JP3575787B2 - Car door trim - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an automotive door trim, and more particularly to an automotive door trim comprising an upper and lower divided body of a door trim upper made of a resin core material and a skin material, and a door trim lower made of a synthetic resin injection molded body.
[0002]
[Prior art]
Normally, various interior parts are provided in a vehicle interior. FIG. 5 is a front view showing a vehicle door trim provided in a door panel, and FIG. 6 is a sectional view showing a configuration of the vehicle door trim. In order to improve the door trim, the upper and lower two-part body of the door trim upper 2 and the door trim lower 3 is often adopted as the door trim 1 for automobiles.
[0003]
As shown in FIG. 6, the door trim upper 2 and the door trim lower 3 are configured such that a skin material 2 b is attached to a surface of a resin core material 2 a formed into a desired curved shape, and a door trim lower 3 is formed. Is composed of an injection molded body of a synthetic resin such as a PP resin.
[0004]
6 and 7, the upper edge of the door trim lower 3 is wrapped on the front side along the lower edge of the door trim upper 2 as shown in FIG. 6 and FIG. Then, ultrasonic bosses 4 are formed at predetermined intervals on the back side of the door trim lower 3 at the lap portion, and the ultrasonic bosses 4 are inserted into mounting holes 5 formed in the door trim upper 2. After that, the front end portion of the ultrasonic boss 4 is caulked by ultrasonic welding to join and fix the door trim upper 2 and the door trim lower 3.
[0005]
[Problems to be solved by the invention]
As described above, in the conventional automobile door trim 1 having the upper and lower two-parting structure, the door trim upper 2 and the door trim lower 3 are joined and fixed at a plurality of ultrasonic processing points. The welding process is performed while applying an appropriate press pressure with a sonic horn. For example, when the skin material 2b of the door trim upper 2 is a thick specification, the upper edge portion of the door trim lower 3 is pressed in a direction opposite to the mounting direction, and It has been pointed out that the projecting amount of the sonic wave boss 4 also does not conform to the set value, and the mounting strength between the door trim upper 2 and the door trim lower 3 is reduced, so that sufficient mounting strength cannot be obtained.
[0006]
In addition, when the projection amount of the ultrasonic boss 4 is small, the ultrasonic welding time is prolonged, and the appearance of the surface of the door trim lower 3 such as the surface gloss becomes poor due to the ultrasonic welding boss 4. It has been pointed out that there is a problem of giving a sense of incongruity in appearance and inducing poor appearance.
[0007]
In addition, the door trim upper 2 and the door trim 3 lower are connected to the mounting hole 5 formed in the door trim upper 2 at a plurality of (usually 5, 6) ultrasonic welding fixing points along the joining line L. The ultrasonic boss 4 of the lower 3 is inserted and ultrasonic processing is performed with an ultrasonic jig (ultrasonic horn). However, the positioning and temporary holding work of the two parts 2 and 3 are troublesome. This is a factor that reduces productivity.
[0008]
The present invention has been made in view of such circumstances, and is composed of an upper and lower bisected body of a door trim upper formed by sticking a skin material to a resin core material surface and a door trim lower formed by injection molding of a synthetic resin. To provide a door trim for an automobile door trim that can easily position a trim upper and a trim lower, enhance mounting strength, and can be inexpensive and prevent appearance defects such as surface gloss as much as possible. With the goal.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the invention of the present application is divided into upper and lower two parts: a door trim upper formed by adhering a skin material to a surface of a resin core formed into a required shape, and a door trim lower formed by injection molding of a synthetic resin. In a door trim for a vehicle composed of a body, the door trim upper and the ultrasonic boss on the back side of the upper edge side of the door trim lower along the joining line of the door trim lower are formed at appropriate intervals, A mounting hole for inserting the ultrasonic boss and a locking hole for engaging with the locking claw are formed along the lower edge of the door trim upper, and the ultrasonic fixing point and the engaging fixing point are mixed along the joining line. The engagement fixing points are set at at least two places, and the door trim upper and the door trim lower are temporarily fixed at the engagement fixing points, Characterized in that the protruding amount of clearance and ultrasonic boss between A trim upper and Doatorimuroa were to be maintained constant.
