Anti-corrosion structure for electrical device housing and electric drive assembly

Abstract

The present application relates to the technical field of anti-corrosion. Provided are an anti-corrosion structure for an electrical device housing and an electric drive assembly. The electrical device housing comprises a first housing and a second housing, wherein the first housing and the second housing are made of different metal materials. The anti-corrosion structure comprises a flow guide member, wherein the flow guide member is arranged on the electrical device housing. The flow guide member can guide salt spray liquid to flow to other positions, so as to prevent the salt spray liquid from accumulating at the bottom connection area between the first housing and the second housing, thereby mitigating the corrosion of the electrical device housing. Thus, the anti-corrosion structure of the present application can improve the corrosion resistance of the electrical device housing.

Description

Corrosion-resistant structure of electrical equipment housing and electric drive assembly

[0001] This application claims priority to Chinese Patent Application No. 202422655059.6, filed on October 31, 2024, entitled "Anti-corrosion structure for electrical equipment housing and electric drive assembly", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of corrosion protection technology, and more specifically, to a corrosion-resistant structure for an electrical equipment housing and an electric drive assembly. Background Technology

[0003] An electric drive assembly refers to the collection of electrified components used to drive the wheels in an electric vehicle (EV) or hybrid electric vehicle (HEV), typically consisting of a motor, reducer, controller, etc. The electric drive assembly housing refers to the outer shell used to house these components, generally composed of a unibody housing and end caps, with the end caps and unibody housing made of different metals.

[0004] In actual use, when the electric drive assembly is in a salt spray environment, due to the different materials used for the end cap and the integrated housing, the salt spray liquefies and accumulates at the bottom of the joint surface between the two, making the bottom of the joint surface easily corroded and reducing the reliability of the product.

[0005] Utility Model Content

[0006] The purpose of this application is to provide an anti-corrosion structure for electrical equipment housings and an electric drive assembly, which solves the problem of easy corrosion of the bottom mating surface of electrical equipment housings in related technologies.

[0007] In a first aspect, this application provides an anti-corrosion structure for an electrical equipment housing, the electrical equipment housing comprising a first housing and a second housing connected together, the first housing and the second housing being made of metal and made of different materials, and having a bottom connection along the direction of gravity, the anti-corrosion structure comprising:

[0008] A flow guide is disposed on the electrical equipment housing, the flow guide being configured to block liquid from flowing from the surface of the electrical equipment housing to the bottom connection.

[0009] In some embodiments, there are multiple flow guides, including a first flow guide disposed at the bottom of the electrical equipment housing along the direction of gravity, and the height of the first flow guide is lower than the height of the bottom connection.

[0010] In some embodiments, the first guide member is continuously disposed along the extension direction of the bottom connection.

[0011] In some embodiments, the plurality of flow guides further include a second flow guide;

[0012] The second guide has a first end and a second end, the first end being connected to the electrical equipment housing, and the first end being offset from the bottom connection point;

[0013] Along the direction of gravity, the height of the second end is lower than the height of the first end.

[0014] In some embodiments, the direction from the first housing to the second housing is a first direction, and the direction from the second guide to the electrical equipment housing is a second direction, wherein the first direction and the second direction intersect.

[0015] In some embodiments, a portion of the second flow guide is connected to the first housing, and another portion of the second flow guide is connected to the second housing.

[0016] In some embodiments, there are multiple second flow guides, which are spaced apart from each other in the electrical equipment housing.

[0017] In some embodiments, the first housing is made of magnesium alloy.

[0018] In some embodiments, the first housing and / or the second housing are provided with recessed threaded connection holes, the first housing and the second housing are connected by bolts, and the outer periphery of the bolts is provided with insulating adhesive.

[0019] In some embodiments, the bolt is made of magnesium alloy, or the surface of the bolt is coated with a magnesium alloy coating.

[0020] In some embodiments, the electrical equipment housing is an electric drive assembly housing, which includes an integrated housing and an end cover connected to the integrated housing; wherein the end cover is the first housing and the integrated housing is the second housing.

[0021] Secondly, based on the corrosion-resistant structure of the electrical equipment housing described above, this application also provides an electric drive assembly, including the corrosion-resistant structure of the electrical equipment housing described above.

