Oil-cooled motor for electric drive system

Abstract

The utility model provides an oil-cooled motor for an electric drive system, which comprises a shell, a stator core, a first oil injection ring and a second oil injection ring, and is characterized in that an oil guide groove is formed in the cavity wall surface of an accommodating cavity of the shell; the stator iron core is arranged in the containing cavity, stator windings are arranged at the two axial ends of the stator iron core, and the outer circumferential face of the stator iron core and the oil guide groove define an oil passing channel; the first oil injection ring and the second oil injection ring are arranged at the two axial ends of the stator iron core respectively. The oil passing channel extends in the axial direction of the shell, so that the two axial ends of the oil passing channel spray oil to the stator winding on the same side through the first oil spraying ring and spray oil to the stator winding on the same side through the second oil spraying ring respectively. According to the utility model, the problems of unreasonable arrangement of the electric drive system, uneven contact between the oil path and the heating part of the motor stator, poor heat dissipation effect, and increase of the overall weight of the electric drive system due to the fact that a through hole is axially formed in the stator iron core to realize circulation of cooling oil are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy vehicle technical field, specifically, relate to a kind of oil-cooled motor for electric drive system. BACKGROUND

[0002] With the development of the electric drive system of new energy vehicles, in order to meet the demand of the endurance mileage and power performance of new energy vehicles, the drive motor of the electric drive system is also advancing towards higher torque density and higher power density.

[0003] Compared with the existing water cooling method for cooling the drive motor, the oil cooling method cools the drive motor by directly contacting the heating parts of the drive motor. The heating parts of the drive motor, i.e. the motor rotor and stator, are immersed in cooling oil for cooling. The oil cooling method can more quickly and effectively remove the heat generated during the operation of the drive motor. The limit of the working efficiency of the drive motor is usually subject to its thermal limit capability. By using stronger heat dissipation technology, the power density and torque density of the drive motor can be improved under the same size, thereby improving its working performance and service life.

[0004] However, most of the existing oil-cooled electric shells of the electric drive system and the reducer power supply shells are integrally die-cast, which causes uneven contact between the oil circuit and the heating parts of the motor stator, resulting in poor heat dissipation effect. In addition, the oil passage for cooling the stator is realized by opening a through hole in the axial direction of the stator core to circulate the cooling oil, which increases the overall weight of the electric drive system. SUMMARY

[0005] The main purpose of the utility model is to provide an oil-cooled motor for electric drive system to solve the problem of unreasonable arrangement of the electric drive system in the prior art, which causes uneven contact between the oil circuit and the heating parts of the motor stator, resulting in poor heat dissipation effect, and opening a through hole in the axial direction of the stator core to circulate the cooling oil, which increases the overall weight of the electric drive system.

[0006] To achieve the above purpose, the utility model provides an oil-cooled motor for electric drive system, which comprises a shell, a stator core, a first oil injection ring and a second oil injection ring. The shell has a receiving cavity, and the cavity wall surface of the receiving cavity has a oil guide groove. The stator core is arranged in the receiving cavity, and the axial ends of the stator core are both provided with stator windings. The outer peripheral surface of the stator core and the oil guide groove form an oil passage. The first oil injection ring is arranged at the axial first end of the stator core and located at the outer peripheral side of the same side stator winding. The second oil injection ring is arranged at the axial second end of the stator core and located at the outer peripheral side of the same side stator winding. The oil passage extends in the axial direction of the shell, so that the axial ends of the oil passage respectively spray oil to the same side stator windings through the first oil injection ring and the second oil injection ring.

[0007] In one exemplary embodiment, there are multiple oil guide grooves, which are arranged circumferentially around the housing.

[0008] In one exemplary embodiment, there are multiple oil guide grooves, which are evenly distributed around the circumference of the housing.

[0009] In one exemplary embodiment, the outer peripheral surface of the stator core is interference-fitted with the cavity wall surface of the receiving cavity.

[0010] In an exemplary embodiment, the number of oil guide grooves N and the number of copper wire grooves in the stator core M satisfy the following relationship: N = 2M.

