Miniaturized slow descent mechanism

Abstract

The utility model provides a miniaturized slow -descent mechanism, including shaft sleeve, pivot and two check valve piece, the shaft sleeve contains the cavity that can fill damping oil, there are two oil separation piece in the cavity, there are two symmetrical oil passing muscle outside the axle core of pivot, and oil passing muscle sets up oil passing channel, and the axle core sets up oil passing groove, and oil separation piece divides the cavity into two buffer cavities, and oil passing groove is located in the axial range of oil passing channel and is circumferentially symmetrical, two check valve piece sets up in oil passing muscle, has the accommodating groove and oil passing hole, and has the swing gap with oil passing muscle, the utility model discloses through the structure optimization has effectively reduced the damping oil flow resistance, only exports the required damping effect in the key terminal stage, greatly reduces the stress load of pivot, thereby reduces the risk of broken axle, makes it can adapt smaller size's damping mechanism production, simultaneously need not relying on metal pivot to satisfy the strength requirement, finally realizes the comprehensive superiority of having small size, high strength and low cost.

Description

Technical Field

[0001] This utility model relates to the technical field of damping descent mechanisms, and in particular to a miniaturized descent mechanism. Background Technology

[0002] Damping mechanisms are widely used in various types of openable toilet seats, especially suitable for scenarios requiring unidirectional damping. Taking toilet seats as an example, no damping is needed during the lifting process; damping is only required during the lowering process to achieve a slow descent, thereby preventing the seat from colliding with the toilet body and ensuring safety and product lifespan.

[0003] In existing toilet seat soft-close damping mechanism designs, to balance structural strength and compact appearance, the overall size is typically controlled to approximately 20mm. Within this size range, the various components of the damping mechanism can be manufactured using plastic materials through a one-piece molding process, which meets the strength requirements for daily use while controlling production costs by simplifying the process.

[0004] However, as users demand higher levels of sophistication and aesthetic appeal from their products, there is a need to further reduce the overall size of the damping mechanism (e.g., reducing it to approximately 16mm). However, this reduction in size makes the damping mechanism's pivot, made of a single piece of plastic, prone to breakage and failure, failing to meet structural strength requirements. To address this strength bottleneck, current technologies typically use metals such as copper to manufacture the pivot component separately. While this ensures pivot strength, it significantly increases the manufacturing cost of the damping mechanism, hindering large-scale product adoption and market competitiveness.

[0005] In summary, existing toilet seat soft-close damping mechanisms face technical bottlenecks in balancing small size, high structural strength, and low-cost manufacturing. There is an urgent need for a damping structure based on improved plastic materials that can meet the requirements of small size design and structural strength while maintaining low manufacturing costs.

[0006] In view of this, the inventors specifically designed a miniaturized slow-descent mechanism, which led to this invention. Utility Model Content

[0007] To solve the above problems, the technical solution of this utility model is as follows: A miniaturized descent mechanism, comprising: The bushing has a cavity that can be filled with damping oil, and the cavity has two oil separators distributed radially thereon; The rotating shaft is sealed and rotates in conjunction with the cavity of the bushing. It includes the shaft core and two oil-passing ribs symmetrically arranged on its surface along the radial direction of the shaft core. The side of the oil-passing rib away from the shaft core is provided with an oil-passing channel that runs through both sides along the rotation direction of the shaft core. The surface of the shaft core on one side of the oil-passing channel is provided with several oil-passing grooves extending along the circumference of the shaft core. The oil separator contacts the surface of the shaft core to separate the cavity into two buffer cavities. Two one-way valve plates are movably sleeved on the outside of the oil-passing rib, including a receiving groove for accommodating the oil-passing rib and an oil-passing hole provided on the side wall of the one-way valve plate. The oil-passing hole extends through the receiving groove, and the oil-passing holes on the two one-way valve plates are respectively arranged facing the two oil separator plates. in: The bottom surface of the receiving groove is in contact with the oil-passing rib and the distance between the two sides is greater than that of the oil-passing rib to form a swing gap for the one-way valve plate to swing. The oil grooves are distributed within the coverage area of ​​the oil passage along the shaft core axis, and the oil grooves corresponding to the two oil passages are circumferentially symmetrical about the shaft core.

