Explain the static rating of rolling contact bearings.
i) Explain the static rating of rolling contact bearings.
ii) Write any three technical reasons why ball and roller bearings need to be lubricated.
b) Design a self-aligning ball bearing to be used in a turbine to carry a combined radial load of 4466 N and thrust load of 1420 N. The basic dynamic load rating of the bearing is 31 kN at 547 rpm. Take k=3 for all types of ball bearings. Take the value of the shock load factor as 1.3. The axial and radial load factors are 1.8 and 1.2 respectively and the rotational factor is 1. Calculate:
i) Basic equivalent dynamic load in N
ii) Design equivalent dynamic load in N
iii) Expected life of bearings in hours
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