Motor cooling structure, motor and vehicle

Abstract

The utility model relates to a motor cooling structure, a motor and a vehicle. The motor cooling structure comprises a rotor core, one end of the rotor core is provided with a left dynamic balance plate, the other end of the rotor core is provided with a right dynamic balance plate, and a first cooling oil duct is formed in the rotor core; a second cooling oil channel communicated with the first cooling oil channel is formed in the left dynamic balance plate, a third cooling oil channel communicated with the first cooling oil channel is formed in the right dynamic balance plate, and a first oil spraying opening connected with the second cooling oil channel is formed in the left dynamic balance plate. And the right dynamic balance plate is provided with a second oil nozzle connected with the third cooling oil duct, so that the rotor and the stator of the motor can be cooled at the same time. The utility model also provides a motor which comprises the motor cooling structure. The utility model further provides a vehicle which comprises the motor. According to the utility model, the problems of high cost and low motor efficiency caused by easy mechanical wear due to dynamic sealing of the existing motor cooling structure are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil cooling motor technical field, concretely relates to a motor cooling structure, motor and vehicle. BACKGROUND

[0002] With the continuous progress of new energy automobile manufacturing technology, the improvement of unit heat consumption of automobile electric drive system puts forward more severe challenges to motor cooling system. In view of the technical requirement of rotor cooling of new energy automobile electric drive system, the current mainstream scheme is to provide the rotor with a cooling oil inlet channel through a hollow shaft, and to realize effective cooling of the rotor by means of various rotor cooling oil circuits. For example, the oil-cooled motor with built-in oil circuit structure disclosed in CN113241880A includes a casing structure, including a casing body, the casing body is provided with an oil inlet, a casing first oil channel and a casing second oil channel communicated with the oil inlet; an end cover structure, including a first end cover and a second end cover arranged at both ends of the casing body; a stator assembly, including a stator core arranged in the casing body and a stator winding connected with the stator core, the stator core is provided with a core axial oil channel, the core axial oil channel is communicated with the casing first oil channel and the casing second oil channel; a rotor assembly, including a motor spindle clamped in the stator assembly and protruding out of the first end cover, motor bearings arranged at both ends of the motor spindle, and a rotor core connected with the motor spindle; an oil pan arranged at the bottom of the casing body, the oil pan and the casing body form an oil collecting tank. Although the entire oil circuit is designed inside the motor parts, the structure is simple and easy to assemble. However, this oil cooling structure highly depends on the hollow motor shaft as the inlet of cooling oil, not only increases the manufacturing cost, but also requires dynamic sealing between the shaft and the shell to ensure the stability of oil pressure and flow rate at the rotor inlet. However, the introduction of dynamic sealing inevitably brings additional mechanical friction loss, which further reduces the efficiency of the motor.

[0003] Another way is to bypass the center of the motor shaft and guide the cooling oil into the motor rotor through the outer oil channel on the motor shaft. For example, the oil circuit structure of the oil-cooled motor rotor disclosed in CN116404781A includes a housing, a bushing, a rotor core, a first balance plate, a second balance plate, a stator assembly and a rotor shaft; the rotor core, the bushing, the first balance plate and the second balance plate are all sleeved on the rotor shaft, the stator assembly is sleeved on the outer side of the rotor core, the end of the bushing away from the rotor shaft abuts against the housing, the bushing is provided with an annular oil distribution groove and a radial oil hole, the rotor shaft is provided with a plurality of bent oil channels, the bent oil channels are communicated with the annular oil distribution groove and the radial groove, the rotor core is provided with a plurality of axial oil channels, the axial oil channels are communicated with the axial oil outlet holes, and the first balance plate is further provided with an inclined oil outlet hole communicated with the axial oil channels. Although this oil circuit structure avoids the use of hollow shaft, it still needs to carefully design the dynamic sealing structure between the motor shaft and the shell to ensure that the cooling oil can smoothly enter and maintain stable oil pressure and flow rate.

[0004] In summary, the rotor cooling technology of the electric drive system of the new energy vehicle faces many challenges, and needs to be comprehensively considered and optimized in terms of cost control, cooling effect, mechanical efficiency and the like. Practical new type content

[0005] Therefore, the motor cooling structure, the motor and the vehicle are provided to solve the problems of high cost and mechanical abrasion leading to low motor efficiency caused by the dynamic sealing of the existing motor cooling structure.

