A power transmission system and a vehicle having the same

Abstract

The present invention discloses a power transmission system and a vehicle having the same. The power transmission system includes: an engine, a first electric generator, a second electric generator, a first input shaft, a second input shaft, a first intermediate mechanism, a second intermediate mechanism, an intermediate shaft and an output shaft. The first input shaft is respectively in power connection with the engine and the first electric generator; the second input shaft is in power connection with the second electric generator; the first intermediate mechanism is selectively engageable with the first input shaft and is linked with the second input shaft; the second intermediate mechanism is linked with the first input shaft; the intermediate shaft is linked with the first intermediate mechanism and is selectively linked with the first input shaft; the output shaft is selectively linked with the intermediate shaft and / or the second intermediate mechanism and / or the first input shaft; wherein the first input shaft and the output shaft are coaxially arranged, and the second intermediate mechanism and the intermediate shaft are arranged at intervals in the circumferential direction of the first input shaft. The power transmission system realizes respective gearshifts without power interruption under various working conditions through four different transmission paths, has a compact structure, a reasonable layout, and a low cost of the power transmission system.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive transmissions, and more particularly to a power transmission system and a vehicle having the same. Background Art

[0002] In the related art, with the development of the hybrid technology, the application fields of the hybrid technology are gradually increasing. Although the hybrid technology applied to sedans is relatively mature, the load of sedans is light, and the gear positions of the transmission systems applied to sedans cannot be adapted to heavy-duty vehicles. In particular, for the hybrid power transmission system applied to commercial vehicles, there is a situation of power interruption during gear shifting. The occurrence of power interruption in heavy-duty vehicles will seriously affect the driving performance and safety of the vehicles. Therefore, in the context of the hybrid technology, developing a power transmission system suitable for heavy-duty vehicles and solving the power interruption during gear shifting at the same time has become a technical problem in this field. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, an object of the present invention is to provide a power transmission system. The power transmission system realizes gear shifting without power interruption under various working conditions through four different transmission paths, has a compact structure, a reasonable layout, and a low cost of the power transmission system.

[0004] The present invention also provides a vehicle having the above power transmission system.

[0005] The power transmission system according to the present invention includes: an engine, a first motor-generator, and a second motor-generator; a first input shaft, the first input shaft is respectively in power connection with the engine and the first motor-generator; a second input shaft, the second input shaft is in power connection with the second motor-generator; a first transfer mechanism, the first transfer mechanism is selectively engageable with the first input shaft and is linked with the second input shaft; a second transfer mechanism, the second transfer mechanism is linked with the first input shaft; an intermediate shaft, the intermediate shaft is linked with the first transfer mechanism and is selectively linked with the first input shaft; an output shaft, the output shaft is selectively linked with the intermediate shaft and / or the second transfer mechanism and / or the first input shaft; wherein the first input shaft and the output shaft are coaxially arranged, and the second transfer mechanism and the intermediate shaft are circumferentially spaced apart from the first input shaft.

[0006] According to the powertrain of the present invention, by providing a first transfer mechanism, a second transfer mechanism, and an intermediate shaft, various different operating conditions of a series-parallel hybrid of three power sources can be achieved. Four power transmission paths are constructed in the powertrain. During the gear shifting process of the powertrain, by switching between the four power transmission paths, power interruption during gear shifting of the powertrain is achieved. Using a transmission system with a simple structure improves the smoothness of the powertrain, reduces the cost of the powertrain, and reduces the sense of jerk during driving.

[0007] According to some embodiments of the present invention, the first transfer mechanism is configured as a first double gear sleeved on the outer periphery of the first input shaft; a second input shaft gear is provided on the second input shaft, and a first double input gear meshing with the second input shaft gear is provided on the first double gear; an intermediate shaft first input gear is provided on the intermediate shaft, and a first double output gear meshing with the intermediate shaft first input gear is provided on the first double gear.

[0008] According to some embodiments of the present invention, the second transfer mechanism is configured as one or more second intermediate shafts. Each second intermediate shaft is provided with a second transfer input gear and a second transfer output gear. The second intermediate shaft is disposed parallel and offset in the circumferential direction of the first input shaft and the output shaft with respect to the intermediate shaft. A first input shaft first output gear meshing with the second transfer input gear is provided on the first input shaft, and the second transfer input gear meshes with the first input shaft first output gear; an output shaft first input gear selectively linkable with the output shaft is provided on the output shaft, and the output shaft first input gear meshes with the second transfer output gear.

