Oil spray ring, stator assembly, oil-cooled electric motor and vehicle

Abstract

The present disclosure relates to an oil spray ring, a stator assembly, an oil-cooled electric motor and a vehicle. The oil spray ring comprises a first oil spray area and a second oil spray area, wherein the first oil spray area is located above the axis of the oil spray ring, and the second oil spray area is located below the axis of the oil spray ring; and each of the first oil spray area and the second oil spray area is provided with a plurality of oil spray holes, the distances between the centers of the oil spray holes located in the first oil spray area and the axis of the oil spray ring are first distances, the distances between the centers of the oil spray holes located in the second oil spray area and the axis of the oil spray ring are second distances, and at least some of the first distances are different from at least some of the second distances. In this way, the flow speed of oil sprayed from the oil spray ring in the first oil spray area located above and the flow speed of oil sprayed from the oil spray ring in the second oil spray area located below can be balanced, so that the flow speed of cooling oil sprayed from each oil spray hole of the whole oil spray ring is relatively uniform, and the cooling of a stator winding is relatively uniform, thereby improving the cooling effect and cooling efficiency for the stator winding.

Description

Oil spray ring, stator assembly, oil-cooled motor and vehicle

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on December 28, 2023, with application number 202323633460.1 and titled “Stator Assembly, Oil-Cooled Motor and Vehicle,” the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present disclosure relates to the field of vehicle technology, and in particular to an oil injection ring, a stator assembly, an oil-cooled motor, and a vehicle. Background Art

[0004] New energy vehicles have experienced rapid development in recent years, with major vehicle and parts manufacturers actively developing new energy vehicles and supporting equipment to meet market demand. As the power output device for new energy vehicles, electric motors are increasingly trending towards higher power density and higher speeds, making heat dissipation a more critical issue. This, in turn, places higher demands on motor cooling.

[0005] A motor typically consists of a housing housing a stator core and an oil spray ring. The stator core houses stator windings, which are exposed at the axial ends of the stator core. The oil spray ring, with multiple oil holes, surrounds the stator core and surrounds the stator windings. During motor operation, the stator winding ends typically reach a relatively high temperature. Cooling oil is sprayed through the oil holes onto the stator windings to cool them down.

[0006] However, in the prior art, the cooling oil flow rate after being sprayed out from the upper oil hole of the oil injection ring is usually greater than the cooling oil flow rate after being sprayed out from the lower oil hole, resulting in uneven cooling of the stator winding, poor cooling effect, and low cooling efficiency. Summary of the Invention

[0007] In order to solve the above technical problems, the present disclosure provides an oil injection ring, a stator assembly, an oil-cooled motor and a vehicle.

[0008] The present disclosure provides an oil injection ring, comprising a first oil injection area and a second oil injection area, wherein the first oil injection area is located above the axis of the oil injection ring, and the second oil injection area is located below the axis of the oil injection ring;

[0009] The first fuel injection area and the second fuel injection area are respectively provided with a plurality of fuel injection holes, the distance between the hole center of the fuel injection hole located in the first fuel injection area and the axis of the fuel injection ring is a first distance, and the distance between the hole center of the fuel injection hole located in the second fuel injection area and the axis of the fuel injection ring is a second distance, and at least part of the first distance is different from at least part of the second distance.

[0010] Optionally, a curvature radius of the first fuel injection area is greater than a curvature radius of the second fuel injection area.

[0011] Optionally, the fuel injection holes located in the first fuel injection area are arranged close to the outer circumference of the fuel injection ring, and the fuel injection holes located in the second fuel injection area are arranged close to the inner circumference of the fuel injection ring.

[0012] Optionally, the first oil spraying area and the second oil spraying area are both located on the end surface of the oil spraying ring perpendicular to the axis, and the end surface is used to face the end surface of the stator winding so that the oil spraying ring can axially spray the stator winding.

[0013] Optionally, at least some of the oil injection holes are arranged at intervals along the circumference of the oil injection ring, and / or at least some of the oil injection holes are arranged at intervals along the radial direction of the oil injection ring.

[0014] Optionally, the oil injection ring is provided with an oil inlet and a cooling oil cavity, and the oil inlet, the cooling oil cavity and the plurality of oil injection holes are connected.

[0015] Optionally, the oil injection ring includes a first ring body and a second ring body connected in the axial direction, and the first ring body and the second ring body enclose the cooling oil cavity;

[0016] The first oil injection area and the second oil injection area are arranged on one of the first ring body and the second ring body, and the oil inlet is arranged on the other of the first ring body and the second ring body.

