JP6278250B2 - Reactor - Google Patents

Description

  The present invention relates to a reactor used in various power supply devices, and more particularly to a reactor used in a converter circuit of a high output electric motor such as a hybrid vehicle or an electric vehicle.

  High-power electric motors are installed in hybrid vehicles and electric vehicles that are rapidly spreading in recent years, and electronic components such as reactors that can withstand high voltages and large currents are used in the power converters used for this drive. ing. The electronic component basically includes an inductor component including a coil, an insulating resin bobbin around which the coil is wound, and a magnetic core disposed in the bobbin.

  Since the coil is energized with a battery voltage of 50 volts to several hundred volts, it is necessary to prevent destruction of the electronic component itself, electric leakage, or electric shock. Therefore, the inductor component is accommodated in a metal or resin case, and is fixed and protected by a potting resin (mold resin) in the case to enhance insulation. Further, it is fixed to a metal base, a heat sink, a frame, a substrate, etc. (hereinafter collectively referred to as “attachment”) that functions as a cooler by fixing means such as bolts.

  In addition, although the coil generates significant heat due to resistance loss, normally, heat generated from the inductor component is transferred to the mounted body through a mold resin, a case, and the like. However, with such a configuration, there is a natural limit to enhancing the cooling effect. In order to solve such a problem, Patent Document 1 or Patent Document 2 proposes that the coolant is brought into contact with the inductor component to absorb heat and cool the reactor.

  Patent Documents 1 and 2 disclose that a reactor is provided in a drive device of a hybrid vehicle. The drive device is responsive to the rotation of the first motor generator and the second motor generator (rotary electric machine), the reduction gear connected to the rotation shaft of the second motor generator, the power split mechanism, and the rotation shaft decelerated by the reduction gear. And a rotating axle. Various gears, rotating shafts, and bearings are provided in the drive device, and the lubricating oil that lubricates them is brought into direct contact with the reactor to absorb and cool the heat. Since the circulating lubricating oil wets the reactor so that the lubricating oil flowing in the drive device lubricates each part when the vehicle travels, the cooling effect can be further enhanced.

JP 2008-218732 A JP 2012-9565 A

  FIG. 16 shows the reactor disclosed in Patent Document 1. An inductor component L1 having a coil wound around a core is molded with a mold resin 301 so that one surface thereof is exposed. As the core, for example, a laminate of electromagnetic steel sheets is used. The mold resin 301 constitutes a substantially cylindrical tubular portion 310 and a flange portion 320 provided at the end of the tubular portion 310, and the tubular portion 310 is formed so as to surround the outer periphery of the inductor component L1. The In the illustrated embodiment, the inductor component L1 is embedded in the mold resin 301, but is molded so that one surface thereof is exposed. The flange portion 320 is provided with a through hole 321, and a bolt is passed therethrough to fix the reactor 300 to the mounted body. As the mold resin, a resin excellent in oil resistance and heat resistance is used, and PPS (Polyphenylene Sulfide) resin, PBT (Polybutylene terephthalate) resin, polyamide, nylon and the like are used.

  FIG. 17 shows a reactor disclosed in Patent Document 2. In the reactor 400, an inductor component L in which a first core 471 and a second core 472 are opposed to each other via a gap forming plate 482, fixed by an adhesive, and further provided with coils 474 and 475 on magnetic legs. including. The substantially entire surface of the first core 471 is covered with the resin mold portion 484, and the second core 472 and the coils 474 and 475 are formed so as to be in contact with the coolant (lubricating oil). The resin mold part 484 is provided with a through hole 487 so that the resin mold part 484 can be bolted to the mounted body.

  In these reactors 300 and 400, since the portion exposed from the mold resin becomes a region that is directly cooled by the cooling liquid, the larger the number of exposed portions, the better. However, in the configuration of the reactor of FIG. 16, the portion exposed from the mold resin by the mold resin 301 holding the inductor component L1 is only a part of the core and a part of the coil, and is limited.

  In the structure of the reactor of FIG. 17, compared with the reactor of FIG. 16, the coil part and core part exposed from mold resin are large. However, the second core 472 is only bonded and fixed to the first core 471, and no other fixing means is mentioned.

