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 exterior lubrication for use in submersible pumps handling cryogenic gases corresponding to hydrogen and LNG.
NSK has developed special shaft bearings with a cage produced 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 increasing adoption in submersible pumps as a growing variety of projects promote the utilization of hydrogen as an vitality supply. These projects often use particular submersible pumps that may reliably pump gaseous and liquid media in continuous or intermittent operation at low temperatures right down to around -200°C.
In such pumps, the double bearing of the pump shaft is a crucial design element. Corrosion resistance is important, and no lubricant can be used other than the media washing around the bearing. However, เกจวัดแก๊สหุงต้ม places robust calls for on the fabric pairing.
So NSK has developed a collection of deep groove ball bearings particularly for these distinctive operating circumstances, and a variety of other key design options present differentiation from typical pump bearings. For example, the inner and outer rings are manufactured from a stainless steel tailored to the special necessities of rolling bearings.
A steady cage that occupies the whole internal volume of the bearing provides guidance for the rolling parts (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 extraordinarily wear-resistant and presents 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 can be found in varied sizes (shaft diameter 30–100 mm) and are designed to be used in both bigger hydrogen pumping services and decentralised functions, such as hydrogen filling stations.

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