Range extender cylinder body and range extender

Abstract

The utility model discloses a range extender cylinder body and a range extender and relates to the technical field of vehicles, the range extender cylinder body comprises a main cylinder body and a generator shell which are integrally arranged, a crankshaft cavity is arranged in the main cylinder body, the generator shell is arranged at the rear end of the main cylinder body, a motor cavity is arranged in the generator shell, and the motor cavity is correspondingly communicated with the crankshaft cavity. The rear end of the generator shell is provided with a port communicated with the motor cavity, and the port is configured to install a motor end cover. Compared with the prior art, the main cylinder body and the generator shell which are integrally arranged are adopted, the integrated structure is adopted, the mode that a generator is fixed through bolts in the prior art is avoided, the number of assembly parts can be reduced, the assembly structure is simplified, a conventional generator shell structure can be omitted, and the structure can be more compact; and the range extender is convenient to miniaturize, time-saving and labor-saving to assemble and low in cost, and the oil leakage risk is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle technical field, specifically, relate to a kind of range extender cylinder and range extender. BACKGROUND

[0002] The existing range extender assembly is generally the structure of engine+generator, and the traditional technology is to connect the generator assembly and the engine by bolts, wherein the cylinder of the engine part is not different from the ordinary engine cylinder. During production and assembly, the motor manufacturer usually transports the motor to the engine manufacturer after production, and the engine manufacturer uniformly assembles. During assembly, the generator is fixed on the rear end of the cylinder by bolts, and gaskets are added to the joint surface to prevent oil leakage.

[0003] Such split structure results in that the overall structure of the range extender assembly is long, heavy and complex, and needs to be assembled by different manufacturers, which leads to time-consuming and laborious assembly, high cost, and oil leakage risk at the joint surface after long-term use. SUMMARY

[0004] The utility model aims at providing a kind of range extender cylinder and range extender, which can reduce the number of assembly parts, simplify the assembly structure, and be beneficial to the miniaturization of the range extender, save time and labor during assembly, reduce cost, and reduce the risk of oil leakage.

[0005] The embodiment of the utility model is implemented as follows:

[0006] In one aspect, the utility model embodiment provides a range extender cylinder, which comprises a main cylinder and a generator shell arranged integrally, a crank cavity is arranged in the main cylinder, the generator shell is arranged at the rear end of the main cylinder, a motor cavity is arranged in the generator shell, the motor cavity is in communication with the crank cavity, and is configured to accommodate a motor assembly, a port is arranged at the rear end of the generator shell and communicates with the motor cavity, and the port is configured to mount a motor end cover.

[0007] In an optional embodiment, a partition wall is further formed at the rear end of the main cylinder, the partition wall is configured to separate the crank cavity and the motor cavity, a transmission opening is arranged on the partition wall, the transmission opening is configured to simultaneously communicate with the motor cavity and the crank cavity, and the partition wall is further configured to fix the motor assembly.

[0008] In an optional embodiment, a plurality of stator mounting seats are further arranged on the side of the partition wall close to the motor cavity, the stator mounting seats protrude towards the motor cavity, a stator mounting hole is arranged on each stator mounting seat, and the stator mounting hole is configured to fix the stator of the motor assembly.

[0009] In an optional embodiment, the outer wall of the generator housing is provided with a plurality of first reinforcing ribs, and the plurality of first reinforcing ribs extend to the outer wall of the main cylinder body.

[0010] In an optional embodiment, the outer wall of the generator housing is further provided with second reinforcing ribs, and the second reinforcing ribs are distributed along the circumference of the generator housing and are arranged in cross with the first reinforcing ribs.

[0011] In an optional embodiment, the main cylinder body comprises a cylinder barrel, a crankshaft housing and an oil pan, the cylinder barrel is integrally arranged at the top end of the crankshaft housing, the oil pan is detachably arranged at the bottom end of the crankshaft housing, the crankshaft housing and the oil pan are arranged to form the crankshaft cavity, the cylinder barrel is in communication with the crankshaft cavity, and the generator housing is integrally arranged at the rear end of the crankshaft housing and / or the oil pan.

