JP7262219B2 - Connection structure of conductor - Google Patents

Description

The present invention relates to a conductor connection structure .

2. Description of the Related Art Various types of electrical equipment employ a connection structure in which two conductors are electrically insulated from each other and connected by conductive screws.
Patent Literature 1 discloses a structure in which two conductors (mounting portions) are electrically insulated and connected by using a tubular collar and an insulating bush made of an insulating material. The insulating bushing has a tubular portion and an annular flange portion provided at one axial end of the tubular portion and projecting from the outer periphery of the tubular portion. In this structure, a collar is sandwiched between two conductors, the tubular portion of the insulating bush is inserted from one conductor side into one conductor and the collar in order, and then the screw is inserted into the insulating bush from one conductor side. The two conductors are connected by turning the screw and attaching the tip of the screw to the other conductor. When the two conductors are connected, the flange portion of the insulating bush is interposed between the head of the screw and one of the conductors. That is, the flange portion of the insulating bushing is intended to electrically insulate the head of the screw from one of the conductors.

JP 2015-015367 A

By the way, when the potential difference between two conductors is large, the insulation distance from the head of the screw to one of the conductors (especially the creepage distance from the head of the screw to one of the conductors along the surface of the flange) is required to be extended. In order to extend the insulation distance, for example, it is conceivable to increase the diameter of the flange portion of the insulation bushing. However, simply enlarging the diameter of the flange portion of the insulating bush raises the problem that the amount of insulating material required to manufacture the insulating bush increases. In addition, simply increasing the diameter of the flange portion of the insulating bush also poses a problem that miniaturization of electrical equipment including the insulating bush is hindered.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and provides a conductor connection structure that can extend the insulation distance from the screw head to the conductor while reducing the amount of insulating material required for manufacturing the insulating bush. intended to

One aspect of the present invention is a conductor connection structure for connecting two conductors with a gap from each other by means of a screw, which has electrical insulation and is arranged between the two conductors. a cylindrical collar, a cylindrical part having electrical insulation properties, which is inserted into the first conductor and the collar in order and allows the shaft part of the screw to pass through from the first conductor side; an insulating bushing integrally formed at a first end in the axial direction of the tubular portion located on the side of one conductor and having an annular flange portion projecting in the radial direction of the tubular portion from the outer periphery of the tubular portion; , wherein the flange portion includes an inner flange portion connected to the first end of the tubular portion and sandwiched between the screw head and the collar together with the first conductor; an outer flange portion projecting from the outer periphery in the radial direction and having a thickness in the axial direction of the tubular portion smaller than that of the inner flange portion , wherein the thickness of the outer flange portion in the axial direction is equal to that of the inner flange portion. It is a connection structure of conductors that becomes smaller as it is separated from the outer circumference in the radial direction .

Another aspect of the present invention is a conductor connection structure in which two conductors are connected to each other by a screw while being spaced from each other. a cylindrical collar having electrical insulation properties, a cylindrical part that is inserted in order into the first conductor and the collar and allows the shaft part of the screw to pass through from the first conductor side; Insulation having an annular flange portion integrally formed at a first axial end of the tubular portion positioned on the first conductor side and projecting in a radial direction of the tubular portion from an outer circumference of the tubular portion a bushing, wherein the flange portion is connected to the first end of the tubular portion and sandwiched between the screw head and the collar together with the first conductor; and the inner flange portion. an outer flange portion projecting in the radial direction from the outer circumference of the portion and having a thickness in the axial direction of the tubular portion smaller than that of the inner flange portion; The conductor connection structure includes an insulating plate disposed between one conductor and the flange portion and extending outward from the outer periphery of the flange portion in the radial direction.

ADVANTAGE OF THE INVENTION According to this invention, the insulation distance from the head of the screw which connects two conductors to a 1st conductor can be extended, suppressing the quantity of the insulation material required for manufacture of an insulation bush small.

