Power transmission system and vehicle having the same

Abstract

The application provides a power transmission system and a vehicle with the same, and relates to the technical field of power transmission. The power transmission system comprises a driving motor, a planetary gear train, an output end of the planetary gear train being connected with an output end of the driving motor, and an output end of the planetary gear train outputting power through a transmission mechanism, the planetary gear train being capable of outputting driving force through any one of a ring gear and a planet carrier; the transmission mechanism comprises an output shaft for outputting driving force, the output shaft being provided with a first reduction gear and a second reduction gear, the first reduction gear being in transmission connection with an output end of the ring gear, the second reduction gear being in transmission connection with an output end of the planet carrier, and the first reduction gear and the second reduction gear being coaxially arranged; wherein the planetary gear train can select to transmit driving force to the first reduction gear through the ring gear or to transmit driving force to the second reduction gear through the planet carrier. The scheme solves the problems of complex structure and high cost of the transmission system in the prior art.

Description

Technical Field

[0001] This invention relates to the field of power transmission technology, and more specifically, to a power transmission system and a vehicle having the same. Background Technology

[0002] Currently, domestic and international new energy heavy-duty commercial vehicle electric drive systems offer various technical solutions, including single motor + 2-speed gearbox, single motor + 4-speed gearbox, single motor + 6-speed gearbox, dual motor + 2-speed gearbox, dual motor + 4-speed gearbox, dual motor + 6-speed gearbox, and single motor + heavy-duty multi-speed gearbox. With the increasing production of new energy electric drive vehicles, users have a stronger demand for low-cost and lightweight electric drive system assemblies. As motor technology continues to advance, electric drive systems are developing towards fewer gears, while simultaneously requiring simplified structures to achieve lightweighting and lower costs.

[0003] There is currently no effective solution to the aforementioned technical problems. Summary of the Invention

[0004] The main objective of this invention is to provide a power transmission system and a vehicle having the same, so as to solve the problems of complex structure and high cost of transmission systems in the prior art.

[0005] To achieve the above objectives, according to one aspect of the present invention, a power transmission system is provided, comprising: a drive motor; a planetary gear train, wherein the input end of the planetary gear train is connected to the output end of the drive motor, and the output end of the planetary gear train outputs power through a transmission mechanism, and the planetary gear train can output driving force through either a ring gear or a planet carrier; the transmission mechanism includes an output shaft for outputting driving force, and a first reduction gear and a second reduction gear are disposed on the output shaft, the first reduction gear being drive-connected to the output end of the ring gear, and the second reduction gear being drive-connected to the output end of the planet carrier, the first reduction gear and the second reduction gear being coaxially disposed; wherein the planetary gear train can selectively transmit driving force to the first reduction gear through the ring gear, or to the second reduction gear through the planet carrier.

[0006] Furthermore, the power transmission system also includes: a housing, which encloses a cavity, and has an inlet and an outlet. The planetary gear train and the transmission mechanism are both located within the cavity. The input end of the planetary gear train passes through the inlet and connects to the output end of the drive motor. The output end of the transmission mechanism passes through the outlet to output power. A baffle is provided on the inner wall of the housing, which extends circumferentially to divide the cavity into two chambers. The planetary gear train and the transmission mechanism are located in two different chambers. A connecting hole is provided on the baffle, through which the planetary gear train and the transmission mechanism are connected.

[0007] Furthermore, the planetary gear train includes: a driving gear, which is coaxially arranged with the sun gear and both the driving gear and the sun gear are connected to the output end of the drive motor; and a first shifting mechanism, which is connected to the housing and is used to adjust the output end of the planetary gear train to output power through any one of the driving gear, the ring gear, and the planet carrier.

[0008] Furthermore, the first shifting mechanism includes: a fixed coupling sleeve, one end of which is connected to the inner wall of the housing; and a first shifting slide sleeve, which is movably disposed within the receiving cavity. The first shifting slide sleeve has a first-gear drive position connecting the gear ring to the fixed coupling sleeve, or a second-gear drive position connecting the planetary gears to the fixed coupling sleeve, or a third-gear drive position connecting the planetary gears to the drive gear. When the first shifting slide sleeve is in the first-gear drive position or the second-gear drive position, the planetary gear system performs a first-stage power reduction; when the first shifting slide sleeve is in the third-gear drive position, the planetary gear system does not perform power reduction.

