Self-lubricating pulley
By setting a self-lubricating part on the side of the anti-derailment ring of the synchronous belt pulley, and using electrostatic triggering to release lubricating oil, the noise problem of traditional synchronous belt pulleys is solved, achieving low noise and long service life under different working conditions.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHANGHAI MITSUBISHI ELEVATOR CO LTD
- Filing Date
- 2026-04-09
- Publication Date
- 2026-06-30
AI Technical Summary
Traditional synchronous belt pulleys generate noise when they come into contact with the retaining ring. Existing noise reduction methods are not very effective and may affect anti-derailment performance or shorten service life.
A self-lubricating part is set on the anti-slip ring side of the synchronous belt pulley. It adopts electrostatically driven elastic resin protrusions or coatings. The release of lubricating oil is triggered by electrostatics to reduce friction and noise. The anti-slip ring material and structure are optimized to adapt to different working conditions.
It effectively reduces friction noise, extends the service life of pulleys, adapts to lubrication needs under different working conditions, and improves the smoothness and comfort of elevator operation.
Smart Images
Figure CN122305208A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of mechanical transmission technology, and specifically to a self-lubricating synchronous belt pulley. Background Technology
[0002] The traditional synchronous belt pulleys in elevator door operators have a drawback: when the side of the synchronous belt contacts the pulley retainer ring, the friction between the two surfaces generates a chirping noise, significantly impacting the overall noise level of the elevator door system. Existing noise reduction strategies for synchronous belt pulleys aim to reduce the friction coefficient by decreasing the contact area, thereby lowering noise. Reference 1 (CN219796012U) reduces the contact area between the synchronous belt side and the retainer ring by adding through holes, countersunk holes, or grooves. However, excessive openings and grooves can affect the retainer ring's anti-detachment performance, and the noise reduction effect of this technology is not significant. Reference 2 (CN222760251U) simply adds protrusions to the pulley retainer ring to reduce friction, but the noise reduction effect is also insignificant. Furthermore, relying solely on protrusions for friction reduction significantly shortens the pulley's lifespan, as the protrusions often wear down quickly and fail. Summary of the Invention
[0003] To solve the above-mentioned technical problems, the present invention provides a self-lubricating synchronous belt pulley, wherein the synchronous belt pulley has anti-derailment rings on both sides; a self-lubricating part is provided at the corresponding position of the anti-derailment ring side and the synchronous belt; after the synchronous belt is installed on the synchronous belt pulley, the side of the synchronous belt contacts the self-lubricating part.
[0004] Preferably, the anti-detachment ring has an integrally formed protruding mounting base on its side, and a circular slot is provided at the top of the mounting base; the self-lubricating part is embedded in the circular slot, and the self-lubricating part is an electrostatically driven elastic resin protrusion.
[0005] Preferably, the wall thickness of the elastic resin bumps is between 1 and 5 μm.
[0006] Preferably, the core material of the elastic resin bumps is low-viscosity silicone oil.
[0007] Preferably, the anti-derailment ring has an integrally formed protruding mounting base on its side, and an elliptical slot is formed at the top of the mounting base; the slots are evenly distributed along the radial direction of the pulley; the self-lubricating part is embedded in the circular slot, and the self-lubricating part is an elastic resin protrusion driven by electrostatically active polymer as a carrier.
[0008] Preferably, the core material of the elastic resin protrusions is PAO synthetic oil.
[0009] Preferably, the elastic resin bumps are bonded to the grooves using a high-temperature injection molding process.
[0010] Preferably, the anti-detachment ring is made of low-temperature resistant sheet metal material and the surface is galvanized for corrosion protection; the side of the anti-detachment ring has an integrally formed protruding mounting base, and the top of the mounting base has a circular slot; the inner wall of the slot is roughened; the self-lubricating part is embedded in the circular slot, and the self-lubricating part is an electrostatically driven elastic resin bump with ion hydrogel as a carrier; the core material of the elastic resin bump is low-viscosity silicone oil.
[0011] Preferably, the self-lubricating part is a self-lubricating coating; the self-lubricating coating is based on polyvinyl alcohol-based ionic hydrogel and lithium salt composite hydrogel, with lithium bis(trifluoromethanesulfonyl)imide added as an ion source.
[0012] Preferably, the method for applying the self-lubricating coating to the anti-slip ring is as follows: using a scraper coating method, the gel slurry is evenly coated on the radial trajectory surface where the anti-slip ring contacts the side of the synchronous belt, the coating thickness is controlled, and after coating, it is placed in a constant temperature oven for curing to form the self-lubricating coating.
