JP2019217962A - Air bag grid reinforcement member, mold assembly for manufacturing the same, and manufacturing method - Google Patents

Abstract

To prevent contact with a hinge part mainly when an air bag body is developed.SOLUTION: An air bag lid reinforcement member 31 has an openable/closable door part 32, a flange part 33 surrounding the outer periphery of the door part 32 and a leg part 34 arranged below the door part 32, and has a hinge part 35 connected to the door part 32 so as to open and close the door part provided on the flange part 33. The hinge part 35 has an extra part 52 bypassed downward. The extra part 52 is provided at a position outside of the leg part 34.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an airbag lid reinforcing member, a mold device for manufacturing the same, and a manufacturing method.

  BACKGROUND ART Vehicles such as automobiles are provided with an airbag device as an emergency safety means. For example, an airbag device for a passenger seat includes an airbag module that folds and accommodates a bag-shaped airbag body, a lid member, and an airbag grid reinforcing member (for example, see Patent Document 1).

  The lid member normally covers the airbag module from above and forms an opening for inflating the airbag body deployed from the airbag module into the vehicle compartment in an emergency. The airbag lid reinforcing member is attached to the rear surface side of the lid member to reinforce the lid member, accommodates at least a part of the airbag module, and guides the airbag body deployed from the airbag module to the lid member.

  The lid member has a lid portion opened by the airbag body, and a lid outer peripheral portion surrounding the outer periphery of the lid portion. The airbag lid reinforcing member has a door, a flange, a hinge, and a leg.

  The door portion is attached to the back surface of the lid portion to reinforce the lid portion, and can be opened and closed integrally with the lid portion. The flange portion surrounds the outer periphery of the door portion and is attached to the back surface of the outer periphery of the lid to reinforce the outer periphery of the lid. The hinge portion is arranged at a position inside the leg portion, and connects the door portion to the flange portion so as to be able to open and close. The leg is disposed below the flange and the door while surrounding the upper part of the airbag module.

JP 2006-76509 A

  However, the airbag lid reinforcing member has a problem in that when the airbag body is deployed, when the airbag body comes into contact with the hinge, stress concentrates on the hinge.

  Therefore, an object of the present invention is mainly to solve the above-mentioned problems.

In order to solve the above problems, the present invention provides
An openable and closable door portion, a flange portion surrounding the outer periphery of the door portion, and a leg portion disposed below the door portion,
An airbag lid reinforcing member provided with a hinge portion that opens and closes the door portion to the flange portion,
The hinge portion has a surplus portion detouring downward,
The extra length portion is provided at a position outside the leg portion.

  According to the present invention, with the above configuration, it is possible to prevent the hinge portion from contacting when the airbag body is deployed.

It is a longitudinal section of an airbag device concerning this embodiment (position without a connection rib). FIG. 2 is a vertical cross-sectional view of the airbag device according to the embodiment (a position where a connecting rib is present). FIG. 2 is a plan view of the airbag lid reinforcing member of FIG. 1. It is the perspective view which looked at FIG. 2 from diagonally upper side. It is the perspective view which looked at FIG. 2A from diagonally lower side. FIG. 3 is a cross-sectional view taken along a line AA in FIG. 2 (a position without a connection rib). FIG. 3 is a cross-sectional view taken along a line BB of FIG. 2 (a position where a connection rib exists). It is a top view of the air bag grid reinforcement member similar to FIG. 2 concerning a modification. FIG. 6 is a cross-sectional view taken along a line CC of FIG. 5 (a position where a connection rib exists). It is a longitudinal section of a mold device for manufacture of an airbag lid reinforcing member. FIG. 8 is an enlarged view of a portion similar to FIG. 3 in FIG. 7 (a portion without a connection rib forming portion). FIG. 8 is an enlarged view of a portion (portion having a connecting rib forming portion) similar to FIG. 4 in FIG. 7.

Hereinafter, the present embodiment will be described in detail with reference to the drawings.
1 to 9 are for explaining this embodiment.

  <Structure> The structure of this embodiment will be described below.

  FIG. 1 shows an airbag device. The directions in the figure are a vehicle front-rear direction X, a vehicle width direction Y, and a vertical direction Z.

