Small diameter electric tailgate support rod

Abstract

The utility model discloses a small diameter electric tail door stay rod, including stay rod main part and stay rod secondary body, and stay rod main part includes outer sleeve tube, drive motor and screw rod, and drive motor installs at the bottom of outer sleeve tube, and the output shaft of drive motor is connected with screw rod, stay rod secondary body includes inner sleeve tube and moving assembly, moving assembly with screw rod thread cooperation, inner sleeve tube is located the inside of outer sleeve tube, inner sleeve tube with outer sleeve tube sliding seal cooperation, moving assembly with inner sleeve tube's inner wall fixed connection. The small diameter electric tail door stay rod provided in the application, through canceling the waterproof structure inside traditional screw rod, setting first sealing element in one end of outer sleeve tube, setting second sealing element at the interface of relative motion of outer sleeve tube and inner sleeve tube realizes dynamic sealing, avoids the radial space occupation because of internal waterproof component and riveting technology, significantly reduces stay rod overall outer diameter, guarantees the reliable sealing performance of product under compact structure simultaneously.

Description

Technical Field

[0001] This utility model relates to the technical field of wing fan adjustment devices, and in particular to a small-diameter electric tailgate support rod. Background Technology

[0002] With the continuous improvement of automotive intelligence and comfort features, electric tailgate systems have gradually become popular from high-end models to mid-range and even entry-level models. The electric tailgate strut, as the core actuator of this system, achieves linear telescopic movement through a motor-driven screw and nut mechanism, thereby automatically opening and closing the tailgate. Its structure typically includes a geared motor, transmission components (such as couplings and screws), telescopic tube components (inner and outer tubes), ball joint connectors, and corresponding sealing and guiding structures. Due to the need to integrate the motor, transmission mechanism, and telescopic structure, traditional electric struts have a relatively large overall outer diameter, generally between 32mm and 35mm. With the increasingly compact design trend of rear space in vehicles, this often leads to difficulties in installation due to insufficient space, especially posing a significant limitation for small SUVs, crossovers, or hatchback models.

[0003] Specifically, existing electric tailgate struts generally use a large outer tube diameter to ensure sufficient travel, structural strength, and waterproof performance. They rely on complex internal waterproof structures (such as waterproof rings at the lead screw) and riveting to fix key components. Although this can meet basic functional requirements, it results in a large overall product size, making it difficult to adapt to space-constrained vehicle body structures. Summary of the Invention

[0004] This application provides a small-diameter electric tailgate support rod, which solves the technical problem that the existing electric tailgate support rods have a large outer diameter due to the use of an internal screw waterproof structure and riveting connection method, making it difficult to adapt to vehicles with limited space.

[0005] This application provides a small-diameter electric tailgate support rod, comprising: 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. The strut assembly includes an inner sleeve and a moving component. The moving component is threadedly engaged with the lead screw. The inner sleeve is located inside the outer sleeve and is slidably sealed to the outer sleeve. The moving component is fixedly connected to the inner wall of the inner sleeve. The outer sleeve is provided with a first seal at the end extending away from the inner sleeve, and a second seal is provided at the end extending near the inner sleeve. The second seal is configured to provide a dynamic seal at the interface between the relative movement of the outer sleeve and the inner sleeve.

[0006] In some embodiments, the second sealing element is a waterproof sleeve fitted onto the end of the outer sleeve, the lip of the waterproof sleeve being interference-fitted with the outer wall of the inner sleeve.

[0007] In some embodiments, a guide sleeve is snapped onto the inner wall of the outer sleeve, the inner wall of the guide sleeve contacts the outer wall of the inner sleeve, the waterproof sleeve is snapped onto the outer sleeve, and the waterproof sleeve covers the guide sleeve.

[0008] In some embodiments, the second sealing element is an annular sealing ring disposed on the inner side of the end of the outer sleeve, and acts between the inner wall of the outer sleeve and the outer wall of the inner sleeve.

