Mute chain wheel with buffer ring

Abstract

The invention relates to the technical field of silent chain wheels, in particular to a silent chain wheel with a buffer ring, which comprises a chain wheel body and the buffer ring, the chain wheel body comprises a chain wheel body positioned in the middle and a plurality of chain wheel teeth integrally connected to the peripheral surface of the chain wheel body and uniformly distributed; each chain wheel tooth is provided with a mounting groove which is formed in the circumferential direction of the chain wheel body and penetrates through the two sides of the chain wheel tooth, the multiple mounting grooves are combined to form a containing space used for containing a buffer ring, an elastic framework is arranged in the buffer ring, and an elastic buffer material is arranged outside the buffer ring. The invention discloses a mute chain wheel with a buffer ring, the buffer ring is designed at a tooth space meshing center of the chain wheel, and the outer diameter of the buffer ring is 3%-4% larger than the diameter of a bottom circle of a chain wheel tooth. When the chain roller is meshed with the chain wheel, the buffering ring arranged in the chain wheel is in contact with the roller to absorb and disperse most impact, and therefore noise generated when a chain system operates is lowered.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of silent chain wheel, in particular to a silent chain wheel with a buffer ring. BACKGROUND

[0002] Chain system is one of the common transmission elements in the field of mechanical transmission, which mainly transmits power and motion through the meshing between chain wheel teeth and chain links, and has many advantages such as high load capacity, accurate transmission ratio, high transmission efficiency, strong environmental adaptability, compact structure and the like. It is commonly used in motorcycles, bicycles, engineering machinery, precision manufacturing machinery and the like. The noise generated by these chain systems during operation is a common and important problem, which seriously affects the user experience (such as the comfort of riding) and the working environment.

[0003] The main source of chain system noise is the meshing between the tooth groove of the chain wheel and the roller or sleeve of the chain. During the meshing process of the chain and the chain wheel, an impact of meshing is generated due to the polygon effect, which is first borne by the roller and then transmitted to the sleeve, pin shaft and other chain components. Therefore, it is inevitable to generate noise during the operation of the chain. The current noise reduction technology of chain wheel mainly wraps a layer of high-elasticity and high-wear-resistance rubber or polyurethane (PU) on the surface of the metal chain wheel teeth. During the meshing moment, the rubber will deform, absorb and disperse most of the impact energy. It converts the sharp and instantaneous impact force into a relatively flat and slightly longer force, greatly reducing the strength of the impact and the noise generated. The current technology can effectively suppress the noise generated during the operation of the chain system, but in high-speed, heavy-load or high-temperature environments, the durability and wear resistance of the rubber material are poor, which may cause the rubber to wear out, fall off or performance degradation. SUMMARY

[0004] The present application discloses a silent chain wheel with a buffer ring. The chain wheel is designed with a buffer ring at the center of the tooth groove meshing. The outer diameter of the buffer ring is 3%-4% larger than the diameter of the chain wheel tooth bottom circle. When the chain roller meshes with the chain wheel, the built-in buffer ring of the chain wheel contacts with the roller to absorb and disperse most of the impact, thereby reducing the noise during the operation of the chain system.

[0005] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows: A silent chain wheel with a buffer ring, comprising: a chain wheel body and a buffer ring, the chain wheel body comprises a chain wheel body located in the middle and a plurality of chain wheel teeth integrally connected to the outer circumferential surface of the chain wheel body and uniformly distributed, each chain wheel tooth is provided with a mounting groove penetrating through both sides of the chain wheel tooth along the circumferential direction of the chain wheel body, and a plurality of mounting grooves are combined into a containing space for containing the buffer ring, the buffer ring is internally provided with an elastic skeleton and externally provided with an elastic buffer material.

[0006] Preferably, the mounting slots have the same structural dimensions, the bottom surfaces of the mounting slots form the inner ring limiting surface of the accommodating space, and the top surfaces of the mounting slots form the outer ring limiting surface of the accommodating space.

[0007] Preferably, the elastic skeleton is made of steel, and the elastic cushioning material is composed of POM composite material.

