Dual-motor drive transmission with differential output

Abstract

This invention provides a dual-motor drive transmission device with differential output. The dual-motor drive transmission device with differential output includes two sets of drive units. Each drive unit includes a motor, a transmission gear set, and a first planetary gear set connected in sequence. The power from the two sets of drive units is combined and output to the differential and then to the wheels on both sides. The first planetary gear set is equipped with a shifting mechanism, including three configurations: upstream, downstream, and both upstream and downstream. In first gear, the transmission gear set is decelerated by the first planetary gear set before being output to the differential. In second gear, the transmission gear set is not decelerated before being output to the differential. The dual-motor drive transmission device with differential output provided by this invention solves the problem that existing transmission devices cannot meet the needs of electric commercial vehicles.

Description

Technical Field

[0001] This utility model relates to the field of transmission devices, specifically to a dual-motor drive transmission device with differential output. Background Technology

[0002] The trend towards electric drive in commercial vehicles is becoming increasingly significant and its penetration rate is rising. Commercial vehicles require more power than passenger vehicles, necessitating higher torque and power outputs, and sometimes even multi-speed transmissions. Electric drives are directly mounted on the axle to drive the wheels, and some use a high-power single motor, while others use a low-power dual motor. Various transmission configurations exist to achieve multi-speed coupling. Currently, electric commercial vehicles require transmissions that can shift gears without interruption of power, allow neutral, direct drive, and single-motor operation. However, existing transmission products cannot fully meet these requirements. Utility Model Content

[0003] To address the problem that existing transmission devices cannot meet the needs of electric commercial vehicles, this invention provides a dual-motor drive transmission device with differential output that solves the aforementioned problem.

[0004] A dual-motor drive transmission device with differential output includes two sets of drive units. Each drive unit includes a motor, a transmission gear set, and a first planetary gear set connected in sequence. The power of the two sets of drive units is combined and output to the differential and to both wheels. The first planetary gear set is equipped with a shifting mechanism, including three configurations: located upstream of the first planetary gear set, located downstream of the first planetary gear set, and located simultaneously upstream and downstream of the first planetary gear set. When the shifting mechanism is in first gear, the transmission gear set is decelerated by the first planetary gear set and output to the differential. When the shifting mechanism is in second gear, the transmission gear set is not decelerated and output to the differential.

[0005] In a preferred embodiment of the dual-motor drive transmission device with differential output provided by this utility model, the transmission gear set includes an input shaft, an intermediate shaft, and a transmission shaft. The input shaft is provided with input teeth, the transmission shaft is provided with transmission teeth, and the intermediate shaft is provided with a large intermediate tooth that meshes with the input shaft and a small intermediate tooth that meshes with the transmission shaft. The input shaft is connected to the motor, and the transmission shaft is connected to the planetary gear set or the differential.

[0006] In a preferred embodiment of the dual-motor drive transmission device with differential output provided by this utility model, the transmission gear set includes an input shaft and a transmission shaft. The input shaft is provided with input teeth, and the transmission shaft is provided with transmission teeth that mesh with the input teeth. The differential outputs to the two wheels on both sides through two second planetary gear sets; the sun gear of the second planetary gear set is connected to the differential, and the planet carrier of the second planetary gear set outputs to one wheel.

[0007] In a preferred embodiment of the differential output dual-motor drive transmission device provided by this utility model, the two sets of drive units share the first planetary gear set and share the part of the transmission gear set other than the input shaft and the input teeth.

[0008] In a preferred embodiment of the dual-motor drive transmission device with differential output provided by this utility model, the shifting mechanism is located upstream of the planetary gear set, that is, the shifting mechanism is located between the drive shaft and the sun gear of the planetary gear set. The ring gear of the planetary gear set is fixed, and the planet carrier of the planetary gear set is connected to the housing of the differential. When the shifting mechanism is in first gear, the drive shaft is connected to the sun gear of the planetary gear set; when the shifting mechanism is in second gear, the drive shaft is connected to the housing of the differential.

[0009] In a preferred embodiment of the dual-motor drive transmission device with differential output provided by this utility model, the shifting mechanism is located downstream of the planetary gear set, that is, the shifting mechanism is located between the planetary gear set and the differential. The drive shaft is connected to the sun gear of the planetary gear set, and the planet carrier of the planetary gear set is connected to the housing of the differential. When the shifting mechanism is in first gear, the ring gear of the planetary gear set is fixed; when the shifting mechanism is in second gear, the ring gear of the planetary gear set is connected to the planet carrier.

