Generator, extended-range power assembly and extended-range electric vehicle

Abstract

The invention provides a generator, an extended-range power assembly and an extended-range electric vehicle. A shell of the generator is used for containing and fixing a stator, the stator surrounds a rotor, and the rotor is used for being fixedly connected with a motor shaft. The rotor comprises a center hole, an annular check ring and a plurality of oil inlet holes. The center hole comprises a first center hole and a second center hole which are communicated in the axial direction of the generator, the first center hole is used for being fixedly connected with a motor shaft, the motor shaft penetrates through the first center hole and extends into the second center hole, the inner diameter of the second center hole is larger than that of the first center hole, and the second center hole is used for collecting cooling oil. The inner diameter of the annular check ring is smaller than the inner diameter of the second center hole, the annular check ring is used for preventing cooling oil collected by the second center hole from being thrown out, the multiple oil inlet holes are distributed in the side, facing the first center hole, of the annular check ring, each oil inlet hole is used for guiding the cooling oil collected by the second center hole into the rotor, the oil inlet amount of the oil inlet holes is increased, and the cooling efficiency is improved. And the heat dissipation performance of the rotor is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a generator, a range-extending power assembly and a range-extending electric vehicle. BACKGROUND

[0002] With the development of new energy technology, range-extending electric vehicles have been more widely used. The high power density and high torque density of the generator of the range-extending power assembly in the range-extending electric vehicle can improve the cruising range of the range-extending electric vehicle. Among them, improving the heat dissipation performance of the generator has become an important way to improve the high torque density and high power density of the generator.

[0003] However, the existing generator has poor heat dissipation effect, which affects the overall performance of the range-extending power assembly and the cruising range of the range-extending electric vehicle. SUMMARY

[0004] The present application provides a generator, a range-extending power assembly and a range-extending electric vehicle, the rotor of the generator has good heat dissipation performance, which helps to improve the overall performance of the range-extending power assembly and the cruising range of the range-extending electric vehicle.

[0005] In a first aspect, the embodiments of the present application provide a generator, the generator comprising a shell, a stator, a rotor and a motor shaft, the shell being used for accommodating and fixing the stator, the stator being arranged around the rotor, and the rotor being used for fixedly connecting the motor shaft. The rotor comprises a central hole, an annular check ring and a plurality of oil inlet holes. The central hole comprises a first central hole and a second central hole, the first central hole and the second central hole being connected in communication along an axial direction of the generator, the first central hole being used for fixedly connecting the motor shaft, the motor shaft extending into the second central hole through the first central hole, the inner diameter of the second central hole being larger than the inner diameter of the first central hole, and the second central hole being used for collecting cooling oil. The inner diameter of the annular check ring is smaller than the inner diameter of the second central hole, the annular check ring being used for preventing the cooling oil collected in the second central hole from being thrown out, and the plurality of oil inlet holes are distributed on a side of the annular check ring facing the first central hole, each of the plurality of oil inlet holes being used for guiding the cooling oil collected in the second central hole into the interior of the rotor.

[0006] The generator provided by the embodiments of the present application prevents the cooling oil in the second central hole from being thrown out of the rotor under the action of centrifugal force, increases the amount of cooling oil flowing into the plurality of oil inlet holes of the rotor from the second central hole, and improves the heat dissipation performance of the rotor of the generator.

[0007] In an implementation manner, the generator comprises a shell oil supply hole, the shell oil supply hole is distributed on an inner wall of the shell facing the second central hole, and the inner radius of the annular check ring along the radial direction of the generator is greater than the distance between the shell oil supply hole and the axis of the generator. Correspondingly, the annular check ring avoids the cooling oil ejected from the shell oil supply hole along the axial direction of the generator, and increases the amount of oil ejected from the shell oil supply hole into the second central hole.

[0008] In an implementation, the generator includes motor shaft oil supply holes distributed on the outer circumferential surface of the motor shaft, and the motor shaft oil supply holes are located on the side of the bearing of the motor shaft facing the first central hole in the axial direction of the generator. Correspondingly, under the action of centrifugal force, the bearing of the motor shaft prevents the cooling oil sprayed from the motor shaft oil supply holes from being thrown out of the rotor, increases the amount of cooling oil sprayed into the second central hole from the motor shaft oil supply holes, and helps to improve the heat dissipation performance of the rotor. In addition, the cooling oil sprayed from the motor shaft oil supply holes is also used to cool and lubricate the bearing of the motor shaft, which helps to improve the heat dissipation performance and service life of the generator.

[0009] In an implementation, the rotor includes a first core and a second core, the first core is used to fixedly connect the motor shaft, and the second core is fixed to the first core. The inner diameter of the central hole of the first core is smaller than the inner diameter of the central hole of the second core, the motor shaft passes through the central hole of the first core and extends into the central hole of the second core, the central hole of the second core surrounds the bearing of the motor shaft, and a plurality of oil inlet holes are distributed on the inner circumferential surface of the central hole of the second core or the end surface of the first core facing the second core.

[0010] The annular retaining ring is arranged as the anti-throwing structure of the cooling oil of the inner wall of the central hole of the second core, effectively preventing the cooling oil of the inner wall of the central hole of the second core from being thrown out of the rotor, and increasing the oil inlet amount of the plurality of oil inlet holes on the inner circumferential surface of the second core. The bearing of the motor shaft is arranged as the anti-throwing structure of the cooling oil of the end surface of the first core facing the second core, effectively preventing the cooling oil of the end surface of the first core facing the second core from being thrown out of the rotor, and increasing the oil inlet amount of the plurality of oil inlet holes of the end surface of the first core facing the second core. For different positions of the second central hole of the rotor, different anti-throwing structures are flexibly arranged by using the components of the rotor, the oil inlet amount of the oil inlet holes of the rotor is increased, and the heat dissipation performance of the rotor of the generator is further improved.

[0011] In an implementation, the first core includes a plurality of radial grooves distributed on the end surface of the first core facing the second core in the circumferential direction of the generator. The spacing between each radial groove and the axis of the generator is greater than the inner radius of the central hole of the first core and smaller than the inner radius of the central hole of the second core, and the second core is used to partially shield a part of each radial groove. That is, the radial grooves extend from the area where the first core is exposed to the central hole of the second core to the area where the first core is shielded by the second core, and each radial groove forms an oil inlet hole of the rotor. Under the action of centrifugal force, the cooling oil of the area where the first core is exposed to the central hole of the second core and the cooling oil of the inner wall of the central hole of the second core are thrown into the radial grooves of the first core, reducing the oil resistance of the oil inlet inside the rotor. In addition, a part of the radial grooves forms an axial gap between the first core and the second core, and the cooling oil flowing into the radial grooves cools the first core and the second core of the rotor respectively, improving the heat dissipation effect of the rotor.

[0012] In an implementation, the side of the first core facing the second core includes a first lamination, the first lamination including a plurality of first radial through holes and a plurality of first magnet holes, each first radial through hole for transmitting cooling oil, and each first magnet hole for accommodating a magnet. The plurality of first radial through holes are spaced along the circumference of the generator, and the plurality of first magnet holes are spaced along the circumference of the generator. Each first radial through hole is arranged between the central hole of the first lamination and one first magnet hole along the radial direction of the generator. That is, the first radial through hole is not in communication with the central hole of the first lamination or the first magnet hole, and the first radial through hole serves as an oil inlet hole of the first core of the rotor, increasing the amount of cooling oil from the area of the first lamination exposed to the central hole of the second core and the inner wall of the central hole of the second core into the internal flow channel of the first core, and improving the heat dissipation performance of the rotor of the generator.

[0013] In an implementation, the first core includes a second lamination arranged on the side of the first lamination facing away from the second core, the second lamination including a plurality of second radial through holes and a plurality of second magnet holes, each second radial through hole for transmitting cooling oil, and each second magnet hole for communicating with one first magnet hole. The plurality of second radial through holes are spaced along the circumference of the generator, and the plurality of second magnet holes are spaced along the circumference of the generator. Each second radial through hole is for communicating with one second magnet hole along the radial direction of the generator, and the length of each second radial through hole is less than the length of the first radial through hole and greater than the spacing between the first radial through hole and the first magnet hole.

[0014] Correspondingly, the second radial through hole communicates the first radial through hole and the second magnet hole. The first radial through hole is for guiding the cooling oil from the area of the first core exposed to the central hole of the second core and the inner wall of the central hole of the second core into the second radial through hole, and the second radial through hole is for guiding the cooling oil received from the first radial through hole into the second magnet hole. That is, the first radial through hole and the second radial through hole together guide the cooling oil from the area of the first core exposed to the central hole of the second core and the inner wall of the central hole of the second core along the radial direction of the generator into the magnet holes of the first core, and the magnets of the magnet holes of the first core are immersed and cooled, improving the heat dissipation effect of the rotor. In addition, the first radial through hole and the second radial through hole are distributed in different laminations of the first core, ensuring the strength of the first lamination and the second lamination of the first core.

