JP2014148296A - Airbag lid part structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly control the order of cleaving a cleavage line.SOLUTION: In an airbag lid member structure which is H-shaped in a bottom face view, an airbag lid member 5 comprises door parts 7, 8 for forming an opening part 6 in which a bag-shaped airbag body 3 is expanded, and the door parts 7, 8 are defined by a cleavage line 9 formed on a rear side of the airbag lid member 5. The cleavage line 9 includes a lateral cleavage line part 11 extending in a lateral direction and a pair of longitudinal cleavage line parts 12 extending in a longitudinal direction through both end portions of the lateral cleavage line part 11. Between the lateral cleavage line part 11 and the pair of longitudinal cleavage line parts 12, two door parts 7, 8 can be formed. In the longitudinal cleavage line parts 12, an opening time difference generation part 31 is formed for starting cleaving the lateral cleavage line part 11 in a shear mode by deviating the timing to open the two door parts 7, 8.

Description

  The present invention relates to an air bag grid part structure that can correctly control the order of cleavage of the cleavage line.

  An airbag device is installed as a safety device for protecting passengers in an emergency (see, for example, Patent Document 1).

  As shown in FIG. 7, in a vehicle such as an automobile, a vehicle interior front panel such as an instrument panel 1 is installed at the front of the vehicle interior. 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.

  As shown in FIG. 8, the airbag device 2 for a passenger seat described above includes an airbag module 4 that folds and stores a bag-like airbag body 3 and an airbag installed above the airbag module 4. And a grid member 5 (see FIG. 9A).

  The airbag grid member 5 is provided with door portions 7 and 8 for forming an opening 6 (see FIG. 10) through which the bag-shaped airbag body 3 bulges. The door portions 7 and 8 are defined by a tear line 9 formed on the back side of the airbag grid member 5 as shown in FIG. And this cleavage line 9 has the horizontal cleavage line part 11 extended to a horizontal direction, and a pair of vertical cleavage line part 12 extended to the both sides of a vertical direction through the both ends of this horizontal cleavage line part 11, for example. The bottom view is an H-shape. And the two door parts 7 and 8 mentioned above are formed between the horizontal cleavage line part 11 and the pair of vertical cleavage line parts 12 which were H-shaped when viewed from the bottom.

  According to such a configuration, the airbag body 3 is inflated in a bag shape in an emergency. Then, the air bag grid member 5 is pushed by the pressure of the airbag body 3 inflated in a bag shape, and the tear line 9 is cleaved as shown in FIGS. By opening 7 and 8, the bag-shaped airbag body 3 bulges into the vehicle compartment from the opening 6 formed in the airbag grid member 5. The occupant seated at a predetermined position of the seat can be protected and restrained by the expansion of the airbag body 3 into the vehicle interior.

  Here, when the cleavage line 9 is cleaved, it is most ideal that the lateral cleavage line part 11 is first cleaved and the longitudinal cleavage line part 12 is cleaved later.

JP 2002-193059 A

  However, the air bag grid member structure described above has the following problems.

  That is, as shown in FIG. 9, when the two door portions 7 and 8 are opened, the largest pressing force by the airbag body 3 acts on the vicinity 11 a of the central portion of the lateral tear line portion 11. The two door portions 7 and 8 are pushed at the same time and try to open in double doors at the same timing. Therefore, as shown in FIG. 11, the above-described cleavage of the lateral cleavage line portion 11 tends to start in the tension mode.

  Here, the initiation of the cleavage by the pulling mode means that in this case, the portion of the lateral cleavage line portion 11 that defines the distal ends of the two door portions 7 and 8 is the lateral cleavage line portion 11 as shown by the arrows. Cleaving is started by being pulled so as to be separated in a direction orthogonal to each other and along a direction of the air bag grid member 5.

  However, when the lateral cleavage line part 11 is cleaved in the tensile mode, a large force is required, so that the longitudinal cleavage line part 12 is cleaved before the lateral cleavage line part 11 is cleaved. The above-mentioned ideal cleavage state may not be obtained.

