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Question A gear-reduction unit uses the countershaft depicted in the figure. Find the two bearing reactions.

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Description

Question

A gear-reduction unit uses the counter shaft depicted in the figure. Find the two bearing reactions. The bearings are to be angular-contact ball bearings, having a desired life of 40 kh when used at 200 rev/min.  Use 1.2 for the application factor and a reliability goal for the bearing pair of 0.95. Select the bearings from Table 11–2.

Given data:
  • D = 40 kh   
  • N = 200 rpm
  • Application factor, af = 1.2
  • R = 0.95
Required:
  • Two bearing reactions R0, Rc =?
  • Select proper bearing.

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