WO2014162780A1 - Cooling structure - Google Patents

Cooling structure Download PDF

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Publication number
WO2014162780A1
WO2014162780A1 PCT/JP2014/053420 JP2014053420W WO2014162780A1 WO 2014162780 A1 WO2014162780 A1 WO 2014162780A1 JP 2014053420 W JP2014053420 W JP 2014053420W WO 2014162780 A1 WO2014162780 A1 WO 2014162780A1
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WO
WIPO (PCT)
Prior art keywords
cooling air
heat sink
converter
frame member
power converter
Prior art date
Application number
PCT/JP2014/053420
Other languages
French (fr)
Japanese (ja)
Inventor
武司 小田
Original Assignee
本田技研工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 本田技研工業株式会社 filed Critical 本田技研工業株式会社
Priority to CN201480010642.8A priority Critical patent/CN105027405B/en
Priority to JP2015509941A priority patent/JP6034957B2/en
Publication of WO2014162780A1 publication Critical patent/WO2014162780A1/en

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
    • H05K7/20909—Forced ventilation, e.g. on heat dissipaters coupled to components
    • H05K7/20918—Forced ventilation, e.g. on heat dissipaters coupled to components the components being isolated from air flow, e.g. hollow heat sinks, wind tunnels or funnels

Definitions

  • the present invention relates to a cooling structure that cools a power converter by heat exchange with cooling air.
  • Electrical components (air conditioners, lamps, audio equipment, etc.) installed in a hybrid vehicle are driven by DC power supplied from a battery, regenerative power supplied from a traveling motor, or the like.
  • the voltage is stepped up / down by the DC-DC converter and the DC / AC conversion by the inverter is performed.
  • Patent Document 1 discloses that each power conversion device (DC-DC converter and inverter) has a heat sink of a DC-DC converter and a heat sink of an inverter parallel to the flow direction of cooling air. It describes a cooling structure with both sides fixed by brackets. The cooling structure is configured to allow cooling air to flow through a flow path sandwiched between the power conversion devices in the height direction and sandwiched between the two brackets in the width direction.
  • an object of the present invention is to provide a cooling structure with improved cooling efficiency.
  • a cooling structure includes a first power conversion device having a first heat sink and a second power conversion device having a second heat sink.
  • a cooling structure that cools by replacement wherein a first hole into which the first heat sink is inserted and a second hole into which the second heat sink is inserted so as to face the first heat sink are formed
  • a cooling air duct that is a resin tubular body, and a pair of holding portions that hold the first power conversion device and the second power conversion device in a state of being separated from each other in the height direction, and the first power
  • the cooling air duct has a periphery of the first hole in close contact with the first power conversion device, and a periphery of the second hole.
  • the second power Characterized in that it is arranged so as to be in close contact with the converter.
  • the first power conversion device and the second power conversion device are held in a state of being separated in the height direction by the pair of holding portions, and are coupled to the frame member. Therefore, even when a resin cooling air duct is used, the coupling strength between the first power converter and the second power converter can be sufficiently secured by the frame member.
  • the cooling air duct which is a cylindrical body, is arranged so that the periphery of the first hole is in close contact with the first power converter and the periphery of the second hole is in close contact with the second power converter. Therefore, there is no gap between the first power converter or the second power converter and the cooling air duct, and the cooling air can be prevented from leaking outside.
  • the cooling air duct is made of resin, the cooling air duct is appropriately brought into close contact with the first power conversion device and the second power conversion device while absorbing a dimensional error generated when the cooling structure is manufactured. Can do. As a result, heat exchange between the first heat sink and the second heat sink and the cooling air disposed so as to face each other is performed with high efficiency, and the cooling efficiency of the first power converter and the second power converter is improved. Can do.
  • Each of the pair of holding portions includes a support portion extending in a height direction so as to separate the first power conversion device and the second power conversion device, and a width direction inner side from one end of the support portion. And a fastening part that is bolted to the second power converter between the support part and the cooling air duct in the width direction.
  • the fastening portion extends inward in the width direction from one end of the support portion.
  • the respective fastening portions extend so that their tips approach each other in the width direction. Therefore, it becomes easy to form a frame member with one sheet metal including each support part and each fastening part.
  • the fastening portion can be appropriately bolted (coupled) to the second power conversion device in the gap in the width direction formed between the cooling air duct that is a cylindrical body and the support portion extending in the height direction.
  • the bolt fastening described above means fastening using bolts and nuts corresponding to each other.
  • the frame member includes a connection portion that is integrally formed with each of the fastening portions so as to form an insertion hole into which the second heat sink is inserted.
  • the frame member is integrally formed with the pair of holding portions and the connecting portion. Therefore, for example, it is possible to form a frame member by bending or punching a single sheet metal, which saves the trouble of manufacturing the frame member and reduces the number of parts of the cooling structure. it can.
  • the insertion hole can be formed in an arbitrary shape (for example, a rectangular shape) corresponding to the second heat sink.
  • a cooling structure with improved cooling efficiency can be provided.
  • FIG. 2 is a cross-sectional view of the cooling structure shown in FIG.
  • FIG. 3 is an end view taken along the line BB of the cooling structure shown in FIG. 2.
  • It is the disassembled perspective view which looked at the cooling structure from the right rear. It is the elements on larger scale which looked at the location where the holding
  • the PDU 10 and the DC-DC converter 20 are included in a PCU (Power Control Unit) that controls charging / discharging of a battery (not shown) and power running / regenerative driving of a traveling motor (not shown). It is mounted under a rear seat (not shown).
  • PCU Power Control Unit
  • the PDU 10 (first power conversion device) shown in FIG. 1 is electrically connected to the battery and the travel motor, and functions as an inverter that converts DC power from the battery into predetermined AC power.
  • the PDU 10 (see FIG. 4) includes a main body 11 having an electronic circuit (heating element: not shown) such as a switching element and a resistor, and a heat sink 12 (first heat sink) disposed so as to be able to exchange heat with the main body 11. ) And a housing part 13 for housing the main body part 11.
  • a pair of flanges 11 a and 11 b for fastening the main body part 11 and the accommodating part 13 are formed on the left and right sides of the main body part 11.
  • the right flange 11a extends in the front-rear direction, and two insertion holes h1 through which the bolts b1 welded to the bottom wall 131 of the housing portion 13 are inserted are formed.
  • the heat sink 12 has a plurality of heat radiating fins arranged in parallel to each other, and is arranged so as to be able to exchange heat with the main body 11.
  • the radiating fin is a metal plate (for example, aluminum) that has a rectangular shape in a side view, and is disposed in parallel to each other with a predetermined interval from other radiating fins adjacent in the left-right direction.
  • the accommodating part 13 (refer FIG. 4) is a member which accommodates the main-body part 11 in the state which exposed the heat sink 12, and is formed in the concave shape (box shape with the upper part opened).
  • a rectangular hole H1 into which the heat sink 12 is inserted is formed in the bottom wall 131 of the accommodating portion 13.
  • the inner side surface of the accommodating part 13 has a predetermined margin in the front-rear and left-right directions with respect to the side surface of the main body part 11. Is formed.
  • each bolt b1 is inserted into the insertion hole h1 of the flange 11a, 11b.
  • four bolts b4 projecting downward are welded to the lower surface of the bottom wall 131 of the accommodating portion 13. These bolts b4 are welded in advance to fasten the PDU 10 to the cooling air duct 30 and the frame member 40.
  • a DC-DC converter 20 (second power converter) shown in FIG. 4 is a device that steps up and down a voltage in response to a control command from an ECU (Electric Control Unit: not shown), and includes a battery (not shown), It is electrically connected to various electrical components (not shown).
  • the DC-DC converter 20 includes a main body 21 having an electronic circuit (heating element: not shown) such as a switching element and a resistor, and a heat sink 22 (second heat sink: 4).
  • a flange 21 a for fastening the main body 21 to the frame member 40 is formed on the upper wall of the main body 21.
  • insertion holes h2 through which bolts b2 welded to the frame member 40 are inserted are formed at the front, rear, left and right corners, respectively, so as to protrude downward.
  • the heat sink 22 has a plurality of heat radiating fins arranged in parallel to each other, and is arranged so as to be able to exchange heat with the main body 21.
  • the radiating fin is a metal plate (for example, aluminum) that has a rectangular shape in a side view, and is disposed in parallel to each other with a predetermined interval from other radiating fins adjacent in the left-right direction.
  • the cooling structure A has a function of cooling the PDU 10 and the DC-DC converter 20 by heat exchange with cooling air.
  • the cooling structure A includes a cooling air duct 30 for passing cooling air and a frame member 40 that couples the PDU 10 and the DC-DC converter 20.
  • the cooling air duct 30 includes a duct body 31 for allowing the cooling air to flow, seal members 32p and 32q for closely attaching the cooling air duct 30 to the PDU 10 and the DC-DC converter 20, A pair of flanges 33a and 33b.
  • the duct main body 31 is a cylindrical body made of resin, and has a flow path through which cooling air flows.
  • the duct body 31 is formed with a first hole K1 into which the heat sink 12 of the PDU 10 is inserted, and a second hole K2 into which the heat sink 22 of the DC-DC converter 20 is inserted so as to face the heat sink 12. Yes.
  • the duct body 31 includes a side wall 34 (see FIG. 3) extending so as to sandwich the heat sinks 12 and 22 from the left and right directions, and a cylindrical introduction portion 35 extending from the side wall 34 toward the upstream side of the cooling air. (See FIG. 2) and a cylindrical lead-out portion 36 (see FIG. 2) extending from the side wall 34 toward the downstream side of the cooling air are integrally formed.
  • the introduction part 35 is formed so that the opening 35t faces downward
  • the lead-out part 36 is formed so that the opening 36t faces forward.
  • Seal members 32r and 32s are installed in the openings 35t and 36t, respectively, for preventing cooling air from leaking in a state where the openings are connected to other devices or pipes.
  • the first hole K ⁇ b> 1 is a rectangular hole, and is formed larger than the hole H ⁇ b> 1 of the housing portion 13 so that the heat sink 12 of the PDU 10 faces the cooling air duct 30.
  • the sealing member 32p is an annular elastic member (for example, made of resin) whose inner edge and outer edge are substantially rectangular in plan view.
  • the seal member 32p is bonded to the upper surface of the duct body 31 so as to surround the rectangular edge of the first hole K1.
  • the second hole K2 is a rectangular hole, and has substantially the same size as an insertion hole H4 of the frame member 40 (or later) so that the heat sink 22 of the DC-DC converter 20 faces the cooling air duct 30 (or Larger than the insertion hole H4).
