Driving device and electric vehicle

Abstract

The utility model provides a driving device and an electric vehicle, a shell of the driving device is used for fixing a stator of a driving motor and accommodating a rotor of the driving motor, the shell comprises a mounting hole and penetrates through the shell along the axial mounting hole of the driving device, and a motor shaft of the driving motor penetrates through the mounting hole. The inner surface, facing a rotor of the driving motor, of an axial shell of the driving device is used for fixing the annular shielding cover, the annular shielding cover is used for fixing a stator of the rotary transformer, the rotor of the rotary transformer is fixed to a motor shaft, the annular shielding cover comprises a through hole, and the motor shaft penetrates through the through hole. The stator of the rotary transformer and the annular shielding cover are arranged between the rotor of the driving motor and the mounting hole along the axial direction of the driving device, so that the rotary transformer is not interfered by the driving motor along the axial direction of the driving device under the condition that the axial space between the rotor of the driving motor and the inner surface can be fully utilized; and the signal quality output by the rotary transformer is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric vehicles, in particular to a driving device and an electric vehicle. BACKGROUND

[0002] The driving motor is generally controlled in closed loop by feeding back the rotating speed signal of the resolver, and the anti-electromagnetic interference ability of the magnetic resistance resolver is poor. When there is a strong electromagnetic field near the magnetic resistance resolver, such as alternating strong current, magnetic powder brake, electromagnetic brake and other strong external magnetic field, the signal output by the resolver after being affected has large fluctuation, so that the driving motor cannot run in closed loop, and therefore a shielding cover is needed to isolate the resolver to prevent other components from interfering with the resolver. Currently, the resolver and the shielding cover are mainly fixed on the motor end cover side of the driving motor, and the shielding cover and the resolver occupy the axial dimension of the driving motor, so that the axial volume of the driving motor is large. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a driving device and an electric vehicle to reduce the axial dimension of the driving device in the case of shielding the resolver.

[0004] In the first aspect, the present application provides a driving device, the housing of the driving device is used to fix the stator of the driving motor and accommodate the rotor of the driving motor, the housing includes a mounting hole, the mounting hole penetrates the housing along the axial direction of the driving device, and the motor shaft of the driving motor penetrates the mounting hole. Wherein, the inner surface of the housing along the axial direction of the driving device towards the rotor of the driving motor is used to fix the annular shielding cover, the annular shielding cover is used to fix the stator of the resolver, the rotor of the resolver is fixed on the motor shaft, the annular shielding cover includes a through hole, the through hole is used to penetrate the motor shaft, and the stator of the resolver and the annular shielding cover are arranged between the rotor of the driving motor and the mounting hole along the axial direction of the driving device.

[0005] In the embodiment of the present application, the inner surface of the rotor of the driving motor is used to fix the annular shield, the annular shield is used to fix the stator of the rotary transformer, the rotor of the rotary transformer is fixed to the motor shaft, the annular shield comprises a through hole for penetrating the motor shaft, and the annular shield penetrates the motor shaft, so that the annular shield does not need to occupy additional axial space of the driving device, and the axial length of the driving device is reduced. The position where the stator of the rotary transformer is fixed to the housing can not be a plane, compared with directly fixing the stator of the rotary transformer to the housing, the annular shield is used to fix the stator of the rotary transformer, so that the installation and dismounting of the stator of the rotary transformer are more convenient, the annular shield is more conducive to isolating the rotary transformer from the driving motor, and the housing structure is simpler.

[0006] In the embodiment of the present application, the annular shield is fixed between the housing of the driving device and the rotor of the driving motor, and then the annular shield is used to fix the stator of the rotary transformer, so that the rotary transformer is not disturbed by the driving motor, the rotary transformer and the annular shield can be installed between the rotor of the driving motor and the inner surface of the housing along the axial direction of the driving device, the detection accuracy of the rotary transformer is improved, and the axial size of the driving device is reduced.

[0007] In one embodiment, the annular shield is made of high-permeability material, so that the magnetic lines generated by the driving motor flow into the annular shield when flowing to the vicinity of the rotary transformer, and the magnetic lines of the stator of the rotary transformer are prevented from being disturbed.

[0008] In the embodiment of the present application, the annular shield is fixed to the inner surface of the rotor of the driving motor along the axial direction of the driving device, the through hole of the annular shield penetrates the motor shaft, and then the annular shield is used to fix the stator of the rotary transformer, so that the rotary transformer is not disturbed by the driving motor along the axial direction of the driving device, the rotary transformer and the annular shield can be installed between the rotor of the driving motor and the inner surface of the housing along the axial direction of the driving device, and the axial length of the driving device is reduced.

[0009] In an embodiment, the surface of the annular shield facing away from the rotor of the driving motor along the axial direction of the driving device is used to fix the stator of the resolver. The resolver can be mounted to the annular shield from the direction away from the housing along the axial direction of the driving device. Specifically, the housing comprises a motor slot and a motor end cover, the motor end cover is used to enclose the slot opening of the motor slot to form a motor cavity, the mounting holes are distributed on the slot bottom of the motor slot, the annular shield is inserted into the motor slot from the slot opening of the motor slot and fixed on the slot bottom of the motor slot, and then the resolver is inserted into the motor slot from the slot opening of the motor slot and fixed on the annular shield, so that the resolver is easier to install.

[0010] In an embodiment, the surface of the annular shield facing away from the rotor of the driving motor along the axial direction of the driving device is used to fix the stator of the resolver, so that the annular shield and the housing shield the magnetic field interference of the driving motor from both sides of the resolver, and the signal transmission quality of the resolver is improved. In an embodiment, the annular shield and the housing enclose a shielding cavity, and the resolver is distributed in the shielding cavity.

[0011] In an embodiment, the mounting holes are distributed on the motor end cover, the annular shield is fixed on the motor end cover, and the motor end cover, the annular shield, the resolver and the rotor of the driving motor are arranged in sequence along the axial direction of the driving device. The annular shield and the resolver can be fixedly installed on the motor end cover first, and then assembled with the motor slot and the motor shaft of the driving motor, so that the annular shield and the resolver are easy to install.

[0012] In an embodiment, the annular shield is used to fix at least one fixing member, the at least one fixing member is distributed on the circumferential side of the through hole, each fixing member protrudes from the annular shield along the axial direction of the driving device, and each fixing member is used to fix the stator of the resolver and isolate the stator of the resolver and the annular shield to form a gap.

[0013] In the embodiments of the present application, the at least one fixing member is distributed on the circumferential side of the through hole, and the at least one fixing member is used to fix the stator of the resolver, so that the stator of the resolver can be more firmly fixed on the annular shield.

[0014] In the embodiments of the present application, each fixing member protrudes from the annular shield, so that the fixing member can isolate the stator of the resolver and the annular shield to form a gap, so that the stator of the resolver does not directly contact the annular shield, thereby forming an air gap between the annular shield and the stator of the resolver, achieving air isolation between the stator of the resolver and the annular shield, preventing the annular shield from receiving the conducted magnetic lines generated by the driving motor and transmitting to the stator of the resolver, and enabling the resolver to output high-quality signals.

[0015] In an embodiment, the annular shield is arranged to have a surface facing the rotor of the drive motor for fixing the stator of the resolver, the annular shield is arranged to have a surface facing away from the rotor of the drive motor for fixing at least one fixing member, each fixing member is arranged to protrude from the annular shield towards the rotor of the drive motor along the axial direction of the drive device.

[0016] In an embodiment, the annular shield is arranged to have a surface facing away from the rotor of the drive motor for fixing the stator of the resolver, the annular shield is arranged to have a surface facing away from the rotor of the drive motor for fixing at least one fixing member, each fixing member is arranged to protrude from the annular shield away from the rotor of the drive motor along the axial direction of the drive device.

[0017] In an embodiment, the magnetic permeability of the at least one fixing member is less than the magnetic permeability of the annular shield.

[0018] In the embodiments of the present application, the fixing member is arranged to fix the stator of the resolver, and the magnetic permeability of the fixing member is less than the magnetic permeability of the annular shield, so that the magnetic lines of force generated by the drive motor are prevented from flowing from the fixing member to the stator of the resolver when flowing into the annular shield, thereby reducing the magnetic lines of force generated by the drive motor interfering with the magnetic lines of force of the stator of the resolver, thereby reducing the interference with the magnetic field of the resolver, and facilitating to ensure the accuracy of the resolver detecting the position and speed information of the rotor of the drive motor.

[0019] In an embodiment, the annular shield is made of a material with high magnetic permeability, and the fixing member is made of a material with low magnetic permeability. In an embodiment, the annular shield is made of steel, and the fixing member is made of aluminum.

[0020] In an embodiment, the at least one fixing member includes three fixing members, which are uniformly distributed around the periphery of the through hole, so that the stator of the resolver can be more firmly fixed to the annular shield.

