Extended-range driving system with conjugate stator motor and vehicle

Abstract

The utility model provides a range extending type driving system with a conjugate stator motor and a vehicle. The driving system comprises a conjugate stator motor, an engine, a gear transmission mechanism and a differential mechanism. In the axial direction of the driving system, the engine and the gear transmission mechanism are located on the two sides of 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, and the outer motor comprises an outer motor stator and an outer motor rotor. The inner motor stator and the outer motor stator share the stator iron core. The inner motor rotor is in torsion-resistant connection with the differential through the gear transmission mechanism, and the outer motor rotor is in torsion-resistant connection with the engine. Therefore, a clutch is not used in the driving system, so that the driving efficiency of the driving system is improved, and the energy consumption of the whole vehicle is reduced. In addition, the range extending type driving system is simple in structure, the size and the weight of the driving system can be effectively reduced, the space utilization rate is increased, and the overall layout and the lightweight design of the vehicle are better facilitated.

Description

Technical Field

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

[0002] Among the vehicles currently used as transportation vehicles, there are many types of vehicles, typically including hybrid vehicles and range-extended electric vehicles.

[0003] In hybrid vehicle drive systems, the engine and motor can be designed in parallel, allowing the vehicle to achieve pure electric drive, pure engine drive, and a hybrid drive using both the motor and engine. However, some existing hybrid vehicle drive systems have certain technical problems. For example, Chinese invention patent application CN114761265A discloses a drive unit and drive assembly applicable to hybrid vehicles. In this patented technology, the engine and drive unit (hybrid transmission) are connected by a gear set for anti-torsional connection, with the clutch located on the axial side of the motor. In this case, the drag loss of the clutch may negatively affect the driving efficiency of pure electric drive. Furthermore, adding a clutch and its actuation system to the drive system not only increases the cost of the vehicle but also complicates the design of the vehicle transmission and increases the packaging space of the transmission.

[0004] Range-extended electric vehicles (REEVs) are electric vehicles equipped with a range extender. Their main characteristic is that the vehicle can operate solely on electric motors, with the engine used for power generation instead of direct vehicle propulsion. When the battery is low, the engine in the range extender starts to charge the battery, extending the vehicle's range and effectively solving the problem of insufficient driving range in electric vehicles. Compared to hybrid vehicles, REEVs do not directly use the engine to drive the vehicle. Instead, the engine provides torque to a generator, which then generates electricity, which is converted into torque to drive the vehicle. This design allows REEVs to provide a smooth driving experience similar to pure electric vehicles, offering a superior electrified driving experience compared to hybrid vehicles. Therefore, designing the vehicle's drive system as a range-extended drive system to overcome the problems of hybrid vehicle drive systems described above, thereby improving the efficiency of pure electric mode and reducing costs, has become a current development direction in vehicle technology. Utility Model Content

[0005] 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 drive efficiency and reduce overall vehicle energy consumption, helping to reduce the size and weight of the range-extended drive system and achieve a more compact layout. Another objective of this application is to provide a vehicle including the aforementioned range-extended drive system with a conjugate stator motor.

[0006] To achieve the above objectives, the present application may adopt the following technical solutions.

[0007] This application provides a range-extended drive system with a conjugate stator motor, including a conjugate stator motor, an engine, a gear transmission mechanism, and a differential.

[0008] In the axial direction of the range-extended drive system, the engine and the gear transmission mechanism are located on both sides of the conjugate stator motor.

[0009] The 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 common stator core.

[0010] The inner motor rotor is torsionally connected to the differential via the gear transmission mechanism, and the outer motor rotor is torsionally connected to the engine.

[0011] In one alternative embodiment, a first shaft is further included, through which the internal motor rotor is torsionally connected to the gear transmission mechanism.

[0012] The external motor includes a rotor bracket that is torsionally connected to the external motor rotor, and the rotor bracket is torsionally connected to the engine.

[0013] The first shaft is coaxially arranged with the rotor support, and the first shaft extends into the rotor support.

[0014] In another alternative, a bearing is also included between the first shaft and the rotor support, allowing the first shaft and the rotor support to rotate freely relative to each other.

[0015] In another alternative, a shock absorber is also included, with the engine torsionally connected to the shock absorber, which is torsionally connected to the external motor rotor only through the rotor bracket.

[0016] In another alternative embodiment, the stator core comprises a plurality of stamped silicon steel sheets, which are stacked axially to form the core body.

[0017] The inner periphery of the iron core body is provided with multiple inner stator conductor slots, and the outer periphery of the iron core body is provided with multiple outer stator conductor slots.

