Stator oil ring, stator assembly, motor, electric drive assembly and vehicle

Abstract

The present application discloses a stator oil ring, a stator assembly, a motor and a vehicle. The stator oil ring is used for the stator assembly comprising a stator and a housing arranged outside the stator. The stator oil ring comprises: an oil ring body arranged at the axial end of the stator, an annular groove formed in the outer wall of the oil ring body, and an isolation member arranged in the groove, wherein the isolation member separates the groove into a first groove part and a second groove part; the first groove part is used for defining a first oil cavity together with the housing, first oil holes are formed in the groove wall of the first groove part, and the first oil holes are used for conveying a cooling medium to windings at one end of the stator; the second groove part is used for defining a second oil cavity together with the housing, and is communicated with stator oil slots to convey the cooling medium in the second oil cavity to windings at the other end of the stator; and when the stator oil ring is installed, two oil cavities can be formed for respectively cooling the windings at both ends of the stator.

Description

Stator oil ring, stator assembly, motor, electric drive assembly and vehicle

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202420686880.1 and application date April 3, 2024, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application relates to the field of automotive technology, and in particular to a stator oil ring, a stator assembly, a motor, an electric drive assembly, and a vehicle. Background Art

[0004] With the continuous development of power systems, the application of electric motors is becoming increasingly widespread. The stator winding is a critical component of a motor, and its cooling directly affects its performance and lifespan. Therefore, research and improvement of stator winding cooling technology has always been a hot topic in the motor field.

[0005] In the existing technology, stator oil cooling mostly uses two oil rings to spray cooling on the windings at both ends of the stator. This method introduces a large number of oil rings, and the oil rings have high assembly precision requirements, resulting in high manufacturing costs, complex assembly, and increased probability of oil channel failure.

[0006] Therefore, it is necessary to design a stator oil ring, a stator assembly, a motor, an electric drive assembly and a vehicle to avoid problems caused by an excessive number of oil rings. Summary of the Invention

[0007] The purpose of this application is to overcome the shortcomings of the existing technology and provide a stator oil ring, a stator assembly, a motor, an electric drive assembly and a vehicle. After the stator oil ring is installed, two oil chambers can be formed to cool the windings at the axial ends of the stator respectively, thereby avoiding the problem of too many oil rings.

[0008] According to a first aspect of the present application, a stator oil ring is provided for a stator assembly. The stator assembly includes a housing, a stator disposed in an inner cavity of the housing, and the stator oil ring. The stator oil ring includes:

[0009] An annular oil ring body is provided at one axial end of the stator for contact with the shaft end face.

[0010] An annular groove is provided on the outer wall of the oil ring body,

[0011] An annular isolator is provided in the groove, and the isolator divides the groove into a first groove portion and a second groove portion adjacent in the axial direction. The first groove portion is used to form a first oil chamber with the housing. A first oil hole communicating with the inside and outside is provided on the groove wall of the first groove portion. The first oil hole is used to transport the cooling medium stored in the first oil chamber to the winding at one end of the stator. The second groove is used to form a second oil chamber with the housing, and the second groove is used to communicate with a stator oil groove provided on the wall of the stator to transport the cooling medium in the second oil chamber to the winding at the other end of the stator.

[0012] In one embodiment, an oil ring cover plate is provided on the inner wall of the oil ring body, and the oil ring cover plate includes an access pipe and a delivery pipe, wherein the delivery pipe communicates with the access pipe and the inner cavity of the first groove portion.

[0013] In one embodiment, the distribution density of the first oil holes decreases from the corresponding position of the oil ring cover plate in clockwise and counterclockwise directions to the opposite position in the radial direction.

[0014] In one embodiment, a first sealing groove opening radially outward is provided on the axial end surface of the oil ring body at the end where the first groove portion is located, and a second sealing groove opening axially outward is provided on the axial end surface of the oil ring body at the end where the second groove portion is located.

[0015] According to a second aspect of the present application, a stator assembly is provided, comprising the above-mentioned stator oil ring.

[0016] In one embodiment, an energy focusing ring is fixed to the other axial end of the stator, and an energy focusing ring groove for communicating with the stator oil groove is provided on the axial end face of the energy focusing ring close to the stator, and a second oil hole for communicating with the energy focusing ring groove to transport cooling medium to the winding at the other end of the stator is provided on the energy focusing ring.

