An electric drive end cover, an electric drive shell, an electric drive system and a vehicle

Abstract

The application provides an electric drive end cover, an electric drive shell, an electric drive system and a vehicle, and relates to the technical field of electric driving. The electric drive end cover comprises a shell and a cover plate. The shell is provided with a suspension mounting portion and a window. The outer surface of the shell is provided with a plurality of first reinforcing ribs and a plurality of second reinforcing ribs. Each first reinforcing rib is arranged in a radial direction and surrounds the suspension mounting portion as a center. Each second reinforcing rib extends radially and outwardly as a radiation center of the suspension mounting portion. Each second reinforcing rib is connected with the first reinforcing rib. The cover plate is used for covering the window. The outer surface of the cover plate is provided with a plurality of third reinforcing ribs and a plurality of fourth reinforcing ribs. Each third reinforcing rib is arranged in a radial direction and surrounds the middle part of the cover plate as a center. Each fourth reinforcing rib extends radially and outwardly as a radiation center of the middle part of the cover plate. Each fourth reinforcing rib is connected with the third reinforcing rib. The structure of the electric drive end cover is optimized, and the NVH performance of the gearbox and the whole vehicle can be improved to a certain extent.

Description

Technical Field

[0001] This utility model relates to the field of electric drive technology, and in particular to an electric drive end cover, an electric drive housing, an electric drive system, and a vehicle. Background Technology

[0002] The electric drive end cover is one of the core structural components of an electric drive system, typically consisting of a rear housing and a rear cover. The rear housing connects to the main motor housing, serving as the connection point for the vehicle's mounting system, while the rear cover interfaces with the inverter housing, reinforcing the inverter system. The electric drive end cover primarily integrates and bears multiple mechanical and vibrational loads from the mounting system, motor, and inverter. It is a fundamental structure ensuring the stable installation of the electric drive assembly on the vehicle body, achieving efficient power transmission, and effectively controlling vibration and noise.

[0003] In recent years, with the continuous development of electric drive systems towards higher power density and the increasing demands of consumers for vehicle ride comfort, coupled with increasingly stringent vehicle operating conditions, especially under extreme transient conditions such as rapid acceleration and deceleration, the resulting high-intensity impacts place more stringent requirements on the stiffness of the suspension system and the overall modal characteristics of the assembly. Against this backdrop, how to effectively guide and control the vibration energy transmission path through structural reinforcement design, thereby systematically improving the NVH (Noise, Vibration, Harshness) performance of the transmission and the entire vehicle, has become a crucial technical challenge for the industry. Utility Model Content

[0004] This application aims to at least partially solve the technical problem of unsatisfactory NVH performance of the transmission and the whole vehicle. To this end, this application proposes an electric drive end cover, an electric drive housing, an electric drive system, and a vehicle.

[0005] A first aspect of this application provides an electric drive end cover, including a housing and a cover plate. The housing has a suspension mounting portion and a window. The outer surface of the housing has multiple first reinforcing ribs and multiple second reinforcing ribs. Each first reinforcing rib is arranged radially at intervals around the suspension mounting portion as the center. Each second reinforcing rib extends radially outward with the suspension mounting portion as the radiation center. Each second reinforcing rib is connected to a first reinforcing rib. The cover plate is used to cover the window. The outer surface of the cover plate has multiple third reinforcing ribs and multiple fourth reinforcing ribs. Each third reinforcing rib is arranged radially at intervals around the middle of the cover plate as the center. Each fourth reinforcing rib extends radially outward with the middle of the cover plate as the radiation center. Each fourth reinforcing rib is connected to a third reinforcing rib.

[0006] The electric drive end cover provided in this application embodiment, by providing a first concentric reinforcing rib and a radial second reinforcing rib centered on the suspension mounting portion on the outer surface of the housing, and a third concentric reinforcing rib and a radial fourth reinforcing rib centered on the middle portion on the outer surface of the cover plate, can quickly and evenly distribute the load applied to the suspension mounting portion to the entire electric drive end cover and even the transmission housing, thereby effectively alleviating the phenomenon of local stress concentration and significantly enhancing structural strength and fatigue life performance; at the same time, the annular reinforcing rib frame structure can promote coordinated overall deformation of the suspension structure, which can not only improve the overall modal frequency of the electric drive end cover. This can also enhance the dynamic stiffness of the suspension mounting part, thereby helping to optimize the NVH characteristics of the component; while the central area of ​​the cover plate has a rigidity weakness due to the thin plate structure, the ring-shaped stirrup frame structure can not only strengthen the rigidity and modal of the cover plate itself, but also enable the cover plate to better cooperate with the shell to bear the vibration and load from the inverter side, and suppress the generation and propagation of vibration noise; in addition, the reinforcing rib layout of this ring-shaped stirrup frame structure can appropriately reduce the thickness of a single reinforcing rib while ensuring mechanical performance, and achieve a uniform distribution of the shell and cover plate wall thickness, which can improve the overall casting quality of the electric drive end cover and provide the possibility of achieving lightweight design.

