Motor shell, shell assembly and vehicle

Abstract

The utility model provides a motor shell, a shell assembly and a vehicle, the motor shell provided by the utility model comprises a shell main body, an armature cavity is formed in the shell main body, the shell main body is provided with at least two oil return channels, and the at least two oil return channels are communicated with the armature cavity; the at least two oil return channels are distributed at the two opposite ends of the shell body in the axial direction of the armature cavity. The service life of the motor in the vehicle is long.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a motor shell, a shell assembly applying the motor shell and a vehicle applying the shell assembly. BACKGROUND

[0002] At present, an oil-cooled motor realizes heat dissipation by directly contacting a core heating component such as an armature or a bearing with cooling oil, and is widely applied in the fields of new energy driving and high-density industrial motors.

[0003] In the related art, an oil-cooled motor generally includes a shell and an armature, an armature cavity in which the armature is installed is formed in the shell, and a passive oil return design of a single bottom oil return hole combined with a spiral flow guide rib is generally adopted on the shell. During operation, the cooling oil is driven to flow along the shell wall by centrifugal force, and finally returns to the oil circuit through the bottom oil return hole for circulation.

[0004] However, in the above oil-cooled motor, when the motor is inclined or operates at a low speed, the oil liquid is prone to stagnate at the distal end of the armature cavity due to uneven distribution of gravity, and the local oil liquid accumulation in the armature cavity causes the armature winding to be soaked in oil for a long time, thereby causing the armature temperature to be high and shortening the service life of the armature. CONTENT OF THE UTILITY MODEL

[0005] The embodiments of the present application provide a motor shell, a shell assembly and a vehicle, which can avoid the armature winding from being soaked in oil to a certain extent, so as to prolong the service life of the armature.

[0006] In a first aspect, the present application provides a motor shell, which includes a shell main body, an armature cavity is formed in the shell main body, at least two oil return channels are provided on the shell main body, and the at least two oil return channels are in communication with the armature cavity; wherein the at least two oil return channels are distributed at opposite ends of the shell main body along the axial direction of the armature cavity.

[0007] In the present application, the oil return channels are distributed at the two axial ends of the armature cavity, and no matter what posture the motor is in, the oil return channels at the two ends can utilize the combined action of gravity and centrifugal force to form a multi-path oil return channel. Specifically, when the motor is operating, the cooling oil flows to the inner wall of the shell main body under the action of centrifugal force, and the oil return channels at the two ends can simultaneously guide the oil liquid to flow back from the two axial ends quickly, thereby avoiding the stagnation of the oil liquid at the distal end caused by single-side oil return; under low-speed or inclined working conditions, the gravity makes the oil liquid more easily discharged from the oil return channel at the lower position, thereby reducing the local oil liquid accumulation in the armature cavity. In this way, not only is the oil liquid circulation path optimized, but also the risk of the armature winding being soaked in oil is reduced, so that the cooling oil can more uniformly participate in heat dissipation, effectively reduce the armature temperature, and further prolong the service life of the armature and the motor. In addition, the layout of the multiple oil return channels can also improve the oil liquid circulation efficiency, ensure that the motor can maintain stable heat dissipation performance under different working conditions, and to a certain extent, solve the reliability problem caused by uneven distribution of oil liquid in the related art.

[0008] As an optional implementation, the at least two oil return channels include a first channel and a second channel; the shaft direction of the armature cavity extends in the front-rear direction, the first channel is located at the front side of the second channel, the first channel has a first oil inlet, and the second channel has a second oil inlet; after the shell body is installed, the first oil inlet and the second oil inlet are located on the side of the armature cavity facing downward, and the position of the first oil inlet is lower than the position of the second oil inlet; wherein the opening area of the first oil inlet is greater than the opening area of the second oil inlet.

[0009] That is, the larger opening area of the first oil inlet means that it has higher oil flow capacity and can discharge more oil in unit time, combined with the position of the first channel, it can accelerate the circulation speed of the bottom oil and further reduce the risk of long-term immersion of the armature winding in oil.

[0010] As an optional implementation, the opening area of the first oil inlet is greater than or equal to 1600 square millimeters, and the opening area of the second oil inlet is greater than or equal to 803 square millimeters.

[0011] In this way, the amount of returned oil can be greater than the amount of oil entering the motor, to some extent, to avoid the accumulation of oil at the bottom of the motor shell, and to further prolong the service life of the armature.

[0012] As an optional implementation, the first oil inlet has a first center, the second oil inlet has a second center, along the shaft direction of the armature cavity, the distance between the first center and the second center is a first distance, the distance between the first center and the front end of the shell body is a second distance, and the distance between the second center and the cavity bottom wall of the armature cavity is a third distance; the first distance is 1.5 times the second distance, and the first distance is 1.3 times the third distance.

[0013] In this way, the first channel is closer to the front end of the shell body, and the second channel is relatively rearward and maintains a certain distance from the cavity bottom wall of the armature cavity. This axial misalignment distribution can cover different areas of the armature cavity and further avoid the problem of distal oil retention in the single-sided oil return design in the related art.

