CN109639054B - Motor stator with oil cooling system - Google Patents
Motor stator with oil cooling system Download PDFInfo
- Publication number
- CN109639054B CN109639054B CN201811252838.4A CN201811252838A CN109639054B CN 109639054 B CN109639054 B CN 109639054B CN 201811252838 A CN201811252838 A CN 201811252838A CN 109639054 B CN109639054 B CN 109639054B
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- Prior art keywords
- oil
- stator
- housing
- shell
- inner housing
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- 238000001816 cooling Methods 0.000 title claims abstract description 85
- 238000004804 winding Methods 0.000 claims abstract description 85
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 38
- 238000007789 sealing Methods 0.000 claims description 24
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 238000003754 machining Methods 0.000 abstract description 4
- 239000003921 oil Substances 0.000 description 495
- 239000007921 spray Substances 0.000 description 32
- 238000010586 diagram Methods 0.000 description 13
- 238000004891 communication Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000004026 adhesive bonding Methods 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000002826 coolant Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
The embodiment of the invention discloses a motor stator with an oil cooling system, which is characterized by comprising the following components: the stator winding is sleeved with a stator core, two ends of the stator winding respectively extend out of two sides of the stator core to form winding end parts on two sides, the inner shell is sleeved outside the stator core, and the two end covers respectively cover two ends of the outer shell; the shell is provided with radial oil inlet holes, and the cover wall of any end cover is provided with axial oil outlet holes; the inner shell is provided with an oil duct which is axially communicated with the two ends of the inner shell, at least one oil duct is communicated with the oil inlet, and at least one oil duct is communicated with the oil outlet. The embodiment of the invention uses an inner shell structure and an outer shell structure in an oil cooling system. The inner and outer shells are simple in structure and few in parts needing machining. The mass production process has the advantages of good manufacturability, low cost, high efficiency and reliable quality.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a motor stator with an oil cooling system.
Background
The electric drive power assembly is a power source of the new energy automobile, and the motor is used as a key component for mutually converting electric energy and mechanical energy, and the cooling effect directly influences the performance of the motor.
The cooling scheme of the driving motor comprises air cooling, water cooling and oil cooling, and the oil cooling motor has the advantages that a cooling medium can be directly contacted with the winding, and the heat dissipation effect is better.
However, the inventors have found that in the prior art motor oil cooling solutions, the stator core sections are cooled only without the stator winding heads, and the stator winding heads are cooled only without the core sections, which is achieved both by the present invention. In the scheme of cooling the stator core section: some of the stator cores need to be grooved in the inner cavity of the shell, so that the stator cores are difficult to manufacture by using an efficient production process, the mass production process is poor, and meanwhile, the continuity of the cavity fixedly connected with the outer ring of the stator core is damaged, so that the connection reliability is not facilitated; there is a need to open holes in the stator core, for example, in chinese patent application No. CN201520645900.1, where oil can directly contact the core, but after the holes are made in the core, the outer diameter of the core is increased, the power density is reduced, and the amount of silicon steel is increased, so that the cost is increased.
For example: the chinese patent with application No. cn2015110819697a.x is mainly a cooling assembly for cooling the end portion of a stator winding, the cooling assembly includes a cooling channel for delivering a cooling medium to the end portion of the stator winding, a liquid inlet end of the cooling channel is connected with an external cooling source, and a liquid outlet end of the cooling channel is located at two end positions of the stator winding. However, in this embodiment, the first cooling passage is formed between the inner casing and the outer casing, and the drain passage is formed in the outer casing, and the oil outlet is formed in the casing. Therefore, in order to leave a cooling passage, the inner case and the outer case of the cn2015110819697a.x have only two-position contact, the contact area is small, the connection reliability between the inner case and the outer case is poor, and the torque that can be transmitted is small. Meanwhile, as only two supports are arranged between the inner shell and the outer shell, the rest space is all overhanging. After the stator core is connected with the inner shell, the force in the direction of the red arrow is shown on the inner shell, so that the middle of the inner shell is concave, and the connection reliability between the stator core and the inner shell is poor. Finally, the manufacturing and processing of the liquid discharge channel on the outer shell are difficult, and even if the liquid discharge channel can be manufactured, the qualification rate is low, the cost is high, and the mass production manufacturability of the product is poor.
For example: chinese patent application No. CN201520537263.6, which can realize cooling of the stator core, has the following disadvantages: no cooling of the stator coil ends; the inner cavity of the shell is provided with an axial groove, the contact surface between the shell and the stator core is not a whole circle, and the fixing effect is poor; the need to manufacture grooves in the housing makes it difficult to manufacture the grooves in a circle using high pressure casting, which is inefficient and costly if machined, making the structure unsuitable for mass production.
Disclosure of Invention
Based on this, it is necessary to provide a motor stator with an oil cooling system for solving the technical problem that the oil cooling effect of the motor in the prior art is poor.
The invention provides a motor stator with an oil cooling system, comprising: the stator winding is sleeved with an iron core, two ends of the stator winding respectively extend out of two sides of the iron core to form winding end parts on two sides, the inner shell is sleeved outside the iron core, and the two end covers respectively cover two ends of the outer shell;
the shell is provided with radial oil inlet holes, and the cover wall of any end cover is provided with axial oil outlet holes;
The inner shell is provided with an oil duct which is axially communicated with the two ends of the inner shell, at least one oil duct is communicated with the oil inlet, and at least one oil duct is communicated with the oil outlet.
Further, at least one of the two ends of the oil duct is sealed, and the two ends of the inner wall of the inner shell are provided with radial blind holes communicated with the oil duct with the two sealed ends, and the blind holes are opened towards the axis of the inner shell.
Still further, the oil inlet is provided in the upper half of the outer case, the oil outlet is provided in the lower half of the cover wall of the first end cover or the lower half of the cover wall of the second end cover, and the blind hole is provided in the lower half of the inner case.
Further, two ends of the inner shell extend out of the iron core respectively.
Still further, the inner shell includes multistage sub-shell, and every section sub-shell overlaps respectively outside the iron core, and every section sub-shell all is equipped with the axial and link up the sub-oil duct at sub-shell both ends, the sub-oil duct intercommunication of multistage sub-shell forms the oil duct.
Further, the oil guide rings are also provided with two oil guide rings, and the inner wall of each oil guide ring is provided with a radial oil nozzle facing the circle center;
the two ends of the outer shell extend out of the two ends of the inner shell, the two oil guide rings are respectively arranged at the two ends of the inner shell, the outer wall of each oil guide ring is abutted against the inner wall of the outer shell, the front end of each oil guide ring is abutted against the end cover, the rear end of each oil guide ring is abutted against the end part of the inner shell, the radial projection of the oil nozzle falls on the winding end part, and a preset gap is reserved between the oil nozzle and the winding end part;
The oil nozzle is internally provided with an oil injection hole communicated with the inner wall of the oil guide ring, the oil guide ring is provided with an annular oil groove communicated with the oil duct, and the oil groove is communicated with the oil injection hole.
Further, a sealing device is provided between the oil guide ring and the inner wall of the outer case and between the oil guide ring and the inner case.
