Automobile electric tail gate stay rod

Abstract

The utility model discloses an automobile electric tail door stay rod, include: stay rod main part and stay rod vice body, stay rod main part includes outer sleeve tube, drive motor and screw rod, be provided with bearing mechanism between screw rod and outer sleeve tube, and bearing mechanism has a cavity, stay rod vice body includes moving assembly and damper subassembly, and moving assembly is with screw rod thread cooperation, and damper subassembly installs in the cavity. Automobile electric tail door stay rod provided in the application, through setting up a cavity in bearing mechanism, and damper subassembly is directly integrated and installed in the cavity, makes full use of the structure clearance that originally exists in screw rod end area, inlays damper function module in bearing mechanism inside, significantly reduces the axial dimension of electric tail door stay rod whole, is favorable in limited installation space realizes more compact layout. Meanwhile, damper subassembly is coaxial with screw rod and sets up, can more directly, stably provide rotary damping force, promotes the stability and control accuracy of tail door opening and closing process.

Description

Technical Field

[0001] This utility model relates to the field of automobile tailgate adjustment technology, and in particular to an electric tailgate support rod for automobiles. Background Technology

[0002] An electric tailgate strut is a drive device used to automatically open and close the tailgate of a vehicle, widely used in modern automobiles. Its basic principle is that the ECU (Electronic Control Unit) controls the forward and reverse rotation of a geared motor, driving the lead screw to rotate, which in turn causes the nut assembly to move linearly, thus extending or retracting the strut, thereby pushing or pulling the tailgate back. In existing technology, electric struts typically include components such as an outer sleeve, inner sleeve, lead screw, nut assembly, spring, and guide tube. The damper assembly is used to provide a self-locking force to prevent the tailgate from accidentally falling when the spring force is insufficient.

[0003] However, the dampers in existing electric tailgate struts are mostly installed as independent assembly components, occupying a large axial space. In situations where vehicle installation space is limited, it is difficult to achieve a compact layout, which affects the flexibility of matching with different vehicle models. Summary of the Invention

[0004] This application provides an electric tailgate strut for automobiles, which solves the technical problem that the damper in the existing electric tailgate strut is installed as an independent component, occupying a large axial space.

[0005] This application provides a support rod for an electric tailgate of an automobile, including: The support rod body includes an outer tube, a drive motor, and a lead screw. The drive motor is installed at the bottom of the outer tube, and the output shaft of the drive motor is connected to the lead screw. A bearing mechanism is provided between the lead screw and the outer tube, and the bearing mechanism has a cavity. The strut assembly includes a moving component and a damper assembly. The moving component is threadedly engaged with the lead screw. The damper assembly is installed in the cavity and is used to provide damping force for the rotation of the lead screw. The bearing mechanism and the damper assembly are located at the end of the lead screw.

[0006] In some embodiments, the bearing mechanism includes a bearing housing and a bearing, the bearing housing being mounted in the outer sleeve, the bearing being mounted at one end of the bearing housing, and the cavity being disposed at the end of the bearing housing away from the bearing.

[0007] In some embodiments, the damper assembly includes a static friction plate, a dynamic friction plate, a damping spring, and a spring cap. The static friction plate is disposed in the bearing housing via a spline engagement. The dynamic friction plate is engaged with the lead screw via a spline engagement. The spring cap is detachably mounted in the bearing housing. The damping spring is disposed between the spring cap and the static friction plate, and the spring force of the damping spring acts on the static friction plate and the dynamic friction plate.

[0008] In some embodiments, there are multiple dynamic friction plates and static friction plates, and each side of the dynamic friction plate is provided with a corresponding static friction plate.

[0009] In some embodiments, the dynamic friction pad is made of high-strength plastic, and the static friction pad is made of metal.

[0010] In some embodiments, the moving component includes an inner sleeve and a support spring, the support spring being disposed inside the inner sleeve and sleeved outside the lead screw, one end of the support spring abutting against the end of the inner sleeve, and the other end of the support spring abutting against the spring cap.