[0015] In one implementation, the end surface of the first core facing the second core includes a plurality of oil outlets, each of which is configured to output the cooling oil transmitted by the internal flow channel of the first core. Each of the oil outlets is spaced apart from the axis of the generator by a distance greater than the inner radius of the central hole of the first core and less than the inner radius of the central hole of the second core. In other words, the oil outlets of the first core are distributed in the region of the first core exposed to the central hole of the second core, and the second core avoids the cooling oil sprayed by the oil outlets of the first core so that the central hole of the second core can collect the cooling oil sprayed by the oil outlets of the first core without obstruction.

[0016] In one implementation, the inner circumferential surface of the second core includes a plurality of oil inlets, each of which is distributed between the annular retainer and the first core. Accordingly, under the action of centrifugal force, the annular retainer effectively prevents the cooling oil on the inner wall of the central hole of the second core from being thrown out of the rotor, increases the amount of oil entering the plurality of oil inlets on the inner circumferential surface of the second core, and improves the heat dissipation performance of the rotor of the generator.

[0017] In one implementation, the second core is fixed between the annular retainer and the first core along the axial direction of the generator, and the outer diameter of the annular retainer is less than the outer diameter of the second core. Accordingly, the weight of the rotor is reduced, which helps to reduce the weight of the generator.

[0018] In one implementation, the second core includes a plurality of oil outlets configured to discharge the cooling oil inside the rotor. The plurality of oil outlets are spaced apart and distributed on the end surface of the second core facing the annular retainer along the circumferential direction of the generator, and the annular retainer is configured to partially shield the oil outlets. Accordingly, the cross-sectional area of the cooling oil flowing out of the second core is smaller than the cross-sectional area of the cooling oil flowing through the oil outlets of the second core, and the flow rate of the cooling oil flowing out of the second core is greater than the flow rate of the cooling oil flowing through the second core, which accelerates the speed of the cooling oil flowing out of the rotor.

[0019] In one implementation, the annular retainer includes a plurality of through holes, each of which is configured to communicate with the internal flow channel of the second core. The plurality of through holes are spaced apart and distributed on the end surface of the annular retainer facing away from the second core along the circumferential direction of the generator, and the opening of each of the through holes faces the end winding of the stator. Accordingly, the cooling oil flowing out of the second core is sprayed on the end winding of the stator through the through holes of the annular retainer, which improves the heat dissipation effect of the stator of the generator and helps to improve the heat dissipation performance of the generator.

[0020] In an implementation form, the second core comprises a plurality of third laminations and at least one fourth lamination, the inner diameter of the central hole of the third laminations and the fourth laminations is larger than the inner diameter of the central hole of the first core, and the inner diameter of the central hole of the fourth laminations is smaller than the inner diameter of the central hole of the third laminations. The plurality of third laminations are arranged between the at least one fourth lamination and the first core, or the at least one fourth lamination is arranged between two third laminations. Correspondingly, the fourth laminations in the second core form an annular retaining ring, and the oil inlet hole of the rotor is located in the third lamination between the fourth lamination and the first core. The fourth lamination effectively prevents the cooling oil in the inner hole wall of the third lamination between the fourth lamination and the first core from being thrown out of the fourth lamination, increases the oil inlet amount of the oil inlet hole between the fourth lamination and the first core, and helps to improve the heat dissipation performance of the rotor.

[0021] In a second aspect, a range extended power assembly is provided, the range extended power assembly comprising an electric machine controller and the generator as described in the first aspect and any implementation form thereof, the generator being configured to receive a driving current from an engine and generate an electric current, and the electric machine controller being configured to charge a power battery of an electric vehicle using the electric current generated by the generator.

[0022] The rotor of the generator provided by the embodiments of the present application has improved heat dissipation performance, which helps to improve the overall performance of the range extended power assembly.

[0023] In a third aspect, a range extended electric vehicle is provided, the range extended electric vehicle comprising a power battery and the range extended power assembly as described in the second aspect, the range extended power assembly being configured to charge the power battery.

[0024] The rotor of the generator provided by the embodiments of the present application has improved heat dissipation performance, which helps to improve the overall performance of the range extended power assembly. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 A schematic diagram of the range extended electric vehicle provided by the embodiments of the present application.

[0026] Figure 2 A schematic diagram of the generator provided by the embodiments of the present application.

[0027] Figure 3 A schematic diagram of the rotor provided by the embodiments of the present application.

[0028] Figure 4 Another schematic diagram of the rotor provided by the embodiments of the present application.

[0029] Figure 5 Another schematic diagram of the rotor provided by the embodiments of the present application.

[0030] Figure 6Another schematic view of a rotor provided for embodiments of the present application.

[0031] Figure 7 Another schematic view of a rotor provided for embodiments of the present application.

[0032] Figure 8 and Figure 9 Another schematic view of a rotor provided for embodiments of the present application.

[0033] Figure 10 Another schematic view of a rotor provided for embodiments of the present application.

[0034] Figure 11 Another schematic view of a rotor provided for embodiments of the present application.

[0035] Figure 12 Another schematic view of a rotor provided for embodiments of the present application.

[0036] Figure 13 Another schematic view of a rotor provided for embodiments of the present application.

[0037] Figure 14 Another schematic view of a rotor provided for embodiments of the present application.

[0038] Figure 15 Another schematic view of a first lamination provided for embodiments of the present application.

[0039] Figure 16 Another schematic view of a rotor provided for embodiments of the present application.

[0040] Figure 17 Another schematic view of a first lamination provided for embodiments of the present application.

[0041] Figure 18 Another schematic view of a rotor provided for embodiments of the present application.

[0042] Figure 19 Another schematic view of a first lamination provided for embodiments of the present application.

[0043] Figure 20 Another schematic view of a rotor provided for embodiments of the present application.

[0044] Figure 21 Another schematic view of a second lamination provided for embodiments of the present application.

[0045] Figure 22 Another schematic view of a first core provided for embodiments of the present application.

[0046] Figure 23 Another schematic view of a rotor provided for embodiments of the present application.

[0047] Figure 24 Another schematic view of a rotor provided for embodiments of the present application.

[0048] Figure 25 Another schematic view of a rotor provided for embodiments of the present application.

[0049] Figure 26 Another schematic view of a rotor provided for embodiments of the present application.

[0050] Figure 27 A schematic view of an oil guide tab provided for embodiments of the present application.

[0051] Figure 28 A schematic view of a third tab provided for embodiments of the present application.

[0052] Figure 29 Another schematic view of a rotor provided for embodiments of the present application.

[0053] Figure 30 Another schematic view of a third tab provided for embodiments of the present application.

[0054] Figure 31 Another schematic view of a third tab provided for embodiments of the present application.

[0055] Figure 32 Another schematic view of a rotor provided for embodiments of the present application.

[0056] Figure 33 A schematic view of a second core provided for embodiments of the present application.

[0057] Figure 34 Another schematic view of a rotor provided for embodiments of the present application.

[0058] Figure 35 Another schematic view of a rotor provided for embodiments of the present application.

[0059] Figure 36 Another schematic view of a rotor provided for embodiments of the present application.

[0060] Figure 37 and Figure 38 Another schematic view of a rotor provided for embodiments of the present application.

[0061] Figure 39 and Figure 40 Another schematic view of a rotor provided for embodiments of the present application. DETAILED DESCRIPTION

[0062] The technical solutions in the present application will be described below with reference to the drawings.

[0063] The "equal / equal to" in the present application is not strictly equal / equal to, but within the error allowable range. The "parallel" is not strictly parallel, but within the error allowable range. The "perpendicular" is not strictly perpendicular, but within the error allowable range.

[0064] In the embodiments of the present application, the same reference signs represent the same components or the same parts. In the embodiments of the present application, for a plurality of same parts, only one of the parts is labeled with a reference sign in the drawings. The reference signs are also applicable to other same parts or components. In addition, the sizes and dimensions of the parts shown in the drawings are only exemplary.

[0065] Figure 1 A schematic diagram of a range extended electric vehicle provided by an embodiment of the present application. The range extended electric vehicle provided by the embodiment of the present application is also referred to as a range extended electric vehicle, or simply as REEV.

[0066] As shown in Figure 1 , the range extended electric vehicle 1 comprises a range extended power assembly 10 and a power battery 20. The range extended power assembly 10 is configured to charge the power battery 20.

[0067] As shown in Figure 1 , the range extended power assembly 10 comprises a generator 100, a motor controller 200, and an engine 300. The engine 300 drives the generator 100 to generate electric current. The motor controller 200 is configured to charge the power battery 20 using the electric current generated by the generator 100.

[0068] In an embodiment, the range extended power assembly 10 is also configured to receive power supply from the power battery 20 and to convert electric energy into mechanical energy to drive the wheels of the range extended electric vehicle 1.

