Double-planet-row output double-motor driving transmission device

Abstract

The invention provides a double-motor driving transmission device with two-stage planet row output. The double-motor driving transmission device with the two-stage planet row output comprises two sets of driving units, each driving unit comprises a motor and a transmission gear set which are sequentially connected and is connected with a first planet row, each transmission gear set is provided with a gear shifting mechanism, and a gear ring and a planet carrier of each first planet row are connected with a left half shaft and a right half shaft respectively. The left half shaft or the right half shaft is provided with an output tooth set, and the left half shaft and the right half shaft are both provided with two types of output tooth sets. According to the double-motor driving transmission device with the two-stage planet row output, the problem that an existing transmission device cannot meet the use requirement of an electrically-driven commercial vehicle is solved.

Description

Technical Field

[0001] The present invention relates to the field of transmission devices, and particularly to a dual-motor drive transmission device with a dual-stage planetary gear set output. Background Art

[0002] The trend of commercial vehicle electrification is becoming increasingly significant, and the penetration rate is getting higher. Commercial vehicles require greater power than passenger vehicles, needing greater torque and power, and even requiring a multi-speed transmission device; the electric drive is directly installed on the axle to drive the wheels, and some use high-power single motors or low-power dual motors, and there are various transmission configuration schemes to achieve multi-speed coupling. At present, electric drive commercial vehicles require the transmission device to have the capabilities of uninterrupted shifting power, neutral gear, direct gear, and single-motor operation, etc., but the existing transmission device products cannot fully meet the above usage requirements. Summary of the Invention

[0003] To solve the problem that the existing transmission device cannot meet the usage requirements of electric drive commercial vehicles, the present invention provides a dual-motor drive transmission device with a dual-stage planetary gear set output to solve the above problems.

[0004] A dual-motor drive transmission device with a dual-stage planetary gear set output includes two sets of drive units. Each drive unit includes a motor, a transmission gear set connected in sequence, and is connected to a first planetary gear set. The transmission gear set is provided with a shifting mechanism. The ring gear and the planet carrier of the first planetary gear set are respectively connected to the left half shaft and the right half shaft. There are two configurations including that the left half shaft or the right half shaft is provided with an output gear set, and both the left half shaft and the right half shaft are provided with output gear sets.

[0005] In a preferred embodiment of the dual-motor drive transmission device with a dual-stage planetary gear set output provided by the present invention, the transmission gear set includes an input shaft, an intermediate shaft, and a transmission shaft. The input shaft is provided with input teeth, the intermediate shaft is provided with intermediate teeth and the shifting mechanism. The input shaft is connected to the motor, the input teeth mesh with the intermediate teeth, the shifting mechanism, the transmission shaft, and the sun gear of the first planetary gear set are connected in sequence, and the two sets of transmission gear sets share the same transmission shaft.

[0006] In a preferred embodiment of the dual-motor drive transmission device with a dual-stage planetary gear set output provided by the present invention, the shifting mechanism includes a shifting spline provided on the intermediate shaft, and a first gear and a second gear slidably provided on the intermediate shaft. When in the first gear, the shifting spline is connected to the first gear, and when in the second gear, it is connected to the second gear. The transmission shaft is provided with a large transmission gear and a small transmission gear, which respectively mesh with the first gear and the second gear.

[0007] In a preferred embodiment of the dual-motor drive transmission device with dual planetary row output provided by the present invention, the shifting mechanism includes a second planetary row. The sun gear of the second planetary row is connected to the intermediate shaft, and the planet carrier is connected to the transmission shaft. When the shifting mechanism is in the first gear, the ring gear of the second planetary row is fixed. When the shifting mechanism is in the second gear, the ring gear of the second planetary row is connected to the sun gear or to the intermediate shaft.

[0008] In a preferred embodiment of the dual-motor drive transmission device with dual planetary row output provided by the present invention, the transmission gear set includes an input shaft and a transmission shaft. The input shaft is provided with input teeth, the transmission shaft is provided with transmission teeth and the shifting mechanism. The input teeth mesh with the transmission teeth. The input shaft is connected to the motor, the shifting mechanism is connected to the sun gear of the first planetary row, and the two transmission gear sets share the same transmission shaft.

