In hydrodynamic bearings, a supporting lubricating film separates the shaft from the bearing shell during operation. The pressure within this lubricating film in hydrodynamic journal bearings is created by the relative motion between the bearing shell and the shaft. For analyzing the tribological process within a journal bearing, the shaft’s position relative to speed and load is crucial.
This trainer facilitates the study of a radially lubricated journal bearing with hydrodynamic lubrication. It includes five shafts of varying diameters to examine operating behavior as a function of bearing clearance. A hand wheel applies radial load to the journal bearing, which is electronically measured. The frictional moment is also measured using a force sensor. A three-phase motor drives the shaft, with speed continuously adjustable via a frequency converter and displayed digitally. The oil temperature is controlled by a separate controller. Inductive sensors measure the shaft’s relative motion within the bearing, enabling the plotting of its path based on load and speed.
Position measurements are averaged and displayed at four points on the shaft in both the X and Y directions. Additional sensors measure and display oil temperature, oil pressure, and peak oil pressure in the bearing. Measured values are shown on digital displays and can be transmitted via LAN/USB to a PC for data analysis using optional software.
Experiments:
- Determine the coefficients of friction at different loads and speeds, and compare them with Stribeck curves
- Analyze the impact of speed, bearing clearance, and bearing load on shaft displacement
- Effect of speed, bearing clearance, bearing load, and lubricant on the frictional moment
- Finding Trajectory (locus) of the shaft
Specification:
- Friction states in hydro-dynamically lubricated journal bearings
- Five shafts of varying diameters for experiments with different bearing clearances
- Shaft powered by a three-phase motor with a frequency converter for continuous speed adjustment
- Controller for regulating oil temperature
- Measure the frictional moment using a lever arm with a force sensor
- Radial load applied to the bearing using a joint and threaded spindle with a hand wheel, and measured with a force sensor
- Eight inductive displacement sensors for measuring shaft displacement
- Digital displays for radial load, frictional moment, shaft position (X and Y directions), oil pressure, peak oil pressure, oil temperature, and speed
- Optional software for data acquisition via LAN/USB compatible with Windows 10 or higher