[0011] In some embodiments, the strut assembly further includes a guide tube, the end of which is fixedly connected to a spring cap, and the support spring is sleeved on the outside of the guide tube.

[0012] In some embodiments, the lead screw passes through the spring cover, a waterproof ring is provided between the inner wall of the spring cover and the lead screw, and a waterproof ring is provided between the bearing seat and the outer sleeve.

[0013] In some embodiments, the movable component includes a nut and a reinforcing tube, the nut being threaded into a lead screw, one end of the reinforcing tube being fixedly connected to the nut, and the other end of the reinforcing tube being fixedly connected to the end of the inner sleeve.

[0014] In some embodiments, both the end of the outer sleeve and the end of the inner sleeve are fixedly provided with ball sockets.

[0015] The beneficial effects of this application are as follows: The electric tailgate strut provided in this application utilizes the existing structural gaps in the lead screw end area by incorporating a cavity within the bearing mechanism and directly integrating the damper assembly into this cavity. This embeds the damping module within the bearing mechanism, significantly reducing the overall axial dimension of the electric tailgate strut and facilitating a more compact layout within limited installation space. Furthermore, the coaxial arrangement of the damper assembly and lead screw provides a more direct and stable rotational damping force, improving the smoothness and control precision of the tailgate opening and closing process. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model.

[0017] Figure 1 A schematic diagram of the overall structure of an electric tailgate strut for automobiles provided in this application; Figure 2 A cross-sectional view of an electric tailgate strut for automobiles provided in this application; Figure 3 One of the partial sectional views of an electric tailgate strut for automobiles provided in this application; Figure 4 This is a second partial sectional view of an electric tailgate strut for automobiles provided in this application.

[0018] Among them, 100 is the main body of the strut; 110 is the outer sleeve; 120 is the drive motor; 130 is the lead screw; 140 is the bearing mechanism; 141 is the cavity; 142 is the bearing seat; and 143 is the bearing. 200. Support strut assembly; 210. Moving component; 211. Inner sleeve; 212. Support spring; 213. Nut; 214. Reinforcing tube; 220. Damper assembly; 221. Static friction plate; 222. Dynamic friction plate; 223. Damping spring; 224. Spring cap; 230. Guide tube; 240. Ball socket. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0020] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0021] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0022] This application provides an electric tailgate strut, which solves the technical problem in the prior art where the damper in the electric tailgate strut is installed as an independent component, occupying a large axial space.

[0023] The technical solution in this application is to solve the above-mentioned technical problems, and the general idea is as follows: like Figures 1-4 As shown, this application provides an electric tailgate strut for automobiles, including: a strut body 100 and a strut sub-body 200. The strut body 100 includes an outer sleeve 110, a drive motor 120, and a lead screw 130. The drive motor 120 is installed at the bottom of the outer sleeve 110 and can be fixed by screws or clips. The output shaft of the drive motor 120 is connected to the lead screw 130. A bearing 143 mechanism 140 is provided between the lead screw 130 and the outer sleeve 110. The bearing 143 mechanism 140 has a cavity 141. The outer sleeve 110 is made of metal tubing or high-strength engineering plastic tubing to balance structural strength and lightweight requirements. The strut sub-body 200 includes a moving component 210 and a damper. Component 220, the movable component 210 is threadedly engaged with the lead screw 130 to form a ball screw pair or a conventional threaded pair, used to convert the rotational motion of the lead screw 130 into linear telescopic motion. The damper component 220 is installed in the cavity 141. Since the force supporting the tailgate mainly comes from the support spring, but the support spring itself and the installation space are limited, the elastic force of the support spring cannot be very large to support a relatively heavy tailgate. Therefore, the damper component 220 provides damping force to the rotation of the lead screw 130 to achieve smooth control of the tailgate opening and closing process and the support capacity of the support rod after power failure. The bearing 143 mechanism 140 and the damper component 220 are located at the end position of the lead screw 130.

