Power system and automobile

Abstract

The present application relates to the technical field of automobile power, and discloses a power system and an automobile. The power system comprises a reduction axle, a differential, a flywheel, and a driving motor. The reduction axle and the differential are located on the same side of the flywheel. The reduction axle comprises a first section and a second section, the first section is connected to the second section, the driving motor and the flywheel each are transmittingly connected to the first section, 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 transmittingly connected to the housing and the second section, the orthographic projection of one end of the housing on a first projection plane is located in the orthographic projection of the flywheel on the first projection plane, and the first projection plane is a plane perpendicular to the length direction of the housing. In the power system of the present application, by arranging one end of the housing of the differential at the position where the first projection plane coincides with the flywheel, the difference in distance between two ends of the housing and respective wheels is reduced, that is, the lengths of two half shafts are close, thus reducing abnormal noise and vibration generated during operating.

Description

A power system and automobile

[0001] This application claims priority to Chinese Patent Application No. 202410481928.X, filed on April 22, 2024, entitled "A Power System and a Motor Vehicle", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of automotive power technology, and in particular to a power system and an automobile. Background Technology

[0003] A car is a common means of transportation.

[0004] A car generally consists of a power source and an output mechanism, and the power source can output power to the output mechanism.

[0005] In related technologies, when the power source outputs power to the output mechanism, it needs to pass through numerous transmission components, which will reduce the vehicle's NVH performance (Noise, Vibration, Harshness) and handling stability.

[0006] Summary of the Invention

[0007] This application provides a powertrain system and a vehicle to improve their NVH performance and handling stability. The technical solution is as follows:

[0008] In one aspect, this application provides a power system comprising a reduction shaft, a differential, a flywheel, and a drive motor. Wherein,

[0009] The reduction shaft and the differential are located on the same side of the flywheel.

[0010] The reduction shaft includes a first section and a second section, the first section is connected to the second section, the drive motor and the flywheel are respectively connected to the first section for transmission, and the first section is farther away from the drive motor than the second section.

[0011] The differential includes a first output gear and a housing. The first output gear drives the housing and the second segment. One end of the housing is projected onto a first projection plane, which is located within the projection of the flywheel onto the first projection plane. The first projection plane is a plane perpendicular to the length direction of the housing.

[0012] Optionally, the first segment has a first reduction gear, the second segment has a second reduction gear, the first reduction gear is connected to the drive motor and the flywheel respectively, and the second reduction gear meshes with the first output gear.

[0013] Optionally, the drive motor includes a first input shaft and a first input gear, the first input gear being sleeved on the first input shaft and connected to the first input shaft in a driving connection, and the first input gear meshing with the first reduction gear.

[0014] Optionally, the first input shaft has a bearing, the bearing is sleeved on the first input shaft, and the orthographic projection of the bearing on the second projection plane is separated from the orthographic projection of the flywheel on the second projection plane, the second projection plane being a plane perpendicular to the width direction of the housing.

[0015] Optionally, the power system includes 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 connected to the second input shaft for transmission, and the second input gear meshes with the second reduction gear.

[0016] Optionally, the power system includes a generator, which is connected to the second input shaft via a drive.

[0017] Optionally, the generator has a second output gear, and the power system includes a third input gear, which is sleeved on the second input shaft and is connected to the second input shaft in a driving connection, and the third input gear meshes with the second output gear.

[0018] Optionally, the power system includes a clutch, the second input gear being rotatable relative to the second input shaft, the second input shaft being capable of driving the third input gear to rotate, and the clutch connecting the second input gear and the third input gear.

[0019] Optionally, the orthographic projection of the flywheel onto the third projection plane partially coincides with the orthographic projection of the reduction shaft onto the third projection plane, wherein the third projection plane is a plane perpendicular to the width direction of the housing.

[0020] On the other hand, embodiments of this application provide a vehicle, the vehicle including a powertrain system, the powertrain system including a reduction shaft, a differential, a flywheel, and a drive motor. Wherein,

[0021] The reduction shaft and the differential are located on the same side of the flywheel.

[0022] The reduction shaft includes a first section and a second section, the first section is connected to the second section, the drive motor and the flywheel are respectively connected to the first section for transmission, and the first section is farther away from the drive motor than the second section.

[0023] The differential includes a first output gear and a housing. The first output gear drives the housing and the second segment. One end of the housing is projected onto a first projection plane, which is located within the projection of the flywheel onto the first projection plane. The first projection plane is a plane perpendicular to the length direction of the housing.

[0024] Optionally, the first segment has a first reduction gear, the second segment has a second reduction gear, the first reduction gear is connected to the drive motor and the flywheel respectively, and the second reduction gear meshes with the first output gear.

[0025] Optionally, the drive motor includes a first input shaft and a first input gear, the first input gear being sleeved on the first input shaft and connected to the first input shaft in a driving connection, and the first input gear meshing with the first reduction gear.

[0026] Optionally, the first input shaft has a bearing, the bearing is sleeved on the first input shaft, and the orthographic projection of the bearing on the second projection plane is separated from the orthographic projection of the flywheel on the second projection plane, the second projection plane being a plane perpendicular to the width direction of the housing.

