JP2017162950A - Transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transformer which can easily position a terminal, and thus can shorten and simplify assembling work.SOLUTION: A transformer is equipped with a bobbin 1 integrally molded with a terminal stand 3 on which a plurality of terminals 4a and 4b are planted on an outer peripheral portion of a flange 2; a secondary coil 5 wound around a winding portion of the bobbin 1 and fastened to the terminal 4b at both end portions; a U-shaped primary coil 6 externally fitted with an outer periphery of the secondary coil 5 through an insulation layer 5a and drawn out in the same direction as the terminal at both end portions 6a; and a base member 7 made from insulation resin covering an outer periphery of the primary coil 6. The base member 7 has a pair of side plates 8 interposed between the primary coil 6 and a core 15; a first hole portion 11 integrally molded between the side plates 8 and in which each end portion 6a of the primary coil 6 is inserted; and a bottom plate 9 formed with a second hole portion 13 in which the terminal 4a positioned at an end portion in an aligning direction is inserted.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a transformer used as an in-vehicle power transformer or a current transformer.

  FIG. 8 shows a conventional transformer of this type. A primary in which a metal plate such as a copper plate is bent in a U-shape around an outer periphery of a bobbin 21 around which a secondary coil 20 is wound via an insulating tape 20a. A coil 22 is sheathed, and a U-shaped insulating cap 23 covering the primary coil 22 is provided on the outer periphery of the primary coil 22, and a pair of E-shaped cores 24 insulate the outer legs 24 a from each other. Are integrated with a tape (not shown) wound around the outer periphery of the middle leg 24b inserted into the bobbin 21.

  In the transformer, the terminal block 26 in which the terminals 25 are implanted on the outer peripheral portion of the flanges at both ends of the bobbin 21 is integrally formed, and the end of the secondary coil 20 is entangled with the terminals 25. The terminal portions 22a at both ends of the primary coil 22 are drawn in the same direction as the terminals 25, and the terminals 25 and the terminal portions 22a are inserted into connection holes of a circuit board (not shown) and connected by brazing or the like. It is mounted on the circuit board.

  In the transformer having the above-described configuration, it is important to position the terminal portion 22a of the primary coil 22 that becomes a free end during manufacturing for mounting on a circuit board. For this reason, after positioning the terminal portion 22a of the primary coil 22 with a jig or the like, the primary coil 22 is bonded and fixed, and this assembly work requires a lot of labor and skill. there were.

Further, since it is necessary to maintain the positional accuracy of the terminal portion 22a after the manufacture and until it is mounted on the circuit board, it is necessary to manage the accuracy of the terminal portion 22a during storage and transportation. There was a problem.
As a transformer in which a primary coil and a secondary coil are housed in an insulating case and a core is disposed on the outer periphery thereof, for example, a transformer disclosed in Patent Document 1 below is known.

JP 2003-92224 A

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a transformer capable of easily positioning terminals and thus shortening and simplifying assembly work. It is what.

  In order to solve the above-mentioned problem, a transformer according to the present invention as set forth in claim 1 is provided with a plurality of terminals in a direction along the end face at the outer peripheral portion of the flange and the flange is integrally formed at both ends of the winding portion. A bobbin integrally formed with a terminal block implanted at intervals, a secondary coil wound around the winding portion of the bobbin and having both ends entangled with the terminal, and the secondary A primary coil made of a U-shaped metal plate that is sheathed on the outer periphery of the coil via an insulating layer and whose both ends are drawn out in the same direction as the terminal, and a base made of an insulating resin that covers the outer periphery of the primary coil Comprising a member and a core that surrounds the outer periphery of the base member to form a closed magnetic path, and the base member includes a pair of side plates interposed between the primary coil and the core; The secondary coil is integrally formed between these side plates. A bottom plate that covers the outer periphery and has a first hole through which each end of the primary coil is inserted, and a second hole through which the terminal located at the end in the alignment direction is inserted. It is characterized by.

  According to a second aspect of the present invention, in the first aspect of the present invention, the guide wall for guiding the primary coil protrudes on both sides of the primary coil on the inner surface of the side plate of the base member. Is formed.

  Furthermore, the invention described in claim 3 is the invention described in claim 1 or 2, wherein the terminal inserted through the second hole is a dummy terminal. The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the base member is engaged with both end portions of the terminal block of the bobbin at the corners of the bottom plate of the base member. A claw portion for connecting the member and the bobbin is formed.

