Oil-cooled motor
A simplified oil-cooled electric motor design with ring-shaped channels addresses manufacturing complexity and cost issues by enabling direct contact cooling, achieving efficient heat dissipation and cost reduction.
Patent Information
- Application Number
- CN202422125353.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-29
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-08-29
AI Technical Summary
The oil channel structure of existing oil-cooled motors is complex, has inconvenient processing and high cost, making it difficult to effectively solve the problem of excessive motor temperature.
An oil-cooled motor is designed, using the grooves of the inner wall of the shell to form the first annular oil passage, and a second annular oil passage is formed between the stator assembly and the shell. The stator core is equipped with an oil collection groove and an axial oil passage. Combined with the oil injection ring and the oil pan, the effective distribution and spraying of coolant is achieved, and the direct contact with the stator assembly for cooling is achieved.
A simple processing technology is realized, reducing costs, and at the same time, through axial and radial cooling, the heat from the stator core and winding is quickly and efficiently removed, avoiding the increase in motor length and coolant accumulation.
Smart Images
Figure CN223109834U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of motors, and particularly to an oil-cooled motor. Background Art
[0002] Pure electric vehicles need heat dissipation. If the motor temperature is too high, the ECU will limit the power input, and in severe cases, there is even a risk of "demagnetization". Therefore, how to effectively dissipate heat from the drive motor has become a crucial problem.
[0003] At present, the motors on the market are mainly divided into oil-cooled motors and water-cooled motors. The water-cooled motor is processed with a water jacket in the casing, and the heat generated by the motor is indirectly cooled through the heat transfer between the stator core and the casing. Therefore, cooling oil can be used instead of the coolant (generally water glycol). Because the oil has good compatibility and insulation, it can directly contact heat sources such as the winding core inside the motor without problems such as electric breakdown, insulation reduction, and ablation.
[0004] However, in order to directly cool the oil-cooled motor, it is often necessary to open relatively complex oil channels on the stator and the casing, which makes the processing inconvenient and costly. Therefore, it is urgent to design an oil-cooled motor with a simple oil channel structure and low cost. Summary of the Utility Model
[0005] The utility model aims at the technical problems existing in the prior art and provides an oil-cooled motor.
[0006] The technical solution for the utility model to solve the above technical problems is as follows: An oil-cooled motor includes
[0007] A casing, on the inner wall of which a groove is opened;
[0008] A stator assembly, which is arranged in the casing and abuts against it. The space formed between the outer surface of the stator assembly along the circumferential direction and the groove is the first annular oil channel;
[0009] Two oil injection rings, which are symmetrically arranged coaxially at both ends of the stator assembly in the axial direction. The space formed between the oil injection ring and the inner wall of the casing is the second annular oil channel, which is used to collect the coolant flowing from the stator assembly and spray it on the windings of the stator assembly.
[0010] As a further technical solution, the first annular oil channel is arranged between the casing and the stator core of the stator assembly;
[0011] The surface of the stator core is provided with a plurality of oil collecting grooves, and adjacent oil collecting grooves are separated by a raised portion, and each of the raised portions is provided with a plurality of axial oil passages arranged at intervals along the axial direction of the stator core, and the adjacent axial oil passages arranged along the axial direction of the stator core are connected to the oil collecting grooves, so that the coolant from the first annular oil passage passes through the oil collecting grooves and the axial oil passages connected at the lower part thereof and then flows to the axial ends of the stator core;
[0012] Wherein, the first annular oil channel and the stator core share a radial centerline.
[0013] As a further technical solution, a third annular oil passage is opened on the stator core in a radial direction thereof, and the third annular oil passage is communicated with the first annular oil passage, so that the coolant from the first annular oil passage is diverted to the third annular oil passage and then moves to the stator slot on the stator core;
[0014] The third annular oil passage is opened between the protrusion and the oil collecting groove adjacent to each other in the axial direction of the stator core, and shares a radial center line with the first annular oil passage;
[0015] The stator slots are connected along the axial direction of the stator core, so that the coolant flows through the windings at both ends of the stator assembly and then converges to the oil collecting port of the oil injection ring.
