CN114629298B - An oil cooling system and method for an electric motor - Google Patents
An oil cooling system and method for an electric motorInfo
- Publication number
- CN114629298B CN114629298B CN202210288070.6A CN202210288070A CN114629298B CN 114629298 B CN114629298 B CN 114629298B CN 202210288070 A CN202210288070 A CN 202210288070A CN 114629298 B CN114629298 B CN 114629298B
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- oil
- cooling
- rotor
- shell
- assembly
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
-
- 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
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
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- 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
- H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
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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
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
- H02K5/203—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium specially adapted for liquids, e.g. cooling jackets
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- 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
- H02K7/003—Couplings; Details of shafts
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- 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
- H02K7/04—Balancing means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
- H02K9/193—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil with provision for replenishing the cooling medium; with means for preventing leakage of the cooling medium
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
本发明公开了一种电机油冷系统及电机油冷方法，该电机油冷系统包括油冷壳体总成、设置在油冷壳体总成内的定子总成以及设于定子总成内且与定子总成通过轴承转动连接的转子总成，油冷壳体总成右端设有端盖总成，油冷壳体总成、定子总成与端盖总成之间设有壳体油路，转子总成内设有转子油路，油冷壳体总成上设有与壳体油路连通的壳体进油通道和壳体回油通道，转子总成上设有与转子油路连通的转子进油通道，转子油路与壳体回油通道连通；本发明可以同时冷却定子铁芯、定子绕组、转子铁芯、轴承等发热零件，以对电机进行高效、充分地冷却，并且具有较好的工艺性和成本优势。
This invention discloses an oil cooling system and method for an electric motor. The oil cooling system includes an oil cooling housing assembly, a stator assembly disposed within the oil cooling housing assembly, and a rotor assembly disposed within the stator assembly and rotatably connected to the stator assembly via bearings. An end cover assembly is provided at the right end of the oil cooling housing assembly. A housing oil passage is provided between the oil cooling housing assembly, the stator assembly, and the end cover assembly. A rotor oil passage is provided within the rotor assembly. The oil cooling housing assembly has a housing oil inlet channel and a housing oil return channel communicating with the housing oil passages. The rotor assembly has a rotor oil inlet channel communicating with the rotor oil passages. The rotor oil passages are connected to the housing oil return channel. This invention can simultaneously cool heat-generating components such as the stator core, stator windings, rotor core, and bearings, thereby achieving efficient and sufficient cooling of the motor, and has good manufacturability and cost advantages.
Description
Technical Field
The invention belongs to the technical field of motor heat dissipation, and particularly relates to a motor oil cooling system and a motor oil cooling method.
Background
With the rapid development of new energy automobiles, the pursuit of high efficiency, high power density and high rotation speed of the permanent magnet synchronous motor for automobiles is becoming a trend, and the challenges of temperature rise of the motor are also becoming more serious, so that a more efficient cooling system is needed to timely take away the heat generated during the operation of the motor, otherwise, the motor is easy to raise the temperature too high, the performance is affected by light weight, the consequences of winding burnout, magnetic steel demagnetization, bearing damage and the like are seriously caused, and the service life of the motor is seriously affected.
Generally, three ways of cooling a motor are usually adopted, including an air cooling system, a water cooling system and an oil cooling system, and the former two ways are limited by the cooling way and the cooling efficiency, so that the heat dissipation requirement of the motor is more and more difficult to meet, while the oil cooling system is still in a development stage, and the current oil cooling system has the defects of insufficient cooling, complex structure, high cost and the like.
Chinese patent CN206149098U discloses an oil-cooled motor and a vehicle, the rotor oil way of the patent is realized by a balancing plate opening and a rotor iron core opening, but only simple radial oil is thrown, a bearing cannot be cooled, and the shell oil way of the patent cannot cool the bearing, chinese patent CN111181300a discloses an oil-cooled structure of a permanent magnet synchronous motor, the shell oil way of the patent consists of an upper shell and a lower shell, the cooling oil does not have a fixed oil way after entering the shell, a plurality of parallel branches are difficult to ensure the flow direction, the rotor oil way of the patent only has simple axial oil passing holes, the cooling oil directly enters the rotor iron core oil passing holes through a rotating shaft, and the rotor iron core structure is complex.
Disclosure of Invention
In view of the defects existing in the prior art, the invention provides a motor oil cooling system and a motor oil cooling method, which can cool heating parts such as a stator core, a stator winding, a rotor core, a bearing and the like at the same time so as to sufficiently cool a motor.
The technical scheme adopted for solving the technical problems is as follows:
The utility model provides a motor oil cooling system, includes oil cooling casing assembly, sets up stator assembly in the oil cooling casing assembly and locates the stator assembly in and pass through the rotor assembly that the bearing rotates with the stator assembly and be connected, oil cooling casing assembly right-hand member is equipped with the end cover assembly, be equipped with the casing oil circuit between oil cooling casing assembly, stator assembly and the end cover assembly, be equipped with the rotor oil circuit in the rotor assembly, be equipped with on the oil cooling casing assembly with casing oil circuit intercommunication's casing oil feed passageway and casing oil return passageway, be equipped with on the rotor assembly with the rotor oil feed passageway of rotor oil circuit intercommunication, rotor oil circuit and casing oil return passageway intercommunication.
The oil cooling shell assembly comprises a main shell, oil injection rings are respectively and hermetically fixed on inner circular surfaces of the left end and the right end of the main shell, a plurality of oil passage ribs are arranged on the inner circular surface of the main shell between the two oil injection rings, the stator assembly comprises a stator iron core with tooth grooves and a stator winding wound in the tooth grooves of the stator iron core and provided with left end and right end parts, the stator iron core is arranged in the main shell, the outer circular surfaces of the stator iron core are in contact with the oil passage ribs and form interference fit, the stator winding corresponds to the oil injection rings in position on the corresponding side, a shell oil inlet channel is arranged at the left end of the main shell, a plurality of oil passage ribs, the outer circular surfaces of the stator iron core and the two oil injection rings are surrounded to form an oil transmission channel communicated with the shell oil inlet channel, the oil injection rings are provided with oil inlets communicated with the oil transmission channel, and the inner circular surfaces of the oil injection rings are provided with a plurality of oil outlet holes.
