JP2011253877A - Magnetic component unit and magnetic component fixed structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-cost magnetic component unit and a magnetic component fixed structure where assemblability to a fixed body and heat dissipation are excellent and a core cracks hardly occurs.SOLUTION: A magnetic component unit 1 comprises a magnetic component 2 including a coil 21, an upper core 22, and a lower core 23 and a spring holder 3 having a holding function that holds a magnetic component and a fixing function that fixes the magnetic component to a fixed body. The spring holder includes a leaf spring part 31 that is brought into press contact with a top surface 221 of the upper core, a holding leg part 32 that locks a lower surface of the lower core, and a fixed leg part 33 that protrudes outside. The holding function of the spring holder is implemented by the leaf spring part and the holding leg part. The fixing function of the spring holder is implemented by the leaf spring part and the fixed leg part. The holding leg part includes a side contact part 321 abutting on a side face 232 of the lower core, a clearance formation part 322 that forms a clearance on the lateral side of a lower side corner 233 of the lower core, and a bearing part 323 supporting the lower surface of the lower core.

Description

  The present invention relates to a magnetic component unit having a spring holder for holding a magnetic component and fixing the magnetic component to a fixed body, and a magnetic component fixing structure in which the magnetic component is fixed to the fixed body.

For example, as a magnetic component such as a transformer, a choke coil, or a reactor, one having a coil formed by winding a conductor and an upper core and a lower core arranged so as to sandwich the coil from both sides in the winding axis direction. is there.
In fixing such a magnetic component to a fixed body such as a housing, as shown in FIG. 17, the holding portion 931 that holds the upper core 922 and the lower core 923 of the magnetic component 92 and the magnetic component 92 are fixed bodies. It has been proposed to use a spring holder 93 having a fixing portion 934 that is fixed to the housing 94 (Patent Document 1).

That is, first, by holding the upper core 922 and the lower core 923 from the winding axis direction by the holding portion 931, the spring holder 93 is attached to the magnetic component 92 to form a magnetic component unit. Next, the magnetic part unit is fixed to the housing 94 by screwing the fixing portion 934 to the housing 94.
Thus, the spring holder 93 includes the holding portion 931 having a function of holding the upper core 922 and the lower core 923 of the magnetic component 92 and the fixing portion 934 having a function of fixing the magnetic component 92 to the housing 94. And integrated.

JP 2009-94312 A

However, the spring holder 93 has a configuration in which the holding portion 931 and the fixing portion 934 are simply integrated. That is, the holding portion 931 includes a holding leaf spring portion 932 that contacts the upper surface of the upper core 922, and a holding leg portion 933 that hangs down from both ends of the holding leaf spring portion 932 and engages the lower surface of the lower core 923. The fixing portion 934 includes a fixing leaf spring portion 935 that contacts the upper surface of the upper core 922, and a fixing leg portion 936 that hangs down from both ends of the fixing leaf spring portion 935 and protrudes outward. . The holding plate spring portion 931 and the fixing plate spring portion 934 are connected by a connecting portion 937.
Therefore, although it is a single member, the material cost of the spring holder 93 is not reduced.

In the magnetic component fixing structure, the magnetic component 92 is fixed to the housing 94 with the lower surface of the lower core 923 in pressure contact with the mounting surface 941 of the housing 94. Therefore, when the magnetic component 92 is fixed to the housing 94, it is not particularly necessary to hold the upper core 922 and the lower core 923 by the holding portion 931.
Since the fixing plate spring portion 935 and the holding plate spring portion 932 are independent from each other, even in the state of the magnetic component unit in which the spring holder 93 is mounted on the magnetic component 92 in the holding portion 931, the fixing portion 934 is It is in a free state before it is deformed. Therefore, when the magnetic component unit is fixed to the housing 94, the fixing portion 934 needs to be greatly deformed, and there is a problem that the fixing work is troublesome.
Here, when the displacement of the fixing portion 934 is reduced, the force that presses the magnetic component 92 against the housing 94 by the fixing portion 934 is reduced, and the heat dissipation of the magnetic component 92 through the housing 94 is reduced, or it is resistant to vibration. There is a risk that sufficient fixing force cannot be secured.

The spring holder 93 is mounted so that the holding legs 933 are in contact with the side surfaces of the upper core 922 and the lower core 923 in the entire vertical direction, and the lower corners 924 of the lower core 923 are also laterally connected. The holding leg 933 comes into contact. Therefore, if the holding leg 933 is tilted even a little, stress is applied from the holding leg 933 to the lower corner 924, and the lower core 923 may be cracked.
Further, a support portion 938 that is bent inward and supports the lower surface of the lower core 923 is formed at the lower end portion of the holding leg portion 933. The inner side surface of the bent portion of the support portion 938 is curved. Therefore, the lower corner portion 924 of the lower core 923 comes into contact with the curved surface portion, and the lower core 923 may be cracked.

  The present invention has been made in view of such problems, and has a low-cost magnetic component unit and a magnetic component fixing structure that are excellent in assembling to an object to be fixed, hard to cause core cracking, and excellent in heat dissipation. It is something to be offered.

