Four-gear electric drive axle with main motor and auxiliary motor

Abstract

The invention provides a four-gear electric drive axle with a main motor and an auxiliary motor. The main and auxiliary motor four-gear electric drive axle comprises a main input unit, an auxiliary input unit, a first middle unit, a second middle unit and an output unit, the main input unit, the first middle unit, the second middle unit and the output unit are sequentially connected, the auxiliary input unit is connected with the second middle unit, and the auxiliary input unit is connected with the second middle unit. The first middle unit is provided with a first gear shifting mechanism, and the second middle unit is provided with a second gear shifting mechanism. According to the four-gear electric drive axle with the main motor and the auxiliary motor, the problem that an existing electric drive axle cannot meet the use requirements of specific working conditions is solved.

Description

Technical Field

[0001] The present invention relates to the field of electric drive axles, and in particular to a four-speed electric drive axle with main and auxiliary motors. Background Art

[0002] The electrification of new energy commercial vehicles, especially heavy-duty tractors, is accelerating, particularly those using electric drive axles. To meet the heavy-load and long-distance transport demands of commercial vehicles, electric drive axles must have more gears and a more compact structure, enabling them to simultaneously meet multiple requirements, including low-speed torque, high-speed endurance, and adaptability to complex operating conditions. Existing electric drive axles generally use a two-gear structure, which is bulky and heavy, and cannot meet these requirements. Summary of the Invention

[0003] In order to solve the problem that the existing electric drive axle cannot meet the requirements of specific working conditions, the present invention provides a four-speed electric drive axle with main and auxiliary motors to solve the above problem.

[0004] A four-speed electric drive axle with main and auxiliary motors includes a main input unit, an auxiliary input unit, a first intermediate unit, a second intermediate unit, and an output unit. The main input unit, the first intermediate unit, the second intermediate unit, and the output unit are connected in sequence. The auxiliary input unit is connected to the second intermediate unit. The first intermediate unit is provided with a first shifting mechanism, and the second intermediate unit is provided with a second shifting mechanism.

[0005] In a preferred embodiment of the four-speed electric drive axle for main and auxiliary motors provided by the present invention, the first intermediate unit includes a first intermediate shaft, a first front tooth, a first duplex tooth, and a first rear tooth provided on the first intermediate shaft, the first front tooth being fixed, the first duplex tooth and the first rear tooth being rotatable, and the first front tooth being connected to the main input unit. The second intermediate unit includes a second intermediate shaft, a second duplex tooth, a second front tooth, and a second rear tooth provided on the second intermediate shaft, the second duplex tooth and the second front tooth being rotatable, the second rear tooth being fixed, and the second rear tooth being connected to the auxiliary input unit.

[0006] The large teeth in the first doublet teeth mesh with the small teeth in the second doublet teeth, the small teeth mesh with the second front teeth, and the large teeth in the second doublet teeth mesh with the first rear teeth.

[0007] In a preferred embodiment of the four-speed electric drive axle for main and auxiliary motors provided by the present invention, the first shifting mechanism is disposed on the first intermediate shaft between the first duplex teeth and the first rear teeth. When the first shifting mechanism is switched to first gear, the first intermediate shaft is connected to the first rear teeth. When the first shifting mechanism is switched to second gear, the first intermediate shaft is connected to the first duplex teeth. The second shifting mechanism is disposed on the second intermediate shaft between the second duplex teeth and the second front teeth. When the second shifting mechanism is switched to first gear, the second intermediate shaft is connected to the second duplex teeth. When the second shifting mechanism is switched to first gear, the second intermediate shaft is connected to the second duplex teeth. When the second shifting mechanism is switched to second gear, the second intermediate shaft is connected to the second front teeth.

[0008] In a preferred embodiment of the four-speed electric drive bridge of the main and auxiliary motors provided by the present invention, the main input unit includes a main motor and a main input tooth provided on the main motor shaft, and the auxiliary input unit includes an auxiliary motor and an auxiliary input tooth provided on the auxiliary motor shaft, the main input tooth engages with the first front tooth, and the auxiliary input tooth engages with the second rear tooth.

