Automatic sunshade curtain rewinding structure with buffering damping function

Abstract

An automatic sunshade curtain rewinding structure with buffer damping comprises a winding drum box and a mounting assembly, and the mounting assembly is used for mounting the winding drum box on an automobile window; a first end cover and a second end cover are installed at the two ends of the furling barrel box respectively, a roller shutter pipe is arranged in the furling barrel box, a shaft head is fixed to the inner side of the first end cover, and the two ends of the roller shutter pipe are installed on the shaft head of the first end cover and the second end cover respectively in a rotating mode. In conclusion, through the arrangement of the buffering damping assembly, small damping force is provided at the initial rewinding section of the sunshade curtain, the initial rewinding process is rapid and smooth, good user experience is guaranteed, the damping effect is gradually enhanced at the tail rewinding section, the phenomenon that a sunshade curtain batten collides with a winding drum box at a high speed is effectively restrained, and the safety of the sunshade curtain is improved. Damage and noise caused by violent collision of the structure are avoided, the service life of the product is remarkably prolonged, and meanwhile the silence and comfort of the riding environment are greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of automotive sunshade technology, specifically relating to an automatic rewind structure for a sunshade with buffer damping. Background Technology

[0002] In existing technologies, car sunshades generally use torsion springs as the core retraction power source. However, this structural design has the following drawbacks during use: When the torsion spring releases its stored energy to retract the sunshade, especially at the end of the retraction process, the retraction force is often too great and difficult to effectively buffer. This excessive retraction force directly acts on the storage box, causing the box structure to bear excessive impact stress. Under long-term use, this can easily lead to damage risks such as deformation and cracking of the box. At the same time, the end of the sunshade or the curtain collide violently with the internal structure of the box under high speed and high impact, inevitably generating unpleasant noise problems and affecting the driving experience. Utility Model Content

[0003] The present invention aims to provide an automatic rewind structure for sunshades with buffer damping, thereby solving the technical problems of stress damage and noise generation caused by excessive rewind force of existing car sunshades due to torsion spring structures.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] An automatic rewind structure for a sunshade with buffer damping includes a rewind box and an installation assembly. The installation assembly is used to install the rewind box on a car window. A first end cap and a second end cap are respectively installed at both ends of the rewind box. A roller shutter tube is provided inside the rewind box. A shaft head is fixed on the inner side of the first end cap. Both ends of the roller shutter tube are respectively mounted on the shaft head of the first end cap and the second end cap by rotation. A torsion spring is provided inside the roller shutter tube. One end of the torsion spring is fixedly connected to the end of the shaft head, and the other end of the torsion spring is connected to the roller shutter tube.

[0006] The second end cap is also provided with a buffer damping assembly, which acts on the end of the roller shutter tube; a sunshade is wound on the roller shutter tube, and the winding tube box has a slit hole in the axial direction. The end of the sunshade extends outward from the slit hole, and a strip is connected to the end of the sunshade. A hook handle is provided on the strip.

[0007] Furthermore, the inner wall of the roller shutter tube is internally splined, and a first external spline sleeve is fitted onto the shaft head of the first end cap. The first external spline sleeve can rotate relative to the shaft head. A second external spline sleeve is rotatably mounted on the second end cap. The two ends of the roller shutter tube are splinedly connected to the first external spline sleeve and the second external spline sleeve, respectively. A sliding sleeve that engages with the spline is provided inside the roller shutter tube. The sliding sleeve has an external spline, and the end of the torsion spring is connected to the sliding sleeve.

[0008] Furthermore, the buffer damping assembly includes a mounting cover and a reduction gear set. The mounting cover is used to assemble the reduction gear set onto the outside of the second end cover by a number of bolts. A first fixed shaft and a second fixed shaft are fixed to the outer side of the second end cover.

[0009] The reduction gear set includes a driving gear, a driven gear, and a double gear. The driving gear is connected to the second external splined sleeve hub. The double gear is rotatably mounted on the first fixed shaft and consists of a large gear and a small gear. The driven gear is rotatably mounted on the second fixed shaft.

