JP2010010452A - Fixture of transformer core - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate the release heat generated by a transformer to a heat sink through a bracket. <P>SOLUTION: A bracket 12 surrounding a transformer core 14 mounted to a heat sink 13 is provided with a holding part 12a that is formed on the transformer core 14 to be able to adhere thereto and a heat transmitting part 12b that is extended to the heat sink 13 side from both ends of the holding part 12a. The lower end (fixed part 12c) of each heat transmitting part 12b is fixed to a connecting member 16 sliding in a through-hole 17 formed in the heat sink 13. Moreover, free ends of a leaf spring 19 are fixed to the connecting member 16. Furthermore, the central part of the leaf spring 19 is fixed to the opposite surface 13b of the heat sink 13 to form a base end. The transformer core 14 is sandwiched between the holding part 12a of the bracket 12 urged to the heat sink 13 side by the leaf spring 19 and the mounting surface 13a of the heat sink 13 to be fixed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a transformer core fixture for fixing a transformer core constituting a transformer to a heat radiating member.

  Conventionally, a transformer (transformer) is mounted on an inverter provided with a heat sink (heat radiating member). The transformer core constituting the transformer is fixed to the heat sink using a bracket in a state where the primary and secondary windings are assembled. In general, it is known that a transformer generates heat due to power loss when converting a voltage, and heat generated is radiated by, for example, bringing a transformer core into close contact with a heat sink. By the way, transformer cores made of ferrite manufactured by a sintering method are widely used as transformers. A transformer core manufactured by a sintering method has a large variation in outer dimensions, and a bracket having a spring mechanism that suppresses a gap between the transformer core and a heat sink due to the variation in the outer dimension has been proposed. (For example, Patent Document 1).

As shown in FIG. 6, in Patent Document 1, a transformer 62 (each transformer core 63 a and 63 b) is fixed to a heat sink (metal casing) 61 by a bracket 64. The bracket 64 is formed of a plate-like top plate portion 64a and side wall portions 64b extending downward from both ends of the top plate portion 64a. The bracket 64 fixes the respective transformer cores 63a and 63b to the heat sink 61 by fixing the lower end portions of the side wall portions 64b with screws (not shown). Moreover, the substantially center part of the top plate part 64a of the bracket 64 protrudes in an arc shape toward the lower side (the transformer cores 63a and 63b side), thereby forming a spring mechanism. For this reason, the bracket 64 can be fixed in a state in which the top plate portion 64a bends in the vertical direction to absorb variations in the outer dimensions of the transformer cores 63a and 63b and the transformer core 63b is in close contact with the heat sink 61. It has become.
JP 2001-143938 A

  However, in Patent Document 1, since the top plate portion 64a has an arc shape protruding downward, a gap 66 is generated between the top plate portion 64a and the transformer core 63a disposed on the upper side. For this reason, the contact area between the transformer core 63a and the top plate portion 64a (bracket 64) is small, and heat is not easily transmitted from the transformer core 63a to the top plate portion 64a. That is, Patent Document 1 has a problem that heat generated in the transformer 62 is difficult to dissipate from the transformer core 63 a to the heat sink 61 via the bracket 64.

  The present invention has been made paying attention to such problems existing in the prior art, and its purpose is to fix the transformer core that can easily release the heat generated in the transformer to the heat sink through the bracket. It is in providing tools.

  In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that the bracket that forms a heat transfer path by connecting a tip portion of a bracket surrounding a transformer core placed on a heat radiating member to the heat radiating member; A transformer core fixture for fixing the transformer core to a heat radiating member, wherein a through hole is formed in a connecting portion of the bracket in the heat radiating member, and the bracket is placed on the heat radiating member side through the through hole. The gist is that the transformer core is brought into close contact with the bracket.