[0022] In the anti-corrosion structure for electrical equipment housing provided in this application, a flow guide is disposed within the electrical equipment housing. This flow guide directs the salt spray liquid to other locations, preventing its accumulation at the bottom connection between the first and second housings, thereby mitigating corrosion of the electrical equipment housing. Therefore, the anti-corrosion structure of this application can improve the corrosion resistance of the electrical equipment housing. Attached Figure Description

[0023] Figure 1 is a schematic diagram of the external structure of the electric drive assembly in one embodiment of this application;

[0024] Figure 2 is a magnified view of part A in Figure 1;

[0025] Figure 3 is a schematic diagram of the structure of the first housing in one embodiment of this application;

[0026] Figure 4 is a front view of the electric drive assembly in one embodiment of this application.

[0027] Explanation of reference numerals in the attached drawings: 100 - Corrosion-resistant structure of the electric drive assembly housing; 11 - First guide element; 12 - Second guide element; 121 - First end; 122 - Second end; 200 - First housing; 300 - Second housing; 400 - Bottom connection. Detailed Implementation

[0028] The embodiments of this application 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 application, and should not be construed as limiting this application.

[0029] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0030] The electric drive assembly housing typically consists of a reducer housing and an integrated housing. The reducer housing is made of magnesium alloy, while the integrated housing is made of aluminum alloy or other materials. The reducer housing and the integrated housing are fastened together with bolts. In actual use, when the electric drive assembly is exposed to salt spray, the different materials used in the reducer housing and the integrated housing make their mating surfaces susceptible to corrosion, especially at the bottom of the mating surface. This is because the liquid generated by the liquefaction of the salt spray accumulates at the bottom of the mating surface, leading to severe corrosion at this location.

[0031] Therefore, methods to prevent salt spray liquid from accumulating at the bottom of the mating surface can be used to mitigate corrosion. Based on the above considerations, this invention proposes to install a guide component, which allows the salt spray liquid to fall directly without accumulating at the bottom of the mating surface, thereby reducing corrosion.

[0032] According to some embodiments of this utility model, referring to FIG1, this utility model proposes an anti-corrosion structure 100 for an electrical equipment housing. The electrical equipment housing includes a first housing 200 and a second housing 300, which are made of different metal materials. The first housing 200 and the second housing 300 are mated to form the electrical equipment housing. Specifically, the electrical equipment housing 100 has a bottom connection 400. The first housing 200 is made of magnesium alloy. The anti-corrosion structure 100 includes a flow guide, which is disposed in the electrical equipment housing. The flow guide can block liquid on the surface of the electrical equipment housing from flowing to the bottom connection 400, thereby preventing salt spray liquid from accumulating at the bottom connection 400.

[0033] The number of flow guides is multiple, and the multiple flow guides may include a first flow guide 11 and a second flow guide 12. The first flow guide 11 is disposed at the bottom of the first housing 200 when it is in use, and is used to prevent salt spray liquid on the surface of the first housing 200 from accumulating at the joint surface of the first housing 200 and the second housing 300.

[0034] Specifically, the first guide member 11 is disposed at the bottom of the electrical equipment housing in the direction of gravity, and the height of the first guide member 11 is lower than the height of the bottom connection 400 of the electrical equipment housing. In this way, when the salt spray liquid flows along the surface of the electrical equipment housing towards the bottom connection 400, the first guide member 11 can block the salt spray liquid and prevent the salt spray liquid from flowing to the bottom connection 400.

[0035] The plurality of flow guides also include a second flow guide 12, which is disposed on the side of the electrical equipment housing when in use, to prevent salt spray from accumulating on the side of the electrical equipment housing at the joint surface of the first housing 200 and the second housing 300.

[0036] Taking the electric drive assembly housing as an example, Figure 1 is a schematic diagram of the electric drive assembly in use. After the salt spray liquefies, some of it will flow downwards along the front side of the first housing 200 in use, that is, the right side surface of the first housing 200, and finally accumulate at the junction of the bottom surfaces of the first housing 200 and the second housing 300. The first guide member 11 can guide the salt spray liquid flowing down from the front side of the first housing 200, preventing it from flowing to the junction of the bottom surfaces of the first housing 200 and the second housing 300.

