Range extender assembly

Abstract

The utility model discloses a range extender assembly, which relates to the technical field of power assemblies of hybrid electric vehicles and comprises an engine and a motor. The engine comprises a cylinder body and a crankshaft rotationally arranged in the cylinder body. The crankshaft is provided with an extending section extending out of the cylinder body. The motor comprises a machine shell, a stator, a rotor, a rotating shaft and a connecting rotating hub, the machine shell is arranged on the cylinder body and covers the outer side of the extending section, the stator, the rotor and the rotating shaft are all arranged in the machine shell, the rotating shaft and the extending section are connected and coaxially arranged, and an annular protrusion is arranged at the end, close to the rotating shaft, of the extending section or the end, close to the extending section, of the rotating shaft in the circumferential direction in a protruding mode. The connecting rotating hub sleeves the rotating shaft and is connected with the annular bulge; and the part, far away from the rotating shaft, of the connecting rotating hub is connected with the rotor. According to the range extender assembly, the crankshaft is directly connected with the rotating shaft, the rotor is connected with the annular protrusion through the connecting rotating hub, the integration degree of an engine and a motor is high, the number of parts is reduced, and therefore the size and cost after the engine and the motor are integrated are reduced.

Description

Technical Field

[0001] The present application relates to the technical field of powertrain of hybrid electric vehicles, and in particular to a range extender assembly. Background Art

[0002] In order to meet the requirements of national fuel consumption and emission regulations, new energy vehicles are developing rapidly, and the current market share of new energy vehicles has exceeded 30%. At present, new energy vehicles mainly include pure electric vehicles and hybrid vehicles. Since hybrid vehicles have the advantages of energy saving, emission reduction and long driving range, from the growth trend of new energy vehicles, the growth of pure electric vehicles has slowed down, while hybrid vehicles are still growing rapidly.

[0003] Most of the current hybrid vehicles simply mechanically connect the crankshaft of the engine and the rotating shaft of the motor through a dual-mass flywheel (DMF), and rely on the dual-mass flywheel to reduce the risk of speed fluctuations. However, this method results in a low integration of the engine and the motor, and a large number of parts, which makes the size of the integrated engine and motor large and the cost high. Utility Model Content

[0004] In view of the above, it is necessary to propose a range extender assembly to reduce the size and cost of the integrated engine and motor.

[0005] An embodiment of the present application provides a range extender assembly, comprising an engine and a motor; the engine comprises a cylinder body and a crankshaft rotatably disposed in the cylinder body, the crankshaft having an extension section extending out of the cylinder body; the motor comprises a casing, a stator, a rotor, a rotating shaft and a connecting hub, the casing being disposed in the cylinder body and covering the outside of the extension section, the stator, the rotor and the rotating shaft being all disposed in the casing, and the rotating shaft being connected to the extension section and coaxially arranged, an annular protrusion being circumferentially protruding from one end of the extension section close to the rotating shaft or one end of the rotating shaft close to the extension section, the connecting hub being sleeved on the rotating shaft and connected to the annular protrusion, and a portion of the connecting hub away from the rotating shaft being connected to the rotor.

[0006] The range extender assembly of the embodiment of the present application achieves a high degree of integration between the engine and the motor by directly assembling the motor to the cylinder block of the engine, directly connecting the crankshaft to the rotating shaft, and providing a connecting hub to connect the rotor to the annular protrusion convexly provided on the crankshaft or the rotating shaft, and eliminates the dual-mass flywheel structure, reducing the number of parts, thereby reducing the size and cost of the engine and motor after integration. In addition, since the connecting hub and the rotor can provide damping when the crankshaft and the rotating shaft rotate, it can effectively suppress large speed fluctuations when the crankshaft and the rotating shaft rotate, thereby improving the stability of the crankshaft and the rotating shaft in power output.

[0007] In some embodiments, the crankshaft and the rotating shaft are an integral structure.

[0008] In this way, by arranging the crankshaft and the rotating shaft as an integrated structure, it is beneficial to improve the structural strength and coaxiality of the crankshaft and the rotating shaft after they are connected.

[0009] In some embodiments, the annular protrusion is a flange structure, and the connecting hub has a flange plate corresponding to the annular protrusion, and the flange plate is detachably connected to the annular protrusion.

[0010] This is conducive to improving the convenience of connecting the connecting hub and the annular protrusion, and improving the connection strength between the connecting hub and the annular protrusion.

