Power decoupling device, transmission system and vehicle

Abstract

The application provides a power decoupling device, a transmission system and a vehicle. The power decoupling device comprises a first shaft (10), a second shaft (30), a sleeve (20) and an actuator (40), the actuator (40) comprises a poking body and a rolling body, the poking body is arranged in a second direction, and the rolling body is arranged between the poking body and the sleeve (20), abuts against the sleeve (20) and is adapted to be driven to rotate by the sleeve (20). By arranging the rolling body between the poking body and the sleeve, the transmission efficiency and reliability of the power decoupling device are improved.

Description

Technical Field

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

[0002] Energy consumption and efficiency are important indicators of vehicle performance. Vehicles in four-wheel drive mode have sufficient power and stability when dealing with conditions such as climbing hills, off-roading, and rapid acceleration. However, in daily urban traffic congestion or low-speed conditions, two-wheel drive mode is more suitable for the daily needs of hybrid and pure electric vehicles. In order to balance energy consumption and performance and realize the switching between two-wheel drive mode and four-wheel drive mode under different operating conditions, a power decoupling device is often installed on the power transmission path of the vehicle's auxiliary drive shaft. The power decoupling device usually has a reset mechanism, which disconnects or engages the power transmission shaft by moving the reset mechanism. The reciprocating motion of the reset mechanism will bring unwanted friction, making the reset mechanism prone to wear. At the same time, the execution of the reset action often affects the transmission efficiency of the mechanism. Therefore, there is an urgent need for a power decoupling device that eliminates the reset mechanism to improve reliability and power transmission efficiency. Summary of the Invention

[0003] One of the objectives of this invention is to provide a power decoupling device to solve the technical problems of easy wear of the reset mechanism and low transmission efficiency caused by the reset mechanism performing the reset action in the prior art.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A power decoupling device is provided, comprising a first shaft and a second shaft, the first shaft and the second shaft being coaxially arranged along a first direction; a sleeve, the sleeve being fixedly connected to the first shaft in the circumferential direction and slidably connected in the first direction, the second shaft and the sleeve being adapted to switch between an engaged state and a disengaged state; an actuator, the actuator comprising a actuating body and a rolling body, the actuating body being arranged along a second direction, the rolling body being disposed between the actuating body and the sleeve, abutting against the sleeve and adapted to be driven to rotate by the sleeve; the first direction is the axial direction of the first shaft, and the second direction is orthogonal to the first direction. The beneficial effect of the above solution is that by arranging the rolling body between the actuating body and the sleeve, and the rolling body being adapted to be driven to rotate by the rolling friction between the other sleeves, the actuator can still contact the sleeve even when the sleeve is rotating, without generating sliding friction that would cause wear on components, thereby eliminating the reset mechanism in existing power decoupling devices and improving the transmission efficiency and reliability of the power decoupling device.

[0005] In conjunction with the first aspect above, in one possible implementation, the sleeve is provided with a rolling groove in the circumference, the rolling element is disposed in the rolling groove, abuts against the side wall of the rolling groove, and rotates about the axis of the actuating body.

[0006] In conjunction with the first aspect above, in one possible implementation, the rolling element is a bearing, which is sleeved on the actuating body near the end face of the sleeve.

[0007] In conjunction with the first aspect above, in one possible implementation, the rolling element is a ball bearing, and the actuating body is provided with a groove, in which the ball bearing is embedded.

[0008] In conjunction with the first aspect above, in one possible implementation, the actuating body is a lead screw nut, the actuator further includes a lead screw, the lead screw is arranged along the first direction, and the lead screw nut is engaged with the lead screw.

[0009] In conjunction with the first aspect above, in one possible implementation, the actuator further includes a motor for controlling the rotation of the lead screw.

[0010] In conjunction with the first aspect above, in one possible implementation, the actuator further includes a reduction gear assembly disposed between the motor and the lead screw, with the input end of the reduction gear assembly fixedly connected to the motor and the output end of the reduction gear assembly meshing with the lead screw.

[0011] In conjunction with the first aspect above, in one possible implementation, the motor shaft of the motor is arranged along the second direction, the reduction assembly includes a first gear and a second gear, the first gear is fixedly connected to the motor shaft of the motor, the gear shaft of the second gear is arranged along the first direction, one end of the second gear meshes with the first gear, and the other end meshes with the lead screw.

