JP2004357458A - Dynamo electric motor cooling system for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently cool oil for cooling a vehicle motor. <P>SOLUTION: This motor cooling system for a vehicle 10 has the motor for vehicle 20, an oil circulation passage 40 for circulating oil for cooling, a power transmission device for vehicle 60, and a water-cooled jacket 70 for cooling the oil and provided at a part of an outer periphery of the power transmission device for the vehicle 60. A rotating portion 64, such as a gear, is provided at an inner portion of a case 62 of the power transmission device for the vehicle 60, and the oil 50 to be used for lubrication for the rotating portion flows at a higher speed by stirring up with the rotating portion 64. The water-cooled jacket 70 is attached at a position corresponding to the stirring-up portion. A part of the oil circulation passage can be passed in the water-cooled jacket for the motor case for cooling the oil. A part of the oil circulation passage may be passed through an oil-cooled device, in which high pressure side liquified refrigerant of a vehicle air conditioner passes. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a motor cooling system for a vehicle, and more particularly to a motor cooling system for a vehicle that cools the inside of the motor with oil and cools oil whose temperature has increased.
[0002]
[Prior art]
Lubricating oil is used for cooling a motor for a vehicle, particularly for cooling a coil end of a stator inside the motor. For example, in Patent Document 1, with respect to an electric motor including a housing provided with air-cooling radiating fins on the outer periphery, lubricating oil is introduced as a refrigerant into a rotating shaft of the electric motor, and refrigerant is ejected from the rotating shaft by rotating the rotor. Discharging lubricating oil from a nozzle is disclosed. In this case, the lubricating oil jetted from the refrigerant jet nozzle becomes a mist, is cooled by touching the inside air of the housing, and cools the stator.
[0003]
Further, in Patent Document 2, a motor case is formed as a double wall, an oil passage chamber is provided above the case, an oil reservoir is provided below, and a finned plate and an outer cover are attached so as to cover an opening of the oil reservoir. A motor is disclosed in which a water cooling chamber is provided between the motor and the cover. In this case, oil flows down from the oil passage chamber to the stator coil by the oil pump, reaches an oil reservoir, and is cooled by a water cooling chamber dedicated to oil cooling. Part of the oil is also supplied to a reduction gear.
[0004]
Patent Literature 3 discloses a method of cooling a rotor inside a rotor yoke close to a permanent magnet in order to cool a permanent magnet of a rotor and to quickly raise a temperature of lubricating oil by heat generation of the permanent magnet to reduce friction loss of a power transmission device. It is disclosed that an oil passage is provided and lubricating oil for a power transmission device is circulated by an oil pump. In this case, a configuration is shown in which a water cooling jacket is provided on the motor housing to cool the stator from outside the motor housing, but the lubricating oil for cooling the rotor is rather actively used to increase its temperature.
[0005]
As a simple oil cooling means for a vehicle, a configuration in which an air-cooling fin is provided on the lower surface of an oil pan in Patent Literature 4 is described. In Patent Literature 5, a part of an outer wall of an oil circulation pipe is provided in a cylinder block cooling water jacket. Patent Literature 6 discloses an oil cooler in which heat can be exchanged between a pipe through which oil passes and a part of a low-pressure side pipe of an air conditioner of an automobile. However, it is not directly used for cooling an electric motor.
[0006]
[Patent Document 1]
JP-A-7-288950 [Patent Document 2]
JP 2001-251814 A [Patent Document 3]
JP 2001-190047 [Patent Document 4]
JP-A-63-186914 [Patent Document 5]
Japanese Utility Model Laid-Open No. 1-88009 [Patent Document 6]
Japanese Utility Model Laid-Open No. 5-8250
[Problems to be solved by the invention]
When oil for a power transmission device is used for cooling an electric motor for a vehicle, if the oil for cooling is small, the temperature of the oil itself increases due to heat received from a stator or a rotor, and the cooling performance may be reduced. . Further, when the power transmission device is rotating at high speed, gear loss, that is, gear heat generation increases, and the oil temperature increases, and the cooling performance may further decrease. Therefore, in order to exhibit the predetermined performance of the vehicle electric motor, the size of the vehicle electric motor is increased, which hinders speeding up.
