JP5103359B2 - Manufacturing method for fastening structure of body parts - Google Patents

Description

The present invention relates to a method of manufacturing a fastening structure for a vehicle body part that fastens two component parts formed of different metals.

As a fastening structure for vehicle body parts, a structure in which a structural part made of an iron material and a structural part made of an aluminum material are fastened is known.
In this type of body part fastening structure, consideration has been given to preventing or delaying the occurrence of electrolytic corrosion caused by direct contact between dissimilar metals. Generally, a structural adhesive and SPR (Self Piercing Rivets) are used together, or a structural adhesive and bolting are used together.

  The purpose of applying the above structural adhesive may be to expect bonding strength, but the main purpose is to prevent or generate the occurrence of galvanic rust caused by direct contact between dissimilar metals (dissimilar materials) The time is delayed.

As a technique that can be used in such a fastening structure for vehicle body parts, one member is joined to the other member with a predetermined gap, and a structural adhesive is interposed between the one member and the other member. Is known (for example, see Patent Document 1).
Japanese Patent No. 3179187

  The fastening structure for vehicle body parts disclosed in Patent Document 1 includes a connecting member (one member) welded to a vehicle body floor, a dash panel (the other member) to which the connecting member is connected via a washer, and these connecting members. The bolt is made to pass through the washer and the dash panel, the nut is screwed into the bolt, and the structural adhesive (adhesive layer) is filled in the gap between the end of the connecting member and the dash panel. is there.

However, in the fastening structure of the vehicle body parts, there is a problem that the amount of the structural adhesive increases because the gap between the connecting member and the dash panel is secured by the washer.
Further, in the fastening structure of the vehicle body parts, since there is no coating film or film covering the connecting member, the dash panel, the washer, and the bolt as a whole, the generation of rust cannot be suppressed in a severe water environment.

In detail, in order to prevent the occurrence of galvanic rust, the coating quality of the structural adhesive must be reliable. In order to ensure the coating quality, mechanized work is desirable rather than manual work. Therefore, it is necessary to generate an investment amount associated therewith and to secure a space for arranging these facilities at an appropriate position on the production site.
Further, the cost increase due to the material cost of the structural adhesive and the operation cost for operating the application robot is not low.
Furthermore, in order to ensure the coating quality, careful attention is required, and the production man-hours (application position, application amount, camera check, visual check, etc.) in production may increase significantly.

In order for the structural adhesive to be reliably applied to the interface, it is necessary to apply a large amount and to protrude from the interface part, so a large material cost (structural adhesive cost) is also required. .
That is, in the state of structural adhesive application before joining, the amount of structural adhesive is very large, and after joining, the structure adhesive is surely interposed at the interface between iron and aluminum. Adhesive for use.

  The present invention eliminates the use of structural adhesives in the fastening structure of a vehicle body part that fastens two components formed of dissimilar metals, and prevents electrolytic corrosion even in severe water environments. It is an object of the present invention to provide a fastening structure for vehicle body parts that can suppress the occurrence of rust.

The invention according to claim 1 is a method for manufacturing a vehicle body part fastening structure in which one member formed of different materials and the other member are fastened with bolts, and one member is made of an iron material. The upper member of the pipe material and the damper bracket of the same iron material, and the other member is a damper housing of the aluminum material, and the caulking nut having a flange that provides a predetermined gap on the damper housing side is fixed to the upper member and the damper bracket. is, the flange surface to the damper housing of the caulking nut is fastened with a bolt, caulking nut, have a non-active surface to at least one member and the other member, the damper housing is fastened to the upper member, the damper housing A damper housing assembly is formed in which a damper bracket is fastened to The damper bracket of the damper housing assembly is welded to the front side frame made of iron material to assemble the body frame, and the electrodeposition coating is applied to the outer surface after fastening one member, the other member, the caulking nut and the bolt. Is formed .

In the invention which concerns on Claim 1, one member and the other member which were formed with different materials from which a mutually different material mutually fastens with a volt | bolt.
One member is an upper member made of steel pipe material and a damper bracket made of iron material, and the other member is a damper housing made of aluminum material. A predetermined gap is formed on the upper member and the damper bracket on the damper housing side. A caulking nut having a flange to be provided is fixed, a damper housing is fastened with a bolt to the flange surface of the caulking nut, and the caulking nut has an inert surface with respect to at least one member and the other member. The use of an adhesive can be eliminated, and the occurrence of rust can be suppressed by preventing electrolytic corrosion caused by contact between different metals.

In addition , since the electrodeposition coating film was formed on the outer surface of the one member, the other member, the caulking nut and the bolt after fastening, the electrolytic corrosion is prevented and the generation of rust is suppressed even in a severe water environment. be able to.

