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 motor generator, a second motor 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 motor generator; the second input shaft is in power connection with the second motor 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; the output shaft is selectively linked with the intermediate shaft and / or the second intermediate mechanism and / or the first input shaft. The power transmission system realizes respective gear shifting without power interruption under various working conditions through three different transmission paths, and has a compact structure and a reasonable layout.

Description

Technical Field

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

[0002] In related technologies, with the development of the hybrid technology of fuel and electricity, the fields where the hybrid technology of fuel and electricity can be applied 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 adapt 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 of fuel and electricity, 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. 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 two different transmission paths, and has a compact structure and a reasonable layout.

[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 that is respectively power-connected to the engine and the first motor generator; a second input shaft that is power-connected to the second motor generator; a first transfer mechanism that is selectively engaged with the first input shaft and is linked to the second input shaft; a second transfer mechanism that is linked to the first input shaft; an intermediate shaft that is linked to the first transfer mechanism; and an output shaft that is selectively linked to the intermediate shaft and / or the second transfer mechanism and / or the first input shaft.

[0006] According to the power transmission system of the present invention, by providing the first transfer mechanism, the second transfer mechanism, and the intermediate shaft, the hybrid power of three power sources in various different working conditions can be realized, and three 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 three power transmission paths, the power interruption during gear shifting of the power transmission system can be avoided, the smoothness of the power transmission system can be improved, and the jerks during driving can be reduced.

[0007] According to some embodiments of the present invention, the first intermediate 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 input gear is provided on the intermediate shaft, and a first double output gear meshing with the intermediate shaft input gear is provided on the first double gear.

[0008] According to some embodiments of the present invention, the power transmission system further includes: a first shifting device, which is arranged on the first input shaft and can selectively engage the first input shaft with the first double gear.

[0009] According to some embodiments of the present invention, the second intermediate mechanism is configured as one or more second intermediate shafts, a second intermediate input gear and a second intermediate output gear, wherein the second intermediate shaft is arranged parallel and offset in the circumferential direction of the first input shaft and the output shaft with respect to the intermediate shaft, the second intermediate input gear and the second intermediate output gear are fixedly arranged on the second intermediate shaft, a first input shaft output gear is provided on the first input shaft, and the second intermediate input gear meshes with the first input shaft output gear; an output shaft first input gear that can be selectively combined with the output shaft is sleeved on the output shaft, and the output shaft first input gear meshes with the second intermediate 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 can selectively engage the output shaft with the first input shaft or the output shaft with the output shaft first input gear.

[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 can be selectively engaged with one of the output shaft second input gears. According to some embodiments of the present invention, the power transmission system further includes: a third shifting device, which is arranged on the output shaft and can selectively engage one of the plurality of output shaft second input gears with the output shaft.

[0012] According to some embodiments of the present invention, the intermediate shaft is configured as one or more, each intermediate shaft is respectively linked with the first intermediate mechanism, and a plurality of the intermediate shaft output gears are provided on each intermediate shaft. According to some embodiments of the present invention, a clutch is provided between the engine output shaft of the engine and the first input shaft to selectively engage the engine output shaft with the first input shaft.

[0013] The vehicle according to another aspect of the present invention will be briefly described below.

[0014] The vehicle according to the present invention applies the powertrain of the above embodiment. Therefore, the vehicle can be a hybrid heavy-duty vehicle, which has multiple gears to adapt to different loads, effectively reducing fuel consumption. At the same time, when the vehicle is shifting gears, power interruption can be avoided, and the power switch is smoother, with good comfort and power performance of the vehicle.

[0015] The additional aspects and advantages of the present invention will be partially given in the following description, partially will become obvious from the following description, or will be learned through the practice of the present invention. Brief Description of the Drawings

[0016] 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, in which:

[0017] Figure 1 is a schematic structural diagram of a powertrain according to a specific embodiment of the present invention.

[0018] Figure 2 is a schematic structural diagram of a powertrain including a secondary transmission according to a specific embodiment of the present invention.

[0019] Figure 3 is a schematic structural diagram of a single intermediate shaft powertrain according to a specific embodiment of the present invention.

[0020] Figure 4 is a schematic structural diagram of a single intermediate shaft powertrain including a secondary transmission according to a specific embodiment of the present invention.

