JP5116252B2 - Cover body of airbag device - Google Patents

Description

  The present invention relates to a cover body of an airbag device for a passenger in a passenger seat of an automobile, for example.

  2. Description of the Related Art Conventionally, an airbag device for a passenger in a passenger seat disposed on an instrument panel of an automobile is known. The airbag device includes a box-shaped case body, and a folded airbag and an inflator for injecting a gas for inflating the airbag are housed inside the case body. The upper opening is covered with a cover body. And this cover body is provided with the plate-shaped surface plate part attached along an instrument panel, and the leg piece part projected on the back surface side of this surface plate part. A tearable tear line such as a substantially plane H shape or a plane C shape is formed on the front plate portion, and a portion surrounded by the tear line is partitioned and formed as a planned door portion. The part which is not formed is a hinge part which can be bent. In addition, the leg piece portion is integrally projected from the back side of the front plate portion along the outer peripheral side of the planned door portion of the cover body, that is, along the outer peripheral side of the tear line and the hinge portion, and is attached to the case body or the like. It has been.

  In the event of a car collision, the air bag is inflated by injecting gas from the inflator, the tear line is broken to form the door part, and the door part is developed with the hinge part as a fulcrum to form a protruding port. The airbag is inflated in front of the occupant from the projecting opening so as to reduce the impact applied to the occupant.

Regarding such a cover body, a configuration is known in which the entire cover body, that is, the front plate portion and the leg piece portion are integrally formed of resin (see, for example, Patent Document 1). In the configuration of this Patent Document 1, a tear line having a substantially H-shaped plane is provided on the back surface of the front plate portion, and a thin wall portion is formed in which the back surface of the front plate portion is recessed in front of and behind the tear line. The recessed thin wall portion is used as a hinge portion that bends when the airbag is deployed. Further, in this configuration, the thickness of the front and rear hinge portions is made different to adjust the deployment direction of the airbag.
JP-A-9-188211 (FIG. 1-2)

  In the configuration in which the leg piece portion is integrally projected on the back side of the front plate portion as in the conventional case, the amount of resin in the leg piece portion increases, and the surface side is uneven as the resin shrinks during curing. This causes a so-called sink, which causes the appearance to deteriorate. Here, sinking can be suppressed by making the hinge part recessed greatly, that is, by reducing the thickness dimension of the hinge part. However, if the thickness dimension of the hinge part is reduced, it is easy to ensure strength. Have no problems.

  This invention is made | formed in view of such a point, and it aims at providing the cover body of the airbag apparatus which can suppress a sink and can improve an external appearance.

The cover body of the airbag device according to claim 1 covers the front side of the stored airbag and deploys when the airbag is inflated, a non-deployed portion adjacent to the scheduled door, and these A front plate portion provided with a deformable hinge portion for connecting the non-deployed portion and the planned door portion, and projecting integrally from a position along the hinge portion on the back side of the non-deployed portion of the front plate portion A leg piece portion to be formed; and a plate-like reinforcing rib that integrally connects the front plate portion and the leg piece portion, wherein the leg piece portion is in contact with the front plate portion. A first thin portion having a thickness smaller than an adjacent portion of the leg piece portion is provided along the side of the planned door portion which is a side, and the hinge portion is curved and continuous to the first thin portion. And the back surface side of the front plate portion is recessed, and the thickness is smaller than the adjacent portion of the front plate portion. It includes a thin portion, the reinforcing rib is integrally projected from said door portion to be the second forming portion of the thin portion of said first thin wall part is provided with portions of the leg portions and the table plate portions It is a triangular plate connecting these parts .

