Planetary row power system and vehicle

Abstract

This invention provides a planetary gear system and a vehicle, relating to the field of vehicle technology. The planetary gear system includes a drive unit, a first planetary gear set, a second planetary gear set, a first driveshaft, and a second driveshaft. In the first planetary gear set, one of the first sun gear, the second sun gear, and the first planet carrier constitutes a first input terminal, and the other two constitute first output terminals. In the second planetary gear set, one of the third sun gear, the fourth sun gear, and the second planet carrier constitutes a second input terminal, and the other two constitute second output terminals. The first input terminal is driven by the drive unit, the two first output terminals are driven by the first driveshaft and the second input terminal, respectively, and one of the two second output terminals is driven by the second driveshaft, while the other is connected to a stationary component of the planetary gear system. Thus, by using two tandem WW planetary gear sets to achieve an integrated differential reduction design, the power system structure becomes more compact and occupies less space.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and more specifically, to a planetary powertrain system and a vehicle. Background Technology

[0002] The reducer is a core component of a vehicle's powertrain and a key part of power output, directly affecting the powertrain's power output, overall vehicle performance, and torque-to-weight ratio. Traditional reducers employ a configuration of a main drive reduction system plus an independent differential assembly. The main drive reduction system typically uses a parallel shaft offset arrangement, a parallel shaft coaxial arrangement, or a planetary gear set coaxial arrangement. The differential usually uses a traditional straight bevel gear differential, a spiral bevel gear differential, or a lightweight straight bevel planetary gear set differential. This results in a large number of parts in the vehicle's powertrain, as well as a significant space occupation and overall weight, making layout difficult or impossible when space is limited. Summary of the Invention

[0003] The problem this invention addresses is: how to reduce the space occupied by the power system.

[0004] To address the above problems, the present invention provides a planetary power system and a vehicle.

[0005] In a first aspect, the present invention provides a planetary gear power system, including a drive component, a first planetary gear set, a second planetary gear set, a first drive shaft, and a second drive shaft;

[0006] The first planetary gear set includes a first sun gear, a second sun gear, a first planet gear set, and a first planet carrier. The first sun gear and the second sun gear are coaxially arranged and mesh with the first planet gear set respectively. One of the first sun gear, the second sun gear, and the first planet carrier constitutes the first input end of the first planetary gear set, and the other two constitute the first output end of the first planetary gear set respectively.

[0007] The second planetary gear set includes a third sun gear, a fourth sun gear, a second planetary gear set, and a second planetary carrier. The third sun gear and the fourth sun gear are coaxially arranged and mesh with the second planetary gear set respectively. One of the third sun gear, the fourth sun gear, and the second planetary carrier constitutes the second input end of the second planetary gear set, and the other two constitute the second output end of the second planetary gear set respectively.

[0008] The first input terminal is connected to the drive component, the two first output terminals are respectively connected to the first drive shaft and the second input terminal, one of the two second output terminals is connected to the second drive shaft, and the other is connected to the stationary component of the planetary power system.

[0009] The power output by the drive component is transmitted to the first planetary gear set via the first input end of the first planetary gear set and then splits into two paths. One path is transmitted sequentially through the first planetary gear set, the first output end connected to the first drive shaft, and then to the first drive shaft. The other path is transmitted sequentially through the first planetary gear set, the first output end of the first planetary gear set that is not connected to the first drive shaft, the second input end of the second planetary gear set, and then to the second planetary gear set. Finally, the power is transmitted sequentially through the second planetary gear set, the second output end of the second planetary gear set that is not connected to the stationary component, and then to the second drive shaft.

[0010] Optionally, one of the first sun gear and the second sun gear constitutes the first input terminal, and the second planetary carrier constitutes the second input terminal and is drive-connected to the first planetary carrier.

[0011] Optionally, the first planetary carrier and the second planetary carrier are integrally connected.

