The motor housing assembly, the motor, the powertrain, and the vehicle

Abstract

This disclosure relates to a motor housing assembly, a motor, a powertrain, and a vehicle. The motor housing assembly includes a housing body and a bearing sleeve. The housing body includes a wall structure forming a mounting groove. The wall structure has a weakening portion for weakening the rigidity of the wall structure. The bearing sleeve is at least partially nested in the mounting groove and fixedly connected to the wall structure. The bearing sleeve is used to fit onto a bearing on the motor shaft. By providing the weakening portion on the wall structure, the rigidity of the wall structure can be weakened, and the impact of thermal deformation of the housing body on the bearing sleeve can be reduced. Thus, when the temperature changes, the change in interference fit between the bearing sleeve and the bearing can be further reduced, and the change in bearing clearance can be further reduced, further reducing the impact of thermal deformation of the housing body on the bearing clearance, and reducing vibration and noise during motor operation.

Description

Technical Field

[0001] This disclosure relates to the field of electrical equipment technology, specifically to an electric motor housing assembly, an electric motor, a powertrain, and a vehicle. Background Technology

[0002] The motor housing and bearings have different coefficients of thermal expansion. Thermal deformation of the motor housing (such as thermal expansion or contraction) affects the bearings, causing significant changes in bearing clearance with temperature, which in turn leads to greater vibration during motor operation. Therefore, related technologies use a bearing sleeve between the motor housing and the bearing to mitigate the impact of the motor housing's thermal deformation on the bearing. However, thermal deformation of the motor housing can exert pressure or tension on the bearing sleeve, resulting in significant changes in the interference fit between the bearing sleeve and the bearing, and consequently, significant changes in the bearing clearance. Utility Model Content

[0003] The purpose of this disclosure is to provide a housing assembly for an electric motor, an electric motor, a powertrain, and a vehicle. This housing assembly can reduce the impact of thermal deformation of the motor housing on bearing clearance, thereby reducing the amount of change in bearing clearance with temperature, and thus reducing vibration and noise generated by the motor during operation.

[0004] To achieve the above objectives, a first aspect of this disclosure provides a housing assembly for an electric motor, comprising: The shell body includes a wall structure forming a mounting groove, wherein the wall structure is provided with a weakening portion for weakening the rigidity of the wall structure; and, The bearing sleeve is at least partially nested in the mounting groove and fixedly connected to the wall structure. The bearing sleeve is used to fit onto the bearing on the motor shaft. This arrangement can reduce the impact of thermal deformation of the housing body on the bearing clearance, so that the change in bearing clearance with temperature is smaller, thereby reducing the vibration and noise generated by the motor during operation.

[0005] Optionally, the weakening part includes a stress-relieving groove disposed in the wall structure. Thus, the weakening part is implemented in the form of a stress-relieving groove, which facilitates processing.

[0006] Optionally, the stress relief groove extends along the axial direction of the motor. This configuration allows for the formation of a continuous weakening zone along the depth direction of the mounting groove on the wall structure, thereby more effectively reducing the rigidity of the wall structure.

[0007] Optionally, the stress relief groove is configured to extend from the opening of the mounting groove toward the bottom of the mounting groove, which facilitates the processing of the stress relief groove.

[0008] Optionally, along the axial direction of the motor, the depth of the stress-relieving groove is less than the depth of the mounting groove, such that the wall structure includes an annular portion located between the bottom of the stress-relieving groove and the bottom of the mounting groove, the annular portion fitting against the outer peripheral wall of the bearing sleeve. This arrangement, on the one hand, maintains the cleanliness between the bearing sleeve and the bottom of the mounting groove; on the other hand, it preserves some of the load-bearing rigidity of the wall structure, preventing the bearing sleeve from easily detaching from the mounting groove.

