Electric drive system

Abstract

The invention discloses an electric drive system which comprises a motor controller, a motor, a speed reducer, an electric control shell, two motor shells and a speed reducer shell, the motor controller is installed in the electric control shell, the two motor shells are symmetrically arranged on the two sides of the speed reducer shell, and the electric control shell is arranged over the speed reducer shell and above the motor shells. The motor shell comprises a first end cover, a main shell and second end covers, the main shell is cylindrical, one side of the main shell is covered with the first end cover, the second end covers are located on the other side of the main shell and integrally formed with the main shell, and the two sides of the speed reducer shell are covered with the two second end covers respectively; the number of the motors and the number of the speed reducers are both two, the motors are installed in a cavity defined by the first end cover and the main shell, the speed reducers are installed in a cavity defined by the second end cover and speed reducer shells, the motor controller comprises two power modules, each power module is correspondingly connected with one motor, and each motor is correspondingly connected with one speed reducer. The LED lamp has the advantages of being compact in structure, easy to maintain and good in heat dissipation performance.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular to an electric drive system. Background Art

[0002] In the field of new energy vehicles, the electric drive system is a key component that supports and installs electric drive parts. Its design and performance have an important impact on the power, energy efficiency and NVH (noise, vibration and harshness) performance of the whole vehicle. The high degree of integration of the electric drive system is an important trend in the current technological development. This integrated design is mainly reflected in the deep integration of multiple key components such as motors, controllers and reducers into a shell to form a "three-in-one" or even more highly integrated electric drive system. This design not only reduces the weight and size of the system, but also significantly improves the power density and overall durability of the electric drive system. At the same time, the highly integrated design also reduces manufacturing costs, improves production efficiency and assembly convenience.

[0003] Although the high degree of integration of electric drive systems brings many advantages, there are also some disadvantages: 1. Heat dissipation: The highly integrated design makes the distance between the components inside the system closer, and the heat generated is more concentrated. This requires the system to have stronger heat dissipation capabilities to ensure normal internal temperature. However, traditional heat dissipation systems may not meet this requirement, and more advanced heat dissipation technology is needed.

[0004] 2. Increased difficulty in maintenance: With a highly integrated design, once a component in the system fails, the entire module may need to be removed for maintenance. This not only increases the difficulty and time cost of maintenance, but may also affect the overall performance of the system. In addition, the highly integrated design makes the internal structure of the system more complex, which also places higher requirements on the professional skills of maintenance personnel.

[0005] Therefore, it is necessary to design an electric drive system with compact structure, easy maintenance and excellent heat dissipation performance. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an electric drive system which has a compact structure, is easy to maintain and has excellent heat dissipation performance.

[0007] The technical solution of the present invention provides an electric drive system, including a motor controller, a motor, a reducer, an electric control housing, a motor housing and a reducer housing, wherein the motor controller is installed in the electric control housing, two motor housings are symmetrically arranged on both sides of the reducer housing, the electric control housing is arranged directly above the reducer housing and above the motor housing, the motor housing includes a first end cover, a main housing and a second end cover, the main housing is cylindrical, the first end cover is covered on one side of the main housing, the second end cover is located on the other side of the main housing and is integrally formed with the main housing, and the two second end covers are respectively covered on both sides of the reducer housing; There are two motors and two reducers. The motor is installed in a cavity surrounded by the first end cover and the main shell, and the reducer is installed in a cavity surrounded by the second end cover and the reducer shell. The motor controller includes two power modules, each power module is connected to one motor, and each motor is connected to one reducer.

[0008] Furthermore, the motor controller further comprises an electronically controlled motor integrated copper busbar, the electronically controlled motor integrated copper busbar comprises a first electronically controlled end, a second electronically controlled end and a motor end, the first electronically controlled end and the second electronically controlled end are respectively connected to one of the power modules, and the motor end passes through the electronically controlled housing and then extends into the reducer housing; An integrated wiring base is installed in the reducer housing, the wiring harness of the motor is connected to the integrated wiring base, and the end of the motor is also connected to the integrated wiring base.

[0009] Furthermore, a wiring cavity is provided in the reducer housing, the integrated wiring seat is installed in the wiring cavity, an electric control box opening is provided on the top surface of the wiring cavity, and a motor box opening is provided on each of the two side surfaces of the wiring cavity; The bottom surface of the electric control housing is provided with an electric control wiring port, and the electric control wiring port is connected to the opening of the electric control box; The second end cover is provided with a motor connection port, the motor connection port leads to the interior of the main housing, and the motor connection port is connected to the motor box opening; The end of the motor passes through the electric control wiring port and is inserted into the electric control box opening. The wiring harness of the motor passes through the motor wiring port and is inserted into the motor box opening.

