CN113595310A - Rotor subassembly and have its motor - Google Patents
Rotor subassembly and have its motor Download PDFInfo
- Publication number
- CN113595310A CN113595310A CN202110892346.7A CN202110892346A CN113595310A CN 113595310 A CN113595310 A CN 113595310A CN 202110892346 A CN202110892346 A CN 202110892346A CN 113595310 A CN113595310 A CN 113595310A
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- Prior art keywords
- oil
- guide
- passage
- bearing
- bearing portion
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- 239000003921 oil Substances 0.000 claims description 199
- 239000010687 lubricating oil Substances 0.000 claims description 45
- 238000012546 transfer Methods 0.000 claims description 5
- 239000010724 circulating oil Substances 0.000 claims description 4
- 230000001133 acceleration Effects 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 239000004519 grease Substances 0.000 description 18
- 230000005540 biological transmission Effects 0.000 description 7
- 230000002093 peripheral effect Effects 0.000 description 7
- 239000000314 lubricant Substances 0.000 description 5
- 230000001050 lubricating effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
- H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
- H02K5/1732—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings radially supporting the rotary shaft at both ends of the rotor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C37/00—Cooling of bearings
- F16C37/007—Cooling of bearings of rolling bearings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/08—Structural association with bearings
- H02K7/083—Structural association with bearings radially supporting the rotary shaft at both ends of the rotor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
Abstract
The application provides a rotor assembly and a motor with the same, wherein the rotor assembly comprises a rotating shaft, a first bearing part, a second bearing part and an oil way, wherein the first bearing part and the second bearing part are arranged on the rotating shaft; the oil path is used for transferring heat generated by the first bearing part and/or the second bearing part to the rotating shaft between the first bearing part and the second bearing part. According to the rotor assembly and the motor with the same, heat on the bearing can be prevented from being transferred to the end part of the rotating shaft.
Description
Technical Field
The application belongs to the technical field of motors, and particularly relates to a rotor assembly and a motor with the same.
Background
At present, when a feeding servo motor for a machine tool works at present, friction loss caused by high-speed rotation of front and rear bearings of the feeding servo motor is often transmitted to an encoder end and a shaft extension end simultaneously in a heat mode: when heat is transferred to the encoder, the precision of the encoder is reduced along with the rise of temperature, and even the electrical elements of the encoder are irreversibly damaged when the temperature rise seriously exceeds the standard, so that the processing precision of a machine tool feeding servo system is directly influenced; and when the heat of the bearing is transferred to the shaft extension end of the motor, the reverse back clearance of the transmission structure is increased along with the increase of the temperature, so that the processing precision is reduced. The continuous rise of the temperature can also cause the volatilization of grease of the bearing, the lubrication reduces the abrasion rise, the problem is more serious, and a dead cycle is formed. The performance of the motor is affected when heat on the bearings is transferred to the end of the rotating shaft.
Therefore, how to provide a rotor assembly capable of preventing heat on a bearing from being transferred to an end of a rotating shaft and a motor having the same become a problem to be solved by those skilled in the art.
Disclosure of Invention
Therefore, an object of the present invention is to provide a rotor assembly and a motor having the same, which can prevent heat on a bearing from being transferred to an end of a rotating shaft.
In order to solve the above problems, the present application provides a rotor assembly including:
a rotating shaft;
the first bearing part and the second bearing part are both arranged on the rotating shaft;
and the oil path is arranged on the rotating shaft, and lubricating oil can flow in the oil path to transfer heat generated by the first bearing part and/or the second bearing part to the rotating shaft between the first bearing part and the second bearing part.
Further, the oil passage is a circulating oil passage communicating the first bearing portion and the second bearing portion.
Further, the oil passage has a guide portion for guiding the flow of the lubricating oil in the oil passage.
Further, the guide portion includes a guide passage extending in an axial direction of the rotary shaft; the cross section of the guide passage gradually increases in the flow direction of the lubricating oil.
Further, the guide part also comprises a guide thread, and the guide channel is provided with a guide surface; on the longitudinal section of the rotating shaft, the guide surface is obliquely arranged relative to the extending direction of the rotating shaft, so that the cross section of the guide channel is gradually increased in the flowing direction of the lubricating oil; the guide screw thread is arranged on the guide surface.
