KNEE AIRBAG DEVICE

Abstract

Knee airbag device comprising: a housing part (110) designed such that one side of the same is open; a cover part (120) installed such that it covers the open section of the housing part (110); a cushion part (130) which is received in a folded state in the housing part (110) and is connected to a gas generator (101);and a flap part (140, 150) installed such that it surrounds the folded cushion part (130) on one side of the cover part (120) and blocks a gap between the housing part (110) and a lower plate (10) of a vehicle, in order to essentially prevent the cushion part (130) from getting caught on the lower plate (10) when the cushion part (130) is unfolded, characterized in that the flap part (140, 150) is provided with a tear line (145, 155) which divides the flap part (140, 150) into a plurality of flap parts (140, 150), and the tear line (145, 155) is formed on the flap part (140, 150) such that it extends in a direction away from the lower plate (10) relative to a center of the cover part (120). is pre-tensioned.;

Description

CROSS-REFERENCE TO RELATED REGISTRATION

[0001] Pursuant to Section 35 USC § 119(a), the present application claims priority from Korean patent application number 10-2019-0011757, filed on January 30, 2019 with the Korean Intellectual Property Office, which is hereby incorporated in its entirety by reference into the present application. BACKGROUND Technical area

[0002] Embodiments of the present disclosure relate to a knee airbag device and in particular a knee airbag device which is able to substantially prevent a cushion part from getting stuck in a gap between a housing part and a lower plate when the cushion part is deployed, or from getting stuck on the lower plate. State of the art

[0003] Generally, a vehicle is equipped with a knee airbag that protects the lower body of an occupant. The knee airbag is located under a lower panel facing the occupant's knee. A cushion portion of the knee airbag is packed in a folded state within a housing, and a cover is installed to close an opening in the housing.

[0004] When gas is supplied to the cushion section, it inflates and unfolds. As the inflation pressure of the cushion section breaks a dividing line, the cover section opens while rotating within the housing section. When the cover section opens, the cushion section unfolds upwards from the underside of the lower plate.

[0005] In the prior art, however, if the lower end of the lower plate is installed at a lower point than the lower side of the housing part, the cushion part may get stuck on or interfere with the lower end of the lower plate when unfolding. Therefore, the unfolding direction of the cushion part may be deflected, or the cushion part may not unfold completely.

[0006] Furthermore, if the lower end of the bottom plate is installed at a higher point than the bottom of the housing part, the cushion part may get stuck in a gap between the bottom plate and the housing part when unfolding upwards. Therefore, the cushion part can unfold between the bottom plate and the housing part. OVERVIEW

[0007] Various embodiments relate to the provision of a knee airbag device that is capable of essentially preventing a cushion part from becoming stuck in a gap between a housing part and a lower plate, or from becoming stuck on the lower plate, when the cushion part is deployed.

[0008] In one embodiment, a knee airbag device comprises: a housing part designed such that one side of the same is open; a cover part installed such that it covers the open section of the housing part; a cushion part which, in a folded state, is received in the housing part and is connected to a gas generator; and a flap part installed such that it surrounds the folded cushion part on one side of the cover part and blocks a gap between the housing part and a lower plate of a vehicle, in order to essentially prevent the cushion part from becoming caught on the lower plate when the cushion part is deployed.

[0009] In the present disclosure, the flap part can be provided with a tear line that divides the flap part into a plurality of flap parts, and the tear line can be formed on the flap part in such a way that it is prestressed relative to a center of the cover part in a direction away from the lower plate.

[0010] In the present disclosure, the flap part can be provided with a tear line that divides the flap part into a plurality of flap parts, and the tear line can be formed on the flap part in such a way that it is prestressed relative to a center of the cover part in an unfolding direction of the cushion part towards an opposite side.

[0011] In the present disclosure, one side of the flap part can be connected to the cushion part or a bracket part, and the other side of the flap part can be latched to a hook section of the housing part.

