Motor cooling structure

Abstract

To provide a motor cooling structure in which the heat capacity can be increased to enhance the cooling efficiency when a motor is in a locked state.SOLUTION: A motor cooling structure 10 for cooling a motor 30 housed in a motor case 22 with a cooling oil 12, includes a supply port opening / closing member 40 which can open / close a cooling oil supply port 23a disposed in a first wall section 22a of the motor case 22 and which increases the open degree of the cooling oil supply port 23a when a rotary shaft 32 of the motor 30 is stopped, compared to when the rotary shaft 32 is rotating, and a discharge port opening / closing member 42 which can open / close a cooling oil discharge port 24a disposed in a second wall section 22b of the motor case 22 and which closes the cooling oil discharge port 24a when the rotary shaft 32 of the motor 30 is stopped.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a cooling structure for a motor, and more particularly to a cooling structure for a motor that cools the motor by supplying cooling oil to the motor.

[0002] In electric vehicles and hybrid vehicles that use a motor as a drive source for vehicle travel, a so-called motor lock state occurs in which torque is generated while the motor is stopped, for example, in hill-hold control to prevent the vehicle from rolling back on an uphill road. In the motor lock state, a high current may flow concentratedly in the motor coil. If the high current state continues, the coil and the switching elements of the inverter device connected to it may overheat and deteriorate, so that in electric vehicles and the like, a technology is adopted to cool the motor coil using a coolant such as oil or water.

[0003] For example, Patent Document 1 describes a motor cooling device for an electric vehicle equipped with a motor for driving the vehicle, which includes a cooling circuit that uses an oil pump to pump up cooling oil stored in a case that houses the motor and discharges it to the coil of the motor. In this device, a temperature sensor detects the temperature of the motor's stator, and when the detected temperature exceeds a predetermined temperature, the oil pump is operated to discharge cooling oil to the coil and cool the coil.

[0004] Patent Document 2 describes a motor cooling structure in which a water jacket for circulating cooling water is provided inside the stator core of the motor. In this cooling structure, the coil can be cooled by the cooling water flowing through the water jacket via the stator core. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2019-129608 A [Patent Document 2] JP 2001-103701 A Summary of the Invention [Problem to be solved by the invention]

[0006] In the case of use related to the short-time rating of the motor, such as when the motor is locked, the cooling performance is determined by the heat capacity, but the method of discharging cooling oil to the motor coil has the problem that the heat generated by the coil cannot be absorbed by sufficient heat capacity, resulting in poor short-time rating. Also, the method of running cooling water through the water jacket has the problem of low cooling efficiency, since the coil is indirectly cooled via the stator core.

[0007] The present invention has been made in consideration of the above problems, and its object is to provide a motor cooling structure that can improve heat capacity and enhance cooling efficiency when the motor is in a locked state. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, one embodiment of the present invention is characterized in that, in a motor cooling structure that cools a motor housed in a case with cooling oil, the structure comprises: a supply port opening / closing member that is capable of opening and closing a cooling oil supply port provided in a first wall portion of the case, and that, when the rotating shaft of the motor is stopped, increases the opening rate of the cooling oil supply port compared to when the rotating shaft is rotating; and a discharge port opening / closing member that is capable of opening and closing a cooling oil discharge port provided in a second wall portion of the case, and that closes the cooling oil discharge port when the rotating shaft of the motor is stopped. Effect of the Invention