[0010] Furthermore, the reducer housing comprises an input shaft region, an intermediate shaft region and an output shaft region, and the wiring chamber is arranged above the input shaft region of the reducer housing and is located between the electronic control housing and the two motor housings.

[0011] Furthermore, the integrated wiring seat includes a plurality of wiring boards, a partition is provided between adjacent wiring boards, and the wiring boards include electric control terminals and motor terminals; The motor end includes a plurality of terminals, each of which is connected to a corresponding one of the electric control terminals, and the wiring harness of the motor is connected to the motor terminal.

[0012] Furthermore, the length of each of the wiring boards increases or decreases in sequence, and the length of the partitions also increases or decreases in sequence.

[0013] Furthermore, it also includes an electronically controlled cooling circuit and a motor cooling circuit, the electronically controlled cooling circuit includes a first electronically controlled cooling circuit and a second electronically controlled cooling circuit, the motor cooling circuit includes a first motor cooling circuit and a second motor cooling circuit, the first electronically controlled cooling circuit and the second electronically controlled cooling circuit are both arranged in the electronically controlled housing, the first motor cooling circuit and the second motor cooling circuit are respectively arranged in the two motor housings, the first electronically controlled cooling circuit is connected to the first motor cooling circuit, and the second electronically controlled cooling circuit is connected to the second motor cooling circuit.

[0014] Furthermore, it also includes a main cooling pipeline, which is arranged in the electronic control housing and is connected to the inlets of the first electronic control cooling circuit and the second electronic control cooling circuit respectively. The main cooling pipeline includes an access pipe and a branch pipe. The access pipe is used to connect to an external cooling source. The access pipe is connected to the branch pipe, and the branch pipe is connected to the inlets of the first electronic control cooling circuit and the second electronic control cooling circuit respectively.

[0015] Further, the electric control housing includes a cover plate and a bottom shell; The first electrically controlled cooling circuit and the second electrically controlled cooling circuit both include an input pipe, a cooling groove and an output pipe. The two input pipes are connected to the branch pipe. The input pipe and the output pipe are formed inside the bottom plate of the bottom shell. The cooling groove is opened on the inner side surface of the bottom plate. The two cooling grooves are arranged side by side.

[0016] Furthermore, the first motor cooling circuit and the second motor cooling circuit each include a liquid inlet, a spiral cooling channel and a liquid outlet, the liquid inlet is connected to the output pipe, the spiral cooling channel is arranged inside the main shell, and the liquid inlet and the liquid outlet are arranged on the outer wall of the main shell and are connected to the spiral cooling channel.

[0017] After adopting the above technical solution, the following beneficial effects are achieved: In the present invention, the electric control housing is separately provided, which is convenient for the separate maintenance of the motor controller; at the same time, the motor housing and the reducer housing are integrated in the same axial direction, and the motor housing and the reducer housing share the second end cover, so that the structure in the axial direction is more compact and it is also easy to maintain the motor and the reducer. When the motor needs to be repaired, the first end cover can be disassembled; when the reducer needs to be repaired, the second end cover can be separated from the reducer housing. BRIEF DESCRIPTION OF THE DRAWINGS The disclosure of the present invention will become more easily understood with reference to the accompanying drawings. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the drawings: Figure 1 The electric drive system in one embodiment of the present invention Figure 1 ; Figure 2 is a cross-sectional view of an electric drive system in one embodiment of the present invention; Figure 3 is an exploded view of an electric drive system in one embodiment of the present invention; Figure 4 The integrated copper busbar of the electric motor in one embodiment of the present invention is Figure 1 ; Figure 5 The integrated copper busbar of the electric motor in one embodiment of the present invention is Figure 2 ; Figure 6 is a schematic diagram of the interior of an electric control housing in one embodiment of the present invention; Figure 7 is a three-dimensional diagram of an integrated wiring socket in one embodiment of the present invention; Figure 8 is an exploded view of an electric drive system in one embodiment of the present invention; Fig. 9 is an exploded view of a reducer housing and a motor housing in one embodiment of the present invention; Fig.10 is an exploded view of an electric control housing in one embodiment of the present invention; Fig.11 is an exploded view of a maintenance cover and a reducer housing in one embodiment of the present invention; Fig.12 is a cross-sectional view of a cover plate in one embodiment of the present invention; Fig.13 The electric drive system in one embodiment of the present invention Figure 2 ; Fig.14 The electric drive system in one embodiment of the present invention Figure 3 ; Fig.15 is an exploded view of an electric drive system in one embodiment of the present invention; Fig.16is a schematic diagram of a motor housing and a reducer housing in one embodiment of the present invention; Fig.17 is a schematic diagram of an electric control housing in one embodiment of the present invention; Fig.18 is a schematic diagram of the internal structure of an electric control housing in one embodiment of the present invention; Fig.19 Schematic diagram of an electric control cooling circuit and a motor cooling circuit in one embodiment of the present invention.

