An electric drive system

Abstract

The present invention provides an electric drive system, comprising a motor, the motor having an output end face and a non-output end face that are roughly parallel; a reducer, the reducer is drivingly connected to the wheel, the output end face of the motor is connected to the side of the reducer that is away from the wheel, and the motor and the reducer are drivingly connected; a controller, the controller has a connecting surface, the center of the connecting surface is recessed to form a controller cavity, the non-output end face of the motor is connected to the connecting surface of the controller, and the motor is partially embedded in the controller cavity and can be surrounded by a controller cooling structure arranged on the inner wall of the controller cavity, thereby ensuring that the motor, the reducer and the controller can be arranged between two wheels with a certain wheelbase, and the cooling capacity of the controller and the motor can be achieved, thereby ensuring the reliable operation of the system.

Description

Technical Field

[0001] The present invention relates to the field of automobile electric drive technology, and in particular to an electric drive system. Background Art

[0002] In recent years, the field of new energy vehicles has developed rapidly. As one of the core components of new energy vehicles, the characteristics of electric drive determine the main performance indicators of vehicle driving. The existing drive device usually consists of a motor, a reducer and a controller, in which the controller is used to control the operation of the motor, and the motor is connected to the wheel through the reducer to achieve the movement of the wheel.

[0003] Since the wheelbase between the two wheels is fixed, the design of the motor, reducer and controller is limited by the wheelbase, and the motor and controller must be equipped with cooling structures, etc. In addition, as the motor power and torque need to continue to increase, there will be a need to increase the number of motors and reducers, further increasing the difficulty of design space. Summary of the invention

[0004] In order to solve the above problems, the present invention provides an electric drive system with a compact structure and a stable and reliable structure. It can be installed on two wheels with a certain wheelbase and can also add a cooling structure accordingly to improve the utilization of the design space.

[0005] An electric drive system, comprising:

[0006] At least one motor having an output end face and a non-output end face that are substantially parallel;

[0007] At least one reducer, the reducer is drivingly connected to the wheel, the output end face of the motor is connected to the side of the reducer away from the wheel, and the motor is drivingly connected to the reducer;

[0008] At least one controller, the controller has a connecting surface, the center of the connecting surface is recessed to form a controller cavity, the non-output end surface of the motor is connected to the connecting surface of the controller, and the motor part is embedded in the controller cavity and can be surrounded by a controller cooling structure arranged on the inner wall of the controller cavity.

[0009] As a preferred embodiment, the motor comprises:

[0010] A motor housing, wherein the output end surface and the non-output end surface are formed on both sides of the motor housing in an axial direction, the center of the non-output end surface is recessed to form a motor cavity, and when the non-output end surface is connected to the connection surface of the controller, the motor cavity and the controller cavity are connected;

[0011] At least one stator, the stator being located in the motor cavity;

[0012] At least one rotor, an air gap surface is formed between the rotor and the stator, the air gap surface is parallel to the controller and the reducer respectively, and the rotor is located on the side of the stator facing the reducer and is embedded in the controller cavity.

[0013] As a preferred embodiment, the motor further includes:

[0014] a resolver chamber, wherein the resolver chamber is embedded in the controller cavity;

[0015] An output shaft, one end of which is connected to the rotary chamber, the other end of which passes through the stator and passes through the output end surface to connect to the reducer, and the rotor is fixedly connected to the output shaft.

[0016] As a preferred embodiment, the inner wall of the controller cavity is recessed to form at least one accommodating cavity, and the controller cooling structure is detachably disposed in the accommodating cavity.

[0017] As a preferred embodiment, the center of the output end surface is recessed to form an auxiliary cavity, and the reducer part is embedded in the auxiliary cavity.