[0009] According to the motor cooling structure of the present invention, it is possible to improve the heat capacity and thus the cooling efficiency. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic explanatory diagram of a cooling structure for a motor according to a first embodiment of the present invention. [Diagram 2]13 is a diagram showing a first plate-shaped body and a supply port opening and closing member attached to a first wall portion. FIG. [Diagram 3] 13 is a diagram showing a second plate-shaped body and a discharge port opening and closing member attached to a second wall portion. FIG. [Figure 4] 2 is an explanatory diagram showing a locked state of the motor in the motor cooling structure shown in FIG. 1. [Diagram 5] FIG. 11 is a schematic explanatory diagram of a cooling structure for a motor according to a second embodiment of the present invention. [Figure 6] 6 is an explanatory diagram showing a locked state of the motor in the motor cooling structure shown in FIG. 5. [Figure 7] FIG. 11 is a schematic explanatory diagram of a cooling structure for a motor according to a third embodiment of the present invention. [Figure 8] 8 is an explanatory diagram showing a locked state of the motor in the motor cooling structure shown in FIG. 7. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] [First embodiment] FIG. 1 is a schematic explanatory diagram of a motor cooling structure 10 according to a first embodiment of the present invention. The motor cooling structure 10 of this embodiment can be applied to a vehicle that uses a motor 30 as a drive source for vehicle travel, such as an electric vehicle or a hybrid vehicle. The cooling structure 10 cools the motor 30 housed in a motor case 22 using cooling oil 12, which is oil flowing through an oil passage provided in a power transmission mechanism of the vehicle. The cooling structure 10 of this embodiment includes a case 20, a motor 30, and a cooling oil circuit 50, and the motor 30 is housed in a motor case 22 that is a part of the case 20. The cooling structure 10 further includes a supply port opening / closing member 40 and a discharge port opening / closing member 42 that can open and close a cooling oil supply port 23a and a cooling oil discharge port 24a formed in the motor case 22, respectively.

[0012] The case 20 is a housing that houses the motor 30 and a power transmission mechanism (not shown). The case 20 has a motor case 22 that houses the motor 30 inside. In this embodiment, a storage chamber 26 that stores the cooling oil 12 is provided adjacent to the motor case 22 inside the case 20. The cooling oil 12 flowing through the oil passage enters and is stored in the storage chamber 26.

[0013] The motor case 22 has a first wall 22a that separates the storage chamber 26 from the motor 30 housing chamber, a second wall 22b that is disposed facing the first wall 22a at a distance, and a third wall 22c that connects the first wall 22a and the second wall 22b. The rotating shaft 32 of the motor 30 penetrates the first wall 22a and the second wall 22b. The third wall 22c surrounds the outer peripheral surface of the motor 30.

[0014] As shown in FIG. 1, the first wall portion 22a is provided with a cooling oil supply port 23a (hereinafter, also simply referred to as "supply port 23a") for supplying the cooling oil 12 into the motor case 22. In this embodiment, as shown in FIGS. 1 and 2, a disk-shaped first plate-shaped body 23 is fixedly installed on the first wall portion 22a, and the supply port 23a is formed in this first plate-shaped body 23. The first plate-shaped body 23 has a through hole in the center through which the rotating shaft 32 of the motor 30 passes, and the supply port 23a is formed around this through hole. In this embodiment, four circular supply ports 23a are provided in the first plate-shaped body 23, but the number of the supply ports 23a may be one or more, and the shape can be set appropriately. When a plurality of supply ports 23a are provided, it is preferable that they are provided at equal intervals in the circumferential direction.

[0015] In addition, a first magnetic body 23b (first supply-side magnetic body) which is a permanent magnet is attached to the first plate-shaped body 23. In the illustrated example, four first magnetic bodies 23b are attached to the first plate-shaped body 23 at equal intervals in the circumferential direction, but it is sufficient that at least two magnetic bodies 23b are arranged. The magnetic poles of the first magnetic body 23b are set so as to generate an attractive force between the first magnetic body 23b and a second magnetic body 41b provided in the supply port opening / closing member 40 described later.

[0016] The second wall portion 22b is provided with a cooling oil outlet 24a (hereinafter, also simply referred to as "outlet 24a") for discharging the cooling oil 12 to the outside of the motor case 22. In this embodiment, as shown in Figs. 1 and 3, a disk-shaped second plate-shaped body 24 is fixedly installed on the second wall portion 22b, and the outlet 24a is formed in this second plate-shaped body 24. The second plate-shaped body 24 has a through hole in the center through which the rotating shaft 32 of the motor 30 passes, and the outlet 24a is formed around this through hole. In this embodiment, four circular outlets 24a are provided in the second plate-shaped body 24, but the number of the outlets 24a may be one or more, and the shape can be set appropriately. When a plurality of outlets 24a are provided, it is preferable that they are provided at equal intervals in the circumferential direction.