The oil return device comprises a shell, an oil return channel, an oil collecting ring, a shell oil return channel and a right side cooling oil return channel, wherein the shell oil return channel is arranged on the outer circular surface of a main shell, the end cover assembly comprises a main end cover and a bearing steel insert arranged in the main end cover, a right side bearing is arranged in the bearing steel insert, an oil collecting ring is arranged on the outer side surface of the bearing steel insert, an opening communicated with the oil collecting ring is further arranged on the bearing steel insert, an oil return hole is arranged on the main end cover, cooling oil in the oil injection channel on the left side is used for spraying the outer side of a stator winding to the left end through a plurality of oil outlet holes on the corresponding side and directly flows into the shell oil return channel, cooling oil in the oil injection channel on the right side is used for spraying the outer side of the stator winding through a plurality of oil outlet holes on the corresponding side, and part of cooling oil enters the oil collection channel on the right side through the opening and flows into the bearing surface and the inner part of the oil collecting ring and enters the shell oil return channel through the oil return channel.
Further, the axial channel formed by the key groove, the welding groove and the marking groove on the outer circular surface of the stator core is blocked by oil-resistant silicon rubber, or a plurality of punching sheets for blocking the axial channel of the outer circular surface of the stator core are arranged at the right end of the stator core.
Further, the oil duct ribs are arranged along the axial direction of the main shell, so that the oil transportation channel forms a Z-shaped channel, and the surface of the oil duct ribs is provided with axial auxiliary ribs.
Further, the oil injection ring is connected with the inner circular surface of the corresponding side end part of the main shell into a whole through friction stir welding or argon arc welding.
Further, the oil outlet is an inclined hole.
The rotor assembly comprises a hollow shaft, rotor iron cores corresponding to the positions of stator iron cores are sleeved on the hollow shaft, balance plates are fixedly sleeved on the left end and the right end of each rotor iron core, a rotor oil inlet channel is formed in an inner cavity of the hollow shaft, rotor oil outlet holes are respectively formed in the positions of the two balance plates of the hollow shaft, oil path components are arranged on the two balance plates, the left side of the oil path components comprises annular oil channels which are arranged on the right side of each balance plate and are communicated with the corresponding rotor oil outlet holes, oil inlet grooves corresponding to the corresponding rotor oil outlet holes are formed in the inner edge of each annular oil channel, a plurality of iron core oil inlet channels extend outwards from the outer edge of each annular oil channel on the right side of each balance plate, a plurality of weight reducing holes communicated with the corresponding iron core oil inlet channels are formed in the inner cavity of the hollow shaft, and cooling oil in the annular oil path components enters the corresponding weight reducing holes through the plurality of iron core oil inlet channels and is thrown into the bearing shell through the plurality of oil inlet channels.
Further, an oil seal plug is arranged at the right side of the balance plate in the hollow shaft inner cavity.
Further, the iron core oil inlet channels on the balance plate on the left side are identical in number with the avoidance holes and are distributed alternately, and the positions of the iron core oil inlet channels on the left side and the positions of the avoidance holes on the right side are in one-to-one correspondence.
Further, the left side the balance plate right side is in annular oil duct outward flange department still be equipped with a plurality of with the oil slinging passageway that iron core advances oil channel quantity is the same, iron core advances oil channel, dodges hole and oil slinging passageway and distributes in turn, the cooling oil in the annular oil duct is used for through a plurality of oil slinging passageway gets rid of stator winding inboard, and is parallel flow the casing oil return passageway.
Further, the number of the iron core oil inlet channels on the left side is 2n, n is a positive integer, two first positioning key grooves and two second positioning key grooves are respectively formed in the outer circular surface of the hollow shaft between the two balancing plates, the first positioning key grooves and the second positioning key grooves are parallel to the axis of the hollow shaft, the horizontal length of the first positioning key grooves is equal to the horizontal distance between the two balancing plates, the two second positioning key grooves are close to the right side of the balancing plates, the circumferential angle between the two first positioning key grooves is equal to the circumferential angle between the two second positioning key grooves and is 180 degrees, the circumferential angle between the first positioning key grooves and the adjacent second positioning key grooves is 90 degrees/n, the two balancing plates are identical parts in design, and the two balancing plates form an angle deviation of 90 degrees/n with each other after being positioned by the first positioning key grooves and the two second positioning key grooves during assembly, so that the left side of the plurality of rotor oil inlet channels of the balancing plates are in one-to-one correspondence to the plurality of key grooves of holes of the balancing plates.
The motor oil cooling system comprises a motor oil cooling system, a motor oil inlet channel, a motor oil outlet channel, a motor oil cooling system and a shell oil return channel, wherein the motor oil cooling system is characterized in that the two opposite sides of the balancing plates are also provided with oil guide fins or oil guide grooves, cooling oil flowing out of the rotor iron core is used for being led to a bearing through the oil guide fins or the oil guide grooves, the motor oil cooling system further comprises a motor external oil pump, a filter and a radiator, and the cooling oil in the shell oil return channel is used for sequentially passing through the motor external oil pump, the filter and the radiator and then returning to the shell oil inlet channel and the rotor oil inlet channel for recirculation.
The motor oil cooling method adopts the motor oil cooling system to cool the motor oil, and comprises the following cooling modes:
(1) Cooling oil enters the shell oil way from the shell oil inlet channel to cool the stator core, the outer side of the stator winding and the right bearing of the stator assembly, and then enters the shell oil return channel;
(2) And cooling oil simultaneously enters the rotor oil way from the rotor oil inlet channel so as to cool the rotor iron core, the inner side of the stator winding and the bearings on the left side and the right side of the rotor assembly, and then the cooling oil enters the shell oil return channel.
In the cooling mode (1), cooling oil enters the main shell of the oil cooling shell assembly from the shell oil inlet channel and flows into the oil delivery channel to cool the stator core of the stator assembly, after the cooling oil flows into the oil delivery channel for a plurality of circles, the cooling oil respectively enters the left oil injection ring and the right oil injection ring through an oil inlet on the left oil injection ring and an oil inlet on the right oil injection ring, the cooling oil in the left oil injection ring is sprayed to the outer side of the left end stator winding through a plurality of oil outlet holes on the corresponding side and directly flows into the shell oil return channel, the cooling oil in the right oil injection ring is sprayed to the outer side of the right end stator winding through a plurality of oil outlet holes on the corresponding side, and part of the cooling oil enters the oil collection ring of the end cover assembly and flows into the bearing surface and the inner on the right side through an opening of the bearing steel insert to cool the right bearing and enters the shell oil return channel through an oil return hole of the end cover assembly.
