Power transmission device, power assembly and vehicle

Abstract

According to the power transmission device, a planet carrier of a planetary gear train is arranged on an input shaft, a sun gear is arranged on an intermediate shaft, a gear ring is in transmission connection with a first synchronizer, the intermediate shaft is sleeved with a first driving wheel in an empty mode, a shell is provided with a synchronous gear, and the shell is provided with a second driving wheel. The first synchronizer is connected with the first driving wheel, the first synchronizer is selectively connected with the synchronous gear, the first driving wheel is in transmission connection with the output shaft through a first transmission unit, a second transmission unit is arranged between the intermediate shaft and the output shaft, and the second synchronizer is selectively connected with the second transmission unit, so that the intermediate shaft and the output shaft can be in transmission connection. When the power transmission device is matched with a power source, various driving modes can be conveniently achieved, and the economical efficiency, the driving performance and the power performance of a vehicle can be improved by reasonably selecting the driving modes under different driving working conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle power systems, and in particular to a power transmission device, a powertrain using the power transmission device, and a vehicle using the powertrain. Background Art

[0002] A hybrid power system is a system that combines two or more different power sources, typically an internal combustion engine and an electric motor in the automotive field. This power system aims to improve fuel efficiency, reduce emissions, and provide better driving performance.

[0003] Existing hybrid systems generally include a power source and a transmission, wherein the power source is used to output power, and the transmission can change the speed ratio between the engine and the drive wheels according to driving conditions and requirements to adapt to different driving speeds and loads.

[0004] There are many types of transmissions available today, but common transmissions, such as the E-CVT (Electronic Continuously Variable Transmission) structure, when matched with a power source to form a powertrain, have fewer drive modes due to the transmission's own structural reasons. During engine operation, the motor will always be driven to rotate synchronously, wasting energy. Utility Model Content

[0005] In view of this, the present invention aims to provide a power transmission device, which can facilitate the realization of multiple driving modes and help save energy when applied to a powertrain.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0007] A power transmission device includes an input shaft, a planetary gear train, an intermediate shaft, a first synchronizer, a second synchronizer, and an output shaft;

[0008] The planets of the planetary gear train are mounted on the input shaft, the sun gear of the planetary gear train is mounted on the intermediate shaft, and the ring gear of the planetary gear train is in driving connection with the first synchronizer;

[0009] A first driving wheel is mounted on the intermediate shaft, a synchronous gear is mounted on the housing of the power transmission device, a first synchronizer is connected to the first driving wheel, and the first synchronizer is selectively connected to the synchronous gear, and the first driving wheel is connected to the output shaft through a first transmission unit;

[0010] A second transmission unit is provided between the intermediate shaft and the output shaft. The second synchronizer is provided on the intermediate shaft or the output shaft. The second synchronizer is selectively connected to the second transmission unit to enable transmission connection between the intermediate shaft and the output shaft.

[0011] Furthermore, the second transmission unit includes a second driving wheel fixed on the intermediate shaft, and a second driven wheel loosely sleeved on the output shaft, and the second driving wheel and the second driven wheel are meshed and connected;

[0012] The second synchronizer is provided on the output shaft and selectively connected to the second driven wheel.

[0013] Furthermore, the first transmission unit includes a first driven wheel provided on the output shaft, and the first driving wheel and the first driven wheel are meshed and connected;

[0014] The first synchronizer is provided on the ring gear, and the first synchronizer is selectively connected to the first driving wheel.

[0015] Furthermore, a hollow shaft connected to the ring gear is sleeved on the intermediate shaft, the first driving wheel is sleeved on the hollow shaft, the first synchronizer is provided on the hollow shaft, and the first synchronizer is selectively connected to the first driving wheel;

[0016] The first transmission unit includes a first driven wheel fixed on the output shaft, and the first driving wheel and the first driven wheel are meshed and connected.

[0017] Furthermore, the intermediate shaft includes a first intermediate shaft and a second intermediate shaft, and the sun gear is provided on the first intermediate shaft;

[0018] The first driving wheel is loosely mounted on the first intermediate shaft and is connected to the ring gear as an integral structure. The first synchronizer is arranged on the ring gear. The first transmission unit includes a first driven wheel loosely mounted on the output shaft. The first driving wheel and the first driven wheel are meshed and connected.