[0012] In an optional embodiment, the generator housing comprises a first housing and a second housing, the first housing is integrally arranged at the rear end of the crankshaft housing, the second housing is integrally arranged at the rear end of the oil pan, and the first housing and the second housing are detachably connected and arranged to form the motor cavity.

[0013] In an optional embodiment, the rear end of the generator housing is provided with a flange ring, the flange ring is protruded outward relative to the outer wall of the generator housing, and the end face of the flange ring is configured to be attached to the edge of the end cover.

[0014] In an optional embodiment, a plurality of outwardly extending mounting lugs are arranged on the flange ring, each of the mounting lugs is provided with an end cover mounting hole and is configured to fix the motor end cover.

[0015] In another aspect, the utility model embodiment provides a range extender, which comprises a crankshaft, a motor assembly, a motor housing and the range extender cylinder body as described above, the crankshaft is arranged in the crankshaft cavity, the motor assembly is arranged in the motor cavity, the rotor of the motor assembly is in transmission connection with the rear end of the crankshaft, and the motor end cover is mounted on the port.

[0016] The utility model embodiment has the following beneficial effects:

[0017] The range extender cylinder and the range extender provided by the embodiment of the utility model, the generator shell is integrally arranged at the rear end of the main cylinder body, and a motor cavity is arranged in the generator shell, the motor cavity is communicated with the crank cavity in the main cylinder body, and the motor cavity can accommodate a motor assembly, and the rear end of the generator shell is provided with a port communicated with the motor cavity, the port is configured to install a motor end cover. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be briefly introduced the drawings needed to be used in the embodiment, it should be understood, the following drawings only show some embodiments of the utility model, therefore should not be regarded as the limitation to the scope, for the ordinary skilled person in the art, under the premise of not paying the creative labor, still can obtain other related drawings according to these drawings.

[0019] Figure 1 The top view of the range extender cylinder provided by the embodiment of the utility model is provided;

[0020] Figure 2 The partial structure schematic view of the range extender cylinder provided by the embodiment of the utility model is provided;

[0021] Figure 3 The internal structure schematic view of the range extender cylinder provided by the embodiment of the utility model is provided;

[0022] Figure 4 Figure 2 The structure schematic view of the range extender cylinder in another view is provided;

[0023] Figure 5 The front view of the range extender cylinder provided by the embodiment of the utility model is provided;

[0024] Figure 6 The structure schematic view of the range extender provided by the embodiment of the utility model is provided.

[0025] Icon:

[0026] 100 - range extender cylinder; 110 - main cylinder; 111 - crankcase; 112 - motor cavity; 113 - partition wall; 114 - drive opening; 115 - cylinder barrel; 116 - crankcase housing; 117 - oil pan; 130 - generator housing; 131 - port; 132 - first reinforcement rib; 133 - second reinforcement rib; 134 - first housing; 135 - second housing; 150 - stator mounting seat; 151 - stator mounting hole; 152 - structural reinforcement rib; 160 - flange ring; 161 - mounting lug; 162 - end cover mounting hole; 200 - range extender; 210 - motor assembly; 211 - stator; 213 - rotor; 230 - motor end cover. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0029] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0030] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0031] Furthermore, the terms "horizontal," "vertical," and the like are used herein to describe specific orientations of the components shown in the figures and are not meant to limit the scope of the application to only such orientations. For example, the term "horizontal" can mean a direction that is more horizontal than vertical, and the term "vertical" can mean a direction that is more vertical than horizontal. The terms "horizontal" and "vertical" can also mean a direction that is substantially horizontal or substantially vertical.

