and the expansion gas that has flowed into the inside of the airbag leaks to the outside through the inner insertion slit. It can be prevented and the leakage of the expansion gas can be suppressed more accurately.

Furthermore, in the airbag device having the above configuration, the outer insertion slit and the inner insertion slit are both arranged in a region on one side extending from the insertion hole along the circumferential direction of the main body. For example, as compared with the case where the outer insertion slit and the inner insertion slit are arranged on both sides with the insertion hole in between, it is possible to secure the strength of the peripheral portion of the insertion hole in the airbag, which is preferable.

Furthermore, when the airbag device has such a configuration, if the inner insertion slit is formed at a position closer to the insertion hole than the outer insertion slit, the main body of the inflator is formed on the outer side. Compared with the case where the inner insertion slit and the outer insertion slit are arranged in the opposite positions when the attachment means is projected from the insertion hole after being inserted into the inside through the insertion slit and the inner insertion slit. Since the inflator mounting means inserted into the inner insertion slit is arranged near the insertion hole, it is easy to project the mounting means from the insertion hole after insertion into the inner insertion slit. It is preferable.

Further, in the airbag device of the present invention, the insertion opening is configured such that a guide member serving as a guide when the inflator is inserted into the inside is arranged between the outer panel material and the inner panel material.
The guide member is composed of a flexible sheet body so that one end side can be overlapped with the inner peripheral side of the outer panel material at a portion between the outer insertion slit and the inner insertion slit. It is preferable that the region on the other end side is arranged so as to cover the inner peripheral side of the inner panel material by connecting to the outer panel material and inserting the inner insertion slit.

If the airbag device has the above configuration, when the main body of the inflator is inserted into the inside through the slit for inner insertion, the guide member suppresses the entry between the inner panel material and the outer panel material. Since it can be guided into the airbag, the main body can be easily inserted into the airbag.

Further, in the airbag device having the above configuration, a flexible lid panel configured to close the outer insertion slit on the outer peripheral side of the outer panel material is arranged in the insertion opening. Being done
It is preferable that the lid panel is configured so that one end side is connected to the outer panel material side and the other end side is provided with a mounting hole for projecting the mounting means corresponding to the insertion hole.

If the airbag device has the above configuration, the outer peripheral side of the outer insertion slit can be covered by the lid panel, so that the expansion gas flowing into the inside of the airbag can be prevented from leaking from the outer insertion slit. , Leakage of expansion gas can be further suppressed.

Furthermore, in the airbag device having the above configuration, if the outer insertion slit and the inner insertion slit are arranged so as to be linear and substantially parallel to each other, the outer insertion slit and the inner insertion slit are arranged. Compared with the case where the slits are not parallel to each other, the insertion workability of the main body of the inflator is improved, which is preferable.

Furthermore, in the airbag device having the above configuration, the outer insertion slit and the inner insertion slit are formed substantially along the axial direction of the main body and are arranged so as to be displaced on the circumferential side of the main body. For example, when inserting the main body into the airbag, the main body is moved so that the axial direction is approximately along the outer insertion slit and the inner insertion slit, and the outer insertion slit and the inner insertion slit are inserted. Will be inserted into. Therefore, even if the inflator is provided with a mounting means projecting on the side orthogonal to the axis of the main body, the mounting means does not easily interfere with the outer insertion slit and the peripheral edge portion of the inner insertion slit. The main body can be smoothly inserted into the airbag through the outer insertion slit and the inner insertion slit. That is, the work of inserting the main body into the outer insertion slit and the inner insertion slit and the work of protruding from the insertion hole of the mounting means projecting from the main body can be performed by moving the main body to the side perpendicular to the axis. , It can be performed only by rotating, and the insertion of the main body into the outer insertion slit and the inner insertion slit and the protrusion of the mounting means from the insertion hole can be easily performed. Therefore, the workability of inserting the inflator into the airbag is further improved, which is preferable.

Furthermore, in the airbag device having the above configuration, the lid panel may be configured so that the outer insertion slit is inserted so that one end side is arranged on the inner peripheral side of the outer panel material.

Furthermore, in the airbag device having the above configuration, if the insertion hole is formed in the region between the outer insertion slit and the inner insertion slit, the airbag is formed between the outer insertion slit and the inner insertion slit. Since the area between the slit and the slit is pressed by the main body of the inflator and attached to the body side of the vehicle, the expansion gas that has flowed into the airbag leaks even if the airbag is not provided with a lid panel. Can be accurately suppressed, which is preferable.

Furthermore, in the airbag device having the above configuration, the outer insertion slit and the inner insertion slit may be arranged together in a region on one side extending from the insertion hole along the circumferential direction of the main body. Compared with the case where the outer insertion slit and the inner insertion slit are arranged on both sides with the insertion hole in between, the strength of the peripheral portion of the insertion hole in the airbag can be ensured, which is preferable.

It is a top view of the vehicle which mounted the pedestrian airbag device which is one Embodiment of this invention. It is a schematic vertical sectional view along the front-rear direction of the pedestrian airbag device of an embodiment. It is a schematic enlarged vertical sectional view along the front-rear direction of the pedestrian airbag device of an embodiment, and shows the part of an inflator. In the pedestrian airbag device of the embodiment, it is a schematic vertical sectional view along the left-right direction which shows the part of an inflator. It is a top view of the state in which the airbag used in the pedestrian airbag device of the embodiment is flatly unfolded. It is a bottom view of the state where the airbag of FIG. 5 is unfolded flat. It is sectional drawing of the state in which the airbag of FIG. 5 is inflated by itself, and corresponds to the part VII-VII of FIG. It is a cross-sectional view of the state in which the airbag of FIG. 5 is inflated by itself, and corresponds to the part VIII-VIII of FIG. FIG. 5 is a partially enlarged bottom view showing a portion of an insertion opening in the airbag of FIG. FIG. 5 is a partially enlarged cross-sectional view showing a portion of an insertion opening and an inner tube in the airbag of FIG. FIG. 5 is a schematic exploded perspective view showing a portion of an insertion opening in the airbag of FIG. It is a bottom view of the airbag of FIG. 5 in a state where the inner tube arranged inside the insertion opening is flatly unfolded. It is a vertical sectional view of the inner tube of FIG. FIG. 5 is a partially enlarged bottom view showing a portion of a mounting piece in the airbag of FIG. It is sectional drawing of the XV-XV part of FIG. It is sectional drawing of the XVI-XVI part of FIG. FIG. 5 is a vertical cross-sectional view of the pedestrian airbag device of the embodiment along the front-rear direction in a state where the mounting piece is mounted on the case. FIG. 5 is a vertical cross-sectional view of the pedestrian airbag device of the embodiment along the left-right direction in a state where the mounting piece is mounted on the case. It is a top view which arranged the base materials constituting the airbag of FIG. It is a top view which arranged the remaining base materials constituting the airbag of FIG. FIG. 5 is a schematic plan view of a state in which the airbag has completed expansion in the pedestrian airbag device of the embodiment. FIG. 5 is a partially enlarged schematic vertical sectional view showing a portion near an inflator in a state where the airbag has completed expansion in the pedestrian airbag device of the embodiment. FIG. 5 is a schematic vertical cross-sectional view of a portion of a mounting piece in a state where the airbag has completed expansion in the pedestrian airbag device of the embodiment. It is a partially enlarged bottom view which shows the part of the opening for insertion in the airbag of another embodiment of this invention. FIG. 4 is a partially enlarged cross-sectional view showing a portion of an insertion opening and an inner tube in the airbag of FIG. 24. FIG. 6 is a schematic exploded perspective view showing a portion of an insertion opening in the airbag of FIG. 24. FIG. 5 is a partially enlarged cross-sectional view showing a portion of an insertion opening and an inner tube in an airbag according to still another embodiment of the present invention. FIG. 5 is a partially enlarged cross-sectional view showing a portion of an insertion opening and an inner tube in an airbag according to still another embodiment of the present invention. FIG. 5 is a partially enlarged bottom view showing a portion of an insertion opening in an airbag according to still another embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the embodiment, a pedestrian airbag device M arranged near the rear end 15c of the hood panel 15 in the vehicle V will be taken as an example for description. As shown in FIGS. 1 to 3, the pedestrian airbag device M (hereinafter abbreviated as “airbag device”) of the embodiment is located close to the rear side of the rear end 15c of the hood panel 15. It is arranged at a position approximately central in the left-right direction of the vehicle V between the left and right front pillars 5L and 5R. In this specification, unless otherwise specified, the front-rear, up-down, and left-right directions are described in accordance with the front-rear, up-down, and left-right directions of the vehicle V, respectively.

