KR20220090745A - Motor with improved lubrication of bearing - Google Patents

Abstract

The present invention is a housing having an inner space; lubricating oil accommodated in the inner space of the housing; a stator disposed on the inner circumferential surface of the housing and having a coil wound thereon; a rotor rotated by the electromagnetic field generated by the coil; a shaft disposed at the center of the rotor and rotating together with the rotor; a bearing portion including an inner ring coupled to the shaft, an outer ring coupled to the housing, and rolling members provided to be rotatably rolled between each race of the inner ring and the outer ring; an impeller unit coupled to the shaft, generating a flow of air when the shaft rotates, and providing the lubricant to the bearing unit; Disclosed is a motor with improved lubrication of bearings comprising a.

Description

Motor with improved lubrication of bearings

The present invention relates to a motor with improved bearing lubrication.

In the conventional induction motor, when a specific frequency is input to a stator coil in which a stator core is stacked and the coil is wound, an induced current is generated on the rotor side where the core is stacked and aluminum die-casting, and the rotor rotates. has a structure that

Such an induction motor has a problem that high heat is always generated in the rotor due to the induced current of the rotor.

In other words, by making a heat dissipation fin on the rotor to move the heat inside the rotor to the inner wall of the housing through air, and attaching a fan to the back of the shaft, the heat generated from the rotor rotates to quickly move the heat from the outer wall of the housing to the atmosphere for heat dissipation. did

However, in the conventional structure, the size of the motor had to be made large, and heat dissipation by the heat dissipation fins of the rotor was limited, so there was a problem that the output of the motor could not be increased to the maximum.

The motor with improved bearing lubrication according to an embodiment of the present invention has been proposed to solve the above problems, and continuously lubricates the bearing, and can cool the motor and the bearing.

On the other hand, the technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned are clearly to those of ordinary skill in the art to which the present invention belongs from the description below. can be understood

A motor with improved bearing lubrication according to an embodiment of the present invention includes: a housing having an inner space; lubricating oil accommodated in the inner space of the housing; a stator disposed on the inner circumferential surface of the housing and having a coil wound thereon; a rotor rotated by the electromagnetic field generated by the coil; a shaft disposed at the center of the rotor and rotating together with the rotor; a bearing portion including an inner ring coupled to the shaft, an outer ring coupled to the housing, and rolling members provided to be rotatably rolled between each race of the inner ring and the outer ring; an impeller unit coupled to the shaft, generating a flow of air when the shaft rotates, and providing the lubricant to the bearing unit; may include.

The bearing unit may be disposed on both sides of the housing, and the impeller unit may include a first impeller coupled to one side of the shaft and a second impeller coupled to the other side of the shaft.

The first impeller and the second impeller may generate a flow of air in the same direction.

The first impeller and the second impeller may generate air flow in mutually opposite directions.

The lubricating oil may be accommodated in a lower space in the inner space of the housing, and the housing may include a channel block to which the outer ring is coupled, and a lubricant channel having a front end communicating with the lower space and a rear end facing the bearing part.

A side of the channel block facing the rotor may have an inclined surface.

The housing may further include an exhaust hole communicating with the outside and the inside space.

It may further include a filter disposed in the exhaust hole.

It may further include a filter disposed in the lubricant channel.

The motor with improved bearing lubrication according to an embodiment of the present invention has the effect of continuously lubricating the bearing and cooling the motor and the bearing.

On the other hand, the effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those of ordinary skill in the art to which the present invention belongs from the description below. will be able

1 is a cross-sectional view schematically showing a motor according to a first embodiment of the present invention,
FIG. 2 is an enlarged view of an area “2” of FIG. 1 .
3 is a cross-sectional view schematically showing a motor according to a second embodiment of the present invention;
4 is a cross-sectional view schematically showing a motor according to a third embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be described in more detail with reference to the accompanying drawings. Embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be construed as being limited to the following embodiments. This embodiment is provided to more completely explain the present invention to those of ordinary skill in the art. Accordingly, the shapes of elements in the drawings are exaggerated to emphasize a clearer description.

The configuration of the invention for clarifying the solution to the problem to be solved by the present invention will be described in detail with reference to the accompanying drawings based on a preferred embodiment of the present invention, but the same in assigning reference numbers to the components of the drawings For the components, even if they are on different drawings, the same reference numbers are given, and it is noted in advance that the components of other drawings can be cited when necessary in the description of the drawings.

