JP4811374B2 - Terminal connection structure - Google Patents

Description

  The present invention relates to a terminal connection portion structure, and more particularly to a connection portion structure for connecting an internal terminal disposed inside an apparatus and an external terminal disposed outside.

Conventionally, a terminal connecting portion as shown in FIG. 5 is known. The conductive portion 3 penetrates the resin terminal block 2 attached to the attachment portion 1 made of a casing or the like of the electronic device, and the external terminal 5 is connected to the upper end of the conductive portion 3 using a bolt 4. An internal terminal 7 is connected to the lower end of 3 using a bolt 6. Thus, the cable 8 connected to the external terminal 5 on the outside of the attachment portion 1 and the cable 9 connected to the internal terminal 7 on the inside of the attachment portion 1 are electrically connected to each other via the conductive portion 3. The
Further, as shown in FIG. 6, the external terminals 5 and 10 are threaded by screwing nuts 11 and 12 into male screw portions 10 a and 10 b formed to protrude from the upper end and the lower end of the conductive portion 10 that penetrates the terminal block 2. A terminal connection portion having a structure for connecting the internal terminal 7 to the conductive portion 10 is also used.

However, in each of the terminal connection portions described above, the bolt 6 or the nut 12 is positioned inside the mounting portion 1. Therefore, when retightening the bolt 6 or the nut 12 to prevent loosening during maintenance or the like, This device needs to be disassembled, and maintenance takes time and effort.
Further, as shown in FIG. 5 or FIG. 6, when a built-in part of the electronic device or a wall W of the casing is positioned in the vicinity of the bolt 6 or the nut 12 inside the mounting portion 1, the bolt 6 or the nut 12 is tightened. Since there is no space for inserting the electric tool or the like, there is a problem that the assembling work is difficult.

  Further, for example, Patent Document 1 also discloses a connection portion structure that connects between both terminals by fixing the terminals with screws corresponding to the upper side and the lower side of the pipe-like screw that penetrates the terminal block, respectively. Yes.

JP 7-298543 A

  Also in the connection part structure of this patent document 1, like the terminal connection part shown in FIG.5 or FIG.6, there existed a problem that an assembly operation | work was difficult while it took a labor and time for a maintenance.

  The present invention has been made to solve such problems, and it is an object of the present invention to provide a terminal connection portion structure that can facilitate maintenance and improve assembly.

  The terminal connection part structure according to the present invention is a connection part structure for electrically connecting an internal terminal arranged inside an apparatus and an external terminal arranged outside, to a main body part attached to the apparatus and the main body part. An internal terminal accommodating portion for accommodating an internal terminal between the main body portion and the opposing portion, the internal terminal accommodating portion and the device being formed in the main body portion. A terminal block in which a communication hole is formed to communicate with the outside of the terminal block, and a holding part for holding one of the bolt and the nut so as not to rotate is formed in the opposing part, and one end is located in the internal terminal accommodating part. And a conductive portion inserted into the communication hole of the terminal block so that the other end faces the outside of the device and having a through hole formed between the one end and the other end, and one end of the conductive portion in the internal terminal accommodating portion When the internal terminal is accommodated between the terminal block and the opposing part of the terminal block With the external terminal in contact with the other end of the conductive part, a bolt is passed through the through hole of the conductive part, and one of the bolts and nuts held by the holding part of the terminal block from the outside of the device By fastening the other of the bolt and nut, the internal terminal and the external terminal are electrically connected through the conductive portion.

A polygonal concave portion for inserting and engaging the head of the bolt can be formed as a holding portion in the opposing portion of the terminal block.
Moreover, a nut can also be embedded and fixed to the holding part of the opposing part of a terminal block.

  According to this invention, it is possible to facilitate the maintenance and improve the assembling property.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
Embodiment 1 FIG.
FIG. 1 shows a terminal connection portion structure according to Embodiment 1 of the present invention. A main body portion 22 of the terminal block 21 is attached to an attachment portion 1 made of a casing or the like of an electronic device. The main body 22 of the terminal block 21 is connected to a facing portion 23 that is located on the inner side of the mounting portion 1 with respect to the main body 22 and faces the main body 22. The internal terminal 7 is inserted and accommodated in the internal terminal accommodating portion 24 formed therebetween.