[0012] In conjunction with the first aspect above, in one possible implementation, the rolling element is a planar bearing, which is sleeved on the sleeve and rotates about the axis of the sleeve, and the actuating body abuts against one side of the planar bearing.

[0013] In conjunction with the first aspect described above, one possible implementation further includes a housing and a guide device, wherein the actuator is located within the housing, and the guide device is fixedly connected to the housing to limit the displacement of the actuating body.

[0014] A second aspect of the invention is to provide a transmission system including the power decoupling device as described in the first aspect above.

[0015] A third aspect of the invention is to provide a vehicle comprising a power decoupling device as described in the first aspect above or a transmission system as described in the second aspect above. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a cross-sectional schematic diagram of a power decoupling device according to a specific example of the present invention;

[0018] Figure 2 This is a schematic diagram of the overall appearance of a power decoupling device according to a specific example of the present invention;

[0019] Figure 3 This is a schematic diagram of a guide device for a power decoupling device according to a specific example of the present invention.

[0020] The reference numerals in the attached figures are as follows:

[0021] 10-First shaft; 20-Sleeve; 30-Second shaft; 40-Actuator; 411-Controller cover; 412-Control board; 421-Magnet; 422-Brushless motor; 423-Motor shaft gear; 431-End face gear; 432-Lead screw; 433-Lead screw nut; 434-Bearing; 50-Housing; 60-Motor housing; 61-Guiding device. Detailed Implementation

[0022] 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.

[0023] 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.

[0024] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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 the present 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 the present invention.

[0025] 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 technical features indicated. 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.

[0026] The present invention will now describe a power decoupling device according to an embodiment of the present invention. (See reference...) Figure 1 and Figure 2 As shown, a power decoupling device includes: a first shaft 10 and a second shaft 30, the first shaft 10 and the second shaft 30 being coaxially arranged along a first direction; a sleeve 20, the sleeve 20 being fixedly connected to the first shaft 10 in the circumferential direction and slidably connected in the first direction, the second shaft 30 and the sleeve 20 being adapted to switch between an engaged state and a disengaged state; an actuator 40, the actuator 40 including a actuating body and a rolling body, the actuating body being arranged along a second direction, the rolling body being disposed between the actuating body and the sleeve 20, abutting against the sleeve 20 and adapted to be driven to rotate by the sleeve 20; the first direction is the axial direction of the first shaft 10, and the second direction is orthogonal to the first direction.

[0027] In the above embodiments, by setting a rolling element between the actuating body and the sleeve, rolling friction is used instead of sliding friction, which significantly reduces the wear of internal components of the device and extends its service life. At the same time, by eliminating the reset mechanism, the device structure is simplified, the time required for the actuator to perform and reset is reduced, thereby improving the power transmission efficiency, enhancing system reliability, and achieving comprehensive coverage of working conditions.

[0028] In some embodiments, the sleeve 20 is provided with a rolling groove in its circumference, and the rolling element is disposed in the rolling groove, abutting against the side wall of the rolling groove, and rotating about the axis of the actuating body. This design reduces the contact area through the line contact design between the rolling groove and the rolling element, thereby reducing the friction between the rolling groove and the rolling element and extending the service life of the device.

[0029] In some embodiments, the rolling element is a bearing 434, which is sleeved on the actuating body near the end face of the sleeve 20.

[0030] Specifically, in some embodiments, deep groove ball bearings are used as rolling elements, with the inner ring fixed to the end face of the actuating body and the outer ring engaging with the rolling groove of the sleeve. Compared with the sliding friction generated by traditional actuators, the coefficient of friction is significantly reduced.

[0031] In some embodiments, the rolling element is a ball bearing, the actuating body is provided with a groove, the ball bearing is embedded in the groove, the ball bearing is adapted to be displaced by the actuating body, and can rotate 360°.

[0032] Furthermore, in some embodiments, the rolling groove of the sleeve 20 is a U-shaped or inverted Ω-shaped cross-section groove, and the ball is assembled in the rolling groove. This design further compresses the contact area between the rolling groove and the rolling element, minimizing friction.

