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A STUDY OF THE LOADS ACTING ON THE BEARINGS OF THE ON-BOARD WATER PUMP OF THE MARINE DIESEL M50

Experimental measurements were made and then correlated with calculations of the pressures and stresses in the water pump of the M50 marine diesel. Dynamic studies were conducted to determine the stresses in the shaft and in thrust bearings by using signals from a 10-mm wire strain gauge, recorded on an N-107 oscillograph. Radial, axial, and rotary forces were applied, but only the radial ones (R) were found significant. A graph of R versus engine rpm shows that R rose from 100 to 220 kg over the operating range. Manometric pressure measurements showed a pressure of 2.4 kg/cm squared in the circular channel with a pressure of 1.5 kg/cm squared in the pump channel. The pressure in the water ring eccentric to the pump wheel axis is assumed to grow linearly along the length of the channel, starting at zero at the intake and rising to a maximum at the end. With this assumption, the calculated force acting on the wheel should be 166 kg, but the measured force was 236 kg. This indicates that a correction factor of 1.4 must be applied to calculated forces. By using this method, only a single pressure measurement is needed or an assumption that the maximum pressure is 2 1/2--3 times the pump channel pressure may be made to conduct the calculations. On the basis of this study the bearings in the M50 water pump were replaced by more efficient bearings with a longer lifetime.

  • Authors:
    • Miselev, M A
    • Rasputnis, A I
    • Petrov, N P
    • Shustorovich, YaA
  • Publication Date: 1968

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Filing Info

  • Accession Number: 00014984
  • Record Type: Publication
  • Source Agency: Joint Publications Research Service
  • Files: TRIS
  • Created Date: May 7 1973 12:00AM