WO2018225877A1 - Motor - Google Patents

Abstract

The present embodiment comprises: a housing assembly having a space formed on the inside thereof; a stator disposed in the housing assembly; a rotor positioned in the stator in a rotatable manner; a shaft on which the rotor is mounted; and an oil spraying pipe mounted on the housing assembly so as to spray oil onto the outer surface of the rotor, and, in the embodiment, the oil spraying pipe has: an oil flow path through which oil passes; and at least one rotor cooling hole for spraying the oil of the oil flow path onto the outer surface of the rotor. Thus, present embodiment has the advantages of lower maintenance cost than when the inside of the motor is cooled by a compressive coolant, and a simpler structure and easier manufacturing process than when flow paths, through which the oil passes, are respectively formed in the shaft and the rotor.

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 (or electric 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 that is not only low in maintenance cost but also easy to manufacture and efficient heat dissipation.

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 injection pipe mounted on the shaft and the housing assembly in which the rotor is mounted to be spaced apart from the rotor, the oil injection pipe including an oil passage through which oil passes; At least one rotor cooling hole for injecting oil into the oil passage toward the outer surface of the rotor may be formed.

The rotor may comprise a pair of end plates spaced in the longitudinal direction of the shaft. The impeller may protrude from at least one outer surface of the pair of end plates. The rotor cooling hole may be opened in the direction of spraying 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 be open toward the region where the leading edge of the impeller is located.

The stator may include a stator core surrounding the outer circumference of the rotor and a stator coil mounted to 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 radially spaced apart from the outer circumference of the impeller and the shaft.

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

The impeller may protrude toward the motor cover on either side of the end plater toward the motor cover.

The impeller may include an oil guide for guiding oil in a centrifugal direction. The plurality of blades may protrude from the outer surface of the oil guide. As the oil guide gets closer to the motor cover, the outer diameter may be reduced.

The motor may further include at least one oil inlet protruding outwardly from the top of the motor housing, and an oil outlet protruding outwardly from the bottom of the motor housing.

The oil injection pipe may be connected to the oil inlet and disposed in the horizontal direction in the housing.

The rotor cooling hole may be formed in plural in the oil injection pipe. The spacing of the plurality of rotor cooling holes may be smaller than the 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 which is different from the rotor cooling hole in the opening direction and injects oil toward the motor cover.

The motor cover may further include a bearing housing part surrounding the outer circumference of the bearing. At least one oil hole may be formed in the bearing housing to guide oil to the periphery of the bearing. In addition, an oil chamber may be formed in the upper portion of the bearing housing to communicate with the oil hole.

The oil injection pipe may be provided with a stator cooling hole for injecting oil toward the stator.

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

At the outer circumference of the shaft may be formed a shaft groove for scattering oil.

The present invention has an advantage that the maintenance cost is cheaper than when the compressed refrigerant is injected into the motor, and the structure is simpler and easier to manufacture than the case where the oil passage passes through each of the shaft and the rotor.

In addition, since the oil injected into the impeller in the oil injection pipe is scattered as it is accelerated by the impeller, the effect of the oil splash can be maximized, there is an advantage that the cooling performance can be improved.

In addition, there is an advantage that the heat of the rotor can be more efficiently radiated by maximizing the time that 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,

Figure 2 is a perspective view of the inside of the 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;

Figure 4 is a side view showing the rotor and stator and the oil injection pipe of the 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 cutaway 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 of the front motor cover and the front bearing of the motor according to an embodiment of the present invention,

8 is a partially cutaway 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 the 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 reference to the accompanying drawings.

1 is a cross-sectional view of a motor according to an embodiment of the present invention, Figure 2 is a perspective view showing the inside of the motor according to an embodiment of the present invention, Figure 3 is an impeller and oil according to an embodiment of the present invention 4 is an enlarged cross-sectional view of the injection pipe, and FIG. 4 is a side view of 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 arranged in the space S1. The housing assembly 1 can protect the stator 2 and the rotor 3.

The housing assembly 1 may be composed of 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. One end of the bus bar 16 may be connected to the inverter 14, and the other end of the bus bar 16 may be connected to the terminal block 17. ) Can be connected.

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 controller board capable of controlling the motor. In the PCB 15, various control components such as a semiconductor element for controlling a motor may be disposed.

In the motor housing 11, an inverter accommodation space S2 in which the inverter 14 and the PCB 15 may be accommodated may be formed.

The inverter accommodating space S2 and the space S1 may be partitioned in the motor housing 11. The inverter accommodation 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 barriers positioned therebetween. The inverter accommodation 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 be part of the motor.