1 is a cross-sectional view schematically showing a motor according to a first embodiment of the present invention, and FIG. 2 is an enlarged view of area “2” of FIG. 1 .

1 and 2 , the motor 100 with improved bearing lubrication according to the first embodiment of the present invention includes a housing 110 , a stator 120 , a rotor 130 , a shaft 140 , and a bearing. It may include a part 150 and an impeller 160 .

Here, the motor 100 may be formed in various ways other than the illustrated drawings, and may be provided as an electric power driving source for an eco-friendly vehicle such as a pure electric vehicle or a fuel cell vehicle.

Furthermore, the motor 1 applicable to the embodiment of the present invention may be provided as an electric power driving source of a hybrid eco-friendly vehicle (eg, HEV or PHEV) using the driving force and electric power of the engine.

The motor 100 applied to the embodiment of the present invention may include, for example, a permanent magnet synchronous motor (PMSM), and a Wound Rotor Synchronous Motor (WRSM). may include

However, it should not be understood that the protection scope of the present invention is limitedly applied to the motor of an eco-friendly electric power driving vehicle, and the technical idea of the present invention may be applied as long as it is a motor used in various industrial fields.

The motor 100 as described above includes a stator 120 fixed to the inside of the housing 110, a rotor 130 disposed with a predetermined gap with the stator 120 and rotating about a shaft 130 as a drive shaft. contains The motor 100 may be applied to, for example, an internal type synchronous motor in which the rotor 130 is disposed inside the stator 120 .

Here, the stator 120 has a coil 121 wound thereon, and the shaft 130 is rotatably coupled to the housing 110 through the bearing part 150 according to an embodiment of the present invention.

The bearing part 150 is installed in a sliding manner to the shaft 130 and is installed in a fitting manner to the housing 110 .

Specifically, the housing 110 may include an inner space 111 and a channel block 112 disposed on both sides in the lower portion of the inner space 111 and forming a lubricant channel 113 .

Here, in the lower portion of the inner space 111 , the lubricant 10 enough to contain at least one stator 120 may be accommodated, and the lubricant channel 113 is formed between the lower space of the inner space 111 and the bearing part 150 . ) can be connected.

Meanwhile, referring to FIG. 2 , at least one venturi tube 113a may be disposed in the lubricant channel 113 .

The lubricant 10 stored in the lower space of the inner space 111 can be more efficiently transferred by the pressure difference of the oil flowing inside the venturi tube 113a connected to the bearing unit 150 .

Here, although the venturi region 2 is illustrated as being formed only on the left side of the lubricant channel 113 in FIG. 1 , it may be formed on both sides of the lubricant channel 113 .

In addition, although not shown, it is preferable that the venturi tube is also formed in each of the lubricant channels 113 shown in FIGS. 3 and 4 .

On the other hand, of course, the housing 110 can open and close the inner space 111 through a cover formed on one side and/or the other side.

The stator 120 is mounted along the inner circumferential surface of the housing 110 , and a core wound with a coil 121 may be coupled thereto.

The rotor 130 is rotated by the electromagnetic field generated by the coil 121 , and the shaft 140 may be coupled to the center.

The bearing part 150 may be disposed at both ends of the shaft 140 to position and fix the shaft 140 inside the housing 110 .

The bearing unit 150 may include an inner ring coupled to the shaft 140 , an outer ring coupled to the housing 110 , and rolling members provided to be rotatably rolling between each race of the inner ring and the outer ring.

Here, the outer ring may be coupled to the channel block 112 of the housing 110 .

The impeller unit 160 may be coupled to the shaft 140 to forcibly generate a flow of air or fluid in the inner space 111 of the housing 110 .

The impeller unit 160 includes a first impeller 161 disposed on one side of the rotor 130 on the shaft 140 and a second impeller 162 disposed on the other side of the rotor 130 on the shaft 140 . may include

Here, the pair of the first impeller 161 and the second impeller 162 are preferably disposed symmetrically on both sides with respect to the center of the rotor 130 .

Meanwhile, in the motor 100 according to the first embodiment of the present invention, the first impeller 161 and the second impeller 162 may generate a flow of air or fluid in the same direction.

For example, both the first impeller 161 and the second impeller 162 may generate a flow in one direction (right direction in FIG. 1 ) or in the other direction (left direction in FIG. 1 ).

