Dual-motor dual-clutch multi-gear electric drive axle system

Abstract

The invention belongs to the technical field of electric drive axles, and particularly relates to a dual-motor dual-clutch multi-gear electric drive axle system which comprises a power input unit, a clutch unit and a transmission unit. The planetary gear train system is in transmission connection with the output end of the power input unit; the input end of the double-clutch speed change unit is in transmission connection with the output end of the planetary gear train system; the input end of the power output unit is in transmission connection with the output end of the double-clutch speed change unit; the planetary gear train system comprises a planet carrier and a planetary gear train, wherein one end of the planet carrier is in transmission connection with the output end of the power input unit; the planet wheel set is rotationally arranged at the other end of the planet carrier, the planet wheel set comprises two planet wheels which are coaxially and fixedly connected, one planet wheel is meshed with a fixed sun wheel which is fixedly connected to the axle housing, the other planet wheel is meshed with a non-fixed sun wheel which is fixedly connected to the axle housing, and the non-fixed sun wheel is fixedly connected to the axle housing. And the output end of the non-fixed sun gear is in transmission connection with the output end of the double-clutch speed change unit.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric drive axles, and in particular relates to a dual-motor, dual-clutch, multi-gear electric drive axle system. Background Art

[0002] As an important way to reduce greenhouse gas emissions and improve air quality, new energy vehicles have received global attention and promotion.

[0003] As the development direction of new energy vehicle powertrain, electric drive axle has become the commanding heights that major companies are competing for. Companies are actively making plans in order to gain an advantage in future market competition.

[0004] However, the current electric transmission systems mostly use traditional clutches, which have the problems of high cost, complicated structure, large size, slow heat dissipation and low transmission efficiency. Based on the above situation, we propose a dual-motor, dual-clutch, multi-gear electric drive axle system designed specifically for new energy vehicles. Summary of the invention

[0005] The purpose of the present invention is to provide a dual-motor dual-clutch multi-gear electric drive axle system to solve the above problems.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A dual-motor dual-clutch multi-gear electric drive axle system, comprising:

[0008] Power input unit;

[0009] A planetary gear system, drivingly connected to the output end of the power input unit;

[0010] A dual-clutch transmission unit, the input end of which is drivingly connected to the output end of the planetary gear system;

[0011] A power output unit, the input end of which is drivingly connected to the output end of the dual-clutch transmission unit;

[0012] The planetary gear system comprises:

[0013] A planet carrier, one end of which is drivingly connected to the output end of the power input unit;

[0014] A planetary gear set is rotatably arranged at the other end of the planet carrier, and the planetary gear set includes two coaxially fixed planetary gears, one of which is meshed with a fixed sun gear, and the fixed sun gear is fixed to the bridge housing, and the other planetary gear is meshed with a non-fixed sun gear, and the output end of the non-fixed sun gear is transmission-connected to the output end of the dual-clutch transmission unit.

[0015] Optionally, the input end of the dual-clutch transmission unit is driven by a power transmission gear 2, the power transmission gear 2 is meshed with a power transmission gear 1, and the power transmission gear 1 is connected to the non-fixed sun gear shaft.

[0016] Optionally, the dual-clutch transmission unit has a first gear, a second gear, a third gear and a reverse gear, and the dual-clutch transmission unit is used to control the vehicle to switch between the first gear, the second gear, the third gear and the reverse gear.

[0017] Optionally, the dual-clutch transmission unit includes:

[0018] case;

[0019] A double clutch is arranged in the housing, and the double clutch includes an upper half clutch and a lower half clutch;

[0020] The main shaft 1 is movably arranged in the housing, and after the main shaft 1 moves, it is combined with the upper half clutch to make the main shaft 1 rotate; the upper shaft of the main shaft 1 is connected with a third gear input gear and a reverse gear input gear;

[0021] The second main shaft is movably arranged in the housing, and after the second main shaft moves, it is combined with the lower half clutch to rotate the second main shaft; the upper shaft of the second main shaft is connected to a first gear input gear and a second gear input gear;

[0022] A first gear output gear, meshingly arranged with the first gear input gear;

[0023] A second-gear output gear, meshingly arranged with the second-gear input gear;

[0024] After the second main shaft moves, the first gear output gear meshes with the first gear input gear or the second gear output gear meshes with the second gear input gear;

[0025] A third-speed output gear, which is meshed with the third-speed input gear;

[0026] A reverse gear output gear is arranged to be meshed with the reverse gear input gear via an internal gear;

[0027] When the main shaft moves, the third gear output gear meshes with the third gear input gear or the reverse gear output gear meshes with the internal gear;

[0028] A first power output gear, coaxially fixedly connected with the second gear output gear and the reverse gear output gear;

[0029] A second power output gear is coaxially fixedly connected with the first-gear output gear and the third-gear output gear;

[0030] A coupling gear is arranged between the first power output gear and the second power output gear, and the coupling gear is meshed with the first power output gear and the second power output gear.

