Multi-gear coaxial electric drive axle transmission device

Abstract

The invention discloses a multi-gear coaxial type electric drive axle transmission device, and relates to the technical field of transmission equipment, the multi-gear coaxial type electric drive axle transmission device comprises a left half shaft, a right half shaft, a limited slip differential assembly, a main motor and an auxiliary motor, the two output sides of the limited slip differential assembly are connected with the left half shaft and the right half shaft respectively, the left half shaft is provided with a first planet wheel mechanism and a planet row assembly, and the right half shaft is provided with a second planet wheel mechanism and a planet row assembly; a second planet wheel mechanism is arranged on the right half shaft, and the main motor, the auxiliary motor, the first planet wheel mechanism, the planet row assembly, the second planet wheel mechanism and the limited slip differential assembly are coaxially arranged. Three-gear speed change work is achieved through mutual cooperation of the main motor, the auxiliary motor, the first planet wheel mechanism, the planet row assembly and the second planet wheel mechanism, and the main motor, the auxiliary motor, the first planet wheel mechanism, the planet row assembly, the second planet wheel mechanism and the limited slip differential assembly are coaxially arranged, so that the whole device has the advantages of being high in integration degree, strong in power, high in speed change efficiency and the like. The space is compact; and the NVH is excellent.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission equipment, and in particular to a multi-speed coaxial electric drive axle transmission device. Background Art

[0002] At present, electric drive axles are usually equipped with single-speed transmissions to minimize cost, volume, weight and adaptability. Compared with single-speed transmissions that cannot take into account both torque and speed when the vehicle starts, multi-speed transmissions can provide high torque through low gears, and increase the speed of the vehicle through high gears to achieve compatibility between starting torque and speed, and can reduce the size, weight and speed of the motor. In the case that it is difficult to make major breakthroughs in battery technology in a short period of time, it is particularly important to increase the range of electric vehicles by improving efficiency.

[0003] The performance of the electric drive axle is mainly affected by three aspects: first, the power transmission path and distribution method of the electric drive axle change with different configurations, thus affecting the output of the electric drive axle; second, the structure of the electric drive axle will affect its own mass and volume, and thus affect its performance; third, the control strategy of the electric drive axle affects the coordinated work of its components.

[0004] For example, the publication number CN116021923A disclosed an electric drive axle transmission system on April 28, 2023, including: two motors, specifically EM-A motor and EM-B motor, EM-A motor is the driving motor of the main box, and EM-B motor is the driving motor of the auxiliary box; a reduction gear assembly; a set of two-speed gear assemblies; a set of planetary gear assembly, which includes a main reduction gear, a sun gear shaft, a sun gear, a planetary gear, and a planet carrier, the sun gear shaft is a hollow shaft, the input end of the sun gear shaft is equipped with the main reduction gear, and the output end of the sun gear shaft is fixed with a sun gear; a differential; and two half shafts, respectively a left half shaft and a right half shaft; the output end of the EM-B motor is connected to the input teeth of the reduction gear assembly, the output teeth of the reduction gear assembly are meshed and connected to the main reduction gear, and the outer circumference of the non-half shaft output end of the housing of the differential is fixed with a planet carrier. The above-mentioned disclosed electric drive axle has a complex structure, the electric drive axle occupies a large space, and the space utilization rate of the car is low. Summary of the invention

[0005] The purpose of the present invention is to provide a multi-speed coaxial electric drive axle transmission device with higher integration. The present invention makes the whole drive axle more integrated, the space more compact, and the space utilization rate higher by coaxially distributing the first planetary gear mechanism, the second planetary gear mechanism, the planetary gear assembly, and the limited slip differential assembly.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention to solve its technical problems is: a multi-speed coaxial electric drive axle transmission device, including a left half shaft, a right half shaft and a limited slip differential assembly, the left half shaft is provided with a main motor, the right half shaft is provided with an auxiliary motor, the two output sides of the limited slip differential assembly are respectively connected to the left half shaft and the right half shaft, the left half shaft is provided with a first planetary gear mechanism and a planetary gear assembly, the right half shaft is provided with a second planetary gear mechanism, the main motor, the auxiliary motor, the first planetary gear mechanism, the planetary gear assembly, the second planetary gear mechanism and the limited slip differential assembly are coaxially arranged.

