Rotor cooling oil circuit structure, motor assembly and vehicle

Abstract

The utility model provides a rotor cooling oil circuit structure, a motor assembly and a vehicle, which belong to the technical field of vehicle power systems and comprise a casing, an armature winding, a rotor shaft, a rotor core and two balance plates. An oil inlet channel is arranged in the casing, and iron core oil holes are uniformly distributed on the circumference of the rotor iron core; wherein the first oil distribution holes in one balance plate are communicated with the first oil spraying holes in the other balance plate in a one-to-one correspondence mode through iron core oil holes, the two balance plates are further provided with second oil spraying holes communicated with the oil inlet channel, and the first oil spraying holes and the second oil spraying holes spray oil towards the armature winding. According to the rotor cooling oil path structure provided by the utility model, an oil path does not need to be arranged in the rotor shaft, the structure difficulty and the processing cost of the rotor shaft can be reduced, and meanwhile, two cooling oil paths can be formed by utilizing the balance plate to respectively carry out oil injection cooling on the rotor iron core and the armature winding, so that the cooling effect can be improved.

Description

Technical Field

[0001] This utility model belongs to the field of vehicle power system technology, specifically relating to a rotor cooling oil circuit structure, a motor assembly, and a vehicle. Background Technology

[0002] New energy vehicles have significant advantages over traditional fuel vehicles in terms of environmental protection and energy conservation, hence their increasing market share. Considering installation space, current new energy vehicles have very high requirements for the power density and efficiency of their motors, which poses a significant challenge to motor heat dissipation. Oil-cooled motors offer relatively good cooling performance. The mainstream cooling solution for their armature and rotor involves creating oil channels within the housing to cool the armature, and simultaneously creating oil channels within the rotor shaft to cool the rotor. Cooling oil enters the internal oil channels of the shaft and is sprayed through injection holes on the outer circumference of the shaft into the oil groove of the balance plate on one side of the core. From there, it enters the axial oil channels inside the rotor core to cool the rotor core. Finally, the cooling oil flows out from the balance plate on the other side of the core to the armature windings.

[0003] Currently, oil-cooled motor rotor cooling solutions are commonly used in non-coaxial electric drive systems. However, for coaxial electric drive systems, since the vehicle's half-shaft needs to coaxially pass through the motor's rotor shaft, the motor shaft must adopt a hollow structure. This makes it difficult for cooling oil to enter the rotor core assembly from the rotor shaft, thus affecting the motor rotor's heat dissipation capacity, which urgently needs to be solved. Utility Model Content

[0004] This utility model provides a rotor cooling oil circuit structure, a motor assembly, and a vehicle, aiming to improve the rotor heat dissipation performance of a coaxially arranged electric drive system.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: Firstly, a rotor cooling oil circuit structure is provided, including a housing, an armature winding, a rotor shaft, a rotor core mounted on the rotor shaft, and two balance plates respectively located at both ends of the rotor core; an oil inlet channel is provided inside the housing, and a plurality of core oil holes are evenly distributed around the circumference of the rotor core, penetrating along its axial direction; a plurality of first oil distribution holes and a plurality of first oil injection holes are provided on the balance plates, the first oil distribution holes on both balance plates are connected to the oil inlet channel, and each of the first oil distribution holes on one balance plate is connected to each of the first oil injection holes on the other balance plate through the core oil holes, and each of the first oil injection holes on both balance plates sprays oil toward the armature winding.

[0006] In conjunction with the first aspect, in one possible implementation, the balance plate has a plurality of first oil grooves on the side wall facing the rotor core, one end of each first oil groove is connected to one of the core oil holes, and the other end is connected to one of the first oil injection holes.

[0007] In some embodiments, the side wall of the balance plate away from the rotor core is provided with an oil collecting ring groove, which is connected to the oil inlet channel, and each first oil distribution hole is distributed circumferentially within the oil collecting ring groove.

[0008] For example, the housing is provided with an oil injection ring at each end of the rotor core. Both oil injection rings are connected to the oil inlet channel and are used to spray oil into the oil collection ring groove on one of the balance plates.

[0009] In some embodiments, a raised ring is provided on the plate surface of the balance plate away from the rotor core, and an oil collecting ring groove is formed between the raised ring and the peripheral wall of the rotor shaft.

[0010] For example, the inner ring surface of the convex ring forms an oil guiding slope; the oil injection ring is provided with a number of oil injection inclined holes along its circumferential direction, and each oil injection inclined hole sprays oil toward the oil guiding slope and the bottom of the oil collecting ring groove.

[0011] In some embodiments, the sidewall of the balance plate facing the rotor core is provided with a plurality of second oil grooves and a plurality of second oil injection holes. One end of each second oil groove is connected to the oil inlet channel, and the other end is connected to each of the corresponding second oil injection holes. Each of the second oil injection holes sprays oil toward the armature winding.