[0018] As a preferred embodiment, the number of the controller, the motor and the reducer are all two, the two controllers are connected in a way that the connecting surfaces are facing away from each other, the connecting surface of each controller is respectively connected to a non-output end surface of the motor, and the output end surface of each motor facing away from the controller is connected to a reducer, so that the controller, the motor and the reducer on the same side are connected in sequence.

[0019] As a preferred embodiment, the two controllers are arranged in a common controller housing, or the two controllers are integrally connected.

[0020] As a preferred embodiment, the reducer includes a reducer housing, the controller includes a controller housing, the motor housing and the controller housing are integrally connected, and / or the motor housing and the reducer housing are integrally connected.

[0021] As a preferred embodiment, the reducer is a planetary gear reducer, the reducer housing includes a reducer periphery, the controller housing includes a controller periphery, the motor housing includes a motor periphery, and the reducer periphery, the controller periphery and the motor periphery are substantially flush.

[0022] As a preferred embodiment, at least one of the following is provided with reinforcing ribs:

[0023] The bottom of the auxiliary cavity, the bottom of the accommodating cavity, the periphery of the reducer, the periphery of the controller, and the periphery of the motor.

[0024] Compared with the prior art, this technical solution has the following advantages:

[0025] First, the motor, the reducer and the controller are arranged side by side and integrally connected between two wheels with a certain wheelbase, and the motor part is embedded in the controller cavity of the controller, further reducing the overall axial size.

[0026] Second, by adding the controller cooling structure to the inner wall of the controller cavity, it is ensured that the controller and the motor can be cooled under the premise that the motor, the reducer and the controller are arranged between two wheels with a certain wheelbase, thereby ensuring the reliable operation of the system.

[0027] Third, the motor is an axial magnetic field motor, which has the characteristics of small axial size, higher power density, lighter weight and greater torque output. It can be seen that this embodiment arranges the motor and the reducer along the wheelbase direction and connects them as one, which can release more space between two wheels with a certain wheelbase to increase the design space of the reducer.

[0028] Fourth, each motor can output power independently, eliminating the need for mechanical differentials. With the electronic differential, distributed drive can be realized, helping the vehicle to achieve intelligent control. Due to the use of distributed drive, the vehicle has better control performance, a smaller turning radius, more stable controllability, and effectively solves slope start and unilateral slippage.

[0029] Fifth, the two motors and the two reducers are symmetrically arranged to ensure the rigidity of the system and to improve the noise, vibration and harshness (NVH) performance of the whole vehicle.

[0030] The present invention is further described below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a structural block diagram of the electric drive system of the present invention;

[0032] Figure 2 It is a structural block diagram of the transmission structure of the present invention;

[0033] Figure 3 is a three-dimensional diagram of the electric drive system of the present invention;

[0034] Figure 4 It is a front view of the electric drive system of the present invention;

[0035] Figure 5 An exploded view corresponding to the stereoscopic view of the electric drive system of the present invention;

[0036] Figure 6 for Figure 5 A is an enlarged schematic diagram;

[0037] Figure 7 This is an exploded view corresponding to the front view of the electric drive system of the present invention. DETAILED DESCRIPTION

[0038] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0039] like Figure 1 , Figure 5 and Figure 6 As shown, the electric drive system comprises:

[0040] At least one motor 200, wherein the motor 200 has an output end face 2001 and a non-output end face 2002 that are substantially parallel to each other;

[0041] At least one reducer 100, the reducer 100 is drivingly connected to the wheel 400, the output end face 2001 of the motor 200 is connected to the side of the reducer 100 away from the wheel 400, and the motor 200 is drivingly connected to the reducer 100;

[0042] At least one controller 300, the controller 300 having a connecting surface 3001, the center of the connecting surface 3001 being recessed to form a controller cavity 30011, the non-output end surface 2002 of the motor 200 being connected to the connecting surface 3001 of the controller 300, and the motor 200 being partially embedded in the controller cavity 30011 and capable of being surrounded by a controller cooling structure 320 disposed on the inner wall of the controller cavity 30011.