And in this structure, since the 1st thin part with a small thickness dimension was provided along the position which touches the surface board part of a leg piece part, it is in a leg piece part with shrinkage at the time of hardening of the material which constitutes a cover body. The occurrence of so-called sink marks in which irregularities are generated on the surface side of the surface plate portion of the adjacent portion is suppressed, and the appearance is improved. Since the leg piece portion provided at the position along the hinge portion is provided with the first thin portion having a small thickness dimension, smooth bending of the hinge portion is promoted, and the planned door portion is smoothly developed. Furthermore, since the triangular reinforcing ribs connected to the front plate portion and the leg piece portions are provided, it is easy to control the unfolding behavior, and it is possible to secure the rigidity when the surface side of the front plate portion of the cover body is pushed. . Further , the hinge portion has a curved surface and is continuous with the first thin portion, and is provided with a second thin portion having a recessed surface on the back side of the front plate portion and having a thickness dimension smaller than an adjacent portion of the front plate portion. The reinforcing rib is formed by connecting the portions where the first thin portion and the second thin portion are formed, and the second thin portion of the leg piece portion forms a curved surface shape with the first thin portion of the hinge portion. Since it is continuous, the hinge portion bends smoothly and the planned door portion develops smoothly.

Cover of an airbag device according to claim 2, wherein, in the cover of the airbag apparatus according to claim 1 Symbol placement, on the back side of the front plate portion, positioned on the opposite side of the hinge portion relative to the leg portion, And it is provided with the 3rd thin part whose thickness dimension is smaller than the adjacent part of a surface board part along the position which contact | connects a leg piece part.

  And in this structure, since the 3rd thin part with a small thickness dimension was provided in the other side of the hinge part with respect to the leg piece part, it adjoins to the leg piece part with the shrinkage | contraction at the time of hardening of the material which comprises a cover body. Occurrence of so-called sink marks in which irregularities are generated on the surface side of the front plate portion of the portion is suppressed, and the appearance is improved.

According to the cover body of the airbag device of the present invention, since the first thin portion having a small thickness dimension is provided along the position in contact with the front plate portion of the leg piece portion, the material constituting the cover body is cured. Occurrence of so-called sink marks in which unevenness is generated on the surface side of the front plate portion in the vicinity of the leg piece portion due to the shrinkage is suppressed, and the appearance is improved. Since the leg piece portion provided at the position along the hinge portion is provided with the first thin portion having a small thickness dimension, smooth bending of the hinge portion is promoted, and the planned door portion is smoothly developed. Furthermore, since the triangular reinforcing ribs connected to the front plate portion and the leg piece portions are provided, it is easy to control the unfolding behavior, and it is possible to secure the rigidity when the surface side of the front plate portion of the cover body is pushed. .

  Hereinafter, an embodiment of a cover body of an airbag device of the present invention will be described with reference to the drawings.

  In FIG. 1, reference numeral 1 denotes an airbag device. The airbag device 1 is provided in an instrument panel 3 in a vehicle interior of a car as a vehicle, and protects an occupant who is a protection target seated in a passenger seat. An airbag device 1 for a passenger on the passenger seat is configured. In other words, the instrument panel 3 is located in front of the passenger seat, and is disposed in the front part of the passenger compartment with the two sides being the vehicle width direction as the longitudinal direction. A front window glass is located above the instrument panel 3.

  The airbag device 1 includes a cover body 11 provided in a square opening provided in the instrument panel 3 and an airbag module disposed on the back side of the cover body 11. The bag module includes a case body 14, an airbag 16 attached to the case body 14, a retainer, an inflator, a bracket, and the like. In addition, the airbag device includes a control unit and a sensor that are connected to the inflator via a harness.

  The airbag device 1 is normally attached to the curved instrument panel 3 while being inclined in an appropriate direction from the upper side to the rear side. The front direction is F, the vehicle width direction is the both-side direction, and the center direction of the deployment of the airbag 16 is the upper direction A.

