An oil-cooled motor

Abstract

The present invention provides an oil-cooled motor, wherein the stator includes a first stator punching, a second stator punching, and a third stator punching. The second stator punching is provided at both ends of the first stator punching, and the third stator punching is provided at both ends of the second stator punching. Several first stator punchings are stacked to form connecting grooves on the first stator punchings. Several second stator punchings and third stator punchings are stacked to form a first axial cooling channel and a second axial cooling channel within the stator. One end of the first cooling channel is connected to the winding and the other end is connected to the connecting groove. One end of the second cooling channel is connected to the oil ring and the other end is connected to the oil inlet channel. Cooling oil enters the second cooling channel from the oil ring, then enters the connecting groove and then enters the first cooling channel, thereby cooling the interior of the stator and the stator windings at both ends of the stator.

Description

Technical Field

[0001] The present invention relates to the technical field of oil-cooled motors, and in particular to an oil-cooled motor Background Art

[0002] Motors generate losses during operation, which are mainly divided into mechanical losses and electrical losses. Electrical losses are further divided into stator losses and rotor losses. Stator losses include stator core losses and winding losses, and the main cause of these losses is motor overheating.

[0003] When the bridge motor operates continuously at high torque, iron loss increases, as it is proportional to the square of the magnetic flux density, leading to core overheating. This increased magnetic flux, in turn, increases the magnetic current component, increasing copper loss in the stator winding and causing the winding to overheat. If the heating components exceed the allowable temperature, the motor may fail or even burn out. Summary of the Invention

[0004] In order to overcome the above technical defects, the object of the present invention is to provide an oil-cooled motor that can cool the interior of the stator and the windings at both ends of the stator.

[0005] The present invention discloses an oil-cooled motor, comprising a stator, wherein the stator comprises a first stator punching sheet, a second stator punching sheet, and a third stator punching sheet, wherein the third stator punching sheet is arranged at both ends of the first stator punching sheet, and the second stator punching sheet is arranged between the first stator punching sheet and the third stator punching sheet;

[0006] The first stator punching sheet is provided with radial communication holes, and a plurality of the communication holes are arranged along the circumferential direction of the first stator punching sheet; a plurality of the first stator punching sheets are stacked to form an axial communication groove inside the stator;

[0007] The second stator punching is provided with a plurality of first and second holes arranged in an annular manner, and the second holes are provided on the outer ring of the stator relative to the first holes; the first holes correspond axially to the positions of the windings at both ends of the stator and the communicating grooves; the second holes correspond axially to the positions of the oil rings at both ends of the stator and the communicating grooves; a plurality of the second stator punchings are stacked to form a first and second axial cooling channel inside the stator; one end of the first cooling channel corresponds to the winding, and the other end communicates with the communicating grooves; one end of the second cooling channel corresponds to the oil rings at both ends of the stator, and the other end communicates with the communicating grooves;

[0008] The third stator punching sheet is provided with a plurality of annularly arranged third holes, the third holes corresponding to the positions of the first holes; a plurality of the third stator punching sheets are stacked to extend the first cooling channel to the windings at both ends of the stator; the third stator punching sheet is also provided with arcuate grooves, a plurality of the arcuate grooves form a non-closed annular oil guide groove on the third stator punching sheet, the oil guide groove corresponding to the positions of the second holes; a plurality of the third stator punching sheets are stacked to extend the second cooling channel to the oil rings at both ends of the stator;

[0009] The oil ring is provided with a notch, and the notch is connected to each of the arc-shaped grooves;

[0010] The cooling oil in the oil ring flows into the oil guide groove through the notch, and the cooling oil in the arc groove flows to the connecting groove through the second cooling channel, then enters the first cooling channel from the connecting groove, and finally enters the windings at both ends of the stator.

[0011] Preferably, the gap is an annular gap.

[0012] Preferably, the notch is arc-shaped; a plurality of the notches are provided on the oil ring, and each of the arc-shaped grooves on the third stator punch is connected to at least one of the notches on the oil ring.