[0009] Furthermore, the transmission mechanism also includes: a shift shaft, which is connected to the output end of the planetary carrier, and a shift gear and a transmission gear are provided on the shift shaft. The shift gear is connected to the shift shaft, and the transmission gear is sleeved on the shift shaft and is connected to the second reduction gear. The second shift mechanism is connected to the housing and is used to adjust the connection and disconnection between the shift gear and the transmission gear.

[0010] Furthermore, the second shifting mechanism includes: a second shifting sleeve, which is movably disposed within a receiving cavity, the second shifting sleeve having a first position for connecting the shifting gear and the transmission gear, and a second position for neutral, wherein when the second shifting sleeve is in the first position, the shifting gear and the transmission gear are used to transmit the driving force on the planetary carrier to the second reduction gear.

[0011] Furthermore, the power transmission system has a first gear mode. When the power transmission system is in first gear mode, the first shift sleeve is in the first gear drive position, the second shift sleeve is in the first position, and the driving force of the drive motor is output from the output port after two-stage reduction.

[0012] Furthermore, the power transmission system has a two-speed mode. When the power transmission system is in the two-speed mode, the first shift sleeve is in the second-speed drive position, the second shift sleeve is in the second position, and the driving force of the drive motor is output from the output port after two-stage reduction.

[0013] Furthermore, the power transmission system has three gear modes. When the power transmission system is in three gear mode, the first shift sleeve is in the third gear drive position, the second shift sleeve is in the first position, and the driving force of the drive motor is output from the output port after a first-stage reduction.

[0014] According to another aspect of the present invention, a vehicle is provided, the vehicle having a power transmission system, the power transmission system being the aforementioned power transmission system.

[0015] By employing the technical solution of this invention, a planetary gear train and transmission mechanism are used. The planetary gear train can reduce the driving force output by the drive motor to a single stage before selecting whether to output it via a ring gear or a planet carrier. A first reduction gear and a second reduction gear are mounted on the output shaft of the transmission mechanism. The first reduction gear is connected to the output end of the ring gear. When the planetary gear train outputs driving force through the ring gear, the driving force is transmitted from the ring gear to the output shaft, undergoing a single stage of reduction via the first reduction gear. The second reduction gear is connected to the output end of the planet carrier. When the planetary gear train outputs driving force through the planet carrier, the driving force is transmitted from the planet carrier to the output shaft, undergoing a single stage of reduction via the second reduction gear. Thus, only one planetary gear train and transmission mechanism are required between the drive motor and the output shaft. The transmission mechanism uses a parallel shaft transmission method, achieving a maximum of two-stage reduction in driving force output. This allows for a fewer-gear development of the power transmission system, requires less overall space, and achieves overall system lightweighting and low cost, satisfying both power requirements and economic efficiency. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0017] Figure 1 A schematic diagram of an embodiment of the power transmission system according to the present invention is shown;

[0018] Figure 2 A schematic diagram of the power transmission path in a first-gear mode embodiment of the power transmission system according to the present invention is shown;

[0019] Figure 3 A schematic diagram of the power transmission path in a two-speed mode embodiment of the power transmission system according to the present invention is shown;

[0020] Figure 4 A schematic diagram of the power transmission path is shown in an embodiment of the three-speed mode of the power transmission system according to the present invention.

[0021] The above figures include the following reference numerals:

[0022] 10. Drive motor;

[0023] 20. Planetary gear train;

[0024] 21. Gear ring;

[0025] 22. Planetary support;

[0026] 23. Drive gear;

[0027] 24. Sun Gear;

[0028] 25. First gear shifting mechanism;

[0029] 251. Fixed coupling sleeve;

[0030] 252. First shift sleeve;

[0031] 26. Planetary Gear;

[0032] 30. Transmission mechanism;

[0033] 31. Shift shaft;

[0034] 311. Gear shifter;

[0035] 312. Transmission gears;

[0036] 32. Output shaft;

[0037] 321. First reduction gear;

[0038] 322. Second reduction gear;

[0039] 33. Second gear shifting mechanism;

[0040] 331. Second shift sleeve;

[0041] 34. Idle wheel;

[0042] 40. Shell;

[0043] 400. Receiving cavity;

[0044] 41. Input port;

[0045] 42. Output port;

[0046] 43. Baffle;

[0047] 430. Connecting hole. Detailed Implementation

[0048] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0049] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0050] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0051] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and therefore their description will be omitted.

[0052] Combination Figures 1 to 4 As shown, according to a specific embodiment of this application, a power transmission system is provided.