[0027] Optionally, the power system includes 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 connected to the second input shaft for transmission, and the second input gear meshes with the second reduction gear.

[0028] Optionally, the power system includes a generator, which is connected to the second input shaft via a drive.

[0029] The beneficial effects of the technical solution provided in this application include at least the following: the reduction shaft can handle the power from the drive motor, thereby increasing its torque and reducing its speed, making the power compatible with the working conditions of the differential. The reduction shaft is connected to the drive motor via a first section and to the differential housing via a second section, which helps to distribute the weight of the power system of this application, improving its balance and reducing abnormal noise and vibration when mounted on a vehicle, thus improving its NVH performance and handling stability. One end of the housing is projected onto the first projection plane within the projection of the flywheel onto the first projection plane, which helps to make the distances between the two ends of the housing in the width direction and the wheels similar, thereby improving its NVH performance and handling stability. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 is a schematic diagram of a power system provided in an embodiment of this application;

[0032] Figure 2 is a schematic diagram of another power system provided in an embodiment of this application;

[0033] Figure 3 is a side view schematic diagram of a power system provided in an embodiment of this application;

[0034] Figure 4 is a top view schematic diagram of a power system provided in an embodiment of this application.

[0035] The reference numerals in the figure are respectively:

[0036] 1. Reduction shaft; 11. First section; 111. First reduction gear; 12. Second section; 121. Second reduction gear;

[0037] 2. Differential; 21. First output gear; 22. Housing;

[0038] 3. Flywheel;

[0039] 4. Drive motor; 41. First input shaft; 411. Bearing; 42. First input gear;

[0040] 51. Second input shaft; 52. Second input gear; 53. Third input gear;

[0041] 6. Generator; 61. Second output gear;

[0042] 7. Clutch;

[0043] 8. Half-shaft;

[0044] 9. Wheels. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0046] Unless otherwise defined, all technical terms used in the embodiments of this application have the same meaning as commonly understood by those skilled in the art.

[0047] To make the technical solutions and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0048] The first aspect of this application provides a power system, as shown in Figure 1, which includes a reduction shaft 1, a differential 2, a flywheel 3, and a drive motor 4.

[0049] The reduction shaft 1 and the differential 2 are located on the same side of the flywheel 3.

[0050] The reduction shaft 1 includes a first section 11 and a second section 12. The first section 11 is connected to the second section 12. The drive motor 4 and the flywheel 3 are respectively connected to the first section 11. The first section 11 is farther away from the drive motor 4 than the second section 12.

[0051] The differential 2 includes a first output gear 21 and a housing 22. The first output gear 21 is connected to the housing 22 and the second section 12. One end of the housing 22 is projected onto the first projection plane and is located within the projection of the flywheel 3 onto the first projection plane. The first projection plane is a plane perpendicular to the length direction of the housing 22.

[0052] Understandably, the reduction shaft 1 can handle the power from the drive motor 4, increasing its torque and reducing its speed to adapt the power to the operating conditions of the differential 2. The reduction shaft 1 is connected to the drive motor 4 via the first section 11 and to the housing 22 of the differential 2 via the second section 12. This helps to distribute the weight of the power system, improving its balance and reducing abnormal noise and vibration when mounted on a vehicle, thus improving its NVH performance and handling stability. One end of the housing 22 is projected onto the first projection plane within the projection of the flywheel 3 onto the first projection plane, which helps to make the two ends of the housing 22 in the width direction close to the distances of the wheels 9, thereby improving its NVH performance and handling stability.

[0053] In this embodiment, the width direction of the housing 22 refers to the direction in which it is connected to the two ends of the two half-shafts 8 respectively.

[0054] In this embodiment, the length direction of the housing 22 refers to the direction that is perpendicular to the width direction of the housing 22 and extends in the horizontal direction.

[0055] In related technologies, the transmission is generally not located on the centerline of the car, but rather off-center to one side of the vehicle. Therefore, the two half-shafts are not of equal length. This unequal-length half-shaft structure is prone to generating abnormal noise and vibration during normal operation, which can shorten the service life of the powertrain and affect the driver's handling stability.

[0056] The power system of this application reduces the difference in length between the two ends of the housing 22 and the wheel 9 by arranging one end of the differential 2 housing 2 at a position where the first projection plane coincides with the flywheel 3. This makes it easier for the lengths of the two half-shafts 8 to be close, thereby reducing abnormal noise and vibration during operation.

[0057] In this embodiment, the power system also includes an engine, and the reduction shaft 1 and the differential 2 are located on the same side of the flywheel 3.

[0058] This allows the drive motor 4 and the engine to be positioned on both sides of the flywheel 3, thereby distributing the weight of the power system and reducing abnormal noise and vibration caused by uneven weight distribution.

[0059] Among them, the flywheel 3 can be approximated as a cylinder with a diameter greater than its height. The height direction of the flywheel 3 is parallel to its rotation axis. The same side of the flywheel 3 can refer to the side where the bottom surface of the flywheel 3 faces.

[0060] In this embodiment of the application, the first segment 11 is connected to the second segment 12.

