Provided is a rotor system including: a rotating shaft structure including a shaft and a thrust disc formed in a radial direction of the shaft; at least one journal air bearing including a journal bearing support which is made of a rigid body to support a load applied to the shaft by air, a journal spring which encloses an outer surrounding surface of the journal bearing support to provide a elastic support force to the journal bearing support, and a journal damper which encloses the outer surrounding surface of the journal bearing support to dissipate energy from vibration applied to the journal bearing support; and at least one thrust air bearing including a thrust bearing support which is made of a rigid body to support a load applied to the thrust disc by air, a thrust spring which is positioned on one surface of the thrust bearing support to provide a elastic support force to the thrust bearing support, and a thrust damper which is positioned on one surface of the thrust bearing support to dissipate energy from vibration applied to the thrust bearing support.

A thrust foil bearing (20) includes a foil holder (21) and a plurality of foils (22). Each of the foils (22) includes: a top foil portion (22a); an extending portion (22b); and an underfoil portion (22c). The extending portion (22b) of the each of the foils (22) is arranged behind another of the foils (22) that is adjacent to the each of the foils (22) on the one circumferential side. The underfoil portion (22c) of the each of the foils (22) is arranged between the top foil portion (22a) of the another of the foils (22), which is adjacent to the each of the foils (22) on another circumferential side, and the end surface (21a) of the foil holder (21).

A hybrid dynamic pressure gas thrust bearing, comprises two outer discs, an inner disc clamped between the two outer discs, and foil type elastic parts arranged between each outer disc and the inner disc; and the two end faces of the inner disc are respectively provided with regular groove-type patterns, and the groove-type pattern in one end face is in mirror symmetry with the groove-type pattern in the other end face. The hybrid dynamic pressure gas thrust provided by the invention has the rigidity characteristic of the high-limit rotating speed of the groove-type dynamic pressure gas thrust bearing, and has the flexible characteristic of the high impact resistance and the load capacity of the foil type dynamic pressure gas thrust bearing, it can meet the application of dynamic pressure gas thrust bearings in ultra high-speed areas under larger loads.

An air bearing according to an example of the present disclosure includes a stationary member and a shaft with a flange configured to rotate with respect to the stationary member, and at least one of the flange and the shaft have a tungsten-carbide-based coating. An alternative air bearing and a method of making an air bearing are also disclosed.

A wing foil bearing may include one or more wing or tab foil layers. A tab foil layer may comprise a thin material with a two-dimensional array of tab shapes. A tab shape may be defined by a boundary of material separated from the thin material and having an integral edge and a free edge. Tab shapes may include one or more free-state bends relative to the thin material, forming a two-dimensional array of cantilever wings or tabs. Tab arrays may be one or more of various types or two-dimensional arrays, and a tab foil layer may include additional tab arrays and tabs. One or more tab foil layers may be engaged with a mounting surface layer and a counter-surface layer to form a wing foil bearing. Tab foil layers may be stacked and or nested, including partial nesting and complete nesting.

A process for manufacturing a part provided with a lubricating surface coating (10), in which: a composition is prepared that includes at least one precursor having at least one organic group, the composition is deposited on the part, a heat treatment is carried out, wherein the heat treatment of the coating is carried out at a temperature above 220 C., so as to form a lubricating surface coating (10) formed of an at least partially inorganic solid network incorporating solid carbon in at least one lubricating allotropic form in the dispersed state and trapped within the solid network. A part, such as a foil of a foil bearing (1) obtained by the process, a turbomachine, such as a turbomachine for a fuel cell, including such a part, and an aircraft cabin air-conditioning system including at least one such turbomachine are also described.

Provided is a bearing structure for a turbocharger including a turbine and a compressor provided at both ends of a rotation shaft and supporting the rotation shaft to a housing, including: a first radial bearing of an oil lubrication type provided on the side of the turbine of the rotation shaft; a second radial bearing corresponding to an air bearing provided on the side of the compressor of the rotation shaft; a gas seal portion provided in the periphery of the rotation shaft between the first radial bearing and the turbine; and a thrust bearing corresponding to an air bearing provided on the side of the compressor of the rotation shaft.

According to some embodiments, a hybrid thrust foil bearing is provided. A thrust foil bearing or hybrid thrust foil bearing can comprise a disc-shaped backing plate and a bearing pad attached to the backing plate, the bearing pad having a taper portion and a flat portion, the taper portion extending from a leading edge of the bearing pad to a first angular distance and the flat portion extending from the first angular distance to a trailing edge at a second angular distance. Further, the bearing pad can comprise a bump foil coupled to the plate and a top foil disposed over the bump foil, a first edge of the top foil coupled to the backing plate at the leading edge. Additionally the bearing pad can comprise at least one orifice in the taper portion.

A conical bearing includes a bearing sleeve, a bump foil, and a top foil. The bearing sleeve extends along an axis from a first open end to a second open end. The bearing sleeve has an axially tapered shape such that a first diameter of the bearing sleeve is greater than a second diameter of the bearing sleeve. An interior surface of the bearing sleeve has a non-circular profile. The bump foil is concentrically disposed within the bearing sleeve and includes bump foil pad segments extending circumferentially about the interior surface of the bearing sleeve. Each bump foil pad segment comprises a plurality of foil bumps and the plurality of foil bumps varies in stiffness along a circumference of the bump foil. The top foil is concentrically disposed within the bump foil and includes top foil pad segments extending circumferentially about an interior surface of the bump foil.

A thrust bearing is a thrust bearing disposed facing a thrust collar provided on a rotary shaft and includes a top foil, a back foil and a base plate. The back foil includes a plurality of back foil pieces. The top foil includes a plurality of top foil pieces. In addition, a leading side of the top foil piece in the rotation direction of the rotary shaft is provided with a fixed part fixed to the base plate, an inner circumferential edge side of the top foil piece is provided with an inner circumferential edge-side thin part in which a part is removed from the surface of the top foil piece facing the back foil piece, and the inner circumferential edge-side thin part is formed to be thinner than an outer circumferential edge side of the top foil piece.