In the cooling mode (2), cooling oil enters the hollow shaft of the rotor assembly from the rotor oil inlet channel at the same time, enters the annular oil channels on the corresponding side balance plates through the rotor oil outlet holes and the oil inlet grooves at the corresponding sides respectively, enters the lightening holes of the rotor iron cores through the iron core oil inlet channels in the annular oil channels, is thrown into the oil cooling shell cavity through the avoiding holes on the balance plates, is thrown onto the bearings at the left side and the right side to cool the bearings at the left side and the right side, is thrown into the inner side of the stator winding through the oil throwing channels to cool the stator winding, and finally flows into the shell oil return channel under the action of gravity.
Compared with the prior art, the invention has the beneficial effects that:
The invention relates to an oil cooling system of a motor, which comprises an oil cooling shell assembly, a stator assembly arranged in the oil cooling shell assembly and a rotor assembly arranged in the stator assembly and rotationally connected with the stator assembly through a bearing, wherein an end cover assembly is arranged at the right end of the oil cooling shell assembly, a shell oil way is arranged between the oil cooling shell assembly and the end cover assembly, a rotor oil way is arranged in the rotor assembly, a shell oil inlet channel and a shell oil return channel which are communicated with the shell oil way are arranged on the oil cooling shell assembly, the rotor oil way is communicated with the shell oil return channel, and thus cooling oil enters the shell oil way from the shell oil inlet channel to cool a stator core, a stator winding outer side and a right side bearing of the stator assembly, and cooling oil enters the rotor oil way from the rotor oil inlet channel to cool a rotor core, the inner side of the stator winding and the left side bearing and the right side bearing of the rotor assembly.
The invention discloses an oil cooling shell assembly, which comprises a main shell, wherein oil injection rings are respectively and hermetically fixed on the inner circular surfaces of the left end and the right end of the main shell, a plurality of oil duct ribs are arranged on the inner circular surface of the main shell between the two oil injection rings, the stator assembly comprises a stator iron core with tooth grooves and a stator winding wound in the tooth grooves of the stator iron core and provided with left end and right end parts, the stator iron core is arranged in the main shell, the outer circular surface of the stator iron core contacts with the oil duct ribs and forms interference fit, the stator winding corresponds to the corresponding oil injection rings, an oil inlet channel of the shell is arranged at the left end of the main shell, the outer circular surface of the plurality of oil duct ribs, the outer circular surface of the stator iron core and the two oil injection rings are surrounded to form an oil delivery channel communicated with the oil inlet channel of the shell, an oil inlet communicated with the oil delivery channel is arranged on the oil injection ring, a plurality of oil outlet holes are arranged on the inner circular surface of the oil injection ring, the shell oil return channel is arranged on the outer circular surface of the main shell, the end cover assembly comprises a main end cover and a bearing steel insert arranged in the bearing steel insert, the right side of the bearing steel insert is arranged in the bearing steel insert, an oil collecting ring is arranged on the outer side of the main end cover, and an oil collecting ring is communicated with the oil return hole; the cooling oil enters the main shell from the shell oil inlet channel and flows to the oil delivery channel to cool the stator core, after the cooling oil flows in the oil delivery channel for a plurality of circles, the cooling oil enters the left oil injection ring and the right oil injection ring respectively through an oil inlet on the left oil injection ring and an oil inlet on the right oil injection ring, the cooling oil in the left oil injection ring is sprayed to the outer side of the left end stator winding through a plurality of oil outlet holes on the corresponding side and directly flows into the shell oil return channel, the cooling oil in the right oil injection ring is sprayed to the outer side of the right end stator winding through a plurality of oil outlet holes on the corresponding side, and a portion of the cooling oil enters the oil collection ring and flows into the right bearing surface and interior through the bore of the bearing steel insert to cool the right bearing and enters the housing oil return passage through the oil return opening in the main end cap.
The oil duct ribs are arranged along the axial direction of the main shell to form a Z-shaped channel, the inner circular surface of the main shell and the outer circular surface of the stator core form the Z-shaped oil transmission channel, the passage area of the Z-shaped oil transmission channel is equivalent to that of the water-cooled shell, cooling oil is guaranteed to fully flow through the stator core at a faster flow speed, sufficient cooling oil flow is provided, high efficiency of direct cooling is fully utilized, the stator core is efficiently and fully cooled, oil-spraying ring oil ways on the left side and the right side are connected with the oil transmission channel in series, cooling oil entering the oil inlet channel of the shell is guaranteed to be fully sprayed to the outer side of the stator winding, sufficient cooling oil flow of the stator winding is guaranteed, the oil-spraying ring is axially arranged on the inner circular surface of the main shell, the casting process is greatly simplified, the oil-spraying rings on the left side and the right side are separately processed with the main shell, the oil-spraying rings are connected with the inner circular surface of the corresponding side end of the main shell through a welding process, and the purposes of simplifying the processing process of products and reducing the final part number and managing cost are achieved.
According to the invention, an axial channel formed by a key groove, a welding groove and a marking groove on the outer circular surface of the stator core is blocked by oil-resistant silicon rubber to prevent cooling oil in the Z-shaped channel from leaking, or a plurality of punching sheets are arranged at the right end of the stator core to block the axial channel of the outer circular surface of the stator core, and axial auxiliary ribs are arranged on the surface of the oil duct ribs, so that the overflow area of the cooling oil can be increased, the strength of a main shell can be improved, the oil outlet is an inclined hole, and a better oil spraying effect can be realized by adjusting the angles of the inclined hole.
