Why Single Direction Thrust Ball Bearings Can Only Be Used in One Direction

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SUMMARY

Single direction thrust ball bearings are designed to accommodate axial loads in one direction only due to their specific construction, which includes a single row of balls and a cage that restricts movement. This design limits the bearing's ability to handle thrust in the opposite direction, making them unsuitable for applications requiring bidirectional thrust support. In contrast, double direction thrust ball bearings can manage loads in both directions, providing greater versatility in mechanical systems.

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gas_guzzler
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This isn't a homework question, but something I'm interested to know that my engineering corespondance doesn't mention.

I'm aware there is both single direction and double direction thrust ball bearings but can anyone tell me why can a single direction thrust ball bearing only be used in one direction?
 
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Some bearings can take thrust in one direction only, such as http://commons.wikimedia.org/wiki/File:Tapered-roller-bearing_din720_120-ex.png" . Click on the links above to see pictures.
 
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