JP2009056844A - Vehicular knee airbag device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure the required rigidity of a glove door while suppressing the increase of the mass of the glove door and the deterioration of the space efficiency of the glove box. <P>SOLUTION: The glove door 20 is constituted by heat-fusing a glove door outer 24 and a glove door inner 26 which are formed of resin. Resin ribs 34 which can store an airbag case 44 accommodating an airbag module 42 are formed integrally on the glove door inner 26. Tips of the resin ribs 34 are heat-fused to the bottom wall 44A of the airbag case 44. End at the open side of the airbag case 44 are heat-fused to the vehicular front surface of the glove door outer 24. Therefore, the rigidity of the glove door 20 can be enhanced compared with the glove door which has not such a structure. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicle knee airbag device that restrains an occupant's knees by inflating and deploying a knee airbag at the time of a collision.

In recent years, from the viewpoint of improving occupant protection performance at the time of a collision, a knee airbag device for a vehicle that restrains the occupant's knee by inflating and deploying a knee airbag at the time of a collision is being installed. Patent Documents 1 and 2 below disclose an example of this type of vehicle knee airbag device. Briefly described, in the prior art disclosed in these patent documents, a knee airbag device is built in a grab door of a grab box provided in an instrument panel.
DE 4209604 US Pat. No. 6,276,713

  Here, when the knee airbag device is built in the grab door as in the technology disclosed in the above prior art, the reaction force when the knee airbag is deployed and the knee airbag is applied when the knee of the occupant is received. The grab door is required to have sufficient rigidity to withstand the pressing force. For this reason, as an example, an airbag case that accommodates a knee airbag module composed of a folded knee airbag or the like is made of sheet metal, and the sheet metal airbag case is arranged in the grab door and the thickness and shape of the airbag case are arranged. It is conceivable to devise and fix the airbag case by fastening it with the door inner of the grab door.

  However, if the airbag case is made of sheet metal, the mass of the grab door increases, and a large operating force is required when the grab door is opened and closed (in the case of a damper structure, the damper force needs to be increased). Further, when the thickness of the grab door is increased, the storage space for the grab box is reduced, and the space efficiency is lowered.

  In view of the above facts, an object of the present invention is to provide a knee airbag device for a vehicle that can ensure the required rigidity of the grab door while suppressing an increase in the mass of the grab door and a decrease in space efficiency of the grab box.

  A knee airbag device for a vehicle according to the invention of claim 1 is made of a resin material, and includes a grab door outer constituting an outer plate of a grab door that opens and closes a grab box body provided at a predetermined position of the instrument panel. In addition to the resin material or the metal material, the grab door inner plate is arranged on the opening side of the grab box body and integrated with the grab door outer, and the resin material. In addition, a knee airbag that is interposed between the grab door outer and the grab door inner, is folded at least when not colliding, and is inflated and deployed to the occupant's knee side at the time of collision, and is fixed to the grab door outer by welding. And an airbag case.

  According to a second aspect of the present invention, in the vehicle knee airbag device according to the first aspect, the grab door inner is also made of a resin material, and the grab door inner is welded to the airbag case and the grab door outer. It is characterized by being connected to each other.

  According to a third aspect of the present invention, in the knee airbag device for a vehicle according to the second aspect, the resin rib extending from the grab door inner toward the grab door outer side and the grab door outer toward the grab door inner side. At least one of the resin ribs extending toward the surface is provided, and the grab door inner and the grab door outer are connected to each other through the resin rib.

  According to a fourth aspect of the present invention, in the vehicle knee airbag device according to the third aspect, the resin rib is provided at a position not overlapping with a bottom wall portion of the airbag case in a front view of the grab door, and the grab door outer and the grab A first rib that couples the door inner; a second rib that is provided at a position overlapping the bottom wall portion of the airbag case in front view of the grab door and that couples the grab door inner and the bottom wall portion of the airbag case; It is characterized by including.

  According to the first aspect of the present invention, the grab box body is provided at a predetermined position of the instrument panel, and the grab box body can be opened and closed by the grab door.

  Here, the grab door includes a grab door outer made of a resin material and a grab door inner made of a resin material or a metal material, and at least an air bag containing a folded knee airbag. A bag case is interposed. The airbag case is made of a resin material and is fixed to the grab door outer by welding. Therefore, since the airbag case is added as a kind of reinforcing material to the grab door outer constituting the outer plate of the grab door, the rigidity of the grab door is increased. Therefore, it is possible to support the deployment reaction force when the knee airbag is deployed and the pressing force applied when the knee airbag receives the occupant's knee by the grab door and, by extension, the instrument panel. That is, in this way, the required rigidity of the grab door can be ensured.