According to the invention, a rotor assembly comprises a hollow shaft, a rotor iron core corresponding to the position of a stator iron core is sleeved on the hollow shaft, balance plates are fixedly sleeved on the left end and the right end of the rotor iron core respectively, rotor oil inlet channels are formed in the inner cavity of the hollow shaft, rotor oil outlet holes are formed in the positions of the two balance plates respectively, oil path components are arranged on the two balance plates, the left oil path component comprises an annular oil duct which is arranged on the right side surface of the left balance plate and communicated with the corresponding rotor oil outlet holes, an oil inlet groove corresponding to the corresponding rotor oil outlet holes is formed in the inner edge of the left annular oil duct, a plurality of iron core oil inlet channels are outwards extended at the outer edge of the annular oil duct on the right side surface of the left balance plate, a plurality of weight reducing holes communicated with the iron core oil inlet channels are formed in the rotor iron core, a plurality of avoiding holes are formed in the outer side of the annular oil duct on the left balance plate, the iron core oil inlet channels and the number of the avoiding holes on the left balance plate are the same as the number of the avoiding holes and are alternately distributed, the positions of the left side of the iron core oil inlet channels and the right side of the iron core oil inlet channels and the oil inlet channels of the left side of the iron core and the iron core are alternately thrown out from the outer edge of the annular oil core; the cooling oil enters the hollow shaft from the rotor oil inlet channel, and enters the annular oil channels on the balance plates on the corresponding sides respectively through the rotor oil outlet holes and the oil inlet grooves on the corresponding sides, the cooling oil in the annular oil channels enters the lightening holes of the rotor iron cores through the plurality of iron core oil inlet channels, and is thrown into the oil cooling shell cavity through the plurality of avoiding holes on the balance plates, and then is thrown onto the bearings on the left side and the right side to cool the bearings on the left side and the right side, the cooling oil in the annular oil channels is thrown into the inner side of the stator winding through the plurality of oil throwing channels, to cool the stator windings and finally the cooling oil flows into the oil return channel of the housing under the action of gravity.
In the invention, the number of the oil inlet channels of the iron core on the left side is 2n, n is a positive integer, two first positioning key grooves and two second positioning key grooves are respectively arranged on the outer circular surface of the hollow shaft between two balancing plates, the first positioning key grooves and the second positioning key grooves are parallel to the axis of the hollow shaft, the horizontal length of each first positioning key groove is equal to the horizontal distance between the two balancing plates, the two second positioning key grooves are close to the right side of the balancing plates, the circumferential angle between the two first positioning key grooves is equal to the circumferential angle between the two second positioning key grooves and is 180 degrees, the circumferential angle between the first positioning key grooves and the adjacent second positioning key grooves is 90 degrees/n, the two balancing plates are identical in design, and after the two balancing plates are positioned with the hollow shaft, the two balancing plates mutually form 90 degrees/n angle deviation, so that the plurality of oil inlet channels of the balancing plates on the left side are close to the right side of the balancing plates and the two balancing plates are opposite to each other, and the two balancing plates can be arranged on the outer circular surface of the hollow shaft, and the two balancing plates are opposite to each other, and the special positions of the balancing plates can be avoided by the two positioning plates on the two circular shaft.
Because the balance plates on the left side and the right side adopt the same part, different oil ways are formed only through the difference of assembly and positioning, the number of parts is reduced, and the material cost is further reduced.
In the invention, the opposite side surfaces of the two balance plates are also provided with the oil guide fins or the oil guide grooves, so that cooling oil flowing out of the rotor core is conveniently led to the bearing, the oil throwing channel is a chute, and a better oil throwing effect is realized by adjusting the angle of each direction of the chute.
Drawings
FIG. 1 is a schematic diagram of a motor oil cooling system in a front cross-sectional view;
FIG. 2 is a schematic perspective view of an oil cooled housing assembly;
FIG. 3 is a schematic perspective view of an end cap assembly;
FIG. 4 is a schematic perspective view of the main housing;
FIG. 5 is a schematic perspective view of an oil spray ring;
FIG. 6 is a schematic perspective view of a stator assembly;
FIG. 7 is a schematic diagram of the direction of cooling oil in the oil passage of the housing;
FIG. 8 is a schematic perspective view of a rotor assembly;
FIG. 9 is a schematic perspective view of a hollow shaft;
FIG. 10 is a schematic perspective cross-sectional view of a hollow shaft;
FIG. 11 is a schematic structural view of a balance plate;
FIG. 12 is a schematic view of the structure of FIG. 11 in another direction;
fig. 13 is a schematic diagram showing the direction of cooling oil in the rotor oil passage.
The reference numerals in the figure indicate that 1, an oil cooling shell assembly, 2, a stator assembly, 3, an end cover assembly, 4, a main shell, 5, an oil injection ring, 6, a shell oil inlet channel, 7, an oil channel rib, 8, a shell oil return channel, 9, an oil inlet, 10, an oil outlet, 11, a stator core, 12, a stator winding, 13, a main end cover, 14, a bearing steel insert, 15, a bearing, 16, an oil collecting ring, 17, an oil return hole, 18, a hollow shaft, 19, a rotor core, 20, a balance plate, 21, a locking piece, 22, a rotor oil inlet channel, 23, an oil sealing plug, 24, a rotor oil outlet, 25, an annular oil channel, 26, an oil inlet groove, 27, an iron core oil inlet channel, 28, an avoidance hole, 29, an oil throwing channel, 30, a first positioning key groove, 31 and a second positioning key groove.
Detailed Description
As shown in fig. 1, an oil cooling system of a motor comprises an oil cooling shell assembly 1, a stator assembly 2 arranged in the oil cooling shell assembly 1, and a rotor assembly arranged in the stator assembly 2 and rotationally connected with the stator assembly 2 through a bearing 15, wherein an end cover assembly 3 is arranged at the right end of the oil cooling shell assembly 1, a shell oil way is arranged between the oil cooling shell assembly 1, the stator assembly 2 and the end cover assembly 3, a rotor oil way is arranged in the rotor assembly, a shell oil inlet channel 6 and a shell oil return channel 8 which are communicated with the shell oil way are arranged on the oil cooling shell assembly 1, a rotor oil inlet channel 22 communicated with the rotor oil way is arranged on the rotor assembly, and the rotor oil way is communicated with the shell oil return channel 8.