[0011] In an exemplary embodiment, the housing includes a casing, a first end cap, and a second end cap. The casing is a cylindrical structure with open ends, and the inner wall of the casing has an oil guide groove. The first end cap is disposed on the first axial end of the casing, such that the end surface of the first end cap facing the receiving cavity, the end surface of the stator core facing the first end cap, and a portion of the inner wall of the casing form a first mounting cavity, and a first oil injection ring is located in the first mounting cavity. The second end cap is disposed on the second axial end of the casing, such that the end surface of the second end cap facing the receiving cavity, the end surface of the stator core facing the second end cap, and a portion of the inner wall of the casing form a second mounting cavity, and a second oil injection ring is located in the second mounting cavity. The casing, the first end cap, and the second end cap form a receiving cavity. The first end cap has an oil inlet and an oil outlet. The oil inlet communicates with the oil guide groove, and both the first and second mounting cavities communicate with the oil outlet.

[0012] In one exemplary embodiment, the housing has an oil drain channel extending in the same direction as the axial direction of the receiving cavity. The first end of the oil drain channel is connected to the second mounting cavity, and the second end of the oil drain channel is connected to the oil outlet.

[0013] In one exemplary embodiment, at least the housing is a stretch extrusion molded structure.

[0014] In one exemplary embodiment, a sealing ring is provided between the inner circumferential surface of the first end cover and the outer circumferential surface of the first oil injection ring; and / or, a sealing ring is provided between the inner circumferential surface of the first end cover and the outer circumferential surface of the housing; and / or, a sealing ring is provided between the end surface of the first end cover facing the receiving cavity and the end surface of the stator core facing the first end cover.

[0015] In one exemplary embodiment, a sealing ring is provided between the inner circumferential surface of the second end cover and the outer circumferential surface of the second oil injection ring; and / or, a sealing ring is provided between the inner circumferential surface of the second end cover and the outer circumferential surface of the housing; and / or, a sealing ring is provided between the end surface of the second end cover facing the receiving cavity and the end surface of the stator core facing the second end cover.

[0016] This invention provides an oil-cooled motor for an electric drive system, comprising a housing, a stator core, a first oil injection ring, and a second oil injection ring. The housing has a receiving cavity with an oil guide groove on its wall surface. The stator core is disposed within the receiving cavity, and stator windings are provided at both axial ends of the stator core. The outer circumferential surface of the stator core and the oil guide groove form an oil passage. The first oil injection ring is disposed at the first axial end of the stator core, located on the outer circumferential side of the stator winding on the same side. The second oil injection ring is disposed at the second axial end of the stator core, also located on the outer circumferential side of the stator winding on the same side. The oil passage extends axially along the housing, such that oil is injected at both axial ends of the oil passage through the first oil injection ring to the stator winding on the same side, and through the second oil injection ring to the stator winding on the same side, respectively.

[0017] By having an oil guide groove on the cavity wall of the housing, after the stator core is placed in the housing, the outer circumferential surface of the stator core and the oil guide groove form an oil passage. The oil passage extends along the axial direction of the housing, so that the two ends of the oil passage spray oil to the stator winding on the same side through the first oil spray ring and the second oil spray ring, respectively. This ensures the reliability and uniformity of oil spraying to the stator winding, as well as the reliability of cooling the stator winding. Compared with the existing method of opening an oil groove on the outer circumferential surface of the stator core, it is not necessary to increase the diameter of the stator core, and the overall layout of the oil-cooled motor can be reduced in space. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0019] Figure 1 A cross-sectional view of an oil-cooled motor according to an optional embodiment of the present invention is shown.

[0020] Figure 2 It shows Figure 1 A schematic diagram of the housing structure of the oil-cooled motor in the diagram;

[0021] Figure 3 It shows Figure 2 A schematic diagram of the cross-sectional structure from the AA perspective;

[0022] Figure 4 It shows Figure 2 Another structural diagram of the casing;

[0023] Figure 5 It shows Figure 4 A magnified structural diagram of point B in the diagram.

