Disc-type motor, power generation assembly, and electric vehicle

Abstract

The present application provides a disc-type motor, a power generation assembly, and an electric vehicle. The disc-type motor comprises a rotor, an adapter shaft, and a stator. The adapter shaft comprises a first section, a second section, and a third section which are sequentially adjacently arranged in the axial direction of the disc-type motor. The first section is used for being directly fixed to a flange of an engine crankshaft, so that the adapter shaft and the rotor are supported on the crankshaft, the second section is used for passing through a shaft hole of the rotor and fixing the rotor in the circumferential direction of the disc-type motor, and the third section is used for passing through a shaft hole of the stator. The outer diameter of the first section is greater than the inner diameter of the shaft hole of one rotor and the outer diameter of the second section, so that the first section is stably connected to the crankshaft. The outer diameter of the second section is greater than or equal to the outer diameter of the third section, and the outer diameter of the third section is smaller than the inner diameter of the shaft hole of one stator, such that the adapter shaft of the generator is decoupled from the stator, thereby simplifying the structure of the disc-type motor, and improving the performance stability and reliability of the disc-type motor.

Description

Disc motor, power generation assembly and electric vehicle

[0001] The present application claims priority to the Chinese patent application No. 202410878714.6, filed on June 29, 2024, entitled "Disc motor, power generation assembly and electric vehicle", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of electric vehicles, in particular to a disc motor, a power generation assembly and an electric vehicle. BACKGROUND

[0003] The power generation assembly of the extended-range electric vehicle is usually composed of an engine, a flywheel disc, a speed increaser and a generator. In order to improve the transmission efficiency and reduce the size, the speed increaser is often cancelled, and the structure combination of "engine + flywheel disc + generator" is adopted. On this basis, the torque fluctuation of the engine crankshaft can be suppressed through software control technology, the flywheel disc can be removed, and the direct connection structure of "engine + generator" is formed, so as to further improve the product integration.

[0004] As a generator, the disc motor used in the above power generation assembly has the significant technical advantages of small axial size, compact structure, high power density and high efficiency. However, the following problems are caused thereby:

[0005] If the engine crankshaft is rigidly connected with the rotor disc of the disc motor, the engine crankshaft itself has a certain axial movement, and the movement is superimposed with heat. The amount of axial movement is about 0.5mm, which accounts for 45% to 65% of the air gap between the stator and the rotor of the disc motor. The axial movement directly leads to the reduction of the air gap between the stator and the rotor of the motor and the deterioration of the performance stability of the motor, and even the fault of the collision and rubbing between the stator and the rotor.

[0006] If the engine crankshaft is connected with the generator rotor through a spline, the axial movement and eccentric rotation of the crankshaft will generate additional axial force and radial force on the motor shaft, which is easy to cause the damage of the motor bearing, the failure of the shaft system, the tilting and rubbing of the rotor disc against the stator, and other faults. At the same time, the motor shaft and the rotor of this structure scheme often need to be connected and supported on the motor stator housing through two radial bearings, which occupies a large axial space, and is not conducive to the arrangement of the remaining devices and the reduction of the axial space size. SUMMARY

[0007] In view of the above problems, the present application provides a disc motor, a power generation assembly and an electric vehicle. The rotor and the stator are decoupled, and the rotor and the engine crankshaft are elastically connected through the adapter shaft, so as to reduce the axial movement of the rotor caused by the crankshaft through the elastic member or the rolling bearing, and realize the relative stability of the air gap between the stator and the rotor.

[0008] In a first aspect, the application provides a disc motor, the disc motor comprising a rotor, a connecting shaft and a stator, the connecting shaft comprising a first section, a second section and a third section, the first section, the second section and the third section being arranged in sequence along an axial direction of the disc motor. The first section is arranged to be directly fixed to a flange of a crankshaft of an engine, the second section is arranged to pass through a shaft hole of the rotor and to fix the rotor along a circumferential direction of the disc motor, and the third section is arranged to pass through a shaft hole of the stator. Along a radial direction of the disc motor, an outer diameter of the first section is greater than an inner diameter of the shaft hole of the rotor and an outer diameter of the second section, the outer diameter of the second section is greater than or equal to an outer diameter of the third section, and the outer diameter of the third section is less than an inner diameter of the shaft hole of the stator.

[0009] In the embodiment, the first section is arranged to be directly fixed to the flange of the crankshaft of the engine, and along the radial direction of the disc motor, the outer diameter of the first section is greater than the outer diameter of the second section, so that the first section of the connecting shaft has a larger area for fixing the flange of the crankshaft of the engine, thereby improving the fixing stability of the connecting shaft and the crankshaft of the engine, and the crankshaft of the engine can stably support the connecting shaft.

[0010] In the embodiment, the rotor is directly hung on the connecting shaft, and the connecting shaft is directly fixed to the crankshaft of the engine, so that the first section of the connecting shaft does not need to use a radial bearing, the connecting shaft does not need to reserve a position for installing the radial bearing, the axial size of the connecting shaft is small, thereby saving the space in the axial direction of the disc motor, and the disc motor is miniaturized.

[0011] In the embodiment, along the radial direction of the disc motor, the outer diameter of the first section is greater than the inner diameter of the shaft hole of the rotor, so that the rotor and the first section of the connecting shaft are partially laminated along the axial direction of the disc motor, the first section of the connecting shaft limits the rotor along the axial direction of the disc motor, and the rotor is prevented from moving too much along the axial direction of the disc motor, thereby affecting the air gap stability between the rotor and the stator and affecting the structural reliability of the disc motor.

[0012] In the embodiment, the second section is arranged to pass through the shaft hole of the rotor and to fix the rotor along the circumferential direction of the disc motor, and the outer diameter of the first section is greater than the outer diameter of the second section, so that the smaller outer diameter of the second section is conducive to the second section passing through the shaft hole of the rotor, and the rotor is fixed to the crankshaft through the connecting shaft.

[0013] In the embodiment, the outer diameter of the second section is greater than or equal to the outer diameter of the third section, because the outer diameter of the first section is large, the second section and the third section are arranged to pass through the rotor and the stator of the disc motor, so the outer diameter of the second section needs to be greater than or equal to the outer diameter of the third section, and the connecting shaft can pass through the rotor and the stator more smoothly.

[0014] In the embodiment of the present application, the outer diameter of the third section is smaller than the inner diameter of the shaft hole of the stator, so that the third section can be decoupled from the stator, so that there is no force relationship between the adapter shaft and the stator, so that the adapter shaft and the rotor are directly fixed on the crankshaft of the engine.

[0015] In the embodiment of the present application, the crankshaft of the engine is fixedly connected with the disc motor through the first section of the adapter shaft, and the first section with a larger outer diameter is used to realize stable connection between the adapter shaft and the crankshaft of the engine, and the radial bearing supporting the motor shaft is also cancelled, which is beneficial to the simplification of the structure of the disc motor, the shortening of the axial size, and the reduction of the cost. By designing the outer diameters of the second section and the third section of the adapter shaft to be relatively small, the adapter shaft can be arranged in the rotor and the stator, and by designing the outer diameter of the third section of the adapter shaft to be smaller than the inner diameter of the shaft hole of the stator, the decoupling of the stator and the rotor structure is realized.

[0016] In one embodiment, along the axial direction of the disc motor, the length of the first section is smaller than the lengths of the second section and the third section, and the length of the third section is smaller than the length of the second section.

[0017] In the embodiment of the present application, the length of the first section is smaller than the lengths of the second section and the third section, the first section is used to fix the crankshaft and has a larger outer diameter, and the smaller length of the first section along the axial direction of the disc motor makes the overall axial size of the adapter shaft smaller, also reduces the weight of the adapter shaft, and also makes the axial fixation of the crankshaft and the first section more stable when the crankshaft and the first section are fastened by screws.

[0018] In the embodiment of the present application, the length of the third section is smaller than the length of the second section, so that the overall axial length of the adapter shaft is smaller, which is beneficial to reducing the space occupation of the adapter shaft in the axial direction of the disc motor, and is beneficial to obtaining a disc motor with a smaller axial length and saving the layout space in the whole vehicle.

[0019] In one embodiment, the first section includes a plurality of through holes, each through hole being used to fix a flange plate of an engine crankshaft. The plurality of through holes are arranged at intervals along the circumferential direction of the disc motor, and each through hole penetrates the first section along the axial direction of the disc motor. Along the radial direction of the disc motor, the distance between each through hole and the axis of the adapter shaft is greater than half of the outer diameter of the second section.

[0020] In the embodiment of the present application, the plurality of through holes are arranged at intervals along the circumferential direction of the disc motor, so that the flange plates of the crankshafts and the adapter shaft can be fixedly connected around, and the connection stability of the flange plates of the crankshafts and the adapter shaft is improved. Each through hole penetrates the first section along the axial direction of the disc motor, so that the screws can pass through the first section of the adapter shaft, so that the fixed connection between the crankshafts and the adapter shaft is more stable, and the reliability of the power generation assembly is improved.

[0021] In the embodiment of the present application, along the radial direction of the disc motor, the distance between each through hole and the axis of the adapter shaft is greater than half the outer diameter of the second section. The through hole is formed by the part of the first section protruding from the second section, so that the screw fixing position of the crankshaft through the through hole is closer to the outer periphery of the first section along the radial direction of the disc motor and farther away from the axis of the adapter shaft. The connection stability of the crankshaft and the first section of the adapter shaft along the radial direction of the disc motor is higher, and the radial jitter is reduced. Along the radial direction of the disc motor, the distance between each through hole and the axis of the adapter shaft is greater than half the outer diameter of the second section, so that the multiple through holes are farther away from the axis of the adapter shaft along the radial direction of the disc motor, so that the circumference of the part of the first section where the multiple through holes are located is longer, and the number of through holes formed in the position is larger, which is beneficial to the fixed connection of the crankshaft and the adapter shaft.

[0022] In an embodiment, the first section includes one end face, one end face faces away from the second section along the axial direction of the disc motor, and one end face includes a crankshaft positioning groove for accommodating a part of the engine crankshaft. Wherein, the slot of the crankshaft positioning groove faces away from the second section along the axial direction of the disc motor. The slot width of the crankshaft positioning groove along the radial direction of the disc motor is smaller than the outer diameter of the second section.