The oil cooling shell assembly 1 comprises a main shell 4, oil injection rings 5 are respectively and fixedly sealed on inner circular surfaces of the left end and the right end of the main shell 4, a plurality of oil duct ribs 7 are arranged on the inner circular surface of the main shell 4 between the two oil injection rings 5, as shown in fig. 6, the stator assembly 2 comprises a stator iron core 11 with tooth grooves and a stator winding 12 wound in the tooth grooves of the stator iron core 11 and provided with the left end and the right end, the stator iron core 11 is arranged in the main shell 4, the outer circular surface of the stator iron core contacts the oil duct ribs 7 and forms interference fit, the stator winding 12 corresponds to the positions of the corresponding side oil injection rings 5, a shell oil inlet channel 6 is arranged at the left end of the main shell 4, a plurality of oil duct ribs 7, the outer circular surface of the stator iron core 11 and the two oil injection rings 5 are surrounded to form an oil conveying channel which is communicated with the shell oil inlet channel 6, an oil inlet 9 which is communicated with the oil conveying channel is arranged on the oil injection rings 5, a plurality of oil outlet holes 10 are arranged on the inner circular surface of the oil injection rings 5, the shell oil return channel 8 is arranged on the outer circular surface of the main shell 4, as shown in fig. 3, the end cover assembly 3 comprises a main end cover 13 and a steel bearing insert 14, a steel insert 14 is arranged on the right end cover 14, an oil bearing insert 14 is arranged on the right end cover 14, and an oil inlet 16 is arranged on the main end cover 13, and an oil collector bearing 16 is also communicated with the steel insert 14, and an oil inlet 16 is arranged on the bearing 16; the cooling oil enters the main shell 4 from the shell oil inlet channel 6 and flows to the oil delivery channel to cool the stator core 11, after the cooling oil flows in the oil delivery channel for a plurality of circles, the cooling oil enters the left oil injection ring 5 and the right oil injection ring 5 respectively through the oil inlet 9 on the left oil injection ring 5 and the oil inlet 9 on the right oil injection ring 5, the cooling oil in the left oil injection ring 5 is sprayed to the outer side of the left end stator winding 12 through a plurality of oil outlet holes 10 on the corresponding side, and directly flows into the casing oil return passage 8, the cooling oil in the right oil spray ring 5 is sprayed to the outside of the right end stator winding 12 through the corresponding side plurality of oil outlet holes 10, and part of the cooling oil enters the oil collecting ring 16 and flows into the surface and inside of the right bearing 15 through the opening of the bearing steel insert 14 to cool the right bearing 15 and enters the casing oil return passage 8 through the oil return hole 17 in the main end cover 13.
As shown in fig. 2 and 4, the oil duct ribs 7 are arranged along the axial direction of the main casing 4, so that the oil duct ribs 7 form a Z-shaped oil duct, the inner circular surface of the main casing 4 and the outer circular surface of the stator core 11 form a Z-shaped oil duct, the passage area of the Z-shaped oil duct is equal to that of the water-cooled casing, cooling oil is guaranteed to fully flow through the stator core 11 at a faster flow rate, sufficient cooling oil flow rate is provided, high efficiency of direct cooling is fully utilized, the stator core 11 is efficiently and fully cooled, the casting process is greatly simplified due to the axial arrangement of the oil duct ribs 7, the axial auxiliary ribs are arranged on the surface of the oil duct ribs 7, the overflow area of cooling oil is increased, the strength of the main casing 4 is improved, the oil injection rings 5 are connected with the inner circular surfaces of the corresponding side ends of the main casing 4 into a whole through friction stir welding or argon arc welding, the oil injection rings 5 on the left side and the right side are separately processed with the main casing 4, and are connected through a welding process, the processing process is simplified, the number of final parts is reduced, the purposes of reducing production cost and management cost are achieved, the oil outlet 10 is an inclined hole, and good oil spraying effect is achieved through adjusting angles of the inclined holes.
The axial channel formed by the key groove, the welding groove and the marking groove on the outer circular surface of the stator core 11 is blocked by oil-resistant silicone rubber to avoid leakage of cooling oil in the Z-shaped channel, or the right end of the stator core 11 is provided with a plurality of punching sheets, and the special-shaped punching sheets only retain basic functional characteristics of the stator groove, the teeth and the like and are fixed with other cores in an adhesive manner, so that the axial channel of the outer circular surface of the stator core 11 is blocked.
Wherein, as shown in fig. 8-12, the rotor assembly comprises a hollow shaft 18, a rotor iron core 19 corresponding to the position of a stator iron core 11 is sleeved on the hollow shaft 18, balance plates 20 are respectively and fixedly sleeved on the left and right ends of the rotor iron core 19 by the hollow shaft 18, a rotor oil inlet channel 22 is formed in the inner cavity of the hollow shaft 18, an oil seal plug 23 is arranged on the right side of the balance plate 20, two rotor oil outlet holes 24 with 180 degrees in circumferential angle are arranged on the left side of the hollow shaft 18 at the position of the balance plate 20, two rotor oil outlet holes 24 with 180 degrees in circumferential angle are also arranged on the right side of the balance plate 20 of the hollow shaft 18, oil way components are arranged on the two balance plates 20, as shown in fig. 8, 11 and 12, the left side oil way component comprises an annular oil way 25 which is arranged on the right side of the balance plate 20 and communicated with the corresponding rotor oil outlet holes 24, the inner edge of the left annular oil duct 25 is provided with two oil inlet grooves 26 which respectively correspond to the corresponding rotor oil outlet holes 24, the right side surface of the left balance plate 20 is outwards extended at the outer edge of the annular oil duct 25 and provided with a plurality of iron core oil inlet channels 27, the rotor iron core 19 is provided with a plurality of weight reducing holes communicated with the iron core oil inlet channels 27, the left balance plate 20 is further provided with a plurality of avoidance holes 28 at the outer side of the annular oil duct 25, the iron core oil inlet channels 27 and the avoidance holes 28 on the left balance plate 20 are in the same number and are alternately distributed, the positions of the plurality of iron core oil inlet channels 27 at the left side are in one-to-one correspondence with the positions of the plurality of avoidance holes 28 at the right side, the right side surface of the left balance plate 20 is further provided with a plurality of oil throwing channels 29 which are in the same number as the iron core oil inlet channels 27 at the outer edge of the annular oil duct 25, and the iron core oil inlet channels 27 and the avoidance holes 28 are alternately distributed with the oil throwing channels 29; such that cooling oil enters the hollow shaft 18 from the rotor oil inlet passage 22, and respectively enter the annular oil channels 25 on the corresponding side balance plates 20 through the rotor oil outlet holes 24 and the oil inlet grooves 26 on the corresponding sides, cooling oil in the annular oil channels 25 enters the weight-reducing holes of the rotor iron cores 19 through the iron core oil inlet channels 27, and is thrown into the oil cooling shell cavity through the avoidance holes 28 on the balance plates 20, and then thrown onto the bearings 15 on the left side and the right side to cool the bearings 15 on the left side and the right side, the cooling oil in the annular oil channels 25 is thrown into the inner side of the stator winding 12 through the oil throwing channels 29 to cool the stator winding 12, and finally the cooling oil flows into the shell oil return channel 8 under the action of gravity.