  According to this, the transformer core is fixed between the heat radiating member and the bracket urged toward the heat radiating member through the through hole formed in the connecting portion of the bracket in the heat radiating member. For this reason, even if the outer dimensions of the transformer core are not uniform, the transformer core can be fixed to the heat dissipation member. At this time, when the bracket and the transformer core are brought into close contact with each other, the contact area with the transformer core is increased, and the amount of heat transferred from the transformer core to the bracket is increased. Therefore, heat generated in the transformer is easily transmitted from the transformer core to the heat radiating member through the bracket, and heat dissipation of the transformer core is promoted.

  According to a second aspect of the present invention, in the transformer core fixture according to the first aspect, a connecting member is slidably disposed in the through hole, and the mounting surface of the transformer core in the heat radiating member; On the opposite surface, a base end of a leaf spring for urging the bracket toward the heat radiating member is fixed, the bracket is fixed to one end of the connecting member, and the plate is fixed to the other end of the connecting member. The gist is that the free end of the spring is fixed.

  According to this, a bracket is urged | biased to the heat radiating member side by the leaf | plate spring connected via the connection member. That is, the urging force of the leaf spring whose base end is fixed to the opposite surface of the heat radiating member is transmitted to the bracket via the connecting member.

  According to a third aspect of the present invention, in the transformer core fixture according to the first aspect, a compression coil spring for urging the bracket toward the heat radiating member is disposed in the through hole, and the compression The gist is that one end of the coil spring is connected to the heat radiating member and the other end of the compression coil spring is connected to the bracket.

  According to this, the bracket can be biased toward the heat radiating member by the compression coil spring disposed in the through hole.

  According to the present invention, the heat generated in the transformer can be easily released to the heat sink through the bracket.

(First embodiment)
A first embodiment embodying the present invention will be described below with reference to FIGS.
As shown in FIGS. 1 and 2, the transformer 11 of this embodiment includes a transformer core 14, and a winding 15 is wound around the transformer core 14. The transformer core 14 converts the input AC power voltage into a predetermined voltage and outputs it. The transformer core 14 is configured by arranging an upper core 14a and a lower core 14b formed in a substantially E shape in a side view so as to face each other. In the present embodiment, the upper core 14a and the lower core 14b are ferrite cores formed by a sintering method. A space K around which the winding 15 is wound is formed between the upper core 14a and the lower core 14b. The transformer core 14 is placed on a heat sink 13 as a heat radiating member.

The fixture for the transformer core 14 includes a bracket 12, a connecting member 16, and a leaf spring 19.
The bracket 12 disposed so as to surround the transformer core 14 will be described.

  The bracket 12 of this embodiment is formed by bending a rectangular plate-like metal (for example, iron or copper). The bracket 12 is formed in a flat plate shape so as to be in contact with the upper surface of the upper core 14a, and extends from both ends of the holding portion 12a toward the heat sink 13 (lower core 14b). From the heat transfer part 12b, it is formed in a substantially reverse channel shape in a side view. The holding portion 12a of the bracket 12 has a shape corresponding to the upper surface of the upper core 14a, and is configured to be able to be in close contact with the upper core 14a. Specifically, in the present embodiment, the upper surface of the upper core 14a forms a flat surface, while the holding portion 12a is formed in a flat plate shape having a flat surface so as to correspond to the flat surface (upper surface) of the upper core 14a. ing. The holding portion 12a is configured such that substantially the entire surface disposed on the upper core 14a side is in close contact (contact) with the upper surface of the upper core 14a. The length of the heat transfer part 12b is set to a length that does not contact the heat sink 13 when the holding part 12a is brought into close contact with the upper core 14a.

  Moreover, each connection part of the holding | maintenance part 12a and the heat-transfer part 12b is each provided with the connection part 12e which makes a side view circular arc shape. In the present embodiment, the connection part 12e constitutes a part of the heat transfer part 12b. Each connection portion 12e is configured to bias the entire heat transfer portion 12b toward the side surface of the transformer core 14 with the connection portion 12e as a base point. And each heat-transfer part 12b is closely_contact | adhered to the side surface of the transformer core 14. FIG.

