JP2017011949A - Vehicle driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle driving device which enables a bus bur to attain better cooling performance.SOLUTION: A vehicle driving device includes: a motor 10; an inverter 20 which drives the motor 10; a bus bar 30 which electrically connects the motor 10 with the inverter 20; and a cooling mechanism which cools the bus bar 30. The bus bar 30 has: a heat transmission inhibition part which is disposed on the motor 10 side of the bus bar 30 and inhibits heat transmission from the motor 10 to the inverter 20; and a heat radiation facilitation part which is provided on the inverter 20 side of the bus bar 30 to facilitate heat radiation from the bus bar 30. The cooling mechanism includes a cooling fan 41 and an air intake guide 42 which supply cooling air to the bus bar 30.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an improvement of a vehicle drive device.

  2. Description of the Related Art Conventionally, a vehicle drive device that includes a rotating electrical machine such as an electric motor or a generator motor, an inverter that drives the rotating electrical machine, and a bus bar that electrically connects the rotating electrical machine and the inverter is generally known. In such a drive device, the heat generated in the rotating electrical machine is easily transmitted to the inverter via the bus bar, so that the cooling structure of the bus bar is not complicated so that the switching element of the inverter is not overheated. It is desired to improve the cooling performance of the bus bar by oil.

  Therefore, Patent Document 1 includes a cooling liquid supply device that supplies a cooling liquid to the upper part in the vertical direction of the vertical extending part of the bus bar that electrically connects the electric motor and the inverter so as to enhance the cooling performance of the bus bar by the cooling liquid. A drive device is disclosed. In this drive device, one or more through-holes penetrating the vertical extension portion in a direction facing the coolant supply port in the vertical extension portion of the bus bar, and a surface facing the supply port project from the surface. At least one of the one or more convex portions and the one or more concave portions recessed from the surface on the surface facing the supply port is formed.

JP 2011-234590 A

  By the way, in the drive device described in Patent Literature 1, at least one of the through hole, the convex portion, and the concave portion is formed in the vertical extension portion of the bus bar, thereby improving the cooling performance of the bus bar by the coolant. It is possible. However, since the ease of heat transfer from the bus bar is the same as before, the effect of preventing heat transfer from the motor to the inverter cannot be sufficiently obtained. Moreover, since there is little increase in the surface area of a bus bar, it cannot be expected to obtain a sufficient cooling effect.

  This invention is made | formed in view of the said situation, and makes it the problem which should be solved to provide the drive device for vehicles which can obtain the more favorable cooling property of a bus-bar.

The present invention made to solve the above problems
A rotating electrical machine (10), an inverter (20) for driving the rotating electrical machine, a bus bar (30, 30A-30H) for electrically connecting the rotating electrical machine and the inverter, and a cooling mechanism (41) for cooling the bus bar ~ 47, 49), and a vehicle drive device comprising:
The bus bar includes a heat transfer suppression unit (33, 33A to 33H) that suppresses heat transfer from the rotating electrical machine to the inverter, and a heat dissipation promotion unit (35, 33A to 33H) that promotes heat dissipation from the bus bar, It is characterized by having.

  According to this configuration, the bus bar includes the heat transfer suppression unit that suppresses heat transfer from the rotating electrical machine to the inverter, and the heat dissipation promotion unit that promotes heat dissipation from the bus bar. As a result, heat generated in the rotating electrical machine is hardly transmitted to the inverter via the bus bar, so that better cooling performance of the bus bar can be obtained.

