Support insulator

Abstract

To provide a support insulator which can stably support a plurality of insert metal parts in a well-balanced manner.SOLUTION: A support insulator (10) includes a body part (11) formed of a resin, and a plurality of insert metal parts (12) embedded in the end in an extension direction of the body part. The body part includes a lower cylindrical body (21) which forms the outer periphery of the end in the extension direction and has an approximately cylindrical shape, a plurality of lower holding bodies (22) which are provided inside the lower cylindrical body and hold the insert metal parts, and a rib (23) which extends inward from the inner periphery of the lower cylindrical body and supports the holding bodies. A plurality of ribs are provided on the lower holding bodies. The plurality of ribs include a pair of first connection ribs (25) for connecting a space between the adjacent lower holding bodies around a central axis and the inside of the lower cylindrical body, and a second connection rib (26) for connecting the lower holding bodies and the inside of the lower cylindrical body between the pair of first connection ribs.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to an insulator that supports a device that becomes a high voltage.

Background Art

[0002] As an insulator that electrically insulates various devices composed of a switchboard or a high-voltage conductor, an insulator disclosed in Patent Document 1 is known. In the insulator of Patent Document 1, insert metal portions directed inward of the insulator body are provided on the upper end surface and the lower end surface of the insulator body formed of resin. Threaded holes into which bolts are screwed are formed in the insert metal portions.

[0003] In the insulator of Patent Document 2, a single insert metal portion is provided at the upper center position of the insulator body having a circular shape when viewed from above. In Cited Document 2, the insulator body includes an outer peripheral portion that forms a cylindrical outer surface, an inner peripheral portion that is formed concentrically with the outer peripheral portion and holds the insert metal portion, and a plurality of ribs formed between the inner peripheral portion and the outer peripheral portion. The plurality of ribs are provided radially from the inner peripheral portion toward the outer peripheral portion, and are formed in parallel in the radial direction of the outer peripheral portion and at equal angles.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In each of the support insulators of Patent Documents 1 and 2, there is only one insert metal part at the end of the insulator body. On the other hand, due to reasons such as improving the support strength of various devices, there is a need for a configuration in which a plurality of insert metal parts are arranged side by side. The inventor has invented a novel support structure using ribs so as to stably and evenly support a plurality of insert metal parts while meeting such needs.

[0006] The present invention has been made in view of such points, and an object thereof is to provide a support insulator capable of stably and evenly supporting a plurality of insert metal parts.

Means for Solving the Problems

[0007] The support insulator of the present invention includes a main body portion formed of resin and extending along a predetermined straight line extension direction, and an insert metal portion embedded at an end portion of the main body portion in the extension direction. The support insulator is such that a plurality of the insert metal portions are provided at at least one of both end portions of the main body portion in the extension direction. The main body portion includes a substantially cylindrical tubular body forming an outer periphery of an end portion in the extension direction, a holding body provided inside the tubular body for holding the insert metal portion, and ribs extending inward from an inner periphery of the tubular body for supporting the holding body. At the end portion where a plurality of the insert metal portions are provided, when viewed from the central axis direction of the tubular body, the holding bodies are provided at substantially equal angles around the central axis, and a plurality of the ribs are provided for each of the holding bodies. The plurality of ribs include a pair of first connecting ribs connecting between the adjacent holding bodies around the central axis and the inside of the tubular body, and a second connecting rib connecting between the pair of first connecting ribs and the inside of the tubular body and the holding body.

Effects of the Invention

[0008] According to the present invention, a holding body that holds an insert metal part can be supported by a pair of first connection ribs and second connection ribs. As a result, in a configuration where a plurality of holding bodies are formed side by side at the end of the main body part, each holding body can be supported by ribs at at least three positions, and the rigidity of the main body part can be ensured by the cavities formed by each connection rib, the holding body, and the cylindrical body. Therefore, even when an external force is applied to the support insulator, a plurality of insert metal parts held by the holding body can be stably and evenly supported.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the present invention is not limited to the following embodiments and can be appropriately modified and implemented within the scope of not changing the gist thereof. In the following figures, for the sake of convenience of explanation, some configurations may be omitted. Also, in the following description, unless otherwise specified, "up", "down", "left", "right", "front", and "rear" are used based on the directions indicated by the arrows in each figure. However, the orientation of each configuration in the following embodiments is merely an example and can be changed to any orientation.

