JP2014121966A - Air bag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily form a small corner part at an expansion part between a windshield of an air bag and upper surface part of an instrument panel.SOLUTION: An inflator 2 supplies an air bag 10 with gas. The air bag 10 is constituted of first to third base fabrics 13 to 15 and expands with gas between a windshield 81 and a crew 90. The cylindrical first base fabric 13 projects from the instrument panel 82 to the crew 90. The second base fabric 14 is jointed to one end part of the first base fabric 13 so as to close an opening on the one end part. The third base fabric 15 is jointed to the other end part of the first base fabric 13 so as to close an opening on the other end part. The expanded air bag 10 comprises a corner part 24 formed between the windshield 81 and the upper surface part 82A of the instrument panel 82 by jointing the first base fabric 13 and the second base fabric 14.

Description

  The present invention relates to an airbag device that protects an occupant with an airbag in a vehicle.

  An air bag device is installed on the instrument panel in order to protect passengers in the event of a vehicle emergency. When the airbag device is activated, the airbag is generally inflated and deployed by the gas supplied from the inflator, and the occupant enters the inflated airbag. Further, the airbag absorbs energy while being deformed, and the occupant is received by the airbag. When the occupant enters, it is necessary to prevent the occupant from contacting the instrument panel and to restrain the occupant with an airbag. On the other hand, conventionally, an airbag apparatus including an airbag formed in a shape capable of restraining an occupant by three joined panels is known (see Patent Document 1).

  In the airbag device described in Patent Document 1, the airbag is composed of a peripheral panel facing the occupant and a pair of side panels joined to both side portions of the peripheral panel, and the instrument panel is folded. Installed. The occupant comes into contact with the peripheral panel that extends along the instrument panel and is received by the airbag.

  However, in this conventional airbag, the peripheral panel is inflated so as to approach a round shape due to the tension acting on the peripheral panel, and therefore it is difficult to form a small corner in a part of the peripheral panel. Therefore, there is a tendency that the airbag is greatly inflated between the windshield and the upper surface portion of the instrument panel, and the gap between the airbag and the instrument panel is increased. Depending on the size of the gap, the airbag is likely to move, which may affect the stability of the behavior of the airbag.

JP 2012-66613 A

  The present invention has been made in view of the above-described conventional problems, and its purpose is to make it possible to easily form a small corner portion in a portion that is inflated between the windshield of the airbag and the upper surface portion of the instrument panel. It is to stabilize the behavior of the airbag.

  The present invention is an airbag device including an airbag installed on an instrument panel and inflated by gas between a windshield and an occupant, and an inflator for supplying gas into the airbag. A cylindrical first base fabric projecting from the instrument panel toward the occupant when the airbag is inflated, and a second base joined to one end portion of the first base fabric on the instrument panel side and closing the opening of the one end portion The inflated airbag joins the first base fabric and the second base fabric, and is composed of a fabric and a third base fabric that is joined to the other end portion of the first base fabric on the passenger side and closes the opening of the other end portion. Thus, the airbag device has a corner portion formed between the windshield and the upper surface portion of the instrument panel.

  According to the present invention, a small corner portion can be easily formed in a portion that is inflated between the windshield of the airbag and the upper surface portion of the instrument panel, and the behavior of the airbag can be stabilized.

It is a side view of the airbag apparatus of this embodiment. It is an expanded view of the airbag before formation. It is a perspective view of the airbag in the middle of formation. It is a perspective view of the air bag after formation. It is the figure which expanded the W section of FIG. It is a figure which shows the behavior of the airbag at the time of inflation deployment. It is a figure which shows the behavior of the airbag at the time of a passenger | crew's invasion.

An embodiment of an airbag device of the present invention will be described with reference to the drawings.
The airbag device of this embodiment is an occupant protection device that protects a vehicle occupant with an airbag, and is installed in an instrument panel of various vehicles. Hereinafter, the airbag device will be described by taking the passenger seat airbag device as an example.

FIG. 1 is a side view of the airbag apparatus 1 according to the present embodiment, and schematically shows the airbag 10 inflated in the vehicle 80. In FIG. 1, a part of the vehicle 80 and the occupant 90 are shown as viewed from the width direction of the vehicle 80, and the vehicle 80 is shown in a cross-sectional view.
In the present embodiment, front, rear, upper, and lower refer to front, rear, upper, and lower in the vehicle 80.

