JP2019170030A - Motor cooling system - Google Patents

Abstract

To cool a motor properly.SOLUTION: The motor cooling system includes: a motor including a case, a stator fixed to the case, and a rotor rotatably provided to the stator; and a cooling pipe, provided by extending in an axial direction of the motor above the motor inside the case, defining inside a flow path through which a coolant flows and having a discharge port formed by penetrating laterally from a flow path. An outer periphery of the stator of the motor is provided with a protrusion that protrudes in a radial direction of the motor. The cooling pipe is rotatably provided with respect to the case and is further provided with a rotary mechanism for rotating the cooling pipe.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a cooling system for a motor.

  2. Description of the Related Art Conventionally, in various devices, a motor cooling system for cooling a motor provided in the device has been widely used. For example, as disclosed in Patent Document 1, a cooling system including a cooling pipe provided above a motor inside a case that houses the motor is used. In such a cooling system, specifically, a flow path through which a coolant such as oil flows is defined inside the cooling pipe, and the cooling pipe is formed to penetrate from the flow path to the side. It has a discharge port. The cooling of the motor is performed by supplying the cooling liquid to the flow path of the cooling pipe and discharging the cooling liquid from the discharge port toward the outer peripheral portion of the motor. Thereby, it can suppress that a motor breaks with heat. In addition, when control for limiting the output of the motor is performed when the motor becomes relatively high in temperature, it is possible to suppress frequent control for limiting the output of the motor.

JP 2014-158400 A

  However, in the conventional motor cooling system, it has not been sufficient to properly cool the motor. For example, in the conventional cooling system as disclosed in Patent Document 1, it is difficult to sufficiently distribute the coolant to each part of the outer peripheral portion of the motor, resulting in a locally high temperature in the motor. There was a case where a new part occurred.

  Specifically, a protruding portion that protrudes in the radial direction of the motor is provided on the outer peripheral portion of the stator of the motor, for example, as a portion through which a bolt that fixes the motor to the case is inserted. The coolant discharged from the cooling pipe flows downward along the outer periphery of the motor and is supplied to each part of the outer periphery of the motor, but may be blocked by the protrusion of the motor. Therefore, it becomes difficult for the coolant to reach the portion below the protruding portion in the outer peripheral portion of the motor. Thereby, the part below the protrusion part in the outer peripheral part of the motor is not sufficiently cooled, and the temperature tends to be locally high.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a new and improved motor cooling system capable of appropriately cooling a motor. It is in.

  In order to solve the above-described problems, according to an aspect of the present invention, a case, a motor fixed to the case, a motor including a rotor that is rotatably provided to the stator, and the inside of the case A cooling pipe provided extending in the axial direction of the motor above the motor, defining a flow path through which a coolant flows therein, and having a discharge port formed penetrating laterally from the flow path; A protrusion that protrudes in a radial direction of the motor is provided on an outer peripheral portion of the stator of the motor, and the cooling pipe is provided to be rotatable with respect to the case, and rotates the cooling pipe. A motor cooling system is further provided, further comprising a rotating mechanism.

  The rotating mechanism may include a turbine that is provided in the flow path of the cooling pipe and that is rotationally driven integrally with the cooling pipe by the coolant flowing in the flow path.

  The coolant may be supplied to the flow path from one side of the cooling pipe, and the turbine may be disposed on one side of the cooling pipe in the flow path.

  A plurality of the discharge ports may be formed with an interval in the axial direction of the cooling pipe, and the plurality of discharge ports may be shifted in the circumferential direction of the cooling pipe.

  As described above, according to the present invention, the motor can be appropriately cooled.

It is front sectional drawing which shows schematic structure of the cooling system which concerns on embodiment of this invention. It is AA sectional drawing of FIG. 1 which shows schematic structure of the cooling system which concerns on the same embodiment. It is BB sectional drawing of FIG. 1 which shows schematic structure of the cooling system which concerns on the same embodiment. It is a figure which shows typically a mode that the cooling pipe which concerns on the embodiment rotates integrally with a turbine. It is a figure which shows the example of arrangement | positioning of the discharge outlet about the circumferential direction of the said cooling pipe in the cooling pipe which concerns on the same embodiment. It is a figure which shows typically the path | route of the oil discharged from the cooling pipe in the cooling system which concerns on a reference example. It is a figure which shows typically the path | route of the oil discharged from the cooling pipe in the cooling system which concerns on the embodiment.

  Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

<1. Configuration of cooling system>
First, with reference to FIGS. 1-5, the structure of the cooling system 1 which concerns on embodiment of this invention is demonstrated.

  FIG. 1 is a front sectional view showing a schematic configuration of a cooling system 1 according to the present embodiment. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 3 is a cross-sectional view taken along line BB in FIG. In each drawing referred to in this specification, the axial direction of the motor 20 is the X direction, the direction orthogonal to the X direction in the horizontal plane is the Y direction, and the vertical direction orthogonal to the X direction and the Y direction is the Z direction. It is shown.

  The cooling system 1 is a motor cooling system for cooling the motor 20 using a coolant such as oil. The motor 20 as a cooling target of the cooling system 1 is a drive motor provided as a drive source for driving the drive wheels of a vehicle in, for example, an electric vehicle (EV) or a hybrid vehicle (HEV). The cooling system 1 is used to prevent the motor 20 from being damaged by heat in these vehicles.

  Note that the above-described use of the motor 20 as the cooling target of the cooling system 1 is merely an example. For example, the motor 20 may be a motor for power generation and is used by being mounted on a device other than a vehicle. It may be. In the following, an example in which oil is used as the cooling liquid in the cooling system 1 will be described. However, the cooling liquid only needs to be a liquid that has low conductivity so that leakage can be suppressed. It is an example.

  As shown in FIGS. 1 to 3, the cooling system 1 includes a case 10, a motor 20, a cooling pipe 30, and a rotating mechanism 40.

  The case 10 is a member that accommodates various members. Specifically, the motor 10, the cooling pipe 30, and the rotation mechanism 40 are accommodated in the case 10. Specifically, the case 10 is a substantially cylindrical member, and is formed of a metal material such as an aluminum alloy.

  As shown in FIGS. 1 to 3, the motor 20 includes a stator 210 and a rotor 220. The stator 210 is fixed to the case 10, and the rotor 220 is provided to be rotatable with respect to the stator 210. The stator 210 and the rotor 220 have a substantially cylindrical shape, and are arranged coaxially so that the stator 210 is located outside the rotor 220.

  Specifically, the stator 210 includes a stator core 211 made of a plurality of laminated steel plates, and a coil 212 wound around each of a plurality of teeth portions formed on the inner peripheral portion of the stator core 211. In the stator 210, each tooth part of the stator core 211 and the coil 212 wound around each tooth part function as magnetic poles. The teeth portion of the stator core 211 protrudes radially inward from the inner peripheral surface of the stator core 211 and extends in the axial direction X. A plurality of such tooth portions are formed in the inner peripheral portion of the stator core 211 at intervals in the circumferential direction of the stator core 211. The coil 212 of the stator 210 is electrically connected to a battery (not shown) via an inverter (not shown), and electric power is supplied to the coil 212 to generate a rotating magnetic field that rotates along the circumferential direction of the stator 210. To do.

  Specifically, the rotor 220 is arranged along the circumferential direction so that a plurality of permanent magnets alternately have different polarities. When electric power is supplied to the coil 212 of the stator 210 and a rotating magnetic field is generated, a magnetic force acts on the permanent magnet of the rotor 220. Thereby, the rotor 220 rotates relative to the stator 210. A shaft 51 that is rotatably provided with respect to the case 10 is fixed to the inner peripheral portion of the rotor 220 in a state where the shaft 51 is inserted. Therefore, when the motor 20 is driven and the rotor 220 rotates, the shaft 51 rotates integrally with the rotor 220. Specifically, as shown in FIGS. 2 and 3, the shaft 51 is rotatably supported by the case 10 via a pair of bearings 55 and 56 that are spaced apart in the axial direction X and coaxially disposed. Has been. As a result, the shaft 51 and the rotor 220 are rotatable about the central axis along the axial direction X. The shaft 51 is formed of, for example, an iron-based material.

