JP2890905B2 - Weld nut structure attached to automobile body and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weld nut structure attached to a body of an automobile and a method of manufacturing the same, and more particularly to a weld nut structure which is easy to manufacture and whose liquid tightness is not deteriorated by repeated use. It is to provide a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
A weld nut 2 having a liquid-tight structure is attached to a body 1 of an automobile such as a cab of a truck. As shown in FIG. 4, a nut of this type has a spot sealer 1 inside a body 1.
1, a weld nut 10 is welded so as to penetrate both members 11 and 12, and when not in use, a sealing bolt 13 is screwed into the nut 10 to be liquid-tight. In addition to maintaining the performance, the seal bolt 13 is removed when the body 14 is attached, and the body 14 is screwed.

[0003]

However, once the seal bolt 13 is removed, the sealing material that has adhered to the threaded surface of the seal is peeled off, so that it must be re-attached to each of the mountings. In addition to complicating the work, it is difficult to mount the system at the user stage while maintaining the above-mentioned sealing properties completely, and often water leakage occurs due to incomplete sealing, and rust is generated. Lead to the cause.

In order to solve such a drawback, it is conceivable to adopt a configuration in which the terminal side of the weld nut is sealed in a bag shape. It has the drawback that it is full and the use of screw parts becomes impossible.

SUMMARY OF THE INVENTION In view of the drawbacks of the prior art, it is an object of the present invention to provide a weld nut structure which is easy to manufacture and does not cause water leakage or the like even when repeatedly used, and a method for manufacturing the same.

[0006]

According to the first aspect of the present invention, a portion which is substantially perpendicular to the mounting position on the side of the vehicle body 1 is provided.
The weld nut 2 is sealed at its distal end with a bag-shaped sealing portion 21 having a through hole 22 formed therein, and a sealer material 23 for sealing the through hole 22 in a liquid-tight manner. The present invention proposes a weld nut structure characterized by being formed from a thermo-softening sealer material that solidifies.
The sealer material 23 is generally formed by a molded sealer, but is not limited to this.

A second invention relates to a method for manufacturing the weld nut structure, and comprises the following four steps. 1) A step of forming a weld nut 2 having a bag-shaped sealing portion 21 provided with a through hole 22 at a desired location on the end side, for example, fixing the sealing portion 21 to the nut main body 20,
A step of performing plating, if necessary, after the precursor is moved to a predetermined position. 2) a step of fixing the weld nut 2 directly or indirectly via a reinforcing member 3 to the body component panel 1 so that the through hole 22 is located substantially below the perpendicular direction when the body is completed; 3) the body A step of loading a sealer material 23 into the sealing portion 21 of the weld nut 2 at least after completion of the electrodeposition coating of the panel 1 or a unit formed by fusing the panel 1) 4) In the sealing portion 21 A step of softening the sealer material 23 by a predetermined heat treatment means before or after filling, and liquid-tightening the through hole 22 through the sealer material 23. The fourth step is generally performed by the sealer material 23. The through-hole 22 is made liquid-tight by using a molded sealer that solidifies at room temperature and softening the sealer in a paint baking step and other heat treatment steps performed after charging the sealer. Independent softening step by constituting the so that it is unnecessary, preferred.

[0008]

In such a technical means, since the sealing portion 21 in which the through hole 22 is made liquid-tight with the sealer material 23 is provided on the terminal side instead of the threaded portion of the weld nut 2, in other words, there is nothing on the nut threaded portion. Since the sealer material 23 does not exist, there is no deterioration in liquid tightness even if the sealer material 23 is used repeatedly. Further, since the through-hole 22 is open until the end of the electrodeposition coating, the through-hole 2 is formed at the time of pre-coating treatment such as plating and pickling performed before coating.
2 acts as a drainage hole so that these treatments can be carried out smoothly.
The paint does not come off more and the use of the screw part is not impossible.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; However, unless otherwise specified, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention, but are merely illustrative examples. Not just. FIG.
1 is a perspective view showing an appearance of a weld nut according to an embodiment of the present invention, FIG. 1 is a cross-sectional view showing a state in which the nut is attached to a desired portion of a cab body, and (a) and (b) are enlargements of respective nut attachment portions. It is sectional drawing. The weld nut 2 will be described later as a nut body 20 in which a sealing ring projection 201 is formed around a seat hole diameter of a hexagonal nut with a seat, and three projection point projections 202 are projected outwardly at 120 ° angular intervals. It consists of a bag 21. In addition, the ring projection 201 is formed into a shape that can easily block water that enters from a joint portion with the reinforcing member 3 described later, specifically, into a wedge-shaped or triangular cross-section.

[0010] A hemispherical bag 21 is hermetically sealed at the end of the nut main body 20 (at the side opposite to the seat). It is preferable that both the nut 2 and the bag 21 are made of stainless steel. However, the present invention is not limited to this, and the nut 2 and the bag 21 may be formed of a metal material without each. The bag body 21 can be formed using a resin body as long as it can withstand a heat treatment or an acid washing treatment described later.

