WO2018225878A1

WO2018225878A1 - Motor

Info

Publication number: WO2018225878A1
Application number: PCT/KR2017/005826
Authority: WO
Inventors: 박영일; 정수진
Original assignee: 엘지전자 주식회사
Priority date: 2017-06-05
Filing date: 2017-06-05
Publication date: 2018-12-13

Abstract

A motor of the present embodiment comprises: a motor housing having a space formed on the inside thereof; a stator disposed in the space; a rotor positioned inside of the stator in a rotatable manner; a shaft on which the rotor is mounted; a motor cover assembly covering the space; and an oil outlet coupled to at least one among the motor housing and the motor cover assembly, wherein the motor cover assembly comprises: an inner cover in which are respectively formed least one outer spray hole for injecting oil toward the stator, and at least one inner spray hole for injecting oil toward the rotor; an oil cover coupled to the inner cover; and an oil inlet connected to at least one among the inner cover and the oil cover, and wherein an oil flow path for guiding the oil, that flows in through the oil inlet, to the outer spray hole and the inner spray hole is formed in at least one among the inner cover and the oil cover. Thus, the motor is advantageous in that the volume can be minimized while at the same time allowing efficient heat dissipation respectively from the stator and the rotor with a simple structure.

Description

motor

The present invention relates to a motor, and more particularly to a motor capable of cooling the motor by injecting a cooling fluid into the motor.

In general, a motor is a device that converts electrical energy into mechanical energy by using a force received by a current conductor in a magnetic field.

Recently, in order to prevent environmental pollution due to harmful gases generated during fuel combustion of a vehicle, an example in which a motor is used as a driving source of a vehicle is gradually increasing.

When the motor is driven, high heat is generated, and efficient heat dissipation of the motor may be an important factor in determining the performance of the motor.

The motor may be cooled by air cooling using air and water cooling using cooling water.

When the motor is cooled by water cooling, the motor may be provided with a water jacket through which the coolant passes, between the motor housing and the stator, or in the motor housing itself, a coolant flow path through which the coolant passes may be formed, and supplied from the outside of the motor. The coolant can cool the housing and stator while passing through the water jacket or the coolant flow path.

The motor in which the water jacket is disposed or the coolant flow path is formed is an indirect cooling method of absorbing heat inside the motor into the cooling water through the water jacket or the motor housing, and this indirect cooling method has a problem in that its cooling efficiency is low.

When the motor includes a water jacket, the assembly process for mounting the water jacket has a complicated problem. In the case where the cooling water flow path is formed in the motor housing, the housing structure has a complicated shape and structure, thereby increasing the motor housing manufacturing cost. On the other hand, when the motor is cooled by water cooling as described above, there is a problem in that the total volume of the motor is increased by the volume occupied by the water jacket or the cooling water flow path, and it is not compacted.

On the other hand, in the motor, a cooling fluid such as oil or a compressive refrigerant can directly cool the inside of the motor.

An example of such a motor may be configured such that the cooling fluid is directly injected into the motor, and the Republic of Korea Patent Publication KR 10-1238209 B1 (March 04, 2013 announcement) is a compressive refrigerant used in the steam compression refrigeration cycle motor Disclosed is a spray tube that cools by direct injection therein.

In the motor disclosed in KR 10-123820 B1, an inlet and an outlet for inlet and outlet of a compressive refrigerant are formed in a cover, and an injection tube accommodating part for accommodating a refrigerant injection tube is formed in a frame and a stator, respectively. The injection hole for injecting the compressive refrigerant toward the end of the stator coil is formed in the refrigerant injection pipe for injecting.

However, as described above, the motor using the compressive refrigerant has a low cooling efficiency due to an increase in the flow pressure due to the evaporation of the compressive refrigerant, the inconvenience of frequently filling the compressive refrigerant when the compressive refrigerant leaks, and the maintenance cost of the motor increases. There is a problem.

On the other hand, the motor may be used as a cooling fluid for cooling the inside of the oil, an example of such a motor is disclosed in Republic of Korea Patent Publication KR 10-1340403 B1 (December 11, 2013). In the motor disclosed in KR 10-1340403 B1, an oil introduction flow path in which oil is introduced into the rotor shaft is formed, an oil flow path is formed in the rotor, and oil introduced through the oil introduction flow path of the rotor shaft is in the rotor shaft. After passing through the gap between the rotor and the rotor, it may pass through the oil flow path of the rotor, and the oil may cool the rotor shaft and the rotor while passing sequentially through the rotor shaft, the gap between the rotor shaft and the rotor, and the rotor, respectively. .

