Stator assembly, oil-cooled motor and vehicle

Abstract

The utility model relates to a stator assembly, an oil cooling motor and a vehicle, the stator assembly comprises a stator iron core, a stator winding and an oil injection ring, the stator winding is arranged in the stator iron core and is exposed out of the end part of the stator iron core, and the oil injection ring is arranged on one side, deviating from the stator iron core, of the stator winding along the axial direction of the stator winding; a plurality of oil spraying holes are formed in the face, facing the stator winding, of the oil spraying ring, the oil spraying holes are at least arranged in the circumferential direction of the oil spraying ring at intervals so as to conduct axial spraying on the stator winding, the vertical distances between the hole centers of at least part of the oil spraying holes and the axis of the stator winding are different, and the flow speeds of cooling oil sprayed out of the oil spraying holes are basically equal during axial spraying. Cooling of the stator winding is uniform, and the cooling effect and cooling efficiency of the stator winding are improved. The positions of at least part of the hole centers of the oil injection holes in the radial direction of the oil injection ring are different, so that cooling oil can be injected to different positions of the stator winding in the radial direction, distribution is uniform, and the cooling effect and the cooling efficiency of the stator winding are better.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicle technology, and in particular to a stator assembly, an oil-cooled motor and a vehicle. Background Art

[0002] In recent years, new energy vehicles have developed rapidly, and major vehicle and parts manufacturers are developing new energy vehicles and supporting facilities that meet market demand. As the power output device of new energy vehicles, motors have gradually tended to high power density and high speed, and their heat dissipation problem has become more important. Therefore, this puts higher requirements on the cooling of motors.

[0003] The motor usually includes a housing, in which a stator core and an oil spray ring are arranged. The stator core is provided with a stator winding, which is exposed outside the axial end of the stator core. The oil spray ring is arranged on the outside of the stator winding along the circumference of the stator core, and a plurality of oil holes are opened on the oil spray ring. During the engineering process of the motor, the temperature of the stator winding end is usually relatively high, and cooling oil is sprayed to the stator winding through the oil holes to cool the stator winding.

[0004] However, in the prior art, the cooling of the stator winding by the oil spray ring is radial spraying. During radial spraying, the flow rate of the cooling oil after being sprayed out from the upper oil hole is greater than the flow rate of the cooling oil after being sprayed out from the lower oil hole, resulting in uneven cooling of the stator winding, poor cooling effect, and low cooling efficiency. Utility Model Content

[0005] In order to solve the above technical problems, the present disclosure provides a stator assembly, an oil-cooled motor and a vehicle.

[0006] The present disclosure provides a stator assembly, the stator assembly comprising a stator core, a stator winding and an oil injection ring;

[0007] The stator winding is arranged in the stator core and exposed outside the end of the stator core. Along the axial direction of the stator winding, the oil injection ring is arranged on the side of the stator winding away from the stator core;

[0008] The oil injection ring is provided with an oil inlet and a cooling oil chamber connected with the oil inlet. A plurality of oil injection holes connected with the cooling oil chamber are provided on a side of the oil injection ring facing the stator winding. The plurality of oil injection holes are arranged at least at intervals along the circumference of the oil injection ring to axially spray the stator winding, and the vertical distances between the hole centers of at least some of the oil injection holes and the axis of the stator winding are different.

[0009] Optionally, the stator winding has an axial section along the horizontal direction, at least part of the oil injection holes located above the axial section are arranged close to the outer ring of the stator winding, and at least part of the oil injection holes located below the axial section are arranged close to the inner ring of the stator winding.

[0010] Optionally, the oil injection ring comprises at least two ring segments, at least two of the ring segments are sealed and connected in sequence along the circumference of the stator winding, and the inner cavities of all the ring segments are connected to form the cooling oil cavity;

[0011] A plurality of oil injection holes are arranged on one side of each ring segment facing the stator winding, a radius of curvature of each ring segment is located between the inner diameter and the outer diameter of the stator winding, and a radius of curvature of the ring segment located above the axial section is set close to the outer diameter of the stator winding, while a radius of curvature of the ring segment located below the axial section is set close to the inner diameter of the stator winding.

[0012] Optionally, a junction between two adjacent ring segments has a smooth transition.

[0013] Optionally, among the multiple oil injection holes on each ring segment, some of the oil injection holes are arranged at intervals along the arc direction of the ring segment, and some of the oil injection holes are arranged at intervals along the radial direction of the ring segment.

