Extended range drive system with conjugate stator motor and vehicle

Abstract

The utility model provides an extended-range driving system with a conjugate stator motor and a vehicle. The range extending type driving system with the conjugate stator motor comprises the conjugate stator motor, the conjugate stator motor comprises an inner motor and an outer motor, the inner motor comprises an inner motor stator and an inner motor rotor located on the radial inner side of the inner motor stator, and the outer motor comprises an outer motor stator and an inner motor rotor located on the radial inner side of the outer motor stator. The outer motor comprises an outer motor stator and an outer motor rotor located on the radial outer side of the outer motor stator. The inner motor stator and the outer motor stator share a stator iron core. A first gear transmission mechanism, a second gear transmission mechanism and a differential mechanism; the engine is connected to the inner motor rotor through the first gear transmission mechanism and used for driving the inner motor to generate electricity, and the outer motor rotor is connected to the differential mechanism through the second gear transmission mechanism and used for driving the vehicle to run.

Description

Technical Field

[0001] This application relates to the field of vehicle drive system technology, and particularly to a range-extended drive system and vehicle with a conjugate stator motor. Background Technology

[0002] Electric motors have been widely used in new energy vehicles. As an example, CN114761265A discloses a drive unit and drive assembly. In this assembly, an internal combustion engine and a drive unit (hybrid transmission) are connected via a parallel gear set, and a clutch is located on the axial side of the internal electric motor.

[0003] Some existing technologies use hybrid / plug-in hybrid drive systems to allow the internal combustion engine to directly drive the vehicle. Because of this direct internal combustion engine drive, the electrification level of hybrid / plug-in hybrid drive systems is lower than that of pure electric / range-extended drive systems.

[0004] As direct-drive scenarios using internal combustion engines become less frequent, their impact on improving engine efficiency becomes less significant. Consequently, the market is seeing an increasing number of range-extended electric vehicles with ever-longer battery ranges.

[0005] As the battery range of range-extended electric vehicles continues to increase, the pure electric mode becomes more important. The clutch in the transmission will cause drag loss, which will have an adverse effect on the efficiency of the pure electric mode.

[0006] The clutch and its actuation system also increase costs, increase system complexity, and are not conducive to optimizing the size and weight of the transmission. Utility Model Content

[0007] In order to overcome or mitigate the shortcomings of the prior art, one objective of this application is to provide a range-extended drive system with a conjugate stator motor, which can improve the system transmission efficiency, reduce the energy consumption of the whole vehicle, and also help to reduce the size and weight of the range-extended drive system, and achieve a more compact layout.

[0008] To achieve the above-mentioned objectives, this application adopts the following technical solution.

[0009] One embodiment of this application provides a range-extended drive system with a conjugate stator motor, comprising:

[0010] A conjugate stator motor includes an inner motor and an outer motor. The inner motor includes an inner motor stator and an inner motor rotor located radially inside the inner motor stator. The outer motor includes an outer motor stator and an outer motor rotor located radially outside the outer motor stator. The inner motor stator and the outer motor stator share a stator core.

[0011] The first gear transmission mechanism, the second gear transmission mechanism, and the differential; and

[0012] The engine, connected to the internal motor rotor via a first gear transmission mechanism, is used to drive the internal motor to generate electricity.

[0013] The external motor rotor is connected to the differential via a second gear transmission mechanism to drive the vehicle.

[0014] In at least one embodiment, the inner motor rotor is rotatably connected to the outer motor rotor via bearings, and the inner motor rotor and the outer motor rotor are completely decoupled.

[0015] In at least one embodiment, the stator core includes multiple silicon steel sheets integrally stamped together. The multiple silicon steel sheets are stacked to form the core body. The inner periphery of the core body is provided with multiple inner stator conductor slots, and the outer periphery of the core body is provided with multiple outer stator conductor slots.

[0016] In at least one embodiment, the first gear transmission mechanism includes a first gear pair, which consists of a first gear in the form of an internal gear ring and a second gear in the form of an external gear. The first gear is connected to the engine, and the second gear is directly connected to the output shaft of the internal motor. The number of teeth of the second gear is less than the number of teeth of the first gear.

[0017] In at least one embodiment, the second gear transmission mechanism includes a second gear pair, a third gear pair, and an intermediate shaft. The second gear pair includes a third gear and a fourth gear meshing with each other. The third gear is torsionally connected to the external motor rotor, and the fourth gear is torsionally connected to the intermediate shaft.

[0018] The third gear pair includes a fifth gear and a sixth gear that mesh with each other. The fifth gear is torsionally connected to the intermediate shaft, and the sixth gear forms the input gear of the differential.

[0019] In at least one embodiment, the external motor rotor is torsionally connected to the third gear via a rotor support.