[0021] In an embodiment, the annular shield further includes a clearance groove, the clearance groove surrounds the periphery of the through hole, and the groove opening of the clearance groove faces away from the inner surface of the housing along the axial direction of the drive device, the stator of the resolver includes a stator protrusion protruding towards the annular shield along the axial direction of the drive device, the clearance groove is arranged to accommodate the stator protrusion of the resolver, and the clearance groove is arranged between the at least one fixing member and the through hole along the radial direction of the drive device.

[0022] In the embodiments of the present application, the inner surface of the housing facing the rotor of the drive motor along the axial direction of the drive device is arranged to fix the annular shield, and the groove opening of the clearance groove of the annular shield faces away from the inner surface of the housing along the axial direction of the drive device, so that the stator of the resolver can be installed from the direction away from the inner surface of the housing of the housing along the axial direction of the drive device, facilitating installation.

[0023] In the embodiment of the present application, the slot of the clearance groove is away from the inner surface of the shell along the axial direction of the driving device, and the stator of the rotary transformer includes a stator protrusion protruding towards the annular shield along the axial direction of the driving device, so that the clearance groove can accommodate the stator protrusion of the rotary transformer, and thus the stator protrusion will not directly contact the annular shield when the stator of the rotary transformer is fixed to the annular shield by the at least one fixing member, and the magnetic flux generated by the driving motor received by the annular shield will not be conducted to the rotary transformer from the stator protrusion.

[0024] In the embodiment of the present application, the clearance groove is arranged between the at least one fixing member and the through hole along the radial direction of the driving device, so that the installation and fixation of the stator protrusion will not be interfered by the fixing member, and the stator protrusion will not pass through the through hole of the annular shield to a position outside the annular shield, so that the interference of the driving motor on the stator protrusion can be avoided, and the detection accuracy of the rotary transformer is ensured.

[0025] In one embodiment, the inner diameter of the through hole is greater than the outer diameter of the rotor of the rotary transformer and less than the inner diameter of the stator of the rotary transformer.

[0026] In the embodiment of the present application, the inner diameter of the through hole is less than the inner diameter of the stator of the rotary transformer, so that the annular shield completely shields the rotary transformer along the radial direction of the driving device, and the anti-interference of the annular shield on the rotary transformer is improved. The inner diameter of the through hole is greater than the outer diameter of the rotor of the rotary transformer, so that there is a space between the rotor of the rotary transformer and the annular shield, so that air isolation is formed between the rotor and the stator of the rotary transformer, and the magnetic flux flowing into the annular shield will not interfere with the magnetic flux between the rotor and the stator of the rotary transformer. The inner diameter of the through hole is greater than the outer diameter of the rotor of the rotary transformer and less than the inner diameter of the stator of the rotary transformer, so that the annular shield can better isolate the stator of the rotary transformer and the rotor of the rotary transformer from the driving motor along the radial direction of the driving device, and it is more conducive to the rotary transformer to detect and transmit accurate position and speed information of the rotor of the driving motor. The inner diameter of the through hole is greater than the outer diameter of the rotor of the rotary transformer, and the rotor of the rotary transformer can pass through the through hole more conveniently and smoothly.

[0027] In one embodiment, the stator of the driving motor includes a stator core and a stator winding, the stator winding is fixed to the stator core, the stator winding includes a winding end portion, the winding end portion is exposed to the side of the stator core facing the mounting hole along the axial direction of the driving device, and the stator of the rotary transformer and the annular shield are distributed on the inner side of the winding end portion along the radial direction of the driving device.

[0028] In the embodiment of the present application, the stator winding includes winding end portions exposed to the side of the stator core facing the mounting hole along the axial direction of the driving device, so that the inner side of the winding end portions of the stator winding along the radial direction of the driving device has space for accommodating the stator and the annular shield of the rotary transformer, and the stator and the annular shield of the rotary transformer are closer to the stator core, which is conducive to making the axial layout of the driving device more compact, thereby reducing the axial volume of the driving device.

[0029] In the embodiment of the present application, the stator and the annular shield of the rotary transformer are distributed on the inner side of the winding end portions along the radial direction of the driving device, so that the stator and the annular shield of the rotary transformer can be arranged within the envelope of the winding end portions, making full use of the axial space within the winding end portions, which is conducive to reducing the axial space of the driving device. The annular shield can also be used to axially isolate the driving motor from the stator of the rotary transformer when the axial size of the driving device is small, thereby ensuring the detection accuracy of the rotary transformer. When the stator of the rotary transformer is distributed on the inner side of the winding end portions along the radial direction of the driving device, the stator of the rotary transformer is more disturbed by the winding end portions, and the annular shield is more needed for isolation, so the annular shield also needs to be arranged on the inner side of the winding end portions.

[0030] In one embodiment, the inner surface of the housing along the axial direction of the driving device towards the rotor of the driving motor includes a fixing protrusion, the fixing protrusion protrudes along the axial direction of the driving device towards the rotor of the driving motor, the mounting hole penetrates the fixing protrusion, and the surface of the fixing protrusion along the axial direction of the driving device towards the rotor of the driving motor is used for fixing the annular shield, and the surface of the annular shield along the axial direction of the driving device towards the rotor of the driving motor is used for fixing the stator of the rotary transformer.

[0031] In the embodiment of the present application, the inner surface of the housing along the axial direction of the driving device towards the rotor of the driving motor includes a fixing protrusion, the fixing protrusion protrudes along the axial direction of the driving device towards the rotor of the driving motor, which is more convenient for fixing the annular shield on the inner surface of the housing through the fixing protrusion, and simplifies the installation process.

[0032] In the embodiment of the present application, the mounting hole penetrates the fixing protrusion, so that the motor shaft of the driving motor can also penetrate the fixing protrusion.

[0033] In the embodiment of the present application, the surface of the fixing protrusion along the axial direction of the driving device towards the rotor of the driving motor is used for fixing the annular shield, so that the annular shield can be arranged between the fixing protrusion and the rotor of the driving motor, and the magnetic lines conducted by the annular shield can also be conducted to the housing through the fixing protrusion.

[0034] In the embodiment of the present application, the annular shield is arranged along the axial direction of the driving device towards the surface of the rotor of the driving motor for fixing the stator of the resolver, so that the annular shield can be fixed between the stator of the resolver and the fixing protrusion, thereby not only isolating the axial interference of the winding end to the stator of the resolver, but also conducting the magnetic force lines out through the fixing protrusion.

[0035] In an embodiment, the annular shield comprises an annular protrusion, the annular protrusion is protruded along the axial direction of the driving device, the inner side of the annular protrusion along the radial direction of the driving device is used for accommodating the stator of the resolver, the inner diameter of the annular protrusion is greater than the outer diameter of the stator of the resolver, and the outer diameter of the annular protrusion is smaller than the inner diameter of the winding end.

[0036] In the embodiment of the present application, the annular protrusion is protruded along the axial direction of the driving device, the inner diameter of the annular protrusion is greater than the outer diameter of the stator of the resolver, and the inner side of the annular protrusion along the radial direction of the driving device is used for accommodating the stator of the resolver, so that the stator of the resolver can be completely arranged in the annular protrusion of the annular shield along the radial direction of the driving device, so that the annular protrusion can isolate the magnetic force line interference of the winding end to the stator of the resolver in the radial direction of the driving device. Also, when the stator of the resolver is fixed in the annular shield, the annular shield can envelope the stator of the resolver, so that the annular shield can also protect the stator of the resolver, so that the stator of the resolver can be protected in the axial direction and the radial direction of the driving device.

[0037] In the embodiment of the present application, the outer diameter of the annular protrusion is smaller than the inner diameter of the winding end, so that the volume of the annular shield is not too large, so that the annular shield can be arranged in the winding end along the radial direction and the axial direction of the driving device, so that the annular shield can isolate the winding end and the stator of the resolver in the axial direction and the radial direction of the driving device, which is beneficial to the resolver to accurately detect and transmit the position and speed information of the rotor of the driving motor.

[0038] In an embodiment, the annular shield further comprises a threading hole, the threading hole penetrates through the annular shield along the axial direction of the driving device, and the threading hole is used for threading the connecting line between the resolver and the motor controller. The spacing between the threading hole and the motor shaft axis along the radial direction of the driving device is greater than the outer diameter of the stator of the resolver, and the threading hole is arranged between the annular protrusion and the through hole along the radial direction of the driving device.

[0039] In the embodiment of the present application, the annular shield cover comprises an annular protrusion, so that the connecting line between the rotary transformer and the motor controller is not convenient to pass out of the annular shield cover along the radial direction of the driving device, the threading hole is arranged through the annular shield cover along the axial direction of the driving device, and the connecting line between the rotary transformer and the motor controller can pass through the threading hole along the axial direction of the driving device.

[0040] In the embodiment of the present application, the distance between the threading hole along the radial direction of the driving device and the motor shaft axis is greater than the outer diameter of the stator of the rotary transformer, so that the annular shield cover not only has space to accommodate the stator of the rotary transformer, but also has space to accommodate the connecting line between the rotary transformer and the motor controller, and the connecting line between the rotary transformer and the motor controller has sufficient space to pass out of the threading hole.

