A power system and a vehicle

Abstract

The application relates to the field of automobile power technology and discloses a power system and an automobile. The power system comprises a reduction shaft, a differential, a flywheel and a driving motor. The reduction shaft and the differential are located on the same side of the flywheel. The reduction shaft comprises a first section and a second section, the first section is connected with the second section, the driving motor and the flywheel are respectively connected with the first section in transmission, and the first section is farther away from the driving motor than the second section. The differential comprises a first output gear and a housing, the first output gear is in transmission connection with the housing and the second section, one end of the housing is located in the normal projection of the flywheel on a first projection plane, and the first projection plane is a plane perpendicular to the length direction of the housing. The power system disclosed by the application arranges one end of the housing of the differential on the position where the first projection plane coincides with the flywheel, so that the difference between the lengths of the two ends of the housing and the wheels is reduced, that is, the lengths of the two half shafts are close to each other, and abnormal noise and vibration generated during the work of the half shafts are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automobile power technology, and in particular relates to a power system and an automobile. BACKGROUND

[0002] An automobile is a common means of transportation.

[0003] The automobile generally comprises a power source and an output mechanism, and the power source can output power to the output mechanism.

[0004] In the related art, when the power source outputs power to the output mechanism, a plurality of transmission components are required, which can cause the NVH performance (Noise, Vibration, Harshness, noise, vibration and harshness) and the steering stability of the automobile to decrease. SUMMARY

[0005] In view of this, the present application provides a power system and an automobile to improve the NVH performance and the steering stability.

[0006] Specifically, the technical scheme comprises the following:

[0007] A first aspect of the present application provides a power system, comprising a reduction shaft, a differential, a flywheel and a driving motor, wherein

[0008] The reduction shaft and the differential are located on the same side of the flywheel.

[0009] The reduction shaft comprises a first segment and a second segment, the first segment is connected with the second segment, the driving motor and the flywheel are respectively connected in transmission with the first segment, and the first segment is farther away from the driving motor than the second segment.

[0010] The differential comprises a first output gear and a housing, the first output gear is in transmission connection with the housing and the second segment, one end of the housing is located within the flywheel in the orthographic projection of a first projection plane, and the first projection plane is a plane perpendicular to the length direction of the housing.

[0011] Optionally, the first segment has a first reduction gear, the second segment has a second reduction gear, the first reduction gear is respectively connected in transmission with the driving motor and the flywheel, and the second reduction gear is in meshing with the first output gear.

[0012] Optionally, the driving motor comprises a first input shaft and a first input gear, the first input gear is sleeved on the first input shaft and is connected in transmission with the first input shaft, and the first input gear is in meshing with the first reduction gear.

[0013] Optionally, the first input shaft has a bearing, the bearing is sleeved on the first input shaft, the bearing is separated from the flywheel in the orthographic projection of a second projection plane, the second projection plane is a plane perpendicular to the width direction of the housing.

[0014] Optionally, the power system comprises a second input shaft and a second input gear, the second input gear and the flywheel are both sleeved on the second input shaft and are in driving connection with the second input shaft, and the second input gear is in meshing connection with the second reduction gear.

[0015] Optionally, the power system comprises a generator, and the generator is in driving connection with the second input shaft.

[0016] Optionally, the generator has a second output gear, the power system comprises a third input gear, the third input gear is sleeved on the second input shaft and is in driving connection with the second input shaft, and the third input gear is in meshing connection with the second output gear.

[0017] Optionally, the power system comprises a clutch, the second input gear can rotate relative to the second input shaft, the second input shaft can drive the third input gear to rotate, and the clutch connects the second input gear and the third input gear.

[0018] Optionally, the flywheel in the orthographic projection of a third projection plane partially overlaps the reduction shaft in the orthographic projection of the third projection plane, and the third projection plane is a plane perpendicular to the width direction of the housing.

[0019] The second aspect of the application provides an automobile, which comprises the power system according to the above technical solution.

