FRONT AIRBAG DEVICE FOR A VEHICLE

Abstract

Front airbag device (100) for a vehicle, wherein the front airbag device (100) comprises: an airbag cushion (10) designed to expand towards a front-seated occupant (600) by pressure from airbag gas generated by the explosion of a gas generator (40); and a main strap (20) and a retaining strap (30) connected to the airbag cushion (10) to maintain a shape of the expanded airbag cushion (10), wherein the main band (20) and the retaining band (30) are designed as flat bands which are unfolded when the airbag cushion (10) is expanded, and which hold a front surface section (11) of the airbag cushion (10) within a predetermined area, characterized by a wire cutter (70) provided in one side of the gas generator (40); and a ribbon wire (60) that connects the wire cutter (70) to the main band (20), wherein the wire cutter (70) is designed such that, in order to cut the strip wire (60) under control of a vehicle control device (200) in the event of a vehicle collision, it is only activated in a situation in which the front seat (500) is in relaxation mode.

Description

BACKGROUND OF THE INVENTION Area of ​​the invention

[0001] The present invention relates generally to a front airbag device for a vehicle and in particular to a front airbag device for a vehicle, wherein the front airbag device is able to protect an occupant when a front seat is in a normal sitting mode or a relaxation mode. Description of the state of the art

[0002] Recently, the development of autonomous vehicles has led to predictions that vehicle interiors will also change significantly. If autonomous vehicles become a reality, it is expected that one of the most dramatically altered interior elements will be the vehicle seats.

[0003] Conventional vehicle seats can only perform passive movements, such as height adjustment in a fixed position facing the front of the vehicle or backrest angle adjustment. However, when self-driving becomes possible, a driver is no longer needed, enabling a relaxation mode in which an occupant can recline by adjusting the angle of the backrest not only of the front passenger seat and rear seats, but also of the driver's seat.

[0004] The familiar airbag is mounted in front of the occupant and can only protect the front of the occupant in a normal seating position. It cannot protect the front of the occupant in a reclined position, where the occupant leans back by adjusting the seatback angle. Therefore, the airbag mounted in front of the occupant protects the front of the occupant's front surface using a band integrated into the airbag cushion. When the seat reclines, the band within the airbag cushion is cut to increase the airbag's volume and thus protect the front of the occupant's front surface.

[0005] However, the familiar vehicle airbag has a single linear band within the airbag cushion. This means that the front surface of the airbag cushion is not held uniformly and the front of the occupant is not effectively protected in a sideways collision.

[0006] The foregoing serves only to provide background information on the present invention and should not be interpreted as meaning that the present invention falls within the scope of the prior art, which is already known to those skilled in the art. State of the art documents

[0007] KR 10 2007 0 091 111 A

[0008] KR 10 2012 0 020 966 A discloses a front airbag device with the features of the preamble of claim 1. DE 10 2017 221 976 A1 discloses a further front airbag device. OVERVIEW OF THE INVENTION

[0009] Accordingly, the present invention was conceived in light of the aforementioned problems arising in the prior art, and the objective of the present invention is to propose an airbag that is mounted in front of an occupant and expands. According to the present invention, in a vehicle collision, the airbag protects the front surface of the occupant in a normal sitting position in a front seat or in a relaxation position, in which the occupant reclines by adjusting the angle of the front seat backrest, and reduces injuries to the occupant in a vehicle collision when the occupant is in the normal sitting position in the front seat.

[0010] To solve the aforementioned problems, one aspect of the present invention provides a front airbag device for a vehicle. The front airbag device can comprise: an airbag cushion configured to expand towards a front-seated occupant by pressure from airbag gas generated by the explosion of a gas generator; and a main band and a retaining band, which can be connected to the airbag cushion to maintain the shape of the expanded airbag cushion. The main band and the retaining band can be designed as flat bands that unfold when the airbag cushion expands and hold a front surface portion of the airbag cushion within a predetermined area.

[0011] The front airbag device comprises: a wire cutter provided in one side of the gas generator; and a ribbon wire connecting the wire cutter to the main band. The wire cutter can be designed such that, in the event of a vehicle collision, it is only activated, under control by a vehicle control unit, when the front seat is in its relaxed position, thus cutting the ribbon wire.

[0012] The vehicle control unit can determine the relaxation mode of the front seat by receiving a signal from a backrest angle sensor provided in the front seat.

