Knee airbag device and method for manufacturing the same

Abstract

Knee airbag device, comprehensive: an airbag (30) which is inflated by gas introduced into it; an airbag housing (10) that accommodates the airbag (30) therein; and a gas generator (40) for generating the gas, wherein a section of the gas generator (40) is received in the airbag (30), and a remaining section is arranged outside the airbag (30) in the airbag housing (10), wherein the airbag (30) is designed with a folded section, in that the airbag (30) is folded such that the airbag (30) is shorter at an upper section therein than at a lower section therein, an upper retaining cable (70) is coupled to an inner surface of the upper section of the airbag (30), and a lower retaining cable (80) is coupled to an inner surface of the lower section of the airbag (30), wherein the gas generator (40) is designed with at least one pin (42, 44) which from an outer circumferential surface of the gas generator (40) on the section of the gas generator (40) received in the airbag (30) and extends through the airbag (30) in such a way that the pin is coupled to the airbag housing (10), the airbag (30) is designed with a first slot (35) through which the section of the gas generator (40) is inserted into the airbag (30); and The knee airbag device further comprises a sealing element (60) coupled to the airbag (30), wherein the sealing element (60) seals the first slot (35) on an outer side of the airbag (30), provided that the section of the gas generator (40) has been inserted into the airbag (30) through the first slot (35), comprising at least one tenon, a first tenon (42) and a second tenon (44); the first pin (42) is coupled to the airbag housing (10) after extending through the airbag (30); and the second pin (44) is coupled to the airbag housing (10) after extending through the airbag (30) and the sealing element (60), furthermore comprehensive: a protective element (50) arranged in the airbag (30) to prevent the airbag (30) from being damaged by the heat of the gas generated by the gas generator (40); the first pin (42) is coupled to the airbag housing (10) after extending through the protective element (50) and the airbag (30); and the second pin (44) is coupled to the airbag housing (10) after extending through the protective element (50), the airbag (30) and the sealing element (60), where: the protective element (50) is formed with a first through-hole (52) through which the first pin (42) extends, and a second through-hole (54) through which the second pin (44) extends; the airbag (30) is formed with a third through-hole (32) through which the first pin (42) extends, and a fourth through-hole (34) through which the second pin (44) extends; the sealing element (60) is designed with a fifth through-hole (64) through which the second pin (44) extends; and the airbag housing (10) is designed with a first mounting hole (12) into which the first pin (42) is inserted after extending through the first through-hole (52) and the third through-hole (32) to be coupled to the airbag housing (10), and a second mounting hole (14) into which the second pin (44) is inserted after extending through the fourth through-hole (34) and the fifth through-hole (64) to be coupled to the airbag housing (10). wherein the sealing element (60) comprises: a sealing section (61) for sealing the first slot (35), provided that the section of the gas generator (40) has been inserted into the airbag (30) through the first slot (35), wherein the sealing section (61) is formed with the fifth through-hole (64); and an extension section (62) extending from the sealing section (61), wherein the extension section (62) together with the sealing section (61) comprises at least a section of the outer surface of the gas generator (40) arranged outside the airbag (30), wherein the extension section (62) is formed with a second slot (62a) open on one side thereof in order to encompass at least the section of the outer surface of the gas generator (40) which is arranged outside the airbag (30).

Description

CROSS-REFERENCE TO RELATED REGISTRATION

[0001] This application claims the benefits of Korean patent application No. 10-2015-0127878, filed with the Korean Patent Office on September 9, 2015, the disclosures of which are incorporated herein by reference. BACKGROUND OF THE INVENTION 1. Field of the invention

[0002] The present invention relates to a knee airbag device and a method for manufacturing the same, and in particular to a knee airbag device for protecting the knees of an occupant in a vehicle in the event of an accident and a method for manufacturing the same. 2. Description of the related prior art

[0003] A vehicle is usually equipped with an airbag system which, in the event of an accident, is supplied with gas and therefore inflates to protect an occupant in the vehicle.