  • the seal member 32q is an annular elastic member (for example, made of resin) whose inner edge and outer edge are substantially rectangular in plan view. The seal member 32q is bonded to the lower surface of the duct body 31 so as to surround the rectangular edge of the second hole K2.
  • the pair of flanges 33a and 33b are respectively installed on the side walls 34 of the duct body 31 (see FIGS. 2 and 3).
  • the right flange 33a extends in the front-rear direction, and two insertion holes h3 are formed through which bolts b4 protruding from the lower surface of the housing portion 13 are inserted. The same applies to the left flange 33b.
  • the frame member 40 shown in FIG. 4 is a plate-like member coupled to the PDU 10 and the DC-DC converter 20, and is formed, for example, by bending or punching one sheet metal. Thereby, the coupling strength of the PDU 10, the cooling air duct 30, the frame member 40, and the DC-DC converter 20 can be sufficiently secured.
  • the frame member 40 includes a pair of holding portions 42a and 42b that hold the PDU 10 and the DC-DC converter 20 in a state of being separated from each other in the height direction, and a pair of connecting portions 41 that connect the holding portions 42a and 42b. have.
  • the holding part 42a includes a support part 421a, a flange 422a extending from the upper end of the support part 421a to the right side, and a fastening part 423a extending from the lower end of the support part 421a to the left side.
  • the support portion 421a extends along the flow direction (front-rear direction) of the cooling air, and extends in the height direction so as to separate the PDU 10 and the DC-DC converter 20.
  • the flange 422a is a portion coupled to the PDU 10 together with the flange 33a of the cooling air duct 30, and extends from the upper end of the support portion 421a to the right side (width direction outer side).
  • Two insertion holes h4 for inserting bolts b4 protruding from the lower surface of the accommodating portion 13 are formed in the flange 422a.
  • the fastening portion 423a is a portion coupled to the flange 21a of the DC-DC converter 20, and extends from the lower end of the support portion 421a to the left (in the width direction). Two bolts b2 inserted into the insertion hole h2 of the flange 21a are welded to the fastening portion 423a so as to protrude downward.
  • the fastening portion 423a is DC-DC between the side wall 34 (see FIG. 3) of the cooling air duct 30 and the support portion 421a in the width direction in a state where the DC-DC converter 20 and the cooling air duct 30 are assembled to itself.
  • a bolt is fastened to the converter 20.
  • the above-described “bolt fastening” means fastening using the bolt b2 and the nut m2 corresponding to each other.
  • the holding part 42b has a support part 421b, a flange 422b extending from the upper end of the support part 421b to the left side, and a fastening part 423b extending from the lower end of the support part 421b to the right side. Since the holding part 42b has the same configuration as the holding part 42a described above, the description thereof is omitted.
  • the pair of connecting portions 41 extend in the left-right direction so as to connect the right fastening portion 423a and the left fastening portion 423b. That is, each connecting portion 41 is integrally formed with the pair of fastening portions 423a and 423b so as to form a rectangular insertion hole H4 into which the heat sink 22 is inserted.
  • the insertion hole H4 is formed in a size that allows the heat sink 22 of the DC-DC converter 20 to be inserted. Therefore, it is possible to form the frame member 40 by bending or punching a single sheet metal, saving time and trouble of manufacturing the frame member 40 and minimizing the number of parts of the cooling structure A. Can be suppressed.
  • the bolt b2 welded to the fastening portions 423a and 423b of the frame member 40 so as to protrude downward is inserted into the insertion hole h2 of the DC-DC converter 20, and the fastening portions 423a and 423b and the connecting portion 41 are inserted.
  • the lower surface is closely attached to the upper surface of the flange 21a (see FIG. 3).
  • the heat sink 22 is exposed through the insertion hole H4 of the frame member 40.
  • the PDU 10, the cooling air duct 30, the frame member 40, and the DC-DC converter 20 are sequentially arranged in the vertical direction and assembled to each other. That is, the four bolts b4 welded to the bottom wall 131 of the housing portion 13 are inserted into the insertion holes h3 of the flanges 33a and 33b and the insertion holes h4 of the flanges 422a and 422b. Then, the heat sink 12 of the PDU 10 is exposed to the cooling air flow path through the first hole K1, and the heat sink 22 of the DC-DC converter 20 is exposed to the cooling air flow path through the insertion hole H4 and the second hole K2. To do. In this state, the heat sinks 12 and 22 have their heat radiating fins extending in the same direction (front-rear direction) and facing each other in the vertical direction. Therefore, it is possible to minimize the fluid resistance when the cooling air flows.
  • the PDU 10, the cooling air duct 30, the frame member 40, and the DC-DC converter 20 are coupled (fastened) using nuts m2 and m4. That is, as shown in FIGS. 4 and 5 (a), the bolt b4 welded to the housing portion 13 is inserted into the insertion hole h3 of the right flange 33a and the insertion hole h4 of the flange 422a, and the nut m4 from below. Conclude with. Further, as shown in FIGS. 4 and 5B, the bolt b4 welded to the accommodating portion 13 is inserted into the insertion hole h3 of the left flange 33b and the insertion hole h4 of the flange 422b, and the nut m4 from below. Conclude with.
  • the bolt b2 welded to the fastening portions 423a and 423b is inserted into the insertion hole h2 of the flange 21a of the DC-DC converter 20, and fastened with a nut m2 from below.
  • the insertion position of the bolt b4 that fastens the PDU 10 and the frame member 40 (tool line: ⁇ ), and the insertion position of the bolt b2 that fastens the DC-DC converter 20 and the frame member 40. (Tool line: ⁇ mark) does not overlap in the assembly direction (vertical direction).
  • the bolts b2 and b4 ( ⁇ and ⁇ ) are exposed. Therefore, the nuts m2 and m4 may be fastened together for each of the eight bolts b2 and b4 in total, and the assembling work can be simplified and speeded up as compared with the case where the fastening work is performed in a plurality of stages. .
  • the bolt b ⁇ b> 2 is welded to the fastening portions 423 a and 423 b of the frame member 40, and the bolt b ⁇ b> 4 is welded to the bottom wall 131 of the housing portion 13. Therefore, it is only necessary to tighten the nuts m2 and m4 from below, and the fastening operation can be simplified.
  • the side wall 34 (see FIG. 3) of the cooling air duct 30 that sandwiches the heat sinks 12 and 22 in the left-right direction, the lower surface of the PDU 10 (including the surface of the heat sink 12), and the DC-DC converter 20
  • a flow path through which cooling air flows is formed by the upper surface (including the heat sink 22).
  • the cylindrical introduction portion 35 extends from the side wall 34 of the cooling air duct 30 to the upstream side, and the cylindrical lead-out portion 36 extends to the downstream side.
  • the sealing members 32p and 32q having elasticity are compressed in the vertical direction by the fastening operation described above.
  • the seal member 32p is in close contact with the lower surface of the housing portion 13 of the PDU 10
  • the seal member 32q is in close contact with the upper surface of the coupling portion 41 and the fastening portions 423a and 423b of the frame member 40. Therefore, there is no gap between the cooling air duct 30 and the PDU 10 and between the cooling air duct 30 and the DC-DC converter 20, and it is possible to reliably prevent the cooling air from leaking outside.
  • the cooling air sent through the opening 35t flows through the cylindrical introduction portion 35, and the side wall 34 of the cooling air duct 30 (see FIG. 3), the PDU 10, and the DC ⁇ It flows into the flow path formed by the DC converter 20.
  • the cooling air absorbs heat from the heat sinks 12 and 22.
  • the PDU 10 is cooled by dissipating heat to the cooling air via the heat sink 12
  • the DC-DC converter 20 is cooled by dissipating heat to the cooling air via the heat sink 22.
  • the cooling air duct 30 is made of resin, a dimensional error at the time of manufacture can be absorbed by its own deformation. Further, the cooling air duct 30 is in close contact with the PDU 10 and the DC-DC converter 20 by elastic seal members 32p and 32q. Therefore, it is possible to reliably prevent the cooling air from leaking to the outside.
  • the cooling air heated by the above-described heat absorption flows through the cylindrical outlet 36 and flows out through the opening 36t.
  • the seal member 32p installed so as to surround the first hole K1 is in close contact with the PDU 10
  • the seal member 32q installed so as to surround the second hole K2 is the frame member. 40. Accordingly, there is no gap between the PDU 10 and the cooling air duct 30 or between the cooling air duct 30 and the frame member 40, and it is possible to reliably prevent the cooling air from leaking to the outside. As a result, the PDU 10 and the DC-DC converter 20 can be cooled with high efficiency, and a cooling fan (not shown) for sending the cooling air can be downsized.
  • the PDU 10 and the DC-DC converter 20 are coupled by a frame member 40 having a pair of holding portions 42 a and 42 b and a connecting portion 41. Therefore, for example, even when the cooling air duct 30 is made of resin, the frame member 40 can sufficiently secure the coupling strength between the PDU 10 and the DC-DC converter 20. That is, according to the present embodiment, the cooling air duct 30 is responsible for forming the cooling air flow path, and the frame member 40 is responsible for ensuring the coupling strength, thereby ensuring sufficient coupling strength. Cooling efficiency can be improved.
  • the frame member 40 includes a fastening portion 423a extending to the left side (width direction inner side) from the support portion 421a and a fastening portion 423b extending to the right side (width direction inner side) from the support portion 421b via a pair of connecting portions 41. It has a connected structure. Therefore, the frame member 40 can be formed by bending or punching one sheet metal, and the number of parts required for the cooling structure A can be reduced. As a result, the labor for manufacturing the cooling structure 40 can be saved, and the manufacturing cost can be greatly reduced.
  • the insertion positions (tool lines) of the bolts b2 and b4 for performing each fastening do not overlap in the assembly direction. Therefore, the assembly work and the fastening work are collectively performed from one side in a state where the PDU 10, the cooling air duct 30, the frame member 40, and the DC-DC converter 20 are assembled, thereby reducing the man-hour when the cooling structure A is manufactured. it can.
  • the said embodiment demonstrated the case where the flanges 33a and 33b of the cooling wind duct 30 were interposed between PDU10 (accommodating part 13) and the holding
  • the first power conversion device is the PDU 10 (inverter) and the second power conversion device is the DC-DC converter 20 has been described.
  • the present invention is not limited to this.
  • the first and second power converters other power converters such as an AC / DC converter, a VCU (Voltage Control Unit), and the like may be used.
