Motor generator cooling structure

Abstract

To reliably cool the power line of a motor generator.SOLUTION: A transaxle 20 has a second motor generator 62 and an injection device 30. The second motor generator 62 includes a stator 72, a rotor 71, a U-phase power line 76U, and a terminal block 79. A first end of the U-phase power line 76U is connected to a coil 74 of the stator 72 and a second end of the U-phase power line 76U is connected to the terminal block 79. The injection device 30 includes a second injection hole 32 for injecting oil into the U-phase power line 76U, etc. The second motor generator 62 includes a plate-like first extended portion 77A protruding from a horizontal portion 76UA of the U-phase power line 76U. A virtual line passing through the center of the second injection hole 32 is defined as a second oil injection line 32A. One of two main surfaces of the first extended portion 77A faces the second injection hole 32 side and intersects with the second oil injection line 32A.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a cooling structure for a motor generator. [Background technology]

[0002] The cooling structure of the motor generator in Patent Document 1 includes a motor generator and an injection device. The motor generator includes a rotor, a stator, three power lines, a terminal block, and a molded section. The stator is substantially cylindrical. The stator includes a coil. The rotor is located inside the stator. A first end of each power line is connected to the coil of the stator. A second end of each power line is connected to the terminal block. That is, the three power lines are wiring for supplying power to the coil. The molded section covers the entire area of ​​the three power lines. The injection device injects oil into the molded section. The molded section is cooled by the oil. The cooled molded section also cools each power line. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2008-312324 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the cooling structure of a motor generator as disclosed in Patent Document 1, in order to improve the cooling efficiency of the power line, it is conceivable to expose the power line from the molded portion and supply oil injected from the injector directly to the power line. However, in order to achieve the expected cooling efficiency in such a configuration, it is necessary to inject oil from the injector in a precise direction toward the power line. However, due to installation errors of the injector and the power line, it is difficult to ensure that the oil hits the power line. [Means for solving the problem]

[0005] A cooling structure for a motor generator to solve the above problem includes a stator including a cylindrical stator core and a coil attached to the stator core, a rotor located inside the stator when viewed from the stator, a power line having a first end connected to the coil for supplying power to the coil, a terminal block connected to a second end of the power line, and an injection device having an injection hole for injecting oil into the power line, and further includes a plate-shaped extension portion protruding from the power line, and when a virtual line passing through the center of the injection hole is defined as an oil injection line, one of the two main surfaces of the extension portion faces the side of the injection hole and intersects the oil injection line.

[0006] According to the above configuration, the oil injected from the injection device is likely to hit the extension part. If the extension part is cooled by heat exchange with the oil, the power line connected to the extension part can also be cooled. As a result, even if the oil injected from the injection device is unlikely to hit the power line directly, the power line can be cooled more reliably.

[0007] In the above configuration, when the power line is a first power line and the coil is a first coil, the stator includes a second coil attached to the stator core, and is equipped with a second power line having a first end connected to the second coil and a second end connected to the terminal block, and when the vertical direction of the vehicle when the cooling structure is mounted on the vehicle is used as a reference, the cooling structure may further include a guide portion protruding downward from at least one of the first power line and the extension portion, and a portion of the second power line may be located below the guide portion.

[0008] According to the above configuration, the oil supplied to the first power line and the extension portion is easily supplied to the second power line via the guide portion, and as a result, the second power line can be efficiently cooled by heat exchange with the oil supplied from the guide portion to the second power line. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic configuration diagram of a vehicle. [Diagram 2] FIG. 2 is a partial cross-sectional view of the transaxle. [Diagram 3] FIG. 3 is a partial cross-sectional view taken along line 3-3 in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] <Vehicle mechanical configuration> Hereinafter, one embodiment of the present invention will be described with reference to Figures 1 to 3. First, a schematic configuration of a vehicle 100 will be described.

[0011] 1, vehicle 100 includes an internal combustion engine 10, a transaxle 20, and a plurality of drive wheels 69 as a path through which power is transmitted. Transaxle 20 includes a case 35, a first planetary gear mechanism 40, a second planetary gear mechanism 50, a first motor generator 61, a second motor generator 62, a reduction mechanism 66, and a differential 67. In other words, transaxle 20 is a so-called hybrid transaxle.

