Stator oil ring, stator assembly, motor and vehicle

Abstract

The utility model 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 shell arranged at the outer side of the stator, the stator oil ring comprises an oil ring main body arranged at one axial end of the stator and an annular groove arranged on the outer wall of the oil ring main body, a groove is formed in the shell, the isolation piece is arranged in the groove and divides the groove into a first groove part and a second groove part, the first groove part is used for forming a first oil cavity with the shell, a first oil hole is formed in the groove wall of the first groove part, and a second oil hole is formed in the groove wall of the second groove part. The first oil hole is used for conveying a cooling medium to a winding at one end of the stator, the second groove is used for forming a second oil cavity with the shell and communicating with a stator oil groove so as to convey the cooling medium in the second oil cavity to a winding at the other end of the stator, and the stator oil ring can form two oil cavities after being installed. Therefore, the windings at the two ends of the stator are cooled respectively.

Description

Technical Field

[0001] The utility model relates to the technical field of automobiles, in particular to a stator oil ring, a stator assembly, a motor and a vehicle. Background Art

[0002] With the continuous development of power systems, the application of motor equipment is becoming more and more extensive. In the motor, the stator winding is an important component, and its cooling effect directly affects the performance and life of the motor. Therefore, the research and improvement of the cooling technology of the stator winding has always been a hot issue in the motor field.

[0003] In the prior art, 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.

[0004] Therefore, it is necessary to design a stator oil ring, a stator assembly, a motor and a vehicle to avoid the problems caused by too many oil rings. Utility Model Content

[0005] The utility model aims to overcome the deficiencies of the prior art and to provide a stator oil ring, a stator assembly, a motor 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.

[0006] According to a first aspect of the utility model, a stator oil ring is provided for a stator assembly, wherein the stator assembly comprises a housing, a stator and the stator oil ring arranged in an inner cavity of the housing, and the stator oil ring comprises:

[0007] The annular oil ring body is arranged at one axial end of the stator in a shaft end-face abutment manner.

[0008] An annular groove is provided on the outer wall of the oil ring body,

[0009] An annular isolating member is arranged in the groove, and the isolating member divides the groove into a first groove portion and a second groove portion adjacent to each other in the axial direction, the first groove portion is used to form a first oil chamber with the housing, and a first oil hole communicating inside and outside is arranged on the groove wall of the first groove portion, and 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 arranged 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.

[0010] In one embodiment, an oil ring cover plate is disposed 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.

[0011] In one embodiment, the distribution density of the first oil holes decreases from the corresponding position of the oil ring cover plate along the clockwise and counterclockwise directions to the opposite position in the radial direction.

[0012] In one embodiment, 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.

[0013] According to a second aspect of the utility model, a stator assembly is provided, comprising the above-mentioned stator oil ring.

[0014] 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 other end winding of the stator is provided on the energy focusing ring.

[0015] 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.

[0016] In one embodiment, a first oil supply passage for communicating with the first oil chamber is disposed on the housing, and a second oil supply passage for communicating with the second oil chamber is disposed on the housing.

[0017] According to a third aspect of the utility model, a motor is provided, comprising the above-mentioned stator assembly.

[0018] According to a fourth aspect of the utility model, a vehicle is provided, comprising the above-mentioned motor.

[0019] The above technical solution has the following beneficial effects: the stator oil ring is applied to the stator assembly, and two groove portions, namely the first groove portion and the second groove portion, are provided on the oil ring body of the stator oil ring, so that after the stator oil ring is installed, two oil chambers are formed with the housing of the stator assembly, and the two oil chambers are respectively used for cooling the windings at the axial ends of the stator. It can be seen that the cooling of the windings at the two ends of the stator can be achieved by providing one stator oil ring, thereby avoiding the problem of too many oil rings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The disclosure of the present invention will become easier to understand with reference to the accompanying drawings. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the drawings:

[0021] Figure 1 A three-dimensional diagram showing a stator oil ring according to an embodiment of the utility model;

