JPH11301398A - Vehicular trimming member having air bag door part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce fracturing force of a tear part of an air bag door part to a desired value or less without deteriorating the quality of appearance even if the air bag door part of a vehicular trimming member and a main body part are formed on the same resin. SOLUTION: Thick parts 26 projecting on the back surface 20A side of an air bag door part 20 are respectively formed on both sides of a thin part 24, and the thickness of each thick part 26 is larger than the plate thickness of a general part of the air bag door part 20. Therefore, resin can easily flow to a cavity for forming the thick part in injection molding, and the resin flow toward the tip 24A of the thin part 24 for forming a tear line is generated by the resin flowing into respective cavities. As a result, since the resin flow reliably reaches the tip 24A of the thin part 24, a resin joint part can be reliably formed on the tip 24A of the thin part 24 to be taken as the tear line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle interior member having an airbag door portion in which a door portion of an airbag device is provided on a vehicle interior member such as an instrument panel.

[0002]

2. Description of the Related Art Conventionally, vehicle interior members such as an instrument panel having an airbag door portion, a door trim, a center pillar garnish, and a handle pad are known, and one example thereof is disclosed in JP-A-8-192666. ing.

In the method of molding an instrument panel having an airbag door, the body of the instrument panel having an opening for the airbag door is injection-molded with a thermoplastic resin, and then the airbag door is molded with a thermoplastic resin. The body of the instrument panel and the airbag door are integrally formed by so-called two-color molding (double injection molding) of injection molding with an elastomer.

[0004]

However, in a vehicle interior member having such an airbag door portion, the entire vehicle interior member is made of the same resin without changing the resin of the airbag door portion to the resin of the main body portion. When the airbag door is configured with the same thickness, the tearing force of the tear portion (ruptured portion) formed in the airbag door during deployment is high (with the same thickness) due to the characteristics of the resin of the main body. It becomes difficult to do. Further, if the resin thickness of the tier portion is excessively reduced to improve this, the thin-walled portion is further visible from the design surface side, and the appearance quality is reduced.

In order to make the tear line completely invisible (invisible type) from the design surface side, there is a method in which the thickness is increased at the time of molding and cut by post-processing. However, in this method, it is extremely difficult to make the tear line invisible while maintaining a predetermined breaking force. That is, when the resin thickness is reduced, even if a relief groove is formed, the tear line and the undulation can be seen from the design side, and the practical appearance quality cannot be maintained, and the resin thickness can be sufficiently reduced. Can not.

[0006] The tear force of the tier portion formed in the airbag door portion during deployment increases, making it difficult for the airbag door portion to deploy. In order to improve this, the resin thickness of the tier portion is reduced. If it is too long, the thin part can be seen from the design surface side, so that the appearance quality is deteriorated because the airbag door part and the body part of the vehicle interior member are separately molded and then integrated with the locking claw or screw etc. It also occurs in the tier portion of the vehicle interior member.

In view of the above facts, the present invention does not degrade the appearance quality even if the airbag door portion and the main body portion of the vehicle interior member are formed of the same resin, and the tear of the airbag door portion. It is an object of the present invention to provide a vehicle interior member having an airbag door part capable of reducing the breaking force of the part to a desired value, and a method of molding the same.

[0008]

According to the present invention, there is provided an interior member for a vehicle having an airbag door integrally or separately molded by injection molding using the same hard resin material as a main body. A tier portion thinner than a general thickness is formed on the airbag door portion, and a thick portion thicker than the general thickness is formed on at least a part of the tier line on both sides or one side of the tier portion. I do.

Therefore, since the tier is made thinner and the periphery of the tier is made thicker, the resin easily flows into the thicker part at the time of injection molding, and the resin flows from these thicker parts toward the tier. As a result, a resin merging portion (weld) can be reliably formed at the tear line, and the breaking force of the tear portion can be reduced to a desired value even when the door portion and the main body portion are molded with the same hard resin. Can be. Further, since both the main body and the airbag door can be made of a hard resin having high rigidity, stickiness and deformation can be prevented. Further, since the thick portion is formed along the tear line of the airbag door portion, the surface rigidity of the airbag door portion can be improved.