[0031] Optionally, the power output unit includes:

[0032] A power output main shaft, one end of which is connected to the wheel transmission through a differential structure; the other end of which is connected to the coupling gear shaft.

[0033] Optionally, the differential structure includes an ordinary bevel gear differential, the input shaft of the ordinary bevel gear differential is axially connected to one end of the power output main shaft, and the two output ends of the ordinary bevel gear differential are respectively axially connected to a left half shaft and a right half shaft, and the left half shaft and the right half shaft are respectively connected to the wheel transmission.

[0034] Optionally, the power input unit includes:

[0035] A power combining shaft, one end of which is axially connected to one end of the planetary frame, and the other end of which is drivingly connected to the output end of the driving unit.

[0036] Optionally, the driving unit includes at least one driving motor, and the driving motor is drivingly connected to the power combining shaft.

[0037] Optionally, the driving unit includes a first driving motor and a second driving motor;

[0038] The output end shaft of the first drive motor is connected to one end of the output shaft of the first drive motor, and the other end of the output shaft of the first drive motor is transmission-connected to the power combining shaft through gear matching;

[0039] The output end shaft of the second drive motor is connected to the second drive motor output shaft, and the other end of the second drive motor output shaft is drivingly connected to the power combining shaft through gear matching;

[0040] The first drive motor and the second drive motor simultaneously drive the power combining shaft to rotate.

[0041] Compared with the prior art, the present invention has the following advantages and technical effects:

[0042] When in use, power is input through the power input unit, and the power is transmitted to the dual-clutch transmission unit through the planetary gear system. The appropriate gear is selected through the dual-clutch transmission unit, and the power is output to the wheels through the power output unit to move the vehicle. The planetary gear system drives the planetary gear set to rotate through the planetary carrier, and the non-fixed sun gear is rotated through the planetary gear set to output power to the dual-clutch transmission unit. The planetary gear system is mainly responsible for speed regulation and torque increase, while effectively reducing the volume, increasing the transmission ratio range, and achieving high integration. By mainly using the planetary gear system and the dual-clutch transmission unit, the device has a simple structure, less consumables, and low cost. At the same time, the use of a dual clutch can effectively improve the gear shift response rate. The two clutches can achieve semi-clutching instantly, making the gear shift smoother and achieving gapless gear shifting, which greatly improves driving comfort. The entire system has a compact structure, improved integration, and leaves more space for the chassis of the vehicle, while achieving lightweight axles. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:

[0044] Figure 1 It is a schematic diagram of the structure of the present invention;

[0045] Figure 2 It is a schematic diagram of the structure of the dual-clutch transmission unit of the present invention;

[0046] Among them, 1. the first drive motor; 2. the output shaft of the first drive motor; 3. the second drive motor; 4. the output shaft of the second drive motor; 5. the power merging shaft; 6. the fixed sun gear; 7. the planetary carrier; 8. the planetary gear set; 9. the non-fixed sun gear; 10. the power transmission gear one; 11. the power transmission gear two; 12. the dual clutch; 13. the reverse gear output gear; 14. the internal gear; 15. the reverse gear input gear; 16. the third gear input gear; 17. the third gear output gear; 18. the second gear input gear; 19. the second gear output gear; 20. the first power output gear; 21. the first gear input gear; 22. the first gear output gear; 23. the second power output gear; 24. the power output main shaft; 25. the ordinary bevel gear differential; 26. the left half shaft; 27. the right half shaft. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0049] Reference Figure 1 to Figure 2 The present invention discloses a dual-motor dual-clutch multi-gear electric drive axle system, comprising:

[0050] Power input unit;

[0051] A planetary gear system drivingly connected to an output end of a power input unit;

[0052] A dual-clutch transmission unit, the input end of which is drivingly connected to the output end of the planetary gear system;

[0053] A power output unit, the input end of which is transmission-connected to the output end of the dual-clutch transmission unit;

[0054] The planetary gear system includes:

[0055] A planet carrier 7, one end of which is drivingly connected to the output end of the power input unit;

[0056] The planetary gear set 8 is rotatably arranged at the other end of the planet carrier 7. The planetary gear set 8 includes two coaxially fixed planetary gears, one of which is meshed with a fixed sun gear 6, and the fixed sun gear 6 is fixed to the bridge housing, and the other planetary gear is meshed with a non-fixed sun gear 9, and the output end of the non-fixed sun gear 9 is transmission-connected to the output end of the dual-clutch transmission unit.

