JP2018024267A - Airbag lid reinforcing member and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and stably install a net-shaped hinge member while mainly having a margin.SOLUTION: This invention relates to an airbag lid reinforcing member 6 having a hinge part 23 for connecting a door reinforcing part 21 and an external periphery reinforcing part 22 with a margin necessary for an airbag operation. The hinge part 23 is a net-shaped hinge member 33 which is constituted of a lattice-shaped net having a vertical linear part 31 and a lateral linear part 32. In the net-shaped hinge member 33, at least either of the vertical linear part 31 and the lateral linear part 32 is installed and fixed between side edges 21a, 22a in a state of inclining to the side edges 21a, 22a at which the hinge parts 23 of the door reinforcing part 21 and the external periphery reinforcing part 22 are arranged.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an air bag grid reinforcing member and a manufacturing method thereof.

  In vehicles such as automobiles, an instrument panel is installed in the front part of the passenger compartment.

  An air bag device for the passenger seat is installed in a portion on the passenger seat side of the instrument panel as a safety device for protecting the passenger in the passenger seat in an emergency.

  This airbag device stores a bag-like airbag body in a folded state, and covers an airbag module that deploys the airbag body in an emergency, and normally covers the airbag module. And an airbag grid that opens an opening for bulging into the room (see, for example, Patent Document 1).

  The air grid described above includes an air grid member and an air grid reinforcing member. The airbag grid reinforcement member has a door reinforcement part that can reinforce the door part of the airbag grid member and an outer periphery reinforcement part that can reinforce the door outer periphery located on the outer periphery of the door part. The airbag grid reinforcing member has a hinge portion that connects the door reinforcing portion and the outer peripheral reinforcing portion with a margin required when the airbag is operated.

US 8,191,924

However, the airbag grid reinforcing member described in Patent Document 1 has the following problems.
That is, a resin hinge that directly connects the door reinforcing portion and the outer peripheral reinforcing portion together is usually used for the hinge portion described above. As a margin, the resin hinge has a U-shaped “sag”.

  On the other hand, as a hinge part, it replaces with the above-mentioned resin hinge and using the net-like hinge member separate from a door reinforcement part and an outer periphery reinforcement part is examined.

  However, the net-like hinge member is flexible and does not have a fixed shape. For this reason, when manufacturing the airbag grid reinforcing member, it is difficult to install the net-like hinge member with good “sag” as an allowance between the door reinforcing portion and the outer peripheral reinforcing portion.

  Accordingly, the main object of the present invention is to solve the above-described problems.

In order to solve the above problems, the present invention provides:
A door reinforcing portion capable of reinforcing the door portion of the airbag grid member;
An outer periphery reinforcing part capable of reinforcing the door outer peripheral part located on the outer periphery of the door part,
In the airbag grid reinforcing member having a hinge portion that connects the door reinforcing portion and the outer peripheral reinforcing portion with a margin required when the airbag is operated,
The hinge part is a net-like hinge member composed of a grid-like net having a vertical line part and a horizontal line part,
The net-like hinge member has a side edge portion in a state where at least one of the vertical line portion and the horizontal line portion is inclined with respect to each edge portion provided with the hinge portions of the door reinforcing portion and the outer peripheral reinforcing portion. It is characterized by being fixed between.

  According to the present invention, with the above configuration, the net-like hinge member can be easily and stably installed with a margin.

It is a side view of the airbag apparatus provided with the airbag grid reinforcement member concerning this Embodiment. It is a whole perspective view of the airbag grid reinforcement member of FIG. FIG. 3 is a bottom view of the airbag grid reinforcing member of FIG. 2. It is a partial expanded side view of the airbag grid reinforcement member of FIG. It is a longitudinal cross-sectional view which shows the injection molding apparatus for injection-molding an airbag grid reinforcement member. It is the elements on larger scale of FIG. It is a side view which shows the air bag grid reinforcement member taken out from the injection molding apparatus. It is an action | operation figure of the airbag apparatus of FIG. It is the elements on larger scale which show the state of the net-like hinge member before an action | operation. It is the elements on larger scale which show the state of the net-like hinge member after an action | operation. It is a bottom view of the airbag grid reinforcement member similar to FIG. 3 when not arranging the net-like hinge member at an angle. FIG. 13 is a partially enlarged side view of an airbag grid reinforcing member similar to FIG. 4 in the case of FIG. 11.