  As illustrated, the vehicle 80 includes a windshield 81, an instrument panel 82 positioned below the windshield 81, and a housing portion 83 of the airbag device 1. The instrument panel 82 is a vehicle member on which the airbag apparatus 1 is installed, and is disposed in front of the occupant 90 in the vehicle 80. The accommodating portion 83 is formed on the upper surface portion 82 </ b> A of the instrument panel 82. The airbag device 1 before operation is accommodated in the accommodating portion 83 and installed on the instrument panel 82 (upper surface portion 82A) of the vehicle 80. Moreover, the airbag apparatus 1 in the accommodating part 83 is covered with an airbag cover (not shown).

  The airbag device 1 includes an airbag 10 that is inflated by gas between a windshield 81 and an occupant 90, and an inflator 2 that generates gas. The airbag 10 has an attachment portion 11 for the inflator 2 and is accommodated in the accommodation portion 83 together with the inflator 2 in a folded state. The inflator 2 is attached to the attachment portion 11 of the airbag 10, and the inflator 2 and the attachment portion 11 are fixed to the instrument panel 82. Thereby, the airbag 10 and the inflator 2 are installed on the instrument panel 82.

  In the event of a vehicle emergency, the inflator 2 operates in response to an operation instruction signal received from an instruction device (not shown) of the vehicle 80. The inflator 2 generates gas in the airbag 10 and supplies the gas into the airbag 10. The airbag 10 is deployed by the gas supplied from the inflator 2 and jumps out of the instrument panel 82 (accommodating portion 83) into the vehicle 80.

  Subsequently, the airbag 10 projects toward the occupant 90 and inflates in front of the occupant 90 while being in contact with a part of the instrument panel 82. As a result, the airbag 10 is inflated and deployed between the instrument panel 82 and the occupant 90. The occupant 90 (here, mainly the head 91) enters the inflated airbag 10, and is received and protected by the airbag 10. At that time, the gas in the airbag 10 is discharged from the vent hole 12 of the airbag 10 to the side, so that the impact of the occupant 90 is reduced.

  The airbag 10 of the present embodiment is formed in a shape that protrudes from the instrument panel 82 toward the occupant 90 in an inflated state. The airbag 10 is inflated and deployed from the instrument panel 82 toward the occupant 90 and inflated into a predetermined shape in the vehicle 80.

  The airbag 10 includes an inflating portion 20 that is inflated by gas and a front inflating portion 21 that is a part of the inflating portion 20. The attachment portion 11 of the inflator 2 is formed at the base end portion 22 (end portion on the instrument panel 82 side) of the airbag 10 (inflatable portion 20), and is positioned above the base end portion 22. Accordingly, the inflator 2 is attached to the base end portion 22 of the airbag 10 and is fixed to the instrument panel 82 together with the upper portion of the base end portion 22. When the airbag 10 is inflated and deployed, the base end portion 22 is in contact with the instrument panel 82 and is held by the instrument panel 82 at the position of the inflator 2. Further, the front end portion 23 of the airbag 10 on the occupant 90 side is disposed in front of the occupant 90 and faces the occupant 90.

  The front inflating part 21 of the airbag 10 is a front part of the airbag 10 (inflating part 20), and inflates in a space between the windshield 81 and the upper surface part 82A of the instrument panel 82. The inflated airbag 10 has a corner 24 at the front end of the front inflating portion 21. The corner portion 24 of the airbag 10 is an edge inflating portion formed at the front end portion of the airbag 10 and inflates on the front side (windshield 81 side) of the attachment portion 11 (accommodating portion 83). As the airbag 10 is inflated, the corner portion 24 inflates forward along the upper surface portion 82 </ b> A of the instrument panel 82.

Next, a procedure for forming the airbag 10 will be described.
FIG. 2 is a development view of the airbag 10 before formation, and shows three base fabrics (panels) 13 to 15 of the airbag 10. FIG. 3 is a perspective view of the airbag 10 being formed, and FIG. 4A is a perspective view of the airbag 10 after formation. 4B is a perspective view of the airbag 10 as viewed from the direction of the arrow X in FIG. 4A and shows the airbag 10 as viewed from the passenger 90. FIG.

  As shown in the figure, the airbag 10 is composed of first to third base fabrics (base fabric members) 13 to 15 each having a predetermined shape, and the bag is formed by the joined first to third base fabrics 13 to 15. Formed in the body. The 1st base fabric 13 is a side surface base fabric of the airbag 10, and becomes the side surface (circumferential surface) of the airbag 10 expanded in a cylindrical shape. The first base fabric 13 is made of a single base fabric (base fabric material), and the left and right edge portions 13A and 13B formed in a straight line and the upper and lower edge portions 13C and 13D formed in a curved shape. Have Note that the shapes of the upper and lower edges 13C and 13D are changed in accordance with the shape of the airbag 10, and are formed in various shapes.

