Range extender system and vehicle

Abstract

The utility model discloses a range extender system and a vehicle, and the range extender system comprises an engine which is provided with a crankshaft; the generator comprises a stator, a rotor and a transmission shaft, the rotor sleeves the transmission shaft and is connected with the transmission shaft, the rotor is rotatably arranged in the stator, and one end of the crankshaft in the axial direction is fixedly connected with the transmission shaft to drive the generator to generate electricity; the cooling system is used for cooling the generator and comprises a driving mechanism for driving cooling liquid to flow, and an input shaft of the driving mechanism is coaxial with the transmission shaft. According to the range extender system provided by the utility model, the generator can be cooled, reliable operation of the generator is ensured, the structure is compact, and the occupied space can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of automobiles, and more particularly to a range extender system and a vehicle. Background Art

[0002] In the related art, during the operation of the generator, the stator and rotor of the generator will generate heat, resulting in reduced efficiency and heat loss, affecting the working efficiency of the generator and the normal operation of the range extender system. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a range extender system that can cool the generator to ensure reliable operation of the generator and has a compact structure to reduce space occupation.

[0004] Another object of the present invention is to provide a vehicle having the above-mentioned range extender system.

[0005] According to an embodiment of the present invention, the range extender system includes: an engine having a crankshaft; a generator, the generator including a stator, a rotor and a transmission shaft, the rotor being sleeved on and connected to the transmission shaft, the rotor being rotatably disposed in the stator, and one end of the crankshaft in the axial direction being fixedly connected to the transmission shaft to drive the generator to generate electricity; a cooling system, the cooling system being used to cool the generator and including a drive mechanism for driving the flow of coolant, the input shaft of the drive mechanism being coaxial with the transmission shaft.

[0006] According to the range extender system of the present invention, a rotor is sleeved on and connected to a drive shaft, the rotor is rotatably disposed within a stator, and one end of the crankshaft in the axial direction is fixedly connected to the drive shaft to drive the generator to generate electricity. While balancing the unevenness of engine operation and absorbing impact loads, the flywheel torque reducer located at the end of the engine in related art is eliminated, and the axial length of the engine and generator is reduced, ensuring a compact structure of the range extender system. At the same time, it can avoid NVH issues caused by high-speed rotation, thereby improving the overall power density and efficiency of the range extender, reducing the volume and production cost of the range extender system, and facilitating improved assembly efficiency. In addition, a cooling system is used to cool the generator and includes a drive mechanism for driving the flow of coolant. The input shaft of the drive mechanism is coaxial with the drive shaft, allowing the generator to be fully cooled, preventing damage to the generator, and facilitating improved power density of the generator, ensuring the normal operation of the range extender system, and making the range extender system compact and effectively utilizing space, thereby facilitating improved space utilization.

[0007] In addition, the range extender system according to the above embodiment of the present invention may also have the following additional technical features:

[0008] According to the range extender system of some embodiments of the present invention, the crankshaft and the transmission shaft are connected by fasteners.

[0009] According to some embodiments of the present invention, one end of the transmission shaft away from the crankshaft is connected to the input shaft.

[0010] According to some embodiments of the present invention, the cooling system further includes: a spray pipe, the spray pipe is located in the generator and is connected to the drive mechanism, the spray pipe is provided with a spray hole, and the spray hole is located radially outside the stator.

[0011] According to some embodiments of the present invention, the spray holes are multiple and spaced apart along the length direction of the spray pipe, and at least some of the spray holes are located at both ends of the stator in the axial direction.

[0012] According to some embodiments of the present invention, the transmission shaft has an oil supply channel and a spray hole connected to the oil supply channel, and the driving mechanism is connected to the oil supply channel.

[0013] According to some embodiments of the present invention, an oil collector for collecting oil is further provided in the generator, and the oil collector is located below the stator and is connected to the driving mechanism.

[0014] According to some embodiments of the present invention, the generator further includes: a first shell, the rotor and the stator are both disposed in the first shell, and the stator is interference fit with the first shell or connected by fasteners.

[0015] According to some embodiments of the present invention, a avoidance hole is provided on the first shell, the transmission shaft is passed through the avoidance hole to be connected with the crankshaft, and a sealing member is provided between the outer peripheral wall of the transmission shaft and the hole wall of the avoidance hole.

