CN108001202B

CN108001202B - Power transmission system of vehicle and vehicle with same

Info

Publication number: CN108001202B
Application number: CN201610947841.2A
Authority: CN
Inventors: 凌和平; 翟震; 黄威; 徐友彬
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2016-10-31
Filing date: 2016-10-31
Publication date: 2020-02-21
Anticipated expiration: 2036-10-31
Also published as: CN108001202A

Abstract

The invention discloses a power transmission system of a vehicle and the vehicle with the same, wherein the power transmission system of the vehicle comprises: a power source; a first motor generator unit; a system power output; and the mode conversion device comprises a conversion device input part and a conversion device output part, the conversion device input part is selectively in power coupling connection with the power source, the conversion device input part is in power coupling connection with the first motor generator unit, the conversion device output part is fixedly arranged on a shell of the system power output part, the conversion device input part is selectively connected with the conversion device output part, and when the conversion device input part is disconnected with the conversion device output part, the power source is suitable for driving the first motor generator unit to generate power through the conversion device input part. The power transmission system can increase the working modes of the power transmission system, and particularly greatly enriches the application of the vehicle in a parking power generation mode.

Description

Power transmission system of vehicle and vehicle with same

Technical Field

The invention belongs to the technical field of transmission, and particularly relates to a power transmission system of a vehicle and the vehicle with the power transmission system.

Background

With the continuous consumption of energy, the development and utilization of new energy vehicles have gradually become a trend. The hybrid vehicle, which is one of new energy vehicles, is driven by an engine and/or a motor, has various modes, and can improve transmission efficiency and fuel economy.

However, in the related art known by the inventor, some hybrid vehicles have few driving modes and low driving transmission efficiency, and cannot meet the requirement of the vehicle for adapting to various road conditions, especially after the hybrid vehicle is fed (when the battery power is insufficient), the power performance and the passing capacity of the whole vehicle are insufficient. In addition, in order to realize the parking power generation working condition, a transmission mechanism needs to be additionally added, the integration level is low, and the power generation efficiency is low.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. To this end, it is an object of the present invention to provide a powertrain system for a vehicle having multiple operating modes.

Another object of the present invention is to propose a vehicle having the above-mentioned power transmission system.

A power train system of a vehicle according to an embodiment of the first aspect of the invention includes: a power source; a first motor generator unit; a system power output; the mode conversion device comprises a conversion device input part and a conversion device output part, the conversion device input part is selectively in power coupling connection with the power source, the conversion device input part is in power coupling connection with the first motor generator unit, the conversion device output part is fixedly arranged on a shell of the system power output part, the conversion device input part is selectively connected with the conversion device output part, and when the conversion device input part is disconnected with the conversion device output part, the power source is suitable for driving the first motor generator unit to generate power through the conversion device input part.

According to the power transmission system of the embodiment of the first aspect of the invention, by providing the mode switching device in the above-described structural form, the operating modes of the power transmission system can be increased, and particularly, the vehicle application can be greatly enriched in the parking power generation mode.

A vehicle according to an embodiment of the second aspect of the invention is provided with the power transmission system of any one of the embodiments of the first aspect.

The vehicle has the same advantages of the power transmission system compared with the prior art, and the detailed description is omitted.

Drawings

FIGS. 1-6 are schematic structural diagrams of a powertrain system according to an embodiment of the present invention;

4-13 are schematic diagrams of mode shift devices, a coupling structure of a system power output and half shafts, according to an embodiment of the present invention;

FIGS. 14-19 are schematic views of an installation configuration of an electric drive system according to an embodiment of the present invention;

fig. 20 to 27 are schematic structural views of a power transmission system according to an embodiment of the invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

On a hybrid vehicle, the vehicle may be provided with a plurality of driving systems, for example, a power transmission system 1000, the power transmission system 1000 may be used for driving front wheels or rear wheels of the vehicle, and the following description will take the power transmission system 1000 for driving the front wheels of the vehicle as an example for details, however, in some alternative embodiments, the vehicle may also drive the rear wheels of the vehicle to rotate in combination with other driving systems, so that the vehicle is a four-wheel driving vehicle, for example, the vehicle may also drive the rear wheels of the vehicle to rotate in combination with an electric driving system 700.

The power transmission system 1000 according to the embodiment of the present invention will be described in detail below with reference to the accompanying drawings, and the power transmission system 1000 may be applied to a vehicle, such as a hybrid vehicle.

As shown in fig. 1-3, the powertrain 1000 may include: power source 100, first motor generator unit 300, system power output 401, and mode switching device 402, but power transmission system 1000 may also include other mechanical components, such as second motor generator 600, first clutch device L1, and the like.

The power source 100 may be an engine, and the power transmission system 1000 may further include a transmission unit 200, the transmission unit 200 may be adapted to be selectively coupled with the power source 100, as shown in fig. 1-3, the power source 100 and the transmission unit 200 may be axially connected, wherein a first clutch device L1 may be disposed between the power source 100 and the transmission unit 200, and the first clutch device L1 may control an engaged and disengaged state between the power source 100 and the transmission unit 200. Specifically, the first clutch device L1 may be the dual clutch 202 in fig. 20-27. The shifting unit 200 is power-coupled with the final drive driven gear Z 'so that the power from the power source 100 is output to the final drive driven gear Z' through the shifting unit 200.

The speed changing unit 200 only needs to realize speed and torque changing for engine power, can completely use the speed changing of a common fuel vehicle, does not need additional design change, is beneficial to the miniaturization of the speed changing unit 200, and can reduce the development cost of the whole vehicle and shorten the development period. The speed changing unit 200 can have various arrangements, for example, the speed changing unit 200 can be a transmission, or can be some other gear reducers that realize speed changing functions, and the speed changing unit 200 is further described below as an example of a transmission, wherein changes of an input shaft, an output shaft, and gears can form a new speed changing unit 200, and first, the speed changing unit 200 in the power transmission system 1000 shown in fig. 20-23 and 27 is described in detail as an example.

As shown in fig. 20 to 23 and 27, the shifting unit 200 may include: a transmission power input selectively engageable with the power source 100 to transmit power generated by the power source 100, a transmission power output, and a transmission unit output 201. The first clutch device L1 may include an input connected to the power source 100 and an output connected to the variable speed power input, the power source 100 and the variable speed power input being engaged to transmit power when the input and output are engaged.

The transmission power output portion is configured and adapted to output power from the transmission power input portion to the transmission unit output portion 201 through synchronization of the transmission unit synchronizer, the transmission unit output portion 201 being in power coupling connection with the mode switching device 402.

Specifically, as shown in fig. 20-23 and 27, the variable speed power input may include at least one input shaft, each of which is selectively engageable with the power source 100, with at least one drive gear disposed on each input shaft.

The speed change power output portion includes: at least one output shaft, each output shaft having at least one driven gear disposed thereon, a speed change unit synchronizer disposed on the output shafts for selective synchronization between the driven gears and the output shafts to cause the driven gears to rotate synchronously with the output shafts. The driven gears are engaged with corresponding driving gears, the output part 201 of the speed changing unit is at least one main reducer driving gear Z, the at least one main reducer driving gear Z is fixed on at least one output shaft in a one-to-one correspondence, and the main reducer driving gear Z is engaged with a main reducer driven gear Z'. That is, the transmission unit output 201 may be an output gear on an output shaft, which may be fixed on a corresponding output shaft, the output gear being engaged with the final drive driven gear Z' to perform power transmission.

Wherein the input shaft may be plural and the plural input shafts may be sequentially nested coaxially, the power source 100 may be selectively engaged with at least one of the plural input shafts when the power source 100 transmits power to the input shafts.

