阅读说明：本技术 具有单个执行器的多模式转矩定向分配电动驱动桥 (Multi-mode torque-directed distribution electric transaxle with single actuator ) 是由 王军年 张春林 刘哲 管畅洋 高守林 于 2021-09-06 设计创作，主要内容包括：本发明公开了一种具有单个执行器的多模式转矩定向分配电动驱动桥,包括主电机、副电机、差速器、左半轴、右半轴、主减速器、副减速器、第三行星排、双联齿轮机构、三相位执行器等。主电机和副电机分别与主减速器和副减速器的输入端连接；主减速器和副减速器的输出端分别与差速器壳体、第三行星排输入端相连；第三行星排两个输出端分别与三相位执行器以及双联齿轮机构相连；双联齿轮机构输出端与差速器壳体连接；三相位执行器为同步换挡机构,工作在左、中、右三个位置可分别实现第三行星排闭锁、第三行星排解耦和第三行星排与左半轴的连接。通过控制三相位执行器,即可实现主电机单独驱动、双电机转矩耦合驱动以及转矩定向分配三种驱动模式。(The invention discloses a multi-mode torque directional distribution electric drive axle with a single actuator, which comprises a main motor, an auxiliary motor, a differential, a left half shaft, a right half shaft, a main speed reducer, an auxiliary speed reducer, a third planet row, a duplicate gear mechanism, a three-phase actuator and the like. The main motor and the auxiliary motor are respectively connected with the input ends of the main speed reducer and the auxiliary speed reducer; the output ends of the main speed reducer and the auxiliary speed reducer are respectively connected with the differential shell and the input end of the third planet row; two output ends of the third planet row are respectively connected with the three-phase actuator and the duplicate gear mechanism; the output end of the duplicate gear mechanism is connected with the differential shell; the three-phase actuator is a synchronous gear shifting mechanism, and can respectively realize locking of the third planetary row, decoupling of the third planetary row and connection of the third planetary row and a left half shaft when working at a left position, a middle position and a right position. Three driving modes of independent driving of a main motor, double-motor torque coupling driving and directional torque distribution can be realized by controlling the three-phase actuator.)

1. A multi-mode torque vectoring electric transaxle having a single actuator, comprising:

the main motor is used for outputting driving torque and driving the automobile to run;

the output torque of the auxiliary motor can be used for realizing the function of directional distribution of the torque or serving as a power-assisted motor which is used for being coupled with the torque of the main motor to drive the automobile to run together;

a left flange;

a right flange;

a left half shaft;

a right half shaft;

a differential for equally distributing torque transmitted to a differential case thereof to the left and right half shafts and allowing the left and right half shafts to rotate at different angular velocities;

the double gear mechanism is used for reducing the speed and increasing the torque transmitted to the double gear mechanism and then transmitting the torque to the differential shell;

the main speed reducer is used for reducing the speed and increasing the torque of the output torque of the main motor and then transmitting the output torque to the differential shell;

the auxiliary speed reducer is used for reducing the speed and increasing the torque of the output torque of the auxiliary motor and then outputting the output torque;

the three-phase actuator is used for controlling the multi-mode torque directional distribution electric drive bridge with the single actuator to be switched to a main motor single drive mode, a dual-motor torque coupling mode or a torque directional distribution mode;

the third planet row is used for converting the output torque of the auxiliary speed reducer into a pair of opposite unequal torques and applying the opposite unequal torques to the left half shaft and the duplicate gear mechanism respectively under the control of the three-phase actuator, or directly outputting the torque output by the auxiliary motor to the duplicate gear mechanism in a planet row locking mode, or realizing self decoupling and disengagement transmission;

the main casing body, be used for the holding main reducer, vice reduction gear the third planet row differential mechanism duplicate gear mechanism with three phase actuator, and fixed main motor vice motor.

2. A multi-mode torque vectoring electric drive axle with a single actuator as claimed in claim 1 wherein said primary motor is a hollow shaft inner rotor permanent magnet synchronous motor comprising: the main motor comprises a main motor rotor output shaft, a main motor stator and a main motor shell; the main motor, the right flange and the right half shaft are arranged on one side of the differential mechanism together; the torque generated by the main motor is output through the rotor output shaft of the main motor; the main motor shell is fixed on the right side of the main shell through bolts, and an internal cavity formed by the main motor shell is used for accommodating the main motor stator and the main motor rotor output shaft; the right half shaft penetrates out of the center of the main motor in an empty sleeve mode;

the auxiliary motor is a hollow shaft inner rotor permanent magnet synchronous motor, which comprises: an output shaft of the auxiliary motor rotor, an auxiliary motor stator and an auxiliary motor shell; the auxiliary motor, the left flange and the left half shaft are arranged on the other side of the differential mechanism together; the torque generated by the auxiliary motor is output through an output shaft of the auxiliary motor rotor; the auxiliary motor shell is fixed on the left side of the main shell through bolts, and an inner cavity formed by the auxiliary motor shell is used for accommodating the auxiliary motor stator and the auxiliary motor rotor output shaft; and the left half shaft penetrates out of the center empty sleeve of the auxiliary motor.

3. A multi-mode torque vectoring electric transaxle having a single actuator as claimed in claim 1 wherein the main reducer is a single row, single stage planetary gear mechanism comprising: the first sun gear is in splined connection with the output shaft of the main motor rotor; the first gear ring is fixedly connected with the main shell; the first planet gear is simultaneously meshed with the first sun gear and the first gear ring for transmission; a first planetary gear shaft for rotatably supporting the first planetary gear; the first planet carrier is used for supporting the first planet gear shaft, and the left side of the first planet carrier is fixedly connected with the right side of the differential shell;

the main body of the auxiliary speed reducer is a single-row single-stage planetary gear mechanism, and the auxiliary speed reducer comprises: the second sun gear is in splined connection with the output shaft of the auxiliary motor rotor; the second gear ring is fixedly connected with the main shell; the second planet wheel is in meshing transmission with the second sun wheel and the second gear ring simultaneously; a second planet gear shaft for rotatably supporting the second planet gear; and the second planet carrier is used for supporting the second planet gear shaft and is used as the output end of the auxiliary speed reducer.

4. A multi-mode torque vectoring electric transaxle having a single actuator in accordance with claim 1 wherein said third planetary row has a body that is a single row single stage planetary spur gear mechanism comprising: a third sun gear having a wide tooth width and being adapted to be slidably engaged; the third gear ring is fixedly connected with the right end of the second planet carrier; the third planet gear is simultaneously meshed with the third sun gear and the third gear ring for transmission; a third planetary gear shaft for rotatably supporting the third planetary gear; a third planet carrier for supporting the third planet pins.

