JP2003172318A - Joint structure for metal plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint structure jointed in such a manner that a surface having burr of a through hole projecting always comes outside and a surface of a metal plate and a surface of a part to be attached get close uniformly surface in a surface. <P>SOLUTION: A projection part 41 higher than projecting burrs in a same direction with burrs created at a circumference edge part of the through hole in pressing is formed on a metal plate 4, and an opposite side surface of the surface having the projection part 41 projecting from the same is gotten close to and is fastened with the part 1 to be fastened. When the metal plate 4 is being jointed in an opposite direction, it is easily recognized that the same is opposite since the projection part 41 gets into contact with the part 1 to be fastened and interfere with the same. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining structure for metal plates having through holes formed by press working. INDUSTRIAL APPLICABILITY The joint structure of the present invention is used as a joint structure between an oil pan cover and a bracket of an automobile.

[0002]

2. Description of the Related Art An oil pan of a vehicle is provided with a metal oil pan cover for the purpose of reducing noise from an engine and radiant sound generated from the oil pan. This oil pan cover is generally formed by pressing one steel plate, and is fixed to the surrounding vehicle body so as to cover the oil pan with a sound absorbing material such as urethane foam interposed.

Large parts such as an oil pan cover are formed to have a relatively small thickness for weight reduction. Therefore, if it is fixed to the vehicle body as it is, there is a problem that when vibration is applied, stress concentrates on the fixed portion, metal fatigue occurs, and cracks occur.

Therefore, a method is conceivable in which a thick metal bracket is fixed to the cover body by rivets or welding, and the cover body is fixed to the vehicle body through a mounting hole and a grommet formed in the bracket. However, in these cases, since the cover body and the rivet are in direct contact with each other, when vibration is applied, stress concentrates on the contact portion and the welded portion of the cover body and the rivet, and the cover body with a thin wall thickness May be damaged.

Therefore, conventionally, the cover body has a sandwich structure in which a thick bracket and a metal reinforcing plate are sandwiched, and the cover body can be integrally fixed by rivets through rivet holes provided in the three members. Has been done. By doing this, the cover body is fixed in close contact with the bracket and the reinforcing plate, so it is possible to prevent stress from concentrating on the cover body when vibration is applied, and to prevent cracks from occurring. can do.

However, since the rivet hole provided in each member is formed by press working, it is unavoidable that burrs are generated at the peripheral portion of the rivet hole on the surface opposite to the surface pressed by the press blade. Therefore, even if each member has a sandwich structure, if burrs intervene at the interface and interfere with each other, it becomes difficult for the surfaces to come into close contact with each other, and when vibration is applied, stress concentrates on the contact area between the cover body and the rivet. As a result, the thin cover body may be damaged.

In order to avoid this inconvenience, deburring work may be carried out, but there is a problem that the number of man-hours is large because it is a post-treatment process after press working. Therefore, after deburring only the rivet holes in the cover body,
It is preferable that the surfaces of the bracket and the reinforcing plate from which the burrs protrude are joined to the outside. In this way, the cover body is fixed in close contact with the bracket and the reinforcing plate in a face-to-face manner, and deburring only needs to be performed on the cover body with a thin wall thickness, so the increase in man-hours can be minimized. Can be suppressed.

However, since the burr generated in the rivet hole is generally low in height and inconspicuous, the bracket or the reinforcing plate may be reversed and fixed by the operator's carelessness. In such a case, the surface intimate contact between the cover body and the bracket or the reinforcing plate is impaired, and the above-mentioned problem occurs. Therefore, it is required to fix the bracket or the reinforcing plate in the correct direction. The brackets are generally fixed to the front and rear and to the left and right of the cover body, and since the front and rear are generally bilaterally symmetrical, they can be prevented from being attached in the opposite direction due to the shape effect. However, the reinforcing plate is a flat plate with a simple shape such as a quadrangle, and if anything, it is preferable that it can be shared by the left and right brackets. In that case, the effect of preventing it from being fastened in the opposite direction due to the shape effect Can't expect.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances and is fixed so that the surface on which burrs project is always the outside, and the surface of the metal plate and the mounted portion are fixed. It is an object of the present invention to provide a bonded structure that is in close contact with the surface uniformly and has excellent strength.

