NSK develops self-lubricating rolling bearings

NSK Europe, the European arm of Japanese bearing producer NSK, has developed deep groove ball bearings that don’t require exterior lubrication to be used in submersible pumps handling cryogenic gases corresponding to hydrogen and LNG.
NSK has developed particular shaft bearings with a cage made from self-lubricating fluoroplastic for submersible pumps that deal with cryogenic gases and liquids.
The stainless-steel bearings with a cage made of self-lubricating fluoroplastic are seeing rising adoption in submersible pumps as a rising number of initiatives promote the usage of hydrogen as an energy supply. These initiatives usually use particular submersible pumps that may reliably pump gaseous and liquid media in steady or intermittent operation at low temperatures right down to around -200°C.
In such pumps, the double bearing of the pump shaft is a critical design component. Corrosion resistance is essential, and no lubricant can be used apart from the media washing across the bearing. However, this places robust demands on the material pairing.
So NSK has developed a series of deep groove ball bearings specifically for these exceptional operating conditions, and several other key design options provide differentiation from conventional pump bearings. For instance, the inside and outer rings are manufactured from a stainless steel adapted to the particular requirements of rolling bearings.
A steady cage that occupies the whole internal volume of the bearing provides guidance for the rolling elements (also made of stainless steel), while the cage material, a self-lubricating fluoroplastic, ensures low friction running of the bearing with out exterior lubrication. In addition, the high-performance fluoroplastic is extremely wear-resistant and offers good low-temperature properties at speeds as a lot as 3600 rpm. The cage has a two-piece design, with the 2 halves joined by chrome steel rivets.
pressure gauge 2.5 นิ้ว are available in varied sizes (shaft diameter 30–100 mm) and are designed to be used in each bigger hydrogen pumping services and decentralised functions, such as hydrogen filling stations.

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