  Further, since at least the grab door outer and the airbag case are made of resin, an increase in mass is also suppressed as compared to the case where a part or all of these are made of metal. In addition, the airbag case built in the grab door and the grab door outer are both made of resin, and both are integrated by welding to increase the rigidity of the grab door, so the airbag case is made of a thick steel plate Compared to the case, the thickness of the grab door does not increase.

  According to the second aspect of the present invention, the grab door inner is also made of a resin material, and the grab door inner is connected to the airbag case and the grab door outer by welding. The airbag case and the grab door inner are all joined together by welding. Therefore, the binding force of the three parties is increased, and as a result, the rigidity of the grab door is also increased.

  According to the third aspect of the present invention, at least one of a resin rib extending from the grab door inner toward the grab door outer side and a resin rib extending from the grab door outer toward the grab door inner side. Since the grab door inner and the grab door outer are connected to each other through the resin rib, the grab door is further reinforced by the resin rib and the rigidity is increased.

  In addition, since the resin rib can be formed integrally with the grab door inner and the grab door outer at the same time, manufacturing is easy.

  According to the fourth aspect of the present invention, the resin rib is provided at a position where the resin rib does not overlap with the bottom wall portion of the airbag case when viewed from the front of the grab door, and the bottom wall portion of the airbag case when viewed from the front of the grab door. A second rib provided in an overlapping position, the grab door outer and the grab door inner are coupled by the first rib, and the grab door inner and the bottom wall portion of the airbag case are coupled by the second rib. Therefore, the coupling force between the three members of the grab door inner, the grab door outer, and the airbag case is enhanced.

  As described above, the knee airbag device for a vehicle according to the first aspect of the present invention can ensure the necessary rigidity of the grab door while suppressing an increase in the mass of the grab door and a decrease in the space efficiency of the grab box. It has an excellent effect.

  The knee airbag device for a vehicle according to the second aspect of the present invention has an excellent effect that the rigidity of the grab door can be further increased.

  The knee airbag device for a vehicle according to the present invention described in claim 3 has an excellent effect that the rigidity of the grab door can be further increased by a simple and easy manufacturing method.

  The knee airbag device for a vehicle according to the present invention described in claim 4 has an excellent effect that the rigidity of the grab door can be improved in a well-balanced manner.

  Hereinafter, an embodiment of a vehicle knee airbag device according to the present invention will be described with reference to FIGS. In these drawings, an arrow FR appropriately shown indicates the vehicle front side, an arrow UP indicates the vehicle upper side, and an arrow IN indicates the vehicle width direction inner side.

  FIG. 1 is a longitudinal sectional view showing an overall configuration in an assembled state of a glove door built-in type knee airbag device according to the present embodiment. FIG. 2 is an exploded perspective view of the grab door. Further, FIG. 3 shows an external perspective view of an instrument panel on which a glove door built-in type knee airbag device is mounted. FIG. 4 is a longitudinal sectional view showing a state in which the knee airbag device with the built-in grab door shown in FIG. 1 is activated and the knee airbag is deployed.

  As shown in FIG. 3, the position facing the passenger's knee on the passenger seat side of the instrument panel 10 (more precisely, the upper part of the instrument panel lower 12 constituting the lower part of the instrument panel 10), A grab box 14 is provided for storing small items. As shown in FIG. 1, the grab box 14 includes a resin-made grab box body 16 formed in a box shape, and a grab door 20 that opens and closes an opening 18 of the grab box body 16.

  The grab box body 16 is arranged so that the opening 18 faces the vehicle rear side (vehicle interior side), and includes a bottom wall portion (front wall portion) 16A, an upper wall portion 16B, a lower wall portion 16C, It is comprised by a pair of side wall part 16D. The front and rear length of the lower wall portion 16C is set to be shorter than the front and rear length of the upper wall portion 16B, whereby the opening 18 of the grab box body 16 has an instrument panel upper 22 (upper part of the instrument panel 10). 3) and a design surface (rounded curved surface) having continuity with the instrument panel lower 12 following this.

  As shown in FIGS. 1 and 2, the grab door 20 that closes the opening 18 of the above-described grab box body 16 includes a resin-made grab door outer 24 that is arranged on the vehicle interior side and forms a design surface. A resin grab door inner 26 that is disposed on the vehicle front side of the grab door outer 24 and integrated with the grab door outer 24 forms an outer shell.