[0013] Preferably, the self-lubricating coating incorporates nano-alumina particles as a reinforcing agent into a polyvinyl alcohol-based ionic hydrogel, and undergoes a UV curing process after coating is completed. Attached Figure Description
[0014] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Figure 1 This is a schematic diagram of the synchronous belt pulley structure in Example 1. Detailed Implementation
[0015] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can fully understand other advantages and technical effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through different specific embodiments, and the details in this specification can also be applied based on different viewpoints, with various modifications or changes made without departing from the overall design concept of the invention. It should be noted that, unless otherwise specified, the following embodiments and features can be combined with each other. The following exemplary embodiments of the present invention can be implemented in many different forms and should not be construed as being limited to the specific embodiments set forth herein. It should be understood that these embodiments are provided to make the disclosure of the present invention thorough and complete, and to fully convey the technical solutions of these exemplary embodiments to those skilled in the art. Example 1
[0016] like Figure 1As shown, this embodiment provides a self-lubricating synchronous belt pulley, wherein the synchronous belt pulley has anti-slip rings 1 on both sides; a self-lubricating part 2 is provided on the side of the anti-slip ring 1 at the corresponding position of the synchronous belt; after the synchronous belt is installed on the synchronous belt pulley, the side of the synchronous belt contacts the self-lubricating part 2.
[0017] The anti-slip ring has a raised mounting base integrally formed on its side using sheet metal stamping. The height of the base is controlled to be 0.5mm, and a circular slot with a size matching the elastic resin protrusion is opened at the top of the base.
[0018] Special elastic resin protrusions are embedded into circular slots using injection molding. During injection molding, it is ensured that both the front and back sides of the slots are filled with elastic resin to clamp and fix the sheet metal base, thereby improving the reliability of the connection between the elastic resin protrusions and the anti-detachment ring. Elastic resin bump processing precision control: The wall material thickness is precisely controlled within 1-5μm to ensure structural stability under normal working conditions. Cracks or micropore expansion will only occur under specific electrostatic field strengths (such as ≥1kV / cm), effectively preventing accidental release of lubricating oil; Low viscosity silicone oil is preferred for the core material to meet the lubrication requirements of conventional elevator door operators. The working process of the self-lubricating part is as follows: When the side edge of the timing belt contacts the anti-slip ring, it will preferentially contact the elastic resin protrusions on the anti-slip ring, greatly reducing the direct contact area between the two. After the contact area is reduced, the coefficient of friction between the edge of the timing belt and the anti-slip ring is reduced, thereby reducing friction and effectively suppressing the noise generated by friction. At the same time, the static electricity generated by the friction between the timing belt and the protrusions triggers the above-mentioned electrostatic controllable lubrication principle, realizing the precise release of lubricating oil, further reducing the coefficient of friction and noise, and improving the smoothness and comfort of the elevator door operator. Example 2
[0019] The self-lubricating synchronous belt pulley in this embodiment is designed for high-speed elevator door operator synchronous belt pulleys, and is suitable for scenarios with high-frequency friction and high static electricity generation between the synchronous belt and the anti-derailment ring under high-speed operating conditions. The specific implementation method is as follows: The anti-derailment base material is made of high-strength cold-rolled sheet metal, which improves the overall rigidity of the anti-derailment and avoids deformation during high-speed transmission, ensuring the stability of the synchronous belt running trajectory; The mounting base is integrally formed by precision sheet metal stamping, appropriately increasing the height of the base. An elliptical slot is opened at the top, and the slots are evenly distributed along the radius of the pulley to adapt to the force requirements under high-speed conditions. The elastic resin bumps use electroactive polymer (EAP) as a carrier, and the wall thickness is reasonably controlled. The core material uses PAO synthetic oil, which has better high temperature resistance and anti-aging properties, and is suitable for the high temperature environment generated by high-speed friction. Injection molding process optimization: High-temperature injection molding process is adopted to ensure that the elastic resin fits tightly with the sheet metal groove, ensure the resin clamping thickness on both sides of the groove, and improve the connection stability of the elastic resin protrusions and anti-detachment rings under high-speed vibration. Appropriately increase the electrostatic trigger threshold to avoid accidental release of lubricating oil caused by slight static electricity during high-speed transmission, while ensuring that the static electricity generated by high-frequency friction can stably trigger lubrication; The working characteristics of the self-lubricating part in this embodiment are as follows: When the high-speed elevator door operator is running, the static electricity generated by the high-frequency contact friction between the synchronous belt and the elastic resin protrusions can stably trigger the release of lubricating oil. The PAO synthetic oil maintains good lubrication performance in high-temperature environments. The elliptical protrusions can further disperse contact stress, reduce wear, extend the service life of the anti-derailment ring, and significantly improve the noise control effect compared with conventional elevator solutions. Example 3
