A motor oil cooling system

Abstract

The present application discloses an oil cooling system for a motor, comprising: a first bearing; a second bearing disposed opposite to the first bearing; and a central shaft including a first end and a second end opposite to the first end, the first end being disposed in the first bearing, the second end being disposed in the second bearing, a cavity being provided in the central shaft, and an oil inlet hole communicating with the cavity being provided at the first end; wherein, a first oil outlet hole communicating with the cavity is provided at a position adjacent to the first end of the central shaft, and the opening of the first oil outlet hole faces the direction of the first bearing; a second oil outlet hole communicating with the cavity is provided at a position adjacent to the second end of the central shaft, and the opening of the second oil outlet hole faces the direction of the second bearing. For the above-mentioned oil cooling system for a motor, the cooling oil can be sprayed from the first oil outlet hole towards the first bearing and from the second oil outlet hole towards the second bearing, so as to directly cool the first bearing and the second bearing actively, and the cooling oil sprayed to the first bearing and the second bearing is not easy to accumulate, thereby improving the cooling effect on the bearings.

Description

Technical Field

[0001] This application belongs to the technical field of motor cooling, and particularly relates to a motor oil cooling system. Background Art

[0002] With the continuous upgrading of new energy vehicle technology, new energy vehicles have higher and higher requirements for the rotational speed of drive motors, and at the same time, the cooling demand for motors is also increasing. In related technologies, oil outlet holes are opened in a hollow central shaft to cool the rotor, but the bearings cannot be actively cooled by oil, or the cooling oil distributed to the bearings is prone to accumulation, resulting in a decrease in heat exchange efficiency, which is not conducive to cooling the bearings and leads to poor cooling effect at the bearings.

[0003] It should be noted that the information disclosed in the above background art section is only used to strengthen the understanding of the background of the present disclosure, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0004] This application aims to at least solve to some extent the technical problem of poor cooling effect at the motor rotor bearings. For this purpose, this application provides a motor oil cooling system.

[0005] A motor oil cooling system provided by an embodiment of this application, the motor oil cooling system includes: a first bearing; a second bearing, the second bearing is disposed opposite to the first bearing; and a central shaft, the central shaft includes a first end and a second end opposite to the first end, the first end is disposed in the first bearing, the second end is disposed in the second bearing, a cavity is provided in the central shaft, and an oil inlet hole communicating with the cavity is opened at the first end; wherein, a first oil outlet hole communicating with the cavity is opened at a position adjacent to the first end of the central shaft, and the opening of the first oil outlet hole faces the direction of the first bearing; a second oil outlet hole communicating with the cavity is opened at a position adjacent to the second end of the central shaft, and the opening of the second oil outlet hole faces the direction of the second bearing.

[0006] In some embodiments, the included angle between the opening direction of the first oil outlet hole and the central axis of the central shaft is 30° - 60°; the included angle between the opening direction of the second oil outlet hole and the central axis of the central shaft is 30° - 60°.

[0007] In some embodiments, a first oil collecting groove is provided in the cavity adjacent to the first end, and the first oil outlet hole communicates with the cavity through the first oil collecting groove; a second oil collecting groove is provided in the cavity adjacent to the second end, and the second oil outlet hole communicates with the cavity through the second oil collecting groove.

[0008] In some embodiments, the first oil sump is coaxially distributed in the cavity with the central axis, and the cross-section of the first oil sump is arc-shaped; the second oil sump is coaxially distributed in the cavity with the central axis, and the cross-section of the second oil sump is arc-shaped.

[0009] In some embodiments, the number of the first oil outlet holes is 1 to 5, and the first oil outlet holes are evenly distributed on the first oil sump; the number of the second oil outlet holes is 1 to 5, and the second oil outlet holes are evenly distributed on the second oil sump.

[0010] In some embodiments, the distribution of the first oil outlet holes on the first oil sump is staggered from the distribution of the second oil outlet holes on the first oil sump.

[0011] In some embodiments, the cavity includes a first chamber provided with the first oil sump, a second chamber provided with the second oil sump, and an intermediate chamber located between the first chamber and the second chamber. The cross-sectional area of the intermediate chamber near the second chamber end is larger than the cross-sectional area of the intermediate chamber near the first chamber end.

[0012] In some embodiments, the intermediate chamber is provided with a third oil outlet hole communicating with the intermediate chamber. The number of the third oil outlet holes is 1 to 5, and the third oil outlet holes are distributed around the central axis of the central axis on the intermediate chamber; the motor oil cooling system includes a third cooling oil passage respectively communicating with the third oil outlet holes, and the third cooling oil passage is distributed in a rotor sleeved on the central axis.

[0013] In some embodiments, the intermediate chamber is provided with a fourth oil outlet hole communicating with the intermediate chamber. The number of the fourth oil outlet holes is 1 to 5, and the fourth oil outlet holes are distributed around the central axis of the central axis on the intermediate chamber; the motor oil cooling system includes a fourth cooling oil passage respectively communicating with the fourth oil outlet holes, and the fourth cooling oil passage is distributed in the rotor sleeved on the central axis.

[0014] In some embodiments, the third oil outlet hole and the fourth oil outlet hole are respectively located at opposite ends of the intermediate chamber, and the distribution of the third oil outlet holes on the intermediate chamber is staggered from the distribution of the fourth oil outlet holes on the intermediate chamber.

