Problem 5.2: An angular-contact, inner ring rotating, 02-series ball bearing is required for an application in which the life requirement is 40 kh at 520 rev/min. The design radial load is 725 lbf. The application factor is 1.4. The reliability goal is 0.90. Find the rating life X required and the catalog rating C10 from Table 11–2. Choose a bearing and estimate the existing reliability in service.

An 02-series ball bearing is to be selected to carry a radial load of 8 kN and a thrust load of 4 kN. The desired life Lp is to be 5000 h with an inner-ring rotation rate of 900 rev/min. What is the basic load rating that should be used in selecting a bearing for a reliability goal of 0.90? Hints: Rating life is 1(10°) revolutions, Weibull parameters of rating lives are x, = 0.02,0 = 4.459, b = 1.483 respectively.

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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 2024 N and an application factor of 1.2 is appropriate. Find the catalog rating C10   For ball bearings For roller bearings   The Weibull parameters are and Use SI units. Take the relations as     and     Where the subscripts D: desired R: rating f: factor

The problem needs to be solved using probalistic design using normal distrubtion table Z

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b) Design a single row deep groove ball bearing with basic dynamic load rating of 33 KN to be used in a turbine to carry a radial load of 1584 N. The expected life of the bearing is 5591 hours at 529 rpm. Take k=3 for all types of ball bearings. Take the value of the shock load factor as 1.8. The radial and axial load factors are 1.3 and 1.6 respectively and the rotational factor is 1. Calculate: i) Expected life of bearings in millions of revolutions ii) Design equivalent dynamic load in N  iii) Basic equivalent dynamic load in N  iv) Axial load acting on the bearing in N

A certain application requires a ball bearing with the inner ring rotating, with a design life of 26 kh at a speed of 455 rev/min. The radial load is 2.5 kN and an application factor of 1.2 is appropriate. The reliability goal is 0.92. Find the multiple of rating life required, xD , and the catalog rating C10 with which to enter a bearing table. Choose a 02-series deep-groove ball bearing from Table 11–2 and estimate the reliability in use.

Design a single row deep groove ball bearing with basic dynamic load rating of 33 KN to be used in a turbine to carry a radial load of 1612 N. The expected life of the bearing is 5400 hours at 501 rpm. Take k=3 for all types of ball bearings. Take the value of the shock load factor as 1.8. The radial and axial load factors are 1.3 and 1.6 respectively and the rotational factor is 1. Calculate:   i) Expected life of bearings in millions of revolutions                         ii) Design equivalent dynamic load in N                                             iii) Basic equivalent dynamic load in N                                               iv) Axial load acting on the bearing in N

A certain application requires a ball bearing with the inner ring rotating, with a design life of LD = 15 kh at a speed of nD = 480 rev/min. The radial load is Fr = 1.4 kN, the axial load Fa = 0.4 kN, and an application factor of af = 1.2 is appropriate. The reliability goal, R = 0.99. a) Determine the multiple of rating life required, xD, and the catalog rating C10FR, where FR is the calculated bearing load in [kN] with which we enter a bearing table. Specify a 02-series angular contact ball bearing from Table 11–2,    b) Estimate the reliability (R) and multiple of rating-life (XD) in use.