[0017] Optionally, 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.

[0018] Optionally, at least two connecting ears are provided 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 circumferential direction. At least one mounting hole is provided on the connecting ear, and the mounting hole is used to connect with the housing of the oil-cooled motor.

[0019] The embodiment of the present application further discloses a stator assembly, which includes a stator core, a stator winding and the oil injection ring;

[0020] 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, and the first oil injection area and the second oil injection area of ​​the oil injection ring are arranged towards the end face of the stator winding.

[0021] Optionally, the stator winding has an axial section along the horizontal direction, the first oil injection area is located above the axial section, and the second oil injection area is located below the axial section;

[0022] At least some of the oil injection holes in the first oil injection area are arranged close to the outer periphery of the stator winding, and at least some of the oil injection holes in the second oil injection area are arranged close to the inner periphery of the stator winding.

[0023] Optionally, the curvature radius of the oil injection ring is located between the inner diameter and the outer diameter of the stator winding, the multiple oil injection holes of the first oil injection area and the second oil injection area are arranged toward the end face of the stator winding, and the curvature radius of the first oil injection area is set close to the outer diameter of the stator winding, and the curvature radius of the second oil injection area is set close to the inner diameter of the stator winding.

[0024] Optionally, there are two oil spray 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 spray rings are respectively arranged at both ends of the stator winding along the axial direction of the stator winding.

[0025] The embodiment of the present application also discloses an oil-cooled motor, comprising a housing and the stator assembly or the oil spray ring disposed in the housing.

[0026] An embodiment of the present application also discloses a vehicle, comprising the oil-cooled motor, the stator assembly, or the oil injection ring as described above.

[0027] The technical solution provided by the embodiments of the present disclosure has the following advantages over the prior art:

[0028] The present disclosure provides an oil spray ring, stator assembly, oil-cooled motor, and vehicle. The oil spray ring includes a first oil spray area and a second oil spray area. The first oil spray area is located above the axis of the oil spray ring, and the second oil spray area is located below the axis of the oil spray ring. Each of the first and second oil spray areas is provided with a plurality of oil spray holes. The distance between the center of the oil spray hole in the first oil spray area and the axis of the oil spray ring is a first distance, and the distance between the center of the oil spray hole in the second oil spray area and the axis of the oil spray ring is a second distance. At least a portion of the first distance is different from at least a portion of the second distance. Specifically, the oil spray ring contains cooling oil, which is sprayed from the oil spray ring to cool the stator windings. In an embodiment of the present application, the distance between the center of the oil injection holes located at least partially in the first oil injection area and the axis of the oil injection ring is a first distance, which is different from the distance between the center of the oil injection holes located at least partially in the second oil injection area and the axis of the oil injection ring is a second distance. This balances the flow rate of the oil sprayed from the oil injection ring located in the upper first oil injection area and the flow rate of the oil sprayed from the oil injection ring located in the lower second oil injection area, so that the flow rate of the cooling oil sprayed from each oil injection hole of the entire oil injection ring is relatively uniform, and the cooling of the stator winding is relatively uniform, thereby improving the cooling effect and cooling efficiency of the stator winding. The difference between the flow rate of the cooling oil sprayed from the upper oil hole and the flow rate of the cooling oil sprayed from the lower oil hole of the oil injection ring in the prior art is reduced, so that the cooling of the stator winding is relatively uniform, and the cooling effect and cooling efficiency are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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.

[0030] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0031] FIG1 is an isometric view of a stator assembly according to an embodiment of the present disclosure;

[0032] FIG2 is a side view of the stator assembly according to an embodiment of the present disclosure;

[0033] FIG3 is a schematic diagram of a partial structure of a stator assembly according to an embodiment of the present disclosure, wherein an oil injection hole is schematically shown;

[0034] FIG4 is an isometric view of a first ring body of an oil injection ring of a stator assembly according to an embodiment of the present disclosure;

[0035] FIG5 is an isometric view of the first ring body of the oil injection ring of the stator assembly according to an embodiment of the present disclosure from another perspective;

[0036] FIG6 is a schematic structural diagram of a second ring body of an oil injection ring of a stator assembly according to an embodiment of the present disclosure;

[0037] FIG7 is a schematic structural diagram of the second ring body of the oil injection ring of the stator assembly according to an embodiment of the present disclosure from another perspective;

[0038] FIG8 is a schematic diagram of the assembly of the oil injection ring and the housing of the stator assembly according to the embodiment of the present disclosure.