[0020] The self-lubricating synchronous belt pulley of this embodiment is designed for elevators in low-temperature environments (such as outdoor elevators and elevators in cold regions), solving the technical problems of increased lubricant viscosity and brittle elastic resin at low temperatures. The specific implementation method is as follows: The anti-slip ring is made of low-temperature resistant sheet metal material with a zinc-plated anti-corrosion treatment to prevent sheet metal corrosion in low-temperature environments and ensure the structural stability of the anti-slip ring. The height of the mounting base is kept consistent with the conventional solution (Example 1). A circular slot is opened at the top, and the inner wall of the slot is roughened to enhance the bonding force between the elastic resin and the slot and prevent the resin from separating from the sheet metal at low temperatures. The elastic resin bumps use ionic hydrogel as a carrier, and the wall material thickness is reasonably controlled. The core material is low-viscosity silicone oil, which has excellent low-temperature fluidity and can still maintain good lubrication performance in low-temperature environments. At the same time, the ionic hydrogel can maintain good elasticity at low temperatures and avoid brittleness. Adding a low-temperature toughening agent during injection molding enhances the low-temperature toughness of the elastic resin bumps, preventing them from being damaged by impact in low-temperature environments. Appropriately lower the electrostatic trigger threshold to adapt to the low electrostatic intensity generated by friction at low temperatures, and ensure the reliability of lubrication triggering; The self-lubricating part of this embodiment has the following working characteristics: In low-temperature environments, the elastic resin bumps maintain good elasticity, which can effectively reduce the friction area and noise when the synchronous belt contacts; the static electricity generated by friction can stably trigger the release of low-viscosity silicone oil, avoiding lubrication failure caused by the solidification of lubricating oil at low temperatures; at the same time, the low-temperature resistant material and anti-corrosion treatment can extend the service life of the anti-derailment ring, making it suitable for the use of elevators in cold regions. Example 4
[0021] The self-lubricating synchronous belt pulley in this embodiment is designed for high-cleanliness elevators used in medical or precision electronics factories.
[0022] The synchronous belt pulleys utilize a composite material coating process, eliminating the need for pre-lubrication. A lubricating film is directly generated on the anti-derailment surface via electrostatic triggering, resolving issues such as poor sealing and oil leakage in traditional lubrication structures. This makes it suitable for elevator scenarios with high cleanliness requirements (such as medical elevators and precision electronics factory elevators). The specific implementation method is as follows: The anti-detachment ring base material is made of ordinary cold-rolled sheet metal, and the surface is sandblasted to improve the adhesion between the composite material coating and the sheet metal surface and prevent the coating from falling off. Coating material preparation: Using polyvinyl alcohol (PVA) based ion hydrogel and lithium salt composite hydrogel as the core, an appropriate amount of LiTFSI (lithium bis(trifluoromethanesulfonyl)imide) is added as the ion source, and the mixture is stirred evenly to prepare a coatable gel slurry. This ensures that the slurry is uniformly dispersed and free of lumps, and the ion content is reasonably controlled to balance ion migration efficiency and coating stability. Coating process: The gel slurry is evenly coated on the radial track surface where the anti-detachment ring contacts the side of the synchronous belt using a scraper coating method. The coating thickness is controlled. After coating, the product is placed in a constant temperature oven for curing to form a dense and uniform composite material coating. Core working principle: When the synchronous belt comes into contact with the anti-derailment coating and generates static electricity through friction, the resulting negative electric field acts on the composite material, triggering the electroosmotic extraction effect—LiTFSI ions in the gel move towards the negative electrode of the electric field, while simultaneously driving the lubricating medium in the gel to quickly form an ultra-thin lubricating film on the coating surface, achieving the effect of "static triggering the formation of a lubricating layer"; The self-lubricating part has the following characteristics: it does not require pre-coating the material with lubricating oil, and generates a lubricating film entirely through electric field control, which solves the problems of poor sealing and oil leakage at the source and keeps the inside of the elevator door operator clean; at the same time, the lubricating film is generated with the static electricity and disappears when the static electricity disappears, supplying lubricating medium on demand and avoiding waste of lubricating medium; the coating has good elasticity and wear resistance, which can effectively reduce the contact friction between the synchronous belt and the anti-derailment ring, and the noise control effect is better than the traditional structure, making it suitable for the needs of high-cleanliness elevator scenarios. Example 5
[0023] The self-lubricating synchronous belt pulley in this embodiment is based on coated electrostatic triggering lubrication film technology and is optimized for heavy-duty elevators (such as freight elevators and hospital bed elevators, where the synchronous belt is subjected to large forces). Specifically, the coating material and process are improved, and the implementation method is as follows: nano-alumina particles are added to PVA-based ionic hydrogel as a reinforcing agent to improve the coating hardness and wear resistance; after coating, an ultraviolet curing process is added to further improve the adhesion between the coating and the sheet metal.