[0016] As a further technical solution, the oil injection ring includes an oil collecting portion and a connecting portion connected to the oil collecting portion, the oil collecting portion abuts against the side wall of the stator core in the axial direction, and one end of the connecting portion away from the oil collecting portion is connected to the housing;
[0017] The oil collecting part and the connecting part are both annular structures coaxial with the stator core, and the outer diameter of the oil collecting part is smaller than the outer diameter of the stator core and larger than the outer diameter of the stator winding. The outer diameter of the connecting part is larger than the outer diameter of the oil collecting part, so that the space formed between the oil collecting part and the shell is the second annular oil channel. After the axial coolant from the surface of the stator core is collected in the second annular oil channel, it is sprayed onto the winding of the stator assembly through the oil spray holes on the oil collecting part.
[0018] As a further technical solution, an oil pan with an oil collecting chamber is provided on the outer surface of the shell, and the oil collecting port is communicated with the oil collecting chamber.
[0019] As a further technical solution, the oil pan is arranged along the axis direction of the housing, and its length is the same as the length along the axis direction of the housing.
[0020] As a further technical solution, it also includes a front end cover and a rear end cover respectively arranged at the two ends of the shell axis.
[0021] As a further technical solution, it further includes a rotor assembly, and the rotor assembly is sleeved in the stator assembly, so that the rotor assembly, the stator assembly, and the housing are coaxially sleeved in sequence from inside to outside.
[0022] The beneficial effects of the present utility model are as follows:
[0023] 1. The provided first annular oil passage and second annular oil passage have simple processes, do not require casting or opening holes, and are convenient for processing;
[0024] 2. The design of the first annular oil passage enables the coolant to directly contact the stator core, effectively taking away the heat of the stator core to achieve the purpose of cooling;
[0025] 3. The structural design of the second annular oil passage formed by the oil injection ring and the housing can, on the one hand, cool the windings extending from both ends of the axis of the stator core, and on the other hand, can collect the coolant to the oil collecting port of the oil injection ring and then move to the oil inlet of the oil sump, eliminating the need for the motor to additionally open an oil inlet for the oil sump, thereby avoiding an increase in the axial length of the motor. In addition, it can also avoid the accumulation of coolant at the stator core;
[0026] 4. The structural design of the third annular oil passage and the stator slots enables cooling in the axial direction of the stator assembly while also enabling cooling in the radial direction, thereby achieving simultaneous axial and radial cooling to achieve the purpose of rapid cooling;
[0027] 5. The structural design of the oil collecting groove, the protrusion, and the axial oil passage on the upper surface of the stator core of the stator assembly avoids the problem that the mating contact area between the stator core with a fully open slot oil passage structure and the housing in the existing design is too small, resulting in insufficient interference force. Description of the Drawings
[0028] Figure 1 is a three-dimensional structural schematic diagram of an oil-cooled motor of the present utility model;
[0029] Figure 2 is a three-dimensional structural schematic diagram of an oil-cooled motor of the present utility model after removing the front and rear end covers;
[0030] Figure 3 is a three-dimensional structural schematic diagram of an oil-cooled motor of the present utility model radially sectioned after removing at least the front end cover;
[0031] Figure 4 is Figure 3 a three-dimensional structural schematic diagram of another perspective in
[0032] Figure 5 after removing at least the rotor assembly; Figure 3 is a three-dimensional structural schematic diagram of another perspective in
[0033] Figure 6 It is a partially enlarged structural schematic diagram after longitudinal sectioning after the housing is connected to the fuel injection ring and the stator assembly;
[0034] Figure 7 It is a partially three-dimensional structural schematic diagram after radial sectioning after the stator assembly is connected to the fuel injection ring;
[0035] Figure 8 It is a partially enlarged structural schematic diagram after radial sectioning of the stator assembly;
[0036] Figure 9 It is a magnified structural schematic diagram of the surface of the stator core. Among them, letters such as A1, B1... on the figure are used to illustrate the structure;
[0037] Figure 10 、 Figure 11 Fuel injection rings with oil collecting ports opened at different positions respectively;
[0038] In the attached drawings, the list of components represented by each reference numeral is as follows:
[0039] Housing 1, groove 11;
[0040] Stator assembly 2, stator winding 21, stator core 22, oil collecting groove 221, protrusion 222, axial oil passage 223, stator slot 224;
[0041] First annular oil passage 3;
[0042] Fuel injection ring 4, oil collecting port 41, oil collecting part 42, fuel injection hole 421, dividing strip 422, connecting part 43;
[0043] Second annular oil passage 5, front end cover 6, rear end cover 61, rotor assembly 7, third annular oil passage 8;
[0044] Oil sump 9, oil collecting chamber 91, oil outlet 92. Detailed implementation manners
[0045] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application.