[0010]

The characteristic of the joining structure of the metal plate of the present invention for solving the above-mentioned problems is that a metal plate having a through hole formed by press working is covered by a fastening means using the through hole. The joining structure joined to the mounting portion, the metal plate is formed with a protrusion protruding in the same direction as the burr generated at the peripheral portion of the through-hole during press working and higher than the height of the burr. And the surface on the opposite side is closely attached to the attached portion.

It is desirable that the convex portion is formed by pressing at the same time when the through hole is formed. Further, it is preferable that the convex portion is formed at the center of the metal plate. The fastening means is preferably a rivet.

Further, the joint structure of the present invention is preferably applied to a portion to which vibration is applied, and the metal plate is a reinforcing plate, and it is desirable to reinforce the joint portion between the thin attached portion and the thick bracket. In this case, it is possible to prevent the reinforcing plate from being fixed in the opposite direction even if the reinforcing plate is symmetrical on the front and back sides.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION In the joining structure of the present invention, a convex portion protruding in the same direction as the burr generated at the peripheral portion of the through hole during press working and higher than the height of the burr is formed on the metal plate. Therefore, when trying to fix the metal plate with the convex portion facing the mounted portion, the convex portion first comes into contact with the mounted portion, and a large gap is generated between the metal plate and the mounted portion, so that the metal plate There is rattling, which makes it difficult to fasten with the fastening means. Therefore, it is easily recognized that they are in the opposite direction, and the metal plate is always fixed in the correct orientation by the correction before fixing, so the surface of the metal plate and the surface of the mounted part are in close contact with each other uniformly. . Therefore, even if the thickness of the metal plate or the attached portion is thin, it is possible to prevent the occurrence of cracks due to stress concentration.

The metal plate is not particularly limited, and examples thereof include brackets and reinforcing plates described in the prior art. Also, the attached portion is not particularly limited, and in addition to the oil pan cover described in the prior art, various automobile parts or their covers, car bodies, bridge parts, building parts, etc. are exemplified. The attached part is made of one plate. The shape may be a box shape or a block shape. Alternatively, a metal plate may be attached to an attached portion composed of a plurality of parts such as a sandwich structure. Further, generally, a plurality of through-holes are formed in the metal plate by press working, but may be one in some cases. The diameter and the height of the burr generated are not limited at all.

Examples of the fastening means using the through hole include a rivet, a bolt, and spot welding in which a positioning pin is erected in the through hole. The rivet is particularly preferable. This is because the burr bites into the head of the rivet during fastening, and thus it is possible to obtain the effect of preventing fastening failure due to lifting.

The shape of the convex portion, which is the greatest feature of the present invention, is not particularly limited as long as it protrudes in the same direction as the burr generated at the peripheral portion of the through hole and is higher than the height of the burr. For example, it may have a hemispherical shape, a conical shape, a pyramidal shape, or a ridge. In addition, holes or grooves penetrating the front and back may be formed in the convex portion, and in this case, the convex portion may have a frame shape, a ring shape, a rib shape, or the like. Since it is necessary for the metal plate to rattle when the protrusion is mistakenly brought into contact with the attached part, it is desirable that the protrusion make point contact or line contact with the attached part, and the tip is curved. It is preferable that

Since it is necessary that the metal plate is loosened when the protrusions are erroneously aligned so as to abut the attached portion, the smaller the number, the more preferable it is. is there. Further, if the convex portion is in the vicinity of the through hole, it is easy to recognize rattling when first trying to fix it through the through hole. In addition, when a plurality of through holes are formed, it is preferable to form a convex portion at a position of an intersection of lines diagonally connecting the respective through holes, and a plurality of through holes are generally formed symmetrically. In this case, it is preferable to form it in the center of the metal plate. By doing this, it is easy to recognize the looseness of the metal plate regardless of which through hole is attached first,
It can be securely prevented from being attached in the opposite direction.