  Moreover, fixation with a to-be-mounted body and a reactor is performed by the resin mold part. Even if a resin excellent in oil resistance and heat resistance is used for the resin mold, the reactor may drop off from the mounted body as soon as cracking or the like occurs due to deterioration and the strength decreases. For this reason, there is a need for a reactor that can be efficiently brought into contact with an on-vehicle reactor that is directly cooled with a coolant such as lubricating oil and that can efficiently contact the coolant. .

  The present invention has been made to solve the above-described problems, and an object thereof is to provide an reactor capable of cooling a reactor with a coolant.

The present invention possess a ring-shaped magnetic core portion, and a resin case unit to lay supporting the coil accommodates said magnetic annular core portion and a coil portion formed of a coil wound on the resin case unit, the mounted A reactor fixed to a body , wherein the annular magnetic core portion includes a pair of prismatic first magnetic cores having a step at an end, and a plurality of columnar shapes bonded to the first magnetic core, or The resin case portion includes two cylindrical leg portions that accommodate the second magnetic core, and a partition wall that connects the cylindrical leg portions, and the partition wall includes the second magnetic core having a prismatic shape. A first partition wall connected to an end of the cylindrical leg portion; a second partition wall and a third partition wall extending to the opposite side of the cylindrical leg portion via the first partition wall; An area defined by the wall, the second partition wall, and the third partition wall is a space in which the first magnetic core is disposed. The coil portion is composed of two coils wound around the cylindrical leg portion of the resin case portion, and the coil and the first magnetic core are partitioned by a first partition wall, and the mounted body The first magnetic core is partitioned by a second partition wall, the end of the coil and the first magnetic core are partitioned by a third partition wall, and a third partition of the resin case portion A first fixing part having a through hole is provided in a stepped part at both ends of the first magnetic core exposed from the wall, and a through hole or a notch is formed in the second partition wall of the resin case part. A second fixing portion is provided, and the annular magnetic core portion and the resin case portion are integrally formed by a fixing member that is passed through a continuous through-hole portion where the first fixing portion and the second fixing portion overlap each other. is fixed to the mounting member, a first magnetic core of the annular magnetic core portion and the coil portion is cold A reactor, characterized in that the exposed so as to be in contact with the liquid.

In the present invention, it is preferable to have a first protrusion for positioning the coil on the cylindrical leg side of the first partition wall.

In the present invention, the third partition wall is provided with a second projection portion for positioning the end portion of each coil, and the second projection portion is arranged side by side with substantially the same width as the thickness of the rectangular wire forming the coil. It is preferable that the projection is constituted by a protrusion.

The reactor of the present invention can efficiently cool the reactor with a cooling liquid, and can be configured without a resin sealing with a simple structure and can be reduced in cost. In addition, the reactor can be reliably fixed to the mounted body, and even if it is used in an in-vehicle power conversion device that is repeatedly subjected to mechanical vibration, it is highly reliable without easily falling off. .
Therefore, since it has excellent heat dissipation and fixing properties, it is suitable for use in high-voltage and large-current power supply circuits, particularly in vehicles such as hybrid vehicles and electric vehicles.

It is a perspective view which shows the external appearance of one embodiment of the reactor of this invention. It is an upper surface side top view which shows the external appearance of one embodiment of the reactor of this invention. It is a top view by the side of the short side which shows the external appearance of one embodiment of the reactor of this invention. It is a top view by the side of the longitudinal side which shows the external appearance of one embodiment of the reactor of this invention. It is a top view by the side of the bottom face (mounting surface) which shows the appearance of one embodiment of the reactor of the present invention. It is a perspective view which shows the external appearance of the resin case used for the reactor of this invention. It is the top view seen from the cylindrical leg part side which shows the external appearance of the resin case used for the reactor of this invention. It is the top view seen from the partition wall side which shows the external appearance of the resin case used for the reactor of this invention. It is the top view seen from the side surface which shows the external appearance of the resin case used for the reactor of this invention. It is a perspective view which shows the external appearance of one embodiment of the coil part used for the reactor of this invention. It is a fragmentary sectional view for demonstrating the cross-sectional shape of the coil part used for the reactor of this invention. It is a perspective view which shows the external appearance of the cyclic | annular magnetic core part used for the reactor of this invention. It is a perspective view which shows the external appearance of the 1st magnetic core of the cyclic | annular magnetic core part used for the reactor of this invention. It is a disassembled perspective view for demonstrating the structure of the reactor of this invention. It is sectional drawing for demonstrating attachment to the to-be-mounted body of the reactor of this invention. (A) It is a front view for demonstrating the structure of the conventional reactor, (b) It is a top view on the upper surface side. It is sectional drawing for demonstrating the structure of the other conventional reactor.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited thereto, and additions and modifications can be made within the scope of the technical idea of the present invention. . The description of each embodiment is also applied to other embodiments unless otherwise specified. In any embodiment, the same reference numerals are assigned to the same components. In addition, since the upper and lower in the following description means the upper and lower in the drawing and are relative, for example, even if “upper” is referred to as “lower”, the structure is not different.

