JP4557254B2 - Winding parts with cover - Google Patents

Description

  The present invention relates to a winding component with a cover used as a transformer, a coil, and the like. More specifically, a coil in which a plurality of L-shaped pin terminals are mounted on a terminal mounting portion of a bobbin and winding is applied to a winding core portion. And a cover covering the pin terminal on the terminal mounting portion, and a winding component including a magnetic core.

  For example, in plasma display devices and liquid crystal display devices, pin terminal type power transformers and choke coils are used. However, there is an increasing demand for smaller and thinner winding parts. Therefore, a structure with a cover is employed to improve the electrical insulation between the magnetic core and the pin terminal.

  Conventional winding parts with a cover of this type include a coil in which a plurality of pin terminals are mounted on the terminal mounting portion of the bobbin and a winding is applied to the winding core portion, and a cover that covers at least the terminal mounting portion of the bobbin. And a structure having a magnetic core partially inserted into the winding core. Here, each pin terminal has a shape bent into an L shape, and is mounted so that the horizontal portion thereof is positioned on the terminal mounting portion and the vertical portion penetrates the terminal mounting portion. The cover is made of a resin having electrical insulation, and is provided to ensure insulation between the bent portion of the pin terminal and the magnetic core (see Patent Document 1, etc.). For example, in order to secure the distance between the bent portion of the pin terminal and the magnetic core, a structure is adopted in which a groove is provided on the inner side of the bobbin and an insulating wall that fits into the groove is provided on the cover side. However, such a structure is very complicated, and can only be attached to the bobbin if it is not slid laterally, so that it can only be attached to one side, thus limiting its application. If it is to be installed on both sides, the cover must be divided.

  Therefore, a cover with a simplified structure was proposed. This is a structure in which a horizontal top plate portion serving as a partition wall is in contact with a magnetic core, and an end surface of the top plate portion abuts on a bobbin. In this case, the insulation distance is the linear distance between the abutting position of the top plate portion and the bobbin and the pin terminal. Therefore, in order to increase the insulation distance, it is necessary to increase the height between the pin terminal and the magnetic core to some extent, or to increase the horizontal distance between the contact position between the top plate and the bobbin and the pin terminal to some extent. There is. For this reason, it is difficult to reduce the height or reduce the mounting area as a winding component with a cover.

In addition, the winding work is automatically performed by attaching the bobbin to the winding machine, and at that time, a considerable force is applied to the bobbin. Therefore, the thickness of each part is increased to some extent as a whole to increase the mechanical strength, making it difficult to reduce the size and thickness of the bobbin.
JP-A-11-297535

  The problem to be solved by the present invention is to make it possible to reduce the height or reduce the mounting area of the winding component with cover while maintaining high electrical insulation.

  The present invention mounts a plurality of L-shaped pin terminals on the terminal mounting portion of the bobbin such that the horizontal portion is positioned on the terminal mounting portion and the vertical portion penetrates the terminal mounting portion, and the bobbin winding Bobbin terminal mounting in a coiled part with a coil that has a winding around the core, a cover that covers at least the terminal mounting part of the bobbin, and a magnetic core that is partially inserted into the winding core A protrusion is formed on the outer flange surface of the core portion at a position between the pin terminals on the portion, and an inner insulating wall is provided on the cover so as to face the outer flange surface of the core portion. A grooved part with a cover, wherein a groove that fits into the protrusion is formed.

  The cover is a molded product of a synthetic resin having electrical insulation. For example, a structure having only a main body covering the terminal mounting portion may be used, but a main body covering the terminal mounting portion and a peripheral wall portion covering the side surface of the rising coil from the main body may be integrally formed.

  Since the winding component with a cover according to the present invention has a structure in which an inner insulating wall is provided on the cover so as to face the outer flange surface of the bobbin winding core portion, the insulating distance between the magnetic core and the pin terminal is the inner insulating wall. The length along the wall can be increased, so that the height of the covered winding part can be reduced while maintaining high electrical insulation. If the height is not reduced, the mounting area can be reduced.

  Further, in the winding component with a cover according to the present invention, the protrusions are formed on the outer flange surface of the core portion at the position between the pin terminals on the terminal mounting portion of the bobbin, so that the thickness of the bobbin core portion is increased. The mechanical strength can be improved despite the reduction in thickness and size and weight, and cracking due to the force applied during winding can be prevented. In addition, since the groove that fits into the protrusion is formed on the inner insulating wall of the cover, the strength of the cover can be increased and the size of the coiled part with the cover can be reduced.

  FIG. 1 is a schematic view showing an embodiment of a winding component with a cover according to the present invention, in which A shows a state before assembly and B shows a state after assembly. The winding component with a cover includes a coil 14 having a bobbin 10 with a winding 12, a cover 16 covering the coil 14, and a pair of magnetic cores 18.

  The bobbin 10 is an integrally molded product of synthetic resin. Terminal mounting portions 22 are provided on both lower portions (lower flange portions) of the core portion 20 having flanges on both sides, and a plurality of L-shaped pin terminals are provided on the terminal mounting portions 22. 24 is mounted. Each pin terminal 24 is fixed so that its horizontal portion is located on the terminal mounting portion 22 and its vertical portion penetrates the terminal mounting portion 22. A predetermined winding 12 is applied to the core 20 of the bobbin 10 to form a coil 14. The cover 16 covers at least the terminal attachment portion 22 of the bobbin 10, and here, a main body portion 26 covering the terminal attachment portion 22 and a peripheral wall portion 28 covering the side surface of the rising coil from the main body portion 26, It has a structure that is integrally molded with an electrically insulating resin. A combined structure of the coil 14 and the cover 16 is shown in FIG.