[0012] The internal combustion engine 10 includes a crankshaft 11 as an output shaft. The crankshaft 11 is connected to a first planetary gear mechanism 40. The first planetary gear mechanism 40 includes a sun gear 41, a carrier 42, a plurality of pinion gears 43, a ring gear 44, and a ring gear shaft 45. The sun gear 41, which is an external gear, and the ring gear 44, which is an internal gear, are positioned coaxially. The sun gear 41 is connected to the ring gear 44 via the plurality of pinion gears 43. The carrier 42 supports the pinion gear 43 in a rotatable state. The carrier 42 also supports the pinion gear 43 so that it can revolve. That is, the pinion gear 43 revolves with the rotation of the carrier 42. The carrier 42 is connected to the crankshaft 11. The sun gear 41 is connected to a first motor generator 61.

[0013] The first motor generator 61 includes a rotor 61A and a stator 61B. The rotor 61A is rotatable relative to the stator 61B. The rotor 61A is connected to the sun gear 41. An example of the first motor generator 61 is a three-phase synchronous motor generator.

[0014] When the torque of the internal combustion engine 10 is input to the carrier 42, the torque of the internal combustion engine 10 is distributed to the sun gear 41 side and the ring gear 44 side. Then, when the torque of the internal combustion engine 10 transmitted via the sun gear 41 is input to the rotor 61A of the first motor generator 61, the first motor generator 61 functions as a generator.

[0015] On the other hand, when the first motor generator 61 functions as an electric motor, the rotor 61A rotates relative to the stator 61B, and the torque of the first motor generator 61 is input to the sun gear 41. Then, the torque of the first motor generator 61 input to the sun gear 41 is distributed to the carrier 42 side and the ring gear 44 side. Then, when the torque of the first motor generator 61 transmitted via the carrier 42 is input to the crankshaft 11 of the internal combustion engine 10, the crankshaft 11 of the internal combustion engine 10 rotates.

[0016] The ring gear 44 is connected to a ring gear shaft 45. The ring gear shaft 45 rotates integrally with the ring gear 44. The ring gear shaft 45 is connected to a reduction mechanism 66. The reduction mechanism 66 is, for example, a reduction gear mechanism. The reduction mechanism 66 is connected to drive wheels 69 via a differential 67. The differential 67 allows a difference in rotational speed to occur between the left and right drive wheels 69.

[0017] The ring gear shaft 45 is connected to the second planetary gear mechanism 50. The second planetary gear mechanism 50 includes a sun gear 51, a carrier 52, a plurality of pinion gears 53, and a ring gear 54. The sun gear 51, which is an external gear, and the ring gear 54, which is an internal gear, are positioned coaxially. The sun gear 51 is connected to the ring gear 54 via the plurality of pinion gears 53. The carrier 52 supports the pinion gear 53 in a state in which the pinion gear 53 can rotate. The carrier 52 is fixed to the case 35. That is, the carrier 52 cannot rotate, and the pinion gear 53 cannot revolve due to the carrier 52. The ring gear 54 is connected to the ring gear shaft 45. The sun gear 51 is connected to the second motor generator 62.

[0018] The second motor generator 62 includes a rotor 71 and a stator 72. The rotor 71 is rotatable relative to the stator 72. The rotor 71 is connected to the sun gear 51. An example of the second motor generator 62 is a three-phase synchronous motor generator. A specific peripheral configuration of the second motor generator 62 will be described later.

[0019] The second motor generator 62 functions as a generator when decelerating the vehicle 100, thereby making it possible to generate a regenerative braking force in the vehicle 100 according to the amount of power generated by the second motor generator 62.

[0020] On the other hand, when the second motor generator 62 functions as an electric motor, the rotor 71 rotates relative to the stator 72. The torque of the second motor generator 62 is input to the drive wheels 69 via the second planetary gear mechanism 50, the ring gear shaft 45, the reduction mechanism 66, and the differential 67. Then, the torque of the second motor generator 62 rotates the drive wheels 69.