The convex portion may be separately formed and joined to the metal plate by welding or the like, but it is desirable to form the convex portion by pressing at the same time when the through hole is formed. As a result, it is possible to prevent an increase in man-hours, resulting in an inexpensive joint structure.

The joint structure of the present invention is preferably applied to a portion to which vibration is applied during use, such as a vehicle cover represented by an oil pan cover. Even if the stress due to vibration acts on the interface, the metal plate and the attached portion are in close contact with each other evenly, so that there is no backlash. Since the stress is prevented from concentrating on a specific portion, it is possible to prevent cracks and the like from occurring.

If the metal plate is a reinforcing plate that reinforces the joint portion between the thin attachment portion and the thick bracket, when the vibration is applied from the bracket attached to another member, the metal plate is attached to the fastening means. Concentration of stress acting on the mounting part can be suppressed,
It is possible to prevent the attached portion from being damaged. When the reinforcing plate is symmetrical on the front and back, it is prevented from being fixed in the opposite direction due to the presence of the convex portion, so that the burr-free surface of the reinforcing plate is surely opposed to the mounted member. Can be fastened.

In order to form the joint structure of the present invention, first, the metal plate and the mounting portion are overlapped with each other, and the through hole and the mounting hole of the mounting portion are communicated with each other. At this time, if the metal plate is in the reverse direction, the tip of the convex portion comes into contact with the surface of the mounted part and the metal plate is rattled. Can be recognized by the correction, and the metal plates are stacked in the correct direction by the correction. Then, for example, a fastening means such as a rivet is inserted into the through hole and the mounting hole for fastening, so that the surface of the metal plate opposite to the surface on which the convex portion protrudes is closely attached to the mounted portion.

[0022]

EXAMPLES The present invention will be specifically described below with reference to examples.

FIG. 1 shows an automobile oil pan cover having the joint structure of this embodiment. The oil pan cover includes a substantially container-shaped cover body 1, a pair of front brackets 2 fixed to the cover body 1, and a pair of rear brackets 3.

In this oil pan cover, a urethane foam layer is formed on the inner peripheral surface by integral molding, and the front bracket 2 and the rear bracket 3 are attached to the vehicle body via a grommet so that the urethane foam layer faces the oil pan. Mounted. The urethane foam layer can absorb the noise from the engine and the radiated sound from the oil pan, and also prevent the resonance of the cover body 1.

Since the cover body 1 is large, it must be lightweight, and is formed by press forming from a relatively thin steel plate having a thickness of 0.8 mm. As a whole, it has a two-stage container shape of a shallow bottom portion and a deep bottom portion, and a drain hole 10 for exposing an oil drain is formed in a part of the deep bottom portion covering the oil pan. Further, a flange 11 is formed on the peripheral portion thereof. Further, four rivet holes 12 are formed in the portions where the pair of front brackets 2 and the pair of rear brackets 3 are fixedly attached. The rivet hole 12 is deburred.

The front bracket 2 is made of a steel plate having a thickness of 2.9 mm and has an L-shaped cross section, and has a grommet hole 20 at one end.
Four rivet holes 21 are formed at the other end. The front bracket 2 has one end having a grommet hole 20 protruding outward from the cover body 1 and the other end having a rivet hole 21 closely contacting the outer surface of the cover body 1, and the inner surface of the cover body 1 respectively. It is fixed by rivets 5 together with the arranged front reinforcing plate 4.

