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NSK develops self-lubricating rolling bearings

NSK Europe, the European arm of Japanese bearing manufacturer NSK, has developed deep groove ball bearings that don’t require external lubrication for use in submersible pumps dealing with cryogenic gases similar to hydrogen and LNG.
NSK has developed particular shaft bearings with a cage created from self-lubricating fluoroplastic for submersible pumps that handle 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 growing variety of initiatives promote the use of hydrogen as an energy source. These tasks often use particular submersible pumps that may reliably pump gaseous and liquid media in continuous or intermittent operation at low temperatures right down to around -200°C.
In เกจ์ออกซิเจนsumo , the double bearing of the pump shaft is a critical design factor. Corrosion resistance is essential, and no lubricant can be utilized other than the media washing across the bearing. However, this places tough calls for on the material pairing.
So NSK has developed a sequence of deep groove ball bearings specifically for these exceptional working conditions, and several key design features present differentiation from standard pump bearings. For instance, the internal and outer rings are made from a chrome steel adapted to the special necessities of rolling bearings.
A secure cage that occupies the entire inner volume of the bearing supplies guidance for the rolling elements (also made from stainless steel), while the cage materials, a self-lubricating fluoroplastic, ensures low friction operating of the bearing without external lubrication. In addition, the high-performance fluoroplastic is extraordinarily wear-resistant and presents good low-temperature properties at speeds as much as 3600 rpm. The cage has a two-piece design, with the 2 halves joined by chrome steel rivets.
The NSK bearings are available in varied sizes (shaft diameter 30–100 mm) and are designed for use in each bigger hydrogen pumping services and decentralised functions, similar to hydrogen filling stations.

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