Electric drive axle oil-cooled motor
By arranging the suction filter and the pressure filter side by side in the oil-cooled motor, the oil flow path is optimized, solving the problems of insufficient filtration accuracy and large radial space occupation of the oil filter. This achieves a long service life for the oil pump and a compact design for the electric drive bridge, reducing maintenance costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU LEGO MOTORS CO LTD
- Filing Date
- 2025-06-19
- Publication Date
- 2026-06-16
AI Technical Summary
The existing oil cooling system has poor oil filter filtration accuracy, severe wear of oil pump components, and the oil pump and motor arrangement occupies a large radial space, making the design of the electric drive bridge structure difficult.
The suction filter and the filter press are arranged side by side and closely adjacent to each other. The oil pump and the main body of the oil-cooled motor are axially parallel. The suction filter is located at the oil inlet for coarse filtration, and the filter press is located at the oil outlet for fine filtration. The oil cooler cools the oil, optimizes the oil flow path, and reduces the radial space requirement.
It improves oil cleanliness, extends oil pump life, reduces maintenance costs, is suitable for electric drive bridge structures with limited radial space, and ensures the stability and compactness of the oil-cooled motor of the electric drive bridge.
Smart Images
Figure CN224367672U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of oil-cooled motor technology, specifically to an oil-cooled motor for an electric drive bridge. Background Technology
[0002] In the current field of oil cooling system technology, some technical solutions have certain limitations and urgently need to be improved to meet the ever-increasing performance requirements.
[0003] See Figure 1 Regarding the arrangement of oil filters, existing technical solutions typically only place one oil filter (i.e., suction filter 200) on the oil suction side of the oil pump 100. Relying solely on the suction filter 200 results in relatively poor filtration accuracy, making it difficult to adequately guarantee the cleanliness of the entire oil product. Impurities remaining in the oil will continuously cause wear to the internal components (such as gears and blades) of the oil pump 100 during operation, affecting the lifespan of the oil pump 100.
[0004] See Figure 1 , Figure 2 From the perspective of the arrangement of the oil pump and motor, in the existing technical solution, the axes of the oil pump 100 and the motor 300 are arranged at a perpendicular angle. Because the axial dimension of the oil pump 100 is relatively long, when the motor 300 is installed on the space-constrained electric drive bridge, the longer oil pump 100 will occupy a significant amount of radial space. This presents a problem of layout difficulties for the compact structural design of the electric drive bridge.
[0005] Therefore, how to overcome the shortcomings of the existing technology mentioned above has become the subject of this utility model. Utility Model Content
[0006] The purpose of this invention is to provide an oil-cooled motor for an electric drive bridge.
[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0008] An oil-cooled motor for an electric drive bridge, comprising:
[0009] The oil-cooled motor body includes an oil cooler and an oil pan. The oil pan is located at the bottom end of the oil-cooled motor body along the radial direction of the oil-cooled motor body, and the oil pan is provided with an oil outlet.
[0010] A suction filter is located on the side of the oil outlet.
[0011] An oil pump has an oil inlet end and an oil outlet end, wherein the oil inlet end is connected to the suction filter;
[0012] A filter press is connected to the oil outlet end;
[0013] The axial direction of the oil-cooled motor body, the length direction of the suction filter, the length direction of the oil pump, and the length direction of the filter press are parallel to the length direction of the filter press.
[0014] The oil cooler is used to cool the oil output from the filter press, providing a basis for subsequent cooling of the stator and rotor inside the oil-cooled motor. The oil cooler is an existing feature and will not be described in detail here.
[0015] It should be noted that this application does not change the basic working principle of the oil-cooled motor of the electric drive bridge.
[0016] In the above scheme, both the suction filter and the pressure filter are oil filters. The suction filter is located at the oil inlet end of the oil pump and is used to coarsely filter the oil in the oil-cooled motor body before it enters the oil pump through the oil outlet on the oil pan. The pressure filter is located at the oil outlet end of the oil pump and is used to finely filter the oil during the separation process between the oil and the oil pump. The cleanliness of the oil is improved through two rounds of filtration, thereby extending the service life of these structures of the oil pump and ensuring the long-term operational stability of the electric drive bridge oil-cooled motor.