On the other hand, 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 to the terminal block (17) can be connected.

The motor housing 11 may have both sides of the space S1 open, and the housing assembly 1 may include at least one motor cover 12 and 13.

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

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

One of the pair of motor covers 12, 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, 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 comprise at least one bearing 19A, 19B supporting the shaft 4.

The bearings 19A and 19B can be mounted to the motor cover. Each of the pair of motor covers 12 and 13 may be equipped with a bearing rotatably supporting the shaft 4. One of the pair of motor covers 12 and 13 may be equipped with a rear bearing 19A supporting one side of the shaft 4, and the other of the pair of motor covers 12 and 13 may be mounted. The front bearing 19B supporting the other side of the shaft 4 may be mounted.

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

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 outer circumference 60A of the impeller 60 to be described later in the radial direction Y of the shaft 4.

The oil injected 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 injected from the impeller 60. The oil injected in the centrifugal direction from the impeller 60 may cool the outer coil part 24 while flowing in the outer coil part 24.

Meanwhile, as shown in FIG. 1, the stator 2 may have a lead wire 25 connected to the bus bar 16. 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 and be connected to the bus bar 16.

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. The rotor 3 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. The rotor core 31 may have a hollow cylindrical shape. The rotor core 31 may have a shaft through hole 33 through which the shaft 4 penetrates.

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 mounting portion may be formed to penetrate the rotor core 31.

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.

End plate 34 and 35 may be formed with a shaft through hole 36 through which the shaft 4 passes.

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

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 housing assembly 1, and 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 housing assembly 1. The protruding end of the housing assembly 1 of the shaft 4 can be connected to the gearbox of the vehicle or to the axle of the 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 to 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 so as to be spaced apart from the rotor 3.

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

The oil injection pipe 5 may be mounted to the motor housing 11 so as to be spaced apart from the rotor 3. The oil injection pipe 5 may be mounted to the motor housing 11 so as 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 so as 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 for injecting oil toward the outer surface of the rotor 3 from the outside of the rotor 3.

The oil injection pipe 5 may be formed with an oil passage P through which oil passes and at least one rotor cooling hole 51 for injecting oil from the oil passage P toward the outer surface of the rotor 4. have.

The oil injected from the oil injection pipe 5 to the outer surface of the rotor 3 may be in contact with the rotor 3 to cool the rotor 3. The oil that cools the rotor 3 may be scattered around the rotor 3 by the rotor 3, and thus the oil scattered around the rotor 3 flows to the stator 2 to flow the stator 2. Can be cooled.

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

The oil inlets 71 and 72 may be mounted to the outside of the motor housing 11 to protrude outward. The oil inlets 71 and 72 may be connected to a plurality of upper portions 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 flow into the oil injection pipe 5 and pass through the oil injection pipe 5.

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

The oil injection pipe 5 may be disposed long in the horizontal direction 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 spray pipe mounter 68 may be formed at an upper portion of the motor housing 11 to mount the oil spray pipe 5 as a fastening member.

The oil outlet 73 may be mounted to protrude outward from the bottom of the motor housing 11.

On the other hand, 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 may be connected to the oil inlets 71 and 72 and the oil outlet 73, and the vehicle equipped with the motor may be an oil cooler, an oil pump and an oil supply tube and oil connected to the oil inlets 71 and 72. It may include an oil recovery tube connected to the outlet 73.

When the oil pump is driven, the oil can circulate the oil cooler, the oil pump and the motor, and the oil cooled in the oil cooler flows into the oil inlets 71 and 72 and then inside the oil spray pipe 5. It can be flowed in, and after being guided to the oil flow path (P) of the oil injection pipe (5) can be injected into the motor.

The oil cooling the inside of the motor may fall on the inner lower portion of the motor, and the oil dropped 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 distance L of the plurality of rotor cooling holes 51 may be smaller than the outer diameter D1 of the rotor 3. Oil dispersed in the plurality of rotor cooling holes 51 may be injected to a plurality of points on the outer surface of the rotor 3. The plurality of rotor cooling holes 51 may be spaced apart in the longitudinal direction of the oil injection pipe (5).

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

The oil splash portion may be part of the rotor 3, and the oil spray pipe 5 may spray oil into the oil splash portion of the rotor 3.

The oil scattering unit may receive oil sprayed from the oil spray pipe 5 and scatter the surroundings. The oil scattering unit may be formed in a shape capable of maximizing the heat dissipation performance of the motor while minimizing Aerodynamic forces (forces and moments applied to the object by the flow of air) acting on the rotor 3.

