Motor unit

Abstract

The present invention provides a motor unit, which has a housing for accommodating a motor and an oil cooler. The housing is provided with a setting surface for setting the oil cooler, an internal oil circuit for oil flow, and an internal water circuit for cooling water flow. An oil inlet for introducing oil into the oil cooler and a cooling water outlet for discharging cooling water from the oil cooler are provided on an opposite surface of the oil cooler opposite to the setting surface. The internal oil circuit has: a first oil circuit opening, which is opposite to the oil inlet and opens to the setting surface; and a first oil circuit processing hole, which is connected to the first oil circuit opening and extends in a straight line along the setting surface. The internal water circuit has: a first water circuit opening, which is opposite to the cooling water outlet and opens to the setting surface; and a first water circuit processing hole, which is connected to the first water circuit opening and extends in a straight line along the setting surface. When observed from the normal direction of the setting surface, the first oil circuit processing hole and the first water circuit processing hole are arranged at different positions from each other.

Description

Technical Field

[0001] The invention relates to a motor unit. Background Art

[0002] In a motor, as the drive output increases, the heat generated also increases. Therefore, high-output motors such as drive motors of electric vehicles are cooled by oil. Japanese Publication No. 2012-097788 discloses a circulation structure in which oil used for lubrication of various parts circulates in an oil cooler while being cooled.

[0003] In recent years, the development of motor units that unitize auxiliary machines such as oil coolers with motors to achieve overall miniaturization has been underway. In such a motor unit, the piping for oil and the piping for cooling water are directly connected to the oil cooler, respectively. However, if such a structure is adopted, there is a problem that the piping makes the motor unit larger as a whole. Therefore, the present invention and others contemplate miniaturizing the motor unit by providing an internal oil circuit and an internal water circuit in the wall portion of the housing that accommodates the motor. However, when the housing is manufactured by die casting, a cavity is sometimes generated inside the wall portion of the housing, and it is possible that the internal oil circuit and the internal water circuit are connected to each other via the cavity. Summary of the invention

[0004] In view of the above problems, an object of one embodiment of the present invention is to provide a motor unit that provides an internal oil passage and an internal water passage in a casing to achieve overall miniaturization and suppress communication between the internal oil passage and the internal water passage.

[0005] One embodiment of the present invention is a motor unit, which has: a motor having a shaft rotating around a motor axis; a housing that accommodates the motor; oil accommodated in the housing; and an oil cooler that cools the oil using cooling water. The housing is provided with a setting surface for the oil cooler, an internal oil path for the oil to flow, and an internal water path for the cooling water to flow. An oil inlet for introducing oil into the oil cooler and a cooling water outlet for discharging cooling water from the oil cooler are provided on an opposing surface of the oil cooler that is opposite to the setting surface. The internal oil path has: a first oil path opening that is opposite to the oil inlet and opens to the setting surface; a first oil path processing hole that is connected to the first oil path opening and extends in a straight line along the setting surface. The internal water path has: a first water path opening that is opposite to the cooling water outlet and opens to the setting surface; and a first water path processing hole that is connected to the first water path opening and extends in a straight line along the setting surface. When viewed from the normal direction of the installation surface, the first oil channel machined hole and the first water channel machined hole are arranged at different positions from each other.

[0006] According to one aspect of the present invention, there is provided a motor unit in which an internal oil passage and an internal water passage are provided in a casing, thereby achieving overall miniaturization and suppressing communication between the internal oil passage and the internal water passage.

[0007] The above and other features, elements, steps, characteristics and advantages of the present invention will be more clearly understood from the following detailed description of preferred embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a conceptual diagram of a motor unit 1 according to one embodiment.

[0009] Figure 2 This is a sagittal view of the motor unit according to one embodiment as viewed in the normal direction of the installation surface.

[0010] Figure 3 is along Figure 2 A cross-sectional view of a motor unit of one embodiment taken along line III-III. DETAILED DESCRIPTION

[0011] Hereinafter, the motor of the embodiment of the present invention will be described with reference to the accompanying drawings. In the following description, the direction of gravity is specified and described based on the positional relationship of the motor unit 1 mounted on a vehicle located on a horizontal road surface. In addition, in the accompanying drawings, the Y-axis direction is appropriately shown. The Y-axis direction shows the width direction (left-right direction) of the vehicle. In this embodiment, the +Y direction is the left side of the vehicle, and the -Y direction is the right side of the vehicle.