[0018] Reference table of reference numerals: The electric control housing 1 includes a cover plate 11, a bottom shell 12, a hexagonal reinforcing rib 13, an electric control wiring port 14, a metal layer 111, a damping material layer 112, a first mounting hole 121, a second mounting hole 122, and a positioning groove 123; Motor housing 2: first end cover 21, main housing 22, second end cover 23, first mounting column 221, motor wiring port 231, reducer bearing mounting position 232, output shaft hole 233; Electronically controlled cooling circuit 3: input pipe 31, cooling tank 32, output pipe 33; Motor cooling circuit 4: liquid inlet 41, spiral cooling channel 42, liquid outlet 43; Cooling main pipeline 5: access pipe 51, branch pipe 52; Reducer housing 6: wiring cavity 61, electric control closing opening 611, motor closing opening 612, maintenance opening 613, maintenance cover 62, second mounting column 63; Motor controller 7: circuit board 71, capacitor 72, power module 73, electric control motor integrated copper bus 74, first electric control end 741, second electric control end 742, motor end 743, positioning column 744; Motor 8: rotor 81, stator 82; Reducer 9: integrated wiring seat 91, wiring board 911, partition 912, base 913, electric control terminal 911a, motor terminal 911b. DETAILED DESCRIPTION

[0019] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0020] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a variety of structural modes and implementation modes that can be replaced by those skilled in the art can be replaced with each other. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the whole of the present invention or as a limitation or restriction to the technical solution of the invention.

[0021] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. They are relative concepts and may change accordingly according to different positions and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0022] In some embodiments of the present invention, Figure 1-Figure 3 As shown, the electric drive system includes a motor controller 7, a motor 8, a reducer 9, an electric control housing 1, a motor housing 2 and a reducer housing 6. The motor controller 7 is installed in the electric control housing 1. The two motor housings 2 are symmetrically arranged on both sides of the reducer housing 6. The electric control housing 1 is arranged directly above the reducer housing 6 and above the motor housing 2. The motor housing 2 includes a first end cover 21, a main housing 22 and a second end cover 23. The main housing 22 is cylindrical. The first end cover 21 is covered on one side of the main housing, and the second end cover 23 is located on the other side of the main housing 22 and is integrally formed with the main housing 22. The two second end covers 23 are respectively covered on both sides of the reducer housing 6. There are two motors 8 and two reducers 9. The motor 8 is installed in the cavity surrounded by the first end cover 21 and the main shell 22, and the reducer 9 is installed in the cavity surrounded by the second end cover 23 and the reducer housing 6. The motor controller 7 includes two power modules 73, each power module 73 is connected to a corresponding motor 8, and each motor 8 is connected to a corresponding reducer 9.

[0023] Specifically, Figure 1 As shown, the electric control housing 1 is arranged directly above the reducer housing 6 and is also located above the two motor housings 2. The electric control housing 1 is arranged independently, which is convenient for separate maintenance of the motor controller 7 installed in the electric control housing 1.

[0024] like Figure 2-Figure 3 As shown, the reducer housing 6 and the two motor housings 2 are coaxially connected, and the motor housing 2 includes a first end cover 21, a main housing 22 and a second end cover 23. The first end cover 21 is located on the outside of the main housing 22, and the second end cover 23 is located between the main housing 22 and the reducer housing 6. The second end cover 23 is integrally formed with the main housing 22, thereby increasing the integration of the housing.

[0025] like Figure 3As shown, the motor 8 is installed in the cavity surrounded by the first end cover 21 and the main shell 22, and the reducer 9 is installed in the cavity surrounded by the second end cover 23 and the reducer housing 6. The second end cover 23 is not only the end cover of the motor housing 2, but also the end cover of the reducer housing 6 when connected to the reducer housing 6, so that the motor housing 2 and the reducer housing 6 are shared, which is conducive to reducing the size in the axial direction, making the structure more compact and occupying less space. At the same time, it is also convenient to maintain. When the motor 8 needs to be repaired, the first end cover 21 can be disassembled; when the reducer 9 needs to be repaired, the second end cover 23 and the reducer housing 6 can be separated.