[0041] In the embodiment of the present application, the threading hole along the radial direction of the driving device is arranged between the annular protrusion and the through hole, so that the annular protrusion can also isolate the connecting line between the rotary transformer and the motor controller, which is conducive to transmitting accurate signals from the rotary transformer to the motor controller.

[0042] In one embodiment, the annular protrusion comprises an anti-collision section, the length of the anti-collision section along the axial direction of the driving device is greater than the length of other parts of the annular protrusion, and the threading hole is arranged between the anti-collision section and the through hole.

[0043] In the embodiment of the present application, the axial length of the connecting line between the rotary transformer and the motor controller is relatively long, the length of the anti-collision section along the axial direction of the driving device is set to be greater than the length of other parts of the annular protrusion, which is conducive to the anti-collision protection of the anti-collision section to the connecting line between the rotary transformer and the motor controller, conducive to avoiding the collision between the winding end and the connecting line between the rotary transformer and the motor controller in the radial direction of the driving device during assembly, and conducive to ensuring that the detection signal of the rotary transformer can be transmitted to the motor controller in real time.

[0044] In the embodiment of the present application, the threading hole is arranged between the anti-collision section and the through hole, so that the connecting line between the rotary transformer and the motor controller passing through the threading hole is arranged between the anti-collision section and the through hole, so that the anti-collision section can also isolate the interference of the winding end to the connecting line between the rotary transformer and the motor controller in the radial direction of the driving device, which is conducive to transmitting accurate signals from the rotary transformer to the motor controller.

[0045] In one embodiment, the housing of the driving device comprises a motor cavity and a reducer cavity, the motor cavity is used to accommodate the stator of the driving motor and the rotor of the driving motor, the reducer cavity is used to accommodate the gear shaft of the reducer, the motor cavity and the reducer cavity are arranged along the axial direction of the driving device, the mounting hole is used to communicate the motor cavity and the reducer cavity, and the motor shaft of the driving motor is used to drive the wheel through the gear shaft of the reducer.

[0046] In the embodiment of the present application, the motor cavity and the reducer cavity are arranged along the axial direction of the driving device, the mounting hole is used to communicate the motor cavity and the reducer cavity, the motor shaft of the driving motor passes through the mounting hole, the stator of the resolver is fixed to the motor shaft, and along the axial direction of the driving device, the stator of the resolver and the annular shield are arranged between the rotor of the driving motor and the mounting hole, so that the arrangement of the annular shield and the resolver can utilize the space between the motor cavity and the reducer cavity, the arrangement of the annular shield and the resolver does not additionally occupy the space of the housing of the driving device along the axial direction of the driving device, and the isolation of the driving motor and the resolver is facilitated to be realized in the case that the axial dimension of the driving device is small, and the normal operation of the resolver is ensured. In the embodiment of the present application, the driving device can also be referred to as a power assembly.

[0047] In an embodiment, the housing of the driving device further comprises a bearing groove, the bearing groove is used to fix the outer ring of the bearing, the inner ring of the bearing is fixed to the motor shaft, the slot of the bearing groove faces away from the inner surface of the annular shield along the axial direction of the driving device, the bearing groove is recessed towards the rotor of the driving motor along the axial direction of the driving device, and the mounting hole communicates the motor cavity and the bearing groove.

[0048] In the embodiment of the present application, the slot of the bearing groove faces away from the inner surface of the annular shield along the axial direction of the driving device, the bearing groove is recessed towards the rotor of the driving motor along the axial direction of the driving device, and the inner surface of the housing towards the rotor of the driving motor along the axial direction of the driving device comprises a fixing protrusion, the fixing protrusion is protruded towards the rotor of the driving motor along the axial direction of the driving device, and the mounting hole penetrates the fixing protrusion, so that the bearing groove can be arranged on the side of the fixing protrusion away from the rotor of the driving motor along the axial direction of the driving device, and the bearing groove is located on the inner side of the fixing protrusion along the radial direction of the driving device, so that the distance between the bearing groove and the annular shield fixed by the fixing protrusion is smaller, and the axial dimension of the driving device is more favorable to be small, and the driving device is more favorable to be miniaturized.

[0049] In an embodiment, the motor shaft of the driving motor is in transmission connection with the input shaft in the gear shaft of the reducer, the motor shaft of the driving motor passes through the input shaft of the reducer, the annular shield and the stator of the resolver are fixed to the motor shaft of the driving motor, and the inner ring of the bearing is fixed to the input shaft of the reducer. In an embodiment, the motor shaft of the driving motor and the input shaft of the reducer are an integrated shaft, and the structural strength is stronger.

[0050] In an embodiment, the driving device comprises two driving motors, two reducers, two rotary transformers and two ring-shaped shields, the driving device comprises two housings and a partition plate, the two housings are arranged on two sides of the partition plate along the axial direction of the driving device, and the reducer cavities of the two housings are arranged between the motor cavities of the two housings. The interval of the two ring-shaped shields along the axial direction of the driving device is less than the interval of the stators of the two rotary transformers fixed by the two ring-shaped shields.

[0051] In the embodiment, the interval of the two ring-shaped shields along the axial direction of the driving device is less than the interval of the stators of the two rotary transformers fixed by the two ring-shaped shields, so that the two ring-shaped shields can be arranged in the housings on the two sides of the partition plate along the axial direction of the driving device, and then the stators of the two rotary transformers are fixed by the two ring-shaped shields respectively, so that the arrangement of the two ring-shaped shields and the two rotary transformers can make full use of the axial space between the reducer cavities and the motor cavities in the two housings, which is beneficial to the driving device to have a smaller axial size, and the winding end of the driving motor can be isolated from the rotary transformer by the ring-shaped shield, so as to ensure the normal operation of the two rotary transformers, and the motor controller can receive accurate position and speed signals of the rotor of the driving motor. In the embodiment, the driving device can also be referred to as a double-motor power assembly.

[0052] In an embodiment, the stator of each driving motor comprises a stator core and a stator winding, the stator winding is fixed to the stator core, the stator winding comprises a winding end exposed at both ends of the stator core, and the stator, the rotor and the ring-shaped shield of the rotary transformer are distributed inside the winding end along the radial direction of the driving device. The interval of the two ring-shaped shields along the axial direction of the driving device is greater than the interval of the winding ends of the two driving motors towards the reducer cavities.

[0053] In the embodiment, the stator, the rotor and the ring-shaped shield of the rotary transformer are distributed inside the winding end along the radial direction of the driving device, so that the arrangement of the stator, the rotor and the ring-shaped shield of the rotary transformer can make full use of the space of the winding end of the stator of each driving motor along the axial direction of the driving device, which is beneficial to reducing the axial size of the driving device. The driving device can also axially isolate the winding end of the driving motor from the rotary transformer by the ring-shaped shield when the axial size of the driving device is small, so as to ensure the detection accuracy of the rotary transformer.

[0054] In the embodiment of the present application, the interval of the two annular shields along the axial direction of the driving device is greater than the interval of the winding ends of the two driving motors towards the one end of the reducer cavity, so that the stators of the two rotary transformers fixed by the two annular shields can be arranged in the winding ends of the two driving motors towards the one end of the reducer cavity along the radial direction of the driving device, so that the arrangement of the two annular shields does not additionally occupy the axial space of the driving device, and also enables the driving device to axially isolate the winding ends of the two driving motors from the two rotary transformers and radially isolate the winding ends of the two driving motors from the two rotary transformers in the case of small axial size, and guarantees the detection accuracy of the two rotary transformers.

[0055] In a second aspect, the present application provides an electric vehicle, which comprises a frame and the driving device as in the first aspect, the frame being used for fixing the driving device, and the driving device being used for driving the wheels.

[0056] In the driving device in the embodiment of the present application, the annular shield is fixed to the inner surface of the rotor of the driving motor along the axial direction of the driving device, and the through hole of the annular shield passes through the motor shaft, and then the stator of the rotary transformer is fixed by the annular shield to fix the rotary transformer between the rotor of the driving motor and the housing, so that the rotary transformer and the annular shield do not additionally occupy the axial space outside the driving motor, and the annular shield can also shield the magnetic field of the stator of the driving motor from interfering with the signal quality of the rotary transformer, so that the driving device can install the rotary transformer and the annular shield in the space between the rotor of the driving motor and the inner surface of the housing along the axial direction of the driving device without being interfered by the driving motor. BRIEF DESCRIPTION OF DRAWINGS

[0057] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be described below.