[0014] As an optional implementation, the shell body further has an electrical connection cavity, the electrical connection cavity is in communication with the armature cavity; the first channel further has a first oil outlet, after the shell body is installed, the first channel is inclinedly arranged, the first oil outlet is located obliquely below the first oil inlet, and the first oil outlet is located on the side of the first oil inlet away from the electrical connection cavity.

[0015] Therefore, by limiting the extension direction of the first channel, on one hand, the oil return requirement can be met, the flow of the oil flowing through the first channel is ensured to be smooth, the flow speed of the oil is improved, and the oil return efficiency is improved; on the other hand, by the inclined arrangement, interference with other structures can be avoided.

[0016] As an optional implementation, the shell body is detachably connected with an oil baffle, the oil baffle is arranged to face the first oil outlet, and an oil passing gap is formed between the oil baffle and the first oil outlet; the oil baffle has a plate surface arranged to face the first oil outlet, and a normal projection region of the first oil outlet on the plate surface falls within the plate surface.

[0017] Therefore, on one hand, the oil spilt from the gear assembly can be prevented from flowing back into the motor shell to a certain extent; on the other hand, by forming the oil passing gap, the smoothness of the cooling oil in the oil return process can be ensured, so that the cooling oil can flow through the first channel and the oil passing gap in sequence and flow into the oil pan.

[0018] As an optional implementation, the second channel further has a second oil outlet; the second channel includes an oil inlet section and an oil outlet section which are communicated in sequence and perpendicular to each other, the oil inlet section is communicated with the armature cavity, and the second oil inlet is formed on the oil inlet section, and the second oil outlet is formed on the oil outlet section; wherein, after the shell body is installed, the oil inlet section extends along the vertical direction.

[0019] The straight angle type flow channel design not only shortens the residence time of the oil in the second channel, but also enhances the flowability of the oil by direction conversion, so that the cooling oil can be returned to the oil circuit in time to circulate, and the influence of local oil retention on the heat dissipation effect is avoided

[0020] The motor shell provided in the application further includes an oil plug, and the oil plug is arranged at one end of the oil inlet section away from the second oil inlet. The oil outlet section is communicated with the middle part of the oil inlet section.

[0021] In this way, while the rapid processing of the second channel is taken into account, the bottom of the oil inlet section is sealed to avoid leakage of the cooling oil.

[0022] As an optional implementation, at any position of the second channel in the extension direction thereof, the cross-sectional shape of the radial cross section of the second channel is circular.

[0023] In this way, not only the oil return function of the second channel can be realized, but also interference with other structures in the motor shell can be avoided.

[0024] As an optional implementation, the inner side wall of the shell body is formed with a mounting portion protruding towards the center of the armature cavity; and the oil return channel is formed on the mounting portion.

[0025] Therefore, the part of the mounting portion forming the oil return channel can avoid the structural weakness of the motor shell at the position where the oil return channel is formed to some extent, thereby improving the structural strength of the motor shell.

[0026] In a second aspect, the application provides a housing assembly, comprising a transmission housing and the motor shell as described above; wherein the transmission housing is provided with a transmission cavity, and the armature cavity is communicated with the transmission cavity through at least two oil return channels.

[0027] As an optional embodiment, the motor shell is integrally mounted above the transmission housing.

[0028] The integrated structure of the housing assembly reduces the connection interface between the transmission housing and the motor shell in the traditional split structure, eliminates the tolerance accumulation problem caused by multi-component assembly, thereby enhancing the rigidity and stability of the housing assembly, and effectively reducing the noise and energy loss caused by vibration or impact during operation.

[0029] In a third aspect, the application provides a vehicle, comprising an armature, an electronic oil pump, a transmission gear assembly, and the housing assembly as described above, the armature is installed in the armature cavity, the electronic oil pump is arranged below the motor shell, and the transmission gear assembly is arranged in the transmission cavity; wherein the first oil outlet of the motor shell is arranged towards the transmission gear assembly.

[0030] The use of the above-mentioned housing assembly can reduce the sealing surface in the vehicle provided by the application, and improve the structural compactness of the vehicle. In addition, by limiting the position of the first oil outlet and the transmission gear assembly, the setting function of the oil baffle is realized, and to some extent, the oil splashed by the transmission gear assembly is prevented from flowing back into the motor shell.

[0031] As an optional embodiment, the electronic oil pump has an outer surface arranged towards the motor shell; wherein at least part of the projection area of the first oil inlet of the motor shell on the surface where the outer surface is located falls on the outer surface.

[0032] Therefore, by limiting the positional relationship between the first oil inlet and the electronic oil pump, the first channel is arranged in an inclined downward extending shape, thereby avoiding the electronic oil pump. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 A perspective structural schematic diagram of the housing assembly provided by the embodiments of the application;

[0034] Figure 2 A Figure 1 A local structural enlarged schematic diagram at A in FIG. 8;

[0035] Figure 3 A local structural schematic diagram of the vehicle provided by the embodiments of the application;

[0036] Figure 4 A plane structure schematic view of the housing assembly provided by the embodiment of the present application is shown in the figure;

[0037] Figure 5 A Figure 4 A sectional view along the direction of B-B;

[0038] Figure 6 A Figure 5 An enlarged schematic view of the partial structure at C;

[0039] Figure 7 A three-dimensional structure schematic view of the housing assembly provided by the embodiment of the present application is shown in the figure;

[0040] Figure 8 A Figure 7 An enlarged schematic view of the partial structure at D;

[0041] Figure 9 A Figure 4 A sectional view along the direction of E-E;

[0042] Figure 10 A Figure 9 An enlarged schematic view of the partial structure at F.

