Oil-cooled motor end cover, motor and vehicle

Abstract

The utility model provides an oil cooling motor end cover, a motor and a vehicle, the oil cooling motor end cover comprises a cover main body, an oil storage cavity is arranged in the cover main body, the cover main body is provided with at least two oil ducts around the oil storage cavity, inlets of the oil ducts are used for communicating with an oil inlet pipe, and outlets of the oil ducts are communicated with the oil storage cavity; the at least two oil channels are symmetrically arranged relative to the first center face of the oil storage cavity. According to the vehicle adopting the dual-motor driving system, the manufacturing cost can be reduced and the manufacturing efficiency can be improved by adopting the oil-cooled motor end cover provided by the invention.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to an oil-cooled motor end cover, a motor using the oil-cooled motor end cover, and a vehicle using the motor. Background Technology

[0002] Currently, dual-motor drive systems have become the main configuration for electric vehicles due to their efficient power distribution capabilities, excellent handling performance, and safety features.

[0003] In related technologies, vehicles with dual-motor configurations typically require separate end cap structures for each motor. Specifically, both motors are installed at an angle and require oil supply from above, with the oil inlet pipes located at the top. To accommodate the installation and oil supply directions, the end cap structures for the two motors differ.

[0004] However, due to the different structures of the two motor end caps, more mold development costs are required for the two motor end cap structures, which increases the manufacturing cost of the dual-motor drive system. Moreover, during the vehicle assembly process, the two motor end caps need to be strictly distinguished, which increases the overall assembly difficulty of the vehicle and reduces the overall assembly efficiency. Utility Model Content

[0005] This application provides an oil-cooled motor end cover, a motor, and a vehicle, which can not only reduce the manufacturing cost of the dual-motor drive system in the vehicle, but also reduce the overall assembly difficulty of the vehicle and improve the overall assembly efficiency of the vehicle.

[0006] In a first aspect, this application provides an oil-cooled motor end cover, including a cover body, an oil storage cavity provided inside the cover body, and at least two oil passages provided around the oil storage cavity. The inlet of the oil passage is used to connect to an oil inlet pipe, and the outlet of the oil passage is connected to the oil storage cavity. The at least two oil passages are symmetrically arranged with respect to a first center plane of the oil storage cavity.

[0007] As an optional implementation, the cover body includes a first body portion and a second body portion connected together. The second body portion has a mounting hole and a first central axis extending along its axial direction. The first central surface of the oil storage cavity passes through the first central axis. The oil passage has a second central axis extending radially along the second body portion. The second central axes of at least two oil passages intersect at a symmetrical point. The symmetrical point is located on the first central axis.

[0008] As an optional implementation, the cover body further includes an outer edge and at least two oil passages. The outer edge is formed on the periphery of the cover body. At least a portion of the oil passages are formed within the oil passages. One end of the oil passage is connected to the second body portion, and the other end of the oil passage extends to and connects to the outer edge. In the axial direction of the second body portion, the oil passage protrudes from the end face of the second body portion. In the radial direction of the second body portion, the oil passage protrudes from the outer peripheral surface of the second body portion.

[0009] As an optional implementation, the oil passage has an opening at the end of the second main body that is radially away from the second main body. The opening communicates with the oil passage and is coaxially arranged with the outlet of the oil passage. The axis of the opening is perpendicular to the axis of the inlet of the oil passage. A detachable plug is provided at the opening.

[0010] As an optional implementation, the first main body has an inspection port and a plug-in mounting port for installing low-voltage plugs. The inspection port has a third central axis extending radially along the second main body, which intersects with the first central axis. The first center surface of the oil storage cavity passes through the third central axis. The inner side of the second main body has several wire harness fixing parts, each with a first fixing hole for fixing the wire harness. The inner side of the second main body has multiple first reinforcing ribs arranged circumferentially at intervals. At least two of the first reinforcing ribs correspond one-to-one with at least two oil passages, and the first reinforcing ribs are connected to the middle of the corresponding oil passages. The inner side of the cover body also has a second reinforcing rib located between the second main body and the first main body, with a second fixing hole for fixing the wire harness.

[0011] Secondly, this application provides an electric motor, including a housing, the aforementioned oil-cooled motor end cover, and at least one oil inlet pipe; the oil-cooled motor end cover and at least one oil inlet pipe are both installed on the housing, the inlet of at least one oil inlet pipe is connected to the oil inlet pipe, and the oil inlet pipe is connected to a corresponding oil passage; wherein, the diameter of the oil passage corresponds to the outer diameter of the oil inlet pipe.

[0012] As an optional implementation, the motor provided in this application further includes a bearing, a resolver stator, an oil guide, and a bearing pressure plate; the second main body of the cover body has a mounting hole, which includes a first hole segment, a second hole segment, and a third hole segment connected in sequence. The bearing is installed in the first hole segment, the resolver stator is installed in the second hole segment, and the oil guide is installed in the third hole segment; the bearing pressure plate presses against the end of the bearing away from the oil guide, and the oil guide presses against the resolver stator; wherein, the end of the bearing away from the oil guide protrudes from the first hole segment, and the protrusion length is greater than or equal to 0.18 mm and less than or equal to 0.4 mm.

[0013] As an optional implementation, one end of the surface oil guide of the resolver stator protrudes from the second hole section, and the protrusion length is greater than or equal to 0.2 mm and less than or equal to 0.8 mm.

[0014] As an optional implementation, the motor provided in this application also includes a low-voltage plug and a wiring harness. The low-voltage plug is disposed in the plug mounting port of the cover body, and the wiring harness is electrically connected to the resolver stator and the low-voltage plug. A wiring harness fixing part is provided on the inner side of the second main body. The wiring harness fixing part is located on the periphery of the first hole segment. A first fixing hole is provided on the wiring harness fixing part. A second reinforcing rib is also provided on the inner side of the cover body. A second fixing hole is provided on the second reinforcing rib. The wiring harness is fixedly connected to the first fixing hole and the second fixing hole respectively.

