Vehicle drive device

Abstract

To raise the temperature of oil at an early stage.SOLUTION: The vehicle drive device includes a heat exchanger and a power unit. The power unit includes an oil supply flow path that guides oil from an oil pan of a housing to the heat exchanger, and an oil return flow path that guides oil from the heat exchanger to a coil end. The power unit includes an oil catch component including a disk portion coupled to a rotor shaft and an outer peripheral wall portion continuous with the disk portion and facing an outer peripheral surface of the coil end. The power unit includes a passage component that is provided in the oil supply passage and includes a heat exchange surface that faces an oil ejection hole formed in the oil catch component.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present disclosure relates to a vehicle drive device. [Background technology]

[0002] Vehicles such as automobiles are equipped with power units equipped with electric motors. Such power units have an oil-cooled structure in which the electric motor is cooled by oil in a housing (see Patent Documents 1 to 3). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5908741 [Patent Document 2] Patent No. 6192080 [Patent Document 3] Patent No. 7014126 Summary of the Invention [Problem to be solved by the invention]

[0004] It has been considered to supply oil from a power unit to a heat exchanger to raise the temperature of devices such as a battery pack through the heat exchanger. For example, in an extremely low-temperature environment, it is expected that thermal energy from the power unit to the battery pack through the heat exchanger will actively warm the battery pack and improve its charge / discharge performance. Furthermore, when warming the battery pack, it is necessary to quickly raise the oil temperature of the power unit. [Means for solving the problem]

[0005] According to the present disclosure, a vehicle drive system includes a heat exchanger including a first flow path through which a heat medium is guided and a second flow path through which oil is guided. The vehicle drive system also includes a power unit including a housing connected to the second flow path of the heat exchanger and an electric motor accommodated in the housing. The power unit includes an oil supply flow path connected to an input port of the second flow path and guiding oil from an oil pan of the housing to the second flow path. The power unit includes an oil return flow path connected to an output port of the second flow path and guiding oil from the second flow path to a coil end of the electric motor. The power unit also includes an oil catch component including a disk portion connected to a rotor shaft of the electric motor and an outer circumferential wall portion connected to the disk portion and facing an outer circumferential surface of the coil end. The power unit also includes a flow path component provided in the oil supply flow path and having a heat exchange surface facing an oil injection hole formed in the oil catch component. The oil supplied to the coil end from the oil return passage flows down into the oil catch component that rotates together with the rotor shaft, and is then injected onto the heat exchange surface from the oil injection holes by centrifugal force. [Effects of the Invention]

[0006] According to the present disclosure, the oil temperature can be increased early. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a diagram illustrating an example of a vehicle. [Figure 2] FIG. 2 is a diagram showing an execution state of the battery cooling mode in which the valve element of the switching valve is moved to the cooling position. [Figure 3] FIG. 3 is a diagram showing an execution state of a battery heating mode in which the valve element of the switching valve is moved to the heating position. [Figure 4] FIG. 4 is a diagram illustrating an example of an electric axle. [Figure 5] FIG. 5 is a diagram showing the electric motor provided in the electric axle and its vicinity. [Figure 6] FIG. 6 is a view showing the oil catch disk in the electric axle taken along line VI-VI in FIG. [Figure 7] FIG. 7 is a diagram showing the heat receiving pipe in the electric axle along the line VII-VII in FIG. [Figure 8] FIG. 8 is a diagram showing the oil flow in the electric axle. [Figure 9] FIG. 9 is an image diagram showing an example of the temperature transition of oil flowing through an electric axle. [Figure 10] FIG. 10 is a diagram showing another example of a vehicle drive device. [Figure 11] FIG. 11 is a diagram showing an electric motor and its vicinity provided in an electric axle of another example. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the following description, identical or substantially identical configurations and elements will be designated by the same reference numerals and repeated description will be omitted.

[0009] <Vehicle> FIG. 1 is a diagram showing an example of a vehicle 10. The illustrated vehicle 10 has a vehicle drive system 11 according to one embodiment of the present disclosure. As shown in FIG. 1, the vehicle 10 has an electric axle (power unit) 14 including an electric motor 12 and a differential mechanism 13, and a battery pack 15 electrically connected to the electric axle 14. The differential mechanism 13 of the electric axle 14 is coupled to wheels 17 via axles 16. The battery pack 15 is connected to the electric motor 12 of the electric axle 14 via an inverter 18.

