JP2019024042A - Vehicle driver - Google Patents

Abstract

To provide a vehicle driver capable of realizing a more suitable air-cooled heat dissipation structure.SOLUTION: A vehicle driver includes a first enclosure 21 having first and second walls 21a, 21b directing the directions different from each other and forming a first housing space for housing a first electrical component 22, a second enclosure 11 housing a motor part where a third wall 11a forming the second housing space is disposed to face the second wall 21b of the first enclosure 21, and a duct 50 for coupling the inlet side of a second refrigerant passage F, formed between the second wall 21b of the first enclosure 21 and the third wall 11a of the second enclosure 11, to the outlet side of the first refrigerant passage F1 formed along the outside wall surface of the first wall part 21a of the first enclosure 21.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to a vehicle drive device.

  In recent years, with the spread of small electric vehicles such as micro EVs and electric commuters, there is an increasing demand for downsizing and weight reduction of in-vehicle devices.

  From such a request, various structures including a drive motor and a power module (representing an inverter device, a charging device, a power storage device, etc .; the same applies hereinafter) and an air-cooling heat radiation structure that does not use a cooling water facility have been studied. (For example, see Patent Document 1 and Patent Document 2).

JP 2012-240477 A Japanese Patent Laid-Open No. 7-038025

  However, since the drive motor and the power module are heating elements, when applying a structure in which these are integrated, there is a possibility that a problem of heat transfer between adjacent devices may occur.

  In particular, in an air-cooled heat dissipation structure, the drive motor is likely to become hot, so heat transfer from the drive motor has an adverse effect on the electrical components of the adjacent power module (for example, changes in the characteristics of switching elements due to higher temperatures). Or damage).

  The present disclosure has been made in view of the above-described problems, and an object of the present disclosure is to provide a vehicle drive device that can realize a more preferable air-cooling heat dissipation structure.

The main present disclosure for solving the above-described problems is as follows.
A first housing having first and second wall portions facing in different directions forming a first storage space, and storing the first electrical component;
A second housing that houses the motor portion and that is arranged so that a third wall portion that forms a second housing space faces the second wall portion of the first housing;
With respect to the outlet side of the first refrigerant passage formed along the outer wall surface of the first wall of the first casing, the second wall of the first casing and the first wall A duct connecting the inlet side of the second refrigerant passage formed between the third wall of the two housings;
A vehicle drive device comprising:

  According to the vehicle drive device according to the present disclosure, it is possible to realize a more preferable air-cooled heat dissipation structure that can suppress the problem of heat transfer between adjacent devices.

The perspective view which shows the whole structure of the vehicle drive device which concerns on 1st Embodiment. 1 is a cross-sectional view showing the overall configuration of a vehicle drive device according to a first embodiment. The top view which looked at the radiation fin which the inverter apparatus which concerns on 1st Embodiment has from the upper surface The figure explaining the heat dissipation path | route of the vehicle drive device which concerns on 1st Embodiment. The perspective view which shows the whole structure of the vehicle drive device which concerns on 2nd Embodiment. The side view which shows the structure of the radiation fin of the vehicle drive device which concerns on 3rd Embodiment. The top view which shows the structure of the radiation fin of the vehicle drive device which concerns on 3rd Embodiment. The figure explaining the thermal radiation operation | movement of the vehicle drive device which concerns on 3rd Embodiment. The figure explaining the thermal radiation operation | movement of the vehicle drive device which concerns on 3rd Embodiment.

  Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the appended drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, the duplicate description is abbreviate | omitted by attaching | subjecting the same code | symbol.

(First embodiment)
[Configuration of vehicle drive device]
Hereinafter, an example of the configuration of the vehicle drive device A according to the present embodiment will be described with reference to FIGS. The vehicle drive device A according to the present embodiment is mounted on, for example, an electric vehicle or a hybrid vehicle.

  FIG. 1 is a perspective view showing the overall configuration of the vehicle drive device A. FIG. FIG. 2 is a cross-sectional view showing the overall configuration of the vehicle drive device A. FIG. 3 is a plan view of the heat dissipating fins 21af of the inverter device 20 as viewed from above.

  Each drawing shows a common orthogonal coordinate system (X, Y, Z) in order to clarify the positional relationship of each component. In the following description, it is assumed that the positive direction of the Z axis indicates the upward direction. In each figure, the direction in which the air refrigerant flows is indicated by an arrow Air. In the present embodiment, the air refrigerant indicates air used for cooling the vehicle drive device.