[0053] Specifically, such as Figure 1As shown, the power transmission system includes a drive motor 10, a planetary gear train 20, and a transmission mechanism 30. The input end of the planetary gear train 20 is connected to the output end of the drive motor 10, and the output end of the planetary gear train 20 outputs power through the transmission mechanism 30. The planetary gear train 20 can output driving force through either the ring gear 21 or the planet carrier 22. The transmission mechanism 30 includes an output shaft 32 for outputting driving force. A first reduction gear 321 and a second reduction gear 322 are provided on the output shaft 32. The first reduction gear 321 is connected to the output end of the ring gear 21, and the second reduction gear 322 is connected to the output end of the planet carrier 22. The first reduction gear 321 and the second reduction gear 322 are coaxially arranged. The planetary gear train 20 can selectively transmit driving force to the first reduction gear 321 through the ring gear 21, or to the second reduction gear 322 through the planet carrier 22.

[0054] By using the technical solution of this embodiment, the planetary gear train 20 and the transmission mechanism 30 can reduce the driving force output by the drive motor 10 by one stage and then select the output to be sent to the ring gear 21 or the planet carrier 22. The output shaft 32 of the transmission mechanism 30 is provided with a first reduction gear 321 and a second reduction gear 322. The first reduction gear 321 is connected to the output end of the ring gear 21. When the planetary gear train 20 outputs driving force through the ring gear 21, the driving force is transmitted from the ring gear 21 to the output shaft 32, and the first reduction gear 321 can reduce the driving force by one stage. The second reduction gear 322 is connected to the output end of the planet carrier 22. When the planetary gear train 20 outputs driving force through the planet carrier 22, the driving force is transmitted from the planet carrier 22 to the output shaft 32, and the second reduction gear 322 can reduce the driving force by one stage. In this way, only one planetary gear train 20 and a transmission mechanism 30 are set between the drive motor 10 and the output shaft 32. The transmission mechanism 30 adopts a parallel shaft transmission method, which can achieve a maximum two-stage reduction output of driving force. This enables the power transmission system to develop in the direction of fewer gears, requires less overall space, and can also achieve overall system lightweighting and low cost, satisfying both power performance and economy.

[0055] Specifically, such as Figure 1As shown, the power transmission system also includes a housing 40, which forms a receiving cavity 400. The housing 40 has an input port 41 and an output port 42. The planetary gear train 20 and the transmission mechanism 30 are both located in the receiving cavity 400. The input end of the planetary gear train 20 passes through the input port 41 and is connected to the output end of the drive motor 10. The output end of the transmission mechanism 30 passes through the output port 42 to output power. A baffle 43 is provided on the inner wall of the housing 40. The baffle 43 extends circumferentially along the housing 40 to divide the receiving cavity 400 into two chambers. The planetary gear train 20 and the transmission mechanism 30 are located in two different chambers. A connecting hole 430 is provided on the baffle 43, through which the planetary gear train 20 and the transmission mechanism 30 are connected. The transmission structure of the power transmission system is set within the housing 400 enclosed by the housing 40. The output end of the drive motor 10 is connected to the planetary gear train 20 through the input port 41, while the output end of the output shaft 32 outputs driving force through the output port 42. A baffle 43 is set on the inner wall of the middle part of the housing 400, dividing the housing 400 into two chambers, front and rear. An input port 41 is opened on one side inner wall of the front chamber, and the planetary gear train 20 is installed in the front chamber. An output port 42 is opened on one side inner wall of the rear chamber, and the transmission mechanism 30 is installed in the rear chamber. The front chamber and the rear chamber are connected by a connecting hole 430 opened on the baffle 43. This arrangement helps to isolate the working environment of the planetary gear train 20 and the transmission mechanism 30, allows for separate management of the lubrication and cooling systems, improves the reliability of the entire electric drive box (housing 40), and makes the power transmission system more compact.

[0056] Furthermore, such as Figure 1 As shown, the planetary gear train 20 also includes a drive gear 23 and a first shifting mechanism 25. The drive gear 23 is coaxially arranged with the sun gear 24, and both the drive gear 23 and the sun gear 24 are connected to the output end of the drive motor 10. The first shifting mechanism 25 is connected to the housing 40 and is used to adjust the output end of the planetary gear train 20 to output power through any one of the drive gear 23, the ring gear 21, and the planet carrier 22. The drive gear 23 is coaxially arranged with the sun gear 24 and connected to the output end of the drive motor 10, so that the two can rotate together to receive the torque of the drive motor 10. Since the drive gear 23 is additionally set on the output end of the drive motor 10, the planetary gear train 20 can directly output the driving force to the transmission mechanism 30 without the planetary gear reduction through the drive gear 23. The first shifting mechanism 25 can adjust the output mode of the planetary gear train 20, so that it can switch the power output end according to the working conditions, that is, selectively output the power to the transmission mechanism 30 through the drive gear 23, the ring gear 21 or the planet carrier 22, automatically adjust the driving mode, and improve the adaptability and economy of the power transmission system.