[0024] The above figures include the following reference numerals:

[0025] 10. Housing; 11. Receiving cavity; 12. Oil guide groove; 13. Machine housing; 14. First end cover; 141. Oil inlet; 142. Oil outlet; 15. Second end cover; 16. Oil drain channel;

[0026] 20. Stator core; 21. Stator winding;

[0027] 30. First injection ring; 40. Second injection ring; 50. Sealing ring;

[0028] 100, First mounting cavity; 200, Second mounting cavity. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0030] To address the problems in existing electric drive systems, such as unreasonable settings leading to uneven contact between the oil circuit and the heat-generating parts of the motor stator, resulting in poor heat dissipation, and the increased overall weight of the electric drive system due to axial through-holes in the stator core for cooling oil circulation, this invention provides an oil-cooled motor for electric drive systems.

[0031] like Figures 1 to 5 As shown, an oil-cooled motor for an electric drive system includes a housing 10, a stator core 20, a first oil injection ring 30, and a second oil injection ring 40. The housing 10 has a receiving cavity 11, and the cavity wall of the receiving cavity 11 has an oil guide groove 12. The stator core 20 is disposed in the receiving cavity 11, and stator windings 21 are provided at both axial ends of the stator core 20. The outer peripheral surface of the stator core 20 and the oil guide groove 12 form an oil passage. The first oil injection ring 30 is disposed at the first axial end of the stator core 20 and is located on the outer peripheral side of the stator winding 21 on the same side. The second oil injection ring 40 is disposed at the second axial end of the stator core 20 and is located on the outer peripheral side of the stator winding 21 on the same side. The oil passage extends axially along the housing 10 so that the axial ends of the oil passage spray oil to the stator winding 21 on the same side through the first oil injection ring 30 and oil to the stator winding 21 on the same side through the second oil injection ring 40, respectively.

[0032] By having an oil guide groove 12 on the cavity wall of the receiving cavity 11 of the housing 10, after the stator core 20 is placed in the receiving cavity 11, the outer peripheral surface of the stator core 20 and the oil guide groove 12 form an oil passage. The oil passage extends along the axial direction of the housing 10, so that the two ends of the oil passage are respectively sprayed with oil to the stator winding 21 on the same side through the first oil spray ring 30 and the second oil spray ring 40. This ensures the reliability and uniformity of oil spraying to the stator winding 21, as well as the reliability of cooling the stator winding 21. Compared with the existing method of opening an oil groove on the outer peripheral surface of the stator core 20, it is not necessary to increase the diameter of the stator core 20, and the overall layout of the oil-cooled motor can be reduced in space.

[0033] It should be noted that in this application, there are multiple oil guide grooves 12, which are arranged at intervals around the circumference of the housing 10. In this way, by setting multiple oil guide grooves 12, it is ensured that the multiple oil guide grooves 12 guide the lubricating oil synchronously, so that the two ends of each oil guide groove 12 guide the oil to the first oil injection ring 30 and the second oil injection ring 40 on both sides, and then spray the oil through the oil injection hole on the circumferential outer surface of the first oil injection ring 30 to the stator winding 21 on the same side, and spray the oil through the oil injection ring on the circumferential outer surface of the second oil injection ring 40 to the stator winding 21 on the same side.

[0034] like Figure 2 As shown, there are multiple oil guide grooves 12, which are evenly distributed around the circumference of the housing 10. This ensures uniform oil spraying at the stator windings 21 on both sides, thereby ensuring that the service life of the two stator windings 21 on both sides can be as consistent as possible.

[0035] It should be noted that in this application, the outer peripheral surface of the stator core 20 is interference-fitted with the cavity wall of the receiving cavity 11. In this way, by setting the outer peripheral surface of the stator core 20 and the cavity wall of the receiving cavity 11 to an interference fit structure, the reliability of the connection between the stator core 20 and the housing 10 is ensured.