Hereinafter, the present embodiment will be described in detail with reference to the drawings.
1 to 12 are for explaining this embodiment.

  <Configuration> The configuration of this embodiment will be described below.

  A vehicle such as an automobile is provided with an instrument panel 1 as shown in FIG.

  An air bag device 2 for the passenger seat is installed in a portion on the passenger seat side of the instrument panel 1 as a safety device for protecting the passenger in the emergency seat in an emergency.

  The airbag device 2 stores a bag-shaped airbag body in a folded state, and covers the airbag module 3 that deploys the airbag body in an emergency, and covers the airbag module 3 in an emergency, and is also used in an emergency. And an airbag grid 4 for opening an opening for the main body to bulge into the vehicle interior.

  The airbag grid 4 includes an airbag grid member 5 and an airbag grid reinforcing member 6. The airbag grid 4 includes a door portion 11 and a door outer peripheral portion 12 located on the outer periphery of the door portion 11. The airbag grid reinforcing member 6 includes a door reinforcing portion 21 capable of reinforcing the door portion 11 of the airbag grid member 5 and an outer peripheral reinforcing portion 22 capable of reinforcing the door outer peripheral portion 12 located on the outer periphery of the door portion 11. ing. The airbag grid reinforcing member 6 includes a hinge portion 23 that connects the door reinforcing portion 21 and the outer peripheral reinforcing portion 22 with a margin required when the airbag is operated.

  Here, the instrument panel 1 is made of resin. The lower part of the airbag module 3 is fixed to a steering member 15 installed inside the instrument panel 1 via mounting brackets 16 and 17. The airbag grid member 5 includes one integrated with the instrument panel 1, one separated from the instrument panel 1, and the like.

  The airbag grid member 5 is partitioned by a tear line 13 into a door portion 11 and a door outer peripheral portion 12 located on the outer peripheral side of the door portion 11. The door part 11 forms an opening part inside the door outer peripheral part 12 by being opened by the pressing force of the airbag body when the airbag module 3 is operated. The door portion 11 includes a single-open door and a double-open door. In this embodiment, the door portion 11 is opened in two. The two door portions 11 are arranged side by side in the vehicle longitudinal direction X. The door 11 (and the opening) is substantially rectangular in plan view.

  The outer periphery reinforcing portion 22 of the airbag grid reinforcing member 6 (see also the perspective view of FIG. 2) has a frame shape arranged so as to surround the opening portion along the edge of the door outer peripheral portion 12. The door reinforcing portion 21 is disposed inside the frame-shaped outer peripheral reinforcing portion 22. The door reinforcement portion 21 is provided for each door portion 11. The door reinforcing portion 21 is slightly or slightly smaller than each door portion 11, and a required space is provided between the outer peripheral reinforcing portion 22 and the door reinforcing portion 21 or between the door reinforcing portions 21. A gap s is provided. The hinge part 23 is installed in this gap s. In this case, as shown in FIG. 3, hinge portions 23 are respectively provided between the edge portions 22 a located before and after the outer peripheral reinforcing portion 22 and the corresponding front and rear edge portions 21 a of the door reinforcing portion 21. It has been.

  Further, the outer periphery reinforcing portion 22 is integrally provided with a mounting leg portion 24 (or a guide frame portion) that accommodates the upper portion of the airbag module 3 and guides the deployment of the airbag body. The mounting leg portion 24 extends in the direction in which the airbag body bulges (upwardly obliquely rearward) with respect to the vehicle interior. Locking holes 25 are provided at least on the front and rear surfaces of the mounting leg portion 24, and the airbag module 3 has a hook portion 26 attached to the front and rear surfaces of the airbag module 3. It is designed to be loosely fitted.

