Coupling driving mechanism of electric tail gate

Abstract

The invention discloses an electric tail gate coupling driving mechanism which comprises a motor, a speed reduction structure, a damping structure, a bearing and a lead screw assembly, and further comprises a coupling shell and a coupling element arranged in the coupling shell, one end of the coupling shell is connected with a shell body of the motor, and the other end of the coupling shell is connected with the motor. The speed reduction structure and the damping structure share the same coupling shell, a rotating shaft of the motor is connected with the coupling element through the speed reduction structure, the coupling element is connected with one end of the lead screw, and the damping structure is arranged between the coupling element and the coupling shell. The electric tail gate coupling driving mechanism is reasonable in structural design, a speed reduction structure and a damping structure are coupled into an integral structure, the number and cost of parts are reduced, the reduction gearbox and the damper share the shell, assembling is convenient, and the coaxiality of the parts can be guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of electric tailgate support rods, and in particular to an electric tailgate coupling drive mechanism. Background Art

[0002] In order to meet the need for people to open and close the car door normally without touching it, many remote control or induction control electric door opening and closing systems have emerged in the current market. The most critical mechanical component of the electric door opening and closing system is the electric strut, and the key components in the electric strut are the reduction gearbox and the damper.

[0003] As Figure 3 shown, the existing electric strut drive components mass-produced in the automotive industry mainly include a motor 1, a reduction structure 2, a damping structure 3, a bearing 4, and a lead screw assembly 5; its working principle is that the motor 1 generates a driving torque, the motor 1 is connected to the reduction structure 2 to increase the driving torque, the bearing 4 and the lead screw assembly 5 convert the driving torque into an axial movement to drive the telescopic movement of the electric strut, and the damping structure 3 is connected to the lead screw assembly 5 to ensure the hovering of the electric tailgate system; among them, the reduction and damping structures are separate components. As disclosed in a vehicle electric tailgate drive mechanism disclosed in Chinese Patent CN209375364U and an electric tailgate strut for a vehicle and a vehicle disclosed in CN215889740U, the reduction gearbox and the damper are both separate components; the disadvantages of the existing separate component reduction gearbox and damper structures are that there are many parts, which affect the coaxiality of assembly and the cost is high. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides an electric tailgate coupling drive mechanism to achieve the purpose of fewer parts and lower cost.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0006] The electric tailgate coupling drive mechanism includes a motor, a reduction structure, a damping structure, a bearing, and a lead screw assembly. The bearing is provided corresponding to the lead screw of the lead screw assembly. It further includes a coupling housing and a coupling element provided in the coupling housing. One end of the coupling housing is connected to the housing of the motor. The reduction structure and the damping structure share the same coupling housing. The rotating shaft of the motor is connected to the coupling element through the reduction structure. The coupling element is connected to one end of the lead screw. The damping structure is provided between the coupling element and the coupling housing.

[0007] Furthermore:

[0008] The reduction structure is a planetary gear structure. One end of the coupling element is a planet carrier. Planet gears are provided on the planet carrier. A tooth ring structure meshing with the planet gears is provided on the inner edge of the coupling housing. The other end of the coupling element is connected to the lead screw spline structure.

[0009] It further includes a main body pipe, the motor and the coupling housing are both arranged inside the main body pipe, a bearing seat is provided corresponding to the bearing, and the bearing seat and the main body pipe are connected by riveting or welding.

[0010] The damping structure includes an elastic element, a rotation stopping element, a friction element and a rotating element. One end of the coupling element is provided with an outer flange, and the other end of the coupling housing is provided with an inner flange. The elastic element, the rotation stopping element, the friction element and the rotating element are sequentially arranged between the outer flange and the inner flange.

[0011] The planetary gear structure is a two-stage planetary gear train structure. An intermediate planetary carrier is provided between the motor and the planetary carrier of the coupling element. A motor gear is provided on the rotating shaft of the motor, and an intermediate planetary gear meshing with the motor gear is provided on the intermediate planetary carrier. The ring gear structure of the coupling housing is arranged in two parts side by side.