[0009] Optionally, the wall structure includes a circumferentially closed annular portion that fits against the outer peripheral wall of the bearing sleeve. This arrangement can prevent foreign objects such as debris from entering between the bearing sleeve and the bottom of the mounting groove, maintaining the cleanliness between the bearing sleeve and the bottom of the mounting groove. On the other hand, it can retain some of the load-bearing rigidity of the wall structure, avoiding the phenomenon that the bearing sleeve is easily detached from the mounting groove.

[0010] Optionally, the number of the stress relief grooves is at least one; In the radial direction of the motor, at least one of the stress-relieving grooves penetrates the wall structure, thereby weakening the rigidity of the wall structure; and / or, In the radial direction of the motor, at least one of the stress-relieving grooves is located on the inner wall surface of the wall structure facing the bearing sleeve and does not penetrate the outer wall surface of the wall structure opposite to the inner wall surface, thereby weakening the rigidity of the wall structure; and / or, In the radial direction of the motor, at least one of the stress relief grooves is located on the outer wall surface of the wall structure away from the bearing sleeve and does not penetrate the inner wall surface of the wall structure facing the bearing sleeve, thereby weakening the rigidity of the wall structure.

[0011] Optionally, the number of stress relief grooves may be one or more, and the multiple stress relief grooves may be arranged at intervals along the circumference of the wall structure. This arrangement can more effectively weaken the stiffness of the wall structure.

[0012] Optionally, the number of stress relief grooves is multiple and arranged in pairs. The two stress relief grooves arranged in pairs are positioned opposite each other in the radial direction of the motor, which can make the stress relief grooves evenly distributed in the circumferential direction of the wall structure and reduce the impact of asymmetrical deformation of the wall structure on the bearing sleeve.

[0013] Optionally, the bearing sleeve and the wall structure are connected by casting, which makes the connection between the bearing sleeve and the wall structure more stable, prevents the steel sleeve from fretting wear or axial displacement under vibration environment, and reduces the risk of mechanical failure caused by loosening.

[0014] A second aspect of this disclosure provides an electric motor comprising a bearing, a shaft, and a housing assembly as provided in the first aspect of this disclosure, wherein the bearing is disposed on the shaft and a bearing sleeve is fitted onto the bearing. This electric motor possesses all the advantages of the aforementioned housing assembly, which will not be elaborated further herein.

[0015] Optionally, the bearing sleeve includes a steel bushing, and / or, The bearings include steel bearings, and / or, The wall structure includes an aluminum alloy structure.

[0016] Thus, the thermal expansion coefficients of the bearing sleeve and the bearing are the same or similar, and when the temperature changes, the interference fit between the bearing sleeve and the bearing changes little, and the bearing clearance changes little.

[0017] A third aspect of this disclosure provides a powertrain that includes a housing assembly as provided in the first aspect of this disclosure, or an electric motor as provided in the second aspect.

[0018] This disclosure provides a vehicle including a powertrain as provided in the third aspect of this disclosure.

[0019] Through the above technical solution, the housing body includes a wall structure forming an installation groove. The wall structure is provided with a weakening part, which is used to weaken the rigidity of the wall structure. The bearing sleeve is at least partially nested in the installation groove and fixedly connected to the wall structure. The bearing sleeve is used to fit onto the bearing on the motor shaft. Through the above arrangement, the weakening part on the wall structure can weaken the rigidity of the wall structure and reduce the impact of thermal deformation of the housing body on the bearing sleeve. In this way, when the temperature changes, the change in the interference fit between the bearing sleeve and the bearing can be further reduced, and the change in the bearing clearance can be further reduced, further reducing the impact of thermal deformation of the housing body on the bearing clearance, and reducing the vibration and noise of the motor during operation.

[0020] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a partial structural diagram of the motor provided in an exemplary embodiment of this disclosure; Figure 2 The exemplary embodiments provided in this disclosure are different from those provided in this disclosure. Figure 1 A partial structural diagram of the motor from a certain perspective; Figure 3 This is provided in the exemplary embodiments of this disclosure. Figure 2 Sectional view of AA; Figure 4 This is a schematic diagram of the structure of the bearing sleeve provided in an exemplary embodiment of this disclosure; Figure 5 This is a schematic diagram of the structure of a portion of the shell body provided in an exemplary embodiment of this disclosure; Figure 6 This is a diagram showing the equivalent interference fit-temperature correspondence under three different bearing mounting and housing body installation methods provided in the exemplary embodiments of this disclosure.

