CN218416113U

CN218416113U - Oil-cooled motor

Info

Publication number: CN218416113U
Application number: CN202222850277.6U
Authority: CN
Inventors: 代记涛; 郑江; 张鹏程; 郑泽明; 张亚平
Original assignee: Suzhou Huichuan United Power System Co Ltd
Current assignee: Suzhou Huichuan United Power System Co Ltd
Priority date: 2022-10-27
Filing date: 2022-10-27
Publication date: 2023-01-31
Anticipated expiration: 2032-10-27

Abstract

The utility model discloses an oil-cooled motor, oil-cooled motor includes stator core and stator winding, stator winding contacts with stator core's inner wall to stator winding has the terminal portion of the terminal surface salient from stator core's axial both ends, stator core includes first subassembly and second subassembly, first subassembly and second subassembly meet along stator core's axial, the surface of first subassembly is equipped with the oil duct, the second subassembly is equipped with a plurality of direction oil spout passageways that communicate with the oil outlet end of oil duct; the guide oil injection channel is provided with a first guide channel and a second guide channel, the second guide channel extends along the radial direction of the stator core, and the first guide channel extends along the axial direction of the stator core and is close to the stator winding; the oil outlet end of the oil duct is communicated with the oil inlet end of the second guide channel, and the oil outlet end of the second guide channel is communicated with the oil inlet end of the first guide channel. Thus, the cooling efficiency of the stator core is improved.

Description

Oil-cooled motor

Technical Field

The utility model relates to the technical field of electric motor, in particular to oil-cooled motor.

Background

Automobile motors are developing towards the directions of integration, high rotating speed and high power density at present, traditional water-cooled motors are relatively poor in cooling effect due to the fact that the traditional water-cooled motors are in an indirect cooling mode, the heat dissipation requirements of the motors are difficult to meet, and oil cooling is the mainstream technology of cooling the motors at present.

The cooling of the stator core of the existing automobile oil-cooled motor is realized by spraying cooling oil to a winding through oil nozzles obliquely arranged at two ends of the stator core. The nozzle that the slope was arranged piles up by a plurality of different stator punching sheets and forms, this kind of mode can lead to stator core's stator punching sheet comparatively difficult when the installation, and arrange in order to realize the nozzle slope, can cause stator core installation difficulty and the type of stator punching sheet too much, the inside of the nozzle that the slope was arranged simultaneously is step-like structure, step-like structure will increase the oil circuit and arrange the inside resistance of nozzle in the slope, in addition, the mode that prior art adopted the slope to spout can cause the coolant oil to spout and can appear sputtering behind stator winding, influence stator winding cooling efficiency.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an oil-cooled motor aims at improving the installation effectiveness of stator core winding, reducing the type and the cooling efficiency of the stator punching of direction oil spout section.

To achieve the above object, the present invention provides an oil-cooled motor including a stator core and a stator winding, the stator winding being in contact with an inner wall of the stator core and having end portions protruding from end surfaces of both axial ends of the stator core,

the stator core comprises a first assembly and a second assembly, the first assembly and the second assembly are connected along the axial direction of the stator core, an oil duct is arranged on the surface of the first assembly, and the second assembly is provided with a plurality of guide oil injection channels communicated with oil outlet ends of the oil duct;

the guide oil injection channel is provided with a first guide channel and a second guide channel, the first guide channel extends along the axial direction of the stator core and is close to the stator winding, and the second guide channel extends along the radial direction of the stator core;

the oil outlet end of the oil duct is communicated with the oil inlet end of the second guide channel, and the oil outlet end of the second guide channel is communicated with the oil inlet end of the first guide channel.

Optionally, the oil guide stator punching sheet is arranged on one side close to the first assembly and abutted against the first assembly; the oil injection stator punching sheet is arranged on one side far away from the first assembly and is abutted against the oil guide stator punching sheet;

the first guide channel is arranged on the oil injection stator punching sheet, and the second guide channel is arranged on the oil guide stator punching sheet;

the second guide channel is formed by stacking a plurality of identical oil guide stator punching sheets.

Optionally, the second component includes an oil guide stator punching and an oil injection stator punching;

the oil guide stator punching sheet is arranged on one side close to the first assembly and is abutted against the first assembly; the oil injection stator punching sheet is arranged on one side far away from the first assembly and is abutted against the oil guide stator punching sheet;

the first guide channel is arranged on the oil injection stator punching sheet, the second guide channel is arranged on the oil guide stator punching sheet, and the number of the oil guide stator punching sheets is smaller than that of the oil injection stator punching sheets;

the first guide channel is formed by stacking a plurality of identical oil injection stator punching sheets; the second guide channel is formed by stacking a plurality of identical oil guide stator punching sheets.

Optionally, the cross-sectional area of the first guide channel is smaller than the cross-sectional area of the second guide channel;

or the cross-sectional area of the first guide channel is not larger than that of the second guide channel, and the cross-sectional area of the second guide channel is smaller than that of the oil outlet end of the oil passage connected with the second guide channel.

