Support rod device, vehicle door opening and closing system and vehicle
By introducing a guide structure into the electric strut device, the problem of radial deformation of the coil spring during extension and retraction is solved, resulting in a quieter door operation experience.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-03-03
AI Technical Summary
During the extension and retraction process of existing electric struts, the helical spring is prone to radial deformation, which can cause friction or collision with the inner tube, resulting in abnormal noise and affecting comfort.
A strut device was designed, including a nut push tube with a guide structure. The guide structure consists of a guide bar and a reinforcing rib, which guides the extension and retraction of the helical spring, ensuring that the helical spring moves in a predetermined direction and avoiding radial deformation.
By guiding the structure, friction or collision between the coil spring and the surrounding structure is avoided, thus improving vehicle comfort and reducing abnormal noises.
Smart Images
Figure CN223964355U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of automotive parts, and in particular to a strut device, a door opening and closing system, and a vehicle. Background Technology
[0002] With the development of intelligent and comfortable vehicles, many cars are now equipped with power tailgates. Power tailgates use a power strut to open, close, and hover the tailgate. The power strut typically includes a coil spring to assist in opening, closing, and hovering. However, in existing power struts, the coil spring undergoes radial deformation during extension and retraction, causing friction or collision with the inner tube, resulting in abnormal noise and affecting comfort. Utility Model Content
[0003] The strut device, door opening and closing system and vehicle provided in this application can solve the technical problem in the prior art that the helical spring is prone to radial deformation when the electric strut extends and retracts, which causes friction or collision with the inner tube, resulting in abnormal noise and affecting comfort.
[0004] To solve the above-mentioned technical problems, one technical solution adopted in this application is: providing a strut device, the strut device comprising: a driving device; a main shaft, arranged along the length direction of the driving device and connected to the driving device in a transmission manner; a nut push tube, sleeved on the main shaft and screwed to the main shaft, the outer wall of the nut push tube having a guide structure; a first retainer, sleeved on the end of the driving device away from the main shaft; a second retainer, sleeved on the end of the nut push tube away from the driving device; and a helical spring, one end of the helical spring sleeved and fixed to the first retainer, and the other end of the helical spring sleeved and fixed to the second retainer; wherein, the guide structure can guide the extension and retraction movement of the helical spring.
[0005] In some embodiments, the gap between the helical spring and the guide structure is less than or equal to 4 mm.
[0006] In some embodiments, the guide structure includes a plurality of guide bars distributed along the periphery of the nut push tube and extending along the length of the nut push tube.
[0007] In some embodiments, the guide structure further includes a plurality of reinforcing ribs, which are connected between any two adjacent guide strips.
[0008] In some embodiments, a plurality of the reinforcing ribs are arranged in a circumferential array along the nut push tube to form an annular reinforcing rib array, and the annular reinforcing rib array is arranged along the length direction of the nut push tube.
[0009] In some embodiments, the distance between the reinforcing rib and the central axis of the nut push tube is less than the distance between the guide strip and the central axis of the nut push tube.
[0010] In some embodiments, the strut device further includes a first ball-and-socket connector, which includes an internal threaded connection portion, a transition portion, and a ball-and-socket connection portion. The transition portion is connected between the internal threaded connection portion and the ball-and-socket connection portion. The nut push tube further includes a nut portion and an external threaded connection portion. The nut portion is disposed inside the guide structure, which is connected to the external threaded connection portion. The internal threaded connection portion is screwed to the external threaded connection portion, such that the first ball-and-socket connector is screwed to the nut push tube. The main shaft has a screw portion, and the nut portion is screwed to the screw portion, such that the nut push tube is screwed to the main shaft.
[0011] In some embodiments, the interior of the transition section is hollowed out.
[0012] In some embodiments, the second retainer is sleeved on the internally threaded connection portion.
[0013] In some embodiments, the strut device further includes a second ball-and-socket connector, which is limitedly connected to the drive device. The drive device is located between the second ball-and-socket connector and the main shaft, and the first retainer is sleeved on the second ball-and-socket connector.