[0004] Such an airbag is installed in specific areas of a vehicle. For example, there is a driver airbag device mounted in the steering wheel to protect a driver sitting in the driver's seat, a passenger airbag device mounted in a section of trim above a glove compartment to protect an occupant sitting in a passenger seat, a curtain airbag device mounted along a roof rail to protect one side of an occupant, a knee airbag device mounted in a dashboard to protect an occupant's knees, and so on.

[0005] The knee airbag system consists of an airbag housing installed in the dashboard, which contains a gas generator for producing the gas and an airbag. In a vehicle accident, the airbag receives gas generated by the gas generator and is therefore inflated and deployed to protect the knee of an occupant.

[0006] Typically, the gas generator is installed inside the airbag to allow the airbag to be inflated and unfolded by the gas generated by the gas generator.

[0007] To install the gas generator in the airbag, a hole is drilled in the airbag so that the gas generator is inserted through this hole. This means the gas generator is inserted through the hole in such a way that it is completely contained within the airbag. This is described, for example, in US 2012 / 0007345A1.

[0008] A cable is connected to the gas generator to send an electrical signal from a control unit to the generator in the event of a vehicle accident. When the gas generator receives the electrical signal via the cable, a gas-generating medium contained within the generator is burned, thus producing gas.

[0009] However, the cable connected to the gas generator is supposed to be connected to the control unit after it has been routed through the gas generator hole formed by the airbag. For this reason, the gas generator hole remains unsealed. Consequently, gas produced by the gas generator in a vehicle accident is released from the airbag through this hole, thus reducing the airbag's deployment pressure. This can lead to a problem where the airbag is unable to adequately protect an occupant's knees.

[0010] DE 10 2010 001 736 A1 discloses a knee airbag for a vehicle with a reinforcement designed to form a seal with an inflation device.

[0011] DE 60 2004 002 164 T2 discloses a knee airbag that is mounted on motor vehicles and inflates in the event of an emergency, for example an accident, and an airbag arrangement in which a gas generator is connected to the airbag.

[0012] From WO 2009 / 056 598 A1, an airbag module, in particular for a motor vehicle, is known, comprising a gas bag which is inflatable for the protection of a person, a gas bag cover of the gas bag which defines an interior of the gas bag which can be filled with gas for inflation of the gas bag, a gas generator for providing the gas required for inflation of the gas bag, an insertion opening of the gas bag cover wherein the gas generator is inserted through the insertion opening into the interior of the gas bag so that gas provided by the gas generator can enter the interior of the gas bag, a border region of the insertion opening which limits the insertion opening and surrounds the gas generator in an annular manner, and a sealing means for sealing the insertion opening. SUMMARY OF THE INVENTION

[0013] Consequently, the present invention was developed in view of the above-mentioned problem, and it is an object of the present invention to provide a knee airbag device capable of ensuring a desired trigger pressure of an airbag by preventing the escape of gas from the airbag, and a method for manufacturing the same.

[0014] The objects of the present invention are not limited to those described above, and the person skilled in the art can clearly identify other objects of the present invention not yet described by reference to the following detailed description.

[0015] According to the invention, this problem is solved by a knee airbag device according to claim 1.

[0016] Furthermore, this task is solved by a method for manufacturing a knee airbag device.

[0017] Detailed aspects of other embodiments will become clear from the following description and the accompanying drawings.

[0018] The knee airbag device and the method for manufacturing it according to the embodiments of the present invention provide various modes of operation. Specifically, only a section of the gas generator is inserted into the airbag, while the remaining section is located outside the airbag within the airbag housing. Accordingly, the cable that sends an electrical signal to the gas generator to cause it to produce gas can be connected to the gas generator located outside the airbag, and the first slot, which allows the insertion of a section of the gas generator into the airbag, can be sealed. Consequently, it is possible to prevent the gas generated by the gas generator from escaping the airbag, and therefore a desired airbag deployment pressure can be ensured.