5. A multi-mode torque vectoring electric drive axle with a single actuator as claimed in claim 1, wherein said dual gear mechanism comprises: the first gear is fixedly connected with the right side of the third planet carrier; the second gear is fixedly connected with the left side of the differential shell; a left pinion of the duplicate gear is in external meshing transmission with the first gear, and a right gearwheel of the duplicate gear is in external meshing transmission with the second gear; a duplicate gear shaft for rotatably supporting the duplicate gear and fixed to the main housing;

to ensure that the torque of the half shaft on the side of torque increase increases when the transaxle is switched to the torque vector distribution modeA torque reduction amount equivalent to a half shaft on the torque reduction side in large number, the requirement for the number of gear teeth of the double gear mechanism being:wherein Z₁The number of teeth of the first gear, wherein Z₂Number of teeth of left pinion of said double gear, wherein Z₃The number of teeth of the right gearwheel of the duplicate gear, wherein Z₄Number of teeth of the second gear, k₃Is a planet row characteristic parameter of the third planet row.

6. A multi-mode torque vectoring electric transaxle having a single actuator of claim 1 wherein said three phase actuator comprises:

a synchronizer;

the screw rod nut device comprises a nut and a screw rod and is used for converting the rotary motion of the screw rod into the translational motion of the nut, and the nut and the screw rod can realize reverse transmission self-locking;

the fork head of the shifting fork is processed into a semi-ring shape, and the tail part of the shifting fork is fixedly connected with the nut;

and the power output end of the actuating motor is fixedly connected with the lead screw.

7. A multi-mode torque vectoring electric transaxle having a single actuator of claim 6 wherein the synchronizer comprises:

the spline hub is provided with a spline on the outer ring, a blind hole is formed in the middle of the spline from outside to inside, and the inner ring is rotatably supported on the left half shaft;

the left side of the outer ring of the joint sleeve is fixedly connected with the third sun gear into a whole, and the right side of the outer ring of the joint sleeve is provided with a rectangular groove for connecting with a shifting fork head and can translate among a left working phase, a middle working phase and a right working phase under the driving of the shifting fork head;

a spring mounted in the splined hub blind bore;

the locking steel balls are arranged in the spline hub blind holes and on the outer ends of the springs and can be clamped in the circular arc-shaped grooves;

the left synchronizing ring is arranged on the left side of the spline hub, an inner friction conical surface is processed on the left side of the spline hub, spline teeth are processed on the left side part of the outer ring of the left synchronizing ring, and the left synchronizing ring can be connected with the inner spline of the joint sleeve when the shifting fork drives the joint sleeve to move leftwards;

the right synchronizing ring is arranged on the right side of the spline hub, an inner friction conical surface is processed on the right side of the spline hub, spline teeth are processed on the right side part of the outer ring of the right synchronizing ring, and the right synchronizing ring can be connected with an inner spline of the joint sleeve when the shifting fork drives the joint sleeve to move rightwards;

the left combination gear ring is arranged on the left side of the left synchronizing ring, spline teeth are machined on the right side of the outer ring of the left combination gear ring, the left combination gear ring can be connected with the inner spline of the joint sleeve when the joint sleeve is driven by the shifting fork to move leftwards, an outer friction conical surface is machined on the right side of the left combination gear ring, the right combination gear ring is opposite to the inner friction conical surface of the left synchronizing ring, and the left side of the left combination gear ring is fixedly connected with the second planet carrier;

and the right combination gear ring is arranged on the right side of the right synchronizing ring, spline teeth are processed on the left side part of the outer ring of the right combination gear ring, the right combination gear ring can be connected with the inner spline of the joint sleeve when the joint sleeve is driven by the shifting fork to move rightwards, an outer friction conical surface is processed on the left side of the right combination gear ring, the outer friction conical surface is opposite to the inner friction conical surface of the right synchronizing ring, and a spline is processed on the inner ring of the right combination gear ring and is connected with the left half shaft spline.

8. The multi-mode torque-directed distribution electric transaxle of claim 1 wherein the left flange is splined to the outer end of the left axle shaft to output torque from the left axle shaft to a left side wheel of the vehicle; the left flange is axially locked on the left half shaft through a locking nut; the right flange is in splined connection with the outer end of the right half shaft and outputs the torque of the right half shaft to the right wheel of the automobile; the right flange is axially locked to the right axle shaft by a lock nut.

9. A multi-mode torque vectoring electric transaxle having a single actuator of claim 7 wherein,

when the joint sleeve is positioned in the middle and is not combined with the left combined gear ring or the right combined gear ring, the multi-mode torque directional distribution electric drive axle with the single actuator works in a main motor single drive mode;

when the joint sleeve translates leftwards and is combined with the left combined gear ring, the multi-mode torque directional distribution electric drive axle with the single actuator works in a double-motor torque coupling mode;

when the joint sleeve is translated to the right and combined with the right combined gear ring, the multi-mode torque-oriented distribution electric drive axle with the single actuator works in a torque-oriented distribution mode.

10. A multi-mode torque vectoring electric transaxle having a single actuator, comprising:

the main motor is used for outputting driving torque and driving the automobile to run;

the output torque of the auxiliary motor can be used for realizing a torque directional distribution function or is used for being coupled with the main motor in a torque mode;

a left flange;

a right flange;

a left half shaft;

a right half shaft;

a differential for equally distributing torque transmitted to a differential case thereof to the left and right half shafts and allowing the left and right half shafts to rotate at different angular velocities;

the main speed reducer is used for reducing the speed and increasing the torque of the output torque of the main motor and then transmitting the output torque to the differential shell;

the auxiliary speed reducer is used for reducing the speed and increasing the torque of the output torque of the auxiliary motor and then outputting the output torque;

a third planetary row whose body is a single row single stage planetary gear mechanism comprising: a third sun gear having a wide tooth width and being adapted to be slidably engaged; the third planet wheel is in meshing transmission with the third sun gear; the third gear ring is in meshing transmission with the third planet gear; a third planetary gear shaft for rotatably supporting the third planetary gear; the third planet carrier is used for supporting the third planet gear shaft and is fixedly connected with the output end of the auxiliary speed reducer;

three phase executor, it can work in left, middle, three right working phase place, includes:

when the multi-mode torque directional distribution electric drive axle works in the left working phase, the connection between the third planet carrier and the third sun gear can be realized, and at the moment, the multi-mode torque directional distribution electric drive axle with the single actuator is switched to a double-motor torque coupling drive mode;

when the multi-mode torque directional distribution electric drive axle with the single actuator is switched to a main motor single drive mode, the third planet carrier can be separated from the third sun gear when the multi-mode torque directional distribution electric drive axle works in the middle working phase;

when the multi-mode torque directional distribution electric drive axle with the single actuator is switched to a torque directional distribution mode, the connection between the third sun gear and the left half shaft can be realized when the multi-mode torque directional distribution electric drive axle works in the right working phase;