[0014] Optionally, the oil injection ring includes a first ring body and a second ring body;

[0015] The first ring body and the second ring body are coaxially arranged and sealedly connected. At least one of the first ring body and the second ring body is provided with an oil groove for accommodating cooling oil, so as to enclose and form the cooling oil cavity when the first ring body and the second ring body are connected in place.

[0016] Optionally, the first ring body and the second ring body are welded together;

[0017] And / or, along the axial direction of the stator winding, the oil inlet is arranged on one of the first ring body and the second ring body that is away from the stator winding.

[0018] Optionally, along the axial direction of the stator winding, the oil inlet is arranged on a side of the oil injection ring away from the stator winding.

[0019] Optionally, there are two oil injection rings, and along the axial direction of the stator winding, both ends of the stator winding are exposed outside the stator core, and the two oil injection rings are respectively arranged at both ends of the stator winding along the axial direction of the stator winding.

[0020] Optionally, at least two connecting ears are provided on the oil injection ring, and at least two of the connecting ears are arranged on the outer ring wall of the oil injection ring at intervals along the circumference of the oil injection ring, and each of the connecting ears is provided with at least one mounting hole for connecting to the housing of the oil-cooled motor.

[0021] In a second aspect, the present disclosure further provides an oil-cooled motor, comprising a housing and a stator assembly as described above, disposed in the housing.

[0022] In a third aspect, the present disclosure further provides a vehicle, comprising a stator assembly as described above, or an oil-cooled motor as described above.

[0023] Compared with the prior art, the technical solution provided by the embodiments of the present disclosure has the following advantages:

[0024] The stator assembly, oil-cooled motor and vehicle provided by the present disclosure are provided with a stator core, a stator winding and an oil spray ring, wherein the stator winding is provided in the stator core and exposed outside the end of the stator core. Along the axial direction of the stator winding, the oil spray ring is provided on the side of the stator winding away from the stator core, that is, the oil spray ring is provided on the outside of the axial end of the stator winding. The oil spray ring is provided with an oil inlet and a cooling oil cavity connected to the oil inlet, and a plurality of oil spray holes connected to the cooling oil cavity are provided on a side of the oil spray ring facing the stator winding. The plurality of oil spray holes are provided at least at intervals along the circumference of the oil spray ring to spray the stator winding axially, and the vertical distance between the center of at least some of the oil spray holes and the axis of the stator winding is different, that is, the center of at least some of the oil spray holes is at different positions in the radial direction of the oil spray ring. When in use, the cooling oil enters the cooling oil cavity from the oil inlet, and is sprayed toward the stator winding along the axial direction of the stator winding through multiple oil spray holes, that is, the stator winding is sprayed with oil cooling along the axial direction of the stator winding through the oil spray ring. When spraying axially, the flow rate of the cooling oil after being sprayed out from each oil spray hole is basically equal. Compared with the solution of radial spraying of the stator winding by the oil spray ring in the prior art, the flow rate of the cooling oil after being sprayed out from the multiple oil spray holes of the oil spray ring of the stator assembly disclosed in the present invention is more uniform, and the cooling of the stator winding is more uniform, thereby improving the cooling effect and cooling efficiency of the stator winding. At the same time, since a plurality of oil injection holes are arranged at intervals along the circumference of the oil injection ring, and the hole centers of at least some of the oil injection holes are at different positions in the radial direction of the oil injection ring, the projection positions of at least some of the oil injection holes on the stator winding are distributed at different positions in the radial direction of the stator winding. In this way, the cooling oil can be sprayed along the axial direction of the stator winding to different positions in the radial direction of the stator winding, so that the distribution of the cooling oil on the stator winding is relatively uniform, thereby cooling the stator winding more evenly, and further improving the cooling effect and cooling efficiency of the stator winding. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0027] Figure 1 It is an isometric view of the stator assembly according to an embodiment of the present disclosure;

[0028] Figure 2 A side view of a stator assembly according to an embodiment of the present disclosure;

[0029] Figure 3 It is a partial structural schematic diagram of the stator assembly according to the embodiment of the present disclosure, wherein the oil injection hole is schematically shown;

[0030] Figure 4 It is an isometric view of a second ring body of an oil injection ring of a stator assembly according to an embodiment of the present disclosure;

[0031] Figure 5 It is an isometric view of the second ring body of the oil injection ring of the stator assembly according to the embodiment of the present disclosure from another perspective;

[0032] Figure 6 It is a structural schematic diagram of a first ring body of an oil injection ring of a stator assembly according to an embodiment of the present disclosure;

[0033] Figure 7 It is a structural schematic diagram of another perspective of the first ring body of the oil injection ring of the stator assembly according to the embodiment of the present disclosure;

[0034] Figure 8 It is a schematic diagram of the assembly of the oil injection ring and the housing of the stator assembly described in the embodiment of the present disclosure.