However, the motor disclosed in the Republic of Korea Patent Publication KR 10-1340403 B1 forms a flow path through which oil passes between the rotor shaft and the rotor shaft and the rotor, and each of the rotor, which is complicated in structure and complicated in fabrication process. There is an increasing problem.

An object of the present invention is to provide a motor capable of efficiently dissipating each of the stator and the rotor with a simple structure while minimizing the volume.

The present invention for solving the above problems is a motor housing having a space formed therein; A stator disposed in the space; A rotor rotatably positioned inside the stator; A shaft on which the rotor is mounted; A motor cover assembly covering the space; An oil outlet coupled to at least one of the motor housing and the motor cover assembly, the motor cover assembly each having at least one outer injection hole for injecting oil toward the stator and at least one inner injection hole for injecting oil toward the rotor, respectively; A cover; An oil cover coupled to the inner cover; An oil inlet connected to at least one of the inner cover and the oil cover, wherein at least one of the inner cover and the oil cover is formed with an oil flow path portion for guiding oil introduced through the oil inlet to the outer injection hole and the inner injection hole.

The distance between the inner injection hole and the shaft may be shorter than the distance between the outer injection hole and the shaft.

Each of the inner injection hole and the outer injection hole may be formed in plural.

The plurality of outer injection holes may be formed between the virtual circle connecting the plurality of inner injection holes and the outer circumference of the inner cover.

The number of outer injection holes may be greater than the number of inner injection holes.

The oil flow path part may include an inner flow path part in which the inner injection holes communicate with each other, and an outer flow path part in which the outer injection holes communicate with each other.

A plurality of inner injection holes may be formed along the virtual circle.

The inner cover may have a lead wire through hole through which a lead wire connected to the stator passes. The lead wire through hole may be formed between the virtual circle and the outer circumference of the inner cover.

The inner flow path portion may be formed in a circular shape along the virtual circle. The outer flow path portion may be arc shaped.

Both ends of the outer flow path portion may be spaced apart from the lead wire through hole.

The inner cover may further include a sub injection hole for injecting oil into the motor.

The distance between the sub injection hole and the shaft may be longer than the distance between the inner injection hole and the shaft, and may be closer than the distance between the outer injection hole and the shaft.

The sub injection holes may be inclined toward the gap or rotor between the rotor and the stator.

The oil flow path part may further include a sub flow path part in which the sub injection holes communicate.

An example of the sub flow passage portion may communicate with the outer flow passage portion.

Another example of the sub flow passage portion may be spaced apart from each of the inner flow passage portion and the outer flow passage portion.

The motor may further include a terminal block to which a lead wire connected to the stator is connected.

The oil cover may be formed with a terminal block accommodating portion for accommodating the terminal block.

The oil inlet may be spaced apart from the terminal block.

According to the present invention, since the oil injected from the motor cover assembly is injected into the stator and the rotor to cool the stator and the rotor, there is an advantage that the compactness can be achieved than when the cooling jacket is provided on the motor housing or the cooling water flow path is formed on the motor housing.

In addition, since the oil passage is formed in the motor cover assembly according to the present invention, the structure inside the motor is simpler and easier to service than when the cooling pipe for injecting the cooling fluid into the motor is mounted inside the motor. There is this.

In addition, there is an advantage that it is possible to evenly cool each of the stators and rotors of different sizes.

In addition, the terminal block can be mounted on the motor cover assembly, and the oil can be evenly sprayed to the widest area of the stator.

1 is a cross-sectional view of a motor according to an embodiment of the present invention,

Figure 2 is a side view of the inner cover according to an embodiment of the present invention,

3 is a side view of an oil cover according to an embodiment of the present invention;

Figure 4 is an enlarged cross-sectional view of the motor cover assembly, the stator and the rotor according to another embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of a motor according to an embodiment of the present invention, FIG. 2 is a side view of an inner cover according to an embodiment of the present invention, and FIG. 3 is a side view of an oil cover according to an embodiment of the present invention.