[0009] In a preferred embodiment of the four-speed electric drive axle for main and auxiliary motors provided by the present invention, the output unit includes a differential and left and right half-shafts connected to the differential, and the second intermediate shaft is connected to the differential housing. The output unit also includes an output planetary gear set, the sun gear of which is connected to the second intermediate shaft, and the planet carrier is connected to the differential housing. The output unit also includes wheel-side planetary gear sets, the sun gears of which are respectively connected to the ends of the left and right half-shafts.

[0010] Compared with the prior art, the four-speed electric drive axle with main and auxiliary motors provided by the present invention has the following beneficial effects: 1. The solution provided by this invention adopts a four-gear design, which has better scenario universality. It is suitable for a variety of scenarios such as heavy-load climbing, high-speed cruising, and complex road conditions, achieving higher efficiency and longer endurance, and is particularly suitable for long-distance transportation scenarios such as coal and cold chain.

[0011] 2. The solution provided by this invention utilizes a coordinated drive system with two main and auxiliary motors. The main motor (high power) and the auxiliary motor (high efficiency) work together through an intelligent torque distribution strategy to achieve efficient matching across the entire range. This also offers the advantage of efficient shifting. During the shift process, the auxiliary motor briefly provides the required torque and speed for the vehicle, enabling shifting without power interruption.

[0012] 3. The solution provided by the present invention adopts a modular compact design, with a four-speed structure composed of parallel shafts and a planetary structure at the output end, which further improves space utilization.

[0013] 4. The solution provided by the present invention significantly reduces the installation space requirement through volume optimization, is suitable for modification of existing vehicle models, and has better cost competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is the schematic diagram of the four-speed electric drive axle with main and auxiliary motors; Figure 2 This is the gear diagram of the four-speed electric drive axle of the main and auxiliary motors.

[0015] Reference numerals in the figure: main input unit 1, main motor 11, main input gear 12, auxiliary input unit 2, auxiliary motor 21, auxiliary input gear 22, first intermediate unit 3, first intermediate shaft 31, first front gear 32, first rear gear 33, first duplex gear 34, second intermediate unit 4, second intermediate shaft 41, second front gear 42, second rear gear 43, second duplex gear 44, output unit 5, output planetary gear set 51, wheel-side planetary gear set 52, differential 53, left half shaft 54, right half shaft 55, first gear shift mechanism 6, second gear shift mechanism 7. 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] Please also see Figure 1 and Figure 2 , which are respectively the principle diagram and gear diagram of the four-speed electric drive axle of the main and auxiliary motors provided by the present invention.

[0018] The four-speed electric drive axle with main and auxiliary motors includes a main input unit 1 , an auxiliary input unit 2 , a first intermediate unit 3 , a second intermediate unit 4 , an output unit 5 , a first shift mechanism 6 , and a second shift mechanism 7 .

[0019] The main input unit 1 includes a main motor 11 and main input teeth 12 provided on the main shaft thereof, and the auxiliary input unit 2 includes an auxiliary motor 21 and auxiliary input teeth 22 provided on the main shaft thereof.

[0020] The first intermediate unit 3 includes a first intermediate shaft 31, a first front tooth 32, a first rear tooth 33 and a first duplex tooth 34 provided on the first intermediate shaft 31. The first front tooth 32 is fixed, the first rear tooth 33 is rotatable, and the first duplex tooth 34 is rotatable.

[0021] The main input teeth 12 mesh with the first front teeth 32. The first front teeth 32, first duplex teeth 34, and first rear teeth 33 are arranged on the first intermediate shaft 31 in order from right to left. The small teeth of the first duplex teeth 34 are located near the first front teeth 32, and the large teeth are located near the first rear teeth 33. A first shift mechanism 6 is provided on the first intermediate shaft 31 between the first duplex teeth 33 and the first rear teeth 34.