[0020] In at least one embodiment, the differential includes two half-shafts, with the output shaft of the internal motor, the intermediate shaft, and the half-shafts parallel to each other.

[0021] In at least one embodiment, when viewed along at least one radial direction of the conjugate stator motor, the first gear pair and the third gear pair overlap each other, and the second gear pair and the differential overlap each other.

[0022] In at least one embodiment, the engine and the conjugate stator motor are located on opposite sides of the first gear pair and the second gear pair, respectively.

[0023] One embodiment of this application also provides a vehicle that includes the range-extended drive system with a conjugate stator motor of this application.

[0024] As described above, the embodiments of this application provide a range-extended drive system with a conjugate stator motor. This drive system uses a conjugate stator motor and does not use a clutch between the motor and the gear transmission mechanism. Therefore, it is beneficial to improve the transmission efficiency of the system and reduce the energy consumption of the whole vehicle. At the same time, it is beneficial to reduce the size and weight of the range-extended drive system, thereby achieving a more compact drive system layout. Attached Figure Description

[0025] Figure 1 A schematic diagram of a range-extended drive system with a conjugate stator motor according to one embodiment of this application is shown.

[0026] Figure 2 It shows Figure 1 A schematic diagram of the stator core of a conjugate stator motor.

[0027] Explanation of reference numerals in the attached figures

[0028] 10. Conjugate stator motor;

[0029] 11. Internal motor;

[0030] 110 Stator core; 111 Inner motor stator; 112 Inner motor rotor; 113 Output shaft;

[0031] 12 external motors;

[0032] 121 External motor stator; 122 External motor rotor; 123 Rotor support;

[0033] 117 Outer stator conductor slot; 118 Inner stator conductor slot; 119 Core body;

[0034] 20 Engines;

[0035] 21. Engine output shaft;

[0036] 30. First gear transmission mechanism;

[0037] 31 First gear; 32 Second gear; 311 Mounting shaft of the first gear;

[0038] 40. Second gear transmission mechanism;

[0039] 41 Third gear; 42 Fourth gear; 43 Fifth gear; 44 Sixth gear; 45 Intermediate shaft;

[0040] 50 differential;

[0041] 51, 52 half-shafts;

[0042] 60 shock absorber;

[0043] A represents the axial direction; R represents the radial direction; C represents the circumferential direction. Detailed Implementation

[0044] Exemplary embodiments of this application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are for teaching those skilled in the art how to implement this application only, and are not intended to exhaustively describe all possible methods of this application, nor to limit the scope of this application.

[0045] In this application, unless otherwise specified, "axial", "radial", and "circumferential" represent the axial, radial, and circumferential directions of the inner motor shaft, respectively. Further, "radial outer" refers to the side that is radially away from the central axis of the inner motor shaft, and "radial inner" refers to the side that is radially close to the central axis of the inner motor shaft.

[0046] In this application, an anti-torsion connection refers to a connection capable of transmitting torque; for example, an anti-torsion connection can be achieved through a spline.

[0047] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0048] like Figure 1 As shown, embodiments of this application provide a range-extended drive system with a conjugate stator motor, which may include a conjugate stator motor 10, an engine 20, a first gear transmission mechanism 30, a second gear transmission mechanism 40, a differential 50, and a shock absorber 60.

[0049] In this embodiment, such as Figure 1 As shown, the conjugate stator motor 10 includes an inner motor 11 and an outer motor 12. The inner motor 11 includes an inner motor stator 111 and an inner motor rotor 112 located radially inside the inner motor stator 111; the outer motor 12 includes an outer motor stator 121 and an outer motor rotor 122 located radially outside the outer motor stator 121. In the conjugate stator motor 10, the inner motor stator 111 and the outer motor stator 121 share the same stator core 110.

[0050] like Figure 2 As shown, in this embodiment, the stator core 110 includes multiple silicon steel sheets integrally stamped, which are stacked to form the core body 119. Multiple inner stator conductor slots 118 are provided on the inner periphery of the core body 119, while multiple outer stator conductor slots 117 are provided on the outer periphery. It can be understood that the inner stator conductor slots 118 are located radially inward of the core body 119, while the outer stator conductor slots 117 are located radially outward of the core body 119. The multiple outer stator conductor slots 117 can be evenly spaced along the circumferential direction C, and the multiple inner stator conductor slots 118 can be evenly spaced along the circumferential direction C.

[0051] Furthermore, the slot opening of the inner stator conductor slot 118 faces the radially inner side of the core body 119, and the slot opening of the outer stator conductor slot 117 faces the radially outer side of the core body 119. Specifically, the inner stator conductor slot 118 is used to install the stator winding of the inner motor 11, forming the inner motor winding 114; the outer stator conductor slot 117 is used to install the stator winding of the outer motor 12, forming the outer motor winding 124.