[0043] Explanation of reference signs:

[0044] 1, shell body; 2, oil baffle; 3, oil passing gap; 4, bolt; 5, reinforcing column; 6, oil plug;

[0045] 10, motor shell; 11, armature cavity; 12, oil return channel; O1, first center; O2, second center; L1, first distance; L2, second distance; L3, third distance; 13, power connection cavity; 14, threaded hole; 15, mounting portion; 21, plate surface; 20, electronic oil pump; 30, low-voltage plug-in; 40, oil pan; 50, transmission shell; 60, connecting plate;

[0046] 121, first channel; 122, second channel; 201, outer surface; 100, housing assembly; 200, axle housing;

[0047] 1211, first oil inlet; 1212, first oil outlet; 1221, second oil inlet; 1222, second oil outlet; 1223, oil inlet section; 1224, oil outlet section. DETAILED DESCRIPTION

[0048] The technical solutions in the present application will be clearly and completely described below with reference to the drawings. In the description of the embodiments of the present application, unless otherwise specified, " / " represents the meaning of or, for example, A / B can represent A or B: "and / or" in the text only describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0049] Hereinafter, the terms "first" and "second" are used only for descriptive purposes and cannot be understood as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features.

[0050] At present, the oil-cooled motor realizes heat dissipation by directly contacting the core heating components such as the armature and the bearing through cooling oil, and is widely used in the fields of new energy driving and high-density industrial motors.

[0051] In the related art, the oil-cooled motor generally includes a shell and an armature, an armature cavity for mounting the armature is formed in the shell, and a passive oil return design of a single-sided bottom oil return hole combined with a spiral flow guide rib is generally adopted on the shell. During operation, the cooling oil is driven to flow along the shell wall by centrifugal force, and finally returns to the oil circuit through the bottom oil return hole for circulation.

[0052] However, in the above oil-cooled motor, when the motor is inclined or operates at low speed, the oil is unevenly distributed due to gravity and is easily retained at the distal end of the armature cavity; at the same time, the cyclone generated by the high-speed rotation of the armature forms a local high-pressure area near the oil return hole, which hinders the flow of oil. The local oil accumulation in the armature cavity causes the armature winding to be immersed in oil for a long time, and the internal eddy current loss and oil viscous resistance superimpose to make the winding temperature rise exceed the limit, which shortens the service life of the armature, and further shortens the service life of the motor.

[0053] Based on this, the embodiments of the present application provide a motor shell, a shell assembly and a vehicle, by improving the oil return structure on the motor shell, to avoid the armature winding being immersed in cooling oil to a certain extent, so as to prolong the service life of the armature, and further prolong the service life of the vehicle using the armature and the vehicle using the motor.

[0054] The embodiments of the present application will be described in detail below with reference to the drawings and specific embodiments.

[0055] Please refer to Figure 1 and Figure 2 , Figure 1 the three-dimensional structure schematic diagram of the shell assembly provided by the embodiments of the present application, Figure 2 is Figure 1A local structure at the middle A is shown in an enlarged schematic view. As shown in the figure, the embodiment provides a motor shell 10, which includes a shell main body 1, an armature cavity 11 is formed in the shell main body 1, at least two oil return channels 12 are arranged on the shell wall of the shell main body 1, and the at least two oil return channels 12 are in communication with the armature cavity 11; wherein the at least two oil return channels 12 are distributed at opposite ends of the shell main body 1 along the axial direction of the armature cavity 11. That is, taking the two oil return channels 12 as an example, one oil return channel 12 is arranged close to the front end of the shell main body 1, and the other oil return channel 12 is arranged close to the rear end of the shell main body 1. Wherein, the front-rear direction please refer to the front-rear direction in Figure 1

[0056] In the related art, the single-side bottom oil return design relies on the centrifugal force to drive the oil return, when the motor is tilted or runs at low speed, the centrifugal force is weakened, and the oil is prone to accumulate at the distal end of the armature cavity (such as the end away from the oil return hole) due to the action of gravity, resulting in a decrease in the heat dissipation efficiency of the armature winding for a long time. In the embodiment, the oil return channels 12 are distributed at the axial ends of the armature cavity 11, no matter what posture the motor is in, the oil return channels 12 at both ends can utilize the combined action of gravity and centrifugal force to form a multi-path oil return channel. Specifically, when the motor is running, the cooling oil flows to the inner wall of the shell main body 1 under the action of centrifugal force, and the oil return channels 12 at both ends can guide the oil to flow back from the axial ends at the same time, avoiding the oil retention at the distal end caused by single-side oil return; under low speed or inclined working conditions, the gravity makes the oil more easily discharged from the oil return channel 12 at the lower position, thereby reducing the local oil accumulation in the armature cavity 11.

[0057] In this way, not only the oil circulation path is optimized, but also the risk of the armature winding being immersed in oil is reduced, so that the cooling oil can participate in heat dissipation more uniformly, effectively reducing the armature temperature, and thereby prolonging the service life of the armature and the motor. In addition, the layout of the multiple oil return channels 12 can also improve the oil circulation efficiency, ensuring that the motor can maintain stable heat dissipation performance under different working conditions, so as to solve the reliability problem caused by uneven oil distribution in the related art to a certain extent.