[0021] Figure 5 is a schematic structural diagram of a single intermediate shaft powertrain according to another specific embodiment of the present invention.

[0022] Figure 6 is a schematic structural diagram of a single intermediate shaft powertrain including a secondary transmission according to another specific embodiment of the present invention.

[0023] Reference Signs:

[0024] Engine 1; engine output shaft 70; first electric generator 2; second electric generator 3; clutch 4;

[0025] First input shaft 10; first input shaft output gear 11;

[0026] Second input shaft 20; second input shaft gear 21;

[0027] Intermediate shaft 30; intermediate shaft input gear 31; first intermediate shaft output gear 32a; second intermediate shaft output gear 32b;

[0028] Output shaft 40; first output shaft input gear 41; first second output shaft input gear 42a; second second output shaft input gear 42b;

[0029] Second intermediate rotating shaft 10a; second intermediate rotating input gear 10b; second intermediate rotating output gear 10c;

[0030] First double gear 20a; first double input gear 20b; first double output gear 20c;

[0031] First shifting device k1; second shifting device k2; third shifting device k3;

[0032] Third input shaft 40a; third input shaft output gear 61; auxiliary speed change shifting mechanism k4;

[0033] Auxiliary speed change intermediate shaft 50; auxiliary speed change intermediate shaft input gear 50a; auxiliary speed change intermediate shaft output gear 50b;

[0034] Auxiliary speed change output shaft 60; auxiliary speed change output shaft input gear 62. Detailed implementation mode

[0035] The embodiments of the present invention will be described in detail below. The 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 and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0036] The following reference Figures 1-3 Describe a power transmission system according to an embodiment of the present invention, including: an engine 1, a first electric generator 2 and a second electric generator 3. The first input shaft 10 is respectively power-connected to the engine 1 and the first electric generator 2, and the second input shaft 20 is power-connected to the second electric generator 3; the first intermediate mechanism is selectively engaged with the first input shaft 10 and is linked with the second input shaft 20, the second intermediate mechanism is linked with the first input shaft 10, the intermediate shaft 30 is linked with the first intermediate mechanism, and the output shaft 40 is respectively selectively linked with the intermediate shaft 30 and / or the second intermediate mechanism and / or the first input shaft 10.

[0037] 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 system applied to sedans cannot be adapted to heavy-duty vehicles. In particular, for the hybrid power transmission system of 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 have become technical problems in this field.

[0038] In the present application, there are three non-interfering transmission paths in the power transmission system.

[0039] The first one is that the engine 1 and / or the first electric generator 2 and / or the second electric generator 3 serve as power sources. The first input shaft 10 is linked with the second intermediate mechanism, and the output shaft 40 is selectively linked with the second intermediate mechanism, so that the power of the engine 1 and / or the first electric generator 2 and / or the second electric generator 3 can be output through the first input shaft 10, the second intermediate mechanism and the output shaft 40.

[0040] The second one is that the engine 1 and / or the first electric generator 2 and / or the second electric generator 3 serve as power sources. The second input shaft 20 is linked with the first intermediate mechanism and / or the first input shaft, and the first intermediate mechanism is linked with the intermediate shaft 30, and the output shaft 40 is selectively linked with the intermediate shaft 30 to achieve the output of power.

[0041] The third one is that 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 selectively linked with the first input shaft 10 to achieve the output of power.

[0042] In the above three power transmission paths, each transmission path can correspond to multiple gear positions, and the gear positions in each transmission path increase alternately. For example, the first transmission path has the second gear of the power transmission system, while the second transmission path has the first gear and the third gear of the power transmission system, and the third transmission path has the fourth gear of the power transmission system. When switching between two adjacent gear positions, there will be no mutual interference between different power transmission paths. During gear shifting, since the three power transmission paths do not interfere with each other.

[0043] In a specific embodiment of the present invention, such as Figure 1As shown, during the shift process of the power transmission system from the first gear to the second gear for the engine 1 and / or the first electric generator 2, the power of the engine 1 and / or the first electric generator 2 needs to be switched between the intermediate shaft 30 and the second transfer mechanism for the output shaft 40. The second electric generator 3 can be used in advance to output power through the transmission path of the second input shaft 20, the first transfer mechanism, and the intermediate shaft 30, so that when the output shaft 40 is disconnected from the second transfer mechanism, the power between the intermediate shaft 30 and the output shaft 40 is not interrupted, avoiding power interruption of the output shaft 40 during the gear shift process, improving the smoothness of the power transmission system and the comfort of power transmission, and reducing the sense of jerk during driving.

