JP2014139900A - Ground connection structure for resin molding and method therefor, and conductive section used in the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate electrical connection of resin molding in which the surface layer portion shows electrical insulation and the inside shows conductivity, to the ground.SOLUTION: When a side sill garnish 10 (resin molding) is connected to a side panel 12, a washer 28 with a claw formed of a conductor is interposed between a connection bolt 18 and the side sill garnish 10. When the connection bolt 18 is screwed to a nut 26 arranged on the back face of the side panel 12, a claw portion 32 of the washer 28 with the claw is pierced from a surface layer portion 14 of the side sill garnish 10, and reaches an inside 16. The inside 16 of the side sill garnish 10 shows conductivity, and accordingly a conductive path is formed between the side sill garnish 10 and the washer 28 with the claw. Accordingly, the washer 28 with the claw, the connection bolt 18, the nut 26 or the side panel 12 is electrically connected to the ground, and thereby the side sill garnish 10 is set at a ground potential.

Description

  The present invention relates to a ground connection structure and method for a resin molded product that performs ground connection to a resin molded product in which a surface layer portion exhibits electrical insulation and the inside exhibits conductivity, and a conductive portion used therefor.

  The automobile body is configured by combining a metal molded product made of a metal such as a side panel and a member made of a resin molded product such as a side sill garnish. Here, if the metal molded product and the resin molded product are individually coated, even if they are the same color, a slight color difference may occur, which may impair the aesthetic appearance. In order to avoid this inconvenience, it has been proposed to obtain an assembly by combining a metal molded product and a resin molded product, and then paint the assembly (see, for example, Patent Document 1).

  As a coating method for the assembly, electrostatic coating is employed. That is, this is a technique in which a negatively charged atomized paint is generally sprayed on an assembly connected to the ground, and the atomized paint is applied to the assembly based on a potential difference between the two.

  By the way, when the resin molded product is made of a resin exhibiting electrical insulation, the resin molded product cannot be set to the ground potential. Therefore, since a potential difference cannot be generated between the resin molded product and the paint powder, it is difficult to efficiently coat the resin molded product.

  Therefore, in the technique described in Patent Document 1, a conductive primer is applied to a resin molded product. Recently, it has also been proposed to use a resin molded product obtained from a resin exhibiting conductivity by dispersing a conductive material such as carbon black.

  However, although this resin molded product shows electrical conductivity inside, the surface layer portion shows electrical insulation. The reason for this is that, as described in Patent Document 2, during injection molding to obtain a resin molded product, the temperature of the portion that becomes the surface layer portion drops more rapidly than the portion that becomes the inside. That is, the portion that becomes the surface layer portion in the molten resin is a portion that is in contact with the mold, but the portion is rapidly cooled by contacting the mold and is cured in a short time. For this reason, since the conductive material is restrained and unevenly distributed, a conductive network is not formed. On the other hand, the temperature decreasing rate inside, and hence the curing rate, is relatively slow, so that the conductive material is sufficiently dispersed to form a conductive network.

  Therefore, it is recalled that an earth terminal as proposed in Patent Document 3 is used. That is, a cutting blade is provided on the nut-like portion of the earth terminal. If the electrically insulating surface layer portion is cut by the cutting blade by rotating the earth terminal, the conductive interior is exposed. This is because it is considered that the resin molded product can be grounded by bringing the nut-like portion into contact with the exposed interior and further electrically connecting the ground terminal to the ground.

Japanese Patent Laid-Open No. 61-74682 JP 2004-34611 A JP 2010-49848 A

  When cutting a resin molded product with the cutting blade of the earth terminal described above, the cutting blade is also rotated because the earth terminal is rotating. For this reason, frictional heat is generated between the cutting blade and the resin molded product. This frictional heat raises the temperature in the vicinity of the cutting portion in the resin molded product, so that the vicinity of the cutting portion is softened. Thereafter, when the rotation of the cutting blade is finished and the cutting is finished, the vicinity of the cutting portion is rapidly cooled and hardened in a short time.

  Thus, the site | part rapidly hardened after once softening with cutting shows electrical insulation. This is because the conductive material is constrained in the same manner as the portion that comes into contact with the mold during injection molding and cannot be sufficiently dispersed, and a conductive network is hardly formed. Therefore, it is not easy to conduct the ground terminal and the resin molded product, and it is difficult to electrically connect the resin molded product to the ground.

  As described above, even if the surface layer portion is a resin molded product showing electrical insulation and the inside is conductive, it is difficult to set the ground potential. For this reason, for example, with respect to the resin molded product, It is not easy to apply the atomized paint efficiently.