[0011]
Here, the door trim upper constituting the door trim includes a resin core material formed into a required shape by mold press molding using a polypropylene resin (hereinafter referred to as PP resin) mixed with a filler such as talc, and a surface of the resin core material. And a laminated sheet material lined with a skin layer such as a cloth, a nonwoven fabric, a synthetic resin sheet, or a foam layer such as a polyurethane foam or a polyolefin resin foam on the back surface of the skin layer.
[0012]
The door trim lower is made of an injection molded body of a synthetic resin such as a PP resin, and is integrally formed with an opening for a door pocket and a speaker grill.
[0013]
Next, as a joint structure between the door trim upper and the door trim lower, the upper side edge of the door trim lower is wrapped on the lower surface of the door trim upper, and is fixed via a plurality of fixing points along the joint line between the two.
[0014]
The above-mentioned fixing point is characterized by a mixture of ultrasonic fixing point and fastening fixing point.As the ultrasonic fixing point, the ultrasonic boss protrudingly formed on the back of the door trim lower corresponds to the door trim upper. This is performed by ultrasonic welding the tip of the ultrasonic boss by inserting it into the mounting hole provided as a lock, and the engaging claw provided on the back of the door trim lower corresponds to the door trim upper It is carried out by engaging and fixing in a locking hole provided in advance.
[0015]
As is apparent from the above configuration, according to the present invention, since the ultrasonic fixing point and the engaging fixing point are mixed as the fixing point for joining the door trim upper and the door trim lower, the ultrasonic fixing is performed. Since the number of points can be reduced as compared with the conventional one, the ultrasonic welding equipment can be simplified.
[0016]
Furthermore, at the engagement fixing point, in order to engage and fix the locking claw provided on the door trim lower in the locking hole of the door trim upper, when the door trim upper is positioned on the door trim lower, not only the two members are simply overlapped, Since the clearance between the two can be maintained constant at the engagement point and the projection amount of the ultrasonic boss can always be maintained at an appropriate amount, appropriate mounting strength can be obtained, and the ultrasonic welding time is prolonged, resulting in surface defects and the like. There is no fear.
[0017]
Next, according to the invention of the present application, the engagement fixing points formed along the joining line between the door trim upper and the door trim lower are set at at least two places, so that both members can be temporarily fixed and fixed. Since the door trim upper and the door trim lower are temporarily fixed at the attaching / fixing point, the ultrasonic boss does not come off from the mounting hole at the ultrasonic fixing point, so that work such as resetting work is not required.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of an automobile door trim according to the present invention will be described in detail with reference to the accompanying drawings.
[0019]
FIG. 1 is a front view showing a first embodiment of an automobile door trim according to the present invention, FIG. 2 is a cross-sectional view showing the configuration of the automobile door trim shown in FIG. 1, FIG. 3 and FIG. It is each principal part expanded sectional view which shows the structure of the joining part with a trim lower.
[0020]
1 and 2, the door trim 10 for an automobile is composed of an upper and lower divided body of a door trim upper 20 and a door trim lower 30. More specifically, as shown in FIG. 2, in the present embodiment, the door trim upper 20 is provided with a cloth back surface on a surface of a resin core material 21 formed by molding a talc-mixed PP resin into a required shape by mold press molding. A skin material 22 lined with a foam layer such as a polyethylene foam is adhered to the resin material 22. Usually, the skin material 22 is bonded and integrated during the mold press molding of the resin core material 21.
