Terminal board and manufacturing method of the terminal board

Abstract

To facilitate alignment of a connecting portion and a nut.SOLUTION: A terminal block 10 includes a bus bar 20 having a connection end in which a screw through hole is formed, a resin portion 30 covering at least a portion of the bus bar 20, and a through nut having a screw hole penetrating therethrough. The through nut is superposed on the connecting end such that the screw hole is adjacent to the screw through hole. The resin portion 30 has a nut holding portion that holds the penetration nut at a position overlapping the connection end in a state of covering an opening portion of the screw hole on the opposite side to the connection end. The resin portion 30 is formed using the through nut as an insert portion.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to terminal blocks and methods of manufacturing terminal blocks. [Background technology]

[0002] Patent Document 1 discloses a technique in which a connection portion and a cap nut are assembled together, and then the connection portion and the cap nut are insert-molded to form a device-side housing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-095354 Summary of the Invention [Problem to be solved by the invention]

[0004] Here, it is desirable to be able to easily align the connection portion and the nut.

[0005] Therefore, an object of the present disclosure is to make it easier to align the connecting portion and the nut. [Means for solving the problem]

[0006] The terminal block of the present disclosure comprises a bus bar having a connection end with a screw through hole formed therein, a resin part covering at least a portion of the bus bar, and a through nut having a screw hole passing therethrough, wherein the through nut is placed on the connection end so that the screw hole is adjacent to the screw through hole, and the resin part has a nut holding part that holds the through nut in a position placed on the connection end while covering the opening of the screw hole on the opposite side to the connection end, and the resin part is molded using the through nut as an insert part.

[0007] The method for manufacturing a terminal block of the present disclosure includes preparing a bus bar having a connection end with a screw through hole formed therein and a through nut having a screw hole passing through it, passing a screw through the screw through hole and threading it into the screw hole to fix the through nut to the connection end, molding a resin part using the bus bar and the through nut as an insert part so as to cover at least a portion of the bus bar and the opening of the screw hole on the opposite side to the connection end, and after molding the resin part, removing the screw from the screw hole. [Effects of the Invention]

[0008] According to the present disclosure, the connection portion and the nut can be easily aligned. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view showing the terminal block from the front side. [Figure 2] FIG. 2 is a perspective view showing the terminal block from the rear side. [Figure 3] FIG. 3 is a side cross-sectional view showing the terminal block attached to the housing and connected to a mating terminal. [Figure 4] FIG. 4 is an explanatory diagram showing the process of molding the resin portion of the terminal block together with a mold. [Figure 5] FIG. 5 is an explanatory diagram showing the relative positions of the through nuts and screws when they are set in the mold. [Figure 6] FIG. 6 is a cross-sectional side view showing a molded terminal block. [Figure 7] FIG. 7 is an enlarged cross-sectional view showing a part of a nut holding portion and a through nut according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0010] [Description of the embodiments of the present disclosure] First, embodiments of the present disclosure will be listed and described.

[0011] The terminal block and the method for manufacturing the terminal block according to the present disclosure are as follows.

[0012] (1) A terminal block comprising: a bus bar having a connection end with a screw through hole formed therein; a resin part covering at least a portion of the bus bar; and a through nut having a screw hole passing therethrough, wherein the through nut is placed on the connection end so that the screw hole is adjacent to the screw through hole; the resin part has a nut holding part that holds the through nut in a position where it is placed on the connection end while covering an opening of the screw hole on the opposite side to the connection end; and the resin part is molded using the through nut as an insert part.

[0013] With this terminal block, the nut holding portion holds the through nut in a state overlapping the connection end, making it easy to connect a connection target to the connection end using a screw. Furthermore, the nut holding portion covers the opening of the screw hole on the side opposite the connection end, making it difficult for debris generated when threading the screw into the through nut to be discharged to the outside. The through nut has a threaded hole formed therethrough, making it easy to confirm the positional relationship between the screw through hole and the screw hole during manufacturing. This makes it easy to align the connection end and the through nut.

