Electric drive axle structure and system

Abstract

The invention belongs to the technical field of new energy vehicle driving, and particularly relates to an electric drive axle structure and system. The electric drive axle structure comprises a speed change module and a differential mechanism, the speed change module adopts modular design and is assembled in a shell, a first assembly interface and a second assembly interface are arranged on the speed change module, and the first assembly interface is used for being connected with a rotor output shaft of a drive motor so as to transmit power of the drive motor to an input gear of the speed change module; the second assembly interface comprises a gear part and an end cover part, the gear part is used for being connected with a differential mechanism so as to transmit power output by the speed change module to the differential mechanism through an output gear, the differential mechanism is used for being connected with a driving half shaft of an axle, and the end cover part is used for being connected with the axle. According to the electric drive bridge structure, the design time of the electric drive bridge is shortened, and the design efficiency of the electric drive bridge is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy vehicle driving, and in particular relates to an electric drive axle structure and system. Background Art

[0002] The drive axle on a traditional truck is a mechanism located at the end of the transmission system that can change the speed and torque from the transmission and transmit them to the drive wheels. With the improvement of motor technology, the performance of the drive motor has gradually improved. It is increasingly difficult for ordinary rear axles to play the role of deceleration and torque increase. Therefore, the electric drive axle technology was officially born and has become the main trend in the development of new energy vehicles in the future. The electric drive axle integrates the motor into the wheel hub or axle of the vehicle, and realizes power distribution and vehicle stability control by individually controlling each motor. Due to the variety of road types, the torque and power required by new energy vehicles under different road conditions are also quite different. At present, the electric drive axle structure of various models is generally designed according to different models, operating conditions and bridge housing space. When the application conditions of the vehicle change, the electric drive axle needs to be redesigned and replaced as a whole according to different application conditions. Therefore, the existing electric drive axle structure has poor adaptability. Summary of the invention

[0003] The object of the present invention is to provide an electric drive bridge structure and system to solve the problem of poor adaptability of the existing electric drive bridge structure.

[0004] In order to solve the above technical problems, the present invention provides an electric drive axle structure, including a speed change module and a differential. The speed change module adopts a modular design and is assembled in a shell, on which a first assembly interface and a second assembly interface are arranged. The first assembly interface is used to connect with the rotor output shaft of the drive motor to transmit the power of the drive motor to the input gear of the speed change module; the second assembly interface includes a gear part and an end cover part, wherein the gear part is used to connect with the differential to transmit the power output by the speed change module to the differential through the output gear, the differential is used to connect with the driving half shaft of the axle, and the end cover part is used to connect with the axle.

[0005] Furthermore, the first assembly interface includes a spline portion and an end cover portion.

[0006] Furthermore, the transmission module is a two-speed AMT transmission module or a single-stage reduction module.

[0007] Furthermore, the speed transmission module includes two, namely a first speed transmission module and a second speed transmission module. The first speed transmission module is used to connect to the first drive motor through its first assembly interface and is connected to the differential through its second assembly interface. The second speed transmission module is used to connect to the second drive motor through its first assembly interface and is connected to the differential through its second assembly interface.

[0008] Furthermore, the first transmission module is a two-speed AMT transmission module, the second transmission module is a single-stage reduction module, or the first transmission module and the second transmission module are both two-speed AMT transmission modules.

[0009] The beneficial effects of the above technical solution are as follows: the present invention is an improved invention, the present invention modularizes the transmission, assembles it in a housing, and sets a first assembly interface and a second assembly interface on the housing, connects the input gear of the speed change module with the rotor output shaft of the drive motor through the first assembly interface, and connects the speed change module with the differential and the axle through the second assembly interface. In actual use, the required speed change module can be determined according to the vehicle type and application conditions, and then the drive motor, the determined speed change module and a differential are directly combined and assembled to form an electric drive axle configuration suitable for different new energy vehicles and under different working conditions. The modular design reduces the design time of the electric drive axle structure and improves the design efficiency of the electric drive axle structure.

[0010] In order to solve the above technical problems, the present invention also provides an electric drive axle system, including a drive motor, a speed change module and a differential. The speed change module adopts a modular design and is assembled in a shell, on which a first assembly interface and a second assembly interface are arranged. The first assembly interface is used to connect with the rotor output shaft of the drive motor to transmit the power of the drive motor to the input gear of the speed change module; the second assembly interface includes a gear part and an end cover part, wherein the gear part is used to connect with the differential to transmit the power output by the speed change module to the differential through the output gear, the differential is used to connect with the drive half shaft of the axle, and the end cover part is used to connect with the axle.