[0032] In the description of the present application, it should also be noted that, unless otherwise expressly specified and limited, the terms "arrange", "mount", "connect", "connect" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or electrically connected, it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] As disclosed in the background art, the existing conventional range extender adopts a split structure, the rear end of the cylinder body is designed with a bolt mounting hole corresponding to the generator assembly, the generator stator and the rear end cover are both mounted on the generator assembly, so professional motor manufacturers are needed for production and assembly. And the supply is carried out with the generator assembly, and the generator assembly is divided into many parts. And when assembling, the generator assembly is fastened to the corresponding rear end of the cylinder body with bolts, this kind of structure on the one hand has a complicated assembly process, involves a large number of parts, resulting in low assembly efficiency; on the other hand, it involves the separate assembly of two manufacturers (engine and generator) and transportation, and then assembly, resulting in high assembly cost.

[0034] In addition, the conventional range extender, due to the split design of the motor assembly and the engine assembly, requires the design of an end shell structure and the design of additional structures to realize bolt installation, so the length is large during assembly, which is not conducive to the miniaturization of the range extender.

[0035] In order to solve the above problems, the present application provides a novel range extender cylinder and range extender assembly, and the specific structure of the range extender cylinder and range extender assembly is introduced in detail below.

[0036] Referring to Figures 1 to 4 The embodiment of the present application provides a range extender cylinder 100, which comprises a main cylinder 110 and a generator shell 130 arranged integrally, the main cylinder 110 is provided with a crank cavity 111, the generator shell 130 is arranged at the rear end of the main cylinder 110, and the generator shell 130 is provided with a motor cavity 112, the motor cavity 112 is in communication with the crank cavity 111, and is configured to accommodate a motor assembly 210, and the rear end of the generator shell 130 is provided with a port 131 communicating with the motor cavity 112, and the port 131 is configured to install a motor end cover 230.

[0037] It should be noted that the main cylinder body 110 in the embodiment is based on the original cylinder body in design, and the main improvement point is the rear end design. The structure of the intake side, the exhaust side, the top surface of the cylinder body, the bottom surface of the cylinder body and the front end of the main cylinder body 110 are not changed, so the original cylinder body can be completely used. With this design idea, there are many advantages, for example, the main cylinder body 110 can use part of the original cylinder body mold, tooling, fixture and existing processing equipment of the manufacturer, which greatly shortens the development cycle and cost. At the same time, because the design structure of the intake side, the exhaust side, the top surface, the bottom surface and the front end of the main cylinder body 110 directly uses the original cylinder body design, the engine water pump, the water outlet chamber component, the water pipe, the oil pipe, the cylinder gasket, the timing chain cover, the suspension support and many other parts are directly borrowed, without the need for new design, which meets the universality of the parts, shortens the development cycle of the whole machine and reduces the cost. In addition, because the main cylinder body 110 is developed based on the original cylinder body, the development risk is reduced, and the probability of problems in the later stage is greatly reduced.

[0038] It should be noted that the main cylinder body 110 in the embodiment is based on the original cylinder body in design, and the main improvement point is the rear end design. The structure of the intake side, the exhaust side, the top surface of the cylinder body, the bottom surface of the cylinder body and the front end of the main cylinder body 110 are not changed, so the original cylinder body can be completely used. With this design idea, there are many advantages, for example, the main cylinder body 110 can use part of the original cylinder body mold, tooling, fixture and existing processing equipment of the manufacturer, which greatly shortens the development cycle and cost. At the same time, because the design structure of the intake side, the exhaust side, the top surface, the bottom surface and the front end of the main cylinder body 110 directly uses the original cylinder body design, the engine water pump, the water outlet chamber component, the water pipe, the oil pipe, the cylinder gasket, the timing chain cover, the suspension support and many other parts are directly borrowed, without the need for new design, which meets the universality of the parts, shortens the development cycle of the whole machine and reduces the cost. In addition, because the main cylinder body 110 is developed based on the original cylinder body, the development risk is reduced, and the probability of problems in the later stage is greatly reduced.

