Motor rear end cover, electric drive assembly, lubricating and cooling system and vehicle

Abstract

The utility model discloses a motor rear end cover, an electric drive assembly, a lubrication cooling system and a vehicle. The motor rear end cover comprises a first body and a filtering member. The first body is provided with a first flow channel and a first connecting part, the first connecting part is used for installing a rear bearing of the motor, one end of the first flow channel is located at the first connecting part, and the filtering piece is arranged in the first flow channel to filter oil flowing to the first connecting part. Lubricating oil flowing to the rear bearing can be filtered, the cleanliness of the lubricating oil flowing to the rear bearing is improved, and the problems of abnormal abrasion and abnormal sound of the rear bearing are solved.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, specifically relating to a motor rear end cover, an electric drive assembly, a lubrication and cooling system, and a vehicle. Background Technology

[0002] When the electric drive assembly is operating, it generates significant heat due to the flow of current or friction between components. To improve the drive power and operational reliability of the electric drive assembly, a cooling system is required to cool the relevant parts.

[0003] In related technologies, an oil cooling system delivers cooled lubricating oil to the stator core, windings, and rear bearing of the electric drive assembly to achieve cooling. However, metal impurities, iron filings from gear meshing, and fibers from the insulation material inside the stator of the motor, generated during the production of the electric drive assembly, can all lead to excessive cleanliness of the lubrication cooling oil circuit. When lubricating and cooling the rear bearing of the motor, these foreign objects can enter the rear bearing, causing abnormal wear of the steel balls and inner and outer rings, and producing abnormal noise. Utility Model Content

[0004] This utility model aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, embodiments of this utility model propose a motor rear end cover that can filter the lubricating oil flowing to the rear bearing, improve the cleanliness of the lubricating oil flowing to the rear bearing, and solve the problems of abnormal wear and abnormal noise of the rear bearing.

[0006] An embodiment of this utility model proposes an electric drive assembly.

[0007] An embodiment of this utility model further proposes a lubrication and cooling system.

[0008] An embodiment of this utility model also proposes a vehicle.

[0009] According to an embodiment of the present utility model, the motor rear end cover includes a first body and a filter element;

[0010] The first body has a first flow channel and a first connecting part. The first connecting part is used to install the rear bearing of the motor. One end of the first flow channel is located at the first connecting part. The filter element is disposed in the first flow channel to filter the oil flowing to the first connecting part.

[0011] In some embodiments, the end of the first flow channel away from the first connection portion has a first opening and a second opening. The first opening is used to communicate with the flow channel in the motor housing, and a sealing member is provided at the second opening. The filter element is provided correspondingly to the first opening.

[0012] In some embodiments, the end of the first flow channel away from the first connection portion has a second connection portion, and the filter element abuts between the second connection portion and the sealing element.

[0013] In some embodiments, a magnetic element is also included, which is disposed within the first flow channel.

[0014] In some embodiments, a filter cavity is defined between the filter element and the first opening, and at least a portion of the magnetic element is located in the filter cavity.

[0015] In some embodiments, the magnetic element has a first section and a second section, the first section abutting between the filter element and the sealing element, the second section being located within the filter cavity and disposed near the first opening.

[0016] In some embodiments, the filter element has a cylindrical sidewall and a bottom wall, and the cylindrical sidewall of the filter element is provided with a communication port, wherein the first opening and the communication port are correspondingly connected.

[0017] The electric drive assembly of this utility model includes a motor, the motor having a motor housing, a rear bearing and a motor rear end cover as described in any of the above embodiments, the motor housing and the motor rear end cover being connected, and the flow channel in the motor housing communicating with the first flow channel, the rear bearing being disposed at the first connection portion.

[0018] The lubrication and cooling system of this utility model embodiment includes the electric drive assembly described in any of the above embodiments.

[0019] The vehicle of this utility model embodiment includes the motor rear end cover, the electric drive assembly, or the lubrication and cooling system described in any of the above embodiments.