In order to solve the above problem, the invention described in claim 1 is:
The airbag grid member is provided with a door portion for forming an opening in which the bag-shaped airbag body bulges,
The door portion is defined by a tear line formed on the back side of the airbag grid member;
A transverse cleavage line portion extending in the transverse direction;
A pair of longitudinal cleavage line portions extending in the longitudinal direction through both end portions of the lateral cleavage line portion,
In the air bag grid portion structure that is formed in an H shape in a bottom view, which can form the two door portions between a lateral cleavage line portion and a pair of vertical cleavage line portions,
An opening time difference generating part is formed, wherein the opening of the two door parts is shifted in the longitudinal cleavage line part to start the cleavage of the lateral cleavage line part in a shear mode. And
The invention described in claim 2 is the above,
The longitudinal cleavage line portion is a cleavage groove formed in the airbag grid member,
The opening time difference generator is
In such a way that the splitting strength of the longitudinal tear line part with respect to the two door parts is different,
It is a bridge part provided unevenly in the cleavage groove of the longitudinal cleavage line part.
The invention described in claim 3 is the above,
The longitudinal cleavage line portion is a cleavage groove formed in the airbag grid member,
The opening time difference generator is
In such a way that the splitting strength of the longitudinal tear line part with respect to the two door parts is different,
It is a shallow groove part provided unevenly in the cleavage groove of the longitudinal cleavage line part.
The invention described in claim 4 is the above,
The longitudinal cleavage line portion is a number of recessed holes formed in the air bag grid member in the form of perforations,
The opening time difference generator is
In such a way that the splitting strength of the longitudinal tear line part with respect to the two door parts is different,
It is a shallow hole part or a pitch expansion part provided unevenly in the sewing machine-like concave hole part of the vertical cleavage line part.
The invention described in claim 5 is the above,
The two door portions are formed to have the same shape and size,
The opening time difference generating unit starts the tearing of the lateral cleavage line portion in a shear mode by shifting the timing so that the rear door portion opens earlier than the front door portion. And

According to the first aspect of the present invention, the following operational effects can be obtained by the above configuration.
That is, by forming the opening time difference generating part in the longitudinal cleavage line part, the opening time difference generating part functions so as to intentionally shift the opening timing of the two door parts. Since the start of is no longer the tension mode described above and becomes the shear mode, the lateral cleavage line portion is much easier to be cleaved than in the case where the cleavage is started in the tension mode. As a result, the lateral cleavage line portion can be stably cleaved first.
Therefore, the order of tearing can be controlled more accurately and reliably, so that the lateral tear line part can be cracked before the longitudinal tear line part, which makes the operation of the airbag device more stable. It becomes possible to make it.
According to the second aspect of the present invention, the following effects can be obtained by the above configuration.
That is, when the longitudinal cleavage line portion is a cleavage groove, the above-described opening time difference generation portion can be actually obtained by providing the bridge portion unevenly with respect to the cleavage groove.
According to the third aspect of the present invention, the following operational effects can be obtained by the above configuration.
That is, when the longitudinal cleavage line part is a cleavage groove, the above-described opening time difference generation part can be actually obtained by providing the shallow groove part unevenly with respect to the cleavage groove.
According to the invention described in claim 4, the following effects can be obtained by the above-described configuration.
That is, when the longitudinal cleavage line portion is constituted by a large number of concave hole portions, the above-described opening time difference generating portion can be actually obtained by providing the shallow hole portion or the pitch expansion portion unevenly with respect to the cleavage groove. Can do.
According to the fifth aspect of the present invention, the following effects can be obtained by the above configuration.
That is, when the shape and size of the two door portions are equal, the transverse cleavage line portion is most likely to be started in the tension mode. Therefore, by providing the opening time difference generating portion described above, it is possible to reliably start the cleavage of the lateral cleavage line portion in the shear mode even when the shape and size of the two door portions are equal. It becomes possible.
And, as described above, the opening time difference generating portion described above opens the rear door portion earlier than the front door portion. In addition to the above, the lateral cleavage line part can be cleaved before the longitudinal cleavage line part, and in addition to the above, the rear door part opened first ensures that the airbag body is directed toward the occupant side. Can be deployed.

