JP2003182496A - Airbag door tearing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an airbag door tearing structure in which the tearing of an airbag door is smoothly advanced, any stress concentration to the airbag is prevented, and the targeted inflating direction and inflation shape of the airbag can be obtained. <P>SOLUTION: Two second desired tearing lines 32c and 32c in a desired tearing line 32 provided on at least a base member 12 form each branched part in the vicinity thereof from both ends 32d of a first desired tearing line 32a of a smooth curve. Two second desired tearing lines 34c and 34c at a desired tearing line 34 provided on a surface material 14 are respectively branched straight from both ends 34d of the first desired tearing line 34a. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaving structure of an air bag door, and more specifically, to a base material constituting a vehicle interior member and a skin material applied to an outer surface of the base material, and A planned cleavage line that allows opening of the airbag door in the bag device is formed. The planned cleavage line is a first planned cleavage line that extends linearly in the center of the airbag door, and a first planned cleavage line. It is composed of two second planned cleavage lines extending obliquely in a V shape from both ends, and the airbag is inflated to correspondingly break the first planned cleavage line and the second planned cleavage line. Thus, the present invention relates to a cleaving structure of an airbag door, which opens the airbag door.

[0002]

2. Description of the Related Art In recent years, most passenger cars are equipped with a driver-side airbag device and a passenger-side airbag device as standard equipment in order to protect an occupant from a shock such as a collision accident. It is like this. Therefore, in the instrument panel 10, as shown in FIG. 5, the airbag 2 that has started to inflate when the airbag device 24 is activated is located at a position aligned with the airbag device 24 for the passenger seat.
An airbag door 30 is provided which opens to the passenger compartment side when a pressing force of 6 is applied.

The instrument panel 10 includes a panel base material 12 formed into a required shape, and the panel base material 1.
2 is a two-layer type in which a skin material 14 is adhered to the outer surface, a three-layer type in which a cushion material 16 is interposed between the panel base material 12 and the skin material 14, and both members 12, 14 is widely used for implementation. (The three-layer type is illustrated in FIG. 5). In the instrument panel 10 as described above, the planned base material cleavage line 32 and the planned skin cleavage line 34 are formed to extend on the panel base material 12 and the skin material 14, respectively, and when the airbag device 24 is actuated. When the pressing force of the inflated airbag 26 is applied, each of the planned tear lines 32 and 34 is broken, so that the panel substrate 12
Part of the skin, part of the skin material 14 and cushion material 16
A part of the air bag door 30 is integrally opened to the outside.

Since the panel base material 12 which is the main body of the instrument panel 10 is a molded member formed of a relatively hard synthetic resin material such as PP (polypropylene) or ASG, the air is Bag door 3
When 0 is formed integrally with the base material 12, there is a possibility that the airbag 26 will inflate and deploy at an allowable lower limit level, especially at low temperatures. For this reason, in recent years, as shown in FIG. 5, the mounting opening 18 is provided at a portion of the panel substrate 12 corresponding to the airbag device 24.
TPO (olefin-based thermoplastic elastomer)
A door molding member 20 formed of a relatively soft and flexible synthetic resin material such as is attached to the mounting opening 18 as a part of the panel base material 12, and the airbag door 30 is provided on the door molding member 20. It is becoming. Therefore, the base material cleavage line 32 is formed to extend on the back surface of the plate-shaped portion 22 in the door molding member 20, and the plate-shaped portion 22 serves as the airbag door 30 by breaking the cleavage line 32. It will open up.

