Range extender system

Abstract

The utility model provides a kind of range extender system.The range extender system includes: engine, including engine body, flywheel, flywheel shell and pivot, flywheel shell cover is set in flywheel outside;Generator, including casing, stator part, rotor part and support, stator part is fixed in casing, rotor part is set on support, to rotate with support relative to stator part;Wherein, casing is connected with engine body by flywheel shell, support is connected with pivot by flywheel.The utility model effectively solves the problem that the mode that engine and generator are connected by coupling in prior art not only influences the operation reliability of range extender system, but also leads to the problem that the volume and weight of range extender system are relatively large.

Description

Technical Field

[0001] This utility model relates to the field of automotive powertrain technology, and more specifically, to a range extender system. Background Technology

[0002] Currently, in existing range extender systems, the engine and generator are usually separate components, connected by a coupling or other similar mechanical structure to transfer the mechanical energy generated by the engine to the generator, which then converts it into electrical energy for use in the series hybrid system.

[0003] However, while the aforementioned connection method between the engine and generator simplifies their manufacturing and maintenance to some extent, the difference in control precision and response rate between the two during operation means that the coupling is subjected to frequent alternating load impacts when the range extender system's power generation changes or adjusts rapidly. In this situation, the coupling, as the sole medium connecting the two, endures uneven mechanical stress over a long period, making it prone to fatigue damage and even fracture failure, severely impacting the reliability and service life of the range extender. Furthermore, the presence of the coupling increases the axial length of the system, making the overall layout less compact and also increasing the weight and cost of the equipment to some extent. Utility Model Content

[0004] The main objective of this invention is to provide a range extender system that solves the problem that the existing method of connecting the engine and generator via a coupling not only affects the operational reliability of the range extender system but also results in a large size and weight of the range extender system.

[0005] To achieve the above objectives, this utility model provides a range extender system, comprising: an engine, including an engine body, a flywheel, a flywheel housing, and a rotating shaft, the flywheel housing covering the flywheel; and a generator, including a housing, a stator, a rotor, and a bracket, the stator being fixed inside the housing, and the rotor being mounted on the bracket to rotate relative to the stator with the bracket; wherein the housing is connected to the engine body via the flywheel housing, and the bracket is connected to the rotating shaft via the flywheel.

[0006] Furthermore, the housing and flywheel housing are connected by fasteners, snap-fit, adhesive, or riveting. The range extender system also includes a mating component, which includes: a first mating part disposed on the housing; and a second mating part disposed on the flywheel housing. One of the first and second mating parts is a protrusion, and the other is a recess. The protrusion extends into the recess to engage with the recess for limiting and matching, thereby achieving circumferential positioning between the housing and the flywheel housing.

[0007] Furthermore, one end of the housing is connected to the flywheel housing, and one end of the bracket is connected to the flywheel. The generator also includes: an end cover connected to the other end of the housing, the end cover having a mounting hole; a bearing structure disposed in the mounting hole, the outer ring of the bearing structure being connected to the wall of the mounting hole; and a rotating structure including a rotating part and a first shaft connected to each other, the rotating part being connected to the other end of the bracket, and at least a portion of the first shaft extending into and connected to the inner ring of the bearing structure.

[0008] Furthermore, the generator also includes: a first detection device disposed on the rotating structure for detecting the rotation angle and / or rotational speed of the rotating structure; wherein the end cover also has a receiving recess communicating with the mounting hole, and the first detection device is located in the receiving recess.

[0009] Furthermore, the housing is manufactured using a stamping and stretching process; and / or, the housing has cooling channels that extend along the axial direction and / or circumferential direction of the housing.

[0010] Furthermore, the engine also includes: a second detection device, which is disposed on the flywheel housing to detect the rotation angle and / or speed of the engine; wherein, the generator also includes: a magnetic blocking structure, which is disposed inside the housing and has a blocking part, the magnetic blocking structure being located between the stator and the second detection device; along the axial direction of the housing, the orthographic projection of the stator on the blocking part is located inside the blocking part.