1 is a cross-sectional view showing a conductor connection structure according to a first embodiment of the present invention; FIG. 1 is a perspective view showing an insulation bushing according to a first embodiment of the present invention; FIG. FIG. 2 is an exploded perspective view of the conductor connection structure shown in FIG. 1 ; FIG. 2 is a diagram showing the creepage distance from the head of a screw to the first conductor in the conductor connection structure shown in FIG. 1 ; FIG. 5 is a diagram showing a comparative example of the creepage distance from the head of the screw to the first conductor; FIG. 4 is a cross-sectional view showing a first example of a conductor connection structure according to a second embodiment of the present invention; FIG. 5 is a cross-sectional view showing a second example of a conductor connection structure according to a second embodiment of the present invention; FIG. 5 is a cross-sectional view showing a conductor connection structure according to a third embodiment of the present invention; FIG. 10 is a cross-sectional view showing a conductor connection structure according to a fourth embodiment of the present invention;

[First Embodiment]
A first embodiment of the present invention will be described below with reference to FIGS.
As shown in FIGS. 1 and 3, the conductor connection structure according to the present embodiment is included in various electric devices, and two conductors 1 and 2 are connected to each other by a screw 3 while being spaced apart from each other. It is a structure that connects.

Both the two conductors 1, 2 and the screw 3 are electrically conductive. The shape of each conductor 1, 2 may be arbitrary. In this embodiment, the two conductors 1 and 2 are both flat plate-shaped. A through hole 11 is formed in the first conductor 1 of the two conductors 1 and 2 . A shaft portion 31 of the screw 3 and a tubular portion 51 of an insulating bush 5 to be described later are inserted into the through hole 11 . The second conductor 2 is formed with a female screw hole 21 that meshes with the shaft portion 31 (male screw) of the screw 3 . The female screw hole 21 may pass through the second conductor 2 as shown in the drawing, but it does not have to pass through, for example.

The conductor connection structure includes a collar 4 and an insulating bush 5 . Both the collar 4 and the insulating bush 5 are electrically insulating. The collar 4 and the insulating bush 5 are made of resin material. The resin material may be, for example, polycarbonate or the like.

The collar 4 is cylindrically formed. The collar 4 is arranged between the two conductors 1 and 2 so that its axial direction faces the arrangement direction of the two conductors 1 and 2 (the vertical direction in FIGS. 1 and 3). A first axial end of the collar 4 contacts a peripheral region of the through hole 11 on the facing surface 12 of the first conductor 1 facing the second conductor 2 . On the other hand, the second axial end of the collar 4 contacts the peripheral area of the female screw hole 21 on the facing surface 22 of the second conductor 2 facing the first conductor 1 . By sandwiching the collar 4 between the two conductors 1 and 2 in this manner, the two conductors 1 and 2 are positioned at a predetermined distance from each other.

The inner diameter of the collar 4 is larger than the diameter of the shank 31 of the screw 3 . The shank 31 of the screw 3 can thus be inserted into the collar 4 . In the illustrated example, the inner diameter dimension of the collar 4 is the same as the diameter dimension of the through hole 11 of the first conductor 1, but may be different from the diameter dimension of the through hole 11, for example.

As shown in FIGS. 1 to 3, the insulating bushing 5 has a cylindrical portion 51 and a flange portion 52. As shown in FIGS.
The inner diameter dimension of the tubular portion 51 is larger than the diameter dimension of the shaft portion 31 of the screw 3 and smaller than the diameter dimension of the head portion 32 of the screw 3 . Therefore, the shaft portion 31 of the screw 3 is inserted into the cylindrical portion 51, but the head portion 32 of the screw 3 is not inserted. The outer diameter dimension of the tubular portion 51 is smaller than the diameter dimension of the through hole 11 of the first conductor 1 and the inner diameter dimension of the collar 4 . The axial length of the cylindrical portion 51 is greater than the axial length of the through hole 11 of the first conductor 1 and equal to or less than the sum of the axial lengths of the collar 4 and the through hole 11. is.