[0019] The modes of operation of the present invention are not limited to those described above. Other modes of operation not yet described can be clearly understood by a person skilled in the art with reference to the attached claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other items, features and other advantages of the present invention will become clearer from the following detailed description in conjunction with the accompanying drawings, in which: Fig. 1 is a perspective exploded view illustrating a knee airbag device according to an embodiment of the present invention; Fig. 2 is a partial view illustrating the knee airbag device according to the illustrated embodiment of the present invention; Fig. 3. One view is that which describes the functioning of the in Fig. 2 illustrated knee airbag device; Fig. 4 is a view illustrating a sealing element coupled to an airbag of the knee airbag device according to the illustrated embodiment of the present invention; and Fig. 5 and Fig. Six views illustrate a process for coupling the sealing element with a gas generator of the knee airbag device according to the illustrated embodiment of the present invention. DETAILED DESCRIPTION OF PREFERRED EXECUTION FORMS

[0021] Detailed reference is now made to the embodiments, examples of which are illustrated in the accompanying drawings. However, the present disclosure can be implemented in many different forms and should not be considered limited to the embodiments presented here. Rather, these embodiments are provided so that this disclosure is thorough and comprehensive, fully conveying the scope of the disclosure to the person skilled in the art. The present disclosure is defined only by the categories in the claims. In certain embodiments, detailed descriptions of the apparatus's construction or of methods well known to the prior art have been omitted so as not to impede the understanding of the disclosure by a person skilled in the art. Where possible, the same reference numerals are consistently used in the drawings to designate identical or similar parts.

[0022] A knee airbag device and a method for manufacturing the same according to an exemplary embodiment of the present invention are described below with reference to the associated drawings.

[0023] Fig. Figure 1 is a perspective exploded view illustrating a knee airbag device according to an embodiment of the present invention. Fig. Figure 2 is a partial view illustrating the knee airbag device according to the illustrated embodiment of the present invention. Fig. 3 is a view that illustrates how the in Fig. The knee airbag device shown in section 2 is illustrated.

[0024] Referring to Fig. 1 to 3, the knee airbag device according to the illustrated embodiment of the present invention comprises an airbag housing 10, an airbag flap 20, an airbag 30, a gas generator 40, and a protective element 50.

[0025] The airbag housing 10 accommodates the airbag 30 together with the airbag flap 20. That is, the airbag 30 can be accommodated in a folded state within an interior space defined by the airbag housing 10 and the airbag flap 20.

[0026] Two mounting brackets 15 are provided on the top of the airbag housing 10 for mounting it to a vehicle body. The two mounting brackets 15 are spaced laterally apart from each other. The mounting brackets 15 can be attached to the vehicle body with bolts. Once the mounting brackets 15 are attached to the vehicle body, the airbag housing 10 can be positioned under an instrument panel 1 located inside the vehicle.

[0027] The airbag flap 20 is positioned at the bottom of the airbag housing 10 such that a rear end of the airbag flap 20 is pivotably coupled to a rear end of the airbag housing 10. When the airbag 30 is inflated by gas generated by the gas generator 40, the airbag flap 20 is pivoted about its rear end, which is coupled to the airbag housing 10, by the inflation force of the airbag 30. As a result, the front end of the airbag flap 20 is moved away from the airbag housing 10. The airbag 30 then exits the airbag housing 10 through a gap formed between the airbag housing 10 and the airbag flap 20 and unfolds in the vehicle compartment.

[0028] The airbag 30 is made of a flexible material that can be expanded by gas generated by the gas generator 40. The airbag 30 is inflated by gas generated by the gas generator 40 and then exits the airbag housing 10 through a gap between the airbag housing 10 and the airbag flap 20 in such a way that the airbag 30 unfolds upwards from under the dashboard 1. Consequently, the airbag is positioned between the dashboard 1 and the occupant.