[0011] Furthermore, the transmission module is a two-speed AMT transmission module or a single-stage reduction module.

[0012] Furthermore, the speed transmission module includes two, namely a first speed transmission module and a second speed transmission module. The first speed transmission module is used to connect to the first drive motor through its first assembly interface and is connected to the differential through its second assembly interface. The second speed transmission module is used to connect to the second drive motor through its first assembly interface and is connected to the differential through its second assembly interface.

[0013] Furthermore, the first transmission module is a two-speed AMT transmission module, the second transmission module is a single-stage reduction module, or the first transmission module and the second transmission module are both two-speed AMT transmission modules.

[0014] Furthermore, the drive motor is arranged at one end close to the drive shaft, and the differential is arranged at the other end close to the drive shaft.

[0015] The beneficial effects of the above technical solution are as follows: the present invention is an improved invention, the present invention modularizes the transmission, assembles it in a housing, and sets a first assembly interface and a second assembly interface on the housing, connects the input gear of the speed change module with the rotor output shaft of the drive motor through the first assembly interface, and connects the speed change module with the differential and the axle through the second assembly interface. In actual use, the required speed change module can be determined according to the vehicle type and application conditions, and then the drive motor, the determined speed change module and a differential are directly combined and assembled to form an electric drive axle configuration suitable for different new energy vehicles and under different working conditions. The modular design reduces the design time of the electric drive axle system and improves the design efficiency of the electric drive axle system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of a single-motor two-speed AMT electric drive axle system of an electric drive axle system embodiment of the present invention; Figure 2 Schematic diagram of a single-motor single-stage reduction electric drive axle system of an electric drive axle system embodiment of the present invention; Figure 3 Schematic diagram of a dual-motor two-speed AMT plus single-stage reduction electric drive axle system of an electric drive axle system embodiment of the present invention; Figure 4 Schematic diagram of a dual-motor dual-two-speed AMT electric drive axle system of an electric drive axle system embodiment of the present invention; Figure 5 is a schematic diagram of a speed change module of an electric drive axle system embodiment of the present invention; Figure numerals: 1. driving the left wheel; 2. driving motor; 3. input gear of the two-speed AMT transmission module; 4. first gear gear; 5. second gear gear; 6. synchronizer; 7. output gear of the two-speed AMT transmission module; 8. driving the right wheel; 9. input gear of the single-stage reduction module; 10. output gear of the single-stage reduction module; 11. differential; 12. first assembly interface; 13. second assembly interface; 201. first driving motor; 202. second driving motor. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the present invention more clear, the specific implementation methods of the present invention are further described below in conjunction with the accompanying drawings.

[0018] The present invention conducts modular design of the transmission, assembles it in a housing, and sets a first assembly interface and a second assembly interface on the housing, connects the input gear of the speed change module with the rotor output shaft of the drive motor through the first assembly interface, and connects the speed change module with the differential and the axle through the second assembly interface. In actual use, the required speed change module can be determined according to the vehicle type and application conditions, and then the drive motor, the determined speed change module and a differential are directly assembled to form an electric drive axle configuration suitable for different new energy vehicles and required under different working conditions, without the need for redesign. The modular design reduces the design time of the electric drive axle and improves the design efficiency of the electric drive axle structure. At the same time, it solves the problem of insufficient torque or torque waste caused by using a single-design electric drive axle under different working conditions for the same vehicle model, so that new energy vehicles under different application conditions have corresponding electric drive axle matching solutions, ensuring the economy of the vehicle and improving the driving quality of the driver.