[0005]

In the airbag door 30, as shown in FIG. 6, for example, the planned base material cleavage line 32 and the epidermal cleavage line 34 are provided in the airbag door 30.
First planned cleavage lines 32a, 34 extending linearly in the center of the
a and a second planned cleavage line 32b, 34b extending from both ends of the first planned cleavage line 32a, 34a so as to branch in an I-shape, the instrument is formed into a substantially H shape as a whole. The double-open type, which is composed of two horizontally long rectangular door panels 30A and 30B that open in the front-rear direction of the panel 10, is mainly used. However, the planned cleavage line 32
When the planned epidermal cleavage line 34 is formed to extend in an H-shape, the first planned cleavage lines 32a, 24a and the second planned cleavage lines 32b, 34b branch and extend at a substantially right angle. , The following inconvenience is feared. That is, in the panel base material 12 (door molding member 20), the cleavage that starts from the first planned cleavage line 32a in the planned substrate cleavage line 32 does not proceed smoothly to the second planned cleavage line 32b that extends in the perpendicular direction. Therefore, there is a risk that the airbag 26 may be inflated and deployed at the allowable lower limit level with the delay in opening the door panels 30A and 30B. On the other hand, in the skin material 14, there is a possibility that the cleavage that started at the first planned cleavage line 34a in the planned epidermal cleavage line 34 may not smoothly progress to the second planned cleavage line 34b that extends in the perpendicular direction.

Therefore, in order to improve the above-mentioned inconvenience of the double-opening type airbag door 30, as shown in FIG.
The base material planned cleavage line 32 and the epidermal cleavage planned line 34 are
First planned cleavage lines 32a, 34a extending linearly in the center of the airbag door 30 and the first planned cleavage lines 32a, 34
Second planned cleavage lines 32c and 34c extending from both ends (left end and right end) 32d and 34d of a in a V-shape obliquely.
By forming a substantially Y-shaped shape as a whole, two horizontally long trapezoidal door panels 30A and 30B that open in the front-rear direction of the instrument panel 10 and two triangular door panels that open in the left-right direction. 30C, 30D
A four-way open type airbag door 30 is proposed. In this way, when the base material planned cleavage line 32 and the epidermal cleavage planned line 34 are formed to extend in both Y-shapes, the first planned cleavage lines 32a, 34a and the second planned cleavage lines 32c, 34c.
Since the junction bifurcation angle with is obtuse, the cleavage that started at the first planned cleavage lines 32a, 34a is the second planned cleavage line 3
It will proceed smoothly to 2c and 34c. Therefore, the opening delay of each door panel 30A, 30B, 30C, 30D is less likely to occur, and the cleavage of the skin material 14 is facilitated to proceed smoothly, so that the above-mentioned inconveniences can be avoided.

However, as is apparent from FIG. 8, in the base material cleavage line formed on the door molding member 20, two second branch lines branched from the first cleavage line 32 into a V-shape.
Since the planned cleavage lines 32c, 32c are joined in a straight line, the left and right door panels 30C, 30D have a triangular shape with open end edges having a pointed shape. Therefore, the airbag device 24 is activated and the left and right door panels 30C, 3
When 0D is stopped in the substantially vertical state, the open side edge of the door panel 30C, 30D having the pointed shape is the airbag 2.
There is a risk that the stress concentration on the airbag 26 will increase due to interference with No. 6 and the inflation direction and the inflation shape of the airbag 26 will not be as intended (allowable lower limit level).

[0008]

DISCLOSURE OF THE INVENTION The present invention has been proposed in order to preferably solve the above-mentioned problems, and makes the progress of the tearing of the airbag door smooth and prevents the stress concentration on the airbag to prevent the airbag. An object of the present invention is to provide a cleaving structure for an airbag door in which an inflation direction and an inflation shape are as intended.

[0009]

SUMMARY OF THE INVENTION In order to solve the above problems and achieve a desired object, the present invention provides a base material constituting a vehicle interior member and a skin material applied to the outer surface of the base material, respectively. In the airbag device, a planned tear line that allows opening of the airbag door is formed, and the planned tear line is a first tear line that extends linearly in the center of the airbag door and the first tear line. It is composed of two second planned cleavage lines extending obliquely in a V shape from both ends of the planned line, and the airbag is inflated to correspond the first planned cleavage line and the second planned cleavage line to each other. In the cleaving structure of the airbag door, which is configured to open the airbag door by breaking into two, at least two second planned cleaving lines in the planned cleaving line provided in the door molding member are first cleaving plans. Neighboring parts branched from both ends of the line And characterized in that the a gentle curve.