[0019] Furthermore, the second transmission unit includes a second driving wheel fixedly mounted on the second intermediate shaft, and a second driven wheel loosely mounted on the output shaft, the second driving wheel and the second driven wheel being meshed and connected; a second synchronizer is mounted on the output shaft, the second synchronizer is selectively connected to the first driven wheel, and the second synchronizer is selectively connected to the second driven wheel;

[0020] A third synchronizer is provided on the first intermediate shaft. The third synchronizer is selectively connected to the first driving wheel, and the third synchronizer is selectively connected to the second driving wheel.

[0021] Furthermore, the output shaft is provided with an output gear, and the output gear is used for transmission connection with the differential.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] The power transmission device described in the present invention is configured to connect the ring gear to the first synchronizer in a transmission manner. The first synchronizer engages the synchronous gear to brake the ring gear, so that the power of the input shaft can be transmitted to the intermediate shaft through the planetary carrier, the planetary gears, and the sun gear, and then transmitted to the output shaft through the first transmission unit. The second synchronizer selectively engages the second transmission unit, and the power between the intermediate shaft and the output shaft can be connected or disconnected as needed. When the input shaft and the intermediate shaft are respectively matched with different power sources, the two power sources can output power separately or together, and one power source does not need to drag the other working source when working, which facilitates the realization of multiple driving modes. Under different driving conditions, the driving mode can be reasonably selected to improve the economy, driving performance and power performance of the vehicle.

[0024] Furthermore, the second transmission unit is configured as a second driving wheel and a second driven wheel, and the second synchronizer is located on the output shaft, which can control the power supply between the intermediate shaft and the output shaft. The first transmission unit includes the second driven wheel, which simplifies the structure. A hollow shaft is provided on the intermediate shaft, and the first synchronizer is located on the hollow shaft. The first synchronizer is selectively connected to the first driving wheel, which can also facilitate the power supply between the ring gear and the output shaft.

[0025] In addition, by connecting the ring gear of the first synchronizer to the first driving wheel and providing a third synchronizer, the number of gears can be increased, making it easier for users to select the appropriate gear. After assembling the power transmission device with the power source, the economy and drivability of the powertrain application can be improved.

[0026] Another object of the present invention is to provide a power assembly comprising the power transmission device as described above, and also comprising a power source;

[0027] The power output end of the power source is transmission-connected to the power transmission device.

[0028] Furthermore, the power source includes an engine and a first motor, the power output end of the engine is transmission-connected to the input shaft, and the power output end of the first motor is transmission-connected to the intermediate shaft.

[0029] The powertrain of the present invention, by applying the above-mentioned power transmission device, not only has the same technical effects as the power transmission device relative to the prior art, but the power source of the powertrain includes an engine and a motor, which makes the powertrain structure simple and light in weight, and can realize switching between pure electric, engine direct drive, E-CVT, and extended range modes.

[0030] Another object of the present invention is to provide a vehicle comprising the powertrain as described above, and further comprising a second motor;

[0031] The power output end of the power assembly is transmission-connected to one drive axle of the vehicle, and the power output end of the second motor is transmission-connected to the other drive axle of the vehicle.

[0032] The vehicle described in the present invention has the same beneficial effects as the aforementioned power transmission device and power assembly relative to the prior art, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0034] Figure 1 This is a schematic structural diagram of the power transmission device according to the first embodiment of the present utility model;

[0035] Figure 2 This is a schematic structural diagram of the power transmission device according to the first embodiment of the present utility model;

[0036] Figure 3 This is a structural diagram of the power transmission device described in Example 2 of the present utility model.