In the case of the embodiment, the front bumper 6 (see FIG. 1) of the vehicle V is provided with a sensor (not shown) capable of detecting a collision with a pedestrian, and a signal from the sensor is input, which is not shown. The actuating circuit is configured to actuate the inflator 30 of the airbag device M when it detects a collision between the vehicle V and a pedestrian based on a signal from the sensor.

As shown in FIG. 1, the hood panel 15 is arranged so as to cover the upper part of the engine room in the vehicle V, and the vehicle V is provided by a hinge portion (not shown) arranged near the rear end 15c on both the left and right edge sides. It is connected to the body 1 side of the body 1 side so that it can be opened and closed by opening the front. In the case of the embodiment, the hood panel 15 is made of a steel plate or a plate material such as aluminum (aluminum alloy), and is stronger than the outer panel 15a on the upper surface side and the outer panel 15a located on the lower surface side as shown in FIGS. It is provided with an inner panel 15b, which is an improved version of the above. As shown in FIG. 1, the hood panel 15 is arranged on the left and right sides of the rear end 15c side so that the center in the left-right direction is positioned in the front and the left and right ends are located in the rear in accordance with the front windshield 4 described later. It is configured to be curved with respect to the direction.

As shown in FIGS. 2 and 3, a cowl 7 composed of a highly rigid cowl panel 7a on the body 1 side and a synthetic resin cowl louver 7b above the cowl panel 7a is arranged behind the hood panel 15. Has been done. The cowl louver 7b is arranged so that the rear end side is connected to the lower portion 4a side of the front windshield 4. The cowl 7 is also formed by being curved in the left-right direction so that the left and right centers are positioned forward and the left and right ends are located rearward in accordance with the curved shape of the rear end 15c of the hood panel 15. (See Fig. 1). Further, as shown in FIG. 1, a wiper 8 is arranged at the portion of the cowl 7. The wiper 8 is arranged so as to project upward from the cowl louver 7b as shown by the alternate long and short dash line in FIGS. Front pillars 5L and 5R are arranged on the left and right outer sides of the front windshield 4.

As shown in FIGS. 2 to 4, the airbag device M is folded into an airbag 45, an inflator 30 that supplies an expansion gas to the airbag 45, and a case 20 that houses the airbag 45 and the inflator 30. It includes an airbag cover 25 that covers the airbag 45, and a mounting bracket 100 that mounts the mounting piece 72 (72L, 72R) of the airbag 45 to the case 20.

As shown in FIGS. 2 and 3, the case 20 is made of sheet metal and has a bottom wall portion 21 and a substantially square tubular peripheral wall portion 22 extending upward from the bottom wall portion 21 and opening the upper end side. , And has a substantially box shape, and has a configuration in which the inflatable airbag 45 is projected from the protruding opening 20a on the upper end side. A mounting bolt 39 as a mounting means for mounting the inflator 30 and a mounting bolt 102 for mounting the mounting piece 72 of the airbag 45 are inserted into the bottom wall portion 21 and fastened with nuts 42 and 104, respectively. Mounting holes 21a for the purpose are formed (see FIGS. 2 to 4, 17, 18 and 22). Then, in the airbag device M of the embodiment, the bottom wall portion 21 of the case 20 constitutes a member on the body 1 side to which the inflator 30 is attached. The case 20 is arranged so that the front area is located directly below the rear end 15c of the hood panel 15 and the rear area is located behind the hood panel 15, and a bracket (not shown) is used. Therefore, it is configured to be attached to the cowl panel 7a on the body 1 side. Further, as shown in FIG. 1, the case 20 is positioned in the left-right direction so that the left and right centers are positioned in the front and the left and right ends are located in the rear in accordance with the curved shape of the rear end 15c of the hood panel 15. It is curved with respect to it.

The airbag cover 25 is made of a soft synthetic resin such as a polyolefin-based thermoplastic elastomer (TPO), is arranged so as to cover the protruding opening 20a on the upper end side of the case 20, and expands and expands the airbag 45. It is configured to have a door portion 26 that is sometimes pushed by the airbag 45 and can be opened (see FIGS. 2, 3, 22, and 23). The airbag cover 25 is attached to the case 20 at a predetermined location by using an attachment means (not shown).

The inflator 30 is configured to include a cylinder-type inflator main body 31 having a substantially cylindrical outer shape, and a mounting bracket 35 for attaching the inflator main body 31 to the case 20.

The inflator main body 31 has a substantially columnar outer shape, and as shown in FIGS. It is configured to be arranged inside a position that is approximately centered on the front, back, left, and right (see the two-dot chain line in FIGS. 5 and 6). The inflator main body 31 is configured by disposing a gas discharge portion 32 having a gas discharge port capable of discharging expansion gas on one end side (tip side, in the case of the embodiment, the left end 31a side) in the axial direction. It is electrically connected to the operating circuit via a lead wire (not shown) extending from the other end side in the axial direction (the original side, in the case of the embodiment, the right end 31b side).

As shown in FIGS. 3 and 4, the mounting brackets 35 for mounting the inflator main body 31 to the case 20 include a holding portion 36 for holding the inflator main body 31 and a plurality of mounting brackets 35 protruding downward from the holding portion 36 (in the case of the embodiment, in the case of the embodiment). It is configured to include three) mounting bolts 39. The holding portion 36 is made of sheet metal and is configured as a strip extending substantially along the left-right direction (axial direction of the inflator body 31) so as to support the lower surface side of the inflator body 31. In the case of (3), support piece portions 37 for supporting the inflator main body 31 are arranged so as to project from both front and rear sides. Each support piece portion 37 is formed so as to be able to support the outer peripheral surface 31c of the inflator main body 31 and be inclined so as to extend upward from the front and rear edges of the holding portion 36 with the tip facing outward in the front-rear direction. It has a symmetrical shape in the front and back (see FIG. 3). In the case of the embodiment, the support piece portion 37 is formed at a position corresponding to the mounting bolt 39. The mounting bolts 39 are formed so as to project downward at three locations, one on the left and right ends of the holding portion 36 and the other at substantially the center in the left-right direction. Then, in the embodiment, the mounting bracket 35 has a configuration in which the inflator main body 31 is attached by winding the clamp 40 from the outer peripheral side in a state where the inflator main body 31 is held by the holding portion 36. In the case of the embodiment, the clamps 40 are arranged at two locations on the left and right ends.

That is, in the inflator 30 of the embodiment, as shown in FIGS. Bolt 39 is projected. Then, the inflator 30 uses a clamp 40 to attach the inflator body 31 to the mounting bracket 35, and causes the mounting bolts 39 to protrude outward from the insertion holes 55 and the mounting holes 62, which will be described later, so that the inflator main body 31 is attached to the mounting bracket 35. The structure is such that the 31 and the holding portion 36 of the mounting bracket 35 are housed inside the airbag 45 (see the alternate long and short dash line in FIG. 7). The inflator 30 has a configuration in which the inflator main body 31 and the holding portion 36 of the mounting bracket 35 are inserted into the airbag 45 and attached to the bottom wall portion 21 of the case 20 which is a member on the body 1 side. Each mounting bolt 39 as a mounting means protruding from the lid panel 58 is projected from the bottom wall portion 21 of the case 20 and fastened with a nut 42, so that it can be mounted on the case 20 together with the airbag 45 (FIG. FIG. 3). Further, in the embodiment, the inflator 30 has an airbag in which the outer peripheral side of the inflator main body 31 and the holding portion 36 of the mounting bracket 35 is covered with the tube main body 81 of the flexible tubular inner tube 80. It is configured to be stored in 45.

As shown in FIGS. 5 to 8, the airbag 45 includes a bag body 46 that expands by inflowing expansion gas into the bag body, and a mounting piece portion 72 that attaches the vehicle body side wall portion 46a side of the bag body 46 to the case 20. The bag body 46 includes an inner tube 80 that covers the outer peripheral side of the inflator 30. Further, the bag body 46 has an insertion opening 49 into which the inflator 30 is inserted.