[0015] The embodiments of the present application have at least the following beneficial effects:

[0016] In the above motor oil cooling system, the cooling oil can enter the cavity of the central shaft from the oil inlet hole. Under the action of the centrifugal force generated by the rotation of the central shaft, since the first oil outlet hole communicates with the cavity and its opening faces the direction of the first bearing, and the second oil outlet hole communicates with the cavity and its opening faces the direction of the second bearing, the cooling oil can be sprayed from the first oil outlet hole to the first bearing and from the second oil outlet hole to the second bearing, so as to actively directly cool the first bearing and the second bearing, and the cooling oil sprayed to the first bearing and the second bearing is not easy to accumulate, improving the heat exchange effect between the cooling oil and the first bearing and the second bearing, and further improving the cooling effect on the bearings. Further, in the above motor oil cooling system, the structure for cooling the bearings is simple, and it has little influence on the structural strength of the motor oil cooling system, which is beneficial to reducing the manufacturing cost of the motor oil cooling system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 shows a cross-sectional view of the motor oil cooling system in the embodiment of the present application;

[0019] Figure 2 shows Figure 1 the cavity volume model diagram of the motor oil cooling system in;

[0020] Figure 3 shows Figure 1 the projection position relationship diagram of the first oil outlet hole and the second oil outlet hole in the cross-section of the motor oil cooling system in;

[0021] Figure 4 shows Figure 1 the projection position relationship diagram of the first oil outlet hole and the third oil outlet hole in the cross-section of the motor oil cooling system in;

[0022] Figure 5 shows Figure 1 the sectional view of the position relationship between the motor oil cooling system in and the rotor;

[0023] Figure 6 shows the cooling path diagram of the cooling oil of the motor oil cooling system in the embodiment of the present application to the first bearing and the second bearing;

[0024] Figure 7 shows the cooling path diagram of the cooling oil of the motor oil cooling system in the embodiment of the present application to the rotor.

[0025] Reference numerals:

[0026] 110, First bearing; 120, Second bearing; 200, Central shaft; 210, First end; 211, Oil inlet hole; 220, Second end; 230, Cavity; 231, First chamber; 232, Second chamber; 233, Intermediate chamber; 241, First oil outlet hole; 242, First oil sump; 251, Second oil outlet hole; 252, Second oil sump; 261, Third oil outlet hole; 262, Third cooling oil passage; 271, Fourth oil outlet hole; 272, Fourth cooling oil passage; 300, Rotor; 310, Balance ring; α, Angle between the inner wall of the intermediate chamber and the central axis of the central shaft. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0028] In addition, the present application may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0029] Next, the present application will be described in conjunction with the accompanying drawings and with reference to specific embodiments:

[0030] Figure 1 A cross-sectional view of the motor oil cooling system in the embodiment of the present application is shown. Figure 2 Shows Figure 1 The volume model diagram of the cavity 230 in the motor oil cooling system in Figure 1 And Figure 2As shown in the figure, an embodiment of the present application provides a motor oil cooling system. The motor oil cooling system includes a first bearing 110, a second bearing 120, and a central shaft 200. The second bearing 120 is disposed opposite to the first bearing 110. The central shaft 200 includes a first end 210 and a second end 220 opposite to the first end 210. The first end 210 is disposed in the first bearing 110, and the second end 220 is disposed in the second bearing 120. A cavity 230 is provided in the central shaft 200, and an oil inlet hole 211 communicating with the cavity 230 is provided at the first end 210. Among them, a first oil outlet hole 241 communicating with the cavity 230 is provided near the first end 210 of the central shaft 200, and the opening of the first oil outlet hole 241 faces the direction of the first bearing 110. A second oil outlet hole 251 communicating with the cavity 230 is provided near the second end 220 of the central shaft 200, and the opening of the second oil outlet hole 251 faces the direction of the second bearing 120.

[0031] Figure 6 The cooling oil path diagram of the first bearing 110 and the second bearing 120 by the cooling oil of the motor oil cooling system in the embodiment of the present application is shown. As Figure 6 shown, the cooling oil can enter the cavity 230 of the central shaft 200 from the oil inlet hole 211. Under the action of the centrifugal force generated by the rotation of the central shaft 200, since the first oil outlet hole 241 communicates with the cavity 230 and the opening faces the direction of the first bearing 110, and the second oil outlet hole 251 communicates with the cavity 230 and the opening faces the direction of the second bearing 120, the cooling oil can be sprayed from the first oil outlet hole 241 to the first bearing 110 and from the second oil outlet hole 251 to the second bearing 120, thereby realizing the active direct cooling of the first bearing 110 and the second bearing 120, and the cooling oil sprayed to the first bearing 110 and the second bearing 120 is not easy to accumulate, improving the heat exchange effect between the cooling oil and the first bearing 110 and the second bearing 120, and further improving the cooling effect on the bearing. Further, the above motor oil cooling system has a simple structure for cooling the bearing and has little influence on the structural strength of the motor oil cooling system, which is beneficial to reducing the manufacturing cost of the motor oil cooling system.

[0032] In some oil-cooled motors in the related art, an oil outlet hole is provided in the hollow central shaft 200. With the centrifugal force and gravity during the high-speed rotation of the motor, the cooling oil flows into each oil passage inside the rotor 300 to exchange heat with the rotor 300 and the permanent magnets, thereby reducing the temperature of the rotor 300 and the permanent magnets. The cooling oil after heat exchange flows out from both ends of the rotor 300, which can only cool the inside of the rotor 300 and cannot cool the bearings that also need cooling. In some other related arts, although active cooling of the bearings is considered, the channels for circulating the cooling oil are too closed, resulting in poor fluidity of the cooling oil and inability to quickly exchange heat with the bearings, and the cooling effect on the bearings is poor. In some cases, the flow rate of the cooling oil flowing into the bearings is small, that is, the flow rate allocated to the bearings is seriously insufficient and cannot achieve the cooling effect. To solve the cooling problem of the bearings, in the related art, additional oil passages are provided outside the rotor 300 to achieve active oil spraying cooling for the bearings. For example, an oil passage is provided on the motor end cover to spray oil on the bearings. Another example is that when the reducer is operating, the cooling oil is splashed onto the bearings by the agitation of the reducer for cooling the bearings. These bearing cooling methods not only have a small distribution amount of the cooling oil, but also have a slow, unstable, and uneven flow rate of the cooling oil, with a very limited cooling effect on the bearings, and at the same time, there are defects in the complex structure.