[0009] According to some embodiments of the present invention, a first input shaft second output gear is sleeved on the first input shaft, and an intermediate shaft second input gear meshing with the first input shaft second output gear is provided on the intermediate shaft; further comprising: a first shifting device disposed on the first input shaft and selectively engaging the first input shaft with the first double gear or the first input shaft second output gear.

[0010] According to some embodiments of the present invention, a second shifting device is provided on the output shaft, and the second shifting device selectively engages the output shaft with the first input shaft or the output shaft first input gear with the output shaft.

[0011] According to some embodiments of the present invention, a plurality of intermediate shaft output gears are provided on the intermediate shaft, a plurality of output shaft second input gears meshing with the intermediate shaft output gears one by one are sleeved on the output shaft, and the output shaft selectively engages with one of the output shaft second input gears.

[0012] According to some embodiments of the present invention, the power transmission system further includes: a third shifting device disposed on the output shaft and selectively engaging one of the plurality of second input gears of the output shaft with the output shaft.

[0013] According to some embodiments of the present invention, the intermediate shaft is configured as one or more, each of the intermediate shafts is respectively linked with the first transfer mechanism, and a plurality of intermediate shaft output gears are disposed on each of the intermediate shafts.

[0014] According to some embodiments of the present invention, a clutch is disposed between the engine output shaft of the engine and the first input shaft to selectively engage the engine output shaft and the first input shaft.

[0015] The vehicle according to another aspect embodiment of the present invention will be briefly described below.

[0016] The vehicle according to the present invention applies the power transmission system of the above embodiments. Therefore, the vehicle can be a hybrid heavy-duty vehicle, which has multiple gears to be suitable for different loads, effectively reducing fuel consumption. At the same time, when the vehicle is shifting gears, power interruption can be avoided, the power switch is smoother, and the comfort and power performance of the vehicle are good.

[0017] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0019] Figure 1 is a schematic structural diagram of a power transmission system according to a specific embodiment of the present invention.

[0020] Figure 2 is a schematic structural diagram of a power transmission system including a secondary transmission according to a specific embodiment of the present invention.

[0021] Figure 3 is a schematic structural diagram of a single intermediate shaft power transmission system according to a specific embodiment of the present invention.

[0022] Figure 4 is a schematic structural diagram of a single intermediate shaft power transmission system including a secondary transmission according to a specific embodiment of the present invention.

[0023] Figure 5 is a schematic structural diagram of a power transmission system with a single intermediate shaft according to another specific embodiment of the present invention.

[0024] Figure 6 It is a schematic structural diagram of a single intermediate shaft power transmission system including a secondary transmission according to another specific embodiment of the present invention.

[0025] Reference numerals:

[0026] Engine 1; engine output shaft 70; first electric generator 2; second electric generator 3; clutch 4;

[0027] First input shaft 10; first output gear 11 of the first input shaft; second output gear 12 of the first input shaft;

[0028] Second input shaft 20; gear 21 of the second input shaft;

[0029] Intermediate shaft 30; first input gear 31 of the intermediate shaft; first intermediate shaft output gear 32a; second intermediate shaft output gear 32b; second input gear 33 of the intermediate shaft;

[0030] Output shaft 40; first input gear 41 of the output shaft; first second input gear 42a of the output shaft; second second input gear 42b of the output shaft;

[0031] Second intermediate rotating shaft 10a; second intermediate input gear 10b; second intermediate output gear 10c;

[0032] First double gear 20a; first double input gear 20b; first double output gear 20c;

[0033] First shifting device k1; second shifting device k2; third shifting device k3;

[0034] Third input shaft 40a; third input shaft output gear 61; secondary transmission shifting mechanism k4;

[0035] Secondary transmission intermediate shaft 50; secondary transmission intermediate shaft input gear 50a; secondary transmission intermediate shaft output gear 50b;

[0036] Secondary transmission output shaft 60; secondary transmission output shaft input gear 62. Detailed implementation manners

[0037] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0038] Below with reference to Figures 1-6Describe a power transmission system according to an embodiment of the present invention, including: an engine 1, a first motor generator 2, and a second motor generator 3. A first input shaft 10 is respectively power-connected to the engine 1 and the first motor generator 2, and a second input shaft 20 is power-connected to the second motor generator 3; a first transfer mechanism is selectively engaged with the first input shaft 10 and is linked to the second input shaft 20, a second transfer mechanism is linked to the first input shaft 10, an intermediate shaft 30 is linked to the first transfer mechanism and is selectively linked to the first input shaft 10, and an output shaft 40 is selectively linked to the intermediate shaft 30 and / or the second transfer mechanism and / or the first input shaft 10; the first input shaft 10 and the output shaft 40 are coaxially arranged, and the second transfer mechanism and the intermediate shaft 30 are circumferentially spaced apart from the first input shaft 10.