The shape of the bag body 46 when expansion is completed is a substantially U-shape that is wide to the left and right when viewed from the front side, and is arranged substantially along the lower portion 4a of the front windshield 4 in the left-right direction. The lateral expansion portion 48 is provided, and the vertical expansion portions 65L and 65R extending rearward from both ends of the lateral expansion portion 48 and covering the lower 5a side of the front surface of the left and right front pillars 5L and 5R, respectively. .. The bag body 46 has a pedestrian side wall portion 46b located on the upper surface side when expansion is completed, and a vehicle body side wall portion 46a located on the lower surface side so as to face the pedestrian side wall portion 46b, and the pedestrian side wall portion 46b. The outer peripheral edges of the vehicle body and the side wall portion 46a of the vehicle body are joined (sewn) over the entire circumference to form a bag shape.

In the case of the embodiment, the lateral expansion portion 48 covers the upper surface side of the region from the portion on the rear end 15c side of the hood panel 15 to the lower portion 4a side of the front windshield 4 via the cowl 7 when the expansion is completed. (See FIGS. 21 and 23). The inflator 30 is housed in the substantially center of the front, rear, left, and right sides of the lateral expansion portion 48, and the region of the side wall portion 46a of the vehicle body, which is substantially the center of the front, rear, left, and right sides of the lateral expansion portion 48, is as shown in FIG. , An insertion opening 49 for inserting the inflator 30 into the inside is configured.

The insertion opening 49 is, in detail, in the vehicle body side wall portion 46a, between the front center tether 68 and the rear center tether 67, which will be described later, and the region between the end side tethers 69L and 69R, that is, front, rear, left and right. The region forming the insertion opening 49 is formed at a position substantially at the center of the vehicle body, and the reinforcing panel 51 is arranged inside the vehicle body side wall portion 46a to form a vehicle body side wall portion 46a (outer panel material). It has a two-layer structure in which a reinforcing panel 51 (inner panel material) is laminated (see FIGS. 9 and 10). The reinforcing panel 51 as the inner panel material is configured such that the outer shape is a substantially rectangular shape capable of covering the entire insertion opening 49, and in the case of the embodiment, the front edge 51a side and the trailing edge 51b side. Are sewn together at the time of connecting (sewn) the front side central tether 68 and the rear side center tether 67 to the vehicle body side wall portion 46a, respectively (see FIG. 7). The width dimension W1 (see FIG. 9) on the left-right side of the reinforcing panel 51 includes the length dimension L1 (see FIG. 4) of the inflator body 31 and the width dimension W4 (see FIG. 4) on the left-right side of the tube body 81 in the inner tube 80. It is set to be larger than (see FIG. 12) and is set to about 1/3 of the width dimension W2 (see FIG. 6) on the left-right side of the bag body 46 in a flatly unfolded state.

As shown in FIGS. 9 to 11, the insertion openings 49 are formed in the outer insertion slit 53 formed in the vehicle body side wall 46a as the outer panel material and the inner insertion formed in the reinforcing panel 51 as the inner panel material. A slit 54 for use, three insertion holes 55 formed so as to penetrate the side wall portion 46a of the vehicle body and the reinforcing panel 51, and a lid panel 58 arranged on the outer peripheral side of the side wall portion 46a of the vehicle body are provided.

The outer insertion slit 53 and the inner insertion slit 54 are for inserting the inflator 30 (the inflator main body 31 as the main body), and are arranged in a straight line, not overlapping each other, and in a non-intersecting state. ing. Specifically, in the case of the embodiment, the outer insertion slit 53 and the inner insertion slit 54 are substantially aligned in the left-right direction so as to be along the axial direction of the inflator main body 31, respectively, as shown in FIG. It is formed in a straight line. Further, the outer insertion slit 53 and the inner insertion slit 54 are displaced in the front-rear direction (the circumferential direction side of the inflator main body 31 when mounted on the vehicle) in a state where the bag main body 46 is spread flat and are in a non-intersecting state. Have been placed. In the embodiment, the outer insertion slit 53 and the inner insertion slit 54 are formed substantially in parallel. Specifically, the inner insertion slit 54 formed in the reinforcing panel 51 is arranged so as to be displaced forward from the outer insertion slit 53. In the embodiment, the outer insertion slit 53 and the inner insertion slit 54 are configured with slightly different length dimensions. Specifically, the outer insertion slit 53 arranged on the outer side has a length dimension L2 set to be slightly smaller than the length dimension L3 of the inner insertion slit 54 (see FIGS. 9 and 11). The outer insertion slit 53 is set to be shorter than the length dimension of the joint portion 59 that connects (sews) the rear end 58b side of the lid panel 58 to the vehicle body side wall portion 46a in the length dimension L2. The inner insertion slit 54 is configured so that the length dimension L3 is substantially the same as the separation distance D1 (see FIG. 9) between the insertion holes 55 arranged on both the left and right end sides. The length dimension L3 of the inner insertion slit 54 is set to be smaller than the length dimension L1 of the inflator main body 31 and smaller than the width dimension W3 on the left-right side of the lid panel 58. Specifically, the length dimension L3 of the inner insertion slit 54 is set to about 4/7 of the length dimension L1 of the inflator main body 31, and the length dimension L2 of the outer insertion slit 53 is the length dimension L2 of the inflator main body 31. It is set to about 1/2 of the length dimension L1. The length dimensions L2 and L3 of the outer insertion slit 53 and the inner insertion slit 54 are set so that the inflator 30 (the inflator main body 31 with the mounting bracket 35 attached) can be smoothly inserted and is set as small as possible. The inner insertion slit 54 arranged inside is more than the outer insertion slit 53 in consideration of the insertion workability of the inflator 30 after the insertion work into the outer insertion slit 53. The length dimension is set slightly larger. That is, in the embodiment, the outer insertion slit 53 and the inner insertion slit 54 are inserted into the bag body 46 with the inflator 30 protruding from the insertion hole 55 with the mounting bolt 39. Behind the main body 31, it is arranged in the area of the width dimension in the left-right direction of the inflator main body 31. Further, the separation distance D2 (see FIG. 9) between the outer insertion slit 53 and the inner insertion slit 54 in the state where the bag main body 46 is deployed flat is the outer diameter dimension D3 (see FIG. 3) of the inflator main body 31. It is set to be almost the same.

The insertion hole 55 is for projecting the mounting bolt 39 of the inflator 30, and is formed so as to penetrate the reinforcing panel 51 and the side wall portion 46a of the vehicle body. The insertion holes 55 are formed at three locations along the left-right direction. The insertion hole 55 is formed in a region on the front side of the inner insertion slit 54 as shown in FIG. 9 in a state where the bag main body 46 is expanded flat. That is, in the embodiment, the inner insertion slit 54 is formed at a position closer to the insertion hole 55 than the outer insertion slit 53. Further, both the inner insertion slit 54 and the outer insertion slit 53 are formed in a region behind the insertion hole 55 in a state where the bag main body 46 is expanded flat. In other words, the inner insertion slit 54 and the outer insertion slit 53 are provided in a region on one side (rear region) extending from the insertion hole 55 along the circumferential direction of the inflator main body 31 when the vehicle is mounted. It is arranged.

The lid panel 58 is made of a flexible seat body, and is configured to be able to close the outer insertion slit 53 on the outer peripheral side of the side wall portion 46a of the vehicle body (see FIG. 9). The outer shape of the lid panel 58 is rectangular with a wide width in the left-right direction. The width dimension W3 (see FIG. 9) on the left-right side of the lid panel 58 is set to be larger than the length dimension L2 of the outer insertion slit 53 and smaller than the length dimension L1 of the inflator main body 31. The width dimension W3 on the left-right side of the lid panel 58 is set to be larger than the length dimension L3 of the inner insertion slit 54, and is set to about twice the length dimension L2 of the outer insertion slit 53. .. Further, the width dimension W3 on the left-right side of the lid panel 58 is set to about 7/10 of the width dimension W1 on the left-right direction side of the reinforcing panel 51. The width dimension of the lid panel 58 on the front-rear side is set smaller than the width dimension of the reinforcing panel 51 on the front-rear direction side. Then, the lid panel 58 has a rear end 58b side, which is one end side, coupled (sewn) to the vehicle body side wall portion 46a and the reinforcing panel 51. Specifically, the lid panel 58 is located close to the rear end 58b side on the rear side of the outer insertion slit 53 (the outer insertion slit 53 and the rear center tether 67) in a state where the bag body 46 is flatly deployed. It is connected to the vehicle body side wall portion 46a and the reinforcing panel 51 over substantially the entire left and right sides.