[0046] In the description of the present application, the terms "first" and "second" are used only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.
[0047] In the description of the present application, the term "for example" is used to mean "serving as an example, illustration, or explanation". Any embodiment described as "for example" in the present application is not necessarily construed as being more preferred or having more advantages than other embodiments. In order for any person skilled in the art to implement and use the present utility model, the following description is given. In the following description, details are set forth for purposes of explanation. It should be understood that those of ordinary skill in the art can recognize that the present utility model can also be implemented without using these specific details. In other instances, well-known structures and processes are not elaborated in detail to avoid obscuring the description of the present utility model with unnecessary details. Therefore, the present utility model is not intended to be limited to the illustrated embodiments, but rather to be in line with the broadest scope consistent with the principles and features disclosed in the present application.
[0048] This embodiment provides an oil-cooled motor that is convenient to process, has low cost, and has a simple structure. Refer to Figures 1 - 5 , and specifically includes a housing 1, on the inner wall of which a groove 11 is provided; a stator assembly 2, disposed inside the housing 1 and in contact therewith, and the space formed between the outer surface of the stator assembly 2 in the circumferential direction and the groove 11 is a first annular oil passage 3; two spray rings 4, symmetrically arranged coaxially at both ends of the stator assembly 2 in the axial direction, and the space formed between the spray ring 4 and the inner wall of the housing 1 is a second annular oil passage 5, which is used to collect the coolant flowing from the stator assembly 2 and then spray it onto the windings 21 of the stator assembly 2 to take away the temperature on the windings 21.
[0049] In the specific implementation process, refer to Figure 4 , Figure 5 , Figure 7 , the stator assembly 2 includes a stator core 22 and a stator winding 21 nested inside the stator core 22. The coolant enters the first annular oil passage 3 through the oil inlet on the housing 1 to reduce the heat of the stator assembly 2;
[0050] This embodiment further includes a front end cover 6 and a rear end cover 61 respectively disposed at both ends of the axis of the housing 1 (refer to Figures 1 - 3), to seal the stator assembly 2 inside the housing 1. It should be noted that the front end cover 6 and the rear end cover are both fixedly connected to the housing 1 by screws; specifically, it further includes a rotor assembly 7, and the rotor assembly 7 is sleeved in the stator assembly 2, so that the rotor assembly 7, the stator assembly 2, and the housing 1 are coaxially sleeved in sequence from inside to outside and are sealed by the front end cover 6 and the rear end cover 61.
[0051] In the specific implementation process, refer to Figures 3 - 5 , the first annular oil passage 3 is arranged between the housing 1 and the stator core 22 of the stator assembly 2; a plurality of oil collecting grooves 221 are formed on the surface of the stator core 22, and adjacent oil collecting grooves 221 are separated by a convex portion 222. A plurality of axially spaced axial oil passages 223 are formed on each convex portion 222 along the axial direction of the stator core 22. The axially adjacent axial oil passages 223 and the oil collecting grooves 221 are communicated, so that the coolant from the first annular oil passage 3 is shunted to both axial ends of the stator core 22 after passing through the connected oil collecting grooves 221 and axial oil passages 223 below it; wherein, the first annular oil passage 3 and the stator core 22 share the same radial center line.