[0008] Preferably, the oil groove and oil channel are both located in the middle of the shaft core.

[0009] Preferably, the oil passage is provided in three parts.

[0010] Preferably, the oil groove located in the middle extends a greater distance along the outer peripheral surface of the shaft core than the oil grooves on both sides.

[0011] Preferably, the width of the oil groove gradually decreases in the direction away from the oil passage.

[0012] Preferably, the central angle range corresponding to the extension distance of the oil groove along the outer peripheral surface of the shaft core is 70~85°.

[0013] Preferably, the extension distance of the oil passage hole along the axial direction of the shaft core is less than that of the oil passage channel.

[0014] Preferably, the one-way valve plate has an auxiliary hole on the side wall on the same side as the oil passage hole.

[0015] Preferably, the bushing, the rotating shaft, and the one-way valve plate are all plastic parts.

[0016] Preferably, the maximum radial dimension of the bushing is 15-18 mm.

[0017] The beneficial effects of this utility model are as follows: This invention precisely controls the flow path and efficiency of damping oil through the coordinated design of multiple oil channels and a swingable one-way valve. When the toilet seat is raised, the one-way valve swings with the movement, and the damping oil flows rapidly within the cavity along one side of the valve and the gap between the oil channel and the oil separator, achieving a smooth, undamped lifting motion. When the seat descends, the one-way valve closes the corresponding oil channel. Initially, the damping oil can flow rapidly through the conventional channel at the bottom of the shaft and the gap between the oil channel and the oil separator. After the oil channel passes the oil separator, it relies solely on the conventional channel for oil flow, forming stable damping in the final stage to achieve a gentle descent. This structural optimization effectively reduces the flow resistance of the damping oil, outputting the required damping effect only in the critical final stage, significantly reducing the load on the shaft, thereby reducing the risk of shaft breakage and enabling the production of smaller damping mechanisms. Simultaneously, it meets strength requirements without relying on a metal shaft, ultimately achieving a comprehensive advantage of small size, high strength, and low cost.

[0018] In addition, by setting the oil groove and oil channel in the middle of the shaft core, the core area of ​​the shaft can form a concentrated reinforcement structure of ribs, grooves and channels, which further enhances the bending resistance of the middle of the shaft core, avoids the shaft from breaking due to uneven stress in small size, and ensures that the damping oil flows stably in the core area, thus improving the stability of damping performance.

[0019] In addition, by setting up three oil passages, the flow path and flow rate of damping oil between the two buffer chambers can be optimized, avoiding problems such as poor oil flow and slow-down jamming caused by single or double passages, ensuring that the toilet seat falls at a uniform speed and improving the user experience.

[0020] In addition, by making the extension distance of the oil passage groove in the middle position along the outer circumference of the shaft longer than that of the oil passage grooves on both sides, the edge of the longest oil passage groove can quickly contact the oil separator to create an oil passage gap when the shaft rotates, or delay the disappearance time of the oil passage gap between the oil passage groove and the oil separator. In conjunction with the other oil passage groove, the damping oil forms a phased flow, further optimizing the opening and closing experience of the toilet seat.

[0021] Furthermore, by gradually reducing the width of the oil groove away from the oil passage, both oil flow efficiency and shaft structural strength can be balanced. The wide groove near the oil passage ensures smooth oil flow, while the narrow groove away strengthens the local wall thickness of the shaft, avoiding local weakness caused by uniform groove width.

