Range extender and vehicle

Abstract

The present invention discloses a range extender and a car, and relates to the technical field of new energy vehicles. The device includes a first cylinder module and a second cylinder module, wherein a first crankshaft is provided in the first cylinder module, and a second crankshaft is provided in the second cylinder module; a generator is located between the first cylinder module and the second cylinder module, and one end of the generator is connected to the second crankshaft, and the other end is provided with an elastic coupling, and is connected to the first crankshaft through an elastic coupling. The generator of the present application is connected to the left crankshaft through an elastic coupling component to ensure that the vibration energy is absorbed by the coupling when the engine has large fluctuations in speed / torque, and at the same time, the NVH performance of the range extender and the stability of the output current / power are ensured when the range extender is started or in variable power conditions, so as to avoid abnormal fluctuations and protect the power battery and power components from failures caused by abnormal peak voltages. Compared with the traditional arrangement of the generator on the outside of the engine, the integration is higher and the volume is relatively smaller.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular to a range extender and a vehicle. Background Art

[0002] With the development of the automobile industry, new energy vehicles have become the main development direction of the automobile industry. However, the range of pure electric vehicles has become a major limitation due to factors such as battery energy density and low-temperature power retention. At the same time, the number of charging piles and grid load also limit the rapid development of pure electric vehicles. Therefore, the range-extending system configuration can effectively make up for the above two problems and has become the main technical path for new energy vehicles. The range extender refers to a combination of an engine, a generator, and a generator controller. Due to the curb weight of extended-range electric vehicles, the wheelbase is relatively large and the longitudinal beam opening size is small. In order to obtain better tire suspension layout space, larger tires can be configured, and space for double wishbone suspension upgrades can be reserved to further reduce the turning radius. It is necessary to compress the layout space of the range extender in the cabin, so higher requirements are put forward for the miniaturization of the range extender.

[0003] In the related technology, in order to improve the miniaturization of the range extender, the rotor of the generator is integrated with the engine crankshaft (that is, the torque limiting shock absorber between the two is eliminated), thereby compressing the axial space of the range extender. However, since the engine will inevitably have abnormal combustion phenomena (detonation, pre-ignition) during operation. Therefore, the torque / speed output of the crankshaft will fluctuate, and the elimination of the torque limiting shock absorber will inevitably lead to operational shocks of the range extender system and cause NVH degradation. In extreme cases, it may even cause fatigue fracture of the motor shaft (such as frequent start and stop of the range extender or reverse dragging of the motor), abnormal overcharging of the high-voltage battery, and bring safety risks to the high-voltage system of the entire vehicle. Summary of the invention

[0004] In order to increase the miniaturization of the range extender in the existing technology, the torque limiting shock absorber is cancelled, which makes it difficult for the range extender to cope with the fluctuation of the torque / speed output of the crankshaft, resulting in degradation of NVH performance, fatigue fracture of the motor shaft, and even abnormal overcharging of the high-voltage battery, posing safety risks to the high-voltage system of the entire vehicle.

[0005] In a first aspect, the present application provides a range extender, which comprises: an engine block and a generator;

[0006] An engine cylinder block, in which a first cylinder module and a second cylinder module are arranged at intervals, a first crankshaft is arranged in the first cylinder module, and a second crankshaft is arranged in the second cylinder module;

[0007] A generator is arranged in the engine cylinder body and located between the first cylinder module and the second cylinder module. One end of the generator is connected to the second crankshaft, and the other end is provided with an elastic coupling and connected to the first crankshaft through the elastic coupling.

[0008] In combination with the first aspect, in some embodiments, a generator controller is integrated in the engine cylinder body, and the generator controller is installed between the first cylinder module and the second cylinder module.

[0009] In combination with the first aspect, in some embodiments, the top of the generator is plugged into the generator controller via a three-phase copper busbar.