[0033] In some embodiments, the actuating body is a lead screw nut 433, and the actuator 40 further includes a lead screw, which is arranged along the first direction, and the lead screw nut 433 meshes with the lead screw. The lead screw adopts a trapezoidal thread design, which significantly improves the transmission efficiency compared with the traditional worm gear structure.

[0034] In some embodiments, the rolling element is a planar bearing, which is sleeved on the sleeve 20 and rotates about the axis of the sleeve 20. The actuating element abuts against one side of the planar bearing. This solution replaces traditional sliding contact with rolling contact of the planar bearing, reducing the coefficient of friction to the range of 0.001-0.003, and significantly extending the service life of the device.

[0035] In some embodiments, the outer ring surface of the planar bearing is provided with a lubrication groove to achieve self-lubrication and reduce maintenance frequency.

[0036] In some embodiments, the planar bearing adopts a double-row angular contact ball bearing structure, with its inner ring fixedly sleeved on the outer surface of the sleeve 20 and its outer ring in contact with the side of the actuating body. When the sleeve 20 moves axially, the planar bearing rotates synchronously with the sleeve 20, forming a pure rolling contact between the actuating body and the sleeve 20. This design increases the contact area of ​​the friction pair to 2.5 times that of a traditional sliding structure, while reducing friction loss through rolling contact.

[0037] In some embodiments, the actuator further includes a motor 422, which drives the actuator to perform a toggle action and controls the movement of the sleeve 20.

[0038] In some embodiments, motor 422 is a brushless DC motor with a built-in Hall sensor to monitor the rotor position in real time. Combined with a PID algorithm, it achieves closed-loop control of the sleeve position, with a positioning accuracy of ±0.1mm. Brushless motors are characterized by high efficiency and long lifespan, meeting the requirements of electrification platforms for new energy vehicles.

[0039] In some embodiments, the actuator 40 further includes a reduction gear assembly disposed between the motor and the lead screw 432. The input end of the reduction gear assembly is fixedly connected to the motor, and the output end of the reduction gear assembly meshes with the lead screw 432. The reduction gear assembly uses a planetary gear set with a reduction ratio set to 10:1, thereby increasing the output torque of the lead screw 432 to 100 Nm.

[0040] In some embodiments, the motor shaft of the motor is arranged along the second direction, and the reduction assembly includes a first gear and a second gear. The first gear is fixedly connected to the motor shaft of the motor, and the gear shaft of the second gear is arranged along the first direction. One end of the second gear meshes with the first gear, and the other end meshes with the lead screw. This structure reduces the overall size of the actuator.

[0041] In some embodiments, the lead screw 432 is a ball screw 432, which is connected to the actuating body, and the brushless motor 422 drives the ball screw 432 to achieve linear motion. This solution controls the stroke of the lead screw nut by reversing the motor, eliminating the need for additional reset components and resulting in a more compact system structure.

[0042] In some embodiments, the device further includes an integrated controller and a Hall sensor. The Hall sensor is disposed on the lead screw nut 433 of the actuator to detect the position of the lead screw nut 433 and feed it back to the controller, which then controls the rotation direction and angle of the motor. This solution indirectly measures the actuation position using a Hall sensor, improving position accuracy and avoiding the need for an additional position sensor structure on the rotating shaft.

[0043] In some embodiments, the circumferential fixed connection between the sleeve 20 and the first shaft 10 adopts a keyway fit structure, and the sliding connection of the sleeve 20 in the first direction is achieved by a linear bearing. This solution ensures the stability of the sleeve 20 during axial movement while reducing frictional resistance.

[0044] In some embodiments, the mating surfaces of the actuating body and the sleeve 20 are provided with a wear-resistant coating, and the rolling surface of the rolling body is treated with a carburizing process. This solution further improves wear resistance and extends the service life of the device through surface treatment technology.

[0045] This application also provides a power decoupling device, such as... Figure 3 As shown, the device also includes a guide device 61, which is fixed to the motor housing 60 and is used to limit the rotational movement of the lead screw nut 433. When the ball screw 432 rotates, the lead screw nut 433 moves linearly along the axial direction of the ball screw 432. This solution ensures the linear motion accuracy of the lead screw nut 433 through the limiting effect of the guide device 61, and avoids wear caused by misalignment.