Referring to fig. 20-23 and 27, the speed change power input portion may include a first input shaft i and a second input shaft ii, the second input shaft ii is coaxially sleeved on the first input shaft i, and at least one driving gear is fixedly disposed on each of the first input shaft i and the second input shaft ii; the speed change power output portion includes: the first output shaft III and the second output shaft IV are respectively sleeved with at least one driven gear in an idle mode, one of the first output shaft III and the second output shaft IV is sleeved with a reverse gear driven gear Rb in an idle mode, the at least one driven gear is correspondingly meshed with the at least one driving gear, and the driven gear and the reverse gear driven gear Rb are selectively jointed with the corresponding output shafts; the gear shift unit 200 further comprises a reverse intermediate shaft V, on which a first reverse intermediate gear Rm1 and a second reverse intermediate gear Rm2 are fixedly arranged, the first reverse intermediate gear Rm1 being engaged with one of the at least one driving gear, the second reverse intermediate gear Rm2 being engaged with the reverse driven gear Rb.

Referring to fig. 24-26, the speed change power input portion includes a first input shaft i and a second input shaft ii, the second input shaft ii is coaxially sleeved on the first input shaft i, at least one first driving gear is fixedly disposed on the first input shaft i and the second input shaft ii respectively, at least one second driving gear is respectively sleeved on the first input shaft i and the second input shaft ii in an empty manner, the second driving gear is selectively engaged with the corresponding input shaft, and a reverse gear driving gear Ra is further fixedly disposed on one of the first input shaft i and the second input shaft ii; the speed change power output part comprises a power output shaft III ', a reverse gear driven gear Rb and at least one first driven gear are sleeved on the power output shaft III', the first driven gear is correspondingly meshed with the first driving gear, at least one second driven gear is fixedly arranged on the power output shaft III ', the second driven gear is correspondingly meshed with the second driving gear, and the reverse gear driven gear Rb and the first driven gear are selectively jointed with the power output shaft III'; the speed change unit 200 further includes a reverse gear intermediate shaft V, on which an idler gear IG is fixedly disposed, the idler gear IG being engaged with the reverse gear driving gear Ra and engaged with the reverse gear driven gear Rb.

Specifically, as shown in fig. 20 to 23 and 27, the shifting unit 200 may be a six-speed transmission, and the shifting power input portion may include: the first input shaft i and the second input shaft ii, the first clutch device L1 may be a dual clutch 202, the dual clutch 202 having an input, a first output K1 and a second output K2, the input of the dual clutch 202 selectively engaging at least one of the first output K1 and the second output K2. That is, the input of the dual clutch 202 may engage the first output K1, or the input of the dual clutch 202 may engage the second output K2, or the input of the dual clutch 202 may engage both the first output K1 and the second output K2. The first output K1 is connected to the first input shaft i and the second output K2 is connected to the second input shaft ii.

As shown in fig. 20 to 23 and 27, the first input shaft i is fixedly provided with a first-gear drive gear 1a, a third-gear drive gear 3a and a fifth-gear drive gear 5a, and the second input shaft ii is fixedly provided with a second-gear drive gear 2a and a fourth-sixth-gear drive gear 46 a. The second input shaft II is sleeved on the first input shaft I, so that the axial length of the power transmission system 1000 can be effectively shortened, and the space occupied by the power transmission system 1000 in a vehicle can be reduced. The above-mentioned fourth-sixth gear driving gear 46a means that the gear can be used as both the fourth gear driving gear and the sixth gear driving gear, so that the axial length of the second input shaft ii can be shortened, and the size of the power transmission system 1000 can be reduced.

The arrangement order of the plurality of gear driving gears is two-gear driving gear 2a, four-sixth gear driving gear 46a, three-gear driving gear 3a, first gear driving gear 1a, and fifth gear driving gear 5a according to the distance from the power source 100. Through the position of a plurality of fender position driving gears of rational arrangement, can be so that the position of a plurality of fender position driven gears and a plurality of output shaft arranges rationally to can make power transmission system 1000 simple structure, it is small.

The output shaft may include: the first output shaft III is sleeved with a first-gear driven gear 1b, a second-gear driven gear 2b, a third-gear driven gear 3b and a fourth-gear driven gear 4b, and the second output shaft IV is sleeved with a fifth-gear driven gear 5b, a sixth-gear driven gear 6b and a reverse-gear driven gear Rb.

One of them keeps off driving gear 1a and one keeps off driven gear 1b meshing, and two keep off driving gear 2a and two keep off driven gear 2b meshing, and three keep off driving gear 3a and three keep off driven gear 3b meshing, and four-sixth keep off driving gear 46a and four-sixth keep off driven gear 4b meshing, and five keep off driving gear 5a and five keep off driven gear 5b meshing, and four-sixth keep off driving gear 46a and six keep off driven gear 6b meshing.

A third speed synchronizer S13 is provided between the first speed driven gear 1b and the third speed driven gear 3b, and the third speed synchronizer S13 can be used for synchronizing the first speed driven gear 1b and the first output shaft iii, and can be used for synchronizing the third speed driven gear 3b and the first output shaft iii.

A second-fourth synchronizer S24 is provided between the second-gear driven gear 2b and the fourth-gear driven gear 4b, and the second-fourth synchronizer S24 can be used for synchronizing the second-gear driven gear 2b and the first output shaft iii, and can be used for synchronizing the fourth-gear driven gear 4b and the first output shaft iii.

A fifth-speed synchronizer S5 is provided at one side of the fifth-speed driven gear 5b, and the fifth-speed synchronizer S5 can be used to synchronize the fifth-speed driven gear 5b and the second output shaft iv.

A sixth reverse synchronizer S6R is provided between the reverse driven gear Rb and the sixth driven gear 6b, and the sixth reverse synchronizer S6R may be used to synchronize the reverse driven gear Rb and the second output shaft iv, and may be used to synchronize the sixth driven gear 6b and the second output shaft iv. This can save the number of synchronizers disposed on the second output shaft iv, so that the axial length of the second output shaft iv can be shortened, and the cost of the power transmission system 1000 can be reduced.

Furthermore, a first reverse intermediate gear Rm1 and a second reverse intermediate gear Rm2 are fixedly arranged on the reverse intermediate shaft V, the first reverse intermediate gear Rm1 is meshed with one of the gear driving gears, and the second reverse intermediate gear Rm2 is meshed with the reverse driven gear Rb. Specifically, the first reverse intermediate gear Rm1 can be meshed with the first gear driving gear 1a, the first gear driving gear 1a is a reverse driving gear 1Ra, power transmitted to the first reverse driving gear 1Ra can be transmitted to the reverse intermediate shaft V through the first reverse intermediate gear Rm1, the reverse intermediate shaft V can transmit power to the reverse driven gear Rb through the second reverse intermediate gear Rm2, the reverse driven gear Rb can transmit power to the second output shaft iv through the reverse synchronizer, the second output shaft iv can transmit power to the main reducer driven gear Z 'through the second output shaft iv output gear, and the main reducer driven gear Z' can be transmitted to wheels on two sides through the system power output part 401 to drive the vehicle to move.

Of course, the specific arrangement form of the shifting unit 200 is not limited thereto, and another arrangement form of the shifting unit 200 is described in detail below in conjunction with fig. 24 to 26.

As shown in fig. 24 to 26, the shifting unit 200 may be a six-speed transmission, and the shifting power input portion may include: first input shaft I and second input shaft II, II coaxial sleeves of second input shaft are established on first input shaft I, can effectively shorten power transmission system 1000's axial length like this to can reduce power transmission system 1000 and occupy the space of vehicle.

The first clutch device L1 may be a dual clutch 202, the dual clutch 202 having an input, a first output, and a second output, the input selectively engaging at least one of the first and second outputs. That is, the input may engage the first output, or the input may engage the second output, or the input may engage both the first output and the second output.

