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NSK develops self-lubricating rolling bearings

NSK Europe, the European arm of Japanese bearing producer NSK, has developed deep groove ball bearings that do not require external lubrication for use in submersible pumps handling cryogenic gases similar to hydrogen and LNG.
NSK has developed particular shaft bearings with a cage produced from self-lubricating fluoroplastic for submersible pumps that deal with cryogenic gases and liquids.
The stainless-steel bearings with a cage manufactured from self-lubricating fluoroplastic are seeing rising adoption in submersible pumps as a rising variety of projects promote the use of hydrogen as an power source. These projects usually use particular submersible pumps that may reliably pump gaseous and liquid media in steady or intermittent operation at low temperatures all the way down to round -200°C.
In such pumps, the double bearing of the pump shaft is a critical design factor. Corrosion resistance is important, and no lubricant can be used aside from the media washing around the bearing. However, this locations robust calls for on the fabric pairing.
So NSK has developed a collection of deep groove ball bearings particularly for these exceptional operating conditions, and a variety of other key design features provide differentiation from conventional pump bearings. For instance, the inside and outer rings are manufactured from a chrome steel adapted to the particular necessities of rolling bearings.
A secure cage that occupies the whole inside volume of the bearing supplies guidance for the rolling elements (also made from stainless steel), while the cage material, a self-lubricating fluoroplastic, ensures low friction running of the bearing with out external lubrication. In diaphragm seal , the high-performance fluoroplastic is extremely wear-resistant and provides good low-temperature properties at speeds as a lot as 3600 rpm. The cage has a two-piece design, with the two halves joined by stainless steel rivets.
The NSK bearings are available in numerous sizes (shaft diameter 30–100 mm) and are designed for use in both bigger hydrogen pumping facilities and decentralised applications, such as hydrogen filling stations.

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