Oil guide ring and oil-cooled electric machine

Abstract

The application relates to an oil guide ring and an oil-cooled motor. The oil guide ring comprises an oil guide ring body, a flow guide area, an oil accumulation area, a spray hole and an oil blocking area are arranged on the oil guide ring body, the flow guide area is arranged on the outer side of the oil guide ring body and at one end of the oil guide ring body, the oil accumulation area is arranged on the outer side of the oil guide ring body and at the middle position in the axial direction of the oil guide ring body, the spray hole penetrates the oil guide ring body in the radial direction and is arranged in the oil accumulation area, the oil blocking area is arranged on the outer side of the oil guide ring body and extends from the middle position in the axial direction of the oil guide ring body to the other end of the oil guide ring body, and the oil accumulation area and the oil blocking area are arranged in a circumferential staggered mode. The application can avoid the accumulation of cooling oil directly below the oil guide ring, reduce the retention of cooling oil directly below the oil guide ring, further improve the guiding effect of the oil guide ring on the cooling oil, and thus guarantee the cooling effect of the oil-cooled motor.

Description

Technical Field

[0001] This application relates to the field of motor technology, and in particular to an oil guide ring and an oil-cooled motor. Background Technology

[0002] Motors can be cooled using oil cooling, which involves forced cooling of the various components through cooling oil. In oil-cooled motors, the stator windings of the stator assembly can be cooled by spraying through an oil guide ring. The oil guide ring can be connected to the motor housing, and cooling oil can be supplied to the oil cavity between the outer side of the oil guide ring and the inner side of the motor housing, and sprayed out through nozzles on the oil guide ring onto the ends of the stator windings. However, in existing oil-cooled motors, the guiding effect of the oil guide ring on the cooling oil needs further improvement. Utility Model Content

[0003] Based on this, this application provides an oil guide ring and an oil-cooled motor to improve the problem that the guiding effect of the oil guide ring on the cooling oil in the prior art needs to be further improved.

[0004] In a first aspect, this application provides an oil guide ring, which includes an oil guide ring body. The oil guide ring body is provided with a flow guiding area, an oil accumulation area, a spray hole, and an oil blocking area. The flow guiding area is located on the outside of the oil guide ring body and at one end of the oil guide ring body. The oil accumulation area is located on the outside of the oil guide ring body and at the middle position in the axial direction of the oil guide ring body. The spray hole penetrates the oil guide ring body radially and is located within the oil accumulation area. The oil blocking area is located on the outside of the oil guide ring body and extends from the middle position in the axial direction of the oil guide ring body to the other end of the oil guide ring body. The oil accumulation area and the oil blocking area are circumferentially offset.

[0005] In one embodiment, the circumferential angle of the oil accumulation area is greater than the circumferential angle of the oil blocking area.

[0006] In one embodiment, the oil accumulation area has a circumferential angle of 180-280°, and the oil blocking area has a circumferential angle of 80-160°.

[0007] In one embodiment, the nozzles are arranged in a plurality of circumferentially, and the plurality of nozzles are arranged symmetrically along the circumferential direction.

[0008] In one embodiment, the axial width of the oil accumulation zone is 0.3-0.7 times the axial width of the oil guide ring body.

[0009] In one embodiment, the oil guide ring body is further provided with an oil guide area, which is located on the inner side of the oil guide ring body and at the end opposite to the flow guide area. The oil guide area and the oil accumulation area are offset circumferentially.

[0010] In one embodiment, the oil guiding area is disposed circumferentially within the oil blocking area.

[0011] In one embodiment, the oil guiding area has a circumferential angle of 45-75°.

[0012] Secondly, this application provides an oil-cooled motor, which includes any of the oil guide rings provided in this application.

[0013] In one embodiment, the oil-cooled motor further includes a motor housing and a stator assembly. The stator assembly includes a stator winding. Both the stator winding and the oil guide ring are disposed within the motor housing. The minimum axial distance between the oil accumulation area of ​​the oil guide ring and the stator winding is 5-20 mm.

