阅读说明：本技术 变速装置、电力驱动系统及新能源汽车 (Speed change device, electric drive system and new energy automobile ) 是由 唐正义 郭海 王欢 于 2021-08-12 设计创作，主要内容包括：本申请涉及一种变速装置、电力驱动系统及新能源汽车。变速装置包括一级传动单元、二级传动单元、中间轴、中间轴齿轮、第一离合单元、第二离合单元、第三离合单元；所述中间轴齿轮固定地套设于所述中间轴上；第一离合单元设于所述中间轴与所述一级传动单元之间；第二离合单元设于中间轴与二级传动单元之间；第三离合单元设于一级传动单元与所述中间轴齿轮之间；在第一离合单元结合中间轴与一级传动单元之间的动力传递,第二离合单元结合中间轴与二级传动单元之间的动力传递,及第三离合单元结合中间轴齿轮与一级传动单元之间的动力传递时,变速装置处于自锁状态。(The application relates to a speed changing device, an electric drive system and a new energy automobile. The speed change device comprises a primary transmission unit, a secondary transmission unit, an intermediate shaft gear, a first clutch unit, a second clutch unit and a third clutch unit; the intermediate shaft gear is fixedly sleeved on the intermediate shaft; the first clutch unit is arranged between the intermediate shaft and the primary transmission unit; the second clutch unit is arranged between the intermediate shaft and the secondary transmission unit; the third clutch unit is arranged between the primary transmission unit and the intermediate shaft gear; when the first clutch unit is combined with power transmission between the intermediate shaft and the primary transmission unit, the second clutch unit is combined with power transmission between the intermediate shaft and the secondary transmission unit, and the third clutch unit is combined with power transmission between the intermediate shaft gear and the primary transmission unit, the speed change device is in a self-locking state.)

1. A speed change device is characterized by comprising a primary transmission unit, a secondary transmission unit, an intermediate shaft gear, a first clutch unit, a second clutch unit and a third clutch unit; the intermediate shaft gear is fixedly sleeved on the intermediate shaft; the first clutch unit is arranged between the intermediate shaft and the primary transmission unit and is used for combining or disconnecting power transmission between the primary transmission unit and the intermediate shaft; the second clutch unit is arranged between the intermediate shaft and the secondary transmission unit and is used for combining or disconnecting power transmission between the secondary transmission unit and the intermediate shaft; the third clutch unit is arranged between the primary transmission unit and the intermediate shaft gear and is used for combining or disconnecting power transmission between the primary transmission unit and the intermediate shaft gear;

when the first clutch unit is combined with power transmission between the intermediate shaft and the primary transmission unit, the second clutch unit is combined with power transmission between the intermediate shaft and the secondary transmission unit, and the third clutch unit is combined with power transmission between the intermediate shaft gear and the primary transmission unit, the speed change device is in a self-locking state.

2. The transmission of claim 1, wherein the transmission is in a non-self-locking state when the first clutch unit engages power transfer between the countershaft and the primary drive unit, the second clutch unit engages power transfer between the countershaft and the secondary drive unit, and the third clutch unit disengages power transfer between the countershaft gear and the primary drive unit.

3. The transmission according to claim 1 or 2, wherein the third clutch unit includes a third clutch provided between the counter gear and the primary transmission unit, an actuator connected to the actuator, and an actuator connector for controlling the actuator connector to engage or disengage the third clutch with or from the power transmission between the counter gear and the primary transmission unit.

4. The transmission according to claim 1 or 2, wherein the primary transmission unit includes a primary transmission input gear and a primary transmission output gear, the primary transmission output gear is engaged with the primary transmission input gear, the first clutch unit is installed between the primary transmission output gear and the intermediate shaft, and the third clutch is installed between the primary transmission output gear and the intermediate gear.

5. The transmission of claim 4, wherein the first clutch unit includes a one-way clutch mounted between the primary drive output gear and the countershaft.

6. The transmission of claim 3, wherein the third clutch is a dog clutch and the actuator is configured to control axial movement of the actuator linkage along the countershaft to engage the third clutch with the countershaft gear to couple power transfer between the countershaft gear and the primary drive unit or disengage the third clutch from the countershaft gear to decouple power transfer between the countershaft gear and the primary drive unit.

7. The transmission according to claim 1 or 2, wherein the secondary transmission unit includes a secondary transmission input gear and a secondary transmission output gear, the secondary transmission output gear is engaged with the secondary transmission input gear, and the second clutch unit is interposed between the secondary transmission output gear and the intermediate shaft.

8. The transmission device according to claim 7, characterized in that the second clutch unit includes a friction plate clutch or an electromagnetic clutch.

9. The transmission arrangement according to any of claims 1-8, further comprising a differential unit, which is in driving connection with the intermediate shaft.

10. The transmission of claim 9, wherein the differential unit includes a final drive input gear, a final drive output gear, and a differential, the final drive input gear being disposed about and rotatable with the countershaft, the final drive output gear being in meshing engagement with the final drive input gear, the differential being in driving connection with the final drive output gear.

11. The transmission arrangement according to any one of claims 1-10, characterised in that the gear ratio of the third clutch unit in combination with the countershaft gearing is different from the gear ratio of the second clutch unit in combination with the countershaft.