[0039] Among them, 1. stator core; 2. stator winding; 3. oil injection ring; 31. ring segment; 301. first ring body; 302. second ring body; 303. first oil injection area; 304. second oil injection area; 4. oil inlet; 5. oil tank; 6. oil injection hole; 7. connecting ear; 71. mounting hole; 8. shell. Specific embodiments

[0040] 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 therein can be combined with each other in the absence of conflict.

[0041] 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.

[0042] Example 1

[0043] 3 to 7 , this embodiment provides an oil injection ring. The oil injection ring 3 includes a first oil injection area 303 and a second oil injection area 304 . The first oil injection area 303 is located above the axis of the oil injection ring 3 , and the second oil injection area 304 is located below the axis of the oil injection ring 3 .

[0044] The first fuel injection area 303 and the second fuel injection area 304 are respectively provided with multiple fuel injection holes 6. The distance between the hole center of the fuel injection hole 6 located in the first fuel injection area 303 and the axis of the fuel injection ring 3 is a first distance, and the distance between the hole center of the fuel injection hole 6 located in the second fuel injection area 304 and the axis of the fuel injection ring 3 is a second distance. At least part of the first distance is different from at least part of the second distance.

[0045] Specifically, the oil spray ring 3 contains cooling oil, which is sprayed from the oil spray ring 3 to cool the stator winding 2. In the embodiment of the present application, the distance between the center of the oil spray holes 6 located at least partially in the first oil spray area 303 and the axis of the oil spray ring 3 is a first distance, which is different from the distance between the center of the oil spray holes 6 located at least partially in the second oil spray area 304 and the axis of the oil spray ring 3 is a second distance. This balances the flow rate of the oil sprayed from the oil spray ring 3 in the upper first oil spray area 303 and the flow rate of the oil sprayed from the oil spray ring 3 in the lower second oil spray area 304, resulting in a more uniform flow rate of the cooling oil sprayed from each oil spray hole 6 throughout the oil spray ring 3, and thus more uniformly cools the stator winding 2, thereby improving the cooling effect and efficiency of the stator winding 2. The difference between the cooling oil flow rate after the oil injection ring 3 is sprayed from the upper oil hole and the cooling oil flow rate after the oil injection ring 3 is sprayed from the lower oil hole in the prior art is reduced, so that the cooling of the stator winding 2 is more uniform, and the cooling effect and cooling efficiency are improved.

[0046] For example, the first distance can be the vertical distance between the center of the injection hole 6 located in the first injection area 303 and the axis of the injection ring 3, or it can be a non-vertical distance, and this embodiment of the present application is not limited to this. Similarly, the second distance can be the vertical distance between the center of the injection hole 6 located in the second injection area 304 and the axis of the injection ring 3, or it can be a non-vertical distance, and this embodiment of the present application is not limited to this.

[0047] Optionally, in the embodiment of the present application, the curvature radius of the first oil injection area 303 is greater than the curvature radius of the second oil injection area 304. Thus, by limiting the velocity of the oil sprayed from the oil injection holes 6 with different curvature radii, the velocity difference between the oil sprayed from the oil injection ring 3 located in the upper first oil injection area 303 and the oil sprayed from the oil injection ring 3 located in the lower second oil injection area 304 is further shortened, thereby improving the uniformity of the cooling oil spray.

[0048] In the embodiment of the present application, the oil injection holes 6 in the first oil injection area 303 are optionally arranged near the outer periphery of the oil injection ring 3, and the oil injection holes 6 in the second oil injection area 304 are arranged near the inner periphery of the oil injection ring 3. This arrangement, on the one hand, facilitates the arrangement of multiple oil injection holes 6 at different radial positions of the oil injection ring, thereby improving the cooling effect and efficiency of the stator winding 2. On the other hand, with the axis of the oil spray ring 3 as a reference, the cooling oil sprayed from the oil spray holes 6 of the upper first oil spray area 303 can be 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 spray holes 6 of the lower second oil spray area 304 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 spray holes 6 at different positions of the oil spray 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.

[0049] Optionally, in the embodiment of the present application, the first and second oil spraying zones 303, 304 are both located on the end surface of the oil spray ring 3 perpendicular to the axis, with the end surface facing the end surface of the stator winding 2, so that the oil spray ring 3 sprays the stator winding 2 axially. This allows the oil spray ring 3 to spray the end surface of the stator winding 2 axially, cooling the stator winding 2 over a wider area and improving the cooling effect. Furthermore, the first and second oil spraying zones 303, 304 can also be located on the side surface of the oil spray ring 3 parallel to the axis, spraying the stator winding 2 radially.

