JP4293872B2 - Interior parts for vehicles with airbag doors - Google Patents

Description

  The present invention relates to a vehicle interior 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.

As an instrument panel that is an interior product for a vehicle with an airbag door part, a frame body that houses an airbag device is welded to the back of the instrument panel main body so as to correspond to a substantially rectangular shooting port inside the frame body. An airbag door portion is formed on the instrument panel body, and a reinforcing flap, which is different from the frame body, is disposed inside the frame body and joined to the frame body, and is welded to the back surface of the airbag door portion. An instrument panel is known (see, for example, Patent Document 1).
DE 199 40 984 A1 (column 4, FIG. 2)

By the way, the flap is composed of a flap main body portion and a hinge portion, and the airbag door portion is formed by the operation of the air bag device causing the substantially rectangular breakable portion corresponding to the shooting port to break when the vehicle collides. Together with the part, the hinge part is rotated and opened as an opening operation fulcrum . Therefore, in order to carry out a smooth opening operation of the air bag door portion, generally it is set to substantially correspond to the positional relation to the hinge portion made of the breakable portion of the hinge portion side and the opening operation fulcrum. In this case, if the hinge part is far away from the inner wall of the frame to the inner side of the shooting port, the fracture part on the hinge part side corresponding to this is also the wall of the frame body, that is, the welded part of the frame and the instrument panel body Will be far away from. Under such circumstances, when the inflation pressure of the airbag acts on the airbag door portion, the instrument panel main body between the welded portion and the planned fracture portion around the airbag door portion on the hinge side is An instrument on the hinge-corresponding side around which the expected rupture part does not break in the normal state without breaking the bulge pressure of the airbag due to large deflection, and the bulge pressure of the airbag is absorbed by this deflection. There is a risk of the panel body scattering.

  The present invention has been made in view of the above points, and an object of the present invention is to break the planned fracture portion in a normal state.

  In order to achieve the above object, the present invention is characterized in that the coupling structure between the hinge portion of the flap and the frame is devised.

Specifically, the present invention includes a substantially rectangular cylindrical frame portion that has a substantially rectangular shooting port and accommodates an airbag device therein, and is molded integrally with the frame portion and the rear surface of the interior body. And a resin-made frame body comprising a flange portion extending outward from the frame portion from the shooting port side of the frame portion, and the shooting port of the frame portion is welded to the back surface of the interior article body and the above A flap body part that covers the shooting port and a base part that is molded integrally with the flap body part and that intersects the frame part and the flange part so that there is a gap between the back surface of the interior part body. plastic flap reinforcing consisting of a curved hinge portion in a concave shape is disposed, the said interior part body, so as to correspond to the shooting opening, and in the hinge portion side shooter With breakable portion of substantially rectangular shape so as substantially corresponding to the hinge portion serving as opening operation fulcrum inner side is formed, the air bag door portion by a region surrounded by the breakable portion is formed, during the vehicle collision The interior of the vehicle with an airbag door portion configured to break the planned breakage portion by the operation of the airbag device, and the airbag door portion pivots and opens with the hinge portion as an opening fulcrum together with the flap body portion. The following solutions were taken for products.

  That is, according to the present invention, a step portion is formed at the intersection of the frame portion and the flange portion so that the base portion of the hinge portion is coupled so that the shooting port is widened, and the base portion of the hinge portion is formed. Is integrally molded and joined to the stepped portion, and is welded to the back surface of the interior article main body.

According to this invention, since the base portion of the hinge portion is coupled to the step portion on the frame body side, the hinge portion approaches the frame portion by the width of the step portion, and the fracture portion on the hinge portion side that substantially corresponds to this is also the frame. The part, that is, the welded portion between the frame and the interior product main body is approached. Therefore, even if the inflation pressure of the airbag acts on the airbag door portion, the interior product body between the welded portion and the planned fracture portion around the airbag door portion does not bend greatly, Since the bulging pressure acts concentrating on the part to be ruptured and the part to be ruptured is ruptured in a normal state, it is possible to prevent scattering of the interior part main body corresponding to the hinge part around it.

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

(Embodiment 1)
FIG. 4 shows a front part of the passenger seat of the instrument panel 1 as an interior part for a vehicle with an air bag door according to Embodiment 1 of the present invention. 2 is a cross-sectional view taken along line II-II in FIG. The instrument panel 1 is a two-layered interior product composed of a resin base material 3 formed of polypropylene (PP) resin or the like and a resin skin 5 integrally coated on the surface side of the base material 3. An instrument panel main body 7 as a main body is provided.