[0010] The vehicle 10 has a temperature regulation system 24 including a radiator 20, a switching valve 21, a heat exchanger 22, and a control unit 23. The radiator 20 and the switching valve 21 are connected to each other via connecting pipes 25a and 25b, and the battery pack 15 and the switching valve 21 are connected to each other via connecting pipes 26a and 26b. The heat exchanger 22 and the switching valve 21 are connected to each other via connecting pipes 27a and 27b, and the heat exchanger 22 and the electric axle 14 are connected to each other via connecting pipes 28a and 28b. A water pump 29 that pumps coolant is provided in the connecting pipe 26a, and an oil pump 30 that pumps oil is provided in the electric axle 14. The control unit 23, which controls the switching valve 21, the water pump 29, the oil pump 30, and the like, is configured by a microcontroller 31 including a processor and memory, a drive circuit unit 32 that generates drive signals, and the like.

[0011] The heat exchanger 22 includes an internal flow path (first flow path) 41 to which the connection pipes 27a and 27b are connected, and an internal flow path (second flow path) 42 to which the connection pipes 28a and 28b are connected. That is, the connection pipe 27a is connected to the input port 41a of the internal flow path 41, and the connection pipe 27b is connected to the output port 41b of the internal flow path 41. The connection pipe 28a is connected to the input port 42a of the internal flow path 42, and the connection pipe 28b is connected to the output port 42b of the internal flow path 42. The connection pipes 25a, 25b, 26a, 26b, 27a, and 27b and the internal flow path 41 are filled with coolant for cooling the battery pack 15. The connection pipes 28a and 28b and the internal flow path 42 are filled with oil supplied from the electric axle 14.

[0012] <Battery cooling mode, battery heating mode> The valve element 21a of the switching valve 21 is operable between a cooling position, which allows the connecting pipes 25a, 25b, 26a, and 26b to communicate with each other, and a heating position, which allows the connecting pipes 26a, 26b, 27a, and 27b to communicate with each other. Fig. 2 illustrates the execution of a battery cooling mode in which the valve element 21a of the switching valve 21 is operated to the cooling position, and Fig. 3 illustrates the execution of a battery heating mode in which the valve element 21a of the switching valve 21 is operated to the heating position. The battery cooling mode, which cools the battery pack 15, is executed, for example, when the temperature of the battery pack 15 exceeds a predetermined upper threshold. The battery heating mode, which warms the battery pack 15, is executed, for example, when the temperature of the battery pack 15 falls below a predetermined lower threshold in an extremely low-temperature environment.

[0013] 2, when the battery cooling mode is executed, the control unit 23 operates the valve element 21a of the switching valve 21 to the cooling position and drives the water pump 29. That is, by operating the valve element 21a of the switching valve 21 to the cooling position, the cooling flow path (heat medium flow path) 15a provided in the battery pack 15 is connected to the internal flow path 41 of the heat exchanger 22 via the connection pipes 26a, 26b, 27a, and 27b. Furthermore, since the water pump 29 is driven, the coolant (heat medium) can be circulated between the battery pack 15 and the radiator 20 as shown by the arrow FL1, and the temperature of the battery pack 15 can be controlled within an appropriate temperature range. The cooling flow path 15a of the battery pack 15 is configured to guide the coolant between the battery cells (not shown) in the battery pack 15 to cool the battery cells. Furthermore, the control unit 23 drives the oil pump 30 of the electric axle 14, and as shown by the arrow FL2, oil circulates between the electric axle 14 and the heat exchanger 22 in the battery cooling mode.

[0014] As shown in FIG. 3 , when the battery heating mode is executed, the control unit 23 operates the valve element 21a of the switching valve 21 to the heating position to drive the water pump 29 and the oil pump 30 of the electric axle 14. As a result, coolant circulates between the battery pack 15 and the heat exchanger 22 as indicated by arrow FL3, and oil circulates between the electric axle 14 and the heat exchanger 22 as indicated by arrow FL2. That is, the coolant flowing through the battery pack 15 is guided to the heat exchanger 22, and oil warmed in the electric axle 14 is guided to the heat exchanger 22. This allows thermal energy to be supplied from the electric axle 14 to the battery pack 15 via the heat exchanger 22, actively warming the battery pack 15 immediately after the vehicle begins traveling in an extremely low-temperature environment and improving charging and discharging performance. Thus, in the battery heating mode, the coolant flowing through the cooling passage 15a of the battery pack 15 functions as a heat medium for warming the battery pack 15.

