On Cavitation Destruction of the Antifriction Layer In Sliding Bearings of Diesels

摘要

The effect of oil viscosity on the intensity of cavitation destruction of the antifriction layer of sliding bearings is studied. The work was done because this damage is a leading cause of failure of crankshaft bushings in locomotive diesel engines. Specimens of ASM aluminum and B 83 babbitt were tested with Dp 11 and Ms 20 oils with a 50 to 50 mix ture of these oils. The aluminum was tested for 4 hrs and the babbitt for 2 hrs at a constant temperature of 60 degrees centigrade on a vibration stand. The intensity of cavitation destruction was determined by weight loss and by depth of damage. Because it is more plastic, the babbitt was found to have a considerably higher rate of cavitation destruction than the aluminum. It was found that the rate of cavitation destruction can be reduced by increasing the viscosity of the lubricating oil and by increasing the smoothness of the bearing and shaft surfaces.