[0017] In one embodiment, the energy focusing ring is provided with a plurality of second oil holes distributed along the circumferential direction with two different radial sizes, and the second oil holes are horizontal or inclined relative to the axial direction of the energy focusing ring.

[0018] In one embodiment, a first oil supply passage for communicating with the first oil chamber is provided on the housing, and a second oil supply passage for communicating with the second oil chamber is provided on the housing.

[0019] According to a third aspect of the present application, a motor is provided, comprising the above-mentioned stator assembly.

[0020] According to a fourth aspect of the present application, an electric drive assembly is provided, comprising the above-mentioned motor.

[0021] According to a fifth aspect of the present application, a vehicle is provided, comprising the above-mentioned electric drive assembly.

[0022] The above technical solution has the following beneficial effects: the stator oil ring is applied to the stator assembly, and two groove portions, namely a first groove portion and a second groove portion, are provided on the oil ring body of the stator oil ring. After the stator oil ring is installed, two oil chambers are formed with the housing of the stator assembly. These two oil chambers are respectively used to cool the windings at the axial ends of the stator. It can be seen that the provision of a single stator oil ring can achieve cooling of the windings at both ends of the stator, thereby avoiding the problem of too many oil rings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The disclosure of this application will become easier to understand with reference to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this application. In the drawings:

[0024] FIG1 shows a three-dimensional diagram of a stator oil ring according to an embodiment of the present application;

[0025] FIG2 shows a three-dimensional diagram of a stator oil ring from another perspective of an embodiment of the present application;

[0026] FIG3 shows a diagram of a stator assembly according to an embodiment of the present application, wherein part of the diagram is an axial cross-sectional view;

[0027] FIG4 shows a side view of a stator of a stator assembly according to an embodiment of the present application;

[0028] FIG5 shows a side view of an energy focusing ring of a stator assembly according to an embodiment of the present application;

[0029] FIG6 shows a three-dimensional diagram of an energy-gathering ring of a stator assembly according to another embodiment of the present application;

[0030] FIG7 is a first embodiment from FIG6 ;

[0031] FIG8 is a second embodiment from FIG6 ;

[0032] FIG9 is a third embodiment from FIG6 ;

[0033] FIG10 is an enlarged view of point A in FIG4 .

[0034] In the drawings, like parts are given like reference numerals, but the drawings are not necessarily drawn to scale. DETAILED DESCRIPTION

[0035] The specific implementation of this application is further described below with reference to the accompanying drawings.

[0036] One embodiment of the present application provides a stator oil ring. As shown in Figures 1 to 10, the stator oil ring 100 includes an oil ring body 110, a groove 120, and an isolator 130. The oil ring body 110 itself is annular. The groove 120 is arranged on the outer wall of the oil ring body 110 and is distributed along the circumference of the oil ring body 110. The isolator 130 is arranged in the groove 120 and is itself annular and extends along the circumference of the oil ring body 110. The isolator 130 separates the groove 120 into a first groove portion 121 and a second groove portion 122 that are adjacent in the axial direction. The stator oil ring 100 is used in a stator assembly, which includes a housing 300 and a stator 200 and a stator oil ring 100 arranged in the inner cavity of the housing 300. During use, the stator oil ring 100, as shown in Figure 3, is installed at one axial end of the stator 200 (where the end of the stator oil ring 100 where the second groove 122 is located abuts the axial end surface of the stator 200). It forms two distinct oil chambers with the housing 300: a first oil chamber 310 and a second oil chamber 320. Specifically, the first groove 121 forms the first oil chamber 310 with the housing 300, while the second groove 122 forms the second oil chamber 320 with the housing 300. This allows the windings 230 at both axial ends of the stator 200 to be cooled by a cooling medium, which can be cooling oil. Furthermore, the first groove 121 is provided with a first oil hole 123, which communicates internally and externally. This first oil hole 123 is used to transport the cooling oil within the first oil chamber 310 to spray cool the windings 230 of the stator 200. Multiple first oil holes 123 can be provided, enabling multi-directional spraying, thereby enhancing the cooling effect. The second groove 122 is used to communicate with the stator oil groove 220 provided on the wall of the stator 200 to transport the cooling medium within the second oil chamber 320 to the winding 230 at the other end of the stator 200. Thus, the stator oil ring 100 of the present application can achieve cooling of the windings 230 at both ends of the stator 200, eliminating the need for additional stator oil rings. Consequently, the stator oil ring 100 can help reduce the number of parts in the stator assembly, lowering assembly requirements and manufacturing costs.