[0019] Electric drive axle system embodiment An electric drive axle system of the present invention includes a drive motor and an electric drive axle structure, wherein the electric drive axle structure includes a speed change module and a differential, and the speed change module is assembled in a housing, such as Figure 5 As shown, the housing is provided with a first assembly interface 12 and a second assembly interface 13, and both the first assembly interface and the second assembly interface are mechanical interfaces. The first assembly interface includes a spline portion and an end cover portion, and the end cover portion of the first assembly interface is used to protect the internal structure of the transmission module when the drive motor is not connected, and the spline portion provides a connection port for the input gear of the transmission module and the rotor output shaft of the drive motor to transmit the power of the drive motor to the input gear of the transmission module. The second assembly interface is used for connecting with the differential and the axle, and includes a gear portion and an end cover portion, wherein the gear portion is used to connect with the differential, and provides a connection port for the output gear of the transmission module and the differential, so that the power output by the transmission module is transmitted to the differential through the output gear, and the differential is used to connect with the driving half shaft of the axle, and the end cover portion of the second assembly interface is used to protect the internal structure of the transmission module when the axle is not connected, and is used to connect with the axle when the electric drive axle is combined. The drive motor, at least one transmission module and a differential are assembled and combined through the first assembly interface and the second assembly interface. After assembly, the drive motor, the differential and the transmission module housing are fixedly connected to obtain the electric drive axle system required by the vehicle.

[0020] Among them, the speed change module is a two-speed AMT speed change module or a single-stage reduction module. The two-speed AMT speed change module includes an input gear, a synchronizer, an output gear, a first gear and a second gear connected to the rotor output shaft of the drive motor; the first gear is rollingly connected to the input gear, the second gear is rollingly connected to the output gear, the second gear is slidingly connected to the synchronizer, and the output gear is used to connect to the differential. The single-stage reduction module includes an input gear connected to the rotor output shaft of the drive motor, an output gear connected to the differential, the input gear is a driving gear, the output gear is a driven gear, and the input gear and the output gear are rollingly connected. Further, in order to adapt to more vehicle drive requirements, the speed change module can also be a multi-speed AMT speed change module, such as a three-speed AMT transmission. The drive motor is arranged at one end close to the drive shaft, and the differential is arranged at the other end close to the drive shaft.

[0021] When the application condition requires a single motor, there is one speed module, which can be an AMT speed module or a single-stage reduction module. When the speed module is a two-speed AMT speed module, a single-motor two-speed electric drive axle system can be directly assembled. Figure 1 As shown, it includes a driving motor 2, a two-speed AMT transmission module connected to the rotor output shaft of the driving motor 2, and a differential 11 connected to the output gear 7 of the two-speed AMT transmission module. The two-speed AMT transmission module includes an input gear 3, a first gear 4, a second gear 5, a synchronizer 6 and an output gear 7 of the two-speed AMT transmission module. After splicing, the driving motor 2 is fixedly connected to the transmission module housing, the rotor driving shaft of the driving motor 2 is connected to the input gear 3 of the two-speed AMT transmission module, the input gear 3 of the two-speed AMT transmission module is rollingly connected to the first gear 4, the first gear 4 is slidingly connected to the synchronizer 6, the synchronizer 6 is slidingly connected to the second gear 5, the second gear 5 is rollingly connected to the output gear 7 of the two-speed AMT transmission module, the output gear 7 of the two-speed AMT transmission is fixedly connected to the differential 11, and the driving shaft where the differential 11 is located is fixedly connected to the driving left wheel 1 and the driving right wheel 8. When the electric drive axle drives the vehicle, the power transmission of the drive motor 2 is as follows: when the two-speed AMT transmission module is changed to the first gear, the synchronizer 6 is shifted to the first gear 4 position, and the power is sequentially driven through the input gear 3 of the two-speed AMT transmission module, the first gear 4 and the output gear 7 of the two-speed AMT transmission module and the differential 11 to drive the left wheel 1 and the right wheel 8; when the two-speed AMT transmission module is changed to the second gear, the synchronizer 6 is shifted to the second gear 5 position, and the power is sequentially driven through the input gear 3 of the two-speed AMT transmission module, the second gear 5 and the output gear 7 of the two-speed AMT transmission module and the differential 11 to drive the left wheel 1 and the right wheel 8. Compared with the traditional central drive structure, the electric drive axle structure has the characteristics of high integration, high transmission efficiency and high scalability. At the same time, the cost and weight of the electric drive axle are reduced, which improves the economy of the vehicle.

