JPH09240412A - Cabin side member integrally having air bag door part and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the thickness of a foam body layer when necessary by forming a crack portion having a specified depth in a position corresponding to an open and crack schedule line in a cabin side member integrally having a synthetic resin foam body layer in the back surface of a surface material having the open and crack schedule line for plotting an air bag door part. SOLUTION: The opening part of the upper part of an air bag housing conister 51 housing an air bag device 50 is covered with an air bag door part 11 formed integrally with a cabin side member 10 and in the cabin side member 10, an open and crack schedule line 14 is formed in a surface material 12 having a synthetic resin foam body layer 13 formed integrally in its back surface. In this case, a crack portion 15 having a depth not reaching the open and crack schedule line 14 from the back surface side is formed in a position corresponding to the open and crack schedule line 14 of the foam body layer 13. Thus, when an air bag A is expanded by an impact and the back surface of the air bag door part 11 is pushed up, the foam body layer 13 is quickly ruptured along the shape of the open and crack schedule line 14 and then the door part 11 is surely opened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle interior side member integrally provided with an airbag door portion and a method for manufacturing the same.

[0002]

2. Description of the Related Art Recently, as shown in FIGS. 10 and 11, an airbag is installed inside a vehicle-side member 60 such as an instrument panel in a passenger seat of a vehicle in order to safely protect an occupant from a collision. A device may be provided. In this airbag device 50, a folded airbag A is stored in an airbag storage container 51 together with an airbag operating device I. An upper portion of the airbag storage container 51 is configured as an opening portion for the airbag A to be deployed in the vehicle compartment, and is covered by an airbag door portion 61 formed integrally with the vehicle compartment side member 60. . In the airbag device 50, when the automobile receives a large impact, the operating device I operates so that the inflated airbag A pushes up the airbag door portion 61 from the inside and opens it into the vehicle compartment. Has become.

The illustrated passenger compartment member 60 is of a type in which an air bag door portion 61 is provided integrally with the general portion 60A, and reference numeral 62 shown in FIG. 11 is a skin material made of a soft plastic such as vinyl chloride, and 63. Is a synthetic resin foam layer integrally formed on the back surface thereof, 64 is a planned cleavage line formed on the skin material 62, and 65 is a general portion 60A of the passenger compartment member.
A base material (core layer) made of a hard synthetic resin plate constituting the
6 is a reinforcing plate that constitutes the airbag door portion 61 made of a metal plate or the like, and B is a base material of the passenger compartment-side member 65 and the reinforcing plate 66 of the airbag door portion and the flange portion 52 of the airbag storage container 51 are integrally formed. It is a mounting member (bolt and nut) that is connected. The mounting member B serves as a hinge portion when the airbag door portion 61 is opened.

A planned tear line 64 formed at a predetermined position on the back surface or the front surface of the skin material 62 defines the airbag door portion 61, and the expansion of the airbag A causes the skin material 6 to be broken.
2 is broken along the shape of the airbag door portion 61 to quickly open the door portion 61. The planned tear line 64 is configured by a notch formed by laser light or the like, a V groove formed by molding, or a fastening structure (fastener structure) that is easily broken, so that the breaking line 64 is broken by the inflation pressure of the airbag. It has become.

By the way, the above-mentioned one relates to a type in which an air bag door portion is integrally provided on a vehicle interior side member, and separately from this, an air bag door portion is separately formed and is preformed on the vehicle interior side member. Although the type to be mounted in place is also widely used, it is not necessary to say that the former integrated type has a great advantage in manufacturing, assembling, etc., as compared with the latter separately molded type. However, in this integral type, although the advantages in manufacturing and assembling are great, there is a problem that the synthetic foam layer formed on the back surface side of the skin material cannot have a sufficiently large thickness in relation to its breakability. is there.
However, in the case of a fastener (locking) structure in which the end of the skin material enters the inside of the synthetic resin foam layer, there is a demand that the thicker the foam layer at that portion is, the better the moldability is. Even in the skin structure having other notches and V-grooves, there is a demand that the synthetic resin foam layer below the planned cleavage line defining these door portions has a large thickness in terms of strength.