[0010] In this configuration, the driving gear meshes with the large gear, and the small gear meshes with the driven gear. The radius of the driving gear is smaller than that of the large gear, and the radius of the small gear is smaller than that of the driven gear.

[0011] A spring is installed inside the assembly cover, and the spring acts on the driven gear.

[0012] Furthermore, the second end cap has an assembly hole, and a splined short tube is fixed to the end face of the second outer splined sleeve. The splined short tube is installed in the assembly hole and can rotate. The end of the drive gear is fixed with a splined shaft, and the splined shaft is splinedly engaged with the splined short tube.

[0013] Furthermore, the gear ratio between the driving gear and the large gear is 1:3, and the gear ratio between the small gear and the driven gear is 1:4.

[0014] Furthermore, the roller shutter tube is composed of an inner spline tube and a tapered reducing tube, with the tapered reducing tube being fitted and fixed to the outer wall of the inner spline tube.

[0015] Furthermore, the hook handle is hinged to the middle of the strip.

[0016] Furthermore, the mounting assembly includes an inner clamping shell and an outer clamping shell, with an mounting and clamping space formed between the inner and outer clamping shells, and several screws connecting the inner and outer clamping shells; the winding drum is fixedly mounted on the inner clamping shell.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] (1) This utility model is designed for the characteristic of the front window of a car being fan-shaped. It adopts a roller shutter tube design composed of an inner spline tube and a tapered variable diameter tube, so that the sunshade curtain forms a fan-shaped unfolding effect during the unfolding process, which fits the outline of the car window better and improves the sunshade effect and aesthetics. In addition, the hook handle is installed in the middle of the strip by hinge. When not in use, it can be rotated to a storage position parallel to the strip, which effectively avoids the risk of protrusion and bumping, and improves the convenience and safety of use.

[0019] (2) The present invention provides a small damping force in the initial stage of the sunshade curtain rewinding by setting a buffer damping assembly, so that the rewinding process is fast and smooth at the beginning stage, ensuring a good user experience. In the final stage of rewinding, the damping effect is gradually enhanced, effectively suppressing the phenomenon of the sunshade curtain strip hitting the rewind box at high speed, avoiding damage and noise caused by violent structural collisions. This not only significantly extends the service life of the product, but also greatly improves the quietness and comfort of the riding environment. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0021] Figure 1 This is an isometric view of an automatic rewinding structure for a sunshade curtain with buffer damping according to the present invention.

[0022] Figure 2 This is an isometric view from another perspective of the automatic rewinding structure of the sunshade curtain with buffer damping according to this utility model.

[0023] Figure 3 This is a schematic diagram of an automatic rewinding structure for a sunshade curtain with buffer damping after removing the outer shell.

[0024] Figure 4 A schematic diagram of an automatic retractable sunshade curtain with buffer damping after removing the mounting components;

[0025] Figure 5 This is a schematic diagram showing the connection between the roller shutter tube and the sunshade curtain.

[0026] Figure 6 This is a schematic diagram showing the installation of the buffer damping assembly on the second end cover.

[0027] Figure 7 Exploded view of the buffer damping assembly;

[0028] Figure 8 This is a schematic diagram of the roller shutter tube connection;

[0029] Figure 9 for Figure 8 Enlarged view at point K;

[0030] Figure 10 for Figure 8 Enlarged view of section J in the middle.

[0031] Reference numerals: 1. Winding box; 2. Mounting assembly; 3. First end cap; 4. Second end cap; 5. Roller blind tube; 6. Torsion spring; 7. Sunshade; 8. Slit hole; 9. Strip; 10. Hook handle; 12. First outer spline sleeve; 13. Second outer spline sleeve; 14. Sliding sleeve; 15. Shaft end; 16. Buffer damping assembly; 17. Assembly cover; 18. Reduction gear set; 19. First fixed shaft; 20. Second fixed shaft; 21. Driving gear; 22. Driven gear; 23. Double gear; 24. Large gear; 25. Small gear; 26. Spring; 27. Assembly hole; 28. Splined short tube; 29. ​​Splined shaft; 30. Internal spline tube; 31. Tapered reducer tube; 32. Inner clamp; 33. Outer clamp. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] The present invention will be further described in detail below with reference to the embodiments.

