Three-gear electric drive axle structure suitable for heavy truck

Abstract

The invention provides a three-gear electric drive axle structure suitable for a heavy truck. The three-gear electric drive axle structure suitable for the heavy truck comprises two input assemblies, a first middle assembly, a second middle assembly and an output assembly, the first middle assembly and the second middle assembly are connected with the two input assemblies respectively, the output assembly is connected with the first middle assembly and the second middle assembly at the same time, and the first middle assembly comprises a first middle shaft and an idler shaft. The first intermediate shaft is provided with a first gear shifting assembly, and the second intermediate assembly comprises a second intermediate shaft and is provided with a second gear shifting assembly. According to the three-gear electric drive axle structure suitable for the heavy truck, the defects that an existing three-gear electric drive axle is large in number of parts, complex in system and the like are overcome.

Description

Technical Field

[0001] The present invention relates to the field of electric drive axles, and in particular to a three-speed electric drive axle structure suitable for heavy trucks. Background Art

[0002] Highly integrated electric drive axles are increasingly being used in commercial vehicles. Their development aims to balance integration, lightweighting, gradeability, and high-speed driving requirements. Three-speed designs can meet the gradeability and high-speed driving demands of heavy-duty trucks. However, existing three-speed electric drive axles typically utilize a separate shift mechanism for the third gear. This results in numerous parts, complex systems, and inaccurate shift control, making it difficult to achieve both integration and lightweighting. Summary of the Invention

[0003] In order to solve the defects of the existing three-speed electric drive axle such as many parts and complex system, the present invention provides a three-speed electric drive axle structure suitable for heavy trucks that solves the above problems.

[0004] A three-speed electric drive axle structure suitable for heavy trucks includes two input assemblies, which are respectively connected to a first intermediate assembly and a second intermediate assembly of the two input assemblies, and are simultaneously connected to the output assemblies of the first intermediate assembly and the second intermediate assembly, the first intermediate assembly includes a first intermediate shaft and an idler shaft, the first intermediate shaft is provided with a first shift assembly, when the first shift assembly is in first gear, the input assembly, the idler shaft, the first shift assembly, the first intermediate shaft, and the output assembly are connected in sequence, when the first shift assembly is in second gear, the input assembly, the first shift assembly, the first intermediate shaft, and the output assembly are connected in sequence, the second intermediate assembly includes a second intermediate shaft and is provided with a second shift assembly, the input assembly, the second shift mechanism, the second intermediate shaft, and the output assembly are connected in sequence.

[0005] In a preferred embodiment of the three-speed electric drive axle structure suitable for heavy trucks provided by the present invention, the input assembly includes a first input assembly and a second input assembly, the first input assembly includes a first motor and a first input tooth provided on the first motor main shaft; the second input assembly includes a second motor and a second input tooth and a third input tooth provided on the second motor main shaft; the first input tooth is connected to the first intermediate assembly; the second input tooth and the third input tooth are connected to the second intermediate assembly.

[0006] In a preferred embodiment of a three-speed electric drive axle structure suitable for heavy-duty trucks provided by the present invention, the first intermediate assembly further includes a first first-speed gear, a second second-speed gear, a small idler gear, and a large idler gear. The first first-speed gear and the second second-speed gear are slidably mounted on the first intermediate shaft, and the small idler gear and the large idler gear are fixedly mounted on the idler shaft. The first input gear, the second second-speed gear, and the large idler gear engage in sequence, with the first first-speed gear meshing with the small idler gear. The second intermediate assembly further includes a second first-speed gear and a second second-speed gear. The second first-speed gear and the second second-speed gear are slidably mounted on the second intermediate shaft and mesh with the second input gear and the third input gear, respectively.

[0007] In a preferred embodiment of a three-speed electric drive axle structure suitable for heavy trucks provided by the present invention, the first shift mechanism is disposed between the first first-speed gear and the second second-speed gear. When the first shift mechanism is shifted to first gear, the first first-speed gear is connected to the first intermediate shaft. When the first shift mechanism is shifted to second gear, the second second-speed gear is connected to the front intermediate shaft. The second shift mechanism is disposed between the second first-speed gear and the second second-speed gear. When the second shift mechanism is shifted to first gear, the second first-speed gear is connected to the second intermediate shaft. When the second shift mechanism is shifted to second gear, the second second-speed gear is connected to the second intermediate shaft.