[0007] In some embodiments, the suspension mounting portion is a boss structure, wherein one end of the second reinforcing rib is connected to the boss structure.

[0008] In some embodiments, at least the first reinforcing rib closest to the suspension mounting portion is a continuous arc segment surrounding the suspension mounting portion, and at least the third reinforcing rib closest to the center of the cover plate is a continuous arc segment surrounding the center of the cover plate.

[0009] In some embodiments, a fifth reinforcing rib is provided between some of the first reinforcing ribs, and the fifth reinforcing rib extends radially outward with the suspension mounting portion as the radiation center.

[0010] In some embodiments, the housing is provided with a motor bearing hole, the suspension mounting portion is radially offset from the motor bearing hole, and the inner surface of the housing is provided with a reinforcing structure at a position corresponding to the suspension mounting portion. The reinforcing structure includes multiple sixth reinforcing ribs and multiple seventh reinforcing ribs. Each of the sixth reinforcing ribs is arranged radially at intervals with the center of the motor bearing hole as the center, and each of the seventh reinforcing ribs extends radially outward with the center of the motor bearing hole as the radiation center, and is connected to the sixth reinforcing rib.

[0011] In some embodiments, an eighth reinforcing rib is provided between some of the third reinforcing ribs, and the eighth reinforcing rib extends radially outward with the center of the cover plate as the radiation center.

[0012] A second aspect of this application provides an electric drive housing, including a motor housing assembly and an electric drive end cover of any of the aforementioned structures. The motor housing assembly is provided with a mounting window, and the electric drive end cover is used to cover the mounting window.

[0013] A third aspect of the embodiments of this application provides an electric drive system, including an electric drive housing of any of the aforementioned structures, and a drive motor disposed in the electric drive housing.

[0014] A fourth aspect of this application provides a vehicle that uses an electric drive system with any of the aforementioned structures.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and some of these additional aspects and advantages will become apparent from the description or may be learned by practice of the invention. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the assembly state of the shell and cover plate in one embodiment of the present utility model; Figure 2 This is a first-view structural schematic diagram of the housing in one embodiment of the present invention; Figure 3 This is a second-view structural schematic diagram of the shell in one embodiment of the present invention; Figure 4 This is a schematic diagram of the cover plate in one embodiment of the present utility model; Explanation of key component symbols: Housing 100, suspension mounting part 110, window 120, first reinforcing rib 130, second reinforcing rib 140, fifth reinforcing rib 150, motor bearing hole 160, sixth reinforcing rib 170, and seventh reinforcing rib 180; Cover plate 200, third reinforcing rib 210, fourth reinforcing rib 220, eighth reinforcing rib 240; The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0017] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0018] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0020] In the description of this utility model, unless otherwise explicitly defined, terms such as arrangement, installation, and connection should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0021] As electric drive systems continue to develop towards higher power density, and consumers' demands for vehicle ride comfort continue to increase, and as the operating conditions of the whole vehicle become increasingly severe, especially under extreme transient conditions such as rapid acceleration and deceleration, the high-intensity impacts they generate place more stringent requirements on the stiffness of the suspension system and the overall mode of the assembly.

[0022] To better address these development requirements, embodiments of this application provide an electric drive end cover, an electric drive housing 100, an electric drive system, and a vehicle. By reinforcing the structure of the electric drive end cover, the transmission path of vibration energy can be effectively guided and controlled, thereby improving the NVH performance of the transmission and the entire vehicle to a certain extent.

[0023] This application is described below with reference to the accompanying drawings and specific embodiments: See Figures 1 to 4 In some embodiments, the electric drive end cover includes a housing 100 and a cover plate 200. The housing 100 has a mounting portion 110 and a window 120. The mounting portion 110 on the housing 100 matches the vehicle's mounting points. During assembly, the cover plate 200 closes the window 120 to seal the housing 100. Simultaneously, an inverter mounting portion (not shown in the drawings) is arranged on the cover plate 200 to enhance the structural strength of the inverter housing.