[0008]
Therefore, in order to improve the cooling performance of a motor for a vehicle, it is desired to sufficiently cool the oil. However, the oil has a lower heat transfer coefficient than water, and from the viewpoint of efficiently cooling the oil, the oil of the related art is used. Problems still remain in the cooling method or cooling means. For example, the cooling of oil in Patent Document 1 depends on air-cooling radiating fins provided in a motor housing, so that the cooling performance cannot be said to be sufficient, and the size and speed of a motor for a vehicle cannot be reduced. In addition, since cooling of oil in Patent Document 2 is performed by providing a dedicated water cooling chamber, a separate motor housing structure is required for each motor such as an oil reservoir, a finned plate and a cover on the outside thereof, which increases the cost. This hinders downsizing of the motor for vehicles. In this case, if the motor housing also has a cooling mechanism, the motor is provided with a plurality of cooling mechanisms, and the efficiency of the cooling system as a whole is not necessarily good.
[0009]
Patent Literature 3 does not disclose a method for cooling oil, and the oil cooling method disclosed in Patent Literatures 4 to 6 has a relationship with cooling of an electric motor, particularly cooling of a coil end and the like inside the electric motor. Not disclosed.
[0010]
An object of the present invention is to provide a vehicle motor cooling system that solves the problems of the prior art and that can improve the cooling performance of a vehicle motor.
[0011]
[Means for Solving the Problems]
To achieve the above object, a vehicular motor cooling system according to the present invention provides a vehicular motor including a motor unit having a rotor and a stator, a motor case accommodating the motor unit, and cooling the motor unit in the motor case. An oil circulation path that circulates oil between the motor case and a heat exchange section that cools the oil, the oil circulation path for the vehicle connected to the motor section. An oil circulation path that circulates oil that has been scooped up and given a speed by a rotating portion in the power transmission device, and a heat exchange portion is provided on the outer periphery of the vehicle power transmission device corresponding to the oil scooping portion. And wherein the scooped oil is cooled by the heat exchange unit.
[0012]
According to the above configuration, the oil that has been scooped up by the rotating portion and given a speed is circulated in the vehicle power transmission device. Further, a heat exchange unit, for example, an air-cooled fin or a water-cooled jacket is provided on the outer periphery of the vehicle power transmission device in correspondence with the internal oil scraping portion. Although the heat transfer coefficient of oil is lower than that of water, oil flows vigorously along the inner wall of the case of the power transmission device for vehicles in the oil-raising portion. Therefore, the heat transfer coefficient between the oil and the inner wall is high. Therefore, by providing the heat exchange section in this portion, efficient oil cooling can be performed, and the cooling performance of the vehicle electric motor can be improved.
[0013]
Further, a motor cooling system for a vehicle according to the present invention includes a motor for a vehicle including a motor unit having a rotor and a stator, and a motor case accommodating the motor unit, and an oil for cooling the motor unit in the motor case. An oil circulation path that circulates between the inside of the case and a heat exchange unit that cools the oil, wherein the oil circulation path guides oil circulated by an oil pump into the motor case. An oil circulation path, wherein the heat exchange section is provided on the outer periphery of the motor case, cools the motor case, and is a heat exchange section in which a part of the oil circulation path passes through the inside, and passes through the heat exchange section. And the oil is cooled. Further, the heat exchange part is a water cooling jacket provided on the outer periphery of the motor case, and a part of an oil circulation path passing through the inside of the heat exchange part is preferably a fin tube having a partition for increasing a heat exchange surface area. .
[0014]
With the above configuration, the oil is circulated using the oil pump, and the oil is also cooled using a heat exchange unit for cooling the motor case, for example, a water cooling jacket provided on the outer periphery of the motor case. In this way, the heat exchange unit provided in the motor case is used not only for cooling the motor case but also for cooling the oil, so that the heat exchange unit such as a water-cooled jacket can be compactly combined as a cooling system for the vehicle electric motor. And the cooling system as a whole can be efficient.
[0015]
Further, a motor cooling system for a vehicle according to the present invention includes a motor for a vehicle including a motor unit having a rotor and a stator, and a motor case accommodating the motor unit, and an oil for cooling the motor unit in the motor case. An oil circulation path that circulates between the inside of the case and a heat exchange unit that cools the oil, wherein the oil circulation path guides oil circulated by an oil pump into the motor case. The oil circulation path, the heat exchange unit is a container that divides and flows the high-pressure side liquid refrigerant liquefied by the condenser to the high-temperature high-pressure vaporized refrigerant pressurized by the compressor of the vehicle air conditioner. It is an oil cooler through which a part of an oil circulation path passes.