[0015] As an optional implementation, the motor provided in this application also includes fasteners, which are sequentially inserted through the oil guide, the resolver stator, and the second main body to connect the oil guide and the resolver stator to the oil-cooled motor end cover.

[0016] As an optional implementation, the motor provided in this application further includes a rotating shaft, a resolver rotor, and two washers. The rotating shaft has a shaft hole, and a portion of the oil guide extends into the shaft hole. The rotating shaft has a first shaft section with a uniform diameter. The bearing, resolver rotor, and two washers are all fitted onto the first shaft section. The resolver rotor is located inside the resolver stator. The resolver stator has a fourth centerline extending radially along the second main body, and the resolver rotor has a fifth centerline extending radially along the second main body. The two washers abut against opposite ends of the resolver rotor so that the fourth centerline coincides with the fifth centerline.

[0017] As an optional implementation, the motor provided in this application also includes an armature, which is mounted on the housing; the inner side of the second main body is provided with a plurality of first reinforcing ribs, which are located around the first hole segment and are arranged at intervals along the circumference of the first hole segment, and each first reinforcing rib has a notch formed to avoid the armature.

[0018] Thirdly, this application provides a vehicle including an axle, the axle including an axle housing and at least two of the above-mentioned motors, the at least two motors being connected together through the axle housing, and the at least two motors being arranged at intervals around the central axis of the axle housing; wherein, the first central surface of the oil reservoir passes through the central axis of the axle housing.

[0019] In the oil-cooled motor end cover, motor, and vehicle provided in this application, the two oil passages of the oil-cooled motor end cover are symmetrically arranged with respect to the first center plane of the oil reservoir. In other words, the oil-cooled motor end cover adopts a symmetrical double-oil-passage layout design. Therefore, when the oil-cooled motor end cover provided in this application is applied to a vehicle with a dual-motor drive system, the oil-cooled motor end covers for both motors can be made using the same mold and tooling fixture. Compared with related technologies where separate molds need to be developed for each oil-cooled motor end cover, the structural design of the oil-cooled motor end cover in this application can reduce the manufacturing cost of the dual-motor drive system.

[0020] Meanwhile, the symmetrical design of the dual oil passages eliminates the need to distinguish between the two oil-cooled motor end caps when assembling the dual-motor drive system, which improves the assembly efficiency of the dual-motor drive system and the vehicle. Moreover, it reduces the risk of human error during the assembly process. Attached Figure Description

[0021] Figure 1 A three-dimensional structural schematic diagram of the oil-cooled motor end cover provided in an embodiment of this application;

[0022] Figure 2 A schematic diagram of the planar structure of the oil-cooled motor end cover provided in an embodiment of this application;

[0023] Figure 3 A three-dimensional structural schematic diagram of the oil-cooled motor end cover provided in an embodiment of this application from another perspective;

[0024] Figure 4 A schematic diagram of the planar structure of the oil-cooled motor end cover provided in an embodiment of this application from another perspective;

[0025] Figure 5 A schematic diagram of the planar structure of the motor provided in an embodiment of this application;

[0026] Figure 6 for Figure 5 A cross-sectional view along the AA direction;

[0027] Figure 7 for Figure 6 Enlarged schematic diagram of the local structure at point B;

[0028] Figure 8 for Figure 2 A sectional view along the CC direction;

[0029] Figure 9 This is a schematic diagram of a partial structure of a vehicle provided in an embodiment of this application.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Cover body; 2. Oil passage; 3. Sealing head; O. Symmetry point;

[0032] 10. Oil-cooled motor end cover; 20. Shaft; 11. First main body; 12. Second main body; L1. First central axis; 13. Outer edge; 14. Oil passage; 15. Wiring harness fixing part; 16. First reinforcing rib; 17. Second reinforcing rib; 21. First oil passage section; 22. Second oil passage section; L2. Second central axis; 30. Low-pressure plug; 40. Inspection cover; 50. Oil inlet pipe; 60. Housing; 70. Bearing; 80. Resolver stator; 90. Oil guide; L3. Third central axis; L4. Fourth central axis; L5. Fifth central axis;

[0033] 111. Inspection port; 112. Insertion port; 121. Mounting hole; 122. Mounting part; 123. Annular boss; 141. First oil passage section; 142. Second oil passage section; 151. First fixing hole; 161. Notch; 171. Second fixing hole; 221. Opening; 110. Bearing pressure plate; 120. Oil reservoir; 130. Oil reservoir cover; 140. Fastener; 150. Resolver rotor; 160. Washer; 170. Armature; 100. Motor; 200. Axle; 201. Shaft hole; 202. First shaft section;

[0034] 1211, First hole section; 1212, Second hole section; 1213, Third hole section; 1214, First sub-hole; 1215, Second sub-hole; 1216, Fourth hole section; 1217, Stop surface; 1221, Inner end face; 1222, Outer end face. Detailed Implementation

[0035] The technical solutions in this application will be clearly and thoroughly described below with reference to the accompanying drawings. In the description of the embodiments of this application, unless otherwise stated, " / " means "or," for example, A / B can mean A or B. "And / or" in the text is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more than two.

[0036] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0037] Currently, dual-motor drive systems have become the primary configuration for electric vehicles due to their efficient power distribution capabilities, excellent handling performance, and safety features. By placing two motors on the front and rear axles (or on either side of the same axle), a dual-motor system enables features such as all-wheel drive and torque vectoring control, improving the vehicle's power performance and energy efficiency. Simultaneously, the dual-motor structure helps optimize vehicle weight distribution and reduce transmission losses; therefore, dual-motor drive systems are widely used in pure electric and hybrid vehicles.