[0022] Explanation of reference numerals in the attached figures 100-Motor; 10-Shaft; 20-Housing assembly; 21-Housing body; 211-Wall structure; 2111-Weakening part; 21111-Relief groove; 2112-Annular part; 212-Mounting groove; 2121-Groove; 22-Bearing sleeve; 30-Bearing. Detailed Implementation

[0023] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0024] In this disclosure, an X-direction is defined for the motor, where the X-direction is the axial direction of the motor. Unless otherwise stated, directional terms such as "inner" and "outer" refer to the inner or outer contour relative to the outline of the component or structure itself. Furthermore, it should be noted that terms such as "first" and "second" are used to distinguish one element from another and do not have sequential or importance implications. Additionally, in the description with reference to the accompanying drawings, the same reference numerals in different drawings denote the same elements.

[0025] like Figures 1 to 5 As shown, the first aspect of this disclosure provides a housing assembly 20 for an electric motor, including a housing body 21 and a bearing sleeve 22. The housing body 21 includes a wall structure 211 forming a mounting groove 212. A weakening portion 2111 is provided on the wall structure 211 to weaken the rigidity of the wall structure 211. The bearing sleeve 22 is at least partially nested in the mounting groove 212 and fixedly connected to the wall structure 211. The bearing sleeve 22 is used to sleeve a bearing 30 on the rotating shaft 10 of the motor 100.

[0026] In the above embodiment, a bearing sleeve 22 is provided between the wall structure 211 and the bearing 30. When the wall structure 211 undergoes thermal deformation (thermal expansion or thermal contraction), the bearing sleeve 22 can provide support for the bearing 30, thereby reducing the impact of the thermal deformation of the housing body 21 on the clearance of the bearing 30 and reducing the vibration of the motor 100 during operation. When the vibration of the motor 100 during operation is reduced, the noise generated by the motor 100 during operation can also be reduced. In the technical solution provided in this disclosure, a weakening part 2111 is provided on the wall structure 211, which can weaken the rigidity of the wall structure 211 and reduce the impact of the thermal deformation of the housing body 21 on the bearing sleeve 22. Thus, when the temperature changes, the change in the interference fit between the bearing sleeve 22 and the bearing 30 can be further reduced, and the change in the bearing clearance can be further reduced, further reducing the impact of the thermal deformation of the housing body 21 on the bearing clearance and reducing the vibration and noise of the motor during operation.

[0027] It should be understood that the shaft 10 of the motor 100 can be the rotor shaft of the rotor of the motor 100. When the bearing clearance of the bearing 30 used to support the rotor shaft changes significantly (for example, the bearing clearance becomes larger or smaller), it will cause the motor 100 to vibrate more violently during operation.

[0028] In addition, it should be noted that the coefficient of thermal expansion of the bearing sleeve 22 is closer to that of the bearing 30 than that of the housing body 21, and the coefficient of thermal expansion of the housing body 21 is greater than that of the bearing sleeve 22 and the bearing 30.

[0029] Furthermore, as mentioned above, the bearing sleeve 22 is at least partially nested in the mounting groove 212, and the bearing sleeve 22 is fixedly connected to the wall structure 211. With this arrangement, when the bearing sleeve 22 and the wall structure 211 undergo thermal deformation, the wall structure 211 will exert a force on the bearing sleeve 22. For example, when the temperature rises and causes the bearing sleeve 22 and the wall structure 211 to undergo thermal deformation, the wall structure 211 will pull the bearing sleeve 22, reducing the interference fit between the bearing sleeve 22 and the bearing 30, thereby increasing the clearance of the bearing 30. Conversely, when the temperature drops and causes the bearing sleeve 22 and the wall structure 211 to undergo thermal deformation, the wall structure 211 will apply pressure to the bearing sleeve 22, increasing the interference fit between the bearing sleeve 22 and the bearing 30, thereby reducing the clearance of the bearing 30.