[0069] As shown in Figure 1 , the range extended power assembly 10 comprises a drive motor 400. The drive motor 400 receives power supply from the power battery 20 and drives the wheels of the range extended electric vehicle 1.

[0070] In an embodiment, as shown in Figure 1 , the range extended power assembly 10 comprises a speed reducer 500. The drive motor 400 is configured to drive the wheels of the range extended electric vehicle 1 through the speed reducer 500.

[0071] Figure 2 A schematic diagram of a generator provided by an embodiment of the present application. As shown in Figure 2As shown, the generator 100 includes a stator 110, a rotor 120, a motor shaft 130, and a housing 140. The housing 140 houses and secures the stator 110, which surrounds the rotor 120. The rotor 120 is fixedly connected to the motor shaft 130, which in turn drives the engine 300. During the rotation of the motor shaft 130 by the engine 300, the motor shaft 130 drives the rotor 120 to rotate. The rotor 120's rotation relative to the stator 110 generates a magnetic field, which in turn induces an electromotive force in the stator 110, thus generating electricity.

[0072] In one embodiment, the generator 100 and motor control 200 of the range-extended powertrain 10 are integrated in a housing 140, referred to as the housing of the range-extended powertrain 10. The housing 140 includes two accommodating cavities, one for accommodating the generator 100 and the other for accommodating the electrical components of the motor controller 200.

[0073] The stator 110 of the generator 100 includes a stator core and a stator winding. A central hole in the stator core surrounds the rotor 120. The stator winding is wound around the stator core. In one embodiment, the two end windings of the stator winding protrude from the stator core along the axial direction of the generator 100.

[0074] Figure 3 This is a schematic diagram of a rotor provided in an embodiment of this application. In one embodiment, the center hole O of the rotor 120 includes a first center hole O1 and a second center hole O2, which are connected along the axial direction of the generator 100. For example, as... Figure 3 As shown, the rotor 120 includes a first iron core 121 and a second iron core 122. The central hole 1211 of the first iron core 121 forms the first central hole O1 of the rotor 120, and the central hole 1221 of the second iron core 122 forms the second central hole O2 of the rotor 120. The central holes 1211 and 1211 of the first iron core 121 are connected along the axial direction of the generator 100 to form the central hole O of the rotor 120.

[0075] In this embodiment, the axial direction of the generator 100 can be understood as the axial direction of the stator 110, the axial direction of the rotor 120, the axial direction of the first iron core 121, the axial direction of the second iron core 122, the axial direction of each lamination of the first iron core 121, the axial direction of each lamination of the second iron core 122, the axial direction of the motor shaft 130, and the axial direction of the annular retaining ring 123.

[0076] The first center hole O1 is used to fixedly connect the motor shaft 130. For example, the first iron core 121 is used to fixedly connect the motor shaft 130. In one embodiment, the first center hole O1 of the rotor 120 is fixedly connected with the motor shaft 130. For example, the first iron core 121 is sleeved on the motor shaft 130, and the inner diameter of the center hole 1211 of the first iron core 121 is approximately equal to the diameter of the motor shaft 130. In one embodiment, the first center hole O1 of the rotor 120 is fixedly connected with the motor shaft 130 through a hub. For example, the hub is sleeved on the motor shaft 130, the first iron core 121 is sleeved on the hub, the inner diameter of the hub is approximately equal to the diameter of the motor shaft 130, and the inner diameter of the center hole 1211 of the first iron core 121 is approximately equal to the outer diameter of the hub. In one embodiment, the first center hole O1 of the rotor 120 is fixedly connected with the motor shaft 130 through a key. For example, the inner circumferential surface of the first iron core 121 and the outer circumferential surface of the motor shaft 130 are provided with key grooves, and the keys are respectively embedded in the key grooves of the inner circumferential surface of the first iron core 121 and the outer circumferential surface of the motor shaft 130, so as to realize the fixed connection between the first iron core 121 and the motor shaft 130.

[0077] The inner diameter D2 of the second center hole O2 is greater than the inner diameter D1 of the first center hole O1, and the motor shaft 130 passes through the first center hole O1 and extends into the second center hole O2. In other words, there is a radial gap between the second center hole O2 and the motor shaft 130 along the radial direction of the generator 100. There is no radial gap between the first center hole O1 and the motor shaft 130 along the radial direction of the generator 100, or there is a radial gap between the first center hole O1 and the motor shaft 130 along the radial direction of the generator 100, and a fixing member such as a hub is embedded in the radial gap, and the fixing member is used to fixedly connect the first center hole O1 and the motor shaft 130. For example, as shown in FIG. 1, the inner diameter D2 of the center hole 1221 of the second iron core 122 is greater than the inner diameter D1 of the center hole 1211 of the first iron core 121, and the motor shaft 130 passes through the center hole 1211 of the first iron core 121 and extends into the center hole 1221 of the second iron core 122. Figure 3

[0078] In addition, the second iron core 122 is fixed to the first iron core 121. For example, the first iron core 121 includes a plurality of connection holes distributed along the axial direction of the generator 100, the second iron core 122 includes a plurality of connection holes distributed along the axial direction of the generator 100, and a connecting member passes through one connection hole of the second iron core 122 and one connection hole of the first iron core 121 to fixedly connect the second iron core 122 and the first iron core 121.

[0079] In the embodiments of the present application, the radial direction of the generator 100 can be understood as the radial direction of the stator 110, the radial direction of the rotor 120, the radial direction of the first iron core 121, the radial direction of the second iron core 122, the radial direction of each lamination of the first iron core 121, the radial direction of each lamination of the second iron core 122, the radial direction of the motor shaft 130, and the radial direction of the annular retainer 123. ​

[0080] Figure 4 This is another schematic diagram of the rotor provided in an embodiment of this application. The second central hole O2 is used to collect cooling oil. For example, the central hole 1221 of the second iron core 122 is used to collect cooling oil. Figure 4 As shown, the rotor 120 includes an annular retaining ring 123, the inner diameter D3 of which is smaller than the inner diameter D2 of the second central hole O2. The annular retaining ring 123 is used to prevent the cooling oil collected in the second central hole O2 from being thrown out. In addition, the rotor 120 also includes a plurality of oil inlet holes 124. The plurality of oil inlet holes 124 are distributed on the side of the annular retaining ring 123 facing the first central hole O1, and each oil inlet hole 124 is used to guide the cooling oil collected in the second central hole O2 into the interior of the rotor 120.

[0081] The annular retaining ring 123 serves as an anti-splashing structure for the cooling oil inside the center hole 1221 of the second iron core 122. Under the action of centrifugal force, the annular retaining ring 123 effectively prevents the cooling oil in the second center hole O2 from being thrown out of the rotor 120, increases the amount of cooling oil in the second center hole O2 flowing into the multiple oil inlets 124 of the rotor 120, and improves the heat dissipation performance of the rotor 120 of the generator 100.

[0082] Figure 5 Another schematic diagram of the rotor provided in an embodiment of this application. In one embodiment, the second central hole O2 surrounds the bearing 150 of the motor shaft 130. For example, as Figure 5 As shown, the center hole 1221 of the second iron core 122 surrounds the bearing 150 of the motor shaft 130.

[0083] The bearing 150 of the motor shaft 130 serves as an anti-splash structure for the cooling oil on the end face 1212 of the first iron core 121 facing the second iron core 122. Under centrifugal force, it effectively prevents the cooling oil on the end face 1212 of the first iron core 121 from being thrown out of the rotor 120, increasing the oil intake of the multiple oil inlets 124 on the end face 1212 of the first iron core 121 facing the second iron core 122, thus helping to improve the heat dissipation performance of the rotor 120 of the generator 100. Furthermore, by flexibly utilizing different anti-splash structures on the rotor 120 components at different positions of the second center hole O2 of the rotor 120, the oil intake of the oil inlets 124 of the rotor 120 is increased, further improving the heat dissipation performance of the rotor 120 of the generator 100.

[0084] Figure 6 This is another schematic diagram of a generator provided for an embodiment of this application. In one embodiment, the second central hole O2 is used to collect cooling oil output from the housing 140. Figure 6As shown, the generator 100 comprises a shell oil supply hole 141, which is distributed on the inner wall 1411 of the shell 140 towards the second center hole O2. The radial shell oil supply hole 141 is spaced apart from the axis L of the generator 100 by a distance J1, which is smaller than the inner radius R2 of the second center hole O2. The shell oil supply hole 141 is used to output cooling oil to the second center hole O2. In the embodiments of the present application, the axis of the generator 100 can be understood as the axis of the stator 110, the axis of the rotor 120, the axis of the first iron core 121, the axis of the second iron core 122, the axis of each lamination of the first iron core 121, the axis of each lamination of the second iron core 122, the axis of the motor shaft 130, and the axis of the annular retainer 123.