Furthermore, the rear end of the oil guide ring is provided with a first protrusion which is inserted into the inner shell and abuts against the inner wall of the inner shell, and a preset gap is reserved between the first boss and the iron core.
Still further, the rear end of leading the oil ring is equipped with inserts the inner shell and contradicts the second boss of iron core, the second boss with leave between the inner wall of inner shell with the space of annular oil groove intercommunication.
Still further, the front end of the oil guide ring is provided with a third boss inserted into the end cover.
The embodiment of the invention uses an inner shell structure and an outer shell structure in an oil cooling system. The inner and outer shells are simple in structure and few in parts needing machining. The mass production process has the advantages of good manufacturability, low cost, high efficiency and reliable quality. Meanwhile, the oil rings at the two ends are simple in structure and convenient to assemble. The oil ring is fixed by an outer circle in the radial direction and by the end face of the inner shell and the spigot of the end cover in the axial direction. The oil at two ends of the motor is communicated by adding a sealing plug at the corresponding position of the inner shell and forming a radial hole, so that the structure is simple and reliable, and the manufacturability is good.
Drawings
FIG. 1 is an exploded view of an electric motor having an oil cooling system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a casing structure of an electric motor with an oil cooling system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a cross-section of a casing of an electric machine with an oil cooling system according to an embodiment of the present invention;
FIG. 4 is a top view of an oil guide ring for an electric motor having an oil cooling system according to an alternative embodiment of the present invention;
FIG. 5 is a bottom view of an oil guide ring for an electric motor having an oil cooling system according to an alternative embodiment of the present invention;
FIG. 6 is an enlarged partial schematic view of FIG. 5;
FIG. 7 is a schematic illustration of an end cap assembly for an electric motor having an oil cooling system according to an alternative embodiment of the present invention;
FIG. 8 is an exploded view of a motor rotor assembly for a motor having an oil cooling system according to an alternative embodiment of the present invention;
FIG. 9 is a perspective view of a dynamic balance plate of an electric motor having an oil cooling system according to an alternative embodiment of the present invention;
FIG. 10 is a front view of a dynamic balance board of an electric motor having an oil cooling system according to an alternative embodiment of the present invention;
FIG. 11 is a cross-sectional view of A-A of a dynamic balance plate of an electric motor having an oil cooling system according to an alternative embodiment of the present invention;
FIG. 12 is a cross-sectional view of an electric machine having an oil cooling system according to an alternative embodiment of the present invention;
FIG. 13 is an enlarged view of the dashed box of FIG. 12;
fig. 14 is a schematic view of an oil path of a casing of a motor with an oil cooling system according to an alternative embodiment of the present invention.
FIG. 15 is an exploded view of an electric motor with an oil cooling system according to an embodiment of the present invention;
FIG. 16 is a schematic view of an outer housing according to an embodiment of the present invention;
FIG. 17 is a schematic view of an end cap according to an embodiment of the present invention;
FIG. 18 is a schematic perspective view of an inner housing according to an embodiment of the present invention;
FIG. 19 is a cross-sectional view of FIG. 18;
FIG. 20 is a front view of FIG. 18;
FIG. 21 is a cross-sectional view A-A of FIG. 20;
FIG. 22 is an enlarged view of the dashed box B of FIG. 21;
FIG. 23 is a schematic diagram of a stator winding structure according to an embodiment of the present invention;
FIG. 24 is a schematic perspective view of an oil guiding ring according to an embodiment of the present invention;
FIG. 25 is a cross-sectional view of FIG. 24;
FIG. 26 is an enlarged view of the dashed box C of FIG. 25;
FIG. 27 is a cross-sectional view of an electric machine with an oil cooling system according to an embodiment of the present invention;
FIG. 28 is an enlarged view of the dashed box D of FIG. 27;
FIG. 29 is an enlarged view of the dashed box E of FIG. 27;
FIG. 30 is a front view of an alternative embodiment oil guide ring of the present invention;
FIG. 31 is a cross-sectional view of FIG. 30;
FIG. 32 is an enlarged view of the dashed box of FIG. 31;
FIG. 33 is a cross-sectional view of an electric machine having an oil cooling system according to an alternative embodiment of the present invention;
FIG. 34 is a front view of an alternative embodiment oil guide ring of the present invention;
FIG. 35 is a cross-sectional view of FIG. 34;
FIG. 36 is an enlarged view of the dashed box of FIG. 35;
FIG. 37 is a cross-sectional view of an electric machine having an oil cooling system according to an alternative embodiment of the present invention;
FIG. 38 is a front view of an alternative embodiment oil guide ring of the present invention;
FIG. 39 is a cross-sectional view of FIG. 38;
FIG. 40 is an enlarged view of the dashed box of FIG. 39;
FIG. 41 is a cross-sectional view of an electric machine having an oil cooling system according to an alternative embodiment of the present invention;
FIG. 42 is a front view of an alternative embodiment oil guide ring of the present invention;
FIG. 43 is a cross-sectional view of FIG. 42;
FIG. 44 is an enlarged view of the dashed box of FIG. 43;
FIG. 45 is a cross-sectional view of an electric machine having an oil cooling system according to an alternative embodiment of the present invention;
FIG. 46 is a schematic diagram showing the combination of an inner housing and a stator core according to an embodiment;
FIG. 47 is a cross-sectional view of FIG. 46;
FIG. 48 is a schematic diagram of an alternative embodiment of an inner housing in combination with a stator core;
FIG. 49 is a cross-sectional view of FIG. 48;
FIG. 50 is a schematic diagram showing the combination of an inner housing and a stator core according to an embodiment;
fig. 51 is a cross-sectional view of fig. 50.
Detailed Description
The invention will now be described in further detail with reference to the drawings and to specific examples.
Example 1
Fig. 1 shows an electric machine with an oil cooling system according to an embodiment of the present invention, including: the motor comprises a first end cover assembly 1, a machine shell 3, a stator armature 4, a motor rotor assembly 6 and a second end cover assembly 7, wherein the stator armature 4 is sleeved outside the motor rotor assembly 6, the machine shell 3 is sleeved outside the stator armature 4, the first end cover assembly 1 is sleeved at a first end of the machine shell 3, and the second end cover assembly 7 is sleeved at a second end of the machine shell 3;
as shown in fig. 2 and 3, the casing 3 is provided with an oil inlet 31 and an oil outlet 32, and the inner wall of the casing is further provided with a casing inner cavity oil duct 33 communicated with the oil inlet 31 and an oil return groove 36 communicated with the oil outlet 32.
Specifically, the oil-way cooling process and the principle of the invention are as follows: cooling oil enters the shell inner cavity oil duct 33 on the shell 3 from the oil inlet 31 to cool the iron core part of the stator armature 4.
Embodiments of the present invention provide a novel cooling design that may achieve efficient cooling of a stator armature core. Meanwhile, the cooling oil duct of the stator armature core is formed by assembling a groove in the inner cavity of the shell and the outer surface of the stator core, the shell has no hollow structure, and casting processing is simpler. Meanwhile, the cooling oil is in direct contact with the stator core, so that the stator core and the stator coil inside slots can be effectively cooled.
