JPH1071907A - Air bag cover for vehicle and its forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular air bag cover and its forming device wherein the hinge part of the air bag cover is stably opened during air bag expansion and its weakening in the lower temperature zone of a core layer is prevented. SOLUTION: This air bag cover is constructed in such a manner that a rib 23e is formed along a hinge part 23A outside the periphery of a lid 26 in the backside of a core layer 23, a through-hole 23b is formed in at least one of the hinge part 23A and a tearing part 23a and a reinforcing layer 24a for covering at least parts of the rib 23e and the backside of the lid 26 is welded to be integral with a surface layer 24 via the through-hole 23b. A cover main body 21 is formed by extruding a hard resin between a laminate and the reinforcing layer 24a, a tearing part forming piece is provided corresponding to the plotting position of the lid 26 in one of moldings and the tearing part 23a is formed by pressing the tearing part forming piece to the cover main body 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover body in which a resin core layer positioned to face an inflation opening of an airbag apparatus body and a skin layer covering the surface thereof are integrally formed.
An instrument or door for which a lid is defined by a cleaved portion cleaved by the inflation pressure of the airbag inflated by the operation of the airbag device body and a hinge portion formed between both ends of the cleaved portion. The present invention relates to a vehicle airbag cover and a method of forming the same.

[0002]

2. Description of the Related Art Conventional types of this type include, for example,
There is one shown in FIG. 8 described in JP-A-1-202550.

In FIG. 1, reference numeral 1 denotes an airbag cover, which comprises a skin layer 24 made of a soft resin and a core layer 2 made of a hard resin.
3 are integrally formed, and the core layer 23 is provided with a cleavage groove 4 for cleaving the cover. Also, this core layer 23
And the skin layer 24 is provided with an insertion hole 5 penetrating therethrough.
The insertion holes 5 are configured to fix the airbag cover 1 to a retainer (not shown) on the vehicle body side with bolts, rivets, or the like.

In the conventional method of molding the airbag cover 1, a resin material for a core layer is injected between a core mold having a ridge having a shape of a cleavage groove 4 and a primary cavity mold (not shown). To form a core layer 23 with a cleavage groove, and then inject a thermoplastic elastomer material for a skin layer between the core mold with the core layer 23 covered and the secondary cavity mold. The airbag cover 1 is formed of the two layers of the skin layer 24 and the core layer 23.

[0005] The airbag cover 1 covers an airbag device main body (not shown). When the airbag is inflated by the operation of an inflator built in the main body, the portion of the cleavage groove 4 is torn by the inflation pressure. 8B, a portion indicated by a dashed line is opened as a hinge portion H.

[0006]

However, in such a conventional device, the hinge portion H is not particularly formed in a hinge shape. There is a problem that the cleavage is propagated and the position of the hinge portion H is not constant, so that the shape of the open molding becomes unstable.

An olefin-based composite resin material is generally used for the core layer 23 of the airbag cover 1. However, since the olefin-based composite resin material has low-temperature embrittlement and is weak against impact force in a low-temperature region, the airbag inflates. When the pressure is applied, the core layer 23 may be crushed and scattered.

Accordingly, an object of the present invention is to provide an airbag cover for a vehicle in which a hinge portion of the airbag cover is stably opened, and embrittlement of a core layer in a low temperature range can be prevented.

[0009]

According to the first aspect of the present invention, there is provided a hard resin core layer which faces an inflation opening of an airbag device body. A cleaving portion which is cleaved by an inflation pressure of an airbag which inflates by the operation of the airbag device body, and both ends of the cleaving portion, on a cover body integrally formed with a soft resin skin layer covering the surface thereof; In a vehicle airbag cover in which a lid is defined by a hinge portion formed therebetween,
A rib is formed along the hinge portion outside the periphery of the lid on the back side of the core layer, and a through hole is formed in at least one of the hinge portion or the cleavage portion of the core layer,
A reinforcing layer covering at least a part or the entirety of each of the rib and the rear surface of the lid is integrally formed with the skin layer through the through hole.