[0015] <Electric axle> Next, the structure of the electric axle 14 will be described. Fig. 4 is a diagram showing an example of the electric axle 14, and Fig. 5 is a diagram showing the electric motor 12 and its vicinity provided on the electric axle 14. Fig. 6 is a diagram showing the oil catch disc 61 inside the electric axle 14 along line VI-VI in Fig. 4, and Fig. 7 is a diagram showing the heat receiving piping 80 inside the electric axle 14 along line VII-VII in Fig. 4.

[0016] As shown in Fig. 4, the electric axle 14 has a housing 51 equipped with an oil pan 50. The housing 51 accommodates the electric motor 12, a reduction gear train 52, and a differential mechanism 13. The housing 51 also stores oil X used for lubrication and cooling.

[0017] As shown in Fig. 5, the electric motor 12 has a stator 55 consisting of a stator core 53 and a stator coil 54, and a rotor 58 consisting of a rotor core 56 and a permanent magnet 57. The stator 55 has a first coil end 60 of the stator coil 54 protruding from one end surface of the stator core 53, and a second coil end 70 of the stator coil 54 protruding from the other end surface of the stator core 53. A first oil catch disc 61 is disposed near the first coil end 60, and a second oil catch disc 71 is disposed near the second coil end 70. Both oil catch discs (oil catch components) 61, 71 are connected to a hollow rotor shaft 59 provided on the rotor 58.

[0018] <Oil catch disc> 5 and 6 , the first oil catch disc 61 includes a disc portion 62 connected to the rotor shaft 59 and an outer peripheral wall portion 63 connected to the disc portion 62 and facing the outer peripheral surface 60a of the first coil end 60. The first oil catch disc 61 also includes an annular side wall portion 64 connected to the outer peripheral wall portion 63 and facing the disc portion 62. That is, an annular groove 65 consisting of the outer peripheral wall portion 63 and the annular side wall portion 64 is formed inside the outer peripheral wall portion 63 of the first oil catch disc 61. Furthermore, the disc portion 62 of the first oil catch disc 61 is formed with a plurality of oil ejection holes 66 facing the annular side wall portion 64. That is, the oil ejection holes 66 of the first oil catch disc 61 are located radially outward D1 from the outer peripheral surface 60a of the first coil end 60.

[0019] The second oil catch disc 71 has a structure similar to that of the first oil catch disc 61. Specifically, the second oil catch disc 71 includes a disc portion 72 connected to the rotor shaft 59 and an outer peripheral wall portion 73 connected to the disc portion 72 and facing the outer peripheral surface 70a of the second coil end 70. The second oil catch disc 71 also includes an annular side wall portion 74 connected to the outer peripheral wall portion 73 and facing the disc portion 72. Specifically, an annular groove 75 consisting of the outer peripheral wall portion 73 and the annular side wall portion 74 is formed inside the outer peripheral wall portion 73 of the second oil catch disc 71. Furthermore, the disc portion 72 of the second oil catch disc 71 is formed with a plurality of oil ejection holes 76 facing the annular side wall portion 74. Specifically, the oil ejection holes 76 of the second oil catch disc 71 are located radially outward D1 from the outer peripheral surface 70a of the second coil end 70.

[0020] <Heat receiving piping> 5, the electric axle 14 has a first heat receiving pipe (flow path component) 80 arranged near the first oil catch disc 61 and a second heat receiving pipe (flow path component) 90 arranged near the second oil catch disc 71. As shown in FIGS. 5 and 7, the first heat receiving pipe 80 has a heat exchange flow path 81 formed in an annular shape, an input port 81a connected to a distribution pipe 102 described later, and an output port 81b connected to a collecting pipe 103 described later. Similarly, the second heat receiving pipe 90 has a heat exchange flow path 91 formed in an annular shape, an input port 91a connected to the distribution pipe 102, and an output port 91b connected to the collecting pipe 103.

[0021] That is, a common distribution pipe 102 is connected to both the input port 81a of the first heat receiving pipe 80 and the input port 91a of the second heat receiving pipe 90. A common collecting pipe 103 is connected to both the output port 81b of the first heat receiving pipe 80 and the output port 91b of the second heat receiving pipe 90. Furthermore, the first heat receiving pipe 80 formed in an annular shape has a heat exchange surface 82 facing the oil injection holes 66 of the first oil catch disk 61. Similarly, the second heat receiving pipe 90 formed in an annular shape has a heat exchange surface 92 facing the oil injection holes 76 of the second oil catch disk 71.