The oil scattering portion may have a different pattern of scattering oil depending on the formation position thereof. The oil scattering portion is preferably formed at a position where oil can be most evenly scattered by the stator 2 in the rotor 3.

The oil scattering part of the present embodiment may include an impeller 60 protruding on an outer surface of at least one of the pair of end plates 34 and 35. The impeller 60 may receive the oil injected from the oil injection pipe 5 and force flow in the centrifugal direction. The impeller 60 may accelerate by receiving oil injected from the oil injection pipe 5, and the oil accelerated by the impeller 60 may be quickly scattered to the surroundings.

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

When the impeller 60 rotates the rotor 3, the oil can be widely spread in the centrifugal direction, 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 be.

As described above, in order to flow and accelerate the oil, the rotor cooling hole 51 of the oil injection pipe 5 may be opened in the direction of injecting oil toward the impeller 60.

Hereinafter, the impeller 60 will be described in detail.

When the impeller 60 has 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 ( The oil injected from any one of 5) may be guided to one of the two impellers 60B and spread in the centrifugal direction.

In this embodiment, the plurality of oil injection pipes may inject oil into one impeller 60, and the oil injection pipes and the impellers may be 1: 1 corresponded.

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

When the motor includes two oil injection pipes 5A and 5B, the impeller 60 may be formed on the 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 in the end plate 34 closer to the rear bracket 12 and may protrude toward the rear bracket 12.

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

Such a pair of impellers 60A and 60B may be formed symmetrically with each other only in the protruding direction thereof.

Hereinafter, since a pair of impeller 60A (60B) is the same except for the protruding direction, the common structure is called the impeller 60, and it demonstrates.

The impeller 60 may inject the oil injected toward the outer surface of the rotor 3 from the oil injection pipe 5 in the 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 gets closer to any one of the motor covers 12 and 13, the outer diameter D2 may be reduced.

The oil guide 61 of the impeller 60A closer to the rear motor cover 12 among the pair of impellers 60A and 60B may be formed such that its outer diameter decreases as it approaches the rear motor cover 12.

On the contrary, 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 such that its outer diameter decreases as it approaches the front motor cover 13. have.

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

The inner diameter D3 of the oil guide 61 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 61 may divert the oil guided along its outer surface in the 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 at the leading end in the direction of guiding the fluid and trailing edge 64 at the rear end in the direction of guiding the fluid. can do.

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

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 cover 12, 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 changed to the centrifugal direction, and the oil exiting the trailing edge 64 from the blade 62 is transferred to 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 may be accelerated while being guided along the oil guide 61 and the blade 62 of the impeller 60, and this accelerated oil may be accelerated by the stator coil 22. Can be scattered at a high speed toward the outer coil part 24.

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

Another example of the impeller 60 may also include a plurality of blades 62 protruding from one surface of the end plate without a separate oil guide 61.

On the other hand, the rotor cooling hole 51 of the present embodiment may be open toward the region where the leading edge 63 of the impeller 60 is located. Here, the region where the leading edge 63 is located may be a region closer to the shaft 4 of the impeller 60.

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

The inner region IA may be defined as the region between this boundary 66 and the inner circumference of the oil guide 61, and the outer region OA is defined as the outer region of the inner region IA of the impeller 60. Can be.

The oil injection pipe 5 can spray oil toward the inner region IA, and can spray 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 region OA, the contact time of 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 can be guided from the leading edge 63 to the trailing edge 64 while being guided to the oil guide 61 and the blade 62. May be accelerated at high speed by the impeller 60.

On the other hand, the oil injection pipe 5 may not only inject oil into the rotor 3 but also inject oil into the stator 2. To this end, the oil injection pipe 5 may be formed with a stator cooling hole 52 for injecting the oil in the oil passage (P) toward the stator (2).

The stator cooling hole 52 may be opened toward the stator 2, in particular, the stator coil 22, as shown in FIGS. 3 and 4. As shown in FIG. 3, the stator cooling hole 52 may have a different opening direction from 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 rotor cooling holes 51 and the stator cooling holes 52 may have different opening directions from each other. One of the rotor cooling holes 51 and the stator cooling holes 52 may be opened in the horizontal direction, and the other of the rotor cooling holes 51 and the stator cooling holes 52 may be opened in the inclined direction. One of the rotor cooling hole 51 and the stator cooling hole 52 may be opened in the inclined direction of the lower side, and the other of the rotor cooling holes 51 and the stator cooling hole 52 may be formed in the inclined direction of the upper side.