  Here, as shown in FIGS. 1 and 3, in the motor 20, the outer peripheral portion of the stator 210 is provided with a protruding portion 213 that protrudes in the radial direction of the motor 20. Specifically, the protruding portion 213 is provided extending in the axial direction X. More specifically, the protruding portion 213 is provided from one end portion in the axial direction X to the other end portion of the outer peripheral portion of the stator 210. In addition, a plurality of protrusions 213 are arranged at intervals in the circumferential direction of the motor 20. Each projecting portion 213 is formed with a through hole 213 a penetrating in the axial direction X. The other end portion in the axial direction X of the protruding portion 213 is in contact with the portion of the case 10 where the screw hole 10a is formed, and the bolt 59 is inserted from one side of the axial direction X into the through hole 213a of the protruding portion 213. ing. The motor 20 is fixed to the case 10 by screwing the screw part formed at the tip of the bolt 59 with the screw hole 10a.

  As described above, in the present embodiment, the protruding portion 213 protruding from the outer peripheral portion of the stator 210 functions as a portion through which the bolt 59 that fixes the motor 20 to the case 10 is inserted. A protruding portion that protrudes in the radial direction of the motor 20 may be provided on the outer peripheral portion for other purposes. For example, the protruding portion protruding from the outer peripheral portion of the stator 210 may function as a portion through which bolts that fix each other in a state where a plurality of steel plates forming the stator core 211 are stacked are inserted.

  As shown in FIGS. 1 and 2, the cooling pipe 30 is provided to extend in the axial direction X above the motor 20 inside the case 10. The cooling pipe 30 defines a flow path 31 through which the oil 5 flows, and has discharge ports 32a, 32b, 32c, and 32d that are formed to penetrate from the flow path 31 to the side. In the following, the discharge ports 32a, 32b, 32c, and 32d are also simply referred to as the discharge ports 32 unless they are distinguished from each other.

  Specifically, the cooling pipe 30 is a substantially cylindrical member, and is formed of a resin or a metal material. The cooling pipe 30 has an internal space extending in the axial direction X, and the internal space corresponds to the flow path 31. The cooling pipe 30 has an inflow port 33 that is an opening at one end in the axial direction X, and a bottom at the other end in the axial direction X. The inflow port 33 is connected to an oil pump 52 that sucks up and sends out the oil 5 stored in a storage unit (not shown). The oil 5 sent by the oil pump 52 passes from the inflow port 33 to the flow path 31 in the cooling pipe 30. Inflow. Thus, specifically, the oil 5 is supplied from one side of the cooling pipe 30 to the flow path 31 in the cooling pipe 30, and the oil 5 is axially moved from one side to the other side in the flow path 31. Flows to X.

  The reservoir for storing the oil 5 sucked up by the oil pump 52 is formed at the bottom of the case 10, for example. The oil pump 52 is connected to a drive source (not shown) and is driven by the drive source. As a drive source of the oil pump 52, for example, an engine or a drive motor that outputs power transmitted to the drive wheels of the vehicle is used. A motor different from the drive motor that outputs the power transmitted to the drive wheels of the vehicle may be provided as a drive source of the oil pump 52.

  The flow path 31 in the cooling pipe 30 is communicated with an external space on the side of the cooling pipe 30 through discharge ports 32a, 32b, 32c, and 32d. Specifically, the discharge ports 32a, 32b, 32c, and 32d are arranged in this order at intervals in a direction from one side of the axial direction X to the other side. The discharge port 32a is located above the coil end 212a, which is a portion of the coil 212 that protrudes in the axial direction X from one end portion in the axial direction X of the stator core 211. Further, the discharge ports 32 b and 32 c are located above the stator core 211. Further, the discharge port 32d is located above the coil end 212b, which is a portion of the coil 212 that protrudes in the axial direction X from the other end portion in the axial direction X of the stator core 211. Thus, the discharge port 32 is formed in multiple numbers, for example, at intervals in the axial direction of the cooling pipe 30.