[0023] In the embodiment of the present application, one end face includes a crankshaft positioning groove for accommodating a part of the engine crankshaft, and the crankshaft positioning groove of the adapter shaft is used for positioning with the crankshaft, so that the crankshaft and the adapter shaft can not be easily displaced when fixed, and the rigid connection of the crankshaft and the adapter shaft is more stable. It is also beneficial to the axial alignment and fixed connection of the screw hole on the flange plate of the crankshaft and the multiple through holes on the adapter shaft along the axial direction of the disc motor.

[0024] In the embodiment of the present application, the slot of the crankshaft positioning groove faces away from the second section along the axial direction of the disc motor, which is convenient for the fixed connection of the first section and the flange plate of the crankshaft. Only when the slot of the crankshaft positioning groove faces the crankshaft can the positioning of the adapter shaft and the crankshaft be realized.

[0025] In the embodiment of the present application, the width of the crankshaft positioning groove along the radial direction of the disc motor is less than the outer diameter of the second section, so that the crankshaft positioning groove is arranged after the first section, and the first section can be directly connected to the second section along the axial direction of the disc motor, which is beneficial to keep the first section of the adapter shaft stable after receiving power from the crankshaft. The width of the crankshaft positioning groove is less than the outer diameter of the second section, so that the thickness of the first section along the axial direction of the disc motor does not change compared to the part of the second section that protrudes outward along the radial direction of the disc motor. Since the part of the first section that protrudes outward along the radial direction is used to form a through hole, the crankshaft positioning groove is arranged away from the position where the through hole is formed, so that the first section can be fixed to the crankshaft while improving the stability of the fixation of the first section to the crankshaft. In addition, the width of the crankshaft positioning groove is less than the outer diameter of the second section, which is beneficial to the transmission of kinetic energy from the crankshaft to the second section of the adapter shaft, so as to drive the rotor fixed to the second section of the adapter shaft along the circumferential direction of the disc motor to rotate and reduce the loss of kinetic energy.

[0026] In an embodiment, the outer diameter of the second section is greater than or equal to the inner diameter of the shaft hole of a stator.

[0027] In the embodiment of the present application, the outer diameter of the second section is greater than or equal to the inner diameter of the shaft hole of a stator, so that the second section of the adapter shaft does not penetrate into the shaft hole of the stator, reducing the movement distance of the adapter shaft along the axial direction of the disc motor, which is beneficial to maintain the stability of the air gap between the rotor and the stator along the axial direction of the disc motor, and further ensure the stability of the magnetic field of the disc motor and the performance of the disc motor.

[0028] In an embodiment, the third section includes another end face, the other end face faces away from the first section along the axial direction of the disc motor, and the other end face includes a pre-tightening hole for accommodating a pre-tightening screw for fixing the third section to a stator. The opening of the pre-tightening hole faces away from the first section along the axial direction of the disc motor.

[0029] In the embodiment of the present application, the other end face includes a pre-tightening hole for accommodating a pre-tightening screw for fixing the third section to a stator. The relative fixation of the stator and the rotor is achieved, so that the gap between the stator and the rotor is stable, and the problem of the stator and the rotor being attracted and absorbed due to deflection during the delivery or transportation of the disc motor is avoided. After the adapter shaft of the disc motor is fixedly connected to the flange plate of the crankshaft of the engine, the pre-tightening screw is released or loosened by a certain distance, so that the adapter shaft and the stator are decoupled.

[0030] In an embodiment, a rotor comprises a recess, a slot of the recess is axially away from a stator along the axial direction of the disc motor, an axial hole of the rotor penetrates through a bottom of the slot along the axial direction of the disc motor, and the recess is used for accommodating at least part of the first section. In the embodiment, along the radial direction of the disc motor, the outer diameter of the first section is smaller than the slot width of the recess. Along the axial direction of the disc motor, the length of the first section is smaller than the slot depth of the recess.

[0031] In the embodiment, the slot of the recess is axially away from the stator along the axial direction of the disc motor, which is conducive to the recess accommodating at least part of the first section. The axial hole of the rotor penetrates through the bottom of the slot along the axial direction of the disc motor, so that the second section of the adapter shaft penetrates into the rotor through the bottom of the recess, and the recess is used for accommodating at least part of the first section. Since the rotor supported by the second section is relatively heavy, the surface of the rotor facing the first section is formed with a recess, so that the part of the crankshaft fixed with the first section can be closer to the rotor along the axial direction of the disc motor, the transmission along the axial direction of the disc motor is more stable, and the support of the crankshaft to the rotor along the radial direction of the disc motor is more stable.

[0032] In the embodiment, the surface of the rotor facing the first section is formed with a recess, and at least part of the first section is accommodated in the recess, so that at least part of the first section overlaps the rotor along the radial direction of the disc motor, which is also conducive to reducing the overall length along the axial direction of the disc motor and reducing the overall size of the disc motor.

[0033] In the embodiment, along the radial direction of the disc motor, the outer diameter of the first section is smaller than the slot width of the recess, and the recess can accommodate at least part of the first section, so that the part of the crankshaft fixed with the first section is closer to the rotor along the axial direction of the disc motor, the transmission along the axial direction of the disc motor is more stable, and the support of the crankshaft to the rotor along the radial direction of the disc motor is more stable.

[0034] In the embodiment, along the axial direction of the disc motor, the length of the first section is smaller than the slot depth of the recess, so that the first section can be completely accommodated in the recess along the axial direction of the disc motor, so that the first section does not occupy too much space along the axial direction of the disc motor, and the first section can have a movable space in the recess along the axial direction of the disc motor, which is conducive to realizing the axial flexible connection of the crankshaft and the rotor.

[0035] In an embodiment, a rotor comprises another recess, a slot of the another recess is axially towards a stator along the axial direction of the disc motor, and the another recess is used for accommodating a magnetic steel of the rotor. In the embodiment, along the radial direction of the disc motor, half of the outer diameter of the first section is smaller than the distance between the inner circumferential wall of the another recess and the axis of the adapter shaft.

[0036] In the embodiment of the present application, the slot of the other recess is axially directed towards the stator of the disc motor, so that the other recess accommodates the magnetic steel of the rotor towards the stator, so that the air gap is formed between the rotor and the stator. The other recess is used to accommodate the magnetic steel of the rotor, and is radially directed towards the disc motor. The half of the outer diameter of the first section is smaller than the distance between the inner wall of the other recess and the axis of the adapter shaft, so that the first section can be arranged closer to the inner side of the disc motor in the radial direction of the disc motor, so that the first section directly fixed to the crankshaft of the engine is spaced apart from the magnetic steel of the rotor in the radial direction of the disc motor, and when the first section receives the force of the crankshaft in the axial direction of the disc motor, the first section directly drives the inner part of the rotor in the axial direction of the disc motor without directly driving the magnetic steel part of the rotor, so that the air gap between the magnetic steel of the rotor and the stator is stable. In addition, the half of the outer diameter of the first section is smaller than the distance between the inner wall of the other recess and the axis of the adapter shaft, so that the first section can be arranged closer to the inner side of the disc motor in the radial direction of the disc motor, so that the adapter shaft is small in the radial dimension of the disc motor, and the weight of the adapter shaft is reduced, which is beneficial to the lightweight of the disc motor.

[0037] In an embodiment, the third section is spaced apart from the inner wall of the shaft hole of the stator in the radial direction of the disc motor to accommodate a bushing. In this embodiment, the distance between the third section and the inner wall of the shaft hole of the stator in the radial direction of the disc motor is greater than the thickness of the bushing.

[0038] In the embodiment of the present application, the third section is spaced apart from the inner wall of the shaft hole of the stator in the radial direction of the disc motor to accommodate a bushing. Since the adapter shaft and the rotor are carried by the crankshaft, the adapter shaft and the rotor are decoupled from the stator, and when the crankshaft shakes in the axial direction or the radial direction of the disc motor, the bushing makes the adapter shaft contact the adapter shaft when it is deflected, which can limit the amplitude of the axial and radial shaking. Compared with the direct contact between the adapter shaft and the stator housing, the contact between the adapter shaft and the bushing can reduce the friction between the two relative sliding, and reduce the vibration impact of the adapter shaft on the stator housing when the adapter shaft shakes. In addition, in the embodiment of the present application, the adapter shaft and the stator housing are spaced apart by the bushing, compared with the connection of the motor shaft to the stator housing by the radial bearing, the bushing is smaller in size and volume in the radial direction of the disc motor, which is beneficial to the miniaturization of the disc motor.

[0039] In the embodiment of the present application, the distance between the third section and the inner wall of the shaft hole of the stator in the radial direction of the disc motor is greater than the thickness of the bushing, so that the adapter shaft and the bushing can have a relatively free space in the axial direction of the disc motor, and the adapter shaft and the stator housing can also be decoupled. When the adapter shaft receives kinetic energy from the crankshaft, the vibration impact of the adapter shaft on the stator housing is reduced, which is beneficial to improve the stability of the disc motor.

[0040] In an embodiment, the first section comprises a ring-shaped accommodating groove, and an end of the ring-shaped accommodating groove is used for accommodating one end of an elastic member along the axial direction of the disc motor, and the other end of the elastic member is used for abutting against the rotor. An opening of the ring-shaped accommodating groove is directed towards the rotor along the axial direction of the disc motor. Along the radial direction of the disc motor, the distance between the outer peripheral wall of the ring-shaped accommodating groove and the axis of the adapter shaft is greater than half of the inner diameter of the shaft hole of the rotor, and the distance between the inner peripheral wall of the ring-shaped accommodating groove and the axis of the adapter shaft is greater than half of the outer diameter of the second section.

[0041] In the embodiment, the first section comprises a ring-shaped accommodating groove, and an end of the ring-shaped accommodating groove is used for accommodating one end of an elastic member along the axial direction of the disc motor, and the other end of the elastic member is used for abutting against the rotor, so that the elastic member can absorb the axial displacement between the adapter shaft and the rotor along the axial direction of the disc motor, and reduce the axial displacement and radial shaking of the adapter shaft driven by the crankshaft.

[0042] In the embodiment, the opening of the ring-shaped accommodating groove is directed towards the rotor along the axial direction of the disc motor, which is beneficial to placing the elastic member into the ring-shaped accommodating groove, and the one end of the elastic member can abut against the adapter shaft, and the other end of the elastic member can abut against the rotor, so that the elastic member can absorb the relative displacement between the adapter shaft and the rotor, reduce the influence of the axial displacement of the adapter shaft on the air gap between the rotor and the stator, and further help to maintain the stability of the magnetic field of the disc motor and the performance of the disc motor.