[0038] In related technologies, vehicles with dual-motor configurations typically require separate end cap structures for each motor. Specifically, both motors are installed at an angle and require oil supply from above, with the oil inlet pipes located at the top. To accommodate the installation and oil supply directions, the end cap structures for the two motors differ.

[0039] The two motor end caps mentioned above have different structures, requiring each to be manufactured with an independent mold. Furthermore, specialized tooling fixtures need to be developed for different assembly directions, increasing the manufacturing cost of the dual-motor drive system. Secondly, during vehicle assembly, the two motor end caps must be strictly distinguished, increasing the operational complexity and error risk for assembly personnel and reducing assembly efficiency. In addition, the asymmetrical design of the oil channels results in a lack of versatility for the motor end caps, preventing rapid switchover on the production line and further impacting production efficiency.

[0040] Based on this, embodiments of this application provide an oil-cooled motor end cover, a motor, and a vehicle. By optimizing the oil passage layout on the oil-cooled motor end cover, the end covers of the two motors can be interchanged in a vehicle with a dual-motor drive system, thereby reducing costs, simplifying assembly, and improving assembly efficiency.

[0041] The embodiments of this application will be described in detail below with reference to the accompanying drawings and specific implementation details.

[0042] Please combine Figures 1 to 4 , Figure 1 This is a three-dimensional structural diagram of the oil-cooled motor end cover provided in an embodiment of this application. Figure 2 This is a schematic diagram of the planar structure of the oil-cooled motor end cover provided in an embodiment of this application. Figure 3 This is a three-dimensional structural diagram of the oil-cooled motor end cover provided in an embodiment of this application, viewed from another angle. Figure 4 This is a schematic diagram of the planar structure of the oil-cooled motor end cover provided in an embodiment of this application from another perspective.

[0043] like Figures 1 to 4As shown, this embodiment provides an oil-cooled motor end cover 10, including a cover body 1. An oil storage cavity 120 (the designation of the oil storage cavity 120 will be shown in the following figures) is provided inside the cover body 1. At least two oil passages 2 are provided around the oil storage cavity 120. The inlet of the oil passage 2 is connected to an oil inlet pipe 50, and the outlet of the oil passage 2 is connected to the oil storage cavity 120. The at least two oil passages 2 are symmetrically arranged with respect to the first central plane of the oil storage cavity 120. It should be noted that the oil storage cavity 120 can be formed solely by the cover body 1, or it can be formed by enclosing other structural components. The formation of the oil storage cavity 120 is not limited here.

[0044] It should be noted that the first center plane is a certain center plane of the oil storage cavity 120. When the two motors 100 are symmetrically arranged around the mounting axis, the first center plane needs to pass through the mounting axis. The mounting axis is the axis around which the motor 100 is installed. In a specific embodiment of this application, the motor 100 is arranged around the central axis of the bridge housing after installation. Therefore, in a specific embodiment of this application, the mounting axis is the central axis of the bridge housing.

[0045] In other words, the oil-cooled motor end cover 10 provided in this embodiment adopts a symmetrical layout of two oil passages 2. Thus, when the oil-cooled motor end cover 10 provided in this embodiment is applied to a vehicle with a dual-motor drive system, the oil-cooled motor end covers 10 for both motors 100 can use the same mold and tooling fixture (the reference numerals of the motors 100 will be shown in the following figures). Compared with the related art where two oil-cooled motor end covers require the development of separate dedicated molds, the structural design of the oil-cooled motor end cover 10 provided in this embodiment can reduce the manufacturing cost of the dual-motor drive system.

[0046] Meanwhile, the symmetrical design of the two oil passages 2 eliminates the need to distinguish between the two oil-cooled motor end caps 10 when assembling the dual-motor drive system. This improves the assembly efficiency of the dual-motor drive system and the vehicle, and also reduces the risk of human error during assembly.

[0047] Furthermore, the oil-cooled motor end caps 10 of the two motors 100 can be completely interchanged, eliminating the need to distinguish the installation direction. For example, both motors 100 are symmetrically inclined relative to the vertical plane and spaced apart around the installation axis, and both require oil supply from above. The oil inlet pipes 50 (the numbers of the oil inlet pipes 50 will be shown in the following figures) are both at the top. If the oil-cooled motor end caps 10 of the two motors 100 are asymmetrical, two sets of molds would need to be developed. However, when manufacturing a dual-motor drive system using the oil-cooled motor end caps 10 provided in this embodiment, only one set of molds needs to be developed.

[0048] Furthermore, the cover body 1 includes a first main body portion 11 and a second main body portion 12 connected together. The second main body portion 12 has a mounting hole 121 and a first central axis L1 extending axially therein. The first center plane of the oil reservoir 120 passes through the first central axis L1. Each oil passage 2 has a second central axis L2 extending radially along the second main body portion 12, and the second central axes L2 of at least two oil passages 2 intersect at a symmetrical point O. The symmetrical point O is located on the first central axis L1. It should be noted that the first central axis L1 is the assembly reference line of the rotating shaft 20 of the motor 100 (the reference numeral for the rotating shaft 20 will be shown in the following figures).

[0049] It should be noted that, in some embodiments, to improve the structural strength of the oil-cooled motor end cover 10, the oil-cooled motor end cover 10 provided in this embodiment is manufactured using an integral molding process. This effectively resists the vibration stress of the motor 100 during operation compared to a spliced ​​structure. The integral molding process used here could be die casting or similar methods. Therefore, no specific limitation is made on the integral molding process used for the oil-cooled motor end cover 10.