[0057] When in use, power is input through the power input unit, and the power is transmitted to the dual-clutch transmission unit through the planetary gear system. The appropriate gear is selected through the dual-clutch transmission unit, and the power is output to the wheels through the power output unit to move the vehicle, wherein the planetary gear system drives the planetary gear set 8 to rotate through the planetary carrier 7, and the non-fixed sun gear 9 is rotated through the planetary gear set 8 to output power to the dual-clutch transmission unit. The planetary carrier 7 serves as a supporting structure to fix the planetary gear in an appropriate position while allowing the planetary gear to rotate and revolve. This compact spatial layout enables the planetary gear system to achieve efficient transmission within a limited volume, and the planetary gear system can achieve a larger transmission ratio, mainly because of its combination of multi-stage gear transmission and the dual movement of the planetary gear. The rotation of the planetary gear can achieve a higher speed change; the revolution of the planetary gear further amplifies the transmission ratio. This dual movement mechanism enables the planetary gear system to achieve a larger transmission ratio range in a smaller space. By mainly using a planetary gear system and a dual-clutch transmission unit, the device has a simple structure, few consumables, and low cost. At the same time, the use of a dual clutch can effectively improve the gear shift response rate. The two clutches can instantly achieve half-clutching, making the gear shift smoother and achieving gapless gear shifting, which greatly improves driving comfort. The entire system has a compact structure and improved integration, leaving more space for the chassis of the vehicle and achieving lightweight axles.

[0058] As an optional implementation, the input end of the dual-clutch transmission unit is driven by a power transmission gear 2 11 , the power transmission gear 2 11 is meshed with a power transmission gear 1 10 , and the power transmission gear 1 10 is axially connected to the non-fixed sun gear 9 .

[0059] As an optional implementation, the dual-clutch transmission unit has a first gear, a second gear, a third gear and a reverse gear, and the dual-clutch transmission unit is used to control the vehicle to switch between the first gear, the second gear, the third gear and the reverse gear.

[0060] As an optional implementation, the dual-clutch transmission unit includes:

[0061] case;

[0062] A double clutch 12 is disposed in the housing, and the double clutch 12 includes an upper half clutch and a lower half clutch;

[0063] The main shaft 1 is movably arranged in the housing. After the main shaft 1 moves, it is combined with the upper clutch to rotate the main shaft 1. The upper shaft of the main shaft 1 is connected with the third gear input gear 16 and the reverse gear input gear 15.

[0064] The second main shaft is movably arranged in the housing. After the second main shaft moves, it is combined with the lower half clutch to rotate the second main shaft. The upper shaft of the second main shaft is connected to the first gear input gear 21 and the second gear input gear 18.

[0065] The first gear output gear 22 is meshed with the first gear input gear 21;

[0066] The second gear output gear 19 is meshed with the second gear input gear 18;

[0067] After the second main shaft moves, the first gear output gear 22 is meshed with the first gear input gear 21 or the second gear output gear 19 is meshed with the second gear input gear 18;

[0068] A third-gear output gear 17 is meshed with the third-gear input gear 16;

[0069] The reverse gear output gear 13 is meshed with the reverse gear input gear 15 through the internal gear 14;

[0070] Once the main shaft moves, the third gear output gear 17 meshes with the third gear input gear 16 or the reverse gear output gear 13 meshes with the internal gear 14;

[0071] The first power output gear 20 is coaxially fixedly connected with the second gear output gear 19 and the reverse gear output gear 13;

[0072] The second power output gear 23 is coaxially fixedly connected with the first gear output gear 22 and the third gear output gear 17;

[0073] The coupling gear is disposed between the first power output gear 20 and the second power output gear 23 , and the coupling gear is meshed with the first power output gear 20 and the second power output gear 23 .

[0074] As an optional implementation, the power output unit includes:

[0075] A power output main shaft 24, one end of which is drivingly connected to the wheels through a differential structure; and the other end of the power output main shaft 24 is connected to a coupling gear shaft.

[0076] As an optional embodiment, the differential structure includes a common bevel gear differential 25, the input shaft of the common bevel gear differential 25 is axially connected to one end of the power output main shaft 24, and the two output ends of the common bevel gear differential 25 are respectively axially connected to the left half shaft 26 and the right half shaft 27, and the left half shaft 26 and the right half shaft 27 are respectively connected to the wheel transmission.

[0077] As an optional implementation, the power input unit includes:

[0078] The power combining shaft 5 has one end connected to one end of the planet carrier 7, and the other end of the power combining shaft 5 is drivingly connected to the output end of the driving unit.