[0043] In the embodiment, the rotor is fixed to the second section along the circumferential direction of the disc motor, and along the radial direction of the disc motor, the distance between the outer peripheral wall of the ring-shaped accommodating groove and the axis of the adapter shaft is greater than half of the inner diameter of the shaft hole of the rotor, and the distance between the inner peripheral wall of the ring-shaped accommodating groove and the axis of the adapter shaft is greater than half of the outer diameter of the second section, so that after the elastic member is placed in the ring-shaped accommodating groove, the other end of the elastic member can abut against the rotor along the axial direction of the disc motor, thereby absorbing the relative displacement between the adapter shaft and the rotor, reducing the influence of the axial displacement of the adapter shaft on the air gap between the rotor and the stator, and further helping to maintain the stability of the magnetic field of the disc motor and the performance of the disc motor.

[0044] In an embodiment, the second section comprises at least one radial groove, and each radial groove is used for accommodating a sliding key, and each sliding key is used for being fixed to the inner peripheral surface of the rotor. Along the radial direction of the disc motor, each radial groove is recessed away from the rotor. Along the axial direction of the disc motor, the length of each radial groove is greater than the length of the sliding key inside the radial groove.

[0045] In the embodiment of the present application, the second section comprises at least one radial groove, each radial groove is used for accommodating a sliding key, the sliding key is used for being fixed to the inner circumferential surface of the rotor, and the cooperation between the radial groove and the sliding key enables the adapter shaft to drive the rotor to rotate along the circumferential direction of the disc motor and enables the adapter shaft to slide relative to the rotor along the axial direction of the disc motor. The adapter shaft can also be kept relatively stable along the radial direction of the disc motor when it slides along the axial direction of the disc motor, thereby avoiding the radial movement of the adapter shaft from affecting the air gap.

[0046] In the embodiment of the present application, along the radial direction of the disc motor, each radial groove is recessed away from the rotor, so that the sliding key can contact the inner circumferential surface of the rotor after being placed in the radial groove, thereby enabling the cooperation between the radial groove and the sliding key to drive the rotor to rotate along the circumferential direction of the disc motor and enabling the adapter shaft to slide relative to the rotor along the axial direction of the disc motor.

[0047] In the embodiment of the present application, along the axial direction of the disc motor, the length of each radial groove is greater than the length of the sliding key inside the radial groove, so that the sliding key can slide in the radial groove along the axial direction of the disc motor, allowing the adapter shaft to move relative to the rotor along the axial direction of the disc motor, avoiding the adapter shaft from directly driving the rotor to move towards the stator, and thereby reducing the air gap change between the rotor and the stator.

[0048] In one embodiment, the stator shell of one stator comprises a sleeve protrusion, one sleeve protrusion faces one rotor protrusion along the axial direction of the disc motor, the stator core of one stator is wrapped around the outer periphery of one sleeve protrusion, and the shaft hole of one stator penetrates one sleeve protrusion along the axial direction of the disc motor. Wherein, the end face of one sleeve protrusion facing one rotor comprises a bearing groove, and the bearing groove is used for accommodating a needle bearing. Along the radial direction of the disc motor, the outer diameter of the second section is smaller than the inner diameter of the needle bearing.

[0049] In the embodiment of the present application, the sleeve protrusion faces the rotor protrusion along the axial direction of the disc motor, so that the axial dimension of the disc motor is small and the abutment between the stator shell and the rotor is tighter, and it is also conducive to arranging the needle bearing between the rotor and the stator shell.

[0050] In the embodiment of the present application, the end face of the sleeve protrusion facing the rotor comprises a bearing groove, the bearing groove is used for accommodating a needle bearing, the needle bearing is used for contacting the rotor along the axial direction of the disc motor and for being rotationally connected with the rotor, the needle bearing can constrain the axial position between the rotor and the stator, and can also realize the relative rotation of the rotor relative to the stator along the circumferential direction of the disc motor.

[0051] In the embodiment of the present application, along the radial direction of the disc motor, the outer diameter of the second section is smaller than the inner diameter of the needle bearing, so that the needle bearing can be arranged in abutment between the end face of the rotor and the stator shell, and the needle bearing will not affect the relative sliding of the adapter shaft relative to the rotor along the axial direction of the disc motor.

[0052] In an embodiment, the adapter shaft further comprises a fourth segment, the fourth segment is arranged along the disc motor axis and away from one end of the third segment for fixing the fourth segment, the stator further comprises a through hole and a resolver accommodating slot, the shaft hole, the through hole and the resolver accommodating slot of the stator are sequentially arranged along the disc motor axis, the slot opening of the resolver accommodating slot is away from the rotor along the disc motor axis, the fourth segment is used for penetrating the through hole and fixing the rotor of the resolver sensor accommodated in the resolver accommodating slot. In the embodiment, along the disc motor radial direction, the outer diameter of the fourth segment is smaller than the outer diameter of the third segment, and the outer diameter of the third segment is greater than the inner diameter of the through hole. Along the disc motor axis, the distance between the second segment and the resolver accommodating slot is less than the length of the shaft sleeve protrusion.

[0053] In the embodiment, the slot opening of the resolver accommodating slot is away from the rotor along the disc motor axis, which facilitates the arrangement of the resolver sensor through the slot opening of the resolver accommodating slot. The fourth segment is used for fixing the rotor of the resolver sensor accommodated in the resolver accommodating slot, and the resolver sensor can accurately collect the rotation speed and displacement signals of the crankshaft. In addition, the resolver sensor can be accommodated in the space between the adapter shaft and the stator shell, which can avoid the resolver sensor protruding from the stator shell, reduce the axial size of the disc motor, make the structure of the disc motor more compact and lightweight, and improve the power density of the power generation assembly.

[0054] In the embodiment, along the disc motor radial direction, the outer diameter of the fourth segment is smaller than the outer diameter of the third segment, and the outer diameter of the third segment is greater than the inner diameter of the through hole, which facilitates the smooth penetration of the fourth segment into the through hole. The outer diameter of the third segment is greater than the inner diameter of the through hole, which also facilitates limiting the movement distance of the adapter shaft along the disc motor axis, so that the movement of the adapter shaft along the disc motor axis will not exceed the shaft hole of the stator, and the stability of the structure is improved.

[0055] In the embodiment, along the disc motor axis, the distance between the second segment and the resolver accommodating slot is less than the length of the shaft sleeve protrusion. The resolver accommodating slot is formed by the thickness of the shaft sleeve protrusion along the disc motor axis, which can reduce the axial size of the disc motor and facilitate the reduction of the overall volume of the disc motor.

[0056] In a second aspect, the application provides a power generation assembly, which comprises the disc motor of the first aspect, and the first segment of the adapter shaft is arranged along the disc motor axis and fixed to the flange plate of the engine crankshaft.

[0057] The disc motor in the embodiment of the present application directly fixes the first segment of the adapter shaft to the crankshaft of the engine, so that the adapter shaft and the rotor are supported by the crankshaft, and the third end of the adapter shaft has an outer diameter smaller than the inner diameter of the shaft hole of the stator, so that the adapter shaft of the generator is decoupled from the stator, the influence of the axial movement of the engine crankshaft on the performance stability and reliability of the disc motor is reduced, and the reliability of the generator assembly is improved.

[0058] In a third aspect, the present application provides an electric vehicle, which comprises a vehicle frame, a power battery and the generator assembly of the second aspect, the vehicle frame is used for fixing the generator assembly, and the disc motor is used for charging the power battery.

[0059] The generator assembly in the embodiment of the present application comprises a disc motor, the disc motor directly fixes the first segment of the adapter shaft to the crankshaft of the engine, so that the adapter shaft and the rotor are supported by the crankshaft, and the third end of the adapter shaft has an outer diameter smaller than the inner diameter of the shaft hole of the stator, so that the adapter shaft of the generator is decoupled from the stator, the influence of the axial movement of the engine crankshaft on the performance stability and reliability of the disc motor is reduced, the reliability of the generator assembly is improved, and the performance of the whole vehicle is improved. BRIEF DESCRIPTION OF DRAWINGS

[0060] 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.

[0061] FIG. 1 is a structural schematic diagram of an electric vehicle provided by the embodiment of the present application;

[0062] FIG. 2 is a structural schematic diagram of a generator assembly provided by the embodiment of the present application;

[0063] FIG. 3 is a structural schematic diagram of a disc motor provided by the embodiment of the present application;

[0064] FIG. 4 is an exploded view of the disc motor provided by the embodiment of the present application;

[0065] FIG. 5 is a structural schematic diagram of an adapter shaft provided by the embodiment of the present application;

[0066] FIG. 6 is another structural schematic diagram of the adapter shaft provided by the embodiment of the present application;

[0067] FIG. 7 is a sectional view of the disc motor provided by the embodiment of the present application;

[0068] FIG. 8a is a partial enlarged view of M1 part of the disc motor in FIG. 7;

[0069] FIG. 8b is a partial enlarged view of M1 part of the disc motor in FIG. 7;

[0070] FIG. 8c is a partial enlarged view of M1 part of the disc motor in FIG. 7;

[0071] Fig. 9 is another structural schematic diagram of the adapter shaft provided in the embodiments of the present application;

[0072] Fig. 10 is a partial enlarged view of the M2 part of the disc motor in Fig. 8c;

[0073] Fig. 11 is a partial enlarged view of the M3 part of the disc motor in Fig. 7;

[0074] Fig. 12 is a structural schematic diagram of the rotor provided in the embodiments of the present application. DETAILED DESCRIPTION

[0075] 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.

[0076] For the convenience of understanding, the English abbreviations and related technical terms involved in the embodiments of the present application will be explained and described below.

