Low noise synchronous belt pulley

Abstract

The application discloses a low-noise synchronous belt pulley, which has anti-coming-off rings on both sides; convex points are arranged at positions corresponding to the teeth of the synchronous belt on the side surfaces of the anti-coming-off rings; and the side surfaces of the teeth of the synchronous belt are in contact with the convex points after the synchronous belt is installed on the synchronous belt pulley. The application can reduce the noise during the operation of the synchronous belt.

Description

Technical Field

[0001] This invention relates to the field of mechanical transmission technology, and specifically to a low-noise 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 approaches the pulley retainer, the friction between the two surfaces generates a chirping noise, significantly impacting the overall noise level of the elevator door system. Existing noise reduction approaches for synchronous belt pulleys aim to replace sliding friction with rolling friction, relying on rolling elements for noise reduction. However, these methods are complex and costly, as illustrated in reference 1 (CN218761244U). Reference 2 (CN219796012U) uses through holes, countersunk holes, or grooves on the retainer to reduce the contact area between the side of the synchronous belt and the retainer. However, excessive openings and grooves can affect the retainer's anti-detachment performance. Reference 3 (CN222760251U) simply adds protrusions to the pulley retainer to reduce friction, resulting in minimal noise reduction and limited specifications. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the present invention provides a low-noise synchronous belt pulley, wherein the synchronous belt pulley has anti-derailment rings on both sides; the anti-derailment rings are provided with protrusions at the corresponding positions of the teeth of the synchronous belt; after the synchronous belt is installed on the synchronous belt pulley, the side of the teeth of the synchronous belt contacts the protrusions.

[0004] Preferably, the protrusions are punched out using a sheet metal stamping process.

[0005] Preferably, the protrusion is fixed to the side of the anti-slip ring by means of threads.

[0006] Preferably, the anti-detachment ring has a raised mounting base integrally formed by sheet metal stamping process, and a groove is opened at the top of the mounting base, with an elastic buffer protrusion embedded in the groove.

[0007] Preferably, the protrusions are arc-shaped strips and distributed in a ring array.

[0008] Preferably, the number of the protrusions is ROUNDUP(D / n), where ROUNDUP is the round-up function, D is the diameter of the synchronous belt pulley in millimeters, and n is an integer between 8 and 12.

[0009] Preferably, the anti-detachment ring has a circular magnetic mounting groove formed by sheet metal stamping, and a permanent magnet is embedded in the mounting groove; the bottom of the protrusion is made of ferromagnetic metal, and the top is made of wear-resistant engineering plastic.

[0010] Preferably, the height of the protrusion is adjustable. Attached Figure Description

[0011] 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

[0012] 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

[0013] like Figure 1 As shown, this embodiment provides a low-noise synchronous belt pulley. The synchronous belt pulley has anti-slip rings 1 on both sides; the anti-slip rings 1 have protrusions 2 at positions corresponding to the teeth of the synchronous belt; after the synchronous belt is installed on the pulley, the side of the teeth of the synchronous belt contacts the protrusions 2. The protrusions are punched out by sheet metal stamping. When the side edge of the synchronous belt contacts the anti-slip ring, it will first contact the protrusions of the anti-slip ring, thereby reducing the contact area. After the contact area is reduced, the coefficient of friction between the edge of the synchronous belt and the anti-slip ring is reduced; when the coefficient of friction is reduced, the friction force is reduced, and the noise generated by friction is reduced. Example 2

