Aeronautical constant-moment dual-mode linear drive device and method

Abstract

The application belongs to the field of rotary actuation, and particularly relates to an aviation constant-torque double-mode linear driving device and method. The device comprises a ball screw pair assembly, a two-stage speed reducer assembly, a torque limiter assembly, two 2K planetary gear reducer assemblies, a steel ball type return-free assembly, a motor and a shell. The motor is connected with an input shaft of the first-stage 2K planetary gear reducer assembly, a gear ring II of the first-stage 2K planetary gear reducer assembly is installed on the shell, the first-stage and second-stage 2K planetary gear reducer assemblies are connected in series, a gear ring I of the second-stage 2K planetary gear reducer assembly is engaged with a gear of the steel ball type return-free assembly, a planetary carrier I of the second-stage 2K planetary gear reducer assembly is engaged with an input shaft of the torque limiter assembly, an output gear of an output shell of the torque limiter assembly is fitted with a gear of a high-speed gear of the two-stage speed reducer assembly, and a low-speed gear of the two-stage speed reducer assembly is connected with a ball nut of the ball screw pair assembly through a key.

Description

Technical Field

[0001] This invention belongs to the field of rotary actuation, specifically relating to an aerospace constant torque dual-mode linear drive device and method. Background Technology

[0002] Linear drive units are an important component of mechanical opening and closing systems such as aircraft cabin doors, controlling the opening and closing of aircraft cabin doors through the displacement of their own parts.

[0003] With the rise of the low-altitude economy, the advantages of drones in transportation have been gradually discovered. Therefore, efficient and reliable linear drive systems are crucial for the flight safety of drones and the normal transportation of goods. Existing aircraft linear drive systems typically adopt a hydraulic structure design. While this structure can provide relatively reliable driving force, it is subject to the risk of leakage, and is also relatively heavy and has limited functionality. Mechanical drive systems of the same volume can provide more functions, have more stable output, lower cost, and are lighter. Summary of the Invention

[0004] This invention provides an aerospace constant torque dual-mode linear drive device and method, which can realize the function of opening / closing aircraft doors through two modes (manual and electric). Furthermore, when the external load exceeds the constant torque device threshold, the constant torque device protects the fuselage structure and linear actuator from damage by slipping.

[0005] An aerospace constant torque dual-mode linear drive device is provided, comprising: a ball screw assembly, a two-stage reducer assembly, a torque limiter assembly, two 2K ​​planetary gear reducer assemblies, a steel ball type non-return assembly, a motor, and a housing; The motor is connected to the input shaft of the first-stage 2K planetary gear reducer assembly. The gear ring II of the first-stage 2K planetary gear reducer assembly is mounted on the housing. The first and second-stage 2K planetary gear reducer assemblies are connected in series. The gear ring I of the second-stage 2K planetary gear reducer assembly meshes with the gear of the ball-type non-return assembly. The planet carrier I of the second-stage 2K planetary gear reducer assembly meshes with the input shaft of the torque limiter assembly. The output teeth of the torque limiter assembly's output housing are matched with the teeth of the high-speed gear of the second-stage reducer assembly. The low-speed gear of the second-stage reducer assembly is connected to the ball nut of the ball screw assembly via a flat key. The ball nut is mounted on the housing. The end of the screw is connected to the output component to drive the ramp tailgate opening / closing function.

[0006] Furthermore, the two-stage reducer assembly includes: a low-speed stage gear, an intermediate stage gear shaft, and a high-speed stage gear shaft; The low-speed gear is connected to the ball nut by two flat keys; the intermediate gear shaft is supported on the housing by a deep groove ball bearing; the intermediate gear is connected to the intermediate gear shaft by a flat key; the high-speed gear shaft is fixed on the housing by a deep groove ball bearing; the low-speed gear and the intermediate gear shaft mesh, and the intermediate gear shaft and the high-speed gear shaft fit together.

[0007] Furthermore, the first-stage 2K planetary gear reducer assembly includes: gear ring II, planet carrier II, input shaft, and fixed housing; The first-stage 2K planetary gear reducer assembly includes planet carrier I, gear ring I, and planet gears; The planetary carrier I is connected to the torque limiter mechanism and is supported on the housing by a deep groove ball bearing. The gear ring I is supported on the housing by a fixed ring. The planetary gears on the planetary carrier II mesh with the external teeth of the input shaft and the internal teeth of the gear ring II. The input shaft is supported on the fixed housing and the planetary carrier II by a deep groove ball bearing. The fixed housing is installed inside the gear ring II by a sealing ring. The planetary gears of the planetary carrier I mesh with the external teeth of the planetary carrier II and the internal teeth of the gear ring I.