[0014] (2) In the terminal block of (1), the resin portion may include an extension hole located on an extension of the screw hole on the opposite side of the screw through hole, thereby providing a space at the back of the screw hole where the tip of the screw can be placed and where scraps can be collected.

[0015] (3) In the terminal block of (2), the inner periphery of the extension hole may be formed with an extended thread groove that is continuous with the thread groove of the screw hole. This allows, for example, when molding the resin part, a screw to be passed through the screw through hole and threaded into the through nut, with the tip of the screw protruding from the through nut. This allows the resin part to be molded with the through nut firmly fixed in a fixed position on the connection end.

[0016] (4) In the terminal block according to any one of (1) to (3), the nut holding portion may cover the periphery of the through nut and a portion of the through nut opposite the connection end, thereby ensuring insulation between the through nut and peripheral components.

[0017] (5) In the terminal block according to any one of (1) to (4), the bus bar may include a first connection end and a second connection end as the connection ends, a bent portion may be formed between the first connection end and the second connection end of the bus bar, the through nut may include a first through nut placed on the first connection end and a second through nut placed on the second connection end, and the resin part may include a first nut holding part that holds the first through nut and a second nut holding part that holds the second through nut as the nut holding part. This allows, for example, the resin part to be molded with a screw at each of the first connection end and the second connection end, while the bus bar is in close contact with the through nut.

[0018] (6) A method for manufacturing a terminal block includes preparing a bus bar having a connection end with a screw through hole formed therein and a through nut having a screw hole passing therethrough, passing a screw through the screw through hole and threading it into the screw hole to fix the through nut to the connection end, molding a resin part using the bus bar and the through nut as an insert part so as to cover at least a portion of the bus bar and an opening of the screw hole opposite the connection end, and after molding the resin part, removing the screw from the screw hole.

[0019] According to this method of manufacturing a terminal block, the resin portion covers the opening of the screw hole on the side opposite the connection end, so that debris generated when the screw is threaded into the through nut is less likely to be discharged to the outside. The through nut has a through-hole formed therein, making it easy to check the positional relationship between the screw through hole and the screw hole during manufacturing. Therefore, alignment of the connection end and the through nut can be easily performed. Furthermore, during molding of the resin portion, a screw can be passed through the through hole and threaded into the through nut, with the tip of the screw protruding from the through nut. This allows the resin portion to be molded with the through nut firmly fixed in a fixed position to the connection end.

[0020] [Details of the embodiments of the present disclosure] Specific examples of the terminal block and the manufacturing method of the terminal block according to the present disclosure will be described below with reference to the drawings. Note that the present disclosure is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope of the claims.

[0021] [Embodiment] The terminal block according to the embodiment will be described below.

[0022] <Overall structure> Fig. 1 is a perspective view showing the terminal block 10 from the front side. Fig. 2 is a perspective view showing the terminal block 10 from the rear side. Fig. 3 is a side cross-sectional view showing the terminal block 10 attached to the housing 1 and connected to the mating terminals 2 and 3.

[0023] The terminal block 10 is applied to supply power to devices such as motors and inverters mounted on hybrid vehicles, electric vehicles, etc. Therefore, the housing 1 may be a housing for a motor or a housing for an inverter.

[0024] As shown in Fig. 3, terminal block 10 has a first connecting end 22a connected to first counter terminal 2 and a second connecting end 22b connected to second counter terminal 3. In terminal block 10, a body portion 13 located between first connecting end 22a and second connecting end 22b is fitted into terminal block holding hole 1a formed in housing 1. A groove 14 into which an O-ring 15 is fitted is formed in body portion 13. With O-ring 15 fitted into groove 14, body portion 13 is fitted into terminal block holding hole 1a. As a result, terminal block holding hole 1a, which communicates between the inside and outside of housing 1, is sealed by body portion 13 and O-ring 15.

[0025] The terminal block 10 includes a bus bar 20, a resin part 30, and a through nut 40.