[0022] Figure 2 A three-dimensional diagram showing another perspective of a stator oil ring of an embodiment of the utility model;

[0023] Figure 3 A diagram showing a stator assembly of an embodiment of the utility model, wherein part of the stator assembly is an axial cross-sectional view;

[0024] Figure 4 A side view of a stator of a stator assembly according to an embodiment of the present invention is shown;

[0025] Figure 5 A side view of an energy focusing ring of a stator assembly according to an embodiment of the utility model is shown;

[0026] Figure 6 A three-dimensional diagram showing an energy focusing ring of a stator assembly according to another embodiment of the utility model;

[0027] Figure 7 For Figure 6 A first embodiment of the present invention;

[0028] Figure 8 For Figure 6 A second embodiment of the present invention;

[0029] Fig. 9 For Figure 6 A third embodiment of the present invention;

[0030] Fig.10 For Figure 4 Enlarged view of point A.

[0031] In the drawings, the same reference numerals are used for the same components. The drawings are not drawn to scale. DETAILED DESCRIPTION

[0032] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings.

[0033] An embodiment of the present utility model provides a stator oil ring. Figures 1 to 10As shown, the stator oil ring 100 includes an oil ring body 110, a groove 120 and an isolating member 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 circumferential extension of the oil ring body 110. The isolating member 130 is arranged in the groove 120 and is annular in shape and is distributed along the circumferential extension of the oil ring body 110. The isolating member 130 separates the groove 120 into a first groove portion 121 and a second groove portion 122 which are adjacent in the axial direction. The stator oil ring 100 is used in a stator assembly, and the stator assembly includes a housing 300 and a stator 200 and a stator oil ring 100 arranged in the inner cavity of the housing 300. During the use of the stator oil ring 100, as Figure 3 As shown, it is installed at one axial end of the stator 200 (wherein the end where the second groove portion 122 of the stator oil ring 100 is located abuts against the axial end surface of the stator 200), and forms two different oil chambers with the housing 300, namely the first oil chamber 310 and the second oil chamber 320. Specifically, the first groove portion 121 is used to form the first oil chamber 310 with the housing 300, and the second groove portion 122 is used to form the second oil chamber 320 with the housing 300. Thus, the windings 230 at both axial ends of the stator 200 are respectively supplied with cooling medium, which can be cooling oil, to achieve the cooling of the windings 230 at both ends of the stator 200. In addition, the first oil hole 123 connected inside and outside is provided on the groove wall of the first groove portion 121. The first oil hole 123 is used to transport the cooling oil in the first oil chamber 310 to spray the windings 230 of the stator 200. There can be multiple first oil holes 123, which can spray in multiple directions, thereby improving 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 in the second oil chamber 320 to the winding 230 at the other end of the stator 200. It can be seen that the stator oil ring 100 of the present application can realize the cooling of the winding 230 at both ends of the stator 200, avoiding the need to further set other stator oil rings. Therefore, the stator oil ring 100 can help reduce the number of parts of the stator assembly, reduce assembly requirements, and reduce manufacturing costs.

[0034] In one embodiment, an oil ring cover plate 140 is disposed on the inner wall of the oil ring body 110. Figure 1As shown, the oil ring cover plate 140 contains an access pipe 141 and a delivery pipe 142. Among them, the access pipe 141 is constructed in the shape of a pipe joint to receive external cooling oil. The delivery pipe 142 connects the access pipe 141 with the inner cavity of the first groove part 121, and itself can be constructed as a box. During use, the access pipe 141 receives external cooling oil and transfers it to the first oil chamber 310 where the first groove part 121 is located through the delivery pipe 142. It can be seen that by setting the oil ring cover plate 140, it is convenient to supply cooling oil to the first oil chamber 310, and this setting can make the layout of the first oil supply channel 330 more flexible and simplify the processing. After installation, the installation point of the oil ring body 110 where the oil ring cover plate 140 is located is located at the top.

