JP5092034B2 - Terminal block and method for manufacturing terminal block - Google Patents

Description

  The present invention relates to a terminal block and a method for manufacturing the terminal block.

  As a conventional terminal block, there is a type in which a nut is embedded in an insulating resin base portion of a terminal block, and a screw terminal is screwed into the nut to fix a crimp terminal crimped to an end of an external connection line (for example, Patent Document 1). The terminal block for insert-molding the nut needs to hold the nut with a support portion provided in the mold at the time of resin molding, and a hole that is a trace of the support portion being pulled out is formed below the nut after molding. When fixing this terminal block to the metal base, if the nut is made of metal, the bottom surface of the metal nut is exposed in the hole and faces the metal base. A necessary insulation distance is provided between the nut and the nut.

JP 2003-109686 A

  The conventional terminal block is configured as described above, and a necessary insulation distance must be ensured between the metal base and the nut. For this reason, there existed a problem that it became the hindrance of the size reduction of a terminal block. Note that the reduction in height is a concept of reducing the thickness (height) of components and the like. In particular, in a terminal block used for an electric device or the like mounted on a vehicle such as an automobile, a reduction in height is an important issue. Also, when the screw is screwed into the nut and tightened, if wear powder or the like is generated by screwing the nut and screw and falls into the hole, the insulation distance between the nut and the metal base provided according to the applied voltage As a result, there is a problem that dielectric breakdown may occur. Of course, if a cap nut made of a conventional metal block is used, the problem of falling of wear powder etc. can be prevented, but the height of the nut becomes high and there is a sufficient margin between it and the metal base as described above. Therefore, it is impeded to reduce the height of the product.

  The present invention has been made to solve the above-described problems, and it is an object of the present invention to obtain a terminal block that can secure insulation performance and reduce the height of the terminal and to provide a method for manufacturing the terminal block. And

In the terminal block according to the present invention,
A terminal block having a resin base and a cap nut device,
The resin base is formed of an insulating resin and has a base end and a hole,
The cap nut device includes a female screw member made of a conductive material having a female screw portion and a plate-like member made of an insulating material, and the plate-like member is disposed at one end in the length direction of the female screw portion of the female screw member. Is fixed,
The cap nut device is embedded in the resin base so that the plate-like member is located closer to the base end than the female screw member, and the hole starts from the plate-like member and the base end To open.

Moreover, the manufacturing method of the terminal block which concerns on this invention has the following process.
A. A cap nut device manufacturing step of manufacturing a cap nut device by fixing a plate-shaped member made of an insulating material to one end portion of the female screw portion in the length direction of the female screw member made of a conductive material having a female screw portion.
A. A support step of supporting the cap nut device on the support portion such that the plate-like member is closer to the support portion provided on the mold than the female screw member.
C. A resin base manufacturing process for injecting an insulating resin into the mold and manufacturing a resin base in which the cap nut device is embedded.
D. A mold release step in which the resin base is released from the mold, and the trace of the support part being removed from the resin base becomes a hole that opens from the plate member to the base end of the resin base. .

In the terminal block according to the present invention,
A terminal block having a resin base and a cap nut device,
The resin base is formed of an insulating resin and has a base end and a hole,
The cap nut device includes a female screw member made of a conductive material having a female screw portion and a plate-like member made of an insulating material, and the plate-like member is disposed at one end in the length direction of the female screw portion of the female screw member. Is fixed,
The cap nut device is embedded in the resin base so that the plate-like member is located closer to the base end than the female screw member, and the hole starts from the plate-like member and the base end Because it opens to
It is possible to obtain a terminal block that can ensure insulation performance and reduce the height of the back.

Moreover, since the manufacturing method of the terminal block which concerns on this invention has the following process, it can provide the manufacturing method of the terminal block which can ensure insulation performance and can make height low.
A. A cap nut device manufacturing step of manufacturing a cap nut device by fixing a plate-shaped member made of an insulating material to one end portion of the female screw portion in the length direction of the female screw member made of a conductive material having a female screw portion.
A. A support step of supporting the cap nut device on the support portion such that the plate-like member is closer to the support portion provided on the mold than the female screw member.
C. A resin base manufacturing process for injecting an insulating resin into the mold and manufacturing a resin base in which the cap nut device is embedded.
D. A mold release step in which the resin base is released from the mold, and the trace of the support part being removed from the resin base becomes a hole that opens from the plate member to the base end of the resin base. .

