Hybrid deep groove ball bearings
- are non-separable
- are suitable for high speeds
- accommodate radial loads and axial loads in both directions because their uninterrupted raceway grooves have a close osculation with the balls
- are available with a bore diameter ranging from 5 to 180 mm
with a bore diameter d ≤ 45 mm, are most suitable for electric motors in the power range 0,15 to 15 kW as well as for power tools and high-speed drives
SKF hybrid deep groove ball bearings in this size range are the most cost-effective solution against electrical erosion.
Basic design bearings
- are available with a bore diameter d ≥ 10 mm (fig. 1)
- use the same seals as described under Capped bearings
- are lubricated for the life of the bearing and should not be washed or relubricated
- are virtually maintenance-free
Seals made of FKM (fluoro rubber) exposed to an open flame or temperatures above 300 °C (570 °F) are a health and environmental hazard! They remain dangerous even after they have cooled.
Read and follow the safety precautions under this WARNING.
The estimated grease life is typically at least twice as long as for same-sized bearings with steel balls (→ Grease life for capped bearings).
XL hybrid bearings
- are identified by the designation suffix VA970
- are designed to meet the application requirements for electric generators in larger wind turbines.
- are available for the most commonly used generator sizes (→ product table)
- a stamped steel cage, riveted, ball centred (no designation suffix)
- a glass fibre reinforced PA66 cage, snap-type, ball centred (designation suffix TN9)
- a glass fibre reinforced PEEK cage, snap-type, ball centred (designation suffix TNH)
- a machined brass cage, riveted, ball centred (designation suffix M)
For additional information, refer to Cages.
When used at high temperatures, some lubricants can have a detrimental effect on polyamide cages. For additional information about the suitability of cages, refer to Cages.
Hybrid bearings with special steel rings and coatings
- bearing rings stabilized for temperatures ≤ 300 °C (570 °F)
- bearing rings made of through-hardened stainless steel for enhanced corrosion and wear-resistance and with good high-temperature properties
- bearing rings made of through-hardened stainless steel for cryogenic temperatures
- bearing rings made of high-temperature tool steel
- ring coating with zinc chromate or thin dense chromium for corrosion protection
- ring coating based on molybdenum for low friction, especially in vacuum or gas applications