  The case body 14 is an attached member to which the cover body 11 is attached, and is formed in a substantially box shape having an upper side opened by pressing a metal plate or the like. A plurality of hooks 14a are fixed to the front and rear surfaces of the case body 14, respectively. The airbag 16 is formed into a bag shape by stitching the base fabric, etc., and is stored in the upper portion of the case body 14 in a folded state, and the opening is directed downward. The peripheral portion is fixed to the case body 14 using a retainer. The inflator has a disk shape or a columnar shape, and is fixed to the bottom of the case body 14. And this inflator supplies gas by burning the chemical | medical agent incorporated or releasing the gas stored by compression. The case body 14 is fixed to a member constituting the vehicle body via a bracket.

  Further, the cover body 11 is also called a lid (LID), and a resin material is introduced into a mold, that is, formed integrally with a resin. As shown in FIG. 1 to FIG. A front plate portion 21 that is disposed flush with the outside and is exposed to the outside, and a leg piece portion 22 that protrudes from the back side of the front plate portion 21 are provided. Then, the front plate portion 21 includes a pair of planned door portions 27 and the planned door portions 27 by a tear line 24 that is a planned fracture portion that is easily broken from other portions and a hinge portion 25 that is easily bent from the other portions. And a frame portion 28 surrounding the frame. The frame portion 28 and the leg piece portion 22 constitute a non-deployed portion 29.

  The tear line 24 is formed by cutting the back side of the front plate portion 21 into a concave groove shape, and the like. The first tear line 24a extends in both directions, and the second tear line extends from both ends of the first tear line 24a. It is formed in a substantially plane H shape including a tear line 24b and a regulation tear line 24c provided in a substantially U shape so as to fold back the front and rear ends of the second tear line 24b. Further, as will be described later, the hinge portion 25 is formed so that the back surface side of the front plate portion 21 is recessed and the both side directions are formed in the longitudinal direction between the regulation tear lines 24c opposed to both sides. In this way, a pair of front and rear door planned portions 27 having a substantially rectangular plane shape and a square frame-shaped frame portion 28 surrounding these door planned portions 27 are formed.

  Further, the leg piece portion 22 can be called an attachment piece portion or a vertical wall. The leg piece portion 22 is formed along the inner peripheral portion of the frame portion 28, that is, along the outer peripheral side of the second tear line 24b and the hinge portion 25. While projecting from the rear surface side of the frame portion 28 of the plate portion 21 in a substantially rectangular tube shape, a plurality of mounting holes 31 that are rectangular openings are formed on the front and rear surfaces. In addition, the periphery of the portion where the mounting hole 31 is formed protrudes toward the inner peripheral side of the leg piece portion 22, and a thick portion 32 having a larger thickness than the other portions of the leg piece portion 22 is formed. ing.

  In addition, a plurality of reinforcing ribs 34 are formed on the back surface side of the frame portion 28, and a plurality of engaging pieces 35 project from the back surface side.

  Therefore, the cover body 11 is attached to the case body 14 by engaging the hook 11a of the case body 11 in the mounting hole 31 with the leg piece portion 22 fitted to the outer peripheral portion of the case body 14. The airbag 16 is covered with the portion of the planned door portion 27 of the plate portion 21, and the engagement piece 35 is engaged with the back side of the instrument panel 3, so that the instrument panel 3 is positioned and the instrument panel 3 is positioned. The surface side of the cover body 11 and the surface side of the cover body 11 are arranged so as to be flush with each other, that is, smoothly.

  Further, the leg piece portion 22 of the cover body 11 has a curved surface at a position along the inner peripheral side, that is, the hinge portion 25 side that is the airbag 16 side, and a portion that is in contact with the back surface side of the front plate portion 21. A first thin portion 41 is formed which is recessed in the shape of the leg piece portion 22 and has a thickness dimension smaller than the adjacent portion. Further, the front plate portion 21 of the cover body 11 is formed in a curved shape along the inner peripheral side of the leg piece portion 22, and the thickness of the front plate portion 21 is smaller than the adjacent portion. 42 is formed, and the hinge portion 25 is formed by the second thin portion 42. The surface formed by the second thin portion 42 is continuous with the surface formed by the first thin portion 41 in a smooth curve, and the curved surface formed by the first thin portion 41 and the second thin portion 42 is as follows. , From the intermediate position of the leg piece portion 22 to the intermediate position of the planned door portion 27 of the front plate portion 21, and the linear peripheral portions 41a, 42a respectively at the inner peripheral surface of the leg piece portion 22 and the front plate portion 21. It touches the back side.

