Insert bearings and ball bearing units for high temperature applications

Ball bearing unit for high temperature applications

Except for the cage and seals, SKF insert bearings (Y-bearings) for high temperature applications correspond in design to standard insert bearings with grub screws in the YAR 2-2F series. The bearings have a shield and a flinger on both sides to prevent the ingress of solid contaminants into the bearing.

The entire surface of the bearing and the shields are manganese phosphated to enhance adhesion of the lubricant to the metal and improve the running-in properties of the bearing. The flingers are treated by pickling. 

The radial internal clearance is a multiple of C5 to prevent the bearings from seizing, even when they cool rapidly.

Bearing benefits and features

The benefits and features of high temperature insert bearings and ball bearing units (fig. 1) include:
  1. No need for relubrication
    All variants are lubricated for the life of the bearing with graphite-based high temperature lubricants.
  2. Simple replacement
    The boundary dimensions are the same as those of standard bearings and units.
  3. Operating temperature up to 350 °C (660 °F)
    The internal radial clearance and the lubricant are optimized for operation at high temperatures.
  4. Quick and easy mounting and dismounting
    The grub (set) screws in the inner ring enable quick and easy mounting/dismounting.
  5. Protection against solid contamination
    Shields and flingers (designation suffix 2F) protect the bearing.
  6. Improved running in
    The entire bearing surface is manganese phosphate coated.
  7. No colour flaking
    The housing is coated with a high temperature resistant coating.

Designs and variants

The SKF assortment of insert bearings and ball bearing units for high temperature applications (fig. 2) provides solutions for various combinations of operating temperature and speed.

Table 1 lists the lubrication type, maximum operating temperature, limiting speed, maintenance requirements and all other primary characteristics of the variants within the assortment.

Sealing solutions

SKF high temperature insert bearings are capped on both sides with a shield and a flinger that create a narrow gap-type labyrinth seal (designation suffix 2F, fig. 2).

For high temperature bearings, metallic shields are the primary recommendation where a capping device with low complexity is required. The shields:

  • prevent the ingress of solid contaminants into the bearing
  • are non-contacting
  • generate no friction
  • do not wear
  • are particularly well suited for high temperatures because of their material and design

Zinc chromate ball bearing unit designs

SKF ball bearing units for high temperature applications are available in three different housing designs:
  • Zinc chromate plummer block units (fig. 3)
  • Zinc chromate square flanged units (fig. 4)
  • Zinc chromate oval flanged units (fig. 5)
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