[0037] The sides of the electrical equipment housing in its operational state are also the sides of the first housing 200 and the second housing 300. After the salt spray liquefies, some of it flows downwards along the sides and eventually accumulates at the junction of the bottom surfaces of the first housing 200 and the second housing 300. The second guide member 12 can guide the salt spray liquid flowing down the sides, allowing it to fall directly and thus preventing it from flowing to the junction of the bottom surfaces of the first housing 200 and the second housing 300.

[0038] Specifically, the second guide member 12 has a first end 121 and a second end 122. The first end 121 is connected to the electrical equipment housing, and is offset from the bottom connection 400. Along the direction of gravity, the height of the second end 122 is lower than the height of the first end 121. Thus, after the salt spray liquid flows along the side wall of the electrical equipment housing onto the second guide member 12, the second guide member 12 can guide the salt spray liquid to flow away from the electrical equipment housing, thereby preventing the salt spray liquid from accumulating at the bottom connection 400 of the electrical equipment housing.

[0039] This invention, through the first guide member 11 and the second guide member 12, prevents salt spray liquid from flowing to the mating surface between the first housing 200 and the second housing 300, thereby reducing corrosion. Therefore, this invention can improve the corrosion resistance of electrical equipment housings.

[0040] According to some embodiments of the present invention, referring to Figures 2-4, the first guide member 11 protrudes downward and extends along the bottom of the first housing 200 so that the bottom surfaces of the first housing 200 and the second housing 300 form a step.

[0041] Taking Figure 3 as an example, the first guide member 11 extends downward. When some salt spray liquid flows downward along the front of the first housing 200 to the bottom surface of the first housing 200, the first guide member 11 blocks and intercepts the salt spray liquid, and the salt spray liquid will fall downward along the first guide member 11, thereby preventing it from flowing to the junction of the bottom surfaces of the first housing 200 and the second housing 300.

[0042] The first guide member 11 extends along the bottom of the first housing 200, meaning that the first guide member 11 extends horizontally in Figure 3. That is, the first guide member 11 is located on the entire bottom surface of the first housing 200, which can completely intercept the salt spray liquid flowing down from the front of the first housing 200, thus improving the blocking effect of the salt spray liquid.

[0043] It should be noted that, as shown in Figures 2 and 3, when the bottom surface of the first housing 200 is a non-planar structure with curvature, the corresponding side of the first guide member 11 that is in contact with the first housing 200 is also set as a non-planar structure with curvature. That is, the first guide member 11 and the bottom surface of the first housing 200 should be fitted together to prevent the salt spray liquid from flowing from the gap between the first guide member 11 and the first housing 200 to the junction of the bottom surfaces of the first housing 200 and the second housing 300.

[0044] Specifically, referring to Figures 1 and 2, the first guide member 11 is continuously arranged along the extension direction of the bottom connection 400, so that the first guide member 11 can block the salt spray liquid flowing from multiple parts of the surface of the electrical equipment housing to the bottom connection 400.

[0045] In another embodiment, the surface of the first housing 200 is provided with a plurality of reinforcing ribs, and the first guide member 11 protrudes from the bottom of the reinforcing rib when in use, or the first guide member 11 is a concave structure opened at the bottom of the reinforcing rib when in use. Because the first guide member 11 is added to the bottom of the reinforcing rib, or a concave structure is opened at the bottom of the reinforcing rib to form the first guide member 11, the salt spray can fall off at the protruding first guide member 11 or the concave position, and will not flow along the reinforcing rib to the joint surface of the first housing 200 and the second housing 300.

[0046] According to some embodiments of the present invention, the second guide member 12 is disposed on one or both sides of the first housing 200 and / or the second housing 300, for guiding the salt spray liquid on the side of the first housing 200 and / or the side of the second housing 300.

[0047] The second flow guide 12 being disposed on the first housing 200 and / or the second housing 300 means that the second flow guide can be disposed on the first housing 200, or on the second housing 300, or on both the first housing 200 and the second housing 300.

[0048] For example, referring to FIG1, the second guide member 12 is disposed across the first housing 200 and the second housing 300, that is, the second guide member 12 is located at the joint surface of the first housing 200 and the second housing 300.