[0026] Therefore, the electric drive system in this embodiment has the advantages of compact structure and small space occupation, and is easy to maintain.

[0027] In addition, the present embodiment includes two independent electronic control-motor-reducer systems, and the two systems operate independently, wherein the motor controller 7 is integrated in an electronic control housing 1, the two motors 8 are respectively installed in a motor housing 2, and the two reducers 9 are integrated in a reducer housing 6. The present embodiment realizes the symmetrical arrangement of the two electronic control-motor-reducer systems, and the overall structure is more compact and occupies less space.

[0028] Furthermore, if Fig. 9 As shown, a reducer bearing mounting position 232 is provided on one side of the second end cover 23 facing the reducer housing 6, and a motor bearing mounting position (not shown) is provided on the other side facing the main housing 22, and an output shaft hole 233 is provided in the area of ​​the second end cover 23 extending beyond the main housing 22.

[0029] Among them, the reducer bearing installation position 232 is used to install the bearings of the input shaft and the intermediate shaft of the reducer 9, the motor bearing installation position is used to install the bearings of the motor 8, and the output shaft hole 233 is used to install the bearing of the output shaft. After the output shaft extends out of the output shaft hole 233, it is connected to the external wheel shaft.

[0030] The reducer housing 6 is also provided with corresponding mounting positions for the bearings of the input shaft, the intermediate shaft and the output shaft.

[0031] In this embodiment, the cross-sectional area of ​​the reducer housing 6 is larger than the cross-sectional area of ​​the motor housing 2 , so the area of ​​the second end cover 23 is larger than the area of ​​the main housing 22 , and the portion of the second end cover 23 that exceeds the main housing 22 just docks with the reducer 9 .

[0032] Furthermore, if Figure 4-Figure 5As shown, the motor controller 7 also includes an electric control motor integrated copper busbar 74, which includes a first electric control end 741, a second electric control end 742 and a motor end 743, wherein the first electric control end 741 and the second electric control end 742 are respectively connected to a power module 73, and the motor end 743 passes through the electric control housing 1 and then extends into the reducer housing 6; An integrated wiring base 91 is installed in the reducer housing 6 , the wiring harness of the motor 8 is connected to the integrated wiring base 91 , and the motor end 743 is also connected to the integrated wiring base 91 .

[0033] Specifically, Figure 4 As shown, the electric control motor integrated copper bar 74 is a Y-shaped plate, the first electric control end 741 and the second electric control end 742 are arranged side by side, and the first electric control end 741 and the second electric control end 742 are both provided with a plurality of connection terminals. Figure 3 As shown, the first electric control end 741 and the second electric control end 742 are respectively connected to a power module 73 .

[0034] like Figure 5 As shown, the first electric control end 741 and the second electric control end 742 are located in the same plane, the motor end 743 extends vertically downward relative to the first electric control end 741 and the second electric control end 742, and a plurality of terminals are also provided on the motor end 743. The motor end 743 can pass through the electric control housing 1 and then be inserted into the reducer housing 6.

[0035] Preferably, if Figure 5 As shown, the bottom surface of the electric control motor integrated copper bar 74 is also provided with a positioning column 744, and the positioning column 744 is used to be inserted into the positioning groove 123 on the electric control housing 1 (see Figure 6 ), the positioning between the electronic control motor integrated copper bar 74 and the electronic control housing 1 is achieved to prevent the electronic control motor integrated copper bar 74 from moving inside the electronic control housing 1.

[0036] like Figure 3 and Figure 7 As shown, the integrated terminal block 91 is installed in the reducer housing 6, and the motor end 743 is connected to the integrated terminal block 91 after being inserted into the reducer housing 6. At the same time, the wiring harness of the motor 8 is also connected to the integrated terminal block 91 after entering the reducer housing 6, thereby realizing the circuit connection between the motor 8 and the motor controller 7.

[0037] Furthermore, if Figure 7 As shown, the integrated terminal block 91 includes a plurality of terminal blocks 911, a partition 912 is provided between adjacent terminal blocks 911, and the terminal blocks 911 include an electric control terminal 911a and a motor terminal 911b; the integrated terminal block 91 also includes a base 913, the terminal blocks 911 and the partition 912 are both mounted on the base 913, and the base 913 is installed in the reducer housing 6.

[0038] The motor end 743 includes a plurality of terminals, each of which is connected to a corresponding electric control terminal 911a, and the wiring harness of the motor 8 is connected to the motor terminal 911b.

[0039] The integrated wiring seat 91 separates each wiring board 911 through a partition 912 to facilitate the connection and isolation of each terminal.