[0017] Further, a third magnet body 24b (first discharge side magnet body) which is a permanent magnet is attached to the second plate-shaped body 24. In the illustrated example, four third magnet bodies 24b are attached to the second plate-shaped body 24 at equal intervals in the circumferential direction, but it is sufficient that at least two magnet bodies 24b are arranged. The magnetic poles of the third magnet body 24b are set so as to generate an attractive force between the third magnet body 24b and a fourth magnet body 43b provided on the discharge port opening and closing member 42 described later.

[0018] A cooling oil circuit 50 that circulates the cooling oil 12 supplied to the motor case 22 is connected to the motor case 22. The cooling oil circuit 50 has a flow path that connects an outlet 25a (shown in FIG. 3) provided at the bottom of the third wall portion 22c of the motor case 22 to an inlet 25b provided at the upper part of the third wall portion 22c of the motor case 22. An oil cooler 58 for cooling the cooling oil 12 flowing through the flow path and a pump (not shown) are provided in the flow path of the cooling oil circuit 50. The motor case 22 is provided with a valve body 52 that can open and close the outlet 25a. The valve body 52 is configured to open by pressure from the cooling oil 12 when the amount of the cooling oil 12 stored in the motor case 22 exceeds a predetermined value, and to close when the amount is less than the predetermined value.

[0019] The motor 30 includes a stator 36 fixed to the motor case 22 via a mounting member 38, a rotor (not shown) disposed inside the stator 36, and a rotating shaft 32 rotating together with the rotor. A coil 34 is attached to the stator 36, and FIG. 1 shows a coil end protruding from the stator 36. The rotor is provided with a plurality of laminated plates in which permanent magnets are embedded. The rotating shaft 32 extends substantially horizontally, penetrating the first wall 22a and the second wall 22b of the motor case 22. A supply port opening / closing member 40 and a discharge port opening / closing member 42 are attached to the rotating shaft 22 so as to be adjacent to and overlap the plate-like body 23 of the first wall 22a and the plate-like body 24 of the second wall 22b, respectively.

[0020] The supply port opening / closing member 40 is a member capable of opening and closing the supply port 23a of the motor case 22, and is configured so that when the rotating shaft 32 of the motor 30 is rotating, the supply port 23a is opened and closed, and when the rotating shaft 32 is stopped, the opening ratio of the supply port 23a is larger than when the rotating shaft 32 is rotating. As shown in Fig. 2, the supply port opening / closing member 40 has a disk-shaped supply port opening / closing part main body 41, a supply through hole 41a formed in the supply port opening / closing part main body 41, and a second magnet body 41b (second supply side magnet body) attached to the supply port opening / closing part main body 41.

[0021] The supply port opening / closing unit main body 41 has a through hole in the center through which the rotating shaft 32 passes, is attached to the rotating shaft 32 so as to overlap the plate-like body 23 of the first wall portion 22a, and rotates together with the rotating shaft 32. In this embodiment, the supply port opening / closing unit main body 41 is formed in a disk shape having approximately the same size as the first plate-like body 23. Four supply through holes 41a are provided at equal intervals in the circumferential direction so as to correspond to each supply port 23a of the first plate-like body 23. The second magnet body 41b has magnetic poles set so as to generate an attractive force between itself and the first magnet body 23b provided in the plate-like body 23 forming the first wall portion 22a of the motor case 22, and is provided in the same number as the first magnet body 23b.

[0022] The supply through hole 41a and the second magnet body 41b move in the circumferential direction with the rotation of the supply port opening / closing unit main body 41. The supply through hole 41a is formed at a position overlapping the supply port 23a of the motor case 22 when the second magnet body 41b overlaps with the first magnet body 23b of the motor case 22 due to the rotation of the supply port opening / closing unit main body 41. In this embodiment, as shown in FIG. 2, the arrangement of the supply port 23a and the first magnetic body 23b in the first plate-shaped body 23 and the arrangement of the supply through hole 41a and the second magnet body 41b in the supply port opening / closing member 40 are formed to be substantially equal to each other.