[0030] To further reduce the impact of thermal deformation of the housing 21 on the bearing 30, the inventors provided a weakening portion 2111 on the wall structure 211. The weakening portion 2111 weakens the rigidity of the wall structure 211. This design reduces the impact of thermal deformation of the housing 21 on the bearing sleeve 22 (for example, when the temperature rises and causes thermal deformation of the bearing sleeve 22 and the wall structure 211, the force exerted by the wall structure 211 on the bearing sleeve 22 decreases; when the temperature decreases and causes thermal deformation of the bearing sleeve 22 and the wall structure 211, the pressure exerted by the wall structure 211 on the bearing sleeve 22 decreases). Thus, during temperature changes, the change in interference fit between the bearing sleeve 22 and the bearing 30 is reduced, resulting in a smaller change in bearing clearance, further reducing the impact of thermal deformation of the housing 21 on the clearance of the bearing 30, and reducing vibration during motor 100 operation. Reduced vibration during motor 100 operation also reduces noise generated by the motor 100.

[0031] To more clearly illustrate how the weakening part 2111 in the wall structure 211 can reduce the impact on the interference fit between the bearing sleeve 22 and the bearing 30, an example is given below. Assuming the temperature changes from a1 to a2 (a2>a1), when the wall structure 211 is not equipped with a weakening part 2111, due to the fixed connection between the wall structure 211 and the bearing sleeve 22, the thermal expansion of the wall structure 211 will pull on the bearing sleeve 22, resulting in the same amount of thermal expansion of the wall structure 211 and the bearing sleeve 22, let's say b1. In this case, the change in the interference fit between the bearing sleeve 22 and the bearing 30 is c1. When the wall structure 211 is equipped with a weakening part 2111, due to the fixed connection between the wall structure 211 and the bearing sleeve 22, the thermal expansion of the wall structure 211 and the bearing sleeve 22 will pull on the bearing sleeve 22, resulting in the same amount of thermal expansion of the wall structure 211 and the bearing sleeve 22, let's say b1. In this case, the change in the interference fit between the bearing sleeve 22 and the bearing 30 is c1. The wall structure 211 is fixedly connected to the bearing 30. When the wall structure 211 expands thermally, it will pull on the bearing sleeve 22, resulting in the same amount of thermal expansion between the wall structure 211 and the bearing sleeve 22, let's assume it's b2. Because the wall structure 211 has a weakening part 2111, its rigidity is reduced, and the force exerted by the wall structure 211 on the bearing sleeve 22 during thermal expansion decreases. At this time, the change in the interference fit between the bearing sleeve 22 and the bearing 30 is c2. Therefore, because the force exerted by the wall structure 211 on the bearing sleeve 22 during thermal expansion decreases, b2... <b1,c2<c1。

[0032] In addition, on the premise that the temperature changes from a1 to a3 (a3 < a1), when the weakening portion 2111 is not provided on the wall structure 211, since the wall structure 211 and the bearing sleeve 22 are fixedly connected, when the wall structure 211 thermally contracts, it will exert a pressure on the bearing sleeve 22, resulting in the same thermal contraction amount of the wall structure 211 and the bearing sleeve 22, assumed to be d1. At this time, the change amount of the interference fit between the bearing sleeve 22 and the bearing 30 is e1; when the weakening portion 2111 is provided on the wall structure 211, since the wall structure 211 and the bearing sleeve 22 are fixedly connected, when the wall structure 211 thermally contracts, it will exert a pressure on the bearing sleeve 22, resulting in the same thermal contraction amount of the wall structure 211 and the bearing sleeve 22, assumed to be d2. Due to the provision of the weakening portion 2111 on the wall structure 211, the stiffness of the wall structure 211 is reduced, and the pressure exerted by the wall structure 211 on the bearing sleeve 22 during thermal contraction is reduced. At this time, the change amount of the interference fit between the bearing sleeve 22 and the bearing 30 is e2. Therefore, since the pressure exerted by the wall structure 211 on the bearing sleeve 22 during thermal contraction is reduced, d2 < d1 and e2 < e1.