[0013] Preferably, the arc groove includes a first arc groove and a second arc groove, and the first arc groove and the second arc groove are staggered; the first arc groove is an arc-shaped through groove, and the second arc groove includes a plurality of fourth holes, and the positions of the fourth holes correspond to the positions of the second holes; the notch covers all the fourth holes of the second arc groove, and is connected to at least one of the first arc grooves at both ends of the second arc groove, so that all the arc grooves are connected to the notch.

[0014] Preferably, the proportion of the second arc-shaped groove in the oil guiding groove is greater than the proportion of the first arc-shaped groove in the oil guiding groove.

[0015] Preferably, an axial oil inlet channel is provided on the housing, and the oil inlet channel is connected to the gaps of the oil rings at both ends of the stator; an oil inlet port is provided on the oil inlet channel, and cooling oil enters the oil inlet channel from the oil inlet port and then enters the gaps of the oil rings at both ends respectively.

[0016] Preferably, the inner surface of the shell is provided with a plurality of annular oil channels and a plurality of axial oil channels, and the end of the communicating hole away from the axis of the stator radially extends to the edge of the stator and is connected with the annular oil channel and / or the axial oil channel; the cooling oil in the communicating groove flows into the annular oil channel and / or the axial oil channel to cool the outer surface of the stator.

[0017] Preferably, an axial oil outlet channel is further provided at the bottom of the housing, and the oil outlet channel is communicated with the notches of the oil rings at both ends of the stator; and an oil outlet is provided on the oil outlet channel.

[0018] Preferably, one end of the communicating groove facing the axis of the stator extends radially into the teeth of the stator.

[0019] Compared with the existing technology, the above technical solution has the following beneficial effects:

[0020] 1. The stator of the present invention is formed by stacking stator punching sheets. Only the structural design of a single stator punching sheet is required. The required oil passage can be formed on the stator after stamping, thus avoiding the complexity of machining the entire stator.

[0021] 2. The stator of the present invention only requires the combination of three stators with different structures to form the required oil channels on the stamped stator;

[0022] 3. The stator of the present invention can cool the interior of the stator through the first cooling channel and the second cooling channel, spray oil to cool the windings at both ends of the stator through the first stator oil channel, and flow oil through the first cooling channel to the oil rings at both ends of the stator to cool both ends of the stator. In addition, by providing the annular oil channel and the axial oil channel on the inner surface of the housing to cool the stator surface, the entire stator structure is cooled, thereby achieving excellent cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic structural diagram of the first stator punching sheet provided by the present invention;

[0024] Figure 2 A schematic structural diagram of the second stator punching sheet provided by the present invention;

[0025] Figure 3 A schematic structural diagram of the third stator punching sheet provided by the present invention;

[0026] Figure 4 A schematic diagram of the three-dimensional structure of the oil ring provided by the present invention;

[0027] Figure 5 A schematic structural diagram of a radial cross section of the oil ring provided by the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of the oil ring provided by the present invention after being matched with the third stator punching sheet;

[0029] Figure 7 A schematic diagram of the structure of the oil channel in the stator provided by the present invention;

[0030] Figure 8 A schematic structural diagram of the annular oil passage and the axial oil passage on the housing provided by the present invention;

[0031] Figure 9 A schematic diagram of the oil circuit of the axial cross section of the stator provided by the present invention;

[0032] Figure 10 A schematic diagram of the oil circuit of the axial cross section of the stator provided by the present invention;

[0033] Figure 11 This is a schematic diagram of the oil circuit of the radial cross section of the stator provided by the present invention.

[0034] Among them: 1-, first stator punching sheet, 101-connecting hole, 2-second stator punching sheet, 201-first hole, 202-second hole, 3-third stator punching sheet, 301-third hole, 302-first arc groove, 303-fourth hole, 4-oil ring, 401-notch, 5-connecting groove, 6-first cooling channel, 7-second cooling channel, 8-housing, 9-oil inlet channel, 10-oil outlet channel, 11-winding. DETAILED DESCRIPTION

[0035] The advantages of the present invention are further described below with reference to the accompanying drawings and specific embodiments.

[0036] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0037] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0038] It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining."

