JP2012131357A - Airbag door - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent scattering of the skin of the skin side rupture expected line periphery, in opening operation of an airbag door.SOLUTION: This airbag door is divided into four divisions of a front side main door part 31a, a rear side main door part 31b and both-side sub-door parts 31c by a base material central rupture expected line 29e and a skin central rupture expected line 7d extending in a substantially straight liner shape in the vehicle width direction, and front-rear base material side rupture expected lines 29f and skin side rupture expected lines 7e respectively extending in a substantially V shape in the vehicle body longitudinal oblique outward direction from both ends in the vehicle width direction of the central rupture expected lines 29e and 7d. The skin central rupture expected line 7d and the base material central rupture expected line 29e overlap each other by sandwiching a foaming resin layer 5. The front-rear skin side rupture expected lines 7e are positioned between the front-rear base material side rupture expected lines 29f, and are displaced from the base material side rupture expected lines 29f in the vehicle body longitudinal direction by sandwiching the foaming resin layer 5. An angle θ1 formed by the front-rear skin side rupture expected lines 7e is set smaller than an angle θ2 formed by the front-rear base material side rupture expected lines 29f.

Description

  The present invention relates to a four-way opening type air bag door formed on a vehicle instrument panel.

  Patent Document 1 discloses an airbag door formed on a vehicle instrument panel having a three-layer structure in which a base material, a foamed resin layer, and a skin are laminated in this order. This airbag door is a four-way opening that has less resistance when opening and has less adverse effect on the deployment speed of the airbag than the single-open or double-fold type, and has a front main door and a rear main door. And the sub-doors on both sides are divided into four sections with planned failure lines.

  This planned fracture line is formed on both the substrate and the skin. Specifically, the planned fracture line includes a base material central fracture schedule line and a skin center fracture planned line extending substantially linearly in the vehicle width direction, and diagonally outward from the vehicle longitudinal direction from both ends of the central fracture planned line in the vehicle width direction. It consists of a base material side planned break line and a skin side fracture planned line before and after each extending substantially in a V shape, and the skin center planned fracture line and the base material central planned break line are mutually connected with a foamed resin layer interposed therebetween. The upper and lower skin side rupture lines and the upper and lower base material side rupture lines overlap with each other with the foamed resin layer interposed therebetween.

  The airbag door is operated by the airbag apparatus, and the base material center fracture planned line, the skin center fracture planned line, the base material side fracture planned line and the skin side fracture planned line are broken, and the main door portion and both Each of the sub doors is opened, and the airbag is deployed from the substantially rectangular airbag discharge opening to inflate into the vehicle interior.

  In particular, in Patent Document 1, the planned skin side fracture line extends beyond the hinge portion to the outside of the airbag door, and the skin side planned fracture line is smoothly broken when the airbag device is activated. Thus, the airbag door is stably opened.

JP 2006-264633 A (paragraph 0018 column to paragraph 0021 column, FIGS. 1 and 2)

  By the way, in the airbag door of the four-way opening type as described above, the skin side planned break line extends from the skin center planned break line in a direction obliquely outward in the front-rear direction of the vehicle body. Is applied to the front main door part and the rear main door part with a large area, the breaking force in the vehicle width direction of the planned skin center breaking line is not only on the front and rear skin side planned breaking lines but also around it. It also extends. Therefore, when the physical properties of the skin of the airbag door deteriorate due to changes over time, the skin around the planned skin side breaking line may break and scatter.

  The present invention has been made in view of such a point, and the object of the present invention is to ensure that when the airbag door is opened, even if the physical properties of the skin of the four-way opening type airbag door deteriorate due to changes over time, etc. In the skin, it is to surely break only the skin center breaking planned line and the skin side breaking planned line that should originally be broken, and to prevent scattering of the skin around the skin side breaking planned line.

  In order to achieve the above object, the present invention is characterized in that the positions of the front and rear skin side fracture lines are devised.

  Specifically, this invention is formed in a three-layered vehicle instrument panel that is laminated in the order of a base material, a foamed resin layer, and a skin, and is a base material center fracture planned line that extends substantially linearly in the vehicle width direction. And the skin center break planned line, and the front and rear substrate side break planned lines and the skin side break planned line extending in a substantially V shape from the both ends in the vehicle width direction from both ends in the vehicle width direction of the center break planned line, respectively. The main door part, the main door part on the rear side, and the sub door parts on both sides are divided into four sections, and the above-mentioned base material center break planned line, skin center break planned line, base material side break planned line and skin side by the operation of the airbag device A four-way opening type airbag door in which the planned breakage line breaks and the main door part and the sub door parts are opened, and the airbag is deployed from the substantially rectangular airbag discharge opening and inflated into the vehicle interior. Targeted, it was taken to solve the following means.