[0079] One end of the power combining shaft 5 passes through the center of the fixed sun gear 6 and is axially connected to one end of the planet carrier 7 , and the power combining shaft 5 and the fixed sun gear 6 rotate in coordination.

[0080] As an optional implementation, the driving unit includes at least one driving motor, and the driving motor is drivingly connected to the power merging shaft 5 .

[0081] As an optional implementation, the driving unit includes a first driving motor 1 and a second driving motor 3;

[0082] The output end of the first drive motor 1 is connected to one end of the first drive motor output shaft 2, and the other end of the first drive motor output shaft 2 is connected to the power combining shaft 5 through gear matching;

[0083] The output end of the second drive motor 3 is connected to the second drive motor output shaft 4, and the other end of the second drive motor output shaft 4 is transmission-connected to the power combining shaft 5 through gear matching;

[0084] The first drive motor 1 and the second drive motor 3 simultaneously drive the power combining shaft 5 to rotate.

[0085] The working principle of the present invention is as follows:

[0086] The first drive motor 1 and the second drive motor 3 are responsible for outputting power, and the power combining shaft 5 is responsible for coupling the power output. The number of motors to be used can be independently selected according to the working conditions.

[0087] The fixed sun gear 6 is fixed on a frame such as a bridge housing, and a planetary gear system is composed of the fixed sun gear 6, a planetary carrier 7, a planetary gear set 8 and a non-fixed sun gear 9. The input shaft is the planetary carrier 7 connected to the power merging shaft 5, and the output shaft is the non-fixed sun gear 9. The non-fixed sun gear 9 is connected to a power transmission gear 10, and the power transmission gear 10 is meshed with a power transmission gear 2 11. The planetary gear system is mainly responsible for speed regulation and torque increase, while effectively reducing the volume, increasing the transmission ratio range, and achieving a high degree of integration.

[0088] The dual clutch 12 is divided into two clutches, K1 and K2. K1 connects the first gear consisting of the first gear input gear 21 and the first gear output gear 22 and the second gear consisting of the second gear input gear 18 and the second gear output gear 19. K2 connects the third gear consisting of the third gear input gear 16 and the third gear output gear 17 and the reverse gear consisting of the reverse gear output gear 13, the internal gear 14 and the reverse gear input gear 15.

[0089] The two clutches can work separately. When the K1 clutch is used, the hydraulic oil forces the clutch K1 to be pressed against the clutch plate, and K2 is separated. At this time, K1 and the first and second gears are integrated. When the gear is not in use, the first and second gear output gears idle. When the gear is in use, the electronically controlled hydraulics drive the gears to fit with the output shaft and output through the power output main shaft. The same applies to K2.

[0090] refer to Figure 1If the shift system C1 fails, you can focus on checking the first and second gear related gears and K1 clutch. If the shift system C2 fails, you can focus on checking the third gear and reverse gear related gears and K2 clutch, which improves maintenance efficiency.

[0091] The ordinary bevel gear differential 25 realizes the free turning of the two wheels, balances the speed difference, improves the passability, and completes the power distribution.

[0092] The first drive motor 1 and the second drive motor 3 transmit power to the first drive motor output shaft 2 and the second drive motor output shaft 4. The power merging shaft 5 is driven by the first drive motor output shaft 2 and the second drive motor output shaft 4 and is responsible for power merging or power transmission. The power merging shaft 5 is connected to the planetary carrier 7. The planetary carrier 7 drives the planetary gear set 8 to rotate around the axis. The planetary gear set 8 rotates and meshes with the non-fixed sun gear 9 and drives it to rotate. The non-fixed sun gear 9 is connected to the power transmission gear 1 10. The power transmission gear 1 10 meshes with the power transmission gear 2 11. The power transmission gear 2 11 transmits power to the dual clutch 12. The dual clutch 12 selects the gear as needed to transmit power to the ordinary bevel gear differential 25. The ordinary bevel gear differential 25 is responsible for distributing power to the left half shaft 26 and the right half shaft 27.

[0093] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0094] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A dual-motor dual-clutch multi-gear electric drive axle system, characterized in that: include: Power input unit; A planetary gear system, drivingly connected to the output end of the power input unit; A dual-clutch transmission unit, the input end of which is drivingly connected to the output end of the planetary gear system; A power output unit, the input end of which is drivingly connected to the output end of the dual-clutch transmission unit; The planetary gear system comprises: A planet carrier (7), one end of the planet carrier (7) being drivingly connected to the output end of the power input unit; A planetary gear set (8) is rotatably arranged at the other end of the planet carrier (7), the planetary gear set (8) comprising two coaxially fixed planetary gears, one of which is meshed with a fixed sun gear (6), the fixed sun gear (6) being fixed to the bridge housing, and the other of which is meshed with a non-fixed sun gear (9), the output end of the non-fixed sun gear (9) being drivingly connected to the output end of the dual-clutch transmission unit.