  • the PDU 10 has the accommodating part 13 and the bolts b1 and b4 are previously welded to the accommodating part 13 in the embodiment, the present invention is not limited to this.
  • the accommodating part 13 may be omitted, the length of the flanges 11a and 11b extending in the left-right direction may be made longer than that in the above embodiment, and the bolts b1 and b4 may be welded to the flanges 11a and 11b.
  • the said embodiment demonstrated the case where holding
  • the said embodiment demonstrated the case where the volt
  • the said embodiment demonstrated the case where the volt
  • the cooling structure A was mounted in a hybrid vehicle, it is not restricted to this.
  • the cooling structure A may be mounted on other types of vehicles such as electric vehicles and fuel cell vehicles. Further, the cooling structure A may be mounted on a moving body such as a motorcycle, a ship, or an aircraft, or may be mounted on a stationary system.
  • a Cooling structure 10 PDU (first power converter) 11 Body 12 Heat sink (first heat sink) 13 Housing 20 DC-DC converter (second power converter) 21 Main body 22 Heat sink (second heat sink) 30 Cooling air duct 31 Duct body 32p, 32q Seal member 40 Frame member 41 Connection portion 42a, 42b Holding portion 421a, 421b Support portion 422a, 422b Flange 423a, 423b Fastening portion K1 First hole K2 Second hole H4 Insertion hole

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Inverter Devices (AREA)
  • Dc-Dc Converters (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)

Abstract

Provided is a cooling structure having improved cooling efficiency. A cooling structure (A) comprises: a cylindrical cooling air duct (30) having formed therein a first hole (K1) in which a heat sink (12) is inserted, and a second hole (K2) in which a heat sink (22) is inserted; and a frame member (40) having a pair of holding sections (42a, 42b) which holds a PDU (10) and a DC-DC converter (20) in such a manner that the PDU (10) and the DC-DC converter (20) are arranged at a distance from each other in the height direction, the frame member (40) being joined to both the PDU (10) and the DC-DC converter (20). The cooling air duct (30) is disposed so that the periphery of the opening of the first hole (K1) is in close contact with the PDU (10) and so that the periphery of the opening of the second hole (K2) is in close contact with the DC-DC converter (20).

Description

冷却構造体Cooling structure
　本発明は、冷却風との熱交換によって電力変換装置を冷却する冷却構造体に関する。 The present invention relates to a cooling structure that cools a power converter by heat exchange with cooling air.
　ハイブリッド自動車に設置される電装部品（エアコン、ランプ、オーディオ機器等）は、バッテリから供給される直流電力や走行モータから供給される回生電力等によって駆動する。なお、前記した電力を供給する際、ＤＣ－ＤＣコンバータによる電圧の昇降圧や、インバータによる直流／交流変換が行われる。 Electrical components (air conditioners, lamps, audio equipment, etc.) installed in a hybrid vehicle are driven by DC power supplied from a battery, regenerative power supplied from a traveling motor, or the like. When supplying the electric power, the voltage is stepped up / down by the DC-DC converter and the DC / AC conversion by the inverter is performed.
　ところで、ＤＣ－ＤＣコンバータ、インバータ等の電力変換装置は、自身の駆動に伴って発熱する。したがって、電力変換装置にヒートシンクを設け、このヒートシンクを介して冷却風と熱交換することで電力変換装置を冷却する冷却構造体が知られている。 Incidentally, power converters such as DC-DC converters and inverters generate heat as they are driven. Therefore, a cooling structure that cools the power conversion device by providing a heat sink in the power conversion device and exchanging heat with the cooling air via the heat sink is known.
　例えば、特許文献１には、ＤＣ－ＤＣコンバータのヒートシンクと、インバータのヒートシンクと、が冷却風の通流方向に対して平行となるように、各電力変換装置（ＤＣ－ＤＣコンバータ及びインバータ）の両側をブラケットで固定した冷却構造体について記載されている。当該冷却構造体は、高さ方向において各電力変換装置で挟まれ、かつ、幅方向において２つのブラケットで挟まれる流路に冷却風を通流させる構成となっている。 For example, Patent Document 1 discloses that each power conversion device (DC-DC converter and inverter) has a heat sink of a DC-DC converter and a heat sink of an inverter parallel to the flow direction of cooling air. It describes a cooling structure with both sides fixed by brackets. The cooling structure is configured to allow cooling air to flow through a flow path sandwiched between the power conversion devices in the height direction and sandwiched between the two brackets in the width direction.
特開２００９－１８７８５号公報JP 2009-18785 A
　しかしながら、特許文献１に記載の発明では、各電力変換装置とブラケットとの間に隙間が生じ易く、この隙間を介して冷却風が外部に漏れてしまい、冷却効率が低下するおそれがある。 However, in the invention described in Patent Document 1, a gap is easily generated between each power conversion device and the bracket, and cooling air leaks to the outside through the gap, which may reduce the cooling efficiency.
　そこで本発明は、冷却効率を向上させた冷却構造体を提供することを課題とする。 Therefore, an object of the present invention is to provide a cooling structure with improved cooling efficiency.
　前記した課題を解決するための手段として、本発明に係る冷却構造体は、第１ヒートシンクを有する第１電力変換装置と、第２ヒートシンクを有する第２電力変換装置と、を冷却風との熱交換によって冷却する冷却構造体であって、前記第１ヒートシンクが挿入される第１孔と、前記第１ヒートシンクと対向するように前記第２ヒートシンクが挿入される第２孔と、が形成された樹脂製の筒状体である冷却風ダクトと、前記第１電力変換装置と前記第２電力変換装置とを高さ方向において離間した状態で保持する一対の保持部を有すると共に、前記第１電力変換装置及び前記第２電力変換装置に結合されるフレーム部材と、を備え、前記冷却風ダクトは、前記第１孔の周囲が前記第１電力変換装置に密着し、前記第２孔の周囲が前記第２電力変換装置に密着するように配置されることを特徴とする。 As a means for solving the above-described problems, a cooling structure according to the present invention includes a first power conversion device having a first heat sink and a second power conversion device having a second heat sink. A cooling structure that cools by replacement, wherein a first hole into which the first heat sink is inserted and a second hole into which the second heat sink is inserted so as to face the first heat sink are formed A cooling air duct that is a resin tubular body, and a pair of holding portions that hold the first power conversion device and the second power conversion device in a state of being separated from each other in the height direction, and the first power A frame member coupled to the conversion device and the second power conversion device, wherein the cooling air duct has a periphery of the first hole in close contact with the first power conversion device, and a periphery of the second hole. The second power Characterized in that it is arranged so as to be in close contact with the converter.
　このような構成によれば、第１電力変換装置と第２電力変換装置は、一対の保持部によって高さ方向において離間した状態で保持され、フレーム部材に結合される。したがって、樹脂製の冷却風ダクトを用いた場合でも、第１電力変換装置と第２電力変換装置との結合強度をフレーム部材によって充分に確保できる。 According to such a configuration, the first power conversion device and the second power conversion device are held in a state of being separated in the height direction by the pair of holding portions, and are coupled to the frame member. Therefore, even when a resin cooling air duct is used, the coupling strength between the first power converter and the second power converter can be sufficiently secured by the frame member.
　また、筒状体である冷却風ダクトは、第１孔の周囲が第１電力変換装置に密着し、第２孔の周囲が第２電力変換装置に密着するように配置される。したがって、第１電力変換装置又は第２電力変換装置と冷却風ダクトとの間に隙間が生じることはなく、冷却風が外部に漏れることを防止できる。さらに、冷却風ダクトが樹脂製であることから、冷却構造体の製造時に生じる寸法誤差を吸収しつつ、冷却風ダクトを第１電力変換装置及び第２電力変換装置に対して適切に密着させることができる。
　その結果、互いに対向するように配置される第１ヒートシンク及び第２ヒートシンクと冷却風との熱交換が高効率で行われ、第１電力変換装置及び第２電力変換装置の冷却効率を向上させることができる。 The cooling air duct, which is a cylindrical body, is arranged so that the periphery of the first hole is in close contact with the first power converter and the periphery of the second hole is in close contact with the second power converter. Therefore, there is no gap between the first power converter or the second power converter and the cooling air duct, and the cooling air can be prevented from leaking outside. In addition, since the cooling air duct is made of resin, the cooling air duct is appropriately brought into close contact with the first power conversion device and the second power conversion device while absorbing a dimensional error generated when the cooling structure is manufactured. Can do.
As a result, heat exchange between the first heat sink and the second heat sink and the cooling air disposed so as to face each other is performed with high efficiency, and the cooling efficiency of the first power converter and the second power converter is improved. Can do.
　また、一対の前記保持部はそれぞれ、前記第１電力変換装置と前記第２電力変換装置とを離間させるように、高さ方向に延在する支持部と、前記支持部の一端から幅方向内側に延びると共に、幅方向において前記支持部と前記冷却風ダクトとの間で前記第２電力変換装置にボルト締結される締結部と、を有することが好ましい。 Each of the pair of holding portions includes a support portion extending in a height direction so as to separate the first power conversion device and the second power conversion device, and a width direction inner side from one end of the support portion. And a fastening part that is bolted to the second power converter between the support part and the cooling air duct in the width direction.
　このような構成によれば、締結部は、支持部の一端から幅方向内側に延びている。換言すると、第２電力変換装置とフレーム部材とを組み付けた状態において、それぞれの締結部は、その先端が幅方向において互いに近づくように延在している。したがって、各支持部及び各締結部を含んで一枚の板金でフレーム部材を形成しやすくなる。
　また、筒状体である冷却風ダクトと、高さ方向に延在する支持部と、の間にできる幅方向の隙間において、締結部を第２電力変換装置と適切にボルト締結（結合）できる。なお、前記したボルト締結とは、互いに対応するボルト及びナットを用いた締結を意味している。 According to such a configuration, the fastening portion extends inward in the width direction from one end of the support portion. In other words, in a state where the second power conversion device and the frame member are assembled, the respective fastening portions extend so that their tips approach each other in the width direction. Therefore, it becomes easy to form a frame member with one sheet metal including each support part and each fastening part.
Further, the fastening portion can be appropriately bolted (coupled) to the second power conversion device in the gap in the width direction formed between the cooling air duct that is a cylindrical body and the support portion extending in the height direction. . The bolt fastening described above means fastening using bolts and nuts corresponding to each other.