In addition , since the upper member of one member is a pipe material, for example, even if the one member is thin and the seating surface to be fastened is small and the nut cannot be attached to the inner surface from the opening of one end of the pipe, the caulking nut may be used. Can be easily mounted from the outside. Accordingly, a thin pipe can be used, and the weight of the vehicle body part can be reduced.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. “Front”, “Rear”, “Left”, “Right”, “Up”, “Down” follow the direction seen from the driver, Fr is the front side, Rr is the rear side, and CL is the center side of the vehicle width. Show.
FIG. 1 is a perspective view of a vehicle body frame that employs a vehicle body component coupling structure according to the present invention. FIG. 2 is a perspective view of the periphery of the damper housing shown in FIG. 1 as viewed from the vehicle width center side. 3 is an exploded perspective view around the damper housing shown in FIG. 1, and FIG. 4 is a perspective view showing a subassembly of the vehicle body frame shown in FIG.

  FIG. 1 shows a left front portion of a vehicle body frame (vehicle body) 10. The right front portion of the vehicle body frame 10 has the same configuration as the left front portion. The vehicle body frame 10 includes a front bulkhead 15 provided on the front surface of the vehicle body, a front side frame (side frame) 12 extending from the front bulkhead 15 to the rear of the vehicle body (only the left is shown; the same applies hereinafter), a front bulkhead. An upper member 13 extending rearward of the vehicle body from the upper part of the head 15, a lower member 14 extending obliquely rearward from the middle of the upper member 13, and a side sill (not shown) are raised from the rear end of the upper member 13 and the lower member 14. The front pillar support member 18 to which the rear end is connected, the front pillar 11 extending obliquely rearward from the top of the front pillar support member 18, the front side frame 12, the upper member 13 and the lower member 14 are attached to the front damper (not shown). Damper how to support Consisting of ring 22..

  The front bulkhead 15 is connected to a lower horizontal member 23 extending in the vehicle width direction in the lower portion of the vehicle body, an upper horizontal member 24 extending in the vehicle width direction in the upper portion of the vehicle body, and the upper and lower horizontal members 23, 24. The left vertical member 25 and the right vertical member (not shown). The upper horizontal member 24 includes extensions 29 and 29 (one not shown) on both sides.

  The front side frame 12 includes an extension 12a connected to a floor frame (not shown), a side frame lower 33 having a concave shape in cross section, a side frame upper 34 covering the side frame lower 33, and these side frames. The vehicle body side front bracket 31 and the vehicle body side rear bracket 32 are provided on the lower 33 and the side frame upper 34 and fasten the damper housing 22 side.

  The side frame lower 33, the side frame upper 34, the vehicle body side front bracket 31 and the vehicle body side rear bracket 32 of the front side frame 12 are formed of iron material (made of iron).

The vehicle body side front bracket 31 includes a first welding surface 35 provided along the vehicle body longitudinal direction, a second welding surface 36 formed by bending from the front end of the first welding surface 35 along the vehicle width direction, The third welding surface 37 is formed by bending from the second welding surface 36 along the front of the vehicle body.
The vehicle body side rear bracket 32 is a bracket formed on the vehicle body side front bracket 31 symmetrically in the front-rear direction with respect to the center portion of the damper housing 22.

The upper member 13 and the lower member 14 are square pipe members made of an iron material (made of iron), and the upper member 13 and the lower member 14 constitute a connecting member 21.
The upper member 13 is provided with caulking nuts 74 and 74 for fastening the damper housing 22, and the lower member 14 is provided with caulking nuts 74 for fastening the damper housing 22.

  The damper housing 22 is a member made of an aluminum material. The damper housing 22 is provided before and after the main body 41 for attaching a front damper (not shown) and the main body side flange 56 of the main body 41 before being fastened to the connecting member 21. An upper fastening portion 42 and a rear upper fastening portion 43; front and rear leg portions 44, 45 extending forward and backward of the main body portion 41; and a front side frame. A lower fastening portion 52 before fastening to the 12 side via the front damper bracket 46 and a lower fastening portion formed at the front end of the rear leg portion 45 and fastened to the front side frame 12 side via the rear damper bracket 47 Part 53.

The main body 41 is formed with an opening 54 facing a front damper (not shown) and a plurality of mounting holes 55 for attaching the front damper.
The front upper fastening portion 42 is a portion in which a through hole 57 through which the bolt 81 passes is formed in the front portion of the main body side flange 56 formed at the upper end of the main body portion 41, and a caulking nut 74 is attached to the upper member 13. And is fastened with a bolt 81.

  The rear upper fastening portion 43 is a portion in which through holes 58 and 59 through which the bolts 82 and 83 are passed are formed in the rear portion of the main body side flange 56 formed at the upper end of the main body portion 41, and the upper member 13 and the lower member 14 is fastened with bolts 82 and 83 via caulking nuts 74 and 74.

