Integrated coaxial electric driving system

Abstract

The utility model relates to an integrated coaxial electric driving system, which comprises an integrated shell, a first motor, a second motor and a third motor, and is characterized in that the integrated shell is provided with a first cavity for mounting a planet row speed reducer, a second cavity for mounting a motor and a third cavity for mounting a controller; the first end cover and the second end cover are connected to the two ends of the integrated shell in the axial direction of the motor, a differential mechanism is installed in the first end cover, and the motor, the planet row speed reducer and the differential mechanism are coaxially arranged. The integrated shell is provided with the first cavity used for installing the planet row speed reducer, the second cavity used for installing the motor and the third cavity used for installing the controller, so that the integration level of the electric driving system is effectively improved. Moreover, the planet row speed reducer and the differential mechanism which are coaxially arranged with the motor are adopted, so that the radial size of the electric driving system is effectively reduced, the whole structure is more compact, the weight is reduced, the occupied space is reduced, and the arrangement of the whole vehicle is more facilitated.

Description

Technical Field

[0001] This utility model relates to the field of power device technology for new energy vehicles, and in particular to an integrated coaxial electric drive system. Background Technology

[0002] The electric drive system is the power system of an electric vehicle, used to propel the vehicle. An electric drive system generally consists of three parts: a motor, a reducer, and a motor controller. During operation, the motor controller inverts the direct current (DC) supplied by the battery into three-phase alternating current (AC) to power the motor. The motor then converts this three-phase electrical energy into the mechanical energy of its rotor through electromagnetic interaction. The reducer, using a suitable speed ratio, converts this mechanical energy into the appropriate speed and torque required to drive the vehicle.

[0003] Currently, most mainstream electric drive systems are designed with the three parts separate, assembled individually or in parts, and then mechanically assembled into a whole using bolts. Furthermore, existing electric drive systems typically use a parallel-axis design, which results in a large size, encroaches on vehicle interior space, and is inconvenient for overall vehicle layout. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide an integrated coaxial electric drive system to solve the problems of low integration of existing electric drive systems and the large size, encroachment on vehicle interior space, and inconvenience of vehicle layout caused by the use of parallel shaft electric drive systems.

[0005] To achieve the above and other related objectives, this utility model provides an integrated coaxial electric drive system, comprising:

[0006] An integrated housing has a first end and a second end facing away from each other. A first cavity and a second cavity are arranged side by side and connected along the direction from the first end to the second end inside the integrated housing. A planetary gear reducer is installed in the first cavity and a motor is installed in the second cavity. The planetary gear reducer and the motor are coaxially arranged.

[0007] The integrated housing is provided with a third cavity, which is used to install the controller;

[0008] A first end cap is connected to the first end of the integrated housing. A differential is installed inside the first end cap. The differential is connected to the planetary gear reducer and is coaxially arranged.

[0009] The second end cap is connected to the second end of the integrated housing.

[0010] Optionally, the rotor output shaft of the motor is a hollow shaft, and the planetary gear reducer includes a sun gear, a first planet gear, a planet carrier, and a ring gear. The first planet gear meshes with the sun gear and the ring gear respectively. The sun gear is connected to the rotor output end of the rotor output shaft and is coaxially arranged. The planet carrier is connected to the differential.

[0011] Optionally, the differential includes a differential housing, a second planetary gear, a first half-shaft gear, and a second half-shaft gear. The differential housing is connected to the planetary carrier, and the second planetary gear is connected to the differential housing. The first half-shaft gear and the second half-shaft gear mesh with the second planetary gear. A first drive shaft is connected to the first half-shaft gear and is rotatably supported on the first end cover. A second drive shaft is connected to the second half-shaft gear, passes through the rotor output shaft, and is rotatably supported on the second end cover. The first drive shaft, the second drive shaft, and the rotor output shaft are coaxial.

[0012] Optionally, the third cavity is located outside the first cavity along the radial direction of the motor.