  Further, the lower end (tip) portion of the heat transfer portion 12b is bent at a substantially right angle toward the side to form a flat plate-like fixing portion 12c. The fixing portion 12 c is formed so as to be substantially parallel to the heat sink 13. The fixing portion 12c is provided with an insertion hole 12d through which a bolt B1 for fixing (connecting) the bracket 12 to the heat sink 13 is inserted.

Next, the heat sink 13 to which the transformer core 14 (transformer 11) is fixed will be described.
The heat sink 13 is made of metal (for example, aluminum), and a fluid path S through which a fluid passes as a cooling medium is formed inside the heat sink 13. In this embodiment, water is used as the cooling medium. The heat sink 13 dissipates (cools) heat by removing heat transmitted from the transformer core 14 (transformer 11) or the like to the heat sink 13 by the fluid passing through the fluid path S.

  In the heat sink 13, two through holes 17 penetrating the heat sink 13 are formed in a portion where the heat transfer portion 12 b (fixed portion 12 c) of the bracket 12 is fixed. In addition, each through-hole 17 is comprised in the heat sink 13 by the wall part 13c which makes the mounting surface 13a in which the transformer core 14 is mounted, and a pair of hole which penetrates the wall part 13d which makes the opposite surface 13b of the mounting surface 13a, respectively. Has been. The separation distance of each through-hole 17 is set so as to correspond to the separation distance of the insertion hole 12 d formed in each fixing portion 12 c of the bracket 12.

  Each through hole 17 is provided with a columnar connecting member 16 that slides on the inner wall surface of the through hole 17. Each connecting member 16 is made of a material having excellent thermal conductivity (for example, aluminum or copper), and functions as a part of the heat sink 13. In addition, each connecting member 16 is exposed to the inside of the fluid path S so that the fluid passing through the inside of the fluid path S comes into contact therewith. Each connecting member 16 is provided with an O-ring 18 at a position corresponding to the through hole 17 formed in the wall 13c and the wall 13d. The O-ring 18 prevents the fluid passing through the fluid path S from leaking from between the connecting member 16 and the through hole 17.

  Of the end portions of each connecting member 16, the heat transfer portion 12 b (fixed portion 12 c) of the bracket 12 is fixed (connected) by the bolt B <b> 1 to the end portion located on the mounting surface 13 a side of the heat sink 13. It has become. The lower end portion (fixed portion 12c) of the heat transfer portion 12b of the bracket 12 and the end portion of the connecting member 16 are in close contact with each other.

  For this reason, in this embodiment, heat can be transmitted from the holding portion 12a of the bracket 12 to the heat sink 13 (the connecting member 16) by the heat transfer portion 12b. That is, the bracket 12 of this embodiment forms a heat transfer path for transferring heat from the transformer core 14 to the heat sink 13. Further, the heat transmitted to the connecting member 16 can be transmitted from the contact portion between the connecting member 16 and the through hole 17 to the respective wall portions 13 c and 13 d of the heat sink 13.

  A leaf spring 19 is disposed on the lower surface (opposite surface 13 b) of the heat sink 13. A fixing hole 19 a is provided in the center of the leaf spring 19. The leaf spring 19 is fixed to the opposite surface 13b of the heat sink 13 by inserting a boss portion 20 protruding from the opposite surface 13b of the heat sink 13 through the fixing hole 19a. That is, the fixing hole 19 a of the leaf spring 19 forms the base end portion of the leaf spring 19. The boss portion 20 is disposed in the middle (center) of each through-hole 17. The leaf spring 19 is disposed substantially in parallel with the opposite surface 13 b of the heat sink 13.

  Of the end portions of each connecting member 16, the end portion (free end) of the leaf spring 19 is fixed to the lower end, that is, the end portion located on the opposite surface 13b side of the heat sink 13. More specifically, insertion holes 19b are formed at both ends of the plate spring 19, and both ends of the plate spring 19 are fixed to the connecting member 16 by bolts B2 inserted through the insertion holes 19b. It has become.