[0022] The second intermediate unit 4 includes a second intermediate shaft 41, a second front tooth 42, a second rear tooth 43 and a second duplex tooth 44 provided on the second intermediate shaft 41. The second front tooth 42 is rotatable, the second rear tooth 43 is fixed, and the second duplex tooth 44 is rotatable.

[0023] The auxiliary input teeth 22 mesh with the second rear teeth 43. The second duplex teeth 44, second front teeth 42, and second rear teeth 43 are arranged on the second intermediate shaft 41 in this order from left to right. The small teeth of the second duplex teeth 44 are located near the second front teeth 42, and the large teeth are located near the left end of the second intermediate shaft 41. A second shift mechanism 7 is provided on the second intermediate shaft 41 between the second duplex teeth 44 and the second front teeth 42.

[0024] The small teeth of the first duplex teeth 34 mesh with the second front teeth 42, the large teeth of the first duplex teeth 34 mesh with the small teeth of the second duplex teeth 44, and the first rear teeth 33 mesh with the large teeth of the second duplex teeth 44. The main motor 11, the first intermediate shaft 31, the second intermediate shaft 41, and the auxiliary motor 21 are all parallel.

[0025] When the first shift mechanism 6 is switched to the left position, the first intermediate shaft 31 is connected to the first rear gear 33 , and when it is switched to the right position, the first intermediate shaft 31 is connected to the first duplex gear 34 .

[0026] After the power of the main motor 11 is transmitted to the first intermediate shaft 31, if the first shift mechanism 6 is switched to the left position, the power is transmitted from the first rear teeth 33 to the second duplex teeth 44. If it is switched to the right position, the power is transmitted from the first duplex teeth 34 to the second duplex teeth 44 and the second front teeth 42.

[0027] When the second shift mechanism 7 is switched to the left position, the second intermediate shaft 41 is connected to the second duplex gear 44. When it is switched to the right position, the second intermediate shaft 41 is connected to the second front gear 42. Thus, the first shift mechanism 6 and the second shift mechanism 7 cooperate to achieve four gear positions: 1. If the first shift mechanism 6 is switched to the left position and the second shift mechanism 7 is switched to the left position, power is transmitted from the second duplex gear 44 to the second intermediate shaft 41 .

[0028] 2. If the first shift mechanism 6 is switched to the left position and the second shift mechanism 7 is switched to the right position, the power is transmitted from the second duplex teeth 44 to the first duplex teeth 34 , the second front teeth 43 , and finally to the second intermediate shaft 41 .

[0029] 3. If the first shift mechanism 6 is switched to the right position and the second shift mechanism 7 is switched to the left position, the power transmitted to the second duplex gear 44 drives the first rear gear 33 to rotate idly while being transmitted to the second intermediate shaft 41; the second front gear 42 rotates idly.

[0030] 4. If the first shift mechanism 6 is switched to the right position and the second shift mechanism 7 is switched to the right position, the power transmitted to the second duplex gear 44 drives the first rear gear 33 to rotate idly; the power transmitted to the second front gear 42 is further transmitted to the second intermediate shaft 41.

[0031] Specifically: 1. Switch the first shift mechanism 6 to the left position and the second shift mechanism 7 to the right position, which serves as the first gear of the four-speed electric drive axle of the main and auxiliary motors; 2. Switch the first shift mechanism 6 to the left position, and switch the second shift mechanism 7 to the left position, as the second gear of the four-speed electric drive axle of the main and auxiliary motors; 3. Switch the first shift mechanism 6 to the right position, and switch the second shift mechanism 7 to the right position, which serves as the third gear of the four-speed electric drive axle of the main and auxiliary motors; Fourth, the first shift mechanism 6 is switched to the right position, and the second shift mechanism 7 is switched to the left position, which serves as the fourth gear of the four-speed electric drive axle of the main and auxiliary motors.

[0032] At the same time, the power of the auxiliary motor 21 is transmitted to the second intermediate shaft 41 through the second rear gear 43, and the electronic control system intervenes at the appropriate time and speed.