[0052] Specifically, refer to Figure 8 , Figure 9, the stator core 22 is welded into a cylindrical structure by a plurality of stator laminations, and at least two sets of oil channels formed by oil collecting grooves 221 and protruding portions 222 arranged at intervals are provided on each stator lamination along its axial direction. Each set of oil channels is arranged adjacent to each other, and the protruding portions 222 and oil collecting grooves 221 in the adjacent oil channels along the radial direction of the stator core 22 are arranged at intervals. For example, on one stator lamination, the first set of oil channels along the axial direction of the stator core 22 is composed of an oil collecting groove A1, a protruding portion B1, an oil collecting groove A2, and a protruding portion B2 arranged in sequence. Then, another set of oil channels adjacent to it is composed of a protruding portion C1, an oil collecting groove D1, a protruding portion C2, and an oil collecting groove D2 arranged in sequence. At this time, along the radial direction of the stator core 22, the oil collecting groove A1 is adjacent to the protruding portion C1, the protruding portion B1 is adjacent to the oil collecting groove D1, the oil collecting groove A2 is adjacent to the protruding portion C2, and the protruding portion B2 is adjacent to the oil collecting groove D2. And the first annular oil channel is communicated with the adjacent oil collecting grooves 221 and protruding portions 222 in the circumferential direction of the stator core 22. For example, at this time, the groove 11 is opposite to the protruding portion B1 and the oil collecting groove A2. Similarly, since the first annular oil passage 3 is arranged in a radial ring along the stator assembly 2, therefore, the side where the oil collecting groove D1 is adjacent to the protruding portion C2 is also opposite to the groove 11 at the same time. By analogy, the space on each stator lamination of the stator assembly 2 opposite to the groove 11 constitutes the first annular oil passage 3. After the cooling oil enters the first annular oil passage 3, on the one hand, it flows through the axial oil passage 223 in the protruding portion 222 opposite to the first annular oil passage 3 and then flows to the oil collecting groove 221 axially adjacent to the protruding portion 222 until it moves to the second annular oil passage 5 and is sprayed onto the winding 21 of the stator assembly 2 through the spray ring 4. On the other hand, it flows through the oil collecting groove 221 opposite to the first annular oil passage 3 and then flows to the axial oil passage 223 in the protruding portion 222 axially adjacent to the oil collecting groove 221 until it moves to the second annular oil passage 5 and is sprayed onto the winding 21 of the stator assembly 2 through the spray ring 4.
[0053] In the specific implementation process, refer to Figure 8 , Figure 9The stator core 22 is provided with a third annular oil passage 8 along its radial direction, and the third annular oil passage 8 is communicated with the first annular oil passage 3, so that the coolant from the first annular oil passage 3 is diverted to the third annular oil passage 8 and then moves to the stator slot 224 on the stator core 22, further removing the heat on the stator core 22; wherein the third annular oil passage 8 is provided between the protrusion 222 and the oil collecting groove 221 adjacent to each other in the axial direction of the stator core 22 (i.e., between the two). A gap is provided between them), and the first annular oil passage 3 shares a radial centerline, thereby achieving simultaneous cooling of the stator core 22 in radial and axial directions; the stator slot 224 is connected along the axial direction of the stator core 22, so that the coolant passes through the windings 21 at both ends of the stator assembly 2 and then converges to the oil collecting port 41 of the oil injection ring 4, so that the coolant diverted to the third annular oil passage 8 takes away part of the heat of the stator core 22 and then takes away part of the heat on the stator winding 21, thereby achieving effective cooling.
[0054] For example, the gap between the protrusion B1 and the oil collecting groove A2, the gap between the oil collecting groove D1 and the protrusion C2, and so on, these gaps constitute the third annular oil channel 8; that is, the third annular oil channel 8 is opened along the circumferential direction of the stator core 22 and is perpendicular to the axis of the stator core 22.
[0055] In the specific implementation process, see Figures 3 - 7 , Figure 10 , Figure 11 The oil injection ring 4 includes an oil collecting portion 42 and a connecting portion 43 connected to the oil collecting portion 42, wherein the oil collecting portion 42 abuts against the axial side wall of the stator core 22, and the end of the connecting portion 43 away from the oil collecting portion 42 is connected to the housing 1; wherein the oil collecting portion 42 and the connecting portion 43 are both annular structures coaxial with the stator core 22, and the outer diameter of the oil collecting portion 42 is smaller than the outer diameter of the stator core 22 and larger than the outer diameter of the stator winding 21, and the outer diameter of the connecting portion 43 is larger than the outer diameter of the oil collecting portion 42, so that the space formed between the oil collecting portion 42 and the housing 1 is the second annular oil passage 5, and the coolant from the axial surface of the stator core 22 is collected in the second annular oil passage 5, and then sprayed onto the winding 21 of the stator assembly 2 through the oil injection hole 421 on the oil collecting portion 42.
