JP2014082266A - Coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent short-circuit between neighboring turn parts of a winding.SOLUTION: A coil 10 includes: a winding 11 which is spirally wound to form a plurality of annual turn parts 12A; a bobbin 21 having a cylindrical part 22 inserted into the inner side of the winding 11; and a core member 15 having a pillar part 18 inserted through the cylindrical part 22. The bobbin 21 includes: an insulating partition wall 24 which protrudes from the outer periphery of the cylindrical part 22 and arranged between neighboring turn parts 12A. The partition wall 24 includes: a first wall part 25 which continues in the direction inclined to the side along the winding 11 with respect to the surface intersecting with a shaft line of the cylindrical part 22; and a second wall part 26 which continues in the direction different from that of the first wall part 25.

Description

  The present invention relates to a coil.

Conventionally, a coil is known in which a spiral winding wound around a bobbin is inserted into a core member.
The coil of Patent Document 1 has a helical protrusion formed on the outer peripheral surface of the cylindrical portion of the bobbin, and rotates a winding made of a strip-shaped rectangular copper wire to provide a clearance between adjacent turn portions of the winding. In addition, the winding is attached to the bobbin by inserting a protrusion.

Japanese Patent No. 4189745

  By the way, in the structure of patent document 1, there exists a concern that a winding may bend in the axial direction of a helix by vibration etc., and adjacent turn parts may contact, and insulation coating may be broken and adjacent turn parts may be short-circuited. .

  The present invention has been completed based on the above situation, and an object thereof is to prevent a short circuit between adjacent turn portions of a winding.

  The coil according to the present invention is wound through a spirally wound winding formed with a plurality of annular turn portions, a bobbin having a tubular portion inserted inside the winding, and the tubular portion. A core member having a pillar portion, wherein the bobbin includes an insulating partition wall protruding from an outer periphery of the cylindrical portion and disposed between the adjacent turn portions, and the partition wall includes the cylindrical portion. A first wall portion connected in a direction inclined to the side along the winding with respect to a plane orthogonal to the axis of the first wall portion, and a second wall portion continuous in a direction different from the first wall portion.

  According to this configuration, since the insulating partition is arranged between the adjacent turn portions, it is possible to prevent the adjacent turn portions from being brought into contact with each other even when vibration or the like occurs in the coil. . Therefore, it is possible to prevent a short circuit between adjacent turn portions of the winding.

  In addition, the first wall portion is continuous in a direction inclined to the side along the winding with respect to the plane orthogonal to the axis of the cylindrical portion, and the second wall portion is continuous in a direction different from the first wall portion. The coil-shaped winding is in contact with the second wall portion and is easily elastically deformed. Thus, if the winding is in elastic deformation and is in contact with the partition, vibration of the winding can be prevented as compared with the case where the winding is not in contact with the partition. Therefore, it is possible to prevent a short circuit between adjacent turn portions due to vibration or the like.

It is preferable to have the following configuration as an embodiment of the above configuration.
-The 2nd wall part is continued on the surface orthogonal to the axis of the cylindrical part.
If it does in this way, it will become easy to make a coil | winding contact | abut to a 2nd wall part, and it will become easy to carry out elastic deformation, and it will become possible to prevent the short circuit between adjacent turn parts by vibration etc. further.

-The said 2nd wall part is provided with two or more by the said partition for one round corresponding to the said one turn part.
In this way, it is possible to more reliably prevent the winding from vibrating.

The plurality of second wall portions are arranged at positions on the opposite side of 180 degrees in the partition wall for one round.
In this way, in addition to reliably preventing vibration of the winding, it is possible to form with a slide core.

-The said partition is extended to the edge part of the said cylindrical part.
In this way, the insulation between the winding and the core member can be maintained.

The bobbin includes a flange portion that projects outward from an end portion of the cylindrical portion, and the rotation restriction portion that restricts the rotation of the winding is provided on the flange portion.
In this way, the winding can be prevented from rotating with a simple configuration, so that the winding can be positioned.

The winding is a rectangular edgewise winding with a flat cross section.

  According to the present invention, it is possible to prevent a short circuit between adjacent turn portions of a winding.