[0043] The motor 200, the reducer 100 and the controller 300 are arranged side by side and integrally connected between two wheels 400 with a certain wheelbase, and the motor 200 is partially embedded in the controller cavity 30011 of the controller 300, further reducing the overall axial size. In addition, by adding the controller cooling structure 320 to the inner wall of the controller cavity 30011, it is ensured that the motor 200, the reducer 100 and the controller 300 can be cooled under the premise of arranging the motor 200, the reducer 100 and the controller 300 between the two wheels with a certain wheelbase, thereby ensuring the reliable operation of the system.

[0044] like Figure 5 As shown, the axial magnetic field motor 200 has the characteristics of small axial size, higher power density, lighter weight and greater torque output. It can be seen that in this embodiment, the controller 300, the axial magnetic field motor 200 and the reducer 100 are arranged along the wheelbase direction and connected as one body, which can release more space between two wheels 400 of a certain wheelbase to increase the design space of the reducer 100 and meet the requirements of arranging two axial magnetic field motors 200 and two reducers 100 between two wheels 400. Specifically, the motor 200 includes:

[0045] A motor housing 210, wherein the output end surface 2001 and the non-output end surface 2002 are formed on both sides of the motor housing 210 in the axial direction, and the center of the non-output end surface 2002 is recessed to form a motor cavity 20021, and when the non-output end surface 2002 and the connecting surface 3001 of the controller 300 are connected, the motor cavity 20021 and the controller cavity 30011 are communicated;

[0046] At least one stator, the stator being located in the motor cavity 20021;

[0047] At least one rotor 230, an air gap surface is formed between the rotor 230 and the stator, the air gap surface is parallel to the controller 300 and the reducer 100 respectively, and the rotor 230 is located on the side of the stator facing the reducer 100, and is embedded in the controller cavity 30011.

[0048] The output end face 2001 and the non-output end face 2002 define the axial dimension of the motor 200, while the radial dimension of the motor 200 is significantly larger than the axial dimension of the motor 200. The air gap surface is parallel to the output end face 2001 and the non-output end face 2002, respectively, so that the motor has a disc-shaped structure, that is, the axial magnetic field motor has the advantage of a small axial dimension.

[0049] Since the rotor 230 is embedded in the controller cavity 30011, the controller cooling structure 320 on the inner wall of the controller cavity 3011 can cool it radially. Of course, a motor cooling structure can also be provided on the stator, and the motor cooling structure is arranged in close contact with the rotor, which can improve the cooling effect of the rotor 230. The motor cooling structure and the controller cooling structure 320 can be cooling pipes for passing a cooling medium (including a coolant or a cooling gas) to reduce the temperature.

[0050] Furthermore, the reducer 100 is relatively fixed, and the motor 200 is connected to the reducer 100 through the output end face 2001 thereon, and the reducer 100, the controller 300 and the motor 200 are all in a disc-shaped structure. And the air gap surface of the motor 200 is parallel to the controller 300 and the reducer 100 respectively, so that the motor 200 is effectively supported between the reducer 100 and the controller 300. Therefore, the distance from the center of gravity of the motor 200 to the reducer 100 can be shortened, and the force arm is smaller, so that the bending moment generated is smaller, the stability and reliability of the motor installation are improved, and the phenomenon of the reducer housing 110 being unable to withstand the dead weight of the motor and cracking is avoided. And in the design process of increasing the air gap surface to increase the motor torque, the force arm always maintains a smaller range, the load on the reducer housing 110 is smaller, and the design space is expanded.

[0051] According to the different numbers of the stators and the rotors 230 , the motor 200 can be divided into a single-rotor single-stator axial magnetic field motor and a dual-rotor single-stator axial magnetic field motor.