[0050] Furthermore, the cover body 1 also includes an outer edge portion 13 and at least two oil passage portions 14. The outer edge portion 13 is connected to the periphery of the cover body 1. At least two oil passages 2 are formed within the oil passage portions 14. One end of the oil passage portion 14 is connected to the second main body portion 12, and the other end of the oil passage portion 14 extends to the outer edge portion 13 and connects with it. It is understood that the structural strength is relatively low at the location where the oil passage 2 is formed. Therefore, in order to avoid the impact of the oil passage 2 on the structural strength of the oil-cooled motor end cover 10 to a certain extent, in some embodiments, the oil passage portion 14 protrudes from the end face of the second main body portion 12 in the axial direction; and the oil passage portion 14 protrudes from the outer peripheral surface of the second main body portion 12 in the radial direction. In this way, the size of the oil passage portion 14 at the location where the oil passage 2 is formed is larger than the thickness of the second main body portion 12 itself. That is, the wall thickness of the oil passage 2 can meet the requirements to ensure strength, thereby improving the structural strength of the oil-cooled motor end cover 10 provided in this embodiment.

[0051] Please continue to combine Figures 5 to 7 , Figure 5 This is a schematic diagram of the planar structure of the motor provided in an embodiment of this application. Figure 6 for Figure 5 Cross-sectional view along the AA direction. Figure 7 for Figure 6A magnified view of the partial structure at point B. Specifically, the oil passage 14 may include a first oil passage segment 141 and a second oil passage segment 142 connected together. The first oil passage segment 141 is connected to the outer edge 13 and extends axially along the second main body 12. The second oil passage segment 142 is connected to the second main body 12 and extends radially along the second main body 12. The oil passage 2 includes a first oil passage segment 21 and a second oil passage segment 22 connected together. The first oil passage segment 21 is formed on the first oil passage segment 141, and the extension direction of the first oil passage segment 21 is consistent with the extension direction of the first oil passage segment 141, that is, the first oil passage segment 21 extends axially along the second main body 12. The second oil passage segment 22 is formed on the second oil passage segment 142, and the extension direction of the second oil passage segment 22 is consistent with the extension direction of the second oil passage segment 142, that is, the second oil passage segment 22 extends radially along the second main body 12. Thus, this segmented oil passage design 2 can not only ensure the rationality of the oil passage direction, but also facilitate the molding of the mold for making the oil-cooled motor end cover 10.

[0052] It is understandable that the cooling oil may contain impurities, which could cause blockage of the oil passage 2. To facilitate cleaning of the oil passage 2, in some optional embodiments, the oil passage 14 has an opening 221 at the end radially away from the second main body 12. The opening 221 connects to the oil passage 2, and is coaxially arranged with the outlet of the oil passage 2. The axis of the opening 221 is perpendicular to the axis of the inlet of the oil passage 2. A detachable plug 3 is provided at the opening 221. For example, the plug 3 can be threaded to the second oil passage section 22, so that when blockage occurs in the oil passage 2, the plug 3 can be removed for cleaning.

[0053] It should be noted that, in order to improve the sealing performance within the oil passage 2, the aforementioned sealing head 3 can be made of an elastic material such as silicone rubber. This ensures that it can be easily disassembled and cleaned later, while also maintaining a tight seal and preventing external impurities from entering the oil passage 2 to a certain extent.

[0054] It is understandable that in the motor 100, there will be some low-voltage plugs 30, such as DC-DC converters (direct current to direct current converters) for converting DC voltage located on the outside of the first main body 11. The low-voltage plugs 30 will be connected to wire harnesses (not shown in the figure), and at least part of these wire harnesses will be housed in the first main body 11. During the use of the motor 100, the wire harnesses may experience problems such as short circuits. In order to facilitate the maintenance of the wire harnesses, an inspection port 111 and a plug-in mounting port 112 for installing the low-voltage plugs 30 can be provided on the first main body 11. By providing the inspection port 111, the wire harnesses can be maintained through the inspection port 111.

[0055] During normal use of the motor 100, in order to ensure the sealing of the inspection port 111, a detachable inspection cover 40 can be installed at the inspection port 111. In this way, when a problem occurs with the wiring harness, the inspection cover 40 can be removed from the inspection port 111 to inspect the wiring harness inside the first main body 11.

[0056] Please combine Figure 1 and Figure 2 In this embodiment, the inspection port 111 has a third central axis L3 extending radially along the second main body 12, and the third central axis L3 intersects with the first central axis L1; wherein, the first center surface of the oil reservoir 120 passes through the third central axis L3. This facilitates the determination of the position of the inspection port 111 and the position of the two oil passages 2. This improves the processing efficiency of the oil-cooled motor end cover 10 provided in this embodiment.

[0057] It should be noted that, in actual production, the angle between the second central axis L2 and the third central axis L3 is determined based on the actual dimensions of the motor 100 and the corresponding position of the oil inlet pipe 50. In some specific embodiments, the angle between the second central axis L2 and the third central axis L3 can be 62.5 degrees. Here, no limitation is placed on the angle between the second central axis L2 and the third central axis L3.

[0058] Please combine Figure 3 and Figure 4Furthermore, a plurality of wire harness fixing parts 15 may be provided on the inner side of the second main body 12, and the wire harness fixing parts 15 are provided with first fixing holes 151 for fixing the wire harness. In this way, the wire harness connecting the resolver stator 80 (the reference numeral for the resolver stator 80 is shown in the following figures) and the low-voltage plug-in 30 can be fixed. On the one hand, this can improve the convenience of internal wiring of the motor 100. On the other hand, it can prevent the wire harness from being suspended or shaking, which could interfere with other structures or cause safety problems such as insulation issues, thereby improving the operational stability of the motor 100 provided in this embodiment.

[0059] It should be noted that the axial direction of the first fixing hole 151 can be aligned with the axial direction of the second main body 12. Here, no specific limitation is made on the axial direction of the first fixing hole 151.

