Slide rail assembly and electric slide rail

Abstract

The utility model relates to the technical field of electric slide rails, and discloses a slide rail assembly and an electric slide rail, the slide rail assembly comprises a lower rail provided with a first screw rod and a second screw rod; the upper rail module comprises an upper rail and a reduction gearbox; the reduction gearbox comprises a box body, a driving worm, a first worm gear and a second worm gear; the first worm gear and the second worm gear are provided with a first threaded hole and a second threaded hole respectively, the thread turning directions are opposite, and the first threaded hole is arranged on the first lead screw in a sleeving mode. The second screw rod is sleeved with the second threaded hole; the driving worm is rotationally arranged on the box body and located between the first worm gear and the second worm gear. Power is input from the driving worm, the driving worm gear rotates to drive the first worm gear and the second worm gear to synchronously and reversely rotate, and the upper rail module slides along the first lead screw and the second lead screw. The sliding rail assembly has the advantages of being good in working stability, high in strength, light in weight, small in rail type section and good in dustproof effect.

Description

Technical Field

[0001] This utility model relates to the field of electric slide rail technology, and in particular to a slide rail assembly and an electric slide rail. Background Technology

[0002] Many car seats have electric sliding rails installed at the bottom for fore-and-aft adjustment. Screw-type electric sliding rails are widely used due to their stepless locking feature.

[0003] As car seat functions become more diverse, extended travel adjustments are becoming increasingly common, leading to higher demands on the strength of electric sliding rails. For example, some car seats integrate the seatbelt into the seat itself (ABTS seat) instead of being mounted on the vehicle body. To ensure passenger safety, the lead screw of the electric sliding rail generally needs to meet the requirements of Tr12. However, the increased lead screw size results in a corresponding increase in the size of the gearbox on the electric sliding rail, especially in the Z-axis direction, and the rail cross-section also becomes larger.

[0004] Dual-screw electric sliding rails can use two relatively small-gauge screws to meet high-strength requirements. For example, two Tr8 screws can meet the locking strength requirements of two ABTS car seats, while a single Tr14 screw would be needed to achieve the same locking strength. However, in existing electric long sliding rails, the rotation of the dual screws drives the reduction gearbox to slide along the two screws, thereby moving the car seat back and forth. Due to the large span of the screws, they are prone to bending in the middle, resulting in poor stability of the car seat during back and forth movement.

[0005] Furthermore, because the lower rail of the electric long slide rail is relatively long, the upper rail can slide along it. However, the upper rail is relatively short and cannot completely cover the lower rail. Therefore, foreign objects can easily enter the lower rail, causing problems such as noise, jamming, and even loss of slide rail function. Existing solutions generally use decorative strips or zippers on both sides of the lower rail to cover its opening. However, the covering effect is generally poor, the load-bearing capacity is low, and the assembly is cumbersome. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by this utility model is to propose a slide rail assembly and electric slide rail with good working stability, high strength and small rail cross section.

[0007] The technical solution adopted by this utility model to solve its technical problem is to propose a slide rail assembly, comprising:

[0008] The lower rail has a first lead screw and a second lead screw arranged in parallel and spaced apart along its length, and the threads of the first lead screw and the second lead screw have opposite directions.

[0009] An upper rail module is slidably mounted on the lower rail, the upper rail module including an upper rail and a reduction gearbox mounted on the upper rail;

[0010] The gearbox includes a housing, a driving worm gear, and a first worm wheel and a second worm wheel, both meshing with the driving worm gear. The first and second worm wheels are disposed within the housing and each has a first threaded hole and a second threaded hole, respectively. The threads of the first and second threaded holes have opposite directions. The first threaded hole is fitted onto the first lead screw and threadedly engages with it. The second threaded hole is fitted onto the second lead screw and threadedly engages with it. The driving worm gear is rotatably disposed within the housing and positioned between the first and second worm wheels. Power is input from the driving worm gear, and the rotation of the driving worm wheel drives the first and second worm wheels to rotate synchronously and in opposite directions. The upper rail module slides along the first and second lead screws.

[0011] Furthermore, both ends of the first lead screw and the second lead screw are provided with lead screw brackets. One end of the first lead screw and the second lead screw is fixed to the lower rail by one of the lead screw brackets, and the other end of the first lead screw and the second lead screw is fixed to the lower rail by another lead screw bracket.

[0012] When the upper rail module slides along the lower rail, the first lead screw and the second lead screw remain stationary.

[0013] Furthermore, a rubber bushing is fitted at both ends of both the first lead screw and the second lead screw, and the rubber bushing is located between the lead screw support and the first lead screw / second lead screw;

[0014] Both ends of the first lead screw and the second lead screw are fastened to the lead screw bracket by fastening nuts, and the fastening nuts compress the rubber bushing.

[0015] Furthermore, one or both ends of the upper rail are provided with a lead screw retainer, and both the first lead screw and the second lead screw pass through the lead screw retainer;

[0016] Several support springs extend upward, downward, and to both sides from the lead screw holder, and the support springs move against the inner wall of the lower rail.

[0017] Furthermore, the first worm gear and the second worm gear have the same direction of rotation for their worm gear teeth;

[0018] The active worm gear is made of metal, the first worm wheel and the second worm wheel are both made of plastic, and the first lead screw and the second lead screw are both made of metal.

[0019] Furthermore, one end of the first worm gear is provided with a first metal nut that is integrally or separately disposed with it, and the internal thread of the first metal nut is in the same direction as the internal thread of the first threaded hole; one end of the second worm gear is provided with a second metal nut that is integrally or separately disposed with it, and the internal thread of the second metal nut is in the same direction as the internal thread of the second threaded hole.