[0026] The busbar 20 is formed from a metal plate such as copper. The busbar 20 has connection ends 22 with screw through holes 21 formed therein. The busbar 20 includes a first connection end 22a and a second connection end 22b as the connection ends 22. The first connection end 22a and the second connection end 22b have the same structure, and in the following description, the first connection end 22a and the second connection end 22b are collectively referred to as connection ends 22. Furthermore, there are two of each of the screw through holes 21, nut holding portions 31, extension holes 32, inner peripheral portions 33, extension screw grooves 34, through nuts 40, screw holes 41, screw grooves 42, and openings 43 associated with the first connection end 22a and the second connection end 22b. When describing each of these parts, the names of the parts will be prefixed with "first" or "second," and the reference numerals will be suffixed with "a" or "b" to distinguish them from one another.

[0027] A screw through hole 21 (a first screw through hole 21a and a second screw through hole 21b) is formed in each connection end 22. In this embodiment, the screw through hole 21 is, for example, circular. The screw through hole 21 has a larger diameter than the screw hole 41. A bent portion 23 is formed in the bus bar 20 between the first connection end 22a and the second connection end 22b. In this embodiment, the bent portion 23 is bent at a right angle. The bent portion 23 may be bent, for example, at 90 degrees within an error range (for example, ±5 degrees), and may be bent preferably at an angle between 70 degrees and 110 degrees.

[0028] The resin portion 30 is formed of, for example, an insulating resin. Examples of the resin forming the resin portion 30 include polyamide 6T (PA6T), polyphenylene sulfide (PPS), and polybutylene terephthalate (PBT), with PA6T being more preferable. The resin portion 30 covers at least a portion of the busbar 20. The resin portion 30 has nut holding portions 31 (first nut holding portions 31a and second nut holding portions 31b) that hold the through nuts 40 (first through nut 40a and second through nut 40b) in a position overlapping the connecting end 22 while covering openings 43 (first openings 43a and second openings 43b) of the screw holes 41 (first screw hole 41a and second screw hole 41b) of the through nuts 40 (first through nut 40a and second through nut 40b). The resin portion 30 also includes extension holes 32 (first extension holes 32a and second extension holes 32b). The extended hole 32 is located on an extension of the screw through hole 21 on the opposite side of the screw hole 41. An extended screw groove 34 (a first extended screw groove 34a and a second extended screw groove 34b) is formed in the inner circumferential portion 33 (a first inner circumferential portion 33a and a second inner circumferential portion 33b) of the extended hole 32. The extended screw groove 34 is continuous with the screw groove 42 (a first screw groove 42a and a second screw groove 42b) of the screw hole 41.

[0029] The resin part 30 also includes the body 13. The first nut holding part 31a is connected to one end of the body 13, and the second nut holding part 31b is connected to the other end. Therefore, the first nut holding part 31a and the second nut holding part 31b are supported at fixed positions relative to the body 13. More specifically, the first nut holding part 31a is formed in a partial cylindrical shape. More specifically, the first nut holding part 31a is formed in a partial cylindrical shape surrounded by a flat surface and a partial cylindrical surface. The first nut holding part 31a is set to a size greater than a semicircle. The first connecting end 22a is located on the flat surface side, and the first through nut 40a is located on the cylindrical surface side of the first connecting end 22a.

[0030] The first nut holding portion 31a covers both sides of the first connecting end 22a extending from the body portion 13. One main surface of the first connecting end 22a is exposed on the side opposite to the first through nut 40a. The tip of the first connecting end 22a may be exposed from the first nut holding portion 31a.

[0031] The first nut holding portion 31a covers the four sides of the periphery of the first through nut 40a and the portion of the first through nut 40a opposite to the first connecting end 22a.

[0032] The first through nut 40a is covered on all four sides thereof and on one axial side thereof by a first nut holding portion 31a, and the other axial side of the first through nut 40a is covered by a first connecting end 22a.

[0033] The body portion 13 has a shape in which a cylindrical portion 13a and a rectangular parallelepiped portion 13b are connected together. The cylindrical portion 13a is the portion that is fitted into the housing 1. The shape of the body portion 13 can be changed depending on the shape of the housing to which the body portion is attached, the shape and number of bus bars that the body portion holds, etc.