[0011] FIG. 1 is a front view of an insulator according to an embodiment. FIG. 2 is a bottom view of the insulator, and FIG. 3 is a plan view of the insulator. As shown in FIG. 1, the insulator 10 includes a main body portion 11 along the vertical direction that is the extending direction of a predetermined straight line. As shown in FIGS. 2 and 3, the insulator 10 further includes insert metal portions 12 embedded in plurality at both the lower end portion 11A and the upper end portion 11B of the main body portion 11. As shown in FIG. 2, four (a plurality) insert metal portions 12 are provided at the lower end portion 11A of the main body portion 11, and as shown in FIG. 3, two (a plurality) insert metal portions 12 are provided at the upper end portion 11B of the main body portion 11.

[0012] The insulator 10 is installed, for example, along various devices such as a switchboard or a metal plate on a predetermined base surface, and a fastening member such as a bolt inserted through a through hole in the metal plate is screwed into a female screw hole 12a (see FIG. 4) of the insert metal portion 12 for fixation. By such fixation, various devices such as a switchboard can be supported on a predetermined base surface via the insulator 10.

[0013] The main body portion 11 can be formed of a thermosetting resin or a thermoplastic resin having electrical insulation properties. In the present embodiment, the main body portion 11 is formed by injection molding a resin material obtained by mixing a thermoplastic resin as a base. Such a resin material will be described later.

[0014] On the outer surface of the main body portion 11, a plurality of flange portions 11C are formed between the lower end portion 11A and the upper end portion 11B, and are formed in a corrugated shape in which unevenness is repeated.

[0015] Next, referring to FIG. 2, the configuration of the lower end portion 11A of the main body portion 11 will be described. In the lower end portion 11A, the main body portion 11 includes a substantially cylindrical lower cylindrical body (cylindrical body) 21 that forms the outer periphery of the lower end portion 11A, a substantially cylindrical lower holder (holder) 22 that is provided inside the lower cylindrical body 21 and holds the insert metal portion 12, and a plurality of ribs 23 that extend inward from the inner periphery of the lower cylindrical body 21 and support the lower holder 22. In the lower end portion 11A of the main body portion 11, four lower holders 22 are formed, and one insert metal portion 12 is held in each lower holder 22. Therefore, four insert metal portions 12 are held in the lower end portion 11A of the main body portion 11.

[0016] In FIG. 2, the symbol "C1" is the central axis C1 of the lower cylindrical body 21. When viewed from below in the central axis direction of the lower cylindrical body 21 (in the state shown in FIG. 2), the lower holders 22 are provided at approximately 90° intervals around the central axis C1 of the lower cylindrical body 21. In the present embodiment, the four lower holders 22 are provided on both the front and rear sides and both the left and right sides of the central axis C1 of the lower cylindrical body 21. The adjacent lower holders 22 around the central axis C1 of the lower cylindrical body 21 are formed to be continuous so as to be connected to each other. Therefore, for example, the front lower holder 22 and the rear lower holder 22 adjacent to the lower holder 22 located on the right side are connected to the lower holder 22 located on the right side around the central axis C1 of the lower cylindrical body 21.

[0017] In the lower end portion 11A of the main body portion 11, the structures of the lower holder 22 and the ribs 23 are repeatedly provided with the same structure at approximately 90° intervals around the central axis C1 of the lower cylindrical body 21. Therefore, hereinafter, regarding the lower end portion 11A, the lower holder 22 located on the right side and the ribs 23 continuous with the lower holder 22 will be described, and the description of the same structures of the other lower holders 22 and ribs 23 will be omitted.

[0018] A plurality (four in the present embodiment) of ribs 23 are provided for the lower holder 22 located on the right side. The four ribs 23 include a pair of first connection ribs 25 and a pair of second connection ribs 26.