[0052] like Figure 4 and Figure 7 As shown, the motor 200 further includes:

[0053] A rotary chamber 240, wherein the rotary chamber 240 is embedded in the controller cavity 30011;

[0054] An output shaft 220 , one end of which is connected to the rotary chamber 240 , the other end of which passes through the stator and passes through the output end surface 2001 to connect to the reducer 100 , and the rotor 230 is fixedly connected to the output shaft 220 .

[0055] The rotary chamber 240 is provided with bearings and the like so that the output shaft 220 can rotate relative to the motor housing 210. By embedding the rotary chamber 240 in the controller cavity 30011, the structure is made more compact and the overall axial dimension is released accordingly, so as to improve the design space utilization.

[0056] like Figure 5 and Figure 6 As shown, the inner wall of the controller cavity 30011 is recessed to form at least one accommodating cavity 30012 , and the controller cooling structure 320 is detachably disposed in the accommodating cavity 30012 .

[0057] The radial dimensions of the controller 300, the motor 200 and the reducer 100 are approximately equal, while the radial dimension of the motor 200 is significantly larger than the axial dimension of the motor 200. That is, the controller 300 utilizes the characteristic of the larger radial dimension of the motor 200 to set a receiving cavity 30012 for accommodating the controller cooling structure 320 on the inner wall of the controller cavity 30011, and the controller cavity 30011 can accommodate the rotor 230 of the motor 200. In addition, the axial dimensions of the controller 300, the motor 200 and the reducer 100 can be smaller than the radial dimensions. Therefore, while ensuring that the overall radial dimensions are consistent, the overall axial dimension is reduced to release more space between two wheels of a certain wheelbase to increase the design space.

[0058] Furthermore, the controller cooling structure 320 is detachably disposed in the accommodating cavity 30012 to facilitate its maintenance and disassembly. Figure 5 and 6 The controller cooling structure 320 includes a cooling bracket 322 and a plurality of cooling pipes 321. The cooling pipes 321 are plugged into the cooling bracket 322. By plugging the cooling bracket 322 into the accommodating cavity 30012, the controller cooling structure 320 can be detachably disposed in the accommodating cavity 30012. In addition, when the controller cooling structure 320 is fixed in the accommodating cavity 30012, the plurality of cooling pipes 321 can be sequentially connected to the water inlet on the outer surface of the controller housing 310, so that the cooling medium can flow in the plurality of cooling pipes 321 in turn, so as to cool the circuit board in the controller housing 310 and the rotor 230 of the motor 200 accordingly.

[0059] The reducer 100 may adopt the following design method, which includes the following steps:

[0060] (a) The reducer 100 is designed according to the radial size of the motor 200 and the transmission ratio required by the electric drive system.

[0061] The motor 200 has the characteristics of small axial size, higher power density, lighter weight and greater torque output. It can be seen that in this embodiment, the motor 200 and the reducer 100 are arranged in the wheelbase direction and connected as one body, which can release more space between two wheels 400 of a certain wheelbase to increase the design space of the reducer 100, and can meet the requirements of arranging two motors 200 and two reducers 100 between two wheels 400. In addition, the reducer 100 is designed with the radial size of the motor 200 as the upper limit and the transmission ratio, and because the radial size of the motor 200 can be much larger than the axial size of the motor 200, the design space utilization rate of the reducer 100 is further increased under the premise of ensuring that the overall occupied space is small, and the reducer 100 with a larger transmission ratio can be equipped to make the car start faster.

[0062] like Figure 1 and Figure 2 As shown, the reducer 100 is a planetary gear reducer. The planetary gear reducer is shorter in axial length and longer in radial length, and can better match the shape of the axial magnetic field motor to improve its space utilization. Compared with the traditional radial motor, the combination of the planetary reducer and the axial magnetic field motor can have a larger radial size while maintaining the same volume, and can be designed with a higher transmission ratio and output torque.

[0063] The reducer 100 includes a reducer housing 110 and a transmission structure 120, and the step (a) includes:

[0064] (a1) Based on the radial dimension of the motor 200, the radial upper limit dimension of the reducer housing 110 is obtained.