[0012] For example, the housing includes a main housing that is open at one end, and an end cap connected to the open end of the main housing; wherein, the main housing and the end cap are each provided with an oil inlet channel, and the two oil inlet channels are respectively connected to the first oil distribution hole on the two balance plates.

[0013] The beneficial effects of the rotor cooling oil circuit structure provided by this utility model are as follows: Compared with the prior art, in the rotor cooling oil circuit structure of this utility model, part of the cooling oil in the oil inlet channel flows through the first oil distribution holes on one of the balance plates, passes through several corresponding iron core oil holes, and is sprayed onto the armature winding by the first oil spray holes on the opposite balance plate. At the same time, another part of the cooling oil flows through the first oil distribution holes on another balance plate, passes through the remaining corresponding iron core oil holes, and is sprayed onto the armature winding by the first oil spray holes on the opposite balance plate. The cooling oil flows through the iron core oil holes in both directions. The cooling oil in the core oil hole not only improves the cooling effect on the rotor core, but also sprays into the armature winding through the first oil injection hole, thus producing a certain cooling effect on the armature winding. This allows for the formation of a cooling oil passage for cooling the rotor core and armature winding without occupying the internal space of the rotor shaft. This not only meets the requirements of the drive shaft that runs coaxially through the rotor shaft, making it suitable for coaxial electric drive systems, but also improves the rotor cooling effect. In addition, since there is no need to set up an oil passage inside the rotor shaft, the structure of the rotor shaft can be simplified, thereby reducing the difficulty and cost of rotor shaft processing.

[0014] Balance plates are installed at both ends of the rotor core. On the one hand, they balance the mass distribution of the rotor core, preventing vibration and noise caused by uneven mass distribution during high-speed rotation of the rotor core with the rotor shaft, thus improving the smoothness and quietness of motor operation. On the other hand, they also provide axial restraint for the rotor core, preventing displacement and misalignment during motor operation that could affect stability. Furthermore, the first oil distribution hole on one balance plate is connected to the first oil injection hole on the other balance plate through corresponding oil holes in the core. This allows the cooling oil in the oil inlet channel to flow from the first oil distribution hole on the balance plate to the oil holes in the core. This design is not only simple and compact, but also creates two sets of counter-flowing cooling oil paths inside the rotor core, improving the cooling uniformity of the rotor core and ensuring its integrity, preventing the cooling oil paths from affecting the rotational stability of the rotor core.

[0015] The first oil injection hole is set by using a balance plate, and a first oil groove is opened on the balance plate to connect with the first oil injection hole. This creates an oil inlet channel on the balance plate, which enters the core oil hole opened axially in the rotor core and then discharges the cooling oil through the first oil injection hole toward the armature winding. This allows the core cooling oil to be evenly distributed on the rotor core, avoiding mass eccentricity of the rotor core and ensuring stable rotation. Using a balance plate to establish the core cooling oil channel can improve the cooling effect while ensuring structural compactness.

[0016] Since the rotor core and balance plate are mounted on the rotor shaft for rotation, while the oil inlet channel inside the housing is stationary, an oil collecting ring groove is installed on the balance plate to collect the cooling oil discharged from the oil inlet channel. Then, the cooling oil in the oil collecting ring groove is diverted into the oil holes of the core through the first oil distribution holes. Finally, the cooling oil is sprayed onto the armature winding through the first oil spray hole. This ensures smooth flow of cooling oil without going through the rotor shaft, thereby improving structural compactness and meeting the requirements of coaxial electric drive systems.

[0017] After the cooling oil in the oil inlet channel enters the oil injection ring, it can be evenly sprayed to various positions in the oil collecting ring groove. This allows the cooling oil to be distributed in the oil collecting ring groove to each of the first oil distribution holes and then enter each of the iron core oil holes. This makes the oil injection volume of each first oil injection hole uniform, thereby improving the cooling uniformity of the rotor iron core and armature winding, avoiding the high temperature problem caused by insufficient local cooling oil flow, and helping to improve the stability of motor operation.

[0018] The balance plate has a raised ring on its surface. The inner ring of the raised ring can form an oil collecting groove with the peripheral wall of the rotor shaft, thereby receiving the cooling oil sprayed by the oil injection ring. The structure is simple and compact. Compared with the existing technology, there is no need to set up an oil passage inside the rotor shaft, which simplifies the structure of the rotor shaft and reduces the processing difficulty and cost of the rotor shaft.