[0022] In addition, by setting the central angle corresponding to the distance the oil groove extends along the outer circumference of the shaft core to 70~85°, the flow rate and damping force of the damping oil can be precisely controlled. This avoids the oil flow being too slow and the descent being too long due to an excessively small central angle, and also prevents the oil flow being too fast and the damping being insufficient due to an excessively large central angle, thus ensuring that the descent speed meets the user's usage habits.

[0023] In addition, by making the extension distance of the oil passage hole along the shaft axis smaller than that of the oil passage channel, the flow range of damping oil through the oil passage hole can be limited, avoiding the instability of damping force caused by oil diversion, ensuring that the oil mainly flows through the oil passage channel and oil groove, and improving the consistency of the slow-down effect.

[0024] In addition, by providing an auxiliary hole on the side wall of the one-way valve plate on the same side as the oil passage hole, the auxiliary hole and the oil passage hole can be connected through the swing gap of the receiving groove during the opening process (i.e., when the one-way valve plate is open), which increases the flow of damping oil through the oil passage channel, thereby enhancing the smoothness of the toilet seat opening process.

[0025] In particular, by making the bushing, shaft, and one-way valve plate all plastic parts, the mature plastic one-piece molding process can be fully utilized, without the need for additional metal parts cutting, rust prevention, and assembly processes, which greatly reduces raw material and processing costs and is suitable for large-scale production.

[0026] Furthermore, by setting the maximum radial dimension of the bushing to 15-18mm, the range of small-size designs can be clearly defined, accurately matching users' needs for the exquisite appearance of the toilet seat, while reserving space for ultra-thin, curved and other styling designs of the toilet seat, thereby enhancing product competitiveness. Attached Figure Description

[0027] The accompanying drawings, which are provided to further illustrate the present invention and constitute a part of the present invention, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0028] in: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a partial cross-sectional view of the cavity in this utility model; Figure 3 This is a three-dimensional and exploded structural schematic diagram of the present invention; Figure 4 This is an exploded structural diagram of the present invention; Figure 5 This is a cross-sectional structural schematic diagram of the present invention; Figure 6 This is a three-dimensional structural diagram highlighting the rotating shaft in this utility model; Figure 7 This is a partial cross-sectional view of the structure highlighting the rotation of the shaft in this utility model; Figure 8 This is a three-dimensional structural diagram highlighting the two one-way valve plates in this utility model; Figure 9This is a partial cross-sectional view of the structure of the one-way valve plate and the oil-passing rib in this utility model. Figure 10 This is a three-dimensional structural diagram highlighting the cooperation structure between the one-way valve plate and the oil-passing rib in this utility model; Figure 11 This is a schematic diagram of the state changes of this utility model.

[0029] Label Explanation: 100. Bushing; 110. Cavity; 111. Buffer cavity; 112. Fitting ring; 120. Oil separator; 130. Adjusting part; 131. Adjusting port; 132. Adjusting cavity; 140. Adjusting valve seat; 200. Rotating shaft; 210. Output section; 220. Sealing section; 230. Shaft core; 231. Oil groove; 240. Oil rib; 241. Oil passage; 250. Fitting part; 300. One-way valve plate; 310. Receiving groove; 311. Swing clearance; 320. Oil hole; 330. Auxiliary hole. Detailed Implementation

[0030] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0031] Please see Figures 1 to 11 This is a miniaturized slow-descent mechanism, which is the preferred embodiment of the present invention. It includes a bushing 100, a rotating shaft 200, and two one-way valve plates 300, as detailed below: The bushing 100 is sleeve-shaped with a maximum outer diameter of 16 mm. The inner side of the bushing 100 has a cavity 110 that can be filled with damping oil. The cavity 110 is open on one side along its axial direction to facilitate the insertion of the rotating shaft 200. The cavity 110 has two oil separators 120 distributed radially along its direction. Both oil separators 120 are distributed along the axial direction of the cavity 110.