[0012] In the present disclosure, the flap part may comprise: a flap body connected to the bracket part or the cushion part and installed in such a way as to surround the folded cushion part; and a latching section extending from the other side of the flap body to latch with the hook section and provided with the tear line.

[0013] In the present disclosure, the flap part can comprise: a first flap section installed in such a way that it surrounds the folded cushion part on the side of the cover part and is provided with a tear line; and a second flap section arranged in such a way that it overlaps the first flap section.

[0014] In the present disclosure, the tear line can divide the first flap section into a plurality of first flap sections and can be formed on the first flap section in order to be prestressed in a direction closer to the lower plate relative to a center of the cover part.

[0015] In the present disclosure, the tear line can divide the first flap section into a plurality of first flap sections and can be formed on the first flap section in order to be prestressed relative to a center of the cover part in an unfolding direction of the cushion part.

[0016] In the present disclosure, one side of the first flap section may be connected to the cushion part or the iron part, and the other side may be latched to the hook section of the housing part; the second flap section may be connected to the first flap section via a first sewn part and a second sewn part, and the second sewn part may be torn open when the cushion part is inflated.

[0017] In the present disclosure, the first sewn part can be formed at a location closer to the lower plate than the tear line, and the second sewn part can be formed at a location farther from the lower plate than the tear line.

[0018] In the present disclosure, the first valve section may comprise: a first valve body, one side of which is connected to the cushion part or the stirrup part and which is provided with the tear line; and a first detent section extending from the other side of the first valve body to be detented with the hook section.

[0019] In the present disclosure, the flap part can be folded over to cover the iron part, an upper side of the cushion part can be folded in a zigzag pattern, a lower side of the cushion part can be folded into a roll, and both sides of the cushion part can be folded in a zigzag pattern.

[0020] In the present disclosure, when the cushion part is unfolded, the flap part is folded over to block a gap between the housing part and the lower plate, thereby making it possible to essentially prevent the cushion part from getting caught on or interfering with a lower end of the lower plate.

[0021] Furthermore, in the present disclosure, the gap between the housing part and the lower plate is blocked by the flap part, making it possible to essentially prevent the cushion part from unfolding in the lower plate. List of characters Fig. Figure 1 is a top view showing a state in which a cushion part and a flap part are unfolded in a knee airbag device according to a first embodiment of the present disclosure. Fig. Figure 2 is a sectional view illustrating the knee airbag device according to the first embodiment of the present disclosure. Fig. Figure 3 is a sectional view illustrating a state in which the flap part blocks a gap between a lower plate and a housing part when the cushion part is deployed, in the knee airbag device according to the first embodiment of the present disclosure. Fig. 4A to Fig. Figure 4G are top views illustrating a process for folding the cushion part in the knee airbag device according to the first embodiment of the present disclosure. Fig. 5A to Fig. Figure 5C shows views illustrating a process for unfolding the cushion part of the knee airbag device according to the first embodiment of the present disclosure. Fig. Figure 6 is a top view illustrating a state in which a cushion part and a flap part are unfolded in a knee airbag device according to a second embodiment of the present disclosure. Fig. Figure 7 is a sectional view illustrating the knee airbag device according to the second embodiment of the present disclosure. Fig. Figure 8 is a sectional view illustrating a state in which the flap part blocks a gap between a lower plate and a housing part when the cushion part is deployed, in the knee airbag device according to the second embodiment of the present disclosure. Fig. 9A to Fig. Figure 9C shows views illustrating a process for unfolding the cushion part in the knee airbag device according to the second embodiment of the present disclosure. DETAILED DESCRIPTION

[0022] A knee airbag device according to embodiments of the present disclosure is described below with reference to the accompanying drawings. It should be noted that the drawings are not to scale and may be exaggerated with regard to line thickness or component dimensions, solely for the sake of clarity and clarification. Furthermore, the terms used here are defined taking into account the functions of the disclosure and may be modified according to the habits and intentions of users or operators. Therefore, the definitions of the terms are to be understood in accordance with the entirety of the disclosure presented here.

