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 dealing with cryogenic gases such as hydrogen and LNG.
NSK has developed particular shaft bearings with a cage made 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 increasing adoption in submersible pumps as a rising number of initiatives promote the use of hydrogen as an vitality supply. These tasks often use special submersible pumps that may reliably pump gaseous and liquid media in steady or intermittent operation at low temperatures down to around -200°C.
In such pumps, the double bearing of the pump shaft is a important design factor. Corrosion resistance is crucial, and no lubricant can be used apart from the media washing across the bearing. However, this locations robust calls for on the material pairing.
So NSK has developed a series of deep groove ball bearings particularly for these exceptional working situations, and various other key design options provide differentiation from conventional pump bearings. For instance, the inside and outer rings are made from a stainless-steel tailored to the particular requirements of rolling bearings.
Track record that occupies the whole inner quantity of the bearing offers steerage for the rolling components (also manufactured from stainless steel), whereas the cage material, a self-lubricating fluoroplastic, ensures low friction operating of the bearing with out external lubrication. In addition, the high-performance fluoroplastic is extraordinarily wear-resistant and provides good low-temperature properties at speeds up to 3600 rpm. Simple has a two-piece design, with the 2 halves joined by stainless-steel rivets.
The NSK bearings can be found in numerous sizes (shaft diameter 30–100 mm) and are designed for use in both bigger hydrogen pumping facilities and decentralised purposes, corresponding to hydrogen filling stations.

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