Further, the oil path includes a first oil outlet hole; the first oil outlet hole is formed in the inner ring of the first bearing portion, and the position of the first oil outlet hole corresponds to the position of the ball of the first bearing portion.
Further, the oil passage includes an oil inlet passage extending from the first bearing portion to the second bearing portion, through which the lubricating oil can flow from the first bearing portion toward the second bearing portion.
Furthermore, the oil path further comprises an oil return path, the oil return path extends from the second bearing part to the first bearing part, and the lubricating oil can flow from the second bearing part to the first bearing part through the oil return path.
Further, when the oil path has a guide portion including a guide passage and a guide screw, and the oil path includes an oil inlet path, the oil inlet path includes a first guide section forming a first guide passage, and an inner wall of the first guide passage forms an included angle a on a longitudinal section of the rotary shaft, wherein,
n is the rotation speed of the rotor assembly; r is the oil path radius.
Further, when the oil path has a guide portion including a guide passage and a guide screw, an inner wall of the guide passage includes a guide surface, and the oil path includes an oil return path and an oil inlet path,the oil return path comprises a second guide section, and a second guide channel is formed by the second guide section; the inner wall of the second guide channel comprises a second guide surface which is obliquely arranged relative to the extending direction of the rotating shaft, the angle of inclination of the second guide surface relative to the extending direction of the rotating shaft is b,
n is the rotation speed of the rotor assembly; m is the total mass of the lubricating oil in the oil way; g is the acceleration of gravity; r is the cross-sectional radius of the oil inlet path.
Further, the thread inclination angle of the guide thread is greater than or equal to the inclination angle of the second lead surface with respect to the extending direction of the rotating shaft.
Furthermore, an oil amount detector is arranged on the first bearing part and used for detecting the amount of lubricating oil in the first bearing part.
According to yet another aspect of the present application, there is provided an electric machine comprising a rotor assembly as described above.
The application provides a rotor subassembly and have its motor, through the oil circuit with the heat transfer that first bearing portion and/or second bearing portion produced to the pivot between the two on, can prevent the heat on the bearing to the tip of pivot transmission.
Drawings
FIG. 1 is a cross-sectional view of a rotor assembly according to an embodiment of the present application;
FIG. 2 is a schematic structural view of a rotor assembly according to an embodiment of the present application;
fig. 3 is a cross-sectional view of a motor according to an embodiment of the present application.
The reference numerals are represented as:
1. a rotating shaft; 2. a first bearing portion; 21. a first oil outlet hole; 22. an oil level monitoring hole; 23. an oil return hole; 3. a second bearing portion; 31. an oil inlet hole; 32. a second oil outlet hole; 4. an oil path; 41. an oil inlet path; 411. a first guide channel; 412. a first guide surface; 42. an oil return path; 421. a second guide channel; 422. a second guide surface; 5. a guide thread; 6. an oil amount detector.
Detailed Description
Referring collectively to fig. 1-3, a rotor assembly comprising: the oil pump comprises a rotating shaft 1, a first bearing part 2, a second bearing part 3 and an oil way 4, wherein the first bearing part 2 and the second bearing part 3 are arranged on the rotating shaft 1; the oil passage 4 is used for transferring heat generated by the first bearing part 2 and/or the second bearing part 3 to the rotating shaft 1 between the first bearing part 2 and the second bearing part 3, and the heat generated by the first bearing part 2 and/or the second bearing part 3 is dispersed through the continuous flow of grease in the oil passage 4; the heat on the bearing can be prevented from being transferred to the end of the rotating shaft 1. The first bearing part 2 is a rear bearing; the second bearing part 3 is a front bearing, and when the oil path 4 transfers the heat generated by the first bearing part 2 to the rotating shaft 1 between the first bearing part 2 and the second bearing part 3, the problem that the absolute accuracy of the encoder is influenced by the heat transferred to the encoder part under the influence of the friction loss of the rear bearing can be solved. When the oil path 4 transfers the heat generated by the second bearing part 3 to the rotating shaft 1 between the first bearing part 2 and the second bearing part 3, the problem that the transmission precision of the system is influenced due to the fact that the reverse back clearance is increased as the heat generated by the second bearing part 3 is transferred to the shaft extension part under the influence of the friction loss of the front bearing and the heat is conducted to the transmission structure connected with the shaft extension part is solved. In the rotor assembly, the actual heat sources are the first bearing part 2 and the second bearing part 3, and the balls rub in the bearings during rotation to generate friction loss and heat, so that the uneven heat generation causes the deformation of the rotating shaft 1, and the loss increase and the ineffective power increase, thereby reducing the motor efficiency. This application reduces the friction loss and evenly transmits the heat to the axle body simultaneously through lubricating oil at lubricated bearing, reduces the local heat in the pivot 1 for the more even distribution of heat can also prevent that pivot 1 from warping in pivot 1.