Specifically, when the shaft 140 rotates by the operation of the motor 100 , the first impeller 161 and the second impeller 162 fixed to the shaft 140 rotate together, and the inner space 111 . can create a flow of air in a given direction.

In this case, the lubricant 10 accommodated in the lower portion of the inner space 111 may be provided to the bearing unit 150 side through the channel 113 according to the flow of air.

Thereafter, the surplus lubricating flow 10 provided to the bearing unit 150 and remaining may be received again in the lower space of the inner space 111 along the inner surface of the channel block 112 by its own weight, and this circulation process Through the lubricating oil can flow in a predetermined direction in the inner space (111).

Through the above-described process, the motor 100 according to the first embodiment of the present invention may continuously lubricate the bearing and cool the motor and the bearing.

3 is a cross-sectional view schematically showing a motor according to a second embodiment of the present invention.

Referring to FIG. 3 , the motor 200 with improved bearing lubrication according to the second embodiment of the present invention includes a housing 210 , a stator 120 , a rotor 130 , a shaft 140 , and a bearing unit 150 . ), filters 220 and 230 and an impeller 260 may be included.

Meanwhile, in the motor 200 according to the second embodiment of the present invention, the structures of the housing 210 and the impeller 260 are different from those of the motor 100 of FIG. 1 , and hereinafter, the housing 210 and the impeller are differentiated. 260 will be described in detail, and the same components as those of FIG. 1 have the same reference numerals, and detailed descriptions thereof will be omitted below.

Specifically, the housing 210 may include an inner space 111 and a channel block 112 disposed on both sides in the lower portion of the inner space 111 and forming a lubricant channel 113 .

Here, at least one stator 120 may be accommodated in a lower portion of the inner space 111 , lubricating oil may be accommodated, and the lubricant channel 113 may connect the lower space of the inner space 111 and the housing 150 . have.

On the other hand, of course, the housing 210 can open and close the inner space 111 through a cover formed on one side and/or the other side.

Meanwhile, the housing 210 may further include an exhaust hole 211 formed at an upper end thereof.

The filters 220 and 230 may include a first filter 220 and a second filter 230 .

The first filter 220 may be disposed in the exhaust hole 211 to maintain the dustproof performance of the inner space 111 of the housing 210 .

The impeller 260 may be coupled to the shaft 140 to forcibly generate a flow of air or fluid in the inner space 111 of the housing 210 .

The impeller unit 260 includes a first impeller 261 disposed on one side of the rotor 130 from the shaft 140 and a second impeller 262 disposed on the other side of the rotor 130 from the shaft 140 . may include

Here, it is preferable that the pair of first impeller 261 and second impeller 262 are symmetrically disposed on both sides with respect to the center of the rotor 130 .

Meanwhile, in the motor 200 according to the second embodiment of the present invention, the first impeller 261 and the second impeller 262 may generate a flow of air or fluid in the same direction different from each other.

For example, the first impeller 261 generates a flow in one direction and the second impeller 262 generates a flow in the other direction, or the first impeller 261 generates a flow in the other direction and the second impeller 262 ) can create a flow in one direction.

Specifically, when the shaft 140 rotates by the operation of the motor 200 , the first impeller 261 and the second impeller 262 fixed to the shaft 140 rotate together, and the inner space 111 . can create a flow of air in a given direction.

In this case, the lubricant 10 accommodated in the lower portion of the inner space 111 may be provided to the bearing unit 150 side through the channel 113 according to the flow of air.

Thereafter, the surplus lubricant 10 provided to the bearing unit 150 and remaining may be accommodated again in the lower space of the inner space 111 along the inner surface of the channel block 112 by its own weight, and this circulation process Through this, the lubricant 10 may flow in a predetermined direction in the internal space 111 .

On the other hand, the air is collected toward the center side of the inner space 111 by the pair of impellers 261 and 262 and the pressure of the inner space 111 can be increased, thereby solving the problem of increasing the pressure through the exhaust hole 211 . can be solved

Meanwhile, the second filter 230 may be disposed in the lubricant channel 113 to remove foreign substances present in the lubricant oil that has passed through the bearing unit 140 .

Through the above-described process, the motor 200 according to the second embodiment of the present invention may continuously lubricate the bearing and cool the motor and the bearing.

4 is a cross-sectional view schematically showing a motor according to a third embodiment of the present invention.

