A wave-foil type gas dynamic pressure radial bearing and rotor of a rotor outer surface dovetail groove micro-texture

CN122236734APending Publication Date: 2026-06-19HUAZHONG UNIV OF SCI & TECH

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner: HUAZHONG UNIV OF SCI & TECH
Filing Date: 2026-03-26
Publication Date: 2026-06-19

AI Technical Summary

Technical Problem

Existing corrugated foil type gas dynamic radial bearings have insufficient load-bearing capacity under medium and heavy load conditions. The micro-texture design on the outer surface of the rotor is not suitable, and the machining accuracy is insufficient, making it difficult to meet the dimensional requirements of micro-scale gas film gaps.

Method used

Multiple dovetail groove microtextured bands are arranged circumferentially on the outer surface of the rotor. Each dovetail groove unit is formed by two outer oblique sides and two tail-retracting fold lines. The groove gradually expands and the tail retracts, forming a geometric structure with local gas storage and enhanced dynamic pressure. It is prepared and polished by picosecond laser micromachining technology, combined with alloy materials and wear-resistant protective coating.

Benefits of technology

It enhances the local air storage and dynamic pressure effect of the air film, improves the load-bearing capacity and anti-disturbance ability, ensures the stability of the bearing under high-speed operation and the uniformity of the air film pressure distribution, and extends the service life of the bearing.

✦ Generated by Eureka AI based on patent content.

Smart Images

Figure CN122236734A_ABST

Patent Text Reader

Abstract

This invention relates to the field of gas dynamic radial bearing technology, and discloses a corrugated foil type gas dynamic radial bearing and rotor with a dovetail groove microtexture on the outer surface of the rotor. Seven symmetrical dovetail groove microtexture bands are arranged circumferentially on the outer surface of the rotor, each band consisting of an array of multiple dovetail groove units. Each dovetail groove unit has an axially pointed tip and an inwardly tapering tail profile on the rotor's unfolded plane, forming a local flow channel for introduction, compression, and pressure holding along the rotor's rotation direction. Adjacent axial rows are staggered circumferentially to improve the uniformity of the gas film pressure field. The dovetail groove microtexture is fabricated using picosecond laser micromachining technology. This invention improves the bearing's load-bearing capacity, operational stability, and adaptability to high-speed conditions by leveraging the geometrically induced local gas storage and dynamic pressure enhancement effect of the dovetail grooves, combined with the synergistic effect of the aeroelastic deformation of the corrugated foil and flat foil. It is suitable for high-speed rotating machinery support systems.

Need to check novelty before this filing date? Find Prior Art