[0019] A pair of first connection ribs 25 are provided on both the front and rear sides of the lower holder 22 to connect the lower holder 22 and the inside of the lower cylindrical body 21. Specifically, one end side of the front first connection rib 25 is continuous with the connection part between the right lower holder 22 and the front lower holder 22. And the front first connection rib 25 extends substantially parallel to the radial direction of the lower cylindrical body 21, and the other end side is continuous with the inner surface of the lower cylindrical body 21. Also, one end side of the rear first connection rib 25 is continuous with the connection part between the right lower holder 22 and the rear lower holder 22. And the rear first connection rib 25 extends substantially parallel to the radial direction of the lower cylindrical body 21, and the other end side is continuous with the inner surface of the lower cylindrical body 21.

[0020] A pair of second connection ribs 26 are provided between the pair of first connection ribs 25 described above to connect the right side surface of the lower holder 22 and the inside of the lower cylindrical body 21.

[0021] The first connection rib 25 and the second connection rib 26 connected to the right lower holder 22 are formed symmetrically in the front and rear. In other words, in FIG. 2, a virtual line L1 passing through the central axis C1 of the lower cylindrical body 21 and the central axis C2 of the lower holder 22 extends in the left - right direction, and the first connection rib 25 and the second connection rib 26 are symmetrically arranged with respect to such a virtual line L1.

[0022] Also, in FIG. 2, at positions adjacent to the right lower holder 22, two cavities S1 surrounded by the lower holder 22, the first connection rib 25, the second connection rib 26, and the lower cylindrical body 21 are formed. The two cavities S1 are also formed symmetrically in the front and rear.

[0023] Here, the two cavities S1 are each formed in a substantially quadrilateral shape, and are formed in a quadrilateral shape in which one of the two inner angles formed closer to the lower holder 22 is an acute angle and the other is an obtuse angle. Specifically, in the cavity S1, the inner angle between the lower holder 22 and the first connection rib 25 is formed as an acute angle, and the inner angle between the lower holder 22 and the second connection rib 26 is formed as an obtuse angle.

[0024] Further, the first connection rib 25 and the second connection rib 26 that form the same right cavity S1 are formed with different lengths and are provided substantially parallel to each other. At least one of the first connection rib 25 and the second connection rib 26 that are substantially parallel is non-parallel to the radial direction of the lower cylindrical body 21. In the present embodiment, as described above, the first connection rib 25 is parallel to the radial direction of the lower cylindrical body 21, and the second connection rib 26 is directed in a direction inclined with respect to the radial direction of the lower cylindrical body 21 at its formation position and is non-parallel to the radial direction of the lower cylindrical body 21.

[0025] In the cavity S1 having a substantially rectangular shape, an arch-shaped structure ST1 (represented by a lattice pattern in FIG. 2) is formed by the lower cylindrical body 21, the first connection rib 25, and the second connection rib 26 that form the cavity S1. Further, an angle-shaped structure ST2 (represented by a dot pattern in FIG. 2) is formed by the lower holding body 22 and the first connection rib 25 that form such a cavity S1.

[0026] At the entire lower end portion 11A of the main body portion 11, four first connection ribs 25 and eight second connection ribs 26 are provided, and each first connection rib 25 is provided at the boundary position of the adjacent lower holding bodies 22 around the central axis C1 of the lower cylindrical body 21. Therefore, one first connection rib 25 is configured to be provided on both of the adjacent lower holding bodies 22.

[0027] Subsequently, referring to FIG. 3, the configuration of the upper end portion 11B of the main body portion 11 will be described. At the upper end portion 11B, the main body portion 11 includes a substantially cylindrical upper cylindrical body (cylindrical body) 31 that forms the outer periphery of the upper end portion 11B, a substantially cylindrical upper holding body (holding body) 32 that is provided inside the upper cylindrical body 31 and holds the insert metal portion 12, and a plurality of ribs 33 that extend inward from the inner periphery of the upper cylindrical body 31 and support the upper holding body 32. At the upper end portion 11B of the main body portion 11, two upper holding bodies 32 are formed, and one insert metal portion 12 is held on each upper holding body 32. Therefore, two insert metal portions 12 are held at the upper end portion 11B of the main body portion 11.