The application also discloses some embodiments, and the oil path 4 is a circulating oil path 4 for communicating the first bearing part 2 and the second bearing part 3. After the first bearing part 2 is lubricated, the lubricating oil enters the oil path 4 and then enters the second bearing part 3 to play a lubricating role, and then returns to the first bearing part 2 to circularly flow, so that the heat generated by the first bearing part 2 and/or the second bearing part 3 can be uniformly transferred to the rotating shaft 1 between the first bearing part 2 and the second bearing part 3, the lubricating oil quantity of the first bearing part 2 and the second bearing part 3 can be ensured in real time, the first bearing part 2 and the second bearing part 3 are fully lubricated, and the friction loss of the first bearing part 2 and the second bearing part 3 is reduced; the problem of first bearing portion 2 and second bearing portion 3 can lead to the volatilization of inside grease under long-term operation is solved for friction loss constantly risees, causes the influence that receives the friction loss of bearing of traditional servo motor, can appear bearing grease volatilize and lead to the loss increase, the bearing life-span reduces is also prevented because first bearing portion 2 and the 3 friction losses of second bearing portion lead to generate heat more seriously, more to the problem of the transmission of 1 tip of pivot. The working environment of the motor can be effectively improved, the precision of a machine tool feeding system and the service life of a motor bearing are effectively guaranteed, and the running reliability of the motor and the machining precision of a machine tool are better guaranteed.
The application also discloses some embodiments, the oil path 4 has a guiding portion, the guiding portion is used for guiding the lubricating oil to flow in the oil path 4, when the oil path 4 is a circulating oil path 4, the guiding portion can guide the lubricating oil to flow from the first bearing portion 2 to the second bearing portion 3, and then the lubricating oil is left to flow to the first bearing portion 2 from the second bearing portion 3 to form a circulating flow. At 1 internal design of pivot and bearing complex lubricated oil circuit 4, through the heat that the grease constantly flows consumption friction loss produced in the bearing in the oil circuit 4, reduce the bearing in the grease volatilize, prolong the life of bearing better, temperature when simultaneously through the control bearing operation indirectly reduces the temperature rise of encoder portion and axle extension, guarantees encoder precision and transmission precision, has effectively guaranteed the precision of lathe feed system, and then guarantees the machining precision of lathe better.
The application also discloses some embodiments, the guiding part comprises a guiding channel, and the guiding channel extends along the axial direction of the rotating shaft 1; the cross section of the guide passage gradually increases in the flow direction of the lubricating oil. That is, the centrifugal force of the lubricant in the guide passage becomes larger and larger in the flow direction of the lubricant, and an attractive force is generated to cause the lubricant to flow into the guide passage.
The application also discloses embodiments where the guide further comprises a guide thread 5, the guide channel having a guide surface; on the longitudinal section of the rotating shaft 1, a guide surface is obliquely arranged relative to the extending direction of the rotating shaft 1, so that the cross section of a guide channel in the flowing direction of the lubricating oil is gradually increased; the guide thread 5 is arranged on the guide surface. The lubricating oil can rotate and flow along the spiral structure of the threads, so that the lubricating oil can be guided.
The application also discloses some embodiments, the oil path 4 comprises a first oil outlet hole 21; the first oil outlet 21 is arranged on the inner ring of the first bearing part 2; the position of the first oil outlet hole 21 corresponds to the position of the balls of the first bearing portion 2, and when the rotating shaft 1 rotates, the balls approach to a position close to the outer ring of the first bearing portion 2 by the centrifugal force, so that the lubricating oil in the first bearing portion 2 flows out of the first oil outlet hole 21.