It is the perspective view which looked at the air bag grid part structure concerning the Example of this invention from the bottom face side. It is a figure which shows the state which opens a door part with a time difference, (a) is a perspective view, (b) is a side view. It is a partial expansion perspective view which shows a bridge | bridging part. It is a partial expansion perspective view which shows a shallow groove part. It is a partial expansion perspective view which shows a shallow hole part. It is a partial expansion perspective view which shows a pitch expansion part. It is a perspective view of the instrument panel used for description of this invention and a prior art example. It is sectional drawing of FIG. It is a perspective view which shows the state before a door part opens, (a) is a perspective view, (b) is a side view. It is a figure which shows the state which the door part opened, (a) is a perspective view, (b) is a side view. It is a figure which shows the state which opens a door part with a time difference, (a) is a perspective view, (b) is a side view.

Hereinafter, the present embodiment and examples embodying the present embodiment will be described in detail with reference to the drawings.
FIGS. 1-6 shows the Example of this Embodiment, and its modification.
The airbag device 2 for the passenger seat has the same basic structure and will be described with reference to FIGS.

<Configuration> The configuration will be described below.
As shown in FIGS. 7 and 8, in a vehicle such as an automobile, a vehicle interior front panel such as an instrument panel 1 is installed at the front of the vehicle interior.

  And the airbag apparatus 2 for passenger seats is installed with respect to the passenger seat side part of this instrument panel 1 as a safety device for protecting a passenger seat passenger at the time of emergency.

  The airbag device 2 for the passenger seat described above includes an airbag module 4 that folds and stores a bag-shaped airbag body 3 and an airbag grid member 5 that is installed above the airbag module 4. It is supposed to be.

  The lower portion of the airbag module 4 is fastened and fixed to a vehicle body strength member 13 disposed inside the instrument panel 1 via fastening members 14 such as bolts and nuts.

  The upper portion of the airbag module 4 is attached to the back side of the airbag grid member 5 via a resin reinforcing member 15. The resin reinforcing member 15 will be described later.

  The above-described airbag grid member 5 is provided integrally with the above-described instrument panel 1 (so-called instrument-integrated lid), or provided separately from the instrument panel 1 to provide an instrument panel. There is a separate type (so-called instrument separate type lid) that can be attached to the lid mounting opening formed in 1 in a substantially flush state.

  Therefore, in the case of the integral type, the above-described airbag module 4 is directly attached to the inner surface of the instrument integrated lid (airbag grid member 5) portion of the instrument panel 1 (direct attachment type). . In the case of a separate type, the airbag module 4 is attached to the instrument panel 1 (indirectly) together with the separate instrument type lid while being attached to the inner surface of the separate instrument type lid (airbag grid member 5). (Indirect mounting type). In this case, it is an integrated type.

  And in the airbag grid member structure of this Example, the door part for forming in the airbag grid member 5 the opening part 6 (refer to FIG. 10 for the opening part for expansion | swelling) which the bag-shaped airbag main body 3 swells. 7,8 are provided. The door portions 7 and 8 are defined by a tear line 9 formed on the back side of the airbag grid member 5. And the bottom line view in which this cleavage line 9 has the horizontal cleavage line part 11 extended to a horizontal direction, and a pair of vertical cleavage line part 12 extended to the both sides of a vertical direction through the both ends of this horizontal cleavage line part 11 It is assumed to be H-shaped. And two door parts 7 and 8 can be formed between the horizontal cleavage line part 11 and the pair of vertical cleavage line parts 12 which were H-shaped when viewed from the bottom.

  Furthermore, a door outer portion 16 is formed outside the two door portions 7 and 8 described above. The door parts 7 and 8 described above are movable parts that open the opening part 6 by the operation of the airbag module 4, whereas the door outer part 16 described above is a fixed part that surrounds the outer periphery of the door parts 7 and 8. Part.

