Inverter integrated motor

Abstract

To provide an inverter integrated motor capable of suppressing an immersion of moisture into a terminal insertion hole.SOLUTION: A motor housing 11 and an inverter housing are projected so as to approach each other, and projection parts 21 and 31 provided with penetration holes 21a and 31a as a terminal insertion hole into which a metal terminal is inserted are provided, respectively. The projection parts 21 and 31 have a seal structure surrounding the penetration holes 21a and 31a. In the inverter housing, a main projection guide part 22 surrounding one part of an inverter side projection part 21 is provided so as to be further projected from the inverter side projection part 21. In the motor housing 11, a sub-projected guide part 32 surrounding one part of the main projection guide part 22 is provided. Water entering between the motor housing 11 and the inverter housing is guided by the main projection guide part 22 and the sub-projected guide part 32 to suppress a residence at a circumference of the seal structure.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to an inverter-integrated electric motor. [Background technology]

[0002] Patent Document 1 discloses an inverter-integrated electric motor including a motor housing, an inverter housing, and metal terminals. The motor housing accommodates a motor. The inverter housing accommodates an inverter that drives the motor. The inverter housing is fixed to the motor housing. The metal terminals electrically connect the inverter and the motor. The motor housing and the inverter housing each have a terminal insertion hole through which the metal terminal is inserted. A seal member is disposed between the motor housing and the inverter housing. The seal member prevents moisture from entering the terminal insertion hole. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-165423 A Summary of the Invention [Problem to be solved by the invention]

[0004] In an inverter-integrated electric motor, a configuration that can further prevent moisture from entering the terminal insertion holes is required. [Means for solving the problem]

[0005] An inverter-integrated motor for solving the above problems is an inverter-integrated motor having a motor housing that accommodates a motor, an inverter housing that accommodates an inverter that drives the motor and is joined and fixed to the motor housing, and metal terminals that electrically connect the inverter and the motor, wherein the motor housing and the inverter housing are each provided with protruding portions that protrude toward each other and have terminal insertion holes through which the metal terminals are inserted, the protruding portions have a seal structure that surrounds the terminal insertion holes, one of the motor housing and the inverter housing is provided with a main ridge guide portion that protrudes further than the protruding portion and surrounds a portion of the protruding portion, and the other of the motor housing and the inverter housing is provided with a sub-ridge guide portion that surrounds a portion of the main ridge guide portion, and moisture that has entered between the motor housing and the inverter housing is guided by the main ridge guide portion and the sub-ridge guide portion, thereby suppressing stagnation around the seal structure.

[0006] A doubly formed main ridge guide portion and sub-ridge guide portion are provided around the seal structure of the terminal insertion hole. Therefore, the main ridge guide portion and sub-ridge guide portion act as a barrier to prevent moisture that has entered between the motor housing and the inverter housing from reaching the seal structure. Furthermore, moisture that has entered between the motor housing and the inverter housing is guided by the main ridge guide portion and sub-ridge guide portion, preventing it from accumulating around the seal structure. This further prevents moisture from entering the terminal insertion hole.

[0007] In the above-described inverter-integrated electric motor, the other of the motor housing and the inverter housing may be provided with a groove guide portion facing the main protrusion guide portion.

[0008] The main ridge guide portion and the groove guide portion form a labyrinth structure, which makes it more difficult for moisture that has entered between the motor housing and the inverter housing to reach the seal structure, thereby further preventing moisture from entering the terminal insertion hole.

[0009] In the above-mentioned inverter-integrated electric motor, the other of the motor housing and the inverter housing may be provided with a guide groove that forms part of the secondary protrusion guide portion, and moisture that has infiltrated between the motor housing and the inverter housing may be guided by the guide groove, thereby preventing moisture from accumulating around the seal structure.

[0010] Moisture that has entered between the motor housing and the inverter housing may travel along the sub-ridge guide portion and enter the inside of the sub-ridge guide portion. Moisture that has entered the inside of the sub-ridge guide portion enters the guide groove that constitutes part of the sub-ridge guide portion. As a result, moisture that has entered between the motor housing and the inverter housing is guided by the guide groove, preventing it from accumulating around the seal structure. This further prevents moisture from entering the terminal insertion hole.

