A WEAR PREVENTION DEVICE OF GAS FOIL BEARING IN HIGH-SPEED REVOLUTION AXIS SYSTEM

摘要

A wear prevention device for a gas foil bearing in a high-speed revolution axis system is provided to prevent abrasion of foils such as a top foil and a bumper foil by widening plural blade parts circumferentially using the centrifugal force of a collet. A wear prevention device for a gas foil bearing in a high-speed revolution axis system comprises a rotating shaft(20) having plural blade parts(41) formed at its one end, a collet(40), a sleeve(50), and a bearing housing(31). The collet widens plural blade parts circumferentially by the centrifugal force resulting from high speed rotation. The sleeve limits the displacement of the collet. The bearing housing includes an outer wheel(71) of a rolling bearing, and an inner wheel(72) including a bushing(60). The rolling bearing supports the rotating shaft by mounting the collet on the bushing in a stop of rotation or low speed rotation.