[0016]
When oil is cooled by using a refrigerant of an air conditioner for a vehicle, it is possible to vaporize and use a low-pressure side refrigerant having a low temperature (for example, 0 ° C.). growing. With the above configuration, when the oil is circulated using the oil pump and the oil cooler cools the oil, the high-pressure side liquid refrigerant of the vehicle air conditioner is passed through the oil cooler. That is, the high-pressure side liquid refrigerant is still at a temperature (for example, 30-45 ° C.) sufficient to cool oil (for example, at a temperature of 100 ° C.), and does not pass through the compressor. The refrigerant can be returned to the refrigerant circulation path of the air conditioner. Therefore, the whole cooling system of the motor for vehicles can be made efficient.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following, the vehicle electric motor will be described as an induction motor, but may be a vehicle electric motor having a rotor using other permanent magnets. The vehicle electric motor may be used for driving a vehicle, or may be used for other purposes.
[0018]
FIG. 1 is a diagram showing the configuration of a motor cooling system 10 for a vehicle. The motor cooling system 10 for a vehicle is connected to a motor 20 for a vehicle, an oil circulation path 40 for circulating cooling oil, and the motor 20 for a vehicle. And a water cooling jacket 70 provided on a part of the outer periphery of the vehicle power transmission device 60 for oil cooling.
[0019]
The vehicular motor 20 shown in a cross-sectional view in FIG. 1 is a squirrel-cage induction motor whose operation is controlled by a control unit (not shown), and has a function of supplying rotational energy output from the motor to the vehicular power transmission device 60. . The motor 20 for a vehicle includes a motor case 22 that is a cylindrical housing, a bearing 24 provided inside the motor case 22, and a rotation that is supported by the bearing 24 and protrudes outside from an opening at one end of the motor case 22. The motor includes a shaft 26, a rotor 28 fixed to the rotating shaft 26 and rotating integrally with the rotating shaft 26, and a stator 30 that is disposed with a gap from the outer periphery of the rotor 28 and that is attached to the motor case 22. The stator 30 has a coil provided in a slot provided in the stator core, and an end of the coil protrudes outside the stator core as a coil end 32. The motor case 22 is provided with a motor case oil supply port 52 and a motor case oil discharge port 44 for circulating oil for cooling the inside of the motor case 22, especially the coil end 32. The motor case oil supply port 52 may be provided, for example, at a position above the motor case 22 so that the supplied oil 54 flows down the coil end 32 by natural fall.
[0020]
The vehicle power transmission device 60 is a device that incorporates a power transmission element such as a gear, and has a function of converting rotational energy supplied from the vehicle electric motor 20 or the like into a rotational speed and a torque suitable for traveling of the vehicle. FIG. 2 is a partial cross-sectional view of the vehicle power transmission device 60. A rotating part 64 such as a gear is provided inside the case 62, and the oil 50 is used for lubrication. This oil is scooped up by the rotating portion 64 to be given a speed, and flows vigorously along the inner wall of the case 62. The case 62 is provided with a power transmission device oil supply port 46 and a power transmission device oil discharge port 48 for oil circulation.
[0021]
A water cooling jacket 70 is attached to the outside of the case 62 of the vehicle power transmission device 60. The water cooling jacket 70 is formed of a material having good thermal conductivity, for example, aluminum, and is a member through which circulating water is passed, and has a function as a heat exchange unit that transfers heat to the outside by the circulating water. The water cooling jacket 70 includes a housing 72 for holding the circulating cooling water, a cooling water supply port 74 and a cooling water discharge port 76 provided on the housing 72 and connected to a cooling water circulation pump (not shown). As shown in FIG. 1, a plurality of cooling fins or partition walls 78 for increasing the contact area of the cooling water are provided inside the housing 72. The mounting position is a position corresponding to a portion where the oil is scooped on the inner wall of the case 62, and the shape of the housing 72 is formed so as to follow the outer periphery of the portion of the case 62. Further, the outer peripheral surface of the case 62 to which the housing 72 is attached is subjected to processing necessary for tightly attaching the housing 72 to the case 62.
