Dual-motor three-gear heavy truck electric drive axle

Abstract

The invention provides a double-motor three-gear electric drive axle of a heavy truck. According to the double-motor three-gear 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 input assembly is provided with a first gear shifting mechanism, each middle assembly is provided with a second gear shifting mechanism, and each middle assembly is connected with the corresponding output assembly. According to the double-motor three-gear electric drive axle for the heavy truck, the problem that an existing three-gear electric drive axle for the heavy truck is difficult to meet use requirement indexes is solved.

Description

Technical Field

[0001] The present invention relates to the field of electric drive axles, and in particular to a dual-motor three-speed heavy-duty truck electric drive axle. Background Art

[0002] New energy commercial vehicles are rapidly developing and experiencing explosive market demand, but existing technologies face challenges such as short battery life and insufficient power. Traditional electric axle transmissions with single or two gears are inefficient, with climbing grades of less than 20% in mountainous areas, making them incapable of meeting heavy load requirements. A three-speed transmission solution could address these challenges, but it suffers from numerous parts, low transmission efficiency, and increased costs, making it difficult to achieve the key performance goals of lightweight integration, fatigue resistance, high torque, and high efficiency across all operating conditions. Summary of the Invention

[0003] In order to solve the problem that the existing three-speed electric drive axle for heavy trucks is difficult to meet the usage demand indicators, the present invention provides a dual-motor three-speed electric drive axle for heavy trucks that solves the above problem.

[0004] A dual-motor, three-speed heavy-duty truck electric drive axle comprises two sets of drive mechanisms connected to the same output assembly. The drive mechanisms include an input assembly and an intermediate assembly connected in sequence. The input assembly is provided with a first shifting mechanism, the intermediate assembly is provided with a second shifting mechanism, and the intermediate assembly is connected to the output assembly.

[0005] In a preferred embodiment of the dual-motor three-speed heavy-duty truck electric drive bridge provided by the present invention, the input assembly includes a motor, an input shaft, a third-speed gear, a large input gear, and a small input gear. The main shaft of the motor is connected to the input shaft, the third-speed gear is slidably arranged on the input shaft, and the large input gear and the small input gear are fixedly arranged on the input shaft.

[0006] The intermediate assembly includes an intermediate shaft, front intermediate gears, rear intermediate gears, first gear gears, and second gear gears. The front intermediate gears and rear intermediate gears are fixedly mounted on the intermediate shaft, while the first gear gears and second gear gears are slidably mounted on the intermediate shaft. The third gear gears mesh with the front intermediate gears, the large input gears mesh with the second gear gears, and the small input gears mesh with the first gear gears.

[0007] In a preferred embodiment of the dual-motor, three-speed heavy-duty truck electric drive axle provided by the present invention, the output assembly includes an output shaft and output teeth. The output teeth are fixedly mounted on the output shaft, and the rear intermediate teeth mesh with the output teeth. The output shaft is a differential output shaft, comprising a differential and left and right axle shafts connected to the differential. The output teeth are mounted on the differential housing.

[0008] In a preferred embodiment of the dual-motor three-speed heavy-duty truck electric drive axle provided by the present invention, the first shift mechanism is provided on the input shaft, and when the first shift mechanism is switched to the first gear, the third gear gear is connected to the input shaft.

[0009] The second shift mechanism is provided on the intermediate shaft, between the first gear teeth and the second gear teeth. When the second shift mechanism is switched to the first gear, the first gear teeth are connected to the intermediate shaft. When the second shift mechanism is switched to the second gear, the second gear teeth are connected to the intermediate shaft.

[0010] In a preferred embodiment of the dual-motor three-speed heavy-duty truck electric drive axle provided by the present invention, the first shift mechanisms in the two groups of drive mechanisms are switched synchronously, and the second shift mechanisms in the two groups of drive mechanisms are switched synchronously.

[0011] In a preferred embodiment of the dual-motor three-speed heavy-duty truck electric drive axle provided by the present invention, when the first shift mechanism is switched to neutral and the second shift mechanism is switched to first gear, it is the first gear of the drive axle system; when the first shift mechanism is switched to neutral and the second shift mechanism is switched to second gear, it is the second gear of the drive axle system; when the first shift mechanism is switched to first gear and the second shift mechanism is switched to neutral, it is the third gear of the drive axle system.