[0057] Specifically, the first shifting mechanism 25 includes a fixed coupling sleeve 251 and a first shifting slide sleeve 252. One end of the fixed coupling sleeve 251 is connected to the inner wall of the housing 40. The first shifting slide sleeve 252 is movably disposed in the receiving cavity 400. The first shifting slide sleeve 252 has a first-gear drive position that connects the gear ring 21 to the fixed coupling sleeve 251, or a second-gear drive position that connects the planetary gear 26 to the fixed coupling sleeve 251, or a third-gear drive position that connects the planetary gear 26 to the drive gear 23. When the first shifting slide sleeve 252 is in the first-gear drive position or the second-gear drive position, the planetary gear system 20 performs first-level power reduction. When the first shifting slide sleeve 252 is in the third-gear drive position, the planetary gear system 20 does not perform power reduction. The fixed coupling sleeve 251 serves as a fixed part in the shifting mechanism, providing a stable foundation for the shifting process. The first shifting sleeve 252 connects the gear ring 21, planet carrier 22, and drive gear 23, or connects them to the fixed coupling sleeve 251. The fixed coupling sleeve 251 restricts the movement of the connected parts, thereby enabling the other part of the planetary gear train 20 to output driving force. The first shifting sleeve 252 is movably disposed within the receiving cavity 400, allowing both ends of the first shifting sleeve 252 to move flexibly between the gear ring 21, planet carrier 22, drive gear 23, and fixed coupling sleeve 251, achieving different power output modes.

[0058] In this embodiment, the first shift sleeve 252 has first gear, second gear and third gear drive positions. When the first shift sleeve 252 is in the first gear drive position, the two ends of the first shift sleeve 252 connect the gear ring 21 to the fixed coupling sleeve 251 respectively. At this time, the gear ring 21 is restricted by the fixed coupling sleeve 251 and no longer moves. The planetary gear system 20 outputs driving force through the planet carrier 22. During the transmission of driving force between the sun gear 24 and the planet gear 26, a first-stage power reduction will be performed. That is, the power after the first-stage reduction will be output through the planet carrier 22. It is suitable for low-speed and high-torque working conditions.

[0059] In this embodiment, when the first shift sleeve 252 is in the second gear drive position, the two ends of the first shift sleeve 252 connect the planetary gear 26 to the fixed coupling sleeve 251 respectively. At this time, the planetary gear 26 is restricted by the fixed coupling sleeve 251 so that the planet carrier 22 no longer moves. The planetary gear system 20 outputs driving force through the ring gear 21. During the transmission of driving force from the sun gear 24 to the ring gear 21, the power will be reduced, that is, the power after first-level reduction will be output through the ring gear 21. However, by adjusting the meshing method of the planetary gears, its transmission ratio is different from the first gear drive mode, and medium-speed driving conditions can be used.

[0060] In this embodiment, when the first shift sleeve 252 is in the third gear driving position, the two ends of the first shift sleeve 252 connect the planetary gear 26 and the drive gear 23 respectively. At this time, the driving force is directly transmitted from the output end of the drive motor 10 to the planet carrier 22 through the drive gear 23. The planetary gear system 20 outputs driving force through the planet carrier 22. However, at this time, there is no relative movement between the sun gear 24 and the planetary gear 26. The movement of the planet carrier 22 is directly transmitted by the drive gear 23. Therefore, there is no power deceleration at this time. That is, the power without deceleration is finally output through the planet carrier 22, which realizes the working condition requirements of high efficiency and low speed ratio when driving at high speed.