  That is, according to the present invention, the planned skin center fracture line and the base material central fracture line overlap each other across the foamed resin layer, and the front and rear skin side fracture schedule lines are the front and rear base material side fracture schedules. The angle between the planned front and rear skin side breaks and the angle between the front and rear skin side fracture planned lines is positioned between the lines and shifted from each other in the vehicle longitudinal direction with the foam resin layer interposed therebetween. It is set smaller than the angle formed by the planned break line.

  According to the present invention, the front and rear skin side break planned lines are displaced in the longitudinal direction of the vehicle body from the base material side fracture planned line between the front and rear substrate side fracture planned lines. Compared to the case where the foamed resin layer is overlapped with the planned line, the slant angle of the vehicle body front and rear diagonally with respect to the planned skin center rupture line is loose, and the planned skin center rupture line is broken when the airbag door is opened. Even if the rupture force in the vehicle width direction is smoothly transmitted to the front and rear skin side line, and the physical properties of the airbag door skin deteriorate due to changes over time, the skin center line and skin side line It is possible to ensure that only the line is broken and the skin around the planned skin side fracture line is not broken, and the skin is not scattered.

It is a top view of the airbag door which concerns on embodiment formed in the panel structural member which comprises the left side half of the upper panel in a vehicle instrument panel. It is sectional drawing in the II-II line of FIG. It is sectional drawing in the III-III line of FIG. It is a perspective view of the main door part of the front side at the time of opening operation of the air bag door concerning an embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a panel component 1 constituting the left half of an upper panel in a vehicle instrument panel with a right handle.

  As shown in FIGS. 2 and 3, the panel component 1 has a three-layer structure in which a base material 3, a foamed resin layer 5, and a skin 7 are laminated in this order. They are arranged in parallel. The said base material 3 is injection-molded with resin materials, such as polypropylene (PP) containing a fiber, an acrylonitrile butadiene styrene (ABS) resin, a noryl resin, for example. The foamed resin layer 5 is a urethane foam or the like, and has a semi-rigid structure in which, for example, independent foaming and continuous foaming are distributed about half each. The skin 7 is formed by slush molding or vacuum molding with an elastomer resin material such as thermoplastic urethane (TPU) or a resin material such as polyvinyl chloride (PVC).

  The skin terminal 7a of the skin 7 is formed to be bent at a substantially right angle over the entire circumference on the substrate 3 side. On the other hand, the base material terminal 3a of the base material 3 is formed with a recess 3b that opens on the skin 7 side over the entire circumference, and the surface of the skin terminal 7a is in close contact with the inner surface of the outer vertical wall 3c of the recess 3b from the inside. And seals between the two.

  A rectangular fitting port 9 is formed substantially at the center of the base material 3, and an airbag chute member 11 injection-molded with an elastomer resin material such as a thermoplastic plastic olefin (TPO) is formed on the fitting port 9. It is fitted and installed.

  The airbag chute member 11 has a rectangular cylindrical shape in which an airbag device 15 including an airbag 13 and an inflator (not shown) for protecting a passenger in a passenger seat from an impact from the front-rear direction of the vehicle body is housed. The frame body 17 includes a front frame wall 17a extending in the vehicle width direction, a rear frame wall 17b disposed opposite to the rear side of the front frame wall 17a and extending in the vehicle width direction, A left frame wall (not shown) extending in the vehicle longitudinal direction so as to connect the left edges of the front frame wall 17a and the rear frame wall 17b, and a right frame wall extending in the vehicle longitudinal direction so as to connect the right edges. (Not shown).

  A plurality of hook holes 19 (one each appearing in FIG. 2) are formed in the front frame wall 17a and the rear frame wall 17b at intervals in the vehicle width direction and attached to the airbag device 15. A plurality of hooks 21 (one each appearing in FIG. 2) are inserted into the retaining holes 19, and when the airbag device 15 is operated, the hooks 21 are hooked on the periphery of the retaining holes 19 to be described later. Only the door 31 is pressed upward by the airbag 13. In FIG. 2, reference numeral 23 denotes a bracket for fixing the airbag device 15 to an instrument panel reinforcement (not shown) bridged on the side panel of the vehicle body.

  A state in which the flange portion 25 is integrally formed over the entire outer periphery of the upper end portion of the frame body 17 so as to project outward, and the frame body 17 is fitted into the fitting port 9 from the front side of the base material 3. Thus, the flange portion 25 superposes the back surface on the surface of the base material 3 around the fitting port 9, and the engagement protrusion 27 projecting near the upper end portions of the front frame wall 17a and the rear frame wall 17b is fitted. The airbag chute member 11 is supported by the base material 3 by engaging with the periphery of the joint 9 from below. Although not shown, a seal tape or the like is attached to the overlapping portion between the periphery of the fitting port 9 of the base material 3 and the flange portion 25 of the airbag chute member 11 to seal the gap therebetween.