[0028] The central axis C1 of the upper cylindrical body 31 is in the same position as the central axis C1 (see FIG. 2) of the lower cylindrical body 21. In FIG. 3, when viewed from above in the direction of the central axis of the upper cylindrical body 31 (in the state shown in FIG. 3), the upper holding body 32 is provided at approximately every 180°, which is approximately equal-angle intervals around the central axis C1 of the upper cylindrical body 31. In the present embodiment, the two upper holding bodies 32 are provided on both the left and right sides of the central axis C1 of the upper cylindrical body 31. The two upper holding bodies 32 are provided with a predetermined interval therebetween in the left-right direction, and the front end portions and the rear end portions are connected to each other by a pair of connecting ribs 34.

[0029] At the upper end portion 11B of the main body portion 11, the structures of the upper holding body 32 and the rib 33 are provided symmetrically with respect to the left and right. Therefore, hereinafter, the upper holding body 32 located in the right half portion and the rib 33 continuous with the upper holding body 32 at the upper end portion 11B of FIG. 3 will be described, and the description of the similar structures regarding the upper holding body 32 and the rib 33 in the left half portion will be omitted.

[0030] A plurality (six in the present embodiment) of ribs 33 are provided for the upper holding body 32 located on the right side. The six ribs 33 include the pair of connecting ribs 34 described above, a pair of first connecting ribs 35, and a pair of second connecting ribs 36.

[0031] The pair of first connecting ribs 35 are provided on both the front and rear sides of the upper holding body 32 and connect the upper holding body 32 and the inside of the upper cylindrical body 31. Specifically, one end side of the front first connecting rib 35 is continuous with the connection portion between the upper holding body 32 on the right side and the front connecting rib 34. Then, the front first connecting rib 35 extends substantially parallel to the radial direction of the upper cylindrical body 31, and the other end side is continuous with the inner surface of the upper cylindrical body 31. Also, one end side of the rear first connecting rib 35 is continuous with the connection portion between the upper holding body 32 on the right side and the rear connecting rib 34. Then, the rear first connecting rib 35 extends substantially parallel to the radial direction of the upper cylindrical body 31, and the other end side is continuous with the inner surface of the upper cylindrical body 31.

[0032] The pair of second connecting ribs 36 are provided between the pair of first connecting ribs 35 described above and connect both the front and rear surfaces of the upper holding body 32 and the inside of the upper cylindrical body 31.

[0033] The connecting rib 34, the first connecting rib 35, and the second connecting rib 36 connected to the upper holding body 32 on the right side are formed symmetrically in the front and rear. In other words, in FIG. 3, a virtual line L2 passing through the central axis C1 of the upper cylindrical body 31 and the central axis C3 of the upper holding body 32 extends in the left-right direction, and the connecting rib 34, the first connecting rib 35, and the second connecting rib 36 are symmetrically arranged with respect to such a virtual line L2.

[0034] Also, in FIG. 3, two cavities S2 surrounded by the upper holding body 32, the first connecting rib 35, the second connecting rib 36, and the upper cylindrical body 31 are formed on both the front and rear sides of the upper holding body 32 on the right side. The two cavities S2 are also formed symmetrically in the front and rear.

[0035] Here, the two cavities S2 are each formed in a substantially rectangular shape, and are formed in a rectangular shape in which one of the two inner angles formed closer to the upper holding body 32 is an acute angle and the other is an obtuse angle. Specifically, in the cavity S2, the inner angle between the upper holding body 32 and the first connecting rib 35 is formed as an acute angle, and the inner angle between the upper holding body 32 and the second connecting rib 36 is formed as an obtuse angle.

[0036] Also, the first connecting rib 35 and the second connecting rib 36 forming the same cavity S2 are formed to have different lengths. The second connecting rib 36 is directed in a direction inclined with respect to the radial direction of the upper cylindrical body 31 at its formation position, and is non-parallel to the radial direction of the upper cylindrical body 31.