[0065] The radial size of the motor 200 is determined by its output torque. The larger the output torque of the motor 200, the larger the radial size of the motor 200. Therefore, the motor 200 with the corresponding radial size can be selected by determining the output torque according to the application environment of the electric drive system.

[0066] In step (a1), the radial upper limit dimension of the reducer housing 110 is determined based on the radial dimension of the motor 200, that is, the radial dimension of the reducer housing 110 does not exceed the radial dimension of the motor 200, so as to prevent the reducer 100 from protruding radially outside the motor 200 and increasing the overall occupied space.

[0067] (a2) The transmission structure 120 is designed based on the radial upper limit dimension of the reducer housing 110 and the transmission ratio.

[0068] The radial upper limit dimension of the reducer housing 110 can determine the complexity of the transmission structure 120. Since the radial dimension of the motor 200 can be much larger than the axial dimension of the motor 200, the reducer 100 with a large transmission ratio can be designed while ensuring a small overall occupied space.

[0069] Further explanation, the larger the transmission ratio, the larger the output torque of the reducer 100, making the car start and accelerate faster. Similarly, the larger the transmission ratio, the more complex the transmission structure 120, and the larger the volume of the reducer housing 110 accommodating the transmission structure 120. The reducer housing 110 of this embodiment has a larger radial upper limit size, which increases the design space utilization of the reducer 100 while ensuring that the occupied space is small.

[0070] Furthermore, refer to Figure 1 and 2 The transmission structure 120 includes at least one driving wheel 1211 and at least one driven wheel 1212, the driving wheel 1211 and the driven wheel 1212 are in transmission connection and arranged along the radial direction of the reducer housing 110, and then the step (a2) includes:

[0071] According to the transmission ratio, the driving wheel 1211 and the driven wheel 1212 are designed to meet the radial upper limit size of the reducer housing 110 .

[0072] The number of the driving wheels 1211 and the driven wheels 1212 determines the transmission ratio of the transmission structure 120. Figure 2 The first-stage transmission ratio shown is used as an example to introduce the design process of the transmission structure 120. The number of the driving wheel 1211 and the driven wheel 1212 is one, that is, the transmission structure is a first-stage transmission. And the driven wheel 1212 is a ring gear and is fixedly arranged. The driving wheel 1211 of the wheel set 121 is a sun gear, and the driving wheel 1211 is rotatably arranged at the center of the ring gear and connected to the axial magnetic field motor 200. In addition, a planet carrier 1214 is arranged between the driving wheel 1211 and the driven wheel 1212, and the planet carrier 1214 is transmission-connected to the wheel 400. And the planet carrier 1214 is transmission-connected to the driving wheel 1211 and the driven wheel 1212 respectively with planet wheels 1214.

[0073] Continue to refer Figure 2 , the driving wheel 1211 and the driven wheel 1212 are arranged along the radial dimension of the reducer housing 110, that is, the radial dimension of the reducer housing 110 is related to the diameters of the driving wheel 1211 and the driven wheel 1212, and can be calculated using the following formula:

[0074] n=1+R / r;

[0075] Wherein, n is the transmission ratio, R is the pitch circle radius of the driven wheel 1212, and r is the pitch circle radius of the driving wheel.

[0076] The transmission ratio can be determined by the output torque of the motor 200 and the output torque of the reducer 100, wherein the reducer 100 is the output torque required by the electric drive system, that is, the output torque of the reducer 100 is divided by the output torque of the axial magnetic field motor 200 to obtain the transmission ratio. Based on this, the transmission ratio is substituted into the above calculation formula, and according to the radial upper limit size of the reducer housing 110, the driving wheel 1211 and the driven wheel 1212 accommodated in the reducer housing 110 can be obtained.