[0020] The technical solution provided by the embodiments of the application has at least the following beneficial effects: the reduction shaft can process the power from the driving motor, increase the torque and slow down the rotation speed, and adapt the power to the working condition of the differential. The reduction shaft is connected to the driving motor through the first section and connected to the housing of the differential through the second section, which is beneficial to disperse the weight of the power system of the application and improve the balance, thereby reducing the situation of abnormal sound and vibration when the power system is loaded on the automobile, and improving the NVH performance and steering stability. The housing has one end in the orthographic projection of the first projection plane located in the orthographic projection of the flywheel in the first projection plane, which is beneficial to make the distance between the two ends of the housing in the width direction close to the wheel, thereby improving the NVH performance and steering stability. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0022] Figure 1 A structural schematic diagram of a power system provided by an embodiment of the present application is shown in the figure.

[0023] Figure 2 A structural schematic diagram of another power system provided by an embodiment of the present application is shown in the figure.

[0024] Figure 3 A side view schematic diagram of a power system provided by an embodiment of the present application is shown in the figure.

[0025] Figure 4 A top view schematic diagram of a power system provided by an embodiment of the present application is shown in the figure.

[0026] The reference signs in the figures respectively represent:

[0027] 1, speed reduction shaft; 11, first section; 111, first speed reduction gear; 12, second section; 121, second speed reduction gear;

[0028] 2, differential; 21, first output gear; 22, housing;

[0029] 3, flywheel;

[0030] 4, drive motor; 41, first input shaft; 411, bearing; 42, first input gear;

[0031] 51, second input shaft; 52, second input gear; 53, third input gear;

[0032] 6, generator; 61, second output gear;

[0033] 7, clutch;

[0034] 8, half shaft;

[0035] 9, wheel.

[0036] Through the above drawings, the present application has shown explicit embodiments. There will be more detailed description hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application by any means, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0037] With reference to the drawings, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0038] The orientation terms such as "upper", "lower", "side" and the like involved in the embodiments of the present application are generally based on the relative relationship of the orientation shown in the drawings, and these orientation terms are used only to more clearly describe the structure and the relationship between the structures, and are not intended to describe absolute orientation. When the product is placed in different attitudes, the orientation may change, for example, "upper" and "lower" may be interchanged. Figure 1

[0039] Unless otherwise defined, all the technical terms used in the embodiments of the present application have the same meanings as commonly understood by those of ordinary skill in the art.

[0040] To make the technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0041] The first aspect of the present application provides a power system, as shown in the drawings, the power system comprises a reduction shaft 1, a differential 2, a flywheel 3 and a drive motor 4. Among them, Figure 1

[0042] The reduction shaft 1 and the differential 2 are located on the same side of the flywheel 3.

[0043] The reduction shaft 1 comprises a first section 11 and a second section 12, the first section 11 is connected with the second section 12, the drive motor 4 and the flywheel 3 are respectively connected in transmission with the first section 11, and the first section 11 is farther away from the drive motor 4 than the second section 12.

[0044] The differential 2 comprises a first output gear 21 and a housing 22, the first output gear 21 is in transmission connection with the housing 22 and the second section 12, one end of the housing 22 is located in the orthographic projection of the flywheel 3 in the first projection plane in the orthographic projection in the first projection plane, and the first projection plane is a plane perpendicular to the length direction of the housing 22.

[0045] ​​It can be understood that the reduction shaft 1 can process power from the driving motor 4, increase the torque and slow down the speed of the driving motor 4, and adapt the power to the working condition of the differential 2. The reduction shaft 1 is connected to the driving motor 4 through the first section 11 and connected to the housing 22 of the differential 2 through the second section 12, which is beneficial to disperse the weight of the power system of the application and improve the balance of the power system, thereby reducing the abnormal noise and vibration when the power system is loaded on the vehicle, and improving the NVH performance and handling stability. One end of the housing 22 is located in the front projection of the first projection plane within the front projection of the flywheel 3 in the first projection plane, which is beneficial to make the distance between the two ends of the housing 22 in the width direction and the wheels 9 close, thereby improving the NVH performance and handling stability.