According to a second aspect of the present invention, in the vehicle interior member having the airbag door portion according to the first aspect, at least a surface of the airbag door portion is provided with a skin via a foam layer. It is characterized by being.

Therefore, in addition to the contents described in claim 1, even if the thickness of the tier portion of the airbag door base material is increased, the airbag door base material of the integral foam type or the skin insert or the skin pasting type is provided. And the epidermis breaks smoothly. In addition, since the skin is set on the surface of the airbag door portion via the foam layer, even if the thick portion has a sink mark, or if the thick portion of the base material protrudes on the skin side, the foam is formed. By interposing the layer, unevenness of the base material can be prevented from appearing on the design surface. Therefore, it is possible to achieve both improvement of the deployment performance and improvement of the appearance quality.

According to a third aspect of the present invention, in the vehicle interior member having the airbag door portion according to the second aspect, the tier portion has a V-shaped cross section and is set only from the surface side of the thick portion. It is characterized by being.

Therefore, in the normal state, even if a load or an impact is applied from the design surface side of the instrument panel, the opposed slopes of the V-shaped tier portion come into contact with each other only by slightly bending.
As a result, it is possible to prevent the tear portion from being easily broken.
For this reason, it is possible to prevent the appearance from being inferior while being strong against the load and impact from the design surface while satisfying the deployment performance.

According to a fourth aspect of the present invention, in the vehicle interior member having the airbag door portion according to the second aspect, the tier portion is set near a center of a plate thickness of the thick portion. Features.

Therefore, the resin is hard to cool at the central portion of the thick resin plate in the thickness direction, and the resin temperature is higher than the other portions, so that the resin easily flows into this portion. As a result, by setting the tier portion in this portion, it is possible to prevent underfilling in the tier portion, so that in a plate thickness capable of securing a predetermined tear portion breaking force,
Underfill failure at the tier can be prevented.

According to a fifth aspect of the present invention, there is provided an interior member for a vehicle having an airbag door part integrally or separately molded by injection molding using the same hard resin material as the main body part. A lateral tear line,
While forming a tier portion thinner than the general thickness consisting of the vertical tier line connected to both ends of the horizontal tier line, the thick portion thicker than the general thickness is formed only on both sides or one side of the vertical tier portion. It is formed along a vertical tear line, and a resin flow boundary by a core back is set in the horizontal tear line.

Therefore, in normal injection molding, the pressure in the mold does not increase until the resin joins, and it is difficult to fill the thin tier portion. In the lateral tier portion, the resin merges from the front-back direction and the mold internal pressure increases, but by then the resin in the vertical tier line cools and stops flowing. In this regard, in the present invention, only the periphery of the vertical tier portion is thickened, so that the resin easily flows into the thick portion during injection molding, and the resin flow from the resin once accumulated in the thick portion toward the vertical tier line is reduced. Occurs. As a result, a resin flow boundary can be reliably formed in the vertical tier portion. In addition, after the resin merges from the left and right directions in the vertical tier portion and the mold internal pressure increases, the horizontal tier portion can be formed by the core back, so that the breaking force of the horizontal tier portion can be easily managed. is there.

According to a sixth aspect of the present invention, there is provided an interior member for a vehicle having the airbag door portion according to any one of the first to fifth aspects, wherein both sides of a center portion of the tier portion in the thick portion are sandwiched. Alternatively, a protrusion protruding inward is integrally formed on one side portion.

Therefore, in addition to the contents described in any one of the first to fifth aspects, when the airbag bag is deployed, the impact load due to the airbag bag is transmitted through the protrusion protruding inward. Focus on the line. As a result, in combination with the formation of the resin merging portion on the tear line, the airbag door portion is smoothly broken from the tear line. Therefore, it is possible to further achieve both deployment performance and appearance quality. Further, since the airbag door section is broken first from the tear line, the load on the door hinge section can be reduced. Further, the above effect can be achieved with a simple configuration in which a projection is provided only in a part of the thick portion.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a vehicle interior member having an airbag door unit according to the present invention will be described with reference to FIGS.

In the drawings, the arrow FR indicates the forward direction of the vehicle, and the arrow UP indicates the upward direction of the vehicle.

As shown in FIG. 4, an instrument panel 10 as an interior member for a vehicle provided in the interior of the vehicle has an airbag device (in the passenger seat side (left side in FIG. 4)). 1 is shown in FIG. 1).