This embodiment comprises a motor housing 1, a stator 2, a rotor 3, a shaft 4 and at least one motor cover assembly 5.

The motor housing 1 may form the appearance of the motor together with the motor cover assembly 5.

The space S1 may be formed in the motor housing 1. The stator 2 and the rotor 3 may be disposed in the motor housing 1. The stator 2 and the rotor 3 may be arranged in the space S1. The motor housing 1 can protect the stator 2 and the rotor 3.

The motor may further include a terminal block 17 (see FIG. 3). A bus bar (not shown) may be connected to the terminal block 17. The lead wire 25 (refer to FIG. 1) may be connected to the terminal block 17.

The terminal block 17 may be connected to an inverter (not shown) by a bus bar. The inverter may include a power device such as an IGBT for applying power to the stator 2. One end of the busbar may be connected to the inverter and the other end of the busbar may be connected to the terminal block 17.

The terminal block 17 may be connected to the stator 2 and the lead wire 25. One end of the lead wire 25 may be connected to the stator 2, and the other end of the lead wire 25 may be connected to the terminal block 17.

The terminal block 17 may be mounted to at least one of the motor housing 1 and the motor cover assembly 5.

On the other hand, the motor housing 1 may be formed with an inverter accommodating space for accommodating the inverter.

The inverter accommodating space and the space S1 may be partitioned and formed in the motor housing 1. The inverter accommodation space may be formed outside the space S1. The inverter receiving space and the space S1 may be partitioned from each other by barriers located therebetween.

As described above, when the inverter is accommodated in the motor housing 1, the inverter may be part of the motor.

In this case, the inverter may be disposed outside the motor housing 1, and a bus bar connected to the inverter may be extended to the motor and connected to the terminal block 17.

On the other hand, the motor may include a pair of

motor cover assemblies

5A and 5B. Any one 5A of the pair of

motor cover assemblies

5A and 5B may block one surface of the motor housing 1, and the other one of the pair of

motor cover assemblies

5A and 5B may be The other surface of the motor housing 1 can be blocked.

One of the pair of

motor cover assemblies

5A and 5B 5A may be a rear cover assembly, and the other of the pair of

motor cover assemblies

5A and 5B 5B may be a front cover assembly. have.

The pair of

motor cover assemblies

5A and 5B may be spaced apart from each other in the longitudinal direction X of the shaft 4 with the motor housing 1 interposed therebetween. Each of the pair of

motor cover assemblies

5A and 5B can spray oil toward the stator 2 and the rotor 3.

The motor may further comprise at least one bearing 19A, 19B supporting the shaft 4.

The bearings may each be mounted to a pair of

motor cover assemblies

5A and 5B.

Any one 5A of the pair of

motor cover assemblies

5A and 5B may be equipped with a rear bearing 19A supporting one side of the shaft 4, and the pair of

motor cover assemblies

5A and 5B may be mounted. The other one 5B may be equipped with a front bearing 19B for supporting the other side of the shaft 4.

The stator 2 may be disposed in the space S1. The stator 2 may be formed in a hollow shape. The stator 2 may include a stator core 21 and a stator coil 22 mounted on the stator core 21.

The stator core 21 may be formed in a hollow cylindrical shape, and may surround the outer circumference of the rotor 3.

The inner circumferential surface of the stator core 21 may surround the outer circumferential surface of the rotor 3. A gap G may be formed between the inner circumferential surface of the stator core 21 and the outer circumferential surface of the rotor 3.

The stator coil 22 may be mounted in a slot formed in the stator core 21.

The stator coil 22 may include an inner coil part 23 disposed inside the stator core 21 and an outer coil part 24 extending from the inner coil part 23 to the outside of the stator core 21. have.

The outer coil part 24 may be spaced apart from the motor cover assembly 5. The outer coil part 24 may be spaced apart from the outer injection hole 61 to be described later of the motor cover assembly 5.

The oil injected from the outer injection hole 61 of the motor cover assembly 5 may flow into the outer coil part 24, and the outer coil part 24 is cooled by the oil injected from the outer injection hole 61. Can be. The oil injected from the outer injection hole 61 may cool the outer coil part 24 while flowing through the outer coil part 26.