According to the second aspect of the present invention, the hard resin core layer positioned facing the inflation opening of the airbag device main body and the soft resin skin layer covering the surface thereof are integrally formed. A lid is defined on a molded cover main body by a cleaved portion cleaved by an inflation pressure of an airbag inflated by operation of the airbag device and a hinge formed between both ends of the cleaved portion. In the airbag cover, a rib is formed along the hinge portion outside the periphery of the lid on the back side of the core layer, and covers part or all of the rear surface of the lid from the rib via the hinge portion. In addition, a reinforcing layer formed separately is joined.

According to the third aspect of the present invention, the core layer made of hard resin, which faces the inflation opening of the airbag device main body, and the sheet-like skin and foam covering the surface thereof are formed in layers. A cleaved portion which is cleaved by an inflation pressure of an airbag which inflates by the operation of the airbag device, and a hinge formed between both ends of the cleaved portion, on a cover body integrally formed with the fused laminate sheet. In a vehicle airbag cover in which a lid is defined by a portion, a rib is formed along the hinge portion outside the periphery of the lid on the back side of the core layer, and the rib is formed from the rib via the hinge portion. It is characterized in that a reinforcing layer formed separately is joined so as to cover a part or the whole of the rear surface of the lid.

According to the fourth aspect of the present invention, the cover body is formed by injecting a hard resin between the laminate sheet and the reinforcing layer to integrally join the core layer, and forming one of the pair of molds. A molding method in which a cleaved portion forming piece is provided in a mold corresponding to a position where a lid to be cleaved by an inflation pressure of an airbag is formed, and the cleaving portion formed piece is pressed against the cover body to form a cleaved portion. It is characterized by.

According to the fifth aspect of the present invention, a hard resin is injected between the laminate sheet and the reinforcing layer, the core layer is integrally joined, and the cover body is molded and removed from the mold. Thereafter, a cleaved part forming piece for forming a cleaved part corresponding to the defining position of the lid opened by the inflation pressure of the airbag is provided separately from the molding die, and the cover body is formed by the cleaved part forming piece. It is characterized by a molding method in which the cleavage part is pressed and formed so as to be freely shallow.

Here, it is conceivable to use a styrene-based or olefin-based thermoplastic elastomer, which is particularly excellent in low-temperature impact resistance, as the material of the reinforcing layer.

Here, the laminated sheet is a sheet of an appropriate thickness formed from a skin of a vinyl chloride sheet or an olefin sheet rolled by a calender roll machine or the like and a foam obtained by foaming an olefin resin. It refers to a layered sheet obtained by fusing a molded or sliced product (for example, trade name: Toray Pef) by hot roll pressure bonding or the like.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of an airbag cover for an instrument or a door which is an airbag cover for a vehicle according to the present invention will be described with reference to the drawings.

(Embodiment 1) FIGS. 1 (a) and 1 (b) show Embodiment 1 according to the present invention, and FIGS. 1 (a) and 1 (b)
3A and 3B are a perspective view and a sectional view, respectively, showing the configuration and operation of the instrument airbag cover.

1 (a) and 1 (b), reference numeral 20I denotes an instrument airbag cover, and reference numeral 21 denotes a cover formed as a part of the instrument airbag cover 20I and located on the front surface of the airbag device main body 25. The main body. Reference numeral 23 denotes a core layer made of a hard resin, and reference numeral 24 denotes a skin layer made of a soft resin. The skin layer 24 is integrally formed by being fused to the surface of the core layer 23 during molding.

The core layer 23 is provided with a hinge portion 23A extending in the vehicle body width direction (the left-right direction in FIG. 1), and a rib 23e is formed to project from the back surface of the core layer 23 along the hinge portion 23A. The hinge portion 23A and the core layer 2
3, a lid 26 is formed which is surrounded by a cleavage portion 23a which connects both ends of the hinge portion 23A in a substantially U-shape when viewed from the front. Further, the ribs 23f are formed so as to protrude from the back surface of the core layer 23 even below the cleavage portion 23a.

A plurality of reinforcing ribs 23g and columnar bosses 23h are formed at appropriate intervals on the rib 23e projecting in parallel with the hinge portion 23A so as to intersect with the extending direction. The boss 23h is mounted on the vehicle body bracket 31.
, The cover main body 21 is fixed to the vehicle body side.

