JP2006188134A - Interior part for vehicle provided with airbag door part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an interior part for a vehicle provided with an airbag door part, in which breakage of an airbag developing tear line is restricted even when pressure is added from the external to an interior part body. <P>SOLUTION: This interior part 1 for a vehicle provided with an airbag door part is provided with the interior part body 3 and a reinforcing member 11 welded on the back surface of it. The reinforcing member 11 comprises a frame member part 15 welded with an outer circumferential part of the airbag door part 9, and flap parts 21 and 23 integrally connected to the frame member part 15 by hinges 29 and 33, and welded with the airbag door part 9. The hinges 29 and 33 comprise rotation action parts 29a and 33a and extending action parts 29b and 33b. On the side of the flap parts 21 and 23 of the rotation action parts 29a and 33a of the hinges 29 and 33, ribs 31 and 35 extended toward the back surface of the airbag door part 9 are integrally provided along the length direction of the hinges 29 and 33. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an interior part for a vehicle with an airbag door portion such as an instrument panel having an airbag door portion that is opened by operation of an airbag device in the event of a vehicle collision.

  In recent years, most vehicles are equipped with an airbag device for ensuring the safety of passengers in the event of a vehicle collision. And this airbag apparatus is generally attached to the back surface side of the instrument panel with an airbag door part. In addition, the instrument panel with an airbag door part includes an instrument panel body provided by being partitioned by an airbag deployment tear line in which the airbag door part does not reach the surface, and an airbag device welded to the back surface thereof. And a reinforcing body made of resin for storage, and the reinforcing body is integrally connected to the frame body portion by a hinge while being welded to the outer peripheral portion of the airbag door portion, and the airbag door portion. It has the structure which has the flap part welded to.

Further, in Patent Document 1, an air bag case for storing an air bag in a folded state and an opening shape for deploying the air bag are determined on the back surface of an interior panel (interior product body) opposite to the opening of the air bag case. A rupture opening portion formed by forming a rupture groove (airbag deployment tear line), and a reinforcing frame that reinforces the back surface of the interior panel corresponding to the rupture opening portion and the peripheral area of the opening and connects the airbag case An automotive airbag device having a body (reinforcing body) is disclosed. In this automobile airbag device, the reinforcing frame body includes a frame main body provided with a locking portion for connecting the air bag case, and a break reinforcing portion (flap portion) for a break opening portion formed integrally with the upper portion of the frame main body. And the edge reinforcement part (frame part) which reinforces the back surface corresponding to the opening peripheral region of a fracture | rupture opening | release part. With this configuration of the reinforcing frame, even if a pressing force is applied from above the interior panel, the edge reinforcing portion of the reinforcing frame supports the interior panel from below, so that the dent of the fracture opening and the deformation of the opening periphery It is described that can be prevented. Further, the break reinforcing portion is formed integrally with the frame body via a hinge portion (hinge) having a wave-like bent portion, and when the airbag device is activated at the time of a vehicle collision, the bent portion of the hinge portion is formed. And the breakage reinforcing portion rotates around the hinge portion, and the airbag is deployed. And it is described that the safety | security of the passenger | crew at the time of a vehicle collision is ensured by this.
JP 2004-66955 A

  By the way, in an instrument panel with an airbag door part, although a frame part and a flap part are welded to the back surface of an instrument panel main body, a hinge is not welded to the back surface of an instrument panel main body. Therefore, the back side of the part of the instrument panel main body corresponding to the position of the hinge is not supported, and if a pressing force is applied to the part from the outside, the airbag deployment tear line may be broken.

  The present invention has been made in view of the above points, and an object of the present invention is to regulate an air bag deployment tear line that breaks even if a pressing force is applied to the interior body from the outside. It is providing the interior goods for vehicles with a bag door part.

  The vehicle interior product with an airbag door part of the present invention that achieves the above object is an interior product body provided by being partitioned by an airbag deployment tear line in which the airbag door part does not reach the surface, and the back surface thereof. A welded resin reinforcing body, wherein the reinforcing body is integrally connected to the frame body portion welded to the outer peripheral portion of the airbag door portion by a hinge. And a flap portion welded to the airbag door portion, and the hinge has a substantially U-shaped cross-section rotating action portion opened on the back side coupled to the frame body portion, An extension action part having a substantially U-shaped cross-section opened on the surface side that is connected to the flap part continuously to the rotation action part, and on the flap part side of the rotation action part of the hinge, A rib extending toward the back surface of the airbag door portion extends along the longitudinal direction of the hinge. And it is provided integrally with Te.