　また、前記フレーム部材は、前記第２ヒートシンクが挿入される挿入孔を形成するように、それぞれの前記締結部と一体形成される連結部を備えることが好ましい。 In addition, it is preferable that the frame member includes a connection portion that is integrally formed with each of the fastening portions so as to form an insertion hole into which the second heat sink is inserted.
　このような構成によれば、フレーム部材は、一対の保持部と連結部とが一体形成される。したがって、例えば、一枚の板金を折曲加工・穿設加工等することでフレーム部材を形成することが可能であり、フレーム部材を製造する際の手間を省くと共に冷却構造体の部品点数を削減できる。なお、挿入孔は、第２ヒートシンクに対応した任意の形（例えば、矩形状）に形成できる。 According to such a configuration, the frame member is integrally formed with the pair of holding portions and the connecting portion. Therefore, for example, it is possible to form a frame member by bending or punching a single sheet metal, which saves the trouble of manufacturing the frame member and reduces the number of parts of the cooling structure. it can. The insertion hole can be formed in an arbitrary shape (for example, a rectangular shape) corresponding to the second heat sink.
　また、前記冷却構造体において、前記第１電力変換装置と前記フレーム部材とを締結するボルトの挿通位置と、前記第２電力変換装置と前記フレーム部材とを締結するボルトの挿通位置と、が前記第１電力変換装置及び前記第２電力変換装置の組付方向において重ならないことが好ましい。 Further, in the cooling structure, the insertion position of a bolt that fastens the first power conversion device and the frame member, and the insertion position of a bolt that fastens the second power conversion device and the frame member, It is preferable that the first power converter and the second power converter do not overlap in the assembly direction.
　このような構成によれば、第１電力変換装置とフレーム部材とを締結する工程と、第２電力変換装置とフレーム部材とを締結する工程と、を分ける必要がない。すなわち、前記した各締結を行うためのボルトの挿通位置が組付方向において重ならないため、第１電力変換装置、冷却風ダクト、フレーム部材、及び第２電力変換装置の組付作業及び締結作業を一括して行うことができる。したがって、冷却構造体を製造する際の工数を削減できる。 According to such a configuration, there is no need to separate the step of fastening the first power conversion device and the frame member and the step of fastening the second power conversion device and the frame member. That is, since the insertion positions of the bolts for performing each fastening described above do not overlap in the assembly direction, the assembly work and fastening work of the first power conversion device, the cooling air duct, the frame member, and the second power conversion device are performed. Can be done in a lump. Therefore, the man-hour at the time of manufacturing a cooling structure can be reduced.
　本発明によれば、冷却効率を向上させた冷却構造体を提供できる。 According to the present invention, a cooling structure with improved cooling efficiency can be provided.
本発明の一実施形態に係る冷却構造体を右後方から視た斜視図である。It is the perspective view which looked at the cooling structure concerning one embodiment of the present invention from the right rear. 図１に示す冷却構造体のＡ－Ａ矢視断面図である。FIG. 2 is a cross-sectional view of the cooling structure shown in FIG. 図２に示す冷却構造体のＢ－Ｂ矢視端面図である。FIG. 3 is an end view taken along the line BB of the cooling structure shown in FIG. 2. 冷却構造体を右後方から視た分解斜視図である。It is the disassembled perspective view which looked at the cooling structure from the right rear. フレーム部材の保持部、冷却風ダクト、及びＰＤＵが締結された箇所を左前方から視た部分拡大図であり、（ａ）は右側の締結箇所の断面斜視図であり、（ｂ）は左側の締結箇所の断面斜視図である。It is the elements on larger scale which looked at the location where the holding | maintenance part of the frame member, the cooling air duct, and PDU were fastened from the left front, (a) is a cross-sectional perspective view of the right fastening location, (b) is the left side It is a cross-sectional perspective view of a fastening location. 組み付けられた状態の冷却構造体を下方から視た下面図である。It is the bottom view which looked at the cooling structure of the assembled state from the lower part.
　本発明を実施するための形態（以下、実施形態と記す）について、適宜図面を参照しながら詳細に説明する。以下では、一例として、「第１電力変換装置」がＰＤＵ１０（Power Drive Unit：図１参照）であり、「第２電力変換装置」がＤＣ－ＤＣコンバータ２０（図１参照）である場合について説明する。また、向きを説明する場合、図１に示す上下前後左右に基づいて説明する。 DETAILED DESCRIPTION Embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the drawings as appropriate. Hereinafter, as an example, a case where the “first power conversion device” is the PDU 10 (Power Drive Unit: see FIG. 1) and the “second power conversion device” is the DC-DC converter 20 (see FIG. 1) will be described. To do. Further, the direction will be described based on the top, bottom, front, back, left, and right shown in FIG.
≪実施形態≫
　まず、本実施形態に係る冷却構造体Ａに先立って、ＰＤＵ１０及びＤＣ－ＤＣコンバータ２０について、図１～図４を参照しつつ説明する。なお、ＰＤＵ１０及びＤＣ－ＤＣコンバータ２０は、バッテリ（図示せず）の充放電や走行モータ（図示せず）の力行／回生駆動を制御するＰＣＵ（Power Control Unit）に含まれ、例えば、車両のリヤシート（図示せず）の下に搭載される。 <Embodiment>
First, prior to the cooling structure A according to the present embodiment, the PDU 10 and the DC-DC converter 20 will be described with reference to FIGS. The PDU 10 and the DC-DC converter 20 are included in a PCU (Power Control Unit) that controls charging / discharging of a battery (not shown) and power running / regenerative driving of a traveling motor (not shown). It is mounted under a rear seat (not shown).
（ＰＤＵ）
　図１に示すＰＤＵ１０（第１電力変換装置）は、バッテリ及び走行モータと電気的に接続され、バッテリからの直流電力を所定の交流電力に変換するインバータとして機能する。
　ＰＤＵ１０（図４参照）は、スイッチング素子や抵抗等の電子回路（発熱体：図示せず）を有する本体部１１と、この本体部１１と熱交換可能に配設されたヒートシンク１２（第１ヒートシンク）と、本体部１１を収容する収容部１３と、を有している。 (PDU)
The PDU 10 (first power conversion device) shown in FIG. 1 is electrically connected to the battery and the travel motor, and functions as an inverter that converts DC power from the battery into predetermined AC power.
The PDU 10 (see FIG. 4) includes a main body 11 having an electronic circuit (heating element: not shown) such as a switching element and a resistor, and a heat sink 12 (first heat sink) disposed so as to be able to exchange heat with the main body 11. ) And a housing part 13 for housing the main body part 11.
　図４に示すように、本体部１１の左右両側には、本体部１１と収容部１３とを締結するための一対のフランジ１１ａ，１１ｂが形成されている。右側のフランジ１１ａは前後方向に延びており、収容部１３の底壁１３１に溶着されたボルトｂ１を挿通するための挿通孔ｈ１が２つ形成されている。左側のフランジ１１ｂについても同様である。
　ヒートシンク１２は、互いに平行に配置される複数の放熱フィンを有し、本体部１１と熱交換可能に配設されている。放熱フィンは側面視で矩形状を呈する金属板（例えば、アルミニウム）であり、左右方向で隣り合う他の放熱フィンと所定間隔を空けて互いに平行に配置されている。 As shown in FIG. 4, a pair of flanges 11 a and 11 b for fastening the main body part 11 and the accommodating part 13 are formed on the left and right sides of the main body part 11. The right flange 11a extends in the front-rear direction, and two insertion holes h1 through which the bolts b1 welded to the bottom wall 131 of the housing portion 13 are inserted are formed. The same applies to the left flange 11b.
The heat sink 12 has a plurality of heat radiating fins arranged in parallel to each other, and is arranged so as to be able to exchange heat with the main body 11. The radiating fin is a metal plate (for example, aluminum) that has a rectangular shape in a side view, and is disposed in parallel to each other with a predetermined interval from other radiating fins adjacent in the left-right direction.
　収容部１３（図４参照）は、ヒートシンク１２を露出させた状態で本体部１１を収容する部材であり、凹状（上方が開いた箱状）に形成されている。収容部１３の底壁１３１には、ヒートシンク１２が挿入される矩形状の孔Ｈ１が形成されている。なお、収容部１３は、本体部１１に接続される配線（図示せず）を引き回すために、本体部１１の側面に対して自身の内側面が、前後・左右方向で所定の余裕を有するように形成されている。 The accommodating part 13 (refer FIG. 4) is a member which accommodates the main-body part 11 in the state which exposed the heat sink 12, and is formed in the concave shape (box shape with the upper part opened). A rectangular hole H1 into which the heat sink 12 is inserted is formed in the bottom wall 131 of the accommodating portion 13. In addition, in order for the accommodating part 13 to route the wiring (not shown) connected to the main body part 11, the inner side surface of the accommodating part 13 has a predetermined margin in the front-rear and left-right directions with respect to the side surface of the main body part 11. Is formed.
　収容部１３の底壁１３１の上面（底面）には、上方に向けて突出する４つのボルトｂ１が溶着されている。収容部１３に本体部１１を収容する際、各ボルトｂ１が前記したフランジ１１ａ，１１ｂの挿通孔ｈ１に挿通される。
　一方、収容部１３の底壁１３１の下面には、下方に向けて突出する４つのボルトｂ４が溶着されている。これらのボルトｂ４は、ＰＤＵ１０を冷却風ダクト３０及びフレーム部材４０と締結するために予め溶着されている。 Four bolts b <b> 1 projecting upward are welded to the upper surface (bottom surface) of the bottom wall 131 of the housing portion 13. When the main body 11 is accommodated in the accommodating portion 13, each bolt b1 is inserted into the insertion hole h1 of the flange 11a, 11b.
On the other hand, four bolts b4 projecting downward are welded to the lower surface of the bottom wall 131 of the accommodating portion 13. These bolts b4 are welded in advance to fasten the PDU 10 to the cooling air duct 30 and the frame member 40.
（ＤＣ－ＤＣコンバータ）
　図４に示すＤＣ－ＤＣコンバータ２０（第２電力変換装置）は、ＥＣＵ（Electric Control Unit：図示せず）からの制御指令に応じて電圧を昇降圧する装置であり、バッテリ（図示せず）や各種電装部品（図示せず）と電気的に接続される。ＤＣ－ＤＣコンバータ２０は、スイッチング素子や抵抗等の電子回路（発熱体：図示せず）を有する本体部２１と、この本体部２１と熱交換可能に配設されたヒートシンク２２（第２ヒートシンク：図４参照）と、を有している。 (DC-DC converter)
A DC-DC converter 20 (second power converter) shown in FIG. 4 is a device that steps up and down a voltage in response to a control command from an ECU (Electric Control Unit: not shown), and includes a battery (not shown), It is electrically connected to various electrical components (not shown). The DC-DC converter 20 includes a main body 21 having an electronic circuit (heating element: not shown) such as a switching element and a resistor, and a heat sink 22 (second heat sink: 4).