[0035] Among them, 1. stator core; 2. stator winding; 3. oil injection ring; 31. ring segment; 301. first ring body; 302. second ring body; 4. oil inlet; 5. oil groove; 6. oil injection hole; 7. connecting ear; 71. mounting hole; 8. shell. DETAILED DESCRIPTION

[0036] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0037] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0038] Embodiment 1

[0039] refer to Figures 1 to 8 As shown, this embodiment provides a stator assembly, which includes a stator core 1, a stator winding 2 and an oil injection ring 3.

[0040] Specifically, refer to Figures 1 to 3 As shown, the stator winding 2 is arranged in the stator core 1 and exposed outside the end of the stator core 1. Figure 1 The oil injection ring 3 is arranged on the side of the stator winding 2 away from the stator core 1, that is, the oil injection ring 3 is arranged on the outside of any axial end of the stator winding 2.

[0041] The oil injection ring 3 is provided with an oil inlet 4 and a cooling oil cavity connected to the oil inlet 4, and the cooling oil cavity is arranged along the circumference of the oil injection ring 3. A plurality of oil injection holes 6 connected to the cooling oil cavity are arranged on the side of the oil injection ring 3 facing the stator winding 2. The plurality of oil injection holes 6 are arranged at intervals at least along the circumference of the oil injection ring 3, and the position of the hole center of each oil injection hole 6 is located between the inner diameter and the outer diameter of the stator winding 2, so as to axially spray the stator winding 2. And the vertical distance between the hole center of at least some of the oil injection holes 6 and the axis of the stator winding 2 is different, that is, the position of the hole center of at least some of the oil injection holes 6 in the radial direction of the oil injection ring 3 is different, that is, the distance between the hole center of at least some of the oil injection holes 6 and the geometric center of the oil injection ring 3 is not equal.

[0042] In a specific implementation, the stator assembly can be disposed in a housing 8 of an oil-cooled motor, for example, wherein the oil injection ring 3 can be fixedly connected to the housing 8 , for example.

[0043] An oil supply port is usually provided at a position of the housing 8 corresponding to the oil inlet 4 , and the oil supply port on the housing 8 is coaxially arranged with the oil inlet 4 on the oil injection ring 3 and is sealed and connected.

[0044] In some implementations, the plurality of oil injection holes 6 may be arranged, for example, only at intervals along the circumference of the oil injection ring 3 on a surface of the oil injection ring 3 facing the stator winding 2 .

[0045] In other implementations, among the multiple fuel injection holes, some of the fuel injection holes are arranged at intervals along the circumference of the fuel injection ring, and some of the fuel injection holes are arranged at intervals along the radial direction of the fuel injection ring, thereby expanding the distribution range of the fuel injection holes in the radial direction of the fuel injection ring and making the axial spraying of the stator winding 2 more uniform.

[0046] It should be noted that when the motor is working, the position of the stator assembly in the housing will not change, that is, the position of the oil injection ring in the housing is fixed, and the position of the stator winding in the housing is fixed. Therefore, the relative position of the oil injection ring and the stator winding is fixed, and the relative position between the oil injection hole on the oil injection ring and the axis of the stator winding remains unchanged.