When the bag 21 is formed of a thin metal plate, it is preferable in terms of production to form it by injection molding. The fixing means of the two members 20, 21 is also generally fixed by welding, but is not limited to this, and brazing or bonding means may be used.

Next, a description will be given of a manufacturing procedure until the nut 2 with a bag is mounted on an automobile body. First, a through hole 22 is formed at a desired position of the bag body 21 of the nut 2 with a bag, more specifically, at a position substantially coincident with a vertical line when the vehicle body is mounted, and then a rust-proofing treatment such as galvanization is performed (the above-described method). This process is omitted when both members are made of stainless steel.) At this time, since the through hole 22 functions as a drain hole, the plating solution does not remain in the bag body 21,
Smooth plating can be performed. 2A shows a case where the nut mounting holes 19 on the body 1 are relatively horizontal, and FIG. 2B shows a case where the mounting holes 19 are relatively vertical.

Next, in the hole 31 of the reinforcing member 3 for bringing the plated nut 2 into contact with the back side of the body panel 1,
The holes 19, 31, and 203 are fixed by projection welding in a state where the axes are aligned. At this time, the ring-shaped protrusion 201 is formed around the screw hole in the nut body 2, Even if the welding is projection welding (point welding), sufficient liquid tightness can be maintained.

And a reinforcing member 3 to which the nut 2 is attached.
In a state where the through-hole 22 on the nut 2 side is positioned so as to be substantially coincident with the vertical line at the time of completion as an automobile body, and while the axes of the holes 19, 31, 203 are aligned with each other,
The body panel (for example, a roof panel) 1 is welded to the back side. Then, at the time of the welding, a washer-shaped thin plate-shaped spot sealer 32 having a thickness of about 1 mm was attached to the both members 3 /.
It is preferable to intervene between the two to prevent intrusion such as water leakage.

After the pre-treatment, such as pickling, of the welded body panel 1, intermediate coating and top coating are performed by electrodeposition coating, and after the final coating, a spherical shape is formed in the sealing portion 21 of the weld nut 2. The molded sealer 23A is charged. At this time, the molding sealer 23A is in a solidified state at room temperature, and a material is selected that is soft enough to be thermally softened in a coating baking step described later.

Then, the panel 1 is subjected to paint baking to thermally soften the sealer 23A. The through hole 22 is made liquid-tight by the softened sealer 23, and then cooled to room temperature. After solidification, the seal bolt 25 is screwed into the screw hole 203 of the nut 2 to complete the process.

[0017]

As described above, according to the present invention, since the sealing portion provided on the terminal end side of the nut is liquid-tightly sealed after the completion of the electrodeposition coating, the plating process, the pre-treatment and the coating process are also possible. A weld nut structure can be provided that does not cause any obstacles and does not cause a seal member to adhere to the weld nut screw portion, so that water leakage does not occur even when repeatedly used. And so on.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a weld nut mounting structure according to an embodiment of the present invention showing a state in which a weld nut is mounted on a desired portion of a cab body, and (a) and (b) are enlarged views thereof.

FIG. 2 is a perspective view showing an appearance of a weld nut shown in FIG.

FIG. 3 shows an application example of a weld nut structure of the present invention.

FIG. 4 shows a weld nut mounting structure according to the prior art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body 2 Weld nut 20 Nut main body 21 Sealing part 22 Through hole 23 Sealer material

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-125814 (JP, A) JP-A-63-137775 (JP, A) JP-A-63-34313 (JP, A) 23015 (JP, A) JP-A-63-23016 (JP, A) JP-A-3-113111 (JP, A) JP-A-63-19411 (JP, A) JP-A-63-80310 (JP, U) Japanese Utility Model Application Showa 63-2714 (JP, U) Japanese Utility Model Application Showa 63-20516 (JP, U) Japanese Utility Model Application Showa 62-6520 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16B 37/06 F16B 37/14

Claims (3)

(57) [Claims] 1. A weld nut whose end is sealed by a bag-shaped sealing portion having a through hole at a position substantially perpendicular to a mounting position on the vehicle body side, and a sealer material for sealing the through hole. Characterized in that the sealer material is formed of a heat-softening sealer material that solidifies at least at room temperature. 2. A step of forming a weld nut in which a bag-shaped sealing portion having a through hole perforated at a desired position is provided at a terminal side, and such that the through hole is positioned substantially vertically below when the body is completed. Fixing the weld nut directly or indirectly to a predetermined portion of the body constituting panel, and loading a sealer material into a sealing portion of the weld nut after at least the electrodeposition coating, wherein the sealing is performed. A method for manufacturing a weld nut structure, wherein the sealer material is softened by a predetermined heat treatment means before or after charging into the part, and the through hole is liquid-tight through the sealer material. 3. A through-hole is made liquid-tight by using a molded sealer that solidifies at room temperature and thermally softening the sealer in a paint baking step and other heat treatment steps performed after the molding sealer is charged. The method for manufacturing a weld nut structure according to claim 2.