  The vehicle drive device A according to the present embodiment includes a drive motor 10, an inverter device 20, a charging device 30, a fan 40, a duct 50, a first refrigerant passage F1, and a second refrigerant passage F2.

  The vehicle drive device A has a structure in which a drive motor 10, an inverter device 20, and a charging device 30 are integrally disposed. Specifically, as shown in FIGS. 1 and 2, a drive motor 10, an inverter device 20, and a charging device 30 are arranged in order from the lower side. A second refrigerant passage F <b> 2 is formed between the drive motor 10 and the inverter device 20, and a first refrigerant passage F <b> 1 is formed between the inverter device 20 and the charging device 30.

  The drive motor 10 includes, for example, a motor unit 12 and a housing 11 that houses the motor unit 12.

  The motor unit 12 is, for example, a stator and a rotor that constitute a permanent magnet synchronous motor or a squirrel-cage induction motor, and generates driving force during vehicle travel by three-phase AC power supplied from the inverter device 20. To do. The output shaft 13 of the motor unit 12 transmits a driving force to a transmission (not shown) or the like disposed outside the housing 11 via a bearing (not shown) provided on the housing 11. To do.

  The casing 11 (corresponding to the “second casing” of the present invention) houses the motor unit 12 in a substantially sealed state. And the housing | casing 11 discharge | releases the heat | fever which generate | occur | produces in the motor part 12 from the said housing | casing 11 through the housing | casing 11 outer peripheral surface. For example, the heat generated in the motor unit 12 is released from the housing 11 to the second refrigerant passage F2 through the upper side wall 11a (corresponding to the “third wall” of the present invention). The shape of the housing 11 is not particularly limited in the present invention. For example, a storage space (corresponding to the “second storage space” of the present invention) is formed by a plurality of wall portions, and the plurality of walls are formed. A rectangular parallelepiped outer shape is exhibited by the part.

  The housing 11 (including the upper side wall portion 11a) is more preferably formed of a material (for example, aluminum material) having good heat transfer characteristics. Further, more preferably, heat dissipating fins projecting into the second refrigerant passage F2 are disposed on the upper side wall portion 11a of the housing 11. With this configuration, heat radiation from the inside of the housing 11 to the second refrigerant passage F2 can be promoted.

  The inverter device 20 includes, for example, an electrical component 22 and a housing 21 that houses the electrical component 22.

  The electrical component 22 (corresponding to the “first electrical component” of the present invention) is an electrical component that constitutes an inverter circuit such as a switching element and a reactor, for example. The electrical component 22 converts DC power received from an in-vehicle battery (not shown) into three-phase AC power and supplies the drive motor 10 with power. The power supply from the electrical component 22 to the drive motor 10 is performed via a power line built in the connection portion L that connects between the housing 21 and the housing 11, for example.

  The casing 21 (corresponding to the “first casing” of the present invention) stores the electrical component 22 in a substantially sealed state in order to protect the electrical component 22 to be stored from surrounding moisture and the like. The shape of the housing 21 is not particularly limited in the present invention. For example, a storage space (corresponding to the “first storage space” of the present invention) is formed by a plurality of wall portions, and the plurality of wall portions are used. Presents a rectangular parallelepiped shape.

  The casing 21 is provided with an electrical component 22 adjacent to the upper side wall portion 21a (corresponding to the “first wall portion” of the present invention), and the heat generated by the electrical component 22 is transferred to the casing 21. It discharges from the inside to the first refrigerant passage F1 through the upper side wall portion 21a. In addition, the upper side wall part 21a of the housing | casing 21 is formed with the material (for example, aluminum material) with a high heat transfer rate from a viewpoint of accelerating the thermal radiation from the inside of the housing | casing 21 to the 1st refrigerant path F1.

  Radiating fins 21af are disposed on the outer surface of the upper side wall portion 21a of the housing 21 so as to protrude into the first refrigerant passage F1 (see FIG. 3). The heat radiating fins 21af exchange heat with the air refrigerant flowing through the first refrigerant passage F1, thereby promoting heat radiation from the electrical component 22 to the first refrigerant passage F1. The shape of the radiating fin 21af is not particularly limited in the present invention. Typically, the radiating fin 21af is a plurality of plate-like protrusions so as to maximize the amount of radiated heat in the entire radiating fin 21af. The shape extends along the direction (arrow Air in FIG. 3) through which the air refrigerant flows in the refrigerant passage F1.