[0008] Preferably, the inner diameter φd of the buffer ring is greater than the diameter φd1 of the inner ring limiting surface, and the outer diameter D of the buffer ring is smaller than the diameter φD1 of the outer ring limiting surface.

[0009] Preferably, when the sprocket body and the chain drive, the buffer ring within the wrap angle range of the chain and the sprocket is pressed against the inner ring limiting surface by the chain rollers, and the other side of the buffer ring elastically deforms outward.

[0010] Preferably, when the sprocket body and the chain drive, when the outermost roller within the wrap angle range of the chain and the sprocket presses the buffer ring against the inner ring limiting surface, the buffer ring body that elastically deforms to the other side constitutes a buffer guide structure for the roller to enter the meshing state with the sprocket or for the roller to move away from the meshing state with the sprocket.

[0011] Preferably, the outer diameter of the buffer ring is 3%-4% larger than the diameter of the bottom circle of the sprocket teeth.

[0012] Preferably, the diameter of the sprocket tooth bottom circle is df, the outer diameter of the buffer ring is D, and the inner diameter is φd. The maximum diameter φd1 of the inner ring limiting surface is: df-(D-φd), and the maximum diameter of the outer ring limiting surface is ΦD1=sprocket pitch circle diameter / 1.01326.

[0013] Preferably, one side of the receiving space extends through the root of the sprocket tooth on the same side and forms an annular mounting groove for the buffer ring to be installed into the receiving space.

[0014] The silent sprocket with a buffer ring of the present invention has the following beneficial effects: 1. This invention effectively reduces the impact noise generated when the sprocket and chain mesh. The sprocket of this invention is universally compatible with existing bushing roller chains and oil-sealed roller chains. The sprocket incorporates a POM composite rigid buffer ring to mitigate impact and reduce noise.

[0015] 2. The buffer ring of the present invention can be replaced or removed for repair after it fails, which further extends the service life of the silent sprocket.

[0016] 3. When the sprocket of the present invention is used in conjunction with the chain, it can not only reduce meshing noise, but also constrain the running trajectory of the chain to a certain extent, making the chain run more smoothly and providing buffer before entering the meshing state, thereby further improving the noise reduction effect.

[0017] 4. The buffer ring of the present invention has a built-in elastic steel frame to avoid problems such as deformation, breakage, and detachment of the buffer ring after long-term use. Attached Figure Description

[0018] Figure 1 : Schematic diagram of the main structure of the invention; Figure 2 : Schematic diagram of the present invention after AA sectioning; Figure 3 : Schematic diagram of the main body of the chain system of this invention; Figure 4 : Schematic diagram of the elastic deformation of the buffer ring under force in this invention; Figure 5 : Partial cross-sectional view of the buffer ring; Figure 6 : Annular mounting groove for the buffer ring.

[0019] Markings in the diagram: 001, Annular mounting groove; 01, Sprocket body; 011, Outer circumferential surface of the sprocket body; 012, Outer ring limiting surface; 013, Inner ring limiting surface; 014, Sprocket rotation direction; 02, Buffer ring; 021, Elastic skeleton; 022. Elastic cushioning material; 023. Elastic deformation of the other side of the buffer ring; 024. The buffer ring within the wrap angle range is pressed against the inner ring limiting surface by the chain rollers; 03. The outermost roller within the wrap angle range; 031. The outermost roller adjacent to the outermost roller within the wrap angle range; 032. The outermost roller adjacent to the outermost roller within the wrap angle range; 04. Chain; 041. Chain running direction; 042. Loose side area; 043. Tight side area; 05. Mounting groove; T is the width of the mounting groove; D is the outer diameter of the buffer ring; φd is the inner diameter of the buffer ring; t is the thickness of the buffer ring; φD1: outer ring limiting surface diameter, φd1 inner ring limiting surface diameter. Detailed Implementation

[0020] The following description provides a detailed explanation of the embodiments of the present invention in a step-by-step manner. This description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0021] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limiting this invention.