[0061] The first segment 11 and the second segment 12 can be connected by an integral molding process, such as casting, to transmit power from the engine and drive motor 4. Alternatively, they can be connected by a key or other means to transmit power from the engine and drive motor 4. For example, the integral molding process can also be welding or extrusion molding.

[0062] In this embodiment, the drive motor 4 and the flywheel 3 are respectively connected to the first segment 11 via transmission.

[0063] The drive motor 4 can be directly connected to the first segment 11 to drive the first segment 11 to work, or it can be connected to the first segment 11 through an intermediate component to drive the first segment 11 to work.

[0064] The flywheel 3 is connected to the first segment 11 via a transmission, meaning that both operate under the drive of the same power source. For example, the flywheel 3 and the first segment 11 can be driven simultaneously by the same power source, or they can be driven by the power source in a selective manner.

[0065] For example, the power source can be an engine.

[0066] In this embodiment of the application, the first segment 11 is farther away from the drive motor 4 than the second segment 12.

[0067] The first segment 11 is arranged sequentially in the axial direction of the reduction shaft 1 than the second segment 12, and the second segment 12 is located between the first segment 11 and the drive motor 4.

[0068] The first segment 11 is connected to the drive motor 4, and the second segment 12 is connected to the housing 22. This arrangement allows the differential 2 to be moved away from the flywheel 3 to a certain extent, thus dispersing the overall weight of the power system of this application.

[0069] In this embodiment, the housing 22 of the differential 2 can be used to transmit torque from the first output gear 21, and also to support and accommodate other components of the differential 2, such as the drive gear, driven gear, and planetary gears. Exemplarily, the housing 22 can accommodate these other components by forming a central control structure.

[0070] In this embodiment, the first output gear 21 drives the housing 22 and the second segment 12.

[0071] The first output gear 21 can drive the housing 22 to rotate through the second section 12, thereby realizing the transmission connection between the housing 22 and the second section 12.

[0072] The first output gear 21 can be sleeved on the outside of the housing 22, and the transmission connection between the gear and the housing 22 is achieved by a fixed connection. The fixed connection can be a bolt connection.

[0073] The first output gear 21 and the second segment 12 can be permanently meshed to achieve a transmission connection.

[0074] In this embodiment of the application, the orthographic projection of one end of the housing 22 onto the first projection plane is located within the orthographic projection of the flywheel 3 onto the first projection plane.

[0075] The axis of the housing 22 and the axis of the wheel 9 need to be collinear. However, due to manufacturing errors and other factors, there will be a certain error in their height direction. This error reduces NVH performance and handling stability. Specifically, this error affects the arrangement of the half-shaft 8 connecting the housing 22 and the wheel 9. That is, the non-collinear housing 22 and wheel 9 will cause the half-shaft 8 to be tilted, which is not conducive to the transmission of torque from the housing 22 by the half-shaft 8. The wheels 9 are generally distributed on both sides of the flywheel 3. Setting one end of the housing 22 so that its orthographic projection on the first projection plane is located within the orthographic projection of the flywheel 3 on the first projection plane helps to increase the distance between the housing 22 and the wheel 9 located on the side of the differential 2. This helps to reduce the tilt angle of the half-shaft 8, thereby enabling the half-shaft 8 to transmit torque from the housing 22, thus improving NVH performance and reducing the decrease in handling stability.

[0076] For example, the width of the housing 22 can be in the range of 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 ​​in the range of 150 to 170 mm.

[0077] The side of the flywheel 3 facing the engine is the engine-transformer end face, which is the surface where the engine and transmission meet. The engine-transformer end face is generally the coordinate origin of the powertrain under the vehicle. This helps to shorten the difference between the two half-shafts 8, thereby improving its NVH performance.

[0078] Since the housing 22 is connected to the half shaft 8, and the connection 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 fitted.

[0079] In this embodiment, 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.

[0080] In this embodiment, the differential 2 is used to adjust the torque obtained by the two half-shafts 8, thereby enabling the vehicle to turn and get out of trouble. Exemplarily, the differential 2 is an open differential 2.

[0081] In some embodiments of this application, as shown in FIG2, the first segment 11 has a first reduction gear 111, the second segment 12 has a second reduction gear 121, the first reduction gear 111 is connected to the drive motor 4 and the flywheel 3 respectively, and the second reduction gear 121 meshes with the first output gear 21.

[0082] In this embodiment, the second reduction gear 121 meshes with the first output gear 21, which facilitates the second segment 12 driving the housing 22 to rotate via the second reduction gear 121, thereby transmitting the torque of the second segment 12 and enabling the differential 2 to operate normally. Simultaneously, by meshing with the first output gear 21, the second reduction gear 121 reduces the rotational speed transmitted from the second segment 12 to the differential 2, thus increasing the torque received by the differential 2 and driving the wheels 9 and half-shaft 8 to rotate.

[0083] In this embodiment of the application, the drive motor 4 can be connected to the first reduction gear 111 by means of meshing, key connection or other means, and drive the first reduction gear 111 to rotate. Alternatively, it can be connected to the first reduction gear 111 by means of intermediate components, and drive the first reduction gear 111 to rotate.