[0046] In some embodiments, the guiding device 61 includes an input shaft with a long tooth profile and two small guide rods above the lead screw nut 433. This design utilizes the long tooth profile of the input shaft as a guiding surface, in conjunction with the guide rods on the lead screw nut 433, saving vertical space and making the overall structure simpler and more compact.

[0047] In some embodiments, the tooth width of the long tooth profile of the input shaft is 5-8 mm, and the diameter of the small guide rod is 3-5 mm. This solution achieves a more compact spatial arrangement by optimizing the parameters of the guide device 61.

[0048] In some embodiments, the brushless motor 422 and the ball screw 432 are directly connected via a coupling, and the fixed end of the ball screw 432 is mounted on the housing 50 via a bearing seat. This solution achieves high efficiency in power transmission and reduces energy loss.

[0049] In some embodiments, the engagement or disengagement of the sleeve 20 and the second shaft 30 is achieved through a spline engagement, wherein the sleeve 20 engages or disengages the spline teeth during axial movement. This design ensures reliable power transmission while reducing meshing impact.

[0050] This application embodiment also provides a power decoupling device, the rolling element of which is a planar bearing, the planar bearing is sleeved on the sleeve 20 and rotates around the axis of the sleeve 20, and the actuating body abuts against one side of the planar bearing.

[0051] In some embodiments, the sleeve 20 is provided with a cage in the circumferential direction, and the flat bearing balls are arranged in the circumferential direction within the cage to increase the contact area, which is suitable for high torque conditions.

[0052] In some embodiments, the inner ring of the planar bearing is fixed to the outer surface of the sleeve 20 by an interference fit, and the outer ring is in contact with the side of the actuating body.

[0053] In some embodiments, the outer ring surface of the planar bearing is provided with a spiral lubrication groove, the width of which is 0.2-0.5 mm and the depth is 0.05-0.1 mm. This solution achieves self-lubrication through the lubrication groove, reducing maintenance frequency.

[0054] In some embodiments, the power decoupling device further includes a housing 50 and a guide device 61, wherein the actuator 40 is located within the housing 50, and the guide device is fixedly connected to the housing 50 to limit the displacement of the actuating body.

[0055] In some embodiments, the power decoupling device includes an actuator, a motor shaft gear 423, a motor housing 60, a guide device 61, and a bearing 434. In the above embodiments, the movement of the moving sleeve is achieved by driving the ball screw 432 with a brushless motor, which can effectively improve the life of the moving element, reduce wear, and improve overall efficiency.

[0056] In some embodiments, the actuator includes a face gear 431, a lead screw 432, a lead screw nut 433, and a bearing 434. This design transmits the rotational motion of the motor to the lead screw 432 through the meshing of the face gear 431 with the motor shaft gear 423. The lead screw nut 433 moves axially on the lead screw 432, thereby driving the sleeve 20 to engage or disengage power. This design simplifies the structure and improves efficiency by integrating the controller, sensor, and actuator.

[0057] In some embodiments, the end face gear 431 is connected to the motor shaft gear 423 as a reducer for the motor. It is supported on the motor housing 60 by bearings. This solution reduces the motor speed and increases the torque output through the reducer structure, while ensuring the stable operation of the end face gear 431.

[0058] In some embodiments, the lead screw 432 is a ball screw connected to the end face gear 431, which transmits the rotational motion of the motor to the lead screw 432. The lead screw nut 433 is installed on the lead screw 432. This scheme converts the rotational motion into linear motion through the high transmission efficiency of the ball screw 432, driving the sleeve 20 to move axially.

[0059] In some embodiments, the bearing 434 is disposed below the lead screw nut 433 and abuts against the sleeve 20. When the sleeve 20 rotates, the bearing 434 is driven to rotate. This solution reduces the friction between the sleeve 20 and the lead screw nut 433 through the rolling contact of the bearing 434, thereby extending the service life.

