Gas bearing device

Abstract

A gas bearing device according to one aspect of the present disclosure comprises: a housing which has therein a housing space that houses a rotary shaft and in which a groove portion extending along the axial direction of the rotary shaft is formed in an inner peripheral surface that defines the housing space; a top foil which is provided in an annular gap formed between the inner peripheral surface and the rotary shaft and which has one end portion in the circumferential direction of the rotary shaft inserted in the groove portion; and a backup foil which is provided in the annular gap on the outer side of the top foil so as to surround the top foil, which is configured to elastically support the top foil, and which has one end portion in the circumferential direction of the rotary shaft inserted in the groove portion such that the one end portion is positioned on one side in the groove portion with respect to the one end portion of the top foil. The groove portion includes a pair of side wall surfaces which are disposed so as to face each other and which include one side wall surface positioned on the one side in the groove portion and the other side wall surface positioned on the other side in the groove portion. The gas bearing device further comprises a pressing force application means disposed in the groove portion and configured to press each of the one end portions of the top foil and the backup foil against the other side wall surface.