  A communication hole 25 is formed in the main body portion 22 of the terminal block 21 so as to communicate the internal terminal accommodating portion 24 and the outside of the mounting portion 1, and a cylindrical conductive portion 26 made of copper or the like is formed in the communication hole 25. Has been inserted. The lower end of the conductive portion 26 protrudes into the internal terminal accommodating portion 24 and comes into contact with the internal terminal 7, and the upper end of the conductive portion 26 protrudes outside the attachment portion 1, and is between the upper end and the lower end of the conductive portion 26. A through hole is formed. In addition, the external terminal 5 is disposed so as to contact the upper end of the conductive portion 26. The facing portion 23 of the terminal block 21 is formed with a concave portion 27 as a holding portion on a surface opposite to the surface facing the main body portion 22. The facing portion 23 has the concave portion 27 and an internal terminal accommodating portion. A through-hole communicating with 24 is formed. Further, the internal terminal 7 and the external terminal 5 are also formed with through holes, respectively.

  A bolt 28 having a hexagonal head is passed through the recess 27 and the through hole of the facing portion 23 of the terminal block 21 from the inside of the mounting portion 1, and each of the internal terminal 7, the conductive portion 26 and the external terminal 5. The external terminal 5, the conductive portion 26 and the internal terminal 7 are integrally connected to each other by a nut 29 being fastened to the tip of the bolt 28 protruding through the through hole and projecting to the outside of the attachment portion 1. Thus, the cable 8 connected to the external terminal 5 on the outside of the attachment portion 1 and the cable 9 connected to the internal terminal 7 on the inside of the attachment portion 1 are electrically connected to each other via the conductive portion 26. It is connected.

Further, the head of the bolt 28 is located in the concave portion 27 of the facing portion 23 of the terminal block 21, but the concave portion 27 of the facing portion 23 corresponds to the head of the bolt 28 as shown in FIG. It has a hexagonal shape. When the head of the bolt 28 is inserted into the recess 27, the head of the bolt 28 engages with the inner wall surface of the recess 27, thereby inhibiting the rotation of the bolt 28 about the axis.
The terminal block 21 is formed from an insulating resin or the like.

  When the terminal connection portion is assembled, the internal terminal 7 is inserted and accommodated in the internal terminal accommodating portion 24 of the terminal block 21, and the conductive portion 26 is inserted into the communication hole 25 of the main body portion 22 of the terminal block 21, and its lower end Is brought into contact with the internal terminal 7 in the internal terminal accommodating portion 24, and the external terminal 5 is brought into contact with the upper end of the conductive portion 26. In this state, the bolt 28 is inserted into the concave portion 27 of the facing portion 23 of the terminal block 21 from the inside of the mounting portion 1 and passed through the through hole of the facing portion 23, and the internal terminal 7, the conductive portion 26 and the external terminal 5 By sequentially passing through each through-hole, the tip of the bolt 28 protrudes to the outside of the mounting portion 1 and the head of the bolt 28 is inserted into the recess 27 of the facing portion 23. Furthermore, by fastening a nut 29 to the tip of the bolt 28, the external terminal 5, the conductive portion 26, and the internal terminal 7 are connected together. As a result, the external terminal 5 and the internal terminal 7 are electrically connected via the conductive portion 26.

In the terminal connection portion structure having the above-described configuration, the bolt 28 is held so as not to rotate by being inserted into the recess 27 formed in the facing portion 23 of the terminal block 21. The nut 29 can be screwed and fastened to the tip of the bolt 28 located outside the mounting portion 1, whereby the external terminal 5, the conductive portion 26 and the internal terminal 7 are integrally connected to each other electrically. Can be connected.
Therefore, by retightening the nut 29 positioned outside the attachment portion 1 with respect to the bolt 28 during maintenance or the like, the connection state of both the external terminal 5 and the internal terminal 7 to the conductive portion 26 can be strengthened again. Thus, it is possible to prevent a connection failure or the like of the external terminal 5 and the internal terminal 7 due to the looseness of the nut 29 to the conductive portion 26. Thus, maintenance can be performed easily.