  The grab door outer 24 is formed in a substantially rectangular tray shape. More specifically, the grab door outer 24 is composed of a generally rectangular flat plate-shaped grab door outer general part 24A constituting a design surface, and a grab door outer peripheral wall part raised from the four outer peripheral sides of the grab door outer general part 24A. 24B. Further, on the back surface side of the grab door outer general portion 24A (the front surface of the vehicle facing the grab door inner 26), there is a fracture portion (tier line) 28 set in an H shape when viewed from the grab box body 16 side. Is formed. The breaking portion 28 is configured as a thin portion, and when the bag deployment pressure acting on the breaking portion 28 reaches a predetermined value, the grab door outer general portion 24A breaks along the breaking portion 28 and the airbag door 30 (see FIG. 4) is developed so as to be opened both vertically and vertically. As in the case of the grab door 20, the rupture part may be configured by an invisible type in which the rupture part 28 is not visible from the outside (occupant side), or the grab door general part is thinned from both the front and back sides to make the exterior (occupant) The rupture portion may be constituted by a visible type in which the rupture portion is visible from the side.

  On the other hand, the grab door inner 26 is also formed in a tray shape having a size that can be fitted to the grab door outer 24. Accordingly, the grab door inner 26, like the grab door outer 24, has a generally rectangular flat plate-like grab door inner general part 26A arranged substantially parallel to the grab door outer general part 24A, and the grab door inner general part. And a grab door inner peripheral wall portion 26B raised from the outer peripheral four sides of 26A. Note that the bottom of the grab door inner 26 is formed deeper than the grab door outer 24. Further, the upper wall portion 26B ′ of the grab door inner peripheral wall portion 26B swells in a substantially semicircular shape toward the front side of the vehicle in a side view, and the indoor side of the upper wall portion 16B of the grab box main body 16 corresponding to this. A concave portion 32 that can receive the upper wall portion 26B ′ of the grab door inner peripheral wall portion 26B is formed at the end portion. The upper wall portion 26B ′ of the grab door inner peripheral wall portion 26B and the concave portion 32 are the load input direction at the time of collision (that is, the direction of the reaction force of the deployment reaction force when the knee airbag 46 described later is deployed) It is also the direction which presses knee airbag 46.) It is arranged so that it may overlap.

  Further, inside the above-described grab door inner 26, reinforcing resin ribs 34 formed in a narrow plate shape are integrally formed over a plurality of upper and lower stages. Each resin rib 34 is formed so as to be bridged between the left and right side walls of the grab door inner peripheral wall portion 26B, and is also connected to the grab door inner general portion 26A. Therefore, the resin rib 34 is configured to be connected to the inner side surface of the grab door inner 26 at three outer peripheral sides. However, since the height of the resin rib 34 is set to be higher than the depth (depth) of the grab door inner 26, the tip end portion of the resin rib 34 is arranged in a state protruding from the grab door inner peripheral wall portion 26B by a predetermined length. Has been.

  Among the resin ribs 34, the uppermost stage, the two resin ribs 34A arranged at the lower stage, and the resin rib 34B arranged at the lowermost stage are set at the same height. The resin rib 34 </ b> C disposed in the shape has a shape in which an intermediate portion is cut into a rectangular shape, leaving both end portions. As a result, a concave portion 36 is formed in the central portion of the resin rib 34C. The recess 36 has a substantially rectangular shape in plan view and a depth (depth) set to a predetermined depth (depth dimension). The resin ribs 34A and 34B arranged above and below the grab door inner 26 correspond to the first rib in the present invention, and the resin rib 34C arranged in the middle part of the grab door inner 26 and formed with the recess 36 is the main rib. This corresponds to the second rib in the invention.

  An airbag module 42 of a knee airbag device 40 with a built-in grab door is disposed in the recess 36. A knee airbag device 40 with a built-in grab door is constituted by the airbag door 30 and the airbag module 42 described above.

  The airbag module 42 is disposed on the upper end side of the airbag case 44, a resin airbag case 44 formed in a box shape, a knee airbag 46 stored in a folded state in the airbag case 44, and the airbag case 44. The cylindrical inflator 48 is configured as a main part. In the knee airbag device 40 with a built-in grab door, the knee airbag 46 is folded by roll folding. However, the knee airbag 46 may be folded by bellows folding, or may be folded in combination. Further, in the knee airbag device 40 with a built-in grab door, the inflator 48, which is an element grasped as gas generating means in a broad sense, is arranged on the upper end side in the airbag case 44, but not limited thereto, The inflator may be arranged at the lower end side in the airbag case 44 or at the middle in the vertical direction. Further, the inflator is installed outside the grab door so that the inflator and the knee airbag 46 are communicated with each other by a tube or the like. May be.