[0024] By providing a cavity 141 within the bearing 143 mechanism 140 and directly integrating the damper assembly 220 into this cavity 141, the original structural gap in the end region of the lead screw 130 is fully utilized. The damping module is embedded within the bearing 143 mechanism 140, significantly reducing the overall axial dimension of the electric tailgate support rod, which facilitates a more compact layout within limited installation space. Simultaneously, the damper assembly 220 is coaxially arranged with the lead screw 130, providing more direct and stable rotational damping force, thus improving the smoothness and control precision of the tailgate opening and closing process.

[0025] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0026] Preferably, the bearing 143 mechanism 140 includes a bearing 143 seat 142 and a bearing 143. The bearing 143 seat 142 is installed in the outer sleeve 110. The bearing 143 seat 142 can be made of metal or high-strength engineering plastic. The bearing 143 is installed at the end of the bearing 143 seat 142. The cavity 141 is located at the end of the bearing 143 seat 142 away from the bearing 143. The lead screw 130 is connected to the output shaft of the drive motor 120 through a coupling. The coupling can be a rigid coupling, a flexible coupling, or a spline sleeve structure to adapt to different transmission accuracy and buffering requirements.

[0027] By integrating a cavity 141 inside the bearing 143 seat 142, the damper assembly 220 is embedded in the end area of ​​the lead screw 130, avoiding the problem of the damper occupying additional axial space as an independent assembly in the traditional solution, which significantly improves the overall compactness and vehicle adaptability of the strut. At the same time, the lead screw 130 is flexibly or rigidly connected to the motor output shaft via a coupling to ensure smooth and reliable power transmission. Combined with the controllable friction provided by the built-in damper, it effectively enhances the support capacity of the strut after the tailgate is opened and suspended or after power failure, improving safety and operating comfort.

[0028] Preferably, the damper assembly 220 includes a static friction plate 221, a dynamic friction plate 222, a damping spring 223, and a spring cover 224. The static friction plate 221 is splined in the bearing 143 seat 142. The dynamic friction plate 222 is splined with the lead screw 130 and rotates synchronously with the lead screw 130. The spring cover 224 is detachably installed in the bearing 143 seat 142. The damping spring 223 is disposed between the spring cover 224 and the static friction plate 221. The elastic force of the damping spring 223 acts on the static friction plate 221 and the dynamic friction plate 222. The damping spring 223 is a wave spring, disc spring, or compression coil spring to adjust the preload.

[0029] Specifically, there are multiple moving friction plates 222 and multiple stationary friction plates 221. Each side of the moving friction plate 222 is provided with a corresponding stationary friction plate 221. Preferably, there are two stationary friction plates 221 to form a clamping structure. The moving friction plate 222 is made of high-strength plastic, and the stationary friction plate 221 is made of metal.

[0030] The damper assembly 220 adopts a layout of multiple static friction plates 221 and dynamic friction plates 222. The number of static friction plates is always one more than the number of dynamic friction plates, and the two are alternately stacked to form a friction pair. The friction pair design, which combines high-strength plastic and metal materials, reduces wear and noise while ensuring reliable damping force. The positive pressure provided by the damping spring 223 generates stable frictional resistance between the dynamic and static friction plates 221, effectively suppressing the free rotation of the lead screw 130 in the unpowered state, thereby improving the tailgate's hovering stability and power-off self-locking capability. At the same time, the damper assembly 220 is integrated into the internal cavity 141 of the bearing 143 seat 142, without occupying additional axial space, which significantly improves the overall compactness, assembly efficiency, and adaptability to the tailgate weight of different vehicle models.