[0033] In some embodiments, the weakening portion 2111 can be configured in any suitable form. For example, as Figure 1 , Figure 3 and Figure 5 shown, the weakening portion 2111 includes a pressure relief groove 21111 provided on the wall structure 211. The pressure relief groove 21111 is provided on the wall structure 211, which can weaken the stiffness of the wall structure 211, weaken the influence of the thermal deformation of the shell body 21 on the interference fit between the bearing sleeve 22 and the bearing 30, and further weaken the influence of the thermal deformation of the shell on the bearing clearance. And the weakening portion 2111 is realized in the form of the pressure relief groove 21111, which is convenient for processing.

[0034] In some embodiments, the pressure relief groove 21111 extends along the axial direction of the motor 100, that is, the pressure relief groove 21111 extends along the depth direction of the mounting groove 212, and can form a continuous weakening band along the depth direction of the mounting groove 212 on the wall structure 211, more effectively weakening the rigidity of the wall structure 211.

[0035] In some embodiments, as shown in Figure 1 , Figure 3 and Figure 5 shown, the pressure relief groove 21111 is configured to extend from the notch 2121 of the mounting groove 212 towards the bottom of the mounting groove 212, which is convenient for the processing of the pressure relief groove 21111.

[0036] In some embodiments, the number of the pressure relief grooves 21111 can be at least one, which can more effectively weaken the stiffness of the wall structure 211. In the radial direction of the motor 100, at least one pressure relief groove 21111 penetrates the wall structure 211, which can better weaken the stiffness of the wall structure 211.

[0037] In some embodiments, at least one stress relief groove 21111 is located on the inner wall surface of the wall structure 211 facing the bearing sleeve 22 and does not penetrate the outer wall surface of the wall structure 211 opposite to the inner wall surface, which can weaken the rigidity of the wall structure 211.

[0038] In some embodiments, at least one stress relief groove 21111 is located on the outer wall surface of the wall structure 211 away from the bearing sleeve 22 and does not penetrate the inner wall surface of the wall structure 211 toward the bearing sleeve 22 in the radial direction of the motor 100, which can weaken the rigidity of the wall structure 211.

[0039] In the above embodiments, when the stress relief groove 21111 is constructed as a non-penetrating wall structure 211, it can also be considered as locally reducing the thickness of the wall structure 211, which can weaken the rigidity of the wall structure 211.

[0040] In some other possible implementations, the wall thickness of the wall structure 211 may be reduced in part along the circumference of the wall structure 211 to form a weakened portion 2111, thereby reducing the stiffness of the wall structure 211.

[0041] In some embodiments, the number of stress relief grooves 21111 is one or more, and the multiple stress relief grooves 21111 are arranged at intervals along the circumference of the wall structure 211. This arrangement can more effectively weaken the rigidity of the wall structure 211.

[0042] In some embodiments, the number of stress relief grooves 21111 is multiple and arranged in pairs. The two stress relief grooves 21111 arranged in pairs are arranged opposite each other in the radial direction of the motor 100, which can make the stress relief grooves 21111 evenly distributed in the circumferential direction of the wall structure 211 and reduce the impact of asymmetrical deformation of the wall structure 211 on the bearing sleeve 22.

[0043] like Figure 5 As shown, there are two unloading grooves 21111, which are arranged opposite each other in the radial direction of the motor 100.