[0009] In some embodiments, the strut body further includes a first ball socket, which is fixed to the end of the outer sleeve that extends away from the inner sleeve by riveting, and the first seal is located between the first ball socket and the drive motor.

[0010] In some embodiments, the moving component includes a nut and a nut tube, the nut being threaded into a lead screw and fixedly connected to the nut tube, and a support ring being fixedly provided at the end of the lead screw away from the drive motor, the support ring being used to support the nut tube.

[0011] In some embodiments, the outer surface of the nut is provided with a groove, the nut is threaded to the nut tube, and the tube wall of the nut tube is riveted at the position corresponding to the groove, so that part of the tube wall material of the nut tube is embedded in the groove to form an anti-loosening structure.

[0012] In some embodiments, the strut assembly further includes a second ball socket, which is fixedly connected to the end of the nut tube away from the nut.

[0013] In some embodiments, the connecting portion of the second ball socket is located between the nut tube and the inner sleeve, the second ball socket is threaded to the nut tube, the second ball socket is fastened to the nut tube with screws to prevent loosening, and the second ball socket is riveted to the inner sleeve.

[0014] In some embodiments, a bearing seat is fixedly provided inside the outer sleeve, a connector is fixedly provided between the bearing seat and the drive motor, a bearing is provided between the bearing seat and the lead screw, a guide tube is fixedly provided at the end of the bearing seat, the guide tube is sleeved on the outside of the nut tube, and the guide tube is slidably engaged with the nut tube.

[0015] The beneficial effects of this application are as follows: The electric tailgate strut with a small diameter provided in this application achieves dynamic sealing by eliminating the internal waterproof structure of the traditional screw rod, setting a first seal at one end of the outer sleeve, and setting a second seal at the interface between the outer sleeve and the inner sleeve. This avoids the radial space occupation caused by the internal waterproof components and riveting process, significantly reduces the overall outer diameter of the strut, and ensures reliable sealing performance of the product in a compact structure. 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 This application provides an overall structural schematic diagram of a small-diameter electric tailgate support rod; Figure 2 A cross-sectional view of a small-diameter electric tailgate support rod provided in this application; Figure 3 A schematic diagram of the main body of a small-diameter electric tailgate support rod provided in this application; Figure 4 This application provides a schematic diagram of the assembly structure of the strut support body in a small-diameter electric tailgate strut. Figure 5 A schematic diagram of the moving component in a small-diameter electric tailgate support rod provided in this application; Figure 6 A schematic diagram of the connection structure between the bearing housing and the guide tube in a small-diameter electric tailgate support rod provided in this application; Figure 7 A schematic diagram of the connection structure between the second ball socket and the nut tube in a small-diameter electric tailgate support rod provided in this application; Figure 8 A schematic diagram illustrating the fit between the second ball socket, nut tube, and inner sleeve in a small-diameter electric tailgate support rod provided in this application; Figure 9 An exploded view of the second seal and outer sleeve in a small-diameter electric tailgate strut provided in this application.

[0018] Among them, 10, strut body; 11, outer sleeve; 12, drive motor; 13, lead screw; 14, first seal; 15, guide sleeve; 16, first ball socket; 17, support ring; 18, bearing seat; 19, connector; 20, strut sub-body; 21, inner sleeve; 22, moving assembly; 221, nut; 222, nut tube; 23, second seal; 24, pressure groove; 25, second ball socket; 251, cavity; 26, bearing; 27, guide tube. 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 a small-diameter electric tailgate support rod, which solves the technical problem in the prior art where the electric tailgate support rod has a large outer diameter due to the use of an internal threaded waterproof structure and riveting connection, making it difficult to adapt to vehicles with limited 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 1-9As shown, this application provides a small-diameter electric tailgate support rod, including a support rod body 10 and a support rod sub-body 20. The support rod body 10 includes an outer sleeve 11, a drive motor 12, and a lead screw 13. The drive motor 12 is installed at the bottom of the outer sleeve 11, and the output shaft of the drive motor 12 is connected to the lead screw 13. The support rod sub-body 20 includes an inner sleeve 21 and a moving component 22. The moving component 22 is threadedly engaged with the lead screw 13. The inner sleeve 21 is located inside the outer sleeve 11 and is slidably sealed to the outer sleeve 11. The moving component 22 is fixedly connected to the inner wall of the inner sleeve 21. A first sealing element 14 is provided at the end of the outer sleeve 11 that extends away from the inner sleeve 21, and a second sealing element 23 is provided at the end of the outer sleeve 11 that extends near the inner sleeve 21. The second sealing element 23 is configured to provide a dynamic seal at the relative movement interface between the outer sleeve 11 and the inner sleeve 21.