[0047] During specific use, the cooling oil enters the cooling oil chamber in the oil injection ring 3 through the oil inlet 4. Since the oil injection ring 3 is located on the outside of the axial end of the stator winding 2, and a plurality of oil injection holes 6 are provided on the side of the oil injection ring 3 facing the stator winding 2, and the positions of the hole centers of the plurality of oil injection holes 6 are all located between the inner diameter and the outer diameter of the stator winding 2, the cooling oil passes through the oil injection holes 6 and is sprayed on the stator winding 2 along the axial direction of the stator winding 2, that is, the axial spray is performed from the end of the stator winding 2. Since all the oil injection holes 6 are located on one side of the stator winding in the axial direction, compared with the radial spraying in the prior art, in which the cooling oil is accelerated under the action of gravity after being sprayed out from the upper oil injection hole, and the cooling oil is decelerated under the action of gravity after being sprayed out from the lower oil injection hole, resulting in uneven cooling of the stator winding, in this embodiment, the acceleration of gravity to which the cooling oil is subjected after being sprayed out from the oil injection holes 6 on the oil injection ring is roughly equal, so that the flow rate of the cooling oil after being sprayed out from each oil injection hole is roughly equal, that is, the flow rate of the oil injection holes 6 at different positions of the oil injection ring 3 after being sprayed out is relatively uniform, so that the cooling of the stator winding 2 is relatively uniform, thereby improving the cooling effect and cooling efficiency of the stator winding 2.

[0048] Furthermore, since a plurality of oil injection holes 6 are arranged at intervals along the circumference of the oil injection ring 3, and the positions of the hole centers of at least some of the oil injection holes 6 in the radial direction of the oil injection ring 3 are different, the projection positions of at least some of the oil injection holes 6 on the stator winding 2 are distributed at different positions in the radial direction of the stator winding 2. In this way, the cooling oil can be sprayed along the axial direction of the stator winding 2 to different positions in the radial direction of the stator winding 2, so that the distribution of the cooling oil on the stator winding 2 is relatively uniform, thereby cooling the stator winding 2 more uniformly, and further improving the cooling effect and cooling efficiency of the stator winding.

[0049] The stator assembly, oil-cooled motor and vehicle provided in this embodiment are provided with a stator core 1, a stator winding 2 and an oil spray ring 3, wherein the stator winding 2 is provided in the stator core 1 and exposed at the end of the stator core 1. The oil spray ring 3 is provided on the side of the stator winding 2 that is away from the stator core 1 in the axial direction of the stator winding 2, that is, the oil spray ring 3 is provided on the outside of the axial end of the stator winding 2. The oil spray ring 3 is provided with an oil inlet 4 and a cooling oil cavity connected to the oil inlet 4. A plurality of oil spray holes 6 connected to the cooling oil cavity are provided on the side of the oil spray ring 3 that faces the stator winding 2. The plurality of oil spray holes 6 are provided at least at intervals along the circumference of the oil spray ring 3 to spray the stator winding 2 axially, and the vertical distance between the hole center of at least some of the oil spray holes 6 and the axis of the stator winding 2 is different, that is, the position of the hole center of at least some of the oil spray holes 6 in the radial direction of the oil spray ring 3 is different. When in use, the cooling oil enters the cooling oil cavity from the oil inlet 4, and is sprayed toward the stator winding 2 along the axial direction of the stator winding 2 through the multiple oil spray holes 6, that is, the stator winding 2 is sprayed with oil cooling through the oil spray ring 3 along the axial direction of the stator winding 2. During axial spraying, the flow rate of the cooling oil after being sprayed from each oil spray hole 6 is substantially equal. Compared with the solution in the prior art that the oil spray ring 3 sprays the stator winding 2 radially, the flow rate of the cooling oil after being sprayed from the multiple oil spray holes 6 of the oil spray ring 3 of the stator assembly of this embodiment is relatively uniform, and the cooling of the stator winding 2 is relatively uniform, thereby improving the cooling effect and cooling efficiency of the stator winding 2. At the same time, since a plurality of oil injection holes 6 are arranged at intervals along the circumference of the oil injection ring 3, and the positions of the hole centers of at least some of the oil injection holes 6 in the radial direction of the oil injection ring 3 are different, the projection positions of at least some of the oil injection holes 6 on the stator winding 2 are distributed at different positions in the radial direction of the stator winding 2, so that the cooling oil can be sprayed along the axial direction of the stator winding 2 to different positions in the radial direction of the stator winding 2, so that the distribution of the cooling oil on the stator winding 2 is relatively uniform, thereby cooling the stator winding 2 more evenly, and further improving the cooling effect and cooling efficiency of the stator winding 2.

[0050] In some embodiments, the stator winding 2 has an axial section along the horizontal direction, referring to Figure 3 , Figure 6 , Figure 7 As shown, at least part of the oil injection holes 6 located above the axial section are arranged close to the outer ring of the stator winding 2, and at least part of the oil injection holes 6 located below the axial section are arranged close to the inner ring of the stator winding 2.