A first aspect of the invention is a magnetic component having an upper core and a lower core that are arranged to face each other, and a coil that is arranged so that magnetic paths formed by the upper core and the lower core are interlinked,
A spring holder having both a holding function for holding the magnetic part and a fixing function for fixing the magnetic part to a fixed body;
The spring holder includes a leaf spring portion that is pressed against the upper surface of the upper core, at least a pair of holding leg portions that hang from both ends of the leaf spring portion and engage the lower surface of the lower core, and both ends of the leaf spring portion. And at least a pair of fixed legs that hang down from and project outward.
The holding function of the spring holder is realized by the leaf spring part and the holding leg part,
The fixing function of the spring holder is realized by the leaf spring part and the fixing leg part,
The holding leg includes a side contact portion that protrudes inward and contacts the side surface of the lower core, and a clearance that forms a clearance on the side of the lower corner portion of the lower core below the side surface contact portion. The magnetic component unit includes a forming portion and a support portion that supports the lower surface of the lower core.

A second invention is a magnetic component fixing structure formed by fixing the magnetic component unit according to the first invention to the fixed body,
The fixed body has a mounting surface on which the magnetic component is mounted, and a fastening surface for fastening and fixing the fixed leg.
The fixed leg portion is fastened and fixed to the fastening surface by a fastening member,
The lower surface of the lower core is in pressure contact with the mounting surface,
In the magnetic component fixing structure, the support portion of the holding leg portion is separated from the lower surface of the lower core.

  In the first aspect of the invention, the spring holder realizes the holding function by the leaf spring portion and the holding leg portion, and realizes the fixing function by the leaf spring portion and the fixed leg portion. That is, the holding function and the fixing function can be realized by using the common leaf spring part. Therefore, the material cost of the spring holder can be reduced.

The spring holder includes the leaf spring portion, the pair of holding leg portions and the pair of fixed leg portions respectively hanging from both ends of the leaf spring portion. Thereby, the deformation amount of the leaf | plate spring part at the time of fixing the said magnetic component unit to a to-be-fixed body can be made small.
That is, in the state of the magnetic component unit in which the spring holder is mounted on the magnetic component, that is, in the state where the leaf spring portion is pressed against the upper surface of the upper core and the holding leg portion is engaged with the lower surface of the lower core, the leaf spring portion is It has already been deformed to some extent (mainly elastic deformation) from the free state. Therefore, when the magnetic component unit is fixed to the fixed body, the leaf spring portion that has already been deformed to some extent is only further deformed in the same direction, so the amount of deformation of the leaf spring portion at this time is reduced. can do.

In other words, the plate spring portion in the free state is not deformed at a stretch, but is deformed to some extent when the magnetic component unit is configured, so that it can be deformed in stages.
Therefore, when fixing the magnetic component unit to the fixed body, it is not necessary to greatly deform the leaf spring portion, and accordingly, the fixed leg portion does not need to be greatly displaced, and the assembly to the fixed body can be easily performed. Can do.

  And even if it does not enlarge the displacement of the leaf | plate spring part at this time, a magnetic component unit can be pressed to a to-be-fixed body with big force. Therefore, the magnetic component can be pressed against the fixed body with a sufficient force, and the heat dissipation and vibration resistance of the magnetic component through the fixed body can be sufficiently ensured.

The holding leg portion is formed by protruding the side surface abutting portion inward. Therefore, it is possible to prevent the lower core from shifting in the horizontal direction of the magnetic component with respect to the spring holder (the direction perpendicular to the winding axis direction).
And the said holding | maintenance leg part has the said clearance formation part, and forms the clearance in the side of the lower side corner part of the said lower core. Thereby, it can prevent that the inner surface of the bending part of the support part in a holding | maintenance leg part interferes with a lower side corner | angular part. Therefore, it can prevent effectively that a crack occurs in the lower core from the lower corner.

The second invention is a magnetic component fixing structure in which the magnetic component unit is fixed to a fixed body. Therefore, the same effect as that of the first invention can be obtained.
And the said support part of the said holding | maintenance leg part is separated from the lower surface of the said lower core. Therefore, the urging force (restoring force) of the leaf spring portion directly becomes the pressure contact force of the magnetic component against the fixed body. Therefore, the magnetic component is fixed in a state of being firmly pressed against the fixed body, and a stable magnetic component fixing structure can be obtained.
Further, since the lower surface of the lower core is pressed against the fixed body with a sufficient force, the heat of the magnetic component can be transmitted to the fixed body and the magnetic component can be effectively cooled.

  As described above, according to the present invention, it is possible to provide a low-cost magnetic component unit and a magnetic component fixing structure that are excellent in assembling to a fixed body, hardly cause core cracking, and excellent in heat dissipation. .

It is sectional drawing of the magnetic component unit in Example 1, Comprising: It is AA arrow sectional drawing of FIG. FIG. 3 is a plan view of a magnetic component unit according to the first embodiment. The perspective view of the spring holder in Example 1. FIG. Sectional drawing of the spring holder in the free state in Example 1. FIG. Sectional explanatory drawing in Example 1 just before mounting | wearing a magnetic holder with a spring holder. FIG. 3 is a perspective view of a magnetic component in Example 1. Sectional explanatory drawing in the state which mounted the magnetic component unit in the housing | casing in Example 1. FIG. Sectional drawing of the magnetic component fixing structure in Example 1. FIG. The top view which shows the state which the engaging part for positioning of the flange part engaged with the protrusion part for positioning of the to-be-fixed body in Example 1. FIG. Cross-sectional explanatory drawing which shows the malfunction when not providing a clearance formation part in a spring holder. Sectional drawing of the magnetic component fixing structure in Example 2. FIG. FIG. 9 is a partial cross-sectional view of a magnetic component unit in Embodiment 3. The top view of the magnetic component unit in Example 4. FIG. FIG. 14 is a cross-sectional view taken along line B-B in FIG. 13. The top view of the magnetic component unit in Example 5. FIG. The CC sectional view taken on the line of FIG. Explanatory perspective explanatory drawing of the magnetic component fixing structure in the background art.