[0035] The distribution density of the first oil holes 123 in the circumferential direction of the oil ring body 110 is not the same. 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 setting takes into account the gravity factor. The first oil holes 123 at the top are distributed more densely, and more cooling oil can be provided to the winding on this side. Under the action of gravity, the cooling oil can further fall for cooling. It can be seen that the present application plans and sets the distribution of the first oil holes 123 while taking into account the gravity factor, thereby improving the cooling effect more economically.

[0036] The oil ring body 110 is provided with a first sealing groove 111 and a second sealing groove 112. The first sealing groove 111 is located at the shaft end face where the first groove portion 121 is located, and the opening is radially outward. After installation, the first sealing groove 111 is used to embed the first sealing ring 350, and sealably abuts against the housing 300, so as to achieve the sealing of the first oil chamber 310. The second sealing groove 112 is located on the shaft end face where the second groove portion 122 is located, and the opening is axially outward. After installation, the second sealing groove 112 is used to embed the second sealing ring 360, and sealably abuts against the shaft end face of the stator 200, so as to achieve the sealing of the second oil chamber 320. By providing the first sealing groove 111 and the second sealing groove 112, the installation of the first sealing ring 350 and the second sealing ring 360 is facilitated, thereby achieving the sealing of the oil ring 100 with 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 to limit the position of the second sealing ring 360 , so that the assembly of the second sealing ring 360 is easier.

[0037] The present application also relates to a stator assembly. Figure 3As shown, the stator assembly includes a stator 200, the above-mentioned stator oil ring 100 and a housing 300. The housing 300 is arranged outside 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. Figure 4 and 10 As shown, the stator 200 is provided with a stator slot 210 and a stator oil slot 220. 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, in terms of structure, one end of the stator oil slot 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 side of the axial direction.

[0038] The energy focusing ring 400 is fixed at the other axial end of the stator 200. Figures 5 to 9 As shown, an energy focusing ring groove 410 is provided on the axial end surface of the energy focusing ring 400 close to the stator 200. The energy focusing ring groove 410 is used to communicate with the stator oil groove 220, so as to receive and store the coolant. A second oil hole 420 is provided on the energy focusing ring 400. The second oil hole 420 is used to communicate with the energy focusing ring groove 410, and is used to spray out the cooling oil in the energy focusing ring groove 410 to cool the winding 230 at this end.

[0039] According to different needs, the energy focusing ring groove 410 can be configured as a plurality of grooves distributed at intervals in the circumferential direction, each of which is configured as a "T" shape, such as Figure 5 In this solution, the second oil hole 420 can be configured as a through hole disposed at the radial inner end of the energy focusing ring groove 410. It can be understood that because the distribution of the energy focusing ring groove 410 is different, the number and position of the corresponding stator oil groove 220 are also adjusted.

[0040] 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 set on the energy focusing ring 400. The axial distribution of the second oil holes 420 on circles of different diameters can be the same or different. Figures 7 to 9 Several embodiments of the second oil hole 420 are given in FIG. Figure 7In the embodiment, the axial direction of the two groups of second oil holes 420 extends along the axial direction of the energy focusing ring 400. This arrangement is mainly suitable for the case where the outer envelope of the winding 230 is substantially 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. Figure 8 In the embodiment, the axial directions of the two groups of second oil holes 420 are inclined relative to the axial direction of the energy-gathering ring 400 and are inclined in the same direction, for example, radially inward, which is mainly suitable for the case where the outer diameter of the outer envelope of the winding 230 is greatly different from that of the energy-gathering ring 400, and the second oil holes 420 are inclined to spray to the surface of the winding. Fig. 9 In the figure, the axial directions of the two groups of second oil holes 420 are inclined relative to the axial direction of the energy focusing 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 (from the figure, the upper and lower lengths are longer). The second oil holes 420 are sprayed in a divergent manner to the outer contour and the lower middle part of the winding 230, and the cooling is more uniform. In short, the size of the energy focusing ring groove 410 on the energy focusing ring 400 is flexibly adjustable to achieve the control of the distance of the cooling oil spraying, and the size, angle, and number of the second oil holes 420 can be flexibly adjusted according to actual cooling needs.