[0049] Taking Figure 4 as an example, the second guide member 12 being located on one or both sides of the first housing 200 and / or the second housing 300 means along the horizontal direction in Figure 4. The second guide member 12 can be located on the left side of the first housing 200 and / or the second housing 300, or on the right side of the first housing 200 and / or the second housing 300, or on both the left and right sides of the first housing 200 and / or the second housing 300. This can effectively intercept the salt spray liquid on both sides of the housing.

[0050] According to some embodiments of the present invention, at least one second guide member 12 is positioned on the first housing 200 and / or the second housing 300 close to the bottom surface when in use; and / or, at least one second guide member 12 is positioned on the first housing 200 and / or the second housing 300 in the middle region in the vertical direction when in use.

[0051] At least one second flow guide 12 is positioned on the first housing 200 and / or the second housing 300 near the bottom surface in the use state, meaning that at least one second flow guide 12 is disposed on the side of the first housing 200 and / or the second housing 300 and near the bottom surface. At least one second flow guide 12 is positioned on the first housing 200 and / or the second housing 300 in the middle region in the vertical direction in the use state, meaning that at least one second flow guide 12 is disposed on the side of the first housing 200 and / or the second housing 300 and in the middle region in the vertical direction.

[0052] Taking Figure 4 as an example, a second guide member 12 is provided at the bottom of the left side surface of the electrical equipment housing, and the first guide member 12 is located at the junction of the first housing 200 and the second housing 300; another second guide member 12 is provided in the middle area of ​​the right side surface of the electrical equipment housing, which is also located at the junction of the first housing 200 and the second housing 300. The two second guide members 12 provided on both sides can improve the interception effect of salt spray liquid.

[0053] According to some embodiments of the present invention, referring to FIG4, the second guide member 12 is inclined.

[0054] The second guide member 12 is inclined, meaning it is set at an angle to the horizontal plane. This allows the salt spray liquid flowing to the second guide member 12 to flow outwards along it until it drips. If the second guide member 12 is set horizontally, the salt spray liquid is prone to accumulation; if it is set vertically, the salt spray liquid may flow along it to the surface of the first housing 200.

[0055] According to some embodiments of this utility model, referring to Figures 1 and 4, the second flow guide 12 is a baffle structure. The second flow guide 12 being a baffle structure means that the second flow guide 12 is a rib provided on the surface of the shell. Taking Figures 1 and 3 as examples, in order to ensure the interception effect of salt spray liquid, the rib extends along the surface of the shell for a certain length.

[0056] In some embodiments, referring to FIG1, the second flow guide 12 may be connected to both the first housing 100 and the second housing 200. Specifically, the second flow guide 12 may include a first flow guide portion and a second flow guide portion, the first flow guide portion being connected to the first housing 100 and the second flow guide portion being connected to the second housing 200. The first flow guide portion and the second flow guide portion are mated to form the second flow guide 12.

[0057] According to some embodiments of the present invention, the first housing 200 and / or the second housing 300 are provided with recessed threaded connection holes, and the first housing 200 and the second housing 300 are connected by bolts, with insulating glue on the outer periphery of the bolts.

[0058] Referring to Figure 1, the first housing 200 is provided with a recessed threaded connection hole. The bolt connects the first housing 200 and the second housing 300 through the threaded connection hole. The insulating glue is applied to the outer periphery of the bolt to prevent galvanic corrosion.

[0059] According to some embodiments of this utility model, the bolt is made of magnesium alloy, or the surface of the bolt is coated with a magnesium alloy coating. When this bolt is used to connect the first housing 200 made of magnesium alloy and the second housing 300 made of a different material, the overall potential difference can be greatly reduced, thereby mitigating the degree of galvanic corrosion.

[0060] According to some embodiments of the present invention, the electrical equipment housing is an electric drive assembly housing, which includes an integrated housing and an end cover connected to the integrated housing; wherein, the end cover is a first housing 200 and the integrated housing is a second housing 300.

[0061] According to some embodiments of the present invention, the present invention also provides an electric drive assembly, the housing of which includes the anti-corrosion structure of any of the above-mentioned electrical equipment housings.