[0011] In the above-described inverter-integrated electric motor, the motor housing and the inverter housing are each provided with a water channel protrusion that protrudes toward each other and has a cooling water channel through which cooling water flows to cool the motor and the inverter, the water channel protrusion has a water channel seal structure that surrounds the cooling water channel, one of the motor housing and the inverter housing is provided with a main water channel ridge guide portion that protrudes further than the water channel protrusion and surrounds a part of the water channel protrusion, and the other of the motor housing and the inverter housing is provided with a secondary water channel ridge guide portion that surrounds a part of the main water channel ridge guide portion, and moisture that has entered between the motor housing and the inverter housing is guided by the main water channel ridge guide portion and the secondary water channel ridge guide portion, thereby preventing moisture from accumulating around the water channel seal structure.

[0012] A doubly formed main ridge guide portion for water passage and sub ridge guide portion for water passage are provided around the seal structure of the cooling water passage. Therefore, the main ridge guide portion for water passage and the sub ridge guide portion for water passage act as a barrier to prevent moisture that has entered between the motor housing and the inverter housing from reaching the seal structure. Furthermore, moisture that has entered between the motor housing and the inverter housing is guided by the main ridge guide portion for water passage and the sub ridge guide portion for water passage, thereby preventing it from accumulating around the seal structure. This makes it possible to prevent moisture from entering the cooling water passage.

[0013] In the above-mentioned inverter-integrated electric motor, a liquid gasket surrounding the protrusion may be provided between the main ridge guide portion and one of the motor housing and the inverter housing that faces the main ridge guide portion.

[0014] The liquid gasket prevents moisture from entering the inside of the main ridge guide portion, thereby further preventing moisture from entering the terminal insertion hole. Effect of the Invention

[0015] According to the present invention, the intrusion of moisture into the terminal insertion hole can be further suppressed. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a schematic diagram of an inverter-integrated electric motor according to a first embodiment. [Diagram 2] 1 is a partial cross-sectional view of an inverter-integrated electric motor according to a first embodiment. [Diagram 3] FIG. 4 is a side view of the inverter housing. [Figure 4] FIG. [Diagram 5] 13 is a side view of the motor housing for explaining the position of a guide portion. FIG. [Figure 6] FIG. 11 is a partial cross-sectional view of a modified inverter-integrated electric motor. [Figure 7] FIG. 11 is a partial cross-sectional view of a modified inverter-integrated electric motor. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, one embodiment of an inverter-integrated electric motor will be described with reference to Figs. As shown in FIG. 1, the inverter-integrated electric motor 10 includes a motor housing 11, an inverter housing 12, a motor 13, an inverter 14, and metal terminals 15. The motor housing 11 accommodates the motor 13. The inverter housing 12 accommodates the inverter 14. The inverter housing 12 is coupled and fixed to the motor housing 11. The inverter 14 drives the motor 13. The metal terminals 15 electrically connect the inverter 14 and the motor 13. The metal terminals 15 are, for example, resolver wires or bus bars. Cooling water W for cooling the motor 13 and the inverter 14 flows inside the inverter-integrated electric motor 10. The inverter-integrated electric motor 10 is mounted on a vehicle so that the motor housing 11 and the inverter housing 12 are aligned horizontally.

[0018] <Inverter housing> 2, the inverter housing 12 has an inverter-side facing surface 12a that faces the motor housing 11. The inverter-side facing surface 12a is a surface perpendicular to the horizontal direction.

[0019] The inverter housing 12 has an inverter-side protrusion 21 as a protrusion that protrudes from the inverter-side opposing surface 12a toward the motor housing 11. In this embodiment, the inverter-side protrusion 21 is substantially cylindrical. The inverter-side protrusion 21 has an inverter-side through hole 21a. The inverter-side protrusion 21 has an annular seal groove 21c recessed from a tip end surface 21b.

[0020] The inverter housing 12 of this embodiment has three inverter side protrusions 21. The inverter side through hole 21a of the first inverter side protrusion 21 is a terminal insertion hole through which a resolver wire, which is a metal terminal 15, is inserted. The inverter side through hole 21a of the second inverter side protrusion 21 is a terminal insertion hole through which a bus bar, which is a metal terminal 15, is inserted. The inverter side through hole 21a of the third inverter side protrusion 21 is a cooling water channel through which the cooling water W flows. Therefore, the third inverter side protrusion 21 is a water channel protrusion.

[0021] The inverter housing 12 has main ridge guide portions 22 that protrude from the inverter side facing surface 12a toward the motor housing 11. The inverter housing 12 of this embodiment has three main ridge guide portions 22. The main ridge guide portions 22 protrude a greater amount from the inverter side facing surface 12a than the inverter side protrusion portions 21 protrude a greater amount from the inverter side facing surface 12a. Thus, the main ridge guide portions 22 protrude further than the inverter side protrusion portions 21.