[0036] It should be noted that in this application, the number N of oil guide grooves 12 and the number M of copper wire grooves in the stator core 20 satisfy the following relationship: N = 2M. This ensures that when the oil guide grooves 12 guide oil to the stator winding 21, they can be distributed as evenly as possible at the coils in different copper wire grooves, thereby ensuring the reliability of cooling the stator winding 21.

[0037] It should be noted that, in an optional embodiment of this application, the number of oil guide grooves 12 is 96, and the number of copper wire grooves in the stator core 20 is 48.

[0038] like Figure 1As shown, the housing 10 includes a housing 13, a first end cover 14, and a second end cover 15. The housing 13 is a cylindrical structure with open ends, and the inner wall surface of the housing 13 has an oil guide groove 12. The first end cover 14 is installed on the axial first end of the housing 13, such that the end surface of the first end cover 14 facing the receiving cavity 11, the end surface of the stator core 20 facing the first end cover 14, and part of the inner wall surface of the housing 13 form a first mounting cavity 100, and the first oil injection ring 30 is located in the first mounting cavity 100. The second end cover 15 is installed on the housing 13. The second end is axially arranged so that the end surface of the second end cover 15 facing the receiving cavity 11, the end surface of the stator core 20 facing the second end cover 15, and part of the inner wall surface of the housing 13 form a second mounting cavity 200, and the second oil injection ring 40 is located in the second mounting cavity 200; wherein, the housing 13, the first end cover 14, and the second end cover 15 form the receiving cavity 11; the first end cover 14 has an oil inlet 141 and an oil outlet 142, the oil inlet 141 is connected to the oil guide groove 12, and both the first mounting cavity 100 and the second mounting cavity 200 are connected to the oil outlet 142. In this way, by configuring the housing 10 into a structure including the housing 13, the first end cover 14, and the second end cover 15, the ease of assembly of the stator core 20 is ensured. Furthermore, the end surface of the first end cover 14 facing the receiving cavity 11, the end surface of the stator core 20 facing the first end cover 14, and a portion of the inner wall of the housing 13 form a first mounting cavity 100. The first oil injection ring 30 is located within the first mounting cavity 100, ensuring reliable protection for the first oil injection ring 30 and ensuring the first oil injection... The circumferential oil injection holes of the oil ring 30 ensure the reliability of cooling the stator winding 21 on the same side, and the end surface of the second end cover 15 facing the receiving cavity 11, the end surface of the stator core 20 facing the second end cover 15, and part of the inner wall surface of the housing 13 form the second mounting cavity 200. The second oil injection ring 40 is located in the second mounting cavity 200, ensuring the reliability of protection for the second oil injection ring 40, and ensuring the reliability of cooling the stator winding 21 on the same side by the circumferential oil injection holes of the second oil injection ring 40.

[0039] like Figures 1 to 4 As shown, the housing 10 has an oil drain channel 16, the extension direction of which is consistent with the axial direction of the receiving cavity 11. The first end of the oil drain channel 16 is connected to the second mounting cavity 200, and the second end of the oil drain channel 16 is connected to the oil outlet 142. In this way, the oil drain channel 16 is provided to ensure that the lubricating oil after heat exchange with the stator winding 21 can be smoothly discharged through the oil drain channel 16, realizing the circulation of lubricating oil.

[0040] It should be noted that, in this application, at least the housing 13 is a stretch-extruded structure. This allows for the adjustment of the axial length of the housing 13, compared to existing one-piece die-cast housings, to accommodate stator cores 20 with varying stack heights.

[0041] It should be noted that in this application, the housing 13 is made of aluminum alloy. By opening the oil guide groove 12 on the housing 13, the overall weight of the oil-cooled motor can be reduced compared to opening the oil groove on the stator core 20, thus ensuring the lightweight design of the oil-cooled motor.

[0042] like Figure 1 As shown, a sealing ring 50 is provided between the inner circumferential surface of the first end cover 14 and the outer circumferential surface of the first oil injection ring 30; and / or, a sealing ring 50 is provided between the inner circumferential surface of the first end cover 14 and the outer circumferential surface of the housing 13; and / or, a sealing ring 50 is provided between the end surface of the first end cover 14 facing the receiving cavity 11 and the end surface of the stator core 20 facing the first end cover 14. In this way, the sealing ring 50 achieves axial and radial sealing of the oil-cooled motor, simplifying the cumbersome assembly process of applying flat sealant.