As shown in FIG. 1, the airbag device 12
The airbag case 14 is fixed to an instrument panel / reinforcement (not shown), and the airbag case 14 accommodates an inflator 16 and an airbag body 18 in a folded state.

The portion of the instrument panel 10 substantially facing the airbag case 14 is an airbag door portion 20, and the portion of the instrument panel 10 other than the airbag door portion 20 is a main body portion 22. I have.

The airbag door section 20 and the main body section 2
The base material 23 is made of TSOP [elastomer (rubber) and PP (polypropylene) as hard resin and made into a broy (technology for producing a polymer multi-component material that can be expected to have a synergistic effect).
And reinforced with talc, which has impact resistance and rigidity, and has good fluidity and low specific gravity PP resin suitable for thin products, for example, a flexural modulus of 1500 to 3000MP.
a], PP resin, PC / ABS resin, modified PPO resin, PC / PBT resin, ABS resin, PC resin, ASG resin, TPO resin, TPE resin, TP
It is composed of a U-based resin, a PC / modified PS-based resin, a PC / AES-based resin, a PC / ASA-based resin, and the like.

The front door section 20A of the airbag door section 20
Hinge portions 25 are formed at a front end portion of the rear door portion 20B and a rear end portion of the rear door portion 20B, respectively.
, A concave portion is formed on the back surface side of the base material 23 over a predetermined front and rear width.

When the airbag device 12 detects a sudden deceleration of the vehicle by a mechanical or electrical acceleration sensor (not shown) or the like, the inflator 16 in the airbag case 14
Operates to inflate the airbag body 18 folded and housed in the airbag case 14 toward the airbag door portion 20 of the instrument panel 10.
The airbag body 18 presses the airbag door portion 20 of the instrument panel 10 to press the airbag door portion 20.
To be unfolded and deployed in the cabin. In addition,
As the airbag device 12, a conventionally known general configuration can be applied.
The detailed description of is omitted.

As shown in FIG. 3, the airbag door 2
A thin portion 24 as a tear portion is formed in an H shape in a plan view at substantially the center in the front-rear direction and both ends in the left-right direction. The thin portion 24 includes a horizontal thin portion 24A forming a horizontal tear line and a vertical thin portion 24B forming a vertical tear line formed at both ends of the horizontal tear line.
When the airbag body is deployed, the airbag door section 20 opens and closes (both open) back and forth, and the airbag body is deployed in the vehicle interior.

As shown in FIG. 2, the cross section of the thin portion 24 has a V-shape opened to the back surface 23A side of the base material 23.
Thick portions 26 protruding toward the A side are respectively formed.
The thickness T1 of these thick portions 26 is determined by the airbag door 2
0 (T1>)
T). In addition, the front door portion 20 of the airbag door portion 20 is provided at the tip (bottom) 24A of the thin portion 24 serving as a tear line.
A resin flow boundary 28 between the resin forming A and the resin forming the rear door portion 20B is set.

Accordingly, when the airbag door 20 is pressed by the inflating airbag 18 during deployment of the airbag, the airbag door 20 is torn along the tip 24A of the thin portion 24, and the torn front door 20A is opened. And the rear door portion 20B rotate about the hinge portion 25, and the airbag 1
An opening is formed to allow the opening 8 to be deployed in the vehicle interior.

In FIG. 1, the resin flow boundary 28
The hatching direction of the front door portion 20A and the hatching direction of the rear door portion 20B are changed in order to clarify.

Next, a method of forming an instrument panel according to an embodiment of the present invention will be described in detail.

As shown in FIG. 5, first, a predetermined gate G is provided in a cavity 44 formed between an upper die 40 and a lower die 42 as a molding die of an instrument panel.
The resin is injected from A or the gate GB (see FIG. 4) to form the front door portion 20A of the airbag door portion 20, and the resin is injected from the gate GA or the gate GB to form the rear door portion 20B. At this time, the convex portion 4 of the lower mold 42 having a substantially triangular cross section for forming a thin portion.
6 has a slight initial gap S with the upper mold 40.
Are opened to be close to each other, and substantially divide the cavity 44.