[0058] Figure 1 is a schematic diagram of an electric vehicle provided by the embodiment of the present application;

[0059] Figure 2 is a schematic diagram of a driving device provided by the embodiment of the present application;

[0060] Figure 3 is another schematic diagram of a driving device provided by the embodiment of the present application;

[0061] Figure 4 is another schematic diagram of a driving device provided by the embodiment of the present application;

[0062] Figure 5 is a schematic diagram of a rotary transformer and an annular shield provided by the embodiment of the present application;

[0063] Figure 6 is a schematic diagram of a resolver provided by an embodiment of the present application;

[0064] Figure 7 is a schematic diagram of an annular shield provided by an embodiment of the present application;

[0065] Figure 8 is a sectional view of a resolver and an annular shield provided by an embodiment of the present application;

[0066] Figure 9 is another schematic diagram of a driving device provided by an embodiment of the present application;

[0067] Figure 10 is a schematic diagram of a driving device provided by another embodiment of the present application;

[0068] Figure 11 is a schematic diagram of a driving device provided by another embodiment of the present application. DETAILED DESCRIPTION

[0069] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application.

[0070] The present application provides a driving device, a housing of the driving device is used to fix a stator of a driving motor and accommodate a rotor of the driving motor, the housing comprises a mounting hole, the mounting hole penetrates the housing along an axial direction of the driving device, and a motor shaft of the driving motor penetrates the mounting hole. Wherein, an inner surface of the housing along the axial direction of the driving device and towards the rotor of the driving motor is used to fix an annular shield, the annular shield is used to fix a stator of a resolver, a rotor of the resolver is fixed to the motor shaft, the annular shield comprises a through hole, the through hole is used to penetrate the motor shaft, and the stator of the resolver and the annular shield are arranged between the rotor of the driving motor and the mounting hole along the axial direction of the driving device.

[0071] By fixing the annular shield on the inner surface of the housing along the axial direction of the driving device and towards the rotor of the driving motor, and penetrating the motor shaft by the through hole of the annular shield, and then fixing the stator of the resolver by the annular shield, the resolver is fixed between the rotor of the driving motor and the housing, so that the resolver and the annular shield do not occupy additional axial space outside the driving motor, and the annular shield can shield the magnetic field of the stator of the driving motor from interfering with the signal quality of the resolver, so that the driving device can install the resolver and the annular shield in the space between the rotor of the driving motor and the inner surface of the housing along the axial direction of the driving device, and the resolver will not be interfered by the driving motor.

[0072] Figure 1is a schematic view of an electric vehicle 1 provided by an embodiment of the present application, Figure 2 is a schematic view of a driving device 20 provided by an embodiment of the present application, Figure 3 is another schematic view of the driving device 20 provided by an embodiment of the present application.

[0073] In an embodiment, the electric vehicle 1 comprises a frame 10 and a driving device 20, as shown in Figure 1 and Figure 2 The frame 10 is configured to fix the driving device 20, and the driving device 20 is configured to drive a wheel 30. In an embodiment of the present application, the electric vehicle 1 refers to a wheeled device driven or pulled by a power device. In an embodiment, the driving device 20 is a driving motor 100. In an embodiment, the driving device 20 comprises a power supply device 200, the driving motor 100 and a reducer 300, and the driving device 20 can also be referred to as a power assembly or a multi-in-one power assembly. The power supply device 200 comprises at least one of a motor controller, an on-board charger, a vehicle controller and a power distribution device. In an embodiment, the driving device 20 comprises two driving motors 100 and two reducers 300, and the driving device 20 can also be referred to as a dual-motor power assembly.

[0074] In an embodiment, the driving device 20 comprises the power supply device 200, the driving motor 100 and the reducer 300, as shown in Figure 1 and Figure 2 In an embodiment of the present application, the power supply device 200 supplies power to the driving motor 100, the power supply device 200 receives high-voltage direct current delivered by a power battery 40 of the electric vehicle 1, and converts the high-voltage direct current into high-voltage alternating current to deliver to the driving motor 100 to drive the driving motor 100 to rotate. The driving motor 100 is drivingly connected to the reducer 300, and the driving motor 100 drives the reducer 300 to rotate. In an embodiment of the present application, the driving device 20 can also be referred to as a power assembly.

[0075] In an embodiment of the present application, the driving motor 100 comprises a motor shaft 110, a stator 120 and a rotor 130, as shown in Figure 2 and Figure 3 The reducer 300 comprises a gear set (not shown), an input shaft (not shown) and an output shaft (not shown). The rotor 130 in the driving motor 100 is fixedly sleeved on the motor shaft 110, and the stator 120 drives the rotor 130 to rotate after receiving alternating current, thereby driving the motor shaft 110 to rotate. The motor shaft 110 of the driving motor 100 is drivingly connected to the input shaft of the reducer 300, the input shaft receives power transmitted by the motor shaft 110 of the driving motor 100 and transmits the power to the output shaft through the gear assembly, and the output shaft drives the wheel 30 of the electric vehicle 1 to travel.

[0076] In an embodiment, the driving motor 100 comprises a motor shaft 110, a stator 120 and a rotor 130, as shown in Figure 2and Figure 3 As shown, the drive unit 20 includes a rotary transformer 400 and a shield (not shown). The rotary transformer 400 senses the position and speed of the rotor 130 of the drive motor 100 and converts this information into signals that are fed back to the motor controller in the power supply unit 200, enabling the motor controller to monitor the position and speed of the rotor 130 of the drive motor 100 in real time. The shield is used to shield the rotary transformer 400 from interference caused by components inside the drive unit 20.

[0077] In current drive motors, the shield and rotary transformer are usually located on the end cover side of the drive motor, which makes the axial dimension of the drive motor larger, and also makes the axial dimension of the powertrain larger.

[0078] In this embodiment, by fixing the annular shield between the housing of the drive device and the rotor of the drive motor, and then using the annular shield to fix the stator of the rotary transformer, the rotary transformer is not affected by the interference generated by the drive motor. At the same time, the drive device can fully utilize the axial space between the rotor of the drive motor and the inner surface of the housing to install the rotary transformer and the annular shield, thereby improving the detection accuracy of the rotary transformer and reducing the axial dimension of the drive device.

[0079] The driving device 20 provided in the embodiments of this application will be described in detail below.

[0080] Figure 4 This is another schematic diagram of the driving device 20 provided in the embodiments of this application. Figure 5 This is a schematic diagram of a rotary transformer 400 and annular shield 600 provided in an embodiment of this application. Figure 6 This is a schematic diagram of a rotary transformer 400 provided in an embodiment of this application. Figure 7 This is a schematic diagram of an annular shield 600 provided in an embodiment of this application.

[0081] In one embodiment, such as Figure 3 As shown, a housing 500 of a drive device 20 is used to fix the stator 120 of a drive motor 100 and to house the rotor 130 of the drive motor 100. The housing 500 includes a mounting hole 510, which extends through the housing 500 along the axial direction of the drive device 20. The motor shaft 110 of the drive motor 100 passes through the mounting hole 510. Wherein, as Figures 3 to 7As shown, the inner surface 520 of the housing 500 of the drive device 20 towards the rotor 130 of the drive motor 100 is used to fix the annular shield 600, the annular shield 600 is used to fix the stator 410 of the rotary transformer 400, the rotor 420 of the rotary transformer 400 is fixed to the motor shaft 110, the annular shield 600 comprises a through hole 610, the through hole 610 is used to pass through the motor shaft 110, the stator 410 of the rotary transformer 400 and the annular shield 600 are arranged between the rotor 130 of the drive motor 100 and the mounting hole 510 along the axial direction O of the drive device 20.

[0082] In the embodiment of the present application, the inner surface 520 of the housing 500 of the drive device 20 towards the rotor 130 of the drive motor 100 is used to fix the annular shield 600, the annular shield 600 is used to fix the stator 410 of the rotary transformer 400, the rotor 420 of the rotary transformer 400 is fixed to the motor shaft 110, the annular shield 600 comprises a through hole 610, the through hole 610 is used to pass through the motor shaft 110, the annular shield 600 passes through the motor shaft 110, so that the annular shield 600 does not need to additionally occupy the space along the axial direction O of the drive device 20, which is beneficial to reduce the axial length O of the drive device 20. The position where the stator 410 of the rotary transformer 400 is fixed to the housing 500 can not be a plane, compared with directly fixing the stator 410 of the rotary transformer 400 to the housing 500, fixing the stator 410 of the rotary transformer 400 by using the annular shield 600 can make the installation and dismounting of the stator 410 of the rotary transformer 400 more convenient, and is also more beneficial to the isolation of the rotary transformer 400 from the drive motor 100 by the annular shield 600, and makes the structure of the housing 500 simpler. The rotor 420 of the rotary transformer 400 is fixed to the motor shaft 110, and the through hole 610 of the annular shield 600 passes through the motor shaft 110, which makes the installation and fixation of the rotary transformer 400 and the annular shield 600 more convenient and simplifies the assembly process.

[0083] In the embodiment of the present application, the stator 410 of the rotary transformer 400 and the annular shield 600 are arranged between the rotor 130 of the drive motor 100 and the mounting hole 510 along the axial direction O of the drive device 20, so that the annular shield 600 can isolate the rotary transformer 400 from the drive motor 100 along the axial direction O of the drive device 20, which can improve the signal quality output by the rotary transformer 400 and is more beneficial to the real-time monitoring and control of the motor controller to the drive motor 100.