[0009] In a preferred embodiment of the dual-motor drive transmission device with dual planetary row output provided by the present invention, the shifting mechanism includes a second planetary row. The sun gear of the second planetary row is connected to the transmission shaft, and the planet carrier is connected to the sun gear of the first planetary row. When the shifting mechanism is in the first gear, the ring gear of the second planetary row is fixed. When the shifting mechanism is in the second gear, the ring gear of the second planetary row is connected to the planet carrier.

[0010] In a preferred embodiment of the dual-motor drive transmission device with dual planetary row output provided by the present invention, in the configuration where the output gear set is provided on the left half shaft or the right half shaft, the half shaft connected to the ring gear of the first planetary row is provided with the output gear set. The output gear set is a third planetary gear. The sun gear of the third planetary gear is connected to the ring gear of the first planetary row, and the planet carrier is fixed and the ring gear outputs, or the ring gear is fixed and the planet carrier outputs. If the third planetary gear is a single-layer planetary gear, its planet carrier is fixed and the ring gear outputs. If it is a double-layer planetary gear, its ring gear is fixed and the planet carrier outputs.

[0011] In a preferred embodiment of the dual-motor drive transmission device with dual planetary row output provided by the present invention, in the configuration where the output gear sets are provided on both the left half shaft and the right half shaft, the output gear sets are third planetary gears. The planet carrier of one third planetary gear is fixed and the ring gear outputs, and the ring gear of the other third planetary gear is fixed and the planet carrier outputs.

[0012] Compared with the prior art, the dual-motor drive transmission device with dual planetary row output provided by the present invention has the following beneficial effects: 1. The solution provided by the present invention is equipped with two sets of shifting mechanisms, each of which has two gears, providing greater torque and higher speed for the whole vehicle. Due to the provision of two sets of shifting mechanisms, when one motor drive mechanism shifts gears, the other motor drive mechanism remains working, thus achieving uninterrupted power and providing better power performance for the whole vehicle.

[0013] 2. In the solution provided by the present invention, the shifting mechanism of each motor drive system can be disengaged to neutral, thus achieving better economy. And when one motor drive system fails, the other motor can still work, having good reliability and redundancy.

[0014] 3. The solution provided by the present invention adopts an integrated design of a dual-motor configuration, with a smaller space and a higher energy density.

[0015] 4. In the solution provided by the present invention, an integrated differential function is adopted in the output planetary gear set, and both the high-torque and high-speed two gears are three-stage transmissions. It can be used for the drive devices of various vehicle types, especially the electric drive axle of commercial vehicles or the split-type axle electric drive device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the schematic diagram of the dual-motor drive transmission device with a two-stage planetary gear set output in Embodiment 1; Figure 2 is the schematic diagram of the dual-motor drive transmission device with a two-stage planetary gear set output in Embodiment 2; Figure 3 is the schematic diagram of the dual-motor drive transmission device with a two-stage planetary gear set output in Embodiment 3; Figure 4 is the schematic diagram of the dual-motor drive transmission device with a two-stage planetary gear set output in Embodiment 4; Figure 5 is the schematic diagram of the dual-motor drive transmission device with a two-stage planetary gear set output in Embodiment 5.

[0017] Reference numerals in the figures: Motor 1, transmission gear set 2, input shaft 21, input gear 22, intermediate shaft 23, intermediate gear 24, transmission shaft 25, small transmission gear 26, large transmission gear 27, transmission gear 28, shifting mechanism 3, first gear tooth 31, second gear tooth 32, shifting spline 33, first gear spline 34, second gear spline 35, first planetary gear set 4, second planetary gear set 5, third planetary gear set 6, left half shaft 71, right half shaft 72. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0019] Embodiment 1: Please refer to Figure 1 , which is a schematic structural diagram of a dual-motor drive transmission device with a double planetary gear set output in this embodiment.

[0020] The dual-motor drive transmission device with a double planetary gear set output includes two sets of drive units arranged in parallel. The drive unit includes a motor 1, a transmission gear set 2, and a shifting mechanism 3. The power of the two sets of drive units converges to the first planetary gear set 4 and is respectively output to the left half shaft 71 and the right half shaft 72.