[0020] When the first worm gear and the first lead screw are normally engaged, the internal thread of the first metal nut does not contact the external thread of the first lead screw; when the second worm gear and the second lead screw are normally engaged, the internal thread of the second metal nut does not contact the external thread of the second lead screw.

[0021] When the first worm gear wears or the external load increases to a preset value, the first metal nut can engage with the first lead screw; when the second worm gear wears or the external load increases to a preset value, the second metal nut can engage with the second lead screw.

[0022] Furthermore, the lower rail has an upward opening along its length, a first pulley is provided at one end near the lower rail, and a second pulley is provided at the other end near the lower rail;

[0023] A shielding strip is connected to the upper rail module. One end of the shielding strip is connected to one end of the upper rail module, and the other end of the shielding strip passes around the first winding wheel and the second winding wheel and is connected to the other end of the upper rail module.

[0024] When the upper rail module slides along the lower rail, it drives the shielding strip, and the shielding strip always keeps the opening covered.

[0025] Furthermore, the two ends of the shielding strip are respectively connected to the upper rail module to form a closed-loop shielding structure; and the sum of the lengths of the shielding strip and the upper rail module is greater than or equal to twice the length of the opening, so that when the upper rail module slides to any position of the opening, the opening is always in a completely shielded state.

[0026] Furthermore, a guide groove is provided on each side of the lower rail near the opening, and a locking strip is provided on each side of the shielding strip, with the two locking strips respectively engaging in the two guide grooves;

[0027] The guide groove includes a snap-fit ​​section and a connecting section along its transverse direction. The connecting section is close to and communicates with the opening. The locking strip is movably snapped into the snap-fit ​​section, and the width of the locking strip is greater than the groove width of the connecting section.

[0028] This utility model also proposes an electric slide rail, comprising:

[0029] The aforementioned slide rail assembly;

[0030] A motor is mounted on the upper rail module, and the output shaft of the motor is connected to the driving worm gear.

[0031] Compared with the prior art, the present invention has at least the following beneficial effects:

[0032] In this invention, a first lead screw and a second lead screw are arranged parallel to each other on the lower rail. The upper rail module includes an upper rail and a reduction gearbox. The driving worm gear in the reduction gearbox is positioned between the first worm wheel and the second worm wheel. Through the engagement of the driving worm gear, the first worm wheel and the second worm wheel are driven to rotate simultaneously in opposite directions. The thread direction of the first threaded hole of the first worm wheel is opposite to that of the thread direction of the second threaded hole of the second worm wheel. Correspondingly, the external threads of the first lead screw and the second lead screw also have opposite directions. Therefore, the driving worm gear drives the first worm wheel and the second worm wheel to move in the same direction along the first lead screw and the second lead screw, that is, the reduction gearbox moves in the same direction and the upper rail module moves in the same direction. By using a double lead screw in conjunction with a reduction gearbox, the requirement of high locking strength can be achieved, while occupying little Z-axis space, having a small rail cross-section, and being lightweight. Power is input from the driving worm gear, which engages and drives the first worm wheel and the second worm wheel, while the first lead screw and the second lead screw do not need to move, which can effectively improve the working stability of the electric slide rail. The first lead screw and the second lead screw are not easily deformed or bent.

[0033] In this invention, each end of the first and second lead screws is provided with a lead screw bracket. One end of each lead screw is fixed to the lower rail via a lead screw bracket, and the other end is fixed to the lower rail via another lead screw bracket, ensuring reliable fixing of the first and second lead screws and convenient assembly and disassembly. A rubber bushing is fitted onto the end of each lead screw and secured with a fastening nut. This rubber bushing not only absorbs manufacturing and assembly tolerances but also isolates vibrations, ensuring the stability of the first and second lead screws.

[0034] In this invention, a lead screw retainer is configured at each end of the upper rail. The first lead screw and the second lead screw pass through the lead screw retainer, which supports the two lead screws. The lead screw retainer extends upward, downward, and to both sides with several support springs. Each support spring supports the inner wall of the lower rail, further strengthening the strength of the first and second lead screws. Because the span of the first and second lead screws in the long slide rail is large, the lead screw retainer can provide good support for the two lead screws and prevent them from bending in the middle.

[0035] In this invention, the first and second lead screws are made of metal, the driving worm gear is made of metal, and the first and second worm wheels are made of plastic. This ensures that during transmission, each meshing stage involves metal and plastic, avoiding transmission friction noise and absorbing vibration. Furthermore, a first metal nut is provided at one end of the first worm wheel, and a second metal nut is provided at one end of the second worm wheel. Under normal circumstances, the first metal nut does not contact the first lead screw, and the second metal nut does not contact the second lead screw. Only when the first and second worm wheels wear or the external load increases will the first metal nut mesh with the first lead screw, and the second metal nut mesh with the second lead screw, providing strength assurance.

[0036] In this invention, a first winding wheel is provided at one end near the lower rail, and a second winding wheel is provided at the other end near the lower rail. A shielding strip is provided on the upper rail module. One end of the shielding strip is connected to the upper rail module, and the other end passes around the first winding wheel and the second winding wheel in sequence before connecting to the upper rail module, forming a closed-loop shielding structure. When the upper rail module slides along the opening, it drives the shielding strip to move, and the shielding strip always keeps the opening covered. This can effectively prevent foreign objects from entering the lower rail through the opening and affecting the normal operation of the slide rail, ensuring good safety of the slide rail, high aesthetics, and simpler manufacturing and assembly processes.