12. An electric drive system comprising a drive motor and a transmission according to any one of claims 1 to 11, wherein the drive motor comprises a drive body and an input shaft, the drive body is configured to drive the input shaft to rotate, the input shaft is in transmission connection with the primary transmission unit, and the input shaft is in transmission connection with the secondary transmission unit.

13. The new energy automobile is characterized by comprising a vehicle control unit, the electric drive system and the electronic parking brake system, wherein the electric drive system comprises an automatic speed change control module and wheels, the intermediate shaft is in transmission connection with the wheels, the vehicle control unit is in communication connection with the automatic speed change control module, the vehicle control unit is in communication connection with the electronic parking brake control module, and the vehicle control unit is used for sending a parking signal to the automatic speed change control module to enable the speed change device to enter a self-locking state and controlling the electronic parking brake system to apply brake force to the wheels.

Technical Field

The application relates to the technical field of new energy vehicles, in particular to a speed change device, an electric drive system and a new energy vehicle.

Background

A brake system of an automobile is a system that applies a certain braking force to wheels of the automobile to forcibly brake the wheels to some extent. The braking system is used for forcibly decelerating or even stopping a running automobile according to the requirements of a driver or a controller, or stably parking the stopped automobile under various road conditions (for example, on a slope), or keeping the speed of the automobile running on a downhill stable.

Compare in traditional mechanical type manual brake, Electronic Parking Brake (EPB) system can control the DC motor who loads the parking brake device on wheel limit, realizes the clamp of wheel and releases, can provide suitable braking force for the vehicle according to the road conditions of difference simultaneously, realizes the electron parking of vehicle. On the vehicle carrying the EPB system, a user can brake the vehicle through simple switch operation (an electronic hand brake button), the braking effect cannot be changed due to the force of the user, the vehicle can be braked during driving through the EPB system, a certain braking force is provided under emergency conditions, and accidents are avoided.

The new energy automobile on the market at present adopts single accuse EPB or two accuse EPB more, and single accuse EBP does not set up redundant design, has certain safe risk, and two accuse EPB adopt two controllers respectively independent control a parking module, and the space that occupies is great, is unfavorable for new energy automobile's lightweight development.

Disclosure of Invention

The embodiment of the application provides a speed changing device, an electric drive system and a new energy automobile which can reduce occupied space.

In a first aspect, the present application provides a transmission comprising a primary transmission unit, a secondary transmission unit, an intermediate shaft gear, a first clutch unit, a second clutch unit, and a third clutch unit; the intermediate shaft gear is fixedly sleeved on the intermediate shaft; the first clutch unit is arranged between the intermediate shaft and the primary transmission unit and can be used for combining or disconnecting power transmission between the primary transmission unit and the intermediate shaft; the second clutch unit is arranged between the intermediate shaft and the secondary transmission unit and is used for combining or disconnecting power transmission between the secondary transmission unit and the intermediate shaft; the third clutch unit is arranged between the primary transmission unit and the intermediate shaft gear and is used for combining or disconnecting power transmission between the primary transmission unit and the intermediate shaft gear; the transmission is in a self-locking state when the first clutch unit is combined with power transmission between the intermediate shaft and the primary transmission unit, the second clutch unit is combined with power transmission between the intermediate shaft and the secondary transmission unit, and the third clutch unit is combined with power transmission between the intermediate shaft gear and the primary transmission unit.

The term "engaged" means that power (e.g., torque) can be transmitted between "a" and "B", and the term "disengaged" means that power cannot be transmitted between "a" and "B", for example, the first clutch unit couples the power transmission between the primary transmission unit and the countershaft to enable power transmission between the primary transmission unit and the countershaft, and the first clutch unit disengages the power transmission between the primary transmission unit and the countershaft to disable power transmission between the primary transmission unit and the countershaft.

The first clutch unit is combined with power transmission between the intermediate shaft and the primary transmission unit, the second clutch unit is combined with power transmission between the intermediate shaft and the secondary transmission unit, and the third clutch unit is combined with power transmission between the intermediate shaft gear and the primary transmission unit, so that self-locking of the speed change device can be realized, and the intermediate shaft cannot rotate. For example, a transmission ratio of the third clutch unit when combined with the countershaft gear may be set to be different from a transmission ratio of the second clutch unit when combined with the countershaft so that the countershaft cannot rotate when the first clutch unit is combined with power transmission between the countershaft and the primary transmission unit, the second clutch unit is combined with power transmission between the countershaft and the secondary transmission unit, and the third clutch unit is combined with power transmission between the countershaft gear and the primary transmission unit, thereby realizing self-locking of the transmission. In other words, when the speed changing device needs to be self-locked, the speed changing device can be realized only by engaging the gears of the second clutch unit and the third clutch unit, and the operation is simple and quick.