[0014] In some embodiments, the strut assembly further includes a coupling connected between the output end of the drive device and the input end of the spindle.
[0015] In some embodiments, the strut device further includes a damper, which is sleeved on the coupling, and the friction plate in the damper is connected to the coupling in a driving connection.
[0016] In some embodiments, the strut device further includes a seal, a bearing, and a mounting base. The mounting base is limitedly connected to the damper. The bearing and the seal are disposed within the mounting base. The bearing is located between the damper and the seal. The edge of the seal is fitted and sealed to the internal structure of the mounting base. The input end of the spindle passes through the seal and the bearing, and the input end of the spindle is squeezed and sealed to the seal.
[0017] In some embodiments, the strut assembly further includes a sleeve in which the drive unit, the damper, and the mounting base are housed.
[0018] In some embodiments, the strut assembly further includes a second ball-and-socket connector, which is inserted into the opening of the sleeve and laser-welded to the sleeve.
[0019] In some embodiments, the second ball joint connector includes a connected insertion connection portion and a limiting edge, the insertion connection portion being inserted into the opening of the sleeve, and the first retainer including a first sub-retainer and a second sub-retainer, the first sub-retainer and the second sub-retainer being closed to fit over the limiting edge and a portion of the sleeve structure.
[0020] In some embodiments, the drive device includes a motor assembly and a gearbox assembly, the motor assembly and the gearbox assembly being drively connected.
[0021] Another technical solution adopted in this application is: providing a car door opening and closing system, the car door opening and closing system including: a car tailgate; a strut device, one end of the strut device being connected to the car tailgate and the other end of the strut device being connected to the car body; a balance spring, one end of the balance spring being connected to the car tailgate and the other end of the balance spring being connected to the car body; wherein, the strut device is any of the strut devices described above.
[0022] Another technical solution adopted in this application is to provide a vehicle, which includes the above-mentioned door opening and closing system.
[0023] The beneficial effects of this application are as follows: Unlike existing technologies, the strut device provided in this application includes: a drive device; a main shaft, arranged along the length of the drive device and connected to it in a transmission manner; a nut push tube, sleeved on and screwed to the main shaft, with a guide structure on its outer wall; a first retainer, sleeved on the end of the drive device away from the main shaft; a second retainer, sleeved on the end of the nut push tube away from the drive device; and a helical spring, one end of which is sleeved and fixed to the first retainer, and the other end of which is sleeved and fixed to the second retainer. The guide structure guides the extension and retraction of the helical spring. In this way, during the extension and retraction process, the helical spring inside the strut device is less prone to radial deformation under the guidance of the guide structure, avoiding friction or collision between the helical spring and surrounding structures, thereby preventing abnormal noise and improving comfort. Attached Figure Description
[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0025] Figure 1 These are schematic diagrams of the vehicle structure provided in some embodiments of this application;
[0026] Figure 2 This is a schematic diagram of the strut device provided in some embodiments of this application;
[0027] Figure 3 This is an exploded view of the strut device provided in some embodiments of this application;
[0028] Figure 4 This is a schematic diagram of the nut push tube provided in some embodiments of this application.
[0029] Explanation of reference numerals in the attached drawings: 10000 - Vehicle, 1000 - Door opening and closing system, 100 - Car tailgate, 200 - Stirrer assembly, 210 - Drive unit, 211 - Motor assembly, 212 - Gearbox assembly, 220 - Main shaft, 221 - Screw section, 230 - Nut push tube, 231 - Guide structure, 2311 - Guide bar, 2312 - Reinforcing rib, 232 - Nut section, 233 - External threaded connection section, 240 - First retainer, 241 - First sub-retainer, 242 - Second sub-retainer Holder, 250-Second retainer, 260-Helical spring, 270-First ball socket connector, 271-Internal threaded connection, 272-Transition part, 273-Ball socket connector, 280-Second ball socket connector, 281-Insertion connection, 282-Limit edge, 290-Coupling, 2010-Damper, 2011-Friction pad, 2012-Wave spring, 2020-Seal, 2030-Bearing, 2040-Mounting base, 2050-Sleeve, 300-Balance tension spring. Detailed Implementation
[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It is understood that the specific embodiments described herein are only for explaining this application and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings, not all structures. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0031] The terms "first," "second," and "third" in this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. 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 relationships and movements between components in a specific orientation (as shown in the figures). If the specific orientation changes, the directional indications also change accordingly. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.