  In the present invention, the upper core and the lower core are not particularly limited in the vertical relationship, but are expressed for convenience. Even if the positional relationship is upside down, it may be horizontal or diagonal. Good. Similarly, the other expressions “upper” and “lower” do not limit the actual vertical relationship.

In the first invention or the second invention, examples of the magnetic component include a transformer, a choke coil, and a reactor.
Further, the number of the spring holders may be one or a plurality may be provided.
The upper core and the lower core may each be a plurality. In this case, it is preferable that a plurality of the above-mentioned spring holders are arranged corresponding to the number of cores.

In the spring holder, at least the leaf spring portion can be deformed, and the deformation is mainly elastic deformation, but plastic deformation may occur depending on the displacement. In other words, if the displacement of the leaf spring portion is within the elastic region, only elastic deformation occurs, but if the displacement of the leaf spring portion reaches the plastic region, plastic deformation also occurs along with the elastic deformation. However, even in this case, since the restoring force for elastic deformation is maintained, even if the spring holder is attached to the magnetic component or is fixed to the fixed body in a state of being deformed with plastic deformation. It is possible to exert its function.
Therefore, in the present specification, the term “deformation” for each part of the spring holder including the leaf spring part mainly means elastic deformation, but also means a case of plastic deformation in combination with elastic deformation. .

Further, it is preferable that the spring holder is biased in a direction in which the pair of holding leg portions approach each other.
In this case, the magnetic component can be positioned more reliably. In addition, since the support portion can be more reliably brought into contact with the lower surface of the lower core, the holding function can be reliably exhibited.

Moreover, it is preferable that the said side surface contact part is contact | abutting over both the said lower core and the said upper core.
In this case, it is possible to accurately position both the lower core and the upper core.

Further, the lower core is preferably configured such that a notch step portion is formed on at least a part of the outer periphery of the lower surface, and the support portion of the spring holder is disposed in the notch step portion. Item 4).
In this case, it can prevent that the said support part of the said spring holder interferes with the mounting surface in which the said lower core in the said to-be-fixed body is mounted. In addition, since it is not necessary to form a relief portion for preventing the interference of the support portion on the mounting surface, the structure of the fixed body can be simplified.

Further, it is preferable that a part of the holding leg part and a part of the fixed leg part share a common leg part hanging from both ends of the leaf spring part.
In this case, the elastic force of the leaf spring portion can be sufficiently ensured.

Further, it is preferable that the holding leg portion and the fixed leg portion branch from each other at the lower end of the common leg portion and further extend downward.
In this case, since the holding leg can be deformed independently from the fixed leg, the force required for the deformation is small, and the spring holder can be easily attached to the magnetic component. .

Preferably, the holding leg and the fixed leg are each formed in pairs.
In this case, the structure of the spring holder can be simplified, the mounting to the magnetic component is facilitated, and the material cost and processing cost of the spring holder can be reduced.

The rigidity of the holding leg portion is preferably equal to or less than the rigidity of the leaf spring portion.
In this case, when the spring holder is attached to the magnetic component, deformation of the leaf spring portion can be suppressed and the holding leg portion can be greatly deformed, thereby further improving the mounting property to the magnetic component. be able to. In addition, since excessive deformation of the leaf spring portion can be avoided, the restoring force of the leaf spring portion after the spring holder is mounted on the magnetic component can be sufficiently secured, and the holding force of the magnetic component by the spring holder and fixation The fixing force to the body can be secured.

Further, the fixed leg portion has a flange portion protruding outward, and a through hole for inserting a fastening member for fastening the spring holder to the fixed body is formed in the flange portion. The through hole is preferably a long hole that is long in the protruding direction of the flange portion.
In this case, even if the dimensional accuracy of the spring holder with respect to the fixed body is not particularly high, the spring holder can be easily fixed to the fixed body. That is, the spring holder has a large number of bent portions and is in a state of being deformed from the free state in the state where the upper core and the lower core are sandwiched, in particular, the dimension in the direction parallel to the protruding direction of the flange portion. Accuracy tends to be low. Therefore, when the through hole is a long hole extending in the protruding direction of the flange portion, the fastening member can be easily inserted into the through hole when the spring holder holding the magnetic component is fixed to the fixed body. .
In particular, when a magnetic component is automatically assembled to a fixed body, the displacement of the through hole with respect to the fixed body has a large effect on the production efficiency. In particular.

Next, in the second invention, an escape portion for avoiding interference of the holding leg portion with the support portion may be formed on the mounting surface of the fixed body. .
In this case, it is not particularly necessary to form the notch step in the lower core. Even in the case where the cut step portion is formed, the space for disposing the support portion can be increased by forming the relief portion. As a result, the amount of deformation of the leaf spring portion when the magnetic component unit is fixed to the fixed body can be increased, and the degree of design freedom is improved.