[0010] Compared with existing technologies, the dual-motor drive transmission device with differential output provided by this utility model has the following advantages:

[0011] 1. The solution provided by this utility model is equipped with two shifting mechanisms, each with two gears, providing the vehicle with greater torque and higher speed. Because it is equipped with two shifting mechanisms, when one motor drive mechanism is shifting gears, the other motor drive mechanism remains operational, thus ensuring uninterrupted power and providing better power performance for the entire vehicle.

[0012] 2. In the solution provided by this utility model, the shifting mechanism of each motor drive system can be disconnected to neutral, thereby achieving better economy. Furthermore, when one motor drive system fails, the other motor can still operate, demonstrating excellent reliability and redundancy.

[0013] 3. The solution provided by this utility model adopts an integrated dual-electric mechanism design, which has a smaller space and higher energy density. It can be used in the drive devices of various vehicle models, especially the electric drive axle of commercial vehicles, or the electric drive device of a transfer axle. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the dual-motor drive transmission device with differential output in Example 1;

[0015] Figure 2 This is a schematic diagram of the dual-motor drive transmission device with differential output in Example 2;

[0016] Figure 3 This is a schematic diagram of the dual-motor drive transmission device with differential output in Example 3;

[0017] Figure 4 This is a schematic diagram of the dual-motor drive transmission device with differential output in Example 4.

[0018] The diagram is labeled as follows: 1. Motor; 2. Transmission gear set; 21. Input shaft; 22. Input gear; 23. Intermediate shaft; 24. Intermediate large gear; 25. Intermediate small gear; 26. Transmission shaft; 27. Transmission gear; 3. Shifting mechanism; 31. First gear spline; 32. Second gear spline; 4. First planetary gear set; 41. Sun gear; 42. Planetary gear; 43. Planetary carrier; 44. Ring gear; 5. Differential; 51. Left half-shaft; 52. Right half-shaft; 6. Second planetary gear set. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] Example 1: Please refer to Figure 1 This is a schematic diagram of the dual-motor drive transmission device with differential output in this embodiment.

[0021] The differential output dual-motor drive transmission device includes two sets of drive units in parallel. Each drive unit includes a motor 1, a transmission gear set 2, a shifting mechanism 3, and a first planetary gear set 4. The power of the two sets of drive units is combined into the differential 5 and distributed to the left half-shaft 51 and the right half-shaft 52.

[0022] The transmission gear set 2 includes an input shaft 21, an input gear 22, an intermediate shaft 23, an intermediate large gear 24, an intermediate small gear 25, a transmission shaft 26, and a transmission gear 27.

[0023] The drive shaft of motor 1 is connected to the input shaft 21. The input shaft 21 has an input tooth 22, the intermediate shaft 23 has a large intermediate tooth 24 and a small intermediate tooth 25, and the drive shaft 26 has a drive tooth 27. The input tooth 22 meshes with the large intermediate tooth 24, and the drive tooth 27 meshes with the small intermediate tooth 25. The power from motor 1 is reduced in speed by the drive gear set 2 and then transmitted to the drive shaft 26.

[0024] The shift mechanism 3 is located upstream of the first planetary gear set 4, and the drive shaft 26 is disconnected from the first planetary gear set 4. The first planetary gear set 4 includes a sun gear 41, planet gears 42, a planet carrier 43, and a ring gear 44. The ring gear 44 is fixed, and the planet carrier 43 is connected to the housing of the differential 5.

[0025] Another shaft passes through the sun gear 41, with one end connected to the housing of the differential 5 and the other end having a spline. The drive shaft 26 and the sun gear 41 also have splines on the same side. The spline on the sun gear 41 is designated as the first-gear spline 31, and the spline on the differential 5 is designated as the second-gear spline 32.

[0026] When shifting gear 3 is in first gear, the sliding sleeve of shifting gear 3 connects the drive shaft 26 and the first gear spline 31, and the power is transmitted to the sun gear 41. After reduction, the first planetary gear set 4 outputs the power to the housing of the differential 5. When shifting gear 3 is in second gear, the sliding sleeve of shifting gear 3 connects the drive shaft 26 and the second gear spline 32, and the power is directly output to the housing of the differential 5 without reduction.

[0027] The internal gears of the differential 5 are connected to the left half-shaft 51 and the right half-shaft 52 respectively. The power transmitted to the housing of the differential 5 is output to the wheels on both sides from the left half-shaft 51 and the right half-shaft 52 respectively.

[0028] In particular, both the left half-shaft 51 and the right half-shaft 52 pass through components such as the drive shaft 26 to improve integration and reduce space occupation.