  FIG. 1 is a perspective view of a reactor according to the present invention. FIG. 2 is a plan view of the upper surface side of the reactor of FIG. 3 is a plan view of the first side surface of the reactor of FIG. 1 as viewed from the direction a, and FIG. 4 is a plan view of the second side surface of the reactor of FIG. 1 as viewed from the direction b. FIG. 5 is a plan view of the lower surface side of the reactor of FIG.

  The reactor 1 of the present invention basically has an annular magnetic core portion, a resin case portion that accommodates the magnetic annular core portion, and a conductive wire such as a rectangular copper wire wound around the resin case portion in a cylindrical shape. A coil portion including a coil. The pair of coils 31 and 32 of the coil part that generates heat when energized is provided on the outer surface of the resin case part, and most of the coil 31 and 32 is exposed on the surface of the reactor so that it can be directly cooled by the coolant. The resin case portion is configured by combining a pair of resin cases 20, the annular magnetic core portion is a second magnetic core housed inside the resin case portion, and a pair of first portions partially exposed from the resin case 20. The magnetic core 10 is provided, and the portion of the annular magnetic core portion that appears on the surface of the reactor and the coil portion that is exposed from the resin case portion are directly cooled by the coolant, thereby enhancing the cooling effect of the reactor. .

  The annular magnetic core part is provided with a first fixing part 16, and the resin case part is provided with a second fixing part 15 at a position overlapping the first fixing part 16. In the illustrated embodiment, each of the first fixing portion 16 and the second fixing portion 15 is formed as a through hole, and a fastening member is passed through a continuous through hole portion that is formed by overlapping each fixing portion, and the lower surface side of the reactor is used as a fixing surface. It can be fastened and fixed to the mounting body. In addition, although mentioned later, the 2nd fixing | fixed part 15 may not be provided in a resin case part. In this case, the fastening member is fastened and fixed to the mounted body through the fastening member to the first fixing portion 16 of the annular magnetic core portion. Further, each component will be described in detail with reference to the drawings.

(Resin case)
FIG. 6 shows an external perspective view of a resin case constituting the resin case portion. FIG. 7 shows a plan view (front view) seen from the cylindrical leg portion side of the resin case of FIG. 6, and FIG. 8 shows a plan view (rear view) seen from the opposite side of the cylindrical leg portion of the resin case of FIG. Indicates. FIG. 9 shows a side view of the resin case of FIG. The resin case portion has a size configuration such that the coil portion exposed on the surface of the reactor does not interfere with the mounted body.

  The resin case 2 includes two cylindrical leg portions 26 formed in a hollow shape and a partition wall connecting the cylindrical leg portions 26 so as to accommodate a second magnetic core that forms a part of the annular magnetic core portion. . The resin case portion is configured by combining the end portions of the cylindrical leg portion 26 so as to face each other. The end portion of one cylindrical leg of the resin case 2 is provided with a concave portion 27 over the entire inner circumference, and the end of the other cylindrical leg over the entire outer periphery. A concave portion 28 is provided. When the resin case 2 is made to face, the inner peripheral concave portion 27 and the outer peripheral concave portion 28 are combined at the end of the cylindrical leg portion 26. The thickness of the combined portion is formed so as to be substantially the same as the thickness of each wall portion of the cylindrical leg portion that does not have a depression, and a step is generated on the inner peripheral side and the outer peripheral side of the cylindrical leg portion 26. Absent. The hollow legs 29 are connected by the cylindrical leg portions 26 of the combined resin case 2 to form two continuous hollow portions.