Optionally, the pilot oil injection channel is further provided with a third pilot channel, an oil inlet end of the third pilot channel is communicated with an oil outlet end of the oil duct, and an oil outlet end of the third pilot channel is communicated with an oil inlet end of the second pilot channel;

wherein the cross-sectional area of the third guide passage is greater than the cross-sectional area of the second guide passage.

Optionally, the outer surface of the first assembly is provided with a plurality of oil passages, and the cross-sectional area of the third guide passage is larger than the cross-sectional area of the oil outlet end of a single oil passage.

Optionally, the oil injection guiding channel is further provided with a third guiding channel, the third guiding channel is arranged on the oil guiding stator punching sheet and on one side, far away from the stator winding, of the second guiding channel, and the oil outlet end of the oil duct is communicated with the oil inlet end of the second guiding channel through the third guiding channel.

Optionally, the second assembly further comprises an oil passing stator punching sheet, the oil passing stator punching sheet is arranged between the first assembly and the oil guide stator punching sheet, the guide oil injection channel is further provided with a third guide channel, and the third guide channel is arranged on the oil passing stator punching sheet.

Optionally, a projection of the first guide channel in the axial direction of the stator core falls on a connecting line between a linear portion and a rotating portion of the stator winding.

Optionally, the oil-cooled motor further includes: a housing;

the first assembly comprises a plurality of oil transportation stator punching sheets, a plurality of bulges are arranged on the outer surface of each oil transportation stator punching sheet, oil passing grooves penetrating through two opposite end surfaces of each oil transportation stator punching sheet are formed by adjacent bulges, a plurality of oil passing grooves are distributed along the circumferential direction of each oil transportation stator punching sheet, the oil passing grooves of every two adjacent oil transportation stator punching sheets are communicated, and an oil way shunt is formed at the communicated position;

the outer diameters of the oil guide stator punching sheet and the oil injection stator punching sheet are not larger than the outer diameter of the oil transportation stator punching sheet and are in contact with the shell, so that the outer surface of the oil transportation stator punching sheet, the protrusion and the shell form the oil duct.

The utility model provides a cooling oil motor, through the second guide passageway that radially sets up along stator core realize the coolant oil direction in the stator core surface oil circuit to more being close stator winding's first guide passageway, because first guide passageway is along stator core's axial setting, first guide passageway spun coolant oil is littleer with the difference in height of winding overhang, can reduce the coolant oil sputter loss when spraying the coolant oil, improves cooling efficiency.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an embodiment of an oil-cooled motor according to the present invention;

fig. 2 is a schematic structural view of a stator core of the oil-cooled motor shown in fig. 1;

FIG. 3 is a cross-sectional view of one embodiment of the stator core shown in FIG. 2;

FIG. 4 is an enlarged view of a portion of FIG. 3 at B;

FIG. 5 is a cross-sectional view of another embodiment of the stator core shown in FIG. 2;

FIG. 6 is an enlarged partial view of FIG. 5 at C;

FIG. 7 is a schematic view of the structure of the outer surface of the first component;

fig. 8 is a schematic view of the structure of the stator winding.

The reference numbers indicate:

reference numerals	Name(s)	Reference numerals	Name(s)
				100	Stator core	33	Oil injection stator punching sheet
10	First assembly	50	Projection
				11	Oil inlet	300	Oil-cooled motor
13	Oil-passing groove	310	Stator winding
				30	Second assembly	320	Casing (CN)
30a	Guiding oil spray hole	330	Oil inlet hole
				31	Oil guide stator punching sheet	313	The second guide channel
83	Straight line part	84	Rotating part
				53	Stator winding side	54	Terminal part

The realization, the functional characteristics and the advantages of the utility model are further explained by combining the embodiment and referring to the attached drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, back \8230;) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

Furthermore, the descriptions in the present application related to "first", "second", etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or to imply that the number of technical features indicated are implicitly being indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides an oil-cooled motor 300.

In the embodiment of the present invention, as shown in fig. 1 to 8 in conjunction, the oil-cooled motor 300 includes a stator core 100 and a stator winding 310, the stator winding 310 is in contact with an inner wall of the stator core 100, and the stator winding 310 has the end portions 54 protruding from end surfaces of both axial ends of the stator core 100.

Specifically, the surface of the stator core 100 may be provided with a plurality of stator slots, each stator slot may be used for placing a plurality of layers of stator windings 310, the stator windings 310 are wound in the stator slots, and each layer of stator windings 310 has a terminal portion 54 protruding from the end surface of each axial end of the stator core 100. The present embodiment achieves cooling of the stator winding 310 by cooling the terminal portions 54 of the stator winding 310. The stator winding 310 may be a loose wire winding or a flat wire winding.

The stator core 100 may include a first assembly 10 and a second assembly 30, the first assembly 10 and the second assembly 30 are connected in an axial direction of the stator core 100, an oil passage is provided on an outer surface of the first assembly 10, and the second assembly 30 is provided with a plurality of guide oil injection passages communicated with an oil outlet end of the oil passage.