When the speed change device is applied to a new energy automobile, an intermediate shaft of the speed change device is in transmission connection with wheels, and the speed change device can transmit power of a driving motor to the wheels to enable the wheels to rotate. When the new energy automobile with the speed change device needs parking braking, the speed change device is enabled to enter a self-locking state, the intermediate shaft cannot rotate, the wheels can be prevented from rotating, and further the possibility of wheel rotation is reduced. Because an additional parking mechanism is not needed to be added, the speed change device of the electric drive system and the electronic parking brake system of the new energy automobile form the electronic parking brake redundant system, the safety of the new energy automobile is improved, meanwhile, the occupied volume of the electronic parking brake redundant system can be reduced, and the lightweight development of the new energy automobile is facilitated.

According to a first aspect, in a first possible implementation manner of the first aspect of the present application, when the first clutch unit is engaged with power transmission between the intermediate shaft and the primary transmission unit, the second clutch unit is engaged with power transmission between the intermediate shaft and the secondary transmission unit, and the third clutch unit is disengaged from power transmission between the intermediate shaft gear and the primary transmission unit, the transmission device is in a non-self-locking state. The transmission is in a non-self-locking state, that is, the intermediate shaft can rotate, and the transmission can transmit power, for example, the power of the driving motor is transmitted to the wheels, so that the wheels rotate. For example, when the speed change device is in a non-self-locking state, the third clutch unit is disengaged from the intermediate shaft gear, the third clutch unit does not interfere with the movement of the intermediate shaft, and the speed change device can perform normal speed change transmission.

According to the first aspect or the first possible implementation manner of the first aspect of the present application, in a second possible implementation manner of the first aspect of the present application, the third clutch unit includes a third clutch, an actuator, and an actuator connecting piece, the third clutch is disposed between the countershaft gear and the primary transmission unit, the actuator connecting piece is connected to the actuator, and the actuator is configured to control the actuator connecting piece to enable the third clutch to engage or disengage power transmission between the countershaft gear and the primary transmission unit.

The third clutch unit can be engaged through controlling the execution connecting piece to move along the axial direction of the intermediate shaft, and the operation is simple, convenient and quick.

According to the first aspect or the first to the second possible implementation manners of the first aspect of the present application, in a third possible implementation manner of the first aspect of the present application, the primary transmission unit includes a primary transmission input gear and a primary transmission output gear, the primary transmission output gear is engaged with the primary transmission input gear, the first clutch unit is installed between the primary transmission output gear and the intermediate shaft, and the third clutch is installed between the primary transmission output gear and the intermediate gear.

The primary transmission unit comprises a primary transmission input gear and a primary transmission output gear, so that the flexibility of the layout of internal parts of the speed change device is improved, and the occupied space of the speed change device is reduced.

In a fourth possible implementation form of the first aspect of the present application, according to the first aspect or the first to third possible implementation forms of the first aspect of the present application, the first clutch unit includes a one-way clutch, and the one-way clutch is installed between the primary transmission output gear and the intermediate shaft.

The first clutch unit is a one-way clutch which can combine power transmission between the intermediate shaft and the primary transmission unit when rotating in one direction of rotation, and can disconnect power transmission between the intermediate shaft and the primary transmission unit when rotating in the other direction of rotation. The one-way clutch does not need an additional operating mechanism, so that the structure of the speed change device is simplified, and the occupied space of the speed change device is reduced.

According to the first aspect or the first to fourth possible implementation manners of the first aspect of the present application, in a fifth possible implementation manner of the first aspect of the present application, the third clutch is a dog clutch, and the actuator is configured to control the actuating connecting member to move axially along the intermediate shaft, so that the third clutch engages with the intermediate shaft gear to realize combining of power transmission between the intermediate shaft gear and the primary transmission unit, or the third clutch disengages from the intermediate shaft gear to realize disconnection of power transmission between the intermediate shaft gear and the primary transmission unit.

The third clutch is a dog clutch, and can realize gear shifting by executing the axial movement of the connecting piece along the intermediate shaft, thereby being beneficial to the compactness and the light weight of the speed change device.

According to the first aspect or the first to fifth possible implementation manners of the first aspect of the present application, in a sixth possible implementation manner of the first aspect of the present application, the secondary transmission unit includes a secondary transmission input gear and a secondary transmission output gear, the secondary transmission output gear is engaged with the secondary transmission input gear, and the second clutch unit is installed between the secondary transmission output gear and the intermediate shaft.

The secondary transmission unit comprises a secondary transmission input gear and a secondary transmission output gear, so that the flexibility of the layout of internal parts of the speed change device is improved, and the occupied space of the speed change device is reduced.

According to the first aspect or the first to fifth possible implementation manners of the first aspect of the present application, in a sixth possible implementation manner of the first aspect of the present application, the second clutch unit includes a friction plate clutch or an electromagnetic clutch.

In a seventh possible implementation form of the first aspect of the present application, the transmission device further comprises a differential unit, wherein the differential unit is in transmission connection with the intermediate shaft. The differential unit is used for being connected with wheels. The differential gear unit is used for adjusting the rotation speed difference of each wheel.

According to the first aspect or the first to seventh possible implementation manners of the first aspect of the present application, in an eighth possible implementation manner of the first aspect of the present application, the differential unit includes a main reduction input gear, a main reduction output gear, and a differential, the main reduction input gear is sleeved on the intermediate shaft and can rotate along with the intermediate shaft, the main reduction output gear is engaged with the main reduction input gear, and the differential is in transmission connection with the main reduction output gear, so that flexibility of layout of internal components of the transmission device is improved, and an occupied space of the transmission device is reduced.

