Symmetrical electronic differential electric drive axle

Abstract

Symmetrical electronic differential electric drive axle, including two electric drive modules, with the output end of electric drive module half shaft and assembly in half shaft end wheel end planetary row, it is characterized in that: the electric drive module with half shaft coaxial alignment, two electric drive modules between two half shafts mirror image symmetry arrangement, electric drive module includes multiple motors, the power coupling of multiple motors coupling component and with the coaxial connection of coupling component reduction assembly, half shaft and the output end of reduction assembly are connected, coupling component is parallel axis structure, and reduction assembly is planetary reduction structure.The utility model quality distribution is even, improves the carrying capacity, promotes structural stability and security, fuses the efficient transmission of parallel axis and the compact split torsion characteristics of planetary wheel, shortens transmission chain, optimizes power distribution path, improves the power distribution accuracy between wheels under complex road conditions, improves the road condition adaptability of vehicle.

Description

Technical Field

[0001] This utility model relates to a symmetrical electronic differential electric drive axle, belonging to the field of pure electric drive axle technology. Background Technology

[0002] The electric drive axles used in medium and heavy-duty trucks generally adopt a multi-motor drive mode to adapt to different working conditions and match the power required for the corresponding working conditions. The transmission efficiency and structural design of the electric drive axles used in medium and heavy-duty trucks directly affect the overall vehicle performance. The existing electric drive axle structure cannot be well adapted to the power requirements of large and super-large tonnage trucks. The reasons are: (1) The mass distribution of the electric drive axle is uneven, resulting in poor stress and vibration, leading to poor load-bearing capacity and high safety hazards. (2) The mechanical loss of the differential results in low accuracy of wheel-to-wheel power distribution under complex road conditions. (3) The transmission chain is long, with large energy loss and high maintenance costs. Utility Model Content

[0003] The symmetrical electronic differential drive axle provided by this utility model has a uniform mass distribution, which improves load-bearing capacity, enhances structural stability and safety, integrates the efficient transmission of parallel shafts with the compact torque distribution characteristics of planetary gears, shortens the transmission chain, optimizes the power distribution path, improves the accuracy of power distribution between wheels under complex road conditions, and enhances the vehicle's road condition adaptability.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A symmetrical electronic differential drive axle includes two drive modules, a half-shaft connected to the output end of the drive modules, and a planetary gear set mounted on the end of the half-shaft. The drive modules are coaxially aligned with the half-shafts, and the two drive modules are arranged in a mirror-symmetrical manner between the two half-shafts. Each drive module includes multiple motors, a coupling assembly that couples the power of the multiple motors, and a reduction assembly coaxially connected to the coupling assembly. The half-shafts are connected to the output end of the reduction assembly. The coupling assembly is a parallel shaft structure, and the reduction assembly is a planetary reduction structure.

[0006] Preferably, the coupling assembly includes a constant meshing shaft and an input shaft parallel to the constant meshing shaft. The shaft end of one motor is connected to the constant meshing shaft, and the shaft ends of the other motors are respectively connected to the input shaft. The input shaft is disposed on the outer periphery of the constant meshing shaft. A constant meshing gear is fixed on the constant meshing shaft, and an input gear that meshes with the constant meshing gear is fixed on the input shaft. The outer diameter of the constant meshing gear is larger than the outer diameter of the input gear. The constant meshing shaft is connected to the input end of the reduction assembly.

[0007] Preferably, the reduction assembly includes a sun gear coaxially connected to the constant meshing shaft, a planet carrier, a planet shaft rotatably mounted on the planet carrier, a first planet gear meshing with the sun gear and fixed on the planet shaft, a gear ring fixed to the bridge housing, and a second planet gear meshing with the gear ring and fixed on the planet shaft. The outer diameter of the second planet gear is smaller than the outer diameter of the first planet gear, and the output end of the planet carrier is connected to the half shaft.

[0008] Preferably, the sun gear, the constant meshing shaft, and the constant meshing gear are integrally formed.

[0009] Preferably, the electric drive module contains three motors.