  The present invention has been made to solve the above-described problems, and it is easy to set the resin molded product to the ground potential. For this reason, for example, a resin capable of improving the coating efficiency for the resin molded product. An object of the present invention is to provide a ground connection structure and method for a molded product, and a conductive portion used therefor.

In order to achieve the above object, the present invention provides a ground connection structure for a resin molded product that performs ground connection to a resin molded product in which a surface layer portion exhibits electrical insulation and the inside exhibits conductivity.
Puncture the puncture part provided in the conductive part made of a conductor from the surface layer part of the resin molded product,
The conducting portion that has reached the puncture portion inside the resin molded product is electrically connected to the ground.

Further, the present invention is a ground connection method for a resin molded product for performing a ground connection to a resin molded product whose surface layer portion shows electrical insulation and whose inside shows conductivity,
A step of puncturing a puncture portion provided in a conductive portion made of a conductor from a surface layer portion of the resin molded product;
Electrically connecting the conduction part, which the puncture part has reached inside the resin molded product, to the ground;
It is characterized by having.

  That is, in the present invention, the puncture portion and the resin molded product do not rotate until the puncture portion is punctured from the surface layer portion of the resin molded product and reaches the inside of the resin molded product. For this reason, generation | occurrence | production of frictional heat between a resin molded product and a conduction | electrical_connection part is avoided. As a result, the resin molded product is prevented from being softened and re-cured, and the formation of a portion exhibiting electrical insulation along with the re-curing is avoided. Thereby, the inside which the puncture part arrived at can be kept conductive.

  As can be understood from the above, in this case, a conductive path is formed by the inside of the resin molded product and the conductive portion where the puncture portion reaches the inside. Therefore, the resin molded product can be easily set to the ground potential by electrically connecting the conductive portion directly or indirectly to the ground.

  For example, when electrostatic coating is performed on such a resin molded product, the atomized paint is efficiently applied to the resin molded product. Since the resin molded product is at ground potential and the atomized paint is negatively or positively charged, a potential difference occurs between the resin molded product and the atomized paint, and as a result, electrostatic attraction acts on both. Because. For this reason, it becomes possible to improve the coating efficiency with respect to the resin molded product.

  When an insertion hole for inserting the screwing member is formed in the resin molded product, a washer interposed between the resin molded product and the head of the screwing member passed through the insertion hole. Can be a conduction part. In this case, the puncture portion provided in the washer (conduction portion) is punctured into the resin molded product when the screwing member is inserted into the insertion hole. In addition, a screw and a volt | bolt are contained in the screwing member said in this invention.

  The screwing member may be a connecting screwing member for connecting the resin molded product and another member. In this case, the resin molded product can be easily set to the ground potential by performing a normal operation of connecting the resin molded product and another member with a connecting screw member.

  An insertion hole for inserting a connecting screw member for connecting the resin molded product and another member is formed in the resin molded product, and the other member is inserted for inserting the connecting screw member When it has a screwing member attachment part in which the hole was formed, you may make it make the said screwing member attachment part into a conduction | electrical_connection part. That is, the puncture portion may be provided in the screwing member mounting portion, and the puncture portion may be punctured into the resin molded product when the connecting screwing member is inserted into the insertion hole.

  In addition, as a suitable example of a resin molded product, the structural member of a motor vehicle body is mentioned. More specifically, it is a side sill garnish. In this case, a side panel is mentioned as a suitable example of another member.

Furthermore, the present invention is a conductive portion for performing ground connection to a resin molded product whose surface layer portion shows electrical insulation and whose inside shows conductivity,
It has a puncture part that is punctured from the surface layer part of the resin molded product,
The puncture portion is electrically connected to the ground in a state where the puncture portion reaches the inside of the resin molded product.

  By employing such a conductive portion, the above-described ground connection structure can be configured, and the ground connection method can be performed.

  As described above, the conducting portion can be constituted by a washer or a screwing member mounting portion.

  According to the present invention, when the puncture portion provided in the conductive portion made of a conductor is made to reach the inside by puncturing from the surface layer portion of the resin molded product, the conductive portion (puncture portion) and the resin molded product do not rotate. Thus, the portion where the puncture portion is punctured can be kept conductive inside. Therefore, the resin molded product can be easily set to the ground potential by electrically connecting the conducting portion reached by the puncture portion to the ground.