[0037] Description of reference numerals:

[0038] 1. Input shaft; 2. Intermediate shaft; 3. Output shaft; 4. Planetary gear train; 5. First driving gear; 6. First driven gear; 7. Output gear; 8. Differential; 9. First motor; 10. Engine; 11. Second driving gear; 12. Second driven gear; 13. First synchronizer; 14. Second synchronizer; 15. Third synchronizer; 16. Synchronous gear;

[0039] 401, sun gear; 402, planet carrier; 403, ring gear; 404, planet gear;

[0040] 201. First intermediate shaft; 202. Second intermediate shaft. DETAILED DESCRIPTION

[0041] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0042] In the description of this utility model, it should be noted that the orientations or positional relationships shown in the accompanying drawings are merely for the purpose of facilitating the description of this utility model and simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] Additionally, in the description of this utility model, unless otherwise explicitly defined, the terms "mounted," "connected," "connect," and "connector" should be interpreted broadly. For example, these terms may refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0044] It should be noted that each driving wheel and each driven wheel of the present invention preferably adopts a gear structure.

[0045] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0046] Example 1

[0047] This embodiment relates to a power transmission device. When matched with two power sources, the two power sources can output power separately or jointly, and one power source does not need to drag the other working source when working, which facilitates the realization of multiple driving modes. Under different driving conditions, the driving mode can be reasonably selected, which is beneficial to improving the vehicle's economy, driving performance and power performance.

[0048] Based on the above design concept, the power transmission device of this embodiment has an overall structure as follows: Figure 1 As shown, it mainly includes an input shaft 1, a planetary gear system 4, an intermediate shaft 2, a first synchronizer 13, a second synchronizer 14 and an output shaft 3, wherein the input shaft 1 and the intermediate shaft 2 are both used to connect to an external power source, and the power source will be introduced in detail below.

[0049] For ease of description, the structure of planetary gear train 4 is briefly described here. It primarily comprises sun gear 401, planet gears 404, planet carrier 402, and ring gear 403. Sun gear 401 meshes with the planet gears. Planet gears 404 are located between sun gear 401 and outer ring gear 403, supported by planet carrier 402. They can rotate about their own axes and simultaneously orbit around the axis of sun gear 401 along with planet carrier 402. Outer ring gear 403 meshes with planet gears 404, while planet carrier 402 supports them.

[0050] For the convenience of description, in this embodiment, the sun gear 401 of the planetary gear train 4 is called the first sun gear 401, the planetary gear 404 of the planetary gear train 4 is called the first planetary gear 404, the planetary carrier 402 of the planetary gear train 4 is called the first planetary carrier 402, and the ring gear 403 of the planetary gear train 4 is called the first ring gear 403.

[0051] Regarding the specific structure, still refer to Figure 1 As shown, the first planet carrier 402 is disposed on the input shaft 1, and the first sun gear 401 is disposed on the intermediate shaft 2, so that the power of the input shaft 1 can be transmitted to the intermediate shaft 2 through the first planet carrier 402, the first planet gears 404, and the first sun gear 401. The first ring gear 403 is drivingly connected to the first synchronizer 13, so that the power transmitted to the first ring gear 403 through the first planet carrier 402 can be transmitted to the first synchronizer 13.

[0052] A first driving wheel 5 is mounted on the intermediate shaft 2 and is in transmission connection with the output shaft 3 via a first transmission unit, so that the power transmitted to the intermediate shaft 2 can be transmitted to the output shaft 3 via the first transmission unit.

[0053] A synchronous gear 16 is provided on the housing of the power transmission device, and the first synchronizer 13 is connected to the first driving wheel 5, so that the power of the first synchronizer 13 can be transmitted to the first driving wheel 5. The first synchronizer 13 is selectively connected to the synchronous gear 16. As needed, when the synchronizer and the synchronous gear 16 are engaged, the first ring gear 403 can be braked, and when the synchronizer and the synchronous gear 16 are disconnected, the first ring gear 403 can rotate freely.

[0054] A second transmission unit is provided between the intermediate shaft 2 and the output shaft 3 . The second synchronizer 14 is provided on the intermediate shaft 2 or the output shaft 3 . The second synchronizer 14 is selectively connected to the second transmission unit to enable transmission connection between the intermediate shaft 2 and the output shaft 3 .

[0055] Specifically, when the second synchronizer 14 is engaged with the second transmission unit, the power on the intermediate shaft 2 can be transmitted to the output shaft 3 through the second synchronizer 14 and the second transmission unit, and when the second synchronizer 14 is disconnected from the second transmission unit, the power on the intermediate shaft 2 cannot be transmitted to the output shaft 3.