  A rectangular flap portion 29 for backup is integrally formed on the inner side of the upper end portion of the frame body 17 so as to close the upper end side inside the frame body 17. An open-type rectangular airbag door 31 is formed. That is, the airbag door 31 shares the foamed resin layer 5 and the skin 7 with the panel constituent member 1 around the airbag door 31. The flap portion 29 is a base material for the airbag door 31 and also serves as the base material 3 for the panel component 1.

  A mountain-shaped first groove 29a (see FIG. 2) extending substantially linearly in the vehicle width direction is formed at the center of the back surface of the flap portion 29 so as not to reach the surface. At both ends of the first groove 29a, Front and rear chevron-shaped second grooves 29b (see FIG. 3) extending in a substantially V-shape obliquely outward in the front-rear direction of the vehicle body are formed so as not to reach the surface.

  Further, at the boundary between the flap portion 29 and the frame body 17, the front and rear horizontal hinge portions 29c (see FIGS. 1 to 3) and the vertical hinge portions 29d on both sides (see FIG. 1) are thinned to a predetermined width. The second groove 29b extends to the intersection of the horizontal hinge portion 29c and the vertical hinge portion 29d.

  And the base material center fracture | rupture planned line 29e (refer FIG. 1, 2) which fractures | ruptures by the action | operation of the airbag apparatus 15 is formed so that it may extend in the vehicle width direction substantially linearly by the thin location corresponding to the said 1st groove | channel 29a. In addition, due to the thin portion corresponding to the second groove 29b, the base material side fracture planned line 29f (see FIGS. 1 and 3) before and after breaking by the operation of the airbag device 15 is the base material central fracture planned line. 29e is formed so as to extend from both ends in the vehicle width direction in a substantially V shape in an obliquely outward direction of the vehicle body.

  A mountain-shaped first notch 7b (see FIG. 2) extending substantially linearly in the vehicle width direction is formed at the center of the back surface of the skin 7 corresponding to the flap portion 29 so as not to reach the surface. The first notch 7b And the first groove 29a of the flap portion 29 overlap each other with the foamed resin layer 5 interposed therebetween.

  In addition, front and rear chevron-shaped second cuts 7c (see FIG. 3) extending in a substantially V-shape obliquely outward and forward of the vehicle body are formed at both ends of the first cut 7b so as not to reach the surface. The front and rear second cuts 7c are positioned between the front and rear second grooves 29b of the flap portion 29, and are displaced from each other in the longitudinal direction of the vehicle body with the second groove 29b and the foamed resin layer 5 interposed therebetween. The end extends to the outside of the flange portion 25 of the frame body 17 and reaches the extended line of the front and rear lateral hinge portions 29c.

  And the thin skin part corresponding to the said 1st notch 7b is formed so that the skin center fracture | rupture planned line 7d (refer FIG. 1, 2) fractured | ruptured by the action | operation of the airbag apparatus 15 may extend substantially linearly in a vehicle width direction. The skin center break planned line 7d and the base material center break planned line 29e of the flap portion 29 overlap with each other with the foamed resin layer 5 interposed therebetween.

  Further, due to the thin portion corresponding to the second cut 7c, the skin side planned fracture line 7e before and after breaking by the operation of the airbag device 15 (see FIGS. 1 and 3) is the vehicle width direction of the planned skin center fracture line 7d. The skin side fracture planned line 7e and the base material side fracture planned line 29f are formed in such a manner as to extend obliquely outward from the both ends in the longitudinal direction of the vehicle body. Is misaligned.

  The angle θ1 formed by these front and rear skin side fracture planned lines 7e is set smaller than the angle θ2 formed by the base material side fracture planned lines 29f before and after the flap portion 29. This is the greatest feature of the airbag door 31 according to the embodiment.

  That is, the airbag door 31 includes a front main door portion 31a, a rear center portion planned break line 29e, a skin center break planned line 7d, a substrate side break planned line 29f, and a skin side break planned line 7e. The main door portion 31b on the side and the sub door portions 31c on both sides are divided into four sections.

  The airbag door 31 thus configured has the above-mentioned base material center fracture planned line 29e, the skin center central planned fracture line 7d, the base material side fracture planned line 29f, and the skin side fracture when the airbag device 15 is not in operation. This is a so-called seamless type in which the planned line 7e cannot be identified from the surface side of the panel constituent member 1.

  In the airbag door 31, when the vehicle collides, the airbag 13 of the airbag device 15 is expanded and inflated by the operation of the inflator, and the airbag door 31 is pressed upward by the inflation pressure, so that the base material is broken at the center. The planned line 29e, the skin center fracture planned line 7d, the base material side fracture planned line 29f, and the skin side fracture planned line 7e are broken, and both the main door portions 31a and 31b are directed upward in the longitudinal direction of the vehicle body with the lateral hinge portion 29c as a fulcrum. Both sub-door portions 31c open upward in the vehicle width direction with the vertical hinge portion 29d as a fulcrum, and the airbag 13 is deployed from the substantially rectangular airbag discharge opening 33 and bulges into the vehicle interior. It is supposed to be.