[0084] In one embodiment, the annular shield 600 is made of high magnetic permeability material, so that the magnetic lines generated by the drive motor 100 flow into the annular shield 600 when flowing to the vicinity of the rotary transformer 400, thereby avoiding the magnetic lines from interfering with the magnetic lines of the stator 410 of the rotary transformer 400.

[0085] In this embodiment, by fixing the annular shield 600 to the inner surface 520 of the housing 500 along the axial direction O of the drive device 20 toward the rotor 130 of the drive motor 100, and fixing the through hole 610 of the annular shield 600 through the motor shaft 110, and then fixing the stator 410 of the rotary transformer 400 with the annular shield 600, the rotary transformer 400 is not affected by the interference generated by the drive motor 100 along the axial direction O of the drive device 20. This allows the drive device 20 to install the rotary transformer 400 and the annular shield 600 by making full use of the space between the rotor 130 of the drive motor 100 and the inner surface 520 of the housing 500 along the axial direction O of the drive device 20. This reduces the axial length of the drive device 20.

[0086] In one embodiment, such as Figure 3 As shown, the surface of the annular shield 600 facing the rotor 130 of the drive motor 100 along the axial direction O of the drive device 20 is used to fix the stator 410 of the rotary transformer 400, so that the rotary transformer 400 can be installed on the annular shield 600 along the axial direction O of the drive device 20 from the direction away from the housing 500. Specifically, the housing 500 includes a motor slot 570 and a motor end cover 580. The motor end cover 580 is used to enclose the slot opening of the motor slot 570 to form a motor cavity 540. The mounting holes 510 are distributed at the bottom of the slot of the motor slot 570. The annular shield 600 is inserted into the motor slot 570 from the slot opening and fixed to the bottom of the motor slot 570. Then the rotary transformer 400 is inserted into the motor slot 570 from the slot opening and fixed to the annular shield 600, which makes it easier to install the rotary transformer 400.

[0087] In one embodiment, the annular shield 600 along the axial direction O of the drive device 20, facing away from the rotor 130 of the drive motor 100, is used to fix the stator 410 of the rotary transformer 400. This allows the annular shield 600 and the housing 500 to shield the drive motor 100 from magnetic field interference from both sides of the rotary transformer 400, thereby improving the signal transmission quality of the rotary transformer 400. In another embodiment, the annular shield 600 and the housing 500 enclose a shielding cavity, within which the rotary transformer 400 is located.

[0088] In one embodiment, such as Figure 4As shown, mounting holes 510 are distributed on the motor end cover 580, and the annular shield 600 is fixed to the motor end cover 580. Along the axial direction O of the drive device 20, the motor end cover 580, the annular shield 600, the rotary transformer 400, and the rotor 130 of the drive motor 100 are arranged in sequence. This allows the annular shield 600 and the rotary transformer 400 to be fixedly installed on the motor end cover 580 first, and then assembled with the motor slot 570 and the motor shaft 110 of the drive motor 100, making the installation of the annular shield 600 and the rotary transformer 400 simple.

[0089] Figure 8 This is a cross-sectional view of the rotary transformer 400 and the annular shield 600 provided in the embodiments of this application.

[0090] In one embodiment, such as Figure 7 As shown, the annular shield 600 is used to fix at least one fastener 700, and the at least one fastener 700 is distributed around the periphery of the through hole 610, as shown. Figure 3 and Figure 8 As shown, each fixing member 700 protrudes along the axial direction of the drive device 20 from the annular shield 600. Each fixing member 700 is used to fix the stator 410 of the rotary transformer 400 and to isolate the gap formed between the stator 410 of the rotary transformer 400 and the annular shield 600.

[0091] In this embodiment of the application, at least one fastener 700 is distributed around the through hole 610. The at least one fastener 700 is used to fix the stator 410 of the rotary transformer 400, so that the stator 410 of the rotary transformer 400 can be more firmly fixed to the annular shield 600.

[0092] In this embodiment, each fixing member 700 protrudes from the annular shield 600, thereby isolating the stator 410 of the rotary transformer 400 from the annular shield 600, preventing the stator 410 of the rotary transformer 400 from direct contact with the annular shield 600. This allows an air gap to be formed between the annular shield 600 and the stator 410 of the rotary transformer 400, achieving air isolation between the stator 410 of the rotary transformer 400 and the annular shield 600. This prevents the annular shield 600 from receiving and transmitting the magnetic lines of force generated by the drive motor 100 to the stator 410 of the rotary transformer 400, enabling the rotary transformer 400 to output a high-quality signal.

[0093] In one embodiment, the surface of the annular shield 600 facing the rotor 130 of the drive motor 100 along the axial direction O of the drive device 20 is used to fix the stator 410 of the rotary transformer 400, and the surface of the annular shield 600 facing the rotor 130 of the drive motor 100 is used to fix at least one fastener 700, and each fastener 700 protrudes from the annular shield 600 towards the rotor 130 of the drive motor 100 along the axial direction O of the drive device 20.

[0094] In one embodiment, the surface of the annular shield 600 facing away from the rotor 130 of the drive motor 100 along the axial direction O of the drive device 20 is used to fix the stator 410 of the rotary transformer 400. The surface of the annular shield 600 facing away from the rotor 130 of the drive motor 100 is used to fix at least one fixing member 700. Each fixing member 700 protrudes from the annular shield 600 facing away from the rotor 130 of the drive motor 100 along the axial direction O of the drive device 20.

[0095] In one embodiment, the magnetic permeability of at least one fastener 700 is less than the magnetic permeability of the annular shield 600.

[0096] In the embodiments of this application, such as Figure 3 and Figure 8 As shown, the fixing member 700 is used to fix the stator 410 of the rotary transformer 400. The magnetic permeability of the fixing member 700 is less than that of the annular shield 600. This prevents the magnetic lines of force generated by the drive motor 100 from flowing into the stator 410 of the rotary transformer 400 from flowing through the fixing member 700 when they flow into the annular shield 600. This reduces the interference of the magnetic lines of force generated by the drive motor 100 with the magnetic lines of force of the stator 410 of the rotary transformer 400, thereby reducing the interference with the magnetic field of the rotary transformer 400. This helps to ensure the accuracy of the rotary transformer 400 in detecting the position and speed information of the rotor 130 of the drive motor 100.

[0097] In one embodiment, such as Figure 8 As shown, the annular shield 600 is made of a material with high magnetic permeability, while the fastener 700 is made of a material with low magnetic permeability. In one embodiment, the annular shield 600 is made of steel, and the fastener 700 is made of aluminum.

[0098] In one embodiment, such as Figure 7 and Figure 8 As shown, at least one fastener 700 includes three fasteners 700, which are evenly distributed around the through hole 610, so that the stator 410 of the rotary transformer 400 can be more firmly fixed to the annular shield 600.

[0099] In one embodiment, such as Figure 7As shown, the annular shield 600 further comprises a clearance groove 620, which is arranged around the circumferential side of the through hole 610, such as Figure 3 and Figure 7 As shown, the clearance groove 620 is arranged between the at least one fixing member 700 and the through hole 610 along the radial direction R of the driving device 20. Figure 6 and Figure 8 As shown, the stator 410 of the rotary transformer 400 comprises a stator protrusion 411 protruding towards the annular shield 600 along the axial direction O of the driving device 20, and the clearance groove 620 is used to accommodate the stator protrusion 411 of the rotary transformer 400. Figure 7 As shown, the clearance groove 620 is arranged between the at least one fixing member 700 and the through hole 610 along the radial direction R of the driving device 20.

[0100] In the embodiment of the present application, the inner surface 520 of the shell 500 facing the rotor 130 of the driving motor 100 along the axial direction O of the driving device 20 is used to fix the annular shield 600, and the clearance groove 620 of the annular shield 600 faces away from the inner surface 520 of the shell 500 along the axial direction O of the driving device 20, so that the stator 410 of the rotary transformer 400 can be installed from the direction facing away from the inner surface 520 of the shell 500 of the shell 500 along the axial direction O of the driving device 20, which is convenient for installation.

[0101] In the embodiment of the present application, the clearance groove 620 faces away from the inner surface 520 of the shell 500 along the axial direction O of the driving device 20, and the stator 410 of the rotary transformer 400 comprises a stator protrusion 411 protruding towards the annular shield 600 along the axial direction O of the driving device 20, so that the clearance groove 620 can be used to accommodate the stator protrusion 411 of the rotary transformer 400, and thus the stator protrusion 411 will not directly contact the annular shield 600 when the stator 410 of the rotary transformer 400 is fixed on the annular shield 600 by the at least one fixing member 700, and the magnetic lines generated by the driving motor 100 received by the annular shield 600 will not be conducted to the rotary transformer 400 from the stator protrusion 411.