  On the back surface of the base material 3 of the instrument panel body 7, two opposing sides extend parallel to the vehicle width direction, and the other two opposing sides extend parallel to the vehicle body front-rear direction so as to surround a substantially rectangular shape in plan view. A groove portion 9 is formed, and a portion of the instrument panel main body 7 corresponding to the groove portion 9 is formed to be thin, so that a planned fracture portion 11 having a substantially rectangular shape in plan view is formed. And by the area | region enclosed by this fracture | rupture planned part 11, the airbag door part 13 which fractures | ruptures and opens the said fracture | rupture planned part 11 by the action | operation of the airbag apparatus 33 mentioned later at the time of a vehicle collision respond | corresponds to the shooting port 19 mentioned later. Formed. The airbag door portion 13 is configured as a so-called seamless type in which the planned break portion 11 cannot be identified from the surface side of the instrument panel body 7.

  A resin frame 15 is fixed by vibration welding to the back surface of the airbag door portion 13 and the surrounding instrument panel body 7. The frame body 15 includes a frame portion 17 formed in a substantially rectangular cylindrical shape. The frame portion 17 is disposed so as to face the front frame wall 17a extending in the vehicle width direction and the rear side of the front frame wall 17a. A rear frame wall 17b extending in the 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 the right edges It consists of a right frame wall 17c extending in the longitudinal direction of the vehicle body so as to be connected. Further, as shown in FIG. 3, a substantially rectangular shooting port 19 for inflating the airbag is formed inside the opening end that is the upper end of the frame portion 17, and the shooting portion 19 is formed outside the upper end of the frame portion 17. A flange portion 21 extending outward from the frame portion 17 from the mouth 19 side is integrally formed.

A reinforcing resin flap 23 is disposed in the shooting port 19 of the frame portion 17. Since the flap 23 is opened together with the airbag door portion 13 by the operation of the airbag device 33, the flap 23 is formed of a high-toughness resin material that is not easily damaged in a low temperature state. On the other hand, the frame body 15 is formed of a resin material containing glass fiber having relatively high rigidity in order to accommodate the airbag device 33. The flap 23 is formed integrally with the flap main body portion 25 and the flap main body portion 25, and has a concave shape so as to have a gap between the back surface of the instrument panel main body 7. In the first embodiment, the flap 23 is substantially S-shaped. It consists curved hinge portion 27. the hinge portion 27 is disposed on the vehicle front side of one side of the shooting port 19, the base portion 27a is coupled to the intersection 29 between the frame portion 17 and the flange portion 21, the breakable The part 11 is formed so as to substantially correspond to the hinge part 27 serving as an opening fulcrum on the inner side of the shooting port 19 on the hinge part 27 side . The flap main body 25 covers the shooting port 19 with a slight U-shaped gap between the periphery and the frame portion 17. On the surfaces of the flange portion 21 and the flap main body portion 25, vibration welding projections 31 are integrally projected vertically and horizontally, and the projection 31 is also integrally formed on the base portion 27a of the hinge portion 27. The flange portion 21, the flap body portion 25, and the base portion 27 a of the hinge portion 27 are fixed to the back surface of the instrument panel body 7 through vibration welding, and the frame body 15 is disposed on the back side of the instrument panel body 7.

  An air bag device 33 including an air bag and an inflator for protecting the passenger in the front passenger seat from an impact in the longitudinal direction of the vehicle body is housed in the frame portion 17, and the air bag device 33 includes a plurality of hooks. 35 are fixed at intervals in the vehicle width direction, and these hooks 35 are inserted into a plurality of engaging holes 17d formed at intervals in the vehicle width direction in the frame portion 17 so that each hook 35 is engaged when the airbag device is activated. The frame body 15 is prevented from jumping out by being caught on the periphery of each engagement hole 17d.

  A screw member 37 projects downward from the lower end of the airbag device 33, and the screw member 37 is inserted into a through hole 39 a formed on one end side of a metal bracket 39, and a nut 41 is attached to the screw member 37. The bracket 39 is fastened to the lower end of the airbag device 33 by screwing. The other end of the bracket 39 is fixed by welding to a metal instrument panel reinforcement 43 that extends in the vehicle width direction and supports the instrument panel body 7. Thus, the lower end of the airbag device 33 is connected and supported to the instrument panel reinforcement 43 via the bracket 39.

