Science · 6 pages · 12 min
How ball bearings change sliding into rolling
Balls let the races roll on each other so the contact does not have to scrape.
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From the opening
Ball bearings change sliding into rolling by putting hard spheres between two races. The inner and outer rings move by the balls rotating, so the main motion at the contact is rolling rather than scraping. The opening covers rolling contact instead of scraping, why some micro-slip remains, and how a sleeve bearing differs.
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Inside
- Rolling contact instead of scraping
- Why some micro-slip remains
- How a sleeve bearing differs
- What a dent does on every pass
- Where the idea stops applying
- A distinction worth keeping
Sources
- Rolling contact versus sliding contact
- Hertzian contact and micro-slip in ball bearings