[0029] The airbag 30 is coupled at its rear end to a rear wall of the airbag housing 10 in such a way that it is received in the airbag housing 10.

[0030] A cable 45 is connected to the gas generator 40. The cable 45 can be connected to the rear end of the gas generator 40 via a connector. In the event of a vehicle accident, the cable 45 sends an electrical signal to the gas generator 40, which is generated by a control unit, such as an electronic control unit (ECU). When the electrical signal is sent to the gas generator 40 via the cable 45, the gas-generating medium located in the gas generator 40 is combusted, thus producing gas.

[0031] Although with reference to Fig. In sections 4 to 6, where a detailed configuration of the gas generator 40 is described, only one section of the gas generator 40 is incorporated into the airbag 30, and the remaining section of the gas generator 40 is located outside the airbag 30 in the airbag housing 10. This means that a gas outlet section of the gas generator 40 is incorporated into the airbag 30, while a section of the gas generator 40 connected to the cable 45 is located outside the airbag 30 in the airbag housing 10, thus preventing gas discharged into the airbag 30 from escaping from the airbag 30.

[0032] To accommodate a desired section of the gas generator 40 within the airbag 30, a first slot 35 is formed at the rear end of the airbag 30 to allow the insertion of a section of the gas generator 40 into the airbag 30. Furthermore, a sealing element 60 is coupled to the rear end of the airbag 30 to seal the first slot 35, provided that a section of the gas generator 40 has been inserted into the airbag 30 through the first slot 35. The sealing element 60 is coupled to an outer surface of the airbag 30 and is located within the airbag housing 10. The sealing element 60 can be made of the same flexible material as the airbag 30 and can be coupled to the airbag 30 by sewing.

[0033] Meanwhile, the protective element 50 is coupled to a rear surface of the airbag 30 within the airbag housing 30. The protective element 50 acts as a shield to prevent damage to the airbag 30 from the heat of the gas generated by the gas generator 40. The protective element 50 can be made of the same flexible material as the airbag 30 and can be stitched to it.

[0034] The protective element 50 is formed with a first through-hole 52 and a second through-hole 54. A third through-hole 32 and a fourth through-hole 34 are formed through the rear end of the airbag 30. A fifth through-hole 64 is formed through the sealing element 60. Furthermore, a first mounting hole 12 and a second mounting hole 14 are formed through the rear wall of the airbag housing 10. The first through-holes 52, third through-holes 32, and first mounting holes 12 are each arranged at corresponding positions. The second through-holes 54, fourth through-holes 34, fifth through-holes 64, and second mounting holes 14 are each arranged at corresponding positions.

[0035] Meanwhile, a first pin 42 and a second pin 44 project from an outer circumferential surface of the gas generator 40 incorporated into the airbag 30. The first pin 42 and the second pin 44 are spaced apart from each other longitudinally in a lateral direction from the gas generator 40. The first pin 42 is located near the front end of the gas generator 40. The second pin 44 is located substantially on a central section of the gas generator 40, spaced 89 mm from the rear end of the gas generator 40.

[0036] A gas outlet 46 for the release of gas is formed on the gas generator 40 between the first pin 42 and the second pin 44. The gas outlet 46 is arranged near the first pin 42. In one embodiment, a plurality of gas outlets 46 can be arranged spaced apart from one another along the outer circumference of the gas generator 40.

[0037] Provided that a section of the gas generator 40 has been inserted into the airbag 30, the first pin 42 extends through the protective element 50 and the airbag 30, and is then attached to the rear wall of the airbag housing 10. That is, provided that the gas generator 40 has been partially inserted into the airbag 30, a free end of the first pin 42 projects outwards from the airbag 30 after extending through the first through-hole 52 and the third through-hole 32. The projecting end of the first pin 42 is then inserted into the first mounting hole 12 and is thus attached to the airbag housing 10.

