Speed reducer, electric driving system and vehicle

Abstract

The embodiment of the invention provides a speed reducer, an electric driving system and a vehicle. The first planet row structure comprises a first clutch and a first planet row assembly, and the first clutch is connected with the first planet row assembly and the input shaft; the second planet row structure comprises a second clutch, a third clutch and a second planet row assembly, the second clutch is connected with the input shaft and the second planet row assembly, and the third clutch is connected between the second planet row assembly and the second clutch; and the brake is connected with the second planet row assembly. The first planet row assembly is connected with the first clutch, the second planet row assembly is connected with the second clutch, the third clutch and the brake, after the input shaft outputs power, multiple gears can be achieved through cooperation of the first clutch, the second clutch, the third clutch and the brake, the gear shifting logic is simple and reliable, power interruption is avoided, and the gear shifting efficiency is improved. And the economical efficiency and the comfort of the whole vehicle can be obviously improved.

Description

Technical Field

[0001] The present application relates to the technical field of reducers, and in particular to a reducer, an electric drive system and a vehicle. Background Art

[0002] The electric vehicle reducer is an important component in the vehicle transmission system. Its main function is to convert the high rotational torque of the motor into low-speed and high torque of the wheels, thereby realizing the form of the vehicle.

[0003] In the related technology, the reducer is undergoing a product evolution process from a single gear to a multi-gear. When switching between multiple gears, the correct control logic of the gear positions should be ensured. Therefore, there is an urgent need for a reducer to achieve multi-gear switching. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a reducer, an electric drive system and a vehicle, which can form multiple gears, have simple and reliable gear shifting logic, and no power interruption, which can significantly improve the economy and comfort of the entire vehicle.

[0005] In the first aspect, an embodiment of the present application provides a reducer, comprising: an input shaft; a first planetary gear structure, comprising a first clutch and a first planetary gear assembly, the first clutch being respectively connected to the first planetary gear assembly and the input shaft; a second planetary gear structure, comprising a second clutch, a third clutch and a second planetary gear assembly, the second clutch being respectively connected to the input shaft and the second planetary gear assembly, the third clutch being connected between the second planetary gear assembly and the second clutch; and a brake, which is connected to the second planetary gear assembly.

[0006] In the above implementation process, the first planetary gear assembly is connected to the first clutch, and the second planetary gear assembly is connected to the second clutch, the third clutch and the brake. When the input shaft outputs power, multiple gears can be achieved through the cooperation of the first clutch, the second clutch, the third clutch and the brake. The gear shifting logic is simple and reliable, and there is no power interruption, which can significantly improve the economy and comfort of the whole vehicle.

[0007] In some embodiments, the reducer is configured with first gear, second gear, third gear and fourth gear, wherein when the reducer is in the first gear, the first clutch is connected, the second clutch is disconnected, the third clutch is disconnected, and the brake is connected; when the reducer is in the second gear, the first clutch is connected, the second clutch is disconnected, the third clutch is connected, and the brake is disconnected; when the reducer is in the third gear, the first clutch is disconnected, the second clutch is connected, the third clutch is disconnected, and the brake is connected; when the reducer is in the fourth gear, the first clutch is disconnected, the second clutch is connected, the third clutch is connected, and the brake is disconnected.

[0008] In the above implementation process, the connection or disconnection of the first clutch, the second clutch, the third clutch and the brake can achieve four gears. The gear shifting logic is simple and reliable, without power interruption, which can significantly improve the economy and comfort of the vehicle.

[0009] In some embodiments, the first planetary gear assembly includes a first sun gear, a first planetary gear, a first ring gear and a first planet carrier, the first sun gear is connected to the first clutch, the first planetary gear is meshed with the first sun gear, the first planetary gear is configured on the first planet carrier, and the first ring gear is meshed with the first planetary gear.

[0010] In the above implementation process, the first sun gear is connected to the first clutch as the input side. When the input shaft transmits power, if the first clutch is connected, the first sun gear drives the first planetary gear to rotate, and the first planetary gear is meshed with the first ring gear. When the first ring gear is fixed, the first planetary gear revolves and rotates around the first ring gear. At the same time, the first planetary carrier can be used to output power to the second clutch or the third clutch, thereby realizing power transmission and torque amplification, so that the first planetary gear assembly has higher transmission efficiency and torque transmission capacity, and its shifting logic is simple and reliable, without power interruption, which can significantly improve the economy and comfort of the whole vehicle.