Example two
As shown in fig. 1, an alternative embodiment of the present invention provides an electric motor having an oil cooling system, including: the motor rotor comprises a first end cover assembly 1, a first oil guide ring 2, a machine shell 3, a stator armature 4, a second oil guide ring 5, a motor rotor assembly 6 and a second end cover assembly 7, wherein the stator armature 4 is sleeved outside the motor rotor assembly 6, the machine shell 3 is sleeved outside the stator armature 4, the first end cover assembly 1 is sleeved at a first end of the machine shell 3, and the second end cover assembly 7 is sleeved at a second end of the machine shell 3;
as shown in fig. 2 and 3, the casing 3 is provided with an oil inlet 31 and an oil outlet 32, the inner wall of the casing is also provided with a casing inner cavity oil duct 33 communicated with the oil inlet 31, an oil return groove 36 communicated with the oil outlet 32, a first guide ring installation clamping groove 35 close to the first end of the casing 3 and communicated with the casing inner cavity oil duct 33, and a second guide ring installation clamping groove 34 close to the second end of the casing 3 and communicated with the casing inner cavity oil duct 33, the first guide ring 2 is installed on the first guide ring installation clamping groove 35, and the second guide ring 5 is installed on the second guide ring installation clamping groove 34;
as shown in fig. 4 to 6, the back surface of the first oil guiding ring 2 is provided with a first oil guiding ring oil duct 21 communicated with the first oil guiding ring mounting clamping groove 35, the first oil guiding ring oil duct 21 is provided with a first oil guiding ring oil nozzle 22, the back surface of the second oil guiding ring 5 is provided with a second oil guiding ring oil duct 51 communicated with the second oil guiding ring mounting clamping groove 34, the second oil guiding ring oil duct 51 is provided with a second oil guiding ring oil nozzle 52, the first oil guiding ring oil nozzle 22 protrudes towards the back surface of the first oil guiding ring 2, and the second oil guiding ring oil nozzle 52 protrudes towards the back surface of the second oil guiding ring 5;
As shown in fig. 7, the first end cover assembly 1 includes a first end cover 11, and a first oil guiding plate 12 disposed on the first end cover 11 and extending toward the first end of the casing 3, the first oil guiding plate 12 can extend to the inner cavity of the motor rotor assembly 6 after the first end cover assembly 1 is sleeved on the first end of the casing 3, a first oil guiding channel 121 is disposed on the first oil guiding plate 12, the second end cover assembly 7 includes a second end cover 71, and a second oil guiding plate 12 disposed on the second end cover 71 and extending toward the second end of the casing 3, the second oil guiding plate 72 can extend to the inner cavity of the motor rotor assembly 6 after the second end cover assembly 7 is sleeved on the second end of the casing 3, and a second oil guiding channel 721 is disposed on the second oil guiding plate 72;
as shown in fig. 8-11, the motor rotor assembly 6 includes a fixing nut 61, a shaft 63, a rotor support 64, a rotor core 65 and a fixing bolt 66, which are sequentially sleeved outside the shaft 63, wherein two ends of the rotor core 65 are respectively sleeved with an annular dynamic balance plate 62, the fixing bolt passes through the rotor core 65 and the dynamic balance plates 62 at two ends to be in threaded connection with the fixing nut 61, and an oil collecting groove 621 extending along the circumferential direction and an oil throwing hole 622 extending along the radial direction are formed on one surface of each dynamic balance plate 62 facing the rotor core 65 and are communicated with the oil collecting groove 621;
As shown in fig. 12 and 13, the rotor holder 64 includes an outer sleeve 641, an inner sleeve 642 fitted inside the outer sleeve 641, and a connector 643 connecting the outer sleeve 641 and the inner sleeve 642, the inner sleeve 643 is fitted around the shaft 63, an inner wall of the outer sleeve 641 extends from the connector 643 toward the outer surface of the outer sleeve 641 in the direction of the first end cap assembly 1, an inner wall of the outer sleeve 641 extends from the connector 643 toward the outer surface of the outer sleeve 641 in the direction of the second end cap assembly 7, and a diameter of the oil collecting groove 621 is larger than a diameter of the rotor holder 64;
as shown in fig. 12-14, the oil path cooling process and principle of the embodiment of the invention are as follows: cooling liquid, such as cooling oil, enters the oil duct 33 in the inner cavity of the shell 3 from the oil inlet 31, cools the iron core part of the stator armature 4, then enters the oil guide rings 5 and 2, and then the cooling oil sprays and cools the outer rings at the two end parts of the stator armature 4 through the oil guide ring oil nozzles 22 and 52 on the oil guide rings 5 and 2, so that the oil can form injection without flowing along the back surfaces of the oil guide rings 5 and 2. After that, a part of the oil flows along the end of the stator armature 4 and then drops down or directly drops down, and then reaches the oil outlet 32 through the oil return groove 36; the other part of the oil drops fall onto the first oil guiding plate 12 and the second oil guiding plate 72, the oil is guided to reach the inner cavity of the rotor bracket 64 through the first oil guiding plate 12 and the second oil guiding plate 72, and the oil flows outwards along the inclined inner cavity of the rotor bracket 64 due to the centrifugal force action of the rotation of the motor rotor 6, so that the cooling of the rotor core is realized in the process, when the oil reaches the dynamic balance plate 62, the part of the passive balance plate 62 higher than the rotor bracket 64 is blocked, then the oil enters the oil collecting groove of the dynamic balance plate 62, and the oil is thrown out from the 3 oil throwing holes to cool the inner sides of the end parts of the two ends of the coil of the stator armature 4 under the centrifugal force action.
Embodiments of the present invention provide a novel cooling design that may achieve efficient cooling of a stator armature core. Meanwhile, the cooling oil duct of the stator armature core is formed by assembling a groove in the inner cavity of the shell and the outer surface of the stator core, the shell has no hollow structure, and casting processing is simpler. Meanwhile, the cooling oil is in direct contact with the stator core, so that the stator core and the stator coil inside slots can be effectively cooled. The cooling oil of the rotor part is led into the inner cavity of the rotor by the drainage plate, a hollow shaft is not required to be manufactured, the structure is simple, and dynamic sealing is not required. The oil guide rings 2 and 5 are only required to be assembled into the clamping grooves 34 and 35 on the end face of the casing 3, and no bolts are required to fix the oil guide rings. After the final assembly is completed, the oil guide rings 2 and 5 are supported by the core of the stator armature 4 and the spigot portions of the end caps 1 and 7 in the axial direction, and are radially fixed by the shape-following of the catching grooves 34 and 35.
Example III
Fig. 15 is a schematic structural diagram of a motor stator with an oil cooling system according to an embodiment of the present invention, including: the two end covers 100, 700, an outer housing 300, an inner housing 400 and a stator winding 500, wherein the outer housing 300 is sleeved outside the inner housing 400, as shown in fig. 23, a stator iron core 501 is sleeved outside the stator winding 500, two ends of the stator winding 500 respectively extend out of two sides of the stator iron core 501 to form winding end portions 502 on two sides, the inner housing 400 is sleeved outside the stator iron core 501, and two end covers 100, 700 respectively cover two ends of the outer housing 300;
As shown in fig. 16, the outer casing 300 is provided with a radial oil inlet 301, and as shown in fig. 17, the cover wall of any one of the end covers 100, 700 is provided with an axial oil outlet;
as shown in fig. 18 to 21, the inner housing 400 is provided with oil passages 401 extending axially through both ends of the inner housing 400, at least one of the oil passages 401 communicates with the oil inlet 301, and at least one of the oil passages 401 communicates with the oil outlet.