[0019] The inner ring surface of the convex ring is inclined at an angle, which on the one hand increases the size of the oil collecting ring groove, and on the other hand facilitates the guidance of the cooling oil sprayed onto the inner ring surface to the bottom of the oil collecting ring groove and the first oil distribution hole, thereby preventing the cooling oil from flowing out of the oil collecting ring groove and being wasted. The oil spraying ring, by setting the oil spraying angled hole, can evenly spray the cooling oil to the bottom of the oil collecting ring groove and the oil guiding slope, which helps to improve the uniformity of the distribution of the cooling oil to each first oil distribution hole, thereby improving the cooling uniformity of the cooling oil through each iron core cooling oil circuit to the rotor iron core and through each winding cooling oil circuit to the armature winding.

[0020] The housing adopts a split structure with a main housing and end covers. During assembly, the armature winding can be wound into the stator slots inside the housing first. Then, the rotor core and balance plate are fitted onto the rotor shaft and installed as a whole into the main housing. Finally, the end covers are installed, which improves the convenience of assembly and maintenance. On this basis, an oil inlet channel is set in the end covers and the main housing, respectively, corresponding to the oil passages on both sides of the rotor core. The oil inlet at both ends can form reverse flow of cooling oil in the different oil holes inside the rotor core, thereby improving the cooling uniformity of the rotor core.

[0021] By utilizing the second oil groove and the second oil spray hole set on the balance plate, an oil circuit directly used for cooling the armature winding can be established on each of the two balance plates. The cooling oil in the oil inlet channel can pass through the second oil groove on the two balance plates and spray oil onto the armature winding for cooling, thereby improving the cooling effect of the armature winding.

[0022] Secondly, this utility model embodiment also provides a motor assembly, including the above-mentioned rotor cooling oil circuit structure.

[0023] The beneficial effects of the motor assembly provided by this utility model are as follows: Compared with the prior art, the motor assembly of this utility model adopts the above-mentioned rotor cooling oil circuit structure. Part of the cooling oil in the oil inlet channel flows through the first oil distribution holes on one of the balance plates, passes through several corresponding iron core oil holes, and is sprayed onto the armature winding by the first oil spray holes on the opposite balance plate. Simultaneously, another part of the cooling oil flows through the first oil distribution holes on another balance plate, passes through the remaining corresponding iron core oil holes, and is sprayed onto the armature winding by the first oil spray holes on the opposite balance plate. This bidirectional flow through the iron cores... The cooling oil in the oil hole not only improves the cooling effect on the rotor core, but can also be sprayed onto the armature winding through the first oil injection hole, thereby producing a certain cooling effect on the armature winding. Thus, two cooling oil passages for cooling the rotor core and armature winding can be formed without occupying the internal space of the rotor shaft. This not only meets the needs of the drive shaft that runs coaxially inside the rotor shaft, making it suitable for coaxial electric drive systems, but also improves the rotor cooling effect. In addition, since there is no need to set up oil passages inside the rotor shaft, the structure of the rotor shaft can be simplified, thereby reducing the difficulty and cost of rotor shaft processing.

[0024] Thirdly, this utility model embodiment also provides a vehicle including the above-described motor assembly.

[0025] The beneficial effects of the vehicle provided by this utility model are as follows: Compared with the prior art, the vehicle of this utility model adopts a motor assembly with the above-mentioned rotor cooling oil circuit structure. Part of the cooling oil in the oil inlet channel flows through the first oil distribution holes on one of the balance plates, passes through several corresponding iron core oil holes, and is sprayed onto the armature winding by the first oil injection holes on the opposite balance plate. Simultaneously, another part of the cooling oil flows through the first oil distribution holes on another balance plate, passes through the remaining corresponding iron core oil holes, and is sprayed onto the armature winding by the first oil injection holes on the opposite balance plate. This bidirectional flow through the various... The cooling oil in the core oil hole not only improves the cooling effect on the rotor core, but can also be sprayed onto the armature winding through the first oil injection hole, thereby producing a certain cooling effect on the armature winding. Thus, two cooling oil paths for cooling the rotor core and armature winding can be formed without occupying the internal space of the rotor shaft. This not only meets the needs of the drive shaft that runs coaxially inside the rotor shaft, making it suitable for coaxial electric drive systems, but also improves the rotor cooling effect. In addition, since there is no need to set up oil paths inside the rotor shaft, the structure of the rotor shaft can be simplified, thereby reducing the difficulty and cost of rotor shaft processing. Attached Figure Description

[0026] Figure 1 A cross-sectional view of the rotor cooling oil circuit structure provided in this embodiment of the utility model. Figure 1 ;

[0027] Figure 2 A cross-sectional view of the rotor cooling oil circuit structure provided in this embodiment of the utility model. Figure 2 ;

[0028] Figure 3 for Figure 1 A magnified schematic diagram of the partial structure at point A in the middle;

[0029] Figure 4 for Figure 1 A magnified schematic diagram of the local structure at point B;

[0030] Figure 5 for Figure 2 A magnified schematic diagram of the structure at point C in the middle;

[0031] Figure 6 This is a schematic diagram of the front structure of the balance plate used in an embodiment of this utility model;

[0032] Figure 7 This is a schematic diagram of the back structure of the balance plate used in an embodiment of this utility model;

[0033] Figure 8 For along Figure 6 Schematic diagram of the cross-sectional structure of the middle DD line;

[0034] Figure 9 This is a schematic diagram of the axial half-section structure of the balance plate used in the embodiment of this utility model.