[0060] In a specific embodiment of this invention, the aforementioned wire harness fixing part 15 can be arranged in two at circumferential intervals along the mounting part 122. Of course, in other embodiments, the wire harness fixing part 15 can also be arranged in three, four, or other ways. It should be noted that the number of wire harness fixing parts 15 is determined based on the actual wiring inside the motor 100, and is not specifically limited here.

[0061] Furthermore, to avoid insufficient strength at the wiring harness fixing point of the oil-cooled motor end cover 10 provided in this embodiment, multiple first reinforcing ribs 16 are arranged circumferentially at intervals on the inner side of the second main body 12. At least two of the multiple first reinforcing ribs 16 are correspondingly arranged with at least two oil passage sections 14, and the first reinforcing ribs 16 are connected to the middle of the corresponding oil passage section 14. Specifically, one end of the first reinforcing rib 16 is connected to the mounting part 122, and the other end of the first reinforcing rib 16 is connected to the middle of the first oil passage section 141. In this way, when the first reinforcing rib 16 is rigidly connected to the middle of the first oil passage section 141, a triangular support system with the first oil passage section 141 as the fulcrum is formed, which can improve the bending stiffness of the oil passage section 14. Moreover, this design can effectively suppress the periodic deformation of the oil passage section 14 caused by oil pressure pulsation by converting the radial force generated by the motor 100 during operation into the axial stress of the first reinforcing rib 16.

[0062] In addition, a second reinforcing rib 17 is provided on the inner side of the cover body 1. The second reinforcing rib 17 is located between the second main body portion 12 and the first main body portion 11, and a second fixing hole 171 for fixing the wire harness is provided on the second reinforcing rib 17. Specifically, the two ends of the second reinforcing rib 17 are respectively connected to the outer edge portion 13; wherein, the width of the second reinforcing rib 17 at the location where the second fixing hole 171 is opened is greater than the width at other locations.

[0063] In other words, the second reinforcing rib 17 is widened in the area of ​​the second fixing hole 171, forming an umbrella-shaped stress diffusion structure centered on the second fixing hole 171. This allows the concentrated load generated by the clips or fixing bolts that secure the wire harness to be evenly distributed through the widened area, reducing stress concentration around the second fixing hole 171 and, to some extent, suppressing the formation of fatigue cracks.

[0064] It should be noted that the connection between the aforementioned wire harness and the first fixing hole 151, as well as between the wire harness and the second fixing hole 171, can be secured by clips or bolts. No specific restrictions are imposed here.

[0065] This embodiment also provides a motor 100, including a housing 60, the aforementioned oil-cooled motor end cover 10, and at least one oil inlet pipe 50; the oil-cooled motor end cover 10 and at least one oil inlet pipe 50 are both installed in the housing 60, and the inlet of at least one oil passage 2 is connected to the oil inlet pipe 50. In this way, the cooling oil transported in the oil inlet pipe 50 can flow into the oil passage 2.

[0066] The diameter of oil passage 2 corresponds to the outer diameter of oil inlet pipe 50, which can be understood as being equal. In this way, the local pressure loss caused by the sudden change in the cross-sectional area of ​​the oil passage is eliminated by the equal-diameter connection, which can improve the uniformity of the cooling oil flow rate, avoid turbulence caused by changes in pipe diameter, ensure the formation of a stable oil film layer on the surface of the rotating shaft 20, and improve the cooling effect on the rotating shaft 20.

[0067] Please continue to combine Figures 6 to 8 ,in, Figure 8 for Figure 2 A cross-sectional view along the CC direction. Furthermore, in order for the motor 100 to operate normally, the motor 100 provided in this embodiment also includes a bearing 70, a resolver stator 80, an oil guide 90, and a bearing pressure plate 110. Part of the structure of the oil guide 90 extends into the shaft hole 201 of the rotating shaft 20.

[0068] Specifically, a mounting portion 122 is formed in the middle of the second main body 12, and a mounting hole 121 is formed on the mounting portion 122. The mounting portion 122 has an inner end face 1221 and an outer end face 1222 that are arranged opposite to each other along the axial direction of the second main body 12. Since the mounting hole 121 needs to be formed on the mounting portion 122, the dimension of the mounting portion 122 along the axial direction of the second main body 12 should be larger than the dimension of its peripheral structure along the axial direction of the second main body 12. In this way, the strength of the oil-cooled motor end cover 10 can be guaranteed.

[0069] In order to install the aforementioned bearing 70, resolver stator 80, and oil guide 90, in some specific embodiments, the mounting hole 121 includes a first hole section 1211, a second hole section 1212, and a third hole section 1213 connected in sequence. The bearing 70 is installed in the first hole section 1211. The wire harness fixing part 15 and multiple first reinforcing ribs 16 are located on the periphery of the first hole section 1211. The multiple first reinforcing ribs 16 are arranged at intervals along the circumference of the first hole section. The resolver stator 80 is installed in the second hole section 1212, and the oil guide 90 is installed in the third hole section 1213. The bearing pressure plate 110 presses against the end of the bearing 70 away from the oil guide 90, and the oil guide 90 presses against the resolver stator 80.

[0070] In some specific embodiments, the diameter of the first hole segment 1211 is greater than or equal to 72 mm and less than or equal to 72.019 mm, and the axial length of the first hole segment 1211 is greater than or equal to 16.6 mm and less than or equal to 16.7 mm; the diameter of the second hole segment 1212 is greater than or equal to 101 mm and less than or equal to 101.05 mm, and the axial length of the second hole segment 1212 is greater than or equal to 3.4 mm and less than or equal to 3.6 mm; the diameter of the third hole segment 1213 is greater than or equal to 133 mm and less than or equal to 133.15 mm, and the axial length of the third hole segment 1213 is 25 mm. It should be noted that in other embodiments, the size of the mounting hole 121 can be determined based on the actual size of the motor 100; therefore, no specific limitation is placed on the size of the mounting hole 121 here.

