Rolling bearings support and guide the rotation or oscillation of machine parts (e.g. shafts, axles or wheels) with minimal friction and
transmit loads between machine parts.
Rolling bearings have high precision and low friction, thus enabling high speeds with reduced noise, heat, energy consumption and wear.
They are cost-effective and are typically interchangeable machine parts that meet national or international dimensional standards.
Ball and roller bearings
The two basic types of rolling bearings are distinguished by the two basic types of rolling elements:
• Ball → ball bearings
• Roller → roller bearings
The difference between balls and rollers is the way they contact the raceways.
The balls make point contact with the inner and outer raceways of the bearing .
As the load acting on the bearing increases, the contact point becomes an elliptical area. A small contact area results in low rolling friction,
which allows ball bearings to operate at high speeds, but their load-carrying capacity is limited. The rollers make line contact with the inner
and outer raceways of the bearing . As the load acting on the bearing increases, the contact line becomes more rectangular. Due to the larger
contact area and the resulting higher friction, roller bearings can carry heavier loads than ball bearings of the same size, but at lower speeds.
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