There have not been any papers evaluating the load distribution in stern tube bearings, because the supporting condition and external forces, such as overhanging weights and hydro-dynamic forces of propeller, are very complicated. The authors have established a computing method to evaluate the load distribution by using the deflection curve of propeller shaft and supporting force, which were calculated by continuous beam theory applied to the shafting system. In this method, the stern tube bearing consists of several divided pieces supported at their centers by non linear springs, respectively. Evaluations were carried out under several designing conditions on a ship installed with lignamvitae stern tube bearing, with these results: (1) Bearing pressure is about 25 kg/ at the after end of the stern tube bearing, taking account of weight of shafting and assuming that alignment of shaft is straight. (2) When the shafting is subjected to external force and moment at the position of propeller, the bearing pressure of stern tube and deflection of shaft in stern tube show remarkable change. But the influence of the external force and moment is negligible in the vicinity of the aftermost plumber block. (3) Designing devices to incline the bearing surface along the deflection curve of shaft and to support the bearing elastically are effective to decrease the local pressure of the bearing. It is presumed that the length of stern tube bearing may be shortened by these devices.

  • Corporate Authors:

    Society of Naval Architects of Japan

    23 Shiba-kotohiracho, Minato-ku
    Tokyo 135,   Japan 
  • Authors:
    • Washimi, R
    • Iida, S
  • Publication Date: 1970

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Filing Info

  • Accession Number: 00035201
  • Record Type: Publication
  • Source Agency: Society of Naval Architects of Japan
  • Files: TRIS
  • Created Date: Oct 27 1974 12:00AM