  The oil 5 sent from the oil pump 52 and flowing into the flow path 31 in the cooling pipe 30 is discharged from the discharge ports 32 in the radial direction of the cooling pipe 30. Thereby, the oil 5 can be discharged and supplied toward the outer periphery of the motor 20. Specifically, as shown in FIG. 2, the oil 5 discharged from the discharge port 32a can be supplied to the coil end 212a. The stator 5 can be supplied with the oil 5 discharged from the discharge ports 32b and 32c. Further, the oil 5 discharged from the discharge port 32d can be supplied to the coil end 212b.

  Here, the cooling pipe 30 is provided to be rotatable with respect to the case 10. Specifically, as shown in FIG. 2, the cooling pipe 30 is rotatably supported by the case 10 via a pair of bearings 57 and 58 that are spaced apart in the axial direction X and coaxially arranged. Yes. As a result, the cooling pipe 30 is rotatable around the central axis along the axial direction X.

  The rotation mechanism 40 is a mechanism that rotates the cooling pipe 30. Specifically, the rotating mechanism 40 includes a turbine 41 that is provided in the flow path 31 of the cooling pipe 30 and is rotationally driven integrally with the cooling pipe 30 by the oil 5 that flows through the flow path 31. Thereby, the rotation of the cooling pipe 30 by the rotation mechanism 40 is realized when the oil 5 flows through the flow path 31 of the cooling pipe 30. The turbine 41 is an impeller capable of converting fluid kinetic energy into rotational energy, and the rotational axis of the turbine 41 takes a posture along the axial direction X. The turbine 41 may be formed separately from the cooling pipe 30 or may be formed integrally with the cooling pipe 30. Further, the shape of the turbine 41 may be any shape as long as it can convert the kinetic energy of the oil 5 flowing through the flow path 31 into rotational energy, and can take various shapes.

  In the cooling system 1 according to the present embodiment, the cooling pipe 30 is provided so as to be rotatable with respect to the case 10, and the rotation mechanism 40 is provided to use the flow of the oil 5 supplied to the cooling pipe 30. Thus, the cooling pipe 30 can be rotated. Hereinafter, the rotation of the cooling pipe 30 using the flow of the oil 5 will be described with reference to FIG.

  FIG. 4 is a diagram schematically illustrating how the cooling pipe 30 according to the present embodiment rotates together with the turbine 41.

  As described above, when the oil pump 52 is driven by a drive source such as an engine, the oil 5 is sucked up by the oil pump 52 and sent to the cooling pipe 30. As shown in FIG. 4, the oil 5 sent to the cooling pipe 30 flows into the flow path 31 in the cooling pipe 30 from an inlet 33 formed at one end of the cooling pipe 30. The oil 5 that has flowed into the flow path 31 circulates in the flow path 31 along the direction in which the flow path 31 extends, and rotates the turbine 41 while rotating the turbine 41 (that is, the other side of the cooling pipe 30). ). A part of the oil 5 flowing in the flow path 31 is discharged from the discharge port 32a toward the external space of the cooling pipe 30, while the other oil 5 is sent downstream from the discharge port 32a. It is done. Thereafter, a part of the oil 5 passing through the position where the discharge ports 32 b, 32 c, 32 d are provided in the flow path 31 is discharged from each discharge port 32.

  As described above, the oil 5 is continuously discharged from each discharge port 32 while the oil pump 52 is continuously driven. At this time, the turbine 41 is continuously driven to rotate by the oil 5 flowing through the flow path 31. Therefore, in the cooling system 1 according to the present embodiment, the oil 5 is discharged from the discharge port 32 while the cooling pipe 30 is rotating. Here, the position of each discharge port 32 rotates around the rotation axis of the cooling pipe 30 as the cooling pipe 30 rotates. Therefore, the discharge direction of the oil 5 discharged from the discharge port 32 changes according to the change in the position of the discharge port 32 in the circumferential direction of the cooling pipe 30 as the cooling pipe 30 rotates. 4 shows an example in which the rotation direction of the cooling pipe 30 is clockwise when viewed from the inlet 33 side. However, the rotation direction of the cooling pipe 30 is counterclockwise when viewed from the inlet 33 side. There may be.