  According to the invention according to any one of claims 1 to 4, the first hole and the second hole are formed in the bottom plate of the base member interposed between the primary coil and the core, and Each end portion of the primary coil is inserted into the first hole portion, and a terminal located at the end portion in the alignment direction of the terminal block of the bobbin is inserted into the second hole portion, so that it becomes a terminal portion. The relative positioning between the end of the primary coil and the terminal of the secondary coil can be easily performed with high accuracy. As a result, the assembly work can be shortened and simplified.

  Further, when a U-shaped metal plate is used as the primary coil, the primary coil may move in the axial direction on the outer periphery of the secondary coil. However, in the invention according to claim 2, Since the guide walls projecting on both sides of the primary coil are formed on the inner side surface of the side plate of the base member, the movement of the primary coil can be prevented by the guide wall.

  In addition, when a plurality of primary coils are arranged in parallel, it is possible to prevent the adjacent primary coils from being in electrical contact by the guide wall.

  In the invention according to claim 3, since the dummy terminal in which the end of the secondary coil is not entangled is used as the terminal inserted into the second hole of the bottom plate of the base member, The bottom plate can be directly brought into contact with the terminal block for assembly, so that the height can be further reduced when mounted.

  Further, according to the invention described in claim 4, since the claw portions formed at the corner corners of the bottom plate of the base member are engaged with both end portions of the terminal block of the bobbin and both are connected, It is possible to prevent the positional deviation from occurring at the terminals and the end portions of the primary coil during transport and handling from the time when the transformer is manufactured to when it is mounted, thereby facilitating accuracy management.

It is a disassembled perspective view which shows one Embodiment of the trans | transformer of this invention. It is a front view after the assembly of the transformer of FIG. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. FIG. 3 is a bottom view of FIG. 2. It is the B section enlarged view of FIG. It is a perspective view which shows the base member of FIG. It is a perspective view which expands and shows the vicinity part of the terminal block of FIG. It is a disassembled perspective view which shows the conventional transformer.

  1 to 7 show an embodiment of a transformer of the present invention, and reference numeral 1 in the figure denotes a bobbin. In this bobbin 1, flanges 2 are integrally formed at both end portions of a winding portion formed in a rectangular tube shape having a substantially rectangular cross section, and the outer peripheral portion on the short side of both flanges 2 is in a direction along the end surface. The extending terminal block 3 is integrally formed, and the upper surface of the terminal block 3 is formed on the same surface as the inner peripheral surface of the winding portion.

  On the other hand, a plurality (six in the figure) of terminals 4a and 4b are planted in a straight line on the lower surface of each terminal block 3, and the terminals are planted at both ends in the alignment direction. 4a is a dummy terminal. And the secondary coil 5 is wound around the outer periphery of the winding part, and the end part is entangled with the terminal 4b of the terminal block 3, respectively. Here, an insulating tape 5 a is wound around the outer periphery of the secondary coil 5, and two primary coils 6 are disposed on the outer periphery thereof.

  These primary coils 6 are each formed by bending a strip-shaped copper plate in an out-of-plane direction into a U-shape, and are arranged on the outer periphery of the secondary coil 5 (insulating tape 5a) with a gap in the axial direction. Has been. Moreover, each primary coil 6 is arrange | positioned so that the outer periphery of the said secondary coil 5 (insulation tape 5a), Comprising: The outer periphery of a pair of long side part and the short side part adjacent to this may be covered. The terminal portions 6 a at both ends are drawn out in the same direction as the terminals 4 a and 4 b between the terminal blocks 3.

  A base member 7 is disposed on the outer periphery of the primary coil 6 so as to cover the pair of long side portions. The base member 7 includes a pair of side plates 8 that cover the long side portion of the primary coil 6, and a bottom plate 9 that is integrally formed between one end portions of the side plates 8 and is inserted between the terminal blocks 3 of the bobbin 1. It is formed in a U shape.

  As shown in FIG. 6, guide walls 10 are integrally formed on the inner surface of the side plate 8 of the base member 7 so as to project from both sides of the primary coil 6 and guide from both sides of the primary coil 6. Thereby, the two primary coils 6 are positioned between the guide walls 10 in a state of being separated from each other.

  Further, a first hole portion 11 through which each terminal portion 6 a of the primary coil 6 is inserted is formed at a connection portion between the bottom plate 9 and the side plate 8. Further, a bottom plate 12 continuous with the bottom plate 9 is integrally formed on the outer surface side of the side plate 8. The bottom plate 12 is formed so as to protrude in the extending direction of the side plate 8, and the second hole portion 13 into which the dummy terminal 4 a located at the end portion in the alignment direction described above is inserted in the protruding portion. It has been drilled.

