KR102303799B1 - motor - Google Patents

Abstract

The present embodiment includes a housing assembly having a space formed therein; a stator disposed within the housing assembly; a rotor rotatably positioned inside the stator; It is mounted on the shaft and the housing assembly on which the rotor is mounted and includes an oil injection pipe for spraying oil on the outer surface of the rotor, wherein the oil injection pipe includes an oil passage through which oil passes; At least one rotor cooling hole for spraying oil from the oil passage to the outer surface of the rotor is formed, so that the maintenance cost is lower than when cooling the inside of the motor with a compressed refrigerant, and oil passages are formed in each of the shaft and the rotor. There is an advantage in that the structure is simpler than the case of the case and the production is easy.

Description

motor

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

In general, a motor (or electric motor) is a device that converts electrical energy into mechanical energy by using the force received by a conductor through which an electric current flows in a magnetic field.

Recently, in order to prevent environmental pollution caused by harmful gas generated during fuel combustion of a vehicle, examples in which a motor is used as a driving source of a vehicle are gradually increasing.

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

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

When the motor is cooled by water cooling, a water jacket through which the cooling water passes is disposed between the motor housing and the stator, or a cooling water flow path through which the cooling water passes may be formed in the motor housing itself. The coolant may cool the housing and the stator while passing through the water jacket or coolant passage.

Such a motor in which a water jacket is disposed or a cooling water flow path is formed is an indirect cooling method in which heat inside the motor is absorbed by the cooling water through the water jacket or the motor housing, and this indirect cooling method has a problem in that the cooling efficiency is low.

When the motor includes a water jacket, there is a problem in that the assembly process for mounting the water jacket is complicated. In addition, when the cooling water flow path is formed in the motor housing, there is a problem in that the shape and structure of the housing structure is complicated, so that the manufacturing cost of the motor housing is increased. On the other hand, when the motor is cooled by water cooling as described above, the total volume of the motor increases by the volume occupied by the water jacket or the cooling water flow path, and there is a problem in that it cannot be compact.

Meanwhile, in the motor, it is possible that a cooling fluid such as oil or a compressible refrigerant directly cools the inside of the motor.

An example of such a motor may be configured such that a cooling fluid is directly injected into the motor, and in Korean Patent Publication KR 10-1238209 B1 (announced on March 04, 2013), a compressible refrigerant used in a vapor compression refrigeration cycle is used in the motor. Disclosed is an injection tube for cooling by direct injection into the interior.

In the motor disclosed in Korean Patent Publication No. KR 10-123820 B1, an inlet and an outlet for inflow and outflow of the compressible refrigerant are formed in the cover, and an injection tube receiving portion for accommodating the refrigerant injection tube is formed in the frame and the stator, respectively, and the compressible refrigerant An injection hole for injecting the compressible refrigerant toward the end of the stator coil is formed in the refrigerant injection pipe for injecting the .

However, in the motor using the compressible refrigerant as described above, the flow path pressure is increased by evaporation of the compressible refrigerant, so the cooling efficiency is low, there is the inconvenience of frequently filling the compressible refrigerant when the compressible refrigerant leaks, and the maintenance cost of the motor is increased. There is a problem.

On the other hand, it is possible to use oil as a cooling fluid for cooling the inside of the motor, and an example of such a motor is disclosed in Korean Patent Publication No. KR 10-1340403 B1 (December 11, 2013). In the motor disclosed in Korean Patent Publication No. KR 10-1340403 B1, an oil introduction passage through which oil is introduced is formed in the rotor shaft, an oil passage is formed in the rotor, and the oil introduced through the oil introduction passage of the rotor shaft is transferred to the rotor shaft. After passing through the gap between the rotor and the rotor, it can pass through the oil passage of the rotor, and the oil can cool the rotor shaft and the rotor while sequentially passing through the rotor shaft, the gap between the rotor shaft and the rotor, and each of the rotors .

However, since the motor disclosed in Korean Patent Publication No. KR 10-1340403 B1 forms a flow path through which oil passes between the rotor shaft and the rotor shaft and in each of the rotors, the structure is complicated and the manufacturing process is complicated, so the cost is high. There is an increasing problem.

An object of the present invention is to provide a motor capable of efficiently dissipating heat while being easy to manufacture as well as having a low maintenance cost.

The present invention for solving the above problems is a housing assembly having a space formed therein; a stator disposed in the space; a rotor rotatably positioned inside the stator; an oil flow path through which oil passes through an oil jet pipe mounted to the shaft and the housing assembly on which the rotor is mounted to be spaced apart from the rotor; At least one rotor cooling hole for spraying oil in the oil passage toward the outer surface of the rotor may be formed.

The rotor may include a pair of end plates spaced apart in the longitudinal direction of the shaft. And, the impeller may protrude from the outer surface of at least one of the pair of end plates. The rotor cooling hole may be opened in a direction to inject oil toward the impeller.

The impeller may include a plurality of blades whose leading edge is closer to the shaft than the trailing edge.

The rotor cooling hole may open toward a region of the impeller where the leading edge is located.

The stator may include a stator core surrounding the outer circumference of the rotor, and a stator coil mounted on the stator core.