It is explanatory drawing which shows typically the structure of the vehicle drive device which concerns on Embodiment 1. FIG. 2 is a perspective view of a bus bar according to Embodiment 1. FIG. 10 is a perspective view of a bus bar according to Modification 1. FIG. It is a perspective view of the bus bar which concerns on the modification 2. FIG. It is a perspective view of the bus bar concerning the modification 3. It is a perspective view of the bus-bar which concerns on the modification 4. FIG. It is a perspective view of a bus bar concerning modification 5. It is a side view of the bus bar which concerns on the modification 5. FIG. It is a perspective view of the bus-bar which concerns on the modification 6. FIG. It is a perspective view of a bus bar concerning modification 7. It is a perspective view of the bus bar concerning the modification 8. It is a side view of the bus bar concerning the modification 8. It is explanatory drawing which shows typically the structure of the vehicle drive device which concerns on Embodiment 2. FIG. It is explanatory drawing which shows typically the structure of the vehicle drive device which concerns on Embodiment 3. FIG.

  Hereinafter, embodiments of a vehicle drive device according to the present invention will be specifically described with reference to the drawings. In addition, this invention is not limited to the following embodiment and modification, It can change variously in the range which does not deviate from the meaning of this invention.

Embodiment 1
The vehicle drive device according to the first embodiment is mounted on a hybrid vehicle, and as shown in FIG. 1, a motor (rotary electric machine) 10, an inverter 20 that drives the motor 10, and the motor 10 and the inverter. 20 are electrically connected to each other, and a cooling fan 41 and an air guide plate 42 are provided as a cooling mechanism for cooling the bus bar 30. In the following description, “one axial side” is the left side of FIG. 1, and “other axial side” is the right side of FIG. 1.

  The motor 10 has a cylindrical housing 11 having a cylindrical portion and a pair of lid plates that close the openings at both ends in the axial direction of the cylindrical portion, and a bearing (not shown) on the lid plate of the housing 11. A rotating shaft 12 rotatably supported via the rotor, a rotor 13 fixed to the outer periphery of the rotating shaft 12, and a stator housed in the housing 11 and disposed radially opposite the rotor. 15. The stator 15 is formed in an annular shape and includes a stator core 16 having a plurality of slits (not shown) arranged in the circumferential direction, and a three-phase (U phase) wound around the slits of the stator core 16. And a stator winding 17 composed of a phase winding of (V phase, W phase). The stator winding 17 has coil ends 17 a that protrude in the axial direction from both axial end surfaces of the stator core 16.

  The inverter 20 is installed on the outer surface of the lid plate portion on the other end side in the axial direction of the housing 11 while being accommodated in the case 21. The inverter 20 includes a control board 22 on which a plurality of arm elements, switching elements, and the like made of insulated gate bipolar transistors (IGBTs) and flywheel diodes are mounted. The inverter 20 uses the voltage of a power source (not shown) as a stator winding based on signals output from a position sensor (not shown) that detects the rotational position of the rotor 13 and a controller (not shown). The motor 10 is driven and controlled by being applied to the 17 three-phase windings.

  The bus bar 30 connects the three-phase windings of the stator winding 17 and the inverter 20, and is formed of a strip made of a conductive material such as copper, iron, or aluminum. FIG. 1 shows only one bus bar 30 corresponding to the U phase among the three phases (U phase, V phase, W phase). An attachment hole 32 a connected to the terminal block 31 fixed to the housing 11 is provided at one end of the bus bar 30, and an attachment hole 32 b connected to the inverter 20 is provided at the other end. One end of the bus bar 30 is connected to each phase winding of the stator winding 17 via the terminal block 31, and the other end is connected to an arm element corresponding to each phase of the inverter 20.

  As shown in FIG. 2, a heat transfer suppression unit 33 that suppresses heat transfer from the motor 10 side to the inverter 20 side is provided on one end side of the bus bar 30 (stator winding 17 side, that is, the motor 10 side). ing. The heat transfer suppression portion 33 is formed by a narrowed portion having a smaller cross-sectional area than the connection end portion of the bus bar 30 on the motor 10 side. In the case of Embodiment 1, the heat-transfer suppression part 33 is provided in one place of the longitudinal direction by forming a pair of notch parts so that it may be bundled from the width direction both sides of the bus-bar 30. By having this heat transfer suppression part 33, the thermal resistance in the one end part side of the bus-bar 30 is raised, and, thereby, the heat transfer from the motor 10 side to the inverter 20 side is suppressed. In addition, you may provide the heat-transfer suppression part 33 in two or more places of a longitudinal direction.