[0039] In some embodiments, the rear end of the main cylinder body 110 further forms a partition wall 113, the partition wall 113 is configured to separate the crank cavity 111 and the motor cavity 112, the partition wall 113 is provided with a transmission opening 114, the transmission opening 114 is configured to communicate with the motor cavity 112 and the crank cavity 111 at the same time, and the partition wall 113 is further configured to fix the motor assembly 210. Specifically, the partition wall 113 is the rear end wall of the main cylinder body 110, which can separate the motor cavity 112 and the crank cavity 111, and the transmission opening 114 can realize the transmission connection between the crankshaft and the rotor 213, so that the rotor 213 can be driven to rotate by the crankshaft, and power generation can be realized. For the power generation principle of the motor assembly 210, the existing generator structure can be referred to.

[0040] In some embodiments, the partition wall 113 is further provided with a plurality of stator mounting seats 150 on the side close to the motor cavity 112, the plurality of stator mounting seats 150 protrude towards the motor cavity 112, each stator mounting seat 150 is provided with a stator mounting hole 151 and is configured to fix the stator 211 of the motor assembly 210. Specifically, the plurality of stator mounting seats 150 are distributed around the transmission opening 114 in the circumferential direction, the stator 211 is provided with a corresponding mounting block, and the stator 211 can be fixed by screwing the mounting block into the stator mounting hole 151, and the stator 211 can be designed in close proximity to the partition wall 113, so that the overall structure is more compact.

[0041] It should be noted that the partition wall 113 is further provided with a plurality of structural reinforcing ribs 152 on the side close to the motor cavity 112 in the present embodiment, the plurality of structural reinforcing ribs 152 are distributed around the transmission opening 114 in a diverging manner, and the stator mounting seats 150 are arranged on some of the structural reinforcing ribs 152. By arranging the structural reinforcing ribs 152, the structural strength of the partition wall 113 can be enhanced to ensure the installation and fixation of the stator 211.

[0042] In some embodiments, the outer wall of the generator housing 130 is provided with a plurality of first reinforcing ribs 132 extending to the outer wall of the main cylinder body 110. Specifically, the first reinforcing ribs 132 extend in the front-rear horizontal direction, each first reinforcing rib 132 is integrally arranged on the outer wall of the generator housing 130 and the main cylinder body 110, and one end of the first reinforcing rib 132 extends to the front end of the main cylinder body 110 and the other end extends to the rear end of the generator housing 130. By arranging the first reinforcing rib 132, the strength of the cylinder body and the connection can be enhanced, so that the connection strength between the main cylinder body 110 and the generator housing 130 is higher and the structure is more stable.

[0043] In some embodiments, the outer wall of the generator housing 130 is further provided with a second reinforcing rib 133, the second reinforcing rib 133 is distributed in the circumferential direction of the generator housing 130 and is arranged in cross with the first reinforcing rib 132. Specifically, the second reinforcing rib 133 is integrally arranged on the outer wall of the generator housing 130 and is perpendicular to the first reinforcing rib 132, and the second reinforcing rib 133 is arranged around the generator housing 130. By arranging the second reinforcing rib 133, the structural strength of the generator housing 130 can be further enhanced, and the second reinforcing rib 133 and the first reinforcing rib 132 form a grid structure together, which greatly increases the structural strength of the generator housing 130 in the axial and circumferential directions.

[0044] Referring to Figure 5 and Figure 6In some embodiments, the main cylinder body 110 comprises a cylinder barrel 115, a crankcase 116 and an oil pan 117, the cylinder barrel 115 is integrally arranged at the top end of the crankcase 116, the oil pan 117 is detachably arranged at the bottom end of the crankcase 116, the crankcase 116 and the oil pan 117 are arranged to form a crank cavity 111, the cylinder barrel 115 is in communication with the crank cavity 111, and the generator housing 130 is integrally arranged at the rear end of the crankcase 116 and the oil pan 117. Specifically, the cylinder barrel 115 can be integrally formed at the top end of the crankcase 116, and the cylinder barrel 115 can be a 4-cylinder structure and is upwardly open, and the oil pan 117 is detachably arranged with the crankcase 116, facilitating the installation of crank and other components, and facilitating maintenance.