Another object of the present invention to solve the above problems and achieve the intended purpose is to provide a door molding member attached to a base material constituting an interior member of a vehicle, and a cover for the outer surface of the base material and the door molding member. A planned tear line that allows opening of the airbag door in the airbag device is formed in each of the skin materials to be worn, and the planned tear line is a first tear line that extends linearly in the center of the airbag door. The predetermined planned line and two second planned planned cleavage lines extending obliquely from both ends of the first planned planned cleavage line in a V shape are formed. The airbag is inflated and the first planned cleavage line and In a cleaving structure of an airbag door, which is configured to open the airbag door by correspondingly breaking a second planned cleavage line, at least two second cleaving lines provided at the door molding member at the planned cleavage line. Schedule line is the first cleavage Characterized in that the respective branched portions gentle curve in the vicinity of the both ends of the constant linear.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a cleaving structure of an airbag door according to the present invention will be described below with reference to the accompanying drawings with reference to preferred embodiments. In the present embodiment, FIG.
The instrument panel 10 shown in FIG. 1, that is, a three-layer type including the panel base material 12, the cushion material 16 and the skin material 14, and a door molding separately molded on a portion of the panel base material 12 corresponding to the airbag device 24. An instrument panel in a form in which the member 20 is attached as a part of the panel base material 12 is illustrated. Therefore, FIG.
In FIG. 8, the same members and parts as those already mentioned are
The same reference numerals are given to indicate.

FIG. 1 is a partial plan view of an instrument panel showing a partially opened structure of a cleaving structure of an airbag door according to a preferred embodiment of the present invention. The airbag door 30 in which the cleaving structure of the present embodiment is implemented has four door panels 30A, 30B, 30C, 3 as in FIGS. 7 and 8.
0D, the panel base material 12 (door molding member 20) and the skin material 14 are formed with two Y-shaped base material planned cleavage lines 32 and skin planned cleavage lines 34, respectively. . The planned base material cleavage line 32 and the planned skin cleavage line 34 are thinly formed by the groove provided on the back surface, and the planned substrate cleavage line 32 is formed at the same time when the door molding member 20 is molded. The planned line 34 is formed by a hot blade or the like after the skin material 14 is molded.

(Planned base material cleavage line) The planned base material cleavage line 32 formed on the plate-like portion 22 of the door molding member 20 forming a part of the panel base material 12 is a flat surface as shown in FIGS. 1 and 2. The plate-shaped portion 2 is formed so as to extend in a substantially double Y shape.
The first of the required length that extends straight to the left and right at the approximate center of 2
Expected cleavage line 32a and second expected cleavage line that extends obliquely in a V shape from both side ends of the first expected cleavage line 32a and extends toward each corner of the plate-like portion 22. 32c. In FIG. 1, the two second planned cleavage lines 32c, 32c branching from the left end 32d of the first planned cleavage line 32a in a V shape are located in the vicinity of the respective left ends 32d of the first planned cleavage line 32a. The part extends in a gentle curve. As a result, the second planned cleavage line 3
The substantially triangular door panel 30C on the left side of the drawing formed by breaking at 2c and 32c has a curved open side edge so as not to have a pointed shape (FIG. 3). On the other hand, in FIG. 1, two second planned cleavage lines 32c, 32 branching in a V shape from the right end 32d of the first planned cleavage line 32a.
Similarly, in c, the portions near the left end 32d of the first planned cleavage line 32a branch off from each other and extend in a gently curved shape. Accordingly, the substantially triangular door panel 30D on the right side of the drawing formed by the rupture along the second planned cleavage lines 32c, 32c also has a curved edge on the open side so as not to have a pointed shape. (Figure 3).