In a ninth possible implementation form of the first aspect of the present application, according to the first aspect or the first to eighth possible implementation forms of the first aspect of the present application, a gear ratio of the third clutch unit when combined with the countershaft gear is different from a gear ratio of the second clutch unit when combined with the countershaft.

In a second aspect, the present application provides an electric drive system, which includes a driving motor, and the transmission device according to the first aspect of the present application or the first to ninth possible implementations of the first aspect, where the driving motor includes a driving body and an input shaft, the driving body is used to drive the input shaft to rotate, the input shaft is in transmission connection with the primary transmission unit, and the input shaft is in transmission connection with the secondary transmission unit.

The speed change device can be self-locked, and the safety and reliability of the new energy automobile with the electric drive system during parking braking can be further improved.

In a third aspect, the application provides a new energy automobile, which comprises a vehicle control unit, an electric drive system and an electronic parking brake system, wherein the electric drive system and the electronic parking brake system are provided according to the second aspect, the electric drive system further comprises an automatic speed change control module and wheels, an intermediate shaft is in transmission connection with the wheels through a differential mechanism unit, the vehicle control unit is in communication connection with the automatic speed change control module, the vehicle control unit is in communication connection with the electronic parking brake control module, and is used for sending a parking signal to the automatic speed change control module to enable a speed change device to enter a self-locking state and controlling the electronic parking brake system to apply brake force to the wheels.

Because an additional parking mechanism or a control module is not required to be additionally added, the speed changing device of the electric drive system and the electronic parking brake system of the new energy automobile form the electronic parking brake redundant system, the safety of the new energy automobile is improved, meanwhile, the occupied volume of the electronic parking brake redundant system can be reduced, and the light weight development of the new energy automobile is facilitated.

In addition, the speed changing device and the electronic parking braking system are independently controlled, and the control accuracy of the new energy automobile is improved.

According to a third aspect, in a first possible implementation manner of the third aspect of the present application, the electronic parking brake system includes a parking module and an electronic parking brake control module, where the parking module includes a parking driving unit and a parking brake executing unit, the parking driving unit is configured to drive the parking brake executing unit to apply a braking force to the wheel, and the parking driving unit of the parking module is communicatively connected to the electronic parking brake control module.

According to the third aspect or the first possible implementation manner of the third aspect of the present application, the number of the electronic parking brake control modules is at least one, the number of the parking modules is at least one, and each of the parking modules is correspondingly connected to one electronic parking brake control module in a communication manner, so as to improve the control accuracy and the control efficiency.

In a third aspect or a first possible implementation manner of the third aspect of the present application, the number of the parking modules is two, the number of the electronic parking brake control modules is one, and the parking driving units in the two parking modules are both connected to the electronic parking brake control modules in a communication manner. Because two parking modules share one electronic parking brake control module, the occupied space of the new energy automobile is reduced, and the cost is reduced.

Drawings

Fig. 1 is a schematic view of a new energy vehicle provided in a first embodiment of the present application;

fig. 2 is a block diagram of a new energy vehicle according to a first embodiment of the present application;

fig. 3 is a schematic connection diagram of a transmission and a driving motor according to a first embodiment of the present application;

fig. 4 is a block diagram of a new energy vehicle according to a second embodiment of the present application.

Detailed Description

An electronic parking brake system of a new energy automobile comprises a first brake controller, a first parking module controlled by the first brake controller, a second brake controller and a second parking module controlled by the second brake controller. The first brake controller and the second brake controller are control function units which respectively and independently complete a parking control function. However, because two brake controllers are adopted for control, the occupied space is large, and the light weight development of the new energy automobile is not facilitated.

Based on this, please refer to fig. 1 and fig. 2, a new energy vehicle 1000 is provided in a first embodiment of the present application. The new energy automobile provides power for the vehicle through the motor drive system, and compared with the combination of an engine and a speed change device of a traditional fuel vehicle, the pure electric drive has the greatest advantage of flexible arrangement of the motor. The driving scheme of a single driving motor can be adopted, the driving scheme of a plurality of driving motors can be adopted, and even the driving scheme of a distributed wheel hub motor (wheel edge motor) can be adopted. Through flexible combination, the whole vehicle space is released to the greatest extent on the premise of ensuring the economy and the dynamic property of the whole vehicle.

The new energy vehicle 1000 includes a power supply system 101, an electric drive system 102, an electronic parking brake system (EPB) 103, and a Vehicle Control Unit (VCU) 107. It is understood that the new energy vehicle 1000 may further include other necessary or unnecessary structures, components, and the like, for example, an auxiliary system and the like, which are not described herein in detail.

The power supply system 101 includes a battery power supply, an energy management system, a charging controller, and the like, for supplying electric power.