　本体部２１の上壁には、この本体部２１をフレーム部材４０と締結するためのフランジ２１ａが形成されている。フランジ２１ａにおいて前後・左右の四隅には、下方に突出するようにフレーム部材４０に溶着されたボルトｂ２を挿通するための挿通孔ｈ２がそれぞれ形成されている。
　ヒートシンク２２は、互いに平行に配置される複数の放熱フィンを有し、本体部２１と熱交換可能に配設されている。放熱フィンは側面視で矩形状を呈する金属板（例えば、アルミニウム）であり、左右方向で隣り合う他の放熱フィンと所定間隔を空けて互いに平行に配置されている。 A flange 21 a for fastening the main body 21 to the frame member 40 is formed on the upper wall of the main body 21. In the flange 21a, insertion holes h2 through which bolts b2 welded to the frame member 40 are inserted are formed at the front, rear, left and right corners, respectively, so as to protrude downward.
The heat sink 22 has a plurality of heat radiating fins arranged in parallel to each other, and is arranged so as to be able to exchange heat with the main body 21. The radiating fin is a metal plate (for example, aluminum) that has a rectangular shape in a side view, and is disposed in parallel to each other with a predetermined interval from other radiating fins adjacent in the left-right direction.
＜冷却構造体の構成＞
　冷却構造体Ａは、ＰＤＵ１０及びＤＣ－ＤＣコンバータ２０を冷却風との熱交換によって冷却する機能を有している。冷却構造体Ａは、冷却風を通流させるための冷却風ダクト３０と、ＰＤＵ１０とＤＣ－ＤＣコンバータ２０とを結合するフレーム部材４０と、を備えている。 <Configuration of cooling structure>
The cooling structure A has a function of cooling the PDU 10 and the DC-DC converter 20 by heat exchange with cooling air. The cooling structure A includes a cooling air duct 30 for passing cooling air and a frame member 40 that couples the PDU 10 and the DC-DC converter 20.
（冷却風ダクト）
　図４に示すように、冷却風ダクト３０は、冷却風を通流させるためのダクト本体３１と、冷却風ダクト３０をＰＤＵ１０及びＤＣ－ＤＣコンバータ２０に密着させるためのシール部材３２ｐ，３２ｑと、一対のフランジ３３ａ，３３ｂと、を有している。
　ダクト本体３１は、樹脂製の筒状体であり、その内部に冷却風を通流させる流路を有している。ダクト本体３１には、ＰＤＵ１０のヒートシンク１２が挿入される第１孔Ｋ１と、このヒートシンク１２と対向するようにＤＣ－ＤＣコンバータ２０のヒートシンク２２が挿入される第２孔Ｋ２と、が形成されている。 (Cooling air duct)
As shown in FIG. 4, the cooling air duct 30 includes a duct body 31 for allowing the cooling air to flow, seal members 32p and 32q for closely attaching the cooling air duct 30 to the PDU 10 and the DC-DC converter 20, A pair of flanges 33a and 33b.
The duct main body 31 is a cylindrical body made of resin, and has a flow path through which cooling air flows. The duct body 31 is formed with a first hole K1 into which the heat sink 12 of the PDU 10 is inserted, and a second hole K2 into which the heat sink 22 of the DC-DC converter 20 is inserted so as to face the heat sink 12. Yes.
　換言すると、ダクト本体３１は、ヒートシンク１２，２２を左右方向から挟むように延在する側壁３４（図３参照）と、この側壁３４から冷却風の上流側に向かって延びる筒状の導入部３５（図２参照）と、側壁３４から冷却風の下流側に向かって延びる筒状の導出部３６（図２参照）と、が一体形成されている。
　図２に示すように、導入部３５は開口３５ｔが下方に臨むように形成され、導出部３６は開口３６ｔが前方に臨むように形成されている。それぞれの開口３５ｔ，３６ｔには、他の機器又は配管と結合された状態で冷却風の漏れを防止するためのシール部材３２ｒ、３２ｓが設置されている。 In other words, the duct body 31 includes a side wall 34 (see FIG. 3) extending so as to sandwich the heat sinks 12 and 22 from the left and right directions, and a cylindrical introduction portion 35 extending from the side wall 34 toward the upstream side of the cooling air. (See FIG. 2) and a cylindrical lead-out portion 36 (see FIG. 2) extending from the side wall 34 toward the downstream side of the cooling air are integrally formed.
As shown in FIG. 2, the introduction part 35 is formed so that the opening 35t faces downward, and the lead-out part 36 is formed so that the opening 36t faces forward. Seal members 32r and 32s are installed in the openings 35t and 36t, respectively, for preventing cooling air from leaking in a state where the openings are connected to other devices or pipes.
　図４に示すように、第１孔Ｋ１は矩形状の孔であり、ＰＤＵ１０のヒートシンク１２が冷却風ダクト３０内に臨むように、前記した収容部１３の孔Ｈ１よりも大きく形成されている。
　シール部材３２ｐは、内縁及び外縁が平面視で略矩形である環状の弾性部材（例えば、樹脂製）である。シール部材３２ｐは、第１孔Ｋ１の矩形状の縁を囲むようにダクト本体３１の上面に接着されている。ＰＤＵ１０を冷却風ダクト３０に組み付けて上下方向で押圧すると、シール部材３２ｐ（第１孔Ｋ１の周囲）が圧縮されて収容部１３の下面に密着する。 As shown in FIG. 4, the first hole K <b> 1 is a rectangular hole, and is formed larger than the hole H <b> 1 of the housing portion 13 so that the heat sink 12 of the PDU 10 faces the cooling air duct 30.
The sealing member 32p is an annular elastic member (for example, made of resin) whose inner edge and outer edge are substantially rectangular in plan view. The seal member 32p is bonded to the upper surface of the duct body 31 so as to surround the rectangular edge of the first hole K1. When the PDU 10 is assembled to the cooling air duct 30 and pressed in the vertical direction, the seal member 32p (around the first hole K1) is compressed and closely contacts the lower surface of the housing portion 13.
　第２孔Ｋ２は矩形状の孔であり、ＤＣ－ＤＣコンバータ２０のヒートシンク２２が冷却風ダクト３０内に臨むように、後記するフレーム部材４０の挿入孔Ｈ４と略同一の大きさに（又は、挿入孔Ｈ４よりも大きく）形成されている。
　シール部材３２ｑは、内縁及び外縁が平面視で略矩形である環状の弾性部材（例えば、樹脂製）である。シール部材３２ｑは、第２孔Ｋ２の矩形状の縁を囲むようにダクト本体３１の下面に接着されている。ＤＣ－ＤＣコンバータ２０を、フレーム部材４０を介し冷却風ダクト３０に組み付けて上下方向で押圧すると、シール部材３２ｑ（第２孔Ｋ２の周囲）が圧縮されてフレーム部材４０に密着する。 The second hole K2 is a rectangular hole, and has substantially the same size as an insertion hole H4 of the frame member 40 (or later) so that the heat sink 22 of the DC-DC converter 20 faces the cooling air duct 30 (or Larger than the insertion hole H4).
The seal member 32q is an annular elastic member (for example, made of resin) whose inner edge and outer edge are substantially rectangular in plan view. The seal member 32q is bonded to the lower surface of the duct body 31 so as to surround the rectangular edge of the second hole K2. When the DC-DC converter 20 is assembled to the cooling air duct 30 via the frame member 40 and pressed in the vertical direction, the seal member 32q (around the second hole K2) is compressed and is in close contact with the frame member 40.
　一対のフランジ３３ａ，３３ｂは、ダクト本体３１の側壁３４（図２、図３参照）にそれぞれ設置されている。右側のフランジ３３ａは前後方向に延びており、収容部１３の下面から突出するボルトｂ４を挿通するための挿通孔ｈ３が２つ形成されている。左側のフランジ３３ｂについても同様である。 The pair of flanges 33a and 33b are respectively installed on the side walls 34 of the duct body 31 (see FIGS. 2 and 3). The right flange 33a extends in the front-rear direction, and two insertion holes h3 are formed through which bolts b4 protruding from the lower surface of the housing portion 13 are inserted. The same applies to the left flange 33b.
（フレーム部材）
　図４に示すフレーム部材４０は、ＰＤＵ１０及びＤＣ－ＤＣコンバータ２０に結合される板状部材であり、例えば、一枚の板金を折曲加工・穿設加工等することで形成される。これによって、ＰＤＵ１０、冷却風ダクト３０、フレーム部材４０、及びＤＣ－ＤＣコンバータ２０の結合強度を充分に確保できる。
　フレーム部材４０は、ＰＤＵ１０とＤＣ－ＤＣコンバータ２０とを高さ方向において離間した状態で保持する一対の保持部４２ａ，４２ｂと、これらの保持部４２ａ，４２ｂを連結する一対の連結部４１と、を有している。 (Frame member)
The frame member 40 shown in FIG. 4 is a plate-like member coupled to the PDU 10 and the DC-DC converter 20, and is formed, for example, by bending or punching one sheet metal. Thereby, the coupling strength of the PDU 10, the cooling air duct 30, the frame member 40, and the DC-DC converter 20 can be sufficiently secured.
The frame member 40 includes a pair of holding portions 42a and 42b that hold the PDU 10 and the DC-DC converter 20 in a state of being separated from each other in the height direction, and a pair of connecting portions 41 that connect the holding portions 42a and 42b. have.
　保持部４２ａは、支持部４２１ａと、支持部４２１ａの上端から右側に延びるフランジ４２２ａと、支持部４２１ａの下端から左側に延びる締結部４２３ａと、を有している。
　支持部４２１ａは、冷却風の通流方向（前後方向）に沿って延び、ＰＤＵ１０とＤＣ－ＤＣコンバータ２０とを離間させるように高さ方向に延在している。
　フランジ４２２ａは、冷却風ダクト３０のフランジ３３ａと共にＰＤＵ１０に結合される部分であり、支持部４２１ａの上端から右側（幅方向外側）に延びている。フランジ４２２ａには、収容部１３の下面から突出するボルトｂ４を挿通するための挿通孔ｈ４が２つ形成されている。 The holding part 42a includes a support part 421a, a flange 422a extending from the upper end of the support part 421a to the right side, and a fastening part 423a extending from the lower end of the support part 421a to the left side.