[0021] As shown in FIG. 1, vehicle 100 includes a supply passage 86, an oil pump 87, an oil pan 88, and a discharge passage 89 as mechanisms for supplying oil. Oil pan 88 stores oil. Oil pump 87 is mechanically connected to differential 67 and is driven by torque transmitted from differential 67. In other words, oil pump 87 is a so-called mechanical oil pump. Oil pump 87 supplies oil stored in oil pan 88 to various parts of transaxle 20 via supply passage 86. Furthermore, discharge passage 89 returns oil that has circulated through various parts of transaxle 20 to oil pan 88.

[0022] The vehicle 100 includes a first inverter 81, a second inverter 82, and a battery 83 as devices for transferring electric power. The first inverter 81 adjusts the amount of electric power transferred between the first motor generator 61 and the battery 83. The second inverter 82 adjusts the amount of electric power transferred between the second motor generator 62 and the battery 83.

[0023] The vehicle 100 is equipped with a control device 90. The control device 90 controls the internal combustion engine 10 by outputting a control signal to the internal combustion engine 10. The control device 90 controls the first motor generator 61 via the first inverter 81 by outputting a control signal to the first inverter 81. The control device 90 controls the second motor generator 62 via the second inverter 82 by outputting a control signal to the second inverter 82.

[0024] <Cooling structure> Next, a cooling structure for cooling the second motor generator 62 will be described. The following description will be based on the top and bottom, front and rear, and left and right of the vehicle 100 when the transaxle 20 is mounted on the vehicle 100. Note that the cooling structure of the first motor generator 61 is similar to the cooling structure of the second motor generator 62, so a description thereof will be omitted. First, a specific configuration of the second motor generator 62 will be described.

[0025] 2, the stator 72 includes a stator core 73 and a coil 74. The shape of the stator core 73 is generally cylindrical. In this embodiment, the central axis of the stator core 73 extends to the left and right of the vehicle 100. The stator core 73 is fixed to the case 35 via a case of the second motor generator 62 (not shown) and the like.

[0026] Coils 74 are fixed to the inner circumferential surface of stator core 73. Coils 74 include a U-phase coil, a V-phase coil, and a W-phase coil. The U-phase coil, the V-phase coil, and the W-phase coil of coils 74 are alternately arranged in the circumferential direction of stator core 73. The U-phase coil, the V-phase coil, and the W-phase coil of coils 74 protrude from an end face of stator core 73. Note that in FIG. 2, the coils of each phase are simplified, and coils 74 as a whole are illustrated as being substantially cylindrical.

[0027] The rotor 71 is located inside the stator 72 when viewed from the stator 72. That is, the second motor generator 62 is an inner rotor type motor generator. The rotor 71 has a substantially cylindrical shape.

[0028] As shown in Fig. 3, the second motor generator 62 includes, in addition to the rotor 71 and the stator 72 described above, a U-phase power line 76U, a V-phase power line 76V, a W-phase power line 76W, and a terminal block 79. The terminal block 79 is fixed to the case 35. The terminal block 79 penetrates a wall portion located on the left side of the case 35. As shown in Fig. 2, the terminal block 79 is located above the central axis of the stator core 73. The terminal block 79 is also located rearward from the central axis of the stator core 73.

[0029] As shown in Figs. 2 and 3, the U-phase power line 76U has a band-like shape as a whole. A first end of the U-phase power line 76U is connected to the U-phase coil of the coil 74. A second end of the U-phase power line 76U is connected to the terminal block 79. The U-phase power line 76U extends while repeatedly bending along the way. As a result, the U-phase power line 76U has a horizontal portion 76UA that extends to the front and rear of the vehicle 100. One of the two main surfaces of the horizontal portion 76UA faces upward. The two main surfaces refer to the plane with the largest area among the outer surfaces of the plate-like object and the plane opposite to that plane.

[0030] The V-phase power line 76V has a belt-like shape as a whole. A first end of the V-phase power line 76V is connected to the V-phase coil of the coil 74. A second end of the V-phase power line 76V is connected to the terminal block 79. The V-phase power line 76V extends while repeatedly bending along the way. As a result, the V-phase power line 76V has a horizontal portion 76VA that extends to the front and rear of the vehicle 100. One of the two main surfaces of the horizontal portion 76VA faces upward. The horizontal portion 76VA of the V-phase power line 76V is located below the horizontal portion 76UA of the U-phase power line 76U.