Specifically, the second assemblies 30 are symmetrically arranged at two axial ends of the first assembly 10, the outer surface of the first assembly 10 may be provided with a plurality of oil passages, each oil passage may have an oil outlet end at each of the two axial ends of the first assembly 10, and since the first assembly 10 is installed at a position located in the middle of the oil-cooled motor 300, in order to enable cooling oil to enter the oil passages of the first assembly 10, an oil inlet 330 is communicated with the oil passages of the first assembly 10, so that the cooling oil can enter the oil passages of the first assembly 10 through the oil inlet 330; the cooling oil in the oil passage of the first assembly 10 may circulate along the oil passage of the first assembly 10, so as to cool the first assembly 10 of the stator core 100, and the contact area between the cooling oil and the first assembly 10 is large, so that the cooling oil flows through the outer surface of the whole first assembly 10, thereby increasing the heat dissipation effect of the motor. Wherein, the oil inlet 330 can be arranged at the top of the oil-cooled motor 300, when the oil-cooled motor 300 is cooled, the gravity of the cooling oil can be utilized to flow down to the oil passage of the first component 10, in order to ensure the cooling balance of the stator windings 310 at both sides of the oil-cooled motor 300, the oil inlet 330 can be arranged at the middle position of the top of the oil-cooled motor 300, when the oil-cooled motor 300 is cooled, the flow of the cooling oil at the end parts 54 of the stator windings 310 at both sides can be ensured to be approximately the same, thereby ensuring the heat dissipation balance of the oil-cooled motor 300.

It should be noted that the oil outlet end of the first assembly 10 may be understood as a port on the oil passage through which the cooling oil flows out, and a plurality of oil passages may be provided on the first assembly 10, and each oil passage is provided with an oil outlet end which flows to the second assembly 30 respectively. The adjacent oil passages may be communicated or not, and the embodiment of the present specification is not specifically described, and may be set according to actual needs. The hole pitch of the oil outlet ends of the oil ducts can be the same or different. It can be understood that the pitch-row of the oil outlet ends of a plurality of oil ducts is the same, so that the unified machining of a workshop is facilitated, and meanwhile, the area of each oil path after shunting is ensured to be the same, so that the temperature uniformity of each position of the stator core 100 after oil cooling is ensured.

Specifically, the oil inlet hole 330 may be provided with an oil inlet 11 at a projected position on the first assembly 10, and the cooling oil may enter the oil inlet 11 through the oil inlet hole 330, and then the cooling oil flows to the second assemblies 30 at both ends through a plurality of oil passages, respectively, and is guided by the second assemblies 30 and then injected to the terminal portions 54 of the stator windings 310. Wherein, the second subassembly 30 can be as an organic whole structure, also can be for the components of a whole that can function independently structure, when the second subassembly 30 can be as an organic whole structure, first guide passageway can be formed in the inside of second subassembly 30 through direct processing, the cooling oil when the second subassembly 30, can flow through the inside first guide passageway of second subassembly 30 to by first guide passageway with the direct injection of cooling oil to stator winding 310, cool down stator winding 310, thereby can directly realize the effect of direction injection through first guide passageway.

It is to be noted that the second assembly 30 can refer to the dotted arrow of fig. 1 for the injection mode, which is the axial injection mode, i.e., the injection in the axial direction.

Specifically, the second assembly 30 may be provided with a plurality of guiding oil injection channels communicated with the oil outlet end of the oil passage, and the guiding oil injection channels may be used for guiding the cooling oil in the oil passage to the terminal portion 54 of the stator winding 310, so as to cool the stator winding 310. The number of the guiding oil injection channels may be plural, and the plural guiding oil injection channels are arranged at equal intervals along the circumferential direction of the second assembly 30, that is, the plural guiding oil injection channels are sequentially arranged along the circumferential direction of the second assembly 30, and the plural guiding oil injection channels are distributed throughout the positions corresponding to the ends far away from the first assembly 10, so that the cooling oil can spray the end portions 54 of the stator windings 310 from different positions in the circumferential direction of the second assembly 30. The number and the arrangement mode of the guiding oil injection channels are selected according to actual requirements, and no specific requirements are made in the embodiment of the specification.

In this embodiment, the number of the guiding oil injection channels may be the same as the number of the oil passages, that is, the number of the guiding oil injection channels corresponds to the number of the oil outlet ends of the oil passages one to one; the pilot oil injection passage is provided with a first pilot passage and a second pilot passage 313, the second pilot passage 313 extending in a radial direction of the stator core 100, the first pilot passage extending in an axial direction of the stator core 100 and being adjacent to the stator winding 310. Wherein the oil outlet end of the oil passage is communicated with the oil inlet end of the second guide passage 313, and the oil outlet end of the second guide passage 313 is communicated with the oil inlet end of the first guide passage.