  On the other hand, the lower side wall portion 21b of the casing 21 (corresponding to the “second wall portion” of the present invention) is not provided with heat radiating fins. Then, the heat exchange with the second refrigerant passage F2) is difficult to be performed. That is, the housing 21 has a heat dissipation structure that avoids heat radiation from the lower side wall portion 21b and performs heat radiation from the upper side wall portion 21a. The reason for this heat dissipation structure is that the air in the second refrigerant passage F2 is easily heated by the heat generated from the drive motor 10.

  The charging device 30 includes, for example, an electrical component 32 and a casing 31 that houses the electrical component 32.

  The electrical component 32 (corresponding to the “second electrical component” of the present invention) is, for example, an electricity constituting a charging circuit (for example, an AC / DC conversion circuit and a DC / DC conversion circuit) such as a switching element and a capacitor. It is a part. The electrical component 32 converts power supplied from an external power supply (not shown) to supply power to the on-vehicle battery (not shown).

  The casing 31 (corresponding to the “third casing” of the present invention) stores the electrical component 32 in a substantially sealed state in order to protect the electrical component 32 to be stored from surrounding moisture and the like. The shape of the housing 31 is not particularly limited in the present invention. For example, the housing 31 forms a storage space (corresponding to the “second storage space” of the present invention) by a plurality of wall portions, and the plurality of walls. A rectangular parallelepiped outer shape is exhibited by the part.

  The casing 31 is provided with an electrical component 32 adjacent to the lower side wall portion 31a (corresponding to the “fourth wall portion” of the present invention). And the housing | casing 31 is the 1st refrigerant | coolant channel | path F1 through the downward side wall part 31a from the said housing | casing 31 in the heat | fever which the electrical components 32 (for example, a switching element, a reactor, etc.) generate | occur | produce. To dissipate heat. In addition, the lower side wall part 31a of the housing 31 is formed of a material (for example, an aluminum material) having a high heat transfer rate from the viewpoint of promoting heat radiation from the housing 31 to the first refrigerant passage F1.

  On the outer surface of the lower side wall portion 31a of the housing 31, heat radiating fins 31af are disposed. The heat radiating fins 31af are disposed on the outer surface of the lower side wall portion 31a of the casing 31 so as to protrude into the first refrigerant passage F1. The shape of the heat radiating fin 31af is, for example, a plurality of plate-like protrusions, like the heat radiating fin 21af of the housing 21, and the direction in which the air refrigerant flows through the first refrigerant passage F1 (in FIG. 3). The shape extends along the arrow (Air).

  The inverter device 20 operates mainly during vehicle travel, while the charging device 30 operates mainly during charging when the vehicle is stopped. That is, the inverter device 20 and the charging device 30 are in an exclusive operation relationship, and usually only one of them generates heat. In this way, by adopting a structure in which the inverter device 20 and the charging device 30 are disposed adjacent to each other, the fan 40 can be shared between the two.

  The first refrigerant passage F <b> 1 is a space area provided so that heat can be radiated from the electrical component 22 and the electrical component 32. Air refrigerant flows through the first refrigerant passage F <b> 1 by the operation of the fan 40. The first refrigerant passage F <b> 1 is formed along the outer wall surface of the upper side wall portion 21 a of the housing 21 and the outer wall surface of the lower side wall portion 31 a of the housing 31. In other words, the first refrigerant passage F1 is formed in a space region where the upper side wall portion 21a of the housing 21 and the lower side wall portion 31a of the housing 31 face each other.

  The second refrigerant passage F <b> 2 is a space area provided to suppress heat generated by the motor unit 12 from being transferred to the electrical component 22 and to allow heat dissipation from the motor unit 12. Air refrigerant flows through the second refrigerant passage F <b> 2 by the operation of the fan 40.

  The second refrigerant passage F <b> 2 is formed along the outer wall surface of the upper side wall portion 11 a of the housing 11 and the outer wall surface of the lower side wall portion 21 b of the housing 21. In other words, the second refrigerant passage F2 is formed in a space region where the upper side wall portion 11a of the housing 11 and the lower side wall portion 21b of the housing 21 face each other. However, the second refrigerant passage F2 may be configured not to directly contact the lower side wall portion 21b of the housing 21 and the upper side wall portion 11a of the housing 11.

  The duct 50 connects one end (exit side) of the first refrigerant passage F1 and one end (inlet side) of the second refrigerant passage F2, and flows into the first refrigerant passage F1 by the operation of the fan 40. The refrigerant is circulated through the second refrigerant passage F2. In other words, the inlet of the duct 50 is connected to the air refrigerant outlet of the first refrigerant passage F1, and the outlet of the duct 50 is connected to the air refrigerant inlet of the second refrigerant passage F2.