[0037] In the cavity S2 having a substantially rectangular shape, an arch-shaped structure ST3 (represented by a lattice pattern in FIG. 3) is formed by the upper cylindrical body 31, the first connecting rib 35, and the second connecting rib 36 forming the cavity S2. Also, an angle-shaped structure ST4 (represented by a dot pattern in FIG. 3) is formed by the upper holding body 32 and the first connecting rib 35 forming such a cavity S2.

[0038] Here, the upper end portion 11B of the main body portion 11 further includes a pair of auxiliary support ribs 38. The auxiliary support ribs 38 extend from the middle portion in the extending direction of the connecting rib 34 substantially parallel to the radial direction of the upper cylindrical body 31 and are continuous with the inner surface of the upper cylindrical body 31.

[0039] Here, as shown in FIGS. 2 and 3, in addition to the above-described cavities S1 and S2, cavities S0 of various shapes are formed in the lower end portion 11A and the upper end portion 11B of the main body portion 11. The cavity S0 in the lower end portion 11A is formed surrounded by the lower cylindrical body 21, the lower holding body 22, and the rib 23, and the cavity S0 in the upper end portion 11B is formed surrounded by the upper cylindrical body 31, the upper holding body 32, and the rib 33.

[0040] FIG. 5 is a cross-sectional view taken along line B-B of FIGS. 2 and 3. As shown in FIG. 5, a wall portion 40 is formed in a central portion that is a part of the main body portion 11 in the vertical direction along a plane direction intersecting the vertical direction. The wall portion 40 is continuous with a forming surface extending in the vertical direction of the cavities S0, S1, and S2 in the main body portion 11, and is provided so as to protrude horizontally from the forming surface. By the wall portion 40, the cavity S1 formed in the lower end portion 11A of the main body portion 11 and the cavities S0 and S2 formed in the upper end portion 11B are partitioned and do not penetrate.

[0041] By forming the wall portion 40, on the forming surfaces of the cavities S0, S1, and S2, a surface that extends parallel to the vertical direction over the entire range across the upper and lower ends of the main body portion 11 is not formed, and the wall portion 40 is formed in a part of the vertical direction. Thereby, creeping discharge between a conductor connected to one side in the vertical direction of the main body portion 11 and a ground side connected to the other side can be suppressed.

[0042] Here, the resin material forming the main body portion 11 will be described. In the present embodiment, the main body portion 11 is formed of a resin material using a thermoplastic resin having excellent insulating performance and heat resistance. By using a thermoplastic resin for the main body portion 11, the curing reaction during molding in the case of using a thermosetting resin can be eliminated. Thereby, when performing waste disposal after use, the insert metal portion 12 can be easily separated from the main body portion 11 by heat treatment, and the recyclability can be enhanced. Further, by using a thermoplastic resin, an injection molding method that does not require a secondary curing reaction in the case of using a thermosetting resin can be used, and the productivity of the support insulator 10 can be improved.

[0043] As the thermoplastic resin used for the main body 11, any one of polybutylene terephthalate, polyethylene terephthalate, polyamide, polycarbonate, polyphenylene sulfide, and modified polyphenylene ether can be used. By using these, while maintaining good insulation and heat resistance of the main body 11, productivity can be improved. Also, if the temperature is raised to a melting temperature of about 200°C, the main body 11 and the insert metal part 12 can be easily separated, and each can be reused or disposed of, thus enhancing recyclability.

[0044] In the formation of the main body 11, a resin material obtained by mixing an inorganic material based on a thermoplastic resin may be used, and examples of the inorganic material that can be used include at least one of glass fiber, silica, alumina, boehmite, and talc. By using such an inorganic material, recyclability can be achieved and productivity can be improved without degrading mechanical properties such as the linear expansion coefficient and elastic modulus of the resin.

[0045] Also, in the main body 11, the thicknesses of the lower cylindrical body 21, the holding body 22, and the rib 23 of the lower end portion 11A, and the cavity S0 of the upper end portion 11B, and the thicknesses of the upper cylindrical body 31, the upper holding body 32, and the rib 33 are preferably set to 10 mm or less, and more preferably set to 2 mm or more and 6 mm or less. If each thickness exceeds the above range, voids are likely to occur during the molding process by injection molding, and there is a risk that electrical performance such as partial discharge will deteriorate during use.