[0018] In another alternative, the stator core, the inner motor rotor, and the outer motor rotor overlap each other in the axial direction.

[0019] In another alternative embodiment, the gear transmission mechanism includes a first gear pair, a second gear pair, and an intermediate shaft.

[0020] The first gear pair includes a first gear and a second gear that mesh with each other. The first gear is torsionally connected to the first shaft, and the second gear is torsionally connected to the intermediate shaft.

[0021] The second gear pair includes a third gear and a fourth gear that mesh with each other. The third gear is torsionally connected to the intermediate shaft, and the fourth gear constitutes the input gear of the differential.

[0022] In another alternative, two half-shafts are also included, which are torsionally connected to the gear transmission mechanism via the differential, allowing the two half-shafts to rotate at different speeds.

[0023] In another alternative, when viewed along at least one radial direction of the range-extended drive system, the conjugate stator motor at least partially overlaps with the differential.

[0024] This application also provides a vehicle including the range-extended drive system with a conjugate stator motor as described in any of the above technical solutions.

[0025] By adopting the above technical solution, this application provides a range-extended drive system with a conjugate stator motor and a vehicle including the drive system. The drive system includes a conjugate stator motor, an engine, a gear transmission mechanism, and a differential, all assembled together. Axially, the engine and gear transmission mechanism are located on either side of the conjugate stator motor. The 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 and outer motor stators share a common stator core. Further, the inner motor rotor is torsionally connected to the differential via the gear transmission mechanism, and the outer motor rotor is torsionally connected to the engine.

[0026] Thus, in the aforementioned vehicle drive system, the engine and gear transmission mechanism are located on opposite sides of the conjugate stator motor. The engine is torsionally connected to the outer rotor of the conjugate stator motor, driving it to generate electricity. The inner rotor of the conjugate stator motor outputs torque via the gear transmission mechanism for driving. This drive system constitutes a range-extended drive system. Furthermore, this range-extended drive system eliminates the need for a clutch, effectively avoiding the negative impact on drive efficiency caused by a clutch, thus improving drive system efficiency and reducing overall vehicle energy consumption. In addition, the range-extended drive system has a simple structure, effectively reducing the size and weight of the drive system, improving space utilization, and facilitating overall vehicle layout and lightweight design. Attached Figure Description

[0027] Figure 1 A schematic diagram of the topology of a range-extended drive system with a conjugate stator motor according to an embodiment of this application is shown.

[0028] Figure 2 It shows Figure 1 A schematic diagram of the stator core of a conjugate stator motor.

[0029] Explanation of reference numerals in the attached figures

[0030] 10. Conjugate stator motor;

[0031] 11. Internal motor;

[0032] 111 Inner motor stator; 112 Inner motor rotor; 113 First shaft; 114 Inner motor winding;

[0033] 12 external motors;

[0034] 121 External motor stator; 122 External motor rotor; 123 Rotor support; 124 External motor winding;

[0035] 110 Stator core; 117 Outer stator conductor slot; 118 Inner stator conductor slot; 119 Core body;

[0036] 20 Engines;

[0037] 21. Second axis;

[0038] 30. Gear transmission mechanism;

[0039] 31 First gear; 32 Second gear; 33 Third gear; 34 Fourth gear; 35 Intermediate shaft;

[0040] 40 Differential;

[0041] 50 shock absorbers;

[0042] 61, 62 half-shafts;

[0043] A is axial; R is radial; C is circumferential. 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 exhaust 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" refer to the axial, radial, and circumferential directions of the conjugate stator motor of the range-extended drive system of this application, respectively. Further, "radial outer side" refers to the side that is radially away from the central axis of the conjugate stator motor, and "radial inner side" refers to the side that is radially close to the central axis of the conjugate stator motor.

[0046] In this application, "torsional connection" refers to a connection between two components that can transmit torque, including direct or indirect connections. For example, the two components can be directly connected in a torsional manner via 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, a range-extended drive system with a conjugate stator motor according to an embodiment of this application may include a conjugate stator motor 10, an engine 20, a gear transmission mechanism 30, a differential 40, a shock absorber 50, and half shafts 61 and 62.

[0049] In this embodiment, as Figure 1 As shown, the conjugate stator motor 10 includes an inner motor 11 and an outer motor 12. Specifically, 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. The stator structures of the inner motor 11 and the outer motor 12 are integrated, reducing material redundancy. The inner motor rotor 112 and the outer motor rotor 122 can be completely decoupled, meaning that the inner motor rotor 112 and the outer motor rotor 122 can rotate independently of each other, i.e., operate at different speeds and directions.