[0034] The first nut holding portion 31a extends from the cylindrical portion 13a, and the second nut holding portion 31b, which has the same shape as the first nut holding portion 31a, extends from the rectangular parallelepiped portion 13b.

[0035] The through nut 40 is made of, for example, copper, aluminum, stainless steel, or the like. The through nut 40 has a threaded hole 41 passing therethrough. The through nut 40 is placed on the connecting end 22 so that the threaded hole 41 is adjacent to the threaded through hole 21. The through nut 40 includes a first through nut 40a placed on the first connecting end 22a and a second through nut 40b placed on the second connecting end 22b.

[0036] In the terminal block 10, the first connecting end 22a and the first counter terminal 2 are fastened together by a screw 60. More specifically, the screw 60 passes through the screw through hole 2a and the first screw through hole 21a formed in the first counter terminal 2. The screw 60 further meshes with the first screw groove 42a formed in the first screw hole 41a located adjacent to the first screw through hole 21a. This firmly joins the first connecting end 22a and the first counter terminal 2. The screw 60 may also be threaded into the first extended screw groove 34a.

[0037] The relationship between the second connecting end 22b and the second mating terminal 3 is similar to the relationship between the first connecting end 22a and the second mating terminal 3, and therefore will not be described again.

[0038] <Manufacturing process of terminal block 10> Next, a manufacturing process for the terminal block 10 will be described. Fig. 4 is an explanatory diagram showing the process of molding the resin part 30 of the terminal block 10 together with a mold 50. Fig. 5 is an explanatory diagram showing the positional relationship between the through nut 40 and the screw 60 in a state set in the mold 50. Fig. 6 is a side cross-sectional view showing the mold-molded terminal block 10.

[0039] In the terminal block 10, the resin part 30 is molded using the through nut 40 as an insert part. When manufacturing the terminal block 10, first, the bus bar 20 having the connection end 22 in which the screw through hole 21 is formed and the through nut 40 having the screw hole 41 passing therethrough are prepared. Then, the screw 60 is passed through the screw through hole 21 and screwed into the screw hole 41. The through nut 40 is fixed to the connection end 22.

[0040] At this time, the first screw through hole 21a of the bus bar 20 and the first screw hole 41a of the first through nut 40a are aligned. As shown in FIG. 5 , when viewed from below the first through nut 40a, it is confirmed that the center of the screw 60 and the center of the first screw hole 41a are aligned. Note that in this embodiment, by using the through nut 40, it is possible to confirm the positions of the center of the tip of the screw 60 and the center of the first screw hole 41a. The position of the tip of the screw 60 can be used as a clue to position the screw 60 relative to the first screw hole 41a. If a cap nut were used instead of the through nut 40, it would be impossible to confirm the positions of the center of the screw 60 and the center of the screw hole. Furthermore, even if the positions of the first screw through hole 21a and the outer shape of the cap nut could be confirmed before fastening with the screw 60, the cap nut's screw hole may be eccentric, so the center of the screw may be misaligned with the center of the screw hole of the cap nut. In this regard, in this embodiment, by employing the through nut 40, the first connecting end 22a and the first through nut 40a can be easily aligned.

[0041] The relationship between the second screw through hole 21b and the second screw hole 41b is similar to the relationship between the first screw through hole 21a and the first screw hole 41a, and therefore a description thereof will be omitted.

[0042] With the connection end 22 and the through nut 40 aligned as described above, they are screwed together with the screw 60. Then, the bus bar 20, the through nut 40, and the screw 60 are set in a mold 50. The resin part 30 is molded using the bus bar 20 and the through nut 40 as inserts. At this time, the resin part 30 is molded so as to cover at least a portion of the bus bar 20 and the opening 43 of the screw hole 41 on the opposite side to the connection end 22. In this way, the connection end 22 and the through nut 40 are molded while fixed together with the screw 60, so that the gap between the connection end 22 and the through nut 40 in the molded terminal block 10 is small.