Specifically, the guiding oil injection channel may be provided with a radial second guiding channel 313 and an axial first guiding channel, an oil inlet end of the radial second guiding channel 313 may be communicated with an oil outlet end of an oil channel, so as to guide the cooling oil in the oil channel to the communicated first guiding channel, and then the cooling oil is injected to the terminal 54 of the stator winding 310 through the axial first guiding channel, so as to cool the stator winding 310.

Direct direction injection to stator winding 310 terminal portion 54 of cooling oil through second subassembly 30 on stator core 100, the realization is to stator winding 310's cooling, so, can directly realize the direction injection effect to the cooling oil through second subassembly 30, it needs to realize the direction injection effect to the cooling oil through setting up the oil spout ring on original oil-cooled motor 300 to have replaced, the oil circuit of cooling oil has been simplified, thereby the stator core 100 of this application need not to install again and spouts the oil ring, reduce original installation and fixed step to spouting the oil ring, improve the production efficiency in workshop, and can reduce stator core 100 internally mounted space requirement, and simultaneously, under the circumstances of original oil spout ring that sets up, stator core 100 and spout need set up the sealing member between the oil ring, consequently, corresponding can cancel the sealing member when having cancelled the oil spout ring, make stator core 100 structure simpler.

The technical scheme of this application is through the equidistant distribution of a plurality of first guide passageways along the circumference of second subassembly 30, promptly, a plurality of first guide passageways are the non-tilting in the surface arrangement mode of second subassembly 30, and is more even to stator winding 310's whole injection effect under this mode to make stator winding 310's whole cooling effect faster.

In an embodiment of the present invention, as shown in fig. 1 to 8, the stator core 100 has a radial direction, the oil outlet end of the first guiding channel radially disposed is a guiding oil injection hole 30a, and the different guiding oil injection holes 30a can be circumferentially disposed on one side of the second component 30 away from the first component 10, and are disposed on the inner edge of the second component 30 (i.e. on one side close to the stator winding 310) to inject the cooling oil to the stator winding 310 along the axial direction of the stator core 100.

In this embodiment, as shown by the dotted arrow in fig. 1, in order to realize that the cooling oil can be sprayed onto the stator winding 310 along the axial direction, the pilot oil injection hole 30a is disposed at the inner edge of the surface of the pilot oil injection section 30, so that the distance difference between the pilot oil injection hole 30a and the stator winding 310 is small, and after the cooling oil is sprayed from the pilot oil injection hole 30a, the cooling oil is sprayed onto the stator winding 310 by an axial spraying manner, thereby avoiding the cooling oil from being splashed and improving the cooling efficiency.

In practical application, the second assembly 30 may include a plurality of oil guiding stator laminations 31 and an oil spraying stator lamination 33, the oil spraying stator lamination 33 is disposed on one side far away from the first assembly 10 and abutted against the oil guiding stator lamination 31, the oil guiding stator lamination 31 is disposed on one side close to the first assembly 10 and abutted against the first assembly 10, the first guiding channel is disposed on the oil spraying stator lamination 33, and the second guiding channel 313 is disposed on the oil guiding stator lamination 31, wherein the second guiding channel is formed by stacking a plurality of identical oil guiding stator laminations 31.

Specifically, the plurality of identical oil guiding stator laminations 31 may be understood as that identical first oil guiding grooves or oil guiding holes are formed in the same position of each oil guiding stator lamination 31, and when the oil guiding stator laminations 31 are installed, the first oil guiding grooves or oil guiding holes may be aligned to form the second guiding channel 313.

Specifically, the outer diameter of the oil guide stator punching sheet 31 is not larger than the outer diameter of the stator punching sheet corresponding to the first component 10, and the outer diameter of the oil injection stator punching sheet 33 is not larger than the outer diameter of the oil guide stator punching sheet 31. In order to improve the installation efficiency, the outer diameters of the oil guide stator punching sheet 31 and the oil injection stator punching sheet 33 may be equal to the outer diameter of the stator punching sheet corresponding to the first component 10.

In practical application, when the second guide channel 313 is processed, a corresponding number of first oil guide grooves or oil guide holes may be formed in the circumferential direction of the oil guide stator stamped sheet 31 according to the number of oil passages, one end of each first oil guide groove or oil guide hole is communicated with an oil passage, the other end of each first oil guide groove or oil guide hole is communicated with the first guide channel on the oil injection stator stamped sheet 33, when the second guide channel 313 is installed, the plurality of oil guide stator stamped sheets 31 may be stacked to form the second guide channel 313, and in order to ensure the flow rate of cooling oil in the second guide channel 313, the cross-sectional area of the second guide channel 313 formed by the plurality of oil guide stator stamped sheets 31 may be not greater than the cross-sectional area of the communicated oil passages. Similarly, when the first guide channel is processed, a corresponding number of axial oil spray holes may be formed in the corresponding oil spray stator lamination 33 according to the number and position of the first oil guide grooves or the oil guide holes on the oil guide stator lamination 31, one end of each axial oil spray hole is communicated with the first oil guide groove or the oil guide hole on the oil guide stator lamination 31, and the other end of each axial oil spray hole may spray the flowing cooling oil to the terminal portion 54 of the stator winding 310.