[0052] In this embodiment, the internal motor 11 is an internal rotor motor, which acts as a generator in the range-extended drive system to charge the power battery. Specifically, the engine 20 is connected to the internal motor rotor 112 via the first gear transmission mechanism 30, thereby driving the internal motor rotor 112 to rotate and realize the internal motor 11 generating electricity.

[0053] like Figure 1 As shown, the inner motor stator 111 is fixed to the housing, while the inner motor rotor 112 is located radially inside the inner motor stator 111. The output shaft 113 of the inner motor 11 is rotatably supported on the housing by at least one bearing. The inner motor rotor 112 is fixed to one end of the output shaft 113, and the other end of the output shaft 113 is connected to the first gear transmission mechanism 30, and further connected to the output shaft 21 of the engine 20.

[0054] In this embodiment, the external motor 12 is an external rotor motor, which serves as the drive motor in the range-extended drive system. Specifically, the external motor rotor 122 is connected to the differential 50 via the second gear transmission mechanism 40, thereby driving the vehicle.

[0055] like Figure 1 As shown, the external motor stator 121 is fixed on the housing, and the external motor rotor 122 is located on the radial outside of the external motor stator 121. It is torsionally connected to the second gear transmission mechanism 40 through the rotor bracket 123, and then connected to the differential 50 to drive the vehicle.

[0056] In this embodiment, such as Figure 1 As shown, the inner motor rotor 112 is rotatably connected to the outer motor rotor 122 via a bearing, and the outer motor rotor bracket 123 can be directly mounted on the bearing.

[0057] In this embodiment, the inner motor rotor 112 and the outer motor rotor 122 can be completely decoupled. This range-extended drive system does not have a clutch, therefore the inner motor rotor 112 and the outer motor rotor 122 can rotate independently, enabling the vehicle to operate in different working modes.

[0058] like Figure 1As shown, in this embodiment, the first gear transmission mechanism 30 includes a first gear pair, which is composed of a first gear 31 in the form of an internal gear ring and a second gear 32 in the form of an external gear. The second gear 32 has fewer teeth than the first gear 31.

[0059] Furthermore, the first gear 31, the shock absorber 60, and the engine 20 are connected in sequence. Specifically, the first gear 31 and the shock absorber 60 are respectively mounted on the mounting shaft 311 of the first gear 31, and the other end of the shock absorber 60 is connected to the output shaft 21 of the engine 20. The mounting shaft 311 of the first gear 31 can be mounted on the housing of the range-extended drive system through two coaxially arranged and axially close bearings.

[0060] Furthermore, the second gear 32 is directly connected to the output shaft 113 in a torsion-resistant manner, and one end of the output shaft 113 is connected to the internal motor rotor 112. In this way, when the engine 20 is working, it can drive the first gear 31 to rotate, and the first gear 31 meshes with the second gear 32, thereby driving the internal motor rotor 112 to rotate.

[0061] In this embodiment, the power of the engine 20 drives the internal motor 11 to generate electricity through the shock absorber 60, the first gear 31, the second gear 32, the output shaft 113, and the internal motor rotor 112, thus forming the power generation unit of the range-extended drive system.

[0062] In this embodiment, such as Figure 1 As shown, the second gear transmission mechanism 40 includes a second gear pair, a third gear pair, and an intermediate shaft 45. The intermediate shaft 45 is arranged parallel to the output shaft 113. Both ends of the intermediate shaft 45 are supported by a bearing.

[0063] Specifically, the second gear pair consists of a third gear 41 and a fourth gear 42 that mesh with each other, with the third gear 41 supported by a bearing. The third gear 41 is torsionally connected to the external motor rotor 122, and the fourth gear 42 is torsionally connected to the intermediate shaft 45. The third gear pair includes a fifth gear 43 and a sixth gear 44 that mesh with each other, with the fifth gear 43 torsionally connected to the intermediate shaft 45. The sixth gear 44 constitutes the input gear of the differential 50 and is also the final reduction gear of this range-extended drive system.

[0064] It is understandable that when the external motor rotor 122 rotates, it drives the third gear 41 to rotate as well. Since the third gear 41 meshes with the fourth gear 42, the fifth gear 43 rotates. Through the meshing of the fifth gear 43 with the sixth gear 44, the fifth gear 43 is driven to mesh. Finally, the power is transmitted to the wheels through the differential 50.

[0065] In this embodiment, such as Figure 1As shown, the power of the external motor 12 drives the vehicle through the third gear 41, the fourth gear 42, the intermediate shaft 45, the fifth gear 43, the sixth gear 44, and the differential 50, thus forming the drive unit of the range-extended drive system.