[0037] In this invention, a guide groove is symmetrically arranged on both sides of the lower rail near the opening. A retaining strip is provided on each side of the shielding strip, and the two retaining strips are respectively engaged in the two guide grooves to ensure sufficient shielding size of the shielding strip in the width direction of the opening, keeping the opening always shielded. The guide groove includes a retaining section and a connecting section near the opening. The width of the retaining strips on both sides of the shielding strip is greater than the width of the groove at the connecting end, preventing the retaining strips from detaching from the guide groove and ensuring the stability of the shielding structure. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the slide rail assembly of this utility model;

[0039] Figure 2 for Figure 1 A schematic diagram of the structure after removing the lower rail;

[0040] Figure 3 for Figure 1 Exploded view;

[0041] Figure 4 This is a schematic diagram of the main structure of the track.

[0042] Figure 5 for Figure 4 The front view;

[0043] Figure 6 This is a schematic diagram of the screw cage structure;

[0044] Figure 7 This is a schematic diagram of the assembly of the lead screw retainer and the lower rail;

[0045] Figure 8 A schematic diagram of another implementation of the track body;

[0046] Figure 9 for Figure 8 The front view;

[0047] Figure 10 This is a schematic diagram of the upper rail structure;

[0048] Figure 11 for Figure 10 A structural diagram from another perspective;

[0049] Figure 12 This is the front view of the top rail;

[0050] Figure 13 This is an assembly drawing of the gearbox with the first and second lead screws;

[0051] Figure 14 for Figure 13 A schematic diagram of the structure after removing the top shell of the box;

[0052] Figure 15 This is an exploded view of the gearbox;

[0053] Figure 16 This is an assembly diagram of the upper rail module, the shielding strip, and the first and second winding pulleys;

[0054] Figure 17 for Figure 16 A plan view;

[0055] Figure 18 This is a schematic diagram showing the disassembled shielding strip and the lower rail.

[0056] In the picture:

[0057] 1. Lower rail; 10. Rail body; 11. First winding pulley; 12. Second winding pulley; 13. End cap; 14. Guide groove; 100. Opening; 140. Snap-fit ​​section; 141. Connecting section; 15. Fixing base;

[0058] 2. First lead screw; 230. Lead screw bracket; 231. Rubber bushing; 232. Fastening nut; 233. Lead screw retainer; 233A. Support spring;

[0059] 3. Second lead screw;

[0060] 4. Upper rail module; 40. Upper rail; 41. Gearbox; 401. Roller; 410. Housing; 411. Driving worm gear; 411A. Slot; 412. First worm wheel; 412A. First threaded hole; 413. Second worm wheel; 413A. Second threaded hole; 414. First metal nut; 415. Second metal nut; 416. Rubber washer; 417. Plastic bushing; 418. Metal washer;

[0061] 5. Shielding strip; 50. Clip; 51. Buckle. Detailed Implementation

[0062] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0063] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment 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 indicator will also change accordingly.

[0064] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" 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. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0065] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0066] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0067] like Figures 1-5 as well as Figures 13-15As shown, a slide rail assembly in this embodiment mainly includes: a lower rail 1, a first lead screw 2, a second lead screw 3, an upper rail module 4, and a shielding strip 5;

[0068] The upper rail module 4 mainly includes an upper rail 40 and a gearbox 41;

[0069] The gearbox 41 mainly includes: a housing 410, a drive worm gear 411, a first worm wheel 412, a second worm wheel 413, a rubber washer 416, a plastic bushing 417, and a metal washer 418.

[0070] The lower rail 1 is provided with a first lead screw 2 and a second lead screw 3 arranged in parallel and spaced apart along its length, and the threads of the first lead screw 2 and the second lead screw 3 have opposite directions. The upper rail module 4 is slidably disposed on the lower rail 1, and the upper rail module 4 includes an upper rail 40 and a reduction gearbox 41 disposed on the upper rail 40.

[0071] The gearbox 41 includes a housing 410, a driving worm gear 411, and a first worm wheel 412 and a second worm wheel 413, both meshing with the driving worm gear 411. The first worm wheel 412 and the second worm wheel 413 are both disposed within the housing 410 and are respectively provided with a first threaded hole 412A and a second threaded hole 413A. The threads of the first threaded hole 412A and the second threaded hole 413A have opposite directions. The first threaded hole 412A is fitted onto the first lead screw 2 and threadedly engages with it. The second threaded hole 413A is fitted onto the second lead screw 3 and threadedly engages with it. The driving worm gear 411 is rotatably disposed within the housing 410 and is located between the first worm wheel 412 and the second worm wheel 413. Power is input from the driving worm gear 411, and the rotation of the driving worm wheel drives the first worm wheel 412 and the second worm wheel 413 to rotate synchronously and in opposite directions. The upper rail module 4 slides along the first lead screw 2 and the second lead screw 3. The first threaded hole 412A of the first worm gear 412 and the second threaded hole 413A of the second worm gear 413 respectively mesh with the first lead screw 2 and the second lead screw 3 to realize the motion transmission and locking functions.

[0072] In practical use, in this embodiment, the first lead screw 2 and the second lead screw 3 are arranged in parallel on the lower rail 1. The upper rail module 4 includes an upper rail 40 and a reduction gearbox 41. The driving worm gear 411 in the reduction gearbox 41 is disposed between the first worm wheel 412 and the second worm wheel 413. Through the engagement of the driving worm gear 411, the first worm wheel 412 and the second worm wheel 413 are driven to rotate in opposite directions simultaneously. The thread direction of the first threaded hole 412A of the first worm wheel 412 is opposite to the thread direction of the second threaded hole 413A of the second worm wheel 413. Correspondingly, the external thread directions of the first lead screw 2 and the second lead screw 3 are also opposite. Therefore, the driving worm gear 411 will drive the first worm wheel 412 and the second worm wheel 413 to move in the same direction along the first lead screw 2 and the second lead screw 3, that is, the reduction gearbox 41 moves in the same direction and the upper rail module 4 moves in the same direction.