[0021] The transmission gear set 2 includes an input shaft 21, an input gear 22, an intermediate shaft 23, an intermediate gear 24, a transmission shaft 25, a large transmission gear 27, and a small transmission gear 26. The input shaft 21 is provided with the input gear 22, the intermediate shaft 23 is provided with the intermediate gear 24, and the transmission shaft 25 is provided with the large transmission gear 27 and the small transmission gear 26. The input shaft 21 is connected to the motor 1, and the input gear 22 meshes with the intermediate gear 24.

[0022] The shifting mechanism 3 includes a shifting spline 33, a first gear 31, and a second gear 32. The shifting spline 33 is arranged on the intermediate shaft 23, and the first gear 31 and the second gear 32 are slidably arranged on the intermediate shaft 23. The first gear 31 meshes with the large transmission gear 27, and the second gear 32 meshes with the small transmission gear 26.

[0023] The power of the motor 1 sequentially passes through the input shaft 21, the input gear 22, the intermediate gear 24, the intermediate shaft 23, the shifting mechanism 3, the large transmission gear 27 or the small transmission gear 26, and is transmitted to the transmission shaft 25. The two sets of drive units share the same set of large transmission gear 27, small transmission gear 26, and transmission shaft 25, that is, the power of the two motors 1 converges to the same transmission shaft 25.

[0024] The first gear 31 and the second gear 32 are also provided with splines on the adjacent side. When the shifting mechanism 3 is switched to the first gear, the sliding sleeve connects the spline of the first gear 31 and the shifting spline 31, and the power is transmitted to the transmission shaft 25 through the large transmission gear 27; when the shifting mechanism 3 is switched to the second gear, the sliding sleeve connects the spline of the second gear 32 and the shifting spline 31, and the power is transmitted to the transmission shaft 25 through the small transmission gear 26.

[0025] The transmission shaft 25 is connected to the sun gear of the first planetary gear set 4. The planet carrier of the first planetary gear set 4 is connected to the left half shaft 71, and the ring gear is connected to the right half shaft 72. An output gear set is provided on the right half shaft 72, and the output gear set is the third planetary gear set 6. The sun gear of the third planetary gear set 6 is connected to the ring gear of the first planetary gear set, the planet carrier of the third planetary gear set 6 is fixed, and the ring gear is connected to the right half shaft 72 for output.

[0026] Embodiment 2: Please refer to Figure 2 , which is a schematic structural diagram of a dual-motor drive transmission device with a double planetary gear set output in this embodiment. The difference from Embodiment 1 is that: The third planetary gear set 6 includes double-layer planetary gears. The ring gear of the third planetary gear set 6 is fixed, and the planet carrier is connected to the right half shaft 72 for output.

[0027] Embodiment 3: Please refer to Figure 3 , which is a schematic structural diagram of the dual-motor drive transmission device output by the double planetary gear set in this embodiment. The difference from Embodiment 1 is that: The transmission gear set 2 includes an input shaft 21, an input gear 22, an intermediate shaft 23, an intermediate gear 24, a transmission shaft 25, and a transmission gear 28. The input shaft 21 is provided with the input gear 22, the intermediate shaft 23 is provided with the intermediate gear 24, and the transmission shaft 25 is provided with the transmission gear 28. The input shaft 21 is connected to the motor 1, and the input gear 22 meshes with the intermediate gear 24.

[0028] The shifting mechanism 3 includes a second planetary gear set 5, a first gear spline 34, and a second gear spline 35. The intermediate shaft 23 is connected to and penetrates through the sun gear of the second planetary gear set 5, and a first gear spline 34 is provided at the end. The ring gear of the second planetary gear set 5 is provided with a second gear spline 35 along the intermediate shaft 23 on the left side. The planet carrier of the second planetary gear set 5 is provided with a gear along the intermediate shaft 23 on the right side, which meshes with the transmission gear 28.

[0029] The power of the motor 1 is sequentially transmitted through the input shaft 21, the input gear 22, the intermediate gear 24, the intermediate shaft 23, the second planetary gear set 5, and the transmission gear 28 to the transmission shaft 25.

[0030] The two drive units share the same set of transmission gear 28 and transmission shaft 25, that is, the power of the two motors 1 converges to the same transmission shaft 25.

[0031] When the shifting mechanism 3 is switched to the first gear, the sliding sleeve connects the first gear spline 34 and the fixed housing, thereby fixing the ring gear of the second planetary gear set 5. After the power is decelerated by the second planetary gear set 5, it is output from the planet carrier of the second planetary gear set 5 to the transmission shaft 25.