[0011] Furthermore, the blocking part is plate-shaped; and / or, the blocking part is a ring-shaped structure or an arc-shaped structure.

[0012] Furthermore, the support is cylindrical, and a stop is provided on the outer surface of the support. The generator also includes two rotor pressure plates, which are located on both sides of the rotor part along the axial direction of the support to axially limit the rotor part; one rotor pressure plate is stopped by the stop, and the other rotor pressure plate is stopped by the end of the support.

[0013] Furthermore, the flywheel and the support are separate structures; or, the flywheel and the support are integrally molded structures.

[0014] Furthermore, one end of the housing is connected to the flywheel housing, and the flywheel and the bracket are integrally formed; the generator also includes: an end cover, which is connected to the other end of the housing, and the end cover has a mounting hole; a bearing structure, which is set in the mounting hole, and the outer ring of the bearing structure is connected to the hole wall of the mounting hole; a second shaft, one end of which is connected to the flywheel, and the other end of which extends into the inner ring of the bearing structure and is connected to the inner ring.

[0015] By applying the technical solution of this utility model, since the engine flywheel and the generator rotor are directly connected through a bracket and shaft, the coupling structure in the traditional range extender system is eliminated. This not only reduces energy loss during power transmission and improves the overall energy conversion efficiency of the system, but also reduces potential failure points and lowers the probability of range extender system failure. In particular, it avoids fatigue damage of the coupling under high-frequency alternating loads, thereby enhancing the long-term operational reliability of the range extender system. Simultaneously, by directly connecting the flywheel housing and the engine housing, and rigidly connecting the bracket to the flywheel, the coaxiality between the generator rotor and the engine shaft can be more precisely controlled, thereby reducing vibration and noise during rotation and improving system stability. Thus, the above design of the range extender system eliminates the reliability risks of the coupling while improving the integration of the range extender system, reducing the overall axial dimensions, weight, and cost. This solves the problem that the existing technology, which connects the engine and generator through a coupling, not only affects the operational reliability of the range extender system but also results in a large size and weight. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0017] Figure 1 A cross-sectional view of a first embodiment of the range extender system according to the present invention is shown;

[0018] Figure 2 A cross-sectional view of the flywheel, bracket, and second shaft of a second embodiment of the range extender system according to the present invention is shown.

[0019] The above figures include the following reference numerals:

[0020] 10. Engine; 11. Engine body; 12. Flywheel; 13. Flywheel housing; 14. Shaft; 15. Second detection device;

[0021] 20. Generator; 21. Housing; 211. Cooling channel; 22. Stator; 23. Rotor; 24. Bracket; 241. Stop; 25. End cover; 251. Mounting hole; 252. Receiving recess; 26. Bearing structure; 27. Rotating structure; 271. Rotating part; 272. First shaft; 28. First detection device; 29. ​​Magnetic blocking structure; 291. Blocking part; 210. Rotor pressure plate; 220. Second shaft; 230. Gear ring;

[0022] 30. Junction box. Detailed Implementation

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0025] In this utility model, unless otherwise stated, directional terms such as "upper" and "lower" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" are generally used in relation to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0026] To address the problem that the existing technology of connecting the engine and generator via a coupling not only affects the operational reliability of the range extender system but also results in a large size and weight of the range extender system, this application provides a range extender system.

[0027] like Figure 1 As shown, the range extender system includes an engine 10 and a generator 20. The engine 10 includes an engine body 11, a flywheel 12, a flywheel housing 13, and a shaft 14, with the flywheel housing 13 covering the flywheel 12. The generator 20 includes a housing 21, a stator 22, a rotor 23, and a bracket 24. The stator 22 is fixed inside the housing 21, and the rotor 23 is mounted on the bracket 24 to rotate relative to the stator 22 with the bracket 24. The housing 21 is connected to the engine body 11 via the flywheel housing 13, and the bracket 24 is connected to the shaft 14 via the flywheel 12.

