Bearing lubrication oil guide structure of oil cooling electric drive assembly

Abstract

The utility model discloses a bearing lubrication oil guide structure of an oil cooling electric drive assembly. The bearing lubrication oil guide structure comprises a motor shell, a primary filter, an oil pump, a secondary filter, an oil cooler, a control valve, an oil guide pipe and an end cover, the bearing is arranged in the motor shell and is close to the end cover; an oil duct is arranged in the motor shell so that the first-stage filter, the oil pump, the second-stage filter, the oil cooler, the control valve and the oil guide pipe can be sequentially communicated, and the control valve is used for controlling connection and disconnection of the oil cooler and the oil guide pipe. And a fourth oil duct is formed in the end cover and communicates with the oil guide pipe and the bearing, so that the lubricating oil is conveyed into the bearing. The utility model has the characteristics of compact structure, convenience in disassembly and assembly, accurate control of lubricating oil quantity and the like, solves the problems of low lubricating oil flow and insufficient bearing lubrication under the working condition of high rotating speed of the driving motor of the low-oil-quantity dual-motor driving assembly, improves the bearing capacity of the bearing, prolongs the service life of the bearing, and reduces the production cost. The service life of the pure oil cooling electric drive assembly is further prolonged, and the NVH performance is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric drive assemblies, in particular to an oil-cooled electric drive assembly bearing lubrication and oil guide structure. Background Art

[0002] With the rapid development of new energy vehicles, the performance requirements for electric drive assemblies are becoming increasingly stringent. To meet the high torque, high speed, and high efficiency performance requirements of electric drive assemblies, the trend is towards low-viscosity, low-oil-volume lubricants. Low-viscosity and low-oil-volume lubricant solutions pose numerous challenges, such as higher operating temperatures for bearings and reduced protection due to a thinner dynamic oil film. These challenges also pose new challenges to bearing protection and heat dissipation. Bearing failure can have serious consequences, impacting the service life and reliability of electric drive assembly products and causing NVH issues. Furthermore, impurities generated by bearing wear and damage can severely impact the cleanliness of the oil in the electric drive assembly, thereby impacting the service life and reliability of other key components of the electric drive (motor, oil seals, gears). This can damage the electric drive assembly at best, and even more seriously, the entire vehicle, leading to safety accidents and potentially impacting personal safety. Therefore, the need to address bearing life becomes even more pressing, and the type of bearing lubrication structure is crucial.

[0003] The bearings are installed in the bearing holes of the housing, creating a relatively closed lubrication environment. The amount of lubricating oil entering the bearings is relatively small. Furthermore, the close gap between the bearings and the stator makes the design of a bearing lubrication structure difficult. Existing oil-cooled motor technology primarily focuses on cooling the stator and rotor. Bearing lubrication typically relies on splash lubrication and structural gravity lubrication, resulting in poor cooling performance. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide an oil-cooled electric drive assembly bearing lubrication oil guide structure with compact structure, convenient disassembly and assembly, and precise control of lubricating oil quantity, in order to solve the problem of poor bearing lubrication effect in existing oil-cooled electric drive assemblies.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] An oil-cooled electric drive assembly bearing lubrication and oil guide structure includes: a motor housing, a primary filter, an oil pump, a secondary filter, an oil cooler, a control valve, an oil guide pipe and an end cover; the bearing is arranged in the motor housing and close to the end cover; an oil channel is provided in the motor housing to achieve sequential communication between the primary filter, the oil pump, the secondary filter, the oil cooler, the control valve and the oil guide pipe, and the control valve is used to control the connection and disconnection of the oil cooler and the oil guide pipe; a fourth oil channel is provided in the end cover, and the fourth oil channel is respectively connected to the oil guide pipe and the bearing to achieve the delivery of lubricating oil to the inside of the bearing.

[0007] As a further improvement of the present invention, the oil passage in the motor housing includes a first oil passage, and the first oil passage is used to connect the oil pump and the secondary filter.

[0008] As a further improvement of the present invention, the oil passage in the motor housing includes a second oil passage, and the second oil passage is used to connect the secondary filter and the oil cooler.