[0023] The discharge port opening / closing member 42 is a member capable of opening and closing the discharge port 24a of the motor case 22, and is configured to open and close the supply port 23a when the rotating shaft 32 of the motor 30 is rotating, and to close the discharge port 24a when the rotating shaft 32 is stopped. As shown in Fig. 3, the discharge port opening / closing member 42 has a disk-shaped discharge port opening / closing part main body 43, a discharge through hole 43a formed in the discharge port opening / closing part main body 43, and a fourth magnet body 43b (second discharge side magnet body) attached to the discharge port opening / closing part main body 43.

[0024] The outlet opening / closing unit body 43 has a through hole in the center through which the rotating shaft 32 passes, is attached to the rotating shaft 32 so as to overlap with the plate-like body 24 of the second wall portion 22b, and rotates together with the rotating shaft 32. In this embodiment, the outlet opening / closing unit body 43 is formed in a disk shape having approximately the same size as the second plate-like body 24. Four outlet through holes 43a are provided at equal intervals in the circumferential direction so as to correspond to each outlet 24a of the second plate-like body 24. The magnetic poles of the fourth magnet body 41b are set so as to generate an attractive force between the fourth magnet body 41b and the third magnet body 24b provided in the plate-like body 24 forming the second wall portion 22b of the motor case 22, and the fourth magnet body 41b is provided in the same number as the third magnet body 24b.

[0025] The discharge through-hole 43a and the fourth magnet body 43b move in the circumferential direction with the rotation of the discharge opening / closing part main body 43. Each discharge through-hole 43a is formed at a position where it can overlap with each discharge opening 24b of the motor case 22 by moving in the circumferential direction. Also, each discharge through-hole 43a is formed at a position where it does not overlap with each discharge opening 24b when the fourth magnet body 43b overlaps with the third magnet body 24b of the motor case 22 by the rotation of the discharge opening / closing part main body 43. In this embodiment, as shown in FIG. 3, when the third magnet body 24b of the second plate-shaped body 24 and the fourth magnet body 43b of the discharge opening / closing member 42 are arranged at the same position in the circumferential direction, the discharge opening 24a and the discharge through-hole 43a are set to be arranged in a circumferentially shifted manner.

[0026] 1, the supply port opening / closing member 40 and the discharge port opening / closing member 42 are disposed outside the motor case 22, but the opening / closing members 40, 42 may be disposed inside the motor case 22 so as to overlap the respective plate-like bodies 23, 24. The supply port opening / closing member 40 and the discharge port opening / closing member 42 are not completely fixed to the rotating shaft 32, and can be configured to be rotatable relative to the rotating shaft 32 only in the direction opposite to the forward rotation direction of the rotating shaft 32.

[0027] Next, in the above-mentioned cooling structure 10, the operation of a normal state in which the rotating shaft 32 of the motor 30 rotates and a locked state in which the rotation of the rotating shaft 32 of the motor 30 stops will be described. In Figs. 1 and 4, the outline arrows indicate the flow direction of the cooling oil 12. As shown in Fig. 1, in the normal state, the supply port opening / closing member 40 and the discharge port opening / closing member 42 each rotate with the rotation of the rotating shaft 32 of the motor 30. The supply port 23a of the motor case 22 is opened when it overlaps with the supply through hole 41a due to the rotation of the supply port opening / closing member 40, and is closed when it is displaced in the circumferential direction relative to the supply through hole 41a. In this way, in the normal state, the supply port 23a is repeatedly opened and closed by the supply port opening / closing member 40, and the cooling oil 12 stored in the storage chamber 26 is supplied into the motor case 22 when the supply port 23a is opened. Similarly, the outlet 24a of the motor case 22 is repeatedly opened and closed when the outlet opening / closing member 42 rotates to overlap the outlet through hole 43a, and is closed when the outlet opening / closing member 42 is displaced circumferentially from the outlet through hole 43a. When the outlet 24a is open, the cooling oil 12 supplied into the motor case 22 is discharged from the outlet 24a to the outside of the motor case 22. In the normal state, the amount of cooling oil 12 in the motor case 22 is relatively small, and the height of the oil level 12a is kept low, by supplying and discharging the cooling oil 12 to and from the motor case 22 in this manner.