[0022] Example 1: A silent sprocket with a buffer ring, such as Figure 1 , 2 As shown, it includes: a sprocket body 01 and a buffer ring 02. The sprocket body 01 includes a sprocket body located in the middle and a plurality of sprocket teeth integrally connected to the outer peripheral surface 011 of the sprocket body and evenly distributed. Each sprocket tooth is provided with a mounting groove 05 along the circumference of the sprocket body and penetrating both sides of the sprocket tooth. The plurality of mounting grooves 05 are combined to form a receiving space for accommodating the buffer ring 02. The buffer ring is provided with an elastic skeleton 021 inside and an elastic buffer material 022 outside.

[0023] like Figure 1 , 2 As shown, several mounting slots 05 have the same structural dimensions. The bottom surfaces of several mounting slots 05 form the inner ring limiting surface 013 of the accommodating space, and the top surfaces of several mounting slots 05 form the outer ring limiting surface 012 of the accommodating space. The buffer ring is constrained between the inner ring limiting surface and the outer ring limiting surface.

[0024] In this embodiment, the buffer ring is fitted into the space with a clearance fit. It contacts the rollers of the chain through the elastic buffer material, thereby reducing the impact of collision and thus reducing noise. Meanwhile, the present invention provides another form of constraint between the buffer ring and the receiving space, which is detailed in the following embodiments.

[0025] Example 2: like Figure 5 As shown, the elastic skeleton 021 is made of steel with a certain degree of elasticity, and the elastic buffer material 022 is composed of POM composite material. The elastic skeleton 021 is a circular, closed-loop part obtained by processing spring steel sheet using existing stamping processes. The elastic skeleton 021 is then placed in a special injection mold, and molten POM material is injected, causing the POM material to wrap around the elastic skeleton 021. After cooling, the molded part is obtained. The external dimensions of the POM composite material are controlled by the injection mold. The purpose of this design is that the built-in elastic skeleton 021 in the core of the buffer ring improves the overall elasticity and strength of the buffer ring, ensuring its service life. The external wrapping with POM composite material buffers the secondary impact noise generated when in contact with the chain rollers, and the self-lubricating properties of the POM composite material also solve its own frictional loss.

[0026] Example 3: like Figure 2As shown, the inner diameter φd of the buffer ring is larger than the diameter φd1 of the inner ring limiting surface, and the outer diameter D of the buffer ring is smaller than the diameter φD1 of the outer ring limiting surface. This design allows the buffer ring to undergo elastic deformation when compressed by the rollers. This deformation, along with the reduction of meshing noise through the elastic buffer material 02, provides buffering guidance for the chain entering or leaving the meshing state with the sprocket, thus making the chain's running trajectory controllable and stable, achieving further noise reduction.

[0027] like Figure 3 , 4 As shown, when the sprocket body 01 and the chain 04 are driven, the ring body of the buffer ring within the wrap angle range of the chain 01 and the sprocket is pressed by the chain rollers onto the inner ring limiting surface 024, and the other side of the buffer ring elastically deforms outward 023.

[0028] Furthermore, such as Figure 4 As shown, when the sprocket body 01 and the chain 04 are driven, when the outermost roller 03 within the wrap angle range of the chain 01 and the sprocket presses the buffer ring 02 against the inner ring limiting surface 013, the buffer ring body that elastically deforms to the other side constitutes a buffer guide structure for the roller to enter the meshing state with the sprocket or for the roller to move away from the meshing state with the sprocket.

[0029] It should be noted that, Figure 3 , 4 To facilitate observation of the mechanical structure of this invention, the chain is opened outwards to a certain extent. In actual operation, the outermost roller (031 or 032) adjacent to the outermost roller 03 within the wrap angle range contacts the deformed and expanded buffer ring. This causes the roller to enter or leave the meshing state with the sprocket under the guidance of the deformed buffer ring body, thereby constraining the running trajectory of the chain to a certain extent and making the chain run in a more stable posture. Buffering begins when not meshing with the sprocket, and similarly, buffering is also provided when leaving the meshing state with the sprocket, thereby further reducing transmission noise.

[0030] like Figure 2 As shown, the part of the buffer ring that undergoes elastic deformation provides a reaction force to the buffer ring by contacting the outer ring limiting surface.