[0058] Specifically, taking the two oil return channels 12 as an example, the at least two oil return channels 12 include a first channel 121 and a second channel 122; the axial direction of the armature cavity 11 extends along the front-rear direction, the first channel 121 is located at the front side of the second channel 122, the first channel 121 has a first oil inlet 1211, and the second channel 122 has a second oil inlet 1221, that is, the cooling oil flows into the first channel 121 through the first oil inlet 1211, and the cooling oil flows into the second channel 122 through the second oil inlet 1221.

[0059] ​Further, in order to avoid oil accumulation in the bottom of the armature cavity 11 to some extent, in some optional embodiments, the first oil inlet 1211 has a first center O1, the second oil inlet 1221 has a second center O2, along the axial direction of the armature cavity 11, the distance between the first center O1 and the second center O2 is a first distance L1, the distance between the first center O1 and the front end of the shell body 1 is a second distance L2, the distance between the second center O2 and the bottom wall of the armature cavity 11 is a third distance L3, the first distance L1 is 1.5 times the second distance L2, and the first distance L1 is 1.3 times the third distance L3.

[0060] Firstly, through the limitation of the proportional relationship, the first channel 121 is closer to the front end of the shell body 1, and the second channel 122 is relatively rearward and maintains a certain distance from the bottom wall of the armature cavity 11. This axial staggered distribution can cover different areas of the armature cavity 11 and further avoid the problem of oil retention at the distal end in the related art.

[0061] Specifically, when the motor is running, the centrifugal force drives the cooling oil to flow to the inner wall of the shell body 1. The first channel 121 at the front end can preferentially guide the oil near the input end of the motor to flow back quickly, and the second channel 122 at the rear side can consider the oil at the rear and bottom of the armature cavity 11 to flow out, forming a front-rear coordinated oil return path.

[0062] In addition, the numerical ratio of the first distance L1, the second distance L2, and the third distance L3 causes the first channel 121 and the second channel 122 to form a gradient pressure difference in the axial direction of the armature cavity 11, promoting the oil to flow at a reasonable flow rate under different working conditions, and to some extent, avoiding local overheating or oil circulation dead angle caused by uneven flow rate. In this way, not only the heat dissipation stability of the motor under complex working conditions is improved, but also the reliability of the oil circulation system is strengthened from the structural level, so as to further prolong the service life of the armature and the motor.

[0063] It should be noted that in the manufacturing process of the motor shell 10, casting, injection molding and other processes are usually used, and the mold or core needs to be smoothly removed from the formed motor shell 10. If the inner wall of the motor shell 10 does not have a draft angle, the friction between the mold and the inner wall of the motor shell 10 will increase, causing demolding difficulty, and even possibly scratching or damaging the inner surface of the motor shell 10, affecting the size accuracy and surface quality of the armature cavity 11.

[0064] Therefore, in the present embodiment, the inner wall of the armature cavity 11 has a draft angle, and after the shell body 1 is installed, the first oil inlet 1211 and the second oil inlet 1221 are both located on the downward side of the armature cavity 11, and the position of the first oil inlet 1211 is lower than that of the second oil inlet 1221. Under the action of gravity, the cooling oil will flow more to the first oil inlet 1211 of the first channel 121, at this time, in order to make the size of the first oil inlet 1211 meet the oil inlet amount at this position, to some extent, avoid poor oil return. In some embodiments, the opening area of the first oil inlet 1211 is greater than that of the second oil inlet 1221.

[0065] Among them, the low layout of the first channel 121 makes it naturally become the main drainage point of oil accumulation under the action of gravity, especially when the motor is tilted or running at low speed, the oil is easy to collect to the bottom due to gravity, at this time, the lower first channel 121 can receive and discharge the accumulated oil by virtue of its position advantage. The larger opening area of the first oil inlet 1211 means higher oil flow capacity, which can discharge more oil in unit time, further accelerate the circulation speed of the bottom oil, and further reduce the risk of long-term immersion of the armature winding in oil.

[0066] Secondly, when the motor is running at high speed, the centrifugal force drives the oil to flow to the inner wall of the shell body, at this time, the upper second channel 122 can assist in discharging the oil accumulated in the upper part of the shell body 1 due to uneven distribution of centrifugal force, and the large opening design of the lower first channel 121 can ensure stable oil return efficiency under high flow state; In low speed or static state, gravity dominates oil flow, the lower first channel 121 becomes the main path of oil return by virtue of its low position and large opening, and the upper second channel 122 can avoid residual oil at the top to some extent. In this way, not only the oil distribution requirements under different working conditions are covered, but also the uneven heat dissipation problem caused by too fast or too slow local flow is avoided through differential control of flow.

[0067] At the same time, the smaller opening of the upper second channel 122 can to some extent avoid the local negative pressure caused by too large flow, maintain the pressure balance in the shell body 1, and to some extent ensure that the oil can effectively participate in heat dissipation at different positions. In this way, the heat dissipation stability of the motor under complex working conditions can be improved, and the service life of the armature and the motor can be further prolonged.