Next, the operation of the fixture of the transformer core 14 in this embodiment will be described.
The leaf spring 19 of the present embodiment is opposite to the heat sink 13 with the fixing hole 19a (boss portion 20) as a base point, as shown by a two-dot chain line in FIG. 2, in a state where the leaf spring 19 is not fixed to the connecting member 16 by the bolt B2. It is in a state of warping so that both ends are separated from the surface 13b. For this reason, when both ends of the leaf spring 19 are fixed to the coupling member 16 by the bolts B <b> 2, the leaf spring 19 causes each coupling member 16 to be opposed to the opposite surface from the mounting surface 13 a side of the heat sink 13 by the biasing force (restoring force). It is urged toward the 13b side.

  By urging each connecting member 16 by the leaf spring 19, the entire bracket 12 fixed to each connecting member 16 with the bolt B <b> 1 is urged toward the heat sink 13. That is, the bracket 12 is urged toward the heat sink 13 by the leaf spring 19 through the through hole 17 in which the connecting member 16 is disposed. The length of the heat transfer portion 12b is set to a length that does not contact the heat sink 13 when the holding portion 12a is brought into close contact with the upper core 14a. For this reason, the transformer core 14 is sandwiched between the holding portion 12 a of the bracket 12 and the mounting surface 13 a of the heat sink 13 and is fixed to the heat sink 13. A gap 21 is formed between the heat transfer portion 12 b (fixed portion 12 c) of the bracket 12 and the heat sink 13.

  In this state, the lower core 14b and the mounting surface 13a of the heat sink 13 are in close contact with each other. For this reason, the heat generated in the transformer 11 is easily transmitted from the lower core 14 b to the heat sink 13, and heat dissipation of the transformer core 14 is promoted.

  Further, the holding portion 12a of the bracket 12 and the upper core 14a are in close contact with each other. For this reason, the heat generated in the transformer 11 is easily transferred from the upper core 14a to the holding portion 12a. The heat transferred to the holding part 12a is transferred to the connecting member 16 (heat sink 13) via each heat transfer part 12b. The heat transmitted to the connecting member 16 is taken away by the fluid that contacts the connecting member 16 and radiated. Further, the heat transmitted to the connecting member 16 is transmitted to the wall portions 13c and 13d of the heat sink 13 and radiated.

  Further, since the bracket 12 sandwiches the transformer core 14 by the urging force of the leaf spring 19, even if the outer dimensions (thickness along the vertical direction) of the transformer core 14 are different, the transformer core 14 is attached to the heat sink 13. Can be fixed to.

Therefore, according to the present embodiment, the following effects can be obtained.
(1) The holding portion 12a of the bracket 12 has a shape corresponding to the upper surface of the upper core 14a, and the entire bracket 12 is urged toward the heat sink 13. For this reason, the transformer core 14 is sandwiched between the holding portion 12 a of the bracket 12 and the mounting surface 13 a of the heat sink 13 and is fixed to the heat sink 13. In general, it is known that a ferrite core manufactured by a sintering method has a large variation in outer dimensions. According to this embodiment, even if the outer dimensions of the transformer core 14 are not uniform, the holding portion 12a and the upper core 14a can be fixed to the heat sink 13 while being in close contact with each other. Therefore, the heat generated in the transformer 11 can be easily released to the heat sink 13. Further, it is not necessary to provide the bracket 12 itself with a spring mechanism for absorbing the non-uniformity of the outer dimensions of the transformer core 14. Therefore, while simplifying the structure of the bracket 12, it can suppress that the transformer 11 including the bracket 12 enlarges.

