A variable speed device and vehicle

Abstract

The application discloses a variable speed device and a vehicle, the variable speed device comprises an input gear, a first planetary gear mechanism, a second planetary gear mechanism, a first sliding sleeve, a second sliding sleeve and an output shaft; the input gear, the first planetary gear mechanism and the second planetary gear mechanism are rotatably arranged on the output shaft, the input gear, the first planetary gear mechanism and the second planetary gear mechanism are distributed along the axial direction of the output shaft, the input gear is disconnectably connected with the first planetary gear mechanism through the first sliding sleeve, the first planetary gear mechanism is disconnectably connected with the second planetary gear mechanism through the second sliding sleeve, the variable speed device has a first power output state and a second power output state, the variable speed device relates to the technical field of vehicle variable speed, and the variable speed device solves the problems of low transmission efficiency and poor reliability. The vehicle comprises the variable speed device.

Description

Technical Field

[0001] This invention relates to the field of vehicle transmission technology, and more particularly to a transmission device and a vehicle. Background Technology

[0002] With the development of new energy vehicle technology, the requirements for the reliability and efficiency of drive systems are gradually increasing. The transmission system is an important component of the drive assembly of new energy vehicles; currently, the transmission mechanism of the transmission system in pure electric heavy trucks is complex, requiring multiple intermediate drive shafts and multiple gears for power transmission, which not only results in low transmission efficiency but also low reliability of the transmission system. Summary of the Invention

[0003] The purpose of this invention is to provide a transmission device and a vehicle for vehicle speed change.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A speed change device, the speed change device comprising an input gear, a first planetary gear mechanism, a second planetary gear mechanism, a first sliding sleeve, a second sliding sleeve, and an output shaft;

[0006] The input gear, the first planetary gear mechanism, and the second planetary gear mechanism are rotatably mounted on the output shaft. The input gear, the first planetary gear mechanism, and the second planetary gear mechanism are distributed along the axial direction of the output shaft. The input gear is detachably connected to the first planetary gear mechanism through the first sliding sleeve, and the first planetary gear mechanism is detachably connected to the second planetary gear mechanism through the second sliding sleeve. The transmission device has a first power output state and a second power output state.

[0007] When the transmission device is in the first power output state, the input gear is connected to the output shaft through the first sliding sleeve, the input gear is in a transmission disconnected state with the first planetary gear mechanism, and the first planetary gear mechanism is in a transmission disconnected state with the second planetary gear mechanism.

[0008] When the transmission device is in the second power output state, the input gear is connected to the first planetary gear mechanism through the first sliding sleeve, and the first planetary gear mechanism is connected to the output shaft through the second sliding sleeve.

[0009] Furthermore, the second planetary gear mechanism is connected to the output shaft, and the transmission device also has a third power output state. When the transmission device is in the third power output state, the input gear is connected to the first planetary gear mechanism through the first sliding sleeve, and the first planetary gear mechanism is connected to the second planetary gear mechanism through the second sliding sleeve.

[0010] Furthermore, the input gear is detachably connected to the sun gear of the first planetary gear mechanism via the first sliding sleeve, and the planet carrier of the first planetary gear mechanism is detachably connected to the sun gear of the second planetary gear mechanism via the second sliding sleeve.

[0011] Furthermore, the speed change device also includes a first transmission gear, which is fixed on the output shaft;

[0012] When the transmission device is in the first power output state, the first sliding sleeve is connected to the input gear, and the first transmission gear meshes with the first sliding sleeve.

[0013] When the transmission device is in the second power output state, the first sliding sleeve is connected to the input gear and the first planetary gear mechanism.

[0014] Furthermore, the transmission device also includes a second transmission gear, which is fixed on the output shaft.

[0015] When the transmission device is in the second power output state, the input gear is connected to the first planetary gear mechanism through the first sliding sleeve, and the second transmission gear is connected to the first planetary gear mechanism through the second sliding sleeve.

[0016] Furthermore, the speed change device also includes: a plurality of auxiliary input gears, each of which meshes with the input gear.

[0017] Furthermore, the speed change device also includes: multiple driving components, each driving component having a rotating shaft, and each driving component having an auxiliary input gear on its rotating shaft.

