WO2023284141A1

WO2023284141A1 - Dual-motor drive system and application

Info

Publication number: WO2023284141A1
Application number: PCT/CN2021/123086
Authority: WO
Inventors: 张恒先; 周之光; 耿丽珍; 叶远龙; 田蕾
Original assignee: 奇瑞汽车股份有限公司
Priority date: 2021-07-16
Filing date: 2021-10-11
Publication date: 2023-01-19
Also published as: CN113335079B; CN113335079A

Abstract

A motor drive system comprises a planetary mechanism (7), a first motor (1), a first clutch (13), and a wheel shaft (20). The planetary mechanism (7) comprises a sun gear (701), a ring gear (704), multiple planet gears (702), a planet carrier (703), and a first input shaft (3). The sun gear (701) and the ring gear (704) are arranged concentrically, the multiple planet gears (702) are located between the sun gear (701) and the ring gear (704) and are meshed with the sun gear (701) and the ring gear (704), the planet carrier (703) is connected to the plurality of planet gears (702), and the first input shaft (3) is coaxially connected to the sun gear (701). The first motor (1) is connected to the first input shaft (3). The first clutch (13) is connected to the first input shaft (3) and is used to connect or disconnect the planet carrier (703) and the first input shaft (3). The wheel shaft (20) is transmittingly connected to the planet carrier (703). The system has a larger speed regulation range, improves transmission efficiency, and has a simple overall gearbox structure.

Description

Dual motor drive system and its application

This application claims the priority of the Chinese patent application with the application number 202110808776.6 and the title of the invention "dual motor drive system and application" filed on July 16, 2021, the entire contents of which are incorporated by reference in this application.

technical field

The invention relates to the technical field of automobile drive, in particular to a dual-motor drive system and its application.

Background technique

At present, oil resources are increasingly scarce and air pollution continues to worsen due to vehicle exhaust emissions. Finding new energy sources to replace fuel-driven vehicles has become a major research direction at present.

At present, electric vehicles, as a powerful competitive product of fuel vehicles, are developing very rapidly. Most of the driving systems of pure electric vehicles commonly used at present have a simple structure, integrating the motor with a hydraulic automatic transmission (AT), a mechanical continuously variable automatic transmission (CVT) or an electromechanical automatic transmission (AMT) gearbox. , The structure of the motor drive system is complex and the transmission efficiency is low.

Contents of the invention

The invention provides a dual-motor drive system and its application.

Technical scheme of the present invention is as follows:

In the first aspect, an embodiment of the present invention provides a dual-motor drive system, the system includes: a first motor, a second motor, a first input shaft, a third input shaft, a second input shaft, an output shaft, and a planetary row mechanism, first driving gear, second driving gear and first clutch;

The first input shaft is connected to the first motor, the first clutch and the planetary mechanism are mounted on the first input shaft, and a part of the first clutch is connected to the first input shaft , the other part of the first clutch is connected with the planetary mechanism;

The first driving gear is installed on the output end of the second input shaft, and the input end of the second input shaft is connected to the planetary mechanism;

The third input shaft is connected to the second motor, and the second driving gear is mounted on the third input shaft;

The output shaft is used to receive the power output by the first driving gear and the second driving gear.

Optionally, the planetary mechanism includes a sun gear, a plurality of planetary gears, a planet carrier and a ring gear;

Each of the planetary gears meshes with the outer round teeth of the sun gear and the inner round teeth of the ring gear respectively, and each of the planetary gears is rotatably arranged on the planetary gear shelf;

A part of the first clutch is connected to the first input shaft, and another part of the first clutch is connected to the planet carrier;

The ring gear is connected to the housing through a one-way clutch to prevent the first input shaft from reversing;

The planet carrier is connected to the second input shaft.

Optionally, the system also includes a second clutch;

The second clutch is mounted on the third input shaft.

Optionally, the system further includes a first driven gear, a second driven gear, an output gear and a differential;

The first driven gear, the second driven gear and the output gear are mounted on the output shaft;

The first driven gear meshes with the first driving gear to receive the power output by the first driving gear;

The second driven gear meshes with the second driving gear to receive the power output by the second driving gear;

The output gear is connected to the differential for transmitting power to the wheels.

Optionally, the system also includes an inverter and a battery;

One end of the inverter is electrically connected to the battery, and the other end is electrically connected to the first motor and the second motor connected in parallel.