[0022] <Oil supply passage, oil return passage> As shown in FIG. 4 , the electric axle 14 has an oil supply passage 100 that guides oil from the oil pan 50 toward the heat exchanger 22, and an oil return passage 110 that guides oil from the heat exchanger 22 to the coil ends 60, 70 of the electric motor 12. That is, the oil supply passage 100 is connected to an input port 42a of an internal passage 42 provided in the heat exchanger 22 via a connecting pipe 28a, and the oil return passage 110 is connected to an output port 42b of the internal passage 42 provided in the heat exchanger 22 via a connecting pipe 28b. The oil supply passage 100 is formed by a strainer 101, an oil pump 30, a distribution pipe 102, heat receiving pipes 80, 90, and a collecting pipe 103. The oil return passage 110 is formed by a discharge pipe 111 equipped with nozzles 111a, 111b directed toward the coil ends 60, 70.

[0023] Fig. 8 is a diagram showing the oil flow inside the electric axle 14. As shown in Fig. 8, oil inside the oil pan 50 is sucked into the oil pump 30 from the strainer 101 (arrow a1), and is then supplied from the oil pump 30 to the heat receiving pipes 80, 90 via the distribution pipe 102 (arrow a2). The oil supplied to the heat receiving pipes 80, 90 flows toward the output ports 81b, 91b of the heat receiving pipes 80, 90 (arrow a3), and is then supplied to the heat exchanger 22 from the collecting pipe 103 via the connecting pipe 28a (arrow a4).

[0024] Oil supplied to the heat exchanger 22 flows from the internal flow path 42 through the connecting pipe 28b to the discharge pipe 111 (arrow a5), and is then discharged from the nozzles 111a, 111b of the discharge pipe 111 toward the coil ends 60, 70 (arrow a6). The oil discharged to the coil ends 60, 70 flows down along the coil ends 60, 70 into the annular grooves 65, 75 of the oil catch disks 61, 71 (arrow a7). When the vehicle is running, the electric motor 12 rotates, causing the oil catch disks 61, 71 to rotate along with the rotor shaft 59. Centrifugal force acts on the oil in the annular grooves 65, 75, causing the oil to be sprayed from the oil spray holes 66, 76 onto the heat exchange surfaces 82, 92 (arrow a8). The oil sprayed onto the heat exchange surfaces 82, 92 then warms the heat exchange surfaces 82, 92 and flows down into the oil pan 50 below (arrow a9).

[0025] <Oil temperature transition in an extremely low temperature environment> FIG. 9 is an image diagram showing an example of the temperature change of the oil flowing through the electric axle 14. In FIG. 9, the oil temperature change when the oil catch discs 61, 71 are provided is shown by a solid line L1, and the oil temperature change when the oil catch discs 61, 71 are not provided is shown by a dashed-dotted line L2. FIG. 9 also shows the oil temperature change immediately after the vehicle starts traveling in an extremely low-temperature environment. In FIG. 9, P1 indicates the position of the oil pan 50, P2 indicates the position of the oil pump 30, P3 indicates the position of the heat-receiving pipes 80, 90, P4 indicates the position of the heat exchanger 22, and P5 indicates the position of the coil ends 60, 70.

[0026] 8 , oil supplied to the coil ends 60, 70 of the stator 55 is sprayed from the oil injection holes 66, 76 of the oil catch disks 61, 71 onto the heat receiving pipes 80, 90 (arrow a8). In other words, the oil that has been warmed by passing through the coil ends 60, 70 is sprayed onto the heat exchange surfaces 82, 92 of the heat receiving pipes 80, 90, thereby warming the oil in the heat exchange passages 81, 91 via the heat exchange surfaces 82, 92. In other words, at least a portion of the oil warmed by the coil ends 60, 70 is collected and sprayed onto the heat receiving pipes 80, 90 before flowing down into the extremely low-temperature oil pan 50, so that the oil heading from the electric axle 14 to the heat exchanger 22 can be actively heated.

[0027] Here, when a structure is provided in which oil is injected from the oil catch disks 61, 71 into the heat receiving pipes 80, 90, the temperature of the oil passing through the heat receiving pipes 80, 90 can be increased (symbol α) as shown by the solid line L1 in FIG. 9 . This increases the temperature of the oil flowing from the electric axle 14 to the heat exchanger 22, allowing the battery pack 15 to be quickly warmed when the battery heating mode is executed. In contrast, when a structure is not provided with the oil catch disks 61, 71, it is extremely difficult to increase the temperature of the oil passing through the heat receiving pipes 80, 90 as shown by the dashed-dotted line L2 in FIG. 9 (symbol β). Thus, when a structure is not provided with the oil catch disks 61, 71, it is difficult to quickly increase the temperature of the oil flowing toward the heat exchanger 22. However, according to the technology of the present disclosure, the temperature of the oil flowing toward the heat exchanger 22 can be quickly increased as shown by the solid line L1 in FIG. 9 .