[0044] Similarly, during the shift process of the engine 1 and / or the first electric generator 2 from the second gear to the third gear, the power of the engine 1 and / or the first electric generator 2 needs to be switched from the output shaft 40 from the second transfer mechanism to the intermediate shaft 30. The second electric generator 3 can be used in advance to output power through the first transfer mechanism, the intermediate shaft 30, and the output shaft 40 to enter the third gear, reducing the loss of power interruption during the process of the power of the engine 1 and / or the first electric generator 2 disconnecting the second transfer mechanism from the output shaft 40 and making a linked switch to the intermediate shaft 30 and the output shaft 40, compensating for the power interruption during gear shifting, avoiding power interruption of the output shaft 40, so as to improve the smoothness of the power transmission system and the comfort of power transmission, and reducing the sense of jerk during driving.

[0045] Similarly, during the shift process of the engine 1 and / or the first electric generator 2 from the third gear to the fourth gear, the power of the engine 1 and / or the first electric generator 2 needs to be switched from the intermediate shaft 30 to the output shaft 40 to disconnect the output and then switch to directly output from the first input shaft 10 to the output shaft 40. The second electric generator 3 can be used in advance to output power through the first transfer mechanism, the intermediate shaft 30, and the output shaft 40 to maintain the third gear output. During the process of the power of the engine 1 and / or the first electric generator 2 disconnecting the intermediate shaft 30 from the output shaft 40 and making a direct linked switch to the first input shaft 10 and the output shaft 40, the loss of power interruption is reduced, the power interruption during gear shifting is compensated, and the power interruption of the output shaft 40 is avoided, so as to improve the smoothness of the power transmission system and the comfort of power transmission, and reduce the sense of jerk during driving. In addition, the first transfer mechanism can be selectively engaged with the first input shaft 10 to realize the power connection between the engine 1, the first input shaft 10, and the second input shaft 20, which is suitable for realizing the maximum torque output when the power of the power transmission system is insufficient. At the same time, the power transmission system of the present application can also utilize three different transmission paths, and in the series hybrid mode where the engine 1 drives the first electric generator 2 to generate electricity while only the second electric generator 3 is used for output.

[0046] According to the power transmission system of the present invention, by providing a first transfer mechanism, a second transfer mechanism, and an intermediate shaft 30, various different operating conditions of the hybrid power of the three power sources can be realized. Three 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 three power transmission paths, the power interruption during gear shifting of the power transmission system can be avoided, the smoothness of the power transmission system can be improved, and the sense of jerk during driving can be reduced.

[0047] According to some embodiments of the present invention, as Figure 1 shown, the first transfer mechanism is configured as a first double gear 20a sleeved on the outer periphery of the first input shaft 10, and a second input shaft gear 21 is provided on the second input shaft 20. The first double gear 20a is provided with a first double input gear 20b meshing with the second input shaft gear 21. An intermediate shaft input gear 31 is provided on the intermediate shaft 30, and a first double output gear 20c is provided on the first double gear 20a of the first transfer mechanism. The first double output gear 20c meshes with the intermediate shaft input gear 31, so that the intermediate shaft 30 is linked with the first transfer mechanism.

[0048] 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 can link the second input shaft 20 and the intermediate shaft 30; sleeving the first double gear 20a on the first input shaft 10 can avoid the mutual interference between the first double gear 20a and the first input shaft 10, occupy less space, have a more reasonable layout, and reduce the volume of the power transmission system.

[0049] According to some embodiments of the present invention, as Figure 1 shown, a first shifting device k1 is further provided in the power transmission system. The first shifting device k1 is provided on the first input shaft 10 and can selectively engage the first input shaft 10 with the first double gear 20a.

[0050] 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 of the power transmission system in the second gear and the fourth gear can be realized, and the power coupling between the first input shaft 10 and the second input shaft 20 can also be realized.