the duplicate gear mechanism is used for transmitting the torque transmitted to the differential mechanism after changing the magnitude and the direction, and comprises: the fourth gear ring is fixedly connected with the third gear ring; the second gear is fixedly connected with the left side of the differential shell; a left pinion of the duplicate gear is in internal meshing transmission with the fourth gear ring, and a right gearwheel of the duplicate gear is in external meshing transmission with the second gear; a duplicate gear shaft for rotatably supporting the duplicate gear and fixed to the main housing; to ensure that the torque increase amount of the torque increase-side half shaft is equal to the torque decrease amount of the torque decrease-side half shaft when the transaxle is switched to the torque vector distribution mode, the requirement for the number of gear teeth of the double gear mechanism is:wherein Z₁Is the number of teeth of the fourth ring gear, wherein Z₂Number of teeth of left pinion of said double gear, wherein Z₃The number of teeth of the right gearwheel of the duplicate gear, wherein Z₄Number of teeth of the second gear, k₃Is a planet row characteristic parameter of the third planet row.

Technical Field

The invention belongs to the field of electric automobile transmission, and particularly relates to a highly-integrated multi-mode torque directional distribution electric drive axle with a single actuator.

Background

In recent years, with the development and progress of society, electric vehicles featuring zero fuel consumption, high integration, fast power response, high drivability, and the like have been vigorously developed and gradually received market approval. With the development and popularization of the market, the electric vehicle will be developed toward high-end, high-performance, diversified and personalized directions in the future, and thus the demand for an advanced driving technology capable of improving the performance of the chassis is increasing. And the electric torque directional distribution technology is one of the technologies.

The torque directional distribution (TV) technology is an advanced driving technology in which a driving torque generated by a power source is arbitrarily distributed between left and right wheels, or between a front axle and a rear axle. This technique may be used to transfer the drive torque from the low-speed side wheels (or axles) to the high-speed side wheels (or axles), or from the high-speed side to the low-speed side. Therefore, the technology can overcome the defect that the traditional open differential has no differential speed and no torque difference, improve the control flexibility and the turning maneuverability, balance the road adhesion utilization rate of each tire, increase the stability margin of the vehicle, effectively increase the driving control stability of the vehicle, and distribute the all-wheel driving torque by taking energy conservation as the target according to the difference of control targets.

The technology is currently mainly divided into two categories: one is a torque directional distribution control technique applied to a distributed drive automobile represented by an in-wheel motor drive automobile, which can realize directional distribution of torque among wheels by directly controlling the drive torque of in-wheel motors of the wheels; however, the torque directional distribution control technology is not applied to automobiles in a large scale due to the problems that the power density of a hub motor is low, the unsprung mass is increased and the like at present. The other is the torque-oriented distribution differential (transaxle) applied in centralized drive, which has been applied in some high-end sport cars and high-end SUVs, such as super four-wheel drive system (SH-AWD) of honda, super active yaw control System (SAYC) of mitsubishi, and kinematic differential of audi. However, these torque directional distribution differentials are mainly applied to conventional fuel vehicles, and generally adopt mechanical friction type torque directional distribution mechanisms such as a multi-plate clutch, etc., which results in limited torque transfer capability of the system, low mechanical transmission efficiency, low reliability, complex structure and high cost.

In addition, at present, the technology of the power battery for the vehicle is not broken through, the transmission efficiency of the electric vehicle is improved, the loss of the energy of the battery is reduced, and the method is an important way for ensuring the endurance mileage of the electric vehicle. In order to ensure the dynamic property of the automobile, the traditional single-motor drive axle only can select a high-power motor to meet the power requirement of the extreme working condition, so that the phenomenon that a trolley is pulled by a large horse of the motor is caused, and the utilization rate of the high-efficiency interval of the motor is small. The dual-motor coupling driving technology can enable the automobile to be switched to the main motor for independent driving when the required driving torque is small; when the required driving torque is large, the mode is switched to the dual-motor torque coupling mode. Therefore, the load rate of the driving motor is improved, the high-efficiency interval utilization rate of the driving motor is improved, and the automobile obtains larger driving range on the basis of the original battery capacity.

At present, the application of the drive axle in electric automobiles is rarely reported whether the drive axle is a dual-motor parallel coupling drive in consideration of high-efficiency drive and energy conservation or a torque directional distribution drive axle for improving the vehicle bending maneuverability and the operation stability. Two invention patents, namely a two-motor coupling drive axle with torque directional distribution function (CN106965659A) and a two-motor coupling drive axle with torque directional distribution function (CN106965662A), which are only applied by the applicant in 2017 at present relate to the technical content in the field. The patent also can make the TV control motor which is idle in straight line driving at ordinary times converted into a power-assisted motor which can participate in driving by controlling the switching of four groups of clutches on the basis of realizing the function of directional distribution of torque, thereby realizing the torque coupling mode driving of two motors, driving the automobile to drive together, and improving the dynamic property of the automobile under the working conditions of large torque requirements such as climbing of the automobile, urgent acceleration and the like; in addition, the coupling power of the two motors is distributed and adjusted, so that respective high-efficiency intervals are fully exerted, and more energy-saving and high-efficiency driving running is realized. However, the technical scheme needs to adopt four groups of clutches and seven planet rows in total, and has the technical problems of complex structure, large axial length and high control difficulty.

The invention aims at the background content and the defects of the prior art, and provides a multi-mode torque directional distribution electric drive axle with a single actuator, which is applied to a centralized drive electric automobile, wherein only one actuator is used, and three working modes can be realized by matching with the use of a planet row and a duplicate gear: a main motor single drive mode, a dual motor torque coupling mode, and a torque directional distribution mode. Structurally, the drive axle only uses one actuator, so that the production and manufacturing cost and the control difficulty are effectively reduced, and in addition, the high efficiency advantage of planet row locking is fully utilized in a double-motor torque coupling mode, so that the transmission efficiency of the drive axle is further improved; in the aspect of work, the drive axle can effectively improve the operation stability, trafficability, dynamic property and economy of the electric automobile by switching different working modes, and has important engineering application value and social significance.

Disclosure of Invention

The invention aims to provide a multi-mode torque directional distribution electric drive axle with a single actuator, which is applied to a centralized drive electric automobile, has a compact structure and can realize three working modes: a main motor single drive mode, a dual motor torque coupling mode, and a torque directional distribution mode. The multi-mode torque-directional distribution electric drive axle with the single actuator can be switched among three operation modes by controlling the operation state of the single actuator.

Under the independent driving mode of the main motor, only the main motor outputs torque, and the driving device is mainly applied to the working condition that the torque required by automobile driving is smaller so as to improve the load rate of the main motor, enable the main motor to work in a high-efficiency interval and reduce the efficiency loss of the motor.