[0024] By eliminating the internal waterproof structure of the traditional lead screw 13, a first seal 14 is set at one end of the outer sleeve 11, and a second seal 23 is set at the relative movement interface between the outer sleeve 11 and the inner sleeve 21 to achieve dynamic sealing. This avoids the radial space occupation caused by the internal waterproof components and riveting process, significantly reduces the overall outer diameter of the strut, and ensures the reliable sealing performance of the product under a compact structure.

[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] Optionally, the second sealing element 23 is a waterproof sleeve fitted onto the end of the outer sleeve 11. The lip of the waterproof sleeve is interference-fitted with the outer wall of the inner sleeve 21, achieving effective dynamic sealing between the outer sleeve 11 and the inner sleeve 21 during relative movement without increasing the radial dimension. This eliminates the complex waterproof components inside the traditional lead screw 13, simplifies the internal layout, and helps to reduce the overall outer diameter of the support rod. At the same time, the lip structure of the waterproof sleeve has good following and sealing reliability, improving the product's environmental adaptability and durability in compact spaces.

[0027] Furthermore, a guide sleeve 15 is snapped onto the inner wall of the outer sleeve 11. The inner wall of the guide sleeve 15 contacts the outer wall of the inner sleeve 21, providing stable guidance for the extension and retraction of the inner sleeve 21. The waterproof sleeve is snapped onto the outer sleeve 11, covering the outside of the guide sleeve 15. The lip of the waterproof sleeve contacts the end of the guide sleeve 15. This achieves both axial limiting and protection of the guide sleeve 15, and simplifies the assembly process through the integrated snap-fit ​​structure, avoiding additional fasteners occupying radial space. While ensuring smooth movement and reliable sealing, it effectively reduces the number of parts and structural redundancy, which is conducive to reducing the overall diameter of the support rod and improving the product's adaptability in space-constrained vehicle models.

[0028] Alternatively, the second sealing element 23 can be an annular sealing ring disposed on the inner side of the end of the outer sleeve 11. Its cross-section is preferably rectangular, which has a larger contact area and stronger anti-extrusion ability compared to a circular cross-section. During the reciprocating motion of the inner sleeve 21, it can effectively prevent the sealing ring from shifting or falling out due to pressure, ensuring the long-term reliability of dynamic sealing. The annular sealing ring acts between the inner wall of the outer sleeve 11 and the outer wall of the inner sleeve 21, and its elastic deformation tightly fits the outer wall of the inner sleeve 21, forming a reliable dynamic sealing interface during the relative sliding process of the outer sleeve 11 and the inner sleeve 21. This structure does not require additional brackets or complex waterproof components. It can achieve effective dust and water protection by relying solely on the interference fit between the sealing ring and the two pipe walls. It not only simplifies the internal structure and reduces the radial space occupation, but also helps to control the overall outer diameter of the support rod.