  At this time, the bulging pressure of the airbag 13 acts greatly on the main door portions 31a and 31b having a large area, and the base material central fracture line 29e and the skin central fracture line 7d between them are the foamed resin layer. Since the two layers overlap with each other across 5, they break at the same time, and this breaking force reaches the base material side fracture planned line 29 f and the skin side fracture planned line 7 e, and these base material side fracture planned line 29 f and skin side fracture planned line 7e breaks. In this case, the angle θ1 formed by the front and rear skin side fracture planned lines 7e is set smaller than the angle θ2 formed by the front and rear base material side fracture planned lines 29f, and the front and rear skin side fracture planned lines 7e are the skin 7 Is formed in the area corresponding to both the sub-door portions 31c (on the sub-door portion 31c), so that the center of the skin is broken as compared with the case where the foamed resin layer 5 is sandwiched vertically with the front and rear base material side break planned lines 29f interposed therebetween. The inclination angle of the vehicle body front and rear obliquely outward with respect to the planned line 7d is gentle.

  Accordingly, since the breaking force in the vehicle width direction of the skin center planned breaking line 7d that is broken when the airbag door 31 is opened is smoothly transmitted to the front and rear skin side planned breaking lines 7e, the physical properties of the skin 7 change over time. Even if the skin 7 deteriorates, the skin 7 is surely ruptured only at the skin center rupture line 7d and the skin side rupture line 7e, and the periphery of the skin side rupture line 7e is not broken. As shown by the front main door portion 31a in FIG. 4, the peripheral skin 7 constitutes an extended portion 7f (see FIG. 4) in a state of being integrally attached to both sides of the opened main door portions 31a and 31b. In addition, scattering of the skin 7 can be prevented. The relationship (θ1 <θ2) between the angle θ1 formed by the front and rear skin side planned fracture lines 7e and the angle θ2 formed by the front and rear base material side fracture planned lines 29f indicates that the shearing force of the skin 7 itself is the extension of the skin 7 It is set in a range satisfying a relationship larger than the peeling force with respect to the foamed resin layer 5 of the protruding portion 7f.

  In the above embodiment, the air bag chute member 11 is formed separately from the base material 3 of the panel constituting member 1. However, it may be a single body, and further, a panel material having an air bag door 31 may be a panel. The panel member may be molded by being completely separated from the component member 1 and fitted into the opening formed in the panel component member 1.

  The present invention is useful for a four-way opening type air bag door provided in a vehicle instrument panel.

1 Panel component (instrument panel)
3 Base Material 5 Foamed Resin Layer 7 Skin 7d Skin Central Break Line 7e Skin Side Break Schedule Line 13 Airbag 15 Airbag Device 29e Base Material Center Break Schedule Line 29f Base Material Side Break Schedule Line 31 Airbag Door 31a Front Main Door portion 31b Rear main door portion 31c Side sub-door portion 33 Air bag discharge opening portion θ1 Angle formed by the front and rear skin side fracture lines θ2 Angle formed by the front and rear substrate side fracture lines

Claims (1)

The center of the base material formed in the three-layered vehicle instrument panel (1) laminated in the order of the base material (3), the foamed resin layer (5) and the skin (7) and extending substantially linearly in the vehicle width direction Planned break line (29e) and skin center break planned line (7d), and the base material before and after the center break planned line (29e, 7d) extending from both ends in the vehicle width direction in a substantially V-shape obliquely outward of the vehicle body The front side main door part (31a), the rear side main door part (31b), and the sub-door parts (31c) on both sides are divided into four sections with the side break planned line (29f) and the skin side planned break line (7e). By operating the air bag device (15), the base material center fracture planned line (29e), the skin center center planned fracture line (7d), the base material side fracture planned line (29f) and the skin side fracture planned line (7e) are broken. The main door portions (31a, 31b) and the sub door portions (31c) are opened, and the airbag (13) is deployed from the substantially rectangular airbag discharge opening (31d). A four-way open type of air bag door that bulges in,
The skin center planned fracture line (7d) and the base material central fracture planned line (29e) overlap each other across the foamed resin layer (5),
The front and rear skin side rupture lines (7e) are positioned between the front and back base material side rupture lines (29f) and sandwich the base material side rupture line (29f) and the foamed resin layer (5). And the angle (θ1) formed by the front and rear skin side planned fracture lines (7e) is more than the angle (θ2) formed by the front and rear base material side fracture lines (29f). An airbag door characterized by being set small.

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