[0014] This application provides a guiding area and an oil accumulation area on the outer side of the oil guide ring body to ensure that the cooling oil is stably sprayed from the nozzle to the end of the stator winding. Furthermore, by providing an oil blocking area on the outer side of the oil guide ring body and offsetting the oil blocking area and the oil accumulation area circumferentially, it can prevent the cooling oil from accumulating directly below the oil guide ring, thereby reducing the amount of cooling oil remaining directly below the oil guide ring and further enhancing the guiding effect of the oil guide ring on the cooling oil, thus ensuring the cooling effect of the oil-cooled motor. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an oil guide ring provided in one embodiment of this application; Figure 2 This is a longitudinal sectional view of an embodiment of the present application showing an oil guide ring assembled into a motor housing. Figure 3 This is a circumferential cross-sectional view of an oil guide ring provided in an embodiment of this application; Figure 4 This is an axial cross-sectional view of an oil guide ring provided in an embodiment of this application.

[0016] Reference numerals: 100, oil guide ring body; 110, flow guiding area; 120, oil accumulation area; 130, spray hole; 140, oil blocking area; 150, oil guiding area; 160, sealing area; 200, motor housing; 300, stator core; 400, stator winding. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0018] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this utility model.

[0019] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this utility model can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0020] The orientations or positional relationships indicated by terms such as "upper," "lower," "left," "right," "middle," "longitudinal," "transverse," "horizontal," "inner," "outer," "radial," and "circumferential" used in this specification are based on the orientations or positional relationships shown in the accompanying drawings and are only for the purpose of simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] As described in the background section, existing oil guide rings for oil-cooled motors can have a guiding zone and an oil accumulation zone on their outer side. When the oil guide ring is connected to the motor housing, an oil inlet channel can be formed between the outer side of the guiding zone and the inner side of the motor housing, while an oil cavity communicating with the channel can be formed between the outer side of the oil accumulation zone and the inner side of the motor housing, where cooling oil can be temporarily stored. The oil accumulation zone can be equipped with spray holes to spray the cooling oil from the accumulation zone onto the ends of the stator windings. However, during actual operation, when cooling oil enters the oil accumulation zone through the guiding zone, it tends to accumulate directly below the oil guide ring and is difficult to flow out. This portion of cooling oil remains directly below the oil guide ring, which is detrimental to ensuring the cooling effect of the oil-cooled motor. Therefore, the guiding effect of the existing oil guide ring on the cooling oil needs further improvement.

[0022] Based on this, such as Figures 1 to 4As shown in the figure, this application embodiment provides an oil guide ring, which includes an oil guide ring body 100. The oil guide ring body 100 is provided with a flow guiding area 110, an oil accumulation area 120, a spray hole 130 and an oil blocking area 140. The flow guiding area 110 is located on the outside of the oil guide ring body 100 and at one end of the oil guide ring body 100. The oil accumulation area 120 is located on the outside of the oil guide ring body 100 and at the middle position in the axial direction of the oil guide ring body 100. The spray hole 130 penetrates the oil guide ring body 100 radially and is located in the oil accumulation area 120. The oil blocking area 140 is located on the outside of the oil guide ring body 100 and extends from the middle position in the axial direction of the oil guide ring body 100 to the other end of the oil guide ring body 100. The oil accumulation area 120 and the oil blocking area 140 are circumferentially offset.

[0023] like Figure 1 and Figure 2 As shown in this embodiment, by way of example, the oil guide ring may include an oil guide ring body 100, which can be fixed inside the motor housing 200, and can be sleeved on the outside of the rotor assembly and abut against the stator core 300 of the stator assembly. The oil-cooled motor may be provided with two oil guide rings, and the two oil guide rings may be respectively provided at both ends of the stator core 300.