[0038] Furthermore, assuming that the gas generator 40 has been partially inserted into the airbag 30, the second pin 44 extends through the protective element 50, the airbag 30, and the sealing element 60, and is then attached to the rear wall of the airbag housing 10. That is, assuming that the gas generator 40 has been partially inserted into the airbag 30, a free end of the second pin 44 protrudes outwards from the airbag 30 after extending through the second through-hole 54, the fourth through-hole 34, and the fifth through-hole 64. The protruding end of the second pin 44 is then inserted into the second mounting hole 14 and is thus secured to the airbag housing 10.

[0039] Meanwhile, the airbag housing 10 is positioned below the dashboard 1 at a height lower than the occupant's knees. Accordingly, the airbag 30 should deploy upwards to protect the occupant's knees. For this purpose, the airbag 30 can be designed with a folded section 36, such that the upper section of the airbag 30 is shorter than the lower section. The folded section 36 allows a greater tensile force to be applied to the upper section of the airbag 30 than to the lower section, causing the airbag 30 to deploy as it is bent upwards by rotating around the folded section 36. In its deployed state, the airbag 30 can therefore be positioned between the dashboard 1 and the occupant's knees.

[0040] An upper retaining cable 70 is connected to an inner surface of the upper section of the airbag 30 by sewing. A lower retaining cable 80 is connected to an inner surface of the lower section of the airbag 30 by sewing.

[0041] The upper retaining rope 70 and the lower retaining rope 80 are spaced apart to form a gas passage between them for the passage of gas.

[0042] Gas introduced into the airbag 30 by the gas generator 40 is guided through the gas passage and thereby impinges on the upper retaining cable 70 and the lower retaining cable 80. Under these circumstances, the triggering force of the airbag 30 is increased by the force of the gas striking the upper retaining cable 70 and the lower retaining cable 80.

[0043] In the illustrated embodiment, a plurality of upper retaining cables 70 and a plurality of lower retaining cables 80 are arranged.

[0044] That is, the upper retaining cables 70 include a first upper retaining cable 72, a second upper retaining cable 74 and a third upper retaining cable 76, which are arranged on a section of the airbag 30 that is in an unfolded state outside the instrument panel 1, with the retaining cables being spaced apart from each other, and a fourth retaining cable 78, which is arranged on a section of the airbag 30 that remains in the interior space defined between the airbag housing 10 and the airbag flap 20, and is not unfolded outside the instrument panel 1.

[0045] Furthermore, the lower retaining cables 80 include a first lower retaining cable 82, which is spaced apart from the first upper retaining cable 72 to define the gas passage between the first upper retaining cable 72 and the first lower retaining cable 82, a second lower retaining cable 84, which is spaced apart from the second upper retaining cable 74 to define the gas passage between the second upper retaining cable 74 and the second lower retaining cable 84, a third lower retaining cable 86, which is spaced apart from the third upper retaining cable 76 to define the gas passage between the third upper retaining cable 76 and the third lower retaining cable 86, and a fourth lower retaining cable 88, which is spaced apart from the fourth upper retaining cable 78 to define the gas passage between the fourth upper retaining cable 78 and the fourth lower retaining cable 88.

[0046] Each of the first upper retaining rope 72, the second upper retaining rope 74, and the third upper retaining rope 76 is configured to have a single fold, whereas the fourth upper retaining rope 78 is configured to have a double fold. Similarly, each of the first lower retaining rope 72, the second lower retaining rope 74, and the third lower retaining rope 76 is configured to have a single fold, whereas the fourth lower retaining rope 88 is configured to have a double fold.

[0047] In the illustrated embodiment, the folded section 36 is formed by folding the airbag 30 and is coupled to the fourth upper retaining cable 78 by sewing.