[0008] Furthermore, the steel ball type non-return assembly includes end cap I, gear, spline sleeve, friction damper, spring, ball track disc, manual input shaft, manual output shaft, end cap II, and housing; the friction damper includes a friction pair composed of friction plate I, static friction plate I, static friction plate II, moving friction plate II, and moving friction plate III; One end of the outer casing is fixedly connected to end cover I. The gear is connected to the manual output shaft via a flat key and inserted into the outer casing, with part of the gear protruding from the casing. The manual input shaft has a stepped shaft structure. The head end of the manual output shaft is supported on end cover I via a deep groove ball bearing. The tail end is also supported inside the large end of the manual input shaft via a deep groove ball bearing. The outer step of the manual output shaft is also supported on end cover II via a deep groove ball bearing. End cover II is connected to the other end of the outer casing. The outer surface of the spline sleeve is fixed to the outer casing. The inner cylindrical surface is connected to the static friction plates I and II via splines. The moving friction plate I is connected to the manual output shaft via splines. The moving friction plates II and III are connected to the output end of the ball track assembly via splines. The output end of the ball track assembly and the moving friction plate III are provided with an initial friction torque by a spring. The input end of the ball track assembly is connected to the manual output shaft via a spline. The ball track assembly is mounted on the flange at the tail end of the manual output shaft, and the ball track assembly is located inside the large end of the manual input shaft.

[0009] Furthermore, the friction damper includes: a spline sleeve, a small round nut, a stop washer, a gasket, a disc spring, and a friction pair; The small round nut presses the disc spring against the friction pair through the locking washer and the washer. There are gaps between the friction pair and the disc spring and the manual output shaft. The small round nut is locked onto the manual output shaft.

[0010] Furthermore, the fairway disc assembly includes an output fairway disc as the output end, a steel ball, and an input fairway disc as the input end; The input ball track plate is attached to the flange at the end of the manual output shaft. The output ball track plate is set as a stepped cylindrical structure with a spring at the large end and the small end extending into the friction pair. The small end is connected to the moving friction plate II and the moving friction plate III. Arc-shaped grooves are set at corresponding positions on the input and output ball track plates. The two arc-shaped grooves serve as the tracks for the rolling of the steel balls. Both the output and input ball track discs have protrusions on their outer circumferences, and sliding grooves corresponding to these two protrusions are arranged around the inner circumference of the larger end. This allows the output and input ball track discs to rotate to a certain extent after the pressure is reduced to a certain degree, so that the steel ball falls into the deepest part of the arc-shaped groove.

[0011] Furthermore, the torque limiter assembly includes: end cap III, torque limiting input shaft, buffer, and output housing; The torque limiting input shaft has its head end supported on end cover III by a deep groove ball bearing, and its middle part supported on the output housing by a deep groove ball bearing. The tail end of the torque limiting input shaft extends from the output housing and meshes with planetary carrier I. End cover III is fixedly connected to the output housing. The torque limiting input shaft is equipped with a flange, and the buffer is mounted on the flange. The buffer and the friction buffer have the same structure except for the friction pair. The moving friction plate of the friction pair of the buffer is splined connected to the output housing, and the stationary friction plate of the friction pair of the buffer is splined connected to the torque limiting input shaft. The friction pair of the buffer is initially in a compressed state.

[0012] Furthermore, the ball nuts of the ball screw assembly are supported inside the housing by tapered roller bearings and form a sealed area by lip seals.

[0013] Secondly, a method for constant-torque dual-mode linear drive in aviation is provided, which utilizes an aviation constant-torque dual-mode linear actuator. The method includes: In electric operating mode: The ramp tailgate lifting actuator receives the command signal from the cargo hold tailgate controller, and the motor outputs a certain speed and torque, which is transmitted to the torque limiter assembly through two 2K ​​planetary gear reducer assemblies. After being reduced by the secondary reducer assembly, it drives the ball screw assembly. Under the restriction of the raceway, the screw can only perform linear motion. The end of the screw is connected to the output component to drive the ramp tailgate opening / closing function. In manual operation mode: By inputting manual speed and torque into the ball-type non-returning component, the gear on the gear ring I integrated in the first-stage 2K planetary gear reducer component is driven. After being reduced by two 2K ​​planetary gear reducer components and the second-stage reducer component, the ball screw mechanism is driven. Under the constraint of the raceway, the screw can only perform linear motion. The end of the screw is connected to the output component to drive the ramp tailgate opening / closing function.