The number of the left iron core oil inlet channels 27 is 2n, n is a positive integer, two first positioning key grooves 30 and two second positioning key grooves 31 are respectively arranged on the outer circular surface of the hollow shaft 18 between the two balancing plates 20, the first positioning key grooves 30 and the second positioning key grooves 31 are parallel to the axis of the hollow shaft 18, the horizontal length of the first positioning key grooves 30 is equal to the horizontal distance between the two balancing plates 20, the two second positioning key grooves 31 are close to the right balancing plates 20, the circumferential angle between the two first positioning key grooves 30 is equal to the circumferential angle between the two second positioning key grooves 31 and is 180 degrees, the circumferential angle between the first positioning key grooves 30 and the adjacent second positioning key grooves 31 is 90 degrees/n, the two balancing plates 20 are identical in design, and after the two balancing plates 20 are positioned with the hollow shaft 18, the two first positioning key grooves 30 and the two second positioning key grooves 31 form an angle deviation of 90 degrees/n with each other, so that the plurality of rotor oil inlet channels 22 of the left balancing plates 20 and the plurality of rotor oil inlet channels 28 of the right balancing plates 20 are avoided from corresponding to the plurality of rotor oil inlet channels 28 of the right balancing plates 20, and the two balancing plates are arranged on the same circular surface through the two special positioning key grooves 18, and the two balancing plates are arranged on the same circular shaft 18, and the two balancing plates are positioned on the same part, and can realize the same positioning plate through the two positioning key grooves and one positioning plate 18.
The motor oil cooling system further comprises a motor external oil pump, a filter and a radiator, wherein the opposite side surfaces of the two balance plates 20 are also provided with oil guide fins or oil guide grooves, cooling oil flowing out of the rotor iron core 19 is used for being led to the bearing 15 through the oil guide fins or the oil guide grooves, an oil throwing channel 29 is a chute, a better oil throwing effect is achieved through adjusting the angle of each chute, and cooling oil in the shell oil return channel 8 is used for being returned to the shell oil inlet channel 6 and the rotor oil inlet channel 22 after sequentially passing through the motor external oil pump, the filter and the radiator so as to be circulated again.
Wherein, as shown in fig. 9, the hollow shaft 18 is provided with a protrusion 32 at the left end of the left balancing plate 20, the protrusion 32 cooperates with the rotor core 19 to clamp the left balancing plate 20, and the hollow shaft 18 is provided with a locking member 21 at the right end of the right balancing plate 20 to lock the right balancing plate 20, as shown in fig. 1.
The motor oil cooling method adopts the motor oil cooling system to cool the motor oil, and comprises the following cooling modes:
(1) As shown in fig. 7, cooling oil enters the housing oil passage from the housing oil inlet passage 6 to cool the stator core 11 of the stator assembly 2, the outside of the stator winding 12 and the right bearing 15, specifically, cooling oil enters the main housing 4 of the oil-cooled housing assembly 1 from the housing oil inlet passage 6 and flows to the oil delivery passage to cool the stator core 11 of the stator assembly 2; after cooling oil flows in the oil delivery channel for a plurality of circles, the cooling oil respectively enters the left oil injection ring 5 and the right oil injection ring 5 through an oil inlet 9 on the left oil injection ring 5 and an oil inlet 9 on the right oil injection ring 5, the cooling oil in the left oil injection ring 5 is sprayed to the outer side of the left stator winding 12 through a plurality of oil outlet holes 10 on the corresponding side and directly flows into the shell oil return channel 8, the cooling oil in the right oil injection ring 5 is sprayed to the outer side of the right stator winding 12 through a plurality of oil outlet holes 10 on the corresponding side, and part of the cooling oil enters an oil collecting ring 16 of the end cover assembly 3 and flows into the surface and the inner part of the right bearing 15 through an opening of the bearing steel insert 14 so as to cool the right bearing 15 and enters the shell oil return channel 8 through an oil return hole 17 of the end cover assembly 3;
(2) As shown in fig. 13, the cooling oil enters the rotor oil path from the rotor oil inlet channel 22 at the same time to cool the rotor core 19 of the rotor assembly, the inner side of the stator winding 12 and the bearings 15 on the left and right sides, specifically, the cooling oil enters the hollow shaft 18 of the rotor assembly from the rotor oil inlet channel 22 at the same time and enters the annular oil channels 25 on the corresponding side balance plates 20 through the rotor oil outlet holes 24 and the oil inlet grooves 26 on the corresponding sides respectively, the cooling oil in the annular oil channels 25 enters the weight reducing holes of the rotor core 19 through the plurality of core oil inlet channels 27 and is thrown into the oil cooling shell cavity through the plurality of avoiding holes 28 on the balance plates 20 and is thrown onto the bearings 15 on the left and right sides to cool the bearings 15 on the left and right sides, the cooling oil in the annular oil channels 25 is thrown into the inner side of the stator winding 12 through the plurality of oil throwing channels 29 to cool the stator winding 12, and finally the cooling oil flows into the shell oil return channels 8 under the action of gravity.
The motor oil cooling system is an oil cooling system of a permanent magnet synchronous driving motor for a vehicle.
Compared with the prior art, the invention only has one main shell 4, the oil path of the shell is surrounded by the oil path rib 7 of the main shell 4 and the stator core 11, the flow direction of the oil path is in an axial Z shape, two ends of the oil path are sealed by the oil injection rings 5 welded with the main shell 4, the manufacturability of the main shell 4 is good, the rotor oil path of the invention is realized by forming complex grooves on the balance plate 20 and lightening holes on the rotor core 19, the invention comprises the annular oil path 25 for distributing the flow direction of cooling oil, the cooling oil respectively enters the core oil inlet channel 27 and the radial oil throwing channel 29 through the annular oil path 25, and the multi-path rotor oil passing is realized by using the same balance plate 20 through the special position design of the first positioning key groove 30 and the second positioning key groove 31.
In summary, the motor oil cooling system of the invention can cool the heat-generating parts such as the stator core 11, the stator winding 12, the rotor core 19, the bearing 15 and the like at the same time so as to cool the motor efficiently and sufficiently, and has better manufacturability and cost advantages.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications and substitutions should also be considered as being within the scope of the present invention.