Preferably, the fixed leg portion has a positioning engagement portion that engages with a positioning projection provided on the fastening surface of the fixed body.
In this case, before the spring holder holding the magnetic component is fastened and fixed to the fixed body by the fastening member, first, the positioning engaging portion is engaged with the positioning protrusion, thereby the magnetic component is fixed. The held spring holder can be positioned with respect to the fixed body. Thereby, both can be fastened and fixed easily.
In addition, as described above, by engaging the positioning engaging portion with the positioning protrusion, both the magnetic component is placed on the fixed body and before the fastening is fixed. It can be prevented from shifting. For example, the fixed body on which the magnetic component is placed may be conveyed after the magnetic component is arranged on the fixed body and before being fastened and fixed. At this time, it is also conceivable that the position of the spring holder with respect to the fixed body shifts due to the positional shift between the magnetic component and the fixed body due to the vibration accompanying the conveyance. However, as described above, by engaging the positioning engaging portion with the positioning protrusion, both can be prevented from shifting and the fastening and fixing of both can be performed smoothly.

Example 1
A magnetic component unit and a magnetic component fixing structure according to an embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the magnetic component unit 1 of this example includes a magnetic component 2 and a spring holder 3.

The magnetic component 2 includes an upper core 22 and a lower core 23 that are arranged to face each other, and a coil 21 that is arranged so that magnetic paths formed by the upper core 22 and the lower core 23 are linked. That is, the upper core 22 and the lower core 23 are arranged so as to sandwich the coil 21 formed by winding the conductor from both sides in the winding axis direction.
As shown in FIGS. 1 to 4 and 11, the spring holder 3 has both a holding function for holding the magnetic component 2 and a fixing function for fixing the magnetic component 2 to a housing 4 as a fixed body.

  The spring holder 3 includes a leaf spring portion 31 that presses against the upper surface 221 of the upper core 22, at least a pair of holding leg portions 32 that hang down from both ends of the leaf spring portion 31 and engage the lower surface 231 of the lower core 23, and a plate It has at least a pair of fixed leg portions 33 that hang down from both ends of the spring portion 31 and protrude outward.

The holding function of the spring holder 3 is realized by the leaf spring portion 31 and the holding leg portion 32. The fixing function of the spring holder 3 is realized by the leaf spring portion 31 and the fixing leg portion 33.
As shown in FIG. 1, the holding leg 32 includes a side contact portion 321 that protrudes inward and contacts the side surface 232 of the lower core 23, and a lower corner portion 233 of the lower core 23 below the side contact portion 321. A clearance forming portion 322 that forms a clearance on the side of the lower core 23 and a support portion 323 that supports the lower surface 231 of the lower core 23.

In this example, the magnetic component 2 is a transformer used in an insulated DC-DC converter. Therefore, in the present example, the coil 21 includes a primary coil and a secondary coil, which are omitted in the drawing.
The upper core 22 and the lower core 23 are so-called E-shaped cores having a substantially E-shaped cross section along a winding center axis of the coil 21, and are inserted and arranged inside the coil 21. Center magnetic legs 228 and 238 and outer peripheral magnetic legs 229 and 239 disposed on the outer periphery of the coil 21 are provided. The upper core 22 and the lower core 23 are in contact with each other at the outer peripheral magnetic legs 229 and 239. The side surface 222 of the upper core 22 and the side surface 232 of the lower core 23 form the same surface.

The spring holder 3 is configured by cutting and bending a metal plate such as stainless steel, copper, or a copper alloy.
The leaf spring portion 31 is curved so that the center is directed downward, and is in contact with the upper surface 221 of the upper core 22 at the center portion.

  The spring holder 3 is biased in a direction in which the pair of holding leg portions 32 approach each other. That is, as shown in FIG. 4, in the state (free state) before being attached to the magnetic component 2, the pair of holding leg portions 32 are closer to each other than in the attached state (FIG. 1). The distance between the contact portions 321 is small.

As shown in FIG. 1, the side contact portion 321 is in contact with both the lower core 23 and the upper core 22. The side surface abutting portion 321 is formed in a flat shape in contact with the side surface 232 of the lower core 23 and the side surface 222 of the upper core 22. The side surface 232 and the side surface 222 are in contact with each other.
As shown in FIGS. 1 and 6, the lower core 23 is formed by forming a notch step 234 in a part of the outer periphery of the lower surface 231. The support portion 323 of the spring holder 3 is disposed in the notch step portion 234.

  Note that a notch step 224 similar to the notch step 234 is also formed on a part of the outer periphery of the upper surface 221 of the upper core 22, and a member is particularly arranged in the notch step 224. There is no. In this example, since the upper core 22 and the lower core 23 are formed in the same shape from the viewpoint of productivity, the notched step portion 224 is also formed in the upper core 22, but it is not always necessary for the function.

As shown in FIG. 3, a part of the holding leg part 32 and a part of the fixed leg part 33 share a common leg part 34 hanging from both ends of the leaf spring part 31. The holding leg portion 32 and the fixed leg portion 33 branch from each other from the lower end of the common leg portion 34 and extend further downward.
A pair of holding legs 32 and fixed legs 33 are formed.
The rigidity of the holding leg portion 32 is equal to or less than the rigidity of the leaf spring portion 31. In this example, the holding leg portion 32 has a smaller plate width and lower rigidity than the leaf spring portion 31.

The fixed leg 33 includes a hanging part 331 that hangs downward from the common leg part 34, and a flange part 332 that is bent outward from the lower end of the hanging part 331. The flange portion 332 is formed with a through hole 333 for inserting a screw 11 described later. The through hole 333 is a long hole that is long in the protruding direction of the flange portion 332.
The holding leg portion 32 is provided with the side surface abutting portion 321 at a position extending downward from the lower end of the hanging portion 331 from the common leg portion 34, further extending downward, and bending inward at the lower end. Thus, the support portion 323 is provided. As shown in FIG. 1, the support portion 323 is in surface contact with the lower surface 231 (the notch step portion 234) in a state parallel to the lower surface 231 of the lower core 23.