  From the viewpoint of appropriately rotating the cooling pipe 30, the turbine 41 is preferably disposed on one side of the cooling pipe 30 in the flow path 31 as illustrated in FIGS. 2 and 4. As described above, the oil 5 that has flowed into the flow path 31 from the inlet 33 is sent to the other side of the cooling pipe 30 on the downstream side while being partially discharged from each outlet 32. Therefore, in the other side of the cooling pipe 30 in the flow path 31, compared with the one side of the cooling pipe 30 in the flow path 31, the flow velocity of the flowing oil 5 is small, and the momentum of the oil 5 is weak It has become. Therefore, the turbine 41 can be easily rotated by the flow of the oil 5 by arranging the turbine 41 on one side of the cooling pipe 30 that is the upstream side in the flow path 31, and thus the cooling pipe 30 is appropriately rotated. Can be made. In particular, from the same viewpoint, the turbine 41 is more preferably arranged on the upstream side of any discharge port 32 in the flow path 31 as shown in FIGS. 2 and 4.

  Further, from the viewpoint of stably rotating the cooling pipe 30, the discharge ports 32 a, 32 b, 32 c, and 32 d are preferably arranged so as to be shifted in the circumferential direction of the cooling pipe 30. FIG. 5 is a diagram illustrating an arrangement example of the discharge ports 32 in the circumferential direction of the cooling pipe 30 in the cooling pipe 30 according to the present embodiment. For example, the discharge ports 32a, 32b, 32c, and 32d are sequentially shifted by 90 ° in the circumferential direction of the cooling pipe 30 as shown in FIG. As described above, in the cooling system 1, the oil 5 is discharged from the discharge port 32 while the cooling pipe 30 is rotating. Here, the behavior of the discharge of the oil 5 from the discharge port 32 changes according to the change in the position of the discharge port 32 in the circumferential direction of the cooling pipe 30. For example, due to gravity, the momentum of the oil 5 discharged from the discharge port 32 differs between when the discharge port 32 faces upward and when the discharge port 32 faces downward.

  For example, unlike the arrangement example shown in FIG. 5, when the discharge ports 32 a, 32 b, 32 c, and 32 d are arranged so that the positions of the discharge ports in the circumferential direction of the cooling pipe 30 coincide with each other, the force acting on the cooling pipe 30 The component in the radial direction of the cooling pipe 30 at fluctuates at a period that coincides with the rotation period of the cooling pipe 30. On the other hand, by disposing the discharge ports 32 a, 32 b, 32 c and 32 d in the circumferential direction of the cooling pipe 30, such fluctuations in the radial component of the cooling pipe 30 in the force acting on the cooling pipe 30 are suppressed. be able to. Thereby, the cooling pipe 30 can be rotated stably. In particular, from the same viewpoint, as shown in FIG. 5, it is more preferable to dispose the plurality of discharge ports 32 at equal intervals in the circumferential direction of the cooling pipe 30.

  The number and arrangement of the discharge ports 32 formed in the cooling pipe 30 are not particularly limited to the above example. For example, some of the discharge ports 32 may be omitted from the above configuration example, and the discharge ports 32 may be omitted. May be added. Specifically, the number of discharge ports 32 in the axial direction X may be other than four. A plurality of discharge ports 32 may be provided in the circumferential direction of the cooling pipe 30 at the same position in the axial direction X. Here, from the viewpoint of uniformly cooling the motor 20 in the axial direction X, the discharge port 32 is preferably provided above the coil end 212a, the stator core 211, and the coil end 212b as shown in FIG.

<2. Operation of cooling system>
Then, with reference to FIG.6 and FIG.7, operation | movement of the cooling system 1 which concerns on embodiment of this invention is demonstrated.

  Here, for easy understanding, the operation of the cooling system 9 according to the reference example will be described with reference to FIG. 6 prior to the description of the operation of the cooling system 1 according to the present embodiment. FIG. 6 is a diagram schematically illustrating a path of the oil 5 discharged from the cooling pipe 30 in the cooling system 9 according to the reference example.

  The cooling system 9 according to the reference example is different from the cooling system 1 according to the present embodiment in that the rotation mechanism 40 is not provided. Specifically, in the reference example, the cooling pipe 30 is fixed to the case 10.

