Synchronous extension linkage mechanism of three-section slide rail

Abstract

The utility model relates to slide rail technical field, concretely is the synchronous telescopic linkage mechanism of three section type slide rail, including lower rail, middle rail and upper rail, install lower load wheel group in lower rail, install upper load wheel group on the outside of middle rail top, lower load wheel group includes support frame, is set up in support frame tooth slot and cavity, the first and last both ends of cavity are equipped with cover plate, the top wall of cavity is set up and inserts the partition strip in oil injection cavity, is equipped with threaded rod between the bottom of two cover plates, is equipped with push plug in the cavity, the cavity is filled with the grease, is set up a plurality of oil outlet holes in the groove bottom of tooth slot. The synchronous telescopic linkage mechanism of three section type slide rail, through setting up oil injection cavity, cavity and the matched push plug, threaded rod etc. structure, through the rotation screw handle drive threaded rod rotation, can push plug along the cavity moves, makes the grease to enter oil injection cavity and through the oil outlet hole delivery to the meshing surface of tooth slot after receiving extrusion force, realizes the sustained lubrication to gear.

Description

Technical Field

[0001] This utility model relates to the field of slide rail technology, specifically to a synchronous telescopic linkage mechanism for a three-section slide rail. Background Technology

[0002] The three-section sliding rail synchronous telescopic linkage mechanism is a common linear transmission device widely used in furniture, industrial equipment, automobiles, and other fields. It achieves long-distance extension and retraction through a multi-rail nested structure, and the synchronous telescopic design ensures coordinated movement of each rail, making the opening and closing of drawers, slides, and other components smoother, thus supporting space utilization and operational convenience for various devices.

[0003] Utility model patent CN223041141U discloses an improved three-section synchronous slide rail. This improved three-section synchronous slide rail includes a bracket, a lower rail, a middle rail, and an upper rail. The upper rail includes a first upper rail connector and a second upper rail connector. Two second upper rail connectors on both sides extend vertically downwards and bend horizontally inwards to form a third upper rail connector. The lower rail includes a first lower rail connector and a second lower rail connector. Two second lower rail connectors on both sides extend vertically upwards and bend horizontally inwards to form a third lower rail connector. The middle rail includes a first middle rail connector and a second middle rail connector. Two second middle rail connectors on both sides extend vertically downwards and bend horizontally outwards to form a third middle rail connector. The two second middle rail connectors on both sides are connected to the first middle rail connector by arc-shaped blocks. An arc-shaped groove is provided on the third upper rail connector, and the arc-shaped groove and the arc-shaped block are concentric. Load-bearing wheel sets are provided between the upper rail and the middle rail, and between the lower rail and the middle rail. This improved three-section synchronous slide rail has better load-bearing capacity and stability.

[0004] This improved three-section synchronous slide rail achieves synchronous extension and retraction through a gear and rack transmission mechanism, but the meshing parts of the gears and rack lack a dedicated lubrication structure. However, during long-term use, the meshing surfaces of the gears and rack will wear due to friction, requiring periodic external application of grease to maintain lubrication. Furthermore, because there is no built-in grease storage and metering device, lubrication may be untimely or unevenly distributed, leading to a gradual increase in the transmission resistance of the gear and rack, affecting the synchronous extension and retraction accuracy and service life of the slide rail. Therefore, we propose a synchronous extension and retraction linkage mechanism for the three-section slide rail. Utility Model Content