It is a figure which shows the structure of the terminal block which is Embodiment 1 of this invention.

Embodiment 1 FIG.
FIG. 1 shows a first embodiment for carrying out the present invention. FIG. 1 (a) is a plan view of a terminal block, and FIG. 1 (b) is a cross-sectional view of a main part showing a main part of the terminal block. It is. In FIG. 1, the terminal block 1 is configured as follows, and is fixed to, for example, a metal base 4 (FIG. 1A) with a fixing screw (not shown). The resin base 11 made of insulating resin has a flat bottom surface portion 11a as an end portion of the base, and is attached by contacting the bottom surface portion 11a with, for example, a metal base 4 of a device in which the terminal block 1 is used. It is done. A cap nut device 12 (described later) is integrally formed on the resin base 11 by insert molding. The resin base 11 has a hole that is a trace of a lower mold support (not shown) that supports the cap nut device 12 at the time of insert molding on the lower side of the cap nut device 12 in FIG. 11b. The hole portion 11b starts from the insulating disk 14 and opens to the bottom surface portion 11a of the resin base 11.

  The cap nut device 12 includes a metal nut portion 13 as a female screw member, and an insulating disc 14 as an insulating member as a separate member, and a bag portion 12a is formed by both of them. Yes. The nut portion 13 has a hexagonal shape with a flange as shown in a cross section in FIG. 1 (b), and a female screw portion 13 a into which a later-described fastening screw 16 is screwed is provided. Further, the nut portion 13 is an engaging portion protruding from the lower end portion of the nut portion 13 in FIG. 1B, which is one end portion in the length direction of the female screw portion 13a, that is, the height direction of the nut portion 13. The four claw-shaped caulking portions 13b are provided.

  The insulating disk 14 is fitted to the caulking portion 13 b of the nut portion 13 so as to cover the female screw portion 13 a in the height direction, and is caulked and integrated with the nut portion 13. In addition, the flange, which is the other end of the nut portion 13, is insert-molded integrally with the resin base 11 so that the upper surface of the flange is substantially flush with the upper surface of the resin base 11. Then, the crimping screw 5 is screwed onto the female threaded portion 13a of the nut portion 13 with the washer 17 fitted, and the crimping terminal 5 is crimped to the end of the connection line from the outside by the clamping screw 16 (FIG. 1A). Is omitted). The terminal block 1 is composed of the resin base 11, the cap nut device 12, the fastening screw 16 and the washer 17.

  Next, a method for manufacturing the terminal block 1 will be described. First, the cap nut device 12 is manufactured. Four engaging portions projecting from the lower end in FIG. 1 (b), which is one end in the height direction of a hexagonal nut portion 13 with a metal flange having a female screw portion 13a. The insulating disk 14 is fitted inside the claw-shaped crimped portion 13b, and the crimped portion 13b is pressed and plastically deformed by a crimping jig (not shown) to integrally crimp the insulating disk 14. Thereby, the cap nut apparatus 12 is completed. The process for manufacturing the cap nut device 12 can be performed by an automatic machine.

  Next, the completed cap nut device 12 is mounted and fixed on a support portion provided at a predetermined position of a lower mold (not shown). Thereafter, the upper mold is placed, the mold is closed, and an insulating resin is cast and solidified to mold the resin base 11 and the cap nut device 12 is embedded and integrated into the resin base 11. Remove the table 1 from the mold. Thereby, the edge part of the height direction of the nut part 13 is covered with resin including the crimping part 13b. Further, the resin base 11 is formed with a hole portion 11b which is a trace of the lower mold supporting portion that supports the cap nut device 12 being removed. The hole portion 11b starts from the insulating disk 14 and opens to the bottom surface portion 11a of the resin base 11. The mold has a dimensional relationship in which the upper surface of the flange of the nut portion 13 in FIG. 1B is flush with the upper surface of the resin base 11. Of course, the above process can be automated.