[0017] The axial direction of the oil-cooled motor body is parallel to the length direction of the oil pump, which reduces the radial space requirement of the oil-cooled motor, making this application applicable to electric drive bridge structures with limited radial space.
[0018] The axial direction of the oil-cooled motor body is also parallel to the length direction of the suction filter and the filter press, so as to avoid increasing the radial space requirement of the oil-cooled motor due to the two, especially for the added filter press.
[0019] A further technical solution involves arranging the oil pump and the suction filter side-by-side adjacent to each other along the axial direction of the oil-cooled motor body. This arrangement improves the radial space utilization and structural compactness of the oil-cooled motor, thereby further expanding the applicability of the oil-cooled motor for the electric drive bridge of this application.
[0020] The side-by-side arrangement also facilitates the individual disassembly of the suction filter, avoiding the traditional method of disassembling the oil pump first and then the suction filter, thus improving the maintenance convenience of the electric drive bridge oil-cooled motor and reducing maintenance costs.
[0021] In a further technical solution, the suction filter, the oil pump, and the filter press are all located on the radial side of the oil-cooled motor body. This arrangement improves the utilization rate of the circumferential space of the oil-cooled motor body by the electric drive bridge oil-cooled motor, thereby further expanding the applicability of the electric drive bridge oil-cooled motor of this application.
[0022] A further technical solution is that, along the axial direction of the oil-cooled motor body, relative to the suction filter, the oil pump, and the pressure filter, both ends of the oil-cooled motor body protrude outwards.
[0023] This embodiment, while satisfying the above-mentioned requirement for reducing the radial space of the (electric drive bridge) oil-cooled motor, avoids increasing the requirement for axial space of the oil-cooled motor, thereby further improving the applicability of the electric drive bridge oil-cooled motor of this application, or in other words, ensuring that the electric drive bridge oil-cooled motor of this application has a large applicability.
[0024] A further technical solution involves positioning the filter press above the oil pump along the radial direction of the oil-cooled motor body. This arrangement facilitates the independent disassembly of the filter press, improves the maintenance convenience of the electric drive bridge oil-cooled motor, and avoids a significant increase in maintenance costs due to the addition of a filter press.
[0025] When the oil-cooled motor is in use, the oil pan is located at the bottom of the main body of the oil-cooled motor. At this time, the suction filter and the oil pump are both located at the bottom side of the main body of the oil-cooled motor, while the filter press is located above the oil pump to avoid the filter press protruding downward relative to the main body of the oil-cooled motor.
[0026] Actual assembly shows that by restricting the position and orientation of the oil pump, suction filter, and filter press, regardless of whether the present application is arranged in the left or right area of the electric drive bridge, the oil pump and other structures do not interfere with other structures in the electric drive bridge. There is no need to replace the oil-cooled motor of the electric drive bridge due to changes in the arrangement position, thus reducing the adjustment cost and structural processing cost of the electric drive bridge.
[0027] A further technical solution involves an oil pan with a guide slope, and the oil outlet located in the low-lying area of the guide slope. With this configuration, the oil outlet is at the lowest point of the guide slope, facilitating the rapid and complete flow of oil towards the oil pan into the oil pump. This effectively improves the pump's ability to pump oil slowly or draw in air, increasing pumping efficiency and ensuring subsequent cooling efficiency and effectiveness.
[0028] When the oil-cooled motor is in use, the oil pan is located at the bottom of the motor body along the radial direction of the motor body, and the oil gradually collects in the area above the guide slope. For example, the guide slope is set downwards, with an upper end and a lower end. The lower end forms a low-lying area, and the oil flows downwards through the oil outlet into the suction filter.
[0029] In one embodiment, the oil pump draws oil from the inside of the oil pan through a primary filter in a suction filter, and then pumps the oil into an oil cooler for cooling through a pressure filter. The oil is then divided into two parts at approximately a 5:1 ratio. Most of the oil enters the stator cooling oil circuit and is sprayed down from the front and rear oil drip rings to cool the windings at both ends of the stator. A smaller portion of the oil enters the rotor cooling oil circuit, cools the rotor core and magnets, and is then sprayed out from the rotor end plate to cool the inner side of the windings at both ends of the stator. Finally, the cooled oil flows back to the inside of the oil pan by gravity for the next round of cooling. This process is repeated to achieve oil circulation and efficient cooling of the motor stator and rotor.
