On the Lubrication of Crosshead-Pin Bearing with Eccentric Journal : Analysis for the Case with both Eccentric Journal and Bearing

概要

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This paper refers to a theoretical study on the lubrication of a crosshead-pin bearing specially equipped with an eccentric journal in a 2-stroke cycle diesel engine. From the analyses of the journal center locus and the oil-film pressure distribution it is clarified that the main and the eccentric bearing surfaces bear the load alternately and facilitate the oil-feed from the circumferential oil-groove to each surface in unloaded period, and that the load carrying capacity is greatly improved. The following optimums for design become evident. (i) The offset ratio is preferably large without exceeding the limit determined by the load carrying capacity. (ii)The ratio of the radial clearance to the radius is as small as possible. (iii) The width of the main segment is preferably large in the range 65 ~ 75% of the whole bearing. (iv) The effective circumferential angel and the ratio of the width to the diameter are as large as possible.
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