Electronic differential coaxial three-section electric drive axle

Abstract

The utility model provides a kind of electronic differential coaxial three-section electric drive axle.The electronic differential coaxial three-section electric drive axle includes electric drive axle shell and the two groups of drive components symmetrically arranged therein, the drive component includes electric drive axle shell and the two groups of drive components symmetrically arranged therein, the drive component includes sequentially connected input unit, intermediate unit and output unit, the input unit includes multiple motors, converges to the same input shaft, and connects multiple intermediate units, multiple intermediate units converge to the same output unit, the intermediate unit is equipped with gear shifting mechanism and synchronously switches.The electronic differential coaxial three-section electric drive axle provided by the utility model solves the problem that the existing electric drive axle cannot meet the specific working condition use requirements.

Description

Technical Field

[0001] This utility model relates to the field of electric drive axles, specifically to an electronic differential coaxial three-section electric drive axle. Background Technology

[0002] The electrification of new energy commercial vehicles, especially heavy-duty tractors, is accelerating, particularly those using electric drive axles. As new energy heavy-duty trucks develop towards higher efficiency and lighter weight, traditional mechanical electric drive axles are gradually becoming a technological bottleneck due to their complex structure, high energy consumption, and significant differential losses. Using motor torque vector control to achieve electronic differential function can effectively solve these problems; however, existing such devices, due to the increased number of motors, significantly increase the number of transmission components, resulting in large size and weight of the electric drive axle, low transmission efficiency, and inability to meet the needs of commercial vehicles. Utility Model Content

[0003] To address the problem that existing electric drive bridges cannot meet the requirements of specific operating conditions, this utility model provides an electronic differential coaxial three-section electric drive bridge that solves the above-mentioned problems.

[0004] An electronic differential coaxial three-section electric drive bridge includes an electric drive bridge housing and two sets of drive components symmetrically disposed therein. The drive components include an input unit, an intermediate unit and an output unit connected in sequence. The input unit includes multiple motors that converge to the same input shaft and are connected to multiple intermediate units. The multiple intermediate units converge to the same output unit. The intermediate unit is provided with a shifting mechanism and switches synchronously.

[0005] In a preferred embodiment of the electronic differential coaxial three-section electric drive bridge provided by this utility model, the input unit includes a motor and input teeth fixedly disposed on the motor spindle, and the input teeth of multiple input units are all connected to the same input shaft. The input unit also includes a front large tooth and a front small tooth fixedly disposed on the input shaft, the front large tooth meshing with multiple input teeth simultaneously, and the front small tooth connecting with multiple intermediate units simultaneously.

[0006] In a preferred embodiment of the electronic differential coaxial three-section electric drive bridge provided by this utility model, the intermediate unit includes an intermediate shaft, an intermediate tooth fixedly disposed on the intermediate shaft, an intermediate large tooth and an intermediate small tooth rotatably disposed on the intermediate shaft, the intermediate teeth of multiple intermediate units mesh with the front small tooth of the same input unit, and the intermediate large tooth and the intermediate small tooth of multiple intermediate units are all connected to the same output unit.

[0007] The shifting mechanism is located on the intermediate shaft and between the intermediate large gear and the intermediate small gear. The higher gear position of the shifting mechanism is the intermediate shaft connected to the intermediate large gear, and the lower gear position is the intermediate shaft connected to the intermediate small gear.

[0008] In a preferred embodiment of the electronic differential coaxial three-section electric drive bridge provided by this utility model, the output unit includes a front output shaft, a rear large tooth and a rear small tooth fixedly disposed on the front output shaft, the rear small tooth simultaneously meshing with the middle large teeth of multiple intermediate units, and the rear large tooth simultaneously meshing with the middle small teeth of multiple intermediate units.

[0009] The output unit further includes an output planetary gear set, a wheel-side planetary gear set, and a rear output shaft. The sun gear of the output planetary gear set is connected to the front output shaft, the planet carrier is connected to the rear output shaft, and the rear output shaft extends outside the electric drive bridge housing and is connected to the wheel-side planetary gear set.