[0034] Specific embodiment 1 of the automatic rewinding structure of the sunshade curtain with buffer damping provided by this utility model:

[0035] like Figure 1-10 As shown, an automatic rewind structure for a sunshade with buffer damping includes a rewind box 1 and an installation component 2. The installation component 2 is used to install the rewind box 1 on a car window. A first end cover 3 and a second end cover 4 are respectively installed at both ends of the rewind box 1. A roller shutter tube 5 is provided inside the rewind box 1, and a shaft head 15 is fixed on the inner side of the first end cover 3.

[0036] The specific installation structure of the roller shutter tube 5 located inside the winding box 1 is as follows: the inner wall of the roller shutter tube 5 is an inner spline 30, and a first outer spline sleeve 12 is fitted on the shaft head 15 of the first end cover 3. The first outer spline sleeve 12 can rotate relative to the shaft head 15. An assembly round hole 27 is opened on the second end cover 4. A spline short tube 28 that can rotate around its axis is installed in the assembly round hole 27. The end of the spline short tube 28 is fixed with a second outer spline sleeve 13. The two ends of the roller shutter tube 5 are splinedly connected to the first outer spline sleeve 12 and the second outer spline sleeve 13 respectively, thereby realizing its rotatable support.

[0037] The roller shutter tube 5 is equipped with a torsion spring 6 and a sliding sleeve 14. The sliding sleeve 14 has an external spline and is engaged with the roller shutter tube 5 through the spline, so that it can rotate with the roller shutter tube 5 and slide along the axial direction at the same time. The torsion spring 6 is a helical spring. One end of the torsion spring 6 is fixedly connected to the shaft head 15, and the other end of the torsion spring 6 is connected to the sliding sleeve 14. The torsion spring 6 is used to provide the rewind torque after the sunshade curtain 7 is released.

[0038] The sunshade curtain 7 is wound around the roller shutter tube 5. The roller shutter box 1 has a slit hole 8 along the axial direction. The end of the sunshade curtain 7 extends outward from the slit hole 8. The end of the sunshade curtain 7 is connected to a strip 9. The strip 9 is provided with a hook handle 10 to facilitate the user to pull out and hang the sunshade curtain 7.

[0039] To mitigate the impact force at the end of the retraction of the sunshade 7, a buffer damping assembly 16 is also provided on the second end cover 4. The buffer damping assembly 16 acts on the end of the roller shutter tube 5. When the roller shutter tube 5 is about to retract into the retraction box 1, the buffer damping assembly 16 provides a reverse damping torque.

[0040] like Figure 6 and Figure 7 As shown, the buffer damping assembly 16 includes a mounting cover 17 and a reduction gear set 18. The mounting cover 17 is used to mount the reduction gear set 18 to the outside of the second end cover 4 by several bolts. The outer side of the second end cover 4 is fixed with a first fixed shaft 19 and a second fixed shaft 20.

[0041] The reduction gear set 18 includes a driving gear 21, a driven gear 22, and a double gear 23. The driving gear 21 is splinedly connected to the splined short tube 28 via a splined shaft 29 fixed at its end, and then linked with the second outer spline sleeve 13. The double gear 23 is rotatably mounted on the first fixed shaft 19 and is composed of a large gear 24 and a small gear 25. The driven gear 22 is rotatably mounted on the second fixed shaft 20.