  When the airbag 10 is formed, first, the left and right edges 13A, 13B of the first base fabric 13 are overlapped, and the pair of edges 13A, 13B are joined airtightly by sewing. Thereby, the joining part 13E of the edge parts 13A and 13B is formed on the first base cloth 13, and the first base cloth 13 is formed in a cylindrical shape. When the airbag 10 is inflated, the first base fabric 13 projects from the instrument panel 82 toward the occupant 90 and expands into a cylindrical shape. Thus, the 1st base fabric 13 is a cylindrical base fabric formed in the shape of a cylinder, and has an opening at one end 13F on the instrument panel 82 side and the other end 13G on the occupant 90 side.

  The second base fabric 14 and the third base fabric 15 are respectively joined to the annular end portions 13F and 13G of the first base fabric 13 to form both end surfaces (base end surface and front end surface) of the airbag 10. In that case, the edge part of the 2nd base cloth 14 and the 3rd base cloth 15 is joined airtightly to the edge part of the edge parts 13F and 13G by sewing. The second base fabric 14 is an instrument panel side base fabric of the airbag 10 and is located on the instrument panel 82 side when the airbag 10 is inflated. Further, the second base fabric 14 has an attachment portion 11 for the inflator 2. The attachment portion 11 is formed of an attachment hole having a circular hole, and is formed at the center portion in the width direction of the second base fabric 14. The inflator 2 is inserted into the attachment portion 11 and attached to the attachment portion 11 and the second base fabric 14.

  The second base fabric 14 is formed in a strip shape having gently curved edges, and the third base fabric 15 is formed in a strip shape having curved both ends. After the first base fabric 13 is formed into a cylindrical shape, the second base fabric 14 is joined to the one end portion 13F of the first base fabric 13 and closes the opening of the one end portion 13F. The third base fabric 15 is joined to the second base fabric 14 at the other end portion 13G of the first base fabric 13 and closes the opening of the other end portion 13G. The third base fabric 15 is an occupant side base fabric of the airbag 10, and is located on the occupant 90 side and faces the occupant 90 when the airbag 10 is inflated.

  The end portions 13F and 13G of the first base fabric 13 are joined to a second base fabric 14 that is a first end surface (bottom surface) base fabric and a third base fabric 15 that is a second end surface (tip surface) base fabric. Thus, a shape corresponding to the shape of each of the base fabrics 14 and 15 is formed. Thereby, the airbag 10 is formed in a predetermined shape. When the airbag 10 is inflated, the longitudinal direction of the second base fabric 14 is arranged in a direction perpendicular to the width direction of the vehicle 80, and the second base fabric 14 contacts the instrument panel 82. Moreover, the front expansion | swelling part 21 and the corner | angular part 24 of the airbag 10 are formed of the joined 1st base fabric 13 and 2nd base fabric 14 (refer FIG. 4A and FIG. 1).

FIG. 5 is an enlarged view of a portion W in FIG.
The front inflating portion 21 and the corner portion 24 of the airbag 10 are joined between the windshield 81 and the upper surface portion 82A of the instrument panel 82 by joining the first base fabric 13 and the second base fabric 14 as shown in the figure. Formed. Further, in a state where the airbag 10 is inflated, the joint portion 16 between the first base fabric 13 and the second base fabric 14 is located at the corner portion 24 of the airbag 10.

  The joint portion 16 is a portion where the one end portion 13F of the first base fabric 13 and the edge portion of the second base fabric 14 are joined. When the front inflating portion 21 and the corner portion 24 are inflated between the windshield 81 and the upper surface portion 82A of the instrument panel 82, a part (front end portion) of the joint portion 16 is located at the corner portion 24 of the airbag 10. . The shape of the corner portion 24 is defined by the first base fabric 13, the second base fabric 14, and the joint portion 16, and the corner portion 24 expands so as to be bent at the joint portion 16. Moreover, the front expansion part 21 expand | swells so that it may become narrow gradually toward the corner | angular part 24, and the corner | angular part 24 containing the junction part 16 expand | swells so that it may protrude. Thereby, the front expansion part 21 and the corner | angular part 24 expand | swell to a predetermined shape, and the corner | angular part 24 is arrange | positioned in the predetermined position between the windshield 81 and the instrument panel 82. FIG.

