JP3039219B2 - Fastener fixing structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastener fixing structure.

[0002]

2. Description of the Related Art As shown in FIG. 6, a nut 2 is sometimes fixed to a panel member 1 of a vehicle body such as an automobile by welding. A bolt insertion hole (not shown) is formed at a predetermined position of the iron panel material 1, and an iron nut 2 is placed on the bolt insertion hole, and protrusions provided at several locations around the ground surface side of the nut 2 are attached to the panel material 1. To fix the panel member 1 and the nut 2 by resistance welding.

[0003]

However, when the above-mentioned conventional fastener fixing structure is applied to the case where the aluminum nut 2 is fixed to the aluminum panel material 1 in accordance with the same, the electric resistance value of the aluminum becomes iron. Therefore, a high current (11 to 130,000 amperes) is required to weld the two, and there is a problem that the cost is increased.

On the other hand, as shown in FIG. 7, an iron nut 2 is fixed to an iron base plate 3 in advance by welding, and the base plate 3 is fixed to an aluminum panel material 1 by rivets 4. Has been devised,
Holes for the rivets 4 and caulking of the rivets 4 are required, which increases the number of processing steps and leads to an increase in cost.

Accordingly, the present invention is to provide a fastener fixing structure capable of welding an iron nut or the like to an aluminum panel material at low cost.

[0006]

[Means for Solving the Problems] An iron fastener is welded to the iron side surface of a base plate made of aluminum / iron clad material in which aluminum and iron are superposed by rolling, and the aluminum side surface of this base plate is formed into an aluminum plate. After polymerization, the base plate was fixed to the aluminum plate by welding.

A bracket made of aluminum and having a U-shaped cross section is fixed to both outer side surfaces of an aluminum side member used in a vehicle by welding both side edges thereof, and the bracket is formed along the inner side surface and the bottom surface of the bracket. A U-shaped cross section made of aluminum / iron clad material with aluminum on the outer side and iron on the inner side is superposed, and the reinforcement is welded to the bracket and the iron spacer is welded to the bottom of the reinforcement. Then, an iron suspension bolt whose upper portion was supported by a bracket was supported by the spacer.

[0008]

According to the first aspect of the present invention, an iron fastener can be fixed to an aluminum plate by interposing a base plate made of an aluminum / iron clad material. According to the invention described in claim 2, aluminum
By interposing a reinforcement made of iron clad material, it is possible to fix the suspension bolt made of iron to the aluminum bracket fixed to the aluminum side member. Curving deformation is prevented by a reinforce which is heated and tends to fall inward.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

In the embodiment shown in FIGS. 1 and 2, reference numeral 5 denotes an iron nut as a fastener. The nut 5 is welded and fixed on a base plate 6. The base plate 6 is made of aluminum / iron clad material obtained by polymerizing aluminum and iron by rolling.
Is welded to the iron side surface by resistance welding. The aluminum side surface of the base plate 6 is superposed on the aluminum plate 7 on the vehicle body panel side, and the base plate 6 is fixed to the aluminum plate 7 by spot welding. As shown in FIG. 2, a base plate 6 to which the nut 5 is attached and an aluminum plate 7 corresponding thereto
Are formed with bolt insertion holes 8 (not shown).

According to the fastener fixing structure of the above embodiment, the iron nut 2 can be fixed to the aluminum plate 7 on the vehicle body side by interposing the base plate 6. Therefore, for example, the iron nut 2 can be easily attached to a body made of an aluminum body.

Further, when the base plate 6 is spot-welded to the aluminum plate 7, since the electric resistance of the iron-side surface of the base plate 6 is large, a spot negation between aluminum and aluminum can be performed without using a spot welding gun for aluminum. And therefore a spot welding gun for iron can be used.

Further, it is not necessary to perform rivets for attaching the base plate 6 and the aluminum plate 7 and holes for the rivets as in the prior art, thereby reducing the number of parts and the number of working steps and reducing costs.

Here, in the above embodiment, the nut 5 has been described as a fastener, but instead of the nut 5, FIG.
This fastening structure may be adopted for the bolt 9 as shown in FIG. Since other configurations and operations are the same as those of the first embodiment, the same portions are denoted by the same reference numerals and description thereof will be omitted.