[0056] For example Figure 1 As shown in , as a preferred embodiment, the second transmission unit includes a second driving wheel 11 fixed on the intermediate shaft 2, and a second driven wheel 12 loosely mounted on the output shaft 3, the second driving wheel 11 and the second driven wheel 12 are meshed and connected, and a second synchronizer 14 is provided on the output shaft 3 and selectively connected to the second driven wheel 12.

[0057] When the second synchronizer 14 is engaged with the second driven wheel 12, the power on the intermediate shaft 2 can be transmitted to the output shaft 3 through the second driving wheel 11, the second driven wheel 12 and the second synchronizer 14, while when the second synchronizer 14 is disconnected from the second driven wheel 12, the power on the intermediate shaft 2 cannot be transmitted to the output shaft 3.

[0058] It should be understood that Figure 1 In the illustrated state, the first driving wheel 5 can be fixed to the intermediate shaft 2 or loosely mounted on the intermediate shaft 2. In this case, a synchronizer is required on the intermediate shaft 2. This synchronizer selectively connects the first driving wheel 5 to connect and disconnect the power between the intermediate shaft 2 and the first driving wheel 5. In this case, the second driven wheel 12 can be loosely mounted on the output shaft 3, and a second synchronizer 14 is required on the output shaft 3. Alternatively, the second driven wheel 12 can be fixed to the output shaft 3.

[0059] In the above structure, the second transmission unit is set as the second driving wheel 11 and the second driven wheel 12, and the second synchronizer 14 is set on the output shaft 3 to facilitate the control of power on and off between the intermediate shaft 2 and the output shaft 3.

[0060] Continue to refer to Figure 1 As shown, as a preferred embodiment, the first transmission unit includes a first driven wheel 6 provided on the output shaft 3, and has a simple structure. Preferably, the first driven wheel 6 is fixed to the output shaft 3, and the first driving wheel 5 and the first driven wheel 6 are meshed and connected, so that the power transmitted to the first driving wheel 5 can be transmitted to the output shaft 3 through the second driven wheel 12.

[0061] In a preferred embodiment, the first synchronizer 13 is disposed on the ring gear 403 and is selectively connected to the first driving wheel 5. It should be noted that, with this arrangement, when the first synchronizer 13 is engaged with the first driving wheel 5, the power transmitted to the ring gear 403 can be transmitted to the output shaft 3 via the first synchronizer 13 and the first driving wheel 5. However, when the first synchronizer 13 is disconnected from the first driving wheel 5, the power on the input shaft 1 cannot be transmitted to the output shaft 3.

[0062] It should be noted that, as another preferred embodiment, in addition to arranging the first synchronizer 13 on the ring gear 403, it is also possible to Figure 2As shown in FIG, a hollow shaft connected to the ring gear 403 is sleeved on the intermediate shaft 2. For ease of arrangement, the first driving gear 5 is loosely sleeved on the hollow shaft. The first synchronizer 13 is mounted on the hollow shaft and selectively connects to the first driving gear 5. With this arrangement, when the first synchronizer 13 is engaged with the first driving gear 5, power transmitted to the ring gear 403 can be transmitted to the output shaft 3 via the hollow shaft, the first synchronizer 13, and the first driving gear 5. However, when the first synchronizer 13 is disconnected from the first driving gear 5, power on the input shaft 1 cannot be transmitted to the output shaft 3.

[0063] And in Figure 2 In the state shown, the first transmission unit also includes a first driven wheel 6 fixed to the output shaft 3, and the first driving wheel 5 is meshed and connected with the first driven wheel 6. It should be noted that in addition to including the first driven wheel 6, the first transmission unit can also be other existing structures capable of transmitting power, such as a gear train.

[0064] In the above structure, a hollow shaft is provided on the intermediate shaft 2 , and the first synchronizer 13 is provided on the hollow shaft. The first synchronizer 13 is selectively connected to the first driving wheel 5 , and can also conveniently control the power on and off between the ring gear 403 and the output shaft 3 .