[0006]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above problems and demands, and is one in which an air bag door portion is integrally provided on a member on the vehicle interior side. Accordingly, the present invention aims to provide a structure capable of increasing the thickness of the synthetic resin foam layer, dramatically improving this kind of airbag door structure, and diversifying the structure, and a manufacturing method thereof.

[0007]

That is, the invention of claim 1 relates to the structure of a vehicle interior side member integrally provided with an airbag door portion, and a planned tear line defining the airbag door portion is formed. In the vehicle interior side member in which the synthetic resin foam layer is integrally formed on the back surface of the skin material, the back surface of the synthetic resin foam layer is located at a position corresponding to the planned cleavage line of the skin material of the synthetic resin foam layer. It is characterized in that a tear portion having a depth not reaching the scheduled cleavage line of the skin material from the side is formed.

Further, the invention of claim 2 relates to a method for manufacturing a vehicle interior side member integrally provided with an airbag door portion, wherein the skin material is provided with a planned cleavage line which defines the airbag door portion. When the synthetic resin foam layer is formed integrally with the skin material by setting it in the foam molding die so that the surface is the mold surface side and injecting the foam resin material into the back surface side of the skin material, the skin material is scheduled to be cleaved. At the position corresponding to the line, the foam resin material is injected and formed while arranging the crevice forming member so as not to reach the skin material, and the crevice forming member is formed on the back surface of the synthetic resin foam layer during the molding process. The synthetic resin foam layer is made to recede to a side to form a split portion having a depth that does not reach the scheduled cleavage line of the skin material from the back surface side of the synthetic resin foam layer.

Further, in the invention of claim 3, in the manufacturing method of claim 2, the crevice forming member is composed of a linear member or a plate member which is configured to be retractable.

The invention of claim 4 is the same as that of claim 2
Alternatively, in the manufacturing method of 3, the cut portion forming member has a cutout portion through which the foamed resin material can flow.

[0011]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing an embodiment of a vehicle interior side member of the present invention, FIG.
FIG. 4 is an enlarged cross-sectional view of a main part showing another embodiment, FIG. 4 is a cross-sectional view showing an example of a foaming mold for carrying out the manufacturing method of the present invention, and FIG. 7 is a partial perspective view, FIG. 6 is a cross-sectional view showing the main part of the tear part forming member, and FIG.
6 is a sectional view showing a state in which the tear portion forming member is retracted in FIG. 6, FIG. 8 is a perspective view showing an example of an airbag door reinforcing plate, and FIG. 9 is a perspective view showing another example of the tear portion forming member. is there.

According to the present invention, as shown in FIG. 10 described above, a synthetic resin foam layer is integrally formed on the back surface of a skin material in which an airbag door portion is defined by a planned tear line. It is preferably used for a member, and its cross section is shown in FIG. Reference numeral 10 in FIG. 1 is a vehicle interior side member, 10A
Is a general part thereof, 11 is an airbag door part, 12 is a skin material, 13 is a synthetic resin foam layer, and 14 is a planned cleavage line. Further, reference numeral 20 is a base material (core layer) of the vehicle interior side member general portion 10A made of a hard resin plate, and 21 is a reinforcing plate of the airbag door portion 11 made of a metal plate. The same reference numerals as those in FIG. 11 relating to the airbag device indicate the same members.

In this embodiment, the planned cleavage line 14 is a V groove formed from the surface side of the skin material 12, and is formed in an "H" shape as shown by a broken line in FIG. It is designed to be divided into openings. The planned cleavage line 14 is not limited to the V groove from the front surface side of the skin material 12 as shown in the figure, but may be a V groove provided from the back surface side of the skin material, a U groove, or a perforation.