The rear bracket 3 is made of a steel plate having a thickness of 2.9 mm and has an L-shaped cross section, and has a grommet hole 30 at one end.
However, four rivet holes (not shown) are formed at the other end. The rear bracket 3 has one end having a grommet hole 30 protruding outward from the cover body 1 and the other end having a rivet hole closely contacting the inner surface of the cover body 1, respectively. It is fixed by rivets 5 together with the rear reinforcing plate 6 arranged.

The pair of front brackets 2 and the pair of rear brackets 3 are symmetrical with each other, and one end portions thereof having the grommet holes 20 and 30 are fixed so as to project outward from the cover body 1. . Therefore, of both surfaces of the other end portion having the rivet hole, the surface to be brought into contact with the cover main body 1 is uniquely determined. Therefore, by pressing from the surface side to form the rivet hole, the surface of the cover main body 1 is abutted. The presence of burrs on the contacting surfaces is avoided.

As shown in FIG. 2, the front reinforcing plate 4 has a rectangular shape, and rivet holes 40 are formed at the four corners thereof.
One protrusion 41 is formed at the center. The four rivet holes 40 and the protrusions 41 are formed by a single press working,
A burr 42 is formed on the peripheral edge of the rivet hole 40 on the surface on the side where the protrusion 41 projects. And a pair of front reinforcing plates 4
Are fixed to the inner surface of the cover body 1 so that the protrusions 41 project inward and face each other.

Although not shown in detail, the rear side reinforcing plate 6 is similar to the front side reinforcing plate 4 except that it has a parallelogram shape, and rivet holes are formed at the four corners of the front side reinforcing plate 4, respectively. Individual projections are formed. The four rivet holes and the protrusions are formed by a single press working, and burrs are formed on the peripheral edge of the rivet holes on the surface where the protrusions protrude. The pair of rear reinforcing plates 6 are provided on the cover body 1
The projections are fixed to the outer surface of the so as to project outward from each other.

In the joining structure of this embodiment, there is no burr at the joining interface, and the front bracket 2 and the front reinforcing plate 4 both come into close contact with the cover body 1 uniformly, and the rear bracket 3
The rear reinforcing plate 6 and the rear reinforcing plate 6 are also fixedly attached to the cover body 1 in a uniform and intimate contact. Therefore, even if vibration is applied to the front bracket 2 and the rear bracket 3 while mounted on the vehicle body, the stress is prevented from being concentrated around the rivet hole 12 of the cover body 1, and the cover body 1 is cracked. It is possible to reliably prevent the occurrence of the problem.

Next, a method of fixing the front bracket 2 to the cover body 1 in the oil pan cover will be described with reference to FIGS.
This will be described with reference to (a cross-sectional view corresponding to the line AA in FIG. 1). The method of fastening the rear bracket 3 is the same as this, except that the positional relationship is different, and will therefore be omitted.

First, as shown in FIG. 3, the front bracket 2 is brought into contact with the outer surface of the cover body 1 and the front reinforcing plate 4 is brought into contact with the inner surface thereof so that the rivet holes 12, 21, 40 communicate with each other. In this way, the rivet 5 is inserted into the rivet holes 12, 21, and 40 by temporarily temporarily fixing it with the clamp. Front bracket 2
Is arranged so that one end having the grommet hole 20 projects outward from the cover body 1 and the other end having the rivet hole 40 is arranged on the outer surface of the cover body 1. It is never worn. However, the front reinforcement plate 4
Has a flat plate shape and has the same shape on the left and right sides, and therefore, there is a possibility that it will be fixed in the opposite direction.

At this time, if the front reinforcing plate 4 is oriented in the opposite direction, the projection 41 comes into contact with the surface of the cover body 1 as shown in FIG. Therefore, the front reinforcing plate 4 is not stable, and rattling occurs. Therefore, the operator can easily recognize that the front side reinforcing plate 4 has the opposite direction, and the worker can change the direction of the front side reinforcing plate 4 to be normal and temporarily fix it as shown in FIG. You can

The burr 42 existing in the rivet hole 41 is
Since it protrudes in the same direction as the protrusion 41,
The front reinforcing plate 4 is in surface-contact with the cover body 1 without the 42 facing the cover body 1 and interfering.
Further, there is no burr on the surface of the other end of the front bracket 2 having the rivet hole 40 that abuts the cover body 1, and the rivet hole 12 of the cover body 1 is deburred.
Therefore, the cover body 1 is in a state of being in close contact with the front bracket 2 and the front reinforcing plate 4 in a plane.