[0061] Furthermore, such as Figure 1 As shown, the transmission mechanism 30 also includes a shift shaft 31 and a second shift mechanism 33. The shift shaft 31 is connected to the output end of the planetary carrier 22. A shift gear 311 and a transmission gear 312 are mounted on the shift shaft 31. The shift gear 311 is connected to the shift shaft 31, and the transmission gear 312 is sleeved on the shift shaft 31, and the transmission gear 312 is connected to the second reduction gear 322. The second shift mechanism 33 is connected to the housing 40 and is used to adjust the connection and disconnection of the shift gear 311 and the transmission gear 312. The shift shaft 31 is directly connected to the output end of the planetary carrier 22 in the planetary gear train 20, becoming an important bridge for power transmission from the middle box to the rear box, simplifying the transmission path and ensuring the directness and efficiency of power transmission. The shift shaft 31 is equipped with two sets of gears: a shift gear 311 and a transmission gear 312. The shift gear 311 is normally fixed to the shift shaft 31, while the transmission gear 312 is sleeved on the shift shaft 31. Through the second shift mechanism 33, the shift gear 311 and the transmission gear 312 can be connected and disconnected. Thus, the power output from the planetary carrier 22 can be selectively transmitted to the transmission gear 312 through the shift gear 311, and then the driving force can be transmitted to the second reduction gear 322 through the transmission gear 312. That is, the path of power output is changed through the second shift mechanism 33.

[0062] In one embodiment of this application, the transmission mechanism 30 further includes an idler wheel 34, which meshes with the transmission gear 312 to transmit the power of the transmission gear 312 to the second reduction gear 322. The arrangement of the idler wheel 34 can optimize the layout of the transmission gear 312 and the shift gear 311, change the direction of power transmission, and make the spatial layout of the shift shaft 31, the output shaft 32, the shift gear 311, the transmission gear 312 and the second reduction gear 322 more compact and reasonable, occupying less space in the accommodating cavity 400, and achieving the compactness of the housing 40 and the lightweight layout requirements of the power transmission system.

[0063] Specifically, the second shifting mechanism 33 includes a second shifting sleeve 331, which is movably disposed within the receiving cavity 400. The second shifting sleeve 331 has a first position connecting the shifting gear 311 and the transmission gear 312, and a second position in neutral. When the second shifting sleeve 331 is in the first position, the shifting gear 311 and the transmission gear 312 are used to transmit the driving force on the planetary carrier 22 to the second reduction gear 322. By connecting or disconnecting the meshing teeth of the shifting gear 311 and the transmission gear 312, the second shifting sleeve 331 can transmit the power on the planetary carrier 22 to the second reduction gear 322 through the shifting gear 311 and the transmission gear 312, or not transmit the driving force. When the second shift sleeve 331 is in the first position, it connects the shift gear 311 and the transmission gear 312 to form a stable transmission chain. The driving force transmitted from the planetary carrier 22 is transmitted through the shift gear 311, the second shift sleeve 331, and the transmission gear 312, and finally to the second reduction gear 322, which further reduces the power and increases the torque, providing sufficient power support for the vehicle when driving at low or medium speeds.

[0064] In this embodiment, when the second shift sleeve 331 is in the second position, the second shift sleeve 331 is in the neutral position, the engagement teeth of the shift gear 311 and the transmission gear 312 are disconnected, the power cannot be transmitted from the planetary carrier 22 to the transmission gear 312, nor can it be transmitted to the second reduction gear 322. At this time, the driving force can only be transmitted through one path from the gear ring 21 to the first reduction gear 321.

[0065] In one exemplary embodiment of this application, such as Figure 2 As shown, the power transmission system has a first-gear mode. When the power transmission system is in first-gear mode, the first shift sleeve 252 is in the first-gear drive position, and the second shift sleeve 331 is in the first position. The driving force of the drive motor 10 is output from the output port 42 after two-stage reduction. When entering the first-gear mode, the first shift sleeve 252 moves to its first-gear drive position, connecting the gear ring 21 with the fixed coupling sleeve 251, activating the reduction and torque amplification function of the planetary gear train 20. That is, the power is transmitted from the drive motor 10 to the sun gear 24, and then through the interaction of the planetary gear 26 between the gear ring 21 and the planet carrier 22, a first-stage power reduction is achieved. At the same time, the second shift sleeve 331 is also adjusted to the first position, connecting the shift gear 311 with the transmission gear 312, so that the driving force on the planet carrier 22 is finally reduced again through the second reduction gear 322 and transmitted to the output shaft 32.

[0066] It should be noted that in first gear mode, the power undergoes two reduction processes. First, the planetary gear train 20 performs a first-stage reduction of the driving force to significantly increase torque. Second, the shift gear 311 and transmission gear 312 in the transmission mechanism 30 work together to transmit power to the second reduction gear 322 for a second-stage reduction. This two-stage reduction design significantly improves the vehicle's traction at low speeds or during start-up, meeting the demand for strong starting performance in heavy commercial vehicles.