In the lower mold 42, on both sides of the convex portion 46,
Recesses 48 each having a trapezoidal cross section for forming a thick portion are formed.
Cavities 44A and 44B having a large vertical width are formed.

As a result, the resin of the front door portion 20A injected and flown by the gate is filled in the cavity 44A having a large vertical width formed by the concave portion 48 before reaching the tip 46A of the convex portion 46. On the other hand, the resin of the rear door portion 20 </ b> B injected and flown by the gate becomes the tip 46 of the convex portion 46.
Before reaching the position A, the cavity 44B having a wide upper and lower width formed by the concave portion 48 is filled.

For this reason, at the time of injection molding, first, the resin easily flows into the cavities 44A and 44B for forming the thick portions, and the resin flowing into each of the cavities 44A and 44B causes the tip of the convex portion 46 which forms the tear line. A resin flow toward 46A (arrow S in FIG. 5) occurs. As a result, the resin flow reliably reaches the tip 46A of the projection 46,
The resin merging portion can be reliably formed at the distal end 24A of the thin portion 24 serving as a tear line.

Further, since the thick portion 26 is provided on the upstream side of the thin portion 24 serving as the tier line in the resin flow direction, it is possible to greatly reduce the resin merging deviation on the tier line.
That is, when the resin is to be merged at a point on the tear line earlier than a peripheral part on the tear line, the cavities 44A and 4A for forming the thick portion 26 are formed.
4B, the resin is in these cavities 44A,
4B, the resin flow does not proceed to the confluence point, and the resin flow in the peripheral portion on the tier line catches up during that time, so that the resin merging deviation on the tier line can be greatly reduced.

Therefore, since the tear line coincides with the resin merging portion, even if the airbag door portion 20 and the main body portion 22 of the instrument panel 10 are formed of the same hard resin, the breaking force of the thin portion is reduced. It can be reduced to a desired value. Further, since the airbag door section 20 and the main body section 22 of the instrument panel 10 can be made of a hard resin having high rigidity, stickiness and deformation can be prevented. Furthermore, since the thick portion 26 is formed along the tear line of the instrument panel 10, the surface rigidity of the door portion can be improved.

In the present embodiment, since the thick portion 26 protrudes toward the back surface 23A of the base member 23 (the back surface of the airbag door portion), the airbag bag 18 is used when the airbag bag is deployed. The impact load is concentrated on the tear line via the thick part 26, and the air bag door part is smoothly broken from the tear line, in combination with the formation of the resin merging portion at the tear line. As a result, it is possible to further improve the deployment performance and the appearance quality, and to smoothly break the thin portion 24, so that the door hinge 25
Load on the vehicle can be reduced. Further, the above effect can be achieved with a simple configuration in which the thick portion 26 is protruded toward the back surface 23A of the base material 23.

As shown in FIG. 6, a vehicle interior member having an airbag door according to the present invention comprises a base material 23,
It is also applicable to an instrument panel 10 as a vehicle interior member of a so-called skin insert or skin pasting type having a skin 50 covering a surface (design surface) 23B of the base material 23. A tear portion 52 is also formed on the skin 50 so as to oppose the thin portion 24 of the material 23, so that the skin 50 is easily broken when the airbag body is deployed. Alternatively, even if the tear portion 52 is not provided, the airbag door portion is made of a material having high rigidity, and is locally pulled at the same time as the airbag door portion is deployed. Therefore, the skin 50 is easily broken. In the case of a skin insert, the skin 50 shown here is the same as the single-layer skin 50 shown in FIG.
And a three-layer skin 50 shown in FIG. 7C may be used. In FIG. 7B, reference numeral 54 denotes a foam layer, and in FIG. 7C, reference numeral 54 denotes a foam layer, and reference numeral 56 denotes a barrier layer.

FIG. 8A shows the case of the pasting type.
8B, a skin 50 with a foam layer 54 shown in FIG. 8B may be used.

Further, as shown in FIG. 9, when a foam layer 58 is interposed between the base material 23 and the skin 50, the irregularities on the design surface can be repaired. As a result, as shown in FIG.
It may be configured to protrude to the B side. Further, as shown in FIG. 11, the thick portion 26 may be configured to protrude only on the surface 23B side of the base material 23.