[0042] In this structure, the driving gear 21 meshes with the large gear 24, and the small gear 25 meshes with the driven gear 22. The radius of the driving gear 21 is smaller than the radius of the large gear 24, and the radius of the small gear 25 is smaller than the radius of the driven gear 22, thus forming a two-stage reduction structure. Preferably, the gear ratio between the driving gear 21 and the large gear 24 is 1:3, and the gear ratio between the small gear 25 and the driven gear 22 is 1:4, thereby achieving a total reduction ratio of 1:12.

[0043] A spring 26 is installed inside the mounting cover 17. The spring 26 acts on the driven gear 22 to provide damping torque during the rewinding of the sunshade 7.

[0044] In this embodiment, the automatic rewinding structure of the sunshade with buffer damping is used by the user to install the rewind box 1 on the car window, such as the front windshield, through the installation component 2. At this time, the rewind box 1 is fixed to the B-pillar of the car. There is also a matching hanging ring (which can be installed on the A-pillar of the car). The hanging ring cooperates with the hook handle 10. When sunshade is needed, pull the hook handle 10 forward to pull the sunshade 7 out of the rewind box 1. The roller shutter tube 5 rotates and drives the torsion spring 6 to twist and deform. The torsion spring 6 pulls the sliding sleeve 14 to slide inside the roller shutter tube 5. The torsion spring 6 stores elastic potential energy to complete the unfolding of the sunshade 7. Finally, the hook handle 10 is hung on the hanging ring.

[0045] When the sunshade is no longer needed, the user releases the hook handle 10, the torsion spring 6 returns to its original deformation and releases its elastic potential energy, driving the roller shutter tube 5 to rotate rapidly. The roller shutter tube 5 winds around the sunshade curtain 7, causing the sunshade curtain 7 to quickly retract into the retractor box 1. During the retraction process, the roller shutter tube 5 drives the drive gear 21 to rotate through the second outer spline sleeve 13. The drive gear 21 meshes with the large gear 24 to achieve a 3-fold stroke reduction, that is, for every 3 rotations of the roller shutter tube 5, the large gear 24 rotates only 1 rotation, forming a first-level reduction effect. The large gear 24 rotates coaxially with the small gear 25, and the small gear 25 meshes with the driven gear 22 to further achieve a 4-fold stroke reduction, that is, for every 4 rotations of the small gear 25, the driven gear 22 rotates only 1 rotation, forming a second-level reduction.

[0046] Through these two-stage deceleration mechanisms, the original rapid rewinding motion is effectively transformed into a total stroke reduction process of 12 times, significantly reducing the rewinding speed at the end of the roller shutter tube 5. At the same time, the driven gear 22 presses the spring 26 during the deceleration transmission process. The spring 26 slowly tightens and stores energy, generating a large reverse torque when the sunshade 7 is almost fully retracted, forming an effective buffering and damping effect. This structure not only avoids the phenomenon of the strip 9 at the end of the sunshade 7 violently impacting the rewind tube box 1, reducing structural fatigue wear, but also significantly reduces noise, improving the overall vehicle's quietness and user comfort.

[0047] Through the above structural design, the automatic rewinding structure of the sunshade curtain in this embodiment has a significant progressive damping deceleration function: In the initial stage of rewinding the sunshade curtain 7, due to the large rewinding torque provided by the torsion spring 6, and the transmission ratio of the driven gear 22 connected to the mainspring 26 as high as 12:1 due to the two-stage reduction structure, that is, for every 12 rotations of the curtain tube 5, the driven gear 22 only rotates once. The winding speed of the mainspring 26 is slow and the return torque is small. Therefore, in the early stage of rewinding, it will hardly have a significant impact on the retraction of the sunshade curtain 7, so that the sunshade curtain 7 can be rewound quickly and efficiently, greatly improving the ease of use.

[0048] As the sunshade curtain 7 gradually approaches the fully retracted position, the roller shutter tube 5 continues to rotate, and the driving gear 21, large gear 24, small gear 25 and driven gear 22 continue to drive, and the mainspring 26 begins to tighten significantly, and the reverse torque it generates rises rapidly; at this time, the damping force generated by the mainspring 26 effectively restricts the roller shutter tube 5, significantly reducing the rewinding speed, and finally achieving deceleration and buffering at the end of the sunshade curtain 7.