[0012] In the following description, unless otherwise specified, the direction parallel to the motor axis J2 of the motor 2 (Y-axis direction) is referred to as the "axial direction". In addition, the left side of the vehicle (i.e., the +Y side) is referred to as the "one axial direction", and the right side of the vehicle (i.e., the -Y side) is referred to as the "other axial direction". In addition, the radial direction centered on the motor axis J2 is referred to as the "radial direction", and the circumferential direction centered on the motor axis J2 (i.e., the direction around the motor axis J2) is referred to as the "circumferential direction".

[0013] Figure 1 This is a conceptual diagram of a motor unit 1 according to an embodiment. The motor unit 1 drives a vehicle. The motor unit 1 is mounted on a vehicle such as a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHV), and an electric vehicle (EV) that uses a motor as a power source, and is used as the power source.

[0014] like Figure 1As shown, the motor unit 1 has a motor 2, a gear part 3, a housing 6, oil O, a pump 96 and a cooler 97. A storage space 80 for accommodating the motor 2 and the gear part 3 is provided inside the housing 6. The storage space 80 is divided into a motor chamber 81 for accommodating the motor 2 and a gear chamber 82 for accommodating the gear part 3. In addition, in the present embodiment, the motor unit 1 does not include an inverter. In other words, the drive device 1 and the inverter are separate structures. In addition, the motor unit 1 of the present embodiment does not include an inverter, but may also include an inverter. In other words, the motor unit 1 and the inverter may also be integrally constructed.

[0015] <Motor>

[0016] The motor 2 is accommodated in the motor chamber 81 of the housing 6. The motor 2 includes a rotor 20 and a stator 30 located radially outside the rotor 20. The motor 2 is an inner rotor type motor including the stator 30 and the rotor 20 rotatably disposed inside the stator 30.

[0017] Power is supplied to the stator 30 from a battery (not shown) via an inverter (not shown), thereby rotating the rotor 20. The rotor 20 has a shaft 21, a rotor core 24, and a rotor magnet (not shown). The rotor 20 rotates around the motor axis J2. The torque of the rotor 20 is transmitted to the differential device 5 via the reduction gear 4. The shaft 21 extends around the motor axis J2 extending in the vehicle width direction (first direction). The shaft 21 rotates around the motor axis J2. The shaft 21 is a hollow shaft having a hollow portion 22 having an inner peripheral surface extending along the motor axis J2.

[0018] The stator 30 surrounds the rotor 20 from the radially outer side. The stator 30 includes a stator core 32, a coil 31, and an insulator (not shown) between the stator core 32 and the coil 31. The stator 30 is held by the housing 6. The stator core 32 includes a plurality of magnetic pole teeth (not shown) extending radially inward from the inner circumference of the annular yoke. The coil wire is wound between the magnetic pole teeth. The coil wire wound around the magnetic pole teeth constitutes the coil 31.

[0019] <Gear Department>

[0020] The gear unit 3 includes a reduction gear 4 and a differential device 5. The reduction gear 4 reduces the rotation speed of the motor 2 and has a function of increasing the torque output from the motor 2 according to the reduction ratio. The reduction gear 4 transmits the torque output from the motor 2 to the differential device 5. The differential device 5 is a device for transmitting the torque output from the motor 2 to the wheels of the vehicle. The differential device 5 has a function of absorbing the speed difference between the left and right wheels when the vehicle turns, and transmitting the same torque to a pair of output shafts 55.

[0021] The reduction gear 4 includes a pinion 41, an intermediate shaft 45, an intermediate gear 42 fixed to the intermediate shaft 45, and a drive gear 43. The torque output from the motor 2 is transmitted to the ring gear 51 of the differential device 5 via the shaft 21 of the motor 2, the pinion 41, the intermediate gear 42, and the drive gear 43. The gear ratio of each gear and the number of gears can be variously changed according to the required reduction ratio. The reduction gear 4 is a parallel axis gear type reducer in which the shaft cores of each gear are arranged in parallel.