As shown in FIG. 9, the connecting portion 59 for connecting (sewing) the rear end 58b of the lid panel 58 to the vehicle body side wall portion 46a and the reinforcing panel 51 is along the left-right direction (substantially parallel to the outer insertion slit 53). ) It is configured to include a linear main body 60 formed continuously and a terminal portion 61 formed so that the tip 61a faces forward on both left and right ends of the main body 60. The main body 60 is configured to have a larger length than the outer insertion slit 53 so that both left and right ends are located on the left and right outer sides of the outer insertion slit 53. The terminal portion 61 is arranged on the left and right outside of the outer insertion slit 53, and has a substantially straight line along the front-rear direction so that the tip 61a is positioned on the front side of the outer insertion slit 53. , (See FIG. 9). That is, the outer insertion slit 53 is surrounded on three sides except the front side by the binding site 59. With the bag body 46 deployed flat, the separation distance D6 (see FIG. 9) between the body 60 and the outer insertion slit 53 at the binding site 59 is the inflator when the inflator 30 is inserted into the airbag 45. The main body 31 is set to a size that allows it to be inserted into the outer insertion slit 53 without any trouble. On the front end 58a side, which is the other end side of the lid panel 58, mounting holes 62 for projecting the mounting bolts 39 of the inflator 30 are formed at three locations along the left-right direction corresponding to the insertion holes 55. ing. That is, the lid panel 58 is configured to cover the entire arrangement area of the inner insertion slit 54 and the outer insertion slit 53 in a state where the bag main body 46 is spread flat. In the case of the embodiment, in the lid panel 58, the two lid panel base cloths 92 shown in FIG. 20 are overlapped, the front end side portion is folded in half, and the peripheral portion of the mounting hole 62 is overlapped with four sheets. Is formed as.

Inside the bag body 46, there is a rear central tether 67 that connects the pedestrian side wall 46b and the vehicle body side wall 46a so that the separation distance between the pedestrian side wall 46b and the vehicle body side wall 46a when expansion is completed can be regulated. , The front center tether 68 and the end side tether 69 (69L, 69R) are arranged (see FIGS. 5 to 8). The rear central tether 67 is arranged from the lateral expansion portion 48 to the regions of the left and right vertical expansion portions 65L and 65R, and is a region (insertion opening 49) on the rear side of the front and rear center of the lateral expansion portion 48. In the rear region), it is arranged as a gentle curve over the entire length so as to substantially follow the trailing edge of the flattened bag body 46. As shown in FIGS. 7, 8 and 19, the rear central tether 67 includes a vehicle body side portion 93a arranged on the vehicle body side wall portion 46a side and a pedestrian side portion 93b arranged on the pedestrian side wall portion 46b side. , Is formed from two tether base cloths 93. The front center tether 68 is left and right so as to substantially follow the front edge of the flatly deployed bag body 46 in the region (the region on the front side of the insertion opening 49) that is on the front side of the front and rear center of the lateral expansion portion 48. It is arranged as a substantially straight line along the direction. As shown in FIGS. 7, 8 and 20, the front central tether 68 also has a vehicle body side portion 94a arranged on the vehicle body side wall portion 46a side and a pedestrian side portion 94b arranged on the pedestrian side wall portion 46b side. It is formed from two tether base cloths 94. The end-side tethers 69 (69L, 69R) are regions between the front-side central tether 68 and the rear-side central tether 67 (left and right regions of the insertion opening 49), and each longitudinal expansion. They are arranged at positions in front of the portions 65L and 65R, respectively. The end-side tethers 69L and 69R are also arranged substantially symmetrically in a substantially straight line along the left-right direction. As shown in FIGS. 8 and 20, the end-side tethers 69L and 69R also have a vehicle body side portion 95a arranged on the vehicle body side wall portion 46a side and a pedestrian side portion 95b arranged on the pedestrian side wall portion 46b side, respectively. It is formed from two tether base cloths 95.

The mounting piece portion 72 (72L, 72R) for attaching the vehicle body side wall portion 46a side of the bag body 46 to the case 20 is composed of a flexible seat body as a separate body from the bag body 46, and is shown in FIG. , 14 to 16 are connected to the side wall portion 46a of the vehicle body. The mounting piece portions 72 (72L, 72R) are configured to be mounted on the bottom wall portion 21 of the case 20 by using the mounting bracket 100 (see FIGS. 17 and 18). In the case of the embodiment, as shown in FIG. 6, the mounting piece 72 (72L, 72R) includes the insertion opening 49, the tethers 69L and 69R on each end side, and the tethers 69L and 69R on each end side in a state where the bag body 46 is expanded flat. It is arranged at two positions between the two positions so as to be substantially symmetrical. Further, each mounting piece portion 72 is arranged between the front side central tether 68 and the rear side center tether 67 at a position substantially centered on the front and rear sides.

As shown in FIGS. 14 to 16, each mounting piece portion 72 is configured to include a mounting piece main body 73 and a reinforcing piece portion 77 arranged between the mounting piece main body 73 and the vehicle body side wall portion 46a. There is. The mounting piece main body 73 is formed with a through hole 74 through which a mounting bolt 102, which will be described later, is formed in the mounting bracket 100 and can be inserted. In the case of the embodiment, the mounting piece main body 73 has a substantially rectangular shape with the front-rear direction side slightly wider, and two through holes 74 are arranged side by side in the left-right direction side at a position substantially at the center in the front-rear direction. It is configured. The reinforcing piece portion 77 is formed to be one size larger than the mounting piece main body 73, and has a substantially rectangular shape with the left-right direction side slightly wider. It is connected (sewn) to the side wall portion 46a of the vehicle body by the connecting portion 78 that is continuously formed over the entire circumference. The mounting piece main body 73 is on the front edge 73a side and the trailing edge 73b side, which are both front and rear sides of the through hole 74, and is a portion inside the connecting portion 78 that connects the reinforcing piece portion 77 to the vehicle body side wall portion 46a. Are sewn (combined) to the side wall portion 46a of the vehicle body together with the reinforcing piece portion 77, respectively. The coupling portions 75F and 75R that connect the mounting piece main body 73 to the side wall portion 46a of the vehicle body are formed in a linear shape substantially along the left-right direction over substantially the entire left and right sides of the mounting piece main body 73. As shown by the alternate long and short dash line in FIGS. The mounting plate 101 of the mounting bracket 100 is inserted between the reinforcing piece portion 77 and the left edge 73c side or the right edge 73d side on which the 75F and 75R are not arranged. The separation distance D4 (see FIG. 14) between the binding sites 75F and 75R in the mounting piece main body 73 makes it easy to insert the mounting plate 101 and insert the mounting bolt 102 into the through hole 74, and penetrates the mounting bolt 102. The dimensions are set so that the mounting bolt 102 can be maintained in a state of protruding from the hole 74.

The inner tube 80 that covers the outer peripheral side of the inflator 30 (the holding portion 36 in the inflator main body 31 and the mounting bracket 35) is composed of a flexible sheet body, and as shown in FIGS. 12 and 13, the inflator It includes a tube main body 81 that covers the outer peripheral side of the main body 31 and the holding portion 36, and a cover portion 85 that is arranged so as to extend from the tube main body 81.