  The joint 16 between the first base fabric 13 and the second base fabric 14 is located at the tip of the corner 24 of the airbag 10 or around the tip. Here, the joint portion 16 is positioned at the tip of the corner portion 24, and the corner portion 24 is formed in an acute angle shape with the joint portion 16 as the tip in the cross section of the corner portion 24 as viewed from the side. The corner portion 24 is disposed along the upper surface portion 82A on the windshield 81 side, and the joint portion 16 is disposed in the vicinity of the upper surface portion 82A.

  After the formation of the airbag 10, the airbag 10 is folded in accordance with the size of the accommodating portion 83 (see FIG. 1) and accommodated in the accommodating portion 83 together with the inflator 2. In the present embodiment, the airbag 10 is folded so that the gas supplied from the inflator 2 does not directly hit the joint portion 13E of the first base fabric 13 in the initial stage of inflation of the airbag 10. The airbag 10 is folded so that the joint portion 13E does not hit the gas supply portion of the inflator 2. Thereby, the joining part 13E is arrange | positioned in the position which the gas supplied from the inflator 2 does not hit directly in the folded airbag 10 before expansion | swelling.

  The folded airbag 10 is attached to the accommodating portion 83 together with the inflator 2, and the airbag device 1 is installed on the instrument panel 82. When the airbag 10 is inflated and deployed, the inflation of the airbag 10 is started by the gas generated by the inflator 2, and the airbag 10 is deployed while sequentially unfolding the folded shape.

FIG. 6 is a diagram illustrating the behavior of the airbag 10 during inflation and deployment, and FIG. 7 is a diagram illustrating the behavior of the airbag 10 when the occupant 90 enters. 6 and 7 show the airbag 10, the vehicle 80, and the occupant 90 in the same manner as in FIG.
As shown in the figure, when the airbag 10 is inflated and deployed, first, the airbag 10 jumps out of the instrument panel 82 into the vehicle 80 (see FIG. 6A).

  Subsequently, the airbag 10 is deployed along the instrument panel 82 so as to cover a part of the instrument panel 82 while being inflated (see FIG. 6B). As the gas is supplied, the airbag 10 expands in a cylindrical shape from the instrument panel 82 toward the occupant 90 (see FIG. 6C). When the airbag 10 is inflated, the first base fabric 13 is deployed in a cylindrical shape along the windshield 81 and is deployed at a position away from the windshield 81. Further, the front inflating portion 21 of the airbag 10 is inflated at the front portion of the airbag 10 located between the windshield 81 and the upper surface portion 82A of the instrument panel 82. The corner portion 24 of the airbag 10 projects forward at the front end portion of the airbag 10 and expands between the windshield 81 and the upper surface portion 82A of the instrument panel 82.

  The airbag 10 protrudes from the instrument panel 82 and is completely inflated in front of the occupant 90. The airbag 10 is inflated and deployed in a space between the windshield 81, the instrument panel 82, and the occupant 90. At that time, the base end portion 22 of the airbag 10 is mainly deployed closer to the occupant 90 side than the attachment portion 11 (accommodating portion 83), and contacts the surface of the instrument panel 82 on the occupant 90 side. The airbag 10 is inflated to protect the occupant 90 in the vehicle 80 and is disposed at a predetermined position in front of the occupant 90.

  The occupant 90 moves toward the inflated airbag 10 and contacts the distal end portion 23 of the airbag 10 (see FIG. 7A). Due to the force received from the occupant 90 (here, the head 91), the airbag 10 is compressed and crushed in the intrusion direction of the occupant 90 (see FIG. 7B). Thus, the airbag 10 is deformed in the intrusion direction and deformed outward (here, a direction orthogonal to the intrusion direction including the side and the vertical direction). Further, the distal end portion 23 of the airbag 10 is deformed so as to be recessed according to the shape of the occupant 90, and the proximal end portion 22 of the airbag 10 is pressed against the instrument panel 82.

  As the occupant 90 enters the inflated airbag 10, the airbag 10 is deformed so as to be crushed toward the instrument panel 82 (see FIG. 7C). The airbag 10 absorbs the energy of the occupant 90 while being deformed, and stops the movement of the occupant 90. The occupant 90 is received by the airbag 10 without completely crushing the airbag 10. In addition, the occupant 90 is restrained by the airbag 10 without contacting the instrument panel 82.