[0032] Furthermore, an adjustment part 130 is formed on the side of the bushing 100 away from the opening of its cavity 110. The outer diameter of the adjustment part 130 is smaller than that of the bushing 100, and an adjustment port 131 is formed on its inner side, extending axially into the cavity 110. An adjustment valve seat 140 is threadedly connected to the inner side of the adjustment port 131. The axial extension distance of the adjustment valve seat 140 is smaller than the depth of the adjustment port 131, so as to form an adjustment cavity 132 in the adjustment port 131. Based on this, a conventional channel for the flow of damping oil can be formed by cooperating with the axial end face of the rotating shaft 200. By rotating the adjustment valve seat 140, it can be moved in a direction close to or away from the cavity 110, and the size of the conventional channel can be adjusted, that is, the flow rate of the damping oil can be adjusted, thereby changing different damping and buffering effects.

[0033] The rotating shaft 200 includes an output section 210, a sealing section 220, a shaft core 230, and two oil-passing ribs 240 arranged coaxially in sequence on its surface. The shaft core 230 and the two oil-passing ribs 240 are inserted into the cavity 110. The sealing section 220 is rotatably and sealingly connected to the opening of the cavity 110 (by sealing ring). The output section 210 and the shaft sleeve 100 are used to connect the toilet seat and the corresponding fixing seat, so that the toilet seat and the fixing seat produce a corresponding damping rotation effect.

[0034] Specifically, the outer diameter of the shaft core 230 is smaller than that of the cavity 110, and the oil separator 120 extends to the outer circumferential surface of the shaft core 230, so that the oil separator 120 can cooperate with the shaft core 230 to divide the cavity 110 into two independent buffer cavities 111, and the damping oil is filled between the two buffer cavities 111.

[0035] To achieve a basic damping effect, the end of the shaft core 230 extends to the side of the cavity 110 near the adjustment part 130, and a mating part 250 is coaxially provided along its axial direction. The outer diameter of the mating part 250 is smaller than that of the shaft core 230. A mating ring 112 protrudes from the inner wall of the cavity 110 at the position of the mating part 250. There is a gap between the mating ring 112 and the mating part 250. This gap connects the adjustment cavity 132 and the cavity 110, and the three together form a conventional channel for the flow of damping oil.

[0036] The side of the oil-passing rib 240 away from the shaft core 230 is recessed inward to form an oil-passing channel 241 that runs through both sides along the rotation direction of the shaft core 230. On the surface of the spindle located on one side of the oil-passing channel 241, a number of oil-passing grooves 231 are formed, starting from the oil-passing rib 240 at that position and extending circumferentially along the shaft core 230. The oil-passing grooves 231 corresponding to the two oil-passing channels 241 are symmetrically distributed about the circumferential rotation of the shaft core 230.

[0037] In this embodiment, there are three oil grooves 231 located in the middle of the shaft core 230. The oil groove 231 located in the middle extends a greater distance along the outer circumferential surface of the shaft core 230 than the oil grooves 231 on both sides. The width of the oil groove 231 gradually decreases in the direction away from the oil passage 241. The sidewalls of the oil groove 231 are all arc-shaped transitions, thus finally forming a pointed arc-shaped groove that starts from the position of the oil rib 240 and gradually decreases towards the other side.

[0038] In this embodiment, the central angle corresponding to the extension distance of the longest oil groove 231 along the outer peripheral surface of the shaft core 230 is 83°, and the central angle corresponding to the extension distance of the other two oil grooves 231 along the outer peripheral surface of the shaft core 230 is 70°.

[0039] Thus, through the three oil passage grooves 231, they can cooperate with the oil separator 120 during rotation. When the longest middle oil passage groove 231 contacts the oil separator 120, a corresponding gap is randomly created using this oil passage groove 231, allowing the damping oil to flow between the two buffer chambers 111. Combined with the other two oil passage grooves 231, the flow rate of the damping oil can be adjusted in stages, producing a staged damping effect that better suits user habits. When the three oil passage grooves 231 rotate away from the oil separator 120 from their maximum contact position, a flow rate change effect from high to low can also be produced, adapting to the damping change process from fast to slow during toilet seat closure.