  A vehicle 1 such as an automobile is provided with an airbag device 3 in a vehicle compartment 2 as an emergency safety means. For example, the airbag device 3 for a passenger seat includes an airbag module 5 that folds and accommodates a bag-shaped airbag body 4, a lid member 6, and an airbag lid reinforcing member 31.

  The lid member 6 normally covers the airbag module 5 from above and forms an opening for inflating the airbag body 4 deployed from the airbag module 5 into the vehicle compartment 2 in an emergency. The lid member 6 has a lid portion 21 opened by the airbag body 4 and a lid outer peripheral portion 22 surrounding the outer periphery of the lid portion 21.

  In this embodiment, two lid portions 21 are provided in the vehicle front-rear direction X. The lid portion 21 and the lid outer peripheral portion 22 are defined by a cleavage line 23. The cleavage line 23 is formed as a cut formed on the rear surface side of the lid member 6 to a depth that does not reach the surface of the lid member 6. The lid member 6 includes a member integrated with the instrument panel 8 and a member separate from the instrument panel 8.

  The airbag lid reinforcing member 31 is attached to the back side of the lid member 6 to reinforce the lid member 6, accommodates at least a part of the airbag module 5, and removes the airbag body 4 deployed from the airbag module 5. Guide to the lid member 6.

  The airbag lid reinforcing member 31 has a door portion 32, a flange portion 33, a leg portion 34, and a hinge portion 35 (see FIGS. 2, 2A, and 2B). Among these, the door part 32 is attached to the back surface of each lid part 21 to reinforce each lid part 21 and can be opened and closed integrally with the lid part 21.

  The flange portion 33 surrounds the outer periphery of the door portion 32 and is attached to the back surface of the lid outer peripheral portion 22 to reinforce the lid outer peripheral portion 22. Welding ribs 36 and 37 for welding to the lid member 6 are provided on the surfaces of the door 32 and the flange 33.

  The leg portion 34 is disposed below the door portion 32 in a state surrounding the upper portion of the airbag module 5. The upper portion of the airbag module 5 is inserted into the leg portion 34 from below, and the leg portion 34 guides the deployed airbag body 4 toward the door portion 32 and the lid portion 21. Functions as a unit. For this purpose, the leg portion 34 is formed in a substantially frame-like shape that surrounds the position outside the door portion 32 and the outer peripheral side of the door portion 32 and extends in the direction of bulging into the vehicle compartment 2 (upward diagonally rearward). .

  Hook portions 42 are provided on the front and rear side surfaces of the upper portion of the airbag module 5, and locking holes 43 in which the hook portions 42 can be loosely fitted are formed in the leg portions 34. The lower portion of the airbag module 5 is fixed to a vehicle body strength member such as a steering support member provided on the vehicle body using a bracket.

  The hinge portion 35 connects the door portion 32 to the flange portion 33 so as to be openable and closable. The hinge portion 35 has a surplus portion 52 that becomes a center of rotation of the door portion 32. The extra length 52 is installed at a position between the door 32 and the flange 33. The hinge portion 35 includes a member integrated with the door portion 32 and the flange portion 33 (integrated hinge), a member formed by a hinge member 54 formed of a separate member (separate hinge), and the like. As the hinge member 54, a flexible resin net or film, a metal plate such as an iron plate, or the like can be used. In this embodiment, a resin net is used for the hinge member 54. The hinge member 54 is embedded in the airbag lid reinforcing member 31 by insert molding.

  In contrast to the above basic configuration, this embodiment is provided with the following configuration.

<About the air back grid reinforcement member 31>
The airbag lid reinforcing member 31 of this embodiment has an openable and closable door portion 32, a flange portion 33 surrounding the outer periphery of the door portion 32, and a leg portion 34 disposed below the door portion 32. And a hinge portion 35 for connecting the door portion 32 to the flange portion 33 so that the door portion 32 can be opened and closed.

  Here, the hinge portion 35 is formed by a separate hinge member 54, but it is structurally possible to form an integral hinge.

(1) The hinge portion 35 has a surplus length portion 52 that detours downward.
The extra length portion 52 is provided at a position outside the leg portion 34 (outer extra length portion).

