JPH0777213A - Fastener fixing structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a fastener fixing structure capable of fixing an iron nut or the like to an aluminum panel material at low cost. [Structure] An iron nut 5 is fixed by resistance welding to the iron side surface of a base plate 6 of an aluminum / iron clad material obtained by polymerizing aluminum and iron by rolling, and the base plate 6
The aluminum side surface of is superposed on the aluminum plate 7, and the base plate 6 is spot-welded to the aluminum plate 7.

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 may be welded and fixed to a panel material 1 of a vehicle body such as an automobile. A bolt insertion hole (not shown) is formed at a predetermined position of the iron panel material 1, an iron nut 2 is placed therein, and projections provided at several places around the ground surface side of the nut 2 are provided on the panel material 1. And the panel material 1 and the nut 2 are fixed by resistance welding.

[0003]

However, if the above-mentioned conventional fastener fixing structure is applied to the aluminum panel member 1 to which the aluminum nut 2 is fixed, the electric resistance value of the aluminum becomes iron. Since it is much smaller than the above, a high current (11 to 130,000 amperes) is required to weld the both, and there is a problem that the cost becomes high.

On the other hand, as shown in FIG. 7, an iron nut 2 is welded and fixed to an iron base plate 3 in advance, and the base plate 3 is fixed to an aluminum panel member 1 with rivets 4. Has been devised,
There is a problem in that hole processing for the rivet 4 and caulking of the rivet 4 are required, and the number of processing steps increases, leading to an increase in cost.

Therefore, the present invention provides 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 Problem] An iron-made fastener is welded to the iron-side surface of a base plate made of an aluminum / iron-clad material obtained by polymerizing aluminum and iron by rolling, and the aluminum-side surface of this base plate is made into an aluminum plate. After polymerization, the base plate was welded and fixed to the aluminum plate.

Further, aluminum brackets having a U-shaped cross section are welded and fixed to both outer surfaces of side members made of aluminum used in a vehicle along the inner and bottom surfaces of the brackets. The U-shaped cross-section reinforcement consisting of aluminum on the outer side and aluminum on the inner side and iron clad material is polymerized, the reinforcement is welded to the above bracket and the iron spacer is welded and fixed to the bottom of the reinforcement. Then, an iron suspension bolt having an upper portion supported by a bracket was supported by the spacer.

[0008]

According to the invention described in claim 1, the iron fastener can be fixed to the aluminum plate by interposing the base plate made of the aluminum / iron clad material. Further, according to the invention described in claim 2,
By interposing a reinforcement made of iron clad material, it is possible to fix an iron suspension bolt to an aluminum bracket fixed to an aluminum side member. Curvature deformation is prevented by a reinforcement force that 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 onto the base plate 6. The base plate 6 is made of aluminum and iron clad material obtained by polymerizing aluminum and iron by rolling. The nut 5 is the base plate 6
It is welded by resistance welding to the iron side surface. The surface of the base plate 6 on the aluminum side 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, the base plate 6 to which the nut 5 is attached and the corresponding aluminum plate 7
A through hole 8 for a bolt (not shown) is formed in the.

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 the vehicle body made of an aluminum body.

Further, when the base plate 6 is spot-welded to the aluminum plate 7, the electric resistance of the iron side surface of the base plate 6 is large, so that a spot-nagate between aluminum and aluminum can be used without using a spot welding gun for aluminum. Can be formed, and thus a spot welding gun for iron can be used.

Further, unlike the conventional case, rivets for attaching the base plate 6 and the aluminum plate 7 and drilling holes for the rivets are not required, and the number of parts and working man-hours can be reduced to reduce the cost.

Here, in the above embodiment, the nut 5 was explained as the fastener, but instead of this nut 5, FIG.
This fastening structure may be adopted for the bolt 9 as shown in FIG. Since the other structures and operations are similar to those of the first embodiment, the same parts are designated by the same reference numerals and the description thereof will be omitted.

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

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

The reinforcement 1 having a U-shaped cross section along the inner surface 11a and the bottom surface 11b of the bracket 11.
2 is polymerized and fixed by spot welding. The reinforcement 12 is made of aluminum / iron clad material obtained by polymerizing aluminum and iron by rolling. The outer surface of the bracket 11 that is polymerized is made of aluminum and the inner surface is made of iron. An iron spacer 13 is fixed to the bottom surface 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, an aluminum retainer 15 is joined by spot welding between the both side walls of the bracket 11, the screw portion 14a at the upper portion of the suspension bolt 14 is inserted into the retainer 15, and the screw nut 14a is made by the iron nut 16. Are fastened and fixed to the retainer 15.

According to the structure of the above embodiment, by using the reinforcement 12 made of aluminum / iron clad material, the iron suspension bolt 14 can be supported by the aluminum bracket 11 via the iron spacer 13. . Therefore, the suspension bolt 14 used for the iron side member can be used as it is even for the vehicle including the aluminum side member 10.

Further, when the side member 10 is exposed to a high temperature such as during baking of the vehicle body, aluminum has a coefficient of linear expansion about twice that of iron, so the suspension bolt 14 regulates the vertical direction. The outer wall of the bracket 11 is bulged and deformed outward as shown by a broken line in FIG. 5, but the side wall 12a of the reinforcement 12 made of aluminum is displaced inward as shown by an arrow in FIG. Therefore, the outward deformation of the outer wall of the bracket 11 can be stopped. Further, when the outer wall of the bracket 11 tends to be deformed inward at low temperature, the deformation of the bracket 11 is prevented by the side wall of the reinforcement 12 which is displaced outward, contrary to the above.

[0020]

As described above, according to the invention described in claim 1, the iron fastener can be fixed to the aluminum plate by interposing the base plate. Therefore, it is possible to reduce the cost because it is not necessary to drill holes.

According to the invention described in claim 2, in addition to the effect of claim 1, when the side member is exposed to a high temperature, for example, the deformation of the bracket which tends to bend outward is prevented from occurring. Has the effect of being able to be blocked by the reinforcement force that tends to displace inward.

[Brief description of 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 of FIG.

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.

5 is an explanatory view of the operation of FIG.

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

FIG. 7 is a perspective view of another prior art.

[Explanation of symbols]

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

Claims (2)

[Claims] 1. An iron-side surface of a base plate made of an aluminum / iron clad material obtained by polymerizing aluminum and iron by rolling,
A fastener fixing structure characterized in that an iron fastener is welded, the aluminum side surface of the base plate is superposed on the 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 welded and fixed to both outer surfaces of an aluminum side member used for a vehicle along both inner and bottom surfaces of the bracket. The U-shaped cross-section reinforcement consisting of aluminum on the outer side and aluminum on the inner side and iron clad material is polymerized, the reinforcement is welded to the above bracket and the iron spacer is welded and fixed to the bottom of the reinforcement. The fastener fixing structure is characterized in that an iron suspension bolt whose upper portion is supported by a bracket is supported by the spacer.