JPH1148888A - Interior parts for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an interior part which is provided with an effective energy absorbing function and can effectively cope with side collision. SOLUTION: As physical property for a resin core material 21, those with a bending elasticity coefficient of 13000 to 17000 kg/cm<2> and izod impact strength of 18 to 22 kg cm/cm<2> is used, and in an impact area 'A' which an abdomen of a passenger would hit at side collision, a notch-style thin wall part 21a is locally set. The thickness of this notch-style thin wall part 21a is set to M 1.0 to 1.7 mm against the thickness of a general part of 2.3 to 2.5 mm so as to give an effective impact absorbing function reducing a reaction force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile interior part such as an automobile door trim and a rear corner trim.
In particular, the present invention relates to an automobile interior part having an excellent shock absorbing function against an impact applied from the side of a vehicle.

[0002]

2. Description of the Related Art Normally, door trims for automobiles are mounted on the interior side of a door panel, and interior parts such as rear corner trims are mounted on a vehicle body panel on the side of a rear occupant of a two-door vehicle, thereby improving the interior aesthetics. And a cushioning function for protecting the occupant against a side impact applied to the vehicle.

FIGS. 9 and 10 are a perspective view and a sectional view, respectively, showing an automobile door trim provided inside a door inner panel. The automobile door trim 1 includes a door trim main body 2 formed into a desired curved surface shape. And a middle member 3 attached to a substantially central portion on the front side of the door trim main body 2.

[0004] The door trim body 2 is made of a resin core material 2 a having shape-retaining properties and rigidity for attachment to the vehicle body panel 4.
And a skin material 2b adhered to the surface of the resin core material 2a and having a cushioning property.
A material obtained by laminating an insulated portion pad 3b such as a polyurethane foam on the back surface of an insulated portion skin 3a such as a cloth having a different color and texture from the skin material 2b of the door trim body 2 is used. Groove groove 5
By press-fitting the peripheral end 3c of the intermediate member 3 into the inside,
The terminal treatment of the insulated member 3 is performed to configure the door trim 1 having excellent appearance performance. Recently, the door trim 1 has been mass-produced by using a mold press molding method having excellent molding accuracy as a molding method of the door trim body 2.

In the conventional door trim 1 for automobiles, a shock absorbing pad 6 such as a polypropylene foam or a hard urethane foam is bonded and fixed to a resin core material 2a of the door trim main body 2 at an appropriate position. Of the door trim body 2 against the relatively small external force of
b, or the impact load is reduced by the elastic action of the inscribed portion pad 3b of the inscribed member 3, and a relatively large impact from the side is absorbed by the impact absorbing pad 6. Like that.

However, the shock absorbing performance of the shock absorbing pad 6 tends to be difficult to obtain a constant shock absorbing function, for example, deterioration of the pad due to aging of the pad or the thickness of the pad is affected by the clearance with the vehicle body panel 4. Also, recently, the door trim 1 itself breaks in response to a large impact from the side, for example, because the work of bonding and fixing the shock absorbing pad 6 to the back surface of the door trim main body 2 is troublesome. There is a tendency for those having a configuration to alleviate this to be adopted in many cases.

That is, when an impact is applied from the side, the resin core material 2a in the impact area A indicated by a dotted line in FIG.
As shown in FIG. 7, a concave groove 7 is provided, and the fracture of the resin core material 2a is promoted with the concave groove 7 as a base point, so that an external impact is effectively absorbed.

The applicant has previously filed Japanese Patent Application No. 8-17882.
No. 54 has been filed.

In this method, as shown in FIGS. 13 and 14, the entire impact area A is set to be thin. The thickness of the thin portion 8 is 2.5 mm with respect to the thickness of the resin core 2a. The thickness is set to 2.0 mm.

[0010]

As described above, in the conventional automobile door trim 1, for example, in the configuration in which the concave groove 7 is formed, sink is likely to occur on the surface side of the concave groove 7, and the appearance is reduced. While significantly reducing the appearance,
There is a drawback that it is difficult to reduce the load of the entire impact area A, and it cannot be said to be an effective shock absorbing measure.

Further, in the configuration in which the entire impact area A is made thinner, the reaction force of the door trim 1 against the abdomen of the occupant is high, and is not so suitable for reducing the reaction force. Various drawbacks have been pointed out, for example, there is a problem in molding such as short shots or the like due to the narrow clearance between the molds.