The perspective view which shows the coil of Embodiment 1. FIG. Plan view showing coil AA sectional view of FIG. BB sectional view of FIG. Coiled exploded perspective view The perspective view which shows the state by which the coil | winding was attached to the bobbin. A plan view showing a state in which the winding is attached to the bobbin. Front view showing the windings attached to the bobbin Left side view showing the winding attached to the bobbin Bottom view showing the winding attached to the bobbin CC sectional view of FIG. DD sectional view of FIG. EE sectional view of FIG. Top view showing bobbin Front view showing bobbin Side view showing bobbin Bottom view showing bobbin FF sectional view of FIG. GG sectional view of FIG.

<Embodiment 1>
Hereinafter, the coil 10 of Embodiment 1 is demonstrated with reference to FIGS.
The coil 10 (FIG. 1) of this embodiment is provided in a DC / DC converter of a vehicle such as an electric vehicle or a hybrid vehicle, and can be used as a choke coil that smoothes the output voltage. In the following description, the vertical direction and the horizontal direction will be described with reference to the direction of FIG.

  As shown in FIG. 5, the coil 10 includes a winding 11 wound spirally, a bobbin 21 having a cylindrical portion 22 inserted inside the winding 11, and a pillar inserted through the cylindrical portion 22. And a core member 15 having a portion 18.

  The winding 11 is a so-called edgewise winding and is formed by spirally winding a metal wire (flat wire) having a flat rectangular cross section in the vertical direction (the short side direction of the rectangular cross section). The conductor of copper or copper alloy is covered with an insulating coating.

The winding 11 has a spiral portion 12 wound spirally and a linear connection portion 13 connected to the outside.
The spiral portion 12 includes a plurality (four in this embodiment) of annular turn portions 12A.
The plurality of turn parts 12A overlap vertically, and each turn part 12A extends in a spiral shape by the turn parts 12A adjacent to each other in the circumferential direction.
Thus, since the spiral portion 12 extends spirally in the vertical direction (axial direction of the spiral), the winding 11 is elastically deformable in the vertical direction as a whole.

  The connecting portion 13 extends from the upper end portion and the lower end portion of the spiral portion 12 along the tangential direction of the inner periphery and the outer periphery of the spiral portion 12, and a shaft portion of a bolt (not shown) is inserted through the tip portion. A circular connection hole 14 is formed through.

The core member 15 is formed of a high permeability magnetic material such as ferrite, and is configured by fitting a pair of upper and lower divided members 16 and 17 together.
Each of the divided members 16 and 17 includes a columnar column portion 18, side wall portions 19 and 19 having inner surfaces curved in an arc shape, a column portion 18 and the side wall portions 19 and 19, and a winding 11 and a bobbin 21. And a plate-like connection support portion 20 that supports the two, and these are integrally formed.

  The bobbin 21 is made of an insulating synthetic resin, and has a cylindrical cylindrical portion 22, a partition wall 24 that spirally protrudes from the outer periphery of the cylindrical portion 22, and a cylindrical shape at the lower end of the cylindrical portion 22. And a flange portion 28 protruding outwardly perpendicular to the axis of the portion 22.

The cylindrical portion 22 has an inner diameter that allows the column portion 18 of the core member 15 to be inserted.
The cylindrical portion 22 is formed with a plurality of rectangular holes 23 penetrating the cylindrical portion 22 at predetermined intervals (predetermined angles) in the circumferential direction.
The plurality of holes 23 are all formed from a predetermined height of the cylindrical portion 22 to the lower end of the cylindrical portion 22.

  As shown in FIG. 11, the partition walls 24 are integrally formed on the outer periphery of the cylindrical portion 22 so as to protrude spirally, and each partition wall 24 is disposed between the adjacent turn portions 12 </ b> A. It is constant over the entire length of 24 and is approximately half the width of the winding 11. Note that a portion of the partition wall 24 that passes outside the hole 23 of the tubular portion 22 is not connected to the tubular portion 22.

The distance between adjacent partition walls 24 is constant over the entire length of the partition wall 24 and is larger than the thickness of the winding 11.
As shown in FIG. 15, the partition wall 24 has a first wall portion 25 that is continuous in a direction inclined to the side along the winding 11 with respect to a surface orthogonal to the axis of the cylindrical portion 22, and the first wall portion 25. And a second wall portion 26 connected in a direction orthogonal to the axial direction of the cylindrical portion 22 (a direction different from the first wall portion 25).

