Motor cooling structure

Abstract

The invention provides a motor cooling structure capable of improving heat capacity and cooling efficiency when a motor is in a locked state. A motor cooling structure (10) for cooling a motor (30) housed in a motor housing (22) by cooling oil (12) is provided with: a supply port opening / closing member (40) capable of opening / closing a cooling oil supply port (23a) provided in a first wall portion (22a) of the motor housing, and capable of opening / closing the cooling oil supply port (23a) in a state in which a rotating shaft (32) of the motor is stopped; the opening ratio of the cooling oil supply port (23a) is set to be larger than that of the rotating shaft (32) when the rotating shaft (32) rotates. And a discharge port opening / closing member (42) capable of opening and closing a cooling oil discharge port (24a) provided in a second wall portion (22b) of the motor housing (22), and closing the cooling oil discharge port (24a) in a state in which a rotating shaft (32) of the motor (30) is stopped.

Description

Technical Field

[0001] The invention relates to a motor cooling structure, in particular to a motor cooling structure for supplying cooling oil to the motor for cooling. Background Art

[0002] In electric vehicles or hybrid vehicles that use motors as a driving source for vehicle travel, a so-called motor lock state may occur, in which torque is about to be generated when the motor is stopped, such as when the vehicle is held on an uphill road to prevent the vehicle from rolling back. In the motor lock state, a high current may flow through the coil of the motor. If the high current state continues, the coil or the switching element of the inverter device connected to it may become overheated and deteriorate. Therefore, in electric vehicles, etc., a technology for cooling the coil of the motor using a coolant such as oil or water is adopted.

[0003] For example, Patent Document 1 describes a motor cooling device, which has a cooling circuit for pumping cooling oil stored in a housing containing the motor and discharging it to the coil of the motor in an electric vehicle equipped with a motor for driving the vehicle. In this device, the temperature of the stator of the motor is detected by a temperature sensor, and when the detected temperature is a high temperature state exceeding a predetermined temperature, the oil pump is activated to spray cooling oil to the coil to cool the coil.

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

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2019-129608

[0008] Patent Document 2: Japanese Patent Application Publication No. 2004-112967 Summary of the invention

[0009] Technical problem to be solved by the invention

[0010] In the use related to the short-time rating of the motor, such as the motor locked state, the cooling performance depends on the heat capacity, but in the method of spraying cooling oil to the motor coil, the heat generated by the coil cannot be absorbed with sufficient heat capacity, resulting in a poor short-time rating. In addition, in the method of flowing cooling water through the water jacket, the coil is cooled indirectly through the stator core, so there is a problem of low cooling efficiency.

[0011] The present invention is made in view of the above problems, and its object is to provide a motor cooling structure, which can increase the heat capacity and thus improve the cooling efficiency when the motor is in a locked state.

[0012] Technical solutions for solving technical problems

[0013] In order to achieve the above-mentioned purpose, one embodiment of the present invention, in a motor cooling structure for cooling a motor housed in a housing using cooling oil, includes: a supply port opening and closing component, which is capable of opening and closing a cooling oil supply port provided on a first wall portion of the housing, and when a rotating shaft of the motor is stopped, an opening ratio of the cooling oil supply port is made larger than when the rotating shaft is rotating; and a discharge port opening and closing component, which is capable of opening and closing a cooling oil discharge port provided on a second wall portion of the housing, and when the rotating shaft of the motor is stopped, closing the cooling oil discharge port.

[0014] Effects of the Invention

[0015] The motor cooling structure of the present invention can increase the heat capacity and thus improve the cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic explanatory diagram of a motor cooling structure according to a first embodiment of the present invention.

[0017] Figure 2 It is a diagram showing the first disk-shaped body and the supply port opening and closing member attached to the first wall portion.

[0018] Figure 3 It is a diagram showing the second disk-shaped body and the discharge port opening and closing member attached to the second wall portion.

[0019] Figure 4 It is shown in Figure 1 An explanatory diagram of the motor locked state in the motor cooling structure shown.

[0020] Figure 5 It is a schematic explanatory diagram of a motor cooling structure according to a second embodiment of the present invention.

