Plain Bearings Requirements and Tests

Hi marcorecchioni

If you refer to hydro dynamic radial journal bearing's (bushes with lubrication holes or grooves) calculation for your application, DIN31652 is a good method for small and average speed. Also NIEMANN provides a very accurate method.

The ISO4379:1993 describes basic sizes and types. For quality control techniques and inspection of the geometrical and material quality characteristics, see ISO12301.

lgeo

Normally you can find this information from the bearing supplier catalogue. I would recommend you to consult any bearing supplier because somtime it is not that simple to choose the right bearing. But for general selection, you need to first consider the bearing PV value which is compute by (rotation speed x pressure). The PV value for different bearing material varies. It is related to the heat generation from the bearing. You don't want the bearing to overheat.

The strength of the bearing, compressive stress result from the bearing loading should also be check.

More importantly You might want to consider friction from the bearing also if your application is very load sensative. it might be more better to uses roller bearing over plain bearing.

Depends on your application and maintainence you can choose "Use and throw if spoil bearing" AKA maintainece free bearing (PTFE film coated) or grease lubricated bearing. PTFE bearing is more on light industrial usage, Grease lubricated bearing is used more on heavier industry.

For testing of plain bearing, so far I only encounter heat detection for bearing housing running under max. load and speed. The heat generated should be low. If the heat generation is too high, your bearing tolerence or selection might be wrong.