[0028] By applying the technical solution of this embodiment, since the flywheel 12 of the engine and the rotor 23 of the generator are directly connected through the bracket 24 and the shaft 14, the coupling structure in the traditional range extender system is eliminated. This not only reduces energy loss during power transmission and improves the overall energy conversion efficiency of the system, but also reduces potential failure points and lowers the probability of range extender system failure. In particular, it avoids fatigue damage of the coupling under high-frequency alternating loads, thereby enhancing the long-term operational reliability of the range extender system. At the same time, by directly connecting the flywheel housing 13 and the housing 21 and rigidly connecting the bracket 24 to the flywheel 12, the coaxiality between the rotor 23 of the generator 20 and the shaft 14 of the engine 10 can be more precisely controlled, thereby reducing vibration and noise during rotation and improving system stability. In this way, the above design of the range extender system eliminates the reliability risk of the coupling, improves the integration of the range extender system, reduces the axial size, weight, and cost of the whole machine, and solves the problem that the existing method of connecting the engine and generator through a coupling not only affects the operational reliability of the range extender system but also results in a large size and weight of the range extender system.

[0029] Optionally, the housing 21 and the flywheel housing 13 can be connected by fasteners, snap-fit, adhesive, or riveting. This arrangement makes the connection between the housing 21 and the flywheel housing 13 more flexible, meeting different usage requirements and working conditions, and also improving the processing flexibility of the workers.

[0030] In this embodiment, the housing 21 and the flywheel housing 13 are connected by fasteners, thereby reducing the assembly difficulty while ensuring the connection strength between the two.

[0031] Alternatively, the fastener may be a bolt or a screw.

[0032] Optionally, the range extender system also includes a mating assembly, comprising a first mating part and a second mating part. The first mating part is disposed on the housing 21, and the second mating part is disposed on the flywheel housing 13. One of the first and second mating parts is a protrusion, and the other is a recess. The protrusion extends into the recess to engage with it, thereby achieving circumferential positioning between the housing 21 and the flywheel housing 13. This design, where the protrusion extends into the recess to maintain a limiting fit, precisely controls the relative positional relationship between the housing 21 and the flywheel housing 13 in the circumferential direction, ensuring synchronous rotation and improving coaxiality. This avoids eccentricity during rotation and improves the stability and efficiency of system operation. Furthermore, during system maintenance or component replacement, the aforementioned design of the mating assembly serves as an assembly positioning feature, allowing personnel to quickly identify the correct positional relationship for easy realignment and tightening, ensuring that the system maintains high-precision coaxiality after maintenance.

[0033] In this embodiment, the first mating part is a protrusion and the second mating part is a recess. The protrusion extends into the recess to engage with the recess for limiting, so as to achieve circumferential positioning between the housing 21 and the flywheel housing 13, and to achieve coaxial positioning of the housing 21 and the flywheel housing 13.

[0034] In other embodiments not shown in the accompanying drawings, the first mating part is a recess and the second mating part is a protrusion. The protrusion extends into the recess to limit the mating with the recess, so as to achieve circumferential positioning between the housing 21 and the flywheel housing 13, and to achieve coaxial positioning of the housing 21 and the flywheel housing 13.