Further, since the external terminal 5, the conductive portion 26 and the internal terminal 7 can be connected at a time by a set of bolts 28 and nuts 29, the conductive portion of the conductive portion can be connected using two bolts or two nuts as in the conventional case. Compared with the case where the external terminal 5 and the internal terminal 7 are connected to the upper end and the lower end, respectively, the assembly man-hour can be reduced.
Further, as shown in FIG. 1, even when a built-in component of an electronic device or a wall W of a casing is located near the lower portion of the facing portion 23 of the terminal block 21, the tip of the bolt 28 positioned outside the mounting portion 1. In addition, the nut 29 can be fastened using an electric tool or the like, whereby the assembling work can be performed easily and in a short time.
In this way, the assembling property can be improved.

Embodiment 2. FIG.
Next, with reference to FIG. 3, the terminal connection part structure which concerns on Embodiment 2 of this invention is demonstrated. The second embodiment includes a communication hole 25 formed in the main body portion 22 of the terminal block 21 and a conductive portion 31 inserted into the communication hole 25 in the terminal connection portion structure of the first embodiment shown in FIG. An O-ring 32 is disposed between the two. Here, an annular housing groove is formed in the outer peripheral portion of the conductive portion 31. When the conductive part 31 is inserted into the communication hole 25 of the main body part 22 of the terminal block 21 with the O-ring 32 attached to the receiving groove of the conductive part 31, the O-ring 32 is formed on the inner wall of the communication hole 25 of the main body part 22. Waterproofness is ensured by abutting, thereby preventing water from entering the inside of the attachment portion 1.

  In the first and second embodiments described above, bolts having other polygonal heads may be used instead of the bolts 28 having hexagonal heads. In that case, the recess 27 of the terminal block 21 is also formed in a polygonal shape corresponding to the head of the bolt, and the bolt head is inserted into the recess 27 so that rotation around the axis of the bolt is prohibited. be able to.

Embodiment 3 FIG.
Next, a terminal connection portion structure according to Embodiment 3 of the present invention will be described with reference to FIG. In the third embodiment, in the terminal connection portion structure of the first embodiment shown in FIG. 1, the cap nut 43 is not rotated by the facing portion 42 of the terminal block 41 instead of holding the bolt 28 so as not to rotate. It is something to hold. That is, the terminal block 41 includes a main body 22 attached to the attachment portion 1 and a facing portion 42 connected to the main body 22 so as to face the main body 22, and a cap nut 43 is provided in the facing portion 42. It is buried and rotation around its axis is prohibited. A portion of the facing portion 42 where the cap nut 43 is embedded functions as a holding portion.

  The cap nut 43 has a substantially hemispherical cap formed at one end in the axial direction thereof, and is arranged so that the other end in the axial direction of the cap nut 43 not provided with the cap faces the main body portion 22. Has been. Further, a through hole communicating with the other end of the cap nut 43 in the axial direction is formed on the surface of the facing portion 42 facing the main body portion 22.

  The internal terminal 7 is inserted and accommodated in the internal terminal accommodating portion 24 formed between the main body portion 22 and the facing portion 42 of the terminal block 41, and the conductive portion 26 is inserted into the communication hole 25 of the main body portion 22 of the terminal block 41. And the lower end thereof is brought into contact with the internal terminal 7 in the internal terminal accommodating portion 24, and the external terminal 5 is brought into contact with the upper end of the conductive portion 26. In this state, the bolt 28 is passed through the through holes of the external terminal 5, the conductive part 26 and the internal terminal 7 in order from the outside of the mounting part 1, and the tip of the bolt 28 is inserted into the through hole of the facing part 42. By fastening to the nut 43, the external terminal 5, the conductive portion 26, and the internal terminal 7 are integrally connected to each other. As a result, the external terminal 5 and the internal terminal 7 are electrically connected via the conductive portion 26.

  Here, since the cap nut 43 is embedded in the facing portion of the terminal block 41 and held so as not to rotate, the bolt 28 is rotated by operating the head of the bolt 28 located outside the mounting portion 1. Thus, the tip of the bolt 28 can be screwed and fastened to the cap nut 43, whereby the external terminal 5, the conductive portion 26, and the internal terminal 7 can be integrally connected and electrically connected to each other. .

Therefore, both the external terminal 5 and the internal terminal 7 for the conductive portion 26 are operated by operating the head of the bolt 28 positioned outside the attachment portion 1 during maintenance or the like and retightening the bolt 28 with respect to the cap nut 43. The connection state can be strengthened again.
Further, the external terminal 5, the conductive portion 26 and the internal terminal 7 can be connected at a time by a set of bolts 28 and cap nuts 43, and as shown in FIG. Even when a built-in part of the electronic device or a wall W of the casing is located near the lower part, the bolt 28 can be fastened to the cap nut 43 from the outside of the mounting portion 1 with an electric tool or the like, so that the assembly is easy and Therefore, the maintenance can be easily performed and the assembling property can be improved as in the above-described embodiment.

