Linear Technology
Rolling Element
Rolling elements are the rolling components between two raceways in guides and bearings. They transmit loads and minimize friction. Balls produce point contact for high speeds; rollers produce line contact for greater load capacity.
Definition and Operating Principle
Rolling elements replace sliding friction with rolling friction, significantly reducing the coefficient of friction. Depending on the geometry, different contact conditions arise: a ball contacts the raceway at a single point (Hertzian contact), while a cylindrical roller makes contact along a line. The contact geometry largely determines the permissible surface pressure, the load rating, and the speed capability of the entire guide or bearing system.
Ball vs. Roller Comparison
| Feature | Ball | Cylindrical Roller |
|---|---|---|
| Contact type | Point contact | Line contact |
| Load capacity | Medium | High |
| Stiffness | Medium | High |
| Max. speed | High | Medium |
| Typical application | Ball guides, ball bearings | Roller guides, cylindrical roller bearings |
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