  Further, the door reinforcing portion 21 and the outer peripheral reinforcing portion 22 are fixed to the door portion 11 and the door outer peripheral portion 12 by welding or the like, respectively. For that purpose, the door reinforcing portion 21 and the outer peripheral reinforcing portion 22 are provided with welding ribs 27 on the surfaces facing the door portion 11 and the door outer peripheral portion 12. The welding rib 27 is a protrusion that extends in the vehicle width direction Y. The welding rib 27 is melted by heat (for example, frictional heat due to vibration or infrared heat), and is crimped to the door portion 11 or the door outer peripheral portion 12, so that the adhesive strength of the melted welding rib 27 or welding is increased. The rib 27 and the air bag grid member 5 are bonded and fixed by, for example, partly fusing the surface texture.

  In contrast to the basic configuration as described above, this embodiment has the following configuration.

(1) As shown in FIG. 3, the hinge portion 23 is a net-like hinge member 33 formed of a grid-like net having a vertical line portion 31 and a horizontal line portion 32.
The net-like hinge member 33 has at least one of the vertical line portion 31 and the horizontal line portion 32 with respect to the edge portions 21a and 22a where the hinge portions 23 of the door reinforcing portion 21 and the outer peripheral reinforcing portion 22 are provided. In the inclined state, it is installed and fixed between the edge portions 21a and 22a (the gap s).

  Here, the net-like hinge member 33 has shape flexibility in the out-of-plane direction. There are various types of knitting methods for the net constituting the net-shaped hinge member 33. In this case, the net-shaped hinge member 33 has a lattice shape as described above.

  As the net-like hinge member 33, for example, a fiber such as polyester fiber, nylon fiber, or aramid fiber coated with polyurethane, acrylic resin, or the like can be used.

  In this case, a total of two net-like hinge members 33 are installed between the outer peripheral reinforcing portion 22 and the front door reinforcing portion 21 and between the rear door reinforcing portion 21 and the outer peripheral reinforcing portion 22. Is done.

  With the arrangement described above, the lattice-like net-like hinge member 33 that connects the door reinforcing portion 21 and the outer peripheral reinforcing portion 22 has a substantially square shape formed by the vertical line portion 31 and the horizontal line portion 32. The mesh can be extended so as to be crushed into a diamond shape. The crushing direction into the rhombus shape is the expansion / contraction direction of the net-like hinge member 33. In other words, the net-like hinge member 33 is installed between the door reinforcing portion 21 and the outer peripheral reinforcing portion 22 (in the gap s) in an expandable / contractable state. In this case, both the vertical line portion 31 and the horizontal line portion 32 are inclined with respect to the respective edge portions 21 a and 22 a, so that the vehicle longitudinal direction X is the maximum of the net-like hinge member 33. It becomes a stretchable direction.

  As a result, as shown in FIG. 4, the net-like hinge member 33 has an allowance for the amount of expansion and contraction, so that “sag” (for example, a U-shaped folded portion as shown in FIG. ) Can be eliminated.

  (2) As shown in FIG. 3, the net-like hinge member 33 may include a slit-like portion 41 that extends in a direction in which the net-like hinge member 33 can be expanded and contracted.

  Here, the slit-like portion 41 is a slit or a slit-like portion, and may be provided in advance before installing the net-like hinge member 33 between the door reinforcing portion 21 and the outer peripheral reinforcing portion 22. Alternatively, it may be provided after the net-like hinge member 33 is installed. The slit-like portion 41 is provided by, for example, partially cutting or punching the net-like hinge member 33 with respect to the vehicle longitudinal direction X. Further, the slit-like portion 41 may be provided between the side edges by arranging a plurality of belt-like net-like hinge members 33 side by side.