  The partition wall 20 of the resin case 2 includes a first partition wall 20b connected to one end side of the cylindrical leg portion 26 and a second partition wall connected to the first partition wall 20b and extending to the opposite side of the cylindrical leg portion 26. 20a and a third partition wall 20c. In the drawing, a region surrounded by a second partition wall 20a located below the first partition wall 20b and a third partition wall 20c located above the first partition wall 20b overlapping the second partition wall 20a. 38 is partitioned and the first magnetic core 10 constituting the magnetic annular core portion is disposed. The first partition wall 20b partitions between the coils 31 and 32 and the first magnetic core, and the third partition wall partitions between the end portions 31a and 32a of the coil portion and the first magnetic core 10. , Ensure mutual insulation and creepage distance. At least one of the partition walls 20a, 20b, and 20c may be provided with a protrusion such as a claw or a hook that restricts the movement of the first magnetic core 10.

  A hollow portion 29 of the cylindrical leg portion 26 appears on the first partition wall 20b, and first projection portions 22, 23, 24, and 25 for positioning the coils 31 and 32 are provided on the cylindrical leg portion 26 side. . The first protrusions 22, 23, 24, and 25 are formed thicker than the first partition wall 20b, and complement the strength of the first partition wall 20b. Moreover, although the inner peripheral diameter of the coils 31 and 32 and the outer peripheral diameter of the cylindrical leg portion 26 are formed with a slight gap, the movement is restricted by the first projecting portions 22, 23, 24, and 25. The coils 31, 32, or the coils 31, 32 and the mounted body are prevented from interfering with each other due to mechanical vibration or the like. The first protrusions 22, 23, 24, and 25 are provided at the four corners and the center of the first partition wall 20b, the same protrusion 23 provided at the upper corner, and the lower corner. The projection portion 24 has the same shape, the projection portion 22 provided in the upper central portion, and the projection portion 25 provided in the lower central portion. Each protrusion is formed in a curved surface following the outer peripheral shape of the coils 31 and 32, and is positioned by contacting the outer peripheral surface of the coil to restrict radial movement. In addition, the said shape is one preferable aspect, Comprising: Another shape may be sufficient and it does not limit a shape. Furthermore, by applying an epoxy adhesive or the like between the protrusion and the coil, the coil can be easily and more firmly fixed.

  The second partition wall 20a partitions between the first magnetic core 10 and the mounted body (not shown), and a second fixing portion 15 configured by an oval through hole for fixing to the mounted body is provided. There are two places. The 2nd fixing | fixed part 15 may be a notch opened to the side instead of a through-hole. Further, it may be a circle having a diameter slightly larger than the diameter of the fixing bolt to be used. The second partition wall 20a is formed with a predetermined thickness so that there is no problem of deformation or breakage due to thermal expansion or the like when being fixed to the mounted body. In the illustrated embodiment, the second partition wall 20a is formed so as to cover substantially the entire surface of the first magnetic core 10, but the first magnetic core 10 is further reduced by reducing the formation region within a range where a predetermined strength can be obtained. It is desirable to expose. For example, a part between the pair of second fixing parts 15 may be removed, or a region where the second fixing parts 15 are provided may be excluded. When the region of the second fixing portion 15 is excluded, it is preferable that the surface of the mounted body has a projecting shape following that.

  Ends 31a, 31b, 32a, 32b of the coils 31, 32 are arranged above the third partition wall 20c, and the third partition wall 20c is also the first magnetic core, like the second partition wall 20a. It is formed so as to cover substantially the entire other surface of the ten. In the illustrated embodiment, the third partition wall 20c is configured to be thinner than the second partition wall 20a. However, the thickness may be increased. If the predetermined strength is obtained, the first magnetic core is secured in the same manner as the second partition wall 20a while ensuring the creepage distance between the end portions 31a, 32a of the coils 31, 32 and the first magnetic powder 10. It is desirable to further expose 10. In the embodiment shown in FIG. 4 and the like, the edge of the third partition wall 20c is made to coincide with the end of the first magnetic core 10, but it is configured to protrude from the end so as to secure a creepage distance. You may do it. A second protrusion 60 is provided on the upper side of the third partition wall 20c, and end portions 31a and 32a of the coils 31 and 32 extending to the end side (left side in FIG. 4) of the first magnetic core 10 are provided. Position it.