The support portion 421a extends along the flow direction (front-rear direction) of the cooling air, and extends in the height direction so as to separate the PDU 10 and the DC-DC converter 20.
The flange 422a is a portion coupled to the PDU 10 together with the flange 33a of the cooling air duct 30, and extends from the upper end of the support portion 421a to the right side (width direction outer side). Two insertion holes h4 for inserting bolts b4 protruding from the lower surface of the accommodating portion 13 are formed in the flange 422a.
　締結部４２３ａは、ＤＣ－ＤＣコンバータ２０のフランジ２１ａに結合される部分であり、支持部４２１ａの下端から左側（幅方向内側）に延びている。締結部４２３ａには、フランジ２１ａの挿通孔ｈ２に挿通される２つのボルトｂ２が、下方に向けて突出するように溶着されている。
　締結部４２３ａは、自身にＤＣ－ＤＣコンバータ２０及び冷却風ダクト３０が組み付けられた状態で、幅方向において冷却風ダクト３０の側壁３４（図３参照）と支持部４２１ａとの間でＤＣ－ＤＣコンバータ２０にボルト締結される。なお、前記した「ボルト締結」とは、互いに対応するボルトｂ２及びナットｍ２を用いた締結を意味している。 The fastening portion 423a is a portion coupled to the flange 21a of the DC-DC converter 20, and extends from the lower end of the support portion 421a to the left (in the width direction). Two bolts b2 inserted into the insertion hole h2 of the flange 21a are welded to the fastening portion 423a so as to protrude downward.
The fastening portion 423a is DC-DC between the side wall 34 (see FIG. 3) of the cooling air duct 30 and the support portion 421a in the width direction in a state where the DC-DC converter 20 and the cooling air duct 30 are assembled to itself. A bolt is fastened to the converter 20. The above-described “bolt fastening” means fastening using the bolt b2 and the nut m2 corresponding to each other.
　保持部４２ｂは、支持部４２１ｂと、支持部４２１ｂの上端から左側に延びるフランジ４２２ｂと、支持部４２１ｂの下端から右側に延びる締結部４２３ｂと、を有している。保持部４２ｂについては、前記した保持部４２ａと同様の構成であるから説明を省略する。 The holding part 42b has a support part 421b, a flange 422b extending from the upper end of the support part 421b to the left side, and a fastening part 423b extending from the lower end of the support part 421b to the right side. Since the holding part 42b has the same configuration as the holding part 42a described above, the description thereof is omitted.
　一対の連結部４１は、右側の締結部４２３ａと左側の締結部４２３ｂとを連結するように、左右方向に延びている。すなわち、それぞれの連結部４１は、ヒートシンク２２が挿入される矩形状の挿入孔Ｈ４を形成するように一対の締結部４２３ａ，４２３ｂと一体形成されている。なお、挿入孔Ｈ４は、ＤＣ－ＤＣコンバータ２０のヒートシンク２２を挿入可能な大きさに形成されている。
　したがって、一枚の板金を折曲加工・穿設加工等することでフレーム部材４０を形成することができ、フレーム部材４０を製造する際の手間を省くと共に冷却構造体Ａの部品点数を最小限に抑えることができる。 The pair of connecting portions 41 extend in the left-right direction so as to connect the right fastening portion 423a and the left fastening portion 423b. That is, each connecting portion 41 is integrally formed with the pair of fastening portions 423a and 423b so as to form a rectangular insertion hole H4 into which the heat sink 22 is inserted. The insertion hole H4 is formed in a size that allows the heat sink 22 of the DC-DC converter 20 to be inserted.
Therefore, it is possible to form the frame member 40 by bending or punching a single sheet metal, saving time and trouble of manufacturing the frame member 40 and minimizing the number of parts of the cooling structure A. Can be suppressed.
＜冷却構造体の組付手順＞
　次に、図３～図６を参照しつつ、冷却構造体Ａの組付手順について説明する。
　図４に示すように、本体部１１のフランジ１１ａ，１１ｂに形成された４つの孔ｈ１に、収容部１３の底壁１３１から上方に向けて突出するボルトｂ１を挿通させ、ナットｍ１で締結する。なお、ボルトｂ１は収容部１３の底壁１３１に予め溶着されているため、ボルト（図示せず）を別体として用意しナットｍ１で締結する場合と比較して、締結作業を簡単化できる。
　このようにしてＰＤＵ１０の本体部１１と収容部１３とを締結すると、収容部１３の孔Ｈ１を介してヒートシンク１２が露出した状態になる。 <Assembly procedure of cooling structure>
Next, the procedure for assembling the cooling structure A will be described with reference to FIGS.
As shown in FIG. 4, bolts b1 protruding upward from the bottom wall 131 of the housing portion 13 are inserted into the four holes h1 formed in the flanges 11a and 11b of the main body portion 11, and fastened with a nut m1. . Since the bolt b1 is welded to the bottom wall 131 of the accommodating portion 13 in advance, the fastening operation can be simplified as compared with a case where a bolt (not shown) is prepared as a separate body and fastened with the nut m1.
When the main body 11 and the housing 13 of the PDU 10 are fastened in this way, the heat sink 12 is exposed through the hole H1 of the housing 13.
　次に、下方に向けて突出するようにフレーム部材４０の締結部４２３ａ，４２３ｂに溶着されたボルトｂ２を、ＤＣ－ＤＣコンバータ２０の挿通孔ｈ２に挿通させ、締結部４２３ａ，４２３ｂ及び連結部４１の下面をフランジ２１ａの上面に密着させる（図３参照）。そうすると、フレーム部材４０の挿入孔Ｈ４を介してヒートシンク２２が露出した状態になる。
　なお、ボルトｂ２とナットｍ２との締結については、後記するボルトｂ４とナットｍ４との締結と併せて、一括して行うことが好ましい。 Next, the bolt b2 welded to the fastening portions 423a and 423b of the frame member 40 so as to protrude downward is inserted into the insertion hole h2 of the DC-DC converter 20, and the fastening portions 423a and 423b and the connecting portion 41 are inserted. The lower surface is closely attached to the upper surface of the flange 21a (see FIG. 3). Then, the heat sink 22 is exposed through the insertion hole H4 of the frame member 40.
In addition, about fastening with the volt | bolt b2 and the nut m2, it is preferable to collectively carry out together with the fastening with the volt | bolt b4 and the nut m4 which are mentioned later.
　次に、上下方向においてＰＤＵ１０、冷却風ダクト３０、フレーム部材４０、及びＤＣ－ＤＣコンバータ２０が順次並ぶように配置し、相互に組み付ける。すなわち、収容部１３の底壁１３１に溶着された４つのボルトｂ４を、フランジ３３ａ，３３ｂの挿通孔ｈ３と、フランジ４２２ａ，４２２ｂの挿通孔ｈ４と、に挿通する。そうすると、ＰＤＵ１０のヒートシンク１２が第１孔Ｋ１を介して冷却風の流路に露出し、ＤＣ－ＤＣコンバータ２０のヒートシンク２２が挿入孔Ｈ４及び第２孔Ｋ２を介して冷却風の流路に露出する。この状態において、ヒートシンク１２，２２は、それぞれの放熱フィンが同じ方向（前後方向）に延び、かつ、上下方向で相互に対向している。したがって、冷却風が通流する際の流体抵抗を最小限に抑えることができる。 Next, the PDU 10, the cooling air duct 30, the frame member 40, and the DC-DC converter 20 are sequentially arranged in the vertical direction and assembled to each other. That is, the four bolts b4 welded to the bottom wall 131 of the housing portion 13 are inserted into the insertion holes h3 of the flanges 33a and 33b and the insertion holes h4 of the flanges 422a and 422b. Then, the heat sink 12 of the PDU 10 is exposed to the cooling air flow path through the first hole K1, and the heat sink 22 of the DC-DC converter 20 is exposed to the cooling air flow path through the insertion hole H4 and the second hole K2. To do. In this state, the heat sinks 12 and 22 have their heat radiating fins extending in the same direction (front-rear direction) and facing each other in the vertical direction. Therefore, it is possible to minimize the fluid resistance when the cooling air flows.
　次に、ＰＤＵ１０、冷却風ダクト３０、フレーム部材４０、及びＤＣ－ＤＣコンバータ２０をナットｍ２，ｍ４を用いて結合（締結）する。すなわち、図４、図５（ａ）に示すように、収容部１３に溶着されたボルトｂ４を、右側のフランジ３３ａの挿通孔ｈ３、及びフランジ４２２ａの挿通孔ｈ４に挿通し、下方からナットｍ４で締結する。
　また、図４、図５（ｂ）に示すように、収容部１３に溶着されたボルトｂ４を、左側のフランジ３３ｂの挿通孔ｈ３、及びフランジ４２２ｂの挿通孔ｈ４に挿通し、下方からナットｍ４で締結する。
　さらに、図４に示すように、締結部４２３ａ，４２３ｂに溶着されたボルトｂ２をＤＣ－ＤＣコンバータ２０のフランジ２１ａの挿通孔ｈ２に挿通し、下方からナットｍ２で締結する。 Next, the PDU 10, the cooling air duct 30, the frame member 40, and the DC-DC converter 20 are coupled (fastened) using nuts m2 and m4. That is, as shown in FIGS. 4 and 5 (a), the bolt b4 welded to the housing portion 13 is inserted into the insertion hole h3 of the right flange 33a and the insertion hole h4 of the flange 422a, and the nut m4 from below. Conclude with.
Further, as shown in FIGS. 4 and 5B, the bolt b4 welded to the accommodating portion 13 is inserted into the insertion hole h3 of the left flange 33b and the insertion hole h4 of the flange 422b, and the nut m4 from below. Conclude with.
Further, as shown in FIG. 4, the bolt b2 welded to the fastening portions 423a and 423b is inserted into the insertion hole h2 of the flange 21a of the DC-DC converter 20, and fastened with a nut m2 from below.
　ところで、図６に示すように、ＰＤＵ１０とフレーム部材４０とを締結するボルトｂ４の挿通位置（工具ライン：○印）と、ＤＣ－ＤＣコンバータ２０とフレーム部材４０とを締結するボルトｂ２の挿通位置（工具ライン：△印）と、は組付方向（上下方向）において重なっていない。 By the way, as shown in FIG. 6, the insertion position of the bolt b4 that fastens the PDU 10 and the frame member 40 (tool line: ◯), and the insertion position of the bolt b2 that fastens the DC-DC converter 20 and the frame member 40. (Tool line: Δ mark) does not overlap in the assembly direction (vertical direction).