[0014] The low-noise synchronous belt pulley provided in this embodiment has a threaded hole machined at the contact point between the anti-slip ring and the side of the synchronous belt. Then, a protrusion with an external thread is machined using precision machining methods. The height of the protrusion can be 1mm or 2mm. Depending on the width of the synchronous belt, the protrusion of the appropriate height is screwed into the threaded hole of the anti-slip ring to form a fit with the synchronous belt. Taking the pulley for a 130S5M synchronous belt as an example, this synchronous belt has a bandwidth of 13mm. The spacing between the anti-slip rings on both sides of the pulley can accommodate a 15mm bandwidth synchronous belt, typically 19mm. By installing a 1mm high protrusion on this anti-slip ring, the distance between the tops of the protrusions on both sides of the anti-slip ring becomes 17mm, thus adapting to a 13mm synchronous belt. The advantage of this variable width anti-derailment belt is that standard gantry cranes can use narrow-band synchronous belts to reduce costs. When the on-site traction force is insufficient, the pulley can be disassembled and the cam can be replaced. The high cam can be changed to a low cam, so that a wider synchronous belt can be used, enabling convenient on-site modification. Example 3

[0015] This embodiment addresses the slight hard-contact noise generated when the synchronous belt contacts the anti-derailment protrusions during elevator door operator operation. An elastic buffer design is added to the basic protrusion structure, retaining the low-friction noise reduction advantages of point-to-surface contact while eliminating hard-contact impact noise through elastic buffering, making it suitable for high-speed elevator door operator systems. On the surfaces of the anti-derailment rings on both sides of the pulley that contact the synchronous belt, a raised mounting base is integrally formed using sheet metal stamping. The base height is 0.5mm, and a circular groove is formed at the top of the base. An elastic buffer protrusion, made of wear-resistant and highly elastic polyurethane material, is embedded in the groove. The protrusion and groove are fixed with an interference fit. The height of the polyurethane protrusion exposed above the mounting base is available in two specifications: 0.8mm and 1.2mm. The total height of the entire protrusion (base plus elastic portion) adapts to the spacing requirements of synchronous belts with different bandwidths. When the side of the synchronous belt contacts the anti-derailment ring, it first contacts the polyurethane elastic protrusions. The elastic protrusions can undergo slight deformation with the slight oscillation of the synchronous belt, achieving point-to-surface contact to reduce the friction area and coefficient of friction. The elastic deformation also absorbs the impact during contact, avoiding abnormal noise caused by hard metal-to-metal contact. Simultaneously, the low-friction properties of polyurethane further reduce frictional noise between the synchronous belt and the protrusions. This dual noise reduction is suitable for high-speed start-stop applications in elevator door operators. The mounting base is a one-piece stamped metal structure, ensuring structural stability. Worn polyurethane protrusions can be individually removed and replaced, eliminating the need to replace the entire anti-derailment ring and reducing future maintenance costs. Example 4

[0016] This embodiment addresses the problems of traditional dot-shaped protrusions being prone to localized wear and deformation after long-term use, leading to a decrease in noise reduction effect. The protrusions are designed as arc-shaped elongated strips distributed in a ring array, improving their wear resistance and contact stability, making them suitable for elevator door operators operating under high loads and high frequencies. On the annular end faces of the anti-slip rings on both sides of the pulley where they contact the synchronous belt, arc-shaped elongated strip protrusions distributed in a ring array are machined using precision sheet metal stamping. The protrusions extend along the circumference of the anti-slip ring, with a single protrusion having an arc length of 15-20mm, a width of 3mm, and a height of 1mm / 1.5mm. The number of arc-shaped protrusions on the same anti-slip ring is designed according to the pulley diameter. The number of protrusions is ROUNDUP(D / n), where ROUNDUP is a rounding function, D is the diameter of the synchronous belt pulley in millimeters, and n is an integer between 8 and 12. For example, when the pulley diameter is 80-120mm, 8-12 protrusions are used, with a 5mm gap between adjacent protrusions. The arc-shaped elongated protrusions make line-to-surface contact with the side of the synchronous belt (significantly reducing the contact area compared to surface contact). Compared to traditional dot-shaped protrusions, the contact force is more uniform, avoiding wear and deformation of the protrusions caused by localized stress concentration. The ring array distribution ensures that the synchronous belt maintains stable contact with the protrusions as it rotates with the pulley, preventing slight belt misalignment caused by contact gaps. This ensures both anti-derailment performance and maintains a low-friction, noise-reducing state. Furthermore, the stamping process for the arc-shaped protrusions is the same as that for traditional dot-shaped protrusions, requiring no additional processing equipment; production can be achieved simply by adjusting the stamping die. This balances process compatibility and production cost control, making it suitable for mass production. Example 5