The tube main body 81 is configured to cover the outer peripheral side of the inflator main body 31 and the holding portion 36, and to include outlets 82A and 82B for discharging the expansion gas discharged from the gas discharge portion 32 of the inflator main body 31. .. In the case of the embodiment, the tube main body 81 is configured such that the inflator 30 is inserted from the right end 81b side with the right end 81b side in a flat unfolded state as the base side, and the left and right end sides are opened. The left end 81a side, which is the tip side, is branched, and two outlets 82A and 82B are provided on the left end 81a side to allow the expansion gas discharged from the inflator main body 31 to flow out toward the left and diagonally upward to the right. It is configured (see FIG. 12). The tube body 81 is formed with three insertion holes 83 along the left-right direction for projecting the mounting bolts 39 of the mounting bracket 35 holding the inflator body 31. The tube main body 81 is configured to cover the outer peripheral side of the inflator main body 31 over the entire circumference, and the width dimension W4 (see FIG. 12) on the left-right direction side in a flat unfolded state is the inflator main body 31. The length dimension is set to be larger than L1. Further, the width dimension W4 on the left-right side of the tube body 81 is set to be larger than the width dimension W3 on the left-right direction side of the lid panel 58 in the insertion opening 49 in the state where the bag body 46 is deployed flat. The tube main body 81 is arranged so as to extend to the left and right outward from the lid panel 58 in a state of being stored in the bag main body 46 (see FIG. 9). The tube body 81 is formed into a tubular shape by folding the tube body base cloth 96 shown in FIG. 20 in half and sewing (bonding) the corresponding edges to each other.

The width dimension of the cover portion 85 on the left-right direction side is substantially the same as that of the tube main body 81, and the base portion 85a side, which is one end side, is connected (sewn) to the vicinity of the front side of the insertion hole 83 in the tube main body 81. ), And is arranged so as to extend rearward from the tube body 81 with the tip 85b side, which is the other end side, as the free end (see FIG. 10). An insertion hole 86 for projecting the mounting bolt 39 of the mounting bracket 35 is formed at a position corresponding to the insertion hole 83 formed in the tube body 81 near the base portion 85a of the cover portion 85 (FIG. FIG. See 12 and 13). The cover portion 85 has a length dimension L4 (distance from the insertion hole 86 to the tip 85b, see FIG. 12), and the separation distance D5 between the insertion hole 55 and the outer insertion slit 53 in a state where the bag body 46 is horizontally expanded. It is set larger than (see FIG. 9) so that when mounted on a vehicle, it extends beyond the inner insertion slit 54 and further rearward than the outer insertion slit 53 on the inner peripheral side of the reinforcing panel 51. It is a configuration to be arranged. That is, in the embodiment, the tip 85b, which is the free end of the cover portion 85, is arranged at a position beyond the inner insertion slit 54 and behind the outer insertion slit 53. The cover portion 85 is configured so that the width dimension on the left-right direction side is substantially the same as that of the tube main body 81. In other words, the width dimension on the left-right direction side is set from the width dimension W3 on the left-right direction side of the lid panel 58. It is set to be larger than the length dimension L3 of the inner insertion slit 54. That is, the cover portion 85 has a configuration capable of covering the inner peripheral slit 54 formed in the reinforcing panel 51 from the inner peripheral side over the entire area.

As shown in FIGS. 19 and 20, the airbag 45 includes a vehicle body side base cloth 90 constituting the vehicle body side wall portion 46a, a pedestrian side base cloth 91 forming the pedestrian side wall portion 46b, and a lid panel 58 in the bag body 46. The base cloth 92 for the lid panel, the base cloth 93 for the tether forming the rear center tether 67, the tether base cloth 94 forming the front center tether 68, and the tether base cloth 94 forming the end side tether 69. The cloth 95, the tube body base cloth 96 forming the tube body 81 and the cover portion 85 of the inner tube 80, the cover base cloth 97, and the inner panel arranged at the insertion opening 49 in the vehicle body side wall portion 46a. It is composed of a reinforcing panel 51 as a material, a mounting piece main body 73 and a reinforcing piece portion 77 constituting the mounting piece portion 72. For these base fabrics (materials), a coated cloth coated with a coating agent for preventing gas leakage is cut into a predetermined shape on the surface of a woven cloth formed by weaving polyamide yarn, polyester yarn, or the like. It is formed.

The mounting bracket 100 for mounting the mounting piece 72 (72L, 72R) to the bottom wall 21 of the case 20 has a substantially rectangular plate-shaped mounting plate 101 and a mounting bolt 102 protruding downward from the mounting plate 101, respectively. It is configured to prepare. As shown by the alternate long and short dash line in FIG. 14, the mounting plate 101 is configured to have a substantially rectangular shape with the left-right direction side wide, and the lower surface side is mounted when mounted on the mounting piece portion 72. It is configured to be covered by one main body 73 over substantially the entire area. Two mounting bolts 102 are arranged side by side along the left-right direction. In this mounting bracket 100, the mounting bolt 102 protruding from the mounting piece main body 73 of the mounting piece portion 72 is projected from the bottom wall portion 21 of the case 20 and fastened with the nut 104, whereby the mounting piece portion 72 is attached to the case 20. It is configured to be attached to the bottom wall portion 21 of the above (see FIGS. 17 and 18).

Next, mounting of the airbag device M of the embodiment on the vehicle V will be described. In the inflator 30, the inflator body 31 is held by the mounting bracket 35 by using the clamp 40, and the mounting bolt 39 is projected from the insertion hole 83 in the tube body 81 of the inner tube 80 in advance. Let me insert it. At this time, the mounting bolt 39 is also inserted with the insertion hole 86 formed in the cover portion 85 of the inner tube 80. Then, first, the airbag 45 is folded so that it can be stored in the case 20, and the circumference of the folded airbag 45 is wrapped with a breakable wrapping material (not shown) for preventing collapse. At this time, the portions of the insertion opening 49 and the mounting piece 72 in the airbag 45 are exposed from the wrapping material. Next, the lid panel 58 of the insertion opening 49 is opened, and the inflator 30 is inserted into the bag body 46 through the inner tube 80, the outer insertion slit 53, and the inner insertion slit 54, and each mounting bolt 39 is inserted. Is projected from the insertion hole 55, and the inflator 30 is housed inside the bag body 46. At this time, the cover portion 85 of the inner tube 80 is spread flat in the bag body 46. After that, the lid panel 58 is closed so as to cover the outer insertion slit 53, and each mounting bolt 39 is inserted into the mounting hole 62 on the front end 58a side. Further, the mounting bracket 100 is attached to each mounting piece portion 72 so that the mounting bolt 102 protrudes from the through hole 74 to manufacture the airbag assembly AM. After that, the airbag assembly AM is housed in the case 20 so that the mounting bolts 39 and 102 project from the bottom wall portion 21, and the mounting bolts 39 and 102 projecting from the bottom wall portion 21. By fastening the nuts 42 and 104, the airbag 45 (bag body 46) and the inflator 30 can be attached to the case 20, and the attachment piece portion 72 can be connected to the case 20. Then, if the airbag cover 25 is attached to the case 20, a bracket (not shown) extending from the case 20 is attached to the cowl panel 7a, and the inflator body 31 is connected to an operating circuit (not shown), the airbag device M is attached to the vehicle V. Can be installed.

In the airbag device M of the embodiment, when an operating circuit (not shown) detects a collision of the vehicle V with a pedestrian based on a signal from a sensor (not shown) arranged on the front bumper 6, the inflator 30 is activated. Then, the expansion gas flows into the inside to expand the airbag 45, and the expanding airbag 45 is formed by pushing open the door portion 26 of the airbag cover 25 and pushing open the door portion 26. While projecting upward from the protruding opening 20a of the case 20, from the upper surface of the rear end 15c of the hood panel 15 to the upper surface of the cowl 7, the lower 5a side of the front surface of the front pillars 5L and 5R is covered. The expansion will be completed (see the two-point chain line in FIG. 1 and FIGS. 21 and 23).

In the airbag device M of the embodiment, the insertion opening 49 has a two-layer structure in which a vehicle body side wall portion 46a as an outer panel material and a reinforcing panel 51 as an inner panel material are laminated. The outer insertion slit 53 and the inner insertion slit 54 formed in the side wall portion 46a and the reinforcing panel 51 are located on the circumferential side of the inflator main body 31 (the front-rear direction side when the bag main body 46 is flatly deployed). They are displaced and arranged in a non-intersecting state. That is, the outer insertion slit 53 and the inner insertion slit 54 are not formed so as to overlap each other, and the region of the outer insertion slit 53 formed on the side wall portion 46a of the vehicle body is covered and reinforced by the reinforcing panel 51. Since the region of the inner insertion slit 54 formed in the panel 51 is covered by the vehicle body side wall portion 46a, the expansion gas that has flowed into the airbag 45 (bag body 46) is inserted into the outer insertion slit 53 and the inner side. It is possible to suppress leakage from the slit 54 to the outside.