[0051] The stator winding 2 is usually an annular structure, the radius of the inner ring of the stator winding 2 is the inner diameter of the stator winding, and the radius of the outer ring of the stator winding 2 is the outer diameter of the stator winding.

[0052] It should be noted that the stator winding 2 has an axial section along the horizontal direction. Specifically, it can be understood that the stator winding 2 has an axial section parallel to the horizontal plane where the horizontal direction is located.

[0053] In a specific implementation, the oil injection hole 6 located above the axial section is arranged close to the outer ring of the stator winding 2, and the oil injection hole 6 located below the axial section is arranged close to the inner ring of the stator winding 2. This arrangement, on the one hand, facilitates the arrangement of multiple oil injection holes 6 at different radial positions of the oil injection ring to improve the cooling effect and efficiency of the stator winding 2. On the other hand, with the axial section as a reference, the cooling oil sprayed from the oil injection hole 6 above the axial section is sprayed toward the outer ring of the stator winding 2, and the cooling oil flows from the outer ring to the inner ring of the stator winding 2 under the action of gravity, and the cooling oil sprayed from the oil injection hole 6 below the axial section is sprayed toward the inner ring of the stator winding 2, and the cooling oil flows from the inner ring to the outer ring of the stator winding 2 under the action of gravity. On the basis of axial oil-cooling spraying of the stator winding 2 from its end, the contact area between the cooling oil sprayed from the oil injection holes 6 at different positions of the oil injection ring 3 and the stator winding 2 is larger, and the cooling oil can take away more heat during the flow process, so that the cooling of the stator winding 2 is more uniform, further ensuring the cooling effect and cooling efficiency.

[0054] Among them, the above-mentioned axial section can be coplanar with the axis of the stator winding 2, so that the circumferential arrangement position of the oil injection holes located above the axial section is roughly equal to the circumferential arrangement position of the oil injection holes located below the axial section, further ensuring the uniformity of spraying the stator winding.

[0055] refer to Figures 1 to 8 As shown, in some embodiments, the oil injection ring 3 includes at least two ring segments 31, and the at least two ring segments 31 are sealed and connected in sequence along the circumference of the stator winding 2, and the inner cavities of all the ring segments 31 are connected to form a cooling oil cavity. A plurality of oil injection holes 6 are arranged on the side of each ring segment 31 facing the stator winding 2, and the curvature radius of each ring segment 31 is located between the inner diameter and the outer diameter of the stator winding 2. The curvature radius of each ring segment 31 is different, refer to Figure 3 and Figure 6 As shown, the curvature radius R1 of the ring segment 31 located above the axial section is set close to the outer diameter of the stator winding 2, and the curvature radius R2 of the ring segment 31 located below the axial section is set close to the inner diameter of the stator winding 2, that is, the curvature radius R1 of the ring segment 31 located above the axial section is approximately equal to the outer diameter of the stator winding 2, and the curvature radius R2 of the ring segment 31 located below is approximately equal to the inner diameter of the stator winding 2.

[0056] The oil injection ring 3 is provided with a plurality of ring segments 31, the plurality of ring segments 31 are sequentially connected together along the circumference of the stator winding 2, and the inner cavities of the plurality of ring segments 31 are sealed and connected to form a cooling oil cavity. The curvature radius of each ring segment 31 is different, and the curvature radius of the ring segment 31 located above the axial section is substantially equal to the outer diameter of the stator winding 2, and the curvature radius of the ring segment 31 located below the axial section is substantially equal to the inner diameter of the stator winding 2. The structure is simple and easy to manufacture, so that the oil injection hole 6 located above the axial section can be relatively conveniently arranged close to the outer ring of the stator winding 2, and the oil injection hole 6 located below the axial section can be relatively conveniently arranged close to the inner ring of the stator winding 2, which reduces the difficulty of processing and assembling the oil injection ring 3 to a certain extent, and helps to improve work efficiency.

[0057] In specific implementation, the plurality of ring segments 31 can be integrally formed, for example, with good integrity, excellent sealing performance, and high structural strength. Of course, two adjacent ring segments 31 can also be connected together by welding, for example.

