JP3674798B2 - Mounting structure and mounting method for automobile weather strip - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mounting structure and mounting method for a weather strip for an automobile that prevents the occurrence of meandering of the weather strip due to a difference in linear expansion and exhibits an excellent effect in assembling workability.
[0002]
[Prior art]
In automotive door trims that have a windstrip weatherstrip installed on the garnish of the door trim body, the door trim body and weatherstrip are usually bonded and fixed with an adhesive. There was a phenomenon that a weather strip having a large expansion rate was extended more due to the difference in linear expansion, and meandering was generated.
[0003]
Therefore, as a mounting structure capable of absorbing the difference in linear expansion as described above, a base member having an L-shaped cross section is attached to the garnish portion of the door trim body, and a core metal is embedded in the base member. There have been proposed ones in which a weather strip is mounted with the above-described metal core cut-and-raised claw, and in which a weather strip is attached to a door trim main body by slide fitting (see, for example, Japanese Utility Model Laid-Open No. 60-55519).
However, the former has a problem that the number of parts is very large and the assembly work is complicated, and the production cost cannot be reduced and the weight cannot be reduced. However, there is a problem that a great restriction is imposed on the design of the mounting surface.
[0004]
[Problems to be solved by the invention]
The present invention solves the conventional problems as described above and can surely prevent the occurrence of weather strip meandering due to a difference in linear expansion, and also reduces the number of parts, facilitates assembly work, and reduces weight. The present invention has been completed with the object of providing a mounting structure and mounting method for an automotive weatherstrip that can expand the degree of freedom of the design of the mounting surface without the need to slide the weatherstrip and insert it. Is.
[0005]
[Means for Solving the Problems]
The present invention made in order to solve the above-mentioned problem is a weather strip which is attached to the garnish portion of the door trim body with a holding frame portion having a substantially U-shaped cross section formed with the weather strip inserted in the horizontal direction . In the mounting structure, the weather strip is formed with a concave groove formed in a direction intersecting with the insertion direction of the weather strip in the lower jaw portion of the holding frame portion, while the door trim main body is temporarily reacted and solidified in the garnish portion. As a result, a hot melt adhesive that does not remelt is reacted and solidified to provide a fitting convex portion that is in an adhesive state but not in an adhesive state on the door trim body. against weatherstrip door trim body by the engagement convex portion and the concave groove, coming off the insertion direction A structure for mounting an automotive weather strip characterized by being slidable in the direction of the concave groove, and a concave groove formed in the lower jaw portion of the holding frame portion having a substantially U-shaped cross section formed in the weather strip. In addition, a mold release agent is applied to the concave groove in advance, and once melted by reaction, it is filled with a hot-melt adhesive that does not remelt, and the garnish portion of the door trim body is fitted into the sandwiching frame portion so that the concave groove By reacting and solidifying the adhesive inside, the solidified adhesive is bonded to the door trim body, but the concave groove is made into a fitting convex portion that has been made non-bonded by the release agent described above. The weather strip is attached to the door trim main body slidably along the groove by the joint convex portion.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
In the figure, 1 is a door trim body, 2 is a weather strip for windshield sealing mounted on the garnish portion of the door trim body 1, and the weather strip 2 has a main body portion 21 and a cross-sectional view provided at the upper end of the main body portion 21. It is composed of a U-shaped holding frame portion 22 and a lip portion 23 stretched on the back side of the main body portion 21. The above-described sandwiching frame portion 22 is obtained by connecting an upper jaw portion 22b and a lower jaw portion 22c longer than this by a connecting portion 22a, and fixing both by inserting the garnish portion of the door trim body 1 into the sandwiching frame portion 22. Is basically the same as the conventional one, but a concave groove 24 is formed in the lower jaw portion 22c of the holding frame portion 22, while the concave groove 24 is formed on one side of the garnish portion of the door trim body 1 described above. The fitting projection 11 is formed so as to be slidable in the groove direction of the groove 24 when the weather strip 2 is attached to the door trim body 1. The concave groove 24 may be a dovetail groove with the back side widened in a dovetail shape. In this case, the fitting convex portion 11 is not lost, which is more preferable. Since this fitting convex portion 11 will be described in a method for mounting an automotive weather strip described below, a description thereof will be omitted.
[0007]
Hereinafter, the process of the present invention for mounting the weather strip 2 on the garnish portion of the door trim body 1 will be described.
As shown in FIG. 2, a weather strip 2 is prepared by forming a concave groove 24 in the lower jaw portion 22c of the holding frame portion 22 having a substantially U-shaped cross section, and inside the concave groove 24 as shown in FIG. A release agent 12 is applied in advance. Next, as shown in FIG. 4, an appropriate amount of hot-melt type adhesive 13 that does not re-melt once it has been reacted and solidified in the groove 24 is filled in a bead shape. As the hot-melt adhesive 13, for example, a moisture-curable urethane-based synthetic resin such as “Hybon 4832” (trade name of Hitachi Chemical Polymer Co., Ltd.) is used, and heat is applied after the adhesion reaction. A material that can maintain a predetermined shape without being remelted is used.
[0008]
Next, as shown in FIG. 5, the garnish portion of the door trim main body 1 is horizontally fitted from the opening side of the holding frame portion 22 toward the connecting portion 22a and heated, and the reaction solidification of the adhesive is completed. Hold that state until. When this adhesion reaction is completed, the adhesive 13 is solidified according to the inner shape of the concave groove 24, but since the release agent 12 is applied in advance in the concave groove 24, the door trim body 1 is in an adhesive state. However, the concave projection 24 is formed with the fitting convex portion 11 in a non-adhered state. As a result, the weather strip 2 does not fall out from the door trim main body 1 in the horizontal direction, which is the insertion direction, by the fitting convex portion 11, and the weather strip 2 slides in the groove direction with respect to the door trim main body 1. It can be attached freely.
[0009]
In this way, the door trim body 1 is formed with the fitting groove 11 in the non-adhered state in the groove 24 of the weather strip 2 on the door trim body 1 so that both are connected, and the weather strip 2 is connected to the door trim body 1. Since it can slide freely in the direction of the concave groove, even if the weather strip 2 having a large coefficient of thermal expansion expands more than the door trim body 1 due to thermal expansion during use, the weather strip 2 is straight along the fitting convex portion 11. It does not cause meandering as in the prior art. In addition, despite the structure for preventing meandering, there is no restriction on the design of the weather strip mounting surface shape because it is not a conventional insertion structure.
[0010]
【The invention's effect】
As is apparent from the above description, according to the weather strip mounting structure for automobiles of the present invention, the occurrence of meandering of the weather strip due to the difference in linear expansion can be reliably prevented, and the number of parts can be reduced. The assembly work can be facilitated and reduced in weight, and further, it is not necessary to slide and insert the weather strip, and the degree of freedom in designing the mounting surface can be expanded. In addition, according to the method for mounting a weather strip for automobiles of the present invention, the mounting structure as described above can be easily obtained.
Therefore, the present invention greatly contributes to the development of the industry as a mounting structure and mounting method for a weather strip for automobiles that eliminates the conventional problems.
[Brief description of the drawings]
FIG. 1 is a partially cutaway perspective view showing an embodiment of an automotive weather strip mounting structure according to the present invention.
FIG. 2 is a partially cutaway perspective view of a weatherstrip.
FIG. 3 is a cross-sectional view showing a state where a release agent is applied to the groove.
FIG. 4 is a cross-sectional view showing a state in which an adhesive is supplied to the groove.
FIG. 5 is a cross-sectional view showing a process of fitting the garnish portion of the door trim main body into the holding frame portion.
FIG. 6 is a partially cutaway perspective view showing a door trim body in which a fitting convex portion is formed.
[Explanation of symbols]
1 Door trim body 2 Weather strip
11 Convex protrusion
12 Mold release agent
13 Hot melt adhesive
22 Holding frame
24 groove