First input shaft I goes up fixed one and is provided with a fender driving gear 1a and three fender driving gear 3a, and the cover is gone up to first input shaft I has five fender driving gears 5a, and the fixed two fender driving gears 2a and reverse gear driving gear Ra that are provided with on second input shaft II, and the cover is gone up to second input shaft II has four fender driving gears 4a and six fender driving gears 6 a. The second input shaft II is sleeved on the first input shaft I, so that the axial length of the power transmission system 1000 can be effectively shortened, and the space occupied by the power transmission system 1000 in a vehicle can be reduced.

The arrangement sequence of the plurality of gear driving gears is a four-gear driving gear 4a, a six-gear driving gear 6a, a two-gear driving gear 2a, a reverse driving gear Ra, a first-gear driving gear 1a, a three-gear driving gear 3a and a five-gear driving gear 5a in a manner of being close to or far from the power source 100. Through the position of a plurality of fender position driving gears of rational arrangement, can be so that the position of a plurality of fender position driven gears and a plurality of output shaft arranges rationally to can make power transmission system 1000 simple structure, it is small.

A first-gear driven gear 1b, a second-gear driven gear 2b, a third-gear driven gear 3b and a reverse-gear driven gear Rb are sleeved on the power output shaft III ', and a fifth-gear driven gear 5b, a sixth-gear driven gear 6b and a fourth-gear driven gear 4b are fixedly arranged on the power output shaft III'.

One of them keeps off driving gear 1a and one keeps off driven gear 1b meshing, and two keep off driving gear 2a and two keep off driven gear 2b meshing, and three keep off driving gear 3a and three keep off driven gear 3b meshing, and four keep off driving gear 4a and four keep off driven gear 4b meshing, and five keep off driving gear 5a and five keep off driven gear 5b meshing, and six keep off driving gear 6a and six keep off driven gear 6b meshing.

A third speed synchronizer S13 is provided between the first speed driven gear 1b and the third speed driven gear 3b, and the third speed synchronizer S13 can be used for synchronizing the first speed driven gear 1b and the power output shaft iii ', and can be used for synchronizing the third speed driven gear 3b and the power output shaft iii'. This can save the number of synchronizers disposed on the power output shaft iii ', so that the axial length of the power output shaft iii' can be shortened, and the cost of the power transmission system 1000 can be reduced.

A second reverse synchronizer S2R is provided between the second-gear driven gear 2b and the reverse driven gear Rb, and the second reverse synchronizer S2R can be used to synchronize the second-gear driven gear 2b and the power output shaft iii ', and can be used to synchronize the reverse driven gear Rb and the power output shaft iii'. This can save the number of synchronizers disposed on the power output shaft iii ', so that the axial length of the power output shaft iii' can be shortened, and the cost of the power transmission system 1000 can be reduced.

A fourth-sixth synchronizer S46 is provided between the fourth-speed drive gear 4a and the sixth-speed drive gear 6a, and the fourth-sixth synchronizer S46 may be used to synchronize the fourth-speed drive gear 4a with the second input shaft ii, and may be used to synchronize the sixth-speed drive gear 6a with the second input shaft ii. This can save the number of synchronizers disposed on the second input shaft ii, so that the axial length of the second input shaft ii can be shortened, and the cost of the power transmission system 1000 can be reduced.

One side of the fifth gear driving gear 5a is provided with a fifth gear synchronizer S5, and the fifth gear synchronizer S5 may be used to synchronize the fifth gear driving gear 5a with the first input shaft i.

Further, an idler gear IG is fixedly arranged on the reverse intermediate shaft V, and the idler gear IG is meshed with the reverse driving gear Ra and meshed with the reverse driven gear Rb.

At least one of the transmission unit 200 and the first motor generator unit 300 is power-coupled to or disconnected from the system power output portion 401 by a mode switching device 402, for example, the mode switching device 402 may be used to power-couple or disconnect the transmission unit 200 and the system power output portion 401, or the mode switching device 402 may be used to power-couple or disconnect the first motor generator unit 300 and the system power output portion 401, or the mode switching device 402 is used to power-couple or disconnect the transmission unit 200 and the first motor generator unit 300 and the system power output portion 401. When the mode switching means 402 disconnects at least one of the transmission unit 200 and the first motor generator unit 300 from the system power output portion 401, the power output from the power source 100 is adapted to drive the first motor generator unit 300 to generate power through the transmission unit 200 and the mode switching means 402 in order.

Preferably, referring to fig. 4-8, the mode shift device 402 may include a shift device input 4021 and a shift device output 4022, the shift device input 4021 being selectively engageable with the shift device output 4022, the shift device input 4021 being in power coupling connection with the first motor generator unit 300, the shift device output 4022 being fixedly disposed on the input 4011 of the system power output 401, the shift device input 4021 being selectively in power coupling connection with the power source 100, wherein, in embodiments where the powertrain 1000 includes the transmission unit 200, the shift device input 4021 is in power coupling connection with the transmission unit 200.

When power is transmitted between the converter input 4021 and the converter output 4022, there are two transmission modes, one is a direct transmission mode in which the rotational speed of the converter input 4021 is equal to the rotational speed of the converter output 4022, and the other is a step-down transmission mode in which the rotational speed of the converter input 4021 is higher than the rotational speed of the converter output 4022.

Referring to fig. 4-9, the converter input 4021 may be fitted empty on the half shaft 2000 of the vehicle and the converter output 4022 may be fitted on the half shaft 2000 of the vehicle.

Referring to fig. 4-13, the mode switching device 402 may further include a switching device synchronizer S for selectively synchronizing the switching device input 4021 with the switching device output 4022. When the inverter synchronizer S synchronizes the inverter input 4021 with the inverter output 4022, both the power source 100 and the first motor generator unit 300 are connected in power coupling with the system power output 401. In some alternative embodiments, the switching device synchronizer S is disposed on the switching device input 4021, and in other alternative embodiments, the switching device synchronizer S is disposed on the switching device output 4022.

In the embodiment shown in fig. 23, the switching device engager S may be located between the final drive driven gear Z' and the planetary gear mechanism P in the axial direction of the central axis of the planetary gear mechanism P. Like this, power transmission system 1000's compact structure, axial length is short, and can be convenient for the arrangement of shift fork mechanism, reduces shift fork mechanism's the degree of difficulty of arranging, and then can improve power transmission system 1000's the convenience of arranging to and control the convenience.

In the embodiment shown in fig. 20-23 and 24-26, the switching device engager S may be located between the system power output 401 and the planetary gear mechanism P in the axial direction of the central axis of the planetary gear mechanism P. Thus, the power transmission system 1000 is compact in structure and short in axial length.

Referring to fig. 20-26, the transmission unit 200 may include a transmission unit output 201, the first motor generator unit 300 may include a first motor generator unit coupling 301, and both the transmission unit output 201 and the first motor generator unit coupling 301 may be in power coupling connection with the shifter input 4021. Here, the transmission unit output part 201 and the first motor generator unit coupling part 301 may be both main reducer drive gears Z.

Referring to fig. 27, the first motor generator unit 300 includes a first motor generator 302 and a first motor generator unit coupling portion 301, the first motor generator 302 is in power coupling connection with the first motor generator unit coupling portion 301, and the first motor generator unit coupling portion 301 is in power coupling connection with the mode switching device 402.

Referring to fig. 20 to 27, the first motor generator unit 300 may further include a reduction chain 303, the first motor generator 302 is coupled to the first motor generator unit coupling portion 301 through the reduction chain 303, and the first motor generator unit coupling portion 301 is coupled to the mode switching device 402. That is, when the first motor generator 302 is used as a motor, the power generated by the first motor generator 302 can be transmitted to the converter input portion 4021 of the mode converter 402 via the reduction chain 303 and the first motor generator unit coupling portion 301.

In the embodiment of the present invention, the reduction chain 303 may have various structural forms.