[0013] Optionally, the integrated housing is provided with a partition separating the first cavity and the second cavity, and the planetary carrier is mounted on the partition via a first bearing.

[0014] Optionally, the differential housing includes a first half-shell and a second half-shell, the first half-shell being an integral structure with the planetary carrier, the first drive shaft being mounted on the second half-shell, and the second half-shell being supported on the first end cover by a second bearing.

[0015] Optionally, the first end cover is provided with a bracket for mounting an air compressor, and the bracket is integrally formed with the first end cover.

[0016] Optionally, a reinforcing rib is provided between the first end cap and the bracket.

[0017] Optionally, the second end cap is provided with a high-voltage line interface, which is integrally formed with the second end cap;

[0018] The second end cap is provided with a vent plug at the high-voltage line interface, and the high-voltage line interface is provided with an oil-blocking structure to prevent oil from contaminating the vent plug.

[0019] Optionally, the high-voltage line interface is provided with a reverse draft angle, which is inclined toward the second cavity.

[0020] Optionally, the integrated housing is further provided with an oil pump cavity, an oil filter cavity, a thermostat valve cavity, and a heat exchanger cavity. An oil pump is installed in the oil pump cavity, a filter is installed in the oil filter cavity, a thermostat valve is installed in the thermostat valve cavity, and a heat exchanger is installed in the heat exchanger cavity.

[0021] As described above, this utility model has the following beneficial effects: By providing a first cavity for mounting the planetary gear reducer, a second cavity for mounting the motor, and a third cavity for mounting the controller on the integrated housing, the integration of the electric drive system is effectively improved. The use of a planetary gear reducer and differential arranged coaxially with the motor makes the power transmission path more direct, reducing energy loss during transmission; furthermore, the vibration and noise propagation paths are shortened, resulting in relatively low vibration and noise levels in the overall electric drive system. This application effectively reduces the radial dimension of the electric drive system, making the overall structure more compact and reducing space occupation, which is more conducive to vehicle layout. Attached Figure Description

[0022] Figure 1 The diagram shown is a cross-sectional view of an integrated coaxial electric drive system as illustrated in an embodiment of this application.

[0023] Figure 2 The diagram shown is a schematic representation of the integrated housing structure of an integrated coaxial electric drive system according to an embodiment of this application.

[0024] Figure 3 Displayed as Figure 2 A schematic cross-sectional view of the integrated housing is shown in the figure.

[0025] Figure 4 The diagram shown is a first-view structural schematic of the first end cover of the integrated coaxial electric drive system as illustrated in an embodiment of this application.

[0026] Figure 5 The diagram shown is a second-view structural schematic of the first end cap of the integrated coaxial electric drive system as illustrated in an embodiment of this application.

[0027] Figure 6 The diagram shown is a schematic representation of the second end cap structure of an integrated coaxial electric drive system according to an embodiment of this application.

[0028] Explanation of reference numerals in the attached figures

[0029] Integrated housing 1, first end 101, second end 102, first cavity 103, second cavity 104, third cavity 105, partition 106, second shaft hole 106a, oil pump cavity 107, oil filter cavity 108, thermostatic valve cavity 109, heat exchanger cavity 110, planetary gear reducer 2, sun gear 201, first planet gear 202, large planet gear 202a, small planet gear 202b, planet carrier 203, gear ring 204, motor 3, stator 301, rotor 302, rotor output end 302a, rotor free end 302b, and so on. 4. End cap, 401. Bracket, 402. Reinforcing rib, 403. First shaft hole, 5. Differential, 501. Differential housing, 501a. First half-shell, 501b. Second planetary gear, 502. First half-shaft gear, 503. First drive shaft, 503a. Second half-shaft gear, 504. Second drive shaft, 504a. Second end cap, 6. High-voltage line interface, 601. Breather plug, 602. Oil baffle structure, 603. Reverse draft angle, 604. Third shaft hole, 605. First bearing, 7. Second bearing, 8. Third bearing, 9. Fourth bearing, 10. Fifth bearing, 11. Detailed Implementation