[0050] In the embodiment of the present application, optionally, at least some of the oil injection holes 6 are arranged at intervals along the circumference of the oil injection ring 3, and / or, at least some of the oil injection holes 6 are arranged at intervals along the radial direction of the oil injection ring 3. In this way, the oil injection ring 3 sprays oil-cooling on the stator winding 2 at multiple positions along the circumference of the stator winding 2, or the oil injection holes 6 spray oil-cooling on the stator winding 2 at different positions in the radial direction of the oil injection ring 3. In addition, it is also possible to arrange some of the oil injection holes 6 at intervals along the circumference of the oil injection ring 3, and some of the oil injection holes 6 at intervals along the radial direction of the oil injection ring 3, so that the oil injection ring 3 sprays oil-cooling on the stator winding 2 at multiple positions along the circumference of the stator winding 2, and at the same time, sprays oil-cooling on the stator winding 2 at different positions in the radial direction of the oil injection ring 3, further improving the all-round and multi-position cooling of the stator winding 2 and improving the cooling effect.

[0051] Optionally, in the embodiment of the present application, the oil injection ring 3 is provided with an oil inlet 4 and a cooling oil cavity, and the oil inlet 4, the cooling oil cavity, and the plurality of oil injection holes 6 are connected. In this way, cooling oil can be introduced through the oil inlet 4, and the cooling oil can be transmitted to each oil injection hole 6 through the cooling oil cavity, thereby achieving circulation of the cooling oil within the oil injection ring 3.

[0052] In the embodiment of the present application, the oil injection ring 3 optionally includes a first ring body 301 and a second ring body 302 connected in an axial direction, wherein the first ring body 301 and the second ring body 302 enclose a cooling oil cavity; the first oil injection area 303 and the second oil injection area 304 are provided on one of the first ring body 301 and the second ring body 302, and the oil inlet 4 is provided on the other of the first ring body 301 and the second ring body 302. For example, the first ring body 301 and the second ring body 302 can be coaxially arranged and sealed to enclose a cooling oil cavity when the first ring body 301 and the second ring body 302 are connected in place. The structure is simple and easy to manufacture.

[0053] Optionally, in an embodiment of the present application, 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. For example, an oil groove 5 can 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 positions 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.

[0054] In 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 the bottom of the oil groove 5 of the second ring body 302. In this way, 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 cavity.

[0055] In some embodiments, the first ring body 301 and the second ring body 302 can be connected together by welding, for example, which provides a simple structure and facilitates assembly. In other embodiments, the first ring body 301 and the second ring body 302 can be sealed together by gluing, for example. Furthermore, the first ring body 301 and the second ring body 302 can also be integrally molded to form a one-piece fuel injection ring 3, which is not limited in this embodiment of the present application.

[0056] Optionally, in an embodiment of the present application, the fuel injection ring 3 is provided with at least two connecting ears 7, which are circumferentially spaced apart on the outer ring wall of the fuel injection ring 3. The connecting ears 7 are provided with at least one mounting hole 71, which is used to connect to the housing 8 of the oil-cooled motor. For example, referring to Figures 1 and 8, four connecting ears 7 are provided on the outer ring wall of the fuel injection ring 3, which are spaced apart 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, with one connecting hole corresponding to one mounting hole 71. The fuel injection ring 3 is fixed to the housing 8 by fasteners, such as bolts, which are inserted through the corresponding mounting holes 71 and the connecting holes.

[0057] Example 2

[0058] 1 to 8 , this embodiment provides a stator assembly, which includes a stator core 1 , a stator winding 2 , and an oil injection ring 3 .

[0059] Specifically, as shown in Figures 1 to 3 , the stator winding 2 is disposed within the stator core 1 and is exposed outside the end of the stator core 1. An oil spray ring 3 is disposed on the side of the stator winding 2 facing away from the stator core 1 in the axial direction of the stator winding 2 (see the X direction in Figure 1 ). Specifically, the oil spray ring 3 is disposed outside either axial end of the stator winding 2. The first and second oil spray zones of the oil spray ring are positioned toward the end faces of the stator winding, allowing the cooling oil sprayed from the oil spray ring to cool the end faces of the stator winding.

