Four-motor heavy truck electric drive axle

Abstract

The invention provides an electric drive axle of a four-motor heavy truck. According to the four-motor heavy truck electric drive axle, two sets of driving mechanisms are connected into the same output assembly, each driving mechanism comprises an input assembly and a middle assembly which are sequentially connected, each middle assembly is provided with a gear shifting mechanism, each output assembly comprises a high-speed tooth and a low-speed tooth, and the high-speed teeth and the low-speed teeth are connected with the middle assemblies of the two sets of driving mechanisms at the same time. The four-motor heavy truck electric drive axle provided by the invention overcomes the defects of high cost, poor scene adaptability and the like generally existing in such products in the market at present.

Description

Technical Field

[0001] The present invention relates to the field of electric drive axles, and in particular to a four-motor electric drive axle for heavy-duty trucks. Background Art

[0002] The electrification of commercial vehicles is accelerating, and electric drive systems are being upgraded toward higher power density and higher reliability. Due to the high power demands of heavy-duty trucks and other commercial vehicles, traditional electric drive solutions for heavy-duty trucks present significant drawbacks: the high cost of high-power dedicated motors, efficiency losses in single-motor drive systems under complex operating conditions, and complex transmission chains resulting from multi-speed gearboxes. For the 30-49 ton heavy-duty truck market, an electric drive axle system with multiple motors and a two-speed mechanism better meets market demand. However, currently available products of this type suffer from high costs and poor adaptability to various scenarios. Summary of the Invention

[0003] In order to solve the defects of the existing heavy-duty truck multi-motor electric drive axle system such as high cost and poor scene adaptability, the present invention provides a four-motor heavy-duty truck electric drive axle that solves the above problems.

[0004] A four-motor heavy-duty truck electric drive axle includes two sets of drive mechanisms connected to the same output component. The drive mechanism includes an input component and an intermediate component connected in sequence. The intermediate component is provided with a shift mechanism. The output component includes high-speed teeth and low-speed teeth, both of which are simultaneously connected to the intermediate components in the two sets of the drive mechanisms.

[0005] In a preferred embodiment of the four-motor heavy-duty truck electric drive axle provided by the present invention, the input assembly includes a motor, an input shaft and input teeth, the main shaft of the motor is connected to the input shaft, and the input teeth are fixed to the input shaft.

[0006] In a preferred embodiment of the four-motor heavy-duty truck electric drive axle provided by the present invention, the intermediate component includes an intermediate shaft, a first intermediate tooth fixedly arranged on the intermediate shaft, and a first gear tooth and a second gear tooth slidably arranged on the intermediate shaft; the first intermediate tooth is engaged with the input tooth, and the first gear tooth and the second gear tooth are connected to the output component.

[0007] In a preferred embodiment of the four-motor heavy-duty truck electric drive axle provided by the present invention, the axle includes two sets of input assemblies. The intermediate assembly further includes second intermediate teeth fixedly mounted on the intermediate shaft. The first and second intermediate teeth respectively mesh with two input teeth in the two sets of input assemblies. The first and second gear teeth are located in the middle of the intermediate shaft, while the first and second intermediate teeth are located at opposite ends of the intermediate shaft.

[0008] In a preferred embodiment of the four-motor heavy-duty truck electric drive axle provided by the present invention, the input component is arranged between the intermediate component and the output component.

[0009] In a preferred embodiment of the four-motor heavy-duty truck electric drive axle provided by the present invention, the output assembly includes an output shaft, high-speed teeth and low-speed teeth fixed to the output shaft, which respectively mesh with the second-gear teeth and the first-gear teeth. The output shaft is a differential output shaft, including a differential and left and right half shafts connected to the differential. The high-speed teeth and low-speed teeth are both located in the differential housing.

[0010] In a preferred embodiment of the four-motor heavy-duty truck electric drive axle provided by the present invention, the shift mechanism is disposed on the intermediate shaft, located between the first-gear teeth and the second-gear teeth. When the shift mechanism is shifted to first gear, the first-gear teeth are connected to the intermediate shaft, and when the shift mechanism is shifted to second gear, the second-gear teeth are connected to the intermediate shaft. The shift mechanisms in the two sets of the drive mechanisms are shifted synchronously.