[0005] The purpose of this invention is to provide a synchronous telescopic linkage mechanism for a three-section slide rail to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A synchronous telescopic linkage mechanism for a three-section slide rail includes a lower rail, a middle rail sleeved within the lower rail, and an upper rail sleeved on top of the middle rail. A lower load-bearing wheel assembly for supporting the middle rail is installed inside the lower rail. An upper load-bearing wheel assembly for supporting the upper rail is installed on the outer side of the top of the middle rail. The lower load-bearing wheel assembly includes a support frame fixed to the middle of the inner bottom wall of the lower rail. A toothed groove is formed at the outer end of the support frame. A through-cavity is formed inside the support frame along its axial direction. Cover plates are installed at both ends of the cavity. A groove is formed on the top wall of the cavity below the toothed groove. The oil filling chamber has a partition strip inserted along its axial direction. The top surface of the end of the partition strip has a through oil groove. The cavity and the oil filling chamber are connected through the oil groove. A threaded rod is rotatably connected between the bottoms of the two cover plates. The first end of the threaded rod extends through to the outside of the cavity and is coaxially connected to a handle. A push plug is slidably connected in the cavity. A sealing post is sleeved in the middle of the push plug. The threaded rod passes through the sealing post and is threadedly connected to the sealing post. The cavity is filled with grease. The bottom of the toothed groove has several oil outlet holes that communicate with the oil filling chamber.

[0007] Preferably, the top of the support frame is rotatably connected to a plurality of rollers along its axial direction, and the rollers abut against and are in rolling connection with the inner wall of the inner top wall of the middle rail; In this configuration, the rollers reduce friction between the center rail and the support frame during sliding, while also providing auxiliary support to the center rail and improving sliding stability.

[0008] Preferably, slots are provided on the inner walls of both the left and right sides of the oil injection chamber, and the left and right sides of the separator are respectively inserted into the two slots. The length of the separator is the same as the length of the slot, and the separator separates the cavity from the oil injection chamber. In this setting, the slot can fix the position of the separator bar, which can prevent the grease in the cavity from entering the oil filling cavity in advance when it is not in use, ensuring that the grease is released as needed.

[0009] Preferably, a protruding plug is provided on the bottom end face of the cover plate near the support frame, and the plug extends into the cavity; In this configuration, the plunger enhances the seal at the connection between the cover plate and the cavity, reducing the possibility of grease leakage from both ends of the cavity.

[0010] Preferably, the first end of the separator is provided with an end plug, which is inserted into the first end of the oil injection chamber; In this setting, the end plug can seal the beginning of the oil injection chamber, preventing grease from overflowing from the beginning of the oil injection chamber and improving the sealing performance of the oil injection chamber.

[0011] Preferably, the push plug has a cavity for installing the sealing column, and both ends of the push plug have through holes that communicate with the cavity, the diameter of the through holes being smaller than the inner diameter of the cavity. In this configuration, the cavity provides installation space for the sealing post, and the through hole restricts the range of movement of the sealing post, preventing it from detaching from the push plug.

[0012] Preferably, an annular groove is formed on the outer peripheral surface of the push plug, and a sealing ring is embedded in the annular groove. The sealing ring plays a sealing role between the inner wall of the cavity and the outer peripheral wall of the push plug. A protruding protrusion is provided at the top corner of the sealing ring. The protrusion extends into the bottom of the oil injection cavity and abuts against the bottom surface of the separator strip. In this configuration, the sealing ring enhances the seal between the push plug and the inner wall of the cavity, while the protrusion further improves the sealing effect at the separator strip, reducing grease leakage.

[0013] Preferably, by pushing the pusher to move within the oil injection chamber, the pusher can push the grease into the oil injection chamber and discharge it from the oil outlet into the tooth groove; In this setting, the release of grease can be controlled by moving the pusher, allowing the grease to accurately enter the gear groove through the oil injection chamber and oil outlet, thus achieving effective lubrication of the gear.