[0020] The rear end cover of the motor in this embodiment of the present invention can filter the lubricating oil flowing to the rear bearing by setting a filter element in the first flow channel, thereby filtering out foreign objects such as iron filings, aluminum filings, and material fibers in the lubricating oil, improving the cleanliness of the lubricating oil flowing to the rear bearing, preventing foreign objects from entering the rear bearing and causing abnormal wear of the steel balls and inner and outer rings, improving the service life of the rear bearing, solving the problem of abnormal noise in the rear bearing, and improving the NVH performance of the electric drive assembly. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of the motor rear end cover according to an embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of the disassembled structure of the motor rear end cover and rear bearing according to an embodiment of this utility model.

[0023] Figure 3 This is a schematic diagram of the structure of the electric drive assembly according to an embodiment of the present invention.

[0024] Figure label:

[0025] 100. Electric drive assembly;

[0026] 1. Rear end cover of the motor;

[0027] 11. First body; 111. First flow channel; 1111. First straight segment; 1112. Second straight segment; 112. First connecting part; 113. Second connecting part; 114. First opening; 115. Second opening; 116. Sealing component;

[0028] 12. Filter element; 121. Cylindrical sidewall; 122. Bottom wall; 123. Connecting port;

[0029] 13. Magnetic components;

[0030] 2. Motor housing;

[0031] 3. Rear bearing; 31. Bearing steel sleeve;

[0032] 4. Gearbox housing;

[0033] 5. Heat exchanger. Detailed Implementation

[0034] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0035] See Figure 1 and Figure 2 The motor rear end cover 1 of this utility model embodiment includes a first body 11 and a filter element 12. The first body 11 has a first flow channel 111 and a first connecting part 112. The first connecting part 112 is used to install the rear bearing 3 of the motor. One end of the first flow channel 111 corresponds to the first connecting part 112. It should be understood that the first body 11 is the rear end cover body, and the first flow channel 111 is located in the first body 11. The first flow channel 111 can be formed simultaneously with the molding of the first body 11, or it can be formed by machining after the molding of the first body 11. The first connecting part 112 is used to install the rear bearing 3. For example, the first connecting part 112 is a groove for installing the rear bearing 3, and the rear bearing 3 is installed at the first connecting part 112 through the bearing steel sleeve 31.

[0036] One end of the first flow channel 111 is located at the first connecting part 112, thereby enabling the lubricating oil to be delivered to the rear bearing 3 for lubrication and cooling, and improving the performance of the rear bearing 3.

[0037] In this embodiment of the invention, the filter element 12 is disposed within the first flow channel 111 to filter the oil flowing toward the first connecting portion 112. The filter element 12 is used to filter the lubricating oil within the first flow channel 111, and can filter out impurities such as iron filings, aluminum filings, and fibers in the lubricating oil, thereby improving the cleanliness of the lubricating oil flowing toward the first connecting portion 112.

[0038] In this embodiment of the utility model, the motor rear end cover 1, by setting a filter element 12 in the first flow channel 111, can filter the lubricating oil flowing to the rear bearing 3, thereby filtering out foreign matter such as iron filings, aluminum filings, and material fibers in the lubricating oil, improving the cleanliness of the lubricating oil flowing to the rear bearing 3, preventing foreign matter from entering the rear bearing 3 and causing abnormal wear of the steel balls and inner and outer rings, improving the service life of the rear bearing 3, solving the problem of abnormal noise in the rear bearing 3, and improving the NVH performance of the electric drive assembly 100.

[0039] In some embodiments, the end of the first flow channel 111 away from the first connection portion 112 has a first opening 114 and a second opening 115. The first opening 114 is used to communicate with the flow channel in the motor housing 2, and a sealing member 116 is provided at the second opening 115. The filter member 12 is correspondingly provided with the first opening 114.

[0040] It should be noted that in the oil cooling system of the electric drive assembly 100, lubricating oil is transported and distributed along the flow channels and oil grooves in the housings of the motor and reducer, and then delivered to different locations for lubrication and cooling of the components at those locations. For the cooling of the rear bearing 3 in the motor, a portion of the oil needs to flow through the flow channels of the motor housing 2 into the first flow channel 111 of the rear end cover 1 of the motor, and then be delivered to the rear bearing 3.