[0011] In some embodiments, a slot extending axially along the connecting hub is provided on the circumferential side of the connecting hub, and the slot is used to engage with the rotor. A stop ring is provided on the circumferential side of the connecting hub protruding outward along the circumference of the connecting hub, and the stop ring intersects with the slot. The stop ring is used to stop the rotor to limit the position of the rotor relative to the connecting hub.

[0012] In this way, by setting a slot to engage with the rotor and setting a stop cam to stop and limit the rotor, while improving the convenience and accuracy of connecting the rotor and the connecting hub, the slot can also limit the circumferential movement of the connecting hub relative to the rotor, and the stop cam can also limit the axial relative movement of the connecting hub and the rotor, thereby improving the accuracy and stability of the connecting hub driving the crankshaft and the rotating shaft to rotate under the drive of the rotor.

[0013] In some embodiments, the rotating shaft has a connecting portion at one end away from the extending section, and the connecting portion is used to connect to an external driving device so that the rotating shaft and the crankshaft can rotate and perform zero position calibration under the drive of the external driving device.

[0014] In this way, by providing a connecting portion at the end of the rotating shaft away from the extending section, it is helpful to improve the convenience of connecting the rotating shaft to the external driving device and performing zero position calibration.

[0015] In some embodiments, the motor further includes a bearing, wherein the bearing is sleeved on an end of the rotating shaft away from the extending section and connected to the housing.

[0016] In this way, by setting bearings, the vibration of the rotating shaft, crankshaft and rotor during rotation can be reduced, the disturbance of the crankshaft and the stability of the power output of the rotating shaft and crankshaft can be improved, and the vibration generated when the engine and motor are running can be reduced.

[0017] In some embodiments, the casing includes a shell and an end cover, the shell is arranged on the cylinder body, the shell is provided with a receiving hole that passes through a side of the shell close to the cylinder body and a side of the shell away from the cylinder body, the stator, the rotor and the rotating shaft are all arranged in the receiving hole, the stator is connected to the inner wall of the receiving hole, the extension section extends into the receiving hole, the end cover is arranged at one end of the shell away from the cylinder body, and the end cover closes the end of the receiving hole away from the cylinder body, a mounting hole connected to the receiving hole is opened in the middle of the end cover, and the bearing is arranged in the mounting hole.

[0018] In this way, by providing a receiving hole that passes through the side of the shell close to the cylinder body, the side of the shell facing the cylinder body is open, thereby reducing the weight of the range extender assembly; by providing an end cover to close the end of the receiving hole away from the cylinder body, it is convenient to install and repair the parts in the casing; by opening a mounting hole in the middle of the end cover that is connected to the receiving hole, it is convenient to install the bearing and facilitate the end of the rotating shaft away from the extension section to extend out of the casing.

[0019] In some embodiments, the housing further includes a closing piece, which is detachably disposed on a side of the end cover away from the receiving hole, and the closing piece closes the mounting hole.

[0020] In this way, by providing a sealing member to seal the mounting hole, liquid and dust can be effectively prevented from entering the casing and affecting the normal operation of the motor, and the noise generated when the motor is running can be effectively blocked from being transmitted to the outside of the casing.

[0021] In some embodiments, the cylinder has a first flange at one end facing the housing, and the housing has a second flange connected to the first flange at one end facing the cylinder.

[0022] In this way, the cylinder block and the housing are connected through the flange, thereby improving the convenience and firmness of connecting the engine and the motor.

[0023] In some embodiments, the range extender assembly also includes a controller, and the motor also includes a speed sensor, which is disposed in the housing and located on one side of the rotating shaft, and the speed sensor is electrically connected to the controller. The speed sensor is used to sense the speed of the rotating shaft so that the controller controls the loading or unloading of the motor.

[0024] In this way, by setting a speed sensor to sense the speed of the rotating shaft, and the controller controlling the loading or unloading of the motor according to the speed of the rotating shaft, the motor loading can be controlled when the engine load is high and positively excited, and the motor unloading can be controlled when the engine load is low and negatively excited, thereby realizing the active damping function, thereby optimizing the speed fluctuation of the crankshaft and the rotating shaft, and reducing the vibration generated by the range extender assembly during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the range extender assembly provided in an embodiment of the present application.

[0026] Figure 2 yes Figure 1 The cross-sectional view of the range extender assembly along the II-II direction is shown.

[0027] Figure 3 yes Figure 1 A schematic diagram of the three-dimensional structure of the connecting hub in the range extender assembly is shown.