(3) Hereinafter, the manufacturing method of the airbag grid reinforcement member 6 is demonstrated.
The airbag grid reinforcement member 6 includes a door reinforcement portion 21 capable of reinforcing the door portion 11 of the airbag grid member 5;
An outer peripheral reinforcing portion 22 capable of reinforcing the door outer peripheral portion 12 located on the outer periphery of the door portion 11;
Manufacture is performed by connecting the hinge part 23 with a margin required when the airbag is activated.
At this time, a net-like hinge member 33 is disposed between the door reinforcing portion 21 and the outer peripheral reinforcing portion 22, and one of the vertical line portion 31 and the horizontal line portion 32 constituting the net-like hinge member 33. At least one is installed and fixed so as to be inclined with respect to the edge portions 21a and 22a to which the net-like hinge members 33 of the door reinforcing portion 21 and the outer peripheral reinforcing portion 22 are attached.

  Here, FIG. 5 shows an injection molding apparatus 51 for injection molding the air bag grid reinforcing member 6. FIG. 6 is a partially enlarged view of FIG. FIG. 7 is a view showing the air bag grid reinforcing member 6 taken out from the injection molding device 51. In the injection molding apparatus 51, with the lower mold 52 and the upper mold 53 being opened, a net-like hinge member 33 is inserted into a molding space between the lower mold 52 and the upper mold 53, and the lower mold 52 and the upper mold 53 are inserted. And the airbag grid reinforcing member 6 is injection molded by injecting molten resin into the molding space. In addition to the lower mold 52 and the upper mold 53, a slide mold 54 and the like can be used as appropriate for the injection molding apparatus 51.

  At this time, the molding space for molding the door reinforcement portion 21 and the molding space for molding the outer periphery reinforcement portion 22 are provided so as to be in a flush state, and a net-like hinge member is formed with respect to both molding spaces. 33 is inserted in a straight (or flat) state without having "sagging" and without giving elongation.

  <Operation> The operation of this embodiment will be described below.

  When the airbag module 3 is activated in an emergency, the airbag body folded and accommodated inside the airbag module 3 is unfolded and inflated from the airbag module 3, and is guided by the mounting legs 24 to be reinforced by the door. 21 and the door part 11 are pressed. With this pressing force, as shown in FIG. 8, the tear line 13 formed in the air bag grid member 5 is cleaved, and the door portion 11 and the door reinforcing portion 21 are opened around the hinge portion 23, and the door outer peripheral portion 12. An opening is formed in The airbag body bulges into the passenger compartment through an opening formed in the door outer peripheral portion 12, and protects and restrains the upper body of the occupant correctly seated in the seat.

  <Effect> According to this embodiment, the following effects can be obtained.

  (Effect 1) As shown in FIG. 9 (state before opening) and FIG. 10 (state after opening), when the door portion 11 of the airbag grid member 5 is opened, the door portion 11 is moved to the outer peripheral portion of the door by centrifugal force. 12 and because the door portion 11 and the door outer peripheral portion 12 and the door reinforcing portion 21 and the outer peripheral reinforcing portion 22 are thick, the hinge portion 23 of the airbag grid reinforcing member 6 has a margin. A fee is required.

  Therefore, as shown in FIG. 11, the use of a net-like hinge member 33 having variability or shape flexibility, which is separate from the door reinforcing portion 21 and the outer peripheral reinforcing portion 22, has been studied as the hinge portion 23. . The net-like hinge member 33 has an advantage that the thickness is smaller than that of the existing resin hinge 23 (resin hinge 55) indicated by a virtual line in FIG. Accordingly, since the net-like hinge member 33 can reduce the “sag” as a margin, the door reinforcing portion 21 can be attached to the edge portions 21a and 22a of the door portion 11 (by vibration welding or the like). Accordingly, the free portion of the hinge portion 23 can be shortened accordingly. Therefore, since the opening method of the door part 11 and the door reinforcement part 21 can be stabilized, it is structurally advantageous.