  The airbag case 44 includes a rectangular flat bottom wall portion 44A, an upper wall portion 44B, a lower wall portion 44C, and left and right side wall portions 44D. As shown in FIG. 1, in a state where the airbag case 44 is housed in the recess 36 of the grab door inner 26, the bottom wall portion 44A of the airbag case 44 abuts against the central bottom portion 34C ′ of the resin rib 34C, The dimensions of the respective parts are set so that the front end portions of the wall portion 44B, the lower wall portion 44C, and the left and right side wall portions 44D abut on the grab door outer general portion 24A.

  And in this embodiment, each front-end | tip part of the upper wall part 44B of the airbag case 44, the lower wall part 44C, and the right-and-left side wall part 44D is heat-welded to the vehicle front side surface of the grab door outer 24 ( This heat welded portion is referred to as “first heat welded portion 50” and is shown in FIG. 1), and the bottom wall portion 44A is heat welded to the center bottom portion 34C ′ of the resin rib 34C of the grab door inner 26. (This heat-welded portion is referred to as “second heat-welded portion 52” and is shown in FIG. 1). Further, the tip ends of the upper and lower resin ribs 34A and 34B of the grab door inner 26 are thermally welded to the front surface of the grab door outer 24 (this heat welded portion is referred to as “third heat welded portion 54”). And is shown in FIG. Further, the grab door inner peripheral wall portion 26B is thermally welded to the grab door outer peripheral wall portion 24B (this heat weld portion is referred to as “fourth heat weld portion 56” and is shown in FIG. 1).

  Supplementally, a release knob (not shown) is provided on the upper edge side of the grab door 20, and an engagement with a lock mechanism (not shown) provided on the opening 18 side of the grab box body 16 when the occupant operates with a finger. The combined state is released, and the urging force of an urging means such as a spring (not shown) is rotated (opened) around the lower end portion toward the indoor side.

(Operation and effect of this embodiment)
Next, the operation and effect of this embodiment will be described.

  When a vehicle equipped with the above-configured glove door built-in knee airbag device 40 collides with the front, the state is detected by a collision detection means (not shown), and a detection signal is output to the airbag ECU. When the airbag ECU determines that the airbag is activated, various airbag devices on the driver's seat side are activated, and the knee airbag device 40 with a built-in grab door on the passenger seat side is also activated. That is, a predetermined current is applied to the squib of the inflator 48 of the airbag module 42 built in the grab door 20 to operate the inflator 48. Thereby, gas is generated from the inflator 48, and the gas is supplied into the knee airbag 46 stored in the grab door 20 in a folded state, and is inflated.

  Since the front end portions of the peripheral wall portions (the upper wall portion 44B and the lower wall portion 44C and the left and right side wall portions 44D) of the airbag case 44 are thermally welded to the front surface of the grab door outer 24, the knee airbag 46 is provided. The expansion pressure acts on the grab door outer 24 without loss, and the grab door outer general part 24A is quickly broken along the fractured part 28. As a result, as shown in FIG. 4, the airbag door 30 is deployed up and down, and the knee airbag 46 is inflated and deployed between the instrument panel 10 and the knees of the occupant. Both knees are restrained and protected.

  Here, in the knee airbag device 40 with a built-in grab door according to the present embodiment, the grab door 20 has a front and rear divided structure, and the airbag case 44 of the airbag module 42 built between the two is a grab door. Since the outer body 24 is thermally welded and integrated, the rigidity of the grab door outer 24 is increased. That is, since the airbag case 44 is added as a kind of reinforcing material to the grab door outer 24 constituting the outer plate of the grab door 20, the rigidity of the grab door outer 24 is increased. Therefore, the reaction force when the knee airbag 46 is deployed and the pressing force applied when the knee airbag 46 receives the occupant's knee can be supported by the grab door 20. That is, if it does in this way, the required rigidity of the grab door 20 is securable. The load received by the grab door 20 is transmitted to and supported by the instrument panel 10 via the grab box body 16. Supplementally, the load may be supported only by the instrument panel 10 or on the body elements (for example, instrument panel reinforcement, instrument panel bracket, cowl toe bracket, etc.) arranged around the instrument panel 10. It may be transmitted and supported on both the instrument panel 10 and the body side.