  Here, the extra length 52 is substantially U-shaped or substantially V-shaped in a side view. The outer side of the leg 34 is an outer side of the leg 34 or an outer side of the outer surface of the leg 34. In the case of the existing airbag lid reinforcing member 31, the extra length portion 52 is provided inside the leg portion 34 that guides the airbag body 4. In this embodiment, by providing the extra length portion 52 outside the leg portion 34, the extra length portion 52 is connected to the airbag body 4 while the leg portion 34 guides the airbag body 4 to the door portion 32. The contact is stopped or hard to contact. With this configuration, the airbag lid reinforcing member 31 has a special shape different from the existing one.

  (2) As shown in FIG. 1 and FIG. 1A, the upper portion of the leg portion 34 may be an inner step portion 162 that extends beyond the lower portion toward the free end side of the door portion 32 (FIG. 3, FIG. 4).

  Here, the free end of the door portion 32 is an end portion of the hinge portion 35 on the opposite side to the extra length portion 52. The inner step portion 162 has a step shape in which the width of the upper portion of the leg portion 34 in the vehicle front-rear direction X direction is smaller than that of the lower portion of the leg portion 34. The width of the lower portion of the leg portion 34 in the vehicle front-rear direction X direction is a wide portion 162 a wider than the airbag module 5. The width of the upper portion of the leg portion 34 in the vehicle front-rear direction X direction is a narrow portion 162b substantially equal to the airbag module 5. The wide portion 162a and the narrow portion 162b are connected by an upwardly narrowing inclined portion 162c.

  Specifically, the wide portion 162a is a portion below the locking hole 43. The inclined portion 162c is started from the position of the locking hole 43 or a position above the locking hole 43.

  The narrow portion 162b is formed to be substantially the same as or shorter than the inclined portion 162c. The upper end of the narrow portion 162b is located inside the end (outer edge) of the door 32 on the hinge 35 side.

  (3) As shown in FIG. 1A, a connecting rib 163 for connecting the leg 34 and the flange 33 may be provided outside the leg 34.

  Here, the upper narrow portion 162b of the leg portion 34 (the front and rear wall portions) that forms the inner step portion 162 when viewed from the side is separated from the inner peripheral edge of the flange portion 33 in the vehicle front-rear direction X. ing. Therefore, the connecting rib 163 is connected to the leg 34 and the flange 33 which are separated from each other, and connects the leg 34 and the flange 33 integrally. Therefore, (the front and rear wall portions) of the leg portion 34 and the flange portion 33 are indirectly connected in the vehicle front-rear direction X via the connection rib 163. The left and right walls of the leg 34 can be directly connected to the flange 33 as shown in FIG. 2B.

  In this case, the connection rib 163 has an inclined outer edge portion connecting a position above the wide portion 162 a of the leg portion 34 and a portion on the outer peripheral side of the flange portion 33.

  The upper edge of the connecting rib 163 extends over the outer edge of the door 32 and the flange 33. The upper edge of the connection rib 163 has a concave excess length support portion that can accommodate the extra length portion 52 of the hinge portion 35 and hold it from below, in the gap between the leg portion 34 and the flange portion 33. 163a are formed.

  In the case of a separate hinge, the lower part of the extra length portion 52 is embedded in the extra length support portion 163a. The upper part of the extra length portion 52 is exposed from the upper edge of the connection rib 163 without being embedded in the connection rib 163.

  In the case of an integral hinge, the extra length portion 52 is placed on the extra length support portion 163a without being entirely embedded in the extra length support portion 163a.

  2A and 2B, a plurality of connection ribs 163 are arranged at intervals in the vehicle width direction Y. The connection rib 163 is provided, for example, at a side portion of the locking hole 43 formed at a lower portion of the leg portion 34 or at a position between adjacent locking holes 43. The number and arrangement of the connection ribs 163 are not limited to the above.

(4) As shown in FIG. 3, the door portion 32 and the leg portion 34 may be directly connected by the connection portion 164.
The connection portion 164 may be a weak portion 164a that is weaker than other portions.

