Influences of taper geometry modified oil-grooves on load carrying capacity of crosshead bearings

Tatsumi Kitahara, Masaru Otsubo, Daisuke Nakahara

研究成果: ジャーナルへの寄稿学術誌査読

抄録

The crosshead bearing in large two-stroke diesel engines operates under severe lubrication conditions, because the bearing oscillates within a small angle at a low speed and is always subject to a high downward load. The recent trend towards more compact engines with increased output raises the bearing specific load, thereby causing the lubrication severity to increase significantly. Thus it is very important to improve the load carrying capacity of the crosshead bearing. In the present study, experiments using a dynamically loaded bearing seizure test apparatus were carried out to clarify the influences of the clearance ratio and the oil-groove geometry on the load carrying capacity. The electrical resistance of the oil film was also measured to evaluate the extent of the oil film formation. The major results are: (1) A decrease in the clearance ratio is effective in enhancing squeeze action on the entirety of the bearing pads, thereby improving the load carrying capacity. When the clearance ratio becomes too low, however, the ability to form an adequate wedge film is degraded, causing the load carrying capacity to decrease; (2) A significant improvement in the load carrying capacity can be expected, because incorporating the taper geometry on both sides of the oil-groove promotes a thicker oil film; and (3) A taper geometry with a subtended length of 5 degrees and a taper angle of 0.1 degree produces the maximum load carrying capacity.

本文言語英語
ページ(範囲)618-624
ページ数7
ジャーナルJSME International Journal, Series C: Mechanical Systems, Machine Elements and Manufacturing
49
2
DOI
出版ステータス出版済み - 12月 15 2006

!!!All Science Journal Classification (ASJC) codes

  • 機械工学
  • 産業および生産工学

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