[0018] Furthermore, the transmission device also includes: a first output shaft bearing, a second output shaft bearing, and a third output shaft bearing;

[0019] The first output shaft bearing, the second output shaft bearing, and the third output shaft bearing are all mounted on the output shaft. The input gear is connected to the first output shaft bearing. The sun gear of the first planetary gear mechanism is connected to the second output shaft bearing. The sun gear of the second planetary gear mechanism is connected to the third output shaft bearing.

[0020] Compared with the prior art, in the speed change device provided by the present invention, the input gear, the first planetary gear mechanism and the second planetary gear mechanism are rotatably mounted on the output shaft. The input gear is disconnected from the first planetary gear mechanism through the first sliding sleeve, and the first planetary gear mechanism is disconnected from the second planetary gear mechanism through the second sliding sleeve. Therefore, the transmission path between the input gear and the first planetary gear mechanism can be switched on or off by adjusting the first sliding sleeve, and the transmission path between the first planetary gear mechanism and the second planetary gear mechanism can be switched on or off by adjusting the second sliding sleeve.

[0021] Based on this, on the one hand, the first sliding sleeve can be adjusted to make the input gear connected to the output shaft through the first sliding sleeve, while the input gear and the first planetary gear mechanism are in a disengaged state. At the same time, the second sliding sleeve can be adjusted to make the first planetary gear mechanism and the second planetary gear mechanism in a disengaged state. At this time, the power input through the input gear can be directly output through the first sliding sleeve and the output shaft, thus putting the transmission device in the first power output state.

[0022] On the other hand, the first sliding sleeve can be adjusted so that the input gear is connected to the first planetary gear mechanism via the first sliding sleeve, and the first planetary gear mechanism is connected to the output shaft via the second sliding sleeve. At this time, the power input through the input gear can be output through the first sliding sleeve, the first planetary gear mechanism, and then through the output shaft, thereby putting the transmission in the second power output state.

[0023] As can be seen, the speed change device provided by the present invention can switch the power output state of the speed change device through the coordinated adjustment of the first sliding sleeve and the second sliding sleeve, without the need to use multiple drive shafts. Therefore, it can improve the transmission efficiency of the speed change device, while also reducing the structural complexity, making the structure of the speed change device more reliable, and effectively improving the transmission efficiency.

[0024] Furthermore, by comparing the power transmission routes of the first power output state and the second power output state, it can be seen that the power transmission distance of the first power output state is relatively shorter than that of the second power output state. Therefore, the torque output by the transmission device in the first power output state is relatively smaller than the torque output by the transmission device in the second power output state.

[0025] The present invention also provides a vehicle including the above-described transmission device.

[0026] Compared with the prior art, the beneficial effects of the speed change device provided by the present invention are the same as those of the speed change device described in the above technical solutions, and will not be repeated here. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0028] Figure 1 This is a schematic diagram of the transmission device in an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the transmission state structure of the first sliding sleeve and the second sliding sleeve in an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the transmission state structure between another first sliding sleeve and a second sliding sleeve in an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the transmission state structure of another first sliding sleeve and a second sliding sleeve in an embodiment of the present invention.

[0032] Figure label:

[0033] 100 - Speed ​​change device; 10 - Input gear; 11 - First planetary gear mechanism; 12 - Second planetary gear mechanism; 13 - First sliding sleeve; 14 - Second sliding sleeve; 15 - Output shaft; 16 - First transmission gear; 17 - Second transmission gear; 18 - Auxiliary input gear; 19 - First driving component; 20 - Second driving component; 21 - Third driving component; 22 - First output shaft bearing; 23 - Second output shaft bearing; 24 - Third output shaft bearing. Detailed Implementation

[0034] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0035] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0037] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] With the development of new energy vehicle technology, the requirements for the reliability and efficiency of drive systems are gradually increasing. The transmission system is an important component of the drive assembly of new energy vehicles; currently, the transmission mechanism of the transmission system in pure electric heavy trucks is complex, requiring multiple intermediate drive shafts and multiple gears for power transmission, which not only results in low transmission efficiency but also low reliability of the transmission system.