  Further, the front plate portion 21 of the cover body 11 is positioned along the outer peripheral side, that is, on the side opposite to the hinge portion 25 with respect to the leg piece portion 22 and in contact with the back surface side of the front plate portion 21. A third thin-walled portion 43 is formed by being recessed in a curved shape.

  Furthermore, the cover body 11 includes a plurality of triangular plate-like reinforcing ribs 45 that integrally connect the back surface side of the planned door portion 27 of the front plate portion 21 and the leg piece portion 22 at a predetermined interval. Is formed. The reinforcing rib 45 connects the portion where the first thin portion 41 and the second thin portion 42 are formed, that is, from the position of the edge 41a of the first thin portion 41 to the position of the edge 42a of the second thin portion 42. It is formed to do.

  Therefore, when an automobile equipped with the airbag device 1 collides, the control means activates the inflator based on the impact detected by the sensor, and the airbag 16 is inflated by the gas supplied from the inflator. The tear line 24 of the cover body 11 is broken by the pressure applied to form a door portion 47 shown by a two-dot chain line in FIG. A protrusion is formed, and the airbag 16 is deployed from the protrusion to the front of the occupant. The airbag 16 restrains and protects the occupant thrown forward. Further, in the tear line 24, the first tear line 24a is normally broken from the center portion, and then the second tear lines 24b on both sides are broken, and the progress of the breaking is stopped by the regulation tear line 24c.

  Then, according to the present embodiment, the airbag for the passenger on the passenger seat is formed integrally with the front plate portion 21 exposed to the outside and the leg piece portion 22 protruding from the back surface side of the front plate portion 21. The cover portion 11 of the apparatus 1 can be smoothly deployed on the door portion to improve the deployment performance, and the appearance of the surface, that is, the appearance quality can be improved.

  That is, since the first thin portion 41 is formed by recessing the base end portion of the leg piece portion 22 on the front plate portion 21 side, the occurrence of sink marks in the front plate portion 21 at the leg piece portion 22 portion is suppressed. In addition, the improvement in appearance can be easily suppressed. In this configuration, the strength of the hinge portion 25 can be easily ensured as compared with the configuration in which the thickness dimension of the adjacent hinge portion 25, that is, the second thin portion 42 is reduced. Note that the thin-walled portion that suppresses this sink can also be formed by recessing the base end portion of the leg piece portion 22 on the front plate portion 21 side from the opposite side of the hinge portion 25, that is, the outer peripheral side.

  Further, since the first thin portion 41 is formed continuously to the second thin portion 42 constituting the hinge portion 25, the door portion 47 can be smoothly deployed even when the hinge portion 25, that is, the door portion 47 is unfolded at a large angle. Thus, the airbag 16 can be smoothly deployed.

  In this way, the first thin portion 41 and the second thin portion 42 can not only improve the smooth opening but also improve the door opening and improve the appearance by suppressing sink marks. The thin-walled portion 42 is formed in a curved shape, and the first thin-walled portion 41 and the second thin-walled portion 42 are connected to each other in a smooth curved shape, thereby improving the function of the hinge portion 25 as a hinge. In addition, the door 47 can be smoothly rotated, and even when a large force is applied when the airbag 16 is deployed, the force is distributed over a wide range of the cover body 11, and the hinge portion 25 and the like are broken. The cover body 11 can be protected without any problems. In addition, when the cover body 11 is molded, the resin material introduced into the mold smoothly flows, and it is possible to provide a high-quality cover body 11 in which the characteristics of each part are uniform.