[0023] Fig. Figure 1 is a top view illustrating a state in which a cushion part and a flap part are unfolded, in a knee airbag device according to a first embodiment of the present disclosure, Fig. Figure 2 is a sectional view illustrating the knee airbag device according to the first embodiment of the present disclosure, and Fig. Figure 3 is a sectional view illustrating a state in which the flap part blocks a gap between a lower plate and a housing part when the cushion part is deployed, in the knee airbag device according to the first embodiment of the present disclosure.

[0024] According to Fig. 1 to Fig. 3 The knee airbag device according to the first embodiment of the present disclosure has a housing part 110 , a cover part 120 , a pillow part 130 and a flap part 140 on.

[0025] The knee airbag device is located under a lower plate. 10 a vehicle installed in front of an occupant's knee. The lower end of the lower plate 10 is essentially at the same height as the lower end of the housing part 110 installed. The housing part 110 is on the front side of the lower plate 10 arranged.

[0026] The housing part 110 It is designed in such a way that one side of it is open. This means that the housing part 110 It is designed in such a way that it is open at the bottom and has an opening (not shown) on its underside. The housing part 110 It can be in the form of a rectangular box. The housing part 110 is on both sides of the same with hook sections 112 provided.

[0027] The cover part 120is installed in such a way that it blocks the opening of the housing part 110 covers. The cover part 120 It has hook holes on both sides. 121 trained, who are equipped with the hook sections 112 of the housing part 110 fit together. The cover part 120 is under the housing part 110 arranged. The cover part 120 It has a cover cutout part on the inside side. 123 trained. The cover cutout part 123 It is designed in the width direction of the vehicle. In the cover cutout part 123 A large number of cut-out holes (not shown) are arranged in a straight line.

[0028] The pillow part 130 is in a folded state within the housing part 110 recorded and with a gas generator 101 connected. When from the gas generator 101 escaping gas into the cushion part 130When the pillow part is blown in 130 unfolded. The cushion part 130 is from the underside of the lower plate 10 unfolds upwards to cover the occupant's knee.

[0029] An internal retaining strap part 132 is with the inside of the pillow part 130 connected to achieve an inflation thickness of the pillow part 130 to limit. A multitude of internal retaining strap components 132 can in the unfolding direction of the cushion part 130 be arranged. The inner retaining strap part 132 is connected to the cushion part via a retaining strap seam (not shown). 130 connected. The inner retaining strap part 132 is with a communication gap 133 designed so that gas can pass through it.

[0030] The flap part 140 is installed in such a way that it covers the folded part of the pillow 130 on the side of the cover part120 surrounds, and blocks a gap between the housing part 110 and the lower plate 10 , essentially to prevent the pillow part 130 when unfolding the cushion part 130 on the lower plate 10 gets stuck.

[0031] The flap part 140 can be made from a fabric or substantially the same material as the pillow part 130 be manufactured. When unfolding the cushion part 130 The flap part 140 folded over and is between the housing part 110 and the lower plate 10 arranged to close the gap between the housing part 110 and the lower plate 10 to block, making it possible regardless of the height of the lower end of the bottom plate 10 essentially to prevent the pillow part 130 at the bottom end of the lower plate 10gets stuck or interferes with it.

[0032] Furthermore, the gap between the housing part 110 and the lower plate 10 from the flap part 140 blocked, which makes it possible to essentially prevent the pillow part from 130 in the lower plate 10 (in the direction of the front of the vehicle) is unfolded.

[0033] The flap part 140 is in the unfolding direction of the cushion part 130 with a tear line 145 on the opposite side (interior side). The tear line 145 divides the flap section 140 into a multitude of flap parts 140 .