[0051] According to some embodiments of the present invention, as Figure 1As shown, the second transfer mechanism is constructed of one or more second transfer shafts 10a, a second transfer input gear 10b and a second transfer output gear 10c. The second transfer shaft 10a is arranged in parallel and offset with the intermediate shaft 30 in the axial direction of the first input shaft 10. The second transfer input gear 10b and the second transfer output gear 10c are fixedly arranged on the second transfer shaft 10a. The first input shaft 10 is provided with a first input shaft output gear 11, and the second transfer input gear 10b is meshed with the first input shaft output gear 11. The output shaft 40 is hollowly sleeved on the output shaft 40 and can be selectively linked with the output shaft 40. The output shaft first input gear 41 is meshed with the second transfer output gear 10c.

[0052] The second transfer mechanism is constructed as a second transfer second transfer shaft 10a, and a second transfer input gear 10b and a second transfer output gear 10c are provided. 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 realize the engagement control of the first transmission path; the second transfer shaft 10a and the intermediate shaft 30 are arranged in parallel and offset, which can avoid mutual interference between the second transfer second transfer shaft 10a and the intermediate shaft 30, avoid the use of a complex sleeve shaft structure, make the layout more reasonable, improve the reliability of the transmission system, and reduce the production and maintenance costs.

[0053] According to some embodiments of the present invention, Figure 1 As shown, a second shifting device k2 is provided on the output shaft 40 , and the second shifting device k2 can selectively engage the output shaft 40 with the first input shaft 10 or engage the output shaft first input gear 41 with the output shaft 40 .

[0054] When the second shifting device k2 engages the output shaft 40 with the first input shaft 10, the engine 1 can be driven directly in the fourth gear independently or in parallel with the first motor generator 2 and / or the second motor generator 3. The second shifting device k2 engages the output shaft first input gear 41 with the output shaft 40 to realize the first transmission path to realize the second gear transmission of the power transmission system, and the engine 1 can be driven directly in the second gear independently or in parallel with the first motor generator 2 and / or the second motor generator 3. According to some embodiments of the present invention, such as Figure 1As shown, a plurality of intermediate shaft output gears 32 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 second input gears of the output shaft that are sleeved on the output shaft 40 and mesh with the intermediate shaft output gears one by one, namely the first second input gear 42a of the output shaft and the second second input gear 42b of the output shaft, and the output shaft 40 can selectively mesh with one of the first second input gear 42a of the output shaft or the second second input gear 42b of the output shaft. By providing a plurality of intermediate shaft output gears on the intermediate shaft 30 and a plurality of second input gears of the output shaft on the output shaft 40, the transmission ratio between the intermediate shaft 30 and the output shaft 40 can be enriched.

[0055] According to an embodiment of the present invention, as Figure 1 shown, the power transmission system further includes a third shifting device k3, and the third shifting device k3 is provided on the output shaft 40 and can selectively engage one of the plurality of second input gears of the output shaft with the output shaft 40.

[0056] By using the third shifting device k3 to change the combination of different second input gears of the output shaft and the output shaft 40, the switching of different gears between the intermediate shaft 30 and the output shaft 40 of the system can be realized.

[0057] According to an embodiment of the present invention, as Figure 1 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 provided on each intermediate shaft 30.

[0058] By providing a plurality of intermediate shafts 30, the load of the power that the intermediate shaft 30 can transmit is increased, the applicable range of the power transmission system is improved, and the power transmission system of the present invention can be made to be applicable to heavy-duty vehicles.

[0059] According to some embodiments of the present invention, as Figure 1 shown, a clutch 4 is provided 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.

[0060] The clutch 4 is suitable for controlling 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 used for output.

[0061] The vehicle according to the present invention will be briefly described below.

[0062] 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 suit different loads and effectively reduces fuel consumption. At the same time, when the vehicle is shifting gears, power interruption can be avoided, the power shift is smoother, and the comfort and power performance of the vehicle are good.

[0063] When the vehicle is in the parking charging mode, 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, so as to charge 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.

[0064] When the vehicle is in the pure electric drive mode and the on-vehicle power battery is fully charged, the first motor generator 2 and the second motor generator 3 provide pure electric drive for the vehicle. The first motor generator 2 and the second motor generator 3 can be in four gears for driving or in the neutral gear. 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 shifting device k1, the second shifting device k2 and the third shifting device k3 provide drive or neutral as required.

