Radial foil bearing

By designing an opening and protruding structure in the bottom foil section, the problem of contact between the top foil section and the rotating parts is solved, thereby improving the stability of the bearing and the fluid pressure, making it suitable for high temperature and high pressure environments.

CN122396873APending Publication Date: 2026-07-14NTN CORP
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Patent Information

Application Number
CN202580007466.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2024-02-22
Filing Date
2025-01-08
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

Existing radial foil bearings may break when the top foil comes into contact with the rotating parts during high-speed rotation, affecting the bearing's stability and lifespan.

Method used

Multiple openings and protrusions are formed in the bottom foil section to reduce the rigidity of the bottom foil section, enabling it to follow the deformation of the top foil section, preventing the top foil section from contacting the rotating parts, and increasing fluid pressure through a wedge-shaped gap design.

Benefits of technology

Without reducing pressure, the top foil portion is prevented from contacting rotating parts, thereby improving bearing stability and fluid pressure, reducing vibration, and ensuring stable operation of the bearing under high temperature and high pressure conditions.

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Abstract

Each foil (12) of the radial foil bearing (10) has a top foil portion (12a) having a bearing surface (S) facing a rotating member (6), and a bottom foil portion (12c) provided to the top foil portion (12a) and overlapping a side opposite to the bearing surface (S) of the top foil portion (12a) of an adjacent foil. The bottom foil portion (12c) has a plurality of opening portions (13a).
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Citation Information

Patent Citations

  • Foil bearing

    JP2017096324A