[0084] In this embodiment, the first reduction gear 111 and the flywheel 3 are connected by an intermediate component for transmission. The flywheel 3 generally drives the first reduction gear 111 to rotate indirectly by driving the intermediate component to rotate.

[0085] In this embodiment, the first reduction gear 111 can be connected to the first segment 11 by an integral molding process or by a key connection. Exemplarily, the integral molding process can also be welding or extrusion molding.

[0086] In this embodiment, the second reduction gear 121 can be connected to the second segment 12 by an integral molding process or by a key connection. Exemplarily, the integral molding process can also be welding or extrusion molding.

[0087] In some embodiments of this application, as shown in FIG2, the drive 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 is connected to the first input shaft 41 in a transmission manner, and meshes with the first reduction gear 111.

[0088] In this embodiment of the application, the drive motor 4 meshes with the first reduction gear 111 through the first input gear 42, which can realize the transmission connection with the first segment 11. By driving the first input gear 42 to rotate, the first reduction gear 111 and the first segment 11 are driven to rotate, thereby driving the differential 2 to work.

[0089] In this embodiment, the first input gear 42 can be connected to the first input shaft 41 either by an integral molding process or by a key connection. The integral molding process can be casting, welding, or extrusion molding.

[0090] In this embodiment, the first input shaft 41 can serve as the rotor shaft of the drive motor 4. The drive motor 4 drives the first input shaft 41 to rotate via the magnetic field formed by the stator. Alternatively, the drive motor 4 can be connected to the first input shaft 41 via a rotor shaft, thereby driving the first input shaft 41 to rotate. The rotor shaft and the first input shaft 41 can be connected via a spline connection or similar method.

[0091] In some embodiments of this application, as shown in FIG3, the first input shaft 41 has a bearing 411, the bearing 411 is sleeved on the first input shaft 41, the orthographic projection of the bearing 411 on the second projection plane is separated from the orthographic projection of the flywheel 3 on the second projection plane, and the second projection plane is a plane perpendicular to the length direction of the housing 22.

[0092] In this embodiment, the orthographic projection of the bearing 411 on the second projection plane is separated from the orthographic projection of the flywheel 3 on the second projection plane. This facilitates the overlap between the drive motor 4 and the flywheel 3 and the engine in the width direction of the power system of this application, thereby shortening the width of the power system of this application.

[0093] In this embodiment, the width direction of the power system is consistent with the width direction of the housing 22.

[0094] In this embodiment of the application, the bearing 411 can support the rotation of the first input shaft 41. The inner ring of the bearing 411 is connected to the first input shaft 41, and the outer ring of the bearing 411 can be connected to other components, so as to realize the rotation of the first input shaft 41 under the drive of the drive motor 4.

[0095] In some embodiments of this application, as shown in FIG4, 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 both sleeved on the second input shaft 51 and are connected to the second input shaft 51 for transmission. The second input gear 52 meshes with the second reduction gear 121.

[0096] In this embodiment, the flywheel 3 is connected to the second input shaft 51 via a transmission, and can drive the second input shaft 51 to rotate, thus driving the engine to start via the second input shaft 51.

[0097] In this embodiment, the second input shaft 51 meshes with the second reduction gear 121 via the second input gear 52, which can drive the second reduction gear 121 to rotate, thereby driving the differential 2 to rotate. The second reduction gear 121 can also reduce the rotational speed transmitted to the differential 2 by the second segment 12, thus increasing the torque obtained by the differential 2, thereby driving the wheels 9 and half-shaft 8 to rotate.

[0098] In this embodiment, the second input shaft 51 can be used as the crankshaft of an engine, rotating under the drive of the piston, or it can be connected to the crankshaft through a coupling or other structure to achieve transmission and be driven by the piston.

[0099] In this embodiment, the second input shaft 51 and the second input gear 52 can be connected by an integral molding process, such as casting, to transmit power from the engine, or they can be connected by a key or other means to transmit power from the engine. The integral molding process can also be welding or extrusion molding.

[0100] In some embodiments of this application, as shown in FIG4, the power system includes a generator 6, which is connected to a second input shaft 51.

[0101] In this embodiment, the second input shaft 51 is connected to the generator 6 via a transmission, which facilitates the second input shaft 51 to output kinetic energy to the generator 6, enabling the generator 6 to generate electricity to power other components.

[0102] In this embodiment, the generator 6 can be directly connected to the second input shaft 51 via a key, coupling, or other structure for transmission, and rotates under the drive of the second input shaft 51 to generate electricity. Alternatively, the generator 6 can be connected to the second input shaft via an intermediate component, and rotate under the drive of the second input shaft 51 to generate electricity.

[0103] In this embodiment, the generator 6 can be electrically connected to the drive motor 4, and the electrical energy generated by the generator can be directly applied to the drive motor 4, so that the drive motor 4 can drive the differential 2 to work.

[0104] In this embodiment of the application, the electrical energy generated by the generator 6 can also be stored in the power supply so that other components can draw power when they are working.

[0105] In some embodiments of this application, as shown in FIG4, the generator 6 has a second output gear 61, and the power system includes a third input gear 53. The third input gear 53 is sleeved on the second input shaft 51 and is connected to the second input shaft 51 in a driving manner. The third input gear 53 meshes with the second output gear 61.