[0010] In combination with the first aspect, in some embodiments, an oil storage space and a partition portion are provided at the bottom of the engine cylinder block, and the partition portion divides the oil storage space into two engine oil storage areas and one power generation area oil storage area.

[0011] In combination with the first aspect, in some embodiments, the partition portion is provided with a through hole for the first crankshaft or the second crankshaft to pass through, and an oil seal is provided in the through hole.

[0012] In combination with the first aspect, in some embodiments, the generator includes:

[0013] a rotor shaft, one end of which is connected to the second crankshaft, and the other end of which is connected to the first crankshaft via the elastic coupling;

[0014] a stator disposed below the rotor shaft;

[0015] A motor cooling assembly is partially disposed in the oil storage area of ​​the power generation area, and the motor cooling assembly is used to pump the cooling oil in the oil storage area of ​​the power generation area to the rotor shaft.

[0016] In combination with the first aspect, in some embodiments, the motor cooling assembly includes:

[0017] A cooling oil pump, which is arranged in the oil storage area of ​​the power generation area;

[0018] A cooling oil circuit has one end connected to a cooling oil pump and the other end of the nozzle corresponding to the position of the rotor shaft.

[0019] In combination with the first aspect, in some embodiments, the first cylinder module and the second cylinder module each include two cylinders arranged side by side, and the piston connecting rods in two adjacent cylinders are connected through the first crankshaft or the second crankshaft.

[0020] In combination with the first aspect, in some embodiments, each of the oil cylinders is provided with a spark plug.

[0021] In a second aspect, please provide an automobile, which includes: a range extender as described in any one of the above items.

[0022] In summary, the present application arranges the generator in the middle of the engine, adopts a two-section crankshaft, and the generator rotor shaft assembly is integrally formed with the split crankshaft, wherein the generator and the left section crankshaft are connected by an elastic coupling component, ensuring that when the engine has large speed / torque fluctuations, the coupling absorbs vibration energy, and at the same time ensures the NVH performance of the range extender and the stability of the output current / power when the range extender is started or the power is changed, avoiding abnormal fluctuations, and protecting the power battery and power components from failures caused by abnormal spike voltages. Compared with the traditional arrangement of the generator on the outside of the engine, it has a higher degree of integration and a relatively smaller volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 is a schematic diagram of a range extender in an embodiment of the present invention;

[0025] Figure 2 It is a partial comparison diagram of the range extender in the embodiment of the present invention and the range extender in the related art.

[0026] In the figure: 1. engine block; 11. first cylinder module; 111. first crankshaft; 12. second cylinder module; 121. second crankshaft; 13. partition; 131. through hole; 132. oil seal; 133. spark plug; 14. power generation area oil storage area; 15. engine oil storage area; 16. cylinder; 161. piston connecting rod; 2. generator; 21. rotor shaft; 22. elastic coupling; 23. stator; 24. motor cooling assembly; 241. cooling oil pump; 242. cooling oil circuit; 3. generator controller. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0028] The embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. It should be further explained that in some embodiments, the integrated solution of the range extender is to integrate the generator rotor with the engine crankshaft, that is, to cancel the torque limiting shock absorber in the middle, compress the axial space by about 40-50mm, and reduce the size to a certain extent. However, since the engine will inevitably have abnormal combustion phenomena (knock, pre-ignition) during operation, the torque / speed output of the crankshaft may fluctuate, which will inevitably cause the motor rotor speed / torque to change dramatically, thereby causing the input / output current of the generator controller to fluctuate. When the current fluctuation value exceeds the limit value of the power component IGBT and the driver chip, it may cause the motor output power to overshoot, and in extreme cases cause the IGBT to explode, the high-voltage battery to be abnormally overcharged, and at the same time bring safety risks to the high-voltage system of the whole vehicle. However, due to the existence of speed / torque fluctuations and the cancellation of the torque limiting shock absorber, it will inevitably cause the operation impact of the range extender system and cause NVH degradation, affecting the sound quality of the whole vehicle. In addition, since the crankshaft and the generator rotor shaft are rigidly connected and there is no traditional torque limiting shock absorber, the motor shaft end will be subjected to greater impact and alternating loads during the start-up or change of operating conditions of the range extender. In extreme cases, fatigue fracture of the motor shaft may occur (such as frequent starting and stopping of the range extender or reverse operation of the motor).