[0022] The differential device 5 includes a ring gear 51 and a pair of output shafts 55. Although not shown in the figure, the differential device 5 includes a transmission portion (not shown in the figure) that transmits equal torque from the ring gear 51 to the pair of output shafts 55. The pair of output shafts 55 extend in the axial direction. The pair of output shafts 55 transmits the torque of the motor 2 to the road surface via the wheels.

[0023] <Casing>

[0024] The housing 6 is composed of a plurality of parts. The housing 6 is made of an aluminum alloy. In addition, the parts constituting the housing 6 are die-cast products. The housing 6 has a motor housing portion 61 for housing the motor 2 and a gear housing portion 62 for housing the gear portion 3. A motor chamber 81 is provided inside the motor housing portion 61. A gear chamber 82 is provided inside the gear housing portion 62.

[0025] The motor housing portion 61 has a cylindrical peripheral wall portion 61a extending axially with the motor axis J2 as the center. The peripheral wall portion 61a surrounds the motor 2 from the radially outer side. A setting surface 61b is provided on the outer peripheral surface of the peripheral wall portion 61a, and the setting surface 61b is provided for the cooler (oil cooler) 97. The setting surface 61b is a plane facing the radially outer side of the motor axis J2.

[0026] <Oil>

[0027] The oil O is used for lubrication of the reduction gear 4 and the differential gear 5. In addition, the oil O is used for cooling the motor 2. The oil O is stored in the lower area (i.e., the oil reservoir P) in the gear chamber 82. In order for the oil O to function as a lubricating oil and a cooling oil, it is preferable to use an oil equivalent to an automatic transmission lubricating oil (ATF: Automatic Transmission Fluid) with a relatively low viscosity.

[0028] In the motor unit 1 , the oil O circulates in the oil passage 90 . The oil passage 90 is a path for supplying the oil O from the oil reservoir P in the lower region of the gear chamber 82 to the motor 2 . The oil passage 90 includes a first oil passage 91 and a second oil passage 92 .

[0029] In the first oil passage 91, the oil O is lifted from the oil reservoir P by the intermediate gear 42 in the gear chamber 82 and guided to the pre-filter box 93. A portion of the oil O accumulated in the pre-filter box 93 is guided to the bearings supporting each shaft to improve the lubricity of each bearing. In addition, another portion of the oil O accumulated in the pre-filter box 93 is provided to the inside of the shaft 21 through the first oil introduction passage 68b. The centrifugal force based on the rotation of the rotor 20 causes the oil O provided to the hollow portion 22 to continuously splash from the rotor 20 to the radial outside, thereby cooling the stator 30. The oil O that reaches the stator 30 removes heat from the stator 30 and drips downward, moving from the lower area in the motor chamber 81 to the lower area (oil reservoir P) of the gear chamber 82.

[0030] A pump 96 and a cooler 97 are provided in the path of the second oil passage 92. In the second oil passage 92, the oil O is sucked up from the oil reservoir P by the pump 96 and cooled by the cooler 97, and is supplied to the motor 2 from the upper side of the motor 2. The oil O supplied to the motor 2 removes heat from the stator 30 and drips downward, moving from the lower area in the motor chamber 81 to the lower area (oil reservoir P) of the gear chamber 82.

[0031] The pump 96 is an electrically driven electric pump. The amount of oil O supplied to the motor 2 by the pump 96 is appropriately controlled according to the driving state of the motor 2. Therefore, when the motor 2 is driven for a long time or a higher output is required, the temperature of the motor 2 increases, and the driving output of the pump 96 is increased to increase the amount of oil O supplied to the motor 2.

[0032] The cooler 97 is provided on the installation surface 61b provided on the peripheral wall portion 61a of the housing 6. The cooler 97 has an opposing surface 97a opposed to the installation surface 61b. The cooler 97 cools the oil O passing through the second oil passage 92. The cooler 97 is connected to the water passage 70 through which the cooling water W supplied from the radiator passes. Heat exchange is performed between the oil O passing through the inside of the cooler 97 and the cooling water W. That is, the cooler 97 cools the oil O using the cooling water W.

[0033] <Internal oil and water passages provided in the housing>

[0034] Figure 2 This is a sagittal view of the motor unit 1 viewed from the normal direction ND of the installation surface 61b. Figure 3 is along Figure 2 A cross-sectional view of the motor unit 1 taken along line III-III.

