TM 282 Friction in journal bearings
There a many factors that influence the friction states in a hydrodynamic journal bearing. Speed, load and viscosity of the lubricant used are focused on in particular.
TM 282 allows the study of various factors that influence friction. The journal bearing comprises an electrically driven shaft journal that rotates in a freely movable bearing housing. The movement of the oil in the bearing can be observed.
The applied load is transmitted to the bearing housing through a load application device and can be varied by means of weights. The frictional moment is determined by means of a movable weight that balances the moment on a balance beam. The journal is driven by an electric motor at a speed that can be adjusted by a frequency converter. The temperature (and therefore the viscosity) of the lubricant is recorded by a temperature sensor in the bearing shell and shown on a screen on the display and control unit. The lubricant is supplied via a wick oiler that applies the oil via two grooves in the bearing bush. The accumulated leakage oil is collected in a collecting tank.
- fundamentals of hydrodynamic lubrication
- friction states under different operating conditions
- electronic speed control and digital display of speed and lubricant temperature
Journal bearing
- shaft diameter: Ø=30mm
- bearing width: 45mm
- friction pair: steel/bronze
Motor: 0,37kW
Oil viscosity grade: ISO VG 32
Weights
- 1x 50N, 1x 20N, 2x 10N, 2x 5N, 2x 5N
- lever transmission ratio: 5:1
Measuring ranges
- temperature: -50…200°C
- speed: 100…3000min-1
- bearing load: max. 525N
- friction moment: max. 295Nmm
230V, 50Hz, 1 phase
230V, 60Hz, 1 phase; 120V, 60Hz, 1 phase
UL/CSA optional
- investigation and visualisation of hydrodynamic bearing
- radial journal bearing with stainless steel journal and freely movable bronze bearing shell
- drip lubrication for continuous supply of lubricant (drip oiler)
- journal bearing subjected to load by means of mechanical lever
- variable speed via frequency converter
- frictional moment measured by level with sliding weight
- inductive speed measurement
- thermocouple in the bearing housing to measure the oil temperature
- display and control unit with digital displays for oil temperature and speed
- develop an understanding of technological relationships of hydrodynamic lubrication by experimentation
- frictional moment in a journal bearing as a function of
- speed
- bearing load
- lubricant and lubricant temperature