[0012] Compared with the prior art, the dual-motor three-speed heavy-duty truck electric drive axle provided by the present invention has the following beneficial effects: 1. The solution provided by this invention utilizes a dual-motor and three-speed design, providing powerful power support while allowing the electric drive axle to operate within the motor's high-efficiency range, improving overall operating efficiency and meeting vehicle performance requirements. During operation, gear shifting can be achieved without power interruption.

[0013] 2. The solution provided by the present invention adopts an integrated design, arranging the direct gear shift mechanism in the input component, taking into account the advantages of lightweight integration, high transmission efficiency and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is the schematic diagram of the electric drive axle of a dual-motor three-speed heavy-duty truck.

[0015] Reference numerals in the figure: motor 11, input shaft 12, third gear gear 13, large input gear 14, small input gear 15, intermediate shaft 21, front intermediate gear 22, rear intermediate gear 23, first gear gear 24, second gear gear 25, differential 31, left half shaft 32, right half shaft 33, output gear 34, first gear shift mechanism 4, second gear shift spline 5. DETAILED DESCRIPTION

[0016] 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.

[0017] See also Figure 1, is a schematic diagram of the dual-motor, three-speed heavy-duty truck electric drive axle provided by the present invention. The dual-motor, three-speed heavy-duty truck electric drive axle comprises two input assemblies, two intermediate assemblies, and one output assembly. The input assemblies are provided with a first shift mechanism 4, and the intermediate assembly is provided with a second shift mechanism 5.

[0018] The input assembly includes a motor 11, an input shaft 12, a third-speed gear 13, a large input gear 14, and a small input gear 15. The main shaft of the motor 11 is connected to the input shaft 12. The third-speed gear 13 is slidingly mounted on the input shaft 12, and the large input gear 14 and small input gear 15 are fixedly mounted on the input shaft 12. A first shift mechanism 4 is located between the third-speed gear 13 and the large input gear 14 on the input shaft 12.

[0019] The intermediate assembly includes an intermediate shaft 21, front intermediate gears 22, rear intermediate gears 23, first gear gears 24, and second gear gears 25. Intermediate shaft 21 is parallel to input shaft 12. From left to right, the intermediate shaft 21 is provided with fixed front intermediate gears 22 and rear intermediate gears 23, and sliding second gear gears 25 and first gear gears 24. A second shift mechanism 5 is provided on the intermediate shaft 21 between the first gear gears 24 and the second gear gears 25.

[0020] The output assembly includes a differential 31, a left half-shaft 32, a right half-shaft 33, and output gears 34. The left half-shaft 32 and the right half-shaft 33 are connected to the differential 31 and are connected to the wheels for output. The output gears 34 are located in the housing of the differential 31.

[0021] The transmission comprises two sets of input assemblies and two sets of intermediate assemblies. The two intermediate assemblies are symmetrically positioned on either side of the output assembly, with the rear intermediate teeth 23 in each set meshing with the same output teeth 34. The two input assemblies are symmetrically positioned outside the two intermediate assemblies, each connected to the adjacent intermediate assembly. Specifically, the third gear teeth 13 mesh with the front intermediate teeth 22, the large input teeth 14 mesh with the second gear teeth 25, and the small input teeth 15 mesh with the first gear teeth 24.

[0022] The first shift mechanism 4 includes a shift spline fixedly provided on the input shaft 12 and a shift spline provided on the third gear tooth 13. The third gear tooth 13 is connected or disconnected to the input shaft 12 by connecting or disconnecting the two shift splines through the gear sleeve.

[0023] When the first shift mechanism 4 is switched to neutral, the power of the motor 11 is transmitted to the second shift mechanism 5 via the large input teeth 14 or the small input teeth 15 .

[0024] When the first shift mechanism 4 is switched to the first gear, the power of the motor 11 is transmitted to the differential 31 via the third gear gear 13 , the front middle gear 22 , the rear middle gear 23 , and the output gear 34 .

[0025] The second shift spline 5 includes a shift spline fixed to the intermediate shaft 21, as well as a first-speed spline and a second-speed spline located adjacent to the first-speed teeth 24 and second-speed teeth 25. The first-speed spline or the second-speed spline is connected to the shift spline via a gear sleeve, achieving transmission connection between the first-speed teeth 24 and the intermediate shaft 21, or between the second-speed teeth 25 and the intermediate shaft 21.

[0026] When the second shift spline 5 is switched to neutral, the power of the motor 11 is transmitted to the second shift mechanism 5 via the large input teeth 14 or the small input teeth 15 for idling.