[0035] like Figure 1 As shown, one end of the housing 21 is connected to the flywheel housing 13, and one end of the bracket 24 is connected to the flywheel 12. The generator 20 also includes an end cover 25, a bearing structure 26, and a rotating structure 27. The end cover 25 is connected to the other end of the housing 21 and has a mounting hole 251. The bearing structure 26 is disposed within the mounting hole 251, and its outer ring is connected to the wall of the mounting hole 251. The rotating structure 27 includes a rotating part 271 and a first shaft 272 connected to each other. The rotating part 271 is connected to the other end of the bracket 24, and at least a portion of the first shaft 272 extends into and is connected to the inner ring of the bearing structure 26. Thus, the bearing structure 26 effectively supports the first shaft 272, providing stable axial and radial support, ensuring the dynamic balance of the rotor 23 of the generator 20 during high-speed rotation, reducing shaft vibration and noise, and thereby improving the overall efficiency and comfort of the system. Meanwhile, the fixed connection between the housing 21 and the flywheel housing 13, as well as the direct linkage between the bracket 24 and the flywheel 12, make the structure of the entire range extender system more stable and increase the system's ability to resist external impacts.

[0036] In this embodiment, the mounting hole 251 of the end cover 25 is designed as the mounting position for the bearing structure 26, which facilitates the disassembly, assembly, and maintenance of the bearing structure 26. When it is necessary to replace the bearing structure 26 or perform an inspection, the operation can be performed directly from the end cover 25 without disassembling more components, greatly simplifying the maintenance process and shortening downtime. At the same time, the first shaft 272 of the rotating structure 27 is precisely fitted with the inner ring of the bearing structure 26, ensuring accurate alignment between the rotor section 23 and the stator section 22, avoiding efficiency loss and safety hazards caused by assembly deviations.

[0037] Specifically, the outer ring of the bearing structure 26 is fixedly connected to the wall of the mounting hole 251, and the inner ring of the bearing structure 26 is fixedly connected to the first shaft 272. The two ends of the bracket 24 are respectively connected to the flywheel 12 and the rotating structure 27 to provide stable support for the rotor section 23, ensuring the normal operation of the generator 20. The bearing structure 26 supports the weight of the entire rotor section 23, preventing excessive radial displacement of the shaft system during rotation when the rotor is cantilevered, which could affect the operational reliability of the generator 20.

[0038] like Figure 1 As shown, the generator 20 also includes a first detection device 28, which is disposed on the rotating structure 27 for detecting the rotation angle and / or speed of the rotating structure 27. The end cover 25 also has a receiving recess 252 communicating with the mounting hole 251, and the first detection device 28 is located within the receiving recess 252. In this way, the first detection device 28 is directly mounted on the rotating structure 27, enabling more accurate detection of the rotation angle and speed of the rotor 23, thus improving the overall control accuracy of the system. Simultaneously, placing the first detection device 28 within the receiving recess 252 in the end cover 25 fully utilizes the internal space of the generator 20, avoiding additional external mounting locations, which helps to reduce the overall size of the generator, making it more compact.

[0039] Optionally, the first detection device 28 is a rotary transformer.

[0040] Optionally, the housing 21 is manufactured using a stamping and stretching process; and / or, the housing 21 has cooling channels 211 extending along the axial direction and / or circumferentially of the housing 21. In this way, the stamping and stretching process can produce a housing 21 with uniform wall thickness and high structural strength, giving it better resistance to deformation and enabling it to withstand the vibrations and power loads generated during engine operation, thus improving the structural stability and durability of the entire range extender system. Simultaneously, the design of the cooling channels 211 effectively guides the coolant (such as water or oil) through the interior of the housing 21, carrying away the heat generated during the operation of the stator 22. The cooling channels 211 extending along the axial direction and / or circumferentially ensure uniform coolant distribution, improve cooling efficiency, prevent localized overheating, and guarantee the long-term stable operation of the generator 20.

[0041] In this embodiment, the housing 21 is manufactured using a stamping and stretching process. The housing 21 has a cooling channel 211 that extends along the axial direction of the housing 21 to remove the heat generated by the stator 22 during operation through water cooling, thereby preventing the generator 20 from failing due to overheating.