  Here, the upper end portion of the leg portion 34 is located inside the outer edge portion of the door portion 32 by the inner step portion 162, and the leg portion 34 reaches a position on the back surface of the door portion 32 just before contact with the vertical direction Z. Has been extended.

  By providing the connection portion 164 between the rear surface of the door portion 32 and the upper end portion of the leg portion 34, the door portion 32 and the leg portion 34 can be connected at least partially in the vertical direction Z.

  In this embodiment, the connecting portion 164 is provided mainly at a position where there is no connecting rib 163 in the vehicle width direction Y shown in FIG.

  Regarding the position of the connecting rib 163, as shown in FIG. 4, the connecting portion 164 may not be provided (separating portion 165 or a non-connecting portion), or as shown in the modified examples of FIGS. May or may not be provided.

  In the case of FIG. 4, a notch as shown in FIG. 2 is locally provided at the position of the connection rib 163 on the outer edge of the door portion 32. Then, the local cutout portion is defined as a separation portion 165. Therefore, the position of the connecting rib 163 can be set to a state without the connecting portion 164 by the notch.

  Further, in the modification of FIG. 6, as shown in FIG. 5, the above-described local notch is not provided at the position of the connection rib 163 on the outer edge of the door portion 32. This provides a structure in which the connection portion 164 and the separation portion 165 can be easily set.

  The other parts are the door part 32, the flange part 33, and the leg part 34 of the airbag lid reinforcing member 31. These portions are thick enough to withstand deployment of the airbag body 4. The connection portion 164 is formed to be sufficiently thinner than other portions. The fragile portion 164a may be a breakable portion such as a perforation, or may be purposely made of a thin burr formed by leakage of a molten resin from a gap in a mold during injection molding. Note that, even when the separation portion 165 is provided by the cutout portion as shown in FIG. 4, it is possible to form the connection portion 164 with a thickness of about a thin burr between the separation portion 165 and the separation portion 165.

  In order to form the fragile portion 164a, the upper end of the leg portion 34 is preferably tapered over substantially the entire area in the vehicle width direction Y. As a result, the upper end of the tapered leg 34 is directly connected to the back surface of the door 32 at least at a position where there is no connecting rib 163 by the connecting portion 164 having the fragile portion 164a.

<About the mold apparatus 101 for manufacturing the air back grid reinforcing member 31>
The mold apparatus 101 for manufacturing the airbag lid reinforcing member 31 is as shown in FIG. As shown in FIGS. 1 and 1A, the manufacturing mold apparatus 101 is provided under the door 32, which can be opened and closed, a flange 33 surrounding the outer periphery of the door 32, and the door 32. And a forming space 102 for forming the airbag lid reinforcing member 31 provided with a hinge portion 35 for connecting the door portion 32 to the flange portion 33 so that the door portion 32 can be opened and closed. The molding space 102 is formed inside upper and lower molds 103 and 104 and a slide mold 104 a installed on the side of the lower mold 104.
Then, as shown in FIGS. 8 and 9, a surplus portion forming portion 166 that forms the surplus portion 52 that detours downward is provided at a position outside the leg portion 34.

  Here, the extra length forming portion 166 has an extra length forming projection 105 formed on the upper mold 104 and an extra length forming recess 109 provided on the slide mold 104a. . The extra length forming portion 166 forms the extra length portion 52 in the hinge member 54 by partially pushing the hinge member 54 into the extra length forming concave portion 109 by the extra length forming projection 105. It is.

  The manufacturing mold apparatus 101 may include an inner step forming portion 167 for forming the inner step 162 between the lower mold 103 and the slide mold 104a.

  The manufacturing mold apparatus 101 has a connecting rib forming portion 168 for forming the connecting rib 163 on the slide mold 104a.

  The manufacturing die apparatus 101 may include a connection part forming part 169 for forming the connection part 164 on the upper and lower dies 103 and 104 and the slide die 104a (FIG. 8).

  The manufacturing die apparatus 101 may have a separation part forming part 171 for forming the separation part 165 on the upper and lower dies 103 and 104 and the slide die 104a (FIG. 9).