[0071] Since the outer periphery of the resolver stator 80 also has an outwardly extending boss structure, in order to adapt the shape of the second hole segment 1212 to the contour shape of the resolver stator 80, the installation efficiency of the resolver stator 80 can be improved. In some embodiments, the second hole segment 1212 may include a communicating first sub-hole 1214 and a second sub-hole 1215. The first sub-hole 1214 is located closer to the first hole segment 1211 than the second sub-hole 1215, and the diameter of the first sub-hole 1214 is smaller than the diameter of the second sub-hole 1215. In this way, the second hole segment 1212 can adapt to the contour shape of the resolver stator 80, and at the same time, it can limit the resolver stator 80 in the axial direction of the second main body 12, thereby improving the assembly efficiency between the resolver stator 80 and the oil-cooled motor end cover 10.

[0072] Similarly, in order to improve the assembly efficiency between the bearing 70 and the oil-cooled motor end cover 10, an annular boss 123 can be formed on the inner wall of the mounting hole 121. The annular boss 123 separates the first hole segment 1211 from the first sub-hole 1214. Moreover, during the installation process, the bearing 70 and the resolver stator 80 abut against the two ends of the annular boss 123 respectively to limit the bearing 70 and the resolver stator 80, thereby improving the assembly efficiency of the motor 100 provided in this embodiment.

[0073] To improve the connection reliability between the bearing 70 and the oil-cooled motor end cover 10, the position of the end of the bearing 70 furthest from the annular boss 123 needs to be limited. This can be achieved using the aforementioned bearing pressure plate 110. To ensure effective contact between the bearing pressure plate 110 and the bearing 70, in some optional embodiments, the end of the bearing 70 furthest from the oil guide 90 protrudes from the first hole segment 1211, with a protrusion length greater than or equal to 0.18 mm and less than or equal to 0.4 mm. In other words, the distance between the end of the bearing pressure plate 110 facing the inner end face 1221 and the inner end face 1221 is greater than or equal to 0.18 mm and less than or equal to 0.4 mm. This ensures effective contact between the bearing pressure plate 110 and the bearing 70, achieving effective positioning of the bearing 70. Furthermore, it helps to prevent deformation of the bearing pressure plate 110 due to excessive protrusion length.

[0074] In a specific implementation of this embodiment, the protrusion length is 0.4 mm. In this way, while taking into account the positioning and deformation considerations, the structural compactness of the motor 100 provided in this embodiment along the axis of the rotating shaft 20 can be improved, thereby reducing the space occupied by the motor 100 provided in this embodiment.

[0075] Similarly, one end of the oil guide 90 on the face of the resolver stator 80 protrudes from the second hole section 1212, and the protrusion length is greater than or equal to 0.2 mm and less than or equal to 0.8 mm. In this way, on the one hand, the resolver stator 80 can be limited to a certain extent to prevent the resolver stator 80 from shaking within the second hole section 1212; on the other hand, it can prevent the oil guide 90 from deforming due to excessive protrusion length.

[0076] In a specific implementation of this embodiment, the protrusion length is 0.8 mm. This further improves the structural compactness of the motor 100 provided in this embodiment along the axis of the rotating shaft 20, thereby further reducing the space occupied by the motor 100 provided in this embodiment.

[0077] In order to form an oil storage cavity 120 that communicates with the second oil passage section 22, the aforementioned mounting hole 121 also needs to include a fourth hole section 1216 that communicates with the third hole section 1213. The diameter of the fourth hole section 1216 is larger than the diameter of the third hole section 1213. In this way, a stop surface 1217 can be formed at the connection between the third hole section 1213 and the fourth hole section 1216. The oil cavity cover 130 abuts against the stop surface 1217, thereby sealing the side of the oil storage cavity 120 away from the housing 60. An oil guide 90 is provided on the side of the oil storage cavity 120 close to the housing 60. The oil storage cavity 120, the oil cavity cover 130, and the oil guide 90 together form an oil storage space.

[0078] Specifically, the oil-cooled motor end cover 10 is provided with an oil storage chamber 120. The side of the oil storage chamber 120 away from the housing 60 is closed by an oil chamber cover 130, and the other side of the oil storage chamber 120 is provided with an oil guide 90. The oil storage chamber 120 is connected to an oil source. Cooling oil passes through the oil-cooled motor end cover 10 into the oil storage chamber 120 (or oil storage space), and then enters the shaft 20 through the oil guide 90 to cool the resolver stator 80 and resolver rotor 150. The oil-cooled motor end cover 10 is a relatively closed structure, and the shaft 20 can rotate within the oil-cooled motor end cover 10 to ensure that the oil-cooled motor 100 can operate normally.

[0079] Furthermore, the oil guide 90 is disposed inside the oil-cooled motor end cover 10. The oil guide 90 is disposed on the side of the resolver stator 80 facing the cover body 1. The oil guide 90 extends into the rotating shaft 20 to connect the oil storage chamber 120 (or oil storage space) and the rotating shaft 20. The resolver stator 80 is attached to the inner side of the cover body 1. The oil guide 90 is disposed in the oil storage cavity 120. The oil guide 90 is located on the side of the resolver stator 80 facing the cover body 1. The oil guide 90 abuts against the resolver stator 80. Part of the oil guide 90 extends into the inside of the rotating shaft 20, thereby connecting the oil storage cavity 120 (or oil storage space) and the rotating shaft 20. This allows cooling oil to enter the rotating shaft 20 from the oil guide 90, and then enter the gap between the resolver stator 80 and the resolver rotor 150, carrying away the heat of the resolver stator 80 and the resolver rotor 150, thus achieving cooling of the resolver stator 80 and the resolver rotor 150.

