Radial contained squeeze-film aerostatic bearing

Abstract

The invention discloses a radial contained squeeze-film aerostatic bearing, which comprises a rotating shaft, piezoelectric patches, an inner sleeve, fastening screws and an outer sleeve, wherein the rotating shaft is arranged in the inner sleeve, a piezoelectric transducer is composed of the inner sleeve and the piezoelectric patches, the piezoelectric transducer is composed of three groups of piezoelectric patches which are uniformly distributed on the outer circumference of the inner sleeve, wherein the interval of each group of piezoelectric patches is 120 degree, the outer sleeve is sleeved outside the inner sleeve, the inner sleeve is fastened on the outer sleeve by screws. Each group of piezoelectric patch is composed of at least one sheet, which is pasted along the axial directionor radial direction of the inner sleeve. The present invention has the characteristics of uniform radial force of the rotating shaft, and has the advantages of non-contact, low wear, high precision, simple structure, no required affiliated gas source equipment and the like, and is capable of raising the bearing capacity and the rotation precision of the bearing. The present invention can be widely applied to equipments such as precision machine, instruments and meters, pneumatic suspension positioning equipments and the like.

Description

technical field [0001] The invention belongs to the technical field of bearings, in particular to a gas static pressure bearing, in particular to an ultrasonic suspension extrusion film static pressure bearing. Background technique [0002] Gas lubricated bearings have a series of advantages such as small friction loss, almost no frictional heat at extremely high speeds, no wear, no crawling at extremely low speeds, high motion precision, small vibration, no pollution, and can work stably in special environments. Can be used as bearings for high-speed rotary spindles or ultra-precision spindles. [0003] The ultrasonic static pressure suspension bearing in the prior art generally has a flat, V-shaped or concave output end of the piezoelectric transducer. The disadvantage of this structure is that no matter the output end is flat or concave, the suspended shaft will One side or part of the side is subjected to the extrusion force of the air film, and it is very easy to lose ...

AI Technical Summary

Problems solved by technology

[0003] The ultrasonic static pressure suspension bearing in the prior art generally has a flat, V-shaped or concave output end of the piezoelectric transducer. The disadvantage of this structure is that no matter the output end is flat or concave, the suspended shaft will One side or part of the side bears the extrusion force of the air film, which is very easy to lose balance due to external disturbance, and cannot guarantee the stability and rotation accuracy of the suspension shaft

Images