The stator coil may include an inner coil part disposed inside the stator core, and an outer coil part extending from the inner coil part to the outside of the stator core and spaced apart from the outer circumference of the impeller in the radial direction of the shaft.

The housing assembly includes a motor housing having a space therein; It may include a motor cover that covers the space of the motor housing.

The impeller may protrude toward the motor cover on a side facing the motor cover among both surfaces of the end plater.

The impeller may include an oil guide for guiding the oil in a centrifugal direction. The plurality of blades may protrude from the outer surface of the oil guide. The outer diameter of the oil guide may be reduced as it approaches the motor cover.

The motor may further include at least one oil inlet mounted to protrude outwardly on an upper portion of the motor housing, and an oil outlet mounted to protrude outwardly from a lower portion of the motor housing.

The oil injection pipe may be connected to the oil inlet and may be horizontally disposed long inside the housing.

A plurality of rotor cooling holes may be formed in the oil injection pipe. An interval between the plurality of rotor cooling holes may be smaller than an outer diameter of the rotor.

The motor cover may be equipped with a bearing for supporting the shaft.

The oil injection pipe may have a motor cover cooling hole that has a different opening direction from the rotor cooling hole and injects oil toward the motor cover.

The motor cover may further include a bearing housing portion surrounding the outer periphery of the bearing. At least one oil hole for guiding oil to the periphery of the bearing may be formed in the bearing housing. In addition, an oil chamber part in which an oil hole communicates and oil is collected may be formed in an upper portion of the bearing housing part.

A stator cooling hole for spraying oil toward the stator may be formed in the oil injection pipe.

A shaft impeller having a plurality of blades for scattering oil may be formed on the outer periphery of the shaft.

A shaft groove for scattering oil may be formed on the outer periphery of the shaft.

The present invention has advantages in that the maintenance cost is lower than when the compressed refrigerant is injected into the motor, and the structure is simpler and easier to manufacture than when oil passages are formed in each of the shaft and the rotor.

In addition, since the oil injected from the oil injection pipe to the impeller is scattered while being accelerated by the impeller, the effect of oil scattering can be maximized, and there is an advantage that the cooling performance can be improved.

In addition, there is an advantage in that the heat of the rotor can be more efficiently dissipated by maximizing the time the oil is in contact with the impeller.

1 is a cross-sectional view of a motor according to an embodiment of the present invention;
2 is a perspective view showing the inside of a motor according to an embodiment of the present invention;
3 is an enlarged cross-sectional view of an impeller and an oil injection pipe according to an embodiment of the present invention;
4 is a side view showing a rotor and a stator and an oil injection pipe of a motor according to an embodiment of the present invention;
5 is an enlarged view showing a rear motor cover and a rear bearing of a motor according to an embodiment of the present invention;
6 is a partially cut-away cross-sectional view showing a rear motor cover and a rear bearing of a motor according to an embodiment of the present invention;
7 is an enlarged view showing a front motor cover and a front bearing of a motor according to an embodiment of the present invention;
8 is a partially cut-away cross-sectional view showing a front motor cover and a front bearing of a motor according to an embodiment of the present invention;
9 is a perspective view showing an oil injection pipe of a motor according to an embodiment of the present invention;
10 is an enlarged cross-sectional view of the inside of a motor according to another embodiment of the present invention;
11 is an enlarged cross-sectional view of the inside of a motor according to another embodiment of the present invention.

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

1 is a cross-sectional view of a motor according to an embodiment of the present invention, FIG. 2 is a perspective view showing the inside of the motor according to an embodiment of the present invention, and FIG. 3 is an impeller and oil according to an embodiment of the present invention The injection pipe is an enlarged cross-sectional view, and FIG. 4 is a side view showing the rotor, the stator, and the oil injection pipe of the motor according to an embodiment of the present invention.

The motor of this embodiment includes a housing assembly 1 , a stator 2 , a rotor 3 , a shaft 4 , and an oil injection pipe 5 .

The housing assembly 1 may have a space S1 formed therein.

The stator 2 and the rotor 3 may be disposed inside the housing assembly 1 . The stator 2 and the rotor 3 may be disposed in the space S1 . The housing assembly 1 can protect the stator 2 and the rotor 3 .

The housing assembly 1 may be configured as a combination of a plurality of members. The housing assembly 1 may include a motor housing 11 having a space S1 formed therein, and at least one motor cover 12 and 13 covering the space S1 .

The housing assembly 11 may be provided with a terminal block 17 to which the bus bar 16 is fixed, and the terminal block 17 may be mounted on any one of the pair of motor covers 12 and 13 . .

The bus bar 16 connects the inverter 14 and the terminal block 17 , and one end of the bus bar 16 may be connected to the inverter 14 , and the other end of the bus bar 16 is the terminal block 17 . ) can be connected to

The inverter 14 may include a power device such as an IGBT for applying power to the stator 2 . The inverter 14 may be connected to the PCB 15 . The PCB 15 may be a motor control board capable of controlling a motor. Various control components such as semiconductor devices for controlling a motor may be disposed in the PCB 15 .

An inverter accommodating space S2 in which the inverter 14 and the PCB 15 are accommodated may be formed in the motor housing 11 .