[0044] In addition, such as Figure 1 , Figure 3 as well as Figure 5 As shown, in the axial direction of the motor 100, the depth of the stress relief groove 21111 is less than the depth of the mounting groove 212, so that the wall structure 211 includes an annular portion 2112 located between the bottom of the stress relief groove 21111 and the bottom of the mounting groove 212, and the annular portion 2112 fits against the outer peripheral wall of the bearing sleeve 22. On the one hand, this prevents foreign objects such as debris from entering between the bearing sleeve 22 and the bottom of the mounting groove 212, maintaining the cleanliness between the bearing sleeve 22 and the bottom of the mounting groove 212; on the other hand, it retains part of the load-bearing rigidity of the wall structure 211, preventing the bearing sleeve 22 from easily falling off the mounting groove 212.

[0045] In some embodiments, the wall structure 211 includes an annular portion 2112 that is closed circumferentially along the wall structure 211. The annular portion 2112 fits against the outer peripheral wall of the bearing sleeve 22, which can seal the space between the bearing sleeve 22 and the bottom of the mounting groove 212, preventing foreign objects such as debris from entering the space between the bearing sleeve 22 and the bottom of the mounting groove 212. In addition, the annular portion 2112 that is closed circumferentially along the wall structure 211 can preserve the supporting rigidity of this part of the wall structure 211, preventing the bearing sleeve 22 from easily falling off the mounting groove 212.

[0046] In some embodiments, the bearing sleeve 22 and the wall structure 211 can be connected by casting. This achieves a fixed connection between the bearing sleeve 22 and the wall structure 211, making the connection between the bearing sleeve 22 and the wall structure 211 more stable. This prevents the steel sleeve from fretting wear or axial displacement under vibration, reducing the risk of mechanical failure due to loosening. The casting process for the bearing sleeve 22 and the wall structure 211 can employ any existing suitable method, which will not be elaborated upon in this disclosure.

[0047] Furthermore, in another possible embodiment, the bearing sleeve 22 may be bonded to the inner wall surface of the wall structure 211. Alternatively, in other possible embodiments, the bearing sleeve and the wall structure may be connected by, for example, a dovetail joint, but this disclosure is not limited thereto.

[0048] Additionally, it should be noted that the bearing sleeve 22 and the mounting groove 212 are interference fit, which will not be elaborated further here.

[0049] A second aspect of this disclosure provides an electric motor 100, such as Figures 1 to 3 As shown, the motor 100 includes a bearing 30, a shaft 10, and a housing assembly 20 of the motor as provided in the first aspect of this disclosure. The bearing 30 is disposed on the shaft 10, and a bearing sleeve 22 is fitted onto the bearing 30. The motor 100 has all the beneficial effects of the aforementioned housing assembly 20, which will not be described in detail here.

[0050] In the above embodiment, the bearing 30 is used to support the rotating shaft 10 of the motor 100. The rotating shaft 10 of the motor 100 can be the rotating shaft 10 of the rotor of the motor 100. The rotating shaft 10 of the rotor of the motor 100 is inserted into the bearing 30. The bearing 30 is nested in the bearing sleeve 22. The bearing 30 and the bearing sleeve 22 are interference-fitted. The bearing sleeve 22 is nested in the mounting groove 212. The bearing sleeve 22 and the mounting groove 212 are also interference-fitted.

[0051] It should be understood that the two ends of the rotating shaft 10 of the motor 100 are respectively inserted into a bearing 30, and each bearing 30 is nested in a bearing sleeve 22. That is, each bearing 30 is fixedly connected to the housing body 21 through a bearing sleeve 22.

[0052] In some embodiments, bearing sleeve 22 may include a steel bushing, and / or bearing 30 may include a steel bearing, and / or wall structure 211 may include an aluminum alloy structure.