[0042] like Figure 1As shown, the engine also includes a second detection device 15, which is mounted on the flywheel housing 13 to detect the engine's rotation angle and / or speed. The generator 20 also includes a magnetic shielding structure 29, which is disposed within the housing 21 and has a blocking portion 291. The magnetic shielding structure 29 is located between the stator portion 22 and the second detection device 15; along the axial direction of the housing 21, the orthographic projection of the stator portion 22 onto the blocking portion 291 is located within the blocking portion 291. Thus, the second detection device 15 can accurately detect the rotation angle and speed of the engine 10, providing real-time feedback data to the engine 10's controller, which helps to achieve precise control and optimization of the engine 10, improving its working efficiency and fuel economy. Simultaneously, the aforementioned mounting position of the magnetic shielding structure 29 effectively shields the second detection device 15 from interference from the magnetic field generated by the stator portion 22, ensuring that the accuracy of speed and angle detection is not affected by fluctuations in the generator's magnetic field, thereby guaranteeing the detection accuracy of the second detection device 15.

[0043] In this embodiment, the magnetic shielding structure 29 avoids detection errors caused by magnetic field interference, reduces the failure rate of the system due to sensor false alarms, and improves the overall system's operational reliability and stability.

[0044] Optionally, the second detection device 15 is a speed sensor, which reads the speed signal of the engine 10. In this way, the above-mentioned arrangement of the magnetic shielding structure 29 avoids interference from the high-voltage magnetic field of the stator section 22 on the speed sensor signal.

[0045] Optionally, the blocking part 291 is plate-shaped; and / or, the blocking part 291 is an annular or arc-shaped structure. In this way, the plate-shaped blocking part 291 reduces the processing cost and difficulty of the magnetic blocking structure 29, thereby reducing the overall processing cost of the range extender system. At the same time, the annular or arc-shaped blocking part 291 can effectively block magnetic fields in all directions, maintaining good electromagnetic isolation even in complex mechanical structures, and also fits more closely to the internal contour of the housing 21, achieving a compact spatial layout. Furthermore, the above-mentioned configuration allows for more flexible selection of the shape of the blocking part 291 to meet different usage requirements and operating conditions, and also improves the processing flexibility of the operators.

[0046] In this embodiment, the blocking part 291 is plate-shaped. The blocking part 291 has a ring structure, thereby ensuring that the magnetic blocking structure 29 can block the magnetic field generated by the stator part 22 in all directions in the circumferential direction.

[0047] like Figure 1As shown, the support 24 is cylindrical, and a stop 241 is provided on the outer surface of the support 24. The generator 20 also includes two rotor pressure plates 210. Along the axial direction of the support 24, the two rotor pressure plates 210 are located on both sides of the rotor section 23 to axially limit the rotor section 23. One rotor pressure plate 210 is stopped by the stop 241, and the other rotor pressure plate 210 is stopped by the end of the support 24. In this way, the two rotor pressure plates 210 are located on both sides of the rotor section 23. Through the stop 241 and the end stop of the support 24, the position of the rotor section 23 in the axial direction can be precisely controlled, avoiding uneven stator-rotor clearance caused by axial movement of the rotor, and improving the operating efficiency and stability of the generator 20.

[0048] In this embodiment, the cylindrical support 24 provides stable support for the rotor 23. Especially under high-speed rotation, the cooperation between the stop 241 and the rotor pressure plate 210 can effectively limit the axial vibration of the rotor 23, reduce mechanical wear, and extend its service life.

[0049] Optionally, the flywheel 12 and the bracket 24 are separate structures; or, the flywheel 12 and the bracket 24 are integrally formed structures. This arrangement allows for a more flexible connection between the flywheel 12 and the bracket 24, meeting different usage requirements and working conditions, and also improving the processing flexibility for workers.

[0050] In this embodiment, the flywheel 12 and the bracket 24 are separate structures, and the two are connected by fasteners.

[0051] like Figure 1 As shown, the generator 20 also includes a junction box 30, which has an interface for connecting to the three-phase high-voltage line and for electrical connection with the controller of the generator 20.

[0052] like Figure 1 As shown, a gear ring 230 is provided on the flywheel 12 to enable the starting function of the engine 10.