[0060] This application also provides a power decoupling device, such as... Figure 1 As shown, the device includes a motor housing 60, a guide device 61, and a bearing 434. The motor housing 60 is used to fix the motor shaft gear 423 and the end face gear 431. The guide device 61 is fixed to the motor housing 60 by bolts. The bearing 434 is axially positioned and installed below the lead screw nut 433, forming rolling contact with the sleeve 20.

[0061] In some embodiments, the guide device 61 adopts a linear guide structure, and the rotation of the lead screw nut 433 is limited by the cooperation of the slider and the slide rail, ensuring its stability along the axial direction. In some embodiments, the bearing 434 is a deep groove ball bearing, which is fixed to the motor housing 60 by the outer ring and the inner ring contacts the sleeve 20 to reduce the frictional resistance when the sleeve 20 rotates.

[0062] This application also provides a power decoupling device, such as... Figure 1 As shown, the device includes a ball screw 432 and an end gear 431. The ball screw 432 is connected to the end gear 431 via a coupling. The end gear 431 is fixed to the motor shaft gear 423 via a key connection. This solution ensures the synchronous rotation of the end gear 431 and the motor shaft gear 423 through the key connection, thus avoiding slippage.

[0063] This application also provides a power decoupling device, such as... Figure 1 As shown, the device includes a sleeve 20 and a bearing 434. The sleeve 20 is connected to the drive shaft via a spline, and the bearing 434 is installed below the lead screw nut 433 by an interference fit. When the sleeve 20 rotates, the bearing 434 rotates synchronously with the sleeve 20. This design reduces the friction between the sleeve 20 and the lead screw nut 433 through the rolling contact of the bearing 434, avoiding wear caused by direct contact.

[0064] In some embodiments, the outer ring of the bearing 434 is threadedly fixed to the motor housing 60, and the inner ring contacts the outer surface of the sleeve 20 to ensure the axial positioning of the bearing 434. This application also provides a power decoupling device, such as... Figure 1 As shown, the device includes a motor housing 60 and a guide device 61. The motor housing 60 is fixed to the frame with screws. The slide rail of the guide device 61 is integrally formed with the motor housing 60. This solution improves the rigidity of the guide device 61 through the overall structural design and reduces the impact of vibration on the movement of the lead screw nut 433.

[0065] In some embodiments, a lubrication groove is provided between the slider and the slide rail of the guide device 61 to reduce frictional resistance by periodically adding grease.

[0066] In some embodiments, the power decoupling device includes an end face gear 431 and a motor shaft gear 423. The end face gear 431 is connected to the motor shaft gear 423 via a keyway. This solution ensures synchronous rotation of the end face gear 431 and the motor shaft gear 423 through keyway cooperation, avoiding power transmission failure due to slippage.

[0067] In some embodiments, such as Figure 2As shown, the power decoupling device uses the actuator 40 to move the movable gear sleeve 20 to disconnect or engage the half-shaft wheel end with the differential. The actuator 40 is fixed to the motor housing 60, and the motor housing 60 is bolted to the disconnecting mechanism housing 50. The actuator 40 consists of a controller assembly 41, a motor assembly 42, and a moving mechanism 43. The controller assembly 41 includes a controller cover 411 and a control board 412. The controller cover 411 is fixed to the motor housing 60 by a snap-fit ​​structure and includes an integrated electrical connector for control and power supply. The motor assembly 42 includes a magnet 421, a brushless motor 422, and a motor shaft gear 423. The magnet 421 is fixed to the rotor shaft of the brushless motor 422. The Hall sensor on the control board 412 can detect the motor rotation angle and indirectly measure the moving distance of the actuating element to determine the engagement or disengagement status of the wheel end disconnection device. The motor shaft 423 is fixed to the rotor shaft of the brushless motor 422 and meshes with the end face gear 431 in the lower actuating mechanism 43 to achieve speed reduction and torque increase of the brushless motor.

[0068] This application also provides a transmission system that includes the aforementioned power decoupling device.

[0069] In some embodiments, when the transmission system is applied to a hybrid electric vehicle, the power decoupling device is located between the drive motor and the differential, and the power flow is quickly switched by controlling the drive motor.

[0070] This application also provides a vehicle that includes the aforementioned power decoupling device or transmission system. This vehicle can efficiently switch between two-wheel drive and four-wheel drive modes.