[0021] Figure 6 It is shown in Figure 5 An explanatory diagram of the motor locked state in the motor cooling structure shown.

[0022] Figure 7 It is a schematic explanatory diagram of a motor cooling structure according to a third embodiment of the present invention.

[0023] Figure 8 It is shown in Figure 7 An explanatory diagram of the motor locked state in the motor cooling structure shown. DETAILED DESCRIPTION

[0024] [First embodiment]

[0025] Figure 1 1 is a schematic 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 driving source for vehicle travel, such as an electric vehicle or a hybrid vehicle. The cooling structure 10 uses cooling oil 12, which is oil flowing in an oil circuit provided in a power transmission mechanism of the vehicle, to cool the motor 30 housed in a motor housing 22. The cooling structure 10 of this embodiment includes a housing 20, a motor 30, and a cooling oil circuit 50, and the motor 30 is housed in a motor housing 22 that is a part of the housing 20. The cooling structure 10 also includes a supply port opening and closing component 40 and a discharge port opening and closing component 42 that can respectively open and close a cooling oil supply port 23a and a cooling oil discharge port 24a formed on the motor housing 22.

[0026] The housing 20 is a housing for housing the motor 30 and a power transmission mechanism (not shown). The housing 20 has a motor housing 22 that houses the motor 30. In the present embodiment, a storage chamber 26 is provided in the housing 20 adjacent to the motor housing 22 and storing the cooling oil 12. The cooling oil 12 flowing through the oil path enters the storage chamber 26 and is stored.

[0027] The motor housing 22 includes a first wall portion 22a that separates the storage chamber 26 from the storage chamber of the motor 30, a second wall portion 22b that is spaced apart from the first wall portion 22a and arranged opposite to the first wall portion 22a, and a third wall portion 22c that connects the first wall portion 22a and the second wall portion 22b. The rotating shaft 32 of the motor 30 passes through the first wall portion 22a and the second wall portion 22b. The third wall portion 22c surrounds the outer peripheral surface of the motor 30.

[0028] like Figure 1 As shown in FIG. 1 , a cooling oil supply port 23a (hereinafter also referred to as “supply port 23a”) for supplying cooling oil 12 into the motor housing 22 is provided on the first wall portion 22a. Figure 1 and Figure 2 As shown, a first disc-shaped first disc-shaped body 23 is fixedly provided on the first wall portion 22a, and a supply port 23a is formed on the first disc-shaped body 23. The first disc-shaped body 23 has a through hole in the central portion through which the rotating shaft 32 of the motor 30 passes, and the supply port 23a is formed around the through hole. In the present embodiment, four circular supply ports 23a are provided on the first disc-shaped body 23, but the number of the supply ports 23a can be more than one, and the shape can also be appropriately set. If a plurality of supply ports 23a are provided, it is preferred that they are provided at equal intervals along the circumferential direction.

[0029] In addition, a first magnet 23b (first supply-side magnet) as a permanent magnet is mounted on the first disk-shaped body 23. In the illustrated example, four first magnets 23b are mounted at equal intervals in the circumferential direction on the first disk-shaped body 23, but at least two magnets 23b are sufficient. The first magnet 23b is provided with a magnetic pole in such a manner that an attractive force is generated between the first magnet 23b and the second magnet 41b provided on the supply port opening and closing member 40 described later.

[0030] A cooling oil outlet 24a (hereinafter also referred to as “outlet 24a”) is provided on the second wall portion 22b for discharging the cooling oil 12 to the outside of the motor housing 22. Figure 1 and Figure 3 As shown, a second disc-shaped second disc-shaped body 24 is fixedly provided on the second wall portion 22b, and a discharge port 24a is formed on the second disc-shaped body 24. The second disc-shaped body 24 has a through hole in the central portion through which the rotating shaft 32 of the motor 30 passes, and a discharge port 24a is formed around the through hole. In the present embodiment, four circular discharge ports 24a are provided on the second disc-shaped body 24, but the number of the discharge ports 24a can be more than one, and the shape can also be appropriately set. If a plurality of discharge ports 24a are provided, it is preferred that they are provided at equal intervals along the circumferential direction.