  For example, when electrostatic coating is performed on the resin molded product electrically connected to the ground as described above, an electrostatic attractive force effectively acts between the resin molded product and the atomized paint. For this reason, it becomes possible to improve the coating efficiency with respect to the resin molded product.

It is the principal part schematic perspective view before the connection which showed the side sill garnish which is a resin molded product, and the side panel (other member) which is a metal molded product as a viewpoint on the vehicle body rear side. It is principal part perspective explanatory drawing which shows the component of the earth connection structure which concerns on this Embodiment. It is principal part perspective explanatory drawing which shows the washer with a nail | claw (conducting part) in FIG. 2, and a connection bolt. It is a principal part schematic perspective view which shows the state which connected the side sill garnish and the side panel. It is a principal part longitudinal cross-sectional view which shows the state by which the earth connection structure which concerns on this Embodiment was comprised. It is principal part perspective explanatory drawing which shows the component of the ground connection structure which concerns on another embodiment.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the ground connection method according to the present invention will be described in detail with reference to the accompanying drawings, with reference to preferred embodiments in relation to the ground connection structure and conducting portion for carrying out the method.

  FIG. 1 is a schematic perspective view of a main part before connection, showing a side sill garnish 10 as a resin molded product and a side panel 12 (another member) as a metal molded product as viewed from the rear side of the vehicle body. In the present embodiment, the side sill garnish 10 and the side panel 12 are connected and the side sill garnish 10 is connected to the ground.

  The side sill garnish 10 is an injection-molded product obtained by injection molding a molten resin to which a conductive material such as carbon black is added. For the reasons described above, the surface layer portion 14 (see FIG. 5) of the side sill garnish 10 exhibits electrical insulation, and the interior 16 exhibits conductivity. As shown in FIGS. 1 and 2, the side sill garnish 10 has a first insertion hole 20 through which a connection bolt 18 (see FIG. 2), which is a connection screw member, is inserted, in other words, inserted. Is formed.

  The side panel 12 is a metal member produced by, for example, press molding or the like, and exhibits conductivity throughout. The side panel 12 is provided with a ground cable (not shown) in advance. Of course, this ground cable is electrically connected to the ground, so the side panel 12 is at ground potential.

  The side panel 12 is usually coated with an electrodeposition coating film formed by applying an undercoat. For this reason, when the side panel 12 does not exhibit electrical conductivity (when it exhibits electrical insulation), when the ground bolt having a cutting portion is screwed into an appropriate bolt hole or nut, the electric power is cut by the cutting portion. The surface which shows the electroconductivity of the side panel 12 is exposed by cutting a coating film. Thereby, a conductive path between the side panel 12 and the ground bolt can be provided.

  The side panel 12 is formed so that a bracket portion 22 (connection bolt attachment portion) for attaching the side sill garnish 10 protrudes. That is, the bracket portion 22 is formed with a second insertion hole 24 through which the connection bolt 18 is passed, and the nut 26 is screwed into the connection bolt 18 passed through the first insertion hole 20 and the second insertion hole 24. As a result, the side sill garnish 10 is connected to the side panel 12.

  Here, between the head of the connecting bolt 18 and the side sill garnish 10, a claw washer 28 (see FIG. 2) as a conducting portion is interposed. Of course, the claw washer 28 is made of a conductor such as metal.

  As shown in FIG. 2 and FIG. 3, in this case, the claw washer 28 has an annular portion 30 and four claw portions 32 (puncture portions) spaced apart from each other at substantially equal intervals. In other words, the annular portion 30 is formed with four cuts 34 extending from the outer peripheral wall to the inner peripheral wall and extending in a direction inclined with respect to the diameter direction. The nail | claw part 32 is provided by bending so that it may stand substantially perpendicularly from each of the notch | incision 34. FIG. Note that all the claw portions 32 extend in the same direction.

  The ground connection method according to the present embodiment is performed in the process of connecting the side panel 12 and the side sill garnish 10 via the connecting bolt 18, the claw washer 28 and the nut 26 configured as described above. Hereinafter, this earth connection method and the earth connection structure constituted thereby will be described.

  When connecting the side panel 12 and the side sill garnish 10, the first insertion hole 20 and the second insertion hole 24 are aligned. Further, as shown in FIG. 2, a claw washer 28 is disposed between the connecting bolt 18 and the side sill garnish 10 so that the claw portion 32 faces the side sill garnish 10, and a nut 26 is provided on the back of the side panel 12. Be placed.

  Next, after the connecting bolt 18 is passed (inserted) through the claw washer 28, the first insertion hole 20 and the second insertion hole 24, the connecting bolt 18 is rotated and screwed into the nut 26. Accordingly, as shown in FIG. 4, the side sill garnish 10 is connected to the side panel 12.