  In addition, in the third embodiment, since the cap nut 43 is embedded in the facing portion 42 of the terminal block 41, the gap between the facing portion 42 of the terminal block 41 and the built-in component of the electronic device or the wall W of the casing, etc. Even if only a few are formed, the bolt 28 can be fastened to the cap nut 43 from the outside of the mounting portion 1 and the assembly can be performed, and the electronic device can be miniaturized.

  In the third embodiment, as in the terminal connection portion structure of the second embodiment, a conductive portion having an O-ring attached to the outer peripheral portion is inserted into the communication hole 25 of the main body portion 22 of the terminal block 41. You can also. If comprised in this way, waterproofness will be ensured with an O-ring, and it will prevent that water permeates into the inside of the attachment part 1. FIG.

In addition, the conductive parts 26 and 31 in the above-described first to third embodiments can be formed of aluminum instead of copper.
Further, the bolt 28, the nut 29, and the cap nut 43 may be made of metal or may be made of resin or the like.
Moreover, although the main-body part 22 and the opposing part 23 of the terminal block 21 and the main-body part 22 and the opposing part 42 of the terminal block 41 were mutually integrally molded, the main-body part 22 and the opposing parts 23 and 42 are separate parts. The terminal blocks 21 and 41 can also be formed by connecting them together using bolts or the like.

The present invention can be applied to terminal connection portions of motors and other various electronic devices.
Further, the present invention can be applied to various terminal connection portions such as a terminal connection portion for power supply and a terminal connection portion for signal transmission.
For example, in an inverter main circuit having a three-phase configuration, three internal terminals corresponding to three phases and three external terminals can be connected using the terminal connection structure of the present invention.

It is sectional drawing which shows the terminal connection part structure which concerns on Embodiment 1 of this invention. FIG. 3 is a perspective view showing a terminal block in the first embodiment. FIG. 6 is a cross-sectional view showing a terminal connection part structure according to a second embodiment. 6 is a cross-sectional view showing a terminal connection part structure according to Embodiment 3. FIG. It is sectional drawing which shows the conventional terminal connection part structure. It is sectional drawing which shows another conventional terminal connection part structure.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Mounting part, 5 External terminal, 7 Internal terminal, 8, 9 Cable, 21, 41 Terminal block, 22 Main part, 23, 42 Opposing part, 24 Internal terminal accommodating part, 25 Communication hole, 26, 31 Conductive part, 27 Recess, 28 bolt, 29 nut, 32 O-ring, 43 cap nut, W wall.

Claims (3)

In the structure of the connection part that electrically connects the internal terminal arranged inside the device and the external terminal arranged outside,
An internal terminal for housing the internal terminal between the main body portion and the facing portion, having a main body portion attached to the device and a facing portion coupled to the main body portion so as to face the main body portion A holding portion is formed, a communication hole is formed in the main body portion to communicate the internal terminal accommodating portion and the outside of the device, and holding for holding one of the bolt and the nut so as not to rotate in the facing portion. A terminal block formed with a section;
A conductive portion having one end positioned in the internal terminal accommodating portion and the other end facing the outside of the device, inserted into the communication hole of the terminal block and having a through hole formed between the one end and the other end The internal terminal is accommodated between the one end of the conductive portion and the opposing portion of the terminal block in the internal terminal accommodating portion, and the external terminal is brought into contact with the other end of the conductive portion. The bolt is passed through the through-hole of the conductive portion in a state where the other end of the bolt and nut from the outside of the device with respect to one of the bolt and nut held by the holding portion of the terminal block. The terminal connection part structure is characterized in that the internal terminal and the external terminal are electrically connected through the conductive part by fastening the terminal.   2. The terminal connection part structure according to claim 1, wherein a polygonal recess for inserting and engaging the head of the bolt is formed in the facing part of the terminal block as the holding part.   The terminal connection portion structure according to claim 1, wherein the nut is embedded and fixed in the holding portion of the facing portion of the terminal block.

Images