[0024] like Figure 3 and Figure 4 As shown, in this embodiment, the oil guide ring body 100 may be provided with a flow guiding area 110, an oil accumulation area 120, a spray hole 130, and an oil blocking area 140. The flow guiding area 110 may be located on the outer side of the oil guide ring body 100 and at one end of the oil guide ring body 100, which may be the end of the oil guide ring body 100 close to the stator core 300. The end of the oil guide ring away from the stator core 300 may be set as a sealing area 160, which may be a ring-shaped structure. The outer side of the oil guide ring body 100 may abut against the inner side of the motor housing 200 at the sealing area 160, and the oil guide ring body 100 and the motor housing 200 may be press-fitted to prevent cooling oil from leaking between the oil guide ring body 100 and the motor housing 200. The outer diameter of the oil guide ring body 100 in the flow guiding area 110 can be smaller than its outer diameter in the sealing area 160, so that the outer side of the oil guide ring body 100 in the flow guiding area 110 can be spaced apart from the inner side of the motor housing 200. When the cooling oil flows into the stator core 300, it can further flow into the oil guiding area 150.

[0025] like Figure 3 and Figure 4As shown, the oil accumulation zone 120 can be located on the outer side of the oil guide ring body 100 and at the middle position in the axial direction of the oil guide ring, that is, the oil accumulation zone 120 can be adjacent to the flow guiding zone 110. The oil accumulation zone 120 can be an arc-shaped groove structure opened on the outer side of the oil guide ring body 100, and the outer diameter of the oil guide ring body 100 in the oil accumulation zone 120 can be smaller than its outer diameter in the flow guiding zone 110. When the cooling oil flows to the oil guiding zone 150, it can further flow into the oil accumulation zone 120. The nozzle 130 can penetrate the oil guide ring body 100 radially, and the nozzle 130 can be located in the oil accumulation zone 120. The cooling oil entering the oil accumulation zone 120 can be sprayed out from the nozzle 130 and can be sprayed onto the end of the stator winding 400. The oil accumulation zone 120 can hold a certain amount of cooling oil and make it reach a stable pressure state, so that the cooling oil can be stably and continuously sprayed out from the nozzle 130.

[0026] like Figure 3 and Figure 4 As shown, in this embodiment, the oil-blocking area 140 can be disposed on the outer side of the oil guide ring body 100 and can extend from the middle position of the oil guide ring body 100 axially to one end of the oil guide ring body 100. The oil-blocking area 140 can be an arc-shaped structure protruding from the outer side of the oil guide ring body 100. The outer diameter of the oil guide ring body 100 in the oil-blocking area 140 can be equal to its outer diameter in the sealing area 160, that is, the outer side of the oil guide ring body 100 in the oil-blocking area 140 can abut against the inner side of the motor housing 200. The oil-blocking area 140 and the oil accumulation area 120 can be staggered along the circumference of the oil guide ring body 100, that is, the oil-blocking area 140 and the oil accumulation area 120 do not overlap circumferentially. In the actual assembly process, the oil accumulation area 120 is used as the area directly above the oil guide ring body 100 so that cooling oil can be sprayed onto the end of the stator winding 400 through the spray hole 130. The oil-blocking area 140 is located directly below the oil guide ring body 100. It can prevent coolant from accumulating directly below the oil guide ring body 100 and being unable to flow out, thereby reducing the amount of coolant remaining directly below the oil guide ring body 100.

[0027] Understandably, this application provides a flow guiding area 110 and an oil accumulation area 120 on the outer side of the oil guide ring body 100 to ensure that the cooling oil is stably sprayed from the nozzle 130 to the end of the stator winding 400. Furthermore, by providing an oil blocking area 140 on the outer side of the oil guide ring body 100 and offsetting the oil blocking area 140 and the oil accumulation area 120 circumferentially, it can prevent the cooling oil from accumulating directly below the oil guide ring, thereby reducing the amount of cooling oil remaining directly below the oil guide ring and further enhancing the guiding effect of the oil guide ring on the cooling oil, thus ensuring the cooling effect of the oil-cooled motor.

[0028] Specifically, the circumferential angle of the oil accumulation zone 120 is greater than the circumferential angle of the oil blocking zone 140.