[0012] Optionally, the transmission ratio of the planetary power system is i. ,and ;

[0013] Where i1 is the ratio of the number of teeth of the second sun gear to the number of teeth of the first sun gear, and i2 is the ratio of the number of teeth of the fourth sun gear to the number of teeth of the third sun gear.

[0014] Optionally, the first planetary gear set includes a first planetary gear and a second planetary gear that are coaxially arranged and connected in transmission, wherein the outer diameter of the first planetary gear is larger than the outer diameter of the second planetary gear, and the first planetary gear and the second planetary gear mesh with the first sun gear and the second sun gear, respectively;

[0015] And / or, the second planetary gear set includes a third planetary gear and a fourth planetary gear that are coaxially arranged and drive-connected, wherein the outer diameter of the third planetary gear is larger than the outer diameter of the fourth planetary gear, and the third planetary gear and the fourth planetary gear mesh with the third sun gear and the fourth sun gear, respectively.

[0016] Optionally, the first sun gear is connected to the drive component in a transmission connection.

[0017] Optionally, the third sun gear is connected to the second drive shaft in a driving connection.

[0018] Optionally, the planetary power system further includes a brake, wherein one of the two second output terminals not connected to the second drive shaft is used to engage or disengage with the brake.

[0019] Optionally, the drive unit includes either a motor or an engine.

[0020] In a second aspect, the present invention provides a vehicle including the planetary power system described above.

[0021] The beneficial effects of the planetary gear power system of the present invention are as follows: by connecting the first input end of the first planetary gear to the drive component, the power output by the drive component can be transmitted to the first planetary gear; by connecting one of the two first output ends of the first planetary gear to the first drive shaft, connecting one of the two second output ends of the second planetary gear to the second drive shaft, and connecting the other of the two second output ends of the second planetary gear to the stationary component of the planetary gear power system, part of the power output by the drive component is transmitted to the first drive shaft via the first planetary gear, and then to, for example, the left drive wheel connected to the first drive shaft; the other part is transmitted to the second drive shaft via the first and second planetary gears, and then to, for example, the right drive wheel connected to the second drive shaft. Thus, the power output by the drive component can be split through the composite planetary gear structure formed by the first and second planetary gears to drive the left and right drive wheels to rotate synchronously. At the same time, the composite planetary gear structure formed by the first and second planetary gears also enables the left and right drive wheels to rotate differentially when the vehicle is turning, thereby realizing the integrated design of main reduction transmission and differential function. Compared to related technologies that employ a main drive reduction system and an independent differential assembly, this eliminates the need to develop a dedicated differential assembly, resulting in a more compact powertrain structure, smaller footprint, and lower production costs. Furthermore, by configuring the first planetary gear set as including a first sun gear, a second sun gear, a first planetary gear set, and a first planetary carrier, and the second planetary gear set as including a third sun gear, a fourth sun gear, a second planetary gear set, and a second planetary carrier, the first and second planetary gear sets constitute two tandem WW planetary gear sets. Both the first and second planetary gear sets are composed of external meshing gears, which not only reduces machining difficulty and improves machining quality but also eliminates the need to develop a high-cost gear ring, thereby reducing production costs. Additionally, it further reduces the number of planetary gear set components and decreases the radial and axial dimensions of the planetary gear set, which is beneficial for overall vehicle layout. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the planetary power system in an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram illustrating another aspect of the planetary power system in an embodiment of the present invention.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Drive unit; 2. First planetary gear set; 21. First sun gear; 22. Second sun gear; 23. First planetary gear set; 231. First planetary gear; 232. Second planetary gear; 24. First planetary carrier; 3. Second planetary gear set; 31. Third sun gear; 32. Fourth sun gear; 33. Second planetary gear set; 331. Third planetary gear; 332. Fourth planetary gear; 34. Second planetary carrier; 4. First drive shaft; 5. Second drive shaft; 6. Brake; 700. Left drive wheel; 800. Right drive wheel. Detailed Implementation