[0080] It should be noted that, in this embodiment, both the bearing pressure plate 110 and the oil chamber cover 130 can be detachably connected to the second main body 12 via screws or other threaded fasteners. No specific restrictions are placed on the connection method between the bearing pressure plate 110 and the second main body 12, or between the oil chamber cover 130 and the second main body 12.

[0081] like Figure 7 As shown, in order to secure the oil guide 90 and the resolver stator 80, in some optional embodiments, the motor 100 further includes a fastener 140. The fastener 140 is sequentially inserted through the oil guide 90, the resolver stator 80, and the second main body 12 to connect the oil guide 90 and the resolver stator 80 to the oil-cooled motor end cover 10. In this way, on the one hand, the oil guide 90 and the resolver stator 80 can be secured; on the other hand, a single fastener 140 can simultaneously secure both the oil guide 90 and the resolver stator 80, which not only improves installation efficiency but also reduces assembly costs.

[0082] Furthermore, such as Figure 7As shown, the motor 100 provided in this embodiment also includes a resolver rotor 150 and two washers 160. The shaft 20 has a first shaft section 202 with a uniform diameter. The bearing 70, resolver rotor 150, and two washers 160 are all fitted onto the first shaft section 202. The resolver rotor 150 is located inside the resolver stator 80. The resolver stator 80 has a fourth center line L4 extending radially along the second main body 12. The resolver rotor 150 has a fifth center line L5 extending radially along the second main body 12. The two washers 160 abut against the opposite ends of the resolver rotor 150 so that the fourth center line L4 coincides with the fifth center line L5.

[0083] Thus, a washer 160 can separate the bearing 70 from the resolver rotor 150, achieving functional decoupling between the mechanical system and the sensing system through physical separation. Specifically, the bearing 70, as a rotating support component, needs to withstand dynamic loads, while the resolver rotor 150, as a precision sensor, needs to acquire stable magnetic field signals. Separating the two effectively prevents the transmission of vibration energy generated by the bearing 70 during operation, and also avoids thermal shock to the resolver rotor 150 caused by the temperature rise of the bearing 70 to a certain extent. Therefore, the service life of the motor 100 provided in this embodiment can be extended.

[0084] Furthermore, when the fourth center line L4 coincides with the fifth center line L5, the voltage waveform induced in the windings of the resolver stator 80 by the magnetic field generated by the permanent magnet of the resolver rotor 150 will exhibit ideal sinusoidal characteristics, thereby eliminating high-order harmonics caused by uneven air gap to a certain extent. In addition, the uniform air gap distribution reduces magnetic pull fluctuations during rotation, and together with the isolation layout of the bearing 70 and the resolver rotor 150, it can improve the signal-to-noise ratio of the resolver signal and enhance the performance of the motor 100 provided in this embodiment.

[0085] Of course, the motor 100 provided in this embodiment should also include an armature 170, which is mounted on the housing 60. Please refer to... Figure 3 and Figure 4 Each of the first reinforcing ribs 16 has a notch 161 formed to avoid interference with the armature 170. In this way, the arrangement of the first reinforcing ribs 16 can avoid interference with other modules.

[0086] Please continue to combine Figure 9 , Figure 9This is a schematic diagram of a partial structure of a vehicle provided in an embodiment of this application. As shown in the figure, this embodiment also provides a vehicle including at least two motors 100 as described in the above embodiments, and the at least two motors 100 are connected together by the axle housing of the axle 200, and the at least two motors 100 are arranged at intervals around the central axis of the axle housing; wherein, the first center plane of the oil reservoir 120 passes through the central axis of the axle housing. In this way, the structural symmetry and compactness after the motors 100 are connected to the axle housing can be improved. The structure of the motor 100 has been described in detail in the above embodiments, and will not be repeated here.

[0087] Specifically, the two motors 100 are symmetrically arranged around the central axis of the axle housing of the axle 200. That is, the two motors 100 are mirror images of each other with the vertical plane passing through the central axis of the axle housing as the plane of symmetry. The central axis of the axle housing is located on the first central surface of the oil reservoir 120 of the oil-cooled motor end cover 10 of the two motors 100, thus forming a geometric symmetry. This symmetrical layout not only optimizes the torque distribution of the drive system through spatial balance, but also, because the first central surface of the oil reservoir 120 passes through the central axis of the axle housing, allows the lubrication paths of the two motors 100 to share the central oil passage within the axle housing, achieving bidirectional balanced oil supply and synchronous lubrication, thereby improving the transmission efficiency and system reliability of the drive system.

[0088] Furthermore, when the two motors 100 are symmetrically arranged around the central axis of the axle housing of the axle 200, it means that the oil-cooled motor end caps 10 of the two motors 100 are also symmetrically arranged around the central axis of the axle housing of the axle 200. In this case, it means that the structures of the two oil-cooled motor end caps 10 are the same, that is, the oil-cooled motor end caps 10 of the two motors 100 can be interchanged. In this way, the manufacturing cost of the two motors 100 can be reduced, thereby reducing the manufacturing cost of the vehicle provided in this embodiment.

[0089] The arrangement of at least two motors 100 can be along the front-to-back direction of the vehicle or along the width direction of the vehicle. No specific limitation is made here regarding the arrangement of the at least two motors 100.

[0090] It should be noted that the vehicle provided in this embodiment should also include other modules or components that enable the vehicle to operate normally. Here, no restrictions are placed on other modules or components.

[0091] When the vehicle provided in this embodiment adopts a dual-motor layout, by using the same mold to produce the two oil-cooled motor end caps 10, it is possible to ensure that the corresponding oil inlet pipes 50 of the two oil-cooled motor end caps 10 are on the same horizontal line, thereby reducing the production cost and efficiency of the vehicle.