[0073] In this embodiment, the high locking strength requirement can be achieved by using the first lead screw 2 and the second lead screw 3 (i.e., double lead screws) in conjunction with the reduction gearbox 41, while also occupying a small Z-axis space, having a small rail cross-section, and being lightweight. Power is input from the driving worm gear 411, which meshes with the first worm wheel 412 and the second worm wheel 413, while the first lead screw 2 and the second lead screw 3 do not need to move, which can effectively improve the working stability of the electric slide rail, and the first lead screw 2 and the second lead screw 3 are not easily deformed or bent.

[0074] like Figures 2-3 as well as Figures 6-7 As shown, both ends of the first lead screw 2 and the second lead screw 3 are provided with lead screw supports 230. One end of the first lead screw 2 and the second lead screw 3 is fixed to the lower rail 1 through one of the lead screw supports 230, and the other end of the first lead screw 2 and the second lead screw 3 is fixed to the lower rail 1 through another lead screw support 230. That is, this embodiment provides two lead screw supports 230. One end of the two lead screws (i.e., the first lead screw 2 and the second lead screw 3) is fixed to the lower rail 1 through one lead screw support 230, and the other end of the two lead screws (i.e., the first lead screw 2 and the second lead screw 3) is fixed to the lower rail 1 through another lead screw support 230, ensuring that the two lead screws (i.e., the first lead screw 2 and the second lead screw 3) are reliably fixed.

[0075] In actual use, when the upper rail module 4 slides along the lower rail 1, the first lead screw 2 and the second lead screw 3 do not rotate, that is, the first lead screw 2 and the second lead screw 3 do not need to move, which can effectively improve their working stability. The first lead screw 2 and the second lead screw 3 are not easily deformed or bent from both ends to the middle.

[0076] Furthermore, a rubber bushing 231 is fitted at both ends of the first lead screw 2 and the second lead screw 3, and the rubber bushing 231 is positioned between the lead screw support 230 and the first lead screw 2 / second lead screw 3. Specifically, a rubber bushing 231 is fitted at each end of the first lead screw 2, and a rubber bushing 231 is also fitted at each end of the second lead screw 3, for a total of four rubber bushings 231, each with a boss. Both ends of the first lead screw 2 and the second lead screw 3 are fastened to the lead screw support 230 by fastening nuts 232, and the fastening nuts 232 compress the rubber bushings 231, specifically by compressing the bosses of the rubber bushings 231, ensuring that the first lead screw 2 and the second lead screw 3 do not shift on the lead screw support 230.

[0077] In actual use, a lead screw bracket 230 is provided at both ends of the first lead screw 2 and the second lead screw 3. One end of the first lead screw 2 and the second lead screw 3 is fixed to the lower rail 1 by the lead screw bracket 230, and the other end of the two is fixed to the lower rail 1 by another lead screw bracket 230, so as to ensure that the first lead screw 2 and the second lead screw 3 are reliably fixed and easy to disassemble and assemble.

[0078] A rubber bushing 231 is fitted onto the ends of both lead screws and fixed by a fastening nut 232. The rubber bushing 231 can not only absorb manufacturing and assembly tolerances, but also isolate vibrations, ensuring the stability of the first lead screw 2 and the second lead screw 3.

[0079] A lead screw retainer 233 is provided at one or both ends of the upper rail 40. Preferably, a lead screw retainer 233 is provided at each end of the upper rail 40, and the lead screw retainer 233 is detachably snapped and fixed to the upper rail 40. Both the first lead screw 2 and the second lead screw 3 are passed through the lead screw retainer 233.

[0080] Several support springs 233A extend upward, downward, and to the left and right sides from the lead screw retainer 233. The support springs 233A are roughly semi-circular and can undergo elastic deformation. The support springs 233A move against the inner wall of the lower rail 1. The upwardly extending support springs 233A abut against the inner wall of the top of the lower rail 1, the downwardly extending support springs 233A abut against the inner wall of the bottom of the lower rail 1, and the side-extending support springs 233A abut against the inner walls of the left and right sides of the lower rail 1, respectively, to ensure support in all directions (up, down, left, right) and absorb vibrations in all directions (up, down, left, right).

[0081] In actual use, this embodiment has a lead screw retainer 233 at each end of the upper rail 40. The first lead screw 2 and the second lead screw 3 are inserted into the lead screw retainer 233. The lead screw retainer 233 supports the two lead screws, and the lead screw retainer 233 extends upward, downward and to both sides with a number of support springs 233A. Each support spring 233A is supported on the inner wall of the lower rail 1, further strengthening the strength of the first lead screw 2 and the second lead screw 3. Because the span of the first lead screw 2 and the second lead screw 3 in the long slide rail is large, the lead screw retainer 233 can provide good support for the two lead screws and prevent them from bending in the middle.

[0082] like Figures 10-12 As shown, in this embodiment, the upper rail module 40 is designed as a closed system, resulting in better overall strength. When adapting to different vehicle models, only the welded bracket needs to be adjusted. Multiple rollers 401 are provided at both the top and bottom of the upper rail 40, respectively abutting against the top and bottom surfaces of the lower rail 1. This transforms the sliding friction of the upper rail module 4 into rolling friction, reducing frictional resistance and ensuring smooth movement of the upper rail module 4.

[0083] On the one hand, the upper rail module 4 in this embodiment can be applied to, for example... Figures 4-5 The track body 10 shown is the optimal configuration of the track body 10 of the lower track 1 in this embodiment. The track body 10 is made of aluminum alloy.