The present invention has been made in view of such circumstances, and a skin material is adhered to the surface of a resin core material, and an impact from the side is applied to an interior component for an automobile to be installed on a side wall of a vehicle body. Easily induces breakage of the interior parts, effectively absorbs the impact from the side, does not cause sink marks on the product surface, and does not cause molding defects such as stickiness and short shots It aims to provide innovative automotive interior parts.

[0013]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to an automobile interior part in which a skin material is adhered to a surface of a resin core material formed into a required shape and which is interiorly mounted on a side wall of a vehicle body. The resin core material has a flexural modulus of elasticity of 13,000.
~17000kg / cm ^2, Izod impact strength 18
With is set to ~22kg · cm / cm ^2,
A notch-like thin portion is locally provided in the impact area from the rear end of the armrest to the end of the product, and the thickness of the notch-like thin portion is set to 2.3 to 2.5 mm for the general thickness of the resin core material.
Is set to 1.0 to 1.7 mm.

Here, as the resin core material, a thermoplastic resin such as a polypropylene resin mixed with a filler such as talc is used. In particular, in order to enhance the shock absorbing function, the flexural modulus is 13000 to 17000 kg / cm ^2. Particularly preferably, it is set to about 15000 kg / cm ² , and the Izod impact strength is set to about 18 to 22 kg · cm / cm ² , particularly preferably about 20 kg · cm / cm ² . The molding method of the resin core material may be appropriately selected from a mold press molding method, an injection molding method, a press molding method, and the like, and the skin material is a polyethylene foam or the like on the back surface of a synthetic resin sheet such as a PVC sheet. The laminated sheet material backing the cushion layer is preferably set in a mold at the time of mold press molding or injection molding, and a skin material may be integrally attached at the time of molding the resin core material.

Further, a notch-like thin portion is suitable as a local thin structure provided on the resin core material in order to enhance the shock absorbing function, and a product terminal from the rear end of the armrest where the abdomen of the occupant hits. It is provided in the impact area up to the vicinity, and the thickness of the notch-like thin portion is set to about 1.0 to 1.7 mm with respect to the thickness of the general part being 2.3 to 2.5 mm.

In consideration of the resin flow, if an intermediate thin portion is provided between the notch-like thin portion and the general portion, a short shot or the like during molding can be prevented as much as possible, and the thickness of the intermediate thin portion is reduced. It is preferably thinner than the general portion and thicker than the notch-like thin portion, for example, about 2.0 mm.

As is apparent from the above configuration, the resin core material in the impact area is provided with a thin portion locally, and this thin portion is a notch-like thin portion. There is no defect such as sink marks on the appearance, no molding failure such as short shot, and by specifying the bending elastic modulus and Izod impact strength of the resin core material, moderate rigidity is given, There is no feeling of stickiness,
In addition, there is no problem such as deformation. Further, an ideal shock absorbing function can be provided as shown in the attached graph.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a vehicle interior trim according to an embodiment of the present invention; 1 is a front view showing an automobile door trim, FIG. 2 is a cross-sectional view showing the configuration of the automobile door trim, FIGS. 3 and 4 are cross-sectional views of a main part showing the configuration of an impact area in the automobile door trim, and FIG. FIG. 6 is an explanatory view showing a side collision test procedure applied to an interior part, FIG. 6 is a graph showing a shock absorbing function of a car door trim according to the present invention, FIG. 7 is a graph showing a shock absorbing function of a conventional car door trim, FIG. FIG. 5 is a front view of an automobile door trim showing another embodiment of the present invention.

First, in FIGS. 1 to 4, an automobile door trim 10 includes a door trim main body 20 formed into a required shape by mold press molding, and an intermediate member 30 attached to a predetermined surface of the door trim main body 20. The door trim main body 20 is formed on the surface of a resin core material 21 having shape retention and rigidity for mounting to a vehicle body panel.
A skin material 22 having a decorative property and a cushion property is integrally attached.

More specifically, the resin core material 21 is made of a polypropylene resin mixed with talc, is formed into a required shape by mold press molding, and the skin material 22 is a polyethylene foam on the back surface of a top layer such as a PVC sheet. A laminated sheet having a good cushioning property backed by a foam layer such as that described above is used, and is integrally attached to the front surface side during the mold press molding of the resin core material 21.