[0033] In view of the technical problems existing in the bearing cooling in the related art, the present application proposes an oil-cooling system for a motor, as Figure 1 and Figure 2 shown. In this oil-cooling system for a motor, a first oil outlet hole 241 corresponding to the first bearing 110 is provided, the first oil outlet hole 241 is communicated with the cavity 230 and the opening faces the direction of the first bearing 110. At the same time, a second oil outlet hole 251 corresponding to the second bearing 120 is provided, the second oil outlet hole 251 is communicated with the cavity 230 and the opening faces the direction of the second bearing 120. When the central shaft 200 rotates, the cooling oil in the cavity 230 can be sprayed from the first oil outlet hole 241 onto the first bearing 110 and from the second oil outlet hole 251 onto the second bearing 120 under the action of centrifugal force and gravity, so that the cooling oil can be accurately sprayed onto the first bearing 110 and the second bearing 120.

[0034] Furthermore, as Figure 1 and Figure 2As shown, in this motor oil cooling system, the flow rate of the cooling oil can increase as the rotational speed of the central shaft 200 increases, that is, a dynamic cooling effect can be achieved according to the operating states of the first bearing 110 and the second bearing 120. That is to say, when the rotational speed of the central shaft 200 is relatively low, the cooling requirements of the first bearing 110 and the second bearing 120 are relatively low. At the same time, at a relatively low rotational speed of the central shaft 200, the injection flow rate of the cooling oil is relatively low, and the cooling efficiency of the first bearing 110 and the second bearing 120 is also relatively low, meeting the cooling requirements of the first bearing 110 and the second bearing 120 at this time; when the rotational speed of the central shaft 200 is relatively high, the cooling requirements of the first bearing 110 and the second bearing 120 are relatively high. At the same time, at a relatively high rotational speed of the central shaft 200, the injection flow rate of the cooling oil is relatively high, and the cooling efficiency of the first bearing 110 and the second bearing 120 is also increased, meeting the cooling requirements of the first bearing 110 and the second bearing 120 at this time.

[0035] As an alternative embodiment, as Figure 1 and Figure 2 shown, the included angle between the opening direction of the first oil outlet hole 241 and the central axis of the central shaft 200 is 30° - 60°; the included angle between the opening direction of the second oil outlet hole 251 and the central axis of the central shaft 200 is 30° - 60°.

[0036] In some embodiments, as Figure 1 and Figure 2 shown, by making the included angle between the opening direction of the first oil outlet hole 241 and the central axis of the central shaft 200 be 30° - 60°, and making the included angle between the opening direction of the second oil outlet hole 251 and the central axis of the central shaft 200 be 30° - 60°, it can be ensured that the opening direction of the first oil outlet hole 241 corresponds to the first bearing 110, and it can be ensured that the opening direction of the second oil outlet hole 251 corresponds to the second bearing 120. During the rotation of the central shaft 200, the injection direction of the cooling oil is limited by the opening directions of the first oil outlet hole 241 and the second oil outlet hole 251, that is, the cooling oil can be more accurately injected onto the first bearing 110 and the second bearing 120, improving the cooling effect on the first bearing 110 and the second bearing 120.

[0037] In some embodiments, the angle between the opening direction of the first oil outlet hole 241 and the central axis of the central shaft 200 can be determined according to the distance between the first oil outlet hole 241 and the first bearing 110 and the cooling range of the first bearing 110. When the distance between the first oil outlet hole 241 and the first bearing 110 is relatively far and / or the cooling range of the first bearing 110 is relatively small, the angle between the opening direction of the first oil outlet hole 241 and the central axis of the central shaft 200 can be made relatively small; when the distance between the first oil outlet hole 241 and the first bearing 110 is relatively close and / or the cooling range of the first bearing 110 is relatively large, the angle between the opening direction of the first oil outlet hole 241 and the central axis of the central shaft 200 can be made relatively large. For example, the angle between the opening direction of the first oil outlet hole 241 and the central axis of the central shaft 200 can be 30°, 35°, 40°, 45°, 50°, 55°, 60°, etc. Similarly, the angle between the opening direction of the second oil outlet hole 251 and the central axis of the central shaft 200 can be determined according to the distance between the second oil outlet hole 251 and the second bearing 120 and the cooling range of the second bearing 120, which will not be elaborated here.

[0038] In some embodiments, such as Figure 2 and Figure 3 shown, by adjusting the angle between the opening direction of the first oil outlet hole 241 and the central axis of the central shaft 200, the opening of the first oil outlet hole 241 faces the ball of the first bearing 110, so that the cooling oil can enter the interior of the first bearing 110; similarly, by adjusting the angle between the opening direction of the second oil outlet hole 251 and the central axis of the central shaft 200, the opening of the second oil outlet hole 251 faces the ball of the second bearing 120, so that the cooling oil can enter the interior of the second bearing 120, achieving the purpose of cooling the interiors of the first bearing 110 and the second bearing 120 and improving the cooling effect on the first bearing 110 and the second bearing 120.