[0028] Next, a locked state in which the rotation of the rotating shaft 32 of the motor 30 is stopped will be described with reference to FIG. 4. In the locked state, the rotation of the rotating shaft 32 of the motor 30 is stopped, and as shown in FIG. 2, the second magnet body 41b of the supply port opening and closing member 40 attached to the rotating shaft 32 attracts the first magnet body 23b on the motor case 22 side, and they are overlapped with each other. As a result, the supply port 23a of the motor case 22 is maintained in an open state. Also, when the rotation of the rotating shaft 32 of the motor 30 is stopped, as shown in FIG. 3, the fourth magnet body 43b of the discharge port opening and closing member 42 attracts the third magnet body 24b on the motor case 22 side, and they are overlapped with each other. As a result, the discharge port 24a of the motor case 22 is maintained in a closed state, and the discharge of the cooling oil 12 is stopped. As a result, the cooling oil 12 supplied from the supply port 23a is stored in the motor case 22. In the locked state, the supply port 23a is always open, so that the opening rate of the supply port 23a per unit time is greater than in the normal state, and the amount of cooling oil 12 supplied into the motor case 22 is greater.

[0029] In the locked state, the cooling oil 12 is stored in the motor case 22, so that the height of the oil level 12a of the cooling oil 12 becomes high, and the motor 30 is submerged in the cooling oil 12. When a vehicle equipped with the cooling structure 10 of this embodiment performs hill hold control to prevent the vehicle from rolling back on an uphill road, for example, a so-called motor locked state occurs in which torque is generated while the rotation of the motor 30 is stopped. In the locked state of the motor 30, a high current flows intensively in the coil 34 of the motor 30, and the coil 34 may become hot. In the cooling structure 10 of this embodiment, in such a locked state, the motor 30 is submerged in the cooling oil 12, so that the thermal capacity for absorbing the heat generated by the coil 34 can be improved, and the cooling efficiency of the coil 34 can be improved.

[0030] Furthermore, in the locked state, when the amount of cooling oil 12 stored in the motor case 22 exceeds a predetermined value, the valve body 52 that has been closing the outlet 25a at the bottom of the motor case 22 is opened. As a result, the cooling oil 12 in the motor case 22 circulates through the cooling oil circuit 50 and is cooled by the oil cooler 58 provided in the cooling oil circuit 50. When the heat generated by the coil 34 is absorbed, the temperature of the cooling oil 12 rises, but by cooling the cooling oil 12 by the oil cooler 58 of the cooling oil circuit 50, the cooling efficiency of the coil 34 can be maintained high.

[0031] [Second embodiment] Next, a second embodiment of the motor cooling structure 10 will be described with reference to Figures 5 and 6. In each figure, parts corresponding to those in the first embodiment are given the same reference numerals. In the second embodiment described below, detailed description of the same configuration as in the first embodiment will be omitted. In the second embodiment, the structure of the discharge side of the cooling oil 12 in the motor case 22 is different from that in the first embodiment, but the other configurations are the same.

[0032] In this embodiment, a cooling oil outlet 27b is provided on the lower side of the second wall portion 22b. A trochoid pump 48, which is an outlet opening / closing member capable of opening and closing the outlet 24b, is provided on the outside of the second wall portion 22b. The trochoid pump 48 is in communication with the outlet 27b and is configured to be driven in conjunction with the rotating shaft 32 of the motor 30.

[0033] In the cooling structure 10 of this embodiment, in a normal state in which the motor 22 rotates, the trochoid pump 48 is driven and the discharge port 27b is in an open state. This allows the cooling oil 12 stored in the motor case 22 to be discharged to the outside of the motor case 22 through the discharge port 27b. On the other hand, in a locked state in which the motor 22 stops rotating, the trochoid pump 48 stops driving and the discharge port 27b is in a closed state, so that the discharge of the cooling oil 12 is stopped and the cooling oil 12 can be stored in the motor case 22. This allows the motor 30 to be submerged in the cooling oil 12 in the locked state, improving the thermal capacity for absorbing the heat generated by the coil 34 and increasing the cooling efficiency of the coil 34.