[0102] In the embodiment of the present application, the clearance groove 620 is arranged between the at least one fixing member 700 and the through hole 610 along the radial direction R of the driving device 20, so that the installation and fixation of the stator protrusion 411 will not be interfered by the fixing member 700, and the stator protrusion 411 will not pass through the through hole 610 of the annular shield 600 to a position outside the annular shield 600, so that the driving motor 100 can be prevented from interfering with the stator protrusion 411, and the detection accuracy of the rotary transformer 400 is ensured.

[0103] In one embodiment, asFigure 6 and Figure 7 As shown, the inner diameter of the through hole 610 is larger than the outer diameter of the rotor 420 of the rotary transformer 400 and smaller than the inner diameter of the stator 410 of the rotary transformer 400.

[0104] In the embodiments of this application, such as Figure 3 , Figure 6 and Figure 7 As shown, the inner diameter of the through hole 610 is smaller than the inner diameter of the stator 410 of the rotary transformer 400, so that the annular shield 600 completely shields the rotary transformer 400 in the radial direction R of the drive device 20, improving the anti-interference of the rotary transformer 400 by the annular shield 600. The inner diameter of the through hole 610 is larger than the outer diameter of the rotor 420 of the rotary transformer 400, so that there is space between the rotor 420 of the rotary transformer 400 and the annular shield 600, forming an air isolation between the rotor 420 of the rotary transformer 400 and the annular shield 600, preventing the magnetic lines flowing into the annular shield 600 from interfering with the magnetic lines between the rotor 420 and the stator 410 of the rotary transformer 400. The inner diameter of the through hole 610 is larger than the outer diameter of the rotor 420 of the rotary transformer 400 but smaller than the inner diameter of the stator 410 of the rotary transformer 400. This allows the annular shield 600 to better isolate the stator 410 and rotor 420 of the rotary transformer 400 from the drive motor 100 along the radial R direction of the drive device 20, which is more conducive to the rotary transformer 400 detecting and transmitting accurate position and speed information of the rotor 130 of the drive motor 100. The larger inner diameter of the through hole 610 also makes it easier and smoother for the rotor 420 of the rotary transformer 400 to pass through the through hole 610.

[0105] In one embodiment, such as Figure 3 As shown, the stator 120 of the drive motor 100 includes a stator core 121 and a stator winding 122. The stator winding 122 is fixed to the stator core 121. The stator winding 122 includes a winding end 1221. Along the axial direction O of the drive device 20, the winding end 1221 is exposed on the side of the stator core 121 facing the mounting hole 510. Along the radial direction R of the drive device 20, the stator 410 of the rotary transformer 400 and the annular shield 600 are distributed inside the winding end 1221.

[0106] In the embodiments of this application, such as Figure 3 and Figure 5As shown, the stator winding 122 includes winding end portions 1221 exposed to one side of the stator core 121 toward the mounting hole 510 along the axial direction O of the drive device 20, so that the inside of the winding end portions 1221 of the stator winding 122 along the radial direction R of the drive device 20 has space to accommodate the stator 410 of the rotary transformer 400 and the annular shield 600, and the stator 410 of the rotary transformer 400 and the annular shield 600 are closer to the stator core 121, which is conducive to making the axial direction O of the drive device 20 more compact, thereby reducing the axial direction O volume of the drive device 20.

[0107] In the embodiment of the present application, the stator 410 of the rotary transformer 400 and the annular shield 600 are distributed on the inside of the winding end portions 1221 along the radial direction R of the drive device 20, so that the stator 410 of the rotary transformer 400 and the annular shield 600 can be arranged within the envelope of the winding end portions 1221, making full use of the axial space within the winding end portions 1221, which is conducive to reducing the axial direction O space of the drive device 20. It can also make the drive device 20 use the annular shield 600 to axially isolate the drive motor 100 from the stator 410 of the rotary transformer 400 in the case of smaller axial size, and guarantee the detection accuracy of the rotary transformer 400. When the stator 410 of the rotary transformer 400 is distributed on the inside of the winding end portions 1221 along the radial direction R of the drive device 20, the stator 410 of the rotary transformer 400 is more disturbed by the winding end portions 1221, and the annular shield 600 is more needed for isolation, so the annular shield 600 also needs to be arranged on the inside of the winding end portions 1221.

[0108] Figure 9 is another schematic diagram of the drive device 20 provided by the embodiment of the present application.

[0109] In one embodiment, as shown in Figure 9 the inside surface 520 of the housing 500 toward the rotor 130 of the drive motor 100 along the axial direction O of the drive device 20 includes a fixed protrusion 530, the fixed protrusion 530 protrudes toward the rotor 130 of the drive motor 100 along the axial direction O of the drive device 20, the mounting hole 510 penetrates the fixed protrusion 530, the surface of the fixed protrusion 530 along the axial direction O of the drive device 20 toward the rotor 130 of the drive motor 100 is used to fix the annular shield 600, and the surface of the annular shield 600 along the axial direction O of the drive device 20 toward the rotor 130 of the drive motor 100 is used to fix the stator 410 of the rotary transformer 400.

[0110] In the embodiment of the present application, the inner surface 520 of the housing 500 towards the rotor 130 of the driving motor 100 along the axial direction O of the driving device 20 comprises a fixing protrusion 530, the fixing protrusion 530 protrudes towards the rotor 130 of the driving motor 100 along the axial direction O of the driving device 20, which makes it more convenient to fix the annular shield 600 on the inner surface 520 of the housing 500 through the fixing protrusion 530, and simplifies the installation process.

[0111] In the embodiment of the present application, the fixing hole 510 penetrates the fixing protrusion 530, so that the motor shaft 110 of the driving motor 100 can also penetrate the fixing protrusion 530.

[0112] In the embodiment of the present application, the fixing protrusion 530 along the axial direction O of the driving device 20 towards the surface of the rotor 130 of the driving motor 100 is used for fixing the annular shield 600, so that the annular shield 600 can be arranged between the fixing protrusion 530 and the rotor 130 of the driving motor 100, and also makes the magnetic force lines conducted by the annular shield 600 can be conducted to the housing 500 through the fixing protrusion 530.

[0113] In the embodiment of the present application, the surface of the annular shield 600 along the axial direction O of the driving device 20 towards the rotor 130 of the driving motor 100 is used for fixing the stator 410 of the rotary transformer 400, so that the annular shield 600 can be fixed between the stator 410 of the rotary transformer 400 and the fixing protrusion 530, thereby both isolating the annular shield 600 from the axial interference of the winding end 1221 on the stator 410 of the rotary transformer 400 and making the annular shield 600 conduct the magnetic force lines out through the fixing protrusion 530.

[0114] In one embodiment, as shown in Figure 7 the annular shield 600 comprises an annular protrusion 630, the annular protrusion 630 protrudes along the axial direction O of the driving device 20, as shown in Figure 5 the inner side of the annular protrusion 630 along the radial direction R of the driving device 20 is used for accommodating the stator 410 of the rotary transformer 400, the inner diameter of the annular protrusion 630 is greater than the outer diameter of the stator 410 of the rotary transformer 400, as shown in Figure 9 the outer diameter of the annular protrusion 630 is smaller than the inner diameter of the winding end 1221.

[0115] In the embodiment of the present application, the annular protrusion 630 protrudes along the axial direction O of the driving device 20, the inner diameter of the annular protrusion 630 is greater than the outer diameter of the stator 410 of the rotary transformer 400, the inner side of the annular protrusion 630 along the radial direction R of the driving device 20 is used to accommodate the stator 410 of the rotary transformer 400, so that the stator 410 of the rotary transformer 400 can be completely arranged in the annular protrusion 630 of the annular shield 600 along the radial direction R of the driving device 20, so that the annular protrusion 630 can isolate the magnetic field interference of the winding end 1221 on the stator 410 of the rotary transformer 400 along the radial direction R of the driving device 20. Also, when the stator 410 of the rotary transformer 400 is fixed in the annular shield 600, the annular shield 600 can envelope the stator 410 of the rotary transformer 400, so that the annular shield 600 can also protect the stator 410 of the rotary transformer 400, so that the stator 410 of the rotary transformer 400 can be protected along the axial direction O and the radial direction R of the driving device 20.

[0116] In the embodiment of the present application, as shown in Figure 9 , the outer diameter of the annular protrusion 630 is denoted as L1, and the inner diameter of the winding end 1221 is denoted as L2, L1 < L2, so that the volume of the annular shield 600 is not too large, so that the annular shield 600 can be arranged in the winding end 1221 along the radial direction R and the axial direction O of the driving device 20, so as to realize that the annular shield 600 can isolate the winding end 1221 and the stator 410 of the rotary transformer 400 along the axial direction O and the radial direction R of the driving device 20 while reducing the axial size of the driving device 20, which is beneficial to the rotary transformer 400 to accurately detect the position and speed information of the rotor 130 of the driving motor 100.

