Answered: A gear-reduction unit uses the…

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter20: Troubleshooting Electric Motors

Section: Chapter Questions

Problem 15RQ: Electric motor roller and ball bearing failure often can be determined by the _____.

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Question

A gear-reduction unit uses the countershaft depicted in the figure. Find the two bearing reactions.The bearings are to be angular-contact ball bearings, having a desired life of 60 kh when used at 330 rev/min. Use 1.2 for the application factor and a reliability goal for the bearing pair of 0.92

16
14
25°
12
240 lbf
20°
Gear 3, 24 dia.
B
Gear 4, 12 dia.

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