Designing Hydrodynamic Bearing

Important Factors for Designing Hydrodynamic Bearing:

Most Babbitt bearings are operated as hydrodynamically lubricated bearings and the design considerations for hydrodynamic bearings are significant as well. To ensure minimized friction and bearing wear, the bearing material for hydrodynamic bearings should have moderate shaft deflection and adequate strength at operating temperature conditions. At the hydrodynamic bearing inlet, there must be continuous and adequate supply of clean and cool oil.

Principles of Journal Bearing Design

The role of a bearing is to provide relative positioning and rotational freedom while transmitting the load of the shaft to the bearing housing. The factor, which controls the length of the bearing to journal diameter, is known as the L/D ratio. When this ratio is greater than unity, it results in a long bearing, while a ratio less than unity would result in short bearings.

The deflection produced by the journal within the bearing can adversely affect its load carrying ability. This deflection can be greatly reduced by increasing the diameter and decreasing the length of the journal.