[0006] In order to achieve the above-mentioned purpose, the technical scheme adopted by the utility model is as follows:

[0007] A motor cooling structure, comprising a rotor core, one end of the rotor core is provided with a left dynamic balance plate, the other end is provided with a right dynamic balance plate, and a first cooling oil channel is formed in the inside of the rotor core;

[0008] A second cooling oil channel is formed on the left dynamic balance plate and is in communication with the first cooling oil channel, a third cooling oil channel is formed on the right dynamic balance plate and is in communication with the first cooling oil channel, a first oil injection port is arranged on the left dynamic balance plate and is connected with the second cooling oil channel, and a second oil injection port is arranged on the right dynamic balance plate and is connected with the third cooling oil channel, so as to simultaneously realize the cooling of the motor rotor and the stator.

[0009] According to the above technical means, by arranging the cooling oil channels on the rotor core, the left dynamic balance plate and the right dynamic balance plate respectively, the cooling oil flow is successfully realized to bypass the motor rotating shaft, and the motor rotor and the stator are efficiently cooled. Not only the cooling demand of the motor rotor and the stator is met, but also the high cost caused by the oil channel arranged on the motor rotating shaft and the mechanical abrasion problem caused by the dynamic sealing structure are avoided, and the operation efficiency of the motor is effectively improved.

[0010] Preferably, the second cooling oil channel comprises an oil collecting groove, a first injection oil channel, a first flow-through oil channel and a first annular oil channel formed on the left dynamic balance plate;

[0011] One end of the first injection oil channel is in communication with the oil collecting groove, and the other end is the first oil injection port;

[0012] One end of the first flow-through oil channel is in communication with the oil collecting groove, and the other end is in communication with the first annular oil channel;

[0013] The first annular oil channel is in communication with the first cooling oil channel.

[0014] Preferably, a guide vane for guiding the cooling oil to flow into the oil collecting groove is formed on the left end face of the left dynamic balance plate.

[0015] By forming the guide vanes on the left end face of the left dynamic balance plate, the cooling oil is quickly introduced into the oil collecting groove, the flow of the cooling oil is accelerated, and the cooling efficiency is improved.

[0016] Preferably, the first injection oil channel is arranged towards the motor stator winding.

[0017] Preferably, the first flow-through oil channel is arranged towards the rotor iron core.

[0018] Preferably, the first injection oil channel is arranged in multiple along the circumferential direction of the left dynamic balance plate.

[0019] Preferably, the first flow-through oil channel is arranged in multiple along the circumferential direction of the left dynamic balance plate.

[0020] By arranging multiple first injection oil channels and first flow-through oil channels along the circumferential direction of the left dynamic balance plate, the amount of cooling oil flowing into the rotor oil channel and the uniform injection to the motor stator winding are effectively balanced, and the rotor and stator cooling is more uniform.

[0021] Preferably, the third cooling oil channel includes a second annular oil channel and a second injection oil channel formed on the right dynamic balance plate.

[0022] The second annular oil channel communicates with the first cooling oil channel.

[0023] One end of the second injection oil channel communicates with the second annular oil channel, and the other end is the second oil injection port.

[0024] Preferably, the second injection oil channel is arranged towards the motor stator winding.

[0025] Preferably, the second injection oil channel is arranged in multiple along the circumferential direction of the right dynamic balance plate.

[0026] By arranging multiple second injection oil channels along the circumferential direction of the right dynamic balance plate, uniform cooling of the motor stator winding is effectively achieved.

[0027] Preferably, the motor cooling structure further includes an oil injection pipe for injecting cooling oil onto the left end face of the left dynamic balance plate.

[0028] Preferably, the housing of the motor cooling structure is provided with an oil injection port for injecting cooling oil onto the left end face of the left dynamic balance plate.

[0029] Preferably, the first cooling oil channel is arranged along the axial direction of the rotor iron core.

[0030] Preferably, the first cooling oil channel is arranged in multiple along the circumferential direction of the rotor iron core.

[0031] By arranging multiple first cooling oil channels at intervals in the circumferential direction of the rotor core, uniform cooling of the rotor core is effectively achieved, and the cooling efficiency is improved.

