About
This bearing evaluation tool uses common wear analysis methods covered in the "Handbook of Tribology Volume II, Edited by: Robert W. Bruce, 2012".
The results are not a substitute for actual testing, but provide a guide to keep sleeve bearing applications within a reasonable design range. The wear life estimate provides a guide to screen applications under ideal conditions.
|
Shafting
Shafting is assumed to be smooth, approximately RA 32 micro-inch or better, hard (HRC>10) carbon or stainless steel |
Lubrication
Bearings are assumed to be "dry". Wear estimates are based on the properties of the selected material against rotating shafting. Self lubricating materials will generally out perform normal materials without lubrication |
|
Bearing materials
Properties are available for the materials used in our in our sleeve bearing products and a wide range of common alternative bearing materials for comparison. Bearing materials should not only be evaluated for basic wear performance, but also for thermal, mechanical and corrosion resistance properties.
|
Bearing material limits
Review information about the bearing materials under sleeve bearings to determine if the conditions are suitable for the selected material in the estimate.
Vibration, abrasive media, damaged shafting, excessive temperature, vacuum, shock loading, chemicals and loads exceeding the allowable PV limits will increase bearing wear rates. The proper bearing material will minimize the effects of the various stresses.
|
Service temperature and fiction heating
If the actual service temperature environment of the bearing is known, an idea of the risk to bearing performance can be inferred such as melting, excessive softening or thermal oxidation. An average bearing temperature from friction heating based on the materials dynamic coefficient of friction and shaft RPM is estimated.
If the material's service temperature range is exceeded a warning will be given to the user. The estimate assumes that most of the heat generated by friction is carried away by the shaft, and does not consider design variables such as immersion in water, grease/oil lubrication, or other high convection environments that stabilize bearing temperature.
|
Nominal Shaft Ø
By selecting the nominal shaft diameter from the menu, the shaft diameter and bearing length are automatically populated into the calculation using
HTB's standard self-aligning mounted sleeve bearing dimensions (excludes stamped steel bearing inserts and other specialty inserts). User specified bearing sizes can be input by checking the "Custom Dimensions" box.
|