[0026] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0027] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this invention are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0028] It should be noted that the terms "one" and "more" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0029] In related technologies, the reducer is a core component of the automotive powertrain system and a key part of power output, directly affecting the powertrain's power output, overall vehicle performance, and torque-to-quality ratio. Traditional reducers employ a configuration of a main drive reduction system plus an independent differential assembly. The main drive reduction system typically uses a parallel shaft offset arrangement, a parallel shaft coaxial arrangement, or a planetary gear set coaxial arrangement. The differential usually employs a traditional straight bevel gear differential, a spiral bevel gear differential, or a lightweight straight planetary gear set differential. This results in a large number of parts in the automotive powertrain system, as well as significant space occupation and overall weight. In situations where vehicle layout space is limited, this can easily lead to layout difficulties or even make layout impossible.

[0030] To address the problems existing in the aforementioned related technologies, the present invention provides a planetary power system and vehicle.

[0031] Combination Figure 1 As shown, an embodiment of the present invention provides a planetary gear power system, including a drive component 1, a first planetary gear set 2, a second planetary gear set 3, a first drive shaft 4, and a second drive shaft 5;

[0032] The first planetary gear set 2 includes a first sun gear 21, a second sun gear 22, a first planetary gear set 23, and a first planet carrier 24. The first sun gear 21 and the second sun gear 22 are coaxially arranged and mesh with the first planetary gear set 23 respectively. One of the first sun gear 21, the second sun gear 22, and the first planet carrier 24 constitutes the first input end of the first planetary gear set 2, and the other two constitute the first output end of the first planetary gear set 2 respectively.

[0033] The second planetary gear set 3 includes a third sun gear 31, a fourth sun gear 32, a second planetary gear set 33, and a second planetary carrier 34. The third sun gear 31 and the fourth sun gear 32 are coaxially arranged and mesh with the second planetary gear set 33 respectively. One of the third sun gear 31, the fourth sun gear 32, and the second planetary carrier 34 constitutes the second input end of the second planetary gear set 3, and the other two constitute the second output end of the second planetary gear set 3 respectively.

[0034] The first input end is connected to the drive component, the two first output ends are respectively connected to the first drive shaft 4 and the second input end, one of the two second output ends is connected to the second drive shaft 5, and the other is connected to the stationary component of the planetary gear system.

[0035] The power output from the drive unit 1 is transmitted to the first planetary gear set 2 via the first input end of the first planetary gear set 2 and then splits into two paths. One path is transmitted sequentially through the first planetary gear set 23 and the first output end connected to the first drive shaft 4 to the first drive shaft 4. The other path is transmitted sequentially through the first planetary gear set 23, the first output end of the first planetary gear set 2 that is not connected to the first drive shaft 4, and the second input end of the second planetary gear set 3 to the second planetary gear set 3. It is then transmitted sequentially through the second planetary gear set 33 and the second output end of the second planetary gear set 3 that is not connected to the stationary component to the second drive shaft 5.

[0036] Specifically, the driving component 1 can be a motor, in which case the first input end of the first planetary gear set 2 is connected to the motor shaft. Alternatively, the driving component 1 can be an engine, in which case the first input end of the first planetary gear set 2 is connected to the crankshaft of the engine. The first planetary gear set 2 and the second planetary gear set 3 combine to form a compound planetary gear set structure. Both the first planetary gear set 2 and the second planetary gear set 3 include a planet carrier, a planetary gear set, and two sun gears. That is, both the first planetary gear set 2 and the second planetary gear set 3 are WW planetary gear sets, where W represents external meshing, i.e., the meshing between the sun gear and the planet gears. Furthermore, the input end of the second planetary gear set 3 is connected to the output end of the first planetary gear set 2, so that the first planetary gear set 2 and the second planetary gear set 3 are arranged in series, i.e., the first planetary gear set 2 and the second planetary gear set 3 constitute two WW planetary gear sets in series.