[0053] Optionally, a signal disk is provided on the flywheel 12.

[0054] Example 2

[0055] The difference between the range extender system in Example 2 and Example 1 is that the structure of the generator 20 is different.

[0056] like Figure 2As shown, one end of the housing 21 is connected to the flywheel housing 13, and the flywheel 12 and the bracket 24 are integrally formed. The generator 20 also includes an end cover 25, a bearing structure 26, and a second shaft 220. The end cover 25 is connected to the other end of the housing 21 and has a mounting hole 251. The bearing structure 26 is disposed within the mounting hole 251, and its outer ring is connected to the wall of the mounting hole 251. One end of the second shaft 220 is connected to the flywheel 12, and the other end extends into and connects to the inner ring of the bearing structure 26. Thus, the integrally formed structure of the flywheel 12 and the bracket 24, and the direct connection between the housing 21 and the flywheel housing 13, significantly enhance the overall rigidity and stability of the system, reduce vibration and noise caused by loose or deformed connections between components, and improve the smoothness of generator operation. Meanwhile, the bearing structure 26 effectively supports the second shaft 220, providing stable axial and radial support, ensuring the dynamic balance of the rotor 23 of the generator 20 during high-speed rotation, reducing shaft vibration and noise, and thus improving the overall efficiency and comfort of the system. Furthermore, the fixed connection between the housing 21 and the flywheel housing 13, and the direct linkage between the bracket 24 and the flywheel 12, make the entire range extender system more robust, increasing its resistance to external impacts.

[0057] In this embodiment, the outer ring of the bearing structure 26 is fixedly connected to the wall of the mounting hole 251, and the inner ring of the bearing structure 26 is fixedly connected to the second shaft 220 to provide stable support for the rotor section 23 and ensure that the generator 20 can operate normally. The bearing structure 26 supports the weight of the entire rotor section 23, preventing excessive radial displacement of the shaft system during rotation when the rotor is cantilevered, which could affect the operational reliability of the generator 20.

[0058] In this embodiment, the flywheel 12, bracket 24, and second shaft 220 are integrally formed. This integral design reduces stress concentration and mechanical weaknesses caused by welding, fastening, or assembly, resulting in a higher overall strength and rigidity. This allows the flywheel 12, bracket 24, and second shaft 220 to better withstand the loads during high-speed rotation and power transmission, improving the system's stability and reliability. Furthermore, this design eliminates accumulated assembly tolerances between the flywheel 12 and bracket 24, and between bracket 24 and rotating structure 27, optimizing the coaxiality of the range extender system.

[0059] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0060] Because the engine flywheel and generator rotor are directly connected via a bracket and shaft, the coupling structure in traditional range extender systems is eliminated. This not only reduces energy loss during power transmission and improves the overall energy conversion efficiency of the system, but also reduces potential failure points and lowers the probability of range extender system failure. In particular, it avoids fatigue damage to the coupling under high-frequency alternating loads, thereby enhancing the long-term operational reliability of the range extender system. Simultaneously, by directly connecting the flywheel housing and the engine housing, and rigidly connecting the bracket to the flywheel, the coaxiality between the generator rotor and the engine shaft can be more precisely controlled, reducing vibration and noise during rotation and improving system stability. Thus, this design of the range extender system eliminates the reliability risks associated with couplings, while increasing the integration of the range extender system, reducing the overall axial dimensions, weight, and cost. This solves the problem that the existing technology, which uses couplings to connect the engine and generator, not only affects the operational reliability of the range extender system but also results in a large size and weight.

[0061] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0062] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0063] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0064] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A range extender system, characterized in that, include: The engine (10) includes an engine body (11), a flywheel (12), a flywheel housing (13), and a shaft (14), wherein the flywheel housing (13) covers the flywheel (12); The generator (20) includes a housing (21), a stator (22), a rotor (23), and a bracket (24). The stator (22) is fixed inside the housing (21), and the rotor (23) is mounted on the bracket (24) to rotate relative to the stator (22) with the bracket (24). The housing (21) is connected to the engine body (11) via the flywheel housing (13), and the bracket (24) is connected to the rotating shaft (14) via the flywheel (12).

