Question

A ball bearing on a shaft has a variable loading as shown in the table below. What is the minimum C10 rating required for the bearing to last 10,000 hours for Ls Life? One Cycle Phase 2 6 1500 2000 1.8 Phase 1 4 1000 Phase 3 Minutes in Phase Speed (RPM) Bearing Load (N)3000 Application Factor 800 5000 1.5 1.2

Answer 1

Here ,

Soln -From table ,we have ニ3600 N 2 3 4000 + 000 + 6 o o ニ44-44.2N 一) 11-17 We Knou tt 45 0 , 5405 二 0,000 5405 드 18500.36 x60 x 3300 lo -3, 66x103 MR Pa 4444.2 68508.55 N Ans.

Pe = Equivalent load , Total revolution per minute in one cycle = N1 + N2 + N3 = 1000 + 1500 + 800 = 3300 rev/min .