The hinge portion 23A of the core layer 23 includes
A hinge hole 23c, which is a plurality of through holes 23b having a predetermined interval, is formed on the line, and a part of the skin layer 24 goes around the back surface of the core layer 23 from the hinge hole 23c to form a rib 23e.
And a reinforcing layer 24a fused so as to cover a part or the whole of the rear surface of the lid 26 (all of them are indicated by dotted lines in the figure).
Are formed.

Between the upper and lower ribs 23e and 23f, an inflation opening 25b for allowing the airbag 25a to inflate from the airbag device body 25 is provided on a lid 26 surrounded by a hinge portion 23A and a cleavage portion 23a. They are mounted so as to face each other.

The airbag device main body 25 is fixed to the steering support member 30 via a bracket 30a.

Next, the operation of the instrument airbag cover in the configuration shown in FIGS. 1A and 1B will be described.

That is, the airbag 25a inflates from the inflation opening 25b with the operation of the airbag device main body 25, and the inflation pressure is applied to the rear surface of the lid 26.
3a and the skin layer 24 of the cleavage portion 23a are cleaved, and the lid 26 is forcibly opened with the hinge portion 23A as a fulcrum. Then, the airbag 25a is inflated into the vehicle interior.

At this time, the reinforcing layer 2 which is located on the back surface of the core layer 23 and covers the hinge portion 23A and is fused to the lid 26 is attached to the lid 26.
4a, the hinge portion 23 withstands an impact force.
A is normally opened as a fulcrum.

Further, since the rib 23e is fixed to the vehicle body via the vehicle body bracket 31, the position of the hinge portion 23A of the lid 26 is fixed and becomes a stable fulcrum.

Further, an inflation outlet 25b from which the airbag inflates.
Are located between the upper and lower ribs 23e and 23f, and also serve as a guide when the airbag 25a inflates.

It should be noted that the above-described operation of activating and inflating the airbag is performed instantaneously from the viewpoint of protecting the occupant, which is the purpose of use. Further, even if the core layer 23 made of a hard resin having a so-called low-temperature embrittlement whose physical properties are reduced at a low temperature is used, the skin layer 24 made of a soft resin resistant to the low-temperature embrittlement is used.
Since the core layer 23 is fused from both sides and the reinforcing layer 24a, the low-temperature embrittlement of the core layer 23 and the hinge portion 23A can be prevented.

Hereinafter, the material of the core layer 23 is as follows.
As the polypropylene composite resin material and the material of the skin layer 24, a thermoplastic elastomer (styrene-based, olefin-based, or the like) that maintains good physical properties even at a low temperature range can be considered.

In the first embodiment, the cover body 21 is attached to the instrument airbag cover 20I.
However, the airbag cover 20I may be provided with an opening, and a cover body 21 separate from the airbag cover 20I may be attached to the opening. Further, the present invention may be applied to a single component such as a horn pad for accommodating the airbag 25a or a door cover body.

(Embodiment 2) FIGS. 2 (a) and 2 (b) show Embodiment 2 according to the present invention, and FIGS. 2 (a) and 2 (b)
FIG. 2 is a cross-sectional view of an instrument airbag cover and an explanatory view of a door airbag cover.

The first embodiment (FIGS. 1A and 1B)
The same or equivalent parts as in FIG.

In FIG. 2A, the lid 26 for inflating the airbag 25a is provided with upper and lower ribs 23e, 23e, which project from the back of the core layer 23 at upper and lower positions on the front of the inflation outlet 25b of the airbag 25a. In the center of the lid 26, a horizontal split portion extending linearly in the width direction of the vehicle body is provided in the center of the lid 26 in a substantially H-shape contacting a vertical split portion in the vertical direction at both ends, and A cleavage slit 23d penetrating the core layer 23 is provided.

The split slit 23d is provided only at the center of the horizontal split portion where the inflation pressure of the airbag is initially applied and only at the contact portion between the horizontal split portion and the vertical split portion where the splitting direction of the split portion changes. You may.

The skin layer 24 formed on the surface side of the core layer 23 has a part of the skin layer 24 wrapped around the substantially H-shaped cleavage slit 23d, which is a through hole 23b, and covers the rear surface of the lid 26, and The reinforcement layer 24a is formed over the surface between the ribs 23e and 23f, and the core layer 23 is fused and sandwiched from both sides.