[0010] In a preferred embodiment of the electronic differential coaxial three-section electric drive bridge provided by this utility model, the motor is located in the middle position of the electric drive bridge housing, and the input shaft, the intermediate shaft, and the front output shaft extend sequentially to both ends of the electric drive bridge housing.

[0011] Compared with existing technologies, the electronic differential coaxial three-section electric drive bridge provided by this utility model has the following advantages:

[0012] 1. The solution provided by this utility model adopts two sets of symmetrical drive components. Dynamic electronic differential is realized through independent torque control of the motor to replace the mechanical differential, eliminate the mechanical loss of the differential, improve transmission efficiency, and enhance the handling stability on curves and low-friction surfaces.

[0013] 2. The solution provided by this utility model adopts a two-speed scheme with a pre-engaged synchronizer, which ensures that there is no power interruption during the shifting process and guarantees the continuous output of heavy trucks in scenarios such as slopes and high speeds. The two-speed design solves the problem of the limited speed ratio of the single-speed electric drive axle.

[0014] 3. The solution provided by this utility model adopts a coaxial three-section layout combined with the design of multiple motor power confluence, realizing lightweight and high integration design, reducing the number of transmission components, reducing weight, improving space utilization, and adapting to the compact layout requirements of heavy truck chassis. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of an electronic differential coaxial three-section electric drive bridge;

[0016] Figure 2 yes Figure 1 A magnified view of a portion of the image.

[0017] The following components are labeled in the diagram: Electric drive bridge housing 1, Motor 21, Input gear 22, Input shaft 23, Front large gear 24, Front small gear 25, Intermediate shaft 31, Intermediate gear 32, Intermediate large gear 33, Intermediate small gear 34, Front output shaft 41, Rear large gear 42, Rear small gear 43, Rear output shaft 44, Output planetary gear set 45, Wheel-side planetary gear set 46, Shifting mechanism 5. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0019] Please also refer to Figure 1 and Figure 2 These are schematic diagrams of the electronic differential coaxial three-section electric drive bridge of this utility model, and enlarged views of some of its components.

[0020] The electronic differential coaxial three-section electric drive axle includes an electric drive axle housing 1 and two sets of drive components symmetrically arranged therein. Each set of drive components includes an input unit, two intermediate units, an output unit, and a shifting mechanism 5.

[0021] The input unit includes two motors 21 and input teeth 22 located at the ends of the shafts of each motor, as well as an input shaft 23, a large front tooth 24, and a small front tooth 25.

[0022] Four motors 21, comprising two drive assemblies, are centrally located within the electric drive bridge housing 1, arranged symmetrically in opposite pairs with their input teeth 22 facing outwards. All motors 21 are parallel to each other. An input shaft 23 is located between two motors 21 within the same drive assembly. A large front tooth 24 is fixedly mounted at one end near the two motors 21, and a small front tooth 25 is fixedly mounted at the other end. The input shaft 23 is parallel to the motors 21, and the large front tooth 24 simultaneously meshes with both input teeth 22.

[0023] The intermediate unit includes an intermediate shaft 31, an intermediate tooth 32, an intermediate large tooth 33, and an intermediate small tooth 34. The intermediate shaft 31 in the two intermediate units is aligned with two motors 21 in the same drive assembly. Starting from the direction closest to the input unit, the intermediate shaft 31 has, in sequence, a fixed intermediate tooth 32, a rotatably mounted intermediate large tooth 33, and an intermediate small tooth 34. The intermediate tooth 32 in both intermediate units meshes with the front small tooth 25 in the same input unit.

[0024] A shifting mechanism 5 is located on the intermediate shaft 31 between the intermediate large gear 33 and the intermediate small gear 34. When the shifting mechanism 5 is shifted to a higher gear, the intermediate shaft 31 is connected to the intermediate large gear 33; when shifted to a lower gear, the intermediate shaft 31 is connected to the intermediate small gear 55. The shifting mechanism 5 adopts a pre-engaged synchronizer scheme, which has the ability to ensure uninterrupted power during gear shifting.

[0025] The output unit includes a front output shaft 41, a rear large gear 42, a rear small gear 43, a rear output shaft 44, an output planetary gear set 45, and a wheel-side planetary gear set 46.