In the second aspect, the embodiment of the present invention provides a motor drive system, including: a planetary gear mechanism, a first motor, a first clutch and a wheel shaft;

The planetary row mechanism includes a sun gear, a ring gear, a plurality of planetary gears, a planet carrier, and a first input shaft;

The sun gear and the ring gear are arranged concentrically, a plurality of planetary gears are located between the sun gear and the ring gear, and mesh with the sun gear and the ring gear, and the planet carrier is connected to multiple The planetary gears are connected, and the first input shaft is coaxially connected with the sun gear;

The first motor is connected to the first input shaft;

The first clutch is connected with the first input shaft, and is used to connect or disconnect the planet carrier with the first input shaft;

The wheel shaft is in transmission connection with the planet carrier.

Optionally, the driving part of the first clutch is connected with the first input shaft, and the driven part of the first clutch is connected with the planet carrier.

Optionally, the motor drive system further includes a speed change mechanism, the speed change mechanism includes a second input shaft, an output shaft and a speed change gear set, and the second input shaft and the output shaft are connected through the speed change gear set ;

The second input shaft is connected to the planet carrier, and the output shaft is connected to the wheel shaft in transmission.

Optionally, the transmission gear set includes a first input gear and a first output gear, the first input gear is coaxially connected with the second input shaft, and the first output gear is coaxial with the output shaft connect.

Optionally, the speed change mechanism further includes a third input shaft, and the third input shaft is connected to the output shaft through the transmission gear set;

The motor drive system also includes a second motor connected to the third input shaft.

Optionally, the transmission gear set further includes a second input gear and a second output gear, the second input gear is coaxially connected with the third input shaft, and the second output gear is coaxial with the output shaft. shaft connection.

Optionally, the motor drive system also includes a second clutch;

The second motor is connected to the third input shaft through the second clutch.

Optionally, the motor drive system also includes a differential and an output gear;

The output shaft is in transmission connection with the differential through the output gear, and the differential is connected with the wheel shaft.

Optionally, the motor drive system further includes a one-way clutch, and the ring gear is connected to the vehicle body through the one-way clutch.

Optionally, the motor drive system also includes an inverter and a battery;

The battery is electrically connected to the first motor and the second motor through the inverter.

In the third aspect, the embodiment of the present invention also provides the application of the system in the first aspect above in vehicle driving, and the application modes of the system include: single-motor drive mode, dual-motor drive mode, reverse mode and energy recovery mode.

Optionally, in the single motor drive mode,

The first motor does not work, the first clutch is disconnected, the second clutch is closed, the battery is discharged, the inverter supplies power to the second motor, and the second motor drives the third input shaft to rotate, and then transmits the power to the second motor in turn. Two driving gears, a second driven gear, an output shaft, an output gear and a differential, thereby driving the wheels to rotate;

Or, the second motor does not work, the first clutch is closed, the second clutch is disconnected, the battery is discharged, and the inverter supplies power to the first motor, and the first motor Drive the first input shaft, the planet carrier and the sun gear to rotate simultaneously, and then transmit the power to the second input shaft, the first driving gear, the first driven gear, the output shaft, the output gear and the differential in sequence device, thereby driving the wheel to rotate;

Or, the second motor does not work, the first clutch is disconnected, the second clutch is disconnected, the battery is discharged, and the inverter supplies power to the first motor, and the first The motor drives the first input shaft to rotate, and then transmits the power to the sun gear, multiple planetary gears, the planet carrier, the second input shaft, the first driving gear, the first slave driven gear, the output shaft, the output gear and the differential, thereby driving the wheels to rotate.

Optionally, in the dual-motor drive mode,

The first clutch is disconnected, the second clutch is closed, the battery is discharged, the inverter supplies power to the first motor and the second motor, and the first motor drives the first input shaft to rotate, and then the power is sequentially transmitted to the sun gear, A plurality of planetary gears, a planetary carrier, a second input shaft, a first driving gear, a first driven gear, an output shaft, an output gear and a differential, the second motor drives the third input shaft to rotate, and then the power sequentially transmitted to the second driving gear, the second driven gear, the output shaft, the output gear and the differential, so that the first motor and the second motor jointly drive the wheels to rotate;

Or the first clutch is closed, the second clutch is closed, the battery is discharged, and the inverter supplies power to the first motor and the second motor, and the first motor drives the second motor. An input shaft, the planet carrier and the sun gear rotate simultaneously, and then the power is sequentially transmitted to the second input shaft, the first driving gear, the first driven gear, the output shaft, the output gear and the The differential gear drives the third input shaft to rotate through the second motor, and then transmits the power to the second driving gear, the second driven gear, the output shaft, the output gear and The differential, so that the first motor and the second motor jointly drive the wheels to rotate.