  The resin case 2 is an insulating resin material that has heat resistance and moderate deformability and can be easily molded. In addition to the above-described polyphenylene sulfide (PPS) resin, polybutylene terephthalate resin (PBT), polyamide, nylon, and the like. In addition, it can be formed by a known molding method such as injection molding using engineering plastics such as liquid crystal polymer (LCP), polybutylene terephthalate resin (PBT), and polyethylene terephthalate resin (PET).

(Coil part)
A coil part is comprised by the two coils 31 and 32 which wound the conducting wire in the cylinder shape. As the conductive wire, a coated wire having an insulating coating on a conductor made of a conductive material such as copper, aluminum, or an alloy thereof is used. In general, an enameled wire insulatively coated with polyamideimide on a copper wire is used. The number of turns of each coil is set as appropriate based on the inductance required for the reactor, the wire diameter is also appropriately selected according to the energized current, and is preferably an edgewise coil using a flat wire as the conducting wire. In the embodiment of the reactor shown in FIG. 1, the winding ends of the two coils 31 and 32 are bent in the coil winding axis direction, and the one end portions 31 b and 32 b are formed into an annular crimp sleeve 50. The coil part 3 is formed by being clamped and connected. The connection may be performed by welding or the like. FIG. 10 is an external perspective view showing another aspect of the coil portion, and the two coils 31 and 32 can be constituted by a single conducting wire. In this case, the crimp sleeve 50 may not be used in the portion 34 connecting the two coils 31 and 32.

  Each coil 31 and 32 is arranged in a state where it passes through two cylindrical leg portions 26 of the resin case portion. The winding directions of the coils 31 and 32 are arranged in parallel so that the directions of magnetic flux generated during energization are opposite to each other. The shape of the coils 31, 32 wound with a flat wire is preferably rectangular or circular. When the winding shape of the coils 31 and 32 is a rectangle, a predetermined amount of radius is formed at the inner and outer corners. FIG. 11 is an enlarged cross-sectional view of the rounded portion of the coil. When the edgewise coil is formed, the outer peripheral side is stretched and the thickness is reduced. The interval between the adjacent conductors is wider on the outer periphery side t out than the inner periphery interval t in, and a space is formed between the adjacent conductors so that the outer periphery side of the coil is relatively wider than the inner periphery side. . According to such a configuration, the cooling liquid that wets the reactor 1 flows through the space, and the coil can be cooled not only between its outer surface but also between the conductors, so that the cooling efficiency can be improved. Furthermore, if the winding shape is circular, a round is formed on the entire coil, so that the cooling efficiency can be further improved.

  The other end portions 31 a and 32 a of the coils 31 and 32 are positioned by the two second protrusions 60 on the third partition wall 20 c of the resin case 2 on one side. The 2nd projection part 60 is comprised by the processus | protrusion arrange | positioned along with the width | variety substantially the same as the thickness of conducting wire. The movement of the end portions 31a and 32a of the coils 31 and 32 is restricted by the second protrusion 60, the accuracy of the positions of both ends of the coil is increased with a simple configuration, and the distance between both ends of the coil is kept within a predetermined value. Even when a high voltage is applied between both ends, an insulation distance (creeping distance) for obtaining a desired insulation resistance can be secured. Furthermore, at least one of the I-shaped protrusions may be formed in an L shape so that the end portions 31a and 32a of the coils 31 and 32 can be locked in the second protrusion 60. In addition, the 2nd projection part 60 is suitably provided as needed, and does not need to be.

(Annular magnetic core)
FIG. 12 is an external perspective view of the annular magnetic core portion, and FIG. 13 is a perspective view of the external appearance of the first magnetic core constituting the annular magnetic core portion. Since most of the annular magnetic core portion 4 is covered with the resin case portion and the coil portion 3, they are omitted in FIG.