Under the dual-motor torque coupling mode, the auxiliary motor plays a role of a power-assisted motor, is coupled with the main motor in a torque manner, and drives the automobile to run together, so that the dynamic property of the automobile is improved. In addition, the coupling power of the two motors is distributed and adjusted, so that respective high-efficiency intervals are fully exerted, and more energy-saving and high-efficiency driving running is realized.

Under the torque directional distribution mode, the driving torque output by the multi-mode torque directional distribution electric drive axle with the single actuator can be randomly distributed between the half shafts on the two sides, the defect that the traditional open differential mechanism is not poor in differential speed and torsion is overcome, the operation stability of the automobile can be effectively improved, the driving pleasure of a driver is improved, and the automobile has better economical efficiency and trafficability.

In order to realize the purpose, the following technical scheme is adopted:

a multi-mode torque vectoring electric transaxle having a single actuator, comprising:

the main motor is used for outputting driving torque and driving the automobile to run;

the output torque of the auxiliary motor can be used for realizing the function of directional distribution of the torque or serving as a power-assisted motor which is used for being coupled with the torque of the main motor to drive the automobile to run together;

a left flange;

a right flange;

a left half shaft;

a right half shaft;

a differential for equally distributing torque transmitted to a differential case to the left and right half shafts and allowing the left and right half shafts to rotate at different angular velocities;

and the duplicate gear mechanism is used for reducing the speed and increasing the torque transmitted to the double-gear mechanism and then transmitting the torque to the differential shell.

The main speed reducer is used for reducing the speed and increasing the torque of the output torque of the main motor and then transmitting the output torque to the differential shell;

the auxiliary speed reducer is used for reducing the speed and increasing the torque of the output torque of the auxiliary motor and then outputting the output torque;

the three-phase actuator is used for controlling the multi-mode torque directional distribution electric drive bridge with the single actuator to be switched to a main motor single drive mode, a dual-motor torque coupling mode or a torque directional distribution mode;

the third planet row is used for converting the output torque of the auxiliary speed reducer into a pair of opposite unequal torques and applying the opposite unequal torques to the left half shaft and the duplicate gear mechanism respectively under the control of a three-phase actuator, or directly outputting the torque output by the auxiliary motor through self-locking of the planet row, or realizing self-decoupling and self-disengaging transmission;

the main casing body is used for accommodating the main speed reducer, the auxiliary speed reducer, the third planet row, the differential mechanism, the duplicate gear mechanism, the three-phase actuator and the like, and fixing the main motor and the auxiliary motor.

The main motor is a hollow shaft inner rotor permanent magnet synchronous motor, which comprises: the main motor comprises a main motor rotor output shaft, a main motor stator and a main motor shell; the main motor, the right flange and the right half shaft are arranged on one side of the differential mechanism together; the torque generated by the main motor is output through the rotor output shaft of the main motor; the main motor shell is fixed on the right side of the main shell through bolts, and an internal cavity formed by the main motor shell is used for accommodating the main motor stator and the main motor rotor output shaft; the right half shaft penetrates out of the center hollow sleeve of the main motor.

The auxiliary motor is a hollow shaft inner rotor permanent magnet synchronous motor, which comprises: an output shaft of the auxiliary motor rotor, an auxiliary motor stator and an auxiliary motor shell; the auxiliary motor, the left flange and the left half shaft are arranged on the other side of the differential mechanism together; the torque generated by the auxiliary motor is output through an output shaft of the auxiliary motor rotor; the auxiliary motor shell is fixed on the left side of the main shell through bolts, and an inner cavity formed by the auxiliary motor shell is used for accommodating the auxiliary motor stator and the auxiliary motor rotor output shaft; and the left half shaft penetrates out of the center empty sleeve of the auxiliary motor.

The main reducer of which the main body is a single-row single-stage planetary gear mechanism, comprises: the first sun gear is in splined connection with the output shaft of the main motor rotor; the first gear ring is fixedly connected with the main shell; the first planet gear is simultaneously meshed with the first sun gear and the first gear ring for transmission; a first planetary gear shaft for rotatably supporting the first planetary gear; and the left side of the first planet carrier is fixedly connected with the right side of the differential shell.

Preferably, the left side of the first carrier is splined to the right side of the differential case.

The main body of the auxiliary speed reducer is a single-row single-stage planetary gear mechanism, and the auxiliary speed reducer comprises: the second sun gear is in splined connection with the output shaft of the auxiliary motor rotor; the second gear ring is fixedly connected with the main shell; the second planet wheel is in meshing transmission with the second sun wheel and the second gear ring simultaneously; a second planet gear shaft for rotatably supporting the second planet gear; and the second planet carrier is used for supporting the second planet gear shaft and is used as the output end of the auxiliary speed reducer.

The third planet row, its main part is a single rank single-stage planet straight-tooth gear mechanism, includes: a third sun gear having a wide tooth width and being adapted to be slidably engaged; the third gear ring is fixedly connected with the right end of the second planet carrier; the third planet gear is simultaneously meshed with the third sun gear and the third gear ring for transmission; a third planetary gear shaft for rotatably supporting the third planetary gear; a third planet carrier for supporting the third planet pins.

The duplicate gear mechanism includes: the first gear is fixedly connected with the right side of the third planet carrier; the second gear is fixedly connected with the left side of the differential shell; a left pinion of the duplicate gear is in external meshing transmission with the first gear, and a right gearwheel of the duplicate gear is in external meshing transmission with the second gear; a duplicate gear shaft for rotatably supporting the duplicate gear and fixed to the main housing;

to ensure that the torque increase amount of the torque increase-side half shaft is equal to the torque decrease amount of the torque decrease-side half shaft when the transaxle is switched to the torque vector distribution mode, the requirement for the number of gear teeth of the double gear mechanism is:wherein Z₁The number of teeth of the first gear, wherein Z₂Number of teeth of left pinion of said double gear, wherein Z₃The number of teeth of the right gearwheel of the duplicate gear, wherein Z₄Number of teeth of the second gear, k₃Is a planet row characteristic parameter of the third planet row.

Preferably, the first gear is integrally formed with the third carrier, and the second gear is integrally formed with the differential case.