The electric drive system 102 is used to efficiently convert the electric energy stored in the battery power supply of the power supply system 101 into the kinetic energy of the new energy automobile 1000. The electric drive system 102 includes a drive motor 1021, a transmission 1023, wheels 1025, and an automatic transmission control module 1027. The driving motor 1021 is in transmission connection with the wheels 1025 through the speed changing device 1023. An automatic Transmission Control Unit (TCU) 1027 is used to control the transmission 1023. The automatic transmission control module 1027 can realize that the transmission 1023 changes the values and directions of the torque and the rotating speed, and realize the change of the transmission ratio of the transmission 1023, namely, realize the gear shift so as to realize the speed change and torque change. The transmission 1023 includes a self-locking state and a non-self-locking state. When transmission 1023 is in a self-locking state, transmission 1023 cannot transmit the power of drive motor 1021 to wheels 1025. When transmission 1023 is in a non-self-locking state, transmission 1023 can transmit the power of drive motor 1021 to wheels 1025. The electric drive system 102 may also include a central control unit, drive controller, and the like.

Electronic parking brake system 103 is used for providing braking force for wheel 1025, realizes electronic parking. The electronic parking brake system 103 includes a parking module 1031 and an electronic parking brake control module 1035. In the present embodiment, the number of the electronic parking brake control modules 1035 is at least one, the number of the parking modules 1031 is at least one, and each parking module 1031 is correspondingly connected with one electronic parking brake control module 1035 in a communication manner, so as to improve the control accuracy and the control efficiency. The parking module 1031 includes a parking drive unit 1036 and a parking brake actuation unit 1038. The parking drive unit 1036 is used to provide power to the parking brake actuating unit 1038. The parking brake execution unit 1038 is configured to supply a parking brake force to the wheels 1025. The parking brake actuating unit 1038 may clamp or release the wheel 1025. In the present embodiment, parking drive unit 1036 includes a driving device such as a motor.

The vehicle control unit 107 is a core control component of the new energy vehicle 1000, and plays roles of data exchange and management, fault diagnosis, safety monitoring, driver intention analysis, and the like of each system of the new energy vehicle 1000. The vehicle control unit 107 is communicatively connected to the power supply system 101, the electric drive system 102, the electronic parking brake system 103, and the like. The hybrid controller 107 may include one or more processors. The processor may include one or more processors (logic circuits) that provide information processing capability in the new energy vehicle 1000. The processor may provide one or more computing functions for the new energy vehicle 1000. The processor may operate/transmit a command signal to one or more components of the new energy vehicle 1000 to operate the new energy vehicle 1000. The processor may include a memory, such as a random access memory device (RAM), a flash memory, or another suitable type of memory device, such as a non-transitory computer-readable memory. The memory of the processor may include executable instructions and data that may be accessed by one or more processors of the processor. For example, a processor may include one or more Dynamic Random Access Memory (DRAM) modules, such as double data rate synchronous dynamic random access memory (DDR SDRAM). In some implementations, the processor may include a Digital Signal Processor (DSP). In some implementations, the processor may include an Application Specific Integrated Circuit (ASIC).

The vehicle control unit 107 is configured to control the electric drive system 102 and the electronic parking brake system 103 according to a driving instruction. The driving command includes a brake command, a parking command, a release parking command, and the like.

For example, the new energy vehicle 1000 further includes a service braking system 108 for performing service braking. The service braking system 108 includes a brake pedal (not shown), a sensor disposed on the brake pedal, and a brake execution unit. A user (e.g., a driver) can perform a braking operation by depressing the brake pedal. Sensors on the brake pedal generate braking commands in response to user braking operations. The vehicle control unit 107 transmits a braking signal to the drive motor 1021 according to the braking command. The driving motor 1021 stops rotating according to the braking signal, the braking execution unit brakes the wheels 1025, the wheels 1025 stops rotating, and the new energy automobile 1000 stops. It can be understood that, in the application, the user does not limit the brake operation by stepping on the brake pedal, and the user can perform the brake operation on the new energy automobile 1000 through other devices and modes. In some embodiments, the new energy vehicle 1000 further includes a sensing system (not shown), and the vehicle control unit 107 of the new energy vehicle 1000 may also perform analysis according to information and data collected by the sensing system of the new energy vehicle 1000, for example, the vehicle control unit 107 controls the new energy vehicle 1000 to automatically stop when it confirms that an emergency (such as a suddenly rushing-in pedestrian) occurs in the driving direction according to the information collected by the sensing system.

For example, the electronic parking brake system 103 further includes a parking button communicatively connected to the vehicle control unit 107, and a user may perform a parking operation by pressing the parking button, and the parking button generates a parking command in response to the parking operation by the user. The vehicle control unit 107 sends a parking signal to the electronic parking brake control module 1035 and the automatic transmission control module 1027 according to a parking command. The electronic parking brake control module 1035 controls the parking drive unit 1036 to drive the parking brake execution unit 1038 to clamp the wheel 1025 according to the parking signal, so that the electronic parking brake function is realized. It can be understood that, the parking operation performed by the user through the parking button is not limited in the present application, and the user may perform the parking operation on the new energy vehicle 1000 through other devices and manners. The automatic transmission control module 1027 controls the transmission 1023 to enter a self-locking state according to the parking signal, so that the wheels 1025 cannot move, the electronic parking function of the transmission 1023 is realized, and the new energy automobile 1000 has double insurance in parking. Because additional parking structures do not need to be additionally added, an additional electronic parking function is realized through the speed changing device 1023, the occupied space of the electronic parking braking system 103 is reduced, and the light weight development of the new energy automobile 1000 is facilitated. In some embodiments, the new energy vehicle 1000 further includes a sensing system (not shown), and the vehicle control unit 107 of the new energy vehicle 1000 may also perform automatic parking after analyzing according to information and data collected by the sensing system of the new energy vehicle 1000.