[0024] The core advantages of the self-lubricating part are: nano-alumina particles can significantly improve the wear resistance of the coating, greatly increase the coating hardness, and withstand the extrusion and friction of heavy-duty synchronous belts; at the same time, the function of electrostatic triggering of the lubricating film remains normal, and noise control and lubrication effect are not affected, making it fully suitable for the use requirements of heavy-duty elevators.
[0025] The present invention has been described in detail above through specific embodiments and examples, but these are not intended to limit the invention. Many modifications and improvements can be made by those skilled in the art without departing from the principles of the invention, and these should also be considered within the scope of protection of the present invention.
Claims
1. A self-lubricating synchronous belt pulley, characterized in that, The synchronous belt pulley has anti-derailment rings on both sides; the anti-derailment rings are provided with self-lubricating parts at the corresponding positions of the synchronous belt; after the synchronous belt is installed on the synchronous belt pulley, the side of the synchronous belt contacts the self-lubricating parts.
2. The self-lubricating synchronous belt pulley according to claim 1, characterized in that, The anti-detachment ring has an integrally formed protruding mounting base on its side, and a circular slot is provided at the top of the mounting base; the self-lubricating part is embedded in the circular slot, and the self-lubricating part is an electrostatically driven elastic resin protrusion.
3. The self-lubricating synchronous belt pulley according to claim 2, characterized in that, The wall thickness of the elastic resin bumps is between 1 and 5 μm.
4. The self-lubricating synchronous belt pulley according to claim 2, characterized in that, The core material of the elastic resin bumps is low-viscosity silicone oil.
5. The self-lubricating synchronous belt pulley according to claim 1, characterized in that, The anti-derailment ring has an integrally formed protruding mounting base on its side, and an elliptical slot is opened at the top of the mounting base; the slots are evenly distributed along the radial direction of the pulley; the self-lubricating part is embedded in the circular slot, and the self-lubricating part is an elastic resin protrusion driven by electrostatically active polymer as a carrier.
6. The self-lubricating synchronous belt pulley according to claim 5, characterized in that, The core material of the elastic resin bumps is PAO synthetic oil.
7. The self-lubricating synchronous belt pulley according to claim 5, characterized in that, The elastic resin protrusions are fitted to the slots using a high-temperature injection molding process.
8. The self-lubricating synchronous belt pulley according to claim 1, characterized in that, The anti-detachment ring is made of low-temperature resistant sheet metal material with galvanized anti-corrosion treatment on the surface; the side of the anti-detachment ring has an integrally formed protruding mounting base, and the top of the mounting base has a circular slot; the inner wall of the slot is roughened; the self-lubricating part is embedded in the circular slot, and the self-lubricating part is an elastic resin bump driven by electrostatics and using ion hydrogel as a carrier; the core material of the elastic resin bump is low viscosity silicone oil.
9. The self-lubricating synchronous belt pulley according to claim 1, characterized in that, The self-lubricating part is a self-lubricating coating; the self-lubricating coating is based on polyvinyl alcohol-based ionic hydrogel and lithium salt composite hydrogel, with lithium bis(trifluoromethanesulfonyl)imide added as an ion source.
10. The self-lubricating synchronous belt pulley according to claim 9, characterized in that, The method for applying the self-lubricating coating to the anti-slip ring is as follows: using a scraper coating method, the gel slurry is evenly coated on the radial track surface where the anti-slip ring contacts the side of the synchronous belt, the coating thickness is controlled, and after coating, it is placed in a constant temperature oven for curing to form the self-lubricating coating.
11. The self-lubricating synchronous belt pulley according to claim 9, characterized in that, The self-lubricating coating incorporates nano-alumina particles as a reinforcing agent into a polyvinyl alcohol-based ionic hydrogel, and undergoes a UV curing process after coating is completed.