[0013] The main band can be designed to unfold into a triangular shape when the airbag is inflated. The main band can be designed such that one vertex of the triangle is connected to the band wire, and one side of the same triangle, facing the vertex, is connected to the airbag.

[0014] The retaining strap can be designed to unfold into a triangular shape when the airbag is inflated. The retaining strap can be designed such that one vertex of the triangle has a ring through which the strap wire can run, and one side of the ring facing the ring can be connected to the airbag.

[0015] The main band and the retaining band can be designed in such a way that they each unfold into a triangular shape when the airbag cushion expands, one side of the triangular main band and one side of the triangular retaining band can be spaced apart from each other and connected to the airbag cushion by sewing, and one side of the main band and one side of the retaining band can be designed in such a way that they unfold in a vertical direction and a horizontal direction to the airbag cushion.

[0016] The ring of the retaining strap can be designed in such a way that it is moved along the strap wire by an external force acting on the airbag cushion when the airbag cushion is expanded.

[0017] In a situation where the airbag is inflated but the retaining strap is not cut, the front surface section of the airbag can expand with a central projection facing the front-seated occupant, lateral projections on opposite sides, and two recesses connecting the opposing lateral projections to the central projection in a wave-like pattern. The main strap and the retaining strap can each be connected to the two recesses.

[0018] In a head-on collision, the head of a front-seated occupant can be brought into contact with the central projection and then moved to one of the recesses on one side, so that opposite sides of the head are held by the central projection and one of the side projections.

[0019] In a situation of a collision occurring in an oblique direction, the head of the front-seated occupant may be pressed into one of the recesses between the central projection and one of the side projections, the head of the front-seated occupant pressed into the recess may be held by the restraint strap which is unfolded in a plane, and if the head of the front-seated occupant is held by the restraint strap, the restraint strap may absorb the impact as it moves along the strap wire.

[0020] In the situation where the front seat is in relaxation mode, when the airbag cushion is expanded and the strap wire is cut, the front surface section can protrude towards the front-seated occupant, and since the protrusion length of the airbag cushion is increased by the front surface section of the same protruding towards the front-seated occupant, an initial restraint of the front-seated occupant can be reinforced.

[0021] As described above, in the embodiment of the present invention, the airbag cushion 10 is mounted in front of the occupant 600 and is expanded such that it is positioned against a front surface of the occupant 600. The triangular main band 20 and the triangular retaining band 30 are positioned inside the airbag cushion 10, and a side 21 of the main band 20 and a side 31 of the retaining band 30 are spaced apart from each other and are sewn to the airbag cushion 10 to hold the front surface section 11 of the airbag cushion 10.Due to the wave-like shape formed by the recesses 11c of the front surface section 11 connected to the ligaments, the central projection 11a, and the lateral projections 11b of the front surface section 11, in a frontal vehicle collision, the head 610 of the occupant 600 is brought into contact with the central projection 11a of the front surface section 11, and the head 610 of the occupant 600 is rotated and pressed into one of the recesses 11c of the front surface section 11. Accordingly, an impact force on the head 610 is converted into a rotational force when the head 610 is rotated, thus reducing head injuries, which are the most common type of head injury in vehicle collisions.

[0022] Furthermore, the strap wire 60 is connected to a vertex 22 of the main strap 20, and a vertex 32 of the retaining strap 30 is connected to the ring 50 through which the strap wire 60 runs. The structure, in which the ring 50 moves along the strap wire 60, efficiently protects the head 610 of the occupant 600, which is subjected to diagonal left and right forces in a vehicle collision occurring from an oblique direction.