[0032] The working principle of the motor cooling structure is as follows: an oil injection pipe or an oil injection port is directly formed on the motor shell, cooling oil is sprayed onto the left dynamic balance plate, the cooling oil is accelerated and thrown into the oil collecting groove under the assistance of the guide vane, and forms a certain oil pressure under the action of centrifugal force. Part of the cooling oil in the oil collecting groove flows into the first injection oil channel and flows out of the rotor through the first oil injection port, thereby cooling the left motor stator winding. Another part of the cooling oil in the oil collecting groove flows into the first cooling oil channel of the rotor core through the first flow-through oil channel and the first annular oil channel, thereby cooling the rotor core, and then continues to flow into the second annular oil channel of the right dynamic balance plate, and then flows into the second injection oil channel from the second annular oil channel and is thrown out to the right motor stator winding from the second oil injection port, thereby simultaneously cooling the motor stator winding and the rotor core.

[0033] The utility model also provides a motor, including the motor cooling structure of the utility model.

[0034] Preferably, the motor further comprises a rotating shaft, and the rotating shaft is provided with the rotor core, the left dynamic balance plate and the right dynamic balance plate.

[0035] The utility model also provides a vehicle comprising the motor of the utility model.

[0036] The utility model has the advantages of:

[0037] The motor cooling structure of the utility model successfully realizes that the cooling oil directly bypasses the motor rotating shaft and efficiently cools the motor rotor and stator by arranging cooling oil channels on the rotor core, the left dynamic balance plate and the right dynamic balance plate. Not only does it meet the cooling needs of the motor rotor and stator, but it also ingeniously avoids the high cost of setting up oil channels on the motor rotating shaft and the mechanical wear and tear caused by the dynamic sealing structure, effectively improves the operation efficiency of the motor, and has the advantages of simple structure and easy implementation, and has promotional application value in the oil-cooled motor technology field. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 Fig. 1 is a structural schematic diagram of the motor cooling structure of the utility model;

[0039] Figure 2 Fig. 3 is a structural schematic diagram of the left dynamic balance plate;

[0040] Figure 3 Fig. 4 is a structural schematic diagram of the right dynamic balance plate;

[0041] Figure 4 For Figure 1 the local enlarged view at A in the middle;

[0042] Figure 5 For Figure 1 the local enlarged view at B in the middle;

[0043] 1-rotor core, 11-first cooling oil channel; 2-left side dynamic balance plate, 21-first oil injection port, 22-oil collecting groove, 23-first injection oil channel, 24-first flow-through oil channel, 25-first annular oil channel, 26-guide vane; 3-right side dynamic balance plate, 31-second oil injection port, 32-second annular oil channel, 33-second injection oil channel; 4-oil injection pipe; 5-rotating shaft. DETAILED DESCRIPTION

[0044] Other advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure of the present application. The present application can also be implemented or applied in other different specific embodiments, and various modifications or changes can be made to the details in the present application based on different viewpoints and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application, but not for limiting the protection scope of the present application.

[0045] It should be noted that the drawings provided in the following embodiments only schematically illustrate the basic concept of the present application, and only the components related to the present application are shown in the drawings, but not drawn according to the number, shape and size of the components in actual implementation. The shape, number and proportion of each component in actual implementation can be arbitrarily changed, and the layout pattern of the components can also be more complex. EMBODIMENT

[0046] As Figures 1 to 5 shown, a motor cooling structure includes a rotor core 1, one end of the rotor core 1 is provided with a left side dynamic balance plate 2, the other end is provided with a right side dynamic balance plate 3, and the inside of the rotor core 1 is formed with a first cooling oil channel 11.

[0047] A second cooling oil channel is formed on the left side dynamic balance plate 2 and communicates with the first cooling oil channel 11, a third cooling oil channel is formed on the right side dynamic balance plate 3 and communicates with the first cooling oil channel 11, a first oil injection port 21 is arranged on the left side dynamic balance plate 2 and connected with the second cooling oil channel, and a second oil injection port 31 is arranged on the right side dynamic balance plate 3 and connected with the third cooling oil channel, so as to simultaneously realize the cooling of the motor rotor and the stator.

[0048] By arranging cooling oil channels on the rotor core, the left dynamic balance plate and the right dynamic balance plate respectively, the cooling oil flow is successfully realized to bypass the motor shaft, and the motor rotor and stator are efficiently cooled. Not only does it meet the cooling needs of the motor rotor and stator, but it also cleverly avoids the high cost of setting up oil channels on the motor shaft and the mechanical wear problems caused by the dynamic sealing structure, effectively improving the operating efficiency of the motor.

