JP2016205487A - Washer and fastening structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washer with which when conductivity is imparted to a fastening structure having an insulation layer, fastening force is easy to be kept, and provide a fastening structure.SOLUTION: A washer 11 having conductivity includes a projection part 15 that penetrates an insulation layer 23 when an insulation part 21 having a conductive base part 22 and the insulation layer 23 laminated on the outer surface of the conductive base part is fastened by a fastening member 31. The washer 11 has a flat-plate like body part 13 having an open hole 12 and a main surface for receiving fastening force of the fastening member 31, and an outer peripheral part 14 provided integrally with the outer peripheral edge of the body part 13. The outer peripheral part 14 has the projection part 15. The projection part 15 is formed by a bending method.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a washer and a fastening structure using the washer.

  2. Description of the Related Art Conventionally, among washers, a washer having a protruding portion that penetrates an insulating layer when an insulating portion having a conductive base and an insulating layer laminated on the outer surface thereof is fastened by a fastening member is known (patent) Reference 1). Patent Document 1 discloses a configuration in which a sharp protrusion penetrating an insulating layer is provided on the main surface of a washer. By using such a washer, electrical conduction between the conductive base and the washer can be obtained.

Japanese Patent Laid-Open No. 11-336738

  In the conventional washer, after the washer and the insulating portion are fastened by the fastening member, an external force such as vibration is transmitted to the fastening portion, so that stress concentrates on the protrusion and the protrusion may be plastically deformed. Such plastic deformation of the protrusions causes a decrease in fastening force by the fastening member. As a result, it takes time to retighten the fastening member or replace the washer.

  This invention is made | formed in view of such a situation, The objective is to provide the washer and fastening structure which become easy to maintain fastening force, when providing electroconductivity to the fastening structure which has an insulating layer. is there.

  A washer that solves the above problem is a conductive washer having a projecting portion that penetrates the insulating layer when an insulating portion having a conductive base and an insulating layer laminated on the outer surface thereof is fastened by a fastening member. A flat plate-like main body having a through-hole and a main surface that receives a fastening force of the fastening member; and an outer peripheral portion integrally provided on an outer peripheral edge of the main body, the outer peripheral portion being While having the said protrusion part, the said protrusion part is formed by a bending process.

  According to this configuration, when the insulating portion is fastened by the fastening member, the conductive base portion and the washer are electrically connected by the protruding portion penetrating the insulating layer. At this time, since the shape of the main body portion having the main surface that receives the fastening force of the fastening member is a flat plate shape, the main body portion can be fastened so as to be in close contact with the insulating portion. Further, since the protruding portion is formed by bending, for example, even if the insulating portion is bent due to external force applied to the insulating portion, the protruding portion is elastically deformed so as to follow the conductive base of the insulating portion. It becomes possible. In addition, since the protruding portion is formed on the outer peripheral portion provided integrally with the outer peripheral edge of the main body portion, the elastic deformation of the protruding portion described above affects the main body portion that receives the fastening force of the fastening member. hard.

The said washer WHEREIN: It is preferable that the said protrusion part contains the some protrusion part which protrudes in the at least one main surface side among the main surfaces of the said main-body part.
According to this configuration, since there are a plurality of protrusions that can obtain electrical continuity with the conductive base, the reliability of the conductivity of the fastening structure is increased.

In the washer, it is preferable that the outer peripheral portion has a notch opening at an outer peripheral edge, and the protrusion includes a protrusion formed at a position adjacent to the notch.
According to this configuration, the inner side surface of the notch portion can be configured as one side surface of the protruding portion. For this reason, the shape of a protrusion part can be set using the shape of a notch part. For example, by changing the angle of the inner surface of the notch in a plan view of the washer, the shape of the portion extending from one side surface of the protruding portion to the other side surface of the protruding portion can be made relatively sharp. In addition, for example, the elasticity of the protrusion can be adjusted based on the setting of the shape of the protrusion. Thus, according to the said structure, according to the aspect of an insulation part, it becomes easy to set to a suitable protrusion part.