Claims (13)
1. The motor oil cooling system is characterized by comprising an oil cooling shell assembly (1), a stator assembly (2) arranged in the oil cooling shell assembly (1) and a rotor assembly which is arranged in the stator assembly (2) and is rotationally connected with the stator assembly (2) through a bearing (15), wherein an end cover assembly (3) is arranged at the right end of the oil cooling shell assembly (1), a shell oil way is arranged between the oil cooling shell assembly (1), the stator assembly (2) and the end cover assembly (3), a rotor oil way is arranged in the rotor assembly, a shell oil inlet channel (6) and a shell oil return channel (8) which are communicated with the shell oil way are arranged on the oil cooling shell assembly (1), a rotor oil inlet channel (22) which is communicated with the rotor oil way is arranged on the rotor assembly, and the rotor oil way is communicated with the shell oil return channel (8);
The oil cooling shell assembly (1) comprises a main shell (4), oil spraying rings (5) are respectively and hermetically fixed on inner circular surfaces at the left end and the right end of the main shell (4), a plurality of oil channel ribs (7) are arranged on the inner circular surface of the main shell (4) between the two oil spraying rings (5), the stator assembly (2) comprises a stator iron core (11) with tooth grooves and a stator winding (12) which is wound in the tooth grooves of the stator iron core (11) and provided with left end and right end parts, the stator iron core (11) is arranged in the main shell (4) and the outer circular surfaces of the stator iron core are in contact with the oil channel ribs (7) to form interference fit, the stator winding (12) corresponds to the positions of the oil spraying rings (5) at the corresponding side, the shell oil inlet channel (6) is arranged at the left end of the main shell (4), the outer circular surfaces of the plurality of the oil channel ribs (7) and the stator iron core (11) are surrounded by the two oil spraying rings (5) to form a channel communicated with the oil inlet channel (6), and the oil inlet channel (5) is provided with a plurality of oil inlet holes (10) communicated with the oil inlet channel (5);
The rotor assembly comprises a hollow shaft (18), rotor iron cores (19) corresponding to the positions of stator iron cores (11) are sleeved on the hollow shaft (18), balance plates (20) are fixedly sleeved at the left end and the right end of the rotor iron cores (19) respectively, rotor oil inlet channels (22) are formed in the inner cavity of the hollow shaft (18), rotor oil outlet holes (24) are respectively formed in the positions of the two balance plates (20) on the hollow shaft (18), oil path components are arranged on the two balance plates (20), the left side oil path components comprise annular oil channels (25) which are arranged on the right side surface of the balance plates (20) and are communicated with the corresponding rotor oil outlet holes (24), oil inlet grooves (26) corresponding to the corresponding rotor oil outlet holes (24) are formed in the inner edge of the annular oil channels (25), a plurality of iron core oil inlet channels (27) are outwards extended at the outer edge of the annular oil channels (25) on the right side surface of the balance plates (20), a plurality of oil inlet channels (19) are formed in the rotor iron cores and are communicated with the annular oil inlet channels (27) through the annular oil inlet channels (25) which are further formed in the annular oil inlet channels (25) and the annular oil channels (25) which are further communicated with the annular oil inlet channels (25), and is thrown into the oil cooling shell cavity through a plurality of avoidance holes (28) so as to be thrown onto the bearing (15).
2. The motor oil cooling system according to claim 1, wherein the shell oil return channel (8) is arranged on the outer circular surface of the main shell (4), the end cover assembly (3) comprises a main end cover (13) and a bearing steel insert (14) arranged in the main end cover (13), the bearing (15) on the right side is arranged in the bearing steel insert (14), an oil collecting ring (16) is arranged on the outer side surface of the bearing steel insert (14), an opening communicated with the oil collecting ring (16) is further arranged on the bearing steel insert (14), an oil return hole (17) is arranged on the main end cover (13), cooling oil in the oil spraying ring (5) on the left side is used for spraying to the outer side of the stator winding (12) through a plurality of oil outlet holes (10) on the corresponding side and directly flows into the shell oil return channel (8), cooling oil in the oil spraying ring (5) on the right side is used for spraying to the outer side of the stator winding (12) through a plurality of oil outlet holes (10) on the corresponding side and partially flows into the oil collecting ring (17) through the oil return hole and the inner side of the shell (8) through the oil return hole (17).
3. The motor oil cooling system according to claim 1, wherein the axial channel formed by the key groove, the welding groove and the marking groove on the outer circular surface of the stator core (11) is blocked by oil-resistant silicone rubber, or a plurality of punching sheets for blocking the axial channel on the outer circular surface of the stator core (11) are arranged at the right end of the stator core (11).
4. The motor oil cooling system according to claim 1, wherein the oil duct ribs (7) are arranged along the axial direction of the main casing (4) so that the oil conveying channel forms a Z-shaped channel, and axial auxiliary ribs are arranged on the surface of the oil duct ribs (7).
5. The motor oil cooling system according to claim 1, wherein the oil outlet (10) is an inclined hole.
6. The motor oil cooling system according to claim 1, wherein the inner cavity of the hollow shaft (18) is provided with an oil seal plug (23) at the right side of the balance plate (20).
7. The motor oil cooling system according to claim 1, wherein the iron core oil inlet channels (27) on the left side of the balance plate (20) and the avoidance holes (28) are the same in number and are alternately distributed, and the positions of the iron core oil inlet channels (27) on the left side and the positions of the avoidance holes (28) on the right side are in one-to-one correspondence.
8. The motor oil cooling system according to claim 7, wherein the right side surface of the balancing plate (20) on the left side is further provided with a plurality of oil throwing channels (29) with the same number as that of the iron core oil inlet channels (27) at the outer edge of the annular oil passage (25), the iron core oil inlet channels (27), the avoiding holes (28) and the oil throwing channels (29) are distributed alternately, and cooling oil in the annular oil passage (25) is used for throwing to the inner side of the stator winding (12) through the plurality of oil throwing channels (29) and flows into the shell oil return channel (8).
9. The motor oil cooling system according to claim 8, wherein the number of the oil inlet channels (27) of the iron core on the left side is 2n, n is a positive integer, two first positioning key grooves (30) and two second positioning key grooves (31) are respectively arranged on the outer circular surface of the hollow shaft (18) between the two balancing plates (20), the first positioning key grooves (30) and the second positioning key grooves (31) are parallel to the axis of the hollow shaft (18), the horizontal length of the first positioning key grooves (30) is equal to the horizontal distance between the two balancing plates (20), the two second positioning key grooves (31) are close to the balancing plates (20) on the right side, the circumferential angle between the two first positioning key grooves (30) is equal to the circumferential angle between the two second positioning key grooves (31) and is 180 degrees, the circumferential angle between the first positioning key grooves (30) and the adjacent second positioning key grooves (31) is 90 °/n, the two balancing plates (20) are designed to be in the same angle/n between the two positioning key grooves (30) and the two positioning key grooves (30) when the two balancing plates (20) are positioned on the same angle/n, the positions of a plurality of rotor oil inlet channels (22) of the balance plate (20) on the left side and a plurality of avoidance holes (28) of the balance plate (20) on the right side are in one-to-one correspondence.