[0034] The rip line 145 of the flap part 140 is trained in such a way that they are in Fig. 2 relative to the center of the pillow part 130 in one direction from the lower plate 10away, that is, to the right, is pre-tensioned. In other words, since the tear line 145 is designed in such a way that it is in the unfolding direction of the cushion part 130 is pre-tensioned towards the opposite side when the cushion part is unfolded 130 an opposite side of the flap part 140 Separated in the direction of unfolding. Blocked, since the flap part 140 in the unfolding direction (inside side) of the cushion part 130 When folded down, the flap part 140 the gap between the lower end of the lower plate 10 and the housing part 110 .

[0035] Accordingly, it is possible to essentially prevent the pillow part from 130 when unfolding the cushion part 130 at the bottom end of the lower plate 10gets stuck or interferes with it, and essentially to prevent the unfolding direction of the cushion part. 130 is deflected or the cushion part 130 It unfolds incompletely. Furthermore, it essentially prevents the pillow part from unfolding. 130 in the lower plate 10 is deployed, making it possible to ensure the safety of the occupant.

[0036] One side of the flap part 140 is with the pillow part 130 or an ironing part 103 connected, and the other side of the flap part 140 is with the hook section 112 of the housing part 110 jammed.

[0037] The rip line 145 is between one side and the other side of the flap part 140 trained. After the cover separation part has been detached. 123 of the cover part 120 will the rip line 145 of the flap part 140Torn open. When the tear line 145 of the flap part 140 If it is torn open, a section of the flap part will be 140 , which is attached to the hook section 112 got stuck on the flap part 140 separated.

[0038] The flap part 140 has a valve body 142 and locking sections 143 open. The valve body 142 is with the ironing part 103 or the pillow part 130 connected and installed in such a way that it holds the folded pillow part 130 surrounds. The locking section 143 extends from the other side of the valve body 142 , to use the hook part 112 to be locked in place, and is connected to the tear line 145 Equipped with a multitude of locking sections. 143 is along the other side of the valve body 142 trained.

[0039] The locking section 143is equipped with a locking hole 144 formed, into which the locking section 112 is used. Such a locking section 143 It can be formed in various forms, as long as it is connected to the hook section. 112 It is locked in place. Because the tear line 145 on the locking section 143 The length of the tear line is formed. 145 reduced. Accordingly, this can then occur when the inflation pressure of the cushion part 130 on the valve body 142 The tear line is applied. 145 easily torn.

[0040] A folding method of the knee airbag device according to the first embodiment of the present disclosure, which is designed as described above, is described below.

[0041] Fig. 4A to Fig. Figure 4G are top views illustrating a process for folding the cushion part in the knee airbag device according to the first embodiment of the present disclosure.

[0042] According to Fig. 4A to Fig. 4G is in a state where the pillow part 130 unfolded, the flap part 140 folded upwards to cover the ironing part 103 to cover (see Fig. 4A and Fig. 4B). The top side of the pillow part 130 is folded several times in a zigzag pattern (see Fig. 4C).

[0043] The lower side of the pillow part 130 is folded in the form of a roll (see Fig. 4D and Fig. 4E). Folding in the shape of a roll means that the bottom side of the pillow part 130 wound in one direction.

[0044] Both sides of the pillow part 130 are folded in a zigzag pattern (see Fig. 4F). In this process, both sides of the zigzag-folded section and the section folded in the shape of a roll are folded zigzag-wise towards a central side.

[0045] The flap part 140 It is folded downwards to cover the bottom of the folded pillow part. 130 to surround. The lower side (the side of the cover part) is to be surrounded. 120 ) of the pillow part 130 from the flap part 140 surrounded. The folded part of the pillow 130 is in the housing part 110 packed, and then the locking sections are 143 of the flap part 140 with the hook sections 112 of the housing part 110 locked (see Fig. 4G).