The three-phase actuator includes:

the screw rod nut device comprises a nut and a screw rod and is used for converting the rotary motion of the screw rod into the translational motion of the nut, and the nut and the screw rod can realize reverse transmission self-locking;

the fork head of the shifting fork is processed into a semi-ring shape, and the tail part of the shifting fork is fixedly connected with the nut;

the power output end of the execution motor is fixedly connected with the lead screw;

a synchronizer, comprising: the spline hub is provided with a spline on the outer ring, a blind hole is formed in the middle of the spline from outside to inside, and the inner ring is rotatably supported on the left half shaft; the joint sleeve is a cylindrical part, an inner spline with a circular arc-shaped groove in the middle is machined on the inner ring of the joint sleeve, the inner spline is connected with the spline hub and the outer spline in a sliding mode, the left side of the outer ring of the joint sleeve is fixedly connected with the third sun gear, a rectangular groove is machined on the right side of the outer ring of the joint sleeve and used for being connected with the shifting fork head, and the joint sleeve can translate among a left working phase, a middle working phase and a right working phase under the driving of the shifting fork head; a spring mounted in the splined hub blind bore; the locking steel balls are arranged in the spline hub blind holes and on the outer ends of the springs and can be clamped in the circular arc-shaped grooves; the left synchronizing ring is arranged on the left side of the spline hub, an inner friction conical surface is processed on the left side of the spline hub, spline teeth are processed on the left side part of the outer ring of the left synchronizing ring, and the left synchronizing ring can be connected with the inner spline of the joint sleeve when the shifting fork drives the joint sleeve to move leftwards; the right synchronizing ring is arranged on the right side of the spline hub, an inner friction conical surface is processed on the right side of the spline hub, spline teeth are processed on the right side part of the outer ring of the right synchronizing ring, and the right synchronizing ring can be connected with an inner spline of the joint sleeve when the shifting fork drives the joint sleeve to move rightwards; the left combination gear ring is arranged on the left side of the left synchronizing ring, spline teeth are machined on the right side of the outer ring of the left combination gear ring, the left combination gear ring can be connected with the inner spline of the joint sleeve when the joint sleeve is driven by the shifting fork to move leftwards, an outer friction conical surface is machined on the right side of the left combination gear ring, the right combination gear ring is opposite to the inner friction conical surface of the left synchronizing ring, and the left side of the left combination gear ring is fixedly connected with the second planet carrier; and the right combination gear ring is arranged on the right side of the right synchronizing ring, spline teeth are processed on the left side part of the outer ring of the right combination gear ring, the right combination gear ring can be connected with the inner spline of the joint sleeve when the joint sleeve is driven by the shifting fork to move rightwards, an outer friction conical surface is processed on the left side of the right combination gear ring, the outer friction conical surface is opposite to the inner friction conical surface of the right synchronizing ring, and a spline is processed on the inner ring of the right combination gear ring and is connected with the left half shaft spline.

Preferably, the engaging sleeve is made in one piece with the third sun gear; preferably, the left combination ring gear is integrally formed with the second carrier.

The left flange is in splined connection with the outer end of the left half shaft and outputs the torque of the left half shaft to the left wheel of the automobile; and the locking nut is in threaded connection with the left half shaft at the center of the outer side of the left flange, so that the left flange is axially fixed.

The right flange is in splined connection with the outer end of the right half shaft and outputs the torque of the right half shaft to the right wheel of the automobile; and the locking nut is arranged at the center of the outer side of the right flange and is in threaded connection with the right half shaft, so that the right flange is axially fixed.

A multi-mode torque vectoring electric transaxle having a single actuator, comprising:

the main motor is used for outputting driving torque and driving the automobile to run;

the output torque of the auxiliary motor can be used for realizing a torque directional distribution function or is used for being coupled with the main motor in a torque mode;

a left flange;

a right flange;

a left half shaft;

a right half shaft;

a differential for equally distributing torque transmitted to a differential case thereof to the left and right half shafts and allowing the left and right half shafts to rotate at different angular velocities;

the main speed reducer is used for reducing the speed and increasing the torque of the output torque of the main motor and then transmitting the output torque to the differential shell;

the auxiliary speed reducer is used for reducing the speed and increasing the torque of the output torque of the auxiliary motor and then outputting the output torque;

a third planetary row whose body is a single row single stage planetary gear mechanism comprising: a third sun gear having a wide tooth width and being adapted to be slidably engaged; the third planet wheel is in meshing transmission with the third sun gear; the third gear ring is in meshing transmission with the third planet gear; a third planetary gear shaft for rotatably supporting the third planetary gear; the third planet carrier is used for supporting the third planet gear shaft and is fixedly connected with the output end of the auxiliary speed reducer;

three phase executor, it can work in left, middle, three right working phase place, includes:

when the multi-mode torque directional distribution electric drive axle works in the left working phase, the connection between the third planet carrier and the third sun gear can be realized, and at the moment, the multi-mode torque directional distribution electric drive axle with the single actuator is switched to a double-motor torque coupling drive mode;

when the multi-mode torque directional distribution electric drive axle with the single actuator is switched to a main motor single drive mode, the third planet carrier can be separated from the third sun gear when the multi-mode torque directional distribution electric drive axle works in the middle working phase;

when the multi-mode torque directional distribution electric drive axle with the single actuator is switched to a torque directional distribution mode, the connection between the third sun gear and the left half shaft can be realized when the multi-mode torque directional distribution electric drive axle works in the right working phase.

The duplicate gear mechanism is used for transmitting the torque transmitted to the differential mechanism after changing the magnitude and the direction, and comprises: the fourth gear ring is fixedly connected with the third gear ring; the second gear is fixedly connected with the left side of the differential shell; a left pinion of the duplicate gear is in internal meshing transmission with the fourth gear ring, and a right gearwheel of the duplicate gear is in external meshing transmission with the second gear; a duplicate gear shaft for rotatably supporting the duplicate gear and fixed to the main housing; to ensure that the torque increase amount of the torque increase-side half shaft is equal to the torque decrease amount of the torque decrease-side half shaft when the transaxle is switched to the torque vector distribution mode, the requirement for the number of gear teeth of the double gear mechanism is:wherein Z₁Is the number of teeth of the fourth ring gear, wherein Z₂Number of teeth of left pinion of said double gear, wherein Z₃The number of teeth of the right gearwheel of the duplicate gear, wherein Z₄Number of teeth of the second gear, k₃Is a planet row characteristic parameter of the third planet row.

A multi-mode torque-vectoring electric transaxle having a single actuator that can implement three modes of operation: a main motor single drive mode, a dual motor torque coupling mode, and a torque directional distribution mode. By controlling the working state of the three-phase actuator, the multi-mode torque directional distribution electric drive axle with the single actuator can be switched among three working modes. The working principle is as follows:

when the actuating motor works, the lead screw is driven to rotate, so that the nut drives the shifting fork to translate, and the combination sleeve connected with the shifting fork also translates along the axial direction of the half shaft. The joint sleeve can move leftwards or rightwards under the synchronous action of the synchronizer and is respectively combined with the left joint gear ring or the right joint gear ring, or can be positioned in the middle without being combined with the left joint gear ring or the right joint gear ring.