At the roots of the upper and lower ribs 23e, 23f, recesses 23j, 23j are provided in the core layer 23, respectively, so that the core layer 23 has a thin shape that is easily bent. The skin layer 2 on it
4 forms a hinge portion 23A.

In the drawing, the cleavage portion 23a that has been turned around from the cleavage slit 23d is recessed from both sides of the lid 26 in a sectional view to form a thin-walled cleavage portion 23a. 23a of a thin wall depressed from
It may be shaped.

The skin layer 24 is formed of the airbag cover 20.
The skin layer 24 may be provided only in the area of the cover main body 21 which receives the impact without forming the entire surface of the cover layer 21.

In the above configuration, when the airbag 25a is inflated with the operation of the airbag device main body 25, the lid 26 is subjected to the inflation pressure and the thin split slit 2 is formed.
3d, which is cleaved from the roots of the ribs 23e and 23f.
Using the hinge 3j as a hinge, the lid 26 is opened upward and downward in a front view, and the airbag 25a is inflated into the vehicle interior.

FIG. 2B shows a door airbag cover 20D. The same configuration and operation as those of the instrument airbag cover 201 of FIG. 2A are mounted on the door.

That is, in FIG. 2B, a perspective view shows the armrest 2 of the door cover body 21D.
1d1 and the pocket 21d2, an airbag 25
Lid 26 opened by receiving bulging pressure a (shown by dotted line)
Is provided. Then, as shown in the cross-sectional view, the lid 26 is provided with a skin layer 24 formed on the surface side of the core layer 23.
Is a substantially H-shaped cleavage slit 23 which is a through hole 23b.
A part of the skin layer 24 wraps around from d, and a reinforcing layer 24a is formed so as to cover the back surface of the lid 26 and straddle the surface between the upper and lower ribs 23e and 23f, and the core layer 23 is fused and sandwiched from both sides.

The airbag device main body 25 is mounted between the lids 23e and 23f. When the airbag device main body 25 operates, the airbag 25a is opened.
3a, the lid 26 is opened up and down, and the airbag 25a is inflated into the vehicle interior.

Other structures and operations are the same as those of the first embodiment, and the description thereof is omitted.

(Embodiment 3) FIG. 3 shows Embodiment 3 according to the present invention, and FIG. 3 is a sectional view of an instrument airbag cover.

The first embodiment (FIGS. 1A and 1B)
The same reference numerals are given to the same or equivalent parts as those of the second embodiment, and the description is omitted.

FIG. 3 has a cross section substantially similar to that of the first embodiment.

However, the hinge portion 27A of the bulging lid 26 of the airbag 25a is not provided with the hinge hole 23c, which is a through hole 23b. 23, a reinforcing layer 27 formed separately is used instead of the reinforcing layer 24a formed around the back surface of the reinforcing layer 23.
a.

That is, the reinforcing layer 27a is a separately deformable molded product. The rib 23e is formed to project from the back surface of the core layer 23 when the core layer 23 is formed.
And a hinge 23b having a reinforcing layer 27a formed separately is formed by insert molding and joining so as to straddle the rear surface of the lid 26 via the hinge 23A.

In the drawing, the reinforcing layer 27 formed separately is shown.
Although “a” is formed so as to cover the middle of the lid portion 26 via the hinge portion 23A, it may be formed so as to cover almost the entire surface as shown by a dotted line.

Further, the hinge body 23A is provided with a thin hinge 28 in which the surface side of the core layer 23 is recessed in a groove shape along the hinge part 23A of the lid 26 to form the cover body 21.

Accordingly, the operation of the cover main body 21 is as shown in FIG.
Receives the inflation pressure of the airbag 25a,
It is easy to open on the side.

The other configuration and operation are the same as those of the first embodiment, and therefore the description thereof is omitted.

(Embodiment 4) FIG. 4 shows Embodiment 4 according to the present invention, and FIG. 4 is a sectional view of an instrument airbag cover.

The same or equivalent parts as those in the second embodiment (see FIG. 2A) are denoted by the same reference numerals, and description thereof is omitted.

FIG. 4 has a cross section substantially similar to that of the second embodiment.