[0022]
The oil circulation path 40 is an oil flow path that connects the inside of the vehicle electric motor 20 and the inside of the vehicle power transmission device 60, and contains oil used for cooling the vehicle electric motor 20 and lubricating the vehicle power transmission device 60. Has the function of circulation. As shown in FIG. 1, the oil circulation path 40 includes: “-the holding portion of the oil 42 at the bottom of the motor case 22 -the motor case oil discharge port 44 -the power transmission device oil supply port 46 -the inside of the vehicle power transmission device 60. A portion for holding the oil 50 at the bottom thereof via the rotating portion 64-a power transmission device oil outlet 48-an oil supply port for the motor case-an oil 54 flowing down the coil end 32 and the like-a portion for holding the oil 42 at the bottom of the motor case -". The oil is scooped up by the rotating portion 64 of the vehicle power transmission device 60 and is given a speed, so that it is not necessary to provide a special oil pump in the oil circulation path 40. Of course, an oil pump can be provided if necessary.
[0023]
As described above, in the oil circulation path 40, the water cooling jacket 70 is provided in the case 62 of the vehicle transmission device 60 corresponding to the oil scooping portion inside the case, so that heat is generated between the oil and the cooling water there. A change is made and the oil is cooled. Although the heat transfer coefficient of the oil is as small as about 1/10 of water, as shown in FIG. 2, the oil is scooped up by the rotating part 64 to be given a speed, and flows vigorously along the case 62. By providing the heat exchange unit, the oil can be efficiently cooled. The heat exchange section may be other than a water-cooled jacket. For example, FIG. 3 shows a state in which air cooling fins 80 are provided outside the case 62 instead of the water cooling jacket.
[0024]
When the motor for a vehicle is provided with a water cooling jacket or the like for cooling the motor case, the oil can be cooled by effectively using a heat exchange unit such as the water cooling jacket. FIG. 4 is a diagram illustrating a vehicle motor cooling system 110 for a vehicle motor having a water cooling jacket. The same elements as those in FIG. 1 are denoted by the same reference numerals, and detailed description will be omitted. The vehicle electric motor 20 is a motor similar to that described with reference to FIG. 1, in which a motor case oil supply port 52 is provided above the motor case 22 and a motor case oil discharge port 44 is provided at the bottom thereof. .
[0025]
The motor case 22 is provided with a water cooling jacket 170 for cooling the motor case 22. The water cooling jacket 170 is formed of a material having good heat conductivity, for example, aluminum, and is a member through which circulating water is passed. The water cooling jacket 170 has a function as a heat exchange unit that transfers heat to the outside by the circulating water. The water cooling jacket 170 includes a housing 172 for holding the circulating cooling water, a cooling water supply port 174 and a cooling water discharge port 176 provided in the housing 172 and connected to a cooling water circulation pump (not shown).
[0026]
An oil pump 180 for circulating oil is provided in an oil circulation path 140 for circulating oil for cooling the motor 20 for a vehicle. As the oil for cooling the vehicle electric motor, the whole or a part of the lubricating oil used for the vehicle equipment can be used. As shown in FIG. 4, the oil circulation path 140 flows down the “-holding portion of the oil 42 at the bottom of the motor case 22 -the motor case oil discharge port 44 -the oil pump 180 -the motor case oil supply port -the coil end 32 and the like. Oil 54-a holding portion of the oil 42 at the bottom of the motor case 22-".
[0027]
A part of the oil circulation path 140 passes through the inside of the water cooling jacket 170. FIGS. 5 and 6 are a side sectional view and a plan sectional view of the water cooling jacket 170. Inside the water cooling jacket 170, water cooling fins or partition walls 178 for increasing the contact area between the cooling water and the housing 172 are provided in parallel at intervals of, for example, about 5 mm, and the cooling water is guided by the partition walls 178. Then, it flows meandering in the housing 172. The oil circulation path 140 is disposed in a cooling water flow path 179 between the partition walls 178, a flow path having a width of 5 mm in the above example. More specifically, as shown in FIG. 5, the oil circulation path 140 enters the inside of the housing 172 from the cooling inlet 142, and the cooling partial circulation path 144 branched in two directions connects the cooling water flow path 179 inside the housing 172. As described above, the cooling outlet 144 exits the housing 172 and reaches the two motor case oil supply ports 52. The number of branches of the cooling partial circulation path 144 can be increased or decreased according to the number of the motor case oil supply ports 52.