[0085] In an embodiment, as shown in Figure 6 the inner radius R3 of the annular retainer 123 along the radial direction of the generator 100 is greater than the distance J1 between the shell oil supply hole 141 and the axis L of the generator 100. The annular retainer 123 along the axial direction of the generator 100 avoids the cooling oil sprayed by the shell oil supply hole 141, thereby increasing the amount of oil sprayed into the second center hole O2 by the shell oil supply hole 141.

[0086] Figure 7 Another schematic view of the rotor provided in the embodiments of the present application. In an embodiment, the second center hole O2 is used to collect the cooling oil output by the motor shaft 130. As shown in Figure 7 the generator 100 comprises a motor shaft oil supply hole 131, which is distributed on the outer circumferential surface of the section of the motor shaft 130 extending into the second center hole O2. The motor shaft oil supply hole 131 is used to output cooling oil to the second center hole O2.

[0087] In an embodiment, the number of motor shaft oil supply holes 131 is multiple, and the multiple motor shaft oil supply holes 131 are distributed on the outer circumferential surface of the section of the motor shaft 130 extending into the second center hole O2 along the circumferential direction of the generator 100, so that the second center hole O2 collects sufficient cooling oil.

[0088] In the embodiments of the present application, the circumferential direction of the generator 100 can be understood as the circumferential direction of the stator 110, the circumferential direction of the rotor 120, the circumferential direction of the first iron core 121, the circumferential direction of the second iron core 122, the circumferential direction of each lamination of the first iron core 121, the circumferential direction of each lamination of the second iron core 122, the circumferential direction of the motor shaft 130, and the circumferential direction of the annular retainer 123.

[0089] In an embodiment, as shown in Figure 7As shown, the oil supply hole 131 along the axial direction of the motor shaft of the generator 100 is located on the side of the bearing 150 of the motor shaft 130 facing the first central hole O1, that is, the oil supply hole 131 along the axial direction of the motor shaft of the generator 100 is located between the bearing 150 of the motor shaft 130 and the first core 121. Under the action of centrifugal force, the bearing 150 of the motor shaft 130 prevents the cooling oil sprayed out of the motor shaft oil supply hole 131 from being thrown out of the rotor 120, increases the amount of cooling oil sprayed into the second central hole O2 from the motor shaft oil supply hole 131, and helps to improve the heat dissipation performance of the rotor 120. In addition, the cooling oil sprayed out of the motor shaft oil supply hole 131 is also used to cool and lubricate the bearing 150 of the motor shaft 130, which helps to improve the heat dissipation performance and service life of the generator 100.

[0090] Figure 8 and Figure 9 are another schematic view of the rotor provided by the embodiments of the present application. In an embodiment, the second central hole O2 is used to collect the cooling oil output by the first core 121. As shown in Figure 8 , the end surface 1212 of the first core 121 facing the second core 122 includes a plurality of oil outlet holes 12121, and each oil outlet hole 12121 is used to output the cooling oil transmitted by an internal flow passage of the first core 121. As shown in Figure 9 , the distance J2 between each oil outlet hole 12121 and the axis L of the generator 100 is greater than the inner radius R1 of the central hole 1211 of the first core 121 and less than the inner radius R2 of the central hole 1221 of the second core 122, that is, the oil outlet holes 12121 of the first core 121 are distributed in the area of the end surface 1212 of the first core 121 exposed to the central hole 1221 of the second core 122, and the second core 122 avoids the cooling oil sprayed out of the oil outlet holes 12121 of the first core 121, so that the central hole 1221 of the second core 122 can collect the cooling oil sprayed out of the oil outlet holes 12121 of the first core 121 without obstruction.

[0091] In an embodiment, the cooling oil received by the oil outlet hole 12121 from the internal flow passage of the first core 121 is derived from the motor shaft 130. For example, the inner circumferential surface of the first core 121 includes a plurality of oil inlet holes, and each oil inlet hole of the inner circumferential surface of the first core 121 is used to communicate one oil outlet hole 12121 through one internal flow passage of the first core 121. The outer circumferential surface of the motor shaft 130 distributed in a section of the first central hole O1 includes a plurality of oil outlet holes, and each oil outlet hole of the motor shaft 130 is used to output cooling oil, and each oil inlet hole of the inner circumferential surface of the first core 121 is used to transmit the cooling oil output by one oil outlet hole of the motor shaft 130 to one oil outlet hole 12121 through one internal flow passage of the first core 121.

[0092] In one embodiment, the cooling oil received by the oil outlet 12121 from the internal flow channel of the first iron core 121 originates from the oil inlet 124 of the first iron core 121. A description of the oil inlet 124 of the first iron core 121 is provided below and will not be repeated here.

[0093] In one embodiment, the cooling oil received by the oil outlet 12121 from the internal flow channel of the first iron core 121 originates from the oil inlet 124 of the second iron core 122. A description of the oil inlet 124 of the second iron core 122 is provided below and will not be repeated here.

[0094] In one embodiment, such as Figure 4 As shown, the annular retaining ring 123 is distributed on the side of the second iron core 122 opposite to the first iron core 121. In this embodiment, the annular retaining ring 123 is an end plate of the rotor 120, a dynamic balancing plate, or at least one lamination at the end of the second iron core 122.

[0095] In one embodiment, the annular retaining ring 123 is an end plate or dynamic balancing plate of the rotor 120, and the second iron core 122 is fixed between the annular retaining ring 123 and the first iron core 121 along the axial direction of the generator 100. For example, the annular retaining ring 123 includes a plurality of connecting holes distributed circumferentially along the generator 100, and the connecting member passes through the connecting holes of the annular retaining ring 123, the connecting holes of the second iron core 122, and the connecting holes of the first iron core 121 in sequence to fix and connect the annular retaining ring 123, the second iron core 122, and the first iron core 121.

[0096] Figure 10 Another schematic diagram of a rotor provided for an embodiment of this application. For example, as shown... Figure 10 As shown, the second core 122 includes a plurality of third laminations 600 and at least one fourth lamination 700. The inner diameter D2 of the center hole of the third lamination 600 and the inner diameter D3 of the center hole of the fourth lamination 700 are larger than the inner diameter D1 of the center hole 1211 of the first core 121, and the inner diameter D3 of the center hole of the fourth lamination 700 is smaller than the inner diameter D2 of the center hole of the third lamination 600. At least one fourth lamination 700 is arranged on the side of the plurality of third laminations 600 opposite to the first core 121, and at least one fourth lamination 700 of the second core 122 forms an annular retaining ring 123.

[0097] In one embodiment, the annular retaining ring 123 is distributed between two laminations of the second iron core 122, that is, the annular retaining ring 123 is at least one lamination of the second iron core 122 at a non-end.

[0098] Figure 11 Another schematic diagram of a rotor provided in an embodiment of this application. Figure 10 compared to, Figure 11The difference between the rotor 120 shown is that at least one fourth lamination 700 of the second core 122 is arranged between two third laminations 600. As shown in the figure, Figure 11 At least one fourth lamination 700 of the second core 122 forms an annular retaining ring 123.

[0099] Figure 12 Another schematic diagram of the rotor provided by the embodiments of the present application is shown. In one embodiment, a plurality of oil inlet holes 124 are distributed on the end surface 1212 of the first core 121 facing the second core 122. For example, as shown in the figure, Figure 12 The first core 121 includes a plurality of radial grooves 1213 distributed on the end surface 1212 of the first core 121 along the circumference of the generator 100, and each radial groove 1213 forms an oil inlet hole 124. Under the action of centrifugal force, the cooling oil collected by the central hole 1221 of the second core 122 is guided into the interior of the rotor 120 through the radial grooves 1213.

[0100] Figure 13 Another schematic diagram of the rotor provided by the embodiments of the present application is shown. In one embodiment, as shown in the figure, Figure 13 The distance J3 between each radial groove 1213 and the axis L of the generator 100 is greater than the inner radius R1 of the central hole 1211 of the first core 121 and less than the inner radius R2 of the central hole 1221 of the second core 122, and the second core 122 is used to partially shield a portion of each radial groove 1213. That is, the radial groove 1213 extends from the area of the end surface 1212 of the first core 121 exposed to the central hole of the second core 122 to the area of the first core 121 shielded by the second core 122.

[0101] Under the action of centrifugal force, the cooling oil exposed to the central hole of the second core 122 on the end surface 1212 of the first core 121 and the cooling oil on the inner wall of the central hole 1221 of the second core 122 are thrown into the radial groove 1213 of the first core 121, reducing the oil resistance of the oil inlet inside the rotor 120. In addition, the second core 122 shields a portion of the radial groove 1213 to form an axial gap between the first core 121 and the second core 122, and the cooling oil flowing into the radial groove 1213 cools the first core 121 and the second core 122 of the rotor 120, respectively, improving the heat dissipation effect of the rotor 120.