[0029] In order to increase the miniaturization of the range extender in the existing technology, the torque limiting shock absorber is cancelled, which makes it difficult for the range extender to cope with the fluctuation of the torque / speed output of the crankshaft, resulting in degradation of NVH performance, fatigue fracture of the motor shaft, and even abnormal overcharging of the high-voltage battery, posing safety risks to the high-voltage system of the entire vehicle.

[0030] First, as Figure 1 As shown, the present application provides a range extender, which includes: an engine cylinder 1 and a generator 2; wherein,

[0031] The engine block 1 has a first cylinder module 11 and a second cylinder module 12 arranged therein, wherein the first cylinder module 11 has a first crankshaft 111 arranged therein, and the second cylinder module 12 has a second crankshaft 121 arranged therein. The generator 2 is arranged in the engine block 1 and between the first cylinder module 11 and the second cylinder module 12, wherein one end of the generator 2 is connected to the second crankshaft 121, and the other end of the generator 2 is provided with an elastic coupling 22, and is connected to the first crankshaft 111 through the elastic coupling 22.

[0032] It should be noted that the generator 2 is arranged in the middle position of the engine cylinder block 1, and adopts a two-section crankshaft, and the generator rotor shaft assembly is integrally formed with the split crankshaft, wherein the generator 2 is connected to the first crankshaft 111 through an elastic coupling 22 to ensure that when the engine speed / torque fluctuates greatly, the coupling mentioned in Document 3 has the same function as that described in this case. Vibration energy is absorbed by the elastic coupling 22, and at the same time, the NVH performance of the range extender and the stability of the output current / power are ensured when the range extender is started or the power is changed. Abnormal fluctuations are avoided, and the power battery and power components are protected from failures caused by abnormal peak voltages. Compared with the traditional generator arranged on the outside of the engine, it has a higher degree of integration and a relatively smaller size. The purpose is to reduce and weaken the impact and vibration during the start and stop process of the range extender, while reducing the risk of journal fatigue and reducing the axial space size. Furthermore, if Figure 2 As shown, the present application eliminates the torque limiting shock absorber and the engine flywheel, and integrates the generator rotor with the crankshaft, which can effectively compress the axial size of the range extender (about 40-50m), improve the space utilization of the range extender, and achieve miniaturization.

[0033] It is understandable that in order to save axial space, the generator and the generator controller assembly are arranged in the middle of the engine, which is more integrated and relatively smaller in size than the traditional generator arranged on the outside of the engine.

[0034] Furthermore, the split crankshaft is intended to achieve disconnection or connection by engaging the left and right motors. The main intention is to achieve the target power generation requirement by disconnecting the crankshaft under low load conditions, reducing the additional drag load and ignition energy of the integral crankshaft.

[0035] In some preferred embodiments, a generator controller 3 is integrated in the engine cylinder 1, and the generator controller 3 is installed between the first cylinder module 11 and the second cylinder module 12. Furthermore, the top of the generator 2 is plugged into the generator controller 3 through a three-phase copper busbar.

[0036] It should be noted that the generator controller 3 (i.e., GCU) is arranged as a whole just above the generator 2 and between the first cylinder module 11 and the second cylinder module 12 of the engine. The three-phase copper busbar of the generator 2 is directly plugged into the generator controller 3. The three-phase current is filtered and rectified by the power component IGBT and then outputs DC direct current to the power battery. This configuration reduces the high-voltage three-phase line connection of the traditional range extender, effectively saving space and cost.