[0060] The oil injection ring 3 is provided with an oil inlet 4 and a cooling oil chamber connected to the oil inlet 4. The cooling oil chambers are arranged along the circumference of the oil injection ring 3. The surface of the oil injection ring 3 facing the stator winding 2 is provided with multiple oil injection holes 6 connected to the cooling oil chambers. The multiple oil injection holes 6 are spaced at least along the circumference of the oil injection ring 3, and the center of each oil injection hole 6 is located between the inner and outer diameters of the stator winding 2 to provide axial spraying of the stator winding 2. Furthermore, the vertical distance between the center of at least some of the oil injection holes 6 and the axis of the stator winding 2 is different. In other words, the center of at least some of the oil injection holes 6 is located at different positions in the radial direction of the oil injection ring 3, that is, the distance between the center of at least some of the oil injection holes 6 and the geometric center of the oil injection ring 3 is unequal.

[0061] In a specific implementation, the stator assembly can be arranged 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.

[0062] 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 in sealed communication with each other.

[0063] 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 .

[0064] In other implementations, among the multiple oil injection holes, some of the oil injection holes are arranged at intervals along the circumference of the oil injection ring, and some of the oil injection holes are arranged at intervals along the radial direction of the oil injection ring, thereby expanding 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.

[0065] 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.

[0066] During specific use, the cooling oil enters the cooling oil chamber in the oil spray ring 3 through the oil inlet 4. Since the oil spray ring 3 is located outside the axial end of the stator winding 2, and a plurality of oil spray holes 6 are provided on the side of the oil spray ring 3 facing the stator winding 2, and the positions of the hole centers of the plurality of oil spray 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 spray holes 6 and is sprayed on the stator winding 2 in the axial direction of the stator winding 2, that is, axial spraying is performed from the end of the stator winding 2. Since all the oil spray 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 by gravity after being sprayed from the upper oil spray hole, and the cooling oil is decelerated by gravity after being sprayed from the lower oil spray hole, resulting in uneven cooling of the stator winding, the acceleration of gravity to which the cooling oil is subjected after being sprayed from the oil spray holes 6 on the oil spray ring of this embodiment is roughly equal, so that the flow rate of the cooling oil after being sprayed from each oil spray hole is roughly equal. In other words, the flow rate of the oil spray holes 6 at different positions of the oil spray ring 3 after being sprayed is relatively uniform, so that the stator winding 2 is cooled more evenly, thereby improving the cooling effect and cooling efficiency of the stator winding 2.

[0067] Furthermore, since the plurality of oil injection holes 6 are arranged at intervals along the circumference of the oil injection ring 3, and the centers of at least some of the oil injection holes 6 are at different positions in the radial direction of the oil injection ring 3, 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 evenly, and further improving the cooling effect and cooling efficiency of the stator winding.

[0068] The stator assembly, oil-cooled motor, and vehicle provided in this embodiment comprise a stator core 1, a stator winding 2, and an oil spray ring 3. The stator winding 2 is disposed within the stator core 1 and exposed at the end of the stator core 1. The oil spray ring 3 is disposed axially on the side of the stator winding 2 facing away from the stator core 1, i.e., the oil spray ring 3 is disposed outside 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. The surface of the oil spray ring 3 facing the stator winding 2 is provided with a plurality of oil spray holes 6 connected to the cooling oil cavity. The plurality of oil spray holes 6 are spaced at least circumferentially around the oil spray ring 3 to provide axial spraying of the stator winding 2. The centers of at least some of the oil spray holes 6 are positioned at different vertical distances from the axis of the stator winding 2. In other words, the centers of at least some of the oil spray holes 6 are positioned at different radial locations on the oil spray ring 3. During use, cooling oil enters the cooling oil chamber through the oil inlet 4 and is sprayed toward the stator winding 2 axially through the multiple oil spray holes 6. This means that the stator winding 2 is subjected to oil-cooling spraying axially through the oil spray ring 3. During axial spraying, the flow rate of the cooling oil after being sprayed from each oil spray hole 6 is substantially equal. Compared to the prior art solution in which the oil spray ring 3 sprays the stator winding 2 radially, the flow rate of the cooling oil sprayed from the multiple oil spray holes 6 of the oil spray ring 3 of the stator assembly of this embodiment is more uniform, resulting in more uniform cooling of the stator winding 2, thereby improving the cooling effect and efficiency of the stator winding 2. At the same time, since the plurality of oil injection holes 6 are arranged at intervals along the circumference of the oil injection ring 3, and the hole centers of at least some of the oil injection holes 6 are at different positions in the radial direction of the oil injection ring 3, 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 evenly, and further improving the cooling effect and cooling efficiency of the stator winding 2.