[0037] More specifically, there are usually multiple first planetary gear sets 23, which are arranged circumferentially on the first planet carrier 24. Similarly, there are usually multiple second planetary gear sets 33, which are arranged circumferentially on the second planet carrier 34. One of the first sun gear 21, the second sun gear 22, and the first planet carrier 24 constitutes the first input terminal of the first planetary gear set 2, and the other two constitute the first output terminal of the first planetary gear set 2. One of the third sun gear 31, the fourth sun gear 32, and the second planet carrier 34 constitutes the second input terminal of the second planetary gear set 3, and the other two constitute the second output terminal of the second planetary gear set 3. That is, both the first planetary gear set 2 and the second planetary gear set 3 have one input terminal and two output terminals. The stationary component of the planetary gear set power system can be a housing, a motor stator, or a brake, etc. Furthermore, one of the two first output ends of the first planetary gear set 2 is connected to the input end of the second planetary gear set 3, and one of the two second output ends of the second planetary gear set 3 is connected to a stationary component of the planetary gear set power system, for example, by using a spline structure to connect to the housing of the planetary gear set power system, so that the second output end serves as a stationary component in the composite planetary gear set, enabling the first planetary gear set 2 and the second planetary gear set 3 to transmit power to the first drive shaft 4 and the second drive shaft 5 respectively; the other of the two first output ends of the first planetary gear set 2 is connected to one end of the first drive shaft 4, and the other of the two second output ends of the second planetary gear set 3 is connected to one end of the second drive shaft 5. The other ends of the first drive shaft 4 and the second drive shaft 5 are respectively used to connect to, for example, the left drive wheel 700 and the right drive wheel 800 of the vehicle, so as to transmit power to the left drive wheel 700 and the right drive wheel 800 to drive the vehicle.

[0038] For example, in one example, such as Figure 1 As shown, one of the first sun gear 21 and the second sun gear 22 can be used as the first input terminal of the first planetary gear set 2 and connected to the drive member 1 for transmission; the other of the first sun gear 21 and the second sun gear 22 can be used as the first output terminal of the first planetary gear set 2 and connected to the first drive shaft 4 for transmission; the first planet carrier 24 can be used as the first output terminal of the first planetary gear set 2 and connected to the second planet carrier 34, which serves as the second input terminal of the second planetary gear set 3 for transmission; one of the third sun gear 31 and the fourth sun gear 32 can be used as the second output terminal of the second planetary gear set 3 and connected to the second drive shaft 6 for transmission; and the other of the third sun gear 31 and the fourth sun gear 32 can be used as the second output terminal of the second planetary gear set 3 and connected to a stationary component, for example... Figure 1As shown, the first sun gear 21 is used as the first input terminal, the second sun gear 22 is used as the first output terminal connected to the first drive shaft 4, the third sun gear 31 is used as the second output terminal connected to the second drive shaft 6, and the fourth sun gear 32 is used as the second output terminal connected to the stationary component. In this configuration, part of the power output from the drive unit 1 is transmitted sequentially through the first sun gear 21, the first planetary gear set 23, and the second sun gear 22 to the first drive shaft 4, and the other part is transmitted sequentially through the first sun gear 21, the first planetary gear set 23, the first planetary carrier 24, the second planetary carrier 34, the second planetary gear set 33, and the third sun gear 31 to the second drive shaft 5. Alternatively, the first planetary carrier 24 can be used as the first input terminal of the first planetary gear set 2 connected to the drive unit 1, the first sun gear 21 can be used as the first output terminal of the first planetary gear set 2 connected to the first drive shaft 4, and the second sun gear 22 can be used as the first output terminal of the first planetary gear set 2 connected to the second planetary gear set 33 connected to the stationary component 5. The second planetary carrier 34 is connected to the second input terminal of the second planetary gear set 3. One of the third sun gear 31 and the fourth sun gear 32 is connected to the second drive shaft 6 as the second output terminal of the second planetary gear set 3. The other of the third sun gear 31 and the fourth sun gear 32 is connected to the stationary component as the second output terminal of the second planetary gear set 3. Alternatively, the first planetary carrier 24 can be connected to the drive component 1 as the first input terminal of the first planetary gear set 2. The first sun gear 21 can be connected to the first drive shaft 4 as the first output terminal of the first planetary gear set 2. The second sun gear 22 can be connected to the third sun gear 31, which is the second input terminal of the second planetary gear set 3. One of the second planetary carrier 34 and the fourth sun gear 32 can be connected to the second drive shaft 6 as the second output terminal of the second planetary gear set 3. The other of the second planetary carrier 34 and the fourth sun gear 32 can be connected to the stationary component as the second output terminal of the second planetary gear set 3. No specific limitations are imposed here; the design can be selected according to needs in practical applications.