[0102] In one embodiment, each radial recess 1213 of the end surface 1212 of the first core 121 is communicated with an oil outlet hole 12121 of the end surface 1212 of the first core 121 through an internal flow channel of the first core 121. The cooling oil outputted from the oil outlet hole 12121 of the first core 121 flows into the internal flow channel of the first core 121 through the radial recess 1213 of the first core 121, and then is outputted again from the oil outlet hole 12121 of the first core 121 along the internal flow channel of the first core 121, so as to realize the circulation flow of the cooling oil.

[0103] Figure 14 Another schematic view of the rotor provided by the embodiment of the present application is shown in FIG. 6. In one embodiment, as shown in FIG. 6, each radial recess 1213 of the end surface 1212 of the first core 121 is arranged adjacent to an oil outlet hole 12121 of the end surface 1212 of the first core 121 along the circumference of the generator 100. The amount of the cooling oil flowing into and out of the first core 121 along the circumference of the generator 100 is relatively uniform, so as to realize the uniform heat dissipation of the first core 121 along the circumference of the generator 100. Figure 14

[0104] Figure 15 A schematic view of the first punching provided by the embodiment of the present application is shown in FIG. 7. In one embodiment, the side of the first core 121 facing the second core 122 includes a first punching 800a, and the radial recess 1213 is distributed on the first punching 800a. That is, the radial recess 1213 is distributed on one punching of the end of the first core 121 facing the second core 122. For example, as shown in FIG. 7, the first punching 800a includes a plurality of first radial through holes 810, and the plurality of first radial through holes 810 are distributed at intervals along the circumference of the generator 100. Each first radial through hole 810 is used for transmitting the cooling oil, and each first radial through hole 810 forms a radial recess 1213. Figure 15

[0105] In one embodiment, each first radial through hole 810 guides the cooling oil into the internal flow channel of the first core 121 through the first magnetic steel hole 820 of the first punching 800a. As shown in FIG. 7, the first punching 800a further includes a plurality of first magnetic steel holes 820, and the plurality of first magnetic steel holes 820 are distributed at intervals along the circumference of the generator 100. Each first magnetic steel hole 820 is used for accommodating a magnetic steel. Each first radial through hole 810 is used for communicating with one first magnetic steel hole 820 along the radial direction of the generator 100, and each first radial through hole 810 guides the cooling oil into the first magnetic steel hole 820, so as to realize the immersion cooling of the magnetic steel of the first magnetic steel hole 820 of the first core 121, and improve the heat dissipation effect of the rotor 120. Figure 15

[0106] Another schematic view of the rotor provided by the embodiment of the present application is shown in FIG. 6. In one embodiment, as shown in FIG. 6, each radial recess 1213 of the end surface 1212 of the first core 121 is arranged adjacent to an oil outlet hole 12121 of the end surface 1212 of the first core 121 along the circumference of the generator 100. The amount of the cooling oil flowing into and out of the first core 121 along the circumference of the generator 100 is relatively uniform, so as to realize the uniform heat dissipation of the first core 121 along the circumference of the generator 100. Figure 16 Figure 16 ​​​As shown, the first core 121 includes a plurality of conventional punching sheets 800b, which are distributed on the side of the first punching sheet 800a away from the second core 122. Each conventional punching sheet 800b includes a plurality of third magnetic steel holes 821, the plurality of first magnetic steel holes 820 of the first punching sheet 800a and the plurality of third magnetic steel holes 821 of the plurality of conventional punching sheets 800b respectively communicate along the axial direction of the generator 100 to form a plurality of magnetic steel slots of the first core 121, each magnetic steel slot of the first core 121 serves as an internal flow channel of the first core 121, and the cooling oil introduced through each first radial through hole 810 is received through the third magnetic steel hole 821 of the first punching sheet 800a.

[0107] Figure 17 Another schematic diagram of the first punching sheet is provided for the embodiments of the present application. In an embodiment, each first radial through hole 810 introduces cooling oil into the internal flow channel of the first core 121 through the weight-reducing hole 811 of the first punching sheet 800a. As shown, Figure 17 As shown, the first punching sheet 800a includes a plurality of weight-reducing holes 811, which are spaced apart along the circumferential direction of the generator 100, and each first radial through hole 810 is used to communicate one weight-reducing hole 811 along the radial direction of the generator 100, and each first radial through hole 810 introduces cooling oil into the weight-reducing hole 811. Through one opening of the first punching sheet 800a, i.e., the weight-reducing hole 811, both oil passage and weight reduction functions are achieved, which reduces the number of openings of the first punching sheet 800a and increases the strength of the first punching sheet 800a.

[0108] As shown, Figure 17 In an embodiment, as shown, along the radial direction of the generator 100 away from the central hole O11 of the first punching sheet 800a, the width W1 of the weight-reducing hole 811 along the circumferential direction of the generator 100 decreases. During the rotation of the first punching sheet 800a along the circumferential direction of the generator 100, the stress borne by the weight-reducing hole 811 along the radial direction of the generator 100 away from the central hole O11 of the first punching sheet 800a is greater. The width of the side of the weight-reducing hole 811 away from the central hole O11 of the first punching sheet 800a is set to be smaller, which increases the structural strength of the first punching sheet 800a and ensures the reliable rotation of the first punching sheet 800a. The width of the side of the weight-reducing hole 811 close to the central hole O11 of the first punching sheet 800a is set to be larger, which can not only meet the stress requirement but also achieve the purpose of weight reduction.

[0109] As shown, Figure 17 In an embodiment, as shown, along the radial direction of the generator 100, the distance between the weight-reducing hole 811 and the central hole O11 of the first punching sheet 800a is smaller than the distance between the first magnetic steel hole 820 and the central hole O11 of the first punching sheet 800a. That is, the weight-reducing hole 811 is closer to the central hole O11 of the first punching sheet 800a than the first magnetic steel hole 820.

[0110] Figure 18 Another schematic view of the rotor provided by the embodiments of the present application. As shown in the figure, the first core 121 includes a plurality of conventional punching sheets 800e, which are distributed on the side of the first punching sheet 800a facing away from the second core 122. Each conventional punching sheet 800e includes a plurality of weight-reducing holes 811, and the plurality of weight-reducing holes 811 of the first punching sheet 800a and the plurality of weight-reducing holes 811 of the plurality of conventional punching sheets 800e are respectively connected in the axial direction of the generator 100 to form a plurality of axial weight-reducing holes 811, each of which serves as an internal flow channel of the first core 121, and receives the cooling oil introduced through each first radial through hole 810 via the weight-reducing hole 811 of the first punching sheet 800a. Figure 18

[0111] Another schematic view of the first punching sheet provided by the embodiments of the present application. Figure 19 Figure 19 As shown in the figure, in the radial direction of the generator 100, each first radial through hole 810 is arranged between the central hole O11 of the first punching sheet 800a and a first magnetic steel hole 820 at intervals. That is, the first radial through hole 810 is not connected with the central hole O11 of the first punching sheet 800a and the first magnetic steel hole 820, and the first radial through hole 810 serves as an oil inlet hole 124 of the first core 121 of the rotor 120, which increases the amount of cooling oil introduced into the internal flow channel of the first core 121 from the area of the first punching sheet 800a exposed to the central hole of the second core 122 and the inner wall of the central hole 1221 of the second core 122, and improves the heat dissipation performance of the rotor 120 of the generator 100.

[0112] In an embodiment, each first radial through hole 810 directly introduces cooling oil into the internal flow channel of the first core 121.

[0113] Figure 20 Another schematic view of the rotor provided by the embodiments of the present application. As shown in the figure, the first core 121 includes a plurality of conventional punching sheets 800c, which are distributed on the side of the first punching sheet 800a facing away from the second core 122. Each conventional punching sheet 800c includes a plurality of first oil holes 830, and each first radial through hole 810 of the first punching sheet 800a is used to connect one first oil hole 830 of adjacent conventional punching sheets 800c, and the plurality of first oil holes 830 of the plurality of conventional punching sheets 800c are connected in the axial direction of the generator 100 to form a plurality of first axial flow channels, each of which serves as an internal flow channel of the first core 121 and receives the cooling oil introduced through each first radial through hole 810. Figure 20

[0114] Another schematic view of the second punching sheet provided by the embodiments of the present application. Figure 21 Figure 22 ​​A schematic view of the first core provided by the embodiment of the present application. In an embodiment, the first core 121 comprises a second punching sheet 800d arranged on the side of the first punching sheet 800a away from the second core 122, and the radial grooves 1213 are distributed on the first punching sheet 800a and the second punching sheet 800d. That is, the radial grooves 1213 are distributed on two punching sheets arranged continuously at the end of the first core 121 towards the second core 122. For example, as shown in Figure 21 the second punching sheet 800d comprises a plurality of second radial through holes 840, which are spaced apart along the circumference of the generator 100. As shown in Figure 22 each second radial through hole 840 is used to communicate with one first radial through hole 810 along the radial direction of the generator 100, and each second radial through hole 840 is used to transmit the cooling oil from one first radial through hole 810. Each first radial through hole 810 and one second radial through hole 810 form a radial groove 1213, and the first radial through hole 810 and the second radial through hole 810 of each radial groove 1213 are distributed on different punching sheets of the first core 121, which ensures the strength of the first punching sheet 800a and the second punching sheet 800d of the first core 121.