  The first wall portion 25 is disposed along the winding 11 at portions on the left and right sides of the partition wall 24, and the inclination angle with respect to the plane perpendicular to the axis of the cylindrical portion 22 is the inclination of the winding 11. The angle has a slope that is slightly steeper than the angle (see FIG. 9).

  As shown in FIG. 15, the second wall portion 26 has a horizontal (flat) plate shape, and is provided on the front side and the rear side of the partition wall 24 so as to be continuous between the pair of first wall portions 25. As shown in FIG. 14, the first wall portion 25 is bent at a predetermined angle (an angle at which the plate surface of the second wall portion 26 is in the horizontal direction) at the position of the boundary portion 27 extending linearly. A pair of front and rear second wall portions 26 are provided on the partition wall 24 corresponding to the turn portion 12A.

One end 24 </ b> A (upper end) of the partition wall 24 that is spirally formed is formed at the upper end portion of the cylindrical portion 22, and is an intermediate portion in the left-right direction of the second wall portion 26.
The other end 24 </ b> B (lower end) of the partition wall 24 that is spirally formed is formed at a position where the lowermost turn part 12 </ b> A is sandwiched between the flange part 28, and is connected to a stopper part 30 described later.
The shape of the one end 24A of the partition wall 24 is the same as that of the other partition wall 24, and the entire length of the partition wall 24 is like a complete threaded portion with a thread having a constant protruding dimension.

  The flange portion 28 has a circular shape and projects outward from the lower end portion of the cylindrical portion 22, and the projecting dimension thereof is a size projecting outward from the outer periphery of the winding 11 and the partition wall 24. Yes.

A rotation restricting portion 29 that restricts the rotation of the winding 11 is provided on the surface of the flange portion 28 on the winding 11 side.
The rotation restricting portion 29 is in contact with the inner surface side of the winding 11 to restrict the rotation of the winding 11 more than a predetermined amount, and is locked to the outer surface side of the winding 11 to release the winding 11. And a lock part 31 that regulates

As shown in FIG. 13, the stopper portion 30 projects linearly in the tangential direction of the outer periphery of the tubular portion 22 at the lower end portion of the tubular portion 22.
The lock portion 31 is provided on the upper surface of the extending portion 28A that extends in the tangential direction from the outer periphery of the flange portion 28.

On the upper surface of the lock portion 31, when the winding 11 is turned in the mounting direction, the taper portion 31 </ b> A that slides on the winding 11 and rides on the winding 11 is restricted, and the turning of the winding 11 in the separation direction is restricted. An inclined step portion 31B is formed.
When the winding 11 is attached, when the winding 11 is in sliding contact with the tapered portion 31A, the extending portion 28A is bent, and when the outer periphery of the winding 11 reaches the stepped portion 31B, the extending portion 28A is restored and the winding 11 is wound. 11 (the connecting portion 13) is held between the stopper portion 30 and the lock portion 31, and the accommodated assembly 32 in a state where the winding 11 is assembled to the bobbin 21 is formed.

  In forming the bobbin 21, an intermediate position in the left-right direction of the second wall portion 26 (position XX in FIG. 14) is arranged between a pair of left and right slide cores (a plurality of partition walls) in an injection molding die. If it is set as the boundary position of a pair of slide core which has a some plate-shaped part), the bobbin 21 can be injection-molded.

Next, assembly of the coil 10 will be described.
The winding 11 is rotated so that the end of the winding 11 enters between the partition walls 24 at the upper end of the cylindrical portion 22 of the bobbin 21. As the winding 11 rotates, the winding 11 is inserted into the gap between the partition walls 24.

When the winding 11 is fitted to the lower end side of the cylindrical portion 22, the connecting portion 13 is disposed between the stopper portion 30 and the lock portion 31, and further rotation is restricted. At this time, the accommodation assembly 32 is obtained in which the winding 11 is assembled to the bobbin 21 in a state where the rotation to the opposite side is also restricted by the step portion 31B of the lock portion 31 (FIG. 6).
In this state, the winding 11 is in contact with and held between the plurality of second wall portions 26, and the winding 11 is slightly elastically deformed (see FIG. 4).

  Then, when the accommodated assembly 32 is mounted on the column portion 18 of the lower divided member 17 constituting the core member 15 and the upper divided member 16 is fitted and accommodated in the core member 15, the coil 10 is formed. (FIG. 1).