[0077] In order to reduce the influence of the axial movement of the engine crankshaft on the performance stability and reliability of the disc motor, the present application provides a disc motor, which comprises a rotor, an adapter shaft and a stator. The adapter shaft comprises a first segment, a second segment and a third segment, which are arranged in sequence along the axial direction of the disc motor. The first segment is used for being directly fixed to the flange of an engine crankshaft, the second segment is used for penetrating the shaft hole of a rotor and fixing the rotor along the circumferential direction of the disc motor, and the third segment is used for penetrating the shaft hole of a stator. In the radial direction of the disc motor, the outer diameter of the first segment is greater than the inner diameter of the shaft hole of the rotor and the outer diameter of the second segment, the outer diameter of the second segment is greater than or equal to the outer diameter of the third segment, and the outer diameter of the third segment is less than the inner diameter of the shaft hole of the stator. The disc motor provided in the present application directly fixes the first segment of the adapter shaft to the crankshaft of the engine, so that the adapter shaft and the rotor are supported by the crankshaft. The outer diameter of the third end of the adapter shaft is less than the inner diameter of the shaft hole of the stator, so that the adapter shaft of the generator is decoupled from the stator. The radial bearing supporting the shaft of the motor is cancelled, which is conducive to the simplification of the structure of the disc motor, the reduction of the cost and the reduction of the axial space size, and is conducive to the reduction of the influence of the axial movement of the engine crankshaft on the performance stability and reliability of the disc motor.

[0078] The disc motor provided in the embodiments of the present application is applied to a power generation assembly, and the power generation assembly is applied to an electric vehicle, thereby improving the overall performance of the electric vehicle.

[0079] Fig. 1 is a structural schematic diagram of an electric vehicle 1 provided in the embodiments of the present application. Fig. 2 is a structural schematic diagram of a power generation assembly 10 provided in the embodiments of the present application.

[0080] In an embodiment, the electric vehicle 1 comprises a frame 20, a power generation assembly 10 and a power battery 30. As shown in FIG. 1, the power generation assembly 10 and the power battery 30 are fixed to the frame 20. The power battery 30 is configured to receive power from the power generation assembly 10.

[0081] In the embodiment, the electric vehicle 1 refers to a wheeled device driven or pulled by a power device.

[0082] In an embodiment, the power generation assembly 10 comprises a disc motor 11 and a transmission device (not shown). As shown in FIG. 2, a motor shaft of the disc motor 11 is configured to be directly connected to an engine 12, a rotor of the disc motor 11 is electrically connected to the power battery 30, the engine 12 is configured to drive the rotor of the disc motor 11 to rotate, and the disc motor 11 is configured to generate electric energy to charge the power battery 30.

[0083] In an embodiment, a stator 300 of the disc motor 11 is configured to be fixed to a housing of the engine 12 or the frame 20.

[0084] In an embodiment, the power generation assembly 10 further comprises a motor controller 13. As shown in FIG. 2, the motor controller 13 is configured to be electrically connected to the power battery 30, and the motor controller 13 is configured to convert alternating current transmitted by the disc motor 11 into direct current and transmit the direct current to the power battery 30.

[0085] In an embodiment, the transmission device is an engine crankshaft 12a, the engine crankshaft 12a is directly connected to the motor shaft of the disc motor 11, the engine 12 directly transmits kinetic energy to the disc motor 11, converts the kinetic energy into electric energy, and charges the power battery 30.

[0086] The engine crankshaft is directly and rigidly connected to the motor shaft of the disc motor, axial movement of the engine crankshaft is directly transmitted to the rotor of the generator, and large axial movement easily affects air gap stability and structural reliability of the generator.

[0087] In the embodiment, the motor shaft of the disc motor is replaced by a segmented adapter shaft, the adapter shaft and the stator are decoupled, the adapter shaft and the rotor are hung on the engine crankshaft, the transmission of the crankshaft and the adapter shaft is more accurate, energy loss in transmission is reduced, and vibration is reduced.

[0088] The disc motor 11 provided in the embodiment will be described in detail below.

[0089] Fig. 3 is a structural schematic diagram of the disc motor 11 according to an embodiment of the present application, Fig. 4 is an exploded view of the disc motor 11 according to an embodiment of the present application, Fig. 5 is a structural schematic diagram of the adapter shaft 100 according to an embodiment of the present application, Fig. 6 is another structural schematic diagram of the adapter shaft according to an embodiment of the present application, Fig. 7 is a sectional view of the disc motor 11 according to an embodiment of the present application, Fig. 8a is a partial enlarged view of the M1 part of the disc motor 11 in Fig. 7, Fig. 8b is a partial enlarged view of the M1 part of the disc motor 11 in Fig. 7, and Fig. 8c is a partial enlarged view of the M1 part of the disc motor 11 in Fig. 7.

[0090] In one embodiment, the disc motor 11 decoupled from the stator 300 includes a rotor 200, an adapter shaft 100, and a stator 300, as shown in Fig. 5. The adapter shaft 100 includes a first segment 110, a second segment 120, and a third segment 130, which are sequentially arranged along the disc motor axial direction O. As shown in Figs. 4 to 7, the first segment 110 is used to be directly fixed to the flange plate 12b of an engine crankshaft 12a, the second segment 120 is used to pass through the shaft hole 210 of the rotor 200 and fix the rotor 200 along the disc motor circumferential direction C, and the third segment 130 is used to pass into the shaft hole 310 of the stator 300. As shown in Figs. 5 and 8a, along the disc motor radial direction R, the outer diameter of the first segment 110 is greater than the inner diameter of the shaft hole 210 of the rotor 200 and the outer diameter of the second segment 120, the outer diameter of the second segment 120 is greater than or equal to the outer diameter of the third segment 130, and the outer diameter of the third segment 130 is less than the inner diameter of the shaft hole 310 of the stator 300.

[0091] In the embodiment of the present application, as shown in Figs. 5 and 8a, the outer diameter of the first segment 110 is denoted as L1, the inner diameter of the shaft hole 210 of the rotor 200 is denoted as L2, the outer diameter of the second segment 120 is denoted as L3, the outer diameter of the third segment 130 is denoted as L4, and the inner diameter of the shaft hole 310 of the stator 300 is denoted as L5. The first segment 110 is used to be directly fixed to the flange plate 12b of the engine crankshaft 12a, and L1>L3, so that the first segment 110 of the adapter shaft 100 has a larger area for being fixed to the flange plate 12b of the engine crankshaft 12a, thereby improving the fixing stability of the adapter shaft 100 and the engine crankshaft 12a, and enabling the engine crankshaft 12a to stably support the adapter shaft 100.

[0092] In the embodiment of the present application, the larger outer diameter of the first segment 110 of the adapter shaft 100 enables the first segment 110 to have a larger area to form a fixing hole, the fixing hole is used to be fixed to the flange plate 12b of the engine crankshaft 12a by a screw 12c, thereby improving the fixing stability of the adapter shaft 100 and the engine crankshaft 12a.

[0093] In the embodiment of the present application, the rotor 200 is directly hung on the adapter shaft 100, and the adapter shaft 100 is directly fixed to the engine crankshaft 12a, so that the first section 110 of the adapter shaft 100 does not need to use a radial bearing, so that the adapter shaft 100 does not need to reserve a position for installing a radial bearing, so that the axial size of the adapter shaft 100 is small, thereby saving the space on the disc motor axial O, and facilitating the miniaturization of the disc motor 11.

[0094] In the embodiment of the present application, as shown in FIG. 5, L1>L2, so that the rotor 200 and the first section 110 of the adapter shaft 100 have partial lamination along the disc motor axial O, so that the first section 110 of the adapter shaft 100 limits the rotor 200 along the disc motor axial O, avoids the large movement of the rotor 200 along the disc motor axial O, and affects the air gap stability between the rotor 200 and the stator 300 and the structural reliability of the disc motor 11.

[0095] In the embodiment of the present application, the second section 120 is used to pass through the shaft hole 210 of the rotor 200 and fix the rotor 200 along the disc motor circumferential C, as shown in FIG. 5 and FIG. 8a, L1>L3, and the smaller L3 is conducive to the second section 120 passing through the shaft hole 210 of the rotor 200, and the rotor 200 is directly fixed on the crankshaft 12a through the adapter shaft 100.

[0096] In the embodiment of the present application, as shown in FIG. 5, L3≥L4, because the outer diameter of the first section 110 is large, only the second section 120 and the third section 130 can pass through the rotor 200 and the stator 300 of the disc motor 11, so the outer diameter of the second section 120 needs to be greater than or equal to the outer diameter of the third section 130, and the process of the adapter shaft 100 passing through the rotor 200 and the stator 300 is more smooth.

[0097] In the embodiment of the present application, as shown in FIG. 5 and FIG. 8a, L4

[0098] In the embodiment of the present application, the crankshaft 12a of the engine 12 and the disc motor 11 are fixedly connected through the first section 110 of the adapter shaft 100, the first section 110 with a larger outer diameter is used to realize the stable connection between the adapter shaft 100 and the crankshaft 12a of the engine 12, and the radial bearing supporting the motor shaft is cancelled, which is conducive to the structural simplification of the disc motor 11 and reduces the cost. The outer diameters of the second section 120 and the third section 130 of the adapter shaft 100 are designed to be small, so that the adapter shaft 100 can be arranged in the rotor 200 and the stator 300, and the outer diameter of the third section 130 of the adapter shaft 100 is smaller than the inner diameter of the shaft hole 310 of the stator 300, thereby realizing the decoupling of the structures of the stator 300 and the rotor 200.

[0099] In an embodiment, the disc motor 11 is directly fixedly connected with the crankshaft 12a of the engine 12 through the first section 110 of the adapter shaft 100, and the disc motor 11 can also cancel the conductive bearing. Since the adapter shaft 100 is directly fixedly connected with the crankshaft 12a, the shaft current generated by the disc motor 11 can be conducted to the engine housing of the engine 12 through the crankshaft 12a, so that the structural components of the disc motor 11 are reduced, the structure is simplified, the cost is reduced, and the volume is smaller.

[0100] In an embodiment, the adapter shaft 100 is integrally formed with the crankshaft 12a, and the axial connection between the crankshaft 12a and the adapter shaft 100 of the disc motor 11 is more stable, and the structural strength is improved.

[0101] In an embodiment, along the disc motor axial direction O, as shown in FIG. 5, the length of the first section 110 is less than the lengths of the second section 120 and the third section 130, and the length of the third section 130 is less than the length of the second section 120.

[0102] In the embodiment of the present application, as shown in FIGS. 5 and 7, along the disc motor axial direction O, the length of the first section 110 is denoted as L6, the length of the second section 120 is denoted as L7, and the length of the third section 130 is denoted as L8. L6 < L7, L6 < L8, the first section 110 is used to fix the crankshaft 12a and has a larger outer diameter, the length of the first section 110 along the disc motor axial direction O is smaller, so that the overall axial size of the adapter shaft 100 is small, the weight of the adapter shaft 100 is also reduced, and the axial fixation is more stable when the crankshaft 12a and the first section 110 are fastened by the screw 12c.