[0012] A buffer element is provided between the coupling housing and the bearing seat.

[0013] A chute is axially arranged on the inner edge of the coupling housing, a rotation stopping protrusion matching with the chute is provided on the outer edge of the rotation stopping element, and the rotating element and the coupling element are matched through a spline structure.

[0014] The other end of the coupling element extends out from the inner flange of the coupling housing, an end groove is provided on the extending part of the coupling element, and an elastic retaining ring is provided at the end groove.

[0015] The buffer element is a concave-convex structure element, and clamping grooves are provided on both sides of the concave-convex structure element. One side of the clamping groove is clamped on the end of the coupling housing, and the other side of the clamping groove is clamped on the bearing seat.

[0016] The end of the chute of the coupling housing is clamped on the edge of the outer flange of the coupling element.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] The structure of the electric tailgate coupling drive mechanism is reasonably designed, the reduction structure and the damping structure are coupled into an integral structure, the number of parts and the cost are saved, the reduction gearbox and the damper share the housing, the assembly is convenient, and the coaxiality of the parts can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following briefly describes the content expressed by each drawing in this specification and the marks in the drawings:

[0020] Figure 1 It is a schematic structural diagram of the coupling drive mechanism of the present invention.

[0021] Figure 2 It is a schematic structural diagram of the coupling element of the present invention.

[0022] Figure 3It is a schematic diagram of the existing electric strut structure.

[0023] In the figure:

[0024] 1. Motor, 2. Reduction structure, 3. Damping structure, 4. Bearing, 5. Lead screw assembly, 6. Coupling housing, 7. Coupling element, 8. Elastic element, 9. Anti-rotation element, 10. Friction element, 11. Rotating element, 12. Gasket, 13. Snap ring, 14. Buffer element, 15. Bearing housing Ⅰ, 16. Bearing housing Ⅱ, 17. Main body tube. Specific embodiments

[0025] The following will further describe the specific embodiments of the present invention in detail by describing the embodiments with reference to the accompanying drawings.

[0026] As Figure 1 and Figure 2 shown, the electric tailgate coupling drive mechanism includes a main body tube 17, a motor 1, a reduction structure 2, a damping structure 3, a bearing 4, a lead screw assembly 5, a coupling housing 6, and a coupling element 7 provided in the coupling housing; the bearing is arranged corresponding to the lead screw of the lead screw assembly to support the rotation of the lead screw. One end of the coupling housing is connected to the end of the motor housing through a fastener. The reduction structure and the damping structure share the same coupling housing. The rotating shaft of the motor is connected to the coupling element through the reduction structure. The coupling element is connected to one end of the lead screw, and the damping structure is arranged between the coupling element and the coupling housing.

[0027] The present invention couples the reduction structure and the damping structure into an integral structure, saving the number of parts and cost. The reduction gearbox and the damper share the housing, which is convenient for assembly and can ensure the coaxiality of the parts.

[0028] Both the motor and the coupling housing are arranged in the main body tube 17. Bearing seats are provided corresponding to the bearings, and the bearing seats are also arranged in the main body tube. The bearing seats and the main body tube are connected by riveting or welding, and the structure is stable and reliable.

[0029] The reduction structure is a planetary gear structure. One end of the coupling element is a planet carrier, and planetary gears are provided on the planet carrier. A tooth ring structure meshing with the planetary gears is provided on the inner edge of the coupling housing. The other end of the coupling element is a hollow structure, and the end of the lead screw is located in the hollow structure and is connected through an internal and external spline structure.

[0030] Furthermore, the planetary gear structure is a two-stage planetary gear train structure. An intermediate planet carrier is provided between the motor and the planet carrier of the coupling element. A motor gear is provided on the rotating shaft of the motor. Intermediate planetary gears meshing with the motor gear are provided on the intermediate planet carrier. The tooth ring structure of the coupling housing is arranged in two parts side by side. One part of the tooth ring meshes with the intermediate planetary gears, and the other part of the tooth ring meshes with the planetary gears on the planet carrier of the coupling element. It is integrally arranged through the same coupling housing, with a compact structure and good coaxiality of the parts.

