Discussion
A shaft carries a helical spur gear. Which one of the following bearings can NOT be used to support it?
Answer: C
The bearing that can NOT be used is the straight roller bearing.
A helical gear produces an axial (thrust) force as well as radial load, because its teeth are inclined to the axis. A straight (cylindrical) roller bearing carries radial load only and has essentially no thrust capacity.
Angular contact bearings and tapered roller bearings are designed for combined radial and axial loads, and a double-row ball bearing also takes moderate thrust in both directions.
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