[0035] like Figure 2As shown, the motor housing portion 61 of the housing 6 is provided with an internal oil passage 99 and an internal water passage 79. The internal oil passage 99 is a part of the second oil passage 92, and the oil O flows therethrough. The internal water passage 79 is a part of the water passage 70, and the cooling water W flows therethrough. The internal oil passage 99 and the internal water passage 79 are formed by drilling holes in the peripheral wall portion 61a of the housing 6.

[0036] The cooler 97 is provided with oil inlets 94a and 94b connected to one end of the internal oil passage 99 and cooling water inlets 95a and 95b connected to one end of the internal water passage 79 on the facing surface 97a. The oil inlets 94a and 94b include an oil inlet 94a and an oil outlet 94b. The cooling water inlets 95a and 95b include a cooling water inlet 95a and a cooling water outlet 95b.

[0037] The oil introduction port 94a and the oil discharge port 94b are connected to the internal oil passage 99. The oil introduction port 94a introduces the oil O into the cooler 97. The oil discharge port 94b discharges the oil O from the cooler 97.

[0038] The cooling water inlet 95a and the cooling water outlet 95b are connected to the internal water channel 79. The cooling water inlet 95a introduces the cooling water W into the cooler 97. The cooling water outlet 95b discharges the cooling water W from the cooler 97.

[0039] An oil passage 94 in the cooler connected from an oil inlet 94a to an oil outlet 94b and a water passage 95 in the cooler connected from a cooling water inlet 95a to a cooling water outlet 95b are provided in the cooler 97. In the cooler 97, heat exchange is performed between the oil O and the cooling water W, thereby cooling the oil O, which flows in the oil passage 94 in the cooler, and the cooling water W flows in the water passage 95 in the cooler.

[0040] The internal oil passage 99 includes an oil introduction passage 11 that guides the oil O to the cooler 97 , and an oil discharge passage 13 through which the oil O discharged from the cooler 97 flows.

[0041] The oil inlet passage 11 has a first oil passage opening (oil passage opening) 11a and a first oil passage processing hole (oil passage processing hole) 11b. The first oil passage opening 11a extends in the normal direction and opens to the setting surface 61b. In addition, the first oil passage opening 11a is opened opposite to the oil inlet port 94a of the cooler 97. The first oil passage processing hole 11b is connected to the first oil passage opening. The first oil passage processing hole 11b extends linearly along the setting surface 61b. The first oil passage processing hole 11b is connected to the pump 96 on the upstream side of the internal oil passage 99.

[0042] The oil discharge passage 13 has a second oil passage opening (oil passage opening) 13a and a second oil passage machining hole (oil passage machining hole) 13b. The second oil passage opening 13a extends in the normal direction and opens to the setting surface 61b. In addition, the second oil passage opening 13a is opened opposite to the oil discharge port 94b of the cooler 97. The second oil passage machining hole 13b is connected to the second oil passage opening. The second oil passage machining hole 13b extends linearly along the setting surface 61b. The opening of the second oil passage machining hole 13b is closed by a cover 69b. In addition, the second oil passage machining hole 13b is connected to other machining holes (the fifth machining hole 13c) on the downstream side of the internal oil passage 99. The oil O flows in the internal oil passage 99 in the order of the second oil passage machining hole 13b and the fifth machining hole 13c, and is provided to the motor 2 from the upper side, thereby cooling the motor 2.

[0043] The internal water channel 79 includes a cooling water introduction channel 14 that guides the cooling water W to the cooler 97 , and a cooling water discharge channel 12 through which the cooling water W discharged from the cooler 97 flows.

[0044] The cooling water inlet passage 14 has a second water channel opening (water channel opening) 14a and a second water channel processing hole (water channel processing hole) 14b. The second water channel opening 14a extends in the normal direction and opens to the setting surface 61b. In addition, the second water channel opening 14a is opened opposite to the cooling water inlet 95a of the cooler 97. The second water channel processing hole 14b is connected to the second water channel opening. The second water channel processing hole 14b extends linearly along the setting surface 61b. The opening of the second water channel processing hole 14b is connected to the piping of the water channel 70.