[0011] Compared with the prior art, the four-motor heavy-duty truck electric drive axle provided by the present invention has the following beneficial effects: 1. The solution proposed in this invention utilizes a four-motor design. By controlling these four motors, precise torque distribution is achieved, optimizing overall efficiency and eliminating the single-point failure risk of traditional solutions. The modular design facilitates single-unit replacement, reducing maintenance costs and eliminating the need to return the entire axle to the factory.

[0012] 2. The solution provided by this invention adopts a two-speed design, which improves the overall working efficiency. The dual-speed plus four-motor power combination mode covers all working conditions such as hill starting and high-speed cruising.

[0013] 3. The solution provided by the present invention can be applied to the 800V SiC electric drive platform of passenger cars, adopt the passenger car motor industry chain, and be produced on the same line as passenger car motors, thereby reducing costs.

[0014] 4. The solution provided by the present invention adopts an optimized structural layout, making the overall structure of the electric drive bridge more compact and occupying less space; the number of transmission gears is reduced and the transmission efficiency is increased; and the four motors adopt a symmetrical and balanced layout, which makes the load-bearing capacity of the electric drive bridge higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the electric drive axle of a four-motor heavy-duty truck in Example 1; Figure 2 This is the schematic diagram of the electric drive axle of the four-motor heavy-duty truck in Example 2.

[0016] Reference numerals in the figure: motor 11, input shaft 12, input gear 13, intermediate shaft 21, first intermediate gear 22, second intermediate gear 23, first gear gear 24, second gear gear 25, differential 31, left half shaft 32, right half shaft 33, high-speed gear 34, low-speed gear 35, shift mechanism 4. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0018] Example 1: Please refer to Figure 1 , is a schematic diagram of the four-motor heavy-duty truck electric drive axle provided by the present invention in this embodiment.

[0019] The electric drive axle of a four-motor heavy-duty truck includes four input components, two intermediate components and one output component, and a shift mechanism 4 is provided in the intermediate component.

[0020] The input assembly includes a motor 11 , an input shaft 12 and input teeth 13 . The main shaft of the motor 11 is connected to the input shaft 12 , and the input teeth 13 are fixed to the input shaft 12 .

[0021] The intermediate assembly includes an intermediate shaft 21, first intermediate gears 22, second intermediate gears 23, first gear gears 24, and second gear gears 25. The intermediate shaft 21 is provided with first gear gears 24 and second gear gears 25 at the middle where they slide, and with first intermediate gears 22 and second intermediate gears 23 at the two ends where they are fixed.

[0022] The output assembly includes a differential 31, a left halfshaft 32, a right halfshaft 33, high-speed gears 34, and low-speed gears 35. The left and right halfshafts 32 and 33 are connected to the differential 31 and are connected to the left and right wheel outputs, respectively. Both the high-speed gears 34 and the low-speed gears 35 are located in the housing of the differential 31.

[0023] Two intermediate assemblies are included. The two first-speed teeth 24 in the two intermediate assemblies are meshed with the same low-speed tooth 35 , and the two second-speed teeth 25 are meshed with the same high-speed tooth 34 .

[0024] It comprises four input assemblies, wherein the two input teeth 13 in two of the input assemblies are respectively engaged with the first intermediate tooth 22 and the second intermediate tooth 23 in one intermediate assembly; the two input teeth 13 in the other two input assemblies are engaged with another intermediate assembly.

[0025] The shift mechanism 4 is located between the first-gear teeth 24 and the second-gear teeth 25 on the intermediate shaft 21. It includes a shift spline fixed to the intermediate shaft 21, as well as first-gear and second-gear splines, respectively, located on the first-gear teeth 24 and second-gear teeth 25. A gear sleeve switches the first-gear spline or the second-gear spline to the shift spline, connecting the first-gear teeth 24 or the second-gear teeth 25 to the intermediate shaft 21.

[0026] When the shift mechanism 4 shifts to first gear, the gear sleeve moves to the right, and the first gear gear 24 connects to the intermediate shaft 21. The power from the motors 11 in the two input assemblies on the same side is transmitted sequentially through the input gears 13, the first intermediate gear 22 or the second intermediate gear 23, the intermediate shaft 21, the first gear gear 24, and the low-speed gear 35 to the differential 31, and ultimately output to the left and right half shafts 32 and 33.