[0035] In the diagram: 10, housing; 11, main housing; 12, end cover; 20, rotor shaft; 30, rotor core; 301, core oil hole; 40, armature winding; 50, balance plate; 500, oil collecting ring groove; 51, first oil injection hole; 52, second oil injection hole; 53, first oil groove; 54, second oil groove; 55, first oil distribution hole; 56, convex ring; 561, oil guide slope; 57, second oil distribution hole; 60, oil injection ring; 600, oil injection angle hole. Detailed Implementation

[0036] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0037] It should be noted that when an element is referred to as being "set on" or "connected to" another element, it can be directly on or indirectly on the other element. It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" or "several" means two or more, unless otherwise explicitly specified.

[0038] Please refer to the following: Figures 1 to 9 The rotor cooling oil circuit structure provided by this utility model will now be described. The rotor cooling oil circuit structure includes a housing 10, an armature winding 40, a rotor shaft 20, a rotor core 30 fitted onto the rotor shaft 20, and two balance plates 50 respectively located at both ends of the rotor core 30. The housing 10 has an oil inlet channel inside, and the rotor core 30 has a plurality of core oil holes 301 evenly distributed around its circumference and extending along its axial direction. The balance plates 50 have a plurality of first oil distribution holes 55 and a plurality of first oil spray holes 51. The first oil distribution holes 55 on both balance plates 50 are connected to the oil inlet channel, and each of the first oil distribution holes 55 on one balance plate 50 is connected to each of the first oil spray holes 51 on the other balance plate 50 through the core oil holes 301. Each of the first oil spray holes 51 on both balance plates 50 sprays oil toward the armature winding 40.

[0039] It should be noted that, in this embodiment, the oil inlet channel inside the housing 10 is a channel structure integrally formed during the machining process of the housing 10. The machining process of the housing 10 is existing technology and will not be described in detail here. The oil holes 301 inside the rotor core 30 are several through holes that are evenly distributed in the circumference and penetrate the rotor core 30 axially. The rotor core 30 itself is composed of several axially arranged single iron cores. The stator is embedded inside the housing 10. The stator has stator slots for winding coils to form the armature winding 40. These structures are the same as or similar to the prior art and will not be described in detail here. In this embodiment, the addition of balance plates 50 on both sides of the rotor core 30 can not only ensure the integrity and mass uniformity of the rotor core 30, but also provide dynamic balancing for the rotation of the rotor core 30, thereby improving the rotational stability of the rotor core 30. On this basis, the first oil distribution hole 55 and the first oil injection hole 51 opened on the two balance plates 50 corresponding to each oil hole 301 form a cooling oil passage for cooling the rotor core 30, thereby avoiding the structural drawback of setting up an oil supply to the rotor core 30 inside the rotor shaft 20.

[0040] It should be understood that in this embodiment, balance plates 50 are respectively provided at both ends of the rotor core 30. On the one hand, they can balance the mass distribution of the rotor core 30 and avoid vibration and noise caused by uneven mass distribution during the high-speed rotation of the rotor core 30 with the rotor shaft 20, which is beneficial to improving the smoothness and quietness of motor operation. On the other hand, they can also form an axial limit on the rotor core 30 to prevent the rotor core 30 from shifting or misaligning during motor operation and affecting stability.

[0041] Compared with the prior art, the rotor cooling oil circuit structure provided in this embodiment has the following characteristics: In the oil inlet channel, a portion of the cooling oil flows through the first oil distribution holes 55 on one of the balance plates 50, passes through several corresponding iron core oil holes 301, and is sprayed onto the armature winding 40 by the first oil spray holes 51 on the opposite balance plate 50. Simultaneously, another portion of the cooling oil flows through the first oil distribution holes 55 on another balance plate 50, passes through the remaining corresponding iron core oil holes 301, and is sprayed onto the armature winding 40 by the first oil spray holes 51 on the opposite balance plate 50. The cooling oil flows through the iron core oil holes 301 in both directions. This not only improves the cooling effect on the rotor core 30, but also allows for a certain cooling effect on the armature winding 40 by spraying oil into the armature winding 40 through the first oil injection hole 51. Thus, a cooling oil passage for cooling the rotor core 30 and the armature winding 40 can be formed without occupying the internal space of the rotor shaft 20. This not only meets the requirements of the drive shaft that runs coaxially inside the rotor shaft 20, making it suitable for coaxial electric drive systems, but also improves the rotor cooling effect. In addition, since no oil passage needs to be set inside the rotor shaft 20, the structure of the rotor shaft 20 can be simplified, thereby reducing the processing difficulty and cost of the rotor shaft 20.