[0023] Furthermore, the wire 60 connecting the main band 20 to the wire cutter 70 is cut by the wire cutter 70 when the front seat 500 is in relaxation mode and the front surface section 11 of the airbag cushion 10 protrudes towards the occupant 600, thus increasing the volume of the airbag cushion 10 to enhance the initial restraint of the front surface of the occupant 600 in relaxation mode. Accordingly, the occupant 600 can be protected effectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above-mentioned and further tasks, features and advantages of the present invention will be better understood with reference to the following detailed description in conjunction with the accompanying drawings. These show: Fig. 1 a perspective view illustrating a front airbag device for a vehicle according to the present invention; Fig. 2 a front view illustrating an airbag cushion of components of the front airbag device for a vehicle according to the present invention; Fig. 3 a perspective view to illustrate a band of components of the front airbag device for a vehicle according to the present invention; Fig. 4 a side view illustrating the front airbag device for a vehicle according to the embodiment of the present invention when the front airbag device is expanded in a normal seating mode of an occupant; Fig. 5 a side view illustrating the front airbag device for a vehicle according to the embodiment of the present invention when the front airbag device is expanded in a relaxation mode of an occupant; Fig. 6 a side section view to illustrate the front airbag device for a vehicle according to the present invention in a frontal collision in the normal seating mode of the occupant; Fig. 7 a side sectional view illustrating the front airbag device for a vehicle according to the present invention in a collision occurring from an oblique direction in the normal seating position of the occupant; and Fig. 8 a perspective view illustrating the front airbag device for a vehicle according to the embodiment of the present invention when the front airbag device is expanded in the occupant's relaxation mode. DETAILED DESCRIPTION OF THE INVENTION

[0025] A front airbag device 100 for a vehicle according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0026] As in Fig. As shown in Figures 1 to 8, the front airbag device 100 for a vehicle is mounted in front of an occupant 600 and is inflated, with an airbag cushion 10 and a strap connected to each other. Furthermore, the front airbag device 100 for a vehicle also comprises a gas generator 40, which is mounted together with the airbag cushion 10, for inflating the airbag cushion 10, a ring 50, a strap wire 60 connected to the strap, and a wire cutter 70 connected to the strap wire 60, which is capable of cutting the strap wire 60 in response to the seating positions of a front seat 500. The airbag cushion 10, the strap, the ring 50, the strap wire 60, the gas generator 40, and the wire cutter 70 are also enclosed in an airbag housing 80.

[0027] In the embodiment according to the present invention, the front airbag device 100 can be used for a vehicle in both an autonomously driving vehicle and a generally manually operated vehicle that is not an autonomously driving vehicle. In the case of the autonomously driving vehicle, since the occupant 600 does not have to drive, the driver's seat of the front seat 500 can be switched to a relaxation mode or a reversing mode in which the front seat faces the rear seat, together with a passenger seat of the front seat 500. Accordingly, the embodiment of the present invention can be mounted on both the driver's seat and the passenger seat of the front seat 500 of the autonomously driving vehicle.In the case of a generally manually operated vehicle, since only one passenger seat of the front seat 500 can switch to relaxation mode, the front airbag device 100 for a vehicle according to the embodiment of the present invention can only be mounted on the passenger seat.

[0028] More precisely, the front airbag device 100 for a vehicle according to the embodiment of the present invention is expanded by pressure from the airbag gas generated when the gas generator 40 explodes, in the direction of the front-seated occupant 600. A main band 20 and a retaining band 30 are connected to the airbag cushion 10 to maintain the shape of the expanded airbag cushion 10. The main band 20 and the retaining band 30 are designed as flat bands that unfold when the airbag cushion 10 expands and hold a front surface section 11 of the airbag cushion 10 by means of a predetermined area.

[0029] Therefore, in a vehicle collision, the airbag cushion 10 expands, preventing forward movement of the occupant's upper body 600 and absorbing the impact. The main strap 20 and the retaining strap 30, mounted within the airbag cushion 10, hold the front surface section 11 of the airbag cushion 10 and are designed to be positioned against the front surface of the occupant 600 when the airbag cushion 10 is inflated. Furthermore, in a vehicle collision, a collision sensor 400 sends a signal to a vehicle control unit 200, and the vehicle control unit 200 sends a signal to the gas generator 40, causing the gas generator 40 to explode and inject the airbag gas into the airbag cushion 10, thus enabling the airbag cushion 10 to expand.

[0030] The wire cutter 70 is installed on one side of the gas generator 40, and the ribbon wire 60 connects the main ribbon 20 to the wire cutter 70.

[0031] Therefore, when the airbag cushion 10 is expanded, the main band 20 is connected to the wire cutter 70 and the band wire 60 and holds the front surface section 11 of the airbag cushion 10, so that the front surface section 11 of the airbag cushion 10 forms a predetermined area.

[0032] The vehicle control unit 200 receives a signal from a backrest angle sensor 300 located in the front seat 500 to determine the relaxation mode of the front seat 500. The wire cutter 70 is activated by the vehicle control unit 200 only in the event of a vehicle collision when the front seat 500 is in relaxation mode, to cut the tape wire 60. Furthermore, in the event of a vehicle collision, the vehicle control unit 200 sends a signal to the wire cutter 70 to cut the tape wire 60 while the airbag cushion 10 is deployed.