As can be understood from FIGS. 1 and 2, the synthetic resin foam layer 13 has a planned cleavage line 14 of the skin material 12.
To the position corresponding to
A crevice portion 15 is formed to a depth that does not reach the planned cleavage line 14. When the airbag A inflates due to impact and pushes up the back surface of the airbag door portion 11 (particularly, the reinforcing plate 21 thereof), the crevice portion 15 has a large thickness of the synthetic resin foam layer 13 in the planned cleavage line 14 portion. Even in this case, the synthetic resin foam layer 13 is promptly broken along the shape of the planned cleavage line 14 to surely open the airbag door portion 11.

The depth of the split portion 15 can be appropriately determined depending on the material of the skin material 12, the structure of the planned cleavage line 14 and the material and thickness of the synthetic resin foam layer 13. In addition, the formation form of the split portion 15 is the same as the skin material 1
Any material may be used as long as it can easily tear the synthetic resin foam layer 13 when the airbag door 11 is opened without adversely affecting the surface of the visible portion 2. It does not necessarily have to be formed in a precise straight line shape, and may have a meandering shape due to its formation.

According to this structure, the synthetic resin foam layer is provided with the split portion at a position corresponding to the planned cleavage line of the skin material, and the inflation pressure of the airbag is effectively applied to the airbag door portion. Can be opened quickly and reliably. In particular, when the planned tear line that delimits the airbag door is made into a shape that is easy to break, such as a thin wall, even if the synthetic resin foam layer is thickened to reinforce its strength reduction, the opening of the airbag door will still open. The airbag can be smoothly deployed without hindering it.

The planned cleavage line is not limited to the thin portion as shown in FIGS. 1 and 2. FIG. 3 shows another embodiment of the planned cleavage line. The planned cleavage line 34 formed on the passenger compartment member 30 of FIG. 3 is formed by the skin material 32 and the bent joint portion of the 33 end portion which enter the inside of the synthetic resin foam layer 13. Flange portions 35 and 36 are formed at the ends of the skin materials 32 and 33, and are bent toward the back surface along the planned cleavage line 34.
Engagement portions 37 and 38 that can be superposed and coupled to each other are provided on the portions 5 and 36. In this example, the engaging portions 37 and 38 forming the planned cleavage line 34 are shown as ridges provided along the flange portions 35 and 36 and concave portions into which the ridges can be fitted. Such a structure is generally called a fastener type.

In such a fastener (attachment) type, since the skin materials 32 and 33 enter the inside of the synthetic resin foam layer 13, it is preferable to make the synthetic resin foam layer 13 thick to some extent in terms of molding. . However, if the synthetic resin foam layer 13 is made thick, an unfavorable problem will occur in the cleaving function of the airbag door. In such a case, if the split portion 15 of the present invention is formed in the synthetic resin foam layer 13, both requirements can be satisfied and the problem can be solved. In FIG. 3, the same reference numerals as those in FIG. 2 denote the same members. As described above, according to the present invention, it is possible to greatly expand the range of the configuration of the planned cleavage line formed on the skin material, the design of the structure, and the selection.

Next, the manufacturing method described in claims 2 and below will be described. In this manufacturing method invention, when a skin material is set in advance on the mold surface of the foam molding die, a foaming resin material is injected inside the skin material to form a synthetic resin foam layer integrally with the skin material. The present invention relates to a method for forming the above-mentioned fissure.

As shown in FIG. 4, the foaming mold 40 of this embodiment comprises a lower mold 41 and an upper mold 42, and a molded product cavity 43 in the shape of a member on the passenger compartment side is formed by mold clamping.
The skin material 12 is set on the mold surface 41s of the lower mold 41 with the surface thereof facing the mold surface. Also, the mold surface 42s of the upper mold 42
The base material 20, which is the back side of the vehicle interior side member, and the airbag door reinforcement member 21 are disposed in the vehicle by an appropriate method. And
In the upper mold 42, the split portion forming member 4 is provided at a position corresponding to the planned cleavage line 14 of the skin material 12 arranged in the lower mold 41.
5 are arranged.