[0084] Of course, on the other hand, the upper rail module 4 of this embodiment can also be applied to, for example... Figures 8-9 The track body 10 shown is made of stainless steel. When an aluminum alloy track body 10 is used, it is fixed to the vehicle body via bolt holes in the center. When a stainless steel track body 10 is used, multiple mounting brackets 15 are added to the outside of the track body 10 to fix it to the vehicle body.

[0085] like Figures 13-15 As shown, in this embodiment, the active worm gear 411 is rotatably disposed on the housing 410 and is located between the first worm wheel 412 and the second worm wheel 413. That is, the first worm wheel 412 and the second worm wheel 413 are located on opposite sides of the active worm gear 411. During use, power is input from the active worm gear 411, and the rotation of the active worm wheel drives the first worm wheel 412 and the second worm wheel 413 to rotate synchronously and in opposite directions. The upper rail module 4 slides along the first lead screw 2 and the second lead screw 3.

[0086] When the slide rail assembly is applied to a car seat, the car seat is mounted on the upper rail module 4. The slide rail assembly can drive the car seat to move back and forth inside the vehicle. A power component, such as a motor, drives the active worm gear 411 to rotate. The active worm gear 411 simultaneously meshes with the first worm wheel 412 and the second worm wheel 413, causing the first worm wheel 412 and the second worm wheel 413 to rotate synchronously in opposite directions, i.e., one rotates counterclockwise and the other rotates clockwise. Since the external threads of the first lead screw 2 and the second lead screw 3 have opposite directions, and correspondingly, the internal threads of the first threaded hole 412A on the first worm wheel 412 and the second threaded hole 413A on the second worm wheel 413 have opposite directions, the first worm wheel 412 and the second worm wheel 413 will move in the same direction along the first lead screw 2 and the second lead screw 3, thereby causing the car seat to move back and forth.

[0087] In practical use, the high locking strength requirement can be achieved by using a double lead screw in conjunction with a reduction gearbox 41, while also occupying little Z-axis space, having a small rail cross-section, and being lightweight. Power is input from the driving worm gear 411, which meshes with the first worm wheel 412 and the second worm wheel 413, while the first lead screw 2 and the second lead screw 3 do not need to move, which can effectively improve the working stability of the electric slide rail, and the first lead screw 2 and the second lead screw 3 are not easily deformed or bent.

[0088] Since the first worm gear 412 and the second worm gear 413 mesh with the same driving worm 411, the worm gear teeth of the first worm gear 412 and the second worm gear 413 in this embodiment have the same helix direction. Furthermore, the driving worm 411 is perpendicular to the first worm gear 412 and the second worm gear 413, and one end of the driving worm 411 is provided with a slot 411A for connecting a power component (such as the output shaft of a motor). This slot 411A is a rectangular slot or a directional slot, so that the output shaft of the motor can rotate, driving the driving worm 411 to rotate and transmit torque.

[0089] Specifically, in this embodiment, the driving worm gear 411 is made of metal, while the first worm wheel 412 and the second worm wheel 413 are both made of plastic. Therefore, the metal driving worm gear 411 meshes with the plastic first worm wheel 412 and the plastic second worm wheel 413. The first lead screw 2 and the second lead screw 3 are both made of metal. Therefore, the plastic first worm wheel 412 meshes with the metal first lead screw 2, and the plastic second worm wheel 413 meshes with the metal second lead screw 3. In actual use, ensuring that each meshing stage involves both metal and plastic avoids transmission friction noise and absorbs vibration.

[0090] More specifically, in this embodiment, one end of the first worm gear 412 is provided with a first metal nut 414, which is integrally or separately disposed with it. The internal thread direction of the first metal nut 414 is the same as the internal thread direction of the first threaded hole 412A. One end of the second worm gear 413 is provided with a second metal nut 415, which is integrally or separately disposed with it. The internal thread direction of the second metal nut 415 is the same as the internal thread direction of the second threaded hole 413A. Preferably, the first metal nut 414 is integrally injection molded with the first worm gear 412, and the second metal nut 415 is preferably integrally injection molded with the second worm gear 413.

[0091] In actual use, when the first worm gear 412 is normally engaged with the first lead screw 2, the internal thread of the first metal nut 414 does not contact the external thread of the first lead screw 2. When the second worm gear 413 is normally engaged with the second lead screw 3, the internal thread of the second metal nut 415 does not contact the external thread of the second lead screw 3. When the first worm gear 412 wears or the external load increases to a preset value, the first metal nut 414 can engage with the first lead screw 2. When the second worm gear 413 wears or the external load increases to a preset value, the second metal nut 415 can engage with the second lead screw 3. Specifically, this preset value can be selected according to actual needs.

[0092] In this embodiment, the internal thread profile of the first metal nut 414 is identical to that of the internal thread profile of the first threaded hole 412A of the first worm gear 412, except that the thread profile is thinner. Similarly, the internal thread profile of the second metal nut 415 is identical to that of the internal thread profile of the second threaded hole 413A of the second worm gear 413, except that the thread profile is thinner. Therefore, under normal circumstances, the first metal nut 414 does not contact the first lead screw 2, and the second metal nut 415 does not contact the second lead screw 3. Only when the first worm gear 412 and the second worm gear 413 are worn or the external load increases, will the first metal nut 414 engage with the first lead screw 2, and the second metal nut 415 engage with the second lead screw 3 to ensure strength. That is, only when higher strength is required, and the plastic tooth profiles of the first worm gear 412 and the second worm gear 413 are deformed, will the first metal nut 414 and the second metal nut 415 participate in ensuring strength.