[0040] Furthermore, if Figure 7 As shown, the length of each wiring board 911 increases or decreases successively, and the length of the partition 912 also increases or decreases successively. The wiring board 911 and the partition 912 are set to have a length that changes successively, which is beneficial to the isolation of each terminal and also convenient for the operation of the staff.

[0041] Furthermore, if Fig. 9 As shown, a wiring cavity 61 is provided in the reducer housing 6, an electric control closing opening 611 is provided on the top surface of the wiring cavity 61, and a motor closing opening 612 is provided on each of the two side surfaces of the wiring cavity 61; like Fig.10 As shown, the bottom surface of the electric control housing 1 is provided with an electric control wiring port 14, and the electric control wiring port 14 is connected to the electric control closing box opening 611; like Fig. 9 As shown, the second end cover 23 is provided with a motor connection port 231, the motor connection port 231 leads to the interior of the main housing 22, and the motor connection port 231 is connected to the motor box opening 612; like Figure 8 As shown, the motor end 743 passes through the electric control wiring port 14 and is inserted into the electric control box opening 611 , and the wiring harness of the motor 8 passes through the motor wiring port 231 and is inserted into the motor box opening 612 .

[0042] Specifically, Fig.10 As shown, an electric control wiring port 14 is provided on the bottom surface of the bottom shell 12 of the electric control housing 1 , and the wiring harness of the motor controller is centrally led out from the electric control wiring port 14 .

[0043] like Fig. 9 As shown, an electric control box opening 611 is provided on the top surface of the wiring cavity 61 . After the wiring harness of the motor controller is led out from the electric control wiring port 14 , it enters the wiring cavity 61 through the electric control box opening 611 .

[0044] like Fig. 9 As shown, the left and right sides of the wiring cavity 61 each have a motor box opening 612, and the second end cover 23 has a motor wiring port 231. Figure 8As shown, the wiring harness of the motor 8 passes through the motor wiring port 231 and then enters the wiring cavity 61 through the motor box opening 612. Therefore, the wiring harness of the motor 8 is connected with the wiring harness of the motor controller in the wiring cavity 61. The setting of the wiring cavity 61 is conducive to the centralized connection of the wiring harness, easy detection and maintenance, and increased integration.

[0045] Preferably, if Fig. 9 As shown, the reducer housing 6 includes an input shaft area, an intermediate shaft area and an output shaft area, and the wiring chamber 61 is arranged above the input shaft area of ​​the reducer housing 6 and located between the electric control housing 1 and the two motor housings 2. The wiring chamber 61 utilizes the space above the input shaft area of ​​the reducer housing 6, which is located just between the two motor housings 2 and below the electric control housing 1, effectively utilizing this narrow space and making the finishing structure more compact.

[0046] Furthermore, if Fig.11 As shown, a maintenance port 613 is provided on the front side of the wiring cavity 61, and a maintenance cover 62 is provided on the maintenance port 613. The maintenance cover 62 is detachably connected to the maintenance port 613. When the wiring harness inside the wiring cavity 61 needs to be inspected, the maintenance cover 62 can be opened from the outside and inspected through the maintenance port 613.

[0047] The arrangement of the wiring chamber 61 in this embodiment not only utilizes the narrow space between the two motor housings 2 and the electronic control housing 1 to centrally connect the wiring harnesses, but also facilitates maintenance and troubleshooting, thereby reducing the difficulty and workload of maintenance.

[0048] Preferably, if Figure 10-11 As shown, the edges of the electric control box opening 611 are on the same plane, and the electric control box opening 611 is fitted with the bottom surface of the electric control housing 1 and sealed by sealant, thereby achieving sealing between the electric control housing 1 and the wiring cavity 61.

[0049] Preferably, if Fig. 9 As shown, the motor box opening 612 is roughly the same shape as the motor wiring port 231, and the edges are all on the same plane. After pasting, it is sealed with sealant to achieve the sealing of the interior of the reducer housing 6 and the motor housing 2 and the wiring cavity 61, preventing the oil in the reducer housing 6 from entering the wiring cavity 61 and the motor housing 2.

[0050] Furthermore, the reducer housing 6 includes a first cavity and a second cavity, the first cavity and the second cavity respectively correspond to a motor housing 2, a reducer 9 is installed in each of the first cavity and the second cavity, and each reducer 9 corresponds to a motor 8.