Meanwhile, the lead wire 25 may be connected to the stator 2. The lead wire 25 may extend to one of the pair of motor cover assemblies 5 and may be connected to the terminal block 17.

The rotor 3 can be mounted to the shaft 4. The rotor 3 may be rotatably positioned inside the stator 2.

The rotor 3 may be hollow cylindrical, the inner circumferential surface of the rotor 3 may face the shaft 4, and the outer circumferential surface of the rotor 3 may face the inner circumferential surface of the stator 2. have.

The rotor 3 may be composed of a combination of a plurality of members, and may include a rotor core 31 and at least one magnet 32.

The rotor core 31 may be laminated with a plurality of steel sheets.

A shaft through hole through which the shaft 4 penetrates may be formed at the center of the rotor core 31.

The magnet core may be formed in the rotor core 31. The magnet mounting portion may be formed to be recessed in the outer surface of the rotor core 31. The magnet mounting portion may be opened from one end of the rotor core 31 to the other end of the rotor core.

The magnet 32 may be mounted to the rotor core 31. The magnet 32 may be inserted into and mounted on the rotor core 31 and may be integrated with the rotor core 31. A plurality of magnets 32 may be mounted to the rotor core 31.

The rotor 3 may comprise a pair of

end plates

34, 35 spaced apart in the longitudinal direction X of the shaft 4.

A shaft through hole through which the shaft 4 penetrates may be formed at the center of the

end plates

34 and 35.

The shaft 4 can be connected with the rotor 3. The shaft 4 can be formed longer than the rotor 3. The shaft 4 may be supported by at least one bearing 19A, 19B.

The shaft 4 may be arranged to penetrate the motor cover assembly 5. In addition, the rotor 3 and the

bearings

19A and 19B may be mounted apart from the shaft 4.

The shaft 4 may comprise an end projecting out of the motor. An end projecting out of the motor of the shaft 4 may be connected to the gearbox of the vehicle or to the axle of the wheel.

The motor cover assembly 5 may cover the space S1. Motor cover assembly 5 may be rear cover assembly 5A or front cover assembly 5B, hereinafter motor cover assembly 5 for a common configuration of rear cover assembly 5A or front cover assembly 5B. It demonstrates by calling.

The motor cover assembly 5 may include an inner cover 6, an oil cover 7, and an oil inlet 8.

The inner cover 6 may cover the space S1. One side of the inner cover 6 may face the space S1, and the other side of the inner cover 6 may face the oil cover 7.

An outer injection hole 61 and an inner injection hole 62 may be formed in the inner cover 6.

The outer injection hole 61 may inject oil toward the stator 2. The oil injected from the outer injection hole 61 may flow to the stator 2 to cool the stator 2, and the outer injection hole 61 may be a stator cooling hole.

The outer injection hole 61 may be opened toward the stator 2. The outer injection hole 61 may be opened toward the stator coil 22. The outer injection hole 61 may be opened toward the outer coil part 24 of the stator coil 22, and may spray oil toward the outer coil part 24.

The outer injection hole 61 may be opened in a direction parallel to the longitudinal direction of the shaft 4 or may be opened in a predetermined angle inclined direction.

At least one outer injection hole 61 may be formed in the inner cover 6. The outer injection hole 61 may be formed in plural in the inner cover 6. The plurality of outer injection holes 61 may be formed to be spaced apart from each other.

The inner injection hole 62 may inject oil toward the rotor 3. Oil injected from the inner injection hole 62 may flow to the rotor 3 to cool the rotor 3, and the inner injection hole 62 may be a rotor cooling hole.

The inner injection hole 62 may be opened in a direction parallel to the longitudinal direction of the shaft 4 or may be opened in a predetermined angle inclined direction.

The inner injection hole 62 may be opened toward the rotor 3. In this case, the inner injection hole 62 may be opened toward the

end plates

34 and 35 of the rotor 3. The inner injection hole 62 may be opened toward the end plate 34 facing the inner cover 6 of the pair of

end plates

34 and 35.

The inner injection hole 62 can also be opened toward the gap G between the rotor 3 and the stator 2, and in this case, the oil injected from the inner injection hole 62 is separated from the rotor 3. It may flow into the gap G between the stators 2.