(Planned Skin Cleavage Line) The planned skin cleavage line 34 formed on the back surface of the skin material 14 has a planar shape extending in both Y-shapes as shown in FIG. 1 and FIG. A first planned cleavage line 34a extending in a long straight line, and four predetermined lengths of a required length extending in a V-shape obliquely from both end portions of the first planned cleavage line 34a. 2 planned cleavage line 34c
It consists of and. The epidermal cleavage line 34 is formed in the same shape as the conventional one shown in FIGS. 7 and 8, and the first expected cleavage line 34a and the second expected cleavage line 34c.
The junction branch angle with is an obtuse angle (about 140 to 150 degrees). In such an epidermal cleavage line 34, the cleavage that started at the intermediate portion of the first cleavage line 34a is the cleavage portion 3
After proceeding to both ends of 4a, each second planned cleavage line 34c
It is designed to proceed smoothly to.

As described above, in the cleaving structure of the airbag door according to the present embodiment, the branching shape at the planned substrate cleaving line 32 extendingly formed in the door molding member 20 forming a part of the panel substrate 12, and the skin material. The planned splitting line 34 of the epidermis extending from 14 is branched into different splitting line shapes. Specifically, in the base material planned cleavage line 32 extending and formed in the door molding member 20 forming a part of the panel base material 12, the second planned cleavage line 32c branched from the first planned cleavage line 32a into a V shape. However, the portions near the left end 32d and the right end 32d of the first planned cleavage line 32d are each made into a gentle curve, and at the planned epidermal cleavage line 34 extended and formed in the skin material 14, from the first planned cleavage line 34. The second planned cleavage line 34c that branches in a V shape is a V-shaped straight line having the left end 34d and the right end 34d of the first planned cleavage line 34 as vertices. The radius of the curved line portion of the second planned cleavage line 32c in the planned substrate cleavage line 32 is the first
It is set so as to satisfy the respective conditions that the cleavage from the planned cleavage line 32a to the second planned cleavage line 32c proceeds smoothly and the stress concentration on the airbag 26 is appropriately prevented, and the cleavage progresses smoothly. When it is important to set it, it is desirable to set it as small as possible.

[0016]

In the door molding member 20 which forms a part of the panel base material 12, the pressing force of the airbag 26, which is actuated by the airbag device 24 and starts to expand, is the door molding member 2.
When it is applied to the back surface of the plate-shaped portion 22 at 0, first, a cleavage is caused at a substantially intermediate portion of the first planned cleavage line 32a in the planned cleavage line 32 of the base material, and the cleavage started at this portion is the first planned cleavage. The line 32a is instantaneously advanced toward both ends. Next, when the cleavage along the first planned cleavage line 32a is completed, at the same time, the cleavage progresses to the respective second planned cleavage lines 32c branched in a V shape, and the cleavage at each second planned cleavage line 32c is also instantaneous. To progress to.

On the other hand, in the skin material 14, the tearing progresses substantially at the same time as the first planned tearing line 32, and the pressing force of the airbag 26 which has started the inflation by the operation of the airbag device 24 is the plate in the door forming member 20. When added to the back surface of the rib portion 22, first, the first planned cleavage line 3 in the planned epidermal cleavage line 34.
Cleavage is induced at a substantially intermediate portion of 4a, and the cleavage started at this portion instantaneously progresses toward both side ends of the first planned cleavage line 34a. Next, when the cleavage along the first planned cleavage line 34a is completed, at the same time, the cleavage smoothly progresses to the respective second planned cleavage lines 34c branched in the V shape, and the cleavage at each second planned cleavage line 34c. Will also proceed instantly.

Since the junction branch angle between the first planned cleavage line 34a and the second planned cleavage line 34c is an obtuse angle at the planned epidermal cleavage line 34, the first planned cleavage line 34a to the second planned cleavage line 34c. Cleavage into 34c proceeds smoothly. Therefore, the inflation time of the airbag 26 is exactly as intended.