[0022] When the speed change module is a single-stage reduction module, a single-motor single-stage reduction electric drive axle system can be directly assembled. In the above single-motor two-speed electric drive axle system, the first gear 4, the second gear 5 and the synchronizer 6 are removed, and the remaining structure is retained to expand the single-motor single-stage reduction electric drive axle system. Figure 2 As shown, it includes a driving motor 2, a single-stage reduction module connected to the rotor output shaft of the driving motor 2, and a differential 11 connected to the output gear of the single-stage reduction module. After splicing, the input gear 9 of the single-stage reduction module is a single-speed driving gear, and the output gear 10 of the single-stage reduction module is a single-speed driven gear. Among them, the driving motor 2 integrated assembly is fixedly connected to the housing of the single-stage reduction module, the input gear 9 of the single-stage reduction module is rollingly connected to the output gear 10, the output gear 10 of the single-stage reduction module is fixedly connected to the differential 11, and the driving shaft where the differential 11 is located is fixedly connected to the driving left wheel 1 and the driving right wheel 8. When the electric drive axle drives the vehicle, the driving motor 2 transmits power to the input gear 9 of the single-stage reduction module, and the input gear 9 of the single-stage reduction module transmits power to the output gear 10, and finally the output gear 7 transmits power to the driving left wheel 1 and the driving right wheel 8 through the differential 11, driving the vehicle to travel.

[0023] When the application conditions require two motors, two speed transmission modules can be set, namely a first speed transmission module and a second speed transmission module. The first speed transmission module is used to connect to the first drive motor through its first assembly interface, and is connected to the differential through its second assembly interface; the second speed transmission module is used to connect to the second drive motor through its first assembly interface, and is connected to the differential through its second assembly interface.

[0024] Among them, when the first transmission module is a two-speed AMT transmission module and the second transmission module is a single-stage reduction module, a single-motor single-stage reduction electric drive axle system can be directly assembled. That is, the above-mentioned single-motor multi-speed electric drive axle system is merged with the single-motor single-stage reduction electric drive axle system, and the differential in the single-motor single-stage reduction electric drive axle system is removed, and the output gear in the single-motor single-stage reduction electric drive axle system is connected to the differential in the single-motor multi-speed electric drive axle system, thus expanding a dual-motor two-speed AMT plus single-stage reduction electric drive axle system. Figure 3As shown, the dual-motor two-speed AMT plus single-stage reduction electric drive axle system includes two drive motors (a first drive motor 201 and a second drive motor 202), a two-speed AMT transmission module, a single-stage reduction module and a differential 11. The rotor output shaft of the first drive motor 201 is connected to the input gear 3 of the two-speed AMT transmission module, the rotor output shaft of the second drive motor 202 is connected to the input gear 9 of the single-stage reduction module, the output gear 7 of the two-speed AMT transmission module and the output gear 10 of the single-stage reduction module are both connected to the differential 11, and the drive shaft where the differential 11 is located is fixedly connected to the drive left wheel 1 and the drive right wheel 8. When the electric drive axle drives the vehicle, the power of the drive motor 201 passes through the input gear 3 of the two-speed AMT transmission module. When the synchronizer 6 is pushed to the first gear 4, the power passes through the first gear 4 and the output gear 7 of the two-speed AMT transmission module in sequence, and is transmitted to the drive left wheel 1 and the drive right wheel 8 through the differential 11; when the synchronizer 6 is pushed to the second gear 5, the power passes through the second gear 5 and the output gear 7 of the two-speed AMT transmission module in sequence, and is transmitted to the drive left wheel 1 and the drive right wheel 8 through the differential 11; the power of the drive motor 202 passes through the input gear 9 of the single-stage reduction module and the output gear 10 of the single-stage reduction module in sequence, and is transmitted to the drive left wheel 1 and the drive right wheel 8 through the differential 11. Compared with the single-motor two-speed AMT electric drive axle system, adding an additional drive motor and a single-stage reduction module can provide greater torque for new energy vehicles.

[0025] When the first transmission module and the second transmission module are both two-speed AMT transmission modules, a dual-motor dual-speed AMT electric drive axle system can be directly assembled. That is, the two single-motor two-speed AMT electric drive axle systems mentioned above are combined, and the differential of one of the electric drive axle systems is removed, and the two output gears are connected to one differential, thus expanding the dual-motor dual-speed AMT electric drive axle system. Figure 4 As shown, the dual-motor dual two-speed AMT electric drive axle system includes a first drive motor 201, a second drive motor 202, two two-speed AMT transmission modules and a differential 11. The rotor output shafts of the two drive motors are respectively connected to the input gear 3 of a two-speed AMT transmission module, and the output gears 7 of the two AMT transmission modules are connected to the differential 11. Compared with the single-motor two-speed AMT electric drive axle structure, adding a drive motor and a two-speed AMT transmission module can provide greater torque for new energy vehicles, and can perform shift control according to the dual motors and the gear position of the transmission module, so that the output power shift is not interrupted.

