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CH 11

This document contains problems related to selecting ball bearings for different applications. It includes details on bearing specifications like speed, load, required life, and reliability goals. It asks the reader to use these details to calculate values needed to select an appropriate bearing from provided tables, and to estimate the reliability of the bearing in the given application. It also contains a problem asking the reader to calculate the overall reliability of a pair of bearings based on the individual reliabilities, and what this implies for setting reliability goals for bearings used in pairs.

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Faysal Qadeer Khan
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238 views17 pages

CH 11

This document contains problems related to selecting ball bearings for different applications. It includes details on bearing specifications like speed, load, required life, and reliability goals. It asks the reader to use these details to calculate values needed to select an appropriate bearing from provided tables, and to estimate the reliability of the bearing in the given application. It also contains a problem asking the reader to calculate the overall reliability of a pair of bearings based on the individual reliabilities, and what this implies for setting reliability goals for bearings used in pairs.

Uploaded by

Faysal Qadeer Khan
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Chapter 11

Graphics, problem statements, tables, graphs etc. to supplement board


activity
(The slides, being aids for discussion, are by no means replacement of
the text book)
Problem 11-1 A certain application requires a ball bearing with the inner
ring rotating, with a design life of 25 kh at a speed of 350 rev/min. The radial
load is 2.5 kN and an application factor of 1.2 is appropriate. The reliability
goal is 0.90. 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.
Problem 11-1 A certain application requires a ball bearing with the inner
ring rotating, with a design life of 25 kh at a speed of 350 rev/min. The radial
load is 2.5 kN and an application factor of 1.2 is appropriate. The reliability
goal is 0.90. 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.
Problem 11-3 An angular-contact, inner ring rotating, 03-series cylindrical
roller bearing is required for an application in which the life requirement is 40
kh at 520 rev/min. The design radial load is 7342 N. The application factor is
1.4. The reliability goal is 0.90. Find the multiple of rating life xD required and
the catalog rating C10 with which to enter Table 11–3. Choose a bearing and
estimate the existing reliability in service.
Problem 11-3 An angular-contact, inner ring rotating, 03-series cylindrical
roller bearing is required for an application in which the life requirement is 40
kh at 520 rev/min. The design radial load is 7342 N. The application factor is
1.4. The reliability goal is 0.90. Find the multiple of rating life xD required and
the catalog rating C10 with which to enter Table 11–3. Choose a bearing and
estimate the existing reliability in service.
Problem 11-4 A pair od bearings support a shaft. If the individual
reliabilities of the two bearings are 0.945 and 0.917, what is the reliability of
the two bearings (probability that either or both will not fail)? What does this
mean in setting reliability goals for each of the bearings of the pair on the
shaft?

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