[0048] In the illustrated embodiment, four upper retaining cables 70 are arranged, and the folded section 36 is coupled to the fourth upper retaining cable 78 by sewing. However, any number of upper retaining cables 70 can be used, provided that an upper retaining cable, which is arranged on a section of the airbag 30 that remains within the interior space defined between the airbag housing 10 and the airbag flap 20 and is not unfolded outside the instrument panel 1 (in the illustrated case, the fourth upper retaining cable 78), is coupled to the folded section 36 by sewing.That is, the folded section 36 is formed at a position where the upper retaining cable, which is arranged in the interior space defined between the airbag housing 10 and the airbag flap 20, and therefore the airbag 20 can be unfolded upwards outside the instrument panel 1 while rotating upwards around the folded section 36 as a pivot point.

[0049] Below is a method for manufacturing the knee airbag device which has the configurations described above according to the illustrated embodiment of the present invention.

[0050] Fig. Figure 4 is a view illustrating the sealing element coupled to the airbag of the knee airbag device according to the illustrated embodiment of the present invention. Figures 5 and 6 are views illustrating a process for coupling the sealing element to the gas generator of the knee airbag device according to the illustrated embodiment of the present invention.

[0051] Referring to Fig. Section 4 of the sealing element 60 includes a sealing section 61 and an extension section 62. The sealing section 61 seals the first slot 35, provided that a section of the gas generator 40 has been inserted into the airbag 30 through the first slot 35. The fifth through-hole 64 described above is formed in the sealing section 61.

[0052] The extension section 62 extends from the sealing section 61. The extension section 62, together with the sealing section 61, comprises at least one section of the outer circumferential surface of the gas generator 40 located outside the airbag 30.

[0053] A second slot 62a, which is open on one side, is formed on the extension section 62 so that the extension section 62 together with the sealing section 61 includes at least one section of the outer circumferential surface of the gas generator 40 arranged outside the airbag 30.

[0054] In a state where the sealing element 60 is coupled to the airbag 30, the second slot 62a extends along a line passing a third through-hole 32 and a fourth through-hole 34 formed in the airbag 30. The second slot 62a is open on one side facing the third through-hole 32 and the fourth through-hole 34.

[0055] Referring to Fig. In section 5, the first slot 35 on the airbag 30 is configured as described above. The first slot 35 is located next to the fourth through-hole 34. This means that the operator can lift the airbag 30 at the section formed with the fourth through-hole 34 using the first slot 35. After lifting the section of the airbag 30 formed with the fourth through-hole 34, the operator inserts a gas delivery section of the gas generator 40 into the airbag 30. Then, the first pin 42 and the second pin 44 are also inserted into the gas generator 40.

[0056] The first pin 42 projects outwards from the airbag 30 after passing through the first through-hole 52 formed in the protective element 50 and the third through-hole 32 formed in the airbag 30. In contrast, the second pin 44 projects outwards from the airbag 30 after passing through the second through-hole 54 formed in the protective element 50 and the fourth through-hole 34 formed in the airbag 30.

[0057] Referring to Fig.The first slot 35 is then sealed on the outside of the airbag 30 by the sealing element 60. The sealing element 60 is then coupled to the airbag 30. The second pin 44, which extends through the second through-hole 54 and the fourth through-hole 34, is then inserted into the fifth through-hole 64 formed in the sealing element 60. Subsequently, the sealing element 60 is coupled to the airbag 30 by sewing, provided that the sealing element 60 faces the outer surface of the airbag 30, thus sealing the first slot 35. When the sealing element 60 is coupled to the airbag 30 as described above, a free end of the second pin 44 projects outwards from the sealing element 60 after extending through it.

[0058] The first pin 42 is then inserted into the first mounting hole 12 in the airbag housing 10 and is thus attached to the airbag housing 10. Furthermore, the second pin 44 is inserted into the second mounting hole 14 in the airbag housing 10 and is thus attached to the airbag housing 10. Consequently, the airbag 30, the protective element 50, the sealing element 60, and the gas generator 40 are coupled to the airbag housing 10.

[0059] Then a front section of the airbag 30 is folded several times, and then inserted into the interior space defined between the airbag housing 10 and the airbag flap 20, thus completing an airbag assembly.