[0031] The W-phase power line 76W has a belt-like shape as a whole. A first end of the W-phase power line 76W is connected to the W-phase coil of the coil 74. A second end of the W-phase power line 76W is connected to the terminal block 79. The W-phase power line 76W extends while repeatedly bending along the way. As a result, the W-phase power line 76W has a horizontal portion 76WA extending from the front to the rear of the vehicle 100. One of the two main surfaces of the horizontal portion 76WA faces upward. The horizontal portion 76WA of the W-phase power line 76W is located below the horizontal portion 76UA of the U-phase power line 76U. The horizontal portion 76WA of the W-phase power line 76W is also located below the horizontal portion 76VA of the V-phase power line 76V.

[0032] As shown in Fig. 2, the transaxle 20 includes an injector 30. The shape of the injector 30 is substantially cylindrical. The central axis of the injector 30 extends to the left and right of the vehicle 100. The injector 30 is located above the stator 72 of the second motor generator 62. The injector 30 is also located above the horizontal portion 76UA of the U-phase power line 76U. Oil is supplied to the injector 30 from an oil pump 87 via a supply passage 86.

[0033] The injector 30 includes a plurality of first injection holes 31 and a plurality of second injection holes 32. The first injection holes 31 penetrate the wall of the injector 30. The plurality of first injection holes 31 are aligned along the central axis of the injector 30. The first injection holes 31 face downward. Here, a virtual line passing through the center of the first injection hole 31 is defined as a first oil injection line 31A. As shown in FIG. 2, when viewed from the direction along the central axis of the injector 30, the first oil injection line 31A intersects with the stator 72 of the second motor generator 62. Therefore, the injector 30 injects the oil supplied to the injector 30 from the plurality of first injection holes 31 toward the stator 72 of the second motor generator 62.

[0034] The imaginary line passing through the center of the injection hole is defined as follows: the injection hole is viewed in a planar direction in which the opening area of ​​the injection hole is largest. The geometric center of the injection hole is identified in the planar view. The imaginary line that is parallel to the planar view direction and passes through the geometric center is defined as the imaginary line passing through the center of the injection hole.

[0035] The second injection hole 32 penetrates the wall of the injector 30. The second injection holes 32 are aligned along the central axis of the injector 30. The second injection holes 32 face downward and toward the rear. Here, a virtual line passing through the center of the second injection hole 32 is defined as a second oil injection line 32A. As shown in FIG. 2, when viewed from a direction along the central axis of the injector 30, the second oil injection line 32A is inclined with respect to both the axis extending vertically and the axis extending forward and backward. In addition, the second oil injection line 32A intersects with a horizontal portion 76UA of the U-phase power line 76U in the second motor generator 62. Therefore, the injector 30 injects oil supplied to the injector 30 from the second injection holes 32 toward the U-phase power line 76U, the V-phase power line 76V, and the W-phase power line 76W in the second motor generator 62.

[0036] As shown in FIG. 3, the second motor generator 62 includes a first extension portion 77A and a second extension portion 77B. The first extension portion 77A protrudes rightward from the right edge of the horizontal portion 76UA of the U-phase power line 76U. As shown in FIG. 2, when viewed from the direction along the central axis of the injector 30, the first extension portion 77A protrudes from the intersection of the U-phase power line 76U and the second oil injection line 32A. As shown in FIG. 3, the protruding tip of the first extension portion 77A is located above the horizontal portion 76VA of the V-phase power line 76V. The shape of the first extension portion 77A is a substantially square plate shape. One of the two main surfaces of the first extension portion 77A faces upward. Here, the injector 30 is located above the first extension portion 77A. 2, when viewed from the direction along the central axis of the injector 30, one of the two main surfaces of the first extension portion 77A intersects with the second oil injection line 32A. Therefore, as shown in FIG. 2, one of the two main surfaces of the first extension portion 77A faces the second injection hole 32 of the injector 30 and intersects with the second oil injection line 32A. The second extension portion 77B protrudes leftward from the left edge of the horizontal portion 76UA of the U-phase power line 76U. The second extension portion 77B is in line symmetry with the first extension portion 77A across the U-phase power line 76U.