[0039] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0040] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal communication between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0041] In the following description, the suffixes such as "module", "component" or "unit" used to represent elements are only used to facilitate the description of the present invention and have no specific meaning. Therefore, "module" and "component" can be used interchangeably.

[0042] See attached Figure 1-11 The present invention discloses an oil-cooled motor, the stator of which is stamped from a plurality of stator punching sheets. The present invention forms the required oil passages on the stamped stator by stacking three stator punching sheets with different structures. Specifically, the stator includes a first stator punching sheet 1, a second stator punching sheet 2, and a third stator punching sheet 3. The second stator punching sheet 2 is provided at both ends of the first stator punching sheet 1, and the third stator punching sheet 3 is provided at both ends of the second stator punching sheet 2, that is, the second stator punching sheet 2 is provided between the first stator punching sheet 1 and the third stator punching sheet 3. It can be understood that the first stator punching sheet 1 is the middle part of the stator, and the third stator punching sheet 3 is the part at both ends of the stator.

[0043] The structures of the first stator punching sheet 1 , the second stator punching sheet 2 and the third stator punching sheet 3 are described below respectively, and the related cooling channels can be formed by combining the structures.

[0044] See attached Figure 1 The first stator sheet 1 is provided with a radial communication hole 101. Several first stator sheets 1 are stacked to form an axial communication slot 5 inside the stator. The communication slot 5 can be understood as a rectangular slot. The length / width of the rectangle is the radial feature of the communication slot 5 (i.e., the radial feature of the communication hole 101 of a single sheet), and the width / length of the rectangle is the axial feature of the communication slot 5 (i.e., the feature formed after the sheets are stacked).

[0045] See attached Figure 2 The second stator sheet 2 is provided with a plurality of annularly arranged first holes 201. The first holes 201 correspond axially to the windings 11 and the connecting slots 5 at both ends of the stator. The stacking of the plurality of second stator sheets 2 forms an axial first cooling channel 6 within the stator. One end of the first cooling channel 6 corresponds to the winding 11, and the other end communicates with the connecting slots 5.

[0046] The second stator punchings 2 are provided with a plurality of annularly arranged second holes 202, located on the outer ring of the stator relative to the first holes 201. The second holes 202 axially correspond to the oil rings 4 and the connecting grooves 5 at both ends of the stator. By stacking several second stator punchings 2, an axial second cooling channel 7 is formed within the stator. One end of the second cooling channel 7 corresponds to the oil rings 4 at both ends of the stator, and the other end communicates with the connecting grooves 5.

[0047] See attached Figure 3 The third stator punching sheet 3 is provided with a plurality of third holes 301 arranged in an annular pattern. The third holes 301 correspond to the positions of the first holes 201, that is, the positions of the windings 11 and the connecting slots 5 at both ends of the stator. Several third stator punching sheets 3 are stacked to extend the first cooling channel 6 to the windings 11 at both ends of the stator.

[0048] The third stator punching sheet 3 is also provided with an arc groove. Since the punching sheet of the annular groove does not exist (the inner circle part of the annular groove and the outer circle part of the punching sheet will be separated), the plurality of arc grooves form a non-closed annular oil guide groove on the third stator punching sheet 3. The non-closed can be understood as that the plurality of arc grooves are not connected.

[0049] The oil guide groove corresponds to the position of the second hole 202, that is, the oil ring 4 and the connecting groove 5 at both ends of the stator. Several third stator punchings 3 are superimposed to extend the second cooling channel 7 to the oil ring 4 at both ends of the stator.

[0050] At this point, an oil channel similar to the shape of an "I" can be obtained, that is, the connecting groove 5 forms a radial oil channel, and a first cooling channel 6 and a second cooling channel 7 are provided at both ends of the radial oil channel (because the second stator punching 2 and the third stator punching 3 are provided at both ends of the first stator punching 1), wherein the first cooling channel 6 leads to the windings 11 at both ends of the stator, and the second cooling channel 7 leads to the oil rings 4 at both ends of the stator.

[0051] The oil ring 4 is provided with a notch 401, which is connected to each arcuate groove. Since the arcuate grooves are not connected to each other, the notch 401 on the oil ring 4 is set to be connected to each arcuate groove, so that the cooling oil in the notch 401 can enter each arcuate groove and then enter each first cooling channel 6.