[0009] As a further improvement of the present invention, the oil channel in the motor housing includes a third oil channel, one end of the third oil channel is connected to the outlet of the oil cooler, the middle of the third oil channel is connected to the inlet of the control valve, and the other end of the third oil channel extends to the edge of the motor housing and is provided with a removable process plug.

[0010] As a further improvement of the present invention, the middle part of the fourth oil channel is connected to the outlet of the oil guide pipe, one end of the fourth oil channel extends along the end cover to the side of the bearing, the other end of the fourth oil channel extends to the edge of the end cover, and is provided with a detachable process plug.

[0011] As a further improvement of the present invention, the control valve is a solenoid valve.

[0012] As a further improvement of the present invention, the primary filter is located inside the motor housing, and the secondary filter is located outside the motor housing.

[0013] Compared with the prior art, the advantages of the present invention are:

[0014] The oil-cooled electric drive assembly bearing lubrication oil guide structure of the utility model realizes the sequential connection of the first-stage filter, oil pump, second-stage filter, oil cooler, control valve and oil guide pipe by providing an oil channel in the motor housing, and utilizes the control valve to control the on-off of the oil cooler and the oil guide pipe, so that lubricating oil can be delivered as needed, and has the characteristics of compact structure, convenient disassembly and assembly, and precise control of lubricating oil quantity. At the same time, a fourth oil channel is provided in the end cover, and the fourth oil channel is respectively connected to the oil guide pipe and the bearing, so that the lubricating oil is delivered to the inside of the bearing, and the bearing is actively and forcibly lubricated, so that the lubricating oil can fully lubricate the bearing and form an effective protective dynamic oil film. In addition, the oil can fully filter out impurities through the filter, thereby avoiding fatigue life and NVH problems caused by damage such as bearing wear. Furthermore, a control valve is set in the oil guide structure based on the characteristics of the dual-motor electric drive assembly to control the lubrication of the oil circuit under different working conditions of the electric drive. This solves the problems of low lubricating oil flow and insufficient bearing lubrication under high-speed working conditions of the low-oil dual-motor drive assembly, improves the bearing load-bearing capacity, extends the bearing life, and further improves the life and NVH performance of the pure oil-cooled electric drive assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1This is a schematic diagram of the principle of the oil-cooled electric drive assembly bearing lubrication and oil guide structure in a specific embodiment of the present utility model; the red arrows in the figure indicate the flow path of the lubricating oil;

[0016] Figure 2 This is one of the partial structural principle diagrams of the oil-cooled electric drive assembly bearing lubrication and oil guide structure in a specific embodiment of the present utility model;

[0017] Figure 3 This is the second schematic diagram of the partial structural principle of the oil-cooled electric drive assembly bearing lubrication and oil guide structure in a specific embodiment of the present utility model;

[0018] Figure 4 This is the third schematic diagram of the partial structural principle of the oil-cooled electric drive assembly bearing lubrication and oil guide structure in a specific embodiment of the present utility model;

[0019] Figure 5 This is a schematic diagram of the flow path of lubricating oil in a specific embodiment of the present utility model;

[0020] Legend: 1. Motor housing; 2. Primary filter; 3. Oil pump; 4. Secondary filter; 5. Oil cooler; 6. Control valve; 7. Oil guide pipe; 8. End cover; 9. Bearing; 10. First oil channel; 11. Second oil channel; 12. Third oil channel; 13. Process plug; 14. Fourth oil channel. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but the scope of protection of the present invention is not limited thereby.

[0022] In the description of the present invention, it should be understood that the terms "side", "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0024] Example