[0039] As an alternative embodiment, such as Figure 1 and Figure 2 shown, a first oil collecting groove 242 is provided near the first end 210 in the cavity 230, and the first oil outlet hole 241 communicates with the cavity 230 through the first oil collecting groove 242; a second oil collecting groove 252 is provided near the second end 220 in the cavity 230, and the second oil outlet hole 251 communicates with the cavity 230 through the second oil collecting groove 252.

[0040] In some embodiments, such as Figure 1 and Figure 2As shown, by respectively arranging a first oil collecting groove 242 and a second oil collecting groove 252 in the cavity 230, the cooling oil passing through the first oil collecting groove 242 in the cavity 230 can be retained in the first oil collecting groove 242, and the cooling oil passing through the second oil collecting groove 252 in the cavity 230 can be retained in the second oil collecting groove 252. When the central shaft 200 rotates, the cooling oil in the first oil collecting groove 242 is sprayed onto the first bearing 110 through the first oil outlet hole 241, and the cooling oil in the second oil collecting groove 252 is sprayed onto the second bearing 120 through the second oil outlet hole 251. That is to say, in these embodiments, the cooling oil in the cavity 230 can be collected through the first oil collecting groove 242 and the second oil collecting groove 252, the flow rate of the cooling oil sprayed onto the first bearing 110 and the second bearing 120 can be increased, and the cooling effect on the first bearing 110 and the second bearing 120 can be improved, so as to avoid the risk of temperature rise of the first bearing 110 and the second bearing 120 caused by insufficient or uneven distribution of the cooling oil for the first bearing 110 and the second bearing 120.

[0041] In some embodiments, the volume of the first oil collecting groove 242 can be adjusted by adjusting the depth and width of the first oil collecting groove 242 relative to the inner wall of the cavity 230, and the volume of the second oil collecting groove 252 can be adjusted by adjusting the depth and width of the second oil collecting groove 252 relative to the inner wall of the cavity 230, so as to further adjust the distribution amount of the cooling oil of the first oil outlet hole 241 opposite to the first oil collecting groove 242 and the distribution amount of the cooling oil of the second oil outlet hole 251 opposite to the second oil collecting groove 252, and finally achieve the purpose of adjusting the cooling effect on the first bearing 110 and the second bearing 120.

[0042] As an alternative embodiment, as Figure 1 and Figure 2 shown, the first oil collecting groove 242 is coaxially distributed in the cavity 230 with the central shaft 200, and the groove cross-section of the first oil collecting groove 242 is arc-shaped; the second oil collecting groove 252 is coaxially distributed in the cavity 230 with the central shaft 200, and the groove cross-section of the second oil collecting groove 252 is arc-shaped.

[0043] In some embodiments, as Figure 1 and Figure 2 shown, by coaxially distributing the first oil collecting groove 242 in the cavity 230 with the central shaft 200 and coaxially distributing the second oil collecting groove 252 in the cavity 230 with the central shaft 200, that is, the first oil collecting groove 242 and the second oil collecting groove 252 are respectively in the structure of an oil collecting ring, it can be more helpful for the first oil collecting groove 242 and the second oil collecting groove 252 to retain and collect the cooling oil in the cavity 230. Further, by making the groove cross-section of the first oil collecting groove 242 be arc-shaped and the groove cross-section of the second oil collecting groove 252 be arc-shaped, it is helpful for the stress release and transition of the structural strength of the central shaft 200, and avoids the risk of reduction of the structural strength of the central shaft 200 caused by stress concentration.

[0044] In some embodiments, the structures of the first oil collecting tank 242 and the second oil collecting tank 252 are the same. In some other embodiments, according to the different centrifugal rotation speed laws of the position cooling oil in the first oil collecting tank 242 and the second oil collecting tank 252, the structures and dimensions of the first oil collecting tank 242 and the second oil collecting tank 252 can be adjusted respectively to adjust the retention and collection efficiency of the cooling oil in the first oil collecting tank 242 and the second oil collecting tank 252, so that the cooling oil flow rate of the first oil outlet hole 241 meets the cooling requirement of the first bearing 110, and the cooling oil flow rate of the second oil outlet hole 251 meets the cooling requirement of the second bearing 120.

[0045] As an alternative embodiment, as Figure 1 and Figure 2 shown, the number of the first oil outlet holes 241 is from 1 to 5, and the first oil outlet holes 241 are evenly distributed on the first oil collecting tank 242; the number of the second oil outlet holes 251 is from 1 to 5, and the second oil outlet holes 251 are evenly distributed on the second oil collecting tank 252.

[0046] In some embodiments, as Figure 1 and Figure 2 shown, a plurality of first oil outlet holes 241 are evenly distributed on the first oil collecting tank 242, and at the same time, a plurality of second oil outlet holes 251 are evenly distributed on the second oil collecting tank 252. Through the uniform distribution modes of the plurality of first oil outlet holes 241 and the plurality of second oil outlet holes 251 respectively, not only can the cooling oil flow rates of the first oil outlet hole 241 and the second oil outlet hole 251 be increased, but also the outflow of the cooling oil can be made more uniform through the first oil outlet hole 241 and the second oil outlet hole 251, improving the stability of the cooling effects of the first bearing 110 and the second bearing 120.

[0047] In some embodiments, on the annular first oil collecting tank 242, 3 first oil outlet holes 241 can be provided and evenly arranged, and each first oil outlet hole 241 is spaced 120° from each other; similarly, on the annular second oil collecting tank 252, 3 second oil outlet holes 251 can be provided and evenly arranged, and each second oil outlet hole 251 is spaced 120° from each other.