[0030] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0031] Please see Figures 1 to 6 It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this utility model. Therefore, the drawings only show components relevant to this utility model and are not drawn according to the actual number, shape, and size of the components in implementation. In actual implementation, the form, quantity, and proportion of each component can be arbitrarily changed, and the component layout may be more complex. The structures, proportions, and sizes shown in the accompanying drawings are only for illustrative purposes and to assist those skilled in the art in understanding and reading the content disclosed in the specification. They are not intended to limit the implementation conditions of this utility model and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives of this utility model, should still fall within the scope of the technical content disclosed in this utility model. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in this specification are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as within the scope of implementation of this utility model.

[0032] Before describing the embodiments of this utility model in detail, the application environment of this utility model will be described first. The technology of this utility model is mainly applied to the field of new energy vehicle power device technology. This utility model is used to solve the problems of low integration of existing electric drive systems and the use of parallel shaft electric drive systems, which result in large size, encroachment on vehicle interior space, and inconvenience for overall vehicle layout.

[0033] Please combine Figures 1 to 6 As shown, this utility model provides an integrated coaxial electric drive system.

[0034] In one exemplary embodiment of this application, the integrated coaxial electric drive system includes:

[0035] The integrated housing 1 has a first end 101 and a second end 102 facing away from each other. A first cavity 103 and a second cavity 104 are arranged side by side and connected along the direction from the first end 101 to the second end 102 inside the integrated housing 1. A planetary gear reducer 2 is installed in the first cavity 103 and a motor 3 is installed in the second cavity 104. The planetary gear reducer 2 and the motor 3 are arranged coaxially.

[0036] The integrated housing 1 is provided with a third cavity 105, which is used to install the controller;

[0037] The first end cover 4 is connected to the first end 101 of the integrated housing 1. A differential 5 is installed inside the first end cover 4. The differential 5 is connected to the planetary gear reducer 2 and is coaxially arranged.

[0038] The second end cap 6 is connected to the second end 102 of the integrated housing 1.

[0039] In this embodiment, by providing a first cavity 103 for mounting the planetary gear reducer 2, a second cavity 104 for mounting the motor 3, and a third cavity 105 for mounting the controller on the integrated housing 1, the integration of the electric drive system is effectively improved. Furthermore, by employing the planetary gear reducer 2 and differential 5 arranged coaxially with the motor 3, the power transmission path is more direct, reducing energy loss during transmission. The vibration and noise propagation paths of the planetary gear reducer 2 and differential 5 arranged coaxially with the motor 3 are relatively short, and due to the high integration of components, the overall vibration and noise levels of the electric drive system are relatively low. This application effectively reduces the radial dimension of the electric drive system, making the overall structure more compact, reducing weight, and decreasing space occupation, which is more conducive to vehicle layout.

[0040] It is worth noting that the motor 3 includes a stator 301 and a rotor 302. The motor 3 includes, but is not limited to, an AC asynchronous motor 3. The motor 3 shown in the embodiments of this application is an AC asynchronous motor 3, and the output shaft of the motor 3 is a hollow shaft. By using an AC asynchronous motor 3, compared with a permanent magnet synchronous motor 3, the AC asynchronous motor 3 can greatly reduce the loss of the electric drive system when the motor 3 is not working, and effectively improve the range of the whole vehicle.

[0041] In an exemplary embodiment of this application, the output shaft of the rotor 302 of the motor 3 is a hollow shaft, and the planetary gear reducer 2 includes a sun gear 201, a first planet gear 202, a planet carrier 203 and a ring gear 204. The first planet gear 202 meshes with the sun gear 201 and the ring gear 204 respectively. The sun gear 201 is connected to the rotor output end 302a of the output shaft of the rotor 302 and is coaxially arranged. The planet carrier 203 is connected to the differential 5.