[0037] In one embodiment, an oil ring cover plate 140 is installed on the inner wall of the oil ring body 110. As shown in Figure 1, the oil ring cover plate 140 includes an inlet pipe 141 and a delivery pipe 142. The inlet pipe 141 is constructed in the shape of a pipe joint to receive external cooling oil. The delivery pipe 142 connects the inlet pipe 141 with the inner cavity of the first groove portion 121 and can be constructed in a boxed form. During use, the inlet pipe 141 receives external cooling oil and transfers it through the delivery pipe 142 to the first oil chamber 310 where the first groove portion 121 is located. The provision of the oil ring cover plate 140 facilitates the supply of cooling oil to the first oil chamber 310. Furthermore, this configuration allows for more flexible layout of the first oil supply channel 330, simplifying manufacturing. After installation, the oil ring cover plate 140 is mounted at the top of the oil ring body 110.

[0038] The distribution density of the first oil holes 123 in the circumferential direction of the oil ring body 110 is not uniform. Specifically, the distribution density of the first oil holes 123 decreases from the position of the oil ring cover plate 140 in the clockwise and counterclockwise directions to the relative position in the radial direction. That is to say, after the oil ring 100 is installed, the distribution of the first oil holes 123 can change from dense to sparse in the direction from the top to the bottom. It can be understood that in the circumferential direction, the distribution of the first oil holes 123 is symmetrical about the vertical diameter. This arrangement takes into account the gravity factor. The first oil holes 123 at the top are distributed more densely, which can provide more cooling oil to the winding on this side. Under the action of gravity, the cooling oil can further fall and cool down. It can be seen that the present application plans and arranges the distribution of the first oil holes 123 while taking into account the gravity factor, thereby improving the cooling effect more economically.

[0039] A first sealing groove 111 and a second sealing groove 112 are provided on the oil ring body 110. The first sealing groove 111 is located at the axial end face where the first groove portion 121 is located, and its opening faces radially outward. After installation, the first sealing groove 111 is used to embed the first sealing ring 350 and seal against the housing 300 to achieve sealing of the first oil chamber 310. The second sealing groove 112 is located on the axial end face where the second groove portion 122 is located, and its opening faces axially outward. After installation, the second sealing groove 112 is used to embed the second sealing ring 360 and seal against the axial end face of the stator 200 to achieve sealing of the second oil chamber 320. The provision of the first sealing groove 111 and the second sealing groove 112 facilitates the installation of the first sealing ring 350 and the second sealing ring 360, thereby achieving sealing between the oil ring 100 and the housing 300 and the stator 200, respectively. In addition, a positioning groove 113 is further provided at the second sealing groove 112 of the oil ring body 110 for defining the position of the second sealing ring 360 , thereby making the assembly of the second sealing ring 360 easier.

[0040] The present application also relates to a stator assembly. As shown in FIG3 , the stator assembly includes a stator 200, the above-mentioned stator oil ring 100, and a housing 300. The housing 300 is arranged on the outside of the stator 200 and the stator oil ring 100. After the stator oil ring 100, the stator 200, and the housing 300 are installed, the stator oil ring 100 and the housing 300 form a first oil chamber 310 at the first groove portion 121. The stator oil ring 100 and the housing 300 form a second oil chamber 320 at the second groove portion 122. As shown in FIG4 and FIG10 , the stator 200 is provided with a stator slot 210 and a stator oil slot 220. Among them, the stator slot 210 is an axial through slot for the winding 230 to pass through. The stator oil slot 220 is also an axial through slot and is located radially outside the stator slot 210, and is mainly used as a circulation channel for the cooling medium. Specifically, structurally, one end of the stator oil groove 220 is connected to the second oil chamber 320 at the second groove portion 122 , so as to transport the cooling oil on the axial side to the other axial side.

[0041] A focusing ring 400 is fixed to the other axial end of the stator 200. As shown in Figures 5 to 9, a focusing ring groove 410 is provided on the axial end surface of the focusing ring 400, which is adjacent to the stator 200. This focusing ring groove 410 is configured to communicate with the stator oil groove 220, thereby receiving and storing coolant. A second oil hole 420 is provided in the focusing ring 400. This second oil hole 420 is configured to communicate with the focusing ring groove 410 and is used to spray the cooling oil in the focusing ring groove 410 out to cool the winding 230 at this end.