[0022] 3, the main ridge guide portion 22 surrounds a part of the inverter side protrusion portion 21. One of the three main ridge guide portions 22 is a main ridge guide portion for water channel that surrounds a part of the protrusion for water channel.

[0023] The main ridge guide portion 22 of this embodiment is substantially rectangular. The main ridge guide portion 22 has first to fourth constituent portions 22a to 22d. The first constituent portion 22a and the second constituent portion 22b extend along the gravity direction. The first constituent portion 22a and the second constituent portion 22b are located on both sides of the inverter side protrusion 21 in the horizontal direction. The third constituent portion 22c is located above the inverter side protrusion 21 in the gravity direction. The third constituent portion 22c connects the upper end of the first constituent portion 22a and the upper end of the second constituent portion 22b. The fourth constituent portion 22d is located below the inverter side protrusion 21 in the gravity direction. The fourth constituent portion 22d is connected to the lower end of the second constituent portion 22b. The fourth constituent portion 22d is not connected to the lower end of the first constituent portion 22a. A gap S1 is provided between the first constituent portion 22a and the fourth constituent portion 22d. The third component portion 22c and the fourth component portion 22d are each inclined with respect to the horizontal direction. The third component portion 22c and the fourth component portion 22d are each inclined so as to face downward in the direction of gravity as they approach the first component portion 22a.

[0024] The inverter housing 12 has an inverter side groove 23 recessed from the inverter-side opposing surface 12a. The inverter side groove 23 constitutes part of the main ridge guide portion 22. More specifically, the inverter side groove 23 constitutes part of the lower surface of the fourth component portion 22d of the main ridge guide portion 22. The inverter side groove 23 extends along the fourth component portion 22d of the main ridge guide portion 22. In other words, the inverter side groove 23 is inclined downward in the direction of gravity as it approaches the first component portion 22a of the main ridge guide portion 22.

[0025] <Motor housing> 2, the motor housing 11 has a motor-side facing surface 11a that faces the inverter housing 12. The motor-side facing surface 11a is a surface perpendicular to the horizontal direction.

[0026] The motor housing 11 has a motor-side protrusion 31 as a protrusion that protrudes from the motor-side opposing surface 11a toward the inverter housing 12. The motor-side protrusion 31 in this embodiment is substantially cylindrical. The motor-side protrusion 31 has a motor-side through-hole 31a.

[0027] The motor housing 11 of this embodiment has three motor side protrusions 31. The motor side through hole 31a of the first motor side protrusion 31 is a terminal insertion hole through which a resolver wire, which is a metal terminal 15, is inserted. The motor side through hole 31a of the second motor side protrusion 31 is a terminal insertion hole through which a bus bar, which is a metal terminal 15, is inserted. The motor side through hole 31a of the third motor side protrusion 31 is a cooling water passage through which cooling water W flows. Therefore, the third motor side protrusion 31 is a water passage protrusion.

[0028] The motor housing 11 has a sub-protrusion guide portion 32 that protrudes from the motor side facing surface 11a toward the inverter housing 12. The motor housing 11 of this embodiment has three sub-protrusion guide portions 32. The amount by which the sub-protrusion guide portions 32 protrude from the motor side facing surface 11a is greater than the amount by which the motor side protrusion portions 31 protrude from the motor side facing surface 11a. Therefore, the sub-protrusion guide portions 32 protrude further than the motor side protrusion portions 31.

[0029] 4, the sub-protrusion guide portion 32 surrounds a portion of the motor-side protrusion 31. One of the three sub-protrusion guide portions 32 is a sub-protrusion guide portion for water passage that surrounds a portion of the protrusion for water passage.

[0030] The sub-protrusion guide portion 32 of this embodiment is substantially rectangular. The sub-protrusion guide portion 32 has first to fourth portions 32a to 32d. The first portion 32a and the second portion 32b extend along the direction of gravity. The first portion 32a and the second portion 32b are located on both sides of the motor side protrusion 31 in the horizontal direction. The third portion 32c is located above the motor side protrusion 31 in the direction of gravity. The third portion 32c connects the upper end of the first portion 32a to the upper end of the second portion 32b. The fourth portion 32d is located below the motor side protrusion 31 in the direction of gravity. The fourth portion 32d is connected to the lower end of the second portion 32b. The fourth portion 32d is not connected to the lower end of the first portion 32a. A gap S2 is provided between the first portion 32a and the fourth portion 32d. The third portion 32c and the fourth portion 32d are each inclined with respect to the horizontal direction. The third portion 32c and the fourth portion 32d are each inclined downward in the direction of gravity as they approach the first portion 32a.