Next, a second embodiment of a vehicle interior member having an airbag door portion according to the present invention will be described with reference to FIG.

The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 12, in this embodiment,
On both sides of the vertical thin portion 24B forming the vertical tear line, the thick portions 26 protruding toward the back surface 23A side of the base material 23 are respectively formed, but the horizontal thin portion 24A forming the horizontal tear line is formed. Does not have a thick portion. For this reason, in the laterally thin portion 24A, the resin flow boundary is set by the core back of the mold.

That is, as shown in FIG. 13, an upper mold 40 serving as a design side of the instrument panel and a cavity 44 between the upper mold 40 and the lower mold 42 are provided with a predetermined different gate GA or gate GB. (See FIG. 4), resin is injected from the front door 20 of the airbag door 20.
A is formed, and a resin is injected from the gate GA or the gate GB to form the rear door portion 20B. At this time, the tip 43A of the slide core 43 having a substantially triangular cross section is used.
Is a small initial gap S (0 <S ≦ 2 m
m) is open and close to substantially separate the cavity 44.

The slide core 43 is disposed in the lower mold 42 so as to be movable in the direction of contacting and separating from the upper mold 40 (the directions of arrows A and B in FIG. 13).

Further, the slide core 4 is instantaneously provided at a predetermined point between the time when the resin of the front door portion 20A reaches the front end 43A of the slide core 43 and the pressure holding completion time.
A predetermined amount L (a range not exceeding the general thickness of the airbag door portion, for example, in a direction away from the position close to the upper mold 40 (the position indicated by the two-dot chain line in FIG. 14) (the direction of the arrow B in FIG. 14), for example, 0 <L ≦ 5 mm. If the general thickness of the door portion is large, L may be further increased.)
Move (core back) to the lowered position (the position indicated by the solid line in FIG. 14).

For this reason, a space 51 corresponding to the moving volume of the slide core 43 is generated, and the resin of the front door portion 20A fills the front space 51A of the space 51 and the rear door portion until the pressure holding completion time. The rear space 50B of the space 50 is filled with the resin of 20B, and at this portion, the tip (bottom) 24A of the thin portion 24 and the resin flow boundary 28 coincide, and the state shown in FIG. 14 is obtained. In FIG. 14, the front space 51A and the rear space 51B filled with resin are indicated by different hatchings for easy understanding.

Therefore, in normal injection molding, the mold inner pressure does not increase until the resin joins, and it is difficult to fill the thin tier portion. In the lateral tier portion, the resin merges from the front and rear directions to increase the mold inner pressure, but by then the resin in the vertical tier line may cool and stop flowing. In this regard, in the present embodiment, the thick portion 2 similar to the first embodiment (see FIGS. 2 and 5) is provided only on both sides of the vertical thin portion 24B.
6, the resin easily flows into the cavities 44A, 44B for forming the thick portion 26 during the injection molding, and the resin flowing into each of the cavities 44A, 44B forms the ridge 46 that forms the tear line. Tip 46A
Resin flows toward. As a result, the resin flow surely reaches the tip end 46A of the convex portion 46, so that the resin merging portion can be reliably formed at the tip end 24A of the thin portion 24 serving as a tear line.

Further, in the present embodiment, the resin flow boundary 28 is set in the core back region for forming a break when the airbag door is deployed.
By the decrease in strength due to 8, the breaking force of the breaking portion can be reduced to a desired value. In addition, since it is not necessary to make the resin thickness of the broken portion extremely thin, it is possible to prevent the deterioration of the appearance quality, to improve the heat aging resistance, and to improve the support and surface rigidity of the entire airbag door portion.

Next, a third embodiment of a vehicle interior member having an airbag door portion according to the present invention will be described with reference to FIG.

The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG. 15, in this embodiment,
The cross section of the thin portion 24 has a V-shape opening toward the surface 23B of the base member 23, and the opening angle θ of the V-shape is set to a predetermined narrow angle.

Therefore, in this embodiment, the design surface side of the instrument panel 10 (upper side in FIG. 15) in the normal state.
When a load or impact is applied, as shown by a two-dot chain line in FIG. 15, when the base material 23 slightly bends downward, the opposed slopes 24B of the thin portion 24 are in a state in which the foamed layer 58 is interposed. Is brought into contact. As a result, the resin flow boundary 28
Since it is not easily broken, it can withstand the load and impact from the design surface side while satisfying the developing performance, and can prevent the appearance defect.

