Rolling bearings

Generally, bearings secure a mutual position of fixed and turning parts, and transfer load of a shaft to other machine parts. Friction is formed between the moving surfaces of the shaft and bearing. There are two types of bearings according to the loading force's direction: radial and axial.

Advantages: Relatively small dimensions and low weight, suitable for high revolutions, little maintenance, relatively small losses due to friction and almost identical in standstill and in motion (fast bringing the machine into operation)

Disadvantages: unsuitable for very high peripheral speed (centrifugal forces – fatigue of the rings), always noisier than plain bearings, no vibration dampening

Structural design

Rolling bearing selection
When selecting the bearing type, it is necessary to consider especially the following aspects:

• Load size and type
• Placing structure and bearing lubrication method
• Bearing operating parameters (revolutions, thermal conditions, etc.)
• Accuracy requirements
• Assembly and disassembly requirements

Basic types

• Ball bearings
• Oblique contact ball bearings
• Swing ball bearings
• Roller bearings
• Needle bearings
• Tapered bearings
• Spherical roller bearings
• Toroidal bearings
• Axial ball bearings
• Axial roller bearings
• Axial needle bearings
• Axial spherical roller bearings