The radial load on a 180° hydro-dynamically lubricated journal bearing is 12 KN, journal speed is 960 rpm. Assuming a suitable fit, design the bearing for average clearance. Considering heat generated is dissipated from the bearing surface area, which is 25 LD. The bearing, which is placed in an oil bath, is cooled by moving air. The pressure is limited to $1.5 N/mm^2 $. Find oil flow rate, coefficient of friction, power loss, and temperature rise.

Given Data

Type of Bearing - 180° Half Journal Hydro-dynamically Lubricated Bearing.

Load (W) - 12 KN

Speed (N) - 960 rpm = 16rps

Allowable Bearing Pressure $[P] -1.5 N/mm^2$

Surface area for heat Dissipation $(A)=25 LD$

Solution

A 180 º hydro dynamically lubricated journal bearing supports a radial load of 10 KN when operating at 750 rpm for an air blower. The radius to radial clearance is 1000 and SAE 20 oil is used for lubrication. Design the bearing and check its operating parameters like oil flow rate, Temperature, Bearing surface temperature, Coefficient of friction and frictional power loss