In that state, the rivet hole 40 of the front reinforcing plate 4
The tips of the rivets 5 protruding from the rivets 5 are pressed and crushed in order to obtain the state shown in FIG. As a result, the front bracket 2 is fixedly attached in a state where the cover body 1 is in close contact with the front bracket 2 and the front reinforcing plate 4 in a planar manner. Therefore, even if vibration is applied during use, it is possible to prevent the occurrence of cracks due to stress concentration around the rivet holes 12 of the cover body 1. Further, when the tip of the rivet 5 is crushed, the burr 42 bites into the rivet 5 and is integrated,
The effect of preventing improper fastening due to lifting can also be obtained.

In the above embodiment, the protrusion 41 of the front reinforcing plate 4 is used.
Is one dot, but a plurality of two or more may be formed. Further, as shown in FIG.
The same action and effect can be achieved even with 43. This ridge 43 can also be formed by pressing at the same time when the rivet hole 40 is formed, and an increase in man-hour can be prevented.

[0038]

According to the metal plate joining structure of the present invention, the surface of the metal plate and the surface of the mounted portion are uniform because the surface on which the burrs project is always fixed to the outside. It is possible to prevent stress from being concentrated due to vibration.

[Brief description of drawings]

FIG. 1 is a perspective view of an oil pan cover having a joint structure according to an embodiment of the present invention.

FIG. 2 is a perspective view of a reinforcing plate used in the joining structure according to the embodiment of the present invention.

FIG. 3 is an explanatory cross-sectional view of a state in which the joining structure according to the embodiment of the present invention is being formed.

FIG. 4 is an explanatory cross-sectional view of a state in which the reinforcing plates are arranged in reverse while the joint structure of the embodiment of the present invention is being formed.

FIG. 5 is a cross-sectional view of a joint structure according to an embodiment of the present invention,
FIG. 2 is a sectional view of a main part taken along the line AA of FIG. 1.

FIG. 6 is a perspective view showing another aspect of the reinforcing plate used in the joining structure of the embodiment of the present invention.

[Explanation of symbols]

1: Cover body (attached part) 2: Front bracket
3: Rear bracket 4: Front reinforcing plate (metal plate) 5: Rivets (fastening means)
6: Rear reinforcing plate 40: Rivet hole (through hole) 41: Protrusion (projection)
42: Bali

Claims (7)

[Claims] 1. A joining structure in which a metal plate having a through hole formed by press working is joined to a mounting portion by a fastening means using the through hole, the metal plate being pressed at the time of press working. A protrusion protruding in the same direction as the burr formed at the peripheral edge of the through hole and having a height higher than the height of the burr is formed, and the surface opposite to the surface on which the protrusion protrudes is closely attached to the mounted portion. The joining structure of the metal plates is characterized by being. 2. The joining structure for metal plates according to claim 1, wherein the convex portion is formed by pressing at the same time when the through hole is formed. 3. The metal plate joining structure according to claim 1, wherein the convex portion is formed at a center of the metal plate. 4. The fixing means is a rivet.
The joining structure of metal plates according to. 5. The method according to claim 1, which is applied to a portion to which vibration is applied.
The joining structure of metal plates according to. 6. The metal plate joint structure according to claim 5, wherein the metal plate is a reinforcing plate, and reinforces a joint between the thin attachment portion and the thick bracket. 7. The joining structure of metal plates according to claim 6, wherein the reinforcing plates are symmetrical on the front and back sides.