When the cleavage along the base material cleavage line 32 and the epidermis cleavage line 34 is completed, the door panels 30A, 30B, 30 receiving the pressing force of the airbag 26.
As shown in FIG. 3 and FIG. 4, C and 30D are bent at their respective hinge lines 36, and the instrument panel 10 is bent.
It will open to the outside at once. Here, the left side door panel 30C formed by the cleavage of the second planned cleavage lines 32c, 32c branched from the left end of the planned substrate cleavage line 32 into a substantially V shape, and the right end of the planned substrate cleavage line 32 The right door panel 30D formed by the cleavage of the second planned cleavage lines 32c, 32c branched in a substantially V shape has the respective second planned cleavage lines 32c, 32c branching in a V shape from the first planned cleavage line 34a. Is the left end 3 of the first planned cleavage line 34a.
Since the portions near 4d and the right end 34d branch off from each other have a gentle curve, no pointed shape is formed on the open side edge. Therefore, for example, each door panel 30C,
When the opening of the door panel 30C is stopped in a substantially vertical state, the open side edges of the door panels 30C and 30D do not protrude outwardly of the instrument panel 10 in a pointed manner. On the other hand, although not shown, when the door panels 30C, 30D do not open to a vertical state but stop in an inclined state, the open side edges of the door panels 30C, 30D extend in a pointed shape toward the airbag passage opening. Since it does not come out, the stress concentration on the inflating and expanding airbag 26 is minimized, and the inflating direction and the inflating shape of the airbag 26 are aimed at.

As described above, in the cleaving structure of the airbag door according to the present embodiment, the door panels 30A, 30B which are opened by the cleaving at the substrate cleaving line 32 provided on the door molding member 20 forming a part of the panel substrate 12. , 30C, 30D (particularly the door panels 30C, 30D) do not have a pointed shape, the stress concentration on the airbag 26 is suppressed to the minimum, and the inflation direction and the inflation shape of the airbag 26 are as intended. Further, in the skin material 14, since the skin material 14 is smoothly cleaved at the scheduled skin cleaving line 34, it is possible to prevent scattering of the skin fragments.

In the above-mentioned embodiment, the base material cleavage line 3 provided on the door molding member 20 forming a part of the panel base material 12 is used.
2 to the second planned cleavage line 32c, the first planned cleavage line 3
The portions near the left end 32d and the right end 32d of 2a are each made into a gentle curve. In addition to this, the second planned cleavage line 34c in the planned skin cleavage line 34 provided on the skin material 14 is also the first cleavage line. The portions near the left end 34d and the right end 34d of the planned line 34a may be gently curved.

In the above-mentioned embodiment, the split structure in the airbag door 30 provided in the door molding member 20 attached to the panel base material 12 in the three-layer type instrument panel 10 is illustrated, but the present application is intended. The opening structure of the airbag door is not limited to this form.
That is, the airbag door provided in the two-layer type instrument panel 10 in which the skin material 14 is attached to the outer surface of the panel base material 12 is also targeted, and the panel base material 12 is also used.
The airbag doors provided on itself are also included.

[0023]

As described above, according to the cleaving structure of the airbag door according to the present invention, the open side edge of the airbag door provided on the base material does not have a sharp shape, so that stress concentration on the airbag is concentrated. Is minimized and the inflating direction and the inflating shape of the airbag are aimed at.

Similarly, according to the air bag door cleaving structure of the present invention, the open side edge of the air bag door provided on the door molding member attached to the base material does not have a pointed shape. Stress concentration is minimized, and the inflating direction and the inflating shape of the airbag are effectively aimed.

[Brief description of drawings]

FIG. 1 is a partial plan view of an instrument panel showing a partially opened state of a cleaving structure of an airbag door according to a preferred embodiment of the present invention.

FIG. 2 is a schematic perspective view of a door molding member that is formed as a part of a panel base material and is attached to the panel base material, and that is provided with a first cleavage portion and an airbag door.

[Fig. 3] When a pressing force of an airbag is applied, each door panel is opened by the panel base material (door molding member) being cleaved at the planned base material cleavage line and the skin material being cleaved at the planned skin cleavage line. It is a schematic perspective view showing a state, and shows that the open side edge of each of the left and right door panels having a substantially triangular shape is not sharp.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a partial cross-sectional view of an instrument panel of a three-layer type including a panel base material, a cushion material, and a skin material, in which an air bag door is provided in a door molding member that constitutes a part of the panel base material.