[0040] Please see Figure 1 The speed change device provided in this embodiment of the invention includes: an input gear, a first planetary gear mechanism, a second planetary gear mechanism, a first sliding sleeve, a second sliding sleeve, and an output shaft; the input gear, the first planetary gear mechanism, and the second planetary gear mechanism are rotatably mounted on the output shaft, and the input gear, the first planetary gear mechanism, and the second planetary gear mechanism are distributed along the axial direction of the output shaft; the input gear is disconnectable from the first planetary gear mechanism through the first sliding sleeve, and the first planetary gear mechanism is disconnectable from the second planetary gear mechanism through the second sliding sleeve; the speed change device has a first power output state and a second power output state.

[0041] When the transmission is in the first power output state, the input gear is connected to the output shaft through the first sliding sleeve, driving the output shaft to rotate. At this time, the input gear and the first planetary gear mechanism are in a transmission disconnected state, and the first planetary gear mechanism and the second planetary gear mechanism are in a transmission disconnected state.

[0042] When the transmission is in the second power output state, the input gear is connected to the first planetary gear mechanism through the first sliding sleeve, and the first planetary gear mechanism is connected to the output shaft through the second sliding sleeve.

[0043] It is understandable that the input gear, the first sliding sleeve, the first planetary gear mechanism, the second sliding sleeve, and the second planetary gear mechanism are arranged sequentially along the axial extension direction of the output shaft; the first sliding sleeve is used to transmit the power input through the input gear to the output shaft or the first planetary gear mechanism, that is, the first sliding sleeve can be disconnected from or connected to the first planetary gear mechanism (that is, when the transmission is in the first power output state or the second power output state).

[0044] When the first sliding sleeve is disconnected from the first planetary gear (i.e., in the first power output state): the input gear is connected to the output shaft via the first sliding sleeve, while the input gear and the first planetary gear mechanism are in a power disconnected state. In this case, the power input through the input gear can be directly transmitted to the output shaft through the first sliding sleeve and output through the output shaft. At this time, the power output length of the output shaft is relatively long, therefore, its torque is relatively small.

[0045] When the first sliding sleeve is connected to the first planetary gear (i.e., when the second sliding sleeve is in the second power output state): the first sliding sleeve meshes with the first planetary gear mechanism, and the first sliding sleeve transmits the power of the input gear to the first planetary gear mechanism (i.e. drives the first planetary gear mechanism to rotate). The first planetary gear mechanism cooperates with the second sliding sleeve to transmit power to the second sliding sleeve. The second sliding sleeve is connected to the output shaft, which drives the output shaft to rotate to realize the power transmission. Compared with the power transmission route in the first power output state, the power transmission distance in the second power output state is relatively shorter. Therefore, the torque in the second power output state is greater than the torque in the first power output state.

[0046] As can be seen, the speed change device provided by the present invention can switch the power output state of the speed change device through the coordinated adjustment of the first sliding sleeve and the second sliding sleeve, without the need to use multiple drive shafts. Therefore, it can improve the transmission efficiency of the speed change device, while also reducing the structural complexity, making the structure of the speed change device more reliable, and effectively improving the transmission efficiency.

[0047] In some embodiments, the second planetary gear mechanism is connected to the output shaft. In this case, the transmission may also have a third power output state. When the transmission is in the third power output state, the input gear is driven by the first planetary gear mechanism through the first sliding sleeve, and the first planetary gear mechanism is driven by the second sliding sleeve through the second planetary gear mechanism.

[0048] Understandably, in the third power output state, the rotation of the second planetary gear mechanism can drive the transmission shaft to rotate. The transmission method in the third power output state is as follows: the first sliding sleeve meshes with the first planetary gear mechanism and the output gear, transmitting power to the first planetary gear mechanism; the second sliding sleeve meshes with both the first and second planetary gear mechanisms, driving the second planetary gear mechanism to rotate; and the second planetary gear mechanism is connected to the output shaft. Therefore, when the second planetary gear mechanism rotates, it drives the output shaft to rotate, outputting power through the rotating shaft to achieve power transmission. Compared to the power transmission route in the second power output state, the power transmission distance in the third power output state is relatively shorter. Therefore, the torque in the third power output state is greater than the torque in the second power output state.