  A bent portion obtained by bending the holding leg portion 32 at a substantially right angle is formed on the outer side of the support portion 323, and a curved surface having a curvature radius of, for example, about 1 to 2 mm is formed on the inner side surface. The lower core 23 is disposed at a position away from the lower corner portion 233. That is, the clearance forming portion 322 is formed between the support portion 323 and the side contact portion 321, and a clearance is formed between the lower corner portion 233 and the holding leg portion 32. Yes.

  In forming the magnetic component unit 1 of this example, first, as shown in FIGS. 5 and 6, the magnetic component 2 in a state where the coil 21 is sandwiched between the upper core 22 and the lower core 23 from above and below is configured. A spring holder 3 is attached to the magnetic component 2. When mounting the spring holder 3, as shown in FIG. 5, the holding leg 32 in the spring holder 3 is deformed so as to spread outward. At this time, the leaf spring portion 31 and the shared leg portion 34 are also slightly deformed, but the holding leg portion 32 is greatly deformed. The deformation is performed until at least the distance between the pair of side surface abutting portions 321 is larger than the width of the magnetic component 2.

In this state, the holding leg portion 32 is restored while the lower surface of the leaf spring portion 31 is pressed against the upper surface 221 of the upper core 22, and the side contact portion 321 is moved to the side surface 222 of the upper core 22 and the side surface 232 of the lower core 23. The support portion 323 is disposed below the lower core 23.
Next, by restoring the leaf spring portion 31, the support portion 323 is engaged with the notch step portion 234 on the lower surface 231 of the lower core 23.
Thus, the magnetic component unit 1 shown in FIG. 1 is assembled.

Then, as shown in FIGS. 7 and 8, the magnetic component unit 1 is housed and fixed in the housing 4.
The housing 4 includes a bottom plate portion 410 having a mounting surface 41 on which the magnetic component 2 is mounted, and a wall portion 420 erected from the bottom plate portion 410, and a screw hole 43 is cut from the upper surface of the wall portion 420. ing. That is, the upper surface of the wall 420 serves as the fastening surface 42 that fastens and fixes the fixed leg 33.

In assembling the magnetic component unit 1 to the housing 4, as shown in FIG. 7, first, the magnetic component unit 1 is mounted to the housing 4 so that the lower surface 231 of the lower core 23 is in surface contact with the mounting surface 41 of the housing 4. Place in.
Here, as shown in FIG. 9, the fixed leg portion 33 has a positioning engagement portion 334 that engages with a positioning projection 421 provided on the fastening surface 42 in the housing 4. The positioning engaging portion 334 is formed in a state constricted inward from both sides in the width direction of the flange portion 332 of the fixed leg portion 33.
On the other hand, the positioning projection 421 is a cylindrical pin that protrudes upward from the fastening surface 421 of the housing 4. Two positioning protrusions 421 are formed for one flange portion 332.

When the magnetic component unit 1 is placed in the housing 4, the pair of positioning engagement portions 334 formed on the flange portion 332 engages with the two pairs of positioning projections 421. Thereby, the magnetic component unit 1 is positioned with respect to the housing 4 in the horizontal direction.
Further, in this state, the flange portions 332 of the pair of fixed leg portions 33 are in a state of floating from the fastening surface 42 of the housing 4.

Next, the screw 11 as the fastening member is inserted into the through hole 333 formed in the flange portion 332 and screwed into the screw hole 43 formed in the wall portion 420.
As a result, as shown in FIG. 8, the flange portion 43 contacts the fastening surface 42, and the leaf spring portion 31 is deformed to increase its biasing force (restoring force), that is, the upper surface 221 of the upper core 22, that is, the magnetic component. The top surface of 2 is pressed. Accordingly, the lower surface 231 of the lower core 23, that is, the lower surface of the magnetic component 2 is pressed against the mounting surface 41.
As a result, the magnetic component 2 is firmly fixed to the housing 4 by the fixing function of the spring holder 3.

  Further, as the leaf spring portion 31 is deformed, the holding leg portion 32 is lowered. Thereby, the support part 323 descend | falls and leaves | separates from the lower surface 231 (notch step part 234) of the lower core 23. FIG. Therefore, in this state, the holding function of the spring holder 3 does not work, but the holding function is unnecessary because the magnetic component 2 is integrally fixed to the housing 4 by the fixing function.

Further, as the holding leg portion 32 is lowered, the side surface abutting portion 321 is also lowered. Even in this state, the side surface abutting portion 321 has both the side surface 222 of the upper core 22 and the side surface 232 of the lower core 23. Is in contact.
Thus, the magnetic component fixing structure 10 in which the magnetic component 2 is fixed to the housing 4 by the spring holder 3 is formed.

Next, the function and effect of this example will be described.
The spring holder 3 realizes the holding function by the leaf spring portion 31 and the holding leg portion 32, and realizes the fixing function by the leaf spring portion 31 and the fixed leg portion 33. That is, the holding function and the fixing function can be realized by using the common leaf spring portion 31. Therefore, the material cost of the spring holder 3 can be reduced.

  The spring holder 3 includes a leaf spring portion 31, a pair of holding leg portions 32 and a pair of fixed leg portions 33 that respectively hang down from both ends of the leaf spring portion 31. Thereby, the deformation amount of the leaf | plate spring part 31 at the time of fixing the magnetic component unit 1 to the housing | casing 4 which is a to-be-fixed body can be made small.

