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 to be used in submersible pumps handling 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 made from self-lubricating fluoroplastic are seeing growing adoption in submersible pumps as a growing number of initiatives promote the use of hydrogen as an vitality source. These projects usually use particular submersible pumps that can reliably pump gaseous and liquid media in continuous or intermittent operation at low temperatures all the means down to round -200°C.
In such pumps, the double bearing of the pump shaft is a critical design component. Corrosion resistance is important, and no lubricant can be used aside from the media washing around the bearing. However, this places tough demands on the material pairing.
So NSK has developed a sequence of deep groove ball bearings specifically for these exceptional working circumstances, and several key design features present differentiation from conventional pump bearings. For example, the internal and outer rings are made from a chrome steel tailored to the special necessities of rolling bearings.
เครื่องมือวัดความดัน that occupies the whole internal quantity of the bearing supplies steering for the rolling components (also manufactured from stainless steel), while the cage materials, a self-lubricating fluoroplastic, ensures low friction working of the bearing without external lubrication. In addition, the high-performance fluoroplastic is extraordinarily wear-resistant and offers good low-temperature properties at speeds up to 3600 rpm. The cage 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 functions, such as hydrogen filling stations.

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