  In addition, a heat radiation promoting portion 35 that promotes heat radiation from the bus bar 30 is provided on the other end side (inverter 20 side) of the bus bar 30. The heat radiation promoting portion 35 is formed of a waved strip having bent portions 36 at two or more locations in the longitudinal direction. In the case of the first embodiment, bent portions 36 bent in a V shape within a range of 30 to 90 degrees are provided at three positions in the longitudinal direction. The heat radiation promoting portion 35 is elongated in the longitudinal direction due to the provision of the bent portion 36, thereby increasing the surface area, thereby promoting heat radiation from the bus bar 30. The heat dissipation promoting part 35 and the heat transfer suppressing part 33 are accommodated in the housing 11.

  The cooling mechanism includes a cooling fan 41 and an air guide plate 42 that supply cooling air to the bus bar 30. The cooling fan 41 is fixed to the outer periphery of the rotating shaft 12 at one end in the axial direction so as to be integrally rotatable with the rotating shaft 12, and is disposed between the cover plate portion at one end in the axial direction of the housing 11 and the rotor 13. . A plurality of inlets 43 through which air is introduced into the housing 11 when the cooling fan 41 rotates is provided in the cover plate portion on one end side in the axial direction of the housing 11. Further, a discharge port 44 for discharging air from the inside of the housing 11 to the outside when the cooling fan 41 rotates is provided at a portion facing the heat radiation promoting portion 35 of the bus bar 30 at the other axial end of the cylindrical portion of the housing 11. Is provided.

  The air guide plate 42 is attached to the inner surface of the lid plate portion on the other end side in the axial direction of the housing 11 so as to guide the air introduced from the inlet port 43 to the outlet port 44 when the cooling fan 41 rotates. Thereby, in the housing 11, the ventilation path | route of the cooling air which flows toward the discharge port 44 from the inlet port 43 at the time of rotation of the cooling fan 41 is formed.

  The drive apparatus according to the first embodiment configured as described above generates heat when the stator winding 17 is energized when the motor 10 is operated by the drive control of the inverter 20. At this time, the cooling fan 41 that rotates integrally with the rotor 13 and the rotating shaft 12 generates cooling air that is introduced into the housing 11 from the introduction port 43 and discharged to the outside through the discharge port 44. Thereby, the bus bar 30 arrange | positioned on the ventilation path | route in the housing 11 is efficiently cooled with cooling air.

  The bus bar 30 according to the first embodiment includes a heat transfer suppression unit 33 that suppresses heat transfer from the motor 10 side to the inverter 20 side, and a heat dissipation promotion unit 35 that promotes heat dissipation from the bus bar 30. Therefore, since heat generated on the motor 10 side (stator winding 17 side) is hardly transmitted to the inverter 20 via the bus bar 30, better cooling performance of the bus bar 30 itself can be obtained.

  As described above, according to the drive device of the first embodiment, the bus bar 30 includes the heat transfer suppression unit 33 and the heat dissipation promotion unit 35, and thus is generated on the motor 10 side (stator winding 17 side). Since it is difficult for the heat thus transmitted to the inverter 20 via the bus bar 30, better cooling performance of the bus bar 30 itself can be obtained. Moreover, since the bus bar 30 has the heat transfer suppressing part 33 on the motor 10 side (stator winding 17 side) and the heat dissipation promoting part 35 on the inverter 20 side, the heat transfer from the motor 10 side to the inverter 20 side. The suppression effect can be exhibited better.

  In the first embodiment, the heat transfer suppression portion 33 is formed by a narrowed portion having a smaller cross-sectional area than the connection end portion of the bus bar 30 on the motor 10 side (stator winding 17 side). The heat transfer suppression part 33 having a function of suppressing heat transfer from the 10 side to the inverter 20 side can be easily formed with a simple and simple structure.