[0041] In this embodiment of the present invention, after the motor housing 2 and the motor rear end cover 1 are connected together, the first opening 114 of the first flow channel 111 is connected to the flow channel on the motor housing 2. The filter element 12 can be placed into the first flow channel 111 through the second opening 115. The sealing element 116 is used to seal the second opening 115, and at the same time, the sealing element 116 can also fix the filter element 12.

[0042] For example, the filter element 12 is connected to one end of the sealing element 116 that extends into the first flow channel 111. After the filter element 12 is placed into the first flow channel 111, it is fixed by connecting the sealing element 116 to the motor rear end cover 1, thus completing the fixation of the filter element 12.

[0043] Furthermore, since the first flow channel 111 is not a straight flow channel, it can be divided into multiple segments for separate processing, and the second opening 115 can serve as a process port for a portion of the first flow channel 111 during machining or integral molding.

[0044] For example, the first flow channel 111 includes a first straight segment 1111 and a second straight segment 1112, which facilitates the processing of the two straight segments. The first straight segment 1111 and the second straight segment 1112 have a preset included angle. The first straight segment 1111 can extend radially (up and down direction as shown in the figure) along the rear end cover 1 of the motor. One end of the second straight segment 1112 intersects and connects with the first straight segment 1111, and the other end of the second straight segment 1112 connects with the first connecting part 112. At this time, the second opening 115 serves as the process port when the first straight segment 1111 is processed and formed. The first opening 114 can extend axially (left and right direction as shown in the figure) along the rear end cover 1 of the motor and intersects and connects with the first flow channel 111.

[0045] In some embodiments, the end of the first flow channel 111 away from the first connection portion 112 has a second connection portion 113, and the filter element 12 abuts between the second connection portion 113 and the sealing element 116.

[0046] In other words, a second connecting part 113 is provided in the first flow channel 111, and the filter element 12 is arranged at the second connecting part 113, thereby ensuring the structural stability of the filter element 12 and preventing the filter element 12 from being displaced or laterally deflected in the first flow channel 111 due to the impact of the lubricating oil.

[0047] Optionally, the second connecting part 113 is a countersunk hole, which is coaxially arranged with the first flow channel 111 at the corresponding position. At the same time, the radial dimension of the countersunk hole is larger than the radial dimension of the first flow channel 111. A stepped surface is formed between the side wall of the countersunk hole and the side wall of the first flow channel 111. The stepped surface can abut against one end of the filter element 12, and the sealing member 116 abuts against the other end of the filter element 12, thereby ensuring that the filter element 12 is effectively fixed in the first flow channel 111.

[0048] Furthermore, the difference between the radial dimension of the countersunk hole and the radial dimension of the first flow channel 111 can be equal to or slightly greater than the wall thickness of the filter element 12, so that the radial dimension of the inner cavity of the filter element 12 is not less than the radial dimension of the first flow channel 111, thus avoiding the impact on the flow rate of lubricating oil in the first flow channel 111 due to the filter element 12 being arranged in the first flow channel 111.

[0049] In some embodiments, the motor rear end cover 1 further includes a magnetic element 13, which is disposed within the first flow channel 111.

[0050] It should be understood that during the operation of the electric drive assembly 100, due to the small particle size of iron filings generated by the rotational friction of some components, the filter element 12 cannot effectively filter the small particle size iron filings. The magnetic element 13 is magnetic, and can effectively adsorb iron filings and magnetic substances in the oil, thereby further improving the cleanliness of the oil.

[0051] Optionally, the magnetic component 13 is a magnet block. Without affecting the flow of oil in the first flow channel 111, the magnetic component 13 is arranged to adsorb and capture iron filings.

[0052] In some embodiments, a filter cavity is defined between the filter element 12 and the first opening 114, and at least a portion of the magnetic element 13 is located in the filter cavity.