[0031] The motor housing 11 has a groove guide portion 33 recessed from the motor side facing surface 11a. The groove guide portion 33 surrounds the motor side protrusion 31. The outer edge of the groove guide portion 33 is rectangular.

[0032] The motor housing 11 has a motor side groove 34 serving as a guide groove recessed from the motor side opposing surface 11a. The motor side groove 34 constitutes a part of the secondary ridge-like guide portion 32. More specifically, the motor side groove 34 constitutes a part of the underside of the third portion 32c of the secondary ridge-like guide portion 32. The motor side groove 34 extends along the third portion 32c of the secondary ridge-like guide portion 32. In other words, the motor side groove 34 is inclined downward in the direction of gravity as it approaches the first portion 32a of the secondary ridge-like guide portion 32.

[0033] <Relationship between inverter housing and motor housing> As shown in Fig. 2, the motor housing 11 and the inverter housing 12 are arranged so that the motor side opposing surface 11a and the inverter side opposing surface 12a face each other. The motor side protrusion 31 and the inverter side protrusion 21 protrude from the motor housing 11 or the inverter housing 12 so as to approach each other. The tip surface 31b of the motor side protrusion 31 and the tip surface 21b of the inverter side protrusion 21 abut against each other. The motor side through hole 31a and the inverter side through hole 21a are in communication with each other.

[0034] Between the motor side protrusion 31 and the inverter side protrusion 21, an annular seal member 16 is disposed. The seal member 16 is, for example, an O-ring. The seal member 16 is disposed in the seal groove 21c of the inverter side protrusion 21. The seal member 16 is in close contact with the surface that defines the seal groove 21c and is in close contact with the tip surface 31b of the motor side protrusion 31. The seal member 16 seals between the motor side protrusion 31 and the inverter side protrusion 21. Of the three protrusions 21, 31, the two protrusions 21, 31 having the through holes 21a, 31a as terminal insertion holes have a seal structure that surrounds the terminal insertion holes. Of the three protrusions 21, 31, the protrusions 21, 31 having the through holes 21a, 31a as cooling water channels have a water channel seal structure that surrounds the cooling water channel.

[0035] 2 and 5, the main ridge guide portion 22 surrounds a portion of the protrusions 21, 31. The tip of the main ridge guide portion 22 faces the recessed ridge guide portion 33. The sub-ridge guide portion 32 surrounds a portion of the main ridge guide portion 22. In other words, the inverter side protrusion 21 and the motor side protrusion 31 are surrounded by the two guide portions, the main ridge guide portion 22 and the sub-ridge guide portion 32. A gap is provided between a portion of the motor side facing surface 11a located outside the sub-ridge guide portion 32 and the inverter side facing surface 12a.

[0036] [Operation of this embodiment] The operation of this embodiment will now be described. The motor housing 11 and the inverter housing 12 are respectively provided with protrusions 21, 31 that protrude toward each other. The protrusions 21, 31 have through holes 21a, 31a. The protrusions 21, 31 have a seal structure that surrounds the through holes 21a, 31a. The inverter housing 12 is provided with a main ridge guide portion 22 that protrudes further than the inverter side protrusion 21 and surrounds a portion of the inverter side protrusion 21. The motor housing 11 is provided with a sub-ridge guide portion 32 that surrounds a portion of the main ridge guide portion 22. In other words, the main ridge guide portion 22 and the sub-ridge guide portion 32 are provided doubly around the seal structure of the through holes 21a, 31a.

[0037] For this reason, the sub-ridge guide portion 32 located on the outermost periphery acts as a barrier to prevent moisture that has entered between the motor housing 11 and the inverter housing 12 from flowing toward the seal structure. Even if moisture passes over the sub-ridge guide portion 32 and enters inside the sub-ridge guide portion 32, the main-ridge guide portion 22 is provided inside the sub-ridge guide portion 32. For this reason, the main-ridge guide portion 22 acts as a barrier to prevent moisture that has entered inside the sub-ridge guide portion 32 from flowing toward the seal structure. In this way, the main-ridge guide portion 22 and the sub-ridge guide portion 32 act as double barriers to prevent moisture that has entered between the motor housing 11 and the inverter housing 12 from reaching the seal structure.