[0039] In this embodiment, the power output by the drive member 1 can be transmitted to the first planetary gear set 2 by connecting the first input terminal of the first planetary gear set 2 to the drive member 1. Furthermore, by connecting one of the two first output terminals of the first planetary gear set 2 to the first drive shaft 4, connecting the other first output terminal of the first planetary gear set 2 to the second input terminal of the second planetary gear set 3, connecting one of the two second output terminals of the second planetary gear set 3 to the second drive shaft 5, and connecting the other second output terminal of the second planetary gear set 3 to a stationary component of the planetary gear set power system, a portion of the power output by the drive member 1 is transmitted through the first planetary gear set 2. The power output from drive component 1 is transmitted to the first drive shaft 4, and then to, for example, the left drive wheel 700 connected to the first drive shaft 4. Another portion is transmitted via the first planetary gear set 2 and the second planetary gear set 3 to the second drive shaft 5, and then to, for example, the right drive wheel 800 connected to the second drive shaft 5. This allows the power output from drive component 1 to be split via the composite planetary gear set structure formed by the first planetary gear set 2 and the second planetary gear set 3, to drive the left drive wheel 700 and the right drive wheel 800 to rotate synchronously. Simultaneously, the composite planetary gear set structure also enables the left drive wheel 700 and the right drive wheel 800 to rotate differentially when the vehicle is turning, thus achieving an integrated design of main reduction drive and differential function. Compared with related technologies that use a main drive reduction system and an independent differential assembly, this eliminates the need to develop a dedicated differential assembly, making the entire powertrain structure more compact, occupying less space, and reducing production costs. Furthermore, by configuring the first planetary gear set 2 to include a first sun gear 21, a second sun gear 22, a first planetary gear set 23, and a first planetary carrier 24, and configuring the second planetary gear set 3 to include a third sun gear 31, a fourth sun gear 32, a second planetary gear set 33, and a second planetary carrier 34, the first planetary gear set 2 and the second planetary gear set 3 constitute two tandem WW planetary gear sets. That is, both the first planetary gear set 2 and the second planetary gear set 3 are composed of external meshing gears. This not only reduces the processing difficulty and improves the processing quality, but also eliminates the need to develop and manufacture high-cost gear rings, thereby reducing production costs. At the same time, it can also reduce the number of planetary gear set components and reduce the radial and axial dimensions of the planetary gear set, which is beneficial for the overall vehicle layout.

[0040] In other embodiments, the second planetary gear set 3 can be controlled by adding an active control element, such as adding a drive element 1, so that the first planetary gear set 2 and the second planetary gear set 3 can be controlled by the two drive elements 1 respectively, thereby achieving the need for active differential or intelligent drive control.

[0041] Optionally, the drive unit 1 includes either a motor or an engine. When the drive unit 1 is a motor, the first input terminal of the first planetary gear set 2 is connected to the motor shaft to transmit the power of the motor to the first planetary gear set 2. In this case, the planetary gear set power system is suitable for electric vehicles. When the drive unit 1 is an engine, the first input terminal of the first planetary gear set 2 is connected to the crankshaft of the engine to transmit the power output from the engine to the first planetary gear set 2. In this case, the planetary gear set power system is suitable for gasoline-powered vehicles. This expands the applicability of the planetary gear set power system.