[0060] As can be seen from the description above, in the knee airbag device manufactured according to the method described above, with the configuration described above, only one section of the gas generator 40 is inserted into the airbag 30, and the remaining section of the gas generator 40 is located outside the airbag 30 in the airbag housing 10. Accordingly, the cable 45, which sends an electrical signal to the gas generator 40 to cause it to produce gas, can be connected to the gas generator 40 located outside the airbag 30, and the first slot 35, which allows the insertion of a section of the gas generator 40 into the airbag 30, can be sealed. Consequently, it is possible to prevent the gas produced by the gas generator 40 from escaping the airbag 30, and therefore a desired deployment pressure of the airbag 30 can be ensured.

[0061] The elements, constructions, modes of operation, etc., as described above, are included in at least one embodiment and are not limited to any one particular embodiment. Furthermore, although preferred embodiments of the present invention have been disclosed for illustrative purposes, it is known to those skilled in the art that various modifications, additions, and substitutions are possible without deviating from the basic concept and scope of protection of the invention as disclosed in the appended claims.

Claims

[1] Knee airbag device, comprising: an airbag (30) which is inflated by gas introduced into it; an airbag housing (10) that accommodates the airbag (30) therein; and a gas generator (40) for generating the gas, wherein a section of the gas generator (40) is received in the airbag (30), and a remaining section is arranged outside the airbag (30) in the airbag housing (10), wherein the airbag (30) is designed with a folded section, in that the airbag (30) is folded such that the airbag (30) is shorter at an upper section therein than at a lower section therein, an upper retaining cable (70) is coupled to an inner surface of the upper section of the airbag (30), and a lower retaining cable (80) is coupled to an inner surface of the lower section of the airbag (30), wherein the gas generator (40) is designed with at least one pin (42, 44) which from an outer circumferential surface of the gas generator (40) on the section of the gas generator (40) received in the airbag (30) and extends through the airbag (30) in such a way that the pin is coupled to the airbag housing (10), the airbag (30) is designed with a first slot (35) through which the section of the gas generator (40) is inserted into the airbag (30); and The knee airbag device further comprises a sealing element (60) coupled to the airbag (30), wherein the sealing element (60) seals the first slot (35) on an outer side of the airbag (30), provided that the section of the gas generator (40) has been inserted into the airbag (30) through the first slot (35), comprising at least one tenon, a first tenon (42) and a second tenon (44); the first pin (42) is coupled to the airbag housing (10) after extending through the airbag (30); and the second pin (44) is coupled to the airbag housing (10) after extending through the airbag (30) and the sealing element (60), furthermore comprehensive: a protective element (50) arranged in the airbag (30) to prevent the airbag (30) from being damaged by the heat of the gas generated by the gas generator (40); the first pin (42) is coupled to the airbag housing (10) after extending through the protective element (50) and the airbag (30); and the second pin (44) is coupled to the airbag housing (10) after extending through the protective element (50), the airbag (30) and the sealing element (60), where: the protective element (50) is formed with a first through-hole (52) through which the first pin (42) extends, and a second through-hole (54) through which the second pin (44) extends; the airbag (30) is formed with a third through-hole (32) through which the first pin (42) extends, and a fourth through-hole (34) through which the second pin (44) extends; the sealing element (60) is designed with a fifth through-hole (64) through which the second pin (44) extends; and the airbag housing (10) is designed with a first mounting hole (12) into which the first pin (42) is inserted after extending through the first through-hole (52) and the third through-hole (32) to be coupled to the airbag housing (10), and a second mounting hole (14) into which the second pin (44) is inserted after extending through the fourth through-hole (34) and the fifth through-hole (64) to be coupled to the airbag housing (10). wherein the sealing element (60) comprises: a sealing section (61) for sealing the first slot (35), provided that the section of the gas generator (40) has been inserted into the airbag (30) through the first slot (35), wherein the sealing section (61) is formed with the fifth