[0025] like Figures 1 to 4 As shown, the oil-cooled electric drive assembly bearing lubrication and oil guide structure of the present invention includes: a motor housing 1, a primary filter 2, an oil pump 3, a secondary filter 4, an oil cooler 5, a control valve 6, an oil guide pipe 7, and an end cover 8. A bearing 9 is disposed in the motor housing 1, connected to the rotating shaft of the motor rotor, and adjacent to the end cover 8. An oil passage is provided in the motor housing 1 to sequentially connect the primary filter 2, the oil pump 3, the secondary filter 4, the oil cooler 5, the control valve 6, and the oil guide pipe 7. The control valve 6 is used to control the connection and disconnection between the oil cooler 5 and the oil guide pipe 7. A fourth oil passage 14 is provided in the end cover 8, which connects the oil guide pipe 7 and the bearing 9, respectively, to ensure that lubricating oil is delivered to the interior of the bearing 9. This embodiment utilizes a design concept that connects the lubricating oil between the motor's stator and rotor and the reducer. By designing oil passages, filters, an oil cooler 5, a control valve 6, and an oil guide pipe 7 within the motor housing 1, lubricating oil is forcibly injected into the motor's bearings 9. This solves the difficult issues of insufficient bearing lubrication and short bearing life in the high-torque, high-speed, and low-viscosity pure oil-cooled electric drive assembly operating environment. By integrating the main oil circuits into the motor housing 1, the use of related components such as oil pipes is reduced, effectively reducing costs.

[0026] Specifically, control valve 6 is a solenoid valve, featuring easy assembly and disassembly and precise control. The solenoid valve controls the oil circuit's closure, opening and closing the lubrication oil circuits for bearings in different positions, and adjusting the oil flow rate for different vehicle operating conditions. For example, when the two motors are operating simultaneously, closing the oil circuit for the inactive motor increases the flow rate for the active motor, ensuring adequate lubrication of bearing 9. This solves the problem of low oil flow and insufficient lubrication of bearing 9 under high-speed operating conditions in a low-oil-volume dual-motor drive assembly.

[0027] In this embodiment, by providing an oil passage in the motor housing 1, the primary filter 2, oil pump 3, secondary filter 4, oil cooler 5, control valve 6, and oil conduit 7 are sequentially connected. The control valve 6 controls the connection between the oil cooler 5 and the oil conduit 7, allowing lubricating oil to be delivered as needed. This results in a compact structure, easy assembly and disassembly, and precise control of the lubricating oil quantity. Furthermore, a fourth oil passage 14 is provided in the end cap 8, connecting the oil conduit 7 and the bearing 9. This allows lubricating oil to be delivered to the interior of the bearing 9, providing active and forced lubrication of the bearing 9. This ensures that the lubricating oil fully lubricates the bearing 9, forming an effective protective dynamic oil film. Furthermore, the oil undergoes secondary filtration through the primary filter 2 and secondary filter 4, effectively filtering out impurities and thus avoiding fatigue life and NVH issues caused by bearing wear and other damage. Furthermore, a control valve 6 is provided in the oil guide structure according to the characteristics of the dual-motor electric drive assembly to control the lubrication of the oil circuit under different working conditions of the electric drive, thereby solving the problems of low lubricating oil flow and insufficient lubrication of bearing 9 under high-speed working conditions of the low-oil dual-motor drive assembly, improving the load-bearing capacity of bearing 9, extending the service life of bearing 9, and further improving the service life and NVH performance of the pure oil-cooled electric drive assembly.

[0028] like Figure 2 As shown, the oil passages in the motor housing 1 include a first oil passage 10, which connects the oil pump 3 and the secondary filter 4. The primary filter 2 is located inside the motor housing 1, and the secondary filter 4 is located outside the motor housing 1. Lubricating oil collected inside the motor housing 1 enters the oil pump 3 through the primary filter 2 and is then transported to the secondary filter 4 through the first oil passage 10. The secondary filtration of the lubricating oil by the primary filter 2 and the secondary filter 4 effectively removes impurities from the lubricating oil, thereby effectively reducing abnormal wear and failure of the bearings caused by impurities and extending bearing life.

[0029] like Figure 3 As shown, the oil passage in the motor housing 1 includes a second oil passage 11 , and the second oil passage 11 is used to connect the secondary filter 4 and the oil cooler 5 .

[0030] like Figure 3 As shown, the oil passages in the motor housing 1 include a third oil passage 12. One end of the third oil passage 12 is connected to the outlet of the oil cooler 5, and the middle portion of the third oil passage 12 is connected to the inlet of the control valve 6. The other end of the third oil passage 12 extends to the edge of the motor housing 1 and is provided with a removable process plug 13. Opening the process plug 13 allows the lubricating oil in the third oil passage 12 to be discharged from the motor housing 1.