[0046] After the pillow part 130 into the housing part 110 Once packed, the cover part will be 120 to the housing part 110 grown. In doing so, since the hook sections 112of the housing part 110 at the hook holes 121 of the cover part 120 are attached, the cover part 120 with the housing part 110 locked in place. The cover separator part. 123 of the cover part 120 is on the side of the lower plate 10 (Interior side) arranged.

[0047] Operation of the knee airbag device according to the first embodiment of the present disclosure, which is installed as described above, is described below.

[0048] Fig. 5A to Fig. Figure 5C shows views illustrating a process for unfolding the cushion part of the knee airbag device according to the first embodiment of the present disclosure.

[0049] According to Fig. 5A to Fig. 5C will then activate the gas generator when a vehicle collision is detected. 101 put into operation. When in the gas generator 101generated gas in the cushion part 130 When the pillow part is blown in 130 inflated. When the inflation pressure of the cushion part 130 on the cover part 120 When applied, the cover separator part 123 of the cover part 120 separated, so that the cover part 120 is rotated towards the front of the vehicle to access the lower side of the housing part 110 to open.

[0050] Then, when the inflation pressure of the cushion part 130 on the flap part 140 The tear line is applied. 145 of the flap part 140 through the inflation pressure of the cushion part 130 Torn open. Because the tear line 145 on the other side (opposite side of the interior) of the flap part 140 The flap part is arranged 140 by tearing open the tear line 145in the unfolding direction of the cushion part 130 folded over. If the pillow part 130 When unfolded towards the interior side, the flap section blocks it. 140 the gap between the lower end of the lower plate 10 and the housing part 110 .

[0051] Accordingly, it is possible to essentially prevent this from happening when the cushion part is unfolded. 130 the pillow part 130 at the bottom end of the lower plate 10 gets stuck or interferes with it, and essentially to prevent the unfolding direction of the cushion part. 130 is deflected or the cushion part 130 It unfolds incompletely. Furthermore, it essentially prevents the pillow part from unfolding. 130 in the lower plate 10 is deployed, making it possible to ensure the safety of the occupant.

[0052] Next, a knee airbag device according to a second embodiment of the present disclosure is described below. Since the second embodiment is essentially the same as the first embodiment, except for the shape of the flap part, the same reference numerals are used for the same components, and a description of them is omitted.

[0053] Fig. Figure 6 is a top view illustrating a state in which a cushion part and a flap part are unfolded, in a knee airbag device according to a second embodiment of the present disclosure, Fig. Figure 7 is a sectional view illustrating the knee airbag device according to the second embodiment of the present disclosure, and Fig. Figure 8 is a sectional view illustrating a state in which the flap part blocks a gap between a lower plate and a housing part when the cushion part is deployed, in the knee airbag device according to the second embodiment of the present disclosure.

[0054] According to Fig. 6 to Fig. 8 is a flap part 150 installed in such a way that it covers the side of the folded pillow part 130 , which belong to the cover part 120 is facing, surrounds and creates a gap between the housing part 110 and the lower plate 10 blocked, essentially to prevent the pillow part from unfolding. 130 the pillow part 130 on the housing part 110 gets stuck.

[0055] In the flap section 150 is a tear line 155 on the unfolding side (interior side) of the cushion part 130 trained. In the flap section 150will be, since the tear line 155 on the unfolding side of the cushion part 130 is formed, a part of the flap section 150 together with the cover part 120 folded towards the opposite side of the interior, and the remaining part of the flap section becomes 150 in the unfolding direction of the cushion part 130 folded down, so that the flap part 150 the gap between the lower end of the lower plate 10 and the housing part 110 blocked.

[0056] Accordingly, it is possible to essentially prevent this from happening when the cushion part is unfolded. 130 the pillow part 130 at the bottom end of the lower plate 10 gets stuck or interferes with it, and essentially to prevent the unfolding direction of the cushion part. 130 is deflected or the cushion part 130It unfolds incompletely. Furthermore, it essentially prevents the pillow part from unfolding. 130 in the lower plate 10 is deployed, making it possible to ensure the safety of an occupant.