[0051] Furthermore, it also includes an electronically controlled cooling circuit 3 and a motor cooling circuit 4, the electronically controlled cooling circuit 3 includes a first electronically controlled cooling circuit and a second electronically controlled cooling circuit, the motor cooling circuit 4 includes a first motor cooling circuit and a second motor cooling circuit, the first electronically controlled cooling circuit and the second electronically controlled cooling circuit are both arranged in the electronically controlled housing 1, the first motor cooling circuit and the second motor cooling circuit are respectively arranged in two motor housings 2, the first electronically controlled cooling circuit is connected to the first motor cooling circuit, and the second electronically controlled cooling circuit is connected to the second motor cooling circuit.

[0052] Specifically, Fig.19 As shown, there are two electric control cooling circuits 3, which are arranged symmetrically on the left and right; there are two motor cooling circuits 4, which are also arranged symmetrically on the left and right. The two electric control cooling circuits 3 are both arranged inside an electric control housing 1, and the two motor cooling circuits 4 are respectively arranged inside two motor housings 2, wherein the electric control cooling circuit 3 and the motor cooling circuit 4 on the same side are connected.

[0053] Since the electronically controlled cooling circuit 3 and the motor cooling circuit 4 are both arranged inside the shell, no external pipeline is required for connection, making the overall structure compact and occupying a small space, reducing the heat exchange loss of the external pipeline, shortening the path of the cooling circuit, and improving the cooling efficiency.

[0054] In this embodiment, each motor is provided with a motor cooling circuit, and the two motor cooling circuits operate independently, so the cooling efficiency is higher and the cooling effect is better.

[0055] Furthermore, if Fig.19 As shown, it also includes a cooling main pipeline 5, which is arranged in the electronic control housing 1 and is connected to the inlet of the first electronic control cooling circuit and the inlet of the second electronic control cooling circuit respectively. Fig.13 and Fig.19 As shown, the cooling main pipeline 5 includes an access pipe 51 and a branch pipe 52. The access pipe 51 is used to connect to an external cooling source. The access pipe 51 is connected to the branch pipe 52. The branch pipe 52 is respectively connected to the inlet of the first electronically controlled cooling circuit and the inlet of the second electronically controlled cooling circuit.

[0056] Specifically, Fig.13 As shown, the inlet of the access pipe 51 is opened on the outer side of the electric control housing 1 , and the coolant enters from the access pipe 51 and then flows into the branch pipe 52 .

[0057] like Fig.19As shown, the branch pipe 52 and the access pipe 51 are perpendicular to each other, and the branch pipe 52 runs horizontally through the left and right directions of the electric control housing 1. The middle part of the branch pipe 52 is connected to the access pipe 51, and then the left and right sides are respectively connected to the inlet of the first electric control cooling circuit and the second electric control cooling circuit. Both ends of the branch pipe 52 pass through the left and right sides of the electric control housing 1, and both ends are blocked, so as to facilitate the drilling of the decomposition pipe 52.

[0058] Furthermore, if Fig.14 As shown, the electric control housing 1 includes a cover plate 11 and a bottom shell 12 .

[0059] like Fig.18 and Fig.19 As shown, the first electronically controlled cooling circuit and the second electronically controlled cooling circuit both include an input pipe 31, a cooling groove 32 and an output pipe 33. The two input pipes 31 are connected to the branch pipe 52. The input pipe 31 and the output pipe 33 are formed inside the bottom plate of the bottom shell 12. The cooling groove 32 is opened on the inner side of the bottom plate, and the two cooling grooves 32 are arranged side by side.

[0060] Specifically, Fig.19 As shown, the inlet pipe 31 is communicated with the branch pipe 52 along a direction perpendicular to the branch pipe 52 .

[0061] like Fig.17 As shown, two input pipes 31 are drilled from the side wall of the bottom shell 12 into the interior of the bottom shell 12. When in use, the outer holes of the input pipes 31 are blocked. This arrangement of the input pipes 31 is also convenient for processing.

[0062] like Fig.18 As shown, the cooling groove 32 is opened on the inner side surface of the bottom plate of the bottom shell 12, and the input pipe 31 is connected to one side of the cooling groove 32. After the coolant flows into the cooling groove 32, the power module inserted into the cooling groove 32 is cooled, and then flows out from the output pipe 33 connected to the other side of the cooling groove 32. Fig.18 The two cooling slots 32 are arranged side by side to cool the two power modules arranged in the electronic control housing 1 respectively, and the first electronic control cooling circuit and the second electronic control cooling circuit do not interfere with each other.

[0063] Preferably, if Fig.12 As shown, the cover plate 11 of the electric control housing 1 includes three layers, the upper and lower layers are metal layers 111, and the damping material layer 112 is filled between the two metal layers 111. The damping material layer 112 can effectively reduce the electric control radiation noise and improve the NVH performance.