The application also discloses some embodiments, the oil path 4 includes an oil inlet path 41, the oil inlet path 41 extends from the first bearing portion 2 to the second bearing portion 3, and the lubricating oil can flow from the first bearing portion 2 to the second bearing portion 3 through the oil inlet path 41. The first oil outlet 21 belongs to an oil inlet 41, and the oil inlet 41 is arranged inside the rotating shaft 1. The oil inlet 41 further comprises an oil inlet hole 31, and the first oil outlet hole 21 is arranged on the first bearing part 2 and is located on the inner ring of the first bearing part 2 for guiding the lubricating oil in the first bearing part 2 to flow out; the oil inlet 31 is disposed on the second bearing portion 3 and located on the inner ring of the second bearing portion 3 for guiding the lubricant in the oil inlet 41 to flow into the second bearing portion 3, so as to complete the process of the lubricant flowing from the first bearing portion 2 to the second bearing portion 3.
The application also discloses some embodiments, and oil circuit 4 still includes oil return way 42, and oil return way 42 extends to first bearing portion 2 from second bearing portion 3, and lubricating oil can flow to first bearing portion 2 from second bearing portion 3 through oil return way 42. The oil return path 42 is arranged inside the rotating shaft 1 and located on the outer peripheral side of the oil inlet path 41, the oil return path 42 includes a second oil outlet hole 32 and an oil return hole 23, the second oil outlet hole 32 is arranged on the second bearing portion 3 and is opened on the inner ring of the second bearing portion 3; the oil return hole 23 is disposed on the first bearing portion 2 and opened on the inner ring of the first bearing portion 2, the oil inlet end of the oil return path 42 is the second oil inlet hole 31 for guiding the lubricating oil in the second bearing portion 3 to flow out, and the oil outlet end of the oil return path 42 is the oil return hole 23 for guiding the lubricating oil in the oil return path 42 to flow into the first bearing portion 2 to form an oil return process from the second bearing to the first bearing.
The present application also discloses embodiments in which, when the oil path 4 has a guide portion including a guide passage and a guide thread 5, and the oil path 4 includes the oil inlet path 41, the oil inlet path 41 includes a first guide section forming a first guide passage 411, and an inner wall of the first guide passage 411 forms an included angle a on a longitudinal section of the rotation shaft 1, wherein,
n is the rotation speed of the rotor assembly; r is the radius of the oil passage 4. The oil guiding effect can be achieved no matter what the screwing direction of the guiding thread is.
The oil inlet 41 comprises a first oil outlet 21, a first radial channel, an axial channel, a second radial channel and an oil inlet 31 which are communicated in sequence; first radial passageway, axial passage and second radial passageway all set up in pivot 1 inside, first radial passageway and second radial passageway all along pivot 1 radial extension, and the quantity of first radial passageway and second radial passageway is at least one separately, the oil inlet end of first oil outlet 21 of first radial passageway intercommunication and axial passageway, the oil outlet end intercommunication second radial passageway of axial passageway, the oil inlet 31 that the second radial passageway intercommunication set up in the 3 inner circles of second bearing portion. The first guide passage 411 is arranged on the axial passage to form a first guide passage 411, the first guide passage 411 is positioned inside the rotating shaft 1 and is a tapered passage, namely, in the flowing direction of the lubricating oil, the cross-sectional area of the first guide passage 411 is gradually increased, namely, the first end of the first guide passage 411 with smaller diameter is close to the first bearing part 2; the inner wall of the first guide passage 411 is a tapered surface to form a first guide surface 412, and the first guide surface 412 is provided with a guide thread 5.
When the rotor rotates, the roller of the first bearing portion 2 moves to a position far away from the center of the rotating shaft 1 under the action of centrifugal force to expose the first oil outlet 21 arranged on the inner ring of the first bearing portion 2, the lubricating oil in the first bearing portion 2 enters the first radial channel through the first oil outlet 21, when the lubricating oil is larger and larger, the lubricating oil enters the axial channel, and because the cross-sectional area of the first guide channel 411 is larger and larger in the direction far away from the first bearing portion 2, the centrifugal force applied to the lubricating oil in the first guide channel 411 is also larger and larger, the lubricating oil in the axial channel is attracted to enter the first guide channel 411, flows out from the first guide channel 411 to the second radial channel, and then enters the second bearing portion 3 through the oil inlet 31. The number of the first oil outlet holes 21 is set to be at least one, and each oil outlet hole is correspondingly provided with a first radial oil channel.