In particular, the cross-sectional area of the first guide channel can be understood as: the first guide channel in the axial direction is an area of the first guide channel cut by a plane perpendicular to the axial direction, wherein the axial direction may be understood as an axial direction of the stator core 100. The cross-sectional area of the second guide channel can be understood as: the radial second guide channel is defined by the area of the second guide channel cut by a plane perpendicular to the radial direction, wherein the radial direction is understood to be the radial direction of the stator core 100.

Specifically, the first oil guiding groove may be understood as a groove formed in the oil guiding stator lamination 31, and an opening of the groove is provided with an outer edge of the oil guiding stator lamination 31. The oil guiding hole can be understood as a hole which is formed in the oil guiding stator punching sheet 31 and penetrates through two end faces of the oil guiding stator punching sheet. The size, shape, position, and the like of the first oil guide groove may be set according to actual needs, and embodiments of the present specification are not particularly limited.

Optionally, in order to ensure that the cooling oil ejected from the first guide channel is in the axial direction of the oil-cooled motor 300, the first guide channel may also be formed by stacking a plurality of identical oil-injected stator laminations 33, where the plurality of identical oil-injected stator laminations 33 may be understood as forming identical axial oil injection holes at the same position of each oil-injected stator lamination, and the axial oil injection holes may be aligned to form the first guide channel when the first guide channel is installed.

Specifically, the axial oil injection hole may be understood as a hole formed inside the oil injection stator lamination 33 and penetrating through both end faces thereof. It should be noted that the size, shape, position, and the like of the axial fuel injection hole may be set according to actual needs, and the embodiment of this specification is not specifically limited. It can be understood that the axial oil spray hole on the oil spray stator lamination 33 at the outermost side in the axial direction of the stator core 100 is the above-mentioned pilot oil spray hole 30a.

The number of the oil guide stator laminations 31 can be smaller than that of the oil injection stator laminations 33. The arrangement can ensure the injection direction of the cooling oil and save the using quantity of the oil injection stator punching sheets 33, thereby saving the cost of the oil cooling motor 300.

In an embodiment of the present invention, referring to fig. 2 to 5 and the illustration, the first guiding channel is disposed near the stator winding 310 along the axial direction, and the second guiding channel 313 is connected to a side of the first guiding channel departing from the stator winding 310, so that the cooling oil sequentially flows through the guiding oil injection hole 30a of the second guiding channel 313 and the first guiding channel and then is injected to the end portion 54 of the stator winding 310 along the axial direction.

In the present embodiment, the second assembly 30 is provided with the second guide passage 313 and the first guide passage, and it can be understood that the cooling oil flows from the oil outlet end of the oil passage to the second guide passage 313, and flows to the pilot oil injection hole 30a of the first guide passage after being guided by the second guide passage 313, and is injected from the pilot oil injection hole 30a to the terminal portion 54 of the stator winding 310. The second guide channel 313 and the first guide channel are stacked in the axial direction to form the second assembly 30, and if the second guide channel 313 or the first guide channel needs to be maintained or repaired, the single second guide channel 313 and the single first guide channel can be processed without processing the whole, so that the maintenance and repair work of workers is facilitated.

It is understood that each second guide channel 313 in the above embodiments may also correspond to a plurality of oil passages, in a manner similar to the manner in which one second guide channel 313 corresponds to one oil passage, and will not be described in detail herein.

The utility model provides a cold motor 300 of oil, through the second guide passageway 313 along the radial setting of stator core 100 realize the coolant oil direction in the first subassembly 10 surface oil circuit to more be close stator winding 310's first guide passageway in, because first guide passageway is along stator core 100's axial setting, first guide passageway spun coolant oil is littleer with winding overhang's difference in height, can reduce the coolant oil loss of sputtering when spraying the coolant oil, improve cooling efficiency. In addition, the oil injection part of the stator core 100 provided by the application only needs the oil guide stator punching sheet 31 and the oil injection stator punching sheet 33, so that the operation is convenient in the splicing process, and the installation efficiency is improved.

The cooling efficiency of the oil-cooled motor 300 is often related to the flow of the cooling oil, and in practical application, the pressure in the oil path can be increased by a confluence mode, so as to increase the flow of the cooling oil.

Specifically, the third guide channel is disposed on the oil guide stator lamination 31 and on a side of the second guide channel 313 away from the stator winding 310, an oil outlet end of the oil passage may be communicated with an oil inlet end of the second guide channel 313 through the third guide channel, the third guide channel is configured to merge cooling oil of the oil passage into the communicated second guide channel 313, the third guide channel may be on the same oil guide stator lamination 31 as the second guide channel 313, when a stator lamination corresponding to the third guide channel is produced, a plurality of first oil guide grooves or first oil guide holes corresponding to the third guide channel may be formed on the oil guide stator lamination 31 according to the number of the second guide channel 313, and a second oil guide groove or a second oil guide hole may be formed on a side of the first oil guide groove or the first oil guide hole away from the stator winding 310, so that the plurality of first oil guide grooves or the plurality of first oil guide holes are stacked to form the third guide channel, and at the same time, the plurality of second oil guide grooves or the plurality of second oil guide holes are stacked to form the third guide channel.