[0093] In this embodiment, the housing 410 is provided with a first mounting cavity (not shown in the figure) and a second mounting cavity (not shown in the figure). For ease of assembly, the housing 410 includes an upper shell and a lower shell, which are detachably fixed together by bolts. A first worm gear 412 and a second worm gear 413 are respectively installed in the first mounting cavity and the second mounting cavity. The length (L1) of the first mounting cavity along the axial direction of the first worm gear 412 is greater than the length (L2) of the second mounting cavity along the axial direction of the second worm gear 413; or the length (L1) of the first mounting cavity along the axial direction of the first worm gear 412 is less than the length (L2) of the second mounting cavity along the axial direction of the second worm gear 413. In other words, the lengths of the first mounting cavity and the second mounting cavity are different, for example, one is 0.5 mm longer than the other. In actual assembly, the lengths of the first mounting cavity and the second mounting cavity are unequal, one is larger and the other smaller. After the gearbox 41 is assembled, the first worm gear 412 and the second worm gear 413 are fitted tightly and loosely (i.e., axially floating) to avoid jamming.

[0094] Furthermore, a rubber washer 416 is provided at one end of both the first worm gear 412 and the second worm gear 413. When the first worm gear 412 and the second worm gear 413 are installed in the housing 410, the rubber washer 416 on each of them can be compressed. During assembly, the rubber washer 416 can be compressed, and after assembly, the rubber washer 416 can be tightened again to ensure convenient assembly. A metal washer 418 is provided on the outside of the rubber washer 416 to press the rubber washer 416 tightly. In addition, plastic bushings 417 are provided at both ends of the driving worm 411, both ends of the first worm gear 412, and both ends of the second worm gear 413, and each is assembled to the housing 410 through the plastic bushings 417. After the plastic bushings 417 are worn, they are easy to replace. The bushings at both ends of the driving worm 411, both ends of the first worm gear 412, and both ends of the second worm gear 413 are all provided with plastic bushings 417.

[0095] During operation, the motor drives the drive worm gear 411 to rotate. The drive worm gear 411 meshes with the first worm wheel 412 and the second worm wheel 413, causing the first worm wheel 412 and the second worm wheel 413 to rotate synchronously in opposite directions. The first worm wheel 412 and the second worm wheel 413 mesh with the first lead screw 2 and the second lead screw 3 respectively, moving in the same direction along the first lead screw 2 and the second lead screw 3, thus causing the gearbox 41 to move along the first lead screw 2 and the second lead screw 3. When the motor reverses, the gearbox 41 moves in the opposite direction.

[0096] In this embodiment, the slide rail assembly has high strength, good stability, light weight, and small rail cross-section.

[0097] like Figures 16-17 and combined Figures 1-5As shown, in this embodiment, the lower rail 1 has an upward-facing opening 100 along its length direction. This opening 100 is provided because the upper rail module 4 needs to slide along the length direction of the lower rail 1. A first winding wheel 11 is provided near one end of the lower rail 1, and a second winding wheel 12 is provided near the other end of the lower rail 1. The first winding wheel 11 and the second winding wheel 12 are used for the shielding belt 5 to be wound, which facilitates the reversal of the shielding belt 5.

[0098] A shielding strip 5 is connected to the upper rail module 4. One end of the shielding strip 5 is connected to one end of the upper rail module 4, and the other end of the shielding strip 5 passes around the first winding wheel 11 and the second winding wheel 12 and is connected to the other end of the upper rail module 4.

[0099] When the upper rail module 4 of this embodiment slides along the lower rail 1, it drives the shielding strip 5, and the shielding strip 5 always keeps the opening 100 covered.

[0100] In this embodiment, the two ends of the shielding strip 5 are respectively connected to the upper rail module 4, forming a closed-loop shielding structure. Furthermore, the sum of the lengths of the shielding strip 5 and the upper rail module 4 is greater than or equal to twice the length of the opening 100, so that when the upper rail module 4 slides to any position of the opening 100, the opening 100 is always in a completely shielded state.

[0101] Specifically, a buckle 51 is provided at each end of the shielding strip 5, and both ends of the shielding strip 5 are respectively engaged with the upper rail module 4 through the buckles 51. More specifically, one end of the shielding strip 5 is detachably fixed to the upper rail module 4 through one buckle 51, and the other end of the shielding strip 5 is detachably fixed to the upper rail module 4 through another buckle 51, ensuring that the shielding strip 5 is easy to replace and disassemble. The shielding strip 5 in this embodiment includes a base material and a reinforcing material, wherein the base material is rubber, polyurethane, or silicone, and the reinforcing material is fiberglass, nylon, or steel wire. The base material slides in contact with the metal lower rail 1, reducing or even avoiding sliding noise, while the reinforcing material effectively increases the strength of the shielding strip 5. The shielding strip 5 in this embodiment is easy to manufacture and process, and has higher strength than zippers and fabrics.

[0102] In actual use, the slide rail structure of this embodiment has a first winding wheel 11 at one end near the lower rail 1 and a second winding wheel 12 at the other end near the lower rail 1. One end of the shielding strip 5 is connected to the upper rail module 4, and the other end passes around the first winding wheel 11 and the second winding wheel 12 in sequence before connecting to the upper rail module 4, forming a closed-loop shielding structure. When the upper rail module 4 slides along the opening 100, it drives the shielding strip 5 to move, and the shielding strip 5 always keeps the opening 100 covered. This can effectively prevent foreign objects from entering the lower rail 1 from the opening 100, thereby affecting the normal operation of the slide rail, ensuring good safety and high aesthetics of the slide rail.