  As shown in FIG. 8, the resin reinforcing member 15 includes at least two door reinforcing portions 21 and 22 that are welded and fixed to the back surfaces of the door portions 7 and 8, respectively, and the door outer side. The outer peripheral flange portion 23 that is welded and fixed to the back side of the portion 16, and the module mounting frame portion that is provided between the door reinforcing portions 21 and 22 and the outer peripheral flange portion 23 so as to surround the opening portion 6. 24 and the like.

  And since the above-mentioned door reinforcement parts 21 and 22 are formed slightly smaller than the above-described door parts 7 and 8, between the two door reinforcement parts 21 and 22 and the outer peripheral flange part 23, A slit portion 25 that is H-shaped when viewed from the bottom is formed so as to surround the cleavage line 9 that is H-shaped when viewed from the bottom.

  Further, between the door reinforcing portions 21 and 22 and the module mounting frame portion 24, a hinge portion 26 serving as a rotation center when the door portions 7 and 8 and the door reinforcing portions 21 and 22 are opened is provided.

  And the welding rib 28 for performing above-mentioned welding is provided in the surface at the side of the airbag grid member 5 of the above-mentioned door reinforcement parts 21 and 22 or the door outer side part 16. As shown in FIG.

  Further, a locking hole 29 for mounting the airbag module 4 is provided on the side surface of the module mounting frame 24 described above.

  The above-described airbag module 4 is disposed in a state where the upper portion thereof is inserted into the above-described module mounting frame portion 24, and the hook portion 4 a provided on the upper portion is provided with the module mounting frame portion 24. With respect to the locking hole 29 formed on the (front and rear) side surface, the locking hole 29 is inserted and arranged in a loosely fitted state to be locked.

Here, when supplementary explanation is given, the above-mentioned “instrument panel 1” is a hard panel made of a single layer of hard resin material, for example, a soft skin material, an elastic foam layer, and a hard core. Or a multi-layer panel (three-layer panel) having a material. In this case, it is a hard panel.
The above-mentioned “air bag grid member 5” is a panel member made of resin or the like. The airbag grid member 5 has basically a uniform thickness except for exceptional portions.

  The above-described “airbag body 3” has a bag shape as described above, and is developed by injecting a working fluid in an emergency and is inflated into the vehicle interior.

  The above-described “opening 6” is literally formed through the airbag grid member 5 in an emergency so that the airbag body 3 can be inflated into the vehicle compartment through the airbag grid member 5. The opening 6 is substantially rectangular or square.

  The above-described “door portions 7, 8” are provided to form the above-described opening 6 in the air bag grid member 5 in an emergency, and in this case, the above-described opening 6 is set to 2 in the vehicle front-rear direction. The size is divided.

  The above-mentioned “cleavage line 9” is literally a linear portion for cleaving the airbag grid member 5. The cleavage line 9 will be described later.

In this case, the “lateral direction” described above is substantially the vehicle width direction.
The above-mentioned “lateral cleavage line portion 11” literally constitutes a portion extending in the lateral direction (vehicle width direction) of the cleavage line 9.

In this case, the “vertical direction” described above is substantially the vehicle longitudinal direction.
The above-mentioned “longitudinal cleavage line portion 12” literally constitutes a portion extending in the longitudinal direction (vehicle longitudinal direction) of the cleavage line 9. It should be noted that the pair of longitudinal cleavage line portions 12 ”have the same length and the same start and end positions with respect to the vehicle longitudinal direction. Accordingly, as will be described later, the two door portions 7 and 8 have the same shape and size.

  In addition to the basic configuration as described above, the present embodiment has the following configuration.

(Configuration 1)
As shown in FIG. 1 and FIG. 2, by causing the vertical tear line portion 12 to shift the opening timing of the two door portions 7 and 8, the lateral tear line portion 11 is started to be opened in the shear mode. Therefore, the opening time difference generating part 31 is formed.

(Supplementary explanation 1)
Here, “to shift the timing” is to literally open the two door portions 7 and 8 at different timings.