[0048] Figure 3 Shows Figure 1 the projection position relationship diagram of the first oil outlet hole 241 and the second oil outlet hole 251 in the cross-section of the motor oil cooling system in

[0049] As an alternative embodiment, as Figure 3 shown, the distribution of the first oil outlet holes 241 on the first oil collecting tank 242 is staggered from the distribution of the second oil outlet holes 251 on the first oil collecting tank 242.

[0050] In some embodiments, as Figure 2and 3 As shown, staggering the distribution of the first oil outlet holes 241 on the first oil collecting groove 242 from the distribution of the second oil outlet holes 251 on the first oil collecting groove 242 can make the distribution of the cooling oil more reasonable and balanced, and better meet the cooling requirements of the first bearing 110 and the second bearing 120.

[0051] In some embodiments, such as Figure 2 and Figure 3 As shown, three evenly arranged first oil outlet holes 241 may be provided on the annular first oil collecting groove 242, and each first oil outlet hole 241 is spaced 120° from each other; similarly, three evenly arranged second oil outlet holes 251 may be provided on the annular second oil collecting groove 252, and each second oil outlet hole 251 is spaced 120° from each other. When the first oil outlet holes 241 and the second oil outlet holes 251 are respectively projected onto the cross-section of the motor oil cooling system, since the distribution of the first oil outlet holes 241 on the first oil collecting groove 242 is staggered from the distribution of the second oil outlet holes 251 on the first oil collecting groove 242, the projection of the first oil outlet hole 241 is spaced 120° from the projection of the adjacent first oil outlet hole 241, the projection of the second oil outlet hole 251 is spaced 120° from the projection of the adjacent second oil outlet hole 251, and the projection of the first oil outlet hole 241 is spaced 60° from the projection of the adjacent second oil outlet hole 251, forming a positional relationship as Figure 3 shown.

[0052] In some other embodiments, for example, four evenly arranged first oil outlet holes 241 may be provided on the annular first oil collecting groove 242, and each first oil outlet hole 241 is spaced 90° from each other; similarly, four evenly arranged second oil outlet holes 251 may be provided on the annular second oil collecting groove 252, and each second oil outlet hole 251 is spaced 90° from each other. When the first oil outlet holes 241 and the second oil outlet holes 251 are respectively projected onto the cross-section of the motor oil cooling system, since the distribution of the first oil outlet holes 241 on the first oil collecting groove 242 is staggered from the distribution of the second oil outlet holes 251 on the first oil collecting groove 242, the projection of the first oil outlet hole 241 is spaced 90° from the projection of the adjacent first oil outlet hole 241, the projection of the second oil outlet hole 251 is spaced 90° from the projection of the adjacent second oil outlet hole 251, and the projection of the first oil outlet hole 241 is spaced 45° from the projection of the adjacent second oil outlet hole 251.

[0053] In some other embodiments, the number of the first oil outlet holes 241 provided on the annular first oil sump 242 may also be different from the number of the second oil outlet holes 251 provided on the annular second oil sump 252. For example, the number of the first oil outlet holes 241 provided on the first oil sump 242 may be three, and the number of the second oil outlet holes 251 provided on the second oil sump 252 may be four. The staggered arrangement thereof may be adaptively adjusted based on the foregoing embodiments, which will not be elaborated herein.

[0054] As an alternative embodiment, as Figure 2 shown, the cavity 230 includes a first chamber 231 provided with a first oil sump 242, a second chamber 232 provided with a second oil sump 252, and an intermediate chamber 233 located between the first chamber 231 and the second chamber 232. The cross-sectional area of the intermediate chamber 233 adjacent to the second chamber 232 is larger than the cross-sectional area of the intermediate chamber 233 adjacent to the first chamber 231.

[0055] In some embodiments, as Figure 2 shown, the oil inlet hole 211 is provided at the first end 210 of the central axis 200. After the cooling oil enters the cavity 230 through the oil inlet hole 211, it sequentially passes through the first chamber 231, the intermediate chamber 233, and the second chamber 232. Since the distances between the first chamber 231, the intermediate chamber 233, and the second chamber 232 and the oil inlet hole 211 are different, the distribution of the cooling oil flow rates to the first chamber 231, the intermediate chamber 233, and the second chamber 232 is different, and the cooling oil flow rates at different positions within the same chamber are also different. The cooling oil flow rate in the first chamber 231 relatively close to the oil inlet hole 211 is relatively large, and the cooling oil flow rate in the second chamber 232 relatively far from the oil inlet hole 211 is relatively small.

[0056] In the embodiments of the present application, by making the cross-sectional area of the intermediate chamber 233 adjacent to the second chamber 232 larger than the cross-sectional area of the intermediate chamber 233 adjacent to the first chamber 231, that is, making the cross-sectional area of the intermediate chamber 233 gradually increase in the direction of the cooling oil flow, making the intermediate chamber 233 substantially in a conical structure, enabling the cooling oil to rapidly flow towards the second end 220 of the central axis 200 under the action of centrifugal force, thereby adjusting the distribution of the cooling oil in the cavity 230, so that the second chamber 232 relatively far from the oil inlet hole 211 can also have a balanced cooling oil flow rate as the first chamber 231 relatively close to the oil inlet hole 211, that is, making the second oil outlet hole 251 relatively far from the oil inlet hole 211 can also have a balanced cooling oil flow rate as the first oil outlet hole 241 relatively close to the oil inlet hole 211, thereby making the cooling oil flow rates of the first oil outlet hole 241 and the second oil outlet hole 251 more balanced.