[0043] like Figure 1 As shown, a sealing ring 50 is provided between the inner circumferential surface of the second end cover 15 and the outer circumferential surface of the second oil injection ring 40; and / or, a sealing ring 50 is provided between the inner circumferential surface of the second end cover 15 and the outer circumferential surface of the housing 13; and / or, a sealing ring 50 is provided between the end surface of the second end cover 15 facing the receiving cavity 11 and the end surface of the stator core 20 facing the second end cover 15. In this way, the sealing ring 50 achieves axial and radial sealing of the oil-cooled motor, simplifying the cumbersome assembly process of applying surface sealant.

[0044] Optionally, the sealing ring 50 is a sealing rubber ring.

[0045] This invention provides an oil-cooled motor for an electric drive system, comprising a housing 10, a stator core 20, a first oil injection ring 30, and a second oil injection ring 40. The housing 10 has a receiving cavity 11, and the cavity wall of the receiving cavity 11 has an oil guide groove 12. The stator core 20 is disposed within the receiving cavity 11, and stator windings 21 are provided at both axial ends of the stator core 20. The outer circumferential surface of the stator core 20 and the oil guide groove 12 form an oil passage. An oil injection ring 30 is disposed at the first axial end of the stator core 20 and located on the outer periphery of the stator winding 21 on the same side; a second oil injection ring 40 is disposed at the second axial end of the stator core 20 and located on the outer periphery of the stator winding 21 on the same side; wherein, the oil passage extends along the axial direction of the housing 10 so that the two axial ends of the oil passage spray oil onto the stator winding 21 on the same side through the first oil injection ring 30 and spray oil onto the stator winding 21 on the same side through the second oil injection ring 40, respectively.

[0046] By having an oil guide groove 12 on the cavity wall of the receiving cavity 11 of the housing 10, after the stator core 20 is placed in the receiving cavity 11, the outer peripheral surface of the stator core 20 and the oil guide groove 12 form an oil passage. The oil passage extends along the axial direction of the housing 10, so that the two ends of the oil passage are respectively sprayed with oil to the stator winding 21 on the same side through the first oil spray ring 30 and the second oil spray ring 40. This ensures the reliability and uniformity of oil spraying to the stator winding 21, as well as the reliability of cooling the stator winding 21. Compared with the existing method of opening an oil groove on the outer peripheral surface of the stator core 20, it is not necessary to increase the diameter of the stator core 20, and the overall layout of the oil-cooled motor can be reduced in space.

[0047] It should be noted that in this application, the housing 13 and the stator core 20 are interference fit. The oil guide grooves 12 of the housing 13 are evenly axially distributed in the inner ring of the housing 13 to cool the stator core 20. The lubricating oil flows more evenly through the oil passage to cool the stator core 20. Furthermore, the housing 13 is formed by stretch extrusion molding. The housing 13 can be manufactured into housing products of different lengths using a single mold, which is highly compatible. The same electromagnetic scheme can be matched with any required iron stack height. For integrated (reducer front housing, electrical control bottom housing, and motor housing) die-cast housings, the arrangement of integrated multi-in-one schemes can be more flexible, and it can be matched with power supply and electrical control reducers. It is lightweight and has low manufacturing cost. Furthermore, the sealing process of the housing oil passages uses sealing rings for sealing. The installation process does not require the application of flat sealant. The assembly process only requires the sealing ring to be installed in the sealing ring groove, which is simpler than applying flat sealant, shortens the assembly time (no need to wait for the equipment to apply sealant), and reduces the need for sealant application equipment.