[0039] In the related art, with the development of the hybrid technology, the fields where the hybrid technology can be applied are gradually increasing. Although the hybrid technology applied to cars is relatively mature, the load of cars is light, and the gear positions of the transmission systems applied to cars cannot be adapted to heavy-duty vehicles. In particular, for the hybrid power transmission system applied to commercial vehicles, there is a situation of power interruption during gear shifting. Power interruption in heavy-duty vehicles will seriously affect the driving performance and safety of the vehicles. Therefore, in the context of the hybrid technology, developing a power transmission system suitable for heavy-duty vehicles and at the same time solving the power interruption during the gear shifting process has become a technical problem in this field.

[0040] In this application, there are four transmission paths in the power transmission system.

[0041] The first path: The engine 1 and / or the first motor generator 2 and / or the second motor generator 3 serve as power sources. The first input shaft 10 is linked to the second transfer mechanism, and the output shaft 40 is selected to be linked to the second transfer mechanism, so that the power of the engine 1 and / or the first motor generator 2 and / or the second motor generator 3 can be output through the first input shaft 10, the second transfer mechanism, and the output shaft 40.

[0042] The second path: The engine 1 and / or the first motor generator 2 and / or the second motor generator 3 serve as power sources. The first input shaft 10 is selected to be connected to a first double gear 20a, the second input shaft 20 is linked to the first transfer mechanism and the first input shaft 10, the first transfer mechanism is linked to the intermediate shaft 30, and the output shaft 40 is selected to be linked to the intermediate shaft 30 to achieve the output of power.

[0043] The third path: The engine 1 and / or the first motor generator 2 serve as power sources. The first input shaft 20 is selected to be connected to a first input shaft second output gear 12, the first input shaft 10 is linked to the intermediate shaft 30, and the output shaft 40 is selected to be linked to the intermediate shaft 30 to achieve the output of power.

[0044] Article 4: The engine 1 and / or the first electric generator 2 and / or the second electric generator 3 serve as power sources, and the output shaft 40 is directly selected to be linked with the first input shaft 10 to achieve power output.

[0045] In the above four power transmission paths, each power transmission path can correspond to multiple gears. For example, the first power transmission path has the third gear of the power transmission system, the second power transmission path has the first and fourth gears of the power transmission system, the third power transmission path has the second and fifth gears of the power transmission system, and the fourth power transmission path has the sixth gear of the power transmission system. Since the power transmission paths are different and the power sources are different, when switching between two adjacent gears, there will be no mutual interference between different power transmission paths. When shifting gears, since the two power transmission paths do not interfere with each other, power interruption during gear shifting is avoided, comfort is improved, and the sense of jerk during driving is reduced.

[0046] According to the power transmission system of the present invention, during the shift control of the engine 1 and / or the first electric generator 2, the second electric generator 3 can maintain power transmission in the second power transmission path, and is transmitted to the output shaft 40 through the second input shaft 20, the first intermediate mechanism, and the intermediate shaft 30, maintaining the power output of the second electric generator 3 in the first or fourth gear, while the power of the engine 1 and / or the first electric generator 2 can be switched between the four power transmission paths without power interruption, thereby realizing power interruption-free switching of different gear shifts.

[0047] According to the power transmission system of the present invention, by setting the first intermediate mechanism, the second intermediate mechanism, and the intermediate shaft 30, various different operating conditions of the hybrid power of three power sources can be realized in a series-parallel hybrid manner. Four power transmission paths are constructed in the power transmission system. During the gear shifting process of the power transmission system, by using the switching between the four power transmission paths, power interruption during gear shifting of the power transmission system is realized, and the smoothness of power transmission is improved by applying a power transmission system with a simple structure, reducing the sense of jerk during driving.