[0031] Preferably, the moving component 210 includes an inner sleeve 211 and a support spring 212. The support spring 212 is disposed inside the inner sleeve 211 and sleeved outside the lead screw 130. One end of the support spring 212 abuts against the end of the inner sleeve 211, and the other end of the support spring 212 abuts against the spring cap 224, forming a stable axial preload structure.

[0032] Furthermore, the strut assembly 200 also includes a guide tube 230, the end of which is fixedly connected to the spring cap 224. The connection between the guide tube 230 and the spring cap 224 can be an interference fit, a snap-fit ​​structure, a threaded connection, or a riveting, to ensure that the two maintain synchronous movement during the extension and retraction process. The support spring 212 is sleeved on the outside of the guide tube 230.

[0033] The inner sleeve 211 can be made of metal or high-strength engineering plastic, balancing strength and lightweight; the guide tube 230 is preferably made of aluminum alloy, and can be combined with a rubber coating process to improve surface wear resistance and running stability; the support spring 212 is a cylindrical helical compression spring.

[0034] By coaxially arranging the support spring 212 on the outside of the guide tube 230, and limiting both ends by the inner sleeve 211 and the spring cap 224 respectively, not only is the gravity load of the tailgate effectively transmitted, but the guide tube 230 is also used to achieve precise guidance of the spring, preventing it from buckling or deflecting during compression / extension. At the same time, the fixed connection between the guide tube 230 and the spring cap 224 makes the damper assembly 220, the support spring 212 and the moving assembly 210 form an integrated motion unit, which improves the system rigidity and operational stability.

[0035] Furthermore, the lead screw 130 passes through the spring cover 224, and a waterproof ring is provided between the inner wall of the spring cover 224 and the lead screw 130. A waterproof ring is also provided between the bearing 143 seat 142 and the outer sleeve 110. The waterproof ring can be made of rubber material, such as nitrile rubber (NBR), fluororubber (FKM), or silicone, which has good elasticity, aging resistance, and sealing performance. Its cross-sectional shape can be an O-ring, a Y-ring, or a lip seal, which can be adapted and replaced according to the sealing pressure and motion state to prevent environmental media from entering the bearing 143 mechanism 140 and motor area from the end of the outer sleeve 110. This effectively avoids problems such as motor corrosion, bearing 143 jamming, or electrical control failure caused by moisture intrusion, and extends the service life of the product.

[0036] Preferably, the moving component 210 includes a nut 213 and a reinforcing tube 214. The nut 213 is threaded into the lead screw 130. One end of the reinforcing tube 214 is fixedly connected to the nut 213, and the other end of the reinforcing tube 214 is fixedly connected to the end of the inner sleeve 211. The reinforcing tube 214 can be made of metal or high-strength engineering plastic to balance rigidity and lightweight requirements. The connection between the reinforcing tube 214 and the nut 213 can be welding, riveting, threaded connection, or interference fit. The connection between the reinforcing tube 214 and the end of the inner sleeve 211 can be using a snap fastener, screw fastening, bonding, or an integral molding structure.

[0037] By rigidly connecting the nut 213 to the inner sleeve 211 with the reinforcing tube 214, the problems of uneven load, deformation or loosening that may occur when the traditional single nut 213 is subjected to large loads are effectively avoided. At the same time, the reinforcing tube 214, as an intermediate load-bearing component, shares part of the axial and radial forces, improves the overall rigidity and bending resistance of the moving component 210, and ensures that the strut runs smoothly and without shaking during the extension and retraction process.

[0038] Preferably, both the end of the outer sleeve 110 and the end of the inner sleeve 211 are fixedly provided with ball sockets 240, so that the two ends of the electric tailgate strut can be connected to the vehicle body and the tailgate through the ball sockets 240 respectively.