[0038] Furthermore, any moisture that has entered between the motor housing 11 and the inverter housing 12 is prevented from accumulating around the seal structure by being guided by the main ridge guide portion 22 and the sub-ridge guide portion 32. The guide of moisture by the main ridge guide portion 22 and the sub-ridge guide portion 32 will be described in detail below.

[0039] First, the flow of moisture that has entered between the motor housing 11 and the inverter housing 12 from above the inverter-integrated electric motor 10 will be described. Moisture that has entered between the motor housing 11 and the inverter housing 12 from above the inverter-integrated electric motor 10 rests on the upper surface of the third portion 32c of the secondary ridge guide portion 32. The third portion 32c is inclined with respect to the horizontal direction. Therefore, the moisture that has rested on the upper surface of the third portion 32c moves toward the first portion 32a and then flows downward in the direction of gravity along the outer surface of the first portion 32a.

[0040] Some of the moisture that penetrates between the motor housing 11 and the inverter housing 12 from above the inverter-integrated electric motor 10 may penetrate into the inside of the secondary ridge guide portion 32 from between the inverter side opposing surface 12a and the tip of the third portion 32c of the secondary ridge guide portion 32.

[0041] Moisture that has entered the inside of the secondary ridge-like guide portion 32 along the tip of the third portion 32c of the secondary ridge-like guide portion 32 enters the motor-side groove 34. The motor-side groove 34 is inclined with respect to the horizontal direction. For this reason, the moisture that has entered the motor-side groove 34 moves toward the first portion 32a of the secondary ridge-like guide portion 32. The moisture that has moved to the end of the motor-side groove 34 then flows downward in the direction of gravity along the inner surface of the first portion 32a, and is then discharged through the gap S2 of the secondary ridge-like guide portion 32 to the outside of the secondary ridge-like guide portion 32.

[0042] Moisture that has entered the inside of the secondary ridge-like guide portion 32 through the gap between the inverter-side facing surface 12a and the tip of the third portion 32c of the secondary ridge-like guide portion 32 sits on the upper surface of the third component portion 22c of the main ridge-like guide portion 22. The third component portion 22c is inclined with respect to the horizontal direction. For this reason, the moisture that sits on the upper surface of the third component portion 22c moves toward the first component portion 22a of the main ridge-like guide portion 22 and then flows downward in the direction of gravity along the outer surface of the first component portion 22a. The moisture that has flowed along the outer surface of the first component portion 22a is then discharged from the gap S2 of the secondary ridge-like guide portion 32 to the outside of the secondary ridge-like guide portion 32.

[0043] Furthermore, some of the moisture that has infiltrated into the inside of the sub-protrusion guide portion 32 may infiltrate into the inside of the main-protrusion guide portion 22 from between the third constituent portion 22c of the main-protrusion guide portion 22 and the recessed-protrusion guide portion 33. The moisture that has infiltrated into the inside of the main-protrusion guide portion 22 rides on the upper surfaces of the protrusions 21, 31. The protrusions 21, 31 are cylindrical. Therefore, the moisture that rides on the upper surfaces of the protrusions 21, 31 flows downward in the direction of gravity along the outer circumferential surfaces of the protrusions 21, 31. Then, the moisture that reaches the lower surfaces of the protrusions 21, 31 drips down onto the fourth constituent portion 22d of the main-protrusion guide portion 22. The fourth constituent portion 22d is inclined with respect to the horizontal direction. Therefore, the moisture that has dripped down onto the fourth constituent portion 22d flows toward the first constituent portion 22a and is then discharged to the outside of the main-protrusion guide portion 22 through the gap S1 of the main-protrusion guide portion 22. The moisture discharged to the outside of the main ridge-like guide portion 22 is further discharged to the outside of the secondary ridge-like guide portion 32 through the gap S2 of the secondary ridge-like guide portion 32.

[0044] Next, the flow of moisture that has entered between the motor housing 11 and the inverter housing 12 from the side of the inverter-integrated electric motor 10 will be described. Moisture that has entered between the motor housing 11 and the inverter housing 12 from the side of the inverter-integrated electric motor 10 comes into contact with the outer surface of the first portion 32a or the outer surface of the second portion 32b of the secondary ridge guide portion 32. The first portion 32a and the second portion 32b extend along the direction of gravity. Therefore, moisture that comes into contact with the first portion 32a or the second portion 32b flows downward in the direction of gravity along the first portion 32a or the second portion 32b.