[0034] [Third embodiment] Next, a third embodiment of the motor cooling structure 10 will be described with reference to Figs. 7 and 8. In each drawing, the same reference numerals are used to designate parts corresponding to those in the first embodiment. In the third embodiment described below, detailed description of the same configuration as in the first embodiment will be omitted.

[0035] In this embodiment, the rotating shaft 32 of the motor 30 extends in the vertical direction. The first wall 22a and the second wall 22b of the motor case 22 form the upper wall and the bottom wall of the motor case 22, respectively. As in the first embodiment, the plate-shaped body 23 having the supply port 23a and the first magnet body 23b is fixedly installed on the first wall 22a. The rotating shaft 32 of the motor 30 penetrates the first wall 22a of the motor case 22, and a discharge port opening and closing member 42 is attached to the rotating shaft 32 so as to overlap with the plate-shaped body 23. The plate-shaped body 23 and the supply port opening and closing member 40 of the third embodiment have the same configuration as in the first embodiment, so a description thereof will be omitted here. In addition, in FIG. 7 and FIG. 8, the flow of the cooling oil 12 supplied from the supply port 23a is indicated by black arrows.

[0036] The second wall 22b, which is the bottom wall of the motor case 22, is provided with a cooling oil outlet 28a. In this embodiment, a cylindrical portion 28 protruding downward is provided in the center of the second wall 22b, and the tip opening of the cylindrical portion 28 forms the cooling oil outlet 28a. In the motor 30, the rotating shaft 32 protruding toward the second wall 22b does not penetrate the second wall 22b, and a fluid pumping member 60 is attached to the tip of the rotating shaft 32. The fluid pumping member 60 can be, for example, a propeller that generates fluid pressure by rotation. In this embodiment, the fluid pumping member 60 is arranged to be housed in the cylindrical portion 28. The cooling structure 10 of this embodiment further includes a lid 64 that can open and close the cooling oil outlet 28a, and a biasing member 66 that biases the lid 64 from the outside to the inside of the motor case 22. The biasing member 66 may be, for example, a spring member, and one end of the biasing member 66 is fixed to a vehicle body 68 on which the motor case 22 is mounted, and the other end is connected to the lid body 64. In this embodiment, the lid body 64, the biasing member 66, and the fluid pressure-feeding member 60 constitute a discharge port opening / closing member that can open and close the discharge port 28a.

[0037] In the cooling structure 10 of this embodiment, in a normal state in which the motor 30 shown in Fig. 7 rotates, the fluid pumping member 60, which is a propeller, rotates with the rotation of the rotating shaft 32 of the motor 30. In the normal state, the cooling oil 12 is supplied from the supply port 23a and stored in the motor case 22, particularly in the cylindrical portion 28 forming the bottom of the motor case 22. When the fluid pumping member 60 rotates, the stored cooling oil 12 is pumped to the discharge port 28a side, and this fluid pressure causes the cover 64 that has been closing the discharge port 28a to open the discharge port 28a against the biasing force of the biasing member 66. As a result, the cooling oil 12 in the motor case 22 is discharged from the discharge port 28a.

[0038] Next, in the locked state shown in FIG. 8 where the rotation of the motor 30 stops, the rotation of the fluid pumping member 60 stops with the rotation of the rotary shaft 32. In this state, the urging force of the urging member 66 keeps the cover 64 blocking the discharge port 28a. In the locked state, the amount of cooling oil 12 supplied from the supply port 23a is greater than in the normal state, and the discharge port 28a is blocked, so that the cooling oil 12 is stored in the motor case 22. This allows the motor 30 to be submerged in the cooling oil 12, improving the heat capacity for absorbing the heat generated by the coil 34 and increasing the cooling efficiency of the coil 34. Although not shown, in the third embodiment described above, it is also possible to provide the motor case 22 with a cooling oil circuit 50 having an oil cooler 58, as in the first embodiment.