[0028] <Variation 1> 2 and 3, the battery pack 15 is connected to the heat exchanger 22 via the switching valve 21, but this is not limiting, and a device to be heated other than the battery pack 15 may be connected to the heat exchanger 22. Here, FIG. 10 is a diagram showing another example of a vehicle drive device 120. In FIG. 10, configurations and elements similar to those shown in FIG. 3 are denoted by the same reference numerals, and descriptions thereof will be omitted.

[0029] As shown in FIG. 10 , the vehicle drive system 120 has an air conditioning device 123 including a heater core 121 and a blower 122. The internal flow path 41 of the heat exchanger 22 and the internal flow path 124 of the heater core 121 are connected to each other via connecting pipes 125a and 125b. The connecting pipe 125a is provided with a circulation pump 126 that pumps a circulating fluid (heat medium). By driving the circulation pump 126 and the oil pump 30, the circulating fluid is circulated between the heater core 121 and the heat exchanger 22 as shown by arrow FL4, and the oil is circulated between the electric axle 14 and the heat exchanger 22 as shown by arrow FL5. That is, the circulating fluid flowing through the heater core 121 is guided to the heat exchanger 22, and the oil warmed in the electric axle 14 is guided to the heat exchanger 22. This allows thermal energy to be supplied from the electric axle 14 to the heater core 121 via the heat exchanger 22, making it possible to actively warm up the heater core 121 immediately after the vehicle starts running in an extremely low temperature environment.

[0030] <Variation 2> In the example shown in Figure 8, oil ejection holes 66, 76 are formed in the disk portions 62, 72 of the oil catch disks 61, 71, but this is not limited thereto, and oil ejection holes may be formed in the outer peripheral wall portions 63, 73 of the oil catch disks 61, 71. Here, Figure 11 is a diagram showing the electric motor 12 and its vicinity provided in an electric axle 170 of another example. In Figure 11, configurations and elements similar to those shown in Figure 8 are assigned the same reference numerals, and descriptions thereof will be omitted.

[0031] As shown in FIG. 11 , a first oil catch disk (oil catch component) 130 is disposed near the first coil end 60, and a second oil catch disk (oil catch component) 140 is disposed near the second coil end 70. Both oil catch disks 130, 140 include disk portions 62, 72, outer peripheral wall portions 63, 73, and annular side wall portions 64, 74. Furthermore, a plurality of oil ejection holes 131, 141 are formed in the outer peripheral wall portions 63, 73 of the oil catch disks 130, 140. These oil ejection holes 131, 141 are located radially outward D1 from the outer peripheral surfaces 60 a, 70 a of the coil ends 60, 70. The electric axle 14 also includes a first heat receiving pipe (flow path component) 150 disposed surrounding the first oil catch disk 130, and a second heat receiving pipe (flow path component) 160 disposed surrounding the second oil catch disk 140. Both heat receiving pipes 150, 160 have heat exchange surfaces 151, 161 facing the outer peripheral wall portions 63, 73 of the oil catch disks 130, 140, that is, the heat exchange surfaces 151, 161 facing the oil injection holes 131, 141.

[0032] In this way, even when the oil ejection holes 131, 141 are formed in the outer peripheral wall portions 63, 73 of the oil catch disks 130, 140, oil can be sprayed from the oil ejection holes 131, 141 onto the heat exchange surfaces 151, 161. This allows the oil traveling from the electric axle 14 to the heat exchanger 22 to be actively warmed. In other words, the oil supplied to the coil ends 60, 70 flows down from the coil ends 60, 70 into the annular grooves 65, 75 of the oil catch disks 130, 140 below (arrow a7). Furthermore, because centrifugal force acts on the oil in the annular grooves 65, 75, the oil is ejected from the oil ejection holes 131, 141 toward the heat exchange surfaces 151, 161 of the heat receiving pipes 150, 160 (arrow a8). The oil ejected onto the heat exchange surfaces 151, 161 then warms the heat exchange surfaces 151, 161 before flowing down into the oil pan 50 below (arrow a9). In this way, at least a portion of the oil warmed by the coil ends 60, 70 is recovered before flowing down into the extremely low temperature oil pan 50 and sprayed onto the heat receiving pipes 150, 160, so that the oil heading towards the heat exchanger 22 can be actively warmed.