[0028] Figure 4 yes Figure 1 Schematic diagram of the control architecture of the range extender assembly shown.

[0029] Figure 5 yes Figure 1 The crankshaft angle-torque curve diagram during the active vibration reduction process of the range extender assembly is shown.

[0030] Main component symbols

[0031] Range extender assembly 100

[0032] Engine 10

[0033] Cylinder 11

[0034] First flange 111

[0035] Crankshaft 12

[0036] Extension 121

[0037] Ring protrusion 1211

[0038] Motor 20

[0039] Case 21

[0040] Housing 211

[0041] Storage hole 2111

[0042] Second flange 2112

[0043] End cap 212

[0044] Mounting hole 2121

[0045] Closure 213

[0046] Stator 22

[0047] Rotor 23

[0048] Shaft 24

[0049] Connection part 241

[0050] Connecting hub 25

[0051] Flange 251

[0052] Card slot 252

[0053] Stop ring 253

[0054] Bearing 26

[0055] Speed ​​sensor 27

[0056] Controller 30

[0057] Engine controller 31

[0058] Motor controller 32 DETAILED DESCRIPTION

[0059] The embodiments of the present application are described in detail below, and 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 only used to explain the present application, and cannot be understood as limiting the present application.

[0060] In the description of the present application, it should be understood that the terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, it should be noted that the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0061] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication, it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. Some embodiments of the present application will be described in detail below in conjunction with the accompanying drawings.

[0062] See also Figure 1 and Figure 2 An embodiment of the present application provides a range extender assembly 100 , which is applied to a hybrid vehicle. The range extender assembly 100 includes an engine 10 and a motor 20 .

[0063] The engine 10 includes a cylinder block 11 and a crankshaft 12 rotatably disposed in the cylinder block 11 . The crankshaft 12 is rotated by a connecting rod (not shown) of the engine 10 . The crankshaft 12 has an extension section 121 extending out of the cylinder block 11 .

[0064] The motor 20 includes a casing 21, a stator 22, a rotor 23, a rotating shaft 24 and a connecting hub 25. The casing 21 is arranged on the cylinder body 11 and is covered on the outer side of the extension section 121. The stator 22, the rotor 23 and the rotating shaft 24 are all arranged in the casing 21. The stator 22 is connected to the inner wall of the casing 21. The rotating shaft 24 is connected to the extension section 121 and is coaxially arranged. An annular protrusion 1211 is circumferentially protruded at one end of the extension section 121 close to the rotating shaft 24. The connecting hub 25 is sleeved on the rotating shaft 24 and connected to the annular protrusion 1211. The part of the connecting hub 25 away from the rotating shaft 24 is connected to the rotor 23.

[0065] When the range extender assembly 100 needs to be driven by the engine 10, the connecting rod of the engine 10 drives the crankshaft 12 to rotate, and the crankshaft 12 and the rotating shaft 24 rotate at the same time to output power. When the range extender assembly 100 needs to be driven by the motor 20, the rotor 23 of the motor 20 rotates, and the rotor 23 drives the crankshaft 12 and the rotating shaft 24 to rotate at the same time to output power through the connecting hub 25. Since the range extender assembly 100 of the embodiment of the present application directly assembles the motor 20 to the cylinder body 11 of the engine 10, and directly connects the crankshaft 12 with the rotating shaft 24, and sets a connecting hub 25 to connect the rotor 23 with the annular protrusion 1211 protruding on the crankshaft 12, the integration of the engine 10 and the motor 20 is high, and the dual-mass flywheel structure is eliminated, the number of components is reduced, and the size and cost of the engine 10 and the motor 20 after integration are reduced. In addition, since the connecting hub 25 and the rotor 23 can provide damping when the crankshaft 12 and the rotating shaft 24 rotate, it can effectively suppress large speed fluctuations when the crankshaft 12 and the rotating shaft 24 rotate, thereby improving the stability of the power output of the crankshaft 12 and the rotating shaft 24.

[0066] In some other embodiments, the annular protrusion 1211 can also be protruded along the circumference of the rotating shaft 24 at one end of the rotating shaft 24 close to the extension section 121. After the rotating hub 25 is connected to the annular protrusion 1211, it can also drive the crankshaft 12 and the rotating shaft 24 to rotate simultaneously under the drive of the rotor 23. The embodiments of the present application do not make specific limitations on this.