On the other hand, the oil injection pipe 5 may be formed with a motor cover cooling hole 53 which is different from the rotor cooling hole 51 in the opening direction and injects 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 can inject cooling water toward the periphery of the bearings 19A and 19B and the periphery of the terminal block 17 among the motor covers 12 and 13_, and the motor cover 12 ( The oil cooled to the periphery of the bearings 19A and 19B or to the periphery of the terminal block 17 among the 13 flows along the motor covers 12 and 13 to the periphery of the bearings 19A and 19B or the terminal block. The periphery of (17) can be cooled.

The motor cover cooling hole 53 may be opened toward the area between the bearings 19A and 19B and the terminal block 17 of the motor cover 2, in which case, through the motor cover cooling hole 53. Oil injected into 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 open in directions different from each other. The plurality of motor cover cooling holes 53A and 53B provide oil toward the periphery of the terminal block 17 and bearing cooling holes 53A for injecting oil toward the periphery of the bearing 19A of the motor cover 12. The terminal block cooling hole 53B may be injected. The bearing cooling holes 53A and the terminal block cooling holes 53B may be opened in different directions from each other. The bearing cooling holes 53A may be opened in the lower inclined direction, and the terminal block cooling holes 53B may be opened in the upper inclined direction.

The motor cover cooling hole 53 may be formed only in any one of the pair of oil injection pipes 5A and 5B 5A 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 and 5B.

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

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

On the other hand, the motor cover 12, 13 may include a bearing housing portion surrounding the outer circumference of the bearing. At least one oil hole may be formed in the bearing housing to guide oil to the periphery of the bearing. In addition, an oil chamber may be formed in the upper portion of the bearing housing to communicate with the oil hole.

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.

FIG. 5 is an enlarged view of 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 cutout showing the rear motor cover and rear bearing of a motor according to an embodiment of the present invention. It is a cross section.

5 and 6, the rear motor cover 12 may be formed with a bearing housing portion 12A surrounding the outer circumference of the rear bearing 19A.

In the bearing housing portion 12A of the rear motor cover 12, an oil hole 12B for guiding oil injected from the oil injection pipe 5A to the rear motor cover 12 toward the periphery of the rear bearing 19A is formed. Can be.

In addition, the oil hole 12B communicates with the upper portion of the bearing housing portion 12A of the rear motor cover 12, and oil injected from the oil injection pipe 5A to the rear motor cover 12 collects, and then oil hole 12B. An oil chamber portion 12C flowing into) may be formed.

The oil flowing from the oil chamber portion 12C of the rear motor cover 12 to the oil hole 12B of the rear motor cover 12 can not only cool the rear bearing 19A but also lubricate the rear bearing 19A. have. That is, the motor can minimize the frictional loss of the rear bearing 19A, and the efficiency of the motor and the life of the rear bearing 19A can be increased.

7 is an enlarged view of a front motor cover and a front bearing of a motor according to an embodiment of the present invention, and FIG. 8 is a front motor cover and a front bearing of a motor according to an embodiment of the present invention. Some cutaway sectional views.

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

In the bearing housing portion 13A of the front motor cover 13, an oil hole 13B for guiding oil injected from the oil injection pipe 5B to the front motor cover 13 to the periphery of the front bearing 19B is formed. Can be.

The oil hole 13B communicates with the upper portion of the bearing housing portion 13A of the front motor cover 13, and oil injected from the oil injection pipe 5B to the front motor cover 13 collects, and then the oil hole 13B. The oil chamber portion 13C flowing into) may be formed.

The oil flowing from the oil chamber portion 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 frictional 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 a tube 5C in which the oil flow path P, the rotor cooling hole 51, the stator cooling hole 52, and the motor cover cooling hole 53 are formed, and a protrusion protruding from the tube 5C. 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 side of 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 jet pipe mounter 68 (see FIG. 2) mounted in the motor housing 11.

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

The present embodiment may be provided with a shaft impeller 60 ′ for scattering oil on the outer circumferential surface of the shaft 4.

The shaft impeller 60 'can flow oil together with the impeller 60 formed in the rotor 3. In this case, the motor may include both an impeller 60 formed on the rotor 3 and a shaft impeller 60 'formed on the shaft 4.

One example of the shaft impeller 60 'may include both an oil guide 61' and a blade 62 'formed on the oil guide 61'. Another example of a shaft impeller 60 'does not include an oil guide 61', but may include only a blade 62 '.

The oil guide 61 ′ of the shaft impeller 60 ′ is different from the oil guide 61 of the impeller 60 in its formation position and size, and other configurations and actions other than its formation position and size are the impeller 60. Since the oil guide 61 is the same as the detailed description thereof will be omitted.