Referring to fig. 26, the reduction chain 303 may include a pair of first and second gears Z1 and Z2 engaged with each other, the first gear Z1 being coaxially fixedly connected to the first motor generator 302, and the first motor generator unit coupling portion 301 being coaxially fixedly provided with the second gear Z2.

Referring to fig. 26, the reduction chain 303 may include a reduction chain input shaft 3031 and a reduction chain output shaft 3032, the reduction chain input shaft 3031 is fixedly connected to a motor shaft of the first motor generator 302, the reduction chain input shaft 3031 is fixedly connected to a first gear Z1, the reduction chain output shaft 3032 is fixedly connected to a second gear Z2 and a first motor generator unit coupling portion 301, the first motor generator unit coupling portion 301 is engaged with the main reducer driven gear Z', the first gear Z1 is engaged with the second gear Z2, and the diameter and the number of teeth of the second gear Z2 are greater than those of the first gear Z1.

Referring to fig. 20 to 25, the reduction chain 303 may include a pair of first and second gears Z1 and Z2 engaged with each other, the first gear Z1 being coaxially fixedly connected with the first motor generator 302, and the second gear Z2 being the first motor generator unit coupling portion 301.

Referring to fig. 20 to 25, the reduction chain 303 may include a reduction chain input shaft 3031 and a reduction chain output shaft 3032, the reduction chain input shaft 3031 is fixedly connected to a motor shaft of the first motor generator 302, a first gear Z1 is fixedly connected to the reduction chain input shaft 3031, a second gear Z2 is fixedly connected to the reduction chain output shaft 3032, the first gear Z1 is engaged with the second gear Z2, the second gear Z2 has a diameter and a number of teeth each larger than those of the first gear Z1, and the second gear Z2 may be the first motor generator unit coupling portion 301, and the first motor generator unit coupling portion 301 is engaged with the main reducer driven gear Z'.

Of course, the first motor generator unit 300 may be arranged without the reduction chain 303, and the first motor generator unit coupling portion 301 directly engages with the final drive driven gear Z' as shown in fig. 27.

The mode switching device 402 is provided to separate the three of the transmission unit 200, the wheels, and the first motor generator 302 so that any two of the three can work by bypassing the third. In addition, the problem that a common hybrid power transmission system needs complex gear shifting and a transmission chain to realize a pure electric working condition in speed change can be solved, and the plug-in hybrid power transmission system is particularly suitable for plug-in hybrid vehicles. Of course, the three can work simultaneously.

The vehicle powertrain 1000 has a plurality of operating modes, some of which are described in detail below.

The power transmission system 1000 of the vehicle has a parking power generation mode, the power transmission system 1000 of the vehicle is in the parking power generation mode, the power source 100 operates, the transmission unit 200 and the system power output part 401 are disconnected through the power coupling of the mode conversion device 402, the first motor generator unit 300 and the system power output part 401 are disconnected through the power coupling of the mode conversion device 402, the power output of the whole vehicle is interrupted, and the power output by the power source 100 drives the first motor generator unit 300 to generate power through the mode conversion device 402 to supplement the electric quantity for the system. In the embodiment where the mode switching device 402 includes the switching device input 4021 and the switching device output 4022, the power source 100 operates, the switching device input 4021 is disconnected from the switching device output 4022, the power output of the entire vehicle is interrupted, and the power source 100 is adapted to drive the first motor generator unit 300 through the switching device input 4021 to generate power to supplement the power to the system. Therefore, the parking power generation mode can be switched only through the mode conversion device 402 without adding an extra power transmission chain, the switching control is simple, and the transmission efficiency is high.

The parking power generation function of the power transmission system 1000 of the vehicle not only can supplement the charge amount for the power battery after feeding, ensure the reliable operation of electricity four-wheel drive and whole vehicle power utilization, can also realize the function of a mobile energy storage power station, the mobile energy storage power station can shift into a charger baby and a power station by increasing the parking power generation and reverse discharge functions, the vehicle can be turned into a 220V alternating current discharge function (VTOL) outside the vehicle, the power supply function (VTOG) of the vehicle to a power grid and the mutual charging function (VTOV) of the vehicle to the vehicle can be realized at any time, and the purposes of the vehicle are greatly enriched.

The power train 1000 of the vehicle has a power source drive mode, and when the power train 1000 of the vehicle is in the power source drive mode, the first motor generator unit 300 does not operate, the transmission unit 200 is connected to the power source 100 in a power coupling manner, the transmission unit 200 is connected to the system power output unit 401 in a power coupling manner via the mode conversion device 402, and the power output from the power source 100 is output to the system power output unit 401 via the transmission unit 200 and the mode conversion device 402 in this order. In the embodiment where the mode switching device 402 includes the switching device input 4021 and the switching device output 4022, the switching device input 4021 is in power coupling connection with the power source 100, the switching device input 4021 is engaged with the switching device output 4022, and the power output from the power source 100 is output to the system power output 401 through the switching device input 4021 and the switching device output 4022 in this order. That is, in the power source drive mode, the vehicle is driven by the power source 100.

The power transmission system 1000 of the vehicle has a pure electric drive mode, the power transmission system 1000 of the vehicle is in the pure electric drive mode, the power source 100 does not work, the first motor generator unit 300 is in power coupling connection with the system power output part 401 through the mode conversion device 402, and the power output by the first motor generator unit 300 is output to the system power output part 401 through the mode conversion device 402. That is, in the pure electric drive mode, the vehicle is driven by the first motor generator unit 300, the transmission efficiency of the power output from the first motor generator unit 300 is high, and the control strategy is easily implemented. In the embodiment in which the mode switching device 402 includes the switching device input portion 4021 and the switching device output portion 4022, the switching device input portion 4021 is connected to the first motor generator unit 300 by power coupling, the switching device input portion 4021 is connected to the switching device output portion 4022, and the power output by the first motor generator unit 300 passes through the switching device input portion 4021 and the switching device output portion 4022 in this order and is output to the system power output portion 401. That is, in the electric-only drive mode, the vehicle is driven by means of the first motor generator unit 300.

When the power transmission system 1000 of the vehicle is in the hybrid drive mode, the power source 100 and the first motor generator unit 300 both operate, the speed change unit 200 is connected to the power source 100 in a power coupling manner, the speed change unit 200 is connected to the system power output unit 401 in a power coupling manner through the mode switching device 402, the power output by the power source 100 is output to the system power output unit 401 through the speed change unit 200 and the mode switching device 402 in this order, the first motor generator unit 300 is connected to the system power output unit 401 in a power coupling manner through the mode switching device 402, and the power output by the first motor generator unit 300 is output to the system power output unit 401 through the mode switching device 402. In the embodiment where the mode switching device 402 includes the switching device input unit 4021 and the switching device output unit 4022, the switching device input unit 4021 is connected to the power source 100 and the first motor generator unit 300 in a power coupling manner, the switching device input unit 4021 is connected to the switching device output unit 4022, and both the power output from the power source 100 and the power output from the first motor generator unit 300 are output to the system power output unit 401 through the switching device input unit 4021 and the switching device output unit 4022 in this order. That is, in the hybrid driving mode, the vehicle is driven by both the power source 100 and the first motor generator unit 300, the outputs of the power source 100 and the first motor generator 302 are relatively independent, and the modification is small based on the conventional fuel vehicle powertrain, and even if one of the power source 100 and the first motor generator unit 300 fails to cause power interruption, the operation of the other will not be affected.