[0053] It should be noted that the housing body 21 of the motor 100 is usually made of aluminum alloy. Therefore, the wall structure 211, as part of the housing body 21, can also be made of aluminum alloy. The bearing 30 is usually a steel bearing. The thermal expansion coefficient of the housing body 21 made of aluminum alloy is greater than that of the steel bearing. The bearing sleeve 22 can be a steel bushing. The thermal expansion coefficient of the housing body 21 made of aluminum alloy is greater than that of the steel bushing. The thermal expansion coefficient of the bearing sleeve 22 is similar to or the same as that of the bearing 30. That is, the thermal expansion coefficient of the bearing sleeve 22 is closer to that of the bearing 30 than that of the housing body 21, or the thermal expansion coefficient of the bearing sleeve 22 is the same as that of the bearing 30. When the temperature changes, the interference dimension between the bearing sleeve 22 and the bearing 30 changes little, and the bearing clearance changes little.

[0054] Furthermore, although the bearing sleeve 22 can reduce the impact of the housing body 21 on the bearing clearance during thermal deformation, the inventors have found that this impact can be further reduced. For example, the inventors have found that the aluminum alloy housing body 21 or the wall structure 211 will pull on the bearing sleeve 22 when it expands thermally, so that the change in interference between the bearing sleeve 22 and the bearing 30 is still relatively large. However, this disclosure reduces the pulling of the wall structure 211 on the bearing sleeve 22 by weakening the rigidity of the wall structure 211 through the weakening part 2111. As a result, the change in interference between the bearing sleeve 22 and the bearing 30 can be reduced, and thus the change in bearing clearance can be reduced.

[0055] Similarly, when the aluminum alloy shell body 21 or wall structure 211 undergoes thermal shrinkage, it will exert pressure on the bearing sleeve 22, so that the interference fit between the bearing sleeve 22 and the bearing 30 still changes significantly. However, this disclosure weakens the stiffness of the wall structure 211 by weakening the part 2111, which can reduce the pressure exerted by the wall structure 211 on the bearing sleeve 22. As a result, the interference fit between the bearing sleeve 22 and the bearing 30 can be reduced, and the change in bearing clearance can be reduced. In other words, by providing the weakening part 2111 on the wall structure 211, the change in interference fit between the bearing sleeve 22 and the bearing 30 can be further reduced, the vibration generated during the operation of the motor 100 can be reduced, and the stability can be increased.

[0056] In some embodiments, both the bearing sleeve 22 and the bearing 30 are made of bearing steel, and the bearing sleeve 22 and the bearing 30 have the same coefficient of thermal expansion. The housing body 21 is made of aluminum alloy, such as... Figure 6 The diagram illustrates the equivalent interference fit-temperature relationship for three different mounting configurations of the bearing 30 to the housing 21. The equivalent interference fit is in millimeters, and the temperature is in degrees Celsius. In the first configuration, the bearing 30 is directly mounted in the mounting groove 212, and no stress relief groove 21111 is provided on the wall structure 211. In the second configuration, the bearing 30 is mounted in the mounting groove 212 via the bearing sleeve 22, and no stress relief groove 21111 is provided on the wall structure 211. In the third configuration, the bearing 30 is mounted in the mounting groove 212 via the bearing sleeve 22, and a stress relief groove 21111 is provided on the wall structure 211. Specifically, when the bearing 30 is directly mounted in the mounting groove 212, the equivalent interference fit is the interference fit between the bearing 30 and the wall structure 211. When the bearing 30 is mounted in the mounting groove 212 via the bearing sleeve 22, the interference fit between the bearing 30 and the bearing sleeve 22 is the equivalent interference fit.

[0057] Among them, such as Figure 6 As shown in the figure, curve B refers to the curve where the bearing 30 is directly installed in the mounting groove 212 and no stress relief groove 21111 is provided on the wall structure 211; curve C refers to the curve where the bearing 30 is installed in the mounting groove 212 through the bearing sleeve 22 and no stress relief groove 21111 is provided on the wall structure 211; curve D refers to the curve where the bearing 30 is installed in the mounting groove 212 through the bearing sleeve 22 and a stress relief groove 21111 is provided on the wall structure 211. It can be seen from the figure that when the temperature changes, the equivalent interference of curve D changes more slowly. That is, in the scheme where the bearing 30 is installed in the mounting groove 212 through the bearing sleeve 22 and a stress relief groove 21111 is provided on the wall structure 211, the equivalent interference is less affected by temperature changes. This results in a smaller change in the clearance of the bearing 30, reducing vibration during motor 100 operation (especially when the motor 100 is running at high speed), increasing the stability of motor 100 operation, and reducing noise during motor operation. Therefore, the arrangement of mounting the bearing 30 in the mounting groove 212 via the bearing sleeve 22 and opening the stress relief groove 21111 on the wall structure 211 can ensure that the change value of the equivalent interference is within an acceptable range within the operating temperature range.