[0014] The beneficial effects of this invention are at least as follows: 1) The linear drive device in this application has both manual and electric modes. In manual mode, the hatch can be opened / closed directly by controlling the manual non-return mechanism with a hand drill. In electric mode, the hatch is opened / closed by controlling the motor. The linear drive device has the ability to be held at any position during the opening / closing process.

[0015] 2) The linear drive device of this application has a constant torque function, which can protect the linear drive device and the machine body structure from damage in the event of overload, motor stall, etc.

[0016] 3) The linear drive device of this application can realize the function of actuating large loads and the function of constant torque.

[0017] 4) The linear drive device of this application can achieve the function that the manual input terminal does not move in electric mode and the electric input terminal does not move in manual mode through the steel ball type non-return mechanism. Attached Figure Description

[0018] Figure 1 This is a simplified diagram of the locking device.

[0019] Figure 2 This is a structural cross-sectional view of a linear actuator according to an embodiment of the present invention.

[0020] Figure 3 This is an exploded view of a joint bearing assembly according to an embodiment of the present invention.

[0021] Figure 4 This is a structural cross-sectional view of a ball screw assembly according to an embodiment of the present invention.

[0022] Figure 5 This is a structural cross-sectional view of a two-stage gear reducer assembly according to an embodiment of the present invention.

[0023] Figure 6 This is a structural cross-sectional view of a torque limiter assembly according to an embodiment of the present invention.

[0024] Figure 7 This is a structural cross-sectional view of two 2K ​​planetary gear reducer assemblies according to an embodiment of the present invention.

[0025] Figure 8 This is a cross-sectional view of the steel ball-type non-returning component structure according to an embodiment of the present invention.

[0026] Figure 9 This is a schematic diagram illustrating the working principle according to an embodiment of the present invention. Detailed Implementation

[0027] The present application will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0028] This invention provides an aerospace constant torque dual-mode linear drive device, such as... Figure 1-8 As shown, it consists of a spherical bearing assembly 1, a ball screw assembly 2, a two-stage reducer assembly 3, a torque limiter assembly 4, two 2K ​​planetary gear reducer assemblies 5, a steel ball type non-return assembly 6, a motor 7, a housing 8, a sensor support 9, an O-ring, a cylindrical head screw with a safety hole at the head, and a washer.

[0029] The spherical bearing assembly 1 consists of a shaft elastic retaining ring 10 and a spherical bearing 11.

[0030] The ball screw assembly 2 consists of a ball screw assembly 12, a flat key 13, a tapered roller bearing 14, and a lip seal 15.

[0031] The secondary reducer assembly 3 consists of a low-speed gear 16, a bushing 17, an intermediate gear shaft 18, an intermediate gear 19, a high-speed gear shaft 20, a deep groove ball bearing 21, and a flat key 22.

[0032] The torque limiter assembly 4 consists of an end cap Ⅲ 23, a torque limiting input shaft 24, a small round nut 25, a stop washer 26, a disc spring 27, a static friction plate I 28, a dynamic friction plate 29, a static friction plate II 30, a deep groove ball bearing 31, a lip seal ring 32, an output housing 33, a cylindrical head screw with a safety hole at the head 34, and a washer 35.

[0033] The two 2K ​​planetary gear reducer assemblies 5 consist of a planet carrier I 36, a pin 37, a gear ring I 38, planetary gears 39, a gear ring II 40, a fixed housing 41, an input shaft 42, a deep groove ball bearing 43, a shaft elastic retaining ring 44, an O-ring seal 45, a retaining ring 46, a planet carrier II 47, a needle roller 48, and a baffle 49.