[0042] In this embodiment, a first shaft hole 403 is provided on the first end cover 4, a second shaft hole 106a is provided on the integrated housing 1, and a third shaft hole 605 is provided on the second end cover 6. The first shaft hole 403, the second shaft hole 106a, and the third shaft hole 605 are coaxially arranged. The gear ring 204 is integrated into the first end cover 4. The rotor output end 302a passes through the second shaft hole 106a and is connected to the planetary gear reducer 2 in the first cavity 103 through the sun gear 201 integrated on the rotor output end 302a. The first planet gear 202 includes an integrally formed large planet gear 202a and a small planet gear 202b. The first planet gear 202 is rotatably connected to the planet carrier 203 through needle roller bearings. The large planet gear 202a meshes with the sun gear 201, and the small planet gear 202b meshes with the gear ring 204. The rotor free end 302b protrudes from the first cavity 103 and is rotatably connected to the third shaft hole 605 of the second end cover 6.

[0043] In an exemplary embodiment of this application, the differential 5 includes a differential housing 501, a second planetary gear 502, a first half-shaft gear 503, and a second half-shaft gear 504. The differential housing 501 is connected to the planet carrier 203, and the second planetary gear 502 is connected to the differential housing 501. The first half-shaft gear 503 and the second half-shaft gear 504 mesh with the second planetary gear 502 respectively. A first drive shaft 503a is connected to the first half-shaft gear 503, and the first drive shaft 503a is rotatably supported on the first end cover 4. A second drive shaft 504a is connected to the second half-shaft gear 504, and the second drive shaft 504a passes through the output shaft of the rotor 302 and is rotatably supported on the second end cover 6. The first drive shaft 503a, the second drive shaft 504a, and the output shaft of the rotor 302 are coaxial.

[0044] In this embodiment, the second planetary gear 502 is connected to the differential housing 501 via a slotted shaft. The differential housing 501 and the planetary carrier 203 are integrally formed. The first drive shaft 503a integrated on the first half-shaft gear 503 is a splined shaft with internal splines. The differential housing 501 is fixedly connected to the first drive shaft 503a. The first drive shaft 503a is rotatably disposed in the first shaft hole 403. The first half-shaft of the vehicle is connected to the first drive shaft 503a via a spline to achieve power transmission. The second drive shaft 504a integrated on the second half-shaft gear 504 passes through the output shaft of the rotor 302 and is rotatably disposed in the third shaft hole 605. The second half-shaft of the vehicle is connected to the second drive shaft 504a via a spline to achieve power transmission. Motor 3 drives the output shaft of rotor 302 to rotate. The sun gear 201 integrated on the output end 302a of rotor drives the first planetary gear 202 to rotate, thereby driving the planet carrier 203 to rotate. Since the planet carrier 203 is integrally formed with the differential housing 501 and the differential housing 501 is fixedly connected to the first drive shaft 503a, the differential housing 501 directly transmits the power of motor 3 to the first drive shaft 503a to drive the first drive shaft 503a to rotate, thereby driving the first half-shaft of the vehicle to rotate. In addition, the second planetary gear 502 connected to the differential housing 501 through a slotted shaft is also directly driven to rotate by the differential housing 501. Since the second planetary gear 502 meshes with the second half-shaft gear 504, the power is transmitted to the second drive shaft 504a to drive the second drive shaft 504a to rotate. When the vehicle turns, the second planetary gear 502 rotates on its own axis and revolves around the first half-shaft gear 503 and the second half-shaft gear 504, thereby realizing the differential transmission between the first half-shaft and the second half-shaft of the vehicle.

[0045] In an exemplary embodiment of this application, the third cavity 105 is located outside the first cavity 103 along the radial direction of the motor 3.

[0046] In this embodiment, by arranging the third cavity 105 on the outer side of the first cavity 103 along the radial direction of the motor 3, the third cavity 105 serves as an independent heat dissipation buffer area, which can effectively block the heat generated by the motor 3 from being conducted towards the controller.