[0027] When the second shift spline 5 is switched to the first gear, the power of the motor 11 is delivered to the differential 31 via the small input gear 15 , the first gear gear 24 , the rear intermediate gear 23 , and the output gear 34 .

[0028] When the second shift spline 5 is switched to the second gear, the power of the motor 11 is delivered to the differential 31 via the large input gear 14 , the second gear gear 25 , the rear intermediate gear 23 , and the output gear 34 .

[0029] The two first shift mechanisms 4 in the two input assemblies are switched synchronously, and the two second shift elements 5 in the two intermediate assemblies are switched synchronously.

[0030] When the dual-motor three-speed heavy-duty truck electric drive axle provided by the present invention is switched to first gear, the first shift mechanism 4 is switched to neutral, and the second shift spline 5 is switched to first gear.

[0031] When the dual-motor three-speed heavy-duty truck electric drive axle provided by the present invention is switched to the second gear, the first shift mechanism 4 is switched to the neutral gear, and the second shift spline 5 is switched to the second gear.

[0032] When the dual-motor three-speed heavy-duty truck electric drive axle provided by the present invention is switched to the third gear, the first shift mechanism 4 is switched to the first gear, and the second shift spline 5 is switched to the neutral gear.

[0033] 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 dual-motor, three-speed heavy-duty truck electric drive axle, comprising two drive mechanisms connected to the same output assembly, characterized by: The driving mechanism includes an input assembly and an intermediate assembly connected in sequence, the input assembly is provided with a first shifting mechanism, the intermediate assembly is provided with a second shifting mechanism, and the intermediate assembly is connected to the output assembly.

2. The dual-motor three-speed heavy-duty truck electric drive axle according to claim 1, characterized in that: The input assembly includes a motor, an input shaft, a third gear tooth, a large input tooth, and a small input tooth. The main shaft of the motor is connected to the input shaft. The third gear tooth is slidably arranged on the input shaft. The large input tooth and the small input tooth are fixedly arranged on the input shaft.

3. The dual-motor three-speed heavy-duty truck electric drive axle according to claim 2, characterized in that: The intermediate component includes an intermediate shaft, front intermediate gears, rear intermediate gears, first gear gears, and second gear gears. The front intermediate gears and the rear intermediate gears are fixedly arranged on the intermediate shaft, and the first gear gears and the second gear gears are slidably arranged on the intermediate shaft.

4. The dual-motor three-speed heavy-duty truck electric drive axle according to claim 3, characterized in that: The third gear teeth are engaged with the front intermediate teeth, the large input teeth are engaged with the second gear teeth, and the small input teeth are engaged with the first gear teeth.

5. The dual-motor three-speed heavy-duty truck electric drive axle according to claim 4, characterized in that: The output assembly includes an output shaft and output teeth. The output teeth are fixed to the output shaft, and the rear intermediate teeth are engaged with the output teeth.

6. The dual-motor three-speed heavy-duty truck electric drive axle according to claim 5, characterized in that: The output shaft is a differential output shaft, which includes a differential and left and right half shafts connected to the differential, and the output gear is provided on the housing of the differential.

7. The dual-motor three-speed heavy-duty truck electric drive axle according to any one of claims 2 to 6, characterized in that: The first shift mechanism is provided on the input shaft. When the first shift mechanism is switched to the first gear, the third gear gear is connected to the input shaft.

8. The dual-motor three-speed heavy-duty truck electric drive axle according to claim 7, characterized in that: The second shift mechanism is provided on the intermediate shaft, between the first gear teeth and the second gear teeth. When the second shift mechanism is switched to the first gear, the first gear teeth are connected to the intermediate shaft. When the second shift mechanism is switched to the second gear, the second gear teeth are connected to the intermediate shaft.

9. The dual-motor three-speed heavy-duty truck electric drive axle according to claim 8, characterized in that: The first shift mechanisms in the two groups of drive mechanisms are switched synchronously, and the second shift mechanisms in the two groups of drive mechanisms are switched synchronously.

10. The dual-motor three-speed heavy-duty truck electric drive axle according to claim 9, characterized in that: When the first shift mechanism is switched to neutral and the second shift mechanism is switched to first gear, it is the first gear of the drive axle system; when the first shift mechanism is switched to neutral and the second shift mechanism is switched to second gear, it is the second gear of the drive axle system; when the first shift mechanism is switched to first gear and the second shift mechanism is switched to neutral, it is the third gear of the drive axle system.

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