[0049] This process exhibits excellent nonlinear response characteristics, namely, low damping in the initial stage and high damping in the final stage. This maintains the rapid rewinding experience in the initial stage while avoiding the risk of violent collision between the end strip 9 and the winding box 1 structure, significantly reducing noise and improving structural lifespan and ride comfort.

[0050] To prevent the hook handle 10 on the strip 9 from protruding and causing bumps or affecting the aesthetics when the sunshade 7 is not in use, the structure of the hook handle 10 can be optimized. Preferably, the hook handle 10 is installed in the middle of the strip 9 by a hinge, allowing it to rotate relative to the strip 9. When the sunshade 7 is not in use, the user can move the hook handle 10 to a position parallel to the strip 9, so that the hook handle 10 fits against the surface of the strip 9, preventing it from protruding outward, effectively reducing the risk of accidental collision and improving the safety and aesthetics of the overall structure.

[0051] Specific embodiment 2 of the automatic rewinding structure for a sunshade curtain with buffer damping provided by this utility model:

[0052] Based on the first specific implementation method, this embodiment further optimizes the structural design of the installation component 2 to improve the ease of installation and stability of the automatic sunshade retraction device in the car.

[0053] Specifically, such as Figure 2 As shown, the mounting assembly 2 includes an inner clamping shell 32 and an outer clamping shell 33, which form a mounting and clamping space. The inner clamping shell 32 and the outer clamping shell 33 are connected and fixed by several screws. The winding drum 1 is fixedly mounted on the inner clamping shell 32.

[0054] This embodiment is applicable to installing the sunshade structure inside the B-pillar of a car. The specific installation method is as follows: First, insert a part of the inner clip 32 into the gap inside the B-pillar of the car. Then, fasten the outer clip 33 onto the inner clip 32, so that the structure inside the B-pillar of the car is exactly in the installation clamping space between the two. Then, use screws to tighten the inner clip 32 and the outer clip 33. The clamping action between the two achieves a stable installation inside the B-pillar of the car.

[0055] This embodiment achieves glue-free installation through a mechanical clamping structure, which has the advantages of simple installation, convenient disassembly, and no damage to the original vehicle structure, further improving the product's compatibility and user experience.

[0056] Specific embodiment 3 of the automatic rewinding structure for a sunshade curtain with buffer damping provided by this utility model:

[0057] Given that car windshields are typically fan-shaped, this embodiment has adaptively optimized the structure of the roller shutter tube 5. Specifically, as follows: Figure 8-10 As shown, the roller shutter tube 5 consists of an inner spline tube 30 and a tapered reducing tube 31. The tapered reducing tube 31 is fitted and fixed to the outer wall of the inner spline tube 30, and the sunshade 7 is wrapped around the tapered reducing tube 31.

[0058] During the unfolding of the sunshade 7, the tapered reducing tube 31 gradually tapers from top to bottom, with a larger diameter at the top and a smaller diameter at the bottom. Therefore, the sunshade 7 is released faster in the upper region than in the lower region, causing the sunshade 7 to unfold in a fan shape, which can better fit the shape of the windshield and improve the sunshade effect and aesthetics.

[0059] It should be noted that, in this document, terms such as “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0060] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sunshade automatic rewinding structure with buffer damping, comprising a rewind box (1) and a mounting assembly (2), wherein the mounting assembly (2) is used to mount the rewind box (1) on a car window; a first end cap (3) and a second end cap (4) are respectively mounted on both ends of the rewind box (1), characterized in that: The inside of the roll-up box (1) is provided with a roll-up tube (5). The inner side of the first end cover (3) is fixed with a shaft head (15). The two ends of the roll-up tube (5) are respectively mounted on the shaft head (15) of the first end cover (3) and the second end cover (4) by rotation. A torsion spring (6) is provided inside the roll-up tube (5). One end of the torsion spring (6) is fixedly connected to the end of the shaft head (15), and the other end of the torsion spring (6) is connected to the roll-up tube (5). The second end cap (4) is also provided with a buffer damping assembly (16), which acts on the end of the roller shutter tube (5); a sunshade curtain (7) is wound on the roller shutter tube (5), and the winding tube box (1) has a slit hole (8) in the axial direction. The end of the sunshade curtain (7) extends outward from the slit hole (8), and the end of the sunshade curtain (7) is connected to a strip (9). A hook handle (10) is provided on the strip (9).