When the power transmission system 1000 of the vehicle is in the driving power generation mode, the power source 100 operates, the speed change unit 200 is in power coupling connection with the power source 100, the speed change unit 200 is in power coupling connection with the system power output unit 401 through the mode conversion device 402, a part of the power output by the power source 100 is output to the system power output unit 401 through the speed change unit 200 and the mode conversion device 402 in sequence, and the other part of the power output by the power source 100 is output to the first motor generator unit 300 through the speed change unit 200 and the mode conversion device 402 in sequence, so as to drive the first motor generator unit 300 to generate power. In the embodiment where the mode switching device 402 includes the switching device input unit 4021 and the switching device output unit 4022, the switching device input unit 4021 is connected to the power source 100 by power coupling, the switching device input unit 4021 is connected to the switching device output unit 4022, a part of the power output by the power source 100 passes through the switching device input unit 4021 and the switching device output unit 4022 in this order and is output to the system power output unit 401, and the other part of the power output by the power source 100 passes through the switching device input unit 4021 and is output to the first motor generator unit 300, thereby driving the first motor generator unit 300 to generate power.

When the power train 1000 of the vehicle is in the braking energy recovery mode, the first motor generator unit 300 and the system power output unit 401 are connected in a power coupling manner by the mode conversion device 402, and the power from the wheels of the vehicle drives the first motor generator unit 300 to generate power through the system power output unit 401 and the mode conversion device 402 in this order. However, in the embodiment in which the mode switching device 402 includes the switching device input portion 4021 and the switching device output portion 4022, the switching device input portion 4021 is engaged with the switching device output portion 4022, and power from the wheels of the vehicle drives the first motor generator unit 300 to generate power through the system power output portion 401 and the switching device input portion 4021 in this order. That is, in the braking energy recovery mode, the power of the wheels is partially dissipated by the braking system, and partially drives the first motor generator unit 300 to generate electricity, so that the power transmission system 1000 is more environmentally friendly.

According to the power transmission system 1000 of the embodiment of the invention, by arranging the mode conversion device 402 in the above structural form, the working modes of the power transmission system 1000 can be increased, and particularly, the application of the vehicle is greatly enriched in the parking power generation mode.

The foregoing advantages are all achieved by the mode converting device 402 and have a high degree of integration. Some alternative structural forms of the mode switching device 402 according to the embodiment of the present invention are described below.

Referring to fig. 4 and 20, in some alternative embodiments, the shifter input 4021 may be a final drive driven gear Z' that meshes with the final drive gear Z.

The shifter input 4021 may be a final drive driven gear Z ', the shifter output 4022 may be a shifter output shaft, and the final drive driven gear Z' is selectively engageable for synchronous rotation with the shifter output shaft. Alternatively, the final drive driven gear Z' may be freely sleeved on the half shaft 2000 of the vehicle, and the output shaft of the conversion device may be sleeved on the half shaft 2000 of the vehicle. Alternatively, the mode shift device 402 may further include a shift device synchronizer S, which may be fixedly disposed on one of the final drive driven gear Z 'and the shift device output shaft to selectively synchronize the final drive driven gear Z' and the shift device output shaft.

Referring to fig. 5-6 and 21-22 and 24-26, in further alternative embodiments, the shifter input 4021 may include a final drive gear Z ' engaged with the final drive gear Z, the final drive gear Z ' being adapted to output power from at least one of the power source 100 and the first motor generator unit 300, and a planetary gear mechanism P that may include a first element P1, a second element P2, and a third element P3, the first element P1 being fixed with the final drive gear Z ', the second element P2 being fixedly disposed, and the third element P3 being selectively synchronized with the shifter output 4022.

The first element P1 is a sun gear, the second element P2 is one of a carrier and a ring gear, and the third element P3 is the other of the carrier and the ring gear. For example, in the embodiment shown in fig. 5 and 21, the first element P1 is a sun gear, the second element P2 is a ring gear, and the third element P3 is a planet carrier; for example, in the embodiment shown in fig. 6, 22, and 24-26, the first element P1 is the sun gear, the second element P2 is the planet carrier, and the third element P3 is the ring gear.

Alternatively, the shifter output 4022 may be a shifter output shaft, with the final drive driven gear Z' and the third element P3 both idler on the vehicle half shafts 2000, and the shifter output shaft on the vehicle half shafts 2000. Specifically, referring to fig. 5, 6, 21 and 22, the final drive driven gear Z' and the sun gear may be of a double-cogged structure. The mode shift device 402 may further include a shift device synchronizer S fixedly disposed on one of the third element P3 and the shift device output shaft for selectively synchronizing the third element P3 with the shift device output shaft.

Referring to fig. 7 and 23, in yet another alternative embodiment, the shifter input 4021 is a final drive gear Z 'that meshes with the final drive gear Z, the shifter output 4022 includes a planetary gear set P including a first element P1, a second element P2, and a third element P3, the final drive gear Z' being selectively synchronized with the first element P1, the second element P2 being fixedly disposed, and the third element P3 being fixedly secured to the input 4011 of the system power output 401.

The first element P1 is a sun gear, the second element P2 is one of a carrier and a ring gear, and the third element P3 is the other of the carrier and the ring gear. For example, in the embodiment shown in fig. 7, the first element P1 is a sun gear, the second element P2 is a ring gear, and the third element P3 is a planet carrier.

Preferably, the mode switch output 4022 may further include a switch output shaft having one end fixed to the third element P3 and the other end fixed to the input 4011 of the system power output 401. The driven gear Z' of the main speed reducer and the first element P1 can be sleeved on a half shaft 2000 of the vehicle in a hollow mode, and the output shaft of the conversion device is sleeved on the half shaft 2000 of the vehicle. The mode shift device 402 may further include a shift device synchronizer S fixedly disposed on one of the first element P1 and the final drive driven gear Z 'to selectively synchronize the first element P1 and the final drive driven gear Z'.

Alternatively, referring to fig. 21-26, the planetary gear mechanism P may be hollow on the half shaft 2000 of the vehicle, so that the power train 1000 is more axially compact.

As shown in fig. 8 to 13, the system power output portion 401 may include two side gears, which correspond one-to-one to the two half shafts 2000 of the vehicle, and the power transmission system 1000 of the vehicle further includes: a power on-off device 500, the power on-off device 500 adapted to selectively engage at least one of the two side gears with a corresponding half shaft 2000 of the vehicle. It is understood that if the power switching device 500 is provided between the half shaft 2000 of one side and the corresponding side gear, the power switching device 500 may control the engagement off-state between the half shaft 2000 of the side and the side gear, and if the power switching devices 500 are provided between the half shafts 2000 of both sides and the corresponding side gear, respectively, each power switching device 500 may control the engagement off-state of the corresponding side. As shown in fig. 8 to 10 and 12, the power switching devices 500 are provided between the half shaft 2000 on the right side and the corresponding side gear, and as shown in fig. 11 and 13, the power switching devices 500 may be two, one power switching device 500 may be provided between the half shaft 2000 on the left side and the corresponding side gear, and the other power switching device 500 may be provided between the half shaft 2000 on the right side and the corresponding side gear.

There are various types of the power switching device 500, and for example, as shown in fig. 8 to 9, the power switching device 500 may be a clutch. Preferably, as shown in fig. 10 and 11, the clutch may be a dog clutch.

Of course, the power switching device 500 may also be of another type, for example, as shown in fig. 12 and 13, the power switching device 500 may be a synchronizer.

According to a preferred embodiment of the present invention, as shown in fig. 2, the power transmission system 1000 may further include a second motor generator 600, the second motor generator 600 being located between the power source 100 and the speed changing unit 200, one end of the second motor generator 600 being directly power-coupled to the power source 100, and the other end of the second motor generator 600 being selectively power-coupled to the speed changing unit 200.

As shown in fig. 2, the second motor generator 600 may be coaxially connected with the input end of the first clutch device L1. The second motor generator 600 may be provided between the input of the first clutch device L1 and the engine so that the power of the engine is necessarily transmitted to the input through the second motor generator 600, and the second motor generator 600 may be used as a generator to perform parking power generation.