[0034] The steel ball type non-return assembly 6 consists of an end cap I50, a gear 51, a spline sleeve 52, a small round nut 53, a stop washer 54, a washer 55, a disc spring 56, a moving friction plate I57, a stationary friction plate I58, a stationary friction plate II 59, a moving friction plate II 60, a moving friction plate III 61, a spring 62, an output ball track plate 63, a steel ball 64, an input ball track plate 65, a manual input shaft 66, a manual output shaft 67, an end cap II 68, a deep groove ball bearing 69, a lip seal 70, an O-ring seal 71, a retaining ring for the hole 72, a housing 73, and a cylindrical head screw 74 with a safety hole in the head.

[0035] The spherical bearing assembly 1 is mounted on the housing 8 and fixed by the shaft elastic retaining ring 10; The ball screw assembly 2 is supported inside the housing 8 by tapered roller bearings and is connected to the low-speed gear 16 of the upper secondary gear reducer via a flat key 13. The low-speed gear 16 of the two-stage gear reducer assembly 2 is connected to the lower-stage ball nut via a flat key 13, and the high-speed gear shaft 20 is supported on the housing via a deep groove ball bearing 21 and connected to the upper-stage torque limiter. The output housing 33 of the torque limiter assembly 4 is connected to the lower-level two-stage gear reducer and is supported on the housing by a deep groove ball bearing 31. The input shaft 24 is connected to the upper-level 2K mechanism and is supported on the output housing 33 by a deep groove ball bearing.

[0036] The planet carrier I 36 of the two 2K ​​planetary gear reducer assemblies 5 is connected to the lower-level torque limiter mechanism and supported on the housing by a deep groove ball bearing 43. The gear ring I 38 is connected to the manual non-return mechanism and supported on the housing by a fixed ring 46. The planetary gears on the planet carrier II 47 mesh with the input shaft 42 and the gear ring II 40, and are connected to the upper-level motor through the input shaft. The input shaft 42 is supported on the fixed housing 41 and the planet carrier II 47 by a deep groove ball bearing 43.

[0037] The gear 51 of the steel ball type non-returning component 6 is connected to the upper-level 2K mechanism, and is connected to the manual output shaft 67 via a flat key. It is supported on the end cover I50 and the manual input shaft 66 via a deep groove ball bearing 69. The manual input shaft 66 is supported on the end cover II68 via a deep groove ball bearing and a lip seal ring. The end cover II68 is fixed to the housing.

[0038] The internal connection relationships of each component in the embodiment are as follows: The spherical bearing 11 of the spherical bearing assembly 1 is fixed to the housing by a shaft elastic retaining ring 10; The ball nut of the ball screw assembly 2 is supported inside the housing 8 by a tapered roller bearing and forms a sealed area by a lip seal ring. The low-speed gear 16 of the two-stage gear reducer assembly 2 is connected to the ball nut by two flat keys 13 and is limited by the bushing 17; the intermediate gear shaft 18 is supported on the housing by a deep groove ball bearing 21; the intermediate gear is connected to the intermediate gear shaft 18 by a flat key 22; and the high-speed gear shaft 20 is fixed on the housing by a deep groove ball bearing 21. The output housing 33 of the torque limiter assembly 4 is supported on the housing by a deep groove ball bearing 31, and the dynamic friction plate 29 is connected to the output housing 33 by a spline; the input shaft 24 is supported on the output housing 33 by a deep groove ball bearing, and the static friction plates I28 and II30 are connected to the input shaft 24 by a spline and locked by a small round nut 25, a stop washer 26, and a disc spring 27; the interior is formed by a lip seal and an O-ring seal to create a dry sealed environment.

[0039] The planet carrier I 36 of the two 2K ​​planetary gear reducer assemblies 5 is supported on the housing by a deep groove ball bearing 43. The planet carrier and the planet gears are connected by needle rollers, baffles, and pins. The gear ring I 38 is supported on the housing by a retaining ring 46. The planet gears on the planet carrier II 47 mesh with the input shaft 42 and the gear ring II 40, and are supported on the planet carrier I 36 by a deep groove ball bearing. The input shaft 42 is supported on the fixed housing 41 and the planet carrier II 47 by a deep groove ball bearing 43.