[0010] The beneficial effects of this utility model are:

[0011] This utility model discloses a symmetrical electronic differential drive axle. Two electric drive modules are arranged mirror-symmetrically between the two half-shafts and coaxially aligned with them. One electric drive module drives one half-shaft, and the other drives the other half-shaft, forming two sets of symmetrical transmission structures from the motor, coupling assembly, reduction assembly, half-shaft to the planetary gear set at the wheel end. This ensures uniform mass distribution of the electric drive axle, improves load-bearing capacity, and enhances structural stability and safety. The coupling assembly adopts a parallel shaft structure, and the reduction assembly adopts a planetary reduction structure, combining the high-efficiency transmission of the parallel shaft with the compact torque distribution characteristics of the planetary gears. This shortens the transmission chain and optimizes the power distribution path, reducing energy consumption, axle weight, and volume, facilitating vehicle layout. The two electric drive modules drive the two half-shafts respectively. By adjusting the number of motors involved in the drive and the motor output power in the two electric drive modules, an electronic differential is formed, improving the accuracy of inter-wheel power distribution under complex road conditions and enhancing the vehicle's road adaptability. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the transmission structure of the symmetrical electronic differential drive bridge in a specific implementation.

[0013] Figure 2 for Figure 1 A magnified view of a portion of the image. Detailed Implementation

[0014] The following is combined Figures 1-2 The embodiments of this utility model will be described in detail below.

[0015] A symmetrical electronic differential drive axle includes two drive modules 1, a half-shaft 2 connected to the output end of the drive module 1, and a planetary gear set 3 mounted on the end of the half-shaft 2. The drive module 1 is coaxially aligned with the half-shaft 2, and the two drive modules 2 are arranged in a mirror-symmetrical manner between the two half-shafts 2. Each drive module 1 includes multiple motors 4, a coupling assembly 5 that power-couples the multiple motors 4, and a reduction assembly 6 coaxially connected to the coupling assembly 5. The half-shaft 2 is connected to the output end of the reduction assembly 6. The coupling assembly 5 is a parallel shaft structure, and the reduction assembly 6 is a planetary reduction structure.

[0016] The symmetrical electronic differential drive axle described above has two electric drive modules 1 arranged in a mirror-symmetrical manner between the two half-shafts 2 and coaxially aligned with them. One electric drive module 1 drives one half-shaft 2 to rotate, and the other electric drive module 1 drives the other half-shaft 2 to rotate, forming two sets of symmetrical transmission structures from the motor 4, coupling component 5, reduction component 6, half-shaft 2 to the planetary gear set 3 at the wheel end. This ensures uniform mass distribution of the electric drive axle, improves load-bearing capacity, and enhances the structural stability and safety of the electric drive axle. The coupling component 5 adopts a parallel shaft structure, and the reduction component 6 adopts a planetary reduction structure, combining the high-efficiency transmission of the parallel shaft with the compact torque distribution characteristics of the planetary gears. This shortens the transmission chain and optimizes the power distribution path, thereby reducing energy consumption, axle weight, and volume, and facilitating vehicle layout. The two electric drive modules 1 drive the two half-shafts respectively. By adjusting the number of motors involved in driving and the output power of the motors in the two electric drive modules 1, an electronic differential is formed, improving the accuracy of inter-wheel power distribution under complex road conditions and enhancing the vehicle's road adaptability.

[0017] The coupling assembly 5 includes a constant meshing shaft 51 and an input shaft 52 parallel to the constant meshing shaft 51. The shaft end of one motor 1 is connected to the constant meshing shaft 51, and the shaft ends of the other motors 1 are respectively connected to the input shaft 52. The input shaft 52 is located on the outer periphery of the constant meshing shaft 51. A constant meshing gear 53 is fixed on the constant meshing shaft 51, and an input gear 54 meshing with the constant meshing gear 53 is fixed on the input shaft 52. The outer diameter of the constant meshing gear 53 is larger than the outer diameter of the input gear 54. The constant meshing shaft 51 is connected to the input end of the reduction assembly 6. The motors connected to the constant meshing shaft 51 directly drive the constant meshing shaft 51 to rotate. The constant meshing gear 53 meshes with the input gear 54, coupling the power of the other motors to the constant meshing shaft 51, so that the power of multiple motors converges on the constant meshing shaft 51 and is transmitted to the reduction assembly 6. The coupling assembly 5 adopts a parallel shaft structure with the input shaft 51 and the constant meshing shaft 51 cooperating, which is simple in structure and has high transmission efficiency.