[0065] When the vehicle is in the series hybrid mode and the on-vehicle power battery is insufficient in power, the first motor generator 2 converts the mechanical power of the engine 1 into electrical energy to charge the on-vehicle power battery, and part of the electrical energy can be directly supplied to the second motor generator 3. The second motor generator 3 independently provides forward or reverse drive in the first gear or the third gear. At this time, the clutch 4 is closed, the first shifting device k1 and the second shifting device k2 are in the neutral state, and the third shifting 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 motor 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 shifting 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 third gear of the second motor.

[0066] 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-input gear 20b meshes with the second input shaft gear 21. The first double-input gear 20b is located on the first transfer mechanism, i.e., the first double gear 20a. The first double gear 20a has a first double-output gear 20c. The first double-output gear 20c meshes with an intermediate shaft input gear 31 on the intermediate shaft 30. A first intermediate shaft output gear 32a and a second intermediate shaft output gear 32b are provided on the intermediate shaft 30. The first intermediate shaft output gear 32a and the second intermediate shaft output gear 32b respectively mesh with a first output shaft second input gear 42a and a second output shaft second input gear 42b on the output shaft 40, so as to output power to the output shaft 40 and deliver the power to the vehicle for driving.

[0067] As Figure 1 shown, the power transmission system of the present application applies three different transmission paths to perform a shift without power interruption between four 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 electric generator 2, and the second electric generator 3.

[0068] When the vehicle is in the engine first-gear direct drive or parallel hybrid mode, the clutch 4 is closed. The first shift device k1 engages the first input shaft 10 with the first double gear 20a. The second shift device k2 is in neutral. The third shift device k3 engages the output shaft 40 with the output shaft second input gear 42. The engine 1 or the first electric generator 2 and / or the second electric generator 3 serves as the power source. The power is delivered 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. The intermediate shaft 30 delivers the power from the second output shaft second input gear 42b to the output shaft 40.

[0069] When the vehicle is in the direct drive of the second 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-connected output gear 20c, the second shifting device k2 engages the output shaft 40 with the first input gear 41 of the output 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 input gear 41 of the output shaft, and the third shifting device k3 engages the output shaft 40 with the second input gear 42a of the first output shaft or the second input gear 42b of the second output shaft or is in neutral. The engine 1 independently directly drives in the second gear or is linked in parallel with the first motor generator 2, and / or the second motor generator 3 provides forward gear drive or neutral shutdown in parallel linkage in the first, second, or third gear. The power of the power source is transmitted from the first input shaft 10 and / or the second input shaft 20 to the second intermediate rotating shaft 10a through the first input shaft output gear 11, and the second intermediate rotating shaft 10a transmits the power from the second intermediate output gear 10c to the output shaft 40.

[0070] When the vehicle is in the direct drive of the third 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-connected 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 directly drives in the third gear or provides forward gear drive in parallel linkage with the first motor generator 2 and / or the second motor generator 3. 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-connected output gear 20c, and the intermediate shaft 30 transmits the power from the second input gear 42a of the first output shaft to the output shaft 40.

[0071] 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-connected output gear 20c, the second shifting device k2 engages the output shaft 40 with the first input shaft output gear 11, 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 input shaft output gear 11, and the third shifting device k3 engages the output shaft 40 with the second input gear 42a of the first output shaft or the second input gear 42b of the second output shaft or is in neutral. The engine 1 independently directly drives in the fourth gear or is linked in parallel with the first motor generator 2, or the second motor generator 3 provides forward gear drive or neutral shutdown in common parallel linkage in the first, third, or fourth gear. The power of the engine 1 and / or the first motor generator 2 is directly transmitted to the output shaft 40 from the first input shaft 10.

[0072] According to an embodiment of the present invention, as Figures 1 to 6As shown, the first motor generator 2 and the second motor generator 3 are offset from the engine output shaft 70 through a primary reduction gear mechanism, respectively, so that the torque requirements of the first motor generator 2 and the second motor generator 3 can be reduced, and the oil seal arrangement of the first motor generator 2 and the second motor generator 3 can be simplified, so that the oil seal arrangement of the first motor generator 2, the second motor generator 3 and the engine 1 is simpler and the lubrication sealing effect is better. The engine 1 can be coaxially arranged with the first input shaft 10, and the first motor generator 2 can be linked to the first input shaft 10 through a primary reduction gear.