Specifically, the end cover 100 may be a rear housing, the end cover 700 may be a front housing, the end cover 100 and the end cover 700 may be motor end covers or gearbox housings, and the outer housing 300 may be integrally formed with the end cover 100 or the end cover 700 according to requirements.
An oil outlet hole is opened in the end cap 100 or 700. As shown in fig. 17, the present embodiment opens an oil outlet hole 101 in an end cap 100.
The outer case 300 is constructed as shown in fig. 16, and an oil inlet 301 is opened at the illustrated position. The features such as the reinforcing ribs and the bolt holes at both ends of the outer case 300 are omitted from the drawings.
The structure of the inner case 400 is shown in fig. 18 to 21. The inner housing 400 is shown provided with a ring of communicating axial oil passages 401. Those skilled in the art will appreciate that other shapes and numbers of holes are within the scope of this patent. The inner cavity of the inner housing 400 is structurally and fixedly connected with the stator core, namely, the inner ring of the inner housing 400 is completely and fixedly connected with the inner cavity of the outer housing 300, namely, the inner ring and the outer ring are completely and fixedly connected with each other. The manner of attachment includes, but is not limited to, interference, keying, welding, and the like.
The outer case 300 and the inner case 400 may be separate structures, or the outer case 300 and the inner case 400 may be formed as a single structure.
As shown in fig. 24, the oil path cooling process of the present invention is as follows: cooling oil enters from the oil inlet hole 301 on the outer housing 300, the oil flows to the other side along the axial oil passage 401 on the inner housing 400, and then the oil gradually fills the axial oil passage 401 of the inner housing 400 and performs oil-spray cooling on the outer ring of the stator winding end. After being sprayed out, the oil flows along the winding end or drops below the motor cavity, and at one side of the oil outlet 101, the oil can directly reach the oil outlet 101; on the other side, the oil passes through the axial oil passage 401 of the housing 400 to the oil outlet hole side, and then to the oil outlet hole 101.
The embodiment of the invention uses an inner shell structure and an outer shell structure in an oil cooling system. The inner and outer shells are simple in structure and few in parts needing machining. The mass production process has the advantages of good manufacturability, low cost, high efficiency and reliable quality.
Example IV
Fig. 15 is a schematic structural diagram of a motor stator with an oil cooling system according to an alternative embodiment of the present invention, including: the two end covers 100, 700, an outer housing 300, an inner housing 400 and a stator winding 500, wherein the outer housing 300 is sleeved outside the inner housing 400, as shown in fig. 23, a stator iron core 501 is sleeved outside the stator winding 500, two ends of the stator winding 500 respectively extend out of two sides of the stator iron core 501 to form winding end portions 502 on two sides, the inner housing 400 is sleeved outside the stator iron core 501, and two end covers 100, 700 respectively cover two ends of the outer housing 300;
As shown in fig. 16, the outer casing 300 is provided with a radial oil inlet 301, and as shown in fig. 17, the cover wall of any one of the end covers 100, 700 is provided with an axial oil outlet;
as shown in fig. 18 to 21, the inner housing 400 is provided with an oil passage 401 that axially penetrates through both ends of the inner housing 400, at least one oil passage 401 communicates with the oil inlet 301, and at least one oil passage 401 communicates with the oil outlet;
as shown in fig. 18 to 22, at least one of the oil passages 401 is sealed at both ends, and both ends of the inner wall of the inner housing 400 are provided with radial blind holes 402 communicating with the oil passages 401 sealed at both ends, and the blind holes 402 open toward the axis of the inner housing 400;
as shown in fig. 22, in this example, 5 oil channels 401 are plugged at two ends by sealing plugs 403, and 10 blind holes 402 are radially formed at corresponding positions of two ends of the sealed oil channels 401, so as to realize oil communication at two ends of a motor;
the oil inlet 301 is disposed at the upper half of the outer case 300, the oil outlet is disposed at the lower half of the cover wall of the first end cover 100 or the lower half of the cover wall of the second end cover 700, and the blind hole 402 is disposed at the lower half of the inner case 400;
both ends of the inner housing 400 extend out of the stator core 501, respectively;
As shown in fig. 46 and 47, the inner housing 400 is integrally sleeved outside the stator winding 500;
as shown in fig. 24 to 26, the oil guiding rings 200 and 600 further comprise two oil guiding rings 200 and 600, radial oil nozzles 201 and 601 facing the circle center are arranged on the inner walls of the oil guiding rings 200 and 600, and third bosses 206 and 606 inserted into the end covers 100 and 700 are arranged at the front ends of the oil guiding rings 200 and 600;
the oil guiding ring 200, 600 is provided with a certain number of third bosses 206, 606 in the axial direction, and the third bosses 206, 606 enable the seam allowance of the end cover 100, 700 to be axially fixed to the oil guiding ring 200, 600.
As shown in fig. 29, two ends of the outer housing 300 extend out of two ends of the inner housing 400, two oil guiding rings 200, 600 are respectively disposed at two ends of the inner housing 400, outer walls of the oil guiding rings 200, 600 abut against inner walls of the outer housing 300, front ends of the oil guiding rings 200, 600 abut against the end caps 100, 700, rear ends of the oil guiding rings 200, 600 abut against end portions of the inner housing 400, radial projections of the oil nozzles 201, 601 fall on the winding end portions 502, and a preset gap is left between the oil nozzles 201, 601 and the winding end portions 502;
the oil nozzles 201 and 601 are internally provided with oil spray holes 202 and 602 which are communicated with the inner wall of the oil guide ring 200, the oil guide rings 200 and 600 are provided with annular oil grooves 203 and 603 communicated with the oil duct 401, and the oil grooves 203 and 603 are communicated with the oil spray holes 202 and 602;
The oil guide rings 200 and 600 are provided with a certain number of oil spray holes 202 and 602 for carrying out oil spray cooling on the winding end part of the stator, and the oil spray holes 202 and 602 are provided with convex oil nozzle structures 201 and 601 at one side close to the winding end part 502 so as to prevent oil from flowing along the wall surfaces of the oil guide rings 200 and 600 and being incapable of being sprayed to the winding end part 502;
as shown in fig. 26 to 29, a sealing device 800 is provided between the oil guide ring 200, 600 and the inner wall of the outer case 300 and between the oil guide ring 200, 600 and the inner case 400.
The form of the seal ring is shown as an exemplary embodiment, and other forms of seal ring or sealing means, such as glue application, interference fit, and compression fit, are within the scope of the present patent.