  Moreover, when the hinge part 23 is made into the resin hinge 55 integral with the door reinforcement part 21 or the outer periphery reinforcement part 22, the airbag grid reinforcement member 6 must make the whole material in consideration of the function of the hinge part 23. By using the hinge portion 23 as a net-like hinge member 33 that is separate from the door reinforcement portion 21 and the outer periphery reinforcement portion 22, the degree of freedom of the material for the airbag grid reinforcement member 6 can be expanded.

  For example, when the hinge portion 23 is a resin hinge 55, the air bag grid reinforcing member 6 is entirely made of an elastomer having excellent low-temperature brittleness, but the hinge portion 23 is a net-like hinge member 33. The door reinforcing portion 21 and the outer peripheral reinforcing portion 22 can be made of a material other than an elastomer. Further, the door reinforcing portion 21 and the outer peripheral reinforcing portion 22 can be made of different materials.

  On the other hand, since the net-like hinge member 33 is flexible and does not have a fixed shape, when manufacturing the airbag grid reinforcing member 6, the net-like hinge member 33 has a margin between the door reinforcing portion 21 and the outer peripheral reinforcing portion 22. It is difficult to install with a “sag”. In other words, it is difficult to make “sag” with good reproducibility in a state where there is no variation with high accuracy.

  Therefore, it is conceivable to install the net-like hinge member 33 between the door reinforcing portion 21 and the outer peripheral reinforcing portion 22 in a flat state. At this time, in the net-like hinge member 33, the vertical line portion 31 and the horizontal line portion 32 are generally arranged in parallel to the edge portions 21a and 22a of the door reinforcing portion 21 and the outer peripheral reinforcing portion 22. it is conceivable that.

  However, if it does in this way, the overlap for a margin will arise between the door reinforcement parts 21 and between the door reinforcement part 21 and the outer periphery reinforcement part 22. FIG. Therefore, in order to avoid overlap, for example, the door reinforcing portion 21 and the outer peripheral reinforcing portion 22 are offset in the out-of-plane direction by a margin, and between the offset door reinforcing portion 21 and the outer peripheral reinforcing portion 22, The net-like hinge member 33 is molded with a height difference, and the net-like hinge member 33 needs to be provided with a “sag” by installing the net-like hinge member 33 so as to eliminate the height difference after molding.

  However, when the door reinforcing portion 21 and the outer peripheral reinforcing portion 22 are offset in the out-of-plane direction, this time, it takes time and effort to set the net-like hinge member 33 with a height difference, and a stable setting. It becomes difficult to maintain the state. In some cases, it is also necessary to preliminarily shape the net-like hinge member 33 into an offset shape.

  Therefore, in this embodiment, the net-like hinge member 33 is attached to each edge where at least one of the vertical line portion 31 and the horizontal line portion 32 attaches the net-like hinge member 33 of the door reinforcing portion 21 and the outer peripheral reinforcing portion 22. It arrange | positions between the edge parts 21a and 22a so that it may be in the state inclined with respect to the parts 21a and 22a, and it was made to install and fix to the door reinforcement part 21 and the outer periphery reinforcement part 22. FIG.

  The net-like hinge member 33 does not have stretchability in the extending direction of the vertical line portion 31 and the horizontal line portion 32, but has stretchability in the direction inclined with respect to the vertical line portion 31 and the horizontal line portion 32. ing.

  As a result, the net-like hinge member 33 is installed in a stretchable state, that is, the net-like hinge member 33 is connected to the door reinforcing portion 21 and the outer peripheral reinforcing portion 22 in the extending direction. Therefore, it is possible to secure a margin by utilizing the stretchability of the net-like hinge member 33 itself. Therefore, it is not necessary to sag the net-like hinge member 33 to obtain a margin, and at the time of forming the airbag grid reinforcing member 6, the door-reinforcing portion 21 and the outer peripheral reinforcing portion 22 are made to have the same height so Therefore, the net-like hinge member 33 can be obtained easily and stably.

