A straight (cylindrical) roller bearing subjected to 1387 N of radial load is to be selected for an application factor of 2,2. The life is to be 40 Kh at a speed of 720 rev/min and exhibit a reliability of 0,99. What basic load rating (C10) should be used in selecting the bearing if the bearing is selected from a catalog of bearing manufacturer where LR=5000h, nR=500 rpm. The weibull parameters are xo=0.02, (0-x.)=4.439, and bo=1.483.

A ball bearing, rotating at 1200 revolutions per minute, operates at a radial equivalent load of 29% of its dynamic load rating. What is the expected lifetime in hours at a reliability level of 90%? Please round your answer to the nearest hour. Type your answer...

A device contains two bearings is to operate at 300 rev/min, 8 hours per day, 5 days per week for 5 years with a reliability of 0.99. The design load is (2006) N and an application factor of 1.2 is appropriate. Find the catalog rating C10            a)For ball bearings         b) For roller bearings  The Weibull parameters are x0=0.02 ,(θ-x0)=4.439 and b=1.483 Use SI units. Take the relations as C10=afFD[xD/x0+(θ-x0)(1-RD)1/b]1/a and xD=LDηD60/LR  Where the subscripts D: desired R: rating f: factor

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