As shown in fig. 27 to 29, the oil path cooling process and principle of the present invention are as follows: the cooling oil enters from the oil inlet 301 of the outer casing 300, and although a small portion of the oil leaks from the oil injection hole 602 of the oil guide ring 600 at the beginning, the oil flows to the other side along the axial oil passage 401 of the inner casing 400 due to the large oil inlet flow rate, and then the oil gradually fills the axial oil passage 401 of the inner casing 400 and the space formed between the oil guide rings 200 and 600 at both ends and the inner and outer casings, and at the same time the oil injection holes 202 and 602 of the oil guide rings 200 and 600 perform oil injection cooling on the outer ring of the stator winding end portion. After being sprayed out, the oil flows along the winding end 502 or drops below the motor cavity, and on one side of the oil outlet 101, the oil can directly reach the oil outlet 101; on the other side, the oil reaches the side of the oil outlet hole 101 through the structure in which sealing plugs 403 are added to both ends of the inner housing 400 and blind holes 402 (5 holes on each side in this example) are opened in the radial direction, and then reaches the oil outlet hole 101.
The invention has the following innovation points:
1. in oil cooling systems, an inner and outer shell structure is used. The inner and outer shells are simple in structure and few in parts needing machining. The mass production process has the advantages of good manufacturability, low cost, high efficiency and reliable quality.
2. The oil guiding rings at the two ends are simple in structure and convenient to assemble. The oil ring is fixed by an outer circle in the radial direction and by the end face of the inner shell and the spigot of the end cover in the axial direction.
3. The oil at two ends of the motor is communicated by adding a sealing plug at the corresponding position of the inner shell and forming a radial hole, so that the structure is simple and reliable, and the manufacturability is good.
Example five
Fig. 15 is a schematic structural diagram of a motor stator with an oil cooling system according to an alternative embodiment of the present invention, including: the two end covers 100, 700, an outer housing 300, an inner housing 400 and a stator winding 500, wherein the outer housing 300 is sleeved outside the inner housing 400, as shown in fig. 23, a stator iron core 501 is sleeved outside the stator winding 500, two ends of the stator winding 500 respectively extend out of two sides of the stator iron core 501 to form winding end portions 502 on two sides, the inner housing 400 is sleeved outside the stator iron core 501, and two end covers 100, 700 respectively cover two ends of the outer housing 300;
As shown in fig. 16, the outer casing 300 is provided with a radial oil inlet 301, and as shown in fig. 17, the cover wall of any one of the end covers 100, 700 is provided with an axial oil outlet;
as shown in fig. 18 to 21, the inner housing 400 is provided with an oil passage 401 that axially penetrates through both ends of the inner housing 400, at least one oil passage 401 communicates with the oil inlet 301, and at least one oil passage 401 communicates with the oil outlet;
as shown in fig. 18 to 22, at least one of the oil passages 401 is sealed at both ends, and both ends of the inner wall of the inner housing 400 are provided with radial blind holes 402 communicating with the oil passages 401 sealed at both ends, and the blind holes 402 open toward the axis of the inner housing 400;
as shown in fig. 22, in this example, 5 oil channels 401 are plugged at two ends by sealing plugs 403, and 10 blind holes 402 are radially formed at corresponding positions of two ends of the sealed oil channels 401, so as to realize oil communication at two ends of a motor;
the oil inlet 301 is disposed at the upper half of the outer case 300, the oil outlet is disposed at the lower half of the cover wall of the first end cover 100 or the lower half of the cover wall of the second end cover 700, and the blind hole 402 is disposed at the lower half of the inner case 400;
both ends of the inner housing 400 extend out of the stator core 501, respectively;
As shown in fig. 30 to 32, the oil guiding rings 200 and 600 further comprise two oil guiding rings 200 and 600, radial oil nozzles 201 and 601 facing the circle center are arranged on the inner walls of the oil guiding rings 200 and 600, and third bosses 206 and 606 inserted into the end covers 100 and 700 are arranged at the front ends of the oil guiding rings 200 and 600;
the oil guiding ring 200, 600 is provided with a certain number of third bosses 206, 606 in the axial direction, and the third bosses 206, 606 enable the seam allowance of the end cover 100, 700 to be axially fixed to the oil guiding ring 200, 600.
As shown in fig. 33, two ends of the outer housing 300 extend out of two ends of the inner housing 400, two oil guiding rings 200, 600 are respectively disposed at two ends of the inner housing 400, outer walls of the oil guiding rings 200, 600 abut against inner walls of the outer housing 300, front ends of the oil guiding rings 200, 600 abut against the end caps 100, 700, rear ends of the oil guiding rings 200, 600 abut against end portions of the inner housing 400, rear ends of the oil guiding rings 200, 600 are provided with first protrusions 204, 604 inserted into the inner housing 400 and abutting against inner walls of the inner housing 400, a preset gap is reserved between the first protrusions 204, 604 and the iron core 501, radial projections of the oil nozzles 201, 601 fall on the winding end portions 502, and a preset gap is reserved between the oil nozzles 201, 601 and the winding end portions 502;
The oil nozzles 201 and 601 are internally provided with oil spray holes 202 and 602 which are communicated with the inner wall of the oil guide ring 200, the oil guide rings 200 and 600 are provided with annular oil grooves 203 and 603 communicated with the oil duct 401, and the oil grooves 203 and 603 are communicated with the oil spray holes 202 and 602;
the oil guide rings 200 and 600 are provided with a certain number of oil spray holes 202 and 602 for carrying out oil spray cooling on the winding end part of the stator, and the oil spray holes 202 and 602 are provided with convex oil nozzle structures 201 and 601 at one side close to the winding end part 502 so as to prevent oil from flowing along the wall surfaces of the oil guide rings 200 and 600 and being incapable of being sprayed to the winding end part 502;
as shown in fig. 32 to 33, a contact surface 804 is formed between the oil guiding rings 200 and 600 and the inner wall of the outer housing 300, contact surfaces 802 and 803 are formed between the oil guiding rings 200 and 600 and the end of the inner housing 400, and a contact surface 801 is formed between the oil guiding rings 200 and 600 and the inner wall of the inner housing 400. Wherein, the contact surface 801 and the contact surface 803 are combined into a group, the contact surface 801 and the contact surface 804 are combined into a group, the contact surface 802 and the contact surface 803 are combined into a group, and the contact surface 802 and the contact surface 804 are combined into a group. The sealing surface can be any one of the four groups, and the sealing mode can be a sealing ring, interference fit, axial compression, gluing and the like.