[0008] In a preferred embodiment of the three-speed electric drive axle structure suitable for heavy trucks provided by the present invention, when the first shift mechanism is switched to first gear and the second shift mechanism is switched to first gear, it is the first gear of the drive axle; when the first shift mechanism is switched to second gear and the second shift mechanism is switched to first gear, it is the second gear of the drive axle; when the first shift mechanism is switched to second gear and the second shift mechanism is switched to second gear, it is the third gear of the drive axle.

[0009] In a preferred embodiment of a three-speed electric drive axle structure suitable for heavy trucks provided by the present invention, the output assembly includes an output shaft and output teeth disposed on the output shaft. 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 disposed on the differential housing. The first and second intermediate shafts are respectively provided with first and second intermediate teeth that mesh with the output teeth.

[0010] Compared with the prior art, the three-speed electric drive axle structure suitable for heavy trucks provided by the present invention has the following beneficial effects: 1. The solution provided by this invention adopts a three-speed design, allowing the electric drive axle to operate in the motor's high-efficiency range, improving overall operating efficiency. The overall comprehensive efficiency is high, and the performance requirements of the entire vehicle are fully met. 1st gear meets high torque, and 3rd gear meets maximum speed.

[0011] 2. The solution provided by the present invention adopts a dual-motor design, which has strong power support. During operation, gear shifting can be achieved without power interruption.

[0012] 3. The solution provided by the present invention adopts two sets of shifting mechanisms and an asymmetric intermediate component structure to achieve three gear positions, taking into account the requirements of integration and lightweight. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the three-speed electric drive axle structure suitable for heavy trucks.

[0014] Reference numerals in the figure: first motor 11, first input shaft 12, first input tooth 13, second motor 21, second input shaft 22, second input tooth 23, third input tooth 24, first intermediate shaft 31, first first gear tooth 32, second second gear tooth 33, first intermediate gear 34, idler shaft 35, small idler gear tooth 36, large idler gear tooth 37, second intermediate shaft 41, second first gear tooth 42, second second gear tooth 43, second intermediate gear 44, differential 51, left half shaft 52, right half shaft 53, output tooth 54, first gear shift mechanism 6, second gear shift mechanism 7. DETAILED DESCRIPTION

[0015] 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.

[0016] See also Figure 1 , is a schematic diagram of a three-speed electric drive axle structure suitable for heavy trucks provided by the present invention. The three-speed electric drive axle structure suitable for heavy trucks includes a first input component, a second input component, a first intermediate component, a second intermediate component, and an output component.

[0017] The first input assembly includes a first motor 11 , a first input shaft 12 , and first input teeth 13 . The main shaft of the first motor 11 is connected to the first input shaft 12 and is provided with the first input teeth 13 .

[0018] The first intermediate assembly includes a first intermediate shaft 31 , a first first gear tooth 32 , a second second gear tooth 33 , a first intermediate tooth 34 , an idler shaft 35 , small idler teeth 36 , and large idler teeth 37 .

[0019] The first intermediate shaft 31 is provided with a first first gear tooth 32 and a second second gear tooth 33 for sliding movement, and is fixedly provided with a first intermediate tooth 34. The idler shaft 35 is fixedly provided with a small idler tooth 36 and a large idler tooth 37.

[0020] The second second gear teeth 33 are duplex gears, the larger diameter side of which meshes with the first input teeth 13 , and the smaller diameter side of which meshes with the larger idler gear teeth 27 . The smaller idler gear teeth 36 mesh with the first first gear teeth 32 .

[0021] The first shift mechanism 6 is located on the first intermediate shaft 31, between the first first-speed tooth 32 and the second second-speed tooth 33. The first shift mechanism 6 includes a shift spline fixed to the first intermediate shaft 31, as well as a first-speed spline and a second-speed spline, respectively, located on the first first-speed tooth 32 and the first second-speed tooth 33. The first first-speed tooth 32 or the first second-speed tooth 33 is connected to the first intermediate shaft 31 by switching the first-speed spline or the second-speed spline with the shift spline via a gear sleeve.