[0007] The first planetary gear mechanism includes a first center wheel, a first planetary gear, a first ring gear, a second planetary gear and a transverse axis, the first center wheel is coaxially arranged with the left half shaft, the first center wheel is connected to the main motor, the first ring gear is arranged on the outside of the first center wheel, the first planetary gear is meshed with the first center wheel, the first planetary gear is connected to the second planetary gear through the transverse axis, and the second planetary gear is meshed with the first ring gear.

[0008] The first gear ring is provided with a first brake.

[0009] As a further solution of the present invention, the second planetary gear mechanism includes a third planetary gear, a second center gear and a third clutch, the third planetary gear is connected to the horizontal shaft, the third planetary gear is meshed with the second center gear, and the second center gear is connected to the power output end of the auxiliary motor through the third clutch.

[0010] A rotating arm is provided on one side of the planetary gear assembly. The rotating arm is connected to the first gear ring through a first clutch, and the transverse axis passes through the rotating arm.

[0011] The planetary gear assembly includes a sun gear, a fourth planetary gear, a second ring gear, a third clutch, a second brake and a planet carrier. The sun gear is fixedly connected to a swing arm, a second ring gear is provided outside the sun gear, the fourth planetary gear is meshed with the sun gear and the second gear, the second brake is connected to the second ring gear, the swing arm is connected to the second gear through the third clutch, and the fourth planetary gear is connected to a limited slip differential assembly through the planet carrier.

[0012] The limited slip differential assembly includes a differential assembly and a parking brake, wherein the parking brake is connected to the differential assembly, one side of the differential assembly is connected to the left half shaft, and the other side of the differential assembly is connected to the right half shaft.

[0013] The differential assembly is provided with a dog clutch.

[0014] The left half shaft and the right half shaft are coaxially arranged, and wheels are respectively arranged at the ends of the left half shaft and the right half shaft.

[0015] The beneficial effects of the present invention are:

[0016] The three-speed shifting is achieved through the mutual cooperation of the main motor, the auxiliary motor, the first planetary gear mechanism, the planetary gear assembly and the second planetary gear mechanism, and the main motor, the auxiliary motor, the first planetary gear mechanism, the planetary gear assembly, the second planetary gear mechanism and the limited slip differential assembly are coaxially arranged, so that the whole device has the advantages of high integration, strong power, compact space and excellent NVH; the differential assembly also has a limited slip function, which can effectively prevent the wheel slip caused by excessive speed difference while providing differential speed; the P gear parking is installed on the differential assembly to effectively ensure the safe parking of the vehicle in a stationary state; the reverse gear is achieved by motor reversal, and the structural layout is more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of a multi-speed coaxial electric drive axle transmission device of the present invention.

[0018] Figure 2 for Figure 1 The first gear power flow chart.

[0019] Figure 3 for Figure 1 Second gear power flow diagram.

[0020] Figure 4 for Figure 1 Three-speed power flow chart.

[0021] Figure 5 for Figure 1 Reverse gear power flow diagram.

[0022] In the accompanying drawings: 1-left half shaft, 2-main motor, 3-first center wheel, 4-first planetary gear, 5-first brake, 6-first ring gear, 7-first clutch, 8-second planetary gear, 9-swing arm, 10-sun gear, 11-fourth planetary gear, 12-second ring gear, 13-second clutch, 14-second brake, 15-planet carrier, 16-parking, 17-differential assembly, 18-third planetary gear, 19-second center wheel, 20-third clutch, 21-auxiliary motor, 22-right half shaft, 23-dog clutch, 100-limited slip differential assembly, 200-planetary gear assembly. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0025] like Figure 1As shown, a multi-speed coaxial electric drive axle transmission device includes a left half shaft 1, a right half shaft 22 and a limited slip differential assembly 100. The left half shaft 1 is provided with a main motor 2, the right half shaft 22 is provided with an auxiliary motor 21, and the two output sides of the limited slip differential assembly 100 are respectively connected to the left half shaft 1 and the right half shaft 22. The left half shaft 1 is provided with a first planetary gear mechanism and a planetary gear assembly 200, and the right half shaft 22 is provided with a second planetary gear mechanism. The main motor 2, the auxiliary motor 21, the first planetary gear mechanism, the planetary gear assembly 200, the second planetary gear mechanism and the limited slip differential assembly 100 are coaxially arranged.