[0065] Reference Figure 1 or Figure 2 As shown, as a preferred embodiment, the output shaft 3 is provided with an output gear 7, which is configured for driving connection with the differential 8. This allows power transmitted to the output shaft 3 to be transferred to the differential 8 via the output gear 7. Preferably, the output gear 7 is located on the output shaft 3 near the input shaft 1, making the overall structure compact, occupying less space, and facilitating overall layout.

[0066] It should be noted that, in this embodiment, the first synchronizer 13 is preferably an existing bidirectional synchronizer, and the second synchronizer 14 is preferably an existing unidirectional synchronizer.

[0067] The power transmission device of this embodiment connects the ring gear 403 to the first synchronizer 13, engages the ring gear 403 through the first synchronizer 13, and engages the synchronous gear 16, thereby braking the ring gear 403, so that the power of the input shaft 1 can be transmitted to the intermediate shaft 2 through the planetary carrier 402, the planetary gear 404, and the sun gear 401, and then transmitted to the output shaft 3 through the first transmission unit.

[0068] By selectively engaging the second transmission unit through the second synchronizer 14, the power between the intermediate shaft 2 and the output shaft 3 can be connected or disconnected as needed. When the input shaft 1 and the intermediate shaft 2 are matched with different power sources, the two power sources can output power separately or together. When one power source is working, there is no need to drag the other working source, which facilitates the realization of multiple driving modes. Under different driving conditions, the driving mode can be reasonably selected to improve the vehicle's economy, driving performance and power performance.

[0069] Meanwhile, this embodiment also relates to a power assembly, comprising the above-mentioned power transmission device and a power source, wherein the power output end of the power source is in transmission connection with the power transmission device.

[0070] Still refer to Figure 1 or Figure 2 As shown, as a preferred embodiment, the power source of this embodiment includes an engine 10, with the power output end of engine 10 drivingly connected to input shaft 1. In the preferred embodiment, the power output end of engine 10 is directly connected to input shaft 1, eliminating the need for a clutch and thus reducing the weight and cost of the powertrain. It should be understood that in addition to a direct connection between the power output end of engine 10 and input shaft 1, other structures can be provided between the two, such as a conventional clutch, referring to existing technologies. This will not be described in detail here.

[0071] Still refer to Figure 1 or Figure 2 As shown, as a preferred embodiment, the power source of this embodiment further includes a first motor 9, and the power output end of the first motor 9 is transmission-connected to the intermediate shaft 2. The transmission connection referred to herein includes a direct connection between the power output end of the first motor 9 and the intermediate shaft 2, and a connection between the power output end of the first motor 9 and the intermediate shaft 2 via other power-transmitting structures, such as a gear train.

[0072] When the power source includes both the engine 10 and the first motor 9 , the power transmission method thereof still refers to the above description.

[0073] The powertrain of this embodiment, by applying the above power transmission device, not only has the same technical effects as the power transmission device relative to the prior art, but also has the advantages of simple structure and light weight.

[0074] The above powertrain can realize multiple modes including pure electric, engine 10 direct drive, E-CVT, and extended range, making it convenient for users to switch the driving mode according to different working conditions.

[0075] Figure 1 The driving modes achievable by the powertrain shown are shown in Table 1.

[0076] Table 1:

[0077] Working Mode engine GM S1 left S1 S1 right S2 Left S2 Engine direct drive √ √ √ E-CVT √ √ √ √ EV √ √ √ Extended range √ √ √ √

[0078] As shown in the above table, "GM" represents the first motor 9, "S1 left" represents that the first synchronizer 13 is engaged with the first driving wheel 5, "S1 center" represents that the first synchronizer 13 is in the middle position and is not engaged with the first driving wheel 5 and the synchronous gear 16, "S1 right" represents that the first synchronizer 13 is engaged with the synchronous gear 16, "S2 left" represents that the second synchronizer 14 is engaged with the second driven wheel 12, "S2 center" represents that the second synchronizer 14 is disconnected from the second driven wheel 12, and "√" represents that the corresponding components are in working condition.

[0079] In each working mode, the power transmission path is as follows:

[0080] 1. Engine 10 Direct Drive Mode: S1 is engaged on the right side and S2 is engaged on the left side, enabling direct drive of engine 10. Engine 10 drives sun gear 401 via planetary carrier 402. Power is transmitted through second driving gear 11, second driven gear 12, and output gear 7 to differential 8, where it is output.