[0106] In this embodiment of the application, the second input shaft 51 can drive the generator 6 to rotate by meshing the third input gear 53 with the second output gear 61, which is beneficial for the generator 6 to convert kinetic energy into electrical energy.

[0107] In this embodiment, the third input gear 53 can be connected to the first segment 11 via an integral molding process, or it can be connected to the second input shaft 51 via a key connection. Exemplarily, the integral molding process can also be welding or extrusion molding.

[0108] In this embodiment, the third input gear 53 has more teeth than the second output gear 61, thereby increasing the kinetic energy obtained by the generator 6 and improving the power generation efficiency.

[0109] In some embodiments of this application, as shown in FIG4, the power system includes a clutch 7, a second input gear 52 is rotatable relative to a second input shaft 51, the second input shaft 51 is rotatable to drive a third input gear 53 to rotate, and the clutch 7 connects the second input gear 52 and the third input gear 53.

[0110] In this embodiment, since the generator 6 is connected to the second input shaft 51, the generator 6 consumes the power output from the second input shaft 51 when generating electricity. Furthermore, even when the generator 6 is not operating, if the second input shaft 51 still drives the second output gear 61, the output efficiency of the second input shaft 51 will be reduced. Connecting the second input gear 52 and the third input gear 53 via the clutch 7 is beneficial for the power system of this application. Depending on the actual needs, it allows for the selection of driving the generator 6 or simultaneously driving both the generator 6 and the second input shaft 51, thus improving the output efficiency of the second input shaft 51.

[0111] When the clutch 7 is disengaged, the transmission connection between the second input gear 52 and the third input gear 53 is broken. 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 of the rotation into electrical energy, while the reduction shaft 1 cannot be driven to rotate by the second input shaft 51.

[0112] When the clutch 7 is closed, the transmission connection between the second input gear 52 and the third input gear 53 is closed, and 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 of the rotation into electrical energy, and the reduction shaft 1 is driven to rotate by the second input shaft 51.

[0113] In this embodiment, the second input gear 52 is sleeved on the second input shaft 51, and a bearing can be provided between the two to allow relative rotation. The inner ring of the bearing is connected to the second input shaft 51, and the outer ring of the bearing is connected to the second input gear 52. This allows the second input shaft 51 to support the second input gear 52 while also providing conditions for relative rotation between them.

[0114] In the embodiments of this application, the clutch 7 can be an electromagnetic clutch, a magnetic powder clutch, or a hydraulic clutch, or other types of clutches.

[0115] In some embodiments of this application, as shown in FIG3, the orthographic projection of the flywheel 3 on the third projection plane partially coincides with the orthographic projection of the reduction shaft 1 on the third projection plane, and the third projection plane is a plane perpendicular to the length direction of the housing 22.

[0116] In this embodiment, the reduction shaft 1 is generally connected to the drive motor 4 and the flywheel 3 via gears on it, so there are generally no other transmission components at the end of the reduction shaft 1. Setting the orthographic projection of the flywheel 3 on the third projection plane to coincide with the orthographic projection of the reduction shaft 1 on the third projection plane will not cause interference between the flywheel 3 and the reduction shaft 1, and will also help improve the compactness of the power system of this application.

[0117] A second aspect of this application provides an automobile, which includes a powertrain system. The powertrain system includes a reduction shaft 1, a differential 2, a flywheel 3, and a drive motor 4. Wherein,

[0118] The reduction shaft 1 and the differential 2 are located on the same side of the flywheel 3.

[0119] The reduction shaft 1 includes a first section 11 and a second section 12. The first section 11 is connected to the second section 12. The drive motor 4 and the flywheel 3 are respectively connected to the first section 11. The first section 11 is farther away from the drive motor 4 than the second section 12.

[0120] The differential 2 includes a first output gear 21 and a housing 22. The first output gear 21 is connected to the housing 22 and the second section 12. One end of the housing 22 is projected onto the first projection plane and is located within the projection of the flywheel 3 onto the first projection plane. The first projection plane is a plane perpendicular to the length direction of the housing 22.

[0121] Understandably, the reduction shaft 1 can handle the power from the drive motor 4, increasing its torque and reducing its speed to adapt the power to the operating conditions of the differential 2. The reduction shaft 1 is connected to the drive motor 4 via the first section 11 and to the housing 22 of the differential 2 via the second section 12. This helps to distribute the weight of the power system, improving its balance and reducing abnormal noises and vibrations when mounted on a vehicle, thus improving its NVH performance and handling stability. One end of the housing 22 is projected onto the first projection plane within the projection of the flywheel 3 onto the first projection plane, which helps to make the two ends of the housing 22 in the width direction close to the distances of the wheels 9, thereby improving its NVH performance and handling stability.

[0122] In this embodiment, the width direction of the housing 22 refers to the direction in which it is connected to the two ends of the two half-shafts 8 respectively.

[0123] In this embodiment, the length direction of the housing 22 refers to the direction that is perpendicular to the width direction of the housing 22 and extends in the horizontal direction.