[0058] A third aspect of this disclosure provides a powertrain that includes a housing assembly as provided in the first aspect of this disclosure, or an electric motor 100 as provided in the second aspect of this disclosure.

[0059] This disclosure provides a vehicle, including the powertrain provided in this third aspect of the disclosure. The vehicle may include electric vehicles, hybrid vehicles, etc., and is not limited thereto.

[0060] The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0061] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0062] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A housing assembly for an electric machine, characterized by, include: The shell body includes a wall structure forming an installation groove, and the wall structure is provided with a weakening part, which is used to weaken the rigidity of the wall structure. and, A bearing sleeve, at least partially nested within the mounting groove and fixedly connected to the wall structure, is used to fit onto the bearing on the motor shaft.

2. The housing assembly of an electric machine of claim 1, wherein, The weakening part includes a stress-relief groove disposed in the wall structure.

3. The housing assembly of an electric machine of claim 2, wherein, The stress relief groove extends along the axial direction of the motor.

4. The housing assembly of claim 2, wherein, The stress relief groove is constructed such that it extends from the opening of the mounting groove toward the bottom of the mounting groove.

5. The housing assembly of an electric machine of claim 4, wherein, Along the axial direction of the motor, the depth of the stress relief groove is less than the depth of the mounting groove, such that the wall structure includes an annular portion located between the bottom of the stress relief groove and the bottom of the mounting groove, the annular portion fitting against the outer peripheral wall of the bearing sleeve.

6. The housing assembly of the electric machine of claim 2, wherein, The wall structure includes a circumferentially closed annular portion that fits against the outer peripheral wall of the bearing sleeve.

7. The housing assembly of an electric machine of claim 2, wherein, The number of the pressure relief grooves is at least one; In the radial direction of the motor, at least one of the stress-relieving grooves penetrates the wall structure; and / or, In the radial direction of the motor, at least one of the stress relief grooves is located on the inner wall surface of the wall structure facing the bearing sleeve and does not penetrate the outer wall surface of the wall structure opposite to the inner wall surface; And / or, In the radial direction of the motor, at least one of the stress relief grooves is located on the outer wall surface of the wall structure away from the bearing sleeve and does not penetrate the inner wall surface of the wall structure facing the bearing sleeve.

8. The housing assembly of an electric machine of claim 2, wherein, The number of stress relief grooves is one or more, and the plurality of stress relief grooves are arranged at intervals along the circumference of the wall structure.

9. The housing assembly of an electric machine of claim 2, wherein, The number of stress relief grooves is multiple and they are arranged in pairs, with the two stress relief grooves arranged in pairs facing each other in the radial direction of the motor.

10. The housing assembly of an electric machine of claim 1, wherein, The bearing sleeve is connected to the wall structure by casting.

11. An electric machine characterized by The motor includes a bearing, a shaft, and a housing assembly as described in any one of claims 1-10, wherein the bearing is disposed on the shaft and the bearing sleeve is fitted onto the bearing.

12. The electric machine of claim 11, wherein, The bearing sleeve includes a steel bushing, and / or, The bearings include steel bearings, and / or, The wall structure includes an aluminum alloy structure.

13. A powertrain, characterized by, It includes the housing assembly as described in any one of claims 1-10, or the motor as described in claim 11 or 12.

14. A vehicle characterized by comprising: Including the powertrain as described in claim 13.

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