[0040] The gear 51 of the steel ball type non-returning component 6 is connected to the manual output shaft 67 via a flat key and supported on the end cover I50 and the manual input shaft 66 via a deep groove ball bearing 69; the manual input shaft 66 is supported on the end cover II 68 via a deep groove ball bearing and a lip seal; the end cover II 68 is fixed to the outer shell; the spline sleeve 52 is fixed to the outer shell and connected to the static friction plate I58 and static friction plate II 59 via splines; the moving friction plate I57 is connected to the manual output shaft 67 via splines; the moving friction plates II 60 and III 61 are connected to the output ball track plate 65 via splines; the output ball track plate and the moving friction plate III 61 are provided with initial friction torque by a spring 62; the input ball track plate is connected to the manual output shaft 67 via splines and is connected to the output ball track plate by steel balls; the interior of the component forms a dry sealed environment through the lip seal and the sealing ring.

[0041] The working principle of an aviation constant torque dual-mode linear actuator in this embodiment is as follows: Figure 9 As shown: In electric operating mode: The ramp tailgate lifting actuator receives the command signal from the cargo hold tailgate controller, and the motor outputs a certain speed and torque, which is transmitted to the torque limiter assembly through two 2K ​​planetary gear reducer assemblies. After being reduced by the secondary reducer assembly, it drives the ball screw assembly. Under the restriction of the raceway, the screw can only perform linear motion. The end of the screw is connected to the output component to drive the ramp tailgate opening / closing function. In manual operation mode: By inputting manual speed and torque into the ball-type non-returning component, the gear on the gear ring I integrated in the first-stage 2K planetary gear reducer component is driven. After being reduced by two 2K ​​planetary gear reducer components and the second-stage reducer component, the ball screw mechanism is driven. Under the constraint of the raceway, the screw can only perform linear motion. The end of the screw is connected to the output component to drive the ramp tailgate opening / closing function.

[0042] The above description merely illustrates the embodiments of this application, and while it is quite specific and detailed, it should not be construed as limiting the scope of the patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Furthermore, any parts not detailed in this application are conventional techniques.

Claims

1. An aerospace constant torque dual-mode linear drive device, characterized in that, include: Ball screw assembly, two-stage reducer assembly, torque limiter assembly, two 2K ​​planetary gear reducer assemblies, steel ball type non-return assembly, motor, housing; Among them, the motor is connected to the input shaft of the first-stage 2K planetary gear reducer assembly, the gear ring II of the first-stage 2K planetary gear reducer assembly is mounted on the housing, the first and second-stage 2K planetary gear reducer assemblies are connected in series, and the gear ring I of the second-stage 2K planetary gear reducer assembly meshes with the gear of the steel ball type non-return assembly. The planet carrier I of the second-stage 2K planetary gear reducer assembly meshes with the input shaft of the torque limiter assembly. The output teeth of the output housing of the torque limiter assembly are matched with the teeth of the high-speed gear of the second-stage reducer assembly. The low-speed gear of the second-stage reducer assembly is connected to the ball nut of the ball screw assembly via a flat key. The ball nut is mounted on the housing. The end of the screw is connected to the output component to drive the ramp tailgate opening / closing function.

2. The apparatus according to claim 1, characterized in that, The two-stage reducer assembly includes: a low-speed stage gear, an intermediate stage gear shaft, and a high-speed stage gear shaft; The low-speed gear is connected to the ball nut by two flat keys; the intermediate gear shaft is supported on the housing by a deep groove ball bearing; the intermediate gear is connected to the intermediate gear shaft by a flat key; the high-speed gear shaft is fixed on the housing by a deep groove ball bearing; the low-speed gear and the intermediate gear shaft mesh, and the intermediate gear shaft and the high-speed gear shaft fit together.

3. The apparatus according to claim 2, characterized in that, The first-stage 2K planetary gear reducer assembly includes: gear ring II, planet carrier II, input shaft, and fixed housing; The first-stage 2K planetary gear reducer assembly includes planet carrier I, gear ring I, and planet gears; The planetary carrier I is connected to the torque limiter mechanism and is supported on the housing by a deep groove ball bearing. The gear ring I is supported on the housing by a fixed ring. The planetary gears on the planetary carrier II mesh with the external teeth of the input shaft and the internal teeth of the gear ring II. The input shaft is supported on the fixed housing and the planetary carrier II by a deep groove ball bearing. The fixed housing is installed inside the gear ring II by a sealing ring. The planetary gears of the planetary carrier I mesh with the external teeth of the planetary carrier II and the internal teeth of the gear ring I.