[0037] As shown in FIG. 2, the second motor generator 62 includes a first guide portion 78A. The first guide portion 78A protrudes downward from the protruding tip of the first extension portion 77A. As described above, the protruding tip of the first extension portion 77A is located above the horizontal portion 76VA of the V-phase power line 76V. Therefore, the horizontal portion 76VA of the V-phase power line 76V is located below the first guide portion 78A. The shape of the first guide portion 78A is a substantially rectangular plate shape. In this embodiment, when the first guide portion 78A is focused on, the U-phase power line 76U is the first power line, and the V-phase power line 76V is the second power line. Also, when the first guide portion 78A is focused on, the U-phase coil of the coil 74 is the first coil, and the V-phase coil of the coil 74 is the second coil.

[0038] As shown in FIG. 3, the second motor generator 62 includes a third extension portion 77C and a fourth extension portion 77D. The third extension portion 77C protrudes rightward from the right edge of the horizontal portion 76VA of the V-phase power line 76V. The protruding tip of the third extension portion 77C is located above the horizontal portion 76WA of the W-phase power line 76W. The third extension portion 77C has a substantially rectangular plate shape. One of the two main surfaces of the third extension portion 77C faces upward. The fourth extension portion 77D protrudes leftward from the left edge of the horizontal portion 76VA of the V-phase power line 76V. The fourth extension portion 77D is in line symmetry with the third extension portion 77C across the V-phase power line 76V.

[0039] As shown in FIG. 2, the second motor generator 62 includes a second guide portion 78B. The second guide portion 78B projects downward from the projecting tip of the third extension portion 77C. As described above, the projecting tip of the third extension portion 77C is located above the horizontal portion 76WA of the W-phase power line 76W. Therefore, the horizontal portion 76WA of the W-phase power line 76W is located below the second guide portion 78B. The shape of the second guide portion 78B is a substantially rectangular plate shape. In this embodiment, when the second guide portion 78B is focused on, the V-phase power line 76V is the first power line, and the W-phase power line 76W is the second power line. Also, when the second guide portion 78B is focused on, the V-phase coil of the coil 74 is the first coil, and the W-phase coil of the coil 74 is the second coil.

[0040] As shown in FIG. 3, the second motor generator 62 includes a fifth extension portion 77E and a sixth extension portion 77F. The fifth extension portion 77E protrudes rightward from the right edge of the horizontal portion 76WA of the W-phase power line 76W. The fifth extension portion 77E is substantially rectangular plate-shaped. One of the two main surfaces of the fifth extension portion 77E faces upward. The sixth extension portion 77F protrudes leftward from the left end of the horizontal portion 76WA of the W-phase power line 76W. The sixth extension portion 77F is in line symmetry with the fifth extension portion 77E across the W-phase power line 76W. Note that no guide portion such as the first guide portion 78A or the second guide portion 78B protrudes from the fifth extension portion 77E.

[0041] <Action of this embodiment> In the vehicle 100, for example, when the second motor generator 62 functions as an electric motor, the DC power from the battery 83 is converted into three-phase AC power by the second inverter 82. The three-phase AC power from the second inverter 82 is supplied to the coil 74 of the stator 72 via the U-phase power line 76U, the V-phase power line 76V, and the W-phase power line 76W. Therefore, the U-phase power line 76U, the V-phase power line 76V, the W-phase power line 76W, the stator 72, etc. generate heat in response to the power supplied to the stator 72 via the U-phase power line 76U, the V-phase power line 76V, and the W-phase power line 76W. In addition, when the second motor generator 62 functions as an electric motor in this way, the oil pump 87 is driven to supply oil from the oil pump 87 to the injector 30. The oil injected from the first injection hole 31 of the injector 30 is supplied to the stator 72, thereby cooling the stator 72. In addition, the oil injected from the second injection hole 32 of the injection device 30 is supplied to the U-phase power line 76U, the V-phase power line 76V, and the W-phase power line 76W, thereby cooling the U-phase power line 76U, the V-phase power line 76V, and the W-phase power line 76W.