[0030] The terms "first," "second," etc., used in this article do not specifically refer to order or sequence, nor are they intended to limit this case; they are merely used to distinguish components or operations described using the same technical terms.
[0031] The terms "connection" or "positioning" as used in this article can refer to two or more components or devices making direct physical contact with each other, or making indirect physical contact with each other, or to two or more components or devices operating or moving with each other.
[0032] The terms “include,” “including,” and “have” used in this article are all open-ended, meaning they include but are not limited to.
[0033] Unless otherwise specified, the terms used herein generally have their ordinary meaning in the context of the art, the subject matter, and the specific context. Certain terms used to describe this case will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the case.
[0034] The terms “front,” “back,” “up,” “down,” “left,” and “right” used in this article are directional terms. In this case, they are only used to describe the positional relationship between the structures and are not intended to limit the specific direction of the protection scheme or its actual implementation.
[0035] The working principle and advantages of this utility model are as follows:
[0036] Both the suction filter and the pressure filter are oil filters. The suction filter is located at the oil inlet of the oil pump and is used to coarsely filter the oil in the oil-cooled motor body before it enters the oil pump through the oil outlet on the oil pan. The pressure filter is located at the oil outlet of the oil pump and is used to finely filter the oil during the separation process between the oil and the oil pump. The cleanliness of the oil is improved through two rounds of filtration, thereby extending the service life of these structures of the oil pump and ensuring the long-term operational stability of the oil-cooled motor of the electric drive bridge.
[0037] The axial direction of the oil-cooled motor body is parallel to the length direction of the oil pump, which reduces the radial space requirement of the oil-cooled motor, making this application applicable to electric drive bridge structures with limited radial space.
[0038] The axial direction of the oil-cooled motor body is also parallel to the length direction of the suction filter and the filter press, so as to avoid increasing the radial space requirement of the oil-cooled motor due to the two, especially for the added filter press. Attached Figure Description
[0039] Figure 1 This is a schematic diagram of the structure of an oil-cooled motor for an electric drive bridge in the prior art (partial structural cross-section).
[0040] Figure 2 for Figure 1 A structural diagram from another perspective;
[0041] Figure 3 This is a schematic diagram of the structure of the oil-cooled motor of the electric drive bridge in an embodiment of this utility model;
[0042] Figure 4 for Figure 3 A structural diagram from another perspective;
[0043] Figure 5 for Figure 3 Another structural diagram from a different perspective;
[0044] Figure 6 for Figure 3 Another structural schematic diagram (partial structural cross-section processing);
[0045] Figure 7 This is a schematic diagram of the oil flow in the oil-cooled motor of the electric drive bridge according to an embodiment of the present invention.
[0046] In the above attached diagrams: 1. Oil-cooled motor body; 11. Oil cooler; 12. Oil pan; 121. Guide slope; 13. Oil outlet; 2. Suction filter; 3. Oil pump; 4. Filter press; 5. Rotor; 6. Stator; 7. Front oil drain ring; 8. Rear oil drain ring. Detailed Implementation
[0047] The present invention will be further described below with reference to the accompanying drawings and embodiments:
[0048] Example: The present invention will be clearly described below with illustrations and detailed description. Any person skilled in the art who understands the examples of the present invention can make changes and modifications based on the technology taught in the present invention without departing from the spirit and scope of the present invention.
[0049] The terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the scope of this work. Singular forms such as “a,” “this,” “this,” “the,” and “the” as used herein also include plural forms.
[0050] See Figures 3-7 An oil-cooled motor for an electric drive bridge, comprising:
[0051] The oil-cooled motor body 1 includes an oil cooler 11 and an oil pan 12. The oil pan 12 is located at the bottom end of the oil-cooled motor body 1 along the radial direction of the oil-cooled motor body 1, and the oil pan 12 is provided with an oil outlet 13.
[0052] The suction filter 2 is located on the side of the oil outlet 13;
[0053] The oil pump 3 has an oil inlet end (not shown in the figure) and an oil outlet end (not shown in the figure), and the oil inlet end is connected to the suction filter 2;
[0054] Filter press 4 is connected to the oil outlet end;
[0055] The axial direction of the oil-cooled motor body 1, the length direction of the suction filter 2, the length direction of the oil pump 3, and the length direction of the filter press 4 are parallel.