[0042] Optionally, combined Figure 1 As shown, one of the first sun gear 21 and the second sun gear 22 constitutes the first input terminal, and the second planetary carrier 34 constitutes the second input terminal and is drive-connected to the first planetary carrier 24. This arrangement allows the first planetary gear set 2 and the second planetary gear set 3 to be connected in series via the first planetary carrier 24 and the second planetary carrier 34. That is, the two WW planetary gear sets are connected in series via their respective planetary carriers. Compared to connecting the two WW planetary gear sets in series via one planetary carrier and the other's sun gear, or via their respective sun gears, this reduces manufacturing difficulty and decreases the radial and axial dimensions of the composite planetary gear set structure, thereby making the planetary gear set power system more compact and facilitating vehicle layout. Furthermore, fixing one of the two sun gears of the second planetary gear set 3 as a stationary component provides positioning and support for the planetary gear set power system, thereby improving the structural strength of the planetary gear set power system.

[0043] Optionally, the first planetary carrier 24 and the second planetary carrier 34 are integrally connected. This allows the first planetary gear set 2 and the second planetary gear set 3 to be connected in series by sharing a planetary carrier, which not only reduces the number of parts but also reduces power loss between the first planetary gear set 2 and the second planetary gear set 3, ensuring the reliability of power transmission between the first planetary gear set 2 and the second planetary gear set 3.

[0044] Optionally, the transmission ratio of the planetary gear system is i. ,and ;

[0045] Where i1 is the ratio of the number of teeth of the second sun gear 22 to the number of teeth of the first sun gear 21, and i2 is the ratio of the number of teeth of the fourth sun gear 32 to the number of teeth of the third sun gear 31.

[0046] In this optional embodiment, the first sun gear 21, the second sun gear 22, and the third sun gear 31 are respectively connected to the drive member 1, the first drive shaft 4, and the second drive shaft 5, and are connected to the first planet carrier 24 and the second planet carrier 34. That is, the input end of the first planetary gear set 2 is the first sun gear 21, and the output end connected to the first drive shaft 4 is the second sun gear 22. The input end of the second planetary gear set 3 is the second planet carrier 34, and the output end connected to the second drive shaft 5 is the third sun gear 31. Since the first planetary gear set 2 and the second planetary gear set 3 are equivalent to a WW planetary gear set, the gear ratio i1 between the second sun gear 22 and the first sun gear 21, and the gear ratio i2 between the fourth sun gear 32 and the third sun gear 31 are also the transmission ratios of two WW planetary gear sets connected in series. Thus, according to the formula... To calculate the transmission ratio of the planetary gear set power system, and by setting the gear ratio of the first planetary gear set 2 and the second planetary gear set 3 to... This ensures that when the vehicle is turning, the upward speed of the second sun gear 22 is equal to the downward speed of the third sun gear 31, or the downward speed of the second sun gear 22 is equal to the upward speed of the third sun gear 31, so that the planetary gear power system meets the differential speed condition for vehicle turning.

[0047] Optionally, combined Figure 1 As shown, the first planetary gear set 23 includes a first planetary gear 231 and a second planetary gear 232 coaxially arranged and connected in transmission. The outer diameter of the first planetary gear 231 is larger than the outer diameter of the second planetary gear 232. The first planetary gear 231 and the second planetary gear 232 mesh with the first sun gear 21 and the second sun gear 22, respectively. In this way, the first planetary gear 231 and the first sun gear 21, as well as the second planetary gear 232 and the second sun gear 22, form a two-stage gear pair to realize the two-stage reduction transmission of the first planetary gear set 2. Moreover, the first planetary gear set 23 is a double planetary gear structure, which can expand the speed ratio range of the planetary gear set power system, thereby allowing the planetary gear set power system to be equipped with a high-speed, low-torque lightweight motor, so as to further reduce the overall weight of the planetary gear set power system.