According to the present embodiment, the following operations and effects are achieved.
According to the present embodiment, since the insulating partition 24 is arranged between the adjacent turn portions 12A, the adjacent turn portions 12A are not brought into contact by the partition 24 even when vibration or the like occurs in the coil 10. Can be. Therefore, it is possible to prevent a short circuit between adjacent turn portions 12A.

  In addition, the first wall portion 25 is continuous in a direction inclined toward the side along the winding with respect to the plane orthogonal to the axis of the cylindrical portion 22, and the second wall portion 26 is different from the first wall portion 25. Therefore, the spiral winding 11 is in contact with the second wall portion 26 and is easily elastically deformed. In this way, if the winding 11 is elastically deformed and is in contact with the partition wall 24, it is possible to prevent vibration of the winding 11 compared to the case where the winding 11 is not in contact with the partition wall 24. Therefore, it is possible to prevent a short circuit between adjacent turn portions 12A due to vibration or the like.

  Furthermore, since the second wall portion 26 is continuous on the surface orthogonal to the axis of the cylindrical portion 22, the winding 11 is brought into contact with the second wall portion 26 and is easily elastically deformed, and vibration is further increased. It is possible to prevent a short circuit between adjacent turn parts 12A due to the above.

  In addition, since a plurality of the second wall portions 26 are provided on the partition wall 24 corresponding to one turn portion 12A, it is possible to reliably prevent the winding 11 from vibrating.

  Furthermore, since the plurality of second wall portions 26 are arranged at positions opposite to 180 degrees in the partition wall 24 for one turn, in addition to reliably preventing vibration of the winding 11, Molding with a slide core is possible.

  Moreover, since the partition wall 24 continues to the end of the cylindrical portion 22, the winding 11 and the core member 15 can be insulated.

Further, the bobbin 21 includes a flange portion 28 that protrudes outward from the end portion of the cylindrical portion 22, and the flange portion 28 is provided with a rotation restricting portion 29 that restricts the rotation of the winding 11. .
In this way, since the rotation of the winding 11 can be prevented with a simple configuration, the winding 11 can be positioned.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the said embodiment, although the coil 10 was used for the DC / DC converter of a vehicle, it is not restricted to this, You may apply this invention to the coil used other than a DC / DC converter.

(2) In the said embodiment, although the 2nd wall part 26 was set as the structure continued on the surface orthogonal to the axis line of the cylindrical part 22, it is not restricted to this, The 2nd wall part 26 is a cylindrical part. It may be continued in a direction different from the first wall portion 25 other than on the plane orthogonal to the axial direction of the 22.

DESCRIPTION OF SYMBOLS 10 ... Coil 11 ... Winding 12 ... Spiral part 12A ... Turn part 15 ... Core member 18 ... Column part 21 ... Bobbin 22 ... Cylindrical part 24 ... Partition 25 ... 1st wall part 26 ... 2nd wall part 27 ... Boundary part 28 ... ridge part 29 ... rotation restricting part 30 ... stopper part 31 ... lock part 31A ... taper part 31B ... stepped part 32 ... accommodation assembly

Claims (7)

A winding formed by spirally forming a plurality of annular turn portions;
A bobbin having a cylindrical portion inserted inside the winding;
A core member having a pillar portion inserted through the tubular portion,
The bobbin includes an insulating partition wall that protrudes from the outer periphery of the cylindrical portion and is disposed between the adjacent turn portions.
The partition wall includes a first wall portion continuous in a direction inclined to the side along the winding with respect to a plane orthogonal to the axis of the cylindrical portion, and a second wall portion continuous in a direction different from the first wall portion. A coil comprising: The coil according to claim 1, wherein the second wall portion is continuous in a direction orthogonal to the axis of the cylindrical portion. The said 2nd wall part is a coil of Claim 1 or Claim 2 provided with two or more by the said partition for one round corresponding to the said one turn part. 4. The coil according to claim 3, wherein the plurality of second wall portions are arranged at positions on the opposite side of 180 degrees in the partition wall for one round. The coil according to any one of claims 1 to 4, wherein the partition wall continues to an end portion of the cylindrical portion. The bobbin includes a flange portion projecting outward from an end portion of the cylindrical portion,
The coil according to any one of claims 1 to 5, wherein the flange portion is provided with a rotation restricting portion that restricts the rotation of the winding. The coil according to any one of claims 1 to 6, wherein the winding is a rectangular edgewise winding having a flat cross section.

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