[0042] Depending on different needs, the energy-focusing ring grooves 410 can be configured as multiple, circumferentially spaced grooves, each in a "T" shape, as shown in Figure 5. In this embodiment, the second oil holes 420 can be configured as through-holes disposed radially inwardly of the energy-focusing ring grooves 410. It will be appreciated that the number and position of the stator oil grooves 220 will also need to be adjusted to accommodate the different distributions of the energy-focusing ring grooves 410.

[0043] The energy focusing ring groove 410 can also be constructed as a through groove extending in the circumferential direction. In this solution, the second oil hole 420 is constructed as a connecting hole arranged on the groove wall of the through groove. The second oil hole 420 can be constructed in different distribution forms. For example, the axial direction of the second oil hole 420 can be consistent with the axial direction of the energy focusing ring 400, or it can be inclined relative to the axial direction of the energy focusing ring 400. A plurality of second oil holes 420 distributed in the circumferential direction can also be provided on the energy focusing ring 400. The axial distribution of the second oil holes 420 on circumferences of different diameters can be the same or different. Several embodiments of the second oil holes 420 are given in Figures 7 to 9. In Figure 7, the axial directions of the two groups of second oil holes 420 extend along the axial direction of the energy focusing ring 400. This arrangement is mainly suitable for, for example, the outer envelope of the winding 230 is basically flush with the upper surface of the oil hole. The cooling oil can be directly sprayed onto the outer contour of the winding 230 and flow downward, passing through more heat sources. In Figure 8, the axial directions of the two sets of second oil holes 420 are tilted relative to the axial direction of the energy-accumulating ring 400 and are inclined in the same direction, for example, radially inward. This is primarily applicable when the outer diameter of the outer envelope of the winding 230 differs significantly from the outer diameter of the energy-accumulating ring 400. The second oil holes 420 spray oil at an angle to the winding surface. In Figure 9, the axial directions of the two sets of second oil holes 420 are tilted relative to the axial direction of the energy-accumulating ring 400, and the downstream ends extend away from the upstream ends. This arrangement is suitable for windings 230 with a large number of layers (as seen in the figure, with a longer vertical length). The second oil holes 420 spray oil in a divergent manner to the outer contour and lower middle portion of the winding 230, resulting in more uniform cooling. In short, the size of the energy-accumulating ring groove 410 on the energy-accumulating ring 400 is flexibly adjustable to control the distance at which the cooling oil is sprayed. The size, angle, and number of the second oil holes 420 can be flexibly adjusted according to actual cooling needs.

[0044] During installation, the energy focusing ring 400 is placed against the axial end face of the stator 200. The outer wall of the energy focusing ring 400 is on the same cylindrical surface as the outer wall of the stator 200. The inner wall of the energy focusing ring 400 extends radially to the stator slot 210. For example, the inner wall diameter of the energy focusing ring 400 is approximately 5 mm smaller than the radial slot wall diameter of the stator slot 210. This arrangement can effectively prevent the energy focusing ring 400 from interfering with the winding 230. In addition, the axial dimension of the energy focusing ring 400 is approximately 2 mm to ensure its own structural strength while not significantly increasing the structural dimensions of the stator assembly.

[0045] The housing 300 is provided with a first oil supply passage 330 for communicating with the first oil chamber 310. For example, the first oil supply passage 330 can be provided on the shaft end face of the housing 300. The shaft end face is used to supply cooling oil, and the oil supply method and location can be flexibly adjusted according to actual needs. The housing 300 is provided with a second oil supply passage 340 for communicating with the second oil chamber 320. For example, the second oil supply passage 340 can be provided on the peripheral wall of the housing 300. The arrangement of the first oil supply passage 330 and the second oil supply passage 340 can be adjusted according to actual needs.

[0046] After installation, the spacer 130 is positioned close to the inner wall of the housing 300, separating the first oil chamber 310 from the second oil chamber 320. The spacer 130 and the housing 300 can be fitted with a clearance, for example, a gap of 0.05-0.15 mm. This arrangement ensures smooth installation of the stator oil ring 100 within the inner cavity of the housing 300. Furthermore, both the first and second oil chambers 310, 320 store cooling oil. Even if some cooling oil flows between the first and second oil chambers 310, 320 through the spacer 130, it does not affect the cooling effect.