[0017] This embodiment addresses the problem of cumbersome installation and removal of existing adjustable height protrusions (threaded type) requiring tools. It adopts a magnetic quick-change structure for the protrusions, enabling tool-free and rapid replacement of protrusions of different heights. This significantly improves the efficiency of on-site commissioning and subsequent maintenance, adapting to the actual operational needs of elevator installation and maintenance. Circular magnetic mounting grooves, 0.3mm deep, are formed on the surfaces of the anti-slip rings on both sides of the pulley in contact with the synchronous belt using sheet metal stamping. A strong permanent magnet is embedded within the groove and sealed with rust-proof adhesive. Magnetic protrusions of different heights are machined to fit the protrusion base, which is made of ferromagnetic metal, and the top is made of wear-resistant engineering plastic (PTFE, low coefficient of friction). The overall height of the protrusions is available in four specifications: 0.8mm, 1mm, 1.2mm, and 1.5mm, to meet the adaptation requirements of synchronous belts with different bandwidths. The magnetic protrusions can be directly adsorbed into the magnetic mounting grooves of the anti-slip rings, enabling tool-free quick installation and removal. The magnetic mounting grooves on the same anti-slip ring are evenly distributed in a ring (20mm spacing) to ensure uniform contact of the protrusions. During on-site installation or maintenance, the corresponding height of the protrusions can be replaced manually according to the actual bandwidth of the synchronous belt, and the spacing of the anti-derailment protrusions can be adjusted without tightening the threads, significantly saving debugging time. Simultaneously, the stability of the magnetic connection meets the vibration requirements of the elevator door operator, preventing protrusion detachment due to door operator start-stop. The low-friction characteristics of the engineering plastic tip combined with the magnetic properties of the ferromagnetic base achieve both noise reduction through point-to-surface contact and ease of installation and disassembly, making it suitable for quick adaptation to different specifications of synchronous belts on-site in elevators.

[0018] 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 low-noise synchronous belt pulley, characterized in that, The synchronous belt pulley has anti-derailment rings on both sides; the anti-derailment rings have protrusions at the corresponding positions of the teeth of the synchronous belt; after the synchronous belt is installed on the synchronous belt pulley, the side of the teeth of the synchronous belt contacts the protrusions.

2. The synchronous belt pulley according to claim 1, characterized in that, The protrusions are punched out using a sheet metal stamping process.

3. The synchronous belt pulley according to claim 1, characterized in that, The protrusion is fixed to the side of the anti-slip ring by means of threads.

4. The synchronous belt pulley according to claim 1, characterized in that, The anti-detachment ring has a raised mounting base integrally formed on the side by sheet metal stamping process. A groove is opened at the top of the mounting base, and an elastic buffer protrusion is embedded in the groove.

5. The synchronous belt pulley according to claim 1, characterized in that, The protrusions are arc-shaped and arranged in a ring array.

6. The synchronous belt pulley according to claim 6, characterized in that, The number of the bumps is ROUNDUP(D / n), where ROUNDUP is the round-up function, D is the diameter of the synchronous belt pulley in millimeters, and n is an integer between 8 and 12.

7. The synchronous belt pulley according to claim 1, characterized in that, The anti-detachment ring has a circular magnetic mounting groove formed by sheet metal stamping, and a permanent magnet is embedded in the mounting groove; the bottom of the protrusion is made of ferromagnetic metal, and the top is made of wear-resistant engineering plastic.

8. The synchronous belt pulley according to claim 3, 4, 5 or 7, characterized in that, The height of the protrusion is adjustable.

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