Question

A straight (cylindrical) roller bearing is subjected to a radial load of 20.2 kN. The life is to be 8000 h at a speed of 940 rev/min and exhibit a reliability of 0.9. What Basic Load Rating should be used in selecting the bearing from a catalog of manufacturer 2 in Table 11-6?

The catalog load rating _____ kN.

Answer #1

Basic load rating, C is the catalog load rating life of 10
^{6} revolutions.

For the reliability of 0.9, catalog load rating, C _{10}
,which causes 10% of a group of bearings to fail at the bearing
manufacturer's rating life.

Following formula is applicable.

C _{10} = F _{R} (L _{D}/ L
_{R}) ^{1/a} ,

Where a = 10/3 for cylindrical roller bearing

F _{R} = Radial load = 20.2 KN

L _{R} = 10 ^{6} rev

L _{D} = Life in revolutions = (8000 h * 60 min)* 940
rev/min = 451.2 million revolutions.

Put everything in formula,

C _{10} = 20.2 ( 451.2) ^{3/10}

C _{10} = 126.375 KN

An SKF Tapered roller bearing has an axial load Fa of 2220 N and
a radial load Fr of 2800 N applied with the inner ring stationary.
The basic static load rating C0 is 14800 N and the basic load
rating C10 is 35150 N. 1. Determine e. 2. Determine Yi. 3.
Determine Fe. 4. Estimate the bearing life at a speed of 720
rev/min.

Question # 3 Part A. 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 LD 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 of a reliability goal of 0.80? Is it a
safe decision?

Suppose a deep-groove ball bearing with a catalog load rating of
35.1 kN is to run at 1,785 rpm. The replacement interval for the
bearing must be at least 7,060 hours. It is satisfactory to design
for 90 percent reliability in this case.
Determine the maximum permissible radial load in kN.

Select a single row, deep-groove ball bearing to carry a radial
load of 300 lb and a thrust load of 200 lb. The outer race is
rotating at a speed of 350 rpm, and a design life of 40000 hr is
desired. A bearing with a basic dynamic load rating of 7500 lb and
a basic static load rating of 5850 lb is proposed. Will it work?
solve it in details, thank you.

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