Of course, the second motor generator 600 and the first clutch device L1 may be disposed in parallel, a motor shaft of the second motor generator 600 may be connected to a first transmission gear, and a second transmission gear may be disposed on an input end of the first clutch device L1, the first transmission gear being engaged with the second transmission gear. Thus, the power of the engine can be transmitted to the second motor generator 600 through the first and second transmission gears, so that the second motor generator 600 can be used as a generator for generating electricity for parking.

According to another preferred embodiment of the present invention, as shown in fig. 3, the power transmission system 1000 may further include: and a second motor generator 600, the second motor generator 600 being located between the power source 100 and the transmission unit 200, one end of the second motor generator 600 being selectively in power coupling connection with the power source 100, and the other end of the second motor generator 600 being selectively in power coupling connection with the transmission unit 200.

As shown in fig. 3, a second clutch device L2 may be provided between the second motor generator 600 and the engine. The second clutch device L2 may be a single clutch that can control the disconnection of the engagement between the engine and the second motor generator 600, and can control the disconnection of the engagement between the engine and the input terminal. By providing the second clutch device L2, the parking power generation state of the second motor generator 600 can be controlled reasonably, so that the power transmission system 1000 can be made simple in structure and the drive mode switching is reliable.

Preferably, the second clutch device L2 may be built in the rotor of the second motor generator 600. This can shorten the axial length of the power transmission system 1000 better, so that the volume of the power transmission system 1000 can be reduced, and the flexibility of the arrangement of the power transmission system 1000 on the vehicle can be improved. In addition, second motor generator 600 may also be used as a starter.

Preferably, the power source 100, the second clutch device L2, and the input of the dual clutch 202 are coaxially arranged. This allows the powertrain 1000 to be compact and small.

It should be noted that, for the power transmission system 1000 of the above several embodiments, in the axial direction, the second motor generators 600 may be both located between the power source 100 and the first clutch device L1, so that the axial length of the power transmission system 1000 may be effectively reduced, the location of the second motor generators 600 may be reasonable, and the structural compactness of the power transmission system 1000 may be improved.

In the embodiment where the power train system 1000 has the second motor generator 600, the first motor generator 302 may be the main driving motor of the power train system 1000, so the capacity and volume of the first motor generator 302 are relatively large, and the rated power of the first motor generator 302 is larger than that of the second motor generator 600 for the first motor generator 302 and the second motor generator 600. In this way, the second motor generator 600 can be selected from motor generators having small volume and small rated power, so that the power transmission system 1000 has a simple structure and small volume, and when the parking power generation is performed, the transmission path between the second motor generator 600 and the power source 100 is short, the power generation efficiency is high, and a part of power of the power source 100 can be effectively converted into electric energy. Wherein the peak power of the first motor generator 302 is also larger than the peak power of the second motor generator 600.

Preferably, the rated power of the first motor generator 302 may be twice or more than the rated power of the second motor generator 600. The peak power of the first motor generator 302 may be twice or more than the peak power of the second motor generator 600. For example, the rated power of the first motor generator 302 may be 60kw, the rated power of the second motor generator 600 may be 24kw, the peak power of the first motor generator 302 may be 120kw, and the peak power of the second motor generator 600 may be 44 kw.

It should be noted that the system power output 401 may be a conventional open differential, such as, but not limited to, a bevel gear differential or a cylindrical gear differential; of course, the differential 401 may also be a locking differential, such as a mechanical locking differential, an electronic locking differential, etc., and the power transmission system 1000 selects different differential types according to different vehicle types, such selection mainly being based on the cost of the whole vehicle, the weight reduction of the whole vehicle, the off-road performance of the whole vehicle, etc.

In the embodiment where the power transmission system 1000 has the second motor generator 600, the power transmission system 1000 of the vehicle also has a plurality of operation modes accordingly.

The power transmission system 1000 of the vehicle may further have a first power generation mode, when the power transmission system 1000 of the vehicle is in the first power generation mode, the power source 100 operates, the speed change unit 200 is in power coupling connection with the power source 100, the second motor generator 600 is in power coupling connection with the power source 100, the speed change unit 200 is in power coupling connection with the system power output unit 401 through the mode conversion device 402, a first part of power output by the power source 100 is output to the system power output unit 401 through the speed change unit 200 and the mode conversion device 402 in sequence, a second part of power output by the power source 100 is output to the first motor generator unit 300 through the speed change unit 200 and the mode conversion device 402 in sequence, the first motor generator unit 300 is driven to generate power, and a third part of power output by the power source 100 directly drives the second motor generator 600 to generate power. In this way, in the third-row vehicle power generation mode, the first motor generator unit 300 and the second motor generator 600 generate electric power simultaneously, and the generated electric power is large.

The vehicle powertrain 1000 may further have a second driving power generation mode, when the vehicle powertrain 1000 is in the second driving power generation mode, the power source 100 operates, the transmission unit 200 is in power coupling connection with the power source 100, the second motor generator 600 is in power coupling connection with the power source 100, the transmission unit 200 is in power coupling connection with the system power output unit 401 through the mode switching device 402, a first part of power output by the power source 100 is output to the system power output unit 401 through the transmission unit 200 and the mode switching device 402 in sequence, and a second part of power output by the power source 100 directly drives the second motor generator 600 to generate power. Since the transmission path of second motor generator 600 to power source 100 is short, the efficiency of power generation is high.

The power transmission system 1000 of the vehicle may further have a first parking power generation mode, when the power transmission system 1000 of the vehicle is in the first parking power generation mode, the power source 100 operates, the second motor generator 600 is in power coupling connection with the power source 100, the transmission unit 200 is disconnected from the system power output portion 401 through the mode conversion device 402, the first motor generator unit 300 is disconnected from the system power output portion 401 through the mode conversion device 402, the power output of the entire vehicle is interrupted, the power output from the power source 100 drives the first motor generator unit 300 to generate power through the mode conversion device 402, and a second part of the power output from the power source 100 directly drives the second motor generator 600 to generate power. Thus, the power generated is large.

The power transmission system 1000 of the vehicle may further have a second parking power generation mode, when the power transmission system 1000 of the vehicle is in the second parking power generation mode, the power source 100 is operated, the second motor generator 600 is in power coupling connection with the power source 100, the transmission unit 200 is in power coupling disconnection with the system power output portion 401 through the mode switching device 402, and the first motor generator unit 300 is in power coupling disconnection with the system power output portion 401 through the mode switching device 402, and the power output by the power source 100 directly drives the second motor generator 600 to generate power. Since the transmission path of second motor generator 600 to power source 100 is short, the efficiency of power generation is high.

When second motor generator 600 is selectively coupled to engine 100, power train 1000 of the vehicle has a first braking energy recovery mode, and when power train 1000 of the vehicle is in the first braking energy recovery mode, second motor generator 600 is coupled to system power output unit 401 through mode conversion device 402, and power from the wheels of the vehicle drives second motor generator 600 to generate power through system power output unit 401 and mode conversion device 402 in this order. In the embodiment in which mode switching device 402 includes switching device input unit 4021 and switching device output unit 4022, switching device input unit 4021 is engaged with switching device output unit 4022, and power from the wheels of the vehicle drives second motor generator 600 to generate electric power via system power output unit 401 and switching device input unit 4021 in this order. That is, in the braking energy recovery mode, a part of the power of the wheels is dissipated by the brake system, and a part of the power can drive the second motor generator 600 to generate electricity, so that the power transmission system 1000 is more environmentally friendly.

In some preferred embodiments of the present invention, the power source 100 may be an engine, the vehicle powertrain 1000 may further have a quick start mode, and when the vehicle powertrain 1000 is in the quick start mode, the second motor generator 600 is coupled to the engine power, and the power output by the second motor generator 600 directly drives the engine to start. Therefore, the starting time of the engine can be shortened, and the quick starting can be realized.