[0077] It should be noted that the actual radial dimension of the reducer housing 110 is not necessarily consistent with the radial upper limit dimension of the reducer housing 110, that is, the actual radial dimension of the reducer housing 110 may be smaller than the radial upper limit dimension of the reducer housing 110. The radial upper limit dimension of the reducer housing 110 refers to the maximum radial dimension that can be achieved, so as to prevent the size from being too large and increasing the occupied space.

[0078] Of course, the transmission structure 120 can be two-stage or above, and the above formula is adjusted to divide the driven wheel pitch circle radius of all meshing pairs of gear sets by the driving wheel pitch circle radius, and then multiply the results obtained and add 1 to obtain the transmission ratio.

[0079] From the above, it can be seen that the reducer 100 is only adjusted in radial dimension, while the axial dimension remains almost unchanged, that is, while ensuring the advantage of small axial dimension, the design space of the reducer 100 can be increased, and it is avoided that it cannot be installed between two wheels 400 with a certain wheelbase, and then the controller 300 and other equipment cannot be arranged between the two wheels 400, so that the design space is constrained.

[0080] It can be seen that the reducer 100 can be the same as the motor 200, which can also be in a disc-shaped structure, thereby freeing up space between the two wheels 300 and increasing the design space utilization. The motor 200 also has the following characteristics: when the power of the motor 200 is designed, it is only adjusted in the radial direction of the motor 200, while the axial dimension of the motor 200 remains almost unchanged, effectively utilizing the design space utilization, not only can two motors 200 and two reducers 100 be arranged between the two wheels 400, but even a controller 300 can be arranged.

[0081] like Figure 5As shown, the center of the output end face 2001 is recessed to form an auxiliary cavity 20011, and the reducer 100 is partially embedded in the auxiliary cavity 20011. The overall structure can also be made more compact, freeing up space between two wheels of a certain wheelbase to install two motors 200 and the reducer 100. The transmission structure 120 of the reducer 100 can be partially embedded in the auxiliary cavity 20011, and of course, a reducer cooling structure can also be added in the auxiliary cavity 20011 to ensure that the overall structure has a compact structure and also has cooling capacity.

[0082] Preferably, when the motor 200 is an axial magnetic field motor with a single stator and a single rotor, the stator of the motor 200 is fixed to the bottom of the motor cavity 20021, and the reducer cooling structure is also fixed to the bottom of the auxiliary cavity 20011. By shortening the distance between the bottom of the motor cavity 20021 and the bottom of the auxiliary cavity 20011, the reducer cooling can be set close to the stator to further enhance the cooling performance and ensure the reliable operation of the system.

[0083] like Figures 3 to 5 As shown, the reducer 100 includes a reducer housing 110, the controller 300 includes a controller housing 310, the motor housing 210 and the controller housing 310 are integrally connected, and / or the motor housing 210 and the reducer housing 110 are integrally connected.

[0084] Taking the integral connection of the motor housing 210 and the reducer housing 110 as an example, the two can be tightened and fixed by multiple bolts, wherein the bolts are arranged on the periphery of the motor housing 210 and the reducer housing 110 and can be hidden inside to make the structure compact and prevent the occupied space from becoming larger.

[0085] like Figure 1 and Figure 7 As shown, the reducer housing 110 includes a reducer periphery 1003 defining the radial size of the reducer 110, the controller housing 310 includes a controller periphery 3003 defining the radial size of the controller 300, and the motor housing 210 includes a motor periphery 2003 defining the radial size of the motor 200. Since the radial sizes of the three are roughly equal, the reducer periphery 1003, the controller periphery 3003 and the motor periphery 2003 are roughly flush.

[0086] It should be noted that when the actual radial dimension of the reducer housing 110 obtained by design is consistent with the radial dimension of the motor 200, the motor periphery 2003 and the reducer periphery 1003 of the two are completely flush. However, this embodiment is not limited to the actual radial dimension of the reducer housing 110 being smaller than the radial dimension of the motor 200, so there may be a situation where they are completely not flush, or some edges are flush.

