JP6623351B2 - Trance - Google Patents

Description

  The present invention relates to a transformer used as a power transformer for a vehicle, a current transformer, or the like.

  FIG. 8 shows a conventional transformer of this type, 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 provided, and a U-shaped insulating cap 23 is provided on the outer periphery of the primary coil 22 so as to cover the primary coil 22. A pair of E-shaped cores 24 attach the outer legs 24a of each other to the insulating cap 23. And a tape (not shown) wound around the outer periphery of the bobbin 21 with the middle foot 24b inserted into the bobbin 21.

  In the transformer, a terminal block 26 having terminals 25 planted on the outer peripheral portions of the flanges at both ends of the bobbin 21 is integrally formed, and the terminal 25 is entangled with the end of the secondary coil 20. The terminal portions 22a at both ends of the primary coil 22 are drawn out in the same direction as the terminals 25. 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 configuration, it is important to position the terminal portion 22a of the primary coil 22, which is a free end, at the time of 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 much labor and skill. there were.

In addition, since it is necessary to maintain the positional accuracy of the terminal portion 22a after manufacturing and before mounting on the circuit board, it is necessary to control the accuracy of the terminal portion 22a even during storage and transport. 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 that can easily position a terminal, thereby shortening and simplifying an assembly operation. It is assumed that.

  In order to solve the above-mentioned problem, according to a transformer according to the present invention, a flange is integrally formed at both ends of a winding portion, and a plurality of terminals are formed on an outer peripheral portion of the flange in a direction along an end surface. A bobbin integrally formed with a terminal block implanted at intervals, a secondary coil wound around the winding portion of the bobbin, and both ends of which are entangled with the terminal; A primary coil made of a U-shaped metal plate which is provided 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 which covers the outer periphery of the primary coil Member, and a core surrounding the outer periphery of the base member to form a closed magnetic circuit, and the base member has a pair of side plates interposed between the primary coil and the core, The secondary coil is integrally formed between these side plates. A first hole that covers the outer periphery and through which each end of the primary coil is inserted, and a bottom plate formed with a second hole through which the terminal located at the end in the alignment direction is inserted; It is characterized by becoming.

  According to a second aspect of the present invention, in the first aspect of the present invention, a guide wall protruding on both sides of the primary coil and guiding the primary coil is provided on an inner surface of the side plate of the base member. Are formed.

  Further, the invention according to claim 3 is the invention according to claim 1 or 2, wherein the terminal inserted into the second hole is a dummy terminal. According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the corners of the bottom plate of the base member are engaged with both ends of the terminal block of the bobbin, and A claw for connecting the member and the bobbin is formed.

  According to the invention described in any one of claims 1 to 4, a first hole and a second hole are formed in a bottom plate of a base member interposed between the primary coil and the core. Since each end of the primary coil is inserted into the first hole and the terminal located at the end of the bobbin in the alignment direction of the terminal block is inserted into the second hole, the terminal becomes a terminal. 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 assembling 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. Since the guide wall protruding from both sides of the primary coil is formed on the inner 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 adjacent primary coils from electrically contacting each other by the guide wall.

  According to the third aspect of the present invention, since the terminal to be inserted into the second hole of the bottom plate of the base member is a dummy terminal to which the end of the secondary coil is not entangled, The bottom plate can be assembled by directly abutting the terminal block, thereby further reducing the height when mounting.

  Furthermore, according to the fourth aspect of the present invention, since the claw portions formed at the corners of the bottom plate of the base member are engaged with both ends of the terminal block of the bobbin to connect the two, this is achieved. At the time of transportation or handling during the period from the manufacture of the transformer to the mounting thereof, it is possible to prevent the terminal and the end of the primary coil from being displaced beforehand, thereby facilitating accuracy control.

It is an exploded perspective view showing one embodiment of a transformer of the present invention. FIG. 2 is a front view of the transformer of FIG. 1 after assembly. FIG. 3 is a sectional view taken along line AA of FIG. 2. FIG. 3 is a bottom view of FIG. 2. FIG. 4 is an enlarged view of a portion B in FIG. 3. It is a perspective view which shows the base member of FIG. FIG. 4 is an enlarged perspective view showing a portion near a terminal block of FIG. 3. FIG. 11 is an exploded perspective view showing a conventional transformer.