The inverter accommodating space S2 and the space S1 may be partitioned in the motor housing 11 . The inverter accommodating space (S2) may be formed outside the space (S1). The inverter accommodating space S2 and the space S1 may be partitioned from each other by a barrier positioned therebetween. The inverter accommodating space (S2) may be located higher than the space (S1).

As described above, when the inverter 14 and the PCB 15 are accommodated in the motor housing 1 , the inverter 14 and the PCB 15 may become a part of the motor.

Meanwhile, the inverter 14 and the PCB 15 may be disposed outside the motor housing 1 . In this case, the bus bar 16 connected to the inverter 14 outside the motor is extended to the motor and a terminal block. (17) can be connected.

Both sides of the motor housing 11 may be opened in the space S1 , and the housing assembly 1 may include at least one motor cover 12 and 13 .

The motor may include a pair of motor covers 12 and 13 . The pair of motor covers 12 and 13 may be motor covers covering the space S1.

Any one 12 of the pair of motor covers 12 and 13 may cover one surface of the motor housing 11 , and the other 13 of the pair of motor covers 12 and 13 is the motor housing. The other side of (11) can be blocked.

One of the pair of motor covers 12 and 13 may be a front cover coupled to one end of the motor housing 11 , and the other of the pair of motor covers 12 and 13 is spaced apart from the front cover. It may be a rear cover coupled to the other end of the motor housing 11 .

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

Bearings 19A and 19B may be mounted on the motor cover. A bearing for rotatably supporting the shaft 4 may be mounted on each of the pair of motor covers 12 and 13 . A rear bearing 19A for supporting one side of the shaft 4 may be mounted on any one of the pair of motor covers 12 and 13, and the other of the pair of motor covers 12 and 13 has A front bearing 19B for supporting the other side of the shaft 4 may be mounted.

Meanwhile, the motor may further include a terminal block cover 20 covering the terminal block 17 . The terminal block cover 20 may be fastened to one of the motor housing 11 and the pair of motor covers 12 and 13 using a fastening member such as a screw or a hook.

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 periphery 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 unit 23 disposed inside the stator core 21 , and an outer coil unit 24 extending from the inner coil unit 23 to the outside of the stator core 21 . have.

The outer coil unit 24 may be spaced apart from the outer circumference 60A of the impeller 60 to be described later in the radial direction Y of the shaft 4 .

Oil sprayed in the centrifugal direction from the impeller 60 may flow to the outer coil part 24 , and the outer coil part 24 may be cooled by the oil sprayed from the impeller 60 . Oil sprayed in the centrifugal direction from the impeller 60 may cool the outer coil unit 24 while flowing along the outer coil unit 24 .

Meanwhile, a lead wire 25 connected to the bus bar 16 may be connected to the stator 2 as shown in FIG. 1 . One end of the lead wire 25 may be connected to the stator 2 , and the other end of the lead wire 25 may extend to the terminal block 17 to be connected to the bus bar 16 .

The rotor 3 may be mounted on the shaft 4 . The rotor 3 may be rotatably positioned inside the stator 2 . The rotor 3 may have a hollow cylindrical shape, 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. The rotor 3 may include a rotor core 31 and at least one magnet 32 .

A plurality of steel plates may be stacked on the rotor core 31 . The rotor core 31 may have a hollow cylindrical shape. A shaft through hole 33 through which the shaft 4 passes may be formed in the rotor core 31 .

A magnet mounting portion may be formed on 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 mounting portion may be formed to penetrate through the rotor core 31 .

The magnet 32 may be mounted on 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 on the rotor core 31 .

The rotor 3 may include a pair of end plates 34 and 35 spaced apart in the longitudinal direction X of the shaft 4 .

A shaft through hole 36 through which the shaft 4 passes may be formed in the end plates 34 and 35 .

One side of the end plates 34 and 35 may face the rotor core 31 , and the other side may face the motor covers 12 and 13 .

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

The shaft 4 may be disposed to pass through the housing assembly 1 , and the rotor 3 and the bearings 19A and 19B may be mounted to the shaft 4 to be spaced apart from each other.

The shaft 4 may include an end projecting out of the housing assembly 1 . An end of the shaft 4 protruding to the outside of the housing assembly 1 may be connected to a gearbox of a vehicle or an axle of a wheel.

The oil injection pipe 5 may be disposed inside the motor to inject oil into the motor. The oil injection pipe 5 may be mounted on the housing assembly 1 . The oil injection pipe 5 may be mounted inside the housing assembly 1 and may be protected by the housing assembly 1 .

The oil injection pipe 5 may be mounted to the housing assembly 1 to be spaced apart from the rotor 3 .

The oil injection pipe 5 may be mounted on the motor housing 11 or mounted on the motor covers 12 and 13 . When the oil injection pipe 5 is mounted on the motor housing 11 , when the motor covers 12 and 13 are disassembled for servicing the motor, the oil injection pipe 5 may maintain a mounted state on the motor housing 11 . When the oil injection pipe 5 is mounted on the motor housing 11 , the service of the motor may be facilitated.

The oil injection pipe 5 may be mounted to the motor housing 11 to be spaced apart from the rotor 3 . The oil injection pipe 5 may be mounted to the motor housing 11 to be spaced apart from each of the motor covers 12 and 13 . The oil injection pipe 5 may be mounted to the motor housing 11 to be spaced apart from each of the stator 2 and the motor covers 12 and 13 .