[0046] In the embodiment of the application, the width direction of the housing 22 refers to the direction connected to the two ends of the housing 22 connected to the two half shafts 8 respectively.

[0047] In the embodiment of the application, the length direction of the housing 22 refers to the direction perpendicular to the width direction of the housing 22 and extending in the horizontal direction.

[0048] In the related art, the transmission is generally not on the center line of the vehicle, but is biased to one side of the vehicle body. Therefore, the two half shafts 8 of the vehicle are not equal in length. Such unequal length half shaft 8 structure is prone to abnormal noise and vibration during normal operation, which not only shortens the service life of the power system, but also affects the handling stability of the driver.

[0049] The power system of the application reduces the difference between the lengths of the two ends of the housing 22 and the wheels 9 by arranging one end of the housing 22 of the differential 2 at a position where the first projection plane coincides with the flywheel 3, that is, it is beneficial to make the lengths of the two half shafts 8 close, thereby reducing abnormal noise and vibration during operation.

[0050] In the embodiment of the application, the power system further comprises an engine, and the reduction shaft 1 and the differential 2 are located on the same side of the flywheel 3.

[0051] In this way, the driving motor 4 and the engine can be arranged on both sides of the flywheel 3 to disperse the weight of the power system and reduce abnormal noise and vibration caused by uneven weight distribution.

[0052] Wherein, the flywheel 3 can be approximated as a cylinder with a diameter greater than the height, the height direction of the flywheel 3 is parallel to the rotation axis of the flywheel 3, and the same side of the flywheel 3 can refer to the side of the flywheel 3 with the bottom surface facing it.

[0053] In the embodiment of the application, the first section 11 is connected to the second section 12.

[0054] The first section 11 and the second section 12 can be connected by an integrated process, such as casting, to transmit power from the engine and the drive motor 4. Alternatively, the first section 11 and the second section 12 can be connected by a key connection to transmit power from the engine and the drive motor 4. The integrated process can also be welding or extrusion molding.

[0055] In the embodiment of the application, the drive motor 4 and the flywheel 3 are respectively connected in transmission with the first section 11.

[0056] The drive motor 4 can be directly connected in transmission with the first section 11 to drive the first section 11, or the drive motor 4 can be connected in transmission with the first section 11 through an intermediate component to drive the first section 11.

[0057] The flywheel 3 and the first section 11 can be driven by the same power source. Alternatively, the flywheel 3 and the first section 11 can be driven by the power source in an alternative manner.

[0058] The power source can be an engine.

[0059] In the embodiment of the application, the first section 11 is farther away from the drive motor 4 than the second section 12.

[0060] The first section 11 and the second section 12 are arranged in sequence in the axial direction of the reduction shaft 1, and the second section 12 is located between the first section 11 and the drive motor 4.

[0061] The first section 11 is connected in transmission with the drive motor 4, and the second section 12 is connected in transmission with the housing 22. In this way, the differential 2 can be arranged to be away from the flywheel 3 to some extent, and the overall weight of the power system of the application can be dispersed.

[0062] In the embodiment of the application, the housing 22 of the differential 2 can be used to transmit torque from the first output gear 21, and can also be used to support and accommodate other components of the differential 2, such as the driving gear, the driven gear and the planetary gear.

[0063] In the embodiment of the application, the first output gear 21 is connected in transmission with the housing 22 and the second section 12.

[0064] The first output gear 21 can drive the housing 22 to rotate through the second section 12, so as to be connected in transmission with the housing 22 and the second section 12.

[0065] The first output gear 21 can be sleeved on the outside of the housing 22 and connected in transmission by a fixed connection. The fixed connection can be a bolt connection.

[0066] The first output gear 21 and the second section 12 can be connected in transmission in a permanent meshing manner.

[0067] In the embodiment of the present application, one end of the housing 22 is located within the projection of the flywheel 3 on the first projection plane.