  In the above-described embodiment, the cap nut device 12 is shown by caulking the outer peripheral portion of the insulating disc 14 by the caulking portion 13 b of the nut portion 13, but the insulating disc 14 is placed below the nut portion 13. Since it is sufficient if it can be fixed, it may be fixed to the engaging portion provided in the nut portion 13 by other methods such as press-fitting, pressure bonding, and heat caulking. Moreover, although the nut part 13 showed the hexagonal thing with a flange, the cylindrical nut etc. which gave the knurl process to the outer peripheral part and formed the thin groove-shaped part in the axial direction may be sufficient. Of course, it is not essential to make the nut portion flanged.

  For example, as shown in FIG. 1A, the terminal block 1 configured as described above is fixed by bringing the bottom surface portion 11a into contact with the metal base 4 made of metal with a fixing screw (not shown). At this time, since the cap nut device 12 has the insulating disk 14 in the lower portion, the metal nut portion 13 is not exposed in the hole portion 11b connected to the metal base 4, so the nut portion 13 and the metal Insulation with the base 4 can be easily performed, and the insulation distance can be shortened. Accordingly, the vertical dimension of the hole 11b in FIG. 1B can be shortened, and the height of the terminal block 1 can be reduced, that is, the height can be reduced.

  Moreover, since the insulating disc 14 was provided in the edge part of the nut part 13 and the bag nut apparatus 12 was comprised, the metal fragment | piece, grinding | polishing, and abrasion powder generate | occur | produced from the nut part 13 and the fastening screw 16 which are electrically conductive members. Furthermore, since it remains in the bag portion 12a, it is possible to prevent dielectric breakdown without adding a structural member, and the quality and reliability of the terminal block are improved. Moreover, since the cap nut apparatus 12 is used, the assembly property can be improved and the cost can be reduced.

  Furthermore, since the cap nut device 12 is insert-molded, it is not necessary to provide a mold structure that does not allow the insulating resin to enter the female screw part 13a from the bottom surface of the nut part 13, and the mold structure and the molding process are simplified. Therefore, the manufacturing cost of the terminal block can be reduced. Further, since the cap nut device 12 is insert-molded after the cap nut device 12 is manufactured, the work is performed as compared with the case where the nut portion 13 and the insulating disc 14 are individually placed in the mold and then insert-molded. It is easy to automate. Moreover, the cap nut apparatus 12 comprised with the nut part 13 and the insulating disc 14 which is a member different from this nut part 13 is compared with the general metal cap nut manufactured with a perforated hole with one metal block. Thus, the terminal block in which the cap nut device 12 is insert-molded can be reduced in size and height, and in particular, for use in a vehicle, for example, power conversion for converting battery power into alternating current. It becomes the most suitable as a terminal block of the device.

1 terminal block, 11 resin base, 11a bottom surface, 11b hole,
12 cap nut device, 13 nut part, 13a female thread part, 13b caulking part,
14 Insulating disc.

Claims (4)

A terminal block having a resin base and a cap nut device,
The resin base is formed of an insulating resin and has a base end and a hole,
The cap nut device includes a female screw member made of a conductive material having a female screw portion and a plate-like member made of an insulating material, and the plate-like member is disposed at one end in the length direction of the female screw portion of the female screw member. Is fixed,
The cap nut device is embedded in the resin base so that the plate-like member is located closer to the base end than the female screw member, and the hole starts from the plate-like member and the base end A terminal block that opens to the end. In the cap nut device, the female screw member has an engaging portion, and the plate-like member is fixed to the engaging portion by any one of caulking, heat caulking, press-fitting, and crimping. The terminal block according to claim 1, which is integrated. A manufacturing method of a terminal block having the following steps.
A. A cap nut device manufacturing step of manufacturing a cap nut device by fixing a plate-shaped member made of an insulating material to one end portion of the female screw portion in the length direction of the female screw member made of a conductive material having a female screw portion.
A. A support step of supporting the cap nut device on the support portion such that the plate-like member is closer to the support portion provided on the mold than the female screw member.
C. A resin base manufacturing process for injecting an insulating resin into the mold and manufacturing a resin base in which the cap nut device is embedded.
D. A mold release step in which the resin base is released from the mold, and the trace of the support part being removed from the resin base becomes a hole that opens from the plate member to the base end of the resin base. . The said cap nut apparatus manufacturing process fixes the said plate-shaped member to the said internal thread member by any one method of caulking, heat caulking, press-fitting, and crimping | combination, The manufacture of the terminal block of Claim 3 Method.

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