At least one inner injection hole 62 may be formed in the inner cover 6. A plurality of inner injection holes 62 may be formed in the inner cover 6. The plurality of inner injection holes 62 may be formed to be spaced apart from each other.

The distance L1 between the outer injection hole 61 and the shaft 4 may be different from the distance L2 between the inner injection hole 62 and the shaft 4.

The rotor 3 may be closer to the shaft 4 than the stator 2, and the distance L2 between the inner injection hole 62 and the shaft 4 is between the outer injection hole 61 and the shaft 4. May be shorter than the distance L1.

The plurality of inner injection holes 62 may be formed to be spaced apart from each other along the virtual circle (C).

Here, the virtual circle C is a virtual circle connecting the plurality of inner injection holes 62 and may have a circular shape. That is, a plurality of inner injection holes 62 may be formed along the virtual circle (C). The inner injection holes 62 may be located at equal intervals along the virtual circle (C).

Meanwhile, the plurality of outer injection holes 61 may be formed between the virtual circle C connecting the plurality of inner injection holes 62 and the outer circumference 6A of the inner cover 6.

The area of the area facing the inner cover 6 of the stator 2 may be larger than the area of the area facing the inner cover 6 of the rotor 3. It is preferable that the plurality of outer injection holes 61 are formed to inject oil into a wide area of the stator 2. To this end, the number of outer injection holes 61 may be greater than the number of inner injection holes 62.

The inner cover 6 may further include a sub injection hole 63 for injecting oil into the motor.

The distance L3 between the sub injection hole 63 and the shaft 4 may be farther than the distance L1 between the inner injection hole 62 and the shaft 4. The distance L3 between the sub injection hole 63 and the shaft 4 may be closer than the distance L2 between the outer injection hole 61 and the shaft 4.

The sub-injection hole 63 may inject oil toward the stator 2 or inject oil toward the gap G between the rotor 3 and the stator 2.

Meanwhile, at least one of the inner cover 6 and the oil cover 7 may have an oil flow path 64. The oil flow path unit 64 may guide the oil introduced through the oil inlet 8 to the outer injection hole 61 and the inner injection hole 62.

The oil passing through the oil inlet 8 may be dispersed into the outer injection hole 61 and the inner injection hole 62 by the oil flow path part 64. When the sub injection hole 63 is further formed in the inner cover 6, the oil having passed through the oil inlet 8 is transferred to the outer injection hole 61 and the inner injection hole 62 by the oil flow path part 64. It may be dispersed in the sub injection hole (63).

The oil flow path part 64 may include an outer flow path part 65 through which the outer injection holes 61 communicate with each other, and an inner flow path part 66 through which the inner injection holes 62 communicate with each other. When the sub injection holes 63 are further formed in the oil cover 6, the oil flow path part 64 may further include a sub flow path part 67 through which the sub injection holes 63 communicate.

Hereinafter, the oil flow path part 64 will be described as including both the outer flow path part 65, the inner flow path part 66, and the sub flow path part 67, but the oil flow path part 64 is the sub flow path part 67. Of course, it is also possible to include the outer flow path portion 65 and the inner flow path portion 66 without including.

The inner cover 6 may be formed with a lead wire through hole 68 through which the lead wire 28 connected to the stator 2 passes. The lead wire through hole 68 may include a virtual circle C and an inner cover ( It may be formed between the outer circumference 6A of 6).

The oil flow path part 64 may be formed in the inner cover 6, and may be formed in a region other than the lead wire through hole 68 of the inner cover 6.

The outer flow path part 65 may have an arc shape. Both ends 65A and 65B of the outer flow path part 65 may be spaced apart from the lead wire through hole 68.

The inner flow path portion 66 may be formed in a circular shape along the virtual circle (C). The inner flow path part 66 may be radially spaced apart from the lead wire through hole 68.

The sub flow path part 67 may be formed to communicate with the outer flow path part 65 or may be spaced apart from each of the outer flow path part 65 and the inner flow path part 66.

The oil flow path part 64 may include a plurality of sub flow path parts 67, and any one 67A of the plurality of sub flow path parts 67 may be formed to communicate with the outer flow path part 65. The other one 67B of the sub-channels 67 may be spaced apart from each of the outer channel 65 and the inner channel 66.