[0014] Compared with the prior art, the beneficial effects of this utility model are: The synchronous telescopic linkage mechanism of this three-section slide rail features an oil injection chamber, a cavity, and matching push plugs and threaded rods at corresponding positions on the tooth grooves of the support frame. A certain amount of grease can be stored in the cavity. By rotating the handle, the threaded rod rotates, pushing the push plug along the cavity. This forces the grease to be compressed and enter the oil injection chamber through the oil channel, then precisely delivered to the meshing surface of the tooth grooves through the oil outlet. This ensures continuous lubrication of the gears, guarantees uniform grease distribution at the meshing points of the gears and tooth grooves, reduces friction and wear, maintains stable transmission efficiency, and extends the service life of the gear and rack transmission mechanism. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the structure of the lower load-bearing wheel assembly of this utility model; Figure 3 This is an exploded view of the lower load-bearing wheel assembly of this utility model; Figure 4 This is a cross-sectional view of the support frame in this utility model; Figure 5 This is a schematic diagram of the cover plate in this utility model; Figure 6This is a schematic diagram of the structure of the separator strip in this utility model; Figure 7 This is an exploded view of the pusher in this utility model; The meanings of the labels in the diagram are as follows: 100. Lower rail; 200, middle track; 300, upper rail; 400. Lower load-bearing roller assembly; 410. Support frame; 411. Tooth groove; 412. Roller; 413. Cavity; 414. Oil filling chamber; 4141. Slot; 415. Oil outlet; 420. Cover plate; 421. Plug; 430. Separator bar; 431. End plug; 432. Oil passage groove; 440. Threaded rod; 441. Handle; 450. Push plug; 451. Sleeve cavity; 452. Sealing column; 453. Annular groove; 454. Sealing ring; 4541. Protrusion; 500, Upper load-bearing wheel assembly. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. 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.

[0017] Please see Figures 1-7 A synchronous telescopic linkage mechanism for a three-section slide rail includes a lower rail 100, a middle rail 200 sleeved in the lower rail 100, and an upper rail 300 sleeved on top of the middle rail 200. A lower load-bearing wheel assembly 400 for supporting the middle rail 200 is installed inside the lower rail 100. An upper load-bearing wheel assembly 500 for supporting the middle rail 200 is installed on the outer side of the top of the middle rail 200. The lower load-bearing wheel assembly 400 includes a support frame 410 fixed to the middle of the inner bottom wall of the lower rail 100. The frame 410 is made of high-strength alloy steel and has good load-bearing capacity. The outer end of the support frame 410 is provided with a toothed groove 411. The top of the support frame 410 is rotatably connected with several rollers 412 along its axis. The rollers 412 abut against and roll against the inner wall of the inner top of the middle rail 200. The rollers 412 are made of wear-resistant rubber material, which can reduce friction with the middle rail 200 and assist in supporting the middle rail 200, making the middle rail 200 more stable when sliding.

[0018] like Figures 2-5As shown, in this utility model, a through cavity 413 is provided inside the support frame 410 along its axial direction. The cavity 413 provides storage space for grease. Both ends of the cavity 413 are equipped with cover plates 420. The cover plates 420 are made of stainless steel and have good sealing and corrosion resistance. A protruding plug 421 is provided on the bottom of the end face of the cover plate 420 near the support frame 410. The plug 421 extends into the cavity 413. The plug 421 is made of rubber, which can enhance the sealing of the cavity 413 and further prevent grease leakage.

[0019] like Figures 2-4 and Figure 6 As shown, specifically, an oil injection chamber 414 is provided on the top wall of the cavity 413, located below the tooth groove 411. The oil injection chamber 414 provides a channel for grease to flow to the tooth groove 411. A separator strip 430 is inserted into the oil injection chamber 414 along its axial direction. The separator strip 430 is made of engineering plastic and has a certain degree of toughness and wear resistance. A through oil groove 432 is provided on the top surface of the tail end of the separator strip 430. The oil groove 432 can control the flow speed and flow rate of the grease. The 3-section is connected to the oil filling cavity 414 via an oil passage groove 432. Slots 4141 are provided on the inner walls of both sides of the oil filling cavity 414. The left and right sides of the separator strip 430 are respectively inserted into the two slots 4141. The slots 4141 position and fix the separator strip 430. The length of the separator strip 430 is the same as the length of the slots 4141. The separator strip 430 separates the cavity 413 and the oil filling cavity 414, preventing grease from prematurely entering the oil filling cavity 414 before use. An end plug 431 made of rubber is provided at the first end of the separator strip 430 to enhance the sealing of the first end of the oil filling cavity 414. The end plug 431 is inserted into the first end of the oil filling cavity 414.