[0067] In another embodiment of this application, such as Figure 3 As shown, the power transmission system has a two-speed mode. When the power transmission system is in the second-speed mode, the first shift sleeve 252 is in the second-speed drive position, and the second shift sleeve 331 is in the second position. The driving force of the drive motor 10 is output from the output port 42 after two-stage reduction. In the second-speed mode, the first shift sleeve 252 is moved to the second-speed drive position, connecting the planetary gear 26 with the fixed coupling sleeve 251, changing the internal power distribution of the planetary gear train 20. This causes the sun gear 24 of the planetary gear train 20 to transmit power to the ring gear 21 for first-stage reduction, and then output driving force through the ring gear 21. At the same time, the second shift sleeve 331 is adjusted to the second position neutral. Since the planet carrier 22 does not rotate at this time, the shift shaft 31 and the shift gear 311 do not rotate. The power is transmitted to the first reduction gear 321 through the output end of the ring gear 21 to achieve first-stage reduction. The overall second-speed mode still achieves two-stage reduction, which is suitable for medium-speed driving conditions.

[0068] In another embodiment of this application, such as Figure 4 As shown, the powertrain system has three modes. When the powertrain system is in three-speed mode, the first shift sleeve 252 is in the third-speed drive position, and the second shift sleeve 331 is in the first position. The driving force of the drive motor 10 is output from the output port 42 after a first-stage reduction. When the powertrain system enters the third-speed mode, the first shift sleeve 252 moves to its third-speed drive position. At this time, there is no relative movement between the sun gear 24 and the planetary gears 26. The drive gear 23 directly transmits power to the planet carrier 22, which outputs a drive force without reduction. At the same time, the second shift sleeve 331 is set back to the first position, that is, the shift gear 311 is connected to the transmission gear 312, maintaining the continuity of the transmission chain and ensuring that the power can smoothly pass through the shift shaft 31 and finally be transmitted to the second reduction gear 322 for a first-stage reduction before output. This direct output method avoids additional reduction stages, allowing the vehicle to maintain a high driving speed with low energy consumption at high speeds.

[0069] According to another specific embodiment of this application, a vehicle is also provided, which has a power transmission system, the power transmission system described in the above embodiment. Applying the above power transmission system to a vehicle achieves efficient utilization of vehicle power and flexible adjustment of speed ratios. The vehicle's transmission mechanism, through connection with the drive motor 10, can realize different driving modes, thereby adapting to different driving conditions, improving vehicle driving performance, reducing energy consumption, and enhancing economy.

[0070] This application also provides a preferred embodiment of a powertrain system, which has a simplified structure, is lightweight and low-cost, performs better than a two-speed electric drive gearbox, and meets the power and economy requirements of the vehicle.

[0071] Specifically, the power transmission system consists of a three-speed electric drive box, including a drive motor 10, a drive gear 23, a sun gear 24, planet gears 26, a planet carrier 22, a gear ring 21, a first shift sleeve 252, a fixed coupling sleeve 251, a baffle 43, a housing 40, a second shift sleeve 331, a shift shaft 31, an output shaft 32, a first shift mechanism 25, and a second shift mechanism 33. The rotor shaft of the drive motor 10 is connected to the input shaft of the planetary gear train 20 via internal and external splines. The input shaft of the planetary gear train 20 is fixedly connected to the drive gear 23 (via spline, welding, or an integral shaft) and to the sun gear 24 (integral shaft or spline connection). The sun gear 24 meshes with the planet gears 26. The planet gears 26 are mounted on the planet carrier shaft via needle roller bearings. The planet gears 26 mesh with the internal teeth of the gear ring 21. An input gear is mounted on the output end of the gear ring 21. The input gear meshes with the first reduction gear 321. The first reduction gear 321 is fixedly connected to the output shaft 32. The output shaft 32 is fixedly connected to the output flange via the output port 42.

[0072] The rear output end of the planetary carrier 22 is connected to the shift shaft 31. The shift shaft 31 is splinedly connected to the shift gear 311. The transmission gear 312 is mounted on the shift shaft 31 through a needle roller bearing. The transmission gear 312 meshes with the idler gear 34. The idler gear 34 meshes with the second reduction gear 322. The second reduction gear 322 is fixedly connected to the output shaft 32.

[0073] The first shift mechanism 25 drives the first shift sleeve 252 to move and stop via the shift fork. When the first shift sleeve 252 is in neutral, the spline inside the first shift sleeve 252 is connected to the front gear seat on the planetary carrier 22 via the spline. The second shift mechanism 33 drives the second shift sleeve 331 to move or stop via the shift fork. When the second shift sleeve 331 is in neutral, the second shift sleeve 331 is connected to the shift gear 311 via the spline.