[0067] In this embodiment, the crankshaft 12 and the rotating shaft 24 are an integral structure. Specifically, the crankshaft 12 and the rotating shaft 24 can be integrally formed by casting, cutting, etc. By setting the crankshaft 12 and the rotating shaft 24 as an integral structure, it is beneficial to improve the structural strength and coaxiality of the crankshaft 12 and the rotating shaft 24 after they are connected.

[0068] In some other embodiments, the crankshaft 12 and the rotating shaft 24 may also be connected by welding, bolting, etc., which is not specifically limited in the embodiments of the present application.

[0069] Please refer to Figure 3 In this embodiment, the annular protrusion 1211 is a flange structure, and the connecting hub 25 has a flange plate 251 corresponding to the annular protrusion 1211. The flange plate 251 and the annular protrusion 1211 are detachably connected by matching bolts (not shown). This is conducive to improving the convenience of connecting the connecting hub 25 and the annular protrusion 1211, and improving the connection strength of the connecting hub 25 and the annular protrusion 1211.

[0070] In this embodiment, a slot 252 extending along the axial direction of the connecting hub 25 is provided on the circumferential side of the connecting hub 25, and the slot 252 is used to engage with the rotor 23. A stop convex ring 253 is provided on the circumferential side of the connecting hub 25 to protrude outward along the circumferential direction of the connecting hub 25, and the stop convex ring 253 intersects with the slot 252. The stop convex ring 253 is used to stop the rotor 23 to limit the position of the rotor 23 relative to the connecting hub 25. By providing the slot 252 to engage with the rotor 23, and providing the stop convex ring 253 to stop and limit the rotor 23, while improving the convenience and accuracy of connecting the rotor 23 and the connecting hub 25, the slot 252 can also limit the movement of the connecting hub 25 relative to the rotor 23 in the circumferential direction, and the stop convex ring 253 can also limit the relative movement of the connecting hub 25 and the rotor 23 in the axial direction, thereby improving the accuracy and stability of the connecting hub 25 driving the crankshaft 12 and the rotating shaft 24 to rotate under the drive of the rotor 23.

[0071] In this embodiment, the rotor 23 is sleeved on the outer side of the connecting hub 25 and is interference fit with the connecting hub 25, the slot 252 extends from one end of the connecting hub 25 to the other end, and the stop convex ring 253 is provided at one end of the connecting hub 25 close to the engine 10. When the connecting hub 25 is connected to the rotor 23, the end of the connecting hub 25 without the stop convex ring 253 is inserted into the rotor 23, and the slot 252 is slidably engaged with the protruding part of the rotor 23 until the side wall of the rotor 23 abuts against the stop convex ring 253. In this way, the convenience and accuracy of assembling the connecting hub 25 and the rotor 23 are improved.

[0072] Please refer again Figure 1 and Figure 2In this embodiment, the motor 20 further includes a bearing 26, which is sleeved on one end of the rotating shaft 24 away from the extension section 121 and connected to the housing 21. By providing the bearing 26, the vibration of the rotating shaft 24, the crankshaft 12 and the rotor 23 during rotation can be reduced, the disturbance of the crankshaft 12 and the stability of the power output of the rotating shaft 24 and the crankshaft 12 are improved, and the vibration generated when the engine 10 and the motor 20 are running can be reduced.

[0073] In this embodiment, the casing 21 includes a shell 211 and an end cover 212. The shell 211 is arranged on the cylinder body 11. The shell 211 is provided with a receiving hole 2111 which passes through a side of the shell 211 close to the cylinder body 11 and a side of the shell 211 away from the cylinder body 11. The stator 22, the rotor 23 and the rotating shaft 24 are all arranged in the receiving hole 2111. The stator 22 is connected to the inner wall of the receiving hole 2111, and the extension section 121 extends into the receiving hole 2111. The end cover 212 is arranged at one end of the shell 211 away from the cylinder body 11, and the end cover 212 closes the end of the receiving hole 2111 away from the cylinder body 11. A mounting hole 2121 connected to the receiving hole 2111 is opened in the middle of the end cover 212, and the bearing 26 is arranged in the mounting hole 2121. In this way, by providing a receiving hole 2111 that passes through the side of the shell 211 close to the cylinder body 11, the side of the shell 211 facing the cylinder body 11 is open, thereby reducing the weight of the range extender assembly 100; by providing an end cover 212 to close the end of the receiving hole 2111 away from the cylinder body 11, it is convenient to install and repair the parts in the casing 21; by providing a mounting hole 2121 in the middle of the end cover 212 that is connected to the receiving hole 2111, it is convenient to install the bearing 26 and facilitate the end of the rotating shaft 24 away from the extension section 121 to extend out of the casing 21.