[0033] The front seat 500 of the vehicle has a seat cushion 510, which supports the lower body of the occupant 600, and a backrest 520, which supports the upper body of the occupant 600. The backrest 520 can be rotated forwards and backwards relative to the seat cushion 510 by means of a backrest mechanism to adjust its angle, so that the backrest 520 can switch into the relaxation mode.

[0034] According to the embodiment of the present invention, since the front airbag device can be used in both an autonomously driving vehicle and a generally manually operated vehicle that is not an autonomously driving vehicle, the vehicle control device 200 has different criteria for determining the relaxation mode of the front seat 500 when the vehicle is an autonomously driving vehicle or a generally manually operated vehicle.

[0035] In the case of the autonomous vehicle, the occupant 600 presses a seat mode change button to switch the front seat 500 from normal seating mode to relaxation mode. In the case of the generally manually operated vehicle, the occupant 600 in the front passenger seat 500 operates a seat lever or a seat switch on the front passenger seat, so that an angle of the backrest 520 is adjusted and the front passenger seat switches to relaxation mode.

[0036] Therefore, in the autonomous vehicle, the vehicle control unit 200 determines, based on a signal from the seat mode change button, that the front seat 500 has switched to relaxation mode. In the generally manually operated vehicle, the backrest angle sensor 300 provided in the front seat 500 detects the angle of the backrest 520 and inputs the signal into the vehicle control unit 200, and the vehicle control unit 200 determines that the front seat 500 has switched to relaxation mode, thus enabling the vehicle control unit 200 to control the activation of the wire cutter 70 in the event of a vehicle collision.

[0037] If the vehicle control unit 200 determines that the front seat 500 is not in relaxation mode, the vehicle control unit 200 will only activate the gas generator 40 when the collision signal is received from the collision sensor 400.

[0038] When the airbag cushion 10 is expanded, the main band 20 and the retaining band 30 unfold into triangular shapes. A vertex 22 of the triangular main band 20 is connected to the band wire 60, and a side 21 facing the vertex 22 is connected to the airbag cushion 10. A vertex 32 of the triangular retaining band 30 has the ring 50 through which the band wire 60 runs, and a side 31 of the same, facing the ring 50, is connected to the airbag cushion 10. Furthermore, the side 21 of the triangular main band 20 and the side 31 of the triangular retaining band 30 are spaced apart from each other and connected to the airbag cushion 10 by sewing. The side 21 of the main band 20 and the side 31 of the retaining band 30 are unfolded in a vertical direction and a horizontal direction to the airbag cushion 10.

[0039] The sides 21 and 31 of the main band 20 and the retaining band 30, which are designed as flat bands with triangular shapes, are connected in line contact with the front surface section 11 of the airbag cushion 10. Accordingly, the main band 20 and the retaining band 30 of the flat bands can hold the airbag cushion 10 more effectively than if linear bands were connected in point contact with the airbag cushion 10.

[0040] Furthermore, the main strap 20 and the retaining strap 30 are spaced apart from each other and connected in the vertical or horizontal direction to the front surface section 11 of the airbag cushion 10. Accordingly, when the airbag cushion 10 is expanded, the main strap 20 and the retaining strap 30 hold the front surface section 11, so that the front surface section 11 is positioned on the front surface of the occupant 600.

[0041] When the airbag cushion 10 is inflated and the front seat 500 is in its normal seating position, with the retaining strap 60 uncut, the front surface section 11 of the airbag cushion 10 is configured to expand with a central projection 11a extending towards the front-seated occupant 600, lateral projections 11b on opposite sides of the central projection 11a, and two recesses 11c connecting the central projection 11a to the lateral projections 11b in a wave-like pattern. The main strap 20 and the retaining strap 30 are each connected to the two recesses 11c. In a frontal collision, the head 610 of the front-seated occupant 600 is brought into contact with the central projection 11a and then moved to one of the recesses 11c, so that opposite sides of the head 610 are held by the central projection 11a and one of the lateral projections 11b.