[0043] Furthermore, by fastening the screw 60 to the through nut 40, a gap is less likely to occur between the head of the screw 60 and the connection end 22, and also between the through nut 40 and the connection end 22. Therefore, during molding, resin is less likely to seep into the screw through hole 21. Because the screw 60 is threadedly engaged with the screw hole 41 of the through nut 40, resin is less likely to seep into the screw hole 41 either.

[0044] The mold 50 is composed of an upper mold 50A and a lower mold 50B. For example, the upper mold 50A is butted in the directions of arrows A and B while supporting the bus bar 20, the through nut 40, and the screw 60. When molding using two molds 50, pressure is likely to be applied in a direction perpendicular to the surface where the two molds 50 meet. If the screw 60 were not present, it would be difficult to close the opening of the second screw through hole 21b of the second connecting end 22b. Therefore, in this embodiment, as described above, both the first screw through hole 21a and the second screw through hole 21b can be closed using the screw 60.

[0045] In this embodiment, the screw 60 passes through the screw hole 41 of the through nut 40, and the tip of the screw 60 extends further downward. As a result, the shape of the tip of the screw 60 exposed from the screw hole 41 is molded as the extended screw groove 34 of the resin part 30.

[0046] After the resin portion 30 is molded using a die, the screws 60 are removed from the screw holes 41. This completes the terminal block 10 as a resin molded product shown in FIG.

[0047] The terminal block 10 completed through the manufacturing process described above is formed with the screw 60 threaded into the screw hole 41 of the through nut 40, so that, as shown in Fig. 6, the inner periphery 33 of the extension hole 32 is formed with an extended screw groove 34 that continues to the screw groove 42 of the screw hole 41. The screw groove 42 of the screw hole 41 and the extended screw groove 34 of the resin part 30 form a continuous spiral groove without interruption.

[0048] <Effects of the embodiment> The terminal block 10 configured as described above includes a resin portion 30 that covers at least a portion of the bus bar 20 and a through nut 40. The resin portion 30 has a nut holding portion 31 that holds the through nut 40 in a position overlapping the connecting end 22 while covering the opening 43 of the screw hole 41. The nut holding portion 31 holds the through nut 40 overlapping the connecting end 22. This allows the mating terminal 2 (3) to be easily connected to the connecting end 22 using the screw 60. Furthermore, because the resin portion 30 covers the opening 43 of the through nut 40, it is not necessary to attach a component such as a cap to the opening 43. This reduces the number of components. It also eliminates the need for space for attaching a component such as a cap. This allows the terminal block 10 to be made more compact. The nut holding portion 31 covers the opening 43 of the screw hole 41. This prevents debris generated when the screw 60 is threaded into the through nut 40 from being discharged to the outside. Because the through nut 40 has a threaded hole 41 formed therethrough, the positional relationship between the threaded through hole 21 and the threaded hole 41 can be easily confirmed during manufacturing. This makes it easy to align the connection end 22 and the through nut 40. Furthermore, because the bus bar 20 and the through nut 40 are formed as a single unit by the resin part 30, the task of assembling the nut to the bus bar 20 can be omitted. Furthermore, equipment and jigs for press-fitting the nut, which were previously required to assemble the nut to the bus bar 20, are no longer necessary. Furthermore, the space required for press-fitting the nut is also no longer necessary. This allows the terminal block 10 to be further miniaturized.

[0049] Furthermore, because the through nut 40 is insert-molded into the resin part 30, there is no need to assemble the nut to the resin part or to incorporate a separate part to prevent debris from being discharged to the outside. This also makes it possible to reduce the number of parts and also makes it possible to make the product smaller.

[0050] The resin part 30 also includes an extension hole 32 located on an extension of the screw hole 41 on the opposite side of the screw through hole 21. This allows a space to be provided at the back of the screw hole 41 where the tip of the screw 60 can be positioned and where scraps can be collected. In particular, when the screw 60 is threaded into the through nut 40, metal powder can be generated due to friction between the screw 60 and the through nut 40. This powder can be discharged from the opening 43 of the through nut 40. Since the resin part 30 includes the extension hole 32, the metal powder generated by such friction is contained within the extension hole 32 without flowing out to the outside. This prevents the metal powder from being discharged to the outside.