[0016] According to some embodiments of the present invention, the driving mechanism is a mechanical oil pump.

[0017] A vehicle according to an embodiment of the present invention includes the range extender system according to an embodiment of the present invention.

[0018] According to the vehicle of the embodiment of the present invention, the rotor is sleeved on and connected to the drive shaft, the rotor is rotatably disposed within the stator, and one end of the crankshaft in the axial direction is fixedly connected to the drive shaft to drive the generator to generate electricity. While being able to balance the unevenness of engine operation and absorb impact loads, the flywheel torque reducer located at the end of the engine in the related art is eliminated, and the axial length of the engine and generator is reduced, ensuring the compact structure of the range extender system. At the same time, it can avoid NVH problems caused by high-speed rotation, thereby improving the overall power density and efficiency of the range extender, reducing the volume and production cost of the range extender system, and facilitating improved assembly efficiency. In addition, the cooling system is used to cool the generator and includes a drive mechanism for driving the flow of coolant. The input shaft of the drive mechanism is coaxial with the drive shaft, so that the generator can be fully cooled, avoiding damage to the generator, and facilitating the improvement of the power density of the generator, ensuring the normal operation of the range extender system, and making the range extender system compact and effectively utilizing space, which is conducive to improving space utilization.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 Schematic diagram of the structure of the range extender system according to an embodiment of the present utility model.

[0022] Reference numerals:

[0023] 100. Range extender system;

[0024] 10. Engine; 11. Crankshaft; 12. Second housing;

[0025] 20. Generator; 21. Stator; 22. Rotor; 23. Drive shaft; 24. Oil collector; 25. First housing; 26. Seal; 231. Spray hole; 251. Avoidance hole;

[0026] 30. Cooling system; 31. Driving mechanism; 32. Spray pipe; 321. Spray hole. DETAILED DESCRIPTION

[0027] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0029] In the description of the present invention, "first feature" and "second feature" may include one or more such features, "plurality" means two or more, the first feature "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features not being in direct contact but being in contact through another feature between them, the first feature "above", "above" and "above" the second feature include the first feature being directly above and diagonally above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0030] The range extender system 100 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0031] Reference Figure 1 As shown, the range extender system 100 according to an embodiment of the present invention may include: an engine 10 and a generator 20 .

[0032] Specifically, the engine 10 has a crankshaft 11, and the generator 20 includes a stator 21, a rotor 22, and a transmission shaft 23. The rotor 22 is sleeved on the transmission shaft 23 and connected to the transmission shaft 23. The rotor 22 is rotatably arranged in the stator 21. One end of the crankshaft 11 in the axial direction (for example, Figure 1The right end (shown in FIG) is fixedly connected to a drive shaft 23. Thus, the engine 10 generates power by burning fuel, driving the crankshaft 11 to continuously rotate and output mechanical work. The crankshaft 11 drives the drive shaft 23, which is fixedly connected to the crankshaft 11, to rotate coaxially and at the same speed. The drive shaft 23 then drives the rotor 22, which is connected to the drive shaft 23, to rotate together, allowing the rotor 22 to rotate within the stator 21. The windings in the stator 21 cut through the magnetic flux lines to generate an induced electromotive force, thereby generating three-phase alternating current, enabling the generator 20 to generate electricity and meet the required power generation requirements.

[0033] By fixing one end of the crankshaft 11 in the axial direction to the drive shaft 23, the rotational inertia of the generator 20 itself can be used to replace the function of the flywheel. While balancing the unevenness of the engine 10 during operation and absorbing the impact load, the flywheel torque reducer located at the end of the engine in the related art can be omitted, ensuring the reliable operation of the engine 10, and reducing the axial length of the engine 10 and the generator 20, ensuring the compact structure of the range extender system 100. At the same time, due to the rigid direct connection of the shaft system and the small axial length, the required bearings can be eliminated, thereby reducing the part structure, cost and weight, further reducing the assembly process, and helping to improve assembly efficiency.

