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14:50 / 13.04.2021
printable version Hydrodynamic bearing
 
Hydrodynamic bearing
The hydrodynamic bearing is such a fundamental machine element, that every student should have knowledge about it. This bearing competes with the ball bearing, but the advantages are obvious. Though we meet the hydrodynamic bearing foremost in its cylindrical form, a suitable way to learn about it is the plate form.

The model uses a belt drive that submerges downtrum into an oil reservoir . So transports oil on its surface. Upside a plate is placed which can be inclined and the distance to the belt adjusted. Above the plate a number of glas tubes is arranged having connection with the oil film via small bores. The tubes are graduated so is readable the pressuredistribution of the oilfilm.

 
Hydrodynamic bearing

Parameters which define the portability of the bearing are:

  • inclination angle of the plate
  • thickness of the oilfilm
  • Relative speed
  • viscosity of the oil (often a function of temperature)
 
Hydrodynamic bearing

Attributes of the device:

  • lubrication wedge formed under a plane plate
  • pressure measurement as "oilcoloumn"
  • pressure distribution via 13 bores in the plate
  • variable relativ speed
  • adjusting of the distance and inclination
  • very accurate via excenters and dial gauges
  • device protected agains dirt invasion and oil sprue
 
These relations are determined erperimentally with the device.
 
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