[0046] More specifically, in injection molding, as the thickness of the main body portion 11 increases, the molten resin is pulled toward the outer surface side due to thermal contraction during resin cooling, so voids are likely to occur within the thickness of the main body portion 11. Voids become the source of partial discharge, and moreover, the larger they are, the more likely partial discharge is to occur at a lower electric field. Therefore, it is less likely to generate partial discharge when the voids are smaller. In the present embodiment, by setting the thickness of the main body portion 11 within the above range, while well exhibiting the mechanical strength as the support insulator 10, the voids are made small or eliminated to make it difficult to generate partial discharge, and sufficient withstand voltage and electrical performance can be exhibited.

[0047] According to such an embodiment, even if there are four lower holders 22 at the lower end portion 11A of the main body portion 11, each lower holder 22 can be supported from four positions of a pair of first connection ribs 25 and a pair of second connection ribs 26. Moreover, cavities S1 and S0 are formed by the respective connection ribs 25, 26, the lower cylindrical body 21, and the lower holder 22, and mechanical strength can be well exhibited.

[0048] Also, although there are two upper holders 32 at the upper end portion 11B of the main body portion 11, each upper holder 32 can be supported from four positions of a pair of first connection ribs 35 and a pair of second connection ribs 36. Moreover, cavities S2 and S0 are formed by ribs 33 such as the respective connection ribs 35, 36, the upper cylindrical body 31, and the upper holder 32, and mechanical strength can be well exhibited. Thus, even if the number of lower holders 22 and upper holders 32 is plural, it is possible to suppress a decrease in strength compared to the case where the number is single, and a plurality of insert metal portions 12 held by the lower holders 22 and upper holders 32 can be stably and evenly supported.

[0049] Here, in the support insulator 10, particularly, in the case where the electromagnetic force generated by an electric current during a short - circuit accident or the like becomes a load of several thousand newtons, it is necessary to be able to withstand this load in terms of strength. Such a load acts in the shear direction (for example, in the right - hand direction at the lower end portion 11A and in the left - hand direction at the upper end portion 11B as indicated by the arrows in FIG. 1). Against such a shear - direction load, the force resisting bending and deflection deformation can be dispersed and exerted at various locations by each of the connection ribs 25, 26, 35, 36 and the cavities S1, S2, S0, and the durability in terms of strength can be demonstrated.

[0050] Furthermore, in the main body portion 11, the first connection rib 25 and the second connection rib 26 are symmetrically arranged with respect to the virtual line L1 at the lower end portion 11A, and the first connection rib 35 and the second connection rib 36 are symmetrically arranged with respect to the virtual line L2 at the upper end portion 11B. Thereby, when viewed from the central axis C1 side, each of the connection ribs 25, 26, 35, 36 can be arranged in a well - balanced manner with respect to each of the holders 22, 32, and all of the holders 22, 32 can be stably supported.

[0051] Also, in the main body portion 11, an arch - shaped structure ST1 and an angle - shaped structure ST2 are formed surrounding the cavity S1 at the lower end portion 11A, and an arch - shaped structure ST3 and an angle - shaped structure ST4 are formed surrounding the cavity S2 at the upper end portion 11B. Thereby, when a shear - direction load is applied, any one of the structures ST1 to ST4 can effectively exert a resistance force against the load according to the direction in which the load is applied, and sufficient durability can be obtained.

[0052] In this way, by being able to effectively exert the resistance force against the load in the main body portion 11, it becomes possible to ensure the strength even if the thickness of each component part is reduced. In other words, it is possible to achieve thinning while demonstrating good strength, so that the generation of voids within the thickness during injection molding can be suppressed, partial discharge is less likely to occur, and the withstand voltage can also be demonstrated.

[0053] Note that the present invention is not limited to the above-described embodiments, and various modifications can be made and implemented. In the above-described embodiments, the sizes, shapes, orientations, etc. illustrated in the accompanying drawings are not limited thereto, and can be appropriately changed within the scope in which the effects of the present invention are exhibited. In addition, it can be appropriately changed and implemented as long as it does not deviate from the scope of the object of the present invention.

