A low-speed high-power marine engine timing chain

Abstract

The invention relates to a low-speed high-power marine engine timing chain which comprises inner chain links and outer chain links. Each inner chain link is formed in the manner that inner link platesand sleeves are in interference fit and the sleeves and rollers are in clearance fit, each outer chain link is formed in the manner that outer chain plates and pin shafts are in interference fit, andthe inner chain links and the outer chain links are staggered and embedded with each other to form the whole chain through clearance fit of the pin shafts and the sleeves. In each inner chain link, one side of each chain plate is provided with an engaged circular bead, and wear and impact generated by the chain and a sprocket can be avoided; and each sleeve is designed to be of a tapered structure and adopts a honing process after assembling, and therefore the effect of radial shrinking generated by interference fit on the wear resistance of the chain is avoided. The chain adopts an octagonalriveting method, the chain length is detected on the basis of 10-20 links in the initial stage of chain assembly, whole chain connection is carried out in the manner that the chain lengths of reference chain segments are gradually increased from the two sides to the middle, and the using performance of the large-size chain at low-speed heavy-loaded conditions is improved.

Description

Technical field [0001] The invention relates to the technical field of chain transmissions, in particular to a low-speed high-power marine engine timing chain. Background technique [0002] At present, the chain drive system has been extremely widely used in engine timing transmission, especially in low-speed and high-power marine engines. Different from general chains, the reliability, fatigue performance and wear resistance of marine engine timing chains are more demanding. [0003] Due to the corresponding improvements in materials and heat treatment of large-size chains, the fatigue performance can generally meet the needs, but the wear resistance is far from the advanced level of foreign countries. The main reason is that the impact of the diameter reduction caused by the sleeve interference fit on the pin shaft and even the entire chain is not considered. The effect is not satisfactory only by increasing the hardness of the sleeve or pin shaft. In the actual operation of th...

AI Technical Summary

Problems solved by technology

The main reason is that the influence of the radial shrinkage caused by the interference fit of the sleeve on the pin shaft and even the entire chain is not considered. It is only improved by increasing the hardness of the sleeve or pin shaft, and the effect is not ideal.

During the actual operation of the chain, the friction of the shaft sleeve in conventional line contact is transformed into friction between the drum-shaped sleeve and the pin shaft, which intensifies the mutual wear of the parts, causing the chain to elongate beyond the range and fail

In addition, during the meshing process of the chain and the sprocket, due to load fluctuations, the inner chain plate and the tooth surface of the sprocket may interfere, causing the sprocket to be worn to varying degrees and affecting the normal meshing

Therefore, conventional chain design methods or processes can no longer fully meet the requirements of marine engine timing chains

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