[0049] In some embodiments, in order to simultaneously realize the cooling of the motor stator winding and the rotor core, the second cooling oil channel includes a oil collecting groove 22, a first jet oil channel 23, a first flow-through oil channel 24 and a first annular oil channel 25 formed on the left dynamic balance plate 2;

[0050] One end of the first jet oil channel 23 is communicated with the oil collecting groove 22, and the other end is the first oil injection port 21;

[0051] One end of the first flow-through oil channel 24 is communicated with the oil collecting groove 22, and the other end is communicated with the first annular oil channel 25;

[0052] The first annular oil channel 25 is communicated with the first cooling oil channel 11.

[0053] In some embodiments, in order to quickly introduce cooling oil into the oil collecting groove to speed up the flow of cooling oil and improve cooling efficiency, a guide vane 26 for guiding the cooling oil to flow into the oil collecting groove 22 is formed on the left end face of the left dynamic balance plate 2.

[0054] In some embodiments, in order to effectively realize the cooling of the left motor stator winding, the first jet oil channel 23 is arranged towards the motor stator winding.

[0055] In some embodiments, in order to smoothly introduce cooling oil into the rotor core, the first flow-through oil channel 24 is arranged towards the rotor core 1.

[0056] In some embodiments, in order to balance the amount of cooling oil flowing into the first cooling oil channel, a plurality of first jet oil channels 23 are arranged along the circumferential direction of the left dynamic balance plate 2.

[0057] In some embodiments, in order to realize uniform injection of the left motor stator winding, a plurality of first flow-through oil channels 24 are arranged along the circumferential direction of the left dynamic balance plate 2.

[0058] In some embodiments, in order to effectively realize the cooling of the right motor stator winding, the third cooling oil channel includes a second annular oil channel 32 and a second jet oil channel 33 formed on the right dynamic balance plate 3;

[0059] The second annular oil channel 32 is communicated with the first cooling oil channel 11;

[0060] One end of the second jet oil channel 33 is communicated with the second annular oil channel 32, and the other end is the second oil injection port 31.

[0061] In some embodiments, in order to realize uniform jetting to the right motor stator winding, the second jet oil channel 33 is arranged towards the motor stator winding.

[0062] In some embodiments, in order to realize uniform cooling to the right motor stator winding, a plurality of second jet oil channels 33 are arranged along the circumferential direction of the right dynamic balance plate 3.

[0063] In some embodiments, the motor cooling structure further comprises an oil injection pipe 4 for injecting cooling oil to the left end surface of the left dynamic balance plate 2; or, an oil injection port is arranged on the shell of the motor cooling structure for injecting cooling oil to the left end surface of the left dynamic balance plate 2.

[0064] In some embodiments, the first cooling oil channel 11 is arranged along the axial direction of the rotor core 1.

[0065] In some embodiments, in order to realize uniform cooling to the motor rotor core, a plurality of first cooling oil channels 11 are arranged along the circumferential direction of the rotor core 1.

[0066] In actual use, the above motor cooling structure sprays cooling oil to the left dynamic balance plate 2 through the oil pipe or directly on the motor shell to form an oil injection port, and then the cooling oil is quickly introduced into the oil collecting groove 22 through the guide vanes 26 formed on the left end surface of the left dynamic balance plate 2; under the action of centrifugal force, the cooling oil in the oil collecting groove 22 forms oil pressure, so that part of the cooling oil in the oil collecting groove 22 flows into the first cooling oil channel 11 of the rotor core 1 through the first flow-through oil channel 24 and the first annular oil channel 25, realizing cooling of the rotor core 1, and the other part of the cooling oil in the oil collecting groove 22 flows into the first jet oil channel 23 and is sprayed to the left motor stator winding from the first oil injection port 21; the cooling oil in the first cooling oil channel 11 cools the rotor core 1 and then continues to flow into the second annular oil channel 32 of the right dynamic balance plate 3, and then flows into the second jet oil channel 33 from the second annular oil channel 32, and is sprayed to the right motor stator winding from the second oil injection port 31, thereby realizing cooling of the motor stator winding and the rotor core at the same time.

[0067] In some embodiments, a motor is also provided, comprising the motor cooling structure in any of the above embodiments.

[0068] In some embodiments, the motor further comprises a rotating shaft 5, and the rotating shaft 5 is provided with the rotor core 1, the left dynamic balance plate 2 and the right dynamic balance plate 3.

[0069] In some embodiments, a vehicle is also provided, comprising the motor in any of the above embodiments.