However, the through hole 2 is provided at the center of the lid 26.
3b is not provided with a cleavage slit 23d, and a lateral groove-like cleavage part 23a is linearly extended in the vehicle width direction at the center of the rear surface of the lid 26, and both ends thereof are vertically grooved cleavage parts extending vertically. A substantially H-shaped cleavage portion 23 abutting on 23a
a is provided.

Further, instead of the reinforcing layer 24a of the second embodiment, a separately formed reinforcing layer 27a is joined to the core layer 23 in correspondence with the core layer 23.

That is, the reinforcing layer 27a is a separately deformable molded product, and is insert-molded and joined so as to straddle the entire rear side of the lid 26 so as to cover the upper and lower hinges 23b.

Therefore, the operation of opening the lid 26 is as follows.
In response to the inflation pressure of the airbag 25a, the airbag 25a is opened from the hinge portion 23A in both the upper and lower directions when viewed from the front, starting from the cleavage portion 23a at the center of the lid 26 under the inflation pressure of the airbag 25a.

The other configuration and operation are the same as those of the second embodiment, and the description is omitted.

(Embodiment 5) FIGS. 5 (a) and 5 (b)
Embodiment 5 according to the present invention is shown in FIGS. 5 (a) and 5 (b).
1 is a sectional view and a perspective view showing an instrument airbag cover and a door airbag cover, respectively.

Note that the same or equivalent parts as those of the fourth embodiment (see FIG. 4) are denoted by the same reference numerals and description thereof is omitted.

FIG. 5A shows a cross section substantially similar to that of the fourth embodiment.

In FIG. 5A, the skin layer 24 (thermoplastic elastomer) of the fourth embodiment is replaced with a laminate sheet 24B.

That is, the skin layer 24 of the fifth embodiment
The sheet-like skin 24b and the foam 24c are integrally heat-sealed to form a so-called laminate sheet 24B. Then, using the laminated sheet 24B, a thermoplastic resin to be the core layer 231 is injected on the back side (foam side), and then the cover body 21 is formed by pressing and pressing three layers integrally. is there.

Further, a reinforcing layer 27a formed separately is integrally joined to the back surface of the cover body 21 by insert molding, and the reinforcing layer 27a is formed at the center of the back surface of the lid 26 formed on the cover body 21. Has a substantially H-shaped groove opening 23a extending linearly in the vehicle body width direction and abutting on a vertical straight line at both ends thereof. The cleavage portion 23a has a groove shape in cross section that reaches the skin 24b of the laminate sheet 24B.

Further, the reinforcing layer 27a formed separately and joined to the back surface of the lid 26 is provided with a slit to be cleaved corresponding to the shape of the cleaved portion 23a.

Next, FIG. 5B shows a perspective view and a sectional view of the door airbag cover.

FIG. 5 (b) shows a laminate sheet 24B as a skin layer and a core layer 231 formed integrally with the laminate sheet, similarly to the instrument airbag cover 20I of FIG. 5 (a). A reinforcing layer 27a formed separately is joined to the rear surface of the rear surface to form a door airbag cover 20D.

The upper and lower ribs 23 are attached to the airbag device main body 25 in the same manner as shown in FIG.
The air bag 25a is mounted between the e and 23f, and the airbag 25a cleaves the cleaving part 23a to open the lid and swell into the vehicle compartment (see Embodiment 2).

The other constructions and operations in FIGS. 5A and 5B are the same as those in the fourth embodiment, and the description thereof will be omitted.

Next, a method for forming an airbag cover for an instrument or a door, which is an airbag cover for a vehicle according to the fifth embodiment (see FIG. 5), will be described with reference to FIGS.

As shown in FIGS. 6 and 7, this molding method is carried out by simultaneously press-molding the laminated sheet 24B and the injected thermoplastic resin for the core layer by the press injection molding apparatus 50.

That is, in FIG. 6, a press injection molding apparatus 50 includes a press machine (not shown), an upper mold 52 (also called a cavity mold) and a lower mold 5 mounted on the press machine.
1 (also referred to as a core mold) and an injection device 53 connected to the lower mold 51.

The resin for the core layer melted by the injection device 53 is injected from the openings of a plurality of nozzles 51b provided on the lower die 51 through the flow path 51a connected to the injection device 53. The nozzle 51b is provided with an opening / closing valve 54 for opening and closing the nozzle 51b via an opening / closing device 55. Further, a suction hole 51d is provided at a position where the reinforcing layer 27a formed separately, which is joined to the rear side of the lid 26, is inserted so that the vacuum pump 56 can suck the same.