[0057] The flap part 150 has a first valve section 151 and a second flap section 156 on.

[0058] One side of the first flap section 151 is with the pillow part 130 or the ironing part 103 connected, the other side of the first flap section 151 is with the hook section 112 of the housing part 110 locked, and the tear line 155 is on the unfolding side of the cushion part 130 trained.

[0059] The second flap section 156 is arranged in such a way that it covers the first flap section 151 overlaps and over a first sewn section157 and a second sewn section 158 at the first flap section 151 is fixed. The second flap section 156 can be found under the first flap section 151 be arranged.

[0060] The first sewn part 157 is at a position in one direction from the tear line 155 trained away, and the second sewn section 158 is in the other direction from the tear line 155 , that is, in a direction opposite to that of the first sewn section 157 formed. In the present embodiment, the first sewn section 157 closer to the lower plate 10 as the tear line 155 arranged and is the second sewn section 158 further from the lower plate 10 farther than the tear line 155 arranged.

[0061] The first sewn part 157fixes the first flap section 151 and the second flap section 156 to each other, even if the pillow part 130 is inflated. The second sewn section 158 It will tear open when the pillow part 130 is inflated, and separates the first flap section. 151 from the second flap section 156 .

[0062] This means that the first sewn part 157 to fix the second flap section 156 at the first flap section 151 serves and the second sewn part 158 serves to temporarily join them together, so that the second flap section 156 from the first flap section 151 is separated when the pillow part 130 is inflated.

[0063] The first flap section 151 has a first valve body 152 and a first locking section 153open. One side of the first valve body 152 is with the pillow part 130 or the ironing part 103 connected, and the tear line 155 is on the unfolding side of the cushion part 130 trained.

[0064] The first locking section 153 extends from the other side of the first valve body 152 , to use the hook section 112 to be locked in place. A multitude of initial locking sections. 153 can be on the other side of the first valve body 152 be trained.

[0065] Since a folding method for the pillow part 130 Since the second embodiment is essentially the same as the first embodiment, a description of it is unnecessary.

[0066] Operation of the knee airbag device according to the second embodiment of the present disclosure, which is installed as described above, is described below.

[0067] Fig. 9A to Fig. Figure 9C shows views illustrating a process for unfolding the cushion part in the knee airbag device according to the second embodiment of the present disclosure.

[0068] According to Fig. 9A to Fig. 9C will then activate the gas generator when a vehicle collision is detected. 101 put into operation. When in the gas generator 101 generated gas in the cushion part 130 When the pillow part is blown in 130 inflated. When the inflation pressure of the cushion part 130 on the cover part 120 When applied, the cover separator part 123 of the cover part 120 separated, so that the cover part 120is rotated towards the front of the vehicle to access the lower side of the housing part 110 to open.

[0069] Then, when the inflation pressure of the cushion part 130 on the flap part 150 The tear line is applied 155 of the first valve section 151 through the inflation pressure of the cushion part 130 torn open. Furthermore, since the second sewn part 158 , which is the first flap section 151 and the second flap section 156 temporarily joined together, torn open, the first flap section 151 and the second flap section 156 to the second sewn part 158 separated around. Even then, the first sewn part is fixed. 157 still the first flap section 151 and the second flap section 156 .

[0070] In this process, the tear line 155on one side (interior side) of the first flap section 151 is arranged, the first flap section 151 by tearing open the tear line 155 folded towards the front of the vehicle. The first flap section is then folded. 151 together with the cover part 120 folded towards the front of the vehicle.

[0071] If the pillow part 130 When unfolded towards the interior side, the second flap section 156 , which is over the first sewn part 157 with the first flap section 151 is connected, folded towards the interior side to close the gap between the lower end of the lower plate 10 and the housing part 110 to block. Part of the first flap section. 151 , which is through the tear line 155 is separated, that is, a part that is not connected to the second flap section 156is connected, together with the cover part 120 folded over.