[0049] In some embodiments, please refer to Figures 2 to 4 The input gear can be disconnected from the sun gear of the first planetary gear mechanism via the first sliding sleeve, and the planet carrier of the first planetary gear mechanism can be disconnected from the sun gear of the second planetary gear mechanism via the second sliding sleeve.

[0050] The disengageable connection between the first sliding sleeve and the first planetary gear mechanism is achieved as follows: a first sleeve is fixedly installed on the side of the sun gear of the first planetary gear mechanism near the input gear, and the inner wall of the first sleeve is provided with internal teeth. When the input gear is connected to the sun gear of the first planetary gear mechanism through the first sliding sleeve, the first sliding sleeve can slide into the first sleeve, so that the outer teeth of the first sliding sleeve mesh with the internal teeth, thereby causing the first sliding sleeve to drive the sun gear of the first planetary gear mechanism to rotate.

[0051] The sun gear of the first planetary gear mechanism has a second sleeve on the side opposite to the input gear, and the inner wall of the second sleeve is provided with internal teeth. When it is necessary to transmit power to the second planetary gear, the second sliding sleeve can slide into the second sleeve, so that the outer teeth of the second sliding sleeve mesh with the inner teeth of the second sleeve, thereby causing the first planetary gear mechanism to drive the sun gear of the second planetary gear mechanism to rotate.

[0052] The disengageable connection between the second sliding sleeve and the second planetary gear mechanism is achieved as follows: a third sleeve is fixedly installed on one side of the sun gear of the second planetary gear mechanism, and the inner wall of the third sleeve is provided with internal teeth. When the first planetary gear mechanism is connected to the sun gear of the second planetary gear mechanism through the second sliding sleeve, both ends of the second sliding sleeve slide into the second sleeve and the third sleeve respectively, so that the external teeth of the second sliding sleeve mesh with the internal teeth of the second sliding sleeve and the third sliding sleeve respectively, thereby causing the second sliding sleeve to drive the sun gear of the second planetary gear mechanism to rotate.

[0053] Considering that both the first and second sliding sleeves achieve the connection and disconnection of the transmission path through sliding, different transmission states can be adjusted by sliding the first and second sliding sleeves and changing their positions. The first sliding sleeve has two transmission positions on the transmission shaft: a first transmission position and a second transmission position. When the first sliding sleeve is in either the first or second transmission position, the following functions / effects are achieved:

[0054] When the first sliding sleeve is in the first transmission position (i.e., the first power output state), the first sliding sleeve is disconnected from the first planetary gear mechanism; the first sliding sleeve is connected to the output shaft, and the power is output through the output shaft. At this time, the torque and power of the transmission device are relatively small, and the transmission is relatively economical.

[0055] When the first sliding sleeve is in the second transmission position, the first sliding sleeve transmits power to the first planetary gear mechanism, driving the first planetary gear mechanism to rotate. The transmission method after connecting with the first planetary gear mechanism is described below.

[0056] The second sliding sleeve has three transmission positions on the drive shaft: the third, fourth, and fifth transmission positions. Adjusting the transmission position of the second sliding sleeve requires the first sliding sleeve to be in the second transmission position. When the first sliding sleeve is in the second transmission position, adjusting the transmission position of the second sliding sleeve can achieve the following functions / effects:

[0057] When the second sliding sleeve is in the third transmission position, the second sliding sleeve engages with the output shaft, drives the output shaft to rotate, and outputs power through the output shaft. At this time, the torque and power of the transmission device are greater than those in the first power output state.

[0058] When the second sliding sleeve is in the fourth transmission position, the second sliding sleeve does not participate in power transmission and is in an idle state. Its specific transmission state is: the second sliding sleeve meshes with the first planetary gear mechanism, but does not mesh with the second planetary gear mechanism, that is, the second sliding sleeve is in an idle state, the output shaft does not rotate, and no power output is generated.