[0011] In some embodiments, the second planetary gear assembly includes a second sun gear, a second planetary gear, a second ring gear and a second planet carrier, the second sun gear is connected to the second clutch, the second planetary gear is meshed with the second sun gear, the second planetary gear is configured on the second planet carrier, and the second ring gear is meshed with the second planetary gear.

[0012] In the above implementation process, the second planetary gear assembly and the first planetary gear assembly are arranged side by side, which can make the reducer more compact, which is conducive to high integration and vehicle layout. At the same time, the second sun gear is connected to the second clutch as the input side. When the input shaft transmits power, the second sun gear can drive the second planetary gear to rotate through the connection of the first clutch or the second clutch. The second planetary gear is meshed with the second ring gear. When the second ring gear is fixed, the second planetary gear revolves and rotates around the second ring gear. At the same time, the second planetary carrier can be used to output power, thereby realizing power transmission and torque amplification, so that the second planetary gear assembly has higher transmission efficiency and torque transmission capacity, and its shifting logic is simple and reliable, without power interruption, which can significantly improve the economy and comfort of the whole vehicle.

[0013] In some embodiments, one end of the first planet carrier is connected between the third clutch and the second sun gear. Multiple gears can be realized, and the gear shifting logic is simple and reliable without power interruption, which can significantly improve the economy and comfort of the whole vehicle.

[0014] In some embodiments, the reducer further includes a differential, and the differential is connected to the second planetary gear structure, so as to realize high-speed ratio transmission and be highly integrated with the motor, thereby increasing the space inside the vehicle and facilitating the layout of the entire vehicle.

[0015] In some embodiments, the reducer further includes a first half-shaft and a second half-shaft, wherein the first half-shaft is connected to one side of the differential, the second half-shaft is connected to the other side of the differential, and the first half-shaft and the second half-shaft are coaxially arranged.

[0016] In the above implementation process, the first half shaft and the second half shaft are respectively connected to the differential, and the first half shaft and the second half shaft are coaxially distributed, which not only occupies a small space and improves the space inside the vehicle, but also can realize a large speed ratio transmission, with higher transmission efficiency and torque transmission capability.

[0017] In some embodiments, the reducer further includes a housing, and the first planetary gear structure and the brake are respectively connected to the housing.

[0018] In a second aspect, the present application further provides an electric drive system, comprising: a motor, which is equipped with a rotor shaft; and a reducer as described in any one of the above, wherein the input shaft of the reducer is connected to the rotor shaft. The power output by the rotor shaft of the motor can be transmitted by the input shaft of the reducer, which can achieve a more compact structure and be highly integrated with the motor, which is beneficial to the layout of the whole vehicle.

[0019] In some embodiments, the input shaft and the rotor shaft are configured as one body, which can solve the problem of centering and improve NVH performance.

[0020] In a third aspect, the present application further provides a vehicle, comprising: wheels; and an electric drive system as described in any one of the above items, wherein a first half-shaft and a second half-shaft of the electric drive system are respectively connected to the wheels.

[0021] Since the vehicle provided in the third aspect includes an electric drive system, the vehicle has all the technical effects of the electric drive system and will not be elaborated here.

[0022] Other features and advantages of the present disclosure will be set forth in the following description, or some features and advantages may be inferred or unambiguously determined from the description, or may be learned by implementing the above-mentioned technology of the present disclosure.

[0023] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of the structure of the reducer provided in an embodiment of the present application.

[0026] Reference numerals

[0027] 100, input shaft; 200, first planetary gear structure; 201, first clutch; 202, first sun gear; 203, first planetary gear; 204, first ring gear; 205, first planetary carrier; 300, second planetary gear structure; 301, second clutch; 302, third clutch; 303, second sun gear; 304, second planetary gear; 305, second ring gear; 306, second planetary carrier; 400, brake; 500, differential; 600, first half shaft; 700, second half shaft; 800, motor. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0029] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0030] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0031] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or a point connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0033] Example

[0034] The types of reducers for electric vehicles mainly include cylindrical gear reducers, worm reducers and planetary gear reducers. These reducers are further subdivided into single-speed and multi-speed reducers as well as expansion, split and coaxial reducers according to the different transmission levels and layout forms. According to the trend of high-speed motors, reducers are undergoing a product evolution process from single-speed to multi-speed, including single-speed reducers, two-speed reducers and multi-speed reducers.

[0035] During the design process, the inventor discovered that the reducers currently on the market are mostly cylindrical gear, parallel shaft, and single-speed types, which have the disadvantages of occupying a large space, low efficiency, and difficulty in layout as the torque increases.