[0032] When the shifting mechanism 3 is switched to the second gear, the sliding sleeve connects the first gear spline 34 and the second gear spline 35, connecting the ring gear of the second planetary gear set 5 and the intermediate shaft 23. The second planetary gear set 5 rotates as a whole, and the power is directly output from the planet carrier of the second planetary gear set 5 to the transmission shaft 25.

[0033] Embodiment 4: Please refer to Figure 4 , which is a schematic structural diagram of the dual-motor drive transmission device output by the double planetary gear set in this embodiment. The difference from Embodiment 1 is that: The planet carrier of the first planetary gear set 4 is connected to the left half shaft 71, and the ring gear is connected to the right half shaft 72. Output gear sets are provided on both the left half shaft 71 and the right half shaft 72, and the output gear set is the third planetary gear set 6.

[0034] The planet carrier of the first planetary gear set 4 is connected to the sun gear of the third planetary gear set 6 provided on the left half shaft 71, and the planet carrier of the third planetary gear set 6 is fixed and the ring gear is output. The ring gear of the first planetary gear set 4 is connected to the sun gear of the third planetary gear set 6 provided on the right half shaft 72, and the ring gear of the third planetary gear set 6 is fixed and the planet carrier is output.

[0035] Embodiment 5: Please refer to Figure 5 , which is a schematic structural diagram of a dual-motor drive transmission device with a double planetary gear set output in this embodiment.

[0036] The dual-motor drive transmission device with a double planetary gear set output includes two sets of drive units arranged in parallel. The drive unit includes a motor 1 and a transmission gear set 2. The power of the two sets of drive units converges to the first planetary gear set 4 and is respectively output to the left half shaft 71 and the right half shaft 72.

[0037] The transmission gear set 2 includes an input shaft 21, an input gear 22, a transmission shaft 25, and a transmission gear 28. The input shaft 21 is provided with the input gear 22, and the transmission shaft 25 is provided with the transmission gear 28. The input shaft 21 is connected to the motor 1, and the input gear 22 meshes with the transmission gear 28.

[0038] The shift mechanism 3 includes a second planetary gear set 5, a first gear spline 34, and a second gear spline 35. The transmission shaft 25 is connected to the sun gear of the second planetary gear set 5, and the planet carrier of the second planetary gear set 5 is connected to the sun gear of the first planetary gear set 4. A first gear spline 34 is provided on the outer side of the planet carrier of the second planetary gear set 5 along the outer side of the planet carrier of the second planetary gear set 5, and a second gear spline 35 is provided on the outer side of the planet carrier of the second planetary gear set 5.

[0039] The power of the motor 1 sequentially passes through the input shaft 21, the input gear 22, the transmission gear 28, and the transmission shaft 25 and is transmitted to the second planetary gear set 5. The two sets of drive units share the same set of transmission gears 28 and transmission shafts 25, that is, the power of the two motors 1 converges to the sun gear of the second planetary gear set 5.

[0040] The planet carrier of the second planetary gear set 5 is connected to the sun gear of the first planetary gear set 4.

[0041] When the shift mechanism 3 is switched to the first gear, the sliding sleeve connects the first gear spline 34 and the fixed housing, thereby fixing the ring gear of the second planetary gear set 5. After the power is decelerated by the second planetary gear set 5, it is output from the planet carrier of the second planetary gear set 5 to the sun gear of the first planetary gear set 4.

[0042] When the shift mechanism 3 is switched to the second gear, the sliding sleeve connects the first gear spline 34 and the second gear spline 35, connects the ring gear and the planet carrier of the second planetary gear set 5, and the second planetary gear set 5 rotates as a whole. The power is directly output from the planet carrier of the second planetary gear set 5 to the sun gear of the first planetary gear set 4.

[0043] The planet carrier of the first planetary gear set 4 is connected to the left half shaft 71, and the ring gear is connected to the right half shaft 72. Output gear sets are provided on both the left half shaft 71 and the right half shaft 72, and the output gear set is a third planetary gear set 6.

[0044] The carrier of the first planetary gear set 4 is connected to the sun gear of the third planetary gear set 6 provided on the left half shaft 71. The carrier of the third planetary gear set 6 is fixed and the ring gear outputs. The ring gear of the first planetary gear set 4 is connected to the sun gear of the third planetary gear set 6 provided on the right half shaft 72. The ring gear of the third planetary gear set 6 is fixed and the carrier outputs.