The oil injection pipe 5 may be an outer injection pipe that injects oil from the outside of the rotor 3 toward the outer surface of the rotor 3 .

An oil passage P through which oil passes, and at least one rotor cooling hole 51 for spraying the oil of the oil passage P toward the outer surface of the rotor 4) may be formed in the oil injection pipe 5. have.

The oil injected from the oil injection pipe 5 to the outer surface of the rotor 3 may come into contact with the rotor 3 to cool the rotor 3 . The oil that has cooled the rotor 3 may be scattered around the rotor 3 by the rotor 3 , and the oil scattered around the rotor 3 flows to the stator 2 and moves the stator 2 . can be cooled

As shown in FIG. 2 , the motor may further include at least one oil inlet 71 , 72 and an oil outlet 73 .

The oil inlets 71 and 72 may be mounted to protrude outward from the upper portion of the motor housing 11 . A plurality of oil inlets 71 and 72 may be connected to the upper portion of the motor housing 11 .

The oil injection pipe 5 may be connected to the oil inlets 71 and 72 . The oil introduced into the oil inlet may be introduced into the oil injection pipe 5 and may pass through the oil injection pipe 5 .

The oil injection pipe 5 may correspond to the oil inlets 71 and 72 1:1. The oil injection pipe 5 may be provided in plurality, such as the oil inlets 71 and 72 . In this case, the oil introduced into the plurality of oil inlets 71 and 72 from the outside of the motor may be dispersed into a wider area inside the motor by the plurality of oil injection pipes 5A and 5B.

The oil injection pipe 5 may be horizontally disposed long inside the motor housing 11 .

The oil injection pipe 5 may be mounted to the motor housing 11 by a fastening member such as a screw. An oil injection pipe mounter 68 to which the oil injection pipe 5 is mounted as a fastening member may be formed on the upper portion of the motor housing 11 .

The oil outlet 73 may be mounted on the lower portion of the motor housing 11 to protrude to the outside.

Meanwhile, the motor may be connected to an oil cooler (not shown) for cooling oil and an oil tube (not shown). And, an oil pump may be mounted on the oil tube.

The oil tube may be connected to the oil inlets 71 and 72 and the oil outlet 73, and a vehicle equipped with a motor includes an oil cooler, an oil pump, an oil supply tube connected to the oil inlets 71 and 72, and an oil It may include an oil return tube connected to the outlet (73).

When the oil pump is driven, the oil can circulate through the oil cooler, the oil pump, and the motor, and the oil cooled by the oil cooler flows into the oil inlets 71 and 72 and then flows into the oil injection pipe 5 . After being guided to the oil passage P of the oil injection pipe 5, it may be injected into the motor.

Oil that has cooled the inside of the motor may fall to the lower inner portion of the motor, and the oil that has fallen to the inner lower portion of the motor may flow out of the motor through the oil outlet 73 .

The oil injection pipe 5 may include a plurality of rotor cooling holes 51 , and the oil injection pipe 5 may distribute oil to the outer surface of the rotor 3 through the plurality of rotor cooling holes 51 . have.

Referring to FIG. 4 , the interval L between the plurality of rotor cooling holes 51 may be smaller than the outer diameter D1 of the rotor 3 . The oil dispersed in the plurality of rotor cooling holes 51 may be sprayed to a plurality of points on the outer surface of the rotor 3 . A plurality of rotor cooling holes 51 may be spaced apart from each other in the longitudinal direction of the oil injection pipe 5 .

The motor may further include an oil scattering unit for scattering the oil sprayed from the oil injection pipe 5 to the outer surface of the rotor 3 to the periphery of the rotor 3 .

The oil scattering part may be a part of the rotor 3 , and the oil spraying pipe 5 may spray oil to the oil scattering part of the rotor 3 .

The oil scattering unit may receive the oil sprayed from the oil injection pipe 5 and scatter around it. The oil scattering part may be formed in a shape capable of maximizing the heat dissipation performance of the motor while minimizing the air force (Aerodynamic force: the force and moment that the air flow exerts on the object) acting on the rotor 3 .

In addition, the oil scattering part may have a different pattern for scattering oil depending on the formation position thereof. The oil scattering portion is preferably formed at a position that can most evenly scatter oil to the stator 2 among the rotor 3 .

The oil scattering unit of this embodiment may include an impeller 60 protruding from the outer surface of at least one of the pair of end plates 34 and 35 . The impeller 60 may receive the oil sprayed from the oil injection pipe 5 and forcibly flow in the centrifugal direction. The impeller 60 may be accelerated by receiving the oil injected from the oil injection pipe 5 , and the oil accelerated by the impeller 60 may be rapidly scattered around.

The impeller 60 may be formed in a region of the rotor 3 that is not directly surrounded by the stator core 21 . The impeller 60 may receive the oil sprayed from the oil injection pipe 5 in a wide area.

The impeller 60 can spread the oil widely in the centrifugal direction when the rotor 3 rotates, and the oil flowing in the centrifugal direction to the impeller 60 is guided to the outer coil part 24 of the stator 2 . can

As described above, for the flow and acceleration of oil, the rotor cooling hole 51 of the oil injection pipe 5 may be opened in a direction for spraying oil toward the impeller 60 .