[0045] It should be noted that the main cylinder body 110 and the generator housing 130 in the embodiment can be made of cast aluminum or cast iron, and the finished product is formed by casting and machining.

[0046] In some embodiments, the generator housing 130 comprises a first housing 134 and a second housing 135, the first housing 134 is integrally arranged at the rear end of the crankcase 116, the second housing 135 is integrally arranged at the rear end of the oil pan 117, and the first housing 134 and the second housing 135 are detachably connected and arranged to form a motor cavity 112. Specifically, the bottom end of the first housing 134 is flush with the bottom end of the crankcase 116, the top end of the second housing 135 is flush with the top end of the oil pan 117, the first housing 134 is integrally formed with the crankcase 116, and the second housing 135 is integrally formed with the oil pan 117, so that the assembly of the first housing 134 and the second housing 135 can be completed when the crankcase 116 and the oil pan 117 are assembled.

[0047] In other preferred embodiments of the utility model, the generator housing 130 can also adopt an integral structure, at this time the generator housing 130 is integrally arranged at the rear end of the crankcase 116 or the rear end of the oil pan 117, and the specific structural form is not limited here.

[0048] Please continue to see Figures 1 to 4 In some embodiments, the rear end of the generator housing 130 is provided with a flange ring 160, the flange ring 160 protrudes outward relative to the outer wall of the generator housing 130, and the end face of the flange ring 160 is configured to be attached to the edge of the end cover. Specifically, the flange ring 160 is arranged at the rear end of the first housing 134 and the rear end of the second housing 135 respectively, the flange ring 160 protrudes outward, so as to form an end face with sufficient width, facilitating the attachment to the edge of the end cover, and further improving the structural sealing performance.

[0049] Further, the flange ring 160 is provided with a plurality of outwardly extending mounting lugs 161, each of which is provided with an end cover mounting hole 162 and is configured to fix the motor end cover 230. Specifically, the edge of the motor end cover 230 is also provided with a mounting block, and the mounting block is fixed with the mounting lug 161 through a mounting bolt, which is matched with the end cover mounting hole 162 after passing through the mounting block, so as to further ensure the fixing and sealing effect of the motor end cover 230.

[0050] With reference to Figure 6 The utility model discloses an embodiment further provides a range extender 200, including crankshaft (not shown in the drawing), motor assembly 210, motor end cover 230 and preceding range extender cylinder body 100, range extender cylinder body 100 includes integrative main cylinder body 110 and generator housing 130 that set up, be provided with crankshaft cavity 111 in main cylinder body 110, and generator housing 130 sets up at the rear end of main cylinder body 110, and be provided with motor cavity 112 in generator housing 130, and motor cavity 112 communicates with the corresponding crankshaft cavity 111, and the rear end of generator housing 130 is provided with the port 131 that communicates to motor cavity 112, and the crankshaft sets up in crankshaft cavity 111, and motor assembly 210 sets up in motor cavity 112, and the rotor 213 of motor assembly 210 is transmission connection with the rear end of crankshaft, and motor end cover 230 installs on the port 131.

[0051] It needs to be explained that the range extender 200 in the embodiment, since main cylinder body 110 integrates generator housing 130, can directly satisfy the assembly of the stator 211 and rotor 213 of motor assembly 210, and need not install generator assembly separately at the rear end of engine.

[0052] In summary, the range extender cylinder body 100 and the range extender 200 provided by the utility model embodiment set up the generator housing 130 integrally at the rear end of the main cylinder body 110, and the motor cavity 112 is arranged in the generator housing 130, the motor cavity 112 communicates with the crankshaft cavity 111 in the main cylinder body 110, can accommodate the motor assembly 210, and the rear end of the generator housing 130 is provided with the port 131 that communicates to the motor cavity 112, and the port 131 is configured to install the motor end cover 230. The utility model embodiment adopts the main cylinder body 110 and the generator housing 130 that set up integrally, adopts the integrated structure, avoids the mode of fixing the generator by bolt in the prior art, can reduce the number of assembly parts, simplifies the assembly structure, and can save the conventional generator shell structure, the structure can be more compact, is favorable to the miniaturization of the range extender 200, saves time and labor in assembly, is low in cost, and reduces the risk of oil seepage.