On the other hand, the inscribed member 30 is the door trim main body 2.
The skin material 22 is preferably made of a material having a different feeling and feel. In the present embodiment, a material in which an insulated pad such as a polyurethane foam is lined on the back surface of the insulated portion such as a cloth is used. Numeral 30 denotes a wood grain groove 23 formed in the door trim main body 20 while being fixed by pressure bonding to a predetermined portion of the surface of the door trim main body 20 via an adhesive.
The inside edge of the insulated member 30 is subjected to a graining process, and the insulated member 30 is subjected to a terminal process. The door trim 10 is attached to the door inner panel 40 via a clip or the like (not shown). A shock absorbing pad 50 such as hard urethane is fixed to a predetermined portion of the back surface of the resin core 21.

The feature of the present invention is that when a relatively large impact is applied to the vehicle from the side, such as a side collision, the impact load is effectively absorbed to protect the occupant without fail. Even if the shock absorbing means is installed on the door trim 10, there is no sink mark on the surface of the product and molding defects such as deformation and short shots are prevented.

That is, the flexural modulus of the resin core material 21 is set to 13000 to 17000 kg / cm ² , preferably 15000 kg / cm ² , and the Izod impact strength is set to 18 to 22 kgcm / cm, preferably 20 kg · cm. / Cm ² , imparting appropriate rigidity to effectively prevent deformation, and in particular, in the impact area A shown by the dotted line in FIG. 1, gradually reduce the thickness so as not to cause sink marks on the product surface. Notch-like thin part 2
1a, the door trim 10 from the rear end side of the armrest 11
Is set locally to the vicinity of the trailing edge. At this time, the thickness of the notch-like thin portion 21a is adjusted to 1.0 to 1.7 mm with respect to the general thickness of the resin core 21 of 2.3 to 2.5 mm.

Next, as a comparative example of the present invention in which a notch-like thin portion 21a is locally formed in the impact area A,
As shown in FIGS. 13 and 14, side impact tests were performed on the impact area A having a structure in which the entirety of the impact area A was made thinner as shown in FIG. 5, and the present invention was compared with the graph of FIG. Shown in a graph.

In this side collision test, a rod 61 is connected to a load member 60 made of a semi-cylindrical body made of aluminum with the door trim 10 mounted on the door panel 40, and the peripheral surface of the load member 60 faces the door trim 10 side. And install it. This load element 60
Has a weight of 29 kg, the vertical dimension is set to 140 mm, the curvature of the peripheral surface is set to 90 mm, and is caused to collide against the armrest 11 of the door trim 10 at a speed of 35 km / h, and the displacement amount with respect to the load is shown in FIGS. Is shown in the graph. Here, the displacement of 90 mm or less is the displacement of the door trim 10, and the displacement exceeding 90 mm is the displacement of the door inner panel.

The load required to reach the peak of the displacement of the door trim at this time is desirably 2.9 kN or less. In the case of the present invention, as shown in the graph of FIG. Although the amount of displacement changes, in the comparative example shown in FIG. 7, the first peak at which the door trim is deformed is a load of 3.5 kN and the amount of displacement of the door trim is only 15 kN.
mm, as described above, in the comparative example, a large peak is observed at the initial stage of the side collision, which is not a desirable shock absorbing form.

As described above, according to the present invention, the notch-like thin portion 21a is locally formed in the impact area A extending from the rear end side of the armrest 11 to the rear end edge of the door trim 10. Excellent appearance and design can be ensured without sink marks compared to the grooves, and the impact load can be dispersed in the impact area A, preventing the conventional grooves from being concentrated. , FIG.
3, compared with the structure in which the entire impact area A shown in FIG. 14 is made thinner, an ideal shock absorbing form is obtained as shown in the graphs of FIGS. There are advantages that there is no molding failure and deformation can be effectively suppressed.

In the above embodiment, the door trim main body 20 is used.
In the embodiment in which the insulated member 30 is attached to the structure, in the structure in which the insulated member is attached and the end of the insulated member 30 is subjected to the graining process in the grained groove 23, the grained groove 23 has a reinforcing rib effect. The door trim 10 has a function of suppressing breakage of the door trim 10, but if the present invention is applied, the door trim 10 for a vehicle with high rigidity in which such a wood grain groove 23 is installed is provided.
In this case, a good shock absorbing function can be obtained.