  In this case, the above-mentioned “start in shear mode (cleavage)” means that the lateral cleavage line portion 11 that defines the distal ends of the two door portions 7 and 8 is laterally broken as indicated by arrows in FIG. That is, the cleavage starts upon receiving a force in a direction substantially orthogonal to the line portion 11 and toward the opposite side of the out-of-plane direction of the air bag grid member 5. A more specific aspect is that one of the two door portions 7 and 8 is stopped and the other is moved, or the front end portions of the two door portions 7 and 8 are opposite to each other. For example, cleaving while moving. In this way, when the cleavage is started in the shear mode, the lateral cleavage line portion 11 is relatively easily started by the shearing force.

  On the other hand, “starting in the tension mode (cleavage)” means that in this case, the lateral cleavage line portion 11 that defines the distal ends of the two door portions 7 and 8 is indicated by an arrow in FIG. That is, the cleavage is started by being pulled so as to be separated in the direction substantially perpendicular to the lateral cleavage line portion 11 and along the surface of the air bag grid member 5. A more specific aspect is that when the two door portions 7 and 8 are opened in a double door at the same timing, the two door portions 7 and 8 are torn apart while being pulled apart from each other. Thus, when the cleavage is started in the tension mode, the lateral cleavage line portion 11 is not easily cleaved by the tensile force.

  The “opening time difference generating unit 31” will be described later.

(Configuration 2)
As shown in FIG. 3, the longitudinal cleavage line portion 12 is a cleavage groove 32 formed in the airbag grid member 5.
And the opening time difference generating part 31 is provided unevenly in the cleavage groove 32 of the longitudinal cleavage line part 12 so that the cleavage strength of the longitudinal cleavage line part 12 with respect to the two door parts 7 and 8 is different. The bridge portion 33 is provided.

(Supplementary explanation 2)
Here, the above-mentioned “cleavage groove 32” is a continuous planned cleavage line having a groove shape. The cleavage groove 32 basically has a constant depth (hereinafter referred to as the normal depth of the cleavage groove 32).

  The above-mentioned “cleavage strength” is a force that the longitudinal cleavage line portion 12 can withstand the cleavage.

  The above-mentioned “unevenness” is literally not equal. That is, the opening time difference generating portion 31 is provided in an uneven state with respect to the cleavage groove 32. Alternatively, it means that the case where the opening time difference generating portion 31 is provided equally to the cleavage groove 32 is excluded.

  The above-described “bridge portion 33” is a thick portion extending in the cleavage groove 32 so as to connect the door portions 7 and 8 and the door outer side portion 16. One or a plurality of the bridge portions 33 can be provided for the cleavage groove 32 of each longitudinal cleavage line portion 12.

  And in order to provide the bridge part 33 unevenly, the bridge part 33 is installed more with respect to the one door part 7 and 8 side, for example. Note that the bridge portion 33 is preferably provided in the same manner in the pair of longitudinal cleavage line portions 12. A specific method of providing the bridge portion 33 will be described later.

(Configuration 3)
As another embodiment, as shown in FIG. 4, the longitudinal cleavage line portion 12 is a cleavage groove 32 formed in the airbag grid member 5.
And the opening time difference generating part 31 is provided unevenly in the cleavage groove 32 of the longitudinal cleavage line part 12 so that the cleavage strength of the longitudinal cleavage line part 12 with respect to the two door parts 7 and 8 is different. The shallow groove portion 35 is formed.

(Supplementary explanation 3)
Here, the above-described “shallow groove portion 35” is literally a shallow groove-shaped portion, and the cleavage groove 32 (groove depth) of the longitudinal cleavage line portion 12 is changed to the depth (normal depth) of the other portion. It is assumed that it is formed to be partially shallower than (a). The shallow groove portion 35 can be provided at one place or a plurality of places with a necessary length with respect to a necessary range.

  In order to provide the shallow groove portions 35 unevenly, for example, the shallow groove portions 35 are provided so as to be offset toward the one door portions 7 and 8 side. In addition, it is preferable to provide the shallow groove part 35 in the same manner in the pair of longitudinal cleavage line parts 12. A specific method of providing the shallow groove portion 35 will be described later.