[0029] Example 2: Please refer to Figure 2 This is a schematic diagram of the dual-motor drive transmission device with differential output in this embodiment. The difference from Embodiment 1 is:

[0030] The shift mechanism 3 is located downstream of the first planetary gear set 4. The first planetary gear set 4 includes a sun gear 41, planet gears 42, a planet carrier 43, and a ring gear 44. The planet carrier 43 is connected to the housing of the differential 5, and the sun gear 41 is connected to the drive shaft 26. Both the ring gear 44 and the planet carrier 43 are provided with splines, which are respectively designated as the first gear spline 31 and the second gear spline 32.

[0031] When shifting mechanism 3 is in first gear, the sliding sleeve of shifting mechanism 3 connects the first gear spline 31 and the fixed housing, fixing the gear ring 44. Power is reduced in speed by the first planetary gear set 4 and then output from the planet carrier 43 to the housing of the differential 5. When shifting mechanism 3 is in second gear, the sliding sleeve of shifting mechanism 3 connects the first gear spline 31 and the second gear spline 32, causing the first planetary gear set 4 to rotate as a whole. This is equivalent to power being directly output to the housing of the differential 5 without reduction in speed.

[0032] Example 3: Please refer to Figure 3 This is a schematic diagram of the dual-motor drive transmission device with differential output in this embodiment. The difference from Embodiment 1 is:

[0033] The transmission gear set 2 includes an input shaft 21, an input gear 22, a transmission shaft 26, and a transmission gear 27.

[0034] The drive shaft of motor 1 is connected to the input shaft 21. The input shaft 21 is provided with input teeth 22, and the drive shaft 26 is provided with drive teeth 27. The input teeth 22 mesh with the drive teeth 27. The power of motor 1 is transmitted to the drive shaft 26 after being reduced in speed by the drive gear set 2.

[0035] The two drive units share the drive shaft 26, drive gear 27, and the first planetary gear set 4. That is, the power of the two motors 1 is transmitted to the same drive gear 27 through their respective input shafts 21 and input gears 22, and finally to the same planetary gear set 4.

[0036] The shift mechanism 3 is located downstream of the first planetary gear set 4. The first planetary gear set 4 includes a sun gear 41, planet gears 42, a planet carrier 43, and a ring gear 44. The planet carrier 43 is connected to the housing of the differential 5, and the sun gear 41 is connected to the drive shaft 26. Both the ring gear 44 and the planet carrier 43 are provided with splines, which are respectively designated as the first gear spline 31 and the second gear spline 32.

[0037] When shifting mechanism 3 is in first gear, the sliding sleeve of shifting mechanism 3 connects the first gear spline 31 and the fixed housing, fixing the gear ring 44. Power is reduced in speed by the first planetary gear set 4 and then output from the planet carrier 43 to the housing of the differential 5. When shifting mechanism 3 is in second gear, the sliding sleeve of shifting mechanism 3 connects the first gear spline 31 and the second gear spline 32, causing the first planetary gear set 4 to rotate as a whole. This is equivalent to power being directly output to the housing of the differential 5 without reduction in speed.

[0038] It also includes two second planetary gear sets 6. The sun gears of the two second planetary gear sets 6 are connected to the left half-shaft 51 and the right half-shaft 52 respectively, and the planet carriers of the two second planetary gear sets 6 deliver power to the wheels on both sides respectively.

[0039] Example 4: Please refer to Figure 4 This is a schematic diagram of the dual-motor drive transmission device with differential output in this embodiment. The difference from Embodiment 1 is:

[0040] The transmission gear set 2 includes an input shaft 21, an input gear 22, a transmission shaft 26, and a transmission gear 27.

[0041] The drive shaft of motor 1 is connected to the input shaft 21. The input shaft 21 is provided with input teeth 22, and the drive shaft 26 is provided with drive teeth 27. The input teeth 22 mesh with the drive teeth 27. The power of motor 1 is transmitted to the drive shaft 26 after being reduced in speed by the drive gear set 2.

[0042] In a set of drive units, the shift mechanism 3 is located upstream of the first planetary gear set 4.

[0043] The drive shaft 26 is disconnected from the first planetary gear set 4. The first planetary gear set 4 includes a sun gear 41, planet gears 42, a planet carrier 43, and a ring gear 44. The ring gear 44 is fixed, and the planet carrier 43 is connected to the housing of the differential 5.

[0044] Another shaft passes through the sun gear 41, with one end connected to the housing of the differential 5 and the other end having a spline. The drive shaft 26 and the sun gear 41 also have splines on the same side. The spline on the sun gear 41 is designated as the first-gear spline 31, and the spline on the differential 5 is designated as the second-gear spline 32.