[0031] The damping structure includes an elastic element 8, a rotation prevention element 9, a friction element 10, and a rotating element 11. One end of the coupling element is provided with an outer flange, and the other end of the coupling housing is provided with an inner flange. The elastic element, the rotation prevention element, the friction element, and the rotating element are sequentially arranged between the outer flange and the inner flange.

[0032] The end of the chute of the coupling housing is stuck on the edge of the outer flange of the coupling element; a chute is axially provided on the inner edge of the coupling housing, and a rotation prevention protrusion that cooperates with the chute is provided on the outer edge of the rotation prevention element. The rotation prevention element is axially movable, and the rotating element is in spline structure cooperation with the coupling element; the elastic element presses the rotation prevention element, the friction element, and the rotating element to generate a friction torque.

[0033] The other end of the coupling element 7 extends out of the inner flange of the coupling housing. An end groove is provided on the extended part of the coupling element, and a snap ring 13 is provided at the end groove. The installation length of the elastic element is limited by the cooperation of the end groove of the coupling element and the snap ring.

[0034] A buffer element 14 is provided between the coupling housing and the bearing seat. Vibration and noise are reduced through the buffer element; further, the buffer element is a concave-convex structure element. Card slots are provided on both sides of the concave-convex structure element. One side of the card slot is stuck on the end of the coupling housing, and the other side of the card slot is stuck on the bearing seat, and the structure is stable and reliable.

[0035] A preferred specific example of the present invention is:

[0036] The electric tailgate coupling drive mechanism includes a motor 1, a coupling housing 6, a coupling element 7, an elastic element 8, a rotation prevention element 9, a friction element 10, a rotating element 11, a gasket 12, a snap ring 13, a buffer element 14, a bearing seat I 15, a bearing seat II 16, a bearing 4, and a lead screw assembly 5.

[0037] The motor gear of the motor 1 is in meshing transmission with a two-stage planetary gear train to drive torque. A ring gear structure that meshes with the planetary gear is provided on the inner edge of the coupling housing, and the coupling element outputs driving torque.

[0038] The external spline 7-1 of the coupling element 7 cooperates with the internal spline of the rotating element 11, and the end groove 7-2 of the external spline of the coupling element 7 cooperates with the snap ring 13 to limit the installation length of the elastic element 8, so that the elastic element 8 presses the rotation prevention element 9, the friction element 10, and the rotating element 11 to generate a friction torque.

[0039] The internal spline 7-3 of the coupling element 7 cooperates with the external spline at the end of the lead screw of the lead screw assembly 5. A sliding nut sleeve is provided on the lead screw, so that the output torque is converted into an axial force to drive the electric strut to expand and contract. The lead screw assembly is a component in which a lead screw and a nut cooperate. The driving torque output by the coupling element rotates the lead screw, thereby driving the nut to perform an axial linear motion.

[0040] Buffer element 14 is installed between coupling housing 6 and bearing seat I 15 to reduce vibration and noise. Elastic element 8 also acts as a buffer during small axial movements of coupling element 7, allowing the coupling element to rotate smoothly. A small gap exists between it and the mating part, which is eliminated by the elastic element.

[0041] The bearing 4 is clamped between the bearing seat I15 and the bearing seat II16. The outer cylindrical surfaces of the bearing seat I15 and the bearing seat II16 are respectively provided with riveted grooves for axial positioning of the bearing 4. The bearing plays a key supporting role. The bearing is limited by riveting, and can also be achieved by laser welding or other methods.

[0042] The motor gear of the motor 1 is meshed with the two-stage planetary gear system to transmit the driving torque, and the coupling element outputs the transmission torque. The inner hole of the coupling housing 6 has two-stage internal gears, which are injection molded into an integrated structure. The gear parameters of the two-stage internal gears can be consistent, or they can be as follows. Figure 1 There is a groove for installing the anti-rotation element 9 behind the two-stage internal gear in the inner hole of the coupling housing 6. The end of this groove contacts and cooperates with the edge of the coupling element to limit the coupling element.