Example six
Fig. 15 is a schematic structural diagram of a motor stator with an oil cooling system according to an alternative embodiment of the present invention, including: the two end covers 100, 700, an outer housing 300, an inner housing 400 and a stator winding 500, wherein the outer housing 300 is sleeved outside the inner housing 400, as shown in fig. 23, a stator iron core 501 is sleeved outside the stator winding 500, two ends of the stator winding 500 respectively extend out of two sides of the stator iron core 501 to form winding end portions 502 on two sides, the inner housing 400 is sleeved outside the stator iron core 501, and two end covers 100, 700 respectively cover two ends of the outer housing 300;
as shown in fig. 16, the outer casing 300 is provided with a radial oil inlet 301, and as shown in fig. 17, the cover wall of any one of the end covers 100, 700 is provided with an axial oil outlet;
as shown in fig. 18 to 21, the inner housing 400 is provided with an oil passage 401 that axially penetrates through both ends of the inner housing 400, at least one oil passage 401 communicates with the oil inlet 301, and at least one oil passage 401 communicates with the oil outlet;
as shown in fig. 18 to 22, at least one of the oil passages 401 is sealed at both ends, and both ends of the inner wall of the inner housing 400 are provided with radial blind holes 402 communicating with the oil passages 401 sealed at both ends, and the blind holes 402 open toward the axis of the inner housing 400;
As shown in fig. 22, in this example, 5 oil channels 401 are plugged at two ends by sealing plugs 403, and 10 blind holes 402 are radially formed at corresponding positions of two ends of the sealed oil channels 401, so as to realize oil communication at two ends of a motor;
the oil inlet 301 is disposed at the upper half of the outer case 300, the oil outlet is disposed at the lower half of the cover wall of the first end cover 100 or the lower half of the cover wall of the second end cover 700, and the blind hole 402 is disposed at the lower half of the inner case 400;
both ends of the inner housing 400 extend out of the stator core 501, respectively;
as shown in fig. 34 to 36, the oil guiding rings 200 and 600 further comprise two oil guiding rings 200 and 600, radial oil nozzles 201 and 601 facing the circle center are arranged on the inner walls of the oil guiding rings 200 and 600, and third bosses 206 and 606 inserted into the end covers 100 and 700 are arranged at the front ends of the oil guiding rings 200 and 600;
the oil guiding ring 200, 600 is provided with a certain number of third bosses 206, 606 in the axial direction, and the third bosses 206, 606 enable the seam allowance of the end cover 100, 700 to be axially fixed to the oil guiding ring 200, 600.
As shown in fig. 37, two ends of the outer housing 300 extend out of two ends of the inner housing 400, two oil guiding rings 200, 600 are respectively disposed at two ends of the inner housing 400, outer walls of the oil guiding rings 200, 600 abut against inner walls of the outer housing 300, front ends of the oil guiding rings 200, 600 abut against the end caps 100, 700, rear ends of the oil guiding rings 200, 600 abut against end portions of the inner housing 400, rear ends of the oil guiding rings 200, 600 are provided with second bosses 205, 605 inserted into the inner housing 400 and abutting against the iron core 501, a gap communicating with the annular oil grooves 203, 603 is reserved between the second bosses 205, 605 and the inner walls of the inner housing 400, radial projections of the oil nozzles 201, 601 fall on the winding end portions 502, and a preset gap is reserved between the oil nozzles 201, 601 and the winding end portions 502;
The oil nozzles 201 and 601 are internally provided with oil spray holes 202 and 602 which are communicated with the inner wall of the oil guide ring 200, the oil guide rings 200 and 600 are provided with annular oil grooves 203 and 603 communicated with the oil duct 401, and the oil grooves 203 and 603 are communicated with the oil spray holes 202 and 602;
the oil guide rings 200 and 600 are provided with a certain number of oil spray holes 202 and 602 for carrying out oil spray cooling on the winding end part of the stator, and the oil spray holes 202 and 602 are provided with convex oil nozzle structures 201 and 601 at one side close to the winding end part 502 so as to prevent oil from flowing along the wall surfaces of the oil guide rings 200 and 600 and being incapable of being sprayed to the winding end part 502;
as shown in fig. 40 to 41, contact surfaces 810 are formed between the oil guide rings 200 and 600 and the inner wall of the outer case 300, and contact surfaces 808 and 809 are formed between the oil guide rings 200 and 600 and the end portions of the inner case 400. Wherein, the contact surface 805 and the contact surface 806 are a set, and the contact surface 805 and the contact surface 807 are a set. The sealing surface can be any one of the four groups, and the sealing mode can be a sealing ring, interference fit, axial compression, gluing and the like.
Example seven
Fig. 15 is a schematic structural diagram of a motor stator with an oil cooling system according to an alternative embodiment of the present invention, including: the two end covers 100, 700, an outer housing 300, an inner housing 400 and a stator winding 500, wherein the outer housing 300 is sleeved outside the inner housing 400, as shown in fig. 23, a stator iron core 501 is sleeved outside the stator winding 500, two ends of the stator winding 500 respectively extend out of two sides of the stator iron core 501 to form winding end portions 502 on two sides, the inner housing 400 is sleeved outside the stator iron core 501, and two end covers 100, 700 respectively cover two ends of the outer housing 300;
As shown in fig. 16, the outer casing 300 is provided with a radial oil inlet 301, and as shown in fig. 17, the cover wall of any one of the end covers 100, 700 is provided with an axial oil outlet;
as shown in fig. 18 to 21, the inner housing 400 is provided with an oil passage 401 that axially penetrates through both ends of the inner housing 400, at least one oil passage 401 communicates with the oil inlet 301, and at least one oil passage 401 communicates with the oil outlet;
as shown in fig. 18 to 22, at least one of the oil passages 401 is sealed at both ends, and both ends of the inner wall of the inner housing 400 are provided with radial blind holes 402 communicating with the oil passages 401 sealed at both ends, and the blind holes 402 open toward the axis of the inner housing 400;
as shown in fig. 22, in this example, 5 oil channels 401 are plugged at two ends by sealing plugs 403, and 10 blind holes 402 are radially formed at corresponding positions of two ends of the sealed oil channels 401, so as to realize oil communication at two ends of a motor;
the oil inlet 301 is disposed at the upper half of the outer case 300, the oil outlet is disposed at the lower half of the cover wall of the first end cover 100 or the lower half of the cover wall of the second end cover 700, and the blind hole 402 is disposed at the lower half of the inner case 400;
both ends of the inner housing 400 extend out of the stator core 501, respectively;
As shown in fig. 38 to 40, the oil guiding rings 200 and 600 further comprise two oil guiding rings 200 and 600, radial oil nozzles 201 and 601 facing the circle center are arranged on the inner walls of the oil guiding rings 200 and 600, and third bosses 206 and 606 inserted into the end covers 100 and 700 are arranged at the front ends of the oil guiding rings 200 and 600;
the oil guiding ring 200, 600 is provided with a certain number of third bosses 206, 606 in the axial direction, and the third bosses 206, 606 enable the seam allowance of the end cover 100, 700 to be axially fixed to the oil guiding ring 200, 600.
As shown in fig. 41, two ends of the outer housing 300 extend out of two ends of the inner housing 400, two oil guiding rings 200, 600 are respectively disposed at two ends of the inner housing 400, outer walls of the oil guiding rings 200, 600 abut against inner walls of the outer housing 300, front ends of the oil guiding rings 200, 600 abut against the end caps 100, 700, rear ends of the oil guiding rings 200, 600 abut against end portions of the inner housing 400, radial projections of the oil nozzles 201, 601 fall on the winding end portions 502, and a preset gap is left between the oil nozzles 201, 601 and the winding end portions 502;
the oil nozzles 201 and 601 are internally provided with oil spray holes 202 and 602 which are communicated with the inner wall of the oil guide ring 200, the oil guide rings 200 and 600 are provided with annular oil grooves 203 and 603 communicated with the oil duct 401, and the oil grooves 203 and 603 are communicated with the oil spray holes 202 and 602;
The oil guide rings 200 and 600 are provided with a certain number of oil spray holes 202 and 602 for carrying out oil spray cooling on the winding end part of the stator, and the oil spray holes 202 and 602 are provided with convex oil nozzle structures 201 and 601 at one side close to the winding end part 502 so as to prevent oil from flowing along the wall surfaces of the oil guide rings 200 and 600 and being incapable of being sprayed to the winding end part 502;
as shown in fig. 40 to 41, contact surfaces 810 are formed between the oil guide rings 200 and 600 and the inner wall of the outer case 300, and contact surfaces 808 and 809 are formed between the oil guide rings 200 and 600 and the end portions of the inner case 400. Wherein, the contact surface 808 and the contact surface 809 are combined into a group, and the contact surface 808 and the contact surface 810 are combined into a group. The sealing surface can be any one of the four groups, and the sealing mode can be a sealing ring, interference fit, axial compression, gluing and the like.