The annular magnetic core portion 4 is positioned on both ends in the winding axis direction of the coils 31 and 32 of the coil portion 3 and is surrounded by the first partition wall 20b, the second partition wall 20a, and the third partition wall 20c of the resin case 20. A pair of first magnetic cores disposed in the region 38 and a plurality of second magnetic cores that are housed in the hollow portion 29 of the cylindrical leg portion 26 of the resin case 2 and connect the pair of first magnetic cores 10 55, a magnetic gap G is provided between the adjacent second magnetic cores 55, and between the first magnetic core 10 and the second magnetic core 55, and ceramics such as Al ₂ O ₃ or heat resistant are provided in the magnetic gap G portion. The annular magnetic core portion 4 is configured by adhering at least the first magnetic core 10 and the second magnetic core 55 with an adhesive with a spacer made of a conductive resin interposed therebetween. Preferably, it is preferable to bond the adjacent second magnetic cores 55 with an adhesive because the strength against the external force of the reactor is increased.

  The outer shape of the first magnetic core 10 has a substantially prismatic shape, and stepped portions 12 are provided at both ends in the longitudinal direction, and through holes that are first fixing portions 16 are formed therein. The stepped portion 12 is provided at a portion deviated from an annular magnetic path constituted by the first magnetic core 10 and the second magnetic core 55. Since a fixing means such as a bolt is passed through the through-hole, the stepped portion 12 has sufficient strength against the stress applied during fixing, and the stepped portion 12 is configured to have a small reactor. Is preferably formed in such a size that the head of a bolt or the like can be kept lower than the resin case. The end surface 11 of the first magnetic core 10 that contacts the end surface of the second magnetic core 55 via a spacer is preferably formed in a flat shape in which the size of the magnetic gap G is difficult to vary.

  In the illustrated embodiment, the outer shape of the second magnetic core 55 is formed in a columnar shape in accordance with the cross-sectional shape of the hollow portion 29 of the cylindrical leg portion 26 of the resin case 2. Although it is easy to produce the second magnetic core 55 in a cylindrical shape, it is preferable, but depending on the shape of the hollow portion 29, a prismatic shape or other shapes may be used.

  Each magnetic core includes, for example, pure Fe, electromagnetic steel sheet, Fe—B—Si—C alloy, Fe—B—Si—Cu—Nb alloy, Fe, Fe—Si, Fe—Ni, Fe—Al, Fe -A powder made of a soft magnetic material such as an Fe-based alloy such as a Co, Fe-Cr, Fe-Si-M (M is Cr or Al) alloy and a binder such as an acrylic resin are mixed and pressed. It is possible to use a powder magnetic core obtained by appropriately annealing or a ferrite magnetic core. Further, each magnetic core may be configured using different magnetic materials, such as a first magnetic core as a ferrite core and a second magnetic core as a dust core.

(Reactor)
Next, the reactor of the present invention will be described. FIG. 14 is an exploded perspective view for explaining the assembly of the reactor, and FIG. 15 is a view for explaining the attachment of the reactor to the mounted body. In FIG. 14, the gap between the magnetic cores is not shown, but is arranged at the position shown in FIG. 12.

  The reactor 1 includes an annular magnetic core portion 4, a resin case 2 that accommodates the magnetic annular core portion 4, and a coil portion 3 that includes coils 31 and 32 in which rectangular wires are wound around the resin case in a cylindrical shape. . The two cylindrical legs 26 of one resin case 2 are passed through the hollow portions of the coils 31 and 32 from the ends 31b and 32b of the coils 31 and 32. Thereafter, the second partition wall 20a of the other resin case 2 is made to be flush with the second partition wall 20a of the one resin case 2, and the cylindrical leg portion 26 is connected to the end portions 31a and 32a of the coils 31 and 32. Are passed through the hollow portions of the coils 31 and 32, and the opposing cylindrical leg portions 26 are combined and integrated. In the assembly of the resin case 2 and the coil portion 3, the region 38 surrounded by the first partition wall to the third partition wall of the resin case 2 is connected to both ends of the coil in the winding axis direction. Two continuous hollows are formed.