  The front damper bracket 46 is a crank-shaped plate member whose upper part is bolted to the damper housing 22 side and whose lower part is welded to the vehicle body side front bracket 31, and has first to third attachment surfaces 61 to 63. A caulking nut 74 is attached to each of the first to third attachment surfaces 61 to 63. The rear damper bracket 47 is a member having substantially the same configuration as the front damper bracket 46 and is a member symmetrical in the front-rear direction with respect to the center portion of the damper housing 22.

  The front lower fastening portion 52 is provided along the longitudinal direction of the vehicle body, and a first fastening surface 66 fastened to the first mounting surface 61 with a bolt 84 and the front end of the first fastening surface 66 in the vehicle width direction. A second fastening surface 67 that is bent along the second mounting surface 62 and fastened with a bolt 85, and is bent along the front of the vehicle body from the second fastening surface 67 and is bolted to the third mounting surface 63. The third fastening surface 68 is fastened at 86.

The first to third fastening surfaces 66 to 68 are provided with through holes 71 to 73 through which the bolts 84 to 86 pass.
The rear lower fastening portion 53 is a portion having substantially the same configuration as the front lower fastening portion 52, and is a portion symmetrical to the front lower fastening portion 52 in the front-rear direction with respect to the center portion of the damper housing 22, Fastened to the rear damper bracket 47 with bolts 87-89.

As shown in FIG. 4, in the vehicle body frame 10, a damper housing 22 is fastened to the connecting member 21, and front and rear damper brackets 46 and 47 are fastened to the damper housing 22. 50, and the front and rear damper brackets 46 and 47 of the damper housing assembly 50 are welded to the vehicle body side front bracket 31 and the vehicle body side rear bracket 32, respectively, and assembled in the state shown in FIG.

5 is a sectional view taken along line 5-5 in FIG. 4, FIG. 6 is a sectional view taken along line 6-6 in FIG. 4, FIG. 7 is an enlarged view of a portion 7 in FIG. FIG.
The fastening structure 20 for vehicle body parts is a structure around the upper fastening portion 42 in front of the damper housing 22, and includes a connecting member (one member) 21 formed of an iron material and a damper housing (the other member) formed of an aluminum material. 22), a caulking nut 74 that is caulked by the connecting member 21, and a bolt 81 that is screwed into the caulking nut 74 and fastens the damper housing 22 to the connecting member 21.

The caulking nut 74 is connected by a flange 75 that provides a predetermined gap between the connecting member 21 and the damper housing 22, or between the damper housing 22 and the front and rear damper brackets 46 and 47, and the lower surface of the flange 75. A caulking portion 76 that is caulked and fixed to the member 21 or the front / rear damper brackets 46 and 47 (see FIG. 3) and a bolt fitting portion 77 that fits the bolts 81 to 89 are formed.
The caulking nut 74 can be mounted (caulked) even if the seating surface in the closed section is narrow. That is, it can be used for thin pipe materials.

  Further, the caulking nut 74 is subjected to a gloss chromate (MFZn NiC) treatment of 5 to 10 μm on the surface, and an acrylic silicon coating (equivalent to Cosmer NC2100 manufactured by Kansai Paint Co., Ltd.) is applied on the treated surface subjected to the gloss chromate treatment. In addition, an inert film that prevents electrolytic corrosion and the like is formed.

Bolts 81 to 89 (see FIG. 3) are the same product, and a coating for preventing electric corrosion (equivalent to GEOMET 720PLUS treatment manufactured by CACRAL) is applied to the surface.
Further, as shown in FIG. 7, an electrodeposition coating film 78 is formed on the outer surface after fastening of the connecting member (one member) 21, the damper housing (other member) 22, the caulking nut 74, and the bolt 81. Is done. The electrodeposition coating 78 is also formed around the other bolts 82 to 89 at the same time.
Since the flange 75 is formed in the caulking nut 74, a predetermined gap S <b> 1 corresponding to the height of the flange 75 is formed between the connecting member 21 and the damper housing 22.

As shown in FIG. 8, the fastening structure 30 for vehicle body parts is a structure around the lower fastening portion 52 in front of the damper housing 22, and a first damper bracket (one member) 46 formed of an iron material. The mounting surface 61, the first fastening surface 66 of the damper housing (the other member) 22 formed of an aluminum material, the caulking nut 74 caulked to the first mounting surface 61 of the front damper bracket 46, and the caulking nut 74 And a bolt 84 that fastens the damper housing 22 to the front damper bracket 46, and has the same structure as the fastening structure 20 (see FIG. 5) of the vehicle body parts.
The fastening parts of the bolts 85 to 89 have the same structure as the fastening structure 30 for the vehicle body parts. Moreover, x mark shows a welding part.