[0024] To enhance the structural strength of the shell 100 and reduce surface vibration and radiated noise, multiple first reinforcing ribs 130 and multiple second reinforcing ribs 140 are provided on the outer surface of the shell 100. Each first reinforcing rib 130 is arranged radially around the suspension mounting part 110 as the center, and each second reinforcing rib 140 extends radially outward from the suspension mounting part 110 as the radiation center. Each second reinforcing rib 140 is connected to the first reinforcing rib 130, thereby forming a ring-shaped stirrup frame structure.

[0025] To enhance the structural strength of the cover plate 200 and reduce its surface vibration and radiated noise, multiple third reinforcing ribs 210 and multiple fourth reinforcing ribs 220 are provided on the outer surface of the cover plate 200. Each third reinforcing rib 210 is arranged radially around the center of the cover plate 200, and each fourth reinforcing rib 220 extends radially outward from the center of the cover plate 200. Each fourth reinforcing rib 220 is connected to a third reinforcing rib 210, thereby forming a ring-shaped stirrup frame structure.

[0026] It should be noted that, since the cover plate 200 is a thin plate structure, its central part is often the weakest point in terms of structural strength. To confirm the specific location, a topology optimization analysis of the cover plate 200 can be performed.

[0027] The electric drive end cover provided in the embodiments of this application allows the load applied to the suspension mounting part to be quickly and evenly diffused to the entire electric drive end cover and even the transmission housing through the aforementioned annular stirrup frame structure, thereby effectively alleviating the phenomenon of local stress concentration and significantly enhancing structural strength and fatigue life performance.

[0028] At the same time, the ring-shaped stirrup frame structure can promote coordinated overall deformation of the suspension structure, which not only improves the overall modal frequency of the electric drive end cover, but also enhances the dynamic stiffness of the suspension mounting part, thereby helping to optimize the NVH characteristics of the component.

[0029] As for the cover plate, the central area has a rigidity weakness due to its thin plate structure. By arranging reinforcing ribs radiating from the central area and interconnected in a circumferential manner on the outer surface of the cover plate, a highly efficient ring-shaped stirrup frame structure is formed. This structure not only strengthens the rigidity and modality of the cover plate itself, but also enables it to better cooperate with the shell to withstand vibrations and loads from the inverter side, suppressing the generation and propagation of vibration noise.

[0030] In addition, the reinforcing rib layout of this type of ring-shaped stirrup frame structure can appropriately reduce the thickness of a single reinforcing rib while ensuring mechanical performance, thereby achieving a uniform distribution of the shell and cover plate wall thickness. This can improve the overall casting quality of the electric drive end cover and provide the possibility for lightweight design.

[0031] See Figure 2In some embodiments, the suspension mounting portion 110 is a boss structure, wherein one end of the second reinforcing rib 140 is connected to the boss structure.

[0032] The electric drive end cap provided in the embodiments of this application has a boss structure itself as a local reinforcement, which can improve the pressure bearing capacity and deformation resistance of the suspension mounting part. The second reinforcing rib, which is radially arranged around the boss structure and directly connected to it, can efficiently guide and disperse the concentrated load acting on the boss structure into the annular stirrup frame structure composed of the first reinforcing rib and the second reinforcing rib, thereby improving the force transmission efficiency.

[0033] In addition, the combination of the boss structure and the reinforcing ribs of the ring frame structure not only specifically strengthens the local dynamic stiffness of the mounting area, but also suppresses the micro-displacement and plastic deformation that may occur at the mounting point under extreme working conditions, ensuring the stability of the connection between the electric drive assembly and the vehicle body, thereby reducing the risk of vibration and abnormal noise caused by insufficient stiffness at the connection point.

[0034] See Figure 2 In some embodiments, at least the first reinforcing rib 130 closest to the suspension mounting portion 110 is a continuous arc segment surrounding the suspension mounting portion 110, and at least the third reinforcing rib 210 closest to the middle of the cover plate 200 is a continuous arc segment surrounding the middle of the cover plate 200.

[0035] For example, the first reinforcing rib 130 closest to the suspension mounting portion 110 is configured as a closed circular reinforcing rib structure, and the two third reinforcing ribs 210 closest to the middle of the cover plate 200 are also configured as closed circular reinforcing rib structures.