Therefore, in the airbag device M of the embodiment, even if the inflator 30 is housed inside the airbag 45, leakage of the expansion gas that has flowed into the inside can be suppressed.

Further, in the airbag device M of the embodiment, since the outer insertion slit 53 and the inner insertion slit 54 are arranged so as to be linear and substantially parallel to each other, the outer insertion slit 53 and the inner insertion slit 54 are respectively arranged so as to be substantially parallel to each other. Compared with the case where the slit for insertion and the slit for inner insertion are not parallel to each other, the insertion workability of the main body of the inflator is improved. The outer insertion slit and the inner insertion slit do not have to be formed in parallel as long as they are arranged in a non-intersecting state, and may be arranged in a "H" shape, for example.

Further, in the airbag device M of the embodiment, the outer insertion slit 53 and the inner insertion slit 54 are formed substantially along the axial direction of the inflator main body 31 (main body portion) and in the circumferential direction of the inflator main body 31. It is a configuration that is arranged so as to be displaced on the side. Therefore, when the inflator 30 (inflator main body 31) is inserted into the airbag 45 (bag main body 46), the axial direction is substantially along the outer insertion slit 53 and the inner insertion slit 54 so that the inflator main body 31 Will be inserted into the outer insertion slit 53 and the inner insertion slit 54 while moving. Therefore, even if the inflator 30 is provided with a mounting bolt 39 as a mounting means projecting from the inflator main body 31 in the direction orthogonal to the axis, the mounting bolt 39 has an outer insertion slit 53 and an inner insertion slit. The inflator main body 31 can be smoothly inserted into the air bag 45 through the outer insertion slit 53 and the inner insertion slit 54 without easily interfering with the peripheral portion of the 54. That is, in the airbag device M of the embodiment, the work of inserting the inflator main body 31 into the outer insertion slit 53 and the inner insertion slit 54, and the insertion hole of the mounting bolt 39 as a mounting means projecting from the inflator main body 31. The protrusion work from 55 can be performed only by moving or rotating the inflator main body 31 in the direction perpendicular to the axis, and the inflator main body 31 is inserted into the outer insertion slit 53 and the inner insertion slit 54. The mounting bolt 39 can be easily projected from the insertion hole 55. Therefore, the workability of inserting the inflator 30 into the airbag 45 is further improved. If such a point is not taken into consideration, the outer insertion slit 53D and the inner insertion slit 54D are arranged on the axial side of the inflator main body 31 (left side in FIG. 29) as in the airbag 45D shown in FIG. It may be arranged so as to intersect the axial direction of the inflator main body 31 at the position deviated from the above. Further, as shown by the alternate long and short dash line in FIG. 29, the outer insertion slit 53D and the inner insertion slit 54D may be arranged so as to be substantially orthogonal to the axial direction of the inflator main body 31. Even in such a configuration, it is preferable that the lid panel 58D is arranged so as to cover the area between the outer insertion slit 53D and the inner insertion slit 54D.

Further, in the airbag device M of the embodiment, the insertion opening 49 is provided with a flexible lid panel 58 configured to close the outer insertion slit 53 on the outer peripheral side of the vehicle body side wall portion 46a. The lid panel 58 is arranged so that the rear end 58b is connected to the vehicle body side wall portion 46a and the reinforcing panel 51, and the mounting bolt 39 protrudes toward the front end 58a side corresponding to the insertion hole 55. The structure is such that the mounting holes 62 for making the holes 62 are arranged. Therefore, since the outer peripheral side of the outer insertion slit 53 can be covered by the lid panel 58, the expansion gas that has flowed into the inside of the airbag 45 can be prevented from leaking from the outer insertion slit 53, and the expansion gas can be prevented. Leakage can be further suppressed. In particular, in the airbag device M of the embodiment, the main body portion 60 of the binding portion 59 that connects the rear end 58b of the lid panel 58 to the vehicle body side wall portion 46a side is arranged close to the rear side of the outer insertion slit 53. In addition, the terminal portions 61, 61 arranged on both end sides of the main body 60 are formed so as to cover the left and right sides of the outer insertion slit 53, and the outer insertion slit 53 excludes the front side. It is configured to be surrounded on three sides by a binding site 59. Therefore, when the air bag 45 (bag body 46) is inflated, a gap is unlikely to occur between the peripheral edge portion of the outer insertion slit 53 in the vehicle body side wall portion 46a and the lid panel 58, and the outer side wall portion 46a for outer insertion. It is also possible to prevent the peripheral edge portion of the slit 53 from being pulled so as to open the outer insertion slit 53, and it is possible to accurately regulate the leakage of expansion gas from the outer insertion slit 53. If such a point is not taken into consideration, the lid panel may not be arranged in the insertion opening.

Further, in the airbag device M of the embodiment, the inflator 30 is housed in the airbag 45 by covering the outer peripheral side of the inflator main body 31 with a flexible tubular inner tube 80. The inner tube 80 is configured to include a tube body 81 that covers the outer peripheral side of the inflator body 31 and a cover portion 85 that is arranged so as to extend from the tube body 81, and the cover portion 85 is on one end side. The base portion 85a side is coupled to the tube body 81, and the tip 85b side, which is the other end side, extends from the tube body 81 and covers the inner insertion slit 54 formed in the reinforcing panel 51 from the inner peripheral side. It is configured to be possible. Therefore, the expansion gas discharged from the inflator main body 31 flows into the airbag 45 (bag main body 46) through the outlets 82A and 82B of the tube main body 81, and enters the inner insertion slit 54 side. It is possible to suppress the flow toward the direction. Further, the inner peripheral side of the inner insertion slit 54 can be covered by the cover portion 85, and since the tip 85b side of the cover portion 85 is a free end, the expansion that has flowed into the inside of the airbag 45 The gas is pressed against the inner peripheral surface side of the inner insertion slit 54 (the inner peripheral surface side of the reinforcing panel 51), and the expansion gas that has flowed into the airbag 45 is the inner insertion slit 54. It is possible to prevent the leakage to the outside through the above, and it is possible to more accurately suppress the leakage of the expansion gas. In particular, in the airbag device of the embodiment, the cover portion 85 extends beyond the inner insertion slit 54 and greatly extends rearward so as to cover the upper side (inside) of the outer insertion slit 53 arranged on the rear side. Therefore, the expansion gas flowing into the inside of the bag body 46 presses the side wall portion 46a of the vehicle body in a wide area, and it is possible to suppress the floating inside the bag body 46 and insert it inside. The inner peripheral side of the slit 65 can be accurately covered. Of course, the cover portion does not have to be extended until it covers the area above the outer insertion slit. Further, if the above points are not taken into consideration, the airbag may be configured so that the inner tube is not arranged, and further, even if the inner tube is provided, the inner tube is not provided with the cover portion. May be.

Furthermore, in the airbag device M of the embodiment, the outer insertion slit 53 and the inner insertion slit 54 are arranged in a region on the rear side of the insertion hole 55 in a state where the bag main body 46 is expanded flat. The outer insertion slit 53 and the inner insertion slit 54 are both arranged in a region on one side (rear side) extending from the insertion hole 55 along the circumferential direction of the inflator main body 31. It is a configuration. Therefore, the strength of the peripheral portion of the insertion hole 55 in the airbag 45 can be ensured as compared with the case where the outer insertion slit and the inner insertion slit are arranged on both sides with the insertion hole in between. If such a point is not taken into consideration, the outer insertion slit and the inner insertion slit may be arranged on both sides with the insertion hole in between.