[0018] The reduction assembly 6 includes a sun gear 61 coaxially connected to the constant meshing shaft 51, a planet carrier 62, a planet shaft 63 rotatably mounted on the planet carrier 62, a first planet gear 64 meshing with the sun gear 61 and fixed on the planet shaft 63, a gear ring 65 fixed to the bridge housing, and a second planet gear 66 meshing with the gear ring 65 and fixed on the planet shaft 63. The outer diameter of the second planet gear 66 is smaller than the outer diameter of the first planet gear 64. The output end of the planet carrier 62 is connected to the half shaft 2. The constant meshing shaft 51 drives the sun gear 61 to rotate, the sun gear 61 drives the first planet gear 64, the first planet gear 64 drives the planet shaft 63 and the second planet gear 66 to rotate synchronously, the second planet gear 66 rotates in the gear ring 65, drives the planet carrier 62 to rotate, the planet carrier 62 transmits power to the half shaft 2, the half shaft 2 drives the wheel end planetary gear set 3 to rotate, realizing wheel end drive. The reduction assembly 6 adopts a high-speed planetary gear set with two planetary gears, which has compact torque distribution characteristics. It can improve the speed ratio and improve the reduction and torque increase characteristics without increasing the axial dimension, ensuring the structural compactness of the electric drive bridge.

[0019] The sun gear 61, the constant meshing shaft 51, and the constant meshing gear 53 are integrally formed. This improves the stability and reliability of the transmission structure and ensures that the power of the coupling assembly 5 is efficiently transmitted to the reduction assembly 6.

[0020] The electric drive module 1 contains three motors 4. Each half-shaft 2 is driven by the combined power of up to three motors, which is suitable for heavy-duty truck electric drive axles and meets the power requirements of large-tonnage trucks.

[0021] The technical solutions of the embodiments of this utility model have been fully described above with reference to the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

Claims

1. A symmetrical electronic differential drive axle, comprising two drive modules, a half-shaft connected to the output end of the drive modules, and a planetary gear set mounted on the end of the half-shaft, characterized in that: The electric drive module is coaxially aligned with the half-shaft, and the two electric drive modules are arranged in a mirror symmetrical manner between the two half-shafts. The electric drive module includes multiple motors, a coupling component that couples the power of the multiple motors, and a reduction component that is coaxially connected to the coupling component. The half-shaft is connected to the output end of the reduction component. The coupling component is a parallel shaft structure, and the reduction component is a planetary reduction structure.

2. The symmetrical electronic differential drive bridge according to claim 1, characterized in that: The coupling assembly includes a constant meshing shaft and an input shaft parallel to the constant meshing shaft. The shaft end of one motor is connected to the constant meshing shaft, and the shaft ends of the other motors are respectively connected to the input shaft. The input shaft is set on the outer periphery of the constant meshing shaft. A constant meshing gear is fixed on the constant meshing shaft, and an input gear that meshes with the constant meshing gear is fixed on the input shaft. The outer diameter of the constant meshing gear is larger than the outer diameter of the input gear. The constant meshing shaft is connected to the input end of the reduction assembly.

3. The symmetrical electronic differential drive bridge according to claim 2, characterized in that: The reduction assembly includes a sun gear coaxially connected to the constant meshing shaft, a planet carrier, a planet shaft rotatably mounted on the planet carrier, a first planet gear meshing with the sun gear and fixed on the planet shaft, a gear ring fixed to the bridge housing, and a second planet gear meshing with the gear ring and fixed on the planet shaft. The outer diameter of the second planet gear is smaller than that of the first planet gear. The output end of the planet carrier is connected to the half shaft.

4. The symmetrical electronic differential drive bridge according to claim 3, characterized in that: The sun gear, constant mesh shaft, and constant mesh gear are integrally formed.

5. The symmetrical electronic differential drive bridge according to claim 1, characterized in that: The electric drive module contains three motors.

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