The flange portion 52 is formed integrally with the first axial end of the cylindrical portion 51 . The flange portion 52 is formed in an annular shape that protrudes in the radial direction of the tubular portion 51 from the outer periphery of the tubular portion 51 . The outer diameter dimension of the flange portion 52 is larger than the diameter dimension of the through hole 11 of the first conductor 1 . The flange portion 52 includes an inner flange portion 53 and an outer flange portion 54 .
The inner flange portion 53 is connected to the first end of the tubular portion 51 . The outer diameter dimension of the inner flange portion 53 is larger than the diameter dimension of the through hole 11 of the first conductor 1 and the diameter dimension of the head portion 32 of the screw 3 .

The inner flange portion 53 of this embodiment has a small diameter portion 531 and a large diameter portion 532 . The small diameter portion 531 and the large diameter portion 532 are arranged in order in the axial direction of the tubular portion 51 from the first end of the tubular portion 51 . The small diameter portion 531 and the large diameter portion 532 have the same outer diameter. The inner diameter dimension of the small diameter portion 531 is larger than the diameter dimension of the shaft portion 31 of the screw 3 and smaller than the diameter dimension of the head portion 32 of the screw 3 , similarly to the inner diameter dimension of the cylindrical portion 51 . On the other hand, the inner diameter dimension of the large diameter portion 532 is larger than the inner diameter dimension of the small diameter portion 531 and the diameter dimension of the head portion 32 of the screw 3 . Therefore, when the shaft portion 31 of the screw 3 is inserted into the flange portion 52 and the cylindrical portion 51 in order, the head portion 32 of the screw 3 is accommodated inside the large-diameter portion 532 and the cylindrical portion 51 contacts the end surface of the small diameter portion 531 facing the large diameter portion 532 side in the axial direction of .
The thickness of the small diameter portion 531 in the axial direction is preferably thick enough to withstand being sandwiched between the head portion 32 of the screw 3 and the first conductor 1 in the axial direction.

The outer flange portion 54 protrudes from the outer periphery of the inner flange portion 53 in the radial direction of the tubular portion 51 . The thickness of the outer flange portion 54 in the axial direction of the cylindrical portion 51 is smaller than the thickness of the inner flange portion 53 .
The outer flange portion 54 of the present embodiment is formed in a plate shape having a thickness in the axial direction smaller than that of the inner flange portion 53 . The thickness of the outer flange portion 54 is constant in the radial direction of the tubular portion 51 . In this embodiment, the thickness of the outer flange portion 54 is smaller than the thickness of the small diameter portion 531 and the large diameter portion 532 of the inner flange portion 53 .

Further, a surface 57 of the outer flange portion 54 facing the cylindrical portion 51 in the axial direction (hereinafter referred to as a facing surface 57 ) faces the cylindrical portion 51 in the axial direction of the inner flange portion 53 . It is flush with the side facing surface 55 (hereinafter referred to as the facing surface 55). That is, the outer flange portion 54 is located at the first end of the inner flange portion 53 located on the cylindrical portion 51 side in the axial direction. For this reason, the outer flange portion 54 is positioned so as to have a step with respect to the opposite side surface 56 of the inner flange portion 53 facing in the axial direction of the tubular portion 51 , opposite to the facing surface 55 of the inner flange portion 53 .

In the conductor connecting structure of the present embodiment, the insulating bush 5 described above is provided to the first conductor 1 and the collar 4 as follows.
The tubular portion 51 of the insulating bush 5 is inserted into the through hole 11 of the first conductor 1 and the collar 4 in order from the opposite side 13 of the first conductor 1 facing away from the facing surface 12 . Here, the outer diameter dimension of the flange portion 52 of the insulating bush 5 is larger than the diameter dimension of the through hole 11 . Therefore, the flange portion 52 is not inserted into the through hole 11 of the first conductor 1 . In this state, the facing surfaces 55 and 57 of the flange portion 52 (the inner flange portion 53 and the outer flange portion 54 ) face the opposite side surface 13 of the first conductor 1 . Further, the axial length of the tubular portion 51 is equal to or less than the sum of the axial lengths of the collar 4 and the through hole 11 in the axial direction. Therefore, even if the flange portion 52 is pressed against the opposite side surface 13 of the first conductor 1 , the axial second end of the cylindrical portion 51 does not reach the opposing surface 22 of the second conductor 2 .