[0047] In an exemplary embodiment of this application, the integrated housing 1 is provided with a partition 106 that separates the first cavity 103 and the second cavity 104, and the planetary carrier 203 is mounted on the partition 106 via the first bearing 7.

[0048] In this embodiment, the second shaft hole 106a is disposed on the partition portion 106, located on both sides of the second shaft hole 106a. The partition portion 106 is respectively provided with a first bearing 7 and a third bearing 9. The first bearing 7 is sleeved on the planetary carrier 203 and installed on the side of the partition portion 106 located in the first cavity 103. The first bearing 7 is used to support the planetary carrier 203 and to ensure that the planetary carrier 203 can rotate between the partition portion 106 and the partition portion 106. The third bearing 9 is sleeved on the rotor output end 302a and installed on the side of the partition portion 106 located in the second cavity 104. The third bearing 9 is used to support the rotor output end 302a and to ensure that the rotor output end 302a can rotate between the partition portion 106 and the partition portion 106.

[0049] In an exemplary embodiment of this application, the differential housing 501 includes a first half-shell 501a and a second half-shell 501b. The first half-shell 501a is integral with the planetary carrier 203. The first drive shaft 503a is mounted on the second half-shell 501b. The second half-shell 501b is supported on the first end cover 4 by a second bearing 8.

[0050] In this embodiment, the first half-shell 501a is integrally formed with the planetary carrier 203, the second half-shell 501b is connected to the first half-shell 501a, and the first drive shaft 503a is installed on the second half-shell 501b and passes through the first shaft hole 403. The second half-shell 501b is rotatably connected to the first end cover 4 by a second bearing 8, and supports the differential housing 501.

[0051] In another exemplary embodiment, a fourth bearing 10 and a fifth bearing 11 are provided on the second end cover 6 and located within the third shaft hole 605. The rotor free end 302b is supported on the second end cover 6 by the fourth bearing 10, and the motor 3 is supported on the partition 106 and the second end cover 6 by the third bearing 9 and the fourth bearing 10. The second drive shaft 504a is supported on the second end cover 6 by the fifth bearing 11, and the second drive shaft 504a is rotatably connected to the second end cover 6 by the fifth bearing 11.

[0052] In an exemplary embodiment of this application, the first end cover 4 is provided with a bracket 401 for mounting an air compressor, and the bracket 401 is integrally formed with the first end cover 4.

[0053] In this embodiment, a bracket 401 for mounting the air compressor is integrated on the first end cover 4. There is no need to design a separate bracket 401 for mounting the air compressor, which eliminates one component and the screw for mounting the bracket 401, making the overall vehicle layout easier. The bracket 401 is provided with mounting holes corresponding to the air compressor, which are used to pass through locking parts to connect the air compressor and the bracket 401, thereby mounting the air compressor on the electric drive system.

[0054] In an exemplary embodiment of this application, a reinforcing rib 402 is provided between the first end cap 4 and the bracket 401.

[0055] In this embodiment, multiple reinforcing ribs 402 are provided between the bracket 401 and the first end cap 4 to improve the rigidity of the bracket 401 and effectively improve the noise and vibration performance of the bracket 401. This embodiment includes four reinforcing ribs 402, of which three reinforcing ribs 402 are located below the bracket 401 to support the bracket 401 and improve the load-bearing capacity of the bracket 401, and one reinforcing rib is parallel to the bracket 401 and located on the bracket 401 to improve the stability of the bracket 401 and reduce swaying or vibration.

[0056] In an exemplary embodiment of this application, a high-voltage line interface 601 is provided on the second end cover 6. The high-voltage line interface 601 is integrally formed with the second end cover 6. A vent plug 602 is provided on the second end cover 6 at the high-voltage line interface 601. An oil-blocking structure 603 for preventing oil from contaminating the vent plug 602 is provided inside the high-voltage line interface 601.