Optionally, in the reversing mode,

The first motor does not work, the first clutch is disconnected, the second clutch is closed, the battery is discharged, the inverter supplies power to the second motor, the second motor reverses, and the second motor drives the third input shaft to rotate , and then the power is sequentially transmitted to the second driving gear, the second driven gear, the output shaft, the output gear and the differential, thereby driving the wheels to rotate and realizing reversing.

Optionally, in the energy recovery mode,

The first motor does not work, the first clutch is disconnected, the second clutch is closed, the second motor is controlled to turn on the power generation mode, and the wheels transmit power to the differential, the output gear, the output shaft, the second driven gear, and the second driving gear in sequence. The gear and the third input shaft transmit the kinetic energy to the second motor, and the second motor converts the kinetic energy into electrical energy, which is stored in the battery via the inverter.

In a fourth aspect, an embodiment of the present invention further provides a vehicle, including the above-mentioned vehicle hybrid powertrain.

The beneficial effects of the technical solutions provided by the embodiments of the present invention at least include:

The dual-motor drive system provided by the embodiment of the present invention has two power sources of the first motor and the second motor, and by applying it to automobile driving, it can realize single-motor drive mode, dual-motor drive mode, reversing mode and energy recovery Mode and other modes, by setting the planetary gear mechanism, the switch of five forward gears can be realized, and the distribution of power can be optimized according to different driving conditions, so as to reduce energy consumption and provide strong power at the same time.

In addition, in the stage of vehicle acceleration and low-speed driving, when the load of the vehicle system is low-to-medium load, the single-motor pure electric drive mode is used; in the medium-speed and high-speed stages, when the load of the vehicle system is high, the dual-motor drive mode is used . The above two modes take advantage of the characteristics of fast motor response, high torque at low speed and low torque at high speed to improve power efficiency. Among them, in the medium-speed and high-speed stages, the use of dual-motor drive uses the different speed ratios of the two gears to make the motor always work in the high-efficiency zone.

And by setting the one-way clutch, it can not only prevent the reverse rotation of the first motor, but also reduce the drag loss of the first motor to the second motor, and further reduce energy consumption. During the shifting process, through the cooperation of the two motors to adjust the speed, the ride comfort of the vehicle is also greatly improved, which further meets the user's requirements for driving comfort.

The motor drive system provided by the embodiment of the present application includes a planetary gear mechanism, the first clutch can adjust the output speed of the first motor through the planetary gear mechanism, has a larger speed adjustment range, improves transmission efficiency, and the overall structure of the gearbox is simple.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

FIG. 1 is a schematic structural diagram of a dual-motor drive system provided by an embodiment of the present application;

FIG. 2 is a schematic diagram of the first energy transfer of the dual-motor drive system in the single-motor drive mode provided by the embodiment of the present application;

3 is a schematic diagram of the second energy transfer of the dual-motor drive system in the single-motor drive mode provided by the embodiment of the present application;

4 is a schematic diagram of the third energy transfer of the dual-motor drive system in the single-motor drive mode provided by the embodiment of the present application;

Fig. 5 is a schematic diagram of the energy transfer of the medium gear in the dual-motor drive mode of the dual-motor drive system provided by the embodiment of the present application;

FIG. 6 is a schematic diagram of the energy transfer of the high-speed gear in the dual-motor drive mode of the dual-motor drive system provided by the embodiment of the present application;

FIG. 7 is a schematic diagram of energy transfer in the reverse mode of the dual-motor drive system provided by the embodiment of the present application;

Fig. 8 is a schematic diagram of the first energy transfer in the energy recovery mode of the dual-motor drive system provided by the embodiment of the present application;

Fig. 9 is a schematic diagram of the second energy transfer in the energy recovery mode of the dual-motor drive system provided by the embodiment of the present application;

Fig. 10 is a schematic diagram of a third energy transfer in the energy recovery mode of the dual-motor drive system provided by the embodiment of the present application.