As shown in FIGS. 1 and 3 , the conductor connection structure of this embodiment further includes an insulating plate 6 . The insulating plate 6 is formed in a plate shape having electrical insulation. The thickness of the insulating plate 6 may be thinner than the thickness of the outer flange portion 54 as in the illustrated example, or may be greater than or equal to the thickness of the outer flange portion 54, for example. The insulating plate 6 is arranged between the first conductor 1 and the flange portion 52 . In this state, the insulating plate 6 extends outside the outer periphery of the flange portion 52 in the radial direction of the tubular portion 51 .

In the conductor connection structure of this embodiment, the screw 3 is provided to the two conductors 1 and 2 and the insulating bush 5 as follows. The shaft portion 31 of the screw 3 is inserted through the tubular portion 51 of the insulating bush 5 from the first conductor 1 side. Furthermore, the tip of the shaft portion 31 of the screw 3 meshes with the female screw hole 21 of the second conductor 2 . Thereby, the inner flange portion 53 , the first conductor 1 and the collar 4 are sandwiched between the head 32 of the screw 3 and the second conductor 2 . Also, the first conductor 1 and the inner flange portion 53 are sandwiched between the head 32 of the screw 3 and the collar 4 . Also, the insulating plate 6 is sandwiched between the flange portion 52 and the first conductor 1 . Also, the head 32 of the screw 3 is accommodated inside the large diameter portion 532 of the inner flange portion 53 and pressed against the end face of the small diameter portion 531 .
By providing the screws 3 as described above, the two conductors 1 and 2 are connected to each other.

According to the conductor connection structure and the insulating bush 5 of the present embodiment configured as described above, the outer flange portion 54 is formed on the outer periphery of the inner flange portion 53 . Therefore, compared to the case where the flange portion 52 does not include the outer flange portion 54, the outer diameter dimension of the flange portion 52 is increased. As a result, the insulation distance from the head 32 of the screw 3 to the first conductor 1 (particularly, the creepage distance from the head 32 of the screw 3 to the first conductor 1 along the surface of the flange portion 52) can be extended. can. This point will be specifically described below with reference to FIGS.

As shown in FIG. 5, in the conductor connection structure using the insulating bush 5Z in which the flange portion 52 is configured only by the inner flange portion 53, the path forming the creepage distance from the head portion 32 of the screw 3 to the first conductor 1 includes a first route R1 on the outer circumference of the inner flange portion 53 and a second route R2 on the facing surface 55 of the inner flange portion 53.
If the conductor connection structure does not include the insulating plate 6, the paths forming the creepage distance include the first path R1 but do not include the second path R2.

On the other hand, as shown in FIG. 4, in the conductor connection structure using the insulating bush 5 of the present embodiment, the path forming the creepage distance from the head 32 of the screw 3 to the first conductor 1 has the above-described In addition to the first route R1 and the second route R2, a third route R3 on the surface of the outer flange portion 54 is also included. The third route R3 is a route obtained by adding the fourth route R4 and the fifth route R5. The fourth path R4 extends from the outer periphery of the inner flange portion 53 to the outer edge of the outer flange portion 54 along the opposite side surface 58 of the outer flange portion 54 facing away from the facing surface 57 of the outer flange portion 54 . The fifth path R5 extends from the outer edge of the outer flange portion 54 to the inner edge along the facing surface 57 of the outer flange portion 54 . In the conductor connection structure of the present embodiment, the creepage distance can be extended by the third route R3 as compared with the case where the flange portion 52 does not include the outer flange portion 54 .
When the conductor connection structure of the present embodiment does not include the insulating plate 6, the paths forming the creepage distance include the first path R1 and the fourth path R4, but include the second path R2 and the fifth path R5. do not have. Even in this case, compared to the configuration of FIG. 5 in which the flange portion 52 does not include the outer flange portion 54, the creepage distance can be extended by the fourth route R4.