[0036] The electric drive end cover provided in the embodiments of this application features a closed annular reinforcing rib that forms a reinforcing rib structure with extremely high in-plane stiffness around the suspension point and the center of the cover plate. Compared with discrete or interrupted reinforcing ribs, this can eliminate potential end stress concentration points and guide the stress to redistribute smoothly and continuously within its loop, avoiding local peak stresses and improving the fatigue strength and durability of the structure under long-term alternating loads. Furthermore, this continuous annular structure greatly strengthens the two key response sources: the suspension mounting point and the center of the cover plate. For the suspension mounting part, this means higher dynamic stiffness, which can reduce the amplitude under impact excitations such as rapid acceleration and deceleration. For the center of the cover plate, it can raise its natural frequency, preventing coupling with the main order excitation of the motor or gear meshing, thus weakening the generation and transmission of vibration energy at its source.

[0037] See Figure 2 In some embodiments, a fifth reinforcing rib 150 is provided between some of the first reinforcing ribs 130, and the fifth reinforcing rib 150 extends radially outward with the suspension mounting part 110 as the radiation center.

[0038] The electric drive end cover provided in the embodiments of this application introduces an additional fifth reinforcing rib into the annular hoop frame structure formed by the original first and second reinforcing ribs, dividing the shell surface into more and smaller load-bearing units, thereby improving the overall structural rigidity and more effectively suppressing the micro-deformation of the large-area shell.

[0039] Secondly, by selectively adding radial stiffeners between some adjacent first stiffeners, it is possible to specifically reinforce areas with weak local modes that may exist in the original shell structure, thereby more precisely controlling the vibration mode of the overall structure and helping to suppress the radiated noise of the shell.

[0040] In addition, the first, second, and fifth reinforcing ribs form a denser rib network, which allows the impact load from the suspension point to be redistributed and absorbed over a larger area, thus minimizing local stress peaks. At the same time, this also promotes a more homogeneous material distribution in the shell on a macroscopic scale, which not only improves the structural efficiency of the parts but also creates favorable conditions for obtaining more stable molding quality during the casting process.

[0041] See Figure 3 In some embodiments, the housing 100 is provided with a motor bearing hole 160, and the suspension mounting part 110 is radially offset from the motor bearing hole 160.

[0042] Since the area around the motor bearing hole needs to accommodate key components such as bearings and resolvers, the structure is complex and the space is compact. If the suspension mounting part and the motor bearing hole are arranged concentrically, the reinforcement structures required by the two are very likely to interfere with each other, resulting in uneven local wall thickness, increased hot spots, and affecting casting quality. However, by designing the two in a staggered manner, sufficient space can be left for the independent reinforcement areas required by each of them.

[0043] Furthermore, when the electric drive assembly is running, the mounting bracket mainly bears the reaction torque from the vehicle body, while the output shaft of the electric drive assembly's motor is a rotational torque. By offsetting the mounting bracket, a clear lever arm is created to resist the motor's reaction torque. The load originates from this offset fulcrum and can be more effectively diverted and dissipated through the pre-set reinforcing frame, rather than being entirely compressed around the shaft hole. This reduces the mutual interference between the two different types of loads and improves the force transmission efficiency.

[0044] In addition, see Figure 3The inner surface of the housing 100 is provided with a reinforcing structure at the position corresponding to the suspension mounting portion 110. The reinforcing structure includes multiple sixth reinforcing ribs 170 and multiple seventh reinforcing ribs 180. Specifically, each sixth reinforcing rib 170 is arranged radially at intervals around the center of the motor bearing hole 160, and each seventh reinforcing rib 180 extends radially outward with the center of the motor bearing hole 160 as the radiation center. Each seventh reinforcing rib 180 is connected to the sixth reinforcing rib 170.

[0045] The electric drive end cover provided in the embodiments of this application provides targeted reinforcement in the back area of ​​the suspension mounting position by setting a sixth and a seventh reinforcing rib centered on the motor bearing hole on the inner wall of the housing. This can improve the local dynamic stiffness at the suspension mounting position, effectively suppress bending and torsional deformation, and thus ensure that the area where the stress is most concentrated can still maintain structural integrity and geometric stability under extreme transient impact.

[0046] See Figure 4 In some embodiments, an eighth reinforcing rib 240 is provided between some of the third reinforcing ribs 210, and the eighth reinforcing rib 240 extends radially outward with the center of the cover plate 200 as the radiation center.