When the joint sleeve is positioned in the middle and is not combined with the left combined gear ring or the right combined gear ring, the multi-mode torque directional distribution electric drive axle with the single actuator works in a single drive mode of a main motor, the main motor outputs torque, the auxiliary motor does not participate in transmission, and a static state is maintained. In the mode, the torque output by the main motor is transmitted to the differential case after being decelerated and torque-increased by the main speed reducer, and is evenly distributed to the left half shaft and the right half shaft through the bevel gear differential. At this time, the torque output by the left half shaft and the right half shaft isWherein, T_lTorque output for the left half-shaft, T_rTorque, k, output for the right half shaft₁Is a characteristic parameter, T, of the main reducer planet row_m1Torque output for the main motor.

When the joint sleeve translates leftwards and is combined with the left combined gear ring, the multi-mode torque directional distribution electric drive axle with the single actuator works in a double-motor torque coupling mode, and the main motor and the auxiliary motor output torque. In the mode, the main motor rotates in the forward direction to output forward torque (assuming that the rotating direction of the main motor is positive when the automobile moves forwards), the output torque is transmitted to the differential shell after being decelerated and torque-increased by the main reducer, and is evenly distributed to the left and the right by the bevel gear differentialA half shaft; the torque output by the auxiliary motor is transmitted to the differential shell through the auxiliary speed reducer, the third planet row (locking) and the duplicate gear mechanism, and is averagely distributed to the left half shaft and the right half shaft. At this time, the torque output by the left half shaft and the right half shaft isWherein Z is₁Is the number of teeth of the first gear (the fourth ring gear), Z₂Number of teeth, Z, of pinions on left side of said duplicate gear₃The number of teeth, Z, of the right large gear of the duplicate gear₄Number of teeth of the second gear, k₂Is a characteristic parameter of the planetary row of the secondary reducer, T_m2The torque output for the auxiliary motor.

When the joint sleeve is translated to the right and combined with the right combined gear ring, the multi-mode torque-oriented distribution electric drive axle with the single actuator works in a torque-oriented distribution mode. In the mode, the torque output by the main motor is transmitted to the differential shell after being decelerated and torque-increased by the main speed reducer, and is evenly distributed to the left half shaft and the right half shaft; the torque output by the auxiliary motor is transmitted to the third planet row after being decelerated and torque-increased by the auxiliary speed reducer, and then is converted into a pair of unequal and opposite (unequal and same-direction) torques by the third planet row, wherein one torque is directly transmitted to the left half shaft, the other torque is converted into a torque which is equal and opposite to the torque transmitted to the left half shaft after passing through two pairs of gears which are simultaneously externally meshed (or internally meshed and externally meshed) in the duplicate gear mechanism, and then is applied to the differential mechanism shell, and is averagely distributed to the left half shaft and the right half shaft through the bevel gear differential mechanism, so that the directional distribution of the torques of the left half shaft and the right half shaft is realized. The directional distribution direction of the left and right half-axle moment is determined by the torque direction output by the auxiliary motor.

The invention has the beneficial effects that:

1. the multi-mode torque directional distribution electric drive axle with the single actuator can realize the directional distribution function of the torque of the left wheel and the right wheel on the electric automobile driven in a centralized manner by controlling the output torque of the auxiliary motor, so that the electric automobile driven in the centralized manner has the same excellent dynamic control characteristic as the electric automobile driven in a distributed manner; in addition, compared with the traditional ESP technology, the power loss is avoided, and the dynamic property, the economy, the operation stability, the active safety and the driving pleasure of the automobile can be effectively improved.

2. The multi-mode torque directional distribution electric drive axle with the single actuator can realize three working modes through the control of one actuator, effectively reduces the production and manufacturing cost and the control difficulty, only uses three planet rows and one duplicate gear mechanism, has high integral integration, compact structure and smaller size, improves the space utilization rate of the chassis of the automobile, and is convenient for the space arrangement of the chassis.

3. The multi-mode torque directional distribution electric drive axle with the single actuator can also realize two working modes, namely a main motor independent drive mode and a double-motor torque coupling mode. Under the working condition that the driving torque required by the automobile is smaller, the driving axle is switched to the main motor independent driving mode, the main motor drives the automobile to run independently, the load rate of the main motor can be effectively improved, the main motor works in an efficient interval, and the economy of the automobile is improved. Under the working condition that the driving torque required by the automobile is large, the driving axle is switched to a double-motor torque coupling mode, the main motor is coupled with the auxiliary motor in a torque coupling mode, and the automobile is driven to run together, so that the automobile has better acceleration capability and climbing capability, the dynamic property is better, the high-efficiency advantage of planet row locking is fully utilized, and the driving efficiency is further improved; in addition, the coupling power of the two motors is distributed and adjusted, so that respective high-efficiency intervals are fully exerted, and more energy-saving and high-efficiency driving running is realized.

Drawings

FIG. 1 is a schematic diagram of a first embodiment of a multi-mode torque-vectoring electric transaxle having a single actuator according to the present invention.

FIG. 2 is a block diagram of a first embodiment of a multi-mode torque-vectoring electric transaxle having a single actuator according to the present invention.

FIG. 3 is a partial block diagram of a first embodiment of a multi-mode torque-vectoring electric drive axle having a single actuator according to the present invention.

FIG. 4 is a schematic diagram of a second embodiment of a multi-mode torque-vectoring electric transaxle having a single actuator according to the present invention.

FIG. 5 is a schematic diagram of the torque flow of an embodiment of the multi-mode torque-directed distribution electric transaxle of the present invention having a single actuator in a main motor drive mode alone.

FIG. 6 is a schematic torque flow diagram of an embodiment of a multi-mode torque-directed distribution electric transaxle having a single actuator of the present invention in a dual motor torque coupling mode.

FIG. 7 is a schematic torque flow diagram of an embodiment of a multi-mode torque vectoring electric transaxle having a single actuator according to the present invention when increasing torque to the left wheels in the torque vectoring mode.

FIG. 8 is a schematic torque flow diagram of an embodiment of a multi-mode torque vectoring electric drive axle with a single actuator according to the present invention when increasing torque to the right wheel in the torque vectoring mode.

Detailed Description

The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.

Example one

As shown in fig. 1, 2 and 3, the torque directional distribution electric drive axle using a planetary row plus a double gear mainly includes: the three-phase differential gear comprises a main motor 100, an auxiliary motor 200, a left flange 903, a right flange 904, a left half shaft 901, a right half shaft 902, a bevel gear differential 800, a duplicate gear mechanism 600, a main reducer 300, an auxiliary reducer 400, a third planet row 500, a three-phase actuator 700 and a main shell 1001.

A main housing 1001 for accommodating the main reducer 300, the sub reducer 400, the third planetary gear set 500, the bevel gear differential 800, the duplicate gear mechanism 600, the three-phase actuator 700, and the like, and fixing the main motor 100 and the sub motor 200.