[0036] In view of this, if Figure 1 As shown, in the first aspect, an embodiment of the present application provides a reducer, including: an input shaft 100; a first planetary gear structure 200, including a first clutch 201 and a first planetary gear assembly, the first clutch 201 is respectively connected to the first planetary gear assembly and the input shaft 100; a second planetary gear structure 300, including a second clutch 301, a third clutch 302 and a second planetary gear assembly, the second clutch 301 is respectively connected to the input shaft 100 and the second planetary gear assembly, the third clutch 302 is connected between the second planetary gear assembly and the second clutch 301; a brake 400, which is connected to the second planetary gear assembly.

[0037] Exemplarily, the first planetary gear assembly and the second planetary gear assembly are arranged side by side, and the first clutch 201 and the second clutch 301 are respectively connected to the input shaft 100, so that when the input shaft 100 outputs power, the power can be transmitted to the first planetary gear assembly or the second planetary gear assembly according to the connection of the first clutch 201 or the connection of the second clutch 301.

[0038] In the above implementation process, the first planetary gear assembly is connected to the first clutch 201, and the second planetary gear assembly is connected to the second clutch 301, the third clutch 302 and the brake 400. When the input shaft 100 outputs power, multiple gears can be achieved through the cooperation of the first clutch 201, the second clutch 301, the third clutch 302 and the brake 400. The gear shifting logic is simple and reliable, and there is no power interruption, which can significantly improve the economy and comfort of the entire vehicle.

[0039] In some embodiments, the reducer is configured with first gear, second gear, third gear and fourth gear, wherein when the reducer is in the first gear, the first clutch 201 is connected, the second clutch 301 is disconnected, the third clutch 302 is disconnected, and the brake 400 is connected; when the reducer is in the second gear, the first clutch 201 is connected, the second clutch 301 is disconnected, the third clutch 302 is connected, and the brake 400 is disconnected; when the reducer is in the third gear, the first clutch 201 is disconnected, the second clutch 301 is connected, the third clutch 302 is disconnected, and the brake 400 is connected; when the reducer is in the fourth gear, the first clutch 201 is disconnected, the second clutch 301 is connected, the third clutch 302 is connected, and the brake 400 is disconnected.

[0040] In the above implementation process, the connection or disconnection of the first clutch 201, the second clutch 301, the third clutch 302 and the brake 400 can achieve four gears. The gear shifting logic is simple and reliable, without power interruption, which can significantly improve the economy and comfort of the vehicle.

[0041] like Figure 1 As shown, the first planetary gear assembly includes a first sun gear 202, a first planetary gear 203, a first ring gear 204 and a first planet carrier 205, the first sun gear 202 is connected to the first clutch 201, the first planetary gear 203 is meshed with the first sun gear 202, the first planetary gear 203 is arranged on the first planet carrier 205, and the first ring gear 204 is meshed with the first planetary gear 203.

[0042] Exemplarily, the number of the first planetary gears 203 can be set to multiple, and the multiple first planetary gears 203 are distributed at intervals along the circumference of the inner ring of the first ring gear 204. By setting more than one first planetary gear 203 to mesh along the inner ring of the first ring gear 204 at the same time, the transmission process is smoother and the impact and vibration are reduced; correspondingly, multiple first planetary gears 203 are commonly connected to a first planetary carrier 205, which can achieve greater torque transmission and higher transmission efficiency, and is conducive to dispersing the torque load and reducing the overload risk of a single first planetary gear 203.

[0043] In the above implementation process, the first sun gear 202 is connected to the first clutch 201 as the input side. When the input shaft 100 transmits power, if the first clutch 201 is connected, the first sun gear 202 drives the first planetary gear 203 to rotate, and the first planetary gear 203 is meshed with the first ring gear 204. When the first ring gear 204 is fixed, the first planetary gear revolves around the first ring gear 204 and rotates on its own axis. At the same time, the first planetary carrier 205 can be used to output power to the second clutch 301 or the third clutch 302, thereby realizing power transmission and torque amplification, so that the first planetary gear assembly has higher transmission efficiency and torque transmission capacity, and its shifting logic is simple and reliable, without power interruption, which can significantly improve the economy and comfort of the whole vehicle.

[0044] In some embodiments, the second planetary gear assembly includes a second sun gear 303, a second planetary gear 304, a second ring gear 305 and a second planet carrier 306, the second sun gear 303 is connected to the second clutch 301, the second planetary gear 304 is meshed with the second sun gear 303, the second planetary gear 304 is configured on the second planet carrier 306, and the second ring gear 305 is meshed with the second planetary gear 304.