  A cross-section such that the shooting port 19 expands at a portion where the base portion 27a of the hinge portion 27 is coupled at the intersection 29 of the frame portion 17 and the flange portion 21 as shown in detail in FIG. A substantially L-shaped stepped portion 45 is formed, whereby a bulging wall 49 having a substantially L-shaped cross section is formed outside the intersecting portion 29. The step 45 includes a vertical wall 45 a and a horizontal wall 45 b, and an anchor portion 51 having a substantially T-shaped cross section is integrally formed on the vertical wall 45 a along the longitudinal direction of the hinge portion 27. The base portion 27a of the hinge portion 27 is molded and joined integrally with the step portion 45 and is vibration-welded to the back surface of the instrument panel body 7 and fixed. This is a feature of the first embodiment. The procedure for integrally molding the base portion 27a of the hinge portion 27 to the step portion 45 is to first mold the frame body 15 having the frame portion 17 and the flange portion 21 in advance, and then mold the frame body 15 with a mold. This is performed by so-called double injection molding (two-color molding) in which the flap 23 is integrally molded with the frame portion 17. At this time, the base portion 27 a of the hinge portion 27 is integrally molded and coupled to the step portion 45. The frame 15 and the flap 23 integrated in this way are arranged on the back surface of the instrument panel main body 7 and are sandwiched by jigs 53 from the front and back sides as shown by phantom lines in FIG. 7 Vibration welded to the back. At this time, since the bulging wall 49 of the frame 15 is received by the jig 53, the jig 53 is positioned near the projection 31 for vibration welding of the hinge portion 27 and the base portion 27 a of the hinge portion 27 is instrumented. Vibration welding can be reliably performed on the back surface of the panel body 7.

  In the instrument panel 1 configured as described above, when the vehicle collides, the airbag of the airbag device 33 is inflated by the operation of the inflator, and the airbag door portion 13 and the flap body portion 25 are moved upward by the inflation pressure. As a result of the pressing, the planned fracture portion 11 breaks and the hinge portion 27 extends in a straight line. As a result, the airbag door portion 13 protrudes upward integrally with the flap body portion 25 as shown in FIG. Although not shown in the drawing, the hinge portion 27 in the linear state is rotated about the opening operation fulcrum to open upward in the front direction of the vehicle body. At this time, since the base portion 27a of the hinge portion 27 is integrally coupled to the step portion 45 on the frame body 15 side, the hinge portion 27 is connected to the front frame wall 17a of the frame portion 17 by the width of the horizontal wall 45b of the step portion 45. And the expected fracture portion 11 on the hinge portion 27 side that substantially corresponds to the front frame wall 17 a of the frame portion 17, that is, a welding location (projection 31) between the frame body 15 and the instrument panel body 7. The distance W between the vibration welding projection 31 of the hinge portion 27 and the planned fracture portion 11 can be set narrow. Therefore, even if the inflation pressure of the airbag acts on the airbag door portion 13, the instrument panel body 7 between the weld location (protrusion 31) around the airbag door portion 13 and the planned fracture portion 11. Is not greatly bent, and the bulging pressure of the airbag can be concentrated and acted on the planned breaking portion 11 to break the planned breaking portion 11 in a normal state. Scattering of the instrument panel body 7 can be prevented.

(Embodiment 2)
FIG. 5 shows an instrument panel 1 according to the second embodiment. The instrument panel 1 is the same as that of the first embodiment except that the structure of the frame portion 17 of the frame 15 is different. That is, the frame portion 17 of the second embodiment includes a resin upper frame portion 55 that bulges downward integrally from the back surface of the flange portion 21 on the shooting port 19 side, and a metal lower frame portion 57. By assembling the lower frame portion 57 to the flange portion 21, the upper frame portion 55 and the lower frame portion 57 are continuously arranged in the vertical direction to form the frame portion 17.

  In order to describe the assembly structure, a plurality of bolt insertion holes 21a are formed through the flange portion 21 along the periphery of the shooting port 19, while an overhang portion 57e is formed at the upper edge of the lower frame portion 57. Are integrally formed, and a plurality of bolt insertion holes 57f are also formed in the overhanging portion 57e so as to penetrate the bolt insertion holes 21a. Then, the bolt 59 is moved from the flange portion 21 side to the bolt insertion holes 21a and 57f in a state where the projecting portions 57e of the lower frame portion 57 are overlapped with the flange portion 21 so that the respective bolt insertion holes 21a and 57f are aligned. The lower frame portion 57 and the flange portion 21 are coupled by inserting and fastening the nut 61 to the shaft portion of the bolt 59 protruding toward the projecting portion 57e.