  That is, the state of the magnetic component unit 1 in which the spring holder 3 is mounted on the magnetic component 2 (FIG. 1), that is, the leaf spring portion 31 is pressed against the upper surface 221 of the upper core 22 and the holding leg portion 32 is the lower surface 231 of the lower core 23. In the state engaged with, the leaf spring portion 31 has already been deformed to some extent from the free state (FIG. 4). Therefore, as shown in FIGS. 7 and 8, when the magnetic component unit 1 is fixed to the housing 4, the leaf spring portion 31 that has already been deformed to some extent is only further deformed in the same direction. The amount of deformation of the leaf spring portion 31 can be reduced.

That is, the plate spring portion 31 in the free state is not deformed at a stretch, but is deformed to some extent when the magnetic component unit 1 is configured, and can be deformed step by step.
Therefore, when the magnetic component unit 1 is fixed to the housing 4, it is not necessary to greatly deform the leaf spring portion 31, and accordingly, it is not necessary to greatly displace the fixed leg portion 32, and assembling to the housing 4 is easy. Can be done.

  And even if it does not enlarge displacement of the leaf | plate spring part 31 at this time, the magnetic component unit 1 can be pressed to the housing | casing 4 with big force. Therefore, the magnetic component 2 can be pressed against the housing 4 with a sufficient force, and the heat dissipation and vibration resistance of the magnetic component 2 through the housing 4 can be sufficiently ensured.

As shown in FIG. 1, the holding leg portion 32 is formed by projecting a side contact portion 321 inward. Therefore, it is possible to prevent the lower core 23 from shifting in the horizontal direction of the magnetic component 2 with respect to the spring holder 3 (direction perpendicular to the winding axis direction).
The holding leg portion 32 has a clearance forming portion 322 and forms a clearance on the side of the lower corner portion 233 of the lower core 23. Thereby, it is possible to prevent the inner surface of the bent portion of the support portion 323 in the holding leg portion 32 from interfering with the lower corner portion 233. Therefore, it is possible to effectively prevent the lower core 23 from cracking from the lower corner portion 233.

That is, if there is no clearance forming portion 322, the lower corner portion 233 of the lower core 23 may ride on the bent portion 329 of the support portion 323 in the holding leg portion 32 as shown in FIG. That is, since the support portion 323 is formed by bending a metal plate, a curved surface having a curvature radius of about 1 to 2 mm is formed on the inner surface of the bent portion 329, for example. On the other hand, since the lower core 322 often does not chamfer, the lower corner portion 233 has a so-called pin angle. When the lower corner portion 233 of this pin angle rides on the bent portion 329, stress concentrates on the lower corner portion 233, and there is a possibility that the lower core 23 may crack from this point. As a result, the magnetic characteristics of the magnetic component 2 may be affected.
Therefore, as shown in FIG. 1, by forming the clearance forming portion 322, the spring holder 3 can be prevented from coming into contact with the lower corner portion 233, thereby preventing the above-described problems.

Further, since the spring holder 3 is biased in the direction in which the pair of holding leg portions 32 approach each other, the magnetic component 32 can be positioned more reliably. Moreover, since the support part 323 can be made to contact with the lower surface 231 of the lower core 23 more reliably, the holding function can be exhibited reliably.
Further, since the side surface abutting portion 321 is in contact with both the lower core 23 and the upper core 22, both the lower core 23 and the upper core 22 can be accurately positioned.

  Further, the lower core 23 forms a notch step portion 234, and the support portion 323 of the spring holder 3 is disposed in the notch step portion 234. Thereby, it is possible to prevent the support portion 323 from interfering with the mounting surface 41 of the housing 4. Further, unlike the second embodiment to be described later, it is not necessary to form a relief portion (see reference numeral 411 in FIG. 11) on the mounting surface 41, so that the configuration of the housing 4 can be simplified.

Further, as shown in FIG. 3, since a part of the holding leg part 32 and a part of the fixed leg part 33 share the common leg part 34, the elastic force of the leaf spring part 31 is sufficiently ensured. Can do.
Further, the holding leg portion 32 and the fixed leg portion 33 branch from each other from the lower end of the common leg portion 34 and extend further downward. Therefore, as shown in FIG. 5, the holding leg 32 can be deformed independently from the fixed leg 33, so that the force required for the deformation is small and the mounting of the spring holder 3 to the magnetic component 2 is easy. It can be carried out.

  Further, since the holding leg portion 32 and the fixed leg portion 33 are formed in pairs, the structure of the spring holder 3 can be simplified, the mounting to the magnetic component 2 is facilitated, and the material of the spring holder 3 is made. Costs and processing costs can be reduced.

Further, the rigidity of the holding leg portion 32 is equal to or less than the rigidity of the leaf spring portion 31. Therefore, when the spring holder 3 is mounted on the magnetic component 2, the deformation of the leaf spring portion 31 can be suppressed and the holding leg portion 32 can be largely deformed, so that the mountability to the magnetic component 2 is further improved. Can do.
Moreover, since excessive deformation of the leaf spring portion 31 can be avoided, a sufficient restoring force of the leaf spring portion 31 after the spring holder 3 is mounted on the magnetic component 2 can be secured, and the magnetic component 2 by the spring holder 3 can be secured. The holding force and the fixing force to the housing 4 can be ensured.