[0048] According to an embodiment of the present invention, such as Figures 1-4As shown in the figure, the first transfer mechanism is configured as a first double gear 20a sleeved on the outer periphery of the first input shaft 10. A second input shaft gear 21 is provided on the second input shaft 20, and a first double input gear 20b meshing with the second input shaft gear 21 is provided on the first double gear 20a. A first intermediate shaft input gear 31 is provided on the intermediate shaft 30, and a first double output gear 20c meshing with the first intermediate shaft input gear 31 is provided on the first double gear 20a. By configuring the first transfer mechanism as the first double gear 20a and simultaneously providing the first double input gear 20b and the first double output gear 20c, the linkage between the second input shaft 20 and the intermediate shaft 30 can be achieved. By sleeving the first double gear 20a on the first input shaft 10, the mutual interference between the first double gear 20a and the first input shaft 10 can be avoided, the occupied space is small, the layout is more reasonable, and the volume of the power transmission system is reduced.

[0049] According to an embodiment of the present invention, as Figures 1-2 shown in the figure, the second transfer mechanism is configured as one or more second intermediate shafts 10a. A second transfer input gear 10b and a second transfer output gear 10c are provided on each second intermediate shaft 10a. The second intermediate shaft 10a is arranged parallel and offset in the axial direction of the first input shaft 10 with respect to the intermediate shaft 30. A first input shaft first output gear 11 is provided on the first input shaft 10. The second transfer input gear 10b meshes with the first input shaft first output gear 11. An output shaft first input gear 41 selectively linked with the output shaft 40 is provided on the output shaft 40. The output shaft first input gear 41 meshes with the second transfer output gear 10c.

[0050] By configuring the second transfer mechanism as the second intermediate shaft 10a and simultaneously providing the second transfer input gear 10b and the second transfer output gear 10c, the power of the first input shaft 10 can be transmitted to the output shaft 40, and the output shaft first input gear 41 can be selectively engaged with the output shaft 40 to achieve the engagement control of the first transmission path. By arranging the second intermediate shaft 10a parallel and offset with respect to the intermediate shaft 30, the mutual interference between the second intermediate shaft 10a and the intermediate shaft 30 can be avoided, a complex nested shaft structure can be avoided, the layout is more reasonable, the reliability of the transmission system is improved, and the production and maintenance costs are reduced. According to an embodiment of the present invention, as Figures 1-6 shown in the figure, a first input shaft second output gear 12 is sleeved on the first input shaft 10. A second intermediate shaft input gear 33 meshing with the first input shaft second output gear 12 is further provided on the intermediate shaft 30. The first input shaft second output gear 12 can transmit power to the intermediate shaft 30 to achieve the power transmission of the third power transmission path.

[0051] In the power transmission system according to the present invention, a first shifting device k1 is further provided. The first shifting device k1 is disposed on the first input shaft 10 and selectively engages the first input shaft 10 with the first double gear 20a or the second output gear 12 of the first input shaft. When the first input shaft 10 is engaged with the first double gear 20a, the second transmission path of the power transmission system can be maintained, that is, the power transmission in the first gear and the fourth gear of the power transmission system can be realized, and the power coupling between the first input shaft 10 and the second input shaft 20 can also be realized. When the first input shaft 10 is combined with the second output gear 12 of the first input shaft, the third power transmission path of the power transmission system can be maintained, that is, the power transmission in the second gear and the fifth gear of the power transmission system can be realized.

[0052] According to an embodiment of the present invention, as Figures 1-4 shown, a second shifting device k2 is provided on the output shaft 40. The second shifting device k2 selectively engages the output shaft 40 with the first input shaft 10 or engages the first input gear 41 of the output shaft with the output shaft 40. When the second shifting device k2 engages the output shaft 40 with the first input shaft 10, the engine 1 or the first electric generator 2 can independently drive directly in the sixth gear or be linked in parallel with the first electric generator 1, or the second electric generator 2 can jointly provide forward gear drive in parallel in the fourth or sixth gear. When the second shifting device k2 engages the first input gear 41 of the output shaft with the output shaft 40, the first transmission path can be realized to achieve the third gear transmission of the power transmission system. The engine 1 can independently drive directly in the third gear or be linked in parallel with the first electric generator 2, or the second electric generator 3 can jointly provide forward gear drive in parallel in the first, third or fourth gear.

[0053] According to an embodiment of the present invention, as Figures 1-6 shown, a plurality of intermediate shaft output gears are provided on the intermediate shaft 30, which can be the first intermediate shaft output gear 32a and the second intermediate shaft output gear 32b; a plurality of output shaft second input gears meshing with the intermediate shaft output gears one by one are sleeved on the output shaft 40, which are the first output shaft second input gear 42a and the second output shaft second input gear 42b respectively, and the output shaft 40 can selectively mesh with one of the first output shaft second input gear 42a or the second output shaft second input gear 42b.