[0026] The three-speed shifting operation is achieved through the mutual cooperation of the main motor 2, the auxiliary motor 21, the first planetary gear mechanism, the planetary gear assembly 200, and the second planetary gear mechanism, and the main motor 2, the auxiliary motor 21, the first planetary gear mechanism, the planetary gear assembly 200, the second planetary gear mechanism and the limited slip differential assembly 100 are coaxially arranged, so that the entire device has the advantages of high integration, strong power, compact space and excellent NVH.

[0027] Specifically, refer to Figure 1 The first planetary gear mechanism includes a first center wheel 3, a first planetary gear 4, a first ring gear 6, a second planetary gear 8 and a transverse shaft 24. The first center wheel 3 is coaxially distributed with the left half shaft 1. The first center wheel 3 is connected to the main motor 2. The first ring gear 6 is arranged on the outside of the first center wheel 3. The first planetary gear 4 is meshed with the first center wheel 3. The first planetary gear 4 is connected to the second planetary gear 8 through the transverse shaft 24. The second planetary gear 8 is meshed with the first ring gear 6. A first brake 5 is provided on the first ring gear 6. The first brake 5 controls the fixation and floating of the first ring gear 6. The first center wheel 3 rotates to drive the first planetary gear 4 to rotate, and the first planetary gear 4 rotates around the first center wheel 3 while rotating. The rotation of the first planetary gear 4 causes the transverse shaft 24 to drive the second planetary gear 8 to rotate, and the second planetary gear 8 rotates around the first center wheel 3 while rotating. The second planetary gear 8 rotates in the first ring gear 6, and the first center wheel 3 is connected to the power output end of the main motor 2.

[0028] The second planetary gear mechanism includes a third planetary gear 18, a second center gear 19 and a third clutch 20. The third planetary gear 18 is connected to the transverse shaft 24. The third planetary gear 18 is meshed with the second center gear 19. The second center gear 19 is connected to the power output end of the auxiliary motor 20 through the third clutch 20. When the third clutch 20 works, the power output end of the auxiliary motor 20 rotates to drive the second center gear 19 to rotate. The rotation of the second center gear 19 drives the third planetary gear 18 to rotate. The rotation of the third planetary gear 18 causes the transverse shaft 24 to drive the second planetary gear 8 to rotate, and the third planetary gear 18 can rotate around the second center gear 19.

[0029] A rotating arm 9 is provided on one side of the planetary gear assembly 200 . The rotating arm 9 is connected to the first gear ring 6 via a first clutch 7 . The transverse axis 24 passes through the rotating arm 9 . The first clutch 7 is used to realize the connection and disconnection between the rotating arm 9 and the first gear ring 6 .

[0030] The planetary gear assembly 200 includes a sun gear 10, a fourth planetary gear 11, a second ring gear 12, a third clutch 13, a second brake 14 and a planet carrier 15. The sun gear 10 is fixedly connected to the swing arm 9. The sun gear 10 is provided with a second ring gear 12. The fourth planetary gear 11 is meshed with the sun gear 10 and the second ring gear 12. The second brake 14 is connected to the second ring gear 12. The swing arm 9 is connected to the second gear 12 through the third clutch 13. The fourth planetary gear 11 is connected to the limited slip differential assembly 100 through the planet carrier 15. The second brake 14 controls the fixation and floating of the second ring gear 12. The rotation of the sun gear 10 causes the fourth planetary gear 11 to rotate in the second ring gear 12. The third clutch 13 controls the connection and disconnection of the swing arm 9 and the second ring gear 12. The planet carrier 15 is connected to the fourth planetary gear 11. When the fourth planetary gear 11 rotates around the sun gear 10, the planet carrier 15 rotates.