The material and molding method of the door trim main body 20 are also the same as those of the resin core material 21 (flexural modulus,
And the Izod impact strength) are in the above-mentioned range, the thermoplastic resin material may be appropriately replaced, or the resin core material 21 may be formed by injection molding and press molding.

Next, FIG. 8 shows a second embodiment of the present invention, which is an improved example in consideration of moldability. That is, the notch-like thin portion 2 is formed locally in the impact area A.
The setting of 1a is the same as that of the above-described embodiment, but particularly, in consideration of the fluidity of the resin core material 21, the intermediate thin portion 21b is provided between the general portion of the resin core material 21 and the notch-like thin portion 21a.
Is set, and by changing the plate thickness in two stages, the fluidity of the resin is improved and deformation such as short shots is reliably suppressed. The thickness of the intermediate thin portion 21b is preferably about 2 mm.

Although the above-described embodiment is applied to the door trim 10 for an automobile, it can also be applied to a rear corner trim installed on the side of a rear occupant such as a two-door hardtop vehicle.

[0032]

As described above, the present invention has the following special functions and effects.

(1) According to the first aspect of the present invention, a notch-like thin portion is locally formed in the impact area of the interior part hitting the abdomen of the occupant during a side collision, and the resin core is bent. Since the elastic coefficient and Izod impact strength are set within a predetermined range, compared with the conventional ones that have an impact function by a concave groove, there is no sink mark on the product surface and the impact load is applied to the impact area. Can be dispersed and a good shock absorbing function can be obtained.

(2) According to the first aspect of the present invention, a notch-like thin portion is locally formed in the impact area of the interior part hitting the occupant's abdomen in the event of a side collision, and the resin core is bent. Since the elastic modulus and the Izod impact strength are set within a predetermined range, the reaction force can be reduced and a good shock absorbing function can be obtained, as compared with the case where a thin portion is provided over the entire impact area. In addition, there is no deformation defect such as short shots or a feeling of stickiness, the formability can be enhanced, and the desired rigidity can be obtained.

(3) According to the second aspect of the present invention, by setting an intermediate thin portion between a local notch-like thin portion in the impact area and a general resin core material, a change in sheet thickness can be reduced. By performing in two stages, the fluidity of the resin is improved, and molding defects such as short shots can be reliably prevented.
It has the effect of being excellent in moldability.

[Brief description of the drawings]

FIG. 1 is a front view of an automobile door trim showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a sectional view taken along line III-III in FIG. 1;

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

FIG. 5 is an explanatory view showing a point of a side collision experiment.

FIG. 6 shows a load in an automobile interior part according to the present invention.
7 is a graph showing a correlation between displacements.

FIG. 7 is a graph showing a load-displacement correlation in a comparative example.

FIG. 8 is a front view of an automobile door trim showing a second embodiment according to the present invention.

FIG. 9 is a perspective view showing a conventional automobile door trim.

FIG. 10 is a sectional view taken along line XX in FIG. 9;

FIG. 11 is a sectional view taken along line XI-XI in FIG. 9;

FIG. 12 is a perspective view of a conventional automobile door trim as viewed from the back side.

FIG. 13 is a perspective view of an automobile door trim showing an example of the prior application.

FIG. 14 is a sectional view taken along line XIV-XIV in FIG. 13;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Automobile door trim 11 Armrest 20 Door trim main body 21 Resin core material 21a Notch-like thin part 21b Intermediate thin part 22 Skin material 23 Groove part 30 Middle contact member 40 Door inner panel 50 Shock absorption pad 60 Load element 61 Rod A Impact area

Claims (2)

[Claims] 1. A resin core material (21) formed into a required shape.
In an automobile interior part in which a skin material (22) is adhered to a surface and interior is provided on a vehicle body side wall, the resin core material (21) has a flexural modulus of 13,000 to 13,000.
7000 kg / cm ² , Izod impact strength is 18-2
A notch-like thin portion (21a) is locally provided in the impact area (A) from the rear end of the armrest (11) to the rear end of the product while being set to ² kg · cm / cm ^2. The thickness of (21a) is set to be 1 to the general thickness of 2.3 to 2.5 mm of the resin core material (21).
An interior part for an automobile characterized by being set to 0 to 1.7 mm. 2. An intermediate thin portion around the notch-like thin portion (21a) of the resin core material (21), which is thinner than the plate thickness of the general portion and thicker than the plate thickness of the notch-like thin portion (21a). 2
The automotive interior part according to claim 1, wherein 1b) is set.