[0039] This application provides an electric tailgate strut for automobiles. A drive motor 120 drives a lead screw 130 to rotate via a coupling. A nut 213, threadedly engaged with the lead screw 130, extends and retracts axially under the action of a moving assembly 210 composed of a reinforcing tube 214 and an inner sleeve 211, thereby pushing or pulling the tailgate to open or close. A support spring 212 provides static support force to balance the weight of the tailgate. A damper assembly 220 applies controllable damping to the rotation of the lead screw 130 through the frictional resistance between moving and stationary friction plates 221, providing support for the tailgate in a power-off or hovering state. The entire structure significantly improves the strut's compactness, environmental adaptability, operational stability, and load-bearing reliability by integrating the damper assembly 220 into the internal cavity 141 of the bearing 143 seat 142, using double waterproof ring seals, and hinged with ball joints 240 at both ends, combined with the rigid support design of the guide tube 230 and the reinforcing tube 214. It effectively solves the problems of large space occupation, poor sealing, insufficient support and weak assembly adaptability of dampers in existing technologies, and is especially suitable for intelligent electric control scenarios of large-mass tailgates.

[0040] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0041] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A support rod for an electric tailgate of an automobile, characterized in that, include: The support rod body includes an outer tube, a drive motor, and a lead screw. The drive motor is installed at the bottom of the outer tube, and the output shaft of the drive motor is connected to the lead screw. A bearing mechanism is provided between the lead screw and the outer tube, and the bearing mechanism has a cavity. The strut assembly includes a moving component and a damper assembly. The moving component is threadedly engaged with the lead screw. The damper assembly is installed in the cavity and is used to provide damping force for the rotation of the lead screw. The bearing mechanism and the damper assembly are located at the end of the lead screw.

2. The electric tailgate strut for automobiles as described in claim 1, characterized in that, The bearing mechanism includes a bearing housing and a bearing. The bearing housing is installed in the outer sleeve, and the bearing is installed at one end of the bearing housing. The cavity is located at the end of the bearing housing away from the bearing.

3. The electric tailgate strut for automobiles as described in claim 2, characterized in that, The damper assembly includes a static friction plate, a dynamic friction plate, a damping spring, and a spring cover. The static friction plate is disposed in the bearing housing via a spline connection. The dynamic friction plate is connected to the lead screw via a spline connection. The spring cover is detachably installed in the bearing housing. The damping spring is disposed between the spring cover and the static friction plate. The elastic force of the damping spring acts on the static friction plate and the dynamic friction plate.

4. The electric tailgate strut for automobiles as described in claim 3, characterized in that, There are multiple dynamic friction plates and static friction plates, and each side of the dynamic friction plate is provided with a corresponding static friction plate.

5. The automotive electric tailgate strut as described in claim 3, characterized in that, The dynamic friction pad is made of high-strength plastic, and the static friction pad is made of metal.

6. The electric tailgate strut for automobiles as described in claim 3, characterized in that, The moving component includes an inner sleeve and a support spring. The support spring is disposed inside the inner sleeve and sleeved outside the lead screw. One end of the support spring abuts against the end of the inner sleeve, and the other end of the support spring abuts against the spring cap.

7. The electric tailgate strut for automobiles as described in claim 6, characterized in that, The strut assembly also includes a guide tube, the end of which is fixedly connected to a spring cap, and the support spring is sleeved on the outside of the guide tube.

8. The automotive electric tailgate strut as described in claim 3, characterized in that, The lead screw passes through the spring cover, and a waterproof ring is provided between the inner wall of the spring cover and the lead screw. A waterproof ring is also provided between the bearing seat and the outer sleeve.

9. The electric tailgate strut for automobiles as described in claim 6, characterized in that, The movable component includes a nut and a reinforcing tube. The nut is threaded into a lead screw. One end of the reinforcing tube is fixedly connected to the nut, and the other end of the reinforcing tube is fixedly connected to the end of the inner sleeve.

10. The electric tailgate strut for automobiles as described in claim 9, characterized in that, Both the end of the outer sleeve and the end of the inner sleeve are fixedly provided with ball sockets.

Images