[0039] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit of the invention. [Explanation of symbols]

[0040] 10 Motor cooling structure 12 Cooling oil 20 cases 22 Motor case 22a First wall 22b Second wall 23 First Plate 23a Cooling oil supply port 23b First magnet body 24 Second Disc 24a,27a,28a Cooling oil outlet 24b Third magnet body 30 Motor 32 Rotation axis 34 Coil 36 Stator 40 Supply port opening and closing member 41 Supply port opening / closing unit body 41a Supply through hole 41b Second magnet body 42 Main body of outlet opening / closing part 42a Ejection through hole 42b Fourth magnet body 48 Trochoid Pump 50 Cooling oil circuit 58 Oil cooler 60 Fluid pressure generating member 64 Lid 66 Pressurizing member

Claims

1. In a motor cooling structure in which a motor housed in a motor case is cooled by cooling oil, a supply port opening / closing member that is capable of opening and closing a cooling oil supply port provided in a first wall portion of the motor case, and that increases an opening ratio of the cooling oil supply port when a rotating shaft of the motor is stopped compared to when the rotating shaft is rotating; a cooling oil outlet opening / closing member that is capable of opening and closing a cooling oil outlet provided in a second wall portion of the motor case and that closes the cooling oil outlet when a rotating shaft of the motor is stopped; A motor cooling structure comprising:

2. the motor case has a first supply-side magnet body on the first wall portion, the rotating shaft of the motor passes through the first wall portion of the motor case, The supply port opening and closing member is a disk-shaped supply port opening / closing unit body attached to the rotary shaft of the motor so as to overlap the first wall portion and rotatable together with the rotary shaft; a supply through hole formed in the supply port opening / closing body and moving in a circumferential direction with rotation of the supply port opening / closing body; a second supply-side magnet body attached to the supply port opening / closing body, which generates an attractive force between itself and the first supply-side magnet body and moves in a circumferential direction in response to rotation of the supply port opening / closing body; 2. The motor cooling structure according to claim 1, wherein the supply through hole is formed at a position overlapping with the cooling oil supply port when the first supply side magnet body and the second supply side magnet body overlap due to rotation of the supply port opening / closing body.

3. the motor case has a first discharge-side magnet body on the second wall portion, the rotating shaft of the motor passes through the second wall of the motor case, The outlet opening and closing member is a disk-shaped outlet opening / closing unit body attached to the rotating shaft of the motor so as to overlap the second wall portion and rotatable together with the rotating shaft; a through hole for discharge formed in the main body of the outlet opening / closing portion, the through hole being movable in a circumferential direction as the main body of the outlet opening / closing portion rotates so as to overlap with the cooling oil outlet; a second discharge side magnet body attached to the discharge port opening / closing unit body, which generates an attractive force between itself and the first discharge side magnet body and moves in a circumferential direction in response to rotation of the discharge port opening / closing unit body; The cooling structure for a motor as described in claim 1 or 2, characterized in that the discharge through hole is formed in a position that does not overlap with the cooling oil discharge outlet when the first discharge side magnet body and the second discharge side magnet body overlap due to rotation of the discharge outlet opening / closing portion main body.

4. 3. The motor cooling structure according to claim 1, wherein the exhaust port opening and closing member is configured as a trochoid pump that communicates with the cooling oil exhaust port of the motor case and drives in conjunction with the rotating shaft of the motor.

5. The outlet opening and closing member is a cover capable of opening and closing the cooling oil discharge port formed in the second wall portion; a biasing member that biases the cover from the outside to the inside of the motor case; a fluid pumping member attached to the rotating shaft of the motor inside the motor case so as to face the lid, and rotating together with the rotating shaft to pump the cooling oil inside the motor case toward the lid, 3. The motor cooling structure according to claim 1, wherein the cover opens the cooling oil discharge port by the fluid pressure of the fluid pressure-feeding member.

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