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

  On the other hand, a plurality of (six in the figure) terminals 4a and 4b are planted in a straight line on the lower surface of each terminal block 3, and the terminals planted at both ends in the above-mentioned arrangement direction. 4a is a dummy terminal. Then, a secondary coil 5 is wound around the outer periphery of the winding portion, and its ends are entangled with the terminals 4b of the terminal block 3, respectively. Here, an insulating tape 5a is wound around the outer periphery of the secondary coil 5, and two primary coils 6 are arranged on the outer periphery.

  Each of these primary coils 6 is formed by bending a strip-shaped copper plate in an out-of-plane direction to form a U-shape, and is disposed on the outer periphery of the secondary coil 5 (insulating tape 5a) with a gap in the axial direction. Have been. Each primary coil 6 is disposed so as to cover the outer circumference of the secondary coil 5 (insulating tape 5a), that is, the outer circumference of a pair of long sides and a short side adjacent thereto. The terminal portions 6a at both ends are drawn out in the same direction as the terminals 4a and 4b between the terminal blocks 3.

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

  As shown in FIG. 6, a guide wall 10 projecting from both sides of the primary coil 6 and guided from both sides of the primary coil 6 is integrally formed on the inner surface of the side plate 8 of the base member 7. As a result, the two primary coils 6 are positioned between the guide walls 10 while being separated from each other.

  Further, a first hole 11 through which each terminal 6a of the primary coil 6 is inserted is formed in a connection portion of the bottom plate 9 with the side plate 8. Further, a bottom plate 12 that is 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 direction in which the side plate 8 extends, and the second hole 13 into which the dummy terminal 4a located at the end in the alignment direction described above is inserted. Has been drilled.

  Thus, the terminal block 3 and the four terminals 4b protruding from the terminal block 3 are arranged between the pair of opposed bottom plates 12. As shown in FIG. 7, a stepped portion 6 b cut out in a direction away from the terminal block 3 is formed at a tip end portion of the primary coil 6 adjacent to the terminal block 3 arranged between the bottom plates 12. ing.

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

  In the transformer having the above configuration, the first hole 11 and the second hole 11 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-shaped core 15. A terminal 13 is formed, the terminal 6a of the primary coil 6 is inserted into the first hole 11, and the dummy terminal located at the end of the terminal block 3 of the bobbin 1 in the alignment direction is inserted into the second hole 13. Since the terminal 4a is inserted, the relative positioning between the terminal 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 assembling work can be shortened and simplified.

  Further, since the guide walls 10 projecting from both sides of each of the two primary coils 6 are formed on the inner side 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 the contact or the movement in the axial direction.

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

  In addition, at the time of assembling, 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 a positional shift from occurring in the terminal 4b and the terminal portion 6a of the primary coil 6 at the time of transportation or handling between the time of manufacturing the transformer and the time of mounting the transformer. Management becomes easier.

  As shown in FIG. 7, a stepped portion 6 b cut out in a direction away from the terminal block 3 is formed at a distal end portion of the primary coil 6 adjacent to the terminal block 3 disposed between the bottom plates 12. Therefore, 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 as shown by the arrow in the figure.

Reference Signs List 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)
Reference Signs List 7 base member 8 side plate 9, 12 bottom plate 10 guide wall 11 first hole 13 second hole 14 claw 15 E-shaped core

Claims (4)

A bobbin integrally formed with a terminal block in which a flange is integrally formed at both ends of the winding portion and a plurality of terminals are implanted at intervals on an outer peripheral portion of the flange in a direction along an end surface. A secondary coil wound around the bobbin and having both ends entangled with the terminal, and an outer periphery of the secondary coil with an insulating layer interposed therebetween so that both ends are in the same direction as the terminal. A primary coil made of a U-shaped metal plate drawn out of the above, 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 to form a closed magnetic path. Be 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 an outer periphery of the secondary coil and to be connected to each end of the primary coil. A transformer comprising: a first hole through which a portion is inserted; and a bottom plate formed with a second hole through which the terminal located at an end in the alignment direction is inserted.   The transformer according to claim 1, wherein a guide wall protruding from both sides of the primary coil and guiding the primary coil is formed on an inner surface of the side plate of the base member.   3. The transformer according to claim 1, wherein the terminal inserted into the second hole is a dummy terminal.   A claw portion is formed at a corner of the bottom plate of the base member to engage with both ends 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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