  In the cooling system 9, the cooling pipe 30 is connected to the oil pump 52 as in the cooling system 1 according to the present embodiment. Therefore, when the oil pump 52 is driven by a drive source such as an engine, the oil 5 is sucked up by the oil pump 52 and sent to the cooling pipe 30. The oil 5 that has flowed into the flow path 31 flows through the flow path 31 of the cooling pipe 30, whereby the oil 5 is discharged from the discharge port 32. Here, in the reference example, since the cooling pipe 30 is fixed to the case 10, the oil 5 is discharged from the discharge port 32 in a state where the cooling pipe 30 is fixed without rotating. Specifically, in the cooling system 9, the discharge port 32 is provided in the lower portion of the cooling pipe 30, and the oil 5 is discharged downward from the discharge port 32. Therefore, the oil 5 is discharged toward the upper part of the motor 20.

  As shown in FIG. 6, the oil 5 discharged from the discharge port 32 flows downward from the upper part of the motor 20 along the outer peripheral part. Here, the protrusion part 213 which protrudes to the radial direction of the motor 20 is provided in the outer peripheral part of the stator 210 of the motor 20 as mentioned above. Therefore, the oil 5 that flows downward from the upper portion of the motor 20 along the outer peripheral portion is blocked by the protruding portion 213. The oil 5 blocked by the protruding portion 213 flows in the axial direction X along the surface of the protruding portion 213 on the cooling pipe 30 side, and flows down from the end portion in the axial direction X of the motor 20. Therefore, the oil 5 discharged from the discharge port 32 is less likely to reach a portion below the protruding portion 213 in the outer peripheral portion of the motor 20. Thereby, the part below the protrusion part 213 in the outer peripheral part of the motor 20 is not fully cooled, and it becomes easy to become high temperature locally.

  Here, as a method for appropriately distributing the oil 5 to the portion below the projecting portion 213 in the outer peripheral portion of the motor 20, by increasing the flow rate of the oil 5 delivered by the oil pump 52, It is conceivable to increase the discharge amount of the discharged oil 5. As a result, by increasing the momentum of the oil 5 discharged from the discharge port 32, the oil 5 is expected to spread over the protruding portion 213 to a portion below the protruding portion 213 in the outer peripheral portion of the motor 20. Is done. However, when this method is used, the amount of energy consumed to drive the oil pump 52 increases due to an increase in the work amount of the oil pump 52. Thereby, for example, the fuel consumption of the vehicle may be deteriorated.

  Further, as another method for properly distributing the oil 5 to the portion of the outer peripheral portion of the motor 20 below the protruding portion 213, the oil 5 is increased by increasing the number of discharge ports 32 in the circumferential direction of the cooling pipe 30. Can be discharged from the cooling pipe 30 in a plurality of directions. Accordingly, by increasing and diversifying the path of the oil 5 discharged from the cooling pipe 30, the oil 5 reaches the portion below the protruding portion 213 in the outer peripheral portion of the motor 20 beyond the protruding portion 213. It is expected. However, when this method is used, the amount of oil 5 discharged from one of the discharge ports 32 decreases as the number of discharge ports 32 increases. Thereby, the oil 5 discharged from the cooling pipe 30 is likely to be blocked by the protrusion 213. When the flow rate of the oil 5 sent out by the oil pump 52 is increased to compensate for the decrease in the discharge amount of the oil 5 from one discharge port 32, as described above, the oil pump The energy consumed to drive 52 increases. In addition, when this method is used, the path of the oil 5 discharged from the cooling pipe 30 increases, but is discrete, so that it is difficult to sufficiently distribute the oil 5 to each part of the outer peripheral portion of the motor 20.

  Next, the operation of the cooling system 1 according to the present embodiment will be described with reference to FIG. FIG. 7 is a diagram schematically illustrating a path of the oil 5 discharged from the cooling pipe 30 in the cooling system 1 according to the present embodiment.