The cleavage 23 of the lid 26 of the lower mold 51
In the position of a, a cleavage part forming piece 51c is provided in the shape of the cleavage part 23a, and simultaneously with the mold clamping, the cleavage part forming piece 51c is provided.
Is slightly cut into the skin 24b, for example, at a height where the skin 24b remains about 0.3 mm.

In the press injection molding method having the above structure, as shown in FIG. 6, first, in the injection step, the reinforcing layer 27a formed separately is attached to the lid 26 on the lower mold 51, and the vacuum pump is used. It is adsorbed via 56 and fixed to the lower mold 51. Further, the laminated sheet 24B cut into a predetermined size is inserted on the lower mold 51.

When the insertion of the laminate sheet 24B is completed, the injection resin 53 injects the molten resin 60 for the core layer while starting the mold clamping operation. At this time, the switching device 5
5 is moved, and a predetermined amount is ejected onto the lower mold 51 from each nozzle 51b according to the set value of the opening / closing time of each nozzle 51b.

Subsequently, as the molding die 51A is clamped in the mold clamping step, the molten resin 6 injected onto the lower mold 51 is removed.
No. 0 is expanded by receiving a press pressure between the laminate sheet 24B and the surface of the lower mold 51, and the core layer 231 is formed. Then, the surface of the foam 24c of the laminate sheet 24B is melted and fused at the temperature of the molten resin for the core layer to be integrally formed. At the same time, lower mold 5
The reinforcing layer 27a formed separately and adsorbed on the upper surface 1 is also integrally formed with the core layer 231 so as to cover the rear surface of the lid 26 from the upper and lower ribs 23e and 23f.

At the same time, the cleaved portion forming piece 51c provided on the lower mold 51 is moved to the laminate sheet 2 as the mold is clamped.
4B crushes the foam layer which is difficult to get into, and the tip is a skin layer 24.
b is formed so as to form a slightly cleaved portion 23a (see an enlarged sectional view of the cleaved portion 23a in FIG. 6).

When the molding is completed with the molding die 51A, the mold is released, and the molding of the cover main body 21 having the cleavage portion 23a is completed.

FIG. 7 is a cross-sectional view showing a part of the cover body 21 removed from the mold, and shows a state in which the cleavage portion 23a is formed by post-processing.

That is, the upper view of FIG. 7 shows a state in which the cleaved portion forming piece 51c is about to be pressed toward the cleaved portion 23a from the reinforcing layer 27a formed separately.

The lower die shows a state in which the cleavage portion forming piece 51c is pressed to form the cleavage portion 23a.

In other words, the cleaved portion forming piece 51c, such as a heater-equipped or ultrasonic horn, provided separately from the cleaved portion 2
3a. Then, by pressing the cleaved portion forming piece 51c, the core layer 231 is cut from the reinforcing layer 27a, the foam 24c is crushed, and further pressed so that the skin 24b has about half a dent to form the cleaved portion 23a. The method for forming the cleavage part 23a is shown.

The method of forming the cleaved portion 23a is determined by judging the airbag inflation state, and the pressing stroke of the cleaved portion forming piece 51c is freely adjusted by the cover body 21.
The depth of a can be determined. For example, the cleavage portion 23a
The central cleavage start may be deeper than the others.

[0088]

As described above, according to the first aspect of the present invention, the rib is formed along the hinge portion outside the periphery of the lid on the back side of the core layer, and the hinge portion of the core layer is formed. Or a through hole is formed in at least one of the cleavage parts,
A reinforcing layer that covers at least a part or the entirety of each of the rib and the rear surface of the lid is integrally formed with the skin layer through the through hole.

Therefore, the hinge portion is covered with the wrapped reinforcing layer, and the hinge strength is improved. Further, the reinforcing layer covering the lid surface from both sides can prevent the low-temperature embrittlement of the core layer.

Therefore, when the airbag inflation pressure is applied in a low temperature range, the hinge strength is maintained, so that the hinge is not cut off from the hinge. In addition, the core layer may be crushed and scattered in the lid. And the lid can be opened normally.