[0034] In addition, the need to increase the generator speed by adding a gear speed-increasing mechanism in the related art can be eliminated. The present invention can avoid NVH problems caused by high-speed rotation by allowing the generator 20 to work efficiently at a lower speed. For example, it improves the gear whine problem that is prone to occur after the generator 20 is increased in speed, and can avoid the gear transmission loss caused by the gear speed-increasing mechanism, thereby improving the overall success rate density and efficiency of the range extender, helping to extend the life of the generator 20, and improving the overall durability of the range extender system 100. It can also reduce production costs, reduce volume and weight, thereby facilitating the reduction of the volume and production costs of the range extender system 100.

[0035] In related technologies, during the operation of the generator, the stator and rotor will generate heat, resulting in reduced efficiency and heat loss. For example, the stator windings and the rotor's magnetic steel and silicon steel sheets are prone to heat, affecting the working efficiency of the generator. The accumulation of heat can lead to problems such as winding damage and magnetic steel demagnetization, which can easily cause damage to the generator and affect the normal operation of the range extender system.

[0036] Therefore, in the present invention, if Figure 1As shown, the range extender system 100 also includes a cooling system 30, which is capable of cooling the generator 20. The cooling system 30 includes a drive mechanism 31, which is capable of driving the flow of coolant to facilitate control of the coolant cooling the generator 20, ensuring the flow rate and flow rate of the coolant, so that the generator 20 can be adequately cooled, that is, the stator 21 and the rotor 22 can be adequately cooled. By precisely controlling the speed and coolant flow rate of the drive mechanism 31, the temperature of the generator 20 can be precisely controlled, ensuring that the generator 20 operates within the optimal temperature range, preventing damage to the generator 20, and facilitating the improvement of the power density of the generator 20 and ensuring the normal operation of the range extender system 100. At the same time, the input shaft of the drive mechanism 31 is coaxial with the transmission shaft 23, which can make the range extender system 100 compact and effectively utilize space, thereby improving space utilization.

[0037] It should be noted that, for the convenience of description, the directions such as “left” and “right” in the present invention are based on the direction relationship shown in the accompanying drawings, and are not limitations on the directions in actual application.

[0038] In some embodiments, the generator 20 is formed as a flat generator 20 . The flat generator 20 has a compact structure and occupies a small space, thereby reducing the occupied space of the range extender system 100 and facilitating a miniaturized design of the range extender system 100 .

[0039] In some embodiments, an end plate is fixed to the drive shaft 23, and fasteners are provided through the end plate to connect it to the rotor 22, so that the end plate can be press-fitted and fixed to the rotor 22, ensuring that the rotor 22 is securely fixed to the drive shaft 23, preventing the rotor 22 from moving on the drive shaft 23, and ensuring that the rotor 22 and the drive shaft 23 rotate reliably at the same speed, thereby ensuring reliable operation of the generator 20. For example, the fasteners are bolts.

[0040] According to the range extender system 100 of the embodiment of the present invention, the rotor 22 is sleeved on and connected to the transmission shaft 23, the rotor 22 is rotatably disposed in the stator 21, and one end of the crankshaft 11 in the axial direction is fixedly connected to the transmission shaft 23 to drive the generator 20 to generate electricity. While being able to balance the unevenness of the engine 10 during operation and absorb impact loads, the flywheel torque reducer located at the end of the engine in the related art is eliminated, and the axial length of the engine 10 and the generator 20 can be reduced, ensuring the compact structure of the range extender system 100, while avoiding NVH problems caused by high-speed rotation, thereby improving the overall success rate density and efficiency of the range extender, reducing the volume and production cost of the range extender system 100, and helping to improve assembly efficiency. In addition, the cooling system 30 is used to cool the generator 20 and includes a drive mechanism 31 for driving the flow of coolant. The input shaft of the drive mechanism 31 is coaxial with the transmission shaft 23, so that the generator 20 can be fully cooled, thereby preventing damage to the generator 20, which is beneficial to improving the power density of the generator 20 and ensuring the normal operation of the range extender system 100. It can also make the structure of the range extender system 100 compact and effectively utilize space, which is beneficial to improving space utilization.