[0028]
As the cooling partial circulation path 144, a fin tube having a partition for increasing a heat exchange surface area is used. As the fin tube, a flat fin tube used for a radiator of a vehicle can be used. As shown in FIG. 6, the flat fin tube has a configuration in which a plurality of flat pipes are stacked, so that the contact area with the oil flowing inside the flat fin tube and the contact area with the cooling water flowing outside the flat fin tube are increased. Thus, oil having a low heat transfer coefficient can be efficiently cooled. As described above, since the cooling of the motor case and the cooling of the oil can be constituted by one water-cooling jacket, the cooling system of the vehicle electric motor can be efficiently made compact.
[0029]
Cooling of the oil can also be performed using a refrigerant for a vehicle air conditioner. FIG. 7 is a diagram showing a motor cooling system 210 for a vehicle that divides a part of the refrigerant from a refrigerant circulation cycle of an air conditioner for a vehicle and uses the refrigerant for oil cooling. The same elements as those in FIG. 1 are denoted by the same reference numerals, and detailed description will be omitted. The vehicle electric motor 20 is a motor similar to that described with reference to FIG. 1, in which a motor case oil supply port 52 is provided above the motor case 22 and a motor case oil discharge port 44 is provided at the bottom thereof. .
[0030]
An oil circulation path 240 that circulates oil for cooling the vehicle motor 20 is provided with an oil pump 280 for circulating oil and an oil cooler 270 for cooling oil. As the oil for cooling the vehicle electric motor, the whole or a part of the lubricating oil used for the vehicle equipment can be used. As shown in FIG. 7, the oil circulation path 240 includes: “-the holding portion of the oil 42 at the bottom of the motor case 22 -the motor case oil outlet 44 -the oil pump 280 -the oil cooler 270 -the motor case oil supply port-the coil. An oil 54 flowing down the end 32 and the like-a holding portion of the oil 42 at the bottom of the motor case 22- "is provided.
[0031]
The oil cooler 270 is a container through which the refrigerant of the vehicle air conditioner flows, and serves as a heat exchange unit that carries out the heat of the oil to the outside by the refrigerant by passing a part of the oil circulation path 240 through the inside. It has the function of The oil cooler 270 includes a cooling case 272 that holds the refrigerant diverted from the refrigerant circulation cycle of the vehicle air conditioner, a refrigerant supply port 274 provided in the cooling case 272, and a refrigerant discharge port 276. The cooling partial circulation path 244 that passes through the oil cooler 270 in a part of the oil circulation path 240 increases the contact area with the refrigerant by the meandering arrangement shown in FIG.
[0032]
In FIG. 7, the refrigerant circulation cycle of the vehicle air conditioner includes a receiver 220 containing a liquid refrigerant, a refrigerant vaporization unit including an electromagnetic valve 222, an expansion valve 224, an evaporator 226, and the like, and compresses the vaporized refrigerant to a high temperature and a high pressure. And a condenser 230 for liquefying a high-temperature and high-pressure vaporized refrigerant. The condenser 230 is provided with a cooling fan 232. The refrigerant is circulated between these devices by the refrigerant circulation path 234, and the liquefied refrigerant is partially vaporized by opening the solenoid valve 222 and the expansion valve 224, and is vaporized almost 100% by the evaporator 226 to about 0 ° C. It becomes a refrigerant. By using this, air conditioning of each part of the vehicle can be performed. The low-temperature vaporized refrigerant is converted into a high-temperature and high-pressure gas by the compressor, returned to liquid again in the condenser 230, converted into a liquefied refrigerant at about 30-45 ° C., and stored in the receiver 220.
[0033]
For cooling the oil, the refrigerant circulation path 234 is diverted, flows through the oil cooler 270 as the oil cooling path 235, and then returns to the refrigerant circulation path 234 and joins again. The branch of the oil cooling path 235 from the refrigerant circulation path 234 is performed in the refrigerant circulation path 234 between the receiver 220 and the solenoid valve 222. The junction of the oil cooling path 235 is performed between the compressor 228 and the condenser 230. In the refrigerant circulation path 234. That is, the refrigerant diverted to the oil cooling path 235 has a temperature of about 30 to 45 ° C. in the above example. The oil cooling path 235 is provided with a small-capacity liquid pump 236 for flowing the liquefied refrigerant, and a check valve 238.