2. The dual-motor dual-clutch multi-gear electric drive axle system according to claim 1, characterized in that: The input end of the dual-clutch transmission unit is driven by a power transmission gear 2 (11), the power transmission gear 2 (11) is meshed with a power transmission gear 1 (10), and the power transmission gear 1 (10) is axially connected to the non-fixed sun gear (9).

3. The dual-motor dual-clutch multi-gear electric drive axle system according to claim 1, characterized in that: The dual-clutch transmission unit has a first gear, a second gear, a third gear and a reverse gear, and is used to control the vehicle to switch between the first gear, the second gear, the third gear and the reverse gear.

4. The dual-motor dual-clutch multi-gear electric drive axle system according to claim 1, characterized in that: The dual-clutch transmission unit comprises: case; A double clutch (12) is arranged in the housing, the double clutch (12) comprising an upper clutch and a lower clutch; A main shaft 1 is movably arranged in the housing, and after the main shaft 1 moves, it is combined with the upper clutch to rotate the main shaft 1; the upper shaft of the main shaft 1 is connected to a third gear input gear (16) and a reverse gear input gear (15); A second main shaft is movably arranged in the housing, and after the second main shaft moves, it is combined with the lower clutch to rotate the second main shaft; the upper shaft of the second main shaft is connected to a first gear input gear (21) and a second gear input gear (18); a first-gear output gear (22) which is meshable with the first-gear input gear (21); A second-gear output gear (19) meshing with the second-gear input gear (18); After the second main shaft moves, the first gear output gear (22) is meshed with the first gear input gear (21) or the second gear output gear (19) is meshed with the second gear input gear (18); A third-gear output gear (17) meshing with the third-gear input gear (16); A reverse gear output gear (13) is arranged to be meshed with the reverse gear input gear (15) via an internal gear (14); When the main shaft moves, the third gear output gear (17) meshes with the third gear input gear (16) or the reverse gear output gear (13) meshes with the internal gear (14); A first power output gear (20) is coaxially fixedly connected to the second gear output gear (19) and the reverse gear output gear (13); A second power output gear (23) is coaxially fixedly connected to the first-gear output gear (22) and the third-gear output gear (17); A coupling gear is arranged between the first power output gear (20) and the second power output gear (23), and the coupling gear is meshed with the first power output gear (20) and the second power output gear (23).

5. The dual-motor dual-clutch multi-gear electric drive axle system according to claim 4, characterized in that: The power output unit comprises: A power output main shaft (24), one end of the power output main shaft (24) being transmission-connected to the wheels via a differential structure; and the other end of the power output main shaft (24) being shaft-connected to the coupling gear.

6. The dual-motor dual-clutch multi-gear electric drive axle system according to claim 5, characterized in that: The differential structure comprises a common bevel gear differential (25), the input shaft of the common bevel gear differential (25) being axially connected to one end of the power output main shaft (24), the two output ends of the common bevel gear differential (25) being axially connected to a left half shaft (26) and a right half shaft (27), respectively, and the left half shaft (26) and the right half shaft (27) being respectively connected to the wheels in a transmission manner.

7. The dual-motor dual-clutch multi-gear electric drive axle system according to claim 1, characterized in that: The power input unit comprises: A power combining shaft (5), one end of the power combining shaft (5) being axially connected to one end of the planet carrier (7), and the other end of the power combining shaft (5) being drivingly connected to the output end of the driving unit.

8. The dual-motor dual-clutch multi-gear electric drive axle system according to claim 7, characterized in that: The driving unit comprises at least one driving motor, and the driving motor is drivingly connected to the power combining shaft (5).

9. The dual-motor dual-clutch multi-gear electric drive axle system according to claim 7, characterized in that: The driving unit comprises a first driving motor (1) and a second driving motor (3); The output end shaft of the first drive motor (1) is connected to one end of the first drive motor output shaft (2), and the other end of the first drive motor output shaft (2) is transmission-connected to the power combining shaft (5) through gear matching; The output end shaft of the second drive motor (3) is connected to the second drive motor output shaft (4), and the other end of the second drive motor output shaft (4) is transmission-connected to the power combining shaft (5) through gear matching; The first drive motor (1) and the second drive motor (3) simultaneously drive the power combining shaft (5) to rotate.

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