[0031] In addition, a third magnet 24b (first discharge side magnet) as a permanent magnet is mounted on the second disk-shaped body 24. In the illustrated example, four third magnets 24b are mounted at equal intervals in the circumferential direction on the second disk-shaped body 24, but at least two magnets 24b are sufficient. The third magnet 24b is provided with a magnetic pole in such a manner that an attractive force is generated between the third magnet 24b and the fourth magnet 43b provided on the discharge port opening and closing member 42 described later.

[0032] The motor housing 22 is connected to a cooling oil circuit 50 for circulating the cooling oil 12 supplied into the motor housing 22. The cooling oil circuit 50 has a bottom portion of the third wall portion 22c provided at the motor housing 22. Figure 4 The flow path is a flow path connecting the outflow port 25a shown in the figure to the inflow port 25b provided at the upper part of the third wall portion 22c of the motor housing 22. An oil cooler 58 and a pump (not shown) for cooling the cooling oil 12 flowing in the flow path are provided in the flow path of the cooling oil circuit 50. A valve body 52 capable of opening and closing the outflow port 25a is provided on the motor housing 22. The valve body 52 is configured to open due to the pressure received from the cooling oil 12 when the amount of the cooling oil 12 stored in the motor housing 22 exceeds a prescribed value, and to close when the amount of the cooling oil 12 is below the prescribed value.

[0033] The motor 30 includes a stator 36 fixed to the motor housing 22 via a mounting member 38, a rotor (not shown) disposed inside the stator 36, and a rotating shaft 32 that rotates together with the rotor. The stator 36 is provided with a coil 34. Figure 1 3 shows the coil end portion protruding from the stator 36. A plurality of laminated plates in which permanent magnets are embedded are provided on the rotor. The rotating shaft 32 passes through the first wall 22a and the second wall 22b of the motor housing 22 and extends in a substantially horizontal direction. On the rotating shaft 22, a supply port opening and closing component 40 and a discharge port opening and closing component 42 are respectively mounted in a manner adjacent to and overlapping with the disk-shaped body 23 of the first wall 22a and the disk-shaped body 24 of the second wall 22b.

[0034] The supply port opening and closing member 40 is a member capable of opening and closing the supply port 23a of the motor housing 22, and is configured such that when the rotating shaft 32 of the motor 30 rotates, the supply port 23a is opened and closed, and when the rotating shaft 32 stops, the opening rate of the supply port 23a is larger than when the rotating shaft 32 rotates. Figure 2 As shown, the supply port opening and closing component 40 has a disc-shaped supply port opening and closing part body 41, a supply through hole 41a formed in the supply port opening and closing part body 41, and a second magnet 41b (second supply side magnet) installed on the supply port opening and closing part body 41.

[0035] The supply port opening and closing portion body 41 has a through hole through which the rotating shaft 32 passes in the central portion, and is mounted on the rotating shaft 32 in a manner overlapping with the disk-shaped body 23 of the first wall portion 22a, and rotates together with the rotating shaft 32. In the present embodiment, the supply port opening and closing portion body 41 is formed into a disk shape of substantially the same size as the first disk-shaped body 23. Four supply through holes 41a are provided at equal intervals in the circumferential direction in a manner corresponding to the supply ports 23a of the first disk-shaped body 23. The second magnet 41b is provided with magnetic poles in a manner that generates attraction between the first magnet 23b provided on the disk-shaped body 23 forming the first wall portion 22a of the motor housing 22, and the same number as the first magnet 23b is provided.

[0036] The supply through hole 41a and the second magnet 41b move in the circumferential direction as the supply port opening and closing portion body 41 rotates. The supply through hole 41a is formed at a position where the second magnet 41b overlaps with the first magnet 23b of the motor housing 22 due to the rotation of the supply port opening and closing portion body 41, and overlaps with the supply port 23a of the motor housing 22. In this embodiment, as shown in FIG. Figure 2 As shown, the arrangement of the supply port 23 a and the first magnet 23 b in the first disk-shaped body 23 is substantially equal to the arrangement of the supply through hole 41 a and the second magnet 41 b in the supply port opening and closing member 40 .