[0058] For example, reference Figures 2 to 7 As shown, the injection ring 3 includes two ring segments 31, and the ring segment 31 located above the axial section is defined as the upper ring segment, and the ring segment 31 located below the axial section is defined as the lower ring segment. Both ends of the upper ring segment and both ends of the lower ring segment are fixed and sealed. Among them, the curvature radius R1 of the upper ring segment is set close to the outer ring of the stator winding 2, so that the multiple injection holes 6 of the upper ring segment are all set close to the outer ring of the stator winding 2. The curvature radius R2 of the lower ring segment is set close to the inner ring of the stator winding 2, so that the multiple injection holes 6 of the lower ring segment are all set close to the inner ring of the stator winding 2. In specific implementation, refer to Figure 7 As shown, the angle between the curvature radii of the two injection holes at the bottom of the upper ring segment is α, which is greater than 150°α<180°. The angle between the curvature radii of the two injection holes at the top of the lower ring segment is β, which is greater than 150°β<180°.

[0059] In some embodiments, the junction of two adjacent ring segments 31 has a smooth transition and good aesthetics. At the same time, it can make the inner wall of the cooling oil cavity smoother, which is convenient for the smooth flow of cooling oil. To a certain extent, it can avoid the stress impact of the cooling oil on the inner wall of the cooling oil cavity at the junction of two adjacent ring segments 31, and the safety of use is better.

[0060] In specific implementation, for example, a rounded corner may be used to make the joint of two adjacent ring segments 31 smoothly transition.

[0061] refer to Figure 3 , Figures 6 to 8As shown, in some embodiments, some of the multiple oil injection holes 6 on each ring segment 31 are arranged at intervals along the arc direction of the ring segment 31, and some of the oil injection holes 6 are arranged at intervals along the radial direction of the ring segment 31, that is, the radial direction of the oil injection ring 3. This arrangement allows the oil injection holes 6 on each ring segment 31 to be arranged radially of the stator winding 2, that is, multiple circles of oil injection holes 6 can be provided on the oil injection ring 3, further increasing the distribution range of the oil injection holes in the radial direction of the oil injection ring, and making the axial spraying of the stator winding 2 more uniform, so that the oil injection ring 3 has a better cooling effect on the axial spraying of the stator winding 2, further ensuring the cooling effect and cooling efficiency of the axial spraying.

[0062] refer to Figures 4 to 7 As shown, in some embodiments, the oil injection ring 3 includes a first ring body 301 and a second ring body 302. The first ring body 301 and the second ring body 302 are coaxially arranged and sealed, and at least one of the first ring body 301 and the second ring body 302 is provided with an oil groove 5 for accommodating cooling oil, so as to enclose and form a cooling oil cavity when the first ring body 301 and the second ring body 302 are connected in place, and the structure is simple and easy to manufacture.

[0063] In some implementations, for example, an oil groove 5 may be provided on the first ring body 301, and the oil groove 5 is arranged on the first ring body 301 along the circumference of the first ring body 301, and the side of the oil groove 5 facing the second ring body 302 is open. A plurality of oil injection holes 6 are provided at the position of the second ring body 302 corresponding to the oil groove 5. When the first ring body 301 and the second ring body 302 are connected in place, the second ring body 302 can cover and seal the oil groove 5, that is, the oil groove 5 on the first ring body 301 and the side of the second ring body 302 facing the first ring body 301 together enclose a cooling oil cavity.

[0064] In some other implementations, an oil groove 5 is provided on the side of the first ring body 301 facing the second ring body 302, and an oil groove 5 is also provided on the side of the second ring body 302 facing the first ring body 301. The positions of the two oil grooves 5 correspond to each other, and a plurality of oil injection holes 6 are provided on the bottom of the oil groove 5 of the first ring body 301 or on the bottom of the oil groove 5 of the second ring body 302. When the first ring body 301 and the second ring body 302 are connected in place, the two oil grooves 5 together enclose a cooling oil chamber.

[0065] In some embodiments, the first ring body 301 and the second ring body 302 can be connected together by welding, for example, which has a simple structure and is easy to assemble.

[0066] In other embodiments, the first ring body 301 and the second ring body 302 may be sealed and connected together by gluing, for example.

[0067] Of course, the first ring body 301 and the second ring body 302 may also be integrally formed to form an integral structure of the fuel injection ring 3 .