  The fan 40 allows air refrigerant to flow from one side (inlet side) of the first refrigerant passage F1 to the other side (outlet side) of the second refrigerant passage via the duct 50. The fan 40 according to the present embodiment is disposed on the side opposite to the attachment side of the duct 50 of the first refrigerant passage F1. The fan 40 blows air refrigerant from one side of the first refrigerant passage F1, and passes the air refrigerant through the duct 50 attached to the other side of the first refrigerant passage F1 to the second refrigerant passage F2. Let it flow into.

  The fan 40 is not limited to the blower fan, and may be a suction fan. When a suction fan is used, the fan 40 is provided with an air refrigerant outlet of the second refrigerant passage F2, sucks air refrigerant from one side of the first refrigerant passage F1, and enters the other side of the first refrigerant passage F1. The air refrigerant is passed through the second refrigerant passage F2 through the attached duct 50. Alternatively, when a suction fan is used, the duct 50 is attached to “one side of the first refrigerant passage F1” where the fan 40 is provided, and the air refrigerant sucked from the other side of the first refrigerant passage F1 is supplied to the duct 50. Through the second refrigerant passage F2.

  Moreover, it is good also as a structure which replaces with the fan 40 and makes driving | running | working wind flow as an air refrigerant | coolant at the entrance side of the 1st refrigerant path F1.

  The air refrigerant passed by the fan 40 cools the drive motor 10, the inverter device 20, and the charging device 30, and exhausts heat generated from the drive motor 10 from the second refrigerant passage F2 (details will be described later).

[Vehicle heat dissipation path]
FIG. 4 is a diagram illustrating a heat dissipation path of the vehicle drive device A according to the present embodiment.

  FIG. 4 shows a heat dissipation path in the case where the drive motor 10 is operating by power supply from the inverter device 20. In FIG. 4, an arrow H <b> 1 represents a heat radiation path for heat generated by the electrical component 22, and an arrow H <b> 2 represents a heat radiation path for heat generated by the motor unit 12.

  Since the motor unit 12 generally reaches a high temperature under the restriction of air cooling (for example, about 200 ° C.), a part of the heat generated by the motor unit 12 is a connection portion L between the inverter device 20 and the drive motor 10. Alternatively, heat is also transferred to the adjacent inverter device 20 side through the space (here, the second refrigerant passage F2) (hereinafter, heat transferred from the drive motor 10 to the inverter device 20 side is referred to as “ring heat”. ").

  The vehicle drive device A according to the present embodiment uses an air refrigerant that is passed to cool the electrical component 22 to cool the electrical component 22 in order to suppress the heat generated from the motor unit 12, and the electrical component 22 side from the motor unit 12. Heat to the outside.

  More specifically, in the vehicle drive device A according to the present embodiment, when the motor unit 12 rises to a predetermined threshold temperature, first, the air blowing operation of the fan 40 starts. The operation of the fan 40 is controlled by a controller (not shown) based on a measurement value of a temperature sensor (not shown) disposed around the motor unit 12, for example.

  The air refrigerant blown by the fan 40 exchanges heat with the radiating fins 21af of the casing 21 or the radiating fins 31af of the casing 31 in the first refrigerant passage F1 to cool the electrical component 22 or the electrical component 32. Note that, as described above, only one of the electrical component 22 and the electrical component 32 is normally operated, and one of the electrical components 22 and the electrical component 32 is the object to be cooled by the air refrigerant (in FIG. 4, the electrical components of the inverter device 20). Only 22 is operating).

  The air refrigerant that has reached the other side of the first refrigerant passage F1 reaches the inlet of the second refrigerant passage F2 via the duct 50. And the said air refrigerant | coolant heat-exchanges with the upper side wall part 11a of the housing | casing 11, and cools the motor part 12 in the 2nd refrigerant path F2. Further, the air refrigerant directs the heat generated by the motor unit 12 toward the outlet side of the second refrigerant passage F2, and exhausts it from the second refrigerant passage F2 to the external space.

  Thus, the electrical component 22 and the motor unit 12 can continuously radiate heat by exchanging heat with the air refrigerant.

  As described above, according to the vehicle drive device A according to the present embodiment, the fan 40 and the duct 50 are used to flow the air refrigerant through the first refrigerant passage F1 and cool the electrical component 22 while The air refrigerant can be circulated through the second refrigerant passage F2 to discharge the heat from the motor unit 12 toward the electric component 22 side to the outside. In other words, it is possible to efficiently cool both the electric component 22 and the motor unit 12 while suppressing heat transfer from the motor unit 12 to the electric component 22.