  As described above, in the cooling system 1 according to the present embodiment, the cooling pipe 30 is rotated by the rotation mechanism 40 using the flow of the oil 5 supplied to the cooling pipe 30. Then, the oil 5 is discharged from the discharge port 32 while the cooling pipe 30 is rotating. Therefore, in the cooling system 1, the discharge direction of the oil 5 discharged from the discharge port 32 changes according to the change in the position of the discharge port 32 in the circumferential direction of the cooling pipe 30 as the cooling pipe 30 rotates. Therefore, it is possible to discharge the oil 5 from the cooling pipe 30 while continuously changing the discharge direction of the oil 5. Thereby, as shown in FIG. 7, the path of the oil 5 discharged from the cooling pipe 30 can be effectively diversified.

  For example, the oil 5 discharged downward from the cooling pipe 30 flows downward along the outer peripheral portion from the upper portion of the motor 20 and reaches the protruding portion 213. Thereby, the oil 5 can be appropriately distributed to the part above the protrusion part 213 in the outer peripheral part of the motor 20. Further, for example, the oil 5 discharged in the left-right direction from the cooling pipe 30 scatters beyond the protruding portion 213, reaches a portion below the protruding portion 213 in the outer peripheral portion of the motor 20, and the motor 20 from the portion. It flows downward along the outer peripheral part. Thereby, the oil 5 can be appropriately distributed to the part below the protrusion part 213 in the outer peripheral part of the motor 20. Thus, according to the cooling system 1 according to the present embodiment, the oil 5 can be sufficiently distributed to each part of the outer peripheral portion of the motor 20.

  Note that the oil 5 discharged from the cooling pipe 30 and scattered beyond the protruding portion 213 may reach a portion below the protruding portion 213 in the outer peripheral portion of the motor 20 without contacting the inner peripheral surface of the case 10. In some cases, the inner peripheral surface of the case 10 is bounced back and reaches a portion below the protruding portion 213 in the outer peripheral portion of the motor 20. In the cooling system 1, the scattered oil 5 is guided to the portion of the motor 20 from the viewpoint of appropriately reaching the oil 5 scattered over the protruding portion 213 to a portion below the protruding portion 213 in the outer peripheral portion of the motor 20. It is preferable that a guide portion is provided.

  In the cooling system 1 according to the present embodiment, the path of the oil 5 discharged from the cooling pipe 30 is effectively diversified while suppressing an increase in the number of discharge ports 32 in the circumferential direction of the cooling pipe 30. Can do. Therefore, the decrease in the discharge amount of the oil 5 from one discharge port 32 is suppressed, and the increase in the flow rate of the oil 5 delivered by the oil pump 52 is suppressed, and the oil 5 is removed from the outer periphery of the motor 20. Each part in the part can be sufficiently distributed.

<3. Effect of cooling system>
Then, the effect of the cooling system 1 which concerns on embodiment of this invention is demonstrated.

  In the cooling system 1 according to the present embodiment, the cooling pipe 30 is provided to be rotatable with respect to the case 10. The cooling system 1 is provided with a rotating mechanism 40 that rotates the cooling pipe 30. Thereby, the oil 5 can be discharged from the discharge port 32 while the cooling pipe 30 is rotating. Therefore, since the oil 5 can be discharged from the cooling pipe 30 while continuously changing the discharge direction of the oil 5, the route of the oil 5 discharged from the cooling pipe 30 can be effectively diversified. it can. Thereby, the oil 5 can be appropriately distributed to the part below the protrusion part 213 in the outer peripheral part of the motor 20. Therefore, according to the cooling system 1, the oil 5 can be sufficiently distributed to each part in the outer peripheral portion of the motor 20, so that the motor 20 can be appropriately cooled, and a locally hot part in the motor 20. Is suppressed from occurring.

  In the cooling system 1 according to the present embodiment, the rotating mechanism 40 is provided in the flow path 31 of the cooling pipe 30, and is a turbine 41 that is rotationally driven integrally with the cooling pipe 30 by the oil flowing in the flow path 31. It is preferable to contain. As a result, the cooling pipe 30 can be appropriately rotated using the flow of the oil 5 supplied to the cooling pipe 30, so that when the oil 5 flows through the flow path 31 of the cooling pipe 30, the cooling pipe 30. Can be properly rotated.