[0053] Specifically, the filter element 12 is disposed within the first flow channel 111, dividing the first flow channel 111 into two parts. A filter chamber is formed between the filter element 12 and the first opening 114. After the lubricating oil enters the filter chamber, it is filtered by the filter element 12 and then flows to the rear bearing 3. At least a portion of the magnetic element 13 is disposed in the filter chamber, which can capture iron filings entering the first flow channel 111 in a timely manner, improve the capture and adsorption effect of iron filings, and reduce the filtration burden on the filter element 12.

[0054] In some embodiments, the magnetic element 13 has a first section and a second section, the first section abutting between the filter element 12 and the sealing element 116, the second section being located inside the filter cavity and disposed near the first opening 114.

[0055] It should be understood that the magnetic element 13 is disposed between the sealing element 116 and the filter element 12. Specifically, the first section of the magnetic element 13 abuts between the sealing element 116 and the filter element 12, and the second section of the magnetic element 13 is located in the filter cavity and is disposed close to the first opening 114. At this time, it can better capture and adsorb iron filings in the lubricating oil entering the first flow channel 111.

[0056] Optionally, the longitudinal section of the magnetic component 13 is T-shaped, and both the first and second sections are cylindrical. The radial dimension of the first section of the magnetic component 13 is larger than that of the second section. During assembly, the filter component 12 is first placed into the first flow channel 111 and abuts against the stepped surface of the first connecting part 112. Then, the magnetic component 13 is placed into the first flow channel 111, and the first section of the magnetic component 13 abuts against the filter component 12. At this time, the second section extends into the filter cavity and is positioned close to the first opening 114. Finally, the sealing component 116 is tightened, and the sealing component 116 abuts against the magnetic component 13.

[0057] Optionally, the sealing element 116 is a cup-shaped plug or a sealing bolt.

[0058] Optionally, the filter element 12 is a filter screen. The pore size of the filter screen can be set according to actual requirements.

[0059] In some embodiments, the filter element 12 has a cylindrical sidewall 121 and a bottom wall 122. The cylindrical sidewall 121 of the filter element 12 is provided with a communication port 123, and the first opening 114 and the communication port 123 are connected accordingly.

[0060] The cylindrical sidewall 121 of the filter element 12 is cylindrical. The filter element 12 has a cavity (i.e., a filter chamber). One end of the filter element 12 is open, and the open end of the filter element 12 faces the second opening 115. The other end of the filter element 12 has a bottom wall 122. The cylindrical sidewall 121 of the filter element 12 is provided with a connecting port 123, which is connected to the first opening 114. This allows the lubricating oil flowing from the first opening 114 into the motor rear end cover 1 to enter the filter element 12 through the connecting port 123, so that it is not blocked by the cylindrical sidewall 121 of the filter element 12. This prevents impurities in the lubricating oil flowing from the first opening 114 into the filter element 12 from being blocked on the outside of the cylindrical sidewall 121, which would affect the later maintenance and cleaning.

[0061] In this embodiment of the invention, both the cylindrical sidewall 121 and the bottom wall 122 are provided with filter holes, or filter holes are provided only on the bottom wall 122.

[0062] In this embodiment of the present invention, the second section of the magnetic component 13 extends into the cavity. The second section of the magnetic component 13 is positioned as close as possible to the first opening 114 without affecting the flow of lubricating oil from the first opening 114 to the first connecting part 112, thereby improving the adsorption and capture effect of iron filings. For example, the second section of the magnetic component 13 extends to the intersection of the first opening 114 and the first flow channel 111.

[0063] like Figure 3 As shown, the electric drive assembly 100 of this utility model embodiment includes a motor. The motor has a motor housing 2, a rear bearing 3 and a motor rear end cover 1 in any of the above embodiments. The motor housing 2 and the motor rear end cover 1 are connected, and the flow channel in the motor housing 2 is connected to the first flow channel 111. The rear bearing 3 is located at the first connection part 112.

[0064] In other words, after the motor housing 2 and the motor rear end cover 1 are connected and assembled, the flow channel of the motor housing 2 and the first flow channel 111 of the motor rear end cover 1 are connected. Some of the lubricating oil flows into the first flow channel 111 through the flow channel of the motor housing 2, and then flows to the first connecting part 112 to lubricate and cool the rear bearing 3.