[0047] The stator oil ring 100 may be an integral structure. Of course, in order to simplify the manufacturing cost, the stator oil ring 100 may be formed by welding or bonding two axial parts into one.

[0048] The cooling working principle of the stator assembly is described in detail below based on Figures 1 to 10.

[0049] Cooling oil is supplied through the first oil supply passage 330, and then enters the first oil chamber 310 through the access pipe 141 and the delivery pipe 142. The cooling oil in the first oil chamber 310 is ejected through the first oil hole 123 to cool the winding 230 at this end.

[0050] The cooling oil enters the second oil chamber 320 through the second oil supply passage 340. Then, it is transported through the stator oil groove 220, enters the energy-gathering ring groove 410, and finally sprayed out through the second oil hole 420 to cool the winding 230 at the other end.

[0051] An embodiment of the present application also provides a motor, wherein the motor includes the above-mentioned stator assembly.

[0052] An embodiment of the present application further provides an electric drive assembly, wherein the electric drive assembly includes the above-mentioned motor.

[0053] An embodiment of the present application also provides a vehicle, wherein the vehicle includes the above-mentioned electric drive assembly.

[0054] In the description of this application, it should be noted that, unless otherwise specified, "plurality" means two or more; the terms "inward" and "outward" refer to directions toward or away from the geometric center of a particular component, respectively. Furthermore, the terms "first," "second," etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

[0055] The above are only the principles and preferred embodiments of the present application. It should be noted that, for those skilled in the art, on the basis of the principles of the present application, several other modifications can be made, which should also be considered as the scope of protection of the present application.

Claims

1. A stator oil ring for a stator assembly, the stator assembly comprising a housing, a stator disposed in an inner cavity of the housing, and the stator oil ring, the stator oil ring comprising: An annular oil ring body is provided at one axial end of the stator for contact with the shaft end face. An annular groove is provided on the outer wall of the oil ring body, An annular isolator is provided in the groove, and the isolator divides the groove into a first groove portion and a second groove portion adjacent in the axial direction. The first groove portion is used to form a first oil chamber with the housing. A first oil hole communicating with the inside and outside is provided on the groove wall of the first groove portion. The first oil hole is used to transport the cooling medium stored in the first oil chamber to the winding at one end of the stator. The second groove is used to form a second oil chamber with the housing, and the second groove is used to communicate with a stator oil groove provided on the wall of the stator to transport the cooling medium in the second oil chamber to the winding at the other end of the stator.

2. The stator oil ring according to claim 1, wherein an oil ring cover plate is provided on the inner wall of the oil ring body, and the oil ring cover plate contains an access pipe and a delivery pipe, wherein: The delivery pipe communicates with the access pipe and the inner cavity of the first groove portion. 3 . The stator oil ring according to claim 2 , wherein the distribution density of the first oil holes decreases from the corresponding position of the oil ring cover plate in clockwise and counterclockwise directions to the opposite position in the radial direction.

4. The stator oil ring according to any one of claims 1 to 3, wherein a first sealing groove opening radially outward is provided on the axial end surface of the end where the first groove portion of the oil ring body is located, and a second sealing groove opening axially outward is provided on the axial end surface of the end where the second groove portion of the oil ring body is located.

5. A stator assembly comprising the stator oil ring according to any one of claims 1 to 4.

6. The stator assembly according to claim 5, wherein an energy focusing ring is fixed at the other axial end of the stator, and an energy focusing ring groove for communicating with the stator oil groove is provided on the axial end face of the energy focusing ring close to the stator, and a second oil hole for communicating with the energy focusing ring groove to transport cooling medium to the winding at the other end of the stator is provided on the energy focusing ring.

7. The stator assembly according to claim 6, wherein the energy focusing ring is provided with a plurality of second oil holes distributed along the circumferential direction of two different radial sizes, and the second oil holes are horizontal or inclined relative to the axial direction of the energy focusing ring.

8. The stator assembly according to any one of claims 5 to 7, wherein the housing is provided with a first oil supply passage for communicating with the first oil chamber, and the housing is provided with a second oil supply passage for communicating with the second oil chamber.

9. An electric motor comprising the stator assembly according to any one of claims 5 to 8.

10. An electric drive assembly comprising the motor according to claim 9.

11. A vehicle comprising the electric drive assembly according to claim 10.

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