  In the washer, the projecting portion includes a first projecting portion projecting on the first main surface side of the main body portion, and a second projecting surface projecting on the second main surface side opposite to the first main surface. Part.

According to this configuration, even if the first main surface and the second main surface of the washer are oriented with respect to the insulating portion, electrical conduction with the conductive base can be obtained.
In the washer, the outer peripheral portion has a cutout portion that opens to an outer peripheral edge, and the protruding portion is formed by the first protruding portion and the second protruding portion that are formed adjacent to each other with the cutout portion interposed therebetween. It is preferable that a part is included.

According to this structure, it becomes easy to set any protrusion part of a 1st protrusion part and a 2nd protrusion part to a suitable protrusion part according to the aspect of an insulation part.
In the fastening structure using the washer, the insulating portion includes a first insulating portion and a second insulating portion disposed to overlap the first insulating portion, and the washer includes the first washer and the second washer. It is preferable that the first washer and the second washer have a structure including a washer so as to sandwich the first insulating portion and the second insulating portion.

  When the washer is disposed between the first insulating portion and the second insulating portion described above, a gap is easily generated around the washer between the first insulating portion and the second insulating portion. In the said fastening structure, a 1st insulating part and a 2nd insulating part can be arrange | positioned closer. Thereby, for example, it is easy to dispose the seal member between the first insulating portion and the second insulating portion, or to dispose the first insulating portion and the second insulating portion in close contact with each other. Therefore, it is advantageous as a fastening structure that requires a relatively high sealing property between the first insulating portion and the second insulating portion.

  According to the present invention, when imparting conductivity to a fastening structure having an insulating layer, the fastening force is easily maintained.

It is a disassembled perspective view which shows the fastening structure of this embodiment. It is a perspective view which shows a fastening structure. (A) And (b) is a perspective view which shows the washer of the example of a change.

  Hereinafter, an embodiment of a fastening structure using a washer will be described with reference to FIGS. 1 and 2. In the drawings, the thickness of the member may be exaggerated. First, an outline of the fastening structure will be described.

  As shown in FIGS. 1 and 2, the fastening structure using the washer 11 of the present embodiment is used when the insulating portion 21 is fastened with a fastening member 31. The insulating part 21 includes a first insulating part 21a and a second insulating part 21b arranged so as to overlap the first insulating part 21a. The 1st insulating part 21a and the 2nd insulating part 21b have the electroconductive base 22, and the insulating layer 23 laminated | stacked on the outer surface. The conductive base 22 is made of, for example, a metal material, and the insulating layer 23 is made of, for example, an insulating coating (coating film). Examples of the member having the first insulating portion 21a and the member having the second insulating portion 21b include a constituent member of a case in which an electric device such as a gas insulated switchgear is accommodated.

  In the fastening structure of the present embodiment, a pair of conductive washers 11 (a first washer 11a and a second washer 11b) are used. The fastening structure has a structure in which the first washer 11a and the second washer 11b sandwich the first insulating portion 21a and the second insulating portion 21b. As the fastening member 31, a bolt 31a and a nut 31b are used. The bolt 31a is inserted in order of the through hole 12 of the first washer 11a, the through hole 24 of the first insulating portion 21a, the through hole 24 of the second insulating portion 21b, and the through hole 12 of the second washer 11b. Screwed onto the nut 31b. In addition, although the spring washer 31c is interposed between the 2nd washer 11b and the nut 31b, this spring washer 31c can also be abbreviate | omitted.

Next, details of the washer 11 will be described.
The washer 11 has a main body 13 having a through hole 12 and a main surface that receives the fastening force of the fastening member 31, and an outer peripheral part 14 provided integrally with the outer peripheral edge of the main body 13. The shape of the main body portion 13 is a flat plate shape, and the main surface of the main body portion 13 of the first washer 11a receives the fastening force of the bolt 31a by contacting the head of the bolt 31a, and the second washer 11b The main surface of the main body 13 receives a fastening force of the nut 31b via a spring washer.