[0034]
As described above, the passage of the high-pressure side liquid refrigerant of the vehicle air conditioner through the oil cooler has the following advantages. That is, the high-pressure side liquid refrigerant still has a sufficient temperature (for example, 30-45 ° C.) for cooling oil (for example, a temperature of 100 ° C.), and has a high heat transfer rate due to boiling heat transfer. The vaporized refrigerant in the oil cooling passage 235 does not enter the compressor of the vehicle air conditioner, so that a direct load is not required. If the low-pressure side refrigerant (refrigerant cooled through the expansion valve) of the vehicle air conditioner is used, the load on the compressor increases correspondingly, and a larger compressor is required. For example, the work of the liquid pump only needs to be a few watts of the order of the pressure loss of the piping of the oil cooling passage, while the work of the compressor for liquefaction requires about several hundred watts. In this manner, the oil can be effectively cooled without applying too much load to the vehicle air conditioner, and the entire cooling system for the vehicle electric motor can be made efficient.
[0035]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the motor cooling system for vehicles which concerns on this invention, it becomes possible to cool the oil which cools a motor for vehicles efficiently.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a vehicle electric motor cooling system according to an embodiment of the present invention.
FIG. 2 is a partial cross-sectional view of a vehicle power transmission device in the vehicle electric motor cooling system according to the embodiment of the present invention.
FIG. 3 is a diagram showing an example in which air-cooled fins are used instead of the water-cooled jacket of FIG.
FIG. 4 is a diagram showing a configuration of a vehicle electric motor cooling system according to another embodiment.
FIG. 5 is a side sectional view of a water cooling jacket in a motor cooling system for a vehicle according to another embodiment.
FIG. 6 is a plan sectional view of a water cooling jacket in a vehicle electric motor cooling system according to another embodiment.
FIG. 7 is a diagram showing a configuration of a vehicle electric motor cooling system according to still another embodiment.
[Explanation of symbols]
10, 110, 210 Vehicle electric motor cooling system, 20 Vehicle electric motor, 22 Motor case, 28 Rotor, 30 Stator, 32 Coil end, 40, 140, 240 Oil circulation path, 42, 50, 54 Oil, 60 Vehicle power Transmission device, 62 cases, 64 rotating parts, 70,170 water cooling jacket, 80 air cooling fins, 144,244 cooling partial circuit, 180,280 oil pump, 226 evaporator, 228 compressor, 230 condenser, 234 refrigerant circuit , 235 oil cooling path, 270 oil cooler.

Claims (4)

A motor for a vehicle including a motor unit having a rotor and a stator, and a motor case accommodating the motor unit,
An oil circulation path for circulating oil for cooling the motor unit in the motor case between the inside of the motor case and a heat exchange unit for cooling the oil,
A motor cooling system for a vehicle comprising:
The oil circulation path is an oil circulation path that circulates oil that has been lifted and given a speed by a rotating part in a vehicle power transmission device connected to the motor unit,
The heat exchanging section is a heat exchanging section provided on the outer periphery of the vehicle power transmission device corresponding to the oil scooping section, wherein the scooped oil is cooled by the heat exchanging section. system. A motor for a vehicle including a motor unit having a rotor and a stator, and a motor case accommodating the motor unit,
An oil circulation path for circulating oil for cooling the motor unit in the motor case between the inside of the motor case and a heat exchange unit for cooling the oil,
A motor cooling system for a vehicle comprising:
The oil circulation path is an oil circulation path that guides oil circulated by the oil pump into the motor case,
The heat exchange part is provided on the outer periphery of the motor case, and is a heat exchange part that cools the motor case and through which a part of the oil circulation path passes.The oil is cooled by passing through the heat exchange part. A motor cooling system for a vehicle, comprising: The motor cooling system for a vehicle according to claim 2,
The heat exchange section is a water cooling jacket provided on the outer periphery of the motor case,
A motor cooling system for a vehicle, wherein a part of an oil circulation passage passing through the inside of the heat exchange part is a fin tube having a partition for increasing a heat exchange surface area. A motor for a vehicle including a motor unit having a rotor and a stator, and a motor case accommodating the motor unit,
An oil circulation path for circulating oil for cooling the motor unit in the motor case between the inside of the motor case and a heat exchange unit for cooling the oil,
A motor cooling system for a vehicle comprising:
The oil circulation path is an oil circulation path that guides oil circulated by the oil pump into the motor case,
The heat exchange section is a container that circulates a high-pressure side liquid refrigerant that is liquefied by a condenser and flows a high-temperature and high-pressure vaporized refrigerant that is pressurized by a compressor of a vehicle air conditioner, and the inside thereof is an oil circulation path. An electric motor cooling system for a vehicle, which is an oil cooler partially passing through.

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