  Further, according to the vehicle drive device A according to the present embodiment, a fan for allowing the air refrigerant to flow through the second refrigerant passage F2 and a fan for cooling the charging device 30 can be omitted. This also leads to reduction of product cost and power consumption.

(Second Embodiment)
FIG. 5 is a diagram illustrating an example of the configuration of the vehicle drive device A according to the second embodiment.

  The vehicle drive device A according to the present embodiment is different from the first embodiment in that the heat radiating fins 50f are arranged on the outer wall surface of the duct 50. Note that description of configurations common to the first embodiment is omitted.

  The heat radiating fins 50 f promote heat radiation from the air refrigerant flowing through the duct 50.

  The material constituting the duct 50 is more preferably a metal material (for example, aluminum) having high thermal conductivity so that heat transfer from the air refrigerant flowing through the duct 50 to the heat radiating fins 50f is facilitated. Material).

  As described above, the air refrigerant also has a role of cooling the motor unit 12 in the second refrigerant passage F2 that flows in after passing through the duct 50. Therefore, the second refrigerant passage is kept as low as possible. It is desirable to flow into F2.

  In this respect, according to the duct 50 according to the present embodiment, the heat radiation fin 50f can be used to radiate heat from the air refrigerant when passing through the duct 50. As a result, the air refrigerant whose temperature has been raised by heat exchange with the electrical component 22 can be brought into a low temperature state and allowed to flow into the second refrigerant passage F2.

(Third embodiment)
Next, with reference to FIGS. 6 to 9, it is a diagram illustrating an example of a configuration of a vehicle drive device A according to a third embodiment. 6 to 9, the illustration of the drive motor 10 is omitted for convenience of explanation.

  In the vehicle drive device A according to the present embodiment, the heat dissipating fins 21af of the housing 21 (hereinafter abbreviated as “lower heat dissipating fins 21af”) are thermally coupled to the housing 31. Similarly, the housing 31 The heat dissipating fin 31af (hereinafter abbreviated as “upper heat dissipating fin 31af”) is also thermally coupled to the housing 21 and is different from the first embodiment.

  FIG. 6 is a side view showing the configuration of the radiation fins 21af and 31af. FIG. 7 is a plan view showing the configuration of the radiation fins 21af and 31af. The right diagram in FIG. 6 is an enlarged view of the area surrounded by the dotted line in the left diagram.

  In the present embodiment, the heat radiation fins 31af of the housing 31 and the heat radiation fins 21af of the housing 21 are alternately arranged, the heat radiation fins 31af of the housing 31 are in contact with the housing 21, and the heat radiation fins 21af of the housing 21 are It is configured to be in contact with the housing 31. As a result, it is possible to dissipate heat generated in the housing 31 or the housing 21 (the electrical component 22 or 32) using both the heat radiation fins 31af of the housing 31 and the heat radiation fins 21af of the housing 21. It is possible to realize good heat radiation characteristics at low cost without using cooling water.

  The upper radiating fin 31af is formed on the outer surface of the casing 31, and the lower radiating fin 21af is formed on the outer surface of the casing 21. The heat radiation fins 21af and 31af integrally dissipate heat generated by the electrical components 22 and 32 to the outside.

  More specifically, the upper radiating fin 31af is formed by a plurality of protrusions formed on the lower surface of the upper casing 31. The protrusion of the heat radiation fin 31af extends to a position where it comes into contact with the upper surface of the housing 21 on the lower side, and is thermally coupled to the housing 21 via the connection portion 31ah.

  Similarly, the lower radiating fin 21af is formed by a plurality of protrusions formed on the upper surface of the lower casing 21. The protrusions of the heat radiating fins 21af extend to a position where they abut against the lower surface of the upper casing 31, and are thermally coupled to the casing 31 via the connecting portions 21ah.

  The protrusions of the upper radiating fins 31af and the protrusions of the lower radiating fins 21af are arranged so as to be alternately combined with each other in a separated state (see FIG. 7). Further, the protrusions of the upper radiating fins 31af and the protrusions of the lower radiating fins 21af both have a plate shape, and are arranged in parallel so that the longitudinal plate surface is along the blowing direction of the fan 40. ing.

  The radiating fins 21af and 31af may have other shapes such as a pin shape instead of the plate shape. However, when the projections of the radiation fins 21af and 31af have other shapes, similarly, it is desirable to arrange them so as to be alternately combined while being separated from each other.