[0052] See attached Figure 7、 8 -11. The cooling oil in the oil ring 4 passes through the matching structure design of the notch 401 on the oil ring 4 and the oil guide groove on the third stator punch 3, so that the oil in the notch 401 fills the entire oil guide groove (depending on the structure of the third stator punch 3); then passes through the second cooling channel 7 (depending on the structure of the second stator punch 2) and enters the connecting groove 5 (depending on the structure of the first stator punch 1); in the connecting groove 5, it is introduced into the first cooling channel 6 (first through the first hole 201 of the second stator punch 2, and then through the third hole 301 of the third stator punch 3), and then sprayed toward the winding 11.

[0053] Several communication holes 101 are arranged along the circumferential direction of the first stator punching sheet 1, so that an annularly arranged communication groove 5 is formed inside the stator, which cooperates with the annularly arranged first holes 201 and third holes 301 to achieve circumferential cooling of the stator.

[0054] It can be understood that the stator's internal cooling includes two paths: one path is the first cooling channel 6, and the other path is the second cooling channel 7. They lead to different parts of the stator at both ends, cooling the oil ring 4 and winding 11 at both ends. The double-layer cooling path with different radial heights also provides better cooling for the stator interior.

[0055] Preferably, the gap 401 on the oil ring 4 is an annular gap 401 , through which the cooling oil in the gap 401 can fill the entire oil guide groove regardless of the structure of the oil guide groove on the third stator punching sheet 3 .

[0056] Another preferred embodiment is that the notch 401 on the oil ring 4 is arc-shaped, and a plurality of arc-shaped notches 401 are provided on the oil ring 4. Each arc-shaped groove on the third stator punching sheet 3 is connected to at least one notch 401 on the oil ring 4, so that the arc-shaped groove on the third stator punching sheet 3 can be filled with the cooling oil in the notch 401, thereby ensuring that the cooling oil can flow through the second cooling channel 7 and achieve uniform distribution of the stator circumference.

[0057] Furthermore, based on the fact that the notch 401 of the oil ring 4 is an arc-shaped notch 401, the arc-shaped slots of the third stator sheet 3 include a first arc-shaped slot 302 and a second arc-shaped slot, with the first arc-shaped slot 302 and the second arc-shaped slot being staggered. The first arc-shaped slot 302 is an arc-shaped through slot. It can be understood that the first arc-shaped slot 302 forms a circumferentially continuous arc-shaped channel after the stator sheets are stacked. The second arc-shaped slot includes a plurality of fourth holes 303, which correspond to the positions of the second holes 202. It can be understood that the second arc-shaped slot forms a plurality of circumferentially discontinuous axial channels after the stator sheets are stacked.

[0058] It can also be understood that due to the circumferential discontinuity of the second arc-shaped groove, the oil guide groove is a "non-closed annular oil guide groove".

[0059] It should be noted that the second arc-shaped groove should be understood as a “groove-like structure” composed of a plurality of fourth holes 303 , rather than a groove structure in the usual sense.

[0060] In this preferred embodiment, the notch 401 of the oil ring 4 covers all the fourth holes 303 of the second arcuate groove and is connected to at least one of the first arcuate grooves 302 at both ends of the second arcuate groove, so that all the arcuate grooves are connected to the notch 401.

[0061] For details, see the attached Figure 4-6 The oil ring 4 is provided with four arc-shaped notches 401 , each arc-shaped notch 401 covers a second arc-shaped groove and parts of the first arc-shaped groove 302 at both ends of the second arc-shaped groove, so that all the arc-shaped grooves on the third stator punching sheet 3 are connected with the notches 401 on the oil ring 4 .