[0033] The output unit 5 includes an output planetary gear set 51, a wheel-side planetary gear set 52, a differential 53, a left half-shaft 54, and a right half-shaft 55. The second intermediate shaft 41 is connected to the planetary gears of the output planetary gear set 51. The planetary carrier of the output planetary gear set 51 is connected to the housing of the differential 53. The left and right half-shafts 54 and 55 are connected to the differential 53, with the wheel-side planetary gear set 52 at their ends.

[0034] The power transmitted to the second intermediate shaft 41 is decelerated by the output planetary gear set 51 and then distributed to the left half shaft 54 ​​and the right half shaft 55 by the differential 53, and drives the left and right wheels through the wheel-side planetary gear sets 52 provided on the left half shaft 54 ​​and the right half shaft 55 respectively.

[0035] 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-speed electric drive axle with main and auxiliary motors, characterized by: It includes a main input unit, an auxiliary input unit, a first intermediate unit, a second intermediate unit and an output unit. The main input unit, the first intermediate unit, the second intermediate unit and the output unit are connected in sequence. The auxiliary input unit is connected to the second intermediate unit. The first intermediate unit is provided with a first gear shifting mechanism, and the second intermediate unit is provided with a second gear shifting mechanism.

2. The four-speed electric drive axle with main and auxiliary motors according to claim 1, characterized in that: The first intermediate unit includes a first intermediate shaft, a first front tooth, a first double tooth and a first rear tooth provided on the first intermediate shaft, the first front tooth is fixed, the first double tooth and the first rear tooth are rotatably provided, and the first front tooth is connected to the main input unit.

3. The four-speed electric drive axle with main and auxiliary motors according to claim 2, characterized in that: The second intermediate unit includes a second intermediate shaft, a second double tooth, a second front tooth and a second rear tooth arranged on the second intermediate shaft, the second double tooth and the second front tooth are rotatably arranged, the second rear tooth is fixedly arranged, and the second rear tooth is connected to the auxiliary input unit.

4. The four-speed electric drive axle with main and auxiliary motors according to claim 3, characterized in that: The large teeth in the first doublet teeth mesh with the small teeth in the second doublet teeth, the small teeth mesh with the second front teeth, and the large teeth in the second doublet teeth mesh with the first rear teeth.

5. The four-speed electric drive axle with main and auxiliary motors according to claim 4, characterized in that: The first shift mechanism is provided on the first intermediate shaft, between the first duplex teeth and the first rear teeth. When the first shift mechanism is switched to first gear, the first intermediate shaft is connected to the first rear teeth. When the first shift mechanism is switched to second gear, the first intermediate shaft is connected to the first duplex teeth.

6. The four-speed electric drive axle with main and auxiliary motors according to claim 4, characterized in that: The second shifting mechanism is provided on the second intermediate shaft, between the second duplex teeth and the second front teeth. When the second shifting mechanism is switched to first gear, the second intermediate shaft is connected to the second duplex teeth. When the second shifting mechanism is switched to second gear, the second intermediate shaft is connected to the second front teeth.

7. The four-speed electric drive axle with main and auxiliary motors according to claim 4, characterized in that: The main input unit includes a main motor and main input teeth provided on the main motor shaft, and the auxiliary input unit includes an auxiliary motor and auxiliary input teeth provided on the auxiliary motor shaft, the main input teeth meshing with the first front teeth, and the auxiliary input teeth meshing with the second rear teeth.

8. The four-speed electric drive axle with main and auxiliary motors according to claim 1, characterized in that: The output unit includes a differential and a left half shaft and a right half shaft connected to the differential, and the second intermediate shaft is connected to a housing of the differential.

9. The four-speed electric drive axle with main and auxiliary motors according to claim 8, characterized in that: The output unit further includes an output planetary gear, a sun gear of the output planetary gear is connected to the second intermediate shaft, and a planet carrier is connected to the housing of the differential.

10. The four-speed electric drive axle with main and auxiliary motors according to claim 8, characterized in that: The output unit further includes a wheel-side planetary gear set, and the sun gears of the two wheel-side planetary gear sets are respectively connected to the ends of the left half shaft and the right half shaft.

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