  As described above, in the present embodiment, the portion that expands between the windshield 81 of the airbag 10 and the upper surface portion 82A of the instrument panel 82 by joining the first base fabric 13 and the second base fabric 14. In addition, the small corner portion 24 can be easily formed.

  Along with the formation of the corner portion 24, the airbag 10 can be prevented from being greatly inflated between the windshield 81 and the upper surface portion 82A of the instrument panel 82. Moreover, the clearance gap between the airbag 10 and the instrument panel 82 can be made small. As a result, unnecessary movement of the airbag 10 is suppressed, so that the behavior of the airbag 10 can be stabilized. Therefore, the stability of the airbag 10 can be improved not only when the airbag 10 is inflated but also when the occupant 90 enters the airbag 10. Since the corner | angular part 24 can be formed easily at the time of manufacture of the airbag 10, it can also prevent that the productivity of the airbag 10 falls.

  The joint portion 16 between the first base fabric 13 and the second base fabric 14 may be located at the tip of the corner portion 24, or may be located at a location off the tip of the corner portion 24. In this manner, by forming the joint portion 16 at the corner portion 24, the corner portion 24 can be reduced, and the acute corner portion 24 can be easily formed in the airbag 10. Further, the expansion shape of the corner portion 24 can be defined by the joint portion 16 located at the corner portion 24. When the joint portion 16 is located at the tip of the corner portion 24, the corner portion 24 of the airbag 10 can be made smaller because the corner portion 24 is formed in a tapered shape.

  In addition, in the present embodiment, when the airbag 10 is inflated, the tubular first base fabric 13 projects from the instrument panel 82 toward the occupant 90 in a tubular shape. Since the side surface (circumferential surface) of the airbag 10 is formed of the cylindrical first base cloth 13, the airbag 10 is difficult to expand outward, and the outward deformation of the airbag 10 is suppressed. Further, the deformation of the airbag 10 due to the intrusion of the occupant 90 is suppressed, and the airbag 10 is difficult to be crushed. Therefore, the energy absorption efficiency by the airbag 10 can be increased, and the occupant 90 can be effectively restrained. It is also possible to reduce the amount of movement of the occupant 90 from when the occupant 90 comes into contact with the airbag 10 until it stops. Accordingly, even if the airbag 10 is made smaller, contact between the occupant 90 and the instrument panel 82 can be prevented, so that the capacity of the airbag 10 can be reduced.

  By reducing the capacity of the airbag 10, the inflator 2 can be changed to a low-power inflator 2 with a small amount of gas generation. Thereby, the inflator 2 can be reduced in size and weight. Further, according to the airbag 10 of the present embodiment, the occupant 90 can be protected in the same area as the conventional airbag even if the capacity is reduced as compared with the conventional airbag.

  When the cylindrical first base fabric 13 is deployed along the windshield 81, the expansion of the first base fabric 13 toward the windshield 81 is suppressed. At the same time, the position and the deployment direction of the first base fabric 13 are regulated by the corner portion 24 on the windshield 81 side, and the first base fabric 13 is deployed in a direction corresponding to the direction at the corner portion 24. As a result, the portion of the first base fabric 13 that faces the windshield 81 is developed into a predetermined shape and disposed at a predetermined position.

  Thereby, for example, since the first base fabric 13 can be prevented from hitting the windshield 81, the airbag 10 can be stably deployed. Further, when the first base fabric 13 is brought into contact with the windshield 81, a wide portion of the first base fabric 13 facing the windshield 81 can be brought into contact with the windshield 81. Thus, since the contact part of the 1st base fabric 13 can be enlarged, the airbag 10 can be reliably supported by the windshield 81, and the behavior of the airbag 10 can be stabilized. Since it is possible to secure a sufficient contact portion of the first base fabric 13 without the need to greatly inflate the airbag 10 to the side, an increase in the capacity of the airbag 10 can be prevented.

  By changing the shapes of the first base fabric 13 and the second base fabric 14 in the joint portion 16, the shape and angle of the corner portion 24 can be changed. Thereby, the shape and angle of the corner portion 24 can be adjusted to a shape that matches the space between the windshield 81 and the upper surface portion 82A of the instrument panel 82. By setting the shape and angle of the corner portion 24 so as to correspond to the inclination of the windshield 81 for each vehicle, the first base fabric 13 can be deployed in accordance with the inclination of each windshield 81. Moreover, the expansion | swelling shape of the airbag 10 can be adjusted by changing the shape of the 1st base fabric 13. FIG.