[0031] The limited slip differential assembly 100 includes a differential assembly 17 and a parking brake 16. The parking brake 16 is connected to the differential assembly 17. One side of the differential assembly 17 is connected to the left half-shaft 1, and the other side of the differential assembly 17 is connected to the right half-shaft 22. The differential assembly 17 transmits power to the left half-shaft 1 and the right half-shaft 22, and realizes differential rotation of the left half-shaft 1 and the right half-shaft 22. The parking brake using the P gear is installed on the differential assembly 100, which effectively ensures the safe parking of the vehicle in a stationary state.

[0032] The differential assembly 17 is provided with a dog clutch 23 , and the engagement or disengagement of the dog clutch 23 controls whether the differential planetary gear rotates, thereby realizing the differential limited slip function.

[0033] The left half shaft 1 and the right half shaft 22 are coaxially arranged, and wheels are provided at the ends of the left half shaft 1 and the right half shaft 22 respectively, so as to ensure that the wheels of the left half shaft 1 and the right half shaft 22 can be controlled under the drive of the transmission device, thereby realizing stable operation of the vehicle.

[0034] It should be noted that in the following description of the present invention, the brake working means that the clutch connects the two components, and the brake not working means that the two components are separated; the clutch working means that the clutch connects the two components, and the clutch not working means that the two components are separated.

[0035] In summary, when using the electric drive axle transmission device:

[0036] Reference Figure 2When the transmission is in the first gear, the first brake 5 and the second brake 14 are engaged, the first clutch 7 and the second clutch 13 are disconnected, and the power transmission route can be output by the following two power routes 1 or both ( Figure 2 ):

[0037] 1) Power route 1 (the third clutch 20 is not engaged): main motor EM1 → first center gear → first center gear → second center gear → swing arm → sun gear → planetary gear → planetary carrier → limited slip differential assembly → wheel;

[0038] The main motor 2 is working, and the power output end of the main motor 2 drives the first center wheel 3 to rotate, the rotation of the first center wheel 3 causes the first planetary wheel 4 to rotate, the rotation of the first planetary wheel 4 causes the transverse shaft 24 to drive the second planetary wheel 8 to rotate, the rotation of the transverse shaft 24 causes the rotating arm 9 to rotate, the rotation of the rotating arm 9 causes the sun gear 10 to rotate, the rotation of the sun gear 10 causes the fourth planetary gear 11 to rotate, the rotation of the fourth planetary gear 11 causes the planet carrier 15 to rotate, the rotation of the planet carrier 15 causes the limited slip differential assembly 100 to drive the left half shaft 1 and the right half shaft 22 to rotate, thereby realizing the rotation of the wheels on the left half shaft 1 and the right half shaft 22.

[0039] 2) Power route 2 (the third clutch 20 is engaged): auxiliary motor EM2→second center gear→third center gear→second center gear→swing arm→sun gear→planetary gear→planetary carrier→limited slip differential assembly→wheel.

[0040] The auxiliary motor 21 works, and the power output end of the auxiliary motor 21 drives the second center wheel 19 to rotate. The rotation of the second center wheel 19 drives the third planetary wheel 18 to rotate along the axis of the second center wheel 19 while rotating itself, and then the transverse shaft 24 drives the second planetary wheel 8 to rotate. The rotation of the second planetary wheel 8 causes the rotating arm 9 to rotate. The rotation of the rotating arm 9 causes the sun wheel 10 to rotate. The rotation of the sun wheel 10 causes the fourth planetary wheel 11 to rotate. The rotation of the fourth planetary wheel 11 causes the planet carrier 15 to rotate. The rotation of the planet carrier 15 causes the limited slip differential assembly 100 to drive the left half shaft 1 and the right half shaft 22 to rotate, thereby realizing the rotation of the wheels on the left half shaft 1 and the right half shaft 22.