  Both of the heat radiation fins 21af and 31af are integrally formed with the casings 21 and 31 by die casting. As a result, the strength and sealing properties of the casings 21 and 31 are ensured, and the casing 31 and the radiation fins 31af can be integrally molded, and the casing 21 and the radiation fins 21af can be integrally molded. In addition, the manufacturing process for forming the casings 21 and 31 and the heat radiation fins 21af and 31af can be simplified. In addition, the radiation fins 21af and 31af are formed of an aluminum material or the like, similarly to the casings 21 and 31.

  The connection portion 31ah thermally couples the upper radiating fin 31af and the lower casing 21 together. Further, the connection portion 21ah thermally couples the lower radiating fin 21af and the upper casing 31 to each other.

  More specifically, the connection portion 31ah is provided at the tip of the upper radiating fin 31af, and connects the upper radiating fin 31af to the outer surface of the lower casing 21. The connection portion 21ah is provided at the tip of the lower side radiation fin 21af, and connects the lower side radiation fin 21af to the outer surface of the upper case 31. The connection portions 21ah and 31ah connect the members using, for example, solder, welding, a heat radiation adhesive, aluminum brazing, or the like so that heat conduction between the members is performed satisfactorily. As connection parts 21ah and 31ah, a thing with especially high heat conductivity is desirable.

  Note that the connection portions 21ah and 31ah may be configured to connect the radiation fins 31af and the radiation fins 21af instead of the configuration of connecting the tips of the radiation fins 21af and 31af to the outer surfaces of the housings 21 and 31.

[Heat radiation operation of vehicle drive equipment]
The present inventors have intensively studied to realize good heat dissipation characteristics and downsizing, and the electric component 32 and the electric component 22 such as the inverter device 20 and the charging device 30 mounted on the vehicle are always operating at the same time. However, focusing on the fact that the electrical component 32 and the electrical component 22 do not emit the same amount of heat, the inventors have conceived of the heat dissipation structure described above.

  8 and 9 are diagrams for explaining the heat radiation operation of the vehicle drive device A. FIG.

  FIG. 8 is a diagram for explaining an example of the heat radiation operation during vehicle travel. While the vehicle is running, the inverter device 20 operates to supply electric power to the motor, while the electric component 32 of the charging device 30 is not operated. Therefore, only the inverter device 20 is in a state of generating heat.

  The heat generated by the electric component 22 of the inverter device 20 is radiated to the outside through the upper surface of the lower casing 21 and the heat radiation fins 21af. Further, since the lower casing 21 is in a higher temperature than the upper radiating fin 31af, the heat generated by the electric component 22 of the inverter device 20 is simultaneously radiated from the upper side via the connection portion 31ah. It is also transmitted to the fin 31af. In addition, the arrow in FIG. 8 represents the heat flow at this time.

  That is, the heat generated by the electric component 22 of the inverter device 20 is radiated to the outside from both the lower radiating fin 21af and the upper radiating fin 31af. As a result, the surface area for dissipating the heat generated by the electrical component 22 of the inverter device 20 is larger than that in the case of dissipating heat only from the lower heat dissipating fins 21af, and the amount of heat that can be dissipated per unit time is also increased. Become.

  FIG. 9 is a diagram illustrating an example of a heat dissipation operation during charging when the vehicle is stopped. During charging when the vehicle is stopped, the electrical component 32 of the charging device 30 operates, while the electrical component 22 of the inverter device 20 does not operate. Therefore, only the electrical component 32 of the charging device 30 is in a state of generating heat.

  The heat generated by the electrical component 32 of the charging device 30 is radiated to the outside through the lower surface of the upper casing 31 and the radiation fins 31af. Further, since the upper casing 31 is hotter than the lower radiating fins 21af, the heat generated by the electrical components 32 of the charging device 30 is simultaneously radiated to the lower side via the connecting portion 21ah. Also transmitted to the fin 21af. In addition, the arrow in FIG. 9 represents the heat flow at this time.

  That is, the heat generated by the electrical component 32 of the charging device 30 is radiated from both the upper radiating fin 31af and the lower radiating fin 21af. As a result, the surface area for dissipating the heat generated by the electrical component 32 of the charging device 30 is larger than the case where heat is dissipated only from the upper heat dissipating fins 31af, and the amount of heat dissipated per unit time is also increased. Become.