[0042] According to Fig. 6 In a frontal collision, in a situation where the front seat 500 is in normal seating mode, the band wire 60 is not cut while the airbag cushion 10 expands, and the sides 21, 31 of the main band 20 and the retaining band 30 hold the recesses 11c of the airbag cushion 10. The front surface section 11 of the airbag cushion 10 and the head 610 of the occupant 600 are brought into contact with each other at the central projection 11a of the front surface section 11, and the head 610 of the occupant 600 is brought into contact with the central projection 11a of the front surface section 11, and the head 610 of the occupant 600 is rotated and pressed into one of the recesses 11c of the front surface section 11, so that an impact force of the head 610 is converted into a rotational force when the head 610 is rotated, thereby a head injury, which is the most common type of injury in vehicle collisions, is reduced.

[0043] Furthermore, when the airbag cushion 10 is expanded, the ring 50 of the retaining strap 30 is designed such that it moves along the strap wire 60 in response to an external force acting on the airbag cushion 10. In an oblique collision, the head 610 of the front-seated occupant 600 is pressed into one of the recesses 11c between the central projection 11a and one of the lateral projections 11b, and the head 610 of the front-seated occupant 600, pressed into the recess 11c, is held by the retaining strap 30, which is unfolded in a plane. When the head 610 of the front-seated occupant 600 is held by the retaining strap 30, the retaining strap 30 absorbs the impact as it moves along the strap wire 60.

[0044] According to Fig. 7 In a side-impact collision, when the front seat 500 is in its normal seating position, the head 610 of the occupant 600 is subjected to diagonal left and right forces, resulting in only weak impact protection. To address this problem, since the ring 50 can move along the band wire 60, the flat band can restrain the head 610 of the occupant 600, preventing it from moving diagonally left and right within the front surface section 11 of the airbag cushion 10. This reduces the risk of head injury to the occupant 600, even in a side-impact collision.

[0045] In a situation where the front seat 500 is in relaxation mode, when the airbag cushion 10 is expanded and the retaining wire 60 is cut, the front surface section 11 protrudes towards the front-seated occupant 600. Because the front surface section 11 protrudes towards the front-seated occupant 600, the protrusion length of the airbag cushion 10 is increased from L1 to L2, thereby reinforcing the initial restraint of the occupant 600.

[0046] According to Fig. 5 and Fig.8 In the situation where the front seat 500 is in relaxation mode, if the band wire 60 is not cut and the airbag cushion 10 is expanded, while the band holds the front surface section 11 of the airbag cushion 10, the airbag cushion 10 is not brought into contact with the front surface of the occupant 600. Therefore, the wire cutter 70 cuts the associated band wire 60 to allow the length of the front surface section 11 of the airbag cushion 10 from L1 to L2 and its volume to increase, thus reinforcing the initial restraint of the front surface of the occupant 600 in relaxation mode and effectively protecting the occupant 600.

[0047] As described above, according to the embodiment of the present invention, the airbag cushion 10 is mounted in front of the occupant 600 and is expanded to be positioned on the front surface of the occupant 600. The triangular main band 20 and the triangular retaining band 30 are positioned inside the airbag cushion 10, and a side 21 of the main band 20 and a side 31 of the retaining band 30 are spaced apart from each other and are connected to the airbag cushion 10 by sewing to hold the front surface section 11 of the airbag cushion 10.Due to the wave-like shape formed by the recesses 11c of the front surface section 11 connected to the ligaments, the central projection 11a, and the lateral projections 11b of the front surface section 11, in a frontal vehicle collision, the head 610 of the occupant 600 is brought into contact with the central projection 11a of the front surface section 11, and the head 610 of the occupant 600 is rotated and pressed into one of the recesses 11c of the front surface section 11. Accordingly, an impact force on the head 610 is converted into a rotational force when the head 610 is rotated, thereby reducing head injuries, which are the most common type of head injury in vehicle collisions.

[0048] Furthermore, the strap wire 60 is connected to the apex 22 of the main strap 20, and the apex 32 of the retaining strap 30 is connected to the ring 50 through which the strap wire 60 runs. The structure, in which the ring 50 moves along the strap wire 60, efficiently protects the head 610 of the occupant 600, which is subjected to diagonal left and right forces in a vehicle collision occurring from an oblique direction.

[0049] Furthermore, the wire 60 connecting the main band 20 to the wire cutter 70 is cut by the wire cutter 70 when the front seat 500 is in relaxation mode. Therefore, the front surface section 11 of the airbag cushion 10 protrudes towards the occupant 600, and the volume of the airbag cushion 10 is increased to reinforce the initial retention of the front surface of the occupant 600 in relaxation mode, thus ensuring efficient protection of the occupant 600.