[0037] The discharge port opening and closing member 42 is a member capable of opening and closing the discharge port 24a of the motor housing 22, and is configured to open and close the supply port 23a when the rotating shaft 32 of the motor 30 rotates, and to close the discharge port 24a when the rotating shaft 32 stops. Figure 3As shown, the discharge port opening and closing component 42 has a disk-shaped discharge port opening and closing body 43 , a discharge through hole 43 a formed in the discharge port opening and closing body 43 , and a fourth magnet 43 b (second discharge side magnet) mounted on the discharge port opening and closing body 43 .

[0038] The discharge opening and closing portion body 43 has a through hole in the central portion through which the rotating shaft 32 passes, and is mounted on the rotating shaft 32 in a manner overlapping with the disc-shaped body 24 of the second wall portion 22b, and rotates together with the rotating shaft 32. In the present embodiment, the discharge opening and closing portion body 43 is formed into a disk shape of substantially the same size as the second disc-shaped body 24. Four discharge through holes 43a are provided at equal intervals in the circumferential direction in a manner corresponding to the discharge ports 24a of the second disc-shaped body 24. The fourth magnet 43b is provided with a magnetic pole in a manner that generates an attractive force with the third magnet 24b provided on the disc-shaped body 24 forming the second wall portion 22b of the motor housing 22, and the same number as the third magnet 24b is provided.

[0039] The discharge through-hole 43a and the fourth magnet 43b move in the circumferential direction as the discharge port opening and closing portion body 43 rotates. Each discharge through-hole 43a is formed at a position that can overlap with each discharge port 24a of the motor housing 22 by moving in the circumferential direction. In addition, each discharge through-hole 43a is formed at a position that does not overlap with each discharge port 24a when the fourth magnet 43b overlaps with the third magnet 24b of the motor housing 22 due to the rotation of the discharge port opening and closing portion body 43. In this embodiment, as Figure 3 As shown, when the third magnet 24b of the second disk-shaped body 24 and the fourth magnet 43b of the discharge port opening and closing member 42 are arranged at the same position in the circumferential direction, the discharge port 24a and the discharge through hole 43a are arranged offset in the circumferential direction.

[0040] In addition, Figure 1 In the illustrated embodiment, the supply port opening and closing member 40 and the discharge port opening and closing member 42 are respectively arranged on the outside of the motor housing 22, but the opening and closing members 40 and 42 may be arranged on the inside of the motor housing 22 in a manner overlapping with the disk-shaped bodies 23 and 24. In addition, the supply port opening and closing member 40 and the discharge port opening and closing member 42 may be configured so as not to be completely fixed to the rotating shaft 32, but to be rotatable relative to the rotating shaft 32 only in the direction opposite to the forward rotation direction of the rotating shaft 32.

[0041] Next, the operation of the cooling structure 10 in the normal state in which the rotating shaft 32 of the motor 30 rotates and the locked state in which the rotating shaft 32 of the motor 30 stops rotating will be described. Figure 1 and Figure 4 In FIG. 1 , the hollow arrow indicates the flow direction of the cooling oil 12. Figure 1As shown, in the normal state, as the rotating shaft 32 of the motor 30 rotates, the supply port opening and closing member 40 and the discharge port opening and closing member 42 rotate respectively. The supply port 23a of the motor housing 22 becomes an open state when it overlaps with the supply through hole 41a due to the rotation of the supply port opening and closing member 40, and becomes a closed state when it is circumferentially offset 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 and closing member 40, and the cooling oil 12 stored in the storage chamber 26 is supplied to the motor housing 22 when the supply port 23a is in the open state. Similarly, the discharge port 24a of the motor housing 22 is repeatedly opened and closed in a manner that it overlaps with the discharge through hole 43a due to the rotation of the discharge port opening and closing member 42 and becomes an open state, and becomes a closed state when it is circumferentially offset relative to the discharge through hole 43a. When the discharge port 24a is opened, the cooling oil 12 supplied to the motor housing 22 is discharged from the discharge port 24a to the outside of the motor housing 22. Under normal conditions, by supplying and discharging the cooling oil 12 to and from the motor housing 22, the amount of cooling oil 12 in the motor housing 22 is relatively small, and the height of the oil level 12a is kept low.