[0062] In one case, the external cooling oil only enters the No. 1 notch 401 among the four notches 401 of the oil ring 4, and the cooling oil in the No. 1 notch 401 can enter all the fourth holes 303 of the No. 1 second arc groove corresponding to the No. 1 notch 401 on the third stator punching 3, and enter the No. 1 first arc groove 302 and the No. 2 first arc groove 302 at both ends of the No. 1 second arc groove; when the No. 1 first arc groove 302 and the No. 2 first arc groove 302 are filled, the cooling oil can enter the No. 1 first arc groove 302 and the No. 2 first arc groove 302 respectively on the oil ring 4 through the “part” of the No. 1 first arc groove 302 and the No. 2 first arc groove 302. No. 401 and No. 3 notch 401 (at this time, all the fourth holes 303 of the second arc groove No. 2 and the second arc groove No. 3 corresponding to the notch No. 2 401 and the notch No. 3 401 are also filled), and then enters the first arc groove No. 3 302 and the first arc groove No. 4 302 from the notch No. 2 401 and the notch No. 3 401, and then enters the No. 4 notch, thereby filling all the fourth holes 303 of the second arc groove No. 4 corresponding to the notch No. 401, and thus realizing the filling of the cooling oil in all the first arc grooves 302 and the second arc grooves of the oil guide groove.

[0063] In another case, if the external cooling oil enters more than two gaps 401 of the oil ring 4 at the same time, it is easier to fill all the first arc grooves 302 and the second arc grooves of the oil guide groove. The flow path is the same as above and will not be repeated here.

[0064] Preferably, the proportion of the second arc-shaped groove to the oil guide groove is greater than the proportion of the first arc-shaped groove 302 to the oil guide groove, thereby making the structure of the third stator punching sheet 3 more stable.

[0065] Preferably, an axial oil inlet passage 9 is provided on the housing 8, and the oil inlet passage 9 is connected to the notches 401 of the oil rings 4 at both ends of the stator. The oil inlet passage 9 is provided with an oil inlet port, and the cooling oil enters the oil inlet passage 9 from the oil inlet port and then enters the notches 401 of the oil rings 4 at both ends.

[0066] See attached Figure 8 Preferably, the axial oil inlet channel 9 is provided on the surface of the housing 8 .

[0067] Better, see attached Figure 8 The inner surface of the housing 8 is provided with a plurality of annular oil channels and a plurality of axial oil channels. The end of the communicating hole 101 away from the axis of the stator radially extends to the edge of the stator and is connected with the annular oil channel and / or the axial oil channel, so that the cooling oil in the communicating groove 5 can flow into the annular oil channel and / or the axial oil channel to cool the outer surface of the stator.

[0068] Preferably, an axial oil outlet channel 10 is also provided at the bottom of the surface of the shell 8. The oil outlet channel 10 is connected to the notch 401 of the oil ring 4 at both ends of the stator. An oil outlet is provided on the oil outlet channel 10. The cooling oil can flow from the oil ring 4 into the oil outlet channel 10 due to gravity and finally flow out from the oil outlet.

[0069] Preferably, one end of the communication slot 5 facing the stator axis extends radially into the stator teeth, increasing the radial dimension of the communication slot 5 so as to achieve more thorough cooling of the interior of the stator.

[0070] In a preferred embodiment, the first stator punching sheet 1 is arranged in the middle of the stator, so that the cooling oil is distributed more evenly. Of course, in other embodiments, the first stator punching sheet 1 can also be arranged in the middle of the stator.

[0071] Furthermore, multiple second stator punching sheet groups can be set up, that is, several first stator punching sheets form a first stator punching sheet group, several second stator punching sheets form a second stator punching sheet group, and several third stator punching sheets form a third stator punching sheet group. The first stator punching sheet group and the second stator punching sheet group are staggered and superimposed on each other, but the third stator punching sheets 3 are always maintained at both ends of the stator.

[0072] Preferably, the number of the first stator punching sheets 1 is 10-20, preferably 15. Similarly, the number of the third stator punching sheets 3 is 10-20, preferably 15.