[0045] The cooling water discharge passage 12 has a first water channel opening (water channel opening) 12a and a first water channel processing hole (water channel processing hole) 12b. The first water channel opening 12a extends in the normal direction and opens to the setting surface 61b. In addition, the first water channel opening 12a is opened opposite to the cooling water discharge port 95b of the cooler 97. The first water channel processing hole 12b is connected to the first water channel opening. The first water channel processing hole 12b extends linearly along the setting surface 61b. The opening of the first water channel processing hole 12b is connected to the piping of the water channel 70.

[0046] The first oil passage opening 11a, the first water passage opening 12a, the second oil passage opening 13a, and the second water passage opening 14a are arranged in a rectangular shape on the installation surface 61b. The first oil passage opening 11a and the second oil passage opening 13a, which constitute a part of the internal oil passage 99, are arranged diagonally on the installation surface 61b. Similarly, the first water passage opening 12a and the second water passage opening 14a, which constitute a part of the internal water passage 79, are arranged diagonally on the installation surface 61b.

[0047] The first oil channel processing hole 11b, the first water channel processing hole 12b, the second oil channel processing hole 13b, and the second water channel processing hole 14b are formed by drilling the housing 6 using a cutting tool (e.g., a drill). In the present embodiment, the inner diameters of the first oil channel processing hole 11b, the first water channel processing hole 12b, the second oil channel processing hole 13b, and the second water channel processing hole 14b are consistent with each other. This is because the first oil channel processing hole 11b, the first water channel processing hole 12b, the second oil channel processing hole 13b, and the second water channel processing hole 14b are processed by a general-purpose cutting tool.

[0048] Here, the focus is on the first oil channel processed hole 11b and the first water channel processed hole 12b among the plurality of processed holes. In this embodiment, the first oil channel processed hole 11b and the first water channel processed hole 12b are arranged at different positions when viewed from the normal direction ND of the installation surface 61b.

[0049] The normal direction ND of the setting surface 61b is a direction along the thickness direction of the peripheral wall portion 61a of the housing 6. That is, the peripheral wall portion 61a is thin-walled in the normal direction ND of the setting surface 61b. When a plurality of processing holes overlap each other when viewed from the normal direction ND of the setting surface 61b, it is necessary to cross-arrange the processing holes within the range of the wall thickness of the peripheral wall portion 61a, and the processing holes are inevitably close to each other. In this case, if a cavity caused by die-casting is generated inside the peripheral wall portion 61a, it is possible that the processing holes are connected to each other through the cavity.

[0050] In view of this, according to the present embodiment, when viewed from the normal direction ND of the installation surface 61b, the first oil channel processing hole 11b and the first water channel processing hole 12b do not overlap each other. Therefore, the first oil channel processing hole 11b and the first water channel processing hole 12b can be sufficiently separated and arranged, and even if a cavity is generated inside the peripheral wall portion 61a, the first oil channel processing hole 11b and the first water channel processing hole 12b can be prevented from being connected. As a result, the oil O flowing in the first oil channel processing hole 11b and the cooling water W flowing in the first water channel processing hole 12b can be prevented from mixing.

[0051] In addition, here, the positional relationship when viewed from the normal direction ND is described with attention to the first oil channel processing hole 11b and the first water channel processing hole 12b. However, for any combination of the oil channel processing holes 11b, 13b and the water channel processing holes 12b, 14b, as long as the oil channel processing holes and the water channel processing holes satisfy the above relationship, the connection between the internal oil channel 99 and the internal water channel 79 caused by the cavity can be suppressed.

[0052] In this embodiment, when viewed from the normal direction ND of the installation surface 61b, the first oil channel processing hole 11b and the first water channel processing hole 12b extend toward opposite sides. More specifically, the first oil channel processing hole 11b extends from the installation surface 61b toward Figure 2 The first water channel processing hole 12b extends from the setting surface 61b toward Figure 2 . It extends to the lower side of the paper. Therefore, it is possible to more reliably suppress the first oil circuit processing hole 11b and the first water circuit processing hole 12b from being connected via the cavity. In addition, as described above, the first oil circuit processing hole 11b and the first water circuit processing hole 12b are formed by punching using a cutting tool. Therefore, by setting the approach direction of the cutting tool to the opposite side relative to the peripheral wall portion 61a, the first oil circuit processing hole 11b and the first water circuit processing hole 12b extending toward opposite sides can be formed respectively. In addition, here, the case where the first oil circuit processing hole 11b and the first water circuit processing hole 12b extend toward opposite sides to each other is illustrated. However, it is preferred that the oil circuit processing holes and the water circuit processing holes that do not overlap each other when viewed from the normal direction ND in the combination of the oil circuit processing holes 11b, 13b and the water circuit processing holes 12b, 14b extend toward opposite sides to each other, and this combination is not limited to the present embodiment.