Furthermore, in the airbag device M of the embodiment, since the inner insertion slit 54 is formed at a position closer to the insertion hole 55 than the outer insertion slit 53, the inflator main body 31 is inserted outside. When the inside is inserted through the inner slit 53 and the inner insertion slit 54, and then the mounting bolt 39 is projected from the insertion hole 55, the arrangement positions of the inner insertion slit and the outer insertion slit are reversed. In comparison, since the mounting bolt 39 of the inflator 30 inserted into the inner insertion slit 54 is arranged in the vicinity of the insertion hole 55, the insertion hole of the mounting bolt 39 after being inserted into the inner insertion slit 54 The work of projecting from 55 becomes easy. If such a point is not taken into consideration, the positions of the inner insertion slit and the outer insertion slit are reversed, and the outer insertion slit is arranged at a position closer to the insertion hole than the inner insertion slit. It may be configured to be made to.

Further, as the airbag 45A, those having the configurations shown in FIGS. 24 to 26 may be used. In this airbag 45A, the insertion opening 49A is configured such that the guide member 110 is arranged between the vehicle body side wall portion 46a as the outer panel material and the reinforcing panel 51A as the inner panel material. Has the same configuration as the above-mentioned airbag 45, and "A" is added to the end of the same reference numeral to the same member, and detailed description thereof will be omitted.

The guide member 110 serves as a guide when the inflator 30 (inflator main body 31) is inserted into the inside, and is composed of a flexible sheet body. In the case of the embodiment, the guide member 110 is the same as the base fabric (material) constituting the airbag 45A, and is a coating agent for preventing gas leakage on the surface of the woven fabric formed by weaving polyamide yarn, polyester yarn, or the like. It is formed from a coated cloth coated with. As shown in FIGS. 25 and 26, the guide member 110 has a rear end 110b side at a portion between the outer insertion slit 53A and the inner insertion slit 54A on the inner peripheral side of the vehicle body side wall portion 46a (vehicle body side wall portion 46a). The rear end 110b is connected (sewn) to the vehicle body side wall portion 46a by a joint portion (sewn portion) 111 formed linearly over substantially the entire left and right sides so as to be arranged (between the reinforcing panel 51A and the reinforcing panel 51A). The front end side portion 110c is arranged so as to cover the inner peripheral side of the reinforcing panel 51A so as to be inserted through the inner insertion slit 54A. Further, an insertion hole 110d is formed in the front end side portion 11c corresponding to the insertion hole 55A. In the case of the embodiment, the guide member 110 is sewn together with the front end 110a together with the leading edge 51a side of the reinforcing panel 51A when the front side central tether 68A is joined (sewn) to the vehicle body side wall portion 46a, and is sewn together with the reinforcing panel 51A side. (See FIG. 25). Further, in the case of the embodiment, the guide member 110 has a substantially rectangular shape with the left-right direction side wide, and the width dimension W5 (see FIG. 24) on the left-right direction side can be inserted into the inner insertion slit 54A. In addition, it is configured to be set slightly smaller than the length dimension of the inner insertion slit 54A.

When the airbag 45A having such a configuration is used, when the inflator 30 (inflator main body 31) is inserted into the inside through the inner insertion slit 54A, the guide member 110 inserted through the inner insertion slit 54A can be inserted. The inflator 30 is connected to the vehicle body side wall portion 46a with the reinforcing panel 51A by the guide member 110 so as to close the gap between the reinforcing panel 51A as the inner panel material and the vehicle body side wall portion 46a as the outer panel material. It is possible to prevent the vehicle from entering the space between the airbags and guide the airbag into the airbag 45A (bag body 46A). Therefore, the inflator 30 (inflator body 31) can be easily inserted into the airbag 45A (bag body 46A).

In the embodiment, the guide member 110 is configured as a substantially rectangular shape in which the width dimension on the left-right direction side is set to be slightly smaller than the length dimension of the inner insertion slit 54A, but the outer shape of the guide member is Not limited to this, if it is possible to suppress erroneous insertion of the inflator, for example, the width dimension in the left-right direction may be smaller than that of the inner insertion slit 54A, and the strip shape may be arranged so as to extend in the front-rear direction. good.

Further, also in the airbag 45A having the above configuration, a flexible lid panel 58A configured to close the outer insertion slit 53A on the outer peripheral side of the vehicle body side wall portion 46a is provided in the insertion opening 49A. The lid panel 58A is arranged so that the rear end 58b side is connected to the vehicle body side wall portion 46a and the reinforcing panel 51A, and the front end 58a side is provided with a mounting bolt 39 corresponding to the insertion hole 55A. The mounting hole 62A for projecting is provided. Therefore, since the outer peripheral side of the outer insertion slit 53A can be covered by the lid panel 58A, the expansion gas that has flowed into the inside of the airbag 45A can be prevented from leaking from the outer insertion slit 53A, and the expansion gas can be prevented. Leakage can be further suppressed.

If such a point is not taken into consideration, as in the airbag 45B shown in FIG. 27, the lid panel 58B is inserted through the outer insertion slit 53B, and the rear end 58b side is the vehicle body side wall portion 46a. It may be configured to be connected to the vehicle body side wall portion 46a and the reinforcing panel 51B in a state of being arranged on the inner peripheral side.

Furthermore, also in the air bag 45A having the above configuration, since the outer insertion slit 53A and the inner insertion slit 54A are arranged so as to be linear and substantially parallel to each other, the outer side is further formed. Compared with the case where the insertion slit and the inner insertion slit are not parallel to each other, the insertion workability of the main body of the inflator is improved.

Furthermore, also in the airbag 45A having the above configuration, the outer insertion slit 53A and the inner insertion slit 54A are formed substantially along the axial direction of the inflator main body 31 and are displaced on the circumferential direction side of the inflator main body 31. It is a configuration that is arranged so as to. Therefore, when the inflator 30 (inflator main body 31) is inserted into the airbag 45A (bag main body 46A), the axial direction is substantially along the outer insertion slit 53A and the inner insertion slit 54A so that the inflator main body 31 Will be inserted into the outer insertion slit 53A and the inner insertion slit 54A while moving. Therefore, even if the inflator 30 is provided with a mounting bolt 39 as a mounting means projecting from the inflator main body 31 in the direction orthogonal to the axis, the mounting bolt 39 has an outer insertion slit 53A and an inner insertion slit. The inflator body 31 can be smoothly inserted into the air bag 45A through the outer insertion slit 53A and the inner insertion slit 54A without easily interfering with the peripheral portion of the 54A. That is, even in the airbag 45A having the above configuration, the inflator main body 31 is inserted into the outer insertion slit 53A and the inner insertion slit 54A, and the mounting bolt 39 protruding from the inflator main body 31 is inserted through the insertion hole 55A. The projecting work can be performed only by moving or rotating the inflator main body 31 in the direction orthogonal to the axis, and the inflator main body 31 is inserted into the outer insertion slit 53A and the inner insertion slit 54A, and the mounting bolt 39. It is possible to easily perform the protrusion from the insertion hole 55A. As a result, the workability of inserting the inflator 30 into the airbag 45A is further improved.

Furthermore, also in the airbag 45A having the above configuration, the outer insertion slit 53A and the inner insertion slit 54A are both arranged in the region behind the insertion hole 55A in a state where the bag body 46A is spread flat. The outer insertion slit 53A and the inner insertion slit 54A are both arranged in a region on one side (rear side) extending from the insertion hole 55A along the circumferential direction of the inflator main body 31. It is a configuration. Therefore, the strength of the peripheral portion of the insertion hole 55 in the airbag 45 can be ensured as compared with the case where the outer insertion slit and the inner insertion slit are arranged on both sides with the insertion hole in between.

If such a point is not taken into consideration, as the airbag 45C, as shown in FIG. 28, the insertion hole 55C is formed in the region between the outer insertion slit 53C and the inner insertion slit 54C. May be used. With such a configuration, the airbag 45C is attached to the body side of the vehicle in a state where the region between the outer insertion slit 53C and the inner insertion slit 54C is pressed by the inflator main body 31. As shown in FIG. 28, even if the configuration is not provided with the lid panel, the leakage of the expansion gas flowing into the inside of the airbag 45C can be accurately suppressed.