  Further, it is located on the outer peripheral side of the leg piece part 22, that is, on the opposite side of the hinge part 25 with respect to the leg piece part 22, along the base end part of the leg piece part 22, Since the frame portion 28 is recessed from the back side to form the third thin portion 43, the hinge portion 25, that is, the door portion 47 can be smoothly deployed together with the first thin portion 41 and the second thin portion 42. The appearance can be improved by suppressing sink marks.

  Further, by forming a triangular reinforcing rib 45 connected to the front plate portion 21 and the leg piece portion 22 on the back surface side of the cover body 11, it becomes easy to control the deployment behavior such as the deployment angle of the door portion 47. In addition, it is possible to secure rigidity when the surface side of the front plate portion 21 of the cover body 11 is pushed and to improve the so-called stickiness.

  Moreover, each thin part 41,42,43 can be easily formed with a metal mold | die, or can also be easily formed by the post-process after shaping | molding with a metal mold | die, and can suppress manufacturing cost.

  In addition, about the edge part of each thin part 41,42,43, in addition to making it linear, a step part can also be formed. For example, as shown in FIG. 5, the first thin portion 41 and the second thin portion 42 can be stepped portions on the edge portions 41 b and 42 b on the side away from each other.

  In the above-described embodiment, the configuration including the pair of front and rear door planned portions 27 partitioned by the plane substantially H-shaped tear line 24 has been described. However, the configuration is not limited to this configuration. For example, the substantially C-shaped tear line is provided. It can also be set as the structure provided with one door planned part divided by.

  Further, the tear line 24 may not be broken depending on the state of development in addition to the case where the tear line 24 is broken over the entire length.

  Moreover, the cover body 11 of the airbag apparatus 1 can be applied to a cover body of an airbag apparatus installed at an appropriate position such as an automobile or other moving body in addition to the passenger seat occupant provided in the instrument panel 3. .

  The present invention can be applied to, for example, a cover body of an airbag device for a passenger on a passenger seat provided in an instrument panel of an automobile.

It is explanatory drawing of the II equivalent cross section position of FIG. 4 which shows one Embodiment of the cover body of the airbag apparatus of this invention. It is a perspective view of the state which reversed the upper and lower sides which shows a cover body same as the above. It is a perspective view which shows a cover body same as the above. It is a top view which shows a cover body same as the above. FIG. 6 is a partial cross-sectional view showing another embodiment of the cover body of the airbag device of the present invention.

1 Airbag device
11 Cover body
16 airbag
21 Front plate
22 Leg piece
25 Hinge
27 Door planned part
29 Non-expanded part
41 1st thin part
42 Second thin part
43 3rd thin part
45 Reinforcement rib

Claims (2)

Covers the front side of the stored airbag and expands when the airbag is inflated, a non-deployed part adjacent to the scheduled door, and a deformable connecting the non-deployed part and the scheduled door A front plate portion having a hinge portion,
Leg pieces formed by integrally projecting from the position along the hinge portion on the back side of the non-deployed portion of the front plate portion,
A plate-like reinforcing rib that integrally connects the front plate portion and the leg piece portion;
The leg piece portion includes a first thin portion having a thickness dimension smaller than a portion adjacent to the leg piece portion along the door planned portion side which is the hinge portion side of the position in contact with the front plate portion,
The hinge portion has a curved surface, is continuous with the first thin portion, has a back surface side of the front plate portion that is recessed, and has a second thin portion that is smaller in thickness than an adjacent portion of the front plate portion. With
The reinforcing rib is integrally projected from a portion where the first thin portion of the leg piece portion is provided and a portion where the second thin portion of the planned door portion of the front plate portion is formed. A cover body for an airbag device, characterized in that it forms a triangular plate shape to be connected. A third surface having a thickness dimension smaller than that of the adjacent portion of the front plate portion on the back surface side of the front plate portion, on the opposite side of the hinge portion with respect to the leg piece portion, and along the position in contact with the leg piece portion The cover body of the airbag apparatus according to claim 1, further comprising a thin portion.

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