[0020] like Figure 3 As shown, furthermore, a threaded rod 440 is rotatably connected between the bottoms of the two cover plates 420. The threaded rod 440 is made of high-strength steel and its surface is treated with anti-rust. The first end of the threaded rod 440 extends through to the outside of the cavity 413 and is coaxially connected to a handle 441. The handle 441 is made of plastic, which is convenient for the operator to hold and rotate. The handle 441 is located on the outside of the support frame 410. A push plug 450 is slidably connected in the cavity 413. The push plug 450 is made of rubber and has good sealing and elasticity. A sealing post 452 is sleeved in the middle of the push plug 450. The sealing post 452 is made of metal, which can enhance the threaded connection strength with the threaded rod 440. The threaded rod 440 passes through the sealing post 452 and is threadedly connected to the sealing post 452. This connection method can convert the rotational motion of the threaded rod 440 into the linear motion of the push plug 450.

[0021] like Figure 3 and Figure 7As shown, the push plug 450 also has a cavity 451 for installing the sealing post 452. The cavity 451 provides installation space for the sealing post 452. Both ends of the push plug 450 have through holes communicating with the cavity 451. The diameter of the through holes is smaller than the inner diameter of the cavity 451 to prevent the sealing post 452 from falling out of the push plug 450. An annular groove 453 is formed on the outer circumferential surface of the push plug 450. A sealing ring 454 is embedded in the annular groove 453. The sealing ring 454 is made of oil-resistant rubber, which can enhance the sealing between the outer circumferential wall of the push plug 450 and the inner wall of the cavity 413. The sealing ring 454 plays a sealing role between the cavity 413 and the push plug 450, preventing grease from leaking from the gap between the push plug 450 and the cavity 413. The top corner of the sealing ring 454 is provided with a protruding protrusion 4541. The protrusion 4541 extends into the bottom of the oil injection cavity 414 and abuts against the bottom surface of the partition strip 430, which can further enhance the sealing performance of the partition strip 430.

[0022] like Figure 3 As shown, it is worth noting that the cavity 413 is filled with grease, and the grease is only contained in the cavity 413 between the push plug 450 and the end cover plate 420. Several oil outlet holes 415, connected to the oil filling chamber 414, are provided at the bottom of the tooth groove 411. The oil outlet holes 415 can evenly deliver the grease to the gear meshing points within the tooth groove 411. Initially, the grease contained in the cavity 413 is insufficient to flow into all the tooth grooves 411 through the oil outlet holes 415; it can only enter all the tooth grooves 411 after being compressed. By rotating the handle 441, the handle 441 drives the threaded rod 440 to rotate. At this time, under the action of the thread, the push plug 450 moves within the oil filling chamber 414, thereby allowing the push plug 450 to push the grease through the oil passage 432 into the oil filling chamber 414 and discharge it into the tooth grooves 411 through the oil outlet holes 415, achieving the purpose of lubricating the gears.