[0068] The axis of the housing 22 and the axis of the wheel 9 need to be collinear, but due to process errors and other factors, there will be a certain error in the height direction, which reduces the NVH performance and steering stability. Specifically, the error will affect the arrangement of the half shaft 8 connecting the housing 22 and the wheel 9, that is, the non-collinear housing 22 and the wheel 9 will make the half shaft 8 in an inclined state, which is not conducive to the transmission of the torque of the housing 22 by the half shaft 8. The wheels 9 are generally distributed on both sides of the flywheel 3. The projection of one end of the housing 22 on the first projection plane is located within the projection of the flywheel 3 on the first projection plane, which is conducive to increasing the distance between the housing 22 and the wheel 9 located on the side of the differential 2, which is conducive to reducing the angle of inclination of the half shaft 8 and making the half shaft 8 transmit the torque of the housing 22, thereby improving the NVH performance and steering stability.

[0069] Exemplarily, the width of the housing 22 can be 150 to 170 mm. The width of the housing 22 can be 150 mm, 155 mm, 160 mm, 165 mm or 170 mm, or other values within the range of 150 to 170 mm.

[0070] The side of the flywheel 3 facing the engine is the variator end face, that is, the face where the engine and the transmission are combined. The variator end face is generally the coordinate origin of the power system under the whole vehicle. This is conducive to shortening the difference between the two half shafts 8 to improve the NVH performance.

[0071] Since the housing 22 is connected to the half shaft 8, and the connected position is supported by the bearing 411, one end of the housing 22 can refer to the part of the housing 22 on which the bearing 411 is sleeved.

[0072] In the embodiment of the present application, the width direction of the engine is parallel to the axial direction of the reduction shaft 1. Specifically, the cylinder arrangement direction of the engine is parallel to the axial direction of the reduction shaft 1.

[0073] In the embodiment of the present application, the differential 2 is used to adjust the torque obtained by the two half shafts 8, so that the turning and escape of the automobile can be realized. Exemplarily, the differential 2 is an open differential 2.

[0074] In some embodiments of the present application, as shown inFigure 2 As shown in the drawings, the first section 11 is provided with a first reduction gear 111, and the second section 12 is provided with a second reduction gear 121, the first reduction gear 111 is in transmission connection with the driving motor 4 and the flywheel 3 respectively, and the second reduction gear 121 is in meshing connection with the first output gear 21.

[0075] In the embodiment of the present application, the second reduction gear 121 is in meshing connection with the first output gear 21, which is beneficial for the second section 12 to drive the shell 22 to rotate through the second reduction gear 121, and to transmit the torque of the second section 12, so that the differential 2 can work normally. At the same time, the second reduction gear 121 can reduce the rotating speed of the second section 12 transmitted to the differential 2 by being in meshing connection with the first output gear 21, so as to increase the torque obtained by the differential 2, and drive the wheels 9 and the half shafts 8 to rotate.

[0076] In the embodiment of the present application, the driving motor 4 can be in transmission connection with the first reduction gear 111 through meshing, key connection or the like, and drive the first reduction gear 111 to rotate, or be in transmission connection with the first reduction gear 111 through an intermediate part, and drive the first reduction gear 111 to rotate.

[0077] In the embodiment of the present application, the first reduction gear 111 is in transmission connection with the flywheel 3 through an intermediate part, and the flywheel 3 generally drives the first reduction gear 111 to rotate indirectly by driving the intermediate part to rotate.

[0078] In the embodiment of the present application, the first reduction gear 111 can be connected with the first section 11 through an integral molding process, or be connected with the first section 11 through a key connection. Exemplarily, the integral molding process can also be welding or extrusion molding.

[0079] In the embodiment of the present application, the second reduction gear 121 can be connected with the second section 12 through an integral molding process, or be connected with the second section 12 through a key connection. Exemplarily, the integral molding process can also be welding or extrusion molding.

[0080] In some embodiments of the present application, as shown in the drawings, Figure 2 The driving motor 4 includes a first input shaft 41 and a first input gear 42, the first input gear 42 is sleeved on the first input shaft 41 and in transmission connection with the first input shaft 41, and in meshing connection with the first reduction gear 111.