　つまり、組み付けた状態の冷却構造体Ａを下方から視ると、ボルトｂ２，ｂ４（○印、△印）が露出した状態になる。したがって、合計８個のボルトｂ２，ｂ４それぞれに対し一括してナットｍ２，ｍ４を締結すればよく、複数段階に分けて締結作業を行う場合と比較して組付作業を簡単化・高速化できる。また、ボルトｂ２はフレーム部材４０の締結部４２３ａ，４２３ｂに溶着され、ボルトｂ４は収容部１３の底壁１３１に溶着されている。したがって、下方からナットｍ２，ｍ４を締めさえすればよく、締結作業を簡単化できる。 That is, when the assembled cooling structure A is viewed from below, the bolts b2 and b4 (◯ and Δ) are exposed. Therefore, the nuts m2 and m4 may be fastened together for each of the eight bolts b2 and b4 in total, and the assembling work can be simplified and speeded up as compared with the case where the fastening work is performed in a plurality of stages. . The bolt b <b> 2 is welded to the fastening portions 423 a and 423 b of the frame member 40, and the bolt b <b> 4 is welded to the bottom wall 131 of the housing portion 13. Therefore, it is only necessary to tighten the nuts m2 and m4 from below, and the fastening operation can be simplified.
　前記した締結がなされると、ヒートシンク１２，２２を左右方向で挟む冷却風ダクト３０の側壁３４（図３参照）と、ＰＤＵ１０の下面（ヒートシンク１２の表面を含む）と、ＤＣ－ＤＣコンバータ２０の上面（ヒートシンク２２を含む）と、によって冷却風を通流させる流路が形成される。なお、前記したように、冷却風ダクト３０の側壁３４から上流側に筒状の導入部３５が延び、下流側に筒状の導出部３６が延びている。 When the fastening described above is performed, the side wall 34 (see FIG. 3) of the cooling air duct 30 that sandwiches the heat sinks 12 and 22 in the left-right direction, the lower surface of the PDU 10 (including the surface of the heat sink 12), and the DC-DC converter 20 A flow path through which cooling air flows is formed by the upper surface (including the heat sink 22). As described above, the cylindrical introduction portion 35 extends from the side wall 34 of the cooling air duct 30 to the upstream side, and the cylindrical lead-out portion 36 extends to the downstream side.
　また、前記した締結作業によって、弾性を有するシール部材３２ｐ，３２ｑが上下方向で圧縮される。その結果、シール部材３２ｐがＰＤＵ１０の収容部１３の下面に密着し、シール部材３２ｑがフレーム部材４０の連結部４１及び締結部４２３ａ，４２３ｂの上面に密着する。したがって、冷却風ダクト３０とＰＤＵ１０との間、及び、冷却風ダクト３０とＤＣ－ＤＣコンバータ２０との間に隙間ができず、冷却風が外部に漏れることを確実に防止できる。 Moreover, the sealing members 32p and 32q having elasticity are compressed in the vertical direction by the fastening operation described above. As a result, the seal member 32p is in close contact with the lower surface of the housing portion 13 of the PDU 10, and the seal member 32q is in close contact with the upper surface of the coupling portion 41 and the fastening portions 423a and 423b of the frame member 40. Therefore, there is no gap between the cooling air duct 30 and the PDU 10 and between the cooling air duct 30 and the DC-DC converter 20, and it is possible to reliably prevent the cooling air from leaking outside.
＜作用＞
　図２の矢印で示すように、開口３５ｔを介して送り込まれた冷却風は、筒状の導入部３５内を通流し、冷却風ダクト３０の側壁３４（図３参照）、ＰＤＵ１０、及びＤＣ－ＤＣコンバータ２０によって形成される流路に流入する。当該流路を通流する際、冷却風はヒートシンク１２，２２から吸熱する。換言すると、ＰＤＵ１０はヒートシンク１２を介して冷却風に放熱することで冷却され、ＤＣ－ＤＣコンバータ２０はヒートシンク２２を介して冷却風に放熱することで冷却される。 <Action>
As shown by the arrows in FIG. 2, the cooling air sent through the opening 35t flows through the cylindrical introduction portion 35, and the side wall 34 of the cooling air duct 30 (see FIG. 3), the PDU 10, and the DC− It flows into the flow path formed by the DC converter 20. When flowing through the flow path, the cooling air absorbs heat from the heat sinks 12 and 22. In other words, the PDU 10 is cooled by dissipating heat to the cooling air via the heat sink 12, and the DC-DC converter 20 is cooled by dissipating heat to the cooling air via the heat sink 22.
　なお、冷却風ダクト３０は樹脂製であるため、自身の変形によって製造時の寸法誤差を吸収できる。さらに、弾性を有するシール部材３２ｐ，３２ｑによって、冷却風ダクト３０がＰＤＵ１０及びＤＣ－ＤＣコンバータ２０に密着している。したがって、冷却風が外部に漏れることを確実に防止できる。前記した吸熱によって昇温した冷却風は、筒状の導出部３６を通流し、開口３６ｔを介して流出する。 In addition, since the cooling air duct 30 is made of resin, a dimensional error at the time of manufacture can be absorbed by its own deformation. Further, the cooling air duct 30 is in close contact with the PDU 10 and the DC-DC converter 20 by elastic seal members 32p and 32q. Therefore, it is possible to reliably prevent the cooling air from leaking to the outside. The cooling air heated by the above-described heat absorption flows through the cylindrical outlet 36 and flows out through the opening 36t.
＜効果＞
　本実施形態に係る冷却構造体Ａによれば、第１孔Ｋ１を囲むように設置されるシール部材３２ｐがＰＤＵ１０に密着し、第２孔Ｋ２を囲むように設置されるシール部材３２ｑがフレーム部材４０に密着する。したがって、ＰＤＵ１０と冷却風ダクト３０との間、又は、冷却風ダクト３０とフレーム部材４０との間に隙間が生じることがなく、冷却風が外部に漏れることを確実に防止できる。その結果、ＰＤＵ１０及びＤＣ－ＤＣコンバータ２０を高効率で冷却でき、そのぶん冷却風を送る冷却ファン（図示せず）を小型化できる。 <Effect>
According to the cooling structure A according to the present embodiment, the seal member 32p installed so as to surround the first hole K1 is in close contact with the PDU 10, and the seal member 32q installed so as to surround the second hole K2 is the frame member. 40. Accordingly, there is no gap between the PDU 10 and the cooling air duct 30 or between the cooling air duct 30 and the frame member 40, and it is possible to reliably prevent the cooling air from leaking to the outside. As a result, the PDU 10 and the DC-DC converter 20 can be cooled with high efficiency, and a cooling fan (not shown) for sending the cooling air can be downsized.
　また、ＰＤＵ１０及びＤＣ－ＤＣコンバータ２０は、一対の保持部４２ａ，４２ｂ及び連結部４１を有するフレーム部材４０によって結合される。したがって、例えば、冷却風ダクト３０を樹脂製とした場合でも、フレーム部材４０によってＰＤＵ１０とＤＣ－ＤＣコンバータ２０との結合強度を充分に確保できる。
　つまり、本実施形態によれば、冷却風の流路を形成する役割を冷却風ダクト３０に担わせ、結合強度を確保する役割をフレーム部材４０に担わせることによって、充分な結合強度を確保しつつ冷却効率を向上させることができる。 The PDU 10 and the DC-DC converter 20 are coupled by a frame member 40 having a pair of holding portions 42 a and 42 b and a connecting portion 41. Therefore, for example, even when the cooling air duct 30 is made of resin, the frame member 40 can sufficiently secure the coupling strength between the PDU 10 and the DC-DC converter 20.
That is, according to the present embodiment, the cooling air duct 30 is responsible for forming the cooling air flow path, and the frame member 40 is responsible for ensuring the coupling strength, thereby ensuring sufficient coupling strength. Cooling efficiency can be improved.
　また、フレーム部材４０は、支持部４２１ａから左側（幅方向内側）に延びる締結部４２３ａと、支持部４２１ｂから右側（幅方向内側）に延びる締結部４２３ｂと、を一対の連結部４１を介して連結した構成になっている。したがって、一枚の板金を折曲加工・穿設加工等することでフレーム部材４０を形成できると共に、冷却構造体Ａに必要な部品点数を削減できる。その結果、冷却構造体４０を製造する際の手間を省き、製造コストを大幅に削減できる。 Further, the frame member 40 includes a fastening portion 423a extending to the left side (width direction inner side) from the support portion 421a and a fastening portion 423b extending to the right side (width direction inner side) from the support portion 421b via a pair of connecting portions 41. It has a connected structure. Therefore, the frame member 40 can be formed by bending or punching one sheet metal, and the number of parts required for the cooling structure A can be reduced. As a result, the labor for manufacturing the cooling structure 40 can be saved, and the manufacturing cost can be greatly reduced.
　また、各締結を行うためのボルトｂ２，ｂ４の挿通位置（工具ライン）が組付方向において重なっていない。したがって、ＰＤＵ１０、冷却風ダクト３０、フレーム部材４０、及びＤＣ－ＤＣコンバータ２０を組み付けた状態で組付作業・締結作業を片側から一括して行い、冷却構造体Ａを製造する際の工数を削減できる。 Also, the insertion positions (tool lines) of the bolts b2 and b4 for performing each fastening do not overlap in the assembly direction. Therefore, the assembly work and the fastening work are collectively performed from one side in a state where the PDU 10, the cooling air duct 30, the frame member 40, and the DC-DC converter 20 are assembled, thereby reducing the man-hour when the cooling structure A is manufactured. it can.
≪変形例≫
　以上、本発明に係る冷却構造体Ａについて前記実施形態により説明したが、本発明はこれらの記載に限定されるものではなく、種々の変更を行うことができる。
　例えば、前記実施形態では、一枚の板金を折曲加工、穿設加工等することでフレーム部材４０を形成する場合について説明したが、これに限らない。すなわち、フレーム部材４０のうち一対の連結部４１を省略し、フレーム部材を２つの部品（つまり、保持部４２ａ，４２ｂ）に分けてもよい。この場合でも、それぞれのフレーム部材を用いてＰＤＵ１０、冷却風ダクト３０、及びＤＣ－ＤＣコンバータ２０を締結することで結合強度を確保できる。 ≪Modification≫
As mentioned above, although the cooling structure A which concerns on this invention was demonstrated by the said embodiment, this invention is not limited to these description, A various change can be made.