[0045] The above are only the embodiments of the present invention, and do not thus limit the patent scope of the present invention. All equivalent structural or equivalent process transformations made by using the content of the specification of the present invention, or directly or indirectly applied in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A dual-motor drive transmission device with a double planetary gear set output, characterized in that: It includes two sets of driving units. The driving unit includes a motor and a transmission gear set connected in sequence, and is connected to a first planetary gear set. The transmission gear set is provided with a shifting mechanism. The ring gear and the planet carrier of the first planetary gear set are respectively connected to the left half shaft and the right half shaft, including two configurations where the output gear set is provided on the left half shaft or the right half shaft, and the output gear set is provided on both the left half shaft and the right half shaft.

2. The dual-motor drive transmission device with a dual-stage planetary gear set output according to claim 1, wherein: The transmission gear set includes an input shaft, an intermediate shaft and a transmission shaft. The input shaft is provided with input teeth. The intermediate shaft is provided with intermediate teeth and the shifting mechanism. The input shaft is connected to the motor. The input teeth mesh with the intermediate teeth. The shifting mechanism, the transmission shaft, and the sun gear of the first planetary gear set are connected in sequence. The two sets of transmission gear sets share the same transmission shaft.

3. The dual-motor drive transmission device with a dual-stage planetary gear set output according to claim 2, characterized in that: The shifting mechanism includes a shifting spline provided on the intermediate shaft, and a first gear and a second gear slidably provided on the intermediate shaft. When the shifting mechanism is in the first gear, the shifting spline is connected to the first gear. When it is in the second gear, it is connected to the second gear.

4. The dual-motor drive transmission device with a dual-stage planetary gear set output according to claim 3, characterized in that: The transmission shaft is provided with a large transmission gear and a small transmission gear, which respectively mesh with the first gear and the second gear.

5. The dual-motor drive transmission device with a dual-stage planetary gear set output according to claim 2, wherein: The shifting mechanism includes a second planetary gear set. The sun gear of the second planetary gear set is connected to the intermediate shaft, and the planet carrier is connected to the transmission shaft. When the shifting mechanism is in the first gear, the ring gear of the second planetary gear set is fixed. When the shifting mechanism is in the second gear, the ring gear of the second planetary gear set is connected to the sun gear or the intermediate shaft.

6. The dual-motor drive transmission device with a dual-stage planetary gear set 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. The transmission shaft is provided with transmission teeth and the shifting mechanism. The input teeth mesh with the transmission teeth. The input shaft is connected to the motor. The shifting mechanism is connected to the sun gear of the first planetary gear set. The two sets of transmission gear sets share the same transmission shaft.

7. The dual-motor drive transmission device with double planetary row output according to claim 6, characterized in that: The shifting mechanism includes a second planetary gear set. The sun gear of the second planetary gear set is connected to the transmission shaft, and the planet carrier is connected to the sun gear of the first planetary gear set. When the shifting mechanism is in the first gear, the ring gear of the second planetary gear set is fixed. When the shifting mechanism is in the second gear, the ring gear of the second planetary gear set is connected to the planet carrier.

8. The dual-motor drive transmission device with double planetary row output according to claim 1, characterized in that: In the configuration where the output gear set is provided on the left half shaft or the right half shaft, the half shaft connected to the ring gear of the first planetary gear set is provided with the output gear set. The output gear set is a third planetary gear. The sun gear of the third planetary gear is connected to the ring gear of the first planetary gear set. The planet carrier is fixed and the ring gear outputs, or the ring gear is fixed and the planet carrier outputs.

9. The dual-motor drive transmission device with a dual-stage planetary gear set output according to claim 2, characterized in that: If the third planetary gear is a single-layer planetary gear, its planet carrier is fixed and the ring gear outputs. If it is a double-layer planetary gear, its ring gear is fixed and the planet carrier outputs.

10. The dual-motor drive transmission device with a dual-stage planetary gear set output according to claim 1, characterized in that: In the configuration where the output gear set is provided on both the left half shaft and the right half shaft, the output gear set is a third planetary gear. The planet carrier of one third planetary gear is fixed and the ring gear outputs, and the ring gear of the other third planetary gear is fixed and the planet carrier outputs.

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