[0042] Next, use Figure 4 The locked state in which the rotation of the rotating shaft 32 of the motor 30 is stopped is described. In the locked state, the rotation of the rotating shaft 32 of the motor 30 is stopped, and Figure 2 As shown in FIG. 1 , the second magnet 41b of the supply port opening and closing member 40 mounted on the rotating shaft 32 and the first magnet 23b on the motor housing 22 attract each other and overlap each other. As a result, the supply port 23a of the motor housing 22 remains open. In addition, when the rotation of the rotating shaft 32 of the motor 30 stops, as shown in FIG. Figure 3 As shown, the fourth magnet 43b of the discharge port opening and closing member 42 and the third magnet 24b on the motor housing 22 side attract each other and become overlapped. As a result, the discharge port 24a of the motor housing 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 accumulates in the motor housing 22. In the locked state, since the supply port 23a is always in an open state, the opening rate of the supply port 23a per unit time becomes larger than in the normal state, and the supply amount of the cooling oil 12 supplied to the motor housing 22 becomes larger.

[0043] In the locked state, since the cooling oil 12 is accumulated in the motor housing 22, the height of the oil level 12a of the cooling oil 12 becomes higher, and the motor 30 becomes immersed in the cooling oil 12. When a vehicle equipped with the cooling structure 10 of the present embodiment is performing a slope holding 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 about to be generated when the rotation of the motor 30 is stopped. In the locked state of the motor 30, a high current flows concentratedly through the coil 34 of the motor 30, and the coil 34 sometimes becomes high temperature. In the cooling structure 10 of the present embodiment, in such a locked state, by immersing the motor 30 in the cooling oil 12, the heat capacity for absorbing the heat generated by the coil 34 can be increased, thereby improving the cooling efficiency of the coil 34.

[0044] In addition, in the locked state, when the storage amount of the cooling oil 12 in the motor housing 22 exceeds a predetermined value, the valve body 52 closing the outflow port 25a at the bottom of the motor housing 22 is opened. As a result, the cooling oil 12 in the motor housing 22 circulates in the cooling oil circuit 50 and is cooled by the oil cooler 58 provided in the cooling oil circuit 50. After absorbing the heat generated by the coil 34, the temperature of the cooling oil 12 becomes high, but since the oil cooler 58 in the cooling oil circuit 50 cools the cooling oil 12, the cooling efficiency of the coil 34 can be maintained at a high level.

[0045] [Second embodiment]

[0046] Next, use Figure 5 and Figure 6 , a second embodiment of the cooling structure 10 of the motor is described. In each figure, the same symbols are given to the parts corresponding to the first embodiment. In the second embodiment described below, detailed descriptions of the same structures as the first embodiment are omitted. In the second embodiment, the structure of the discharge side of the cooling oil 12 in the motor housing 22 is different from that in the first embodiment, while the other structures are the same as those in the first embodiment.

[0047] In this embodiment, a cooling oil discharge port 27b is provided at the lower side of the second wall portion 22b. A trochoid pump 48 is provided on the outer side of the second wall portion 22b as a discharge port opening and closing member capable of opening and closing the discharge port 27b. The trochoid pump 48 is connected to the discharge port 27b and is configured to be driven in conjunction with the rotating shaft 32 of the motor 30.

[0048] In the cooling structure 10 of the present embodiment, in the normal state when the motor 30 rotates, the trochoid pump 48 is driven and the discharge port 27b is in an open state. As a result, the cooling oil 12 stored in the motor housing 22 can be discharged from the discharge port 27b to the outside of the motor housing 22. In the locked state where the rotation of the motor 30 stops, the driving of the trochoid pump 48 stops, the discharge port 27b is in a closed state, and thus the discharge of the cooling oil 12 stops, and the cooling oil 12 can be accumulated in the motor housing 22. As a result, in the locked state, the motor 30 can be immersed in the cooling oil 12, and the heat capacity of absorbing the heat generated by the coil 34 is increased, thereby improving the efficiency of cooling the coil 34.

[0049] [Third Embodiment]

[0050] Next, use Figure 7 and Figure 8 , a third embodiment of the motor cooling structure 10 is described. In each figure, the same reference numerals are given to the parts corresponding to the first embodiment. In the third embodiment described below, detailed description of the same structure as the first embodiment is omitted.