  Below, the main surface arrange | positioned in the washer 11 so that it may overlap with the insulation part 21 (insulating layer 23) is made into the 1st main surface, and the main surface on the opposite side to the 1st main surface is demonstrated as a 2nd main surface. . That is, the second main surface of the first washer 11a is disposed on the head side of the bolt 31a, and the second main surface of the second washer 11b is disposed on the nut 31b side.

  The outer peripheral portion 14 of the washer 11 has a protruding portion 15 that penetrates the insulating layer 23 when the insulating portion 21 is fastened by the fastening member 31. The outer peripheral part 14 of this embodiment has the some 1st protrusion part 15a which protrudes in the 1st main surface side, and the some 2nd protrusion part 15b which protrudes in the 2nd main surface side. More specifically, the outer peripheral portion 14 has a pair of first projecting portions 15 a that face each other with the main body portion 13 interposed therebetween, and a pair of second projecting portions 15 b that face each other with the body portion 13 sandwiched therebetween. Each protrusion 15 is formed by bending.

Next, the details of each protrusion 15 and its periphery will be described.
The outer peripheral portion 14 of the washer 11 has a pair of cutout portions 16 that open to the outer peripheral edge. The pair of cutout portions 16 are formed at positions facing each other with the main body portion 13 interposed therebetween. Each protrusion 15 described above is formed at a position adjacent to the notch 16. The first projecting portion 15a and the second projecting portion 15b are formed at positions adjacent to each other with the notch portion 16 interposed therebetween. The outer peripheral portion 14 configured in this manner has an outer edge shape (outer peripheral end surface 14 a) having an arc shape, and has a flat plate-like portion that does not have the notch portion 16. The flat plate portion has a main surface that continues to the main body portion 13.

  As shown in an enlarged view in FIG. 1, the cutout portion 16 has an inner bottom surface 16 a and an inner side surface 16 b extending from the inner bottom surface 16 a toward the outer peripheral end surface 14 a of the outer peripheral portion 14. One side surface of each protruding portion 15 is formed by the inner side surface 16 b of the notch portion 16, and the other side surface of each protruding portion 15 is formed by the outer peripheral end surface 14 a of the outer peripheral portion 14.

The configuration of the side surface of the first projecting portion 15a of the first washer 11a is set based on the rotation direction R of the bolt 31a when the bolt 31a is tightened as described below.
As shown in FIG. 1, when the first protrusion 15a of the first washer 11a is viewed from the second main surface side, the notch 16 is positioned on the rotation direction R side of the bolt 31a when the bolt 31a is tightened. Yes. In other words, one side surface of the first projecting portion 15 a is formed by the inner side surface 16 b of the notch portion 16. One side surface of the first projecting portion 15a is positioned on the leading side in the rotational direction R with respect to the other side surface of the first projecting portion 15a when a force is applied to rotate the first washer 11a in the rotational direction R. It is formed so that it may become the surface to do. The first projecting portion 15a of the second washer 11b also has one side surface located on the leading side in the rotational direction when the nut 31b is tightened. As described above, the second washer 11a and the second washer 11b of the second washer 11b are adjacent to the first projecting portion 15a with the notch 16 interposed therebetween, so the first washer 11a and the second washer. When the second main surface of 11b is arranged so as to overlap the insulating portion 21, the positional relationship is the same as that of the first projecting portion 15a.

  The washer 11 can be manufactured by first bending a metal plate material such as a steel plate by punching or laser processing and then bending the outer peripheral portion 14. Note that punching and bending may be performed simultaneously.