Example eight
Fig. 15 is a schematic structural diagram of a motor stator with an oil cooling system according to an alternative embodiment of the present invention, including: the two end covers 100, 700, an outer housing 300, an inner housing 400 and a stator winding 500, wherein the outer housing 300 is sleeved outside the inner housing 400, as shown in fig. 23, a stator iron core 501 is sleeved outside the stator winding 500, two ends of the stator winding 500 respectively extend out of two sides of the stator iron core 501 to form winding end portions 502 on two sides, the inner housing 400 is sleeved outside the stator iron core 501, and two end covers 100, 700 respectively cover two ends of the outer housing 300;
As shown in fig. 16, the outer casing 300 is provided with a radial oil inlet 301, and as shown in fig. 17, the cover wall of any one of the end covers 100, 700 is provided with an axial oil outlet;
as shown in fig. 18 to 21, the inner housing 400 is provided with an oil passage 401 that axially penetrates through both ends of the inner housing 400, at least one oil passage 401 communicates with the oil inlet 301, and at least one oil passage 401 communicates with the oil outlet;
as shown in fig. 18 to 22, at least one of the oil passages 401 is sealed at both ends, and both ends of the inner wall of the inner housing 400 are provided with radial blind holes 402 communicating with the oil passages 401 sealed at both ends, and the blind holes 402 open toward the axis of the inner housing 400;
as shown in fig. 22, in this example, 5 oil channels 401 are plugged at two ends by sealing plugs 403, and 10 blind holes 402 are radially formed at corresponding positions of two ends of the sealed oil channels 401, so as to realize oil communication at two ends of a motor;
the oil inlet 301 is disposed at the upper half of the outer case 300, the oil outlet is disposed at the lower half of the cover wall of the first end cover 100 or the lower half of the cover wall of the second end cover 700, and the blind hole 402 is disposed at the lower half of the inner case 400;
both ends of the inner housing 400 extend out of the stator core 501, respectively;
As shown in fig. 42 to 44, the oil guiding rings 200 and 600 are further included, radial oil nozzles 201 and 601 facing the circle center are arranged on the inner walls of the oil guiding rings 200 and 600, and no boss is arranged at the front ends of the oil guiding rings 200 and 600;
the oil guiding ring 200, 600 is provided with a certain number of third bosses 206, 606 in the axial direction, and the third bosses 206, 606 enable the seam allowance of the end cover 100, 700 to be axially fixed to the oil guiding ring 200, 600.
As shown in fig. 43, two ends of the outer housing 300 extend out of two ends of the inner housing 400, two oil guiding rings 200, 600 are respectively disposed at two ends of the inner housing 400, outer walls of the oil guiding rings 200, 600 abut against inner walls of the outer housing 300, front ends of the oil guiding rings 200, 600 abut against the end caps 100, 700, rear ends of the oil guiding rings 200, 600 abut against end portions of the inner housing 400, rear ends of the oil guiding rings 200, 600 are provided with first protrusions 204, 604 inserted into the inner housing 400 and abutting against inner walls of the inner housing 400, a preset gap is reserved between the first protrusions 204, 604 and the iron core 501, radial projections of the oil tips 201, 601 fall on the winding end portions 502, and a preset gap is reserved between the oil tips 201, 601 and the winding end portions 502;
The oil nozzles 201 and 601 are internally provided with oil spray holes 202 and 602 which are communicated with the inner wall of the oil guide ring 200, the oil guide rings 200 and 600 are provided with annular oil grooves 203 and 603 communicated with the oil duct 401, and the oil grooves 203 and 603 are communicated with the oil spray holes 202 and 602;
the oil guide rings 200, 600 are provided with a certain number of oil spray holes 202, 602 for carrying out oil spray cooling on the winding end part of the stator, and the oil spray holes 202, 602 are provided with convex oil nozzle structures 201, 601 on the side close to the winding end part 502 so as to prevent oil from flowing along the wall surfaces of the oil guide rings 200, 600 and being incapable of being sprayed to the winding end part 50.
Example nine
Fig. 15 is a schematic structural diagram of a motor stator with an oil cooling system according to an alternative embodiment of the present invention, including: the two end covers 100, 700, an outer housing 300, an inner housing 400 and a stator winding 500, wherein the outer housing 300 is sleeved outside the inner housing 400, as shown in fig. 23, a stator iron core 501 is sleeved outside the stator winding 500, two ends of the stator winding 500 respectively extend out of two sides of the stator iron core 501 to form winding end portions 502 on two sides, the inner housing 400 is sleeved outside the stator iron core 501, and two end covers 100, 700 respectively cover two ends of the outer housing 300;
As shown in fig. 16, the outer casing 300 is provided with a radial oil inlet 301, and as shown in fig. 17, the cover wall of any one of the end covers 100, 700 is provided with an axial oil outlet;
as shown in fig. 18 to 21, the inner housing 400 is provided with an oil passage 401 that axially penetrates through both ends of the inner housing 400, at least one oil passage 401 communicates with the oil inlet 301, and at least one oil passage 401 communicates with the oil outlet;
as shown in fig. 18 to 22, at least one of the oil passages 401 is sealed at both ends, and both ends of the inner wall of the inner housing 400 are provided with radial blind holes 402 communicating with the oil passages 401 sealed at both ends, and the blind holes 402 open toward the axis of the inner housing 400;
as shown in fig. 22, in this example, 5 oil channels 401 are plugged at two ends by sealing plugs 403, and 10 blind holes 402 are radially formed at corresponding positions of two ends of the sealed oil channels 401, so as to realize oil communication at two ends of a motor;
the oil inlet 301 is disposed at the upper half of the outer case 300, the oil outlet is disposed at the lower half of the cover wall of the first end cover 100 or the lower half of the cover wall of the second end cover 700, and the blind hole 402 is disposed at the lower half of the inner case 400;
both ends of the inner housing 400 extend out of the stator core 501, respectively;
The inner casing 400 includes multiple sub-casings 410, two sub-casings 410 are shown in the embodiment shown in fig. 48 and 49, three sub-casings 410 are shown in the embodiment shown in fig. 48 and 49, each sub-casing 410 is respectively sleeved outside the stator core 501, each sub-casing 410 is provided with a sub-oil duct 411 which is axially and penetrates through two ends of the sub-casing 410, and the sub-oil ducts 411 of the multiple sub-casings 410 are communicated to form the oil duct 401;
as shown in fig. 24 to 26, the oil guiding rings 200 and 600 further comprise two oil guiding rings 200 and 600, radial oil nozzles 201 and 601 facing the circle center are arranged on the inner walls of the oil guiding rings 200 and 600, and third bosses 206 and 606 inserted into the end covers 100 and 700 are arranged at the front ends of the oil guiding rings 200 and 600;
the oil guiding ring 200, 600 is provided with a certain number of third bosses 206, 606 in the axial direction, and the third bosses 206, 606 enable the seam allowance of the end cover 100, 700 to be axially fixed to the oil guiding ring 200, 600.