According to the second aspect of the present invention, a rib is formed along the hinge portion outside the peripheral edge of the lid on the back side of the core layer, and a part of the rear surface of the lid is formed from the rib via the hinge portion. Alternatively, a reinforcing layer formed separately is joined so as to cover the whole.

Therefore, as in the case of the first aspect, the hinge portion is covered with the reinforcing layer formed separately and joined, and the hinge strength is improved. Furthermore, since the lid is covered on the front side by the skin layer and the back side is covered on both sides by the reinforcing layers formed separately, low-temperature embrittlement of the core layer can be prevented.

Therefore, when the airbag is inflated in a low temperature range, the hinge strength is maintained, the hinge is not damaged, and the core layer of the lid may be crushed and scattered. Disappears.

Furthermore, since the reinforcing layer formed separately is bonded to the back surface of the lid, it is not necessary to use the same layer as the expensive skin layer which emphasizes the appearance, and it is formed as an inexpensive separate layer corresponding to the strength. It is possible to use a material selected as a reinforcing layer and molded separately. Therefore, cost can be reduced.

According to a third aspect of the present invention, a rib is formed along the hinge portion outside the periphery of the lid on the back side of the core layer, and a part of the rear surface of the lid is formed from the rib via the hinge portion. Alternatively, a reinforcing layer formed separately is joined so as to cover the whole.

Therefore, the hinge portion is reinforced because the reinforcing layer formed separately from the back side can be joined to the molded product in which the laminate sheet and the core layer are simultaneously formed. Further, the lid is covered on the front side with a laminate sheet and the back side is covered with a reinforcing layer formed separately so as to be sandwiched from both sides, so that the core layer can be prevented from being brittle at low temperatures.

Therefore, when the airbag inflation pressure is applied in a low temperature range, the hinge strength is maintained, the hinge portion is not damaged, and there is no danger of the core layer of the lid being crushed and scattered. The normal lid can be opened.

Further, since the separately formed reinforcing layer is formed and joined at the same time when the laminate sheet and the core layer are formed, the productivity is good. Therefore, the production cost can be reduced.

According to the fourth aspect of the present invention, the cover body is formed by injecting a hard resin between the laminate sheet and the reinforcing layer to integrally join the core layer, and forming one of the pair of molds. A forming method for forming a cleavage portion by providing a cleavage portion forming piece corresponding to a position where the lid is opened by the inflation pressure of the airbag, and pressing the cleavage portion forming piece against the cover body.

Therefore, the laminate sheet and the reinforcing layer formed separately are inserted into the molding die, and the thermoplastic resin for the core layer is injected between the two to form the mold while clamping the mold. Thus, it was established that the molding method of the hinge reinforcing portion and the molding method of the low-temperature embrittlement preventing structure of the lid were simultaneously performed.

Furthermore, when shaping, the lower die incorporates the formed piece of the cleavage part, so that the periphery of the lid is formed with the cleavage part simultaneously with the core layer shaping.

As described above, all the structures are molding methods formed at the time of shaping, and the productivity is good. Therefore, the production cost is reduced.

According to a fifth aspect of the present invention, a hard resin is injected between the laminate sheet and the reinforcing layer to integrally join the core layers, and the cover body is molded in a molding die and then released. A cleaved part forming piece for forming a cleaved part corresponding to the position of the lid opened by the inflation pressure of the airbag is provided separately from the mold, and the cover body is pressed by the cleaved part forming piece. A forming method capable of forming the cleavage portion freely and shallowly.

Therefore, while feeding back the result of the cleavage of the lid when the airbag is inflated, an appropriate cleavage groove can be formed by changing the pushing amount of the molded piece of the cleavage part. Therefore, it is not necessary to correct the molding die, and the cost can be reduced.

Also, the output method of the cleaved part molded piece (for example,
(Nichrome wire heating, high-frequency heating, ultrasonic waves, etc.) is easy to select, and it is possible to form a stable cleavage groove without dispersion by an output method that matches the material and grade of the skin and foam layer. Can be. Therefore, the opening quality of the lid is stably improved.

