Novel silent chain and tensioning device thereof

Abstract

The invention discloses a novel silent chain and a tensioning device of the novel silent chain. The novel silent chain is composed of a circular pin silent chain, a driving chain wheel, a driven chain wheel, an upper tensioning guide rail device and a lower tensioning guide rail device. The circular pin silent chain is arranged on the driving chain wheel and the driven chain wheel in a surrounding mode. The upper tensioning guide rail device and the lower tensioning guide rail device are arranged at the upper end and the lower end of the circular pin silent chain correspondingly. The inner side convex tooth profile and the outer side tooth profile of a chain plate are both involute profiles, conjugate engagement between the chain plate and an involute chain wheel is achieved, engagement impact is reduced, stability of silent chain movement is greatly improved, and the silent chain transmission ratio is more accurate. A novel inner and outer composite engagement mechanism is adopted for the chain plate and the chain wheel, and the polygon effect and engagement impact between the chain plate and wheel teeth of the chain wheel are reduced; a combined way of a guide rail box and rollers is adopted for the upper tensioning guide rail device and the lower tensioning guide rail device respectively, the defect that vibration is large before the silent chain is engaged with the chain wheel is overcome through the guide rail boxes, the rollers make rolling contact with the silent chain, and friction force is reduced.

Description

technical field [0001] The invention relates to the technical field of mechanical transmission, in particular to a novel toothed chain and its tensioning device. Background technique [0002] Toothed chain is an important mechanical basic part that is widely used. Especially under the conditions of high speed, heavy load, low noise and large center distance, its transmission performance is better than that of belt drive, gear drive and roller chain drive. It has become one of the preferred transmission forms in many industries. In recent years, various forms of toothed chains have been more and more widely used in agriculture, metallurgy, mining, lifting transportation, ships, automobiles and other fields. Toothed chains can be divided into external meshing, internal meshing and internal-external compound meshing toothed chains according to the different meshing positioning methods. The external meshing and internal and external compound meshing toothed chains are based on ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the above-mentioned existing chain plate has a large impact when meshing with the sprocket, which leads to large vibration of the toothed chain, high noise, and unstable transmission ratio, which eventually leads to a greatly reduced service life of the toothed chain. There is sliding friction between the tensioning device, the guide rail device and the chain plate, which leads to serious wear and tear of the chain plate and guide rail, and the high temperature of the contact surface leads to the degradation of the material performance of the chain plate. A new toothed chain and its tensioning device are provided.

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