[0103] In the embodiment of the present application, L8 < L7, so that the overall axial length of the adapter shaft 100 is smaller, which is beneficial to reduce the space occupation of the adapter shaft 100 in the disc motor axial direction O, and is beneficial to obtain a disc motor 11 with a smaller axial length and save the layout space in the whole vehicle.

[0104] FIG. 9 is another structural schematic view of the adapter shaft 100 provided in the embodiment of the present application.

[0105] In an embodiment, the first section 110 includes a plurality of through holes 111, as shown in FIGS. 4 and 9, each through hole 111 is used to fix the flange plate 12b of the engine crankshaft 12a. Among them, the plurality of through holes 111 are arranged at intervals along the disc motor circumferential direction C, and each through hole 111 penetrates the first section 110 along the disc motor axial direction O. Along the disc motor radial direction R, the distance between each through hole 111 and the axis N of the adapter shaft 100 is greater than half of the outer diameter of the second section 120.

[0106] In the embodiment of the present application, the first section 110 includes a plurality of through holes 111, each of which is used to fix the flange plate 12b of the engine crankshaft 12a, and the screw 12c passes through the through hole 111 to directly fix and connect the crankshaft 12a and the first section 110 of the adapter shaft 100.

[0107] In the embodiment of the present application, the plurality of through holes 111 are arranged along the circumference C of the disc motor, so that the flange plate 12b of the crankshaft 12a can be fixed and connected to the periphery of the adapter shaft 100, thereby improving the connection stability of the flange plate 12b of the crankshaft 12a and the adapter shaft 100. Each through hole 111 penetrates the first section 110 along the axial direction O of the disc motor, so that the screw 12c can pass through the first section 110 of the adapter shaft 100, thereby making the fixed connection of the crankshaft 12a and the adapter shaft 100 more stable and improving the reliability of the power generation assembly 10.

[0108] In the embodiment of the present application, as shown in FIGS. 5 and 9, along the radial direction R of the disc motor, the distance between each through hole 111 and the axis N of the adapter shaft 100 is L9, the outer diameter of the second section 120 is L3, and L9>0.5L3. The part of the first section 110 protruding from the second section 120 forms the through hole 111, so that the fixed position of the crankshaft 12a through the through hole 111 and the screw 12c of the first section 110 is closer to the outer periphery of the first section 110 of the adapter shaft 100 along the radial direction R of the disc motor and farther away from the axis N of the adapter shaft 100, so that the connection stability of the crankshaft 12a and the first section 110 of the adapter shaft 100 along the radial direction R of the disc motor is higher, and the radial jitter is reduced. L9>0.5L3 makes the plurality of through holes 111 farther away from the axis N of the adapter shaft 100 along the radial direction R of the disc motor, so that the circumference of the part of the first section 110 where the plurality of through holes 111 are located is longer, thereby having a larger position to form a larger number of through holes 111, which is beneficial to making the fixed connection of the crankshaft 12a and the adapter shaft 100 more stable.

[0109] In one embodiment, the first section 110 includes an end face 150, as shown in FIGS. 4, 5 and 8c, the end face 150 faces away from the second section 120 along the axial direction O of the disc motor, and the end face 150 includes a crankshaft positioning groove 112 for accommodating a part of the engine crankshaft 12a. The slot opening 112a of the crankshaft positioning groove 112 faces away from the second section 120 along the axial direction O of the disc motor. The groove width of the crankshaft positioning groove 112 along the radial direction R of the disc motor is smaller than the outer diameter of the second section 120.

[0110] In the embodiment of the present application, the end surface 150 comprises a crankshaft positioning groove 112 for accommodating a portion of the engine crankshaft 12a, the crankshaft positioning groove 112 of the adapter shaft 100 is used to position the crankshaft 12a, so that the crankshaft 12a can not be easily displaced when fixed with the adapter shaft 100, so that the rigid connection of the crankshaft 12a and the adapter shaft 100 is more stable, and it is also beneficial to the fixed connection of the screw holes on the flange plate 12b of the crankshaft 12a and the plurality of through holes 111 on the adapter shaft 100 along the axial direction O of the disc motor.

[0111] In the embodiment of the present application, the slot opening 112a of the crankshaft positioning groove 112 is away from the second section 120 along the axial direction O of the disc motor, which facilitates the fixed connection of the first section 110 and the flange plate 12b of the crankshaft 12a, and the positioning of the adapter shaft 100 and the crankshaft 12a can only be achieved when the slot opening 112a of the crankshaft positioning groove 112 faces the crankshaft 12a.

[0112] In the embodiment of the present application, as shown in FIG. 8c, the slot width of the crankshaft positioning groove 112 along the radial direction R of the disc motor is L10, and the outer diameter of the second section 120 is L3, L10 < L3, so that after the crankshaft positioning groove 112 is formed in the first section 110, the thinner part of the first section 110 can be directly connected with the second section 120 along the axial direction O of the disc motor, which is beneficial to keeping the first section 110 of the adapter shaft 100 in a relatively stable state after receiving power from the crankshaft 12a. L10 < L3, so that the thickness of the first section 110 along the axial direction O of the disc motor does not change compared with the outwardly convex part of the second section 120 along the radial direction R of the disc motor. Since the outwardly convex part of the first section 110 is used to form the through hole 111, the crankshaft positioning groove 112 is avoided from the position where the through hole 111 is formed, so that the fixed stability of the first section 110 and the crankshaft 12a can be improved under the condition of positioning the crankshaft 12a and the first section 110. In addition, L10 < L3 is also beneficial to the transmission of kinetic energy from the crankshaft 12a to the second section 120 of the adapter shaft 100, so as to drive the rotor 200 fixed along the circumferential direction C of the disc motor to rotate, and reduce the loss of kinetic energy.

[0113] In one embodiment, as shown in FIG. 8a, the outer diameter of the second section 120 is greater than or equal to the inner diameter of the shaft hole 310 of the stator 300.

[0114] In the embodiment of the present application, the outer diameter of the second section 120 is L3, and the inner diameter of the shaft hole 310 of the stator 300 is L5, L3 ≥ L5, so that the second section 120 of the adapter shaft 100 will not penetrate into the shaft hole 310 of the stator 300, reducing the movement distance of the adapter shaft 100 along the axial direction O of the disc motor, which is beneficial to maintaining the stability of the air gap between the rotor 200 and the stator 300 along the axial direction O of the disc motor, and further ensuring the stability of the magnetic field of the disc motor 11 and the performance of the disc motor 11.

[0115] In an embodiment, the third section 130 comprises another end face 160, as shown in FIGS. 5-8c, the end face 160 faces away from the first section 110 along the disc motor axial direction O, and the end face 160 comprises a pre-tightening hole 131 for accommodating a pre-tightening screw (not shown) for fixing the third section 130 and the stator 300. The opening 131a of the pre-tightening hole 131 faces away from the first section 110 along the disc motor axial direction O.

[0116] In the embodiment of the present application, the end face 160 comprises a pre-tightening hole 131 for accommodating a pre-tightening screw for fixing the third section 130 and the stator 300, and relatively fixing the stator 300 and the rotor 200, so as to stabilize the gap between the stator 300 and the rotor 200, avoid the scattered parts of the disc motor 11 during the delivery or transportation process, or avoid the problem of the stator 300 and the rotor 200 being attracted and absorbed due to deflection during the delivery or transportation process of the disc motor 11. After the flange plate 12b of the crankshaft 12a of the engine 12 is fixedly connected with the adapter shaft 100 of the disc motor 11, the pre-tightening screw is released or loosened by a certain distance, so as to decouple the adapter shaft 100 and the stator 300.

[0117] In the embodiment of the present application, the opening 131a of the pre-tightening hole 131 faces away from the first section 110 along the disc motor axial direction O, so that the opening 131a of the pre-tightening hole 131 faces the stator 300, which is beneficial to the pre-tightening screw in the pre-tightening hole 131 for fixing and connecting the third section 130 and the stator 300.

[0118] In an embodiment, the rotor 200 comprises a recess 220, as shown in FIGS. 4 and 8b, the slot opening 221 of the recess 220 faces away from the stator 300 along the disc motor axial direction O, and the shaft hole 210 of the rotor 200 penetrates the slot bottom 222 of the recess 220 along the disc motor axial direction O, and the recess 220 is used for accommodating at least part of the first section 110. Along the disc motor radial direction R, the outer diameter of the first section 110 is smaller than the slot width of the recess 220. Along the disc motor axial direction O, the length of the first section 110 is smaller than the slot depth of the recess 220.

[0119] In the embodiment of the present application, the slot mouth 221 of the recess 220 is away from the stator 300 along the disc motor axial direction O, which is conducive to the recess 220 accommodating at least part of the first section 110. The shaft hole 210 of the rotor 200 penetrates the slot bottom 222 of the recess 220 along the disc motor axial direction O, so that the second section 120 of the adapter shaft 100 penetrates the rotor 200 through the slot bottom 222 of the recess 220, and the recess 220 is used to accommodate at least part of the first section 110. Since the rotor 200 supported by the second section 120 is relatively heavy, the recess 220 is formed on the surface of the rotor 200 facing the first section 110, so that the part of the crankshaft 12a fixed by the first section 110 can be closer to the rotor 200 along the disc motor axial direction O, the transmission along the disc motor axial direction O is more stable, and the disc motor radial direction R support of the rotor 200 by the crankshaft 12a is more stable.

[0120] In the embodiment of the present application, the recess 220 is formed on the surface of the rotor 200 facing the first section 110, and at least part of the first section 110 is accommodated in the recess 220, so that at least part of the first section 110 overlaps the rotor 200 along the disc motor radial direction R, which is also conducive to reducing the overall length of the disc motor axial direction O and reducing the overall size of the disc motor 11.

[0121] In the embodiment of the present application, as shown in FIG. 8b, along the disc motor radial direction R, the outer diameter of the first section 110 is L1, and the slot width of the recess 220 is L11, L1 < L11, and the recess 220 can accommodate at least part of the first section 110, so that the part of the crankshaft 12a fixedly connected with the first section 110 is closer to the rotor 200 along the disc motor axial direction O, the transmission along the disc motor axial direction O is more stable, and the support of the rotor 200 by the crankshaft 12a along the disc motor radial direction R is more stable.