[0069] In some embodiments, the stator winding 2 has an axial section along the horizontal direction. Referring to Figures 3, 6, and 7, at least some 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 some of the oil injection holes 6 located below the axial section are arranged close to the inner ring of the stator winding 2.

[0070] 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.

[0071] 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.

[0072] In a specific implementation, the oil injection holes 6 located above the axial section are arranged close to the outer ring of the stator winding 2, and the oil injection holes 6 located below the axial section are 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 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.

[0073] 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.

[0074] As shown in Figures 1 to 8 , in some embodiments, the oil injection ring 3 includes at least two ring segments 31, which are sealed and connected in sequence along the circumference of the stator winding 2. The inner cavities of all ring segments 31 are connected to form a cooling oil chamber. Each ring segment 31 is provided with a plurality of oil injection holes 6 on the side facing the stator winding 2. The radius of curvature of each ring segment 31 is located between the inner and outer diameters of the stator winding 2. The radius of curvature of each ring segment 31 varies. As shown in Figures 3 and 6 , the radius of curvature R1 of the ring segment 31 located at the top of the axial cross-section is close to the outer diameter of the stator winding 2, while the radius of curvature R2 of the ring segment 31 located at the bottom of the axial cross-section is close to the inner diameter of the stator winding 2. That is, the radius of curvature R1 of the ring segment 31 located at the top of the axial cross-section is approximately equal to the outer diameter of the stator winding 2, while the radius of curvature R2 of the ring segment 31 located at the bottom of the axial cross-section is approximately equal to the inner diameter of the stator winding 2.

[0075] By configuring the oil injection ring 3 as a plurality of ring segments 31, the plurality of ring segments 31 are sequentially connected 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 chamber. Each ring segment 31 has a different radius of curvature, and the radius of curvature of the ring segment 31 located above the axial cross-section is approximately equal to the outer diameter of the stator winding 2, while the radius of curvature of the ring segment 31 located below the axial cross-section is approximately equal to the inner diameter of the stator winding 2. This results in a simple structure and ease of manufacture. This allows the oil injection holes 6 located above the axial cross-section to be conveniently positioned close to the outer ring of the stator winding 2, while the oil injection holes 6 located below the axial cross-section can be conveniently positioned close to the inner ring of the stator winding 2. This reduces the difficulty of machining and assembling the oil injection ring 3 to a certain extent, thereby improving work efficiency.

[0076] 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.

[0077] For example, referring to Figures 2 to 7 , the oil injection ring 3 includes two ring segments 31 . The ring segment 31 located above the axial cross-section is defined as the upper ring segment, and the ring segment 31 located below the axial cross-section is defined as the lower ring segment. Both ends of the upper ring segment and the lower ring segment are fixed and sealed. The curvature radius R1 of the upper ring segment is positioned close to the outer ring of the stator winding 2, so that the multiple oil injection holes 6 of the upper ring segment are all positioned close to the outer ring of the stator winding 2. The curvature radius R2 of the lower ring segment is positioned close to the inner ring of the stator winding 2, so that the multiple oil injection holes 6 of the lower ring segment are all positioned close to the inner ring of the stator winding 2. In a specific implementation, referring to Figure 7 , the angle between the curvature radii at the center of the two oil injection holes at the bottom of the upper ring segment is α, which is greater than 150° and α is less than 180°. The angle between the curvature radii at the center of the two oil injection holes at the top of the lower ring segment is β, which is greater than 150° and β is less than 180°.

[0078] 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 facilitates the smooth flow of cooling oil. To a certain extent, it can avoid the cooling oil from generating stress impact on the inner wall of the cooling oil cavity at the junction of two adjacent ring segments 31, and has better safety in use.

[0079] In specific implementation, for example, a rounded corner method may be adopted to achieve a smooth transition between the joints of two adjacent ring segments 31 .

[0080] 3 and 6 to 8 , in some embodiments, of the multiple oil injection holes 6 on each ring segment 31, some of the oil injection holes 6 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 radial distribution range of the oil injection holes in the oil injection ring, making the axial spraying of the stator winding 2 more uniform, thereby making the oil injection ring 3 have 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.