[0050] Although a preferred embodiment of the present invention has been described for illustrative purposes, those skilled in the field will recognize that various modifications, additions and substitutions are possible without deviating from the scope and content of the present invention as disclosed in the accompanying claims.

Claims

[1] Front airbag device (100) for a vehicle, wherein the front airbag device (100) comprises: an airbag cushion (10) designed to expand towards a front-seated occupant (600) by pressure from airbag gas generated by the explosion of a gas generator (40); and a main strap (20) and a retaining strap (30) connected to the airbag cushion (10) to maintain a shape of the expanded airbag cushion (10), wherein the main band (20) and the retaining band (30) are designed as flat bands which are unfolded when the airbag cushion (10) is expanded, and which hold a front surface section (11) of the airbag cushion (10) within a predetermined area, characterized by a wire cutter (70) provided in one side of the gas generator (40); and a ribbon wire (60) that connects the wire cutter (70) to the main band (20), wherein the wire cutter (70) is designed such that, in order to cut the strip wire (60) under control of a vehicle control device (200) in the event of a vehicle collision, it is only activated in a situation in which the front seat (500) is in relaxation mode. [2] Front airbag device according to claim 1, wherein the vehicle control device (200) determines the relaxation mode of the front seat (500) by receiving a signal from a backrest angle sensor (300) provided in the front seat (500). [3] Front airbag device according to claim 1, wherein the main band (20) is designed such that it unfolds in a triangular shape when the airbag cushion (10) is expanded, wherein the main band (20) is designed such that a vertex (22) of the triangular shape is connected to the band wire (60) and a side of the same, which faces the vertex (22), is connected to the airbag cushion (10). [4] Front airbag device according to claim 1, wherein the retaining strap (30) is designed such that it unfolds in a triangular shape when the airbag cushion (10) is expanded, the retaining strap (30) being designed such that a vertex (32) of the triangular shape has a ring (50) through which the strap wire (60) runs, and a side of the same, which faces the ring (50), is connected to the airbag cushion (10). [5] Front airbag device according to claim 1, wherein the main band (20) and the retaining band (30) are designed such that they each unfold into a triangular shape when the airbag cushion (10) is expanded; one side of the triangular main band (20) and one side of the triangular retaining band (30) are spaced apart from each other and are connected to the airbag cushion (10) by sewing; and one side of the main band (20) and one side of the retaining band (30) are designed such that they are unfolded in a vertical direction and a horizontal direction towards the airbag cushion (10). [6] Front airbag device according to claim 4, wherein the ring (50) of the retaining strap (30) is designed such that it is moved along the strap wire (60) by an external force acting on the airbag cushion (10) when the airbag cushion (10) is expanded. [7] Front airbag device according to claim 1, wherein, in a situation where the airbag cushion (10) is expanded but the webbing wire (60) is not cut, the front surface section (11) of the airbag cushion (10) expands with a central projection (11a) extending towards the front-seated occupant (600), side projections (11b) on opposite sides and two recesses (11c) connecting the opposite side projections (11b) to the central projection (11a) in a wave-like form; and the main webbing (20) and the retaining webbing (30) are each connected to the two recesses (11c). [8] Front airbag device according to claim 7, wherein in a frontal collision the head (610) of a front-seated occupant (600) is brought into contact with the central projection (11a) and is then moved to one of the recesses (11c) on one side, so that opposite sides of the head (610) are held by the central projection (11a) and one of the side projections (11b). [9] Front airbag device according to claim 7, wherein in a situation of a collision occurring in an oblique direction a head (610) of the front seated occupant (600) is pressed into one of the recesses (11c) between the central projection (11a) and one of the side projections (11b); the head (610) of the front-seated occupant (600), pressed into the recess (11c), is held by the retaining strap (30) which is unfolded in a plane; and when the head (610) of the front-seated occupant (600) is held by the retaining strap (30), the retaining strap (30) absorbs the shock as it moves along the strap wire (60). [10] Front airbag device according to claim 1, wherein, in the situation in which the front seat (500) is in relaxation mode, when the airbag cushion (10) is expanded and the band wire (60) is cut, the front surface section (11) protrudes towards the front occupant (600); and since a protrusion length of the airbag cushion (10) is increased by the front surface section (11) of the same protruding towards the front occupant (600), an initial restraint of the front occupant (600) is enhanced.

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