[0117] In one embodiment, as shown in Figure 7 , the annular shield 600 further comprises a threading hole 640, the threading hole 640 penetrates the annular shield 600 along the axial direction O of the driving device 20, as shown in Figures 5 to 7 , the threading hole 640 is used to pass the connecting line 430 of the rotary transformer 400 and the motor controller, the spacing between the threading hole 640 and the motor shaft 110 axis along the radial direction R of the driving device 20 is greater than the outer diameter of the stator 410 of the rotary transformer 400, as shown in Figure 7 , the threading hole 640 is arranged between the annular protrusion 630 and the through hole 610 along the radial direction R of the driving device 20.

[0118] In the embodiment of the present application, the annular shield 600 comprises the annular protrusion 630, so that the connection line 430 of the rotary transformer 400 and the motor controller is not convenient to pass out of the annular shield 600 along the radial direction R of the drive device 20, the threading hole 640 is arranged through the annular shield 600 along the axial direction O of the drive device 20, so that the connection line 430 of the rotary transformer 400 and the motor controller can pass through the threading hole 640 along the axial direction O of the drive device 20.

[0119] In the embodiment of the present application, the distance between the threading hole 640 along the radial direction R of the drive device 20 and the motor shaft 110 axis is greater than the outer diameter of the stator 410 of the rotary transformer 400, so that the annular shield 600 not only has space to accommodate the stator 410 of the rotary transformer 400, but also has space to accommodate the connection line 430 of the rotary transformer 400 and the motor controller, and the connection line 430 of the rotary transformer 400 and the motor controller has sufficient space to pass out of the threading hole 640.

[0120] In the embodiment of the present application, the threading hole 640 along the radial direction R of the drive device 20 is arranged between the annular protrusion 630 and the through hole 610, so that the annular protrusion 630 can also isolate the connection line 430 of the rotary transformer 400 and the motor controller, which is conducive to transmitting accurate signals from the rotary transformer 400 to the motor controller.

[0121] In one embodiment, as shown in Figure 7 The annular protrusion 630 comprises the anti-collision section 631, the length of the anti-collision section 631 along the axial direction O of the drive device 20 is greater than the length of other parts of the annular protrusion 630, and the threading hole 640 is arranged between the anti-collision section 631 and the through hole 610.

[0122] In the embodiment of the present application, as shown in Figure 5 and Figure 9 The axial length of the connection line 430 of the rotary transformer 400 and the motor controller is relatively long, the length of the anti-collision section 631 along the axial direction O of the drive device 20 is set to be greater than the length of other parts of the annular protrusion 630, which is conducive to the anti-collision protection of the anti-collision section 631 to the connection line 430 of the rotary transformer 400 and the motor controller, and is conducive to avoiding the winding end 1221 from colliding with the connection line 430 of the rotary transformer 400 and the motor controller along the radial direction R of the drive device 20 during assembly, and is conducive to ensuring that the detection signal of the rotary transformer 400 can be transmitted to the motor controller in real time.

[0123] In the embodiment of the present application, the threading hole 640 is arranged between the anti-collision section 631 and the through hole 610, so that the connection line 430 of the rotary transformer 400 and the motor controller passing through the threading hole 640 is arranged between the anti-collision section 631 and the through hole 610, so that the anti-collision section 631 can also isolate the interference of the winding end 1221 to the connection line 430 of the rotary transformer 400 and the motor controller in the radial R direction of the driving device 20, which is beneficial to accurately transmitting the signal of the rotary transformer 400 and the motor controller to the motor controller.

[0124] In an embodiment, the overall thickness of the annular shielding cover 600 in the axial O and radial R directions of the driving device 20 is greater than or equal to 1.5 mm, so that the annular shielding cover 600 can shield the magnetic field interference of the driving motor 100. If the thickness is too thin, the shielding effect will be poor, and if the thickness is too thick, the weight of the annular shielding cover 600 will be heavier, and the axial space and radial space occupied will be larger, which is not conducive to assembly.

[0125] Figure 10 is a schematic view of the driving device 20 provided by another embodiment of the present application.

[0126] In an embodiment, as shown in Figure 10 , the housing 500 of the driving device 20 includes a motor cavity 540 and a reducer cavity 550, the motor cavity 540 is used to accommodate the stator 120 of the driving motor 100 and the rotor 130 of the driving motor 100, the reducer cavity 550 is used to accommodate the pinion shaft of the reducer 300, the motor cavity 540 and the reducer cavity 550 are arranged in the axial O direction of the driving device 20, the mounting hole 510 is used to communicate the motor cavity 540 and the reducer cavity 550, and the motor shaft 110 of the driving motor 100 is used to drive the wheel 30 through the pinion shaft of the reducer 300.

[0127] In this embodiment, the motor cavity 540 and the reducer cavity 550 are arranged along the axial direction O of the drive device 20. The mounting hole 510 is used to connect the motor cavity 540 and the reducer cavity 550. The motor shaft 110 of the drive motor 100 passes through the mounting hole 510. The stator 410 of the rotary transformer 400 is fixed to the motor shaft 110. Along the axial direction O of the drive device 20, the stator 410 of the rotary transformer 400 and the annular shield 600 are arranged between the rotor 130 of the drive motor 100 and the mounting hole 510. This arrangement allows the space between the motor cavity 540 and the reducer cavity 550 to be utilized, ensuring that the arrangement of the annular shield 600 and the rotary transformer 400 does not additionally occupy the space of the housing 500 of the drive device 20 along the axial direction O of the drive device 20. This is beneficial for isolating the drive motor 100 from the rotary transformer 400 when the axial dimension of the drive device 20 is small, thus ensuring the normal operation of the rotary transformer 400. In the embodiments of this application, the drive device 20 may also be referred to as a powertrain.

[0128] In one embodiment, such as Figure 10 As shown, the housing 500 of the drive device 20 also includes a bearing groove 560, which is used to fix the outer ring of the bearing 561. The inner ring of the bearing 561 is fixed to the motor shaft 110. The groove opening of the bearing groove 560 is away from the inner surface 520 of the annular shield 600 fixed to the housing 500 along the axial direction O of the drive device 20. The bearing groove 560 is recessed towards the rotor 130 of the drive motor 100 along the axial direction O of the drive device 20. The mounting hole 510 connects the motor cavity 540 and the bearing groove 560.

[0129] In this embodiment, the opening of the bearing groove 560 is away from the inner surface 520 of the fixed annular shield 600 along the axial direction O of the drive device 20. The bearing groove 560 is recessed towards the rotor 130 of the drive motor 100 along the axial direction O of the drive device 20. The inner surface 520 of the housing 500 towards the rotor 130 of the drive motor 100 along the axial direction O of the drive device 20 includes a fixing protrusion 530. The fixing protrusion 530 is oriented towards the rotor 130 of the drive motor 100 along the axial direction O of the drive device 20. The mounting hole 510 penetrates the fixed protrusion 530, so that the bearing groove 560 can be opened on the side of the fixed protrusion 530 away from the rotor 130 of the drive motor 100 along the axial direction O of the drive device 20. Along the radial direction R of the drive device 20, the bearing groove 560 is located inside the fixed protrusion 530, so that the distance between the bearing groove 560 and the annular shield 600 fixed by the fixed protrusion 530 is smaller, which is more conducive to making the axial dimension O of the drive device 20 smaller and is conducive to the miniaturization of the drive device 20.

[0130] In an embodiment, the motor shaft 110 of the driving motor 100 is transmissionally connected to an input shaft in the pinion shaft of the speed reducer 300, the motor shaft 110 of the driving motor 100 is arranged in the input shaft of the speed reducer 300, the annular shield 600 and the stator 410 of the rotary transformer 400 are fixed to the motor shaft 110 of the driving motor 100, and the inner ring of the bearing 561 is fixed to the input shaft of the speed reducer 300. In an embodiment, the motor shaft 110 of the driving motor 100 and the input shaft of the speed reducer 300 are integrated shafts, and the structural strength is stronger.

[0131] Figure 11 is a schematic diagram of the driving device 20 provided by another embodiment of the present application.

[0132] In an embodiment, as shown in Figure 11 the driving device 20 includes two driving motors 100, two speed reducers 300, two rotary transformers 400, and two annular shields 600, the driving device 20 includes two housings 500 and a partition plate 800, the two housings 500 are arranged on two sides of the partition plate 800 along the axial direction O of the driving device 20, and the speed reducer cavities 550 of the two housings 500 are arranged between the motor cavities 540 of the two housings 500. The spacing between the two annular shields 600 along the axial direction O of the driving device 20 is less than the spacing between the stators 410 of the two rotary transformers 400 fixed by the two annular shields 600.

[0133] In an embodiment of the present application, the spacing between the two annular shields 600 along the axial direction O of the driving device 20 is denoted as L3, the spacing between the stators 410 of the two rotary transformers 400 fixed by the two annular shields 600 is denoted as L4, and L3 < L4, so that the two annular shields 600 can be arranged in the two housings 500 on the two sides of the partition plate 800 along the axial direction O of the driving device 20, respectively, and then the stators 410 of the two rotary transformers 400 are fixed by the two annular shields 600, respectively, so that the arrangement of the two annular shields 600 and the two rotary transformers 400 can make full use of the axial space between the speed reducer cavities 550 and the motor cavities 540 in the two housings 500, which is beneficial to make the driving device 20 have a smaller axial size, and still use the annular shield 600 to isolate the winding end 1221 of the driving motor 100 from the rotary transformer 400, so as to ensure the normal operation of the two rotary transformers 400, so that the motor controller can receive accurate position and speed signals of the rotor 130 of the driving motor 100. In an embodiment of the present application, the driving device 20 can also be referred to as a double-motor power assembly.