FIG. 6 is a double-sided airbag door including two door panels provided with H-shaped cleavage lines extending from the door molding member and the skin material that form a part of the panel base material. It is a partially broken perspective view of an instrument panel.

FIG. 7 is a four-way opening type airbag door composed of four door panels by extending both Y-shaped planned cleavage lines on a door molding member and a skin material forming a part of a panel base material. It is a partially broken perspective view of the instrument panel provided.

8 is a schematic perspective view showing a state in which each door panel is opened when a pressing force of the airbag is applied in the airbag door shown in FIG. 7, and the left and right door panels having a substantially triangular shape are opened. It shows that the side edges are pointed.

[Explanation of symbols]

10 Instrument panel (vehicle interior material) 12 panel base material (base material) 14 Skin material 20 Door molding 26 airbags 30 airbag door 32 Substrate cleavage line 32a First planned cleavage line 32c Second cleavage line 32d Left end, right end (both ends) 34 Expected epidermal cleavage line 34a First cleavage line 34c Second cleavage line 34d Left end, right end (both ends)

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Toshiyasu Funato             Aichi Prefecture Anjo City Imaikecho 3 1-336 Stock             Inoac Corporation Anjo Business             In-house (72) Inventor Kenji Ogawa             1 Toyota Town, Toyota City, Aichi Prefecture Toyota Auto             Car Co., Ltd. (72) Inventor Toshinori Kunishima             25 Araco, Kamifujiike, Yoshiwara-cho, Toyota-shi, Aichi             Within the corporation F-term (reference) 3D044 BA07 BB01 BC03 BC15                 3D054 AA07 AA14 BB08 BB16 BB23

Claims (4)

[Claims] 1. An air bag door in an air bag device is provided on each of a base material (12) constituting a vehicle interior member (10) and a skin material (14) adhered to an outer surface of the base material (12). A planned tear line (32, 34) allowing the opening of the (30) is formed, and the expected tear line (32, 34) is a first planned tear line extending linearly in the center of the airbag door (30). (32a, 34a) and two second planned cleavage lines (32c, 34c) extending obliquely in a V shape from both ends (32d, 34d) of the first planned cleavage line (32a, 34a). ) And the airbag (26) is inflated and the first planned tear line (32
a, 34a) and the second planned cleavage line (32c, 34c) are correspondingly broken to open the airbag door (30), wherein at least the base material (12) ), The two second planned cleavage lines (32c, 32c) in the planned planned cleavage line (32) branch off from both ends (32d) of the first planned cleavage line (32a), respectively. The opening structure of the airbag door is characterized by being curved. 2. A door molding member (20) attached to a base material (12) constituting a vehicle interior member (10), and adhered to outer surfaces of the base material (12) and the door molding member (20). Planned cleavage lines (32, 34) that allow the opening of the airbag door (30) in the airbag device are formed in each of the skin material (14), and the planned cleavage lines (32, 34) are the airbags. A first cleavage line (32a, 34a) extending linearly in the center of the door (30) and a V-shaped slant from both ends (32d, 34d) of the first cleavage line (32a, 34a) It is composed of two second planned cleavage lines (32c, 34c) extending in a branched manner, and the airbag (26) is inflated to cause the first planned cleavage line (32).
a, 34a) and the second planned cleavage line (32c, 34c) are correspondingly broken to open the airbag door (30), at least the door molding member (30) The two planned cleavage lines (32c, 32c) in the planned cleavage line (32) provided in 20) are the first
A cleaving structure for an airbag door, characterized in that a portion near each of the two ends (32d) of the planned cleavage line (32a) is gently curved. 3. A planned cleavage line (34) provided on the skin material (14)
The structure for cleaving an airbag door according to claim 1 or 2, wherein the two second planned cleavage lines (34c, 34c) in the first branching line (34d) are branched from the respective ends (34d) of the first planned cleavage line (34a). . 4. A planned cleavage line (34) provided on the skin material (14)
The two second planned cleavage lines (34c, 34c) in each of the first and second planned cleavage lines (34a) are branched off from both ends (34d), respectively. Opening structure of bag door.