The reference signs in the figure represent respectively:

1-first motor; 2-second motor; 3-first input shaft; 4-third input shaft; 5-second input shaft; 6-output shaft; 7-planetary row mechanism; 701-sun gear; 702 -Multiple planetary gears; 703-planet carrier; 704-ring gear; 8-first driving gear; 9-second driving gear; 10-first driven gear; 11-second driven gear; 12-output gear 13-first clutch; 1301-active part; 1302-driven part; 14-one-way clutch; 15-second clutch; ; 18-differential; 19-wheel; 20-wheel shaft; 100-speed change mechanism.

detailed description

Reference will now be made in detail to exemplary embodiments of which are illustrated in the accompanying drawings. When the following description refers to reference numerals, unless otherwise indicated, the same reference numerals in different embodiments refer to the same or similar elements.

The implementations described in the following exemplary examples do not represent all implementations consistent with the present invention. Rather, they are merely examples of structures consistent with aspects of the invention as recited in the appended claims.

The embodiment of the present invention provides a dual-motor drive system, its structure diagram is shown in Figure 1, the system includes: a first motor 1, a second motor 2, a first input shaft 3, a third input shaft 4, Input shaft 5 , output shaft 6 , planetary gear mechanism 7 , first driving gear 8 , second driving gear 9 and first clutch 13 .

The first input shaft 3 is connected with the first motor 1, the first clutch 13 and the planetary mechanism 7 are installed on the first input shaft 3, a part of the first clutch 13 is connected with the first input shaft 3, the other part of the first clutch 13 A part is connected with the planetary row mechanism 7. The first driving gear 8 is installed on the output end of the second input shaft 5 , and the input end of the second input shaft 5 is connected with the planetary gear mechanism 7 .

The third input shaft 4 is connected with the second motor 2 , and the second driving gear 9 is mounted on the third input shaft 4 .

The output shaft 6 is used to receive the power output by the first driving gear 8 and the second driving gear 9 .

The dual-motor drive system provided by the embodiment of the present invention can realize the switching of multiple forward gears by setting the planetary gear mechanism and the first clutch, optimize the distribution of power according to different driving conditions, and provide strong power while reducing energy consumption . In addition, during the gear shifting process, through the cooperation of the two motors, the ride comfort of the vehicle is also greatly improved, which better meets the user's requirements for driving comfort.

In some embodiments of the present application, referring to FIG. 1 , the motor drive system includes a planetary gear mechanism 7, a first motor 1, a first clutch 13, and a wheel shaft 20; the planetary gear mechanism 7 includes a sun gear 701, a ring gear 704, multiple A planetary gear 702, a planetary carrier 703, the first input shaft 3; the sun gear 701 and the ring gear 704 are concentrically arranged, and a plurality of planetary gears 702 are located between the sun gear 701 and the ring gear 704, and are connected to the sun gear 701 and the ring gear 704 meshing, the planet carrier 703 is connected with a plurality of planetary gears 702, the first input shaft 3 is coaxially connected with the sun gear 701; the first motor 1 is connected with the first input shaft 3; the first clutch 13 is connected with the first input shaft 3, It is used to connect or disconnect the planetary carrier 703 with the first input shaft 3 ; the wheel shaft 20 is in drive connection with the planetary carrier 703 .

In order to make the technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Optionally, as shown in FIG. 1 , the planetary gear mechanism 7 in this application includes a sun gear 701 , a plurality of planetary gears 702 , a planet carrier 703 and a ring gear 704 .

Each planetary gear 702 meshes with the outer circular gear of the sun gear 701 and the inner circular gear of the ring gear 704 respectively, and each planetary gear 702 of the plurality of planetary gears 702 is rotatably disposed on the planet carrier 703 .

A part of the first clutch 13 is connected with the first input shaft 3, and another part of the first clutch 13 is connected with the planet carrier 703, that is, the active part 1301 of the first clutch 13 is connected with the first input shaft 3, and the first clutch 13 The driven part 1302 is connected with the planet carrier 703 .

Exemplarily, the driving disc of the first clutch 13 is connected to the first input shaft 3 , the driven disc of the first clutch 13 is connected to the planet carrier 703 , or the driven disc of the first clutch 13 is connected to the first input shaft 3 , the driving disc of the first clutch 13 is connected with the planet carrier 703 .

The motor drive system may also include a one-way clutch 14 through which the ring gear 704 is connected with the vehicle body to prevent the first input shaft 3 from reversing.