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

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

The outer circumference of the shaft impeller 60 ′ may face the outer coil portion 24 of the stator coil 22 in the radial direction Y of the shaft 4, and the shaft impeller 60 ′ may pass oil to the stator coil ( It can flow toward the outer coil part 24 of 22. As shown in FIG.

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 in the radial direction of the shaft 4 on the outer circumferential surface of the shaft 4. The shaft impeller 60 'may be formed to protrude radially of the shaft 4 on the outer circumferential surface of at least one of the small diameter portion 4A and the large diameter portion 4B. The shaft impeller 60 'can be formed in the side surface 4D of the outer peripheral surface 4C and the side surface 4D of the large diameter part 4B. The shaft impeller 60 'can be formed in the side surface 4D of the large diameter part 4B and the outer peripheral surface of the small diameter part 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 may be injected into the impeller 60 formed in the rotor 3 to rotate the rotor. After cooling (3), it can be spread around 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) opened to inject oil toward the shaft impeller (60 ') provided on the outer circumferential 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 into 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.

The present embodiment may be formed with a shaft groove 46 for scattering oil droplets on the outer circumferential surface of the shaft 4, the other configuration and operation other than the shaft groove 46 is an embodiment of the present invention or another embodiment Are the same as or similar to, and the same reference numerals are used, and detailed description thereof will be omitted.

The present embodiment may include an oil injection pipe 5 for injecting oil into the motor, and some of the oil injected from the oil injection pipe 5 may flow along the outer surface of the shaft 4, and the shaft It may be scattered around by the grooves 46. The oil thus scattered may flow into the stator 2, the rotor 3, and the motor covers 12 and 13.

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 (13)

A housing assembly having a space formed therein; A stator disposed in the space; A rotor rotatably positioned within the stator; A shaft on which the rotor is mounted; An oil injection pipe mounted to the housing assembly and spaced apart from the rotor, The oil injection pipe An oil channel through which the oil passes; And at least one rotor cooling hole for injecting oil from the oil channel toward the outer surface of the rotor. The method of claim 1, The rotor includes a pair of end plates spaced in the longitudinal direction of the shaft, An impeller protrudes from an outer surface of at least one of the pair of end plates, The rotor cooling hole is a motor open in the direction of injecting oil toward the impeller. The method of claim 2, The impeller includes a plurality of blades whose leading edge is closer to the shaft than the trailing edge, The rotor cooling hole is open toward the region where the leading edge of the impeller is located. The method of claim 2, The stator includes a stator core surrounding the outer circumference of the rotor and a stator coil mounted to the stator core. The stator coil is 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 and the radial direction of the shaft. The method of claim 2, The housing assembly A motor housing having a space formed therein; A motor cover covering a space of the motor housing; The impeller protrudes toward the motor cover on a surface of the both sides of the end plater toward the motor cover. The method of claim 5, wherein The impeller includes a plurality of blades protruding on the outer surface and the outer diameter is reduced closer to the motor cover and the oil guide for guiding oil in the centrifugal direction. The method of claim 5, wherein At least one oil inlet protruding outward from the top of the motor housing; And an oil outlet mounted to the outside of the motor housing to protrude outward. The oil injection pipe is connected to the oil inlet and disposed in the horizontal direction long inside the housing. The method of claim 1, The rotor cooling hole is formed in plural in the oil injection pipe, The space between the plurality of rotor cooling holes is smaller than the outer diameter of the rotor. The method of claim 1, The motor is provided with a stator cooling hole for injecting oil toward the stator in the oil injection pipe. The method of claim 1, The housing assembly A motor housing having a space formed therein; A motor cover covering a space of the motor housing and mounted with a bearing supporting the shaft; And a motor cover cooling hole in the oil spray pipe, the motor cooling hole being different from the rotor cooling hole in an opening direction and spraying oil toward the motor cover. The method of claim 1, The housing assembly A motor housing having a space formed therein; A motor cover covering a space of the motor housing and mounted with a bearing supporting the shaft; The motor cover further includes a bearing housing portion surrounding the outer circumference of the bearing, The bearing housing portion is formed with at least one oil hole for guiding oil to the periphery of the bearing, And an oil chamber portion in which the oil hole communicates with and collects oil on the bearing housing portion. The method of claim 1, And a shaft impeller having a plurality of blades for scattering oil on the outer circumference of the shaft. The method of claim 1, A motor having a shaft groove formed on the outer circumference of the shaft to scatter oil.

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