[0057] As an alternative embodiment, asFigure 2 As shown, the included angle α between the inner wall of the intermediate chamber and the central axis of the central shaft is 1.0° to 2.0°.

[0058] In some embodiments, as Figure 2 shown, by making the included angle α between the inner wall of the intermediate chamber and the central axis of the central shaft be 1.0° to 2.0°, the intermediate chamber 233 can be in a conical structure. For example, the included angle α between the inner wall of the intermediate chamber and the central axis of the central shaft can be 1.0°, 1.5°, 2.0°, etc.

[0059] Figure 5 shows Figure 1 a sectional view of the positional relationship between the engine oil cooling system and the rotor 300 in Figure 1 and Figure 5 shown, the intermediate chamber 233 is provided with a third oil outlet hole 261 communicating with the intermediate chamber 233, the number of the third oil outlet holes 261 is 1 to 5, and the third oil outlet holes 261 are distributed on the intermediate chamber 233 around the central axis of the central shaft 200; the engine oil cooling system includes a third cooling oil passage 262 respectively communicating with the third oil outlet holes 261, and the third cooling oil passage 262 is distributed in the rotor 300 sleeved on the central shaft 200.

[0060] In some embodiments, as Figure 1 and Figure 5 shown, the intermediate chamber 233 can be communicated with the third cooling oil passage 262 through the third oil outlet hole 261, so that the cooling oil in the chamber 230 can enter the third cooling oil passage 262 through the third oil outlet hole 261 to cool the rotor 300.

[0061] In some embodiments, as Figure 1 and Figure 5 shown, a plurality of third cooling oil passages 262 are respectively distributed in the rotor 300 according to a certain rule, and a plurality of third oil outlet holes 261 are respectively communicated with the third cooling oil passages 262 one by one, so that the cooling oil can enter the third cooling oil passages 262 to cool and lower the temperature inside the rotor 300, and make the temperature distribution inside the rotor 300 uniform.

[0062] In some embodiments, as Figure 1 and Figure 5 shown, the intermediate chamber 233 is provided with 3 third oil outlet holes 261 communicating with the intermediate chamber 233, the 3 third oil outlet holes 261 are distributed on the intermediate chamber 233 around the central axis of the central shaft 200, and the adjacent third oil outlet holes 261 are spaced 120°.

[0063] Figure 4 shows Figure 1The projection position relationship diagram of the first oil outlet hole 241 and the third oil outlet hole 261 in the cross-section of the motor oil cooling system. In some embodiments, as Figure 4 shown, staggering the distribution of the first oil outlet hole 241 on the first oil collecting tank 242 from the distribution of the third oil outlet hole 261 on the intermediate chamber 233 can make the distribution of the cooling oil more reasonable and balanced, and better achieve a balanced cooling effect.

[0064] In some embodiments, as Figure 5 shown, the rotor 300 can be a multi-layer rotor core sleeved on the central shaft 200, and balance rings 310 can be respectively arranged at both ends of the rotor core. Optionally, a third oil drain port communicating with the third cooling oil passage 262 can be opened on the balance ring 310 to timely discharge the cooling oil in the third cooling oil passage 262, improve the fluidity of the cooling oil in the third cooling oil passage 262, and thus ensure that the cooling oil stably cools the rotor core through the third cooling oil passage 262.

[0065] As an alternative embodiment, as Figure 1 and Figure 5 shown, the intermediate chamber 233 is provided with a fourth oil outlet hole 271 communicating with the intermediate chamber 233. The number of the fourth oil outlet holes 271 is 1 to 5, and the fourth oil outlet holes 271 are distributed on the intermediate chamber 233 around the central axis of the central shaft 200; the motor oil cooling system includes a fourth cooling oil passage 272 respectively communicating with the fourth oil outlet holes 271, and the fourth cooling oil passage 272 is distributed in the rotor 300 sleeved on the central shaft 200.

[0066] In some embodiments, as Figure 1 and Figure 5 shown, the intermediate chamber 233 can be communicated with the fourth cooling oil passage 272 through the fourth oil outlet hole 271, so that the cooling oil in the cavity 230 can enter the fourth cooling oil passage 272 through the fourth oil outlet hole 271 to cool the rotor 300.

[0067] In some embodiments, as Figure 1 and Figure 5 shown, a plurality of fourth cooling oil passages 272 are respectively distributed in the rotor 300 according to a certain rule, and a plurality of fourth oil outlet holes 271 are respectively communicated with the fourth cooling oil passages 272 one by one, so that the cooling oil can enter the fourth cooling oil passage 272 to cool and lower the temperature inside the rotor 300, and make the temperature distribution inside the rotor 300 uniform.

[0068] In some embodiments, as Figure 1 and Figure 5As shown, the plurality of third cooling oil passages 262 and the plurality of fourth cooling oil passages 272 may be staggered and evenly distributed in the rotor 300 , so that the temperature distribution inside the rotor 300 may be more balanced.

[0069] In some embodiments, Figure 1 and Figure 5 As shown, the middle chamber 233 is provided with three fourth oil outlet holes 271 connected to the middle chamber 233 . The three fourth oil outlet holes 271 are distributed on the middle chamber 233 around the central axis of the central axis 200 , and adjacent fourth oil outlet holes 271 are spaced 120° apart.

[0070] In some embodiments, Figure 5 As shown, optionally, a fourth oil discharge port connected to the fourth cooling oil channel 272 can be opened on the balance ring 310 to discharge the cooling oil in the fourth cooling oil channel 272 in time, thereby improving the fluidity of the cooling oil in the fourth cooling oil channel 272, thereby ensuring that the cooling oil stably cools the core of the rotor 300 through the fourth cooling oil channel 272.