Preferably, the power transmitted by the power transmission system 1000 is output to two wheels of the vehicle through the system power output part 401, but the power transmission system 1000 is not limited thereto, and referring to fig. 14 to 19, the power transmission system 1000 may further include an electric drive system 700, and the electric drive system 700 may be used to drive the other two wheels of the vehicle, so that four-wheel drive of the vehicle may be realized.

Various arrangements of electric drive system 700 in accordance with embodiments of the present invention are described in detail below.

Electric drive system 700 may include a drive system input and a drive system output adapted to output power from the drive system input to two other wheels, such as the rear wheels.

For example, as shown in fig. 14, the electric drive system 700 further includes an electric drive system power output 710 adapted to output power from the drive system input to the other two wheels through the electric drive system power output 710. The electric drive system power output 710 may facilitate distribution of power transmitted from the drive system output to both wheels on both sides, so that the vehicle may be driven smoothly.

Specifically, the drive system input may be a drive motor generator 720 and the drive system output is a gear reducer 730. Thus, when the driving motor generator 720 is operated, the power generated by the driving motor generator 720 can be transmitted to the electric driving system power output part 710 after being decelerated and torque-increased by the gear reducer 730, and the electric driving system power output part 710 can distribute the power transmitted from the driving system output part to the two wheels on both sides, so that the vehicle can be smoothly driven.

As another example, referring to fig. 15-18, the drive-system input includes two drive motor-generators 720, and the drive-system output includes two drive-system sub-outputs, each adapted to output power from a corresponding drive motor-generator 720 to a corresponding one of the other two wheels. That is, one driving motor generator 720 and one driving system sub-output are provided for each wheel, so that the electric driving system power output 710 can be omitted, and the two driving motor generators 720 can adjust their rotation speeds to achieve a differential speed between the two wheels, thereby making the power transmission system 1000 simple and reliable in structure.

As shown in fig. 15, the other two wheels are selectively synchronized. For example, one of the axle shafts 2000 may be provided with an axle shaft synchronizer adapted to selectively engage the other axle shaft 2000. Therefore, the two wheels can rotate in the same direction and at the same speed, and differential motion of the two wheels can be realized, so that the running stability of the vehicle can be ensured.

As shown in fig. 16, the two drive motor generators 720 are selectively synchronized. For example, a motor output shaft synchronizer may be disposed on one motor output shaft 721 to selectively engage the other motor output shaft 721, so that the two wheels can rotate at the same speed in the same direction, and the two wheels can move at different speeds, thereby ensuring the driving stability of the vehicle.

As shown in fig. 17 and 18, the two drive system sub-outputs are selectively synchronized. That is to say, one of the sub-output parts of the two driving systems can be provided with a sub-output part synchronizer for synchronizing the sub-output part of the other driving system, so that the co-directional and co-speed rotation of the two wheels can be realized, and the differential motion of the two wheels can also be realized, thereby ensuring the running stability of the vehicle.

As shown in fig. 17-18, the drive system sub-output may include a two-stage gear reduction unit 730, and the power of the drive motor generator 720 subjected to the two-stage reduction may be transmitted to the wheels to drive the wheels to rotate.

Or the drive system sub-output may include a two speed transmission. The drive motor generator 720 is selectively engaged in one of the gears, and the rotational speed of the output of the drive motor generator 720 to the wheels can be changed by providing the second-gear transmission, so that the drive mode of the power transmission system 1000 can be enriched, and the economy and the drivability of the vehicle can be improved.

Specifically, the driving motor generator 720 may include a motor output shaft 721, and the secondary gear reducer 730 or the secondary transmission may each include a driving system sub-output input shaft that is fixedly connected to and coaxially disposed with the motor output shaft 721. This drives motor generator 720 to transmit power through motor output shaft 721 to the drive system sub-output input shaft, and then to the wheels through the drive system sub-output to drive the vehicle in motion.

As another example, as shown in fig. 19, electric drive system 700 may include two wheel-side motors, each of which directly drives a corresponding one of the other two wheels, with the other two wheels being selectively synchronized. One of the half shafts 2000 may be provided with a half shaft synchronizer to selectively engage the other half shaft 2000, so that the wheel-side motors may drive the corresponding wheels to rotate, respectively, and by turning off the half shaft synchronizer, differential motion of the two wheels may be achieved, thereby ensuring the traveling stability of the vehicle.

In one specific embodiment of the present invention, referring to fig. 20 to 23, a power train system of a vehicle includes: a power source 100; a dual clutch 202, the dual clutch 202 having an input, a first output and a second output, the output of the power source 100 being connected to the input of the dual clutch; the driving mechanism comprises a first input shaft I and a second input shaft II, wherein the first input shaft I is connected with a first output end, the second input shaft II is connected with a second output end, the second input shaft II is coaxially sleeved on the first input shaft I, and at least one driving gear is fixedly arranged on the first input shaft I and the second input shaft II respectively; the first output shaft III and the second output shaft IV are respectively sleeved with at least one driven gear in an idle mode, one of the first output shaft III and the second output shaft IV is sleeved with a reverse gear driven gear Rb in an idle mode, the at least one driven gear is correspondingly meshed with the at least one driving gear, and the driven gear and the reverse gear driven gear Rb are selectively jointed with the corresponding output shafts; the reverse gear transmission device comprises a reverse gear intermediate shaft V, wherein a first reverse gear intermediate gear Rm1 and a second reverse gear intermediate gear Rm2 are fixedly arranged on the reverse gear intermediate shaft V, the first reverse gear intermediate gear Rm1 is meshed with one of at least one driving gear, and the second reverse gear intermediate gear Rm2 is meshed with a reverse gear driven gear Rb; a first motor generator 302; the three main reducer driving gears Z comprise a motor output gear, a first output gear fixedly arranged on a first output shaft III and a second output gear fixedly arranged on a second output shaft IV, and the motor output gear is in power coupling connection with the first motor generator 302; a main reducer driven gear Z' meshed with each main reducer driving gear Z; a system power output part 401, a main reducer driven gear Z 'selectively connected to an input 4011 of the system power output part 401, when the main reducer driven gear Z' is disconnected from the input 4011 of the system power output part 401, the power output from the power source 100 sequentially passes through one of the first output gear and the second output gear, the main reducer driven gear Z ', the motor output gear to drive the first motor generator 302 to generate power, and the system power output part 401 is adapted to output the power from the main reducer driven gear Z' to the two front wheels; and the rear wheel motor generator drives two rear wheels through a speed reducing mechanism.

In another specific embodiment of the present invention, referring to fig. 24 to 26, a power train system of a vehicle includes: a power source 100; a dual clutch 202 having an input, a first output and a second output, the output of the power source 100 being connected to the input of the dual clutch 202; the transmission device comprises a first input shaft I and a second input shaft II, wherein the first input shaft I is connected with a first output end, the second input shaft II is connected with a second output end, the second input shaft II is coaxially sleeved on the first input shaft I, at least one first driving gear is fixedly arranged on the first input shaft I and the second input shaft II respectively, at least one second driving gear is sleeved on the first input shaft I in an empty mode respectively, a reverse gear driving gear Ra is fixedly arranged on one of the second input shaft II and the first input shaft I, and the at least one second driving gear is selectively jointed with the corresponding input shaft; the power output shaft III ' is sleeved with a reverse gear driven gear Rb and at least one first driven gear in an idle mode, the at least one first driven gear is correspondingly meshed with the at least one first driving gear, the power output shaft III ' is fixedly provided with at least one second driven gear, the at least one second driven gear is correspondingly meshed with the at least one second driving gear, and the reverse gear driven gear Rb and the at least one first driven gear are selectively jointed with the power output shaft III '; the reverse gear middle shaft V is fixedly provided with an idler gear IG, and the idler gear IG is meshed with a reverse gear driving gear Ra and is meshed with a reverse gear driven gear Rb; the first motor generator 302, the first motor generator 302 is in power coupling connection with the power output shaft III'; a main reducer driving gear Z which is fixedly arranged on a power output shaft III'; a main reducer driven gear Z' meshed with the main reducer driving gear Z; a system power output section 401 in which a main reducer driven gear Z 'is selectively connected to an input port 4011 of the system power output section 401, and when the main reducer driven gear Z' is disconnected from the input port 4011 of the system power output section 401, power output from the power source 100 sequentially passes through the main reducer driving gear Z and the main reducer driven gear Z 'to drive the first motor generator 302 to generate power, the system power output section 401 being adapted to output the power from the main reducer driven gear Z' to the two front wheels; and the rear wheel motor generator drives two rear wheels through a speed reducing mechanism.