[0122] In the embodiment of the present application, as shown in FIG. 5 and FIG. 8a, along the disc motor axial direction O, the length of the first section 110 is L6, and the slot depth of the recess 220 is L12, L6 < L12, so that the first section 110 can be completely accommodated in the recess 220 along the disc motor axial direction O, so that the first section 110 does not occupy too much space of the disc motor 11 along the disc motor axial direction O, and also so that the first section 110 can have a movable space in the recess 220 along the disc motor axial direction O, which is conducive to realizing the axial flexible connection of the crankshaft 12a and the rotor 200.

[0123] In one embodiment, the rotor 200 includes another recess 230, as shown in FIG. 7, the slot mouth 231 of the recess 230 faces the stator 300 along the disc motor axial direction O, and the recess 230 is used to accommodate the magnetic steel 240 of the rotor 200. Wherein, along the disc motor radial direction R, half of the outer diameter of the first section 110 is smaller than the distance between the inner circumferential wall 232 of the recess 230 and the axis N of the adapter shaft 100.

[0124] In the embodiment of the present application, the slot opening 231 of the recess 230 is directed towards the stator 300 along the disc motor axial direction O, so that the recess 230 accommodates the magnetic steel 240 of the rotor 200 towards the stator 300, so that the air gap is formed between the rotor 200 and the stator 300. As shown in FIG. 7, the outer diameter of the first section 110 is L1, the distance between the inner circumferential wall 232 of the recess 230 and the axis N of the adapter shaft 100 is L13, the recess 230 is used to accommodate the magnetic steel 240 of the rotor 200, 0.5L1

[0125] FIG. 10 is a partial enlarged view of the M2 portion of the disc motor 11 in FIG. 8c.

[0126] In an embodiment, as shown in FIGS. 4, 7, 8c and 10, the third section 130 is spaced apart from the inner wall 311 of the shaft hole 310 of the stator 300 along the disc motor radial direction R for accommodating a bushing 320. Wherein the third section 130 is spaced apart from the inner wall 311 of the shaft hole 310 of the stator 300 along the disc motor radial direction R by a distance greater than the thickness of the bushing 320.

[0127] In the embodiment of the application, the third section 130 of the adapter shaft 100 along the radial direction R of the disc motor is spaced apart from the inner wall 311 of the shaft hole 310 of the stator 300 to accommodate a bushing 320. Since the adapter shaft 100 and the rotor 200 are supported by the crankshaft 12a, the adapter shaft 100 and the rotor 200 are decoupled from the stator 300. When the crankshaft 12a shakes along the axial direction O or the radial direction R of the disc motor, the bushing 320 allows the adapter shaft 100 to contact the adapter shaft 100 when it is deflected, which can limit the amplitude of the axial direction O and the radial direction R shaking. Compared with the adapter shaft 100 directly contacting the stator housing 301, the adapter shaft 100 contacting the bushing 320 can reduce the friction between the two relative sliding, and reduce the vibration impact of the adapter shaft 100 on the stator housing 301 when the adapter shaft 100 shakes. In addition, in the embodiment of the application, the adapter shaft 100 and the stator housing 301 are spaced apart by the bushing 320. Compared with the motor shaft being connected to the stator housing 301 by a radial bearing, the bushing 320 is smaller in size along the radial direction R of the disc motor and smaller in volume compared with the radial bearing, which is conducive to the miniaturization of the disc motor 11.

[0128] In the embodiment of the application, as shown in FIG. 10, the spacing between the third section 130 of the adapter shaft 100 along the radial direction R of the disc motor and the inner wall 311 of the shaft hole 310 of the stator 300 is denoted as L14, and the thickness of the bushing 320 is denoted as L15. L14 < L15, so that the adapter shaft 100 and the bushing 320 can have a relatively free space for movement along the axial direction O of the disc motor. In addition, the adapter shaft 100 and the stator housing 301 are decoupled. When the adapter shaft 100 receives kinetic energy from the crankshaft 12a, the vibration impact of the adapter shaft 100 on the stator housing 301 is reduced, which is conducive to improving the stability of the disc motor 11.

[0129] In an embodiment, the bushing 320 has self-lubricating properties. The material of the bushing 320 includes copper-based powder metallurgy, or iron-based powder metallurgy, or polytetrafluoroethylene.

[0130] In an embodiment, the stator housing 301 includes the shaft hole 310 of the stator 300. The bushing 320 is fixed to the inner wall of the shaft hole 310 of the stator housing 301. The third section 130 of the adapter shaft 100 and the bushing 320 have a gap therebetween, so that the adapter shaft 100 and the stator housing 301 are decoupled. The third section 130 of the adapter shaft 100 and the bushing 320 can slide relative to each other along the axial direction O of the disc motor and along the radial direction R of the disc motor.

[0131] FIG. 11 is a partial enlarged view of the M3 portion of the disc motor 11 in FIG. 7.

[0132] In an embodiment, the first section 110 comprises a ring-shaped accommodating groove 113, as shown in FIG. 4, FIG. 6, FIG. 7, FIG. 8c, FIG. 9 and FIG. 11, the ring-shaped accommodating groove 113 is used to accommodate one end 114a of an elastic member 114 along the axial direction O of the disc motor, and the other end 114b of the elastic member 114 is used to abut against the rotor 200. The groove opening 113a of the ring-shaped accommodating groove 113 is directed towards the rotor 200 along the axial direction O of the disc motor. As shown in FIG. 7 and FIG. 11, along the radial direction R of the disc motor, the distance between the outer peripheral wall 113b of the ring-shaped accommodating groove 113 and the axis N of the adapter shaft 100 is greater than half of the inner diameter of the shaft hole 210 of the rotor 200, and the distance between the inner peripheral wall 113c of the ring-shaped accommodating groove 113 and the axis N of the adapter shaft 100 is greater than half of the outer diameter of the second section 120.

[0133] In the embodiment of the present application, the first section 110 comprises a ring-shaped accommodating groove 113, the ring-shaped accommodating groove 113 is used to accommodate one end 114a of an elastic member 114 along the axial direction O of the disc motor, and the other end 114b of the elastic member 114 is used to abut against the rotor 200, so that the elastic member 114 can absorb the axial displacement between the adapter shaft 100 and the rotor 200 along the axial direction O of the disc motor, and reduce the axial displacement and radial jitter of the adapter shaft 100 driven by the crankshaft 12a.

[0134] In the embodiment of the present application, the groove opening 113a of the ring-shaped accommodating groove 113 is directed towards the rotor 200 along the axial direction O of the disc motor, which is beneficial to place the elastic member 114 into the ring-shaped accommodating groove 113, so that one end 114a can abut against the adapter shaft 100, and the other end 114b can abut against the rotor 200, so that the elastic member 114 can absorb the relative movement between the adapter shaft 100 and the rotor 200, reduce the influence of the axial displacement of the adapter shaft 100 on the air gap between the rotor 200 and the stator 300, and further facilitate to maintain the stability of the magnetic field of the disc motor 11 and the performance of the disc motor 11.

[0135] In the embodiment of the present application, as shown in FIG. 11, along the radial direction R of the disc motor, the distance between the outer circumferential wall 113b of the annular accommodating groove 113 and the axis N of the adapter shaft 100 is denoted as L16, and the distance between the inner circumferential wall 113c of the annular accommodating groove 113 and the axis N of the adapter shaft 100 is denoted as L17. As shown in FIG. 8a, the inner diameter of the shaft hole 210 of the rotor 200 is L2, and as shown in FIG. 5, the outer diameter of the second section 120 is L3. The rotor 200 is fixed to the second section 120 along the circumferential direction C of the disc motor. L16>0.5L2, and L17>0.5L3. After the elastic member 114 is placed in the annular accommodating groove 113, along the axial direction O of the disc motor, the other end 114b of the elastic member 114 can abut against the rotor 200, so that the relative movement between the adapter shaft 100 and the rotor 200 can be absorbed, the axial movement of the adapter shaft 100 is reduced, the influence of the axial movement of the adapter shaft 100 on the air gap between the rotor 200 and the stator 300 is reduced, and the stability of the magnetic field of the disc motor 11 and the performance of the disc motor 11 are maintained.

[0136] In an embodiment, as shown in FIG. 7 and FIG. 11, the first section 110 includes the annular accommodating groove 113, the rotor 200 includes the recess 230 for accommodating the magnetic steel 240, the annular accommodating groove 113 along the axial direction O of the disc motor is used for accommodating one end 114a of the elastic member 114, and the other end 114b of the elastic member 114 is used for abutting against the rotor 200. Along the radial direction R of the disc motor, the outer diameter of the first section 110 is smaller than the distance between the inner circumferential wall 232 of the recess 230 and the axis N of the adapter shaft 100.

[0137] In the embodiment of the present application, the outer diameter of the first section 110 is L1, and the distance between the inner circumferential wall 232 of the recess 230 and the axis N of the adapter shaft 100 is L13. The recess 230 is used for accommodating the magnetic steel 240 of the rotor 200, and L1

[0138] In an embodiment, as shown in FIG. 7, during the process that the adapter shaft 100 is driven by the crankshaft 12a to move towards the rotor 200 and the stator 300 along the axial direction O of the disc motor, the elastic member 114 is used to be compressed by the first section 110 and the rotor 200 and generate an acting force towards the first section 110. The axial movement of the adapter shaft 100 towards the rotor 200 can be absorbed by the elastic member 114, the stability of the interval of the air gap surface between the rotor 200 and the stator 300 is maintained, and the stability of the magnetic field of the disc motor 11 and the performance of the disc motor 11 are maintained.

[0139] In an embodiment, as shown in FIG. 4 and FIG. 11, the annular accommodating groove 113 is also used to accommodate an annular gasket 115, one side of the annular gasket 115 abuts against the bottom of the annular accommodating groove 113, and the other side of the annular gasket 115 abuts against the elastic member 114. The axial displacement of the elastic member 114 along the axial direction O of the disc motor is adjusted according to the thickness of the annular gasket 115, so as to meet the requirements of different installation conditions of the disc motor 11.

