Pitch-varying two-sided internal and external composite-meshing silent chain transmission system

Abstract

The invention discloses a pitch-varying two-sided internal and external composite-meshing silent chain transmission system which is mainly composed of a chain, a chain wheel A and a chain wheel B. One side of the chain is in meshed transmission with the chain wheel A, and the other side of the chain is in meshed transmission with the chain wheel B so that transmission of force and torque is achieved. The chain is mainly composed of a plurality of groups of working chain plates, short roll pins, long roll pins and guide pieces, wherein the short roll pins and the long roll pins penetrate through the chain plate holes of the working chain plates to enable the plurality of groups of working chain plates to be connected in a head-to-tail mode, and the guide pieces enable exposed portions located at two ends of two adjacent long roll pins to be fixed. The pitch-varying function of transmission of pitch-varying two-sided internal and external composite-meshing silent chains is achieved, the polygon effect, impact and vibration of the silent chain are remarkably reduced, the abrasion is reduced, and an S-shaped transmission function is achieved. Simultaneously, the pitch-varying two-sided internal and external composite-meshing silent chain transmission system has the advantages of meshing stability of an internal-meshing silent chain and positioning stability of an external-meshing silent chain.

Description

technical field [0001] The invention belongs to the technical field of high-speed chain transmission, and specifically relates to a variable-pitch double-sided internal and external compound meshing toothed chain transmission system suitable for coal machinery, metallurgical machinery, chemical machinery, oil drilling rigs and production process lines. Background technique [0002] Toothed chain drives are widely used in various workplaces that require smooth movement, low noise and high speed, such as automobile engines, coal machinery, oil drilling rigs and other fields. There are many products and specifications of toothed chains, and the application fields are very wide. Generally, toothed chains are divided into internal meshing toothed chains, external meshing toothed chains, and internal and external compound meshing toothed chains according to different meshing mechanisms. [0003] At present, the most common toothed chain in engineering is the external meshing tooth...

AI Technical Summary

Problems solved by technology

Due to the polygonal effect of the chain drive, the pitch line of the toothed chain with an external meshing mechanism is alternately cut or tangent to the pitch circle of the sprocket, and the position of the center line of the chain changes periodically. It will produce large impact vibration and noise during movement, which will seriously affect the performance of the engine

[0004] Most of the toothed chain transmissions in the prior art are single-sided meshing, which cannot be applied to multi-axis systems that require S-shaped transmissions, such as coal, petroleum machinery, and production process assembly line transmission systems.

Moreover, the pins of the traditional toothed chain drive are mostly round pins. This toothed chain does not have the function of variable pitch and cannot effectively reduce the polygonal effect of the toothed chain drive. The noise is large, the wear is serious, and the motion accuracy is poor.

[0005] The Chinese patent application number 200710016227.5 discloses a high-speed transmission toothed chain with an internal and external compound meshing mechanism, but this toothed chain can only achieve single-sided meshing, and cannot be applied to multi-axis systems that require S-shaped transmission; application The Chinese patent No. 200810128556.3 discloses a double-sided meshing toothed chain, but the adjacent chain links are connected by a single round pin, which cannot realize the variable pitch function of the toothed chain transmission. Therefore, the toothed chain transmission Polygonal effect, large shock and vibration, severe wear, high noise, poor fatigue durability

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