Hereinafter, the impeller 60 will be described in detail as follows.

When there are a plurality of oil injection pipes 5 , a plurality of impellers 60 may be formed inside the motor.

When the motor includes two oil injection pipes 5A and 5B spaced apart from each other, two impellers 60 may be formed inside the motor.

In this case, the oil injected from any one (5A) of the two oil injection pipes (5) may be guided to any one (60A) of the two impellers 60 and spread in the centrifugal direction, and the two oil injection pipes ( 5) The oil sprayed from any one (5B) may be guided to any one (60B) of the two impellers 60 and spread in the centrifugal direction.

In this embodiment, it is also possible for a plurality of oil injection pipes to inject oil into one impeller 60, and it is of course also possible that the oil injection pipe and the impeller correspond to 1:1.

The impeller 60 may protrude toward the motor covers 12 and 13 on the side facing the motor covers 12 and 13 among both surfaces of the end plates 34 and 35 .

When the motor includes two oil injection pipes 5A and 5B, the impeller 60 may be formed on a pair of end plates 34 and 35, respectively. In this case, the motor may include a pair of impellers 60A and 60B.

Any one 60A of the pair of impellers 60A and 60B may be formed on the end plate 34 closer to the rear bracket 12 , and may be formed to protrude toward the rear bracket 12 .

In addition, the other 60B of the pair of impellers 60A and 60B may be formed on the end plate 35 closer to the front bracket 13 , and may be formed to protrude toward the front bracket 13 . .

Such, a pair of impellers (60A, 60B) may be formed to be symmetrical to each other and different only in the protruding directions thereof.

Hereinafter, since all of the pair of impellers 60A and 60B are the same except for their protruding directions, their common configuration will be referred to as the impeller 60 and will be described.

The impeller 60 may spray the oil injected from the oil injection pipe 5 toward the outer surface of the rotor 3 in a centrifugal direction.

The impeller 60 may include a plurality of blades 62 .

The impeller 60 may further include an oil guide 61 in which a plurality of blades 62 are formed.

As the oil guide 61 approaches any one of the motor covers 12 and 13, the outer diameter D2 may be reduced.

Among the pair of impellers 60A and 60B, the oil guide 61 of the impeller 60A that is closer to the rear motor cover 12 may be formed to have a reduced outer diameter as it approaches the rear motor cover 12 .

Conversely, the oil guide 61 of the impeller 60B closer to the front motor cover 13 among the pair of impellers 60A and 60B may be formed to have a reduced outer diameter as it approaches the front motor cover 13. have.

The oil guide 61 may have a hollow shape to surround a portion of the shaft 4 . The oil guide 61 may have a shaft through hole 36 through which the shaft 4 passes.

The inner diameter D3 of the oil guide 61 may be greater than or equal to the outer diameter of the shaft 4 .

The oil guide 61 may change the direction of the oil guided along its outer surface in a centrifugal direction.

The plurality of blades 62 may be formed to protrude from the oil guide 61 . The plurality of blades 62 may protrude from the outer surface of the oil guide 61 .

To this end, each of the plurality of blades 62 includes a leading edge 63 of the leading end in the direction of guiding the fluid and a trailing edge 64 of the most rear end in the direction of guiding the fluid, referring to FIG. 4 . can do.

Each of the plurality of blades 62 may have an arc shape between the leading edge 63 and the trailing edge 64 .

Each of the plurality of blades 62 may be formed along a three-dimensional curved surface, and the leading edge 63 and the trailing edge 64 may face different directions, and when the impeller 60 rotates, the blade 62 ) can accelerate oil with low noise and high efficiency.

Each of the plurality of blades 62 may further include a blade tip 65 connecting the leading edge 63 and the trailing edge 64 .

The leading edge 63 may be formed closer to the shaft 4 than the trailing edge 64 .

The leading edge 63 may face the motor covers 12 and 13 , and the trailing edge 64 may face the outer coil portion 24 of the stator coil 22 .

As the oil is guided along the oil guide 61 and the blade 62, the flow direction can be gradually switched to the centrifugal direction, and the oil exiting the trailing edge 64 of the blade 62 is of the stator coil 22. It may flow toward the outer coil unit 24 .

The oil flowing from the oil injection pipe 5 to the impeller 60 can be accelerated while being guided along the oil guide 61 and the blade 62 of the impeller 60, and the accelerated oil is the stator coil 22. It can be scattered at a high speed toward the outer coil portion 24 of the.

An example of the impeller 60 may include both the oil guide 61 and the plurality of blades 62 as described above.

Of course, another example of the impeller 60 may include a plurality of blades 62 protruding from one surface of the end plate without a separate oil guide 61 .

Meanwhile, the rotor cooling hole 51 of the present embodiment may be opened toward a region in which the leading edge 63 of the impeller 60 is located. Here, the region where the leading edge 63 is positioned may be a region closer to the shaft 4 of the impeller 60 .

The impeller 60 may be divided into an inner area IA and an outer area OA based on the boundary 66 between the leading edge 63 and the blade tip 65 .

The impeller 60 may be divided into an inner area IA and an outer area OA based on an imaginary line O connecting the boundary 66 of each of the plurality of blades 62 .