As shown in FIG. 16A, the cross-sectional shape of the thick portion 26 is different from the surface (design surface) 23B of the base material 23.
It may be configured to protrude only on the side. FIG.
As shown in (B), the cross-sectional shape of the thick portion 26 may be configured to protrude only on the back surface 23A side of the base material 23.

Next, a fourth embodiment of a vehicle interior member having an airbag door portion according to the present invention will be described with reference to FIG.

The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 17, in this embodiment,
The foam layer 58 is interposed between the base material 23 and the skin 50, and the thin portion 24 is formed from the V-shaped groove 60 formed from the front surface 23B side of the base material 23 and the back surface 23A of the base material 23. And a V-shaped groove 62 in section. On both sides of the thin portion 24, the front surface 23B side and the back surface 23
Thick portions 64 protruding toward the A side are respectively formed.
The thickness T1 of these thick portions 64 is larger than the plate thickness T of the general portion of the base material 24 (T1> T).

In ordinary injection molding, the resin is hard to cool at the central portion of the thick resin in the plate thickness, and the resin temperature is higher than other portions, so that the resin easily flows into this portion. For this reason, in the present embodiment, the central portions 64 in the thickness direction of the thick portions 64 on both sides are provided.
By setting the leading end (bottom) 24A of the thin portion 24 to A, it is possible to prevent underfill in the tier portion. As a result, it is possible to prevent underfill failure at the tier portion at a plate thickness at which a predetermined tear portion breaking force can be secured.

In the present embodiment, the thick portion 64 is projected on both the front surface 23B and the back surface 23A with respect to the general portion of the base member 23. ), The thick portion 64 may be configured to protrude only to the surface 23B side of the base material 24. FIG.
As shown in (B), the thick portion 64 may be configured to protrude only to the back surface 23A side of the base material 24.

In this embodiment, the base material 23 and the skin 5
0, a foam layer 58 is interposed between the base material 23 and the surface 23B of the base material 23, as shown in FIG.
It is also possible to adopt a configuration in which three layers of the skin 50 are provided. In addition,
In FIG. 19, reference numeral 66 indicates a foam layer, and reference numeral 68 indicates a barrier layer.

In the above, the present invention has been described in detail with respect to a specific embodiment. However, the present invention is not limited to such an embodiment, and various other embodiments are included within the scope of the present invention. It is clear to a person skilled in the art that is possible. For example, in each of the above embodiments, the thick portion 26 is formed on both sides of the thin portion 24. However, a configuration in which the thick portion 26 is formed only on one side of the thin portion 24 may be adopted.

In each of the above embodiments, for example,
As shown by a two-dot chain line in FIGS. 2 and 11, both sides or one side (the both sides in FIGS. 2 and 11) sandwiching the center of the tier portion in the thick portion 26 are provided inward (the base material 23).
The projection 70 protruding toward the rear surface 23A (the side of the rear surface 23A) may be integrally formed. In this case, since the protrusion 70 protrudes inward, when the airbag bag is deployed, the impact load due to the airbag bag 18 is concentrated on the tear line via the protrusion 70, and the resin confluence portion is connected to the tear line. Combined with the formation, the airbag door portion breaks smoothly from the tear line. As a result, it is possible to further achieve both improvement in deployment performance and improvement in appearance quality, and to reduce the load on the door hinge 25 because the thin portion 24 is smoothly broken. Also, with a simple configuration in which the projection 70 is protruded inward from the thick portion 26 by integral molding,
The above effects can be achieved.

In each of the above embodiments, the thin portion 2
The cross-sectional shape of 4 may be an R shape, a stepped shape, or the like in addition to the V shape. Further, the resin of the front door portion 20A is made of the gate G.
The filling is performed not only from A but also from the gate GB, so that only one gate may be used.

The instrument panel having the airbag door portion and the method of forming the same according to the present invention are a double-open (double-open) type air in which the thin portion 24 as shown in FIG. The present invention is not limited to the bag door portion, and is also applicable to a vehicle interior member in which the thin portion 24 is formed in a U-shape in plan view as shown in FIGS.