[0070] In summary, the motor cooling structure of the utility model, through arranging cooling oil channel respectively on the rotor core, left side dynamic balance plate and right side dynamic balance plate, successfully realized that the cooling oil flow directly bypasses motor rotating shaft, and carries out the high efficiency cooling to motor rotor and stator. Not only meet the cooling demand of motor rotor and stator simultaneously, also ingeniously avoids the high cost caused by setting up oil channel on motor rotating shaft and the mechanical wear problem possibly caused by dynamic sealing structure, effectively improves the operation efficiency of motor, and has the advantages of simple structure, easy to realize, in the oil cooling motor technical field, has the popularization and application value.

[0071] The above examples are only preferred embodiments for fully illustrating the utility model, and the protection scope of the utility model is not limited to this. The equivalent substitution or transformation of the skilled in the art on the basis of the utility model is within the protection scope of the utility model.

Claims

1. An electric machine cooling structure comprising a rotor core (1), characterized by, One end of the rotor core (1) is provided with a left dynamic balance plate (2), and the other end is provided with a right dynamic balance plate (3), and the inside of the rotor core (1) is formed with a first cooling oil channel (11); The left dynamic balance plate (2) is formed with a second cooling oil channel communicated with the first cooling oil channel (11), and the right dynamic balance plate (3) is formed with a third cooling oil channel communicated with the first cooling oil channel (11), and the left dynamic balance plate (2) is provided with a first oil injection port (21) communicated with the second cooling oil channel, and the right dynamic balance plate (3) is provided with a second oil injection port (31) communicated with the third cooling oil channel, so as to realize the cooling of the motor rotor and the stator at the same time.

2. The motor cooling structure according to claim 1, characterized by The second cooling oil channel comprises an oil collecting groove (22), a first injection oil channel (23), a first flow-through oil channel (24) and a first annular oil channel (25) formed on the left dynamic balance plate (2); One end of the first injection oil channel (23) is communicated with the oil collecting groove (22), and the other end is the first oil injection port (21); One end of the first flow-through oil channel (24) is communicated with the oil collecting groove (22), and the other end is communicated with the first annular oil channel (25); The first annular oil channel (25) is communicated with the first cooling oil channel (11).

3. The motor cooling structure according to claim 2, characterized by The left end face of the left dynamic balance plate (2) is formed with a guide vane (26) for guiding the cooling oil to flow into the oil collecting groove (22).

4. The motor cooling structure according to claim 2, characterized by The first injection oil channel (23) is arranged towards the motor stator winding; And / or, the first flow-through oil channel (24) is arranged towards the rotor core (1); And / or, the first injection oil channel (23) is arranged with multiple first injection oil channels in the circumferential direction of the left dynamic balance plate (2); And / or, the first flow-through oil channel (24) is arranged with multiple first flow-through oil channels in the circumferential direction of the left dynamic balance plate (2).

5. The motor cooling structure according to claim 1, characterized by The third cooling oil channel comprises a second annular oil channel (32) and a second injection oil channel (33) formed on the right dynamic balance plate (3); The second annular oil channel (32) is communicated with the first cooling oil channel (11); One end of the second injection oil channel (33) is communicated with the second annular oil channel (32), and the other end is the second oil injection port (31).

6. The motor cooling structure according to claim 5, characterized by The second injection oil channel (33) is arranged towards the motor stator winding; And / or, the second injection oil channel (33) is arranged with multiple second injection oil channels in the circumferential direction of the right dynamic balance plate (3).

7. The motor cooling structure according to claim 1, characterized by The motor cooling structure further comprises an oil injection pipe (4) for injecting cooling oil to the left end face of the left dynamic balance plate (2); Or, the shell of the motor cooling structure is provided with an oil injection port for injecting cooling oil to the left end face of the left dynamic balance plate (2); And / or, the first cooling oil channel (11) is arranged in the axial direction of the rotor core (1); And / or, the first cooling oil channel (11) is arranged with multiple first cooling oil channels in the circumferential direction of the rotor core (1).

8. An electric machine characterized by The motor cooling structure comprises the motor cooling structure according to any one of claims 1 to 7.

9. The electric machine of claim 8, wherein, Also included is a rotating shaft (5) on which the rotor core (1), the left dynamic balance plate (2) and the right dynamic balance plate (3) are arranged.

10. A vehicle characterized by comprising: An electric machine comprising a motor as claimed in claim 8 or claim 9.

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