[0057] In this embodiment, the motor 3 is electrically connected to the controller. By integrating a high-voltage line interface 601 on the second end cover 6, the controller's high-voltage line is connected to the motor 3 located in the second cavity 104 through the high-voltage line interface 601, further improving the integration of the integrated housing 1. A vent plug 602 is provided to balance the internal cavity pressure of the integrated housing 1. Multiple oil baffles are arranged around the vent plug 602 inside the high-voltage line interface 601 to effectively prevent oil from entering the vent plug 602 and thus avoid affecting the vent plug 602's effect on balancing the cavity pressure.

[0058] In an exemplary embodiment of this application, the high-voltage line interface 601 is provided with a reverse draft angle 604, which is inclined toward the second cavity 104.

[0059] In this embodiment, by designing a reverse draft angle 604 at the high-voltage line interface 601, oil accumulation at the high-voltage line interface 601 can be effectively prevented. By tilting the reverse draft angle 604 toward the second cavity 104, the oil at the high-voltage line interface 601 can flow into the second cavity 104 and merge into the oil pool of the electric drive system housing.

[0060] In an exemplary embodiment of this application, the integrated housing 1 is further provided with an oil pump cavity 107, an oil filter cavity 108, a thermostat valve cavity 109, and a heat exchanger cavity 110. An oil pump is installed in the oil pump cavity 107, a filter is installed in the oil filter cavity 108, a thermostat valve is installed in the thermostat valve cavity 109, and a heat exchanger is installed in the heat exchanger cavity 110.

[0061] In this embodiment, the side wall of the integrated housing 1 is provided with a stator 301 cooling oil channel and a rotor output end 302a cooling oil channel. The stator 301 cooling oil channel is arranged around the stator 301 assembly of the motor 3. The stator 301 cooling oil channel has oil outlets at both ends along the axial direction of the motor 3, corresponding to the winding positions at both ends of the stator 301. Cooling oil is sprayed onto the windings at both ends of the stator 301 and the three-phase copper busbar through the oil outlets, which can achieve precise spray cooling of the windings at both ends of the stator 301 and the three-phase copper busbar, thereby effectively reducing the temperature of the stator 301; the rotor output end 302a cooling oil... The cooling oil channels are located within the partition 106. The rotor output end 302a cooling oil channel is used to spray and cool the output end ring of the rotor 302. The integrated housing 1 has a planetary gear reducer 2 lubrication oil channel located in the side wall of the first cavity 103, which is used to spray and cool the planetary gear reducer 2. The first end cover 4 has a differential 5 lubrication oil channel, which is used to spray and cool the differential 5. The second end cover 6 has a rotor free end 302b cooling oil channel, which is used to spray and cool the free end ring of the rotor 302. The oil pump is connected to the oil sump of the integrated housing 1, and the planetary gear reducer 2 lubrication oil channel and the differential 5 lubrication oil channel are connected to the oil pump. The thermostatic valve is connected to the oil pump and has two oil outlet channels. When the oil temperature is low, such as below 50°C, the thermostatic valve is closed, and the oil directly enters the stator 301 cooling oil passage, the rotor output end 302a cooling oil passage, and the rotor free end 302b cooling oil passage to cool the motor 3. This ensures that the cooling oil, even at temperatures below 50°C, has a higher temperature than the cooling oil after passing through the heat exchanger, resulting in lower viscosity and reduced drag in the electric drive system. When the oil temperature is high, such as above 50°C, the thermostatic valve opens, and the oil enters the heat exchanger for heat exchange. The cooled oil then enters the stator 301 cooling oil passage, the rotor output end 302a cooling oil passage, and the rotor free end 302b cooling oil passage to cool the motor 3, ensuring continuous power output.

[0062] The working principle involves providing a first cavity 103 for mounting the planetary gear reducer 2, a second cavity 104 for mounting the motor 3, and a third cavity 105 for mounting the controller on the integrated housing 1, effectively improving the integration of the electric drive system. Furthermore, by employing the planetary gear reducer 2 and differential 5 arranged coaxially with the motor 3, the power transmission path is more direct, reducing energy loss during transmission. The vibration and noise propagation paths of the planetary gear reducer 2 and differential 5, also coaxially with the motor 3, are relatively short, and due to the high integration of components, the overall vibration and noise levels are relatively low. This application effectively reduces the radial dimension of the electric drive system, making the overall structure more compact, reducing weight, and decreasing space occupation, which is more conducive to vehicle layout.