When the parking of the new energy vehicle 1000 needs to be released, the user performs the parking releasing operation on the new energy vehicle 1000. For example, the user may perform a parking release operation by pressing a parking button that generates a parking release command in response to the user's parking release operation. The vehicle control unit 107 transmits a parking release signal to the electronic parking brake control module 1035 and the automatic transmission control module 1027 according to the parking release instruction. The electronic parking brake control module 1035 controls the parking drive unit 1036 to drive the parking brake execution unit 1038 to release the wheels 1025 according to the parking release signal, and the new energy automobile 1000 releases the parking.

The structure of the speed changing device 1023 is further described below with reference to the drawings.

More specifically, referring to fig. 3, the speed changing device 1023 includes a first stage transmission unit 12, a second stage transmission unit 13, an intermediate shaft 141, an intermediate shaft gear 143, a first clutch unit 15, a second clutch unit 16, a third clutch unit 17 and a differential unit 19. The drive motor 1021 includes a drive body 1022 and an input shaft 1024. The drive body 1022 is used to drive the input shaft 1024 for rotation. The primary transmission unit 12 is in transmission connection with the input shaft 1024. The secondary transmission unit 13 is in transmission connection with the input shaft 1024. The intermediate shaft gear 143 is fixedly secured to the intermediate shaft 141. The first clutch unit 15 is provided between the intermediate shaft 141 and the primary transmission unit 12, and the first clutch unit 15 is used to couple or decouple power transmission between the intermediate shaft 141 and the primary transmission unit 12. The second clutch unit 16 is provided between the intermediate shaft 141 and the secondary transmission unit 13, and the second clutch unit 16 is used to couple or decouple the power transmission between the intermediate shaft 141 and the secondary transmission unit 13. The third clutch unit is disposed between the counter gear 143 and the primary transmission unit 12, and is used to couple or decouple the power transmission between the counter gear 143 and the primary transmission unit 12.

When transmission 1023 is in a self-locking state, intermediate shaft 141 cannot rotate, and transmission 1023 cannot transmit the power of drive motor 1021 to wheels 1025. When speed change device 1023 is in the non-self-locking state, jackshaft 141 can rotate, and speed change device 1023 can transmit the power of drive motor 1021 to wheel 1025. When the automatic shift control module 1027 receives the parking signal, the automatic shift control module 1027 controls the transmission 1023 to enter a self-locking state. When the automatic shift control module 1027 receives the parking release signal, the automatic shift control module 1027 controls the transmission 1023 to enter a non-self-locking state.

In the present embodiment, when the first clutch unit 15 is engaged with the power transmission between the intermediate shaft 141 and the primary transmission unit 12, the second clutch unit 16 is engaged with the power transmission between the intermediate shaft 141 and the secondary transmission unit 12, and the third clutch unit 17 is engaged with the power transmission between the intermediate shaft gear 14 and the primary transmission unit 12, the transmission ratio when the third clutch unit 17 is engaged with the intermediate shaft gear 143 is different from the transmission ratio when the second clutch unit 12 is engaged with the intermediate shaft 141, and the transmission 1023 is in the self-locking state. The vehicle control unit 107 sends a parking signal to the electronic parking brake control module 1035 and the automatic transmission control module 1027. The automatic shift control module 1027 controls the transmission 1023 to enter a self-locking state.

After transmission 1023 enters the self-locking state, because jackshaft 141 can not rotate, wheel 1025 can be prevented from rotating, and then the possibility of wheel 1025 rotating is reduced, in other words, transmission 1023 is equivalent to another set of parking brake system of new energy automobile 1000, double insurance when parking new energy automobile 1000 is realized, and the possibility of accident occurrence is reduced. Because an additional parking mechanism is not required to be added, the transmission 1023 of the electric drive system 102 and the electronic parking brake system 103 of the new energy automobile 1000 form an electronic parking brake redundant system, the safety of the new energy automobile 1000 is improved, the occupied volume of the electronic parking brake redundant system can be reduced, and the lightweight development of the new energy automobile 1000 is facilitated.

The transmission 1023 is in a non-self-locking state when the first clutch unit 15 engages power transmission between the intermediate shaft 141 and the primary transmission unit 12, the second clutch unit 16 engages power transmission between the intermediate shaft 141 and the secondary transmission unit 13, and the third clutch unit 17 disengages the intermediate shaft gear 143 to disconnect power transmission between the intermediate shaft gear 143 and the primary transmission unit 12.

The primary transmission unit 12 includes a primary transmission input gear 121 and a primary transmission output gear 123. The primary drive input gear 121 is mounted on the input shaft 1024 and is rotatable with the input shaft 1024. It is understood that the primary transmission input gear 121 may be directly mounted on the input shaft 1024 or indirectly connected to the input shaft 1024 via a connecting mechanism, and the primary transmission input gear 121 may rotate along with the input shaft 1024. The primary drive output gear 123 meshes with the primary drive input gear 121 for driving connection with the countershaft 141. Since the primary transmission unit 12 includes the primary transmission input gear 121 and the primary transmission output gear 123, flexibility of layout of internal components of the speed change device 1023 is improved, and the occupied space of the speed change device 1023 is reduced.