The main motor 100 is a hollow shaft inner rotor permanent magnet synchronous motor, and is arranged on the right side of the bevel gear differential 800 together with a right flange 904 and a right half shaft 902; the torque generated by the main motor 100 is output through the main motor rotor output shaft 103; the main motor shell 101 is fixed on the right side of the main shell 1001 through bolts 1003, and an internal cavity formed by the main motor shell is used for accommodating the main motor stator 102 and the main motor rotor output shaft 103; the right half shaft 902 penetrates through the center of the main motor 100 in an empty sleeve mode, and the main motor rotor output shaft 103 and the left center through hole of the main motor shell 101 are sealed through a rubber sealing ring III 909.

The auxiliary motor 200 is a hollow shaft inner rotor permanent magnet synchronous motor, and is arranged on the left side of the bevel gear differential 800 together with a left flange 903 and a left half shaft 901; the torque generated by the auxiliary motor 200 is output through an auxiliary motor rotor output shaft 203; the auxiliary motor shell 201 is fixed on the left side of the main shell 1001 through a bolt 1002, and an inner cavity formed by the auxiliary motor shell is used for accommodating the auxiliary motor stator 202 and the auxiliary motor rotor output shaft 203; the left half shaft 901 penetrates out of the center of the auxiliary motor 200 in an empty sleeve mode, and the auxiliary motor rotor output shaft 203 and a right center through hole of the auxiliary motor shell 201 are sealed through a rubber sealing ring II 908.

The bevel gear differential 800 is a differential formed by a planetary bevel gear mechanism, and mainly includes: a left sun bevel gear 801 splined to the inner end of the left half shaft 901; the right sun bevel gear 802 is in splined connection with the inner end of the right half shaft 902; the planetary bevel gears 803 are four in number, are uniformly arranged on the cross planet carrier 804 and are in meshed transmission with the left sun bevel gear 801 and the right sun bevel gear 802; a cross planetary carrier 804 for rotatably supporting the bevel pinion 803; a through hole is formed in the middle of a differential shell 805 for installing and fixing a cross planet carrier 804, the left side of the shell is machined into a second gear 602, and the right side of the shell is machined with an external spline.

The final drive 300 is a single-row single-stage planetary gear mechanism, and mainly includes: a first sun gear 301 spline-connected to the main motor rotor output shaft 103; a first ring gear 303 fixedly connected to the main housing 1001 by a spline; a first planetary gear 302 which is in mesh transmission with the first sun gear 301 and the first ring gear 303 at the same time; a first planetary gear shaft 304 for rotatably supporting the first planetary gear 302; the first planet carrier 305, which is rotatably supported on the main motor housing 103 at the right side, rotatably supports the first planet gear shaft 304, and is internally splined at the left side to be externally splined at the right side of the differential housing 805.

The counter reducer 400 is a single-row single-stage planetary gear mechanism, and mainly includes: a second sun gear 401 spline-connected to the sub motor rotor output shaft 203; a second ring gear 403 fixedly connected to the main housing 1001 by a spline; a second planetary gear 402 meshed with and driven by a second sun gear 401 and a second ring gear 403; a second planetary gear shaft 404 for rotatably supporting the second planetary gear 402; and a second carrier 405 rotatably supported on the sub motor housing 203 at a left side for rotatably supporting the second pinion shaft 404, having a right outer end formed as a third ring gear 503 and a right inner end formed as a left joint ring gear 701.

The third planetary row 500 is a single-row single-stage planetary straight-tooth gear mechanism, which mainly includes: the tooth width of the third sun gear 501 is wider than that of the third planet gear 502 meshed with the third sun gear, the tooth surface processing quality is good, and the third sun gear can be used for sliding meshing; a third ring gear 503; a third planet gear 502 which is simultaneously meshed with the third sun gear 501 and the third ring gear 503 for transmission; a third planetary gear shaft 504 for rotatably supporting the third planetary gear 502; and a third carrier 505 for supporting the third planetary gear shafts 504, the right end of which is formed as a first gear 601.

A dual gear mechanism 600 including a first gear 601; a second gear 602, which is made integral with the differential case 805; the duplicate gear 603 is rotatably supported on a duplicate gear shaft 604 through a needle bearing I605 and a needle bearing II 606, in addition, a left pinion of the duplicate gear is externally meshed and connected with the first gear 601, and a right gearwheel is externally meshed and driven with the second gear 602; the duplicate gear shaft 604 is fixed on the main housing 1001; to ensure that the torque increase amount of the torque increase-side half shaft is equal to the torque decrease amount of the torque decrease-side half shaft when the transaxle is switched to the torque vector distribution mode, the requirement for the number of gear teeth of the dual gear mechanism 600 is:wherein Z₁Is the number of teeth, Z, of the first gear 601₂Of pinions on the left hand side of the dual gear 603Number of teeth, Z₃The number of teeth, Z, of the right large gear of the dual gear 603₄The number of teeth, k, of the second gear 602₃Is the planet row characteristic parameter of the third planet row 500.

Three-phase actuator 700, comprising: a synchronizer, a shift fork 709, a screw nut device and an actuating motor 712; the screw nut device consists of a nut 710 and a screw 711, an inner rolling wire is processed in a through hole in the middle of the nut 710 and is connected with an outer rolling wire of the screw 711, and self-locking of the nut 710 and the screw 711 can be realized; the fork head of the shifting fork 709 is processed into a semi-annular shape, and the tail part of the shifting fork is fixedly connected with the nut 710; the output end of the actuator motor 712 is fixedly connected to the screw shaft 711.

A synchronizer, comprising: the spline hub 705 is provided with splines on the outer ring, blind holes are formed in the middle of the splines from outside to inside, and the inner ring is rotatably supported on the left half shaft 901 through a needle bearing IV 714; a joint sleeve 708 which is a cylindrical part, the inner ring of which is provided with an internal spline, the middle of the internal spline part is provided with a groove, the internal spline is connected with an external spline of a spline hub 705 in a sliding way, the left side of the outer ring of the joint sleeve is integrated with the third sun gear 501, and the right side of the outer ring of the joint sleeve is provided with a groove and connected with a fork head of a shifting fork 709; a spring 707 mounted in a blind bore of the splined hub 705; locking steel balls 706 mounted in the blind holes of the spline hub 705 and on the outer ends of the springs 707 and capable of being clamped in the spline grooves in the engaging sleeve 708; a left synchronizing ring 703 mounted on the left side of the spline hub 705, the left side having a friction cone machined thereon; a right synchronizing ring 704 installed on the right side of the spline hub 705, and right-side friction tapered surfaces are machined; the left combination gear ring 701 is arranged on the left side of the left synchronizing ring 703, and a friction conical surface is machined on the right side of the left combination gear ring and is opposite to the friction conical surface of the left synchronizing ring 703; and the right combined gear ring 702 is arranged on the right side of the right synchronizing ring 704, a friction conical surface is processed on the left side, the friction conical surface is opposite to the friction conical surface of the right synchronizing ring 704, and the inner end of the right combined gear ring is processed with a spline and is in spline connection with the left half shaft 901.