The oil cover 7 may be coupled to the inner cover 6. As shown in FIG. 3, the oil cover 7 may be provided with a terminal block accommodating part 76 in which the terminal block 17 is accommodated.

The terminal block 17 can be mounted to the motor cover assembly 5. The terminal block 17 may be fastened to one of the inner cover 6 and the oil cover 7 by a fastening member such as a screw.

The oil inlet 8 may be connected to at least one of the inner cover 6 and the oil cover 7. The oil inlet 8 can guide oil into the motor cover assembly 5.

The oil inlet 8 may be spaced apart from the terminal block 17, as shown in FIG. 3.

The motor cover assembly 5 may have an oil distribution passageway 72 formed on at least one of the inner cover 6 and the oil cover 7. The oil distribution passageway 72 may disperse the oil passing through the oil inlet 8 into the outer flow passage portion 65, the inner flow passage portion 66, and the sub flow passage portion 67.

When the oil distribution passage 72 is formed in the inner cover 6, the oil inlet 8 is formed in one of the flow passages of the outer flow passage portion 65, the inner flow passage portion 66, and the sub flow passage portion 67. The oil passage may communicate with the oil inlet 8, and the oil passage may be connected to the oil distribution passage 72 and the other passage portion where the oil inlet 8 does not communicate.

For example, when the oil inlet 8 is in communication with the outer flow path portion 65, the outer flow path portion 65 passes through each of the inner flow path portion 66 and the sub flow path portion 67 and the oil distribution flow path 72. The oil flowing into the outer flow path portion 65 from the oil inlet 8 may flow in part to the inner flow path portion 66 and the sub flow path portion 67 through the oil distribution flow passage 72.

When the oil distribution channel 72 is formed in the oil cover 7, the oil inlet 8 can communicate with the oil distribution channel 72, and the oil distribution channel 72 is formed with the outer flow path portion 65. Each of the flow path portion 66 and the sub flow path portion 67 may be in communication with each other. The oil distribution channel 72 may be formed on a surface of the oil cover 7 that faces the inner cover 6, and the oil introduced into the oil distribution channel 72 from the oil inlet 8 may be the oil distribution channel 72. In an embodiment, the outer flow path part 65, the inner flow path part 66, and the sub flow path part 67 may be evenly distributed.

Meanwhile, the motor may further include an oil outlet 9 coupled to at least one of the motor housing 1 and the motor cover assembly 5. The oil outlet 9 may be provided at the bottom of the motor. The oil outlet 9 may be provided in plurality in the lower portion of the motor.

The motor may be connected to an oil cooler (not shown) and an oil tube (not shown) for cooling the oil. The oil tube may be equipped with an oil pump.

The oil tube can be connected to the oil inlet (8) and the oil outlet (9), and the motorized vehicle is connected to the oil cooler, the oil pump and the oil supply tube and the oil outlet (9) connected to the oil inlet (8). It may include an oil return tube.

When the oil pump is driven, the oil may circulate the oil cooler, the oil pump and the motor, and the oil cooled in the oil cooler may flow into the oil inlet 8 and then into the motor cover assembly 5. And may be injected into the stator 2 and the rotor 3 inside the motor cover assembly 5.

Oil that cools the inside of the motor may fall on the inner lower portion of the motor housing 1, and the oil that has fallen on the inner lower portion of the motor housing 1 may flow out of the motor through the oil outlet 9. .

Referring to the operation of the present invention configured as described above are as follows.

First, when the oil pump is driven, oil may flow into the motor cover assembly 5 through the oil inlet 8. The oil passing through the oil inlet 8 may be dispersed into the outer flow path part 65, the inner flow path part 66, and the sub flow path part 67.

Such oil can cool the outer flow path part 65, the inner flow path part 66, and the sub flow path part 67, and the motor cover assembly 5 can be cooled by the oil.

Oil introduced into the outer flow path part 65 may be injected toward the stator 2 through the outer injection hole 61. Oil injected from the outer injection hole 61 toward the stator 2 may flow to the stator coil 22 to cool the stator coil 22, and flow along the stator coil 22 to move the stator coil 22. Can be cooled.

Oil introduced into the inner flow path part 66 may be injected toward the rotor 3 through the inner injection hole 62. Oil injected into the rotor 3 from the inner injection hole 61 may cool the rotor 3 and may be scattered around the rotor 3.