[0068] In some embodiments, reference Figure 1 , Figure 2 and Figure 4 As shown, along the axial direction of the stator winding 2, the oil inlet 4 is arranged on one of the first ring body 301 and the second ring body 302 away from the stator winding 2, that is, the oil inlet 4 is arranged along the axial direction of the stator winding 2 on the side of the oil injection ring 3 away from the stator winding 2. In this way, on the one hand, the oil injection ring 3 is arranged along the axial direction of the cooling oil chamber, and the oil injection ring 3 can realize axial oil inlet, so that the cooling oil can be filled in the cooling oil chamber more evenly, which is convenient for axial spraying. On the other hand, the oil inlet 4 is arranged on the side of the oil injection ring 3 away from the stator winding 2, so that the oil inlet 4 and the oil injection hole 6 are arranged on the two opposite sides of the oil injection ring 3 in the axial direction, so that the cooling oil enters from the side of the oil injection ring 3 away from the stator winding 2, and is sprayed from the side of the oil injection ring 3 toward the stator winding 2, so that the speed of the cooling oil at the oil injection hole 6 is relatively large, so that the axial spraying effect is better.

[0069] Exemplarily, it is defined that the first ring body 301 is arranged toward the stator winding 2, and the second ring body 302 is arranged away from the stator winding 2, that is, the first ring body 301 is located between the second ring body 302 and the end of the stator winding 2. At this time, a plurality of oil injection holes 6 are arranged on the side of the first ring body 301 facing away from the second ring body 302, and in the axial direction along the stator winding 2, the oil injection ring 3 is arranged on the side of the second ring body 302 facing away from the first ring body 301.

[0070] refer to Figure 1 , Figure 2 and Figure 4 As shown, in some embodiments, the oil inlet 4 is arranged on the side of the oil injection ring 3 facing away from the stator winding 2 along the axial direction of the stator winding 2, so that axial oil inlet can be achieved and the axial spraying effect is better.

[0071] In some embodiments, there are two oil injection rings 3, and along the axial direction of the stator winding 2, both ends of the stator winding 2 are exposed outside the stator core 1, and the two oil injection rings 3 are respectively arranged at both ends of the stator winding 2 along the axial direction of the stator winding 2.

[0072] That is to say, both ends of the stator winding 2 are exposed on the outside of the stator core 1. By setting the two above-mentioned oil spray rings 3, the two oil spray rings 3 are respectively set on the side of the two ends of the stator winding 2 away from the stator core 1 along the axial direction of the stator winding 2. In this way, the two ends of the stator winding 2 can be axially sprayed respectively through the two oil spray rings 3, thereby further improving the cooling effect and cooling efficiency of the stator winding 2, so that the oil-cooled motor with the stator assembly of this embodiment has better heat dissipation performance.

[0073] refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 8 As shown, in some embodiments, at least two connecting ears 7 are provided on the fuel injection ring 3, and at least two connecting ears 7 are arranged on the outer ring wall of the fuel injection ring 3 at intervals along the circumference of the fuel injection ring 3, and each connecting ear 7 is provided with at least one mounting hole 71 connected to the shell 8, which has a simple structure and is convenient and stable to connect.

[0074] For example, reference Figure 1 and Figure 8 As shown, four connecting ears 7 are arranged on the outer ring wall of the fuel injection ring 3, and the four connecting ears 7 are arranged at intervals along the circumference of the fuel injection ring 3, and each connecting ear 7 is provided with a mounting hole 71. Specifically, the housing 8 is provided with connecting holes at positions corresponding to the four connecting ears 7, and one connecting hole corresponds to one mounting hole 71. The fuel injection ring 3 is fixed to the housing 8 by fasteners such as bolts penetrating the corresponding mounting holes 71 and the connecting holes.

[0075] Embodiment 2

[0076] This embodiment also provides an oil-cooled motor, which includes a housing 8 and a stator assembly disposed in the housing 8 .

[0077] In a specific implementation, the oil-cooled motor further includes a rotor assembly, which is coaxially mounted within the inner ring of the stator assembly and relatively fixed to the rotating shaft of the oil-cooled motor. In addition, the outer ring of the rotor assembly and the inner ring of the stator assembly should maintain a certain radial air gap, that is, the air gap between the stator and the rotor.

[0078] Specifically, the rotor assembly is coaxially installed within the inner circle of the stator core 1 .

[0079] The stator assembly in this embodiment has the same specific structure and implementation principle as the stator assembly provided in the above embodiment, and can bring the same or similar technical effects, which will not be described one by one here, and the details can be referred to the description of the above embodiment.