[0031] Example 4: The outer diameter of the buffer ring is 3%-4% larger than the diameter of the bottom of the sprocket teeth (bottom of the tooth groove). The thickness t of the buffer ring 02 and the groove width T of the mounting groove 05 satisfy: T=0.1mm+t.

[0032] Example 5: Let the diameter of the sprocket tooth root circle be df, the outer diameter of the buffer ring be D, and the inner diameter be φd. The maximum diameter φd1 of the inner ring limiting surface is: df-(D-φd), and the maximum diameter of the outer ring limiting surface is ΦD1=sprocket pitch circle diameter / 1.01326.

[0033] Example 6: like Figure 6 As shown, one side of the accommodating space passes through the root of the sprocket tooth on the same side and forms an annular mounting groove 001 for installing the buffer ring into the accommodating space.

[0034] In this embodiment, the buffer ring is installed into the receiving space from the annular mounting groove 001. Because the buffer ring itself is elastic, after being inserted into the receiving space, it is elastically reset and constrained within the space, preventing it from falling off. When the buffer ring is damaged, it can be replaced or removed for repair, significantly improving the service life of the silent sprocket. Simultaneously, the root of the sprocket tooth connecting to the sprocket body is thickened to ensure the structural strength of the sprocket tooth itself.

[0035] It should be noted that the sprocket body involved in this invention covers all roller chain sprockets, including but not limited to ISO tooth profile, three-circular-arc straight-line tooth profile, two-circular-arc straight-line tooth profile, one-circular-arc straight-line tooth profile, and involute tooth profile sprockets.

Claims

1. A silent sprocket with a buffer ring, characterized in that, include: The sprocket body includes a central sprocket body and a plurality of sprocket teeth integrally connected to the outer circumferential surface of the sprocket body and evenly distributed thereon. Each sprocket tooth is provided with a mounting groove along the circumference of the sprocket body and penetrating both sides of the sprocket tooth. The plurality of mounting grooves are combined to form a receiving space for accommodating the buffer ring. The buffer ring has an elastic skeleton inside and an elastic cushioning material on the outside.

2. A silent sprocket with a buffer ring as described in claim 1, characterized in that, Several mounting slots have the same structural dimensions. The bottom surfaces of several mounting slots form the inner ring limiting surface of the accommodating space, and the top surfaces of several mounting slots form the outer ring limiting surface of the accommodating space. One side of the accommodating space passes through the root of the sprocket tooth on the same side and forms an annular mounting slot for installing a buffer ring into the accommodating space.

3. A silent sprocket with a buffer ring as described in claim 2, characterized in that, The elastic skeleton is made of steel, and the elastic cushioning material is composed of POM composite material.

4. A silent sprocket with a buffer ring as described in claim 3, characterized in that, The inner diameter φd of the buffer ring is greater than the diameter φd1 of the inner ring limiting surface, and the outer diameter D of the buffer ring is smaller than the diameter φD1 of the outer ring limiting surface.

5. A silent sprocket with a buffer ring as described in claim 4, characterized in that, When the sprocket body and the chain drive, the buffer ring within the wrap angle range of the chain and the sprocket is pressed against the inner ring limiting surface by the chain rollers, and the other side of the buffer ring elastically deforms outward.

6. A silent sprocket with a buffer ring as described in claim 5, characterized in that, When the sprocket body and the chain drive, when the outermost roller within the wrap angle range of the chain and the sprocket presses the buffer ring against the inner ring limiting surface, the buffer ring body that elastically deforms to the other side constitutes a buffer guide structure for the roller to enter the meshing state with the sprocket or for the roller to move away from the meshing state with the sprocket.

7. A silent sprocket with a buffer ring as described in claim 6, characterized in that, The outer diameter of the buffer ring is 3%-4% larger than the diameter of the bottom circle of the sprocket teeth.

8. A silent sprocket with a buffer ring as described in claim 7, characterized in that, wherein... The diameter of the sprocket tooth root circle is df, the outer diameter of the buffer ring is D, the inner diameter is φd, the maximum diameter of the inner ring limiting surface φd1 is: df-(D-φd), and the maximum diameter of the outer ring limiting surface is ΦD1=sprocket pitch circle diameter / 1.01326.

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