[0032] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0033] In this application, the length direction refers to the direction indicated by the axis or centerline of the object.
[0034] The strut device provided in this application includes: a drive unit; a main shaft arranged along the length of the drive unit and connected to it in a transmission manner; a nut push tube sleeved on and screwed to the main shaft, the outer wall of the nut push tube having a guide structure; a first retainer sleeved on the end of the drive unit away from the main shaft; a second retainer sleeved on the end of the nut push tube away from the drive unit; and a helical spring, one end of which is sleeved and fixed to the first retainer, and the other end of which is sleeved and fixed to the second retainer, the drive unit and the nut push tube being located inside the helical spring; wherein, the guide structure can guide the extension and retraction movement of the helical spring. In this way, during the extension and retraction process of the strut device, the helical spring inside is less prone to radial deformation under the guidance of the guide structure, avoiding friction or collision between the helical spring and surrounding structures, thereby preventing abnormal noise and improving comfort.
[0035] Please see Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 10000 provided in this application may include, but is not limited to, a door opening and closing system 1000. The door opening and closing system 1000 is an important component of an automobile, used to realize the opening and closing of the doors. The door opening and closing system 1000 may include, but is not limited to, a tailgate 100, a strut device 200, and a balance spring 300. Specifically, one end of the strut device 200 is connected to the tailgate 100, and the other end of the strut device 200 is connected to the vehicle body to drive the tailgate 100 to move between a fully open position and a fully closed position. One end of the balance spring 300 is connected to the tailgate 100, and the other end of the balance spring 300 is connected to the vehicle body to assist in the opening, closing, and hovering of the tailgate 100.
[0036] Please refer to the following: Figures 2-4 , Figure 2 This is a structural schematic diagram of the strut device provided in some embodiments of this application. Figure 3 This is an exploded view of the strut device provided in some embodiments of this application. Figure 4 This is a schematic diagram of the structure of the nut push tube provided in some embodiments of this application. The strut device 200 provided in this application may include, but is not limited to, a drive device 210, a main shaft 220, a nut push tube 230, a first retainer 240, a second retainer 250, and a helical spring 260. Specifically, the main shaft 220 is arranged along the length direction of the drive device 210 and is connected to the drive device 210 for transmission, so as to rotate when driven. The nut push tube 230 is sleeved on the main shaft 220 and screwed to the main shaft 220 to convert the rotational motion of the main shaft 220 into linear reciprocating motion. The drive device 210 and the nut push tube 230 are located inside the helical spring 260. The outer wall of the nut push tube 230 is provided with a guide structure 231. The guide structure 231 can guide the extension and retraction of the helical spring 260 to ensure that the helical spring 260 extends and retracts in a predetermined direction and avoids twisting or irregular movement during the extension and retraction process. The first retainer 240 is sleeved on the end of the drive device 210 away from the main shaft 220. The second retainer 250 is sleeved on the end of the nut push tube 230 away from the drive device 210. One end of the helical spring 260 is sleeved and fixed to the first retainer 240. The other end of the helical spring 260 is sleeved and fixed to the second retainer 250. In this embodiment, helical grooves adapted to the shape of the helical spring 260 are formed on the outer peripheral surfaces of both the first retainer 240 and the second retainer 250. The two ends of the helical spring 260 are respectively installed in the corresponding helical grooves, so as to utilize the restoring force of the helical spring 260 itself to improve the connection strength between the helical spring 260 and the helical grooves on the first retainer 240 and the second retainer 250, thereby ensuring the installation of the helical spring 260.