<About the manufacturing method of the airbag lid reinforcing member 31>
The manufacturing method of the airbag lid reinforcing member 31 includes a door portion 32 that can be opened and closed, a flange portion 33 surrounding the outer periphery of the door portion 32, and a leg portion 34 disposed below the door portion 32, This is to manufacture the airbag lid reinforcing member 31 provided with a hinge portion 35 for connecting the door portion 32 to the flange portion 33 so as to be able to open and close.
Then, a surplus length portion 52 that detours downward is formed at a position outside the leg portion 34.

  Here, the air back grid reinforcing member 31 includes a step (setting step) of setting the hinge member 54 inside the opened molds 103 and 104 (and the slide mold 104a), and a step of setting the molds 103 and 104 (and the slide mold). 104a) (mold clamping step), an injection molding step of injecting the molten resin 136 into the molding space 102, and when the molten resin 136 in the molding space 102 has hardened to some extent, the air back grid reinforcing member 31 is molded by a mold. It is manufactured by performing a demolding step of demolding from 103 and 104 (and slide mold 104a).

  At the time of the setting step, the hinge member 54 is set on the lower mold 103 and the slide mold 104a.

  By placing the upper mold 104 on the lower mold 103 and the slide mold 104a in the mold clamping step, the extra-length portion forming projections 105 and the extra-length portion forming recesses 109 of the extra-length portion forming portion 166 are formed. And the extra length portion 52 is formed at a position outside the leg portion 34.

  In the injection molding step, the molten resin 136 is injected into the molding space 102.

  As a result, the airbag lid reinforcing member 31 having the extra length 52 of the hinge 35 at a position outside the leg 34 is formed.

  Further, the inner step portion 167 forms the inner step portion 162. The connection rib 163 is formed by the connection rib forming part 168. The connection portion 164 is formed by the connection portion forming portion 169 at a position where the connection rib 163 is not provided. The separation portion 165 forms the separation portion 165 at the position of the connection rib 163 or the like.

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

  When the airbag body 4 is deployed and exits the airbag module 5 in an emergency, the airbag body 4 is guided along the legs 34 while inflating and pushes the door 32 and the lid 21 from below. The tearing line 23 is torn by the pressing force of the airbag body 4, the door 32 and the lid 21 are opened centering on the hinge 35, and an opening is formed in the lid member 6. The airbag body 4 protrudes from the opening toward the occupant in the passenger compartment 2 to protect and restrain the upper body of the occupant properly seated on the seat.

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

  (Effect 1) The extra length portion 52 of the hinge portion 35 is provided at a position outside the leg portion 34. Thereby, when the airbag main body 4 is deployed, the position where the airbag main body 4 inflates inside the leg portion 34 and moves toward the door portion 32 along the inner surface of the leg portion 34 to push the door portion 32 is securely moved to the hinge portion. 35 can be separated from the extra length 52. Therefore, stress concentration on the hinge portion 35 can be prevented. In addition, stress can be concentrated on the free end side of the door portion 32.

  Further, as described above, since the position where the door portion 32 is pushed first is closer to the center of gravity of the door portion 32 (substantially the center in the vehicle front-rear direction X), the airbag body 4 is opened to act on the door portion 32. The rotational moment in the direction opposite to the direction can be reduced. Then, since the airbag body 4 continues to inflate even after first pushing the door portion 32, the airbag body 4 pushes a position close to the center of gravity of the door portion 32 by inflation, and then moves the free end side of the door portion 32. You can hasten the time before you start pushing. Therefore, the door section 32 can be reliably set to the rotation mode.

  Further, by moving the position of the extra length 52 of the hinge portion 35 from the inside to the outside of the leg portion 34, the airbag body 4 comes into contact with the root of the hinge portion 35 (around the extra length portion 52). Can be avoided.

  The structure in which the extra length portion 52 of the hinge portion 35 is provided outside the leg portion 34 is effective even if it is provided for at least one hinge portion 35. For example, the effect can be obtained only on one side (particularly, the occupant side). be able to.

  (Effect 2) The upper part of the leg 34 may be the inner step 162. Thus, the extra length 52 of the hinge 35 can be easily installed outside the leg 34. Therefore, the extra length portion 52 can be installed outside the leg portion 34 without difficulty.