Further, according to the conductor connection structure of the present embodiment, the length of the collar 4 and the length of the tubular portion 51 in the arrangement direction of the two conductors 1 and 2 (especially the length of the tubular portion 51 inserted into the collar 4 are length), the creepage distance R6 from the shaft portion 31 of the screw 3 to the first conductor 1 along the outer peripheral surface of the cylindrical portion 51, and along the inner and outer peripheral surfaces of the collar 4 Therefore, the creepage distance R7 from the first conductor 1 to the second conductor 2 can be made equivalent to the creepage distance from the head 32 of the screw 3 to the first conductor 1. As described above, the insulation distance between the first conductor 1 and the second conductor 2 can be ensured.

Further, according to the conductor connection structure and the insulating bush 5 of the present embodiment, the thickness of the outer flange portion 54 is smaller than that of the inner flange portion 53 . As a result, the amount of insulating material or resin material for manufacturing the insulating bushing 5 can be reduced.
Therefore, according to the conductor connection structure and the insulating bush 5 of the present embodiment, the insulation distance from the head 32 of the screw 3 to the first conductor 1 can be secured while reducing the material required for manufacturing the insulating bush 5. can be done.

In addition, since the thickness of the outer flange portion 54 of the insulating bush 5 is smaller than that of the inner flange portion 53, the size of the electric device including the insulating bush 5 can be reduced. This point will be described below.
For example, with an insulation bushing in which the outer flange portion 54 is as thick as the inner flange portion 53, the outer flange portion 54 cannot be bent. Therefore, when the flange portion 52 is arranged on the opposite side surface 13 of the first conductor 1, the outer flange portion 54 protrudes from the end of the first conductor 1 in the direction along the opposite side surface 13 of the first conductor 1. There is In this case, other components of the electrical device (eg walls of the housing, etc.) must be spaced from the end of the first conductor 1 . As a result, miniaturization of electrical equipment cannot be achieved. That is, the flange portion 52 of the insulating bush hinders miniaturization of the electrical equipment.
In contrast, in the insulating bushing 5 of the present embodiment in which the thickness of the outer flange portion 54 is smaller than that of the inner flange portion 53, the outer flange portion 54 can be bent. Therefore, the portion of the outer flange portion 54 that protrudes from the end of the first conductor 1 can be bent and inserted into the gap between the end of the first conductor 1 and other components of the electrical device. Thereby, the distance between the first conductor 1 and other components can be reduced. As a result, it is possible to reduce the size of the electrical equipment.

Further, according to the conductor connection structure and the insulating bush 5 of the present embodiment, the facing surface 57 of the outer flange portion 54 and the facing surface 55 of the inner flange portion 53 are flush with each other. Therefore, when the flange portion 52 is pressed against the first conductor 1 by the screw 3 , the outer flange portion 54 is pressed against the first conductor 1 together with the inner flange portion 53 . That is, no space (gap) is generated between the outer flange portion 54 and the first conductor 1 . Accordingly, even if an external force acts on the outer flange portion 54, it is possible to prevent stress from being applied to the connecting portion between the inner flange portion 53 and the outer flange portion 54. FIG. Therefore, the outer flange portion 54 can be protected from external force.

Further, according to the conductor connection structure and the insulating bush 5 of the present embodiment, the outer flange portion 54 is formed in a plate shape having a smaller thickness in the axial direction than the inner flange portion 53 of the cylindrical portion 51 . As a result, the material required for manufacturing the insulating bush 5 can be further reduced.

Further, according to the conductor connection structure of the present embodiment, the insulating plate 6 arranged between the first conductor 1 and the flange portion 52 extends outside the outer periphery of the flange portion 52 . In this case, the insulation distance from the head 32 of the screw 3 to the first conductor 1 can be extended. This insulation distance is the clearance or creepage distance from the head 32 of the screw 3 to the opposite side 13 of the first conductor 1 .

[Second embodiment]
Next, a second embodiment of the invention will be described with reference to FIGS. In the second embodiment, the same components as in the first embodiment are denoted by the same reference numerals, and descriptions thereof are omitted.