[0115] In an embodiment, each second radial through hole 840 guides the cooling oil into the internal flow channel of the first core 121 through the second magnetic steel hole 850 of the second punching sheet 800d. As shown in Figure 21 the second punching sheet 800d further comprises a plurality of second magnetic steel holes 850, which are spaced apart along the circumference of the generator 100, and each second magnetic steel hole 850 is used to respectively communicate with one first magnetic steel hole 820 of the first punching sheet 800a and one second radial through hole 840. Each second radial through hole 840 guides the cooling oil transmitted by one first radial through hole 810 into the second magnetic steel hole 850, which performs immersion cooling on the magnetic steel of the second magnetic steel hole 850 of the first core 121, and improves the heat dissipation effect of the rotor 120.

[0116] In an embodiment, as shown in Figure 22 the length L2 of each second radial through hole 840 is less than the length L1 of the first radial through hole 810 and greater than the interval L3 between the first radial through hole 810 and the first magnetic steel hole 820 along the radial direction of the generator 100, which increases the oil amount collected by the first radial through hole 810 and accelerates the speed of the cooling oil guided from the second radial through hole 840 into the second magnetic steel hole 850.

[0117] Figure 23 Another schematic view of the rotor provided by the embodiment of the present application. As shown in Figure 23As shown, the first core 121 includes a plurality of conventional laminations 800f, which are distributed on the side of the second lamination 800d opposite to the first lamination 800a. Each conventional lamination 800f includes a plurality of fourth magnet holes 851. The plurality of first magnet holes 820 of the first lamination 800a, the plurality of second magnet holes 850 of the second lamination 800d, and the plurality of fourth magnet holes 851 of the plurality of conventional laminations 800f are respectively connected along the axial direction of the generator 100 to form a plurality of magnet slots of the first core 121. Each magnet slot of the first core 121 serves as an internal flow channel of the first core 121, receiving cooling oil introduced by each first radial through hole 810 through the second radial through hole 840 and the second magnet hole 850 of the second lamination 800d.

[0118] In one embodiment, each second radial through-hole 840 directly introduces cooling oil into the internal flow channel of the first iron core 121.

[0119] Figure 24 Another schematic diagram of a rotor provided for an embodiment of this application. For example... Figure 24 As shown, the first core 121 includes a plurality of conventional laminations 800g, which are distributed on the side of the second lamination 800d opposite to the first lamination 800a. Each conventional lamination 800g includes a plurality of second oil holes 860. Each second radial through hole 840 of the second lamination 800d is used to connect to one second oil hole 860 of an adjacent conventional lamination 800g. The plurality of second oil holes 860 of the plurality of conventional laminations 800g are connected along the axial direction of the generator 100 to form a plurality of second axial flow channels. Each second axial flow channel serves as an internal flow channel of the first core 121 and receives cooling oil introduced by each second radial through hole 8400.

[0120] In one embodiment, the second oil hole 860 of the conventional stamped sheet 800g is a weight-reduction hole for the conventional stamped sheet 800g. By achieving both oil passage and weight reduction through a single opening in the conventional stamped sheet 800g, the number of openings in the conventional stamped sheet 800g is reduced, thereby increasing the strength of the conventional stamped sheet 800g.

[0121] Figure 25 Another schematic diagram of a rotor provided for an embodiment of this application. In one embodiment, as shown... Figure 25 As shown, the second iron core 122 includes a plurality of internal flow channels 1223. Each internal flow channel 1223 of the second iron core 122 is connected to an internal flow channel 1214 of the first iron core 121. Each internal flow channel 1214 of the first iron core 121 is used to transfer cooling oil to an internal flow channel 1223 of the second iron core 122. The cooling oil flowing into each second radial through hole 840 of the first iron core 121 cools both the first iron core 121 and the second iron core 122, which helps to improve the heat dissipation effect of the rotor 120.

[0122] Figure 26 This is another schematic diagram of a rotor provided in an embodiment of this application. In one embodiment, a plurality of oil inlet holes 124 are distributed on the inner circumferential surface of the central hole 1221 of the second iron core 122. For example, as... Figure 26 As shown, the inner circumferential surface of the second iron core 122 includes multiple oil inlet holes 124, each of which is distributed between the annular retaining ring 123 and the first iron core 121. Under the action of centrifugal force, the annular retaining ring 123 effectively prevents the cooling oil on the inner wall of the central hole of the second iron core 122 from being thrown out of the rotor 120, increases the oil intake of the multiple oil inlet holes 124 on the inner circumferential surface of the second iron core 122, and improves the heat dissipation performance of the rotor 120 of the generator 100.

[0123] Figure 27 This is a schematic diagram of an oil guide plate provided in an embodiment of this application. In one embodiment, the second iron core 122 includes at least one oil guide plate 900, which is distributed between the annular retaining ring 123 and the first iron core 121. Multiple oil inlet holes 124 are distributed on the oil guide plate 900. Figure 27 As shown, the inner circumferential surface of the oil guide plate 900 includes a plurality of oil inlet holes 124. The plurality of oil inlet holes 124 are distributed at intervals along the circumference of the generator 100. The length L4 of each oil inlet hole 124 along the radial direction of the generator 100 is less than the height H of the oil guide plate 900. Each oil inlet hole 124 is used to guide cooling oil into the internal flow channel of the second iron core 122.

[0124] In one embodiment, such as Figure 27 As shown, the inner diameter of the oil guide punch 900 is larger than the inner diameter of the first iron core 121. In order to increase the strength of the oil guide punch 900 and reduce the number of openings in the oil guide punch 900, the oil guide punch 900 is not provided with magnet holes.

[0125] Figure 28 This is a schematic diagram of a third lamination provided in an embodiment of this application. Figure 29 This is another schematic diagram of a rotor provided in an embodiment of this application. The second core 122 includes a plurality of third laminations 600, such as... Figure 28 As shown, each third lamination 600 includes a plurality of magnet holes 610, which are spaced apart circumferentially along the generator 100, and each magnet hole 610 is used to accommodate a magnet. In one embodiment, as... Figure 29As shown, the plurality of magnetic steel holes 610 of the two adjacent third laminations 600 communicate along the axial direction of the generator 100 to form a magnetic steel slot of the second core 122, and the magnetic steel slot of the second core 122 serves as an internal flow channel 1223 of the second core 122. The plurality of oil inlet holes 124 of the oil guide lamination 900 and the plurality of magnetic steel holes 610 of the adjacent third laminations 600 communicate along the axial direction of the generator 100, and each oil inlet hole 124 of the oil guide lamination 900 guides cooling oil into one magnetic steel hole 610 of each third lamination 600 of the second core 122 to immerse and cool the magnetic steel of the magnetic steel hole 610 of the first core 121, thereby improving the heat dissipation effect of the rotor 120. In addition, the magnetic steel hole of the third lamination 600 serves as an oil hole to realize oil passage and magnetic steel accommodation, thereby reducing the number of openings of the third lamination 600 and increasing the strength of the third lamination 600.

[0126] Figure 30 Another schematic view of the third lamination provided in the embodiments of the present application is provided. In an embodiment, as shown in Figure 30 each third lamination 600 includes a plurality of magnetic steel holes 610 and a plurality of oil holes 620, the plurality of oil holes 620 are distributed at intervals along the circumferential direction of the generator 100, and along the radial direction of the generator 100, the interval between the oil hole 620 and the center hole O21 of the third lamination 600 is smaller than the interval between the magnetic steel hole 610 and the center hole O21 of the third lamination 600. The plurality of oil holes 620 of the two adjacent third laminations 600 communicate along the axial direction of the generator 100 to form an internal flow channel 1223 of the second core 122. The plurality of oil inlet holes 124 of the oil guide lamination 900 and the plurality of oil holes 620 of the adjacent third laminations 600 communicate along the axial direction of the generator 100, and each oil inlet hole 124 of the oil guide lamination 900 guides cooling oil into one oil hole 620 of each third lamination 600 of the second core 122 to realize cooling of the first core 121.

[0127] In an embodiment, the oil hole 620 is a weight-reducing hole, and the oil hole 620 realizes oil passage and weight reduction, thereby reducing the number of openings of the third lamination 600 and increasing the strength of the third lamination 600.