The inner area IA may be defined as an area between the boundary 66 and the inner circumference of the oil guide 61 , and the outer area OA is defined as an area outside the inner area IA of the impeller 60 . can be

The oil injection pipe 5 is capable of injecting oil toward the inner region IA and capable of injecting oil toward the outer region OA.

When the oil injected from the oil injection pipe 5 is injected into the inner region IA, the contact time between the oil and the oil guide 61 is long, and the heat of the rotor 3 can be absorbed more efficiently.

On the other hand, when the oil injected from the oil injection pipe 5 is injected into the outer area OA, the contact time between the oil and the oil guide 61 is relatively short.

The rotor cooling hole 51 is preferably opened toward the region IA in which the leading edge 63 of the impeller 60 is located.

The oil introduced into the area IA where the leading edge 63 is located may be guided from the leading edge 63 to the trailing edge 64 while being guided by the oil guide 61 and the blade 62 , and such oil may be accelerated to a high speed by the impeller 60 .

On the other hand, the oil injection pipe 5 may inject oil to the rotor 3 as well as to the stator 2 . To this end, the stator cooling hole 52 for spraying the oil of the oil passage P toward the stator 2 may be formed in the oil injection pipe 5 .

The stator cooling hole 52 may be opened towards the stator 2 , in particular the stator coil 22 , as shown in FIGS. 3 and 4 . As shown in FIG. 3 , the opening direction of the stator cooling hole 52 may be different from that of the rotor cooling hole 51 . The stator cooling hole 52 may be spaced apart from the rotor cooling hole 51 as shown in FIG. 4 . The stator cooling hole 52 and the rotor cooling hole 51 may be formed to be spaced apart from the oil injection pipe 5 as shown in FIG. 4 .

The opening directions of the rotor cooling hole 51 and the stator cooling hole 52 may be different from each other. One of the rotor cooling holes 51 and the stator cooling holes 52 may be opened in a horizontal direction, and the other of the two may be opened in an oblique direction. One of the rotor cooling holes 51 and the stator cooling holes 52 may be opened in an inclined direction of the lower side, and the other of the two may be formed in an upper inclined direction.

Meanwhile, the oil injection pipe 5 may have a motor cover cooling hole 53 that has a different opening direction from the rotor cooling hole 51 and sprays oil toward the motor covers 12 and 13 .

The motor cover cooling hole 53 may have a different opening direction from each of the rotor cooling hole 51 and the stator cooling hole 52 .

The motor cover cooling hole 53 may spray coolant toward the periphery of the bearings 19A and 19B or the periphery of the terminal block 17 among the motor covers 12 and 13_, and the motor cover 12 ( 13) The oil cooled around the bearings 19A and 19B or around the terminal block 17 flows along the motor covers 12 and 13 while flowing along the bearings 19A and 19B or around the terminal block. It is possible to cool the periphery of (17).

The motor cover cooling hole 53 may be opened toward a region between the bearings 19A and 19B and the terminal block 17 of the motor cover 2 , and in this case, through the motor cover cooling hole 53 , The oil sprayed to the motor covers 12 and 13 may cool the bearings 19A and 19B and the terminal block 17, respectively.

The motor cover cooling hole 53 may include a plurality of motor cover cooling holes 53A and 53B that are opened in directions having different angles from each other. A plurality of motor cover cooling holes 53A and 53B are a bearing cooling hole 53A for spraying oil toward the periphery of the bearing 19A of the motor cover 12, and oil toward the periphery of the terminal block 17. It may include a terminal block cooling hole (53B) for spraying. The bearing cooling hole 53A and the terminal block cooling hole 53B may be opened in different directions. The bearing cooling hole 53A may be opened in a downward inclined direction, and the terminal block cooling hole 53B may be opened in an upward inclined direction.

It is also possible that the motor cover cooling hole 53 is formed only in one (5A) of the pair of oil injection pipes (5A) and (5B) which is closer to the terminal block (17).

In addition, the motor cover cooling hole 53 may be formed in each of the pair of oil injection pipes (5A, 5B).

When the rotor cooling hole 51, the stator cooling hole 52, and the motor cover cooling hole 53 can all be formed in the oil injection pipe 5, the oil injected from the oil injection pipe 5 is 3), the stator 2, the bearings 19A, 19B, and the terminal block 17 can all be cooled, and the motor can be quickly and efficiently radiated heat.

When the rotor cooling hole 51, the stator cooling hole 52, and the motor cover cooling hole 53 are all formed in the oil injection pipe 5, the number of the rotor cooling holes 51 and the number of the stator cooling holes 52 The sum of the number may be greater than the number of the motor cover cooling holes 53 . In this case, the motor can more efficiently cool the rotor 3 and the stator 2 that are relatively hot than the motor covers 12 and 13 .

Meanwhile, the motor covers 12 and 13 may include a bearing housing that surrounds the outer circumference of the bearing. At least one oil hole for guiding oil to the periphery of the bearing may be formed in the bearing housing. In addition, an oil chamber part in which an oil hole communicates and oil is collected may be formed in an upper portion of the bearing housing part.

Each of the rear motor cover 12 and the front motor cover 13 may include a bearing housing part, an oil hole, and an oil chamber part as described above.