  The above-mentioned effect is mainly due to the connecting portions 21ah and 31ah, and the speed of heat transfer between metals is very high compared to the speed of heat transfer between metal and air. . Therefore, if the connection portions 21ah and 31ah are not provided, a gap is formed between the outer surface of the housing 31 and the heat radiating fins 21af, or between the outer surface of the housing 21 and the heat radiating fins 31af. As a result, the speed at which heat is transferred from the housing 31 to the lower radiating fins 21af or the speed at which heat is transferred from the housing 21 to the upper radiating fins 31af is considerably reduced, and good heat dissipation characteristics are obtained. It will be in an unobtainable state.

  However, the above effect is obtained when the heat generation amounts of the electrical component 22 and the electrical component 32 are different from each other even if the electrical component 22 of the inverter device 20 and the electrical component 32 of the charging device 30 are not combined with each other. If the heat radiation power is different between the heat radiation fins 21af and the heat radiation fins 31af, the heat radiation fins 21af and the heat radiation fins 31af can also be applied to those that generate heat at the same time.

  For example, when the electrical component 22 is an inverter device and the electrical component 32 is a battery, the inverter device and the battery generate heat at the same time, but since the amount of heat generated by the battery is small, the heat generated by the inverter device is radiated upward on the battery side. It is transmitted to the fin 31af. As a result, similarly to the above, the heat generated by the inverter device is radiated from both the upper radiating fins 31af and the lower radiating fins 21af, and good radiating characteristics can be ensured.

  As described above, the heat dissipation structure of the vehicle drive device A according to the present embodiment thermally couples the upper heat dissipating fins 31af and the lower casing 21 via the connection portion 31ah and also connects the connection portion 21ah. The lower radiating fin 21af and the upper casing 31 are thermally coupled to each other. Therefore, the heat generated by the electrical components 22 and 32 is distributed to the radiation fins 21af and the radiation fins 31af, and is radiated from both. As a result, the heat dissipation characteristics of the vehicle drive device A as a whole can be improved.

  Further, according to the heat dissipation structure of the vehicle drive device A according to the present embodiment, at least a part of the protrusion of the upper heat dissipating fin 31af and the protrusion of the lower heat dissipating fin 21af are separated from each other. These are arranged so as to be combined alternately. As a result, the air from the fan 40 can be smoothly passed, and the density of the number of protrusions of the heat radiation fins 21af and 31af can be increased to reduce the size and improve the heat radiation characteristics. In particular, since the radiation fins 21af and 31af according to the present embodiment are formed by die casting, there is a limit to downsizing of the radiation fins and reduction of the fin pitch. In this respect, with the above-described configuration, it is possible to configure a heat dissipation structure that is small and has excellent heat dissipation characteristics.

  In addition, since the heat dissipation structure of the vehicle drive device A according to the present embodiment employs air cooling, cooling equipment such as a cooling water circulation circuit and a circulation pump is unnecessary, and space saving and cost reduction are achieved. You can also.

(Other embodiments)
The present invention is not limited to the above embodiment, and various modifications can be considered.

  In the said embodiment, an example of the thermal radiation structure of the vehicle drive device A was shown variously. However, it is needless to say that various combinations of the modes shown in the embodiments may be used.

  Moreover, in the said embodiment, although the structure attached to the housing | casing 11 was shown as an example of the fan 40, the attachment position of the fan 40 is arbitrary. The fan 40, for example, blows air to another refrigerant passage upstream of the first refrigerant passage F1, and blows air to the first refrigerant passage F1 through the other refrigerant passage. Also good.

  Further, in the above embodiment, as an example of the duct 50, the air refrigerant that flows through the first refrigerant passage F1 is circulated through the second refrigerant passage F2. Only a part of the flowing air refrigerant may be circulated in the second refrigerant passage F2.

  Moreover, in the said embodiment, the aspect which thermally radiates to the 2nd refrigerant | coolant channel | path F2 via the upper side wall part 11a of the housing | casing 11 was shown as an example of the thermal radiation structure of the drive motor 10. FIG. However, in this aspect, there is a possibility that the heat generated from the drive motor 10 to the inverter device 20 also increases. From such a viewpoint, the upper side wall portion 11a of the housing 11 may have a structure in which the motor portion 12 is thermally shielded from the second refrigerant passage F2 using a material having a small heat transfer coefficient.

  Moreover, in the said embodiment, the aspect formed by the upper side wall part 21a of the housing | casing 21, the housing | casing 31, and the lower side wall part 31a was shown as an example of the 1st refrigerant path F1. However, the first refrigerant passage F <b> 1 only needs to be an aspect that can radiate heat from the electrical component 22, and does not necessarily need to be an aspect that can radiate heat from the electrical component 32. For example, the first refrigerant passage F1 may be formed by the upper side wall portion 21a of the casing 21 and the lower side wall portion of the casing that does not particularly have a cooling target.