When the oil path 4 is provided with a guide part, the guide part comprises a guide channel and a guide thread 5, the inner wall of the guide channel comprises a guide surface, and the oil path 4 comprises an oil return path 42 and an oil inlet path 41, the oil return path 42 comprises a second guide section which forms a second guide channel 421; the inner wall of the second guide channel 421 includes a second guide surface 422, the second guide surface 422 is disposed obliquely with respect to the extending direction of the rotation shaft 1, the angle of inclination of the second guide surface 422 with respect to the extending direction of the rotation shaft 1 is b,
n is the rotation speed of the rotor assembly; m is the total mass of the lubricating oil in the oil way 4; g is the acceleration of gravity; r is the cross-sectional radius of the oil inlet passage 41. Namely b is an included angle formed by the extension line of the shaft and the guide surface. The oil inlet path 41 comprises a main path, the main path extends along the axial direction of the rotating shaft 1, and r is the cross section radius of the main path; the first end of the main path is communicated with the second oil outlet hole 32, and the second end of the main path is communicated with the oil return hole 23; the main path is provided with a second guide section to form a second guide channel 421, and the cross-sectional area of the second guide channel 421 is gradually increased in the direction close to the second end of the main path. The second guide channel 421 is an annular channel, and includes an outer peripheral wall and an inner peripheral wall, the extending direction of the outer peripheral wall is consistent with the extending direction of the rotating shaft 1, the inner peripheral wall is close to the direction of the second end of the main path, the inner peripheral wall gradually inclines towards the direction close to the center of the rotating shaft 1 to form a second guide surface 422, and the inner peripheral wall is provided with a guide thread 5. Since the cross-sectional area of the second guide passage 421 is gradually increased in the direction close to the second end of the main path, the centrifugal force in the second guide passage 421 is also gradually increased, and the second bearing portion can be attractedThe lubricating oil in the chamber 3 flows into the second guide passage 421, flows out along the screw rotation, and flows back into the first bearing 2. The number of oil return paths 42 is set to at least one; for example, when the first guide passage 411 is filled with grease/oil, the second guide passage 421 is always filled with grease, and when the grease/oil in the second guide passage 421 moves toward the rear bearing, the moving path formed by the second guide passage 4 gradually increases, and at this time, the centrifugal force applied to the lubricating oil increases, and the effect of sucking the grease/oil to continue flowing can be achieved. Overall, the resultant force becomes larger, the second guide channel 422 channel becomes larger gradually from the front bearing direction to the rear bearing line radial path, the centrifugal force is equivalent to the integral process about the radial path, so that the larger the radial path (space) is, the larger the resultant centrifugal force is generated.
The present application also discloses embodiments in which the thread pitch angle of the guide thread 5 is greater than or equal to the pitch angle of the second conductor plane with respect to the extension direction of the rotation axis 1. The number of threads of the guide thread 5 is not limited. Therefore, the oil guide effect can be better achieved, and the lubricating oil is prevented from flowing backwards.
The application also discloses some embodiments, be provided with oil mass detector 6 on the first bearing portion 2, oil mass detector 6 is used for detecting the lubricated oil mass in the first bearing portion 2. The bearing is provided with a sealing cover, so that the running loss of lubricating oil is not great. Simultaneously this application rotor subassembly structure can supply lubricating oil, only needs to dismantle the encoder subassembly, through the rear bearing first bearing portion 2 inject lubricating grease can promptly. The oil level detection hole 22 is formed in the outer ring of the first bearing portion 2 and located at the upper end of the first bearing portion 2, and since the outer end of the first bearing portion 2 is fixed, the oil amount detector 6 is disposed in the oil level detection hole 22 at the upper end of the first bearing portion 2, and the amount of lubricating oil in the first bearing portion 2 can be accurately detected. The bearing oil level is monitored in real time, lubricating grease can be periodically supplemented according to the oil quantity in the first bearing part 2, the service life of a motor bearing is prolonged, the service life of a motor is prolonged, the precision of a machine tool feeding system is effectively guaranteed, and the machining precision of a machine tool is better guaranteed; this application reduces the heat under the high-speed rotation of bearing constantly at the time of the abundant lubrication of assurance bearing, avoids transmitting heat to encoder portion and shaft extension portion. Meanwhile, an oil level sensor is arranged in an oil level monitoring hole 22 on the rear bearing, and the oil level sensor can be monitored in real time through a controller to periodically supplement oil. Therefore, the friction loss of a motor bearing is reduced, the service life of the bearing is prolonged, the reliability of the motor is improved, and the precision of an encoder and the transmission precision of the motor are further ensured. The oil amount detector 6 may be an oil level sensor.