[0042] In some embodiments, see Figures 3 to 9 The balance plate 50 has several first oil grooves 53 on its side wall facing the rotor core 30. One end of each first oil groove 53 is connected to one of the core oil holes 301, and the other end is connected to one of the first oil injection holes 51. The first oil distribution hole 55 on one balance plate 50 is connected to the first oil injection hole 51 on another balance plate 50 through the corresponding core oil holes 301, so that the cooling oil in the oil inlet channel flows to the core oil hole 301 through the first oil distribution hole 55 on the balance plate 50. This not only makes the structure simple and compact, but also forms two sets of counter-flowing cooling oil paths inside the rotor core 30, improving the cooling uniformity of the rotor core 30.

[0043] For a specific structural configuration of the aforementioned balance plate 50, please refer to [link / reference]. Figures 3 to 9 The balance plate 50 has an oil collecting ring groove 500 on its side wall away from the rotor core 30. The oil collecting ring groove 500 is connected to the oil inlet channel. Each first oil distribution hole 55 is distributed circumferentially within the oil collecting ring groove 500.

[0044] Since the rotor core 30 and the balance plate 50 are both mounted on the rotor shaft 20 and rotate, while the oil inlet channel inside the housing 10 is stationary, the cooling oil discharged from the oil inlet channel is collected by setting an oil collecting ring groove 500 on the balance plate 50. Then, the cooling oil in the oil collecting ring groove 500 is diverted into the core oil hole 301 through each first oil distribution hole 55. Finally, the cooling oil is sprayed onto the armature winding 40 through the first oil spray hole 51. The smooth flow of cooling oil can be ensured without going through the rotor shaft 20, thereby improving the structural compactness and meeting the requirements of the coaxial electric drive system.

[0045] By setting an oil collecting ring groove 500 on the balance plate 50 and connecting it with the oil inlet channel on the housing 10, the cooling oil in the oil inlet channel can flow evenly to each iron core oil hole 301 through the oil collecting ring groove 500 on the balance plate 50. This not only makes the structure simple and compact, but also improves the uniformity of the distribution of cooling oil to each iron core oil hole 301, which is beneficial to improving the cooling uniformity of the rotor iron core 30.

[0046] The balance plate 50 is equipped with a first oil injection hole 51, and a first oil groove 53 connected to the first oil injection hole 51 is opened on the balance plate 50. Thus, a cooling oil path is established on the balance plate 50, whereby the cooling oil enters the core oil hole 301 axially opened on the rotor core 30 through the oil inlet channel, and then exits through the first oil injection hole 51 toward the armature winding 40 (this oil path is mainly used to cool the rotor core 30, and also has a certain cooling effect on the core winding). This means that only the core oil holes 301 need to be evenly arranged on the rotor core 30, which can avoid the mass eccentricity of the rotor core 30, ensure rotational stability, and improve the cooling effect while ensuring structural compactness.

[0047] For some possible implementations, please refer to [link / reference]. Figures 3 to 5 The housing 10 is provided with an oil injection ring 60 at both ends of the rotor core 30. Both oil injection rings 60 are connected to the oil inlet channel and are used to inject oil into the corresponding oil collection ring groove 500 on one of the balance plates 50.

[0048] After the cooling oil in the oil inlet channel enters the oil injection ring 60, it can be evenly sprayed to various positions in the oil collecting ring groove 500. This allows the cooling oil to be distributed in the oil collecting ring groove 500 to each of the first oil distribution holes 55 and then enter the iron core oil holes 301. This makes the amount of oil sprayed from each of the first oil injection holes 51 uniform, thereby improving the cooling uniformity of the rotor iron core 30 and armature winding 40, avoiding the high temperature problem caused by insufficient local cooling oil flow, and helping to improve the stability of motor operation.

[0049] Specifically, in combination Figure 3 and Figure 9 In this embodiment, a raised ring 56 is provided on the plate surface of the balance plate 50 facing away from the rotor core 30, and an oil collecting ring groove 500 is formed between the raised ring 56 and the peripheral wall of the rotor shaft 20. The raised ring 56 is provided on the plate surface of the balance plate 50, and the inner ring surface of the raised ring 56 can form an oil collecting ring groove 500 with the peripheral wall of the rotor shaft 20, thereby receiving the cooling oil sprayed by the oil spraying ring 60. The structure is simple and compact. Compared with the prior art, there is no need to set up an oil passage inside the rotor shaft 20, which simplifies the structure of the rotor shaft 20 and reduces the processing difficulty and cost of the rotor shaft 20.