In some embodiments of the present application, as shown in Figure 1, the motor drive system can also include a speed change mechanism 100, the speed change mechanism 100 includes a second input shaft 5, an output shaft 6 and a speed change gear set, the second input shaft 5 and the output shaft The shaft 6 is in transmission connection through the transmission gear set, the second input shaft 5 is connected with the planet carrier 703 , and the output shaft 6 is in transmission connection with the wheel shaft 20 . Wherein, the transmission gear set may include a first input gear 8 and a first output gear 10 , the first input gear 8 is coaxially connected with the second input shaft 5 , and the first output gear 10 is coaxially connected with the output shaft 6 .

In some embodiments of the present application, referring to FIG. 1 , the speed change mechanism 100 may also include a third input shaft 4, the third input shaft 4 and the output shaft 6 are connected through a transmission gear set, and the motor drive system further includes a second motor 2 , the second motor 2 is connected to the third input shaft 4 .

The planet carrier 703 is connected to the second input shaft 5 .

Those skilled in the art can understand that, when the first clutch 13 is disconnected, when the power is reversely transmitted to the second input shaft 5, the one-way clutch 14 will be automatically disconnected, and the second input shaft 5 drives the planet carrier 703 to rotate , since the ring gear 704 is also in the free rotation state, the rotation direction of the sun gear 701 is still the rotation direction of the power output of the motor 1; when the first clutch 13 is closed, when the power is reversely transmitted to the second input shaft 5, the single The clutch 14 will be automatically closed and the ring gear 704 will be in a locked state. At this time, the first input shaft 1, the sun gear 701, the planet carrier 703 and the first input shaft 3 will not rotate because of the locked state of the ring gear 704. Thereby preventing the first input shaft 3 from reversing.

Optionally, as shown in FIG. 1 , the dual-motor drive system further includes a second clutch 15 .

The second clutch 15 is installed on the third input shaft 4 , and the second motor 2 is connected with the third input shaft 4 through the second clutch 15 .

Those skilled in the art can understand that, by closing or disengaging the second clutch 15 , the control of the connection or disengagement of the second motor 2 can be realized.

Optionally, as shown in FIG. 1 , the dual-motor drive system further includes a first driven gear 10 , a second driven gear 11 , an output gear 12 and a differential 18 . The output shaft 6 is in transmission connection with the differential 18 through the output gear 12 , and the differential 18 is connected with the wheel shaft 20 . The transmission gear set may also include a second input gear 9 and a second output gear 11 , the second input gear 9 is coaxially connected to the third input shaft 4 , and the second output gear 11 is coaxially connected to the output shaft 6 .

The first driven gear 10 , the second driven gear 11 and the output gear 12 are installed on the output shaft 6 .

The first driven gear 10 meshes with the first driving gear 8 to receive the power output by the first driving gear 8 .

The second driven gear 11 meshes with the second driving gear 9 to receive the power output by the second driving gear 9 .

The output gear 12 is connected to a differential 18 for transmitting power to the wheels 19 .

The differential 18 is used to make the left and right (or front and rear) drive wheels of the vehicle rotate at different speeds.

Optionally, as shown in FIG. 1 , the dual-motor drive system further includes an inverter 16 and a battery 17 .

One end of the inverter 16 is electrically connected to the battery 17 , and the other end is electrically connected to the first motor 1 and the second motor 2 connected in parallel.

At the same time, the inverter 16 is not only used to convert the direct current output by the battery 17 into a three-phase alternating current to drive the main shafts of the first motor 1 and the second motor 2, but also to provide the first motor 1 and the second motor 2 with The alternating current is converted into direct current and stored in the battery 17.

An embodiment of the present application also provides a vehicle, which includes the vehicle hybrid system described above.

The dual-motor drive system provided by the embodiment of the present invention is applied to the drive of a vehicle, and can realize a single-motor drive mode, a dual-motor drive mode, a reverse mode and an energy recovery mode.

In the single-motor driving mode, only one of the first motor 1 and the second motor 2 works, so that a single motor provides power to drive the wheel 19 to rotate.

Exemplarily, as shown in FIG. 2, only the second motor 2 works, the first motor 1 does not work, the first clutch 13 is disconnected, the second clutch 15 is closed, and the one-way clutch 14 is used to prevent the sun gear from reversing. That is to prevent the first motor 1 from reversing, cut off the power transmission between the first motor 1 and the wheels 19, and supply power to the second motor 2 by the battery 17, so that the second motor 2 drives the wheels 19 to rotate.