  (2) The holding portion 12a has a shape corresponding to the upper surface of the upper core 14a, and is configured so that substantially the entire surface disposed on the upper core 14a side is in close contact (contact) with the upper surface of the upper core 14a. . For this reason, the contact area between the transformer core 14 and the holding part 12a is increased, and the amount of heat transferred from the transformer core 14 (upper core 14a) to the holding part 12a is increased. Therefore, the heat generated in the transformer 11 is easily transmitted from the upper core 14a to the heat sink 13 via the bracket 12 (the holding portion 12a and the heat transfer portion 12b), and heat dissipation of the transformer core 14 is promoted. The heat generated by the transformer 11 can be reliably transmitted to the heat sink 13.

  (3) The leaf spring 19 is disposed on the opposite surface 13 b side of the heat sink 13, and the urging force of the leaf spring 19 is transmitted to the bracket 12 via the connecting member 16. For this reason, the whole of the bracket 12 can be biased toward the heat sink 13 by the leaf spring 19. Moreover, since the leaf | plate spring 19 is arrange | positioned substantially in parallel with the opposite surface 13b of the heat sink 13, it can suppress that the heat sink 13 enlarges.

  (4) Each connecting member 16 is exposed to the fluid path S of the heat sink 13. For this reason, the fluid which cools the heat sink 13 contacts the connection member 16, and can heat-dissipate each connection member 16 compulsorily. Therefore, the heat transmitted from the holding portion 12a of the bracket 12 can be quickly dissipated, and the heat dissipation of the transformer core 14 can be promoted.

(Second Embodiment)
Next, a second embodiment embodying the present invention will be described with reference to FIGS. In the following description, the same reference numerals are given to the same configurations as those of the already described embodiments, and the overlapping description is omitted or simplified.

  As shown in FIG. 3, the heat sink 13 of the present embodiment is formed with two cylindrical portions 26 that connect the wall portion 13c on the mounting surface 13a side and the wall portion 13d on the opposite surface 13b side in the fluid path S. Yes. The inner wall surface of each cylindrical portion 26 forms a through hole 17 that penetrates the heat sink 13. In the present embodiment, the through hole 17 and the fluid path S are not communicated with each other, and the fluid that passes through the fluid path S is not leaked.

  Each through-hole 17 is provided with a guide groove 17a cut out in a groove shape from the opening on the opposite surface 13b side of the heat sink 13. Each through hole 17 is provided with a movable piece 27 that is formed in a substantially disc shape and moves along the inner wall surface of the through hole 17. As shown in FIGS. 3 and 4, a rib portion 27 a that can be engaged with the guide groove 17 a is provided upright on the side surface of the movable piece 27. The movable piece 27 is prevented from rotating in the circumferential direction by engaging the rib portion 27a with the guide groove 17a. The movable piece 27 is movable within the range where the guide groove 17a is formed. For this reason, the movable piece 27 is always positioned on the opposite surface 13 b side of the heat sink 13.

  A compression coil spring 28 is disposed in each through hole 17. The compression coil spring 28 is fixed to the upper part of the movable piece 27 and is connected to the heat sink 13. Further, the upper end of the compression coil spring 28 is fixed to a pin 29 fixed to the lower end portion (fixed portion 12 c) of the heat transfer portion 12 b of the bracket 12.

  A screw hole 27b into which the adjustment bolt B3 is screwed is provided at the lower portion of the movable piece 27. The head of the adjustment bolt B3 is larger than the through hole 17. The movable piece 27 can be moved to the opposite surface 13b side of the heat sink 13 by screwing the adjustment bolt B3 into the screw hole 27b.

  A heat dissipation sheet 25 is disposed between the holding portion 12a of the bracket 12 and the upper core 14a. The heat dissipation sheet 25 is formed of a material having excellent thermal conductivity and flexibility. Further, in the present embodiment, the length of the heat transfer portion 12b of the bracket 12 is such that the holding portion 12a is in close contact (contact) with the heat sink 13 in a state where the holding portion 12a is in close contact with the upper core 14a via the heat dissipation sheet 25. Is set.