[0053] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An augmenter cylinder, characterized by, The main cylinder body (110) and the generator shell (130) are integrally arranged, the crankshaft cavity (111) is arranged in the main cylinder body (110), the generator shell (130) is arranged at the rear end of the main cylinder body (110), the motor cavity (112) is arranged in the generator shell (130), the motor cavity (112) is communicated with the crankshaft cavity (111) in correspondence, and is configured to accommodate the motor assembly (210); the rear end of the generator shell (130) is provided with a port (131) communicated with the motor cavity (112), and the port (131) is configured to install the motor end cover (230). The rear end of the main cylinder body (110) is further formed with a partition wall (113), the partition wall (113) is configured to separate the crankshaft cavity (111) and the motor cavity (112), the partition wall (113) is provided with a transmission opening (114), the transmission opening (114) is configured to be communicated with the motor cavity (112) and the crankshaft cavity (111) at the same time, and the partition wall (113) is further configured to fix the motor assembly (210); the side of the partition wall (113) close to the motor cavity (112) is further provided with a plurality of stator mounting seats (150), the plurality of stator mounting seats (150) are protruded towards the motor cavity (112), each stator mounting seat (150) is provided with a stator mounting hole (151) and is configured to fix the stator (211) of the motor assembly (210).

2. The range extender cylinder of claim 1, wherein, The outer wall of the generator shell (130) is provided with a plurality of first reinforcing ribs (132), and the plurality of first reinforcing ribs (132) extend to the outer wall of the main cylinder body (110).

3. The range extender cylinder of claim 2, wherein, The outer wall of the generator shell (130) is further provided with a second reinforcing rib (133), the second reinforcing rib (133) is distributed along the circumference of the generator shell (130) and is arranged in cross with the first reinforcing rib (132).

4. The range extender cylinder of claim 1, wherein, The main cylinder body (110) comprises a cylinder barrel (115), a crankshaft shell (116) and an oil pan (117), the cylinder barrel (115) is integrally arranged at the top end of the crankshaft shell (116), the oil pan (117) is detachably arranged at the bottom end of the crankshaft shell (116), the crankshaft shell (116) and the oil pan (117) are arranged to form the crankshaft cavity (111), the cylinder barrel (115) is communicated with the crankshaft cavity (111), and the generator shell (130) is integrally arranged at the rear end of the crankshaft shell (116) and / or the oil pan (117).

5. The range extender cylinder of claim 4, wherein, The generator shell (130) comprises a first shell (134) and a second shell (135), the first shell (134) is integrally arranged at the rear end of the crankshaft shell (116), the second shell (135) is integrally arranged at the rear end of the oil pan (117), and the first shell (134) and the second shell (135) are detachably connected and arranged to form the motor cavity (112).

6. The range extender cylinder of claim 1, wherein, The rear end of the generator housing (130) is provided with a flange ring (160) which protrudes outward relative to the outer wall of the generator housing (130), and the end face of the flange ring (160) is configured to be in contact with the edge of the end cover.

7. The range extender cylinder of claim 6, wherein, A plurality of outwardly extending mounting lugs (161) are provided on the flange ring (160), and each mounting lug (161) is provided with an end cover mounting hole (162) configured to fix the motor end cover (230).

8. A range extender (200), characterized in that, The range extender cylinder body of any one of claims 1-7, comprising a crankshaft, a motor assembly (210), a motor end cover (230), and the range extender cylinder body, the crankshaft is arranged in the crankshaft cavity (111), the motor assembly (210) is arranged in the motor cavity (112), and the rotor (213) of the motor assembly (210) is in driving connection with the rear end of the crankshaft, and the motor end cover (230) is mounted on the port (131).

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