A fuel cell system for propulsion of a vehicle includes a compressor for supplying air to the cathode side of a fuel cell. The compressor has an electric motor, a rotor shaft operatively connected to the motor in order to be driven in rotation thereby. A bearing arrangement supports the rotor shaft rotatably and has an air bearing with a bearing gap. The bearing supports the rotor shaft in the compressor. An encircling air gap forms when a lift-off speed of the rotor shaft is reached/overshot. The compressor has a flow path opening into the bearing gap. The system has an actuatable shut-off element arranged in the flow path between a compressed-air supply and the bearing gap and which is configured to selectively close/open the flow path. A controller is configured to open/close the shut-off element and actuate the electric motor in a mutually dependent manner.

A porous gas bearing is disclosed. The porous gas bearing includes a housing having a fluid inlet and an aperture. A porous surface layer is disposed within the housing surrounding the aperture in a circumferential direction. The porous surface layer includes a plurality of segments arranged in a longitudinal direction of the aperture. The porous surface layer is in fluid communication with the fluid inlet. A damping system includes a plurality of dampers. The plurality of dampers is disposed circumferentially about the aperture. The plurality of dampers is arranged in between a first segment of the plurality of segments of the porous surface layer and a second segment of the plurality of segments of the porous surface layer.

A porous gas bearing is disclosed. The porous gas bearing includes a housing having a fluid inlet and an aperture. A porous surface layer is disposed within the housing surrounding the aperture in a circumferential direction. The porous surface layer is in fluid communication with the fluid inlet. A damping system includes a damping system including a biasing member, the biasing member being disposed in a passageway that extends along the longitudinal direction of the aperture and circumferentially about the aperture, wherein the biasing member is arranged radially outward from the porous surface layer.

A device for air supply of a fuel cell operated with hydrogen, via a compressor of an exhaust gas turbocharger. The compressor is drive-effectively connected to a turbine of the turbocharger that can be driven by an exhaust gas flow of the fuel cell via a shaft and the turbocharger, is drive-effectively connected to a motor via the shaft. The mounting of the shaft of the turbocharger is formed by a gas or air-lubricated mounting.

Provided is a linear compressor including a linear motor having a mover reciprocating with respect to a stator; a piston coupled to the mover to reciprocate; a cylinder into which the piston is slidingly inserted, the cylinder having an inner circumferential surface forming a bearing surface together with an external circumferential surface of the piston, the cylinder forming a compression space together with the piston, and the cylinder having at least one first hole formed through the inner circumferential surface of the cylinder and an outer circumferential surface of the cylinder to guide refrigerant discharged from the compression space to the bearing surface; and a porous member inserted into the outer circumferential surface of the cylinder and configured to cover the first hole, the porous member having multiple micropores smaller than the first hole.

An example embodiment of an air bearing assembly includes a first member and a shaft with a flange configured to rotate with respect to the first member. The first member has a first coating on at least one first surface facing at least one second surface on the flange or the shaft. The first coating includes tungsten carbide, a nonpolymeric self-lubricating coating, or a combination thereof. At least one of the second surfaces has a second coating on a surface facing the first coating.

A rotation system (10) is disclosed having at least one axial gas bearing, containing: a housing (11), a shaft (12) that can be rotated relative to the housing (11), at least one bearing plate (13) attached to the shaft (12), and at least one bearing assembly (14) which supports the bearing plate (13) relative to the housing (11), via an axial gas bearing. The bearing assembly (14) has, from inside to outside, a radially inner region (15) supporting the bearing plate (13), a radially central region (16) and a radially outer region (17) held by the housing (11). The radially inner region (15) contains at least one axial bearing element (19) and at least one retention element (20). The bearing plate (13) is supported by the axial bearing element (19), and the retention element (20) holds the axial bearing element (19) in the axial direction.

A method is provided for operating a fluid conveying device of a motor vehicle having at least one aerodynamic bearing. The method reduces the rotational speed of the aerodynamic bearing to a rest speed, wherein the rest speed is below a lifting speed, in which case the bearing builds up an air film for bearing free of mixed friction, and wherein the rest speed is above a lowering speed, in which case the bearing has reduced the air film such that mixed friction occurs. The fluid conveying device is operated at the rest speed.

A bearing assembly for an engine is disclosed. The bearing assembly includes a first structure, a second structure that is movable relative to the first structure, and a foil membrane disposed between the first structure and the second structure. The foil membrane includes at least one perforation that supplies liquid fuel in a region between the foil membrane and the second structure, where the liquid fuel is combusted by the engine.

A bearing assembly comprising a bearing shell, thrust bearing pads, and journal bearing pads, where the thrust bearing pads and/or the journal bearing pads have through-pad lubricating gas distributors comprising at least one of a porous layer having connected-through porosity, a dense layer having a plurality of at least six orifices defined therethrough, or a porous layer having connected-through porosity having a plurality of at least six orifices defined therethrough.