[0062] According to some embodiments of the present invention, referring to Figures 1-4, the present invention provides an electric drive assembly, including an anti-corrosion structure 100, a first housing 200 (end cover), and a second housing 300 (integrated housing). The anti-corrosion structure 100 includes a first guide member 11 and a second guide member 12. The first guide member 11 is a boss structure disposed on the bottom surface of the first housing 200 in the use state. The first guide member 11 extends along the bottom surface of the first housing 200 in the use state to prevent salt spray liquid flowing down the front side of the electric drive assembly in the use state from flowing to the junction of the bottom surfaces of the first housing 200 and the second housing 300. Two second guide members 12 are provided, one of which is disposed on the front surface of the electric drive assembly housing, and the other of which is disposed on the rear surface of the electric drive assembly housing. Both second guide members 12 are disposed at the junction of the first housing 200 and the second housing 300. The second guide 12 located on the front surface is positioned close to the bottom surface of the electric drive assembly in its operating state, while the second guide 12 located on the rear surface is positioned in the middle region of the electric drive assembly in its vertical direction during operation. The second guide 12 is an inclined baffle structure used to prevent the salt spray liquid flowing down the side of the electric drive assembly during operation from flowing to the junction of the bottom surfaces of the first housing 200 and the second housing 300.

[0063] In the description of this specification, the references to the terms "embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0064] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A corrosion-resistant structure for an electrical equipment housing, the electrical equipment housing comprising a first housing and a second housing connected to each other, characterized in that, The first and second housings are made of metal, and the materials of the first and second housings are different. Along the direction of gravity, the first and second housings have a bottom connection. The anti-corrosion structure includes: A flow guide is disposed on the electrical equipment housing, the flow guide being configured to block liquid from flowing from the surface of the electrical equipment housing to the bottom connection.

2. The anti-corrosion structure for the electrical equipment housing according to claim 1, characterized in that, The number of the flow guides is multiple, and the multiple flow guides include a first flow guide. Along the direction of gravity, the first flow guide is disposed at the bottom of the electrical equipment housing, and the height of the first flow guide is lower than the height of the bottom connection.

3. The anti-corrosion structure for the electrical equipment housing according to claim 2, characterized in that, The first guide member is continuously arranged along the extension direction of the bottom connection.

4. The anti-corrosion structure for the electrical equipment housing according to claim 2, characterized in that, The plurality of flow guides further include a second flow guide; The second guide has a first end and a second end, the first end being connected to the electrical equipment housing, and the first end being offset from the bottom connection point; Along the direction of gravity, the height of the second end is lower than the height of the first end.

5. The anti-corrosion structure for the electrical equipment housing according to claim 4, characterized in that, The direction from the first housing to the second housing is the first direction, and the direction from the second guide to the electrical equipment housing is the second direction. The first direction and the second direction intersect.

6. The anti-corrosion structure for the electrical equipment housing according to claim 4, characterized in that, A portion of the second flow guide is connected to the first housing, and another portion of the second flow guide is connected to the second housing.

7. The anti-corrosion structure for the electrical equipment housing according to claim 4, characterized in that, The number of the second flow guide is multiple, and the multiple second flow guides are spaced apart on the electrical equipment housing.

8. The anti-corrosion structure for the electrical equipment housing according to any one of claims 1-7, characterized in that, The first housing is made of magnesium alloy.

9. The anti-corrosion structure for the housing of electrical equipment according to any one of claims 1-7, characterized in that, The first housing and / or the second housing are provided with recessed threaded connection holes, and the first housing and the second housing are connected by bolts, with insulating adhesive on the outer periphery of the bolts.

10. The anti-corrosion structure for the electrical equipment housing as described in claim 9, characterized in that, The bolt is made of magnesium alloy, or the surface of the bolt is coated with a magnesium alloy coating.

11. The anti-corrosion structure for the housing of electrical equipment according to any one of claims 1-7, characterized in that, The electrical equipment housing is an electric drive assembly housing, which includes an integrated housing and an end cover connected to the integrated housing; wherein the end cover is the first housing and the integrated housing is the second housing.

12. An electric drive assembly, characterized in that, The corrosion-resistant structure includes the electrical equipment housing as described in any one of claims 1-11.

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