In addition, the oil introduced into the sub flow path part 67 may be injected toward the gap G between the stator 2 or the stator 2 and the rotor 3 through the sub injection hole 63. Oil injected from the sub-injection hole 63 flows along the outer circumferential surfaces of the stator coil 22, the stator core 21, and the rotor 3, and the stator coil 22, the stator core 21, and the rotor 3. It can cool the outer circumference of the surface.

The oil injected as described above may fall to the inner lower portion of the motor housing 1, and the oil at the inner lower portion of the motor housing 1 may be discharged through the oil outlet 9.

The motor of this embodiment is capable of primarily cooling the motor cover assembly 5 as oil flows along the motor cover assembly 5, and oil is applied to the stator 2 and the rotor 3 in the motor cover assembly 5, respectively. It can be directly injected into the cooler to directly cool the stator (2) and the rotor (3), the motor can be cooled in its entirety by the oil.

In this embodiment,

impellers

110 and 120 for scattering oil may be further formed in at least one of the rotor 3 and the shaft 4.

In this embodiment, since the configuration and operation other than the

impeller

110, 120 is the same or similar to the embodiment of the present invention, a detailed description thereof will be omitted.

Impellers

110 and 120 may include a rotor impeller 110 formed in the rotor 3. The rotor impeller 110 may be formed in an area of the rotor 3 facing the motor cover assembly 5.

The rotor impeller 110 may include a plurality of blades 112.

The rotor impeller 110 may further include an oil guide 111 having a plurality of blades 112 formed therein.

As the oil guide 111 is closer to the pair of motor cover assemblies 5, the outer diameter D2 may be reduced.

The oil guide 111 may be hollow so as to surround a portion of the shaft 4. The oil guide 111 may have a shaft through hole through which the shaft 4 penetrates.

The inner diameter D3 of the oil guide 111 may be larger than the outer diameter of the shaft 4 or the same as the outer diameter of the shaft 4.

The oil guide 111 may redirect the oil guided along its outer surface in the centrifugal direction.

The plurality of blades 112 may be formed to protrude from the oil guide 111. The plurality of blades 112 may protrude from the outer surface of the oil guide 111.

To this end, each of the plurality of blades 112 may include a leading edge 113 at the front end in the direction of guiding the fluid and a trailing edge 114 at the rear end in the direction of guiding the fluid.

Each of the plurality of blades 112 may be curved in an arc shape between the leading edge 113 and the trailing edge 114.

Each of the plurality of blades 112 may be formed along a three-dimensional curved surface, and the leading edge 113 and the trailing edge 114 may face different directions, and when the rotor impeller 110 rotates, the blade ( 112 can accelerate oil with low noise and high efficiency.

Each of the plurality of blades 112 may further include a blade tip 115 connecting the leading edge 113 and the trailing edge 114.

The leading edge 113 may be formed closer to the shaft 4 than the trailing edge 114.

The leading edge 113 may face the motor cover assembly 5, and the trailing edge 114 may face the outer coil portion 24 of the stator coil 22.

As the oil is guided along the oil guide 111 and the blade 112, the flow direction may be gradually changed to the centrifugal direction, and the oil exiting the trailing edge 114 of the blade 112 may be transferred to the stator coil 22. It may flow toward the outer coil unit 24.

The oil flowing from the moker cover assembly 5 to the rotor impeller 110 may be accelerated while being guided along the oil guide 111 and the blade 112 of the rotor impeller 110, and this accelerated oil may be accelerated by the stator coil ( 22 may be scattered at a high speed toward the outer coil part 24.

An example of the rotor impeller 110 may include both the oil guide 111 and the plurality of blades 112 as described above.

Another example of the rotor impeller 110 may include a plurality of blades 112 protruding from one surface of the end plate 35 without a separate oil guide 111.

On the other hand, the inner injection hole 62 of the present embodiment may be opened toward the region where the leading edge 113 of the rotor impeller 110 is located. Here, the region where the leading edge 113 is located in the rotor impeller 110 may be an area closer to the shaft 4 of the rotor impeller 110.

The rotor impeller 110 may be divided into an inner region and an outer region based on a boundary between the leading edge 113 and the blade tip 115.