[0064] Preferably, if Fig.10 As shown, a power module 73 is installed in the electric control housing 1. A plurality of heat sinks are provided on one side of the power module 73. The heat sinks are inserted into the cooling grooves 32. The power module 73 and the edges of the cooling grooves 32 are sealed by sealing rings.

[0065] To facilitate the representation of the connections between cooling circuits, Fig.19 It actually shows the entity of the coolant in the electronic control cooling circuit 3 and the motor cooling circuit 4. Fig.19 The middle cooling slot 32 is actually the shape of the coolant flowing around the plurality of heat sinks in the cooling slot 32 .

[0066] Furthermore, if Fig.16 As shown, the top surface of the main shell 22 of the motor housing 2 is also provided with a first mounting column 221. Fig.17 A first mounting hole 121 is provided at the bottom edge of the bottom shell 12 of the central electronic control housing 1 , and the first mounting column 221 is connected to the first mounting hole 121 along the longitudinal direction by bolts or screws.

[0067] like Fig.16 As shown, a second mounting column 63 is provided on the top of the reducer housing 6. Fig.17 The bottom surface of the bottom shell 12 of the central electronic control housing 1 is further provided with a second mounting hole 122 , and the second mounting column 63 is connected to the second mounting hole 122 in the transverse direction by bolts or screws.

[0068] like Fig.13 As shown, the installation of the electronic control housing 1, the motor housing 2 and the reducer housing 6 is achieved through the cooperation of two groups of mounting columns and mounting holes.

[0069] Furthermore, if Fig.18 As shown, a plurality of hexagonal reinforcing ribs 13 are provided on the inner side surface of the bottom plate of the electronic control housing 1 .

[0070] Specifically, Fig.18 As shown, the hexagonal reinforcement ribs 13 are arranged on the upper part, the middle part and between the two cooling grooves 32 of the inner side surface of the bottom plate. The hexagonal reinforcement ribs 13 can improve the rigidity and strength of the electric control housing 1.

[0071] Furthermore, if Fig.18 As shown, the hexagonal reinforcement ribs 13 and the cooling grooves 32 are connected by the slash reinforcement ribs 14, and the two work together to further improve the rigidity and strength of the electronic control housing 1. Compared with a single honeycomb structure, the process is simpler.

[0072] Furthermore, if Fig.19 As shown, the first motor cooling circuit and the second motor cooling circuit both include a liquid inlet 41, a spiral cooling channel 42 and a liquid outlet 43, the liquid inlet 41 is connected to the output pipe 33, the spiral cooling channel 42 is arranged inside the main shell 22, and the liquid inlet 41 and the liquid outlet 43 are arranged on the outer wall of the main shell 22 and are connected to the spiral cooling channel 42.

[0073] Specifically, Fig.16As shown, the liquid inlet 41 is opened longitudinally into the main shell 22, the spiral cooling channel 42 surrounds the circumference of the main shell 22 to form multiple circles of continuous channels, and the liquid outlet 43 is arranged on the outer wall of the main shell 22, and the liquid outlet 43 is externally connected to a coolant recovery device.

[0074] Furthermore, if Figure 15-17 As shown, the outlet of the output pipe 33 is opened on the bottom surface of the bottom shell 12 , and the liquid inlet 41 is arranged on the top surface of the main shell 22 .

[0075] Since the electric control housing 1 is arranged above the motor housing 2, the outlet of the output pipe 33 is just connected to the liquid inlet 41, and the output pipe 33 and the liquid inlet 41 can be connected by threads and sealed with a rubber ring. No external pipeline is required between the electric control cooling circuit 3 and the motor cooling circuit 4, and all cooling circuits are arranged inside the electric control housing 1 and the motor housing 2, which not only improves the cooling efficiency but also reduces the space occupation.

[0076] In this embodiment, each motor is provided with a motor cooling circuit, and the two motor cooling circuits operate independently, so the cooling efficiency is higher and the cooling effect is better. In addition, the motor cooling circuit and the electric control cooling circuit are both arranged in the motor housing and the electric control housing, and no external cooling pipeline is required, so that the structure is compact, the space occupied is small, and the cooling efficiency is further improved.

[0077] The above description is only the principle and preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this field, several other modifications can be made based on the principle of the present invention, which should also be considered as the protection scope of the present invention.