  Moreover, in Embodiment 1, since the heat radiation promotion part 35 is formed with the corrugated strip which has the bending part 36 in three places (two or more places) of a longitudinal direction, it has a function which accelerates | stimulates the heat radiation from the bus-bar 30. The heat dissipation promoting part 35 can be easily formed with a simple and simple structure.

  Moreover, since the bus bar 30 according to the first embodiment can reduce the rigidity, it can absorb the positional deviation during the assembly, so that the stress during the assembly is reduced and the assemblability is improved. Furthermore, since the vibration of the motor 10 is hardly transmitted to the inverter 20, the reliability is improved.

[Modification 1]
The bus bar 30A of Modification 1 shown in FIG. 3 differs from the bus bar 30 of Embodiment 1 only in the heat transfer suppression unit 33A. That is, the heat transfer suppressing portion 33A of the bus bar 30A of the first modification has a first slit 34a extending from one end in the width direction to the front of the other end, and a second slit 34b extending from the other end in the width direction to the front of the one end. They are alternately provided in the direction at a predetermined distance. As a result, the heat transfer suppression portion 33A is formed by a narrowed passage having a cross-sectional area smaller than that of the connection end portion of the bus bar 30A on the motor 10 side and extending in a meandering manner with a substantially constant width from the motor 10 side to the inverter 20 side. Has been. In addition, 35 A of heat radiation promotion parts of the modification 1 are formed with the corrugated strip board similarly to the heat radiation promotion part 35 of Embodiment 1. FIG.

  According to the bus bar 30A of the first modified example, the heat transfer suppressing portion 33A is formed by the narrowed passage having a reduced cross-sectional area as described above, and thus the function of suppressing heat transfer from the motor 10 side to the inverter 20 side. Can be easily formed with a simple and simple structure. In the first modification, two first and second slits 34a and 34b that form the constriction passage of the heat transfer suppressing portion 33A are provided, but the number of each may be changed as appropriate.

[Modification 2]
The bus bar 30B of the second modification shown in FIG. 4 is different from the bus bar 30A of the first modification only in the heat radiation promoting portion 35B. In other words, the heat radiation promoting portion 35B of the bus bar 30B according to Modification 2 is formed of a corrugated strip having bent portions 36 bent in a U shape at two locations in the longitudinal direction. In this case, the heat radiation promoting part 35B is formed in a state where the planar portion overlaps the three layers with a predetermined distance in the thickness direction. Thereby, since the heat radiation promotion part 35B can be made longer in the longitudinal direction than the heat radiation promotion part 35A of the first modification, the surface area can be greatly increased with a compact structure.

[Modification 3]
The bus bar 30C of Modification 3 shown in FIG. 5 is a single layer located on the heat transfer suppression part 33C side in the heat dissipation promotion part 35C formed in a state overlapping with the three layers, similarly to the heat dissipation promotion part 35B of Modification 2. This is different from the bus bar 30B of Modification 2 in that a heat transfer suppression section 33C composed of a narrowed passage extending in a meandering manner similar to the heat transfer suppression section 33B of Modification 2 is provided. . According to the bus bar 30C of the third modification, the length of the entire bus bar 30C in the longitudinal direction can be shortened compared to the bus bar 30B of the second modification, so that a large arrangement space is not required.

[Modification 4]
The bus bar 30D of the modification 4 shown in FIG. 6 has a narrower cross-sectional area than the connection end portion of the bus bar 30D on the motor 10 side, and extends in a meandering manner with a substantially constant width from the motor 10 side to the inverter 20 side. The heat transfer suppressing part 33D formed by the above and the heat radiation promoting part 35D formed of a waved strip having a bent part 36 bent in a V shape at three locations in the longitudinal direction are provided. Common to bus bar 30A. However, the bus bar 30D of the modified example 4 is provided such that the heat transfer suppressing part 33D made of a narrowed passage is overlapped with the end of the heat radiation promoting part 35D on the motor 10 side, so that the bus bar 30A of the modified example 1 is overlapped. And different. According to the bus bar 30D of the fourth modification, the length of the entire bus bar 30D in the longitudinal direction can be shortened with respect to the bus bar 30A of the first modification, so that a large arrangement space is not required.