[0045] Some of the moisture that has infiltrated between the motor housing 11 and the inverter housing 12 from the side of the inverter-integrated electric motor 10 may pass over the first portion 32a and the second portion 32b of the sub-protrusion guide portion 32 and infiltrate into the inside of the sub-protrusion guide portion 32. The moisture that has infiltrated into the inside of the sub-protrusion guide portion 32 comes into contact with the outer surface of the first component portion 22a or the second component portion 22b of the main protrusion guide portion 22. The first component portion 22a and the second component portion 22b extend in the direction of gravity. For this reason, the moisture that has come into contact with the first component portion 22a or the second component portion 22b flows downward in the direction of gravity along the outer surface of the first component portion 22a or the second component portion 22b.

[0046] Moisture that has flowed to the lower end of the first component portion 22a is discharged from the gap S1 in the main ridge guide portion 22 to the outside of the sub-ridge guide portion 32. On the other hand, moisture that has flowed to the lower end of the second component portion 22b enters the inverter side groove 23. The inverter side groove 23 is inclined with respect to the horizontal direction. For this reason, the moisture that has entered the inverter side groove 23 moves toward the first component portion 22a of the main ridge guide portion 22, and then is discharged from the gap S2 in the sub-ridge guide portion 32 to the outside of the sub-ridge guide portion 32.

[0047] Furthermore, some of the moisture that has penetrated inside the auxiliary ridge-shaped guide portion 32 may pass over the first component portion 22a or the second component portion 22b of the main ridge-shaped guide portion 22 and penetrate into the inside of the main ridge-shaped guide portion 22. Note that the moisture that has penetrated inside the main ridge-shaped guide portion 22 comes into contact with the outer circumferential surfaces of the protrusions 21, 31, and then flows downward in the direction of gravity along the outer circumferential surfaces of the protrusions 21, 31. Note that the subsequent flow of the moisture has been described above, so a description thereof will be omitted.

[0048] [Effects of this embodiment] The effects of this embodiment will be described. (1) The motor housing 11 and the inverter housing 12 are provided with protruding portions 21, 31 that protrude toward each other. The protruding portions 21, 31 have through holes 21a, 31a as terminal insertion holes through which the metal terminals 15 are inserted. The protruding portions 21, 31 have a seal structure that surrounds the through holes 21a, 31a. The inverter housing 12 is provided with a main ridge guide portion 22 that protrudes further than the inverter side protruding portion 21 and surrounds a part of the inverter side protruding portion 21. The motor housing 11 is provided with a sub-ridge guide portion 32 that surrounds a part of the main ridge guide portion 22. In other words, the main ridge guide portion 22 and the sub-ridge guide portion 32 are provided in a double layer around the seal structure of the through holes 21a, 31a. For this reason, the main ridge guide portion 22 and the sub-ridge guide portion 32 act as barriers to prevent moisture that has entered between the motor housing 11 and the inverter housing 12 from reaching the seal structure. In addition, moisture that has entered between the motor housing 11 and the inverter housing 12 is prevented from accumulating around the seal structure by being guided by the main ridge guide portion 22 and the sub ridge guide portion 32. This further prevents moisture from entering the through holes 21a, 31a, which are terminal insertion holes.

[0049] (2) The motor housing 11 is provided with a grooved-line guide portion 33 that faces the main ridge-like guide portion 22. The main ridge-like guide portion 22 and the grooved-line guide portion 33 form a labyrinth structure. Therefore, the labyrinth structure makes it more difficult for moisture that has entered between the motor housing 11 and the inverter housing 12 to reach the seal structure. This further prevents moisture from entering the through holes 21a, 31a.

[0050] (3) Moisture that has entered between the motor housing 11 and the inverter housing 12 may flow along the sub-ridge guide portion 32 and enter the inside of the sub-ridge guide portion 32. Moisture that has entered the inside of the sub-ridge guide portion 32 enters the motor side groove 34 that constitutes part of the sub-ridge guide portion 32. For this reason, moisture that has entered between the motor housing 11 and the inverter housing 12 is guided by the motor side groove 34, thereby preventing it from accumulating around the seal structure. This further prevents moisture from entering the through holes 21a, 31a.