[0037] Furthermore, the gap between the helical spring 260 and the guide structure 231 is less than or equal to 4 mm. Specifically, the gap between the helical spring 260 and the guide structure 231 can be 0 mm, 0.30 mm, 0.50 mm, 0.75 mm, 0.90 mm, 1 mm, 1.22 mm, 1.38 mm, 1.57 mm, 1.86 mm, 2.29 mm, 2.55 mm, 2.92 mm, 3.24 mm, 3.76 mm, or 4 mm. In this embodiment, the gap between the helical spring 260 and the guide structure 231 is 0.99 mm.
[0038] Furthermore, the guide structure 231 includes a plurality of guide bars 2311. Specifically, the plurality of guide bars 2311 are distributed along the circumference of the nut push tube 230. The guide bars 2311 extend along the length direction of the nut push tube 230. In this way, the radial offset of the helical spring 260 during the extension and retraction process can be reduced, the extension and retraction stability of the helical spring 260 can be enhanced, and the helical spring 260 can perform stable linear movement along the axial direction of the nut push tube 230 during the extension and retraction process.
[0039] Furthermore, the guide structure 231 also includes several reinforcing ribs 2312. These reinforcing ribs 2312 are connected between any two adjacent guide strips 2311 to prevent deformation or displacement of the guide strips 2311 and improve their structural stability. The reinforcing ribs 2312 are arranged in a ring-shaped array along the circumference of the nut push tube 230. This ring-shaped array of reinforcing ribs is also arranged along the length of the nut push tube 230. This further enhances the overall rigidity of the guide structure 231, ensuring the stability of the shape and position of the guide strips 2311.
[0040] Furthermore, the distance between the reinforcing rib 2312 and the central axis of the nut push tube 230 is less than the distance between the guide bar 2311 and the central axis of the nut push tube 230, so as to avoid affecting the guiding effect of the guide bar 2311 on the helical spring 260.
[0041] Furthermore, the strut device 200 also includes a first ball-and-socket connector 270. The first ball-and-socket connector 270 may include, but is not limited to, an internal threaded connection portion 271, a transition portion 272, and a ball-and-socket connection portion 273. The transition portion 272 connects the internal threaded connection portion 271 and the ball-and-socket connection portion 273. The nut push tube 230 also includes a nut portion 232 and an external threaded connection portion 233. The nut portion 232 is disposed inside the guide structure 231. The guide structure 231 is connected to the external threaded connection portion 233. The internal threaded connection portion 271 and the external threaded connection portion 233 are screwed together, so that the first ball-and-socket connector 270 is screwed to the nut push tube 230, thereby enabling the nut push tube 230 to drive the first ball-and-socket connector 270 to perform linear reciprocating motion. The second retainer 250 is sleeved on the internal threaded connection portion 271 to move with the linear reciprocating motion of the first ball-and-socket connector 270, thereby causing the helical spring 260 to extend and retract along the guide structure 231. The main shaft 220 has a screw portion 221. The nut portion 232 is screwed to the screw portion 221, so that the nut push tube 230 is screwed to the main shaft 220, thereby enabling the rotational motion of the main shaft 220 to be converted into the linear reciprocating motion of the nut push tube 230.
[0042] Furthermore, the internal hollowing of the transition section 272 allows the main shaft 220 to extend into the transition section 272, thereby increasing the stroke of the nut push tube 230 to accommodate more vehicle models.
[0043] Furthermore, the strut assembly 200 also includes a second ball-and-socket connector 280. The second ball-and-socket connector 280 is connected to the drive device 210 in a limiting connection to restrict the rotation of the drive device 210. The drive device 210 is located between the second ball-and-socket connector 280 and the main shaft 220. A first retainer 240 is sleeved on the second ball-and-socket connector 280.
[0044] Furthermore, the strut assembly 200 also includes a coupling 290. The coupling 290 is connected between the output end of the drive unit 210 and the input end of the spindle 220 to prevent misalignment between the output end of the drive unit 210 and the input end of the spindle 220, which could cause the spindle 220 to bounce or vibrate.