Specifically, the battery 17 is discharged, and the inverter 16 converts the DC power into a three-phase AC power to drive the second motor 2 to rotate the main shaft, and the second motor 2 converts electrical energy into mechanical energy through the third input shaft 4 and the second driving gear. 9. The second driven gear 11 , the output shaft 6 , the output gear 12 and the differential gear 18 , so that the second motor 2 alone provides power to drive the wheels 19 to rotate.

Exemplarily, as shown in FIG. 3 , only the first motor 1 works, the second motor 2 does not work, the second clutch 15 is disconnected, so that the second motor 2 does not provide power, the first clutch 13 is closed, and the sun gear 701 and The planetary carrier 703 rotates together in the forward direction, and the ring gear 704 also rotates in the forward direction, and the one-way clutch 14 is disconnected accordingly, and the battery 17 supplies power to the first motor 1 , so that the first motor 1 drives the wheels 19 to rotate.

Specifically, the battery 17 is discharged, and the inverter 16 converts the DC power into a three-phase AC power to drive the main shaft of the first motor 1 to rotate. The first motor 1 converts electrical energy into mechanical energy through the first input shaft 3, the planet carrier 703, The second input shaft 5 , the first driving gear 8 , the first driven gear 10 , the output shaft 6 , the output gear 12 and the differential gear 18 realize that the first motor 1 alone provides power to drive the wheels 19 to rotate.

Exemplarily, as shown in Figure 4, only the first motor 1 works, the second motor 2 does not work, the second clutch 15 is disconnected, so that the second motor 2 does not provide power, the first clutch 13 is disconnected, and the sun gear 701 And the planetary carrier 703 rotates forward, and the planetary gear 702 reverses. At this time, the ring gear 704 is locked by the one-way clutch and cannot be reversed. The battery 17 supplies power to the first motor 1, so that the first motor 1 drives the wheels 19 to rotate.

Specifically, the battery 17 is discharged, the inverter 16 converts the DC power into a three-phase AC power, and then drives the first motor 1 to rotate the main shaft, and the first motor 1 converts electrical energy into mechanical energy through the first input shaft 3, the sun gear 701, A plurality of planetary gears 702, a planetary carrier 703, a second input shaft 5, a first driving gear 8, a first driven gear 10, an output shaft 6, an output gear 12 and a differential 18, so that the first motor 1 is provided separately Power drives the wheel 19 to rotate.

In the dual-motor drive mode, the first motor 1 and the second motor 2 provide power at the same time, and are divided into two gears during the driving process, one gear is a medium-speed gear, and the other gear is a high-speed gear. The bit can be switched according to the actual working conditions, so that the two motors always work in the high-efficiency area.

Exemplarily, as shown in FIG. 5 , in the middle gear, the first clutch 13 is disconnected, the second clutch 15 is closed, and the battery 17 supplies power to the first motor 1 and the second motor 2 at the same time, so that the first motor 1 and the second motor 2 The second motor 2 jointly drives the wheels 19 to rotate.

Specifically, the battery 17 is discharged, and the inverter 16 converts the direct current into a three-phase alternating current, and simultaneously drives the main shafts of the first motor 1 and the second motor 2 to rotate, and the first motor 1 drives the first input shaft 3 to rotate, and then the The power is sequentially transmitted to the sun gear 701, a plurality of planetary gears 702, the planet carrier 703, the second input shaft 5, the first driving gear 8, the first driven gear 10, the output shaft 6, the output gear 12 and the differential 18, The second motor 2 drives the third input shaft 4 to rotate, and then transmits the power to the second driving gear 9, the second driven gear 11, the output shaft 6, the output gear 12 and the differential 18 in sequence, thereby realizing the first motor 1 and the second motor 2 jointly provide power to drive the wheels 19 to rotate.

Exemplarily, as shown in Figure 6, in the high gear, the first clutch 13 is closed, the second clutch 15 is closed, and the battery 17 supplies power to the first motor 1 and the second motor 2 at the same time, so that the first motor 1 and the second motor 1 The motors 2 jointly drive the wheels 19 to rotate.