[0041] In some embodiments of the present invention, the crankshaft 11 and the transmission shaft 23 are connected by fasteners, which can ensure a reliable connection between the crankshaft 11 and the transmission shaft 23, ensure the continuity and stability of power transmission, and facilitate maintenance and replacement of parts, thereby improving assembly efficiency. For example, the fasteners can be bolts.

[0042] According to some embodiments of the present invention, Figure 1 As shown, the end of the transmission shaft 23 away from the crankshaft 11 (eg Figure 1 The right end shown in the figure is connected to the input shaft, so that the transmission shaft 23 can directly drive the driving mechanism 31 to work, which can eliminate other power components, which is beneficial to reducing production costs and reducing occupied space. It can also eliminate the intermediate transmission structure between the transmission shaft 23 and the input shaft, avoiding energy loss, which is beneficial to improving the working efficiency of the cooling system 30.

[0043] In some embodiments, the transmission shaft 23 is connected to the input shaft through a spline, ensuring that the transmission shaft 23 is reliably connected to the input shaft, facilitating that the transmission shaft 23 directly drives the input shaft to rotate, thereby improving the stability and reliability of the transmission, and having a simple structure, which can reduce production costs and improve assembly efficiency.

[0044] In some embodiments of the present invention, Figure 1As shown, the cooling system 30 also includes a spray pipe 32 located within the generator 20 and in communication with the drive mechanism 31. The spray pipe 32 is provided with a spray hole 321 located radially outward of the stator 21. Thus, the drive mechanism 31 can drive the coolant to flow into the spray pipe 32, directing the coolant to the rotor 22 and stator 21. The coolant is then sprayed toward the outside of the stator 21 through the spray holes 321, cooling the outer ring of the stator 21 winding and the rotor 22. This effectively reduces the operating temperature of the stator 21 and rotor 22, preventing performance degradation or damage caused by overheating and ensuring the normal operation of the generator 20.

[0045] According to some embodiments of the present invention, Figure 1 As shown, there are multiple spray holes 321, and the multiple spray holes 321 are arranged along the length direction of the spray pipe 32 (for example Figure 1 The stator 21 and the rotor 22 are spaced apart (in the left and right directions shown in the figure), and the flow rate of the coolant sprayed toward the stator 21 can be increased through the multiple spray holes 321, ensuring reliable cooling of the stator 21, and at least some of the spray holes 321 are located at both ends of the axial direction of the stator 21, so that the coolant can be sprayed on both ends of the axial direction of the stator 21 and the rotor 22 through the spray holes 321, so that the stator 21 and the rotor 22 are cooled more evenly, local overheating is prevented, and the cooling efficiency is improved.

[0046] In the embodiment of the present invention, the number of the spray holes 321 can be flexibly set according to actual conditions. For example, the spray holes 321 can be as follows: Figure 1 Two are shown, but there may be three, four, five, six or more, all of which are within the scope of protection of the present invention.

[0047] In some embodiments of the present invention, Figure 1 As shown, the transmission shaft 23 has an oil supply channel and a spray hole 231. The spray hole 231 is connected to the oil supply channel, and the drive mechanism 31 is connected to the oil supply channel. The drive mechanism 31 can drive coolant into the oil supply channel. When the transmission shaft 23 rotates, the coolant in the oil supply channel exerts centrifugal force, causing the coolant to be quickly ejected from the spray hole 231. The large amount of liquid sprayed can cool the inner ring of the stator 21 winding and the rotor 22, ensuring effective cooling of the stator 21 and rotor 22.

[0048] In some embodiments, there are multiple spray holes 231, and the multiple spray holes 231 are arranged along the length direction of the transmission shaft 23 (for example, Figure 1The stator 21 and the rotor 22 are spaced apart (in the left and right directions shown in the figure), and the flow rate of the coolant sprayed toward the stator 21 and the rotor 22 can be increased through the multiple spray holes 231, ensuring reliable cooling of the stator 21 and the rotor 22, and at least some of the spray holes 231 are located at both ends of the axial direction of the stator 21, so that the coolant can be sprayed on both ends of the axial direction of the stator 21 and the rotor 22 through the spray holes 321, so that the stator 21 and the rotor 22 are cooled more evenly, local overheating is prevented, and the cooling efficiency is improved.