[0023] In this embodiment, the synchronous telescopic linkage mechanism of the three-section slide rail works as follows: First, the handle 441 is rotated, which drives the threaded rod 440 to rotate. Then, under the action of the thread, the sealing column 452 drives the push plug 450 to move along the axial direction in the cavity 413. Next, the push plug 450 pushes the grease in the cavity 413. After being squeezed, the grease enters the oil filling chamber 414 through the oil groove 432 at the end of the separator 430. Finally, the grease flows from the oil filling chamber 414 into the gear groove 411 through the oil outlet 415 to lubricate the gear meshing with the gear groove 411.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A synchronous telescopic linkage mechanism for a three-section slide rail, comprising a lower rail (100), a middle rail (200) sleeved in the lower rail (100), and an upper rail (300) sleeved on top of the middle rail (200), wherein a lower load-bearing wheel assembly (400) for supporting the middle rail (200) is installed inside the lower rail (100), and an upper load-bearing wheel assembly (500) for supporting the upper rail (300) is installed on the outer side of the top of the middle rail (200), characterized in that: The lower load-bearing wheel assembly (400) includes a support frame (410) fixed in the middle of the inner bottom wall of the lower rail (100). A toothed groove (411) is provided at the outer end of the support frame (410). A through cavity (413) is provided inside the support frame (410) along its axial direction. Cover plates (420) are installed at both ends of the cavity (413). An oil filling chamber (414) is provided on the top wall of the cavity (413) below the toothed groove (411). A separator strip (430) is inserted into the oil filling chamber (414) along its axial direction. A through oil groove (432) is provided on the top surface of the tail end of the separator strip (430). The cavity (413) and the oil filling chamber... The cavity (414) is connected through the oil passage groove (432). A threaded rod (440) is rotatably connected between the bottoms of the two cover plates (420). The first end of the threaded rod (440) extends through to the outside of the cavity (413) and is coaxially connected to a handle (441). A push plug (450) is slidably connected in the cavity (413). A sealing post (452) is sleeved in the middle of the push plug (450). The threaded rod (440) passes through the sealing post (452) and is threadedly connected to the sealing post (452). The cavity (413) is filled with grease. Several oil outlet holes (415) connected to the oil filling cavity (414) are opened at the bottom of the groove (411).

2. The synchronous telescopic linkage mechanism of the three-section slide rail according to claim 1, characterized in that: The top of the support frame (410) is rotatably connected to several rollers (412) along its axial direction. The rollers (412) abut against and roll against the inner wall of the inner top wall of the middle rail (200).

3. The synchronous telescopic linkage mechanism of the three-section slide rail according to claim 1, characterized in that: Slots (4141) are provided on the inner walls of the left and right sides of the oil filling cavity (414). The left and right sides of the separator (430) are respectively inserted into the two slots (4141). The length of the separator (430) is the same as the length of the slot (4141). The separator (430) separates the cavity (413) and the oil filling cavity (414).

4. The synchronous telescopic linkage mechanism of the three-section slide rail according to claim 1, characterized in that: A protruding plug (421) is provided on the bottom end face of the cover plate (420) near the support frame (410), and the plug (421) extends into the cavity (413).

5. The synchronous telescopic linkage mechanism of the three-section slide rail according to claim 1, characterized in that: The first end of the separator (430) is provided with an end plug (431), which is inserted into the first end of the oil injection chamber (414).

6. The synchronous telescopic linkage mechanism of the three-section slide rail according to claim 1, characterized in that: The push plug (450) has a cavity (451) for installing the sealing column (452). Both ends of the push plug (450) have through holes that communicate with the cavity (451). The diameter of the through holes is smaller than the inner diameter of the cavity (451).

7. The synchronous telescopic linkage mechanism of the three-section slide rail according to claim 1, characterized in that: An annular groove (453) is provided on the outer peripheral surface of the push plug (450), and a sealing ring (454) is embedded in the annular groove (453). The sealing ring (454) plays a sealing role between the inner wall of the cavity (413) and the outer peripheral wall of the push plug (450). A protruding bump (4541) is provided at the top corner of the sealing ring (454). The bump (4541) extends into the bottom of the oil injection cavity (414) and abuts against the bottom surface of the separator strip (430).

8. The synchronous telescopic linkage mechanism of the three-section slide rail according to claim 1, characterized in that: By pushing the pusher (450) to move within the oil filling chamber (414), the pusher (450) can push the grease into the oil filling chamber (414) and discharge it from the oil outlet (415) into the tooth groove (411).

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