[0029] like Figure 3 and Figure 4 As shown in this embodiment, by way of example, the circumferential angle of the oil accumulation area 120 can be greater than the circumferential angle of the oil blocking area 140. For example, the circumferential angle of the oil accumulation area 120 can be set to 230°, while the circumferential angle of the oil blocking area 140 can be set to 110°.

[0030] It is understood that by setting the circumferential angle of the oil accumulation area 120 to be greater than that of the oil blocking area 140, the oil accumulation area 120 can occupy the upper middle part of the oil guide ring body 100 in the circumferential direction when the arrangement is completed, while the oil blocking area 140 occupies only the lower part of the oil guide ring body 100 in the circumferential direction. This can prevent the cooling oil from accumulating directly below the oil guide ring body 100, while allowing a relatively large amount of cooling oil to be sprayed onto the end of the stator winding 400, so as to ensure the cooling effect of the oil-cooled motor on the stator winding 400.

[0031] More specifically, the oil accumulation zone 120 has a circumferential angle of 180-280°, and the oil blocking zone 140 has a circumferential angle of 80-160°.

[0032] like Figure 3 and Figure 4 As shown in this embodiment, by way of example, the circumferential angle of the oil accumulation area 120 can be set to 180-280°, such as 180°, 200°, 231.6°, 260°, or 280°. The circumferential angle of the oil blocking area 140 can be set to 80-160°, such as 80°, 100°, 120°, 140°, or 160°. Within the aforementioned preferred angle range, the oil accumulation area 120 and the oil blocking area 140 can both prevent cooling oil from accumulating directly below the oil guide ring body 100 and ensure better cooling of the stator winding 400.

[0033] Specifically, there are several nozzles 130 arranged circumferentially, and these nozzles 130 are arranged symmetrically circumferentially.

[0034] like Figure 3 and Figure 4 As shown in this embodiment, by way of example, the nozzles 130 can be arranged in a plurality of circumferentially, and the plurality of nozzles 130 can be arranged at equal intervals along the circumferential direction, and the plurality of nozzles 130 can be arranged symmetrically along the circumferential direction, the axis of symmetry of which can be the center line of the oil accumulation area 120. The nozzles 130 can also be arranged in a plurality of groups along the axial direction, and this embodiment takes two groups as an example.

[0035] It is understood that by setting several nozzles 130 along the circumference and symmetrically arranging several nozzles 130 along the circumference, the cooling oil can be sprayed more evenly onto the end of the stator winding 400, thereby improving the cooling effect on the stator winding 400.

[0036] Specifically, the axial width of the oil accumulation zone 120 is 0.3-0.7 times the axial width of the oil guide ring body 100.

[0037] like Figure 3 and Figure 4 As shown in this embodiment, by way of example, the axial width of the oil accumulation area 120 can be set to 0.3-0.7 times the axial width of the oil guide ring body 100, for example, 0.3 times, 0.4 times, 0.47 times, 0.6 times, or 0.7 times. Within the aforementioned preferred width range, the oil accumulation area 120 can accommodate a relatively suitable amount of cooling oil, so that the spray nozzle 130 can spray a suitable amount of cooling oil onto the end of the stator winding 400.

[0038] Specifically, the oil guide ring body 100 is also provided with an oil guide area 150. The oil guide area 150 is located on the inner side of the oil guide ring body 100 and at the end opposite to the flow guide area 110. The oil guide area 150 and the oil accumulation area 120 are offset in the circumferential direction.

[0039] like Figure 3 and Figure 4 As shown in this embodiment, by way of example, the oil guide ring body 100 may also be provided with an oil guide area 150. The oil guide area 150 may be located inside the oil guide ring and may be located at the end opposite to the flow guide area 110, that is, at the end of the oil guide ring body 100 away from the stator core 300. The oil guide area 150 may be an arc-shaped groove structure formed inside the oil guide ring body 100, which may be non-penetrating on the oil guide ring body 100. The inner diameter of the oil guide ring body 100 in the oil guide area 150 may be larger than the inner diameter of the oil guide ring body 100 in other areas, that is, the oil guide area 150 may be concave. The oil guide area 150 and the oil accumulation area 120 may be staggered in the circumferential direction, that is, the oil guide area 150 and the oil accumulation area 120 may not overlap in the circumferential direction.