[0048] Optionally, combined Figure 1 As shown, the first sun gear 21 is connected to the drive unit 1 in a transmission manner. Compared with meshing the first sun gear 21 with the second planetary gear 232, which has a smaller outer diameter, this reduces the radial dimension of the first sun gear 21. In addition, when the drive unit 1 is a motor, the first sun gear 21 is usually designed as an integral part of the motor shaft. Therefore, reducing the radial dimension of the first sun gear 21 also reduces the radial dimension of the motor shaft, thereby reducing the space and weight occupied by the motor and facilitating the overall vehicle layout.

[0049] Optionally, combined Figure 1As shown, the second planetary gear set 33 includes a third planetary gear 331 and a fourth planetary gear 332 coaxially arranged and connected in transmission. The outer diameter of the third planetary gear 331 is larger than the outer diameter of the fourth planetary gear 332. The third planetary gear 331 and the fourth planetary gear 332 mesh with the third sun gear 31 and the fourth sun gear 32, respectively. In this way, the third planetary gear 331 and the third sun gear 31, as well as the fourth planetary gear 332 and the fourth sun gear 32, form a two-stage gear pair to achieve two-stage reduction transmission in the second planetary gear set 3. Moreover, the second planetary gear set 33 is a double planetary gear structure, which further expands the speed ratio range of the planetary gear set power system based on the fact that the first planetary gear set 23 is also a double planetary gear structure. This allows the planetary gear set power system to be equipped with a high-speed, low-torque lightweight motor, thereby further reducing the overall weight of the planetary gear set power system.

[0050] Optionally, combined Figure 1 As shown, the third sun gear 31 is connected to the second drive shaft 5. Compared with meshing the third sun gear 31 with the fourth planetary gear 332 with a smaller outer diameter, this reduces the radial dimension of the third sun gear 31, making the structure of the second planetary gear set 3 more compact and facilitating the overall vehicle layout.

[0051] Optionally, combined Figure 2 As shown, the planetary gear system also includes a brake 6, and the second output end of the two second output ends that is not connected to the second drive shaft 5 is used to engage or disengage from the brake 6.

[0052] In this optional embodiment, the second planet carrier 34 of the second planetary gear set 3 constitutes a second input terminal, and the third sun gear 31 and the fourth sun gear 32 of the second planetary gear set 3 constitute two second output terminals. One of the third sun gear 31 and the fourth sun gear 32 is connected to the second drive shaft 5 for transmission, and the other is used to engage or disengage with the brake 6, for example... Figure 2 As shown, the third sun gear 31 is connected to the second drive shaft 5, and the fourth sun gear 32 is used to engage or disengage with the brake 6. When the fourth sun gear 32 is engaged with the brake 6, it remains stationary, allowing the first planetary gear set 2 and the second planetary gear set 3 to transmit power to the first drive shaft 4 and the second drive shaft 5 respectively to drive the vehicle. When the fourth sun gear 32 is disengaged from the brake 6, a neutral gear function is achieved. Thus, by using the brake 6 to fix a certain output end of the second planetary gear set 3, the deceleration and differential functions of the planetary gear set power system are realized. This allows the planetary gear set power system to achieve a neutral gear function by releasing the brake 6, thereby expanding the functionality of the planetary gear set power system.

[0053] An embodiment of the present invention provides a vehicle including the planetary power system described above.

[0054] The beneficial effects of the vehicle in this embodiment are the same as those of the planetary power system described above, and will not be repeated here.