[0059] When the second sliding sleeve is in the fifth transmission position, the second sliding sleeve meshes with the first planetary gear mechanism and the second planetary gear mechanism respectively to transmit power to the second planetary gear mechanism. The second planetary gear mechanism is connected to the output shaft, which in turn drives the output shaft to rotate and output power. At this time, the torque and power of the transmission device are at their maximum.

[0060] It should be noted that, without adjusting the transmission mechanism (in the initial state), the first sliding sleeve is located in the second transmission position and the second sliding sleeve is located in the fourth transmission position to improve the safety of the transmission device.

[0061] In some embodiments, the transmission device further includes a first transmission gear fixed to the output shaft. When the transmission device is in the first power output state, the first sliding sleeve is connected to the input gear, and the first transmission gear meshes with the first sliding sleeve.

[0062] Understandably, the first transmission gear is mounted on the output shaft and located between the input gear and the first planetary gear mechanism, and can be close to the side of the input gear. When the first sliding sleeve is in the first transmission position (i.e. the first power output state), the first sliding sleeve meshes with the first transmission gear, so that the first sliding sleeve drives the first transmission gear to rotate, and then the first transmission gear drives the output shaft to rotate, so that the power is output through the output shaft. At this time, the torque and power of the transmission device are relatively small.

[0063] In some embodiments, the transmission device further includes a second transmission gear, which is fixed on the output shaft; when the transmission device is in the second power output state, the input gear is connected to the first planetary gear mechanism through a first sliding sleeve, and the second transmission gear is connected to the first planetary gear mechanism through a second sliding sleeve.

[0064] Understandably, the second transmission gear is mounted on the output shaft and located between the first planetary gear mechanism and the second planetary gear mechanism. When the first sliding sleeve is in the second transmission position and the second sliding sleeve is in the third transmission position (i.e., the second power output state), the input gear transmits power to the first planetary gear mechanism by driving the first sliding sleeve to rotate. At this time, the first planetary gear mechanism drives the second sliding sleeve to rotate, and the second sliding sleeve meshes with the second transmission gear, thereby driving the second transmission gear to rotate, so as to output power through the output shaft. At this time, the torque and power of the transmission device are greater than those in the first power output state, in order to adapt to different working conditions and transmission requirements.

[0065] In some embodiments, the transmission device further includes: a plurality of auxiliary input gears, each auxiliary input gear meshing with an input gear; the auxiliary input gear meshing with the input gear to drive the input gear to rotate, and the input gear being used to connect / cooperate with a power unit to provide power to the input gear.

[0066] For example, the transmission device further includes: a plurality of drive members, each drive member being connected to an auxiliary input gear. Each drive member has a rotating shaft on which an auxiliary input gear is disposed, the auxiliary input gear meshing with an input gear to cause the drive member to drive the input gear to rotate. Optionally, the drive members can be an electric motor or an internal combustion engine, etc., but are not limited thereto.

[0067] In the speed change device provided in this embodiment of the invention, the combined drive components can have multiple driving states. The following description uses three drive components and three auxiliary input gears as an example to illustrate that it can specifically have any of the following driving states:

[0068] 1. Single drive component drive: The rotation of any one of the first, second, or third drive components drives the auxiliary input gear to rotate. In this case, the power is relatively small, but it is more economical.

[0069] Second, it is driven by two driving components, namely, the first driving component and the second driving component rotate, or the first driving component and the third driving component rotate, or the second driving component and the third driving component rotate, which drives the auxiliary input gear to rotate.

[0070] Third, multiple driving components drive the rotation of the first, second, and third driving components, which in turn drive the auxiliary input gear to rotate.

[0071] The three different drive modes mentioned above can be selected according to the working conditions. Specifically, when high power and high torque output is required, the first, second, and third drive components all work to drive the transmission motion; when medium power and medium torque are required, two of the drive components work to drive the transmission device; when low power and low torque are required, only a single drive component needs to work. Setting multiple drive modes can make the drive power adapt to the actual operating conditions to the maximum extent, increase the optimal drive ratio time, and improve drive economy.