  Moreover, in this embodiment, since both the grab door outer 24 and the airbag case 44 are made of resin, an increase in the mass of the entire grab door 20 is also suppressed. Further, since the airbag case 44 and the grab door outer 24 built in the grab door 20 are both made of resin and integrated by thermal welding, the rigidity of the grab door 20 is increased. Compared with the case where is formed of a thick iron plate, the thickness of the grab door 20 (the thickness of the grab door 20 in the vehicle front-rear direction) is not increased, and the capacity of the grab box 14 is not reduced.

  As described above, according to the knee airbag device 40 with a built-in grab door according to the present embodiment, it is possible to ensure the necessary rigidity of the grab door 20 while suppressing an increase in mass of the grab door 20 and a decrease in space efficiency of the grab box 14. it can.

  In the present embodiment, in addition to the grab door outer 24 and the airbag case 44, the grab door inner 26 is also made of a resin material, and the grab door inner 26 is formed of the bottom wall portion 44 </ b> A of the airbag case 44 and the grab door outer 24. Since the grab door outer general portion 24A and the grab door outer peripheral wall portion 24B are joined by thermal welding, the joint force of the grab door outer 24, the grab door inner 26, and the airbag case 44 is increased. Therefore, the rigidity of the grab door 20 can be further increased.

  Furthermore, in the present embodiment, resin ribs (lateral ribs) 34 that extend horizontally from the grab door inner 26 side toward the grab door outer 24 side are integrally formed on the grab door inner 26 side in a plurality of upper and lower stages. In addition, since the grab door inner 26 and the grab door outer 24 are coupled to each other via the resin rib 34, the grab door 20 is further reinforced by the resin rib 34 and the rigidity is increased.

  In addition, since the resin rib 34 can be formed simultaneously with the grab door inner 26 and the grab door outer 24, it is easy to manufacture.

  As a result, according to this embodiment, the rigidity of the grab door 20 can be further increased by a simple and easy-to-manufacture method.

  Furthermore, in this embodiment, resin ribs 34A and 34B provided at positions that do not overlap the bottom wall 44A of the airbag case 44 in the front view of the grab door among the resin ribs 34 provided in a plurality of upper and lower stages, and the front of the grab door It includes a resin rib 34B provided at a position overlapping the bottom wall portion 44A of the airbag case 44 as viewed, and the grab door outer 24 and the grab door inner 26 are coupled by the former resin ribs 34A, 34B. Since the grab door inner 26 and the bottom wall portion 44A of the airbag case 44 are joined by the latter resin rib 34C, the number, plate thickness, pitch, etc. of these resin ribs 34A, 34B, 34C are adjusted. By doing so, the coupling force between the three members of the grab door inner 26, the grab door outer 24, and the airbag case 44 is further effective. It can be increased to. As a result, according to the present embodiment, the rigidity of the grab door 20 can be improved in a well-balanced manner.

[Supplementary explanation of the above embodiment]
(1) In the above-described embodiment, it has been described that the knee airbag device 10 with a built-in grab door operates at the time of a frontal collision. However, the present invention is not limited to this, and a collision prediction means such as a pre-crash sensor is mounted on the vehicle. When a collision is predicted by the collision predicting means, a grab door built-in type knee airbag device may be operated. In other words, “at the time of collision” described in claim 1 includes not only actual collision time but also collision prediction time.

  (2) In the above-described embodiment, the grab door outer 24, the grab door inner 26, and the airbag case 44 are all made of resin. However, the present invention is not limited to this, and other methods may be used.

  For example, in the embodiment shown in FIG. 5, the grab door 64 is configured by screwing a resin grab door outer 60 and a metal grab door inner 62 (fastening points are indicated by a one-dot chain line P). Yes. Further, a metal rib 65 manufactured separately is welded to the inside of the grab door inner 62 at a position corresponding to the resin rib 34 of the above-described embodiment.

  The airbag case 44 built in the grab door 64 having the above-described configuration is configured in the same manner as in the above-described embodiment. Therefore, the airbag case 44 is made of resin, and is joined and integrated with the surface of the grab door outer 60 on the vehicle front side by heat welding. On the other hand, the length of the rib 65 is set so that the bottom wall portion 44A of the airbag case 44 and the rib 65 of the grab door outer 60 which are different materials are in contact with each other (may be close to each other). . Therefore, the bottom wall portion 44A of the airbag case 44 and the rib 65 of the grab door outer 60 are not joined. Even with the above-described configuration, it is possible to ensure rigidity sufficient to support the reaction force when the knee airbag 46 is deployed and the pressing force applied when the knee airbag 46 receives the occupant's knee.