[0053] A pump 96 is disposed in the path of the internal oil passage 99. The pump 96 pumps the oil O in the internal oil passage 99. The pump 96 is housed in a pump housing portion 66 provided in the housing 6. The pump housing portion 66 has a cylindrical shape surrounding the housing 6.

[0054] The pump 96 has a pump motor 96m, a pump mechanism 96p, a suction port 96a, and a discharge port 96b. Figure 2 The pump mechanism 96p schematically shown is, for example, a trochoidal pump that rotates by meshing an external gear with an internal gear. In this case, the pump motor 96m rotates the internal gear of the pump mechanism 96p. In addition, the gap between the internal gear and the external gear of the pump mechanism 96p is connected to the suction port 96a and the discharge port 96b.

[0055] The suction port 96a opens to the oil reservoir P of the gear chamber 82. The pump 96 sucks the oil O from the oil reservoir P. On the other hand, the discharge port 96b is connected to the internal oil passage 99. The discharge port 96b is formed together with the first oil passage processing hole 11b. The pump 96 pressurizes the oil O to the internal oil passage 99 from the discharge port 96b.

[0056] like Figure 3As shown, the first oil path processing hole 11b extends through the pump housing portion 66. The first oil path processing hole 11b is bored by approaching the cutting tool from the side of the pump housing portion 66. Therefore, the first oil path processing hole 11b opens at the side of the pump housing portion 66. Thus, the first oil path processing hole 11b can be set to extend to the opposite side of the first water path processing hole 12b, and the first oil path processing hole 11b can be arranged separately from the first water path processing hole 12b.

[0057] In the present embodiment, the housing 6 has a cap 69 that closes the opening 11c on the tool insertion side of the first oil passage processing hole 11b. Thus, the opening 11c as the inlet of the cutting tool can be closed, and the oil O can be effectively pumped to the internal oil passage 99 at a higher pressure by the pump 96. In addition, in the present embodiment, the opening 11c is internally threaded in order to screw the cap 69 in.

[0058] Next, in addition to the first oil channel processing hole 11b and the first water channel processing hole 12b, the second oil channel processing hole 13b and the second water channel processing hole 14b are also focused on. Figure 2 As shown, in the present embodiment, when viewed from the normal direction ND of the setting surface 61b, the first oil path processing hole 11b, the first water path processing hole 12b, the second oil path processing hole 13b, and the second water path processing hole 14b are arranged at different positions. Therefore, even when a cavity is generated inside the peripheral wall portion 61a, it is possible to suppress the first oil path processing hole 11b, the first water path processing hole 12b, the second oil path processing hole 13b, and the second water path processing hole 14b from being connected. As a result, it is possible to suppress the mixing of the oil O flowing in each processing hole with the cooling water W, and the mixing of the oil O with each other and the mixing of the cooling water W with each other, and it is possible to improve the reliability of the cooling of the motor 2 by the cooler 97. In addition, according to the present embodiment, when viewed from the normal direction ND, the first oil path processing hole 11b and the second oil path processing hole 13b are arranged at different positions from the water path processing holes 12b and 14b. In addition, when viewed from the normal direction ND, the first water channel processing hole 12b and the second water channel processing hole 14b are arranged at different positions from the oil channel processing holes 11b and 13b. Therefore, the internal oil channel 99 and the internal water channel 79 can be prevented from being connected due to the cavity, and the mixing of the oil O and the cooling water W can be suppressed.