[0045] Furthermore, the strut assembly 200 also includes a damper 2010. The damper 2010 provides damping, allowing the tailgate 100 to hover at any position between fully open and fully closed. The damper 2010 is fitted onto the coupling 290 to reduce the fixed length of the strut assembly 200, thereby enabling the strut assembly 200 to be adapted to more vehicle models. In this embodiment, the damper 2010 is a friction plate damper. The friction plates 2011 in the damper 2010 are drive-connected to the coupling 290 to provide braking damping to the coupling 290.
[0046] Furthermore, the strut assembly 200 also includes a seal 2020, a bearing 2030, and a mounting base 2040. The mounting base 2040 is connected to the damper 2010 for limiting, ensuring the damper 2010 is relatively fixed in position, allowing it to accurately perform its damping function within the strut assembly 200. The bearing 2030 and seal 2020 are disposed within the mounting base 2040. The bearing 2030 is located between the damper 2010 and the seal 2020. The edge of the seal 2020 is fitted and sealed with the internal structure of the mounting base 2040 to prevent external dust or liquids from entering the drive unit 210. The input end of the spindle 220 passes through the seal 2020 and the bearing 2030. The input end of the spindle 220 is press-sealed with the seal 2020 to further prevent external dust or liquids from entering the drive unit 210.
[0047] Furthermore, the strut assembly 200 also includes a sleeve 205. The drive unit 210, the damper 2010, and the mounting base 2040 are housed in the sleeve 205.
[0048] Furthermore, the strut device 200 also includes a second ball-and-socket connector 280. The second ball-and-socket connector 280 is inserted into the opening of the sleeve 205 and laser-welded to the sleeve 205 to improve the waterproof and dustproof properties of the strut device 200 and prevent external dust or liquids from entering the drive unit 210.
[0049] Furthermore, the second ball-and-socket connector 280 may include, but is not limited to, the connected insertion connector 281 and the limiting edge 282. The insertion connector 281 is inserted into the opening of the sleeve 205. The first retainer 240 includes a first sub-retainer 241 and a second sub-retainer 242. The first sub-retainer 241 and the second sub-retainer 242 cover each other to fit over the limiting edge 282 and a portion of the sleeve 205. By adopting this method, the assembly steps of the strut assembly 200 are simplified, and the production and assembly efficiency of the strut assembly 200 is improved.
[0050] Furthermore, the drive unit 210 includes a motor assembly 211 and a gearbox assembly 212, which are connected in a transmission manner. In this embodiment, the gearbox assembly 212 is a planetary gear reducer.
[0051] The strut device 200 provided in this application includes: a drive device 210; a main shaft 220, arranged along the length of the drive device 210 and connected to the drive device 210 in a transmission manner; a nut push tube 230, sleeved on the main shaft 220 and screwed to the main shaft 220, with a guide structure 231 on the outer wall of the nut push tube 230; a first retainer 240, sleeved on the end of the drive device 210 away from the main shaft 220; a second retainer 250, sleeved on the end of the nut push tube 230 away from the drive device 210; and a helical spring 260, one end of which is sleeved and fixed to the first retainer 240, and the other end of which is sleeved and fixed to the second retainer 250. The drive device 210 and the nut push tube 230 are located inside the helical spring 260. The guide structure 231 can guide the extension and retraction of the helical spring 260. In this way, during the extension and retraction of the strut device 200, the helical spring 260 inside is less likely to undergo radial deformation under the guidance of the guide structure 231, thus avoiding friction or collision between the helical spring 260 and the surrounding structure, thereby avoiding abnormal noise and improving comfort.
[0052] The above description is only a part of the embodiments of this application and does not limit the scope of protection of this application. Any equivalent device or equivalent process transformation made based on the content of this application specification and drawings, or direct or indirect application in other related technical fields, are similarly included in the patent protection scope of this application.
Claims
1. A strut device, characterized in that, include: Drive unit; The main shaft is arranged along the length of the drive device and is connected to the drive device in a transmission manner. A nut push tube is sleeved on the main shaft and screwed to the main shaft, and the outer wall of the nut push tube is provided with a guide structure; A first retainer is fitted onto the end of the drive device away from the main shaft; The second retainer is sleeved on the end of the nut push tube away from the drive device; A helical spring, one end of which is sleeved and fixed to the first retainer, and the other end of which is sleeved and fixed to the second retainer, wherein the driving device and the nut push tube are located inside the helical spring; The guide structure can guide the extension and retraction of the helical spring.
