High temperature bearings and bearing units

SKF high temperature bearing designs and variants incorporate various graphite-based lubrication solutions, including:

lubricating paste composed of a polyalkylene glycol/graphite mixture

graphite cages (segmented or coronet)

For an overview of lubricant types, and other characteristics, for high temperature deep groove ball bearings and insert bearings and ball bearing units, refer to table 1 and table 2.

During operation, the graphite maintains a very thin film on the bearing’s raceways and rolling elements to reduce wear significantly. Graphite ages at a much higher temperature than oil and grease, and therefore does not lose its lubricating properties at the high temperatures at which it is recommended for use, so the need for relubrication is eliminated.

With many variants, all surfaces of the bearing and, where applicable, shields and flingers are manganese phosphate coated to enhance adhesion of the lubricant to the metal and provide some protection against corrosion.

SKF high temperature bearings are designed to provide solutions to common issues in high temperature applications. In addition to operations involving high temperatures and low rotational speeds, it is important to consider environmental conditions in the process area.

Since high temperature bearings are supplied without preservative oils and must be used without grease or oil lubrication, the anti-corrosion property of the bearings is limited. Therefore, the bearings should be used in a dry environment or with a proper sealing solution to keep the bearings dry.

metals industry (cooling beds, roller tables, furnaces)

food and beverage industry (continuous baking ovens, wafer baking ovens)

automotive industry (paint lines, heat treatment ovens)

glass industry (glass tableware or flat glass manufacturing processes)

construction industry (tiles, mineral wool manufacturing)

The SKF standard assortment of high temperature bearings and bearing units corresponding to ISO standards includes:

Deep groove ball bearings (fig. 1)

Insert bearings (Y-bearings) (fig. 2)

Ball bearing units (fig. 3)

The assortment includes variants that contain food-grade lubricants registered by NSF as category H1 (lubricant acceptable with incidental food contact, for use in and around food processing areas). The NSF registration confirms the lubricant fulfils the requirements listed in the US Food and Drug Administration’s guidelines under 21 CFR section 178.3570.

Customized bearings

In addition to high temperature bearings corresponding to ISO standards, SKF offers an assortment of customized high temperature bearings (fig. 4, fig. 5).

These bearings are customized for use in applications such as:

automatic wafer baking ovens in the food and beverage industry

industrial furnaces

chains

For additional information, contact SKF.

fig. 1

fig. 2

fig. 3

fig. 4

fig. 5