[0092] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An oil-cooled electric machine end shield, characterized by, The cover body is provided with an oil storage cavity, and at least two oil channels are arranged around the oil storage cavity.

2. The oil-cooled motor end cover according to claim 1, wherein the cover body comprises a first body part and a second body part connected together, the second body part has a mounting hole, and the second body part has a first central axis extending in the axial direction thereof, and the first central axis passes through the first central plane of the oil storage cavity. The oil channels have second central axes extending in the radial direction of the second body part, and the second central axes of the at least two oil channels intersect at a symmetric point. The symmetric point is located on the first central axis.

3. The oil-cooled motor end cover according to claim 2, wherein the cover body further comprises an outer edge part and at least two oil passing parts, the outer edge part is formed on the circumferential side of the cover body, at least part of the oil channels are formed in the oil passing parts, one end of the oil passing part is connected to the second body part, and the other end of the oil passing part extends to the outer edge part and is connected to the outer edge part. In the axial direction of the second body part, the oil passing part protrudes from the end surface of the second body part, and in the radial direction of the second body part, the oil passing part protrudes from the outer circumferential surface of the second body part. An opening is formed in the oil passing part away from the end of the second body part in the radial direction of the second body part, the opening communicates with the oil channel, and the opening is coaxially arranged with the outlet of the oil channel, and the axis of the opening is arranged perpendicularly to the axis of the inlet of the oil channel. A detachable plug is arranged at the opening. An inspection hole and a plug-in mounting hole for mounting a low-voltage plug-in are formed in the first body part.

4. The oil-cooled motor end shield of claim 3, wherein, The inspection hole has a third central axis extending in the radial direction of the second body part, and the third central axis intersects the first central axis. The first central plane of the oil storage cavity passes through the third central axis.

5. The oil-cooled electric machine end shield of claim 3 or 4, wherein, A plurality of wire harness fixing parts are arranged on the inner side of the second body part, and a first fixing hole for fixing a wire harness is formed in the wire harness fixing part. The inner side of the second body part is provided with a plurality of first reinforcing ribs arranged in a circumferential direction, at least two of the first reinforcing ribs correspond to the at least two oil passing parts, and the first reinforcing rib is connected to the middle part of the corresponding oil passing part. A second reinforcing rib is arranged between the second body part and the first body part, and a second fixing hole for fixing a wire harness is formed in the second reinforcing rib. The oil-cooled motor end cover and the at least one oil inlet pipe are mounted in the shell, the inlet of the at least two oil channels communicates with the oil inlet pipe, and the diameter of the oil channel corresponds to the outer diameter of the oil inlet pipe. ​ ​ 6. An electric machine characterized by ​ ​ ​ 7. The electric machine of claim 6, wherein, The motor further comprises a bearing, a resolver stator, an oil guide and a bearing pressing plate; the second body part of the cover body has a mounting hole comprising a first hole section, a second hole section and a third hole section communicated in sequence, the bearing is mounted in the first hole section, the resolver stator is mounted in the second hole section, and the oil guide is mounted in the third hole section; The bearing pressing plate abuts against one end of the bearing away from the oil guide, and the oil guide abuts against the resolver stator; The one end of the bearing away from the oil guide protrudes out of the first hole section by a length greater than or equal to 0.18 mm and less than or equal to 0.4 mm; and / or The one end of the resolver stator facing the oil guide protrudes out of the second hole section by a length greater than or equal to 0.2 mm and less than or equal to 0.8 mm.

8. The electric machine of claim 7, wherein, The motor further comprises a low-voltage plug-in and a wire harness, the low-voltage plug-in is arranged in a plug-in mounting port of the cover body, and the wire harness is electrically connected with the resolver stator and the low-voltage plug-in; The inner side of the second body part is provided with a wire harness fixing part, the wire harness fixing part is located at the periphery of the first hole section, a first fixing hole is formed in the wire harness fixing part, the inner side of the cover body is further provided with a second reinforcing rib, a second fixing hole is formed in the second reinforcing rib, and the wire harness is fixedly connected to the first fixing hole and the second fixing hole of the oil-cooled motor end cover; and / or The motor further comprises a fastener, the fastener is sequentially arranged in the oil guide, the resolver stator and the second body part, so as to connect the oil guide and the resolver stator with the oil-cooled motor end cover together; and / or The motor further comprises a rotating shaft, a resolver rotor and two gaskets, the rotating shaft has a shaft hole, part of the structure of the oil guide extends into the shaft hole, the rotating shaft has a first shaft section, the diameter of the first shaft section is equal at all positions, the bearing, the resolver rotor and the two gaskets are sleeved on the first shaft section, and the resolver rotor is located inside the resolver stator; The resolver stator has a fourth center line extending along the radial direction of the second body part, the resolver rotor has a fifth center line extending along the radial direction of the second body part, and the two gaskets are respectively arranged at opposite ends of the resolver rotor, so that the fourth center line coincides with the fifth center line.

9. The motor of claim 7, wherein The motor further comprises an armature, and the armature is mounted in the shell; The inner side of the second body part is provided with a plurality of first reinforcing ribs, the plurality of first reinforcing ribs are located at the periphery of the first hole section and are arranged in a spaced manner along the circumferential direction of the first hole section, and a notch is formed in each first reinforcing rib to avoid the armature.

10. A vehicle characterized by comprising: The axle further comprises an axle housing and at least two motors according to any one of claims 6 to 9, the at least two motors are connected together through the axle housing, and the at least two motors are arranged in a spaced manner around the central axis of the axle housing; The first central surface of the oil storage cavity passes through the central axis of the axle housing.

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