[0021]
On the other hand, the door trim lower 30 is formed into a required shape by injection-molding a PP resin (or a material containing a predetermined amount of talc), and the door pocket opening 31 and the speaker grill portion 32 are integrally formed. I have. The door trim upper 20 and the door trim lower 30 are joined and fixed along a joining line L via a plurality of fixing points.
[0022]
Incidentally, the structural feature of the automotive door trim 10 according to the present invention is that the ultrasonic fixing point A and the fastening fixing point B are mixed along the joining line L between the door trim upper 20 and the door trim lower 30. is there.
[0023]
That is, specifically, as shown in FIG. 3, the ultrasonic fixing point A is formed by wrapping the upper side of the door trim lower 30 on the lower surface of the door trim upper 20 and arranging the ultrasonic boss on the rear surface of the door trim lower 30. The ultrasonic boss 33 is inserted into the mounting hole 23 of the door trim upper 20, and the tip of the ultrasonic boss 33 is caulked with an ultrasonic horn to perform ultrasonic welding and fixing. Done.
[0024]
Next, at the engagement fixing point B, similarly, as shown in FIG. 4, similarly, at the lap portion between the door trim upper 20 and the door trim lower 30, a locking claw 34 is formed projectingly on the back surface of the door trim lower 30, and accordingly, A lock hole 24 is formed in the door trim upper 20 at a position where the door trim upper portion 20 is located.
[0025]
Then, at the engagement fixing point B between the door trim upper 20 and the door trim lower 30, the engaging claw 34 is engaged and fixed in the engaging hole 24, so that the surface of the resin core material 21 in the door trim upper 20 is The clearance a between the upper edge 30a of the door trim lower 30 is always kept constant. For example, the clearance a does not change due to the variation in the thickness of the skin material 22 of the door trim upper 20. The insertion amount of 33 (indicated by the symbol b in FIG. 3) is always kept constant.
[0026]
As described above, according to the vehicle door trim 10 according to the present invention, the ultrasonic fixing point A and the fastening fixing point B are mixed as the joint structure between the door trim upper 20 and the door trim lower 30, so that the door trim upper 20 is formed. Even when the thickness of the skin material 22 varies, the insertion amount b of the ultrasonic boss 33 can always be kept constant, so that a strong mounting strength can be obtained, and the quality performance of the door trim 10 can be improved. Prolonged sonic welding time does not cause appearance defects and the like, and there is an advantage that productivity can be improved since surface defects can be significantly reduced.
[0027]
Furthermore, if the door trim upper 20 and the door trim lower 30 are joined and fixed via the fixing point B, the temporary holding is performed while the clearance a between the surface of the door trim upper 20 and the upper edge 30a of the door trim lower 30 is kept constant. Since the ultrasonic boss 33 does not come off from the mounting hole 23 at the ultrasonic fixing point A, the setting operation in the ultrasonic process can be easily and reliably performed, and the resetting operation due to the ultrasonic boss 33 coming off is also possible. The workability can be improved, for example, it can be abolished, and the number of installation points of the ultrasonic fixing point A can be reduced. Therefore, the ultrasonic jig can be simplified, and the ultrasonic oscillator is expensive. This has the effect of inducing a significant cost reduction.
[0028]
【The invention's effect】
As described above, the present invention has the following special functions and effects.
[0029]
(1) According to the invention of the present application , a door trim for an automobile is composed of an upper and lower divided body of a door trim upper formed by sticking a skin material to a resin core material surface and a door trim lower formed by injection molding of a synthetic resin. Since the ultrasonic fixing point and the fastening fixing point for joining and fixing the upper and the door trim lower are joined together along the joining line of the upper and the door trim lower, the door trim upper is fixed at the engaging fixing point between the door trim upper and the door trim lower. Since the clearance between the resin core material and the door trim lower can always be kept constant, and the insertion amount of the ultrasonic boss can be kept constant, strong fixing strength at the ultrasonic fixing point is obtained, and the door trim upper and The mounting strength with the door trim lower can be enhanced, and the door trim upper can be Without the Atorimuroa is out has the effect that quality performance of the door trim can be enhanced.