[0040] The two one-way valve plates 300 are in an inverted U-shape and are movably sleeved on the outside of the oil-passing rib 240. They include a receiving groove 310 with an inverted U-shaped cross-section for accommodating the oil-passing rib 240 and an oil-passing hole 320 provided on the side wall of the one-way valve plate 300. The oil-passing hole 320 extends along the opening side of the one-way valve plate 300 to the inner bottom surface of the receiving groove 310, and the oil-passing hole 320 penetrates the side wall of the one-way valve plate 300 and connects to the inner side of the receiving groove 310. When the two one-way valve plates 300 are respectively sleeved on the two oil-passing ribs 240, the openings of the oil-passing holes 320 at their upper ends face the different oil separator plates 120 on both sides.

[0041] The bottom surface of the receiving groove 310 contacts the outer surface of the oil-passing rib 240, and the distance between the two sides of the receiving groove 310 is greater than that of the oil-passing rib 240 (achieved through the inclination angle design of the inclined sidewall) to form an swing gap 311 for the one-way valve plate 300 to swing. When one of the oil-passing ribs 240 rotates away from the oil-passing hole 320 at the same position under the drive of the shaft core 230, due to the existence of the swing gap 311, the entire one-way valve plate 300 will swing in the opposite direction. At this time, the other side of the one-way valve plate 300 away from the oil-passing hole 320 tilts up, forming a swing gap 311. The gap connected by the oil passage 241 allows the damping oil to pass through the oil passage 320, the oil passage 241, and the gap formed by the warping along the side of the one-way valve plate 300 with the oil passage 320 in the same buffer chamber 111, and enter the other side of the one-way valve plate 300 in the same buffer chamber 111. This, together with the conventional channel of the damping oil and the gap formed between the oil passage groove 231 and the oil separator 120, forms three channels for the damping oil to flow simultaneously. This direction is designed as the opening direction, which can achieve the purpose of opening the cover without resistance.

[0042] Conversely, when the oil-passing rib 240 rotates in the direction close to the oil-passing hole 320 at the same position, due to the existence of the swing gap 311, the entire one-way valve plate 300 will swing in the opposite direction. At this time, the other side of the one-way valve plate 300 near the oil-passing hole 320 will be raised, while the other side will be completely attached to the side wall of the oil-passing rib 240. At this time, the aforementioned gap is closed, and the damping oil cannot pass through the oil-passing hole 320, the oil-passing channel 241, and the aforementioned gap. The one-way valve plate 300 is in a closed state. This direction is designed as the closing direction. In the initial state, the gap between the oil-passing groove 231 and the oil separator 120, as well as the conventional channel, can still allow the damping oil to pass through. After the oil-passing groove 231 passes the oil separator 120, the damping oil can only flow through the conventional channel, which effectively reduces the flow resistance of the damping oil and outputs the required damping effect only at the critical end stage. This significantly reduces the stress load on the rotating shaft 200, thereby reducing the risk of shaft breakage and enabling it to be adapted to the production of smaller damping mechanisms.

[0043] Several oil grooves 231 are distributed within the coverage area of ​​the oil passage 241 along the axial direction of the shaft core 230.

[0044] Preferably, the oil groove 231 and the oil passage 241 are both located in the middle of the shaft core 230.

[0045] Preferably, the extension distance of the oil passage 320 along the axial direction of the shaft core 230 is less than that of the oil passage 241.

[0046] Preferably, the one-way valve plate 300 is provided with an auxiliary hole 330 on the side wall on the same side as the oil passage hole 320. In this embodiment, the auxiliary hole 330 is located on one side edge of the one-way valve plate 300 near the output section 210 of the rotating shaft 200.

[0047] Preferably, the bushing 100, the rotating shaft 200, and the one-way valve plate 300 are all plastic parts.