[0081] In the embodiment of the present application, the driving motor 4 is in meshing connection with the first reduction gear 111 through the first input gear 42, which can realize the transmission connection with the first section 11, and drive the first reduction gear 111 and the first section 11 to rotate by driving the first input gear 42 to rotate, so as to drive the differential 2 to work.

[0082] In the embodiments of the present application, the first input gear 42 can be connected with the first input shaft 41 through an integrated process, or can be connected with the first input shaft 41 through a key connection. The integrated process can be casting, welding or extrusion molding.

[0083] In the embodiments of the present application, the first input shaft 41 can be used as a rotor shaft of the driving motor 4. The driving motor 4 drives the first input shaft 41 to rotate through a magnetic field formed by a stator. The driving motor 4 can also be connected with the first input shaft 41 through a rotor shaft to drive the first input shaft 41 to rotate. The rotor shaft and the first input shaft 41 can be connected through a spline connection or the like.

[0084] In some embodiments of the present application, as shown in Figure 3 The first input shaft 41 has a bearing 411, which is sleeved on the first input shaft 41. The bearing 411 is separated from the flywheel 3 in the second projection plane. The second projection plane is a plane perpendicular to the length direction of the housing 22.

[0085] In the embodiments of the present application, the bearing 411 is separated from the flywheel 3 in the second projection plane. This is beneficial to the driving motor 4 to overlap with the flywheel 3 and the engine in the width direction of the power system of the present application. In this way, the width of the power system of the present application can be shortened.

[0086] In the embodiments of the present application, the width direction of the power system is consistent with the width direction of the housing 22.

[0087] In the embodiments of the present application, the bearing 411 can support the first input shaft 41 to rotate. The inner ring of the bearing 411 is connected with the first input shaft 41, and the outer ring of the bearing 411 can be connected with other components. In this way, the first input shaft 41 can be driven to rotate by the driving motor 4.

[0088] In some embodiments of the present application, as shown in Figure 4 The power system includes a second input shaft 51 and a second input gear 52. The second input gear 52 and the flywheel 3 are sleeved on the second input shaft 51 and are connected with the second input shaft 51 in transmission. The second input gear 52 is engaged with the second reduction gear 121.

[0089] In the embodiments of the present application, the flywheel 3 is connected with the second input shaft 51 in transmission, and can drive the second input shaft 51 to rotate. In this way, the engine can be started through the second input shaft 51.

[0090] In the embodiment of the present application, the second input shaft 51 is engaged with the second reduction gear 121 through the second input gear 52, and can drive the second reduction gear 121 to rotate, and drive the differential 2 to rotate. The second reduction gear 121 can also reduce the rotating speed of the second section 12 transmitted to the differential 2, so as to increase the torque obtained by the differential 2, and drive the wheels 9 and the half shafts 8 to rotate.

[0091] In the embodiment of the present application, the second input shaft 51 can be a crankshaft of the engine, and is driven to rotate by the pistons, or can be connected to the crankshaft through a coupling or the like to be driven by the pistons.

[0092] In the embodiment of the present application, the second input shaft 51 and the second input gear 52 can be connected through an integrated forming process, such as casting, or can be connected through a key connection to transmit power from the engine. The integrated forming process can also be welding or extrusion forming.

[0093] In some embodiments of the present application, as shown in Figure 4 The power system includes a generator 6 connected in transmission with the second input shaft 51.

[0094] In the embodiment of the present application, the second input shaft 51 is connected in transmission with the generator 6, which is beneficial to output kinetic energy from the second input shaft 51 to the generator 6, so that the generator 6 can generate electricity to supply other components.

[0095] In the embodiment of the present application, the generator 6 can be directly connected in transmission with the second input shaft 51 through a key, a coupling or the like, and is driven to rotate by the second input shaft 51 to generate electricity. The generator 6 can also be connected in transmission with the second input shaft 51 through an intermediate component, and is driven to rotate by the second input shaft 51 to generate electricity.