[0065] like Figure 3 As shown, the lubrication and cooling system of this utility model embodiment includes the electric drive assembly 100 in any of the above embodiments.

[0066] Specifically, the electric drive assembly 100, which is equipped with an oil cooling system, has interconnected flow channels inside both the reducer housing 4 and the motor housing 2. The lubrication and cooling system includes an oil pump and a heat exchanger 5. The oil pump draws lubricating oil from the reducer, and the lubricating oil flows into the heat exchanger 5 after passing through the flow channel in the reducer housing 4 to exchange heat between the lubricating oil and cooling water, thereby cooling the lubricating oil. Part of the lubricating oil enters the stator core oil groove through the flow channel in the motor housing 2, and part of the lubricating oil enters the flow channel on the rear side of the motor housing 2. Then, the lubricating oil in the flow channel on the rear side of the motor housing 2 passes through the first flow channel 111 of the motor rear end cover 1 and flows into the rear bearing 3 of the motor through the flow channel opening of the bearing steel sleeve 31, thereby achieving lubrication and cooling of the rear bearing 3.

[0067] In addition, by arranging oil outlets connected to the flow channel at different positions on the motor housing 2, the lubricating oil in the lubrication and cooling system, after being cooled, will also flow through the windings, intermediate bearings, rotor shafts and other components in the electric drive assembly 100, thereby cooling the corresponding components.

[0068] The vehicle of this utility model embodiment includes the motor rear end cover 1 of any of the above embodiments, or the electric drive assembly 100, or the lubrication and cooling system.

[0069] The vehicle of this utility model embodiment has at least some of the same beneficial effects as the motor rear end cover 1, or electric drive assembly 100, or lubrication and cooling system in the above embodiments, so they will not be described again.

[0070] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "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 are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 utility model.

[0071] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0072] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0073] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0074] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0075] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A motor rear end cover, characterized in that, Includes the first body and the filter element; The first body has a first flow channel and a first connecting part. The first connecting part is used to install the rear bearing of the motor. One end of the first flow channel is located at the first connecting part. The filter element is disposed in the first flow channel to filter the oil flowing to the first connecting part.

2. The motor rear end cover according to claim 1, characterized in that, The end of the first flow channel away from the first connection portion has a first opening and a second opening. The first opening is used to communicate with the flow channel in the motor housing. A sealing element is provided at the second opening. The filter element is provided correspondingly to the first opening.

3. The motor rear end cover according to claim 2, characterized in that, The end of the first flow channel away from the first connecting portion has a second connecting portion, and the filter element abuts between the second connecting portion and the sealing element.

4. The motor rear end cover according to claim 3, characterized in that, It also includes a magnetic component, which is disposed within the first flow channel.

5. The motor rear end cover according to claim 4, characterized in that, A filter cavity is defined between the filter element and the first opening, and at least a portion of the magnetic element is located within the filter cavity.

6. The motor rear end cover according to claim 5, characterized in that, The magnetic component has a first section and a second section. The first section abuts between the filter component and the sealing component, and the second section is located inside the filter cavity and is positioned close to the first opening.

7. The motor rear end cover according to any one of claims 2-6, characterized in that, The filter element has a cylindrical sidewall and a bottom wall, and a connecting port is provided on the cylindrical sidewall of the filter element. The first opening and the connecting port are connected to each other.

8. An electric drive assembly, characterized in that, The device includes a motor, which has a motor housing, a rear bearing, and a motor rear end cover as described in any one of claims 1-7. The motor housing and the motor rear end cover are connected, and the flow channel in the motor housing is connected to the first flow channel. The rear bearing is located at the first connection portion.

9. A lubrication and cooling system, characterized in that, Includes the electric drive assembly as described in claim 8.

10. A vehicle, characterized in that, Includes the motor rear end cover as described in any one of claims 1-7, or the electric drive assembly as described in claim 8, or the lubrication and cooling system as described in claim 9.

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