  Moreover, in the said embodiment, the aspect formed by the lower side wall part 21b of the housing | casing 21, the housing | casing 11, and the upper side wall part 11a was shown as an example of the 2nd refrigerant path F2. However, the second refrigerant passage F <b> 2 only needs to be a mode that can discharge the heat generated from the motor unit 12, and is not necessarily the outer wall surface of the housing 11 and the upper side wall portion 11 a, or the lower side wall portion 21 b of the housing 21. It is not necessary to touch the outer wall surface.

  Moreover, in the said embodiment, the drive motor 10, the inverter apparatus 20, and the charging device 30 were integrally shown as an example of the combination of the apparatus of the vehicle drive device A. FIG. However, the heat dissipation structure described above can be applied to various combinations. For example, the present invention can be applied to a combination of only the drive motor 10 and the inverter device 20. In addition, the power module disposed adjacent to the drive motor 10 may be an in-vehicle battery or the charging device 30.

  Moreover, in the said embodiment, the aspect which laminates | stacks the drive motor 10, the inverter apparatus 20, and the charging device 30 in the up-down direction (Z-axis direction) was shown. In other words, the upper side wall portion 21a of the housing 21 and the lower side wall portion 21b of the housing 21 are disposed at positions facing each other that form the housing 21. However, for example, the drive motor 10 and the inverter device 20 are connected in the left-right direction (X-axis or Y-axis direction) while the inverter device 20 and the charging device 30 are stacked in the vertical direction (Z-axis direction). It is also possible to use this mode. That is, the upper side wall portion 21a of the housing 21 and the lower side wall portion 21b of the housing 21 are arranged so as to face different directions.

  As mentioned above, although the specific example of this invention was demonstrated in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

  According to the vehicle drive device according to the present disclosure, it is possible to realize a more preferable air-cooled heat dissipation structure that can suppress the problem of heat transfer between adjacent devices.

A Vehicle Drive Device L Connection 10 Drive Motor 11 Drive Motor Housing 12 Drive Motor Motor 20 Inverter Device 21 Inverter Device Housing 21af Inverter Device Radiation Fin 21ah Inverter Device Radiation Fin Connection 22 Inverter Device Connection Electrical component 30 Charging device 31 Charging device casing 31af Charging device radiating fin 31ah Charging device radiating fin connection 32 Charging device electric component 40 Fan 50 Duct 50f Duct radiating fin F1 First refrigerant passage F2 Second Refrigerant passage

Claims (10)

A first housing having first and second wall portions facing in different directions forming a first storage space, and storing the first electrical component;
A second housing that houses the motor portion and that is arranged so that a third wall portion that forms a second housing space faces the second wall portion of the first housing;
With respect to the outlet side of the first refrigerant passage formed along the outer wall surface of the first wall of the first casing, the second wall of the first casing and the first wall A duct connecting the inlet side of the second refrigerant passage formed between the third wall of the two housings;
A vehicle drive device comprising: The first casing accommodates the first electrical component so as to be adjacent to the first wall;
The vehicle drive device according to claim 1. A fan that allows air refrigerant to flow from the inlet side of the first refrigerant passage to the outlet side of the second refrigerant passage via the duct;
The vehicle drive device according to claim 1. The duct has radiating fins on the outer wall surface,
The vehicle drive device according to claim 1. The first wall portion of the first housing has a heat radiation fin protruding into the first refrigerant passage.
The vehicle drive device according to claim 1. The first wall portion and the second wall portion of the first casing are wall portions disposed at positions facing each other that form the first storage space.
The vehicle drive device according to claim 1. A fourth wall portion that stores the second electrical component and forms a second storage space is opposed to the first wall portion of the first casing with the first refrigerant passage interposed therebetween. A third housing disposed on
The vehicle drive device according to claim 1. The first wall portion of the first casing has a radiation fin that protrudes into the first refrigerant passage and is thermally coupled to at least a part of the third casing.
The vehicle drive device according to claim 7. The first electrical component of the first housing and the second electrical component of the third housing are electrical components that perform mutually exclusive operations.
The vehicle drive device according to claim 8. The first electrical component of the first housing constitutes an inverter device,
The second electrical component of the third housing constitutes a charging device;
The vehicle drive device according to claim 9.

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