[0047] The electric drive end cover provided in the embodiments of this application improves the overall structural rigidity of the cover plate 200 by specifically reinforcing the front area of ​​the cover plate 200, and can effectively suppress the deformation of the large-area thin plate structure.

[0048] This application also provides an electric drive housing, including a motor housing assembly and an electric drive end cover of any of the aforementioned structures. The motor housing assembly is provided with an installation window, and during assembly, the electric drive end cover closes the installation window to form a relatively sealed receiving cavity.

[0049] The electric drive housing provided in the embodiments of this application, based on the electric drive end cover of any of the aforementioned structures, can not only improve the overall structural rigidity and modal characteristics of the electric drive housing, but also avoid structural resonance and noise amplification problems caused by insufficient local rigidity to a certain extent. This enables the electric drive assembly to meet the requirements of high power density electric drive systems for lightweight, high reliability and excellent comfort with better NVH performance and stronger structural strength.

[0050] This application also provides an electric drive system, including an electric drive housing of any of the aforementioned structures, and a drive motor disposed in the electric drive housing.

[0051] The electric drive system provided in this application embodiment can meet the requirements of high power density electric drive systems for lightweight, high reliability and excellent comfort based on the above-mentioned electric drive housing.

[0052] This application also provides a vehicle that uses an electric drive system with any of the aforementioned structures.

[0053] The vehicle provided in this application embodiment can create a quieter and more comfortable driving environment for the passenger compartment based on the above-mentioned electric drive system. At the same time, under high-intensity impact conditions, the suspension mounting area can still maintain extremely high local dynamic stiffness and overall structural stability, effectively reducing the impact and residual vibration during rapid acceleration and deceleration, and improving the driving and riding quality.

[0054] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. An electric drive end cap, characterized in that, include: The housing has a suspension mounting part and a window. The outer surface of the housing has multiple first reinforcing ribs and multiple second reinforcing ribs. Each first reinforcing rib is arranged radially at intervals around the suspension mounting part as the center. Each second reinforcing rib extends radially outward around the suspension mounting part as the radiation center, and is connected to the first reinforcing rib. A cover plate is used to cover the window. The outer surface of the cover plate is provided with multiple third reinforcing ribs and multiple fourth reinforcing ribs. Each of the third reinforcing ribs is arranged radially around the center of the cover plate, and each of the fourth reinforcing ribs extends radially outward from the center of the cover plate, and is connected to the third reinforcing ribs.

2. The electric drive end cover according to claim 1, characterized in that, The suspension mounting part is a boss structure, wherein one end of the second reinforcing rib is connected to the boss structure.

3. The electric drive end cover according to claim 2, characterized in that, At least the first reinforcing rib closest to the suspension mounting portion is a continuous arc segment surrounding the suspension mounting portion, and at least the third reinforcing rib closest to the center of the cover plate is a continuous arc segment surrounding the center of the cover plate.

4. The electric drive end cover according to claim 1, characterized in that, A fifth reinforcing rib is also provided between some of the first reinforcing ribs, and the fifth reinforcing rib extends radially outward with the suspension mounting part as the radiation center.

5. The electric drive end cover according to claim 2, characterized in that, The housing is provided with a motor bearing hole. The suspension mounting part is radially offset from the motor bearing hole. The inner surface of the housing is provided with a reinforcing structure at the position corresponding to the suspension mounting part. The reinforcing structure includes multiple sixth reinforcing ribs and multiple seventh reinforcing ribs. Each of the sixth reinforcing ribs is arranged radially at intervals with the center of the motor bearing hole as the center. Each of the seventh reinforcing ribs extends radially outward with the center of the motor bearing hole as the radiation center, and all of them are connected to the sixth reinforcing ribs.

6. The electric drive end cover according to claim 1, characterized in that, An eighth reinforcing rib is also provided between the third reinforcing ribs, and the eighth reinforcing rib extends radially outward with the center of the cover plate as the radiation center.

7. An electric drive housing, characterized in that, The device includes a motor housing assembly and an electric drive end cover as described in any one of claims 1 to 6, wherein the motor housing assembly has a mounting window and the electric drive end cover is used to cover the mounting window.

8. An electric drive system, characterized in that, It includes the electric drive housing as described in claim 7, and a drive motor disposed in the electric drive housing.

9. A vehicle, characterized in that, The electric drive system as described in claim 8 is used.

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