[0140] In an embodiment, the rotor 200 comprises a groove 220, which is used to accommodate at least part of the first section 110 and the elastic member 114, wherein the other end 114b of the elastic member 114 abuts against the groove bottom 222 of the groove 220. Accommodating the first section 110 and the elastic member 114 in the groove 220 makes the elastic member 114 stably abut against the first section 110 and the groove bottom 222 of the groove 220, so as to avoid the displacement of the elastic member 114 along the radial direction R of the disc motor when the elastic member 114 is subjected to force.

[0141] In an embodiment, the groove depth of the groove 220 along the axial direction O of the disc motor is less than the free length of the first section 110 and the elastic member 114, so that when the first section 110 and the elastic member 114 are accommodated in the groove 220, the elastic member 114 is in a compressed state, so that the elastic member 114 has greater force to resist the tendency of the first section 110 of the adapter shaft 100 to move towards the rotor 200, thereby reducing the distance of the axial movement of the adapter shaft 100.

[0142] In an embodiment, the distance between the outer peripheral wall 113b of the annular accommodating groove 113 and the axis N of the adapter shaft 100 is less than the distance between the through hole 111 and the axis N of the adapter shaft 100, so that the annular accommodating groove 113 is closer to the axis N of the adapter shaft 100 than the through hole 111, avoiding the interference between the screw in the through hole 111 and the elastic member 114, so that the radial dimension of the elastic member 114 accommodated in the annular accommodating groove 113 is small, saving cost and reducing weight, so that the position of the first section 110 away from the axis N of the adapter shaft 100 has more space to form the through hole 111, improving the fixing stability of the adapter shaft 100 and the crankshaft 12a.

[0143] In an embodiment, the second section 120 comprises at least one radial groove 121, as shown in FIG. 5, FIG. 6 and FIG. 8a, each radial groove 121 is used to accommodate a sliding key 122, and the sliding key 122 is used to be fixed to the inner peripheral surface of the rotor 200. Wherein, along the radial direction R of the disc motor, each radial groove 121 is recessed away from the rotor 200. Along the axial direction O of the disc motor, the length of each radial groove 121 is greater than the length of the sliding key 122 therein.

[0144] In the embodiment of the present application, the second section 120 comprises at least one radial groove 121, each radial groove 121 is used to accommodate a sliding key 122, the sliding key 122 is used to be fixed to the inner circumferential surface of the rotor 200, the cooperation between the radial groove 121 and the sliding key 122 enables the adapter shaft 100 to drive the rotor 200 to rotate along the circumferential direction C of the disc motor, and also enables the adapter shaft 100 to slide relative to the rotor 200 along the axial direction O of the disc motor. In addition, the adapter shaft 100 can also keep relatively stable along the radial direction R of the disc motor when it slides along the axial direction O of the disc motor, thereby avoiding the radial movement of the adapter shaft 100 affecting the air gap change.

[0145] In the embodiment of the present application, along the radial direction R of the disc motor, each radial groove 121 is recessed away from the rotor 200, so that the sliding key 122 can contact the inner circumferential surface of the rotor 200 after being placed in the radial groove 121, thereby enabling the cooperation between the radial groove 121 and the sliding key 122 to drive the rotor 200 to rotate along the circumferential direction C of the disc motor, and also enabling the adapter shaft 100 to slide relative to the rotor 200 along the axial direction O of the disc motor.

[0146] In the embodiment of the present application, along the axial direction O of the disc motor, the length of each radial groove 121 is greater than the length of the sliding key 122 inside it, so that the sliding key 122 can slide in the radial groove 121 along the axial direction O of the disc motor, allowing the adapter shaft 100 to move relative to the rotor 200 along the axial direction O of the disc motor, thereby avoiding the adapter shaft 100 directly driving the rotor 200 to move towards the stator 300, and further reducing the air gap change between the rotor 200 and the stator 300.

[0147] In one embodiment, the second section 120 comprises two radial grooves 121, which are symmetrically distributed on the outer circumferential surface of the second section 120, thereby improving the stability of the relative fixation of the second section 120 and the rotor 200 along the circumferential direction C of the disc motor. In one embodiment, the second section 120 comprises a plurality of radial grooves 121, and the rotor 200 is fixed relative to the second section 120 along the circumferential direction C of the disc motor by cooperating with the plurality of radial grooves 121 of the second section 120 through the sliding keys 122, and the second section 120 and the rotor 200 can slide relative to each other along the axial direction O of the disc motor.

[0148] FIG. 12 is a structural schematic diagram of the rotor 200 provided by the embodiment of the present application.

[0149] In an embodiment, as shown in FIG. 5, FIG. 8a, FIG. 8b, FIG. 8c and FIG. 12, the rotor 200 comprises at least one radial recess 250, the radial recess 250 on the rotor 200 corresponds to the radial recess 121 on the second section 120 one by one along the disc motor radial direction R, each radial recess 250 on the rotor 200 comprises an axial notch 251, the axial notch 251 faces the first section 110 along the disc motor axial direction O, each radial recess 121 on the second section 120 comprises an axial notch 121a, the axial notch 121a faces away from the first section 110 along the disc motor axial direction O.

[0150] In the embodiment of the present application, the radial recess 250 of the rotor 200 and the radial recess 121 of the first section 110 jointly accommodate the sliding key 122, the sliding key 122 slides in the two radial recesses 250, 121 along the disc motor axial direction O, the two radial recesses 250, 121 have axial notches 251 and 121a, but the opening directions of the two axial notches are different, which can effectively control the sliding distance of the sliding key 122 in the two radial recesses 250, 121.

[0151] In an embodiment, the stator housing 301 of the stator 300 comprises a shaft sleeve protrusion 330, as shown in FIG. 4 and FIG. 7, the shaft sleeve protrusion 330 protrudes towards the rotor 200 along the disc motor axial direction O, the stator core 340 of the stator 300 is wrapped around the outer periphery of the shaft sleeve protrusion 330, and the shaft hole 310 of the stator 300 penetrates through the shaft sleeve protrusion 330 along the disc motor axial direction O. Among them, the end face 331 of the shaft sleeve protrusion 330 towards the rotor 200 comprises a bearing groove 332 for accommodating a needle bearing 350. Along the disc motor radial direction R, the outer diameter of the second section 120 is smaller than the inner diameter of the needle bearing 350.

[0152] In the embodiment of the present application, the shaft sleeve protrusion 330 protrudes towards the rotor 200 along the disc motor axial direction O, so that the axial size of the disc motor 11 is small and the stator housing 301 and the rotor 200 can be more tightly abutted, and it is also beneficial to arrange the needle bearing 350 between the rotor 200 and the stator housing 301.

[0153] In the embodiment of the present application, the end face 331 of the shaft sleeve protrusion 330 towards the rotor 200 comprises a bearing groove 332 for accommodating a needle bearing 350, the needle bearing 350 is used to contact the rotor 200 along the disc motor axial direction O and is used to be rotationally connected with the rotor 200, the needle bearing 350 can constrain the axial position between the rotor 200 and the stator 300, and also can realize the relative rotation of the rotor 200 relative to the stator 300 along the disc motor circumferential direction C.

[0154] In the embodiment of the present application, as shown in FIG. 7, along the radial direction R of the disc motor, the outer diameter of the second section 120 is L3, and the inner diameter of the needle bearing 350 is L18, and L3 < L18, so that the needle bearing 350 can be arranged in abutment with the end surface of the rotor 200 opposite the stator housing 301, and the needle bearing 350 does not affect the relative sliding of the adapter shaft 100 along the axial direction O of the disc motor relative to the rotor 200.

[0155] In an embodiment, the end surface of the rotor 200 away from the stator 300 is elastically connected to the first section 110 by the elastic member 114, and the end surface of the rotor 200 towards the stator 300 is axially fixed between the shaft sleeve protrusion 330 of the stator housing 301 by the needle bearing 350, so that when the crankshaft 12a drives the first section 110 of the adapter shaft 100 to move towards the stator 300 along the axial direction O of the disc motor, the first section 110 compresses the elastic member 114 of the rotor 200, and the elastic member 114 generates a force towards the first section 110, thereby reducing the axial displacement of the adapter shaft 100 moving towards the stator 300, thereby reducing the axial displacement, so that the air gap between the rotor 200 and the stator 300 remains unchanged, thereby maintaining the stability of the magnetic field of the disc motor 11 and the performance of the disc motor 11. When the adapter shaft 100 moves towards the stator 300 along the axial direction O of the disc motor, the adapter shaft 100 can move circumferentially relative to the stator 300 due to the spacing between the adapter shaft 100 and the stator housing 301 and the spacing through the bushing 320, so that the adapter shaft 100 does not push the stator 300 to move axially when the adapter shaft 100 moves axially, thereby reducing the vibration and noise of the disc motor 11, and also reducing the impact of the axial displacement of the adapter shaft 100 on the structural reliability of the disc motor 11.

[0156] In an embodiment, the adapter shaft 100 further comprises a fourth section 140, as shown in FIGS. 4, 7 and 8c, and along the axial direction O of the disc motor, one end of the third section 130 away from the second section 120 is used to fix the fourth section 140, and the stator 300 further comprises a communication hole 360 and a resolver accommodating groove 370, and along the axial direction O of the disc motor, the shaft hole 310, the communication hole 360 and the resolver accommodating groove 370 of the stator 300 are arranged in sequence, and the slot opening 371 of the resolver accommodating groove 370 faces away from the rotor 200 along the axial direction O of the disc motor, and the fourth section 140 is used to pass through the communication hole 360 and fix a rotor (not shown) of a resolver sensor accommodated in the resolver accommodating groove 370. Among them, along the radial direction R of the disc motor, the outer diameter of the fourth section 140 is smaller than the outer diameter of the third section 130, and the outer diameter of the third section 130 is greater than the inner diameter of the communication hole 360. Along the axial direction O of the disc motor, the distance between the second section 120 and the resolver accommodating groove 370 is less than the length of the shaft sleeve protrusion 330.

[0157] In the embodiment of the present application, the slot opening 371 of the resolver accommodating groove 370 is opposite to the rotor 200 along the axial direction O of the disc motor, so that the resolver sensor can be arranged through the slot opening 371 of the resolver accommodating groove 370. The fourth section 140 is used to fix the rotor of the resolver sensor accommodated in the resolver accommodating groove 370. The resolver sensor can accurately collect the rotation speed and displacement signal of the crankshaft 12a. In addition, the resolver sensor can be accommodated in the space between the adapter shaft 100 and the stator housing 301, so that the resolver sensor does not protrude from the stator housing 301, the axial size of the disc motor 11 is reduced, the structure of the disc motor 11 is more compact and lightweight, and the power density of the power generation assembly 10 is improved.