[0071] As an optional implementation, Figure 1 and Figure 5 As shown, the third oil outlet hole 261 and the fourth oil outlet hole 271 are respectively located at opposite ends of the middle chamber 233 , and the distribution of the third oil outlet hole 261 on the middle chamber 233 is staggered with the distribution of the fourth oil outlet hole 271 on the middle chamber 233 .

[0072] In some embodiments, Figure 1 and Figure 5 As shown, the third oil outlet hole 261 and the fourth oil outlet hole 271 are respectively located at opposite ends of the middle chamber 233, so that the cooling oil flow between the third oil outlet hole 261 and the fourth oil outlet hole 271 can be less affected, so that the third oil outlet hole 261 and the fourth oil outlet hole 271 can both have a relatively stable cooling oil flow.

[0073] Figure 7 FIG. 2 shows a cooling path diagram of the cooling oil of the motor oil cooling system to the rotor 300 in an embodiment of the present application. In some embodiments, as Figure 7 As shown, by locating the third oil outlet hole 261 and the fourth oil outlet hole 271 at the opposite ends of the intermediate chamber 233 respectively, the cooling oil in the third cooling oil flow channel and the fourth cooling oil flow channel can flow in different directions, thereby improving the cooling effect inside the rotor 300 and making the temperature distribution inside the rotor 300 more balanced.

[0074] In some embodiments, Figure 2 and Figure 5As shown, the distribution of the third oil outlet hole 261 on the intermediate chamber 233 is staggered from the distribution of the fourth oil outlet hole 271 on the intermediate chamber 233, which can make the distribution of the cooling oil more reasonable and balanced, and better achieve a balanced cooling effect. For example, the intermediate chamber 233 is provided with three third oil outlet holes 261 communicating with the intermediate chamber 233. The three third oil outlet holes 261 are distributed on the intermediate chamber 233 around the central axis of the central axis 200, and the adjacent third oil outlet holes 261 are spaced 120°. At the same time, the intermediate chamber 233 is provided with three fourth oil outlet holes 271 communicating with the intermediate chamber 233. The three fourth oil outlet holes 271 are distributed on the intermediate chamber 233 around the central axis of the central axis 200, and the adjacent fourth oil outlet holes 271 are spaced 120°. Viewed from the axial direction of the central axis 200, or from the projection positions of the third oil outlet hole 261 and the fourth oil outlet hole 271 on the cross-section of the motor oil cooling system, the third oil outlet hole 261 and the adjacent fourth oil outlet hole 271 are spaced 60°. That is, a total of six third oil outlet holes 261 and fourth oil outlet holes 271 are evenly arranged and staggered from each other, which can make the outflow of the cooling oil in the intermediate chamber 233 more balanced.

[0075] In some embodiments, as Figure 2 and Figure 5 shown, the distribution of the first oil outlet hole 241, the distribution of the third oil outlet hole 261, the distribution of the fourth oil outlet hole 271, and the distribution of the second oil outlet hole 251 can be staggered from each other in sequence, that is, the oil outlet holes are evenly misaligned in the cooling path of the central axis 200, making the outflow distribution of the cooling oil in the cavity 230 more scientific, reasonable and balanced, and having a better active cooling effect on the bearing.

[0076] In some embodiments, as Figure 6 and Figure 7 shown, since the first oil outlet hole 241 and / or the third oil outlet hole 261 are relatively close to the oil inlet hole 211, the cooling oil flows out faster; relatively, since the second oil outlet hole 251 and / or the fourth oil outlet hole 271 are relatively far from the oil inlet hole 211, the cooling oil flows out slower. In order to make the distribution of the cooling oil more balanced, as Figure 2 shown, the angle α between the inner wall of the intermediate chamber and the central axis of the central axis is 1.0° to 2.0°. That is to say, the cavity 230 of the central axis 200 can adopt a draft angle design of 1.0° to 2.0°, so that the inside of the cavity 230 is inclined to form a conical structure. Under the action of high-speed centrifugation and the conical structure, the outflow speed of the cooling oil in the second oil outlet hole 251 and / or the fourth oil outlet hole 271 in the cavity 230 is accelerated, so that the cooling oil distribution at both ends of the cavity 230 ( Figure 2 the left and right ends in

[0077] In the motor oil cooling system of the present application, an integrated multi-functional oil passage is formed within the central shaft 200. At the same time, by the way of evenly arranging the first oil outlet hole 241, the second oil outlet hole 251, the third oil outlet hole 261, and the fourth oil outlet hole 271 respectively, active cooling of the rotor 300, the first bearing 110, and the second bearing 120 can be achieved, avoiding the redundant design drawbacks of using redundant end covers and accessory combinations to form a supplementary oil passage design, making the overall structure of the motor oil cooling system simpler and the cooling effect more efficient and balanced.

[0078] In some embodiments, as Figure 6 and Figure 7 shown, the cooling oil enters the cavity 230 of the central shaft 200 from the oil inlet hole 211, passes through the first oil collecting groove 242. Part of the cooling oil stays in the first oil collecting groove 242 and is sprayed onto the first bearing 110 through the first oil outlet hole 241 to cool down the first bearing 110; passing through the third oil outlet hole 261 and the fourth oil outlet hole 271, part of the cooling oil enters the third cooling oil passage 262 and the fourth cooling oil passage 272 respectively to cool down the rotor 300; passing through the second oil collecting groove 252, the remaining cooling oil stays in the second oil collecting groove 252 and is sprayed onto the second bearing 120 through the second oil outlet hole 251 to cool down the second bearing 120.