[0072] In some embodiments, the transmission device further includes: a first output shaft bearing, a second output shaft bearing, and a third output shaft bearing; the input gear is connected to the first output shaft bearing, the sun gear of the first planetary gear mechanism is connected to the second output shaft bearing, and the sun gear of the second planetary gear mechanism is connected to the third output shaft bearing.

[0073] Understandably, the first, second, and third output shaft bearings are sequentially arranged along the axial extension of the output shaft. The first output shaft bearing is located on the input gear, the second output shaft bearing is located on the first planetary gear mechanism, and the third output shaft bearing is located on the second planetary gear mechanism. The first, second, and third output shaft bearings are used to support the rotation of the input gear, the first planetary gear mechanism, and the second planetary gear mechanism, and to reduce friction with the output shaft, making the rotation of the input gear, the first planetary gear mechanism, and the second planetary gear mechanism smoother, while also reducing power consumption.

[0074] To more clearly illustrate the differences in transmission methods in this invention, please refer to the table below:

[0075]

[0076] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0077] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A speed-changing device, characterized in that, The speed change device includes an input gear, a first planetary gear mechanism, a second planetary gear mechanism, a first sliding sleeve, a second sliding sleeve, and an output shaft; The input gear, the first planetary gear mechanism, and the second planetary gear mechanism are rotatably mounted on the output shaft; the input gear, the first planetary gear mechanism, and the second planetary gear mechanism are distributed along the axial direction of the output shaft; the input gear is detachably connected to the first planetary gear mechanism through the first sliding sleeve; the first planetary gear mechanism is detachably connected to the second planetary gear mechanism through the second sliding sleeve; the transmission device has a first power output state and a second power output state. When the transmission device is in the first power output state, the input gear is connected to the output shaft through the first sliding sleeve, the input gear is in a transmission disconnected state with the first planetary gear mechanism, and the first planetary gear mechanism is in a transmission disconnected state with the second planetary gear mechanism. When the transmission device is in the second power output state, the input gear is connected to the first planetary gear mechanism through the first sliding sleeve, and the first planetary gear mechanism is connected to the output shaft through the second sliding sleeve. The second planetary gear mechanism is connected to the output shaft. The transmission device also has a third power output state. When the transmission device is in the third power output state, the input gear is connected to the first planetary gear mechanism through the first sliding sleeve, and the first planetary gear mechanism is connected to the second planetary gear mechanism through the second sliding sleeve. The input gear is detachably connected to the sun gear of the first planetary gear mechanism via the first sliding sleeve, and the planet carrier of the first planetary gear mechanism is detachably connected to the sun gear of the second planetary gear mechanism via the second sliding sleeve.

2. The speed change device according to claim 1, characterized in that, The speed change device further includes a first transmission gear, which is fixed on the output shaft; When the transmission device is in the first power output state, the first sliding sleeve is connected to the input gear, and the first transmission gear meshes with the first sliding sleeve. When the transmission device is in the second power output state, the first sliding sleeve is connected to the input gear and the first planetary gear mechanism.

3. The speed change device according to claim 1, characterized in that, The speed change device also includes a second transmission gear, which is fixed on the output shaft; When the transmission device is in the second power output state, the input gear is connected to the first planetary gear mechanism through the first sliding sleeve, and the second transmission gear is connected to the first planetary gear mechanism through the second sliding sleeve.

4. The speed change device according to claim 1, characterized in that, The speed change device further includes: a plurality of auxiliary input gears, each of which meshes with the input gear.

5. The speed change device according to claim 4, characterized in that, The speed change device further includes: multiple driving components, each driving component having a rotating shaft, and each driving component having an auxiliary input gear on its rotating shaft.

6. The speed change device according to claim 1, characterized in that, The speed change device further includes: a first output shaft bearing, a second output shaft bearing, and a third output shaft bearing; The first output shaft bearing, the second output shaft bearing, and the third output shaft bearing are all disposed on the output shaft; the input gear is connected to the first output shaft bearing, the sun gear of the first planetary gear mechanism is connected to the second output shaft bearing, and the sun gear of the second planetary gear mechanism is connected to the third output shaft bearing.

7. A vehicle, characterized in that, include: The speed change device as described in any one of claims 1 to 6.

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