[0087] like Figures 1 to 7 As shown, the number of the controller 300, the motor 200 and the reducer 100 are all two, and the two controllers 300 are connected in a way that the connecting surfaces 3001 are facing away from each other, and the connecting surface 3001 of each controller 300 is respectively connected to a non-output end surface 2002 of the motor 200, and the output end surface 2001 of each motor 200 facing away from the controller 300 is connected to a reducer 100, so that the controller 300, the motor 200 and the reducer 100 on the same side are connected in sequence.

[0088] It can be seen that the two motors 200 can output power independently, and can perform distributed drive on the two wheels 400 in conjunction with the electronic differential, so as to help the entire vehicle achieve intelligent control, while having a smaller turning radius and more stable controllability, and effectively solving problems such as starting on a slope and single-sided slipping.

[0089] As a preferred embodiment, the two controllers 300 are arranged in a common controller housing 310, or the two controllers 300 are connected in one piece. Of course, the controller housing 310 of the controller 300 and the motor housing 210 of the motor 200 share a common housing, and the two can be integrated, so that the high-voltage wiring harness and the low-voltage wiring harness between the motor 200 and the controller 300 are omitted, making the structure more compact and simple, while reducing the manufacturing cost.

[0090] Of course, an interface is provided on the non-output end surface 2002 of the motor 200. When the controller 300 is integrally connected to the non-output end surface 2002, it is electrically connected to the motor 200 through the interface thereon, which can also avoid the wiring harness being exposed and increasing the occupied space, and avoid the wiring harness connection process.

[0091] like Figure 5 As shown, at least one of the following is provided with a reinforcing rib 500:

[0092] The bottom of the auxiliary cavity 20011, the bottom of the accommodating cavity 30012, the periphery of the reducer 1003, the periphery of the controller 3003, and the periphery of the motor 2003.

[0093] By adding the reinforcing ribs 500, the structural strength of the installed parts can be ensured, and the volume can be reduced accordingly. Taking the bottom of the auxiliary cavity 20011 as an example, a plurality of reinforcing ribs 500 are arranged at intervals at the bottom of the auxiliary cavity 20011, which can shorten the distance between the bottom of the auxiliary cavity 20011 and the bottom of the motor cavity 20021, and ensure the support capacity of the plate body defined by the two for the stator and reducer cooling structure.

[0094] like Figure 1 The axial magnetic field motors 200 on both sides and the reducers 100 on both sides are respectively arranged correspondingly to ensure the rigidity of the system and to help improve the noise, vibration and harshness (NVH) performance of the whole vehicle.

[0095] In summary, the motor 200, the reducer 100 and the controller 300 are arranged side by side and integrally connected between two wheels 400 with a certain wheelbase, and the motor 200 is partially embedded in the controller cavity 30011 of the controller 300, further reducing the overall axial size. In addition, by adding the controller cooling structure 320 on the inner wall of the controller cavity 30011, it is ensured that the motor 200, the reducer 100 and the controller 300 can be arranged between two wheels with a certain wheelbase, and the cooling capacity of the controller 300 and the motor 200 can be achieved, thereby ensuring the reliable operation of the system. In addition, the motor 200 is an axial magnetic field motor, which has the characteristics of small axial size, higher power density, lighter weight and greater torque output. It can be seen that in this embodiment, the motor 200 and the reducer 100 are arranged along the wheelbase direction and integrally connected, which can release more space between two wheels 400 with a certain wheelbase to increase the design space of the reducer 100.

[0096] The embodiments described above are only used to illustrate the technical ideas and features of the present invention, and their purpose is to enable technicians in this field to understand the contents of the present invention and implement them accordingly. The patent scope of the present invention cannot be limited only by this embodiment, that is, any equivalent changes or modifications made according to the spirit disclosed by the present invention still fall within the patent scope of the present invention.