[Modification 5]
The bus bar 30E of the modification 5 shown in FIGS. 7 and 8 is different from the bus bar 30A of the modification 1 only in the heat radiation promoting part 35E. That is, the heat dissipation promotion part 35E of the modification 5 is longer in the longitudinal direction than the heat dissipation promotion part 35A of the modification 1 which is formed of a wave strip having V-shaped bent parts 36 at three locations in the longitudinal direction. The difference is that three extending slits are provided and two or more types of slits are formed. Specifically, the heat dissipation promoting portion 35E of the modified example 5 is divided into four in the width direction by three slits extending in the longitudinal direction, and is a first divided portion in the corrugated shape that is located at an odd number in the width direction. 37a and the even-numbered corrugated second divided portion 37b are formed in a state of being displaced in the longitudinal direction. That is, the first divided portions 37a and the second divided portions 37b that are displaced in the longitudinal direction are alternately arranged in the width direction.

  According to the bus bar 30E of the modified example 5, since the heat dissipation promoting part 35E is formed by the first and second divided parts 37a and 37b, an offset fin effect can be obtained. The wettability can be improved. The first and second divided portions 37a and 37b constituting the heat radiation promoting portion 35E can be changed to a plurality of shapes, or the positional deviation distance between the adjacent first and second divided portions 37a and 37b. May be changed as appropriate.

[Modification 6]
The bus bar 30F of the modification 6 shown in FIG. 9 differs from the bus bar 30E of the modification 5 only in the heat radiation promoting part 35F. That is, the heat dissipation promoting portion 35E of the modified example 5 is formed in a corrugated plate shape in which the first and second divided portions 37a and 37b have V-shaped bent portions 36 at three locations in the longitudinal direction. The heat dissipation promoting part 35F of Modification 6 is different in that the first and second divided parts 37c and 37d are formed in a corrugated plate shape having U-shaped bent parts 36 at three locations in the longitudinal direction.

  Further, the heat dissipation promoting part 35F of the modification 6 is formed so that the three slits extending in the longitudinal direction are divided into four parts and extend intermittently. That is, the adjacent first and second divided portions 37 c and 37 d are connected to each other at a part of the central portion of the U-shaped bent portion 36. Thereby, the 1st and 2nd division | segmentation part 37c, 37d which comprises the heat dissipation promotion part 35F is integrated so that it may not be separated. Also in the case of the bus bar 30F of the modification 6, the heat dissipation and wettability can be improved in the same manner as the bus bar 30E of the modification 5.

[Modification 7]
The bus bar 30G of the modified example 7 shown in FIG. 10 is different from the bus bar 30A of the modified example 1 only in the heat radiation promoting part 35G. In other words, the heat dissipation promoting portion 35A of the first modification is formed by a single corrugated strip, but the heat dissipation promoting portion 35G of the seventh modification has a plurality of (three in the seventh modified) corrugated strips. The difference is that the plates 38 are laminated in the thickness direction. Each corrugated strip 38 of the modified example 7 is provided with bent portions 36 bent in a V shape in the range of 20 to 45 degrees at six locations in the longitudinal direction. The three corrugated strips 38 are laminated in the thickness direction in a state where the longitudinal intermediate portions are not in contact with each other, and both end portions in the longitudinal direction are joined to each other. In this case, the three corrugated strips 38 are arranged in a state shifted by a predetermined distance in the longitudinal direction.

  According to the bus bar 30G of the modification example 7, since the heat radiation promoting part 35G is formed of a plurality of corrugated strips 38 laminated in the thickness direction, the surface area of the heat radiation promoting part 35G can be greatly increased. Since it can do, the heat dissipation of 35 G of heat dissipation promotion parts can be improved greatly.