[0096] In the embodiment of the present application, the generator 6 can be electrically connected with the drive motor 4, and the generated electricity can be directly applied to the drive motor 4, so that the drive motor 4 can drive the differential 2 to work.

[0097] In the embodiment of the present application, the electricity generated by the generator 6 can also be stored in a power source for other components to take electricity when working.

[0098] In some embodiments of the present application, as shown in Figure 4 The generator 6 has a second output gear 61, and the power system includes a third input gear 53 sleeved on the second input shaft 51 and connected in transmission with the second input shaft 51, and the third input gear 53 is engaged with the second output gear 61.

[0099] In the embodiment of the application, the second input shaft 51 can drive the generator 6 to rotate by engaging the third input gear 53 with the second output gear 61, so as to facilitate the generator 6 to convert kinetic energy into electric energy.

[0100] In the embodiment of the application, the third input gear 53 can be connected with the first section 11 by an integral forming process, or can be connected with the second input shaft 51 by a key connection. The integral forming process can also be welding or extrusion forming.

[0101] In the embodiment of the application, the number of teeth of the third input gear 53 is more than the number of teeth of the second output gear 61, so as to increase the kinetic energy obtained by the generator 6, thereby improving the power generation efficiency.

[0102] In some embodiments of the application, as shown in Figure 4 The power system includes a clutch 7, the second input gear 52 can rotate relative to the second input shaft 51, the second input shaft 51 can drive the third input gear 53 to rotate, and the clutch 7 connects the second input gear 52 and the third input gear 53.

[0103] In the embodiment of the application, since the generator 6 is drivingly connected with the second input shaft 51, the generator 6 will occupy the power output by the second input shaft 51 when generating electricity. At the same time, even if the generator 6 is not in a working state, if the second input shaft 51 still drives the second output gear 61 to rotate, the output efficiency of the second input shaft 51 will be reduced. By connecting the second input gear 52 and the third input gear 53 through the clutch 7, the power system of the application can select to drive the generator 6 or simultaneously drive the generator 6 and the second input shaft 51 to work according to the actual needs, so as to improve the output efficiency of the second input shaft 51.

[0104] When the clutch 7 is disconnected, the transmission connection between the second input gear 52 and the third input gear 53 is disconnected, the second input shaft 51 can drive the third input gear 53 to rotate and rotate relative to the second input gear 52, at this time the generator 6 converts the kinetic energy into electric energy, and the reduction shaft 1 cannot be driven by the second input shaft 51 to rotate.

[0105] When the clutch 7 is closed, the transmission connection between the second input gear 52 and the third input gear 53 is closed, the second input shaft 51 can drive the second input gear 52 and the third input gear 53 to rotate, at this time the generator 6 converts the kinetic energy into electric energy, and the reduction shaft 1 is driven by the second input shaft 51 to rotate.

[0106] In the embodiment of the application, the second input gear 52 is sleeved on the second input shaft 51, and a bearing can be arranged between the second input shaft 51 and the second input gear 52 to enable the relative rotation of the second input shaft 51 and the second input gear 52. The inner ring of the bearing is connected with the second input shaft 51, and the outer ring of the bearing is connected with the second input gear 52, so that the second input shaft 51 can support the second input gear 52 and provide the relative rotation between the second input shaft 51 and the second input gear 52.

[0107] In the embodiment of the application, the clutch 7 can be an electromagnetic clutch, a magnetic powder clutch or a hydraulic clutch, or can be another type of clutch.

[0108] In some embodiments of the application, as shown in Figure 3 The orthogonal projection of the flywheel 3 in the third projection plane partially overlaps the orthogonal projection of the reduction shaft 1 in the third projection plane, and the third projection plane is a plane perpendicular to the length direction of the housing 22.

