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# Moment load capacity of a needle or cylindrical roller bearing?

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## Moment load capacity of a needle or cylindrical roller bearing?

(OP)
Following up from this conversation: thread821-159659: Effect of applied moment on B10 life?

Can a cylindrical roller element bearing support a moment load?
I would assume the calculation would be the assumption of a point contact at the ends of the roller from a radial force couple. The equivalent radial load being that due to the force couple i.e. a rough estimate of a 10Nm moment on a 10mm wide needle bearing would be 2000N in opposing direction applied 5mm from the radial center plane of the bearing in addition to whatever the applied radial load that caused the moment.

now I realize the training is always two bearings. but, in the case of limited axial space, would this be a reasonable assumption?

The remaining questions would be: does the assembled clearance cause the radial force vector to skew some to an axial load, then requiring the axial load to be supported by the bearing thrust ring?

### RE: Moment load capacity of a needle or cylindrical roller bearing?

Applying a lateral moment load to a needle or roller bearing is such a fluorescently bad idea that I doubt any public life data exists.

OTOH, you could develop your own; the experiments should run quickly.
I'd expect a life measured in minutes.

Mike Halloran
Pembroke Pines, FL, USA

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