• Learning the technological correlations involved in hydrodynamic lubrication by experimentation.
  • Frictional force in a journal bearing dependent on
    • Materials
    • speed
    • bearing load
    • lubricant and lubricant temperature


  • Unit to investigate basic tribology topics.
  • Radial journal bearing with stainless steel shaft journal and free-moving sintered bronze, Cast Iron and Teflon bearing shells.
  • Three-phase AC motor with variable frequency drive for speed control.
  • Load applied to journal bearing using a sprig balance.
  • Measurement of friction moment achieved through the use of a lever with force gauge.
  • Drip-feed lubrication for continuous lubricant supply (drip-feed lubricator).
  • Drip tray for leakage oil.
  • Inductive speed sensor.
  • Digital display of speed and also it can be varied by using variable frequency drive.

In this apparatus a journal bearing study can be investigated of a stainless steel shaft journal and the free-moving sintered bronze, Cast Iron and Teflon bearing housing. The tribology phenomena of journal bearings can be investigated using this apparatus. A three-phase AC motor with a variable frequency drive for speed control serves as the drive. Force on bearing can be applied using the tnurled screw at the top with the help of two spring balance. This allows the user to measure the friction moment generated in the bearing. The lever, combined with a set of weights, applies the defined load to the bearing. It is possible to view the bearing journal and the lubrication gap.

Lubricant is supplied by a drip-feed lubricator that feeds oil to the shaft via lubrication channel. A drip tray collects the oil that leaks out. The continuously adjustable speed, as well as the temperature of the lubricant, is indicated digitally on the panel.

The detailed instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.