[0059] like Figure 3As shown, in the present embodiment, in the normal direction ND of the setting surface 61b, the position of the first oil channel processing hole 11b, the position of the first water channel processing hole 12b, the position of the second oil channel processing hole 13b, and the position of the second water channel processing hole 14b overlap with each other. That is, in the thickness direction of the peripheral wall portion 61a, the first oil channel processing hole 11b, the first water channel processing hole 12b, the second oil channel processing hole 13b, and the second water channel processing hole 14b are arranged at the same position. Therefore, the thickness dimension of the peripheral wall portion 61a can be reduced, and as a result, the radial dimension of the motor unit 1 can be miniaturized.

[0060] The embodiments and modifications of the present invention have been described above, and the various structures and combinations of the embodiments are examples, and addition, omission, substitution and other changes of structures can be made without departing from the gist of the present invention. In addition, the present invention is not limited to the embodiments.

Claims

1. A motor unit, characterized in that: The motor unit has: a motor having a shaft that rotates about a motor axis; a housing for housing the motor; oil contained in the housing; and an oil cooler, which cools the oil using cooling water, The housing is provided with a setting surface for setting the oil cooler, an internal oil passage for the oil to flow, and an internal water passage for the cooling water to flow, wherein the setting surface is a surface facing radially outward of the motor axis. An oil port connected to one end of the internal oil passage and a cooling water port connected to one end of the internal water passage are provided on an opposing surface of the oil cooler that is opposite to the setting surface. The internal oil circuit has: an oil passage opening, which is opposite to the oil port and opens toward the installation surface; and an oil passage processing hole connected to the oil passage opening and extending linearly along the setting surface, The internal waterway has: an opening for a water channel, which is opposite to the cooling water port and opens toward the installation surface; as well as a processing hole for water channel, which is connected to the opening for water channel and extends linearly along the setting surface, The oil channel processed hole and the water channel processed hole are arranged at different positions from each other when viewed in the normal direction of the installation surface.

2. The motor unit according to claim 1, characterized in that The oil channel processing hole and the water channel processing hole extend toward opposite sides to each other when viewed from the normal direction.

3. The motor unit according to claim 2, characterized in that In the normal direction, the position of the oil channel processing hole and the position of the water channel processing hole overlap with each other.

4. The motor unit according to any one of claims 1 to 3, characterized in that The motor unit further includes a pump for pressurizing the oil in the internal oil passage. The housing has a pump housing portion for housing the pump. The oil passage processed hole extends through the pump housing portion.

5. The motor unit according to claim 4, characterized in that The oil passage processing hole opens on the side of the pump housing portion. The housing has a cover that closes an opening of the oil passage processing hole on a side surface of the pump housing portion.

6. The motor unit according to claim 1, characterized in that On a surface of the oil cooler opposite to the installation surface, The oil port comprises: an oil introduction port for introducing the oil into the oil cooler; and an oil drain port for draining the oil from the oil cooler, The internal oil circuit has: a first oil passage opening, which is opposite to the oil introduction port and opens on the installation surface; a first oil passage processing hole connected to the first oil passage opening and extending linearly along the installation surface; a second oil passage opening, which is opposite to the oil discharge port and opens on the installation surface; as well as a second oil passage processing hole connected to the second oil passage opening and extending linearly along the setting surface; When viewed from the normal direction, the first oil channel processed hole and the second oil channel processed hole are arranged at positions different from the water channel processed hole.

7. The motor unit according to claim 1, characterized in that On a surface of the oil cooler opposite to the installation surface, The cooling water inlet comprises: a cooling water inlet for introducing the cooling water into the oil cooler; and a cooling water discharge port for discharging the cooling water from the oil cooler, The internal waterway has: a first water channel opening, which is opposite to the cooling water inlet and opens toward the installation surface; a first water channel processing hole connected to the first water channel opening and extending linearly along the installation surface; a second water channel opening, which is opposite to the cooling water discharge port and opens toward the installation surface; as well as a second water channel processing hole connected to the second water channel opening and extending linearly along the installation surface; When viewed from the normal direction, the first water channel processing hole and the second water channel processing hole are arranged at positions different from the oil channel processing hole.

8. The motor unit according to claim 1, characterized in that In the normal direction, the position of the oil channel processing hole and the position of the water channel processing hole overlap with each other.

9. The motor unit according to claim 1, characterized in that The housing is a die-cast product.

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