[0068] In some optional embodiments, the opening area of the first oil inlet 1211 is greater than or equal to 1600 square millimeters, and the opening area of the second oil inlet 1221 is greater than or equal to 803 square millimeters. In a specific embodiment of the present embodiment, the opening area of the first oil inlet 1211 is 1600 square millimeters, and the opening area of the second oil inlet 1221 803 square millimeters.

[0069] In order to more intuitively illustrate the influence of the opening area of the first oil inlet 1211 and the opening area of the second oil inlet 1221 on the oil return amount, the following Table 1 is given for illustration, where the opening area of the first oil inlet 1211 and the opening area of the second oil inlet 1221 are 1600 square millimeters and 803 square millimeters respectively. Table 1 is a table of oil temperature and maximum pump flow of the electronic oil pump. It should be noted that the motor shell 10 provided in the embodiment is applied to a dual-motor driving system, and the flow of the oil liquid evenly distributed to each motor is half of the total flow. As can be seen from Table 1:

[0070] When the cooling oil temperature is 20℃, the electronic oil pump can reach a peak flow of 15L / min, and the average flow distributed to each motor is 15÷2=7.5L / min. At this time, the gear oil flow rate is 4m / min, and the oil return flow is (2403×10 -6 )m 2 ×5m / min=0.0096m 3 / min=9.6L / min>

[0071] The motor oil intake is 7.5L / min;

[0072] When the cooling oil temperature is 40℃, the electronic oil pump can reach a peak flow of 23L / min, and the average flow distributed to each motor is 23÷2=11.5L / min. At this time, the gear oil flow rate is 6m / min, and the oil return flow is (2403×10 -6 )m 2 ×6m / min=0.0144m 3 / min=14.4L / min>

[0073] The motor oil intake is 11.5L / min;

[0074] When the cooling oil temperature is 60℃ and above, the electronic oil pump can reach a peak flow of 40L / min, and the average flow distributed to each motor is 40÷2=20L / min. At this time, the gear oil flow rate is 8.5m / min, and the oil return flow is (2403×10 -6 )m 2 ×8m / min=0.0204m 3 / min=20.4L / min> The motor oil intake is 20L / min.

[0075] It should be noted that as the oil temperature rises, the viscosity of the gear oil decreases, the flow rate increases, and the higher the flow rate, the faster the oil return. Therefore, if the gear oil at 60℃ can meet the requirement of oil return amount≥20L / min at a flow rate of 8.5m / min, it can be ensured that there is no oil in the shell above 60℃. Therefore, the cases of oil temperature at 80℃, 100℃ and 120℃ are not described in detail here.

[0076]

[0077] Table 1 Relationship between oil temperature and maximum pump flow rate of electronic oil pump

[0078] Please continue to combine Figure 3 , Figure 3 This is a schematic diagram of a partial structure of the vehicle provided in an embodiment of this application. Figure 3 As shown, in this embodiment, an electronic oil pump 20 is disposed below the motor housing 10, and the electronic oil pump 20 has an outer surface 201 facing the motor housing 10; wherein, at least a portion of the orthographic projection area of ​​the first oil inlet 1211 of the motor housing 10 on the surface of the outer surface 201 falls on the outer surface 201. That is to say, if the first channel 121 is opened vertically downward, it will interfere with the electronic oil pump 20, and oil return will be impossible.

[0079] Based on this, please continue to combine Figures 4 to 6 , Figure 4 This is a schematic plan view of the housing assembly provided in an embodiment of this application. Figure 5 for Figure 4 Cross-sectional view along the BB direction. Figure 6 for Figure 5 A magnified view of the partial structure at point C. In some embodiments, the housing body 1 also has a power receiving cavity 13, which is connected to the armature cavity 11; the first channel 121 also has a first oil outlet 1212. After the housing body 1 is installed, the first channel 121 is inclined, and the first oil outlet 1212 is located diagonally below the first oil inlet 1211, and the first oil outlet 1212 is located on the side of the first oil inlet 1211 away from the power receiving cavity 13. The power receiving cavity 13 can accommodate the wiring harness that electrically connects the armature and the low-voltage plug 30. Here, no specific restrictions are placed on the wiring harness. In this way, by restricting the extension direction of the first channel 121, on the one hand, the oil return requirement can be met, ensuring the smoothness of the oil flowing through the first channel 121, improving the oil flow speed, and improving the oil return efficiency; on the other hand, by being inclined, interference with other structures can be avoided. 。 In this way, the arrangement of the electronic oil pump 20 will not be affected, the overall structural compactness of the vehicle will be improved, and the modification cost of the motor housing 10 provided in this embodiment will be lower.

[0080] It should be noted that, as Figure 6 As shown, in some embodiments, due to the structural design of the motor housing 10, the rear half of the first channel 121 extends upward, but the first oil outlet 1212 is still located diagonally below the first oil inlet 1211.

[0081] Of course, in other embodiments, the rear half of the first passage 121 can also extend downward or horizontally under the influence of the structural design of the motor housing 10, and in this case, the first oil outlet 1212 is still located obliquely below the first oil inlet 1211.