[0066] Furthermore, in this embodiment, the differential 50 may include two half-shafts 51 and 52. A bearing is provided on each of the left and right sides of the housing of the differential 50 for supporting the differential 50.

[0067] Preferably, in this embodiment, such as Figure 1 As shown, the output shaft 113, intermediate shaft 45, and half shafts 51 and 52 of the internal motor 11 are arranged in parallel to each other.

[0068] Furthermore, in this embodiment, when viewed along at least one radial direction R of the conjugate stator motor 10, it can be observed that the first gear pair and the third gear pair overlap each other, and the second gear pair and the differential 50 overlap each other. It can be understood that, viewed from the radial direction R of the conjugate motor 10, the first gear pair and the third gear pair are located in the same axial position; similarly, the second gear pair and the differential 50 are also located in the same axial position. This facilitates a reduction in the radial dimensions of the range-extended drive system, thereby enabling a smaller overall shape and improving its compactness.

[0069] Furthermore, such as Figure 1 As shown, the engine 20 and the conjugate stator motor 11 are located on both sides of the axial direction A of the first gear pair and the second gear pair, respectively.

[0070] The range-extended drive system with a conjugate stator motor provided in this application eliminates the need for a clutch between the motor and the gear transmission mechanism because it uses a conjugate stator motor 10. Therefore, it eliminates the need for clutch engagement or disengagement to achieve different operating modes for the drive system. The absence of a clutch improves the transmission efficiency of the range-extended drive system and reduces overall vehicle energy consumption. Furthermore, it allows for a further reduction in the size and weight of the range-extended drive system, resulting in a more compact drive system layout.

[0071] This application also provides a vehicle that includes the above-described range-extended drive system with a conjugate stator motor.

Claims

1. An extended range drive system having a coπspun motor, characterized by, Comprise: a conjugate stator motor, which comprises an inner motor and an outer motor, the inner motor comprising an inner motor stator and an inner motor rotor located radially inward of the inner motor stator, the outer motor comprising an outer motor stator and an outer motor rotor located radially outward of the outer motor stator, the inner motor stator and the outer motor stator sharing a stator core; a first gear transmission mechanism, a second gear transmission mechanism and a differential; and an engine connected to the inner motor rotor via the first gear transmission mechanism for driving the inner motor to generate electricity, the outer motor rotor connected to the differential via the second gear transmission mechanism for driving the vehicle to travel.

2. The range extended drive system with a coned rotor electric machine according to claim 1, characterized in that, The inner motor rotor is rotationally connected to the outer motor rotor via a bearing, and the inner motor rotor and the outer motor rotor are completely decoupled.

3. The range extended drive system with a coned rotor electric machine of claim 1, wherein, The stator core comprises a plurality of silicon steel sheets integrally punched, and the plurality of silicon steel sheets are stacked to form a core body, an inner circumferential portion of the core body is provided with a plurality of inner stator conductor grooves, and an outer circumferential portion of the core body is provided with a plurality of outer stator conductor grooves.

4. The range extended drive system with a coned rotor electric machine of claim 1, wherein, The first gear transmission mechanism comprises a first gear pair composed of a first gear in the form of an inner ring gear and a second gear in the form of an external gear, the first gear is connected to the engine, and the second gear is directly connected to the output shaft of the inner motor, and the number of teeth of the second gear is less than that of the first gear.

5. The range extended drive system with a co-axial stator motor of claim 4, wherein, The second gear transmission mechanism comprises a second gear pair, a third gear pair and an intermediate shaft, the second gear pair comprises a third gear and a fourth gear meshing with each other, the third gear is torsionally connected to the outer motor rotor, and the fourth gear is torsionally connected to the intermediate shaft, The third gear pair comprises a fifth gear and a sixth gear meshing with each other, the fifth gear is torsionally connected to the intermediate shaft, and the sixth gear constitutes an input gear of the differential.

6. The range extended drive system with a coned rotor electric machine according to claim 5, characterized in that, The outer motor rotor is torsionally connected to the third gear via a rotor support.

7. The range extended drive system with a coned rotor electric machine of claim 5, wherein, The differential comprises two half shafts, and the output shaft of the inner motor, the intermediate shaft and the half shafts are parallel to each other.

8. The range extended drive system with a coned rotor electric machine of claim 5, wherein, When viewed in at least one radial direction of the conjugate stator motor, the first gear pair and the third gear pair overlap each other, and the second gear pair and the differential overlap each other.

9. The range extended drive system with a coned rotor electric machine of claim 5, wherein, The engine and the conjugate stator motor are respectively located on the axial sides of the first gear pair and the second gear pair.

10. A vehicle characterized by comprising: The range extending drive system with a conjugate stator motor according to any one of claims 1 to 9. The range extending drive system with a conjugate stator motor according to any one of claims 1 to 9.

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