[0056] The oil cooler 11 is used to cool the oil output from the filter press 4, providing a basis for subsequent cooling of the stator and rotor inside the oil-cooled motor body 1. The oil cooler 11 is an existing feature and will not be described in detail here.
[0057] It should be noted that this application does not change the basic working principle of the oil-cooled motor of the electric drive bridge. The connection settings of the filter press 4 and other structures are as they are. For example, the suction filter 2 can be detachably installed on the side of the oil pump 3. This application will not elaborate on this.
[0058] Both the suction filter 2 and the pressure filter 4 are oil filters. The suction filter 2 is located at the oil inlet end of the oil pump 3 and is used to coarsely filter the oil in the oil-cooled motor body 1 before it enters the oil pump 3 through the oil outlet 13 on the oil pan 12. The pressure filter 4 is located at the oil outlet end of the oil pump 3 and is used to finely filter the oil during the separation process between the oil and the oil pump 3. The cleanliness of the oil is improved through two rounds of filtration, thereby extending the service life of these structures of the oil pump 3 and ensuring the long-term operational stability of the electric drive bridge oil-cooled motor.
[0059] The axial direction of the oil-cooled motor body 1 is parallel to the length direction of the oil pump 3, which reduces the radial space requirement of the oil-cooled motor, making this application applicable to electric drive bridge structures with limited radial space.
[0060] The axial direction of the oil-cooled motor body 1 is also parallel to the length direction of the suction filter 2 and the length direction of the filter press 4, so as to avoid the oil-cooled motor's radial space requirement from increasing due to the two, especially for the added filter press 4.
[0061] See Figure 3 , Figure 6 In this embodiment, along the axial direction of the oil-cooled motor body 1, the oil pump 3 and the suction filter 2 are arranged side by side and adjacent to each other (or front and rear adjacent to each other). This arrangement improves the radial space utilization and structural compactness of the oil-cooled motor, thereby further expanding the applicability of the oil-cooled motor of the electric drive bridge in this application.
[0062] The side-by-side arrangement also facilitates the individual disassembly of the suction filter 2, avoiding the traditional method of disassembling the oil pump 3 first and then the suction filter 2, thus improving the maintenance convenience of the electric drive bridge oil-cooled motor and reducing maintenance costs.
[0063] SeeFigures 3-5 In this embodiment, the suction filter 2, the oil pump 3, and the filter press 4 are all located on the radial side of the oil-cooled motor body 1. This arrangement improves the utilization rate of the circumferential space of the oil-cooled motor body 1 by the electric drive bridge oil-cooled motor, thereby further expanding the applicability of the electric drive bridge oil-cooled motor of this application.
[0064] See Figure 6 In this embodiment, along the axial direction of the oil-cooled motor body 1, both ends of the oil-cooled motor body 1 protrude relative to the suction filter 2, the oil pump 3, and the filter press 4. With this configuration, the dimensions of the suction filter 2, the oil pump 3, and the filter press 4 are all smaller than the dimensions of the oil-cooled motor body 1 in the axial direction. The radial dimensions of each structure in the oil-cooled motor body 1 are not limited here.
[0065] This embodiment, while satisfying the above-mentioned requirement for reducing the radial space of the (electric drive bridge) oil-cooled motor, avoids increasing the requirement for axial space of the oil-cooled motor, thereby further improving the applicability of the electric drive bridge oil-cooled motor of this application, or in other words, ensuring that the electric drive bridge oil-cooled motor of this application has a wide range of applicability.
[0066] See Figures 3-5 In this embodiment, the filter press 4 is located above the oil pump 3 along the radial direction of the oil-cooled motor body 1. This arrangement facilitates the independent disassembly of the filter press 4, improves the maintenance convenience of the electric drive bridge oil-cooled motor, and avoids a significant increase in maintenance costs due to the addition of the filter press 4.
[0067] When the oil-cooled motor is in use, the oil pan 12 is located at the bottom of the oil-cooled motor body 1. At this time, the suction filter 2 and the oil pump 3 are both located at the bottom side of the oil-cooled motor body 1, while the filter press 4 is located above the oil pump 3 to prevent the filter press 4 from protruding downward relative to the oil-cooled motor body 1.