[0050] It should be noted that the inner ring surface of the aforementioned convex ring 56 forms an oil guiding slope 561; the oil injection ring 60 is provided with a plurality of oil injection inclined holes 600 along its circumferential direction, and each oil injection inclined hole 600 sprays oil towards the oil guiding slope 561 and the bottom of the oil collecting ring groove 500. The inclined angle of the inner ring surface of the convex ring 56 can, on the one hand, increase the groove size of the oil collecting ring groove 500, and on the other hand, facilitate the guiding of the cooling oil sprayed onto the inner ring surface into the bottom of the oil collecting ring groove 500 and the first oil distribution hole 55, thereby avoiding the cooling oil from flowing out of the oil collecting ring groove 500 and being wasted; the oil injection ring 60, by providing oil injection inclined holes 600, can evenly spray the cooling oil onto the bottom of the oil collecting ring groove 500 and the oil guiding slope 561, which is beneficial to improving the uniformity of the distribution of the cooling oil to each of the first oil distribution holes 55, thereby improving the uniformity of cooling of the rotor core 30 and armature winding 40 by the cooling oil through each core oil hole 301.

[0051] For some possible implementation methods, please refer to [link / reference]. Figures 3 to 9 The balance plate 50 has several second oil grooves 54 and several second oil injection holes 52 on the side wall facing the rotor core 30. One end of each second oil groove 54 is connected to the oil inlet channel, and the other end is connected to each second oil injection hole 52 respectively. Each second oil injection hole 52 sprays oil towards the armature winding 40.

[0052] By utilizing the second oil groove 54 and the second oil spray hole 52 provided on the balance plate 50, an oil path can be established on each of the two balance plates 50 for directly cooling the armature winding 40. The cooling oil in the oil inlet channel can be sprayed onto the armature winding 40 through the second oil groove 54 on the two balance plates 50 and through the second oil spray hole 52 to cool the armature winding 40, thereby improving the cooling effect of the armature winding 40.

[0053] Specifically, such as Figure 8 As shown, the balance plate 50 is provided with second oil distribution holes 57 corresponding to the bottom of the oil collecting ring groove 500, which are connected to each of the second oil grooves 54. After the cooling oil in the oil inlet channel is sprayed into the oil collecting ring groove 500 by the oil spray ring 60, part of it enters the iron core oil hole 301 through each of the first oil distribution holes 55 and is finally sprayed onto the armature winding 40 through the first oil spray hole 51. The remaining cooling oil enters the second oil groove 54 through each of the second oil distribution holes 57 and is finally sprayed onto the armature winding 40 through each of the second oil spray holes 52. In this way, the balance plate 50 establishes two sets of cooling circuits for cooling the rotor iron core 30 and the armature winding 40 respectively, thereby improving the cooling effect.

[0054] In some embodiments, the housing 10 described above adopts, for example... Figure 1The structure shown includes a main housing 11 with one open end and an end cap 12 connected to the open end of the main housing 11; wherein, the main housing 11 and the end cap 12 are respectively provided with an oil inlet channel, and the two oil inlet channels are respectively connected to the first oil distribution hole 55 on the two balance plates 50.

[0055] It should be noted that, in the case where the balance plate 50 has a second oil groove 54 and a second oil injection hole 52, the two oil inlet channels are also connected to the second oil distribution holes 57 on the two balance plates 50 respectively, thereby enabling the cooling oil to be diverted to cool the rotor core 30 and the armature winding 40.

[0056] Furthermore, in combination Figure 8 and Figure 9 To improve the flow of cooling oil injected into the oil collecting ring groove 500 into the first oil distribution hole 55 and the second oil distribution hole 57, a groove is provided at the bottom of the oil collecting ring groove 500. The first oil distribution hole 55 and the second oil distribution hole 57 are circumferentially distributed at intervals on the bottom and wall of the groove. After the cooling oil is injected into the oil collecting ring groove 500, it first collects in the groove, and then flows along the groove into the first oil distribution hole 55 and the second oil distribution hole 57. This improves the flow and efficiency of cooling oil from the oil collecting ring groove 500 into the first oil distribution hole 55 and the second oil distribution hole 57.

[0057] The housing 10 adopts a split structure consisting of a main housing 11 and an end cover 12. During assembly, the armature winding 40 can be wound into the stator slot inside the main housing 11 first. Then, the rotor core 30 and balance plate 50 are fitted onto the rotor shaft 20 and installed as a whole into the main housing 11. Finally, the end cover 12 is installed, improving assembly and maintenance convenience. Furthermore, an oil inlet channel is provided inside the end cover 12 and the main housing 11, corresponding to the oil passages on both sides of the rotor core 30. This allows for the formation of winding cooling oil passages at both ends of the rotor core 30 to spray oil for cooling the armature winding 40. Simultaneously, the two-end oil inlet method enables bidirectional flow of cooling oil through the different core oil holes 301 inside the rotor core 30, thereby improving the cooling uniformity of the rotor core 30. Based on the above structure, the cooling oil flow path of the rotor cooling oil passage structure provided in this embodiment is as follows:

[0058] See Figure 1 , Figure 3 and Figure 4The cooling oil flow path for internal cooling of the rotor core 30 is as follows: Cooling oil from the oil inlet channel inside the end cover 12 enters the oil spray ring 60 near the end cover 12. The oil is sprayed into the oil collection ring groove 500 on the balance plate 50 near the end cover 12 via the evenly spaced circumferentially distributed oil spray holes 600 on the oil spray ring 60. Then, the oil flows through the first distribution holes 55 on the balance plate 50, aligned with the core oil holes 301 on the rotor core 30, into the corresponding core oil holes 301. After flowing through the core oil holes 301, the oil enters the first oil groove 53 on the balance plate 50 away from the end cover 12, and then is sprayed into the armature winding 4 via the first oil spray hole 51 through the first oil groove 53. 0; At the same time, the cooling oil in the oil inlet channel inside the housing 10 enters the oil spray ring 60 away from the end cover 12. The oil spray ring 60 uses the circumferentially spaced and evenly distributed oil spray angle holes 600 to spray the cooling oil into the oil collection ring groove 500 on the balance plate 50 away from the end cover 12. Then, it enters the remaining iron core oil holes 301 through the corresponding first oil distribution hole 55 on the balance plate 50 and enters the first oil groove 53 on the balance plate 50 near the end cover 12. Finally, it flows through the first oil groove 53 and is sprayed into the armature winding 40 through the first oil spray hole 51. In this way, the rotor iron core 30 can be cooled by the flow of cooling oil in both the positive and negative directions.

[0059] See Figure 5 The cooling oil flow path for cooling the armature winding 40 is as follows: Cooling oil from the oil inlet channel inside the end cover 12 enters the spray ring 60 near the end cover 12. The spray ring 60, with its evenly spaced circumferentially distributed spray holes 600, sprays the cooling oil into the oil collecting ring groove 500 on the balance plate 50 near the end cover 12. Cooling oil in the oil collecting ring groove 500 that does not flow into the core oil hole 301 enters the corresponding second oil groove 54 through the second distribution holes 57 on the balance plate 50 that communicate with each second oil groove 54. Finally, the oil is sprayed from the second spray hole 52 through the second oil groove 54. The cooling oil is sprayed onto the armature winding 40. At the same time, the cooling oil in the oil inlet channel inside the housing 10 enters the oil spray ring 60 away from the end cover 12 and sprays oil into the oil collection ring groove 500 on the balance plate 50 away from the end cover 12. The cooling oil sprayed into the oil collection ring groove 500 that does not flow into the iron core oil hole 301 enters the corresponding second oil groove 54 through the second oil distribution hole 57 on the balance plate 50 that is connected to each of the second oil grooves 54, and finally passes through the second oil groove 54 and is sprayed onto the armature winding 40 through the second oil spray hole 52. Thus, the two ends of the armature winding 40 can be cooled by spraying oil at the same time.

[0060] Based on the same inventive concept, combined with Figures 1 to 9 It is understood that this application embodiment also provides a motor assembly, including the above-described rotor cooling oil circuit structure.

[0061] Compared with the prior art, the motor assembly provided in this embodiment adopts the above-mentioned rotor cooling oil circuit structure. Part of the cooling oil in the oil inlet channel flows through the first oil distribution holes 55 on one of the balance plates 50, passes through several corresponding iron core oil holes 301, and is sprayed onto the armature winding 40 by the first oil spray holes 51 on the opposite balance plate 50. Simultaneously, another part of the cooling oil flows through the first oil distribution holes 55 on another balance plate 50, passes through the remaining corresponding iron core oil holes 301, and is sprayed onto the armature winding 40 by the first oil spray holes 51 on the opposite balance plate 50. The cooling oil flows bidirectionally through the iron core oil holes 301. The cooling oil not only improves the cooling effect on the rotor core 30, but also sprays onto the armature winding 40 through the first oil injection hole 51, thereby generating a certain cooling effect on the armature winding 40. Thus, a cooling oil passage for cooling the rotor core 30 and the armature winding 40 can be formed without occupying the internal space of the rotor shaft 20. This not only meets the needs of the drive shaft that runs coaxially inside the rotor shaft 20, making it suitable for coaxial electric drive systems, but also improves the rotor cooling effect. In addition, since no oil passage needs to be set inside the rotor shaft 20, the structure of the rotor shaft 20 can be simplified, thereby reducing the processing difficulty and cost of the rotor shaft 20.

[0062] Based on the same inventive concept, embodiments of this application also provide a vehicle including the above-described motor assembly.