[0063] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. An integrated coaxial electrical drive system, characterized by The integrated housing has a first end and a second end opposite to each other, and a first cavity and a second cavity are arranged in the integrated housing in parallel and communicate with each other in the direction from the first end to the second end, a planetary gear reducer is arranged in the first cavity, a motor is arranged in the second cavity, and the planetary gear reducer is coaxially arranged with the motor. A third cavity is arranged on the integrated housing, and the third cavity is used for mounting a controller. A first end cover is connected to the first end of the integrated housing, and a differential is arranged in the first end cover and coaxially arranged with the planetary gear reducer. A second end cover is connected to the second end of the integrated housing. A rotor output shaft of the motor is a hollow shaft, the planetary gear reducer comprises a sun gear, a first planetary gear, a planet carrier and a ring gear, the first planetary gear is meshed with the sun gear and the ring gear respectively, the sun gear is connected to a rotor output end of the rotor output shaft and coaxially arranged with the rotor output shaft, and the planet carrier is connected to the differential.

2. The integrated coaxial electro- drive system of claim 1, wherein: The differential comprises a differential housing, a second planetary gear, a first half shaft gear and a second half shaft gear, the differential housing is connected to the planet carrier, and the second planetary gear is connected to the differential housing, the first half shaft gear and the second half shaft gear are meshed with the second planetary gear respectively, the first half shaft gear is connected to a first transmission shaft, and the first transmission shaft is rotatably supported on the first end cover.

3. The integrated coaxial electro- drive system of claim 2, wherein: The second half shaft gear is connected to a second transmission shaft, the second transmission shaft passes through the rotor output shaft and is rotatably supported on the second end cover, and the first transmission shaft, the second transmission shaft and the rotor output shaft are coaxial. The third cavity is located on the outer side of the first cavity in the radial direction of the motor.

4. The integrated in-line electro-coat drive system of claim 1, wherein: A separation part for separating the first cavity and the second cavity is arranged in the integrated housing, and the planet carrier is mounted on the separation part through a first bearing.

5. The integrated in-line electro-coat drive system of claim 3, wherein: The differential housing comprises a first half housing and a second half housing, the first half housing is an integral structure with the planet carrier, the first transmission shaft is mounted on the second half housing, and the second half housing is supported on the first end cover through a second bearing.

6. The integrated in-line electro-coat drive system of claim 5, wherein: A support for mounting an air compressor is arranged on the first end cover, and the support is integrally formed with the first end cover.

7. The integrated in-line electro-coat drive system of claim 1, wherein: A reinforcing rib is arranged between the first end cover and the support.

8. The integrated in-line electro-cocking system of claim 7, wherein: A high-voltage line interface is arranged on the second end cover, and the high-voltage line interface is integrally formed with the second end cover.

9. The integrated in-line electro-coat drive system of claim 1, wherein: An air vent plug is arranged on the second end cover at the high-voltage line interface, and an oil blocking structure is arranged in the high-voltage line interface for blocking oil from soaking the air vent plug. A reverse draft angle is arranged in the high-voltage line interface, and the reverse draft angle is inclined towards the second cavity.

10. The integrated coaxial electro- drive system of claim 9, wherein: An oil pump cavity, an oil filter cavity, a thermostat cavity and a heat exchanger cavity are further arranged on the integrated housing, an oil pump is arranged in the oil pump cavity, a filter is arranged in the oil filter cavity, a thermostat is arranged in the thermostat cavity, and a heat exchanger is arranged in the heat exchanger cavity.

11. The integrated in-line electro-coat drive system of claim 1, wherein: ​

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