(Configuration 4)
As another embodiment, as shown in FIGS. 5 and 6, the longitudinal cleavage line portion 12 is formed as a large number of recessed hole portions 37 formed in the airbag grid member 5 in a perforated shape.
And, the opening time difference generating part 31 is formed in the machine-like concave hole part 37 of the longitudinal cleavage line part 12 so that the cleavage strength of the longitudinal cleavage line part 12 with respect to the two door parts 7 and 8 is different. The shallow hole portions 38 (see FIG. 5) or the pitch enlargement portions 39 (see FIG. 6) are provided unevenly.

(Supplementary explanation 4)
Here, the above-mentioned “perforated shape” is literally a large number of recessed hole portions 37 (rows of recessed hole portions 37) that are scattered in a line with a constant interval, like a seam of a sewing machine. It is a discontinuous line.

  The above-mentioned “concave hole portion 37” is a hole having a depth that does not reach the surface side of the airbag grid member 5. The concave hole portion 37 basically has a constant depth (hereinafter referred to as a normal depth of the concave hole portion 37).

  The “shallow hole portion 38” described above has a depth that does not reach the surface side of the air bag grid member 5 and is shallower than the depth of the other recessed hole portion 37 (normal hole depth).

  In the above-described “pitch enlarged portion 39”, the interval (pitch) between the perforated concave hole portions 37 is wider than the interval between the other portions between the concave hole portions 37 (hereinafter referred to as normal pitch). It is the part that is.

  You may make it combine the above-mentioned shallow hole part 38 and the pitch expansion part 39. FIG.

  And in order to provide the shallow hole part 38 and the pitch expansion part 39 unevenly, for example, the shallow hole part 38 and the pitch expansion part 39 are installed more with respect to the one door part 7 and 8 side. Like that. In addition, it is preferable to provide the shallow hole portion 38 and the pitch expansion portion 39 in the same manner in the pair of longitudinal cleavage line portions 12. A specific method of providing the shallow hole portion 38 and the pitch expanding portion 39 will be described later.

(Configuration 5)
As described above, the two door portions 7 and 8 are formed so as to have substantially the same shape and size (see FIG. 2 and the like).
Further, as shown in FIG. 2, the opening time difference generating unit 31 shifts the timing so that the rear door portion 8 opens earlier than the front door portion 7, thereby It is assumed that the cleavage is started in shear mode.

(Supplementary explanation 5)
Here, the above-mentioned “shape and size are equal” literally means that the two door portions 7 and 8 divide the above-described opening 6 into two equal parts in the same size and shape. Is done. However, some errors are allowed.

The aforementioned “rear door portion 8” is the door portion 8 located on the passenger side.
The above-mentioned “front door portion 7” is the door portion 7 located on the front window side.

  The above-mentioned “the rear door portion 8 opens before the front door portion 7” literally means that the rear door portion 8 opens at a slightly earlier timing than the front door portion 7. That is. Therefore, the bridge part 33, the shallow groove part 35, the recessed hole part 37, and the pitch expansion part 39 described above are provided on the front door part 7 side (more), so that the tear strength of the front door part 7 is It is made stronger than the tearing strength of the door part 8 on the side.

  When the bridge portion 33, the shallow groove portion 35, the recessed hole portion 37, and the pitch enlargement portion 39 described above are provided concentrated on the distal end side (position close to the lateral cleavage line portion 11) of the front door portion 7, More effective. Moreover, within the range which becomes non-uniform | heterogenous, the bridge part 33, the shallow groove part 35, the recessed hole part 37, and the pitch expansion part 39 should be provided in the rear door part 8 side in order to adjust cleavage strength. Also good.

<Operation> The operation of this embodiment will be described below.
In an emergency, the airbag body 3 is inflated into a bag shape. The airbag grid member 5 is pushed by the pressure of the airbag body 3 inflated in a bag shape, the tear line 9 formed in the airbag grid member 5 is cleaved, and the door portions 7 and 8 are opened, thereby the airbag grid member. The bag-shaped airbag main body 3 bulges out from the opening 6 formed in the vehicle interior into the vehicle interior. By bulging the air bag body 3 into the passenger compartment, it is possible to protect and restrain an occupant seated at a predetermined position of the seat.