  In the process in which the connecting bolt 18 is screwed into the nut 26, the claw washer 28 is pressed by the head of the connecting bolt 18, and as a result, the four claw portions 32 are pushed into the side sill garnish 10. That is, as shown in FIG. 5, the claw portion 32 is punctured from the surface layer portion 14 of the side sill garnish 10 and reaches the inside 16. Further, the connecting bolt 18 contacts the claw washer 28 and the nut 26, and the nut 26 is seated on the side panel 12.

  Here, the claw washer 28 is a separate member from the connecting bolt 18 and does not rotate even when the connecting bolt 18 is rotated to be screwed onto the nut 26. Therefore, the nail | claw part 32 advances linearly, when the side sill garnish 10 is punctured. For this reason, generation of frictional heat between the claw washer 28 and the side sill garnish 10 is avoided, so that the vicinity of the first insertion hole 20 of the side sill garnish 10 is prevented from being softened.

  As a result, it is avoided that the vicinity of the first insertion hole 20 is re-cured and exhibits electrical insulation. That is, the interior 16 where the claw portion 32 has reached maintains the state of conductivity. Therefore, a conductive path is formed between the side sill garnish 10 and the ground cable via the inside 16 of the side panel 12, the claw washer 28, the connecting bolt 18, the nut 26, and the side panel 12. That is, the side sill garnish 10 and the ground are electrically connected, and thereby the ground connection structure 40 according to the present embodiment is configured.

  As can be understood from the above, according to the present embodiment, the side sill garnish 10 can be easily set to the ground potential only by performing a normal operation of connecting the side sill garnish 10 to the side panel 12.

  Moreover, since the claw portion 32 of the claw washer 28 enters the inside 16 of the side sill garnish 10, it is difficult to visually recognize it from the outside. Accordingly, the aesthetic appearance is not impaired by using the claw washer 28 at the connecting portion (ground connection structure 40) between the side sill garnish 10 and the side panel 12.

  After the side sill garnish 10 is set to the ground potential in this way, for example, electrostatic coating is performed. That is, after an assembly (car body) manufactured by attaching the side sill garnish 10 to the side panel 12 is loaded into the painting booth, for example, a negatively charged atomized paint is blown onto the assembly. Put on. Since the side panel 12 and the side sill garnish 10 are already at ground potential as described above, a potential difference is generated between the assembly and the atomized paint.

  Based on this potential difference, electrostatic attraction acts between the assembly and the atomized paint. For this reason, the atomized paint is attracted and applied to the assembly. Of course, the atomized paint is efficiently applied not only to the side panel 12 but also to the side sill garnish 10. This is because the side sill garnish 10 is at ground potential as described above, and a sufficient electrostatic attraction force acts between the negatively charged atomized paint. That is, by adopting the ground connection structure 40 according to the present embodiment, it is possible to improve the coating efficiency for the side sill garnish 10 without impairing the beauty of the side sill garnish 10.

  In this case, since the side sill garnish 10 is applied as an assembly, it is possible to avoid a color difference between the side sill garnish 10 and the side panel 12. Therefore, a painted automobile body excellent in aesthetics can be obtained.

  The present invention is not particularly limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

  For example, in this embodiment, the claw washer 28 is used as a conducting portion, but as shown in FIG. 6, it is directed toward the side sill garnish 10 in the vicinity of the opening of the second insertion hole 24 of the bracket portion 22. You may make it form the nail | claw part 42 (puncture part) which protruded. Even in this case, the claw portion 42 does not rotate when the connecting bolt 18 is screwed into the nut 26. Therefore, even after the claw portion 42 is punctured into the side sill garnish 10, the vicinity of the puncture portion maintains electrical conductivity. A general flat washer 44 may be interposed between the side sill garnish 10 and the connecting bolt 18.

  Moreover, you may make it electrically connect only a resin molded product to earth | ground, without attaching resin molded products, such as the side sill garnish 10, to another member. For this purpose, a nut 26 is disposed on the back side of the resin molded product, a washer 28 with a claw and a bolt are disposed on the main surface side of the resin molded product, and the bolt is screwed onto the nut 26. Thereby, the claw portion 32 of the claw washer 28 is punctured from the surface layer side of the resin molded product to enter the inside 16, and any one of the bolt, the claw washer 28 or the nut 26 and the ground may be electrically connected. .