In summary, according to the power transmission system 1000 of the vehicle of the present invention, the mode conversion device 402 can enrich the driving modes of the vehicle, improve the economy and the power performance of the vehicle, adapt to different road conditions, significantly improve the trafficability and the ability to escape from the vehicle, and improve the driving experience of the driver. And the power transmission system 1000 can realize the parking power generation function, which not only ensures direct power transmission and high transmission efficiency when the first motor generator unit 300 is driven and fed back, but also ensures simple and reliable switching of the parking power generation mode. Meanwhile, since the power of the engine and the power of the first motor generator unit 300 are coupled at the mode conversion device 402, the transmission unit applied to the engine can completely adopt the transmission of the original conventional fuel vehicle without any modification, and the power output of the first motor generator unit 300 is completely realized by the switching of the mode conversion device 402. Due to the design of the power transmission system 1000, the control of each driving mode is relatively independent, the structure is compact, and the realization is easy.

The invention also discloses a vehicle, which comprises the power transmission system 1000 of any embodiment.

In the description of the present invention, it is to be understood that the terms "central", "longitudinal", "lateral", "front", "rear", "left", "right", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A powertrain system for a vehicle, comprising:

a power source;

a first motor generator unit;

a system power output;

a mode conversion device comprising a conversion device input and a conversion device output, the conversion device input is selectively in power coupling connection with the power source, the conversion device input is in power coupling connection with the first motor generator unit, the output part of the conversion device is fixedly arranged on the shell of the power output part of the system, the input part of the conversion device is selectively jointed with the output part of the conversion device, the power source is adapted to drive the first motor generator unit to generate power through the conversion device input when the conversion device input is disconnected from the conversion device output, the conversion device input portion comprises a main reducer driven gear, the conversion device output portion comprises a conversion device output shaft, said final drive driven gear selectively engaging said conversion device output shaft for synchronous rotation;

a speed change unit in selective power coupling connection with the power source, the speed change unit in power coupling connection with the conversion device input so as to output power from the power source to the conversion device input through the speed change unit.

2. The vehicle driveline according to claim 1, wherein the final drive driven gear is idly sleeved on a half shaft of the vehicle, and the conversion device output shaft is sleeved on the half shaft of the vehicle.

3. The vehicle powertrain system of claim 1, wherein the mode shift device further includes a shift device synchronizer fixedly disposed on one of the final drive driven gear and the shift device output shaft to selectively synchronize the final drive driven gear and the shift device output shaft.

4. The vehicle powertrain system of claim 1, wherein the mode shift device input includes the final drive driven gear and a planetary gear mechanism including a first element fixed with the final drive driven gear, a second element fixedly disposed, and a third element selectively synchronized with the shift device output, the first element being a sun gear, the second element being one of a carrier and a ring gear, and the third element being the other of the carrier and the ring gear.

5. The vehicle driveline of claim 4, wherein the final drive driven gear and the third element are both hollow on a half shaft of the vehicle, and the transition device output shaft is sleeved on the half shaft of the vehicle.

6. The vehicle powertrain system of claim 5, wherein the final drive driven gear and the sun gear are of a double tooth configuration.

7. The vehicle powertrain system of claim 5, wherein the mode shift device further includes a shift device synchronizer fixedly disposed on one of the third element and the shift device output shaft to selectively synchronize the third element and the shift device output shaft.

8. The vehicle powertrain system of claim 1, wherein the shifter input is a final drive driven gear, the shifter output further includes a planetary gear mechanism including a first element, a second element and a third element, the final drive driven gear being selectively synchronized with the first element, the second element being fixedly disposed, one end of the shifter output shaft being fixed with the third element, the other end of the shifter output shaft being fixed with a housing of the system power output, the first element being a sun gear, the second element being one of a carrier and a ring gear, the third element being the other of the carrier and the ring gear.

9. The vehicle driveline according to claim 8, wherein the final drive driven gear and the first element are both freely sleeved on a half shaft of the vehicle, and the converter output shaft is sleeved on the half shaft of the vehicle.

10. The vehicle driveline of claim 9, wherein the mode shift device further comprises a shift device synchronizer fixedly disposed on one of the first element and the final drive driven gear to selectively synchronize the first element and the final drive driven gear.

11. The vehicle driveline of claim 1, wherein the transmission unit and the first motor generator unit each include a final drive gear that meshes with the final drive driven gear to power couple the transmission unit with the converter input and to power couple the first motor generator unit with the converter input.

12. The vehicular power transmission system according to claim 1, characterized in that the speed change unit comprises:

a variable speed power input selectively engageable with the power source to transmit power generated by the power source;

a speed change power output portion;

a transmission unit output, wherein the transmission power output is configured and adapted to output power from the transmission power input to the transmission unit output via synchronization of a transmission unit synchronizer, the transmission unit output being in power coupling connection with the conversion device input.

13. The vehicle driveline of claim 1, wherein the first motor generator unit includes a first motor generator and a first motor generator unit coupling, the first motor generator being in power coupling connection with the first motor generator unit coupling, the first motor generator unit coupling being in power coupling connection with the conversion device input.

14. The vehicle powertrain system according to claim 1, wherein the vehicle powertrain system has a power source drive mode, and wherein the first motor generator unit is not operated when the vehicle powertrain system is in the power source drive mode, wherein the conversion device input portion is in power coupling connection with the power source, wherein the conversion device input portion is engaged with the conversion device output portion, and wherein the power output by the power source is output to the system power output portion via the conversion device input portion and the conversion device output portion in this order.

15. The vehicle powertrain system of claim 1, wherein the vehicle powertrain system has an electric-only drive mode, the vehicle powertrain system is in the electric-only drive mode, the power source is inactive, the inverter input is engaged with the inverter output, and the power output from the first motor generator unit is output to the system power output via the inverter input and the inverter output in this order.

16. The vehicle powertrain system according to claim 1, wherein the vehicle powertrain system has a hybrid drive mode, and when the vehicle powertrain system is in the hybrid drive mode, the power source and the first motor generator unit are both operated, the conversion device input portion is in power coupling connection with the power source, the conversion device input portion is engaged with the conversion device output portion, and both the power output from the power source and the power output from the first motor generator unit are output to the system power output portion via the conversion device input portion and the conversion device output portion in this order.

17. The vehicle powertrain system of claim 1, wherein the vehicle powertrain system has a driving power generation mode, and when the vehicle is in the driving power generation mode, the power source operates, the converter input is in power coupling connection with the power source, the converter input is engaged with the converter output, a part of the power output from the power source is output to the system power output through the converter input and the converter output in sequence, and another part of the power output from the power source is output to the first motor generator unit through the converter input to drive the first motor generator unit to generate power.

18. The vehicle powertrain system of claim 1, wherein the vehicle powertrain system has a regenerative braking mode, wherein the converter input is engaged with the converter output when the vehicle is in the regenerative braking mode, and wherein power from the vehicle wheels, in turn, drives the first motor generator unit to generate electricity via the system power output and the converter input.

19. A vehicle characterized by comprising a powertrain of a vehicle according to any one of claims 1-18.