That is, the damper housing (structural member; the other member) 22 made of an aluminum material and the connecting member (structural member; one member) 21 made of an iron material are not in direct contact with each other.
In addition, since the dissimilar metals (dissimilar materials) (aluminum material and iron material) are not in direct contact and the minimum gap S1 is provided, both members 21 and 22 are subjected to the electrodeposition coating film 78 in the chemical conversion step. You can turn on.

The damper housing (aluminum material member) 22 and the connecting member (iron material member) 21 have a direct interface with the plurality of caulking nuts 74, but prevent electric corrosion or the like which is an appropriate surface treatment on the caulking nut 74 side. Since the inert film is formed in advance, the problem of galvanic corrosion (rust) does not occur. As a result, rust prevention performance can be ensured, and rust prevention performance can be achieved without applying structural adhesives (structural adhesives or structural adhesives and dust sealers, etc.) that have a large cost burden and mass production management burden. Can be secured.
In addition, when used in an environment such as a room where the need for consideration of rust is low, electrodeposition coating is also unnecessary.

  That is, as shown in FIGS. 5 to 7, in the vehicle body component fastening structure 20, one member (connecting member) 21 and the other member (damper housing) 22 formed of different materials are used. Are fastened with bolts 81.

  A caulking nut 74 is fixed to one member 21, and the other member 22 is fastened to the surface of the flange 75 of the caulking nut 74 with a bolt 81, so that the flange 75 is interposed between the one member 21 and the other member 22. A gap S1 corresponding to the height can be formed. Further, since the caulking nut 74 has a surface that is inactive with respect to at least one member 21 and the other member 22, it is possible to eliminate the use of a structural adhesive and to prevent an electric power generated by contact between different metals. It can prevent the occurrence of rust by preventing food.

In the body part fastening structure 20, the electrodeposition coating 78 is formed on the outer surface of the one member (connecting member) 21, the other member (damper housing) 22, the caulking nut 74, and the bolt 81 after fastening. In addition, it is possible to prevent the occurrence of rust and prevent the occurrence of rust even in a severe water environment.

  In the vehicle body part fastening structure 20, one member (connecting member) 21 is a pipe material. For example, one member 21 is thin and the seating surface to be fastened is small, and a nut is formed from the opening at one end of the pipe to the inner surface. Even if it cannot mount | wear, if it is the crimping nut 74, it can mount | wear easily from an outer surface. Accordingly, a thin pipe can be used, and the weight of the vehicle body part can be reduced.

  In the fastening structure for vehicle body parts according to the present invention, as shown in FIG. 3, the damper housing 22 is formed of an aluminum material, and the aluminum material includes aluminum or an aluminum alloy.

  As shown in FIG. 7, the fastening structure of the vehicle body part according to the present invention is a combination of an iron material and an aluminum material, but the metal type is a combination of an iron material and an aluminum material. It is not limited to. For example, a combination of aluminum and magnesium is also conceivable. In addition, this structure is effective in any part of the vehicle body part (vehicle body member).

  The fastening structure for vehicle body parts according to the present invention is suitable for use in passenger cars such as sedans and wagons.

1 is a perspective view of a vehicle body frame that employs a vehicle body component coupling structure according to the present invention. FIG. 2 is a perspective view of the damper housing shown in FIG. 1 as viewed from the vehicle width center side. FIG. 2 is an exploded perspective view around a damper housing shown in FIG. 1. It is a perspective view which shows the subassembly of the vehicle body frame shown in FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG. FIG. 6 is a sectional view taken along line 6-6 of FIG. FIG. 7 is an enlarged view of part 7 of FIG. 5. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 4.

Explanation of symbols

  20, 30 ... Fastening structure for vehicle body parts, 21 ... One member (connection member), 22 ... The other member (damper housing), 61 ... One member (first mounting surface), 66 ... The other member (first Fastening surface), 74 ... caulking nut, 75 ... flange, 78 ... electrodeposition coating film, 81, 84 ... bolt.

Claims (1)

In the manufacturing method of the fastening structure of the vehicle body part in which one member formed of different materials different from each other and the other member are fastened with bolts,
The one member is an upper member of an iron pipe material and a damper bracket of the same iron material, and the other member is a damper housing of an aluminum material,
Wherein the upper member and the damper bracket, the damper stop nut having a flange housing side provided a predetermined clearance is fixed, the damper housing is fastened by the bolt to the flange surface of the caulking nut,
The caulking nut, have a inert surface to at least the one member and the other member,
The damper housing is fastened to the upper member, and a damper housing assembly in which the damper bracket is fastened to the damper housing is formed.
The damper bracket of the damper housing assembly is welded to the front side frame of iron material to assemble the body frame,
The one member, the other member, said stop nut and the outer surface after fastening of the bolt, the manufacturing method of the fastening structure body component, characterized in that the electrodeposition coating film is formed.

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