  The door portions 7 and 8 can be defined by forming a tear line 9 on the back side of the airbag grid member 5. At this time, the cleavage line 9 has a lateral cleavage line part 11 extending to both sides in the lateral direction and a pair of longitudinal cleavage line parts 12 extending in the longitudinal direction through both ends of the lateral cleavage line part 11 as viewed from the bottom. By making it H-shaped, two door portions 7 and 8 that are opened in a double-tone manner are formed between the lateral cleavage line portion 11 and the pair of vertical cleavage line portions 12.

  When the cleavage line 9 is cleaved, it is most ideal that the lateral cleavage line part 11 is cleaved first and the longitudinal cleavage line part 12 is cleaved later.

  Here, when the two door portions 7 and 8 are opened, the largest pressing force by the airbag main body 3 is applied to the vicinity 11a of the central portion of the lateral tear line portion 11, thereby the two door portions. Nos. 7 and 8 tend to be pushed simultaneously and try to open in double doors at the same timing. Accordingly, generally, the cleavage of the lateral cleavage line portion 11 is started in the tension mode as described above.

  However, when the transverse cleavage line part 11 is cleaved in the tensile mode, a large force is required, so that the longitudinal cleavage line part 12 is cleaved before the lateral cleavage line part 11 is cleaved. There is a possibility that a situation will occur and the ideal cleavage state described above cannot be obtained.

<Effect> According to this embodiment, the following effects can be obtained.
(Operation effect 1)
By forming the opening time difference generating part 31 in the longitudinal cleavage line part 12, the opening time difference generating part 31 functions so as to intentionally shift the opening timing of the two door parts 7 and 8, thereby causing lateral cleavage. Since the start of the cleavage of the line part 11 is not the above-described tension mode and becomes the shear mode, the laterally cracked line part 11 is much easier to be cleaved than in the case where the cleavage is started in the tension mode. As a result, the lateral cleavage line portion 11 can be stably cleaved first.

  Therefore, it is possible to control the cleavage sequence more accurately and surely so that the lateral cleavage line portion 11 can be cleaved before the longitudinal cleavage line portion 12. Can be further stabilized. It should be noted that the timing at which the two door portions 7 and 8 are opened is of course set to be within the range of the purpose of causing the lateral cleavage line portion 11 to be cleaved before the longitudinal cleavage line portion 12. It is.

(Operation effect 2)
When the longitudinal cleavage line portion 12 is the cleavage groove 32, the above-described opening time difference generating portion 31 can be actually obtained by providing the bridge portion 33 unevenly with respect to the cleavage groove 32.

  That is, the portion where the bridge portion 33 is provided in the cleavage groove 32 has a higher cleavage strength than the other portions of the cleavage groove 32, and thus the portion where the cleavage strength is increased by the bridge portion 33 is not compared with the cleavage groove 32. If it is provided evenly, the cleavage of that portion can be delayed. Therefore, it is possible to shift the opening timing of the two door portions 7 and 8 depending on how the bridge portion 33 is installed.

(Operation effect 3)
When the longitudinal cleavage line portion 12 is the cleavage groove 32, the above-described opening time difference generating portion 31 can be actually obtained by providing the shallow groove portion 35 unevenly with respect to the cleavage groove 32.

  That is, the portion where the shallow groove portion 35 is provided in the cleavage groove 32 has a higher cleavage strength than the other portions of the cleavage groove 32, and therefore the portion where the cleavage strength is increased by the shallow groove portion 35 is not compared with the cleavage groove 32. If it is provided evenly, the cleavage of that portion can be delayed. Therefore, the timing of opening the two door portions 7 and 8 can be shifted depending on how the shallow groove portion 35 is formed.

(Operation effect 4)
When the longitudinal cleavage line portion 12 is constituted by a large number of recessed hole portions 37, the opening time difference generating portion 31 described above is provided by providing the shallow hole portions 38 or the pitch expansion portions 39 unequal to the cleavage grooves 32. Can actually get.