[0027] When the shift mechanism 4 is switched to second gear, the gear sleeve moves to the left, and the second gear gear 25 connects to the intermediate shaft 21. The power from the motors 11 in the two input assemblies on the same side is transmitted sequentially through the input gears 13, the first intermediate gear 22 or the second intermediate gear 23, the intermediate shaft 21, the second gear gear 25, and the high-speed gear 34 to the differential 31, and ultimately output to the left and right half shafts 32 and 33.

[0028] The shift mechanisms 4 on the two intermediate shafts 21 operate synchronously, allowing the electric drive axle to have two gears. When the electric drive axle switches to first gear, the gear sleeves of the two shift mechanisms 4 move to the right position, and the power of the motor 11 in the four input components is transmitted from the low-speed gear 35 to the differential 31.

[0029] When the electric drive axle is switched to the second gear, the gear sleeves of the two shift mechanisms 4 move to the left position, and the power of the motor 11 in the four input components is transmitted from the high-speed gear 34 to the differential 31.

[0030] Example 2: Please refer to Figure 1 , is a schematic diagram of the four-motor heavy-duty truck electric drive axle provided by the present invention in this embodiment. The difference from Example 1 is: The two input components on the same side are arranged between the intermediate component and the output component, that is, the motor is arranged around the output shaft, making the structure of the electric drive axle system more compact.

[0031] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A four-motor heavy-duty truck electric drive axle, comprising two sets of drive mechanisms connected to the same output assembly, characterized by: The driving mechanism includes an input component and an intermediate component connected in sequence, the intermediate component is provided with a shift mechanism, and the output component includes high-speed teeth and low-speed teeth, both of which are simultaneously connected to the intermediate components in two groups of the driving mechanism.

2. The four-motor heavy-duty truck electric drive axle according to claim 1, characterized in that: The input assembly includes a motor, an input shaft and input teeth. The main shaft of the motor is connected to the input shaft, and the input teeth are fixed to the input shaft.

3. The four-motor heavy-duty truck electric drive axle according to claim 2, characterized in that: The intermediate assembly includes an intermediate shaft, a first intermediate tooth fixedly provided on the intermediate shaft, and a first gear tooth and a second gear tooth slidably provided on the intermediate shaft; the first intermediate tooth is engaged with the input tooth, and the first gear tooth and the second gear tooth are connected to the output assembly.

4. The four-motor heavy-duty truck electric drive axle according to claim 3, characterized in that: It comprises two groups of input assemblies, and the intermediate assembly further comprises a second intermediate tooth fixedly arranged on the intermediate shaft, and the first intermediate tooth and the second intermediate tooth are respectively engaged with two input teeth in the two groups of input assemblies.

5. The four-motor heavy-duty truck electric drive axle according to claim 4, characterized in that: The first gear teeth and the second gear teeth are arranged at the middle portion of the intermediate shaft, and the first intermediate teeth and the second intermediate teeth are arranged at both ends of the intermediate shaft.

6. The four-motor heavy-duty truck electric drive axle according to claim 5, characterized in that: The input component is arranged between the intermediate component and the output component.

7. The four-motor heavy-duty truck electric drive axle according to any one of claims 3 to 6, characterized in that: The output assembly includes an output shaft, a high-speed tooth and a low-speed tooth fixed to the output shaft, which are respectively engaged with the second-speed tooth and the first-speed tooth.

8. The four-motor heavy-duty truck electric drive axle according to claim 7, characterized in that: The output shaft is a differential output shaft, comprising a differential and left and right half shafts connected to the differential, and the high-speed gear and the low-speed gear are both arranged on the housing of the differential.

9. The four-motor heavy-duty truck electric drive axle according to any one of claims 3 to 6, characterized in that: The shift mechanism is provided on the intermediate shaft, and is located between the first gear teeth and the second gear teeth. When the shift mechanism is switched to the first gear, the first gear teeth are connected to the intermediate shaft. When the shift mechanism is switched to the second gear, the second gear teeth are connected to the intermediate shaft.

10. The four-motor heavy-duty truck electric drive axle according to claim 9, characterized in that: The shift mechanisms in the two groups of drive mechanisms are switched synchronously.

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