  (Effect 3) A connecting rib 163 may be provided between the flange 33 and the leg 34. Thereby, the leg 34 and the flange 33 can be firmly connected around the extra length 52 of the hinge 35. Therefore, by installing the extra length portion 52 of the hinge portion 35 outside the leg portion 34, the leg portion 34 and the flange portion 33 are separated in the vehicle front-rear direction X around the extra length portion 52 of the hinge portion 35. Also, the separated leg portion 34 and flange portion 33 can be integrally connected. The connecting rib 163 can protect the extra length 52 of the hinge 35 disposed outside the leg 34.

  (Effect 4) The door portion 32 and the leg portion 34 may be directly connected by the connection portion 164. This allows the connection portion 164 to receive the pressing force received by the door portion 32 from the airbag body 4 before the hinge portion 35 (or the extra length 52 of the hinge member 54) receives. Therefore, stress concentration on the hinge portion 35 can be reduced.

  At this time, the connection part 164 may be the weak part 164a. In this manner, the connection portion 164 that is a weak portion 164a (for example, a thin portion or a perforation) can be used as the first rotation center. Therefore, the center of rotation of the door portion 32 in the early stage of the cleavage becomes clear, and the connection portion 164 can be a trigger for guiding the door portion 32 to the rotation mode.

  Then, the connection portion 164 serving as the weak portion 164a is broken, so that the door portion 32 can continue to rotate about (the base of) the hinge portion 35 that is the second rotation center.

  At this time, the hinge member 54 (the lower part in the thickness direction) of the hinge part 35 is embedded in the upper edge of the connection rib 163 so that the hinge member 54 is connected when the door part 32 and the lid part 21 are opened. Since the rib 163 is rotated while being peeled off from the upper edge, the force applied to the hinge member 54 can be dispersed using the peeling.

  (Effect 5) According to the mold apparatus for manufacturing the air backgrid reinforcing member, the same operation and effect as described above can be obtained.

  (Effect 6) According to the method of manufacturing the air backgrid reinforcing member 31, the same operation and effect as described above can be obtained.

31 Air Back Grid Reinforcement Member 32 Door 33 Flange 34 Leg 35 Hinge 52 Extra Length 101 Manufacturing Mold Device 102 Molding Space 103 Mold 104 Mold 104a Slide Mold 162 Inner Step 163 Connection Rib 164 Connection 164a Fragile part 166 Extra length forming part X Vehicle longitudinal direction Y Vehicle width direction Z Vertical direction

Claims (6)

An openable and closable door portion, a flange portion surrounding the outer periphery of the door portion, and a leg portion disposed below the door portion,
An airbag lid reinforcing member provided with a hinge portion that connects the door portion to the flange portion so that the door portion can be opened and closed,
The hinge portion has a surplus portion detouring downward,
The airbag lid reinforcing member, wherein the extra length portion is provided at a position outside the leg portion. The airbag lid reinforcing member according to claim 1,
An airbag lid reinforcing member, wherein the upper portion of the leg portion is an inner step portion projecting toward the free end side of the door portion from the lower portion. The airbag lid reinforcing member according to claim 1 or 2,
An airbag lid reinforcing member, wherein a connecting rib for connecting the leg and the flange is provided outside the leg. The airbag lid reinforcing member according to any one of claims 1 to 3,
The door portion and the leg portion are directly connected by a connection portion,
The connection portion is a brittle portion that is more brittle than other portions. An openable and closable door portion, a flange portion surrounding the outer periphery of the door portion, and a leg portion disposed below the door portion,
In a manufacturing mold apparatus provided with a molding space for molding an airbag lid reinforcing member provided with a hinge portion that opens and closes the door portion to be able to open and close the flange portion,
A mold device for manufacturing an airbag lid reinforcing member, further comprising an extra length forming portion that forms an extra length portion detouring downward at a position outside the leg portion. An openable and closable door portion, a flange portion surrounding the outer periphery of the door portion, and a leg portion disposed below the door portion,
A method of manufacturing an airbag lid reinforcing member for manufacturing an airbag lid reinforcing member provided with a hinge portion that connects the door portion to the flange portion so as to be able to open and close,
A method of manufacturing an airbag lid reinforcing member, comprising: forming a surplus portion detouring downward at a position outside the leg portion.