Claims (3)

In the weather strip mounting structure in which the weather strip (2) is attached to the garnish portion of the door trim body (1) with a sandwiching frame portion (22) having a substantially U-shaped cross section formed in a horizontal direction as the insertion direction. The weather strip (2) has a concave groove (24) formed in a direction intersecting the insertion direction of the weather strip (2) in the lower jaw portion (22c) of the sandwiching frame portion (22). The main body (1) is bonded to the door trim main body (1) by reacting and solidifying a hot melt adhesive (13) that does not re-melt once reaction solidified in the garnish, but the groove (24) The fitting strip (11) in a non-adhered state is provided, and the weather strip (2) is formed by the fitting projection (11) and the groove (24) to form the door trim body (1). against, Do not fall out in the insertion direction Mounting structure of a weather strip for an automobile but wherein the you have slidable in the groove direction.   A concave groove is formed in the lower jaw part of the holding frame part having a substantially U-shaped cross section formed in the weather strip, a release agent is previously applied to the concave groove, and once the reaction is solidified, the hot which does not remelt The melted adhesive is filled, and the garnish portion of the door trim main body is fitted into the sandwiching frame portion to react and solidify the adhesive in the concave groove, so that the solidified adhesive is bonded to the door trim main body. An automobile characterized in that the concave groove is made into a fitting convex portion that is made non-adhered by the release agent, and the weather strip is slidably attached to the door trim body along the groove by the convex portion for fitting. Mounting method for weather strip.   The method for attaching a weather strip for an automobile according to claim 2, wherein a hot-melt adhesive made of a moisture-curable urethane-based synthetic resin is used.

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