[0037] In some preferred embodiments, the bottom of the engine cylinder block 1 is provided with an oil storage space and a partition 13, and the partition 13 divides the oil storage space into two engine oil storage areas 15 and one power generation area oil storage area 14. Furthermore, the partition 13 is provided with a through hole 131 for the first crankshaft 111 or the second crankshaft 121 to pass through, and an oil seal 132 is provided in the through hole 131.

[0038] It can be understood that the generator cooling oil and the engine oil are both stored in the oil storage space of the integrated oil pan, and the two oil storage areas are separated by the partition part 13. At the same time, the generator separates the engine crankcase (i.e., the first cylinder module 11 and the second cylinder module 12) from the generator case through the front and rear built-in oil seals to avoid oil and gas leakage.

[0039] Specifically, Figure 1 As shown, the generator 2 includes: a rotor shaft 21, a stator 23 and a motor cooling assembly 24; wherein,

[0040] The rotor shaft 21 has one end connected to the second crankshaft 121, and the other end connected to the first crankshaft 111 through the elastic coupling 22. The stator 23 is arranged below the rotor shaft 21. The motor cooling assembly 24 is partially arranged in the oil storage area 14 of the power generation area, and the motor cooling assembly 24 is used to pump the cooling oil in the oil storage area 14 of the power generation area to the rotor shaft 21.

[0041] Furthermore, in order to achieve better cooling and improve power generation efficiency, the motor cooling assembly 24 includes: a cooling oil pump 241 and a cooling oil circuit 242; wherein,

[0042] A cooling oil pump 241 is disposed in the oil storage area 14 of the power generation area; a cooling oil circuit 242 has one end connected to the cooling oil pump 241 and the other end corresponding to the position of the rotor shaft 21 .

[0043] It can be understood that in the above embodiment, an electronic machine cooling oil pump 241 is also provided in the oil storage area 14 of the power generation area. The cooling oil is injected into the rotor (generally injected into the hollow shaft of the rotor shaft 21) through the operation of the pump body, and then sprayed at the stator 23 and the winding at a fixed point through the radial oil channel of the rotor, which can fully cool the motor and avoid overheating.

[0044] Preferably, the first cylinder module 11 and the second cylinder module 12 each include two cylinders 16 arranged side by side, and the piston connecting rods 161 in two adjacent cylinders 16 are connected through the first crankshaft 111 or the second crankshaft 121. Optionally, in order to facilitate the user to flexibly adjust and control, each cylinder 16 is provided with a spark plug 133.

[0045] It can be understood that the generator controller 3 can independently control each spark plug 133 to adjust the engine ignition strategy.

[0046] In a second aspect, the present application provides an automobile power system, which includes a range extender, the range extender including: an engine cylinder 1 and a generator 2; wherein:

[0047] The engine block 1 has a first cylinder module 11 and a second cylinder module 12 arranged therein, wherein the first cylinder module 11 has a first crankshaft 111 arranged therein, and the second cylinder module 12 has a second crankshaft 121 arranged therein. The generator 2 is arranged in the engine block 1 and between the first cylinder module 11 and the second cylinder module 12, wherein one end of the generator 2 is connected to the second crankshaft 121, and the other end of the generator 2 is provided with an elastic coupling 22, and is connected to the first crankshaft 111 through the elastic coupling 22.

[0048] Furthermore, the split crankshaft is intended to achieve disconnection or connection by engaging the left and right motors. The main intention is to achieve the target power generation requirement by disconnecting the crankshaft under low load conditions, reducing the additional drag load and ignition energy of the integral crankshaft.

[0049] In some preferred embodiments, a generator controller 3 is integrated in the engine cylinder 1, and the generator controller 3 is installed between the first cylinder module 11 and the second cylinder module 12. Furthermore, the top of the generator 2 is plugged into the generator controller 3 through a three-phase copper busbar.