  (Effect 2) In addition to the above, the net-like hinge member 33 may be provided with a slit-like portion 41 extending in a telescopic direction. Thereby, the net-like hinge member 33 can be extended more greatly by the slit-like portion 41. Therefore, the net-like hinge member 33 can secure a sufficiently large margin.

  (Effect 3) According to the manufacturing method of the air bag grid reinforcement member 6 described above, the same effects as described above can be obtained.

  In addition, when the air bag grid reinforcement member 6 is manufactured by insert molding the net-like hinge member 33 with the injection molding device 51, a portion (that is, sandwiched between the lower die 52 and the upper die 53) It is conceivable that the molten resin leaks through the mesh of the net-like hinge member 33 at the portion that becomes the hinge portion 23). However, when the vertical line portion 31 of the net-like hinge member 33 is compressed by clamping, the gap between the lower mold 52 and the upper mold 53 is reduced, and the vertical line portion 31 and the horizontal line portion 32 are dammed. By exhibiting the function, leakage of molten resin can be sealed.

  Further, when the net-like hinge member 33 is used for the hinge portion 23, the anchor effect is obtained by the molten resin constituting the outer peripheral reinforcing portion 22 and the door outer peripheral portion 12 entering the mesh of the net-like hinge member 33. be able to.

  While the embodiments have been described in detail with reference to the drawings, the embodiments are merely illustrative. Therefore, the present invention is not limited only to the embodiments, and it goes without saying that design changes and the like within a range not departing from the gist are included in the present invention. Further, for example, when each embodiment includes a plurality of configurations, it is a matter of course that possible combinations of these configurations are included even if not specifically described. Further, when a plurality of embodiments and modification examples are disclosed, it is needless to say that possible combinations of configurations extending over these are included even if not specifically described. Further, the configuration depicted in the drawings is of course included even if not particularly described. Further, when there is a term of “etc.”, it is used in the sense that the equivalent is included. In addition, when there are terms such as “almost”, “about”, “degree”, etc., they are used in the sense that they include those in the range and accuracy recognized by common sense.

DESCRIPTION OF SYMBOLS 5 Airbag grid member 6 Airbag grid reinforcement member 11 Door part 12 Door outer peripheral part 21 Door reinforcement part 21a Edge part 22 Outer periphery reinforcement part 22a Edge part 23 Hinge part 31 Vertical line part 32 Horizontal line part 33 Net-like hinge member 41 Slit shape portion

Claims (3)

A door reinforcing portion capable of reinforcing the door portion of the airbag grid member;
An outer periphery reinforcing part capable of reinforcing the door outer peripheral part located on the outer periphery of the door part,
In the airbag grid reinforcing member having a hinge portion that connects the door reinforcing portion and the outer peripheral reinforcing portion with a margin required when the airbag is operated,
The hinge part is a net-like hinge member composed of a grid-like net having a vertical line part and a horizontal line part,
The net-like hinge member has a side edge portion in a state where at least one of the vertical line portion and the horizontal line portion is inclined with respect to each edge portion provided with the hinge portions of the door reinforcing portion and the outer peripheral reinforcing portion. An air bag grid reinforcing member characterized by being installed and fixed in between. In the air bag grid reinforcement member according to claim 1,
The net-like hinge member has a slit-like portion that extends in a stretchable direction of the net-like hinge member. A door reinforcing portion capable of reinforcing the door portion of the airbag grid member;
An outer periphery reinforcing part capable of reinforcing the door outer peripheral part located on the outer periphery of the door part;
In the manufacturing method of the airbag grid reinforcement member that has a margin required when operating the airbag and is connected by a hinge part,
A net-like hinge member is disposed between the door reinforcement portion and the outer periphery reinforcement portion, and at least one of a vertical line portion and a horizontal line portion constituting the net-like hinge member is the door reinforcement portion and A manufacturing method of an air bag grid reinforcing member, characterized by being installed and fixed so as to be inclined with respect to a peripheral edge portion to which a net-like hinge member of the outer peripheral reinforcing portion is attached.