[0041] During the installation process, the energy focusing ring 400 is abutted 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 radially extends to the stator slot 210. For example, the inner wall diameter of the energy focusing ring 400 is about 5 mm smaller than the radial slot wall diameter of the stator slot 210. This arrangement can effectively avoid interference between the energy focusing ring 400 and the winding 230. In addition, the axial dimension of the energy focusing ring 400 itself is approximately 2 mm, which is used to ensure its own structural strength, and at the same time, it will not greatly increase the structural dimensions of the stator assembly.

[0042] 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 opened on the shaft end face of the housing 300. The shaft end face is fed with cooling oil, and the oiling method and position can be flexibly changed 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 arranged 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.

[0043] After installation, the isolating member 130 is close to the inner wall of the housing 300, and is used to separate the first oil chamber 310 and the second oil chamber 320. The isolating member 130 and the housing 300 can be gap-matched, for example, the gap between the two is 0.05-0.15 mm. This arrangement can ensure that the stator oil ring 100 is smoothly installed in the inner cavity of the housing 300. In addition, the first oil chamber 310 and the second oil chamber 320 are both used to store cooling oil, and even if a little cooling oil flows between the first oil chamber 310 and the second oil chamber 320 through the isolating member 130, it does not affect the cooling effect.

[0044] 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.

[0045] According to the following Figures 1 to 10 Describe in detail the cooling working principle of the stator assembly.

[0046] The cooling oil is supplied through the first oil supply passage 330, and the cooling oil enters the first oil chamber 310 after passing through the access pipe 141 and the delivery pipe 142 in sequence. The cooling oil in the first oil chamber 310 is ejected out through the first oil hole 123 to cool the winding 230 at this end.

[0047] The cooling oil enters the second oil chamber 320 through the second oil supply passage 340. Then, it enters the energy-gathering ring groove 410 through the stator oil groove 220, and finally sprays out through the second oil hole 420 to cool the winding 230 at the other end.

[0048] The invention also relates to a motor and a vehicle. The motor comprises the stator assembly described above. The vehicle comprises the motor described above.

[0049] In the description of the present invention, it should be noted that, unless otherwise specified, "plurality" means two or more than two; the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. In addition, the terms "first", "second", etc. are used only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0050] The above are only the principles and preferred embodiments of the present invention. It should be noted that, for those skilled in the art, on the basis of the principles of the present invention, several other modifications can be made, which should also be considered as the protection scope of the present invention.

Claims

1. A stator oil ring for a stator assembly, the stator assembly comprising a housing and a stator and the stator oil ring arranged in an inner cavity of the housing, characterized in that: The stator oil ring comprises: The annular oil ring body is arranged at one axial end of the stator in a shaft end-face abutment manner. An annular groove is provided on the outer wall of the oil ring body, An annular isolating member is arranged in the groove, and the isolating member divides the groove into a first groove portion and a second groove portion adjacent to each other in the axial direction, the first groove portion is used to form a first oil chamber with the housing, and a first oil hole communicating inside and outside is arranged on the groove wall of the first groove portion, and 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 arranged 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, characterized in that: An oil ring cover plate is arranged 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.

3. The stator oil ring according to claim 2, characterized in that: The distribution density of the first oil holes decreases from the corresponding position of the oil ring cover plate along the 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, characterized in that: 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 where the second groove portion of the oil ring body is located.

5. A stator assembly, characterized in that: Comprising a stator oil ring according to any one of claims 1 to 4.

6. The stator assembly according to claim 5, characterized in that: 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 arranged 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 other end winding of the stator is arranged on the energy focusing ring.

7. The stator assembly according to claim 6, characterized in that: 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.

8. The stator assembly according to claim 5, characterized in that: 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. A motor, characterized in that: Comprising a stator assembly according to any one of claims 5 to 8.

10. A vehicle, characterized in that: Comprising an electric machine according to claim 9.

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