[0048] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0049] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0050] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0051] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0052] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0053] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An oil-cooled motor for an electric drive system, characterized in that, include: The housing (10) has a receiving cavity (11) and the cavity wall surface of the receiving cavity (11) has an oil guide groove (12); Stator core (20), the stator core (20) is disposed in the receiving cavity (11), stator windings (21) are provided at both ends of the axial direction of the stator core (20), and the outer peripheral surface of the stator core (20) and the oil guide groove (12) form an oil passage; The first oil injection ring (30) is disposed at the first axial end of the stator core (20) and located on the outer periphery of the stator winding (21) on the same side. The second oil injection ring (40) is disposed at the second axial end of the stator core (20) and located on the outer periphery of the stator winding (21) on the same side. The oil passage extends along the axial direction of the housing (10) so that the two ends of the oil passage spray oil to the stator winding (21) on the same side through the first oil injection ring (30) and spray oil to the stator winding (21) on the same side through the second oil injection ring (40).

2. The oil-cooled motor according to claim 1, characterized in that, There are multiple oil guide grooves (12), and the multiple oil guide grooves (12) are arranged circumferentially around the housing (10).

3. The oil-cooled motor according to claim 1, characterized in that, There are multiple oil guide grooves (12), and the multiple oil guide grooves (12) are evenly distributed around the circumference of the housing (10).

4. The oil-cooled motor according to claim 1, characterized in that, The outer peripheral surface of the stator core (20) is interference-fitted with the cavity wall of the receiving cavity (11).

5. The oil-cooled motor according to claim 1, characterized in that, The number N of the oil guide grooves (12) and the number M of the copper wire grooves of the stator core (20) satisfy the following condition: N = 2M.

6. The oil-cooled motor according to claim 1, characterized in that, The housing (10) includes: The housing (13) is a cylindrical structure with open ends, and the inner wall surface of the housing (13) has the oil guide groove (12); A first end cap (14) is provided on the axial first end of the housing (13) such that the end surface of the first end cap (14) facing the receiving cavity (11), the end surface of the stator core (20) facing the first end cap (14), and a portion of the inner wall surface of the housing (13) form a first mounting cavity (100), and the first oil injection ring (30) is located in the first mounting cavity (100); The second end cap (15) is provided on the second axial end of the housing (13) such that the end surface of the second end cap (15) facing the receiving cavity (11), the end surface of the stator core (20) facing the second end cap (15), and a portion of the inner wall surface of the housing (13) form a second mounting cavity (200), and the second oil injection ring (40) is located in the second mounting cavity (200); The housing (13), the first end cap (14), and the second end cap (15) form the receiving cavity (11); The first end cap (14) has an oil inlet (141) and an oil outlet (142). The oil inlet (141) is connected to the oil guide groove (12). The first mounting cavity (100) and the second mounting cavity (200) are both connected to the oil outlet (142).

7. The oil-cooled motor according to claim 6, characterized in that, The housing (10) has an oil drain channel (16), the extension direction of which is consistent with the axial direction of the receiving cavity (11), the first end of the oil drain channel (16) is connected to the second mounting cavity (200), and the second end of the oil drain channel (16) is connected to the oil outlet (142).

8. The oil-cooled motor according to claim 6, characterized in that, At least the housing (13) is a stretch extrusion molding structure.

9. The oil-cooled motor according to claim 6, characterized in that, A sealing ring (50) is provided between the inner circumferential surface of the first end cap (14) and the outer circumferential surface of the first oil injection ring (30); and / or, A sealing ring (50) is provided between the inner circumferential surface of the first end cap (14) and the outer circumferential surface of the housing (13); and / or, A sealing ring (50) is provided between the end surface of the first end cap (14) facing the receiving cavity (11) and the end surface of the stator core (20) facing the first end cap (14).

10. The oil-cooled motor according to claim 6, characterized in that, A sealing ring (50) is provided between the inner circumferential surface of the second end cap (15) and the outer circumferential surface of the second oil injection ring (40); and / or, A sealing ring (50) is provided between the inner circumferential surface of the second end cap (15) and the outer circumferential surface of the housing (13); and / or, A sealing ring (50) is provided between the end surface of the second end cap (15) facing the receiving cavity (11) and the end surface of the stator core (20) facing the second end cap (15).

Images