Coaxial oil cooling electric drive axle

Abstract

The utility model discloses a coaxial oil cooling electric drive axle which comprises a motor shell and a motor controller, and the motor controller is integrated on the motor shell. According to the coaxial oil cooling electric drive axle, the motor controller is integrated on the motor shell, so that the integration level can be improved.

Description

Technical Field

[0001] This utility model belongs to the field of electric drive bridge technology. Specifically, this utility model relates to a coaxial oil-cooled electric drive bridge. Background Technology

[0002] Automotive electric drive axles are gradually evolving towards higher integration. Increased integration can reduce the number of parts, lighten weight, and lower costs. Current coaxial electric drive axle structures integrate the motor, reducer, and axle; however, further improvements in integration are needed.

[0003] Chinese Patent Application No. 201810795092.5 discloses a coaxial integrated electric drive axle, including a reduction mechanism assembly, a motor assembly, a motor controller, a right brake assembly, and a left brake assembly. The motor controller is located on one side of the motor assembly, and the reduction mechanism assembly is located on one side of both the motor assembly and the motor controller. The left brake assembly and the right brake assembly are respectively connected to the two ends of the reduction mechanism assembly. The center of the motor shaft, the center of the transmission output shaft, and the center of the wheel hub shaft are collinear. The center of gravity of the entire drive system is very small off-center from the shaft center, which can effectively reduce the radial moment and enhance the reliability of the system structure.

[0004] The aim is to provide an improved coaxial oil-cooled electric drive bridge, particularly regarding how to improve integration. Utility Model Content

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a coaxial oil-cooled electric drive bridge, with the purpose of improving integration.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a coaxial oil-cooled electric drive bridge, including a motor housing and a motor controller, wherein the motor controller is integrated on the motor housing.

[0007] The motor housing is provided with a heat exchange chamber, a first water channel and a second water channel. The second water channel is connected to the heat exchange chamber. The first water channel and the second water channel are connected to the inner cavity of the motor controller. The inner cavity of the motor controller is provided with a power module.

[0008] Oil passages are provided on the motor housing, and heat dissipation fins are provided on the motor housing.

[0009] The heat dissipation fins are provided in multiple ways, and all heat dissipation fins are arranged sequentially along the length of the oil passage.

[0010] The coaxial oil-cooled electric drive axle also includes a differential, which includes a housing on which gears are integrated.

[0011] The motor controller is provided with a terminal that is connected to the motor terminal.

[0012] An electronic oil pump is installed on the motor housing.

[0013] An oil filter is installed inside the motor housing.

[0014] The coaxial oil-cooled electric drive bridge of this invention can improve integration by integrating the motor controller on the motor housing. Attached Figure Description

[0015] This manual includes the following figures, which illustrate the following:

[0016] Figure 1 This is a schematic diagram of the structure of the coaxial oil-cooled electric drive bridge of this utility model;

[0017] Figure 2 This is a cross-sectional view of the coaxial oil-cooled electric drive bridge of this utility model;

[0018] Figure 3 This is a partial sectional view of the coaxial oil-cooled electric drive bridge of this utility model;

[0019] Figure 4 This is a schematic diagram of the oil filter arrangement;

[0020] Figure 5 This is a diagram showing the terminal connections;

[0021] Figure 6 This is a schematic diagram of the heat sink fin arrangement;

[0022] Figure 7 This is a schematic diagram of the oil passage layout;

[0023] The diagram is marked as follows:

[0024] 1. Left brake; 2. Left axle tube; 3. Left half-shaft; 4. Motor controller; 5. Electronic oil pump; 6. Reducer; 7. Motor assembly; 8. Right half-shaft; 9. Right axle tube; 10. Right brake; 11. Oil seal; 12. Half-shaft auxiliary support bearing; 13. Motor rear housing; 14. Motor rear bearing; 15. Resolver; 16. Motor housing; 17. Controller cover; 18. Motor stator; 19. Motor rotor; 20. Motor shaft; 21. Motor front shaft 21. Bearing housing; 22. Intermediate shaft bearing; 23. Intermediate shaft assembly; 24. Intermediate shaft bearing; 25. Reducer housing; 26. Differential bearing; 27. Differential bearing; 28. Differential bearing; 29. ​​Differential; 30. Oil seal; 31. Gear; 32. Right differential housing; 33. Terminal; 34. Motor terminal; 35. Cover plate; 36. Heat dissipation fins; 37. Oil passage; 38. First water passage; 39. Second water passage; 40. Heat exchange chamber; 41. Oil filter. Detailed Implementation

[0025] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solution of this utility model, and to facilitate its implementation.

[0026] It should be noted that in the following embodiments, the terms "first" and "second" do not represent an absolute distinction in structure and / or function, nor do they represent the order of execution, but are merely for the convenience of description.

[0027] like Figures 1 to 7 As shown, this utility model provides a coaxial oil-cooled electric drive bridge, including a motor assembly 7, a differential 29, a motor controller 4, a left brake, a left axle tube 2, a left half-shaft 3, an electronic oil pump 5, a reducer 6, a right half-shaft 8, a right axle tube 9, and a right brake. The left half-shaft 3 and the right half-shaft 8 are coaxially arranged and connected to the differential 29. The left half-shaft 3 passes through the left axle tube 2, and the right half-shaft 8 passes through the right axle tube 9. The output end of the motor assembly 7 is connected to the differential 29 through the reducer 6.