Optionally, the cross-sectional area of the third guide passage is larger than the cross-sectional area of the oil outlet end of the single oil passage. The cross-sectional area of the third guide channel can be understood as: the area of the third guide passage cut by a plane perpendicular to the axial direction is an area of the oil outlet end of the oil passage, and the cross-sectional area of the oil outlet end of the oil passage may be understood as an area of the oil outlet end of the oil passage cut by a plane perpendicular to the axial direction, where the axial direction may be understood as an axial direction of the stator core 100.

In this embodiment, it can be understood that the cross-sectional area of the third guiding channel is greater than the cross-sectional area of the oil outlet end of a single oil passage, that is, the cooling oil flowing out of the oil outlet end of more than one oil passage can flow to the same third guiding channel, so that guidance for at least two oil passages can be realized only by setting one third guiding channel, the structure is simple, the processing cost is low, the production difficulty of the second assembly 30 is reduced, and the cooling efficiency of the stator winding 310 is improved.

In the present embodiment, it can be understood that the number of the first guide passages is smaller than the number of the oil passages in the first assembly 10, and the oil pressure of the cooling oil can be increased, so that the flow rate of the cooling oil can be increased to improve the cooling efficiency for the stator winding 310, and in addition, the injection can be realized more intensively through the oil outlet end (the guide oil injection hole 30 a) of the first guide passage, so that the injection can be accurately performed onto the stator winding 310, and the accuracy of the injection can be improved.

In practical applications, in order to ensure the strength of the stator punching sheet corresponding to the third guide channels and the second guide channels 313, the distance between adjacent third guide channels is often set to be larger, and the too large distance between adjacent third guide channels will cause blocking of the flow of cooling oil in a part of the oil passage, so, in order to avoid the above problem, the distance between adjacent third guide channels in the embodiment of the present specification should be smaller than the width of a single-cantilever oil passage, and the width of the oil passage can be understood as the farthest distance between two sides (protrusions 50) intersecting with the outer surface of the first component 10.

This description embodiment can communicate the third guide channel with the oil outlet end of two at least oil ducts through setting up, can improve the pressure of the cooling oil in second guide channel 313, and then improve the cooling efficiency of oil-cooled motor 300, because the cross-sectional area of third guide channel is greater than second guide channel 313, should be less than the width of oil duct through the distance between the adjacent third guide channel simultaneously, can ensure that each oil duct all can communicate with second guide channel 313, avoid causing partial oil duct to not switch on when the installation, can improve the installation effectiveness simultaneously.

Optionally, the second assembly 30 further includes an oil passing stator punching sheet, the oil passing stator punching sheet is disposed between the first assembly 10 and the oil guiding stator punching sheet 31, the oil guiding channel is further provided with a third guiding channel, and the third guiding channel is disposed on the oil passing stator punching sheet.

Specifically, the outer diameter of the oil-passing stator punching sheet is not greater than the outer diameter of the stator punching sheet corresponding to the first component 10. The oil passing stator punching sheet can be arranged between the first assembly 10 and the oil guiding stator punching sheet 31, so that an oil passage on the first assembly 10 is converged into a second guiding passage 313 on the oil guiding stator punching sheet 31 through a third guiding passage on the oil passing stator punching sheet.

In practical application, the cross-sectional area of the third guide channel is larger than that of the second guide channel 313, and the third guide channel and the second guide channel 313 are in a roughly vertical position relationship.

In the present embodiment, a flat wire motor is taken as an example, and as shown in fig. 8, when the stator winding 310 is wound around the stator core 100, since the innermost stator winding 310 is smaller than the installation space of the innermost stator winding 310, the outermost stator winding 310 is retracted in the radial direction of the oil-cooled motor 300 to increase the installation space of the inner stator winding 310, and after the stator winding 310 is installed, it is necessary to twist the stator winding 310 at the welded end, and therefore, the stator winding side portion 53 is formed by the straight portion 83 linearly extending in the axial direction of the stator winding 310, and the terminal portion 54 of the stator winding is formed by the rotating portion 84 protruding to both outer sides of the stator winding side portion 53 in the axial direction, and the oil-cooled motor 300 according to the related art sprays the cooling oil onto the rotating portion 84 in an oblique spray manner, and the rotating portion 84 is substantially parallel to the axial direction, the sprayed cooling oil is refracted, and the refracted cooling oil is not able to cool the stator winding 310 again.

In order to solve the problem that the refracted cooling oil cannot cool the stator winding 310 again, the projection of the first guide channel in the axial direction of the stator core is placed on the connecting line between the linear portion 83 and the rotating portion 84 of the stator winding.