[0045] Exemplarily, the number of the second planetary gears 304 can be set to multiple, and the multiple second planetary gears 304 are distributed at intervals along the circumference of the inner ring of the second ring gear 305. By setting more than one second planetary gear 304 to mesh along the inner ring of the second ring gear 305 at the same time, the transmission process is smoother and the impact and vibration are reduced; correspondingly, multiple second planetary gears 304 are commonly connected to a second planetary carrier 306, which can achieve greater torque transmission and higher transmission efficiency, and is conducive to dispersing the torque load and reducing the overload risk of a single second planetary gear 304.

[0046] It can be understood that when the reducer is in the first gear, the input shaft 100 outputs power, and the power is transmitted to the differential 500 after passing through the first clutch 201, the first sun gear 202, the first planetary gear 203, the first planetary carrier 205, the second sun gear 303, the second planetary gear 304, and the second planetary carrier 306, and finally output to the left and right wheels;

[0047] When the reducer is in the second gear, the input shaft 100 outputs power, and the power is transmitted to the differential 500 after passing through the first clutch 201, the first sun gear 202, the first planetary gear 203, the first planetary carrier 205, the second planetary gear 304 and the second planetary carrier 306, and finally output to the left and right wheels;

[0048] When the reducer is in the third gear, the input shaft 100 outputs power, which is transmitted to the differential 500 after passing through the second clutch 301, the second planetary gear 304 and the second planetary carrier 306, and finally output to the left and right wheels;

[0049] When the reducer is in the fourth gear, which is a direct gear, that is, the speed ratio is 1, the input shaft 100 outputs power, and the power is transmitted to the differential 500 after passing through the second clutch 301, the second planetary gear 304 and the second planetary carrier 306, and is finally output to the left and right wheels.

[0050] In the above implementation process, the second planetary gear assembly is arranged side by side with the first planetary gear assembly, which can make the reducer more compact, which is conducive to high integration and vehicle layout. At the same time, the second sun gear 303 is connected to the second clutch 301 as the input side. When the input shaft 100 transmits power, it can be connected through the first clutch 201 or the second clutch 301. The second sun gear 303 drives the second planetary gear 304 to rotate, and the second planetary gear 304 is meshed with the second ring gear 305. When the second ring gear 305 is fixed, the second planetary gear revolves and rotates around the second ring gear 305. At the same time, the second planet carrier 306 can be used to output power, thereby realizing power transmission and torque amplification, so that the second planetary gear assembly has higher transmission efficiency and torque transmission capacity, and its shifting logic is simple and reliable, without power interruption, which can significantly improve the economy and comfort of the whole vehicle.

[0051] In some embodiments, one end of the first planet carrier 205 is connected between the third clutch 302 and the second sun gear 303. Multiple gears can be realized, and the shifting logic is simple and reliable without power interruption, which can significantly improve the economy and comfort of the whole vehicle.

[0052] In some embodiments, the speed reducer further includes a differential 500, and the differential 500 is connected to the second planetary gear structure 300. A high speed ratio transmission can be achieved, and the motor 800 can be highly integrated to increase the space inside the vehicle, which is beneficial to the layout of the entire vehicle.

[0053] Illustratively, by configuring the differential 500, the wheels on both sides of the vehicle can realize a differential function, thereby adapting to different driving requirements, increasing the vehicle's maneuverability and adaptability, and enabling it to better cope with complex driving environments and mission requirements.

[0054] In some embodiments, the reducer also includes a first half shaft 600 and a second half shaft 700, wherein the first half shaft 600 is connected to one side of the differential 500, and the second half shaft 700 is connected to the other side of the differential 500, and the first half shaft 600 and the second half shaft 700 are coaxially arranged.

[0055] In the above implementation process, the first half-shaft 600 and the second half-shaft 700 are respectively connected to the differential 500, and the first half-shaft 600 and the second half-shaft 700 are coaxially distributed, which not only occupies a small space and improves the space inside the vehicle, but also can realize a large speed ratio transmission, and has higher transmission efficiency and torque transmission capability.

[0056] In some embodiments, the reducer further includes a housing, and the first planetary gear structure 200 and the brake 400 are respectively connected to the housing.

[0057] In the second aspect, the present application also provides an electric drive system, including: a motor 800, which is equipped with a rotor shaft; and a reducer as described above, wherein the input shaft 100 of the reducer is connected to the rotor shaft, and the first half shaft 600 of the reducer can pass through the motor 800 and be connected to the wheels of the vehicle. The power output by the rotor shaft of the motor 800 can be transmitted by the input shaft 100 of the reducer, which can achieve a more compact structure and be highly integrated with the motor 800, which is beneficial to the layout of the whole vehicle.