In the second embodiment, the bracket 12, the movable piece 27, and the compression coil spring 28 constitute a fixture for the transformer core 14.
Next, the operation of the fixture for the transformer core 14 in the second embodiment will be described.

  The compression coil spring 28 is configured such that the adjustment bolt B3 is brought into contact with the movable piece 27 in a state where one end of the compression coil spring 28 is fixed to the movable piece 27 and the other end is fixed to the pin 29 of the bracket 12. It is extended by screwing in. In FIG. 3, the adjustment bolt B3 shown on the left side is screwed into the screw hole 27b halfway, and the adjustment bolt B3 shown on the right side is screwed into the screw hole 27b until it comes into contact with the movable piece 27. The state where it was made to enter is shown. The bracket 12 is biased toward the heat sink 13 by the compression coil spring 28 being extended. That is, the bracket 12 is urged toward the heat sink 13 by the compression coil spring 28 through the through hole 17 in which the compression coil spring 28 is disposed.

  Here, the length of the heat transfer portion 12b of the bracket 12 is set to a length that is in close contact (contact) with the heat sink 13 in a state where the holding portion 12a is in close contact with the upper core 14a via the heat dissipation sheet 25. . For this reason, the transformer core 14 is sandwiched between the holding portion 12 a of the bracket 12 and the mounting surface 13 a of the heat sink 13 and is fixed to the heat sink 13.

  At this time, since the lower core 14b and the mounting surface 13a of the heat sink 13 are in close contact with each other, heat generated in the transformer 11 is easily transferred from the lower core 14b to the heat sink 13, and heat dissipation of the transformer core 14 is promoted. Is done.

  Further, the lower end portion (fixed portion 12 c) of the heat transfer portion 12 b of the bracket 12 is in close contact with the heat sink 13. Further, the holding portion 12 a of the bracket 12 and the upper core 14 a are brought into close contact with each other via the heat dissipation sheet 25 by the urging force of the compression coil spring 28. For this reason, the heat generated in the transformer 11 is easily transmitted from the upper core 14a to the holding portion 12a via the heat dissipation sheet 25. And the heat transmitted to the holding | maintenance part 12a is transmitted to the heat sink 13 via each heat-transfer part 12b. Therefore, heat dissipation of the transformer core 14 can be promoted.

Therefore, according to the second embodiment, in addition to the effects (1) and (2) of the first embodiment, the following effects can be obtained.
(5) The compression coil spring 28 is disposed inside the through hole 17 formed in the heat sink 13. For this reason, the compression coil spring 28 does not protrude from the heat sink 13, and the heat sink 13 can be prevented from increasing in size.

In addition, you may change the said embodiment as follows.
In each embodiment, an example in which water is used as the cooling medium (fluid) has been shown, but air or oil may be used instead of water.

In the first embodiment, the urging force of the leaf spring 19 may be transmitted by one connecting member 16 or may be transmitted by three or more connecting members 16.
In the first embodiment, each connecting member 16 may be provided with a fin for heat dissipation. In this case, one or two or more (plural) fins are formed along the circumferential direction of the connecting member 16. Further, the fins may be formed along the axial direction of the connecting member 16. By comprising in this way, the heat dissipation of the connection member 16 can further be improved.

  In the first embodiment, when air is used as the cooling medium, the O-ring 18 disposed on the connecting member 16 can be omitted. However, in order to prevent fluid (air) from leaking from the fluid path S, it is desirable to dispose the O-ring 18.

  In the first embodiment, when air is used as the cooling medium, each connecting member 16 can be configured not to slide through the through hole 17. That is, the diameter of each connecting member 16 may be set smaller than the inner diameter of the through hole 17 so that the connecting member 16 can simply move along the direction in which the center line of the through hole 17 extends. Even if comprised in this way, the urging | biasing force of the leaf | plate spring 19 can be transmitted to the bracket 12. FIG.