[0028] Specifically, such as Figures 1 to 3 As shown, the motor assembly 7 includes a motor housing 16, a motor stator 18, a motor rotor 19, and a motor rear housing. The motor controller 4 is integrated into the motor housing 16. The motor controller 4 is an electronic device used to control the operation of the motor. The motor rear housing is fixedly connected to one end of the motor housing 16. The motor housing 16 is a hollow shell structure, and the motor stator 18 is fixedly disposed inside the motor housing 16.

[0029] like Figure 7 As shown, the motor housing 16 contains a heat exchange chamber 40, a first water channel 38, and a second water channel 39. The second water channel 39 communicates with the heat exchange chamber 40, and the first and second water channels 38 and 39 communicate with the inner cavity of the motor controller 4. A power module is housed within the inner cavity of the motor controller 4. The power module is one of the core components of the motor controller 4, primarily responsible for the conversion, amplification, and control of electrical energy. The power module converts the input electrical energy into the form of electrical energy required by the motor. Coolant enters the inner cavity of the motor controller 4 through the first water channel 38, cools the power module, and then flows into the heat exchange chamber 40 through the second water channel 39, finally exiting. Figure 6 As shown, an oil passage 37 is provided on the motor housing 16. The oil passage 37 and the heat exchange chamber 40 are arranged adjacent to each other. The oil flowing in the oil passage 37 exchanges heat with the coolant flowing in the heat exchange chamber 40. The oil is cooled down by the coolant in the heat exchange chamber 40 and then cools the motor.

[0030] like Figure 6As shown, the motor housing 16 is provided with heat dissipation fins 36, and multiple heat dissipation fins 36 are provided, all of which are arranged sequentially along the length of the oil passage 37. The main function of the heat dissipation fins 36 is to increase the heat dissipation area and improve the heat dissipation efficiency. A cover plate 35 is provided on the motor housing 16, and the cover plate 35 and the heat dissipation fins 36 are located below the motor controller 4.

[0031] like Figure 3 As shown, the differential 29 includes a housing, on which a gear 31 is integrated. The differential 29 also includes a right differential housing 32 and a half-shaft gear. The right differential housing 32 is fixedly connected to the housing, forming a housing assembly surrounding the half-shaft gear. The gear 31 is integrally machined with the housing and serves as the power output component of the reducer 6, i.e., the driven gear for reduction.

[0032] like Figure 5 As shown, the motor controller 4 is provided with a terminal 33, which is connected to the motor terminal 34 and passes through the motor housing 16.

[0033] like Figure 1 and Figure 2 As shown, an electronic oil pump 5 is installed on the motor housing 16, which is used to realize the circulation of oil.

[0034] like Figure 4 As shown, the motor housing 16 is connected to the reducer 6. The reducer 6 includes a reducer housing 26, and an oil filter 41 is installed inside the reducer housing 26. The oil filter 41 filters the oil. The motor housing 16 is located between the rear housing of the motor and the reducer housing 26. The reducer 6 transmits the power of the motor assembly 7 to the differential.

[0035] The coaxial oil-cooled electric drive bridge with the above structure has the following advantages:

[0036] 1) The coaxial oil-cooled electric drive bridge integrates a motor controller 4, which improves the integration level;

[0037] 2) The motor housing 16 is equipped with a heat exchange chamber 40, which eliminates the need for an oil cooler, reduces the number of parts, and lowers weight and cost;

[0038] 3) One housing of the differential is integrated with the gear, improving the level of integration;

[0039] 4) Add an oil pump and oil filter 41 to realize the application of oil-cooled motor;

[0040] 5) Integrating the motor controller 4, motor, oil cooling system, reducer 6 and axle can significantly reduce the number of parts, reduce the weight of the electric drive system, reduce high-voltage wiring harness, and thus reduce costs.

[0041] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A coaxial oil-cooled electric drive bridge, comprising a motor housing and a motor controller, characterized in that: The motor controller is integrated into the motor housing; The motor housing is provided with a heat exchange chamber, a first water channel and a second water channel. The second water channel is connected to the heat exchange chamber. The first water channel and the second water channel are connected to the inner cavity of the motor controller. The inner cavity of the motor controller is provided with a power module.

2. The coaxial oil-cooled electric drive bridge according to claim 1, characterized in that: Oil passages are provided on the motor housing, and heat dissipation fins are provided on the motor housing.

3. The coaxial oil-cooled electric drive bridge according to claim 2, characterized in that: The heat dissipation fins are provided in multiple ways, and all heat dissipation fins are arranged sequentially along the length of the oil passage.

4. The coaxial oil-cooled electric drive bridge according to any one of claims 1 to 3, characterized in that: It also includes a differential, which consists of a housing on which gears are integrated.

5. The coaxial oil-cooled electric drive bridge according to any one of claims 1 to 3, characterized in that: The motor controller is provided with a terminal that is connected to the motor terminal.

6. The coaxial oil-cooled electric drive bridge according to any one of claims 1 to 3, characterized in that: An electronic oil pump is installed on the motor housing.

7. The coaxial oil-cooled electric drive bridge according to any one of claims 1 to 3, characterized in that: The motor housing is connected to the reducer, and an oil filter is installed inside the reducer.

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