[0026] The front output shaft 41 is aligned with the input shaft 23. A small rear tooth 43 is located at one end near the input shaft 23, and a large rear tooth 42 is located at the other end. The large middle tooth 33 in one of the two intermediate units meshes with the small rear tooth 43 in the same output unit, and the small middle tooth 34 in one of the two intermediate units meshes with the large rear tooth 42 in the same output unit. The tail end of the front output shaft 41 is connected to the sun gear of the output planetary gear set 45. The planet carrier of the output planetary gear set 45 is connected to the rear output shaft 44. The rear output shaft 44 passes through the electric drive bridge housing 1, and its tail end is connected to the sun gear of the wheel-side planetary gear set 46.

[0027] The two shifting mechanisms 5 in the same drive assembly switch synchronously. When switching to the high gear, the intermediate shaft 31 drives the front output shaft 41 through the intermediate large gear 33 and the rear small gear 43; when switching to the low gear, the intermediate shaft 31 drives the front output shaft 41 through the intermediate small gear 34 and the rear large gear 42.

[0028] Under the above mechanism, by driving the motors 21 with the power of two pairs combined, the mechanical differential is eliminated, and the electronic differential function is achieved by using motor torque vector control.

[0029] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An electrically differential coaxial three-section electric drive axle, characterized in that: The device includes an electric drive bridge housing and two sets of drive components symmetrically disposed therein. Each drive component includes an input unit, an intermediate unit, and an output unit connected in sequence. The input unit includes multiple motors that converge to the same input shaft and are connected to multiple intermediate units. The multiple intermediate units converge to the same output unit. Each intermediate unit is equipped with a shifting mechanism and switches synchronously.

2. The electronic differential coaxial three-section electric drive axle according to claim 1, characterized in that: The input unit includes a motor and input teeth fixedly mounted on the motor spindle, and the input teeth of multiple input units are all connected to the same input shaft.

3. The electronic differential coaxial three-section electric drive bridge according to claim 2, characterized in that: The input unit also includes a large front tooth and a small front tooth fixedly disposed on the input shaft. The large front tooth meshes with multiple input teeth simultaneously, and the small front tooth is connected to multiple intermediate units simultaneously.

4. The electronic differential coaxial three-section electric drive bridge according to claim 3, characterized in that: The intermediate unit includes an intermediate shaft, an intermediate tooth fixedly disposed on the intermediate shaft, a large intermediate tooth and a small intermediate tooth rotatably disposed on the intermediate shaft, the intermediate teeth of multiple intermediate units meshing with the small front tooth of the same input unit, and the large intermediate tooth and the small intermediate tooth of multiple intermediate units all connected to the same output unit.

5. The electronic differential coaxial three-section electric drive bridge according to claim 4, characterized in that: The shifting mechanism is located on the intermediate shaft and between the intermediate large gear and the intermediate small gear. The higher gear position of the shifting mechanism is the intermediate shaft connected to the intermediate large gear, and the lower gear position is the intermediate shaft connected to the intermediate small gear.

6. The electronic differential coaxial three-section electric drive bridge according to claim 4 or 5, characterized in that: The output unit includes a front output shaft, and a rear large tooth and a rear small tooth fixedly disposed on the front output shaft. The rear small tooth simultaneously meshes with the middle large teeth of multiple intermediate units, and the rear large tooth simultaneously meshes with the middle small teeth of multiple intermediate units.

7. The electronic differential coaxial three-section electric drive bridge according to claim 6, characterized in that: The motor is located in the middle of the electric drive bridge housing, and the input shaft, the intermediate shaft, and the front output shaft extend sequentially to both ends of the electric drive bridge housing.

8. The electronic differential coaxial three-section electric drive bridge according to claim 7, characterized in that: The output unit further includes an output planetary gear set, a wheel-side planetary gear set, and a rear output shaft. The sun gear of the output planetary gear set is connected to the front output shaft, the planet carrier is connected to the rear output shaft, and the rear output shaft extends outside the electric drive bridge housing and is connected to the wheel-side planetary gear set.

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