According to an embodiment of the present application, there is provided an electric machine including a rotor assembly as described above. The motor comprises a rear end cover, an oil level monitoring hole 22 on the rear bearing needs to correspond to an oil level sensor mounting hole on the rear end cover, and oil passages 4 on the bearing need to correspond to oil passages 4 on the rotating shaft 1 one by one in the mounting process.
After the motor rotates, bearing balls of the first bearing part 2 move in a direction deviating from the rotating shaft 1 under the action of centrifugal force, lubricating grease in the bearing is extruded into an oil outlet channel of the rear bearing and simultaneously enters an oil inlet channel of the main oil way 4 under the action of heat of friction loss of the rear bearing, the centrifugal force component force is greater than the friction force of the grease under the action of the guide thread 5 and the inclination angle of the main oil way 4, the grease is pushed to the front bearing along the rotating shaft 1 and enters a secondary oil way of the rotating shaft through pressure after reaching the plane end of the main oil way 4; the auxiliary oil path refers to an oil path between the main oil path 4 and the front bearing, and the grease is circulated in the main oil path 4 by pressure. The oil return path of the rear bearing enters the main oil path by pressure; at the moment, the force for pushing the grease into the main oil way is equal to the pressure of the auxiliary oil way-centrifugal force, the front bearing oil way enters the auxiliary oil way by virtue of the pressure, and the force for pushing the grease into the auxiliary oil way is equal to the pressure of the main oil way + centrifugal force. Then the oil is shunted into the front bearing under the action of centrifugal force, and enters the upper oil return path 42 and the lower oil return path 42 respectively under the actions of ball extrusion of the front bearing and friction loss of the front bearing. Under the action of the guide threads 5 and the inclination angles of the oil return paths 42, the oil is accelerated and pushed to move back to the rear bearing in the upper oil return path 42 and the lower oil return path 42. Thereby realizing the operation of the entire oil passage 4.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.
Claims (13)
1. A rotor assembly, comprising:
a rotating shaft (1);
the bearing comprises a first bearing part (2) and a second bearing part (3), wherein the first bearing part (2) and the second bearing part (3) are arranged on the rotating shaft (1);
an oil passage (4), the oil passage (4) being provided on the rotating shaft (1), lubricating oil being able to flow within the oil passage (4) to transfer heat generated by the first bearing portion (2) and/or the second bearing portion (3) to the rotating shaft (1) between the first bearing portion (2) and the second bearing portion (3).
2. The rotor assembly according to claim 1, wherein the oil passage (4) is a circulating oil passage (4) communicating the first bearing portion (2) and the second bearing portion (3).
3. The rotor assembly according to claim 1, wherein the oil channel (4) has a guide portion for guiding a flow of lubricating oil within the oil channel (4).
4. A rotor assembly according to claim 3, wherein the guide portion comprises a guide channel extending in an axial direction of the rotation shaft (1); the cross section of the guide passage gradually increases in the flow direction of the lubricating oil.
5. The rotor assembly according to claim 4, wherein the guide portion further comprises a guide thread (5), the guide channel having a guide surface; on a longitudinal section of the rotating shaft, the guide surface is arranged obliquely relative to the extension direction of the rotating shaft (1) so that the cross section of the guide channel is gradually increased in the flowing direction of the lubricating oil; the guide thread (5) is arranged on the guide surface.
6. The rotor assembly according to claim 1, wherein the oil passage (4) comprises a first oil outlet hole (21); the first oil outlet hole (21) is formed in the inner ring of the first bearing portion (2), and the first oil outlet hole (21) is communicated with the oil path (4); the position of the first oil outlet hole (21) corresponds to the position of the balls of the first bearing part (2).
7. The rotor assembly according to claim 1, wherein the oil passage (4) comprises an oil inlet passage (41), the oil inlet passage (41) extending from the first bearing portion (2) to the second bearing portion (3), and through which oil inlet passage (41) lubricating oil can flow from the first bearing portion (2) to the second bearing portion (3).
8. The rotor assembly according to claim 1, wherein the oil circuit (4) further comprises an oil return path (42), the oil return path (42) extending from the second bearing portion (3) to the first bearing portion (2), wherein lubricating oil can flow from the second bearing portion (3) to the first bearing portion (2) through the oil return path (42).