Claims

1. An electric drive system, characterized in that: include: At least one motor (200), the motor (200) having an output end face (2001) and a non-output end face (2002) that are substantially parallel; at least one reducer (100), the reducer (100) being drivingly connected to the wheel (400), the output end surface (2001) of the motor (200) being connected to a side of the reducer (100) facing away from the wheel (400), and the motor (200) and the reducer (100) being drivingly connected; At least one controller (300), the controller (300) having a connection surface (3001), the center of the connection surface (3001) being recessed to form a controller cavity (30011), the non-output end surface (2002) of the motor (200) being connected to the connection surface (3001) of the controller (300), and the motor (200) being partially embedded in the controller cavity (30011) and capable of being surrounded by a controller cooling structure (320) arranged on the inner wall of the controller cavity (30011); The motor (200) comprises: A motor housing (210), wherein the output end surface (2001) and the non-output end surface (2002) are formed on both sides of the motor housing (210) in an axial direction, and the center of the non-output end surface (2002) is recessed to form a motor cavity (20021); when the non-output end surface (2002) and the connection surface (3001) of the controller (300) are connected, the motor cavity (20021) and the controller cavity (30011) are in communication; At least one stator, the stator being located in the motor cavity (20021); At least one rotor (230), an air gap surface formed between the rotor (230) and the stator, and the rotor (230) located on the side of the stator facing the reducer (100) and embedded in the controller cavity (30011).

2. The electric drive system according to claim 1, characterized in that: The air gap surface is parallel to the controller (300) and the reducer (100) respectively.

3. The electric drive system according to claim 1, characterized in that: The motor (200) further comprises: a resolver chamber (240), the resolver chamber (240) being embedded in the controller chamber (30011); An output shaft (220), one end of the output shaft (220) being connected to the rotary transformer chamber (240), the other end of the output shaft (220) passing through the stator and passing through the output end surface (2001) to connect to the reducer (100), and the rotor (230) being fixedly connected to the output shaft (220).

4. The electric drive system according to claim 1, characterized in that: The inner wall of the controller cavity (30011) is recessed to form at least one accommodating cavity (30012), and the controller cooling structure (320) is detachably arranged in the accommodating cavity (30012).

5. The electric drive system according to claim 4, characterized in that: The center of the output end surface (2001) is recessed to form an auxiliary cavity (20011), and the reducer (100) is partially embedded in the auxiliary cavity (20011).

6. The electric drive system according to claim 5, characterized in that: The reducer (100) comprises a reducer housing (110), the controller (300) comprises a controller housing (310), the motor housing (210) and the controller housing (310) are integrally connected, and / or the motor housing (210) and the reducer housing (110) are integrally connected.

7. The electric drive system according to claim 6, characterized in that: The reducer (100) is a planetary gear reducer, the reducer housing (110) includes a reducer periphery (1003), the controller housing (310) includes a controller periphery (3003), and the motor housing (210) includes a motor periphery (2003), and the reducer periphery (1003), the controller periphery (3003) and the motor periphery (2003) are substantially flush.

8. The electric drive system according to claim 7, characterized in that: At least one of the following is provided with reinforcing ribs (500): The bottom of the auxiliary cavity (20011), the bottom of the accommodating cavity (30012), the periphery of the reducer (1003), the periphery of the controller (3003), and the periphery of the motor (2003).

9. The electric drive system according to claim 1, characterized in that: The number of the controller (300), the motor (200) and the reducer (100) is two each, the two controllers (300) are connected in a manner that the connection surfaces (3001) face away from each other, the connection surface (3001) of each controller (300) is respectively connected to a non-output end surface (2002) of the motor (200), and the output end surface (2001) of each motor (200) facing away from the controller (300) is connected to a reducer (100), so that the controller (300), the motor (200) and the reducer (100) on the same side are connected in sequence.

Images