[0081] 4 to 7 , 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 together. 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. When the first ring body 301 and the second ring body 302 are connected in place, they enclose a cooling oil cavity. The structure is simple and easy to manufacture.

[0082] In some implementations, for example, an oil groove 5 may be provided on the first ring body 301. The oil groove 5 is arranged 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 on the second ring body 302 at positions corresponding to the oil groove 5. When the first and second ring bodies 301 and 302 are connected, 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 form a cooling oil chamber.

[0083] In 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 the bottom of the oil groove 5 of the second ring body 302. In this way, 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 cavity.

[0084] 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.

[0085] In other embodiments, the first ring body 301 and the second ring body 302 may be sealed together by gluing, for example.

[0086] Of course, the first ring body 301 and the second ring body 302 may also be integrally formed to form the fuel injection ring 3 of an integral structure.

[0087] In some embodiments, as shown in Figures 1, 2, and 4, the oil inlet 4 is disposed axially along the stator winding 2 on one of the first and second ring bodies 301 and 302 that faces away from the stator winding 2. Specifically, the oil inlet 4 is disposed axially along the stator winding 2 on the side of the oil injection ring 3 that faces away from the stator winding 2. This arrangement, on the one hand, allows the oil injection ring 3 to be disposed axially along the cooling oil chamber, enabling axial oil inflow, allowing the cooling oil to be more evenly distributed within the cooling oil chamber and facilitating axial spraying. On the other hand, the oil inlet 4 is disposed on the side of the oil injection ring 3 that faces away from the stator winding 2. Thus, the oil inlet 4 and the oil injection hole 6 are disposed on opposite sides of the oil injection ring 3 in the axial direction. This allows the cooling oil to enter the oil injection ring 3 from the side facing away from the stator winding 2 and be sprayed from the side facing the stator winding 2. This results in a higher velocity of the cooling oil at the oil injection hole 6, resulting in a better axial spraying effect.

[0088] For example, 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 provided 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 provided on the side of the second ring body 302 facing away from the first ring body 301.

[0089] 1 , 2 and 4 , 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.

[0090] In some embodiments, there are two oil injection rings 3. Along the axial direction of the stator winding 2, both ends of the stator winding 2 are exposed outside the stator core 1. 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.

[0091] That is to say, both ends of the stator winding 2 are exposed on the outside of the stator core 1. By providing the two above-mentioned oil spray rings 3, the two oil spray rings 3 are respectively provided 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, axial spraying can be achieved on the two ends of the stator winding 2 through the two oil spray rings 3, thereby further improving the cooling effect and cooling efficiency of the stator winding 2, so that the heat dissipation performance of the oil-cooled motor with the stator assembly of this embodiment is better.

[0092] Referring to Figures 1, 2, 3, 4 and 8, 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. Each connecting ear 7 is provided with at least one mounting hole 71 connected to the housing 8, which has a simple structure and is convenient and stable to connect.

[0093] For example, referring to Figures 1 and 8 , the outer wall of the fuel injection ring 3 is provided with four connecting lugs 7. These lugs 7 are spaced apart circumferentially around the fuel injection ring 3, and each lug 7 has a mounting hole 71. Specifically, the housing 8 is provided with connecting holes at positions corresponding to the four connecting lugs 7, with one connecting hole corresponding to one mounting hole 71. The fuel injection ring 3 is secured to the housing 8 using fasteners, such as bolts, that penetrate the corresponding mounting holes 71 and the connecting holes.

[0094] Example 3

[0095] This embodiment further provides an oil-cooled motor, which includes a housing 8 and a stator assembly disposed in the housing 8 .

[0096] In a specific implementation, the oil-cooled motor also includes a rotor assembly, which is coaxially mounted within the inner ring of the stator assembly and fixed relative to the oil-cooled motor's rotating shaft. Furthermore, a certain radial air gap should be maintained between the outer ring of the rotor assembly and the inner ring of the stator assembly, i.e., the air gap between the stator and rotor.

[0097] Specifically, the rotor assembly is coaxially installed within the inner ring of the stator core 1 .

[0098] 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. They will not be described one by one here, and the details can be referred to the description of the above embodiment.

[0099] Example 4

[0100] This embodiment also provides a vehicle, which includes a stator assembly or an oil-cooled motor.

[0101] 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. They will not be described one by one here, and the details can be referred to the description of the above embodiment.

[0102] 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. They will not be described one by one here, and the details can be referred to the description of the above embodiment.