[0079] In some embodiments, as Figure 6 and Figure 7 shown, under the action of the high-speed rotation centrifugal force of the central shaft 200 and the rotor 300, the cooling oil in the first oil collecting groove 242 will be quickly thrown out and sprayed out from 3 first oil outlet holes 241 respectively, and the cooling oil directly cools the first bearing 110; similarly, the cooling oil in the second oil collecting groove 252 will be quickly thrown out and sprayed out from 3 second oil outlet holes 251 respectively, and the cooling oil directly cools the second bearing 120.

[0080] In some embodiments, as Figure 6 and Figure 7 shown, under the action of the high-speed rotation centrifugal force of the central shaft 200 and the rotor 300, the cooling oil in the middle chamber 233 will be quickly thrown out from 3 third oil outlet holes 261 and 3 fourth oil outlet holes 271, flow into the third cooling oil passage 262 and the fourth cooling oil passage 272 inside the rotor 300, and finally be thrown out from both ends of the rotor 300 and enter the stator winding to cool the stator winding;

[0081] In some embodiments, as Figure 6 and Figure 7 shown, the conical structure design of the middle chamber 233 helps part of the cooling oil to flow out quickly from the fourth oil outlet hole 271 and another part to flow into the second oil collecting groove 252 and flow out when rotating at high speed, and then flow out through the second oil outlet hole 251.

[0082] In this application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly under and obliquely under the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0083] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to this application.

[0084] In addition, in this application, descriptions such as "first", "second", etc. are only for descriptive purposes, and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second" may explicitly or implicitly include one or more of the said features. In the description of this application, "a plurality of" means two or more, unless otherwise clearly and specifically defined.

[0085] Although the embodiments of this application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, and the scope of this application is defined by the claims and their equivalents.

Claims

1. An engine oil cooling system, characterized in that, The motor oil cooling system includes: A first bearing; A second bearing, which is disposed opposite to the first bearing; and, A central shaft, the central shaft includes a first end and a second end opposite to the first end, the first end is disposed in the first bearing, the second end is disposed in the second bearing, a cavity is provided in the central shaft, and an oil inlet hole communicating with the cavity is provided at the first end; Wherein, a first oil outlet hole communicating with the cavity is provided at the central shaft near the first end, the opening of the first oil outlet hole faces the direction of the first bearing and the opening of the first oil outlet hole faces the balls of the first bearing; A second oil outlet hole communicating with the cavity is provided at the central shaft near the second end, the opening of the second oil outlet hole faces the direction of the second bearing and the opening of the second oil outlet hole faces the balls of the second bearing; A first oil collecting groove is provided in the cavity near the first end, and a second oil collecting groove is provided in the cavity near the second end; The first oil outlet hole communicates with the cavity through the first oil collecting groove; the second oil outlet hole communicates with the cavity through the second oil collecting groove; The cavity includes a first chamber provided with the first oil collecting groove, a second chamber provided with the second oil collecting groove, and an intermediate chamber located between the first chamber and the second chamber, and the cross-sectional area of the intermediate chamber near the second chamber end is larger than the cross-sectional area of the intermediate chamber near the first chamber end; The included angle α between the inner wall of the intermediate chamber and the central axis of the central shaft is 1.0° to 2.0°.

2. The motor oil cooling system according to claim 1, characterized in that, The included angle between the opening direction of the first oil outlet hole and the central axis of the central shaft is 30° to 60°; the included angle between the opening direction of the second oil outlet hole and the central axis of the central shaft is 30° to 60°.

3. The motor oil cooling system according to claim 1 or 2, characterized in that The first oil collecting groove is coaxially distributed in the cavity with the central shaft, and the groove cross-section of the first oil collecting groove is arc-shaped; the second oil collecting groove is coaxially distributed in the cavity with the central shaft, and the groove cross-section of the second oil collecting groove is arc-shaped.

4. The motor oil cooling system according to claim 3, characterized in that, The number of the first oil outlet holes is 1 to 5, and the first oil outlet holes are evenly distributed on the first oil collecting groove; the number of the second oil outlet holes is 1 to 5, and the second oil outlet holes are evenly distributed on the second oil collecting groove.

5. The motor oil cooling system according to claim 4, wherein The distribution of the first oil outlet holes on the first oil collecting groove is staggered from the distribution of the second oil outlet holes on the first oil collecting groove.

6. The motor oil cooling system according to claim 1, characterized in that, The intermediate chamber is provided with a third oil outlet hole communicating with the intermediate chamber, the number of the third oil outlet holes is 1 to 5, and the third oil outlet holes are distributed around the central axis of the central shaft on the intermediate chamber; The motor oil cooling system includes a third cooling oil passage respectively communicating with the third oil outlet hole, and the third cooling oil passage is distributed in a rotor sleeved on the central shaft.

7. The motor oil cooling system according to claim 6, characterized in that, The intermediate chamber is provided with a fourth oil outlet hole communicating with the intermediate chamber, the number of the fourth oil outlet holes is 1 to 5, and the fourth oil outlet holes are distributed around the central axis of the central shaft on the intermediate chamber; The motor oil cooling system includes a fourth cooling oil passage that communicates with the fourth oil outlet hole respectively, and the fourth cooling oil passage is distributed in the rotor sleeved on the central shaft.

8. The motor oil cooling system according to claim 7, characterized in that, The third oil outlet hole and the fourth oil outlet hole are respectively located at opposite ends of the intermediate chamber, and the distribution of the third oil outlet hole on the intermediate chamber is staggered from the distribution of the fourth oil outlet hole on the intermediate chamber.

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