[0054] By providing a plurality of intermediate shaft output gears on the intermediate shaft 30 and a plurality of output shaft second input gears on the output shaft 40, the transmission ratio between the intermediate shaft 30 and the output shaft 40 can be enriched. According to an embodiment of the present invention, as Figure 1 shown, the power transmission system further includes a third shifting device k3. The third shifting device k3 is disposed on the output shaft 40 and selectively engages one of the plurality of output shaft second input gears with the output shaft 40.

[0055] The third shifting device k3 is utilized to change the combination of the second input gear of the different output shafts and the output shaft 40, thereby realizing the shifting of different gears between the intermediate shaft 30 and the output shaft 40 of the power transmission system.

[0056] According to an embodiment of the present invention, as Figures 1-6 shown, the intermediate shaft 30 is configured as one or more, each intermediate shaft 30 is respectively linked with the first transfer mechanism, and a plurality of intermediate shaft output gears are arranged on each intermediate shaft 30.

[0057] By arranging a plurality of intermediate shafts 30, the load that the intermediate shaft 30 can transmit power is increased, the applicable range of the power transmission system is improved, and the power transmission system of the present invention can be more applicable to heavy-duty vehicles.

[0058] According to an embodiment of the present invention, as Figures 1-6 shown, a clutch 4 is arranged between the engine output shaft 70 of the engine 1 and the first input shaft 10, and the clutch 4 can selectively engage the engine output shaft 70 and the first input shaft 10.

[0059] The clutch 4 is adapted to control whether the engine 1 is connected to the first input shaft 10. In the pure electric state, the connection between the engine 1 and the first input shaft 10 can be disconnected, and only the power of the first motor-generator 2 and / or the second motor-generator 3 is utilized for output.

[0060] The vehicle according to the present invention will be briefly described below.

[0061] The vehicle according to the present invention is provided with the power transmission system described in any one of the above embodiments. Therefore, the vehicle can be a hybrid heavy-duty vehicle, which has multiple gears to be applicable to different loads, effectively reducing fuel consumption. At the same time, when the vehicle is shifting gears, power interruption can be avoided, the power switching is smoother, and the comfort and power performance of the vehicle are good.

[0062] When the vehicle is in the parking charging mode and the power of the on-vehicle power battery is low, the first motor-generator 2 converts the mechanical power of the engine 1 into electrical energy through electromechanical conversion, thereby charging the on-vehicle power battery, and the second motor-generator 3 is in the shutdown state. At this time, the clutch 4 is closed, and the first shifting device k1, the second shifting device k2, and the third shifting device k3 are all in the neutral state.

[0063] When the vehicle is in the pure electric drive mode and the on-vehicle power battery has sufficient power, the first electric generator 2 and / or the second electric generator 3 provide pure electric drive for the vehicle. The first electric generator 2 can drive in six gears or be in neutral, and the second electric generator 3 can operate in the first gear, the third gear, the fourth gear or the sixth gear to drive or be in neutral. When the vehicle shifts gears, one motor maintains the current gear, and the other motor can smoothly switch to other gears, so as to achieve shift without power interruption. At this time, the clutch 4 is opened, and the first shift device k1, the second shift device k2 and the third shift device k3 provide drive or neutral as required.

[0064] When the vehicle is in the series hybrid mode and the on-vehicle power battery has insufficient power, the first electric generator 2 converts the mechanical power of the engine 1 into electrical energy to charge the on-vehicle power battery. Part of the electrical energy can be directly provided to the second electric generator 3, and the second electric generator 3 independently provides forward or reverse drive in the first gear or the fourth gear. At this time, the clutch 4 is closed, the first shift device k1 and the second shift device k2 are in neutral, and the third shift device k3 is engaged with the second input gear 42a of the first output shaft or the second input gear 42b of the second output shaft. The power is transmitted from the second electric generator 3 to the second input shaft 20, and then from the second input shaft 20 to the first transfer mechanism. The first transfer mechanism transmits the power to the intermediate shaft 30, and the intermediate shaft 30 transmits the power to the first intermediate shaft output gear 32a or the second intermediate shaft output gear 32b. After the third shift device k3 shifts gears, the power is output through the output shaft 40, and the vehicle can be driven forward or backward by the first or fourth gear of the second motor.

