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 exterior lubrication for use in submersible pumps dealing with cryogenic gases such as hydrogen and LNG.
NSK has developed special 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 made from self-lubricating fluoroplastic are seeing growing adoption in submersible pumps as a growing number of initiatives promote the usage of hydrogen as an power source. เกจวัดแรงดันถังออกซิเจน use special submersible pumps that may reliably pump gaseous and liquid media in continuous or intermittent operation at low temperatures right down to round -200°C.
In such pumps, the double bearing of the pump shaft is a critical design factor. Corrosion resistance is crucial, and no lubricant can be utilized apart from the media washing around the bearing. However, this places robust demands on the material pairing.
So NSK has developed a sequence of deep groove ball bearings specifically for these distinctive working situations, and several key design features present differentiation from typical pump bearings. For instance, the internal and outer rings are made of a stainless steel adapted to the special requirements of rolling bearings.
A steady cage that occupies the entire inside volume of the bearing provides steerage for the rolling components (also made from stainless steel), whereas the cage materials, a self-lubricating fluoroplastic, ensures low friction working of the bearing without external lubrication. In addition, the high-performance fluoroplastic is extremely wear-resistant and offers good low-temperature properties at speeds as much 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 varied sizes (shaft diameter 30–100 mm) and are designed to be used in each bigger hydrogen pumping facilities and decentralised functions, similar to hydrogen filling stations.

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