  In the second embodiment, as shown in FIG. 5, a portion of the heat sink 13 that is in close contact with the heat transfer portion 12b (fixed portion 12c) of the bracket 12 may be configured to be movable. More specifically, a guide hole 30 is provided in the heat sink 13 and a cylindrical cylindrical sliding member 31 capable of sliding through the guide hole 30 is provided. In this case, the compression coil spring 28 is disposed so as to be inserted through the cylindrical sliding member 31 (through hole 17). If comprised in this way, even if it does not arrange | position the thermal radiation sheet | seat 25 between the holding | maintenance part 12a of the bracket 12, and the upper core 14a, the mounting surface of the holding | maintenance part 12a of the bracket 12 and the heat sink 13 is mounted. The heat transfer part 12b (fixing part 12c) of the bracket 12 can be fixed in close contact with the cylindrical sliding member 31 while being in close contact with 13a. In this case, the cylindrical sliding member 31 may be biased toward the bracket 12 by a biasing means such as a spring. If comprised in this way, the heat-transfer part 12b of the bracket 12 and the cylindrical sliding member 31 can be stuck more reliably.

  (Circle) in each embodiment, you may form the upper surface of the upper core 14a in shapes other than a plane. That is, regardless of the shape of the upper surface of the upper core 14a, the holding portion 12a may be formed in a shape corresponding to the upper surface shape of the upper core 14a (a shape along the shape). Even if comprised in this way, the holding | maintenance part 12a of the bracket 12 and the upper core 14a can be stuck.

  In each embodiment, the bracket 12 may not be provided with the connection portion 12e. Even if comprised in this way, the heat-transfer part 12b can transmit heat to the heat sink 13 from the holding | maintenance part 12a.

In each embodiment, the fluid path S may not be provided inside the heat sink 13. Even if comprised in this way, the heat sink 13 can radiate heat.
Hereinafter, the technical idea that can be grasped from the above embodiment and other examples will be additionally described.

  (A) A fluid path through which a fluid passes is formed inside the heat radiating member, and the connecting member is exposed inside the fluid flow path. Transformer core fixture.

  (B) A movable piece movable along the inner wall surface of the through-hole, and being screwed into the movable piece, the movable piece is directed from the mounting surface side to the opposite surface side of the heat radiating member. The transformer core fixture according to claim 3, further comprising an adjustment bolt to be moved, wherein the compression coil spring is connected to the heat radiating member via the movable piece and the adjustment bolt.

The perspective view of the fixing tool in 1st Embodiment. AA sectional view taken on the line in FIG. Sectional drawing of the fixing tool in 2nd Embodiment. BB sectional drawing shown in FIG. Sectional drawing of the fixing tool in another example. Sectional drawing for demonstrating the bracket of a prior art.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Transformer, 12 ... Bracket, 13 ... Heat sink, 13a ... Mounting surface, 13b ... Opposite surface, 14 ... Transformer core, 16 ... Connecting member, 17 ... Through-hole, 19 ... Leaf spring, 28 ... Compression coil spring

Claims (3)

A transformer core fixture for fixing the transformer core between the bracket and the heat radiating member, which is connected to the heat radiating member by connecting the tip of a bracket surrounding the transformer core placed on the heat radiating member to the heat radiating member. There,
A through hole is formed in a connecting portion of the bracket in the heat radiating member, the bracket is urged toward the heat radiating member through the through hole, and the transformer core is adhered to the bracket Transformer core fixture.   A connecting member is slidably disposed in the through hole, and a plate spring for urging the bracket toward the heat radiating member is provided on a surface opposite to the mounting surface of the transformer core in the heat radiating member. The transformer core according to claim 1, wherein a base end is fixed, the bracket is fixed to one end of the connecting member, and a free end of the leaf spring is fixed to the other end of the connecting member. Fixing tool.   A compression coil spring for urging the bracket toward the heat radiating member is disposed in the through hole. One end of the compression coil spring is connected to the heat radiating member and the other end of the compression coil spring is The transformer core fixture according to claim 1, wherein the transformer core fixture is connected to a bracket.

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