[Brief description of the drawings]

FIG. 1 (a) is a perspective view showing an instrument airbag cover according to Embodiment 1 of the present invention.
FIG. 2B is a sectional view taken along line AA of FIG. 1 according to the first embodiment.

FIG. 2A is a cross-sectional view showing an instrument airbag cover according to the second embodiment. (B)
FIG. 4 is an explanatory view showing an airbag cover for door trim according to the second embodiment.

FIG. 3 is a sectional view showing an instrument airbag cover according to the third embodiment.

FIG. 4 is a sectional view showing an instrument airbag cover according to the fourth embodiment.

FIG. 5A is a cross-sectional view showing an instrument airbag cover according to the fifth embodiment. (B)
FIG. 9 is an explanatory diagram showing a door trim airbag cover according to Embodiment 5.

FIG. 6 is an explanatory view showing a method of forming the instrument airbag cover according to the fifth embodiment.

FIG. 7 is an explanatory view showing a method of forming a cleavage part according to another alternative according to the fifth embodiment.

FIG. 8A is a cross-sectional view (a cross-sectional view taken along line II of FIG. 8B) of a conventional airbag cover for a vehicle.
FIG. 2B is a plan view of the vehicle airbag cover of the conventional example.

[Explanation of symbols]

 20I ... vehicle airbag cover 21 ... cover body 23 ... core layer 23A ... hinge part 23a ... cleavage part 23b ... through hole 23e ... rib 24 ... skin layer 24a, 241 ... reinforcement layer 25 ... airbag device body 25b ... inflation port 26: lid 51A: molding die 51c: cleaved part molded piece

Claims (5)

[Claims] 1. A cover body in which a hard resin core layer positioned to face an inflation opening of an airbag apparatus body and a soft resin skin layer covering the surface thereof are integrally formed with the cover body. An airbag cover for a vehicle, wherein a lid is defined by a cleaved portion cleaved by an inflation pressure of an airbag inflated by operation of a main body and a hinge portion formed between both ends of the cleaved portion; A rib is formed along the hinge part outside the periphery of the lid on the back side, and a through hole is formed in at least one of the hinge part or the cleavage part of the core layer,
An airbag cover for a vehicle, wherein a reinforcing layer covering at least a part or the whole of each of the rib and the rear surface of the lid is integrally formed with the skin layer through the through hole. 2. A cover body in which a hard resin core layer positioned to face an inflation opening of an airbag apparatus body and a soft resin skin layer covering the surface thereof are integrally formed with the airbag apparatus. A rear surface of the core layer, wherein a lid is defined by a cleaved portion cleaved by the inflation pressure of the airbag inflated by the operation of the airbag and a hinge portion formed between both ends of the cleaved portion. A rib is formed along the hinge portion outside the periphery of the lid on the side, and covers part or all of the rear surface of the lid from the rib via the hinge portion.
An airbag cover for a vehicle, wherein a reinforcing layer formed separately is joined. 3. A hard resin core layer which faces an inflation opening of an airbag device main body, and a laminated sheet in which a sheet-like skin and a foam covering the surface thereof are fused in a layered manner. A lid is defined on a molded cover main body by a cleaved portion cleaved by an inflation pressure of an airbag inflated by operation of the airbag device and a hinge formed between both ends of the cleaved portion. In the airbag cover, a rib is formed along the hinge portion outside the periphery of the lid on the back surface side of the core layer, and covers part or all of the rear surface of the lid from the rib via the hinge portion. To
An airbag cover for a vehicle, wherein a reinforcing layer formed separately is joined. 4. A cover body is formed by injecting a hard resin between the laminate sheet and the reinforcing layer to integrally join the core layer, and the inflation pressure of the airbag is applied to one of a pair of molds. Forming a cleaved portion forming piece corresponding to the position of the lid to be cleaved by forming the cleaved portion formed on the cover body by pressing the cleaved portion forming piece against the cover body. Method. 5. A hard resin is injected between the laminate sheet and the reinforcing layer, the core layer is integrally joined, the cover body is molded with a molding die, demolded, and then opened by the inflation pressure of the airbag. A cleaved part forming piece for forming a cleaved part corresponding to the position of the lid to be formed is provided separately from the molding die, and the cover body is pressed by the cleaved part forming piece to form the cleaved part freely and shallowly. A method for molding a vehicle airbag cover.