[0045] When shifting gear 3 is in first gear, the sliding sleeve of shifting gear 3 connects the drive shaft 26 and the first gear spline 31, and the power is transmitted to the sun gear 41. After reduction, the first planetary gear set 4 outputs the power to the housing of the differential 5. When shifting gear 3 is in second gear, the sliding sleeve of shifting gear 3 connects the drive shaft 26 and the second gear spline 32, and the power is directly output to the housing of the differential 5 without reduction.

[0046] In another set of drive units, the shift mechanism 3 is located downstream of the first planetary gear set 4.

[0047] The first planetary gear set 4 includes a sun gear 41, planet gears 42, a planet carrier 43, and a ring gear 44. The planet carrier 43 is connected to the housing of the differential 5, and the sun gear 41 is connected to the drive shaft 26. Both the ring gear 44 and the planet carrier 43 are provided with splines, which are designated as first gear spline 31 and second gear spline 32, respectively.

[0048] When shifting mechanism 3 is in first gear, the sliding sleeve of shifting mechanism 3 connects the first gear spline 31 and the fixed housing, fixing the gear ring 44. Power is reduced in speed by the first planetary gear set 4 and then output from the planet carrier 43 to the housing of the differential 5. When shifting mechanism 3 is in second gear, the sliding sleeve of shifting mechanism 3 connects the first gear spline 31 and the second gear spline 32, causing the first planetary gear set 4 to rotate as a whole. This is equivalent to power being directly output to the housing of the differential 5 without reduction in speed.

[0049] It also includes two second planetary gear sets 6. The sun gears of the two second planetary gear sets 6 are connected to the left half-shaft 51 and the right half-shaft 52 respectively, and the planet carriers of the two second planetary gear sets 6 deliver power to the wheels on both sides respectively.

[0050] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A dual-motor drive transmission device with differential output, characterized in that: The system includes two drive units, each consisting of a motor, a transmission gear set, and a first planetary gear set connected in sequence. The power from the two drive units is combined and output to the differential and then to the wheels on both sides. The first planetary gear set is equipped with a shifting mechanism, which has three configurations: one upstream of the first planetary gear set, one downstream of the first planetary gear set, and one simultaneously upstream and downstream of the first planetary gear set. When the shifting mechanism is in first gear, the transmission gear set is decelerated by the first planetary gear set and then output to the differential. When the shifting mechanism is in second gear, the transmission gear set is not decelerated and is output to the differential.

2. The dual-motor drive transmission device with differential output according to claim 1, characterized in that: The transmission gear set includes an input shaft, an intermediate shaft, and a transmission shaft. The input shaft is provided with input teeth, the transmission shaft is provided with transmission teeth, and the intermediate shaft is provided with a large intermediate tooth that meshes with the input shaft and a small intermediate tooth that meshes with the transmission shaft. The input shaft is connected to the motor, and the transmission shaft is connected to the planetary gear set or the differential.

3. The dual-motor drive transmission device with differential output according to claim 1, characterized in that: The transmission gear set includes an input shaft and a transmission shaft. The input shaft is provided with input teeth, and the transmission shaft is provided with transmission teeth that mesh with the input teeth.

4. The dual-motor drive transmission device with differential output according to claim 3, characterized in that: It also includes a second planetary gear set, through which the differential outputs to the two wheels on both sides via two second planetary gear sets; the sun gear of the second planetary gear set is connected to the differential, and the planet carrier of the second planetary gear set outputs to one wheel.

5. The dual-motor drive transmission device with differential output according to any one of claims 2 to 4, characterized in that: The two sets of drive units share the first planetary gear set and the portion of the transmission gear set excluding the input shaft and the input teeth.

6. The dual-motor drive transmission device with differential output according to claim 1, characterized in that: The shifting mechanism is located upstream of the planetary gear set, that is, the shifting mechanism is located between the transmission gear set and the sun gear of the planetary gear set. The ring gear of the planetary gear set is fixed, and the planet carrier of the planetary gear set is connected to the housing of the differential.

7. The dual-motor drive transmission device with differential output according to claim 6, characterized in that: When the shifting mechanism is in first gear, the transmission gear set is connected to the sun gear of the planetary gear set; when the shifting mechanism is in second gear, the transmission gear set is connected to the housing of the differential.

8. The dual-motor drive transmission device with differential output according to claim 1, characterized in that: The shifting mechanism is located downstream of the planetary gear set, that is, between the planetary gear set and the differential. The planet carrier of the planetary gear set is connected to the housing of the differential, and the transmission gear set is connected to the sun gear of the planetary gear set.

9. The dual-motor drive transmission device with differential output according to claim 8, characterized in that: When the shifting mechanism is in first gear, the gear ring of the planetary gear set is fixed; when the shifting mechanism is in second gear, the gear ring of the planetary gear set is connected to the planet carrier.

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