[0050] In this embodiment, as Figure 2As shown, the stator core 110 comprises multiple stamped silicon steel sheets, which are stacked in the axial direction A to form the core body 119. The inner circumference of the core body 119 has multiple inner stator conductor slots 118, while the outer circumference has multiple outer stator conductor slots 117. It can be understood that, compared to the radially central portion of the core body 119 without slots, 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. Furthermore, the openings of the inner stator conductor slots 118 open radially inward towards the core body 119, and the openings of the outer stator conductor slots 117 open radially outward towards the core body 119. Specifically, the inner stator conductor slot 118 is used to install the stator winding of the inner motor 11, which serves as the inner motor winding 114; the outer stator conductor slot 117 is used to install the stator winding of the outer motor 12, which serves as the outer motor winding 124.

[0051] In this embodiment, as Figure 1 As shown, the internal motor 11 is an internal rotor motor, serving as the drive motor in the range-extended drive system. Specifically, the internal motor rotor 112 of the internal motor 11 is torsionally connected to the differential 40 via a gear transmission mechanism 30, and is used to drive the vehicle. The internal motor stator 111 can be fixed to the housing (not shown) of the drive system, while the internal motor rotor 112 is located radially inside the internal motor stator 111. Further, the first shaft 113 of the internal motor 11 extends into the hollow rotor support 123 and is coaxially arranged with the rotor support 123, and a bearing is provided between the first shaft 113 and the rotor support 123. Thus, the first shaft 113 of the internal motor 11 is rotatably supported by the housing and the rotor support 123 of the external motor 12 via multiple bearings.

[0052] In this embodiment, as Figure 1 As shown, the external motor 12 is an external rotor motor, which acts as a generator in the range-extended drive system to charge the power battery. Specifically, the engine 20 can be torsionally connected to the rotor support 123 of the external motor 12 via the shock absorber 50, thereby driving the external motor rotor 122 to rotate and generating electricity. In this embodiment, the torque of the engine 20 does not need to go through a clutch and can be directly transmitted to the rotor support 123. In this way, the torque of the engine 20 drives the external motor 12 to generate electricity through the second shaft 21, the shock absorber 50, and the rotor support 123, forming the power generation unit of the range-extended drive system. In addition, the rotor support 123 can be supported by the housing of the drive system through two coaxially arranged bearings.

[0053] In this embodiment, as Figure 1As shown, the gear transmission mechanism 30 includes a first gear pair, a second gear pair, and an intermediate shaft 35. The intermediate shaft 35 is arranged in parallel with the first shaft 113, and both ends of the intermediate shaft 35 are supported by the housing of the drive system through bearings.

[0054] Specifically, the first gear pair includes a first gear 31 and a second gear 32 meshing with each other. The first gear 31 is torsionally connected to the first shaft 113 of the internal motor 11, and the second gear 32 is torsionally connected to the intermediate shaft 35. The second gear pair includes a third gear 33 and a fourth gear 34 meshing with each other. The third gear 33 is torsionally connected to the intermediate shaft 35, and the fourth gear 34 constitutes the input gear of the differential 40. When the internal motor rotor 112 rotates, it drives the first gear 31 to rotate. Through the meshing of the first gear 31 and the second gear 32, the intermediate shaft 35 rotates, thereby driving the third gear 33 to rotate. Further, through the meshing of the third gear 33 and the fourth gear 34, the fourth gear 34 is driven to mesh. Finally, torque is transmitted to the wheels through the differential 40 and the two half-shafts 61 and 62, driving the vehicle to move.

[0055] In this embodiment, the differential 40 can be a bevel gear differential, and the fourth gear 34 can be fixed to the housing of the bevel gear differential to serve as the input gear of the differential 40. Bearings are respectively provided on the left and right sides of the housing of the differential 40, and the housing of the drive system can support the differential 40 via the bearings. The shock absorber 50 may include a flywheel mechanism. The shock absorber 50 is used to dampen the torsional vibration of the engine 20 and improve the working stability of the entire drive system. The shock absorber 50 is not only torsionalally connected to the engine 20 via the second shaft 21, but also torsionalally connected to the external motor rotor 122 only via the rotor bracket 123. The two half-shafts 61 and 62 can be torsionalally connected to the two output gears of the bevel gear differential, respectively, while also being torsionalally connected to the two wheels of the vehicle. Therefore, the differential 40 can not only transmit torque to the wheels via the two half-shafts 61 and 62, but also allow the two wheels to rotate at different speeds. In this embodiment, as... Figure 1 As shown, the half-shafts 61 and 62 are arranged parallel to each other with the first shaft 113 and the intermediate shaft 35.