[0056] Specifically, the oil collecting ports 41 on the two oil injection rings 4 may be arranged at different positions. For example, the oil collecting port 41 on one oil injection ring 4 is arranged on the oil collecting portion 42 (see Figure 11 ), and the width of the oil collecting port 41 is smaller than the axial width of the oil collecting portion 42, and shares the radial center line with the oil collecting portion 42; the oil collecting port 41 on the other oil injection ring 4 is arranged on the connecting portion 43 (see Figure 10), and the width of the oil collecting port 41 is greater than half of the axial width of the connecting portion 43, and is designed with a notch so that the edge of the connecting portion 43 is broken, that is, the connecting portion 43 with the oil collecting port 41 is C-shaped on the side away from the adjacent oil collecting portion 42 in the longitudinal section.
[0057] For example, in order to avoid the accumulation of coolant in the second annular oil passage 5 and uneven spraying, a plurality of dividing strips 422 are provided at equal intervals along the circumferential direction of the oil collecting portion 42 .
[0058] In the specific implementation process, see Figures 1 - 5 The outer surface of the housing 1 is provided with an oil pan 9 with an oil collecting chamber 91, and the oil collecting port 41 is communicated with the oil collecting chamber 91 to avoid oil collection and blockage.
[0059] Specifically, the oil pan 9 is arranged along the axis direction of the housing 1, and its length is the same as the length of the housing 1 in the axis direction, which further accelerates the flow of the coolant and avoids blockage. In order to make the structure light and easy to clean, the oil pan 9 is a frame-type structure with symmetrical openings at both ends (preferably openings at both ends along the axis direction of the stator assembly 2), and the openings are sealed by the front cover 6 and the rear cover 61 respectively. In order to facilitate the discharge of the coolant, the oil pan 9 is provided with an oil outlet 92 connected to the oil collecting chamber 91, for example, arranged on the side of the oil pan 9 away from the housing.
[0060] In this embodiment, the coolant is preferably cooling oil, such as water glycol.
[0061] The utility model is achieved in this way:
[0062] The coolant is input from the oil inlet of the housing 1 to enter the first annular oil passage 3. At this time, a part of the coolant entering the first annular oil passage 3 moves axially along the stator core 22 (i.e., the axial oil passage 223 and the oil collecting groove 221 in the raised portion 222). In this process, the axially moving coolant is simultaneously divided to both ends of the stator core 22, passes through the adjacent axial oil passages 223 and the oil collecting groove 221 until it moves to the second annular oil passage 5 (this process takes away a part of the heat on the surface of the stator core 22), and then sprayed onto the stator winding 21 on the stator core 22 through the oil injection hole 421 on the oil injection ring 4, so as to take away a part of the heat on the stator winding 21 and then collect into the oil collecting cavity 91 through the oil collecting opening 41;
[0063] Another part of the coolant moves in the direction perpendicular to the axis of the stator core 22 (i.e., moves into the third annular oil groove). During this process, part of the heat in the radial direction of the stator core 22 can be taken away. Then, it moves to the stator slot 224 to take away part of the heat in the axial direction inside the stator core 22. Finally, this part of the coolant is sprayed onto the stator winding 21 on the stator core 22 through the oil injection holes 421 on the oil injection ring 4. After taking away part of the heat on the stator winding 21, it is collected into the oil collecting cavity 91 through the oil collecting port 41.
[0064] The structural design of the oil-cooled motor in this embodiment is simple, with low cost, convenient operation, excellent cooling effect, and is suitable for popularization.
[0065] In the axial direction of the stator core 22 in this embodiment, a space is formed between the stator assembly 2, the oil injection ring 4, and the housing 1 to accommodate the coolant from the axial oil passage 223 and the oil injection holes 421.