[0030]
(2) According to the present invention, a door trim for an automobile door trim comprising an upper and lower divided body of a door trim upper in which a skin material is adhered to a surface of a resin core material and a door trim lower made of an injection molded body of synthetic resin. Since the ultrasonic fixing point and the fastening fixing point for joining and fixing the upper and the door trim lower are joined along the joining line, the ultrasonic boss is inserted due to the thickness variation of the skin material in the door trim upper. The degree of freedom in the selection of the skin material can be increased without being affected by the amount, and there is no appearance defect such as surface gloss due to the prolonged processing time during ultrasonic processing. This has the effect of improving the appearance and reducing appearance defects.
[0031]
(3) According to the present invention, a door trim for an automobile door trim comprising an upper and lower two-piece body including a door trim upper formed by attaching a skin material to the surface of a resin core and a door trim lower formed by injection molding of a synthetic resin. An ultrasonic fixing point for joining and fixing the upper and door trim lowers along the joint line and an anchoring fixing point are mixed, and a part of the conventional ultrasonic fixing point is replaced as an anchoring fixing point With this configuration, the number of ultrasonic horns and oscillators can be reduced, and there is an effect that a significant cost reduction accompanying simplification of ultrasonic processing equipment can be brought about.
[0032]
(4) According to the invention of the present application , at least two engagement fixing points between the door trim upper and the door trim lower are provided, and the door trim upper and the door trim lower are temporarily fixed at these engagement fixing points. When positioning the door trim upper and the door trim lower, there is no problem that the ultrasonic boss comes off from the mounting hole at the ultrasonic fixing point due to the engaging force at the engaging fixing point. This has the effect that the ultrasonic welding process can be smoothly carried out.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of an automobile door trim according to the present invention.
FIG. 2 is a sectional view taken along line II-II in FIG.
FIG. 3 is an enlarged sectional view of a main part showing a configuration of an ultrasonic fixing point in the vehicle door trim shown in FIG. 1;
FIG. 4 is an enlarged sectional view of a main part showing an engagement fixing point in the automobile door trim shown in FIG. 1;
FIG. 5 is a front view showing a conventional automobile door trim.
FIG. 6 is a sectional view taken along line VI-VI in FIG. 5;
FIG. 7 is an enlarged sectional view showing a configuration of an ultrasonic fixing point in a conventional automobile door trim.
[Explanation of symbols]
10 Automotive Door Trim 20 Door Trim Upper 21 Resin Core Material 22 Skin Material 23 Mounting Hole 24 Locking Hole 30 Door Trim Lower 33 Boss for Ultrasonic 34 Locking Claw A Ultrasonic Fixing Point B Engagement Fixing Point a Clearance b Ultrasonic Boss Insertion amount

Claims (1)

Upper and lower halves of a door trim upper (20) formed by attaching a skin material (22) to the surface of a resin core material (21) formed in a required shape, and a door trim lower (30) formed by injection molding of a synthetic resin. In a car door trim consisting of a body,
Along with the door trim upper (20) and the door trim lower (30) joining line (L), an ultrasonic boss (33) and a locking claw (34) are appropriately provided on the rear surface of the upper side of the door trim lower (30). A mounting hole (23) for inserting the ultrasonic boss (33) along a lower edge of the door trim upper (20) along with a lower edge of the door trim upper (20) and a locking hole for engaging with the locking claw (34). 24) are formed, and the ultrasonic fixing point (A) and the fixing fixing point (B) are mixed along the joining line (L), and the fixing fixing point (B) is set at at least two places. The door trim upper (20) and the door trim lower (30) are temporarily fixed at the engagement fixing point (B), so that the clearance between the door trim upper (20) and the door trim lower (30) and the ultrasonic wave are used. Automotive door trim, characterized in that scan the projection amount of (33) were to be maintained constant.

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