The inner region may be defined as the region between this boundary and the inner circumference of the oil guide 111, and the outer region may be defined as the outer region of the inner region IA of the rotor impeller 110.

The inner injection hole 62 may be opened toward the inner region, in which case, the oil injected from the inner injection hole 62 to the inner region is guided to the oil guide 111 and the blade 112 while leading the leading edge 113. Can be guided to the trailing edge 114, and this oil can be accelerated at high speed by the rotor impeller 110.

Impellers

110 and 120 may include a shaft impeller 120 formed on the shaft 4.

The shaft impeller 120 has a different position from the rotor impeller 110 and may be smaller in size than the rotor impeller 110. The shaft impeller 120 may have the same configuration and operation as the rotor impeller 110 other than its position and size, and detailed description thereof will be omitted.

The shaft impeller 120 may include a plurality of blades 122, and may include a plurality of blades 122 and an oil guide 121 together.

The blade 122 of the shaft impeller 120 may have the same shape as the blade 112 of the rotor impeller 110, and a detailed description thereof will be omitted.

The oil guide 121 of the shaft impeller 120 may have the same shape as the oil guide 111 of the rotor impeller 110, and a detailed description thereof will be omitted.

Some of the oil injected through the inner injection hole 62 and the outer injection hole 63 and the sub injection hole 64 may fall to the outer circumferential surface of the shaft 4, and such oil may be dropped into the shaft impeller 120. Guided to and may be accelerated while flying in the centrifugal direction of the shaft impeller 120. The oil accelerated by the shaft impeller 120 can be accelerated to the stator coil 22 of the stator 2, in particular to the outer coil part 24, and flows to the outer coil part 24 by the shaft impeller 120. The oil may cool the stator 2.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention.

Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments.

The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

Claims

A motor housing having a space formed therein;

A stator disposed in the space;

A rotor rotatably positioned inside the stator;

A shaft on which the rotor is mounted;

At least one motor cover assembly covering the space and

An oil outlet coupled to at least one of the motor housing and the motor cover assembly,

The motor cover assembly

An inner cover having at least one outer injection hole for injecting oil toward the stator and at least one inner injection hole for injecting oil toward the rotor;

An oil cover coupled to the inner cover;

An oil inlet connected to at least one of the inner cover and the oil cover,

At least one of the inner cover and the oil cover motor having an oil flow path portion for guiding oil introduced through the oil inlet to the outer injection hole and the inner injection hole.
The method of claim 1,

And the distance between the inner injection hole and the shaft is shorter than the distance between the outer injection hole and the shaft.
The method of claim 1,

Each of the inner injection hole and the outer injection hole is formed in plurality,

The plurality of outer injection holes are formed between the virtual circle connecting the plurality of inner injection holes and the outer circumference of the inner cover.
The method of claim 1,

The number of the outer injection holes is a motor more than the number of the inner injection holes.
The method of claim 1,

The oil flow path part

An inner flow path part in which the inner injection hole communicates with the inner flow path part;

And an outer flow path part in which the outer injection holes communicate with each other.
The method of claim 5, wherein

The inner injection hole is formed in plurality along the virtual circle,

The inner cover has a lead wire through hole through which a lead wire connected to the stator passes.

The lead wire through hole is a motor formed between the virtual circle and the outer circumference of the inner cover.
The method of claim 6,

The inner flow path portion is formed in a circular shape along a virtual circle,

The outer flow path portion is arc-shaped,

Both ends of the outer flow path part may be spaced apart from the lead wire through hole.
The method of claim 5, wherein

The inner cover is further formed with a sub injection hole for injecting oil into the motor,

And a distance between the sub injection hole and the shaft is longer than a distance between the inner injection hole and the shaft and shorter than a distance between the outer injection hole and the shaft.
The method of claim 8,

The sub injection hole is a motor for injecting oil toward the stator or the gap between the rotor and the stator.
The method of claim 8,

The oil flow path unit further includes a sub flow path unit in which the sub injection holes communicate with each other,

And the sub flow passage portion communicates with the outer flow passage portion or is spaced apart from each of the inner flow passage portion and the outer flow passage portion.
The method of claim 1,

A terminal block to which a lead wire connected to the stator is connected;

The oil cover is formed with a terminal block receiving portion for receiving the terminal block,

The oil inlet is a motor spaced apart from the terminal block.