The left flange 903 is in splined connection with the outer end of the left half shaft 901 and outputs the torque of the left half shaft 901 to the left wheel of the automobile; a left end fixing nut 905 is in threaded connection with the left half shaft 901 at the center of the outer side of the left flange 903, so that the left flange 903 is axially fixed; the left flange 903 and the central through hole at the left side of the auxiliary motor shell 201 are sealed through a rubber sealing ring 907.

A right flange 904 in splined connection with the outer end of the right half shaft 902 for outputting the torque of the right half shaft 902 to the right wheel of the vehicle; a right end fixing nut 906 is in threaded connection with the right half shaft 902 at the center of the outer side of the right flange 904, so that the right flange 904 is axially fixed; the right flange 904 is sealed with the right central through hole of the main motor shell 101 by a rubber sealing ring four 910.

Example two

As shown in fig. 4

The third planet carrier 505 is fixedly connected with the right side of the second planet carrier 405; the third ring gear 503 is fixedly connected to the fourth ring gear 601.

In a duplicate gear 603 in the duplicate gear mechanism 600, a left pinion gear is in internal meshing transmission with a fourth gear ring 601, and a right gearwheel is in external meshing transmission with a second gear 602; to ensure that the torque increase amount of the torque increase-side half shaft is equal to the torque decrease amount of the torque decrease-side half shaft when the transaxle is switched to the torque vector distribution mode, the requirement for the number of gear teeth of the dual gear mechanism 600 is:wherein Z₁Number of teeth, Z, of the fourth ring gear 601₂The number of teeth of the left pinion of the dual gear 603, Z₃The number of teeth, Z, of the right large gear of the dual gear 603₄The number of teeth, k, of the second gear 602₃Is the planet row characteristic parameter of the third planet row 500.

The other structures in this embodiment are completely the same as those in the first embodiment.

The schematic diagrams of fig. 1, 3 and 4 are all the practical embodiment structural solutions of the torque-oriented distribution electric drive axle using planetary row plus dual gear according to the present invention, but considering the transmission ratio, the structural arrangement and other factors, the embodiment solution shown in fig. 1 is the best preferred solution.

The working principle of the torque directional distribution electric drive axle using the planetary row plus the dual gear according to the present invention will be further described in detail with reference to the drawings by taking the first embodiment as an example.

As shown, when the actuator motor 712 is operated to rotate the lead screw 711, the nut 710 drives the fork 709 to translate, and the coupling sleeve 708 connected to the fork 709 also translates along the axial direction of the half shaft. The engaging sleeve 708 can move left or right under the "synchronizing" action of the synchronizer, and is respectively combined with the left engaging gear ring 701 or the right engaging gear ring 702, or is positioned in the middle without being combined with the left engaging gear ring 701 or the right engaging gear ring 702.

When the engaging sleeve 708 is positioned in the middle and is not combined with the left combined gear ring 701 or the right combined gear ring 702, the multi-mode torque directional distribution electric drive axle with the single actuator works in a single drive mode of the main motor, the main motor 100 outputs torque, the auxiliary motor 200 does not participate in transmission, and the static state is maintained. In this mode, the torque output from the main motor 100 is reduced and torque is increased by the final drive 300, transmitted to the differential case 805, and distributed evenly to the left and right half shafts by the bevel gear differential 800. At this time, the left half-shaft 901 and the right half-shaft 902 output torques ofWherein, T_lTorque, T, output for the left half-shaft 901_rIs the torque, k, output by the right half-shaft 902₁Characteristic parameter of the main reducer 300 planet row, T_m1Is the torque output from the main motor 100.

When the engaging sleeve 708 is translated to the left to be combined with the left combined gear ring 701, the multi-mode torque directional distribution electric drive axle with the single actuator works in the dual-motor torque coupling mode, and the primary motor 100 and the secondary motor 200 output torques. In this mode, the main motor 100 rotates in the forward direction to output a forward torque (assuming that the rotation direction of the main motor is positive when the automobile moves forward), and the output torque is transmitted to the differential case 805 after being decelerated and torque-increased by the final drive 300 and is evenly distributed to the left half shaft and the right half shaft by the bevel gear differential 800; the auxiliary motor 200 rotates in the forward direction to output a forward torque, and the forward torque is transmitted to the differential case 805 through the auxiliary speed reducer 400, the third planetary row 500 and the duplicate gear mechanism 600, and is evenly distributed to the left half shaft and the right half shaft. At this time, the left half-shaft 901 and the right half-shaft 902 output torques ofWherein Z is₁Is the number of teeth, Z, of the first gear 601₂The number of teeth, Z, of the left large gear of the dual gear 603₃The number of teeth of the right pinion of the dual gear 603, Z₄The number of teeth, k, of the second gear 602₂Characteristic parameter of the planetary row of the secondary reducer 400, T_m2Is the torque output from the sub motor 200.

The multi-mode torque-vectoring electric transaxle with a single actuator operates in a torque-vectoring mode when clutch sleeve 708 translates to the right, engaging ring gear 702. In this mode, the torque output from the main motor 100 is transmitted to the differential case 805 after being decelerated and torque-increased by the final drive 300, and is equally distributed to the left and right half shafts; the torque output by the auxiliary motor 200 is decelerated and torque-increased by the auxiliary speed reducer 400, then transmitted to the third planetary row 500, then converted into a pair of unequal and opposite torques by the third planetary row 500, wherein one torque is directly transmitted to the left half shaft 901, and the other torque is converted into a torque which is equal and opposite to the torque transmitted to the left half shaft 901 by two pairs of gears which are simultaneously externally meshed in the dual gear mechanism 600, then applied to the differential case 805, and evenly distributed to the left half shaft and the right half shaft by the bevel gear differential 800, thereby realizing the directional distribution of the torques of the left half shaft and the right half shaft. At this time, the torque output by the left half shaft 901 is:the torque output by the right half-shaft 902 is:the direction of directional distribution of the left and right half-axis moments at this time depends on the direction of the torque output by the sub-motor 200. When the auxiliary motor 200 outputs a reverse torque, the torque of the left half shaft 901 is increased, and the torque of the right half shaft 902 is decreased; when the sub-motor 200 outputs a forward torque, the torque of the left half shaft 901 decreases and the torque of the right half shaft 902 increases.

While embodiments of the invention have been disclosed above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.