[0081] 2. E-CVT Mode: Engage S1 on the left side and disengage S2 in the middle position to enable E-CVT. Engine 10 drives sun gear 401 via planetary carrier 402, generating power through first motor 9. Simultaneously, power is transmitted through ring gear 403, first driving gear 5, first driven gear 6, and output gear 7 to differential 8, where it is output. In E-CVT mode, power is fed back to engine 10 to start the vehicle, facilitating power-fed all-wheel drive (AWD) escape.

[0082] 3. EV Mode: With S1 in the middle position and S2 engaged on the left, EV mode is achieved. The first motor 9 transmits power to the differential 8 via the second driving wheel 11, the second driven wheel 12, and the output gear 7. The differential 8 then outputs power.

[0083] 4. Range Extender Mode: S1 is engaged on the right side and S2 is in the middle position to achieve range extension. The engine 10 drives the sun gear 401 through the planetary carrier 402, and the first motor 9 generates electricity.

[0084] Figure 2 The driving modes achievable by the powertrain shown are shown in Table 2.

[0085] Table 2:

[0086] Working Mode engine GM S1 left S1 S1 right S2 Left S2 Engine direct drive √ √ √ E-CVT √ √ √ √ EV √ √ √ Extended range √ √ √ √

[0087] As shown in the table above, "GM" represents the first motor 9, "S1 left" represents that the first synchronizer 13 is engaged with the synchronous gear 16, "S1 center" represents that the first synchronizer 13 is in the middle position and is not engaged with the first driving wheel 5 and the synchronous gear 16, "S1 right" represents that the first synchronizer 13 is engaged with the first driving wheel 5, "S2 left" represents that the second synchronizer 14 is engaged with the second driven wheel 12, "S2 center" represents that the second synchronizer 14 is disconnected from the second driven wheel 12, and "√" represents that the corresponding components are in working condition.

[0088] Example 2

[0089] This embodiment relates to a power transmission device, which has substantially the same structure as the power transmission device of the first embodiment, such as Figure 3 As shown in , the main difference between the power transmission device of this embodiment and the power transmission device of the first embodiment is that the ring gear 403 is connected to the first driving wheel 5, and the first synchronizer 13 at this time can adopt the existing one-way synchronizer.

[0090] In a preferred embodiment, the intermediate shaft 2 includes a first intermediate shaft 201 and a second intermediate shaft 202, the sun gear 401 is arranged on the first intermediate shaft 201, the second intermediate shaft 202 is used for transmission connection with the power source, the first driving wheel 5 is loosely mounted on the first intermediate shaft 201, and the first synchronizer 13 is arranged on the ring gear 403.

[0091] It should be noted that the first synchronizer 13 is provided on the ring gear 403 is only a preferred embodiment. In addition, for example, Figure 2 The structure shown in , in which a hollow shaft is provided and the first synchronizer 13 is provided on the hollow shaft, is also feasible.

[0092] In a preferred embodiment, the first transmission unit includes a first driven gear 6 loosely mounted on the output shaft 3, with the first driving gear 5 meshingly connected to the first driven gear 6. The second transmission unit includes a second driving gear 11 fixedly mounted on the second intermediate shaft 202, and a second driven gear 12 loosely mounted on the output shaft 3, with the second driving gear 11 meshingly connected to the second driven gear 12. A second synchronizer 14 is provided on the output shaft 3, selectively connected to the first driven gear 6, and selectively connected to the second driven gear 12.

[0093] It should be noted that when the second synchronizer 14 is engaged with the first driven wheel 6, the power on the first driving wheel 5 can be transmitted to the output shaft 3 through the first driven wheel 6, and when the second synchronizer 14 is disconnected from the first driven wheel 6, the power on the first driving wheel 5 cannot be transmitted to the output shaft 3.

[0094] In this embodiment, the structure of the first transmission unit and the structure of the second transmission unit are the same as those in the first embodiment, and the achievable effects and power transmission paths are still described in the first embodiment.