[0051] In the present embodiment, the rotating shaft 32 of the motor 30 extends in the up-down direction. The first wall portion 22a and the second wall portion 22b of the motor housing 22 respectively form the upper wall portion and the bottom wall portion of the motor housing 22. On the first wall portion 22a, as in the first embodiment, a disk-shaped body 23 having a supply port 23a and a first magnet 23b is fixedly provided. The rotating shaft 32 of the motor 30 passes through the first wall portion 22a of the motor housing 22, and a supply port opening and closing component 40 is mounted on the rotating shaft 32 in a manner overlapping with the disk-shaped body 23. The disk-shaped body 23 and the supply port opening and closing component 40 of the third embodiment are the same structures as those of the first embodiment, and therefore their description is omitted here. It should be noted that in Figure 7 and Figure 8 In FIG. 2 , the flow of the cooling oil 12 supplied from the supply port 23 a is indicated by black arrows.

[0052] A cooling oil discharge port 28a is provided on the second wall portion 22b, which is the bottom wall portion of the motor housing 22. In the present embodiment, a cylindrical portion 28 protruding downward is provided in the central portion of the second wall portion 22b, and the front end opening of the cylindrical portion 28 forms the cooling oil discharge port 28a. In the motor 30, the front end portion of the rotating shaft 32 protruding toward the second wall portion 22b does not penetrate the second wall portion 22b, and a fluid pressure-feeding component 60 is installed at the front end portion of the rotating shaft 32. The fluid pressure-feeding component 60 may be, for example, a propeller that generates fluid pressure by rotating. In the present embodiment, the fluid pressure-feeding component 60 is configured in a manner to be housed in the cylindrical portion 28. The cooling structure 10 of the present embodiment further includes a cover body 64 capable of opening and closing the cooling oil discharge port 28a, and a force-applying component 66 that applies force to the cover body 64 from the outside to the inside of the motor housing 22. The urging member 66 may be, for example, a spring member, one end of which is fixed to a vehicle body 68 on which the motor housing 22 is mounted, and the other end of which is connected to the cover 64. In the present embodiment, the cover 64, the urging member 66, and the fluid pressure feeding member 60 constitute a discharge port opening and closing member capable of opening and closing the discharge port 28a.

[0053] In the cooling structure 10 of this embodiment, Figure 7 In the normal state in which the motor 30 shown rotates, the fluid pressure-feeding member 60, which serves as a propeller, rotates as the rotating shaft 32 of the motor 30 rotates. In the normal state, the cooling oil 12 is supplied from the supply port 23a, so that the cooling oil 12 is stored in the motor housing 22, particularly in the cylindrical portion 28 forming the bottom of the motor housing 22. However, when the fluid pressure-feeding member 60 rotates, the stored cooling oil 12 is pressure-fed to the discharge port 28a side, and due to the fluid pressure, the cover 64 that closes the discharge port 28a resists the force of the force-applying member 66 and opens the discharge port 28a. As a result, the cooling oil 12 in the motor housing 22 is discharged from the discharge port 28a.

[0054] Next, in Figure 8 In the locked state where the rotation of the motor 30 shown is stopped, the rotation of the fluid pressure feeding component 60 stops as the rotation of the rotating shaft 32 stops. In this state, the cover body 64 maintains the closed state of the discharge port 28a by the force of the force-applying component 66. In the locked state, the supply amount of the cooling oil 12 from the supply port 23a increases compared to the normal state, and the discharge port 28a is closed, so the cooling oil 12 is accumulated in the motor housing 22. As a result, the motor 30 can be immersed in the cooling oil 12, so that the heat capacity for absorbing the heat generated by the coil 34 can be increased, thereby improving the efficiency of cooling the coil 34. In addition, although not shown in the figure, in the above-mentioned third embodiment, as in the first embodiment, a cooling oil circuit 50 having an oil cooler 58 can also be provided on the motor housing 22.

[0055] The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the invention.