It is understood that the primary transmission unit 12 may omit the primary transmission output gear 123, and directly connect the primary transmission input gear 121 with the first clutch unit 15.

The secondary transmission unit 13 includes a secondary transmission input gear 131 and a secondary transmission output gear 133. The secondary drive input gear 131 is mounted on the input shaft 1024 and is rotatable with the input shaft 1024. The secondary drive output gear 133 is meshed with the secondary drive input gear 131 for driving connection with the countershaft 141. It will be appreciated that the secondary drive input gear 131 may be mounted directly on the input shaft 1024 or may be indirectly connected to the input shaft 1024 via a coupling mechanism, such that the secondary drive input gear 131 rotates with the input shaft 1024. Since the two-stage transmission unit 13 includes the two-stage transmission input gear 131 and the two-stage transmission output gear 133, flexibility of layout of internal components of the transmission 1023 is improved, and the occupied space of the transmission 1023 is reduced.

It is understood that the two-stage transmission unit 13 may omit the two-stage transmission output gear 133, and directly connect the two-stage transmission input gear 131 with the second clutch unit 16 and so on.

The intermediate shaft unit 14 further includes a first bearing 145 and a second bearing 147. The intermediate shaft gear 143 is fixed to the intermediate shaft 141, and is used for connection with the differential gear unit 17. The primary transmission output gear 123 is rotatably sleeved on the intermediate shaft 141. The first bearing 145 is disposed between the first-stage transmission output gear 123 and the intermediate shaft 141 to improve the smoothness of the relative movement between the first-stage transmission output gear 133 and the intermediate shaft 141. The second bearing 147 is provided between the secondary transmission output gear 133 and the intermediate shaft 141 to improve the smoothness of the relative movement between the secondary transmission output gear 133 and the intermediate shaft 141.

In the present embodiment, the first clutch unit 15 includes a one-way clutch. The one-way clutch includes an outer ring, an inner ring, and a sprag pack between the inner and outer rings. The one-way clutch may be a sprag brake or a roller brake. The outer ring is fixedly connected with the first-stage transmission output gear 123, and the inner ring is fixedly connected with the intermediate shaft 141. The first clutch unit 15 includes a non-engaged state (also referred to as a disengaged state) and an engaged state (also referred to as a stationary state). When the first clutch unit 15 is in a non-coupling state, the inner ring and the outer ring are not in contact with each other, that is, the one-way clutch is in free rotation, the one-way clutch cannot drive the intermediate shaft 141 to rotate along with the primary transmission output gear 123. When the two-way clutch rotates in the other direction, the inner ring and the outer ring are in close contact, the one-way clutch can transmit high torque, the first clutch unit 15 can drive the intermediate shaft 141 to rotate along with the primary transmission output gear 123, and the primary transmission output gear 123 can transmit the power of the input shaft 1024 to the intermediate shaft 141. In other words, when the first clutch unit 15 is in the engaged state, the power of the input shaft 1024 can be transmitted to the intermediate shaft 141 via the primary transmission output gear 123. It is to be understood that the present application is not limited to the structure of the first clutch unit 15, and the power transmission between the first clutch unit 15 and the intermediate shaft 141 may be connected or disconnected.

In the present embodiment, the second clutch unit 16 includes one of a friction plate clutch and an electromagnetic clutch. The friction plate clutch comprises four groups of points, namely a driving part, a driven part, a pressing mechanism and an operating mechanism. The driving part, the driven part and the pressing mechanism are basic structures which ensure that the friction plate clutch is in a combined state and can transmit power, and the operating mechanism of the clutch is mainly a device for separating the friction plate clutch. The electromagnetic clutch is a friction clutch that generates a pressing force by an electromagnetic force. Electromagnetic clutches are also known as electromagnetic couplings. The electromagnetic clutch is an electromagnetic mechanical connector which uses the electromagnetic induction principle and the friction force between an inner friction plate and an outer friction plate to enable two parts in a mechanical transmission system to rotate, and a driven part can be combined with or separated from the driving part under the condition that the driving part does not stop rotating, so that the electromagnetic clutch is an automatic executing electric appliance.

The second clutch unit 16 includes a disengaged state and an engaged state. When the second clutch unit 16 is in the disengaged state, the second clutch unit 16 disconnects the power transmission between the secondary transmission output gear 133 and the intermediate shaft 141. When the second clutch unit 16 is in the engaged state, the second clutch unit 16 connects the secondary transmission output gear 133 and the intermediate shaft 141, and the second clutch unit 16 engages power transmission between the secondary transmission output gear 133 and the intermediate shaft 141. It is to be understood that the present application is not limited to the structure of the second clutch unit 16, and the power transmission between the second clutch unit 16 and the intermediate shaft 141 may be connected or disconnected.