[0124] In related technologies, the transmission is generally not located on the centerline of the car, but rather off-center to one side of the vehicle. Therefore, the two half-shafts (8) of the car are not of equal length. This unequal-length half-shaft structure is prone to generating abnormal noise and vibration during normal operation, which can shorten the service life of the powertrain and affect the driver's handling stability.

[0125] The power system of this application reduces the difference in length between the two ends of the housing 22 and the wheel 9 by arranging one end of the differential 2 housing 2 at a position where the first projection plane coincides with the flywheel 3. This makes it easier for the lengths of the two half-shafts 8 to be close, thereby reducing abnormal noise and vibration during operation.

[0126] In this embodiment, the power system also includes an engine, and the reduction shaft 1 and the differential 2 are located on the same side of the flywheel 3.

[0127] This allows the drive motor 4 and the engine to be positioned on both sides of the flywheel 3, thereby distributing the weight of the power system and reducing abnormal noise and vibration caused by uneven weight distribution.

[0128] Among them, the flywheel 3 can be approximated as a cylinder with a diameter greater than its height. The height direction of the flywheel 3 is parallel to its rotation axis. The same side of the flywheel 3 can refer to the side where the bottom surface of the flywheel 3 faces.

[0129] In this embodiment of the application, the first segment 11 is connected to the second segment 12.

[0130] The first segment 11 and the second segment 12 can be connected by an integral molding process, such as casting, to transmit power from the engine and drive motor 4. Alternatively, they can be connected by a key or other means to transmit power from the engine and drive motor 4. For example, the integral molding process can also be welding or extrusion molding.

[0131] In this embodiment, the drive motor 4 and the flywheel 3 are respectively connected to the first segment 11 via transmission.

[0132] The drive motor 4 can be directly connected to the first segment 11 to drive the first segment 11 to work, or it can be connected to the first segment 11 through an intermediate component to drive the first segment 11 to work.

[0133] The flywheel 3 is connected to the first segment 11 via a transmission, meaning that both operate under the drive of the same power source. For example, the flywheel 3 and the first segment 11 can be driven simultaneously by the same power source, or they can be driven by the power source in a selective manner.

[0134] For example, the power source can be an engine.

[0135] In this embodiment of the application, the first segment 11 is farther away from the drive motor 4 than the second segment 12.

[0136] The first segment 11 is arranged sequentially in the axial direction of the reduction shaft 1 than the second segment 12, and the second segment 12 is located between the first segment 11 and the drive motor 4.

[0137] The first segment 11 is connected to the drive motor 4, and the second segment 12 is connected to the housing 22. This arrangement allows the differential 2 to be moved away from the flywheel 3 to a certain extent, thus dispersing the overall weight of the power system of this application.

[0138] In this embodiment, the housing 22 of the differential 2 can be used to transmit torque from the first output gear 21, and also to support and accommodate other components of the differential 2, such as the drive gear, driven gear, and planetary gears. Exemplarily, the housing 22 can accommodate these other components by forming a central control structure.

[0139] In this embodiment, the first output gear 21 drives the housing 22 and the second segment 12.

[0140] The first output gear 21 can drive the housing 22 to rotate through the second section 12, thereby realizing the transmission connection between the housing 22 and the second section 12.

[0141] The first output gear 21 can be sleeved on the outside of the housing 22, and the transmission connection between the gear and the housing 22 is achieved by a fixed connection. The fixed connection can be a bolt connection.

[0142] The first output gear 21 and the second segment 12 can be permanently meshed to achieve a transmission connection.

[0143] In this embodiment of the application, the orthographic projection of one end of the housing 22 onto the first projection plane is located within the orthographic projection of the flywheel 3 onto the first projection plane.

[0144] The axis of the housing 22 and the axis of the wheel 9 need to be collinear. However, due to manufacturing errors and other factors, there will be a certain error in their height direction. This error reduces NVH performance and handling stability. Specifically, this error affects the arrangement of the half-shaft 8 connecting the housing 22 and the wheel 9. That is, the non-collinear housing 22 and wheel 9 will cause the half-shaft 8 to be tilted, which is not conducive to the transmission of torque from the housing 22 by the half-shaft 8. The wheels 9 are generally distributed on both sides of the flywheel 3. Setting one end of the housing 22 so that its orthographic projection on the first projection plane is located within the orthographic projection of the flywheel 3 on the first projection plane helps to increase the distance between the housing 22 and the wheel 9 located on the side of the differential 2. This helps to reduce the tilt angle of the half-shaft 8, thereby enabling the half-shaft 8 to transmit torque from the housing 22, thus improving NVH performance and reducing the decrease in handling stability.

[0145] For example, the width of the housing 22 can be in the range of 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 ​​in the range of 150 to 170 mm.

[0146] The side of the flywheel 3 facing the engine is the engine-transformer end face, which is the surface where the engine and transmission meet. The engine-transformer end face is generally the coordinate origin of the powertrain under the vehicle. This helps to shorten the difference between the two half-shafts 8, thereby improving its NVH performance.

[0147] Since the housing 22 is connected to the half shaft 8, and the connection 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 fitted.

[0148] In this embodiment, 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.

[0149] In this embodiment, the differential 2 is used to adjust the torque obtained by the two half-shafts 8, thereby enabling the vehicle to turn and get out of trouble. Exemplarily, the differential 2 is an open differential 2.