[0026] When a light or medium-sized new energy vehicle is driven by a single shaft, a single-motor two-speed AMT electric drive axle system or a single-motor single-stage reduction electric drive axle system is matched with the vehicle; if a light or medium-sized new energy vehicle is driven by a dual shaft, two single-motor single-stage reduction electric drive axle systems are matched with the vehicle, and the two single-motor single-stage reduction electric drive axle systems are respectively set on the two drive shafts to achieve common drive. When a heavy-duty new energy vehicle is driven by a single shaft, a dual-motor two-speed AMT plus single-stage reduction electric drive axle system or a dual-motor dual two-speed AMT electric drive axle system is matched with the vehicle; if a heavy-duty new energy vehicle is driven by a dual shaft, two single-motor two-speed AMT electric drive axle systems or a single-motor two-speed AMT electric drive axle system plus a single-motor single-stage reduction electric drive axle system are matched with the vehicle, and the two electric drive axle systems are respectively set on the two drive shafts.

[0027] Electric drive bridge structure embodiment The present invention further provides an electric drive bridge structure, which is an electric drive bridge structure introduced in the above electric drive bridge system embodiment and will not be described in detail here.

Claims

1. An electric drive bridge structure, It is characterized in that It includes a transmission module and a differential. The transmission module adopts a modular design and is assembled in a shell. A first assembly interface and a second assembly interface are provided on the transmission module. The first assembly interface is used to connect with the rotor output shaft of the drive motor to transmit the power of the drive motor to the input gear of the transmission module; the second assembly interface includes a gear part and an end cover part, wherein the gear part is used to connect with the differential to transmit the power output by the transmission module to the differential through the output gear, the differential is used to connect with the driving half shaft of the axle, and the end cover part is used to connect with the axle.

2. The electric drive bridge structure according to claim 1, It is characterized in that The first assembly interface includes a spline portion and an end cover portion.

3. The electric drive bridge structure according to claim 1, It is characterized in that The transmission module is a two-speed AMT transmission module or a single-stage reduction module.

4. The electric drive bridge structure according to claim 1, It is characterized in that The speed transmission module includes two, namely a first speed transmission module and a second speed transmission module. The first speed transmission module is used to connect to the first drive motor through its first assembly interface and is connected to the differential through its second assembly interface. The second speed transmission module is used to connect to the second drive motor through its first assembly interface and is connected to the differential through its second assembly interface.

5. The electric drive bridge structure according to claim 4, It is characterized in that The first transmission module is a two-speed AMT transmission module, the second transmission module is a single-stage reduction module, or the first transmission module and the second transmission module are both two-speed AMT transmission modules.

6. An electric drive axle system, comprising a drive motor, It is characterized in that It also includes a transmission module and a differential. The transmission module adopts a modular design and is assembled in a shell, on which a first assembly interface and a second assembly interface are provided. The first assembly interface is used to connect with the rotor output shaft of the drive motor to transmit the power of the drive motor to the input gear of the transmission module; the second assembly interface includes a gear part and an end cover part, wherein the gear part is used to connect with the differential to transmit the power output by the transmission module to the differential through the output gear, the differential is used to connect with the drive half shaft of the axle, and the end cover part is used to connect with the axle.

7. The electric drive axle system according to claim 6, It is characterized in that The transmission module is a two-speed AMT transmission module or a single-stage reduction module.

8. The electric drive axle system according to claim 6, It is characterized in that The speed transmission module includes two, namely a first speed transmission module and a second speed transmission module. The first speed transmission module is used to connect to the first drive motor through its first assembly interface and is connected to the differential through its second assembly interface. The second speed transmission module is used to connect to the second drive motor through its first assembly interface and is connected to the differential through its second assembly interface.

9. The electric drive axle system according to claim 8, It is characterized in that The first transmission module is a two-speed AMT transmission module, the second transmission module is a single-stage reduction module, or the first transmission module and the second transmission module are both two-speed AMT transmission modules.

10. The electric drive axle system according to claim 6, It is characterized in that The drive motor is arranged at one end close to the drive shaft, and the differential is arranged at the other end close to the drive shaft.

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