[0040] In this embodiment, after the cooling oil spray hole 130 reaches the end of the stator winding 400 and cools the end of the stator winding 400, the cooling oil can flow to the oil guide area 150. The oil guide area 150 can guide the cooling oil so that the cooling oil can flow back to the oil pan directly below the motor housing 200 in a timely manner. This avoids the accumulation of high-temperature cooling oil in the lower half of the stator winding 400, which would affect the cooling effect of the lower half of the stator winding 400. At the same time, it also prevents the level of the cooling oil from being higher than the height of the rotor assembly, which would increase the oil churning resistance when the rotor assembly rotates and cause power loss.

[0041] It is understood that, in this embodiment, by providing an oil guiding area 150 on the inner side of the oil guiding ring body 100 and offsetting the oil guiding area 150 and the oil accumulation area 120 in the circumferential direction, the cooling oil sprayed on the stator winding 400 can be timely returned through the oil guiding area 150, thereby further improving the guiding effect of the oil guiding ring body 100 on the cooling oil, thus avoiding the cooling effect of the lower half of the stator winding 400 being affected, and at the same time avoiding the loss of power of the rotor assembly.

[0042] More specifically, the oil guiding zone 150 is circumferentially arranged within the oil blocking zone 140.

[0043] like Figure 3 and Figure 4 As shown in this embodiment, by way of example, the angle of the oil guiding area 150 along the circumferential direction can be smaller than the angle of the oil blocking area 140 along the circumferential direction, and the oil guiding area 150 can be arranged circumferentially within the oil guiding area 150. For example, the oil guiding area 150 is arranged circumferentially in the middle position of the oil blocking area 140, and the center line of the oil guiding area 150 can be the center line of the oil blocking area 140.

[0044] It is understood that by circumferentially arranging the oil guiding area 150 within the oil blocking area 140 in this embodiment, the opening of the oil guiding area 150 can be avoided from affecting the effect of the oil blocking area 140 in preventing the cooling oil from accumulating directly below the oil guiding ring.

[0045] More specifically, the circumferential angle of the oil guide zone 150 is 45-75°.

[0046] like Figure 3 and Figure 4 As shown, in this embodiment, the circumferential angle of the oil guiding zone 150 can be set to 45-75°, such as 45°, 50°, 60°, 70°, and 75°. Within the aforementioned preferred angle range, the oil guiding zone 150 can ensure the effect of cooling oil flowing back to the oil pan directly below the motor housing 200.

[0047] The implementation principle of the oil guide ring provided in this application embodiment is as follows: During cooling, cooling oil can flow from the stator core 300 to the guide zone 110, and further to the oil accumulation zone 120. The cooling oil can accumulate in the oil accumulation zone 120 and reach a stable pressure, and can also be sprayed onto the ends of the stator winding 400 through the nozzles 130. After cooling the stator winding 400, the cooling oil can promptly flow back to the oil pan directly below the motor housing 200 through the oil guide zone 150. The oil baffle zone 140 prevents cooling oil from accumulating directly below the oil guide ring body 100.

[0048] This application provides a guiding area 110 and an oil accumulation area 120 on the outer side of the oil guide ring body 100 to ensure that the cooling oil is stably sprayed from the nozzle 130 to the end of the stator winding 400. Furthermore, by providing an oil blocking area 140 on the outer side of the oil guide ring body 100 and offsetting the oil blocking area 140 and the oil accumulation area 120 circumferentially, it can prevent the cooling oil from accumulating directly below the oil guide ring, thereby reducing the amount of cooling oil remaining directly below the oil guide ring and further enhancing the guiding effect of the oil guide ring on the cooling oil, thus ensuring the cooling effect of the oil-cooled motor.

[0049] This application also provides an oil-cooled motor, which includes any of the oil guide rings provided in this application.

[0050] Specifically, the oil-cooled motor also includes a motor housing 200 and a stator assembly. The stator assembly includes a stator winding 400. The stator winding 400 and the oil guide ring are both disposed inside the motor housing 200. The minimum axial distance between the oil accumulation area 120 of the oil guide ring and the stator winding 400 is 5-20mm.