[0134] In an embodiment, as shown in Figure 11As shown, the stator 120 of each driving motor 100 comprises a stator core 121 and a stator winding 122, the stator winding 122 is fixed to the stator core 121, the stator winding 122 comprises winding ends 1221 exposed at both ends of the stator core 121, the stator 410, the rotor 420 and the annular shield 600 of the rotary transformer 400 are distributed at the inner side of the winding ends 1221 along the radial direction R of the driving device 20. The interval of the two annular shields 600 along the axial direction O of the driving device 20 is greater than the interval of the winding ends 1221 of the two driving motors 100 towards one end of the reducer cavity 550.

[0135] In the embodiment of the present application, the stator 410, the rotor 420 and the annular shield 600 of the rotary transformer 400 are distributed at the inner side of the winding ends 1221 along the radial direction R of the driving device 20, so that the arrangement of the stator 410, the rotor 420 and the annular shield 600 of the rotary transformer 400 can make full use of the space of the winding ends 1221 of the stator 120 of each driving motor 100 along the axial direction O of the driving device 20, which is conducive to reducing the axial O size of the driving device 20. Also, the driving device 20 can use the annular shield 600 to axially isolate the winding ends 1221 of the driving motor 100 from the rotary transformer 400 in the case of small axial size, which guarantees the detection accuracy of the rotary transformer 400.

[0136] In the embodiment of the present application, the interval of the two annular shields 600 along the axial direction O of the driving device 20 is L3, the interval of the winding ends 1221 of the two driving motors 100 towards one end of the reducer cavity 550 is L5, L3>L5, so that the stators 410 of the two rotary transformers 400 fixed by the two annular shields 600 can be arranged within the winding ends 1221 of the two driving motors 100 towards one end of the reducer cavity 550 along the radial direction R of the driving device 20, so that the arrangement of the two annular shields 600 does not additionally occupy the axial O space of the driving device 20, and also, the driving device 20 can axially and radially isolate the winding ends 1221 of the two driving motors 100 from the two rotary transformers 400 through the two annular shields 600 in the case of small axial size, which guarantees the detection accuracy of the two rotary transformers 400.

[0137] The driving device and the electric vehicle provided by the embodiments of the present application are described in detail above, and the principles and embodiments of the present application are described by applying specific examples in this paper; the above description of the embodiments is only used to help understand the method and its core idea of the present application; meanwhile, for those skilled in the art, the specific embodiments and application range can be changed according to the idea of the present application, and the above description of the present application should not be understood as a limitation.

Claims

1. A drive device characterized by comprising: The housing of the drive device is used to fix the stator of the drive motor and accommodate the rotor of the drive motor, the housing comprises a mounting hole, the mounting hole penetrates the housing along the axial direction of the drive device, the motor shaft of the drive motor penetrates the mounting hole, wherein: The inner surface of the housing towards the rotor of the drive motor along the axial direction of the drive device is used to fix an annular shield, the annular shield is used to fix the stator of the rotary transformer, the rotor of the rotary transformer is fixed to the motor shaft, the annular shield comprises a through hole, the through hole is used to penetrate the motor shaft, the stator of the rotary transformer and the annular shield are arranged between the rotor of the drive motor and the mounting hole along the axial direction of the drive device.

2. The drive apparatus according to claim 1, characterized by The annular shield is used to fix at least one fixing member, the at least one fixing member is distributed around the through hole, each fixing member protrudes from the annular shield along the axial direction of the drive device, each fixing member is used to fix the stator of the rotary transformer and isolate the stator of the rotary transformer and the annular shield to form a gap.

3. The drive apparatus according to claim 2, characterized by The magnetic permeability of the at least one fixing member is less than the magnetic permeability of the annular shield.

4. The drive apparatus according to claim 2, characterized by The annular shield further comprises a clearance groove, the clearance groove surrounds the periphery of the through hole, the groove opening of the clearance groove faces away from the inner surface of the housing along the axial direction of the drive device, the stator of the rotary transformer comprises a stator protrusion protruding towards the annular shield along the axial direction of the drive device, the clearance groove is used to accommodate the stator protrusion of the rotary transformer, the clearance groove is arranged between the at least one fixing member and the through hole along the radial direction of the drive device.

5. Drive arrangement according to any of claims 1-4, characterized in that The inner diameter of the through hole is greater than the outer diameter of the rotor of the rotary transformer and less than the inner diameter of the stator of the rotary transformer.

6. Drive arrangement according to any of claims 1-5, characterized in that The stator of the drive motor comprises a stator core and a stator winding, the stator winding is fixed to the stator core, the stator winding comprises a winding end portion, the winding end portion is exposed to one side of the stator core towards the mounting hole along the axial direction of the drive device, the stator of the rotary transformer and the annular shield are distributed inside the winding end portion along the radial direction of the drive device.

7. The drive apparatus according to claim 6, characterized by The inner surface of the housing towards the rotor of the drive motor along the axial direction of the drive device comprises a fixing protrusion, the fixing protrusion protrudes towards the rotor of the drive motor along the axial direction of the drive device, the mounting hole penetrates the fixing protrusion, the surface of the fixing protrusion towards the rotor of the drive motor along the axial direction of the drive device is used to fix the annular shield, the surface of the annular shield towards the rotor of the drive motor along the axial direction of the drive device is used to fix the stator of the rotary transformer.

8. The drive apparatus according to claim 6, characterized by The annular shield comprises an annular protrusion, the annular protrusion protrudes along the axial direction of the drive device, the inner side of the annular protrusion is used to accommodate the stator of the rotary transformer along the radial direction of the drive device, the inner diameter of the annular protrusion is greater than the outer diameter of the stator of the rotary transformer, the outer diameter of the annular protrusion is less than the inner diameter of the winding end portion.

9. The drive apparatus according to claim 8, characterized by The annular shield further comprises a wire hole, which penetrates the annular shield along the axial direction of the driving device, and is used for penetrating the connecting wire between the rotary transformer and the motor controller, the distance between the wire hole and the motor shaft axis along the radial direction of the driving device is greater than the outer diameter of the stator of the rotary transformer, and the wire hole is arranged between the annular protrusion and the through hole along the radial direction of the driving device.

10. The drive apparatus according to claim 9, characterized by The annular protrusion comprises a collision prevention section, the length of the collision prevention section along the axial direction of the driving device is greater than the length of other parts of the annular protrusion, and the wire hole is arranged between the collision prevention section and the through hole.

11. Drive arrangement according to any of claims 1-10, characterized in that The housing of the driving device comprises a motor cavity and a reducer cavity, the motor cavity is used for accommodating the stator of the driving motor and the rotor of the driving motor, the reducer cavity is used for accommodating the gear shaft of the reducer, the motor cavity and the reducer cavity are arranged along the axial direction of the driving device, the mounting hole is used for connecting the motor cavity and the reducer cavity, and the motor shaft of the driving motor is used for driving the wheels through the gear shaft of the reducer.

12. The drive apparatus according to claim 11, characterized by The housing of the driving device further comprises a bearing groove, which is used for fixing the outer ring of a bearing, the inner ring of the bearing is fixed to the motor shaft, the groove opening of the bearing groove faces away from the inner surface of the annular shield fixed to the housing along the axial direction of the driving device, the bearing groove is recessed towards the rotor of the driving motor along the axial direction of the driving device, and the mounting hole connects the motor cavity and the bearing groove.

13. The drive apparatus according to claim 11, characterized by The driving device comprises two driving motors, two reducers, two rotary transformers and two annular shields, the driving device comprises two housings and a partition plate, the two housings are arranged on the two sides of the partition plate along the axial direction of the driving device, the reducer cavities of the two housings are arranged between the motor cavities of the two housings; The distance between the two annular shields along the axial direction of the driving device is less than the distance between the stators of the two rotary transformers fixed by the two annular shields.

14. The drive apparatus according to claim 13, characterized by The stator of each driving motor comprises a stator core and a stator winding, the stator winding is fixed to the stator core, the stator winding comprises winding ends exposed at both ends of the stator core, the stator, the rotor of the rotary transformer and the annular shield are distributed on the inner side of the winding ends along the radial direction of the driving device; The distance between the two annular shields along the axial direction of the driving device is greater than the distance between the winding ends of the two driving motors towards the reducer cavities.

15. An electric vehicle, characterized by The electric vehicle comprises a frame and the driving device according to any one of claims 1-14, the frame is used for fixing the driving device, and the driving device is used for driving the wheels.

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