Claims

1. An electric drive system, comprising a motor controller, a motor, a reducer, an electric control housing, a motor housing and a reducer housing, wherein the motor controller is installed in the electric control housing, characterized in that: The two motor housings are symmetrically arranged on both sides of the reducer housing, the electric control housing is arranged just above the reducer housing and above the motor housing, the motor housing comprises a first end cover, a main housing and a second end cover, the main housing is cylindrical, the first end cover is arranged on one side of the main housing, the second end cover is located on the other side of the main housing and is integrally formed with the main housing, and the two second end covers are respectively arranged on both sides of the reducer housing; There are two motors and two reducers. The motor is installed in a cavity surrounded by the first end cover and the main shell, and the reducer is installed in a cavity surrounded by the second end cover and the reducer shell. The motor controller includes two power modules, each power module is connected to one motor, and each motor is connected to one reducer.

2. The electric drive system according to claim 1, characterized in that: The motor controller further comprises an electronically controlled motor integrated copper busbar, the electronically controlled motor integrated copper busbar comprises a first electronically controlled end, a second electronically controlled end and a motor end, the first electronically controlled end and the second electronically controlled end are respectively connected to one of the power modules, and the motor end passes through the electronically controlled housing and then extends into the reducer housing; An integrated wiring base is installed in the reducer housing, the wiring harness of the motor is connected to the integrated wiring base, and the end of the motor is also connected to the integrated wiring base.

3. The electric drive system according to claim 2, characterized in that: The reducer housing is provided with a wiring cavity, the integrated wiring seat is installed in the wiring cavity, the top surface of the wiring cavity is provided with an electric control box opening, and the two side surfaces of the wiring cavity are respectively provided with a motor box opening; The bottom surface of the electric control housing is provided with an electric control wiring port, and the electric control wiring port is connected to the opening of the electric control box; The second end cover is provided with a motor connection port, the motor connection port leads to the interior of the main housing, and the motor connection port is connected to the motor box opening; The end of the motor passes through the electric control wiring port and is inserted into the electric control box opening. The wiring harness of the motor passes through the motor wiring port and is inserted into the motor box opening.

4. The electric drive system according to claim 3, characterized in that: The reducer housing comprises an input shaft region, an intermediate shaft region and an output shaft region. The wiring chamber is arranged above the input shaft region of the reducer housing and is located between the electric control housing and the two motor housings.

5. The electric drive system according to claim 2, characterized in that: The integrated wiring seat includes a plurality of wiring boards, and a partition is provided between adjacent wiring boards, and the wiring board includes an electric control terminal and a motor terminal; The motor end includes a plurality of terminals, each of which is connected to a corresponding one of the electric control terminals, and the wiring harness of the motor is connected to the motor terminal.

6. The electric drive system according to claim 6, characterized in that: The length of each of the wiring boards increases or decreases in sequence, and the length of the partitions also increases or decreases in sequence.

7. The electric drive system according to claim 1, characterized in that: It also includes an electronically controlled cooling circuit and a motor cooling circuit, the electronically controlled cooling circuit includes a first electronically controlled cooling circuit and a second electronically controlled cooling circuit, the motor cooling circuit includes a first motor cooling circuit and a second motor cooling circuit, the first electronically controlled cooling circuit and the second electronically controlled cooling circuit are both arranged in the electronically controlled housing, the first motor cooling circuit and the second motor cooling circuit are respectively arranged in the two motor housings, the first electronically controlled cooling circuit is connected to the first motor cooling circuit, and the second electronically controlled cooling circuit is connected to the second motor cooling circuit.

8. The electric drive system according to claim 7, characterized in that: It also includes a main cooling pipeline, which is arranged in the electronic control housing and is connected to the inlets of the first electronic control cooling circuit and the second electronic control cooling circuit respectively. The main cooling pipeline includes an access pipe and a branch pipe. The access pipe is used to connect to an external cooling source. The access pipe is connected to the branch pipe, and the branch pipe is connected to the inlets of the first electronic control cooling circuit and the second electronic control cooling circuit respectively.

9. The electric drive system according to claim 8, characterized in that: The electric control housing comprises a cover plate and a bottom shell; The first electrically controlled cooling circuit and the second electrically controlled cooling circuit both include an input pipe, a cooling groove and an output pipe. The two input pipes are connected to the branch pipe. The input pipe and the output pipe are formed inside the bottom plate of the bottom shell. The cooling groove is opened on the inner side surface of the bottom plate. The two cooling grooves are arranged side by side.

10. The electric drive system according to claim 7, characterized in that: The first motor cooling circuit and the second motor cooling circuit both include a liquid inlet, a spiral cooling channel and a liquid outlet, the liquid inlet is connected to the output pipe, the spiral cooling channel is arranged inside the main shell, and the liquid inlet and the liquid outlet are arranged on the outer wall of the main shell and are connected to the spiral cooling channel.

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