[0054] For example, in the main body portion 11, a plurality of insert metal portions 12 are provided at both the lower end portion 11A and the upper end portion 11B. However, the insert metal portion 12 may be singular at either the lower end portion 11A or the upper end portion 11B, or a configuration may be adopted in which the insert metal portion 12 is not provided.

[0055] Also, fastening members such as bolts do not have to be screwed into all of the plurality of insert metal portions 12 at the lower end portion 11A and the upper end portion 11B, and they may be used without screwing the fastening members into some of the insert metal portions 12.

[0056] Furthermore, although the case where the main body portion 11 is arranged along the vertical direction has been described, it may be arranged along the horizontal direction or the front-rear direction, or arranged in a direction inclined with respect to these directions.

[0057] Also, although the case where a pair of second connection ribs 26 and 36 are provided has been described, it may be one or three or more.

Explanation of Reference Numerals

[0058] 10 Support insulator 11 Main body portion 11A Lower end portion 11B Upper end portion 12 Insert metal portion 21 Lower cylindrical body (cylindrical body) 22 Lower holding body (holding body) 23 Rib 25 First connection rib 26 Second connection rib 31 Upper cylindrical body (cylindrical body) 32 Upper holding body (holding body) 33 Rib 35 First connection rib 36 Second connection rib 40 Wall part C1 Central axis C2 Central axis C3 Central axis L1 Virtual line L2 Virtual line S1 Cavity S2 Cavity ST1 Arch-shaped structure ST2 Angle-shaped structure ST3 Arch-shaped structure ST4 Angle-shaped structure

Claims

1. A main body portion formed of resin and extending along a predetermined straight line extension direction, and an insert metal portion embedded at an end portion of the main body portion in the extension direction, and comprising a support insulator in which a plurality of the insert metal portions are provided at at least one of both end portions of the main body portion in the extension direction, wherein the main body portion includes a substantially cylindrical tubular body forming an outer periphery of an end portion in the extension direction, a holding body provided inside the tubular body for holding the insert metal portion, and ribs extending inward from an inner periphery of the tubular body to support the holding body, and at an end portion where a plurality of the insert metal portions are provided, when viewed from the central axis direction of the tubular body, the holding bodies are provided at substantially equal angles around the central axis, and a plurality of the ribs are provided for each of the holding bodies, and the plurality of ribs include a pair of first connection ribs connecting between the adjacent holding bodies around the central axis and the inside of the tubular body, and a second connection rib connecting between the pair of first connection ribs and the inside of the tubular body and the holding body. A support insulator characterized by that.

2. The support insulator according to claim 1, wherein the second connection rib is a pair.

3. The holding body is formed in a substantially cylindrical shape, The first connection rib and the second connection rib are symmetrically arranged with respect to a virtual line passing through the central axis and the central axis of the holding body when viewed from the central axis direction of the tubular body. The support insulator according to claim 1 or claim 2.

4. When viewed from the central axis direction of the tubular body, a cavity surrounded by the tubular body, the holding body, the first connection rib, and the second connection rib is formed, and an arch-shaped structure is formed by the tubular body, the first connection rib, and the second connection rib forming the cavity, and an angle-shaped structure is formed by the holding body and the first connection rib. The support insulator according to any one of claims 1 to 3, characterized by that.

5. The support insulator according to claim 4, wherein the first connection rib and the second connection rib forming the cavity have different lengths.

6. The support insulator according to claim 4 or claim 5, wherein the first connection rib and the second connection rib forming the cavity are provided substantially in parallel, and at least one of them is non-parallel to the radial direction of the tubular body.

7. ​ When viewed from the axial direction of the cylindrical body, the cavity is formed in a substantially rectangular shape, and one inner angle closer to the holding body is formed as an acute angle and the other inner angle is formed as an obtuse angle. The support insulator according to any one of claims 4 to 6, characterized in that.

8. The support insulator according to any one of claims 4 to 7, characterized in that a wall portion intersecting the extending direction is continuously provided in a part of the extending direction of the cavity.

9. The support insulator according to any one of claims 1 to 8, characterized in that the main body portion is formed of a thermoplastic resin.

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