[0048] The beneficial effects of this utility model are as follows: This invention precisely controls the flow path and efficiency of damping oil through the coordinated design of multiple oil passage grooves 231 and a swingable one-way valve plate 300: When the toilet seat is lifted, the one-way valve plate 300 swings with the movement, and the damping oil flows rapidly in the cavity 110 along one side of the valve plate and the gap between the oil passage groove 231 and the oil separator 120, achieving smooth lifting without damping; when lowering, the one-way valve plate 300 closes the corresponding oil passage channel 241. Initially, the damping oil can flow rapidly through the conventional channel at the bottom of the shaft core 230 and the gap between the oil passage groove 231 and the oil separator 120. After the oil passage groove 231 passes the oil separator 120, it only relies on the conventional channel for oil passage, forming stable damping in the final stage to achieve slow descent. The above structural optimization effectively reduces the flow resistance of the damping oil, outputs the required damping effect only at the critical end stage, significantly reduces the stress load on the shaft 200, thereby reducing the risk of shaft breakage and enabling it to be adapted to the production of smaller damping mechanisms; at the same time, it can meet the strength requirements without relying on the metal shaft 200, ultimately achieving a combination of advantages of small size, high strength and low cost.

[0049] In addition, by setting both the oil groove 231 and the oil channel 241 in the middle of the shaft core 230, the core area of ​​the rotating shaft 200 under stress can form a concentrated reinforcement structure of ribs, grooves and channels, which further strengthens the bending resistance of the middle part of the shaft core 230, avoids the small-sized rotating shaft 200 from breaking due to uneven stress, and at the same time ensures that the damping oil flows stably in the core area, improving the stability of damping performance.

[0050] In addition, by setting up three oil passages 231, the flow path and flow rate of damping oil between the two buffer chambers 111 can be optimized, avoiding problems such as poor oil flow and slow-down jamming caused by single or double passages, ensuring that the toilet seat falls at a uniform speed and improving the user experience.

[0051] Furthermore, by making the extension distance of the oil passage groove 231 in the middle position along the outer peripheral surface of the shaft core 230 greater than that of the oil passage grooves 231 on both sides, the edge of the longest oil passage groove 231 can quickly contact the oil separator 120 to create an oil passage gap when the shaft core 230 rotates, or delay the disappearance time of the oil passage gap between the oil passage groove 231 and the oil separator 120. In conjunction with the other oil passage groove 231, the damping oil forms a phased flow, further optimizing the opening and closing experience of the toilet seat.

[0052] Furthermore, by gradually reducing the width of the oil groove 231 away from the oil passage 241, both oil flow efficiency and structural strength of the shaft 200 can be balanced. The wide groove near the oil passage 241 ensures smooth oil flow, while the narrow groove away strengthens the local wall thickness of the shaft 200, avoiding local weakness caused by uniform groove width.

[0053] In addition, by setting the central angle corresponding to the distance the oil groove 231 extends along the outer circumference of the shaft core 230 to 70~85°, the flow rate of the damping oil and the magnitude of the damping force can be precisely controlled. This avoids the oil flow being too slow and the descent being too long due to an excessively small central angle, and also prevents the oil flow being too fast and the damping being insufficient due to an excessively large central angle, thus ensuring that the descent speed meets the user's usage habits.

[0054] In addition, by making the extension distance of the oil passage 320 along the axial direction of the shaft core 230 less than that of the oil passage 241, the flow range of damping oil through the oil passage 320 can be limited, avoiding the instability of damping force caused by oil diversion, ensuring that the oil mainly flows through the oil passage 241 and the oil groove 231, and improving the consistency of the slow-down effect.

[0055] In addition, by providing an auxiliary hole 330 on the side wall of the one-way valve plate 300 on the same side as the oil passage hole 320, the auxiliary hole 330 and the oil passage hole 320 can be connected through the swing gap 311 of the receiving groove 310 during the opening process (i.e., when the one-way valve plate 300 is open), the flow of damping oil through the oil passage channel 241 is increased, thereby enhancing the smoothness of the toilet seat opening process.