As shown in FIGS. 6 and 7, the flange portions 52B and 52C of the insulating bushes 5B and 5C of the present embodiment are provided with an inner flange portion 53 and outer flange portions 54B and 54C as in the first embodiment. . The inner flange portion 53 is formed in the same manner as in the first embodiment. Further, the outer flange portions 54B and 54C are formed in a plate shape having a smaller thickness in the axial direction of the cylindrical portion 51 than the thickness of the inner flange portion 53, as in the first embodiment.
However, in the insulating bushings 5B and 5C of the present embodiment, the facing surfaces 57 of the outer flange portions 54B and 54C are located closer to the tubular portion 51 and the first flange portion than the facing surfaces 55 of the inner flange portions 53 in the axial direction of the tubular portion 51 . located away from the conductor 1; The facing surface 55 of the inner flange portion 53 and the facing surfaces 57 of the outer flange portions 54B and 54C are preferably positioned with a predetermined distance (eg, 1 mm or more) in the axial direction of the cylindrical portion 51, for example.

In the insulation bushing 5B of the first example shown in FIG. 6, the outer flange portion 54B is flush with the opposite side surface 56 of the inner flange portion 53. That is, the outer flange portion 54B is located at the second end of the inner flange portion 53 located on the opposite side of the tubular portion 51 in the axial direction of the tubular portion 51 . Therefore, the outer flange portion 54B is positioned so as to have a step with respect to the facing surface 55 of the inner flange portion 53 in the axial direction of the tubular portion 51 .
On the other hand, in the insulating bushing 5C of the second example shown in FIG. Therefore, the outer flange portion 54</b>C is positioned so as to have a step with respect to both the facing surface 55 and the opposite side surface 56 of the inner flange portion 53 in the axial direction of the tubular portion 51 .

According to the insulating bushes 5B and 5C of the second embodiment and the conductor connection structure including the same, the same effects as those of the first embodiment can be obtained.
Further, according to the connecting structure of the insulating bushes 5B, 5C and conductors of the second embodiment, the facing surface 57 of the outer flange portions 54B, 54C is located closer to the facing surface 55 of the inner flange portion 53 than the facing surface 55 of the inner flange portion 53 in the axial direction of the cylindrical portion 51. is also located away from the tubular portion 51 and the first conductor 1 . Therefore, when the conductor connection structure does not include the insulating plate 6, the creepage distance from the head portion 32 of the screw 3 to the opposite side surface 13 of the first conductor 1 can be extended.

For example, in the insulating bushing 5 of the first embodiment, the facing surface 57 of the outer flange portion 54 and the facing surface 55 of the inner flange portion 53 are flush with each other. Therefore, when the conductor connection structure does not include the insulating plate 6, the paths forming the creepage distance from the head 32 of the screw 3 to the first conductor 1 include the first path R1 on the outer circumference of the inner flange portion 53, A fourth path R4 is included on the opposite side 58 of the outer flange portion 54 (see FIG. 4).

On the other hand, as shown in FIGS. 6 and 7, in the insulating bushings 5B and 5C of the second embodiment, even if the conductor connection structure does not include the insulating plate 6, the head 32 of the screw 3 is connected to the conductor. In addition to the above-described first route R1 and fourth route R4, the route forming the creepage distance to the one conductor 1 further includes a fifth route R5 on the facing surfaces 57 of the outer flange portions 54B and 54C. In addition, the first path R1 in the insulating bushes 5B and 5C of the second example shown in FIG. 7 is divided into two by the outer flange portions 54B and 54C. In the conductor connection structure of the second embodiment, the creepage distance can be extended by the fifth route R5 as compared with the first embodiment.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIG. In the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and descriptions thereof are omitted.

As shown in FIG. 8, a flange portion 52D in an insulating bushing 5D of this embodiment includes an inner flange portion 53 and an outer flange portion 54D, as in the first embodiment. The inner flange portion 53 is formed in the same manner as in the first embodiment. The thickness of the outer flange portion 54D in the axial direction of the cylindrical portion 51 is smaller than the thickness of the inner flange portion 53, as in the first embodiment.