[0074] When the electric drive unit needs to be in first gear, such as Figure 2As shown, the second shifting mechanism 33 drives the inner spline of the second shifting sleeve 331 to mesh with the transmission gear 312 via the shift fork. The first shifting mechanism 25 drives the first shifting sleeve 252 to move backward via the shift fork, so that the outer spline of the first shifting sleeve 252 meshes with the inner spline on the fixed coupling sleeve 251. At the same time, the inner spline of the first shifting sleeve 252 meshes with the outer spline of the gear ring 21. At this time, the gear ring 21 is fixed, and the power of the drive motor 10 is transmitted to the sun gear 24 through the input end. After being reduced by the planetary gear train 20, it is output from the planet carrier 22. The planet carrier 22 drives the transmission gear 312 to rotate through the shift shaft 31, the shift gear 311, and the second shifting sleeve 331, and then outputs through the idler gear 15, the second reduction gear 322, the output shaft 32, and the output flange.

[0075] When the electric drive unit needs to be in second gear, such as Figure 3 As shown, the second shifting mechanism 33 drives the second shifting sleeve 331 back to the neutral position via the shift fork. The first shifting mechanism 25 drives the first shifting sleeve 252 forward via the shift fork, causing the outer spline of the first shifting sleeve 252 to mesh with the inner spline on the fixed coupling sleeve 251. At the same time, the inner spline of the first shifting sleeve 252 meshes with the gear seat of the planetary carrier 22. At this time, the planetary carrier 22 is fixed, and the power of the drive motor 10 is transmitted to the sun gear 24 through the input end. After being reduced by the planetary gear train 20, the power is output from the ring gear 21 and output through the ring gear 21, the input gear, the first reduction gear 321, the output shaft 32, and the output flange.

[0076] When the electric drive unit needs to be in third gear, such as Figure 4 As shown, the second shifting mechanism 33 drives the inner spline of the second shifting sleeve 331 to mesh with the transmission gear 312 via the shift fork. The first shifting mechanism 25 drives the first shifting sleeve 252 to move forward via the shift fork, so that the inner spline of the first shifting sleeve 252 simultaneously meshes with the drive gear 23 and the spline of the planetary carrier 22. At this time, there is no relative movement between the planetary carrier 22 and the sun gear 24. The power of the drive motor 10 drives the transmission gear 312 to rotate through the drive gear 23, planetary carrier 22, shift shaft 31, shift gear 311, and second shifting sleeve 331, and then outputs the power through the idler gear 15, second reduction gear 322, output shaft 32, and output flange.

[0077] As can be seen from the above description, the power transmission system in the above embodiments has the following beneficial effects:

[0078] 1) The power transmission system has a housing 40, and the transmission system is located in the receiving cavity 400 of the housing 40. It adopts a three-section housing structure of front, middle and rear, with a front housing, a middle housing and a rear housing. The transmission system is divided into a front box and a rear box, and the overall structure is more compact.

[0079] 2) A first shifting mechanism 25 and a second shifting mechanism 33 are adopted. The first shifting mechanism 25 corresponds to the sun gear 24 input to the planet carrier 22 output of the planetary gear train 20, and the sun gear 24 input to the ring gear 21 output, and direct output three deceleration and torque increase states; the second shifting mechanism 33 corresponds to the ring gear 21 input and the planet carrier 22 input two states.

[0080] 3) The planetary gear system with a 20-speed structure can achieve a large speed ratio and transmit large torque, while reducing the size of the transmission system and achieving lightweight and high efficiency.

[0081] 4) The transmission mechanism 30 adopts a parallel shaft gear structure, with single-machine gear reduction, which expands the speed ratio range of the system.

[0082] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0083] In addition to the above, it should be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this invention.