[0073] It should be noted that the embodiments of the present invention have better practicability and do not impose any form of limitation on the present invention. Any technician familiar with the field may use the technical content disclosed above to change or modify it into an equivalent effective embodiment. However, any modification or equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An oil-cooled motor, characterized in that: The stator comprises a first stator punching sheet, a second stator punching sheet and a third stator punching sheet, wherein the third stator punching sheet is provided at both ends of the first stator punching sheet, and the second stator punching sheet is provided between the first stator punching sheet and the third stator punching sheet; The first stator punching sheet is provided with radial communication holes, and a plurality of the communication holes are arranged along the circumferential direction of the first stator punching sheet; a plurality of the first stator punching sheets are stacked to form an axial communication groove inside the stator; The second stator punching sheet is provided with a plurality of first holes and second holes arranged in an annular pattern, wherein the second holes are provided on the outer ring of the stator relative to the first holes; the first holes correspond axially to the positions of the windings at both ends of the stator and the communicating grooves; the second holes correspond axially to the positions of the oil rings at both ends of the stator and the communicating grooves; A plurality of second stator punchings are stacked to form a first axial cooling channel and a second axial cooling channel inside the stator; one end of the first cooling channel corresponds to the winding, and the other end is connected to the communication groove; one end of the second cooling channel corresponds to the oil rings at both ends of the stator, and the other end is connected to the communication groove; The first cooling channel and the second cooling channel are independent of each other in the axial direction, and the first cooling channel and the second cooling channel are connected to the annular oil channel and the axial oil channel so that the coolant cools the stator winding, the stator core and the oil ring; The third stator punching sheet is provided with a plurality of third holes arranged in an annular pattern, and the positions of the third holes correspond to the positions of the first holes; a plurality of the third stator punching sheets are stacked to extend the first cooling channel to the windings at both ends of the stator; The third stator punching sheet is further provided with an arcuate groove, and a plurality of the arcuate grooves form a non-closed annular oil guide groove on the third stator punching sheet, and the oil guide groove corresponds to the position of the second hole; a plurality of the third stator punching sheets are stacked to extend the second cooling channel to the oil rings at both ends of the stator; The oil ring is provided with a notch, and the notch is connected to each of the arc-shaped grooves; The notch is arc-shaped; a plurality of notches are provided on the oil ring, and each of the arc-shaped grooves on the third stator punch is connected to at least one notch on the oil ring; The cooling oil in the oil ring flows into the oil guide groove through the notch, and the cooling oil in the arc-shaped groove flows to the connecting groove through the second cooling channel, then enters the first cooling channel from the connecting groove, and finally enters the windings at both ends of the stator; The oil-cooled motor further comprises a housing, wherein an axial oil inlet passage is provided on the housing, and the oil inlet passage is communicated with the notches of the oil rings at both ends of the stator; The oil inlet channel is provided with an oil inlet, and the cooling oil enters the oil inlet channel from the oil inlet and then enters the notches of the oil rings at both ends respectively; The inner surface of the housing is provided with a plurality of annular oil passages and a plurality of axial oil passages. The end of the communication hole away from the axis of the stator radially extends to the edge of the stator and is in communication with the annular oil passages and / or the axial oil passages. The cooling oil in the communication groove flows into the annular oil passages and / or the axial oil passages to cool the outer surface of the stator. An axial oil outlet channel is further provided at the bottom of the housing, and the oil outlet channel is communicated with the notches of the oil rings at both ends of the stator; an oil outlet is provided on the oil outlet channel.

2. The oil-cooled motor according to claim 1, characterized in that: The gap is an annular gap.

3. The oil-cooled motor according to claim 1, characterized in that: The arc-shaped groove includes a first arc-shaped groove and a second arc-shaped groove, and the first arc-shaped groove and the second arc-shaped groove are staggered; The first arc-shaped groove is an arc-shaped through groove, and the second arc-shaped groove includes a plurality of fourth holes, and the positions of the fourth holes correspond to those of the second holes; The notch covers all the fourth holes of the second arc-shaped groove and is communicated with at least one of the first arc-shaped grooves at both ends of the second arc-shaped groove, so that all the arc-shaped grooves are communicated with the notch.

4. The oil-cooled motor according to claim 3, characterized in that: The proportion of the second arc-shaped groove to the oil guiding groove is greater than the proportion of the first arc-shaped groove to the oil guiding groove.

5. The oil-cooled motor according to claim 1, characterized in that: One end of the communicating groove facing the axis of the stator radially extends into the teeth of the stator.

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