[0029] Preferred, such as Figure 2 , Figure 3 As shown, the main body 10 of the strut also includes a first ball socket 16, which is fixed to the end of the outer sleeve 11 that extends away from the inner sleeve 21 by riveting. The first seal 14 is located between the first ball socket 16 and the drive motor 12. The existing riveted ball socket is used as an axial stop for the seal, eliminating the need for additional sealing mounting seats or fastening structures. This ensures effective static sealing at the motor end, preventing moisture and dust from entering the motor area along the inner cavity of the outer sleeve 11, and avoids increasing the radial dimension due to the addition of a sealing support structure. At the same time, the riveting connection ensures the high strength and compactness of the first ball socket 16, and the overall structure is simple and reliable.

[0030] Preferably, the moving component 22 includes a nut 221 and a nut 221 tube. The nut 221 is threadedly engaged with the lead screw 13, and the nut 221 is fixedly connected to the nut 221 tube. A support ring 17 is fixedly provided at the end of the lead screw 13 away from the drive motor 12. The support ring 17 is used to support the nut 221 tube. Without increasing the external contour dimensions, it significantly enhances the structural stability of the nut 221 tube in the extended state, effectively suppressing swaying, shaking, or local deformation caused by the cantilever effect, thereby improving the stability and load-bearing capacity of the strut. At the same time, the support ring 17 is integrated into the end of the lead screw 13, making full use of the internal axial space and avoiding the influence of additional support components on the radial dimensions.

[0031] Furthermore, the outer surface of the nut 221 is provided with a groove 24. The nut 221 is threaded to the nut 221 tube. The tube wall of the nut 221 is riveted at the corresponding position of the groove 24, so that part of the tube wall material of the nut 221 is embedded in the groove 24 to form an anti-loosening structure. The metal material of the nut 221 tube is plastically deformed and embedded in the groove 24 to form a mechanically interlocking anti-loosening structure. This connection method does not require the use of additional anti-loosening elements such as thread sealant, pins or snap rings, which simplifies the assembly process and avoids radial space occupation caused by additional parts. At the same time, the interlocking structure formed by riveting can effectively resist the loosening tendency of the nut 221 under repeated alternating loads, significantly improving the reliability and durability of the connection between the nut 221 and the nut 221 tube.

[0032] Preferred, such as Figure 2 , Figure 4 , Figure 5 As shown, the strut assembly 20 also includes a second ball socket 25, which is fixedly connected to the end of the nut 221 tube away from the nut 221.

[0033] The connecting part of the second ball socket 25 is located between the nut 221 tube and the inner sleeve 21. The second ball socket 25 and the nut 221 tube are connected by threads, and the second ball socket 25 and the nut 221 tube are fastened with screws to prevent loosening. The second ball socket 25 and the inner sleeve 21 are fixedly connected by riveting, and a screw is screwed through the side wall of the ball socket into the nut 221 tube to achieve double fastening to prevent loosening. On the other hand, the outer periphery of the second ball socket 25 is fixed to the end of the inner sleeve 21 by riveting to form a rigid mechanical connection, so that the interior of the second ball socket 25 has a cavity 251. Under the same size conditions, this structure can accommodate a longer lead screw 13, thereby increasing the travel of the lead screw 13 and improving the tailgate's lifting range. Furthermore, this composite connection structure makes full use of the radial space between the nut 221 tube and the inner sleeve 21, avoiding the outward protruding installation structure required for traditional riveted ball sockets, and significantly reducing the local outer contour size.

[0034] Preferably, a bearing seat 18 is fixedly provided inside the outer sleeve 11, a connector 19 is fixedly provided between the bearing seat 18 and the drive motor 12, a bearing 26 is provided between the bearing seat 18 and the lead screw 13, a guide tube 27 is fixedly provided at the end of the bearing seat 18, the guide tube 27 is sleeved on the outside of the nut 221 tube, and the guide tube 27 is slidably engaged with the nut 221 tube.