[0065] Specifically, the second electric generator 3 outputs power. The second input shaft 20 is power-connected to the second electric generator 3. A second input shaft gear 21 is provided on the second input shaft 20. The first double-connected input gear 20b meshes with the second input shaft gear 21. The first double-connected input gear 20b is located on the first transfer mechanism, that is, the first double-connected gear 20a. The first double-connected gear 20a has a first double-connected output gear 20c. The first double-connected output gear 20c meshes with the intermediate shaft input gear on the intermediate shaft 30. The intermediate shaft 30 is provided with a first intermediate shaft output gear 32a and a second intermediate shaft output gear 32b. The first intermediate shaft output gear 32a and the second intermediate shaft output gear 32b are respectively meshed with the second input gear 42a of the first output shaft and the second input gear 42b of the second output shaft on the output shaft 40, so as to output the power to the output shaft 40 and transmit the power to the vehicle for driving.

[0066] As Figure 1As shown, the power transmission system of the present application applies four different transmission paths to perform shift without power interruption between six gears. During the gear shift process, the power source that provides drive for the output shaft 40 also switches between the engine 1, the first motor generator 2, and the second motor generator 3.

[0067] When the vehicle is in the engine first gear direct drive or parallel hybrid mode, the clutch 4 is closed, the first shifting device k1 engages the first input shaft 10 with the first double-output gear 20c, the second shifting device k2 is in neutral, and the third shifting device k3 engages the output shaft 40 with the second output shaft second input gear 42b. The engine 1 or the first motor generator 2 and / or the second motor generator 3 serves as the power source. The power of the power source is transmitted from the first input shaft 10 and / or the second input shaft 20 to the intermediate shaft 30 through the first double-output gear 20c, and the intermediate shaft 30 transmits the power from the second output shaft second input gear 42b to the output shaft 40. When the vehicle is in the engine second gear direct drive or parallel hybrid mode, the clutch 4 is closed, the first shifting device k1 engages the first input shaft 10 with the first input shaft second output gear 12, the second shifting device k2 is in neutral, and the third shifting device k3 engages the output shaft 40 with the second output shaft second input gear 42b. The engine 1 independently drives directly in the second gear or is in parallel linkage with the first motor generator 2, and / or the second motor generator 3 provides forward gear drive in parallel linkage in the first gear. The power of the engine 1 and / or the first motor generator 2 is transmitted from the first double-output gear 20c of the first input shaft 10 to the intermediate shaft 30, and / or the power of the second motor generator 2 is transmitted from the intermediate shaft first input gear 31 to the intermediate shaft 30 for linkage, and the intermediate shaft 30 transmits the power from the second output shaft second input gear 42b to the output shaft 40.

[0068] When the vehicle is in the engine third gear direct drive or parallel hybrid mode, the clutch 4 is closed, and the second shifting device k2 engages the output shaft 40 with the output shaft first input gear 41; or the first shifting device k1 is in neutral, the third shifting device k3 is in neutral or engages the output shaft 40 with the first output shaft second input gear 42a or the second output shaft second input gear 42b, so that the second motor generator 3 is in neutral or the first or fourth gear; or the third shifting device k3 is in neutral, the first shifting device k1 engages the first input shaft 10 with the first double-output gear 20c, and the second motor generator 3 is also in the third gear. The engine 1 independently drives directly in the third gear or is in parallel linkage with the first motor generator 2, and / or the second motor generator 3 provides forward gear drive in parallel linkage in the first, third, fourth, or neutral gear.

[0069] When the vehicle is in the direct drive of the fourth gear of the engine or the parallel hybrid mode, the clutch 4 is closed, the first shifting device k1 engages the first input shaft 10 with the first double-output gear 20c, the second shifting device k2 is in neutral, and the third shifting device k3 engages the output shaft 40 with the second input gear 42a of the first output shaft. The engine 1 independently provides forward gear drive in the direct drive of the fourth gear or in parallel with the first electric generator 2 and / or the second electric generator 3. The power of the power source is transmitted to the intermediate shaft 30 through the first double-output gear 20c by the first input shaft 10 and / or the second input shaft 20, and the intermediate shaft 30 transmits the power to the output shaft 40 through the second input gear 42a of the first output shaft.

[0070] When the vehicle is in the direct drive of the fifth gear of the engine or the parallel hybrid mode, the clutch 4 is closed, the first shifting device k1 engages the first input shaft 10 with the second output gear 12 of the first input shaft, the second shifting device k2 is in neutral, and the third shifting device k3 engages the output shaft 40 with the second input gear 42a of the first output shaft. The engine 1 independently provides forward gear drive in the direct drive of the fifth gear or in parallel with the first electric generator 2, and / or the second electric generator 3 provides forward gear drive in parallel in the fourth gear. The power of the engine 1 and / or the first electric generator 2 is transmitted to the intermediate shaft 30 through the second output gear 12 of the first input shaft of the first input shaft 10, and / or the power of the second electric generator 2 is transmitted to the intermediate shaft 30 through the first input gear 31 of the intermediate shaft for linkage. The intermediate shaft 30 transmits the power to the output shaft 40 through the second input gear 42a of the first output shaft.