  In order to join the pair of edge portions 13A and 13B of one base fabric to form the first base fabric 13 into a cylindrical shape (see FIGS. 2 and 3), the cylindrical first base fabric 13 can be easily formed. Can be formed. The joint portion 13 </ b> E of the first base fabric 13 is disposed at an arbitrary position of the airbag 10. However, in the folded airbag 10 before the inflation, the joint portion 13E is disposed at a position out of the position where the airbag 10 is easily damaged, so that the joint portion 13E is damaged at the initial stage of the inflation of the airbag 10. Can be suppressed.

  The position where the airbag 10 is easily damaged is, for example, a position that is affected by high-temperature gas. Therefore, it is preferable to arrange | position the junction part 13E in the position which the gas supplied from the inflator 2 does not hit directly in the folded airbag 10. FIG. By doing in this way, before the airbag 10 is inflated and when gas is first supplied to the folded airbag 10 (at the initial stage of gas supply by the inflator 2), the joint 13E directly receives the gas. It is arranged at a position where it does not hit. As a result, it is possible to reduce the influence of the heat of the gas on the joint portion 13E and suppress the breakage of the joint portion 13E.

  In the present embodiment, the cylindrical first base cloth 13 is formed by bonding one base cloth, but the cylindrical first base cloth 13 is formed by bonding a plurality of base cloths. May be. You may form the 1st base fabric 13 with the cylindrical base fabric without a junction part. Similarly, the second and third base fabrics 14 and 15 may be formed by a single base fabric, or may be formed by joining a plurality of base fabrics. The base fabrics used for forming the first to third base fabrics 13 to 15 are base fabric materials (here, cut base fabrics) that are the basis of the first to third base fabrics 13 to 15, and are respectively predetermined. It is formed into a shape. You may form a penetration part (a hole, a slit, etc.) in the 2nd, 3rd base fabrics 14 and 15 as needed. In this case, the inside (air chamber) of the airbag 10 is the second and third base fabrics with the second and third base fabrics 14 and 15 closing the openings of the cylindrical first base fabric 13. It connects with the outside through the penetration part of 14 and 15.

  In the airbag apparatus 1 of the present embodiment, the airbag 10 is installed on the upper surface portion 82A of the instrument panel 82, but the airbag 10 is a portion other than the upper surface portion 82A of the instrument panel 82 (intermediate portion, lower portion, etc.). You may make it install in. Further, the present invention can be applied to an airbag apparatus including the airbag 10 installed on the instrument panel 82 regardless of the type of the airbag apparatus.

  DESCRIPTION OF SYMBOLS 1 ... Airbag apparatus, 2 ... Inflator, 10 ... Airbag, 11 ... Attachment part, 12 ... Vent hole, 13 ... 1st base fabric, 13E ... Joint part 14 ... 2nd base fabric, 15 ... 3rd base fabric, 16 ... Joint part, 20 ... Expansion part, 21 ... Front expansion part, 22 ... Base end part, 23 ... tip part, 24 ... corner part, 80 ... vehicle, 81 ... windshield, 82 ... instrument panel, 82A ... upper surface part, 83 ... housing part, 90 ..Crew, 91 ... head.

Claims (5)

An airbag device including an airbag installed on an instrument panel and inflated with gas between a windshield and an occupant, and an inflator for supplying gas into the airbag,
The airbag is joined to the tubular first base fabric projecting from the instrument panel toward the occupant when the airbag is inflated, and one end portion of the first base fabric on the instrument panel side to block the opening of the one end portion. A second base fabric and a third base fabric that is joined to the other end of the first base fabric on the passenger side and closes the opening of the other end;
An airbag device in which an inflated airbag has a corner portion formed between a windshield and an upper surface portion of an instrument panel by joining a first base fabric and a second base fabric. In the airbag apparatus described in Claim 1,
The airbag apparatus in which the junction part of a 1st base fabric and a 2nd base fabric is located in the front-end | tip of the corner | angular part of an airbag. In the airbag apparatus described in Claim 1 or 2,
An airbag device in which the first base fabric is deployed along the windshield when the airbag is inflated. In the airbag apparatus as described in any one of Claim 1 thru | or 3,
An airbag device in which a first base fabric is formed into a cylindrical shape by joining a pair of edges of one base fabric. In the airbag apparatus described in Claim 4,
The airbag apparatus arrange | positioned in the position which the junction part of a pair of edge part of a 1st base fabric does not hit directly the gas supplied from an inflator in the folded airbag before expansion | swelling.

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