As shown in fig. 29, two ends of the outer housing 300 extend out of two ends of the inner housing 400, two oil guiding rings 200, 600 are respectively disposed at two ends of the inner housing 400, outer walls of the oil guiding rings 200, 600 abut against inner walls of the outer housing 300, front ends of the oil guiding rings 200, 600 abut against the end caps 100, 700, rear ends of the oil guiding rings 200, 600 abut against end portions of the inner housing 400, radial projections of the oil nozzles 201, 601 fall on the winding end portions 502, and a preset gap is left between the oil nozzles 201, 601 and the winding end portions 502;
The oil nozzles 201 and 601 are internally provided with oil spray holes 202 and 602 which are communicated with the inner wall of the oil guide ring 200, the oil guide rings 200 and 600 are provided with annular oil grooves 203 and 603 communicated with the oil duct 401, and the oil grooves 203 and 603 are communicated with the oil spray holes 202 and 602;
the oil guide rings 200 and 600 are provided with a certain number of oil spray holes 202 and 602 for carrying out oil spray cooling on the winding end part of the stator, and the oil spray holes 202 and 602 are provided with convex oil nozzle structures 201 and 601 at one side close to the winding end part 502 so as to prevent oil from flowing along the wall surfaces of the oil guide rings 200 and 600 and being incapable of being sprayed to the winding end part 502;
as shown in fig. 26 to 29, a sealing device 800 is provided between the oil guide ring 200, 600 and the inner wall of the outer case 300 and between the oil guide ring 200, 600 and the inner case 400.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the embodiments of the present invention, and are not limited thereto; although embodiments of the present invention have been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. An electric machine stator having an oil cooling system, comprising: the stator winding comprises two end covers (100, 700), an outer shell (300), an inner shell (400) and a stator winding (500), wherein the outer shell (300) is sleeved outside the inner shell (400), a stator iron core (501) is sleeved outside the stator winding (500), two ends of the stator winding (500) respectively extend out of two sides of the stator iron core (501) to form winding end parts (502) on two sides, the inner shell (400) is sleeved outside the stator iron core (501), and the two end covers (100, 700) respectively cover two ends of the outer shell (300);
the outer shell (300) is provided with a radial oil inlet (301), and the cover wall of any end cover (100, 700) is provided with an axial oil outlet;
the inner shell (400) is provided with oil channels (401) which are axially communicated with two ends of the inner shell (400), at least one oil channel (401) is communicated with the oil inlet hole (301), and at least one oil channel (401) is communicated with the oil outlet hole;
the oil guiding rings (200, 600) are further included, and radial oil nozzles (201, 601) facing the circle center are arranged on the inner walls of the oil guiding rings (200, 600);
The two ends of the outer shell (300) extend out of the two ends of the inner shell (400), two oil guiding rings (200, 600) are respectively arranged at the two ends of the inner shell (400), the outer walls of the oil guiding rings (200, 600) are abutted against the inner walls of the outer shell (300), the front ends of the oil guiding rings (200, 600) are abutted against the end covers (100, 700), the rear ends of the oil guiding rings (200, 600) are abutted against the end parts of the inner shell (400), the radial projections of the oil nozzles (201, 601) fall on the winding end parts (502), and preset gaps are reserved between the oil nozzles (201, 601) and the winding end parts (502);
the oil nozzle (201, 601) is internally provided with an oil injection hole (202, 602) for conducting the inner wall of the oil guide ring (200), the oil guide ring (200, 600) is provided with an annular oil groove (203, 603) communicated with the oil duct (401), and the oil groove (203, 603) is communicated with the oil injection hole (202, 602).
2. The motor stator according to claim 1, characterized in that at least one of the oil channels (401) is sealed at both ends, and both ends of the inner wall of the inner housing (400) are provided with radial blind holes (402) communicating with the oil channels (401) sealed at both ends, the blind holes (402) being open towards the axis of the inner housing (400).
3. The motor stator according to claim 2, characterized in that the oil inlet hole (301) is provided in an upper half of the outer housing (300), the oil outlet hole is provided in a lower half of a cover wall of the first end cap (100) or a lower half of a cover wall of the second end cap (700), and the blind hole (402) is provided in a lower half of the inner housing (400).
4. The motor stator according to claim 1, characterized in that both ends of the inner housing (400) protrude from the stator core (501), respectively.
5. A motor stator according to any one of claims 1 to 3, wherein the inner housing (400) comprises a plurality of sub-housings (410), each sub-housing (410) is respectively sleeved outside the stator core (501), each sub-housing (410) is provided with a sub-oil duct (411) which is axially and penetrates through two ends of the sub-housing (410), and the sub-oil ducts (411) of the plurality of sub-housings (410) are communicated to form the oil duct (401).
6. The electric motor stator according to claim 2, characterized in that sealing means are provided between the oil guiding ring (200, 600) and the inner wall of the outer housing (300) and between the oil guiding ring (200, 600) and the inner housing (400).
7. The motor stator according to claim 2, characterized in that the rear end of the oil guiding ring (200, 600) is provided with a first boss (204, 604) inserted into the inner housing (400) and abutting against the inner wall of the inner housing (400), and a preset gap is left between the first boss (204, 604) and the iron core (501).
8. The motor stator according to claim 2, characterized in that the rear end of the oil guiding ring (200, 600) is provided with a second boss (205, 605) inserted into the inner housing (400) and abutting against the iron core (501), and a gap communicating with the annular oil groove (203, 603) is left between the second boss (205, 605) and the inner wall of the inner housing (400).
9. The motor stator according to claim 2, characterized in that the front end of the oil guiding ring (200, 600) is provided with a third boss (206, 606) inserted into the end cap (100, 700).
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| CN201811252838.4A CN109639054B (en) | 2018-10-25 | 2018-10-25 | Motor stator with oil cooling system |
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| CN201811252838.4A CN109639054B (en) | 2018-10-25 | 2018-10-25 | Motor stator with oil cooling system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110365137A (en) * | 2019-06-14 | 2019-10-22 | 国电南瑞科技股份有限公司 | A kind of motor cooling mechanism |
| CN112448524B (en) * | 2019-08-31 | 2023-08-08 | 比亚迪股份有限公司 | Motor and vehicle |
| CN113381531A (en) * | 2021-06-23 | 2021-09-10 | 臻驱科技（上海）有限公司 | Stator cooling structure and motor with same |
| CN114024380A (en) * | 2021-11-09 | 2022-02-08 | 安徽江淮汽车集团股份有限公司 | Oil-cooling flat wire motor heat dissipation ring and motor |
| CN114244022A (en) * | 2021-12-13 | 2022-03-25 | 陕西航空电气有限责任公司 | Motor with stator winding isolated from conductive cooling liquid |
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| CN109639054A (en) | 2019-04-16 |
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