The first magnetic core 10 is arranged in the region 38 on one side, the gap G and the second magnetic core 55 are stacked in this order on the two continuous hollow portions viewed from the region 38 on the other side, and finally the gap G is stacked. The 1st magnetic core 10 is arrange | positioned and fixed to the area | region 38 of the other side, and it is set as a reactor. With such a configuration, the assembly of the reactor 1 is much easier than the conventional one requiring a resin mold. For the gap G, it is preferable to use ceramics such as Al ₂ O ₃ having excellent heat resistance and thermal conductivity.

  The first magnetic core 10 and the cap G constituting the annular magnetic core portion 4 and the second magnetic core 55 and the gap G are fixed with an adhesive. Further, the resin case 2 and the first magnetic core 10 may be bonded and fixed. The pair of resin cases 2 constituting the resin case portion are the same, but a resin case having a different shape such as eliminating the second protrusion 60 on one side may be used.

  When the resin case portion and the annular magnetic core portion 4 are combined, a first fixing portion 16 provided in the first magnetic core 10, a second fixing portion 15 provided in the resin case 2, and a continuous through hole portion appear. The fastening member 110 is then fastened and fixed to the mounted body 120 such as aluminum. Lubricating oil for lubricating the gears and the like is accumulated in the oil receiver in the drive device that is the mounted body 120, and the gears scoop up the lubricating oil when the vehicle travels, and a part of the lifted lubricating oil is the reactor 1. Wet the surface of reactor 1 by flowing to the side or splashing. Between the coils 31 and 32 arranged side by side, and between the coils 31 and 32 and the mounted body 120, spaces are formed so as to ensure the flow of the lubricating oil. And part of the first magnetic core 10 constituting the magnetic annular core portion 4 is exposed on the surface of the reactor 1 so as to be in direct contact with the lubricating oil, so that the lubricating oil can be efficiently cooled as a cooling liquid. . The lubricating oil that has wetted the reactor 1 returns to the oil receiver by its own weight.

DESCRIPTION OF SYMBOLS 1 Reactor 2 Resin case 3 Coil part 4 Annular magnetic core part 10 1st magnetic core 15 2nd fixing | fixed part 16 1st fixing | fixed part 55 2nd magnetic core

Claims (3)

A ring-shaped magnetic core portion, possess a resin case unit to lay supporting the coil accommodates said magnetic annular core portion and a coil portion formed of a coil wound on the resin case portion, is fixed to the mounting member A reactor,
The annular magnetic core portion has a pair of prismatic first magnetic cores having a step at an end, and a plurality of cylindrical or prismatic second magnetic cores that are bonded and fixed to the first magnetic core. ,
The resin case portion includes two cylindrical leg portions that house the second magnetic core and a partition wall that connects the cylindrical leg portions, and the partition wall is connected to an end portion of the cylindrical leg portion. A partition wall; and a second partition wall and a third partition wall that extend to the opposite side of the cylindrical leg portion via the first partition wall, the first partition wall, the second partition wall, and the third partition wall And the area partitioned by the first magnetic core is a space,
The coil part is composed of two coils wound around the cylindrical leg part of the resin case part,
The coil and the first magnetic core are partitioned by a first partition wall, the mounted body and the first magnetic core are partitioned by a second partition wall, and the end of the coil and the first magnetic core 1 magnetic core is partitioned by the third partition wall,
A first fixing portion having a through hole is provided in the stepped portions at both ends of the first magnetic core exposed from the third partition wall of the resin case portion,
A second fixing part in which a through hole or a notch is formed is provided in the second partition wall of the resin case part,
The annular magnetic core portion and the resin case portion are integrally fixed to the mounted body by a fixing member that is passed through a continuous through-hole portion where the first fixing portion and the second fixing portion overlap each other,
A reactor, wherein the first magnetic core of the annular magnetic core portion and the coil portion are exposed so as to be in contact with a coolant. The reactor according to claim 1,
A reactor having a first protrusion for positioning a coil on the cylindrical leg side of the first partition wall. The reactor according to claim 1 or 2,
A second protrusion for positioning the end of each coil on the third partition wall;
The reactor is characterized in that the second projecting portion is composed of a projection arranged side by side with substantially the same width as the thickness of the flat wire forming the coil .

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