[0074] In this embodiment, the outer ring of the bearing 26 (not shown) can be loosely matched with the mounting hole 2121, thereby effectively avoiding slight misalignment of the end cover 212 during installation, which may cause the rotor 23 and the rotating shaft 24 of the motor 20 to jump, thereby helping to reduce the vibration generated when the engine 10 and the motor 20 are running.

[0075] In this embodiment, the end of the cylinder body 11 facing the housing 211 has a first flange 111, and the end of the housing 211 facing the cylinder body 11 has a second flange 2112 connected to the first flange 111. In this way, the cylinder body 11 and the housing 211 are connected by the flange, thereby improving the convenience and firmness of connecting the engine 10 and the motor 20.

[0076] In this embodiment, the housing 21 further includes a sealing member 213, which is detachably disposed on a side of the end cover 212 away from the receiving hole 2111, and the sealing member 213 seals the mounting hole 2121. By providing the sealing member 213 to seal the mounting hole 2121, it is possible to effectively prevent liquid and dust from entering the housing 21 to affect the normal operation of the motor 20, and it is also possible to effectively prevent the noise generated by the motor 20 during operation from being transmitted to the outside of the housing 21.

[0077] In this embodiment, the end of the rotating shaft 24 away from the extension section 121 has a connecting portion 241, and the connecting portion 241 is used to connect with an external driving device (not shown) so that the rotating shaft 24 and the crankshaft 12 can rotate and perform zero-position calibration under the drive of the external driving device. Specifically, the connecting portion 241 can be a hexagonal hole or an internal spline. After the range extender assembly 100 is assembled, it is necessary to perform zero-position calibration on the range extender assembly 100 to determine whether the range extender assembly 100 is assembled properly. During the zero-position calibration process, the closure 213 is first opened, and the connecting portion 241 is connected to the external driving device, and then the external driving device drives the rotating shaft 24 and the crankshaft 12 to rotate to about 1000rpm, and then the range extender assembly 100 is zero-position calibrated, and the closure 213 is installed on the end cover 212 again after calibration. By providing the connecting portion 241 at the end of the rotating shaft 24 away from the extending section 121 , it is helpful to improve the convenience of connecting the rotating shaft 24 to an external driving device and performing zero position calibration.

[0078] Please refer to Figure 4 In this embodiment, the range extender assembly 100 also includes a controller 30, and the motor 20 also includes a speed sensor 27. The speed sensor 27 is arranged on the housing 21 and is located on one side of the rotating shaft 24. The speed sensor 27 is electrically connected to the controller 30. The speed sensor 27 is used to sense the speed of the rotating shaft 24 so that the controller 30 controls the motor 20 to load or unload.

[0079] Since the engine 10 has multiple strokes, the crankshaft 12 is easily affected by the excitation of each stroke, which can easily lead to uneven rotation speed, causing greater vibration of the range extender assembly 100, especially during the startup and deceleration stages of the engine 10. By setting a rotation speed sensor 27 to sense the rotation speed of the rotating shaft 24, and the controller 30 controls the loading or unloading of the motor 20 according to the rotation speed of the rotating shaft 24, the motor 20 can be controlled to load when the engine 10 is loaded with high positive excitation, and the motor 20 can be controlled to unload when the engine 10 is loaded with low negative excitation, thereby realizing an active damping function, thereby optimizing the rotation speed fluctuations of the crankshaft 12 and the rotating shaft 24, and reducing the vibration generated by the range extender assembly 100 during operation. Figure 5 As shown, the controller 30 controls the motor 20 to load in the loading area and controls the motor 20 to unload in the unloading area, thereby optimizing the speed fluctuation of the crankshaft 12 and the rotating shaft 24 and realizing active vibration reduction of the range extender assembly 100 .

[0080] In this embodiment, the rotation speed sensor 27 may be disposed on the end cover 212 , and the rotating portion of the rotation speed sensor 27 rotates synchronously with the rotating shaft 24 .

[0081] In this embodiment, the controller 30 may include an engine controller 31 and a motor controller 32. The engine controller 31 is electronically connected to the engine 10, and the motor controller 32 is electronically connected to the motor 20. The engine controller 31 is electrically connected to the motor controller 32 and exchanges data. The speed sensor 27 is electrically connected to the motor controller 32 so that the motor controller 32 controls the loading or unloading of the motor 20 according to the sensing information of the speed sensor 27.