[0066] It should be noted that in the above embodiments, the descriptions of each embodiment have their own focuses. For the parts not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0067] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications once they know the basic inventive concept. Therefore, the appended claims are intended to be construed as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.
[0068] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.
Claims
1. An oil-cooled motor, characterized in that, including a housing (1) with a groove (11) formed on its inner wall; a stator assembly (2) disposed within the housing (1) and in contact therewith, and a space formed between the outer surface of the stator assembly (2) in the circumferential direction and the groove (11) is a first annular oil passage (3); two oil injection rings (4) symmetrically arranged coaxially at both axial ends of the stator assembly (2), and a space formed between the oil injection ring (4) and the inner wall of the housing (1) is a second annular oil passage (5), which is used to collect the coolant flowing from the stator assembly (2) and then spray it onto the stator winding (21) of the stator assembly (2).
2. The oil-cooled motor according to claim 1, wherein, The first annular oil passage (3) is disposed between the housing (1) and the stator core (22) of the stator assembly (2); a plurality of oil collecting grooves (221) are formed on the surface of the stator core (22), and adjacent oil collecting grooves (221) are separated by a protrusion (222). A plurality of axially spaced axial oil passages (223) are formed on each protrusion (222) along the axial direction of the stator core (22). The axially adjacent axial oil passages (223) are communicated with the oil collecting grooves (221) along the axial direction of the stator core (22), so that the coolant from the first annular oil passage (3) is shunted to both axial ends of the stator core (22) through the oil collecting grooves (221) and the axial oil passages (223) communicated therewith at the lower part; wherein, the first annular oil passage (3) and the stator core (22) share the same radial center line.
3. The oil-cooled motor according to claim 2, characterized in that, a third annular oil passage (8) is formed on the stator core (22) along its radial direction, and the third annular oil passage (8) is communicated with the first annular oil passage (3), so that the coolant from the first annular oil passage (3) is shunted to the third annular oil passage (8) and then moves to the stator slots on the stator core (22); wherein, the third annular oil passage (8) is formed between the protrusion (222) and the oil collecting groove (221) adjacent in the axial direction of the stator core (22), and shares the same radial center line with the first annular oil passage (3); the stator slots penetrate along the axial direction of the stator core (22), so that the coolant converges to the oil collecting port (41) of the oil injection ring (4) after passing through the windings (21) at both ends of the stator assembly (2).
4. The oil-cooled motor according to claim 3, characterized in that, The oil injection ring (4) includes an oil collecting portion (42) and a connecting portion (43) connected to the oil collecting portion (42). The oil collecting portion (42) abuts against the side wall of the stator core (22) in the axial direction, and one end of the connecting portion (43) away from the oil collecting portion (42) is connected to the housing (1); Among them, the oil collecting part (42) and the connecting part (43) are both annular structures coaxial with the stator core (22). The outer diameter of the oil collecting part (42) is smaller than that of the stator core (22) and larger than that of the stator winding (21). The outer diameter of the connecting part (43) is larger than that of the oil collecting part (42), so that the space formed between the oil collecting part (42) and the housing (1) is the second annular oil passage (5). After the coolant axially flowing from the surface of the stator core (22) converges into the second annular oil passage (5), it is sprayed onto the winding (21) of the stator assembly (2) through the oil spraying holes (421) on the oil collecting part (42).
5. The oil-cooled motor according to claim 3, characterized in that, An oil pan (9) with an oil collecting cavity (91) is provided on the outer surface of the housing (1), and the oil collecting port (41) is communicated with the oil collecting cavity (91).
6. The oil-cooled motor according to claim 5, characterized in that, The oil pan (9) is arranged along the axis direction of the housing (1), and its length is the same as the length of the housing (1) in the axis direction.
7. The oil-cooled motor according to claim 1, characterized in that It further includes a front end cover (6) and a rear end cover (61) respectively arranged at both ends of the axis of the housing (1).
8. The oil-cooled motor according to claim 7, wherein, It further includes a rotor assembly (7). The rotor assembly (7) is sleeved in the stator assembly (2), so that the rotor assembly (7), the stator assembly (2), and the housing (1) are coaxially sleeved in sequence from the inside to the outside.