[0150] In some embodiments of this application, as shown in FIG2, the first segment 11 has a first reduction gear 111, the second segment 12 has a second reduction gear 121, the first reduction gear 111 is connected to the drive motor 4 and the flywheel 3 respectively, and the second reduction gear 121 meshes with the first output gear 21.

[0151] In this embodiment, the second reduction gear 121 meshes with the first output gear 21, which facilitates the second segment 12 driving the housing 22 to rotate via the second reduction gear 121, thereby transmitting the torque of the second segment 12 and enabling the differential 2 to operate normally. Simultaneously, by meshing with the first output gear 21, the second reduction gear 121 reduces the rotational speed transmitted from the second segment 12 to the differential 2, thus increasing the torque received by the differential 2 and driving the wheels 9 and half-shaft 8 to rotate.

[0152] In this embodiment of the application, the drive motor 4 can be connected to the first reduction gear 111 by means of meshing, key connection or other means, and drive the first reduction gear 111 to rotate. Alternatively, it can be connected to the first reduction gear 111 by means of intermediate components, and drive the first reduction gear 111 to rotate.

[0153] In this embodiment, the first reduction gear 111 and the flywheel 3 are connected by an intermediate component for transmission. The flywheel 3 generally drives the first reduction gear 111 to rotate indirectly by driving the intermediate component to rotate.

[0154] In this embodiment, the first reduction gear 111 can be connected to the first segment 11 by an integral molding process or by a key connection. Exemplarily, the integral molding process can also be welding or extrusion molding.

[0155] In this embodiment, the second reduction gear 121 can be connected to the second segment 12 by an integral molding process or by a key connection. Exemplarily, the integral molding process can also be welding or extrusion molding.

[0156] In some embodiments of this application, as shown in FIG2, the drive 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 is connected to the first input shaft 41 in a transmission manner, and meshes with the first reduction gear 111.

[0157] In this embodiment of the application, the drive motor 4 meshes with the first reduction gear 111 through the first input gear 42, which can realize the transmission connection with the first segment 11. By driving the first input gear 42 to rotate, the first reduction gear 111 and the first segment 11 are driven to rotate, thereby driving the differential 2 to work.

[0158] In this embodiment, the first input gear 42 can be connected to the first input shaft 41 either by an integral molding process or by a key connection. The integral molding process can be casting, welding, or extrusion molding.

[0159] In this embodiment, the first input shaft 41 can serve as the rotor shaft of the drive motor 4. The drive motor 4 drives the first input shaft 41 to rotate via the magnetic field formed by the stator. Alternatively, the drive motor 4 can be connected to the first input shaft 41 via a rotor shaft, thereby driving the first input shaft 41 to rotate. The rotor shaft and the first input shaft 41 can be connected via a spline connection or similar method.

[0160] In some embodiments of this application, as shown in FIG3, the first input shaft 41 has a bearing 411, the bearing 411 is sleeved on the first input shaft 41, the orthographic projection of the bearing 411 on the second projection plane is separated from the orthographic projection of the flywheel 3 on the second projection plane, and the second projection plane is a plane perpendicular to the length direction of the housing 22.

[0161] In this embodiment, the orthographic projection of the bearing 411 on the second projection plane is separated from the orthographic projection of the flywheel 3 on the second projection plane. This facilitates the overlap between the drive motor 4 and the flywheel 3 and the engine in the width direction of the power system of this application, thereby shortening the width of the power system of this application.

[0162] In this embodiment, the width direction of the power system is consistent with the width direction of the housing 22.

[0163] In this embodiment of the application, the bearing 411 can support the rotation of the first input shaft 41. The inner ring of the bearing 411 is connected to the first input shaft 41, and the outer ring of the bearing 411 can be connected to other components, so as to realize the rotation of the first input shaft 41 under the drive of the drive motor 4.

[0164] In some embodiments of this application, as shown in FIG4, 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 both sleeved on the second input shaft 51 and are connected to the second input shaft 51 for transmission. The second input gear 52 meshes with the second reduction gear 121.

[0165] In this embodiment, the flywheel 3 is connected to the second input shaft 51 via a transmission, and can drive the second input shaft 51 to rotate, thus driving the engine to start via the second input shaft 51.

[0166] In this embodiment, the second input shaft 51 meshes with the second reduction gear 121 via the second input gear 52, which can drive the second reduction gear 121 to rotate, thereby driving the differential 2 to rotate. The second reduction gear 121 can also reduce the rotational speed transmitted to the differential 2 by the second segment 12, thus increasing the torque obtained by the differential 2, thereby driving the wheels 9 and half-shaft 8 to rotate.

[0167] In this embodiment, the second input shaft 51 can be used as the crankshaft of an engine, rotating under the drive of the piston, or it can be connected to the crankshaft through a coupling or other structure to achieve transmission and be driven by the piston.

[0168] In this embodiment, the second input shaft 51 and the second input gear 52 can be connected by an integral molding process, such as casting, to transmit power from the engine, or they can be connected by a key or other means to transmit power from the engine. The integral molding process can also be welding or extrusion molding.