2. The range extender system according to claim 1, characterized in that, The housing (21) and the flywheel housing (13) are connected by fasteners, snap-fit, adhesive, or riveting. The range extender system also includes mating components, which include: The first mating part is provided on the housing (21); The second mating part is provided on the flywheel housing (13); In this configuration, one of the first mating part and the second mating part is a protrusion, and the other of the first mating part and the second mating part is a recess. The protrusion extends into the recess to engage with the recess for limiting and fitting, thereby achieving circumferential positioning between the housing (21) and the flywheel housing (13).

3. The range extender system according to claim 1, characterized in that, One end of the housing (21) is connected to the flywheel housing (13), one end of the bracket (24) is connected to the flywheel (12), and the generator (20) further includes: An end cap (25) is connected to the other end of the housing (21), and the end cap (25) has a mounting hole (251); A bearing structure (26) is disposed in the mounting hole (251), and the outer ring of the bearing structure (26) is connected to the hole wall of the mounting hole (251); The rotating structure (27) includes a rotating part (271) and a first shaft (272) connected to each other. The rotating part (271) is connected to the other end of the bracket (24). At least a portion of the first shaft (272) extends into and is connected to the inner ring of the bearing structure (26).

4. The range extender system according to claim 3, characterized in that, The generator (20) also includes: A first detection device (28) is disposed on the rotating structure (27) for detecting the rotation angle and / or rotation speed of the rotating structure (27); The end cap (25) also has a receiving recess (252) communicating with the mounting hole (251), and the first detection device (28) is located in the receiving recess (252).

5. The range extender system according to claim 1, characterized in that, The housing (21) is made by a stamping and stretching process; and / or, the housing (21) has a cooling channel (211) that extends along the axial direction and / or circumferential direction of the housing (21).

6. The range extender system according to claim 1, characterized in that, The engine also includes: A second detection device (15) is disposed on the flywheel housing (13) to detect the rotation angle and / or speed of the engine; The generator (20) further includes: A magnetic blocking structure (29) is disposed inside the housing (21) and has a blocking part (291). The magnetic blocking structure (29) is located between the stator part (22) and the second detection device (15). Along the axial direction of the housing (21), the orthographic projection of the stator part (22) on the blocking part (291) is located inside the blocking part (291).

7. The range extender system according to claim 6, characterized in that, The blocking part (291) is plate-shaped; and / or the blocking part (291) is an annular structure or an arc-shaped structure.

8. The range extender system according to claim 1, characterized in that, The bracket (24) is cylindrical, and a stop (241) is provided on the outer surface of the bracket (24). The generator (20) also includes: Two rotor pressure plates (210) are located on both sides of the rotor part (23) along the axial direction of the bracket (24) to axially limit the rotor part (23); One of the rotor pressure plates (210) is stopped by the stop portion (241), and the other rotor pressure plate (210) is stopped by the end of the bracket (24).

9. The range extender system according to claim 1, characterized in that, The flywheel (12) and the bracket (24) are separate structures; or the flywheel (12) and the bracket (24) are integrally formed structures.

10. The range extender system according to claim 9, characterized in that, One end of the housing (21) is connected to the flywheel housing (13), and the flywheel (12) and the bracket (24) are integrally formed; the generator (20) also includes: An end cap (25) is connected to the other end of the housing (21), and the end cap (25) has a mounting hole (251); A bearing structure (26) is disposed in the mounting hole (251), and the outer ring of the bearing structure (26) is connected to the hole wall of the mounting hole (251); The second shaft (220) has one end connected to the flywheel (12) and the other end extending into and connected to the inner ring of the bearing structure (26).

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