  Each protrusion 15 of the washer 11 is formed by bending a part of the outer peripheral edge of a metal plate having a circular outer shape. The outer peripheral portion 14 of the washer 11 formed in this way has a flat plate-like portion that extends outward from the protruding portion 15 in a plan view of the washer 11.

  The bending angle (outside angle) can be set in consideration of the elasticity required for the protrusion 15. The protruding portion 15 is preferably bent so as to have an angle of 5 ° or more with respect to the main surface of the main body portion 13, and more preferably bent so as to be 10 ° or more. Further, the protrusion 15 is preferably bent so as to have an angle of less than 90 ° with respect to the main surface of the main body 13, and is bent so as to have an angle of less than 85 °. More preferred.

Next, main actions of the washer 11 will be described.
As shown in FIG. 1, in order to fasten the first insulating part 21a and the second insulating part 21b, the first washer 11a and the second washer 11b are sandwiched between the first insulating part 21a and the second insulating part 21b. It arrange | positions and the 1st insulating part 21a and the 2nd insulating part 21b are fastened using the fastening member 31. FIG. In this way, when the insulating portion 21 is fastened by the fastening member 31, electrical conduction between the conductive base portion 22 and the washer 11 is obtained because the protruding portion 15 penetrates the insulating layer 23. At this time, since the shape of the main body portion 13 having the main surface that receives the fastening force of the fastening member 31 is a flat plate shape, the main body portion 13 can be fastened so as to be in close contact with the insulating portion 21. Further, since the protruding portion 15 is formed by bending, for example, even if the insulating portion 21 is bent due to an external force applied to the insulating portion 21, the protruding portion 15 follows the conductive base portion 22 of the insulating portion 21. Thus, it becomes possible to elastically deform. Further, since the protruding portion 15 is formed on the outer peripheral portion 14 provided integrally with the outer peripheral edge of the main body portion 13, the elastic deformation of the protruding portion 15 described above receives the fastening force of the fastening member 31. It is difficult to affect

Next, characteristic effects of the present embodiment will be described.
(1) The washer 11 includes a protruding portion 15 that penetrates the insulating layer 23 when the insulating portion 21 having the conductive base portion 22 and the insulating layer 23 laminated on the outer surface thereof is fastened by the fastening member 31. The washer 11 has a flat plate-like main body portion 13 having a through hole 12 and a main surface that receives the fastening force of the fastening member 31, and an outer peripheral portion 14 provided integrally with the outer peripheral edge of the main body portion 13. Yes. While such an outer peripheral part 14 has the protrusion part 15, the protrusion part 15 is formed by the bending process. According to this configuration, since the above-described action is obtained, it is easy to maintain the fastening force when imparting conductivity to the fastening structure having the insulating layer 23.

  (2) The protrusion 15 of the washer 11 includes a plurality of protrusions 15 (first protrusions 15 a) that protrude on at least one main surface (first main surface) side of the main surface of the main body 13. It is out. In this case, the presence of a plurality of protrusions 15 capable of obtaining electrical continuity with the conductive base 22 increases the reliability of the fastening structure with respect to conductivity.

  (3) The outer peripheral portion 14 of the washer 11 has a notch 16 that opens to the outer peripheral edge, and the protruding portion 15 of the washer 11 is formed at a position adjacent to the notch 16. In this case, the inner side surface 16 b of the notch portion 16 can be configured as one side surface of the protruding portion 15. For this reason, the shape of the protrusion 15 can be set using the shape of the notch 16. For example, by changing the angle of the inner surface 16b of the notch 16 in plan view of the washer 11, the shape of the portion extending from one side surface of the projecting portion 15 to the other side surface of the projecting portion 15 is made relatively sharp. You can also. Further, for example, the elasticity of the protrusion 15 can be adjusted based on the setting of the shape of the protrusion 15. Thus, according to the said structure, according to the aspect of the insulation part 21, it becomes easy to set to the suitable protrusion part 15. FIG.