The crevice forming member 45 is for forming a crevice having a predetermined depth in the synthetic resin foam layer of the vehicle interior side member as described above, and the mold surface on the side where the skin material 12 is not arranged. It is provided on (the upper mold surface 42s in this example) and protrudes into the molded product cavity 43 to a depth that does not reach the planned cleavage line 14 portion of the skin material 12 from the mold surface. An example thereof is shown in FIGS. 5 and 6. As can be understood from FIG. 5, the split portion forming member 45 of this embodiment is made of a linear member (wire) having an appropriate thickness, and is bent and formed into a shape that substantially matches the planned cleavage line 14. In this example, a metal wire having a diameter of 0.5 to 1.0 mm is used for the linear member.

As shown in FIG. 6, the crevice forming member 45 is held in the cavity 43 while being urged by the spring 46 provided in the upper die 42 in the direction of the planned cleavage line 14 of the skin material 12. And the dashed line 45 in FIG.
Like P, it is configured to be retractable (pull out) in the direction of the mold surface. Reference numeral 47 in FIG. 6 is an operating member integrally formed with the tear portion forming member 45, 48 is a spring receiving member integrally formed with the operating member 47, 49 is a casing, and S is a sealing material.

Then, as shown in FIG. 7, during molding, while the foaming resin material P injected to the back surface side of the skin material 12 is in the process of foaming and hardening, the operating member 47 is pulled out in the direction of arrow R, and the split portion forming member 45 is pulled out. By retreating to the upper mold surface 42s, the synthetic resin foam layer 13 being formed is divided at an arbitrary depth. In this way, the split portion 15 is formed in the synthetic resin foam layer 13 from the back surface side thereof to a depth not reaching the planned cleavage line 14. The timing for retracting the tear portion forming member 45 during molding and curing can be appropriately determined depending on the viscosity and reaction rate of the foamed resin material used. It is not impossible even after foaming and curing. By using a linear member (wire) for the split part forming member 45 as in this example, the fluidity of the foamed resin material injected into the mold is not impaired at all, and as shown in the figure, the mold surface direction is increased. Easily retracted to make the crevice 15
Can be formed. Further, it is desirable to apply a release agent to the tear forming member 45 in advance.

After completion of the foaming reaction, the mold is opened and the molded product is taken out. In the obtained molded product, the airbag door portion defined by the planned cleavage line is integrally formed, and the synthetic resin foam layer does not reach the planned cleavage line at a position corresponding to the planned cleavage line. Depth crevices are formed.

As shown in the figure, the upper mold 42 is provided with a reinforcing plate 21 for the air bag door, and the crevice forming member 45 is advanced and retracted through the notch 22 of the base material 21. FIG. 8 is a diagram showing an example of the reinforcing plate 21 of the airbag door portion. The reinforcing plate 21 is provided with a notch 22 along the shape of the planned tear line, and the tear portion forming member 45 has the notch 22 as shown by a chain line in the drawing.
You can move back and forth freely.

The crevice forming member 45 may be anything as long as it can form a crevice in the synthetic resin foam layer, and may be a plate-like member other than the above-mentioned linear member. FIG. 9 shows an example thereof. The tear portion forming member 45A of FIG.
Is a plate-like member formed in the shape of the planned cleavage line.
An appropriate number of notches C are provided on the plate surface of the tear portion forming member 45A. This notch C is for maintaining the fluidity of the foamed resin material when the split portion forming member 45A is placed in the mold and molded, and in addition to the notch through which the foamed resin material can flow, Such holes may be used. The notch C is appropriately formed according to the viscosity of the foamed resin material, the thickness of the synthetic resin foamed layer, and the like. In addition, in the plate-shaped tear portion forming member 45A having such a width, it may be better to retract the foam-hardening stage in the mold to a certain extent or after the foam-hardening treatment.