  In the cooling system 1 according to the present embodiment, oil is supplied from one side of the cooling pipe 30 to the flow path 31 of the cooling pipe 30, and the turbine 41 is provided to one side of the cooling pipe 30 in the flow path 31. Preferably they are arranged. As a result, the turbine 41 can be arranged in a portion where the momentum of the oil 5 is relatively strong in the flow path 31, so that the turbine 41 can be easily rotated by the flow of the oil 5. Therefore, the cooling pipe 30 can be rotated more appropriately.

  In the cooling system 1 according to the present embodiment, a plurality of discharge ports 32 of the cooling pipe 30 are formed at intervals in the axial direction of the cooling pipe 30, and the plurality of discharge ports 32 are arranged in the circumferential direction of the cooling pipe 30. It is preferable that they are displaced. Thereby, since the fluctuation | variation of the component of the radial direction of the cooling pipe 30 in the force which acts on the cooling pipe 30 can be suppressed effectively, the cooling pipe 30 can be rotated stably.

<4. Conclusion>
As described above, in the cooling system 1 according to the present embodiment, the cooling pipe 30 is provided to be rotatable with respect to the case 10, and the rotation mechanism 40 that rotates the cooling pipe 30 is provided. As a result, it is possible to discharge the oil 5 from the cooling pipe 30 while continuously changing the discharge direction of the oil 5, effectively diversifying the path of the oil 5 discharged from the cooling pipe 30. Can do. Therefore, since the oil 5 can be appropriately distributed to a portion below the protruding portion 213 in the outer peripheral portion of the motor 20, the motor 20 can be appropriately cooled, and a locally high temperature portion is generated in the motor 20. It is suppressed.

  The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention pertains can make various modifications or application examples within the scope of the technical idea described in the claims. Of course, it is understood that these also belong to the technical scope of the present invention.

  For example, the shape, material, and arrangement of each component such as the case 10, the motor 20, and the cooling pipe 30 of the cooling system 1 are not limited to the configuration examples described above with reference to FIGS. The shape, material and arrangement can be taken.

  Further, for example, the rotation mechanism 40 may be a mechanism that rotates the cooling pipe 30 and is not limited to the example described above. For example, as the rotation mechanism 40, a scraping device that scoops up the oil 5 from the reservoir of the oil 5 and the oil 5 that is scraped and dropped by the scraping device are rotated and driven integrally with the cooling pipe 30. A mechanism including an oil receiving portion may be used. Further, for example, as the rotation mechanism 40, a mechanism including a drive source such as a motor that outputs power for rotationally driving the cooling pipe 30 may be used.

DESCRIPTION OF SYMBOLS 1 Cooling system 5 Oil 10 Case 20 Motor 30 Cooling pipe 31 Flow path 32, 32a, 32b, 32c, 32d Discharge port 33 Inlet port 40 Rotating mechanism 41 Turbine 51 Shaft 52 Oil pump 55, 56, 57, 58 Bearing 59 Bolt 210 Stator 211 Stator core 212 Coil 212a Coil end 212b Coil end 213 Protruding portion 220 Rotor

Claims (4)

Case and
A motor including a stator fixed to the case and a rotor provided rotatably with respect to the stator;
A discharge port that extends in the axial direction of the motor above the motor inside the case, defines a flow path through which a coolant flows, and is formed to penetrate from the flow path to the side. A cooling pipe having
With
The outer periphery of the stator of the motor is provided with a protrusion that protrudes in the radial direction of the motor,
The cooling pipe is rotatably provided with respect to the case,
A rotating mechanism for rotating the cooling pipe;
Motor cooling system. The rotating mechanism includes a turbine that is provided in the flow path of the cooling pipe and is rotated and driven integrally with the cooling pipe by the cooling liquid flowing through the flow path.
The motor cooling system according to claim 1. The coolant is supplied from one side of the cooling pipe to the flow path,
The turbine is disposed on one side of the cooling pipe in the flow path;
The motor cooling system according to claim 2. A plurality of the discharge ports are formed at intervals in the axial direction of the cooling pipe,
The plurality of discharge ports are arranged shifted in the circumferential direction of the cooling pipe,
The motor cooling system according to claim 1.

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