The airbag device M of the embodiment is for protecting a pedestrian. Compared to various airbag devices installed in other passenger compartments, the pedestrian airbag device takes a longer time to receive the pedestrian as a protection target after the expansion is completed, and is predetermined after the expansion is completed. Although high internal pressure maintenance performance is required even after the lapse of time, the airbag device M of the embodiment is configured to suppress leakage of expansion gas from the insertion opening 49 for inserting the inflator 30. Has been done. In particular, in the airbag device M of the embodiment, the length dimensions L2 and L3 of the outer insertion slit 53 and the inner insertion slit 54 are both set to be smaller than the length dimension L1 of the inflator main body 31, and further, the outside. The length dimension L3 of the insertion slit 53 is set to be smaller than the length dimension L2 of the inner insertion slit 54, and these length dimensions L2 and L3 are the smoothness of the inflator 30 projecting the mounting bolt 39. It is set as small as possible so as not to interfere with the insertion work. Further, as described above, the three sides of the outer insertion slit 53 arranged on the outer side are covered with the connecting portion 59 that connects the lid panel 58 to the vehicle body side wall portion 46a side, and the inner insertion slit 54 Since the inner peripheral side is covered by the cover portion 85 of the inner tube 80, the expansion gas that has flowed into the bag body 46 leaks to the outside through the inner insertion slit 54 and the outer insertion slit 53. This can be suppressed as much as possible. In addition, in the airbag device M of the embodiment, the mounting piece portion 72 for connecting the side wall portion 46a side of the vehicle body to the bottom wall portion 21 of the case 20 is configured as a separate body from the bag body 46, and this mounting piece portion The mounting bracket 100 is attached to 72, and the mounting bracket 100 for connecting the vehicle body side wall portion 46a side to the case 20 on the body 1 side is not directly attached to the vehicle body side wall portion 46a. Therefore, gas leakage from this portion can also be suppressed. Therefore, in the airbag device M of the embodiment, the airbag 45 can maintain a high internal pressure even after a lapse of a predetermined time from the completion of expansion, and the airbag 45 in a state where the high internal pressure is maintained can accurately drive a pedestrian. Can be taken in.

In the embodiment, an airbag device for pedestrians mounted on the cowl region of the vehicle has been described as an example, but the airbag device of the present invention uses an airbag having a configuration in which an inflator is housed inside. The airbag device is not limited to the pedestrian airbag device, and the present invention can be applied to, for example, a side airbag device mounted on a seat bag of a seat.

1 ... body, 20 ... case, 21 ... bottom wall, 21a ... mounting hole, 30 ... inflator, 31 ... inflator body (main body), 35 ... mounting bracket, 39 ... mounting bolt (mounting means), 42 ... nut, 45, 45A, 45B, 45C, 45D ... Airbag, 46 ... Bag body, 46a ... Body side wall (outer panel material), 46b ... Pedestrian side wall, 49 ... Insertion opening, 51, 51A, 51B, 51D ... Reinforcing panel (inner panel material), 53, 53A, 53B, 53C, 53D ... Outer insertion slit, 54, 54A, 54B, 54C, 54D ... Inner insertion slit, 55 ... Insertion hole, 58, 58A, 58B, 58D ... lid panel, 58a ... front end, 58b ... rear end, 59 ... joint site, 62 ... mounting hole, 80 ... inner tube, 81 ... tube body, 82A, 82B ... outlet, 83 ... insertion hole, 85 ... cover part , 110 ... guide member, 110a ... front end, 110b ... rear end, 111 ... joint site, V ... vehicle, M ... pedestrian airbag device.

Claims (13)

It is configured to include a bag-shaped airbag that expands by inflowing expansion gas into the inside, and an inflator that supplies expansion gas to the airbag.
The inflator
It is provided with a main body portion having a substantially cylindrical outer shape and mounting means for mounting the main body portion on the body side of the vehicle so as to project from the outer peripheral surface of the main body portion in the direction orthogonal to the axis of the main body portion.
An airbag device having a configuration in which the mounting means is projected to the outside and the main body is inserted into the airbag and then mounted on the body side.
The airbag has an insertion opening for inserting the inflator inside.
The region forming the insertion opening in the airbag has a two-layer structure in which an outer panel material and an inner panel material made of a flexible sheet body are laminated.
The insertion opening is formed in the outer panel material and the inner panel material, respectively, and the outer insertion slit and the inner insertion slit for inserting the main body portion, and the outer panel material and the inner panel material are formed. It is configured to include an insertion hole formed so as to penetrate and for projecting the mounting means.
The outer insertion slit and the inner insertion slit are arranged in a non-intersecting state without overlapping each other .
The insertion opening is configured to include a flexible lid panel configured to close the outer insertion slit on the outer peripheral side of the outer panel material.
The lid panel is configured such that one end side is coupled to the outer panel material side and a mounting hole for projecting the mounting means is arranged on the other end side corresponding to the insertion hole. An airbag device characterized by being The airbag device according to claim 1, wherein the outer insertion slit and the inner insertion slit are arranged so as to be linear and substantially parallel to each other. The claim is characterized in that the outer insertion slit and the inner insertion slit are formed substantially along the axial direction of the main body and are arranged so as to be displaced on the circumferential side of the main body. Item 2. The airbag device according to item 2. The inflator is configured to be housed in the airbag by covering the outer peripheral side of the main body with a flexible tubular inner tube.
The inner tube
A tube body that covers the outer peripheral side of the main body and has an outlet that allows the expansion gas discharged from the main body to flow out.
One end side is connected to the tube body, the other end side is a free end, and the tube body is arranged so as to extend from the tube body so that the inner insertion slit formed in the inner panel material can be covered from the inner peripheral side. The cover part that is composed and
The airbag device according to any one of claims 1 to 3 , wherein the airbag device is configured to include. And the outer insertion slit and the inner insertion slit, at one side area extending along the circumferential direction of the main body portion from the insertion hole, together, to claim 1, characterized in that it is provided 4. The airbag device according to any one of 4. The airbag device according to claim 5 , wherein the inner insertion slit is formed at a position closer to the insertion hole than the outer insertion slit. It is configured to include a bag-shaped airbag that expands by inflowing expansion gas into the inside, and an inflator that supplies expansion gas to the airbag.
The inflator
It is provided with a main body portion having a substantially cylindrical outer shape and mounting means for mounting the main body portion on the body side of the vehicle so as to project from the outer peripheral surface of the main body portion in the direction orthogonal to the axis of the main body portion.
An airbag device having a configuration in which the mounting means is projected to the outside and the main body is inserted into the airbag and then mounted on the body side.
The airbag has an insertion opening for inserting the inflator inside.
The region forming the insertion opening in the airbag has a two-layer structure in which an outer panel material and an inner panel material made of a flexible sheet body are laminated.
The insertion opening is formed in the outer panel material and the inner panel material, respectively, and the outer insertion slit and the inner insertion slit for inserting the main body portion, and the outer panel material and the inner panel material are formed. It is configured to include an insertion hole formed so as to penetrate and for projecting the mounting means.
The outer insertion slit and the inner insertion slit are arranged in a non-intersecting state without overlapping each other.
The insertion opening is configured to dispose a guide member that serves as a guide when the inflator is inserted into the inside between the outer panel material and the inner panel material.
The guide member is made of a flexible sheet body, and one end side is placed on the inner peripheral side of the outer panel material at a portion between the outer insertion slit and the inner insertion slit. A configuration in which the region on the other end side is arranged so as to cover the inner peripheral side of the inner panel material by being overlapped with the outer panel material and being inserted through the inner insertion slit. features and to Rue airbag apparatus that is. The insertion opening is configured to include a flexible lid panel configured to close the outer insertion slit on the outer peripheral side of the outer panel material.
The lid panel is configured such that one end side is coupled to the outer panel material side and a mounting hole for projecting the mounting means is arranged on the other end side corresponding to the insertion hole. The airbag device according to claim 7 , wherein the airbag device is provided. The airbag device according to claim 8 , wherein the outer insertion slit and the inner insertion slit are arranged so as to be linear and substantially parallel to each other. Claims wherein the outer insertion slit and the inner insertion slit is formed along substantially the axial direction of the main body portion, characterized in that it is arranged to be shifted in the circumferential direction of the body portion Item 9. The airbag device according to item 9. 7. The airbag device according to item 1. The airbag device according to claim 7 , wherein the insertion hole is formed in a region between the outer insertion slit and the inner insertion slit. And the outer insertion slit and the inner insertion slit, at one side area extending along the circumferential direction of the main body portion from the insertion hole, both 8 through claim, characterized in that it is provided The airbag device according to any one of 11.

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