[0071] When the vehicle is in the sixth gear direct drive or parallel hybrid mode of the engine, the clutch 4 is closed, the first shifting device k1 engages the first input shaft 10 with the first double-output gear 20c, the second shifting device k2 engages the output shaft 40 with the first output gear 11 of the first input shaft, and the third shifting device k3 is in neutral; or the clutch 4 is closed, the first shifting device k1 is in neutral, the second shifting device k2 engages the output shaft 40 with the first output gear 11 of the first input shaft, and the third shifting device k3 is in neutral or engages the output shaft 40 with the second input gear 42a of the first output shaft. The engine 1 independently directly drives in the sixth gear or is in parallel linkage with the first motor generator 2, or the second motor generator 3 jointly provides forward gear drive in parallel linkage in the fourth gear, sixth gear or neutral. The power of the engine 1 and / or the first motor generator 2 is directly transmitted from the first input shaft 10 to the output shaft 40. Further, when the vehicle continuously stays in the sixth gear high-speed cruise direct drive mode of the engine, the first shifting device k1 and the third shifting device k3 can be set in neutral, the second motor generator 3 can be completely stationary and shut down, and the relevant shaft and gear transmission mechanism connected to the second motor generator 3 includes a second input shaft 20, a second input shaft gear 21, a second output gear 12 of the first input shaft, a first double-input gear 20b, a first double-output gear 20c, an intermediate shaft 30, a first input gear 31 of the intermediate shaft, a first output gear 32a of the intermediate shaft, a second output gear 32b of the intermediate shaft, a second input gear 33 of the intermediate shaft, a second input gear 42a of the first output shaft, and a second input gear 42b of the second output shaft, all of which are completely in a stationary and non-rotating state, thereby greatly reducing the oil churning loss of the transmission system during high-speed driving and improving the fuel economy of the vehicle.

[0072] According to an embodiment of the present invention, as Figures 1 to 6 shown, the first motor generator 2 and the second motor generator 3 are arranged offset from the engine input shaft 70, which can reduce the torque requirements of the first motor generator 2 and the second motor generator 3, simplify the oil seal arrangement of the first motor generator 2 and the second motor generator 3, make the oil seal arrangements of the first motor generator 2, the second motor generator 3 and the engine 1 simpler, have a better lubrication and sealing effect, the engine 1 can be coaxially arranged with the first input shaft 10, and the first motor generator 2 can be linked with the first input shaft 10 through a first-stage reduction gear.

[0073] According to an embodiment of the present invention, as Figure 3As shown, a structure of an intermediate shaft 30 can be adopted, and the second intermediate shaft 10a of the second transfer mechanism is arranged parallel to the intermediate shaft 30 in the circumferential direction of the first input shaft 10 and the output shaft 40, and the second transfer input gear 10b and the second transfer output gear 10c are fixedly arranged on the second intermediate shaft 10a, respectively meshing with the first input shaft first output gear 11 and the output shaft first input gear 41, and the first input shaft 10 is linked with the second transfer mechanism. The second transfer mechanism is arranged independently of the intermediate shaft 30 and does not interfere with each other, which can simplify the production and manufacturing process of the shaft gear mechanism of the transmission system and is conducive to system cost reduction. The transmission system structure of the single intermediate shaft structure is simplified, and the load-bearing capacity is weaker than that of the transmission system with multiple intermediate shafts, and is suitable for light vehicles with small traction requirements.

[0074] According to one embodiment of the present invention, Figure 5 As shown, based on Figure 3 On the basis of the power transmission system embodiment of the single intermediate shaft structure, the second input shaft gear 21 connected to the second motor generator 3 is directly meshed with the first input gear 31 of the intermediate shaft, and the assembly of the first double input gear 20b is cancelled, thereby further simplifying the transmission path of the second motor generator 3 and improving the cost performance of the transmission system.