[0071] In some embodiments, the power decoupling device is integrated at the rear axle wheel end of the vehicle, and the power distribution between the front and rear axles is realized through motor control, which effectively shortens the response time of the four-wheel drive system.

[0072] Although one or more specific embodiments of this disclosure have been shown and described, equivalent variations and modifications will occur to those skilled in the art upon reading and understanding this specification and the accompanying drawings. This disclosure includes all such modifications and variations and is limited only by the scope of the claims. In particular, with respect to the various functions performed by the components described above (e.g., elements, resources, etc.), unless otherwise indicated, the terminology used to describe such components is intended to correspond to any component (functionally equivalent) that performs the specific function of the described component, even if structurally not equivalent to the disclosed structure. Furthermore, although specific features of this disclosure may have been disclosed with respect to only one of several implementations, such features may be combined with one or more other features of other implementations, as may be desired and advantageous for any given or particular application. Moreover, with regard to the terms “comprising,” “owning,” “having,” “having,” or variations thereof as used in the specific embodiments or claims, such terms are intended to be inclusive in a manner similar to the term “including.”

[0073] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

[0074] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A power decoupling device, characterized in that, include: A first shaft (10) and a second shaft (30), wherein the first shaft (10) and the second shaft (30) are coaxially arranged along a first direction; Sleeve (20), the sleeve (20) is fixedly connected to the first shaft (10) in the circumferential direction and slidably connected in the first direction, the second shaft (30) and the sleeve (20) are adapted to switch between an engaged state and an unengaged state; An actuator (40) includes a deflector and a rolling element. The deflector is arranged along a second direction, and the rolling element is arranged between the deflector and the sleeve (20), abutting against the sleeve (20) and adapted to be driven to rotate by the sleeve (20). The first direction is the axial direction of the first axis (10), and the second direction is orthogonal to the first direction.

2. The power decoupling device according to claim 1, characterized in that, The sleeve (20) is provided with a rolling groove in the circumference, and the rolling body is disposed in the rolling groove, abutting against the side wall of the rolling groove, and rotating around the axis of the actuating body.

3. The power decoupling device according to claim 2, characterized in that, The rolling element is a bearing (434), which is sleeved on the end face of the actuating body near the sleeve (20).

4. The power decoupling device according to claim 2, characterized in that, The rolling element is a ball bearing, and the actuating body is provided with a groove, in which the ball bearing is embedded.

5. The power decoupling device according to claim 2, characterized in that, The actuating body is a lead screw nut (433), and the actuator (40) also includes a lead screw (432). The lead screw (432) is arranged along the first direction, and the lead screw nut (433) is engaged with the lead screw (432).

6. The power decoupling device according to claim 5, characterized in that, The actuator (40) further includes a motor (422) for controlling the rotation of the lead screw (432).

7. The power decoupling device according to claim 6, characterized in that, The actuator (40) further includes a reduction assembly, which is disposed between the motor (422) and the lead screw (432). The input end of the reduction assembly is fixedly connected to the motor (422), and the output end of the reduction assembly is engaged with the lead screw (432).

8. The power decoupling device according to claim 7, characterized in that, The motor shaft of the motor (422) is arranged along the second direction. The reduction assembly includes a first gear and a second gear. The first gear is fixedly connected to the motor shaft of the motor (422). The gear shaft of the second gear is arranged along the first direction. One end of the second gear meshes with the first gear, and the other end meshes with the lead screw (432).

9. The power decoupling device according to claim 1, characterized in that, The rolling element is a planar bearing, which is sleeved on the sleeve (20) and rotates around the axis of the sleeve (20). The actuating body abuts against one side of the planar bearing.

10. The power decoupling device according to claim 1, characterized in that, It also includes a housing (50) and a guide device, wherein the actuator (40) is located inside the housing and the guide device is fixedly connected to the housing (50) for limiting the displacement of the actuating body.

11. A transmission system, characterized in that, Includes the power decoupling device as described in any one of claims 1-10.

12. A vehicle, characterized in that, Includes the power decoupling device as described in any one of claims 1-10 or the transmission system as described in claim 11.

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