[0051] like Figure 2 and Figure 4 As shown in this embodiment, the oil-cooled motor may include a motor housing 200 and a stator assembly. The stator assembly may include a stator core 300 and a stator winding 400 wound on the stator core 300. Both ends of the stator winding 400 may extend axially beyond the stator core 300. The stator assembly and the oil guide rings may both be fixed inside the motor housing 200. Two oil guide rings may be provided, and the two oil guide rings may respectively abut against both ends of the stator core 300. At this time, the oil guide rings are located outside the ends of the stator winding 400. The minimum axial distance between the oil accumulation area 120 of the oil guide ring and the stator winding 400 may be 5-20mm, such as 5mm, 10mm, 14mm, or 20mm. The end of the oil guide ring can extend axially beyond the end of the stator winding 400. The minimum axial distance between the oil accumulation area 120 and the stator winding 400 can be the distance between the end of the oil guide ring away from the stator core 300 and the end of the stator winding 400.

[0052] It is understood that by reasonably setting the minimum distance between the oil accumulation area 120 and the stator winding 400, this embodiment can ensure that the cooling oil can be accurately sprayed onto the end of the stator winding 400 under a relatively wide oil pressure range, thereby ensuring the cooling effect on the stator winding 400.

[0053] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An oil guide ring, characterized in that, The oil guide ring includes an oil guide ring body (100), on which a flow guiding area (110), an oil accumulation area (120), a spray hole (130), and an oil blocking area (140) are provided. The flow guiding area (110) is located on the outside of the oil guide ring body (100) and at one end of the oil guide ring body (100). The oil accumulation area (120) is located on the outside of the oil guide ring body (100) and at one end of the oil guide ring. At the middle position of the axial direction of the body (100), the nozzle (130) penetrates the oil guide ring body (100) radially and is disposed within the oil accumulation area (120). The oil blocking area (140) is disposed on the outside of the oil guide ring body (100) and extends from the middle position of the axial direction of the oil guide ring body (100) to the other end of the oil guide ring body (100). The oil accumulation area (120) and the oil blocking area (140) are circumferentially offset.

2. The oil guide ring according to claim 1, characterized in that, The angle of the oil accumulation area (120) along the circumference is greater than the angle of the oil blocking area (140) along the circumference.

3. The oil guide ring according to claim 2, characterized in that, The oil accumulation area (120) has a circumferential angle of 180-280°, and the oil blocking area (140) has a circumferential angle of 80-160°.

4. The oil guide ring according to claim 1, characterized in that, The nozzles (130) are arranged in a plurality of circumferential directions, and the plurality of nozzles (130) are arranged symmetrically in the circumferential direction.

5. The oil guide ring according to claim 1, characterized in that, The width of the oil accumulation area (120) along the axial direction is 0.3-0.7 times the width of the oil guide ring body (100) along the axial direction.

6. The oil guide ring according to claim 1, characterized in that, The oil guide ring body (100) is also provided with an oil guide area (150), which is located on the inner side of the oil guide ring body (100) and at the end opposite to the flow guide area (110). The oil guide area (150) and the oil accumulation area (120) are offset in the circumferential direction.

7. The oil guide ring according to claim 6, characterized in that, The oil guiding area (150) is arranged circumferentially within the oil blocking area (140).

8. The oil guide ring according to claim 7, characterized in that, The oil guiding zone (150) has a circumferential angle of 45-75°.

9. An oil-cooled motor, characterized in that, The oil-cooled motor includes an oil guide ring as described in any one of claims 1-8.

10. The oil-cooled motor according to claim 9, characterized in that, The oil-cooled motor also includes a motor housing (200) and a stator assembly. The stator assembly includes a stator winding (400). The stator winding (400) and the oil guide ring are both disposed within the motor housing (200). The minimum axial distance between the oil accumulation area (120) of the oil guide ring and the stator winding (400) is 5-20 mm.

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