[0049] In the embodiment of the present invention, the number of the spray holes 231 can be flexibly set according to actual conditions. For example, the spray holes 231 can be as follows: Figure 1 Two are shown, but there may be three, four, five, six or more, all of which are within the scope of protection of the present invention.

[0050] In some specific embodiments, Figure 1 As shown, a spray pipe 32 is located within the generator 20 and communicates with the drive mechanism 31. Spray holes 321 are provided on the spray pipe 32, located radially outward from the stator 21. The drive shaft 23 has an oil supply channel and a spray hole 231 connected to the oil supply channel. The drive mechanism 31 is also connected to the oil supply channel. Thus, spray holes 321 and 231 can cool the outer and inner rings of the windings, respectively. This can meet the cooling requirements of, for example, an 8-layer or 10-layer winding, providing more efficient cooling.

[0051] According to some embodiments of the present invention, Figure 1 As shown, the generator 20 is also provided with an oil collector 24, located below the stator 21. This oil collector 24 collects the coolant within the generator 20, preventing it from dispersing and causing contamination or impacting the performance of the generator 20. Furthermore, the oil collector 24 is connected to the drive mechanism 31, allowing the drive mechanism 31 to drive the coolant within the oil collector 24, eliminating the need for external coolant supply, ensuring a compact structure, and reducing the space occupied by the range extender system 100.

[0052] In some embodiments of the present invention, Figure 1 As shown, the generator 20 further includes a first housing 25, within which the rotor 22 and stator 21 are both disposed. The first housing 25 protects the rotor 22 and stator 21, preventing them from being exposed and potentially damaged, thereby extending the service life of the generator 20. Furthermore, the stator 21 and the first housing 25 may be fitted with an interference fit, or they may be connected with fasteners, both of which secure the stator 21 and ensure reliable fixation, thereby ensuring proper operation of the generator 20. For example, the fasteners may be eye bolts, etc.

[0053] In some embodiments where the cooling system 30 also includes a spray pipe 32, the spray pipe 32 can be arranged in the shell, which can achieve the fixation of the spray pipe 32, meet the fixation requirements of the spray pipe 32, and reduce the occupied space, ensure a compact structure, and avoid interference between the spray pipe 32 and other structures.

[0054] According to some embodiments of the present invention, Figure 1 As shown, the first housing 25 is provided with a relief hole 251, through which the drive shaft 23 passes. This facilitates connection between the drive shaft 23 and the crankshaft 11, ensuring unimpeded power transmission between the drive shaft 23 and the crankshaft 11. Furthermore, a seal 26 is provided between the outer wall of the drive shaft 23 and the wall of the relief hole 251. This seal 26 seals the first housing 25, preventing coolant from escaping through the gap between the outer wall of the drive shaft 23 and the wall of the relief hole 251, ensuring safety. It also maintains the cleanliness and dryness of the interior of the generator 20, preventing impurities from entering the generator 20 through the gap between the outer wall of the drive shaft 23 and the wall of the relief hole 251 and potentially affecting its operation, thereby ensuring proper operation of the generator 20. For example, the seal 26 may be an oil seal.

[0055] In some embodiments, as Figure 1 As shown, the engine 10 also includes a second housing 12, and the crankshaft 11 passes through the second housing 12, which facilitates the connection between the crankshaft 11 and the transmission shaft 23, meeting the connection requirements of the transmission shaft 23 and the crankshaft 11. The second housing 12 can protect the internal structure of the engine 10 to prevent the internal structure from being exposed and damaged, which is beneficial to extending the service life of the engine 10. In addition, the second housing 12 and the end of the transmission shaft 23 extending from the first housing 25 (for example Figure 1 The left end shown in the figure is connected to realize the connection between the engine 10 and the generator 20, ensuring a compact structure and reducing the occupied space of the range extender system 100.

[0056] In some embodiments of the present invention, the driving mechanism 31 is a mechanical oil pump, so that the generator 20 can be cooled by oil cooling, which has a better cooling effect than water cooling, can further improve the power density of the generator 20, and can reduce the volume and production cost of the generator 20. At the same time, compared with the electronic oil pump, it can reduce the production cost while meeting the reasonable design flow distribution requirements.

