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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 do not require external lubrication to be used in submersible pumps dealing with cryogenic gases such as hydrogen and LNG.
NSK has developed special 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 manufactured from self-lubricating fluoroplastic are seeing increasing adoption in submersible pumps as a rising number of tasks promote using hydrogen as an vitality source. These projects usually use special submersible pumps that can 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 element. Corrosion resistance is essential, and no lubricant can be used apart from the media washing around the bearing. However, this places powerful calls for on the material pairing.
So NSK has developed a sequence of deep groove ball bearings particularly for these exceptional operating conditions, and several other key design options present differentiation from typical pump bearings. For instance, the inside and outer rings are made from a chrome steel adapted to the particular necessities of rolling bearings.
A stable cage that occupies the entire internal volume of the bearing offers steerage for the rolling elements (also manufactured from stainless steel), whereas the cage materials, a self-lubricating fluoroplastic, ensures low friction operating of the bearing without external lubrication. In addition, the high-performance fluoroplastic is extremely wear-resistant and provides good low-temperature properties at speeds up to 3600 rpm. เพรสเชอร์เกจคือ has a two-piece design, with the two halves joined by stainless steel rivets.
The NSK bearings are available in various sizes (shaft diameter 30–100 mm) and are designed to be used in both bigger hydrogen pumping facilities and decentralised applications, corresponding to hydrogen filling stations.
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