[0042] <Effects of this embodiment> (1) In this embodiment, the second motor generator 62 includes a first extension portion 77A and a second extension portion 77B protruding from the U-phase power line 76U. One of the two main surfaces of the first extension portion 77A faces the second injection hole 32 of the injection device 30 and intersects with the second oil injection line 32A. Therefore, the oil injected from the second injection hole 32 of the injection device 30 is likely to hit the first extension portion 77A. If the first extension portion 77A is cooled by heat exchange with the supplied oil, the U-phase power line 76U connected to the first extension portion 77A is also cooled. If the oil supplied to the first extension portion 77A reaches the U-phase power line 76U through the first extension portion 77A, the U-phase power line 76U itself is cooled by heat exchange with the supplied oil. As a result, even if the oil injected from the injector 30 is unlikely to directly hit the U-phase power line 76U, the U-phase power line 76U can be more reliably cooled.

[0043] Similarly, the second motor generator 62 has a third extension portion 77C and a fourth extension portion 77D protruding from the V-phase power line 76V. Also, the second motor generator 62 has a fifth extension portion 77E and a sixth extension portion 77F protruding from the W-phase power line 76W. Therefore, even if the oil injected from the injector 30 is unlikely to directly hit the V-phase power line 76V and the W-phase power line 76W, the V-phase power line 76V and the W-phase power line 76W can be more reliably cooled.

[0044] (2) In this embodiment, the second motor generator 62 includes a first guide portion 78A that protrudes downward from the protruding tip of the first extension portion 77A. The horizontal portion 76VA of the V-phase power line 76V is located below the first guide portion 78A. Therefore, the oil supplied to the U-phase power line 76U and the first extension portion 77A is likely to drip from the first guide portion 78A and be supplied to the horizontal portion 76VA of the V-phase power line 76V. As a result, the V-phase power line 76V can be efficiently cooled by heat exchange with the oil supplied from the first guide portion 78A to the V-phase power line 76V.

[0045] Similarly, the second motor generator 62 includes a second guide portion 78B that protrudes downward from the protruding tip of the third extension portion 77C. A horizontal portion 76WA of the W-phase power line 76W is located below the second guide portion 78B. Therefore, the W-phase power line 76W can be efficiently cooled by heat exchange with the oil supplied from the second guide portion 78B to the W-phase power line 76W.

[0046] <Example of change> This embodiment can be modified as follows: This embodiment and the following modifications can be combined with each other to the extent that there is no technical contradiction.

[0047] In the above embodiment, the configurations of the first extension portion 77A to the sixth extension portion 77F may be changed. For example, the number of extension parts may be changed. As a specific example, the number of extension parts protruding from U-phase power line 76U may be one or may be three or more. From the viewpoint of more reliably cooling each of U-phase power line 76U, V-phase power line 76V, and W-phase power line 76W, it is preferable that one or more extension parts protrude from each of U-phase power line 76U, V-phase power line 76V, and W-phase power line 76W.

[0048] For example, the position from which the extension portion protrudes may be changed. As a specific example, the first extension portion 77A may protrude from a portion of the U-phase power line 76U other than the horizontal portion 76UA. Regardless of the portion from which the first extension portion 77A protrudes, as long as the main surface of the first extension portion 77A intersects with the second oil injection line 32A, the first extension portion 77A can receive oil. The same applies to the other extension portions, such as the second extension portion 77B.

[0049] For example, the orientation of the extension portion may be changed. As a specific example, one of the two main surfaces of the first extension portion 77A may face upward and forward. Here, from the viewpoint of supplying the oil injected from the second injection hole 32 of the injector 30 to the first extension portion 77A, it is preferable that one of the two main surfaces of the first extension portion 77A faces closer to the second injection hole 32 of the injector 30.

[0050] In the above embodiment, the configurations of the first guide portion 78A and the second guide portion 78B may be changed. For example, the number of guide parts may be changed. As a specific example, the number of guide parts protruding from the first extension part 77A may be more than one.

[0051] For example, the first guide portion 78A and the second guide portion 78B may be omitted. As a specific example, if sufficient oil can be supplied to the V-phase power line 76V by the third extension portion 77C, etc., the first guide portion 78A may be omitted. Similarly, if sufficient oil can be supplied to the W-phase power line 76W by the fifth extension portion 77E, etc., the second guide portion 78B may be omitted.