[0041] Reference Figure 3 When the transmission is in the second gear, the first brake 5 and the second clutch 13 are disconnected, the second brake 14 and the first clutch 7 are engaged, and the power transmission route can be output through the following two power routes 1 or both:

[0042] 1) Power route 1 (the third clutch 20 is not engaged): main motor EM1 → swing arm → sun gear → planetary gear → planetary carrier → limited slip differential assembly → wheel;

[0043] The main motor 2 is working, and the power output end of the main motor 2 drives the swing arm 9 to rotate. The rotation of the swing arm 9 causes the sun gear 10 to rotate. The rotation of the sun gear 10 causes the fourth planetary gear 11 to rotate. The rotation of the fourth planetary gear 11 causes the planet carrier 15 to rotate. The rotation of the planet carrier 15 causes the limited slip differential assembly 100 to drive the left half shaft 1 and the right half shaft 22 to rotate, thereby realizing the rotation of the wheels on the left half shaft 1 and the right half shaft 22.

[0044] 2) Power route 2 (the third clutch 20 is engaged): auxiliary motor EM2 → swing arm → sun gear → planetary gear → planetary carrier → limited slip differential assembly → wheel;

[0045] The auxiliary motor 21 works, and the power output end of the auxiliary motor 21 drives the rotating arm 9 to rotate. The rotation of the rotating arm 9 causes the sun gear 10 to rotate. The rotation of the sun gear 10 causes the fourth planetary gear 11 to rotate. The rotation of the fourth planetary gear 11 causes the planet carrier 15 to rotate. The rotation of the planet carrier 15 causes the limited slip differential assembly 100 to drive the left half shaft 1 and the right half shaft 22 to rotate, thereby realizing the rotation of the wheels on the left half shaft 1 and the right half shaft 22.

[0046] Reference Figure 4 When the transmission is in the third gear, the first brake 5 and the second brake 14 are disconnected, the first clutch 7 and the second clutch 13 are engaged, and the power transmission route can be output through the following two power routes 1 or both:

[0047] Power route 1 (the third clutch 20 is not engaged): main motor EM1 → limited slip differential assembly → wheels;

[0048] The main motor 2 is working, and the power output end of the main motor 2 directly transmits power to the limited slip differential assembly 100, so that the limited slip differential assembly 100 drives the left half shaft 1 and the right half shaft 22 to rotate, thereby realizing the rotation of the wheels on the left half shaft 1 and the right half shaft 22.

[0049] Power route 2 (the third clutch 20 is engaged): auxiliary motor EM2 → limited slip differential assembly → wheels;

[0050] The auxiliary motor 21 works, and the power output end of the auxiliary motor 21 directly transmits power to the limited slip differential assembly 100, so that the limited slip differential assembly 100 drives the left half shaft 1 and the right half shaft 22 to rotate, thereby realizing the rotation of the wheels on the left half shaft 1 and the right half shaft 22.

[0051] Reference Figure 5 When the transmission is in gear R, the first brake 5 and the second brake 14 are engaged, the first clutch 7 and the second clutch 13 are disconnected, and the main motor 2 is driven in reverse. At this time, the power transmission route is as follows:

[0052] Power route: main motor EM1 → first center wheel → first center wheel → second center wheel → swing arm → sun wheel → planetary wheel → planetary carrier → limited slip differential assembly → wheel;

[0053] The main motor 2 works in reverse rotation, and the power output end of the main motor 2 drives the first center wheel 3 to reverse, the reversal of the first center wheel 3 causes the first planetary wheel 4 to reverse, the reversal of the first planetary wheel 4 causes the transverse shaft 24 to drive the second planetary wheel 8 to reverse, the reversal of the transverse shaft 24 causes the swing arm 9 to reverse, the reversal of the swing arm 9 causes the sun gear 10 to reverse, the reversal of the sun gear 10 causes the fourth planetary gear 11 to reverse, the reversal of the fourth planetary gear 11 causes the planet carrier 15 to reverse, the reversal of the planet carrier 15 causes the limited slip differential assembly 100 to drive the left half shaft 1 and the right half shaft 22 to reverse, thereby realizing the reversal of the wheels on the left half shaft 1 and the right half shaft 22.