  (3) In the present embodiment described above, the resin rib 34 is set only on the grab door inner 26 side. However, the present invention is not limited to this, and the resin rib is set in a portion outside the range where the airbag case is attached in the grab door outer. Alternatively, the resin ribs may be distributed and provided on both the grab door inner and the grab door outer.

  (4) In the above-described embodiment, the resin rib 34 is configured as a lateral rib whose longitudinal direction is the vehicle width direction, but is not limited thereto, and is a rib extending along the thickness direction of the grab door 20. It suffices to use only vertical ribs whose longitudinal direction is the vehicle up-down direction, or a combination of horizontal ribs and vertical ribs may set, for example, lattice-like ribs.

  (5) To supplement the term “built-in” in the case of the knee airbag device 40 with built-in grab door according to the present embodiment, all the main components of the knee airbag device are arranged inside the grab door 20. It is not necessary to be included, and at least the knee airbag is included in the “built-in” if it is disposed inside the grab door. Therefore, as described above, after connecting the inflator and the knee airbag with a communication means such as a hose, the inflator is provided on the grab box body 16 side, the instrument panel 10 side, the body such as instrument panel reinforcement, etc. Or may be provided in equipment such as an air conditioner unit.

  (6) In the present embodiment described above, the resin rib 34, the grab door outer 24, and the bottom wall portion 44A of the airbag case 44 are thermally welded, and the grab door outer peripheral wall portion 24B and the grab door inner peripheral wall portion 26B are connected. Although the structure which carries out heat welding was taken, not only heat welding but vibration welding or ultrasonic welding may be used.

It is a longitudinal cross-sectional view which shows the whole structure in the assembly | attachment state of the knee airbag apparatus with a built-in grab door which concerns on this embodiment. FIG. 2 is an exploded perspective view of the grab door shown in FIG. 1. 1 is an external perspective view of an instrument panel on which a grab door built-in type knee airbag device is mounted. FIG. 2 is a longitudinal sectional view of a state in which the knee airbag device with the built-in grab door shown in FIG. 1 is activated and the knee airbag is deployed. It is a longitudinal cross-sectional view corresponding to FIG. 1 which shows another embodiment of a grab door.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Instrument panel 14 Grab box 16 Grab box main body 18 Opening part 20 Grab door 24 Grab door outer 26 Grab door inner 34 Resin rib 34A Resin rib (1st rib)
34B Resin rib (first rib)
34C Resin rib (second rib)
40 Knee airbag device with built-in grab door (vehicle knee airbag device)
44 Airbag Case 46 Knee Airbag 50 First Thermal Welding Portion 52 Second Thermal Welding Portion 54 Third Thermal Welding Portion 56 Fourth Thermal Welding Portion 60 Grab Door Outer 62 Grab Door Inner 64 Grab Door

Claims (4)

A grab door outer that constitutes an outer plate of a grab door that opens and closes a grab box body provided at a predetermined position of the instrument panel, and is constituted by a resin material,
A grab door inner that is constituted by a resin material or a metal material, is arranged on the opening side of the grab box body to constitute an inner plate of the grab door, and is integrated with the grab door outer;
A knee air bag that is made of a resin material and is interposed between the grab door outer and the grab door inner and that is folded at least at the time of non-collision and inflated and deployed to the occupant's knee side at the time of collision. An airbag case fixed to the outer by welding;
A vehicle knee airbag device comprising: The grab door inner is also made of a resin material,
The grab door inner is connected to the airbag case and the grab door outer by welding,
The vehicle knee airbag device according to claim 1. It comprises at least one of a resin rib extending from the grab door inner toward the grab door outer side and a resin rib extending from the grab door outer toward the grab door inner side,
The grab door inner and the grab door outer are coupled to each other through the resin rib.
The vehicle knee airbag device according to claim 2. The resin rib is provided at a position that does not overlap the bottom wall portion of the airbag case when viewed from the front of the grab door and connects the grab door outer and the grab door inner, and the resin rib of the airbag case when viewed from the front of the grab door A second rib that is provided at a position overlapping with the bottom wall portion and connects the grab door inner and the bottom wall portion of the airbag case; and
The knee airbag device for a vehicle according to claim 3.

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