[0073] The engine 1 is coaxially arranged with the first motor generator 2 and the second motor generator 3, a clutch 4 is provided between the engine output shaft 70 of the engine 1 and the first motor generator 2, and the first input shaft 10 is connected to the first motor generator 2. The coaxial arrangement of the engine 1, the first motor generator 2 and the second motor generator 3 can make the structure of the power transmission system more compact.

[0074] According to one embodiment of the present invention, Figure 3 As 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 and non-coaxially on the other side of the circumference 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 output gear 11 and the output shaft first input gear 41, and the first input shaft 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 power transmission system with multiple intermediate shafts, which is suitable for light vehicles with small traction requirements.

[0075] 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.

[0076] According to three other embodiments of the present invention, the power transmission system further includes a sub-transmission, such as Figure 2 , 4 As shown in 6, based on Figure 1 , 3 and Figure 5Based 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 gearbox output shaft 60, and an auxiliary gearbox 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. An auxiliary gearbox intermediate shaft input gear 50a is provided on the auxiliary gearbox intermediate shaft 50. The auxiliary gearbox intermediate shaft input gear 50a meshes with the third input shaft output gear 61. An auxiliary gearbox intermediate shaft output gear 50b is provided on the auxiliary gearbox intermediate shaft 50. An auxiliary gearbox output shaft input gear 62 that meshes with the auxiliary gearbox intermediate shaft output gear 50b is sleeved on the auxiliary gearbox output shaft 60. An auxiliary gearbox shifting mechanism k4 is provided in the auxiliary gearbox. The auxiliary gearbox shifting mechanism k4 can selectively engage the third input shaft 40a with the auxiliary gearbox output shaft 60 or engage the auxiliary gearbox output shaft 60 with the auxiliary gearbox output shaft input gear 62. By providing the auxiliary gearbox, the gear positions of the main gearbox can be magnified by two times, further enriching the gear positions of the power transmission system, and can be adapted to heavy vehicles with higher load requirements.

[0077] In the description of this specification, the description with reference 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 representations 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.

[0078] 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. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A power transmission system, characterized in that, Comprising: An engine, a first electric generator, and a second electric generator; A first input shaft that is respectively power-connected to the engine and the first electric generator; A second input shaft that is power-connected to the second electric generator; A first transfer mechanism that is selectively engageable with the first input shaft and is linked to the second input shaft; A second transfer mechanism that is linked to the first input shaft; An intermediate shaft that is linked to the first transfer mechanism; An output shaft that is selectively linkable to the intermediate shaft and / or the second transfer mechanism and / or the first input shaft; The second transfer mechanism is arranged independently of the intermediate 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; An intermediate shaft input gear is provided on the intermediate shaft, and a first double output gear meshing with the intermediate shaft input gear is provided on the first double gear.

3. The power transmission system according to claim 2, wherein, Further comprising: A first shifting device that is provided on the first input shaft and selectively engages the first input shaft with the first double gear.

4. The power transmission system according to claim 3, characterized in that, The second transfer mechanism is configured as one or more second intermediate shafts, a second transfer input gear, and a second transfer output gear, wherein the second intermediate shaft is disposed parallel and offset in the circumferential direction of the first input shaft with respect to the intermediate shaft, and the second transfer input gear and the second transfer output gear are fixedly provided on the second intermediate shaft; wherein A first input shaft output gear is provided on the first input shaft, and the second transfer input gear meshes with the first input shaft output gear; An output shaft first input gear that is sleeved on the output shaft and is selectively engageable with the output shaft meshes with the second transfer 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 with the output shaft first input gear.

6. The power transmission system according to claim 1, wherein A plurality of intermediate shaft output gears are provided on the intermediate shaft, and a plurality of output shaft second input gears that respectively mesh with the intermediate shaft output gears are sleeved on the output shaft, and the output shaft is selectively engageable with one of the output shaft second 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 output shaft second 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 to 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 with the first input shaft.

10. A vehicle, characterized in that, Comprising the power transmission system according to any one of claims 1-9.

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