  The step portion 45 is formed on the upper side of the upper frame portion 55, and the base portion 27 a of the hinge portion 27 is integrally molded and coupled to the step portion 45 and is projected on the back surface of the instrument panel body 7. It is welded by 31.

  5, 57a is a front frame wall of the lower frame portion 57, 57b is a rear frame wall of the lower frame portion 57, 57c is a right frame wall of the lower frame portion 57, and 57d is a hooking hole for hooking the hook 35. There are respectively corresponding to reference numerals 17a to 17d in FIG. In addition, the same code | symbol is attached | subjected to the location comprised similarly to Embodiment 1, and the detailed description is abbreviate | omitted.

  Therefore, the second embodiment can achieve the same effects as the first embodiment.

  In each of the above-described embodiments, the hinge portion 27 is illustrated as having a shape curved in a substantially S shape. However, a shape curved in a substantially U shape may be used.

  Further, in each of the embodiments described above, a slight gap is formed between the front end of the flap main body 25 and the frame portion 17, but the front end of the flap main body 25 extends to the side of the shooting port 19 of the frame 17. It may be superposed and contact-supported.

  Moreover, in each said embodiment, although the flange part 21 and the flap 23 were vibration-welded, as another means of vibration welding, other welding means, such as ultrasonic welding and heat caulking welding, may be sufficient.

  Further, in each of the above-described embodiments, the hinge door 27 is provided at one location on the vehicle body front side extending in the vehicle width direction of the shooting port 19 so that the airbag door portion 13 opens upward in the vehicle body direction. Hinge portions may be provided at two locations in the vehicle body longitudinal direction extending in the vehicle width direction so that the front door portion and the rear door portion are double-opened. Further, an opening is formed in the instrument panel main body 7, and a panel material as another member constituting a part of the instrument panel main body 7 is fitted into the opening, and the flap in each of the above embodiments is mounted on the back surface of the panel material. The frame body 15 provided with 23 may be fixed.

  Furthermore, in each of the embodiments described above, the instrument panel body 7 has a form in which the skin 5 is coated on the surface side of the base material 3, but only the base material 3 may be omitted without the skin 5.

  In addition, in each of the above-described embodiments, the case where the interior product is the instrument panel 1 with an airbag door portion is shown, but a steering handle with an airbag door portion may be used.

  The present invention can be applied to an interior product that needs to protect an occupant when a vehicle collides, such as a vehicle instrument panel or a steering handle.

It is the A section enlarged view of FIG. It is sectional drawing in the II-II line of FIG. 3 is a plan view of a frame body in Embodiment 1. FIG. FIG. 3 is a perspective view of a front part of the passenger seat of the instrument panel according to the first embodiment. FIG. 3 is a diagram corresponding to FIG. 2 of the second embodiment.

Explanation of symbols

1 Instrument panel (vehicle interior)
7 Instrument panel body (interior product body)
DESCRIPTION OF SYMBOLS 11 Fracture part 13 Airbag door part 15 Frame 17 Frame part 19 Shooting port 21 Flange part 23 Flap 25 Flap main-body part 27 Hinge part 27a Base part 27b Recessed part 29 Intersection part 33 Airbag apparatus 45 Step part

Claims (1)

A substantially rectangular tubular frame having a substantially rectangular shooting port for accommodating the airbag device therein, and a shooting port for the frame formed integrally with the frame and welded to the back surface of the interior body A resin frame comprising a flange portion extending outward from the side of the frame portion;
The shooting port of the frame part is welded to the back surface of the interior product main body and covers the shooting port, and is formed integrally with the flap body part and intersects the frame part and the flange part. A base part is coupled to the part, and a reinforcing resin flap made of a hinge part that is concavely curved so as to have a gap between the back surface of the interior product main body is disposed,
The interior main body is formed with a substantially rectangular portion to be ruptured so as to correspond to the shooting port and on the hinge portion side so as to substantially correspond to the hinge portion serving as an opening fulcrum on the inner side of the shooting port. In addition , an airbag door portion is formed by the region surrounded by the planned breaking portion,
With the airbag door portion configured to break the planned breakage portion by the operation of the airbag device at the time of a vehicle collision, and the airbag door portion rotates and opens with the hinge portion as an opening fulcrum together with the flap body portion. Vehicle interior parts,
A stepped portion is formed at the intersection of the frame portion and the flange portion where the base portion of the hinge portion is coupled so that the shooting port is widened,
An interior part for a vehicle with an airbag door part, wherein the base part of the hinge part is molded and joined integrally with the step part and welded to the back surface of the interior part main body.

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