[0027]

As shown and described above, according to the vehicle interior side member integrally provided with the airbag door portion of the present invention,
In the synthetic resin foam layer, since a tear portion having a depth that does not reach the planned cleavage line is formed at a position corresponding to the planned cleavage line of the skin material, the airbag does not impair the appearance of the airbag door portion and the airbag. By the expansion pressure at the time of expansion, the synthetic resin foam layer can be reliably broken from the crevice.

Since the synthetic resin foam layer has improved rupture properties, conventionally, due to the cleaving function of the airbag door,
Even if the thickness of the synthetic resin foam layer could not be increased, the thickness of the synthetic resin foam layer can be increased if necessary, and this kind of airbag door structure is dramatically improved, Moreover, various problems in molding and the like have been solved. As a result, it has become possible to greatly expand and diversify the range of various configurations, structure designs, and selections of planned cleavage lines applied to the skin material.

Further, according to the manufacturing method of the present invention, the split portion forming member is arranged in the molding die at a depth that does not reach the scheduled cleavage line of the skin material set in the molding die. Since the tear portion is formed by retracting the tear portion forming member to the back surface side of the synthetic resin foam layer, the tear portion can be formed easily, reliably, and efficiently.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a vehicle interior side member of the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is an enlarged cross-sectional view of a main part showing another embodiment.

FIG. 4 is a cross-sectional view showing an example of a foaming mold for carrying out the manufacturing method of the present invention.

FIG. 5 is a partial perspective view showing a mold surface on the side where a split portion forming member is provided.

FIG. 6 is a cross-sectional view showing a main part of a tear part forming member.

7 is a cross-sectional view showing a state in which the split portion forming member is retracted in FIG.

FIG. 8 is a perspective view showing an example of a reinforcing plate of an airbag door portion.

FIG. 9 is a perspective view showing another example of the split portion forming member.

FIG. 10 is a perspective view of a conventional passenger compartment side member integrally provided with an airbag door portion.

FIG. 11 is a sectional view of the airbag door portion.

[Explanation of symbols]

 10 Vehicle Side Member 11 Airbag Door Part 12 Skin Material 13 Synthetic Resin Foam Layer 14 Expected Break Line 15 Rip Part 20 Base Material (Core Layer) 21 Airbag Door Reinforcing Plate 40 Foam Mold 41 Lower Mold 42 Upper Mold 45 Rip part forming member

Claims (4)

[Claims] 1. A passenger compartment-side member in which a synthetic resin foam layer is integrally formed on the back surface of a skin material on which a planned cleavage line that defines an airbag door portion is formed, wherein the skin of the synthetic resin foam layer is formed. An airbag door portion, characterized in that a tear portion having a depth not reaching the scheduled cleavage line of the skin material is formed from the back surface side of the synthetic resin foam layer at a position corresponding to the scheduled cleavage line of the material. A passenger compartment side member that is integrally equipped with. 2. A skin material on which a planned cleavage line that defines an airbag door is formed is set in a foam molding die with its front surface facing the mold surface, and a foam resin material is injected on the back surface side. When molding a synthetic resin foam layer integrally with the skin material, the foamed resin material is arranged at a position corresponding to the planned cleavage line of the skin material while disposing a crevice forming member so as not to reach the skin material. While injecting and forming, the crevice forming member is retracted to the back surface side of the synthetic resin foam layer in the course of molding, and a depth not reaching the planned cleavage line of the skin material from the back surface side of the synthetic resin foam layer. A method for manufacturing a vehicle-cabin-side member integrally provided with an airbag door portion, characterized in that a split portion is formed. 3. The method for manufacturing a vehicle interior side member according to claim 2, wherein the split portion forming member is integrally provided with an airbag door portion made of a linear member or a plate member configured to be retractable. 4. The method for manufacturing a vehicle interior side member according to claim 2, wherein the split portion forming member is integrally provided with an airbag door portion having a cutout portion through which the foamed resin material can flow.