  Thereby, the terminal block 3 and the four terminals 4b protruding from the terminal block 3 are arranged between a pair of opposed bottom plates 12. Further, as shown in FIG. 7, a step portion 6 b that is cut away in a direction away from the terminal block 3 is formed at the tip of the primary coil 6 adjacent to the terminal block 3 disposed between the bottom plates 12. ing.

  Further, claw portions 14 that engage the step portions 3 a formed at both ends of the terminal block 3 and connect the base member 7 and the bobbin 1 are formed at the corners on the upper surface of the bottom plate 12. A pair of E-type cores 15 are arranged on the outer periphery of the base member 7 connected to the bobbin 1 in this way. These E-type cores 15 are integrated by a tape 16 in which the outer legs 15a are arranged on the outer surface side of the side plate 8 of the base member 7 and the middle legs 15b are inserted into the bobbin 1 and wound around the outer periphery. ing.

  In the transformer configured as described above, the first hole 11 and the second hole are formed in the bottom plate of the base member 7 in which the side plate 8 is interposed between the primary coil 6 and the outer leg 15a of the E-type core 15. The dummy terminal is formed at the end of the bobbin 1 in the alignment direction of the terminal block 3 while forming the portion 13 and inserting the terminal portion 6a of the primary coil 6 into the first hole portion 11. Since 4a is inserted, relative positioning of the terminal portion 6a of the primary coil 6 and the terminal 4b of the secondary coil 5 can be easily performed with high accuracy. As a result, the assembly work can be shortened and simplified.

  Further, since the guide walls 10 projecting on both sides of each of the two primary coils 6 are formed on the inner surface of the side plate 8 of the base member 7, the primary coils 6 are electrically connected to each other by the guide walls 10. It is possible to reliably prevent the occurrence of mechanical contact or movement in the axial direction.

  Further, since the dummy terminal 4a in which the end of the secondary coil 5 is not entangled is inserted into the second hole 13 formed in the bottom plate 12 of the base member 7, as shown in FIG. The bottom plate 12 can be assembled in close contact with the terminal block 3, so that the height can be further reduced when mounted.

  In addition, at the time of assembly, the claw portions 14 formed at the corners of the bottom plate 12 of the base member 7 are engaged with the step portions 3a formed at both ends of the terminal block 3 of the bobbin 1 to connect them. For this reason, it is possible to prevent the positional deviation of the terminal 4b and the terminal portion 6a of the primary coil 6 from occurring at the time of transport and handling from the time when the transformer is manufactured to the time of mounting. Management becomes easy.

  Further, as shown in FIG. 7, a step portion 6 b that is notched in a direction away from the terminal block 3 is formed at the tip of the primary coil 6 adjacent to the terminal block 3 disposed between the bottom plates 12. Therefore, as indicated by an arrow in the figure, the insulation distance L between the primary coil 6 and the terminal 4b (or the lead wire) of the secondary coil 5 can be easily secured.

1 Bobbin 2 Flange 3 Terminal block 4a Dummy terminal 4b Terminal 5 Secondary coil 5a Insulating tape (insulating layer)
6 Primary coil 6a Terminal (end)
7 Base member 8 Side plate 9, 12 Bottom plate 10 Guide wall 11 First hole 13 Second hole 14 Claw 15 E-type core

Claims (4)

A bobbin in which a flange is integrally formed at both ends of the winding portion and a terminal block in which a plurality of terminals are planted at intervals in the direction along the end surface on the outer periphery of the flange, A secondary coil wound around the winding portion of the bobbin and having both ends entangled with the terminal, and the outer periphery of the secondary coil is covered with an insulating layer and both ends are in the same direction as the terminal A primary coil made of a U-shaped metal plate drawn out to the base, a base member made of an insulating resin covering the outer periphery of the primary coil, and a core surrounding the outer periphery of the base member and forming a closed magnetic circuit Prepared
The base member includes a pair of side plates interposed between the primary coil and the core, and is integrally formed between the side plates to cover the outer periphery of the secondary coil and each end of the primary coil. A transformer comprising: a first hole portion through which a portion is inserted; and a bottom plate formed with a second hole portion through which the terminal located at an end portion in the alignment direction is inserted.   2. The transformer according to claim 1, wherein a guide wall is formed on an inner side surface of the side plate of the base member so as to protrude from both sides of the primary coil and guide the primary coil.   The transformer according to claim 1, wherein the terminal inserted through the second hole is a dummy terminal.   The corner portion of the bottom plate of the base member is formed with a claw portion that engages with both end portions of the terminal block of the bobbin to connect the base member and the bobbin. Item 4. The transformer according to any one of Items 1 to 3.

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