[0080] Embodiment 3

[0081] The present embodiment also provides a vehicle, which includes a stator assembly or an oil-cooled motor.

[0082] The stator assembly in this embodiment has the same specific structure and implementation principle as the stator assembly provided in the above embodiment, and can bring the same or similar technical effects, which will not be described one by one here, and the details can be referred to the description of the above embodiment.

[0083] The oil-cooled motor in this embodiment has the same specific structure and implementation principle as the oil-cooled motor provided in the above embodiment, and can bring the same or similar technical effects, which will not be described one by one here, and the details can be referred to the description of the above embodiment.

[0084] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0085] The above description is only a specific embodiment of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A stator assembly, It is characterized in that The stator assembly includes a stator core, a stator winding and an oil injection ring; The stator winding is arranged in the stator core and exposed outside the end of the stator core. Along the axial direction of the stator winding, the oil injection ring is arranged on the side of the stator winding away from the stator core; The oil injection ring is provided with an oil inlet and a cooling oil chamber connected with the oil inlet. A plurality of oil injection holes connected with the cooling oil chamber are provided on a side of the oil injection ring facing the stator winding. The plurality of oil injection holes are arranged at least at intervals along the circumference of the oil injection ring to axially spray the stator winding, and the vertical distances between the hole centers of at least some of the oil injection holes and the axis of the stator winding are different.

2. The stator assembly according to claim 1, It is characterized in that The stator winding has an axial section along the horizontal direction, at least part of the oil injection holes located above the axial section are arranged close to the outer ring of the stator winding, and at least part of the oil injection holes located below the axial section are arranged close to the inner ring of the stator winding.

3. The stator assembly according to claim 2, It is characterized in that The oil injection ring comprises at least two ring segments, at least two of the ring segments are sealed and connected in sequence along the circumference of the stator winding, and the inner cavities of all the ring segments are connected to form the cooling oil cavity; A plurality of oil injection holes are arranged on one side of each ring segment facing the stator winding, a radius of curvature of each ring segment is located between the inner diameter and the outer diameter of the stator winding, and a radius of curvature of the ring segment located above the axial section is set close to the outer diameter of the stator winding, while a radius of curvature of the ring segment located below the axial section is set close to the inner diameter of the stator winding.

4. The stator assembly according to claim 3, It is characterized in that The junction between two adjacent ring segments has a smooth transition.

5. The stator assembly according to claim 3, It is characterized in that The plurality of oil injection holes on each ring segment, some of the oil injection holes are arranged at intervals along the arc direction of the ring segment, and some of the oil injection holes are arranged at intervals along the radial direction of the ring segment.

6. The stator assembly according to claim 1, It is characterized in that The oil injection ring comprises a first ring body and a second ring body; The first ring body and the second ring body are coaxially arranged and sealedly connected. At least one of the first ring body and the second ring body is provided with an oil groove for accommodating cooling oil, so as to enclose and form the cooling oil cavity when the first ring body and the second ring body are connected in place.

7. The stator assembly according to claim 6, It is characterized in that The first ring body and the second ring body are welded together; And / or, along the axial direction of the stator winding, the oil inlet is arranged on one of the first ring body and the second ring body that is away from the stator winding.

8. The stator assembly according to claim 1, It is characterized in that Along the axial direction of the stator winding, the oil inlet is arranged on a side of the oil injection ring away from the stator winding.

9. The stator assembly according to any one of claims 1 to 8, It is characterized in that There are two oil injection rings, and along the axial direction of the stator winding, both ends of the stator winding are exposed outside the stator core, and the two oil injection rings are respectively arranged at both ends of the stator winding along the axial direction of the stator winding.

10. The stator assembly according to any one of claims 1 to 8, It is characterized in that At least two connecting ears are arranged on the oil injection ring, and at least two connecting ears are arranged on the outer ring wall of the oil injection ring at intervals along the circumference of the oil injection ring. Each connecting ear is provided with at least one mounting hole for connecting to the housing of the oil-cooled motor.

11. An oil-cooled motor, It is characterized in that The invention comprises a housing and a stator assembly according to any one of claims 1 to 8 arranged in the housing.

12. A vehicle, It is characterized in that The invention comprises the stator assembly according to any one of claims 1 to 8, or the oil-cooled motor according to claim 11.

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