[0056] Explanation of symbols

[0057] 10...Motor cooling structure

[0058] 12...Cooling oil

[0059] 20……Shell

[0060] 22...Motor housing

[0061] 22a: First wall portion

[0062] 22b... Second wall portion

[0063] 23...First disc

[0064] 23a...Cooling oil supply port

[0065] 23b...First magnet

[0066] 24... Second disc

[0067] 24a, 27a, 28a...Cooling oil outlet

[0068] 24b...the third magnet

[0069] 30...Motor

[0070] 32…Rotation axis

[0071] 34…Coil

[0072] 36……Stator

[0073] 40...Supply port opening and closing parts

[0074] 41……Supply port opening and closing part body

[0075] 41a... supply through hole

[0076] 41b... Second magnet

[0077] 42......Discharge outlet opening and closing parts

[0078] 43……Discharge outlet opening and closing unit body

[0079] 43a: Through hole for discharge

[0080] 43b……Fourth magnet

[0081] 48... Trochoidal pump

[0082] 50...Cooling oil circuit

[0083] 58...Oil cooler

[0084] 60...Fluid pressure delivery components

[0085] 64……cover

[0086] 66……Force-applying component.

Claims

1. A motor cooling structure, in which a motor housed in a motor housing is cooled by cooling oil, comprising: a supply port opening and closing member capable of opening and closing a cooling oil supply port provided on the first wall portion of the motor housing, and making the opening ratio of the cooling oil supply port larger when the rotating shaft of the motor is stopped than when the rotating shaft is rotating; and A discharge port opening and closing member is capable of opening and closing a cooling oil discharge port provided on the second wall portion of the motor housing, and closes the cooling oil discharge port when the rotating shaft of the motor is stopped.

2. The motor cooling structure according to claim 1, wherein: The motor housing has a first supply-side magnet on the first wall portion. The rotating shaft of the motor passes through the first wall portion of the motor housing. The supply port opening and closing component comprises: a disc-shaped supply port opening and closing portion body, which is mounted on the rotating shaft of the motor in a manner overlapping with the first wall portion and can rotate together with the rotating shaft; a supply through hole formed in the supply port opening and closing portion body and moving in the circumferential direction as the supply port opening and closing portion body rotates; and a second supply-side magnet mounted on the supply-port opening and closing portion body, generating an attractive force between the second supply-side magnet and the first supply-side magnet, and moving in the circumferential direction as the supply-port opening and closing portion body rotates; The supply through hole is formed at a position overlapping with the cooling oil supply port when the first supply-side magnet and the second supply-side magnet overlap with each other due to the rotation of the supply port opening and closing portion body.

3. The motor cooling structure according to claim 1 or 2, wherein: The motor housing has a first discharge-side magnet on the second wall portion. The rotating shaft of the motor passes through the second wall portion of the motor housing. The discharge port opening and closing component comprises: a disk-shaped discharge port opening and closing portion body, which is mounted on the rotating shaft of the motor in a manner overlapping with the second wall portion and is rotatable together with the rotating shaft; a discharge through hole formed in the discharge port opening and closing portion body and capable of moving in the circumferential direction as the discharge port opening and closing portion body rotates so as to overlap with the cooling oil discharge port; as well as a second discharge side magnet which is mounted on the discharge port opening and closing portion body, generates an attractive force between the second discharge side magnet and the first discharge side magnet, and moves in the circumferential direction as the discharge port opening and closing portion body rotates; The discharge through hole is formed at a position that does not overlap with the cooling oil discharge port when the first discharge-side magnet and the second discharge-side magnet overlap due to the rotation of the discharge port opening and closing portion body.

4. The motor cooling structure according to claim 1 or 2, wherein: The discharge port opening and closing member is composed of a trochoid pump that communicates with the cooling oil discharge port of the motor case and is driven in conjunction with the rotating shaft of the motor.

5. The motor cooling structure according to claim 1 or 2, wherein: The discharge port opening and closing component comprises: a cover body capable of opening and closing the cooling oil discharge port formed on the second wall portion; a force applying member for applying force to the cover from the outside to the inside of the motor housing; and a fluid pressure-feeding component, which is mounted on the rotating shaft of the motor in a manner opposite to the cover body inside the motor housing, and pressure-feeds the cooling oil in the motor housing to the cover body side by rotating together with the rotating shaft, The cover opens the cooling oil discharge port due to the fluid pressure caused by the fluid pressure-feeding component.

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