10. The motor oil cooling system according to claim 8, wherein the two balancing plates (20) are further provided with oil guide fins or oil guide grooves on opposite sides, cooling oil flowing out of the rotor iron cores (19) is used for being led to the bearing (15) through the oil guide fins or the oil guide grooves, the oil throwing channel (29) is a chute, the motor oil cooling system further comprises a motor external oil pump, a filter and a radiator, and cooling oil in the shell oil return channel (8) is used for being returned to the shell oil inlet channel (6) and the rotor oil inlet channel (22) after sequentially passing through the motor external oil pump, the filter and the radiator so as to be circulated again.
11. A motor oil cooling method, which uses the motor oil cooling system as claimed in any one of claims 1-10 for motor oil cooling, comprising the following cooling modes:
(1) Cooling oil enters the shell oil way from the shell oil inlet channel (6) to cool a stator core (11), the outer side of a stator winding (12) and a right bearing (15) of the stator assembly (2), and then enters the shell oil return channel (8);
(2) Cooling oil simultaneously enters the rotor oil way from the rotor oil inlet channel (22) to cool the rotor iron core (19), the inner side of the stator winding (12) and the bearings (15) on the left side and the right side of the rotor assembly, and then the cooling oil enters the shell oil return channel (8).
12. The method for cooling motor oil according to claim 11, wherein in the cooling mode (1), cooling oil enters the main housing (4) of the oil cooling housing assembly (1) from the housing oil inlet channel (6) and flows to the oil delivery channel to cool the stator core (11) of the stator assembly (2), after the cooling oil flows in the oil delivery channel for a plurality of circles, the cooling oil enters the left oil injection ring (5) and the right oil injection ring (5) through oil inlets (9) on the left oil injection ring (5) and oil inlets (9) on the right oil injection ring (5) respectively, the cooling oil in the left oil injection ring (5) is sprayed to the outer side of the left end stator winding (12) through a plurality of oil outlet holes (10) on the corresponding side and directly flows into the housing oil return channel (8), the cooling oil in the right side ring (5) is sprayed to the outer side of the right end stator winding (12) through a plurality of oil outlet holes (10) on the corresponding side, and part of the cooling oil enters the oil collecting ring (16) of the end cover assembly (3) and flows into the oil return channel (15) through the bearing insert (15) and the bearing insert (15) on the inner side of the bearing assembly (15).
13. The method for cooling motor oil according to claim 11, wherein in the cooling mode (2), cooling oil enters the hollow shaft (18) of the rotor assembly from the rotor oil inlet channel (22) at the same time, enters the annular oil channels (25) on the corresponding side balance plates (20) through the rotor oil outlet holes (24) and the oil inlet grooves (26) on the corresponding sides respectively, the cooling oil in the annular oil channels (25) enters the weight reducing holes of the rotor iron cores (19) through the iron core oil inlet channels (27), and is thrown into the oil cooling shell cavity through the avoiding holes (28) on the balance plates (20), and is thrown onto the bearings (15) on the left side and the right side to cool the bearings (15) on the left side and the right side, the cooling oil in the annular oil channels (25) is thrown into the inner sides of the stator windings (12) through the oil inlet channels (29) to cool the stator windings (12), and finally the cooling oil flows into the shell oil return channel (8) under the action of gravity.
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| CN202210288070.6A CN114629298B (en) | 2022-03-22 | 2022-03-22 | An oil cooling system and method for an electric motor |
| PCT/CN2022/116698 WO2023178927A1 (en) | 2022-03-22 | 2022-09-02 | Oil cooling system for motor and oil cooling method for motor |
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| WO2023178927A1 (en) * | 2022-03-22 | 2023-09-28 | 上海纳铁福传动系统有限公司 | Oil cooling system for motor and oil cooling method for motor |
| CN115411874B (en) * | 2022-08-22 | 2025-03-14 | 北京新能源汽车股份有限公司 | Oil cooling system of coaxial motor, motor and motor drive assembly |
| CN115459478B (en) * | 2022-09-30 | 2025-04-15 | 重庆智驱科技有限公司 | A high power density motor cooling structure and cooling method thereof |
| CN115580071A (en) * | 2022-10-31 | 2023-01-06 | 安徽江淮汽车集团股份有限公司 | A cooling structure and cooling method for the stator and winding of an oil-cooled motor |
| WO2024094141A1 (en) * | 2022-11-02 | 2024-05-10 | 天蔚蓝电驱动科技(江苏)有限公司 | Oil-cooled electric motor |
| CN116207889B (en) * | 2022-12-23 | 2026-03-24 | 中国第一汽车股份有限公司 | Cooling structure of electric drive system and electric drive system having it |
| CN115995919B (en) * | 2022-12-30 | 2025-10-31 | 泉峰汽车精密技术(安徽)有限公司 | An oil-cooled motor |
| CN116241547A (en) * | 2022-12-30 | 2023-06-09 | 浙江凌昇动力科技有限公司 | Motor shaft for oil-cooled motor, oil-cooled motor and motor vehicle |
| DE102023201150A1 (en) * | 2023-02-13 | 2024-08-14 | Zf Friedrichshafen Ag | Fluid guide element for an electrical machine, electrical machine and vehicle |
| CN116404781B (en) * | 2023-04-18 | 2025-10-10 | 马瑞利（中国）有限公司 | Oil circuit structure of oil-cooled motor rotor |
| CN116827036A (en) * | 2023-07-20 | 2023-09-29 | 苏州绿控新能源科技有限公司 | A drive motor with a cooling system |
| CN117927439B (en) * | 2024-03-18 | 2024-08-16 | 潍柴动力股份有限公司 | Integrated electric pump and vehicle |
| CN118367718B (en) * | 2024-03-25 | 2024-10-22 | 中国北方车辆研究所 | Integrated oil-cooled propeller motor and cooling method |
| CN119765787B (en) * | 2024-06-26 | 2025-08-22 | 双龙集团上海防爆电机盐城股份有限公司 | A rotor liquid-cooled permanent magnet motor |
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