JPH11208271A - Joining structure for trim made of synthetic resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance joining strength without making a boss portion thicker or increasing a caulking amount. SOLUTION: In this joining structure, a boss portion 13 which is integrally formed at the upper end 12 of a lower trim 2 is in a state of passing through a joining hole 11 which is formed at the lower end 10 of an upper trim 3. The boss portion 13 which has passed through the joining hole 11, further passes through a passing hole 14 for a backing material 15 made of thermoplastic synthetic resin. Then an edge of the boss portion 13 which protrudes from the passing hole 14 is caulked by heating at a temperature at which even the backing material 15 is melted. Therefore, a surface of the backing material 15 is also melted when the edge of the boss portion 13 is caulked by heating, thereby a formed caulked portion 16 and the backing material 15 are integrally welded. This increases an engagement force with the joining hole 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a joint structure of a synthetic resin trim.

[0002]

2. Description of the Related Art A conventional joining structure in which one trim made of a thermoplastic synthetic resin is joined to an end of the other trim in a state where the other trim is overlapped, is formed integrally with one trim end. The boss portion was made to penetrate the coupling hole formed at the end of the other trim, and a metal washer was passed through the boss portion, and the tip of the boss portion protruding from the washer was heated and swaged. (See Japanese Utility Model Laid-Open No. 4-49511 for a similar technique.)

When the tip of the boss is heated and swaged, a large-diameter swage is formed at the end of the boss. The swage and the washer engage with the coupling hole of the other trim. Thus, the one and the other trims are joined together. Since the bonding strength between the trims is improved in accordance with the size of the crimped portion at the tip of the boss, it is necessary to increase the thickness of the boss as much as possible and to increase the amount of the boss that is heated and crimped.

[0004]

However, if the boss is formed too thick, sinks occur on the surface of the trim, and there is a limit to the thickness of the boss. Further, when the amount of caulking by heating is increased, the caulking operation becomes difficult.

The present invention has been made by paying attention to such a conventional technique. A synthetic resin trim capable of increasing the bonding strength without increasing the thickness of the boss portion and increasing the amount of caulking is provided. It provides a coupling structure.

[0006]

According to the first aspect of the present invention,
A joining structure of a synthetic resin trim in which the end of one trim made of a thermoplastic synthetic resin and the end of the other trim are joined in a state of being overlapped, and integrally formed with the end of one trim. The boss portion is made to penetrate the coupling hole formed at the end of the other trim, and the boss portion penetrating the coupling hole is passed through an insertion hole of a backing material made of a thermoplastic synthetic resin. The tip of the boss protruding from the hole is heated and swaged at a temperature at which the backing material is also melted.

According to the first aspect of the present invention, when the tip of the boss is heated and swaged, the surface of the backing material also melts, so that the formed swaged portion and the backing material are welded. Integrate. Therefore, the backing material also functions as a part of the crimping part, and the engagement force with the coupling hole increases, so that the joint strength of both trims is improved without making the boss part thicker and increasing the amount of crimping. I do.

The invention according to claim 2 is characterized in that the backing material is made of the same synthetic resin material as one of the trims.

According to the second aspect of the present invention, since the backing material and one trim are made of the same synthetic resin material and both are melted at the same temperature, the temperature adjustment during heating is easy.

According to a third aspect of the present invention, a plurality of the bosses are formed along one end of one trim, and the backing member has a plurality of insertion holes corresponding to each boss. It is characterized by being a single piece.

According to the third aspect of the present invention, since the plurality of bosses are connected to each other by one backing material, both trims are different from the case where separate backing materials are provided for each boss. The bonding strength between them is further improved.

[0012]

According to the first aspect of the present invention, when the tip of the boss is heated and swaged, the surface of the backing material is also melted, so that the formed swaged portion is welded to the backing material. And integrate. Therefore, the backing material also functions as a part of the crimping part, and the engagement force with the coupling hole increases, so that the joint strength of both trims is improved without making the boss part thicker and increasing the amount of crimping. I do.

According to the second aspect of the present invention, since the backing material and one trim are made of the same synthetic resin material and both are melted at the same temperature, the temperature can be easily adjusted when heating.

According to the third aspect of the present invention, since the plurality of bosses are connected to each other by one backing material, both trims can be compared with the case where separate backing materials are provided for each boss. The bonding strength between them is further improved.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to FIGS. Reference numeral 1 denotes a door trim, which is a lower trim divided into upper and lower parts (one trim).
2 and an upper trim (the other trim) 3. The lower trim 2 and the upper trim 3 are both made of polypropylene which is a thermoplastic synthetic resin, and the skin cloth 4 is applied only to the surface of the upper trim 3.