2. The strut device according to claim 1, characterized in that, The gap between the helical spring and the guide structure is less than or equal to 4 mm.
3. The strut device according to claim 1, characterized in that, The guide structure includes a plurality of guide bars, which are distributed along the periphery of the nut push tube and extend along the length of the nut push tube.
4. The strut device according to claim 3, characterized in that, The guide structure also includes several reinforcing ribs, which are connected between any two adjacent guide strips.
5. The strut device according to claim 4, characterized in that, A plurality of the reinforcing ribs are arranged in a circumferential array along the nut push tube to form an annular reinforcing rib array, and the annular reinforcing rib array is arranged along the length direction of the nut push tube.
6. The strut device according to claim 4, characterized in that, The distance between the reinforcing rib and the central axis of the nut push tube is less than the distance between the guide strip and the central axis of the nut push tube.
7. The strut device according to claim 1, characterized in that, The strut device further includes a first ball-and-socket connector, which includes an internal threaded connection portion, a transition portion, and a ball-and-socket connection portion. The transition portion is connected between the internal threaded connection portion and the ball-and-socket connection portion. The nut push tube further includes a nut portion and an external threaded connection portion. The nut portion is disposed inside the guide structure. The guide structure is connected to the external threaded connection portion. The internal threaded connection portion is screwed to the external threaded connection portion, so that the first ball-and-socket connector is screwed to the nut push tube. The main shaft has a screw portion, and the nut portion is screwed to the screw portion, so that the nut push tube is screwed to the main shaft.
8. The strut device according to claim 7, characterized in that, The transition section has an internal hollowed-out design.
9. The strut device according to claim 7, characterized in that, The second retainer is sleeved on the internal threaded connection.
10. The strut device according to claim 1, characterized in that, The strut device further includes a second ball-and-socket connector, which is limitedly connected to the drive device. The drive device is located between the second ball-and-socket connector and the main shaft, and the first retainer is sleeved on the second ball-and-socket connector.
11. The strut device according to claim 1, characterized in that, The strut device also includes a coupling, which is connected between the output end of the drive device and the input end of the main shaft.
12. The strut device according to claim 11, characterized in that, The strut device also includes a damper, which is sleeved on the coupling, and the friction plate in the damper is connected to the coupling for transmission.
13. The strut device according to claim 12, characterized in that, The strut device further includes a seal, a bearing, and a mounting base. The mounting base is limited and connected to the damper. The bearing and the seal are disposed within the mounting base. The bearing is located between the damper and the seal. The edge of the seal is fitted and sealed with the internal structure of the mounting base. The input end of the spindle passes through the seal and the bearing, and the input end of the spindle is squeezed and sealed with the seal.
14. The strut device according to claim 13, characterized in that, The strut assembly also includes a sleeve, in which the drive unit, the damper, and the mounting base are housed.
15. The strut device according to claim 14, characterized in that, The strut device further includes a second ball-and-socket connector, which is inserted into the opening of the sleeve and laser-welded to the sleeve.
16. The strut device according to claim 15, characterized in that, The second ball socket connector includes a connected insertion connection portion and a limiting edge. The insertion connection portion is inserted into the opening of the sleeve. The first retainer includes a first sub-retainer and a second sub-retainer. The first sub-retainer and the second sub-retainer cover each other to fit over the limiting edge and a portion of the sleeve structure.
17. The strut device according to claim 1, characterized in that, The drive device includes a motor assembly and a gearbox assembly, which are connected in a transmission connection.
18. A vehicle door opening and closing system, characterized in that, include: Car tailgate; A strut device, one end of which is connected to the tailgate of the car, and the other end of which is connected to the body of the car; A balance spring, one end of which is connected to the tailgate of the car, and the other end of which is connected to the body of the car. The strut device is the strut device as described in any one of claims 1-17.
19. A vehicle, characterized in that, Including the door opening and closing system as described in claim 18.