[Modification 8]
The bus bar 30H of the modified example 8 shown in FIGS. 11 and 12 is different from the bus bar 30G of the modified example 7 only in the heat radiation promoting part 35H. That is, the heat dissipation promoting portion 35G of the modified example 7 is formed by the three corrugated strips 38, whereas the heat dissipation promoting portion 35H of the modified example 8 is formed by the two corrugated strips 38. Is different. The wavy strip 38 of the modified example 8 is provided with bent portions 36 that are bent in a V shape within a range of 60 degrees to 80 degrees at three locations in the longitudinal direction. The two corrugated strips 38 are configured such that the bent portions 36 located at the center in the longitudinal direction are joined to each other, and the bent portions 36 located on both sides in the longitudinal direction are overlapped with each other in the most separated state. . The two corrugated strips 38 are joined at both ends in the longitudinal direction. In the modified example 8, two corrugated strips 38 are joined at one place in the middle in the longitudinal direction, but may be joined at two or more places.

  According to the bus bar 30H of the modified example 8, as in the modified example 7, the surface area of the heat radiation promoting part 35H can be greatly increased, so that the heat radiation performance of the heat radiation promoting part 35H can be dramatically increased. Moreover, since the two corrugated strips 38 constituting the heat radiation promoting portion 35H are joined at both ends in the longitudinal direction and the bent portions 36 located at the center in the longitudinal direction are joined, heat radiation is promoted. The rigidity of the entire portion 35H can be increased and the shape retention can be improved.

[Embodiment 2]
In the vehicle drive device according to the second embodiment, a cooling mechanism that cools the bus bar 30 with cooling air is employed in the first embodiment, whereas in the second embodiment, the bus bar 30 is cooled with the coolant 49. It differs in that a cooling mechanism is adopted. Therefore, members and configurations that are the same as those in the first embodiment are denoted by the same reference numerals, detailed description thereof is omitted, and different points and important points will be described below.

  As shown in FIG. 13, the vehicle drive device according to the second embodiment includes a motor (rotary electric machine) 10, an inverter 20 that drives the motor 10, a bus bar 30 that electrically connects the motor 10 and the inverter 20, A cooling mechanism for cooling the bus bar 30.

  The motor 10 has the same basic configuration as that of the first embodiment, and has a cylindrical housing 11 whose both ends in the axial direction are closed, and a rotating shaft whose both ends in the axial direction are rotatably supported by the housing 11 via bearings 18. 12, a rotor 13 fixed to the outer periphery of the rotating shaft 12, and a stator 15 accommodated in the housing 11 and disposed radially opposite the rotor. As in the first embodiment, the stator 15 includes a stator core 16 having a plurality of slits (not shown) arranged in the circumferential direction, and a three-phase (U-phase) wound around the slits of the stator core 16. , V-phase, W-phase) stator windings 17 formed of phase windings. The stator winding 17 has coil ends 17 a that protrude in the axial direction from both axial end surfaces of the stator core 16.

  The inverter 20 is installed on the outer surface on the other axial side of the cylindrical portion of the housing 11 while being accommodated in the case 21. As in the first embodiment, the inverter 20 includes a control board 22 on which a plurality of arm elements, switching elements, and the like are mounted. The inverter 20 detects a rotational position of the rotor 13 and a controller (not shown). The motor 10 is driven and controlled by applying a voltage of a power source (not shown) to each of the three phase windings of the stator winding 17 based on a signal output from the not shown.

  The bus bar 30 connects the three-phase windings of the stator winding 17 and the inverter 20, and the same one as in the first embodiment is adopted. That is, as shown in FIG. 2, the bus bar 30 includes a heat transfer suppressing portion 33, a heat radiation promoting portion 35, and mounting holes 32a and 32b. Note that FIG. 13 shows only one bus bar 30 corresponding to the U phase among the three phases (U phase, V phase, W phase). The bus bar 30 is housed in a bus bar housing hole 11 a provided at the other axial end of the cylindrical portion of the housing 11, and one end of each of the stator windings 17 is connected to the stator winding 17 via the terminal block 31. The other end is connected to an arm element corresponding to each phase of the inverter 20. Instead of the bus bar 30, any one of the bus bars 30A to 30H among the modifications 1 to 8 may be adopted.