[0169] In some embodiments of this application, as shown in FIG4, the power system includes a generator 6, which is connected to a second input shaft 51.

[0170] In this embodiment, the second input shaft 51 is connected to the generator 6 via a transmission, which facilitates the second input shaft 51 to output kinetic energy to the generator 6, enabling the generator 6 to generate electricity to power other components.

[0171] In this embodiment, the generator 6 can be directly connected to the second input shaft 51 via a key, coupling, or other structure for transmission, and rotates under the drive of the second input shaft 51 to generate electricity. Alternatively, the generator 6 can be connected to the second input shaft via an intermediate component, and rotate under the drive of the second input shaft 51 to generate electricity.

[0172] In this embodiment, the generator 6 can be electrically connected to the drive motor 4, and the electrical energy generated by the generator can be directly applied to the drive motor 4, so that the drive motor 4 can drive the differential 2 to work.

[0173] In this embodiment of the application, the electrical energy generated by the generator 6 can also be stored in the power supply so that other components can draw power when they are working.

[0174] Those skilled in the art will understand that all or part of the steps of the above embodiments can be implemented by hardware or by a program instructing related hardware. The program can be stored in a computer-readable storage medium, such as a read-only memory, a disk, or an optical disk.

[0175] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A power system, characterized in that, The power system includes 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) includes a first section (11) and a second section (12). The first section (11) is connected to the second section (12). The drive motor (4) and the flywheel (3) are respectively connected to the first section (11) in a transmission. The first section (11) is farther away from the drive motor (4) than the second section (12). The differential (2) includes a first output gear (21) and a housing (22). The first output gear (21) drives the housing (22) and the second section (12). One end of the housing (22) is projected onto the first projection plane in the orthographic projection of the flywheel (3) onto the first projection plane. The first projection plane is a plane perpendicular to the length direction of the housing (22).

2. The power system according to claim 1, characterized in that, The first segment (11) has a first reduction gear (111), the second segment (12) has a second reduction gear (121), the first reduction gear (111) is connected to the drive motor (4) and the flywheel (3) respectively, and the second reduction gear (121) meshes with the first output gear (21).

3. The power system according to claim 2, characterized in that, The drive 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 is connected to the first input shaft (41) in a transmission manner. The first input gear (42) meshes with the first reduction gear (111).

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

5. The power system according to claim 2, characterized in that, 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 both sleeved on the second input shaft (51) and are connected to the second input shaft (51) for transmission. The second input gear (52) meshes with the second reduction gear (121).

6. The power system according to claim 5, characterized in that, The power system includes a generator (6), which is connected to the second input shaft (51) via a drive.

7. The power system according to claim 6, characterized in that, The generator (6) has a second output gear (61), and the power system includes a third input gear (53). The third input gear (53) is sleeved on the second input shaft (51) and is connected to the second input shaft (51) in a driving manner. The third input gear (53) meshes with the second output gear (61).

8. The power system according to claim 7, characterized in that, The power system includes a clutch (7), the second input gear (52) is rotatable relative to the second input shaft (51), the second input shaft (51) is rotatable to drive the third input gear (53) to rotate, and the clutch (7) connects the second input gear (52) and the third input gear (53).

9. The power system according to claim 1, characterized in that, The orthographic projection of the flywheel (3) onto the third projection plane coincides with the orthographic projection of the deceleration shaft (1) onto the third projection plane, which is a plane perpendicular to the width direction of the housing (22).

10. A car, characterized in that, The vehicle includes a power system, which includes 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) includes a first section (11) and a second section (12). The first section (11) is connected to the second section (12). The drive motor (4) and the flywheel (3) are respectively connected to the first section (11) in a transmission. The first section (11) is farther away from the drive motor (4) than the second section (12). The differential (2) includes a first output gear (21) and a housing (22). The first output gear (21) drives the housing (22) and the second section (12). One end of the housing (22) is projected onto the first projection plane in the orthographic projection of the flywheel (3) onto the first projection plane. The first projection plane is a plane perpendicular to the length direction of the housing (22).

11. The automobile according to claim 10, characterized in that, The first segment (11) has a first reduction gear (111), the second segment (12) has a second reduction gear (121), the first reduction gear (111) is connected to the drive motor (4) and the flywheel (3) respectively, and the second reduction gear (121) meshes with the first output gear (21).

12. The automobile according to claim 11, characterized in that, The drive 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 is connected to the first input shaft (41) in a transmission manner. The first input gear (42) meshes with the first reduction gear (111).

13. The automobile according to claim 12, characterized in that, The first input shaft (41) has a bearing (411), the bearing (411) is sleeved on the first input shaft (41), the orthographic projection of the bearing (411) on the second projection plane is separated from the orthographic projection of the flywheel (3) on the second projection plane, the second projection plane is a plane perpendicular to the width direction of the housing (22).

14. The automobile according to claim 11, characterized in that, 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 both sleeved on the second input shaft (51) and are connected to the second input shaft (51) for transmission. The second input gear (52) meshes with the second reduction gear (121).

15. The automobile according to claim 14, characterized in that, The power system includes a generator (6), which is connected to the second input shaft (51) via a drive.

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