  That is, the portion provided with the shallow hole portions 38 or the pitch expansion portions 39 in the large number of recessed hole portions 37 has a higher tearing strength than the other portions of the large number of recessed hole portions 37. If the portion where the cleavage strength is increased by the pitch expanding portion 39 is provided unevenly in the numerous recessed hole portions 37, the cleavage of the portion can be delayed. Accordingly, it is possible to shift the opening timing of the two door portions 7 and 8 depending on how the shallow hole portion 38 or the pitch expansion portion 39 is formed.

(Operation effect 5)
When the shape and size of the two door portions 7 and 8 are equal, the transverse cleavage line portion 11 is most easily started in the tension mode. Therefore, by providing the opening time difference generating part 31 described above, even when the shape and size of the two door parts 7 and 8 are equal, the cleavage of the lateral cleavage line part 11 is reliably started in the shear mode. It becomes possible to do so.

  Then, as described above, the opening time difference generating part 31 described above opens the rear door part 8 so as to open earlier than the front door part 7, thereby breaking the lateral cleavage line part 11 as described above. Can be started in the shearing mode so that the lateral cleavage line portion 11 can be cleaved before the longitudinal cleavage line portion 12, and in addition to the above, the airbag body 3 can be opened by the rear door portion 8 that is opened first. Can be reliably deployed toward the passenger side.

  Although the embodiments of the present invention have been described in detail with reference to the drawings, the embodiments are only examples of the present invention, and the present invention is not limited to the configurations of the embodiments. Needless to say, design changes and the like within a range not departing from the gist of the invention 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 modifications are shown, 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 2 Airbag apparatus 3 Airbag main body 5 Airbag grid member 6 Opening part 7 Door part 8 Door part 9 Cleavage line 11 Lateral cleavage line part 12 Longitudinal cleavage line part 31 Development time difference generation part 32 Cleavage groove 33 Bridge part 35 Shallow groove part 37 Concave Hole 38 Shallow hole 39 Pitch expansion part

Claims (5)

The airbag grid member is provided with a door portion for forming an opening in which the bag-shaped airbag body bulges,
The door portion is defined by a tear line formed on the back side of the airbag grid member;
A transverse cleavage line portion extending in the transverse direction;
A pair of longitudinal cleavage line portions extending in the longitudinal direction through both end portions of the lateral cleavage line portion,
In the air bag grid portion structure that is formed in an H shape in a bottom view, which can form the two door portions between a lateral cleavage line portion and a pair of vertical cleavage line portions,
An opening time difference generating part for starting the cleavage of the lateral cleavage line part in a shear mode is formed by shifting the opening timing of the two door parts in the longitudinal cleavage line part. Airbag grid part structure. The longitudinal cleavage line portion is a cleavage groove formed in the airbag grid member,
The opening time difference generator is
In such a way that the splitting strength of the longitudinal tear line part with respect to the two door parts is different,
The air bag grid part structure according to claim 1, wherein the air bag grid part structure is a bridge part provided unevenly in the cleavage groove of the longitudinal cleavage line part. The longitudinal cleavage line portion is a cleavage groove formed in the airbag grid member,
The opening time difference generator is
In such a way that the splitting strength of the longitudinal tear line part with respect to the two door parts is different,
The air bag grid part structure according to claim 1, wherein the air bag grid part structure is a shallow groove part provided unevenly in the cleavage groove of the longitudinal cleavage line part. The longitudinal cleavage line portion is a number of recessed holes formed in the air bag grid member in the form of perforations,
The opening time difference generator is
In such a way that the splitting strength of the longitudinal tear line part with respect to the two door parts is different,
2. The airbag grid part structure according to claim 1, wherein the air bag grid part structure is a shallow hole part or a pitch expansion part provided unevenly in a sewing machine-like concave hole part of the vertical cleavage line part. The two door portions are formed to have the same shape and size,
The opening time difference generating unit starts the tearing of the lateral cleavage line portion in a shear mode by shifting the timing so that the rear door portion opens earlier than the front door portion. The air bag grid part structure according to any one of claims 1 to 4.