However, in the insulating bushing 5D of the present embodiment, the thickness of the outer flange portion 54D in the axial direction of the tubular portion 51 becomes smaller as the distance from the outer circumference of the inner flange portion 53 in the radial direction of the tubular portion 51 increases. Specifically, the facing surface 57 of the outer flange portion 54D is flush with the facing surface 55 of the inner flange portion 53, as in the first embodiment. That is, the facing surface 57 of the outer flange portion 54</b>D extends only in the radial direction of the cylindrical portion 51 from the outer circumference of the inner flange portion 53 .

On the other hand, the opposite side surface 58D of the outer flange portion 54D approaches the opposite surface 57 of the outer flange portion 54D in the axial direction of the tubular portion 51 as it separates from the outer periphery of the inner flange portion 53 in the radial direction of the tubular portion 51. inclined to Further, the opposite side surface 58D of the outer flange portion 54D is formed so as to continue to the opposite side surface 56 of the inner flange portion 53. As shown in FIG. That is, there is no step between the opposite side surface 58D of the outer flange portion 54D and the opposite side surface 56 of the inner flange portion 53D.

According to the insulating bush 5D of the third embodiment and the conductor connection structure including the same, the same effects as those of the first embodiment can be obtained.
Further, according to the connecting structure of the insulating bush 5D and the conductor of the third embodiment, the thickness of the outer flange portion 54D in the axial direction of the tubular portion 51 is It gets smaller as it goes away. Therefore, compared to the case where the outer flange portion 54 (see FIG. 1) is formed in a plate shape as in the first embodiment, the strength of the connecting portion between the inner flange portion 53 and the outer flange portion 54D is ensured. be able to. Therefore, even if an external force acts on the outer flange portion 54D and stress is applied to the connecting portion between the inner flange portion 53 and the outer flange portion 54D, it is possible to suppress the occurrence of defects in the connecting portion.

[Fourth embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIG. In the fourth embodiment, the same components as in the first and third embodiments are denoted by the same reference numerals, and descriptions thereof are omitted.

As shown in FIG. 9, the flange portion 52E in the insulating bushing 5E of this embodiment includes an inner flange portion 53 and an outer flange portion 54E, as in the first and third embodiments. The inner flange portion 53 is formed in the same manner as in the first embodiment. The thickness of the outer flange portion 54E in the axial direction of the tubular portion 51 is smaller than the thickness of the inner flange portion 53, as in the first embodiment. Further, the thickness of the outer flange portion 54E in the axial direction of the tubular portion 51 becomes smaller as the distance from the outer circumference of the inner flange portion 53 in the radial direction of the tubular portion 51 increases, as in the third embodiment.

However, in the insulating bushing 5E of this embodiment, the opposite side surface 58 of the outer flange portion 54E and the opposite side surface 56 of the inner flange portion 53 are flush with each other. That is, the opposite side surface 58 of the outer flange portion 54</b>E extends only in the radial direction of the cylindrical portion 51 from the outer circumference of the inner flange portion 53 .

On the other hand, the opposing surface 57E of the outer flange portion 54E approaches the opposite side surface 58 of the outer flange portion 54E in the axial direction of the tubular portion 51 as it separates from the outer periphery of the inner flange portion 53 in the radial direction of the tubular portion 51. inclined to Also, the facing surface 57E of the outer flange portion 54E is formed so as to be continuous with the facing surface 55 of the inner flange portion 53 . That is, there is no step between the facing surface 57E of the outer flange portion 54E and the facing surface 55 of the inner flange portion 53. As shown in FIG.

According to the insulating bush 5E of the fourth embodiment and the conductor connection structure including the same, the same effects as those of the first and third embodiments can be obtained.
Further, according to the connecting structure of the insulating bushing 5E and the conductor of the fourth embodiment, as in the second embodiment, the facing surface 57E of the outer flange portion 54E is aligned with the inner flange portion 53 in the axial direction of the tubular portion 51. It is located farther from the tubular portion 51 and the first conductor 1 than the facing surface 55 is. Therefore, when the conductor connection structure does not include the insulating plate 6, the creepage distance from the head portion 32 of the screw 3 to the opposite side surface 13 of the first conductor 1 can be extended.