[0031] like Figure 4As shown, the middle portion of the fourth oil passage 14 is connected to the outlet of the oil guide pipe 7. One end of the fourth oil passage 14 extends along the end cover 8 to the side of the bearing 9, and the other end of the fourth oil passage 14 extends to the edge of the end cover 8. A removable process plug 13 is provided. Opening the process plug 13 allows the lubricating oil in the fourth oil passage 14 to be discharged from the motor housing 1.

[0032] like Figure 5 As shown, when the oil pump 3 is working, the lubricating oil gathered at the bottom of the motor housing 1 is filtered through the primary filter 2 and reaches the oil pump cavity. The oil pump 3 then sends the lubricating oil to the secondary filter 4 through the first oil channel 10. The lubricating oil after secondary filtration by the secondary filter 4 flows into the oil cooler 5 through the second oil channel 11. After the lubricating oil is cooled in the oil cooler 5, it is introduced into the oil channel where the control valve 6 is located through the third oil channel 12. The control valve 6 is opened according to the working conditions. At this time, the oil channel leading to the oil guide pipe 7 is opened. After passing through the oil guide pipe 7, the lubricating oil is first sprayed to lubricate the motor stator and rotor, and then sprayed into the fourth oil channel 14 in the end cover 8 through the bottom oil hole. Relying on the fourth oil channel 14, the lubricating oil can be directly sent to the bearing 9 of the motor, thereby increasing the lubrication effect of the bearing 9 and extending the service life of the bearing 9.

[0033] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, certain improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An oil-cooled electric drive assembly bearing lubrication oil guide structure, characterized in that: include: A motor housing (1), a primary filter (2), an oil pump (3), a secondary filter (4), an oil cooler (5), a control valve (6), an oil guide pipe (7) and an end cover (8); a bearing (9) is arranged in the motor housing (1) and close to the end cover (8); an oil passage is provided in the motor housing (1) to enable the primary filter (2), the oil pump (3), the secondary filter (4), the oil cooler (5), the control valve (6) and the oil guide pipe (7) to be connected in sequence, and the control valve (6) is used to control the connection and disconnection of the oil cooler (5) and the oil guide pipe (7); a fourth oil passage (14) is provided in the end cover (8), and the fourth oil passage (14) is connected to the oil guide pipe (7) and the bearing (9) respectively, so as to enable the lubricating oil to be transported to the inside of the bearing (9).

2. The oil-cooled electric drive assembly bearing lubrication and oil guide structure according to claim 1 is characterized in that: The oil passage in the motor housing (1) comprises a first oil passage (10), and the first oil passage (10) is used to connect the oil pump (3) and the secondary filter (4).

3. The oil-cooled electric drive assembly bearing lubrication and oil guide structure according to claim 2 is characterized in that: The oil passage in the motor housing (1) includes a second oil passage (11), and the second oil passage (11) is used to connect the secondary filter (4) and the oil cooler (5).

4. The oil-cooled electric drive assembly bearing lubrication and oil guide structure according to claim 3 is characterized in that: The oil passage in the motor housing (1) includes a third oil passage (12), one end of the third oil passage (12) is connected to the outlet of the oil cooler (5), the middle of the third oil passage (12) is connected to the inlet of the control valve (6), and the other end of the third oil passage (12) extends to the edge of the motor housing (1) and is provided with a detachable process plug (13).

5. The oil-cooled electric drive assembly bearing lubrication and oil guide structure according to any one of claims 1 to 4, characterized in that: The middle portion of the fourth oil passage (14) is connected to the outlet of the oil guide pipe (7), one end of the fourth oil passage (14) extends along the end cover (8) to the side of the bearing (9), and the other end of the fourth oil passage (14) extends to the edge of the end cover (8) and is provided with a detachable process plug (13).

6. The oil-cooled electric drive assembly bearing lubrication and oil guide structure according to any one of claims 1 to 4, characterized in that: The control valve (6) is a solenoid valve.

7. The oil-cooled electric drive assembly bearing lubrication and oil guide structure according to any one of claims 1 to 4, characterized in that: The primary filter (2) is located inside the motor housing (1), and the secondary filter (4) is located outside the motor housing (1).

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