  According to the above configuration, when a pressing force is applied from the outside to a portion of the interior product main body corresponding to the position of the hinge, the rib abuts against and supports the back surface of the portion to resist the pressing force. Therefore, even if a pressing force is applied to the interior body from the outside, the airbag deployment tear line is restricted from breaking.

  Further, in the interior product for a vehicle with an airbag door portion of the present invention, the rib is provided so that the side surface is positioned at the airbag deployment tear line when the airbag door portion is opened by deploying the airbag. It may be.

  According to the above configuration, when the airbag is deployed and the airbag deployment tear line portion corresponding to the base end portion of the airbag door portion is cut and the airbag door portion is opened, the side surfaces of the ribs are When positioned at the position of the bag deployment tear line, they are sandwiched between the cut end of the airbag door portion and the hinge. Therefore, since the hinge is protected by the rib in this way, the hinge is damaged and cut by the cut end, and it does not fly to the passenger side together with the airbag door portion.

  As described above, according to the present invention, even if a pressing force is applied to the interior body from the outside, the airbag deployment tear line is restricted from breaking.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a vehicle interior with an airbag door portion according to the present invention will be described in detail with reference to the drawings, taking an instrument panel with an airbag door portion as an example. In addition, this invention is not limited to embodiment shown below.

  FIG. 1 shows a front part of a passenger seat of an instrument panel 1 with an airbag door. FIG. 2 shows the reinforcing body 11. 3 to 8 show a cross-sectional structure taken along line III-III in FIG. 2 and a cross-sectional structure taken along line VIII-VIII, respectively. FIG. 9 shows the bridge portion 25. FIG.10 and FIG.11 shows the cross-section of the instrument panel 1 with an airbag door part when an airbag expand | deploys. 12 and 13 are cross-sectional views showing steps of forming the reinforcing body 11, and are cross-sectional views corresponding to FIG. 3, respectively. FIG. 14 is a cross-sectional view showing a welding process between the instrument panel main body 3 and the reinforcing body 11, and is a cross-sectional view corresponding to FIG. 1 and 8 is the “vehicle width direction”. The horizontal direction in FIGS. 3 to 7 is the “vehicle body longitudinal direction”. The vertical direction in FIGS. 3 to 7 is the “vehicle body vertical direction”.

  As shown in FIGS. 3 to 7, the instrument panel 1 with an airbag door portion includes an instrument panel main body (interior product main body) 3 and a reinforcing body for storing the airbag device 51 attached to the back surface 3 b side. 11.

  The instrument panel body 3 is a resin molded product that is injection-molded with polypropylene (PP) resin or the like. An air bag deployment tear line 5 that does not reach the front surface 3 a is formed in a “day” shape on the back surface 3 b of the front position of the passenger seat of the instrument panel body 3. As shown in FIG. 1, a pair of horizontally-long rectangular airbag door portions 9 are arranged in the front-rear direction by the section of the airbag deployment tear line 5. Further, a portion of the surface 3 a corresponding to the airbag deployment tear line 5 of the instrument panel main body 3 is a planned fracture portion 7 that is easily broken by the operation of the airbag device 51.

  The reinforcing body 11 is also an injection-molded resin molded product, and the manufacturing method thereof will be described in detail later. The reinforcing body 11 includes a substantially rectangular cylindrical guide portion 13 in which the airbag device 51 is accommodated. The guide portion 13 covers a portion in which a substantially rectangular opening 13a (hereinafter referred to as “shooting port 13a”) on the instrument panel body 3 side is surrounded by the airbag deployment tear line 5 of the instrument panel body 3. It is provided as follows. At the end of the guide portion 13 on the shooting port 13a side, a frame body portion 15 extending continuously outward from the guide portion 13 is provided. The guide portion 13 and the frame body portion 15 are formed of a resin material such as polypropylene (PP) resin containing glass fiber from which a highly rigid molded product can be obtained.