[0022] When the first shift mechanism 6 switches to first gear, the gear sleeve moves to the right position, and the power of the first motor 11 passes through the first input gear 13, the second second gear gear 33, the large idler gear gear 27, the small idler gear gear 36, and the first first gear gear 32 to the first intermediate shaft 31 in sequence.

[0023] When the first shift mechanism 6 is switched to the second gear, the gear sleeve moves to the left position, and the power of the first motor 11 is transmitted to the first intermediate shaft 31 through the first input gear 13 and the second second gear gear 33 in sequence.

[0024] The second input assembly includes a second motor 21, a second input shaft 22, second input teeth 23, and third input teeth 24. The main shaft of the second motor 21 is connected to the second input shaft 22 and is provided with the second input teeth 23 and the third input teeth 24.

[0025] The second intermediate assembly includes a second intermediate shaft 41, a second first-speed gear 42, a second second-speed gear 43, and a second intermediate gear 44. The second first-speed gear 42 and the second second-speed gear 43 are slidably mounted on the second intermediate shaft 41, while the second intermediate gear 44 is fixedly mounted. The second first-speed gear 42 meshes with the second input gear 23, while the second second-speed gear 43 meshes with the third input gear 24.

[0026] The second shift mechanism 7 is mounted on the second intermediate shaft 41 and includes a shift spline fixed to the second intermediate shaft 41, as well as a first-speed spline and a second-speed spline, respectively, mounted on the second first-speed gear 42 and the second second-speed gear 43. The first-speed spline or the second-speed spline is connected to the shift spline by a gear sleeve, thereby connecting the second first-speed gear 42 or the second second-speed gear 43 to the second intermediate shaft 41.

[0027] When the second shift mechanism 7 is switched to the first gear, the gear sleeve moves to the right position, and the power of the second motor 21 is sequentially transmitted through the second input gear 23 and the second first gear gear 4 to the second intermediate shaft 41.

[0028] When the second shift mechanism 7 is switched to the second gear, the gear sleeve moves to the left position, and the power of the second motor 21 is sequentially transmitted through the third input gear 24 and the second second gear gear 43 to the second intermediate shaft 41 .

[0029] The output assembly includes a differential 51, a left halfshaft 52, a right halfshaft 53, and an output gear 54. The left and right halfshafts 52 and 53 are connected to the differential 51 and provide output to the left and right wheels, respectively. The output gear 54 is located in the housing of the differential 51 and meshes with both the first and second intermediate gears 34 and 44.

[0030] When the electric drive axle is switched to first gear, the first shift mechanism 6 is switched to first gear, and the second shift mechanism 7 is switched to first gear: At this time, the power of the first motor 11 passes through the first input gear 13, the second second gear gear 33, the large idler gear gear 27, the small idler gear gear 36, the first first gear gear 32, the first intermediate shaft 31, the first intermediate gear 34, to the output gear 54 and the differential 51; The power of the second motor 21 passes through the second input gear 23 , the second first gear gear 4 , the second intermediate shaft 41 , the second intermediate gear 44 , and reaches the output gear 54 and the differential 51 .

[0031] When the drive axle is switched to the second gear, the first shift mechanism 6 is switched to the second gear and the second shift mechanism 7 is switched to the first gear: At this time, the power of the first motor 11 passes through the first input gear 13, the second second gear gear 33, the first intermediate shaft 31, the first intermediate gear 34, and the output gear 54 and the differential 51 in sequence; The power of the second motor 21 passes through the second input gear 23 , the second first gear gear 4 , the second intermediate shaft 41 , the second intermediate gear 44 , and reaches the output gear 54 and the differential 51 .

[0032] When the drive axle is switched to the third gear, the first shift mechanism 6 is switched to the second gear, and the second shift mechanism 7 is switched to the second gear: At this time, the power of the first motor 11 passes through the first input gear 13, the second second gear gear 33, the first intermediate shaft 31, the first intermediate gear 34, and the output gear 54 and the differential 51 in sequence; The power of the second motor 21 passes through the third input gear 24 , the second second-speed gear 43 , the second intermediate shaft 41 , the second intermediate gear 44 , and reaches the output gear 54 and the differential 51 .