The third clutch unit 17 includes a third clutch 171, an actuator connecting member 173, and an actuator 175. The third clutch 171 is provided between the counter shaft gear 143 and the primary transmission output gear 123 of the primary transmission unit 12. The third clutch 171 is fixedly connected to the primary transmission output gear 123. Actuator link 173 is coupled to actuator 175. The actuator 175 is used to control the axial movement of the actuator connection 173 along the counter shaft 141 to engage the third clutch 171 with the counter gear 143 or to disengage the third clutch 171 from the counter gear 143. The third clutch 171 includes a disengaged state and an engaged state. The third clutch 171 is a dog clutch. When the third clutch 171 is in the engaged state, the third clutch 171 is engaged with the counter gear 143. When the third clutch 171 is in the disengaged state, the third clutch 171 is disengaged from the counter gear 143. The gear ratio of the third clutch 171 in combination with the counter gear 143 is different from the gear ratio of the second clutch unit 16 in combination with the counter shaft 141. When the new energy automobile 1000 is in the self-locking state, the third clutch 171 is coupled to the intermediate shaft gear 143, the second clutch unit 16 is coupled to the intermediate shaft 141, and since the transmission ratio when the third clutch 171 is coupled to the intermediate shaft gear 143 is different from the transmission ratio when the second clutch unit 16 is coupled to the intermediate shaft 141, the intermediate shaft 141 cannot move, the power of the input shaft 1024 cannot be transmitted to the differential unit 19 through the primary transmission unit 12, the secondary transmission unit 13, and the intermediate shaft unit 14, and the self-locking of the speed change device 1023 is achieved. The actuator 175 may be an electronic button or a mechanical operator. It is to be understood that the present application is not limited to the structure of the third clutch unit 17, and the power transmission between the third clutch unit 17 and the counter gear 143 may be connected or disconnected.

The differential unit 19 includes a final drive input gear 191, a final drive output gear 193, and a differential 195. The main reduction transmission input gear 191 is sleeved on the intermediate shaft 141. The final drive output gear 193 meshes with the final drive input gear 191. The differential 195 is drivingly connected to the final drive output gear 193. When the new energy automobile 1000 is in a driving state, the first clutch unit 15 is in an engaged state, the second clutch unit 16 is in an engaged state, and the third clutch unit 17 is in a non-engaged state. The output shaft of differential 195 is connected to wheels 1025.

The first clutch unit 15 is in the engaged state, and the first clutch unit 15 is connected between the primary transmission output gear 123 and the intermediate shaft 141. The second clutch unit 16 is in the engaged state, and the second clutch unit 16 is connected between the secondary transmission output gear 133 and the intermediate shaft 141. The third clutch unit 17 is in a non-engaged state, and the third clutch 171 is disengaged from the counter gear 143. An input shaft 1024 of the driving motor 1021 rotates, and the primary transmission output gear 123 and the secondary transmission output gear 133 drive the intermediate shaft 141 to rotate. The rotation of the intermediate shaft 141 drives the main reduction transmission output gear 193 and the main reduction transmission input gear 191 to rotate, and the differential 195 drives the wheels 1025 to rotate, so that the power of the driving motor 1021 is transmitted to the wheels 1025. When the new energy automobile 1000 is in a parking state, the intermediate shaft 141 does not rotate, the parking brake execution unit 1038 clamps the wheels 1025, and the speed change device 1023 is self-locked, so that double insurance during parking of the new energy automobile 1000 is realized.

It is to be understood that the application is not limited to the application of the transmission 1023 to the new energy vehicle 1000, and the application may be applied to other devices or apparatuses, for example, a robot or the like.

Referring to fig. 4, a new energy vehicle 1000 according to a second embodiment of the present application has a structure that is substantially similar to that of the new energy vehicle according to the first embodiment, except that the number of parking modules 1031 is two, the number of electronic parking brake control modules 1035 is one, and both parking drive units 1036 of the two parking modules 1031 are in communication connection with the electronic parking brake control modules 1035. Since the two parking modules 1031 share one electronic parking brake control module 1035, the occupied space of the new energy vehicle 1000 is reduced and the cost is reduced.

It should be understood that expressions such as "include" and "may include" that may be used in the present application indicate the presence of the disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements. In the present application, terms such as "including" and/or "having" may be interpreted as indicating specific characteristics, numbers, operations, constituent elements, components, or combinations thereof, but may not be interpreted as excluding the existence or addition possibility of one or more other characteristics, numbers, operations, constituent elements, components, or combinations thereof.

Further, in this application, the expression "and/or" includes any and all combinations of the associated listed words. For example, the expression "a and/or B" may include a, may include B, or may include both a and B.

In the present application, expressions including ordinal numbers such as "first" and "second" and the like may modify the respective elements. However, such elements are not limited by the above expression. For example, the above description does not limit the order and/or importance of the elements. The above expressions are only used to distinguish one element from another. For example, the first user equipment and the second user equipment indicate different user equipments, although both the first user equipment and the second user equipment are user equipments. Similarly, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present application.

When a component is referred to as being "connected" or "accessed" to other components, it should be understood that: not only does the component connect or tap directly to other components, but there may be another component between the component and the other components. On the other hand, when components are referred to as being "directly connected" or "directly accessing" other components, it is understood that no components exist therebetween.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.