4. The apparatus according to claim 3, characterized in that, The steel ball type non-return assembly includes end cap I, gear, spline sleeve, friction damper, spring, ball track disc, manual input shaft, manual output shaft, end cap II, and housing; the friction damper includes a friction pair composed of friction plate I, stationary friction plate I, stationary friction plate II, moving friction plate II, and moving friction plate III; One end of the outer casing is fixedly connected to end cover I. The gear is connected to the manual output shaft via a flat key and inserted into the outer casing, with part of the gear protruding from the casing. The manual input shaft has a stepped shaft structure. The head end of the manual output shaft is supported on end cover I via a deep groove ball bearing. The tail end is also supported inside the large end of the manual input shaft via a deep groove ball bearing. The outer step of the manual output shaft is also supported on end cover II via a deep groove ball bearing. End cover II is connected to the other end of the outer casing. The outer surface of the spline sleeve is fixed to the outer casing. The inner cylindrical surface is connected to the static friction plates I and II via splines. The moving friction plate I is connected to the manual output shaft via splines. The moving friction plates II and III are connected to the output end of the ball track assembly via splines. The output end of the ball track assembly and the moving friction plate III are provided with an initial friction torque by a spring. The input end of the ball track assembly is connected to the manual output shaft via a spline. The ball track assembly is mounted on the flange at the tail end of the manual output shaft, and the ball track assembly is located inside the large end of the manual input shaft.

5. The apparatus according to claim 4, characterized in that, The friction damper includes: spline sleeve, small round nut, stop washer, gasket, disc spring, and friction pair; The small round nut presses the disc spring against the friction pair through the locking washer and the washer. There are gaps between the friction pair and the disc spring and the manual output shaft. The small round nut is locked onto the manual output shaft.

6. The apparatus according to claim 5, characterized in that, The fairway disc assembly includes an output fairway disc as the output end, a steel ball, and an input fairway disc as the input end; The input ball track plate is attached to the flange at the end of the manual output shaft. The output ball track plate is set as a stepped cylindrical structure with a spring at the large end and the small end extending into the friction pair. The small end is connected to the moving friction plate II and the moving friction plate III. Arc-shaped grooves are set at corresponding positions on the input and output ball track plates. The two arc-shaped grooves serve as the tracks for the rolling of the steel balls. Both the output and input ball track discs have protrusions on their outer circumferences, and sliding grooves corresponding to these two protrusions are arranged around the inner circumference of the larger end. This allows the output and input ball track discs to rotate to a certain extent after the pressure is reduced to a certain degree, so that the steel ball falls into the deepest part of the arc-shaped groove.

7. The apparatus according to claim 6, characterized in that, The torque limiter assembly includes: end cap III, torque limiting input shaft, buffer, and output housing; The torque limiting input shaft has its head end supported on end cover III by a deep groove ball bearing, and its middle part supported on the output housing by a deep groove ball bearing. The tail end of the torque limiting input shaft extends from the output housing and meshes with planetary carrier I. End cover III is fixedly connected to the output housing. The torque limiting input shaft is equipped with a flange, and the buffer is mounted on the flange. The buffer and the friction buffer have the same structure except for the friction pair. The moving friction plate of the friction pair of the buffer is splined connected to the output housing, and the stationary friction plate of the friction pair of the buffer is splined connected to the torque limiting input shaft. The friction pair of the buffer is initially in a compressed state.

8. The apparatus according to claim 7, characterized in that, The ball nuts of the ball screw assembly are supported inside the housing by tapered roller bearings and form a sealed area by lip seals.

9. A constant-torque dual-mode linear drive method for aircraft, using the constant-torque dual-mode linear actuator of claim 1, characterized in that, The method includes: In electric operating mode: The ramp tailgate lifting actuator receives the command signal from the cargo hold tailgate controller, and the motor outputs a certain speed and torque, which is transmitted to the torque limiter assembly through two 2K ​​planetary gear reducer assemblies. After being reduced by the secondary reducer assembly, it drives the ball screw assembly. Under the restriction of the raceway, the screw can only perform linear motion. The end of the screw is connected to the output component to drive the ramp tailgate opening / closing function. In manual operation mode: By inputting manual speed and torque into the ball-type non-returning component, the gear on the gear ring I integrated in the first-stage 2K planetary gear reducer component is driven. After being reduced by two 2K ​​planetary gear reducer components and the second-stage reducer component, the ball screw mechanism is driven. Under the constraint of the raceway, the screw can only perform linear motion. The end of the screw is connected to the output component to drive the ramp tailgate opening / closing function.

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