[0103] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0104] The foregoing description is intended only to provide specific embodiments of the present disclosure, intended to enable those skilled in the art to understand and implement the present disclosure. Various modifications to these embodiments will be readily 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 is not intended to be limited to the embodiments described herein, but rather to be construed in the broadest manner consistent with the principles and novel features disclosed herein.

Claims

1. An oil injection ring, comprising a first oil injection area and a second oil injection area, wherein the first oil injection area is located above the axis of the oil injection ring, and the second oil injection area is located below the axis of the oil injection ring; The first fuel injection area and the second fuel injection area are respectively provided with a plurality of fuel injection holes, the distance between the hole center of the fuel injection hole in the first fuel injection area and the axis of the fuel injection ring is a first distance, the distance between the hole center of the fuel injection hole in the second fuel injection area and the axis of the fuel injection ring is a second distance, and at least part of the first distance is different from at least part of the second distance.

2. The fuel injection ring according to claim 1, wherein, The curvature radius of the first fuel injection area is greater than the curvature radius of the second fuel injection area.

3. The fuel injection ring according to claim 1 or 2, wherein, The fuel injection holes located in the first fuel injection area are arranged close to the outer circumference of the fuel injection ring, and the fuel injection holes located in the second fuel injection area are arranged close to the inner circumference of the fuel injection ring.

4. The fuel injection ring according to any one of claims 1 to 3, wherein The first oil injection area and the second oil injection area are both located at the end surface of the oil injection ring perpendicular to the axis, and the end surface is used to face the end surface of the stator winding so that the oil injection ring can axially spray the stator winding.

5. The fuel injection ring according to any one of claims 1 to 4, wherein, At least part of the oil injection holes are arranged at intervals along the circumferential direction of the oil injection ring, and / or at least part of the oil injection holes are arranged at intervals along the radial direction of the oil injection ring.

6. The fuel injection ring according to any one of claims 1 to 5, wherein, The oil injection ring is provided with an oil inlet and a cooling oil cavity, and the oil inlet, the cooling oil cavity and the plurality of oil injection holes are in communication.

7. The fuel injection ring according to claim 6, wherein, The oil injection ring comprises a first ring body and a second ring body connected in the axial direction, wherein the first ring body and the second ring body enclose the cooling oil cavity; The first oil injection area and the second oil injection area are arranged on one of the first ring body and the second ring body, and the oil inlet is arranged on the other of the first ring body and the second ring body.

8. The fuel injection ring according to claim 7, wherein, 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.

9. The fuel injection ring according to any one of claims 1 to 8, wherein, The oil injection ring is provided with at least two connecting ears, and at least two connecting ears are circumferentially spaced apart on the outer ring wall of the oil injection ring. The connecting ear is provided with at least one mounting hole, and the mounting hole is used to connect with the housing of the oil-cooled motor.

10. A stator assembly, comprising a stator core, a stator winding and an oil injection ring according to any one of claims 1 to 9; 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, and the first oil injection area and the second oil injection area of ​​the oil injection ring are arranged toward the end face of the stator winding.

11. The stator assembly according to claim 10, wherein, The stator winding has an axial section along the horizontal direction, the first injection area is located above the axial section, and the second injection area is located below the axial section; At least part of the injection holes of the first injection area are arranged close to the outer periphery of the stator winding, and at least part of the injection holes of the second injection area are arranged close to the inner periphery of the stator winding.

12. The stator assembly according to claim 11, wherein: The curvature radius of the fuel injection ring is located between the inner diameter and the outer diameter of the stator winding. A plurality of fuel injection holes in the first fuel injection area and the second fuel injection area are arranged towards the end face of the stator winding, and the curvature radius of the first fuel injection area is arranged close to the outer diameter of the stator winding, and the curvature radius of the second fuel injection area is arranged close to the inner diameter of the stator winding.

13. The stator assembly according to any one of claims 10 to 12, wherein, There are two fuel injection rings. Along the axial direction of the stator winding, both ends of the stator winding are exposed outside the stator core, and the two fuel injection rings are respectively arranged at both ends of the stator winding along the axial direction of the stator winding.

14. An oil-cooled motor, comprising a housing and a stator assembly as described in any one of claims 10 to 13 provided in the housing, or a fuel injection ring as described in any one of claims 1 to 10.

15. A vehicle, comprising the oil-cooled motor as described in claim 14, or a stator assembly as described in any one of claims 10 to 13, or a fuel injection ring as described in any one of claims 1 to 9.

Images