[0051] (4) The motor housing 11 and the inverter housing 12 are provided with protruding portions 21, 31 that protrude toward each other. The protruding portions 21, 31 have through holes 21a, 31a as cooling water channels through which the cooling water W flows. The protruding portions 21, 31 have a seal structure that surrounds the through holes 21a, 31a. The inverter housing 12 is provided with a main ridge guide portion 22 that protrudes further than the inverter side protruding portion 21 and surrounds a part of the inverter side protruding portion 21. The motor housing 11 is provided with a sub-ridge guide portion 32 that surrounds a part of the main ridge guide portion 22. In other words, the main ridge guide portion 22 and the sub-ridge guide portion 32 are provided doubly around the seal structure of the through holes 21a, 31a. For this reason, the main ridge guide portion 22 and the sub-ridge guide portion 32 act as barriers to prevent moisture that has entered between the motor housing 11 and the inverter housing 12 from reaching the seal structure. In addition, moisture that has entered between the motor housing 11 and the inverter housing 12 is prevented from accumulating around the seal structure by being guided by the main ridge guide portion 22 and the sub ridge guide portion 32. This makes it possible to prevent moisture from entering the through holes 21a, 31a, which serve as the cooling water passages.

[0052] (5) The main ridge guide portion 22 protrudes further than the inverter side protrusion 21. Therefore, the main ridge guide portion 22 can surround the connection point between the inverter side protrusion 21 and the motor side protrusion 31. Similarly, the sub ridge guide portion 32 protrudes further than the motor side protrusion 31. Therefore, the sub ridge guide portion 32 can surround the connection point between the inverter side protrusion 21 and the motor side protrusion 31. This makes it possible to further prevent water from entering the connection point between the inverter side protrusion 21 and the motor side protrusion 31.

[0053] (6) Moisture that has entered between the motor housing 11 and the inverter housing 12 is guided by the main ridge guide portion 22 and the sub ridge guide portion 32, thereby preventing the moisture from accumulating around the seal structure. This prevents the seal structure from being corroded by moisture. In this case, the anodizing process that was previously performed to improve the corrosion resistance of the motor housing 11 and the inverter housing 12 can be omitted.

[0054] [Example of change] The above-described embodiments can be modified as follows: The above-described embodiments and the following modifications can be combined with each other to the extent that no technical contradiction occurs.

[0055] The main ridge guide 22 may be provided in the motor housing 11 , and the sub ridge guide 32 and the groove guide 33 may be provided in the inverter housing 12 . In the above embodiment, the main ridge guide portion 22 surrounds almost the entire periphery of the protrusions 21, 31 except for the gap S1. However, the area in which the main ridge guide portion 22 surrounds the protrusions 21, 31 may be narrower than in the above embodiment.

[0056] In the above embodiment, the secondary ridge-like guide portion 32 surrounds almost the entire circumference of the main ridge-like guide portion 22 except for the gap S2. However, the area in which the secondary ridge-like guide portion 32 surrounds the main ridge-like guide portion 22 may be narrower than in the above embodiment.

[0057] When the two protrusions 21, 31 are disposed close to each other, a portion of the main protrusion guide portion 22 surrounding one of the protrusions 21, 31 may also serve as a portion of the main protrusion guide portion 22 surrounding the other protrusion 21, 31.

[0058] When two protrusions 21, 31 are disposed close to each other, the secondary protrusion guide portion 32 may be arranged to surround both the main protrusion guide portion 22 surrounding one of the protrusions 21, 31 and the main protrusion guide portion 22 surrounding the other protrusion 21, 31.

[0059] The inverter gutter 23 may be omitted. The inverter groove 23 does not have to constitute a part of the main ridge guide portion 22 . The groove guide portion 33 may be omitted. In this case, the tip end of the main ridge guide portion 22 faces the motor side facing surface 11a of the motor housing 11.

[0060] The motor gutter 34 may be omitted. The motor groove 34 does not have to constitute a part of the secondary ridge guide portion 32 . The shapes of the main ridge guide portion 22 and the sub ridge guide portion 32 in the above embodiment are just examples. As long as moisture that has entered between the motor housing 11 and the inverter housing 12 is guided by each guide portion 22, 32 and does not accumulate around the seal structure, the shapes of each guide portion 22, 32 may be changed as appropriate.

[0061] The motor 13 and the inverter 14 do not have to be cooled by the cooling water W. In this case, the water channel protrusion, the water channel main ridge guide, and the water channel sub ridge guide are not necessary. As shown in FIG. 6, the motor housing 11 may have a discharge passage 35 that connects the gap between the motor-side protrusion 31 and the inverter-side protrusion 21 to the outside of the motor housing 11. The discharge passage 35 is composed of a first passage 35a and a second passage 35b. The first passage 35a is a portion recessed from the tip surface 31b of the motor-side protrusion 31. The first passage 35a surrounds the seal member 16. The first passage 35a is slit-shaped. Note that the width of the first passage 35a is exaggerated in FIG. 6. The second passage 35b is a portion that connects the bottom surface of the first passage 35a to the outside of the motor housing 11. The second passage 35b opens, for example, to a surface 11b of the motor housing 11 opposite to the motor-side facing surface 11a.