[0055] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A planetary array power system, characterized by, It includes a drive unit (1), a first planetary gear set (2), a second planetary gear set (3), a first drive shaft (4), and a second drive shaft (5); The first planetary gear set (2) includes a first sun gear (21), a second sun gear (22), a first planetary gear set (23), and a first planet carrier (24). The first sun gear (21) and the second sun gear (22) are coaxially arranged and mesh with the first planetary gear set (23) respectively. One of the first sun gear (21), the second sun gear (22), and the first planet carrier (24) constitutes the first input end of the first planetary gear set (2), and the other two constitute the first output end of the first planetary gear set (2). The second planetary gear set (3) includes a third sun gear (31), a fourth sun gear (32), a second planetary gear set (33), and a second planetary carrier (34). The third sun gear (31) and the fourth sun gear (32) are coaxially arranged and mesh with the second planetary gear set (33) respectively. One of the third sun gear (31), the fourth sun gear (32), and the second planetary carrier (34) constitutes the second input end of the second planetary gear set (3), and the other two constitute the second output end of the second planetary gear set (3). The first input terminal is connected to the drive component, the two first output terminals are respectively connected to the first drive shaft (4) and the second input terminal, one of the two second output terminals is connected to the second drive shaft (5), and the other is connected to the stationary component of the planetary gear system; The power output by the drive unit (1) is transmitted to the first planetary gear set (2) via the first input end of the first planetary gear set (2) and then splits into two paths. One path is transmitted sequentially through the first planetary gear set (23) and the first output end connected to the first drive shaft (4) to the first drive shaft (4). The other path is transmitted sequentially through the first planetary gear set (23), the first output end of the first planetary gear set (2) that is not connected to the first drive shaft (4), and the second input end of the second planetary gear set (3) to the second planetary gear set (3), and then sequentially through the second planetary gear set (33) and the second output end of the second planetary gear set (3) that is not connected to the stationary component to the second drive shaft (5).

2. The planetary power system according to claim 1, characterized in that, One of the first sun gear (21) and the second sun gear (22) constitutes the first input terminal, and the second planetary carrier (34) constitutes the second input terminal and is connected to the first planetary carrier (24) in a transmission.

3. The planetary power system according to claim 2, characterized in that, The first planetary carrier (24) and the second planetary carrier (34) are integrally connected.

4. The planetary power system according to claim 2, characterized in that, The transmission ratio of the planetary power system is i. ,and ; Where i1 is the ratio of the number of teeth of the second sun gear (22) to the number of teeth of the first sun gear (21), and i2 is the ratio of the number of teeth of the fourth sun gear (32) to the number of teeth of the third sun gear (31).

5. The planetary power system according to claim 1, characterized in that, The first planetary gear set (23) includes a first planetary gear (231) and a second planetary gear (232) that are coaxially arranged and connected in transmission. The outer diameter of the first planetary gear (231) is larger than the outer diameter of the second planetary gear (232). The first planetary gear (231) and the second planetary gear (232) mesh with the first sun gear (21) and the second sun gear (22) respectively. And / or, the second planetary gear set (33) includes a third planetary gear (331) and a fourth planetary gear (332) that are coaxially arranged and connected in transmission, wherein the outer diameter of the third planetary gear (331) is larger than the outer diameter of the fourth planetary gear (332), and the third planetary gear (331) and the fourth planetary gear (332) mesh with the third sun gear (31) and the fourth sun gear (32) respectively.

6. The planetary power system according to claim 5, characterized in that, The first sun gear (21) is connected to the drive unit (1) in a transmission connection.

7. The planetary power system according to claim 5, characterized in that, The third sun gear (31) is connected to the second drive shaft (5) for transmission.

8. The planetary power system according to claim 1, characterized in that, It also includes a brake (6), and one of the two second output terminals that is not connected to the second drive shaft (5) is used to engage or disengage from the brake (6).

9. The planetary power system according to claim 1, characterized in that, The drive unit (1) includes either a motor or an engine.

10. A vehicle, characterized in that, Includes the planetary power system as described in any one of claims 1-9.

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