  (4) The projecting portion 15 of the washer 11 has a first projecting portion 15a projecting on the first main surface side of the main body portion 13 and a second projecting surface side projecting on the second main surface side opposite to the first main surface. 2 protrusions 15b. In this case, even if the first main surface and the second main surface of the washer 11 are oriented with respect to the insulating portion 21, electrical conduction with the conductive base portion 22 can be obtained. Therefore, it is easy to smoothly perform the fastening operation.

  (5) The outer peripheral portion 14 of the washer 11 has a cutout portion 16 that opens to the outer peripheral edge, and the protrusion portion 15 includes a first protrusion portion 15a and a first protrusion portion 15a that are formed adjacent to each other with the cutout portion 16 in between. 2 protrusions 15b are included. In this case, it is easy to set any one of the first projecting portion 15 a and the second projecting portion 15 b as a suitable projecting portion 15 according to the mode of the insulating portion 21.

  (6) Only one side surface of both side surfaces of the projecting portion 15 of the washer 11 is formed by the inner surface 16b of the notch portion 16, and the one side surface is a rotation direction (for example, rotation direction R) for fastening the fastening member 31. It is formed so that it may become the surface located in the head side. In this case, since the force that causes the tip portion of the protruding portion 15 to bite into the insulating layer 23 of the insulating portion 21 is easy to work, the protruding portion 15 can be easily penetrated into the insulating layer 23 when fastened by the fastening member 31. It becomes possible. Further, since the tip portion of the protruding portion 15 is not easily caught by the insulating layer 23 when the fastening member 31 is loosened and removed, the insulating layer 23 is hardly damaged. In the insulating part 21 thus fastened and removed, the generation of scratches on the insulating layer 23 can be suppressed, which is advantageous when a member having the insulating part 21 is reused.

  (7) In the insulating layer 23 of the insulating portion 21 that has been fastened and removed from the washer 11, a trace through which the protruding portion 15 of the washer 11 has penetrated is visually recognized. In this regard, the outer peripheral portion 14 of the washer 11 of the present embodiment has a flat plate-like portion extending outward from the protruding portion 15 in a plan view of the washer 11. According to this configuration, when the member having the insulating portion 21 is reused, it is possible to cover the trace of the insulating layer 23 with the outer peripheral portion 14 of the washer 11. Therefore, when the member having the insulating portion 21 is reused, the appearance of the fastening portion can be improved.

  (8) In the fastening structure using the washer 11, the insulating part 21 includes a first insulating part 21a and a second insulating part 21b arranged so as to overlap the first insulating part 21a. The washer 11 having a fastening structure includes a first washer 11a and a second washer 11b, and the first washer 11a and the second washer 11b sandwich the first insulating portion 21a and the second insulating portion 21b. Yes.

  Here, for example, when the washer 11 is disposed between the first insulating portion 21a and the second insulating portion 21b, there is a gap around the washer 11 between the first insulating portion 21a and the second insulating portion 21b. It is likely to occur. In this regard, in the above-described fastening structure, the first insulating portion 21a and the second insulating portion 21b can be arranged closer to each other. Thereby, for example, a sealing member may be disposed between the first insulating portion 21a and the second insulating portion 21b, or the first insulating portion 21a and the second insulating portion 21b may be disposed in close contact with each other. It becomes easy. Therefore, it is advantageous as a fastening structure that requires a relatively high sealing property between the first insulating portion 21a and the second insulating portion 21b.

In addition, you may change the said embodiment as follows.
-As shown to Fig.3 (a), the number of the notch parts 16 of the said washer 11 may be single. Moreover, it can also change into the washer 11 which has three or more notch parts 16. FIG. Note that the washer 11 in FIGS. 3A and 3B represents the back side of the paper as the first main surface and the front side of the paper as the second main surface.