[0050] In some preferred embodiments, the bottom of the engine cylinder block 1 is provided with an oil storage space and a partition 13, and the partition 13 divides the oil storage space into two engine oil storage areas 15 and one power generation area oil storage area 14. Furthermore, the partition 13 is provided with a through hole 131 for the first crankshaft 111 or the second crankshaft 121 to pass through, and an oil seal 132 is provided in the through hole 131.

[0051] Specifically, Figure 1 As shown, the generator 2 includes: a rotor shaft 21, a stator 23 and a motor cooling assembly 24; wherein,

[0052] The rotor shaft 21 has one end connected to the second crankshaft 121, and the other end connected to the first crankshaft 111 through the elastic coupling 22. The stator 23 is arranged below the rotor shaft 21. The motor cooling assembly 24 is partially arranged in the oil storage area 14 of the power generation area, and the motor cooling assembly 24 is used to pump the cooling oil in the oil storage area 14 of the power generation area to the rotor shaft 21.

[0053] Furthermore, in order to achieve better cooling and improve power generation efficiency, the motor cooling assembly 24 includes: a cooling oil pump 241 and a cooling oil circuit 242; wherein,

[0054] A cooling oil pump 241 is disposed in the oil storage area 14 of the power generation area; a cooling oil circuit 242 has one end connected to the cooling oil pump 241 and the other end corresponding to the position of the rotor shaft 21 .

[0055] Preferably, the first cylinder module 11 and the second cylinder module 12 each include two cylinders 16 arranged side by side, and the piston connecting rods 161 in two adjacent cylinders 16 are connected through the first crankshaft 111 or the second crankshaft 121. Optionally, in order to facilitate the user to flexibly adjust and control, each cylinder 16 is provided with a spark plug 133.

[0056] In a third aspect, the present application provides a vehicle, which includes: a range extender, which includes: an engine cylinder block 1 and a generator 2; wherein:

[0057] The engine block 1 has a first cylinder module 11 and a second cylinder module 12 arranged therein, wherein the first cylinder module 11 has a first crankshaft 111 arranged therein, and the second cylinder module 12 has a second crankshaft 121 arranged therein. The generator 2 is arranged in the engine block 1 and between the first cylinder module 11 and the second cylinder module 12, wherein one end of the generator 2 is connected to the second crankshaft 121, and the other end of the generator 2 is provided with an elastic coupling 22, and is connected to the first crankshaft 111 through the elastic coupling 22.

[0058] It should be noted that the generator 2 is arranged in the middle position of the engine cylinder block 1, and adopts a two-section crankshaft, and the generator rotor shaft assembly is integrally formed with the split crankshaft, wherein the generator 2 is connected to the first crankshaft 111 through an elastic coupling 22 to ensure that when the engine speed / torque fluctuates greatly, the coupling mentioned in Document 3 has the same function as that described in this case. Vibration energy is absorbed by the elastic coupling 22, and at the same time, the NVH performance of the range extender and the stability of the output current / power are ensured when the range extender is started or the power is changed. Abnormal fluctuations are avoided, and the power battery and power components are protected from failures caused by abnormal peak voltages. Compared with the traditional generator arranged on the outside of the engine, it has a higher degree of integration and a relatively smaller size. The purpose is to reduce and weaken the impact and vibration during the start and stop process of the range extender, while reducing the risk of journal fatigue and reducing the axial space size. Furthermore, if Figure 2 As shown, the present application eliminates the torque limiting shock absorber and the engine flywheel, and integrates the generator rotor with the crankshaft, which can effectively compress the axial size of the range extender (about 40-50mm), improve the space utilization of the range extender, and achieve miniaturization.

[0059] It is understandable that in order to save axial space, the generator and the generator controller assembly are arranged in the middle of the engine, which is more integrated and relatively smaller in size than the traditional generator arranged on the outside of the engine.

[0060] Furthermore, the split crankshaft is intended to achieve disconnection or connection by engaging the left and right motors. The main intention is to achieve the target power generation requirement by disconnecting the crankshaft under low load conditions, reducing the additional drag load and ignition energy of the integral crankshaft.