[0158] In the embodiment of the present application, as shown in FIGS. 8a and 8b, along the radial direction R of the disc motor, the outer diameter of the fourth section 140 is L19, the outer diameter of the third section 130 is L4, and the inner diameter of the communication hole 360 is L20. L19 < L4, which is conducive to the smooth penetration of the fourth section 140 into the communication hole 360. L4 > L20, which is also conducive to limiting the movement distance of the adapter shaft 100 along the axial direction O of the disc motor, so that the movement of the adapter shaft 100 along the axial direction O of the disc motor does not exceed the shaft hole 310 of the stator 300, and the stability of the structure is improved.

[0159] In the embodiment of the present application, as shown in FIG. 8a, along the axial direction O of the disc motor, the distance between the second section 120 and the resolver accommodating groove 370 is L21, and the length of the shaft sleeve protrusion 330 is L22. L21 < L22, the resolver accommodating groove 370 is formed by the thickness of the shaft sleeve protrusion 330 along the axial direction O of the disc motor, which can reduce the axial size of the disc motor 11 and reduce the overall volume of the disc motor 11.

[0160] In one embodiment, along the radial direction R of the disc motor, the slot width of the resolver accommodating groove 370 is smaller than the outer diameter of the shaft sleeve protrusion 330.

[0161] In the embodiment of the present application, as shown in FIG. 8c, along the radial direction R of the disc motor, the slot width of the resolver accommodating groove 370 is L23, and the outer diameter of the shaft sleeve protrusion 330 is L24. L23 < L24, that is, the bottom of the resolver accommodating groove 370 along the axial direction O of the disc motor can have a relatively thick bottom, which is conducive to the stability of the stator housing 301, and further ensures the stability of the structure of the disc motor 11.

[0162] In one embodiment, as shown in FIG. 7, the shaft hole of the fourth section 140 is used to accommodate a conductive bearing (not shown). The conductive bearing is placed in the shaft hole of the fourth section 140, which can make full use of the space of the fourth section 140, and the conductive bearing does not occupy too much space outside the disc motor 11, so that the integration of the power generation assembly 10 is improved.

[0163] In an embodiment, as shown in FIG. 7, the fourth section 140 is integrally formed with the third section 130, the second section 120 and the first section 110, which is advantageous to make the structure of the power generation assembly 10 more stable.

[0164] In an embodiment, as shown in FIG. 7, the third section 130, the second section 120 and the first section 110 are an integral structure, and the fourth section 140 is a separate structure from the third section 130, the second section 120 and the first section 110, which makes the fourth section 140 more flexible to assemble with the integral structure of the third section 130, the second section 120 and the first section 110, and is advantageous to pre-tighten the stator 300 and the rotor 200 through the pre-tightening hole 131.

[0165] In an embodiment, the fourth section 140 comprises a rotating shaft fixing section 140a, an intermediate section 140b and a resolver fixing section 140c connected in sequence along the axial direction O of the disc motor, the pre-tightening hole 131 of the third section 130 is used to fix the rotating shaft fixing section 140a of the fourth section 140, the resolver fixing section 140c is used to fix the rotor of the resolver sensor, and the intermediate section 140b is used to pass through the communication hole 360, the outer diameter of the rotating shaft fixing section 140a and the outer diameter of the resolver fixing section 140c are smaller than the outer diameter of the intermediate section 140b, and the outer diameter of the intermediate section 140b is smaller than the communication hole 360.

[0166] In an embodiment, the pre-tightening hole 131 has a thread, and the outer circumferential surface of the rotating shaft fixing section 140a has a thread, and the rotating shaft fixing section 140a is fixedly connected with the fourth section 140 through the thread.

[0167] The disc motor, the power generation assembly 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, and the above embodiment description is only used to help understand the method and the core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, the specific embodiments and application range can be changed, and the above description should not be understood as a limitation of the present application.

Claims

1. A disc motor, characterized in that, The disc motor includes a rotor, a transfer shaft, and a stator. The transfer shaft includes a first segment, a second segment, and a third segment, which are arranged adjacent to each other along the axial direction of the disc motor. The first section is used to directly fix a flange to an engine crankshaft; the second section is used to pass through the shaft hole of the rotor and fix the rotor circumferentially along the disc motor; and the third section is used to pass through the shaft hole of the stator. Along the radial direction of the disc motor, the outer diameter of the first segment is greater than the inner diameter of the shaft hole of the rotor and the outer diameter of the second segment, the outer diameter of the second segment is greater than or equal to the outer diameter of the third segment, and the outer diameter of the third segment is less than the inner diameter of the shaft hole of the stator.

2. The disc motor according to claim 1, characterized in that, Along the axial direction of the disc motor, the length of the first segment is less than the lengths of the second and third segments, and the length of the third segment is less than the length of the second segment.

3. The disc motor according to claim 1, characterized in that, The first segment includes a plurality of through holes, each of which is used to secure a flange for fixing one of the engine crankshafts, wherein: The plurality of through holes are arranged at intervals along the circumference of the disc motor, and each of the through holes penetrates the first segment along the axial direction of the disc motor; Along the radial direction of the disc motor, the distance between each of the through holes and the axis of the adapter shaft is greater than half the outer diameter of the second segment.

4. The disc motor according to claim 1, characterized in that, The first segment includes an end face that is axially opposite to the second segment along the disc motor axis. The end face includes a crankshaft positioning groove for accommodating a portion of the engine crankshaft, wherein: The opening of the crankshaft positioning groove is axially away from the second section along the disc motor axis; The width of the crankshaft positioning groove along the radial direction of the disc motor is smaller than the outer diameter of the second segment.

5. The disc motor according to claim 1, characterized in that, The outer diameter of the second segment is greater than or equal to the inner diameter of the shaft hole of the stator.

6. The disc motor according to claim 1, characterized in that, The third segment includes another end face, which is axially opposite to the first segment along the disc motor axis. This other end face includes a preload hole for receiving a preload screw, which is used to secure the third segment to the stator. The opening of the pre-tightening hole is axially away from the first segment along the disc motor axis.

7. The disc motor according to any one of claims 1-6, characterized in that, The rotor includes a groove, the opening of which is axially opposite to the stator along the disc motor axis, and the shaft hole of the rotor penetrates the bottom of the groove along the disc motor axis. The groove is used to accommodate at least a portion of the first segment, wherein: Along the radial direction of the disc motor, the outer diameter of the first segment is smaller than the groove width of the groove. Along the axial direction of the disc motor, the length of the first segment is less than the groove depth of the groove.

8. The disc motor according to any one of claims 1-7, characterized in that, The rotor includes another groove, the opening of which is axially aligned with the stator along the disc motor axis, the other groove being used to receive the magnets of the rotor, wherein: Along the radial direction of the disc motor, half of the outer diameter of the first segment is less than the distance between the inner peripheral wall of the other groove and the axis of the adapter shaft.

9. The disc motor according to any one of claims 1-8, characterized in that, The distance between the third segment radially from the inner wall of the shaft hole of the stator is used to accommodate a bushing, wherein: The distance between the third segment along the radial direction of the disc motor and the inner wall of the shaft hole of the stator is greater than the thickness of the bushing.

10. The disc motor according to any one of claims 1-9, characterized in that, The first segment includes an annular receiving groove along the axis of the disc motor for accommodating one end of an elastic element, and the other end of the elastic element for abutting against the rotor. The opening of the annular receiving groove is axially oriented toward the rotor along the disc motor axis; Along the radial direction of the disc motor, the distance between the outer peripheral wall of the annular receiving groove and the axis of the adapter shaft is greater than half the inner diameter of the shaft hole of the rotor, and the distance between the inner peripheral wall of the annular receiving groove and the axis of the adapter shaft is greater than half the outer diameter of the second segment.

11. The disc motor according to any one of claims 1-10, characterized in that, The second segment includes at least one radial groove, each radial groove for receiving a sliding key for fixing to the inner circumferential surface of the rotor, wherein: Along the radial direction of the disc motor, each of the radial grooves is recessed away from the rotor. Along the axial direction of the disc motor, the length of each radial groove is greater than the length of a sliding key within it.

12. The disc motor according to any one of claims 1-11, characterized in that, The stator housing of one stator includes a bushing protrusion facing the rotor protrusion along the axial direction of the disc motor. The stator core of the one stator surrounds the outer periphery of the bushing protrusion. The shaft hole of the one stator penetrates the bushing protrusion along the axial direction of the disc motor, wherein: The end face of the bushing protrusion facing the rotor includes a bearing groove for accommodating a needle roller bearing. Along the radial direction of the disc motor, the outer diameter of the second segment is smaller than the inner diameter of the needle roller bearing.

13. The disc motor according to claim 12, characterized in that, The adapter shaft further includes a fourth section, with one end of the third section facing away from the second section along the axis of the disc motor used to fix the fourth section. The stator also includes a connecting hole and a resolver receiving slot. The shaft hole, the connecting hole, and the resolver receiving slot of the stator are arranged sequentially adjacent to each other along the axis of the disc motor. The opening of the resolver receiving slot faces away from the rotor along the axis of the disc motor. The fourth section passes through the connecting hole and is used to fix a rotor containing a resolver sensor housed in the resolver receiving slot. Wherein: Along the radial direction of the disc motor, the outer diameter of the fourth segment is smaller than the outer diameter of the third segment, and the outer diameter of the third segment is larger than the inner diameter of the connecting hole; Along the axial direction of the disc motor, the distance between the second segment and the resolver receiving groove is less than the length of the bushing protrusion.

14. A power generation assembly, characterized in that, The power generation assembly includes a disc motor as described in any one of claims 1-13, wherein a transfer shaft of the disc motor is fixed to an engine crankshaft and is used to receive drive from the engine, and a first section of the transfer shaft is used to fix to a flange of the engine crankshaft along the axial direction of the disc motor.

15. An electric vehicle, characterized in that, The electric vehicle includes a frame, a power battery, and a power generation assembly as described in claim 14, wherein the frame is used to fix the power generation assembly, and the disc motor is used to charge the power battery.

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