Specifically, the battery 17 is discharged, and the inverter 16 converts the direct current into a three-phase alternating current, and simultaneously drives the main shafts of the first motor 1 and the second motor 2 to rotate, and the first motor 1 drives the first input shaft 3 and the planet carrier 703 It rotates with the sun gear 701 at the same time, and then transmits the power to the second input shaft 5, the first driving gear 8, the first driven gear 10, the output shaft 6, the output gear 12 and the differential 18 in sequence, and the second motor 2 Drive the third input shaft 4 to rotate, and then transmit the power to the second driving gear 9, the second driven gear 11, the output shaft 6, the output gear 12 and the differential 18 in sequence, thereby realizing the first motor 1 and the second motor 2 jointly provide power to drive the wheel 19 to rotate.

In the reversing mode, the first motor 1 does not work, the second motor 2 provides power and the main shaft of the second motor 2 reverses, and the reversed power is transmitted to the wheels, thereby realizing the reverse.

Exemplarily, as shown in FIG. 7 , the first clutch 13 is disconnected, the second clutch 15 is closed, and the battery 17 supplies power to the second motor 2 , so that the second motor 2 drives the wheels 19 to reverse.

Specifically, the battery 17 is discharged, the inverter 16 converts the direct current into a three-phase alternating current, and then drives the main shaft of the second motor 2 to reverse, and the second motor 2 converts electrical energy into mechanical energy through the third input shaft 4, the second The driving gear 9, the second driven gear 11, the output shaft 6, the output gear 12 and the differential gear 18 are powered by the second motor 2 to drive the wheels 19 to reverse to realize reversing.

In the energy recovery mode, at least one of the first motor 1 and the second motor 2 converts the mechanical energy generated during braking/sliding in the single-motor drive mode or dual-motor drive mode or reverse mode into electrical energy, and then stores Put it into the battery 17 for standby use.

Exemplarily, under braking or coasting conditions, the energy in the single-motor drive mode is recovered. Taking the single-motor drive mode with the second motor 2 as the power source as an example, as shown in FIG. 8 , the first motor 1 does not work , the first clutch 13 is disconnected, the second clutch 15 is closed, the second motor 2 is controlled to start the power generation mode, and the wheels 19 transmit power to the differential 18, the output gear 12, the output shaft 6, the second driven gear 11, The second driving gear 9 and the third input shaft 4 transmit the mechanical energy to the second motor 2, and the second motor 2 converts the mechanical energy into electrical energy, which is stored in the battery 17 via the inverter 16, thereby realizing the single-motor drive mode recovery of braking/coasting energy.

The above only describes the energy flow transfer when the vehicle is in the single-motor drive mode and uses the second motor 2 as the power source, and the energy recovery in the other two single-motor drive modes with the first motor 1 as the power source can be obtained by analogy.

Exemplarily, under braking or coasting conditions, the energy in the dual-motor drive mode is recovered, taking the medium-speed gear mode in the dual-motor drive mode as an example, as shown in FIG. 9, the first clutch 13 is disconnected, and the second The second clutch 15 is closed, the first motor 1 and the second motor 2 are controlled to be in the power generation mode, and the wheels 19 transmit power through the differential 18, the output gear 12, the output shaft 6, the first driven gear 10, and the first driving gear 8 , the second input shaft 5, the planet carrier 703, a plurality of planetary gears 702, the sun gear 701 and the first input shaft 3 are transmitted to the first motor 1, and power is transmitted to the first motor 1 through the differential 18, the output gear 12, the output shaft 6, The second driven gear 11, the second driving gear 9 and the third input shaft 4 are transmitted to the second motor 2, and the first motor 1 and the second motor 2 respectively convert mechanical energy into electrical energy, which is stored in the battery 17 via the inverter 16 In order to realize the recovery of braking/coasting energy in the dual-motor driving mode.

The above only describes the energy flow transfer when the vehicle is in the middle gear in the dual-motor drive mode. In addition, the energy recovery in the high-speed gear in the dual-motor drive mode can be obtained by analogy.

Exemplarily, under braking or coasting conditions, the energy in the reversing mode is recovered as shown in FIG. The power is transmitted to the differential 18, the output gear 12, the output shaft 6, the second driven gear 11, the second driving gear 9 and the third input shaft 4 in sequence, and then the mechanical energy is transmitted to the second motor 2, and the second motor 2 The mechanical energy is converted into electrical energy, which is stored in the battery 17 via the inverter 16, so as to realize the recovery of braking/sliding energy in the reverse mode.

It should be noted that the "first driving gear" mentioned above is equivalent to the first input gear, the "first driven gear" is equivalent to the first output gear, the "second driving gear" is equivalent to the second input gear, and the "second driven gear" is equivalent to the second input gear. The driven gear" is equivalent to the second output gear. A part of the clutch involved in this application refers to the driving part of the clutch, and another part of the clutch involved refers to the driven part of the clutch.