through-hole (64); and an extension section (62) extending from the sealing section (61), wherein the extension section (62) together with the sealing section (61) comprises at least a section of the outer surface of the gas generator (40) arranged outside the airbag (30), wherein the extension section (62) is formed with a second slot (62a) open on one side thereof in order to encompass at least the section of the outer surface of the gas generator (40) which is arranged outside the airbag (30). [2] Knee airbag device according to claim 1, wherein the second slot (62a) extends along a line passing the third and fourth through-holes (32, 34) and the open side of the second slot (62a) faces the third and fourth through-holes (32, 34). [3] Knee airbag device according to any of the preceding claims, further comprising: a cable (45) for sending an electrical signal to the gas generator (40) to cause the gas generator (40) to produce gas; and the cable (45) is coupled to the section of the gas generator (40) located outside the airbag (30). [4] Method for manufacturing a knee airbag device, comprising: Inserting a section of a gas generator (40) through a first slot (35) formed on the airbag (30) to generate gas into an airbag (30); Sealing the first slot (35) on an outer side of the airbag (30) with a sealing element (60), and coupling the sealing element (60) to the airbag (30); and Inserting the gas generator (40) and the airbag (30) into an airbag housing (10) to accommodate the airbag (30) and coupling the gas generator (40) to the airbag housing (10), wherein the airbag (30) is formed with a folded section by folding the airbag (30) such that the airbag (30) is shorter on an upper section thereof than on a lower section thereof, Coupling an upper retaining cable (70) to an inner surface of the upper section of the airbag (30), and Coupling a lower retaining cable (80) to an inner surface of the lower section of the airbag (30), wherein the insertion of the section of the gas generator (40) into the airbag (30) through the first slot (35) comprises the extension of first and second pins (42, 44) through the airbag (30), which project from an outer circumferential surface of the gas generator (40) on the section of the gas generator (40) received in the airbag (30), wherein the coupling of the sealing element (60) to the airbag (30) comprises the extension of the second pin (44) through the sealing element (60), wherein coupling the gas generator (40) to the airbag housing (10) includes coupling the first pin (42) and the second pin (44) to the airbag housing (10), wherein the insertion of the section of the gas generator (40) into the airbag (30) through the first slot (35) comprises extending the first and second pins (42, 44) through a protective element (50) arranged in the airbag (30), wherein the first and second pins (42, 44) project from an outer circumferential surface of the gas generator (40) on the section of the gas generator (40) received in the airbag (30) in order to prevent the airbag (30) from being damaged by the heat of the gas generated by the gas generator (40), where: the protective element (50) is formed with a first through-hole (52) through which the first pin (42) extends, and a second through-hole (54) through which the second pin (44) extends; the airbag (30) is formed with a third through-hole (32) through which the first pin (42) extends, and a fourth through-hole (34) through which the second pin (44) extends; the sealing element (60) is designed with a fifth through-hole (64) through which the second pin (44) extends; and the airbag housing (10) is designed with a first mounting hole (12) into which the first pin (42) is inserted after extending through the first through-hole (52) and the third through-hole (32) to be coupled to the airbag housing (10), and a second mounting hole (14) into which the second pin (44) is inserted after extending through the fourth through-hole (34) and the fifth through-hole (64) to be coupled to the airbag housing (10). wherein the sealing element (60) comprises: a sealing section (61) for sealing the first slot (35), provided that the section of the gas generator (40) has been inserted into the airbag (30) through the first slot (35), wherein the sealing section (61) is formed with a fifth through-hole (64); and an extension section (62) extending from the sealing section (61), wherein the extension section (62) together with the sealing section (61) comprises at least a section of the outer surface of the gas generator (40) arranged outside the airbag (30), wherein the extension section (62) is formed with a second slot (62a) open on one side thereof in order to encompass at least the section of the outer surface of the gas generator (40) which is arranged outside the airbag (30),

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