[0051] Furthermore, an extended screw groove 34 that continues to the screw groove 42 of the screw hole 41 is formed on the inner periphery 33 of the extended hole 32. This allows the screw 60 to be passed through the screw through hole 21 and screwed into the through nut 40 when the resin part 30 is molded, with the tip of the screw 60 protruding from the through nut 45. This allows the resin part 30 to be molded with the through nut 40 firmly fixed in a fixed position on the connecting end 22.

[0052] The nut holding portion 31 also covers the periphery of the through nut 40 and the portion of the through nut 40 opposite the connecting end 22. This ensures insulation between the through nut 40 and surrounding components. Furthermore, because the through nut 40 is no longer exposed to the outside, there is no need to consider plating that takes into account the external exposure environment, improving the degree of freedom in plating the through nut 40.

[0053] Furthermore, the bus bar 20 includes a first connecting end 22a and a second connecting end 22b as connecting ends 22, a bent portion 23 is formed between the first connecting end 22a and the second connecting end 22b of the bus bar 20, the through nut 40 includes a first through nut 40a overlapped on the first connecting end 22a and a second through nut 40b overlapped on the second connecting end 22b, and the resin part 30 includes a first nut holding part 31a that holds the first through nut 40a and a second nut holding part 31b that holds the second through nut 40b as nut holding parts 31. Here, if the overlapping direction of the first through nut 40a relative to the first connecting end 22a and the overlapping direction of the second through nut 40b relative to the second connecting end 22b are the same in the mold 50, it is possible to perform mold molding in a state where resin is prevented from entering the first screw through hole 21a and the second screw through hole 21b when the mold 50 is closed. However, if the bus bar 20 is bent, it may be difficult to press the through nut 40 against the bus bar 20 at both locations. According to the present terminal block 10, the resin portion 30 can be molded using a mold while preventing resin from entering the first screw through hole 21 a and the second screw through hole 21 b at each of the first connection end 22 a and the second connection end 22 b by using the screw 60.

[0054] According to the manufacturing method of the terminal block 10 configured as described above, the screw 60 is passed through the screw through hole 21 and threaded into the screw hole 41 to secure the through nut 40 to the connection end 22. The resin part 30 is molded using the bus bar 20 and the through nut 40 as an insert so as to cover at least a portion of the bus bar 20 and the opening 43 of the screw hole 41 opposite the connection end 22. After the resin part 30 is molded, the screw 60 is removed from the screw hole 41. Because the resin part 30 covers the opening 43 of the screw hole 41 opposite the connection end 22, debris generated when threading the screw 60 into the through nut 40 is less likely to be discharged to the outside. Furthermore, because the through nut 40 has the threaded hole 41 formed therethrough, the positional relationship between the screw through hole 21 and the threaded hole 41 can be easily confirmed during manufacturing. This facilitates alignment of the connection end 22 and the through nut 40. Furthermore, when molding the resin part 30, the screw 60 can be passed through the screw through-hole 21 and screwed into the through-nut 40, with the tip of the screw 60 protruding from the through-nut 40. This allows the resin part 30 to be molded with the through-nut 40 firmly fixed in a fixed position on the connecting end 22.

[0055] <Modifications, etc.> Fig. 7 is an enlarged cross-sectional view showing a portion of the nut holding portion 231 and the through nut 240 according to the modified example. Note that in Fig. 7, the nut holding portion 31 and the through nut 40 according to the embodiment are shown by virtual lines. The through nut 240 according to the modified example has a larger screw hole 241 than the through nut 40 according to the embodiment. Accordingly, the inner periphery 233 and the extended screw groove 234 of the extended hole 232 are also larger than the inner periphery 33 and the extended screw groove 34 of the extended hole 32 according to the embodiment.

[0056] Even if the size of the through nut 240 changes, the outer shape of the resin part 30 does not need to be changed. Therefore, it is possible to accommodate different shapes of the through nut 240 without changing the mold 50 or by making a slight change to the design of the mold 50. The terminal block 10 of the present disclosure can also accommodate changes in the dimensions of the screw 60 to be threaded in this way.