  The cooling mechanism includes a nozzle 45 that drips the cooling liquid 49 toward the bus bar 30 accommodated in the bus bar accommodating hole 11 a of the housing 11, a pump 46 that conveys the cooling liquid 49 to the nozzle 45, and the recovered cooling liquid 49. And a heat radiator 47 for releasing heat. Further, a discharge port 44 for discharging the coolant 49 dripped from the nozzle 45 from the inside of the housing 11 to the outside is provided at a lower portion of the lid plate portion on the other axial end side of the housing 11. The nozzle 45, the discharge port 44, the pump 46, and the radiator 47 are connected to each other by piping for conveying the coolant, and are installed on the circulation circuit of the coolant 49. In addition, as the cooling liquid 49, well-known things, such as ATF (cooling oil), can be employ | adopted, for example.

  The drive device of the second embodiment configured as described above generates heat when the stator winding 17 is energized when the motor 10 is operated by the drive control of the inverter 20. Further, at the same time as the motor 10 starts operating, the cooling mechanism also starts operating. As a result, the coolant 49 discharged from the pump 46 is transported to the nozzle 45 via the radiator 47 and dropped from the nozzle 45 onto the bus bar 30. The dropped cooling liquid 49 falls while cooling through the bus bar 30, is returned to the pump 46 from the discharge port 44 provided at the bottom of the housing 11, and is then discharged from the pump 46 again to circulate through the circulation circuit. To do. Thereby, the bus bar 30 arranged on the circulation circuit of the coolant 49 is efficiently cooled by the coolant 49.

  As in the first embodiment, the bus bar 30 according to the second embodiment includes a heat transfer suppression unit 33 that suppresses heat transfer from the motor 10 side to the inverter 20 side, and a heat dissipation promotion unit 35 that promotes heat dissipation from the bus bar 30. Have. Therefore, since heat generated on the motor 10 side (stator winding 17 side) is hardly transmitted to the inverter 20 via the bus bar 30, better cooling performance of the bus bar 30 itself can be obtained.

  As described above, according to the drive device of the second embodiment, the bus bar 30 includes the heat transfer suppression unit 33 and the heat dissipation promotion unit 35, and thus is generated on the motor 10 side (stator winding 17 side). Since the heat thus transmitted is less likely to be transmitted to the inverter 20 via the bus bar 30, the same effects and advantages as in the first embodiment can be obtained, such as better cooling performance of the bus bar 30 itself.

[Embodiment 3]
In the vehicle drive device according to the third embodiment, the bus bar 30 is cooled by the coolant 49 as in the second embodiment. However, the bus bar 30 is immersed in the coolant 49 stored in the housing 11. This is different from the second embodiment in that it is cooled. In addition, the structure of the rotor 13 of the motor 10, the stator 15, the inverter 20, and the bus bar 30 of Embodiment 3 is the same as that of Embodiment 1. Therefore, members and configurations common to the first and second embodiments are denoted by the same reference numerals and detailed description thereof is omitted, and different points and important points will be described below.

  As shown in FIG. 14, the housing 11 of the third embodiment is installed in a state where the axial direction is in the horizontal direction, similarly to the first and second embodiments. However, the housing 11 of the third embodiment is not provided with the introduction port 43 and the discharge port 44 provided in the first embodiment, and the bus bar accommodating hole 11a and the discharge port 44 provided in the second embodiment.

