Radial foil piece gas bearing with windowing type bulged support foil piece

The invention relates to a radial elastic foil piece gas bearing. The novel foil piece gas bearing consists of a bearing bush, an elastic support structure, a top-layer foil piece and the like. The elastic support structure consists of two layers of support foil pieces and a layer of super-plasticity Zn-Al allow foil piece, wherein the Zn-Al allow foil piece is arranged between the two layers of support foil pieces. One ends of the elastic support structure and the top-layer foil piece are welded on the cylindrical surface in the bearing bush, and the other ends of the elastic support structure and the top-layer foil piece are free. Each support foil piece is formed by pressing a metal foil piece with an I-shaped notch. Each pressed support foil piece is provided with symmetrical window-shaped lug bosses opened by a certain angle, and the lug bosses are distributed along the peripheral direction of the bearing. When the radial foil piece gas bearing is designed, the stiffness characteristic of the bearing can be conveniently changed by changing the parameters of the lug boss such as the height h, the inclined angle alpha, the width l, the pitch s and the like. The coulomb friction of a support part can be increased due to the super-plasticity Zn-Al allow foil piece, so that the damp of the foil piece gas bearing can be improved, and the stability of a bearing-rotor system under the critical rotation speed can be improved.