A foil gas dynamic pressure bearing with outer surface slip

CN122107010APending Publication Date: 2026-05-29NANHUA UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANHUA UNIV
Filing Date
2026-04-27
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Traditional multi-blade foil bearings suffer from short service life due to the easy wear and tear of the solid lubricating coating caused by the overlapping sliding of the blades. Furthermore, high-frequency relative sliding can lead to blade jamming and tearing, resulting in bearing failure.

Method used

The foil overlaps are fixedly connected by welding to form an integrated elastic ring structure. The friction damping interface is transferred to the inner wall of the uncoated bearing sleeve to avoid relative sliding. The uncoated bare metal surface slides against the inner wall of the bearing sleeve to provide damping. An elastic foil is designed to be fixed on the bearing sleeve to prevent overall rotation.

Benefits of technology

It effectively prevents wear of the solid lubricating coating, extends the service life of the bearing, provides stable dry friction damping, reduces manufacturing and assembly difficulty, and improves the operational reliability and lifespan of the bearing.

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Abstract

The application discloses a foil gas dynamic pressure bearing with outer surface sliding, which comprises a bearing sleeve (2) and a foil ring assembly arranged in the bearing sleeve. The foil ring assembly is composed of a plurality of elastic foils (1) which are sequentially jointed in the circumferential direction. Two adjacent elastic foils (1) in the circumferential direction are fixedly connected by welding at the jointing position, so that the foil ring assembly forms an integrated elastic ring structure. The outer surface of the foil ring assembly is in contact with the inner wall of the bearing sleeve (2), and when the foil ring assembly is loaded and deformed, the outer surface slides relative to the inner wall of the bearing sleeve in the circumferential direction to provide dry friction damping. One elastic foil (1) in the foil ring assembly is fixed to the bearing sleeve (2) to form an anti-rotation structure. The application shifts the friction interface to the outside without coating, fundamentally avoids the wear of the lubricating coating caused by the internal jointing sliding, significantly prolongs the service life of the bearing, and has excellent damping and lift-off characteristics.
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