[0082] In summary, the range extender assembly 100 of the embodiment of the present application directly assembles the motor 20 to the cylinder block 11 of the engine 10, directly connects the crankshaft 12 to the rotating shaft 24, and sets a connecting hub 25 to connect the rotor 23 to the annular protrusion 1211 protruding on the crankshaft 12 or the rotating shaft 24, so that the integration of the engine 10 and the motor 20 is high, and the dual-mass flywheel structure is eliminated, the number of parts is reduced, and the size and cost of the integrated engine 10 and the motor 20 are reduced. In addition, since the connecting hub 25 and the rotor 23 can provide damping when the crankshaft 12 and the rotating shaft 24 rotate, it can effectively suppress large speed fluctuations when the crankshaft 12 and the rotating shaft 24 rotate, thereby improving the stability of the power output of the crankshaft 12 and the rotating shaft 24.

[0083] It is obvious to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above, and that the present application can be implemented in other specific forms without departing from the spirit or essential features of the present application. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present application.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the preferred embodiments, a person of ordinary skill in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. A range extender assembly, characterized in that: include: An engine comprises a cylinder block and a crankshaft rotatably disposed in the cylinder block, wherein the crankshaft has an extension section extending out of the cylinder block; The motor comprises a casing, a stator, a rotor, a rotating shaft and a connecting hub, wherein the casing is arranged on the cylinder body and covers the outer side of the extension section, the stator, the rotor and the rotating shaft are all arranged in the casing, and the rotating shaft is connected to the extension section and coaxially arranged, an annular protrusion is circumferentially protruded on one end of the extension section close to the rotating shaft or one end of the rotating shaft close to the extension section, the connecting hub is sleeved on the rotating shaft and connected to the annular protrusion, and the part of the connecting hub away from the rotating shaft is connected to the rotor.

2. The range extender assembly according to claim 1, characterized in that: The crankshaft and the rotating shaft are an integrated structure.

3. The range extender assembly according to claim 1, characterized in that: The annular protrusion is a flange structure, and the connecting hub has a flange plate corresponding to the annular protrusion, and the flange plate is detachably connected to the annular protrusion in a matching manner.

4. The range extender assembly according to claim 1, characterized in that: A slot extending along the axial direction of the connecting hub is provided on the circumferential side of the connecting hub, and the slot is used to engage with the rotor. A stop ring is provided on the circumferential side of the connecting hub protruding outward along the circumferential direction of the connecting hub, and the stop ring intersects with the slot. The stop ring is used to stop the rotor to limit the position of the rotor relative to the connecting hub.

5. The range extender assembly according to claim 1, characterized in that: One end of the rotating shaft away from the extending section has a connecting portion, and the connecting portion is used to be connected to an external driving device, so that the rotating shaft and the crankshaft are driven by the external driving device to rotate and perform zero position calibration.

6. The range extender assembly according to claim 1, characterized in that: The motor further comprises a bearing, which is sleeved on one end of the rotating shaft away from the extending section and connected to the housing.

7. The range extender assembly according to claim 6, characterized in that: The casing includes a shell and an end cover, the shell is arranged on the cylinder body, the shell is provided with a receiving hole which passes through a side of the shell close to the cylinder body and a side of the shell away from the cylinder body, the stator, the rotor and the rotating shaft are all arranged in the receiving hole, the stator is connected to the inner wall of the receiving hole, the extension section extends into the receiving hole, the end cover is arranged at one end of the shell away from the cylinder body, and the end cover closes the end of the receiving hole away from the cylinder body, a mounting hole connected to the receiving hole is arranged in the middle of the end cover, and the bearing is arranged in the mounting hole.

8. The range extender assembly according to claim 7, characterized in that: The housing further comprises a sealing member, which is detachably arranged on a side of the end cover away from the receiving hole, and the sealing member seals the mounting hole.

9. The range extender assembly according to claim 7, characterized in that: The cylinder body has a first flange at one end facing the housing, and the housing has a second flange connected to the first flange at one end facing the cylinder body.

10. The range extender assembly according to claim 1, characterized in that: The range extender assembly also includes a controller, and the motor also includes a speed sensor, which is arranged in the housing and located on one side of the rotating shaft, and the speed sensor is electrically connected to the controller. The speed sensor is used to sense the speed of the rotating shaft so that the controller controls the motor to load or unload.

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