[0095] In order to increase the gear mode, as a preferred embodiment, continue to refer to Figure 3 As shown, the first intermediate shaft 201 is provided with a third synchronizer 15 , and the third synchronizer 15 is selectively connected to the first driving wheel 5 , and the third synchronizer 15 is selectively connected to the second driving wheel 11 .

[0096] When the third synchronizer 15 is engaged with the second driving gear 11, the power on the second intermediate shaft 202 is coupled to the power on the first intermediate shaft 201. When the third synchronizer 15 is engaged with the first driving gear 5, the sun gear 401 and the ring gear 403 rotate synchronously. When the third synchronizer 15 is not engaged with either the first driving gear 5 or the second driving gear 11, the power on the first intermediate shaft 201 is transmitted to the output shaft 3, and the power on the second intermediate shaft 202 is transmitted to the output shaft 3, without affecting each other, thus facilitating energy conservation.

[0097] In the above structure, the ring gear 403 of the first synchronizer 13 is connected to the first driving wheel 5, and the third synchronizer 15 is provided, which can increase the number of gears and facilitate users to select the appropriate gear. After the power transmission device is assembled with the power source, the economy and drivability of the powertrain application can be improved.

[0098] This embodiment also relates to a power assembly, which has substantially the same structure as the power assembly of the first embodiment, with the difference being that the power assembly of this embodiment uses the power drive device of this embodiment.

[0099] Figure 3 The driving modes achievable by the powertrain shown are shown in Table 3.

[0100] Table 3:

[0101]

[0102] As shown in the above table, "GM" represents the first motor 9, "S1 left" represents that the first synchronizer 13 is disconnected from the synchronous gear 16, "S1 right" represents that the first synchronizer 13 is disconnected from the synchronous gear 16, "S2 left" represents that the second synchronizer 14 is engaged with the second driven wheel 12, "S2 center" represents that the second synchronizer 14 is disconnected from the second driven wheel 12, and the second synchronizer 14 is disconnected from the first driven wheel 6, "S2 right" represents that the second synchronizer 14 is engaged with the first driven wheel 6, "S3 left" represents that the third synchronizer 15 is engaged with the second driving wheel 11, "S3 center" represents that the third synchronizer 15 is disconnected from the second driving wheel 11, and the third synchronizer 15 is disconnected from the first driving wheel 5, "S3 right" represents that the third synchronizer 15 is engaged with the first driving wheel 5, and "√" represents that the corresponding components are in working condition.

[0103] The technical effects of the powertrain of this embodiment compared to the prior art are still described in the first embodiment and will not be described in detail here.

[0104] Example 3

[0105] This embodiment relates to a vehicle equipped with the powertrain of Embodiment 1 or 2, and further comprising a second motor. In the vehicle of this embodiment, the power output terminal of the powertrain of Embodiment 1 or 2 is drivingly connected to one drive axle of the vehicle, and the power output terminal of the second motor is drivingly connected to the other drive axle of the vehicle.

[0106] In a preferred embodiment, the powertrain of Example 1 or Example 2 is used to drive the front drive axle of the vehicle, and the second motor is used to drive the rear drive axle of the vehicle. The connection method between the second motor and the rear drive axle can refer to the structure in the prior art. In addition, the second motor can also be a hub motor to directly drive the rear wheels of the vehicle.

[0107] The vehicle of this embodiment has a four-wheel drive hybrid architecture, and the front drive axle has EV (Electric Vehicle, pure electric vehicle), engine 10 direct drive, E-CVT, and extended range multi-mode free switching. The vehicle's four-wheel drive can be started when power is supplied. It is suitable for PHEV models (plug-in hybrid vehicles) and can meet the driving needs of muddy roads, climbing slopes, and power-supplying four-wheel drive to get out of trouble.

[0108] The vehicle of this embodiment, like the aforementioned power transmission device and power assembly, has the same beneficial effects as those of the prior art, which will not be described in detail here.