9. The rotor assembly according to any one of claims 1 to 8, wherein when the oil passage (4) has a guide portion including a guide passage and a guide screw thread (5), and the oil passage (4) includes an oil inlet passage (41), the oil inlet passage (41) includes a first guide section forming a first guide passage (411), an inner wall of the first guide passage (411) forming an included angle a on a longitudinal section of the rotating shaft (1), wherein,
n is the rotation speed of the rotor assembly; r is the radius of the oil path (4).
10. A rotor assembly according to any one of claims 1-8, wherein when the oil path (4) has a guide portion comprising a guide passage and a guide thread (5), an inner wall of the guide passage comprises a guide surface, and the oil path (4) comprises an oil return path (42) and an oil inlet path (41), the oil return path (42) comprises a second guide section forming a second guide passage (421); the inner wall of the second guide channel (421) comprises a second guide surface (422), the second guide surface (422) is obliquely arranged relative to the extension direction of the rotating shaft (1), the inclination angle of the second guide surface (422) relative to the extension direction of the rotating shaft (1) is b,
n is the rotation speed of the rotor assembly; m is the total mass of the lubricating oil in the oil way (4); g is the acceleration of gravity; r is the cross-sectional radius of the oil inlet passage (41).
11. A rotor assembly as claimed in claim 10, wherein the thread pitch angle of the guide thread (5) is greater than or equal to the pitch angle of the second lead surface with respect to the extension direction of the rotation axis (1).
12. The rotor assembly according to claim 1, wherein an oil amount detector (6) is provided on the first bearing portion (2), the oil amount detector (6) being for detecting an amount of lubricating oil in the first bearing portion (2).
13. An electrical machine comprising a rotor assembly, wherein the rotor assembly is as claimed in any one of claims 1 to 12.
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| CN202110892346.7A CN113595310A (en) | 2021-08-04 | 2021-08-04 | Rotor subassembly and have its motor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110892346.7A CN113595310A (en) | 2021-08-04 | 2021-08-04 | Rotor subassembly and have its motor |
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| JPH07145819A (en) * | 1990-12-21 | 1995-06-06 | Makino Milling Mach Co Ltd | Lubrication structure of bearing |
| CN1666026A (en) * | 2003-07-04 | 2005-09-07 | 三菱电机株式会社 | Magnetic bearing device |
| US20090250172A1 (en) * | 2006-12-29 | 2009-10-08 | Sidel Holdings & Technology Sa | Device for cutting labels in a labelling machine |
| CN205350103U (en) * | 2016-02-26 | 2016-06-29 | 绍兴文理学院 | Self -lubricating sliding bearing |
| CN107270083A (en) * | 2017-07-03 | 2017-10-20 | 珠海格力节能环保制冷技术研究中心有限公司 | A kind of rotor shaft bearings lubrication system, motor and control method |
| CN213206311U (en) * | 2020-07-31 | 2021-05-14 | 苏州瑞泰精密塑胶有限公司 | Bearing with lubricating and heat-dissipating structure |
| CN215419868U (en) * | 2021-08-04 | 2022-01-04 | 珠海格力电器股份有限公司 | Rotor subassembly and have its motor |
-
2021
- 2021-08-04 CN CN202110892346.7A patent/CN113595310A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07145819A (en) * | 1990-12-21 | 1995-06-06 | Makino Milling Mach Co Ltd | Lubrication structure of bearing |
| CN1666026A (en) * | 2003-07-04 | 2005-09-07 | 三菱电机株式会社 | Magnetic bearing device |
| US20090250172A1 (en) * | 2006-12-29 | 2009-10-08 | Sidel Holdings & Technology Sa | Device for cutting labels in a labelling machine |
| CN205350103U (en) * | 2016-02-26 | 2016-06-29 | 绍兴文理学院 | Self -lubricating sliding bearing |
| CN107270083A (en) * | 2017-07-03 | 2017-10-20 | 珠海格力节能环保制冷技术研究中心有限公司 | A kind of rotor shaft bearings lubrication system, motor and control method |
| CN213206311U (en) * | 2020-07-31 | 2021-05-14 | 苏州瑞泰精密塑胶有限公司 | Bearing with lubricating and heat-dissipating structure |
| CN215419868U (en) * | 2021-08-04 | 2022-01-04 | 珠海格力电器股份有限公司 | Rotor subassembly and have its motor |
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