Although the details of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

In the insulating bushing of the present invention, in a configuration in which the thickness of the outer flange portion decreases with increasing distance from the outer periphery of the inner flange portion in the radial direction of the tubular portion, for example, both the facing surface and the opposite side surface of the outer flange portion are the third , may be inclined in the same manner as in the fourth embodiment.

In the insulating bushing of the present invention, in a configuration in which the thickness of the outer flange portion decreases as the distance from the outer circumference of the inner flange portion in the radial direction of the cylindrical portion increases, for example, as in the second embodiment, the outer flange portion It may be positioned so as to have a step in the axial direction of the tubular portion with respect to the facing surface or the opposite side surface of the portion.

In the insulating bushing of the present invention, the inner flange portion may be composed of, for example, only the small diameter portion. That is, the inner flange portion does not have to be formed with an accommodating recess for accommodating the head portion of the screw.

In the conductor connection structure of the present invention, the second conductor may be provided with a through hole through which the shaft portion of the screw is inserted instead of forming the female threaded hole. In this case, when connecting the two conductors with a screw, the shank of the screw may be inserted through the through hole of the second conductor, and a nut may be attached to the tip of the shank.

1 First conductor 2 Second conductor 3 Screw 31 Shaft 32 Head 4 Collar 5, 5B, 5C, 5D, 5E Insulating bush 51 Cylindrical part 52, 52B, 52C, 52D, 52E Flange 53 Inner flange 54, 54B, 54C, 54D, 54E Outer flange portion 55 Opposite surface 56 Opposite side 57, 57E Opposite surface 58, 58D Opposite side

Claims (6)

A conductor connection structure in which two conductors are mutually connected with a screw while being spaced from each other,
an electrically insulating tubular collar disposed between the two conductors;
a tubular portion having electrical insulation, which is inserted into the first conductor and the collar in order and allows the shaft portion of the screw to pass through from the first conductor side; and located on the first conductor side. an insulating bush integrally formed at the first end in the axial direction of the tubular portion and having an annular flange portion projecting in the radial direction of the tubular portion from the outer circumference of the tubular portion;
The flange portion includes an inner flange portion connected to the first end of the tubular portion and sandwiched between the head of the screw and the collar together with the first conductor; an outer flange portion that extends in the direction of the cylindrical portion and has a thickness in the axial direction that is smaller than that of the inner flange portion ;
A conductor connection structure in which the thickness of the outer flange portion in the axial direction decreases with increasing distance from the outer periphery of the inner flange portion in the radial direction . 2. An insulating plate formed in a plate-like shape having electrical insulation properties, provided between the first conductor and the flange portion and extending outward from the outer circumference of the flange portion in the radial direction. A connection structure of the conductors described. A conductor connection structure in which two conductors are mutually connected with a screw while being spaced from each other,
an electrically insulating tubular collar disposed between the two conductors;
a tubular portion having electrical insulation, which is inserted into the first conductor and the collar in order and allows the shaft portion of the screw to pass through from the first conductor side; and located on the first conductor side. an insulating bush integrally formed at the first end in the axial direction of the tubular portion and having an annular flange portion projecting in the radial direction of the tubular portion from the outer circumference of the tubular portion;
The flange portion includes an inner flange portion connected to the first end of the tubular portion and sandwiched between the head of the screw and the collar together with the first conductor; an outer flange portion that extends in the direction of the cylindrical portion and has a thickness in the axial direction that is smaller than that of the inner flange portion ;
A conductor connection structure including an insulating plate formed in an electrically insulating plate shape, disposed between the first conductor and the flange portion and extending outward from the outer circumference of the flange portion in the radial direction. . 4. The conductor connection structure according to claim 3 , wherein the outer flange portion is formed in a plate shape having a smaller thickness in the axial direction than the inner flange portion. 5. The method according to any one of claims 1 to 4, wherein the facing surface of the outer flange facing the first conductor is flush with the facing surface of the inner flange facing the first conductor. Connection structure of conductors. A facing surface of the outer flange portion facing the first conductor is located further away from the first conductor than a facing surface of the inner flange portion facing the first conductor in the axial direction. Item 5. The conductor connection structure according to any one of items 4 .

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