In the embodiment of the present specification, the oil injection hole of the first guiding channel is disposed between the axial direction of the inner wall of the stator core 100 and the axial direction of the avoidance winding, and an axial oil injection manner is adopted, so that the cooling oil injected by the oil injection hole can be injected onto the avoidance winding, and because the avoidance winding and the extension line of the oil injection hole form an obtuse angle, the cooling oil after refraction can still cool the second part of the stator winding 310 and the avoidance winding, thereby greatly improving the utilization rate of the cooling oil, and further improving the cooling efficiency of the oil-cooled motor 300.

In actual operation, the cross-sectional area of the oil inlet 11 of the oil-cooled motor 300 is often smaller than the sum of the cross-sectional areas of all the oil passages, and in order to ensure the pressure of the cooling oil in each oil passage, the sum of the cross-sectional areas of all the oil spray holes in the oil spray channel can be set to be not larger than the cross-sectional area of the oil inlet 11.

On the basis of the above embodiment, the cross-sectional area of the first guide passage is not larger than the same as that of the second guide passage 313, and the cross-sectional area of the second guide passage 313 is smaller than that of the oil outlet end of the oil passage connected thereto.

In this embodiment, it can be understood that the shape of the first guiding channel may be a circle or a square, and when the cross-sectional area of the first guiding channel is smaller than that of the second guiding channel 313, the cooling oil in the second guiding channel 313 may be ejected from the first guiding channel with a smaller area, and at this time, the oil pressure of the cooling oil may be increased, so that the flow rate of the cooling oil may be increased to improve the cooling efficiency for the stator winding 310, and in addition, the injection may be realized more intensively through the pilot oil injection hole 30a of the first guiding channel, so that the cooling oil may be accurately ejected onto the stator winding 310, and the accuracy of the injection may be improved.

Alternatively, the cross-sectional area of the second guide passage 313 is equal to the cross-sectional area of the first guide passage, and the cross-sectional area of the second guide passage 313 is smaller than the cross-sectional area of the oil outlet end of the oil passage, while the cross-sectional area of the first guide passage may be smaller than the cross-sectional area of the oil inlet 11.

It is understood that the cross-sectional shapes of the second guide channel 313, the first guide channel and the third guide channel can be set according to actual needs. Such as circular, square, etc.

On the basis of the above embodiments, the oil-cooled motor 300 provided in the embodiments of the present specification further includes: a housing 320;

the first assembly 10 comprises a plurality of oil transportation stator punching sheets, a plurality of bulges 50 are arranged on the outer surface of each oil transportation stator punching sheet, oil passing grooves 13 penetrating through two opposite end surfaces of each oil transportation stator punching sheet are formed by adjacent bulges 50, a plurality of oil passing grooves 13 are distributed along the circumferential direction of each oil transportation stator punching sheet, the oil passing grooves 13 of two adjacent oil transportation stator punching sheets are communicated, and an oil way shunt is formed at the communicated position;

the outer diameters of the oil guide stator punching sheet 31 and the oil injection stator punching sheet 33 are not larger than the outer diameter of the oil delivery stator punching sheet and are in contact with the casing 320, so that an oil outlet channel is formed by the outer surface of the oil delivery stator punching sheet, the protrusion 50 and the casing 320.

The utility model discloses an embodiment, combine as shown in fig. 7, the surface of oil transportation stator punching sheet is formed with a plurality of archs 50, a plurality of archs 50 set up along the circumference interval of oil transportation stator punching sheet, the internal surface of two adjacent archs 50 and casing 320 and the surface of oil transportation stator punching sheet enclose and close and form the oil duct, the projection of the protruding 50 of adjacent oil transportation stator punching sheet at stator core 100's axial direction does not coincide to make the oil duct intercommunication of two adjacent oil transportation stator punching sheets and form the oil circuit at the intercommunication department and shunt.

In this embodiment, the projections 50 of the oil transportation stator punching sheets in the axial direction of the stator core 100 are not overlapped, so that the oil passages of the adjacent oil transportation stator punching sheets are arranged in a staggered manner, and the projections of the oil passing grooves 13 of the two adjacent stator core 100 sections 10 in the axial direction of the stator core 100 are overlapped, exemplarily, in a segmented rotation mode, the projections of the two oil passing grooves 13 in the axial direction of the stator core 100 are half overlapped, so that when cooling oil flows out from the oil passing groove 13 of one of the oil transportation stator punching sheets, the cooling oil is divided into two paths of oil which respectively flow into the two oil passing grooves 13 of the adjacent oil transportation stator punching sheets, the contact area between the side groove wall of the oil transportation stator punching sheet protruding 50 in the axial direction and the cooling oil is increased, the cooling effect on the middle position of the stator core 100 in the direction is improved, meanwhile, the flow path of the oil on the stator core 100 portion is prolonged, the contact time between the stator core 100 and the oil is increased, and the cooling effect of the oil cooling of the stator core 100 is further improved.

It will be understood that the oil passing grooves 13 at both ends of the first assembly 10 are the oil outlet ends.