  -As shown to Fig.3 (a), the number of the said 1st protrusion parts 15a is not specifically limited, It can also change into 1 or 3 or more. Also about the number of the 2nd protrusion parts 15b, it is not restricted to the same number as the 1st protrusion part 15a, It can also change into one or three or more.

  As shown in FIG. 3B, the pair of first protrusions 15a may be formed at positions adjacent to each other with the notch 16 interposed therebetween, and the pair of second protrusions 15b may be formed as the notch. You may form in the position which adjoins 16 on both sides.

-Although only one side surface is formed from the inner side surface 16b of the notch part 16 among the both sides | surfaces of the said protrusion part 15, you may form both side surfaces of the protrusion part 15 by a notch part.
The pair of cutout portions 16 are formed at positions facing each other with the main body portion 13 interposed therebetween, but the pair of cutout portions 16 may be formed at positions not facing each other. That is, the first protrusions 15 a and 15 a and the second protrusions 15 b and 15 b may be formed at positions that do not face each other with the main body part 13 interposed therebetween.

-You may abbreviate | omit the said 2nd protrusion part 15b.
-The notch 16 may be omitted.
-You may comprise the said outer peripheral part 14 only from the protrusion part 15. As shown in FIG.

The outer shape of the washer 11 is a circular shape, but can be changed to a polygonal shape such as a triangular shape or a quadrangular shape.
-It is not limited to the said fastening structure, For example, you may change to the fastening structure which has arrange | positioned the washer 11 between the 1st insulating part 21a and the 2nd insulating part 21b. Further, for example, the washer 11 can be applied to a fastening structure for fastening a terminal of a ground wire to the insulating portion 21. In this case, electrical conduction between the conductive base 22 and the ground wire can be obtained.

-The fastening member 31 is not limited to the bolt 31a and the nut 31b, For example, a rivet can also be used.
The insulating layer 23 is not limited to painting but may be an insulating layer formed by lining or coating, for example.

  DESCRIPTION OF SYMBOLS 11 ... Washer, 11a ... 1st washer, 11b ... 2nd washer, 12 ... Through-hole, 13 ... Main-body part, 14 ... Outer peripheral part, 15 ... Projection part, 15a ... 1st projection part, 15b ... 2nd projection part, DESCRIPTION OF SYMBOLS 16 ... Notch part, 21 ... Insulating part, 21a ... 1st insulating part, 21b ... 2nd insulating part, 22 ... Conductive base, 23 ... Insulating layer, 31 ... Fastening member.

Claims (6)

A washer having conductivity, comprising a protruding portion that penetrates the insulating layer when the insulating portion having the conductive base and the insulating layer laminated on the outer surface thereof is fastened by a fastening member,
A flat plate-shaped main body having a through hole and a main surface that receives the fastening force of the fastening member; and an outer peripheral portion integrally provided on the outer peripheral edge of the main body;
The washer characterized in that the outer peripheral portion has the protruding portion, and the protruding portion is formed by bending. The washer according to claim 1,
The washer comprising a plurality of projecting portions projecting on at least one of the main surfaces of the main body portion. The washer according to claim 1 or 2,
The outer peripheral portion has a notch that opens to the outer peripheral edge,
The washer characterized in that the protrusion includes a protrusion formed at a position adjacent to the notch. In the washer according to any one of claims 1 to 3,
The protruding portion is a first protruding portion that protrudes on the first main surface side of the main body portion, and
A washer comprising a second projecting portion projecting on the second main surface side opposite to the first main surface. The washer according to claim 4,
The outer peripheral portion has a notch that opens to the outer peripheral edge,
The washer including the first protrusion and the second protrusion formed at positions adjacent to each other with the notch interposed therebetween. A fastening structure using the washer according to any one of claims 1 to 5,
The insulating part includes a first insulating part and a second insulating part arranged to overlap the first insulating part,
The washer includes a first washer and a second washer,
A fastening structure, wherein the first washer and the second washer sandwich the first insulating part and the second insulating part.