5 is an enlarged view showing a rear motor cover and a rear bearing of a motor according to an embodiment of the present invention, and FIG. 6 is a partial cut-out showing a rear motor cover and a rear bearing of the motor according to an embodiment of the present invention It is a cross section.

Referring to FIGS. 5 and 6 , a bearing housing part 12A surrounding the outer circumference of the rear bearing 19A may be formed on the rear motor cover 12 .

An oil hole 12B for guiding the oil sprayed from the oil injection pipe 5A to the rear motor cover 12 to the periphery of the rear bearing 19A is formed in the bearing housing portion 12A of the rear motor cover 12. can

In addition, an oil hole 12B communicates with the upper portion of the bearing housing 12A of the rear motor cover 12, and the oil sprayed from the oil injection pipe 5A to the rear motor cover 12 is collected and then the oil hole 12B ) may be formed with an oil chamber portion 12C that flows.

The oil flowing from the oil chamber part 12C of the rear motor cover 12 to the oil hole 12B of the rear motor cover 12 not only cools the rear bearing 19A but also lubricates the rear bearing 19A. have. That is, the motor can minimize the friction loss of the rear bearing 19A, and the efficiency of the motor and the lifespan of the rear bearing 19A can be increased.

And, FIG. 7 is an enlarged view showing the front motor cover and front bearing of the motor according to an embodiment of the present invention, and FIG. 8 is an enlarged view showing the front motor cover and front bearing of the motor according to an embodiment of the present invention. Some cut-out cross-sections.

Referring to FIGS. 7 and 8 , a bearing housing part 13A surrounding the outer circumference of the front bearing 19B may be formed on the front motor cover 13 .

An oil hole 13B is formed in the bearing housing 13A of the front motor cover 13 to guide the oil sprayed from the oil injection pipe 5B to the front motor cover 13 to the periphery of the front bearing 19B. can

Then, an oil hole 13B communicates with the upper portion of the bearing housing 13A of the front motor cover 13, and the oil sprayed from the oil injection pipe 5B to the front motor cover 13 is collected and then the oil hole 13B ) may be formed with an oil chamber part 13C that flows.

The oil flowing from the oil chamber part 13C of the front motor cover 13 to the oil hole 13B of the front motor cover 13 can not only cool the front bearing 19B but also lubricate the front bearing 19B. have. That is, the motor can minimize the friction loss of the front bearing 19B, and the efficiency of the motor and the life of the front bearing 19B can be increased.

9 is a perspective view illustrating an oil injection pipe of a motor according to an embodiment of the present invention.

The oil injection pipe 5 is coupled to the tube 5C in which the oil passage P, the rotor cooling hole 51, the stator cooling hole 52, and the motor cover cooling hole 53 are formed, and the tube 5C protruding from the tube 5C. It may include a piece 5D.

A fastening hole 5E through which a fastening member such as a screw passes may be formed in the fastening piece 5D. The fastening piece 5D may be formed closer to one of the one end and the other end of the tube 5C, and may be mounted inside the motor housing 11 by a fastening member such as a screw.

The fastening piece 5D may be fastened to the oil injection pipe mounter 68 (refer to FIG. 2 ) mounted inside the motor housing 11 .

10 is an enlarged cross-sectional view of the inside of a motor according to another embodiment of the present invention.

In this embodiment, a shaft impeller 60 ′ for scattering oil on the outer circumferential surface of the shaft 4 may be provided.

The shaft impeller 60 ′ is capable of flowing oil together with the impeller 60 formed in the rotor 3 . In this case, the motor may include both the impeller 60 formed on the rotor 3 and the shaft impeller 60 ′ formed on the shaft 4 .

An example of the shaft impeller 60' may include both the oil guide 61' and the blade 62' formed on the oil guide 61'. It is possible that another example of the shaft impeller 60' does not include the oil guide 61', but includes only the blade 62'.

The oil guide 61' of the shaft impeller 60' is different from the oil guide 61 of the impeller 60 in the formation position and size, and the configuration and action other than the formation position and size of the impeller 60 Since it is the same as the oil guide 61 of the detailed description thereof will be omitted.

The blade 62' of the shaft impeller 60' is different from the blade 62 of the impeller 60 in its formation position and size, and other configurations and actions other than the formation position and size are the blades of the impeller 60. Since it is the same as (62), a detailed description thereof will be omitted.

The blade 62' of the shaft impeller 60', like the blade 62 of the impeller 60, may include a leading edge, a trailing edge and a blade tip. The blade 62' may have a curved shape between the leading edge and the trailing edge.

The outer perimeter of the shaft impeller 60' may be directed toward the outer coil part 24 of the stator coil 22 in the radial direction Y of the shaft 4, and the shaft impeller 60' supplies oil to the stator coil ( 22), it can flow toward the outer coil part 24.

The shaft 4 may include a small diameter portion 4A and a large diameter portion 4B having a larger outer diameter than the small diameter portion 4A.