The door trim 1 is located at the center between the upper and lower sides of the vehicle.
It is divided by an armrest 5 bulging to the side. Moreover, the armrest 5 is also divided into front and rear parts, and the front part 6 is formed integrally with the lower trim 2 and the rear part 7 is formed integrally with the upper trim 3. An opening 8 for an operation panel is formed in the front part 6, and an opening 9 for an ashtray is formed in the rear part 7.

The upper trim 3 and the lower trim 2 are combined to form an armrest 5.
The connection at the front portion 6 and the like of the armrest 5 is a connection by ordinary ultrasonic welding, but a special device is applied to the connection of the rear portion 7 to which the load from the occupant's arm is mainly applied.

That is, the lower portion 10 of the upper trim 3 on the rear side 7 of the armrest 5 is bent downward, and the lower end portion 10 is formed with four coupling holes 11. The upper end 12 of the lower trim 2, which is superimposed on the lower end 10 from the vehicle interior R side, has a
The boss 13 of the book is formed integrally. On the back side of the lower end portion 10 of the upper trim 3, a single backing material 15 having an insertion hole 14 corresponding to the rear three coupling holes 11 to which a load from the occupant's arm is particularly applied is provided. This backing material 15 is also made of the same synthetic resin material as the upper trim 3 and the lower trim 2.

Next, a method of connecting the upper trim 3 and the rear trim 7 at the rear portion 7 will be described. First, the boss 13 formed on the upper end 12 of the lower trim 2 is inserted into the coupling hole 11 formed on the lower end 10 of the upper trim 3 so as to be in a penetrated state. Next, the boss portion 1 penetrating the coupling hole 11
3 (three on the rear side) is passed through the insertion hole 14 of the backing material 15.
The boss 1 protruding from the insertion hole 14 of the backing material 15
3. Ultrasonic heating and caulking. At this time, since the backing material 15 is also the same synthetic resin material as the boss portion 13, the surface is melted, and the formed caulked portion 16 and the backing material 15 are welded and integrated. Therefore, the backing material 15 also functions as a part of the caulking portion 16 and the engaging force with the coupling hole 11 increases, so that the lower trim 2 and the lower trim 2 can be connected without increasing the thickness of the boss portion 13 or increasing the caulking amount. The bonding strength of the upper trim 3 is improved.

Further, since the backing material 15 and the boss 13 are made of the same synthetic resin material and are melted at the same temperature, it is easy to adjust the temperature when heating. Furthermore, three bosses 13
Are connected to each other by one backing material 15, so that the bonding strength between the lower trim 2 and the upper trim 3 is further improved as compared with a case where a separate backing material is provided on each boss portion 13.

In the above embodiment, the door trim 1 which is divided into upper and lower parts is taken as an example. However, the present invention can be applied to, for example, connection of a side trim and a pillar trim. Also,
The present invention can be applied not only to the connection in the up-down direction but also to the connection in the front-back or left-right direction. Further, only one trim on which the boss portion is formed may be formed of the thermoplastic synthetic resin, and the material of the other trim is not limited.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state before an upper trim and a lower trim are combined.

FIG. 2 is a side view showing a state after the upper trim and the lower trim are combined.

FIG. 3 is a sectional view taken along the line SA-SA shown in FIG. 2;

[Explanation of symbols]

 2 Lower trim (one trim) 3 Upper trim (the other trim) 10 Lower end 11 Connecting hole 12 Upper end 13 Boss 14 Insertion hole 15 Backing material 16 Caulking part

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kenji Shika 2 Nissan Motor Co., Ltd., Takaracho, Kanagawa-ku, Yokohama, Kanagawa

Claims (3)

[Claims] 1. A joint structure of a synthetic resin trim in which an end of one trim made of thermoplastic synthetic resin is joined to an end of the other trim in a state where the end of the trim is overlapped with the end of the trim. The boss part integrally formed with the part is made to penetrate the coupling hole formed at the end of the other trim, and the boss part penetrating the coupling hole is inserted through the backing material made of thermoplastic synthetic resin. A synthetic resin trim connecting structure, wherein a tip of a boss protruding from the insertion hole is heated and crimped at a temperature at which the backing material is also melted. 2. The bonding structure of a synthetic resin trim according to claim 1, wherein the backing material is made of the same synthetic resin material as one of the trims. Construction. 3. The joint structure for a synthetic resin trim according to claim 1, wherein a plurality of the bosses are formed along an end of one of the trims, and A joint structure of a synthetic resin trim, wherein the material is a single piece having a plurality of insertion holes corresponding to each boss portion.