Abstract: A press-in nut is formed as a cap nut and has a nut body with a through hole, which is closed by a cap under formation of a blind hole. This is provided to obtain a media-tight connection with the nut body. The nut body has a ring collar at the top. In a pre-assembled state, the ring collar is only at least partially bent over, so that the cap is only held captively, without a media-tight connection being formed. The desired media-tight connection is only formed when press-fitting into a component.

Abstract: A press-fit connection between a high-strength component and a press-fit element is characterized by a non-circular previously made hole into which the press-fit element having a collar is inserted. Here, the collar is merely upset and pressed against a hole rim without embracing an underside of the component. Preferably, the hole rim is widened in a longitudinal direction such that a form-locking connection acting in opposition to the longitudinal direction is formed. The non-circular hole geometry is produced with the aid of a punch of circular cross sectional geometry, in that a cutter of the punch has leading and recessed cutting regions, with the result that disrupted partial regions are formed.

Abstract: A self-punching press-fit element, in particular a punching nut, has a head part with a head bearing for bearing on a component, as well as a punching collar having an end-side cutting edge. An undercut is configured between the punching collar and the head bearing. An encircling displacement web is configured so as to adjoin the punching collar on the head bearing, the encircling displacement web being adjoined in the radial direction by a further external region of the head bearing. The further external region in the longitudinal direction is set back in relation to the displacement web. During the configuration of the press-fit connection, material is press-fitted from the upper side of the component into the undercut by the displacement web. A deformation of the lower side of the component is preferably not performed.

Abstract: A self-punching press-fit element, in particular a punching nut, has a head part with a head bearing for bearing on a component, as well as a punching collar having an end-side cutting edge. An undercut is configured between the punching collar and the head bearing. An encircling displacement web is configured so as to adjoin the punching collar on the head bearing, the encircling displacement web being adjoined in the radial direction by a further external region of the head bearing. The further external region in the longitudinal direction is set back in relation to the displacement web. During the configuration of the press-fit connection, material is press-fitted from the upper side of the component into the undercut by the displacement web. A deformation of the lower side of the component is preferably not performed.

Abstract: A press-fit connection between a high-strength component and a press-fit element is characterized by a non-circular previously made hole into which the press-fit element having a collar is inserted. Here, the collar is merely upset and pressed against a hole rim without embracing an underside of the component. Preferably, the hole rim is widened in a longitudinal direction such that a form-locking connection acting in opposition to the longitudinal direction is formed. The non-circular hole geometry is produced with the aid of a punch of circular cross sectional geometry, in that a cutter of the punch has leading and recessed cutting regions, with the result that disrupted partial regions are formed.

Abstract: The present disclosure relates to a method of operating an aircraft system, in particular for the purpose of fresh air supply, air-conditioning and pressurization of an aircraft cabin, having a first compressed air source formed by a first compressor charged with ambient air, ram air and/or precompressed air and driven by means of at least one motor and/or of at least one turbine and whose outlet is in direct or indirect communication with an aircraft cabin, said aircraft system having at least one second compressed air source whose outlet can be connected directly or indirectly to the aircraft cabin, wherein only the first compressed air source is in communication with the aircraft cabin in a first operating mode, wherein both the first and the second compressed air sources are in communication with the aircraft cabin in a second operating mode, and wherein the selection of the operating mode depends on the pressure of the ambient air such that the first operating mode is set at a high pressure of the ambien

Abstract: The present disclosure relates to a method of operating an aircraft system, in particular for the purpose of fresh air supply, air-conditioning and pressurization of an aircraft cabin, having a first compressed air source formed by a first compressor charged with ambient air, ram air and/or precompressed air and driven by means of at least one motor and/or of at least one turbine and whose outlet is in direct or indirect communication with an aircraft cabin, said aircraft system having at least one second compressed air source whose outlet can be connected directly or indirectly to the aircraft cabin, wherein only the first compressed air source is in communication with the aircraft cabin in a first operating mode, wherein both the first and the second compressed air sources are in communication with the aircraft cabin in a second operating mode, and wherein the selection of the operating mode depends on the pressure of the ambient air such that the first operating mode is set at a high pressure of the ambien