Further, the interior member for a vehicle having the airbag door portion of the present invention is formed by injection molding the main body portion of the instrument panel and the airbag door portion which are separated from each other using resin, and then engaging the claw or the like. The present invention is also applicable to vehicle interior members such as an instrument panel having an airbag door unit integrated with screws or the like.

The vehicle interior member having the airbag door portion of the present invention can be applied to a door trim, a center pillar garnish, a handle pad and the like in addition to the instrument panel.

[0069]

According to the first aspect of the present invention, there is provided an interior member for a vehicle having an airbag door portion integrally or separately molded by injection molding using the same hard resin material as the main body portion. In addition to forming a tier portion thinner than the general thickness, a thick portion thicker than the general thickness is formed along at least a part of the tier line on both sides or one side of the tier portion. Even when the main body and the main body are formed of the same resin, there is an excellent effect that the tearing force of the tier of the airbag door can be reduced to a desired value without deteriorating the appearance quality.

According to a second aspect of the present invention, in the vehicle interior member having the airbag door portion according to the first aspect, at least a surface of the airbag door portion is provided with a skin via a foam layer. Therefore, in addition to the effects described in the first aspect, there is an excellent effect that both improvement in deployment performance and improvement in appearance quality can be achieved.

According to a third aspect of the present invention, in the vehicle interior member having the airbag door portion according to the second aspect, the tier portion is V-shaped in cross section and is set only from the surface side of the thick portion. In addition to the effects described in claim 2, there is an excellent effect that it is strong against a load or an impact from the design surface side while satisfying the developing performance, so that a defect in appearance can be prevented.

According to a fourth aspect of the present invention, in the vehicle interior member having the airbag door portion according to the second aspect, the tier portion is set near the center of the thickness of the thick portion. In addition to the effect described in the item 2, there is an excellent effect that the underfill defect at the tier portion can be prevented at a plate thickness capable of securing a predetermined tear portion breaking force.

According to a fifth aspect of the present invention, there is provided an interior member for a vehicle having an airbag door unit integrally or separately molded by injection molding using the same hard resin material as the main body unit. While forming a tier portion thinner than the general thickness consisting of the direction tear line and the vertical tear line connected to both ends of the horizontal tear line,
A thick portion thicker than the general thickness is formed along the vertical tear line only on both sides or one side of the vertical tear portion, and the resin flow boundary by the core back is set in the horizontal tear line. Even when the airbag door portion and the main body portion are molded of the same resin, it is possible to reduce the appearance quality and to reduce the breaking force of the tier portion of the airbag door portion to a desired value. Has an effect. Further, there is an excellent effect that the resin flow boundary can be reliably formed in the vertical tier portion, and the breaking force of the horizontal tier portion can be easily managed.

According to a sixth aspect of the present invention, there is provided an interior member for a vehicle having the airbag door portion according to any one of the first to fifth aspects, wherein both sides sandwiching a central portion of the tier portion in the thick portion are provided. Since the protrusion protruding inward is integrally formed on one side, in addition to the effect according to any one of claims 1 to 5, it is possible to further achieve compatibility between deployment performance and appearance quality. In addition to this, there is an excellent effect that the load on the door hinge can be reduced. Also,
It has an excellent effect that the above effects can be achieved with a simple configuration.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view taken along line 1-1 of FIG.

FIG. 2 is a partially enlarged sectional view of FIG.

FIG. 3 is a plan view showing a back surface of the vehicle interior member having the airbag door portion according to the first embodiment of the present invention.

FIG. 4 is a perspective view showing an instrument panel as an interior member for a vehicle having an airbag door portion according to the first embodiment of the present invention, as viewed obliquely from the rear of the vehicle.

FIG. 5 is a cross-sectional view corresponding to FIG. 2, showing one step in a method of forming a vehicle interior member having an airbag door according to the first embodiment of the present invention.

FIG. 6 is a cross-sectional view corresponding to FIG. 1 of a vehicle interior member having an airbag door according to a modification of the first embodiment of the present invention.

FIGS. 7A to 7C are cross-sectional views illustrating a skin of a skin insert of a vehicle interior member having an airbag door according to the first embodiment of the present invention.