[0061] In some preferred embodiments, a generator controller 3 is integrated in the engine cylinder 1, and the generator controller 3 is installed between the first cylinder module 11 and the second cylinder module 12. Furthermore, the top of the generator 2 is plugged into the generator controller 3 through a three-phase copper busbar.

[0062] It should be noted that the generator controller 3 (i.e., GCU) is arranged as a whole just above the generator 2 and between the first cylinder module 11 and the second cylinder module 12 of the engine. The three-phase copper busbar of the generator 2 is directly plugged into the generator controller 3. The three-phase current is filtered and rectified by the power component IGBT and then outputs DC direct current to the power battery. This configuration reduces the high-voltage three-phase line connection of the traditional range extender, effectively saving space and cost.

[0063] In some preferred embodiments, the bottom of the engine cylinder block 1 is provided with an oil storage space and a partition 13, and the partition 13 divides the oil storage space into two engine oil storage areas 15 and one power generation area oil storage area 14. Furthermore, the partition 13 is provided with a through hole 131 for the first crankshaft 111 or the second crankshaft 121 to pass through, and an oil seal 132 is provided in the through hole 131.

[0064] It can be understood that the generator cooling oil and the engine oil are both stored in the oil storage space of the integrated oil pan, and the two oil storage areas are separated by the partition part 13. At the same time, the generator separates the engine crankcase (i.e., the first cylinder module 11 and the second cylinder module 12) from the generator case through the front and rear built-in oil seals to avoid oil and gas leakage.

[0065] Specifically, Figure 1 As shown, the generator 2 includes: a rotor shaft 21, a stator 23 and a motor cooling assembly 24; wherein,

[0066] The rotor shaft 21 has one end connected to the second crankshaft 121, and the other end connected to the first crankshaft 111 through the elastic coupling 22. The stator 23 is arranged below the rotor shaft 21. The motor cooling assembly 24 is partially arranged in the oil storage area 14 of the power generation area, and the motor cooling assembly 24 is used to pump the cooling oil in the oil storage area 14 of the power generation area to the rotor shaft 21.

[0067] Furthermore, in order to achieve better cooling and improve power generation efficiency, the motor cooling assembly 24 includes: a cooling oil pump 241 and a cooling oil circuit 242; wherein,

[0068] A cooling oil pump 241 is disposed in the oil storage area 14 of the power generation area; a cooling oil circuit 242 has one end connected to the cooling oil pump 241 and the other end corresponding to the position of the rotor shaft 21 .

[0069] It can be understood that in the above embodiment, an electronic machine cooling oil pump 241 is also provided in the oil storage area 14 of the power generation area. The cooling oil is injected into the rotor (generally injected into the hollow shaft of the rotor shaft 21) through the operation of the pump body, and then sprayed at the stator 23 and the winding at a fixed point through the radial oil channel of the rotor, which can fully cool the motor and avoid overheating.

[0070] Preferably, the first cylinder module 11 and the second cylinder module 12 each include two cylinders 16 arranged side by side, and the piston connecting rods 161 in two adjacent cylinders 16 are connected through the first crankshaft 111 or the second crankshaft 121. Optionally, in order to facilitate the user to flexibly adjust and control, each cylinder 16 is provided with a spark plug 133.

[0071] It can be understood that the generator controller 3 can independently control each spark plug 133 to adjust the engine ignition strategy.