[0056] In particular, by making the bushing 100, the rotating shaft 200 and the one-way valve plate 300 all plastic parts, the mature plastic one-piece molding process can be fully utilized without the need for additional metal parts cutting, rust prevention and assembly processes, which greatly reduces raw material and processing costs and is suitable for large-scale production.

[0057] Furthermore, by setting the maximum radial dimension of the bushing 100 to 15-18mm, the small-size design range can be clearly defined, accurately matching users' needs for the exquisite appearance of the toilet seat, while reserving space for ultra-thin, curved and other styling designs of the toilet seat, thereby enhancing product competitiveness.

[0058] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A miniaturized slow-descent mechanism, characterized in that, include: The bushing (100) has a cavity (110) that can be filled with damping oil, and the cavity (110) has two oil separators (120) distributed radially thereon. The rotating shaft (200) is sealed and rotates in conjunction with the cavity (110) of the bushing (100), including a shaft core (230) and two oil-passing ribs (240) symmetrically arranged on its surface along the radial direction of the shaft core (230). The side of the oil-passing rib (240) away from the shaft core (230) is provided with an oil-passing channel (241) that runs through both sides along the rotation direction of the shaft core (230). The surface of the spindle on one side of the oil-passing channel (241) is provided with a plurality of oil-passing grooves (231) extending circumferentially along the shaft core (230). The oil separator (120) contacts the surface of the shaft core (230) to separate the cavity (110) into two buffer cavities (111). Two one-way valve plates (300) are movably sleeved on the outside of the oil-passing rib (240), including a receiving groove (310) for accommodating the oil-passing rib (240) and an oil-passing hole (320) provided on the side wall of the one-way valve plate (300). The oil-passing hole (320) extends through the receiving groove (310), and the oil-passing holes (320) on the two one-way valve plates (300) are respectively arranged facing the two oil separators (120); in: The bottom surface of the receiving groove (310) is in contact with the oil-passing rib (240) and the distance between the two sides is greater than that of the oil-passing rib (240) to form an swing gap (311) for the one-way valve plate (300) to swing. Several oil grooves (231) are distributed within the coverage area of ​​the oil passage (241) along the axial direction of the shaft core (230), and the oil grooves (231) corresponding to the two oil passages (241) are circumferentially symmetrical about the shaft core (230).

2. The miniaturized slow-descent mechanism according to claim 1, characterized in that, The oil groove (231) and oil passage (241) are both located in the middle of the shaft core (230).

3. The miniaturized slow-descent mechanism according to claim 1, characterized in that, The oil passage (231) is provided in three parts.

4. A miniaturized slow-descent mechanism according to claim 3, characterized in that, The oil groove (231) located in the middle extends a greater distance along the outer peripheral surface of the shaft core (230) than the oil grooves (231) on both sides.

5. A miniaturized slow-descent mechanism according to claim 1, characterized in that, The width of the oil groove (231) gradually decreases in the direction away from the oil passage (241).

6. A miniaturized slow-descent mechanism according to claim 1, characterized in that, The central angle range corresponding to the extension distance of the oil groove (231) along the outer peripheral surface of the shaft core (230) is 70~85°.

7. A miniaturized slow-descent mechanism according to claim 1, characterized in that, The extension distance of the oil passage (320) along the axial direction of the shaft core (230) is less than that of the oil passage (241).

8. A miniaturized slow-descent mechanism according to claim 1, characterized in that, The one-way valve plate (300) is provided with an auxiliary hole (330) on the side wall on the same side as the oil passage hole (320).

9. A miniaturized slow-descent mechanism according to claim 1, characterized in that, The bushing (100), the shaft (200), and the one-way valve plate (300) are all made of plastic.

10. A miniaturized slow-descent mechanism according to claim 1, characterized in that, The maximum radial dimension of the bushing (100) is 15-18 mm.

Images