Abstract: A radial foil bearing includes a carrier foil formed from a corrugated foil, a first curved segment formed from a first top foil and a second curved segment formed from a second top foil. The second curved segment is arranged successively on the carrier foil after the first curved segment to form a tubular carrier comprising two curved segments when the carrier foil is rolled. In an embodiment, the carrier foil has a first end and a second end, and, after the carrier foil is rolled to form the tubular carrier, the tubular carrier has a circumferentially closed shape and the first end faces the second end.

Abstract: A radial foil bearing operable in a single rotational direction includes an outer ring and a plurality of foil packs. Each foil pack has a top foil and a corrugated foil arranged radially between the outer ring and the top foil. Each top foil has a first end fixed to the outer ring and a second end, opposite the first end, that is freely movable and overlaps a circumferentially adjacent top foil. A predetermined angular range of the second end is arranged to contact a shaft.

Abstract: A radial foil bearing includes a base foil, a first top foil, a first corrugated foil, a second top foil and a second corrugated foil. The first corrugated foil is arranged radially on top of the first top foil and fixed to the first top foil to form a first curved segment fixed to the base foil and extending in a circumferential direction. The second corrugated foil is arranged radially on top of the second top foil and fixed to the second top foil to form a second curved segment fixed to the base foil and extending in the circumferential direction. The second curved segment is placed after the first curved segment on the base foil so that, when the base foil is rolled up, the first curved segment and the second curved segment form at least a portion of a tubular base.

Abstract: An aircraft fuselage is configured to receive two tanks designed to contain liquid hydrogen. The fuselage includes a first section for a cockpit, a second section for a passenger cabin and a third section (T3) distinct from the first section (T1) and from the second section (T2). The third section (T3) includes two housings each to house a tank. The two housings are arranged symmetrically with respect to a vertical plane of symmetry (P1). This arrangement of the tanks in a section distinct from the other sections allows them to be located as close as possible to the motors that they have to supply.

Abstract: An autonomous propeller propulsion system for an aircraft. The autonomous system comprises a chassis with first attachment systems which engage with second attachment systems of the wing to ensure detachable attachment of the autonomous system, a fuel cell attached to the chassis, an electric motor attached to the chassis and having an output shaft, a propshaft rotated by the output shaft, a propeller attached to the propshaft, a controller converting an electric current delivered by the fuel cells into an electric current delivered to the electric motor, a hydrogen feed duct and an air feed duct, a set of auxiliary equipment, and a first connection arrangement, which connects with a second connection arrangement of the aircraft.

Abstract: An autonomous propeller propulsion system for an aircraft. The autonomous system comprises a chassis with first attachment systems which engage with second attachment systems of the wing to ensure detachable attachment of the autonomous system, a fuel cell attached to the chassis, an electric motor attached to the chassis and having an output shaft, a propshaft rotated by the output shaft, a propeller attached to the propshaft, a controller converting an electric current delivered by the fuel cells into an electric current delivered to the electric motor, a hydrogen feed duct and an air feed duct, a set of auxiliary equipment, and a first connection arrangement, which connects with a second connection arrangement of the aircraft.

Abstract: Rolling bearings and housings for the same are disclosed. The rolling bearing may include an inner ring having a first raceway, an outer ring having a second raceway, having two end faces and an outer lateral surface, and comprising a plurality of rolling bodies. The outer lateral surface of the outer ring may be surrounded by a sleeve, which has at least one lug, pointing away from the outer ring and a first end face of the two end faces, for forming the axial position retention of the rolling bearing in an installed position.

Abstract: Rolling bearings and housings for the same are disclosed. The rolling bearing may include an inner ring having a first raceway, an outer ring having a second raceway, having two end faces and an outer lateral surface, and comprising a plurality of rolling bodies. The outer lateral surface of the outer ring may be surrounded by a sleeve, which has at least one lug, pointing away from the outer ring and a first end face of the two end faces, for forming the axial position retention of the rolling bearing in an installed position.

Abstract: Needle bearing units and gas control valve arrangements including the bearing units are disclosed. A needle bearing unit for mounting a valve shaft or actuator shaft may include an outer ring and a needle cage, which may be arranged in the outer ring. Needle-shaped rolling elements may be guided in the needle cage, and the outer ring may have the form of a sleeve and have a sleeve bottom at its first end. An inner ring may be arranged in the needle cage and have, at its end remote from the sleeve bottom, an inner ring flange pointing toward the outer ring. The outer ring may have, at its second end, a sleeve flange, which surrounds the inner ring flange in order to fix the inner ring in the outer ring.

Abstract: A rolling bearing including an outer ring, an inner ring and two annular, cage-guided rolling body rows, the two rolling body rows being axially pre-stressed by at least one spring element which is disposed therebetween, the two rolling body rows each being pre-stressed against a rim at the end of the outer ring, while the inner ring is axially movable against the restoring force of the spring element.

Abstract: A rolling bearing including an outer ring, an inner ring and two annular, cage-guided rolling body rows, the two rolling body rows being axially pre-stressed by at least one spring element which is disposed therebetween, the two rolling body rows each being pre-stressed against a rim at the end of the outer ring, whilst the inner ring is axially movable against the restoring force of the spring element.

Abstract: A device for selective emergency evacuation of persons from a first level to a second level situated above the first level, or to a third level situated below the first level. For evacuation to the second level a stair arrangement is provided. One end of the device is connected to the first level while the other end is displaceable between the second level and the third level or vice versa. For evacuation to the third level, the device is changeable to a slide. The device may provide for emergency evacuation of persons from a first level deck, or passenger deck of a blended wing-body aircraft, selectively to the top, second level of the aircraft, or to the bottom third level of the aircraft.

Abstract: A method and a device for supporting the take-off rotation of an aircraft, which aircraft comprises on each side of the aircraft at least two main landing gear units, arranged one behind the other, which main landing gear units comprising wheels. For supporting the take-off rotation, in at least one rear pair of the main landing gear units the distance between the wheels of these rear main landing gear units, which wheels roll on the ground, and the fuselage, may actively be reduced.

Abstract: A bearing unit which has a bearing shell with a projection which plastically deforms a bore of an adjacent component, on assembly, to produce a recess, thereby securing the bearing shell against being axially displaced in the direction of a bearing axis and from being twisted in the peripheral direction. The position and anti-twist locking effect is thus achieved by producing a recess in the adjacent component in which recess the projection is accommodated in a positive fit. The bearing unit is preferably used for bearing a starter shaft in a starter of a motor vehicle.

Abstract: A device for selective emergency evacuation of persons from a first level to a second level situated above the first level, or to a third level situated below the first level. For evacuation to the second level a stair arrangement is provided. One end of the device is connected to the first level while the other end is displaceable between the second level and the third level or vice versa. For evacuation to the third level, the device is changeable to a slide. The device may provide for emergency evacuation of persons from a first level deck, or passenger deck of a blended wing-body aircraft, selectively to the top, second level of the aircraft, or to the bottom third level of the aircraft.

Abstract: A method and a device for supporting the take-off rotation of an aircraft, which aircraft comprises on each side of the aircraft at least two main landing gear units, arranged one behind the other, which main landing gear units comprising wheels. For supporting the take-off rotation, in at least one rear pair of the main landing gear units the distance between the wheels of these rear main landing gear units, which wheels roll on the ground, and the fuselage, may actively be reduced.