  As shown in FIG. 8, in the magnetic component fixing structure 10 in which the magnetic component unit 1 is fixed to the housing 4, the support portion 323 of the holding leg portion 32 is separated from the lower surface 231 (the notch step portion 234) of the lower core 23. ing. Therefore, the urging force of the leaf spring portion 31 directly becomes the pressure contact force of the magnetic component 2 against the housing 4. Therefore, the magnetic component 2 is fixed in a state in which it is firmly pressed against the housing 4, and a stable magnetic component fixing structure 10 can be obtained.

The through-hole 333 provided in the flange portion 332 of the fixed leg portion 33 is a long hole that is long in the protruding direction of the flange portion 332. Therefore, even if the dimensional accuracy of the spring holder 3 with respect to the housing 4 is not particularly high, the spring holder 3 can be easily fixed to the housing 4. That is, the spring holder 3 is formed with a large number of bent portions, and in a state where the upper core 22 and the lower core 23 are sandwiched, the spring holder 3 is in a state of being deformed from the free state, and is particularly parallel to the protruding direction of the flange portion 332. Dimensional accuracy in any direction tends to be low. Therefore, when the through hole 333 is a long hole extending in the protruding direction of the flange portion 332, the fastening member 11 can be easily inserted into the through hole 333 when the spring holder 3 holding the magnetic component 2 is fixed to the housing 4. Can be made.
In particular, when the magnetic component 2 is automatically assembled to the housing 4, the displacement of the through-hole 333 with respect to the housing 4 greatly affects the production efficiency. Therefore, the through-hole 333 is a long hole. The effect by this can be exhibited especially.

  In addition, the fixed leg portion 33 has a positioning engagement portion 334 that engages with a positioning projection 421 provided on the fastening surface 41 in the housing 4. Therefore, before the spring holder 3 holding the magnetic component 2 is fastened and fixed to the housing 4 by the fastening member 11, first, as shown in FIG. 9, the positioning engaging portion 334 is engaged with the positioning protrusion 421. Accordingly, the spring holder 3 holding the magnetic component 2 can be positioned with respect to the housing 4. Thereby, both can be fastened and fixed easily.

  In addition, as described above, the positioning engaging portion 334 is engaged with the positioning protrusion 421, so that the magnetic component 2 is placed in the housing 4 and before it is fastened and fixed. Can be prevented from shifting. For example, the housing 4 on which the magnetic component 2 is placed may be conveyed after the magnetic component 2 is arranged in the housing 4 and before being fastened and fixed. At this time, it is also conceivable that the magnetic component 2 and the housing 4 are displaced due to the vibration accompanying the conveyance, and the position of the spring holder 3 with respect to the housing 4 is displaced. However, as described above, by engaging the positioning engaging portion 334 with the positioning protrusion 421, the two can be prevented from shifting and the fastening and fixing of both can be performed smoothly.

  As described above, according to this example, it is possible to provide a low-cost magnetic component unit and a magnetic component fixing structure that are excellent in assembling to a fixed body (housing) and hardly cause core cracks.

(Example 2)
In this example, as shown in FIG. 11, a relief portion 411 for avoiding interference with the support portion 323 of the holding leg portion 32 is formed on the mounting surface 41 of the housing 4.
The escape portion 411 is formed in a part of the inside of the wall portion 420 in the housing 4 so as to be recessed downward from the mounting surface 41. A lower corner portion 233 of the lower core 23 is disposed above the relief portion 411, and a support portion 323 is disposed within the relief portion 411 below the lower corner portion 233.
In the present example, the lower core 23 is not formed with the notch step 234 (see FIG. 8). Accordingly, notch step 224 (see FIG. 8) is not formed on upper core 22 either.
Others are the same as in the first embodiment.

In the case of this example, it is not particularly necessary to form the notch step 234 (see FIG. 8) in the lower core 23.
Further, in this example, similarly to the first embodiment, a cut step portion 234 (see FIG. 8) may be formed in the lower core 23 (not shown).
In this case, the arrangement space of the support portion 323 can be increased by forming the relief portion 411. As a result, the amount of deformation of the leaf spring portion 31 when the magnetic component unit 1 is fixed to the housing 4 can be increased, and the degree of design freedom is improved.
In addition, the same effects as those of the first embodiment are obtained.

(Example 3)
In this example, as shown in FIG. 12, a folded portion 324 formed by folding the inner end portion of the support portion 323 in the holding leg portion 32 of the spring holder 3 from the lower side toward the outer side is provided.
That is, the folded portion 324 is bent at 90 ° or more with respect to the support portion 323.
Others are the same as in the first embodiment.

In the case of this example, when the spring holder 3 is mounted on the magnetic component 2, the inner side surface of the folded portion 324 is slid on the side surfaces 222 and 232 of the upper core 22 and the lower core 23, and the support portion 323 is lowered. It can be engaged with the lower surface 231 of the core 23. Therefore, the assembly of the spring holder 3 to the magnetic component 2 can be easily performed.
In addition, the same effects as those of the first embodiment are obtained.

Example 4
In this example, as shown in FIGS. 13 and 14, side groove portions 24 that are continuous in the vertical direction are provided on the side surfaces 222 and 232 of the upper core 22 and the lower core 23.
And in this side groove part 24, as shown in FIG. 14, the side surface contact part 321 in the spring holder 3 is in contact with the side surfaces 222 and 232 of the upper core 22 and the lower core 23.
Others are the same as in the first embodiment.

In the case of this example, the side groove portion 24 serves as a guide for the side contact portion 321, and as shown in FIG. 13, the spring holder 3 can be positioned more accurately in the width direction when viewed from the upper surface.
In addition, the same effects as those of the first embodiment are obtained.