[0054] Under the above working conditions, the dog clutch 23 is engaged, and the differential assembly 100 is an integral output, thereby realizing the limited slip function.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-speed coaxial electric drive axle transmission device, comprising a left half shaft (1), a right half shaft (22) and a limited slip differential assembly (100), wherein the left half shaft (1) is provided with a main motor (2), the right half shaft (22) is provided with an auxiliary motor (21), and two output sides of the limited slip differential assembly (100) are respectively connected to the left half shaft (1) and the right half shaft (22), characterized in that: The left half shaft (1) is provided with a first planetary gear mechanism and a planetary gear assembly (200), the right half shaft (22) is provided with a second planetary gear mechanism, and the main motor (2), the auxiliary motor (21), the first planetary gear mechanism, the planetary gear assembly (200), the second planetary gear mechanism and the limited slip differential assembly (100) are coaxially arranged.

2. The multi-speed coaxial electric drive axle transmission device according to claim 1, characterized in that: The first planetary gear mechanism comprises a first center wheel (3), a first planetary wheel (4), a first ring gear (6), a second planetary wheel (8) and a transverse shaft (24); the first center wheel (3) is coaxially arranged with the left half shaft (1); the first center wheel (3) is connected with the main motor (2); the first ring gear (6) is arranged outside the first center wheel (3); the first planetary wheel (4) is meshed with the first center wheel (3); the first planetary wheel (4) is connected with the second planetary wheel (8) via the transverse shaft (24); and the second planetary wheel (8) is meshed with the first ring gear (6).

3. The multi-speed coaxial electric drive axle transmission device according to claim 2, characterized in that: A first brake (5) is provided on the first gear ring (6).

4. The multi-speed coaxial electric drive axle transmission device according to claim 2, characterized in that: The second planetary gear mechanism comprises a third planetary gear (18), a second center gear (19) and a third clutch (20); the third planetary gear (18) is connected to the transverse shaft (24); the third planetary gear (18) is meshed with the second center gear (19); and the second center gear (19) is connected to the power output end of the auxiliary motor (20) via the third clutch (20).

5. The multi-speed coaxial electric drive axle transmission device according to claim 4, characterized in that: A rotating arm (9) is provided on one side of the planetary gear assembly (200); the rotating arm (9) is connected to the first gear ring (6) via a first clutch (7); and the transverse axis (24) passes through the rotating arm (9).

6. The multi-speed coaxial electric drive axle transmission device according to claim 5, characterized in that: The planetary gear assembly (200) comprises a sun gear (10), a fourth planetary gear (11), a second ring gear (12), a third clutch (13), a second brake (14) and a planet carrier (15); the sun gear (10) is fixedly connected to a swing arm (9); a second ring gear (12) is provided outside the sun gear (10); the fourth planetary gear (11) is meshed with the sun gear (10) and the second gear (12); the second brake (14) is connected to the second ring gear (12); the swing arm (9) is connected to the second gear (12) via the third clutch (13); and the fourth planetary gear (11) is connected to a limited slip differential assembly (100) via the planet carrier (15).

7. The multi-speed coaxial electric drive axle transmission device according to claim 6, characterized in that: The limited slip differential assembly (100) comprises a differential assembly (17) and a parking brake (16), wherein the parking brake (16) is connected to the differential assembly (17), one side of the differential assembly (17) is connected to the left half shaft (1), and the other side of the differential assembly (17) is connected to the right half shaft (22).

8. The multi-speed coaxial electric drive axle transmission device according to claim 7, characterized in that: The differential assembly (17) is provided with a dog clutch (23).

9. The multi-speed coaxial electric drive axle transmission device according to claim 8, characterized in that: The left half shaft (1) and the right half shaft (22) are coaxially arranged, and wheels are respectively arranged at the ends of the left half shaft (1) and the right half shaft (22).

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