[0103] In existing zipper-type concealing structures, one zipper strip is fixed to a decorative strip, and another strip is fixed to another decorative strip. The zipper head is connected to the upper rail 40. When the upper rail 40 slides along the lower rail 1, the two strips are engaged by the zipper head, and the two decorative strips conceal the opening 100. This zipper-type concealing structure has two drawbacks: firstly, the zipper has weak load-bearing capacity and is easily damaged during use, posing a safety hazard; secondly, the process of fixing the zipper strips to the decorative strips is complex, and the assembly process of the zipper is also complicated.

[0104] Compared to the zipper-type shielding structure, in the slide rail structure of this embodiment, the two ends of the shielding strip 5 are respectively connected to the upper rail module 4 to form a closed-loop shielding structure, and the two sides of the shielding strip 5 are respectively movably engaged with the lower rail 1, which has a stronger load-bearing capacity and a simpler manufacturing and assembly process.

[0105] Specifically, in this embodiment, the distance between the first winding wheel 11 and the second winding wheel 12 is greater than or equal to the length of the opening 100, ensuring that the span of the shielding belt 5 is large enough to cover the length of the opening 100.

[0106] like Figures 16-18 As shown, in this embodiment, the lower rail 1 is provided with a guide groove 14 on each side near the opening 100, and the shielding strip 5 is provided with a retaining strip 50 on each side, with the two retaining strips 50 respectively engaging in the two guide grooves 14. The guide groove 14 includes a retaining section 140 and a connecting section 141 along its transverse direction. The connecting section 141 is near the opening 100 and communicates with the opening 100. The retaining strip 50 is movably engaged in the retaining section 140, and the width of the retaining strip 50 is greater than the width of the groove in the connecting section 141.

[0107] In actual use, the distance between the first winding pulley 11 and the second winding pulley 12 is greater than or equal to the length of the opening 100, ensuring that the shielding size of the shielding strip 5 in the length direction of the opening 100 is sufficient. Guide grooves 14 are provided on both sides of the opening 100 of the lower rail 1, and the locking strips 50 on both sides of the shielding strip 5 are movably engaged in the guide grooves 14, ensuring that the shielding size of the shielding strip 5 in the width direction of the opening 100 is sufficient, and ensuring that the opening 100 is always in a completely shielded state.

[0108] In this embodiment, the lower rail 1 includes a rail body 10 and two end caps 13 respectively connected to both ends of the rail body 10. The end caps 13 are made of plastic, while the rail body 10 is made of metal. One end cap 13 is snapped onto one end of the rail body 10, and the other end cap 13 is snapped onto the other end of the rail body 10. The first winding pulley 11 is mounted on one end cap 13, and the second winding pulley 12 is mounted on the other end cap 13, ensuring convenient assembly of the first and second winding pulleys 11 and 12. Furthermore, the first winding pulley 11 and the second winding pulley 12 are configured as fixed pulleys, meaning that their positions remain fixed during use.

[0109] In the shielding structure of the lower rail 1 opening 100 of this solution, a first winding wheel 11 and a second winding wheel 12 are respectively set at both ends near the lower rail 1. One end of the shielding belt 5 is connected to the upper rail module 4, and the other end passes around the first winding wheel 11 and the second winding wheel 12 in sequence and is connected to the upper rail module 4 to form a closed-loop shielding structure, which fully shields the opening 100 of the lower rail 1, effectively blocking foreign objects and preventing them from entering the lower rail 1. It has a large load-bearing capacity, good visual effect, high aesthetics, and is easy to process and assemble.

[0110] During operation, the power component (such as a motor) drives the active worm gear 411 to rotate. The active worm gear 411 simultaneously engages the first worm wheel 412 and the second worm wheel 413. The first worm wheel 412 and the second worm wheel 413 rotate simultaneously and in opposite directions. The first worm wheel 412 engages with the first lead screw 2, and the second worm wheel 413 engages with the second lead screw 3. Since the first lead screw 2 and the second lead screw 3 remain stationary, the first worm wheel 412 and the second worm wheel 413 slide along the first lead screw 2 and the second lead screw 3 in the same direction, causing the gearbox 41 to slide along the two lead screws. The upper rail module 4 slides along the opening 100 of the lower rail 1. During the sliding process, the closed-loop shielding structure formed by the shielding belt 5 and the upper rail module 4 always shields the opening 100 of the lower rail 1.

[0111] Conversely, when a power component (such as a motor) drives the active worm gear 411 to rotate in the opposite direction, the upper rail module 4 slides in the opposite direction along the opening 100 of the lower rail 1.

[0112] As the upper rail module 4 slides along the lower rail 1, the screw retainers 233 at both ends of the upper rail module 4 are fixedly engaged with it. As the upper rail module 4 slides, the first screw 2 and the second screw 3 are always supported by the screw retainers 233, ensuring their rigidity and strength. Because the first screw 2 and the second screw 3 are very long and have a large span in the long slide rail, the screw retainers provide central support for the first screw 2 and the second screw 3, preventing them from easily bending or deforming in the middle. The upward-extending support springs 233A, the downward-extending support springs 233A, and the support springs 233A extending to both sides of the screw retainer 233 are movably abutted against the inner wall of the lower rail 1, ensuring support in all directions and absorbing vibrations from all directions.

[0113] When the slide rail assembly of this embodiment is included in the electric slide rail, the electric slide rail includes: the slide rail assembly of this embodiment and the motor, the motor is disposed on the upper rail module 4, and the output shaft of the motor is connected to the driving worm gear 411.

[0114] This electric long slide rail has at least the following characteristics:

[0115] The electric long slide rail enables large-travel adjustment of the car seat. The lower slide rail is installed on the car floor, and the upper rail module 4 can move within the lower rail 1 along the extension direction of the lower rail 1.