[0075] According to three embodiments of the present invention, the power transmission system further comprises a sub-transmission, such as Figure 2 , 4 As shown in 6, based on Figure 1 , 3 and Figure 5 Based on the power transmission system of the structure, the output shaft 40 is linked with the auxiliary gearbox. The auxiliary gearbox has a third input shaft 40a, an auxiliary speed change output shaft 60, and an auxiliary speed change intermediate shaft 50. The third input shaft 40a is connected to the output shaft 40. A third input shaft output gear 61 is provided on the third input shaft 40a. The auxiliary speed change intermediate shaft 50 is provided with an auxiliary speed change intermediate shaft input gear 50a. The auxiliary speed change intermediate shaft input gear 50a meshes with the third input shaft output gear 61. The auxiliary speed change intermediate shaft 50 is provided with an auxiliary speed change intermediate shaft output gear 50b. The auxiliary speed change output shaft 60 is sleeved with an auxiliary speed change output shaft input gear 62 meshed with the auxiliary speed change intermediate shaft output gear 50b. The auxiliary speed change shift mechanism k4 is provided in the auxiliary gearbox. The auxiliary speed change shift mechanism k4 can selectively engage the third input shaft 40a with the auxiliary speed change output shaft 60 or the auxiliary speed change output shaft 60 with the auxiliary speed change output shaft input gear 62. By setting up a sub-transmission, the gear position of the main transmission can be doubled, further enriching the gear position of the power transmission system and being adaptable to heavy and super-heavy vehicles.

[0076] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0077] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A power transmission system, characterized in that, it includes: an engine, a first motor generator, and a second motor generator; a first input shaft, which is respectively power-connected to the engine and the first motor generator; a second input shaft, which is power-connected to the second motor generator; a first transfer mechanism, which is selectively engageable with the first input shaft and is linked to the second input shaft; a second transfer mechanism, which is linked to the first input shaft; an intermediate shaft, which is linked to the first transfer mechanism and is selectively linkable to the first input shaft; an output shaft, which is selectively linkable to the intermediate shaft and / or the second transfer mechanism and / or the first input shaft; wherein the first input shaft and the output shaft are coaxially arranged, and the second transfer mechanism and the intermediate shaft are circumferentially spaced apart from the first input shaft.

2. The power transmission system according to claim 1, characterized in that, the first transfer mechanism is configured as a first double gear sleeved on the outer periphery of the first input shaft; wherein a second input shaft gear is provided on the second input shaft, and a first double input gear meshing with the second input shaft gear is provided on the first double gear; a first intermediate shaft input gear is provided on the intermediate shaft, and a first double output gear meshing with the first intermediate shaft input gear is provided on the first double gear.

3. The power transmission system according to claim 2, characterized in that, the second transfer mechanism is configured as one or more second intermediate shafts, and each second intermediate shaft is provided with a second transfer input gear and a second transfer output gear. The second intermediate shaft is parallel and offset circumferentially from the intermediate shaft with respect to the first input shaft, and a first input shaft first output gear meshing with the second transfer input gear is provided on the first input shaft; an output shaft first input gear selectively linkable to the output shaft is provided on the output shaft, and the output shaft first input gear meshes with the second transfer output gear.

4. The power transmission system according to claim 3, characterized in that, a first input shaft second output gear is sleeved on the first input shaft, and a second intermediate shaft input gear meshing with the first input shaft second output gear is provided on the intermediate shaft; and further includes: a first shifting device, which is provided on the first input shaft and selectively engages the first input shaft with the first double gear or the first input shaft second output gear.

5. The power transmission system according to claim 3, characterized in that, a second shifting device is provided on the output shaft, and the second shifting device selectively engages the output shaft with the first input shaft or the output shaft first input gear with the output shaft.

6. The power transmission system according to claim 1, characterized in that, A plurality of intermediate shaft output gears are provided on the intermediate shaft, and a plurality of second output shaft input gears that are each meshed with one of the intermediate shaft output gears are sleeved on the output shaft in a floating manner, and the output shaft is selectively engageable with one of the second output shaft input gears.

7. The power transmission system according to claim 6, wherein, further comprising: a third shifting device that is provided on the output shaft and selectively engages one of the plurality of second output shaft input gears with the output shaft.

8. The power transmission system according to claim 6, wherein, the intermediate shaft is configured as one or more, each intermediate shaft is respectively linked with the first transfer mechanism, and a plurality of the intermediate shaft output gears are provided on each intermediate shaft.

9. The power transmission system according to claim 1, wherein, a clutch is provided between the engine output shaft of the engine and the first input shaft to selectively engage the engine output shaft and the first input shaft.

10. A vehicle, wherein, comprises the power transmission system according to any one of claims 1-9.

Images