[0128] Figure 31 Another schematic view of the third lamination provided in the embodiments of the present application is provided. In an embodiment, as shown in Figure 31As shown, along the radial direction of the generator 100 away from the center hole O21 of the third lamination 600, the width W2 of the oil hole 620 along the circumference of the generator 100 decreases. During the circumferential rotation of the third lamination 600 along the generator 100, the stress borne by the oil hole 620 along the radial direction of the generator 100 away from the center hole of the third lamination 600 is greater. Setting the width of the oil hole 620 on the side away from the center hole O21 of the third lamination 600 increases the structural strength of the third lamination 600, ensuring its reliable rotation. Setting the width of the oil hole 620 on the side closer to the center hole O21 of the third lamination 600 satisfies stress requirements while also achieving weight reduction.

[0129] Figure 32 This is another schematic diagram of the rotor provided in an embodiment of this application. In one embodiment, the annular retaining ring 123 is an end plate or dynamic balancing plate of the rotor 120, such as... Figure 32 As shown, the outer diameter OD1 of the annular retaining ring 123 is smaller than the outer diameter OD2 of the second iron core 122. That is, along the direction of the annular retaining ring 123 toward the second iron core 122, a portion of the second iron core 122 is exposed in the annular retaining ring 123, which reduces the weight of the rotor 120 and helps to make the generator 100 lighter.

[0130] Figure 33 This is a schematic diagram of a second iron core provided in an embodiment of this application. In one embodiment, as shown... Figure 33 As shown, the second iron core 122 includes a plurality of oil drain holes 125, which are distributed circumferentially around the generator 100 on the end face 1222 of the second iron core 122 facing the annular retaining ring 123. Each oil drain hole 125 is used to drain cooling oil from inside the rotor 120. For example, each oil drain hole 125 is used to connect to an internal flow channel 1223 of the second iron core 122, and each oil drain hole 125 is used to drain cooling oil from an internal flow channel 1223 of the second iron core 122.

[0131] In one embodiment, the oil drain hole 125 is the oil hole 620 of the third lamination 600 described above.

[0132] In one embodiment, the oil drain hole 125 of the second iron core 122 is the groove of the magnet groove of the second iron core 122 facing the annular retaining ring 123, the internal flow channel 1223 of the second iron core 122 is the magnet groove of the second iron core 122, and the oil drain hole 125 of the second iron core 122 is used to drain the cooling oil of the magnet groove of the second iron core 122.

[0133] In one embodiment, such as Figure 32As shown, the outer radius OR1 of the annular retaining ring 123 is greater than the interval J4 between the oil discharge hole 125 of the second core 122 and the axial direction L of the generator 100, and is less than the sum of the interval J4 between the oil discharge hole 125 of the second core 122 and the axial direction L of the generator 100 and the diameter d1 of the oil discharge hole 125 of the second core 122, and the annular retaining ring 123 is used to partially block the oil discharge hole 125. The cross-sectional area of the cooling oil flowing out of the second core 122 is less than the cross-sectional area of the cooling oil flowing through the oil discharge hole 125 of the second core 122, and the flow rate of the cooling oil flowing out of the second core 122 is greater than the flow rate of the cooling oil flowing through the second core 122, thereby accelerating the speed of the cooling oil flowing out of the rotor 120. In addition, the annular retaining ring 123 does not need to be provided with a through hole, and the discharge of the cooling oil in the interior of the rotor 120 is realized.

[0134] Figure 34 Another schematic view of the rotor provided by the embodiments of the present application. In an embodiment, as shown in Figure 34 The annular retaining ring 123 includes a plurality of through holes 1231, and each through hole 1231 is used to communicate the internal flow channel 1223 of the second core 122. The plurality of through holes 1231 are distributed on the end surface 1232 of the annular retaining ring 123 away from the second core 122 along the circumferential direction of the generator 100, and the opening of each through hole 1231 faces the end winding of the stator 110. The cooling oil flowing out of the second core 122 is sprayed on the end winding of the stator 110 through the through holes 1231 of the annular retaining ring 123, thereby improving the heat dissipation effect of the stator 110 of the generator 100 and helping to improve the heat dissipation performance of the generator 100.

[0135] Figure 35 Another schematic view of the rotor provided by the embodiments of the present application. In an embodiment, as shown in Figure 35 The first core 121 includes a plurality of internal flow channels 1214, and each internal flow channel 1214 of the first core 121 is used to communicate one internal flow channel 1223 of the second core 122, and each internal flow channel 1223 of the second core 122 is used to transmit cooling oil to one internal flow channel 1214 of the first core 121. The cooling oil flowing into each oil inlet hole 124 of the inner circumferential surface of the second core 122 cools the first core 121 and the second core 122, thereby helping to improve the heat dissipation effect of the rotor 120.

[0136] In an embodiment, the number of third punching sheets 600 between the oil guide punching sheet 900 and the first core 121 is less than the number of third punching sheets 600 between the oil guide punching sheet 900 and the annular retaining ring 123. That is, the cooling oil introduced into the rotor 120 by the oil inlet hole 124 of the second core 122 is closer to the first core 121, thereby reducing the deviation of the distribution amount of the cooling oil introduced into the first core 121 and the second core 122, making the cooling effects of the first core 121 and the second core 122 balanced, and avoiding the occurrence of local hot spots.

[0137] In one embodiment, a portion of the plurality of oil inlet holes 124 are distributed on the end surface 1212 of the first iron core 121 facing the second iron core 122, and another portion of the plurality of oil inlet holes 124 are distributed on the inner peripheral surface of the central hole 1221 of the second iron core 122. For details, please refer to the relevant description above, which will not be repeated here.

[0138] Figure 36 Another schematic diagram of the rotor provided by the embodiments of the present application. In one embodiment, the central hole O of the rotor 120 includes a first central hole O1 and two second central holes O2, the first central hole O1 is distributed between the two second central holes O2, and one of the two second central holes O2, the first central hole O1, and the other of the two second central holes O2 are sequentially communicated along the axial direction of the generator shaft 100. For example, as shown in Figure 4 the rotor 120 includes a first iron core 121, two second iron cores 122a and 122b, the central hole 1211 of the first iron core 121 forms the first central hole O1 of the rotor 120, the central hole 1221 of one of the two second iron cores 122a forms one of the second central holes O2 of the rotor 120, the central hole 1221 of the other of the two second iron cores 122b forms the other of the second central holes O2 of the rotor 120, and the central hole 1221 of the one second iron core 122a, the central hole 1211 of the first iron core 121, and the central hole 1221 of the other second iron core 122b are sequentially communicated along the axial direction of the generator 100 to form the central hole O of the rotor 120.

[0139] In addition, the two second iron cores 122a and 122b are respectively fixed on the two sides of the first iron core 121 along the axial direction of the generator 100. For example, the two second iron cores 122a and 122b respectively include a plurality of connection holes distributed along the axial direction of the generator 100, the second iron core 122 includes a plurality of connection holes distributed along the axial direction of the generator 100, and the connecting member passes through one of the connection holes of the second iron core 122a, one of the connection holes of the first iron core 121, and one of the connection holes of the second iron core 122b to fixedly connect the two second iron cores 122a and 122b and the first iron core 121.

[0140] In one embodiment, one of the two second central holes O2 is used to collect cooling oil, one of the two second central holes O2 and the plurality of oil inlet holes 124 are distributed on the side of the first central hole O1 facing the annular retaining ring 123, and the other of the two second central holes O2 is distributed on the side of the first central hole O1 away from the annular retaining ring 123. For example, the central hole 1221 of the second core 122a is used to collect cooling oil, the plurality of oil inlet holes 124 are distributed on the inner circumferential surface of the second core 122a, the plurality of oil inlet holes 124 are distributed on the end surface 1212 of the first core 121 facing the second core 122a, the annular retaining ring 123 is distributed on the side of the second core 122a away from the first core 121, or the annular retaining ring 123 is distributed between the two laminations of the second core 122a, the second core 122a and the plurality of oil inlet holes 124 are distributed on the side of the first core 121 facing the annular retaining ring 123, and the second core 122b is distributed on the side of the first core 121 away from the annular retaining ring 123.

[0141] Figure 37 and Figure 38 are another schematic view of the rotor provided by the embodiments of the present application. In one embodiment, as shown in Figure 37 and Figure 38 , each internal flow passage 1223 of the second core 122b is used to communicate with one internal flow passage 1214 of the first core 121, and each internal flow passage 1214 of the first core 121 is further used to transmit cooling oil to one internal flow passage 1223 of the second core 122b, so as to cool the second core 122b and help improve the heat dissipation effect of the rotor 120.

[0142] As shown in Figure 37 , under the action of centrifugal force, the cooling oil collected by the central hole 1221 of the second core 122a is thrown into the plurality of radial grooves 1213 of the first core 121, and is then distributed to flow into the internal flow passages 1223 of the second core 122a and the internal flow passages 1214 of the first core 121, so as to cool the second core 122a and the first core 121, respectively. Then, the cooling oil in the internal flow passages 1214 of the first core 121 flows into the internal flow passages 1223 of the second core 122b to cool the second core 122b.