  Similarly to the ground connection structure 40 shown in FIG. 1 to FIG. 5, instead of using a ground cable provided on the side panel 12, any one of the connecting bolt 18, the claw washer 28, and the nut 26 is connected to the ground. May be electrically connected.

  Furthermore, an internal thread part may be formed in the inner wall of the 1st insertion hole 20 thru | or the 2nd insertion hole 24, and a connection screw (connection threading member) may be screwed together in this internal thread part.

  Furthermore, the resin molded product is not limited to the side sill garnish 10, and other members are not limited to the side panel 12.

  The ground connection structure and method according to the present invention and the conducting portion used therefor are not employed only when performing electrostatic coating, and it is necessary to electrically connect the resin molded product to the ground. It is possible to adopt the case in general.

DESCRIPTION OF SYMBOLS 10 ... Side sill garnish 12 ... Side panel 14 ... Surface layer part 16 ... Inside 18 ... Connection bolt 20 ... 1st insertion hole 22 ... Bracket part 24 ... 2nd insertion hole 26 ... Nut 28 ... Washer with nail | claw 30 ... Ring part 32, 42 ... Claw 34 ... Cut 40 ... Ground connection structure

Claims (13)

A ground connection structure for a resin molded product that makes a ground connection to a resin molded product whose surface layer portion shows electrical insulation and whose inside shows conductivity,
Puncture the puncture part provided in the conductive part made of a conductor from the surface layer part of the resin molded product,
A ground connection structure for a resin molded product, wherein the conductive portion where the puncture portion has reached the interior of the resin molded product is electrically connected to the ground. The connection structure according to claim 1, wherein an insertion hole for inserting a screwing member into the resin molded product is formed,
The conducting portion is a washer interposed between the resin molded product and a head portion of the screwing member passed through the insertion hole,
The puncture portion is punctured into the resin molded product when the screwing member is inserted into the insertion hole.   3. The connection structure according to claim 2, wherein the screwing member is a connecting screwing member for connecting the resin molded product and another member. The connection structure according to claim 1, wherein an insertion hole for inserting a connecting screw member for connecting the resin molded product and another member is formed in the resin molded product,
The conducting portion is a screwing member mounting portion provided in the other member and having an insertion hole for inserting the connecting screwing member;
The puncture portion is punctured into the resin molded product when the connecting screw member is inserted into the insertion hole.   The connection structure according to any one of claims 1 to 4, wherein the resin molded product is a constituent member of an automobile body. A ground connection method for a resin molded product in which a surface layer portion exhibits electrical insulation and a ground connection is performed with respect to a resin molded product in which the inside exhibits conductivity,
A step of puncturing a puncture portion provided in a conductive portion made of a conductor from a surface layer portion of the resin molded product;
Electrically connecting the conduction part, which the puncture part has reached inside the resin molded product, to the ground;
A ground connection method for a resin molded product characterized by comprising: The connection method according to claim 6, wherein an insertion hole is formed as the resin molded product.
And the washer interposed between the resin molded product and the head of the screwing member inserted into the insertion hole is used as the conduction portion.
A ground connection method for a resin molded product, wherein the puncture portion is punctured into the resin molded product when the screwing member is inserted into the insertion hole.   The connection method according to claim 7, wherein a connecting screwing member for connecting the resin molded product and another member is used as the screwing member. The connection method according to claim 6, wherein the resin molded product is formed with an insertion hole into which a connecting screw member for connecting the resin molded product and another member is inserted.
And using the screwing member mounting portion provided in the other member and having an insertion hole for inserting the connecting screwing member as the conducting portion,
A method for ground connection to a resin molded product, wherein the puncture portion is punctured into the resin molded product when the connecting screw member is inserted into the insertion hole.   The connection method according to any one of claims 6 to 9, wherein the resin molded product is a constituent member of an automobile body. A conductive portion for ground connection to a resin molded product whose surface layer portion shows electrical insulation and whose inside shows conductivity,
It has a puncture part that is punctured from the surface layer part of the resin molded product,
A conduction part, wherein the puncture part is electrically connected to the ground in a state where the puncture part reaches the inside of the resin molded product. The conduction part according to claim 11, wherein the resin molded product has an insertion hole formed therein.
The conducting portion is a washer interposed between the resin molded product and a head portion of a screwing member inserted into the insertion hole. The conduction part according to claim 11, wherein the resin molded product is formed with an insertion hole for inserting a connecting screw member for connecting the resin molded product and another member,
The conduction portion is a screwing member mounting portion provided in the other member and having an insertion hole for inserting the connecting screwing member.

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