[0072] In summary, the present application arranges the generator in the middle of the engine, adopts a two-stage crankshaft, and the generator rotor shaft assembly is integrally formed with the split crankshaft, wherein the generator and the left section crankshaft are connected by an elastic coupling original, ensuring that the engine absorbs vibration energy through the coupling when the speed / torque fluctuates greatly, and at the same time, the NVH performance of the range extender and the stability of the output current / power are ensured when the range extender is started or the power is changed. Abnormal fluctuations are avoided, and the power battery and power components are protected from failures caused by abnormal peak voltage. Compared with the traditional generator arranged outside the engine, the integration is higher and the volume is relatively smaller. Furthermore, the split crankshaft is intended to achieve disconnection or connection by the attraction of the left and right motors. The main intention is to achieve the target power generation demand by disconnecting the crankshaft under low load conditions, reducing the additional drag load and ignition energy of the integral crankshaft. At the same time, the high-voltage three-phase line between the generator and the controller is cancelled, and the copper bus is directly connected to optimize the cabin layout integration and reduce the Z-direction height by about 50mm. In addition, the oil pan integrates the oil storage space of the engine and the generator. Finally, the current traditional torque-limiting shock absorber can effectively improve speed fluctuations and impacts, ensuring NVH performance, but it is contrary to the direction of miniaturization. Therefore, under the premise of size compression, by adding coupling elastic elements, NVH performance can be optimized and the axial space of the range extender can be saved. At the same time, adding elastic elements can absorb / buffer the output torque fluctuations caused by engine knock / pre-ignition, avoid potential power generation current / voltage fluctuations, and thus protect the controller and battery components.

[0073] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present 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. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0074] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0075] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A range extender, characterized in that: include: An engine cylinder block (1) having a first cylinder module (11) and a second cylinder module (12) arranged therein at intervals, wherein a first crankshaft (111) is arranged in the first cylinder module (11), and a second crankshaft (121) is arranged in the second cylinder module (12); A generator (2) is arranged in the engine cylinder block (1) and is located between the first cylinder module (11) and the second cylinder module (12); one end of the generator (2) is connected to the second crankshaft (121); the other end is provided with an elastic coupling (22) and is connected to the first crankshaft (111) through the elastic coupling (22); the generator (2) comprises: a rotor shaft (21), a stator (23) and a motor cooling assembly (24); one end of the rotor shaft (21) is connected to the second crankshaft (121) and the other end is connected to the first crankshaft (111) through the elastic coupling (22); the stator (23) is arranged below the rotor shaft (21); the motor cooling assembly (24) is partially arranged in the engine cylinder block (1); the motor cooling assembly (24) is used to pump cooling oil to the rotor shaft (21); The motor cooling assembly (24) comprises: a cooling oil pump (241) and a cooling oil circuit (242); one end of the cooling oil circuit (242) is connected to the cooling oil pump (241), and the other end of the cooling oil circuit (242) is connected through a hollow shaft of the rotor shaft (21); the cooling oil circuit (242) can spray cooling oil to the stator (23) through the hollow shaft of the rotor shaft (21) and the oil channel.

2. The range extender according to claim 1, characterized in that: A generator controller (3) is integrated in the engine cylinder body (1), and the generator controller (3) is installed between the first cylinder module (11) and the second cylinder module (12).

3. The range extender according to claim 2, characterized in that: The top of the generator (2) is plugged into the generator controller (3) via a three-phase copper busbar.

4. The range extender according to claim 1, characterized in that: The bottom of the engine cylinder (1) is provided with an oil storage space and a partition portion (13), and the partition portion (13) divides the oil storage space into two engine oil storage areas (15) and one power generation area oil storage area (14).

5. The range extender according to claim 4, characterized in that: The partition plate portion (13) is provided with a through hole (131) for the first crankshaft (111) or the second crankshaft (121) to pass through, and an oil seal (132) is provided in the through hole (131).

6. The range extender according to claim 1, characterized in that: The first cylinder module (11) and the second cylinder module (12) each comprise two cylinders (16) arranged side by side, and the piston connecting rods (161) in two adjacent cylinders (16) are connected via the first crankshaft (111) or the second crankshaft (121).

7. The range extender according to claim 6, characterized in that: Each oil cylinder (16) is provided with a spark plug (133).

8. A car, characterized in that: include: The range extender according to any one of claims 1 to 7.

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