[0084] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0085] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A power transmission system, characterized in that, include: Drive motor (10); Planetary gear train (20), the input end of the planetary gear train (20) is connected to the output end of the drive motor (10), the output end of the planetary gear train (20) outputs power through the transmission mechanism (30), and the planetary gear train (20) can output driving force through any one of the gear ring (21) and the planet carrier (22); The transmission mechanism (30) includes an output shaft (32) for outputting the driving force. A first reduction gear (321) and a second reduction gear (322) are provided on the output shaft (32). The first reduction gear (321) is connected to the output end of the gear ring (21), and the second reduction gear (322) is connected to the output end of the planetary carrier (22). The first reduction gear (321) and the second reduction gear (322) are coaxially arranged. The planetary gear train (20) can selectively transmit the driving force to the first reduction gear (321) through the ring gear (21), or to the second reduction gear (322) through the planet carrier (22). The planetary gear train (20) includes: a first shifting mechanism (25), which is used to adjust the output end of the planetary gear train (20); A drive gear (23) is coaxially arranged with a sun gear (24), and both the drive gear (23) and the sun gear (24) are connected to the output end of the drive motor (10); the first shifting mechanism (25) includes: A fixed coupling sleeve (251) is provided, one end of which is connected to the inner wall of the housing (40) of the power transmission system; The first shift sleeve (252) has a first drive position connecting the gear ring (21) to the fixed coupling sleeve (251), or the first shift sleeve (252) has a second drive position connecting the planetary gear (26) to the fixed coupling sleeve (251), or the first shift sleeve (252) has a third drive position connecting the planetary gear (26) to the drive gear (23); the transmission mechanism (30) further includes: A shift shaft (31) is connected to the output end of the planetary carrier (22). A shift gear (311) and a transmission gear (312) are provided on the shift shaft (31). The shift gear (311) is connected to the shift shaft (31), and the transmission gear (312) is sleeved on the shift shaft (31). The transmission gear (312) is connected to the second reduction gear (322). The second shift mechanism (33) is used to adjust the connection and disconnection between the shift gear (311) and the transmission gear (312); The second shifting mechanism (33) includes: The second shift sleeve (331) has a first position for connecting the shift gear (311) and the transmission gear (312), and the second shift sleeve (331) has a second position in neutral. When the second shift sleeve (331) is in the first position, the shift gear (311) and the transmission gear (312) are used to transmit the driving force on the planetary carrier (22) to the second reduction gear (322).

2. The power transmission system according to claim 1, characterized in that, The housing (40) is configured to form a receiving cavity (400). The housing (40) has an input port (41) and an output port (42). The planetary gear train (20) and the transmission mechanism (30) are both located in the receiving cavity (400). The input end of the planetary gear train (20) passes through the input port (41) and is connected to the output end of the drive motor (10). The output end of the transmission mechanism (30) passes through the output port (42) to output power. A baffle (43) is provided on the inner wall of the housing (40). The baffle (43) extends along the circumference of the housing (40) to divide the receiving cavity (400) into two adjacent chambers. The planetary gear train (20) and the transmission mechanism (30) are located in two different chambers. A connecting hole (430) is provided on the baffle (43). The planetary gear train (20) and the transmission mechanism (30) are connected through the connecting hole (430).

3. The power transmission system according to claim 2, characterized in that, The planetary gear train (20) includes: The first shifting mechanism (25) is connected to the housing (40).

4. The power transmission system according to claim 3, characterized in that, The first shift sleeve (252) is movably disposed within the receiving cavity (400); When the first shift sleeve (252) is in the first gear drive position or the second gear drive position, the planetary gear system (20) performs first-level power deceleration; when the first shift sleeve (252) is in the third gear drive position, the planetary gear system (20) does not perform power deceleration.

5. The power transmission system according to claim 4, characterized in that, The second shifting mechanism (33) is connected to the housing (40).

6. The power transmission system according to claim 5, characterized in that, The second shift sleeve (331) is movably disposed within the receiving cavity (400).

7. The power transmission system according to claim 6, characterized in that, The power transmission system has a first gear mode. When the power transmission system is in the first gear mode, the first shift sleeve (252) is located in the first gear drive position, the second shift sleeve (331) is located in the first position, and the driving force of the drive motor (10) is output from the output port (42) after two-stage reduction.

8. The power transmission system according to claim 6, characterized in that, The power transmission system has a two-speed mode. When the power transmission system is in the two-speed mode, the first shift sleeve (252) is located in the second-speed driving position, the second shift sleeve (331) is located in the second position, and the driving force of the drive motor (10) is output from the output port (42) after two-stage reduction.

9. The power transmission system according to claim 6, characterized in that, The power transmission system has three gear modes. When the power transmission system is in the three gear modes, the first shift sleeve (252) is located in the three gear driving position, the second shift sleeve (331) is located in the first position, and the driving force of the drive motor (10) is output from the output port (42) after a first-level reduction.

10. A vehicle, characterized in that, The vehicle has a power transmission system, which is the power transmission system according to any one of claims 1-9.

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