[0109] In the embodiment of the application, the reduction shaft 1 is generally connected in transmission with the driving motor 4 and the flywheel 3 through the gears on the reduction shaft 1, so the end of the reduction shaft 1 generally does not have other transmission components. The orthogonal projection of the flywheel 3 in the third projection plane partially overlaps the orthogonal projection of the reduction shaft 1 in the third projection plane, which does not cause interference between the flywheel 3 and the reduction shaft 1, and is also conducive to improving the compactness of the power system of the application.

[0110] The second aspect of the application provides an automobile, which comprises the power system according to the above-mentioned embodiments.

[0111] It can be understood that, due to the power system according to the above-mentioned embodiments, the automobile of the application has the same technical effects as the above-mentioned embodiments, which will not be described herein.

[0112] In the application, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. The term "a plurality of" refers to two or more, unless otherwise explicitly limited.

[0113] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. The application is intended to cover any variations, uses or adaptive changes of the application following the general principles of the application and including those falling within the prior art concepts or customary technical practices not disclosed in the application. The specification and examples are only considered as exemplary.

[0114] It should be understood that the application is not limited to the precise construction that has been described above and shown in the accompanying drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the application is limited only by the claims appended hereto.

Claims

1. A power system, characterized by, The power system comprises a reduction shaft (1), a differential (2), a flywheel (3) and a drive motor (4), wherein, The reduction shaft (1) and the differential (2) are located on the same side of the flywheel (3); The reduction shaft (1) comprises a first section (11) and a second section (12), the first section (11) is connected with the second section (12), the drive motor (4) and the flywheel (3) are respectively connected in transmission with the first section (11), and the first section (11) is farther away from the drive motor (4) than the second section (12). The differential (2) comprises a first output gear (21) and a housing (22), the first output gear (21) is connected in transmission with the housing (22) and the second section (12), and one end of the housing (22) is located in the orthogonal projection of the flywheel (3) on a first projection plane.

2. The power system of claim 1, wherein, The first section (11) has a first reduction gear (111), the second section (12) has a second reduction gear (121), the first reduction gear (111) is connected in transmission with the drive motor (4) and the flywheel (3) respectively, and the second reduction gear (121) is engaged with the first output gear (21).

3. The power system of claim 2, wherein, The drive motor (4) comprises a first input shaft (41) and a first input gear (42), the first input gear (42) is sleeved on the first input shaft (41) and connected in transmission with the first input shaft (41), and the first input gear (42) is engaged with the first reduction gear (111).

4. The power system of claim 3, wherein, The first input shaft (41) has a bearing (411), the bearing (411) is sleeved on the first input shaft (41), and the orthogonal projection of the bearing (411) on a second projection plane is separated from the orthogonal projection of the flywheel (3) on the second projection plane, and the second projection plane is a plane perpendicular to the width direction of the housing (22).

5. The power system of claim 2, wherein, The power system comprises a second input shaft (51) and a second input gear (52), the second input gear (52) and the flywheel (3) are both sleeved on the second input shaft (51) and connected in transmission with the second input shaft (51), and the second input gear (52) is engaged with the second reduction gear (121).

6. The power system of claim 5, wherein, The power system comprises a generator (6), and the generator (6) is connected in transmission with the second input shaft (51).

7. The power system of claim 6, wherein, The generator (6) has a second output gear (61), the power system comprises a third input gear (53), the third input gear (53) is sleeved on the second input shaft (51) and connected in transmission with the second input shaft (51), and the third input gear (53) is engaged with the second output gear (61).

8. The power system of claim 7, wherein, The power system comprises a clutch (7), the second input gear (52) can rotate relative to the second input shaft (51), the second input shaft (51) can drive the third input gear (53) to rotate, the clutch (7) connects the second input gear (52) and the third input gear (53).

9. The power system of claim 1, wherein, The front projection of the flywheel (3) in a third projection plane partially coincides with the front projection of the reduction shaft (1) in the third projection plane, and the third projection plane is a plane perpendicular to the width direction of the shell (22).

10. An automobile characterized by comprising: The automobile comprises the power system as claimed in any one of claims 1 to 9.

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