[0062] In this case, even if moisture penetrates between the motor-side protrusion 31 and the inverter-side protrusion 21, it enters the first passage 35a before reaching the seal member 16. More specifically, since the first passage 35a is slit-shaped, moisture that penetrates between the motor-side protrusion 31 and the inverter-side protrusion 21 enters the first passage 35a by capillary action. The moisture that enters the first passage 35a flows through the second passage 35b by gravity and is then discharged to the outside of the motor housing 11. This prevents moisture from reaching the seal member 16. As a result, corrosion of the seal member 16 is suppressed.

[0063] The discharge passage 35 may be provided in the inverter housing 12 instead of the motor housing 11, or may be provided in both the motor housing 11 and the inverter housing 12.

[0064] 7, a liquid gasket 17 that surrounds the protrusions 21, 31 may be provided between the main ridge-like guide portion 22 and the motor housing 11, which is the housing that faces the main ridge-like guide portion 22. In this case, the liquid gasket 17 prevents moisture from entering the inside of the main ridge-like guide portion 22. This further prevents moisture from entering the through holes 21a, 31a. An O-ring may be provided instead of the liquid gasket 17. [Explanation of symbols]

[0065] 10... inverter-integrated electric motor, 11... motor housing, 12... inverter housing, 13... motor, 14... inverter, 15... metal terminal, 17... liquid gasket, 21... inverter side protrusion as protrusion, 21a... terminal insertion hole or through hole as cooling water passage, 22... main ridge guide portion, 31... motor side protrusion as protrusion, 31a... terminal insertion hole or through hole as cooling water passage, 32... secondary ridge guide portion, 33... recessed ridge guide portion, 34... motor side groove as guide groove, W... cooling water.

Claims

1. a motor housing that accommodates a motor; an inverter housing that houses an inverter that drives the motor and is fixedly coupled to the motor housing; a metal terminal electrically connecting the inverter and the motor; An inverter-integrated motor having The motor housing and the inverter housing are each provided with a protruding portion that protrudes toward each other and has a terminal insertion hole through which the metal terminal is inserted, the protrusion has a seal structure surrounding the terminal insertion hole, a main ridge guide portion that protrudes further than the protrusion and surrounds a portion of the protrusion is provided on one of the motor housing and the inverter housing, and a sub-ridge guide portion that surrounds a portion of the main ridge guide portion is provided on the other of the motor housing and the inverter housing, An inverter-integrated electric motor characterized in that moisture that penetrates between the motor housing and the inverter housing is guided by the main ridge guide portion and the secondary ridge guide portion, thereby preventing moisture from accumulating around the sealing structure.

2. 2. The inverter-integrated electric motor according to claim 1, wherein the other of the motor housing and the inverter housing is provided with a groove guide portion facing the main protrusion guide portion.

3. a guide groove that constitutes a part of the sub-protrusion guide portion is provided in the other of the motor housing and the inverter housing, 3. The inverter-integrated electric motor according to claim 2, wherein moisture that has entered between the motor housing and the inverter housing is guided by the guide groove, and is prevented from accumulating around the seal structure.

4. the motor housing and the inverter housing are each provided with a water passage protrusion portion that protrudes toward each other and has a cooling water passage through which cooling water for cooling the motor and the inverter flows; the water passage protrusion has a water passage seal structure surrounding the cooling water passage, a main water channel ridge guide portion that protrudes further than the water channel ridge portion and surrounds a portion of the water channel ridge portion is provided on one of the motor housing and the inverter housing, and a sub water channel ridge guide portion that surrounds a portion of the main water channel ridge guide portion is provided on the other of the motor housing and the inverter housing, An inverter-integrated electric motor as described in any one of claims 1 to 3, wherein moisture that has penetrated between the motor housing and the inverter housing is guided by the main ridge guide portion for the water passage and the secondary ridge guide portion for the water passage, thereby preventing moisture from accumulating around the water passage seal structure.

5. An inverter-integrated motor as described in any one of claims 1 to 4, wherein a liquid gasket surrounding the protrusion is provided between the main ridge guide portion and one of the motor housing and the inverter housing that faces the main ridge guide portion.

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