(Example 5)
In this example, as shown in FIGS. 15 and 16, two upper cores 22 are provided.
As in the first embodiment, the number of the lower cores 23 is one.
The magnetic component unit 1 is formed by mounting two spring holders 3 on the magnetic component 2 corresponding to the two upper cores 22. One spring holder 3 holds the lower core 23 and one upper core 22 with a leaf spring portion 31 and a holding leg portion 32, and the other spring holder 3 holds the lower core 23 and the other upper core 22 with a leaf spring. It is held by the portion 31 and the holding leg portion 32.
The two spring holders 3 are arranged in parallel with the holding leg portion 32 on the inside and the fixed leg portion 33 on the outside.
Others are the same as in the first embodiment.

In the case of this example, the magnetic component 2 having the two upper cores 22 can be stably held and fixed to the housing 4.
In addition, the same effects as those of the first embodiment are obtained.
Note that the number of the lower cores 23 may be plural, and the number of the upper cores 22 may be three or more. In this case, it is preferable to arrange a plurality of spring holders 3 corresponding to the number of cores.

The upper core 22 and the lower core 23 are so-called EE in which the cross-sectional shapes (see FIG. 1 and the like) of the upper core 22 and the lower core 23 are substantially E-shaped as shown in the first to fourth embodiments. Various types other than the types can be applied. For example, an EI type in which one core does not have the central leg 228 (238) and the outer peripheral leg 229 (239), or one or both cores do not have the central magnetic leg 228 (238). It can be a UI type or a UU type as a type.
Moreover, in the said Examples 1-5, although the magnetic component 2 showed the example which is a transformer, this invention is applied not only to a transformer but other magnetic components, such as a choke coil and a reactor, for example. Can do.

DESCRIPTION OF SYMBOLS 1 Magnetic component unit 10 Magnetic component fixed structure 2 Magnetic component 21 Coil 22 Upper core 221 Upper surface 23 Lower core 231 Lower surface 232 (Lower core) side surface 233 Lower side corner 3 Spring holder 31 Leaf spring portion 32 Holding leg 321 Side contact Part 322 Clearance forming part 323 Bearing part 33 Fixed leg part 4 Case

Claims (12)

A magnetic component having an upper core and a lower core arranged opposite to each other, and a coil arranged so that magnetic paths formed by the upper core and the lower core are linked, and
A spring holder having both a holding function for holding the magnetic part and a fixing function for fixing the magnetic part to a fixed body;
The spring holder includes a leaf spring portion that is pressed against the upper surface of the upper core, at least a pair of holding leg portions that hang from both ends of the leaf spring portion and engage the lower surface of the lower core, and both ends of the leaf spring portion. And at least a pair of fixed legs that hang down from and project outward.
The holding function of the spring holder is realized by the leaf spring part and the holding leg part,
The fixing function of the spring holder is realized by the leaf spring part and the fixing leg part,
The holding leg includes a side contact portion that protrudes inward and contacts the side surface of the lower core, and a clearance that forms a clearance on the side of the lower corner portion of the lower core below the side surface contact portion. A magnetic component unit comprising a forming portion and a support portion for supporting the lower surface of the lower core.   2. The magnetic component unit according to claim 1, wherein the spring holder is urged in a direction in which the pair of holding legs approach each other.   3. The magnetic component unit according to claim 1, wherein the side contact portion is in contact with both the lower core and the upper core.   The magnetic component unit according to any one of claims 1 to 3, wherein the lower core is formed with a notch step portion on at least a part of an outer periphery of the lower surface, and the notch step portion includes the spring holder. A magnetic component unit configured to be provided with a support portion.   5. The magnetic component unit according to claim 1, wherein a part of the holding leg part and a part of the fixed leg part share a common leg part suspended from both ends of the leaf spring part. 6. A magnetic component unit characterized by   6. The magnetic component unit according to claim 5, wherein the holding leg portion and the fixed leg portion branch from each other from the lower end of the common leg portion and extend further downward.   The magnetic component unit according to claim 1, wherein the holding leg portion and the fixed leg portion are formed in pairs.   The magnetic component unit according to claim 1, wherein the holding leg portion has a rigidity equal to or less than a rigidity of the leaf spring portion.   9. The magnetic component unit according to claim 1, wherein the fixed leg portion has a flange portion protruding outward, and the spring holder is fastened to the fixed body on the flange portion. A through hole for inserting a fastening member to be formed is formed, and the through hole is a long hole extending in the protruding direction of the flange portion. A magnetic component fixing structure formed by fixing the magnetic component unit according to any one of claims 1 to 9 to the fixed body,
The fixed body has a mounting surface on which the magnetic component is mounted, and a fastening surface for fastening and fixing the fixed leg.
The fixed leg portion is fastened and fixed to the fastening surface by a fastening member,
The lower surface of the lower core is in pressure contact with the mounting surface,
The magnetic part fixing structure according to claim 1, wherein the support portion of the holding leg portion is separated from a lower surface of the lower core.   The magnetic component fixing structure according to claim 10, wherein an escape portion for avoiding interference with the support portion of the holding leg portion is formed on the mounting surface of the fixed body. Magnetic component fixing structure.   12. The magnetic component fixing structure according to claim 10, wherein the fixed leg portion has a positioning engagement portion that engages with a positioning projection provided on the fastening surface of the fixed body. Magnetic component fixing structure.

Images