[0058] It can be understood that the electric drive system may further include a controller (not shown in the figure). The layout position of the controller is not specifically limited and can be arranged according to actual conditions, wherein the controller is connected to the motor 800, wherein the controller can receive various signals and information from the vehicle, including vehicle speed, acceleration, steering angle, etc., and then adjust the operating state of the motor 800 in real time according to this information. Under the control of the controller, the motor 800 can accurately adjust the speed and torque according to the actual needs of the vehicle, thereby achieving more efficient and smooth driving.

[0059] In some embodiments, the input shaft 100 and the rotor shaft are configured as one body, which can solve the problem of centering and improve NVH performance.

[0060] In a third aspect, the present application further provides a vehicle, comprising: wheels; and the electric drive system as described above, wherein a first half-shaft 600 and a second half-shaft 700 of the electric drive system are respectively connected to the wheels.

[0061] The vehicles can be fuel vehicles, gas vehicles or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc.

[0062] Since the vehicle provided in the third aspect includes an electric drive system, the vehicle has all the technical effects of the electric drive system and will not be elaborated here.

[0063] In all the embodiments of the present application, "big" and "small" are relative, "more" and "less" are relative, and "up" and "down" are relative. The expressions of such relative terms are not elaborated in the embodiments of the present application.

[0064] It should be understood that the "in this embodiment", "in the embodiment of the present application" or "as an optional implementation" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in this embodiment", "in the embodiment of the present application" or "as an optional implementation" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. Those skilled in the art should also be aware that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required for the present application.

[0065] In the various embodiments of the present application, it should be understood that the size of the serial numbers of the above-mentioned processes does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0066] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A reducer, characterized in that: include: Input shaft; A first planetary gear structure includes a first clutch and a first planetary gear assembly, wherein the first clutch is connected to the first planetary gear assembly and the input shaft respectively; A second planetary gear structure comprises a second clutch, a third clutch and a second planetary gear assembly, wherein the second clutch is connected to the input shaft and the second planetary gear assembly respectively, and the third clutch is connected between the second planetary gear assembly and the second clutch; A brake is connected to the second planetary gear assembly.

2. The reducer according to claim 1, characterized in that: The reducer is configured with first gear, second gear, third gear and fourth gear. When the reducer is in the first gear, the first clutch is connected, the second clutch is disconnected, the third clutch is disconnected, and the brake is connected. When the reducer is in the second gear, the first clutch is connected, the second clutch is disconnected, the third clutch is connected, and the brake is disconnected. When the reducer is in the third gear, the first clutch is disconnected, the second clutch is connected, the third clutch is disconnected, and the brake is connected. When the reducer is in the fourth gear, the first clutch is disconnected, the second clutch is connected, the third clutch is connected, and the brake is disconnected.

3. The reducer according to claim 2, characterized in that: The first planetary gear assembly includes a first sun gear, a first planetary gear, a first ring gear and a first planet carrier. The first sun gear is connected to the first clutch. The first planetary gear is meshed with the first sun gear. The first planetary gear is disposed on the first planet carrier. The first ring gear is meshed with the first planetary gear.

4. The reducer according to claim 3, characterized in that: The second planetary gear assembly includes a second sun gear, a second planetary gear, a second ring gear and a second planet carrier, the second sun gear is connected to the second clutch, the second planetary gear is meshed with the second sun gear, the second planetary gear is configured on the second planet carrier, and the second ring gear is meshed with the second planetary gear.

5. The reducer according to claim 4, characterized in that: One end of the first planet carrier is connected between the third clutch and the second sun gear.

6. The reducer according to claim 1 or 5, characterized in that: The speed reducer further includes a differential, and the differential is connected to the second planetary gear structure.

7. The reducer according to claim 6, characterized in that: The reducer further includes a first half shaft and a second half shaft, wherein the first half shaft is connected to one side of the differential, the second half shaft is connected to the other side of the differential, and the first half shaft and the second half shaft are coaxially arranged.

8. The reducer according to claim 1 or 5, characterized in that: The reducer further includes a housing, and the first planetary gear structure and the brake are respectively connected to the housing.

9. An electric drive system, characterized in that: include: an electric motor having a rotor shaft; and The reducer according to any one of claims 1 to 8, wherein the input shaft of the reducer is connected to the rotor shaft.

10. The electric drive system according to claim 9, characterized in that: The input shaft is configured as a whole with the rotor shaft.

11. A vehicle, characterized in that: include: wheel; and According to any one of claims 9 to 10, the first half-shaft and the second half-shaft of the electric drive system are respectively connected to the wheels.

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