Referring to FIG. 4 , the motor 300 with improved bearing lubrication according to the third embodiment of the present invention includes a housing 310 , a stator 120 , a rotor 130 , a shaft 140 , and a bearing unit 150 . ) and the impeller 160 may be included.

On the other hand, the motor 300 according to the third embodiment of the present invention has a different structure of the housing 310 compared to the motor 100 of FIG. 1 , and the differentiated housing 310 will be described in detail below, The same components as those of FIG. 1 have the same reference numerals, and detailed descriptions thereof will be omitted below.

Specifically, the housing 310 may include an inner space 111 and a channel block 312 that is disposed on both sides in the lower portion of the inner space 111 and forms a lubricant channel 313 .

Here, at least one stator 120 may be accommodated in a lower portion of the inner space 111 , and a lubricant oil channel 313 may connect the lower space of the inner space 111 and the housing 150 . have.

On the other hand, of course, the housing 310 can open and close the inner space 111 through a cover formed on one side and/or the other side.

The channel block 312 of the housing 310 may have an inner surface 314 facing the center of the housing 310 inclined.

That is, the inner surface 314 of the channel block 312 has an inclination, and the inner surface toward the rotor 130 forms an inclined surface, so that the lubricant 10 passing through the bearing unit 150 is easily moved downward along the inclined surface. can be transported In addition, the lubricating oil 10 provided to the bearing part 150 can be easily transferred along the inclined surface.

Through this, the lubricating oil 10 provided to the bearing unit 150 or the lubricating oil 10 passing through the bearing unit 150 may be more easily transferred.

Through the above-described process, the motor 300 according to the second embodiment of the present invention may continuously lubricate the bearing and cool the motor and the bearing.

The above detailed description is illustrative of the present invention. In addition, the above description shows and describes preferred embodiments of the present invention, and the present invention can be used in various other combinations, modifications, and environments. That is, changes or modifications are possible within the scope of the concept of the invention disclosed herein, the scope equivalent to the written disclosure, and/or within the scope of skill or knowledge in the art. The written embodiment describes the best state for implementing the technical idea of the present invention, and various changes required in specific application fields and uses of the present invention are possible. Accordingly, the detailed description of the present invention is not intended to limit the present invention to the disclosed embodiments. Also, the appended claims should be construed to include other embodiments.

10: lubricant
100, 200, 300: motor
110: housing
111: internal space
112: channel block
113: channel
120: stator
121: coil
130: rotor
140: shaft
150: bearing part
160: impeller
161: first impeller
162: second impeller

Claims (9)

a housing having an inner space;
lubricating oil accommodated in the inner space of the housing;
a stator disposed on the inner circumferential surface of the housing and having a coil wound thereon;
a rotor rotated by the electromagnetic field generated by the coil;
a shaft disposed at the center of the rotor and rotating together with the rotor;
a bearing portion including an inner ring coupled to the shaft, an outer ring coupled to the housing, and rolling members provided to be rotatably rolled between each race of the inner ring and the outer ring;
an impeller coupled to the shaft, generating a flow of air when the shaft rotates, and providing the lubricating oil to the bearing part; A motor with improved lubrication of bearings, including
The method of claim 1,
The bearing parts are respectively disposed on both sides of the housing,
The motor with improved lubrication of the bearing comprising the impeller part a first impeller coupled to one side of the shaft and a second impeller coupled to the other side of the shaft.
3. The method of claim 2,
The motor with improved lubrication of bearings for generating air flow in the same direction as the first impeller and the second impeller.
3. The method of claim 2,
The first impeller and the second impeller are motors with improved lubrication of bearings for generating air flow in mutually opposite directions.
3. The method of claim 2,
The lubricating oil is accommodated in the lower space in the inner space of the housing,
The housing includes a channel block to which the outer ring is coupled, and a lubricating oil channel having a front end communicating with the lower space and a rear end facing the bearing part.
6. The method of claim 5,
A motor with improved lubrication of a bearing having an inclined surface on a side of the channel block facing the rotor.
5. The method of claim 4,
The motor housing has improved lubrication of bearings further comprising an exhaust hole communicating with the outside and the inside space.
8. The method of claim 7,
The motor with improved lubrication of bearings further comprising a filter disposed in the exhaust hole.
6. The method of claim 5,
The motor with improved lubrication of bearings further comprising a filter disposed in the lubricant channel.

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