[0043] The coupling housing 6, coupling element 7 and elastic retaining ring 13 limit the installation length of the elastic element 8, making it impossible for the elastic element 8 to adjust the compression force, because the installation length limitation of the elastic element allows the two-stage planetary gear train to have sufficient axial movement space.

[0044] This patented structure is compact and has a smaller overall size, making it compatible with more electric tailgate systems. The reduction gearbox and damper are coupled into one, saving the number of parts and costs. The reduction gearbox and damper share a common housing, which can ensure the coaxiality of the parts.

[0045] The above is only an illustration of a preferred embodiment of the present invention. The above technical features can be arbitrarily combined to form multiple embodiments of the present invention.

[0046] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. An electric tailgate coupling drive mechanism, comprising a motor, a reduction mechanism, a damping mechanism, a bearing, and a screw assembly, wherein the bearing corresponds to the screw of the screw assembly, and is characterized in that: It further includes a coupling housing and a coupling element disposed within the coupling housing. One end of the coupling housing is connected to the housing of the motor. The reduction structure and the damping structure share the same coupling housing. The rotating shaft of the motor is connected to the coupling element through the reduction structure. The coupling element is connected to one end of the lead screw. The damping structure is disposed between the coupling element and the coupling housing.

2. The electric tailgate coupling drive mechanism according to claim 1, characterized in that: The reduction structure is a planetary gear structure. One end of the coupling element is a planet carrier. Planet gears are provided on the planet carrier. A ring gear structure meshing with the planet gears is provided on the inner edge of the coupling housing. The other end of the coupling element is connected to the spline structure of the lead screw.

3. The electric tailgate coupling drive mechanism according to claim 1, wherein: It further includes a main body tube. The motor and the coupling housing are both disposed within the main body tube. A bearing seat is provided corresponding to the bearing. The bearing seat and the main body tube are connected by riveting or welding.

4. The electric tailgate coupling drive mechanism according to claim 1, wherein: The damping structure includes an elastic element, a rotation stopping element, a friction element, and a rotating element. An outer flange is provided at one end of the coupling element. An inner flange is provided at the other end of the coupling housing. The elastic element, the rotation stopping element, the friction element, and the rotating element are sequentially disposed between the outer flange and the inner flange.

5. The electric tailgate coupling drive mechanism according to claim 2, characterized in that: The planetary gear structure is a two-stage planetary gear train structure. An intermediate planet carrier is provided between the motor and the planet carrier of the coupling element. A motor gear is provided on the rotating shaft of the motor. Intermediate planet gears meshing with the motor gear are provided on the intermediate planet carrier. The ring gear structure of the coupling housing is composed of two parts arranged side by side.

6. The electric tailgate coupling drive mechanism according to claim 3, wherein: A buffer element is provided between the coupling housing and the bearing seat.

7. The electric tailgate coupling drive mechanism according to claim 4, wherein: A chute is axially provided on the inner edge of the coupling housing. A rotation stopping protrusion cooperating with the chute is provided on the outer edge of the rotation stopping element. The rotating element and the coupling element are in spline structure cooperation.

8. The electric tailgate coupling drive mechanism according to claim 4, characterized in that: The other end of the coupling element extends out from the inner flange of the coupling housing. An end groove is provided on the extending part of the coupling element. An elastic retaining ring is provided at the end groove.

9. The electric tailgate coupling drive mechanism according to claim 6, wherein: The buffer element is a concave-convex structure element. Card slots are provided on both sides of the concave-convex structure element. The card slot on one side is stuck on the end of the coupling housing, and the card slot on the other side is stuck on the bearing seat.

10. The electric tailgate coupling drive mechanism according to claim 7, characterized in that: The end of the chute of the coupling housing is stuck on the edge of the outer flange of the coupling element.

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