[0116] The upper rail module 4 is assembled into the inner cavity of the lower rail 1 and is supported on the inner wall of the lower rail 1 by multiple rollers 401. It is tightened with the inner cavity of the lower rail 1, which can eliminate the gap between the upper rail module 4 and the lower rail 1 and provide stability for the car seat.

[0117] A reduction gearbox 41 is arranged in the middle of the upper rail module 4. The output nuts of the reduction gearbox 41, namely the first worm gear 412 and the second worm gear 413, are threadedly engaged with the first lead screw 2 and the second lead screw 3 installed in the lower rail 1 to realize motion transmission and locking functions. The first lead screw 2 and the second lead screw 3 are fixed to the lower rail 1. During the operation, the first lead screw 2 and the second lead screw 3 do not need to move.

[0118] In this solution, the slide rail assembly has good working stability, high strength, light weight, small rail cross-section, and good dustproof effect.

Claims

1. A slide rail assembly, characterized in that, include: The lower rail has a first lead screw and a second lead screw arranged in parallel and spaced apart along its length, and the threads of the first lead screw and the second lead screw have opposite directions. An upper rail module is slidably mounted on the lower rail, the upper rail module including an upper rail and a reduction gearbox mounted on the upper rail; The gearbox includes a housing, a driving worm gear, and a first worm wheel and a second worm wheel, both meshing with the driving worm gear. The first and second worm wheels are disposed within the housing and each has a first threaded hole and a second threaded hole, respectively. The threads of the first and second threaded holes have opposite directions. The first threaded hole is fitted onto the first lead screw and threadedly engages with it. The second threaded hole is fitted onto the second lead screw and threadedly engages with it. The driving worm gear is rotatably disposed within the housing and positioned between the first and second worm wheels. Power is input from the driving worm gear, and its rotation drives the first and second worm wheels to rotate synchronously and in opposite directions. The upper rail module slides along the first and second lead screws.

2. The slide rail assembly according to claim 1, characterized in that, Both ends of the first lead screw and the second lead screw are provided with lead screw brackets. One end of the first lead screw and the second lead screw is fixed to the lower rail by one of the lead screw brackets, and the other end of the first lead screw and the second lead screw is fixed to the lower rail by another lead screw bracket. When the upper rail module slides along the lower rail, the first lead screw and the second lead screw remain stationary.

3. The slide rail assembly according to claim 2, characterized in that, A rubber bushing is fitted at both ends of the first lead screw and the second lead screw, and the rubber bushing is located between the lead screw bracket and the first lead screw / second lead screw; Both ends of the first lead screw and the second lead screw are fastened to the lead screw bracket by fastening nuts, and the fastening nuts compress the rubber bushing.

4. The slide rail assembly according to claim 1, characterized in that, One or both ends of the upper rail are provided with a lead screw retainer, and the first lead screw and the second lead screw are both inserted in the lead screw retainer; Several support springs extend upward, downward, and to both sides from the lead screw holder, and the support springs move against the inner wall of the lower rail.

5. The slide rail assembly according to claim 1, characterized in that, The first and second worm gears have the same direction of tooth rotation; The active worm gear is made of metal, the first worm wheel and the second worm wheel are both made of plastic, and the first lead screw and the second lead screw are both made of metal.

6. The slide rail assembly according to claim 5, characterized in that, One end of the first worm gear is provided with a first metal nut that is integral with or separate from it, and the internal thread of the first metal nut is in the same direction as the internal thread of the first threaded hole; one end of the second worm gear is provided with a second metal nut that is integral with or separate from it, and the internal thread of the second metal nut is in the same direction as the internal thread of the second threaded hole. When the first worm gear and the first lead screw are normally engaged, the internal thread of the first metal nut does not contact the external thread of the first lead screw; when the second worm gear and the second lead screw are normally engaged, the internal thread of the second metal nut does not contact the external thread of the second lead screw. When the first worm gear wears or the external load increases to a preset value, the first metal nut can engage with the first lead screw; when the second worm gear wears or the external load increases to a preset value, the second metal nut can engage with the second lead screw.

7. The slide rail assembly according to claim 1, characterized in that, The lower rail has an upward opening along its length, a first winding pulley is provided at one end near the lower rail, and a second winding pulley is provided at the other end near the lower rail; A shielding strip is connected to the upper rail module. One end of the shielding strip is connected to one end of the upper rail module, and the other end of the shielding strip passes around the first winding wheel and the second winding wheel and is connected to the other end of the upper rail module. When the upper rail module slides along the lower rail, it drives the shielding strip, and the shielding strip always keeps the opening covered.

8. The slide rail assembly according to claim 7, characterized in that, The two ends of the shielding strip are respectively connected to the upper rail module to form a closed-loop shielding structure; and the sum of the lengths of the shielding strip and the upper rail module is greater than or equal to twice the length of the opening, so that when the upper rail module slides to any position of the opening, the opening is always in a completely shielded state.

9. The slide rail assembly according to claim 7, characterized in that, The lower rail is provided with a guide groove on each side near the opening, and the shielding strip is provided with a locking strip on each side, and the two locking strips are respectively engaged in the two guide grooves; The guide groove includes a snap-fit ​​section and a connecting section along its transverse direction. The connecting section is close to and communicates with the opening. The locking strip is movably snapped into the snap-fit ​​section, and the width of the locking strip is greater than the groove width of the connecting section.

10. An electric slide rail, characterized in that, include: The slide rail assembly as described in any one of claims 1-9; A motor is mounted on the upper rail module, and the output shaft of the motor is connected to the driving worm gear.

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