[0057] In the above embodiment, the extension hole 32 may be omitted. In this case, the length of the screw 60 is set to be equal to or smaller than the sum of the thickness of the mating terminal 2 (3), the thickness of the bus bar 20, and the length of the through nut 40.

[0058] In the above embodiment, the resin portion may include a plurality of bus bars 20. In other words, a plurality of the terminal blocks 10 may be connected in series. For example, the terminal block may be configured as a three-pole or six-pole terminal block.

[0059] The terminal block may be used not only as a terminal block for a motor, an inverter, etc., but also as a terminal block for other electrical components, such as a junction box in which relays or fuses inserted in the middle of an electrical circuit are collectively incorporated, or as a terminal block for supporting terminals in equipment for distributing electrical circuits.

[0060] In the above embodiment, each connecting end 22 includes one screw 60 threading structure, but each connecting end 22 may include multiple screw 60 threading structures.

[0061] In the above embodiment, appropriate lightening portions may be formed in each portion of the resin portion 30.

[0062] The configurations described in the above embodiments can be modified as appropriate as long as they are not mutually inconsistent. [Explanation of symbols]

[0063] 1. Housing 1a Terminal block holding hole 2 First mating terminal 2a screw through hole 3 Second mating terminal 10 Terminal block 13 Torso 13a Cylindrical part 13b Rectangular section 14 groove 15 O-ring 20 Busbar 21 Screw through hole 21a First screw hole 21b Second screw through hole 22 Connection end 22a First connection end 22b Second connection end 23 Bend 30 Resin part 31,231 Nut holder 31a First nut holding part 31b Second nut holding part 32,232 extension hole 32a 1st extension hole 32b 2nd extension hole 33,233 Inner circumference 33a 1st inner circumference 33b 2nd inner circumference 34,234 Extended thread groove 34a First extension thread groove 34b Second extension screw groove 40,240 Through Nut 40a First through nut 40b Second through nut 41,241 screw holes 41a First screw hole 41b Second screw hole 42 screw groove 42a 1st screw groove 42b Second screw groove 43 Opening 43a 1st opening 43b 2nd opening 45 Through Nut 50 molds 50A Upper mold 50B Lower mold 60 screws A arrow B arrow

Claims

1. a bus bar having a connection end with a screw through hole formed therein; a resin portion covering at least a portion of the bus bar; a through nut having a threaded hole therethrough; Equipped with The through nut is overlapped on the connection end so that the screw hole is adjacent to the screw through hole, the resin portion has a nut holding portion that holds the through nut in a position overlapping the connection end in a state where the resin portion covers an opening of the screw hole on the opposite side to the connection end, The resin part is molded using the through nut as an insert part. terminal block.

2. 2. The terminal block according to claim 1, The resin portion includes an extension hole located on an extension of the screw hole on the opposite side of the screw through hole. terminal block.

3. 3. The terminal block according to claim 2, An extended screw groove that is continuous with the screw groove of the screw hole is formed on the inner periphery of the extended hole. terminal block.

4. 3. The terminal block according to claim 1 or 2, The nut holding portion covers the periphery of the through nut and a portion of the through nut opposite the connection end. terminal block.

5. 3. The terminal block according to claim 1 or 2, the bus bar includes a first connection end and a second connection end as the connection ends, a bent portion is formed between the first connection end and the second connection end of the bus bar, The through nuts include a first through nut overlapped on the first connecting end and a second through nut overlapped on the second connecting end, The resin part includes a first nut holding part that holds the first through nut and a second nut holding part that holds the second through nut as the nut holding part, terminal block.

6. A bus bar having a connection end with a screw through hole formed therein and a through nut having a screw hole passing therethrough are prepared; a screw is inserted through the screw through-hole and threadedly engaged with the screw hole to fix the through-nut to the connecting end; a resin part is molded using the bus bar and the through nut as an insert part so as to cover at least a portion of the bus bar and an opening of the screw hole on the opposite side to the connection end; After the resin portion is molded, the screw is removed from the screw hole. Terminal block manufacturing method.

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