[0082] That is, the extension direction of the rear half of the first passage 121 can be horizontal, downward or upward, as long as the first oil outlet 1212 is located obliquely below the first oil inlet 1211 to meet the purpose of the present embodiment. Here, the shape of the second passage 121 is not specifically limited.

[0083] Further, the structural design in the armature cavity 11, the first oil inlet 1211 is provided as a square opening in the present embodiment, and the side length of the square opening is 40 mm, and is formed by casting in such an integrated manner to reduce the machining process of the motor housing 10 and reduce the machining cost of the motor housing 10. It can be understood that during the machining process, there may be some errors in the machining size of the first oil inlet 1211, therefore, for the first oil inlet 1211, the side length is set to be greater than or equal to 40 mm and less than or equal to 42 mm interval can meet the purpose of the present embodiment.

[0084] For example, the side length of the first oil inlet 1211 can be 40 mm, 41 mm, 42 mm, etc. Here, the shape and size of the first oil inlet 1211 are not specifically limited.

[0085] It should be noted that since the first oil outlet 1212 is directly opposite the transmission gear assembly (not shown in the figure), the transmission gear assembly will stir up oil when it is running at high speed, and the oil is not filtered and contains iron filings. However, the first passage 121 is difficult to avoid the transmission gear assembly, so please continue to combine Figure 7 and Figure 8 , Figure 7 the perspective view of the shell assembly provided in the present application, Figure 8 is Figure 7 the enlarged schematic view of the local structure at D.

[0086] In some embodiments, in order to avoid the oil splashed out by the transmission gear assembly at high speed from flowing back into the motor shell 10, causing cleanliness problems. The oil baffle 2 can be detachably connected to one side of the shell body 1, the oil baffle 2 is arranged facing the first oil outlet 1212, and an oil passing gap 3 is formed between the oil baffle 2 and the first oil outlet 1212. In this way, on the one hand, it can avoid the oil splashed out by the transmission gear assembly from flowing back into the motor shell 10 to a certain extent; on the other hand, through the formation of the oil passing gap 3, the smoothness of the cooling oil during the oil return process can be ensured, so that the cooling oil can flow through the first channel 121 and the oil passing gap 3 to the oil pan 40 in turn. It should be noted that the structure of the oil pan 40 is described in the following description.

[0087] It can be understood that in order to improve the oil blocking effect of the oil baffle 2, the oil baffle 2 needs to completely block the first oil outlet 1212, that is, the oil baffle 2 has a plate surface 21 arranged facing the first oil outlet 1212, and the orthographic projection area of the first oil outlet 1212 on the plate surface 21 falls within the plate surface 21. In this way, in the direction perpendicular to the axis of the first oil outlet 1212, the first oil outlet 1212 can be completely blocked, and the oil splashed out by the transmission gear assembly can be further prevented from flowing back into the motor shell 10 through the first oil outlet 1212.

[0088] It should be noted that the above orthographic projection can be understood as the projection line being perpendicular to the projection surface, that is, the above central axis of the first oil outlet 1212 is perpendicular to the plate surface 21.

[0089] The connection between the oil baffle 2 and the shell body 1 can be achieved by using threaded fasteners such as bolts 4 to connect the oil baffle 2 and the shell body 1. It can be understood that at the connection between the shell body 1 and the oil baffle 2, that is, at the cooperation between the shell body 1 and the bolt 4, due to the opening of the threaded hole 14, the structural strength of the shell body 1 at this position will be reduced. Therefore, in order to improve the structural strength of the shell body 1 at the position where the threaded hole 14 is opened, a reinforcing column 5 integrally formed with the shell body 1 can be arranged around the first oil outlet 1212, and the threaded hole 14 is opened on the reinforcing column 5. The oil baffle 2 is tightly attached to the reinforcing column 5. Since the reinforcing column 5 at least partially protrudes from the first oil outlet 1212, an oil passing gap 3 is formed between the oil baffle 2 and the first oil inlet 1212. In this way, the structural strength of the shell body 1 can be improved, and the structural strength of the motor shell 10 provided in the embodiment can be improved.

[0090] Further, please continue to combine Figure 9 and Figure 10 , Figure 9 for Figure 4 the sectional view along the E-E direction, Figure 10 for Figure 9The local structure at F is shown in an enlarged view. The second channel 122 also has a second oil outlet 1222; the second channel 122 includes an oil inlet section 1223 and an oil outlet section 1224 that are sequentially connected and perpendicular to each other, the oil inlet section 1223 is connected with the armature cavity 11, and the second oil inlet 1221 is formed on the oil inlet section 1223, and the second oil outlet 1222 is formed on the oil outlet section 1224; wherein, after the shell body 1 is installed, the oil inlet section 1223 extends in the vertical direction, and the oil outlet section 1224 communicates with the middle part of the oil inlet section 1223. That is, the oil outlet section 1224 extends in the horizontal direction.

[0091] The vertically extending oil inlet section 1223 uses gravity to enable the oil liquid in the armature cavity 11, especially the bottom accumulated oil liquid, to more directly flow into the oil inlet section 1223, especially in the case of motor inclination or low speed operation, the vertically extending oil inlet section 1223 can maximize the flow resistance of the oil liquid caused by uneven gravity distribution, to ensure that the oil liquid at the far end can quickly gather to the second oil inlet 1221.