[0056] Thus, in this embodiment, as Figure 1 As shown, the torque of the internal motor 11 drives the vehicle through the first shaft 113, the first gear 31, the second gear 32, the intermediate shaft 35, the third gear 33, the fourth gear 34, the differential 40, and the two half shafts 61 and 62, thus forming the drive unit of the range-extended drive system.

[0057] Furthermore, in this embodiment, when viewed along at least one radial direction R, the conjugate stator motor 10 and the differential 40 can partially overlap. That is, viewed from at least one radial direction R of the conjugate stator motor 10, the conjugate stator motor 10 and the differential 40 can be partially constructed to be located in the same axial position. This facilitates a reduction in the size of the range-extended drive system, thereby achieving a smaller overall shape and improving its compactness. Additionally, as... Figure 1 As shown, along the axial direction A of the range-extended drive system, the engine 20 and the gear transmission mechanism 30 are located on opposite sides of the conjugate stator motor 10.

[0058] This application provides a range-extended drive system with a conjugate stator motor 10. In this system, a clutch is not required, effectively avoiding the negative impact on drive efficiency caused by a clutch. This improves the drive system's efficiency and reduces overall vehicle energy consumption. Furthermore, the engine 20 and gear transmission mechanism 30 are located on opposite axial sides of the conjugate stator motor 10. The engine 20 is torsionally connected to the outer motor rotor 122 of the conjugate stator motor 10, directly driving the outer motor 122 to generate electricity. The inner motor rotor 112 of the conjugate stator motor 10 outputs torque via the gear transmission mechanism 30 for driving. This effectively reduces the size and weight of the drive system, improves space utilization, and is more conducive to the overall vehicle layout and lightweight design.

[0059] This application also provides a vehicle that includes the above-described range-extended drive system with a conjugate stator motor 10, which has the same effect as the range-extended drive system.

Claims

1. An extended range drive system having a coπspun motor, characterized by, including a cogged stator motor, an engine, a gear mechanism, and a differential, the engine and the gear mechanism are located on both sides of the cogged stator motor in an axial direction of the extended-range drive system, the cogged stator motor includes an inner motor including an inner motor stator and an inner motor rotor located radially inward of the inner motor stator, and an outer motor including 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 share a stator core, and the inner motor rotor is torsionally connected to the differential via the gear mechanism, and the outer motor rotor is torsionally connected to the engine.

2. The range extended drive system with a coned rotor electric machine of claim 1, wherein, further including a first shaft, the inner motor rotor is torsionally connected to the gear mechanism via the first shaft, the outer motor includes a rotor support torsionally connected to the outer motor rotor, the rotor support is torsionally connected to the engine, the first shaft is coaxially arranged with the rotor support, the first shaft extends into the rotor support.

3. The range extended drive system with a coned rotor electric machine according to claim 2, characterized in that, further including a bearing provided between the first shaft and the rotor support, so that the first shaft and the rotor support can freely rotate relative to each other.

4. The range extended drive system with a coned rotor electric machine of claim 2, wherein, further including a damper, the engine is torsionally connected to the damper, the damper is torsionally connected to the outer motor rotor only via the rotor support.

5. The extended-range drive system with a cogged stator motor according to any one of claims 1 to 4, wherein the stator core includes a plurality of silicon steel sheets punched out, the plurality of silicon steel sheets are stacked in the axial direction to form a core main body, an inner circumferential portion of the core main body is provided with a plurality of inner stator conductor grooves, and an outer circumferential portion of the core main body is provided with a plurality of outer stator conductor grooves.

6. The range extended drive system with a coned rotor electric machine according to claim 5, characterized in that, the stator core, the inner motor rotor, and the outer motor rotor overlap each other in the axial direction.

7. The range extended drive system with a coned rotor electric machine according to any one of claims 2 to 4, characterized in that, the gear mechanism includes a first gear pair, a second gear pair, and an intermediate shaft, the first gear pair includes a first gear and a second gear meshing with each other, the first gear is torsionally connected to the first shaft, and the second gear is torsionally connected to the 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 intermediate shaft, and the fourth gear constitutes an input gear of the differential.

8. The range extended drive system with a coned-rotor electric machine according to any one of claims 1 to 4, characterized in that, further including two half shafts, the two half shafts are torsionally connected to the gear mechanism via the differential, so that the two half shafts can rotate at different speeds.

9. The range extended drive system with a coned-rotor electric machine according to any one of claims 1 to 4, characterized in that, when viewed along at least one radial direction of the extended-range drive system, the cogged stator motor at least partially overlaps the differential.

10. A vehicle characterized by comprising: including the extended-range drive system with a cogged stator motor according to any one of claims 1 to 9.

Images