[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 three-speed electric drive axle structure suitable for heavy trucks, characterized by: The invention comprises two input assemblies, which are respectively connected to a first intermediate assembly and a second intermediate assembly of the two input assemblies, and are also connected to output assemblies of the first intermediate assembly and the second intermediate assembly. The first intermediate assembly comprises a first intermediate shaft and an idler shaft. The first intermediate shaft is provided with a first shift assembly. When the first shift assembly is in first gear, the input assembly, the idler shaft, the first shift assembly, the first intermediate shaft, and the output assembly are connected in sequence. When the first shift assembly is in second gear, the input assembly, the first shift assembly, the first intermediate shaft, and the output assembly are connected in sequence. The second intermediate assembly comprises a second intermediate shaft and is provided with a second shift assembly. The input assembly, the second shift mechanism, the second intermediate shaft, and the output assembly are connected in sequence.

2. The three-speed electric drive axle structure suitable for heavy trucks according to claim 1 is characterized in that: The input assembly includes a first input assembly and a second input assembly. The first input assembly includes a first motor and a first input tooth provided on the main shaft of the first motor; the second input assembly includes a second motor and a second input tooth and a third input tooth provided on the main shaft of the second motor; the first input tooth is connected to the first intermediate assembly; the second input tooth and the third input tooth are connected to the second intermediate assembly.

3. The three-speed electric drive axle structure suitable for heavy trucks according to claim 2 is characterized in that: The first intermediate component further includes a first first gear tooth, a second second gear tooth, a small idler gear tooth and a large idler gear tooth. The first first gear tooth and the second second gear tooth are slidably arranged on the first intermediate shaft, and the small idler gear tooth and the large idler gear tooth are fixedly arranged on the idler shaft; the first input tooth, the second second gear tooth and the large idler gear tooth are meshed in sequence, and the first first gear tooth and the small idler gear tooth are meshed.

4. The three-speed electric drive axle structure suitable for heavy trucks according to claim 3 is characterized by: The second intermediate assembly further includes a second first gear tooth and a second second gear tooth. The second first gear tooth and the second second gear tooth are slidably disposed on the second intermediate shaft and mesh with the second input tooth and the third input tooth, respectively.

5. The three-speed electric drive axle structure suitable for heavy trucks according to claim 4 is characterized in that: The first shift mechanism is provided between the first first-gear tooth and the second second-gear tooth. When the first shift mechanism is switched to first gear, the first first-gear tooth is connected to the first intermediate shaft. When the first shift mechanism is switched to second gear, the second second-gear tooth is connected to the first intermediate shaft.

6. The three-speed electric drive axle structure suitable for heavy trucks according to claim 5 is characterized in that: The second shift mechanism is provided between the second first-gear tooth and the second second-gear tooth. When the second shift mechanism is switched to first gear, the second first-gear tooth is connected to the second intermediate shaft. When the second shift mechanism is switched to second gear, the second second-gear tooth is connected to the second intermediate shaft.

7. The three-speed electric drive axle structure suitable for heavy trucks according to claim 6 is characterized in that: When the first shift mechanism switches to first gear and the second shift mechanism switches to first gear, it is the first gear of the drive axle; when the first shift mechanism switches to second gear and the second shift mechanism switches to first gear, it is the second gear of the drive axle; when the first shift mechanism switches to second gear and the second shift mechanism switches to second gear, it is the third gear of the drive axle.

8. The three-speed electric drive axle structure suitable for heavy trucks according to claim 1 is characterized by: The output assembly includes an output shaft and output teeth provided on the output shaft.

9. The three-speed electric drive axle structure suitable for heavy trucks according to claim 8, 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 output gear is provided on the housing of the differential.

10. The three-speed electric drive axle structure for heavy trucks according to claim 8 or 9, characterized in that: The first intermediate shaft and the second intermediate shaft are respectively provided with first intermediate teeth and second intermediate teeth engaged with the output teeth.

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