[0068] Actual assembly shows that by restricting the position and orientation of the oil pump 3, suction filter 2 and filter press 4, regardless of whether the present application is arranged in the left or right area of the electric drive bridge, the oil pump 3 and other structures do not interfere with other structures in the electric drive bridge. There is no need to replace the oil-cooled motor of the electric drive bridge due to changes in the arrangement position, thus reducing the adjustment cost and structural processing cost of the electric drive bridge (such as the mold cost of the motor housing).
[0069] See Figure 5 In this embodiment, the oil pan 12 has a guide slope 121, and the oil outlet 13 is located in the low-lying area of the guide slope 121. With this arrangement, the oil outlet 13 is located at the lowest point of the guide slope 121, which facilitates the rapid flow of all oil flowing towards the oil pan 12 into the oil pump 3, effectively improving the situation of slow oil pumping or air intake by the oil pump 3, improving the oil pumping efficiency of the oil pump 3, and ensuring the subsequent cooling efficiency and effect.
[0070] When the oil-cooled motor is in use, the oil pan 12 is located at the bottom of the oil-cooled motor body 1 along the radial direction of the motor body 1, and the oil gradually collects in the area above the guide slope 121. For the guide slope 121, here is an example: the guide slope 121 is set at an angle downwards (not limited to the oil-cooled motor body 1 being set horizontally), and it has an upper end and a lower end. The lower end forms a low-lying area, and the oil flows downwards and enters the suction filter 2 through the oil outlet 13.
[0071] See Figure 7 In one embodiment, the oil pump 3 draws oil from the inside of the oil pan 12 through the primary filtration of the suction filter 2, and then the oil pump 3 is cooled in the oil cooler 11 through the pressure filter 4. Then the oil is divided into two parts in a ratio of approximately 5:1. Most of the oil enters the stator cooling oil circuit and is then sprayed down from the front oil drip ring 7 and the rear oil drip ring 8 to cool the windings at both ends of the stator 6. A small amount of oil enters the rotor cooling oil circuit, cools the rotor core and magnets, and is then sprayed out from the rotor end plate to cool the inside of the windings at both ends of the stator 6. Finally, the cooled oil flows back to the inside of the oil pan 12 by gravity for the next round of cooling. This process is repeated to achieve oil circulation and efficient cooling of the motor stator 6 and rotor 5.
[0072] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.
Claims
1. An oil-cooled motor for an electric drive bridge, characterized in that: include: The oil-cooled motor body (1) includes an oil cooler (11) and an oil pan (12). The oil pan (12) is located at the bottom end of the oil-cooled motor body (1) along the radial direction of the oil-cooled motor body (1). The oil pan (12) is provided with an oil outlet (13). A suction filter (2) is located on the side of the oil outlet (13); The oil pump (3) has an oil inlet end and an oil outlet end, the oil inlet end being connected to the suction filter (2). Filter press (4) is connected to the oil outlet end; The axial direction of the oil-cooled motor body (1), the length direction of the suction filter (2), the length direction of the oil pump (3) are parallel to the length direction of the filter press (4).
2. The electric drive bridge oil-cooled motor according to claim 1, characterized in that: Along the axial direction of the oil-cooled motor body (1), the oil pump (3) and the suction filter (2) are arranged side by side and close to each other.
3. The electric drive bridge oil-cooled motor according to claim 1, characterized in that: The suction filter (2), the oil pump (3) and the pressure filter (4) are all located on the radial side of the oil-cooled motor body (1).
4. The electric drive bridge oil-cooled motor according to claim 3, characterized in that: Along the axial direction of the oil-cooled motor body (1), relative to the suction filter (2), the oil pump (3) and the filter press (4), the two ends of the oil-cooled motor body (1) are protruding.
5. The electric drive bridge oil-cooled motor according to claim 3, characterized in that: Along the radial direction of the oil-cooled motor body (1), the filter press (4) is located above the oil pump (3).
6. An oil-cooled electric drive bridge motor according to any one of claims 1-5, characterized in that: The oil pan (12) has a flow guide slope (121), and the oil outlet (13) is located in the low-lying area of the flow guide slope (121).
7. The electric drive bridge oil-cooled motor according to claim 6, characterized in that: The guide slope (121) is set at an angle downward and has an upper end and a lower end, the lower end forming the low-lying area.