[0092] In addition, after the oil liquid enters from the vertically extending oil inlet section 1223, the vertically turned oil outlet section 1224 changes the flow direction of the oil liquid, and under the action of the centrifugal force or vibration generated during the operation of the motor, the oil liquid can be more efficiently discharged from the oil outlet section 1224, reducing the vortex or stagnation caused by the sudden change of the flow direction. The design of the straight angle type flow channel not only shortens the residence time of the oil liquid in the second channel 122, but also enhances the flowability of the oil liquid through direction conversion, to ensure that the cooling oil can be returned to the oil circuit in time, avoiding the influence of local oil liquid stagnation on the heat dissipation effect.

[0093] When the oil inlet section 1223 is processed, it is processed from the outside to the inside, so the bottom end of the oil inlet section 1223 is open, and during the operation of the motor, the bottom end of the oil inlet section 1223 needs to be plugged to ensure a certain sealing performance. Therefore, the motor shell 10 provided in the embodiment further includes an oil plug 6, which is arranged at one end of the oil inlet section 1223 away from the second oil inlet 1221, that is, the bottom end of the second oil inlet 1221 in the embodiment. In this way, while considering the rapid processing of the second channel 122, the bottom of the oil inlet section 1223 is sealed to avoid leakage of the cooling oil.

[0094] Since other structures in the motor shell 10 need to be avoided, in the embodiment, the cross-sectional shape of the second channel 122 in the radial direction of the second channel 122 is circular at any position in the extension direction of the second channel 122. Of course, in other embodiments, the cross-sectional shape of the second channel 122 can also be other shapes, and here the cross-sectional shape of the second channel 122 is not specifically limited.

[0095] In the specific implementation of the embodiment, in order to meet the size of the opening area of the second oil inlet 1221, the diameter of the second channel 122 is in the interval of greater than or equal to 32 mm and less than or equal to 34 mm. For example, the diameter of the second channel 122 can be 32 mm, 33 mm, 34 mm, etc. Here, the diameter of the second channel 122 is not specifically limited.

[0096] That is, in the embodiment, the shapes of the first oil inlet 1211 and the second oil inlet 1221 are different.

[0097] For example, the first oil inlet 1211 can adopt a larger opening area or a flow guide type structure, and in a low speed or inclined working condition, the bottom accumulated cooling oil can be more efficiently guided into the first channel 121 by virtue of the advantage of gravity, so as to reduce the oil immersion time of the armature winding; and the second oil inlet 1221 can be designed as a smaller opening or a flow limiting type structure, and in a high speed centrifugal force dominated state, excessive cooling oil is avoided from flowing in, so as to cause pressure imbalance in the top region and ensure reasonable distribution of cooling oil on the upper and lower parts of the shell body 1.

[0098] For another example, the first oil inlet 1211 adopts a horn mouth or an inclined design, which can expand the cooling oil collection range and reduce the local resistance at the inlet, so as to promote the convergence of the bottom cooling oil to the first channel 121; and if the second oil inlet 1221 adopts a right angle or a contraction structure, the cooling oil can be more effectively thrown into the second channel 122 by the centrifugal force in a high speed rotation state, so as to avoid the vortex or cavitation phenomenon caused by the shape mutation.

[0099] It can be understood that, in order to mount the armature, in some embodiments, the inner side wall of the shell body 1 is formed with a mounting portion 15 protruding towards the center of the armature cavity 11; and part of the oil return channel 12 is formed on the mounting portion 15. In the embodiment, part of the first channel 121 and part of the second channel 122 are formed on the mounting portion 15. In this way, the part of the oil return channel 12 formed by the mounting portion 15 can to some extent avoid the structural weakness of the motor shell 10 at the formed part of the oil return channel 12, so as to improve the structural strength of the motor shell 10 provided in the embodiment.

[0100] The embodiment also provides a housing assembly 100, which comprises a transmission housing 50 and the motor shell 10 in the above-mentioned embodiments; wherein the transmission housing 50 is provided with a transmission cavity, and the armature cavity 11 is communicated with the transmission cavity through at least two oil return channels 12. The transmission gear assembly in the above-mentioned embodiments is mounted in the transmission cavity.

[0101] Further, the motor shell 10 is integrally mounted on the obliquely upper side of the transmission housing 50.

[0102] The integrated structure of the housing assembly 100 reduces the connection interface between the transmission housing and the motor housing in the traditional split structure, eliminates the tolerance accumulation problem caused by multi-component assembly, thereby enhancing the rigidity and stability of the housing assembly 100, and effectively reducing the noise and energy loss caused by vibration or impact during operation. Moreover, the integrated structure can reduce the number of components and assembly processes, so that the housing assembly 100 provided by the embodiment has lower manufacturing cost and higher manufacturing efficiency.

[0103] The embodiment also provides a vehicle comprising an armature (not shown in the figure), an electronic oil pump 20, a transmission gear assembly, and the housing assembly 100 in the above-mentioned embodiment. The armature is installed in the armature cavity 11, and the electronic oil pump 20 is arranged below the motor shell 10.