[0052] For example, the position from which the guide portion protrudes may be changed. As a specific example, when the right edge of horizontal portion 76UA of U-phase power line 76U is located above horizontal portion 76VA of V-phase power line 76V, first guide portion 78A may protrude downward from the right edge of horizontal portion 76UA of U-phase power line 76U. In other words, the guide portion may protrude from the power line.

[0053] For example, the shape of the guide portion may be changed. As a specific example, the shape of first guide portion 78A is not limited to a substantially rectangular plate shape, but may be a substantially triangular plate shape or a substantially rod shape. In other words, as long as first guide portion 78A can guide oil, the shape of first guide portion 78A can be changed as appropriate.

[0054] In the above embodiment, the configurations of U-phase power line 76U, V-phase power line 76V, and W-phase power line 76W may be changed. For example, U-phase power line 76U may not have horizontal portion 76UA. In other words, each power line may be located in a position where it is hit by oil from injector 30, and may connect coil 74 and terminal block 79.

[0055] For example, the shape of the U-phase power line 76U etc. does not have to be plate-like as a whole, and may be substantially rod-like. For example, the positional relationship between the U-phase power line 76U, the V-phase power line 76V, and the W-phase power line 76W may be changed. As a specific example, the positions of the U-phase power line 76U and the W-phase power line 76W may be interchanged.

[0056] In the above embodiment, the first motor generator 61 and the second motor generator 62 are not limited to three-phase synchronous motor generators, but may be two-phase AC motor generators. In other words, the present technology is not limited to motor generators with three power lines, but may be applied to motor generators with two power lines.

[0057] Incidentally, in order to efficiently cool the power lines in the cooling structure of the motor generator as disclosed in Patent Document 1, it is preferable for the oil to flow through not only one power line but multiple power lines. From the viewpoint of the oil flowing through multiple power lines in this manner, each extension portion may be omitted and only the guide portion may be provided.

[0058] The technical ideas that can be understood from the above-described embodiment and modified examples will be described below. a first end of the first power line connected to the first coil for supplying power to the first coil; a second power line having a first end connected to the second coil for supplying power to the second coil; a terminal block connected to a second end of the first power line and a second end of the second power line; and an injection device having an injection hole for injecting oil into the first power line, wherein the cooling structure for a motor generator includes a guide portion protruding downward from the first power line when the cooling structure is mounted on the vehicle and is based on the top and bottom of the vehicle, and a portion of the second power line is located below the guide portion. [Explanation of symbols]

[0059] 10. Internal combustion engine 20...Transaxle 30…Injection device 31...1st injection hole 31A…1st oil injection line 32…Second injection hole 32A…Second oil injection line 35…Case 40…First planetary gear mechanism 50…Second planetary gear mechanism 61…First motor generator 62…Second motor generator 66…Reduction mechanism 67…Differential 69…Drive wheels 71...Rotor 72…Stator 73…Stator core 74…Coil 76U…U phase power line 76V…V phase power line 76W…W phase power line 77A…First extension 77B…Second extension 77C…Third extension 77D…4th extension 77E…5th Extension 77F…6th Extension 78A…1st guide section 78B…Second guide section 79...Terminal block 86…Supply passage 87…Oil pump 90...Control device 100…Vehicle

Claims

[Claim 1] a stator including a cylindrical stator core, a first coil attached to the stator core, and a second coil attached to the stator core; a rotor positioned inside the stator as viewed from the stator; a first power line having a first end connected to the first coil for supplying power to the first coil; a second power line having a first end connected to the second coil for supplying power to the second coil; a terminal block connected to a second end of the first power line and a second end of the second power line; an injection device having an injection hole for injecting oil into the first power line; A cooling structure for a motor generator comprising: The power supply further includes a plate-shaped extension portion protruding from the first power line, When a virtual line passing through the center of the injection hole is defined as an oil injection line, One of the two main surfaces of the extension portion faces the injection hole and intersects with the oil injection line; When the vertical direction of the vehicle when the cooling structure is mounted on the vehicle is taken as a reference, a guide portion protruding downward from at least one of the first power line and the extension portion, A portion of the second power line is located below the guide portion. Cooling structure for a motor generator.

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