船舶用滑車の効率について

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Many kinds of marine cargo blocks have been used as the cargo handling equipments of vessels, but it has been found very difficult to estimate their correct efficiency at the designing stage, mainly for lack of available experimental data on them. In order to obtain their data the present authors have carried out several experimental investigations on some kinds of cargo blocks, and obtained the follwing results. (a) For steel cargo blocks: 1) The cargo blocks improves slightly in their efficiency with the increase of the lifting load. 2) The efficiency did not vary practically even when alterations were made in the angle of the wire ropes. 3) As far as the present experiment is concerned, slight changes in the efficiency take place depending on the size of the sheave diameter of the cargo block. 4) In the case of thec argo block provided with a bush and without snatch blocks, the efficiency was in the range of 0.89-0.93 or so, but cargo blocks provided with roller bearings showed values about 5% better. 5) Among the cargo blocks provided with roller bearings, the double row type was slightly better than the single row type. 6) In the case of the cargo blocks provided with a bush and without snatch blocks, the friction coefficient μ between the sheave and the shaft of cargo block was found to be in the range of 0.21-0.36, which are fairly large values as compared with the friction coefficient generally assumed. This is, presumably, the reason why the efficiency of the cargo block showed lower values in the present experiment than those employed empirically heretofore. With respect to the cargo block provided with roller bearing, the friction coefficient μ was found to be in the range 0.05-0.15. (b) The efficiency of wooden cargo blocks lays in 0.90-0.96.
社団法人日本船舶海洋工学会の論文
1961-03-31

船舶用滑車の効率について

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