  The guide portion 13 has a plurality of engagement holes 13d (only one is shown in FIG. 4) spaced apart from each other on the front and rear frame walls 13b and 13c, each having a substantially rectangular cylindrical shape. Is formed. And the airbag apparatus 51 is fixed in the state which hook 53 (only one is described in FIG. 4) provided in the side surface engaged with the engaging hole 13d, and was accommodated in the guide part 13. FIG.

  As for the frame part 15, the welding rib 15a is formed in the grid | lattice form on the surface at the side of the instrument panel main body 3. FIG. The guide portion 13 and the frame portion 15 are attached to the outer peripheral portion of the airbag door portion 9 on the back surface 3b of the instrument panel body 3 with the welding rib 15a being vibration welded.

  A stepped portion 37c is formed at an intersecting portion 37 between the guide portion 13 and the frame body portion 15 so that the shooting port 13a expands discontinuously. As shown in FIG. 8, large ribs 37 a with relatively high height and small ribs 37 b with relatively low height are alternately arranged in the longitudinal direction on each of the front side portion and the rear side portion of the stepped portion 37 c. Are formed integrally so as to partition the stepped portion 37c with a space therebetween.

  As shown in FIG. 2, the reinforcing body 11 includes front and rear flap portions 21 and 23 having a horizontally long rectangular shape on the shooting port 13 a side of the guide portion 13. The front side and rear side flap parts 21 and 23 are provided so as to close the shooting port 13a. The front flap portion 21 is molded integrally with the front side portion of the step portion 37 c on the shooting port 13 a side of the guide portion 13 through the front hinge 29. On the other hand, the rear side flap portion 23 is molded integrally with the rear side portion of the step portion 37 c on the shooting port 13 a side of the guide portion 13 via the rear hinge 33. In the front flap portion 21 and the rear flap portion 23, the rear side portion of the former and the front side portion of the latter are connected to each other on both sides via a bridge portion 25. These front and rear flap portions 21 and 23, front and rear hinges 29 and 33, and bridge portion 25 are polyolefin-based thermoplastic elastomer resin materials that are capable of obtaining a high-toughness molded product and are not easily damaged particularly at low temperatures. (TPO) or the like. That is, as for these, the guide part 13 and the frame part 15 are shape | molded by the different resin material.

  The front and rear flap portions 21 and 23 are formed on the surface on the instrument panel body 3 side with the welding ribs 21a and 23a in a lattice shape, while the back surfaces are formed on a flat surface so as not to damage the airbag. Yes. The front and rear flap portions 21 and 23 are attached to the airbag door portion 9 on the back surface 3b of the instrument panel body 3 with the welding ribs 21a and 23a being vibration welded. As shown in FIG. 2, through holes 21 b and 23 b are formed in the left and right sides of each of the front and rear flap portions 21 and 23. The peripheries of these through holes 21b and 23b are formed in annular ridges 21c and 23c projecting toward the instrument panel body 3 side. The annular ridges 21c and 23c are formed to be lower than the welding ribs 21a and 23a.

  The front hinge 29 includes a pivoting action portion 29b having a substantially U-shaped cross-section opened on the back side coupled to the stepped portion 37c of the guide portion 13, and a front side portion of the front flap portion 21 continuous to the pivoting action portion 29b. And an extending action portion 29c having a substantially U-shaped cross section that is open on the front surface side, and is formed in a substantially S-shaped cross section as a whole. On the front flap portion 21 side of the rotating action portion 29 b of the front hinge 29, a front rib 31 of a ridge extending toward the back surface 3 b of the airbag door portion 9 of the instrument panel body 3 is in the longitudinal direction of the front hinge 29. Are formed integrally.

  The rear hinge 33 has a substantially U-shaped rotating action portion 33b opened on the back side coupled to the stepped portion 37c of the guide portion 13, and a rear side of the rear flap portion 23 continuously to the turning action portion 33b. And an extending action portion 33c having a substantially U-shaped cross section that is open on the surface side coupled to the side portion, and is formed in a substantially S-shaped cross section as a whole. On the rear flap portion 23 side of the rotating action portion 33b of the rear hinge 33, a rear rib 35 of the ridge extending toward the back surface 3b of the airbag door portion 9 of the instrument panel body 3 is provided on the rear hinge. It is integrally formed along the longitudinal direction of 33.