[0072] Accordingly, it is possible to essentially prevent the pillow part from 130 when unfolding the cushion part 130 at the bottom end of the lower plate 10 gets stuck or interferes with it, and essentially to prevent the unfolding direction of the cushion part. 130 is deflected or the cushion part 130 It unfolds incompletely. Furthermore, it essentially prevents the pillow part from unfolding. 130 in the lower plate 10 is deployed, making it possible to ensure the safety of the occupant.

[0073] Although the present disclosure has been described with reference to the embodiments shown in the drawings, the embodiments of the disclosure serve only for illustrative purposes, and it will be apparent to those skilled in the art that various modifications and equivalent other embodiments are possible.

[0074] Thus, the true technical scope of protection of the disclosure is defined in the following claims. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] KR 1020190011757

[0001]

Claims

[1] Knee airbag device comprising: a housing part formed such that one side thereof is open; a cover part installed to cover the open portion of the housing part; a cushion part which is accommodated in a folded state in the housing part and is connected to a gas generator; and a flap portion installed to surround the folded cushion portion on one side of the cover portion and block a gap between the housing portion and a lower panel of a vehicle to substantially prevent the cushion portion from snagging on the lower panel when the cushion portion is deployed. [2] The knee airbag device according to claim 1, wherein the flap part is provided with a tear line dividing the flap part into a plurality of flap parts, and the tear line is formed on the flap part so as to be biased relative to a center of the cover part in a direction away from the lower plate. [3] The knee airbag device according to claim 1, wherein the flap part is provided with a tear line dividing the flap part into a plurality of flap parts, and the tear line is formed on the flap part so as to be biased toward an opposite side relative to a center of the cover part in a deployment direction of the cushion part. [4] A knee airbag device according to claim 3, wherein one side of the flap part is connected to the cushion part or a bracket part, and the other side of the flap part is locked to a hook portion of the housing part. [5] A knee airbag device according to claim 4, wherein the flap part comprises: a flap body connected to the bracket part or the cushion part and installed to surround the folded cushion part; and a locking portion extending from the other side of the flap body to be locked with the hook portion and provided with the tear line. [6] A knee airbag device according to claim 1, wherein the flap part comprises: a first flap portion installed to surround the folded cushion portion on the cover portion side and provided with a tear line; and a second flap portion arranged to overlap the first flap portion. [7] The knee airbag device according to claim 6, wherein the tear line divides the first flap portion into a plurality of first flap portions and is formed on the first flap portion to be biased relative to a center of the cover member in a direction closer to the lower plate. [8] The knee airbag device according to claim 6, wherein the tear line divides the first flap portion into a plurality of first flap portions and is formed on the first flap portion to be biased relative to a center of the cover member in a deployment direction of the cushion member. [9] Knee airbag device according to claim 8, wherein the first flap portion has one side connected to the cushion part or the bracket part and the other side locked to the hook portion of the housing part, the second flap section is connected to the first flap section via a first sewn part and a second sewn part, and the second sewn part is torn when the pillow part is inflated. [10] The knee airbag device according to claim 9, wherein the first sewn part is formed at a position closer to the lower plate than the tear line, and the second sewn part is formed at a position farther from the lower plate than the tear line. [11] A knee airbag device according to claim 10, wherein the first flap portion comprises: a first flap body, one side of which is connected to the cushion part or the bracket part and which is provided with the tear line; and a first locking portion extending from the other side of the first flap body to be locked with the hook portion. [12] A knee airbag device according to claim 1, wherein the flap part is folded to cover the bracket part, one upper side of the pillow part is folded in a zigzag pattern, a lower side of the cushion part is folded into a roll, and both sides of the pillow part are folded in a zigzag pattern.

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