For example, in the above-described embodiment, the case where the frame member 40 is formed by bending or punching one sheet metal has been described, but the present invention is not limited thereto. That is, the pair of connecting portions 41 in the frame member 40 may be omitted, and the frame member may be divided into two parts (that is, the holding portions 42a and 42b). Even in this case, the coupling strength can be ensured by fastening the PDU 10, the cooling air duct 30, and the DC-DC converter 20 using the respective frame members.
　また、前記実施形態では、組付方向（上下方向）においてＰＤＵ１０（収容部１３）と保持部４２との間に冷却風ダクト３０のフランジ３３ａ，３３ｂが介在する場合について説明したが、これに限らない。すなわち、冷却風ダクト３０のフランジ３３ａ，３３ｂを省略し、ＰＤＵ１０と保持部４２とを密着させた状態で締結してもよい。この場合、高さ方向に延びる支持部４２１ａ，４２１ｂの長さを適宜調整することで、シール部材３２ｐをＰＤＵ１０に密着させ、かつ、シール部材３２ｑをフレーム部材４０に密着させることができる。 Moreover, although the said embodiment demonstrated the case where the flanges 33a and 33b of the cooling wind duct 30 were interposed between PDU10 (accommodating part 13) and the holding | maintenance part 42 in the assembly direction (up-down direction), it is not restricted to this. Absent. That is, the flanges 33a and 33b of the cooling air duct 30 may be omitted and the PDU 10 and the holding unit 42 may be fastened together. In this case, the seal member 32p can be brought into close contact with the PDU 10 and the seal member 32q can be brought into close contact with the frame member 40 by appropriately adjusting the lengths of the support portions 421a and 421b extending in the height direction.
　また、前記実施形態では、第１電力変換装置がＰＤＵ１０（インバータ）であり、第２電力変換装置がＤＣ－ＤＣコンバータ２０である場合について説明したが、これに限らない。例えば、第１、第２電力変換装置として、交流／直流変換用のコンバータ、ＶＣＵ（Voltage Control Unit）等、他の電力変換装置を用いてもよい。
　また、前記実施形態では、ＰＤＵ１０が収容部１３を有し、この収容部１３にボルトｂ１，ｂ４が予め溶着されている場合について説明したが、これに限らない。すなわち、収容部１３を省略し、フランジ１１ａ，１１ｂが左右方向に延びる長さを前記実施形態よりも長くし、このフランジ１１ａ，１１ｂにボルトｂ１，ｂ４を溶着してもよい。 In the above embodiment, the case where the first power conversion device is the PDU 10 (inverter) and the second power conversion device is the DC-DC converter 20 has been described. However, the present invention is not limited to this. For example, as the first and second power converters, other power converters such as an AC / DC converter, a VCU (Voltage Control Unit), and the like may be used.
Moreover, although the PDU 10 has the accommodating part 13 and the bolts b1 and b4 are previously welded to the accommodating part 13 in the embodiment, the present invention is not limited to this. That is, the accommodating part 13 may be omitted, the length of the flanges 11a and 11b extending in the left-right direction may be made longer than that in the above embodiment, and the bolts b1 and b4 may be welded to the flanges 11a and 11b.
　また、前記実施形態では、左右方向において冷却風ダクト３０よりも外側に保持部４２ａ，４２ｂ（図３、図４参照）を設ける場合について説明したが、これに限らない。すなわち、左右方向において冷却風ダクト３０よりも内側に保持部を配置し、この保持部の配置に対応してフランジ、ボルト等の配置を適宜設定してもよい。
　また、前記実施形態では、冷却構造体Ａの組付方向においてボルトｂ２，ｂ４が重ならず、下方から視てボルトｂ２，ｂ４が露出する場合について説明したが、これに限らない。例えば、冷却構造体の組付作業を一括して行った後、上方及び下方の両側からボルトを締結する構成としてもよい。 Moreover, although the said embodiment demonstrated the case where holding | maintenance part 42a, 42b (refer FIG. 3, FIG. 4) was provided outside the cooling air duct 30 in the left-right direction, it is not restricted to this. That is, a holding part may be arranged inside the cooling air duct 30 in the left-right direction, and the arrangement of flanges, bolts, and the like may be set as appropriate in accordance with the arrangement of the holding part.
Moreover, although the said embodiment demonstrated the case where the volt | bolt b2, b4 did not overlap in the assembly direction of the cooling structure A, and the volt | bolt b2, b4 was exposed seeing from the downward direction, it is not restricted to this. For example, it is good also as a structure which fastens a bolt from both upper and lower sides after performing the assembly | attachment operation | work of a cooling structure collectively.
　また、前記実施形態では、ＰＤＵ１０の底壁１３１に予めボルトｂ１，ｂ４が溶着され、フレーム部材４０の締結部４２３ａ，４２３ｂに予めボルトｂ２が溶着されている場合について説明したが、これに限らない。すなわち、別部材として用意したボルトをナットと締結してもよい。
　また、前記実施形態では、冷却構造体Ａをハイブリッド車に搭載する場合について説明したが、これに限らない。例えば、冷却構造体Ａを電気自動車や燃料電池車等、他の種類の自動車に搭載してもよい。また、冷却構造体Ａを二輪車、船舶、航空機等の移動体に搭載してもよいし、定置式のシステムに搭載してもよい。 Moreover, although the said embodiment demonstrated the case where the volt | bolt b1, b4 was welded previously to the bottom wall 131 of PDU10, and the volt | bolt b2 was welded previously to the fastening part 423a, 423b of the frame member 40, it is not restricted to this. . That is, a bolt prepared as a separate member may be fastened to the nut.
Moreover, although the said embodiment demonstrated the case where the cooling structure A was mounted in a hybrid vehicle, it is not restricted to this. For example, the cooling structure A may be mounted on other types of vehicles such as electric vehicles and fuel cell vehicles. Further, the cooling structure A may be mounted on a moving body such as a motorcycle, a ship, or an aircraft, or may be mounted on a stationary system.
　Ａ　冷却構造体
　１０　ＰＤＵ（第１電力変換装置）
　１１　本体部
　１２　ヒートシンク（第１ヒートシンク）
　１３　収容部
　２０　ＤＣ－ＤＣコンバータ（第２電力変換装置）
　２１　本体部
　２２　ヒートシンク（第２ヒートシンク）
　３０　冷却風ダクト
　３１　ダクト本体
　３２ｐ，３２ｑ　シール部材
　４０　フレーム部材
　４１　連結部
　４２ａ，４２ｂ　保持部
　４２１ａ，４２１ｂ　支持部
　４２２ａ，４２２ｂ　フランジ
　４２３ａ，４２３ｂ　締結部
　Ｋ１　第１孔
　Ｋ２　第２孔
　Ｈ４　挿入孔 A Cooling structure 10 PDU (first power converter)
11 Body 12 Heat sink (first heat sink)
13 Housing 20 DC-DC converter (second power converter)
21 Main body 22 Heat sink (second heat sink)
30 Cooling air duct 31 Duct body 32p, 32q Seal member 40 Frame member 41 Connection portion 42a, 42b Holding portion 421a, 421b Support portion 422a, 422b Flange 423a, 423b Fastening portion K1 First hole K2 Second hole H4 Insertion hole

Claims (4)

  1. 　第１ヒートシンクを有する第１電力変換装置と、第２ヒートシンクを有する第２電力変換装置と、を冷却風との熱交換によって冷却する冷却構造体であって、
    　前記第１ヒートシンクが挿入される第１孔と、前記第１ヒートシンクと対向するように前記第２ヒートシンクが挿入される第２孔と、が形成された樹脂製の筒状体である冷却風ダクトと、
    　前記第１電力変換装置と前記第２電力変換装置とを高さ方向において離間した状態で保持する一対の保持部を有すると共に、前記第１電力変換装置及び前記第２電力変換装置に結合されるフレーム部材と、を備え、
    　前記冷却風ダクトは、前記第１孔の周囲が前記第１電力変換装置に密着し、前記第２孔の周囲が前記第２電力変換装置に密着するように配置される
    　ことを特徴とする冷却構造体。     A cooling structure that cools a first power conversion device having a first heat sink and a second power conversion device having a second heat sink by heat exchange with cooling air,
    A cooling air duct that is a resin-made cylindrical body in which a first hole into which the first heat sink is inserted and a second hole into which the second heat sink is inserted so as to face the first heat sink are formed. When,
    The first power converter and the second power converter have a pair of holding units that are spaced apart in the height direction, and are coupled to the first power converter and the second power converter. A frame member,
    The cooling air duct is disposed such that the periphery of the first hole is in close contact with the first power converter, and the periphery of the second hole is in close contact with the second power converter. Structure.
  2. 　一対の前記保持部はそれぞれ、
    　前記第１電力変換装置と前記第２電力変換装置とを離間させるように、高さ方向に延在する支持部と、
    　前記支持部の一端から幅方向内側に延びると共に、幅方向において前記支持部と前記冷却風ダクトとの間で前記第２電力変換装置にボルト締結される締結部と、を有する
    　ことを特徴とする請求項１に記載の冷却構造体。     Each of the pair of holding portions is
    A support portion extending in a height direction so as to separate the first power converter and the second power converter;
    A fastening portion that extends inward in the width direction from one end of the support portion, and that is bolted to the second power converter between the support portion and the cooling air duct in the width direction. The cooling structure according to claim 1.
  3. 　前記フレーム部材は、
    　前記第２ヒートシンクが挿入される挿入孔を形成するように、それぞれの前記締結部と一体形成される連結部を備える
    　ことを特徴とする請求項２に記載の冷却構造体。     The frame member is
    The cooling structure according to claim 2, further comprising a connecting portion integrally formed with each of the fastening portions so as to form an insertion hole into which the second heat sink is inserted.
  4. 　前記第１電力変換装置と前記フレーム部材とを締結するボルトの挿通位置と、前記第２電力変換装置と前記フレーム部材とを締結するボルトの挿通位置と、が前記第１電力変換装置及び前記第２電力変換装置の組付方向において重ならない
    　ことを特徴とする請求項１から請求項３のいずれか一項に記載の冷却構造体。     The bolt insertion position for fastening the first power converter and the frame member and the bolt insertion position for fastening the second power converter and the frame member are the first power converter and the first The cooling structure according to any one of claims 1 to 3, wherein the two power converters do not overlap in the assembling direction.
PCT/JP2014/053420 2013-04-04 2014-02-14 Cooling structure WO2014162780A1 (en)

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