A gas bearing assembly and air floating motorized spindle having the same

By optimizing the structure and assembly method of the gas bearing assembly, the problems of insufficient support stiffness and stability of the air-bearing electric spindle at high speeds have been solved, realizing a high-precision and high-stability air-bearing electric spindle design suitable for ultra-precision machining.

CN122216244BActive Publication Date: 2026-09-08JIHUA LAB
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Patent Information

Application Number
CN202610701533.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-05-21
Publication Date
2026-09-08
Estimated Expiration
2046-05-21

AI Technical Summary

Technical Problem

Existing air-bearing electric spindles suffer from problems such as insufficient support stiffness, coaxiality deviation, gas eddies and vibration, and rotor skew at high speeds, which affect machining accuracy and stability.

Method used

The design incorporates features such as annular air inlet grooves, a composite pressure equalization structure, and a center of gravity adjustment hole. This optimizes the structure and assembly of the gas bearing assembly, including the combined use of annular air inlet grooves, radial gas bearings, thrust gas bearings, and wave springs, ensuring efficient sealing, uniform gas film distribution, and rotor center of gravity adjustment.

Benefits of technology

The static and dynamic stiffness of the gas bearings are improved, the rotational accuracy and stability of the spindle are enhanced, and the manufacturing cost is reduced, making it suitable for high-speed, high-precision ultra-precision machining.

✦ Generated by Eureka AI based on patent content.
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Abstract

The application relates to the technical field of ultra-precision machining equipment, in particular to a gas bearing assembly and a gas-floating motorized spindle with the same, which comprises an outer shell and a radial gas bearing arranged in the outer shell, a ring-shaped air inlet groove is arranged on the inner wall of the outer shell and corresponds to the position of the radial gas bearing, a closed air inlet cavity is formed between the ring-shaped air inlet groove and the outer cylindrical surface of the radial gas bearing, a plurality of air inlet holes which are in communication with the air inlet cavity are circumferentially distributed on the outer cylindrical surface of the radial gas bearing, a throttling hole which is in communication with the air inlet hole is arranged on the inner cylindrical surface of the radial gas bearing, and a composite pressure equalizing structure which is in communication with the throttling hole; the composite pressure equalizing structure comprises at least one circumferential pressure equalizing groove and at least one axial pressure equalizing groove, and the circumferential pressure equalizing groove is a discontinuous structure which is discontinuous along the circumferential direction. The radial gas bearing is designed as a two-section type and an intermediate air outlet structure, the composite pressure equalizing groove which is combined with the circumferential discontinuous structure and the axial communication structure optimizes the pressure field distribution, suppresses the radial runout of the spindle rotor, and thus the supporting stiffness and the machining precision are improved.
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