  The front and rear hinges 29 and 33 are in a positional relationship facing the front position and the rear position, respectively, of the three airbag deployment tear lines 5 extending in parallel in the left-right direction. As shown in FIG. 11, the front rib 31 is provided such that the side surface is positioned at the airbag deployment tear line 5 at the front position when the airbag door portion 9 is opened by the airbag deployment. Further, as shown in FIG. 11, the rear rib 35 is also provided so that the side surface is positioned at the airbag deployment tear line 5 at the rear position when the airbag door portion 9 is opened by the airbag deployment. The gap between the front flap portion 21 and the rear flap portion 23 is a position corresponding to the airbag deployment tear line 5 at the intermediate position.

  As shown in FIG. 8, a plurality of welding ribs 37d are spaced apart from each other along the longitudinal direction on the base portions 29a, 33a of the front and rear hinges 29, 33 molded integrally with the stepped portion 37c. In this case, the large rib 37a provided in the stepped portion 37c is embedded. That is, the large rib 37a constitutes a support rib that supports the welding rib 37d. This welding rib 37d is attached to the back surface 3b of the instrument panel body 3 by vibration welding.

  As shown in FIG. 9A, the bridge portion 25 is formed in a substantially V-shaped cross section with the center warped on the back side of the thin portion 25a, as shown in FIG. 9A. However, the front and rear flap portions 21 are formed. , 23 are welded to the airbag door portion 9, and the warpage is extended. As shown in FIG. 9B, the back surface is flush with the back surfaces of the front and rear flap portions 21, 23. Yes.

  Next, the airbag deployment operation | movement of this instrument panel 1 with an airbag door part is demonstrated based on FIG.10 and FIG.11.

  First, when the vehicle collides and receives an impact of a certain level or more, the airbag device 51 is activated and the deployment of the airbag is started by the inflator.

  Next, with the deployment of the airbag, as shown in FIG. 10, the extending action portions 29c and 33c having substantially U-shaped cross sections of the front and rear hinges 29 and 33 are extended, and the front and rear flap portions are extended. 21 and 23 are pushed upward, and the bridge portion 25 is cut at the thin portion 25a, and the planned break portion 7 is broken along the airbag deployment tear line 5 so that the airbag door portion 9 becomes the instrument panel body 3. Separated from.

  As the airbag further develops and the airbag jumps out of the opening of the instrument panel body 3, as shown in FIG. 11, the front and rear hinges 29, 33 have a substantially U-shaped cross section. The pivoting action portions 29b and 33b are pivoted outward, and the pair of airbag door portions 9 are opened in a double-spread shape. At this time, the side surface of the front rib 31 is positioned at the position of the airbag deployment tear line 5 and is sandwiched between the cut end of the airbag door portion 9 and the front hinge 29. Further, when the side surface of the rear rib 35 is positioned at the position of the airbag deployment tear line 5, the rear rib 35 is sandwiched between the cut end of the airbag door portion 9 and the rear hinge 33.

  In the case of the instrument panel 1 with an airbag door as described above, when a pressing force is applied from the outside to the part of the instrument panel main body 3 corresponding to the position of the front hinge 29 or the rear hinge 33. The front rib 31 or the rear rib 35 abuts against the back surface of the portion and supports it to resist the pressing force. Therefore, even if a pressing force is applied to the instrument panel body 3 from the outside, it is possible to restrict the airbag deployment tear line 5 from breaking.

  Further, when the airbag is deployed and the airbag deployment tear line 5 corresponding to the base end portion of the airbag door portion 9 is cut and the airbag door portion 9 is opened, the front and rear ribs 31 and 35 are opened. Are positioned at the position of the airbag deployment tear line 5, they are sandwiched between the cut end of the airbag door portion 9 and the front hinge 29 or the rear hinge 33. Therefore, since the front and rear hinges 29 and 33 are protected by the front and rear ribs 31 and 35 in this way, the front hinge 29 or the rear hinge 33 is damaged and cut by the cut ends. The air bag door 9 does not fly to the passenger side.