[0057] A vehicle according to an embodiment of the present invention includes a range extender system 100 according to an embodiment of the present invention. Because the range extender system 100 according to an embodiment of the present invention has the aforementioned beneficial technical effects, the vehicle according to the embodiment of the present invention has a rotor 22 sleeved on and connected to a drive shaft 23, the rotor 22 rotatably disposed within a stator 21, and one axial end of the crankshaft 11 is fixedly connected to the drive shaft 23 to drive the generator 20 for generating electricity. While balancing the unevenness of the engine 10 during operation and absorbing impact loads, the flywheel torque reducer located at the end of the engine in related art is eliminated, and the axial length of the engine 10 and the generator 20 is reduced, ensuring a compact structure of the range extender system 100 while avoiding NVH issues caused by high-speed rotation. This improves the overall power density and efficiency of the range extender, reduces the volume and production cost of the range extender system 100, and facilitates improved assembly efficiency. In addition, the cooling system 30 is used to cool the generator 20 and includes a drive mechanism 31 for driving the flow of coolant. The input shaft of the drive mechanism 31 is coaxial with the transmission shaft 23, so that the generator 20 can be fully cooled, thereby preventing damage to the generator 20, which is beneficial to improving the power density of the generator 20 and ensuring the normal operation of the range extender system 100. It can also make the structure of the range extender system 100 compact and effectively utilize space, which is beneficial to improving space utilization.

[0058] In some embodiments, the range extender system 100 is applied to a vehicle, which can solve the range anxiety problem of pure electric vehicles and retain the driving experience of pure electric vehicles, which is conducive to improving the user experience.

[0059] In some embodiments, the range extender system 100 further includes a controller that rectifies the AC power generated by the generator 20 into DC power and supplies the DC power to a demand-side source. For example, the DC power can be supplied to the vehicle's battery to charge and store energy, similar to a "power bank" function. Alternatively, the DC power can be directly supplied to the vehicle's drive motor as energy, activating the drive motor and enabling the vehicle to travel.

[0060] Other components and operations of the range extender system 100 and the vehicle according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0061] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0062] Throughout this specification, reference to terms such as "embodiment," "specific embodiment," and "example" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0063] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A range extender system, characterized in that: include: an engine having a crankshaft; A generator, the generator comprising a stator, a rotor, and a transmission shaft, the rotor being sleeved on and connected to the transmission shaft, the rotor being rotatably disposed within the stator, and one axial end of the crankshaft being fixedly connected to the transmission shaft to drive the generator to generate electricity; A cooling system is used to cool the generator and includes a drive mechanism for driving the flow of coolant. The input shaft of the drive mechanism is coaxial with the transmission shaft. The transmission shaft has an oil supply channel and a spray hole connected to the oil supply channel. The drive mechanism is connected to the oil supply channel, and the end of the transmission shaft away from the crankshaft is connected to the input shaft.

2. The range extender system according to claim 1, characterized in that: The crankshaft and the transmission shaft are connected by fasteners.

3. The range extender system according to claim 1, characterized in that: The cooling system further comprises: A spray pipe is located in the generator and is connected to the driving mechanism. The spray pipe is provided with a spray hole, and the spray hole is located radially outside the stator.

4. The range extender system according to claim 3, characterized in that: The spray holes are multiple and spaced apart along the length direction of the spray pipe, and at least some of the spray holes are located at both ends of the stator in the axial direction.

5. The range extender system according to claim 3 or 4, characterized in that: An oil collector for collecting oil is also provided in the generator. The oil collector is located below the stator and is communicated with the driving mechanism.

6. The range extender system according to claim 1, characterized in that: The generator further comprises: A first housing, wherein the rotor and the stator are both arranged in the first housing, and the stator is connected to the first housing by interference fit or by fasteners.

7. The range extender system according to claim 6, characterized in that: The first housing is provided with a relief hole, the transmission shaft is passed through the relief hole to be connected with the crankshaft, and a sealing member is provided between the outer peripheral wall of the transmission shaft and the hole wall of the relief hole.

8. The range extender system according to claim 1, characterized in that: The driving mechanism is a mechanical oil pump.

9. A vehicle, characterized in that: The invention comprises a range extender system according to any one of claims 1 to 8.

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