FIGS. 8 (A) and (B) are cross-sectional views showing a pasting type skin of a vehicle interior member having an airbag door portion according to the first embodiment of the present invention.

FIG. 9 is a cross-sectional view corresponding to FIG. 1 of a vehicle interior member having an airbag door according to another modification of the first embodiment of the present invention.

FIG. 10 is a sectional view corresponding to FIG. 2 of a vehicle interior member having an airbag door according to another modification of the first embodiment of the present invention.

FIG. 11 is a cross-sectional view corresponding to FIG. 2 of a vehicle interior member having an airbag door according to another modification of the first embodiment of the present invention.

FIG. 12 is a plan view showing a back surface of a vehicle interior member having an airbag door according to a second embodiment of the present invention.

FIG. 13 is a schematic cross-sectional view showing one step in a method of forming an interior member for a vehicle having an airbag door according to a second embodiment of the present invention.

FIG. 14 is a schematic cross-sectional view showing one step in a method of forming an interior member for a vehicle having an airbag door according to a second embodiment of the present invention.

FIG. 15 is a sectional view corresponding to FIG. 2 of a vehicle interior member having an airbag door portion according to a third embodiment of the present invention.

16A is a cross-sectional view corresponding to FIG. 2 of an interior member for a vehicle having an airbag door according to a modification of the third embodiment of the present invention, and FIG. 16B is a cross-sectional view of FIG. It is sectional drawing corresponding to FIG. 2 in the vehicle interior member which has the airbag door part which concerns on the other modification of embodiment.

FIG. 17 is a sectional view corresponding to FIG. 2 of a vehicle interior member having an airbag door portion according to a fourth embodiment of the present invention.

18A is a cross-sectional view corresponding to FIG. 2 of an interior member for a vehicle having an airbag door according to a modification of the fourth embodiment of the present invention, and FIG. 18B is a cross-sectional view of FIG. It is sectional drawing corresponding to FIG. 2 in the vehicle interior member which has the airbag door part which concerns on the modification of embodiment.

FIG. 19 is a cross-sectional view corresponding to FIG. 2 of a vehicle interior member having an airbag door according to another modification of the fourth embodiment of the present invention.

FIG. 20 is a plan view showing a back surface of a vehicle interior member having an airbag door according to another embodiment of the present invention.

FIG. 21 is a plan view showing a rear surface of a vehicle interior member having an airbag door according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Instrument panel (vehicle interior member) 12 Airbag device 20 Airbag door part of instrument panel 22 Body part of instrument panel 23 Base material 24 Thin part (tier part) 26 Thick part 28 Resin flow boundary 40 Above Mold 42 Lower mold 46 Lower mold convex part 48 Lower mold concave part 50 Skin 58 Foam layer 60 V-shaped cross section 62 V-shaped cross section 64 Thick part 70 Projection

Claims (6)

[Claims] 1. An interior member for a vehicle having an airbag door unit integrally or separately molded by injection molding with the same hard resin material as a main body unit, wherein the airbag door unit has a tier portion thinner than a general thickness. A vehicle interior member having an airbag door portion, characterized in that a thick portion thicker than a general thickness is formed on both sides or one side of the tier portion along at least a part of the tier line. 2. A vehicle interior member having an airbag door according to claim 1, wherein a skin is provided at least on a surface of the airbag door via a foam layer. 3. The interior member for a vehicle having an airbag door according to claim 2, wherein the tear portion has a V-shaped cross section and is set only from the surface side of the thick portion. 4. The tier portion is set near the center of the thickness of the thick portion.
A vehicle interior member having the airbag door portion according to claim 1. 5. An interior member for a vehicle having an airbag door unit integrally or separately molded by injection molding of the same hard resin material as a main body unit, wherein a lateral tear line is provided on the airbag door unit. While forming a tier part thinner than the general thickness consisting of the vertical tear line connected to both ends of the horizontal tear line,
A thick portion thicker than the general thickness is formed along the vertical tear line only on both sides or one side of the vertical tear portion,
A vehicle interior member having an airbag door portion, wherein a resin flow boundary by a core back is set in the lateral tear line. 6. A projection protruding inward is integrally formed on both sides or one side of the thick portion with the center portion of the tear portion therebetween.
A vehicle interior member having the airbag door portion according to any one of the above.