2. The automatic rewinding structure of a sunshade curtain with buffer damping according to claim 1, characterized in that: The inner wall of the roller shutter tube (5) is an internal spline. A first external spline sleeve (12) is fitted on the shaft head (15) of the first end cover (3). The first external spline sleeve (12) can rotate relative to the shaft head (15). A second external spline sleeve (13) is rotatably installed on the second end cover (4). The two ends of the roller shutter tube (5) are splinedly connected to the first external spline sleeve (12) and the second external spline sleeve (13) respectively. The roller shutter tube (5) is provided with a sliding sleeve (14) that cooperates with its spline. The sliding sleeve (14) has an external spline. The end of the torsion spring (6) is connected to the sliding sleeve (14).

3. The automatic rewinding structure of a sunshade curtain with buffer damping according to claim 2, characterized in that: The buffer damping assembly (16) includes a mounting cover (17) and a reduction gear set (18). The mounting cover (17) is used to mount the reduction gear set (18) to the outside of the second end cover (4) by several bolts. The outer side of the second end cover (4) is fixed with a first fixed shaft (19) and a second fixed shaft (20). The reduction gear set (18) includes a driving gear (21), a driven gear (22) and a double gear (23). The driving gear (21) is connected to the hub of the second external spline sleeve (13). The double gear (23) is rotatably mounted on the first fixed shaft (19). The double gear (23) is composed of a large gear (24) and a small gear (25). The driven gear (22) is rotatably mounted on the second fixed shaft (20). Among them, the driving gear (21) meshes with the large gear (24), the small gear (25) meshes with the driven gear (22), and the radius of the driving gear (21) is smaller than the radius of the large gear (24), and the radius of the small gear (25) is smaller than the radius of the driven gear (22). A spring (26) is installed on the inside of the mounting cover (17), and the spring (26) acts on the driven gear (22).

4. The automatic rewinding structure of a sunshade curtain with buffer damping according to claim 3, characterized in that: The second end cap (4) has an assembly hole (27), and the end face of the second outer spline sleeve (13) is fixed with a spline short tube (28). The spline short tube (28) is installed in the assembly hole (27) and can rotate. The end of the drive gear (21) is fixed with a spline shaft (29), and the spline shaft (29) is splinedly engaged with the spline short tube (28).

5. The automatic rewinding structure of a sunshade curtain with buffer damping according to claim 4, characterized in that: The gear ratio between the driving gear (21) and the large gear (24) is 1:3, and the gear ratio between the small gear (25) and the driven gear (22) is 1:

4.

6. The automatic rewinding structure of a sunshade curtain with buffer damping according to any one of claims 1-5, characterized in that: The roller shutter tube (5) is composed of an inner spline tube (30) and a tapered reducing tube (31), with the tapered reducing tube (31) fitted and fixed to the outer wall of the inner spline tube (30).

7. The automatic rewinding structure of a sunshade curtain with buffer damping according to claim 1, characterized in that: The hook handle (10) is mounted in the middle of the strip (9) by means of hinge.

8. The automatic rewinding structure of a sunshade curtain with buffer damping according to claim 1, characterized in that: The mounting assembly (2) includes an inner clamping shell (32) and an outer clamping shell (33), with an mounting clamping space formed between the inner clamping shell (32) and the outer clamping shell (33), and several screws connecting the inner clamping shell (32) and the outer clamping shell (33); the winding drum box (1) is fixedly mounted on the inner clamping shell (32).

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