  And the bus-bar 30 is arrange | positioned in the lowest part in the housing 11 so that the heat-transfer suppression part 33 and the heat dissipation promotion part 35 may face a horizontal direction. A coolant 49 similar to that used in the second embodiment is stored at the bottom of the housing 11. That is, in the third embodiment, the bottom of the housing 11 itself functions as a coolant pool (oil pan). Thereby, the bus bar 30 is in a state in which the heat transfer suppression unit 33 and the heat dissipation promotion unit 35 are completely immersed in the coolant 49. Further, the lowermost part of the stator winding 17 (coil end 17 a) that becomes a heat source when the motor 10 is operated is also immersed in the coolant 49.

  As described above, according to the driving device of the third embodiment, the bus bar 30 includes the heat transfer suppression unit 33 and the heat dissipation promotion unit 35, and thus is generated on the motor 10 side (stator winding 17 side). Since the heat thus transmitted is less likely to be transmitted to the inverter 20 via the bus bar 30, the same effects and advantages as in the first and second embodiments can be obtained, such as better cooling performance of the bus bar 30 itself.

  DESCRIPTION OF SYMBOLS 10 ... Motor (rotary electric machine) 11 ... Housing 20 ... Inverter 30, 30A-30H ... Bus bar, 33, 33A-33D ... Heat-transfer suppression part, 35, 35A-35H ... Heat radiation promotion part, 36 ... Bending part, 37a, 37c ... 1st division part, 37b, 37d ... 2nd division part, 38 ... Corrugated strip, 41 ... Cooling fan, 42 ... Air guide plate, 43 ... Introduction port, 44 ... Discharge port, 45 ... Nozzle, 46 ... Pump, 47 ... Heat radiator, 49 ... Coolant.

Claims (10)

A rotating electrical machine (10), an inverter (20) for driving the rotating electrical machine, a bus bar (30, 30A-30H) for electrically connecting the rotating electrical machine and the inverter, and a cooling mechanism (41) for cooling the bus bar ~ 47, 49), and a vehicle drive device comprising:
The bus bar includes a heat transfer suppression unit (33, 33A to 33H) that suppresses heat transfer from the rotating electrical machine to the inverter, and a heat dissipation promotion unit (35, 33A to 33H) that promotes heat dissipation from the bus bar, A vehicle drive device comprising:   2. The vehicle drive device according to claim 1, wherein the bus bar includes the heat transfer suppression unit on the rotating electrical machine side and the heat dissipation promotion unit on the inverter side.   3. The vehicle drive device according to claim 1, wherein the heat transfer suppression portion is formed by a narrowed portion having a cross-sectional area smaller than an end portion of the bus bar on the rotating electrical machine side.   The heat transfer suppression portion is formed by a narrowed passage having a cross-sectional area smaller than that of the end portion of the bus bar on the rotating electrical machine side and extending meandering from the rotating electrical machine side to the inverter side. Item 3. The vehicle drive device according to Item 1 or 2.   5. The vehicle drive device according to claim 1, wherein the heat radiation promoting portion is formed of a corrugated strip having bent portions (36) at two or more locations in the longitudinal direction. .   6. The vehicle drive device according to claim 5, wherein the heat radiation promoting portion is divided in a width direction by a slit extending in a longitudinal direction, and includes two or more types of divided portions (37 a to 37 d).   6. The vehicle drive device according to claim 5, wherein the heat radiation promoting portion is formed by laminating a plurality of corrugated strips (38) having different shapes in the thickness direction.   The vehicle drive device according to claim 7, wherein the plurality of corrugated strips are joined at one or more places in the middle in the longitudinal direction. The bus bar is disposed in a housing (11) in which the heat transfer suppressing portion and the heat dissipation promoting portion accommodate the rotating electrical machine,
The vehicle drive according to any one of claims 1 to 8, wherein the cooling mechanism includes a cooling fan (41) for supplying cooling air to the bus bar and an air guide plate (42). apparatus.   In the bus bar, the heat transfer suppressing portion and the heat dissipation promoting portion are disposed in a housing (11) that accommodates the rotating electrical machine, and are immersed in a coolant (49) stored in the housing. The vehicular drive apparatus according to any one of claims 1 to 8, wherein the vehicular drive apparatus is characterized.

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