Next, an embodiment shown in FIGS. 4 and 5 will be described. In FIG. 4, reference numeral 10 denotes a side member used as a body frame member of an automobile.
Numeral 0 is a member having a U-shaped cross section extruded from aluminum.

On both outer surfaces of the side member 10, both side edges of an aluminum bracket 11 having a U-shaped cross section are fixed by welding.

A reinforcement 1 having a U-shaped cross section is formed along the inner side surface 11a and the bottom surface 11b of the bracket 11.
2 are polymerized and fixed by spot welding. The reinforce 12 is made of an aluminum / iron clad material obtained by polymerizing aluminum and iron by rolling. The outer surface of the bracket 11 is formed of aluminum, and the inner surface is formed of iron. An iron spacer 13 is fixed to the bottom of the reinforcement 12 by welding.
3, an iron suspension bolt 14 penetrating the bracket 11 and the reinforcement 12 is attached by caulking. Here, a retainer 15 made of aluminum is joined between both side walls of the bracket 11 by spot welding, a threaded portion 14a of an upper portion of the suspension bolt 14 is inserted into the retainer 15, and the threaded portion 14a is Are fastened and fixed to the retainer 15.

According to the structure of the above embodiment, by using the reinforce 12 made of aluminum / iron clad material, the aluminum suspension bolt 13 can be supported on the aluminum bracket 11 via the iron spacer 13. . Therefore, there is an advantage in that a suspension bolt 14 used for an iron side member can be used as it is even for a vehicle provided with an aluminum side member 10.

When the side member 10 is exposed to a high temperature, such as during baking of a vehicle body, aluminum has a coefficient of linear expansion approximately twice that of iron. The outer wall of the bracket 11 thus swells and deforms outward as shown by the broken line in FIG. 5, but the side wall 12a of the reinforce 12 whose outer side is made of aluminum is displaced inward as shown by the arrow in FIG. As a result, the outward deformation of the outer wall of the bracket 11 can be prevented. Further, when the outer wall of the bracket 11 is going to be deformed inward at a low temperature, the deformation of the bracket 11 is prevented by the side wall of the reinforce 12 which is going to be displaced outward, contrary to the above.

[0020]

As described above, according to the first aspect of the present invention, since the steel fastener can be fixed to the aluminum plate by interposing the base plate, rivets and riveting can be achieved. This eliminates the need for drilling holes, thereby reducing costs.

According to the second aspect of the present invention, in addition to the effect of the first aspect, for example, when the side member is exposed to a high temperature, the deformation of the bracket which tends to bend outwardly is suppressed by the side wall. Has the effect that it can be prevented by the reinforce which is going to be displaced inward.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG. 1;

FIG. 3 is a perspective view of a second embodiment of the present invention.

FIG. 4 is a sectional view of a third embodiment of the present invention.

FIG. 5 is an operation explanatory view of FIG. 4;

FIG. 6 is a perspective view of a conventional technique.

FIG. 7 is a perspective view of another conventional technique.

[Explanation of symbols]

 5 Nut (fastener) 6 Base plate 7 Aluminum plate 10 Side member 11 Bracket 12 Reinforce 13 Spacer 14 Suspension bolt

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-2-209611 (JP, A) JP-A-6-123307 (JP, A) JP-A-63-45413 (JP, U) JP-A-6-45413 29530 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16B 37/04-37/06 B60G 7/02 B62D 27/00

Claims (2)

(57) [Claims] 1. An iron-clad base plate made of aluminum and iron rolled and polymerized by rolling, on the iron-side surface of the base plate.
A fastener fixing structure in which an iron fastener is welded, the aluminum side surface of the base plate is overlapped with an aluminum plate, and the base plate is welded and fixed to the aluminum plate. 2. A bracket made of aluminum and having a U-shaped cross section is fixed to both outer side surfaces of an aluminum side member used for a vehicle by welding both side edges thereof, and the bracket is formed along the inner side surface and the bottom surface of the bracket. A U-shaped cross section made of aluminum / iron clad material with aluminum on the outer side and iron on the inner side is superposed, and the reinforcement is welded to the bracket and the iron spacer is welded to the bottom of the reinforcement. A fastener fixing structure wherein an iron suspension bolt whose upper portion is supported by a bracket is supported by the spacer.