The shaft impeller 60 ′ may be formed to protrude from the outer circumferential surface of the shaft 4 in the radial direction of the shaft 4 . The shaft impeller 60 ′ may be formed to protrude in the radial direction of the shaft 4 from the outer circumferential surface of at least one of the small diameter portion 4A and the large diameter portion 4B. The shaft impeller 60' may be formed on the side surface 4D of the outer circumferential surface 4C and the side surface 4D of the large-diameter portion 4B. The shaft impeller 60' may be formed on the side surface 4D of the large-diameter portion 4B and the outer circumferential surface of the small-diameter portion 4A.

In this embodiment, oil may be injected from the rotor cooling hole 51 of the oil injection pipe 5 , and the oil injected from the rotor cooling hole 51 is injected to the impeller 60 formed in the rotor 3 to the rotor After cooling (3), it can spread to the periphery of the impeller (60).

On the other hand, the oil injection pipe 5 of the present embodiment may be formed with a shaft cooling hole (not shown) that is opened to spray the oil toward the shaft impeller 60 ' provided on the outer peripheral surface of the shaft (4).

When oil is injected from the rotor cooling hole 51 , oil may be injected from the shaft cooling hole, and the oil injected from the shaft cooling hole is injected to the shaft impeller 60 ′ formed in the shaft 4 , and the shaft 4 ) can be cooled and spread around the shaft impeller 60'.

11 is an enlarged cross-sectional view of the inside of a motor according to another embodiment of the present invention.

In this embodiment, a shaft groove 46 for scattering oil droplets may be formed on the outer circumferential surface of the shaft 4, and other configurations and actions other than the shaft groove 46 are in one embodiment or another embodiment of the present invention. Since they are the same as or similar to , the same reference numerals are used, and detailed descriptions thereof are omitted.

This embodiment may include an oil injection pipe 5 for spraying oil into the inside of the motor, and some of the oil injected from the oil injection pipe 5 may flow along the outer surface of the shaft 4, the shaft It can be scattered around by the groove (46). The scattered oil may flow to the stator 2 , the rotor 3 , and the motor covers 12 and 13 .

The above description is merely illustrative of the technical spirit of the present invention, and various modifications and variations will be possible without departing from the essential characteristics of the present invention by those skilled in the art to which the present invention pertains.

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

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

Claims (13)

a housing assembly 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; and
and an oil injection pipe mounted to the housing assembly to be spaced apart from the rotor,
The oil injection pipe
the oil passage through which the oil passes; and
At least one rotor cooling hole for spraying the oil in the oil passage toward the outer surface of the rotor is formed,
The housing assembly is
a motor housing with a space formed therein; and
and a motor cover having a bearing that covers the space of the motor housing and supports the shaft,
The oil injection pipe has a motor cover cooling hole that is different from the rotor cooling hole in an opening direction and sprays oil toward the motor cover.
motor. The method of claim 1,
The rotor includes a pair of end plates spaced apart in the longitudinal direction of the shaft,
An impeller protrudes from the outer surface of at least one of the pair of end plates,
The rotor cooling hole is opened in a direction for spraying oil toward the impeller. 3. The method of claim 2,
The impeller includes a plurality of blades, the leading edge is closer to the shaft than the trailing edge,
The rotor cooling hole is opened toward a region where a leading edge of the impeller is located. 3. The method of claim 2,
The stator includes a stator core surrounding the outer periphery of the rotor, and a stator coil mounted on the stator core,
The stator coil is
an inner coil disposed inside the stator core;
and an outer coil portion extending from the inner coil portion to the outside of the stator core and spaced apart from an outer circumference of the impeller in a radial direction of the shaft. 3. The method of claim 2,
The impeller is a motor that protrudes toward the motor cover on a side facing the motor cover among both surfaces of the end plate. 6. The method of claim 5,
The impeller is a motor including a plurality of blades protruding from the outer surface, the outer diameter is reduced as it approaches the motor cover, and an oil guide for guiding the oil in a centrifugal direction. 6. The method of claim 5,
at least one oil inlet mounted to the outside of the motor housing to protrude;
It further comprises an oil outlet mounted to protrude to the outside on the lower part of the motor housing,
The oil injection pipe is connected to the oil inlet, and the motor is horizontally disposed inside the housing. The method of claim 1,
A plurality of rotor cooling holes are formed in the oil injection pipe,
The distance between the plurality of rotor cooling holes is smaller than the outer diameter of the motor. The method of claim 1,
The motor has a stator cooling hole for spraying oil toward the stator in the oil injection pipe. delete a housing assembly 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; and
and an oil injection pipe mounted to the housing assembly to be spaced apart from the rotor,
The oil injection pipe
the oil passage through which the oil passes; and
At least one rotor cooling hole for spraying the oil in the oil passage toward the outer surface of the rotor is formed,
The housing assembly is
a motor housing with a space formed therein; and
and a motor cover having a bearing that covers the space of the motor housing and supports the shaft,
The motor cover further comprises a bearing housing portion surrounding the outer periphery of the bearing,
At least one oil hole for guiding oil to the periphery of the bearing is formed in the bearing housing,
A motor in which the oil hole communicates with the upper part of the bearing housing part and an oil chamber part in which oil is collected is formed. The method of claim 1,
A motor in which a shaft impeller having a plurality of blades for scattering oil is formed on the outer periphery of the shaft. The method of claim 1,
A motor in which a shaft groove for scattering oil is formed on the outer periphery of the shaft.

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