[0063] Compared with the prior art, the vehicle provided in this embodiment adopts the above-mentioned rotor cooling oil circuit structure in its motor assembly. Part of the cooling oil in the oil inlet channel flows through the first oil distribution holes 55 on one of the balance plates 50, passes through several corresponding iron core oil holes 301, and is sprayed onto the armature winding 40 by the first oil injection holes 51 on the opposite balance plate 50. Simultaneously, another part of the cooling oil flows through the first oil distribution holes 55 on another balance plate 50, passes through the remaining corresponding iron core oil holes 301, and is sprayed onto the armature winding 40 by the first oil injection holes 51 on the opposite balance plate 50. The cooling oil flows bidirectionally through the iron core oil holes 301. The cooling oil in the first oil spray hole 51 not only improves the cooling effect on the rotor core 30, but also sprays onto the armature winding 40 through the first oil spray hole 51, thereby generating a certain cooling effect on the armature winding 40. Thus, a cooling oil passage for cooling the rotor core 30 and the armature winding 40 can be formed without occupying the internal space of the rotor shaft 20. This not only meets the needs of the drive shaft that runs coaxially inside the rotor shaft 20, making it suitable for coaxial electric drive systems, but also improves the rotor cooling effect. In addition, since no oil passage needs to be set inside the rotor shaft 20, the structure of the rotor shaft 20 can be simplified, thereby reducing the processing difficulty and cost of the rotor shaft 20.

[0064] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A rotor cooling oil circuit structure, characterized in that, It includes a housing (10), an armature winding (40), a rotor shaft (20), a rotor core (30) fitted onto the rotor shaft (20), and two balance plates (50) respectively located at both ends of the rotor core (30); the housing (10) is provided with an oil inlet channel, and the rotor core (30) is provided with a number of core oil holes (301) that penetrate along its axial direction evenly distributed around its circumference; The balance plate (50) is provided with a plurality of first oil distribution holes (55) and a plurality of first oil injection holes (51). The first oil distribution holes (55) on both balance plates (50) are connected to the oil inlet channel. Each of the first oil distribution holes (55) on one balance plate (50) is connected to each of the first oil injection holes (51) on the other balance plate (50) through the iron core oil hole (301). Each of the first oil injection holes (51) on both balance plates (50) sprays oil toward the armature winding (40).

2. The rotor cooling oil circuit structure as described in claim 1, characterized in that, The balance plate (50) has a plurality of first oil grooves (53) on its side wall facing the rotor core (30). One end of each first oil groove (53) is connected to one of the core oil holes (301), and the other end is connected to one of the first oil injection holes (51).

3. The rotor cooling oil circuit structure as described in claim 2, characterized in that, The balance plate (50) has an oil collecting ring groove (500) on its side wall away from the rotor core (30). The oil collecting ring groove (500) is connected to the oil inlet channel. Each of the first oil distribution holes (55) is distributed circumferentially in the oil collecting ring groove (500).

4. The rotor cooling oil circuit structure as described in claim 3, characterized in that, The housing (10) is provided with an oil injection ring (60) at both ends of the rotor core (30). Both oil injection rings (60) are connected to the oil inlet channel and are used to spray oil into the oil collection ring groove (500) on one of the balance plates (50).

5. The rotor cooling oil circuit structure as described in claim 4, characterized in that, The balance plate (50) has a raised ring (56) on its surface away from the rotor core (30), and the raised ring (56) and the peripheral wall of the rotor shaft (20) form the oil collecting ring groove (500).

6. The rotor cooling oil circuit structure as described in claim 5, characterized in that, The inner ring surface of the convex ring (56) forms an oil guiding slope (561); the oil injection ring (60) is provided with a plurality of oil injection inclined holes (600) along its circumferential direction, and each of the oil injection inclined holes (600) sprays oil toward the bottom of the oil guiding slope (561) and the oil collecting ring groove (500).

7. The rotor cooling oil circuit structure as described in claim 1, characterized in that, The balance plate (50) has a plurality of second oil grooves (54) and a plurality of second oil injection holes (52) on the side wall facing the rotor core (30). One end of each second oil groove (54) is connected to the oil inlet channel, and the other end is connected to each of the second oil injection holes (52); each of the second oil injection holes (52) sprays oil toward the armature winding (40).

8. The rotor cooling oil circuit structure as described in any one of claims 1-7, characterized in that, The housing (10) includes a main housing (11) with one open end and an end cap (12) connected to the open end of the main housing (11); wherein, the main housing (11) and the end cap (12) are respectively provided with an oil inlet channel, and the two oil inlet channels are respectively connected to the first oil distribution hole (55) on the two balance plates (50).

9. A motor assembly, characterized in that, Includes the rotor cooling oil circuit structure as described in any one of claims 1-8.

10. A vehicle, characterized in that, Includes the motor assembly as described in claim 9.

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