  Next, the manufacturing method of this instrument panel 1 with an airbag door part is demonstrated.

<Instrument panel body molding process>
The instrument panel body 3 is molded by injection molding, in which pellet-shaped polypropylene (PP) resin or the like is put into a hopper of an injection molding machine, melted while screw kneading in a cylinder, and injected from a gate to a mold. To do.

  In the molded instrument panel main body 3, an airbag deployment tear line 5 that does not reach the front surface 3 a is formed on the rear surface 3 b at the front passenger seat position, thereby forming an airbag door portion 9.

<Reinforcement molding process>
The reinforcing body 11 is also formed by injection molding. However, since the guide portion 13 and the front and rear flap portions 21 and 23 are formed of different resin materials, the two-stage step including the first and second molding steps is performed. Molded by injection molding.

-First molding step-
The guide part 13 and the frame part 15 of the reinforcing body 11 are filled with a glass fiber-filled polypropylene (PP) resin or the like that can obtain a highly rigid molded product in the hopper of an injection molding machine, and screwed in the cylinder. Injection molding in which the molten resin is injected from the gate into a cavity formed between the cavity mold 71 and the core mold 72 of the first mold 70 as shown in FIG. To form a single piece.

  In the molded guide part 13 and the frame part 15, a step part 37 c, a large rib 37 a and a small rib 37 b are formed at the intersecting part 37.

-Second molding step-
The front and rear flap portions 21 and 23 of the reinforcing body 11 and the front and rear hinges 29 and 33 are formed into a pellet-like polyolefin-based thermoplastic elastomer resin (from which a tough molded product is obtained in a hopper of an injection molding machine ( TPO) and the like are introduced and melted while screw kneading in the cylinder. As shown in FIG. 13, the guide part 13 and the frame part 15 formed in the first forming step are set in the core mold 63 in advance. The molten resin is injected from the gate into the cavity formed between the cavity mold 61 of the two molds 60 and the core mold 63, the guide portion 13 set on the core die 63, and the frame body portion 15. The whole is molded integrally by injection molding. In the molded front and rear flap portions 21 and 23 and the front and rear hinges 29 and 33, the front and rear hinges 29 and 33 are formed on the stepped portion 37 c of the intersection portion 37 of the guide portion 13 and the frame body portion 15. 33 is formed integrally and a welding rib 37d in which a large rib 37a is embedded is formed.

<Welding process>
As shown in FIG. 14, the instrument panel main body 3 is set on the base 73, the reinforcing body 11 is set on the vibration welding jig 74, and the outer periphery of the airbag door portion 9 on the back surface 3 b of the instrument panel main body 3. While positioning the frame body part 15 of the reinforcing body 11 at the part, the front and rear flap parts 21 and 23 are positioned on the airbag door part 9. Then, the reinforcing body 11 is pressed against the instrument panel main body 3 using the vibration welding jig 74 and vibrated in the lateral direction 75 at a high frequency, whereby the reinforcing body 11 is instrumented by the welding ribs 15a, 21a, 23a, and 37d. It is welded to the ment panel body 3. At this time, since the large rib 37a is embedded in the welding rib 37d, the welding rib 37d is pressed against the instrument panel body 3 with high accuracy without being deformed, and is reliably welded. The front and rear flap portions 21, 23 are welded to the airbag door portion 9, so that the warpage of the bridge portion 25 is extended, and as shown in FIG. The rear flap portions 21 and 23 are flush with the back surfaces of the rear flap portions 21 and 23, so that the airbag device 51 does not become an obstacle. Further, since the peripheral edges of the through holes 21b and 23b on the surface side of the front and rear flap portions 21 and 23 are formed in the annular ridges 21c and 23c, burrs generated by the welding of the welding ribs 21a and 23a are formed in the through holes. It can prevent falling to the back surface side in which the airbag apparatus 51 was provided through 21b, 23b. Moreover, since the annular ridges 21c and 23c are formed to be lower than the welding ribs 21a and 23a, they do not become an obstacle when the front and rear flap portions 21 and 23 are welded to the airbag door portion 9. .