[0104] The first oil outlet 1212 is arranged towards the transmission gear assembly, and the electronic oil pump 20 has an outer surface 201 arranged towards the motor shell 10. At least part of the projection area of the first oil inlet 1211 on the surface where the outer surface 201 is located falls on the outer surface 201. In this way, it is necessary to arrange an oil baffle 2 at the first oil outlet 1212 to prevent the oil splashed by the transmission gear assembly from flowing back into the motor shell 10. Moreover, due to the arrangement position of the electronic oil pump 20, the first channel 121 needs to be arranged in an inclined extension shape.

[0105] It should be noted that the vehicle provided by the embodiment should also include an axle housing 200 connected to the housing assembly 100. Specifically, a connecting plate 60 extending along the outer edge of the housing assembly 100 is arranged at the connection position of the transmission housing 50 and the motor shell 10, and the axle housing 200 is connected to the connecting plate 60. The axle housing 200 and the transmission housing 50 form an oil pan 40. In the above-mentioned embodiment, the oil flowing out through the first channel 121 and the second channel 122 flows into the oil pan 40.

[0106] In addition, the vehicle provided by the embodiment improves the compactness of the internal structure of the vehicle by adopting the integrated structure of the housing assembly 100, reduces the overall volume of the power assembly, and can more efficiently integrate the power system, thereby leaving space for other components inside the vehicle, reducing the weight of the system, and helping to improve the overall energy efficiency ratio of the vehicle. Moreover, the number of sealing surfaces is reduced, the risk of oil leakage is reduced, the reliability and service life of the vehicle are improved, and the maintenance process is simplified.

[0107] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A motor housing, characterized in that, The shell body includes an armature cavity formed therein, and at least two oil return channels are provided on the shell body, with the at least two oil return channels communicating with the armature cavity; At least two of the oil return channels are distributed along the axial direction of the armature cavity at opposite ends of the housing body.

2. The motor housing according to claim 1, characterized in that, At least two return oil channels, including a first channel and a second channel; The armature cavity extends axially in the front-rear direction. The first channel is located in front of the second channel. The first channel has a first oil inlet, and the second channel has a second oil inlet. After the housing body is installed, both the first oil inlet and the second oil inlet are located on the downward side of the armature cavity, and the position of the first oil inlet is lower than the position of the second oil inlet. The opening area of ​​the first oil inlet is larger than the opening area of ​​the second oil inlet.

3. The motor housing according to claim 2, characterized in that, The opening area of ​​the first oil inlet is greater than or equal to 1600 square millimeters; and / or, The opening area of ​​the second oil inlet is greater than or equal to 803 square millimeters; and / or, The first oil inlet has a first center, and the second oil inlet has a second center. Along the axial direction of the armature cavity, the distance between the first center and the second center is a first distance, the distance between the first center and the front end of the housing body is a second distance, and the distance between the second center and the bottom wall of the armature cavity is a third distance. The first distance is 1.5 times the second distance, and the first distance is 1.3 times the third distance.

4. The motor housing according to claim 2, characterized in that, The shell body also has a power receiving cavity, which is connected to the armature cavity; The first channel also has a first oil outlet. After the housing body is installed, the first channel is inclined, the first oil outlet is located diagonally below the first oil inlet, and the first oil outlet is located on the side of the first oil inlet away from the electrical connection cavity. An oil baffle is detachably connected to the shell body. The oil baffle faces the first oil outlet, and an oil passage gap is formed between the oil baffle and the first oil outlet. The oil baffle has a plate surface facing the first oil outlet, and the orthographic projection area of ​​the first oil outlet on the plate surface falls within the plate surface.

5. The motor housing according to any one of claims 2 to 4, characterized in that, The second channel also has a second oil outlet; The second channel includes an oil inlet section and an oil outlet section that are connected in sequence and perpendicular to each other. The oil inlet section is connected to the armature cavity, and the second oil inlet is formed on the oil inlet section and the second oil outlet is formed on the oil outlet section. After the main body of the shell is installed, the oil inlet section extends in the vertical direction.

6. The motor housing according to claim 5, characterized in that, It also includes an oil plug, which is disposed at the end of the oil inlet section away from the second oil inlet, and the oil outlet section is connected to the middle of the oil inlet section; and / or, The cross-sectional shape of the second channel at any position along its own extension direction is circular.

7. The motor housing according to any one of claims 1 to 4, characterized in that, A mounting portion protruding toward the center of the armature cavity is formed on the inner sidewall of the housing body; The oil return channel is partially formed on the mounting portion.

8. A housing assembly, characterized in that, Includes a transmission housing and a motor housing as described in any one of claims 1 to 7; The transmission housing contains a transmission chamber, and the armature chamber is connected to the transmission chamber via at least two return oil channels; and / or, The motor housing is integrally mounted on the upper side of the transmission housing.

9. A vehicle, characterized in that, The device includes an armature, an electronic oil pump, a transmission gear assembly, and the housing assembly as described in claim 8, wherein the armature is installed in the armature cavity, the electronic oil pump is disposed below the motor housing, and the transmission gear assembly is disposed in the transmission cavity; The first oil outlet of the motor housing is positioned facing the transmission gear assembly.

10. The vehicle according to claim 9, characterized in that, The electronic oil pump has an outer surface facing the motor housing; Wherein, at least a portion of the orthographic projection area of ​​the first oil inlet of the motor housing onto the surface of the outer surface falls on the outer surface.

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