[0033] <Other variations> The present disclosure is not limited to the above-described embodiment and may be modified in various ways without departing from the spirit and scope of the present disclosure. In the illustrated example, an electric axle 14 is used as the power unit, but this is not limited thereto and a power unit including an engine and an electric motor as a power source may also be used. In the illustrated example, the electric axle 14 is provided with two oil catch discs 61, 71 and two heat receiving pipes 80, 90, but this is not limited thereto. For example, the electric axle 14 may be provided with one oil catch disc 61 and one heat receiving pipe 80. Furthermore, while the illustrated oil pump 30 is an electric oil pump driven by an electric motor, this is not limited thereto and the oil pump may be driven by a rotating shaft such as the rotor shaft 59.

[0034] In the illustrated example, the heat receiving pipes 80, 90 are formed in an annular shape, but this is not a limitation and the heat receiving pipes 80, 90 may be formed in an arc or linear shape. In other words, the heat receiving pipes 80, 90 may be formed in any shape as long as they have a heat exchange surface 82, 92 facing the oil injection holes 66, 76. In the illustrated example, the entire oil injection hole 66 is located radially outward D1 from the outer peripheral surface 60a of the coil end 60, but this is not a limitation and it is sufficient that at least a portion of the oil injection hole 66 is located radially outward D1 from the outer peripheral surface 60a. Similarly, in the illustrated example, the entire oil injection hole 76 is located radially outward D1 from the outer peripheral surface 70a of the coil end 70, but this is not a limitation and it is sufficient that at least a portion of the oil injection hole 76 is located radially outward D1 from the outer peripheral surface 70a. [Explanation of symbols]

[0035] 11...vehicle drive device, 12...electric motor, 14...electric axle (power unit), 15...battery pack, 15a...cooling flow path (heat medium flow path), 22...heat exchanger, 41...internal flow path (first flow path), 42...internal flow path (second flow path), 42a...input port, 42b...output port, 50...oil pan, 51...housing, 60...first coil end (coil end), 60a...outer peripheral surface, 61...first oil catch disc (oil catch component), 62...disc portion, 63...outer peripheral wall portion, 66...oil injection hole, 70...second coil end (coil end), 70a...outer peripheral surface, 71...second oil catch disc (oil oil catch disc (oil catch component), 72...disc portion, 73...outer peripheral wall portion, 76...oil injection hole, 80...first heat receiving pipe (flow path component), 82...heat exchange surface, 90...second heat receiving pipe (flow path component), 92...heat exchange surface, 100...oil supply passage, 110...oil return passage, 120...vehicle drive device, 130...first oil catch disc (oil catch component), 131...oil injection hole, 140...second oil catch disc (oil catch component), 141...oil injection hole, 150...first heat receiving pipe (flow path component), 151...heat exchange surface, 160...second heat receiving pipe (flow path component), 161...heat exchange surface, 170...electric axle, D1...radially outer

Claims

1. a heat exchanger including a first flow path through which a heat medium is guided and a second flow path through which oil is guided; a power unit including a housing connected to the second flow path of the heat exchanger and an electric motor accommodated in the housing; and The power unit is an oil supply passage connected to an input port of the second passage and configured to guide oil from an oil pan of the housing to the second passage; an oil return passage connected to an output port of the second passage and guiding oil from the second passage to a coil end of the electric motor; an oil catch component including a disk portion connected to a rotor shaft of the electric motor and an outer circumferential wall portion connected to the disk portion and facing an outer circumferential surface of the coil end; a flow path component provided in the oil supply flow path and including a heat exchange surface facing the oil injection hole formed in the oil catch component; Equipped with The oil supplied from the oil return passage to the coil end flows down into the oil catch component that rotates together with the rotor shaft, and is then injected onto the heat exchange surface from the oil injection hole by centrifugal force. Vehicle drive unit.

2. 2. The vehicle drive system according to claim 1, a heat medium flow path of a battery pack is connected to the first flow path of the heat exchanger; Vehicle drive unit.

3. 2. The vehicle drive system according to claim 1, The heat exchange surface is formed in an annular shape. Vehicle drive unit.

4. 2. The vehicle drive system according to claim 1, The oil injection hole is formed in the disk portion. Vehicle drive unit.

5. 5. The vehicle drive system according to claim 4, The oil ejection hole is located radially outward from the outer circumferential surface of the coil end. Vehicle drive unit.

Images