In the embodiment described above, the instrument panel 1 with an airbag door part is given as an example of the vehicle interior part with an airbag door part. It may be a vehicle interior product,
Further, in the above-described embodiment, the airbag deployment tear line 5 is formed in a “day” shape, and a pair of horizontally long rectangular airbag door portions 9 are vertically moved by the section of the airbag deployment tear line 5. However, the present invention is not limited to this. As shown in FIG. 13, the airbag deployment tear line 5 is formed in the shape of a "mouth". A configuration may be adopted in which a single horizontally-long rectangular airbag door portion 9 is arranged by a section of the deployment tear line 5.

  Moreover, in the said embodiment, although it was set as the instrument panel main body 3 of the resin single layer, it is not limited to this in particular, It was coat | covered integrally by the resin-made base materials and its surface side shape | molded with resin etc. It may have a two-layer structure consisting of a resin skin.

  Moreover, in the said embodiment, although it was set as two flap parts, the front side and the rear side flap parts 21 and 23, it is not limited to this in particular, You may have a 3 or more flap part. . For example, a front flap part, a central flap part, and a rear flap part are provided, the front flap part and the central flap part are connected via a bridge part, and the central flap part and the rear flap part are connected. The structure connected via the bridge part may be sufficient.

  Moreover, in the said embodiment, although the reinforcement body 11 shall be comprised with the cylindrical guide part 13 and the frame part 15, it is not limited to this in particular, A reinforcement body does not have a guide part, The frame of the airbag device may be configured as a guide portion.

  As described above, the present invention is useful for vehicle interior parts with an airbag door portion such as an instrument panel having an airbag door portion that is opened by the operation of an airbag device in the event of a vehicle collision.

It is a partial perspective view of an instrument panel with an airbag door part. 2 is a front view of a reinforcing body 11. FIG. It is sectional drawing along the III-III line in FIG. It is sectional drawing along the IV-IV line in FIG. It is sectional drawing along the VV line in FIG. It is sectional drawing along the VI-VI line in FIG. It is sectional drawing along the VII-VII line in FIG. It is sectional drawing along the VIII-VIII line in FIG. It is an enlarged view of a bridge part. It is explanatory drawing which shows the expansion | deployment initial stage process of an airbag. It is explanatory drawing which shows the expansion | deployment final stage process of an airbag. It is a shaping | molding die sectional drawing of the cross section corresponding to FIG. 3 which shows the 1st shaping | molding step of the reinforcement body 11. FIG. FIG. 4 is a cross-sectional view of a mold corresponding to FIG. 3 illustrating a second forming step of the reinforcing body 11. It is a welding jig sectional view of the section corresponding to Drawing 3 showing the welding process of instrument panel main part 3 and reinforcement object 11. It is a partial perspective view of the instrument panel with an airbag door part of other embodiment.

Explanation of symbols

1 Instrument panel with airbag door (vehicle interior with airbag door)
3 Instrument panel body (interior product body)
3a Front surface 3b Back surface 5 Air bag deployment tear line 9 Air bag door portion 11 Reinforcing body 15 Frame body portion 21 Front side flap portion (flap portion)
23 Rear flap (flap)
29 Front hinge 29b Rotating action part 29c Extending action part 31 Front rib (rib)
33 Rear hinge 33b Rotating action part 33c Extending action part 35 Rear rib (rib)

Claims (2)

A vehicle with an airbag door portion, comprising: an interior product body provided by being partitioned by an airbag deployment tear line where the airbag door portion does not reach the surface; and a resin reinforcing body welded to the back surface Interior parts for
The reinforcement body includes a frame body portion welded to an outer peripheral portion of the airbag door portion, a flap portion welded to the airbag door portion and integrally connected to the frame body portion by a hinge. Have
The hinge has a substantially U-shaped rotating action part opened on the back surface side coupled to the frame body part, and a substantially sectional view opened on the front surface side joined to the flap part continuously to the turning action part. A U-shaped extending action part,
An airbag door characterized in that a rib extending toward the back surface of the airbag door portion is integrally provided along the longitudinal direction of the hinge on the flap portion side of the pivot action portion of the hinge. Interior parts for vehicles with parts. 2. The vehicle with an airbag door part according to claim 1, wherein the rib is provided such that a side surface thereof is positioned at the airbag deployment tear line when the airbag door part is opened by airbag deployment. 3. Interior products.

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