[0109] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A power transmission device, characterized in that: It includes an input shaft (1), a planetary gear train (4), an intermediate shaft (2), a first synchronizer (13), a second synchronizer (14) and an output shaft (3); The planet carrier (402) of the planetary gear train (4) is arranged on the input shaft (1), the sun gear (401) of the planetary gear train (4) is arranged on the intermediate shaft (2), and the ring gear (403) of the planetary gear train (4) is in transmission connection with the first synchronizer (13); A first driving wheel (5) is mounted on the intermediate shaft (2), a synchronous gear (16) is provided on the housing of the power transmission device, the first synchronizer (13) is connected to the first driving wheel (5), and the first synchronizer (13) is selectively connected to the synchronous gear (16), and the first driving wheel (5) is connected to the output shaft (3) through a first transmission unit. A second transmission unit is provided between the intermediate shaft (2) and the output shaft (3); the second synchronizer (14) is provided on the intermediate shaft (2) or the output shaft (3); the second synchronizer (14) selectively connects to the second transmission unit, and enables transmission connection between the intermediate shaft (2) and the output shaft (3).

2. The power transmission device according to claim 1, characterized in that: The second transmission unit comprises a second driving wheel (11) fixed on the intermediate shaft (2), and a second driven wheel (12) loosely sleeved on the output shaft (3), wherein the second driving wheel (11) and the second driven wheel (12) are meshed and connected; The second synchronizer (14) is provided on the output shaft (3) and selectively connected to the second driven wheel (12).

3. The power transmission device according to claim 2, characterized in that: The first transmission unit comprises a first driven wheel (6) provided on the output shaft (3), and the first driving wheel (5) and the first driven wheel (6) are meshed and connected; The first synchronizer (13) is provided on the ring gear (403), and the first synchronizer (13) is selectively connected to the first driving wheel (5).

4. The power transmission device according to claim 2, characterized in that: The intermediate shaft (2) is provided with a hollow shaft connected to the ring gear (403), the first driving wheel (5) is also sleeved on the hollow shaft, the first synchronizer (13) is provided on the hollow shaft, and the first synchronizer (13) is selectively connected to the first driving wheel (5); The first transmission unit comprises a first driven wheel (6) fixed on the output shaft (3), and the first driving wheel (5) and the first driven wheel (6) are meshed and connected.

5. The power transmission device according to claim 1, wherein: The intermediate shaft (2) includes a first intermediate shaft (201) and a second intermediate shaft (202), and the sun gear (401) is arranged on the first intermediate shaft (201); The first driving wheel (5) is loosely mounted on the first intermediate shaft (201) and is connected to the ring gear (403) to form an integral structure. The first synchronizer (13) is provided on the ring gear (403). The first transmission unit includes a first driven wheel (6) loosely mounted on the output shaft (3). The first driving wheel (5) and the first driven wheel (6) are meshed and connected.

6. The power transmission device according to claim 5, characterized in that: The second transmission unit comprises a second driving wheel (11) fixed on the second intermediate shaft (202), and a second driven wheel (12) loosely sleeved on the output shaft (3), wherein the second driving wheel (11) and the second driven wheel (12) are meshed and connected; a second synchronizer (14) is provided on the output shaft (3), the second synchronizer (14) is selectively connected to the first driven wheel (6), and the second synchronizer (14) is selectively connected to the second driven wheel (12); A third synchronizer (15) is provided on the first intermediate shaft (201), and the third synchronizer (15) is selectively connected to the first driving wheel (5), and the third synchronizer (15) is selectively connected to the second driving wheel (11).

7. The power transmission device according to any one of claims 1 to 6, characterized in that: An output gear (7) is provided on the output shaft (3), and the output gear (7) is used for transmission connection with a differential (8).

8. A powertrain, characterized in that: The power transmission device according to any one of claims 1 to 7, further comprising a power source; The power output end of the power source is transmission-connected to the power transmission device.

9. The powertrain according to claim 8, characterized in that: The power source comprises an engine (10) and a first motor (9), wherein the power output end of the engine (10) is transmission-connected to the input shaft (1), and the power output end of the first motor (9) is transmission-connected to the intermediate shaft (2).

10. A vehicle, characterized in that: A powertrain according to any one of claims 8 to 9, further comprising a second motor; The power output end of the power assembly is transmission-connected to one drive axle of the vehicle, and the power output end of the second motor is transmission-connected to the other drive axle of the vehicle.

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