[0143] As shown in Figure 38As shown, under the action of centrifugal force, the cooling oil collected by the central hole 1221 of the second core 122a is thrown into the multiple oil inlet holes 124 on the inner circumferential surface of the second core 122a, and is distributed into the internal flow channel 1223 of the second core 122a and the internal flow channel 1214 of the first core 121, respectively, to cool the second core 122a and the first core 121. Then, the cooling oil in the internal flow channel 1214 of the first core 121 flows into the internal flow channel 1223 of the second core 122b to cool the second core 122b.

[0144] Figure 39 and Figure 40 are another schematic view of the rotor provided by the embodiments of the present application. In an embodiment, as shown in Figure 39 and Figure 40 shown, the rotor 120 further includes an end plate 126, which is distributed on the side of the second core 122b away from the first core 121. The end plate 126 includes multiple through holes 1261, each of which is used to communicate with one internal flow channel 1223 of the second core 122b. The multiple through holes 1261 are distributed on the end surface 1262 of the end plate 126 away from the second core 122b along the circumference of the generator 100, and the opening of each through hole 1261 faces the end winding of the stator 110. The cooling oil flowing out of the second core 122b is sprayed on the end winding of the stator 110 through the through holes 1261 of the end plate 126, which improves the heat dissipation effect of the stator 110 of the generator 100 and helps to improve the heat dissipation performance of the generator 100.

[0145] In an embodiment, the outer diameter of the end plate 126 is smaller than the outer diameter of the second core 122b, that is, the part of the second core 122b in the direction of the end plate 126 towards the second core 122b is exposed to the end plate 126, which reduces the weight of the rotor 120 and helps to lighten the generator 100.

[0146] In an embodiment, the number of punched sheets of the second core 122a is greater than the number of punched sheets of the second core 122b. That is, the cooling oil introduced into the rotor 120 by the oil inlet holes 124 is closer to the first core 121, which reduces the deviation of the distribution amount of the cooling oil introduced into the two second cores 122a and 122b, makes the cooling effect of the two second cores 122a and 122b balanced, and avoids the occurrence of local hot spots.

[0147] For the contents not described about the first core 121, the two second cores 122a and 122b, the multiple oil inlet holes 124, and the annular retaining ring 123, please refer to the relevant description above, which will not be repeated here.

[0148] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A generator characterized by, The generator comprises a housing, a stator, a rotor and a motor shaft, the housing is used for containing and fixing the stator, the stator surrounds the rotor, the rotor is used for fixedly connecting the motor shaft, the rotor comprises: a central hole, the central hole comprises a first central hole and a second central hole, the first central hole and the second central hole are communicated along the axial direction of the generator, the first central hole is used for fixedly connecting the motor shaft, the motor shaft extends into the second central hole through the first central hole, the inner diameter of the second central hole is larger than the inner diameter of the first central hole, and the second central hole is used for collecting cooling oil; an annular baffle and a plurality of oil inlet holes, the inner diameter of the annular baffle is smaller than the inner diameter of the second central hole, the annular baffle is used for preventing the cooling oil collected in the second central hole from being thrown out, and the plurality of oil inlet holes are distributed on the side of the annular baffle facing the first central hole, and each oil inlet hole is used for guiding the cooling oil collected in the second central hole into the interior of the rotor.

2. The electric generator of claim 1, wherein, The generator comprises a housing oil supply hole, the housing oil supply hole is distributed on the inner wall of the housing facing the second central hole, and the inner radius of the annular baffle along the radial direction of the generator is larger than the distance between the housing oil supply hole and the axis of the generator.

3. The electric generator of claim 1 or 2, wherein, The generator comprises a motor shaft oil supply hole, the motor shaft oil supply hole is distributed on the outer circumferential surface of the motor shaft, and the motor shaft oil supply hole is located on the side of the bearing of the motor shaft facing the first central hole along the axial direction of the generator.

4. The electric generator of any one of claims 1-3, wherein, The rotor comprises a first iron core and a second iron core, the first iron core is used for fixedly connecting the motor shaft, and the second iron core is fixed to the first iron core, wherein: the inner diameter of the central hole of the first iron core is smaller than the inner diameter of the central hole of the second iron core, the motor shaft extends into the central hole of the second iron core through the central hole of the first iron core, the central hole of the second iron core surrounds the bearing of the motor shaft, and the plurality of oil inlet holes are distributed on the inner circumferential surface of the central hole of the second iron core or the end surface of the first iron core facing the second iron core.

5. The electric generator of claim 4, wherein, The first iron core comprises a plurality of radial grooves, the plurality of radial grooves are distributed on the end surface of the first iron core facing the second iron core along the circumferential direction of the generator, wherein: the distance between each radial groove and the axis of the generator is greater than the inner radius of the central hole of the first iron core and smaller than the inner radius of the central hole of the second iron core, and the second iron core is used for partially shielding a part of each radial groove.

6. The electric generator of claim 4 or 5, wherein, The side of the first iron core facing the second iron core comprises a first punching sheet, the first punching sheet comprises a plurality of first radial through holes and a plurality of first magnetic steel holes, each first radial through hole is used for transmitting cooling oil, and each first magnetic steel hole is used for containing a magnetic steel, wherein: along the circumferential direction of the generator, the plurality of first radial through holes are spaced apart, and the plurality of first magnetic steel holes are spaced apart; along the radial direction of the generator, each first radial through hole is arranged between the central hole of the first punching sheet and one first magnetic steel hole.

7. The electric generator of claim 6, wherein, The first core comprises second punching sheets arranged on the side of the first punching sheets away from the second core, the second punching sheets comprise a plurality of second radial through holes and a plurality of second magnetic steel holes, each of the second radial through holes is used for transmitting cooling oil, and each of the second magnetic steel holes is used for communicating with one of the first magnetic steel holes, wherein: Along the circumference of the generator, the plurality of second radial through holes are distributed at intervals, and the plurality of second magnetic steel holes are distributed at intervals; Along the radial direction of the generator, each of the second radial through holes is used for communicating with one of the second magnetic steel holes, and the length of each of the second radial through holes is smaller than the length of the first radial through hole and greater than the interval between the first radial through hole and the first magnetic steel hole.

8. The electric generator of any one of claims 4-7, wherein, The end surface of the first core towards the second core comprises a plurality of oil outlet holes, and each of the oil outlet holes is used for outputting the cooling oil transmitted by the internal flow channel of the first core. The distance between each of the oil outlet holes and the axis of the generator is greater than the inner radius of the central hole of the first core and smaller than the inner radius of the central hole of the second core.

9. The electric generator of any one of claims 4-8, wherein, The inner circumferential surface of the second core comprises a plurality of oil inlet holes, and each of the oil inlet holes of the inner circumferential surface of the second core is distributed between the annular retainer and the first core.

10. The electric generator of claim 9, wherein, The second core is fixed between the annular retainer and the first core along the axial direction of the generator, and the outer diameter of the annular retainer is smaller than the outer diameter of the second core.

11. The electric generator of claim 10, wherein, The second core comprises a plurality of oil discharge holes used for discharging the cooling oil inside the rotor, wherein: The plurality of oil discharge holes are distributed at intervals on the end surface of the second core towards the annular retainer along the circumferential direction of the generator, and the annular retainer is used for partially shielding the oil discharge holes.

12. The electric generator of claim 10, wherein, The annular retainer comprises a plurality of through holes, and each of the through holes is used for communicating with the internal flow channel of the second core, wherein: The plurality of through holes are distributed at intervals on the end surface of the annular retainer away from the second core along the circumferential direction of the generator, and the opening of each of the through holes is directed towards the end winding of the stator.

13. The electric generator of claim 9, wherein, The second core comprises a plurality of third punching sheets and at least one fourth punching sheet, the inner diameter of the central hole of the third punching sheet and the fourth punching sheet is greater than the inner diameter of the central hole of the first core, and the inner diameter of the central hole of the fourth punching sheet is smaller than the inner diameter of the central hole of the third punching sheet, wherein: The plurality of third punching sheets are arranged between the at least one fourth punching sheet and the first core, or the at least one fourth punching sheet is arranged between two third punching sheets.

14. A range extended powertrain, characterized in that, The extended-range power assembly comprises a motor controller and a generator as claimed in any one of claims 1 to 13, the generator is used for generating electric current by receiving the driving of the engine, and the motor controller is used for charging the power battery of the electric vehicle by using the electric current generated by the generator.

15. A range extended electric vehicle, characterized by, The extended-range electric vehicle comprises a power battery and an extended-range power assembly as claimed in claim 14, and the extended-range power assembly is used for charging the power battery.

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