In an embodiment of the present invention, referring to fig. 1, fig. 2, fig. 4 and fig. 7, the stator core 100 further has a radial direction, the casing 320 has an oil inlet 330 opened on a peripheral wall thereof, the first assembly 10 includes a plurality of oil transportation stator laminations in an axial direction, each oil transportation stator lamination has a plurality of oil passing grooves 13 penetrating through opposite end surfaces thereof, the plurality of oil passing grooves 13 are distributed along a circumferential direction of the oil transportation stator lamination, the oil passing grooves 13 of two adjacent oil transportation stator laminations are communicated, the first assembly 10 at a middle portion of the stator core 100 in the axial direction thereof has an oil inlet 11, the oil inlet 11 is communicated with the oil inlet 330, and the oil passing groove 13 communicates with the guiding oil injection passage of the second assembly 30.

In this embodiment, it can be understood that the oil passing groove 13 referred to herein is the oil passing groove 13 located on one side of the oil inlet 330, the cooling oil enters from the oil inlet 330 of the casing 320 and directly flows through each oil passing groove 13 through the oil inlet 11, so that the liquid inlet area can be increased by providing the oil inlet 11 between the oil inlet 330 and the oil passing groove 13, and the area of the oil inlet 11 is larger than that of the oil passing groove 13, thereby improving the cooling efficiency and effect of the cooling oil on the stator core 100 in the oil-cooled motor 300.

In an embodiment of the present invention, as shown in fig. 1, fig. 2, fig. 4 and fig. 7, the oil inlet 330 coincides with the oil inlet 11 along the projection of the stator core 100 in the radial direction.

In this embodiment, the projection of the oil inlet 330 in the radial direction of the stator core 100 coincides with the oil inlet 11, so that when cooling oil enters the stator core 100, the cooling oil can enter the oil inlet 11 from the oil inlet 330 through the shortest path, and the cooling efficiency of the cooling oil on the stator core 100 is ensured.

The above is only the preferred embodiment of the present invention, and the patent scope of the present invention is not limited thereby, and all the equivalent structure changes made by the contents of the specification and the drawings or the direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An oil-cooled motor including a stator core and a stator winding, the stator winding being in contact with an inner wall of the stator core, and the stator winding having terminal portions protruding from end faces of both axial ends of the stator core, characterized in that:

the stator core comprises a first assembly and a second assembly, the first assembly and the second assembly are connected along the axial direction of the stator core, an oil duct is arranged on the outer surface of the first assembly, and the second assembly is provided with a plurality of guide oil injection channels communicated with oil outlet ends of the oil duct;

2. The oil-cooled motor of claim 1, wherein the second component comprises a plurality of oil-conducting stator laminations and an oil-injecting stator lamination;

3. The oil-cooled motor of claim 1, wherein the second component comprises an oil-guiding stator lamination and an oil-spraying stator lamination;

4. The oil-cooled motor of claim 1, wherein the cross-sectional area of the first guide passage is smaller than the cross-sectional area of the second guide passage;

or the cross sectional area of the first guide channel is not larger than that of the second guide channel, and the cross sectional area of the second guide channel is smaller than that of the oil outlet end of the oil passage connected with the second guide channel.

5. The oil-cooled motor of claim 1 or 4, wherein the pilot oil injection passage is further provided with a third pilot passage, an oil inlet end of the third pilot passage is communicated with an oil outlet end of the oil passage, and an oil outlet end of the third pilot passage is communicated with an oil inlet end of the second pilot passage;

6. The oil-cooled machine of claim 5, wherein the outer surface of the first assembly defines a plurality of oil passages, and the cross-sectional area of the third guide passage is greater than the cross-sectional area of the oil outlet end of a single oil passage.

7. The oil-cooled motor of claim 2 or 3, wherein the pilot oil injection channel is further provided with a third pilot channel, the third pilot channel is provided on the oil-guide stator punching sheet on a side of the second pilot channel away from the stator winding, and the oil outlet end of the oil passage is communicated with the oil inlet end of the second pilot channel through the third pilot channel.

8. The oil-cooled motor of claim 2 or 3, wherein the second assembly further comprises an oil-passing stator lamination, the oil-passing stator lamination is arranged between the first assembly and the oil-guiding stator lamination, the oil-guiding injection channel is further provided with a third guiding channel, and the third guiding channel is arranged on the oil-passing stator lamination.

9. The oil-cooled motor of claim 1, wherein a projection of the first guide passage in an axial direction of the stator core falls on a connecting line of a linear portion and a rotary portion of the stator winding.

10. An oil-cooled electric machine as claimed in claim 2 or 3, further comprising: a housing;

the first assembly comprises a plurality of oil transportation stator punching sheets, a plurality of bulges are arranged on the outer surface of each oil transportation stator punching sheet, oil passing grooves penetrating through two opposite end surfaces of each oil transportation stator punching sheet are formed by adjacent bulges, a plurality of oil passing grooves are distributed along the circumferential direction of each oil transportation stator punching sheet, the oil passing grooves of two adjacent oil transportation stator punching sheets are communicated, and an oil way shunt is formed at the communicated position;