[0035] Specifically, the bearing housing 18 can be fixed to the outer sleeve 11 and the connector 19 by riveting, threading, or interference fit. The guide tube 27 is fixed to the end face of the bearing housing 18 by threaded connection or press fitting. Its inner wall is precision machined to ensure clearance fit or slight interference sliding with the outer wall of the nut 221 tube. The bearing housing 18 and the guide tube 27 are connected by threads, and thread sealant is applied to prevent loosening. The guide tube 27 provides full radial constraint to the nut 221 tube, effectively suppressing its swaying and deflection during the extension and contraction process, improving operational stability and load-bearing rigidity. At the same time, all components are compactly arranged axially inside the outer sleeve 11 without adding additional radial components, making full use of the existing assembly space, and achieving a smaller overall diameter of the strut while ensuring structural strength and motion accuracy.

[0036] 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.

[0037] 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 small-diameter electric tailgate support rod, 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. The strut assembly includes an inner sleeve and a moving component. The moving component is threadedly engaged with the lead screw. The inner sleeve is located inside the outer sleeve and is slidably sealed to the outer sleeve. The moving component is fixedly connected to the inner wall of the inner sleeve. The outer sleeve is provided with a first seal at the end extending away from the inner sleeve, and a second seal is provided at the end extending near the inner sleeve. The second seal is configured to provide a dynamic seal at the interface between the relative movement of the outer sleeve and the inner sleeve.

2. The small-diameter electric tailgate support rod as described in claim 1, characterized in that, The second sealing element is a waterproof sleeve fitted onto the end of the outer sleeve, and the lip of the waterproof sleeve is interference-fitted with the outer wall of the inner sleeve.

3. The small-diameter electric tailgate support rod as described in claim 2, characterized in that, The inner wall of the outer sleeve is fitted with a guide sleeve, the inner wall of the guide sleeve is in contact with the outer wall of the inner sleeve, the waterproof sleeve is fitted with the outer sleeve, and the waterproof sleeve covers the guide sleeve.

4. The small-diameter electric tailgate support rod as described in claim 1, characterized in that, The second sealing element is an annular sealing ring disposed on the inner side of the end of the outer sleeve, and acts between the inner wall of the outer sleeve and the outer wall of the inner sleeve.

5. The small-diameter electric tailgate support rod as described in claim 1, characterized in that, The strut body also includes a first ball socket, which is fixed to the end of the outer sleeve that extends away from the inner sleeve by riveting. The first seal is located between the first ball socket and the drive motor.

6. The small-diameter electric tailgate support rod as described in claim 1, characterized in that, The moving component includes a nut and a nut tube. The nut is threaded into a lead screw and is fixedly connected to the nut tube. A support ring is fixedly provided at the end of the lead screw away from the drive motor, and the support ring is used to support the nut tube.

7. The small-diameter electric tailgate support rod as described in claim 6, characterized in that, The outer side of the nut is provided with a groove. The nut is threaded to the nut tube. The tube wall of the nut tube is riveted at the position corresponding to the groove, so that part of the tube wall material of the nut tube is embedded in the groove to form an anti-loosening structure.

8. The small-diameter electric tailgate support rod as described in claim 6, characterized in that, The strut assembly also includes a second ball socket, which is fixedly connected to the end of the nut tube away from the nut.

9. The small-diameter electric tailgate support rod as described in claim 8, characterized in that, The connecting part of the second ball socket is located between the nut tube and the inner sleeve. The second ball socket is connected to the nut tube by threads. The second ball socket is fastened to the nut tube by screws to prevent loosening. The second ball socket is fixedly connected to the inner sleeve by riveting.

10. The small-diameter electric tailgate support rod as described in claim 6, characterized in that, A bearing seat is fixedly installed inside the outer sleeve. A connector is fixedly installed between the bearing seat and the drive motor. A bearing is fitted between the bearing seat and the lead screw. A guide tube is fixedly installed at the end of the bearing seat. The guide tube is sleeved on the outside of the nut tube and slides with the nut tube.

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