  Both magnetic cores 18 are deformed E-type cores having the same shape, and their central leg portions 18a are inserted into the holes 30 of the bobbin winding core portion from both sides, and the both side leg portions 18b surround the outer periphery of the coil 14 and collide with each other. Arranged to match.

  In this embodiment, as shown in FIG. 2 and FIG. 3A, the bobbin 10 has a protrusion extending vertically in the position between the pin terminals on the terminal mounting portion 22 and on the outer flange surface of the core portion 20. Article 32 is formed. FIG. 3A shows the upper surface of the bobbin 10. Even if the flange is thinned by this protrusion 32, the mechanical coupling strength between the core part 20 and the terminal attachment part 22 can be increased. When automatic winding is performed by holding the terminal mounting portion 22 with a winding machine, considerable stress acts on the bobbin 10, but the mechanical strength increases, so that the bobbin 10 is damaged during the winding operation. There is no fear of doing. That is, the bobbin 10 can be reduced in size and weight.

  In this embodiment, as shown in FIG. 2 and FIG. 3B, the cover 16 is provided with an inner insulating wall 34 so as to face the outer flange surface of the core 20, and the inner insulating wall 34 has the above-described inner insulating wall 34. A groove 36 that fits into the protrusion 32 of the bobbin 10 is formed. FIG. 3B shows the bottom surface of the cover 16. By fitting the groove 36 of the inner insulating wall 34 of the cover 16 and the protrusion 32 on the outer flange surface of the bobbin 10, rattling when both are combined can be suppressed.

  FIG. 4 shows a longitudinal section of the coiled part with cover after assembly. The problem from the viewpoint of electrical insulation is the shortest distance (creeping distance) between the magnetic core 16 and the pin terminal 24, and the necessary minimum length must be ensured. In the present invention, as shown in an enlarged manner, since the inner insulating wall 34 is provided on the cover 16, the shortest distance between the position of the magnetic core 18 and the bent position of the pin terminal 24 is indicated by a thick arrow. As shown, the sum (a + b) of the distance a in the vertical direction along the inner insulating wall 34 from the position of the magnetic core 18 and the distance b in the horizontal direction from the lower end of the inner insulating wall 34 to the bent position of the pin terminal 24. It becomes. This distance is therefore always longer than in the prior art without an inner insulating wall. In other words, since the creepage distance can be increased by the height of the inner insulating wall, the winding part can be made thinner or smaller.

  4A shows an example in which the height of the inner insulating wall 34 of the cover 16 is suppressed (a is made smaller and b is made larger) to reduce the thickness of the winding component, and FIG. This is an example in which the inner insulating wall 34 of 16 is increased (a is increased and b is decreased) to reduce the mounting area of the winding component. Therefore, H1 <H2 and W1> W2. In any case, the dimensions of a and b are determined so that the total creepage distance (a + b) is not less than the necessary minimum.

  FIG. 5 is a schematic view showing another embodiment of the winding component with a cover according to the present invention. A shows the state before assembly, and B shows the state after assembly. This is different in cover shape from the above embodiment, and the cover 46 has a structure that only covers the terminal mounting portion 22 of the bobbin 10. Basically, the other members may be the same as those in the above embodiment, so the corresponding members are denoted by the same reference numerals, and description thereof will be omitted. A protrusion 32 is formed on the outer flange surface of the core portion 20 at a position between the pin terminals on the terminal mounting portion 22 of the bobbin 10 and on the inner side of the cover 46 so as to face the outer flange surface of the core portion 20. The point which provided the insulating wall 34 and formed the groove | channel 36 which fits the said protrusion 32 in this inner side insulating wall 34 is the same as that of the said Example. Therefore, also in this example, it is possible to reduce the thickness or the size while improving the mechanical strength and ensuring high electrical insulation.

The assembly schematic which shows one Example of the winding components with a cover which concerns on this invention. The side view which shows a bobbin and a cover. The top view of a bobbin, and the bottom view of a cover. The longitudinal cross-sectional view of the winding component with a cover. The assembly schematic which shows the other Example of the winding component with a cover which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Bobbin 12 Winding 14 Coil 16 Cover 18 Magnetic core 20 Core part 22 Terminal attachment part 24 Pin terminal 26 Cover body part 28 Cover peripheral wall part 30 Bobbin core part hole 32 Projection 34 Inner insulating wall 36 Groove

Claims (2)

A plurality of L-shaped pin terminals are mounted on the terminal mounting portion of the bobbin so that the horizontal portion is positioned on the terminal mounting portion and the vertical portion penetrates the terminal mounting portion, and is wound around the core portion of the bobbin. In a winding component with a cover including a coil to which a wire is applied, a cover that covers at least the terminal mounting portion of the bobbin, and a magnetic core that is partially inserted into the core portion,
A protrusion is formed on the outer flange surface of the core portion at a position between the pin terminals on the terminal mounting portion of the bobbin, and an inner insulating wall is provided on the cover so as to face the outer flange surface of the core portion. A winding part with a cover, characterized in that a groove that fits the protrusion is formed in an inner insulating wall. The cover-covered winding according to claim 1, wherein the cover has a structure in which a main body portion covering the terminal mounting portion and a peripheral wall portion rising from the main body portion and covering a side surface of the coil are integrally formed of an electrically insulating resin. Wire parts.

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