The dual-motor drive system provided by the embodiment of the present application has two power sources of the first motor and the second motor, and by applying it to automobile driving, single-motor drive mode, dual-motor drive mode, reversing mode and energy recovery can be realized Mode and other modes, in the stage of vehicle acceleration and low-speed driving, when the load of the vehicle system is low to medium load, use the single-motor pure electric drive mode; in the stage of medium speed and high speed, when the load of the vehicle system is high load, use Dual motor drive mode. The above two modes take advantage of the characteristics of fast motor response, high torque at low speed and low torque at high speed to improve power efficiency. Among them, in the medium-speed and high-speed stages, the use of dual-motor drive uses the different speed ratios of the two gears to make the motor always work in the high-efficiency zone. At the same time, the energy recovery mode can recover the mechanical energy generated by the vehicle during braking/sliding to improve energy utilization.

In the present invention, the terms "first", "second" and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance. The term "plurality" means two or more, unless otherwise clearly defined.

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be assumed that the specific embodiments of the present invention are limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, other implementations obtained without departing from the technical solutions of the present invention shall be included in the protection scope of the present invention.

Claims

A motor drive system, comprising: a planetary gear mechanism (7), a first motor (1), a first clutch (13) and a wheel shaft (20);

The planetary row mechanism (7) includes a sun gear (701), a ring gear (704), a plurality of planetary gears (702), a planet carrier (703), and a first input shaft (3);

The sun gear (701) and the ring gear (704) are concentrically arranged, and a plurality of planetary gears (702) are located between the sun gear (701) and the ring gear (704), and are connected to the The sun gear (701) meshes with the ring gear (704), the planet carrier (703) is connected with multiple planet gears (702), and the first input shaft (3) is connected with the sun gear (701 ) are coaxially connected;

The first motor (1) is connected to the first input shaft (3);

The first clutch (13) is connected with the first input shaft (3), and is used for connecting or disconnecting the planet carrier (703) with the first input shaft (3);

The wheel shaft (20) is in transmission connection with the planet carrier (703).
The motor drive system according to claim 1, wherein, the driving part (1301) of the first clutch (13) is connected with the first input shaft (3), and the driven part (1301) of the first clutch (13) A portion (1302) is connected to said planet carrier (703).
The motor drive system according to claim 2, wherein the motor drive system further comprises a speed change mechanism (100), and the speed change mechanism (100) includes a second input shaft (5), an output shaft (6) and a speed change gear group, the second input shaft (5) and the output shaft (6) are connected through the transmission gear set;

The second input shaft (5) is connected to the planet carrier (703), and the output shaft (6) is connected to the wheel shaft (20) in transmission.
The motor drive system according to claim 3, wherein the transmission gear set includes a first input gear and a first output gear, the first input gear is coaxially connected with the second input shaft (5), and the The first output gear is coaxially connected with the output shaft (6).
The motor drive system according to claim 4, wherein the transmission mechanism (100) further comprises a third input shaft (4), and the third input shaft (4) and the output shaft (6) pass through the Speed change gear set transmission connection;

The motor drive system also includes a second motor (2), and the second motor (2) is connected to the third input shaft (4).
The motor drive system according to claim 5, wherein the speed change gear set further comprises a second input gear and a second output gear, the second input gear and the third input shaft (4) are coaxially connected, The second output gear is coaxially connected with the output shaft (6).
The motor drive system according to claim 5, wherein the motor drive system further comprises a second clutch (15);

The second motor (2) is connected to the third input shaft (4) through the second clutch (15).
The motor drive system according to any one of claims 1 to 6, wherein the motor drive system further comprises a differential (18) and an output gear;

The output shaft (6) is in transmission connection with the differential (18) through the output gear, and the differential (18) is connected with the wheel shaft (20).
The motor drive system according to claim 1, wherein the motor drive system further comprises a one-way clutch (14), and the ring gear (704) is connected to the vehicle body through the one-way clutch (14).
The motor drive system according to any one of claims 1 to 9, wherein the motor drive system further comprises an inverter (16) and a battery (17);

The battery (17) is electrically connected to the first motor (1) and the second motor (2) through the inverter (16).
A vehicle comprising the vehicle hybrid powertrain according to any one of claims 1-10.